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/*
* xC.c: a terminal-based IRC client
*
* Copyright (c) 2015 - 2022, Přemysl Eric Janouch <p@janouch.name>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
// A table of all attributes we use for output
#define ATTR_TABLE(XX) \
XX( PROMPT, prompt, Terminal attrs for the prompt ) \
XX( DATE_CHANGE, date_change, Terminal attrs for date change ) \
XX( READ_MARKER, read_marker, Terminal attrs for the read marker ) \
XX( WARNING, warning, Terminal attrs for warnings ) \
XX( ERROR, error, Terminal attrs for errors ) \
XX( EXTERNAL, external, Terminal attrs for external lines ) \
XX( TIMESTAMP, timestamp, Terminal attrs for timestamps ) \
XX( HIGHLIGHT, highlight, Terminal attrs for highlights ) \
XX( ACTION, action, Terminal attrs for user actions ) \
XX( USERHOST, userhost, Terminal attrs for user@host ) \
XX( JOIN, join, Terminal attrs for joins ) \
XX( PART, part, Terminal attrs for parts )
enum
{
ATTR_RESET,
#define XX(x, y, z) ATTR_ ## x,
ATTR_TABLE (XX)
#undef XX
ATTR_COUNT
};
// User data for logger functions to enable formatted logging
#define print_fatal_data ((void *) ATTR_ERROR)
#define print_error_data ((void *) ATTR_ERROR)
#define print_warning_data ((void *) ATTR_WARNING)
#include "config.h"
#define PROGRAM_NAME "xC"
// fmemopen
#define _POSIX_C_SOURCE 200809L
#include "common.c"
#include "xD-replies.c"
#include "xC-proto.c"
#include <math.h>
#include <langinfo.h>
#include <locale.h>
#include <pwd.h>
#include <sys/utsname.h>
#include <wchar.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <curses.h>
#include <term.h>
// Literally cancer
#undef lines
#undef columns
#include <ffi.h>
#ifdef HAVE_LUA
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#endif // HAVE_LUA
// --- Terminal information ----------------------------------------------------
static struct
{
bool initialized; ///< Terminal is available
bool stdout_is_tty; ///< `stdout' is a terminal
bool stderr_is_tty; ///< `stderr' is a terminal
struct termios termios; ///< Terminal attributes
char *color_set_fg[256]; ///< Codes to set the foreground colour
char *color_set_bg[256]; ///< Codes to set the background colour
int lines; ///< Number of lines
int columns; ///< Number of columns
}
g_terminal;
static void
update_screen_size (void)
{
#ifdef TIOCGWINSZ
if (!g_terminal.stdout_is_tty)
return;
struct winsize size;
if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size))
{
char *row = getenv ("LINES");
char *col = getenv ("COLUMNS");
unsigned long tmp;
g_terminal.lines =
(row && xstrtoul (&tmp, row, 10)) ? tmp : size.ws_row;
g_terminal.columns =
(col && xstrtoul (&tmp, col, 10)) ? tmp : size.ws_col;
}
#endif // TIOCGWINSZ
}
static bool
init_terminal (void)
{
int tty_fd = -1;
if ((g_terminal.stderr_is_tty = isatty (STDERR_FILENO)))
tty_fd = STDERR_FILENO;
if ((g_terminal.stdout_is_tty = isatty (STDOUT_FILENO)))
tty_fd = STDOUT_FILENO;
int err;
if (tty_fd == -1 || setupterm (NULL, tty_fd, &err) == ERR)
return false;
// Make sure all terminal features used by us are supported
if (!set_a_foreground || !set_a_background
|| !enter_bold_mode || !exit_attribute_mode
|| tcgetattr (tty_fd, &g_terminal.termios))
{
del_curterm (cur_term);
return false;
}
// Make sure newlines are output correctly
g_terminal.termios.c_oflag |= ONLCR;
(void) tcsetattr (tty_fd, TCSADRAIN, &g_terminal.termios);
g_terminal.lines = tigetnum ("lines");
g_terminal.columns = tigetnum ("cols");
update_screen_size ();
int max = MIN (256, max_colors);
for (int i = 0; i < max; i++)
{
g_terminal.color_set_fg[i] = xstrdup (tparm (set_a_foreground,
i, 0, 0, 0, 0, 0, 0, 0, 0));
g_terminal.color_set_bg[i] = xstrdup (tparm (set_a_background,
i, 0, 0, 0, 0, 0, 0, 0, 0));
}
return g_terminal.initialized = true;
}
static void
free_terminal (void)
{
if (!g_terminal.initialized)
return;
for (int i = 0; i < 256; i++)
{
free (g_terminal.color_set_fg[i]);
free (g_terminal.color_set_bg[i]);
}
del_curterm (cur_term);
}
// --- User interface ----------------------------------------------------------
// I'm not sure which one of these backends is worse: whether it's GNU Readline
// or BSD Editline. They both have their own annoying problems. We use lots
// of hacks to get the results we want and need.
//
// The abstraction is a necessary evil. It's still not 100%, though.
/// Some arbitrary limit for the history
#define HISTORY_LIMIT 10000
/// Characters that separate words
#define WORD_BREAKING_CHARS " \f\n\r\t\v"
struct input
{
struct input_vtable *vtable; ///< Virtual methods
void (*add_functions) (void *); ///< Define functions for binding
void *user_data; ///< User data for callbacks
};
typedef void *input_buffer_t; ///< Pointer alias for input buffers
/// Named function that can be bound to a sequence of characters
typedef bool (*input_fn) (int count, int key, void *user_data);
// A little bit better than tons of forwarder functions in our case
#define CALL(self, name) ((self)->vtable->name ((self)))
#define CALL_(self, name, ...) ((self)->vtable->name ((self), __VA_ARGS__))
struct input_vtable
{
/// Start the interface under the given program name
void (*start) (void *input, const char *program_name);
/// Stop the interface
void (*stop) (void *input);
/// Prepare or unprepare terminal for our needs
void (*prepare) (void *input, bool enabled);
/// Destroy the object
void (*destroy) (void *input);
/// Hide the prompt if shown
void (*hide) (void *input);
/// Show the prompt if hidden
void (*show) (void *input);
/// Retrieve current prompt string
const char *(*get_prompt) (void *input);
/// Change the prompt string; takes ownership
void (*set_prompt) (void *input, char *prompt);
/// Ring the terminal bell
void (*ding) (void *input);
/// Create a new input buffer
input_buffer_t (*buffer_new) (void *input);
/// Destroy an input buffer
void (*buffer_destroy) (void *input, input_buffer_t buffer);
/// Switch to a different input buffer
void (*buffer_switch) (void *input, input_buffer_t buffer);
/// Register a function that can be bound to character sequences
void (*register_fn) (void *input,
const char *name, const char *help, input_fn fn, void *user_data);
/// Bind an arbitrary sequence of characters to the given named function
void (*bind) (void *input, const char *seq, const char *fn);
/// Bind Ctrl+key to the given named function
void (*bind_control) (void *input, char key, const char *fn);
/// Bind Alt+key to the given named function
void (*bind_meta) (void *input, char key, const char *fn);
/// Get the current line input and position within
char *(*get_line) (void *input, int *position);
/// Clear the current line input
void (*clear_line) (void *input);
/// Insert text at current position
bool (*insert) (void *input, const char *text);
/// Handle terminal resize
void (*on_tty_resized) (void *input);
/// Handle terminal input
void (*on_tty_readable) (void *input);
};
#define INPUT_VTABLE(XX) \
XX (start) XX (stop) XX (prepare) XX (destroy) \
XX (hide) XX (show) XX (get_prompt) XX (set_prompt) XX (ding) \
XX (buffer_new) XX (buffer_destroy) XX (buffer_switch) \
XX (register_fn) XX (bind) XX (bind_control) XX (bind_meta) \
XX (get_line) XX (clear_line) XX (insert) \
XX (on_tty_resized) XX (on_tty_readable)
// ~~~ GNU Readline ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#ifdef HAVE_READLINE
#include <readline/readline.h>
#include <readline/history.h>
#define INPUT_START_IGNORE RL_PROMPT_START_IGNORE
#define INPUT_END_IGNORE RL_PROMPT_END_IGNORE
struct input_rl_fn
{
ffi_closure closure; ///< Closure
LIST_HEADER (struct input_rl_fn)
input_fn callback; ///< Real callback
void *user_data; ///< Real callback user data
};
struct input_rl_buffer
{
HISTORY_STATE *history; ///< Saved history state
char *saved_line; ///< Saved line content
int saved_point; ///< Saved cursor position
int saved_mark; ///< Saved mark
};
struct input_rl
{
struct input super; ///< Parent class
bool active; ///< Interface has been started
char *prompt; ///< The prompt we use
int prompt_shown; ///< Whether the prompt is shown now
char *saved_line; ///< Saved line content
int saved_point; ///< Saved cursor position
int saved_mark; ///< Saved mark
struct input_rl_fn *fns; ///< Named functions
struct input_rl_buffer *current; ///< Current input buffer
};
static void
input_rl_ding (void *input)
{
(void) input;
rl_ding ();
}
static const char *
input_rl_get_prompt (void *input)
{
struct input_rl *self = input;
return self->prompt;
}
static void
input_rl_set_prompt (void *input, char *prompt)
{
struct input_rl *self = input;
cstr_set (&self->prompt, prompt);
if (!self->active || self->prompt_shown <= 0)
return;
// First reset the prompt to work around a bug in readline
rl_set_prompt ("");
rl_redisplay ();
rl_set_prompt (self->prompt);
rl_redisplay ();
}
static void
input_rl_clear_line (void *input)
{
(void) input;
rl_replace_line ("", false);
rl_redisplay ();
}
static void
input_rl__erase (struct input_rl *self)
{
rl_set_prompt ("");
input_rl_clear_line (self);
}
static bool
input_rl_insert (void *input, const char *s)
{
struct input_rl *self = input;
rl_insert_text (s);
if (self->prompt_shown > 0)
rl_redisplay ();
// GNU Readline, contrary to Editline, doesn't care about validity
return true;
}
static char *
input_rl_get_line (void *input, int *position)
{
(void) input;
if (position) *position = rl_point;
return rl_copy_text (0, rl_end);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_rl_bind (void *input, const char *seq, const char *function_name)
{
(void) input;
rl_bind_keyseq (seq, rl_named_function (function_name));
}
static void
input_rl_bind_meta (void *input, char key, const char *function_name)
{
// This one seems to actually work
char keyseq[] = { '\\', 'e', key, 0 };
input_rl_bind (input, keyseq, function_name);
#if 0
// While this one only fucks up UTF-8
// Tested with urxvt and xterm, on Debian Jessie/Arch, default settings
// \M-<key> behaves exactly the same
rl_bind_key (META (key), rl_named_function (function_name));
#endif
}
static void
input_rl_bind_control (void *input, char key, const char *function_name)
{
char keyseq[] = { '\\', 'C', '-', key, 0 };
input_rl_bind (input, keyseq, function_name);
}
static void
input_rl__forward (ffi_cif *cif, void *ret, void **args, void *user_data)
{
(void) cif;
struct input_rl_fn *data = user_data;
if (!data->callback
(*(int *) args[0], UNMETA (*(int *) args[1]), data->user_data))
rl_ding ();
*(int *) ret = 0;
}
static void
input_rl_register_fn (void *input,
const char *name, const char *help, input_fn callback, void *user_data)
{
struct input_rl *self = input;
(void) help;
void *bound_fn = NULL;
struct input_rl_fn *data = ffi_closure_alloc (sizeof *data, &bound_fn);
hard_assert (data);
static ffi_cif cif;
static ffi_type *args[2] = { &ffi_type_sint, &ffi_type_sint };
hard_assert (ffi_prep_cif
(&cif, FFI_DEFAULT_ABI, 2, &ffi_type_sint, args) == FFI_OK);
data->prev = data->next = NULL;
data->callback = callback;
data->user_data = user_data;
hard_assert (ffi_prep_closure_loc (&data->closure,
&cif, input_rl__forward, data, bound_fn) == FFI_OK);
rl_add_defun (name, (rl_command_func_t *) bound_fn, -1);
LIST_PREPEND (self->fns, data);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int app_readline_init (void);
static void on_readline_input (char *line);
static char **app_readline_completion (const char *text, int start, int end);
static void
input_rl_start (void *input, const char *program_name)
{
struct input_rl *self = input;
using_history ();
// This can cause memory leaks, or maybe even a segfault. Funny, eh?
stifle_history (HISTORY_LIMIT);
const char *slash = strrchr (program_name, '/');
rl_readline_name = slash ? ++slash : program_name;
rl_startup_hook = app_readline_init;
rl_catch_sigwinch = false;
rl_change_environment = false;
rl_basic_word_break_characters = WORD_BREAKING_CHARS;
rl_completer_word_break_characters = NULL;
rl_attempted_completion_function = app_readline_completion;
// We shouldn't produce any duplicates that the library would help us
// autofilter, and we don't generally want alphabetic ordering at all
rl_sort_completion_matches = false;
hard_assert (self->prompt != NULL);
// The inputrc is read before any callbacks are called, so we need to
// register all functions that our user may want to map up front
self->super.add_functions (self->super.user_data);
rl_callback_handler_install (self->prompt, on_readline_input);
self->prompt_shown = 1;
self->active = true;
}
static void
input_rl_stop (void *input)
{
struct input_rl *self = input;
if (self->prompt_shown > 0)
input_rl__erase (self);
// This is okay as long as we're not called from within readline
rl_callback_handler_remove ();
self->active = false;
self->prompt_shown = false;
}
static void
input_rl_prepare (void *input, bool enabled)
{
(void) input;
if (enabled)
rl_prep_terminal (true);
else
rl_deprep_terminal ();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// The following part shows you why it's not a good idea to use
// GNU Readline for this kind of software. Or for anything else, really.
static void
input_rl__save_buffer (struct input_rl *self, struct input_rl_buffer *buffer)
{
(void) self;
buffer->history = history_get_history_state ();
buffer->saved_line = rl_copy_text (0, rl_end);
buffer->saved_point = rl_point;
buffer->saved_mark = rl_mark;
rl_replace_line ("", true);
if (self->prompt_shown > 0)
rl_redisplay ();
}
static void
input_rl__restore_buffer (struct input_rl *self, struct input_rl_buffer *buffer)
{
if (buffer->history)
{
// history_get_history_state() just allocates a new HISTORY_STATE
// and fills it with its current internal data. We don't need that
// shell anymore after reviving it.
history_set_history_state (buffer->history);
free (buffer->history);
buffer->history = NULL;
}
else
{
// This should get us a clean history while keeping the flags.
// Note that we've either saved the previous history entries, or we've
// cleared them altogether, so there should be nothing to leak.
HISTORY_STATE *state = history_get_history_state ();
state->offset = state->length = state->size = 0;
state->entries = NULL;
history_set_history_state (state);
free (state);
}
if (buffer->saved_line)
{
rl_replace_line (buffer->saved_line, true);
rl_point = buffer->saved_point;
rl_mark = buffer->saved_mark;
cstr_set (&buffer->saved_line, NULL);
if (self->prompt_shown > 0)
rl_redisplay ();
}
}
static void
input_rl_buffer_switch (void *input, input_buffer_t input_buffer)
{
struct input_rl *self = input;
struct input_rl_buffer *buffer = input_buffer;
// There could possibly be occurences of the current undo list in some
// history entry. We either need to free the undo list, or move it
// somewhere else to load back later, as the buffer we're switching to
// has its own history state.
rl_free_undo_list ();
// Save this buffer's history so that it's independent for each buffer
if (self->current)
input_rl__save_buffer (self, self->current);
else
// Just throw it away; there should always be an active buffer however
#if RL_READLINE_VERSION >= 0x0603
rl_clear_history ();
#else // RL_READLINE_VERSION < 0x0603
// At least something... this may leak undo entries
clear_history ();
#endif // RL_READLINE_VERSION < 0x0603
input_rl__restore_buffer (self, buffer);
self->current = buffer;
}
static void
input_rl__buffer_destroy_wo_history (struct input_rl_buffer *self)
{
free (self->history);
free (self->saved_line);
free (self);
}
static void
input_rl_buffer_destroy (void *input, input_buffer_t input_buffer)
{
(void) input;
struct input_rl_buffer *buffer = input_buffer;
// rl_clear_history, being the only way I know of to get rid of the complete
// history including attached data, is a pretty recent addition. *sigh*
#if RL_READLINE_VERSION >= 0x0603
if (buffer->history)
{
// See input_rl_buffer_switch() for why we need to do this BS
rl_free_undo_list ();
// This is probably the only way we can free the history fully
HISTORY_STATE *state = history_get_history_state ();
history_set_history_state (buffer->history);
rl_clear_history ();
// rl_clear_history just removes history entries,
// we have to reclaim memory for their actual container ourselves
free (buffer->history->entries);
free (buffer->history);
buffer->history = NULL;
history_set_history_state (state);
free (state);
}
#endif // RL_READLINE_VERSION
input_rl__buffer_destroy_wo_history (buffer);
}
static input_buffer_t
input_rl_buffer_new (void *input)
{
(void) input;
struct input_rl_buffer *self = xcalloc (1, sizeof *self);
return self;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Since {save,restore}_buffer() store history, we can't use them here like we
// do with libedit, because then buffer_destroy() can free memory that's still
// being used by readline. This situation is bound to happen on quit.
static void
input_rl__save (struct input_rl *self)
{
hard_assert (!self->saved_line);
self->saved_point = rl_point;
self->saved_mark = rl_mark;
self->saved_line = rl_copy_text (0, rl_end);
}
static void
input_rl__restore (struct input_rl *self)
{
hard_assert (self->saved_line);
rl_set_prompt (self->prompt);
rl_replace_line (self->saved_line, false);
rl_point = self->saved_point;
rl_mark = self->saved_mark;
cstr_set (&self->saved_line, NULL);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_rl_hide (void *input)
{
struct input_rl *self = input;
if (!self->active || self->prompt_shown-- < 1)
return;
input_rl__save (self);
input_rl__erase (self);
}
static void
input_rl_show (void *input)
{
struct input_rl *self = input;
if (!self->active || ++self->prompt_shown < 1)
return;
input_rl__restore (self);
rl_redisplay ();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_rl_on_tty_resized (void *input)
{
(void) input;
// This fucks up big time on terminals with automatic wrapping such as
// rxvt-unicode or newer VTE when the current line overflows, however we
// can't do much about that
rl_resize_terminal ();
}
static void
input_rl_on_tty_readable (void *input)
{
(void) input;
rl_callback_read_char ();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_rl_destroy (void *input)
{
struct input_rl *self = input;
free (self->saved_line);
LIST_FOR_EACH (struct input_rl_fn, iter, self->fns)
ffi_closure_free (iter);
free (self->prompt);
free (self);
}
#define XX(a) .a = input_rl_ ## a,
static struct input_vtable input_rl_vtable = { INPUT_VTABLE (XX) };
#undef XX
static struct input *
input_rl_new (void)
{
struct input_rl *self = xcalloc (1, sizeof *self);
self->super.vtable = &input_rl_vtable;
return &self->super;
}
#define input_new input_rl_new
#endif // HAVE_READLINE
// ~~~ BSD Editline ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#ifdef HAVE_EDITLINE
#include <histedit.h>
#define INPUT_START_IGNORE '\x01'
#define INPUT_END_IGNORE '\x01'
struct input_el_fn
{
ffi_closure closure; ///< Closure
LIST_HEADER (struct input_el_fn)
input_fn callback; ///< Real callback
void *user_data; ///< Real callback user data
wchar_t *name; ///< Function name
wchar_t *help; ///< Function help
};
struct input_el_buffer
{
HistoryW *history; ///< The history object
wchar_t *saved_line; ///< Saved line content
int saved_len; ///< Length of the saved line
int saved_point; ///< Saved cursor position
};
struct input_el
{
struct input super; ///< Parent class
EditLine *editline; ///< The EditLine object
bool active; ///< Are we a thing?
char *prompt; ///< The prompt we use
int prompt_shown; ///< Whether the prompt is shown now
struct input_el_fn *fns; ///< Named functions
struct input_el_buffer *current; ///< Current input buffer
};
static void app_editline_init (struct input_el *self);
static void
input_el__redisplay (void *input)
{
// See rl_redisplay(), however NetBSD editline's map.c v1.54 breaks VREPRINT
// so we bind redisplay somewhere else in app_editline_init()
struct input_el *self = input;
wchar_t x[] = { L'q' & 31, 0 };
el_wpush (self->editline, x);
// We have to do this or it gets stuck and nothing is done
int dummy_count = 0;
(void) el_wgets (self->editline, &dummy_count);
}
static char *
input_el__make_prompt (EditLine *editline)
{
struct input_el *self = NULL;
el_get (editline, EL_CLIENTDATA, &self);
if (!self->prompt)
return "";
return self->prompt;
}
static char *
input_el__make_empty_prompt (EditLine *editline)
{
(void) editline;
return "";
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_el_ding (void *input)
{
// XXX: this isn't probably very portable;
// we could use "bell" from terminfo but that creates a dependency
(void) input;
write (STDOUT_FILENO, "\a", 1);
}
static const char *
input_el_get_prompt (void *input)
{
struct input_el *self = input;
return self->prompt;
}
static void
input_el_set_prompt (void *input, char *prompt)
{
struct input_el *self = input;
cstr_set (&self->prompt, prompt);
if (self->prompt_shown > 0)
input_el__redisplay (self);
}
static void
input_el_clear_line (void *input)
{
struct input_el *self = input;
const LineInfoW *info = el_wline (self->editline);
int len = info->lastchar - info->buffer;
int point = info->cursor - info->buffer;
el_cursor (self->editline, len - point);
el_wdeletestr (self->editline, len);
input_el__redisplay (self);
}
static void
input_el__erase (struct input_el *self)
{
el_set (self->editline, EL_PROMPT, input_el__make_empty_prompt);
input_el_clear_line (self);
}
static bool
input_el_insert (void *input, const char *s)
{
struct input_el *self = input;
bool success = !*s || !el_insertstr (self->editline, s);
if (self->prompt_shown > 0)
input_el__redisplay (self);
return success;
}
static char *
input_el_get_line (void *input, int *position)
{
struct input_el *self = input;
const LineInfo *info = el_line (self->editline);
int point = info->cursor - info->buffer;
if (position) *position = point;
return xstrndup (info->buffer, info->lastchar - info->buffer);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_el_bind (void *input, const char *seq, const char *function_name)
{
struct input_el *self = input;
el_set (self->editline, EL_BIND, seq, function_name, NULL);
}
static void
input_el_bind_meta (void *input, char key, const char *function_name)
{
char keyseq[] = { 'M', '-', key, 0 };
input_el_bind (input, keyseq, function_name);
}
static void
input_el_bind_control (void *input, char key, const char *function_name)
{
char keyseq[] = { '^', key, 0 };
input_el_bind (input, keyseq, function_name);
}
static void
input_el__forward (ffi_cif *cif, void *ret, void **args, void *user_data)
{
(void) cif;
struct input_el_fn *data = user_data;
*(unsigned char *) ret = data->callback
(1, *(int *) args[1], data->user_data) ? CC_NORM : CC_ERROR;
}
static wchar_t *
ascii_to_wide (const char *ascii)
{
size_t len = strlen (ascii) + 1;
wchar_t *wide = xcalloc (sizeof *wide, len);
while (len--)
hard_assert ((wide[len] = (unsigned char) ascii[len]) < 0x80);
return wide;
}
static void
input_el_register_fn (void *input,
const char *name, const char *help, input_fn callback, void *user_data)
{
void *bound_fn = NULL;
struct input_el_fn *data = ffi_closure_alloc (sizeof *data, &bound_fn);
hard_assert (data);
static ffi_cif cif;
static ffi_type *args[2] = { &ffi_type_pointer, &ffi_type_sint };
hard_assert (ffi_prep_cif
(&cif, FFI_DEFAULT_ABI, 2, &ffi_type_uchar, args) == FFI_OK);
data->user_data = user_data;
data->callback = callback;
data->name = ascii_to_wide (name);
data->help = ascii_to_wide (help);
hard_assert (ffi_prep_closure_loc (&data->closure,
&cif, input_el__forward, data, bound_fn) == FFI_OK);
struct input_el *self = input;
el_wset (self->editline, EL_ADDFN, data->name, data->help, bound_fn);
LIST_PREPEND (self->fns, data);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_el_start (void *input, const char *program_name)
{
struct input_el *self = input;
self->editline = el_init (program_name, stdin, stdout, stderr);
el_set (self->editline, EL_CLIENTDATA, self);
el_set (self->editline, EL_PROMPT_ESC,
input_el__make_prompt, INPUT_START_IGNORE);
el_set (self->editline, EL_SIGNAL, false);
el_set (self->editline, EL_UNBUFFERED, true);
el_set (self->editline, EL_EDITOR, "emacs");
app_editline_init (self);
self->prompt_shown = 1;
self->active = true;
}
static void
input_el_stop (void *input)
{
struct input_el *self = input;
if (self->prompt_shown > 0)
input_el__erase (self);
el_end (self->editline);
self->editline = NULL;
self->active = false;
self->prompt_shown = false;
}
static void
input_el_prepare (void *input, bool enabled)
{
struct input_el *self = input;
el_set (self->editline, EL_PREP_TERM, enabled);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_el__save_buffer (struct input_el *self, struct input_el_buffer *buffer)
{
const LineInfoW *info = el_wline (self->editline);
int len = info->lastchar - info->buffer;
int point = info->cursor - info->buffer;
wchar_t *line = calloc (sizeof *info->buffer, len + 1);
memcpy (line, info->buffer, sizeof *info->buffer * len);
el_cursor (self->editline, len - point);
el_wdeletestr (self->editline, len);
buffer->saved_line = line;
buffer->saved_point = point;
buffer->saved_len = len;
}
static void
input_el__save (struct input_el *self)
{
if (self->current)
input_el__save_buffer (self, self->current);
}
static void
input_el__restore_buffer (struct input_el *self, struct input_el_buffer *buffer)
{
if (buffer->saved_line)
{
el_winsertstr (self->editline, buffer->saved_line);
el_cursor (self->editline,
-(buffer->saved_len - buffer->saved_point));
free (buffer->saved_line);
buffer->saved_line = NULL;
}
}
static void
input_el__restore (struct input_el *self)
{
if (self->current)
input_el__restore_buffer (self, self->current);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Editline keeping its own history position (look for "eventno" there).
// This is the only sane way of resetting it.
static void
input_el__start_over (struct input_el *self)
{
wchar_t x[] = { L'c' & 31, 0 };
el_wpush (self->editline, x);
int dummy_count = 0;
(void) el_wgets (self->editline, &dummy_count);
}
static void
input_el_buffer_switch (void *input, input_buffer_t input_buffer)
{
struct input_el *self = input;
struct input_el_buffer *buffer = input_buffer;
if (!self->active)
return;
if (self->current)
input_el__save_buffer (self, self->current);
self->current = buffer;
el_wset (self->editline, EL_HIST, history, buffer->history);
input_el__start_over (self);
input_el__restore_buffer (self, buffer);
}
static void
input_el_buffer_destroy (void *input, input_buffer_t input_buffer)
{
struct input_el *self = input;
struct input_el_buffer *buffer = input_buffer;
if (self->active && self->current == buffer)
{
el_wset (self->editline, EL_HIST, history, NULL);
self->current = NULL;
}
history_wend (buffer->history);
free (buffer->saved_line);
free (buffer);
}
static input_buffer_t
input_el_buffer_new (void *input)
{
(void) input;
struct input_el_buffer *self = xcalloc (1, sizeof *self);
self->history = history_winit ();
HistEventW ev;
history_w (self->history, &ev, H_SETSIZE, HISTORY_LIMIT);
return self;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_el_hide (void *input)
{
struct input_el *self = input;
if (!self->active || self->prompt_shown-- < 1)
return;
input_el__save (self);
input_el__erase (self);
}
static void
input_el_show (void *input)
{
struct input_el *self = input;
if (!self->active || ++self->prompt_shown < 1)
return;
input_el__restore (self);
el_set (self->editline,
EL_PROMPT_ESC, input_el__make_prompt, INPUT_START_IGNORE);
input_el__redisplay (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_el_on_tty_resized (void *input)
{
struct input_el *self = input;
el_resize (self->editline);
}
static void
input_el_on_tty_readable (void *input)
{
// We bind the return key to process it how we need to
struct input_el *self = input;
// el_gets() with EL_UNBUFFERED doesn't work with UTF-8,
// we must use the wide-character interface
int count = 0;
const wchar_t *buf = el_wgets (self->editline, &count);
if (!buf || count-- <= 0)
return;
if (count == 0 && buf[0] == ('D' - 0x40) /* hardcoded VEOF in el_wgets() */)
{
el_deletestr (self->editline, 1);
input_el__redisplay (self);
input_el_ding (self);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
input_el_destroy (void *input)
{
struct input_el *self = input;
LIST_FOR_EACH (struct input_el_fn, iter, self->fns)
{
free (iter->name);
free (iter->help);
ffi_closure_free (iter);
}
free (self->prompt);
free (self);
}
#define XX(a) .a = input_el_ ## a,
static struct input_vtable input_el_vtable = { INPUT_VTABLE (XX) };
#undef XX
static struct input *
input_el_new (void)
{
struct input_el *self = xcalloc (1, sizeof *self);
self->super.vtable = &input_el_vtable;
return &self->super;
}
#define input_new input_el_new
#endif // HAVE_EDITLINE
// --- Application data --------------------------------------------------------
// All text stored in our data structures is encoded in UTF-8. Or at least
// should be--our only ways of retrieving strings are: via the command line
// (converted from locale, no room for errors), via the configuration file
// (restrictive ASCII grammar for bare words and an internal check for strings),
// and via plugins (meticulously validated).
//
// The only exception is IRC identifiers.
// ~~~ Scripting support ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// We need a few reference countable objects with support for both strong
// and weak references (mainly used for scripted plugins).
//
// Beware that if you don't own the object, you will most probably want
// to keep the weak reference link so that you can get rid of it later.
// Also note that you have to make sure the user_data don't leak resources.
//
// Having a callback is more versatile than just nulling out a pointer.
/// Callback just before a reference counted object is destroyed
typedef void (*destroy_cb_fn) (void *object, void *user_data);
struct weak_ref_link
{
LIST_HEADER (struct weak_ref_link)
destroy_cb_fn on_destroy; ///< Called when object is destroyed
void *user_data; ///< User data
};
static struct weak_ref_link *
weak_ref (struct weak_ref_link **list, destroy_cb_fn cb, void *user_data)
{
struct weak_ref_link *link = xcalloc (1, sizeof *link);
link->on_destroy = cb;
link->user_data = user_data;
LIST_PREPEND (*list, link);
return link;
}
static void
weak_unref (struct weak_ref_link **list, struct weak_ref_link **link)
{
if (*link)
LIST_UNLINK (*list, *link);
free (*link);
*link = NULL;
}
#define REF_COUNTABLE_HEADER \
size_t ref_count; /**< Reference count */ \
struct weak_ref_link *weak_refs; /**< To remove any weak references */
#define REF_COUNTABLE_METHODS(name) \
static struct name * \
name ## _ref (struct name *self) \
{ \
self->ref_count++; \
return self; \
} \
\
static void \
name ## _unref (struct name *self) \
{ \
if (--self->ref_count) \
return; \
LIST_FOR_EACH (struct weak_ref_link, iter, self->weak_refs) \
{ \
iter->on_destroy (self, iter->user_data); \
free (iter); \
} \
name ## _destroy (self); \
} \
\
static struct weak_ref_link * \
name ## _weak_ref (struct name *self, destroy_cb_fn cb, void *user_data) \
{ return weak_ref (&self->weak_refs, cb, user_data); } \
\
static void \
name ## _weak_unref (struct name *self, struct weak_ref_link **link) \
{ weak_unref (&self->weak_refs, link); }
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Simple introspection framework to simplify exporting stuff to Lua, since
// there is a lot of it. While not fully automated, at least we have control
// over which fields are exported.
enum ispect_type
{
ISPECT_BOOL, ISPECT_INT, ISPECT_UINT, ISPECT_SIZE, ISPECT_STRING,
ISPECT_STR, ///< "struct str"
ISPECT_STR_MAP, ///< "struct str_map"
ISPECT_REF ///< Weakly referenced object
};
struct ispect_field
{
const char *name; ///< Name of the field
size_t offset; ///< Offset in the structure
enum ispect_type type; ///< Type of the field
enum ispect_type subtype; ///< STR_MAP subtype
struct ispect_field *fields; ///< REF target fields
bool is_list; ///< REF target is a list
};
#define ISPECT(object, field, type) \
{ #field, offsetof (struct object, field), ISPECT_##type, 0, NULL, false },
#define ISPECT_REF(object, field, is_list, ref_type) \
{ #field, offsetof (struct object, field), ISPECT_REF, 0, \
g_##ref_type##_ispect, is_list },
#define ISPECT_MAP(object, field, subtype) \
{ #field, offsetof (struct object, field), ISPECT_STR_MAP, \
ISPECT_##subtype, NULL, false },
#define ISPECT_MAP_REF(object, field, is_list, ref_type) \
{ #field, offsetof (struct object, field), ISPECT_STR_MAP, \
ISPECT_REF, g_##ref_type##_ispect, is_list },
// ~~~ Chat ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
struct user_channel
{
LIST_HEADER (struct user_channel)
struct channel *channel; ///< Reference to channel
};
static struct user_channel *
user_channel_new (struct channel *channel)
{
struct user_channel *self = xcalloc (1, sizeof *self);
self->channel = channel;
return self;
}
static void
user_channel_destroy (struct user_channel *self)
{
// The "channel" reference is weak and this object should get
// destroyed whenever the user stops being in the channel.
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// We keep references to user information in channels and buffers,
// and weak references in the name lookup table.
struct user
{
REF_COUNTABLE_HEADER
char *nickname; ///< Literal nickname
bool away; ///< User is away
struct user_channel *channels; ///< Channels the user is on (with us)
};
static struct ispect_field g_user_ispect[] =
{
ISPECT( user, nickname, STRING )
ISPECT( user, away, BOOL )
{}
};
static struct user *
user_new (char *nickname)
{
struct user *self = xcalloc (1, sizeof *self);
self->ref_count = 1;
self->nickname = nickname;
return self;
}
static void
user_destroy (struct user *self)
{
free (self->nickname);
LIST_FOR_EACH (struct user_channel, iter, self->channels)
user_channel_destroy (iter);
free (self);
}
REF_COUNTABLE_METHODS (user)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct channel_user
{
LIST_HEADER (struct channel_user)
struct user *user; ///< Reference to user
char *prefixes; ///< Ordered @+... characters
};
static struct channel_user *
channel_user_new (struct user *user, const char *prefixes)
{
struct channel_user *self = xcalloc (1, sizeof *self);
self->user = user;
self->prefixes = xstrdup (prefixes);
return self;
}
static void
channel_user_destroy (struct channel_user *self)
{
user_unref (self->user);
free (self->prefixes);
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// We keep references to channels in their buffers,
// and weak references in their users and the name lookup table.
struct channel
{
REF_COUNTABLE_HEADER
struct server *s; ///< Server
char *name; ///< Channel name
char *topic; ///< Channel topic
// XXX: write something like an ordered set of characters object?
struct str no_param_modes; ///< No parameter channel modes
struct str_map param_modes; ///< Parametrized channel modes
struct channel_user *users; ///< Channel users
struct strv names_buf; ///< Buffer for RPL_NAMREPLY
size_t users_len; ///< User count
bool left_manually; ///< Don't rejoin on reconnect
bool show_names_after_who; ///< RPL_ENDOFWHO delays RPL_ENDOFNAMES
};
static struct ispect_field g_channel_ispect[] =
{
ISPECT( channel, name, STRING )
ISPECT( channel, topic, STRING )
ISPECT( channel, no_param_modes, STR )
ISPECT_MAP( channel, param_modes, STRING )
ISPECT( channel, users_len, SIZE )
ISPECT( channel, left_manually, BOOL )
{}
};
static struct channel *
channel_new (struct server *s, char *name)
{
struct channel *self = xcalloc (1, sizeof *self);
self->ref_count = 1;
self->s = s;
self->name = name;
self->no_param_modes = str_make ();
self->param_modes = str_map_make (free);
self->names_buf = strv_make ();
return self;
}
static void
channel_destroy (struct channel *self)
{
free (self->name);
free (self->topic);
str_free (&self->no_param_modes);
str_map_free (&self->param_modes);
// Owner has to make sure we have no users by now
hard_assert (!self->users && !self->users_len);
strv_free (&self->names_buf);
free (self);
}
REF_COUNTABLE_METHODS (channel)
// ~~~ Attribute utilities ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
enum
{
TEXT_BOLD = 1 << 0,
TEXT_ITALIC = 1 << 1,
TEXT_UNDERLINE = 1 << 2,
TEXT_INVERSE = 1 << 3,
TEXT_BLINK = 1 << 4,
TEXT_CROSSED_OUT = 1 << 5,
TEXT_MONOSPACE = 1 << 6
};
// Similar to code in liberty-tui.c.
struct attrs
{
short fg; ///< Foreground (256-colour cube or -1)
short bg; ///< Background (256-colour cube or -1)
unsigned attrs; ///< TEXT_* mask
};
/// Decode attributes in the value using a subset of the git config format,
/// ignoring all errors since it doesn't affect functionality
static struct attrs
attrs_decode (const char *value)
{
struct strv v = strv_make ();
cstr_split (value, " ", true, &v);
int colors = 0;
struct attrs attrs = { -1, -1, 0 };
for (char **it = v.vector; *it; it++)
{
char *end = NULL;
long n = strtol (*it, &end, 10);
if (*it != end && !*end && n >= SHRT_MIN && n <= SHRT_MAX)
{
if (colors == 0) attrs.fg = n;
if (colors == 1) attrs.bg = n;
colors++;
}
else if (!strcmp (*it, "bold")) attrs.attrs |= TEXT_BOLD;
else if (!strcmp (*it, "italic")) attrs.attrs |= TEXT_ITALIC;
else if (!strcmp (*it, "ul")) attrs.attrs |= TEXT_UNDERLINE;
else if (!strcmp (*it, "reverse")) attrs.attrs |= TEXT_INVERSE;
else if (!strcmp (*it, "blink")) attrs.attrs |= TEXT_BLINK;
else if (!strcmp (*it, "strike")) attrs.attrs |= TEXT_CROSSED_OUT;
}
strv_free (&v);
return attrs;
}
// ~~~ Buffers ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
enum formatter_item_type
{
FORMATTER_ITEM_END, ///< Sentinel value for arrays
FORMATTER_ITEM_TEXT, ///< Text
FORMATTER_ITEM_ATTR, ///< Formatting attributes
FORMATTER_ITEM_FG_COLOR, ///< Foreground colour
FORMATTER_ITEM_BG_COLOR, ///< Background colour
FORMATTER_ITEM_SIMPLE, ///< Toggle IRC formatting
FORMATTER_ITEM_IGNORE_ATTR ///< Un/set attribute ignoration
};
struct formatter_item
{
enum formatter_item_type type : 16; ///< Type of this item
int attribute : 16; ///< Attribute ID or a TEXT_* mask
int color; ///< Colour ([256 << 16] | 16)
char *text; ///< String
};
static void
formatter_item_free (struct formatter_item *self)
{
free (self->text);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct formatter
{
struct app_context *ctx; ///< Application context
struct server *s; ///< Server
bool clean; ///< Assume ATTR_RESET
struct formatter_item *items; ///< Items
size_t items_len; ///< Items used
size_t items_alloc; ///< Items allocated
};
static struct formatter
formatter_make (struct app_context *ctx, struct server *s)
{
struct formatter self = { .ctx = ctx, .s = s, .clean = true };
self.items = xcalloc (sizeof *self.items, (self.items_alloc = 16));
return self;
}
static void
formatter_free (struct formatter *self)
{
for (size_t i = 0; i < self->items_len; i++)
formatter_item_free (&self->items[i]);
free (self->items);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
enum buffer_line_flags
{
BUFFER_LINE_SKIP_FILE = 1 << 0, ///< Don't log this to file
BUFFER_LINE_UNIMPORTANT = 1 << 1, ///< Joins, parts, similar spam
BUFFER_LINE_HIGHLIGHT = 1 << 2, ///< The user was highlighted by this
};
// NOTE: This sequence must match up with xC-proto, only one lower.
enum buffer_line_rendition
{
BUFFER_LINE_BARE, ///< Unadorned
BUFFER_LINE_INDENT, ///< Just indent the line
BUFFER_LINE_STATUS, ///< Status message
BUFFER_LINE_ERROR, ///< Error message
BUFFER_LINE_JOIN, ///< Join arrow
BUFFER_LINE_PART, ///< Part arrow
BUFFER_LINE_ACTION, ///< Highlighted asterisk
};
struct buffer_line
{
LIST_HEADER (struct buffer_line)
unsigned flags; ///< Functional flags
enum buffer_line_rendition r; ///< What the line should look like
time_t when; ///< Time of the event
struct formatter_item items[]; ///< Line data
};
/// Create a new buffer line stealing all data from the provided formatter
struct buffer_line *
buffer_line_new (struct formatter *f)
{
// We make space for one more item that gets initialized to all zeros,
// meaning FORMATTER_ITEM_END (because it's the first value in the enum)
size_t items_size = f->items_len * sizeof *f->items;
struct buffer_line *self =
xcalloc (1, sizeof *self + items_size + sizeof *self->items);
memcpy (self->items, f->items, items_size);
// We've stolen pointers from the formatter, let's destroy it altogether
free (f->items);
memset (f, 0, sizeof *f);
return self;
}
static void
buffer_line_destroy (struct buffer_line *self)
{
for (struct formatter_item *iter = self->items; iter->type; iter++)
formatter_item_free (iter);
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
enum buffer_type
{
BUFFER_GLOBAL, ///< Global information
BUFFER_SERVER, ///< Server-related messages
BUFFER_CHANNEL, ///< Channels
BUFFER_PM ///< Private messages (query)
};
struct buffer
{
LIST_HEADER (struct buffer)
REF_COUNTABLE_HEADER
enum buffer_type type; ///< Type of the buffer
char *name; ///< The name of the buffer
struct input *input; ///< API for "input_data"
input_buffer_t input_data; ///< User interface data
// Buffer contents:
struct buffer_line *lines; ///< All lines in this buffer
struct buffer_line *lines_tail; ///< The tail of buffer lines
unsigned lines_count; ///< How many lines we have
unsigned new_messages_count; ///< # messages since last left
unsigned new_unimportant_count; ///< How much of that is unimportant
bool highlighted; ///< We've been highlighted
bool hide_unimportant; ///< Hide unimportant messages
FILE *log_file; ///< Log file
// Origin information:
struct server *server; ///< Reference to server
struct channel *channel; ///< Reference to channel
struct user *user; ///< Reference to user
};
static struct ispect_field g_server_ispect[];
static struct ispect_field g_buffer_ispect[] =
{
ISPECT( buffer, name, STRING )
ISPECT( buffer, new_messages_count, UINT )
ISPECT( buffer, new_unimportant_count, UINT )
ISPECT( buffer, highlighted, BOOL )
ISPECT( buffer, hide_unimportant, BOOL )
ISPECT_REF( buffer, server, false, server )
ISPECT_REF( buffer, channel, false, channel )
ISPECT_REF( buffer, user, false, user )
{}
};
static struct buffer *
buffer_new (struct input *input, enum buffer_type type, char *name)
{
struct buffer *self = xcalloc (1, sizeof *self);
self->ref_count = 1;
self->input = input;
self->input_data = CALL (input, buffer_new);
self->type = type;
self->name = name;
return self;
}
static void
buffer_destroy (struct buffer *self)
{
free (self->name);
if (self->input_data)
{
#ifdef HAVE_READLINE
// FIXME: can't really free "history" contents from here, as we cannot
// be sure that the user interface pointer is valid and usable
input_rl__buffer_destroy_wo_history (self->input_data);
#else // ! HAVE_READLINE
CALL_ (self->input, buffer_destroy, self->input_data);
#endif // ! HAVE_READLINE
}
LIST_FOR_EACH (struct buffer_line, iter, self->lines)
buffer_line_destroy (iter);
if (self->log_file)
(void) fclose (self->log_file);
if (self->user)
user_unref (self->user);
if (self->channel)
channel_unref (self->channel);
free (self);
}
REF_COUNTABLE_METHODS (buffer)
#define buffer_ref do_not_use_dangerous
// ~~~ Relay ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
struct client
{
LIST_HEADER (struct client)
struct app_context *ctx; ///< Application context
// TODO: Convert this all to TLS, and only TLS, with required client cert.
// That means replacing plumbing functions with the /other/ set from xD.
int socket_fd; ///< The TCP socket
struct str read_buffer; ///< Unprocessed input
struct str write_buffer; ///< Output yet to be sent out
uint32_t event_seq; ///< Outgoing message counter
bool initialized; ///< Initial sync took place
struct poller_fd socket_event; ///< The socket can be read/written to
};
static struct client *
client_new (void)
{
struct client *self = xcalloc (1, sizeof *self);
self->socket_fd = -1;
self->read_buffer = str_make ();
self->write_buffer = str_make ();
return self;
}
static void
client_destroy (struct client *self)
{
if (!soft_assert (self->socket_fd == -1))
xclose (self->socket_fd);
str_free (&self->read_buffer);
str_free (&self->write_buffer);
free (self);
}
static void client_kill (struct client *c);
// ~~~ Server ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// The only real purpose of this is to abstract away TLS
struct transport
{
/// Initialize the transport
bool (*init) (struct server *s, const char *hostname, struct error **e);
/// Destroy the user data pointer
void (*cleanup) (struct server *s);
/// The underlying socket may have become readable, update `read_buffer'
enum socket_io_result (*try_read) (struct server *s);
/// The underlying socket may have become writeable, flush `write_buffer'
enum socket_io_result (*try_write) (struct server *s);
/// Return event mask to use in the poller
int (*get_poll_events) (struct server *s);
/// Called just before closing the connection from our side
void (*in_before_shutdown) (struct server *s);
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
enum server_state
{
IRC_DISCONNECTED, ///< Not connected
IRC_CONNECTING, ///< Connecting to the server
IRC_CONNECTED, ///< Trying to register
IRC_REGISTERED, ///< We can chat now
IRC_CLOSING, ///< Flushing output before shutdown
IRC_HALF_CLOSED ///< Connection shutdown from our side
};
/// Convert an IRC identifier character to lower-case
typedef int (*irc_tolower_fn) (int);
/// Key conversion function for hashmap lookups
typedef size_t (*irc_strxfrm_fn) (char *, const char *, size_t);
struct server
{
REF_COUNTABLE_HEADER
struct app_context *ctx; ///< Application context
char *name; ///< Server identifier
struct buffer *buffer; ///< The buffer for this server
struct config_item *config; ///< Configuration root
// Connection:
enum server_state state; ///< Connection state
struct connector *connector; ///< Connection establisher
struct socks_connector *socks_conn; ///< SOCKS connection establisher
unsigned reconnect_attempt; ///< Number of reconnect attempt
bool manual_disconnect; ///< Don't reconnect after disconnect
int socket; ///< Socket FD of the server
struct str read_buffer; ///< Input yet to be processed
struct str write_buffer; ///< Outut yet to be be sent out
struct poller_fd socket_event; ///< We can read from the socket
struct transport *transport; ///< Transport method
void *transport_data; ///< Transport data
// Events:
struct poller_timer ping_tmr; ///< We should send a ping
struct poller_timer timeout_tmr; ///< Connection seems to be dead
struct poller_timer reconnect_tmr; ///< We should reconnect now
struct poller_timer autojoin_tmr; ///< Re/join channels as appropriate
// IRC:
// TODO: an output queue to prevent excess floods (this will be needed
// especially for away status polling)
bool rehashing; ///< Rehashing IRC identifiers
struct str_map irc_users; ///< IRC user data
struct str_map irc_channels; ///< IRC channel data
struct str_map irc_buffer_map; ///< Maps IRC identifiers to buffers
struct user *irc_user; ///< Our own user
int nick_counter; ///< Iterates "nicks" when registering
struct str irc_user_mode; ///< Our current user modes
char *irc_user_host; ///< Our current user@host
bool autoaway_active; ///< Autoaway is currently active
struct strv outstanding_joins; ///< JOINs we expect a response to
struct strv cap_ls_buf; ///< Buffer for IRCv3.2 CAP LS
bool cap_echo_message; ///< Whether the server echoes messages
bool cap_away_notify; ///< Whether we get AWAY notifications
bool cap_sasl; ///< Whether SASL is available
// Server-specific information (from RPL_ISUPPORT):
irc_tolower_fn irc_tolower; ///< Server tolower()
irc_strxfrm_fn irc_strxfrm; ///< Server strxfrm()
char *irc_chantypes; ///< Channel types (name prefixes)
char *irc_idchan_prefixes; ///< Prefixes for "safe channels"
char *irc_statusmsg; ///< Prefixes for channel targets
char irc_extban_prefix; ///< EXTBAN prefix or \0
char *irc_extban_types; ///< EXTBAN types
char *irc_chanmodes_list; ///< Channel modes for lists
char *irc_chanmodes_param_always; ///< Channel modes with mandatory param
char *irc_chanmodes_param_when_set; ///< Channel modes with param when set
char *irc_chanmodes_param_never; ///< Channel modes without param
char *irc_chanuser_prefixes; ///< Channel user prefixes
char *irc_chanuser_modes; ///< Channel user modes
unsigned irc_max_modes; ///< Max parametrized modes per command
};
static struct ispect_field g_server_ispect[] =
{
ISPECT( server, name, STRING )
ISPECT( server, state, INT )
ISPECT( server, reconnect_attempt, UINT )
ISPECT( server, manual_disconnect, BOOL )
ISPECT( server, irc_user_host, STRING )
ISPECT( server, autoaway_active, BOOL )
ISPECT( server, cap_echo_message, BOOL )
ISPECT_REF( server, buffer, false, buffer )
// TODO: either rename the underlying field or fix the plugins
{ "user", offsetof (struct server, irc_user),
ISPECT_REF, 0, g_user_ispect, false },
{ "user_mode", offsetof (struct server, irc_user_mode),
ISPECT_STR, 0, NULL, false },
{}
};
static void on_irc_timeout (void *user_data);
static void on_irc_ping_timeout (void *user_data);
static void on_irc_autojoin_timeout (void *user_data);
static void irc_initiate_connect (struct server *s);
static void
server_init_specifics (struct server *self)
{
// Defaults as per the RPL_ISUPPORT drafts, or RFC 1459
self->irc_tolower = irc_tolower;
self->irc_strxfrm = irc_strxfrm;
self->irc_chantypes = xstrdup ("#&");
self->irc_idchan_prefixes = xstrdup ("");
self->irc_statusmsg = xstrdup ("");
self->irc_extban_prefix = 0;
self->irc_extban_types = xstrdup ("");
self->irc_chanmodes_list = xstrdup ("b");
self->irc_chanmodes_param_always = xstrdup ("k");
self->irc_chanmodes_param_when_set = xstrdup ("l");
self->irc_chanmodes_param_never = xstrdup ("imnpst");
self->irc_chanuser_prefixes = xstrdup ("@+");
self->irc_chanuser_modes = xstrdup ("ov");
self->irc_max_modes = 3;
}
static void
server_free_specifics (struct server *self)
{
free (self->irc_chantypes);
free (self->irc_idchan_prefixes);
free (self->irc_statusmsg);
free (self->irc_extban_types);
free (self->irc_chanmodes_list);
free (self->irc_chanmodes_param_always);
free (self->irc_chanmodes_param_when_set);
free (self->irc_chanmodes_param_never);
free (self->irc_chanuser_prefixes);
free (self->irc_chanuser_modes);
}
static struct server *
server_new (struct poller *poller)
{
struct server *self = xcalloc (1, sizeof *self);
self->ref_count = 1;
self->socket = -1;
self->read_buffer = str_make ();
self->write_buffer = str_make ();
self->state = IRC_DISCONNECTED;
self->timeout_tmr = poller_timer_make (poller);
self->timeout_tmr.dispatcher = on_irc_timeout;
self->timeout_tmr.user_data = self;
self->ping_tmr = poller_timer_make (poller);
self->ping_tmr.dispatcher = on_irc_ping_timeout;
self->ping_tmr.user_data = self;
self->reconnect_tmr = poller_timer_make (poller);
self->reconnect_tmr.dispatcher = (poller_timer_fn) irc_initiate_connect;
self->reconnect_tmr.user_data = self;
self->autojoin_tmr = poller_timer_make (poller);
self->autojoin_tmr.dispatcher = on_irc_autojoin_timeout;
self->autojoin_tmr.user_data = self;
self->irc_users = str_map_make (NULL);
self->irc_users.key_xfrm = irc_strxfrm;
self->irc_channels = str_map_make (NULL);
self->irc_channels.key_xfrm = irc_strxfrm;
self->irc_buffer_map = str_map_make (NULL);
self->irc_buffer_map.key_xfrm = irc_strxfrm;
self->irc_user_mode = str_make ();
self->outstanding_joins = strv_make ();
self->cap_ls_buf = strv_make ();
server_init_specifics (self);
return self;
}
static void
server_destroy (struct server *self)
{
free (self->name);
if (self->connector)
{
connector_free (self->connector);
free (self->connector);
}
if (self->socks_conn)
{
socks_connector_free (self->socks_conn);
free (self->socks_conn);
}
if (self->transport
&& self->transport->cleanup)
self->transport->cleanup (self);
if (self->socket != -1)
{
poller_fd_reset (&self->socket_event);
xclose (self->socket);
}
str_free (&self->read_buffer);
str_free (&self->write_buffer);
poller_timer_reset (&self->ping_tmr);
poller_timer_reset (&self->timeout_tmr);
poller_timer_reset (&self->reconnect_tmr);
poller_timer_reset (&self->autojoin_tmr);
str_map_free (&self->irc_users);
str_map_free (&self->irc_channels);
str_map_free (&self->irc_buffer_map);
if (self->irc_user)
user_unref (self->irc_user);
str_free (&self->irc_user_mode);
free (self->irc_user_host);
strv_free (&self->outstanding_joins);
strv_free (&self->cap_ls_buf);
server_free_specifics (self);
free (self);
}
REF_COUNTABLE_METHODS (server)
#define server_ref do_not_use_dangerous
// ~~~ Scripting ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
struct plugin
{
LIST_HEADER (struct plugin)
char *name; ///< Name of the plugin
struct plugin_vtable *vtable; ///< Methods
};
struct plugin_vtable
{
/// Collect garbage
void (*gc) (struct plugin *self);
/// Unregister and free the plugin including all relevant resources
void (*free) (struct plugin *self);
};
static void
plugin_destroy (struct plugin *self)
{
self->vtable->free (self);
free (self->name);
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// This is a bit ugly since insertion is O(n) and the need to get rid of the
// specific type because of list macros, however I don't currently posses any
// strictly better, ordered data structure
struct hook
{
LIST_HEADER (struct hook)
int priority; ///< The lesser the sooner
};
static struct hook *
hook_insert (struct hook *list, struct hook *item)
{
// Corner cases: list is empty or we precede everything
if (!list || item->priority < list->priority)
{
LIST_PREPEND (list, item);
return list;
}
// Otherwise fast-forward to the last entry that precedes us
struct hook *before = list;
while (before->next && before->next->priority < item->priority)
before = before->next;
// And link ourselves in between it and its successor
if ((item->next = before->next))
item->next->prev = item;
before->next = item;
item->prev = before;
return list;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct input_hook
{
struct hook super; ///< Common hook fields
/// Takes over the ownership of "input", returns either NULL if input
/// was thrown away, or a possibly modified version of it
char *(*filter) (struct input_hook *self,
struct buffer *buffer, char *input);
};
struct irc_hook
{
struct hook super; ///< Common hook fields
/// Takes over the ownership of "message", returns either NULL if message
/// was thrown away, or a possibly modified version of it
char *(*filter) (struct irc_hook *self,
struct server *server, char *message);
};
struct prompt_hook
{
struct hook super; ///< Common hook fields
/// Returns what the prompt should look like right now based on other state
char *(*make) (struct prompt_hook *self);
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct completion_word
{
size_t start; ///< Offset to start of word
size_t end; ///< Offset to end of word
};
struct completion
{
char *line; ///< The line which is being completed
struct completion_word *words; ///< Word locations
size_t words_len; ///< Number of words
size_t words_alloc; ///< Number of words allocated
size_t location; ///< Which word is being completed
};
struct completion_hook
{
struct hook super; ///< Common hook fields
/// Tries to add possible completions of "word" to "output"
void (*complete) (struct completion_hook *self,
struct completion *data, const char *word, struct strv *output);
};
// ~~~ Main context ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
struct app_context
{
/// Default terminal attributes
struct attrs theme_defaults[ATTR_COUNT];
// Configuration:
struct config config; ///< Program configuration
struct attrs theme[ATTR_COUNT]; ///< Terminal attributes
bool isolate_buffers; ///< Isolate global/server buffers
bool beep_on_highlight; ///< Beep on highlight
bool logging; ///< Logging to file enabled
bool show_all_prefixes; ///< Show all prefixes before nicks
bool word_wrapping; ///< Enable simple word wrapping
struct str_map servers; ///< Our servers
// Relay:
int relay_fd; ///< Listening socket FD
struct client *clients; ///< Our relay clients
/// A single message buffer to prepare all outcoming messages within
struct relay_event_message relay_message;
// Events:
struct poller_fd tty_event; ///< Terminal input event
struct poller_fd signal_event; ///< Signal FD event
struct poller_fd relay_event; ///< New relay connection available
struct poller_timer flush_timer; ///< Flush all open files (e.g. logs)
struct poller_timer date_chg_tmr; ///< Print a date change
struct poller_timer autoaway_tmr; ///< Autoaway timer
struct poller poller; ///< Manages polled descriptors
bool quitting; ///< User requested quitting
bool polling; ///< The event loop is running
// Buffers:
struct buffer *buffers; ///< All our buffers in order
struct buffer *buffers_tail; ///< The tail of our buffers
struct buffer *global_buffer; ///< The global buffer
struct buffer *current_buffer; ///< The current buffer
struct buffer *last_buffer; ///< Last used buffer
struct str_map buffers_by_name; ///< Buffers by name
unsigned backlog_limit; ///< Limit for buffer lines
time_t last_displayed_msg_time; ///< Time of last displayed message
// Terminal:
iconv_t term_to_utf8; ///< Terminal encoding to UTF-8
iconv_t term_from_utf8; ///< UTF-8 to terminal encoding
struct input *input; ///< User interface
struct poller_idle prompt_event; ///< Deferred prompt refresh
struct poller_idle input_event; ///< Pending input event
struct strv pending_input; ///< Pending input lines
int *nick_palette; ///< A 256-colour palette for nicknames
size_t nick_palette_len; ///< Number of entries in nick_palette
bool awaiting_formatting_escape; ///< Awaiting an IRC formatting escape
bool in_bracketed_paste; ///< User is pasting some content
struct str input_buffer; ///< Buffered pasted content
bool running_pager; ///< Running a pager for buffer history
bool running_editor; ///< Running editor for the input
char *editor_filename; ///< The file being edited by user
int terminal_suspended; ///< Terminal suspension level
// Plugins:
struct plugin *plugins; ///< Loaded plugins
struct hook *input_hooks; ///< Input hooks
struct hook *irc_hooks; ///< IRC hooks
struct hook *prompt_hooks; ///< Prompt hooks
struct hook *completion_hooks; ///< Autocomplete hooks
}
*g_ctx;
static struct ispect_field g_ctx_ispect[] =
{
ISPECT_MAP_REF( app_context, servers, false, server )
ISPECT_REF( app_context, buffers, true, buffer )
ISPECT_REF( app_context, global_buffer, false, buffer )
ISPECT_REF( app_context, current_buffer, false, buffer )
{}
};
static int *
filter_color_cube_for_acceptable_nick_colors (size_t *len)
{
// This is a pure function and we don't use threads, static storage is fine
static int table[6 * 6 * 6];
size_t len_counter = 0;
for (int x = 0; x < (int) N_ELEMENTS (table); x++)
{
int r = x / 36;
int g = (x / 6) % 6;
int b = (x % 6);
// The first step is 95/255, the rest are 40/255,
// as an approximation we can double the first step
double linear_R = pow ((r + !!r) / 6., 2.2);
double linear_G = pow ((g + !!g) / 6., 2.2);
double linear_B = pow ((b + !!b) / 6., 2.2);
// Use the relative luminance of colours within the cube to filter
// colours that look okay-ish on terminals with both black and white
// backgrounds (use the test-nick-colors script to calibrate)
double Y = 0.2126 * linear_R + 0.7152 * linear_G + 0.0722 * linear_B;
if (Y >= .25 && Y <= .4)
table[len_counter++] = 16 + x;
}
*len = len_counter;
return table;
}
static bool
app_iconv_open (iconv_t *target, const char *to, const char *from)
{
if (ICONV_ACCEPTS_TRANSLIT)
{
char *to_real = xstrdup_printf ("%s//TRANSLIT", to);
*target = iconv_open (to_real, from);
free (to_real);
}
else
*target = iconv_open (to, from);
return *target != (iconv_t) -1;
}
static void
app_context_init (struct app_context *self)
{
memset (self, 0, sizeof *self);
self->config = config_make ();
poller_init (&self->poller);
self->relay_fd = -1;
self->servers = str_map_make ((str_map_free_fn) server_unref);
self->servers.key_xfrm = tolower_ascii_strxfrm;
self->buffers_by_name = str_map_make (NULL);
self->buffers_by_name.key_xfrm = tolower_ascii_strxfrm;
// So that we don't lose the logo shortly after startup
self->backlog_limit = 1000;
self->last_displayed_msg_time = time (NULL);
char *native = nl_langinfo (CODESET);
if (!app_iconv_open (&self->term_from_utf8, native, "UTF-8")
|| !app_iconv_open (&self->term_to_utf8, "UTF-8", native))
exit_fatal ("creating the UTF-8 conversion object failed: %s",
strerror (errno));
self->input = input_new ();
self->input->user_data = self;
self->pending_input = strv_make ();
self->input_buffer = str_make ();
self->nick_palette =
filter_color_cube_for_acceptable_nick_colors (&self->nick_palette_len);
}
static void
app_context_relay_stop (struct app_context *self)
{
if (self->relay_fd != -1)
{
poller_fd_reset (&self->relay_event);
xclose (self->relay_fd);
self->relay_fd = -1;
}
}
static void
app_context_free (struct app_context *self)
{
// Plugins can try to use of the other fields when destroyed
LIST_FOR_EACH (struct plugin, iter, self->plugins)
plugin_destroy (iter);
config_free (&self->config);
LIST_FOR_EACH (struct buffer, iter, self->buffers)
{
#ifdef HAVE_READLINE
// We can use the user interface here; see buffer_destroy()
CALL_ (self->input, buffer_destroy, iter->input_data);
iter->input_data = NULL;
#endif // HAVE_READLINE
buffer_unref (iter);
}
str_map_free (&self->buffers_by_name);
app_context_relay_stop (self);
LIST_FOR_EACH (struct client, c, self->clients)
client_kill (c);
relay_event_message_free (&self->relay_message);
str_map_free (&self->servers);
poller_free (&self->poller);
iconv_close (self->term_from_utf8);
iconv_close (self->term_to_utf8);
CALL (self->input, destroy);
strv_free (&self->pending_input);
str_free (&self->input_buffer);
free (self->editor_filename);
}
static void
refresh_prompt (struct app_context *ctx)
{
// XXX: the need for this conditional could probably be resolved
// by some clever reordering
if (ctx->prompt_event.poller)
poller_idle_set (&ctx->prompt_event);
}
// --- Configuration -----------------------------------------------------------
static void
on_config_debug_mode_change (struct config_item *item)
{
g_debug_mode = item->value.boolean;
}
static void
on_config_show_all_prefixes_change (struct config_item *item)
{
struct app_context *ctx = item->user_data;
ctx->show_all_prefixes = item->value.boolean;
refresh_prompt (ctx);
}
static void on_config_relay_bind_change (struct config_item *item);
static void on_config_backlog_limit_change (struct config_item *item);
static void on_config_theme_change (struct config_item *item);
static void on_config_logging_change (struct config_item *item);
#define TRIVIAL_BOOLEAN_ON_CHANGE(name) \
static void \
on_config_ ## name ## _change (struct config_item *item) \
{ \
struct app_context *ctx = item->user_data; \
ctx->name = item->value.boolean; \
}
TRIVIAL_BOOLEAN_ON_CHANGE (isolate_buffers)
TRIVIAL_BOOLEAN_ON_CHANGE (beep_on_highlight)
TRIVIAL_BOOLEAN_ON_CHANGE (word_wrapping)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
config_validate_nonjunk_string
(const struct config_item *item, struct error **e)
{
if (item->type == CONFIG_ITEM_NULL)
return true;
hard_assert (config_item_type_is_string (item->type));
for (size_t i = 0; i < item->value.string.len; i++)
{
// Not even a tabulator
unsigned char c = item->value.string.str[i];
if (iscntrl_ascii (c))
{
error_set (e, "control characters are not allowed");
return false;
}
}
return true;
}
static bool
config_validate_addresses
(const struct config_item *item, struct error **e)
{
if (item->type == CONFIG_ITEM_NULL)
return true;
if (!config_validate_nonjunk_string (item, e))
return false;
// Comma-separated list of "host[:port]" pairs
regex_t re;
int err = regcomp (&re, "^([^/:,]+(:[^/:,]+)?)?"
