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xK/degesch.c

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/*
* degesch.c: the experimental IRC client
*
* Copyright (c) 2015, Přemysl Janouch <p.janouch@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* 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.
*
*/
/// Some arbitrary limit for the history file
#define HISTORY_LIMIT 10000
// A table of all attributes we use for output
#define ATTR_TABLE(XX) \
XX( PROMPT, "prompt", "Terminal attributes for the prompt" ) \
XX( RESET, "reset", "String to reset terminal attributes" ) \
XX( WARNING, "warning", "Terminal attributes for warnings" ) \
XX( ERROR, "error", "Terminal attributes for errors" ) \
XX( EXTERNAL, "external", "Terminal attributes for external lines" ) \
XX( TIMESTAMP, "timestamp", "Terminal attributes for timestamps" ) \
XX( HIGHLIGHT, "highlight", "Terminal attributes for highlights" ) \
XX( ACTION, "action", "Terminal attributes for user actions" ) \
XX( JOIN, "join", "Terminal attributes for joins" ) \
XX( PART, "part", "Terminal attributes for parts" )
enum
{
#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 "degesch"
#include "common.c"
#include "kike-replies.c"
#include <langinfo.h>
#include <locale.h>
#include <pwd.h>
#include <sys/utsname.h>
#include <curses.h>
#include <term.h>
// Literally cancer
#undef lines
#undef columns
#include <readline/readline.h>
#include <readline/history.h>
// --- Configuration (application-specific) ------------------------------------
// TODO: reject all junk present in the configuration; there can be newlines
static struct config_item g_config_table[] =
{
{ "nickname", NULL, "IRC nickname" },
{ "username", NULL, "IRC user name" },
{ "realname", NULL, "IRC real name/e-mail" },
{ "irc_host", NULL, "Address of the IRC server" },
{ "irc_port", "6667", "Port of the IRC server" },
{ "ssl", "off", "Whether to use SSL" },
{ "ssl_cert", NULL, "Client SSL certificate (PEM)" },
{ "ssl_verify", "on", "Whether to verify certificates" },
{ "ssl_ca_file", NULL, "OpenSSL CA bundle file" },
{ "ssl_ca_path", NULL, "OpenSSL CA bundle path" },
{ "autojoin", NULL, "Channels to join on start" },
{ "reconnect", "on", "Whether to reconnect on error" },
{ "reconnect_delay", "5", "Time between reconnecting" },
{ "socks_host", NULL, "Address of a SOCKS 4a/5 proxy" },
{ "socks_port", "1080", "SOCKS port number" },
{ "socks_username", NULL, "SOCKS auth. username" },
{ "socks_password", NULL, "SOCKS auth. password" },
{ "isolate_buffers", "off", "Isolate global/server buffers" },
#define XX(x, y, z) { "attr_" y, NULL, z },
ATTR_TABLE (XX)
#undef XX
{ NULL, NULL, NULL }
};
// --- Application data --------------------------------------------------------
// All text stored in our data structures is encoded in UTF-8.
// Or at least should be. The exception is IRC identifiers.
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// We need a few reference countable objects with support
// for both strong and weak references
/// Callback just before a reference counted object is destroyed
typedef void (*destroy_cb_fn) (void *object, void *user_data);
#define REF_COUNTABLE_HEADER \
size_t ref_count; /**< Reference count */ \
destroy_cb_fn on_destroy; /**< To remove any weak references */ \
void *user_data; /**< User data for callbacks */
#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; \
if (self->on_destroy) \
self->on_destroy (self, self->user_data); \
name ## _destroy (self); \
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct user_channel
{
LIST_HEADER (struct user_channel)
struct channel *channel; ///< Reference to channel
};
static struct user_channel *
user_channel_new (void)
{
struct user_channel *self = xcalloc (1, sizeof *self);
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
// TODO: eventually a reference to the server
char *nickname; ///< Literal nickname
// TODO: write code to poll for the away status
bool away; ///< User is away
struct user_channel *channels; ///< Channels the user is on
};
static struct user *
user_new (void)
{
struct user *self = xcalloc (1, sizeof *self);
self->ref_count = 1;
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 *modes; ///< Op/voice/... characters
};
static struct channel_user *
channel_user_new (void)
{
struct channel_user *self = xcalloc (1, sizeof *self);
return self;
}
static void
channel_user_destroy (struct channel_user *self)
{
user_unref (self->user);
free (self->modes);
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// We keep references to channels in their buffers,
// and weak references in their users and the name lookup table.
// XXX: this doesn't really have to be reference countable
struct channel
{
REF_COUNTABLE_HEADER
// TODO: eventually a reference to the server
char *name; ///< Channel name
char *mode; ///< Channel mode
char *topic; ///< Channel topic
struct channel_user *users; ///< Channel users
struct str_vector names_buf; ///< Buffer for RPL_NAMREPLY
};
static struct channel *
channel_new (void)
{
struct channel *self = xcalloc (1, sizeof *self);
self->ref_count = 1;
str_vector_init (&self->names_buf);
return self;
}
static void
channel_destroy (struct channel *self)
{
free (self->name);
free (self->mode);
free (self->topic);
// Owner has to make sure we have no users by now
hard_assert (!self->users);
str_vector_free (&self->names_buf);
free (self);
}
REF_COUNTABLE_METHODS (channel)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
enum buffer_line_flags
{
BUFFER_LINE_HIGHLIGHT = 1 << 0 ///< The user was highlighted by this
};
enum buffer_line_type
{
BUFFER_LINE_PRIVMSG, ///< PRIVMSG
BUFFER_LINE_ACTION, ///< PRIVMSG ACTION
BUFFER_LINE_NOTICE, ///< NOTICE
BUFFER_LINE_JOIN, ///< JOIN
BUFFER_LINE_PART, ///< PART
BUFFER_LINE_KICK, ///< KICK
BUFFER_LINE_NICK, ///< NICK
BUFFER_LINE_TOPIC, ///< TOPIC
BUFFER_LINE_QUIT, ///< QUIT
BUFFER_LINE_STATUS, ///< Whatever status messages
BUFFER_LINE_ERROR ///< Whatever error messages
};
struct buffer_line_args
{
char *who; ///< Name of the origin or NULL (user)
char *object; ///< Object of action
char *text; ///< Text of message
char *reason; ///< Reason for PART, KICK, QUIT
};
struct buffer_line
{
LIST_HEADER (struct buffer_line)
// We use the "type" and "flags" mostly just as formatting hints
enum buffer_line_type type; ///< Type of the event
int flags; ///< Flags
time_t when; ///< Time of the event
struct buffer_line_args args; ///< Arguments
};
struct buffer_line *
buffer_line_new (void)
{
struct buffer_line *self = xcalloc (1, sizeof *self);
return self;
}
static void
buffer_line_destroy (struct buffer_line *self)
{
free (self->args.who);
free (self->args.object);
free (self->args.text);
free (self->args.reason);
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)
enum buffer_type type; ///< Type of the buffer
char *name; ///< The name of the buffer
// Readline state:
HISTORY_STATE *history; ///< Saved history state
char *saved_line; ///< Saved line
int saved_point; ///< Saved position in line
int saved_mark; ///< Saved mark
// 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 unseen_messages_count; ///< # messages since last visited
// Origin information:
struct server *server; ///< Reference to server
struct channel *channel; ///< Reference to channel
struct user *user; ///< Reference to user
};
static struct buffer *
buffer_new (void)
{
struct buffer *self = xcalloc (1, sizeof *self);
return self;
}
static void
buffer_destroy (struct buffer *self)
{
free (self->name);
// Can't really free "history" here
free (self->saved_line);
LIST_FOR_EACH (struct buffer_line, iter, self->lines)
buffer_line_destroy (iter);
if (self->user)
user_unref (self->user);
if (self->channel)
channel_unref (self->channel);
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct server
{
struct app_context *ctx; ///< Application context
int irc_fd; ///< Socket FD of the server
struct str read_buffer; ///< Input yet to be processed
struct poller_fd irc_event; ///< IRC FD event
bool irc_ready; ///< Whether we may send messages now
SSL_CTX *ssl_ctx; ///< SSL context
SSL *ssl; ///< SSL connection
// TODO: an output queue to prevent excess floods (this will be needed
// especially for away status polling)
// XXX: there can be buffers for non-existent users
// TODO: initialize key_strxfrm according to server properties;
// note that collisions may arise on reconnecting
// TODO: when disconnected, get rid of all users everywhere;
// maybe also broadcast all buffers about the disconnection event
// TODO: when getting connected again, rejoin all current channels
struct buffer *buffer; ///< The buffer for this server
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
char *irc_user_mode; ///< Our current user mode
char *irc_user_host; ///< Our current user@host
// 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
};
static void on_irc_ping_timeout (void *user_data);
static void on_irc_timeout (void *user_data);
static void on_irc_reconnect_timeout (void *user_data);
static void
server_init (struct server *self, struct poller *poller)
{
self->irc_fd = -1;
str_init (&self->read_buffer);
self->irc_ready = false;
str_map_init (&self->irc_users);
self->irc_users.key_xfrm = irc_strxfrm;
str_map_init (&self->irc_channels);
self->irc_channels.key_xfrm = irc_strxfrm;
str_map_init (&self->irc_buffer_map);
self->irc_buffer_map.key_xfrm = irc_strxfrm;
poller_timer_init (&self->timeout_tmr, poller);
self->timeout_tmr.dispatcher = on_irc_timeout;
self->timeout_tmr.user_data = self;
poller_timer_init (&self->ping_tmr, poller);
self->ping_tmr.dispatcher = on_irc_ping_timeout;
self->ping_tmr.user_data = self;
poller_timer_init (&self->reconnect_tmr, poller);
self->reconnect_tmr.dispatcher = on_irc_reconnect_timeout;
self->reconnect_tmr.user_data = self;
}
static void
server_free (struct server *self)
{
if (self->irc_fd != -1)
{
xclose (self->irc_fd);
poller_fd_reset (&self->irc_event);
}
str_free (&self->read_buffer);
if (self->ssl)
SSL_free (self->ssl);
if (self->ssl_ctx)
SSL_CTX_free (self->ssl_ctx);
if (self->irc_user)
user_unref (self->irc_user);
free (self->irc_user_mode);
free (self->irc_user_host);
str_map_free (&self->irc_users);
str_map_free (&self->irc_channels);
str_map_free (&self->irc_buffer_map);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct app_context
{
// Configuration:
struct str_map config; ///< User configuration
char *attrs[ATTR_COUNT]; ///< Terminal attributes
bool no_colors; ///< Colour output mode
bool reconnect; ///< Whether to reconnect on conn. fail.
