Přemysl Eric Janouch
32c99c9d66
A most unfortunate 06d3b3b regression, mostly stemming from
forgetting why the `break` was in place and not documenting it.
4080 lines
114 KiB
C
4080 lines
114 KiB
C
/*
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* kike.c: an IRC daemon
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*
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* Copyright (c) 2014 - 2020, Přemysl Eric Janouch <p@janouch.name>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include "config.h"
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#define PROGRAM_NAME "kike"
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#define WANT_SYSLOG_LOGGING
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#include "common.c"
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#include "kike-replies.c"
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#include <nl_types.h>
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enum { PIPE_READ, PIPE_WRITE };
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// FIXME: don't use time_t to compute time deltas
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// --- Configuration (application-specific) ------------------------------------
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// Just get rid of the crappiest ciphers available by default
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#define DEFAULT_CIPHERS "DEFAULT:!MEDIUM:!LOW"
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static struct simple_config_item g_config_table[] =
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{
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{ "pid_file", NULL, "Path or name of the PID file" },
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{ "server_name", NULL, "Server name" },
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{ "server_info", "My server", "Brief server description" },
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{ "motd", NULL, "MOTD filename" },
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{ "catalog", NULL, "catgets localization catalog" },
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{ "bind_host", NULL, "Address of the IRC server" },
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{ "bind_port", "6667", "Port of the IRC server" },
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{ "tls_cert", NULL, "Server TLS certificate (PEM)" },
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{ "tls_key", NULL, "Server TLS private key (PEM)" },
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{ "tls_ciphers", DEFAULT_CIPHERS, "OpenSSL cipher list" },
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{ "operators", NULL, "IRCop TLS client cert. SHA-1 fingerprints" },
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{ "max_connections", "0", "Global connection limit" },
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{ "ping_interval", "180", "Interval between PINGs (sec)" },
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{ NULL, NULL, NULL }
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};
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// --- Signals -----------------------------------------------------------------
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static int g_signal_pipe[2]; ///< A pipe used to signal... signals
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/// Program termination has been requested by a signal
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static volatile sig_atomic_t g_termination_requested;
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static void
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sigterm_handler (int signum)
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{
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(void) signum;
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g_termination_requested = true;
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int original_errno = errno;
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if (write (g_signal_pipe[1], "t", 1) == -1)
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soft_assert (errno == EAGAIN);
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errno = original_errno;
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}
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static void
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setup_signal_handlers (void)
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{
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if (pipe (g_signal_pipe) == -1)
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exit_fatal ("%s: %s", "pipe", strerror (errno));
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set_cloexec (g_signal_pipe[0]);
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set_cloexec (g_signal_pipe[1]);
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// So that the pipe cannot overflow; it would make write() block within
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// the signal handler, which is something we really don't want to happen.
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// The same holds true for read().
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set_blocking (g_signal_pipe[0], false);
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set_blocking (g_signal_pipe[1], false);
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signal (SIGPIPE, SIG_IGN);
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struct sigaction sa;
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sa.sa_flags = SA_RESTART;
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sigemptyset (&sa.sa_mask);
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sa.sa_handler = sigterm_handler;
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if (sigaction (SIGINT, &sa, NULL) == -1
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|| sigaction (SIGTERM, &sa, NULL) == -1)
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exit_fatal ("%s: %s", "sigaction", strerror (errno));
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}
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// --- Rate limiter ------------------------------------------------------------
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struct flood_detector
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{
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unsigned interval; ///< Interval for the limit
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unsigned limit; ///< Maximum number of events allowed
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time_t *timestamps; ///< Timestamps of last events
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unsigned pos; ///< Index of the oldest event
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};
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static void
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flood_detector_init (struct flood_detector *self,
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unsigned interval, unsigned limit)
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{
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self->interval = interval;
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self->limit = limit;
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self->timestamps = xcalloc (limit + 1, sizeof *self->timestamps);
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self->pos = 0;
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}
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static void
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flood_detector_free (struct flood_detector *self)
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{
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free (self->timestamps);
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}
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static bool
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flood_detector_check (struct flood_detector *self)
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{
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time_t now = time (NULL);
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self->timestamps[self->pos++] = now;
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if (self->pos > self->limit)
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self->pos = 0;
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time_t begin = now - self->interval;
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size_t count = 0;
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for (size_t i = 0; i <= self->limit; i++)
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if (self->timestamps[i] >= begin)
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count++;
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return count <= self->limit;
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}
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// --- IRC token validation ----------------------------------------------------
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// Use the enum only if applicable and a simple boolean isn't sufficient.
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enum validation_result
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{
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VALIDATION_OK,
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VALIDATION_ERROR_EMPTY,
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VALIDATION_ERROR_TOO_LONG,
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VALIDATION_ERROR_INVALID
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};
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// Everything as per RFC 2812
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#define IRC_MAX_NICKNAME 9
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#define IRC_MAX_HOSTNAME 63
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#define IRC_MAX_CHANNEL_NAME 50
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#define IRC_MAX_MESSAGE_LENGTH 510
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static bool
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irc_regex_match (const char *regex, const char *s)
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{
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static struct str_map cache;
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static bool initialized;
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if (!initialized)
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{
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cache = regex_cache_make ();
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initialized = true;
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}
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struct error *e = NULL;
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bool result = regex_cache_match (&cache, regex,
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REG_EXTENDED | REG_NOSUB, s, &e);
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hard_assert (!e);
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return result;
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}
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static const char *
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irc_validate_to_str (enum validation_result result)
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{
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switch (result)
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{
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case VALIDATION_OK: return "success";
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case VALIDATION_ERROR_EMPTY: return "the value is empty";
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case VALIDATION_ERROR_INVALID: return "invalid format";
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case VALIDATION_ERROR_TOO_LONG: return "the value is too long";
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default: abort ();
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}
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}
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// Anything to keep it as short as possible
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// "shortname" from RFC 2812 doesn't work how its author thought it would.
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#define SN "[0-9A-Za-z](-*[0-9A-Za-z])*"
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#define N4 "[0-9]{1,3}"
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#define N6 "[0-9ABCDEFabcdef]{1,}"
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#define LE "A-Za-z"
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#define SP "][\\\\`_^{|}"
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static enum validation_result
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irc_validate_hostname (const char *hostname)
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{
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if (!*hostname)
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return VALIDATION_ERROR_EMPTY;
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if (!irc_regex_match ("^" SN "(\\." SN ")*$", hostname))
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return VALIDATION_ERROR_INVALID;
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if (strlen (hostname) > IRC_MAX_HOSTNAME)
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return VALIDATION_ERROR_TOO_LONG;
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return VALIDATION_OK;
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}
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static bool
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irc_is_valid_hostaddr (const char *hostaddr)
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{
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if (irc_regex_match ("^" N4 "\\." N4 "\\." N4 "\\." N4 "$", hostaddr)
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|| irc_regex_match ("^" N6 ":" N6 ":" N6 ":" N6 ":"
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N6 ":" N6 ":" N6 ":" N6 "$", hostaddr)
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|| irc_regex_match ("^0:0:0:0:0:(0|[Ff]{4}):"
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N4 "\\." N4 "\\." N4 "\\." N4 "$", hostaddr))
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return true;
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return false;
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}
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// TODO: we should actually use this, though what should we do on failure?
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static bool
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irc_is_valid_host (const char *host)
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{
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return irc_validate_hostname (host) == VALIDATION_OK
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|| irc_is_valid_hostaddr (host);
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}
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// TODO: currently, we are almost encoding-agnostic (strings just need to be
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// ASCII-compatible). We should at least have an option to enforce a specific
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// encoding, such as UTF-8. Note that with Unicode we should not allow all
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// character clasess and exclude the likes of \pM with the goal of enforcing
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// NFC-normalized identifiers--utf8proc is a good candidate library to handle
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// the categorization and validation.
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static bool
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irc_is_valid_user (const char *user)
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{
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return irc_regex_match ("^[^\r\n @]+$", user);
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}
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static bool
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irc_validate_nickname (const char *nickname)
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{
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if (!*nickname)
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return VALIDATION_ERROR_EMPTY;
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if (!irc_regex_match ("^[" SP LE "][" SP LE "0-9-]*$", nickname))
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return VALIDATION_ERROR_INVALID;
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if (strlen (nickname) > IRC_MAX_NICKNAME)
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return VALIDATION_ERROR_TOO_LONG;
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return VALIDATION_OK;
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}
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static enum validation_result
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irc_validate_channel_name (const char *channel_name)
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{
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if (!*channel_name)
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return VALIDATION_ERROR_EMPTY;
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if (*channel_name != '#' || strpbrk (channel_name, "\7\r\n ,:"))
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return VALIDATION_ERROR_INVALID;
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if (strlen (channel_name) > IRC_MAX_CHANNEL_NAME)
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return VALIDATION_ERROR_TOO_LONG;
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return VALIDATION_OK;
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}
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static bool
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irc_is_valid_key (const char *key)
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{
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// XXX: should be 7-bit as well but whatever
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return irc_regex_match ("^[^\r\n\f\t\v ]{1,23}$", key);
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}
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#undef SN
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#undef N4
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#undef N6
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#undef LE
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#undef SP
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static bool
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irc_is_valid_user_mask (const char *mask)
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{
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return irc_regex_match ("^[^!@]+![^!@]+@[^@!]+$", mask);
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}
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static bool
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irc_is_valid_fingerprint (const char *fp)
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{
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return irc_regex_match ("^[a-fA-F0-9]{40}$", fp);
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}
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// --- Clients (equals users) --------------------------------------------------
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#define IRC_SUPPORTED_USER_MODES "aiwros"
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enum
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{
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IRC_USER_MODE_INVISIBLE = (1 << 0),
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IRC_USER_MODE_RX_WALLOPS = (1 << 1),
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IRC_USER_MODE_RESTRICTED = (1 << 2),
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IRC_USER_MODE_OPERATOR = (1 << 3),
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IRC_USER_MODE_RX_SERVER_NOTICES = (1 << 4)
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};
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enum
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{
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IRC_CAP_MULTI_PREFIX = (1 << 0),
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IRC_CAP_INVITE_NOTIFY = (1 << 1),
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IRC_CAP_ECHO_MESSAGE = (1 << 2),
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IRC_CAP_USERHOST_IN_NAMES = (1 << 3),
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IRC_CAP_SERVER_TIME = (1 << 4)
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};
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struct client
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{
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LIST_HEADER (struct client)
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struct server_context *ctx; ///< Server context
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time_t opened; ///< When the connection was opened
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size_t n_sent_messages; ///< Number of sent messages total
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size_t sent_bytes; ///< Number of sent bytes total
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size_t n_received_messages; ///< Number of received messages total
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size_t received_bytes; ///< Number of received bytes total
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int socket_fd; ///< The TCP socket
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struct str read_buffer; ///< Unprocessed input
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struct str write_buffer; ///< Output yet to be sent out
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struct poller_fd socket_event; ///< The socket can be read/written to
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struct poller_timer ping_timer; ///< We should send a ping
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struct poller_timer timeout_timer; ///< Connection seems to be dead
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struct poller_timer kill_timer; ///< Hard kill timeout
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unsigned long cap_version; ///< CAP protocol version
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unsigned caps_enabled; ///< Enabled capabilities
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unsigned initialized : 1; ///< Has any data been received yet?
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unsigned cap_negotiating : 1; ///< Negotiating capabilities
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unsigned registered : 1; ///< The user has registered
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unsigned closing_link : 1; ///< Closing link
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unsigned half_closed : 1; ///< Closing link: conn. is half-closed
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unsigned ssl_rx_want_tx : 1; ///< SSL_read() wants to write
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unsigned ssl_tx_want_rx : 1; ///< SSL_write() wants to read
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SSL *ssl; ///< SSL connection
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char *ssl_cert_fingerprint; ///< Client certificate fingerprint
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char *nickname; ///< IRC nickname (main identifier)
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char *username; ///< IRC username
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char *realname; ///< IRC realname (e-mail)
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char *hostname; ///< Hostname shown to the network
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char *port; ///< Port of the peer as a string
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char *address; ///< Full address
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unsigned mode; ///< User's mode
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char *away_message; ///< Away message
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time_t last_active; ///< Last PRIVMSG, to get idle time
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struct str_map invites; ///< Channel invitations by operators
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struct flood_detector antiflood; ///< Flood detector
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struct async_getnameinfo *gni; ///< Backwards DNS resolution
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struct poller_timer gni_timer; ///< Backwards DNS resolution timeout
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};
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static struct client *
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client_new (void)
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{
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struct client *self = xcalloc (1, sizeof *self);
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self->socket_fd = -1;
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self->read_buffer = str_make ();
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self->write_buffer = str_make ();
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self->cap_version = 301;
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// TODO: make this configurable and more fine-grained
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flood_detector_init (&self->antiflood, 10, 20);
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self->invites = str_map_make (NULL);
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self->invites.key_xfrm = irc_strxfrm;
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return self;
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}
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static void
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client_destroy (struct client *self)
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{
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if (!soft_assert (self->socket_fd == -1))
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xclose (self->socket_fd);
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if (self->ssl)
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SSL_free (self->ssl);
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str_free (&self->read_buffer);
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str_free (&self->write_buffer);
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free (self->ssl_cert_fingerprint);
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free (self->nickname);
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free (self->username);
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free (self->realname);
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free (self->hostname);
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free (self->port);
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free (self->address);
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free (self->away_message);
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flood_detector_free (&self->antiflood);
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str_map_free (&self->invites);
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if (self->gni)
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async_cancel (&self->gni->async);
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free (self);
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}
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static void client_close_link (struct client *c, const char *reason);
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static void client_kill (struct client *c, const char *reason);
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static void client_send (struct client *, const char *, ...)
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ATTRIBUTE_PRINTF (2, 3);
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static void client_cancel_timers (struct client *);
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static void client_set_kill_timer (struct client *);
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static void client_update_poller (struct client *, const struct pollfd *);
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// --- Channels ----------------------------------------------------------------
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#define IRC_SUPPORTED_CHAN_MODES "ov" "beI" "imnqpst" "kl"
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enum
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{
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IRC_CHAN_MODE_INVITE_ONLY = (1 << 0),
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IRC_CHAN_MODE_MODERATED = (1 << 1),
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IRC_CHAN_MODE_NO_OUTSIDE_MSGS = (1 << 2),
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IRC_CHAN_MODE_QUIET = (1 << 3),
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IRC_CHAN_MODE_PRIVATE = (1 << 4),
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IRC_CHAN_MODE_SECRET = (1 << 5),
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IRC_CHAN_MODE_PROTECTED_TOPIC = (1 << 6),
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IRC_CHAN_MODE_OPERATOR = (1 << 7),
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IRC_CHAN_MODE_VOICE = (1 << 8)
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};
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struct channel_user
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{
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LIST_HEADER (struct channel_user)
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unsigned modes;
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struct client *c;
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};
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struct channel
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{
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struct server_context *ctx; ///< Server context
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char *name; ///< Channel name
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unsigned modes; ///< Channel modes
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char *key; ///< Channel key
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long user_limit; ///< User limit or -1
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time_t created; ///< Creation time
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char *topic; ///< Channel topic
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char *topic_who; ///< Who set the topic
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time_t topic_time; ///< When the topic was set
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struct channel_user *users; ///< Channel users
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struct strv ban_list; ///< Ban list
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struct strv exception_list; ///< Exceptions from bans
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struct strv invite_list; ///< Exceptions from +I
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};
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static struct channel *
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channel_new (void)
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{
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struct channel *self = xcalloc (1, sizeof *self);
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self->user_limit = -1;
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self->topic = xstrdup ("");
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self->ban_list = strv_make ();
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self->exception_list = strv_make ();
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self->invite_list = strv_make ();
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return self;
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}
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static void
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channel_delete (struct channel *self)
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{
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free (self->name);
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free (self->key);
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free (self->topic);
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free (self->topic_who);
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struct channel_user *link, *tmp;
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for (link = self->users; link; link = tmp)
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{
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tmp = link->next;
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free (link);
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}
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strv_free (&self->ban_list);
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strv_free (&self->exception_list);
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strv_free (&self->invite_list);
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free (self);
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}
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static char *
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channel_get_mode (struct channel *self, bool disclose_secrets)
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{
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struct str mode = str_make ();
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unsigned m = self->modes;
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if (m & IRC_CHAN_MODE_INVITE_ONLY) str_append_c (&mode, 'i');
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if (m & IRC_CHAN_MODE_MODERATED) str_append_c (&mode, 'm');
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if (m & IRC_CHAN_MODE_NO_OUTSIDE_MSGS) str_append_c (&mode, 'n');
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if (m & IRC_CHAN_MODE_QUIET) str_append_c (&mode, 'q');
|
|
if (m & IRC_CHAN_MODE_PRIVATE) str_append_c (&mode, 'p');
|
|
if (m & IRC_CHAN_MODE_SECRET) str_append_c (&mode, 's');
|
|
if (m & IRC_CHAN_MODE_PROTECTED_TOPIC) str_append_c (&mode, 't');
|
|
|
|
if (self->user_limit != -1) str_append_c (&mode, 'l');
|
|
if (self->key) str_append_c (&mode, 'k');
|
|
|
|
// XXX: is it correct to split it? Try it on an existing implementation.