"(,([^/:,]+(:[^/:,]+)?)?)*$", REG_EXTENDED | REG_NOSUB);
hard_assert (!err);
bool result = !regexec (&re, item->value.string.str, 0, NULL, 0);
if (!result)
error_set (e, "invalid address list string");
regfree (&re);
return result;
}
static bool
config_validate_nonnegative
(const struct config_item *item, struct error **e)
{
if (item->type == CONFIG_ITEM_NULL)
return true;
hard_assert (item->type == CONFIG_ITEM_INTEGER);
if (item->value.integer >= 0)
return true;
error_set (e, "must be non-negative");
return false;
}
static struct config_schema g_config_server[] =
{
{ .name = "nicks",
.comment = "IRC nickname",
.type = CONFIG_ITEM_STRING_ARRAY,
.validate = config_validate_nonjunk_string },
{ .name = "username",
.comment = "IRC user name",
.type = CONFIG_ITEM_STRING,
.validate = config_validate_nonjunk_string },
{ .name = "realname",
.comment = "IRC real name/e-mail",
.type = CONFIG_ITEM_STRING,
.validate = config_validate_nonjunk_string },
{ .name = "addresses",
.comment = "Addresses of the IRC network (e.g. \"irc.net:6667\")",
.type = CONFIG_ITEM_STRING_ARRAY,
.validate = config_validate_addresses },
{ .name = "password",
.comment = "Password to connect to the server, if any",
.type = CONFIG_ITEM_STRING,
.validate = config_validate_nonjunk_string },
// XXX: if we add support for new capabilities, the value stays unchanged
{ .name = "capabilities",
.comment = "Capabilities to use if supported by server",
.type = CONFIG_ITEM_STRING_ARRAY,
.validate = config_validate_nonjunk_string,
.default_ = "\"multi-prefix,invite-notify,server-time,echo-message,"
"message-tags,away-notify,cap-notify,chghost\"" },
{ .name = "tls",
.comment = "Whether to use TLS",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "off" },
{ .name = "tls_cert",
.comment = "Client TLS certificate (PEM)",
.type = CONFIG_ITEM_STRING },
{ .name = "tls_verify",
.comment = "Whether to verify certificates",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "on" },
{ .name = "tls_ca_file",
.comment = "OpenSSL CA bundle file",
.type = CONFIG_ITEM_STRING },
{ .name = "tls_ca_path",
.comment = "OpenSSL CA bundle path",
.type = CONFIG_ITEM_STRING },
{ .name = "tls_ciphers",
.comment = "OpenSSL cipher preference list",
.type = CONFIG_ITEM_STRING,
.default_ = "\"DEFAULT:!MEDIUM:!LOW\"" },
{ .name = "autoconnect",
.comment = "Connect automatically on startup",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "on" },
{ .name = "autojoin",
.comment = "Channels to join on start (e.g. \"#abc,#def key,#ghi\")",
.type = CONFIG_ITEM_STRING_ARRAY,
.validate = config_validate_nonjunk_string },
{ .name = "command",
.comment = "Command to execute after a successful connect",
.type = CONFIG_ITEM_STRING },
{ .name = "command_delay",
.comment = "Delay between executing \"command\" and joining channels",
.type = CONFIG_ITEM_INTEGER,
.validate = config_validate_nonnegative,
.default_ = "0" },
{ .name = "reconnect",
.comment = "Whether to reconnect on error",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "on" },
{ .name = "reconnect_delay",
.comment = "Time between reconnecting",
.type = CONFIG_ITEM_INTEGER,
.validate = config_validate_nonnegative,
.default_ = "5" },
{ .name = "socks_host",
.comment = "Address of a SOCKS 4a/5 proxy",
.type = CONFIG_ITEM_STRING,
.validate = config_validate_nonjunk_string },
{ .name = "socks_port",
.comment = "SOCKS port number",
.type = CONFIG_ITEM_INTEGER,
.validate = config_validate_nonnegative,
.default_ = "1080" },
{ .name = "socks_username",
.comment = "SOCKS auth. username",
.type = CONFIG_ITEM_STRING },
{ .name = "socks_password",
.comment = "SOCKS auth. password",
.type = CONFIG_ITEM_STRING },
{}
};
static struct config_schema g_config_general[] =
{
{ .name = "autosave",
.comment = "Save configuration automatically after each change",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "on" },
{ .name = "debug_mode",
.comment = "Produce some debugging output",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "off",
.on_change = on_config_debug_mode_change },
{ .name = "logging",
.comment = "Log buffer contents to file",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "off",
.on_change = on_config_logging_change },
{ .name = "plugin_autoload",
.comment = "Plugins to automatically load on start",
.type = CONFIG_ITEM_STRING_ARRAY,
.validate = config_validate_nonjunk_string },
{ .name = "relay_bind",
.comment = "Address to bind to for a user interface relay point",
.type = CONFIG_ITEM_STRING,
.validate = config_validate_nonjunk_string,
.on_change = on_config_relay_bind_change },
// Buffer history:
{ .name = "backlog_limit",
.comment = "Maximum number of lines stored in the backlog",
.type = CONFIG_ITEM_INTEGER,
.validate = config_validate_nonnegative,
.default_ = "1000",
.on_change = on_config_backlog_limit_change },
{ .name = "pager",
.comment = "Shell command to page buffer history (args: name [path])",
.type = CONFIG_ITEM_STRING,
.default_ = "`name=$(echo \"$1\" | sed 's/[%?:.]/\\\\&/g'); "
"prompt='?f%F:'$name'. ?db- page %db?L of %D. .(?eEND:?PB%PB\\%..)'; "
"LESSSECURE=1 less +Gb -Ps\"$prompt\" \"${2:--R}\"`" },
{ .name = "pager_strip_formatting",
.comment = "Strip terminal formatting from pager input",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "off" },
// Output adjustments:
{ .name = "beep_on_highlight",
.comment = "Ring the bell when highlighted or on a new invisible PM",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "on",
.on_change = on_config_beep_on_highlight_change },
{ .name = "date_change_line",
.comment = "Input to strftime(3) for the date change line",
.type = CONFIG_ITEM_STRING,
.default_ = "\"%F\"" },
{ .name = "isolate_buffers",
.comment = "Don't leak messages from the server and global buffers",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "off",
.on_change = on_config_isolate_buffers_change },
{ .name = "read_marker_char",
.comment = "The character to use for the read marker line",
.type = CONFIG_ITEM_STRING,
.default_ = "\"-\"",
.validate = config_validate_nonjunk_string },
{ .name = "show_all_prefixes",
.comment = "Show all prefixes in front of nicknames",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "off",
.on_change = on_config_show_all_prefixes_change },
{ .name = "word_wrapping",
.comment = "Enable simple word wrapping in buffers",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "on",
.on_change = on_config_word_wrapping_change },
// User input:
{ .name = "editor",
.comment = "VIM: \"vim +%Bgo %F\", Emacs: \"emacs -nw +%L:%C %F\", "
"nano/micro/kakoune: \"nano/micro/kak +%L:%C %F\"",
.type = CONFIG_ITEM_STRING },
{ .name = "process_pasted_text",
.comment = "Normalize newlines and quote the command prefix in pastes",
.type = CONFIG_ITEM_BOOLEAN,
.default_ = "on" },
// Pan-server configuration:
{ .name = "autoaway_message",
.comment = "Automated away message",
.type = CONFIG_ITEM_STRING,
.default_ = "\"I'm not here right now\"" },
{ .name = "autoaway_delay",
.comment = "Delay from the last keypress in seconds",
.type = CONFIG_ITEM_INTEGER,
.validate = config_validate_nonnegative,
.default_ = "1800" },
{ .name = "reconnect_delay_growing",
.comment = "Growth factor for the reconnect delay",
.type = CONFIG_ITEM_INTEGER,
.validate = config_validate_nonnegative,
.default_ = "2" },
{ .name = "reconnect_delay_max",
.comment = "Maximum reconnect delay in seconds",
.type = CONFIG_ITEM_INTEGER,
.validate = config_validate_nonnegative,
.default_ = "600" },
{}
};
static struct config_schema g_config_theme[] =
{
#define XX(x, y, z) { .name = #y, .comment = #z, .type = CONFIG_ITEM_STRING, \
.on_change = on_config_theme_change },
ATTR_TABLE (XX)
#undef XX
{}
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
load_config_general (struct config_item *subtree, void *user_data)
{
config_schema_apply_to_object (g_config_general, subtree, user_data);
}
static void
load_config_theme (struct config_item *subtree, void *user_data)
{
config_schema_apply_to_object (g_config_theme, subtree, user_data);
}
static void
register_config_modules (struct app_context *ctx)
{
struct config *config = &ctx->config;
// The servers are loaded later when we can create buffers for them
config_register_module (config, "servers", NULL, NULL);
config_register_module (config, "aliases", NULL, NULL);
config_register_module (config, "plugins", NULL, NULL);
config_register_module (config, "general", load_config_general, ctx);
config_register_module (config, "theme", load_config_theme, ctx);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static const char *
get_config_string (struct config_item *root, const char *key)
{
struct config_item *item = config_item_get (root, key, NULL);
hard_assert (item);
if (item->type == CONFIG_ITEM_NULL)
return NULL;
hard_assert (config_item_type_is_string (item->type));
return item->value.string.str;
}
static bool
set_config_string
(struct config_item *root, const char *key, const char *value)
{
struct config_item *item = config_item_get (root, key, NULL);
hard_assert (item);
struct config_item *new_ = config_item_string_from_cstr (value);
struct error *e = NULL;
if (config_item_set_from (item, new_, &e))
return true;
config_item_destroy (new_);
print_error ("couldn't set `%s' in configuration: %s", key, e->message);
error_free (e);
return false;
}
static int64_t
get_config_integer (struct config_item *root, const char *key)
{
struct config_item *item = config_item_get (root, key, NULL);
hard_assert (item && item->type == CONFIG_ITEM_INTEGER);
return item->value.integer;
}
static bool
get_config_boolean (struct config_item *root, const char *key)
{
struct config_item *item = config_item_get (root, key, NULL);
hard_assert (item && item->type == CONFIG_ITEM_BOOLEAN);
return item->value.boolean;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static struct str_map *
get_servers_config (struct app_context *ctx)
{
return &config_item_get (ctx->config.root, "servers", NULL)->value.object;
}
static struct str_map *
get_aliases_config (struct app_context *ctx)
{
return &config_item_get (ctx->config.root, "aliases", NULL)->value.object;
}
static struct str_map *
get_plugins_config (struct app_context *ctx)
{
return &config_item_get (ctx->config.root, "plugins", NULL)->value.object;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
serialize_configuration (struct config_item *root, struct str *output)
{
str_append (output,
"# " PROGRAM_NAME " " PROGRAM_VERSION " configuration file\n"
"#\n"
"# Relative paths are searched for in ${XDG_CONFIG_HOME:-~/.config}\n"
"# /" PROGRAM_NAME " as well as in $XDG_CONFIG_DIRS/" PROGRAM_NAME "\n"
"#\n"
"# Everything is in UTF-8. Any custom comments will be overwritten.\n"
"\n");
config_item_write (root, true, output);
}
// --- Relay output ------------------------------------------------------------
static void
client_kill (struct client *c)
{
struct app_context *ctx = c->ctx;
poller_fd_reset (&c->socket_event);
xclose (c->socket_fd);
c->socket_fd = -1;
LIST_UNLINK (ctx->clients, c);
client_destroy (c);
}
static void
client_update_poller (struct client *c, const struct pollfd *pfd)
{
int new_events = POLLIN;
if (c->write_buffer.len)
new_events |= POLLOUT;
hard_assert (new_events != 0);
if (!pfd || pfd->events != new_events)
poller_fd_set (&c->socket_event, new_events);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
relay_send (struct client *c)
{
struct relay_event_message *m = &c->ctx->relay_message;
m->event_seq = c->event_seq++;
// TODO: Also don't try sending anything if half-closed.
if (!c->initialized || c->socket_fd == -1)
return;
// liberty has msg_{reader,writer} already, but they use 8-byte lengths.
size_t frame_len_pos = c->write_buffer.len, frame_len = 0;
str_pack_u32 (&c->write_buffer, 0);
if (!relay_event_message_serialize (m, &c->write_buffer)
|| (frame_len = c->write_buffer.len - frame_len_pos - 4) > UINT32_MAX)
{
print_error ("serialization failed, killing client");
client_kill (c);
return;
}
uint32_t len = htonl (frame_len);
memcpy (c->write_buffer.str + frame_len_pos, &len, sizeof len);
client_update_poller (c, NULL);
}
static void
relay_broadcast (struct app_context *ctx)
{
LIST_FOR_EACH (struct client, c, ctx->clients)
relay_send (c);
}
static struct relay_event_message *
relay_prepare (struct app_context *ctx)
{
struct relay_event_message *m = &ctx->relay_message;
relay_event_message_free (m);
memset (m, 0, sizeof *m);
return m;
}
static void
relay_prepare_ping (struct app_context *ctx)
{
relay_prepare (ctx)->data.event = RELAY_EVENT_PING;
}
static void
relay_prepare_buffer_update (struct app_context *ctx, struct buffer *buffer)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_buffer_update *e = &m->data.buffer_update;
e->event = RELAY_EVENT_BUFFER_UPDATE;
e->buffer_name = str_from_cstr (buffer->name);
e->hide_unimportant = buffer->hide_unimportant;
struct str *server_name = NULL;
switch (buffer->type)
{
case BUFFER_GLOBAL:
e->context.kind = RELAY_BUFFER_KIND_GLOBAL;
break;
case BUFFER_SERVER:
e->context.kind = RELAY_BUFFER_KIND_SERVER;
server_name = &e->context.server.server_name;
break;
case BUFFER_CHANNEL:
e->context.kind = RELAY_BUFFER_KIND_CHANNEL;
server_name = &e->context.channel.server_name;
break;
case BUFFER_PM:
e->context.kind = RELAY_BUFFER_KIND_PRIVATE_MESSAGE;
server_name = &e->context.private_message.server_name;
break;
}
if (server_name)
*server_name = str_from_cstr (buffer->server->name);
}
static void
relay_prepare_buffer_stats (struct app_context *ctx, struct buffer *buffer)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_buffer_stats *e = &m->data.buffer_stats;
e->event = RELAY_EVENT_BUFFER_STATS;
e->buffer_name = str_from_cstr (buffer->name);
e->new_messages = MIN (UINT32_MAX,
buffer->new_messages_count - buffer->new_unimportant_count);
e->new_unimportant_messages = MIN (UINT32_MAX,
buffer->new_unimportant_count);
e->highlighted = buffer->highlighted;
}
static void
relay_prepare_buffer_rename (struct app_context *ctx, struct buffer *buffer,
const char *new_name)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_buffer_rename *e = &m->data.buffer_rename;
e->event = RELAY_EVENT_BUFFER_RENAME;
e->buffer_name = str_from_cstr (buffer->name);
e->new = str_from_cstr (new_name);
}
static void
relay_prepare_buffer_remove (struct app_context *ctx, struct buffer *buffer)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_buffer_remove *e = &m->data.buffer_remove;
e->event = RELAY_EVENT_BUFFER_REMOVE;
e->buffer_name = str_from_cstr (buffer->name);
}
static void
relay_prepare_buffer_activate (struct app_context *ctx, struct buffer *buffer)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_buffer_activate *e = &m->data.buffer_activate;
e->event = RELAY_EVENT_BUFFER_ACTIVATE;
e->buffer_name = str_from_cstr (buffer->name);
}
static union relay_item_data *
relay_translate_formatter (struct app_context *ctx, union relay_item_data *p,
struct formatter_item *i)
{
// XXX: See attr_printer_decode_color(), this is a footgun.
int16_t c16 = i->color;
int16_t c256 = i->color >> 16;
unsigned attrs = i->attribute;
switch (i->type)
{
case FORMATTER_ITEM_TEXT:
p->text.text = str_from_cstr (i->text);
(p++)->kind = RELAY_ITEM_TEXT;
break;
case FORMATTER_ITEM_FG_COLOR:
p->fg_color.color = c256 <= 0 ? c16 : c256;
(p++)->kind = RELAY_ITEM_FG_COLOR;
break;
case FORMATTER_ITEM_BG_COLOR:
p->bg_color.color = c256 <= 0 ? c16 : c256;
(p++)->kind = RELAY_ITEM_BG_COLOR;
break;
case FORMATTER_ITEM_ATTR:
(p++)->kind = RELAY_ITEM_RESET;
if ((c256 = ctx->theme[i->attribute].fg) >= 0)
{
p->fg_color.color = c256;
(p++)->kind = RELAY_ITEM_FG_COLOR;
}
if ((c256 = ctx->theme[i->attribute].bg) >= 0)
{
p->bg_color.color = c256;
(p++)->kind = RELAY_ITEM_BG_COLOR;
}
attrs = ctx->theme[i->attribute].attrs;
// Fall-through
case FORMATTER_ITEM_SIMPLE:
if (attrs & TEXT_BOLD)
(p++)->kind = RELAY_ITEM_FLIP_BOLD;
if (attrs & TEXT_ITALIC)
(p++)->kind = RELAY_ITEM_FLIP_ITALIC;
if (attrs & TEXT_UNDERLINE)
(p++)->kind = RELAY_ITEM_FLIP_UNDERLINE;
if (attrs & TEXT_INVERSE)
(p++)->kind = RELAY_ITEM_FLIP_INVERSE;
if (attrs & TEXT_CROSSED_OUT)
(p++)->kind = RELAY_ITEM_FLIP_CROSSED_OUT;
if (attrs & TEXT_MONOSPACE)
(p++)->kind = RELAY_ITEM_FLIP_MONOSPACE;
break;
default:
break;
}
return p;
}
static void
relay_prepare_buffer_line (struct app_context *ctx, struct buffer *buffer,
struct buffer_line *line, bool leak_to_active)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_buffer_line *e = &m->data.buffer_line;
e->event = RELAY_EVENT_BUFFER_LINE;
e->buffer_name = str_from_cstr (buffer->name);
e->is_unimportant = !!(line->flags & BUFFER_LINE_UNIMPORTANT);
e->is_highlight = !!(line->flags & BUFFER_LINE_HIGHLIGHT);
e->rendition = 1 + line->r;
e->when = line->when * 1000;
e->leak_to_active = leak_to_active;
size_t len = 0;
for (size_t i = 0; line->items[i].type; i++)
len++;
// Beware of the upper bound, currently dominated by FORMATTER_ITEM_ATTR.
union relay_item_data *p = e->items = xcalloc (len * 9, sizeof *e->items);
for (struct formatter_item *i = line->items; len--; i++)
p = relay_translate_formatter (ctx, p, i);
e->items_len = p - e->items;
}
static void
relay_prepare_buffer_clear (struct app_context *ctx,
struct buffer *buffer)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_buffer_clear *e = &m->data.buffer_clear;
e->event = RELAY_EVENT_BUFFER_CLEAR;
e->buffer_name = str_from_cstr (buffer->name);
}
enum relay_server_state
relay_server_state_for_server (struct server *s)
{
switch (s->state)
{
case IRC_DISCONNECTED: return RELAY_SERVER_STATE_DISCONNECTED;
case IRC_CONNECTING: return RELAY_SERVER_STATE_CONNECTING;
case IRC_CONNECTED: return RELAY_SERVER_STATE_CONNECTED;
case IRC_REGISTERED: return RELAY_SERVER_STATE_REGISTERED;
case IRC_CLOSING:
case IRC_HALF_CLOSED: return RELAY_SERVER_STATE_DISCONNECTING;
}
return 0;
}
static void
relay_prepare_server_update (struct app_context *ctx, struct server *s)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_server_update *e = &m->data.server_update;
e->event = RELAY_EVENT_SERVER_UPDATE;
e->server_name = str_from_cstr (s->name);
e->state = relay_server_state_for_server (s);
}
static void
relay_prepare_server_rename (struct app_context *ctx, struct server *s,
const char *new_name)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_server_rename *e = &m->data.server_rename;
e->event = RELAY_EVENT_SERVER_RENAME;
e->server_name = str_from_cstr (s->name);
e->new = str_from_cstr (new_name);
}
static void
relay_prepare_server_remove (struct app_context *ctx, struct server *s)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_server_remove *e = &m->data.server_remove;
e->event = RELAY_EVENT_SERVER_REMOVE;
e->server_name = str_from_cstr (s->name);
}
static void
relay_prepare_error (struct app_context *ctx, uint32_t seq, const char *message)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_error *e = &m->data.error;
e->event = RELAY_EVENT_ERROR;
e->command_seq = seq;
e->error = str_from_cstr (message);
}
static struct relay_event_data_response *
relay_prepare_response (struct app_context *ctx, uint32_t seq)
{
struct relay_event_message *m = relay_prepare (ctx);
struct relay_event_data_response *e = &m->data.response;
e->event = RELAY_EVENT_RESPONSE;
e->command_seq = seq;
return e;
}
// --- Terminal output ---------------------------------------------------------
/// Default colour pair
#define COLOR_DEFAULT -1
/// Bright versions of the basic colour set
#define COLOR_BRIGHT(x) (COLOR_ ## x + 8)
/// Builds a colour pair for 256-colour terminals with a 16-colour backup value
#define COLOR_256(name, c256) \
(((COLOR_ ## name) & 0xFFFF) | (((c256) & 0xFFFF) << 16))
typedef int (*terminal_printer_fn) (int);
static int
putchar_stderr (int c)
{
return fputc (c, stderr);
}
static terminal_printer_fn
get_attribute_printer (FILE *stream)
{
if (stream == stdout && g_terminal.stdout_is_tty)
return putchar;
if (stream == stderr && g_terminal.stderr_is_tty)
return putchar_stderr;
return NULL;
}
// ~~~ Attribute printer ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// A little tool that tries to make the most of the terminal's capabilities
// to set up text attributes. It mostly targets just terminal emulators as that
// is what people are using these days. At least no stupid ncurses limits us
// with colour pairs.
struct attr_printer
{
struct attrs *attrs; ///< Named attributes
FILE *stream; ///< Output stream
bool dirty; ///< Attributes are set
};
#define ATTR_PRINTER_INIT(attrs, stream) { attrs, stream, true }
static void
attr_printer_filtered_puts (FILE *stream, const char *attr)
{
for (; *attr; attr++)
{
// sgr/set_attributes and sgr0/exit_attribute_mode like to enable or
// disable the ACS with SO/SI (e.g. for TERM=screen), however `less -R`
// does not skip over these characters and it screws up word wrapping
if (*attr == 14 /* SO */ || *attr == 15 /* SI */)
continue;
// Trivially skip delay sequences intended to be processed by tputs()
const char *end = NULL;
if (attr[0] == '$' && attr[1] == '<' && (end = strchr (attr, '>')))
attr = end;
else
fputc (*attr, stream);
}
}
static void
attr_printer_tputs (struct attr_printer *self, const char *attr)
{
terminal_printer_fn printer = get_attribute_printer (self->stream);
if (printer)
tputs (attr, 1, printer);
else
// We shouldn't really do this but we need it to output formatting
// to the pager--it should be SGR-only
attr_printer_filtered_puts (self->stream, attr);
}
static void
attr_printer_reset (struct attr_printer *self)
{
if (self->dirty)
attr_printer_tputs (self, exit_attribute_mode);
self->dirty = false;
}
// NOTE: commonly terminals have:
// 8 colours (worst, bright fg often with BOLD, bg sometimes with BLINK)
// 16 colours (okayish, we have the full basic range guaranteed)
// 88 colours (the same plus a 4^3 RGB cube and a few shades of grey)
// 256 colours (best, like above but with a larger cube and more grey)
/// Interpolate from the 256-colour palette to the 88-colour one
static int
attr_printer_256_to_88 (int color)
{
// These colours are the same everywhere
if (color < 16)
return color;
// 24 -> 8 extra shades of grey
if (color >= 232)
return 80 + (color - 232) / 3;
// 6 * 6 * 6 cube -> 4 * 4 * 4 cube
int x[6] = { 0, 1, 1, 2, 2, 3 };
int index = color - 16;
return 16 +
( x[ index / 36 ] << 8
| x[(index / 6) % 6 ] << 4
| x[(index % 6) ] );
}
static int
attr_printer_decode_color (int color, bool *is_bright)
{
int16_t c16 = color; hard_assert (c16 < 16);
int16_t c256 = color >> 16; hard_assert (c256 < 256);
*is_bright = false;
switch (max_colors)
{
case 8:
if (c16 >= 8)
{
c16 -= 8;
*is_bright = true;
}
// Fall-through
case 16:
return c16;
case 88:
return c256 <= 0 ? c16 : attr_printer_256_to_88 (c256);
case 256:
return c256 <= 0 ? c16 : c256;
default:
// Unsupported palette
return -1;
}
}
static void
attr_printer_apply (struct attr_printer *self,
int text_attrs, int wanted_fg, int wanted_bg)
{
bool fg_is_bright;
int fg = attr_printer_decode_color (wanted_fg, &fg_is_bright);
bool bg_is_bright;
int bg = attr_printer_decode_color (wanted_bg, &bg_is_bright);
bool have_inverse = !!(text_attrs & TEXT_INVERSE);
if (have_inverse)
{
bool tmp = fg_is_bright;
fg_is_bright = bg_is_bright;
bg_is_bright = tmp;
}
// In 8 colour mode, some terminals don't support bright backgrounds.
// However, we can make use of the fact that the brightness change caused
// by the bold attribute is retained when inverting the colours.
// This has the downside of making the text bold when it's not supposed
// to be, and we still can't make both colours bright, so it's more of
// an interesting hack rather than anything else.
if (!fg_is_bright && bg_is_bright && have_inverse)
text_attrs |= TEXT_BOLD;
else if (!fg_is_bright && bg_is_bright
&& !have_inverse && fg >= 0 && bg >= 0)
{
// As long as none of the colours is the default, we can swap them
int tmp = fg; fg = bg; bg = tmp;
text_attrs |= TEXT_BOLD | TEXT_INVERSE;
}
else
{
// This often works, however...
if (fg_is_bright) text_attrs |= TEXT_BOLD;
// this turns out to be annoying if implemented "correctly"
if (bg_is_bright) text_attrs |= TEXT_BLINK;
}
attr_printer_reset (self);
// TEXT_MONOSPACE is unimplemented, for obvious reasons
if (text_attrs)
attr_printer_tputs (self, tparm (set_attributes,
0, // standout
text_attrs & TEXT_UNDERLINE,
text_attrs & TEXT_INVERSE,
text_attrs & TEXT_BLINK,
0, // dim
text_attrs & TEXT_BOLD,
0, // blank
0, // protect
0)); // acs
if ((text_attrs & TEXT_ITALIC) && enter_italics_mode)
attr_printer_tputs (self, enter_italics_mode);
char *smxx = NULL;
if ((text_attrs & TEXT_CROSSED_OUT)
&& (smxx = tigetstr ("smxx")) && smxx != (char *) -1)
attr_printer_tputs (self, smxx);
if (fg >= 0)
attr_printer_tputs (self, g_terminal.color_set_fg[fg]);
if (bg >= 0)
attr_printer_tputs (self, g_terminal.color_set_bg[bg]);
self->dirty = true;
}
static void
attr_printer_apply_named (struct attr_printer *self, int attribute)
{
attr_printer_reset (self);
if (attribute == ATTR_RESET)
return;
// See the COLOR_256 macro or attr_printer_decode_color().
struct attrs *a = &self->attrs[attribute];
attr_printer_apply (self, a->attrs,
a->fg < 16 ? a->fg : (a->fg << 16 | (-1 & 0xFFFF)),
a->bg < 16 ? a->bg : (a->bg << 16 | (-1 & 0xFFFF)));
self->dirty = true;
}
// ~~~ Logging redirect ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
static void
vprint_attributed (struct app_context *ctx,
FILE *stream, intptr_t attribute, const char *fmt, va_list ap)
{
terminal_printer_fn printer = get_attribute_printer (stream);
if (!attribute)
printer = NULL;
struct attr_printer state = ATTR_PRINTER_INIT (ctx->theme, stream);
if (printer)
attr_printer_apply_named (&state, attribute);
vfprintf (stream, fmt, ap);
if (printer)
attr_printer_reset (&state);
}
static void
print_attributed (struct app_context *ctx,
FILE *stream, intptr_t attribute, const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
vprint_attributed (ctx, stream, attribute, fmt, ap);
va_end (ap);
}
static void
log_message_attributed (void *user_data, const char *quote, const char *fmt,
va_list ap)
{
FILE *stream = stderr;
struct app_context *ctx = g_ctx;
CALL (ctx->input, hide);
print_attributed (ctx, stream, (intptr_t) user_data, "%s", quote);
vprint_attributed (ctx, stream, (intptr_t) user_data, fmt, ap);
fputs ("\n", stream);
CALL (ctx->input, show);
}
// ~~~ Theme ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
static ssize_t
attr_by_name (const char *name)
{
static const char *table[ATTR_COUNT] =
{
NULL,
#define XX(x, y, z) [ATTR_ ## x] = #y,
ATTR_TABLE (XX)
#undef XX
};
for (size_t i = 1; i < N_ELEMENTS (table); i++)
if (!strcmp (name, table[i]))
return i;
return -1;
}
static void
on_config_theme_change (struct config_item *item)
{
struct app_context *ctx = item->user_data;
ssize_t id = attr_by_name (item->schema->name);
if (id != -1)
{
// TODO: There should be a validator.
ctx->theme[id] = item->type == CONFIG_ITEM_NULL
? ctx->theme_defaults[id]
: attrs_decode (item->value.string.str);
}
}
static void
init_colors (struct app_context *ctx)
{
bool have_ti = init_terminal ();
#define INIT_ATTR(id, ...) ctx->theme[ATTR_ ## id] = \
ctx->theme_defaults[ATTR_ ## id] = (struct attrs) { __VA_ARGS__ }
INIT_ATTR (PROMPT, -1, -1, TEXT_BOLD);
INIT_ATTR (RESET, -1, -1, 0);
INIT_ATTR (DATE_CHANGE, -1, -1, TEXT_BOLD);
INIT_ATTR (READ_MARKER, COLOR_MAGENTA, -1, 0);
INIT_ATTR (WARNING, COLOR_YELLOW, -1, 0);
INIT_ATTR (ERROR, COLOR_RED, -1, 0);
INIT_ATTR (EXTERNAL, COLOR_WHITE, -1, 0);
INIT_ATTR (TIMESTAMP, COLOR_WHITE, -1, 0);
INIT_ATTR (HIGHLIGHT, COLOR_BRIGHT (YELLOW), COLOR_MAGENTA, TEXT_BOLD);
INIT_ATTR (ACTION, COLOR_RED, -1, 0);
INIT_ATTR (USERHOST, COLOR_CYAN, -1, 0);
INIT_ATTR (JOIN, COLOR_GREEN, -1, 0);
INIT_ATTR (PART, COLOR_RED, -1, 0);
#undef INIT_ATTR
// This prevents formatters from obtaining an attribute printer function
if (!have_ti)
{
g_terminal.stdout_is_tty = false;
g_terminal.stderr_is_tty = false;
}
g_log_message_real = log_message_attributed;
}
// --- Helpers -----------------------------------------------------------------
static int
irc_server_strcmp (struct server *s, const char *a, const char *b)
{
int x;
while (*a || *b)
if ((x = s->irc_tolower (*a++) - s->irc_tolower (*b++)))
return x;
return 0;
}
static int
irc_server_strncmp (struct server *s, const char *a, const char *b, size_t n)
{
int x;
while (n-- && (*a || *b))
if ((x = s->irc_tolower (*a++) - s->irc_tolower (*b++)))
return x;
return 0;
}
static char *
irc_cut_nickname (const char *prefix)
{
return cstr_cut_until (prefix, "!@");
}
static const char *
irc_find_userhost (const char *prefix)
{
const char *p = strchr (prefix, '!');
return p ? p + 1 : NULL;
}
static bool
irc_is_this_us (struct server *s, const char *prefix)
{
// This shouldn't be called before successfully registering.
// Better safe than sorry, though.
if (!s->irc_user)
return false;
char *nick = irc_cut_nickname (prefix);
bool result = !irc_server_strcmp (s, nick, s->irc_user->nickname);
free (nick);
return result;
}
static bool
irc_is_channel (struct server *s, const char *ident)
{
return *ident
&& (!!strchr (s->irc_chantypes, *ident) ||
!!strchr (s->irc_idchan_prefixes, *ident));
}
// Message targets can be prefixed by a character filtering their targets
static const char *
irc_skip_statusmsg (struct server *s, const char *target)
{
return target + (*target && strchr (s->irc_statusmsg, *target));
}
static bool
irc_is_extban (struct server *s, const char *target)
{
// Some servers have a prefix, and some support negation
if (s->irc_extban_prefix && *target++ != s->irc_extban_prefix)
return false;
if (*target == '~')
target++;
// XXX: we don't know if it's supposed to have an argument, or not
return *target && strchr (s->irc_extban_types, *target++)
&& strchr (":\0", *target);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// As of 2020, everything should be in UTF-8. And if it's not, we'll decode it
// as ISO Latin 1. This function should not be called on the whole message.
static char *
irc_to_utf8 (const char *text)
{
if (!text)
return NULL;
// XXX: the validation may be unnecessarily harsh, could do with a lenient
// first pass, then replace any errors with the replacement character
size_t len = strlen (text) + 1;
if (utf8_validate (text, len))
return xstrdup (text);
// Windows 1252 redefines several silly C1 control characters as glyphs
static const char c1[32][4] =
{
"\xe2\x82\xac", "\xc2\x81", "\xe2\x80\x9a", "\xc6\x92",
"\xe2\x80\x9e", "\xe2\x80\xa6", "\xe2\x80\xa0", "\xe2\x80\xa1",
"\xcb\x86", "\xe2\x80\xb0", "\xc5\xa0", "\xe2\x80\xb9",
"\xc5\x92", "\xc2\x8d", "\xc5\xbd", "\xc2\x8f",
"\xc2\x90", "\xe2\x80\x98", "\xe2\x80\x99", "\xe2\x80\x9c",
"\xe2\x80\x9d", "\xe2\x80\xa2", "\xe2\x80\x93", "\xe2\x80\x94",
"\xcb\x9c", "\xe2\x84\xa2", "\xc5\xa1", "\xe2\x80\xba",
"\xc5\x93", "\xc2\x9d", "\xc5\xbe", "\xc5\xb8",
};
struct str s = str_make ();
for (const char *p = text; *p; p++)
{
int c = *(unsigned char *) p;
if (c < 0x80)
str_append_c (&s, c);
else if (c < 0xA0)
str_append (&s, c1[c & 0x1f]);
else
str_append_data (&s,
(char[]) {0xc0 | (c >> 6), 0x80 | (c & 0x3f)}, 2);
}
return str_steal (&s);
}
// --- Output formatter --------------------------------------------------------
// This complicated piece of code makes attributed text formatting simple.
// We use a printf-inspired syntax to push attributes and text to the object,
// then flush it either to a terminal, or a log file with formatting stripped.
//
// Format strings use a #-quoted notation, to differentiate from printf:
// #s inserts a string (expected to be in UTF-8)
// #d inserts a signed integer
// #l inserts a locale-encoded string
//
// #S inserts a string from the server in an unknown encoding
// #m inserts an IRC-formatted string (auto-resets at boundaries)
// #n cuts the nickname from a string and automatically colours it
// #N is like #n but also appends userhost, if present
//
// #a inserts named attributes (auto-resets)
// #r resets terminal attributes
// #c sets foreground colour
// #C sets background colour
//
// Modifiers:
// & free() the string argument after using it
static void
formatter_add_item (struct formatter *self, struct formatter_item template_)
{
// Auto-resetting tends to create unnecessary items,
// which also end up being relayed to frontends, so filter them out.
bool reset =
template_.type == FORMATTER_ITEM_ATTR &&
template_.attribute == ATTR_RESET;
if (self->clean && reset)
return;
self->clean = reset ||
(self->clean && template_.type == FORMATTER_ITEM_TEXT);
if (template_.text)
template_.text = xstrdup (template_.text);
if (self->items_len == self->items_alloc)
self->items = xreallocarray
(self->items, sizeof *self->items, (self->items_alloc <<= 1));
self->items[self->items_len++] = template_;
}
#define FORMATTER_ADD_ITEM(self, type_, ...) formatter_add_item ((self), \
(struct formatter_item) { .type = FORMATTER_ITEM_ ## type_, __VA_ARGS__ })
#define FORMATTER_ADD_RESET(self) \
FORMATTER_ADD_ITEM ((self), ATTR, .attribute = ATTR_RESET)
#define FORMATTER_ADD_TEXT(self, text_) \
FORMATTER_ADD_ITEM ((self), TEXT, .text = (text_))
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
enum
{
MIRC_WHITE, MIRC_BLACK, MIRC_BLUE, MIRC_GREEN,
MIRC_L_RED, MIRC_RED, MIRC_PURPLE, MIRC_ORANGE,
MIRC_YELLOW, MIRC_L_GREEN, MIRC_CYAN, MIRC_L_CYAN,
MIRC_L_BLUE, MIRC_L_PURPLE, MIRC_GRAY, MIRC_L_GRAY,
};
// We use estimates from the 16 colour terminal palette, or the 256 colour cube,
// which is not always available. The mIRC orange colour is only in the cube.
static const int g_mirc_to_terminal[] =
{
[MIRC_WHITE] = COLOR_256 (BRIGHT (WHITE), 231),
[MIRC_BLACK] = COLOR_256 (BLACK, 16),
[MIRC_BLUE] = COLOR_256 (BLUE, 19),
[MIRC_GREEN] = COLOR_256 (GREEN, 34),
[MIRC_L_RED] = COLOR_256 (BRIGHT (RED), 196),
[MIRC_RED] = COLOR_256 (RED, 124),
[MIRC_PURPLE] = COLOR_256 (MAGENTA, 127),
[MIRC_ORANGE] = COLOR_256 (BRIGHT (YELLOW), 214),
[MIRC_YELLOW] = COLOR_256 (BRIGHT (YELLOW), 226),
[MIRC_L_GREEN] = COLOR_256 (BRIGHT (GREEN), 46),
[MIRC_CYAN] = COLOR_256 (CYAN, 37),
[MIRC_L_CYAN] = COLOR_256 (BRIGHT (CYAN), 51),
[MIRC_L_BLUE] = COLOR_256 (BRIGHT (BLUE), 21),
[MIRC_L_PURPLE] = COLOR_256 (BRIGHT (MAGENTA),201),
[MIRC_GRAY] = COLOR_256 (BRIGHT (BLACK), 244),
[MIRC_L_GRAY] = COLOR_256 (WHITE, 252),
};
// https://modern.ircdocs.horse/formatting.html
// http://anti.teamidiot.de/static/nei/*/extended_mirc_color_proposal.html
static const int16_t g_extra_to_256[100 - 16] =
{
52, 94, 100, 58, 22, 29, 23, 24, 17, 54, 53, 89,
88, 130, 142, 64, 28, 35, 30, 25, 18, 91, 90, 125,
124, 166, 184, 106, 34, 49, 37, 33, 19, 129, 127, 161,
196, 208, 226, 154, 46, 86 , 51, 75, 21, 171, 201, 198,
203, 215, 227, 191, 83, 122, 87, 111, 63, 177, 207, 205,
217, 223, 229, 193, 157, 158, 159, 153, 147, 183, 219, 212,
16, 233, 235, 237, 239, 241, 244, 247, 250, 254, 231, -1
};
static const char *
irc_parse_mirc_color (const char *s, uint8_t *fg, uint8_t *bg)
{
if (!isdigit_ascii (*s))
{
*fg = *bg = 99;
return s;
}
*fg = *s++ - '0';
if (isdigit_ascii (*s))
*fg = *fg * 10 + (*s++ - '0');
if (*s != ',' || !isdigit_ascii (s[1]))
return s;
s++;
*bg = *s++ - '0';
if (isdigit_ascii (*s))
*bg = *bg * 10 + (*s++ - '0');
return s;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct irc_char_attrs
{
uint8_t fg, bg; ///< {Fore,back}ground colour or 99
uint8_t attributes; ///< TEXT_* flags, except TEXT_BLINK
uint8_t starts_at_boundary; ///< Possible to split here?
};
static void
irc_serialize_char_attrs (const struct irc_char_attrs *attrs, struct str *out)
{
soft_assert (attrs->fg < 100 && attrs->bg < 100);
if (attrs->fg != 99 || attrs->bg != 99)
{
str_append_printf (out, "\x03%u", attrs->fg);
if (attrs->bg != 99)
str_append_printf (out, ",%02u", attrs->bg);
}
if (attrs->attributes & TEXT_BOLD) str_append_c (out, '\x02');
if (attrs->attributes & TEXT_ITALIC) str_append_c (out, '\x1d');
if (attrs->attributes & TEXT_UNDERLINE) str_append_c (out, '\x1f');
if (attrs->attributes & TEXT_INVERSE) str_append_c (out, '\x16');
if (attrs->attributes & TEXT_CROSSED_OUT) str_append_c (out, '\x1e');
if (attrs->attributes & TEXT_MONOSPACE) str_append_c (out, '\x11');
}
static int
irc_parse_attribute (char c)
{
switch (c)
{
case '\x02' /* ^B */: return TEXT_BOLD;
case '\x11' /* ^Q */: return TEXT_MONOSPACE;
case '\x16' /* ^V */: return TEXT_INVERSE;
case '\x1d' /* ^] */: return TEXT_ITALIC;
case '\x1e' /* ^^ */: return TEXT_CROSSED_OUT;
case '\x1f' /* ^_ */: return TEXT_UNDERLINE;
case '\x0f' /* ^O */: return -1;
}
return 0;
}
// The text needs to be NUL-terminated, and a valid UTF-8 string
static struct irc_char_attrs *
irc_analyze_text (const char *text, size_t len)
{
struct irc_char_attrs *attrs = xcalloc (len, sizeof *attrs),
blank = { .fg = 99, .bg = 99, .starts_at_boundary = true },
next = blank, cur = next;
for (size_t i = 0; i != len; cur = next)
{
const char *start = text;
hard_assert (utf8_decode (&text, len - i) >= 0);
int attribute = irc_parse_attribute (*start);
if (*start == '\x03')
text = irc_parse_mirc_color (text, &next.fg, &next.bg);
else if (attribute > 0)
next.attributes ^= attribute;
else if (attribute < 0)
next = blank;
while (start++ != text)
{
attrs[i++] = cur;
cur.starts_at_boundary = false;
}
}
return attrs;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static const char *
formatter_parse_mirc_color (struct formatter *self, const char *s)
{
uint8_t fg = 255, bg = 255;
s = irc_parse_mirc_color (s, &fg, &bg);
if (fg < 16)
FORMATTER_ADD_ITEM (self, FG_COLOR, .color = g_mirc_to_terminal[fg]);
else if (fg < 100)
FORMATTER_ADD_ITEM (self, FG_COLOR,
.color = COLOR_256 (DEFAULT, g_extra_to_256[fg - 16]));
if (bg < 16)
FORMATTER_ADD_ITEM (self, BG_COLOR, .color = g_mirc_to_terminal[bg]);
else if (bg < 100)
FORMATTER_ADD_ITEM (self, BG_COLOR,
.color = COLOR_256 (DEFAULT, g_extra_to_256[bg - 16]));
return s;
}
static void
formatter_parse_message (struct formatter *self, const char *s)
{
FORMATTER_ADD_RESET (self);
struct str buf = str_make ();
unsigned char c;
while ((c = *s++))
{
if (buf.len && c < 0x20)
{
FORMATTER_ADD_TEXT (self, buf.str);
str_reset (&buf);
}
int attribute = irc_parse_attribute (c);
if (c == '\x03')
s = formatter_parse_mirc_color (self, s);
else if (attribute > 0)
FORMATTER_ADD_ITEM (self, SIMPLE, .attribute = attribute);
else if (attribute < 0)
FORMATTER_ADD_RESET (self);
else
str_append_c (&buf, c);
}
if (buf.len)
FORMATTER_ADD_TEXT (self, buf.str);
str_free (&buf);
FORMATTER_ADD_RESET (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
formatter_parse_nick (struct formatter *self, const char *s)
{
// For outgoing messages; maybe we should add a special #t for them
// which would also make us not cut off the userhost part, ever
if (irc_is_channel (self->s, irc_skip_statusmsg (self->s, s)))
{
char *tmp = irc_to_utf8 (s);
FORMATTER_ADD_TEXT (self, tmp);
free (tmp);
return;
}
char *nick = irc_cut_nickname (s);
int color = siphash_wrapper (nick, strlen (nick)) % 7;
// Never use the black colour, could become transparent on black terminals;
// white is similarly excluded from the range
if (color == COLOR_BLACK)
color = (uint16_t) -1;
// Use a colour from the 256-colour cube if available
color |= self->ctx->nick_palette[siphash_wrapper (nick,
strlen (nick)) % self->ctx->nick_palette_len] << 16;
// We always use the default colour for ourselves
if (self->s && irc_is_this_us (self->s, nick))
color = -1;
FORMATTER_ADD_ITEM (self, FG_COLOR, .color = color);
char *x = irc_to_utf8 (nick);
free (nick);
FORMATTER_ADD_TEXT (self, x);
free (x);
// Need to reset the colour afterwards
FORMATTER_ADD_ITEM (self, FG_COLOR, .color = -1);
}
static void
formatter_parse_nick_full (struct formatter *self, const char *s)
{
formatter_parse_nick (self, s);
const char *userhost;
if (!(userhost = irc_find_userhost (s)))
return;
FORMATTER_ADD_TEXT (self, " (");
FORMATTER_ADD_ITEM (self, ATTR, .attribute = ATTR_USERHOST);
char *x = irc_to_utf8 (userhost);
FORMATTER_ADD_TEXT (self, x);
free (x);
FORMATTER_ADD_RESET (self);
FORMATTER_ADD_TEXT (self, ")");
}
static const char *
formatter_parse_field (struct formatter *self,
const char *field, struct str *buf, va_list *ap)
{
bool free_string = false;
char *s = NULL;
char *tmp = NULL;
int c;
restart:
switch ((c = *field++))
{
// We can push boring text content to the caller's buffer
// and let it flush the buffer only when it's actually needed
case 'd':
tmp = xstrdup_printf ("%d", va_arg (*ap, int));
str_append (buf, tmp);
free (tmp);
break;
case 's':
str_append (buf, (s = va_arg (*ap, char *)));
break;
case 'l':
if (!(tmp = iconv_xstrdup (self->ctx->term_to_utf8,
(s = va_arg (*ap, char *)), -1, NULL)))
print_error ("character conversion failed for: %s", "output");
else
str_append (buf, tmp);
free (tmp);
break;
case 'S':
tmp = irc_to_utf8 ((s = va_arg (*ap, char *)));
str_append (buf, tmp);
free (tmp);
break;
case 'm':
tmp = irc_to_utf8 ((s = va_arg (*ap, char *)));
formatter_parse_message (self, tmp);
free (tmp);
break;
case 'n':
formatter_parse_nick (self, (s = va_arg (*ap, char *)));
break;
case 'N':
formatter_parse_nick_full (self, (s = va_arg (*ap, char *)));
break;
case 'a':
FORMATTER_ADD_ITEM (self, ATTR, .attribute = va_arg (*ap, int));
break;
case 'c':
FORMATTER_ADD_ITEM (self, FG_COLOR, .color = va_arg (*ap, int));
break;
case 'C':
FORMATTER_ADD_ITEM (self, BG_COLOR, .color = va_arg (*ap, int));
break;
case 'r':
FORMATTER_ADD_RESET (self);
break;
default:
if (c == '&' && !free_string)
free_string = true;
else if (c)
hard_assert (!"unexpected format specifier");
else
hard_assert (!"unexpected end of format string");
goto restart;
}
if (free_string)
free (s);
return field;
}
// I was unable to take a pointer of a bare "va_list" when it was passed in
// as a function argument, so it has to be a pointer from the beginning
static void
formatter_addv (struct formatter *self, const char *format, va_list *ap)
{
struct str buf = str_make ();
while (*format)
{
if (*format != '#' || *++format == '#')
{
str_append_c (&buf, *format++);
continue;
}
if (buf.len)
{
FORMATTER_ADD_TEXT (self, buf.str);
str_reset (&buf);
}
format = formatter_parse_field (self, format, &buf, ap);
}
if (buf.len)
FORMATTER_ADD_TEXT (self, buf.str);
str_free (&buf);
}
static void
formatter_add (struct formatter *self, const char *format, ...)