unsigned long reconnect_delay; ///< Reconnect delay in seconds
bool isolate_buffers; ///< Isolate global/server buffers
struct server server; ///< Our only server so far
// Events:
struct poller_fd tty_event; ///< Terminal input event
struct poller_fd signal_event; ///< Signal FD event
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 *last_buffer; ///< Last used buffer
// XXX: when we go multiserver, there will be collisions
// TODO: make buffer names unique like weechat does
struct str_map buffers_by_name; ///< Excludes GLOBAL and SERVER
struct buffer *global_buffer; ///< The global buffer
struct buffer *current_buffer; ///< The current buffer
// TODO: So that we always output proper date change messages
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
iconv_t latin1_to_utf8; ///< ISO Latin 1 to UTF-8
int lines; ///< Current terminal height
int columns; ///< Current ternimal width
char *readline_prompt; ///< The prompt we use for readline
bool readline_prompt_shown; ///< Whether the prompt is shown now
}
*g_ctx;
static void
app_context_init (struct app_context *self)
{
memset (self, 0, sizeof *self);
str_map_init (&self->config);
self->config.free = free;
load_config_defaults (&self->config, g_config_table);
poller_init (&self->poller);
server_init (&self->server, &self->poller);
self->server.ctx = self;
str_map_init (&self->buffers_by_name);
self->buffers_by_name.key_xfrm = irc_strxfrm;
self->last_displayed_msg_time = time (NULL);
char *encoding = nl_langinfo (CODESET);
#ifdef __linux__
encoding = xstrdup_printf ("%s//TRANSLIT", encoding);
#else // ! __linux__
encoding = xstrdup (encoding);
#endif // ! __linux__
if ((self->term_from_utf8 =
iconv_open (encoding, "UTF-8")) == (iconv_t) -1
|| (self->latin1_to_utf8 =
iconv_open ("UTF-8", "ISO-8859-1")) == (iconv_t) -1
|| (self->term_to_utf8 =
iconv_open ("UTF-8", nl_langinfo (CODESET))) == (iconv_t) -1)
exit_fatal ("creating the UTF-8 conversion object failed: %s",
strerror (errno));
free (encoding);
}
static void
app_context_free (struct app_context *self)
{
str_map_free (&self->config);
for (size_t i = 0; i < ATTR_COUNT; i++)
free (self->attrs[i]);
// FIXME: this doesn't free the history state
LIST_FOR_EACH (struct buffer, iter, self->buffers)
buffer_destroy (iter);
str_map_free (&self->buffers_by_name);
server_free (&self->server);
poller_free (&self->poller);
iconv_close (self->latin1_to_utf8);
iconv_close (self->term_from_utf8);
iconv_close (self->term_to_utf8);
free (self->readline_prompt);
}
static void refresh_prompt (struct app_context *ctx);
static char *irc_cut_nickname (const char *prefix);
static const char *irc_find_userhost (const char *prefix);
// --- Attributed output -------------------------------------------------------
static struct
{
bool initialized; ///< Terminal is available
bool stdout_is_tty; ///< `stdout' is a terminal
bool stderr_is_tty; ///< `stderr' is a terminal
char *color_set_fg[8]; ///< Codes to set the foreground colour
char *color_set_bg[8]; ///< Codes to set the background colour
}
g_terminal;
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)
{
del_curterm (cur_term);
return false;
}
for (size_t i = 0; i < N_ELEMENTS (g_terminal.color_set_fg); 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 (size_t i = 0; i < N_ELEMENTS (g_terminal.color_set_fg); i++)
{
free (g_terminal.color_set_fg[i]);
free (g_terminal.color_set_bg[i]);
}
del_curterm (cur_term);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct app_readline_state
{
char *saved_line;
int saved_point;
int saved_mark;
};
static void
app_readline_hide (struct app_readline_state *state)
{
state->saved_point = rl_point;
state->saved_mark = rl_mark;
state->saved_line = rl_copy_text (0, rl_end);
rl_set_prompt ("");
rl_replace_line ("", 0);
rl_redisplay ();
}
static void
app_readline_restore (struct app_readline_state *state, const char *prompt)
{
rl_set_prompt (prompt);
rl_replace_line (state->saved_line, 0);
rl_point = state->saved_point;
rl_mark = state->saved_mark;
rl_redisplay ();
free (state->saved_line);
}
static void
app_readline_erase_to_bol (const char *prompt)
{
rl_set_prompt ("");
rl_replace_line ("", 0);
rl_point = rl_mark = 0;
rl_redisplay ();
rl_set_prompt (prompt);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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;
}
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;
if (printer)
tputs (ctx->attrs[attribute], 1, printer);
vfprintf (stream, fmt, ap);
if (printer)
tputs (ctx->attrs[ATTR_RESET], 1, printer);
}
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_readline_state state;
if (g_ctx->readline_prompt_shown)
app_readline_hide (&state);
print_attributed (g_ctx, stream, (intptr_t) user_data, "%s", quote);
vprint_attributed (g_ctx, stream, (intptr_t) user_data, fmt, ap);
fputs ("\n", stream);
if (g_ctx->readline_prompt_shown)
app_readline_restore (&state, g_ctx->readline_prompt);
}
static void
init_attribute (struct app_context *ctx, int id, const char *default_)
{
static const char *table[ATTR_COUNT] =
{
#define XX(x, y, z) [ATTR_ ## x] = "attr_" y,
ATTR_TABLE (XX)
#undef XX
};
const char *user = str_map_find (&ctx->config, table[id]);
if (user)
ctx->attrs[id] = xstrdup (user);
else
ctx->attrs[id] = xstrdup (default_);
}
static void
init_colors (struct app_context *ctx)
{
bool have_ti = init_terminal ();
// Use escape sequences from terminfo if possible, and SGR as a fallback
#define INIT_ATTR(id, ti) init_attribute (ctx, ATTR_ ## id, have_ti ? (ti) : "")
INIT_ATTR (PROMPT, enter_bold_mode);
INIT_ATTR (RESET, exit_attribute_mode);
INIT_ATTR (WARNING, g_terminal.color_set_fg[COLOR_YELLOW]);
INIT_ATTR (ERROR, g_terminal.color_set_fg[COLOR_RED]);
INIT_ATTR (EXTERNAL, g_terminal.color_set_fg[COLOR_WHITE]);
INIT_ATTR (TIMESTAMP, g_terminal.color_set_fg[COLOR_WHITE]);
INIT_ATTR (ACTION, g_terminal.color_set_fg[COLOR_RED]);
INIT_ATTR (JOIN, g_terminal.color_set_fg[COLOR_GREEN]);
INIT_ATTR (PART, g_terminal.color_set_fg[COLOR_RED]);
char *highlight = xstrdup_printf ("%s%s%s",
g_terminal.color_set_fg[COLOR_YELLOW],
g_terminal.color_set_bg[COLOR_MAGENTA],
enter_bold_mode);
INIT_ATTR (HIGHLIGHT, highlight);
free (highlight);
#undef INIT_ATTR
if (ctx->no_colors)
{
g_terminal.stdout_is_tty = false;
g_terminal.stderr_is_tty = false;
}
g_log_message_real = log_message_attributed;
}
// --- 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
sigterm_handler (int signum)
{
(void) signum;
g_termination_requested = true;
int original_errno = errno;
if (write (g_signal_pipe[1], "t", 1) == -1)
soft_assert (errno == EAGAIN);
errno = original_errno;
}
static void
sigwinch_handler (int signum)
{
(void) signum;
g_winch_received = true;
int original_errno = errno;
if (write (g_signal_pipe[1], "w", 1) == -1)
soft_assert (errno == EAGAIN);
errno = original_errno;
}
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);
struct sigaction sa;
sa.sa_flags = SA_RESTART;
sa.sa_handler = sigwinch_handler;
sigemptyset (&sa.sa_mask);
if (sigaction (SIGWINCH, &sa, NULL) == -1)
exit_fatal ("sigaction: %s", strerror (errno));
sa.sa_handler = sigterm_handler;
if (sigaction (SIGINT, &sa, NULL) == -1
|| sigaction (SIGTERM, &sa, NULL) == -1)
exit_fatal ("sigaction: %s", strerror (errno));
}
// --- 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
// #d inserts a signed integer; also supports the #<N> and #0<N> notation
//
// #a inserts named attributes (auto-resets)
// #r resets terminal attributes
// #c sets foreground color
// #C sets background color
enum formatter_item_type
{
FORMATTER_ITEM_TEXT, ///< Text
FORMATTER_ITEM_ATTR, ///< Formatting attributes
FORMATTER_ITEM_FG_COLOR, ///< Foreground color
FORMATTER_ITEM_BG_COLOR ///< Background color
};
struct formatter_item
{
LIST_HEADER (struct formatter_item)
enum formatter_item_type type; ///< Type of this item
int color; ///< Color
int attribute; ///< Attribute ID
char *text; ///< Either text or an attribute string
};
static struct formatter_item *
formatter_item_new (void)
{
struct formatter_item *self = xcalloc (1, sizeof *self);
return self;
}
static void
formatter_item_destroy (struct formatter_item *self)
{
free (self->text);
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct formatter
{
struct app_context *ctx; ///< Application context
bool ignore_new_attributes; ///< Whether to ignore new attributes
struct formatter_item *items; ///< Items
struct formatter_item *items_tail; ///< Tail of items
};
static void
formatter_init (struct formatter *self, struct app_context *ctx)
{
memset (self, 0, sizeof *self);
self->ctx = ctx;
}
static void
formatter_free (struct formatter *self)
{
LIST_FOR_EACH (struct formatter_item, iter, self->items)
formatter_item_destroy (iter);
}
static struct formatter_item *
formatter_add_blank (struct formatter *self)
{
struct formatter_item *item = formatter_item_new ();
LIST_APPEND_WITH_TAIL (self->items, self->items_tail, item);
return item;
}
static void
formatter_add_text (struct formatter *self, const char *text)
{
struct formatter_item *item = formatter_add_blank (self);
item->type = FORMATTER_ITEM_TEXT;
item->text = xstrdup (text);
}
static void
formatter_add_reset (struct formatter *self)
{
if (self->ignore_new_attributes)
return;
struct formatter_item *item = formatter_add_blank (self);
item->type = FORMATTER_ITEM_ATTR;
item->attribute = ATTR_RESET;
}
static void
formatter_add_attr (struct formatter *self, int attr_id)
{
if (self->ignore_new_attributes)
return;
struct formatter_item *item = formatter_add_blank (self);
item->type = FORMATTER_ITEM_ATTR;
item->attribute = attr_id;
}
static void
formatter_add_fg_color (struct formatter *self, int color)
{
if (self->ignore_new_attributes)
return;
struct formatter_item *item = formatter_add_blank (self);
item->type = FORMATTER_ITEM_FG_COLOR;
item->color = color;
}
static void
formatter_add_bg_color (struct formatter *self, int color)
{
if (self->ignore_new_attributes)
return;
struct formatter_item *item = formatter_add_blank (self);
item->type = FORMATTER_ITEM_BG_COLOR;
item->color = color;
}
static const char *
formatter_parse_field (struct formatter *self,
const char *field, struct str *buf, va_list *ap)
{
size_t width = 0;
bool zero_padded = false;
int c;
restart:
switch ((c = *field++))
{
char *s;
// We can push boring text content to the caller's buffer
// and let it flush the buffer only when it's actually needed
case 's':
s = va_arg (*ap, char *);
for (size_t len = strlen (s); len < width; len++)
str_append_c (buf, ' ');
str_append (buf, s);
break;
case 'd':
s = xstrdup_printf ("%d", va_arg (*ap, int));
for (size_t len = strlen (s); len < width; len++)
str_append_c (buf, " 0"[zero_padded]);
str_append (buf, s);
free (s);
break;
case 'a':
formatter_add_attr (self, va_arg (*ap, int));
break;
case 'c':
formatter_add_fg_color (self, va_arg (*ap, int));
break;
case 'C':
formatter_add_bg_color (self, va_arg (*ap, int));
break;
case 'r':
formatter_add_reset (self);
break;
default:
if (c == '0' && !zero_padded)
zero_padded = true;
else if (isdigit_ascii (c))
width = width * 10 + (c - '0');
else if (c)
hard_assert (!"unexpected format specifier");
else
hard_assert (!"unexpected end of format string");
goto restart;
}
return field;
}
static void
formatter_add (struct formatter *self, const char *format, ...)