|
|
if (disclose_secrets)
|
|
{
|
|
if (self->user_limit != -1)
|
|
str_append_printf (&mode, " %ld", self->user_limit);
|
|
if (self->key)
|
|
str_append_printf (&mode, " %s", self->key);
|
|
}
|
|
return str_steal (&mode);
|
|
}
|
|
|
|
static struct channel_user *
|
|
channel_get_user (const struct channel *chan, const struct client *c)
|
|
{
|
|
for (struct channel_user *iter = chan->users; iter; iter = iter->next)
|
|
if (iter->c == c)
|
|
return iter;
|
|
return NULL;
|
|
}
|
|
|
|
static struct channel_user *
|
|
channel_add_user (struct channel *chan, struct client *c)
|
|
{
|
|
struct channel_user *link = xcalloc (1, sizeof *link);
|
|
link->c = c;
|
|
LIST_PREPEND (chan->users, link);
|
|
return link;
|
|
}
|
|
|
|
static void
|
|
channel_remove_user (struct channel *chan, struct channel_user *user)
|
|
{
|
|
LIST_UNLINK (chan->users, user);
|
|
free (user);
|
|
}
|
|
|
|
static size_t
|
|
channel_user_count (const struct channel *chan)
|
|
{
|
|
size_t result = 0;
|
|
for (struct channel_user *iter = chan->users; iter; iter = iter->next)
|
|
result++;
|
|
return result;
|
|
}
|
|
|
|
// --- IRC server context ------------------------------------------------------
|
|
|
|
struct whowas_info
|
|
{
|
|
char *nickname; ///< IRC nickname
|
|
char *username; ///< IRC username
|
|
char *realname; ///< IRC realname
|
|
char *hostname; ///< Hostname shown to the network
|
|
};
|
|
|
|
struct whowas_info *
|
|
whowas_info_new (struct client *c)
|
|
{
|
|
struct whowas_info *self = xmalloc (sizeof *self);
|
|
self->nickname = xstrdup (c->nickname);
|
|
self->username = xstrdup (c->username);
|
|
self->realname = xstrdup (c->realname);
|
|
self->hostname = xstrdup (c->hostname);
|
|
return self;
|
|
}
|
|
|
|
static void
|
|
whowas_info_destroy (struct whowas_info *self)
|
|
{
|
|
free (self->nickname);
|
|
free (self->username);
|
|
free (self->realname);
|
|
free (self->hostname);
|
|
free (self);
|
|
}
|
|
|
|
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
|
|
struct irc_command
|
|
{
|
|
const char *name;
|
|
bool requires_registration;
|
|
void (*handler) (const struct irc_message *, struct client *);
|
|
|
|
size_t n_received; ///< Number of commands received
|
|
size_t bytes_received; ///< Number of bytes received total
|
|
};
|
|
|
|
struct server_context
|
|
{
|
|
int *listen_fds; ///< Listening socket FD's
|
|
struct poller_fd *listen_events; ///< New connections available
|
|
size_t listen_len; ///< Number of listening sockets
|
|
size_t listen_alloc; ///< How many we've allocated
|
|
|
|
time_t started; ///< When has the server been started
|
|
|
|
SSL_CTX *ssl_ctx; ///< SSL context
|
|
struct client *clients; ///< Clients
|
|
unsigned n_clients; ///< Current number of connections
|
|
|
|
struct str_map users; ///< Maps nicknames to clients
|
|
struct str_map channels; ///< Maps channel names to data
|
|
struct str_map handlers; ///< Message handlers
|
|
struct str_map cap_handlers; ///< CAP message handlers
|
|
|
|
struct str_map whowas; ///< WHOWAS registry
|
|
|
|
struct poller poller; ///< Manages polled description
|
|
struct poller_timer quit_timer; ///< Quit timeout timer
|
|
bool quitting; ///< User requested quitting
|
|
bool polling; ///< The event loop is running
|
|
|
|
struct poller_fd signal_event; ///< Got a signal
|
|
|
|
struct str_map config; ///< Server configuration
|
|
char *server_name; ///< Our server name
|
|
unsigned ping_interval; ///< Ping interval in seconds
|
|
unsigned max_connections; ///< Max. connections allowed or 0
|
|
struct strv motd; ///< MOTD (none if empty)
|
|
nl_catd catalog; ///< Message catalog for server msgs
|
|
struct str_map operators; ///< TLS cert. fingerprints for IRCops
|
|
};
|
|
|
|
static void
|
|
on_irc_quit_timeout (void *user_data)
|
|
{
|
|
struct server_context *ctx = user_data;
|
|
struct client *iter, *next;
|
|
for (iter = ctx->clients; iter; iter = next)
|
|
{
|
|
next = iter->next;
|
|
// irc_initiate_quit() has already unregistered the client
|
|
client_kill (iter, "Shutting down");
|
|
}
|
|
}
|
|
|
|
static void
|
|
server_context_init (struct server_context *self)
|
|
{
|
|
memset (self, 0, sizeof *self);
|
|
|
|
self->users = str_map_make (NULL);
|
|
self->users.key_xfrm = irc_strxfrm;
|
|
self->channels = str_map_make ((str_map_free_fn) channel_delete);
|
|
self->channels.key_xfrm = irc_strxfrm;
|
|
self->handlers = str_map_make (NULL);
|
|
self->handlers.key_xfrm = irc_strxfrm;
|
|
self->cap_handlers = str_map_make (NULL);
|
|
self->cap_handlers.key_xfrm = irc_strxfrm;
|
|
|
|
self->whowas = str_map_make ((str_map_free_fn) whowas_info_destroy);
|
|
self->whowas.key_xfrm = irc_strxfrm;
|
|
|
|
poller_init (&self->poller);
|
|
self->quit_timer = poller_timer_make (&self->poller);
|
|
self->quit_timer.dispatcher = on_irc_quit_timeout;
|
|
self->quit_timer.user_data = self;
|
|
|
|
self->config = str_map_make (free);
|
|
simple_config_load_defaults (&self->config, g_config_table);
|
|
|
|
self->motd = strv_make ();
|
|
self->catalog = (nl_catd) -1;
|
|
self->operators = str_map_make (NULL);
|
|
// The regular irc_strxfrm() is sufficient for fingerprints
|
|
self->operators.key_xfrm = irc_strxfrm;
|
|
}
|
|
|
|
static void
|
|
server_context_free (struct server_context *self)
|
|
{
|
|
str_map_free (&self->config);
|
|
|
|
for (size_t i = 0; i < self->listen_len; i++)
|
|
{
|
|
poller_fd_reset (&self->listen_events[i]);
|
|
xclose (self->listen_fds[i]);
|
|
}
|
|
free (self->listen_fds);
|
|
free (self->listen_events);
|
|
|
|
hard_assert (!self->clients);
|
|
if (self->ssl_ctx)
|
|
SSL_CTX_free (self->ssl_ctx);
|
|
|
|
free (self->server_name);
|
|
str_map_free (&self->users);
|
|
str_map_free (&self->channels);
|
|
str_map_free (&self->handlers);
|
|
str_map_free (&self->cap_handlers);
|
|
str_map_free (&self->whowas);
|
|
poller_free (&self->poller);
|
|
|
|
strv_free (&self->motd);
|
|
if (self->catalog != (nl_catd) -1)
|
|
catclose (self->catalog);
|
|
str_map_free (&self->operators);
|
|
}
|
|
|
|
static const char *
|
|
irc_get_text (struct server_context *ctx, int id, const char *def)
|
|
{
|
|
if (!soft_assert (def != NULL))
|
|
def = "";
|
|
if (ctx->catalog == (nl_catd) -1)
|
|
return def;
|
|
return catgets (ctx->catalog, 1, id, def);
|
|
}
|
|
|
|
static void
|
|
irc_try_finish_quit (struct server_context *ctx)
|
|
{
|
|
if (!ctx->n_clients && ctx->quitting)
|
|
{
|
|
poller_timer_reset (&ctx->quit_timer);
|
|
ctx->polling = false;
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_initiate_quit (struct server_context *ctx)
|
|
{
|
|
print_status ("shutting down");
|
|
|
|
for (size_t i = 0; i < ctx->listen_len; i++)
|
|
{
|
|
poller_fd_reset (&ctx->listen_events[i]);
|
|
xclose (ctx->listen_fds[i]);
|
|
}
|
|
ctx->listen_len = 0;
|
|
|
|
for (struct client *iter = ctx->clients; iter; iter = iter->next)
|
|
if (!iter->closing_link)
|
|
client_close_link (iter, "Shutting down");
|
|
|
|
ctx->quitting = true;
|
|
poller_timer_set (&ctx->quit_timer, 5000);
|
|
irc_try_finish_quit (ctx);
|
|
}
|
|
|
|
static struct channel *
|
|
irc_channel_create (struct server_context *ctx, const char *name)
|
|
{
|
|
struct channel *chan = channel_new ();
|
|
chan->ctx = ctx;
|
|
chan->name = xstrdup (name);
|
|
chan->created = time (NULL);
|
|
str_map_set (&ctx->channels, name, chan);
|
|
return chan;
|
|
}
|
|
|
|
static void
|
|
irc_channel_destroy_if_empty (struct server_context *ctx, struct channel *chan)
|
|
{
|
|
if (!chan->users)
|
|
str_map_set (&ctx->channels, chan->name, NULL);
|
|
}
|
|
|
|
static void
|
|
irc_send_to_roommates (struct client *c, const char *message)
|
|
{
|
|
struct str_map targets = str_map_make (NULL);
|
|
targets.key_xfrm = irc_strxfrm;
|
|
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
|
|
struct channel *chan;
|
|
while ((chan = str_map_iter_next (&iter)))
|
|
{
|
|
if (chan->modes & IRC_CHAN_MODE_QUIET
|
|
|| !channel_get_user (chan, c))
|
|
continue;
|
|
for (struct channel_user *iter = chan->users; iter; iter = iter->next)
|
|
str_map_set (&targets, iter->c->nickname, iter->c);
|
|
}
|
|
|
|
iter = str_map_iter_make (&targets);
|
|
struct client *target;
|
|
while ((target = str_map_iter_next (&iter)))
|
|
if (target != c)
|
|
client_send (target, "%s", message);
|
|
str_map_free (&targets);
|
|
}
|
|
|
|
// --- Clients (continued) -----------------------------------------------------
|
|
|
|
static void
|
|
client_mode_to_str (unsigned m, struct str *out)
|
|
{
|
|
if (m & IRC_USER_MODE_INVISIBLE) str_append_c (out, 'i');
|
|
if (m & IRC_USER_MODE_RX_WALLOPS) str_append_c (out, 'w');
|
|
if (m & IRC_USER_MODE_RESTRICTED) str_append_c (out, 'r');
|
|
if (m & IRC_USER_MODE_OPERATOR) str_append_c (out, 'o');
|
|
if (m & IRC_USER_MODE_RX_SERVER_NOTICES) str_append_c (out, 's');
|
|
}
|
|
|
|
static char *
|
|
client_get_mode (struct client *self)
|
|
{
|
|
struct str mode = str_make ();
|
|
if (self->away_message)
|
|
str_append_c (&mode, 'a');
|
|
client_mode_to_str (self->mode, &mode);
|
|
return str_steal (&mode);
|
|
}
|
|
|
|
static void
|
|
client_send_str (struct client *c, const struct str *s)
|
|
{
|
|
hard_assert (!c->closing_link);
|
|
|
|
size_t old_sendq = c->write_buffer.len;
|
|
|
|
// So far there's only one message tag we use, so we can do it simple;
|
|
// note that a 1024-character limit applies to messages with tags on
|
|
if (c->caps_enabled & IRC_CAP_SERVER_TIME)
|
|
{
|
|
long milliseconds; char buf[32]; struct tm tm;
|
|
time_t now = unixtime_msec (&milliseconds);
|
|
if (soft_assert (strftime (buf, sizeof buf,
|
|
"%Y-%m-%dT%T", gmtime_r (&now, &tm))))
|
|
str_append_printf (&c->write_buffer,
|
|
"@time=%s.%03ldZ ", buf, milliseconds);
|
|
}
|
|
|
|
// TODO: kill the connection above some "SendQ" threshold (careful!)
|
|
str_append_data (&c->write_buffer, s->str,
|
|
MIN (s->len, IRC_MAX_MESSAGE_LENGTH));
|
|
str_append (&c->write_buffer, "\r\n");
|
|
// XXX: we might want to move this elsewhere, so that it doesn't get called
|
|
// as often; it's going to cause a lot of syscalls with epoll.
|
|
client_update_poller (c, NULL);
|
|
|
|
// Technically we haven't sent it yet but that's a minor detail
|
|
c->n_sent_messages++;
|
|
c->sent_bytes += c->write_buffer.len - old_sendq;
|
|
}
|
|
|
|
static void
|
|
client_send (struct client *c, const char *format, ...)
|
|
{
|
|
struct str tmp = str_make ();
|
|
|
|
va_list ap;
|
|
va_start (ap, format);
|
|
str_append_vprintf (&tmp, format, ap);
|
|
va_end (ap);
|
|
|
|
client_send_str (c, &tmp);
|
|
str_free (&tmp);
|
|
}
|
|
|
|
static void
|
|
client_add_to_whowas (struct client *c)
|
|
{
|
|
// Only keeping one entry for each nickname
|
|
// TODO: make sure this list doesn't get too long, for example by
|
|
// putting them in a linked list ordered by time
|
|
str_map_set (&c->ctx->whowas, c->nickname, whowas_info_new (c));
|
|
}
|
|
|
|
static void
|
|
client_unregister (struct client *c, const char *reason)
|
|
{
|
|
if (!c->registered)
|
|
return;
|
|
|
|
char *message = xstrdup_printf (":%s!%s@%s QUIT :%s",
|
|
c->nickname, c->username, c->hostname, reason);
|
|
irc_send_to_roommates (c, message);
|
|
free (message);
|
|
|
|
struct str_map_unset_iter iter =
|
|
str_map_unset_iter_make (&c->ctx->channels);
|
|
struct channel *chan;
|
|
while ((chan = str_map_unset_iter_next (&iter)))
|
|
{
|
|
struct channel_user *user;
|
|
if (!(user = channel_get_user (chan, c)))
|
|
continue;
|
|
channel_remove_user (chan, user);
|
|
irc_channel_destroy_if_empty (c->ctx, chan);
|
|
}
|
|
str_map_unset_iter_free (&iter);
|
|
|
|
client_add_to_whowas (c);
|
|
|
|
str_map_set (&c->ctx->users, c->nickname, NULL);
|
|
cstr_set (&c->nickname, NULL);
|
|
c->registered = false;
|
|
}
|
|
|
|
static void
|
|
client_kill (struct client *c, const char *reason)
|
|
{
|
|
struct server_context *ctx = c->ctx;
|
|
client_unregister (c, reason ? reason : "Client exited");
|
|
|
|
if (c->address)
|
|
// Only log the event if address resolution has finished
|
|
print_debug ("closed connection to %s (%s)", c->address,
|
|
reason ? reason : "");
|
|
|
|
if (c->ssl)
|
|
// Note that we might have already called this once, but that is fine
|
|
(void) SSL_shutdown (c->ssl);
|
|
|
|
xclose (c->socket_fd);
|
|
c->socket_fd = -1;
|
|
|
|
// We don't fork any children, this is okay
|
|
c->socket_event.closed = true;
|
|
poller_fd_reset (&c->socket_event);
|
|
client_cancel_timers (c);
|
|
|
|
LIST_UNLINK (ctx->clients, c);
|
|
ctx->n_clients--;
|
|
client_destroy (c);
|
|
|
|
irc_try_finish_quit (ctx);
|
|
}
|
|
|
|
static void
|
|
client_close_link (struct client *c, const char *reason)
|
|
{
|
|
// Let's just cut the connection, the client can try again later.
|
|
// We also want to avoid accidentally setting poller events before
|
|
// address resolution has finished.
|
|
if (!c->initialized)
|
|
{
|
|
client_kill (c, reason);
|
|
return;
|
|
}
|
|
if (!soft_assert (!c->closing_link))
|
|
return;
|
|
|
|
// We push an `ERROR' message to the write buffer and let the poller send
|
|
// it, with some arbitrary timeout. The `closing_link' state makes sure
|
|
// that a/ we ignore any successive messages, and b/ that the connection
|
|
// is killed after the write buffer is transferred and emptied.