{
va_list ap;
va_start (ap, format);
formatter_addv (self, format, &ap);
va_end (ap);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct line_char_attrs
{
short named; ///< Named attribute or -1
short text; ///< Text attributes
int fg; ///< Foreground colour (-1 for default)
int bg; ///< Background colour (-1 for default)
};
// We can get rid of the linked list and do this in one allocation (use strlen()
// for the upper bound)--since we only prepend and/or replace characters, add
// a member to specify the prepended character and how many times to repeat it.
// Tabs may nullify the wide character but it's not necessary.
//
// This would be slighly more optimal but it would also set the algorithm in
// stone and complicate flushing.
struct line_char
{
LIST_HEADER (struct line_char)
wchar_t wide; ///< The character as a wchar_t
int width; ///< Width of the character in cells
struct line_char_attrs attrs; ///< Attributes
};
static struct line_char *
line_char_new (wchar_t wc)
{
struct line_char *self = xcalloc (1, sizeof *self);
self->width = wcwidth ((self->wide = wc));
// Typically various control characters
if (self->width < 0)
self->width = 0;
self->attrs.bg = self->attrs.fg = -1;
self->attrs.named = ATTR_RESET;
return self;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct line_wrap_mark
{
struct line_char *start; ///< First character
int used; ///< Display cells used
};
static void
line_wrap_mark_push (struct line_wrap_mark *mark, struct line_char *c)
{
if (!mark->start)
mark->start = c;
mark->used += c->width;
}
struct line_wrap_state
{
struct line_char *result; ///< Head of result
struct line_char *result_tail; ///< Tail of result
int line_used; ///< Line length before marks
int line_max; ///< Maximum line length
struct line_wrap_mark chunk; ///< All buffered text
struct line_wrap_mark overflow; ///< Overflowing text
};
static void
line_wrap_flush_split (struct line_wrap_state *s, struct line_wrap_mark *before)
{
struct line_char *nl = line_char_new (L'\n');
LIST_INSERT_WITH_TAIL (s->result, s->result_tail, nl, before->start);
s->line_used = before->used;
}
static void
line_wrap_flush (struct line_wrap_state *s, bool force_split)
{
if (!s->overflow.start)
s->line_used += s->chunk.used;
else if (force_split || s->chunk.used > s->line_max)
{
#ifdef WRAP_UNNECESSARILY
// When the line wraps at the end of the screen and a background colour
// is set, the terminal paints the entire new line with that colour.
// Explicitly inserting a newline with the default attributes fixes it.
line_wrap_flush_split (s, &s->overflow);
#else
// Splitting here breaks link searching mechanisms in some terminals,
// though, so we make a trade-off and let the chunk wrap naturally.
// Fuck terminals, really.
s->line_used = s->overflow.used;
#endif
}
else
// Print the chunk in its entirety on a new line
line_wrap_flush_split (s, &s->chunk);
memset (&s->chunk, 0, sizeof s->chunk);
memset (&s->overflow, 0, sizeof s->overflow);
}
static void
line_wrap_nl (struct line_wrap_state *s)
{
line_wrap_flush (s, true);
struct line_char *nl = line_char_new (L'\n');
LIST_APPEND_WITH_TAIL (s->result, s->result_tail, nl);
s->line_used = 0;
}
static void
line_wrap_tab (struct line_wrap_state *s, struct line_char *c)
{
line_wrap_flush (s, true);
if (s->line_used >= s->line_max)
line_wrap_nl (s);
// Compute the number of characters needed to get to the next tab stop
int tab_width = ((s->line_used + 8) & ~7) - s->line_used;
// On overflow just fill the rest of the line with spaces
if (s->line_used + tab_width > s->line_max)
tab_width = s->line_max - s->line_used;
s->line_used += tab_width;
while (tab_width--)
{
struct line_char *space = line_char_new (L' ');
space->attrs = c->attrs;
LIST_APPEND_WITH_TAIL (s->result, s->result_tail, space);
}
}
static void
line_wrap_push_char (struct line_wrap_state *s, struct line_char *c)
{
// Note that when processing whitespace here, any non-WS chunk has already
// been flushed, and thus it matters little if we flush with force split
if (wcschr (L"\r\f\v", c->wide))
/* Skip problematic characters */;
else if (c->wide == L'\n')
line_wrap_nl (s);
else if (c->wide == L'\t')
line_wrap_tab (s, c);
else
goto use_as_is;
free (c);
return;
use_as_is:
if (s->overflow.start
|| s->line_used + s->chunk.used + c->width > s->line_max)
{
if (s->overflow.used + c->width > s->line_max)
{
#ifdef WRAP_UNNECESSARILY
// If the overflow overflows, restart on a new line
line_wrap_nl (s);
#else
// See line_wrap_flush(), we would end up on a new line anyway
line_wrap_flush (s, true);
s->line_used = 0;
#endif
}
else
line_wrap_mark_push (&s->overflow, c);
}
line_wrap_mark_push (&s->chunk, c);
LIST_APPEND_WITH_TAIL (s->result, s->result_tail, c);
}
/// Basic word wrapping that respects wcwidth(3) and expands tabs.
/// Besides making text easier to read, it also fixes the problem with
/// formatting spilling over the entire new line on line wrap.
static struct line_char *
line_wrap (struct line_char *line, int max_width)
{
struct line_wrap_state s = { .line_max = max_width };
bool last_was_word_char = false;
LIST_FOR_EACH (struct line_char, c, line)
{
// Act on the right boundary of (\s*\S+) chunks
bool this_is_word_char = !wcschr (L" \t\r\n\f\v", c->wide);
if (last_was_word_char && !this_is_word_char)
line_wrap_flush (&s, false);
last_was_word_char = this_is_word_char;
LIST_UNLINK (line, c);
line_wrap_push_char (&s, c);
}
// Make sure to process the last word and return the modified list
line_wrap_flush (&s, false);
return s.result;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct exploder
{
struct app_context *ctx; ///< Application context
struct line_char *result; ///< Result
struct line_char *result_tail; ///< Tail of result
struct line_char_attrs attrs; ///< Current attributes
};
static bool
explode_formatter_attr (struct exploder *self, struct formatter_item *item)
{
switch (item->type)
{
case FORMATTER_ITEM_ATTR:
self->attrs.named = item->attribute;
self->attrs.text = 0;
self->attrs.fg = -1;
self->attrs.bg = -1;
return true;
case FORMATTER_ITEM_SIMPLE:
self->attrs.named = -1;
self->attrs.text ^= item->attribute;
return true;
case FORMATTER_ITEM_FG_COLOR:
self->attrs.named = -1;
self->attrs.fg = item->color;
return true;
case FORMATTER_ITEM_BG_COLOR:
self->attrs.named = -1;
self->attrs.bg = item->color;
return true;
default:
return false;
}
}
static void
explode_text (struct exploder *self, const char *text)
{
// Throw away any potentially harmful control characters first
struct str filtered = str_make ();
for (const char *p = text; *p; p++)
if (!strchr ("\a\b\x0e\x0f\x1b" /* BEL BS SO SI ESC */, *p))
str_append_c (&filtered, *p);
size_t term_len = 0, processed = 0, len;
char *term = iconv_xstrdup (self->ctx->term_from_utf8,
filtered.str, filtered.len + 1, &term_len);
str_free (&filtered);
mbstate_t ps;
memset (&ps, 0, sizeof ps);
wchar_t wch;
while ((len = mbrtowc (&wch, term + processed, term_len - processed, &ps)))
{
hard_assert (len != (size_t) -2 && len != (size_t) -1);
hard_assert ((processed += len) <= term_len);
struct line_char *c = line_char_new (wch);
c->attrs = self->attrs;
LIST_APPEND_WITH_TAIL (self->result, self->result_tail, c);
}
free (term);
}
static struct line_char *
formatter_to_chars (struct formatter *formatter)
{
struct exploder self = { .ctx = formatter->ctx };
self.attrs.fg = self.attrs.bg = self.attrs.named = -1;
int attribute_ignore = 0;
for (size_t i = 0; i < formatter->items_len; i++)
{
struct formatter_item *iter = &formatter->items[i];
if (iter->type == FORMATTER_ITEM_TEXT)
explode_text (&self, iter->text);
else if (iter->type == FORMATTER_ITEM_IGNORE_ATTR)
attribute_ignore += iter->attribute;
else if (attribute_ignore <= 0
&& !explode_formatter_attr (&self, iter))
hard_assert (!"unhandled formatter item type");
}
return self.result;
}
enum
{
FLUSH_OPT_RAW = (1 << 0), ///< Print raw attributes
FLUSH_OPT_NOWRAP = (1 << 1) ///< Do not wrap
};
/// The input is a bunch of wide characters--respect shift state encodings
static void
formatter_putc (struct line_char *c, FILE *stream)
{
static mbstate_t mb;
char buf[MB_LEN_MAX] = {};
size_t len = wcrtomb (buf, c ? c->wide : L'\0', &mb);
if (len != (size_t) -1 && len)
fwrite (buf, len - !c, 1, stream);
free (c);
}
static void
formatter_flush (struct formatter *self, FILE *stream, int flush_opts)
{
struct line_char *line = formatter_to_chars (self);
bool is_tty = !!get_attribute_printer (stream);
if (!is_tty && !(flush_opts & FLUSH_OPT_RAW))
{
LIST_FOR_EACH (struct line_char, c, line)
formatter_putc (c, stream);
formatter_putc (NULL, stream);
return;
}
if (self->ctx->word_wrapping && !(flush_opts & FLUSH_OPT_NOWRAP))
line = line_wrap (line, g_terminal.columns);
struct attr_printer state = ATTR_PRINTER_INIT (self->ctx->theme, stream);
struct line_char_attrs attrs = {}; // Won't compare equal to anything
LIST_FOR_EACH (struct line_char, c, line)
{
if (attrs.fg != c->attrs.fg
|| attrs.bg != c->attrs.bg
|| attrs.named != c->attrs.named
|| attrs.text != c->attrs.text)
{
formatter_putc (NULL, stream);
attrs = c->attrs;
if (attrs.named == -1)
attr_printer_apply (&state, attrs.text, attrs.fg, attrs.bg);
else
attr_printer_apply_named (&state, attrs.named);
}
formatter_putc (c, stream);
}
formatter_putc (NULL, stream);
attr_printer_reset (&state);
}
// --- Buffers -----------------------------------------------------------------
static void
buffer_pop_excess_lines (struct app_context *ctx, struct buffer *self)
{
int to_delete = (int) self->lines_count - (int) ctx->backlog_limit;
while (to_delete-- > 0 && self->lines)
{
struct buffer_line *excess = self->lines;
LIST_UNLINK_WITH_TAIL (self->lines, self->lines_tail, excess);
buffer_line_destroy (excess);
self->lines_count--;
}
}
static void
on_config_backlog_limit_change (struct config_item *item)
{
struct app_context *ctx = item->user_data;
ctx->backlog_limit = MIN (item->value.integer, INT_MAX);
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
buffer_pop_excess_lines (ctx, iter);
}
static void
buffer_update_time (struct app_context *ctx, time_t now, FILE *stream,
int flush_opts)
{
struct tm last, current;
if (!localtime_r (&ctx->last_displayed_msg_time, &last)
|| !localtime_r (&now, &current))
{
// Strange but nonfatal
print_error ("%s: %s", "localtime_r", strerror (errno));
return;
}
ctx->last_displayed_msg_time = now;
if (last.tm_year == current.tm_year
&& last.tm_mon == current.tm_mon
&& last.tm_mday == current.tm_mday)
return;
char buf[64] = "";
const char *format =
get_config_string (ctx->config.root, "general.date_change_line");
if (!strftime (buf, sizeof buf, format, &current))
{
print_error ("%s: %s", "strftime", strerror (errno));
return;
}
struct formatter f = formatter_make (ctx, NULL);
formatter_add (&f, "#a#s\n", ATTR_DATE_CHANGE, buf);
formatter_flush (&f, stream, flush_opts);
// Flush the trailing formatting reset item
fflush (stream);
formatter_free (&f);
}
static void
buffer_line_flush (struct buffer_line *line, struct formatter *f, FILE *output,
int flush_opts)
{
switch (line->r)
{
case BUFFER_LINE_BARE: break;
case BUFFER_LINE_INDENT: formatter_add (f, " "); break;
case BUFFER_LINE_STATUS: formatter_add (f, " - "); break;
case BUFFER_LINE_ERROR: formatter_add (f, "#a=!=#r ", ATTR_ERROR); break;
case BUFFER_LINE_JOIN: formatter_add (f, "#a-->#r ", ATTR_JOIN); break;
case BUFFER_LINE_PART: formatter_add (f, "#a<--#r ", ATTR_PART); break;
case BUFFER_LINE_ACTION: formatter_add (f, " #a*#r ", ATTR_ACTION); break;
}
for (struct formatter_item *iter = line->items; iter->type; iter++)
formatter_add_item (f, *iter);
formatter_add (f, "\n");
formatter_flush (f, output, flush_opts);
formatter_free (f);
}
static void
buffer_line_write_time (struct formatter *f, struct buffer_line *line,
FILE *stream, int flush_opts)
{
// Normal timestamps don't include the date, make sure the user won't be
// confused as to when an event has happened
buffer_update_time (f->ctx, line->when, stream, flush_opts);
struct tm current;
char buf[9];
if (!localtime_r (&line->when, &current))
print_error ("%s: %s", "localtime_r", strerror (errno));
else if (!strftime (buf, sizeof buf, "%T", &current))
print_error ("%s: %s", "strftime", "buffer too small");
else
formatter_add (f, "#a#s#r ", ATTR_TIMESTAMP, buf);
}
#define buffer_line_will_show_up(buffer, line) \
(!(buffer)->hide_unimportant || !((line)->flags & BUFFER_LINE_UNIMPORTANT))
static void
buffer_line_display (struct app_context *ctx,
struct buffer *buffer, struct buffer_line *line, bool is_external)
{
if (!buffer_line_will_show_up (buffer, line))
return;
CALL (ctx->input, hide);
struct formatter f = formatter_make (ctx, NULL);
buffer_line_write_time (&f, line, stdout, 0);
// Ignore all formatting for messages coming from other buffers, that is
// either from the global or server buffer. Instead print them in grey.
if (is_external)
{
formatter_add (&f, "#a", ATTR_EXTERNAL);
FORMATTER_ADD_ITEM (&f, IGNORE_ATTR, .attribute = 1);
}
buffer_line_flush (line, &f, stdout, 0);
// Flush the trailing formatting reset item
fflush (stdout);
CALL (ctx->input, show);
}
static void
buffer_line_write_to_backlog (struct app_context *ctx,
struct buffer_line *line, FILE *log_file, int flush_opts)
{
struct formatter f = formatter_make (ctx, NULL);
buffer_line_write_time (&f, line, log_file, flush_opts);
buffer_line_flush (line, &f, log_file, flush_opts);
}
static void
buffer_line_write_to_log (struct app_context *ctx,
struct buffer_line *line, FILE *log_file)
{
if (line->flags & BUFFER_LINE_SKIP_FILE)
return;
struct formatter f = formatter_make (ctx, NULL);
struct tm current;
char buf[20];
if (!gmtime_r (&line->when, &current))
print_error ("%s: %s", "gmtime_r", strerror (errno));
else if (!strftime (buf, sizeof buf, "%F %T", &current))
print_error ("%s: %s", "strftime", "buffer too small");
else
formatter_add (&f, "#s ", buf);
// The target is not a terminal, thus it won't wrap in spite of the 0
buffer_line_flush (line, &f, log_file, 0);
}
static void
log_formatter (struct app_context *ctx, struct buffer *buffer,
unsigned flags, enum buffer_line_rendition r, struct formatter *f)
{
if (!buffer)
buffer = ctx->global_buffer;
struct buffer_line *line = buffer_line_new (f);
line->flags = flags;
line->r = r;
// TODO: allow providing custom time (IRCv3.2 server-time)
line->when = time (NULL);
buffer_pop_excess_lines (ctx, buffer);
LIST_APPEND_WITH_TAIL (buffer->lines, buffer->lines_tail, line);
buffer->lines_count++;
if (buffer->log_file)
buffer_line_write_to_log (ctx, line, buffer->log_file);
bool unseen_pm = buffer->type == BUFFER_PM
&& buffer != ctx->current_buffer
&& !(flags & BUFFER_LINE_UNIMPORTANT);
bool important = (flags & BUFFER_LINE_HIGHLIGHT) || unseen_pm;
if (ctx->beep_on_highlight && important)
// XXX: this may disturb any other foreground process
CALL (ctx->input, ding);
bool can_leak = false;
if ((buffer == ctx->global_buffer)
|| (ctx->current_buffer->type == BUFFER_GLOBAL
&& buffer->type == BUFFER_SERVER)
|| (ctx->current_buffer->type != BUFFER_GLOBAL
&& buffer == ctx->current_buffer->server->buffer))
can_leak = true;
relay_prepare_buffer_line (ctx, buffer, line,
buffer != ctx->current_buffer && !ctx->isolate_buffers && can_leak);
relay_broadcast (ctx);
bool displayed = true;
if (ctx->terminal_suspended > 0)
// Another process is using the terminal
displayed = false;
else if (buffer == ctx->current_buffer)
buffer_line_display (ctx, buffer, line, false);
else if (!ctx->isolate_buffers && can_leak)
buffer_line_display (ctx, buffer, line, true);
else
displayed = false;
// Advance the unread marker in active buffers but don't create a new one
if (!displayed
|| (buffer == ctx->current_buffer && buffer->new_messages_count))
{
buffer->new_messages_count++;
if (flags & BUFFER_LINE_UNIMPORTANT)
buffer->new_unimportant_count++;
buffer->highlighted |= important;
}
if (!displayed)
refresh_prompt (ctx);
}
static void
log_full (struct app_context *ctx, struct server *s, struct buffer *buffer,
unsigned flags, enum buffer_line_rendition r, const char *format, ...)
{
va_list ap;
va_start (ap, format);
struct formatter f = formatter_make (ctx, s);
formatter_addv (&f, format, &ap);
log_formatter (ctx, buffer, flags, r, &f);
va_end (ap);
}
#define log_global(ctx, flags, r, ...) \
log_full ((ctx), NULL, (ctx)->global_buffer, (flags), (r), __VA_ARGS__)
#define log_server(s, buffer, flags, r, ...) \
log_full ((s)->ctx, (s), (buffer), (flags), (r), __VA_ARGS__)
#define log_global_status(ctx, ...) \
log_global ((ctx), 0, BUFFER_LINE_STATUS, __VA_ARGS__)
#define log_global_error(ctx, ...) \
log_global ((ctx), 0, BUFFER_LINE_ERROR, __VA_ARGS__)
#define log_global_indent(ctx, ...) \
log_global ((ctx), 0, BUFFER_LINE_INDENT, __VA_ARGS__)
#define log_server_status(s, buffer, ...) \
log_server ((s), (buffer), 0, BUFFER_LINE_STATUS, __VA_ARGS__)
#define log_server_error(s, buffer, ...) \
log_server ((s), (buffer), 0, BUFFER_LINE_ERROR, __VA_ARGS__)
#define log_global_debug(ctx, ...) \
BLOCK_START \
if (g_debug_mode) \
log_global ((ctx), 0, 0, "(*) " __VA_ARGS__); \
BLOCK_END
#define log_server_debug(s, ...) \
BLOCK_START \
if (g_debug_mode) \
log_server ((s), (s)->buffer, 0, 0, "(*) " __VA_ARGS__); \
BLOCK_END
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Lines that are used in more than one place
#define log_nick_self(s, buffer, new_) \
log_server ((s), (buffer), BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_STATUS, \
"You are now known as #n", (new_))
#define log_nick(s, buffer, old, new_) \
log_server ((s), (buffer), BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_STATUS, \
"#n is now known as #n", (old), (new_))
#define log_chghost_self(s, buffer, new_) \
log_server ((s), (buffer), BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_STATUS, \
"You are now #N", (new_))
#define log_chghost(s, buffer, old, new_) \
log_server ((s), (buffer), BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_STATUS, \
"#N is now #N", (old), (new_))
#define log_outcoming_notice(s, buffer, who, text) \
log_server_status ((s), (buffer), "#s(#n): #m", "Notice", (who), (text))
#define log_outcoming_privmsg(s, buffer, prefixes, who, text) \
log_server ((s), (buffer), 0, 0, "<#s#n> #m", (prefixes), (who), (text))
#define log_outcoming_action(s, buffer, who, text) \
log_server ((s), (buffer), 0, BUFFER_LINE_ACTION, "#n #m", (who), (text))
#define log_outcoming_orphan_notice(s, target, text) \
log_server_status ((s), (s)->buffer, "Notice -> #n: #m", (target), (text))
#define log_outcoming_orphan_privmsg(s, target, text) \
log_server ((s), (s)->buffer, 0, BUFFER_LINE_STATUS, \
"MSG(#n): #m", (target), (text))
#define log_outcoming_orphan_action(s, target, text) \
log_server ((s), (s)->buffer, 0, BUFFER_LINE_ACTION, \
"MSG(#n): #m", (target), (text))
#define log_ctcp_query(s, target, tag) \
log_server_status ((s), (s)->buffer, "CTCP query to #S: #S", target, tag)
#define log_ctcp_reply(s, target, reply /* freed! */) \
log_server_status ((s), (s)->buffer, "CTCP reply to #S: #&S", target, reply)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
make_log_filename (const char *filename, struct str *output)
{
for (const char *p = filename; *p; p++)
// XXX: anything more to replace?
if (strchr ("/\\ ", *p))
str_append_c (output, '_');
else
str_append_c (output, tolower_ascii (*p));
}
static char *
buffer_get_log_path (struct buffer *buffer)
{
struct str path = str_make ();
get_xdg_home_dir (&path, "XDG_DATA_HOME", ".local/share");
str_append_printf (&path, "/%s/%s", PROGRAM_NAME, "logs");
(void) mkdir_with_parents (path.str, NULL);
str_append_c (&path, '/');
// FIXME: This mixes up character encodings.
make_log_filename (buffer->name, &path);
str_append (&path, ".log");
return str_steal (&path);
}
static void
buffer_open_log_file (struct app_context *ctx, struct buffer *buffer)
{
if (!ctx->logging || buffer->log_file)
return;
// TODO: should we try to reopen files wrt. case mapping?
// - Need to read the whole directory and look for matches:
// irc_server_strcmp(buffer->s, d_name, make_log_filename())
// remember to strip the ".log" suffix from d_name, case-sensitively.
// - The tolower_ascii() in make_log_filename() is a perfect overlap,
// it may stay as-is.
// - buffer_get_log_path() will need to return a FILE *,
// or an error that includes the below message.
char *path = buffer_get_log_path (buffer);
if (!(buffer->log_file = fopen (path, "ab")))
log_global_error (ctx, "Couldn't open log file `#l': #l",
path, strerror (errno));
else
set_cloexec (fileno (buffer->log_file));
free (path);
}
static void
buffer_close_log_file (struct buffer *buffer)
{
if (buffer->log_file)
(void) fclose (buffer->log_file);
buffer->log_file = NULL;
}
static void
on_config_logging_change (struct config_item *item)
{
struct app_context *ctx = item->user_data;
ctx->logging = item->value.boolean;
for (struct buffer *buffer = ctx->buffers; buffer; buffer = buffer->next)
if (ctx->logging)
buffer_open_log_file (ctx, buffer);
else
buffer_close_log_file (buffer);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static struct buffer *
buffer_by_name (struct app_context *ctx, const char *name)
{
return str_map_find (&ctx->buffers_by_name, name);
}
static void
buffer_add (struct app_context *ctx, struct buffer *buffer)
{
hard_assert (!buffer_by_name (ctx, buffer->name));
relay_prepare_buffer_update (ctx, buffer);
relay_broadcast (ctx);
str_map_set (&ctx->buffers_by_name, buffer->name, buffer);
LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
buffer_open_log_file (ctx, buffer);
// Normally this doesn't cause changes in the prompt but a prompt hook
// could decide to show some information for all buffers nonetheless
refresh_prompt (ctx);
}
static void
buffer_remove (struct app_context *ctx, struct buffer *buffer)
{
hard_assert (buffer != ctx->current_buffer);
hard_assert (buffer != ctx->global_buffer);
relay_prepare_buffer_remove (ctx, buffer);
relay_broadcast (ctx);
CALL_ (ctx->input, buffer_destroy, buffer->input_data);
buffer->input_data = NULL;
// And make sure to unlink the buffer from "irc_buffer_map"
struct server *s = buffer->server;
if (buffer->channel)
str_map_set (&s->irc_buffer_map, buffer->channel->name, NULL);
if (buffer->user)
str_map_set (&s->irc_buffer_map, buffer->user->nickname, NULL);
if (buffer == ctx->last_buffer)
ctx->last_buffer = NULL;
if (buffer->type == BUFFER_SERVER)
buffer->server->buffer = NULL;
str_map_set (&ctx->buffers_by_name, buffer->name, NULL);
LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
buffer_unref (buffer);
refresh_prompt (ctx);
}
static void
buffer_print_read_marker (struct app_context *ctx, FILE *stream, int flush_opts)
{
struct formatter f = formatter_make (ctx, NULL);
const int timestamp_width = 8; // hardcoded to %T right now, simple
const char *marker_char =
get_config_string (ctx->config.root, "general.read_marker_char");
// We could turn this off on FLUSH_OPT_NOWRAP, however our default pager
// wraps lines for us even if we don't do it ourselves, and thus there's
// no need to worry about inconsistency.
if (*marker_char)
{
struct str s = str_make ();
for (int i = 0; i < timestamp_width; i++)
str_append (&s, marker_char);
formatter_add (&f, "#a#s#r", ATTR_TIMESTAMP, s.str);
str_reset (&s);
for (int i = timestamp_width; i < g_terminal.columns; i++)
str_append (&s, marker_char);
formatter_add (&f, "#a#s#r\n", ATTR_READ_MARKER, s.str);
str_free (&s);
}
else
formatter_add (&f, "#a-- -- -- ---\n", ATTR_READ_MARKER);
formatter_flush (&f, stream, flush_opts);
// Flush the trailing formatting reset item
fflush (stream);
formatter_free (&f);
}
static void
buffer_print_backlog (struct app_context *ctx, struct buffer *buffer)
{
// Buffers can be activated, or their lines modified, as automatic actions.
if (ctx->terminal_suspended)
return;
// The prompt can take considerable time to redraw
CALL (ctx->input, hide);
// Simulate curses-like fullscreen buffers if the terminal allows it
if (g_terminal.initialized && clear_screen)
{
terminal_printer_fn printer = get_attribute_printer (stdout);
tputs (clear_screen, 1, printer);
if (cursor_to_ll)
tputs (cursor_to_ll, 1, printer);
else if (row_address)
tputs (tparm (row_address, g_terminal.lines - 1,
0, 0, 0, 0, 0, 0, 0, 0), 1, printer);
else if (cursor_address)
tputs (tparm (cursor_address, g_terminal.lines - 1,
0, 0, 0, 0, 0, 0, 0, 0), 1, printer);
fflush (stdout);
// We should update "last_displayed_msg_time" here just to be sure
// that the first date marker, if necessary, is shown, but in practice
// the value should always be from today when this function is called
}
else
{
char *buffer_name_localized =
iconv_xstrdup (ctx->term_from_utf8, buffer->name, -1, NULL);
print_status ("%s", buffer_name_localized);
free (buffer_name_localized);
}
// That is, minus the readline prompt (taking at least one line)
int display_limit = MAX (10, g_terminal.lines - 1);
int to_display = 0;
struct buffer_line *line;
for (line = buffer->lines_tail; line; line = line->prev)
{
to_display++;
if (buffer_line_will_show_up (buffer, line))
display_limit--;
if (!line->prev || display_limit <= 0)
break;
}
// Once we've found where we want to start with the backlog, print it
int until_marker = to_display - (int) buffer->new_messages_count;
for (; line; line = line->next)
{
if (until_marker-- == 0
&& buffer->new_messages_count != buffer->lines_count)
buffer_print_read_marker (ctx, stdout, 0);
buffer_line_display (ctx, buffer, line, 0);
}
// So that it is obvious if the last line in the buffer is not from today
buffer_update_time (ctx, time (NULL), stdout, 0);
refresh_prompt (ctx);
CALL (ctx->input, show);
}
static void
buffer_activate (struct app_context *ctx, struct buffer *buffer)
{
if (ctx->current_buffer == buffer)
return;
relay_prepare_buffer_activate (ctx, buffer);
relay_broadcast (ctx);
// This is the only place where the unread messages marker
// and highlight indicator are reset
if (ctx->current_buffer)
{
ctx->current_buffer->new_messages_count = 0;
ctx->current_buffer->new_unimportant_count = 0;
ctx->current_buffer->highlighted = false;
}
buffer_print_backlog (ctx, buffer);
CALL_ (ctx->input, buffer_switch, buffer->input_data);
// Now at last we can switch the pointers
ctx->last_buffer = ctx->current_buffer;
ctx->current_buffer = buffer;
refresh_prompt (ctx);
}
static void
buffer_merge (struct app_context *ctx,
struct buffer *buffer, struct buffer *merged)
{
// XXX: anything better to do? This situation is arguably rare and I'm
// not entirely sure what action to take.
log_full (ctx, NULL, buffer, 0, BUFFER_LINE_STATUS,
"Buffer #s was merged into this buffer", merged->name);
// Find all lines from "merged" newer than the newest line in "buffer"
struct buffer_line *start = merged->lines;
if (buffer->lines_tail)
while (start && start->when < buffer->lines_tail->when)
start = start->next;
if (!start)
return;
// Count how many of them we have
size_t n = 0;
for (struct buffer_line *iter = start; iter; iter = iter->next)
n++;
struct buffer_line *tail = merged->lines_tail;
// Cut them from the original buffer
if (start == merged->lines)
merged->lines = NULL;
else if (start->prev)
start->prev->next = NULL;
merged->lines_tail = start->prev;
merged->lines_count -= n;
// Append them to current lines in the buffer
buffer->lines_tail->next = start;
start->prev = buffer->lines_tail;
buffer->lines_tail = tail;
buffer->lines_count += n;
// And since there is no log_*() call, send them to relays manually
buffer->highlighted |= merged->highlighted;
LIST_FOR_EACH (struct buffer_line, line, start)
{
if (buffer->new_messages_count)
{
buffer->new_messages_count++;
if (line->flags & BUFFER_LINE_UNIMPORTANT)
buffer->new_unimportant_count++;
}
relay_prepare_buffer_line (ctx, buffer, line, false);
relay_broadcast (ctx);
}
log_full (ctx, NULL, buffer, BUFFER_LINE_SKIP_FILE, BUFFER_LINE_STATUS,
"End of merged content");
}
static void
buffer_rename (struct app_context *ctx,
struct buffer *buffer, const char *new_name)
{
struct buffer *collision = str_map_find (&ctx->buffers_by_name, new_name);
if (collision == buffer)
return;
hard_assert (!collision);
relay_prepare_buffer_rename (ctx, buffer, new_name);
relay_broadcast (ctx);
str_map_set (&ctx->buffers_by_name, buffer->name, NULL);
str_map_set (&ctx->buffers_by_name, new_name, buffer);
cstr_set (&buffer->name, xstrdup (new_name));
buffer_close_log_file (buffer);
buffer_open_log_file (ctx, buffer);
// We might have renamed the current buffer
refresh_prompt (ctx);
}
static void
buffer_clear (struct app_context *ctx, struct buffer *buffer)
{
relay_prepare_buffer_clear (ctx, buffer);
relay_broadcast (ctx);
LIST_FOR_EACH (struct buffer_line, iter, buffer->lines)
buffer_line_destroy (iter);
buffer->lines = buffer->lines_tail = NULL;
buffer->lines_count = 0;
}
static void
buffer_toggle_unimportant (struct app_context *ctx, struct buffer *buffer)
{
buffer->hide_unimportant ^= true;
relay_prepare_buffer_update (ctx, buffer);
relay_broadcast (ctx);
if (buffer == ctx->current_buffer)
buffer_print_backlog (ctx, buffer);
}
static struct buffer *
buffer_at_index (struct app_context *ctx, int n)
{
int i = 0;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
if (++i == n)
return iter;
return NULL;
}
static struct buffer *
buffer_next (struct app_context *ctx, int count)
{
struct buffer *new_buffer = ctx->current_buffer;
while (count-- > 0)
if (!(new_buffer = new_buffer->next))
new_buffer = ctx->buffers;
return new_buffer;
}
static struct buffer *
buffer_previous (struct app_context *ctx, int count)
{
struct buffer *new_buffer = ctx->current_buffer;
while (count-- > 0)
if (!(new_buffer = new_buffer->prev))
new_buffer = ctx->buffers_tail;
return new_buffer;
}
static bool
buffer_goto (struct app_context *ctx, int n)
{
struct buffer *buffer = buffer_at_index (ctx, n);
if (!buffer)
return false;
buffer_activate (ctx, buffer);
return true;
}
static int
buffer_count (struct app_context *ctx)
{
int total = 0;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
total++;
return total;
}
static void
buffer_move (struct app_context *ctx, struct buffer *buffer, int n)
{
hard_assert (n >= 1 && n <= buffer_count (ctx));
LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
struct buffer *following = ctx->buffers;
while (--n && following)
following = following->next;
LIST_INSERT_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer, following);
refresh_prompt (ctx);
}
static int
buffer_get_index (struct app_context *ctx, struct buffer *buffer)
{
int index = 1;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
{
if (iter == buffer)
return index;
index++;
}
return -1;
}
static void
buffer_remove_safe (struct app_context *ctx, struct buffer *buffer)
{
if (buffer == ctx->current_buffer)
buffer_activate (ctx, ctx->last_buffer
? ctx->last_buffer
: buffer_next (ctx, 1));
buffer_remove (ctx, buffer);
}
static void
init_global_buffer (struct app_context *ctx)
{
struct buffer *global = ctx->global_buffer =
buffer_new (ctx->input, BUFFER_GLOBAL, xstrdup (PROGRAM_NAME));
buffer_add (ctx, global);
buffer_activate (ctx, global);
}
// --- Users, channels ---------------------------------------------------------
static char *
irc_make_buffer_name (struct server *s, const char *target)
{
if (!target)
return xstrdup (s->name);
char *target_utf8 = irc_to_utf8 (target);
char *name = xstrdup_printf ("%s.%s", s->name, target_utf8);
free (target_utf8);
struct buffer *conflict = buffer_by_name (s->ctx, name);
if (!conflict)
return name;
hard_assert (conflict->server == s);
// Fix up any conflicts. Note that while parentheses aren't allowed
// in IRC nicknames, they may occur in channel names.
int i = 0;
char *unique = xstrdup_printf ("%s(%d)", name, ++i);
while (buffer_by_name (s->ctx, unique))
cstr_set (&unique, xstrdup_printf ("%s(%d)", name, ++i));
free (name);
return unique;
}
static void
irc_user_on_destroy (void *object, void *user_data)
{
struct user *user = object;
struct server *s = user_data;
if (!s->rehashing)
str_map_set (&s->irc_users, user->nickname, NULL);
}
static struct user *
irc_make_user (struct server *s, char *nickname)
{
hard_assert (!str_map_find (&s->irc_users, nickname));
struct user *user = user_new (nickname);
(void) user_weak_ref (user, irc_user_on_destroy, s);
str_map_set (&s->irc_users, user->nickname, user);
return user;
}
struct user *
irc_get_or_make_user (struct server *s, const char *nickname)
{
struct user *user = str_map_find (&s->irc_users, nickname);
if (user)
return user_ref (user);
return irc_make_user (s, xstrdup (nickname));
}
static struct buffer *
irc_get_or_make_user_buffer (struct server *s, const char *nickname)
{
struct buffer *buffer = str_map_find (&s->irc_buffer_map, nickname);
if (buffer)
return buffer;
struct user *user = irc_get_or_make_user (s, nickname);
// Open a new buffer for the user
buffer = buffer_new (s->ctx->input,
BUFFER_PM, irc_make_buffer_name (s, nickname));
buffer->server = s;
buffer->user = user;
str_map_set (&s->irc_buffer_map, user->nickname, buffer);
buffer_add (s->ctx, buffer);
return buffer;
}
static void
irc_get_channel_user_prefix (struct server *s,
struct channel_user *channel_user, struct str *output)
{
if (s->ctx->show_all_prefixes)
str_append (output, channel_user->prefixes);
else if (channel_user->prefixes[0])
str_append_c (output, channel_user->prefixes[0]);
}
static bool
irc_channel_is_joined (struct channel *channel)
{
// TODO: find a better way of checking if we're on a channel
return !!channel->users_len;
}
// Note that this eats the user reference
static void
irc_channel_link_user (struct channel *channel, struct user *user,
const char *prefixes)
{
struct user_channel *user_channel = user_channel_new (channel);
LIST_PREPEND (user->channels, user_channel);
struct channel_user *channel_user = channel_user_new (user, prefixes);
LIST_PREPEND (channel->users, channel_user);
channel->users_len++;
}
static void
irc_channel_unlink_user
(struct channel *channel, struct channel_user *channel_user)
{
// First destroy the user's weak references to the channel
struct user *user = channel_user->user;
LIST_FOR_EACH (struct user_channel, iter, user->channels)
if (iter->channel == channel)
{
LIST_UNLINK (user->channels, iter);
user_channel_destroy (iter);
}
// TODO: poll the away status for users we don't share a channel with.
// It might or might not be worth to auto-set this on with RPL_AWAY.
if (!user->channels && user != channel->s->irc_user)
user->away = false;
// Then just unlink the user from the channel
LIST_UNLINK (channel->users, channel_user);
channel_user_destroy (channel_user);
channel->users_len--;
}
static void
irc_channel_on_destroy (void *object, void *user_data)
{
struct channel *channel = object;
struct server *s = user_data;
LIST_FOR_EACH (struct channel_user, iter, channel->users)
irc_channel_unlink_user (channel, iter);
if (!s->rehashing)
str_map_set (&s->irc_channels, channel->name, NULL);
}
static struct channel *
irc_make_channel (struct server *s, char *name)
{
hard_assert (!str_map_find (&s->irc_channels, name));
struct channel *channel = channel_new (s, name);
(void) channel_weak_ref (channel, irc_channel_on_destroy, s);
str_map_set (&s->irc_channels, channel->name, channel);
return channel;
}
static struct channel_user *
irc_channel_get_user (struct channel *channel, struct user *user)
{
LIST_FOR_EACH (struct channel_user, iter, channel->users)
if (iter->user == user)
return iter;
return NULL;
}
static void
irc_remove_user_from_channel (struct user *user, struct channel *channel)
{
struct channel_user *channel_user = irc_channel_get_user (channel, user);
if (channel_user)
irc_channel_unlink_user (channel, channel_user);
}
static void
irc_left_channel (struct channel *channel)
{
strv_reset (&channel->names_buf);
channel->show_names_after_who = false;
LIST_FOR_EACH (struct channel_user, iter, channel->users)
irc_channel_unlink_user (channel, iter);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
remove_conflicting_buffer (struct server *s, struct buffer *buffer)
{
log_server_status (s, s->buffer,
"Removed buffer #s because of casemapping conflict", buffer->name);
if (s->ctx->current_buffer == buffer)
buffer_activate (s->ctx, s->buffer);
buffer_remove (s->ctx, buffer);
}
static void
irc_try_readd_user (struct server *s,
struct user *user, struct buffer *buffer)
{
if (str_map_find (&s->irc_users, user->nickname))
{
// Remove user from all channels and destroy any PM buffer
user_ref (user);
LIST_FOR_EACH (struct user_channel, iter, user->channels)
irc_remove_user_from_channel (user, iter->channel);
if (buffer)
remove_conflicting_buffer (s, buffer);
user_unref (user);
}
else
{
str_map_set (&s->irc_users, user->nickname, user);
str_map_set (&s->irc_buffer_map, user->nickname, buffer);
}
}
static void
irc_try_readd_channel (struct channel *channel, struct buffer *buffer)
{
struct server *s = channel->s;
if (str_map_find (&s->irc_channels, channel->name))
{
// Remove all users from channel and destroy any channel buffer
channel_ref (channel);
LIST_FOR_EACH (struct channel_user, iter, channel->users)
irc_channel_unlink_user (channel, iter);
if (buffer)
remove_conflicting_buffer (s, buffer);
channel_unref (channel);
}
else
{
str_map_set (&s->irc_channels, channel->name, channel);
str_map_set (&s->irc_buffer_map, channel->name, buffer);
}
}
static void
irc_rehash_and_fix_conflicts (struct server *s)
{
// Save the old maps and initialize new ones
struct str_map old_users = s->irc_users;
struct str_map old_channels = s->irc_channels;
struct str_map old_buffer_map = s->irc_buffer_map;
s->irc_users = str_map_make (NULL);
s->irc_channels = str_map_make (NULL);
s->irc_buffer_map = str_map_make (NULL);
s->irc_users .key_xfrm = s->irc_strxfrm;
s->irc_channels .key_xfrm = s->irc_strxfrm;
s->irc_buffer_map.key_xfrm = s->irc_strxfrm;
// Prevent channels and users from unsetting themselves
// from server maps upon removing the last reference to them
s->rehashing = true;
// XXX: to be perfectly sure, we should also check
// whether any users collide with channels and vice versa
// Our own user always takes priority, add him first
if (s->irc_user)
irc_try_readd_user (s, s->irc_user,
str_map_find (&old_buffer_map, s->irc_user->nickname));
struct str_map_iter iter;
struct user *user;
struct channel *channel;
iter = str_map_iter_make (&old_users);
while ((user = str_map_iter_next (&iter)))
irc_try_readd_user (s, user,
str_map_find (&old_buffer_map, user->nickname));
iter = str_map_iter_make (&old_channels);
while ((channel = str_map_iter_next (&iter)))
irc_try_readd_channel (channel,
str_map_find (&old_buffer_map, channel->name));
// Hopefully we've either moved or destroyed all the old content
s->rehashing = false;
str_map_free (&old_users);
str_map_free (&old_channels);
str_map_free (&old_buffer_map);
}
static void
irc_set_casemapping (struct server *s,
irc_tolower_fn tolower, irc_strxfrm_fn strxfrm)
{
if (tolower == s->irc_tolower
&& strxfrm == s->irc_strxfrm)
return;
s->irc_tolower = tolower;
s->irc_strxfrm = strxfrm;
// Ideally we would never have to do this but I can't think of a workaround
irc_rehash_and_fix_conflicts (s);
}
// --- Core functionality ------------------------------------------------------
static bool
irc_is_connected (struct server *s)
{
return s->state != IRC_DISCONNECTED && s->state != IRC_CONNECTING;
}
static void
irc_update_poller (struct server *s, const struct pollfd *pfd)
{
int new_events = s->transport->get_poll_events (s);
hard_assert (new_events != 0);
if (!pfd || pfd->events != new_events)
poller_fd_set (&s->socket_event, new_events);
}
static void
irc_cancel_timers (struct server *s)
{
poller_timer_reset (&s->timeout_tmr);
poller_timer_reset (&s->ping_tmr);
poller_timer_reset (&s->reconnect_tmr);
poller_timer_reset (&s->autojoin_tmr);
}
static void
irc_reset_connection_timeouts (struct server *s)
{
poller_timer_set (&s->timeout_tmr, 3 * 60 * 1000);
poller_timer_set (&s->ping_tmr, (3 * 60 + 30) * 1000);
poller_timer_reset (&s->reconnect_tmr);
}
static int64_t
irc_get_reconnect_delay (struct server *s)
{
int64_t delay = get_config_integer (s->config, "reconnect_delay");
int64_t delay_factor = get_config_integer
(s->ctx->config.root, "general.reconnect_delay_growing");
for (unsigned i = 0; i < s->reconnect_attempt; i++)
{
if (delay_factor && delay > INT64_MAX / delay_factor)
break;
delay *= delay_factor;
}
int64_t delay_max =
get_config_integer (s->ctx->config.root, "general.reconnect_delay_max");
return MIN (delay, delay_max);
}
static void
irc_queue_reconnect (struct server *s)
{
// As long as the user wants us to, that is
if (!get_config_boolean (s->config, "reconnect"))
return;
// XXX: maybe add a state for when a connect is queued?
hard_assert (s->state == IRC_DISCONNECTED);
int64_t delay = irc_get_reconnect_delay (s);
s->reconnect_attempt++;
log_server_status (s, s->buffer,
"Trying to reconnect in #&s seconds...",
xstrdup_printf ("%" PRId64, delay));
poller_timer_set (&s->reconnect_tmr, delay * 1000);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void irc_process_sent_message
(const struct irc_message *msg, struct server *s);
static void irc_send (struct server *s,
const char *format, ...) ATTRIBUTE_PRINTF (2, 3);
static void
irc_send (struct server *s, const char *format, ...)
{
if (!soft_assert (irc_is_connected (s)))
{
log_server_debug (s, "sending a message to a dead server connection");
return;
}
if (s->state == IRC_CLOSING
|| s->state == IRC_HALF_CLOSED)
return;
va_list ap;
va_start (ap, format);
struct str str = str_make ();
str_append_vprintf (&str, format, ap);
va_end (ap);
log_server_debug (s, "#a<< \"#S\"#r", ATTR_PART, str.str);
struct irc_message msg;
irc_parse_message (&msg, str.str);
irc_process_sent_message (&msg, s);
irc_free_message (&msg);
str_append_str (&s->write_buffer, &str);
str_free (&str);
str_append (&s->write_buffer, "\r\n");
irc_update_poller (s, NULL);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
irc_set_state (struct server *s, enum server_state state)
{
s->state = state;
relay_prepare_server_update (s->ctx, s);
relay_broadcast (s->ctx);
refresh_prompt (s->ctx);
}
static void
irc_real_shutdown (struct server *s)
{
hard_assert (irc_is_connected (s) && s->state != IRC_HALF_CLOSED);
if (s->transport
&& s->transport->in_before_shutdown)
s->transport->in_before_shutdown (s);
while (shutdown (s->socket, SHUT_WR) == -1)
// XXX: we get ENOTCONN with OpenSSL (not plain) when a localhost
// server is aborted, why? strace says read 0, write 31, shutdown -1.
if (!soft_assert (errno == EINTR))
break;
irc_set_state (s, IRC_HALF_CLOSED);
}
static void
irc_shutdown (struct server *s)
{
if (s->state == IRC_CLOSING
|| s->state == IRC_HALF_CLOSED)
return;
// TODO: set a timer to cut the connection if we don't receive an EOF
irc_set_state (s, IRC_CLOSING);
// Either there's still some data in the write buffer and we wait
// until they're sent, or we send an EOF to the server right away
if (!s->write_buffer.len)
irc_real_shutdown (s);
}
static void
irc_destroy_connector (struct server *s)
{
if (s->connector)
connector_free (s->connector);
free (s->connector);
s->connector = NULL;
if (s->socks_conn)
socks_connector_free (s->socks_conn);
free (s->socks_conn);
s->socks_conn = NULL;
// Not connecting anymore
irc_set_state (s, IRC_DISCONNECTED);
}
static void
try_finish_quit (struct app_context *ctx)
{
if (!ctx->quitting)
return;
bool disconnected_all = true;
struct str_map_iter iter = str_map_iter_make (&ctx->servers);
struct server *s;
while ((s = str_map_iter_next (&iter)))
if (irc_is_connected (s))
disconnected_all = false;
if (disconnected_all)
ctx->polling = false;
}
static void
irc_destroy_transport (struct server *s)
{
if (s->transport
&& s->transport->cleanup)
s->transport->cleanup (s);
s->transport = NULL;
poller_fd_reset (&s->socket_event);
xclose (s->socket);
s->socket = -1;
irc_set_state (s, IRC_DISCONNECTED);
str_reset (&s->read_buffer);
str_reset (&s->write_buffer);
}
static void
irc_destroy_state (struct server *s)
{
struct str_map_iter iter = str_map_iter_make (&s->irc_channels);
struct channel *channel;
while ((channel = str_map_iter_next (&iter)))
irc_left_channel (channel);
if (s->irc_user)
{
user_unref (s->irc_user);
s->irc_user = NULL;
}
str_reset (&s->irc_user_mode);
cstr_set (&s->irc_user_host, NULL);
strv_reset (&s->outstanding_joins);
strv_reset (&s->cap_ls_buf);
s->cap_away_notify = false;
s->cap_echo_message = false;
s->cap_sasl = false;
// Need to call this before server_init_specifics()
irc_set_casemapping (s, irc_tolower, irc_strxfrm);
server_free_specifics (s);
server_init_specifics (s);
}
static void
irc_disconnect (struct server *s)
{
hard_assert (irc_is_connected (s));
struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
struct buffer *buffer;
while ((buffer = str_map_iter_next (&iter)))
log_server (s, buffer, BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_STATUS,
"Disconnected from server");
irc_cancel_timers (s);
irc_destroy_transport (s);
irc_destroy_state (s);
// Take any relevant actions
if (s->ctx->quitting)
try_finish_quit (s->ctx);
else if (s->manual_disconnect)
s->manual_disconnect = false;
else
{
s->reconnect_attempt = 0;
irc_queue_reconnect (s);
}
}
static void
irc_initiate_disconnect (struct server *s, const char *reason)
{
hard_assert (irc_is_connected (s));
// It can take a very long time for sending QUIT to take effect
if (s->manual_disconnect)
{
log_server_error (s, s->buffer, "#s: #s", "Disconnected from server",
"connection torn down early per user request");
irc_disconnect (s);
return;
}
if (reason)
irc_send (s, "QUIT :%s", reason);
else
// TODO: make the default QUIT message customizable
// -> global/per server/both?