{
struct str buf;
str_init (&buf);
va_list ap;
va_start (ap, format);
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);
va_end (ap);
}
static void
formatter_flush (struct formatter *self, FILE *stream)
{
terminal_printer_fn printer = get_attribute_printer (stream);
if (!printer)
{
LIST_FOR_EACH (struct formatter_item, iter, self->items)
if (iter->type == FORMATTER_ITEM_TEXT)
fputs (iter->text, stream);
return;
}
const char *attr_reset = self->ctx->attrs[ATTR_RESET];
tputs (attr_reset, 1, printer);
bool is_attributed = false;
LIST_FOR_EACH (struct formatter_item, iter, self->items)
{
switch (iter->type)
{
char *term;
case FORMATTER_ITEM_TEXT:
term = iconv_xstrdup
(self->ctx->term_from_utf8, iter->text, -1, NULL);
fputs (term, stream);
free (term);
break;
case FORMATTER_ITEM_ATTR:
if (is_attributed)
{
tputs (attr_reset, 1, printer);
is_attributed = false;
}
if (iter->attribute != ATTR_RESET)
{
tputs (self->ctx->attrs[iter->attribute], 1, printer);
is_attributed = true;
}
break;
case FORMATTER_ITEM_FG_COLOR:
tputs (g_terminal.color_set_fg[iter->color], 1, printer);
is_attributed = true;
break;
case FORMATTER_ITEM_BG_COLOR:
tputs (g_terminal.color_set_bg[iter->color], 1, printer);
is_attributed = true;
break;
}
}
if (is_attributed)
tputs (attr_reset, 1, printer);
}
// --- Buffers -----------------------------------------------------------------
static void
buffer_update_time (struct app_context *ctx, time_t now)
{
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[32] = "";
if (soft_assert (strftime (buf, sizeof buf, "%F", &current)))
print_status ("%s", buf);
// Else the buffer was too small, which is pretty weird
}
static void
buffer_line_display (struct app_context *ctx,
struct buffer_line *line, bool is_external)
{
// Normal timestamps don't include the date, this way the user won't be
// confused as to when an event has happened
buffer_update_time (ctx, line->when);
struct buffer_line_args *a = &line->args;
char *nick = NULL;
const char *userhost = NULL;
int nick_color = -1;
int object_color = -1;
if (a->who)
{
nick = irc_cut_nickname (a->who);
userhost = irc_find_userhost (a->who);
nick_color = str_map_hash (nick, strlen (nick)) % 8;
}
if (a->object)
object_color = str_map_hash (a->object, strlen (a->object)) % 8;
struct formatter f;
formatter_init (&f, ctx);
struct tm current;
if (!localtime_r (&line->when, &current))
print_error ("%s: %s", "localtime_r", strerror (errno));
else
formatter_add (&f, "#a#02d:#02d:#02d#r ",
ATTR_TIMESTAMP, current.tm_hour, current.tm_min, current.tm_sec);
// 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);
f.ignore_new_attributes = true;
}
// TODO: try to decode as much as possible using mIRC formatting;
// could either add a #m format specifier, or write a separate function
// to translate the formatting into formatter API calls
switch (line->type)
{
case BUFFER_LINE_PRIVMSG:
if (line->flags & BUFFER_LINE_HIGHLIGHT)
formatter_add (&f, "#a<#s>#r #s", ATTR_HIGHLIGHT, nick, a->text);
else
formatter_add (&f, "<#c#s#r> #s", nick_color, nick, a->text);
break;
case BUFFER_LINE_ACTION:
if (line->flags & BUFFER_LINE_HIGHLIGHT)
formatter_add (&f, " #a*#r ", ATTR_HIGHLIGHT);
else
formatter_add (&f, " #a*#r ", ATTR_ACTION);
formatter_add (&f, "#c#s#r #s", nick_color, nick, a->text);
break;
case BUFFER_LINE_NOTICE:
formatter_add (&f, " - ");
if (line->flags & BUFFER_LINE_HIGHLIGHT)
formatter_add (&f, "#a#s(#s)#r: #s",
ATTR_HIGHLIGHT, "Notice", nick, a->text);
else
formatter_add (&f, "#s(#c#s#r): #s",
"Notice", nick_color, nick, a->text);
break;
case BUFFER_LINE_JOIN:
formatter_add (&f, "#a-->#r ", ATTR_JOIN);
formatter_add (&f, "#c#s#r (#s) #a#s#r #s",
nick_color, nick, userhost,
ATTR_JOIN, "has joined", a->object);
break;
case BUFFER_LINE_PART:
formatter_add (&f, "#a<--#r ", ATTR_PART);
formatter_add (&f, "#c#s#r (#s) #a#s#r #s",
nick_color, nick, userhost,
ATTR_PART, "has left", a->object);
if (a->reason)
formatter_add (&f, " (#s)", a->reason);
break;
case BUFFER_LINE_KICK:
formatter_add (&f, "#a<--#r ", ATTR_PART);
formatter_add (&f, "#c#s#r (#s) #a#s#r #c#s#r",
nick_color, nick, userhost,
ATTR_PART, "has kicked", object_color, a->object);
if (a->reason)
formatter_add (&f, " (#s)", a->reason);
break;
case BUFFER_LINE_NICK:
formatter_add (&f, " - ");
if (a->who)
formatter_add (&f, "#c#s#r #s #c#s#r",
nick_color, nick,
"is now known as", object_color, a->object);
else
formatter_add (&f, "#s #s",
"You are now known as", a->object);
break;
case BUFFER_LINE_TOPIC:
formatter_add (&f, " - ");
formatter_add (&f, "#c#s#r #s \"#s\"",
nick_color, nick,
"has changed the topic to", a->text);
break;
case BUFFER_LINE_QUIT:
formatter_add (&f, "#a<--#r ", ATTR_PART);
formatter_add (&f, "#c#s#r (%s) #a#s#r",
nick_color, nick, userhost,
ATTR_PART, "has quit");
if (a->reason)
formatter_add (&f, " (#s)", a->reason);
break;
case BUFFER_LINE_STATUS:
formatter_add (&f, " - ");
formatter_add (&f, "#s", a->text);
break;
case BUFFER_LINE_ERROR:
formatter_add (&f, "#a=!=#r ", ATTR_ERROR);
formatter_add (&f, "#s", a->text);
}
free (nick);
struct app_readline_state state;
if (ctx->readline_prompt_shown)
app_readline_hide (&state);
// TODO: write the line to a log file; note that the global and server
// buffers musn't collide with filenames
formatter_add (&f, "\n");
formatter_flush (&f, stdout);
formatter_free (&f);
if (ctx->readline_prompt_shown)
app_readline_restore (&state, ctx->readline_prompt);
}
static void
buffer_send_internal (struct app_context *ctx, struct buffer *buffer,
enum buffer_line_type type, int flags,
struct buffer_line_args a)
{
struct buffer_line *line = buffer_line_new ();
line->type = type;
line->flags = flags;
line->when = time (NULL);
line->args = a;
LIST_APPEND_WITH_TAIL (buffer->lines, buffer->lines_tail, line);
buffer->lines_count++;
if (buffer == ctx->current_buffer)
buffer_line_display (ctx, line, false);
else if (!ctx->isolate_buffers &&
(buffer == ctx->global_buffer ||
buffer == ctx->current_buffer->server->buffer))
buffer_line_display (ctx, line, true);
else
{
buffer->unseen_messages_count++;
refresh_prompt (ctx);
}
}
#define buffer_send(ctx, buffer, type, flags, ...) \
buffer_send_internal ((ctx), (buffer), (type), (flags), \
(struct buffer_line_args) { __VA_ARGS__ })
#define buffer_send_status(ctx, buffer, ...) \
buffer_send (ctx, buffer, BUFFER_LINE_STATUS, 0, \
.text = xstrdup_printf (__VA_ARGS__))
#define buffer_send_error(ctx, buffer, ...) \
buffer_send (ctx, buffer, BUFFER_LINE_ERROR, 0, \
.text = xstrdup_printf (__VA_ARGS__))
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));
str_map_set (&ctx->buffers_by_name, buffer->name, buffer);
LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
// In theory this can't cause changes in the prompt
refresh_prompt (ctx);
}
static void
buffer_remove (struct app_context *ctx, struct buffer *buffer)
{
hard_assert (buffer != ctx->current_buffer);
// TODO: part from the channel if needed
// 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 buffer_activate() 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);
free (buffer->history);
rl_clear_history ();
history_set_history_state (state);
free (state);
}
#endif // RL_READLINE_VERSION
// 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);
str_map_set (&ctx->buffers_by_name, buffer->name, NULL);
LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
buffer_destroy (buffer);
if (buffer == ctx->last_buffer)
ctx->last_buffer = NULL;
// It's not a good idea to remove these buffers, but it's even a worse
// one to leave the pointers point to invalid memory
if (buffer == ctx->global_buffer)
ctx->global_buffer = NULL;
if (buffer == ctx->server.buffer)
ctx->server.buffer = NULL;
refresh_prompt (ctx);
}
static void
buffer_activate (struct app_context *ctx, struct buffer *buffer)
{
if (ctx->current_buffer == buffer)
return;
print_status ("%s", buffer->name);
// That is, minus the buffer switch line and the readline prompt
int to_display = MAX (10, ctx->lines - 2);
struct buffer_line *line = buffer->lines_tail;
while (line && line->prev && --to_display > 0)
line = line->prev;
// Once we've found where we want to start with the backlog, print it
for (; line; line = line->next)
buffer_line_display (ctx, line, false);
buffer->unseen_messages_count = 0;
// 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.
// 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 (ctx->current_buffer)
{
ctx->current_buffer->history = history_get_history_state ();
ctx->current_buffer->saved_line = rl_copy_text (0, rl_end);
ctx->current_buffer->saved_point = rl_point;
ctx->current_buffer->saved_mark = rl_mark;
}
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
// Restore the target buffer's history
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;
history_set_history_state (state);
free (state);
}
// Try to restore the target buffer's readline state
if (buffer->saved_line)
{
rl_replace_line (buffer->saved_line, 0);
rl_point = buffer->saved_point;
rl_mark = buffer->saved_mark;
free (buffer->saved_line);
buffer->saved_line = 0;
if (ctx->readline_prompt_shown)
rl_redisplay ();
}
// 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)
{
// TODO: try to merge the buffers as best as we can
}
static void
buffer_rename (struct app_context *ctx,
struct buffer *buffer, const char *new_name)
{
hard_assert (buffer->type == BUFFER_PM);
struct buffer *collision =
str_map_find (&buffer->server->irc_buffer_map, new_name);
if (collision)
{
// TODO: use full weechat-style buffer names
// to prevent name collisions with the global buffer
hard_assert (collision->type == BUFFER_PM);
// When there's a collision, there's not much else we can do
// other than somehow trying to merge them
buffer_merge (ctx, collision, buffer);
// TODO: log a status message about the merge
if (ctx->current_buffer == buffer)
buffer_activate (ctx, collision);
buffer_remove (ctx, buffer);
}
else
{
// Otherwise we just rename the buffer and that's it
str_map_set (&ctx->buffers_by_name, buffer->name, NULL);
str_map_set (&ctx->buffers_by_name, new_name, buffer);
free (buffer->name);
buffer->name = xstrdup (new_name);
// We might have renamed the current buffer
refresh_prompt (ctx);
}
}
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_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
init_buffers (struct app_context *ctx)
{
// At the moment we have only two global everpresent buffers
struct buffer *global = ctx->global_buffer = buffer_new ();
struct buffer *server = ctx->server.buffer = buffer_new ();
global->type = BUFFER_GLOBAL;
global->name = xstrdup (PROGRAM_NAME);
server->type = BUFFER_SERVER;
server->name = xstrdup (str_map_find (&ctx->config, "irc_host"));
server->server = &ctx->server;
LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, global);
LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, server);
}
// --- Users, channels ---------------------------------------------------------
static void
irc_user_on_destroy (void *object, void *user_data)
{
struct user *user = object;
struct server *s = user_data;
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 ();
user->on_destroy = irc_user_on_destroy;
user->user_data = s;
user->nickname = nickname;
str_map_set (&s->irc_users, user->nickname, user);
return user;
}
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 = str_map_find (&s->irc_users, nickname);
if (!user)
user = irc_make_user (s, xstrdup (nickname));
else
user = user_ref (user);
// Open a new buffer for the user
buffer = buffer_new ();
buffer->type = BUFFER_PM;
buffer->name = xstrdup (nickname);
buffer->server = s;
buffer->user = user;
LIST_APPEND_WITH_TAIL (s->ctx->buffers, s->ctx->buffers_tail, buffer);
str_map_set (&s->irc_buffer_map, user->nickname, buffer);
return buffer;
}
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);
}
// Then just unlink the user from the channel
LIST_UNLINK (channel->users, channel_user);
channel_user_destroy (channel_user);
}
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);
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 ();
channel->on_destroy = irc_channel_on_destroy;
channel->user_data = s;
channel->name = name;
channel->mode = xstrdup ("");
channel->topic = NULL;
str_map_set (&s->irc_channels, channel->name, channel);
return channel;
}
static void
irc_remove_user_from_channel (struct user *user, struct channel *channel)
{
LIST_FOR_EACH (struct channel_user, iter, channel->users)
if (iter->user == user)
irc_channel_unlink_user (channel, iter);
}
// --- Supporting code ---------------------------------------------------------
static char *
irc_cut_nickname (const char *prefix)
{
return xstrndup (prefix, strcspn (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)
{
char *nick = irc_cut_nickname (prefix);
bool result = !irc_strcmp (nick, s->irc_user->nickname);
free (nick);
return result;
}
static bool
irc_is_channel (struct server *s, const char *ident)
{
(void) s; // TODO: parse prefixes from server features
return *ident && !!strchr ("#&+!", *ident);
}
static void
irc_shutdown (struct server *s)
{
// TODO: set a timer after which we cut the connection?
// Generally non-critical
if (s->ssl)
soft_assert (SSL_shutdown (s->ssl) != -1);
else
soft_assert (shutdown (s->irc_fd, SHUT_WR) == 0);
}
static void
try_finish_quit (struct app_context *ctx)
{
// TODO: multiserver
if (ctx->quitting && ctx->server.irc_fd == -1)
ctx->polling = false;
}
static void
initiate_quit (struct app_context *ctx)
{
// First get rid of readline
if (ctx->readline_prompt_shown)
{
app_readline_erase_to_bol (ctx->readline_prompt);
ctx->readline_prompt_shown = false;
}
// This is okay as long as we're not called from within readline
rl_callback_handler_remove ();
buffer_send_status (ctx, ctx->global_buffer, "Shutting down");
// Initiate a connection close
// TODO: multiserver
struct server *s = &ctx->server;
if (s->irc_fd != -1)
// XXX: when we go async, we'll have to flush output buffers first
irc_shutdown (s);
ctx->quitting = true;
try_finish_quit (ctx);
}
// As of 2015, 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 (struct app_context *ctx, const char *text)
{
size_t len = strlen (text) + 1;
if (utf8_validate (text, len))
return xstrdup (text);
return iconv_xstrdup (ctx->latin1_to_utf8, (char *) text, len, NULL);
}
// This function is used to output debugging IRC traffic to the terminal.
// It's far from ideal, as any non-UTF-8 text degrades the entire line to
// ISO Latin 1. But it should work good enough most of the time.
static char *
irc_to_term (struct app_context *ctx, const char *text)
{
char *utf8 = irc_to_utf8 (ctx, text);
char *term = iconv_xstrdup (ctx->term_from_utf8, utf8, -1, NULL);
free (utf8);
return term;
}
static bool irc_send (struct server *s,
const char *format, ...) ATTRIBUTE_PRINTF (2, 3);
static bool
irc_send (struct server *s, const char *format, ...)