|
|
client_send (c, "ERROR :Closing Link: %s[%s] (%s)",
|
|
c->nickname ? c->nickname : "*",
|
|
c->hostname /* TODO host IP? */, reason);
|
|
c->closing_link = true;
|
|
|
|
client_unregister (c, reason);
|
|
client_set_kill_timer (c);
|
|
}
|
|
|
|
static bool
|
|
client_in_mask_list (const struct client *c, const struct strv *mask)
|
|
{
|
|
char *client = xstrdup_printf ("%s!%s@%s",
|
|
c->nickname, c->username, c->hostname);
|
|
bool result = false;
|
|
for (size_t i = 0; i < mask->len; i++)
|
|
if (!irc_fnmatch (mask->vector[i], client))
|
|
{
|
|
result = true;
|
|
break;
|
|
}
|
|
free (client);
|
|
return result;
|
|
}
|
|
|
|
static char *
|
|
client_get_ssl_cert_fingerprint (struct client *c)
|
|
{
|
|
if (!c->ssl)
|
|
return NULL;
|
|
|
|
X509 *peer_cert = SSL_get_peer_certificate (c->ssl);
|
|
if (!peer_cert)
|
|
return NULL;
|
|
|
|
int cert_len = i2d_X509 (peer_cert, NULL);
|
|
if (cert_len < 0)
|
|
return NULL;
|
|
|
|
unsigned char cert[cert_len], *p = cert;
|
|
if (i2d_X509 (peer_cert, &p) < 0)
|
|
return NULL;
|
|
|
|
unsigned char hash[SHA_DIGEST_LENGTH];
|
|
SHA1 (cert, cert_len, hash);
|
|
|
|
struct str fingerprint = str_make ();
|
|
for (size_t i = 0; i < sizeof hash; i++)
|
|
str_append_printf (&fingerprint, "%02x", hash[i]);
|
|
return str_steal (&fingerprint);
|
|
}
|
|
|
|
// --- Timers ------------------------------------------------------------------
|
|
|
|
static void
|
|
client_cancel_timers (struct client *c)
|
|
{
|
|
poller_timer_reset (&c->kill_timer);
|
|
poller_timer_reset (&c->timeout_timer);
|
|
poller_timer_reset (&c->ping_timer);
|
|
poller_timer_reset (&c->gni_timer);
|
|
}
|
|
|
|
static void
|
|
client_set_timer (struct client *c,
|
|
struct poller_timer *timer, unsigned interval)
|
|
{
|
|
client_cancel_timers (c);
|
|
poller_timer_set (timer, interval * 1000);
|
|
}
|
|
|
|
static void
|
|
on_client_kill_timer (struct client *c)
|
|
{
|
|
hard_assert (!c->initialized || c->closing_link);
|
|
client_kill (c, NULL);
|
|
}
|
|
|
|
static void
|
|
client_set_kill_timer (struct client *c)
|
|
{
|
|
client_set_timer (c, &c->kill_timer, c->ctx->ping_interval);
|
|
}
|
|
|
|
static void
|
|
on_client_timeout_timer (struct client *c)
|
|
{
|
|
char *reason = xstrdup_printf
|
|
("Ping timeout: >%u seconds", c->ctx->ping_interval);
|
|
client_close_link (c, reason);
|
|
free (reason);
|
|
}
|
|
|
|
static void
|
|
on_client_ping_timer (struct client *c)
|
|
{
|
|
hard_assert (!c->closing_link);
|
|
client_send (c, "PING :%s", c->ctx->server_name);
|
|
client_set_timer (c, &c->timeout_timer, c->ctx->ping_interval);
|
|
}
|
|
|
|
static void
|
|
client_set_ping_timer (struct client *c)
|
|
{
|
|
client_set_timer (c, &c->ping_timer, c->ctx->ping_interval);
|
|
}
|
|
|
|
// --- IRC command handling ----------------------------------------------------
|
|
|
|
static void
|
|
irc_make_reply (struct client *c, int id, va_list ap, struct str *output)
|
|
{
|
|
str_append_printf (output, ":%s %03d %s ",
|
|
c->ctx->server_name, id, c->nickname ? c->nickname : "*");
|
|
str_append_vprintf (output,
|
|
irc_get_text (c->ctx, id, g_default_replies[id]), ap);
|
|
}
|
|
|
|
// XXX: this way we cannot typecheck the arguments, so we must be careful
|
|
static void
|
|
irc_send_reply (struct client *c, int id, ...)
|
|
{
|
|
struct str reply = str_make ();
|
|
|
|
va_list ap;
|
|
va_start (ap, id);
|
|
irc_make_reply (c, id, ap, &reply);
|
|
va_end (ap);
|
|
|
|
client_send_str (c, &reply);
|
|
str_free (&reply);
|
|
}
|
|
|
|
/// Send a space-separated list of words across as many replies as needed
|
|
static void
|
|
irc_send_reply_vector (struct client *c, int id, char **items, ...)
|
|
{
|
|
struct str common = str_make ();
|
|
|
|
va_list ap;
|
|
va_start (ap, items);
|
|
irc_make_reply (c, id, ap, &common);
|
|
va_end (ap);
|
|
|
|
// We always send at least one message (there might be a client that
|
|
// expects us to send this message at least once)
|
|
do
|
|
{
|
|
struct str reply = str_make ();
|
|
str_append_str (&reply, &common);
|
|
|
|
// If not even a single item fits in the limit (which may happen,
|
|
// in theory) it just gets cropped. We could also skip it.
|
|
if (*items)
|
|
str_append (&reply, *items++);
|
|
|
|
// Append as many items as fits in a single message
|
|
while (*items
|
|
&& reply.len + 1 + strlen (*items) <= IRC_MAX_MESSAGE_LENGTH)
|
|
str_append_printf (&reply, " %s", *items++);
|
|
|
|
client_send_str (c, &reply);
|
|
str_free (&reply);
|
|
}
|
|
while (*items);
|
|
str_free (&common);
|
|
}
|
|
|
|
#define RETURN_WITH_REPLY(c, ...) \
|
|
BLOCK_START \
|
|
irc_send_reply ((c), __VA_ARGS__); \
|
|
return; \
|
|
BLOCK_END
|
|
|
|
static void
|
|
irc_send_motd (struct client *c)
|
|
{
|
|
struct server_context *ctx = c->ctx;
|
|
if (!ctx->motd.len)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOMOTD);
|
|
|
|
irc_send_reply (c, IRC_RPL_MOTDSTART, ctx->server_name);
|
|
for (size_t i = 0; i < ctx->motd.len; i++)
|
|
irc_send_reply (c, IRC_RPL_MOTD, ctx->motd.vector[i]);
|
|
irc_send_reply (c, IRC_RPL_ENDOFMOTD);
|
|
}
|
|
|
|
static void
|
|
irc_send_lusers (struct client *c)
|
|
{
|
|
int n_users = 0, n_services = 0, n_opers = 0, n_unknown = 0;
|
|
for (struct client *link = c->ctx->clients; link; link = link->next)
|
|
{
|
|
if (link->registered)
|
|
n_users++;
|
|
else
|
|
n_unknown++;
|
|
if (link->mode & IRC_USER_MODE_OPERATOR)
|
|
n_opers++;
|
|
}
|
|
|
|
int n_channels = 0;
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
|
|
struct channel *chan;
|
|
while ((chan = str_map_iter_next (&iter)))
|
|
if (!(chan->modes & IRC_CHAN_MODE_SECRET)
|
|
|| channel_get_user (chan, c))
|
|
n_channels++;
|
|
|
|
irc_send_reply (c, IRC_RPL_LUSERCLIENT,
|
|
n_users, n_services, 1 /* servers total */);
|
|
if (n_opers)
|
|
irc_send_reply (c, IRC_RPL_LUSEROP, n_opers);
|
|
if (n_unknown)
|
|
irc_send_reply (c, IRC_RPL_LUSERUNKNOWN, n_unknown);
|
|
if (n_channels)
|
|
irc_send_reply (c, IRC_RPL_LUSERCHANNELS, n_channels);
|
|
irc_send_reply (c, IRC_RPL_LUSERME,
|
|
n_users + n_services + n_unknown, 0 /* peer servers */);
|
|
}
|
|
|
|
static bool
|
|
irc_is_this_me (struct server_context *ctx, const char *target)
|
|
{
|
|
// Target servers can also be matched by their users
|
|
return !irc_fnmatch (target, ctx->server_name)
|
|
|| str_map_find (&ctx->users, target);
|
|
}
|
|
|
|
static void
|
|
irc_send_isupport (struct client *c)
|
|
{
|
|
// Only # channels, +e supported, +I supported, unlimited arguments to MODE
|
|
irc_send_reply (c, IRC_RPL_ISUPPORT, "CHANTYPES=# EXCEPTS INVEX MODES"
|
|
" TARGMAX=WHOIS:,LIST:,NAMES:,PRIVMSG:1,NOTICE:1,KICK:"
|
|
" NICKLEN=" XSTRINGIFY (IRC_MAX_NICKNAME)
|
|
" CHANNELLEN=" XSTRINGIFY (IRC_MAX_CHANNEL_NAME));
|
|
}
|
|
|
|
static void
|
|
irc_try_finish_registration (struct client *c)
|
|
{
|
|
struct server_context *ctx = c->ctx;
|
|
if (!c->nickname || !c->username || !c->realname)
|
|
return;
|
|
if (c->registered || c->cap_negotiating)
|
|
return;
|
|
|
|
c->registered = true;
|
|
irc_send_reply (c, IRC_RPL_WELCOME, c->nickname, c->username, c->hostname);
|
|
|
|
irc_send_reply (c, IRC_RPL_YOURHOST, ctx->server_name, PROGRAM_VERSION);
|
|
// The purpose of this message eludes me
|
|
irc_send_reply (c, IRC_RPL_CREATED, __DATE__);
|
|
irc_send_reply (c, IRC_RPL_MYINFO, ctx->server_name, PROGRAM_VERSION,
|
|
IRC_SUPPORTED_USER_MODES, IRC_SUPPORTED_CHAN_MODES);
|
|
|
|
irc_send_isupport (c);
|
|
irc_send_lusers (c);
|
|
irc_send_motd (c);
|
|
|
|
char *mode = client_get_mode (c);
|
|
if (*mode)
|
|
client_send (c, ":%s MODE %s :+%s", c->nickname, c->nickname, mode);
|
|
free (mode);
|
|
|
|
hard_assert (c->ssl_cert_fingerprint == NULL);
|
|
if ((c->ssl_cert_fingerprint = client_get_ssl_cert_fingerprint (c)))
|
|
client_send (c, ":%s NOTICE %s :"
|
|
"Your TLS client certificate fingerprint is %s",
|
|
ctx->server_name, c->nickname, c->ssl_cert_fingerprint);
|
|
|
|
str_map_set (&ctx->whowas, c->nickname, NULL);
|
|
}
|
|
|
|
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
|
|
// IRCv3 capability negotiation. See http://ircv3.org for details.
|
|
|
|
struct irc_cap_args
|
|
{
|
|
const char *subcommand; ///< The subcommand being processed
|
|
const char *full_params; ///< Whole parameter string
|
|
struct strv params; ///< Split parameters
|
|
const char *target; ///< Target parameter for replies
|
|
};
|
|
|
|
static struct
|
|
{
|
|
unsigned flag; ///< Flag
|
|
const char *name; ///< Name of the capability
|
|
}
|
|
irc_cap_table[] =
|
|
{
|
|
{ IRC_CAP_MULTI_PREFIX, "multi-prefix" },
|
|
{ IRC_CAP_INVITE_NOTIFY, "invite-notify" },
|
|
{ IRC_CAP_ECHO_MESSAGE, "echo-message" },
|
|
{ IRC_CAP_USERHOST_IN_NAMES, "userhost-in-names" },
|
|
{ IRC_CAP_SERVER_TIME, "server-time" },
|
|
};
|
|
|
|
static void
|
|
irc_handle_cap_ls (struct client *c, struct irc_cap_args *a)
|
|
{
|
|
if (a->params.len == 1
|
|
&& !xstrtoul (&c->cap_version, a->params.vector[0], 10))
|
|
irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
|
|
a->subcommand, "Ignoring invalid protocol version number");
|
|
|
|
c->cap_negotiating = true;
|
|
client_send (c, ":%s CAP %s LS :multi-prefix invite-notify echo-message"
|
|
" userhost-in-names server-time", c->ctx->server_name, a->target);
|
|
}
|
|
|
|
static void
|
|
irc_handle_cap_list (struct client *c, struct irc_cap_args *a)
|
|
{
|
|
struct strv caps = strv_make ();
|
|
for (size_t i = 0; i < N_ELEMENTS (irc_cap_table); i++)
|
|
if (c->caps_enabled & irc_cap_table[i].flag)
|
|
strv_append (&caps, irc_cap_table[i].name);
|
|
|
|
char *caps_str = strv_join (&caps, " ");
|
|
strv_free (&caps);
|
|
client_send (c, ":%s CAP %s LIST :%s",
|
|
c->ctx->server_name, a->target, caps_str);
|
|
free (caps_str);
|
|
}
|
|
|
|
static unsigned
|
|
irc_decode_capability (const char *name)
|
|
{
|
|
for (size_t i = 0; i < N_ELEMENTS (irc_cap_table); i++)
|
|
if (!strcmp (irc_cap_table[i].name, name))
|
|
return irc_cap_table[i].flag;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
irc_handle_cap_req (struct client *c, struct irc_cap_args *a)
|
|
{
|
|
c->cap_negotiating = true;
|
|
|
|
unsigned new_caps = c->caps_enabled;
|
|
bool success = true;
|
|
for (size_t i = 0; i < a->params.len; i++)
|
|
{
|
|
bool removing = false;
|
|
const char *name = a->params.vector[i];
|
|
if (*name == '-')
|
|
{
|
|
removing = true;
|
|
name++;
|
|
}
|
|
|
|
unsigned cap;
|
|
if (!(cap = irc_decode_capability (name)))
|
|
success = false;
|
|
else if (removing)
|
|
new_caps &= ~cap;
|
|
else
|
|
new_caps |= cap;
|
|
}
|
|
|
|
if (success)
|
|
{
|
|
c->caps_enabled = new_caps;
|
|
client_send (c, ":%s CAP %s ACK :%s",
|
|
c->ctx->server_name, a->target, a->full_params);
|
|
}
|
|
else
|
|
client_send (c, ":%s CAP %s NAK :%s",
|
|
c->ctx->server_name, a->target, a->full_params);
|
|
}
|
|
|
|
static void
|
|
irc_handle_cap_ack (struct client *c, struct irc_cap_args *a)
|
|
{
|
|
if (a->params.len)
|
|
irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
|
|
a->subcommand, "No acknowledgable capabilities supported");
|
|
}
|
|
|
|
static void
|
|
irc_handle_cap_end (struct client *c, struct irc_cap_args *a)
|
|
{
|
|
(void) a;
|
|
|
|
c->cap_negotiating = false;
|
|
irc_try_finish_registration (c);
|
|
}
|
|
|
|
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
|
|
struct irc_cap_command
|
|
{
|
|
const char *name;
|
|
void (*handler) (struct client *, struct irc_cap_args *);
|
|
};
|
|
|
|
static void
|
|
irc_register_cap_handlers (struct server_context *ctx)
|
|
{
|
|
static const struct irc_cap_command cap_handlers[] =
|
|
{
|
|
{ "LS", irc_handle_cap_ls },
|
|
{ "LIST", irc_handle_cap_list },
|
|
{ "REQ", irc_handle_cap_req },
|
|
{ "ACK", irc_handle_cap_ack },
|
|
{ "END", irc_handle_cap_end },
|
|
};
|
|
|
|
for (size_t i = 0; i < N_ELEMENTS (cap_handlers); i++)
|
|
{
|
|
const struct irc_cap_command *cmd = &cap_handlers[i];
|
|
str_map_set (&ctx->cap_handlers, cmd->name, (void *) cmd);
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_handle_cap (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
struct irc_cap_args args;
|
|
args.target = c->nickname ? c->nickname : "*";
|
|
args.subcommand = msg->params.vector[0];
|
|
args.full_params = "";
|
|
args.params = strv_make ();
|
|
|
|
if (msg->params.len > 1)
|
|
{
|
|
args.full_params = msg->params.vector[1];
|
|
cstr_split (args.full_params, " ", true, &args.params);
|
|
}
|
|
|
|
struct irc_cap_command *cmd =
|
|
str_map_find (&c->ctx->cap_handlers, args.subcommand);
|
|
if (!cmd)
|
|
irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
|
|
args.subcommand, "Invalid CAP subcommand");
|
|
else
|
|
cmd->handler (c, &args);
|
|
|
|
strv_free (&args.params);
|
|
}
|
|
|
|
static void
|
|
irc_handle_pass (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (c->registered)
|
|
irc_send_reply (c, IRC_ERR_ALREADYREGISTERED);
|
|
else if (msg->params.len < 1)
|
|
irc_send_reply (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
// We have TLS client certificates for this purpose; ignoring
|
|
}
|
|
|
|
static void
|
|
irc_handle_nick (const struct irc_message *msg, struct client *c)
|
|
{
|
|
struct server_context *ctx = c->ctx;
|
|
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NONICKNAMEGIVEN);
|
|
|
|
const char *nickname = msg->params.vector[0];
|
|
if (irc_validate_nickname (nickname) != VALIDATION_OK)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_ERRONEOUSNICKNAME, nickname);
|
|
|
|
struct client *client = str_map_find (&ctx->users, nickname);
|
|
if (client && client != c)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NICKNAMEINUSE, nickname);
|
|
|
|
// Nothing to do here, let's not annoy roommates
|
|
if (c->nickname && !strcmp (c->nickname, nickname))
|
|
return;
|
|
|
|
if (c->registered)
|
|
{
|
|
client_add_to_whowas (c);
|
|
|
|
char *message = xstrdup_printf (":%s!%s@%s NICK :%s",
|
|
c->nickname, c->username, c->hostname, nickname);
|
|
irc_send_to_roommates (c, message);
|
|
client_send (c, "%s", message);
|
|
free (message);
|
|
}
|
|
|
|
// Release the old nickname and allocate a new one
|
|
if (c->nickname)
|
|
str_map_set (&ctx->users, c->nickname, NULL);
|
|
|
|
cstr_set (&c->nickname, xstrdup (nickname));
|
|
str_map_set (&ctx->users, nickname, c);
|
|
|
|
irc_try_finish_registration (c);
|
|
}
|
|
|
|
static void
|
|
irc_handle_user (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (c->registered)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_ALREADYREGISTERED);