// -> implement it with an output hook in a plugin?
irc_send (s, "QUIT :%s", PROGRAM_NAME " " PROGRAM_VERSION);
s->manual_disconnect = true;
irc_shutdown (s);
}
static void
request_quit (struct app_context *ctx, const char *message)
{
if (!ctx->quitting)
{
log_global_status (ctx, "Shutting down");
ctx->quitting = true;
// Disable the user interface
CALL (ctx->input, hide);
}
struct str_map_iter iter = str_map_iter_make (&ctx->servers);
struct server *s;
while ((s = str_map_iter_next (&iter)))
{
// There may be a timer set to reconnect to the server
poller_timer_reset (&s->reconnect_tmr);
if (irc_is_connected (s))
irc_initiate_disconnect (s, message);
else if (s->state == IRC_CONNECTING)
irc_destroy_connector (s);
}
try_finish_quit (ctx);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
on_irc_ping_timeout (void *user_data)
{
struct server *s = user_data;
log_server_error (s, s->buffer,
"#s: #s", "Disconnected from server", "timeout");
irc_disconnect (s);
}
static void
on_irc_timeout (void *user_data)
{
// Provoke a response from the server
struct server *s = user_data;
irc_send (s, "PING :%" PRIi64, (int64_t) time (NULL));
}
static void
on_irc_autojoin_timeout (void *user_data)
{
struct server *s = user_data;
// Since we may not have information from RPL_ISUPPORT yet,
// it's our safest bet to send the channels one at a time
struct str_map joins_sent = str_map_make (NULL);
// We don't know the casemapping yet either, however ASCII should do
joins_sent.key_xfrm = tolower_ascii_strxfrm;
// First join autojoin channels in their given order
const char *autojoin = get_config_string (s->config, "autojoin");
if (autojoin)
{
struct strv v = strv_make ();
cstr_split (autojoin, ",", true, &v);
for (size_t i = 0; i < v.len; i++)
{
irc_send (s, "JOIN %s", v.vector[i]);
str_map_set (&joins_sent, v.vector[i], (void *) 1);
}
strv_free (&v);
}
// Then also rejoin any channels from the last disconnect
struct str_map_iter iter = str_map_iter_make (&s->irc_channels);
struct channel *channel;
while ((channel = str_map_iter_next (&iter)))
{
struct str target = str_make ();
str_append (&target, channel->name);
const char *key;
if ((key = str_map_find (&channel->param_modes, "k")))
str_append_printf (&target, " %s", key);
// When a channel is both autojoined and rejoined, both keys are tried
if (!channel->left_manually
&& !str_map_find (&joins_sent, target.str))
irc_send (s, "JOIN %s", target.str);
str_free (&target);
}
str_map_free (&joins_sent);
}
// --- Server I/O --------------------------------------------------------------
static char *
irc_process_hooks (struct server *s, char *input)
{
log_server_debug (s, "#a>> \"#S\"#r", ATTR_JOIN, input);
uint64_t hash = siphash_wrapper (input, strlen (input));
LIST_FOR_EACH (struct hook, iter, s->ctx->irc_hooks)
{
struct irc_hook *hook = (struct irc_hook *) iter;
if (!(input = hook->filter (hook, s, input)))
{
log_server_debug (s, "#a>= #s#r", ATTR_JOIN, "thrown away by hook");
return NULL;
}
// The old input may get freed, so we compare against a hash of it
uint64_t new_hash = siphash_wrapper (input, strlen (input));
if (new_hash != hash)
log_server_debug (s, "#a>= \"#S\"#r", ATTR_JOIN, input);
hash = new_hash;
}
return input;
}
static void irc_process_message
(const struct irc_message *msg, struct server *s);
static void
irc_process_buffer_custom (struct server *s, struct str *buf)
{
const char *start = buf->str, *end = start + buf->len;
for (const char *p = start; p + 1 < end; p++)
{
// Split the input on newlines
if (p[0] != '\r' || p[1] != '\n')
continue;
char *processed = irc_process_hooks (s, xstrndup (start, p - start));
start = p + 2;
if (!processed)
continue;
struct irc_message msg;
irc_parse_message (&msg, processed);
irc_process_message (&msg, s);
irc_free_message (&msg);
free (processed);
}
str_remove_slice (buf, 0, start - buf->str);
}
static enum socket_io_result
irc_try_read (struct server *s)
{
enum socket_io_result result = s->transport->try_read (s);
if (s->read_buffer.len >= (1 << 20))
{
// XXX: this is stupid; if anything, count it in dependence of time;
// we could make transport_tls_try_read() limit the immediate amount
// of data read like socket_io_try_read() does and remove this check
log_server_error (s, s->buffer,
"The IRC server seems to spew out data frantically");
return SOCKET_IO_ERROR;
}
if (s->read_buffer.len)
irc_process_buffer_custom (s, &s->read_buffer);
return result;
}
static enum socket_io_result
irc_try_write (struct server *s)
{
enum socket_io_result result = s->transport->try_write (s);
if (result == SOCKET_IO_OK)
{
// If we're flushing the write buffer and our job is complete, we send
// an EOF to the server, changing the state to IRC_HALF_CLOSED
if (s->state == IRC_CLOSING && !s->write_buffer.len)
irc_real_shutdown (s);
}
return result;
}
static bool
irc_try_read_write (struct server *s)
{
enum socket_io_result read_result;
enum socket_io_result write_result;
if ((read_result = irc_try_read (s)) == SOCKET_IO_ERROR
|| (write_result = irc_try_write (s)) == SOCKET_IO_ERROR)
{
log_server_error (s, s->buffer, "Server connection failed");
return false;
}
// FIXME: this may probably fire multiple times when we're flushing,
// we should probably store a flag next to the state
if (read_result == SOCKET_IO_EOF
|| write_result == SOCKET_IO_EOF)
log_server_error (s, s->buffer, "Server closed the connection");
// If the write needs to read and we receive an EOF, we can't flush
if (write_result == SOCKET_IO_EOF)
return false;
if (read_result == SOCKET_IO_EOF)
{
// Eventually initiate shutdown to flush the write buffer
irc_shutdown (s);
// If there's nothing to write, we can disconnect now
if (s->state == IRC_HALF_CLOSED)
return false;
}
return true;
}
static void
on_irc_ready (const struct pollfd *pfd, struct server *s)
{
if (irc_try_read_write (s))
{
// XXX: shouldn't we rather wait for PONG messages?
irc_reset_connection_timeouts (s);
irc_update_poller (s, pfd);
}
else
// We don't want to keep the socket anymore
irc_disconnect (s);
}
// --- Plain transport ---------------------------------------------------------
static enum socket_io_result
transport_plain_try_read (struct server *s)
{
enum socket_io_result result =
socket_io_try_read (s->socket, &s->read_buffer);
if (result == SOCKET_IO_ERROR)
print_debug ("%s: %s", __func__, strerror (errno));
return result;
}
static enum socket_io_result
transport_plain_try_write (struct server *s)
{
enum socket_io_result result =
socket_io_try_write (s->socket, &s->write_buffer);
if (result == SOCKET_IO_ERROR)
print_debug ("%s: %s", __func__, strerror (errno));
return result;
}
static int
transport_plain_get_poll_events (struct server *s)
{
int events = POLLIN;
if (s->write_buffer.len)
events |= POLLOUT;
return events;
}
static struct transport g_transport_plain =
{
.try_read = transport_plain_try_read,
.try_write = transport_plain_try_write,
.get_poll_events = transport_plain_get_poll_events,
};
// --- TLS transport -----------------------------------------------------------
struct transport_tls_data
{
SSL_CTX *ssl_ctx; ///< SSL context
SSL *ssl; ///< SSL connection
bool ssl_rx_want_tx; ///< SSL_read() wants to write
bool ssl_tx_want_rx; ///< SSL_write() wants to read
};
/// The index in SSL_CTX user data for a reference to the server
static int g_transport_tls_data_index = -1;
static int
transport_tls_verify_callback (int preverify_ok, X509_STORE_CTX *ctx)
{
SSL *ssl = X509_STORE_CTX_get_ex_data
(ctx, SSL_get_ex_data_X509_STORE_CTX_idx ());
struct server *s = SSL_CTX_get_ex_data
(SSL_get_SSL_CTX (ssl), g_transport_tls_data_index);
X509 *cert = X509_STORE_CTX_get_current_cert (ctx);
char *subject = X509_NAME_oneline (X509_get_subject_name (cert), NULL, 0);
char *issuer = X509_NAME_oneline (X509_get_issuer_name (cert), NULL, 0);
log_server_status (s, s->buffer, "Certificate subject: #s", subject);
log_server_status (s, s->buffer, "Certificate issuer: #s", issuer);
if (!preverify_ok)
{
log_server_error (s, s->buffer,
"Certificate verification failed: #s",
X509_verify_cert_error_string (X509_STORE_CTX_get_error (ctx)));
}
free (subject);
free (issuer);
return preverify_ok;
}
static bool
transport_tls_init_ca_set (SSL_CTX *ssl_ctx, const char *file, const char *path,
struct error **e)
{
ERR_clear_error ();
if (file || path)
{
if (SSL_CTX_load_verify_locations (ssl_ctx, file, path))
return true;
return error_set (e, "%s: %s",
"Failed to set locations for the CA certificate bundle",
xerr_describe_error ());
}
if (!SSL_CTX_set_default_verify_paths (ssl_ctx))
return error_set (e, "%s: %s",
"Couldn't load the default CA certificate bundle",
xerr_describe_error ());
return true;
}
static bool
transport_tls_init_ca (struct server *s, SSL_CTX *ssl_ctx, struct error **e)
{
const char *ca_file = get_config_string (s->config, "tls_ca_file");
const char *ca_path = get_config_string (s->config, "tls_ca_path");
char *full_ca_file = ca_file
? resolve_filename (ca_file, resolve_relative_config_filename) : NULL;
char *full_ca_path = ca_path
? resolve_filename (ca_path, resolve_relative_config_filename) : NULL;
bool ok = false;
if (ca_file && !full_ca_file)
error_set (e, "Couldn't find the CA bundle file");
else if (ca_path && !full_ca_path)
error_set (e, "Couldn't find the CA bundle path");
else
ok = transport_tls_init_ca_set (ssl_ctx, full_ca_file, full_ca_path, e);
free (full_ca_file);
free (full_ca_path);
return ok;
}
static bool
transport_tls_init_ctx (struct server *s, SSL_CTX *ssl_ctx, struct error **e)
{
bool verify = get_config_boolean (s->config, "tls_verify");
SSL_CTX_set_verify (ssl_ctx, verify ? SSL_VERIFY_PEER : SSL_VERIFY_NONE,
transport_tls_verify_callback);
if (g_transport_tls_data_index == -1)
g_transport_tls_data_index =
SSL_CTX_get_ex_new_index (0, "server", NULL, NULL, NULL);
SSL_CTX_set_ex_data (ssl_ctx, g_transport_tls_data_index, s);
const char *ciphers = get_config_string (s->config, "tls_ciphers");
if (ciphers && !SSL_CTX_set_cipher_list (ssl_ctx, ciphers))
log_server_error (s, s->buffer,
"Failed to select any cipher from the cipher list");
SSL_CTX_set_mode (ssl_ctx,
SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
// Disable deprecated protocols (see RFC 7568)
SSL_CTX_set_options (ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
// This seems to consume considerable amounts of memory while not giving
// that much in return; in addition to that, I'm not sure about security
// (see RFC 7525, section 3.3)
#ifdef SSL_OP_NO_COMPRESSION
SSL_CTX_set_options (ssl_ctx, SSL_OP_NO_COMPRESSION);
#endif // SSL_OP_NO_COMPRESSION
#ifdef LOMEM
SSL_CTX_set_mode (ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
#endif // LOMEM
struct error *error = NULL;
if (!transport_tls_init_ca (s, ssl_ctx, &error))
{
if (verify)
{
error_propagate (e, error);
return false;
}
// Just inform the user if we're not actually verifying
log_server_error (s, s->buffer, "#s", error->message);
error_free (error);
}
return true;
}
static bool
transport_tls_init_cert (struct server *s, SSL *ssl, struct error **e)
{
const char *tls_cert = get_config_string (s->config, "tls_cert");
if (!tls_cert)
return true;
ERR_clear_error ();
bool result = false;
char *path = resolve_filename (tls_cert, resolve_relative_config_filename);
if (!path)
error_set (e, "%s: %s", "Cannot open file", tls_cert);
// XXX: perhaps we should read the file ourselves for better messages
else if (!SSL_use_certificate_file (ssl, path, SSL_FILETYPE_PEM)
|| !SSL_use_PrivateKey_file (ssl, path, SSL_FILETYPE_PEM))
error_set (e, "%s: %s", "Setting the TLS client certificate failed",
xerr_describe_error ());
else
result = true;
free (path);
return result;
}
static bool
transport_tls_init (struct server *s, const char *hostname, struct error **e)
{
ERR_clear_error ();
struct error *error = NULL;
SSL_CTX *ssl_ctx = SSL_CTX_new (SSLv23_client_method ());
if (!ssl_ctx)
goto error_ssl_1;
if (!transport_tls_init_ctx (s, ssl_ctx, &error))
goto error_ssl_2;
SSL *ssl = SSL_new (ssl_ctx);
if (!ssl)
goto error_ssl_2;
if (!transport_tls_init_cert (s, ssl, &error))
{
// XXX: is this a reason to abort the connection?
log_server_error (s, s->buffer, "#s", error->message);
error_free (error);
error = NULL;
}
SSL_set_connect_state (ssl);
if (!SSL_set_fd (ssl, s->socket))
goto error_ssl_3;
// Enable SNI, FWIW; literal IP addresses aren't allowed
struct in6_addr dummy;
if (!inet_pton (AF_INET, hostname, &dummy)
&& !inet_pton (AF_INET6, hostname, &dummy))
SSL_set_tlsext_host_name (ssl, hostname);
struct transport_tls_data *data = xcalloc (1, sizeof *data);
data->ssl_ctx = ssl_ctx;
data->ssl = ssl;
// Forces a handshake even if neither side wants to transmit data
data->ssl_rx_want_tx = true;
s->transport_data = data;
return true;
error_ssl_3:
SSL_free (ssl);
error_ssl_2:
SSL_CTX_free (ssl_ctx);
error_ssl_1:
if (!error)
error_set (&error, "%s: %s", "Could not initialize TLS",
xerr_describe_error ());
error_propagate (e, error);
return false;
}
static void
transport_tls_cleanup (struct server *s)
{
struct transport_tls_data *data = s->transport_data;
if (data->ssl)
SSL_free (data->ssl);
if (data->ssl_ctx)
SSL_CTX_free (data->ssl_ctx);
free (data);
}
static enum socket_io_result
transport_tls_try_read (struct server *s)
{
struct transport_tls_data *data = s->transport_data;
if (data->ssl_tx_want_rx)
return SOCKET_IO_OK;
struct str *buf = &s->read_buffer;
data->ssl_rx_want_tx = false;
while (true)
{
ERR_clear_error ();
str_reserve (buf, 512);
int n_read = SSL_read (data->ssl, buf->str + buf->len,
buf->alloc - buf->len - 1 /* null byte */);
const char *error_info = NULL;
switch (xssl_get_error (data->ssl, n_read, &error_info))
{
case SSL_ERROR_NONE:
buf->str[buf->len += n_read] = '\0';
continue;
case SSL_ERROR_ZERO_RETURN:
return SOCKET_IO_EOF;
case SSL_ERROR_WANT_READ:
return SOCKET_IO_OK;
case SSL_ERROR_WANT_WRITE:
data->ssl_rx_want_tx = true;
return SOCKET_IO_OK;
case XSSL_ERROR_TRY_AGAIN:
continue;
default:
LOG_FUNC_FAILURE ("SSL_read", error_info);
return SOCKET_IO_ERROR;
}
}
}
static enum socket_io_result
transport_tls_try_write (struct server *s)
{
struct transport_tls_data *data = s->transport_data;
if (data->ssl_rx_want_tx)
return SOCKET_IO_OK;
struct str *buf = &s->write_buffer;
data->ssl_tx_want_rx = false;
while (buf->len)
{
ERR_clear_error ();
int n_written = SSL_write (data->ssl, buf->str, buf->len);
const char *error_info = NULL;
switch (xssl_get_error (data->ssl, n_written, &error_info))
{
case SSL_ERROR_NONE:
str_remove_slice (buf, 0, n_written);
continue;
case SSL_ERROR_ZERO_RETURN:
return SOCKET_IO_EOF;
case SSL_ERROR_WANT_WRITE:
return SOCKET_IO_OK;
case SSL_ERROR_WANT_READ:
data->ssl_tx_want_rx = true;
return SOCKET_IO_OK;
case XSSL_ERROR_TRY_AGAIN:
continue;
default:
LOG_FUNC_FAILURE ("SSL_write", error_info);
return SOCKET_IO_ERROR;
}
}
return SOCKET_IO_OK;
}
static int
transport_tls_get_poll_events (struct server *s)
{
struct transport_tls_data *data = s->transport_data;
int events = POLLIN;
if (s->write_buffer.len || data->ssl_rx_want_tx)
events |= POLLOUT;
// While we're waiting for an opposite event, we ignore the original
if (data->ssl_rx_want_tx) events &= ~POLLIN;
if (data->ssl_tx_want_rx) events &= ~POLLOUT;
return events;
}
static void
transport_tls_in_before_shutdown (struct server *s)
{
struct transport_tls_data *data = s->transport_data;
(void) SSL_shutdown (data->ssl);
}
static struct transport g_transport_tls =
{
.init = transport_tls_init,
.cleanup = transport_tls_cleanup,
.try_read = transport_tls_try_read,
.try_write = transport_tls_try_write,
.get_poll_events = transport_tls_get_poll_events,
.in_before_shutdown = transport_tls_in_before_shutdown,
};
// --- Connection establishment ------------------------------------------------
static bool
irc_autofill_user_info (struct server *s, struct error **e)
{
const char *nicks = get_config_string (s->config, "nicks");
const char *username = get_config_string (s->config, "username");
const char *realname = get_config_string (s->config, "realname");
if (nicks && *nicks && username && *username && realname)
return true;
// Read POSIX user info and fill the configuration if needed
errno = 0;
struct passwd *pwd = getpwuid (geteuid ());
if (!pwd)
{
return error_set (e,
"cannot retrieve user information: %s", strerror (errno));
}
// FIXME: set_config_strings() writes errors on its own
if (!nicks || !*nicks)
set_config_string (s->config, "nicks", pwd->pw_name);
if (!username || !*username)
set_config_string (s->config, "username", pwd->pw_name);
// Not all systems have the GECOS field but the vast majority does
if (!realname)
{
char *gecos = pwd->pw_gecos;
// The first comma, if any, ends the user's real name
char *comma = strchr (gecos, ',');
if (comma)
*comma = '\0';
set_config_string (s->config, "realname", gecos);
}
return true;
}
static char *
irc_fetch_next_nickname (struct server *s)
{
struct strv v = strv_make ();
cstr_split (get_config_string (s->config, "nicks"), ",", true, &v);
char *result = NULL;
if (s->nick_counter >= 0 && (size_t) s->nick_counter < v.len)
result = xstrdup (v.vector[s->nick_counter++]);
if ((size_t) s->nick_counter >= v.len)
// Exhausted all nicknames
s->nick_counter = -1;
strv_free (&v);
return result;
}
static void
irc_register (struct server *s)
{
// Fill in user information automatically if needed
irc_autofill_user_info (s, NULL);
const char *username = get_config_string (s->config, "username");
const char *realname = get_config_string (s->config, "realname");
hard_assert (username && realname);
// Start IRCv3 capability negotiation, with up to 3.2 features;
// at worst the server will ignore this or send a harmless error message
irc_send (s, "CAP LS 302");
const char *password = get_config_string (s->config, "password");
if (password)
irc_send (s, "PASS :%s", password);
s->nick_counter = 0;
char *nickname = irc_fetch_next_nickname (s);
if (nickname)
irc_send (s, "NICK :%s", nickname);
else
log_server_error (s, s->buffer, "No nicks present in configuration");
free (nickname);
// IRC servers may ignore the last argument if it's empty
irc_send (s, "USER %s 8 * :%s", username, *realname ? realname : " ");
}
static void
irc_finish_connection (struct server *s, int socket, const char *hostname)
{
struct app_context *ctx = s->ctx;
// Most of our output comes from the user one full command at a time and we
// use output buffering, so it makes a lot of sense to avoid these delays
int yes = 1;
soft_assert (setsockopt (socket, IPPROTO_TCP, TCP_NODELAY,
&yes, sizeof yes) != -1);
set_blocking (socket, false);
s->socket = socket;
s->transport = get_config_boolean (s->config, "tls")
? &g_transport_tls
: &g_transport_plain;
struct error *e = NULL;
if (s->transport->init && !s->transport->init (s, hostname, &e))
{
log_server_error (s, s->buffer, "Connection failed: #s", e->message);
error_free (e);
xclose (s->socket);
s->socket = -1;
s->transport = NULL;
return;
}
log_server_status (s, s->buffer, "Connection established");
irc_set_state (s, IRC_CONNECTED);
s->socket_event = poller_fd_make (&ctx->poller, s->socket);
s->socket_event.dispatcher = (poller_fd_fn) on_irc_ready;
s->socket_event.user_data = s;
irc_update_poller (s, NULL);
irc_reset_connection_timeouts (s);
irc_register (s);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
irc_on_connector_connecting (void *user_data, const char *address)
{
struct server *s = user_data;
log_server_status (s, s->buffer, "Connecting to #s...", address);
}
static void
irc_on_connector_error (void *user_data, const char *error)
{
struct server *s = user_data;
log_server_error (s, s->buffer, "Connection failed: #s", error);
}
static void
irc_on_connector_failure (void *user_data)
{
struct server *s = user_data;
irc_destroy_connector (s);
irc_queue_reconnect (s);
}
static void
irc_on_connector_connected (void *user_data, int socket, const char *hostname)
{
struct server *s = user_data;
char *hostname_copy = xstrdup (hostname);
irc_destroy_connector (s);
irc_finish_connection (s, socket, hostname_copy);
free (hostname_copy);
}
static void
irc_setup_connector (struct server *s, const struct strv *addresses)
{
struct connector *connector = xmalloc (sizeof *connector);
connector_init (connector, &s->ctx->poller);
s->connector = connector;
connector->user_data = s;
connector->on_connecting = irc_on_connector_connecting;
connector->on_error = irc_on_connector_error;
connector->on_connected = irc_on_connector_connected;
connector->on_failure = irc_on_connector_failure;
for (size_t i = 0; i < addresses->len; i++)
{
const char *port = "6667",
*host = tokenize_host_port (addresses->vector[i], &port);
connector_add_target (connector, host, port);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// TODO: see if we can further merge code for the two connectors, for example
// by making SOCKS 4A and 5 mere plugins for the connector, or by using
// a virtual interface common to them both (seems more likely)
static void
irc_on_socks_connecting (void *user_data,
const char *address, const char *via, const char *version)
{
struct server *s = user_data;
log_server_status (s, s->buffer,
"Connecting to #s via #s (#s)...", address, via, version);
}
static bool
irc_setup_connector_socks (struct server *s, const struct strv *addresses,
struct error **e)
{
const char *socks_host = get_config_string (s->config, "socks_host");
int64_t socks_port_int = get_config_integer (s->config, "socks_port");
if (!socks_host)
return false;
struct socks_connector *connector = xmalloc (sizeof *connector);
socks_connector_init (connector, &s->ctx->poller);
s->socks_conn = connector;
connector->user_data = s;
connector->on_connecting = irc_on_socks_connecting;
connector->on_error = irc_on_connector_error;
connector->on_connected = irc_on_connector_connected;
connector->on_failure = irc_on_connector_failure;
for (size_t i = 0; i < addresses->len; i++)
{
const char *port = "6667",
*host = tokenize_host_port (addresses->vector[i], &port);
if (!socks_connector_add_target (connector, host, port, e))
return false;
}
char *service = xstrdup_printf ("%" PRIi64, socks_port_int);
socks_connector_run (connector, socks_host, service,
get_config_string (s->config, "socks_username"),
get_config_string (s->config, "socks_password"));
free (service);
// The SOCKS connector can have already failed; we mustn't return true then
if (!s->socks_conn)
return error_set (e, "SOCKS connection failed");
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
irc_initiate_connect (struct server *s)
{
hard_assert (s->state == IRC_DISCONNECTED);
const char *addresses = get_config_string (s->config, "addresses");
if (!addresses || !addresses[strspn (addresses, ",")])
{
// No sense in trying to reconnect
log_server_error (s, s->buffer,
"No addresses specified in configuration");
return;
}
struct strv servers = strv_make ();
cstr_split (addresses, ",", true, &servers);
struct error *e = NULL;
if (!irc_setup_connector_socks (s, &servers, &e) && !e)
irc_setup_connector (s, &servers);
strv_free (&servers);
if (e)
{
irc_destroy_connector (s);
log_server_error (s, s->buffer, "#s", e->message);
error_free (e);
irc_queue_reconnect (s);
}
else if (s->state != IRC_CONNECTED)
irc_set_state (s, IRC_CONNECTING);
}
// --- Input prompt ------------------------------------------------------------
static void
make_unseen_prefix (struct app_context *ctx, struct str *active_buffers)
{
size_t buffer_no = 0;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
{
buffer_no++;
if (!(iter->new_messages_count - iter->new_unimportant_count)
|| iter == ctx->current_buffer)
continue;
if (active_buffers->len)
str_append_c (active_buffers, ',');
if (iter->highlighted)
str_append_c (active_buffers, '!');
str_append_printf (active_buffers, "%zu", buffer_no);
}
}
static void
make_chanmode_postfix (struct channel *channel, struct str *modes)
{
if (channel->no_param_modes.len)
str_append (modes, channel->no_param_modes.str);
struct str_map_iter iter = str_map_iter_make (&channel->param_modes);
char *param;
while ((param = str_map_iter_next (&iter)))
str_append_c (modes, iter.link->key[0]);
}
static void
make_server_postfix_registered (struct buffer *buffer, struct str *output)
{
struct server *s = buffer->server;
if (buffer->type == BUFFER_CHANNEL)
{
struct channel_user *channel_user =
irc_channel_get_user (buffer->channel, s->irc_user);
if (channel_user)
irc_get_channel_user_prefix (s, channel_user, output);
}
str_append (output, s->irc_user->nickname);
if (s->irc_user_mode.len)
str_append_printf (output, "(%s)", s->irc_user_mode.str);
}
static void
make_server_postfix (struct buffer *buffer, struct str *output)
{
struct server *s = buffer->server;
str_append_c (output, ' ');
if (!irc_is_connected (s))
str_append (output, "(disconnected)");
else if (s->state != IRC_REGISTERED)
str_append (output, "(unregistered)");
else
make_server_postfix_registered (buffer, output);
}
static void
make_prompt (struct app_context *ctx, struct str *output)
{
LIST_FOR_EACH (struct hook, iter, ctx->prompt_hooks)
{
struct prompt_hook *hook = (struct prompt_hook *) iter;
char *made = hook->make (hook);
if (made)
{
str_append (output, made);
free (made);
return;
}
}
struct buffer *buffer = ctx->current_buffer;
if (!buffer)
return;
str_append_c (output, '[');
struct str active_buffers = str_make ();
make_unseen_prefix (ctx, &active_buffers);
if (active_buffers.len)
str_append_printf (output, "(%s) ", active_buffers.str);
str_free (&active_buffers);
str_append_printf (output, "%d:%s",
buffer_get_index (ctx, buffer), buffer->name);
// We remember old modes, don't show them while we're not on the channel
if (buffer->type == BUFFER_CHANNEL
&& buffer->channel->users_len)
{
struct str modes = str_make ();
make_chanmode_postfix (buffer->channel, &modes);
if (modes.len)
str_append_printf (output, "(+%s)", modes.str);
str_free (&modes);
str_append_printf (output, "{%zu}", buffer->channel->users_len);
}
if (buffer->hide_unimportant)
str_append (output, "<H>");
if (buffer != ctx->global_buffer)
make_server_postfix (buffer, output);
str_append_c (output, ']');
str_append_c (output, ' ');
}
static void
input_maybe_set_prompt (struct input *self, char *new_prompt)
{
// Fix libedit's expectations to see a non-control character following
// the end mark (see prompt.c and literal.c) by cleaning this up
for (char *p = new_prompt; *p; )
if (p[0] == INPUT_END_IGNORE && p[1] == INPUT_START_IGNORE)
memmove (p, p + 2, strlen (p + 2) + 1);
else
p++;
// Redisplay can be an expensive operation
const char *prompt = CALL (self, get_prompt);
if (prompt && !strcmp (new_prompt, prompt))
free (new_prompt);
else
CALL_ (self, set_prompt, new_prompt);
}
static void
on_refresh_prompt (struct app_context *ctx)
{
poller_idle_reset (&ctx->prompt_event);
bool have_attributes = !!get_attribute_printer (stdout);
struct str prompt = str_make ();
make_prompt (ctx, &prompt);
// libedit has a weird bug where it misapplies ignores when they're not
// followed by anything else, so let's try to move a trailing space,
// which will at least fix the default prompt.
const char *attributed_suffix = "";
#ifdef HAVE_EDITLINE
if (have_attributes && prompt.len && prompt.str[prompt.len - 1] == ' ')
{
prompt.str[--prompt.len] = 0;
attributed_suffix = " ";
}
// Also enable a uniform interface for prompt hooks by assuming it uses
// GNU Readline escapes: turn this into libedit's almost-flip-flop
for (size_t i = 0; i < prompt.len; i++)
if (prompt.str[i] == '\x01' || prompt.str[i] == '\x02')
prompt.str[i] = INPUT_START_IGNORE /* == INPUT_END_IGNORE */;
#endif // HAVE_EDITLINE
char *localized = iconv_xstrdup (ctx->term_from_utf8, prompt.str, -1, NULL);
str_free (&prompt);
// XXX: to be completely correct, we should use tputs, but we cannot
if (have_attributes)
{
char buf[16384] = "";
FILE *memfp = fmemopen (buf, sizeof buf - 1, "wb");
struct attr_printer state = { ctx->theme, memfp, false };
fputc (INPUT_START_IGNORE, memfp);
attr_printer_apply_named (&state, ATTR_PROMPT);
fputc (INPUT_END_IGNORE, memfp);
fputs (localized, memfp);
free (localized);
fputc (INPUT_START_IGNORE, memfp);
attr_printer_reset (&state);
fputc (INPUT_END_IGNORE, memfp);
fputs (attributed_suffix, memfp);
fclose (memfp);
input_maybe_set_prompt (ctx->input, xstrdup (buf));
}
else
input_maybe_set_prompt (ctx->input, localized);
}
// --- Helpers -----------------------------------------------------------------
static struct buffer *
irc_get_buffer_for_message (struct server *s,
const struct irc_message *msg, const char *target)
{
// TODO: display such messages differently
target = irc_skip_statusmsg (s, target);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, target);
if (irc_is_channel (s, target))
{
struct channel *channel = str_map_find (&s->irc_channels, target);
hard_assert (channel || !buffer);
// This is weird
if (!channel)
return NULL;
}
else if (!buffer)
{
// Outgoing messages needn't have a prefix, no buffer associated
if (!msg->prefix)
return NULL;
// Don't make user buffers for servers (they can send NOTICEs)
if (!irc_find_userhost (msg->prefix))
return s->buffer;
char *nickname = irc_cut_nickname (msg->prefix);
if (irc_is_this_us (s, target))
buffer = irc_get_or_make_user_buffer (s, nickname);
free (nickname);
// With the IRCv3.2 echo-message capability, we can receive messages
// as they are delivered to the target; in that case we return NULL
// and the caller should check the origin
}
return buffer;
}
static bool
irc_is_highlight (struct server *s, const char *message)
{
// This may be called by notices before even successfully registering
if (!s->irc_user)
return false;
// Strip formatting from the message so that it doesn't interfere
// with nickname detection (colour sequences in particular)
struct formatter f = formatter_make (s->ctx, NULL);
formatter_parse_message (&f, message);
struct str stripped = str_make ();
for (size_t i = 0; i < f.items_len; i++)
{
if (f.items[i].type == FORMATTER_ITEM_TEXT)
str_append (&stripped, f.items[i].text);
}
formatter_free (&f);
// Well, this is rather crude but it should make most users happy.
// We could do this in proper Unicode but that's two more conversions per
// message when both the nickname and the message are likely valid UTF-8.
char *copy = str_steal (&stripped);
cstr_transform (copy, s->irc_tolower);
char *nick = xstrdup (s->irc_user->nickname);
cstr_transform (nick, s->irc_tolower);
// Special characters allowed in nicknames by RFC 2812: []\`_^{|} and -
// Also excluded from the ASCII: common user channel prefixes: +%@&~
// XXX: why did I exclude those? It won't match when IRC newbies use them.
const char *delimiters = ",.;:!?()<>/=#$* \t\r\n\v\f\"'";
bool result = false;
char *save = NULL;
for (char *token = strtok_r (copy, delimiters, &save);
token; token = strtok_r (NULL, delimiters, &save))
if (!strcmp (token, nick))
{
result = true;
break;
}
free (copy);
free (nick);
return result;
}
static char *
irc_get_privmsg_prefix (struct server *s, struct user *user, const char *target)
{
struct str prefix = str_make ();
if (user && irc_is_channel (s, (target = irc_skip_statusmsg (s, target))))
{
struct channel *channel;
struct channel_user *channel_user;
if ((channel = str_map_find (&s->irc_channels, target))
&& (channel_user = irc_channel_get_user (channel, user)))
irc_get_channel_user_prefix (s, channel_user, &prefix);
}
return str_steal (&prefix);
}
// --- Mode processor ----------------------------------------------------------
struct mode_processor
{
char **params; ///< Mode string parameters
bool adding; ///< Currently adding modes
char mode_char; ///< Currently processed mode char
// User data:
struct server *s; ///< Server
struct channel *channel; ///< The channel being modified
unsigned changes; ///< Count of all changes
unsigned usermode_changes; ///< Count of all usermode changes
};
/// Process a single mode character
typedef bool (*mode_processor_apply_fn) (struct mode_processor *);
static const char *
mode_processor_next_param (struct mode_processor *self)
{
if (!*self->params)
return NULL;
return *self->params++;
}
static void
mode_processor_run (struct mode_processor *self,
char **params, mode_processor_apply_fn apply_cb)
{
self->params = params;
const char *mode_string;
while ((mode_string = mode_processor_next_param (self)))
{
self->adding = true;
while ((self->mode_char = *mode_string++))
{
if (self->mode_char == '+') self->adding = true;
else if (self->mode_char == '-') self->adding = false;
else if (!apply_cb (self))
break;
}
}
}
static int
mode_char_cmp (const void *a, const void *b)
{
return *(const char *) a - *(const char *) b;
}
/// Add/remove the current mode character to/from the given ordered list
static void
mode_processor_toggle (struct mode_processor *self, struct str *modes)
{
const char *pos = strchr (modes->str, self->mode_char);
if (self->adding == !!pos)
return;
if (self->adding)
{
str_append_c (modes, self->mode_char);
qsort (modes->str, modes->len, 1, mode_char_cmp);
}
else
str_remove_slice (modes, pos - modes->str, 1);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
mode_processor_do_user (struct mode_processor *self)
{
const char *nickname;
struct user *user;
struct channel_user *channel_user;
if (!(nickname = mode_processor_next_param (self))
|| !(user = str_map_find (&self->s->irc_users, nickname))
|| !(channel_user = irc_channel_get_user (self->channel, user)))
return;
// Translate mode character to user prefix character
const char *all_prefixes = self->s->irc_chanuser_prefixes;
const char *all_modes = self->s->irc_chanuser_modes;
const char *mode = strchr (all_modes, self->mode_char);
hard_assert (mode && (size_t) (mode - all_modes) < strlen (all_prefixes));
char prefix = all_prefixes[mode - all_modes];
char **prefixes = &channel_user->prefixes;
char *pos = strchr (*prefixes, prefix);
if (self->adding == !!pos)
return;
if (self->adding)
{
// Add the new mode prefix while retaining the right order
struct str buf = str_make ();
for (const char *p = all_prefixes; *p; p++)
if (*p == prefix || strchr (*prefixes, *p))
str_append_c (&buf, *p);
cstr_set (prefixes, str_steal (&buf));
}
else
memmove (pos, pos + 1, strlen (pos));
}
static void
mode_processor_do_param_always (struct mode_processor *self)
{
const char *param = NULL;
if (!(param = mode_processor_next_param (self)))
return;
char key[2] = { self->mode_char, 0 };
str_map_set (&self->channel->param_modes, key,
self->adding ? xstrdup (param) : NULL);
}
static void
mode_processor_do_param_when_set (struct mode_processor *self)
{
const char *param = NULL;
if (self->adding && !(param = mode_processor_next_param (self)))
return;
char key[2] = { self->mode_char, 0 };
str_map_set (&self->channel->param_modes, key,
self->adding ? xstrdup (param) : NULL);
}
static bool
mode_processor_apply_channel (struct mode_processor *self)
{
self->changes++;
if (strchr (self->s->irc_chanuser_modes, self->mode_char))
{
self->usermode_changes++;
mode_processor_do_user (self);
}
else if (strchr (self->s->irc_chanmodes_list, self->mode_char))
// Nothing to do here, just skip the next argument if there's any
(void) mode_processor_next_param (self);
else if (strchr (self->s->irc_chanmodes_param_always, self->mode_char))
mode_processor_do_param_always (self);
else if (strchr (self->s->irc_chanmodes_param_when_set, self->mode_char))
mode_processor_do_param_when_set (self);
else if (strchr (self->s->irc_chanmodes_param_never, self->mode_char))
mode_processor_toggle (self, &self->channel->no_param_modes);
else
// It's not safe to continue, results could be undesired
return false;
return true;
}
/// Returns whether the change has only affected channel user modes
static bool
irc_handle_mode_channel (struct channel *channel, char **params)
{
struct mode_processor p = { .s = channel->s, .channel = channel };
mode_processor_run (&p, params, mode_processor_apply_channel);
return p.changes == p.usermode_changes;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
mode_processor_apply_user (struct mode_processor *self)
{
mode_processor_toggle (self, &self->s->irc_user_mode);
return true;
}
static void
irc_handle_mode_user (struct server *s, char **params)
{
struct mode_processor p = { .s = s };
mode_processor_run (&p, params, mode_processor_apply_user);
}
// --- Output processing -------------------------------------------------------
// Both user and plugins can send whatever the heck they want to,
// we need to parse it back so that it's evident what's happening
static void
irc_handle_sent_cap (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 1)
return;
const char *subcommand = msg->params.vector[0];
const char *args = (msg->params.len > 1) ? msg->params.vector[1] : "";
if (!strcasecmp_ascii (subcommand, "REQ"))
log_server_status (s, s->buffer,
"#s: #S", "Capabilities requested", args);
}
static void
irc_handle_sent_join (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 1)
return;
if (strcmp (msg->params.vector[0], "0"))
cstr_split (msg->params.vector[0], ",", true, &s->outstanding_joins);
}
static void
irc_handle_sent_notice_text (struct server *s,
const struct irc_message *msg, struct str *text)
{
const char *target = msg->params.vector[0];
struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
if (buffer && soft_assert (s->irc_user))
log_outcoming_notice (s, buffer, s->irc_user->nickname, text->str);
else
log_outcoming_orphan_notice (s, target, text->str);
}
static void
irc_handle_sent_notice (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2 || s->cap_echo_message)
return;
// This ignores empty messages which we should not normally send
struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
{
if (iter->is_extended)
log_ctcp_reply (s, msg->params.vector[0],
xstrdup_printf ("%s %s", iter->tag.str, iter->text.str));
else
irc_handle_sent_notice_text (s, msg, &iter->text);
}
ctcp_destroy (chunks);
}
static void
irc_handle_sent_privmsg_text (struct server *s,
const struct irc_message *msg, struct str *text, bool is_action)
{
const char *target = msg->params.vector[0];
struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
if (buffer && soft_assert (s->irc_user))
{
char *prefixes = irc_get_privmsg_prefix (s, s->irc_user, target);
if (is_action)
log_outcoming_action (s, buffer, s->irc_user->nickname, text->str);
else
log_outcoming_privmsg (s, buffer,
prefixes, s->irc_user->nickname, text->str);
free (prefixes);
}
else if (is_action)
log_outcoming_orphan_action (s, target, text->str);
else
log_outcoming_orphan_privmsg (s, target, text->str);
}
static void
irc_handle_sent_privmsg (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2 || s->cap_echo_message)
return;
// This ignores empty messages which we should not normally send
// and the server is likely going to reject with an error reply anyway
struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
{
if (!iter->is_extended)
irc_handle_sent_privmsg_text (s, msg, &iter->text, false);
else if (!strcmp (iter->tag.str, "ACTION"))
irc_handle_sent_privmsg_text (s, msg, &iter->text, true);
else
log_ctcp_query (s, msg->params.vector[0], iter->tag.str);
}
ctcp_destroy (chunks);
}
static struct irc_handler
{
const char *name;
void (*handler) (struct server *s, const struct irc_message *msg);
}
g_irc_sent_handlers[] =
{
// This list needs to stay sorted
{ "CAP", irc_handle_sent_cap },
{ "JOIN", irc_handle_sent_join },
{ "NOTICE", irc_handle_sent_notice },
{ "PRIVMSG", irc_handle_sent_privmsg },
};
static int
irc_handler_cmp_by_name (const void *a, const void *b)
{
const struct irc_handler *first = a;
const struct irc_handler *second = b;
return strcasecmp_ascii (first->name, second->name);
}
static void
irc_process_sent_message (const struct irc_message *msg, struct server *s)
{
// The server is free to reject even a matching prefix
// XXX: even though no prefix should normally be present, this is racy
if (msg->prefix && !irc_is_this_us (s, msg->prefix))
return;
struct irc_handler key = { .name = msg->command };
struct irc_handler *handler = bsearch (&key, g_irc_sent_handlers,
N_ELEMENTS (g_irc_sent_handlers), sizeof key, irc_handler_cmp_by_name);
if (handler)
handler->handler (s, msg);
}
// --- Input handling ----------------------------------------------------------
static void
irc_handle_authenticate (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 1)
return;
// Empty challenge -> empty response for e.g. SASL EXTERNAL,
// abort anything else as it doesn't make much sense to let the user do it
if (!strcmp (msg->params.vector[0], "+"))
irc_send (s, "AUTHENTICATE +");
else
irc_send (s, "AUTHENTICATE *");
}
static void
irc_handle_away (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix)
return;
char *nickname = irc_cut_nickname (msg->prefix);
struct user *user = str_map_find (&s->irc_users, nickname);
free (nickname);
// Let's allow the server to make us away
if (user)
user->away = !!msg->params.len;
}
static void
irc_process_cap_ls (struct server *s)
{
log_server_status (s, s->buffer,
"#s: #&S", "Capabilities supported", strv_join (&s->cap_ls_buf, " "));
struct strv chosen = strv_make ();
struct strv use = strv_make ();
cstr_split (get_config_string (s->config, "capabilities"), ",", true, &use);
// Filter server capabilities for ones we can make use of
for (size_t i = 0; i < s->cap_ls_buf.len; i++)
{
const char *cap = s->cap_ls_buf.vector[i];
size_t cap_name_len = strcspn (cap, "=");
for (size_t k = 0; k < use.len; k++)
if (!strncasecmp_ascii (use.vector[k], cap, cap_name_len))
strv_append_owned (&chosen, xstrndup (cap, cap_name_len));
}
strv_reset (&s->cap_ls_buf);
char *chosen_str = strv_join (&chosen, " ");
strv_free (&chosen);
strv_free (&use);
// XXX: with IRCv3.2, this may end up being too long for one message,
// and we need to be careful with CAP END. One probably has to count
// the number of sent CAP REQ vs the number of received CAP ACK/NAK.
if (s->state == IRC_CONNECTED)
irc_send (s, "CAP REQ :%s", chosen_str);
free (chosen_str);
}
static void
irc_toggle_cap (struct server *s, const char *cap, bool active)
{
if (!strcasecmp_ascii (cap, "echo-message")) s->cap_echo_message = active;
if (!strcasecmp_ascii (cap, "away-notify")) s->cap_away_notify = active;
if (!strcasecmp_ascii (cap, "sasl")) s->cap_sasl = active;
}
static void
irc_try_finish_cap_negotiation (struct server *s)
{
// It does not make sense to do this post-registration, although it would
// not hurt either, as the server must ignore it in that case
if (s->state == IRC_CONNECTED)
irc_send (s, "CAP END");
}
static void
irc_handle_cap (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return;
struct strv v = strv_make ();
const char *args = "";
if (msg->params.len > 2)
cstr_split ((args = msg->params.vector[2]), " ", true, &v);
const char *subcommand = msg->params.vector[1];
if (!strcasecmp_ascii (subcommand, "ACK"))
{
log_server_status (s, s->buffer,
"#s: #S", "Capabilities acknowledged", args);
for (size_t i = 0; i < v.len; i++)
{
const char *cap = v.vector[i];
bool active = true;
if (*cap == '-')
{
active = false;
cap++;
}
irc_toggle_cap (s, cap, active);
}
if (s->cap_sasl && s->transport == &g_transport_tls)
irc_send (s, "AUTHENTICATE EXTERNAL");
else
irc_try_finish_cap_negotiation (s);
}
else if (!strcasecmp_ascii (subcommand, "NAK"))
{
log_server_error (s, s->buffer,
"#s: #S", "Capabilities not acknowledged", args);
irc_try_finish_cap_negotiation (s);
}
else if (!strcasecmp_ascii (subcommand, "DEL"))
{
log_server_error (s, s->buffer,
"#s: #S", "Capabilities deleted", args);
for (size_t i = 0; i < v.len; i++)
irc_toggle_cap (s, v.vector[i], false);
}
else if (!strcasecmp_ascii (subcommand, "LS"))
{
if (msg->params.len > 3 && !strcmp (args, "*"))
cstr_split (msg->params.vector[3], " ", true, &s->cap_ls_buf);
else
{
strv_append_vector (&s->cap_ls_buf, v.vector);
irc_process_cap_ls (s);
}
}
strv_free (&v);
}
static void
irc_handle_chghost (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 2)
return;
char *nickname = irc_cut_nickname (msg->prefix);
struct user *user = str_map_find (&s->irc_users, nickname);
free (nickname);
if (!user)
return;
char *new_prefix = xstrdup_printf ("%s!%s@%s", user->nickname,
msg->params.vector[0], msg->params.vector[1]);
if (irc_is_this_us (s, msg->prefix))
{
cstr_set (&s->irc_user_host, xstrdup_printf ("%s@%s",
msg->params.vector[0], msg->params.vector[1]));
log_chghost_self (s, s->buffer, new_prefix);
// Log a message in all open buffers on this server
struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
struct buffer *buffer;
while ((buffer = str_map_iter_next (&iter)))
log_chghost_self (s, buffer, new_prefix);
}
else
{
// Log a message in any PM buffer
struct buffer *buffer =
str_map_find (&s->irc_buffer_map, user->nickname);
if (buffer)
log_chghost (s, buffer, msg->prefix, new_prefix);
// Log a message in all channels the user is in
LIST_FOR_EACH (struct user_channel, iter, user->channels)
{
buffer = str_map_find (&s->irc_buffer_map, iter->channel->name);
hard_assert (buffer != NULL);
log_chghost (s, buffer, msg->prefix, new_prefix);
}
}
free (new_prefix);
}
static void
irc_handle_error (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 1)
return;
log_server_error (s, s->buffer, "#m", msg->params.vector[0]);
}
static void
irc_handle_invite (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 2)
return;
const char *target = msg->params.vector[0];
const char *channel_name = msg->params.vector[1];
struct buffer *buffer;
if (!(buffer = str_map_find (&s->irc_buffer_map, channel_name)))
buffer = s->buffer;
// IRCv3.2 invite-notify extension allows the target to be someone else
if (irc_is_this_us (s, target))
log_server_status (s, buffer,
"#n has invited you to #S", msg->prefix, channel_name);
else
log_server_status (s, buffer,
"#n has invited #n to #S", msg->prefix, target, channel_name);
}
static bool
irc_satisfy_join (struct server *s, const char *target)
{
// This queue could use some garbage collection,
// but it's unlikely to pose problems.
for (size_t i = 0; i < s->outstanding_joins.len; i++)
if (!irc_server_strcmp (s, target, s->outstanding_joins.vector[i]))
{
strv_remove (&s->outstanding_joins, i);
return true;
}
return false;
}
static void
irc_handle_join (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 1)
return;
// TODO: RFC 2812 doesn't guarantee that the argument isn't a target list.
const char *channel_name = msg->params.vector[0];
if (!irc_is_channel (s, channel_name))
return;
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
// We've joined a new channel
if (!channel)
{
// This is weird, ignoring
if (!irc_is_this_us (s, msg->prefix))
return;
buffer = buffer_new (s->ctx->input,
BUFFER_CHANNEL, irc_make_buffer_name (s, channel_name));
buffer->server = s;
buffer->channel = channel =
irc_make_channel (s, xstrdup (channel_name));
str_map_set (&s->irc_buffer_map, channel->name, buffer);
buffer_add (s->ctx, buffer);
char *input = CALL_ (s->ctx->input, get_line, NULL);
if (irc_satisfy_join (s, channel_name) && !*input)
buffer_activate (s->ctx, buffer);
else
buffer->highlighted = true;
free (input);
}
if (irc_is_this_us (s, msg->prefix))
{
// Reset the field so that we rejoin the channel after reconnecting
channel->left_manually = false;
// Request the channel mode as we don't get it automatically
str_reset (&channel->no_param_modes);
str_map_clear (&channel->param_modes);
irc_send (s, "MODE %s", channel_name);
if ((channel->show_names_after_who = s->cap_away_notify))
irc_send (s, "WHO %s", channel_name);
}
// Add the user to the channel
char *nickname = irc_cut_nickname (msg->prefix);
irc_channel_link_user (channel, irc_get_or_make_user (s, nickname), "");
free (nickname);
// Finally log the message
if (buffer)
{
log_server (s, buffer, BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_JOIN,
"#N #a#s#r #S", msg->prefix, ATTR_JOIN, "has joined", channel_name);
}
}
static void
irc_handle_kick (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 2)
return;
const char *channel_name = msg->params.vector[0];
const char *target = msg->params.vector[1];
if (!irc_is_channel (s, channel_name)
|| irc_is_channel (s, target))
return;
const char *message = NULL;
if (msg->params.len > 2)
message = msg->params.vector[2];
struct user *user = str_map_find (&s->irc_users, target);
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
// It would be weird for this to be false
if (user && channel)
{
if (irc_is_this_us (s, target))
irc_left_channel (channel);
else
irc_remove_user_from_channel (user, channel);
}
if (buffer)
{
struct formatter f = formatter_make (s->ctx, s);
formatter_add (&f, "#N #a#s#r #n",
msg->prefix, ATTR_PART, "has kicked", target);
if (message)
formatter_add (&f, " (#m)", message);
log_formatter (s->ctx, buffer, 0, BUFFER_LINE_PART, &f);
}
}
static void
irc_handle_kill (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 2)
return;
const char *target = msg->params.vector[0];
const char *comment = msg->params.vector[1];
if (irc_is_this_us (s, target))
log_server_status (s, s->buffer,
"You've been killed by #n (#m)", msg->prefix, comment);
}
static void
irc_handle_mode (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 1)
return;
const char *context = msg->params.vector[0];
// Join the modes back to a single string
struct strv copy = strv_make ();
strv_append_vector (&copy, msg->params.vector + 1);
char *modes = strv_join (&copy, " ");
strv_free (&copy);
if (irc_is_channel (s, context))
{
struct channel *channel = str_map_find (&s->irc_channels, context);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, context);
hard_assert (channel || !buffer);
int flags = 0;
if (channel
&& irc_handle_mode_channel (channel, msg->params.vector + 1))
// This is 90% automode spam, let's not let it steal attention,
// maybe this behaviour should be configurable though
flags = BUFFER_LINE_UNIMPORTANT;
if (buffer)
{
log_server (s, buffer, flags, BUFFER_LINE_STATUS,
"Mode #S [#S] by #n", context, modes, msg->prefix);
}
}
else if (irc_is_this_us (s, context))
{
irc_handle_mode_user (s, msg->params.vector + 1);
log_server_status (s, s->buffer,
"User mode [#S] by #n", modes, msg->prefix);
}
free (modes);
}
static void
irc_handle_nick (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 1)
return;
const char *new_nickname = msg->params.vector[0];
char *nickname = irc_cut_nickname (msg->prefix);
struct user *user = str_map_find (&s->irc_users, nickname);
free (nickname);
if (!user)
return;
bool lexicographically_different =
!!irc_server_strcmp (s, user->nickname, new_nickname);
// What the fuck, someone renamed themselves to ourselves
// TODO: probably log a message and force a reconnect
if (lexicographically_different
&& !irc_server_strcmp (s, new_nickname, s->irc_user->nickname))
return;
// Log a message in any PM buffer (we may even have one for ourselves)
struct buffer *pm_buffer =
str_map_find (&s->irc_buffer_map, user->nickname);
if (pm_buffer)
{
if (irc_is_this_us (s, msg->prefix))
log_nick_self (s, pm_buffer, new_nickname);
else
log_nick (s, pm_buffer, msg->prefix, new_nickname);
}
// The new nickname may collide with a user referenced by a PM buffer,
// or in case of data inconsistency with the server, channels.
// In the latter case we need the colliding user to leave all of them.
struct user *user_collision = NULL;
if (lexicographically_different
&& (user_collision = str_map_find (&s->irc_users, new_nickname)))
LIST_FOR_EACH (struct user_channel, iter, user_collision->channels)
irc_remove_user_from_channel (user_collision, iter->channel);
struct buffer *buffer_collision = NULL;
if (lexicographically_different
&& (buffer_collision = str_map_find (&s->irc_buffer_map, new_nickname)))
{
hard_assert (buffer_collision->type == BUFFER_PM);
hard_assert (buffer_collision->user == user_collision);
user_unref (buffer_collision->user);
buffer_collision->user = user_ref (user);
}
if (pm_buffer && buffer_collision)
{
// There's not much else we can do other than somehow try to merge
// one buffer into the other. In our case, the original buffer wins.
buffer_merge (s->ctx, buffer_collision, pm_buffer);
if (s->ctx->current_buffer == pm_buffer)
buffer_activate (s->ctx, buffer_collision);
buffer_remove (s->ctx, pm_buffer);
pm_buffer = buffer_collision;
}
// The colliding user should be completely gone by now
if (lexicographically_different)
hard_assert (!str_map_find (&s->irc_users, new_nickname));
// Now we can rename the PM buffer to reflect the new nickname
if (pm_buffer)
{
str_map_set (&s->irc_buffer_map, user->nickname, NULL);
str_map_set (&s->irc_buffer_map, new_nickname, pm_buffer);
char *x = irc_make_buffer_name (s, new_nickname);
buffer_rename (s->ctx, pm_buffer, x);
free (x);
}
if (irc_is_this_us (s, msg->prefix))
{
log_nick_self (s, s->buffer, new_nickname);
// Log a message in all open buffers on this server
struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
struct buffer *buffer;
while ((buffer = str_map_iter_next (&iter)))
{
// We've already done that
if (buffer != pm_buffer)
log_nick_self (s, buffer, new_nickname);
}
}
else
{
// Log a message in all channels the user is in
LIST_FOR_EACH (struct user_channel, iter, user->channels)
{
struct buffer *buffer =
str_map_find (&s->irc_buffer_map, iter->channel->name);
hard_assert (buffer != NULL);
log_nick (s, buffer, msg->prefix, new_nickname);
}
}
// Finally rename the user as it should be safe now
str_map_set (&s->irc_users, user->nickname, NULL);
str_map_set (&s->irc_users, new_nickname, user);
cstr_set (&user->nickname, xstrdup (new_nickname));
}
static void
irc_handle_ctcp_reply (struct server *s,
const struct irc_message *msg, struct ctcp_chunk *chunk)
{
const char *target = msg->params.vector[0];
if (irc_is_this_us (s, msg->prefix))
log_ctcp_reply (s, target,
xstrdup_printf ("%s %s", chunk->tag.str, chunk->text.str));
else
log_server_status (s, s->buffer, "CTCP reply from #n: #S #S",
msg->prefix, chunk->tag.str, chunk->text.str);
}
static void
irc_handle_notice_text (struct server *s,
const struct irc_message *msg, struct str *text)
{
const char *target = msg->params.vector[0];
struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
if (!buffer)
{
if (irc_is_this_us (s, msg->prefix))
log_outcoming_orphan_notice (s, target, text->str);
return;
}
char *nick = irc_cut_nickname (msg->prefix);
// IRCv3.2 echo-message could otherwise cause us to highlight ourselves
if (!irc_is_this_us (s, msg->prefix) && irc_is_highlight (s, text->str))
log_server (s, buffer, BUFFER_LINE_HIGHLIGHT, BUFFER_LINE_STATUS,
"#a#s(#S)#r: #m", ATTR_HIGHLIGHT, "Notice", nick, text->str);
else
log_outcoming_notice (s, buffer, msg->prefix, text->str);
free (nick);
}
static void
irc_handle_notice (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 2)
return;
// This ignores empty messages which we should never receive anyway
struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
if (!iter->is_extended)
irc_handle_notice_text (s, msg, &iter->text);
else
irc_handle_ctcp_reply (s, msg, iter);
ctcp_destroy (chunks);
}
static void
irc_handle_part (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 1)
return;
const char *channel_name = msg->params.vector[0];
if (!irc_is_channel (s, channel_name))
return;
const char *message = NULL;
if (msg->params.len > 1)
message = msg->params.vector[1];
char *nickname = irc_cut_nickname (msg->prefix);
struct user *user = str_map_find (&s->irc_users, nickname);
free (nickname);
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
// It would be weird for this to be false
if (user && channel)
{
if (irc_is_this_us (s, msg->prefix))
irc_left_channel (channel);
else
irc_remove_user_from_channel (user, channel);
}
if (buffer)
{
struct formatter f = formatter_make (s->ctx, s);
formatter_add (&f, "#N #a#s#r #S",
msg->prefix, ATTR_PART, "has left", channel_name);
if (message)
formatter_add (&f, " (#m)", message);
log_formatter (s->ctx, buffer,
BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_PART, &f);
}
}
static void
irc_handle_ping (struct server *s, const struct irc_message *msg)
{
if (msg->params.len)
irc_send (s, "PONG :%s", msg->params.vector[0]);
else
irc_send (s, "PONG");
}
static char *
ctime_now (char buf[26])
{
struct tm tm_;
time_t now = time (NULL);
if (!asctime_r (localtime_r (&now, &tm_), buf))
return NULL;
// Annoying thing
*strchr (buf, '\n') = '\0';
return buf;
}
static void irc_send_ctcp_reply (struct server *s, const char *recipient,
const char *format, ...) ATTRIBUTE_PRINTF (3, 4);
static void
irc_send_ctcp_reply (struct server *s,
const char *recipient, const char *format, ...)