{
if (!soft_assert (s->irc_fd != -1))
{
print_debug ("tried sending a message to a dead server connection");
return false;
}
va_list ap;
va_start (ap, format);
struct str str;
str_init (&str);
str_append_vprintf (&str, format, ap);
va_end (ap);
if (g_debug_mode)
{
struct app_readline_state state;
if (s->ctx->readline_prompt_shown)
app_readline_hide (&state);
char *term = irc_to_term (s->ctx, str.str);
fprintf (stderr, "[IRC] <== \"%s\"\n", term);
free (term);
if (s->ctx->readline_prompt_shown)
app_readline_restore (&state, s->ctx->readline_prompt);
}
str_append (&str, "\r\n");
bool result = true;
if (s->ssl)
{
// TODO: call SSL_get_error() to detect if a clean shutdown has occured
if (SSL_write (s->ssl, str.str, str.len) != (int) str.len)
{
LOG_FUNC_FAILURE ("SSL_write",
ERR_error_string (ERR_get_error (), NULL));
result = false;
}
}
else if (write (s->irc_fd, str.str, str.len) != (ssize_t) str.len)
{
LOG_LIBC_FAILURE ("write");
result = false;
}
str_free (&str);
return result;
}
static bool
irc_get_boolean_from_config
(struct app_context *ctx, const char *name, bool *value, struct error **e)
{
const char *str = str_map_find (&ctx->config, name);
hard_assert (str != NULL);
if (set_boolean_if_valid (value, str))
return true;
error_set (e, "invalid configuration value for `%s'", name);
return false;
}
static bool
irc_initialize_ssl_ctx (struct server *s, struct error **e)
{
// XXX: maybe we should call SSL_CTX_set_options() for some workarounds
bool verify;
if (!irc_get_boolean_from_config (s->ctx, "ssl_verify", &verify, e))
return false;
if (!verify)
SSL_CTX_set_verify (s->ssl_ctx, SSL_VERIFY_NONE, NULL);
const char *ca_file = str_map_find (&s->ctx->config, "ca_file");
const char *ca_path = str_map_find (&s->ctx->config, "ca_path");
struct error *error = NULL;
if (ca_file || ca_path)
{
if (SSL_CTX_load_verify_locations (s->ssl_ctx, ca_file, ca_path))
return true;
error_set (&error, "%s: %s",
"Failed to set locations for the CA certificate bundle",
ERR_reason_error_string (ERR_get_error ()));
goto ca_error;
}
if (!SSL_CTX_set_default_verify_paths (s->ssl_ctx))
{
error_set (&error, "%s: %s",
"Couldn't load the default CA certificate bundle",
ERR_reason_error_string (ERR_get_error ()));
goto ca_error;
}
return true;
ca_error:
if (verify)
{
error_propagate (e, error);
return false;
}
// Only inform the user if we're not actually verifying
buffer_send_error (s->ctx, s->buffer, "%s", error->message);
error_free (error);
return true;
}
static bool
irc_initialize_ssl (struct server *s, struct error **e)
{
const char *error_info = NULL;
s->ssl_ctx = SSL_CTX_new (SSLv23_client_method ());
if (!s->ssl_ctx)
goto error_ssl_1;
if (!irc_initialize_ssl_ctx (s, e))
goto error_ssl_2;
s->ssl = SSL_new (s->ssl_ctx);
if (!s->ssl)
goto error_ssl_2;
const char *ssl_cert = str_map_find (&s->ctx->config, "ssl_cert");
if (ssl_cert)
{
char *path = resolve_config_filename (ssl_cert);
if (!path)
buffer_send_error (s->ctx, s->ctx->global_buffer,
"%s: %s", "Cannot open file", ssl_cert);
// XXX: perhaps we should read the file ourselves for better messages
else if (!SSL_use_certificate_file (s->ssl, path, SSL_FILETYPE_PEM)
|| !SSL_use_PrivateKey_file (s->ssl, path, SSL_FILETYPE_PEM))
buffer_send_error (s->ctx, s->ctx->global_buffer,
"%s: %s", "Setting the SSL client certificate failed",
ERR_error_string (ERR_get_error (), NULL));
free (path);
}
SSL_set_connect_state (s->ssl);
if (!SSL_set_fd (s->ssl, s->irc_fd))
goto error_ssl_3;
// Avoid SSL_write() returning SSL_ERROR_WANT_READ
SSL_set_mode (s->ssl, SSL_MODE_AUTO_RETRY);
switch (xssl_get_error (s->ssl, SSL_connect (s->ssl), &error_info))
{
case SSL_ERROR_NONE:
return true;
case SSL_ERROR_ZERO_RETURN:
error_info = "server closed the connection";
default:
break;
}
error_ssl_3:
SSL_free (s->ssl);
s->ssl = NULL;
error_ssl_2:
SSL_CTX_free (s->ssl_ctx);
s->ssl_ctx = NULL;
error_ssl_1:
// XXX: these error strings are really nasty; also there could be
// multiple errors on the OpenSSL stack.
if (!error_info)
error_info = ERR_error_string (ERR_get_error (), NULL);
error_set (e, "%s: %s", "could not initialize SSL", error_info);
return false;
}
static bool
irc_establish_connection (struct server *s,
const char *host, const char *port, struct error **e)
{
struct addrinfo gai_hints, *gai_result, *gai_iter;
memset (&gai_hints, 0, sizeof gai_hints);
gai_hints.ai_socktype = SOCK_STREAM;
int err = getaddrinfo (host, port, &gai_hints, &gai_result);
if (err)
{
error_set (e, "%s: %s: %s",
"connection failed", "getaddrinfo", gai_strerror (err));
return false;
}
int sockfd;
for (gai_iter = gai_result; gai_iter; gai_iter = gai_iter->ai_next)
{
sockfd = socket (gai_iter->ai_family,
gai_iter->ai_socktype, gai_iter->ai_protocol);
if (sockfd == -1)
continue;
set_cloexec (sockfd);
int yes = 1;
soft_assert (setsockopt (sockfd, SOL_SOCKET, SO_KEEPALIVE,
&yes, sizeof yes) != -1);
const char *real_host = host;
// Let's try to resolve the address back into a real hostname;
// we don't really need this, so we can let it quietly fail
char buf[NI_MAXHOST];
err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen,
buf, sizeof buf, NULL, 0, NI_NUMERICHOST);
if (err)
LOG_FUNC_FAILURE ("getnameinfo", gai_strerror (err));
else
real_host = buf;
char *address = format_host_port_pair (real_host, port);
buffer_send_status (s->ctx, s->buffer, "Connecting to %s...", address);
free (address);
if (!connect (sockfd, gai_iter->ai_addr, gai_iter->ai_addrlen))
break;
xclose (sockfd);
}
freeaddrinfo (gai_result);
if (!gai_iter)
{
error_set (e, "connection failed");
return false;
}
s->irc_fd = sockfd;
return true;
}
// --- More readline funky stuff -----------------------------------------------
static char *
make_unseen_prefix (struct app_context *ctx)
{
struct str active_buffers;
str_init (&active_buffers);
size_t i = 0;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
{
i++;
if (!iter->unseen_messages_count)
continue;
if (active_buffers.len)
str_append_c (&active_buffers, ',');
str_append_printf (&active_buffers, "%zu", i);
}
if (active_buffers.len)
return str_steal (&active_buffers);
str_free (&active_buffers);
return NULL;
}
static void
make_prompt (struct app_context *ctx, struct str *output)
{
struct buffer *buffer = ctx->current_buffer;
if (!soft_assert (buffer))
return;
str_append_c (output, '[');
char *unseen_prefix = make_unseen_prefix (ctx);
if (unseen_prefix)
str_append_printf (output, "(%s) ", unseen_prefix);
free (unseen_prefix);
str_append_printf (output, "%d:%s",
buffer_get_index (ctx, buffer), buffer->name);
if (buffer->type == BUFFER_CHANNEL && *buffer->channel->mode)
str_append_printf (output, "(%s)", buffer->channel->mode);
if (buffer != ctx->global_buffer)
{
struct server *s = buffer->server;
str_append_c (output, ' ');
if (s->irc_fd == -1)
str_append (output, "(disconnected)");
else
{
str_append (output, s->irc_user->nickname);
if (*s->irc_user_mode)
str_append_printf (output, "(%s)", s->irc_user_mode);
}
}
str_append_c (output, ']');
}
static void
refresh_prompt (struct app_context *ctx)
{
bool have_attributes = !!get_attribute_printer (stdout);
struct str prompt;
str_init (&prompt);
make_prompt (ctx, &prompt);
str_append_c (&prompt, ' ');
// After building the new prompt, replace the old one
free (ctx->readline_prompt);
if (!have_attributes)
ctx->readline_prompt = xstrdup (prompt.str);
else
{
// XXX: to be completely correct, we should use tputs, but we cannot
ctx->readline_prompt = xstrdup_printf ("%c%s%c%s%c%s%c",
RL_PROMPT_START_IGNORE, ctx->attrs[ATTR_PROMPT],
RL_PROMPT_END_IGNORE,
prompt.str,
RL_PROMPT_START_IGNORE, ctx->attrs[ATTR_RESET],
RL_PROMPT_END_IGNORE);
}
str_free (&prompt);
// First reset the prompt to work around a bug in readline
rl_set_prompt ("");
if (ctx->readline_prompt_shown)
rl_redisplay ();
rl_set_prompt (ctx->readline_prompt);
if (ctx->readline_prompt_shown)
rl_redisplay ();
}
static int
on_readline_goto_buffer (int count, int key)
{
(void) count;
int n = UNMETA (key) - '0';
if (n < 0 || n > 9)
return 0;
// There's no buffer zero
if (n == 0)
n = 10;
struct app_context *ctx = g_ctx;
if (ctx->last_buffer && buffer_get_index (ctx, ctx->current_buffer) == n)
// Fast switching between two buffers
buffer_activate (ctx, ctx->last_buffer);
else if (!buffer_goto (ctx, n == 0 ? 10 : n))
rl_ding ();
return 0;
}
static int
on_readline_previous_buffer (int count, int key)
{
(void) key;
struct app_context *ctx = g_ctx;
if (ctx->current_buffer)
buffer_activate (ctx, buffer_previous (ctx, count));
return 0;
}
static int
on_readline_next_buffer (int count, int key)
{
(void) key;
struct app_context *ctx = g_ctx;
if (ctx->current_buffer)
buffer_activate (ctx, buffer_next (ctx, count));
return 0;
}
static int
on_readline_return (int count, int key)
{
(void) count;
(void) key;
struct app_context *ctx = g_ctx;
// Let readline pass the line to our input handler
rl_done = 1;
// Save readline state
int saved_point = rl_point;
int saved_mark = rl_mark;
char *saved_line = rl_copy_text (0, rl_end);
// Erase the entire line from screen
rl_set_prompt ("");
rl_replace_line ("", 0);
rl_redisplay ();
ctx->readline_prompt_shown = false;
// Restore readline state
rl_set_prompt (ctx->readline_prompt);
rl_replace_line (saved_line, 0);
rl_point = saved_point;
rl_mark = saved_mark;
free (saved_line);
return 0;
}
static void
app_readline_bind_meta (char key, rl_command_func_t cb)
{
// This one seems to actually work
char keyseq[] = { '\\', 'e', key, 0 };
rl_bind_keyseq (keyseq, cb);
#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), cb);
#endif
}
static int
init_readline (void)
{
// 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
rl_add_defun ("previous-buffer", on_readline_previous_buffer, -1);
rl_add_defun ("next-buffer", on_readline_next_buffer, -1);
// Redefine M-0 through M-9 to switch buffers
for (int i = 0; i <= 9; i++)
app_readline_bind_meta ('0' + i, on_readline_goto_buffer);
rl_bind_keyseq ("\\C-p", rl_named_function ("previous-buffer"));
rl_bind_keyseq ("\\C-n", rl_named_function ("next-buffer"));
app_readline_bind_meta ('p', rl_named_function ("previous-history"));
app_readline_bind_meta ('n', rl_named_function ("next-history"));
// We need to hide the prompt first
rl_bind_key (RETURN, on_readline_return);
return 0;
}
// --- CTCP decoding -----------------------------------------------------------
#define CTCP_M_QUOTE '\020'
#define CTCP_X_DELIM '\001'
#define CTCP_X_QUOTE '\\'
struct ctcp_chunk
{
LIST_HEADER (struct ctcp_chunk)
bool is_extended; ///< Is this a tagged extended message?