|
|
if (msg->params.len < 4)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
const char *username = msg->params.vector[0];
|
|
const char *mode = msg->params.vector[1];
|
|
const char *realname = msg->params.vector[3];
|
|
|
|
// Unfortunately the protocol doesn't give us any means of rejecting it
|
|
if (!irc_is_valid_user (username))
|
|
username = "xxx";
|
|
|
|
cstr_set (&c->username, xstrdup (username));
|
|
cstr_set (&c->realname, xstrdup (realname));
|
|
c->mode = 0;
|
|
|
|
unsigned long m;
|
|
if (xstrtoul (&m, mode, 10))
|
|
{
|
|
if (m & 4) c->mode |= IRC_USER_MODE_RX_WALLOPS;
|
|
if (m & 8) c->mode |= IRC_USER_MODE_INVISIBLE;
|
|
}
|
|
|
|
irc_try_finish_registration (c);
|
|
}
|
|
|
|
static void
|
|
irc_handle_userhost (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
struct str reply = str_make ();
|
|
for (size_t i = 0; i < 5 && i < msg->params.len; i++)
|
|
{
|
|
const char *nick = msg->params.vector[i];
|
|
struct client *target = str_map_find (&c->ctx->users, nick);
|
|
if (!target)
|
|
continue;
|
|
|
|
if (i)
|
|
str_append_c (&reply, ' ');
|
|
str_append (&reply, nick);
|
|
if (target->mode & IRC_USER_MODE_OPERATOR)
|
|
str_append_c (&reply, '*');
|
|
str_append_printf (&reply, "=%c%s@%s",
|
|
target->away_message ? '-' : '+',
|
|
target->username, target->hostname);
|
|
}
|
|
irc_send_reply (c, IRC_RPL_USERHOST, reply.str);
|
|
str_free (&reply);
|
|
}
|
|
|
|
static void
|
|
irc_handle_lusers (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
|
|
irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
|
|
else
|
|
irc_send_lusers (c);
|
|
}
|
|
|
|
static void
|
|
irc_handle_motd (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
|
|
irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
|
|
else
|
|
irc_send_motd (c);
|
|
}
|
|
|
|
static void
|
|
irc_handle_ping (const struct irc_message *msg, struct client *c)
|
|
{
|
|
// XXX: the RFC is pretty incomprehensible about the exact usage
|
|
if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
|
|
irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
|
|
else if (msg->params.len < 1)
|
|
irc_send_reply (c, IRC_ERR_NOORIGIN);
|
|
else
|
|
client_send (c, ":%s PONG :%s",
|
|
c->ctx->server_name, msg->params.vector[0]);
|
|
}
|
|
|
|
static void
|
|
irc_handle_pong (const struct irc_message *msg, struct client *c)
|
|
{
|
|
// We are the only server, so we don't have to care too much
|
|
if (msg->params.len < 1)
|
|
irc_send_reply (c, IRC_ERR_NOORIGIN);
|
|
else
|
|
// Set a new timer to send another PING
|
|
client_set_ping_timer (c);
|
|
}
|
|
|
|
static void
|
|
irc_handle_quit (const struct irc_message *msg, struct client *c)
|
|
{
|
|
char *reason = xstrdup_printf ("Quit: %s",
|
|
msg->params.len > 0 ? msg->params.vector[0] : c->nickname);
|
|
client_close_link (c, reason);
|
|
free (reason);
|
|
}
|
|
|
|
static void
|
|
irc_handle_time (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
|
|
|
|
char buf[32] = "";
|
|
time_t now = time (NULL);
|
|
struct tm tm;
|
|
strftime (buf, sizeof buf, "%a %b %d %Y %T", localtime_r (&now, &tm));
|
|
irc_send_reply (c, IRC_RPL_TIME, c->ctx->server_name, buf);
|
|
}
|
|
|
|
static void
|
|
irc_handle_version (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
|
|
|
|
irc_send_reply (c, IRC_RPL_VERSION, PROGRAM_VERSION, g_debug_mode,
|
|
c->ctx->server_name, PROGRAM_NAME " " PROGRAM_VERSION);
|
|
irc_send_isupport (c);
|
|
}
|
|
|
|
static void
|
|
irc_channel_multicast (struct channel *chan, const char *message,
|
|
struct client *except)
|
|
{
|
|
for (struct channel_user *iter = chan->users; iter; iter = iter->next)
|
|
if (iter->c != except)
|
|
client_send (iter->c, "%s", message);
|
|
}
|
|
|
|
static bool
|
|
irc_modify_mode (unsigned *mask, unsigned mode, bool add)
|
|
{
|
|
unsigned orig = *mask;
|
|
if (add)
|
|
*mask |= mode;
|
|
else
|
|
*mask &= ~mode;
|
|
return *mask != orig;
|
|
}
|
|
|
|
static void
|
|
irc_update_user_mode (struct client *c, unsigned new_mode)
|
|
{
|
|
unsigned old_mode = c->mode;
|
|
c->mode = new_mode;
|
|
|
|
unsigned added = new_mode & ~old_mode;
|
|
unsigned removed = old_mode & ~new_mode;
|
|
|
|
struct str diff = str_make ();
|
|
if (added)
|
|
{
|
|
str_append_c (&diff, '+');
|
|
client_mode_to_str (added, &diff);
|
|
}
|
|
if (removed)
|
|
{
|
|
str_append_c (&diff, '-');
|
|
client_mode_to_str (removed, &diff);
|
|
}
|
|
|
|
if (diff.len)
|
|
client_send (c, ":%s MODE %s :%s",
|
|
c->nickname, c->nickname, diff.str);
|
|
str_free (&diff);
|
|
}
|
|
|
|
static void
|
|
irc_handle_user_mode_change (struct client *c, const char *mode_string)
|
|
{
|
|
unsigned new_mode = c->mode;
|
|
bool adding = true;
|
|
|
|
while (*mode_string)
|
|
switch (*mode_string++)
|
|
{
|
|
case '+': adding = true; break;
|
|
case '-': adding = false; break;
|
|
|
|
case 'a':
|
|
// Ignore, the client should use AWAY
|
|
break;
|
|
case 'i':
|
|
irc_modify_mode (&new_mode, IRC_USER_MODE_INVISIBLE, adding);
|
|
break;
|
|
case 'w':
|
|
irc_modify_mode (&new_mode, IRC_USER_MODE_RX_WALLOPS, adding);
|
|
break;
|
|
case 'r':
|
|
// It's not possible to un-restrict yourself
|
|
if (adding)
|
|
new_mode |= IRC_USER_MODE_RESTRICTED;
|
|
break;
|
|
case 'o':
|
|
if (!adding)
|
|
new_mode &= ~IRC_USER_MODE_OPERATOR;
|
|
else if (c->ssl_cert_fingerprint
|
|
&& str_map_find (&c->ctx->operators, c->ssl_cert_fingerprint))
|
|
new_mode |= IRC_USER_MODE_OPERATOR;
|
|
else
|
|
client_send (c, ":%s NOTICE %s :Either you're not using an TLS"
|
|
" client certificate, or the fingerprint doesn't match",
|
|
c->ctx->server_name, c->nickname);
|
|
break;
|
|
case 's':
|
|
irc_modify_mode (&new_mode, IRC_USER_MODE_RX_SERVER_NOTICES, adding);
|
|
break;
|
|
default:
|
|
RETURN_WITH_REPLY (c, IRC_ERR_UMODEUNKNOWNFLAG);
|
|
}
|
|
irc_update_user_mode (c, new_mode);
|
|
}
|
|
|
|
static void
|
|
irc_send_channel_list (struct client *c, const char *channel_name,
|
|
const struct strv *list, int reply, int end_reply)
|
|
{
|
|
for (size_t i = 0; i < list->len; i++)
|
|
irc_send_reply (c, reply, channel_name, list->vector[i]);
|
|
irc_send_reply (c, end_reply, channel_name);
|
|
}
|
|
|
|
static char *
|
|
irc_check_expand_user_mask (const char *mask)
|
|
{
|
|
struct str result = str_make ();
|
|
str_append (&result, mask);
|
|
|
|
// Make sure it is a complete mask
|
|
if (!strchr (result.str, '!'))
|
|
str_append (&result, "!*");
|
|
if (!strchr (result.str, '@'))
|
|
str_append (&result, "@*");
|
|
|
|
// And validate whatever the result is
|
|
if (!irc_is_valid_user_mask (result.str))
|
|
{
|
|
str_free (&result);
|
|
return NULL;
|
|
}
|
|
return str_steal (&result);
|
|
}
|
|
|
|
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
|
|
// Channel MODE command handling. This is by far the worst command to implement
|
|
// from the whole RFC; don't blame me if it doesn't work exactly as expected.
|
|
|
|
struct mode_processor
|
|
{
|
|
// Inputs to set after initialization:
|
|
|
|
char **params; ///< Mode string parameters
|
|
|
|
struct client *c; ///< Who does the changes
|
|
struct channel *channel; ///< The channel we're modifying
|
|
struct channel_user *user; ///< Presence of the client in the chan
|
|
|
|
// Internals:
|
|
|
|
bool adding; ///< Currently adding modes
|
|
char mode_char; ///< Currently processed mode char
|
|
|
|
struct str added; ///< Added modes
|
|
struct str removed; ///< Removed modes
|
|
|
|
struct strv added_params; ///< Params for added modes
|
|
struct strv removed_params; ///< Params for removed modes
|
|
|
|
struct str *output; ///< "added" or "removed"
|
|
struct strv *output_params; ///< Similarly for "*_params"
|
|
};
|
|
|
|
static struct mode_processor
|
|
mode_processor_make (void)
|
|
{
|
|
return (struct mode_processor)
|
|
{
|
|
.added = str_make (), .added_params = strv_make (),
|
|
.removed = str_make (), .removed_params = strv_make (),
|
|
};
|
|
}
|
|
|
|
static void
|
|
mode_processor_free (struct mode_processor *self)
|
|
{
|
|
str_free (&self->added);
|
|
str_free (&self->removed);
|
|
|
|
strv_free (&self->added_params);
|
|
strv_free (&self->removed_params);
|
|
}
|
|
|
|
static const char *
|
|
mode_processor_next_param (struct mode_processor *self)
|
|
{
|
|
if (!*self->params)
|
|
return NULL;
|
|
return *self->params++;
|
|
}
|
|
|
|
static bool
|
|
mode_processor_check_operator (struct mode_processor *self)
|
|
{
|
|
if ((self->user && (self->user->modes & IRC_CHAN_MODE_OPERATOR))
|
|
|| (self->c->mode & IRC_USER_MODE_OPERATOR))
|
|
return true;
|
|
|
|
irc_send_reply (self->c, IRC_ERR_CHANOPRIVSNEEDED, self->channel->name);
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
mode_processor_do_user (struct mode_processor *self, int mode)
|
|
{
|
|
const char *target = mode_processor_next_param (self);
|
|
if (!mode_processor_check_operator (self) || !target)
|
|
return;
|
|
|
|
struct client *client;
|
|
struct channel_user *target_user;
|
|
if (!(client = str_map_find (&self->c->ctx->users, target)))
|
|
irc_send_reply (self->c, IRC_ERR_NOSUCHNICK, target);
|
|
else if (!(target_user = channel_get_user (self->channel, client)))
|
|
irc_send_reply (self->c, IRC_ERR_USERNOTINCHANNEL,
|
|
target, self->channel->name);
|
|
else if (irc_modify_mode (&target_user->modes, mode, self->adding))
|
|
{
|
|
str_append_c (self->output, self->mode_char);
|
|
strv_append (self->output_params, client->nickname);
|
|
}
|
|
}
|
|
|
|
static bool
|
|
mode_processor_do_chan (struct mode_processor *self, int mode)
|
|
{
|
|
if (!mode_processor_check_operator (self)
|
|
|| !irc_modify_mode (&self->channel->modes, mode, self->adding))
|
|
return false;
|
|
|
|
str_append_c (self->output, self->mode_char);
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
mode_processor_do_chan_remove
|
|
(struct mode_processor *self, char mode_char, int mode)
|
|
{
|
|
if (self->adding
|
|
&& irc_modify_mode (&self->channel->modes, mode, false))
|
|
str_append_c (&self->removed, mode_char);
|
|
}
|
|
|
|
static void
|
|
mode_processor_do_list (struct mode_processor *self,
|
|
struct strv *list, int list_msg, int end_msg)
|
|
{
|
|
const char *target = mode_processor_next_param (self);
|
|
if (!target)
|
|
{
|
|
if (self->adding)
|
|
irc_send_channel_list (self->c, self->channel->name,
|
|
list, list_msg, end_msg);
|
|
return;
|
|
}
|
|
|
|
if (!mode_processor_check_operator (self))
|
|
return;
|
|
|
|
char *mask = irc_check_expand_user_mask (target);
|
|
if (!mask)
|
|
return;
|
|
|
|
size_t i;
|
|
for (i = 0; i < list->len; i++)
|
|
if (!irc_strcmp (list->vector[i], mask))
|
|
break;
|
|
|
|
bool found = i != list->len;
|
|
if (found != self->adding)
|
|
{
|
|
if (self->adding)
|
|
strv_append (list, mask);
|
|
else
|
|
strv_remove (list, i);
|
|
|
|
str_append_c (self->output, self->mode_char);
|
|
strv_append (self->output_params, mask);
|
|
}
|
|
free (mask);
|
|
}
|
|
|
|
static void
|
|
mode_processor_do_key (struct mode_processor *self)
|
|
{
|
|
const char *target = mode_processor_next_param (self);
|
|
if (!mode_processor_check_operator (self) || !target)
|
|
return;
|
|
|
|
if (!self->adding)
|
|
{
|
|
if (!self->channel->key || irc_strcmp (target, self->channel->key))
|
|
return;
|
|
|
|
str_append_c (&self->removed, self->mode_char);
|
|
strv_append (&self->removed_params, self->channel->key);
|
|
cstr_set (&self->channel->key, NULL);
|
|
}
|
|
else if (!irc_is_valid_key (target))
|
|
// TODO: we should notify the user somehow
|
|
return;
|
|
else if (self->channel->key)
|
|
irc_send_reply (self->c, IRC_ERR_KEYSET, self->channel->name);
|
|
else
|
|
{
|
|
self->channel->key = xstrdup (target);
|
|
str_append_c (&self->added, self->mode_char);
|
|
strv_append (&self->added_params, self->channel->key);
|
|
}
|
|
}
|
|
|
|
static void
|
|
mode_processor_do_limit (struct mode_processor *self)
|
|
{
|
|
if (!mode_processor_check_operator (self))
|
|
return;
|
|
|
|
const char *target;
|
|
if (!self->adding)
|
|
{
|
|
if (self->channel->user_limit == -1)
|
|
return;
|
|
|
|
self->channel->user_limit = -1;
|
|
str_append_c (&self->removed, self->mode_char);
|
|
}
|
|
else if ((target = mode_processor_next_param (self)))
|
|
{
|
|
unsigned long x;
|
|
if (xstrtoul (&x, target, 10) && x > 0 && x <= LONG_MAX)
|
|
{
|
|
self->channel->user_limit = x;
|
|
str_append_c (&self->added, self->mode_char);
|
|
strv_append (&self->added_params, target);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool
|
|
mode_processor_step (struct mode_processor *self, char mode_char)
|
|
{
|
|
switch ((self->mode_char = mode_char))
|
|
{
|
|
case '+':
|
|
self->adding = true;
|
|
self->output = &self->added;
|
|
self->output_params = &self->added_params;
|
|
break;
|
|
case '-':
|
|
self->adding = false;
|
|
self->output = &self->removed;
|
|
self->output_params = &self->removed_params;
|
|
break;
|
|
|
|
#define USER(mode) mode_processor_do_user (self, (mode))
|
|
#define CHAN(mode) mode_processor_do_chan (self, (mode))
|
|
|
|
case 'o': USER (IRC_CHAN_MODE_OPERATOR); break;
|
|
case 'v': USER (IRC_CHAN_MODE_VOICE); break;
|
|
|
|
case 'i': CHAN (IRC_CHAN_MODE_INVITE_ONLY); break;
|
|
case 'm': CHAN (IRC_CHAN_MODE_MODERATED); break;
|
|
case 'n': CHAN (IRC_CHAN_MODE_NO_OUTSIDE_MSGS); break;
|
|
case 'q': CHAN (IRC_CHAN_MODE_QUIET); break;
|
|
case 't': CHAN (IRC_CHAN_MODE_PROTECTED_TOPIC); break;
|
|
|
|
case 'p':
|
|
if (CHAN (IRC_CHAN_MODE_PRIVATE))
|
|
mode_processor_do_chan_remove (self, 's', IRC_CHAN_MODE_SECRET);
|
|
break;
|
|
case 's':
|
|
if (CHAN (IRC_CHAN_MODE_SECRET))
|
|
mode_processor_do_chan_remove (self, 'p', IRC_CHAN_MODE_PRIVATE);
|
|
break;
|
|
|
|
#undef USER
|
|
#undef CHAN
|
|
|
|
case 'b':
|
|
mode_processor_do_list (self, &self->channel->ban_list,
|
|
IRC_RPL_BANLIST, IRC_RPL_ENDOFBANLIST);
|
|
break;
|
|
case 'e':
|
|
mode_processor_do_list (self, &self->channel->exception_list,
|
|
IRC_RPL_EXCEPTLIST, IRC_RPL_ENDOFEXCEPTLIST);
|
|
break;
|
|
case 'I':
|
|
mode_processor_do_list (self, &self->channel->invite_list,
|
|
IRC_RPL_INVITELIST, IRC_RPL_ENDOFINVITELIST);
|
|
break;
|
|
|
|
case 'k':
|
|
mode_processor_do_key (self);
|
|
break;
|
|
case 'l':
|
|
mode_processor_do_limit (self);
|
|
break;
|
|
|
|
default:
|
|
// It's not safe to continue, results could be undesired
|
|
irc_send_reply (self->c, IRC_ERR_UNKNOWNMODE,
|
|
mode_char, self->channel->name);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
irc_handle_chan_mode_change
|
|