{
struct str m = str_make ();
va_list ap;
va_start (ap, format);
str_append_vprintf (&m, format, ap);
va_end (ap);
irc_send (s, "NOTICE %s :\x01%s\x01", recipient, m.str);
str_free (&m);
}
static void
irc_handle_ctcp_request (struct server *s,
const struct irc_message *msg, struct ctcp_chunk *chunk)
{
const char *target = msg->params.vector[0];
if (irc_is_this_us (s, msg->prefix))
{
if (s->cap_echo_message)
log_ctcp_query (s, target, chunk->tag.str);
if (!irc_is_this_us (s, target))
return;
}
struct formatter f = formatter_make (s->ctx, s);
formatter_add (&f, "CTCP requested by #n", msg->prefix);
if (irc_is_channel (s, irc_skip_statusmsg (s, target)))
formatter_add (&f, " (to #S)", target);
formatter_add (&f, ": #S", chunk->tag.str);
log_formatter (s->ctx, s->buffer, 0, BUFFER_LINE_STATUS, &f);
char *nickname = irc_cut_nickname (msg->prefix);
if (!strcmp (chunk->tag.str, "CLIENTINFO"))
irc_send_ctcp_reply (s, nickname, "CLIENTINFO %s %s %s %s",
"PING", "VERSION", "TIME", "CLIENTINFO");
else if (!strcmp (chunk->tag.str, "PING"))
irc_send_ctcp_reply (s, nickname, "PING %s", chunk->text.str);
else if (!strcmp (chunk->tag.str, "VERSION"))
{
struct utsname info;
if (uname (&info))
LOG_LIBC_FAILURE ("uname");
else
irc_send_ctcp_reply (s, nickname, "VERSION %s %s on %s %s",
PROGRAM_NAME, PROGRAM_VERSION, info.sysname, info.machine);
}
else if (!strcmp (chunk->tag.str, "TIME"))
{
char buf[26];
if (!ctime_now (buf))
LOG_LIBC_FAILURE ("asctime_r");
else
irc_send_ctcp_reply (s, nickname, "TIME %s", buf);
}
free (nickname);
}
static void
irc_handle_privmsg_text (struct server *s,
const struct irc_message *msg, struct str *text, bool is_action)
{
const char *target = msg->params.vector[0];
struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
if (!buffer)
{
if (irc_is_this_us (s, msg->prefix))
log_outcoming_orphan_privmsg (s, target, text->str);
return;
}
char *nickname = irc_cut_nickname (msg->prefix);
char *prefixes = irc_get_privmsg_prefix
(s, str_map_find (&s->irc_users, nickname), target);
// Make autocomplete offer recent speakers first on partial matches
// (note that freshly joined users also move to the front)
struct user *user;
struct channel_user *channel_user;
if (!irc_is_this_us (s, msg->prefix) && buffer->channel
&& (user = str_map_find (&s->irc_users, nickname))
&& (channel_user = irc_channel_get_user (buffer->channel, user)))
{
LIST_UNLINK (buffer->channel->users, channel_user);
LIST_PREPEND (buffer->channel->users, channel_user);
}
// IRCv3.2 echo-message could otherwise cause us to highlight ourselves
if (irc_is_this_us (s, msg->prefix) || !irc_is_highlight (s, text->str))
{
if (is_action)
log_outcoming_action (s, buffer, nickname, text->str);
else
log_outcoming_privmsg (s, buffer, prefixes, nickname, text->str);
}
else if (is_action)
log_server (s, buffer, BUFFER_LINE_HIGHLIGHT, 0,
" #a*#r #n #m", ATTR_HIGHLIGHT, msg->prefix, text->str);
else
log_server (s, buffer, BUFFER_LINE_HIGHLIGHT, 0,
"#a<#S#S>#r #m", ATTR_HIGHLIGHT, prefixes, nickname, text->str);
free (nickname);
free (prefixes);
}
static void
irc_handle_privmsg (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 2)
return;
// This ignores empty messages which we should never receive anyway
struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
if (!iter->is_extended)
irc_handle_privmsg_text (s, msg, &iter->text, false);
else if (!strcmp (iter->tag.str, "ACTION"))
irc_handle_privmsg_text (s, msg, &iter->text, true);
else
irc_handle_ctcp_request (s, msg, iter);
ctcp_destroy (chunks);
}
static void
log_quit (struct server *s,
struct buffer *buffer, const char *prefix, const char *reason)
{
struct formatter f = formatter_make (s->ctx, s);
formatter_add (&f, "#N #a#s#r", prefix, ATTR_PART, "has quit");
if (reason)
formatter_add (&f, " (#m)", reason);
log_formatter (s->ctx, buffer,
BUFFER_LINE_UNIMPORTANT, BUFFER_LINE_PART, &f);
}
static void
irc_handle_quit (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix)
return;
// What the fuck, the server never sends this back
if (irc_is_this_us (s, msg->prefix))
return;
char *nickname = irc_cut_nickname (msg->prefix);
struct user *user = str_map_find (&s->irc_users, nickname);
free (nickname);
if (!user)
return;
const char *message = NULL;
if (msg->params.len > 0)
message = msg->params.vector[0];
// Log a message in any PM buffer
struct buffer *buffer =
str_map_find (&s->irc_buffer_map, user->nickname);
if (buffer)
{
log_quit (s, buffer, msg->prefix, message);
// TODO: set some kind of a flag in the buffer and when the user
// reappears on a channel (JOIN), log a "is back online" message.
// Also set this flag when we receive a "no such nick" numeric
// and reset it when we send something to the buffer.
}
// Log a message in all channels the user is in
LIST_FOR_EACH (struct user_channel, iter, user->channels)
{
if ((buffer = str_map_find (&s->irc_buffer_map, iter->channel->name)))
log_quit (s, buffer, msg->prefix, message);
// This destroys "iter" which doesn't matter to us
irc_remove_user_from_channel (user, iter->channel);
}
}
static void
irc_handle_tagmsg (struct server *s, const struct irc_message *msg)
{
// TODO: here we can process "typing" tags, once we find this useful
(void) s;
(void) msg;
}
static void
irc_handle_topic (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 2)
return;
const char *channel_name = msg->params.vector[0];
const char *topic = msg->params.vector[1];
if (!irc_is_channel (s, channel_name))
return;
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
// It would be weird for this to be false
if (channel)
cstr_set (&channel->topic, xstrdup (topic));
if (buffer)
{
log_server (s, buffer, 0, BUFFER_LINE_STATUS, "#n #s \"#m\"",
msg->prefix, "has changed the topic to", topic);
}
}
static void
irc_handle_wallops (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix || msg->params.len < 1)
return;
const char *message = msg->params.vector[0];
log_server (s, s->buffer, 0, 0, "<#n> #m", msg->prefix, message);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static struct irc_handler g_irc_handlers[] =
{
// This list needs to stay sorted
{ "AUTHENTICATE", irc_handle_authenticate },
{ "AWAY", irc_handle_away },
{ "CAP", irc_handle_cap },
{ "CHGHOST", irc_handle_chghost },
{ "ERROR", irc_handle_error },
{ "INVITE", irc_handle_invite },
{ "JOIN", irc_handle_join },
{ "KICK", irc_handle_kick },
{ "KILL", irc_handle_kill },
{ "MODE", irc_handle_mode },
{ "NICK", irc_handle_nick },
{ "NOTICE", irc_handle_notice },
{ "PART", irc_handle_part },
{ "PING", irc_handle_ping },
{ "PRIVMSG", irc_handle_privmsg },
{ "QUIT", irc_handle_quit },
{ "TAGMSG", irc_handle_tagmsg },
{ "TOPIC", irc_handle_topic },
{ "WALLOPS", irc_handle_wallops },
};
static bool
irc_try_parse_word_for_userhost (struct server *s, const char *word)
{
regex_t re;
int err = regcomp (&re, "^[^!@]+!([^!@]+@[^!@]+)$", REG_EXTENDED);
if (!soft_assert (!err))
return false;
regmatch_t matches[2];
bool result = false;
if (!regexec (&re, word, 2, matches, 0))
{
cstr_set (&s->irc_user_host, xstrndup (word + matches[1].rm_so,
matches[1].rm_eo - matches[1].rm_so));
result = true;
}
regfree (&re);
return result;
}
static void
irc_try_parse_welcome_for_userhost (struct server *s, const char *m)
{
struct strv v = strv_make ();
cstr_split (m, " ", true, &v);
for (size_t i = 0; i < v.len; i++)
if (irc_try_parse_word_for_userhost (s, v.vector[i]))
break;
strv_free (&v);
}
static bool process_input_line
(struct app_context *, struct buffer *, const char *, int);
static void on_autoaway_timer (struct app_context *ctx);
static void
irc_on_registered (struct server *s, const char *nickname)
{
s->irc_user = irc_get_or_make_user (s, nickname);
str_reset (&s->irc_user_mode);
cstr_set (&s->irc_user_host, NULL);
irc_set_state (s, IRC_REGISTERED);
// XXX: we can also use WHOIS if it's not supported (optional by RFC 2812)
// TODO: maybe rather always use RPL_ISUPPORT NICKLEN & USERLEN & HOSTLEN
// since we don't seem to follow any subsequent changes in userhost;
// unrealircd sends RPL_HOSTHIDDEN (396), which has an optional user part,
// and there is also CAP CHGHOST which /may/ send it to ourselves
irc_send (s, "USERHOST %s", s->irc_user->nickname);
// A little hack that reinstates auto-away status when we get disconnected
if (s->autoaway_active)
on_autoaway_timer (s->ctx);
const char *command = get_config_string (s->config, "command");
if (command)
{
log_server_debug (s, "Executing \"#s\"", command);
(void) process_input_line (s->ctx, s->buffer, command, 0);
}
int64_t command_delay = get_config_integer (s->config, "command_delay");
log_server_debug (s, "Autojoining channels in #&s seconds...",
xstrdup_printf ("%" PRId64, command_delay));
poller_timer_set (&s->autojoin_tmr, command_delay * 1000);
}
static void
irc_handle_rpl_userhost (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return;
const char *response = msg->params.vector[1];
struct strv v = strv_make ();
cstr_split (response, " ", true, &v);
for (size_t i = 0; i < v.len; i++)
{
char *nick = v.vector[i];
char *equals = strchr (nick, '=');
if (!equals || equals == nick)
continue;
// User is an IRC operator
if (equals[-1] == '*')
equals[-1] = '\0';
else
equals[ 0] = '\0';
// TODO: make use of this (away status polling?)
char away_status = equals[1];
if (!strchr ("+-", away_status))
continue;
char *userhost = equals + 2;
if (irc_is_this_us (s, nick))
cstr_set (&s->irc_user_host, xstrdup (userhost));
}
strv_free (&v);
}
static void
irc_handle_rpl_umodeis (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return;
str_reset (&s->irc_user_mode);
irc_handle_mode_user (s, msg->params.vector + 1);
// XXX: do we want to log a message?
}
static void
irc_handle_rpl_namreply (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 4)
return;
const char *channel_name = msg->params.vector[2];
const char *nicks = msg->params.vector[3];
// Just push the nicknames to a string vector to process later
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
if (channel)
cstr_split (nicks, " ", true, &channel->names_buf);
else
log_server_status (s, s->buffer, "Users on #S: #S",
channel_name, nicks);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct channel_user_sort_entry
{
struct server *s; ///< Server (because of the qsort API)
struct channel_user *channel_user; ///< Channel user
};
static int
channel_user_sort_entry_cmp (const void *entry_a, const void *entry_b)
{
const struct channel_user_sort_entry *a = entry_a;
const struct channel_user_sort_entry *b = entry_b;
struct server *s = a->s;
// First order by the most significant channel user prefix
const char *prio_a = strchr (s->irc_chanuser_prefixes,
a->channel_user->prefixes[0]);
const char *prio_b = strchr (s->irc_chanuser_prefixes,
b->channel_user->prefixes[0]);
// Put unrecognized prefixes at the end of the list
if (prio_a || prio_b)
{
if (!prio_a) return 1;
if (!prio_b) return -1;
if (prio_a != prio_b)
return prio_a - prio_b;
}
return irc_server_strcmp (s,
a->channel_user->user->nickname,
b->channel_user->user->nickname);
}
static void
irc_sort_channel_users (struct channel *channel)
{
size_t n_users = channel->users_len;
struct channel_user_sort_entry entries[n_users], *p = entries;
LIST_FOR_EACH (struct channel_user, iter, channel->users)
{
p->s = channel->s;
p->channel_user = iter;
p++;
}
qsort (entries, n_users, sizeof *entries, channel_user_sort_entry_cmp);
channel->users = NULL;
while (p-- != entries)
LIST_PREPEND (channel->users, p->channel_user);
}
static char *
make_channel_users_list (struct channel *channel)
{
size_t n_users = channel->users_len;
struct channel_user_sort_entry entries[n_users], *p = entries;
LIST_FOR_EACH (struct channel_user, iter, channel->users)
{
p->s = channel->s;
p->channel_user = iter;
p++;
}
qsort (entries, n_users, sizeof *entries, channel_user_sort_entry_cmp);
// Make names of users that are away italicised, constructing a formatter
// and adding a new attribute seems like unnecessary work
struct str list = str_make ();
for (size_t i = 0; i < n_users; i++)
{
struct channel_user *channel_user = entries[i].channel_user;
if (channel_user->user->away) str_append_c (&list, '\x1d');
irc_get_channel_user_prefix (channel->s, channel_user, &list);
str_append (&list, channel_user->user->nickname);
if (channel_user->user->away) str_append_c (&list, '\x1d');
str_append_c (&list, ' ');
}
if (list.len)
list.str[--list.len] = '\0';
return str_steal (&list);
}
static void
irc_sync_channel_user (struct channel *channel, const char *nickname,
const char *prefixes)
{
struct user *user = irc_get_or_make_user (channel->s, nickname);
struct channel_user *channel_user =
irc_channel_get_user (channel, user);
if (!channel_user)
{
irc_channel_link_user (channel, user, prefixes);
return;
}
user_unref (user);
// If our idea of the user's modes disagrees with what the server's
// sent us (the most powerful modes differ), use the latter one
if (channel_user->prefixes[0] != prefixes[0])
cstr_set (&channel_user->prefixes, xstrdup (prefixes));
}
static void
irc_process_names_finish (struct channel *channel)
{
struct server *s = channel->s;
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel->name);
if (buffer)
{
log_server_status (channel->s, buffer, "Users on #S: #&m",
channel->name, make_channel_users_list (channel));
}
}
static void
irc_process_names (struct channel *channel)
{
struct str_map present = str_map_make (NULL);
present.key_xfrm = channel->s->irc_strxfrm;
// Either that, or there is no other inhabitant, and sorting does nothing
bool we_have_just_joined = channel->users_len == 1;
struct strv *updates = &channel->names_buf;
for (size_t i = 0; i < updates->len; i++)
{
const char *item = updates->vector[i];
size_t n_prefixes = strspn (item, channel->s->irc_chanuser_prefixes);
const char *nickname = item + n_prefixes;
// Store the nickname in a hashset
str_map_set (&present, nickname, (void *) 1);
char *prefixes = xstrndup (item, n_prefixes);
irc_sync_channel_user (channel, nickname, prefixes);
free (prefixes);
}
// Get rid of channel users missing from "updates"
LIST_FOR_EACH (struct channel_user, iter, channel->users)
if (!str_map_find (&present, iter->user->nickname))
irc_channel_unlink_user (channel, iter);
str_map_free (&present);
strv_reset (&channel->names_buf);
if (we_have_just_joined)
irc_sort_channel_users (channel);
if (!channel->show_names_after_who)
irc_process_names_finish (channel);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
irc_handle_rpl_endofnames (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return;
const char *channel_name = msg->params.vector[1];
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
if (!strcmp (channel_name, "*"))
{
struct str_map_iter iter = str_map_iter_make (&s->irc_channels);
struct channel *channel;
while ((channel = str_map_iter_next (&iter)))
irc_process_names (channel);
}
else if (channel)
irc_process_names (channel);
}
static bool
irc_handle_rpl_whoreply (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 7)
return false;
// Sequence: channel, user, host, server, nick, chars
const char *channel_name = msg->params.vector[1];
const char *nickname = msg->params.vector[5];
const char *chars = msg->params.vector[6];
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct user *user = str_map_find (&s->irc_users, nickname);
// This makes sense to set only with the away-notify capability so far.
if (!channel || !channel->show_names_after_who)
return false;
// We track ourselves by other means and we can't track PM-only users yet.
if (user && user != s->irc_user && user->channels)
user->away = *chars == 'G';
return true;
}
static bool
irc_handle_rpl_endofwho (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return false;
const char *target = msg->params.vector[1];
struct channel *channel = str_map_find (&s->irc_channels, target);
if (!channel || !channel->show_names_after_who)
return false;
irc_process_names_finish (channel);
channel->show_names_after_who = false;
return true;
}
static void
irc_handle_rpl_topic (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 3)
return;
const char *channel_name = msg->params.vector[1];
const char *topic = msg->params.vector[2];
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
if (channel)
cstr_set (&channel->topic, xstrdup (topic));
if (buffer)
log_server_status (s, buffer, "The topic is: #m", topic);
}
static void
irc_handle_rpl_channelmodeis (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return;
const char *channel_name = msg->params.vector[1];
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
if (channel)
{
str_reset (&channel->no_param_modes);
str_map_clear (&channel->param_modes);
irc_handle_mode_channel (channel, msg->params.vector + 1);
}
// XXX: do we want to log a message?
}
static char *
make_time_string (time_t time)
{
char buf[32];
struct tm tm;
strftime (buf, sizeof buf, "%a %b %d %Y %T", localtime_r (&time, &tm));
return xstrdup (buf);
}
static void
irc_handle_rpl_creationtime (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 3)
return;
const char *channel_name = msg->params.vector[1];
const char *creation_time = msg->params.vector[2];
unsigned long created;
if (!xstrtoul (&created, creation_time, 10))
return;
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
if (buffer)
{
log_server_status (s, buffer, "Channel created on #&s",
make_time_string (created));
}
}
static void
irc_handle_rpl_topicwhotime (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 4)
return;
const char *channel_name = msg->params.vector[1];
const char *who = msg->params.vector[2];
const char *change_time = msg->params.vector[3];
unsigned long changed;
if (!xstrtoul (&changed, change_time, 10))
return;
struct channel *channel = str_map_find (&s->irc_channels, channel_name);
struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
hard_assert (channel || !buffer);
if (buffer)
{
log_server_status (s, buffer, "Topic set by #N on #&s",
who, make_time_string (changed));
}
}
static void
irc_handle_rpl_inviting (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 3)
return;
const char *nickname = msg->params.vector[1];
const char *channel_name = msg->params.vector[2];
struct buffer *buffer;
if (!(buffer = str_map_find (&s->irc_buffer_map, channel_name)))
buffer = s->buffer;
log_server_status (s, buffer,
"You have invited #n to #S", nickname, channel_name);
}
static void
irc_handle_err_nicknameinuse (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return;
log_server_error (s, s->buffer,
"Nickname is already in use: #S", msg->params.vector[1]);
// Only do this while we haven't successfully registered yet
if (s->state != IRC_CONNECTED)
return;
char *nickname = irc_fetch_next_nickname (s);
if (nickname)
{
log_server_status (s, s->buffer, "Retrying with #s...", nickname);
irc_send (s, "NICK :%s", nickname);
free (nickname);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
irc_handle_isupport_prefix (struct server *s, char *value)
{
char *modes = value;
char *prefixes = strchr (value, ')');
size_t n_prefixes = prefixes - modes;
if (*modes++ != '(' || !prefixes++ || strlen (value) != 2 * n_prefixes--)
return;
cstr_set (&s->irc_chanuser_modes, xstrndup (modes, n_prefixes));
cstr_set (&s->irc_chanuser_prefixes, xstrndup (prefixes, n_prefixes));
}
static void
irc_handle_isupport_casemapping (struct server *s, char *value)
{
if (!strcmp (value, "ascii"))
irc_set_casemapping (s, tolower_ascii, tolower_ascii_strxfrm);
else if (!strcmp (value, "rfc1459"))
irc_set_casemapping (s, irc_tolower, irc_strxfrm);
else if (!strcmp (value, "rfc1459-strict"))
irc_set_casemapping (s, irc_tolower_strict, irc_strxfrm_strict);
}
static void
irc_handle_isupport_chantypes (struct server *s, char *value)
{
cstr_set (&s->irc_chantypes, xstrdup (value));
}
static void
irc_handle_isupport_idchan (struct server *s, char *value)
{
struct str prefixes = str_make ();
struct strv v = strv_make ();
cstr_split (value, ",", true, &v);
for (size_t i = 0; i < v.len; i++)
{
// Not using or validating the numeric part
const char *pair = v.vector[i];
const char *colon = strchr (pair, ':');
if (colon)
str_append_data (&prefixes, pair, colon - pair);
}
strv_free (&v);
cstr_set (&s->irc_idchan_prefixes, str_steal (&prefixes));
}
static void
irc_handle_isupport_statusmsg (struct server *s, char *value)
{
cstr_set (&s->irc_statusmsg, xstrdup (value));
}
static void
irc_handle_isupport_extban (struct server *s, char *value)
{
s->irc_extban_prefix = 0;
if (*value && *value != ',')
s->irc_extban_prefix = *value++;
cstr_set (&s->irc_extban_types, xstrdup (*value == ',' ? ++value : ""));
}
static void
irc_handle_isupport_chanmodes (struct server *s, char *value)
{
struct strv v = strv_make ();
cstr_split (value, ",", true, &v);
if (v.len >= 4)
{
cstr_set (&s->irc_chanmodes_list, xstrdup (v.vector[0]));
cstr_set (&s->irc_chanmodes_param_always, xstrdup (v.vector[1]));
cstr_set (&s->irc_chanmodes_param_when_set, xstrdup (v.vector[2]));
cstr_set (&s->irc_chanmodes_param_never, xstrdup (v.vector[3]));
}
strv_free (&v);
}
static void
irc_handle_isupport_modes (struct server *s, char *value)
{
unsigned long modes;
if (!*value)
s->irc_max_modes = UINT_MAX;
else if (xstrtoul (&modes, value, 10) && modes && modes <= UINT_MAX)
s->irc_max_modes = modes;
}
static void
unescape_isupport_value (const char *value, struct str *output)
{
const char *alphabet = "0123456789abcdef", *a, *b;
for (const char *p = value; *p; p++)
{
if (p[0] == '\\'
&& p[1] == 'x'
&& p[2] && (a = strchr (alphabet, tolower_ascii (p[2])))
&& p[3] && (b = strchr (alphabet, tolower_ascii (p[3]))))
{
str_append_c (output, (a - alphabet) << 4 | (b - alphabet));
p += 3;
}
else
str_append_c (output, *p);
}
}
static void
dispatch_isupport (struct server *s, const char *name, char *value)
{
#define MATCH(from, to) if (!strcmp (name, (from))) { (to) (s, value); return; }
// TODO: also make use of TARGMAX to split client commands as necessary
MATCH ("PREFIX", irc_handle_isupport_prefix);
MATCH ("CASEMAPPING", irc_handle_isupport_casemapping);
MATCH ("CHANTYPES", irc_handle_isupport_chantypes);
MATCH ("IDCHAN", irc_handle_isupport_idchan);
MATCH ("STATUSMSG", irc_handle_isupport_statusmsg);
MATCH ("EXTBAN", irc_handle_isupport_extban);
MATCH ("CHANMODES", irc_handle_isupport_chanmodes);
MATCH ("MODES", irc_handle_isupport_modes);
#undef MATCH
}
static void
irc_handle_rpl_isupport (struct server *s, const struct irc_message *msg)
{
if (msg->params.len < 2)
return;
for (size_t i = 1; i < msg->params.len - 1; i++)
{
// TODO: if the parameter starts with "-", it resets to default
char *param = msg->params.vector[i];
char *value = param + strcspn (param, "=");
if (*value) *value++ = '\0';
struct str value_unescaped = str_make ();
unescape_isupport_value (value, &value_unescaped);
dispatch_isupport (s, param, value_unescaped.str);
str_free (&value_unescaped);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
irc_adjust_motd (char **motd)
{
// Heuristic, force MOTD to be monospace in graphical frontends.
if (!strchr (*motd, '\x11'))
{
struct str s = str_make ();
str_append_c (&s, '\x11');
for (const char *p = *motd; *p; p++)
{
str_append_c (&s, *p);
if (*p == '\x0f')
str_append_c (&s, '\x11');
}
cstr_set (motd, str_steal (&s));
}
}
static void
irc_process_numeric (struct server *s,
const struct irc_message *msg, unsigned long numeric)
{
// Numerics typically have human-readable information
// Get rid of the first parameter, if there's any at all,
// as it contains our nickname and is of no practical use to the user
struct strv copy = strv_make ();
strv_append_vector (&copy, msg->params.vector + !!msg->params.len);
struct buffer *buffer = s->buffer;
int flags = 0;
switch (numeric)
{
case IRC_RPL_WELCOME:
irc_on_registered (s, msg->params.vector[0]);
// We still issue a USERHOST anyway as this is in general unreliable
if (msg->params.len == 2)
irc_try_parse_welcome_for_userhost (s, msg->params.vector[1]);
break;
case IRC_RPL_MOTDSTART:
case IRC_RPL_MOTD:
if (copy.len)
irc_adjust_motd (&copy.vector[0]);
break;
case IRC_RPL_ISUPPORT:
irc_handle_rpl_isupport (s, msg); break;
case IRC_RPL_USERHOST:
irc_handle_rpl_userhost (s, msg); break;
case IRC_RPL_UMODEIS:
irc_handle_rpl_umodeis (s, msg); buffer = NULL; break;
case IRC_RPL_NAMREPLY:
irc_handle_rpl_namreply (s, msg); buffer = NULL; break;
case IRC_RPL_ENDOFNAMES:
irc_handle_rpl_endofnames (s, msg); buffer = NULL; break;
case IRC_RPL_TOPIC:
irc_handle_rpl_topic (s, msg); buffer = NULL; break;
case IRC_RPL_CHANNELMODEIS:
irc_handle_rpl_channelmodeis (s, msg); buffer = NULL; break;
case IRC_RPL_CREATIONTIME:
irc_handle_rpl_creationtime (s, msg); buffer = NULL; break;
case IRC_RPL_TOPICWHOTIME:
irc_handle_rpl_topicwhotime (s, msg); buffer = NULL; break;
case IRC_RPL_INVITING:
irc_handle_rpl_inviting (s, msg); buffer = NULL; break;
case IRC_ERR_NICKNAMEINUSE:
irc_handle_err_nicknameinuse (s, msg); buffer = NULL; break;
// Auto-away spams server buffers with activity
case IRC_RPL_NOWAWAY:
flags |= BUFFER_LINE_UNIMPORTANT;
if (s->irc_user) s->irc_user->away = true;
break;
case IRC_RPL_UNAWAY:
flags |= BUFFER_LINE_UNIMPORTANT;
if (s->irc_user) s->irc_user->away = false;
break;
case IRC_RPL_WHOREPLY:
if (irc_handle_rpl_whoreply (s, msg)) buffer = NULL;
break;
case IRC_RPL_ENDOFWHO:
if (irc_handle_rpl_endofwho (s, msg)) buffer = NULL;
break;
case IRC_ERR_NICKLOCKED:
case IRC_RPL_SASLSUCCESS:
case IRC_ERR_SASLFAIL:
case IRC_ERR_SASLTOOLONG:
case IRC_ERR_SASLABORTED:
case IRC_ERR_SASLALREADY:
irc_try_finish_cap_negotiation (s);
break;
case IRC_RPL_LIST:
case IRC_ERR_UNKNOWNCOMMAND:
case IRC_ERR_NEEDMOREPARAMS:
// Just preventing these commands from getting printed in a more
// specific buffer as that would be unwanted
break;
default:
// If the second parameter is something we have a buffer for
// (a channel, a PM buffer), log it in that buffer. This is very basic.
// TODO: whitelist/blacklist a lot more replies in here.
// TODO: we should either strip the first parameter from the resulting
// buffer line, or at least put it in brackets
if (msg->params.len < 2)
break;
struct buffer *x;
if ((x = str_map_find (&s->irc_buffer_map, msg->params.vector[1])))
buffer = x;
// A JOIN request should be split at commas,
// then for each element produce either a JOIN response, or a numeric.
(void) irc_satisfy_join (s, msg->params.vector[1]);
}
if (buffer)
{
// Join the parameter vector back and send it to the server buffer
log_server (s, buffer, flags, BUFFER_LINE_STATUS,
"#&m", strv_join (&copy, " "));
}
strv_free (&copy);
}
static void
irc_sanitize_cut_off_utf8 (char **line)
{
// A variation on utf8_validate(), we need to detect the -2 return
const char *p = *line, *end = strchr (p, 0);
int32_t codepoint;
while ((codepoint = utf8_decode (&p, end - p)) >= 0
&& utf8_validate_cp (codepoint))
;
if (codepoint != -2)
return;
struct str fixed_up = str_make ();
str_append_data (&fixed_up, *line, p - *line);
str_append (&fixed_up, "\xEF\xBF\xBD" /* U+FFFD */);
cstr_set (line, str_steal (&fixed_up));
}
static void
irc_process_message (const struct irc_message *msg, struct server *s)
{
if (msg->params.len)
irc_sanitize_cut_off_utf8 (&msg->params.vector[msg->params.len - 1]);
// TODO: make use of IRCv3.2 server-time (with fallback to unixtime_msec())
// -> change all calls to log_{server,nick,chghost,outcoming,ctcp}*()
// to take an extra numeric argument specifying time
struct irc_handler key = { .name = msg->command };
struct irc_handler *handler = bsearch (&key, g_irc_handlers,
N_ELEMENTS (g_irc_handlers), sizeof key, irc_handler_cmp_by_name);
if (handler)
handler->handler (s, msg);
unsigned long numeric;
if (xstrtoul (&numeric, msg->command, 10))
irc_process_numeric (s, msg, numeric);
// Better always make sure everything is in sync rather than care about
// each case explicitly whether anything might have changed
refresh_prompt (s->ctx);
}
// --- Message autosplitting magic ---------------------------------------------
// This is a rather basic algorithm; something like ICU with proper
// locale specification would be needed to make it work better.
static size_t
wrap_text_for_single_line (const char *text, struct irc_char_attrs *attrs,
size_t text_len, size_t target_len, struct str *output)
{
size_t eaten = 0;
// First try going word by word
const char *word_start;
const char *word_end = text + strcspn (text, " ");
size_t word_len = word_end - text;
while (target_len && word_len <= target_len)
{
if (word_len)
{
str_append_data (output, text, word_len);
text += word_len;
eaten += word_len;
target_len -= word_len;
}
// Find the next word's end
word_start = text + strspn (text, " ");
word_end = word_start + strcspn (word_start, " ");
word_len = word_end - text;
}
if (eaten)
// Discard whitespace between words if split
return eaten + (word_start - text);
// And if that doesn't help, cut the longest valid block of characters
for (size_t i = 1; i <= text_len && i <= target_len; i++)
if (i == text_len || attrs[i].starts_at_boundary)
eaten = i;
str_append_data (output, text, eaten);
return eaten;
}
// In practice, this should never fail at all, although it's not guaranteed
static bool
wrap_message (const char *message,
int line_max, struct strv *output, struct error **e)
{
size_t message_left = strlen (message), i = 0;
struct irc_char_attrs *attrs = irc_analyze_text (message, message_left);
struct str m = str_make ();
if (line_max <= 0)
goto error;
while (m.len + message_left > (size_t) line_max)
{
size_t eaten = wrap_text_for_single_line
(message + i, attrs + i, message_left, line_max - m.len, &m);
if (!eaten)
goto error;
strv_append_owned (output, str_steal (&m));
m = str_make ();
i += eaten;
if (!(message_left -= eaten))
break;
irc_serialize_char_attrs (attrs + i, &m);
if (m.len >= (size_t) line_max)
{
print_debug ("formatting continuation too long");
str_reset (&m);
}
}
if (message_left)
strv_append_owned (output,
xstrdup_printf ("%s%s", m.str, message + i));
free (attrs);
str_free (&m);
return true;
error:
free (attrs);
str_free (&m);
return error_set (e,
"Message splitting was unsuccessful as there was "
"too little room for UTF-8 characters");
}
/// Automatically splits messages that arrive at other clients with our prefix
/// so that they don't arrive cut off by the server
static bool
irc_autosplit_message (struct server *s, const char *message,
int fixed_part, struct strv *output, struct error **e)
{
// :<nick>!<user>@<host> <fixed-part><message>
int space_in_one_message = 0;
if (s->irc_user && s->irc_user_host)
space_in_one_message = 510
- 1 - (int) strlen (s->irc_user->nickname)
- 1 - (int) strlen (s->irc_user_host)
- 1 - fixed_part;
// Multiline messages can be triggered through hooks and plugins.
struct strv lines = strv_make ();
cstr_split (message, "\r\n", false, &lines);
bool success = true;
for (size_t i = 0; i < lines.len; i++)
{
// We don't always have the full info for message splitting.
if (!space_in_one_message)
strv_append (output, lines.vector[i]);
else if (!(success =
wrap_message (lines.vector[i], space_in_one_message, output, e)))
break;
}
strv_free (&lines);
return success;
}
static void
send_autosplit_message (struct server *s,
const char *command, const char *target, const char *message,
const char *prefix, const char *suffix)
{
struct buffer *buffer = str_map_find (&s->irc_buffer_map, target);
// "COMMAND target * :prefix*suffix"
int fixed_part = strlen (command) + 1 + strlen (target) + 1 + 1
+ strlen (prefix) + strlen (suffix);
struct strv lines = strv_make ();
struct error *e = NULL;
if (!irc_autosplit_message (s, message, fixed_part, &lines, &e))
{
log_server_error (s, buffer ? buffer : s->buffer, "#s", e->message);
error_free (e);
}
else
{
for (size_t i = 0; i < lines.len; i++)
irc_send (s, "%s %s :%s%s%s", command, target,
prefix, lines.vector[i], suffix);
}
strv_free (&lines);
}
#define SEND_AUTOSPLIT_ACTION(s, target, message) \
send_autosplit_message ((s), "PRIVMSG", (target), (message), \
"\x01" "ACTION ", "\x01")
#define SEND_AUTOSPLIT_PRIVMSG(s, target, message) \
send_autosplit_message ((s), "PRIVMSG", (target), (message), "", "")
#define SEND_AUTOSPLIT_NOTICE(s, target, message) \
send_autosplit_message ((s), "NOTICE", (target), (message), "", "")
// --- Configuration dumper ----------------------------------------------------
struct config_dump_data
{
struct strv path; ///< Levels
struct strv *output; ///< Where to place new entries
};
static void config_dump_item
(struct config_item *item, struct config_dump_data *data);
static void
config_dump_children
(struct config_item *object, struct config_dump_data *data)
{
hard_assert (object->type == CONFIG_ITEM_OBJECT);
struct str_map_iter iter = str_map_iter_make (&object->value.object);
struct config_item *child;
while ((child = str_map_iter_next (&iter)))
{
strv_append_owned (&data->path, iter.link->key);
config_dump_item (child, data);
strv_steal (&data->path, data->path.len - 1);
}
}
static void
config_dump_item (struct config_item *item, struct config_dump_data *data)
{
// Empty objects will show as such
if (item->type == CONFIG_ITEM_OBJECT
&& item->value.object.len)
{
config_dump_children (item, data);
return;
}
// Currently there's no reason for us to dump unknown items
struct config_schema *schema = item->schema;
if (!schema)
return;
struct str line = str_make ();
if (data->path.len)
str_append (&line, data->path.vector[0]);
for (size_t i = 1; i < data->path.len; i++)
str_append_printf (&line, ".%s", data->path.vector[i]);
struct str value = str_make ();
config_item_write (item, false, &value);
// Don't bother writing out null values everywhere
bool has_default = schema && schema->default_;
if (item->type != CONFIG_ITEM_NULL || has_default)
{
str_append (&line, " = ");
str_append_str (&line, &value);
}
if (!schema)
str_append (&line, " (unrecognized)");
else if (has_default && strcmp (schema->default_, value.str))
str_append_printf (&line, " (default: %s)", schema->default_);
else if (!has_default && item->type != CONFIG_ITEM_NULL)
str_append_printf (&line, " (default: %s)", "null");
str_free (&value);
strv_append_owned (data->output, str_steal (&line));
}
static void
config_dump (struct config_item *root, struct strv *output)
{
struct config_dump_data data;
data.path = strv_make ();
data.output = output;
config_dump_item (root, &data);
hard_assert (!data.path.len);
strv_free (&data.path);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
strv_sort_cb (const void *a, const void *b)
{
return strcmp (*(const char **) a, *(const char **) b);
}
static void
strv_sort (struct strv *self)
{
qsort (self->vector, self->len, sizeof *self->vector, strv_sort_cb);
}
static void
dump_matching_options
(struct config_item *root, const char *mask, struct strv *output)
{
config_dump (root, output);
strv_sort (output);
// Filter out results by wildcard matching
for (size_t i = 0; i < output->len; i++)
{
// Yeah, I know
char *key = cstr_cut_until (output->vector[i], " ");
if (fnmatch (mask, key, 0))
strv_remove (output, i--);
free (key);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
save_configuration (struct app_context *ctx)
{
struct str data = str_make ();
serialize_configuration (ctx->config.root, &data);
struct error *e = NULL;
char *filename = write_configuration_file (NULL, &data, &e);
str_free (&data);
if (!filename)
{
log_global_error (ctx,
"#s: #s", "Saving configuration failed", e->message);
error_free (e);
}
else
log_global_status (ctx, "Configuration written to `#s'", filename);
free (filename);
}
// --- Server management -------------------------------------------------------
static bool
validate_server_name (const char *name)
{
for (const unsigned char *p = (const unsigned char *) name; *p; p++)
if (iscntrl_ascii (*p) || *p == '.')
return false;
return true;
}
static const char *
check_server_name_for_addition (struct app_context *ctx, const char *name)
{
if (!strcasecmp_ascii (name, ctx->global_buffer->name))
return "name collides with the global buffer";
if (str_map_find (&ctx->servers, name))
return "server already exists";
if (!validate_server_name (name))
return "invalid server name";
return NULL;
}
static struct server *
server_add (struct app_context *ctx,
const char *name, struct config_item *subtree)
{
hard_assert (!str_map_find (&ctx->servers, name));
struct server *s = server_new (&ctx->poller);
s->ctx = ctx;
s->name = xstrdup (name);
str_map_set (&ctx->servers, s->name, s);
s->config = subtree;
// Add a buffer and activate it
struct buffer *buffer = s->buffer = buffer_new (ctx->input,
BUFFER_SERVER, irc_make_buffer_name (s, NULL));
buffer->server = s;
buffer_add (ctx, buffer);
buffer_activate (ctx, buffer);
config_schema_apply_to_object (g_config_server, subtree, s);
config_schema_call_changed (subtree);
if (get_config_boolean (s->config, "autoconnect"))
// Connect to the server ASAP
poller_timer_set (&s->reconnect_tmr, 0);
return s;
}
static void
server_add_new (struct app_context *ctx, const char *name)
{
// Note that there may already be something in the configuration under
// that key that we've ignored earlier, and there may also be
// a case-insensitive conflict. Those things may only happen as a result
// of manual edits to the configuration, though, and they're not really
// going to break anything. They only cause surprises when loading.
struct str_map *servers = get_servers_config (ctx);
struct config_item *subtree = config_item_object ();
str_map_set (servers, name, subtree);
struct server *s = server_add (ctx, name, subtree);
struct error *e = NULL;
if (!irc_autofill_user_info (s, &e))
{
log_server_error (s, s->buffer,
"#s: #s", "Failed to fill in user details", e->message);
error_free (e);
}
}
static void
server_remove (struct app_context *ctx, struct server *s)
{
hard_assert (!irc_is_connected (s));
if (s->buffer)
buffer_remove_safe (ctx, s->buffer);
relay_prepare_server_remove (ctx, s);
relay_broadcast (ctx);
struct str_map_unset_iter iter =
str_map_unset_iter_make (&s->irc_buffer_map);
struct buffer *buffer;
while ((buffer = str_map_unset_iter_next (&iter)))
buffer_remove_safe (ctx, buffer);
str_map_unset_iter_free (&iter);
hard_assert (!s->buffer);
hard_assert (!s->irc_buffer_map.len);
hard_assert (!s->irc_channels.len);
soft_assert (!s->irc_users.len);
str_map_set (get_servers_config (ctx), s->name, NULL);
s->config = NULL;
// This actually destroys the server as it's owned by the map
str_map_set (&ctx->servers, s->name, NULL);
}
static void
server_rename (struct app_context *ctx, struct server *s, const char *new_name)
{
hard_assert (!str_map_find (&ctx->servers, new_name));
relay_prepare_server_rename (ctx, s, new_name);
relay_broadcast (ctx);
str_map_set (&ctx->servers, new_name,
str_map_steal (&ctx->servers, s->name));
struct str_map *servers = get_servers_config (ctx);
str_map_set (servers, new_name, str_map_steal (servers, s->name));
cstr_set (&s->name, xstrdup (new_name));
buffer_rename (ctx, s->buffer, new_name);
struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
struct buffer *buffer;
while ((buffer = str_map_iter_next (&iter)))
{
char *x = NULL;
switch (buffer->type)
{
case BUFFER_PM:
x = irc_make_buffer_name (s, buffer->user->nickname);
break;
case BUFFER_CHANNEL:
x = irc_make_buffer_name (s, buffer->channel->name);
break;
default:
hard_assert (!"unexpected type of server-related buffer");
}
buffer_rename (ctx, buffer, x);
free (x);
}
}
// --- Plugins -----------------------------------------------------------------
/// Returns the basename of the plugin's name without any extensions,
/// or NULL if the name isn't suitable (starts with a dot)
static char *
plugin_config_name (struct plugin *self)
{
const char *begin = self->name;
for (const char *p = begin; *p; )
if (*p++ == '/')
begin = p;
size_t len = strcspn (begin, ".");
if (!len)
return NULL;
// XXX: we might also allow arbitrary strings as object keys (except dots)
char *copy = xstrndup (begin, len);
for (char *p = copy; *p; p++)
if (!config_tokenizer_is_word_char (*p))
*p = '_';
return copy;
}
// --- Lua ---------------------------------------------------------------------
// Each plugin has its own Lua state object, so that a/ they don't disturb each
// other and b/ unloading a plugin releases all resources.
//
// References to internal objects (buffers, servers) are all weak.
#ifdef HAVE_LUA
struct lua_plugin
{
struct plugin super; ///< The structure we're deriving
struct app_context *ctx; ///< Application context
lua_State *L; ///< Lua state for the main thread
struct lua_schema_item *schemas; ///< Registered schema items
};
static void
lua_plugin_gc (struct plugin *self_)
{
struct lua_plugin *self = (struct lua_plugin *) self_;
lua_gc (self->L, LUA_GCCOLLECT, 0 /* Lua 5.3 required, 5.4 varargs */);
}
static void
lua_plugin_free (struct plugin *self_)
{
struct lua_plugin *self = (struct lua_plugin *) self_;
lua_close (self->L);
}
struct plugin_vtable lua_plugin_vtable =
{
.gc = lua_plugin_gc,
.free = lua_plugin_free,
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// The registry can be used as a cache for weakly referenced objects
static bool
lua_cache_get (lua_State *L, void *object)
{
lua_rawgetp (L, LUA_REGISTRYINDEX, object);
if (lua_isnil (L, -1))
{
lua_pop (L, 1);
return false;
}
return true;
}
static void
lua_cache_store (lua_State *L, void *object, int index)
{
lua_pushvalue (L, index);
lua_rawsetp (L, LUA_REGISTRYINDEX, object);
}
static void
lua_cache_invalidate (lua_State *L, void *object)
{
lua_pushnil (L);
lua_rawsetp (L, LUA_REGISTRYINDEX, object);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/// Append a traceback to all errors so that we can later extract it
static int
lua_plugin_error_handler (lua_State *L)
{
luaL_traceback (L, L, luaL_checkstring (L, 1), 1);
return 1;
}
static bool
lua_plugin_process_error (struct lua_plugin *self, const char *message,
struct error **e)
{
struct strv v = strv_make ();
cstr_split (message, "\n", true, &v);
if (v.len < 2)
error_set (e, "%s", message);
else
{
error_set (e, "%s", v.vector[0]);
log_global_debug (self->ctx, "Lua: plugin \"#s\": #s",
self->super.name, v.vector[1]);
for (size_t i = 2; i < v.len; i++)
log_global_debug (self->ctx, " #s", v.vector[i]);
}
strv_free (&v);
return false;
}
/// Call a Lua function and process errors using our special error handler
static bool
lua_plugin_call (struct lua_plugin *self,
int n_params, int n_results, struct error **e)
{
// XXX: this may eventually be called from a thread, then this is wrong
lua_State *L = self->L;
// We need to pop the error handler at the end
lua_pushcfunction (L, lua_plugin_error_handler);
int error_handler_idx = -n_params - 2;
lua_insert (L, error_handler_idx);
if (!lua_pcall (L, n_params, n_results, error_handler_idx))
{
lua_remove (L, -n_results - 1);
return true;
}
(void) lua_plugin_process_error (self, lua_tostring (L, -1), e);
lua_pop (L, 2);
return false;
}
/// Convenience function; replaces the "original" string or produces an error
static bool
lua_plugin_handle_string_filter_result (struct lua_plugin *self,
char **original, bool utf8, struct error **e)
{
lua_State *L = self->L;
if (lua_isnil (L, -1))
{
cstr_set (original, NULL);
return true;
}
if (!lua_isstring (L, -1))
return error_set (e, "must return either a string or nil");
size_t len;
const char *processed = lua_tolstring (L, -1, &len);
if (utf8 && !utf8_validate (processed, len))
return error_set (e, "must return valid UTF-8");
// Only replace the string if it's different
if (strcmp (processed, *original))
cstr_set (original, xstrdup (processed));
return true;
}
static const char *
lua_plugin_check_utf8 (lua_State *L, int arg)
{
size_t len;
const char *s = luaL_checklstring (L, arg, &len);
luaL_argcheck (L, utf8_validate (s, len), arg, "must be valid UTF-8");
return s;
}
static void
lua_plugin_log_error
(struct lua_plugin *self, const char *where, struct error *error)
{
log_global_error (self->ctx, "Lua: plugin \"#s\": #s: #s",
self->super.name, where, error->message);
error_free (error);
}
/// Pop "n" values from the stack into a table, using their indexes as keys
static void
lua_plugin_pack (lua_State *L, int n)
{
lua_createtable (L, n, 0);
lua_insert (L, -n - 1);
for (int i = n; i; i--)
lua_rawseti (L, -i - 1, i);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
lua_plugin_kv (lua_State *L, const char *key, const char *value)
{
lua_pushstring (L, value);
lua_setfield (L, -2, key);
}
static void
lua_plugin_push_message (lua_State *L, const struct irc_message *msg)
{
lua_createtable (L, 0, 4);
lua_createtable (L, msg->tags.len, 0);
struct str_map_iter iter = str_map_iter_make (&msg->tags);
const char *value;
while ((value = str_map_iter_next (&iter)))
lua_plugin_kv (L, iter.link->key, value);
lua_setfield (L, -2, "tags");
// TODO: parse the prefix further?
if (msg->prefix) lua_plugin_kv (L, "prefix", msg->prefix);
if (msg->command) lua_plugin_kv (L, "command", msg->command);
lua_createtable (L, msg->params.len, 0);
for (size_t i = 0; i < msg->params.len; i++)
{
lua_pushstring (L, msg->params.vector[i]);
lua_rawseti (L, -2, i + 1);
}
lua_setfield (L, -2, "params");
}
static int
lua_plugin_parse (lua_State *L)
{
struct irc_message msg;
irc_parse_message (&msg, luaL_checkstring (L, 1));
lua_plugin_push_message (L, &msg);
irc_free_message (&msg);
return 1;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Lua code can use weakly referenced wrappers for internal objects.