struct str tag; ///< The tag, if any
struct str text; ///< Message contents
};
static struct ctcp_chunk *
ctcp_chunk_new (void)
{
struct ctcp_chunk *self = xcalloc (1, sizeof *self);
str_init (&self->tag);
str_init (&self->text);
return self;
}
static void
ctcp_chunk_destroy (struct ctcp_chunk *self)
{
str_free (&self->tag);
str_free (&self->text);
free (self);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
ctcp_low_level_decode (const char *message, struct str *output)
{
bool escape = false;
for (const char *p = message; *p; p++)
{
if (escape)
{
switch (*p)
{
case '0': str_append_c (output, '\0'); break;
case 'r': str_append_c (output, '\r'); break;
case 'n': str_append_c (output, '\n'); break;
default: str_append_c (output, *p);
}
escape = false;
}
else if (*p == CTCP_M_QUOTE)
escape = true;
else
str_append_c (output, *p);
}
}
static void
ctcp_intra_decode (const char *chunk, size_t len, struct str *output)
{
bool escape = false;
for (size_t i = 0; i < len; i++)
{
char c = chunk[i];
if (escape)
{
if (c == 'a')
str_append_c (output, CTCP_X_DELIM);
else
str_append_c (output, c);
escape = false;
}
else if (c == CTCP_X_QUOTE)
escape = true;
else
str_append_c (output, c);
}
}
static void
ctcp_parse_tagged (const char *chunk, size_t len, struct ctcp_chunk *output)
{
// We may search for the space before doing the higher level decoding,
// as it doesn't concern space characters at all
size_t tag_end = len;
for (size_t i = 0; i < len; i++)
if (chunk[i] == ' ')
{
tag_end = i;
break;
}
output->is_extended = true;
ctcp_intra_decode (chunk, tag_end, &output->tag);
if (tag_end++ != len)
ctcp_intra_decode (chunk + tag_end, len - tag_end, &output->text);
}
static struct ctcp_chunk *
ctcp_parse (const char *message)
{
struct str m;
str_init (&m);
ctcp_low_level_decode (message, &m);
struct ctcp_chunk *result = NULL, *result_tail = NULL;
size_t start = 0;
bool in_ctcp = false;
for (size_t i = 0; i < m.len; i++)
{
char c = m.str[i];
if (c != CTCP_X_DELIM)
continue;
// Remember the current state
size_t my_start = start;
bool my_is_ctcp = in_ctcp;
start = i + 1;
in_ctcp = !in_ctcp;
// Skip empty chunks
if (my_start == i)
continue;
struct ctcp_chunk *chunk = ctcp_chunk_new ();
if (my_is_ctcp)
ctcp_parse_tagged (m.str + my_start, i - my_start, chunk);
else
ctcp_intra_decode (m.str + my_start, i - my_start, &chunk->text);
LIST_APPEND_WITH_TAIL (result, result_tail, chunk);
}
// Finish the last text part. We ignore unended tagged chunks.
// TODO: don't ignore them, e.g. a /me may get cut off
if (!in_ctcp && start != m.len)
{
struct ctcp_chunk *chunk = ctcp_chunk_new ();
ctcp_intra_decode (m.str + start, m.len - start, &chunk->text);
LIST_APPEND_WITH_TAIL (result, result_tail, chunk);
}
str_free (&m);
return result;
}
static void
ctcp_destroy (struct ctcp_chunk *list)
{
LIST_FOR_EACH (struct ctcp_chunk, iter, list)
ctcp_chunk_destroy (iter);
}
// --- Input handling ----------------------------------------------------------
// TODO: we will need a proper mode parser; to be shared with kike
// TODO: we alse definitely need to parse server capability messages
static struct buffer *
irc_get_buffer_for_message (struct server *s,
const struct irc_message *msg, const char *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) ||
(channel && !buffer) || (!channel && !buffer));
// This is weird
if (!channel)
return NULL;
}
else if (!buffer)
{
// Implying that the target is us
// 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);
buffer = irc_get_or_make_user_buffer (s, nickname);
free (nickname);
}
return buffer;
}
static bool
irc_is_highlight (struct server *s, const char *message)
{
// Well, this is rather crude but it should make most users happy.
// Ideally we could do this at least in proper Unicode.
char *copy = xstrdup (message);
for (char *p = copy; *p; p++)
*p = irc_tolower (*p);
char *nick = xstrdup (s->irc_user->nickname);
for (char *p = nick; *p; p++)
*p = irc_tolower (*p);
// Special characters allowed in nicknames by RFC 2812: []\`_^{|} and -
// Also excluded from the ASCII: common user channel prefixes: +%@&~
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 void
irc_handle_join (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;
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) ||
(channel && !buffer) || (!channel && !buffer));
// We've joined a new channel
if (!channel && irc_is_this_us (s, msg->prefix))
{
buffer = buffer_new ();
buffer->type = BUFFER_CHANNEL;
buffer->name = xstrdup (channel_name);
buffer->server = s;
buffer->channel = channel =
irc_make_channel (s, xstrdup (channel_name));
LIST_APPEND_WITH_TAIL (s->ctx->buffers, s->ctx->buffers_tail, buffer);
str_map_set (&s->irc_buffer_map, channel->name, buffer);
buffer_activate (s->ctx, buffer);
}
// This is weird, ignoring
if (!channel)
return;
// Get or make a user object
char *nickname = irc_cut_nickname (msg->prefix);
struct user *user = str_map_find (&s->irc_users, nickname);
if (!user)
user = irc_make_user (s, nickname);
else
{
user = user_ref (user);
free (nickname);
}
// Link the user with the channel
struct user_channel *user_channel = user_channel_new ();
user_channel->channel = channel;
LIST_PREPEND (user->channels, user_channel);
struct channel_user *channel_user = channel_user_new ();
channel_user->user = user;
channel_user->modes = xstrdup ("");
LIST_PREPEND (channel->users, channel_user);
// Finally log the message
if (buffer)
{
buffer_send (s->ctx, buffer, BUFFER_LINE_JOIN, 0,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.object = irc_to_utf8 (s->ctx, 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 = "";
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) ||
(channel && !buffer) || (!channel && !buffer));
// It would be is weird for this to be false
if (user && channel)
irc_remove_user_from_channel (user, channel);
if (buffer)
{
buffer_send (s->ctx, buffer, BUFFER_LINE_KICK, 0,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.object = irc_to_utf8 (s->ctx, target),
.reason = irc_to_utf8 (s->ctx, message));
}
}
static void
irc_handle_mode (struct server *s, const struct irc_message *msg)
{
// TODO: parse the mode change and apply it
// TODO: log a message
}
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;
// What the fuck
// TODO: probably log a message and force a reconnect
if (str_map_find (&s->irc_users, new_nickname))
return;
// Log a message in any PM buffer and rename it;
// we may even have one for ourselves
struct buffer *pm_buffer =
str_map_find (&s->irc_buffer_map, user->nickname);
if (pm_buffer)
{
str_map_set (&s->irc_buffer_map, new_nickname, pm_buffer);
str_map_set (&s->irc_buffer_map, user->nickname, NULL);
char *who = irc_is_this_us (s, msg->prefix)
? irc_to_utf8 (s->ctx, msg->prefix)
: NULL;
buffer_send (s->ctx, pm_buffer, BUFFER_LINE_NICK, 0,
.who = who,
.object = irc_to_utf8 (s->ctx, new_nickname));
// TODO: use a full weechat-style buffer name here
buffer_rename (s->ctx, pm_buffer, new_nickname);
}
if (irc_is_this_us (s, msg->prefix))
{
// Log a message in all open buffers on this server
struct str_map_iter iter;
str_map_iter_init (&iter, &s->irc_buffer_map);
struct buffer *buffer;
while ((buffer = str_map_iter_next (&iter)))
{
// We've already done that
if (buffer == pm_buffer)
continue;
buffer_send (s->ctx, buffer, BUFFER_LINE_NICK, 0,
.object = irc_to_utf8 (s->ctx, 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);
buffer_send (s->ctx, buffer, BUFFER_LINE_NICK, 0,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.object = irc_to_utf8 (s->ctx, new_nickname));
}
}
// Finally rename the user
str_map_set (&s->irc_users, new_nickname, user_ref (user));
str_map_set (&s->irc_users, user->nickname, NULL);
free (user->nickname);
user->nickname = xstrdup (new_nickname);
// We might have renamed ourselves
refresh_prompt (s->ctx);
}
static void
irc_handle_ctcp_reply (struct server *s,
const struct irc_message *msg, struct ctcp_chunk *chunk)
{
char *nickname = irc_cut_nickname (msg->prefix);
char *nickname_utf8 = irc_to_utf8 (s->ctx, nickname);
char *tag_utf8 = irc_to_utf8 (s->ctx, chunk->tag.str);
char *text_utf8 = irc_to_utf8 (s->ctx, chunk->text.str);
buffer_send_status (s->ctx, s->buffer,
"CTCP reply from %s: %s %s", nickname_utf8, tag_utf8, text_utf8);
free (nickname);
free (nickname_utf8);
free (tag_utf8);
free (text_utf8);
}
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)
{
// TODO: some more obvious indication of highlights
int flags = irc_is_highlight (s, text->str)
? BUFFER_LINE_HIGHLIGHT
: 0;
buffer_send (s->ctx, buffer, BUFFER_LINE_NOTICE, flags,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.text = irc_to_utf8 (s->ctx, text->str));
}
}
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 = "";
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) ||
(channel && !buffer) || (!channel && !buffer));
// It would be is weird for this to be false
if (user && channel)
irc_remove_user_from_channel (user, channel);
if (buffer)
{
buffer_send (s->ctx, buffer, BUFFER_LINE_PART, 0,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.object = irc_to_utf8 (s->ctx, channel_name),
.reason = irc_to_utf8 (s->ctx, message));
}
}
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_init (&m);
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);
char *text_utf8 = irc_to_utf8 (s->ctx, m.str);
char *recipient_utf8 = irc_to_utf8 (s->ctx, recipient);
str_free (&m);
buffer_send_status (s->ctx, s->buffer,
"CTCP reply to %s: %s", recipient_utf8, text_utf8);
free (text_utf8);
free (recipient_utf8);
}
static void
irc_handle_ctcp_request (struct server *s,
const struct irc_message *msg, struct ctcp_chunk *chunk)
{
char *nickname = irc_cut_nickname (msg->prefix);
char *nickname_utf8 = irc_to_utf8 (s->ctx, nickname);
char *tag_utf8 = irc_to_utf8 (s->ctx, chunk->tag.str);
buffer_send_status (s->ctx, s->buffer,
"CTCP requested by %s: %s", nickname_utf8, tag_utf8);
const char *target = msg->params.vector[0];
const char *recipient = nickname;
if (irc_is_channel (s, target))
recipient = target;
if (!strcmp (chunk->tag.str, "CLIENTINFO"))
irc_send_ctcp_reply (s, recipient, "CLIENTINFO %s %s %s %s",
"PING", "VERSION", "TIME", "CLIENTINFO");
else if (!strcmp (chunk->tag.str, "PING"))
irc_send_ctcp_reply (s, recipient, "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, recipient, "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, recipient, "TIME %s", buf);
}
free (nickname);
free (nickname_utf8);
free (tag_utf8);
}
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)
{
// TODO: some more obvious indication of highlights
int flags = irc_is_highlight (s, text->str)
? BUFFER_LINE_HIGHLIGHT
: 0;
enum buffer_line_type type = is_action
? BUFFER_LINE_ACTION
: BUFFER_LINE_PRIVMSG;
buffer_send (s->ctx, buffer, type, flags,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.text = irc_to_utf8 (s->ctx, text->str));
}
}
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
irc_handle_quit (struct server *s, const struct irc_message *msg)
{
if (!msg->prefix)
return;
// What the fuck
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 = "";
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)
{
buffer_send (s->ctx, buffer, BUFFER_LINE_QUIT, 0,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.reason = irc_to_utf8 (s->ctx, message));
// TODO: set some kind of a flag in the buffer and when the user
// reappers 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)
{
buffer = str_map_find (&s->irc_buffer_map, iter->channel->name);
if (buffer)
buffer_send (s->ctx, buffer, BUFFER_LINE_QUIT, 0,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.reason = irc_to_utf8 (s->ctx, message));
// This destroys "iter" which doesn't matter to us
irc_remove_user_from_channel (user, iter->channel);
}
}
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) ||
(channel && !buffer) || (!channel && !buffer));
// It would be is weird for this to be false
if (channel)
{
free (channel->topic);
channel->topic = xstrdup (topic);
}
if (buffer)
{
buffer_send (s->ctx, buffer, BUFFER_LINE_TOPIC, 0,
.who = irc_to_utf8 (s->ctx, msg->prefix),
.text = irc_to_utf8 (s->ctx, topic));
}
}
static struct irc_handler
{
char *name;
void (*handler) (struct server *s, const struct irc_message *msg);
}
g_irc_handlers[] =
{
// This list needs to stay sorted
{ "JOIN", irc_handle_join },
{ "KICK", irc_handle_kick },
{ "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 },
{ "TOPIC", irc_handle_topic },
};
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 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))
{
free (s->irc_user_host);
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 str_vector v;
str_vector_init (&v);
split_str_ignore_empty (m, ' ', &v);
for (size_t i = 0; i < v.len; i++)
if (irc_try_parse_word_for_userhost (s, v.vector[i]))
break;
str_vector_free (&v);
}
static void
irc_process_numeric (struct server *s,
const struct irc_message *msg, unsigned long numeric)
{
// Numerics typically have human-readable information
// TODO: try to output certain replies in more specific buffers
// 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 str_vector copy;
str_vector_init (&copy);
str_vector_add_vector (&copy, msg->params.vector + !!msg->params.len);
// Join the parameter vector back, recode it to our internal encoding
// and send it to the server buffer
char *reconstructed = join_str_vector (&copy, ' ');
str_vector_free (&copy);
buffer_send (s->ctx, s->buffer, BUFFER_LINE_STATUS, 0,
.text = irc_to_utf8 (s->ctx, reconstructed));
free (reconstructed);
switch (numeric)
{
case IRC_RPL_WELCOME:
// 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_ISUPPORT:
// TODO: parse this, mainly PREFIX; see
// http://www.irc.org/tech_docs/draft-brocklesby-irc-isupport-03.txt
break;
case IRC_RPL_NAMREPLY:
// TODO: find the channel and if found, push nicks to names_buf
break;
case IRC_RPL_ENDOFNAMES:
// TODO: find the channel and if found, overwrite users;
// however take care to combine channel user modes
break;
case IRC_ERR_NICKNAMEINUSE:
// TODO: if not connected yet (irc_ready), use a different nick;
// either use a number suffix, or accept commas in "nickname" config
break;
}
}
static void
irc_process_message (const struct irc_message *msg,
const char *raw, void *user_data)
{
struct server *s = user_data;
if (g_debug_mode)
{
struct app_readline_state state;
if (s->ctx->readline_prompt_shown)
app_readline_hide (&state);
char *term = irc_to_term (s->ctx, raw);
fprintf (stderr, "[IRC] ==> \"%s\"\n", term);
free (term);
if (s->ctx->readline_prompt_shown)
app_readline_restore (&state, s->ctx->readline_prompt);
}
// XXX: or is the 001 numeric enough? For what?