(struct client *c, struct channel *chan, char *params[])
|
|
{
|
|
struct mode_processor p = mode_processor_make ();
|
|
p.params = params;
|
|
p.channel = chan;
|
|
p.c = c;
|
|
p.user = channel_get_user (chan, c);
|
|
|
|
const char *mode_string;
|
|
while ((mode_string = mode_processor_next_param (&p)))
|
|
{
|
|
mode_processor_step (&p, '+');
|
|
while (*mode_string)
|
|
if (!mode_processor_step (&p, *mode_string++))
|
|
goto done_processing;
|
|
}
|
|
|
|
// TODO: limit to three changes with parameter per command
|
|
done_processing:
|
|
if (p.added.len || p.removed.len)
|
|
{
|
|
struct str message = str_make ();
|
|
str_append_printf (&message, ":%s!%s@%s MODE %s ",
|
|
p.c->nickname, p.c->username, p.c->hostname,
|
|
p.channel->name);
|
|
if (p.added.len)
|
|
str_append_printf (&message, "+%s", p.added.str);
|
|
if (p.removed.len)
|
|
str_append_printf (&message, "-%s", p.removed.str);
|
|
for (size_t i = 0; i < p.added_params.len; i++)
|
|
str_append_printf (&message, " %s", p.added_params.vector[i]);
|
|
for (size_t i = 0; i < p.removed_params.len; i++)
|
|
str_append_printf (&message, " %s", p.removed_params.vector[i]);
|
|
irc_channel_multicast (p.channel, message.str, NULL);
|
|
str_free (&message);
|
|
}
|
|
mode_processor_free (&p);
|
|
}
|
|
|
|
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
|
|
|
static void
|
|
irc_handle_mode (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
const char *target = msg->params.vector[0];
|
|
struct client *client = str_map_find (&c->ctx->users, target);
|
|
struct channel *chan = str_map_find (&c->ctx->channels, target);
|
|
|
|
if (client)
|
|
{
|
|
if (irc_strcmp (target, c->nickname))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_USERSDONTMATCH);
|
|
|
|
if (msg->params.len < 2)
|
|
{
|
|
char *mode = client_get_mode (client);
|
|
irc_send_reply (c, IRC_RPL_UMODEIS, mode);
|
|
free (mode);
|
|
}
|
|
else
|
|
irc_handle_user_mode_change (c, msg->params.vector[1]);
|
|
}
|
|
else if (chan)
|
|
{
|
|
if (msg->params.len < 2)
|
|
{
|
|
char *mode = channel_get_mode (chan, channel_get_user (chan, c));
|
|
irc_send_reply (c, IRC_RPL_CHANNELMODEIS, target, mode);
|
|
irc_send_reply (c, IRC_RPL_CREATIONTIME,
|
|
target, (long long) chan->created);
|
|
free (mode);
|
|
}
|
|
else
|
|
irc_handle_chan_mode_change (c, chan, &msg->params.vector[1]);
|
|
}
|
|
else
|
|
irc_send_reply (c, IRC_ERR_NOSUCHNICK, target);
|
|
}
|
|
|
|
static void
|
|
irc_handle_user_message (const struct irc_message *msg, struct client *c,
|
|
const char *command, bool allow_away_reply)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NORECIPIENT, msg->command);
|
|
if (msg->params.len < 2 || !*msg->params.vector[1])
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOTEXTTOSEND);
|
|
|
|
const char *target = msg->params.vector[0];
|
|
const char *text = msg->params.vector[1];
|
|
struct client *client = str_map_find (&c->ctx->users, target);
|
|
if (client)
|
|
{
|
|
client_send (client, ":%s!%s@%s %s %s :%s",
|
|
c->nickname, c->username, c->hostname, command, target, text);
|
|
if (allow_away_reply && client->away_message)
|
|
irc_send_reply (c, IRC_RPL_AWAY, target, client->away_message);
|
|
|
|
// Acknowledging a message from the client to itself would be silly
|
|
if (client != c && (c->caps_enabled & IRC_CAP_ECHO_MESSAGE))
|
|
client_send (c, ":%s!%s@%s %s %s :%s",
|
|
c->nickname, c->username, c->hostname, command, target, text);
|
|
return;
|
|
}
|
|
|
|
struct channel *chan = str_map_find (&c->ctx->channels, target);
|
|
if (chan)
|
|
{
|
|
struct channel_user *user = channel_get_user (chan, c);
|
|
if ((chan->modes & IRC_CHAN_MODE_NO_OUTSIDE_MSGS) && !user)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
|
|
if ((chan->modes & IRC_CHAN_MODE_MODERATED) && (!user ||
|
|
!(user->modes & (IRC_CHAN_MODE_VOICE | IRC_CHAN_MODE_OPERATOR))))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
|
|
if (client_in_mask_list (c, &chan->ban_list)
|
|
&& !client_in_mask_list (c, &chan->exception_list))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
|
|
|
|
char *message = xstrdup_printf (":%s!%s@%s %s %s :%s",
|
|
c->nickname, c->username, c->hostname, command, target, text);
|
|
irc_channel_multicast (chan, message,
|
|
(c->caps_enabled & IRC_CAP_ECHO_MESSAGE) ? NULL : c);
|
|
free (message);
|
|
return;
|
|
}
|
|
|
|
irc_send_reply (c, IRC_ERR_NOSUCHNICK, target);
|
|
}
|
|
|
|
static void
|
|
irc_handle_privmsg (const struct irc_message *msg, struct client *c)
|
|
{
|
|
irc_handle_user_message (msg, c, "PRIVMSG", true);
|
|
// Let's not care too much about success or failure
|
|
c->last_active = time (NULL);
|
|
}
|
|
|
|
static void
|
|
irc_handle_notice (const struct irc_message *msg, struct client *c)
|
|
{
|
|
irc_handle_user_message (msg, c, "NOTICE", false);
|
|
}
|
|
|
|
static void
|
|
irc_send_rpl_list (struct client *c, const struct channel *chan)
|
|
{
|
|
int visible = 0;
|
|
for (struct channel_user *user = chan->users;
|
|
user; user = user->next)
|
|
// XXX: maybe we should skip IRC_USER_MODE_INVISIBLE
|
|
visible++;
|
|
|
|
irc_send_reply (c, IRC_RPL_LIST, chan->name, visible, chan->topic);
|
|
}
|
|
|
|
static void
|
|
irc_handle_list (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
|
|
|
|
struct channel *chan;
|
|
if (msg->params.len == 0)
|
|
{
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
|
|
while ((chan = str_map_iter_next (&iter)))
|
|
if (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
|
|
|| channel_get_user (chan, c))
|
|
irc_send_rpl_list (c, chan);
|
|
}
|
|
else
|
|
{
|
|
struct strv channels = strv_make ();
|
|
cstr_split (msg->params.vector[0], ",", true, &channels);
|
|
for (size_t i = 0; i < channels.len; i++)
|
|
if ((chan = str_map_find (&c->ctx->channels, channels.vector[i]))
|
|
&& (!(chan->modes & IRC_CHAN_MODE_SECRET)
|
|
|| channel_get_user (chan, c)))
|
|
irc_send_rpl_list (c, chan);
|
|
strv_free (&channels);
|
|
}
|
|
irc_send_reply (c, IRC_RPL_LISTEND);
|
|
}
|
|
|
|
static void
|
|
irc_append_prefixes (struct client *c, struct channel_user *user,
|
|
struct str *output)
|
|
{
|
|
struct str prefixes = str_make ();
|
|
if (user->modes & IRC_CHAN_MODE_OPERATOR) str_append_c (&prefixes, '@');
|
|
if (user->modes & IRC_CHAN_MODE_VOICE) str_append_c (&prefixes, '+');
|
|
|
|
if (prefixes.len)
|
|
{
|
|
if (c->caps_enabled & IRC_CAP_MULTI_PREFIX)
|
|
str_append (output, prefixes.str);
|
|
else
|
|
str_append_c (output, prefixes.str[0]);
|
|
}
|
|
str_free (&prefixes);
|
|
}
|
|
|
|
static char *
|
|
irc_make_rpl_namreply_item
|
|
(struct client *c, struct client *target, struct channel_user *user)
|
|
{
|
|
struct str result = str_make ();
|
|
|
|
if (user)
|
|
irc_append_prefixes (c, user, &result);
|
|
|
|
str_append (&result, target->nickname);
|
|
if (c->caps_enabled & IRC_CAP_USERHOST_IN_NAMES)
|
|
str_append_printf (&result,
|
|
"!%s@%s", target->username, target->hostname);
|
|
return str_steal (&result);
|
|
}
|
|
|
|
static void
|
|
irc_send_rpl_namreply (struct client *c, const struct channel *chan,
|
|
struct str_map *used_nicks)
|
|
{
|
|
char type = '=';
|
|
if (chan->modes & IRC_CHAN_MODE_SECRET)
|
|
type = '@';
|
|
else if (chan->modes & IRC_CHAN_MODE_PRIVATE)
|
|
type = '*';
|
|
|
|
bool on_channel = channel_get_user (chan, c);
|
|
struct strv nicks = strv_make ();
|
|
for (struct channel_user *iter = chan->users; iter; iter = iter->next)
|
|
{
|
|
if (!on_channel && (iter->c->mode & IRC_USER_MODE_INVISIBLE))
|
|
continue;
|
|
if (used_nicks)
|
|
str_map_set (used_nicks, iter->c->nickname, (void *) 1);
|
|
strv_append_owned (&nicks,
|
|
irc_make_rpl_namreply_item (c, iter->c, iter));
|
|
}
|
|
|
|
irc_send_reply_vector (c, IRC_RPL_NAMREPLY,
|
|
nicks.vector, type, chan->name, "");
|
|
strv_free (&nicks);
|
|
}
|
|
|
|
static void
|
|
irc_send_disassociated_names (struct client *c, struct str_map *used)
|
|
{
|
|
struct strv nicks = strv_make ();
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
|
|
struct client *target;
|
|
while ((target = str_map_iter_next (&iter)))
|
|
{
|
|
if ((target->mode & IRC_USER_MODE_INVISIBLE)
|
|
|| str_map_find (used, target->nickname))
|
|
continue;
|
|
strv_append_owned (&nicks,
|
|
irc_make_rpl_namreply_item (c, target, NULL));
|
|
}
|
|
|
|
if (nicks.len)
|
|
irc_send_reply_vector (c, IRC_RPL_NAMREPLY,
|
|
nicks.vector, '*', "*", "");
|
|
strv_free (&nicks);
|
|
}
|
|
|
|
static void
|
|
irc_handle_names (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
|
|
|
|
struct channel *chan;
|
|
if (msg->params.len == 0)
|
|
{
|
|
struct str_map used = str_map_make (NULL);
|
|
used.key_xfrm = irc_strxfrm;
|
|
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
|
|
while ((chan = str_map_iter_next (&iter)))
|
|
if (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
|
|
|| channel_get_user (chan, c))
|
|
irc_send_rpl_namreply (c, chan, &used);
|
|
|
|
// Also send all visible users we haven't listed yet
|
|
irc_send_disassociated_names (c, &used);
|
|
str_map_free (&used);
|
|
|
|
irc_send_reply (c, IRC_RPL_ENDOFNAMES, "*");
|
|
}
|
|
else
|
|
{
|
|
struct strv channels = strv_make ();
|
|
cstr_split (msg->params.vector[0], ",", true, &channels);
|
|
for (size_t i = 0; i < channels.len; i++)
|
|
if ((chan = str_map_find (&c->ctx->channels, channels.vector[i]))
|
|
&& (!(chan->modes & IRC_CHAN_MODE_SECRET)
|
|
|| channel_get_user (chan, c)))
|
|
{
|
|
irc_send_rpl_namreply (c, chan, NULL);
|
|
irc_send_reply (c, IRC_RPL_ENDOFNAMES, channels.vector[i]);
|
|
}
|
|
strv_free (&channels);
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_send_rpl_whoreply (struct client *c, const struct channel *chan,
|
|
const struct client *target)
|
|
{
|
|
struct str chars = str_make ();
|
|
str_append_c (&chars, target->away_message ? 'G' : 'H');
|
|
if (target->mode & IRC_USER_MODE_OPERATOR)
|
|
str_append_c (&chars, '*');
|
|
|
|
struct channel_user *user;
|
|
if (chan && (user = channel_get_user (chan, target)))
|
|
irc_append_prefixes (c, user, &chars);
|
|
|
|
irc_send_reply (c, IRC_RPL_WHOREPLY, chan ? chan->name : "*",
|
|
target->username, target->hostname, target->ctx->server_name,
|
|
target->nickname, chars.str, 0 /* hop count */, target->realname);
|
|
str_free (&chars);
|
|
}
|
|
|
|
static void
|
|
irc_match_send_rpl_whoreply (struct client *c, struct client *target,
|
|
const char *mask)
|
|
{
|
|
bool is_roommate = false;
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
|
|
struct channel *chan;
|
|
while ((chan = str_map_iter_next (&iter)))
|
|
if (channel_get_user (chan, target) && channel_get_user (chan, c))
|
|
{
|
|
is_roommate = true;
|
|
break;
|
|
}
|
|
if ((target->mode & IRC_USER_MODE_INVISIBLE) && !is_roommate)
|
|
return;
|
|
|
|
if (irc_fnmatch (mask, target->hostname)
|
|
&& irc_fnmatch (mask, target->nickname)
|
|
&& irc_fnmatch (mask, target->realname)
|
|
&& irc_fnmatch (mask, c->ctx->server_name))
|
|
return;
|
|
|
|
// Try to find a channel they're on that's visible to us
|
|
struct channel *user_chan = NULL;
|
|
iter = str_map_iter_make (&c->ctx->channels);
|
|
while ((chan = str_map_iter_next (&iter)))
|
|
if (channel_get_user (chan, target)
|
|
&& (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
|
|
|| channel_get_user (chan, c)))
|
|
{
|
|
user_chan = chan;
|
|
break;
|
|
}
|
|
irc_send_rpl_whoreply (c, user_chan, target);
|
|
}
|
|
|
|
static void
|
|
irc_handle_who (const struct irc_message *msg, struct client *c)
|
|
{
|
|
bool only_ops = msg->params.len > 1 && !strcmp (msg->params.vector[1], "o");
|
|
|
|
const char *shown_mask = msg->params.vector[0], *used_mask;
|
|
if (!shown_mask)
|
|
used_mask = shown_mask = "*";
|
|
else if (!strcmp (shown_mask, "0"))
|
|
used_mask = "*";
|
|
else
|
|
used_mask = shown_mask;
|
|
|
|
struct channel *chan;
|
|
if ((chan = str_map_find (&c->ctx->channels, used_mask)))
|
|
{
|
|
bool on_chan = !!channel_get_user (chan, c);
|
|
if (on_chan || !(chan->modes & IRC_CHAN_MODE_SECRET))
|
|
for (struct channel_user *iter = chan->users;
|
|
iter; iter = iter->next)
|
|
{
|
|
if ((on_chan || !(iter->c->mode & IRC_USER_MODE_INVISIBLE))
|
|
&& (!only_ops || (iter->c->mode & IRC_USER_MODE_OPERATOR)))
|
|
irc_send_rpl_whoreply (c, chan, iter->c);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
|
|
struct client *target;
|
|
while ((target = str_map_iter_next (&iter)))
|
|
if (!only_ops || (target->mode & IRC_USER_MODE_OPERATOR))
|
|
irc_match_send_rpl_whoreply (c, target, used_mask);
|
|
}
|
|
irc_send_reply (c, IRC_RPL_ENDOFWHO, shown_mask);
|
|
}
|
|
|
|
static void
|
|
irc_send_whois_reply (struct client *c, const struct client *target)
|
|
{
|
|
const char *nick = target->nickname;
|
|
irc_send_reply (c, IRC_RPL_WHOISUSER, nick,
|
|
target->username, target->hostname, target->realname);
|
|
irc_send_reply (c, IRC_RPL_WHOISSERVER, nick, target->ctx->server_name,
|
|
str_map_find (&c->ctx->config, "server_info"));
|
|
if (target->mode & IRC_USER_MODE_OPERATOR)
|
|
irc_send_reply (c, IRC_RPL_WHOISOPERATOR, nick);
|
|
irc_send_reply (c, IRC_RPL_WHOISIDLE, nick,
|
|
(int) (time (NULL) - target->last_active));
|
|
if (target->away_message)
|
|
irc_send_reply (c, IRC_RPL_AWAY, nick, target->away_message);
|
|
|
|
struct strv channels = strv_make ();
|
|
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
|
|
struct channel *chan;
|
|
struct channel_user *channel_user;
|
|
while ((chan = str_map_iter_next (&iter)))
|
|
if ((channel_user = channel_get_user (chan, target))
|
|
&& (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
|
|
|| channel_get_user (chan, c)))
|
|
{
|
|
struct str item = str_make ();
|
|
if (channel_user->modes & IRC_CHAN_MODE_OPERATOR)
|
|
str_append_c (&item, '@');
|
|
else if (channel_user->modes & IRC_CHAN_MODE_VOICE)
|
|
str_append_c (&item, '+');
|
|
str_append (&item, chan->name);
|
|
strv_append_owned (&channels, str_steal (&item));
|
|
}
|
|
|
|
irc_send_reply_vector (c, IRC_RPL_WHOISCHANNELS, channels.vector, nick, "");
|
|
strv_free (&channels);
|
|
|
|
irc_send_reply (c, IRC_RPL_ENDOFWHOIS, nick);
|
|
}
|
|
|
|
static void
|
|
irc_handle_whois (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
|
|
|
|
struct strv masks = strv_make ();
|
|
const char *masks_str = msg->params.vector[msg->params.len > 1];
|
|
cstr_split (masks_str, ",", true, &masks);
|
|
for (size_t i = 0; i < masks.len; i++)
|
|
{
|
|
const char *mask = masks.vector[i];
|
|
struct client *target;
|
|
if (!strpbrk (mask, "*?"))