typedef struct weak_ref_link *
(*lua_weak_ref_fn) (void *object, destroy_cb_fn cb, void *user_data);
typedef void (*lua_weak_unref_fn) (void *object, struct weak_ref_link **link);
struct lua_weak_info
{
const char *name; ///< Metatable name
struct ispect_field *ispect; ///< Introspection data
lua_weak_ref_fn ref; ///< Weak link invalidator
lua_weak_unref_fn unref; ///< Weak link generator
};
struct lua_weak
{
struct lua_plugin *plugin; ///< The plugin we belong to
struct lua_weak_info *info; ///< Introspection data
void *object; ///< The object
struct weak_ref_link *weak_ref; ///< A weak reference link
};
static void
lua_weak_invalidate (void *object, void *user_data)
{
struct lua_weak *wrapper = user_data;
wrapper->object = NULL;
wrapper->weak_ref = NULL;
// This can in theory call the GC, order isn't arbitrary here
lua_cache_invalidate (wrapper->plugin->L, object);
}
static void
lua_weak_push (lua_State *L, struct lua_plugin *plugin, void *object,
struct lua_weak_info *info)
{
if (!object)
{
lua_pushnil (L);
return;
}
if (lua_cache_get (L, object))
return;
struct lua_weak *wrapper = lua_newuserdata (L, sizeof *wrapper);
luaL_setmetatable (L, info->name);
wrapper->plugin = plugin;
wrapper->info = info;
wrapper->object = object;
wrapper->weak_ref = NULL;
if (info->ref)
wrapper->weak_ref = info->ref (object, lua_weak_invalidate, wrapper);
lua_cache_store (L, object, -1);
}
static int
lua_weak_gc (lua_State *L, const struct lua_weak_info *info)
{
struct lua_weak *wrapper = luaL_checkudata (L, 1, info->name);
if (wrapper->object)
{
lua_cache_invalidate (L, wrapper->object);
if (info->unref)
info->unref (wrapper->object, &wrapper->weak_ref);
wrapper->object = NULL;
}
return 0;
}
static struct lua_weak *
lua_weak_deref (lua_State *L, const struct lua_weak_info *info)
{
struct lua_weak *weak = luaL_checkudata (L, 1, info->name);
luaL_argcheck (L, weak->object, 1, "dead reference used");
return weak;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#define LUA_WEAK_DECLARE(id, metatable_id) \
static struct lua_weak_info lua_ ## id ## _info = \
{ \
.name = metatable_id, \
.ispect = g_ ## id ## _ispect, \
.ref = (lua_weak_ref_fn) id ## _weak_ref, \
.unref = (lua_weak_unref_fn) id ## _weak_unref, \
};
#define XLUA_USER_METATABLE "user" ///< Identifier for Lua metatable
#define XLUA_CHANNEL_METATABLE "channel" ///< Identifier for Lua metatable
#define XLUA_BUFFER_METATABLE "buffer" ///< Identifier for Lua metatable
#define XLUA_SERVER_METATABLE "server" ///< Identifier for Lua metatable
LUA_WEAK_DECLARE (user, XLUA_USER_METATABLE)
LUA_WEAK_DECLARE (channel, XLUA_CHANNEL_METATABLE)
LUA_WEAK_DECLARE (buffer, XLUA_BUFFER_METATABLE)
LUA_WEAK_DECLARE (server, XLUA_SERVER_METATABLE)
// The global context is kind of fake and doesn't have any ref-counting,
// however it's still very much an object
static struct lua_weak_info lua_ctx_info =
{
.name = PROGRAM_NAME,
.ispect = g_ctx_ispect,
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_user_gc (lua_State *L)
{
return lua_weak_gc (L, &lua_user_info);
}
static int
lua_user_get_channels (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_user_info);
struct user *user = wrapper->object;
int i = 1;
lua_newtable (L);
LIST_FOR_EACH (struct user_channel, iter, user->channels)
{
lua_weak_push (L, wrapper->plugin, iter->channel, &lua_channel_info);
lua_rawseti (L, -2, i++);
}
return 1;
}
static luaL_Reg lua_user_table[] =
{
{ "__gc", lua_user_gc },
{ "get_channels", lua_user_get_channels },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_channel_gc (lua_State *L)
{
return lua_weak_gc (L, &lua_channel_info);
}
static int
lua_channel_get_users (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_channel_info);
struct channel *channel = wrapper->object;
int i = 1;
lua_newtable (L);
LIST_FOR_EACH (struct channel_user, iter, channel->users)
{
lua_createtable (L, 0, 2);
lua_weak_push (L, wrapper->plugin, iter->user, &lua_user_info);
lua_setfield (L, -2, "user");
lua_plugin_kv (L, "prefixes", iter->prefixes);
lua_rawseti (L, -2, i++);
}
return 1;
}
static luaL_Reg lua_channel_table[] =
{
{ "__gc", lua_channel_gc },
{ "get_users", lua_channel_get_users },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_buffer_gc (lua_State *L)
{
return lua_weak_gc (L, &lua_buffer_info);
}
static int
lua_buffer_log (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_buffer_info);
struct buffer *buffer = wrapper->object;
const char *message = lua_plugin_check_utf8 (L, 2);
log_full (wrapper->plugin->ctx, buffer->server, buffer,
0, BUFFER_LINE_STATUS, "#s", message);
return 0;
}
static int
lua_buffer_execute (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_buffer_info);
struct buffer *buffer = wrapper->object;
const char *line = lua_plugin_check_utf8 (L, 2);
(void) process_input_line (wrapper->plugin->ctx, buffer, line, 0);
return 0;
}
static luaL_Reg lua_buffer_table[] =
{
{ "__gc", lua_buffer_gc },
{ "log", lua_buffer_log },
{ "execute", lua_buffer_execute },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_server_gc (lua_State *L)
{
return lua_weak_gc (L, &lua_server_info);
}
static const char *
lua_server_state_to_string (enum server_state state)
{
switch (state)
{
case IRC_DISCONNECTED: return "disconnected";
case IRC_CONNECTING: return "connecting";
case IRC_CONNECTED: return "connected";
case IRC_REGISTERED: return "registered";
case IRC_CLOSING: return "closing";
case IRC_HALF_CLOSED: return "half-closed";
}
return "?";
}
static int
lua_server_get_state (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_server_info);
struct server *server = wrapper->object;
lua_pushstring (L, lua_server_state_to_string (server->state));
return 1;
}
static int
lua_server_send (lua_State *L)
{
struct lua_weak *wrapper = lua_weak_deref (L, &lua_server_info);
struct server *server = wrapper->object;
irc_send (server, "%s", luaL_checkstring (L, 2));
return 0;
}
static luaL_Reg lua_server_table[] =
{
{ "__gc", lua_server_gc },
{ "get_state", lua_server_get_state },
{ "send", lua_server_send },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#define XLUA_HOOK_METATABLE "hook" ///< Identifier for the Lua metatable
enum lua_hook_type
{
XLUA_HOOK_DEFUNCT, ///< No longer functional
XLUA_HOOK_INPUT, ///< Input hook
XLUA_HOOK_IRC, ///< IRC hook
XLUA_HOOK_PROMPT, ///< Prompt hook
XLUA_HOOK_COMPLETION, ///< Autocomplete
};
struct lua_hook
{
struct lua_plugin *plugin; ///< The plugin we belong to
enum lua_hook_type type; ///< Type of the hook
int ref_callback; ///< Reference to the callback
union
{
struct hook hook; ///< Hook base structure
struct input_hook input_hook; ///< Input hook
struct irc_hook irc_hook; ///< IRC hook
struct prompt_hook prompt_hook; ///< IRC hook
struct completion_hook c_hook; ///< Autocomplete hook
}
data; ///< Hook data
};
static int
lua_hook_unhook (lua_State *L)
{
struct lua_hook *hook = luaL_checkudata (L, 1, XLUA_HOOK_METATABLE);
switch (hook->type)
{
case XLUA_HOOK_INPUT:
LIST_UNLINK (hook->plugin->ctx->input_hooks, &hook->data.hook);
break;
case XLUA_HOOK_IRC:
LIST_UNLINK (hook->plugin->ctx->irc_hooks, &hook->data.hook);
break;
case XLUA_HOOK_PROMPT:
LIST_UNLINK (hook->plugin->ctx->prompt_hooks, &hook->data.hook);
refresh_prompt (hook->plugin->ctx);
break;
case XLUA_HOOK_COMPLETION:
LIST_UNLINK (hook->plugin->ctx->completion_hooks, &hook->data.hook);
break;
default:
hard_assert (!"invalid hook type");
case XLUA_HOOK_DEFUNCT:
break;
}
luaL_unref (L, LUA_REGISTRYINDEX, hook->ref_callback);
hook->ref_callback = LUA_REFNIL;
// The hook no longer has to stay alive
hook->type = XLUA_HOOK_DEFUNCT;
lua_cache_invalidate (L, hook);
return 0;
}
// The hook dies either when the plugin requests it or at plugin unload
static luaL_Reg lua_hook_table[] =
{
{ "unhook", lua_hook_unhook },
{ "__gc", lua_hook_unhook },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static char *
lua_input_hook_filter (struct input_hook *self, struct buffer *buffer,
char *input)
{
struct lua_hook *hook =
CONTAINER_OF (self, struct lua_hook, data.input_hook);
struct lua_plugin *plugin = hook->plugin;
lua_State *L = plugin->L;
lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
lua_weak_push (L, plugin, buffer, &lua_buffer_info); // 2: buffer
lua_pushstring (L, input); // 3: input
struct error *e = NULL;
if (lua_plugin_call (plugin, 3, 1, &e))
{
lua_plugin_handle_string_filter_result (plugin, &input, true, &e);
lua_pop (L, 1);
}
if (e)
lua_plugin_log_error (plugin, "input hook", e);
return input;
}
static char *
lua_irc_hook_filter (struct irc_hook *self, struct server *s, char *message)
{
struct lua_hook *hook =
CONTAINER_OF (self, struct lua_hook, data.irc_hook);
struct lua_plugin *plugin = hook->plugin;
lua_State *L = plugin->L;
lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
lua_weak_push (L, plugin, s, &lua_server_info); // 2: server
lua_pushstring (L, message); // 3: message
struct error *e = NULL;
if (lua_plugin_call (plugin, 3, 1, &e))
{
lua_plugin_handle_string_filter_result (plugin, &message, false, &e);
lua_pop (L, 1);
}
if (e)
lua_plugin_log_error (plugin, "IRC hook", e);
return message;
}
static char *
lua_prompt_hook_make (struct prompt_hook *self)
{
struct lua_hook *hook =
CONTAINER_OF (self, struct lua_hook, data.prompt_hook);
struct lua_plugin *plugin = hook->plugin;
lua_State *L = plugin->L;
lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
struct error *e = NULL;
char *prompt = xstrdup ("");
if (lua_plugin_call (plugin, 1, 1, &e))
{
lua_plugin_handle_string_filter_result (plugin, &prompt, true, &e);
lua_pop (L, 1);
}
if (e)
lua_plugin_log_error (plugin, "prompt hook", e);
return prompt;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
lua_plugin_push_completion (lua_State *L, struct completion *data)
{
lua_createtable (L, 0, 3);
lua_pushstring (L, data->line);
lua_setfield (L, -2, "line");
lua_createtable (L, data->words_len, 0);
for (size_t i = 0; i < data->words_len; i++)
{
lua_pushlstring (L, data->line + data->words[i].start,
data->words[i].end - data->words[i].start);
lua_rawseti (L, -2, i + 1);
}
lua_setfield (L, -2, "words");
lua_pushinteger (L, data->location);
lua_setfield (L, -2, "location");
}
static bool
lua_completion_hook_process_value (lua_State *L, struct strv *output,
struct error **e)
{
if (lua_type (L, -1) != LUA_TSTRING)
{
return error_set (e,
"%s: %s", "invalid type", lua_typename (L, lua_type (L, -1)));
}
size_t len;
const char *value = lua_tolstring (L, -1, &len);
if (!utf8_validate (value, len))
return error_set (e, "must be valid UTF-8");
strv_append (output, value);
return true;
}
static bool
lua_completion_hook_process (lua_State *L, struct strv *output,
struct error **e)
{
if (lua_isnil (L, -1))
return true;
if (!lua_istable (L, -1))
return error_set (e, "must return either a table or nil");
bool success = true;
for (lua_Integer i = 1; success && lua_rawgeti (L, -1, i); i++)
if ((success = lua_completion_hook_process_value (L, output, e)))
lua_pop (L, 1);
lua_pop (L, 1);
return success;
}
static void
lua_completion_hook_complete (struct completion_hook *self,
struct completion *data, const char *word, struct strv *output)
{
struct lua_hook *hook =
CONTAINER_OF (self, struct lua_hook, data.c_hook);
struct lua_plugin *plugin = hook->plugin;
lua_State *L = plugin->L;
lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
lua_plugin_push_completion (L, data); // 2: data
lua_weak_push (L, plugin, plugin->ctx->current_buffer, &lua_buffer_info);
lua_setfield (L, -2, "buffer");
lua_pushstring (L, word); // 3: word
struct error *e = NULL;
if (lua_plugin_call (plugin, 3, 1, &e))
{
lua_completion_hook_process (L, output, &e);
lua_pop (L, 1);
}
if (e)
lua_plugin_log_error (plugin, "autocomplete hook", e);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static struct lua_hook *
lua_plugin_push_hook (lua_State *L, struct lua_plugin *plugin,
int callback_index, enum lua_hook_type type, int priority)
{
luaL_checktype (L, callback_index, LUA_TFUNCTION);
struct lua_hook *hook = lua_newuserdata (L, sizeof *hook);
luaL_setmetatable (L, XLUA_HOOK_METATABLE);
memset (hook, 0, sizeof *hook);
hook->data.hook.priority = priority;
hook->type = type;
hook->plugin = plugin;
lua_pushvalue (L, callback_index);
hook->ref_callback = luaL_ref (L, LUA_REGISTRYINDEX);
// Make sure the hook doesn't get garbage collected and return it
lua_cache_store (L, hook, -1);
return hook;
}
static int
lua_plugin_hook_input (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
struct lua_hook *hook = lua_plugin_push_hook
(L, plugin, 1, XLUA_HOOK_INPUT, luaL_optinteger (L, 2, 0));
hook->data.input_hook.filter = lua_input_hook_filter;
plugin->ctx->input_hooks =
hook_insert (plugin->ctx->input_hooks, &hook->data.hook);
return 1;
}
static int
lua_plugin_hook_irc (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
struct lua_hook *hook = lua_plugin_push_hook
(L, plugin, 1, XLUA_HOOK_IRC, luaL_optinteger (L, 2, 0));
hook->data.irc_hook.filter = lua_irc_hook_filter;
plugin->ctx->irc_hooks =
hook_insert (plugin->ctx->irc_hooks, &hook->data.hook);
return 1;
}
static int
lua_plugin_hook_prompt (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
struct lua_hook *hook = lua_plugin_push_hook
(L, plugin, 1, XLUA_HOOK_PROMPT, luaL_optinteger (L, 2, 0));
hook->data.prompt_hook.make = lua_prompt_hook_make;
plugin->ctx->prompt_hooks =
hook_insert (plugin->ctx->prompt_hooks, &hook->data.hook);
refresh_prompt (plugin->ctx);
return 1;
}
static int
lua_plugin_hook_completion (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
struct lua_hook *hook = lua_plugin_push_hook
(L, plugin, 1, XLUA_HOOK_COMPLETION, luaL_optinteger (L, 2, 0));
hook->data.c_hook.complete = lua_completion_hook_complete;
plugin->ctx->completion_hooks =
hook_insert (plugin->ctx->completion_hooks, &hook->data.hook);
return 1;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#define XLUA_SCHEMA_METATABLE "schema" ///< Identifier for the Lua metatable
struct lua_schema_item
{
LIST_HEADER (struct lua_schema_item)
struct lua_plugin *plugin; ///< The plugin we belong to
struct config_item *item; ///< The item managed by the schema
struct config_schema schema; ///< Schema itself
int ref_validate; ///< Reference to "validate" callback
int ref_on_change; ///< Reference to "on_change" callback
};
static void
lua_schema_item_discard (struct lua_schema_item *self)
{
if (self->item)
{
self->item->schema = NULL;
self->item->user_data = NULL;
self->item = NULL;
LIST_UNLINK (self->plugin->schemas, self);
}
// Now that we've disconnected from the item, allow garbage collection
lua_cache_invalidate (self->plugin->L, self);
}
static int
lua_schema_item_gc (lua_State *L)
{
struct lua_schema_item *self =
luaL_checkudata (L, 1, XLUA_SCHEMA_METATABLE);
lua_schema_item_discard (self);
free ((char *) self->schema.name);
free ((char *) self->schema.comment);
free ((char *) self->schema.default_);
luaL_unref (L, LUA_REGISTRYINDEX, self->ref_validate);
luaL_unref (L, LUA_REGISTRYINDEX, self->ref_on_change);
return 0;
}
static luaL_Reg lua_schema_table[] =
{
{ "__gc", lua_schema_item_gc },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/// Unfortunately this has the same problem as JSON libraries in that Lua
/// cannot store null values in containers (it has no distinct "undefined" type)
static void
lua_plugin_push_config_item (lua_State *L, const struct config_item *item)
{
switch (item->type)
{
case CONFIG_ITEM_NULL:
lua_pushnil (L);
break;
case CONFIG_ITEM_OBJECT:
{
lua_createtable (L, 0, item->value.object.len);
struct str_map_iter iter = str_map_iter_make (&item->value.object);
struct config_item *child;
while ((child = str_map_iter_next (&iter)))
{
lua_plugin_push_config_item (L, child);
lua_setfield (L, -2, iter.link->key);
}
break;
}
case CONFIG_ITEM_BOOLEAN:
lua_pushboolean (L, item->value.boolean);
break;
case CONFIG_ITEM_INTEGER:
lua_pushinteger (L, item->value.integer);
break;
case CONFIG_ITEM_STRING:
case CONFIG_ITEM_STRING_ARRAY:
lua_pushlstring (L, item->value.string.str, item->value.string.len);
break;
}
}
static bool
lua_schema_item_validate (const struct config_item *item, struct error **e)
{
struct lua_schema_item *self = item->user_data;
if (self->ref_validate == LUA_REFNIL)
return true;
lua_State *L = self->plugin->L;
lua_rawgeti (L, LUA_REGISTRYINDEX, self->ref_validate);
lua_plugin_push_config_item (L, item);
// The callback can make use of error("...", 0) to produce nice messages
return lua_plugin_call (self->plugin, 1, 0, e);
}
static void
lua_schema_item_on_change (struct config_item *item)
{
struct lua_schema_item *self = item->user_data;
if (self->ref_on_change == LUA_REFNIL)
return;
lua_State *L = self->plugin->L;
lua_rawgeti (L, LUA_REGISTRYINDEX, self->ref_on_change);
lua_plugin_push_config_item (L, item);
struct error *e = NULL;
if (!lua_plugin_call (self->plugin, 1, 0, &e))
lua_plugin_log_error (self->plugin, "schema on_change", e);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_plugin_decode_config_item_type (const char *type)
{
if (!strcmp (type, "null")) return CONFIG_ITEM_NULL;
if (!strcmp (type, "object")) return CONFIG_ITEM_OBJECT;
if (!strcmp (type, "boolean")) return CONFIG_ITEM_BOOLEAN;
if (!strcmp (type, "integer")) return CONFIG_ITEM_INTEGER;
if (!strcmp (type, "string")) return CONFIG_ITEM_STRING;
if (!strcmp (type, "string_array")) return CONFIG_ITEM_STRING_ARRAY;
return -1;
}
static bool
lua_plugin_check_field (lua_State *L, int idx, const char *name,
int expected, bool optional)
{
int found = lua_getfield (L, idx, name);
if (found == expected)
return true;
if (optional && found == LUA_TNIL)
return false;
const char *message = optional
? "invalid field \"%s\" (found: %s, expected: %s or nil)"
: "invalid or missing field \"%s\" (found: %s, expected: %s)";
return luaL_error (L, message, name,
lua_typename (L, found), lua_typename (L, expected));
}
static int
lua_plugin_add_config_schema (lua_State *L, struct lua_plugin *plugin,
struct config_item *subtree, const char *name)
{
struct config_item *item = str_map_find (&subtree->value.object, name);
// This should only ever happen because of a conflict with another plugin;
// this is the price we pay for simplicity
if (item && item->schema)
{
struct lua_schema_item *owner = item->user_data;
return luaL_error (L, "conflicting schema item: %s (owned by: %s)",
name, owner->plugin->super.name);
}
// Create and initialize a full userdata wrapper for the schema item
struct lua_schema_item *self = lua_newuserdata (L, sizeof *self);
luaL_setmetatable (L, XLUA_SCHEMA_METATABLE);
memset (self, 0, sizeof *self);
self->plugin = plugin;
self->ref_on_change = LUA_REFNIL;
self->ref_validate = LUA_REFNIL;
struct config_schema *schema = &self->schema;
schema->name = xstrdup (name);
schema->comment = NULL;
schema->default_ = NULL;
schema->type = CONFIG_ITEM_NULL;
schema->on_change = lua_schema_item_on_change;
schema->validate = lua_schema_item_validate;
// Try to update the defaults with values provided by the plugin
int values = lua_absindex (L, -2);
(void) lua_plugin_check_field (L, values, "type", LUA_TSTRING, false);
int item_type = schema->type =
lua_plugin_decode_config_item_type (lua_tostring (L, -1));
if (item_type == -1)
return luaL_error (L, "invalid type of schema item");
if (lua_plugin_check_field (L, values, "comment", LUA_TSTRING, true))
schema->comment = xstrdup (lua_tostring (L, -1));
if (lua_plugin_check_field (L, values, "default", LUA_TSTRING, true))
schema->default_ = xstrdup (lua_tostring (L, -1));
lua_pop (L, 3);
(void) lua_plugin_check_field (L, values, "on_change", LUA_TFUNCTION, true);
self->ref_on_change = luaL_ref (L, LUA_REGISTRYINDEX);
(void) lua_plugin_check_field (L, values, "validate", LUA_TFUNCTION, true);
self->ref_validate = luaL_ref (L, LUA_REGISTRYINDEX);
// Try to install the created schema item into our configuration
struct error *warning = NULL, *e = NULL;
item = config_schema_initialize_item
(&self->schema, subtree, self, &warning, &e);
if (warning)
{
log_global_error (plugin->ctx, "Lua: plugin \"#s\": #s",
plugin->super.name, warning->message);
error_free (warning);
}
if (e)
{
const char *error = lua_pushstring (L, e->message);
error_free (e);
return luaL_error (L, "%s", error);
}
self->item = item;
LIST_PREPEND (plugin->schemas, self);
// On the stack there should be the schema table and the resulting object;
// we need to make sure Lua doesn't GC the second and get rid of them both
lua_cache_store (L, self, -1);
lua_pop (L, 2);
return 0;
}
static int
lua_plugin_setup_config (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
luaL_checktype (L, 1, LUA_TTABLE);
struct app_context *ctx = plugin->ctx;
char *config_name = plugin_config_name (&plugin->super);
if (!config_name)
return luaL_error (L, "unsuitable plugin name");
struct str_map *plugins = get_plugins_config (ctx);
struct config_item *subtree = str_map_find (plugins, config_name);
if (!subtree || subtree->type != CONFIG_ITEM_OBJECT)
str_map_set (plugins, config_name, (subtree = config_item_object ()));
free (config_name);
LIST_FOR_EACH (struct lua_schema_item, iter, plugin->schemas)
lua_schema_item_discard (iter);
// Load all schema items and apply them to the plugin's subtree
lua_pushnil (L);
while (lua_next (L, 1))
{
if (lua_type (L, -2) != LUA_TSTRING
|| lua_type (L, -1) != LUA_TTABLE)
return luaL_error (L, "%s: %s -> %s", "invalid types",
lua_typename (L, lua_type (L, -2)),
lua_typename (L, lua_type (L, -1)));
lua_plugin_add_config_schema (L, plugin, subtree, lua_tostring (L, -2));
}
// Let the plugin read out configuration via on_change callbacks
config_schema_call_changed (subtree);
return 0;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/// Identifier for the Lua metatable
#define XLUA_CONNECTION_METATABLE "connection"
struct lua_connection
{
struct lua_plugin *plugin; ///< The plugin we belong to
struct poller_fd socket_event; ///< Socket is ready
int socket_fd; ///< Underlying connected socket
bool got_eof; ///< Half-closed by remote host
bool closing; ///< We're closing the connection
struct str read_buffer; ///< Read buffer
struct str write_buffer; ///< Write buffer
};
static void
lua_connection_update_poller (struct lua_connection *self)
{
poller_fd_set (&self->socket_event,
self->write_buffer.len ? (POLLIN | POLLOUT) : POLLIN);
}
static int
lua_connection_send (lua_State *L)
{
struct lua_connection *self =
luaL_checkudata (L, 1, XLUA_CONNECTION_METATABLE);
if (self->socket_fd == -1)
return luaL_error (L, "connection has been closed");
size_t len;
const char *s = luaL_checklstring (L, 2, &len);
str_append_data (&self->write_buffer, s, len);
lua_connection_update_poller (self);
return 0;
}
static void
lua_connection_discard (struct lua_connection *self)
{
if (self->socket_fd != -1)
{
poller_fd_reset (&self->socket_event);
xclose (self->socket_fd);
self->socket_fd = -1;
str_free (&self->read_buffer);
str_free (&self->write_buffer);
}
// Connection is dead, we don't need to hold onto any resources anymore
lua_cache_invalidate (self->plugin->L, self);
}
static int
lua_connection_close (lua_State *L)
{
struct lua_connection *self =
luaL_checkudata (L, 1, XLUA_CONNECTION_METATABLE);
if (self->socket_fd != -1)
{
self->closing = true;
// NOTE: this seems to do nothing on Linux
(void) shutdown (self->socket_fd, SHUT_RD);
// Right now we want to wait until all data is flushed to the socket
// and can't call close() here immediately -- a rewrite to use async
// would enable the user to await on either :send() or :flush();
// a successful send() doesn't necessarily mean anything though
if (!self->write_buffer.len)
lua_connection_discard (self);
}
return 0;
}
static int
lua_connection_gc (lua_State *L)
{
lua_connection_discard (luaL_checkudata (L, 1, XLUA_CONNECTION_METATABLE));
return 0;
}
static luaL_Reg lua_connection_table[] =
{
{ "send", lua_connection_send },
{ "close", lua_connection_close },
{ "__gc", lua_connection_gc },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_connection_check_fn (lua_State *L)
{
lua_plugin_check_field (L, 1, luaL_checkstring (L, 2), LUA_TFUNCTION, true);
return 1;
}
// We need to run it in a protected environment because of lua_getfield()
static bool
lua_connection_cb_lookup (struct lua_connection *self, const char *name,
struct error **e)
{
lua_State *L = self->plugin->L;
lua_pushcfunction (L, lua_connection_check_fn);
hard_assert (lua_cache_get (L, self));
lua_pushstring (L, name);
return lua_plugin_call (self->plugin, 2, 1, e);
}
// Ideally lua_connection_cb_lookup() would return a ternary value
static bool
lua_connection_eat_nil (struct lua_connection *self)
{
if (lua_toboolean (self->plugin->L, -1))
return false;
lua_pop (self->plugin->L, 1);
return true;
}
static bool
lua_connection_invoke_on_data (struct lua_connection *self, struct error **e)
{
if (!lua_connection_cb_lookup (self, "on_data", e))
return false;
if (lua_connection_eat_nil (self))
return true;
lua_pushlstring (self->plugin->L,
self->read_buffer.str, self->read_buffer.len);
return lua_plugin_call (self->plugin, 1, 0, e);
}
static bool
lua_connection_invoke_on_eof (struct lua_connection *self, struct error **e)
{
if (!lua_connection_cb_lookup (self, "on_eof", e))
return false;
if (lua_connection_eat_nil (self))
return true;
return lua_plugin_call (self->plugin, 0, 0, e);
}
static bool
lua_connection_invoke_on_error (struct lua_connection *self,
const char *error, struct error **e)
{
// XXX: not sure if ignoring errors after :close() is always desired;
// code might want to make sure that data are transferred successfully
if (!self->closing
&& lua_connection_cb_lookup (self, "on_error", e)
&& !lua_connection_eat_nil (self))
{
lua_pushstring (self->plugin->L, error);
lua_plugin_call (self->plugin, 1, 0, e);
}
return false;
}
static bool
lua_connection_try_read (struct lua_connection *self, struct error **e)
{
// Avoid the read call when it's obviously not going to return any data
// and would only cause unwanted invocation of callbacks
if (self->closing || self->got_eof)
return true;
enum socket_io_result read_result =
socket_io_try_read (self->socket_fd, &self->read_buffer);
const char *error = strerror (errno);
// Dispatch any data that we got before an EOF or any error
if (self->read_buffer.len)
{
if (!lua_connection_invoke_on_data (self, e))
return false;
str_reset (&self->read_buffer);
}
if (read_result == SOCKET_IO_EOF)
{
if (!lua_connection_invoke_on_eof (self, e))
return false;
self->got_eof = true;
}
if (read_result == SOCKET_IO_ERROR)
return lua_connection_invoke_on_error (self, error, e);
return true;
}
static bool
lua_connection_try_write (struct lua_connection *self, struct error **e)
{
enum socket_io_result write_result =
socket_io_try_write (self->socket_fd, &self->write_buffer);
const char *error = strerror (errno);
if (write_result == SOCKET_IO_ERROR)
return lua_connection_invoke_on_error (self, error, e);
return !self->closing || self->write_buffer.len;
}
static void
lua_connection_on_ready (const struct pollfd *pfd, struct lua_connection *self)
{
(void) pfd;
// Hold a reference so that it doesn't get collected on close()
hard_assert (lua_cache_get (self->plugin->L, self));
struct error *e = NULL;
bool keep = lua_connection_try_read (self, &e)
&& lua_connection_try_write (self, &e);
if (e)
lua_plugin_log_error (self->plugin, "network I/O", e);
if (keep)
lua_connection_update_poller (self);
else
lua_connection_discard (self);
lua_pop (self->plugin->L, 1);
}
static struct lua_connection *
lua_plugin_push_connection (struct lua_plugin *plugin, int socket_fd)
{
lua_State *L = plugin->L;
struct lua_connection *self = lua_newuserdata (L, sizeof *self);
luaL_setmetatable (L, XLUA_CONNECTION_METATABLE);
memset (self, 0, sizeof *self);
self->plugin = plugin;
set_blocking (socket_fd, false);
self->socket_event = poller_fd_make
(&plugin->ctx->poller, (self->socket_fd = socket_fd));
self->socket_event.dispatcher = (poller_fd_fn) lua_connection_on_ready;
self->socket_event.user_data = self;
poller_fd_set (&self->socket_event, POLLIN);
self->read_buffer = str_make ();
self->write_buffer = str_make ();
// Make sure the connection doesn't get garbage collected and return it
lua_cache_store (L, self, -1);
return self;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// The script can create as many wait channels as wanted. They only actually
// do anything once they get yielded to the main lua_resume() call.
/// Identifier for the Lua metatable
#define XLUA_WCHANNEL_METATABLE "wchannel"
struct lua_wait_channel
{
LIST_HEADER (struct lua_wait_channel)
struct lua_task *task; ///< The task we're active in
/// Check if the event is ready and eventually push values to the thread;
/// the channel then may release any resources
bool (*check) (struct lua_wait_channel *self);
/// Release all resources held by the subclass
void (*cleanup) (struct lua_wait_channel *self);
};
static int
lua_wchannel_gc (lua_State *L)
{
struct lua_wait_channel *self =
luaL_checkudata (L, 1, XLUA_WCHANNEL_METATABLE);
if (self->cleanup)
self->cleanup (self);
return 0;
}
static luaL_Reg lua_wchannel_table[] =
{
{ "__gc", lua_wchannel_gc },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// A task encapsulates a thread so that wait channels yielded from its main
// function get waited upon by the event loop
#define XLUA_TASK_METATABLE "task" ///< Identifier for the Lua metatable
struct lua_task
{
LIST_HEADER (struct lua_task)
struct lua_plugin *plugin; ///< The plugin we belong to
lua_State *thread; ///< Lua thread
struct lua_wait_channel *active; ///< Channels we're waiting on
struct poller_idle idle; ///< Idle job
};
static void
lua_task_unregister_channels (struct lua_task *self)
{
LIST_FOR_EACH (struct lua_wait_channel, iter, self->active)
{
iter->task = NULL;
LIST_UNLINK (self->active, iter);
lua_cache_invalidate (self->plugin->L, iter);
}
}
static void
lua_task_cancel_internal (struct lua_task *self)
{
if (self->thread)
{
lua_cache_invalidate (self->plugin->L, self->thread);
self->thread = NULL;
}
lua_task_unregister_channels (self);
poller_idle_reset (&self->idle);
// The task no longer has to stay alive
lua_cache_invalidate (self->plugin->L, self);
}
static int
lua_task_cancel (lua_State *L)
{
struct lua_task *self = luaL_checkudata (L, 1, XLUA_TASK_METATABLE);
// We could also yield and make lua_task_resume() check "self->thread",
// however the main issue here is that the script should just return
luaL_argcheck (L, L != self->thread, 1,
"cannot cancel task from within itself");
lua_task_cancel_internal (self);
return 0;
}
#define lua_task_wakeup(self) poller_idle_set (&(self)->idle)
static bool
lua_task_schedule (struct lua_task *self, int n, struct error **e)
{
lua_State *L = self->thread;
for (int i = -1; -i <= n; i--)
{
struct lua_wait_channel *channel =
luaL_testudata (L, i, XLUA_WCHANNEL_METATABLE);
if (!channel)
return error_set (e, "bad argument #%d to yield: %s", -i + n + 1,
"tasks can only yield wait channels");
if (channel->task)
return error_set (e, "bad argument #%d to yield: %s", -i + n + 1,
"wait channels can only be active in one task at most");
}
for (int i = -1; -i <= n; i--)
{
// Quietly ignore duplicate channels
struct lua_wait_channel *channel = lua_touserdata (L, i);
if (channel->task)
continue;
// By going in reverse the list ends up in the right order
channel->task = self;
LIST_PREPEND (self->active, channel);
lua_cache_store (self->plugin->L, channel, i);
}
lua_pop (L, n);
// There doesn't have to be a single channel
// We can also be waiting on a channel that is already ready
lua_task_wakeup (self);
return true;
}
static void
lua_task_resume (struct lua_task *self, int index)
{
lua_State *L = self->thread;
bool waiting_on_multiple = self->active && self->active->next;
// Since we've ended the wait, we don't need to hold on to them anymore
lua_task_unregister_channels (self);
// On the first run we also have the main function on the stack,
// before any initial arguments
int n = lua_gettop (L) - (lua_status (L) == LUA_OK);
// Pack the values in a table and prepend the index of the channel, so that
// the caller doesn't need to care about the number of return values
if (waiting_on_multiple)
{
lua_plugin_pack (L, n);
lua_pushinteger (L, index);
lua_insert (L, -2);
n = 2;
}
#if LUA_VERSION_NUM >= 504
int nresults = 0;
int res = lua_resume (L, NULL, n, &nresults);
#else
int res = lua_resume (L, NULL, n);
int nresults = lua_gettop (L);
#endif
struct error *error = NULL;
if (res == LUA_YIELD)
{
// AFAIK we don't get any good error context information from here
if (lua_task_schedule (self, nresults, &error))
return;
}
// For simplicity ignore any results from successful returns
else if (res != LUA_OK)
{
luaL_traceback (L, L, lua_tostring (L, -1), 0 /* or 1? */);
lua_plugin_process_error (self->plugin, lua_tostring (L, -1), &error);
lua_pop (L, 2);
}
if (error)
lua_plugin_log_error (self->plugin, "task", error);
lua_task_cancel_internal (self);
}
static void
lua_task_check (struct lua_task *self)
{
poller_idle_reset (&self->idle);
lua_Integer i = 0;
LIST_FOR_EACH (struct lua_wait_channel, iter, self->active)
{
i++;
if (iter->check (iter))
{
lua_task_resume (self, i);
return;
}
}
if (!self->active)
lua_task_resume (self, i);
}
// The task dies either when it finishes, it is cancelled, or at plugin unload
static luaL_Reg lua_task_table[] =
{
{ "cancel", lua_task_cancel },
{ "__gc", lua_task_cancel },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct lua_wait_timer
{
struct lua_wait_channel super; ///< The structure we're deriving
struct poller_timer timer; ///< Timer event
bool expired; ///< Whether the timer has expired
};
static bool
lua_wait_timer_check (struct lua_wait_channel *wchannel)
{
struct lua_wait_timer *self =
CONTAINER_OF (wchannel, struct lua_wait_timer, super);
return self->super.task && self->expired;
}
static void
lua_wait_timer_cleanup (struct lua_wait_channel *wchannel)
{
struct lua_wait_timer *self =
CONTAINER_OF (wchannel, struct lua_wait_timer, super);
poller_timer_reset (&self->timer);
}
static void
lua_wait_timer_dispatch (struct lua_wait_timer *self)
{
self->expired = true;
if (self->super.task)
lua_task_wakeup (self->super.task);
}
static int
lua_plugin_push_wait_timer (struct lua_plugin *plugin, lua_State *L,
lua_Integer timeout)
{
struct lua_wait_timer *self = lua_newuserdata (L, sizeof *self);
luaL_setmetatable (L, XLUA_WCHANNEL_METATABLE);
memset (self, 0, sizeof *self);
self->super.check = lua_wait_timer_check;
self->super.cleanup = lua_wait_timer_cleanup;
self->timer = poller_timer_make (&plugin->ctx->poller);
self->timer.dispatcher = (poller_timer_fn) lua_wait_timer_dispatch;
self->timer.user_data = self;
if (timeout)
poller_timer_set (&self->timer, timeout);
else
self->expired = true;
return 1;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct lua_wait_dial
{
struct lua_wait_channel super; ///< The structure we're deriving
struct lua_plugin *plugin; ///< The plugin we belong to
struct connector connector; ///< Connector object
bool active; ///< Whether the connector is alive
struct lua_connection *connection; ///< Established connection
char *hostname; ///< Target hostname
char *last_error; ///< Connecting error, if any
};
static bool
lua_wait_dial_check (struct lua_wait_channel *wchannel)
{
struct lua_wait_dial *self =
CONTAINER_OF (wchannel, struct lua_wait_dial, super);
lua_State *L = self->super.task->thread;
if (self->connection)
{
// FIXME: this way the connection may leak -- we pass the value to the
// task manager on the stack and forget about it but still leave the
// connection in the cache. That is because right now, when Lua code
// sets up callbacks in the connection object and returns, it might
// get otherwise GC'd since nothing else keeps referencing it.
// By rewriting lua_connection using async, tasks and wait channels
// would hold a reference, allowing us to remove it from the cache.
lua_cache_get (L, self->connection);
lua_pushstring (L, self->hostname);
self->connection = NULL;
}
else if (self->last_error)
{
lua_pushnil (L);
lua_pushnil (L);
lua_pushstring (L, self->last_error);
}
else
return false;
return true;
}
static void
lua_wait_dial_cancel (struct lua_wait_dial *self)
{
if (self->active)
{
connector_free (&self->connector);
self->active = false;
}
}
static void
lua_wait_dial_cleanup (struct lua_wait_channel *wchannel)
{
struct lua_wait_dial *self =
CONTAINER_OF (wchannel, struct lua_wait_dial, super);
lua_wait_dial_cancel (self);
if (self->connection)
lua_connection_discard (self->connection);
free (self->hostname);
free (self->last_error);
}
static void
lua_wait_dial_on_connected (void *user_data, int socket, const char *hostname)
{
struct lua_wait_dial *self = user_data;
if (self->super.task)
lua_task_wakeup (self->super.task);
self->connection = lua_plugin_push_connection (self->plugin, socket);
// TODO: use the hostname for SNI once TLS is implemented
self->hostname = xstrdup (hostname);
lua_wait_dial_cancel (self);
}
static void
lua_wait_dial_on_failure (void *user_data)
{
struct lua_wait_dial *self = user_data;
if (self->super.task)
lua_task_wakeup (self->super.task);
lua_wait_dial_cancel (self);
}
static void
lua_wait_dial_on_error (void *user_data, const char *error)
{
struct lua_wait_dial *self = user_data;
cstr_set (&self->last_error, xstrdup (error));
}
static int
lua_plugin_push_wait_dial (struct lua_plugin *plugin, lua_State *L,
const char *host, const char *service)
{
struct lua_wait_dial *self = lua_newuserdata (L, sizeof *self);
luaL_setmetatable (L, XLUA_WCHANNEL_METATABLE);
memset (self, 0, sizeof *self);
self->super.check = lua_wait_dial_check;
self->super.cleanup = lua_wait_dial_cleanup;
struct connector *connector = &self->connector;
connector_init (connector, &plugin->ctx->poller);
connector_add_target (connector, host, service);
connector->on_connected = lua_wait_dial_on_connected;
connector->on_connecting = NULL;
connector->on_error = lua_wait_dial_on_error;
connector->on_failure = lua_wait_dial_on_failure;
connector->user_data = self;
self->plugin = plugin;
self->active = true;
return 1;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_async_go (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
luaL_checktype (L, 1, LUA_TFUNCTION);
lua_State *thread = lua_newthread (L);
lua_cache_store (L, thread, -1);
lua_pop (L, 1);
// Move the main function w/ arguments to the thread
lua_xmove (L, thread, lua_gettop (L));
struct lua_task *task = lua_newuserdata (L, sizeof *task);
luaL_setmetatable (L, XLUA_TASK_METATABLE);
memset (task, 0, sizeof *task);
task->plugin = plugin;
task->thread = thread;
task->idle = poller_idle_make (&plugin->ctx->poller);
task->idle.dispatcher = (poller_idle_fn) lua_task_check;
task->idle.user_data = task;
poller_idle_set (&task->idle);
// Make sure the task doesn't get garbage collected and return it
lua_cache_store (L, task, -1);
return 1;
}
static int
lua_async_timer_ms (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
lua_Integer timeout = luaL_checkinteger (L, 1);
if (timeout < 0)
luaL_argerror (L, 1, "timeout mustn't be negative");
return lua_plugin_push_wait_timer (plugin, L, timeout);
}
static int
lua_async_dial (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
return lua_plugin_push_wait_dial (plugin, L,
luaL_checkstring (L, 1), luaL_checkstring (L, 2));
}
static luaL_Reg lua_async_library[] =
{
{ "go", lua_async_go },
{ "timer_ms", lua_async_timer_ms },
{ "dial", lua_async_dial },
{ NULL, NULL },
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
lua_plugin_get_screen_size (lua_State *L)
{
lua_pushinteger (L, g_terminal.lines);
lua_pushinteger (L, g_terminal.columns);
return 2;
}
static int
lua_plugin_measure (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
const char *line = lua_plugin_check_utf8 (L, 1);
size_t term_len = 0, processed = 0, width = 0, len;
char *term = iconv_xstrdup (plugin->ctx->term_from_utf8,
(char *) line, strlen (line) + 1, &term_len);
mbstate_t ps;
memset (&ps, 0, sizeof ps);
wchar_t wch;
while ((len = mbrtowc (&wch, term + processed, term_len - processed, &ps)))
{
hard_assert (len != (size_t) -2 && len != (size_t) -1);
hard_assert ((processed += len) <= term_len);
int wch_width = wcwidth (wch);
width += MAX (0, wch_width);
}
free (term);
lua_pushinteger (L, width);
return 1;
}
static int
lua_ctx_gc (lua_State *L)
{
return lua_weak_gc (L, &lua_ctx_info);
}
static luaL_Reg lua_plugin_library[] =
{
// These are pseudo-global functions:
{ "measure", lua_plugin_measure },
{ "parse", lua_plugin_parse },
{ "hook_input", lua_plugin_hook_input },
{ "hook_irc", lua_plugin_hook_irc },
{ "hook_prompt", lua_plugin_hook_prompt },
{ "hook_completion", lua_plugin_hook_completion },
{ "setup_config", lua_plugin_setup_config },
// And these are methods:
// Note that this only returns the height when used through an accessor.
{ "get_screen_size", lua_plugin_get_screen_size },
{ "__gc", lua_ctx_gc },
{ NULL, NULL },
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void *
lua_plugin_alloc (void *ud, void *ptr, size_t o_size, size_t n_size)
{
(void) ud;
(void) o_size;
if (n_size)
return realloc (ptr, n_size);
free (ptr);
return NULL;
}
static int
lua_plugin_panic (lua_State *L)
{
// XXX: we might be able to do something better
print_fatal ("Lua panicked: %s", lua_tostring (L, -1));
lua_close (L);
exit (EXIT_FAILURE);
return 0;
}
static void
lua_plugin_push_ref (lua_State *L, struct lua_plugin *self, void *object,
struct ispect_field *field)
{
// We create a mapping on object type registration
hard_assert (lua_rawgetp (L, LUA_REGISTRYINDEX, field->fields));
struct lua_weak_info *info = lua_touserdata (L, -1);
lua_pop (L, 1);
if (!field->is_list)
{
lua_weak_push (L, self, object, info);
return;
}
// As a rule in this codebase, these fields are right at the top of structs
struct list_header { LIST_HEADER (void) };
int i = 1;
lua_newtable (L);
LIST_FOR_EACH (struct list_header, iter, object)
{
lua_weak_push (L, self, iter, info);
lua_rawseti (L, -2, i++);
}
}
static void lua_plugin_push_map_field (lua_State *L, struct lua_plugin *self,
const char *key, void *p, struct ispect_field *field);
static void
lua_plugin_push_struct (lua_State *L, struct lua_plugin *self,
enum ispect_type type, void *value, struct ispect_field *field)
{
if (type == ISPECT_STR)
{
const struct str *s = value;
lua_pushlstring (L, s->str, s->len);
return;
}
if (type == ISPECT_STR_MAP)
{
struct str_map_iter iter = str_map_iter_make (value);
void *value;
lua_newtable (L);
while ((value = str_map_iter_next (&iter)))
lua_plugin_push_map_field (L, self, iter.link->key, value, field);
return;
}
hard_assert (!"unhandled introspection object type");
}
static void
lua_plugin_push_map_field (lua_State *L, struct lua_plugin *self,
const char *key, void *p, struct ispect_field *field)
{
// That would mean maps in maps ad infinitum
hard_assert (field->subtype != ISPECT_STR_MAP);
intptr_t n = (intptr_t) p;
switch (field->subtype)
{
// Here the types are generally casted to a void pointer
case ISPECT_BOOL: lua_pushboolean (L, (bool ) n); break;
case ISPECT_INT: lua_pushinteger (L, (int ) n); break;
case ISPECT_UINT: lua_pushinteger (L, (unsigned ) n); break;
case ISPECT_SIZE: lua_pushinteger (L, (size_t ) n); break;
case ISPECT_STRING: lua_pushstring (L, p); break;
case ISPECT_REF: lua_plugin_push_ref (L, self, p, field); break;
default: lua_plugin_push_struct (L, self, field->subtype, p, field);
}
lua_setfield (L, -2, key);
}
static bool
lua_plugin_property_get_ispect (lua_State *L, const char *property_name)
{
struct lua_weak_info *info = lua_touserdata (L, lua_upvalueindex (1));
if (!info || !info->ispect)
return false;
struct lua_weak *weak = luaL_checkudata (L, 1, info->name);
// TODO: I think we can do better than this, maybe binary search at least?