if (!s->irc_ready && (!strcasecmp (msg->command, "MODE")
|| !strcasecmp (msg->command, "376") // RPL_ENDOFMOTD
|| !strcasecmp (msg->command, "422"))) // ERR_NOMOTD
{
// XXX: should we really print this?
buffer_send_status (s->ctx, s->buffer, "Successfully connected");
s->irc_ready = true;
refresh_prompt (s->ctx);
// TODO: parse any response and store the result for us in app_context;
// this enables proper message splitting on output;
// we can also use WHOIS if it's not supported (optional by RFC 2812)
irc_send (s, "USERHOST %s", s->irc_user->nickname);
const char *autojoin = str_map_find (&s->ctx->config, "autojoin");
if (autojoin)
irc_send (s, "JOIN :%s", autojoin);
}
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);
}
// --- Message autosplitting magic ---------------------------------------------
// This is the most basic acceptable 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, size_t text_len,
size_t line_len, struct str *output)
{
int 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 (line_len && word_len <= line_len)
{
if (word_len)
{
str_append_data (output, text, word_len);
text += word_len;
eaten += word_len;
line_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
while (true)
{
const char *next = utf8_next (text, text_len - eaten);
hard_assert (next);
size_t char_len = next - text;
if (char_len > line_len)
break;
str_append_data (output, text, char_len);
text += char_len;
eaten += char_len;
line_len -= char_len;
}
return eaten;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
wrap_message (const char *message,
int line_max, struct str_vector *output, struct error **e)
{
if (line_max <= 0)
goto error;
for (size_t message_left = strlen (message); message_left; )
{
struct str m;
str_init (&m);
size_t eaten = wrap_text_for_single_line (message,
MIN ((size_t) line_max, message_left), message_left, &m);
if (!eaten)
{
str_free (&m);
goto error;
}
str_vector_add_owned (output, str_steal (&m));
message += eaten;
message_left -= eaten;
}
return true;
error:
// Well, that's just weird
error_set (e,
"Message splitting was unsuccessful as there was "
"too little room for UTF-8 characters");
return false;
}
/// 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 str_vector *output, struct error **e)
{
// :<nick>!<user>@<host> <fixed-part><message>
int space_in_one_message = 0;
if (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;
// However we don't always have the full info for message splitting
if (!space_in_one_message)
str_vector_add (output, message);
else if (!wrap_message (message, space_in_one_message, output, e))
return false;
return true;
}
struct send_autosplit_args;
typedef void (*send_autosplit_logger_fn) (struct server *s,
struct send_autosplit_args *args, struct buffer *buffer, const char *line);
struct send_autosplit_args
{
const char *command; ///< E.g. PRIVMSG or NOTICE
const char *target; ///< User or channel
const char *message; ///< A message to be autosplit
send_autosplit_logger_fn logger; ///< Logger for all resulting lines
const char *prefix; ///< E.g. "\x01ACTION"
const char *suffix; ///< E.g. "\x01"
};
static void
send_autosplit_message (struct server *s, struct send_autosplit_args a)
{
struct buffer *buffer = str_map_find (&s->irc_buffer_map, a.target);
int fixed_part = strlen (a.command) + 1 + strlen (a.target) + 1 + 1
+ strlen (a.prefix) + strlen (a.suffix);
struct str_vector lines;
str_vector_init (&lines);
struct error *e = NULL;
if (!irc_autosplit_message (s, a.message, fixed_part, &lines, &e))
{
buffer_send_error (s->ctx,
buffer ? buffer : s->buffer, "%s", e->message);
error_free (e);
goto end;
}
for (size_t i = 0; i < lines.len; i++)
{
irc_send (s, "%s %s :%s%s%s", a.command, a.target,
a.prefix, lines.vector[i], a.suffix);
a.logger (s, &a, buffer, lines.vector[i]);
}
end:
str_vector_free (&lines);
}
static void
log_outcoming_action (struct server *s,
struct send_autosplit_args *a, struct buffer *buffer, const char *line)
{
(void) a;
if (buffer)
buffer_send (s->ctx, buffer, BUFFER_LINE_ACTION, 0,
.who = irc_to_utf8 (s->ctx, s->irc_user->nickname),
.text = irc_to_utf8 (s->ctx, line));
// This can only be sent from a user or channel buffer
}
#define SEND_AUTOSPLIT_ACTION(s, target, message) \
send_autosplit_message ((s), (struct send_autosplit_args) \
{ "PRIVMSG", (target), (message), log_outcoming_action, \
"\x01" "ACTION ", "\x01" })
static void
log_outcoming_privmsg (struct server *s,
struct send_autosplit_args *a, struct buffer *buffer, const char *line)
{
if (buffer)
buffer_send (s->ctx, buffer, BUFFER_LINE_PRIVMSG, 0,
.who = irc_to_utf8 (s->ctx, s->irc_user->nickname),
.text = irc_to_utf8 (s->ctx, line));
else
// TODO: fix logging and encoding
buffer_send (s->ctx, s->buffer, BUFFER_LINE_STATUS, 0,
.text = xstrdup_printf ("MSG(%s): %s", a->target, line));
}
#define SEND_AUTOSPLIT_PRIVMSG(s, target, message) \
send_autosplit_message ((s), (struct send_autosplit_args) \
{ "PRIVMSG", (target), (message), log_outcoming_privmsg, "", "" })
static void
log_outcoming_notice (struct server *s,
struct send_autosplit_args *a, struct buffer *buffer, const char *line)
{
if (buffer)
buffer_send (s->ctx, buffer, BUFFER_LINE_NOTICE, 0,
.who = irc_to_utf8 (s->ctx, s->irc_user->nickname),
.text = irc_to_utf8 (s->ctx, line));
else
// TODO: fix logging and encoding
buffer_send (s->ctx, s->buffer, BUFFER_LINE_STATUS, 0,
.text = xstrdup_printf ("Notice -> %s: %s", a->target, line));
}
#define SEND_AUTOSPLIT_NOTICE(s, target, message) \
send_autosplit_message ((s), (struct send_autosplit_args) \
{ "NOTICE", (target), (message), log_outcoming_notice, "", "" })
// --- User input handling -----------------------------------------------------
static bool handle_command_help (struct app_context *, char *);
/// 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, " \t");
char *end = start + word_len;
*s = end + strspn (end, " \t");
*end = '\0';
return start;
}
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))
buffer_send_error (ctx, ctx->global_buffer,
"%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);
// TODO: decode the global and server buffers, partial matches
return buffer;
}
static bool
server_command_check (struct app_context *ctx, const char *action)
{
if (ctx->current_buffer->type == BUFFER_GLOBAL)
buffer_send_error (ctx, ctx->current_buffer,
"Can't do this from a global buffer (%s)", action);
else
{
struct server *s = ctx->current_buffer->server;
if (s->irc_fd == -1)
buffer_send_error (ctx, s->buffer, "Not connected");
else
return true;
}
return false;
}
static void
show_buffers_list (struct app_context *ctx)
{
buffer_send_status (ctx, ctx->global_buffer, "%s", "");
buffer_send_status (ctx, ctx->global_buffer, "Buffers list:");
int i = 1;
LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
buffer_send_status (ctx, ctx->global_buffer,
" [%d] %s", i++, iter->name);
}
static void
handle_buffer_close (struct app_context *ctx, char *arguments)
{
struct buffer *buffer = NULL;
const char *which = NULL;
if (!*arguments)
buffer = ctx->current_buffer;
else
buffer = try_decode_buffer (ctx, (which = cut_word (&arguments)));
if (!buffer)
buffer_send_error (ctx, ctx->global_buffer,
"%s: %s", "No such buffer", which);
else if (buffer == ctx->global_buffer)
buffer_send_error (ctx, ctx->global_buffer,
"Can't close the global buffer");
else if (buffer->type == BUFFER_SERVER)
buffer_send_error (ctx, ctx->global_buffer,
"Can't close a server buffer");
else
{
if (buffer == ctx->current_buffer)
buffer_activate (ctx, buffer_next (ctx, 1));
buffer_remove (ctx, buffer);
}
}
static bool
handle_command_buffer (struct app_context *ctx, char *arguments)
{
char *action = cut_word (&arguments);
if (try_handle_buffer_goto (ctx, action))
return true;
// XXX: also build a prefix map?