|
|
{
|
|
if (!(target = str_map_find (&c->ctx->users, mask)))
|
|
irc_send_reply (c, IRC_ERR_NOSUCHNICK, mask);
|
|
else
|
|
irc_send_whois_reply (c, target);
|
|
}
|
|
else
|
|
{
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
|
|
bool found = false;
|
|
while ((target = str_map_iter_next (&iter)))
|
|
if (!irc_fnmatch (mask, target->nickname))
|
|
{
|
|
irc_send_whois_reply (c, target);
|
|
found = true;
|
|
}
|
|
if (!found)
|
|
irc_send_reply (c, IRC_ERR_NOSUCHNICK, mask);
|
|
}
|
|
}
|
|
strv_free (&masks);
|
|
}
|
|
|
|
static void
|
|
irc_handle_whowas (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
if (msg->params.len > 2 && !irc_is_this_me (c->ctx, msg->params.vector[2]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[2]);
|
|
// The "count" parameter is ignored, we only store one entry for a nick
|
|
|
|
struct strv nicks = strv_make ();
|
|
cstr_split (msg->params.vector[0], ",", true, &nicks);
|
|
|
|
for (size_t i = 0; i < nicks.len; i++)
|
|
{
|
|
const char *nick = nicks.vector[i];
|
|
struct whowas_info *info = str_map_find (&c->ctx->whowas, nick);
|
|
if (!info)
|
|
irc_send_reply (c, IRC_ERR_WASNOSUCHNICK, nick);
|
|
else
|
|
{
|
|
irc_send_reply (c, IRC_RPL_WHOWASUSER, nick,
|
|
info->username, info->hostname, info->realname);
|
|
irc_send_reply (c, IRC_RPL_WHOISSERVER, nick, c->ctx->server_name,
|
|
str_map_find (&c->ctx->config, "server_info"));
|
|
}
|
|
irc_send_reply (c, IRC_RPL_ENDOFWHOWAS, nick);
|
|
}
|
|
strv_free (&nicks);
|
|
}
|
|
|
|
static void
|
|
irc_send_rpl_topic (struct client *c, struct channel *chan)
|
|
{
|
|
if (!*chan->topic)
|
|
irc_send_reply (c, IRC_RPL_NOTOPIC, chan->name);
|
|
else
|
|
{
|
|
irc_send_reply (c, IRC_RPL_TOPIC, chan->name, chan->topic);
|
|
irc_send_reply (c, IRC_RPL_TOPICWHOTIME,
|
|
chan->name, chan->topic_who, (long long) chan->topic_time);
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_handle_topic (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
const char *target = msg->params.vector[0];
|
|
struct channel *chan = str_map_find (&c->ctx->channels, target);
|
|
if (!chan)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, target);
|
|
|
|
if (msg->params.len < 2)
|
|
{
|
|
irc_send_rpl_topic (c, chan);
|
|
return;
|
|
}
|
|
|
|
struct channel_user *user = channel_get_user (chan, c);
|
|
if (!user)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, target);
|
|
|
|
if ((chan->modes & IRC_CHAN_MODE_PROTECTED_TOPIC)
|
|
&& !(user->modes & IRC_CHAN_MODE_OPERATOR))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, target);
|
|
|
|
cstr_set (&chan->topic, xstrdup (msg->params.vector[1]));
|
|
cstr_set (&chan->topic_who, xstrdup_printf
|
|
("%s!%s@%s", c->nickname, c->username, c->hostname));
|
|
chan->topic_time = time (NULL);
|
|
|
|
char *message = xstrdup_printf (":%s!%s@%s TOPIC %s :%s",
|
|
c->nickname, c->username, c->hostname, target, chan->topic);
|
|
irc_channel_multicast (chan, message, NULL);
|
|
free (message);
|
|
}
|
|
|
|
static void
|
|
irc_try_part (struct client *c, const char *channel_name, const char *reason)
|
|
{
|
|
if (!reason)
|
|
reason = c->nickname;
|
|
|
|
struct channel *chan;
|
|
if (!(chan = str_map_find (&c->ctx->channels, channel_name)))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, channel_name);
|
|
|
|
struct channel_user *user;
|
|
if (!(user = channel_get_user (chan, c)))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
|
|
|
|
char *message = xstrdup_printf (":%s!%s@%s PART %s :%s",
|
|
c->nickname, c->username, c->hostname, channel_name, reason);
|
|
if (!(chan->modes & IRC_CHAN_MODE_QUIET))
|
|
irc_channel_multicast (chan, message, NULL);
|
|
else
|
|
client_send (c, "%s", message);
|
|
free (message);
|
|
|
|
channel_remove_user (chan, user);
|
|
irc_channel_destroy_if_empty (c->ctx, chan);
|
|
}
|
|
|
|
static void
|
|
irc_part_all_channels (struct client *c)
|
|
{
|
|
// We have to be careful here, the channel might get destroyed
|
|
struct str_map_unset_iter iter =
|
|
str_map_unset_iter_make (&c->ctx->channels);
|
|
|
|
struct channel *chan;
|
|
while ((chan = str_map_unset_iter_next (&iter)))
|
|
if (channel_get_user (chan, c))
|
|
irc_try_part (c, chan->name, NULL);
|
|
str_map_unset_iter_free (&iter);
|
|
}
|
|
|
|
static void
|
|
irc_handle_part (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
const char *reason = msg->params.len > 1 ? msg->params.vector[1] : NULL;
|
|
struct strv channels = strv_make ();
|
|
cstr_split (msg->params.vector[0], ",", true, &channels);
|
|
for (size_t i = 0; i < channels.len; i++)
|
|
irc_try_part (c, channels.vector[i], reason);
|
|
strv_free (&channels);
|
|
}
|
|
|
|
static void
|
|
irc_try_kick (struct client *c, const char *channel_name, const char *nick,
|
|
const char *reason)
|
|
{
|
|
struct channel *chan;
|
|
if (!(chan = str_map_find (&c->ctx->channels, channel_name)))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, channel_name);
|
|
|
|
struct channel_user *user;
|
|
if (!(user = channel_get_user (chan, c)))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
|
|
if (!(user->modes & IRC_CHAN_MODE_OPERATOR))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, channel_name);
|
|
|
|
struct client *client;
|
|
if (!(client = str_map_find (&c->ctx->users, nick))
|
|
|| !(user = channel_get_user (chan, client)))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_USERNOTINCHANNEL, nick, channel_name);
|
|
|
|
char *message = xstrdup_printf (":%s!%s@%s KICK %s %s :%s",
|
|
c->nickname, c->username, c->hostname, channel_name, nick, reason);
|
|
if (!(chan->modes & IRC_CHAN_MODE_QUIET))
|
|
irc_channel_multicast (chan, message, NULL);
|
|
else
|
|
client_send (c, "%s", message);
|
|
free (message);
|
|
|
|
channel_remove_user (chan, user);
|
|
irc_channel_destroy_if_empty (c->ctx, chan);
|
|
}
|
|
|
|
static void
|
|
irc_handle_kick (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 2)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
const char *reason = c->nickname;
|
|
if (msg->params.len > 2)
|
|
reason = msg->params.vector[2];
|
|
|
|
struct strv channels = strv_make ();
|
|
cstr_split (msg->params.vector[0], ",", true, &channels);
|
|
struct strv users = strv_make ();
|
|
cstr_split (msg->params.vector[1], ",", true, &users);
|
|
|
|
if (channels.len == 1)
|
|
for (size_t i = 0; i < users.len; i++)
|
|
irc_try_kick (c, channels.vector[0], users.vector[i], reason);
|
|
else
|
|
for (size_t i = 0; i < channels.len && i < users.len; i++)
|
|
irc_try_kick (c, channels.vector[i], users.vector[i], reason);
|
|
|
|
strv_free (&channels);
|
|
strv_free (&users);
|
|
}
|
|
|
|
static void
|
|
irc_send_invite_notifications
|
|
(struct channel *chan, struct client *c, struct client *target)
|
|
{
|
|
for (struct channel_user *iter = chan->users; iter; iter = iter->next)
|
|
if (iter->c != target && iter->c->caps_enabled & IRC_CAP_INVITE_NOTIFY)
|
|
client_send (iter->c, ":%s!%s@%s INVITE %s %s",
|
|
c->nickname, c->username, c->hostname,
|
|
target->nickname, chan->name);
|
|
}
|
|
|
|
static void
|
|
irc_handle_invite (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 2)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
const char *target = msg->params.vector[0];
|
|
const char *channel_name = msg->params.vector[1];
|
|
|
|
struct client *client = str_map_find (&c->ctx->users, target);
|
|
if (!client)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHNICK, target);
|
|
|
|
struct channel *chan = str_map_find (&c->ctx->channels, channel_name);
|
|
if (chan)
|
|
{
|
|
struct channel_user *inviting_user;
|
|
if (!(inviting_user = channel_get_user (chan, c)))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
|
|
if (channel_get_user (chan, client))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_USERONCHANNEL, target, channel_name);
|
|
|
|
if ((inviting_user->modes & IRC_CHAN_MODE_OPERATOR))
|
|
str_map_set (&client->invites, channel_name, (void *) 1);
|
|
else if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, channel_name);
|
|
|
|
// It's not specified when and how we should send out invite-notify
|
|
if (chan->modes & IRC_CHAN_MODE_INVITE_ONLY)
|
|
irc_send_invite_notifications (chan, c, client);
|
|
}
|
|
|
|
client_send (client, ":%s!%s@%s INVITE %s %s",
|
|
c->nickname, c->username, c->hostname, client->nickname, channel_name);
|
|
if (client->away_message)
|
|
irc_send_reply (c, IRC_RPL_AWAY,
|
|
client->nickname, client->away_message);
|
|
irc_send_reply (c, IRC_RPL_INVITING, client->nickname, channel_name);
|
|
}
|
|
|
|
static void
|
|
irc_try_join (struct client *c, const char *channel_name, const char *key)
|
|
{
|
|
struct channel *chan = str_map_find (&c->ctx->channels, channel_name);
|
|
unsigned user_mode = 0;
|
|
if (!chan)
|
|
{
|
|
if (irc_validate_channel_name (channel_name) != VALIDATION_OK)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_BADCHANMASK, channel_name);
|
|
chan = irc_channel_create (c->ctx, channel_name);
|
|
user_mode = IRC_CHAN_MODE_OPERATOR;
|
|
}
|
|
else if (channel_get_user (chan, c))
|
|
return;
|
|
|
|
bool invited_by_chanop = !!str_map_find (&c->invites, channel_name);
|
|
if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY)
|
|
&& !client_in_mask_list (c, &chan->invite_list)
|
|
&& !invited_by_chanop)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_INVITEONLYCHAN, channel_name);
|
|
if (chan->key && (!key || strcmp (key, chan->key)))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_BADCHANNELKEY, channel_name);
|
|
if (chan->user_limit != -1
|
|
&& channel_user_count (chan) >= (size_t) chan->user_limit)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_CHANNELISFULL, channel_name);
|
|
if (client_in_mask_list (c, &chan->ban_list)
|
|
&& !client_in_mask_list (c, &chan->exception_list)
|
|
&& !invited_by_chanop)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_BANNEDFROMCHAN, channel_name);
|
|
|
|
// Destroy any invitation as there's no other way to get rid of it
|
|
str_map_set (&c->invites, channel_name, NULL);
|
|
|
|
channel_add_user (chan, c)->modes = user_mode;
|
|
|
|
char *message = xstrdup_printf (":%s!%s@%s JOIN %s",
|
|
c->nickname, c->username, c->hostname, channel_name);
|
|
if (!(chan->modes & IRC_CHAN_MODE_QUIET))
|
|
irc_channel_multicast (chan, message, NULL);
|
|
else
|
|
client_send (c, "%s", message);
|
|
free (message);
|
|
|
|
irc_send_rpl_topic (c, chan);
|
|
irc_send_rpl_namreply (c, chan, NULL);
|
|
irc_send_reply (c, IRC_RPL_ENDOFNAMES, chan->name);
|
|
}
|
|
|
|
static void
|
|
irc_handle_join (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
if (!strcmp (msg->params.vector[0], "0"))
|
|
{
|
|
irc_part_all_channels (c);
|
|
return;
|
|
}
|
|
|
|
struct strv channels = strv_make ();
|
|
cstr_split (msg->params.vector[0], ",", true, &channels);
|
|
struct strv keys = strv_make ();
|
|
if (msg->params.len > 1)
|
|
cstr_split (msg->params.vector[1], ",", true, &keys);
|
|
|
|
for (size_t i = 0; i < channels.len; i++)
|
|
irc_try_join (c, channels.vector[i],
|
|
i < keys.len ? keys.vector[i] : NULL);
|
|
|
|
strv_free (&channels);
|
|
strv_free (&keys);
|
|
}
|
|
|
|
static void
|
|
irc_handle_summon (const struct irc_message *msg, struct client *c)
|
|
{
|
|
(void) msg;
|
|
irc_send_reply (c, IRC_ERR_SUMMONDISABLED);
|
|
}
|
|
|
|
static void
|
|
irc_handle_users (const struct irc_message *msg, struct client *c)
|
|
{
|
|
(void) msg;
|
|
irc_send_reply (c, IRC_ERR_USERSDISABLED);
|
|
}
|
|
|
|
static void
|
|
irc_handle_away (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
{
|
|
cstr_set (&c->away_message, NULL);
|
|
irc_send_reply (c, IRC_RPL_UNAWAY);
|
|
}
|
|
else
|
|
{
|
|
cstr_set (&c->away_message, xstrdup (msg->params.vector[0]));
|
|
irc_send_reply (c, IRC_RPL_NOWAWAY);
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_handle_ison (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 1)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
|
|
struct str result = str_make ();
|
|
const char *nick;
|
|
if (str_map_find (&c->ctx->users, (nick = msg->params.vector[0])))
|
|
str_append (&result, nick);
|
|
for (size_t i = 1; i < msg->params.len; i++)
|
|
if (str_map_find (&c->ctx->users, (nick = msg->params.vector[i])))
|
|
str_append_printf (&result, " %s", nick);
|
|
|
|
irc_send_reply (c, IRC_RPL_ISON, result.str);
|
|
str_free (&result);
|
|
}
|
|
|
|
static void
|
|
irc_handle_admin (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
|
|
irc_send_reply (c, IRC_ERR_NOADMININFO, c->ctx->server_name);
|
|
}
|
|
|
|
static void
|
|
irc_handle_stats_links (struct client *c, const struct irc_message *msg)
|
|
{
|
|
// There is only an "l" query in RFC 2812 but we cannot link,
|
|
// so instead we provide the "L" query giving information for all users
|
|
const char *filter = NULL;
|
|
if (msg->params.len > 1)
|
|
filter = msg->params.vector[1];
|
|
|
|
for (struct client *iter = c->ctx->clients; iter; iter = iter->next)
|
|
{
|
|
if (filter && irc_strcmp (iter->nickname, filter))
|
|
continue;
|
|
irc_send_reply (c, IRC_RPL_STATSLINKINFO,
|
|
iter->address, // linkname
|
|
iter->write_buffer.len, // sendq
|
|
iter->n_sent_messages, iter->sent_bytes / 1024,
|
|
iter->n_received_messages, iter->received_bytes / 1024,
|
|
(long long) (time (NULL) - iter->opened));
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_handle_stats_commands (struct client *c)
|
|
{
|
|
struct str_map_iter iter = str_map_iter_make (&c->ctx->handlers);
|
|
struct irc_command *handler;
|
|
while ((handler = str_map_iter_next (&iter)))
|
|
{
|
|
if (!handler->n_received)
|
|
continue;
|
|
irc_send_reply (c, IRC_RPL_STATSCOMMANDS, handler->name,
|
|
handler->n_received, handler->bytes_received, (size_t) 0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_handle_stats_uptime (struct client *c)
|
|
{
|
|
time_t uptime = time (NULL) - c->ctx->started;
|
|
|
|
int days = uptime / 60 / 60 / 24;
|
|
int hours = (uptime % (60 * 60 * 24)) / 60 / 60;
|
|
int mins = (uptime % (60 * 60)) / 60;
|
|
int secs = uptime % 60;
|
|
|
|
irc_send_reply (c, IRC_RPL_STATSUPTIME, days, hours, mins, secs);
|
|
}
|
|
|
|
static void
|
|
irc_handle_stats (const struct irc_message *msg, struct client *c)
|
|
{
|
|
char query = 0;
|
|
if (msg->params.len > 0)
|
|
query = *msg->params.vector[0];
|
|
if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
|
|
if (!(c->mode & IRC_USER_MODE_OPERATOR))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
|
|
|
|
switch (query)
|
|
{
|
|
case 'L': irc_handle_stats_links (c, msg); break;
|
|
case 'm': irc_handle_stats_commands (c); break;
|
|
case 'u': irc_handle_stats_uptime (c); break;
|
|
}
|
|
|
|
irc_send_reply (c, IRC_RPL_ENDOFSTATS, query ? query : '*');
|
|
}
|
|
|
|
static void
|
|
irc_handle_links (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
|
|
|
|
const char *mask = "*";
|
|
if (msg->params.len > 0)
|
|
mask = msg->params.vector[msg->params.len > 1];
|
|
|
|
if (!irc_fnmatch (mask, c->ctx->server_name))
|
|
irc_send_reply (c, IRC_RPL_LINKS, mask,
|
|
c->ctx->server_name, 0 /* hop count */,
|
|
str_map_find (&c->ctx->config, "server_info"));
|
|
irc_send_reply (c, IRC_RPL_ENDOFLINKS, mask);
|
|
}
|
|
|
|
static void
|
|
irc_handle_kill (const struct irc_message *msg, struct client *c)
|
|
{
|
|
if (msg->params.len < 2)
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
|
|
if (!(c->mode & IRC_USER_MODE_OPERATOR))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
|
|
|
|
struct client *target;
|
|
if (!(target = str_map_find (&c->ctx->users, msg->params.vector[0])))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHNICK, msg->params.vector[0]);
|
|
|
|
client_send (target, ":%s!%s@%s KILL %s :%s",
|
|
c->nickname, c->username, c->hostname,
|
|
target->nickname, msg->params.vector[1]);
|
|
|
|
char *reason = xstrdup_printf ("Killed by %s: %s",
|
|
c->nickname, msg->params.vector[1]);
|
|
client_close_link (target, reason);
|
|
free (reason);
|
|
}
|
|
|
|
static void
|
|
irc_handle_die (const struct irc_message *msg, struct client *c)
|
|
{
|
|
(void) msg;
|
|
|
|
if (!(c->mode & IRC_USER_MODE_OPERATOR))
|
|
RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
|
|
if (!c->ctx->quitting)
|
|
irc_initiate_quit (c->ctx);
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
static void
|
|
irc_register_handlers (struct server_context *ctx)
|
|
{
|
|
// TODO: add an index for IRC_ERR_NOSUCHSERVER validation?