struct ispect_field *field;
for (field = info->ispect; field->name; field++)
if (!strcmp (property_name, field->name))
break;
if (!field->name)
return false;
struct lua_plugin *self = weak->plugin;
void *p = (uint8_t *) weak->object + field->offset;
switch (field->type)
{
// Here the types are really what's under the pointer
case ISPECT_BOOL: lua_pushboolean (L, *(bool *) p); break;
case ISPECT_INT: lua_pushinteger (L, *(int *) p); break;
case ISPECT_UINT: lua_pushinteger (L, *(unsigned *) p); break;
case ISPECT_SIZE: lua_pushinteger (L, *(size_t *) p); break;
case ISPECT_STRING: lua_pushstring (L, *(char **) p); break;
case ISPECT_REF: lua_plugin_push_ref (L, self, *(void **) p, field); break;
default: lua_plugin_push_struct (L, self, field->type, p, field);
}
return true;
}
static int
lua_plugin_property_get (lua_State *L)
{
luaL_checktype (L, 1, LUA_TUSERDATA);
const char *property_name = luaL_checkstring (L, 2);
// Either it's directly present in the metatable
if (luaL_getmetafield (L, 1, property_name))
return 1;
// Or we try to find and eventually call a getter method
char *getter_name = xstrdup_printf ("get_%s", property_name);
bool found = luaL_getmetafield (L, 1, getter_name);
free (getter_name);
if (found)
{
lua_pushvalue (L, 1);
lua_call (L, 1, 1);
return 1;
}
// Maybe we can find it via introspection
if (lua_plugin_property_get_ispect (L, property_name))
return 1;
// Or we look for a property set by the user (__gc cannot be overriden)
if (lua_getuservalue (L, 1) != LUA_TTABLE)
lua_pushnil (L);
else
lua_getfield (L, -1, property_name);
return 1;
}
static int
lua_plugin_property_set (lua_State *L)
{
luaL_checktype (L, 1, LUA_TUSERDATA);
const char *property_name = luaL_checkstring (L, 2);
luaL_checkany (L, 3);
// We use the associated value to store user-defined properties
int type = lua_getuservalue (L, 1);
if (type == LUA_TNIL)
{
lua_pop (L, 1);
lua_newtable (L);
lua_pushvalue (L, -1);
lua_setuservalue (L, 1);
}
else if (type != LUA_TTABLE)
return luaL_error (L, "associated value is not a table");
// Beware that we do not check for conflicts here;
// if Lua code writes a conflicting field, it is effectively ignored
lua_pushvalue (L, 3);
lua_setfield (L, -2, property_name);
return 0;
}
static void
lua_plugin_add_accessors (lua_State *L, struct lua_weak_info *info)
{
// Emulate properties for convenience
lua_pushlightuserdata (L, info);
lua_pushcclosure (L, lua_plugin_property_get, 1);
lua_setfield (L, -2, "__index");
lua_pushcfunction (L, lua_plugin_property_set);
lua_setfield (L, -2, "__newindex");
}
static void
lua_plugin_reg_meta (lua_State *L, const char *name, luaL_Reg *fns)
{
luaL_newmetatable (L, name);
luaL_setfuncs (L, fns, 0);
lua_plugin_add_accessors (L, NULL);
lua_pop (L, 1);
}
static void
lua_plugin_reg_weak (lua_State *L, struct lua_weak_info *info, luaL_Reg *fns)
{
// Create a mapping from the object type (info->ispect) back to metadata
// so that we can figure out what to create from ISPECT_REF fields
lua_pushlightuserdata (L, info);
lua_rawsetp (L, LUA_REGISTRYINDEX, info->ispect);
luaL_newmetatable (L, info->name);
luaL_setfuncs (L, fns, 0);
lua_plugin_add_accessors (L, info);
lua_pop (L, 1);
}
static struct plugin *
lua_plugin_load (struct app_context *ctx, const char *filename,
struct error **e)
{
lua_State *L = lua_newstate (lua_plugin_alloc, NULL);
if (!L)
{
error_set (e, "Lua initialization failed");
return NULL;
}
lua_atpanic (L, lua_plugin_panic);
luaL_openlibs (L);
struct lua_plugin *plugin = xcalloc (1, sizeof *plugin);
plugin->super.name = xstrdup (filename);
plugin->super.vtable = &lua_plugin_vtable;
plugin->ctx = ctx;
plugin->L = L;
luaL_checkversion (L);
// Register the xC library as a singleton with "plugin" as an upvalue
// (mostly historical, but rather convenient)
luaL_newmetatable (L, lua_ctx_info.name);
lua_pushlightuserdata (L, plugin);
luaL_setfuncs (L, lua_plugin_library, 1);
lua_plugin_add_accessors (L, &lua_ctx_info);
// Add the asynchronous library underneath
lua_newtable (L);
lua_pushlightuserdata (L, plugin);
luaL_setfuncs (L, lua_async_library, 1);
lua_setfield (L, -2, "async");
lua_pop (L, 1);
lua_weak_push (L, plugin, ctx, &lua_ctx_info);
lua_setglobal (L, lua_ctx_info.name);
// Create metatables for our objects
lua_plugin_reg_meta (L, XLUA_HOOK_METATABLE, lua_hook_table);
lua_plugin_reg_weak (L, &lua_user_info, lua_user_table);
lua_plugin_reg_weak (L, &lua_channel_info, lua_channel_table);
lua_plugin_reg_weak (L, &lua_buffer_info, lua_buffer_table);
lua_plugin_reg_weak (L, &lua_server_info, lua_server_table);
lua_plugin_reg_meta (L, XLUA_SCHEMA_METATABLE, lua_schema_table);
lua_plugin_reg_meta (L, XLUA_CONNECTION_METATABLE, lua_connection_table);
lua_plugin_reg_meta (L, XLUA_TASK_METATABLE, lua_task_table);
lua_plugin_reg_meta (L, XLUA_WCHANNEL_METATABLE, lua_wchannel_table);
struct error *error = NULL;
if (luaL_loadfile (L, filename))
error_set (e, "%s: %s", "Lua", lua_tostring (L, -1));
else if (!lua_plugin_call (plugin, 0, 0, &error))
{
error_set (e, "%s: %s", "Lua", error->message);
error_free (error);
}
else
return &plugin->super;
plugin_destroy (&plugin->super);
return NULL;
}
#endif // HAVE_LUA
// --- Plugins -----------------------------------------------------------------
typedef struct plugin *(*plugin_load_fn)
(struct app_context *ctx, const char *filename, struct error **e);
// We can potentially add support for other scripting languages if so desired,
// however this possibility is just a byproduct of abstraction
static plugin_load_fn g_plugin_loaders[] =
{
#ifdef HAVE_LUA
lua_plugin_load,
#endif // HAVE_LUA
};
static struct plugin *
plugin_load_from_filename (struct app_context *ctx, const char *filename,
struct error **e)
{
struct plugin *plugin = NULL;
struct error *error = NULL;
for (size_t i = 0; i < N_ELEMENTS (g_plugin_loaders); i++)
if ((plugin = g_plugin_loaders[i](ctx, filename, &error)) || error)
break;
if (error)
error_propagate (e, error);
else if (!plugin)
{
error_set (e, "no plugin handler for \"%s\"", filename);
return NULL;
}
return plugin;
}
static struct plugin *
plugin_find (struct app_context *ctx, const char *name)
{
LIST_FOR_EACH (struct plugin, iter, ctx->plugins)
if (!strcmp (name, iter->name))
return iter;
return NULL;
}
static char *
plugin_resolve_relative_filename (const char *filename)
{
struct strv paths = strv_make ();
get_xdg_data_dirs (&paths);
char *result = resolve_relative_filename_generic
(&paths, PROGRAM_NAME "/plugins/", filename);
strv_free (&paths);
return result;
}
static struct plugin *
plugin_load_by_name (struct app_context *ctx, const char *name,
struct error **e)
{
struct plugin *plugin = plugin_find (ctx, name);
if (plugin)
{
error_set (e, "plugin already loaded");
return NULL;
}
// As a side effect, a plugin can be loaded multiple times by giving
// various relative or non-relative paths to the function; this is not
// supposed to be fool-proof though, that requires other mechanisms
char *filename = resolve_filename (name, plugin_resolve_relative_filename);
if (!filename)
{
error_set (e, "file not found");
return NULL;
}
plugin = plugin_load_from_filename (ctx, filename, e);
free (filename);
return plugin;
}
static void
plugin_load (struct app_context *ctx, const char *name)
{
struct error *e = NULL;
struct plugin *plugin = plugin_load_by_name (ctx, name, &e);
if (plugin)
{
// FIXME: this way the real name isn't available to the plugin on load,
// which has effect on e.g. plugin_config_name()
cstr_set (&plugin->name, xstrdup (name));
log_global_status (ctx, "Plugin \"#s\" loaded", name);
LIST_PREPEND (ctx->plugins, plugin);
}
else
{
log_global_error (ctx, "Can't load plugin \"#s\": #s",
name, e->message);
error_free (e);
}
}
static void
plugin_unload (struct app_context *ctx, const char *name)
{
struct plugin *plugin = plugin_find (ctx, name);
if (!plugin)
log_global_error (ctx, "Can't unload plugin \"#s\": #s",
name, "plugin not loaded");
else
{
log_global_status (ctx, "Plugin \"#s\" unloaded", name);
LIST_UNLINK (ctx->plugins, plugin);
plugin_destroy (plugin);
}
}
static void
load_plugins (struct app_context *ctx)
{
const char *plugins =
get_config_string (ctx->config.root, "general.plugin_autoload");
if (plugins)
{
struct strv v = strv_make ();
cstr_split (plugins, ",", true, &v);
for (size_t i = 0; i < v.len; i++)
plugin_load (ctx, v.vector[i]);
strv_free (&v);
}
}
// --- User input handling -----------------------------------------------------
// HANDLER_NEEDS_REG is primarily for message sending commands,
// as they may want to log buffer lines and use our current nickname
enum handler_flags
{
HANDLER_SERVER = (1 << 0), ///< Server context required
HANDLER_NEEDS_REG = (1 << 1), ///< Server registration required
HANDLER_CHANNEL_FIRST = (1 << 2), ///< Channel required, first argument
HANDLER_CHANNEL_LAST = (1 << 3) ///< Channel required, last argument
};
struct handler_args
{
struct app_context *ctx; ///< Application context
struct buffer *buffer; ///< Current buffer
struct server *s; ///< Related server
const char *channel_name; ///< Related channel name
char *arguments; ///< Command arguments
};
/// Cuts the longest non-whitespace portion of text and advances the pointer
static char *
cut_word (char **s)
{
char *start = *s;
size_t word_len = strcspn (*s, WORD_BREAKING_CHARS);
char *end = start + word_len;
*s = end + strspn (end, WORD_BREAKING_CHARS);
*end = '\0';
return start;
}
/// Validates a word to be cut from a string
typedef bool (*word_validator_fn) (void *, char *);
static char *
maybe_cut_word (char **s, word_validator_fn validator, void *user_data)
{
char *start = *s;
size_t word_len = strcspn (*s, WORD_BREAKING_CHARS);
char *word = xstrndup (start, word_len);
bool ok = validator (user_data, word);
free (word);
if (!ok)
return NULL;
char *end = start + word_len;
*s = end + strspn (end, WORD_BREAKING_CHARS);
*end = '\0';
return start;
}
static char *
maybe_cut_word_from_end (char **s, word_validator_fn validator, void *user_data)
{
// Find the start and end of the last word
// Contrary to maybe_cut_word(), we ignore all whitespace at the end
char *start = *s, *end = start + strlen (start);
while (end > start && strchr (WORD_BREAKING_CHARS, end [-1]))
end--;
char *word = end;
while (word > start && !strchr (WORD_BREAKING_CHARS, word[-1]))
word--;
// There's just one word at maximum, starting at the beginning
if (word == start)
return maybe_cut_word (s, validator, user_data);
char *tmp = xstrndup (word, word - start);
bool ok = validator (user_data, tmp);
free (tmp);
if (!ok)
return NULL;
// It doesn't start at the beginning, cut it off and return it
word[-1] = *end = '\0';
return word;
}
static bool
validate_channel_name (void *user_data, char *word)
{
return irc_is_channel (user_data, word);
}
static char *
try_get_channel (struct handler_args *a,
char *(*cutter) (char **, word_validator_fn, void *))
{
char *channel_name = cutter (&a->arguments, validate_channel_name, a->s);
if (channel_name)
return channel_name;
if (a->buffer->type == BUFFER_CHANNEL)
return a->buffer->channel->name;
return NULL;
}
static bool
try_handle_buffer_goto (struct app_context *ctx, const char *word)
{
unsigned long n;
if (!xstrtoul (&n, word, 10))
return false;
if (n > INT_MAX || !buffer_goto (ctx, n))
log_global_error (ctx, "#s: #s", "No such buffer", word);
return true;
}
static struct buffer *
try_decode_buffer (struct app_context *ctx, const char *word)
{
unsigned long n;
struct buffer *buffer = NULL;
if (xstrtoul (&n, word, 10) && n <= INT_MAX)
buffer = buffer_at_index (ctx, n);
if (buffer || (buffer = buffer_by_name (ctx, word)))
return buffer;
// Basic case insensitive partial matching -- at most one buffer can match
int n_matches = 0;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
{
char *string = xstrdup (iter->name);
char *pattern = xstrdup_printf ("*%s*", word);
for (char *p = string; *p; p++) *p = tolower_ascii (*p);
for (char *p = pattern; *p; p++) *p = tolower_ascii (*p);
if (!fnmatch (pattern, string, 0))
{
n_matches++;
buffer = iter;
}
free (string);
free (pattern);
}
return n_matches == 1 ? buffer : NULL;
}
static void
show_buffers_list (struct app_context *ctx)
{
log_global_indent (ctx, "");
log_global_indent (ctx, "Buffers list:");
int i = 1;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
{
struct str s = str_make ();
int new = iter->new_messages_count - iter->new_unimportant_count;
if (new && iter != ctx->current_buffer)
str_append_printf (&s, " (%d%s)", new, &"!"[!iter->highlighted]);
log_global_indent (ctx,
" [#d] #s#&s", i++, iter->name, str_steal (&s));
}
}
static void
part_channel (struct server *s, const char *channel_name, const char *reason)
{
if (*reason)
irc_send (s, "PART %s :%s", channel_name, reason);
else
irc_send (s, "PART %s", channel_name);
struct channel *channel;
if ((channel = str_map_find (&s->irc_channels, channel_name)))
channel->left_manually = true;
}
static bool
handle_buffer_goto (struct app_context *ctx, struct handler_args *a)
{
if (!*a->arguments)
return false;
const char *which = cut_word (&a->arguments);
struct buffer *buffer = try_decode_buffer (ctx, which);
if (buffer)
buffer_activate (ctx, buffer);
else
log_global_error (ctx, "#s: #s", "No such buffer", which);
return true;
}
static void
handle_buffer_close (struct app_context *ctx, struct handler_args *a)
{
struct buffer *buffer = NULL;
const char *which = NULL;
if (!*a->arguments)
buffer = a->buffer;
else
buffer = try_decode_buffer (ctx, (which = cut_word (&a->arguments)));
if (!buffer)
log_global_error (ctx, "#s: #s", "No such buffer", which);
else if (buffer == ctx->global_buffer)
log_global_error (ctx, "Can't close the global buffer");
else if (buffer->type == BUFFER_SERVER)
log_global_error (ctx, "Can't close a server buffer");
else
{
// The user would be unable to recreate the buffer otherwise
if (buffer->type == BUFFER_CHANNEL
&& irc_channel_is_joined (buffer->channel))
part_channel (buffer->server, buffer->channel->name, "");
buffer_remove_safe (ctx, buffer);
}
}
static bool
handle_buffer_move (struct app_context *ctx, struct handler_args *a)
{
unsigned long request;
if (!xstrtoul (&request, a->arguments, 10))
return false;
if (request == 0 || request > (unsigned long) buffer_count (ctx))
{
log_global_error (ctx, "#s: #s",
"Can't move buffer", "requested position is out of range");
return true;
}
buffer_move (ctx, a->buffer, request);
return true;
}
static bool
handle_command_buffer (struct handler_args *a)
{
struct app_context *ctx = a->ctx;
char *action = cut_word (&a->arguments);
if (try_handle_buffer_goto (ctx, action))
return true;
bool result = true;
if (!*action || !strcasecmp_ascii (action, "list"))
show_buffers_list (ctx);
else if (!strcasecmp_ascii (action, "clear"))
{
buffer_clear (ctx, a->buffer);
if (a->buffer == ctx->current_buffer)
buffer_print_backlog (ctx, a->buffer);
}
else if (!strcasecmp_ascii (action, "move"))
result = handle_buffer_move (ctx, a);
else if (!strcasecmp_ascii (action, "goto"))
result = handle_buffer_goto (ctx, a);
else if (!strcasecmp_ascii (action, "close"))
handle_buffer_close (ctx, a);
else
result = false;
return result;
}
static bool
handle_command_set_add
(struct strv *items, const struct strv *values, struct error **e)
{
for (size_t i = 0; i < values->len; i++)
{
const char *value = values->vector[i];
if (strv_find (items, values->vector[i]) != -1)
return error_set (e, "already present in the array: %s", value);
strv_append (items, value);
}
return true;
}
static bool
handle_command_set_remove
(struct strv *items, const struct strv *values, struct error **e)
{
for (size_t i = 0; i < values->len; i++)
{
const char *value = values->vector[i];
ssize_t i = strv_find (items, value);
if (i == -1)
return error_set (e, "not present in the array: %s", value);
strv_remove (items, i);
}
return true;
}
static bool
handle_command_set_modify
(struct config_item *item, const char *value, bool add, struct error **e)
{
struct strv items = strv_make ();
if (item->type != CONFIG_ITEM_NULL)
cstr_split (item->value.string.str, ",", false, &items);
if (items.len == 1 && !*items.vector[0])
strv_reset (&items);
struct strv values = strv_make ();
cstr_split (value, ",", false, &values);
bool result = add
? handle_command_set_add (&items, &values, e)
: handle_command_set_remove (&items, &values, e);
if (result)
{
char *changed = strv_join (&items, ",");
struct str tmp = { .str = changed, .len = strlen (changed) };
result = config_item_set_from (item,
config_item_string_array (&tmp), e);
free (changed);
}
strv_free (&items);
strv_free (&values);
return result;
}
static bool
handle_command_set_assign_item (struct app_context *ctx,
char *key, struct config_item *new_, bool add, bool remove)
{
struct config_item *item =
config_item_get (ctx->config.root, key, NULL);
hard_assert (item);
struct error *e = NULL;
if (!item->schema)
error_set (&e, "option not recognized");
else if (!add && !remove)
config_item_set_from (item, config_item_clone (new_), &e);
else if (item->schema->type != CONFIG_ITEM_STRING_ARRAY)
error_set (&e, "not a string array");
else
handle_command_set_modify (item, new_->value.string.str, add, &e);
if (e)
{
log_global_error (ctx,
"Failed to set option \"#s\": #s", key, e->message);
error_free (e);
return false;
}
struct strv tmp = strv_make ();
dump_matching_options (ctx->config.root, key, &tmp);
log_global_status (ctx, "Option changed: #s", tmp.vector[0]);
strv_free (&tmp);
return true;
}
static bool
handle_command_set_assign
(struct app_context *ctx, struct strv *all, char *arguments)
{
hard_assert (all->len > 0);
char *op = cut_word (&arguments);
bool add = false;
bool remove = false;
if (!strcmp (op, "+=")) add = true;
else if (!strcmp (op, "-=")) remove = true;
else if (strcmp (op, "=")) return false;
if (!*arguments)
return false;
struct error *e = NULL;
struct config_item *new_ =
config_item_parse (arguments, strlen (arguments), true, &e);
if (e)
{
log_global_error (ctx, "Invalid value: #s", e->message);
error_free (e);
return true;
}
if ((add | remove) && !config_item_type_is_string (new_->type))
{
log_global_error (ctx, "+= / -= operators need a string argument");
config_item_destroy (new_);
return true;
}
bool changed = false;
for (size_t i = 0; i < all->len; i++)
{
char *key = cstr_cut_until (all->vector[i], " ");
if (handle_command_set_assign_item (ctx, key, new_, add, remove))
changed = true;
free (key);
}
config_item_destroy (new_);
if (changed && get_config_boolean (ctx->config.root, "general.autosave"))
save_configuration (ctx);
return true;
}
static bool
handle_command_set (struct handler_args *a)
{
struct app_context *ctx = a->ctx;
char *option = "*";
if (*a->arguments)
option = cut_word (&a->arguments);
struct strv all = strv_make ();
dump_matching_options (ctx->config.root, option, &all);
bool result = true;
if (!all.len)
log_global_error (ctx, "No matches: #s", option);
else if (!*a->arguments)
{
log_global_indent (ctx, "");
for (size_t i = 0; i < all.len; i++)
log_global_indent (ctx, "#s", all.vector[i]);
}
else
result = handle_command_set_assign (ctx, &all, a->arguments);
strv_free (&all);
return result;
}
static bool
handle_command_save (struct handler_args *a)
{
if (*a->arguments)
return false;
save_configuration (a->ctx);
return true;
}
static void
show_plugin_list (struct app_context *ctx)
{
log_global_indent (ctx, "");
log_global_indent (ctx, "Plugins:");
LIST_FOR_EACH (struct plugin, iter, ctx->plugins)
log_global_indent (ctx, " #s", iter->name);
}
static bool
handle_command_plugin (struct handler_args *a)
{
char *action = cut_word (&a->arguments);
if (!*action || !strcasecmp_ascii (action, "list"))
show_plugin_list (a->ctx);
else if (!strcasecmp_ascii (action, "load"))
{
if (!*a->arguments)
return false;
plugin_load (a->ctx, cut_word (&a->arguments));
}
else if (!strcasecmp_ascii (action, "unload"))
{
if (!*a->arguments)
return false;
plugin_unload (a->ctx, cut_word (&a->arguments));
}
else
return false;
return true;
}
static bool
handle_command_relay (struct handler_args *a)
{
if (*a->arguments)
return false;
int len = 0;
LIST_FOR_EACH (struct client, c, a->ctx->clients)
len++;
if (a->ctx->relay_fd == -1)
log_global_status (a->ctx, "The relay is not enabled");
else
log_global_status (a->ctx, "The relay has #d clients", len);
return true;
}
static bool
show_aliases_list (struct app_context *ctx)
{
log_global_indent (ctx, "");
log_global_indent (ctx, "Aliases:");
struct str_map *aliases = get_aliases_config (ctx);
if (!aliases->len)
{
log_global_indent (ctx, " (none)");
return true;
}
struct str_map_iter iter = str_map_iter_make (aliases);
struct config_item *alias;
while ((alias = str_map_iter_next (&iter)))
{
struct str definition = str_make ();
if (config_item_type_is_string (alias->type))
config_item_write_string (&definition, &alias->value.string);
else
str_append (&definition, "alias definition is not a string");
log_global_indent (ctx, " /#s: #s", iter.link->key, definition.str);
str_free (&definition);
}
return true;
}
static bool
handle_command_alias (struct handler_args *a)
{
if (!*a->arguments)
return show_aliases_list (a->ctx);
char *name = cut_word (&a->arguments);
if (!*a->arguments)
return false;
if (*name == '/')
name++;
struct config_item *alias = config_item_string_from_cstr (a->arguments);
struct str definition = str_make ();
config_item_write_string (&definition, &alias->value.string);
str_map_set (get_aliases_config (a->ctx), name, alias);
log_global_status (a->ctx, "Created alias /#s: #s", name, definition.str);
str_free (&definition);
return true;
}
static bool
handle_command_unalias (struct handler_args *a)
{
if (!*a->arguments)
return false;
struct str_map *aliases = get_aliases_config (a->ctx);
while (*a->arguments)
{
char *name = cut_word (&a->arguments);
if (!str_map_find (aliases, name))
log_global_error (a->ctx, "No such alias: #s", name);
else
{
str_map_set (aliases, name, NULL);
log_global_status (a->ctx, "Alias removed: #s", name);
}
}
return true;
}
static bool
handle_command_msg (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (!*a->arguments)
log_server_error (a->s, a->s->buffer, "No text to send");
else
SEND_AUTOSPLIT_PRIVMSG (a->s, target, a->arguments);
return true;
}
static bool
handle_command_query (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (irc_is_channel (a->s, irc_skip_statusmsg (a->s, target)))
log_server_error (a->s, a->s->buffer, "Cannot query a channel");
else if (!*a->arguments)
buffer_activate (a->ctx, irc_get_or_make_user_buffer (a->s, target));
else
{
buffer_activate (a->ctx, irc_get_or_make_user_buffer (a->s, target));
SEND_AUTOSPLIT_PRIVMSG (a->s, target, a->arguments);
}
return true;
}
static bool
handle_command_notice (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (!*a->arguments)
log_server_error (a->s, a->s->buffer, "No text to send");
else
SEND_AUTOSPLIT_NOTICE (a->s, target, a->arguments);
return true;
}
static bool
handle_command_squery (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (!*a->arguments)
log_server_error (a->s, a->s->buffer, "No text to send");
else
irc_send (a->s, "SQUERY %s :%s", target, a->arguments);
return true;
}
static bool
handle_command_ctcp (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (!*a->arguments)
return false;
char *tag = cut_word (&a->arguments);
cstr_transform (tag, toupper_ascii);
if (*a->arguments)
irc_send (a->s, "PRIVMSG %s :\x01%s %s\x01", target, tag, a->arguments);
else
irc_send (a->s, "PRIVMSG %s :\x01%s\x01", target, tag);
return true;
}
static bool
handle_command_me (struct handler_args *a)
{
if (a->buffer->type == BUFFER_CHANNEL)
SEND_AUTOSPLIT_ACTION (a->s,
a->buffer->channel->name, a->arguments);
else if (a->buffer->type == BUFFER_PM)
SEND_AUTOSPLIT_ACTION (a->s,
a->buffer->user->nickname, a->arguments);
else
log_server_error (a->s, a->s->buffer,
"Can't do this from a server buffer (#s)",
"send CTCP actions");
return true;
}
static bool
handle_command_quit (struct handler_args *a)
{
request_quit (a->ctx, *a->arguments ? a->arguments : NULL);
return true;
}
static bool
handle_command_join (struct handler_args *a)
{
// XXX: send the last known channel key?
if (irc_is_channel (a->s, a->arguments))
// XXX: we may want to split the list of channels
irc_send (a->s, "JOIN %s", a->arguments);
else if (a->buffer->type != BUFFER_CHANNEL)
log_server_error (a->s, a->buffer, "#s: #s", "Can't join",
"no channel name given and this buffer is not a channel");
else if (irc_channel_is_joined (a->buffer->channel))
log_server_error (a->s, a->buffer, "#s: #s", "Can't join",
"you already are on the channel");
else if (*a->arguments)
irc_send (a->s, "JOIN %s :%s", a->buffer->channel->name, a->arguments);
else
irc_send (a->s, "JOIN %s", a->buffer->channel->name);
return true;
}
static bool
handle_command_part (struct handler_args *a)
{
if (irc_is_channel (a->s, a->arguments))
{
struct strv v = strv_make ();
cstr_split (cut_word (&a->arguments), ",", true, &v);
for (size_t i = 0; i < v.len; i++)
part_channel (a->s, v.vector[i], a->arguments);
strv_free (&v);
}
else if (a->buffer->type != BUFFER_CHANNEL)
log_server_error (a->s, a->buffer, "#s: #s", "Can't part",
"no channel name given and this buffer is not a channel");
else if (!irc_channel_is_joined (a->buffer->channel))
log_server_error (a->s, a->buffer, "#s: #s", "Can't part",
"you're not on the channel");
else
part_channel (a->s, a->buffer->channel->name, a->arguments);
return true;
}
static void
cycle_channel (struct server *s, const char *channel_name, const char *reason)
{
// If a channel key is set, we must specify it when rejoining
const char *key = NULL;
struct channel *channel;
if ((channel = str_map_find (&s->irc_channels, channel_name)))
key = str_map_find (&channel->param_modes, "k");
if (*reason)
irc_send (s, "PART %s :%s", channel_name, reason);
else
irc_send (s, "PART %s", channel_name);
if (key)
irc_send (s, "JOIN %s :%s", channel_name, key);
else
irc_send (s, "JOIN %s", channel_name);
}
static bool
handle_command_cycle (struct handler_args *a)
{
if (irc_is_channel (a->s, a->arguments))
{
struct strv v = strv_make ();
cstr_split (cut_word (&a->arguments), ",", true, &v);
for (size_t i = 0; i < v.len; i++)
cycle_channel (a->s, v.vector[i], a->arguments);
strv_free (&v);
}
else if (a->buffer->type != BUFFER_CHANNEL)
log_server_error (a->s, a->buffer, "#s: #s", "Can't cycle",
"no channel name given and this buffer is not a channel");
else if (!irc_channel_is_joined (a->buffer->channel))
log_server_error (a->s, a->buffer, "#s: #s", "Can't cycle",
"you're not on the channel");
else
cycle_channel (a->s, a->buffer->channel->name, a->arguments);
return true;
}
static bool
handle_command_mode (struct handler_args *a)
{
// Channel names prefixed by "+" collide with mode strings,
// so we just disallow specifying these channels
char *target = NULL;
if (strchr ("+-\0", *a->arguments))
{
if (a->buffer->type == BUFFER_CHANNEL)
target = a->buffer->channel->name;
if (a->buffer->type == BUFFER_PM)
target = a->buffer->user->nickname;
if (a->buffer->type == BUFFER_SERVER)
target = a->s->irc_user->nickname;
}
else
// If there a->arguments and they don't begin with a mode string,
// they're either a user name or a channel name
target = cut_word (&a->arguments);
if (!target)
log_server_error (a->s, a->buffer, "#s: #s", "Can't change mode",
"no target given and this buffer is neither a PM nor a channel");
else if (*a->arguments)
// XXX: split channel mode params as necessary using irc_max_modes?
irc_send (a->s, "MODE %s %s", target, a->arguments);
else
irc_send (a->s, "MODE %s", target);
return true;
}
static bool
handle_command_topic (struct handler_args *a)
{
if (*a->arguments)
// FIXME: there's no way to start the topic with whitespace
// FIXME: there's no way to unset the topic;
// we could adopt the Tcl style of "-switches" with "--" sentinels,
// or we could accept "strings" in the config format
irc_send (a->s, "TOPIC %s :%s", a->channel_name, a->arguments);
else
irc_send (a->s, "TOPIC %s", a->channel_name);
return true;
}
static bool
handle_command_kick (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (*a->arguments)
irc_send (a->s, "KICK %s %s :%s",
a->channel_name, target, a->arguments);
else
irc_send (a->s, "KICK %s %s", a->channel_name, target);
return true;
}
static bool
handle_command_kickban (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (strpbrk (target, "!@*?"))
return false;
// XXX: how about other masks?
irc_send (a->s, "MODE %s +b %s!*@*", a->channel_name, target);
if (*a->arguments)
irc_send (a->s, "KICK %s %s :%s",
a->channel_name, target, a->arguments);
else
irc_send (a->s, "KICK %s %s", a->channel_name, target);
return true;
}
static void
mass_channel_mode (struct server *s, const char *channel_name,
bool adding, char mode_char, struct strv *v)
{
size_t n;
for (size_t i = 0; i < v->len; i += n)
{
struct str modes = str_make ();
struct str params = str_make ();
n = MIN (v->len - i, s->irc_max_modes);
str_append_printf (&modes, "MODE %s %c", channel_name, "-+"[adding]);
for (size_t k = 0; k < n; k++)
{
str_append_c (&modes, mode_char);
str_append_printf (&params, " %s", v->vector[i + k]);
}
irc_send (s, "%s%s", modes.str, params.str);
str_free (&modes);
str_free (&params);
}
}
static void
mass_channel_mode_mask_list
(struct handler_args *a, bool adding, char mode_char)
{
struct strv v = strv_make ();
cstr_split (a->arguments, " ", true, &v);
// XXX: this may be a bit too trivial; we could also map nicknames
// to information from WHO polling or userhost-in-names
for (size_t i = 0; i < v.len; i++)
{
char *target = v.vector[i];
if (strpbrk (target, "!@*?") || irc_is_extban (a->s, target))
continue;
v.vector[i] = xstrdup_printf ("%s!*@*", target);
free (target);
}
mass_channel_mode (a->s, a->channel_name, adding, mode_char, &v);
strv_free (&v);
}
static bool
handle_command_ban (struct handler_args *a)
{
if (*a->arguments)
mass_channel_mode_mask_list (a, true, 'b');
else
irc_send (a->s, "MODE %s +b", a->channel_name);
return true;
}
static bool
handle_command_unban (struct handler_args *a)
{
if (*a->arguments)
mass_channel_mode_mask_list (a, false, 'b');
else
return false;
return true;
}
static bool
handle_command_invite (struct handler_args *a)
{
struct strv v = strv_make ();
cstr_split (a->arguments, " ", true, &v);
bool result = !!v.len;
for (size_t i = 0; i < v.len; i++)
irc_send (a->s, "INVITE %s %s", v.vector[i], a->channel_name);
strv_free (&v);
return result;
}
static struct server *
resolve_server (struct app_context *ctx, struct handler_args *a,
const char *command_name)
{
struct server *s = NULL;
if (*a->arguments)
{
char *server_name = cut_word (&a->arguments);
if (!(s = str_map_find (&ctx->servers, server_name)))
log_global_error (ctx, "/#s: #s: #s",
command_name, "no such server", server_name);
}
else if (a->buffer->type == BUFFER_GLOBAL)
log_global_error (ctx, "/#s: #s",
command_name, "no server name given and this buffer is global");
else
s = a->buffer->server;
return s;
}
static bool
handle_command_connect (struct handler_args *a)
{
struct server *s = NULL;
if (!(s = resolve_server (a->ctx, a, "connect")))
return true;
if (irc_is_connected (s))
{
log_server_error (s, s->buffer, "Already connected");
return true;
}
if (s->state == IRC_CONNECTING)
irc_destroy_connector (s);
irc_cancel_timers (s);
s->reconnect_attempt = 0;
irc_initiate_connect (s);
return true;
}
static bool
handle_command_disconnect (struct handler_args *a)
{
struct server *s = NULL;
if (!(s = resolve_server (a->ctx, a, "disconnect")))
return true;
if (s->state == IRC_CONNECTING)
{
log_server_status (s, s->buffer, "Connecting aborted");
irc_destroy_connector (s);
}
else if (poller_timer_is_active (&s->reconnect_tmr))
{
log_server_status (s, s->buffer, "Connecting aborted");
poller_timer_reset (&s->reconnect_tmr);
}
else if (!irc_is_connected (s))
log_server_error (s, s->buffer, "Not connected");
else
irc_initiate_disconnect (s, *a->arguments ? a->arguments : NULL);
return true;
}
static bool
show_servers_list (struct app_context *ctx)
{
log_global_indent (ctx, "");
log_global_indent (ctx, "Servers list:");
struct str_map_iter iter = str_map_iter_make (&ctx->servers);
struct server *s;
while ((s = str_map_iter_next (&iter)))
log_global_indent (ctx, " #s", s->name);
return true;
}
static bool
handle_server_add (struct handler_args *a)
{
if (!*a->arguments)
return false;
struct app_context *ctx = a->ctx;
char *name = cut_word (&a->arguments);
const char *err;
if ((err = check_server_name_for_addition (ctx, name)))
log_global_error (ctx, "Cannot create server `#s': #s", name, err);
else
{
server_add_new (ctx, name);
log_global_status (ctx, "Server added: #s", name);
}
return true;
}
static bool
handle_server_remove (struct handler_args *a)
{
struct app_context *ctx = a->ctx;
struct server *s = NULL;
if (!(s = resolve_server (ctx, a, "server")))
return true;
if (irc_is_connected (s))
log_server_error (s, s->buffer, "Can't remove a connected server");
else
{
char *name = xstrdup (s->name);
server_remove (ctx, s);
log_global_status (ctx, "Server removed: #s", name);
free (name);
}
return true;
}
static bool
handle_server_rename (struct handler_args *a)
{
struct app_context *ctx = a->ctx;
if (!*a->arguments)
return false;
char *old_name = cut_word (&a->arguments);
if (!*a->arguments)
return false;
char *new_name = cut_word (&a->arguments);
struct server *s;
const char *err;
if (!(s = str_map_find (&ctx->servers, old_name)))
log_global_error (ctx, "/#s: #s: #s",
"server", "no such server", old_name);
else if ((err = check_server_name_for_addition (ctx, new_name)))
log_global_error (ctx,
"Cannot rename server to `#s': #s", new_name, err);
else
{
server_rename (ctx, s, new_name);
log_global_status (ctx, "Server renamed: #s to #s", old_name, new_name);
}
return true;
}
static bool
handle_command_server (struct handler_args *a)
{
if (!*a->arguments)
return show_servers_list (a->ctx);
char *action = cut_word (&a->arguments);
if (!strcasecmp_ascii (action, "list"))
return show_servers_list (a->ctx);
if (!strcasecmp_ascii (action, "add"))
return handle_server_add (a);
if (!strcasecmp_ascii (action, "remove"))
return handle_server_remove (a);
if (!strcasecmp_ascii (action, "rename"))
return handle_server_rename (a);
return false;
}
static bool
handle_command_names (struct handler_args *a)
{
char *channel_name = try_get_channel (a, maybe_cut_word);
if (channel_name)
irc_send (a->s, "NAMES %s", channel_name);
else
irc_send (a->s, "NAMES");
return true;
}
static bool
handle_command_whois (struct handler_args *a)
{
if (*a->arguments)
irc_send (a->s, "WHOIS %s", a->arguments);
else if (a->buffer->type == BUFFER_PM)
irc_send (a->s, "WHOIS %s", a->buffer->user->nickname);
else if (a->buffer->type == BUFFER_SERVER)
irc_send (a->s, "WHOIS %s", a->s->irc_user->nickname);
else
log_server_error (a->s, a->buffer, "#s: #s", "Can't request info",
"no target given and this buffer is neither a PM nor a server");
return true;
}
static bool
handle_command_whowas (struct handler_args *a)
{
if (*a->arguments)
irc_send (a->s, "WHOWAS %s", a->arguments);
else if (a->buffer->type == BUFFER_PM)
irc_send (a->s, "WHOWAS %s", a->buffer->user->nickname);
else
log_server_error (a->s, a->buffer, "#s: #s", "Can't request info",
"no target given and this buffer is not a PM");
return true;
}
static bool
handle_command_kill (struct handler_args *a)
{
if (!*a->arguments)
return false;
char *target = cut_word (&a->arguments);
if (*a->arguments)
irc_send (a->s, "KILL %s :%s", target, a->arguments);
else
irc_send (a->s, "KILL %s", target);
return true;
}
static bool
handle_command_nick (struct handler_args *a)
{
if (!*a->arguments)
return false;
irc_send (a->s, "NICK %s", cut_word (&a->arguments));
return true;
}
static bool
handle_command_quote (struct handler_args *a)
{
irc_send (a->s, "%s", a->arguments);
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
handle_command_channel_mode
(struct handler_args *a, bool adding, char mode_char)
{
const char *targets = a->arguments;
if (!*targets)
{
if (adding)
return false;
targets = a->s->irc_user->nickname;
}
struct strv v = strv_make ();
cstr_split (targets, " ", true, &v);
mass_channel_mode (a->s, a->channel_name, adding, mode_char, &v);
strv_free (&v);
return true;
}
#define CHANMODE_HANDLER(name, adding, mode_char) \
static bool \
handle_command_ ## name (struct handler_args *a) \
{ \
return handle_command_channel_mode (a, (adding), (mode_char)); \
}
CHANMODE_HANDLER (op, true, 'o') CHANMODE_HANDLER (deop, false, 'o')
CHANMODE_HANDLER (voice, true, 'v') CHANMODE_HANDLER (devoice, false, 'v')
#define TRIVIAL_HANDLER(name, command) \
static bool \
handle_command_ ## name (struct handler_args *a) \
{ \
if (*a->arguments) \
irc_send (a->s, command " %s", a->arguments); \
else \
irc_send (a->s, command); \
return true; \
}
TRIVIAL_HANDLER (list, "LIST")
TRIVIAL_HANDLER (who, "WHO")
TRIVIAL_HANDLER (motd, "MOTD")
TRIVIAL_HANDLER (oper, "OPER")
TRIVIAL_HANDLER (stats, "STATS")
TRIVIAL_HANDLER (away, "AWAY")
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool handle_command_help (struct handler_args *);
static struct command_handler
{
const char *name;
const char *description;
const char *usage;
bool (*handler) (struct handler_args *a);
enum handler_flags flags;
}
g_command_handlers[] =
{
{ "help", "Show help",
"[<command> | <option>]",
handle_command_help, 0 },
{ "quit", "Quit the program",
"[<message>]",
handle_command_quit, 0 },
{ "buffer", "Manage buffers",
"<N> | list | clear | move <N> | goto <N or name> | close [<N or name>]",
handle_command_buffer, 0 },
{ "set", "Manage configuration",
"[<option>]",
handle_command_set, 0 },
{ "save", "Save configuration",
NULL,
handle_command_save, 0 },
{ "plugin", "Manage plugins",
"list | load <name> | unload <name>",
handle_command_plugin, 0 },
{ "relay", "Show relay information",
NULL,
handle_command_relay, 0 },
{ "alias", "List or set aliases",
"[<name> <definition>]",
handle_command_alias, 0 },
{ "unalias", "Unset aliases",
"<name>...",
handle_command_unalias, 0 },
{ "msg", "Send message to a nick or channel",
"<target> <message>",
handle_command_msg, HANDLER_SERVER | HANDLER_NEEDS_REG },
{ "query", "Send a private message to a nick",
"<nick> <message>",
handle_command_query, HANDLER_SERVER | HANDLER_NEEDS_REG },
{ "notice", "Send notice to a nick or channel",
"<target> <message>",
handle_command_notice, HANDLER_SERVER | HANDLER_NEEDS_REG },
{ "squery", "Send a message to a service",
"<service> <message>",
handle_command_squery, HANDLER_SERVER | HANDLER_NEEDS_REG },
{ "ctcp", "Send a CTCP query",
"<target> <tag>",
handle_command_ctcp, HANDLER_SERVER | HANDLER_NEEDS_REG },
{ "me", "Send a CTCP action",
"<message>",
handle_command_me, HANDLER_SERVER | HANDLER_NEEDS_REG },
{ "join", "Join channels",
"[<channel>[,<channel>...]] [<key>[,<key>...]]",
handle_command_join, HANDLER_SERVER },
{ "part", "Leave channels",
"[<channel>[,<channel>...]] [<reason>]",
handle_command_part, HANDLER_SERVER },
{ "cycle", "Rejoin channels",
"[<channel>[,<channel>...]] [<reason>]",
handle_command_cycle, HANDLER_SERVER },
{ "op", "Give channel operator status",
"<nick>...",
handle_command_op, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "deop", "Remove channel operator status",
"[<nick>...]",
handle_command_deop, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "voice", "Give voice",
"<nick>...",
handle_command_voice, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "devoice", "Remove voice",
"[<nick>...]",
handle_command_devoice, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "mode", "Change mode",
"[<channel>] [<mode>...]",
handle_command_mode, HANDLER_SERVER },
{ "topic", "Change topic",
"[<channel>] [<topic>]",
handle_command_topic, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "kick", "Kick user from channel",
"[<channel>] <user> [<reason>]",
handle_command_kick, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "kickban", "Kick and ban user from channel",
"[<channel>] <user> [<reason>]",
handle_command_kickban, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "ban", "Ban user from channel",
"[<channel>] [<mask>...]",
handle_command_ban, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "unban", "Unban user from channel",
"[<channel>] <mask>...",
handle_command_unban, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
{ "invite", "Invite user to channel",
"<user>... [<channel>]",
handle_command_invite, HANDLER_SERVER | HANDLER_CHANNEL_LAST },
{ "server", "Manage servers",
"list | add <name> | remove <name> | rename <old> <new>",
handle_command_server, 0 },
{ "connect", "Connect to the server",
"[<server>]",
handle_command_connect, 0 },
{ "disconnect", "Disconnect from the server",
"[<server> [<reason>]]",
handle_command_disconnect, 0 },
{ "list", "List channels and their topic",
"[<channel>[,<channel>...]] [<target>]",
handle_command_list, HANDLER_SERVER },
{ "names", "List users on channel",
"[<channel>[,<channel>...]]",
handle_command_names, HANDLER_SERVER },
{ "who", "List users",
"[<mask> [o]]",
handle_command_who, HANDLER_SERVER },
{ "whois", "Get user information",
"[<target>] <mask>",
handle_command_whois, HANDLER_SERVER },
{ "whowas", "Get user information",
"<user> [<count> [<target>]]",
handle_command_whowas, HANDLER_SERVER },
{ "motd", "Get the Message of The Day",
"[<target>]",
handle_command_motd, HANDLER_SERVER },
{ "oper", "Authenticate as an IRC operator",
"<name> <password>",
handle_command_oper, HANDLER_SERVER },
{ "kill", "Kick another user from the server",
"<user> <comment>",
handle_command_kill, HANDLER_SERVER },
{ "stats", "Query server statistics",
"[<query> [<target>]]",
handle_command_stats, HANDLER_SERVER },
{ "away", "Set away status",
"[<text>]",
handle_command_away, HANDLER_SERVER },
{ "nick", "Change current nick",
"<nickname>",
handle_command_nick, HANDLER_SERVER },
{ "quote", "Send a raw command to the server",
"<command>",
handle_command_quote, HANDLER_SERVER },
};
static bool
try_handle_command_help_option (struct app_context *ctx, const char *name)
{
struct config_item *item =
config_item_get (ctx->config.root, name, NULL);
if (!item)
return false;
struct config_schema *schema = item->schema;
if (!schema)
{
log_global_error (ctx, "#s: #s", "Option not recognized", name);
return true;
}
log_global_indent (ctx, "");
log_global_indent (ctx, "Option \"#s\":", name);
log_global_indent (ctx, " Description: #s",
schema->comment ? schema->comment : "(none)");
log_global_indent (ctx, " Type: #s", config_item_type_name (schema->type));
log_global_indent (ctx, " Default: #s",
schema->default_ ? schema->default_ : "null");
struct str tmp = str_make ();
config_item_write (item, false, &tmp);
log_global_indent (ctx, " Current value: #s", tmp.str);
str_free (&tmp);
return true;
}
static bool
show_command_list (struct app_context *ctx)
{
log_global_indent (ctx, "");
log_global_indent (ctx, "Commands:");
int longest = 0;
for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
{
int len = strlen (g_command_handlers[i].name);
longest = MAX (longest, len);
}
for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
{
struct command_handler *handler = &g_command_handlers[i];
log_global_indent (ctx, " #&s", xstrdup_printf
("%-*s %s", longest, handler->name, handler->description));
}
return true;
}
static bool
show_command_help (struct app_context *ctx, struct command_handler *handler)
{
log_global_indent (ctx, "");
log_global_indent (ctx, "/#s: #s", handler->name, handler->description);
log_global_indent (ctx, " Arguments: #s",
handler->usage ? handler->usage : "(none)");
return true;
}
static bool
handle_command_help (struct handler_args *a)
{
struct app_context *ctx = a->ctx;
if (!*a->arguments)
return show_command_list (ctx);
const char *word = cut_word (&a->arguments);
const char *command = word + (*word == '/');
for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
{
struct command_handler *handler = &g_command_handlers[i];
if (!strcasecmp_ascii (command, handler->name))
return show_command_help (ctx, handler);
}
if (try_handle_command_help_option (ctx, word))
return true;
if (str_map_find (get_aliases_config (ctx), command))
log_global_status (ctx, "/#s is an alias", command);
else
log_global_error (ctx, "#s: #s", "No such command or option", word);
return true;
}
static void
init_user_command_map (struct str_map *map)
{
*map = str_map_make (NULL);
map->key_xfrm = tolower_ascii_strxfrm;
for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
{
struct command_handler *handler = &g_command_handlers[i];
str_map_set (map, handler->name, handler);
}
}
static bool
process_user_command (struct app_context *ctx, struct buffer *buffer,
const char *command_name, char *input)
{
static bool initialized = false;
static struct str_map map;
if (!initialized)
{
init_user_command_map (&map);
initialized = true;
}
if (try_handle_buffer_goto (ctx, command_name))
return true;
struct handler_args args =
{
.ctx = ctx,
.buffer = buffer,
.arguments = input,
};
struct command_handler *handler;
if (!(handler = str_map_find (&map, command_name)))
return false;
hard_assert (handler->flags == 0 || (handler->flags & HANDLER_SERVER));
if ((handler->flags & HANDLER_SERVER)
&& args.buffer->type == BUFFER_GLOBAL)
log_global_error (ctx, "/#s: #s",
command_name, "can't do this from a global buffer");
else if ((handler->flags & HANDLER_SERVER)
&& !irc_is_connected ((args.s = args.buffer->server)))
log_server_error (args.s, args.s->buffer, "Not connected");
else if ((handler->flags & HANDLER_NEEDS_REG)
&& args.s->state != IRC_REGISTERED)
log_server_error (args.s, args.s->buffer, "Not registered");
else if (((handler->flags & HANDLER_CHANNEL_FIRST)
&& !(args.channel_name =
try_get_channel (&args, maybe_cut_word)))
|| ((handler->flags & HANDLER_CHANNEL_LAST)
&& !(args.channel_name =
try_get_channel (&args, maybe_cut_word_from_end))))
log_server_error (args.s, args.buffer, "/#s: #s", command_name,
"no channel name given and this buffer is not a channel");
else if (!handler->handler (&args))
log_global_error (ctx,
"#s: /#s #s", "Usage", handler->name, handler->usage);
return true;
}
static const char *
expand_alias_escape (const char *p, const char *arguments, struct str *output)
{
struct strv words = strv_make ();
cstr_split (arguments, " ", true, &words);
// TODO: eventually also add support for argument ranges
// - Can use ${0}, ${0:}, ${:0}, ${1:-1} with strtol, dispose of $1 syntax
// (default aliases don't use numeric arguments).
// - Start numbering from zero, since we'd have to figure out what to do
// in case we encounter a zero if we keep the current approach.
// - Ignore the sequence altogether if no closing '}' can be found,
// or if the internal format doesn't fit the above syntax.
if (*p >= '1' && *p <= '9')
{
size_t offset = *p - '1';
if (offset < words.len)
str_append (output, words.vector[offset]);
}
else if (*p == '*')
str_append (output, arguments);
else if (strchr ("$;", *p))
str_append_c (output, *p);
else
str_append_printf (output, "$%c", *p);
strv_free (&words);
return ++p;
}
static void
expand_alias_definition (const char *definition, const char *arguments,
struct strv *commands)
{
struct str expanded = str_make ();
bool escape = false;
for (const char *p = definition; *p; p++)
{
if (escape)
{
p = expand_alias_escape (p, arguments, &expanded) - 1;
escape = false;
}
else if (*p == ';')
{
strv_append_owned (commands, str_steal (&expanded));
expanded = str_make ();
}
else if (*p == '$' && p[1])
escape = true;
else
str_append_c (&expanded, *p);
}
strv_append_owned (commands, str_steal (&expanded));
}
static bool
expand_alias (struct app_context *ctx,
const char *alias_name, char *input, struct strv *commands)
{
struct config_item *entry =
str_map_find (get_aliases_config (ctx), alias_name);
if (!entry)
return false;
if (!config_item_type_is_string (entry->type))
{
log_global_error (ctx, "Error executing `/#s': #s",
alias_name, "alias definition is not a string");
return false;
}
expand_alias_definition (entry->value.string.str, input, commands);
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
send_message_to_target (struct server *s,
const char *target, char *message, struct buffer *buffer)
{
if (!irc_is_connected (s))
log_server_error (s, buffer, "Not connected");
else
SEND_AUTOSPLIT_PRIVMSG (s, target, message);
}
static void
send_message_to_buffer (struct app_context *ctx, struct buffer *buffer,
char *message)
{
hard_assert (buffer != NULL);
switch (buffer->type)
{
case BUFFER_CHANNEL:
send_message_to_target (buffer->server,
buffer->channel->name, message, buffer);
break;
case BUFFER_PM:
send_message_to_target (buffer->server,
buffer->user->nickname, message, buffer);
break;
default:
log_full (ctx, NULL, buffer, 0, BUFFER_LINE_ERROR,
"This buffer is not a channel");
}
}
static bool
process_alias (struct app_context *ctx, struct buffer *buffer,
struct strv *commands, int level)
{
for (size_t i = 0; i < commands->len; i++)
log_global_debug (ctx, "Alias expanded to: ###d: \"#s\"",
(int) i, commands->vector[i]);
for (size_t i = 0; i < commands->len; i++)
if (!process_input_line (ctx, buffer, commands->vector[i], ++level))
return false;
return true;
}
static bool
process_input_line_posthook (struct app_context *ctx, struct buffer *buffer,
char *input, int alias_level)
{
if (*input != '/' || *++input == '/')
{
send_message_to_buffer (ctx, buffer, input);
return true;
}
char *name = cut_word (&input);
if (process_user_command (ctx, buffer, name, input))
return true;
struct strv commands = strv_make ();
bool result = false;
if (!expand_alias (ctx, name, input, &commands))
log_global_error (ctx, "#s: /#s", "No such command or alias", name);
else if (alias_level != 0)
log_global_error (ctx, "#s: /#s", "Aliases can't nest", name);
else
result = process_alias (ctx, buffer, &commands, alias_level);
strv_free (&commands);
return result;
}
static char *
process_input_hooks (struct app_context *ctx, struct buffer *buffer,
char *input)
{
uint64_t hash = siphash_wrapper (input, strlen (input));
LIST_FOR_EACH (struct hook, iter, ctx->input_hooks)
{
struct input_hook *hook = (struct input_hook *) iter;
if (!(input = hook->filter (hook, buffer, input)))
{
log_global_debug (ctx, "Input thrown away by hook");
return NULL;
}
uint64_t new_hash = siphash_wrapper (input, strlen (input));
if (new_hash != hash)
log_global_debug (ctx, "Input transformed to \"#s\"#r", input);
hash = new_hash;
}
return input;
}
static bool
process_input_line (struct app_context *ctx, struct buffer *buffer,
const char *input, int alias_level)
{
// Note that this also gets called on expanded aliases,
// which might or might not be desirable (we can forward "alias_level")
char *processed = process_input_hooks (ctx, buffer, xstrdup (input));
bool result = !processed
|| process_input_line_posthook (ctx, buffer, processed, alias_level);
free (processed);
return result;
}
static void
process_input (struct app_context *ctx, struct buffer *buffer,
const char *input)
{
struct strv lines = strv_make ();
cstr_split (input, "\r\n", false, &lines);
for (size_t i = 0; i < lines.len; i++)
(void) process_input_line (ctx, buffer, lines.vector[i], 0);
strv_free (&lines);
}
// --- Word completion ---------------------------------------------------------
// The amount of crap that goes into this is truly insane.
// It's mostly because of Editline's total ignorance of this task.
static void
completion_free (struct completion *self)
{
free (self->line);
free (self->words);
}
static void
completion_add_word (struct completion *self, size_t start, size_t end)
{
if (!self->words)
self->words = xcalloc ((self->words_alloc = 4), sizeof *self->words);
if (self->words_len == self->words_alloc)
self->words = xreallocarray (self->words,
(self->words_alloc <<= 1), sizeof *self->words);
self->words[self->words_len++] = (struct completion_word) { start, end };
}
static struct completion
completion_make (const char *line, size_t len)
{
struct completion self = { .line = xstrndup (line, len) };
// The first and the last word may be empty
const char *s = self.line;
while (true)
{
const char *start = s;
size_t word_len = strcspn (s, WORD_BREAKING_CHARS);
const char *end = start + word_len;
s = end + strspn (end, WORD_BREAKING_CHARS);
completion_add_word (&self, start - self.line, end - self.line);
if (s == end)
break;
}
return self;
}
static void
completion_locate (struct completion *self, size_t offset)
{
size_t i = 0;
for (; i < self->words_len; i++)
if (self->words[i].start > offset)
break;
self->location = i - 1;
}
static char *
completion_word (struct completion *self, int word)
{
hard_assert (word >= 0 && word < (int) self->words_len);
return xstrndup (self->line + self->words[word].start,
self->words[word].end - self->words[word].start);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// XXX: this isn't completely right because Unicode, but let's keep it simple.
// At worst it will stop before a combining mark, or fail to compare
// non-ASCII identifiers case-insensitively.
static size_t
utf8_common_prefix (const char **vector, size_t len)
{
size_t prefix = 0;
if (!vector || !len)
return 0;
struct utf8_iter a[len];
for (size_t i = 0; i < len; i++)
a[i] = utf8_iter_make (vector[i]);
size_t ch_len;
int32_t ch;
while ((ch = utf8_iter_next (&a[0], &ch_len)) >= 0)
{
for (size_t i = 1; i < len; i++)
{
int32_t other = utf8_iter_next (&a[i], NULL);
if (ch == other)
continue;
// Not bothering with lowercasing non-ASCII
if (ch >= 0x80 || other >= 0x80
|| tolower_ascii (ch) != tolower_ascii (other))
return prefix;
}
prefix += ch_len;
}
return prefix;
}
static void
complete_command (struct app_context *ctx, struct completion *data,
const char *word, struct strv *output)
{
(void) data;
const char *prefix = "";
if (*word == '/')
{
word++;
prefix = "/";
}
size_t word_len = strlen (word);
for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
{
struct command_handler *handler = &g_command_handlers[i];
if (!strncasecmp_ascii (word, handler->name, word_len))
strv_append_owned (output,
xstrdup_printf ("%s%s", prefix, handler->name));
}
struct str_map_iter iter = str_map_iter_make (get_aliases_config (ctx));
struct config_item *alias;
while ((alias = str_map_iter_next (&iter)))
{
if (!strncasecmp_ascii (word, iter.link->key, word_len))
strv_append_owned (output,
xstrdup_printf ("%s%s", prefix, iter.link->key));
}
}
static void
complete_option (struct app_context *ctx, struct completion *data,
const char *word, struct strv *output)
{
(void) data;
struct strv options = strv_make ();
config_dump (ctx->config.root, &options);
strv_sort (&options);
// Wildcard expansion is an interesting side-effect
char *mask = xstrdup_printf ("%s*", word);
for (size_t i = 0; i < options.len; i++)
{
char *key = cstr_cut_until (options.vector[i], " ");
if (!fnmatch (mask, key, 0))
strv_append_owned (output, key);
else
free (key);
}
free (mask);
strv_free (&options);
}
static void
complete_set_value (struct config_item *item, const char *word,
struct strv *output)
{
struct str serialized = str_make ();
config_item_write (item, false, &serialized);
if (!strncmp (serialized.str, word, strlen (word)))
strv_append_owned (output, str_steal (&serialized));
else
str_free (&serialized);
}
static void
complete_set_value_array (struct config_item *item, const char *word,
struct strv *output)
{
if (!item->schema || item->schema->type != CONFIG_ITEM_STRING_ARRAY)
return;
struct strv items = strv_make ();
cstr_split (item->value.string.str, ",", false, &items);
for (size_t i = 0; i < items.len; i++)
{
struct str wrapped = str_from_cstr (items.vector[i]);
struct str serialized = str_make ();
config_item_write_string (&serialized, &wrapped);
str_free (&wrapped);
if (!strncmp (serialized.str, word, strlen (word)))
strv_append_owned (output, str_steal (&serialized));
else
str_free (&serialized);
}
strv_free (&items);
}
static void
complete_set (struct app_context *ctx, struct completion *data,
const char *word, struct strv *output)
{
if (data->location == 1)
{
complete_option (ctx, data, word, output);
return;
}
if (data->location != 3)
return;
char *key = completion_word (data, 1);
struct config_item *item = config_item_get (ctx->config.root, key, NULL);
if (item)
{
char *op = completion_word (data, 2);
if (!strcmp (op, "-=")) complete_set_value_array (item, word, output);
if (!strcmp (op, "=")) complete_set_value (item, word, output);
free (op);
}
free (key);
}
static void
complete_topic (struct buffer *buffer, struct completion *data,
const char *word, struct strv *output)
{
(void) data;
// TODO: make it work in other server-related buffers, too, i.e. when we're
// completing the third word and the second word is a known channel name
if (buffer->type != BUFFER_CHANNEL)
return;
const char *topic = buffer->channel->topic;
if (topic && !strncasecmp_ascii (word, topic, strlen (word)))
{
// We must prepend the channel name if the topic itself starts
// with something that could be regarded as a channel name
strv_append_owned (output, irc_is_channel (buffer->server, topic)
? xstrdup_printf ("%s %s", buffer->channel->name, topic)
: xstrdup (topic));
}
}
static void
complete_nicknames (struct buffer *buffer, struct completion *data,
const char *word, struct strv *output)
{
if (buffer->type == BUFFER_SERVER)
{
struct user *self_user = buffer->server->irc_user;
if (self_user)
strv_append (output, self_user->nickname);
}
if (buffer->type != BUFFER_CHANNEL)
return;
size_t word_len = strlen (word);
LIST_FOR_EACH (struct channel_user, iter, buffer->channel->users)
{
const char *nickname = iter->user->nickname;
if (irc_server_strncmp (buffer->server, word, nickname, word_len))
continue;
strv_append_owned (output, data->location == 0
? xstrdup_printf ("%s:", nickname)
: xstrdup (nickname));
}
}
static struct strv
complete_word (struct app_context *ctx, struct buffer *buffer,
struct completion *data, const char *word)
{
char *initial = completion_word (data, 0);
// Start with a placeholder for the longest common prefix
struct strv words = strv_make ();
strv_append_owned (&words, NULL);
if (data->location == 0 && *initial == '/')
complete_command (ctx, data, word, &words);
else if (data->location >= 1 && !strcmp (initial, "/set"))
complete_set (ctx, data, word, &words);
else if (data->location == 1 && !strcmp (initial, "/help"))
{
complete_command (ctx, data, word, &words);
complete_option (ctx, data, word, &words);
}
else if (data->location == 1 && !strcmp (initial, "/topic"))
{
complete_topic (buffer, data, word, &words);
complete_nicknames (buffer, data, word, &words);
}
else
complete_nicknames (buffer, data, word, &words);
cstr_set (&initial, NULL);
LIST_FOR_EACH (struct hook, iter, ctx->completion_hooks)
{
struct completion_hook *hook = (struct completion_hook *) iter;
hook->complete (hook, data, word, &words);
}
if (words.len <= 2)
{
// When nothing matches, this copies the sentinel value
words.vector[0] = words.vector[1];
words.vector[1] = NULL;
words.len--;
}
else
{
size_t prefix = utf8_common_prefix
((const char **) words.vector + 1, words.len - 1);
if (!prefix)
words.vector[0] = xstrdup (word);
else
words.vector[0] = xstrndup (words.vector[1], prefix);
}
return words;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/// A special wrapper for iconv_xstrdup() that also fixes indexes into the
/// original string to point to the right location in the output.
/// Thanks, Readline! Without you I would have never needed to deal with this.
static char *
locale_to_utf8 (struct app_context *ctx, const char *locale,
int *indexes[], size_t n_indexes)
{
mbstate_t state;
memset (&state, 0, sizeof state);
size_t remaining = strlen (locale) + 1;
const char *p = locale;
// Reset the shift state, FWIW
// TODO: Don't use this iconv handle directly at all, elsewhere in xC.
// And ideally use U+FFFD with EILSEQ.
(void) iconv (ctx->term_to_utf8, NULL, NULL, NULL, NULL);
bool fixed[n_indexes];
memset (fixed, 0, sizeof fixed);
struct str utf8 = str_make ();
while (true)
{
size_t len = mbrlen (p, remaining, &state);
// Incomplete multibyte character or illegal sequence (probably)
if (len == (size_t) -2
|| len == (size_t) -1)
{
str_free (&utf8);
return NULL;
}
// Convert indexes into the multibyte string to UTF-8
for (size_t i = 0; i < n_indexes; i++)
if (!fixed[i] && *indexes[i] <= p - locale)
{
*indexes[i] = utf8.len;
fixed[i] = true;
}
// End of string
if (!len)
break;
// EINVAL (incomplete sequence) should never happen and
// EILSEQ neither because we've already checked for that with mbrlen().
// E2BIG is what iconv_xstrdup solves. This must succeed.
size_t ch_len;
char *ch = iconv_xstrdup (ctx->term_to_utf8, (char *) p, len, &ch_len);
hard_assert (ch != NULL);
str_append_data (&utf8, ch, ch_len);
free (ch);
p += len;
remaining -= len;
}
return str_steal (&utf8);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static struct strv
make_completions (struct app_context *ctx, struct buffer *buffer,
const char *line_utf8, size_t start, size_t end)
{
struct completion comp = completion_make (line_utf8, strlen (line_utf8));
completion_locate (&comp, start);
char *word = xstrndup (line_utf8 + start, end - start);
struct strv completions = complete_word (ctx, buffer, &comp, word);
free (word);
completion_free (&comp);
return completions;
}
/// Takes a line in locale-specific encoding and position of a word to complete,
/// returns a vector of matches in locale-specific encoding.
static char **
make_input_completions
(struct app_context *ctx, const char *line, int start, int end)
{
int *fixes[] = { &start, &end };
char *line_utf8 = locale_to_utf8 (ctx, line, fixes, N_ELEMENTS (fixes));
if (!line_utf8)
return NULL;
hard_assert (start >= 0 && end >= 0 && start <= end);
struct strv completions =
make_completions (ctx, ctx->current_buffer, line_utf8, start, end);
free (line_utf8);
if (!completions.len)
{
strv_free (&completions);
return NULL;
}
for (size_t i = 0; i < completions.len; i++)
{
char *converted = iconv_xstrdup
(ctx->term_from_utf8, completions.vector[i], -1, NULL);
if (!soft_assert (converted))
converted = xstrdup ("?");
cstr_set (&completions.vector[i], converted);
}
return completions.vector;
}
// --- Common code for user actions --------------------------------------------
static void
toggle_bracketed_paste (bool enable)
{
fprintf (stdout, "\x1b[?2004%c", "lh"[enable]);
fflush (stdout);
}
static void
suspend_terminal (struct app_context *ctx)
{
// Terminal can get suspended by both the pager and SIGTSTP handling
if (ctx->terminal_suspended++ > 0)
return;
toggle_bracketed_paste (false);
CALL (ctx->input, hide);
poller_fd_reset (&ctx->tty_event);
CALL_ (ctx->input, prepare, false);
}
static void
resume_terminal (struct app_context *ctx)
{
if (--ctx->terminal_suspended > 0)
return;
update_screen_size ();
CALL_ (ctx->input, prepare, true);
CALL (ctx->input, on_tty_resized);
toggle_bracketed_paste (true);
// In theory we could just print all unseen messages but this is safer
buffer_print_backlog (ctx, ctx->current_buffer);
// Now it's safe to process any user input
poller_fd_set (&ctx->tty_event, POLLIN);
CALL (ctx->input, show);
}
static pid_t
spawn_helper_child (struct app_context *ctx)
{
suspend_terminal (ctx);
pid_t child = fork ();
switch (child)
{
case -1:
{
int saved_errno = errno;
resume_terminal (ctx);
errno = saved_errno;
break;
}
case 0:
// Put the child in a new foreground process group
hard_assert (setpgid (0, 0) != -1);
hard_assert (tcsetpgrp (STDOUT_FILENO, getpgid (0)) != -1);
break;
default:
// Make sure of it in the parent as well before continuing
(void) setpgid (child, child);
}
return child;
}
static void
redraw_screen (struct app_context *ctx)
{
// If by some circumstance we had the wrong idea
CALL (ctx->input, on_tty_resized);
update_screen_size ();
CALL (ctx->input, hide);
buffer_print_backlog (ctx, ctx->current_buffer);
CALL (ctx->input, show);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
dump_input_to_file (struct app_context *ctx, char *template, struct error **e)
{
mode_t mask = umask (S_IXUSR | S_IRWXG | S_IRWXO);
int fd = mkstemp (template);
(void) umask (mask);
if (fd < 0)
return error_set (e, "%s", strerror (errno));
char *input = CALL_ (ctx->input, get_line, NULL);
bool success = xwrite (fd, input, strlen (input), e);
free (input);
if (!success)
(void) unlink (template);
xclose (fd);
return success;
}
static char *
try_dump_input_to_file (struct app_context *ctx)
{
char *template = resolve_filename
("input.XXXXXX", resolve_relative_runtime_template);
struct error *e = NULL;
if (dump_input_to_file (ctx, template, &e))
return template;
log_global_error (ctx, "#s: #s",
"Failed to create a temporary file for editing", e->message);
error_free (e);
free (template);
return NULL;
}
static struct strv
build_editor_command (struct app_context *ctx, const char *filename)
{
struct strv argv = strv_make ();
const char *editor = get_config_string (ctx->config.root, "general.editor");
if (!editor)
{
const char *command;
if (!(command = getenv ("VISUAL"))
&& !(command = getenv ("EDITOR")))
command = "vi";
// Although most visual editors support a "+LINE" argument
// (every editor mentioned in the default value of general.editor,
// plus vi, mcedit, vis, ...), it isn't particularly useful by itself.