// TODO: some subcommand to print N last lines from the buffer
if (!strcasecmp_ascii (action, "list"))
show_buffers_list (ctx);
else if (!strcasecmp_ascii (action, "clear"))
{
// TODO
}
else if (!strcasecmp_ascii (action, "move"))
{
// TODO: unlink the buffer and link it back at index;
// we will probably need to extend liberty for this
}
else if (!strcasecmp_ascii (action, "close"))
handle_buffer_close (ctx, arguments);
else
return false;
return true;
}
static bool
handle_command_msg (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "send messages"))
return true;
if (!*arguments)
return false;
struct server *s = ctx->current_buffer->server;
char *target = cut_word (&arguments);
if (!*arguments)
buffer_send_error (ctx, s->buffer, "No text to send");
else
SEND_AUTOSPLIT_PRIVMSG (s, target, arguments);
return true;
}
static bool
handle_command_query (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "send messages"))
return true;
if (!*arguments)
return false;
struct server *s = ctx->current_buffer->server;
char *target = cut_word (&arguments);
if (irc_is_channel (s, target))
buffer_send_error (ctx, s->buffer, "Cannot query a channel");
else if (!*arguments)
buffer_send_error (ctx, s->buffer, "No text to send");
else
{
buffer_activate (ctx, irc_get_or_make_user_buffer (s, target));
SEND_AUTOSPLIT_PRIVMSG (s, target, arguments);
}
return true;
}
static bool
handle_command_notice (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "send messages"))
return true;
if (!*arguments)
return false;
struct server *s = ctx->current_buffer->server;
char *target = cut_word (&arguments);
if (!*arguments)
buffer_send_error (ctx, s->buffer, "No text to send");
else
SEND_AUTOSPLIT_NOTICE (s, target, arguments);
return true;
}
static bool
handle_command_ctcp (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "send messages"))
return true;
if (!*arguments)
return false;
char *target = cut_word (&arguments);
if (!*arguments)
return false;
char *tag = cut_word (&arguments);
for (char *p = tag; *p; p++)
*p = toupper_ascii (*p);
struct server *s = ctx->current_buffer->server;
if (*arguments)
irc_send (s, "PRIVMSG %s :\x01%s %s\x01", target, tag, arguments);
else
irc_send (s, "PRIVMSG %s :\x01%s\x01", target, tag);
buffer_send_status (ctx, s->buffer,
"CTCP query to %s: %s", target, tag);
return true;
}
static bool
handle_command_me (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "send messages"))
return true;
struct server *s = ctx->current_buffer->server;
if (ctx->current_buffer->type == BUFFER_CHANNEL)
SEND_AUTOSPLIT_ACTION (s,
ctx->current_buffer->channel->name, arguments);
else if (ctx->current_buffer->type == BUFFER_PM)
SEND_AUTOSPLIT_ACTION (s,
ctx->current_buffer->user->nickname, arguments);
else
buffer_send_error (ctx, s->buffer,
"Can't do this from a server buffer (%s)",
"send CTCP actions");
return true;
}
static bool
handle_command_quit (struct app_context *ctx, char *arguments)
{
// TODO: multiserver
struct server *s = &ctx->server;
if (s->irc_fd != -1)
{
if (*arguments)
irc_send (s, "QUIT :%s", arguments);
else
irc_send (s, "QUIT :%s", PROGRAM_NAME " " PROGRAM_VERSION);
}
initiate_quit (ctx);
return true;
}
static bool
handle_command_join (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "join"))
return true;
struct server *s = ctx->current_buffer->server;
if (*arguments)
// TODO: check if the arguments are in the form of
// "channel(,channel)* key(,key)*"
irc_send (s, "JOIN %s", arguments);
else
{
if (ctx->current_buffer->type != BUFFER_CHANNEL)
buffer_send_error (ctx, ctx->current_buffer,
"%s: %s", "Can't join",
"no argument given and this buffer is not a channel");
// TODO: have a better way of checking if we're on the channel
else if (ctx->current_buffer->channel->users)
buffer_send_error (ctx, ctx->current_buffer,
"%s: %s", "Can't join",
"you already are on the channel");
else
// TODO: send the key if known
irc_send (s, "JOIN %s", ctx->current_buffer->channel->name);
}
return true;
}
static bool
handle_command_part (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "part"))
return true;
struct server *s = ctx->current_buffer->server;
if (*arguments)
// TODO: check if the arguments are in the form of "channel(,channel)*"
// TODO: make sure to send the reason as one argument
irc_send (s, "PART %s", arguments);
else
{
if (ctx->current_buffer->type != BUFFER_CHANNEL)
buffer_send_error (ctx, ctx->current_buffer,
"%s: %s", "Can't part",
"no argument given and this buffer is not a channel");
// TODO: have a better way of checking if we're on the channel
else if (!ctx->current_buffer->channel->users)
buffer_send_error (ctx, ctx->current_buffer,
"%s: %s", "Can't join", "you're not on the channel");
else
irc_send (s, "PART %s", ctx->current_buffer->channel->name);
}
return true;
}
static bool
handle_command_list (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "list channels"))
return true;
struct server *s = ctx->current_buffer->server;
if (*arguments)
irc_send (s, "LIST %s", arguments);
else
irc_send (s, "LIST");
return true;
}
static bool
handle_command_nick (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "change nickname"))
return true;
if (!*arguments)
return false;
struct server *s = ctx->current_buffer->server;
irc_send (s, "NICK %s", cut_word (&arguments));
return true;
}
static bool
handle_command_quote (struct app_context *ctx, char *arguments)
{
if (!server_command_check (ctx, "quote"))
return true;
struct server *s = ctx->current_buffer->server;
irc_send (s, "%s", arguments);
return true;
}
static struct command_handler
{
const char *name;
bool (*handler) (struct app_context *ctx, char *arguments);
const char *description;
const char *usage;
}
g_command_handlers[] =
{
{ "help", handle_command_help, "Show help",
"[command]" },
{ "quit", handle_command_quit, "Quit the program",
"[message]" },
{ "buffer", handle_command_buffer, "Manage buffers",
"list | clear | move | { close [<number> | <name>] } | <number>" },
{ "msg", handle_command_msg, "Send message to a nick or channel",
"<target> <message>" },
{ "query", handle_command_query, "Send a private message to a nick",
"<nick> <message>" },
{ "notice", handle_command_notice, "Send notice to a nick or channel",
"<target> <message>" },
{ "ctcp", handle_command_ctcp, "Send a CTCP query",
"<target> <tag>" },
{ "me", handle_command_me, "Send a CTCP action",
"<message>" },
{ "join", handle_command_join, "Join channels",
"[<channel>[,<channel>...]]" },
{ "part", handle_command_part, "Leave channels",
"[<channel>[,<channel>...]]" },
#if 0
{ "cycle", NULL, "", "" },
{ "mode", NULL, "", "" },
{ "topic", NULL, "", "" },
{ "kick", NULL, "", "" },
{ "kickban", NULL, "", "" },
{ "ban", NULL, "", "" },
{ "invite", NULL, "", "" },
#endif
{ "list", handle_command_list, "List channels and their topic",
"[<channel>[,<channel>...]] [server]" },
#if 0
{ "names", NULL, "", "" },
{ "who", NULL, "", "" },
{ "whois", NULL, "", "" },
{ "motd", NULL, "", "" },
{ "away", NULL, "", "" },
#endif
{ "nick", handle_command_nick, "Change current nick",
"<nickname>" },
{ "quote", handle_command_quote, "Send a raw command to the server",
"<command>" },
};
static bool
handle_command_help (struct app_context *ctx, char *arguments)
{
if (!*arguments)
{
buffer_send_status (ctx, ctx->global_buffer, "%s", "");
buffer_send_status (ctx, ctx->global_buffer, "Commands:");
for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
{
struct command_handler *handler = &g_command_handlers[i];
buffer_send_status (ctx, ctx->global_buffer, " %s: %s",
handler->name, handler->description);
}
return true;
}
char *command = cut_word (&arguments);
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))
{
buffer_send_status (ctx, ctx->global_buffer, "%s", "");
buffer_send_status (ctx, ctx->global_buffer, "%s: %s",
handler->name, handler->description);
buffer_send_status (ctx, ctx->global_buffer, " Arguments: %s",
handler->usage);
return true;
}
}
buffer_send_error (ctx, ctx->global_buffer,
"%s: %s", "No such command", command);
return true;
}
static int
command_handler_cmp_by_length (const void *a, const void *b)
{
const struct command_handler *first = a;
const struct command_handler *second = b;
return strlen (first->name) - strlen (second->name);
}
static void
init_partial_matching_user_command_map (struct str_map *partial)
{
// Trivially create a partial matching map
str_map_init (partial);
partial->key_xfrm = tolower_ascii_strxfrm;
// We process them from the longest to the shortest one,
// so that common prefixes favor shorter entries
struct command_handler *by_length[N_ELEMENTS (g_command_handlers)];
for (size_t i = 0; i < N_ELEMENTS (by_length); i++)
by_length[i] = &g_command_handlers[i];
qsort (by_length, N_ELEMENTS (by_length), sizeof *by_length,
command_handler_cmp_by_length);
for (size_t i = N_ELEMENTS (by_length); i--; )
{
char *copy = xstrdup (by_length[i]->name);
for (size_t part = strlen (copy); part; part--)
{
copy[part] = '\0';
str_map_set (partial, copy, by_length[i]);
}
free (copy);
}
}
static void
process_user_command (struct app_context *ctx, char *command)
{
static bool initialized = false;
static struct str_map partial;
if (!initialized)
{
init_partial_matching_user_command_map (&partial);
initialized = true;
}
char *name = cut_word (&command);
if (try_handle_buffer_goto (ctx, name))
return;
struct command_handler *handler = str_map_find (&partial, name);
if (!handler)
buffer_send_error (ctx, ctx->global_buffer,
"%s: %s", "No such command", name);
else if (!handler->handler (ctx, command))
buffer_send_error (ctx, ctx->global_buffer,
"%s: /%s %s", "Usage", handler->name, handler->usage);
}
static void
send_message_to_target (struct server *s,
const char *target, char *message, struct buffer *buffer)
{
if (s->irc_fd == -1)
{
buffer_send_error (s->ctx, buffer, "Not connected");
return;
}
SEND_AUTOSPLIT_PRIVMSG (s, target, message);
}
static void
send_message_to_current_buffer (struct app_context *ctx, char *message)
{
struct buffer *buffer = ctx->current_buffer;
hard_assert (buffer != NULL);
switch (buffer->type)
{
case BUFFER_GLOBAL:
case BUFFER_SERVER:
buffer_send_error (ctx, buffer, "This buffer is not a channel");
break;
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;
}
}
static void
process_input (struct app_context *ctx, char *user_input)
{
char *input;
size_t len;
if (!(input = iconv_xstrdup (ctx->term_to_utf8, user_input, -1, &len)))
print_error ("character conversion failed for `%s'", "user input");
else if (input[0] != '/')
send_message_to_current_buffer (ctx, input);
else if (input[1] == '/')
send_message_to_current_buffer (ctx, input + 1);
else
process_user_command (ctx, input + 1);
free (input);
}
// --- Supporting code (continued) ---------------------------------------------
enum irc_read_result
{
IRC_READ_OK, ///< Some data were read successfully
IRC_READ_EOF, ///< The server has closed connection
IRC_READ_AGAIN, ///< No more data at the moment
IRC_READ_ERROR ///< General connection failure
};
static enum irc_read_result
irc_fill_read_buffer_ssl (struct server *s, struct str *buf)
{
int n_read;
start:
n_read = SSL_read (s->ssl, buf->str + buf->len,
buf->alloc - buf->len - 1 /* null byte */);
const char *error_info = NULL;
switch (xssl_get_error (s->ssl, n_read, &error_info))
{
case SSL_ERROR_NONE:
buf->str[buf->len += n_read] = '\0';
return IRC_READ_OK;
case SSL_ERROR_ZERO_RETURN:
return IRC_READ_EOF;
case SSL_ERROR_WANT_READ:
return IRC_READ_AGAIN;
case SSL_ERROR_WANT_WRITE:
{
// Let it finish the handshake as we don't poll for writability;
// any errors are to be collected by SSL_read() in the next iteration
struct pollfd pfd = { .fd = s->irc_fd, .events = POLLOUT };
soft_assert (poll (&pfd, 1, 0) > 0);
goto start;
}
case XSSL_ERROR_TRY_AGAIN:
goto start;
default:
LOG_FUNC_FAILURE ("SSL_read", error_info);
return IRC_READ_ERROR;
}
}
static enum irc_read_result
irc_fill_read_buffer (struct server *s, struct str *buf)
{
ssize_t n_read;
start:
n_read = recv (s->irc_fd, buf->str + buf->len,
buf->alloc - buf->len - 1 /* null byte */, 0);
if (n_read > 0)
{
buf->str[buf->len += n_read] = '\0';
return IRC_READ_OK;
}
if (n_read == 0)
return IRC_READ_EOF;
if (errno == EAGAIN)
return IRC_READ_AGAIN;
if (errno == EINTR)
goto start;
LOG_LIBC_FAILURE ("recv");
return IRC_READ_ERROR;
}
static bool irc_connect (struct server *s, struct error **);
static void irc_queue_reconnect (struct server *s);
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);
}
static void
on_irc_reconnect_timeout (void *user_data)
{
struct server *s = user_data;
struct error *e = NULL;
if (irc_connect (s, &e))
return;
buffer_send_error (s->ctx, s->buffer, "%s", e->message);
error_free (e);
irc_queue_reconnect (s);
}
static void
irc_queue_reconnect (struct server *s)
{
// TODO: exponentional backoff
hard_assert (s->irc_fd == -1);
buffer_send_status (s->ctx, s->buffer,
"Trying to reconnect in %ld seconds...", s->ctx->reconnect_delay);
poller_timer_set (&s->reconnect_tmr, s->ctx->reconnect_delay * 1000);
}
static void
on_irc_disconnected (struct server *s)
{
// Get rid of the dead socket and related things
if (s->ssl)
{
SSL_free (s->ssl);
s->ssl = NULL;
SSL_CTX_free (s->ssl_ctx);
s->ssl_ctx = NULL;
}
xclose (s->irc_fd);
s->irc_fd = -1;
s->irc_ready = false;
user_unref (s->irc_user);
s->irc_user = NULL;
free (s->irc_user_mode);
s->irc_user_mode = NULL;
free (s->irc_user_host);
s->irc_user_host = NULL;
s->irc_event.closed = true;
poller_fd_reset (&s->irc_event);
// All of our timers have lost their meaning now
irc_cancel_timers (s);
if (s->ctx->quitting)
try_finish_quit (s->ctx);
else if (!s->ctx->reconnect)
// XXX: not sure if we want this in a client
// FIXME: no, we don't, would need to be changed for multiserver anyway
initiate_quit (s->ctx);
else
irc_queue_reconnect (s);
}
static void
on_irc_ping_timeout (void *user_data)
{
struct server *s = user_data;
buffer_send_error (s->ctx, s->buffer, "Connection timeout");
on_irc_disconnected (s);
}
static void
on_irc_timeout (void *user_data)
{
// Provoke a response from the server
struct server *s = user_data;
irc_send (s, "PING :%s",
(char *) str_map_find (&s->ctx->config, "nickname"));
}
static void
irc_reset_connection_timeouts (struct server *s)
{
irc_cancel_timers (s);
poller_timer_set (&s->timeout_tmr, 3 * 60 * 1000);
poller_timer_set (&s->ping_tmr, (3 * 60 + 30) * 1000);
}
static void
on_irc_readable (const struct pollfd *fd, struct server *s)
{
if (fd->revents & ~(POLLIN | POLLHUP | POLLERR))
print_debug ("fd %d: unexpected revents: %d", fd->fd, fd->revents);
(void) set_blocking (s->irc_fd, false);
struct str *buf = &s->read_buffer;
enum irc_read_result (*fill_buffer)(struct server *, struct str *)
= s->ssl
? irc_fill_read_buffer_ssl
: irc_fill_read_buffer;
bool disconnected = false;
while (true)
{
str_ensure_space (buf, 512);
switch (fill_buffer (s, buf))
{
case IRC_READ_AGAIN:
goto end;
case IRC_READ_ERROR:
buffer_send_error (s->ctx, s->buffer,
"Reading from the IRC server failed");
disconnected = true;
goto end;
case IRC_READ_EOF:
buffer_send_error (s->ctx, s->buffer,
"The IRC server closed the connection");
disconnected = true;
goto end;
case IRC_READ_OK:
break;
}
if (buf->len >= (1 << 20))
{
buffer_send_error (s->ctx, s->buffer,
"The IRC server seems to spew out data frantically");
irc_shutdown (s);
goto end;
}
}
end:
(void) set_blocking (s->irc_fd, true);
irc_process_buffer (buf, irc_process_message, s);
if (disconnected)
on_irc_disconnected (s);
else
irc_reset_connection_timeouts (s);
}
static bool
irc_connect (struct server *s, struct error **e)
{
struct app_context *ctx = s->ctx;
const char *irc_host = str_map_find (&ctx->config, "irc_host");
const char *irc_port = str_map_find (&ctx->config, "irc_port");
const char *socks_host = str_map_find (&ctx->config, "socks_host");
const char *socks_port = str_map_find (&ctx->config, "socks_port");
const char *socks_username = str_map_find (&ctx->config, "socks_username");
const char *socks_password = str_map_find (&ctx->config, "socks_password");
const char *nickname = str_map_find (&ctx->config, "nickname");
const char *username = str_map_find (&ctx->config, "username");
const char *realname = str_map_find (&ctx->config, "realname");
// We have a default value for these
hard_assert (irc_port && socks_port);
// These are filled automatically if needed
hard_assert (nickname && username && realname);
// TODO: again, get rid of `struct error' in here. The question is: how
// do we tell our caller that he should not try to reconnect?