|
|
// TODO: add a minimal parameter count?
|
|
// TODO: add a field for oper-only commands?
|
|
static struct irc_command message_handlers[] =
|
|
{
|
|
{ "CAP", false, irc_handle_cap, 0, 0 },
|
|
{ "PASS", false, irc_handle_pass, 0, 0 },
|
|
{ "NICK", false, irc_handle_nick, 0, 0 },
|
|
{ "USER", false, irc_handle_user, 0, 0 },
|
|
|
|
{ "USERHOST", true, irc_handle_userhost, 0, 0 },
|
|
{ "LUSERS", true, irc_handle_lusers, 0, 0 },
|
|
{ "MOTD", true, irc_handle_motd, 0, 0 },
|
|
{ "PING", true, irc_handle_ping, 0, 0 },
|
|
{ "PONG", false, irc_handle_pong, 0, 0 },
|
|
{ "QUIT", false, irc_handle_quit, 0, 0 },
|
|
{ "TIME", true, irc_handle_time, 0, 0 },
|
|
{ "VERSION", true, irc_handle_version, 0, 0 },
|
|
{ "USERS", true, irc_handle_users, 0, 0 },
|
|
{ "SUMMON", true, irc_handle_summon, 0, 0 },
|
|
{ "AWAY", true, irc_handle_away, 0, 0 },
|
|
{ "ADMIN", true, irc_handle_admin, 0, 0 },
|
|
{ "STATS", true, irc_handle_stats, 0, 0 },
|
|
{ "LINKS", true, irc_handle_links, 0, 0 },
|
|
|
|
{ "MODE", true, irc_handle_mode, 0, 0 },
|
|
{ "PRIVMSG", true, irc_handle_privmsg, 0, 0 },
|
|
{ "NOTICE", true, irc_handle_notice, 0, 0 },
|
|
{ "JOIN", true, irc_handle_join, 0, 0 },
|
|
{ "PART", true, irc_handle_part, 0, 0 },
|
|
{ "KICK", true, irc_handle_kick, 0, 0 },
|
|
{ "INVITE", true, irc_handle_invite, 0, 0 },
|
|
{ "TOPIC", true, irc_handle_topic, 0, 0 },
|
|
{ "LIST", true, irc_handle_list, 0, 0 },
|
|
{ "NAMES", true, irc_handle_names, 0, 0 },
|
|
{ "WHO", true, irc_handle_who, 0, 0 },
|
|
{ "WHOIS", true, irc_handle_whois, 0, 0 },
|
|
{ "WHOWAS", true, irc_handle_whowas, 0, 0 },
|
|
{ "ISON", true, irc_handle_ison, 0, 0 },
|
|
|
|
{ "KILL", true, irc_handle_kill, 0, 0 },
|
|
{ "DIE", true, irc_handle_die, 0, 0 },
|
|
};
|
|
|
|
for (size_t i = 0; i < N_ELEMENTS (message_handlers); i++)
|
|
{
|
|
const struct irc_command *cmd = &message_handlers[i];
|
|
str_map_set (&ctx->handlers, cmd->name, (void *) cmd);
|
|
}
|
|
}
|
|
|
|
static void
|
|
irc_process_message (const struct irc_message *msg,
|
|
const char *raw, void *user_data)
|
|
{
|
|
struct client *c = user_data;
|
|
if (c->closing_link)
|
|
return;
|
|
|
|
c->n_received_messages++;
|
|
c->received_bytes += strlen (raw) + 2;
|
|
|
|
if (!flood_detector_check (&c->antiflood))
|
|
{
|
|
client_close_link (c, "Excess flood");
|
|
return;
|
|
}
|
|
|
|
struct irc_command *cmd = str_map_find (&c->ctx->handlers, msg->command);
|
|
if (!cmd)
|
|
irc_send_reply (c, IRC_ERR_UNKNOWNCOMMAND, msg->command);
|
|
else
|
|
{
|
|
cmd->n_received++;
|
|
cmd->bytes_received += strlen (raw) + 2;
|
|
|
|
if (cmd->requires_registration && !c->registered)
|
|
irc_send_reply (c, IRC_ERR_NOTREGISTERED);
|
|
else
|
|
cmd->handler (msg, c);
|
|
}
|
|
}
|
|
|
|
// --- Network I/O -------------------------------------------------------------
|
|
|
|
static bool
|
|
irc_try_read (struct client *c)
|
|
{
|
|
struct str *buf = &c->read_buffer;
|
|
ssize_t n_read;
|
|
|
|
while (true)
|
|
{
|
|
str_reserve (buf, 512);
|
|
n_read = read (c->socket_fd, buf->str + buf->len,
|
|
buf->alloc - buf->len - 1 /* null byte */);
|
|
|
|
if (n_read > 0)
|
|
{
|
|
buf->str[buf->len += n_read] = '\0';
|
|
// TODO: discard characters above the 512 character limit
|
|
irc_process_buffer (buf, irc_process_message, c);
|
|
continue;
|
|
}
|
|
if (n_read == 0)
|
|
{
|
|
client_kill (c, NULL);
|
|
return false;
|
|
}
|
|
|
|
if (errno == EAGAIN)
|
|
return true;
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
print_debug ("%s: %s: %s", __func__, "read", strerror (errno));
|
|
client_kill (c, strerror (errno));
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool
|
|
irc_try_read_tls (struct client *c)
|
|
{
|
|
if (c->ssl_tx_want_rx)
|
|
return true;
|
|
|
|
struct str *buf = &c->read_buffer;
|
|
c->ssl_rx_want_tx = false;
|
|
while (true)
|
|
{
|
|
str_reserve (buf, 512);
|
|
ERR_clear_error ();
|
|
int n_read = SSL_read (c->ssl, buf->str + buf->len,
|
|
buf->alloc - buf->len - 1 /* null byte */);
|
|
|
|
const char *error_info = NULL;
|
|
switch (xssl_get_error (c->ssl, n_read, &error_info))
|
|
{
|
|
case SSL_ERROR_NONE:
|
|
buf->str[buf->len += n_read] = '\0';
|
|
// TODO: discard characters above the 512 character limit
|
|
irc_process_buffer (buf, irc_process_message, c);
|
|
continue;
|
|
case SSL_ERROR_ZERO_RETURN:
|
|
client_kill (c, NULL);
|
|
return false;
|
|
case SSL_ERROR_WANT_READ:
|
|
return true;
|
|
case SSL_ERROR_WANT_WRITE:
|
|
c->ssl_rx_want_tx = true;
|
|
return true;
|
|
case XSSL_ERROR_TRY_AGAIN:
|
|
continue;
|
|
default:
|
|
print_debug ("%s: %s: %s", __func__, "SSL_read", error_info);
|
|
client_kill (c, error_info);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool
|
|
irc_try_write (struct client *c)
|
|
{
|
|
struct str *buf = &c->write_buffer;
|
|
ssize_t n_written;
|
|
|
|
while (buf->len)
|
|
{
|
|
n_written = write (c->socket_fd, buf->str, buf->len);
|
|
if (n_written >= 0)
|
|
{
|
|
str_remove_slice (buf, 0, n_written);
|
|
continue;
|
|
}
|
|
|
|
if (errno == EAGAIN)
|
|
return true;
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
print_debug ("%s: %s: %s", __func__, "write", strerror (errno));
|
|
client_kill (c, strerror (errno));
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
irc_try_write_tls (struct client *c)
|
|
{
|
|
if (c->ssl_rx_want_tx)
|
|
return true;
|
|
|
|
struct str *buf = &c->write_buffer;
|
|
c->ssl_tx_want_rx = false;
|
|
while (buf->len)
|
|
{
|
|
ERR_clear_error ();
|
|
int n_written = SSL_write (c->ssl, buf->str, buf->len);
|
|
|
|
const char *error_info = NULL;
|
|
switch (xssl_get_error (c->ssl, n_written, &error_info))
|
|
{
|
|
case SSL_ERROR_NONE:
|
|
str_remove_slice (buf, 0, n_written);
|
|
continue;
|
|
case SSL_ERROR_ZERO_RETURN:
|
|
client_kill (c, NULL);
|
|
return false;
|
|
case SSL_ERROR_WANT_WRITE:
|
|
return true;
|
|
case SSL_ERROR_WANT_READ:
|
|
c->ssl_tx_want_rx = true;
|
|
return true;
|
|
case XSSL_ERROR_TRY_AGAIN:
|
|
continue;
|
|
default:
|
|
print_debug ("%s: %s: %s", __func__, "SSL_write", error_info);
|
|
client_kill (c, error_info);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
static bool
|
|
irc_autodetect_tls (struct client *c)
|
|
{
|
|
// Trivial SSL/TLS autodetection. The first block of data returned by
|
|
// recv() must be at least three bytes long for this to work reliably,
|
|
// but that should not pose a problem in practice.
|
|
//
|
|
// SSL2: 1xxx xxxx | xxxx xxxx | <1>
|
|
// (message length) (client hello)
|
|
// SSL3/TLS: <22> | <3> | xxxx xxxx
|
|
// (handshake)| (protocol version)
|
|
//
|
|
// Such byte sequences should never occur at the beginning of regular IRC
|
|
// communication, which usually begins with USER/NICK/PASS/SERVICE.
|
|
|
|
char buf[3];
|
|
start:
|
|
switch (recv (c->socket_fd, buf, sizeof buf, MSG_PEEK))
|
|
{
|
|
case 3:
|
|
if ((buf[0] & 0x80) && buf[2] == 1)
|
|
return true;
|
|
// Fall-through
|
|
case 2:
|
|
if (buf[0] == 22 && buf[1] == 3)
|
|
return true;
|
|
break;
|
|
case 1:
|
|
if (buf[0] == 22)
|
|
return true;
|
|
break;
|
|
case 0:
|
|
break;
|
|
default:
|
|
if (errno == EINTR)
|
|
goto start;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool
|
|
client_initialize_tls (struct client *c)
|
|
{
|
|
const char *error_info = NULL;
|
|
if (!c->ctx->ssl_ctx)
|
|
{
|
|
error_info = "TLS support disabled";
|
|
goto error_ssl_1;
|
|
}
|
|
|
|
ERR_clear_error ();
|
|
|
|
c->ssl = SSL_new (c->ctx->ssl_ctx);
|
|
if (!c->ssl)
|
|
goto error_ssl_2;
|
|
if (!SSL_set_fd (c->ssl, c->socket_fd))
|
|
goto error_ssl_3;
|
|
|
|
SSL_set_accept_state (c->ssl);
|
|
return true;
|
|
|
|
error_ssl_3:
|
|
SSL_free (c->ssl);
|
|
c->ssl = NULL;
|
|
error_ssl_2:
|
|
error_info = xerr_describe_error ();
|
|
error_ssl_1:
|
|
print_debug ("could not initialize TLS for %s: %s", c->address, error_info);
|
|
return false;
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
static void
|
|
on_client_ready (const struct pollfd *pfd, void *user_data)
|
|
{
|
|
struct client *c = user_data;
|
|
if (!c->initialized)
|
|
{
|
|
hard_assert (pfd->events == POLLIN);
|
|
if (irc_autodetect_tls (c) && !client_initialize_tls (c))
|
|
{
|
|
client_kill (c, NULL);
|
|
return;
|
|
}
|
|
c->initialized = true;
|
|
client_set_ping_timer (c);
|
|
}
|
|
|
|
if (c->ssl)
|
|
{
|
|
// Reads may want to write, writes may want to read, poll() may
|
|
// return unexpected things in `revents'... let's try both
|
|
if (!irc_try_read_tls (c) || !irc_try_write_tls (c))
|
|
return;
|
|
}
|
|
else if (!irc_try_read (c) || !irc_try_write (c))
|
|
return;
|
|
|
|
client_update_poller (c, pfd);
|
|
|
|
// The purpose of the `closing_link' state is to transfer the `ERROR'
|
|
if (c->closing_link && !c->half_closed && !c->write_buffer.len)
|
|
{
|
|
// To make sure the client has received our ERROR message, we must
|
|
// first half-close the connection, otherwise it could happen that they
|
|
// receive a RST from our TCP stack first when we receive further data
|
|
|
|
// We only send the "close notify" alert if libssl can write to the
|
|
// socket at this moment. All the other data has been already written,
|
|
// though, and the client will receive a TCP half-close as usual, so
|
|
// it's not that important if the alert actually gets through.
|
|
if (c->ssl)
|
|
(void) SSL_shutdown (c->ssl);
|
|
|
|
// Either the shutdown succeeds, in which case we set a flag so that
|
|
// we don't retry this action and wait until we get an EOF, or it fails
|
|
// and we just kill the client straight away
|
|
if (!shutdown (c->socket_fd, SHUT_WR))
|
|
c->half_closed = true;
|
|
else
|
|
client_kill (c, NULL);
|
|
}
|
|
}
|
|
|
|
static void
|
|
client_update_poller (struct client *c, const struct pollfd *pfd)
|
|
{
|
|
// We must not poll for writing when the connection hasn't been initialized
|
|
int new_events = POLLIN;
|
|
if (c->ssl)
|
|
{
|
|
if (c->write_buffer.len || c->ssl_rx_want_tx)
|
|
new_events |= POLLOUT;
|
|
|
|
// While we're waiting for an opposite event, we ignore the original
|
|
if (c->ssl_rx_want_tx) new_events &= ~POLLIN;
|
|
if (c->ssl_tx_want_rx) new_events &= ~POLLOUT;
|
|
}
|
|
else if (c->initialized && c->write_buffer.len)
|
|
new_events |= POLLOUT;
|
|
|
|
hard_assert (new_events != 0);
|
|
if (!pfd || pfd->events != new_events)
|
|
poller_fd_set (&c->socket_event, new_events);
|
|
}
|
|
|
|
static void
|
|
client_finish_connection (struct client *c)
|
|
{
|
|
c->gni = NULL;
|
|
|
|
c->address = format_host_port_pair (c->hostname, c->port);
|
|
print_debug ("accepted connection from %s", c->address);
|
|
|
|
client_update_poller (c, NULL);
|
|
client_set_kill_timer (c);
|
|
}
|
|
|
|
static void
|
|
on_client_gni_resolved (int result, char *host, char *port, void *user_data)
|
|
{
|
|
struct client *c = user_data;
|
|
|
|
if (result)
|
|
print_debug ("%s: %s", "getnameinfo", gai_strerror (result));
|
|
else
|
|
{
|
|
cstr_set (&c->hostname, xstrdup (host));
|
|
(void) port;
|
|
}
|
|
|
|
poller_timer_reset (&c->gni_timer);
|
|
client_finish_connection (c);
|
|
}
|
|
|
|
static void
|
|
on_client_gni_timer (struct client *c)
|
|
{
|
|
async_cancel (&c->gni->async);
|
|
client_finish_connection (c);
|
|
}
|
|
|
|
static bool
|
|
irc_try_fetch_client (struct server_context *ctx, int listen_fd)
|
|
{
|
|
// XXX: `struct sockaddr_storage' is not the most portable thing
|
|
struct sockaddr_storage peer;
|
|
socklen_t peer_len = sizeof peer;
|
|
|
|
int fd = accept (listen_fd, (struct sockaddr *) &peer, &peer_len);
|
|
if (fd == -1)
|
|
{
|
|
if (errno == EAGAIN || errno == EWOULDBLOCK)
|
|
return false;
|
|
if (errno == EINTR)
|
|
return true;
|
|
|
|
if (errno == EBADF
|
|
|| errno == EINVAL
|
|
|| errno == ENOTSOCK
|
|
|| errno == EOPNOTSUPP)
|
|
print_fatal ("%s: %s", "accept", strerror (errno));
|
|
|
|
// OS kernels may return a wide range of unforeseeable errors.