// We need to be able to specify the column number.
//
// Seeing as less popular software may try to process this as a filename
// and fail, do not bother with this "undocumented standard feature".
strv_append (&argv, command);
strv_append (&argv, filename);
return argv;
}
int cursor = 0;
char *input = CALL_ (ctx->input, get_line, &cursor);
hard_assert (cursor >= 0);
mbstate_t ps;
memset (&ps, 0, sizeof ps);
wchar_t wch;
size_t len, processed = 0, line_one_based = 1, column = 0;
while (processed < (size_t) cursor
&& (len = mbrtowc (&wch, input + processed, cursor - processed, &ps))
&& len != (size_t) -2 && len != (size_t) -1)
{
// Both VIM and Emacs use the caret notation with columns.
// Consciously leaving tabs broken, they're too difficult to handle.
int width = wcwidth (wch);
if (width < 0)
width = 2;
processed += len;
if (wch == '\n')
{
line_one_based++;
column = 0;
}
else
column += width;
}
free (input);
// Trivially split the command on spaces and substitute our values
struct str argument = str_make ();
for (; *editor; editor++)
{
if (*editor == ' ')
{
if (argument.len)
{
strv_append_owned (&argv, str_steal (&argument));
argument = str_make ();
}
continue;
}
if (*editor != '%' || !editor[1])
{
str_append_c (&argument, *editor);
continue;
}
// None of them are zero-length, thus words don't get lost
switch (*++editor)
{
case 'F':
str_append (&argument, filename);
continue;
case 'L':
str_append_printf (&argument, "%zu", line_one_based);
continue;
case 'C':
str_append_printf (&argument, "%zu", column + 1);
continue;
case 'B':
str_append_printf (&argument, "%d", cursor + 1);
continue;
case '%':
case ' ':
str_append_c (&argument, *editor);
continue;
}
const char *p = editor;
if (soft_assert (utf8_decode (&p, strlen (p)) > 0))
{
log_global_error (ctx, "Unknown substitution variable: %#&s",
xstrndup (editor, p - editor));
}
}
if (argument.len)
strv_append_owned (&argv, str_steal (&argument));
else
str_free (&argument);
return argv;
}
static bool
on_edit_input (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
char *filename;
if (!(filename = try_dump_input_to_file (ctx)))
return false;
struct strv argv = build_editor_command (ctx, filename);
if (!argv.len)
strv_append (&argv, "true");
hard_assert (!ctx->running_editor);
switch (spawn_helper_child (ctx))
{
case 0:
execvp (argv.vector[0], argv.vector);
print_error ("%s: %s",
"Failed to launch editor", strerror (errno));
_exit (EXIT_FAILURE);
case -1:
log_global_error (ctx, "#s: #l",
"Failed to launch editor", strerror (errno));
free (filename);
break;
default:
ctx->running_editor = true;
ctx->editor_filename = filename;
}
strv_free (&argv);
return true;
}
static void
input_editor_process (struct app_context *ctx)
{
struct str input = str_make ();
struct error *e = NULL;
if (!read_file (ctx->editor_filename, &input, &e))
{
log_global_error (ctx, "#s: #s", "Input editing failed", e->message);
error_free (e);
}
else
CALL (ctx->input, clear_line);
if (!CALL_ (ctx->input, insert, input.str))
log_global_error (ctx, "#s: #s", "Input editing failed",
"could not re-insert the modified text");
str_free (&input);
}
static void
input_editor_cleanup (struct app_context *ctx)
{
if (unlink (ctx->editor_filename))
log_global_error (ctx, "Could not unlink `#l': #l",
ctx->editor_filename, strerror (errno));
cstr_set (&ctx->editor_filename, NULL);
ctx->running_editor = false;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
launch_pager (struct app_context *ctx,
int fd, const char *name, const char *path)
{
hard_assert (!ctx->running_pager);
switch (spawn_helper_child (ctx))
{
case 0:
dup2 (fd, STDIN_FILENO);
char *localized_name =
iconv_xstrdup (ctx->term_from_utf8, (char *) name, -1, NULL);
execl ("/bin/sh", "/bin/sh", "-c",
get_config_string (ctx->config.root, "general.pager"),
PROGRAM_NAME, localized_name, path, NULL);
print_error ("%s: %s", "Failed to launch pager", strerror (errno));
_exit (EXIT_FAILURE);
case -1:
log_global_error (ctx, "#s: #l",
"Failed to launch pager", strerror (errno));
break;
default:
ctx->running_pager = true;
}
}
static bool
display_backlog (struct app_context *ctx, int flush_opts)
{
FILE *backlog = tmpfile ();
if (!backlog)
{
log_global_error (ctx, "#s: #l",
"Failed to create a temporary file", strerror (errno));
return false;
}
if (!get_config_boolean (ctx->config.root,
"general.pager_strip_formatting"))
flush_opts |= FLUSH_OPT_RAW;
struct buffer *buffer = ctx->current_buffer;
int until_marker =
(int) buffer->lines_count - (int) buffer->new_messages_count;
for (struct buffer_line *line = buffer->lines; line; line = line->next)
{
if (until_marker-- == 0
&& buffer->new_messages_count != buffer->lines_count)
buffer_print_read_marker (ctx, backlog, flush_opts);
if (buffer_line_will_show_up (buffer, line))
buffer_line_write_to_backlog (ctx, line, backlog, flush_opts);
}
// So that it is obvious if the last line in the buffer is not from today
buffer_update_time (ctx, time (NULL), backlog, flush_opts);
rewind (backlog);
set_cloexec (fileno (backlog));
launch_pager (ctx, fileno (backlog), buffer->name, NULL);
fclose (backlog);
return true;
}
static bool
on_display_backlog (int count, int key, void *user_data)
{
(void) count;
(void) key;
return display_backlog (user_data, 0);
}
static bool
on_display_backlog_nowrap (int count, int key, void *user_data)
{
(void) count;
(void) key;
return display_backlog (user_data, FLUSH_OPT_NOWRAP);
}
static FILE *
open_log_path (struct app_context *ctx, struct buffer *buffer, const char *path)
{
FILE *fp = fopen (path, "rb");
if (!fp)
{
log_global_error (ctx,
"Failed to open `#l': #l", path, strerror (errno));
return NULL;
}
if (buffer->log_file)
// The regular flush will log any error eventually
(void) fflush (buffer->log_file);
set_cloexec (fileno (fp));
return fp;
}
static bool
on_display_full_log (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
struct buffer *buffer = ctx->current_buffer;
char *path = buffer_get_log_path (buffer);
FILE *full_log = open_log_path (ctx, buffer, path);
if (!full_log)
{
free (path);
return false;
}
launch_pager (ctx, fileno (full_log), buffer->name, path);
fclose (full_log);
free (path);
return true;
}
static bool
on_toggle_unimportant (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
buffer_toggle_unimportant (ctx, ctx->current_buffer);
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
on_goto_buffer (int count, int key, void *user_data)
{
(void) count;
struct app_context *ctx = user_data;
int n = key - '0';
if (n < 0 || n > 9)
return false;
// There's no buffer zero
if (n == 0)
n = 10;
if (!ctx->last_buffer || buffer_get_index (ctx, ctx->current_buffer) != n)
return buffer_goto (ctx, n);
// Fast switching between two buffers
buffer_activate (ctx, ctx->last_buffer);
return true;
}
static bool
on_previous_buffer (int count, int key, void *user_data)
{
(void) key;
buffer_activate (user_data, buffer_previous (user_data, count));
return true;
}
static bool
on_next_buffer (int count, int key, void *user_data)
{
(void) key;
buffer_activate (user_data, buffer_next (user_data, count));
return true;
}
static bool
on_switch_buffer (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
if (!ctx->last_buffer)
return false;
buffer_activate (ctx, ctx->last_buffer);
return true;
}
static bool
on_goto_highlight (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
struct buffer *iter = ctx->current_buffer;;
do
{
if (!(iter = iter->next))
iter = ctx->buffers;
if (iter == ctx->current_buffer)
return false;
}
while (!iter->highlighted);
buffer_activate (ctx, iter);
return true;
}
static bool
on_goto_activity (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
struct buffer *iter = ctx->current_buffer;
do
{
if (!(iter = iter->next))
iter = ctx->buffers;
if (iter == ctx->current_buffer)
return false;
}
while (iter->new_messages_count == iter->new_unimportant_count);
buffer_activate (ctx, iter);
return true;
}
static bool
on_move_buffer_left (int count, int key, void *user_data)
{
(void) key;
struct app_context *ctx = user_data;
int total = buffer_count (ctx);
int n = buffer_get_index (ctx, ctx->current_buffer) - count;
buffer_move (ctx, ctx->current_buffer, n <= 0
? (total + n % total)
: ((n - 1) % total + 1));
return true;
}
static bool
on_move_buffer_right (int count, int key, void *user_data)
{
return on_move_buffer_left (-count, key, user_data);
}
static bool
on_redraw_screen (int count, int key, void *user_data)
{
(void) count;
(void) key;
redraw_screen (user_data);
return true;
}
static bool
on_insert_attribute (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
ctx->awaiting_formatting_escape = true;
return true;
}
static bool
on_start_paste_mode (int count, int key, void *user_data)
{
(void) count;
(void) key;
struct app_context *ctx = user_data;
ctx->in_bracketed_paste = true;
return true;
}
static void
input_add_functions (void *user_data)
{
struct app_context *ctx = user_data;
#define XX(...) CALL_ (ctx->input, register_fn, __VA_ARGS__, ctx);
XX ("previous-buffer", "Previous buffer", on_previous_buffer)
XX ("next-buffer", "Next buffer", on_next_buffer)
XX ("goto-buffer", "Go to buffer", on_goto_buffer)
XX ("switch-buffer", "Switch buffer", on_switch_buffer)
XX ("goto-highlight", "Go to highlight", on_goto_highlight)
XX ("goto-activity", "Go to activity", on_goto_activity)
XX ("move-buffer-left", "Move buffer left", on_move_buffer_left)
XX ("move-buffer-right", "Move buffer right", on_move_buffer_right)
XX ("display-backlog", "Show backlog", on_display_backlog)
XX ("display-backlog-nw", "Non-wrapped log", on_display_backlog_nowrap)
XX ("display-full-log", "Show full log", on_display_full_log)
XX ("toggle-unimportant", "Toggle junk msgs", on_toggle_unimportant)
XX ("edit-input", "Edit input", on_edit_input)
XX ("redraw-screen", "Redraw screen", on_redraw_screen)
XX ("insert-attribute", "IRC formatting", on_insert_attribute)
XX ("start-paste-mode", "Bracketed paste", on_start_paste_mode)
#undef XX
}
static void
bind_common_keys (struct app_context *ctx)
{
struct input *self = ctx->input;
CALL_ (self, bind_control, 'p', "previous-buffer");
CALL_ (self, bind_control, 'n', "next-buffer");
// Redefine M-0 through M-9 to switch buffers
for (int i = 0; i <= 9; i++)
CALL_ (self, bind_meta, '0' + i, "goto-buffer");
CALL_ (self, bind_meta, '\t', "switch-buffer");
CALL_ (self, bind_meta, '!', "goto-highlight");
CALL_ (self, bind_meta, 'a', "goto-activity");
CALL_ (self, bind_meta, 'm', "insert-attribute");
CALL_ (self, bind_meta, 'h', "display-full-log");
CALL_ (self, bind_meta, 'H', "toggle-unimportant");
CALL_ (self, bind_meta, 'e', "edit-input");
if (key_f5) CALL_ (self, bind, key_f5, "previous-buffer");
if (key_f6) CALL_ (self, bind, key_f6, "next-buffer");
if (key_ppage) CALL_ (self, bind, key_ppage, "display-backlog");
if (clear_screen)
CALL_ (self, bind_control, 'l', "redraw-screen");
CALL_ (self, bind, "\x1b[200~", "start-paste-mode");
}
// --- GNU Readline user actions -----------------------------------------------
#ifdef HAVE_READLINE
static int
on_readline_return (int count, int key)
{
(void) count;
(void) key;
// Let readline pass the line to our input handler
rl_done = 1;
struct app_context *ctx = g_ctx;
struct input_rl *self = (struct input_rl *) ctx->input;
// Hide the line, don't redisplay it
CALL (ctx->input, hide);
input_rl__restore (self);
return 0;
}
static void
on_readline_input (char *line)
{
struct app_context *ctx = g_ctx;
struct input_rl *self = (struct input_rl *) ctx->input;
if (line)
{
if (*line)
add_history (line);
// readline always erases the input line after returning from here,
// but we don't want that to happen if the command to be executed
// would switch the buffer (we'd keep the already executed command in
// the old buffer and delete any input restored from the new buffer)
strv_append_owned (&ctx->pending_input, line);
poller_idle_set (&ctx->input_event);
}
else
{
// Prevent readline from showing the prompt twice for w/e reason
CALL (ctx->input, hide);
input_rl__restore (self);
CALL (ctx->input, ding);
}
if (self->active)
// Readline automatically redisplays it
self->prompt_shown = 1;
}
static char **
app_readline_completion (const char *text, int start, int end)
{
// We will reconstruct that ourselves
(void) text;
// Don't iterate over filenames and stuff
rl_attempted_completion_over = true;
return make_input_completions (g_ctx, rl_line_buffer, start, end);
}
static int
app_readline_init (void)
{
struct app_context *ctx = g_ctx;
struct input *self = ctx->input;
// XXX: maybe use rl_make_bare_keymap() and start from there;
// our dear user could potentionally rig things up in a way that might
// result in some funny unspecified behaviour
// For vi mode, enabling "show-mode-in-prompt" is recommended as there is
// no easy way to indicate mode changes otherwise.
rl_add_defun ("send-line", on_readline_return, -1);
bind_common_keys (ctx);
// Move native history commands
CALL_ (self, bind_meta, 'p', "previous-history");
CALL_ (self, bind_meta, 'n', "next-history");
// We need to hide the prompt and input first
rl_bind_key (RETURN, rl_named_function ("send-line"));
CALL_ (self, bind_control, 'j', "send-line");
rl_variable_bind ("completion-ignore-case", "on");
rl_bind_key (TAB, rl_named_function ("menu-complete"));
if (key_btab)
CALL_ (self, bind, key_btab, "menu-complete-backward");
return 0;
}
#endif // HAVE_READLINE
// --- BSD Editline user actions -----------------------------------------------
#ifdef HAVE_EDITLINE
static unsigned char
on_editline_complete (EditLine *editline, int key)
{
(void) key;
struct app_context *ctx = g_ctx;
// First prepare what Readline would have normally done for us...
const LineInfo *info_mb = el_line (editline);
int len = info_mb->lastchar - info_mb->buffer;
int point = info_mb->cursor - info_mb->buffer;
char *copy = xstrndup (info_mb->buffer, len);
// XXX: possibly incorrect wrt. shift state encodings
int el_start = point, el_end = point;
while (el_start && !strchr (WORD_BREAKING_CHARS, copy[el_start - 1]))
el_start--;
char **completions = make_input_completions (ctx, copy, el_start, el_end);
// XXX: possibly incorrect wrt. shift state encodings
copy[el_end] = '\0';
int el_len = mbstowcs (NULL, copy + el_start, 0);
free (copy);
if (!completions)
return CC_REFRESH_BEEP;
// Remove the original word
el_wdeletestr (editline, el_len);
// Insert the best match instead
el_insertstr (editline, completions[0]);
// I'm not sure if Readline's menu-complete can at all be implemented
// with Editline--we have no way of detecting what the last executed handler
// was. Employ the formatter's wrapping feature to spew all options.
bool only_match = !completions[1];
if (!only_match)
{
CALL (ctx->input, hide);
redraw_screen (ctx);
struct formatter f = formatter_make (ctx, NULL);
for (char **p = completions; *++p; )
formatter_add (&f, " #l", *p);
formatter_add (&f, "\n");
formatter_flush (&f, stdout, 0);
formatter_free (&f);
CALL (ctx->input, show);
}
for (char **p = completions; *p; p++)
free (*p);
free (completions);
if (!only_match)
return CC_REFRESH_BEEP;
// If there actually is just one match, finish the word
el_insertstr (editline, " ");
return CC_REFRESH;
}
static unsigned char
on_editline_return (EditLine *editline, int key)
{
(void) key;
struct app_context *ctx = g_ctx;
struct input_el *self = (struct input_el *) ctx->input;
const LineInfoW *info = el_wline (editline);
int len = info->lastchar - info->buffer;
wchar_t *line = calloc (sizeof *info->buffer, len + 1);
memcpy (line, info->buffer, sizeof *info->buffer * len);
if (*line)
{
HistEventW ev;
history_w (self->current->history, &ev, H_ENTER, line);
}
free (line);
// on_pending_input() expects a multibyte string
const LineInfo *info_mb = el_line (editline);
strv_append_owned (&ctx->pending_input,
xstrndup (info_mb->buffer, info_mb->lastchar - info_mb->buffer));
poller_idle_set (&ctx->input_event);
// We must invoke ch_reset(), which isn't done for us with EL_UNBUFFERED.
input_el__start_over (self);
return CC_REFRESH;
}
static void
app_editline_init (struct input_el *self)
{
// el_set() leaks memory in 20150325 and other versions, we need wchar_t
el_wset (self->editline, EL_ADDFN,
L"send-line", L"Send line", on_editline_return);
el_wset (self->editline, EL_ADDFN,
L"complete", L"Complete word", on_editline_complete);
struct input *input = &self->super;
input->add_functions (input->user_data);
bind_common_keys (g_ctx);
// Move native history commands
CALL_ (input, bind_meta, 'p', "ed-prev-history");
CALL_ (input, bind_meta, 'n', "ed-next-history");
// No, editline, it's not supposed to kill the entire line
CALL_ (input, bind_control, 'w', "ed-delete-prev-word");
// Just what are you doing?
CALL_ (input, bind_control, 'u', "vi-kill-line-prev");
// We need to hide the prompt and input first
CALL_ (input, bind, "\r", "send-line");
CALL_ (input, bind, "\n", "send-line");
CALL_ (input, bind_control, 'i', "complete");
// Source the user's defaults file
el_source (self->editline, NULL);
// See input_el__redisplay(), functionally important
CALL_ (input, bind_control, 'q', "ed-redisplay");
// This is what buffered el_wgets() does, functionally important
CALL_ (input, bind_control, 'c', "ed-start-over");
}
#endif // HAVE_EDITLINE
// --- Configuration loading ---------------------------------------------------
static const char *g_first_time_help[] =
{
"",
"\x02Welcome to xC!",
"",
"To get a list of all commands, type \x02/help\x02. To obtain",
"more information on a command or option, simply add it as",
"a parameter, e.g. \x02/help set\x02 or \x02/help general.logging\x02.",
"",
"To switch between buffers, press \x02"
"F5/Ctrl-P\x02 or \x02" "F6/Ctrl-N\x02.",
"",
"Finally, adding a network is as simple as:",
" - \x02/server add IRCnet\x02",
" - \x02/set servers.IRCnet.addresses = \"open.ircnet.net\"\x02",
" - \x02/connect IRCnet\x02",
"",
"That should be enough to get you started. Have fun!",
""
};
static void
show_first_time_help (struct app_context *ctx)
{
for (size_t i = 0; i < N_ELEMENTS (g_first_time_help); i++)
log_global_indent (ctx, "#m", g_first_time_help[i]);
}
const char *g_default_aliases[][2] =
{
{ "c", "/buffer clear" }, { "close", "/buffer close" },
{ "j", "/join $*" }, { "p", "/part $*" },
{ "k", "/kick $*" }, { "kb", "/kickban $*" },
{ "m", "/msg $*" }, { "q", "/query $*" },
{ "n", "/names $*" }, { "t", "/topic $*" },
{ "w", "/who $*" }, { "wi", "/whois $*" },
{ "ww", "/whowas $*" },
};
static void
load_default_aliases (struct app_context *ctx)
{
struct str_map *aliases = get_aliases_config (ctx);
for (size_t i = 0; i < N_ELEMENTS (g_default_aliases); i++)
{
const char **pair = g_default_aliases[i];
str_map_set (aliases, pair[0], config_item_string_from_cstr (pair[1]));
}
}
static void
load_configuration (struct app_context *ctx)
{
// In theory, we could ensure that only one instance is running by locking
// the configuration file and ensuring here that it exists. This is
// however brittle, as it may be unlinked without the application noticing.
struct config_item *root = NULL;
struct error *e = NULL;
char *filename = resolve_filename
(PROGRAM_NAME ".conf", resolve_relative_config_filename);
if (filename)
root = config_read_from_file (filename, &e);
else
log_global_error (ctx, "Configuration file not found");
free (filename);
if (e)
{
log_global_error (ctx, "Cannot load configuration: #s", e->message);
log_global_error (ctx,
"Please either fix the configuration file or remove it");
error_free (e);
exit (EXIT_FAILURE);
}
if (root)
{
config_load (&ctx->config, root);
log_global_status (ctx, "Configuration loaded");
}
else
{
show_first_time_help (ctx);
load_default_aliases (ctx);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
load_servers (struct app_context *ctx)
{
struct str_map_iter iter = str_map_iter_make (get_servers_config (ctx));
struct config_item *subtree;
while ((subtree = str_map_iter_next (&iter)))
{
const char *name = iter.link->key;
const char *err;
if (subtree->type != CONFIG_ITEM_OBJECT)
log_global_error (ctx, "Error in configuration: "
"ignoring server `#s' as it's not an object", name);
else if ((err = check_server_name_for_addition (ctx, name)))
log_global_error (ctx, "Cannot load server `#s': #s", name, err);
else
server_add (ctx, name, subtree);
}
}
// --- Signals -----------------------------------------------------------------
static int g_signal_pipe[2]; ///< A pipe used to signal... signals
/// Program termination has been requested by a signal
static volatile sig_atomic_t g_termination_requested;
/// The window has changed in size
static volatile sig_atomic_t g_winch_received;
static void
postpone_signal_handling (char id)
{
int original_errno = errno;
if (write (g_signal_pipe[1], &id, 1) == -1)
soft_assert (errno == EAGAIN);
errno = original_errno;
}
static void
signal_superhandler (int signum)
{
switch (signum)
{
case SIGWINCH:
g_winch_received = true;
postpone_signal_handling ('w');
break;
case SIGINT:
case SIGTERM:
g_termination_requested = true;
postpone_signal_handling ('t');
break;
case SIGCHLD:
postpone_signal_handling ('c');
break;
case SIGTSTP:
postpone_signal_handling ('s');
break;
default:
hard_assert (!"unhandled signal");
}
}
static void
setup_signal_handlers (void)
{
if (pipe (g_signal_pipe) == -1)
exit_fatal ("%s: %s", "pipe", strerror (errno));
set_cloexec (g_signal_pipe[0]);
set_cloexec (g_signal_pipe[1]);
// So that the pipe cannot overflow; it would make write() block within
// the signal handler, which is something we really don't want to happen.
// The same holds true for read().
set_blocking (g_signal_pipe[0], false);
set_blocking (g_signal_pipe[1], false);
signal (SIGPIPE, SIG_IGN);
// So that we can write to the terminal while we're running a pager.
// This is also inherited by the child so that it doesn't stop
// when it calls tcsetpgrp().
signal (SIGTTOU, SIG_IGN);
struct sigaction sa;
sa.sa_flags = SA_RESTART;
sa.sa_handler = signal_superhandler;
sigemptyset (&sa.sa_mask);
if (sigaction (SIGWINCH, &sa, NULL) == -1
|| sigaction (SIGINT, &sa, NULL) == -1
|| sigaction (SIGTERM, &sa, NULL) == -1
|| sigaction (SIGTSTP, &sa, NULL) == -1
|| sigaction (SIGCHLD, &sa, NULL) == -1)
exit_fatal ("sigaction: %s", strerror (errno));
}
// --- I/O event handlers ------------------------------------------------------
static bool
try_reap_child (struct app_context *ctx)
{
int status;
pid_t zombie = waitpid (-1, &status, WNOHANG | WUNTRACED);
if (zombie == -1)
{
if (errno == ECHILD) return false;
if (errno == EINTR) return true;
exit_fatal ("%s: %s", "waitpid", strerror (errno));
}
if (!zombie)
return false;
if (WIFSTOPPED (status))
{
// We could also send SIGCONT but what's the point
log_global_debug (ctx,
"A child has been stopped, killing its process group");
kill (-zombie, SIGKILL);
return true;
}
if (ctx->running_pager)
ctx->running_pager = false;
else if (!ctx->running_editor)
{
log_global_debug (ctx, "An unknown child has died");
return true;
}
hard_assert (tcsetpgrp (STDOUT_FILENO, getpgid (0)) != -1);
resume_terminal (ctx);
if (WIFSIGNALED (status))
log_global_error (ctx,
"Child died from signal #d", WTERMSIG (status));
else if (WIFEXITED (status) && WEXITSTATUS (status) != 0)
log_global_error (ctx,
"Child returned status #d", WEXITSTATUS (status));
else if (ctx->running_editor)
input_editor_process (ctx);
if (ctx->running_editor)
input_editor_cleanup (ctx);
return true;
}
static void
on_signal_pipe_readable (const struct pollfd *fd, struct app_context *ctx)
{
char id = 0;
(void) read (fd->fd, &id, 1);
// Stop ourselves cleanly, even if it makes little sense to do this
if (id == 's')
{
suspend_terminal (ctx);
kill (getpid (), SIGSTOP);
g_winch_received = true;
resume_terminal (ctx);
}
// Reap all dead children (since the signal pipe may overflow etc. we run
// waitpid() in a loop to return all the zombies it knows about).
while (try_reap_child (ctx))
;
if (g_termination_requested)
{
g_termination_requested = false;
request_quit (ctx, NULL);
}
if (g_winch_received)
{
g_winch_received = false;
redraw_screen (ctx);
}
}
static void
process_formatting_escape (const struct pollfd *fd, struct app_context *ctx)
{
// There's no other way with libedit, as both el_getc() in a function
// handler and CC_ARGHACK would block execution
struct str *buf = &ctx->input_buffer;
str_reserve (buf, 1);
if (read (fd->fd, buf->str + buf->len, 1) != 1)
goto error;
buf->str[++buf->len] = '\0';
// XXX: I think this should be global and shared with Readline/libedit
mbstate_t state;
memset (&state, 0, sizeof state);
size_t len = mbrlen (buf->str, buf->len, &state);
// Illegal sequence
if (len == (size_t) -1)
goto error;
// Incomplete multibyte character
if (len == (size_t) -2)
return;
if (buf->len != 1)
goto error;
switch (buf->str[0])
{
case 'b' ^ 96:
case 'b': CALL_ (ctx->input, insert, "\x02"); break;
case 'c': CALL_ (ctx->input, insert, "\x03"); break;
case 'i' ^ 96:
case 'i':
case ']': CALL_ (ctx->input, insert, "\x1d"); break;
case 'x' ^ 96:
case 'x':
case '^': CALL_ (ctx->input, insert, "\x1e"); break;
case 'u' ^ 96:
case 'u':
case '_': CALL_ (ctx->input, insert, "\x1f"); break;
case 'v': CALL_ (ctx->input, insert, "\x16"); break;
case 'o': CALL_ (ctx->input, insert, "\x0f"); break;
default:
goto error;
}
goto done;
error:
CALL (ctx->input, ding);
done:
str_reset (buf);
ctx->awaiting_formatting_escape = false;
}
#define BRACKETED_PASTE_LIMIT 102400 ///< How much text can be pasted
static bool
insert_paste (struct app_context *ctx, char *paste, size_t len)
{
if (!get_config_boolean (ctx->config.root, "general.process_pasted_text"))
return CALL_ (ctx->input, insert, paste);
// Without ICRNL, which Editline keeps but Readline doesn't,
// the terminal sends newlines as carriage returns (seen on urxvt)
for (size_t i = 0; i < len; i++)
if (paste[i] == '\r')
paste[i] = '\n';
int position = 0;
char *input = CALL_ (ctx->input, get_line, &position);
bool quote_first_slash = !position || strchr ("\r\n", input[position - 1]);
free (input);
// Executing commands by accident is much more common than pasting them
// intentionally, although the latter may also have security consequences
struct str processed = str_make ();
str_reserve (&processed, len);
for (size_t i = 0; i < len; i++)
{
if (paste[i] == '/'
&& ((!i && quote_first_slash) || (i && paste[i - 1] == '\n')))
str_append_c (&processed, paste[i]);
str_append_c (&processed, paste[i]);
}
bool success = CALL_ (ctx->input, insert, processed.str);
str_free (&processed);
return success;
}
static void
process_bracketed_paste (const struct pollfd *fd, struct app_context *ctx)
{
struct str *buf = &ctx->input_buffer;
str_reserve (buf, 1);
if (read (fd->fd, buf->str + buf->len, 1) != 1)
goto error;
buf->str[++buf->len] = '\0';
static const char stop_mark[] = "\x1b[201~";
static const size_t stop_mark_len = sizeof stop_mark - 1;
if (buf->len < stop_mark_len)
return;
size_t text_len = buf->len - stop_mark_len;
if (memcmp (buf->str + text_len, stop_mark, stop_mark_len))
return;
// Avoid endless flooding of the buffer
if (text_len > BRACKETED_PASTE_LIMIT)
log_global_error (ctx, "Paste trimmed to #d bytes",
(int) (text_len = BRACKETED_PASTE_LIMIT));
buf->str[text_len] = '\0';
if (insert_paste (ctx, buf->str, text_len))
goto done;
error:
CALL (ctx->input, ding);
log_global_error (ctx, "Paste failed");
done:
str_reset (buf);
ctx->in_bracketed_paste = false;
}
static void
reset_autoaway (struct app_context *ctx)
{
// Stop the last one if it's been disabled altogether in the meantime
poller_timer_reset (&ctx->autoaway_tmr);
// Unset any automated statuses that are active right at this moment
struct str_map_iter iter = str_map_iter_make (&ctx->servers);
struct server *s;
while ((s = str_map_iter_next (&iter)))
{
if (s->autoaway_active
&& s->irc_user
&& s->irc_user->away)
irc_send (s, "AWAY");
s->autoaway_active = false;
}
// And potentially start a new auto-away timer
int64_t delay = get_config_integer
(ctx->config.root, "general.autoaway_delay");
if (delay)
poller_timer_set (&ctx->autoaway_tmr, delay * 1000);
}
static void
on_autoaway_timer (struct app_context *ctx)
{
// An empty message would unset any away status, so let's ignore that
const char *message = get_config_string
(ctx->config.root, "general.autoaway_message");
if (!message || !*message)
return;
struct str_map_iter iter = str_map_iter_make (&ctx->servers);
struct server *s;
while ((s = str_map_iter_next (&iter)))
{
// If the user has already been marked as away,
// don't override his current away status
if (s->irc_user
&& s->irc_user->away)
continue;
irc_send (s, "AWAY :%s", message);
s->autoaway_active = true;
}
}
static void
on_tty_readable (const struct pollfd *fd, struct app_context *ctx)
{
if (fd->revents & ~(POLLIN | POLLHUP | POLLERR))
print_debug ("fd %d: unexpected revents: %d", fd->fd, fd->revents);
if (ctx->awaiting_formatting_escape)
process_formatting_escape (fd, ctx);
else if (ctx->in_bracketed_paste)
process_bracketed_paste (fd, ctx);
else if (!ctx->quitting)
CALL (ctx->input, on_tty_readable);
// User activity detected, stop current auto-away and start anew;
// since they might have just changed the settings, do this last
reset_autoaway (ctx);
}
static void
rearm_flush_timer (struct app_context *ctx)
{
poller_timer_set (&ctx->flush_timer, 60 * 1000);
}
static void
on_flush_timer (struct app_context *ctx)
{
// I guess we don't need to do anything more complicated
fflush (NULL);
// It would be a bit problematic to handle it properly, so do this at least
LIST_FOR_EACH (struct buffer, buffer, ctx->buffers)
{
if (!buffer->log_file || !ferror (buffer->log_file))
continue;
// Might be a transient error such as running out of disk space,
// keep notifying of the problem until it disappears
clearerr (buffer->log_file);
log_global (ctx, BUFFER_LINE_SKIP_FILE, BUFFER_LINE_ERROR,
"Log write failure detected for #s", buffer->name);
}
#ifdef LOMEM
// Lua should normally be reasonable and collect garbage when needed,
// though we can try to push it. This is a reasonable place.
LIST_FOR_EACH (struct plugin, iter, ctx->plugins)
if (iter->vtable->gc)
iter->vtable->gc (iter);
#endif // LOMEM
rearm_flush_timer (ctx);
}
static void
rearm_date_change_timer (struct app_context *ctx)
{
struct tm tm_;
const time_t now = time (NULL);
if (!soft_assert (localtime_r (&now, &tm_)))
return;
tm_.tm_sec = tm_.tm_min = tm_.tm_hour = 0;
tm_.tm_mday++;
tm_.tm_isdst = -1;
const time_t midnight = mktime (&tm_);
if (!soft_assert (midnight != (time_t) -1))
return;
poller_timer_set (&ctx->date_chg_tmr, (midnight - now) * 1000);
}
static void
on_date_change_timer (struct app_context *ctx)
{
if (ctx->terminal_suspended <= 0)
{
CALL (ctx->input, hide);
buffer_update_time (ctx, time (NULL), stdout, 0);
CALL (ctx->input, show);
}
rearm_date_change_timer (ctx);
}
static void
on_pending_input (struct app_context *ctx)
{
poller_idle_reset (&ctx->input_event);
for (size_t i = 0; i < ctx->pending_input.len; i++)
{
char *input = iconv_xstrdup
(ctx->term_to_utf8, ctx->pending_input.vector[i], -1, NULL);
if (input)
process_input (ctx, ctx->current_buffer, input);
else
print_error ("character conversion failed for: %s", "user input");
free (input);
}
strv_reset (&ctx->pending_input);
}
static void
init_poller_events (struct app_context *ctx)
{
ctx->signal_event = poller_fd_make (&ctx->poller, g_signal_pipe[0]);
ctx->signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable;
ctx->signal_event.user_data = ctx;
poller_fd_set (&ctx->signal_event, POLLIN);
ctx->tty_event = poller_fd_make (&ctx->poller, STDIN_FILENO);
ctx->tty_event.dispatcher = (poller_fd_fn) on_tty_readable;
ctx->tty_event.user_data = ctx;
poller_fd_set (&ctx->tty_event, POLLIN);
ctx->flush_timer = poller_timer_make (&ctx->poller);
ctx->flush_timer.dispatcher = (poller_timer_fn) on_flush_timer;
ctx->flush_timer.user_data = ctx;
rearm_flush_timer (ctx);
ctx->date_chg_tmr = poller_timer_make (&ctx->poller);
ctx->date_chg_tmr.dispatcher = (poller_timer_fn) on_date_change_timer;
ctx->date_chg_tmr.user_data = ctx;
rearm_date_change_timer (ctx);
ctx->autoaway_tmr = poller_timer_make (&ctx->poller);
ctx->autoaway_tmr.dispatcher = (poller_timer_fn) on_autoaway_timer;
ctx->autoaway_tmr.user_data = ctx;
ctx->prompt_event = poller_idle_make (&ctx->poller);
ctx->prompt_event.dispatcher = (poller_idle_fn) on_refresh_prompt;
ctx->prompt_event.user_data = ctx;
ctx->input_event = poller_idle_make (&ctx->poller);
ctx->input_event.dispatcher = (poller_idle_fn) on_pending_input;
ctx->input_event.user_data = ctx;
}
// --- Relay processing --------------------------------------------------------
// XXX: This could be below completion code if reset_autoaway() was higher up.
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
client_resync (struct client *c)
{
struct str_map_iter iter = str_map_iter_make (&c->ctx->servers);
struct server *s;
while ((s = str_map_iter_next (&iter)))
{
relay_prepare_server_update (c->ctx, s);
relay_send (c);
}
LIST_FOR_EACH (struct buffer, buffer, c->ctx->buffers)
{
relay_prepare_buffer_update (c->ctx, buffer);
relay_send (c);
relay_prepare_buffer_stats (c->ctx, buffer);
relay_send (c);
LIST_FOR_EACH (struct buffer_line, line, buffer->lines)
{
relay_prepare_buffer_line (c->ctx, buffer, line, false);
relay_send (c);
}
}
relay_prepare_buffer_activate (c->ctx, c->ctx->current_buffer);
relay_send (c);
}
static const char *
client_message_buffer_name (const struct relay_command_message *m)
{
switch (m->data.command)
{
case RELAY_COMMAND_BUFFER_COMPLETE:
return m->data.buffer_input.buffer_name.str;
case RELAY_COMMAND_BUFFER_ACTIVATE:
return m->data.buffer_activate.buffer_name.str;
case RELAY_COMMAND_BUFFER_INPUT:
return m->data.buffer_input.buffer_name.str;
case RELAY_COMMAND_BUFFER_TOGGLE_UNIMPORTANT:
return m->data.buffer_toggle_unimportant.buffer_name.str;
case RELAY_COMMAND_BUFFER_LOG:
return m->data.buffer_log.buffer_name.str;
default:
return NULL;
}
}
static void
client_process_buffer_complete (struct client *c, uint32_t seq,
struct buffer *buffer, struct relay_command_data_buffer_complete *req)
{
struct str *line = &req->text;
uint32_t end = req->position;
if (line->len < end || line->len != strlen (line->str))
{
relay_prepare_error (c->ctx, seq, "Invalid arguments");
goto out;
}
uint32_t start = end;
while (start && !strchr (WORD_BREAKING_CHARS, line->str[start - 1]))
start--;
struct strv completions =
make_completions (c->ctx, buffer, line->str, start, end);
if (completions.len > UINT32_MAX)
{
relay_prepare_error (c->ctx, seq, "Internal error");
goto out_internal;
}
struct relay_event_data_response *e = relay_prepare_response (c->ctx, seq);
e->data.command = RELAY_COMMAND_BUFFER_COMPLETE;
struct relay_response_data_buffer_complete *resp =
&e->data.buffer_complete;
resp->start = start;
resp->completions_len = completions.len;
resp->completions = xcalloc (completions.len, sizeof *resp->completions);
for (size_t i = 0; i < completions.len; i++)
resp->completions[i] = str_from_cstr (completions.vector[i]);
out_internal:
strv_free (&completions);
out:
relay_send (c);
}
static void
client_process_buffer_log
(struct client *c, uint32_t seq, struct buffer *buffer)
{
struct relay_event_data_response *e = relay_prepare_response (c->ctx, seq);
e->data.command = RELAY_COMMAND_BUFFER_LOG;
char *path = buffer_get_log_path (buffer);
FILE *fp = open_log_path (c->ctx, buffer, path);
if (fp)
{
struct str log = str_make ();
char buf[BUFSIZ];
size_t len;
while ((len = fread (buf, 1, sizeof buf, fp)))
str_append_data (&log, buf, len);
if (ferror (fp))
log_global_error (c->ctx, "Failed to read `#l': #l",
path, strerror (errno));
// On overflow, it will later fail serialization.
e->data.buffer_log.log_len = MIN (UINT32_MAX, log.len);
e->data.buffer_log.log = (uint8_t *) str_steal (&log);
fclose (fp);
}
// XXX: We log failures to the global buffer,
// so the client just receives nothing if there is no log file.
free (path);
relay_send (c);
}
static bool
client_process_message (struct client *c,
struct msg_unpacker *r, struct relay_command_message *m)
{
if (!relay_command_message_deserialize (m, r)
|| msg_unpacker_get_available (r))
{
log_global_error (c->ctx, "Deserialization failed, killing client");
return false;
}
const char *buffer_name = client_message_buffer_name (m);
struct buffer *buffer = NULL;
if (buffer_name && !(buffer = buffer_by_name (c->ctx, buffer_name)))
{
relay_prepare_error (c->ctx, m->command_seq, "Unknown buffer");
relay_send (c);
return true;
}
switch (m->data.command)
{
case RELAY_COMMAND_HELLO:
if (m->data.hello.version != RELAY_VERSION)
{
// TODO: This should send back an error message and shut down.
log_global_error (c->ctx,
"Protocol version mismatch, killing client");
return false;
}
c->initialized = true;
client_resync (c);
break;
case RELAY_COMMAND_PING:
relay_prepare_response (c->ctx, m->command_seq)
->data.command = RELAY_COMMAND_PING;
relay_send (c);
break;
case RELAY_COMMAND_ACTIVE:
reset_autoaway (c->ctx);
break;
case RELAY_COMMAND_BUFFER_COMPLETE:
client_process_buffer_complete (c, m->command_seq, buffer,
&m->data.buffer_complete);
break;
case RELAY_COMMAND_BUFFER_ACTIVATE:
buffer_activate (c->ctx, buffer);
break;
case RELAY_COMMAND_BUFFER_INPUT:
process_input (c->ctx, buffer, m->data.buffer_input.text.str);
break;
case RELAY_COMMAND_BUFFER_TOGGLE_UNIMPORTANT:
buffer_toggle_unimportant (c->ctx, buffer);
break;
case RELAY_COMMAND_BUFFER_LOG:
client_process_buffer_log (c, m->command_seq, buffer);
break;
default:
log_global_debug (c->ctx, "Unhandled client command");
relay_prepare_error (c->ctx, m->command_seq, "Unknown command");
relay_send (c);
}
return true;
}
static bool
client_process_buffer (struct client *c)
{
struct str *buf = &c->read_buffer;
size_t offset = 0;
while (true)
{
uint32_t frame_len = 0;
struct msg_unpacker r =
msg_unpacker_make (buf->str + offset, buf->len - offset);
if (!msg_unpacker_u32 (&r, &frame_len))
break;
r.len = MIN (r.len, sizeof frame_len + frame_len);
if (msg_unpacker_get_available (&r) < frame_len)
break;
struct relay_command_message m = {};
bool ok = client_process_message (c, &r, &m);
relay_command_message_free (&m);
if (!ok)
return false;
offset += r.offset;
}
str_remove_slice (buf, 0, offset);
return true;
}
// --- Relay plumbing ----------------------------------------------------------
static bool
client_try_read (struct client *c)
{
struct str *buf = &c->read_buffer;
ssize_t n_read;
while ((n_read = read (c->socket_fd, buf->str + buf->len,
buf->alloc - buf->len - 1 /* null byte */)) > 0)
{
buf->len += n_read;
if (!client_process_buffer (c))
break;
str_reserve (buf, 512);
}
if (n_read < 0)
{
if (errno == EAGAIN || errno == EINTR)
return true;
log_global_debug (c->ctx,
"#s: #s: #l", __func__, "read", strerror (errno));
}
client_kill (c);
return false;
}
static bool
client_try_write (struct client *c)
{
struct str *buf = &c->write_buffer;
ssize_t n_written;
while (buf->len)
{
n_written = write (c->socket_fd, buf->str, buf->len);
if (n_written >= 0)
{
str_remove_slice (buf, 0, n_written);
continue;
}
if (errno == EAGAIN || errno == EINTR)
return true;
log_global_debug (c->ctx,
"#s: #s: #l", __func__, "write", strerror (errno));
client_kill (c);
return false;
}
return true;
}
static void
on_client_ready (const struct pollfd *pfd, void *user_data)
{
struct client *c = user_data;
if (client_try_read (c) && client_try_write (c))
client_update_poller (c, pfd);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
relay_try_fetch_client (struct app_context *ctx, int listen_fd)
{
// XXX: `struct sockaddr_storage' is not the most portable thing
struct sockaddr_storage peer;
socklen_t peer_len = sizeof peer;
int fd = accept (listen_fd, (struct sockaddr *) &peer, &peer_len);
if (fd == -1)
{
if (errno == EAGAIN || errno == EWOULDBLOCK)
return false;
if (errno == EINTR)
return true;
if (accept_error_is_transient (errno))
{
log_global_debug (ctx, "#s: #l", "accept", strerror (errno));
return true;
}
log_global_error (ctx, "#s: #l", "accept", strerror (errno));
app_context_relay_stop (ctx);
return false;
}
hard_assert (peer_len <= sizeof peer);
set_blocking (fd, false);
set_cloexec (fd);
// We already buffer our output, so reduce latencies.
int yes = 1;
soft_assert (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY,
&yes, sizeof yes) != -1);
struct client *c = client_new ();
c->ctx = ctx;
c->socket_fd = fd;
LIST_PREPEND (ctx->clients, c);
c->socket_event = poller_fd_make (&c->ctx->poller, c->socket_fd);
c->socket_event.dispatcher = (poller_fd_fn) on_client_ready;
c->socket_event.user_data = c;
client_update_poller (c, NULL);
return true;
}
static void
on_relay_client_available (const struct pollfd *pfd, void *user_data)
{
struct app_context *ctx = user_data;
while (relay_try_fetch_client (ctx, pfd->fd))
;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
relay_listen (struct addrinfo *ai, struct error **e)
{
int fd = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (fd == -1)
{
error_set (e, "socket: %s", strerror (errno));
return -1;
}
set_cloexec (fd);
int yes = 1;
soft_assert (setsockopt (fd, SOL_SOCKET, SO_KEEPALIVE,
&yes, sizeof yes) != -1);
soft_assert (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
&yes, sizeof yes) != -1);
if (bind (fd, ai->ai_addr, ai->ai_addrlen))
error_set (e, "bind: %s", strerror (errno));
else if (listen (fd, 16 /* arbitrary number */))
error_set (e, "listen: %s", strerror (errno));
else
return fd;
xclose (fd);
return -1;
}
static int
relay_listen_with_context (struct app_context *ctx, struct addrinfo *ai,
struct error **e)
{
char *address = gai_reconstruct_address (ai);
log_global_debug (ctx, "binding to `#l'", address);
struct error *error = NULL;
int fd = relay_listen (ai, &error);
if (fd == -1)
{
error_set (e, "binding to `%s' failed: %s", address, error->message);
error_free (error);
}
free (address);
return fd;
}
static bool
relay_start (struct app_context *ctx, char *address, struct error **e)
{
const char *port = NULL, *host = tokenize_host_port (address, &port);
if (!port || !*port)
return error_set (e, "missing port");
struct addrinfo hints = {}, *result = NULL;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
int err = getaddrinfo (*host ? host : NULL, port, &hints, &result);
if (err)
{
return error_set (e, "failed to resolve `%s', port `%s': %s: %s",
host, port, "getaddrinfo", gai_strerror (err));
}
// Just try the first one, disregarding IPv4/IPv6 ordering.
int fd = relay_listen_with_context (ctx, result, e);
freeaddrinfo (result);
if (fd == -1)
return false;
set_blocking (fd, false);
struct poller_fd *event = &ctx->relay_event;
*event = poller_fd_make (&ctx->poller, fd);
event->dispatcher = (poller_fd_fn) on_relay_client_available;
event->user_data = ctx;
ctx->relay_fd = fd;
poller_fd_set (event, POLLIN);
return true;
}
static void
on_config_relay_bind_change (struct config_item *item)
{
struct app_context *ctx = item->user_data;
char *value = item->value.string.str;
app_context_relay_stop (ctx);
if (!value)
return;
// XXX: This should perhaps be reencoded as the locale encoding.
char *address = xstrdup (value);
struct error *e = NULL;
if (!relay_start (ctx, address, &e))
{
log_global_error (ctx, "#s: #l", item->schema->name, e->message);
error_free (e);
}
free (address);
}
// --- Tests -------------------------------------------------------------------
// The application is quite monolithic and can only be partially unit-tested.
// Locale-, terminal- and filesystem-dependent tests are also somewhat tricky.
#ifdef TESTING
static struct config_schema g_config_test[] =
{
{ .name = "foo", .type = CONFIG_ITEM_BOOLEAN, .default_ = "off" },
{ .name = "bar", .type = CONFIG_ITEM_INTEGER, .default_ = "1" },
{ .name = "foobar", .type = CONFIG_ITEM_STRING, .default_ = "\"x\\x01\"" },
{}
};
static void
test_config (void)
{
struct config_item *foo = config_item_object ();
config_schema_apply_to_object (g_config_test, foo, NULL);
struct config_item *root = config_item_object ();
str_map_set (&root->value.object, "top", foo);
struct strv v = strv_make ();
dump_matching_options (root, "*foo*", &v);
hard_assert (v.len == 2);
hard_assert (!strcmp (v.vector[0], "top.foo = off"));
hard_assert (!strcmp (v.vector[1], "top.foobar = \"x\\x01\""));
strv_free (&v);
config_item_destroy (root);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
test_aliases (void)
{
struct strv v = strv_make ();
expand_alias_definition ("/foo; /bar $* $$$;;;$1$2$3$4", "foo bar baz", &v);
hard_assert (v.len == 4);
hard_assert (!strcmp (v.vector[0], "/foo"));
hard_assert (!strcmp (v.vector[1], " /bar foo bar baz $;"));
hard_assert (!strcmp (v.vector[2], ""));
hard_assert (!strcmp (v.vector[3], "foobarbaz"));
strv_free (&v);
}
static void
test_wrapping (void)
{
static const char *message = " foo bar foobar fóóbárbáz\002 a\0031 b";
// XXX: formatting continuation order is implementation-dependent here
// (irc_serialize_char_attrs() makes a choice in serialization)
static const char *split[] = { " foo", "bar", "foob", "ar",
"fó", "ób", "árb", "áz\x02", "\002a\0031", "\0031\002b" };
struct strv v = strv_make ();
hard_assert (wrap_message (message, 4, &v, NULL));
hard_assert (v.len == N_ELEMENTS (split));
for (size_t i = 0; i < N_ELEMENTS (split); i++)
hard_assert (!strcmp (v.vector[i], split[i]));
strv_free (&v);
}
static void
test_utf8 (void)
{
static const char *a[] = { "fřoo", "Fřooř", "fřOOŘ" };
hard_assert (utf8_common_prefix (a, N_ELEMENTS (a)) == 5);
char *cut_off = xstrdup ("ё\xD0");
irc_sanitize_cut_off_utf8 (&cut_off);
hard_assert (!strcmp (cut_off, "ё\xEF\xBF\xBD"));
free (cut_off);
}
int
main (int argc, char *argv[])
{
struct test test;
test_init (&test, argc, argv);
test_add_simple (&test, "/config", NULL, test_config);
test_add_simple (&test, "/aliases", NULL, test_aliases);
test_add_simple (&test, "/wrapping", NULL, test_wrapping);
test_add_simple (&test, "/utf8", NULL, test_utf8);
return test_run (&test);
}
#define main main_shadowed
#endif // TESTING
// --- Main program ------------------------------------------------------------
static const char *g_logo[] =
{
"",
"\x02" PROGRAM_NAME "\x02 " PROGRAM_VERSION,
"",
};
static void
show_logo (struct app_context *ctx)
{
for (size_t i = 0; i < N_ELEMENTS (g_logo); i++)
log_global_indent (ctx, "#m", g_logo[i]);
}
static void
format_input_and_die (struct app_context *ctx)
{
char buf[513];
while (fgets (buf, sizeof buf, stdin))
{
struct formatter f = formatter_make (ctx, NULL);
formatter_add (&f, "#m", buf);
formatter_flush (&f, stdout, FLUSH_OPT_NOWRAP);
formatter_free (&f);
}
exit (EXIT_SUCCESS);
}
int
main (int argc, char *argv[])
{
// We include a generated file from xD including this array we don't use;
// let's just keep it there and silence the compiler warning instead
(void) g_default_replies;
static const struct opt opts[] =
{
{ 'h', "help", NULL, 0, "display this help and exit" },
{ 'V', "version", NULL, 0, "output version information and exit" },
// This is mostly intended for previewing formatted MOTD files
{ 'f', "format", NULL, OPT_LONG_ONLY, "format IRC text from stdin" },
{ 0, NULL, NULL, 0, NULL }
};
struct opt_handler oh =
opt_handler_make (argc, argv, opts, NULL, "Terminal-based IRC client.");
bool format_mode = false;
int c;
while ((c = opt_handler_get (&oh)) != -1)
switch (c)
{
case 'h':
opt_handler_usage (&oh, stdout);
exit (EXIT_SUCCESS);
case 'V':
printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
exit (EXIT_SUCCESS);
case 'f':
format_mode = true;
break;
default:
print_error ("wrong options");
opt_handler_usage (&oh, stderr);
exit (EXIT_FAILURE);
}
if (optind != argc)
{
opt_handler_usage (&oh, stderr);
exit (EXIT_FAILURE);
}
opt_handler_free (&oh);
// We only need to convert to and from the terminal encoding
setlocale (LC_CTYPE, "");
struct app_context ctx;
app_context_init (&ctx);
g_ctx = &ctx;
init_openssl ();
// Bootstrap configuration, so that we can access schema items at all
register_config_modules (&ctx);
config_load (&ctx.config, config_item_object ());
// The following part is a bit brittle because of interdependencies
init_colors (&ctx);
if (format_mode) format_input_and_die (&ctx);
init_global_buffer (&ctx);
show_logo (&ctx);
setup_signal_handlers ();
init_poller_events (&ctx);
load_configuration (&ctx);
// At this moment we can safely call any "on_change" callbacks
config_schema_call_changed (ctx.config.root);
// Initialize input so that we can switch to new buffers
on_refresh_prompt (&ctx);
ctx.input->add_functions = input_add_functions;
CALL_ (ctx.input, start, argv[0]);
toggle_bracketed_paste (true);
reset_autoaway (&ctx);
// Finally, we juice the configuration for some servers to create
load_plugins (&ctx);
load_servers (&ctx);
ctx.polling = true;
while (ctx.polling)
poller_run (&ctx.poller);
CALL (ctx.input, stop);
app_context_free (&ctx);
toggle_bracketed_paste (false);
free_terminal ();
return EXIT_SUCCESS;
}
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