bool use_ssl;
if (!irc_get_boolean_from_config (ctx, "ssl", &use_ssl, e))
return false;
if (socks_host)
{
char *address = format_host_port_pair (irc_host, irc_port);
char *socks_address = format_host_port_pair (socks_host, socks_port);
buffer_send_status (ctx, s->buffer,
"Connecting to %s via %s...", address, socks_address);
free (socks_address);
free (address);
struct error *error = NULL;
int fd = socks_connect (socks_host, socks_port, irc_host, irc_port,
socks_username, socks_password, &error);
if (fd == -1)
{
error_set (e, "%s: %s", "SOCKS connection failed", error->message);
error_free (error);
return false;
}
s->irc_fd = fd;
}
else if (!irc_establish_connection (s, irc_host, irc_port, e))
return false;
if (use_ssl && !irc_initialize_ssl (s, e))
{
xclose (s->irc_fd);
s->irc_fd = -1;
return false;
}
buffer_send_status (ctx, s->buffer, "Connection established");
poller_fd_init (&s->irc_event, &ctx->poller, s->irc_fd);
s->irc_event.dispatcher = (poller_fd_fn) on_irc_readable;
s->irc_event.user_data = s;
poller_fd_set (&s->irc_event, POLLIN);
irc_reset_connection_timeouts (s);
irc_send (s, "NICK %s", nickname);
irc_send (s, "USER %s 8 * :%s", username, realname);
// XXX: maybe we should wait for the first message from the server
// FIXME: the user may exist already after we've reconnected. Either
// make sure that there's no reference of this nick upon disconnection,
// or search in "irc_users" first... or something.
s->irc_user = irc_make_user (s, xstrdup (nickname));
s->irc_user_mode = xstrdup ("");
s->irc_user_host = NULL;
return true;
}
// --- I/O event handlers ------------------------------------------------------
static void
on_signal_pipe_readable (const struct pollfd *fd, struct app_context *ctx)
{
char dummy;
(void) read (fd->fd, &dummy, 1);
if (g_termination_requested && !ctx->quitting)
{
// There may be a timer set to reconnect to the server
// TODO: multiserver
struct server *s = &ctx->server;
// TODO: a faster timer for quitting
irc_reset_connection_timeouts (s);
// FIXME: use a normal quit message
if (s->irc_fd != -1)
irc_send (s, "QUIT :Terminated by signal");
initiate_quit (ctx);
}
if (g_winch_received)
{
// 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 ();
rl_get_screen_size (&ctx->lines, &ctx->columns);
}
}
static void
on_tty_readable (const struct pollfd *fd, struct app_context *ctx)
{
(void) ctx;
if (fd->revents & ~(POLLIN | POLLHUP | POLLERR))
print_debug ("fd %d: unexpected revents: %d", fd->fd, fd->revents);
rl_callback_read_char ();
}
static void
on_readline_input (char *line)
{
if (line)
{
if (*line)
add_history (line);
process_input (g_ctx, line);
free (line);
}
else
{
app_readline_erase_to_bol (g_ctx->readline_prompt);
rl_ding ();
}
// initiate_quit() disables readline; we just wait then
if (!g_ctx->quitting)
g_ctx->readline_prompt_shown = true;
}
// --- Configuration loading ---------------------------------------------------
static bool
read_hexa_escape (const char **cursor, struct str *output)
{
int i;
char c, code = 0;
for (i = 0; i < 2; i++)
{
c = tolower (*(*cursor));
if (c >= '0' && c <= '9')
code = (code << 4) | (c - '0');
else if (c >= 'a' && c <= 'f')
code = (code << 4) | (c - 'a' + 10);
else
break;
(*cursor)++;
}
if (!i)
return false;
str_append_c (output, code);
return true;
}
static bool
read_octal_escape (const char **cursor, struct str *output)
{
int i;
char c, code = 0;
for (i = 0; i < 3; i++)
{
c = *(*cursor);
if (c < '0' || c > '7')
break;
code = (code << 3) | (c - '0');
(*cursor)++;
}
if (!i)
return false;
str_append_c (output, code);
return true;
}
static bool
read_string_escape_sequence (const char **cursor,
struct str *output, struct error **e)
{
int c;
switch ((c = *(*cursor)++))
{
case '?': str_append_c (output, '?'); break;
case '"': str_append_c (output, '"'); break;
case '\\': str_append_c (output, '\\'); break;
case 'a': str_append_c (output, '\a'); break;
case 'b': str_append_c (output, '\b'); break;
case 'f': str_append_c (output, '\f'); break;
case 'n': str_append_c (output, '\n'); break;
case 'r': str_append_c (output, '\r'); break;
case 't': str_append_c (output, '\t'); break;
case 'v': str_append_c (output, '\v'); break;
case 'e':
case 'E':
str_append_c (output, '\x1b');
break;
case 'x':
case 'X':
if (!read_hexa_escape (cursor, output))
FAIL ("invalid hexadecimal escape");
break;
case '\0':
FAIL ("premature end of escape sequence");
default:
(*cursor)--;
if (!read_octal_escape (cursor, output))
FAIL ("unknown escape sequence");
}
return true;
}
static bool
unescape_string (const char *s, struct str *output, struct error **e)
{
int c;
while ((c = *s++))
{
if (c != '\\')
str_append_c (output, c);
else if (!read_string_escape_sequence (&s, output, e))
return false;
}
return true;
}
static bool
autofill_user_info (struct app_context *ctx, struct error **e)
{
const char *nickname = str_map_find (&ctx->config, "nickname");
const char *username = str_map_find (&ctx->config, "username");
const char *realname = str_map_find (&ctx->config, "realname");
if (nickname && username && realname)
return true;
// Read POSIX user info and fill the configuration if needed
struct passwd *pwd = getpwuid (geteuid ());
if (!pwd)
FAIL ("cannot retrieve user information: %s", strerror (errno));
if (!nickname)
str_map_set (&ctx->config, "nickname", xstrdup (pwd->pw_name));
if (!username)
str_map_set (&ctx->config, "username", xstrdup (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';
str_map_set (&ctx->config, "realname", xstrdup (gecos));
}
return true;
}
static bool
unescape_config (struct str_map *input, struct str_map *output, struct error **e)
{
struct error *error = NULL;
struct str_map_iter iter;
str_map_iter_init (&iter, input);
while (str_map_iter_next (&iter))
{
struct str value;
str_init (&value);
if (!unescape_string (iter.link->data, &value, &error))
{
error_set (e, "error reading configuration: %s: %s",
iter.link->key, error->message);
error_free (error);
return false;
}
str_map_set (output, iter.link->key, str_steal (&value));
}
return true;
}
static bool
load_config (struct app_context *ctx, struct error **e)
{
// TODO: employ a better configuration file format, so that we don't have
// to do this convoluted post-processing anymore.
struct str_map map;
str_map_init (&map);
map.free = free;
bool success = read_config_file (&map, e) &&
unescape_config (&map, &ctx->config, e) &&
autofill_user_info (ctx, e);
str_map_free (&map);
if (!success)
return false;
const char *irc_host = str_map_find (&ctx->config, "irc_host");
if (!irc_host)
{
error_set (e, "no hostname specified in configuration");
return false;
}
if (!irc_get_boolean_from_config (ctx,
"reconnect", &ctx->reconnect, e)
|| !irc_get_boolean_from_config (ctx,
"isolate_buffers", &ctx->isolate_buffers, e))
return false;
const char *delay_str = str_map_find (&ctx->config, "reconnect_delay");
hard_assert (delay_str != NULL); // We have a default value for this
if (!xstrtoul (&ctx->reconnect_delay, delay_str, 10))
{
error_set (e, "invalid configuration value for `%s'",
"reconnect_delay");
return false;
}
return true;
}
// --- Main program ------------------------------------------------------------
static void
init_poller_events (struct app_context *ctx)
{
poller_fd_init (&ctx->signal_event, &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);
poller_fd_init (&ctx->tty_event, &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);
}
int
main (int argc, char *argv[])
{
// We include a generated file from kike 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[] =
{
{ 'd', "debug", NULL, 0, "run in debug mode" },
{ 'h', "help", NULL, 0, "display this help and exit" },
{ 'V', "version", NULL, 0, "output version information and exit" },
{ 'w', "write-default-cfg", "FILENAME",
OPT_OPTIONAL_ARG | OPT_LONG_ONLY,
"write a default configuration file and exit" },
{ 0, NULL, NULL, 0, NULL }
};
struct opt_handler oh;
opt_handler_init (&oh, argc, argv, opts, NULL, "Experimental IRC client.");
int c;
while ((c = opt_handler_get (&oh)) != -1)
switch (c)
{
case 'd':
g_debug_mode = true;
break;
case 'h':
opt_handler_usage (&oh, stdout);
exit (EXIT_SUCCESS);
case 'V':
printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
exit (EXIT_SUCCESS);
case 'w':
call_write_default_config (optarg, g_config_table);
exit (EXIT_SUCCESS);
default:
print_error ("wrong options");
opt_handler_usage (&oh, stderr);
exit (EXIT_FAILURE);
}
opt_handler_free (&oh);
print_status (PROGRAM_NAME " " PROGRAM_VERSION " starting");
// 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;
SSL_library_init ();
atexit (EVP_cleanup);
SSL_load_error_strings ();
atexit (ERR_free_strings);
using_history ();
// This can cause memory leaks, or maybe even a segfault. Funny, eh?
stifle_history (HISTORY_LIMIT);
setup_signal_handlers ();
struct error *e = NULL;
if (!load_config (&ctx, &e))
{
print_error ("%s", e->message);
error_free (e);
exit (EXIT_FAILURE);
}
init_colors (&ctx);
init_poller_events (&ctx);
init_buffers (&ctx);
ctx.current_buffer = ctx.server.buffer;
refresh_prompt (&ctx);
// TODO: connect asynchronously (first step towards multiple servers)
if (!irc_connect (&ctx.server, &e))
{
buffer_send_error (&ctx, ctx.server.buffer, "%s", e->message);
error_free (e);
exit (EXIT_FAILURE);
}
rl_startup_hook = init_readline;
rl_catch_sigwinch = false;
rl_callback_handler_install (ctx.readline_prompt, on_readline_input);
rl_get_screen_size (&ctx.lines, &ctx.columns);
ctx.readline_prompt_shown = true;
ctx.polling = true;
while (ctx.polling)
poller_run (&ctx.poller);
app_context_free (&ctx);
free_terminal ();
return EXIT_SUCCESS;
}
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