|
|
// Assuming that they're either transient or caused by
|
|
// a connection that we've just extracted from the queue.
|
|
print_warning ("%s: %s", "accept", strerror (errno));
|
|
return true;
|
|
}
|
|
|
|
hard_assert (peer_len <= sizeof peer);
|
|
set_blocking (fd, false);
|
|
|
|
// A little bit questionable once the traffic gets high enough (IMO),
|
|
// but it reduces silly latencies that we don't need because we already
|
|
// do buffer our output
|
|
int yes = 1;
|
|
soft_assert (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY,
|
|
&yes, sizeof yes) != -1);
|
|
|
|
if (ctx->max_connections != 0 && ctx->n_clients >= ctx->max_connections)
|
|
{
|
|
print_debug ("connection limit reached, refusing connection");
|
|
close (fd);
|
|
return true;
|
|
}
|
|
|
|
char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown";
|
|
int err = getnameinfo ((struct sockaddr *) &peer, peer_len,
|
|
host, sizeof host, port, sizeof port, NI_NUMERICHOST | NI_NUMERICSERV);
|
|
if (err)
|
|
print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
|
|
|
|
struct client *c = client_new ();
|
|
c->ctx = ctx;
|
|
c->opened = time (NULL);
|
|
c->socket_fd = fd;
|
|
c->hostname = xstrdup (host);
|
|
c->port = xstrdup (port);
|
|
c->last_active = time (NULL);
|
|
LIST_PREPEND (ctx->clients, c);
|
|
ctx->n_clients++;
|
|
|
|
c->socket_event = poller_fd_make (&c->ctx->poller, c->socket_fd);
|
|
c->socket_event.dispatcher = (poller_fd_fn) on_client_ready;
|
|
c->socket_event.user_data = c;
|
|
|
|
c->kill_timer = poller_timer_make (&c->ctx->poller);
|
|
c->kill_timer.dispatcher = (poller_timer_fn) on_client_kill_timer;
|
|
c->kill_timer.user_data = c;
|
|
|
|
c->timeout_timer = poller_timer_make (&c->ctx->poller);
|
|
c->timeout_timer.dispatcher = (poller_timer_fn) on_client_timeout_timer;
|
|
c->timeout_timer.user_data = c;
|
|
|
|
c->ping_timer = poller_timer_make (&c->ctx->poller);
|
|
c->ping_timer.dispatcher = (poller_timer_fn) on_client_ping_timer;
|
|
c->ping_timer.user_data = c;
|
|
|
|
// Resolve the client's hostname first; this is a blocking operation that
|
|
// depends on the network, so run it asynchronously with some timeout
|
|
c->gni = async_getnameinfo (&ctx->poller.common.async,
|
|
(const struct sockaddr *) &peer, peer_len, NI_NUMERICSERV);
|
|
c->gni->dispatcher = on_client_gni_resolved;
|
|
c->gni->user_data = c;
|
|
|
|
c->gni_timer = poller_timer_make (&c->ctx->poller);
|
|
c->gni_timer.dispatcher = (poller_timer_fn) on_client_gni_timer;
|
|
c->gni_timer.user_data = c;
|
|
|
|
poller_timer_set (&c->gni_timer, 5000);
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
on_irc_client_available (const struct pollfd *pfd, void *user_data)
|
|
{
|
|
struct server_context *ctx = user_data;
|
|
while (irc_try_fetch_client (ctx, pfd->fd))
|
|
;
|
|
}
|
|
|
|
// --- Application setup -------------------------------------------------------
|
|
|
|
static int
|
|
irc_ssl_verify_callback (int verify_ok, X509_STORE_CTX *ctx)
|
|
{
|
|
(void) verify_ok;
|
|
(void) ctx;
|
|
|
|
// RFC 5246: "If the client has sent a certificate with signing ability,
|
|
// a digitally-signed CertificateVerify message is sent to explicitly
|
|
// verify possession of the private key in the certificate."
|
|
//
|
|
// The handshake will fail if the client doesn't have a matching private
|
|
// key, see OpenSSL's tls_process_cert_verify(), and the CertificateVerify
|
|
// message cannot be skipped (except for a case where it doesn't matter).
|
|
// Thus we're fine checking just the cryptographic hash of the certificate.
|
|
|
|
// We only want to provide additional privileges based on the client's
|
|
// certificate, so let's not terminate the connection because of a failure
|
|
// (especially since self-signed certificates are likely to be used).
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
irc_ssl_info_callback (const SSL *ssl, int where, int ret)
|
|
{
|
|
// For debugging only; provides us with the most important information
|
|
|
|
struct str s = str_make ();
|
|
if (where & SSL_CB_LOOP)
|
|
str_append_printf (&s, "loop (%s) ",
|
|
SSL_state_string_long (ssl));
|
|
if (where & SSL_CB_EXIT)
|
|
str_append_printf (&s, "exit (%d in %s) ", ret,
|
|
SSL_state_string_long (ssl));
|
|
|
|
if (where & SSL_CB_READ) str_append (&s, "read ");
|
|
if (where & SSL_CB_WRITE) str_append (&s, "write ");
|
|
|
|
if (where & SSL_CB_ALERT)
|
|
str_append_printf (&s, "alert (%s: %s) ",
|
|
SSL_alert_type_string_long (ret),
|
|
SSL_alert_desc_string_long (ret));
|
|
|
|
if (where & SSL_CB_HANDSHAKE_START) str_append (&s, "handshake start ");
|
|
if (where & SSL_CB_HANDSHAKE_DONE) str_append (&s, "handshake done ");
|
|
|
|
print_debug ("ssl <%p> %s", ssl, s.str);
|
|
str_free (&s);
|
|
}
|
|
|
|
static bool
|
|
irc_initialize_ssl_ctx (struct server_context *ctx,
|
|
const char *cert_path, const char *key_path, struct error **e)
|
|
{
|
|
ERR_clear_error ();
|
|
|
|
ctx->ssl_ctx = SSL_CTX_new (SSLv23_server_method ());
|
|
if (!ctx->ssl_ctx)
|
|
{
|
|
error_set (e, "%s: %s", "could not initialize TLS",
|
|
xerr_describe_error ());
|
|
return false;
|
|
}
|
|
SSL_CTX_set_verify (ctx->ssl_ctx,
|
|
SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, irc_ssl_verify_callback);
|
|
|
|
if (g_debug_mode)
|
|
SSL_CTX_set_info_callback (ctx->ssl_ctx, irc_ssl_info_callback);
|
|
|
|
const unsigned char session_id_context[SSL_MAX_SSL_SESSION_ID_LENGTH]
|
|
= PROGRAM_NAME;
|
|
(void) SSL_CTX_set_session_id_context (ctx->ssl_ctx,
|
|
session_id_context, sizeof session_id_context);
|
|
|
|
// IRC is not particularly reconnect-heavy, prefer forward secrecy
|
|
SSL_CTX_set_session_cache_mode (ctx->ssl_ctx, SSL_SESS_CACHE_OFF);
|
|
|
|
// Gah, spare me your awkward semantics, I just want to push data!
|
|
SSL_CTX_set_mode (ctx->ssl_ctx,
|
|
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
|
|
|
|
// Disable deprecated protocols (see RFC 7568)
|
|
SSL_CTX_set_options (ctx->ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
|
|
|
|
// XXX: perhaps we should read the files ourselves for better messages
|
|
const char *ciphers = str_map_find (&ctx->config, "tls_ciphers");
|
|
if (!SSL_CTX_set_cipher_list (ctx->ssl_ctx, ciphers))
|
|
error_set (e, "failed to select any cipher from the cipher list");
|
|
else if (!SSL_CTX_use_certificate_chain_file (ctx->ssl_ctx, cert_path))
|
|
error_set (e, "%s: %s", "setting the TLS certificate failed",
|
|
xerr_describe_error ());
|
|
else if (!SSL_CTX_use_PrivateKey_file
|
|
(ctx->ssl_ctx, key_path, SSL_FILETYPE_PEM))
|
|
error_set (e, "%s: %s", "setting the TLS private key failed",
|
|
xerr_describe_error ());
|
|
else
|
|
// TODO: SSL_CTX_check_private_key()? It has probably already been
|
|
// checked by SSL_CTX_use_PrivateKey_file() above.
|
|
return true;
|
|
|
|
SSL_CTX_free (ctx->ssl_ctx);
|
|
ctx->ssl_ctx = NULL;
|
|
return false;
|
|
}
|
|
|
|
static bool
|
|
irc_initialize_tls (struct server_context *ctx, struct error **e)
|
|
{
|
|
const char *tls_cert = str_map_find (&ctx->config, "tls_cert");
|
|
const char *tls_key = str_map_find (&ctx->config, "tls_key");
|
|
|
|
// Only try to enable SSL support if the user configures it; it is not
|
|
// a failure if no one has requested it.
|
|
if (!tls_cert && !tls_key)
|
|
return true;
|
|
|
|
if (!tls_cert)
|
|
error_set (e, "no TLS certificate set");
|
|
else if (!tls_key)
|
|
error_set (e, "no TLS private key set");
|
|
if (!tls_cert || !tls_key)
|
|
return false;
|
|
|
|
bool result = false;
|
|
|
|
char *cert_path = resolve_filename
|
|
(tls_cert, resolve_relative_config_filename);
|
|
char *key_path = resolve_filename
|
|
(tls_key, resolve_relative_config_filename);
|
|
if (!cert_path)
|
|
error_set (e, "%s: %s", "cannot open file", tls_cert);
|
|
else if (!key_path)
|
|
error_set (e, "%s: %s", "cannot open file", tls_key);
|
|
else
|
|
result = irc_initialize_ssl_ctx (ctx, cert_path, key_path, e);
|
|
|
|
free (cert_path);
|
|
free (key_path);
|
|
return result;
|
|
}
|
|
|
|
static bool
|
|
irc_initialize_catalog (struct server_context *ctx, struct error **e)
|
|
{
|
|
hard_assert (ctx->catalog == (nl_catd) -1);
|
|
const char *catalog = str_map_find (&ctx->config, "catalog");
|
|
if (!catalog)
|
|
return true;
|
|
|
|
char *path = resolve_filename (catalog, resolve_relative_config_filename);
|
|
if (!path)
|
|
{
|
|
error_set (e, "%s: %s", "cannot open file", catalog);
|
|
return false;
|
|
}
|
|
ctx->catalog = catopen (path, NL_CAT_LOCALE);
|
|
free (path);
|
|
|
|
if (ctx->catalog == (nl_catd) -1)
|
|
{
|
|
error_set (e, "%s: %s",
|
|
"failed reading the message catalog file", strerror (errno));
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
irc_initialize_motd (struct server_context *ctx, struct error **e)
|
|
{
|
|
hard_assert (ctx->motd.len == 0);
|
|
const char *motd = str_map_find (&ctx->config, "motd");
|
|
if (!motd)
|
|
return true;
|
|
|
|
char *path = resolve_filename (motd, resolve_relative_config_filename);
|
|
if (!path)
|
|
{
|
|
error_set (e, "%s: %s", "cannot open file", motd);
|
|
return false;
|
|
}
|
|
FILE *fp = fopen (path, "r");
|
|
free (path);
|
|
|
|
if (!fp)
|
|
{
|
|
error_set (e, "%s: %s",
|
|
"failed reading the MOTD file", strerror (errno));
|
|
return false;
|
|
}
|
|
|
|
struct str line = str_make ();
|
|
while (read_line (fp, &line))
|
|
strv_append_owned (&ctx->motd, str_steal (&line));
|
|
str_free (&line);
|
|
|
|
fclose (fp);
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
irc_parse_config_unsigned (const char *name, const char *value, unsigned *out,
|
|
unsigned long min, unsigned long max, struct error **e)
|
|
{
|
|
unsigned long ul;
|
|
hard_assert (value != NULL);
|
|
if (!xstrtoul (&ul, value, 10) || ul > max || ul < min)
|
|
{
|
|
error_set (e, "invalid configuration value for `%s': %s",
|
|
name, "the number is invalid or out of range");
|
|
return false;
|
|
}
|
|
*out = ul;
|
|
return true;
|
|
}
|
|
|
|
/// This function handles values that require validation before their first use,
|
|
/// or some kind of a transformation (such as conversion to an integer) needs
|
|
/// to be done before they can be used directly.
|
|
static bool
|
|
irc_parse_config (struct server_context *ctx, struct error **e)
|
|
{
|
|
#define PARSE_UNSIGNED(name, min, max) \
|
|
irc_parse_config_unsigned (#name, str_map_find (&ctx->config, #name), \
|
|
&ctx->name, min, max, e)
|
|
|
|
if (!PARSE_UNSIGNED (ping_interval, 1, UINT_MAX)
|
|
|| !PARSE_UNSIGNED (max_connections, 0, UINT_MAX))
|
|
return false;
|
|
|
|
bool result = true;
|
|
struct strv fingerprints = strv_make ();
|
|
const char *operators = str_map_find (&ctx->config, "operators");
|
|
if (operators)
|
|
cstr_split (operators, ",", true, &fingerprints);
|
|
for (size_t i = 0; i < fingerprints.len; i++)
|
|
{
|
|
const char *key = fingerprints.vector[i];
|
|
if (!irc_is_valid_fingerprint (key))
|
|
{
|
|
error_set (e, "invalid configuration value for `%s': %s",
|
|
"operators", "invalid fingerprint value");
|
|
result = false;
|
|
break;
|
|
}
|
|
str_map_set (&ctx->operators, key, (void *) 1);
|
|
}
|
|
strv_free (&fingerprints);
|
|
return result;
|
|
}
|
|
|
|
static bool
|
|
irc_initialize_server_name (struct server_context *ctx, struct error **e)
|
|
{
|
|
enum validation_result res;
|
|
const char *server_name = str_map_find (&ctx->config, "server_name");
|
|
if (server_name)
|
|
{
|
|
res = irc_validate_hostname (server_name);
|
|
if (res != VALIDATION_OK)
|
|
{
|
|
error_set (e, "invalid configuration value for `%s': %s",
|
|
"server_name", irc_validate_to_str (res));
|
|
return false;
|
|
}
|
|
ctx->server_name = xstrdup (server_name);
|
|
}
|
|
else
|
|
{
|
|
long host_name_max = sysconf (_SC_HOST_NAME_MAX);
|
|
if (host_name_max <= 0)
|
|
host_name_max = _POSIX_HOST_NAME_MAX;
|
|
|
|
char hostname[host_name_max + 1];
|
|
if (gethostname (hostname, sizeof hostname))
|
|
{
|
|
error_set (e, "%s: %s",
|
|
"getting the hostname failed", strerror (errno));
|
|
return false;
|
|
}
|
|
res = irc_validate_hostname (hostname);
|
|
if (res != VALIDATION_OK)
|
|
{
|
|
error_set (e,
|
|
"`%s' is not set and the hostname (`%s') cannot be used: %s",
|
|
"server_name", hostname, irc_validate_to_str (res));
|
|
return false;
|
|
}
|
|
ctx->server_name = xstrdup (hostname);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
irc_lock_pid_file (struct server_context *ctx, struct error **e)
|
|
{
|
|
const char *path = str_map_find (&ctx->config, "pid_file");
|
|
if (!path)
|
|
return true;
|
|
|
|
char *resolved = resolve_filename (path, resolve_relative_runtime_filename);
|
|
bool result = lock_pid_file (resolved, e) != -1;
|
|
free (resolved);
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
irc_listen (struct addrinfo *gai_iter)
|
|
{
|
|
int fd = socket (gai_iter->ai_family,
|
|
gai_iter->ai_socktype, gai_iter->ai_protocol);
|
|
if (fd == -1)
|
|
return -1;
|
|
set_cloexec (fd);
|
|
|
|
int yes = 1;
|
|
soft_assert (setsockopt (fd, SOL_SOCKET, SO_KEEPALIVE,
|
|
&yes, sizeof yes) != -1);
|
|
soft_assert (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
|
|
&yes, sizeof yes) != -1);
|
|
|
|
#if defined SOL_IPV6 && defined IPV6_V6ONLY
|
|
// Make NULL always bind to both IPv4 and IPv6, irrespectively of the order
|
|
// of results; only INADDR6_ANY seems to be affected by this
|
|
if (gai_iter->ai_family == AF_INET6)
|
|
soft_assert (setsockopt (fd, SOL_IPV6, IPV6_V6ONLY,
|
|
&yes, sizeof yes) != -1);
|
|
#endif
|
|
|
|
char host[NI_MAXHOST], port[NI_MAXSERV];
|
|
host[0] = port[0] = '\0';
|
|
int err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen,
|
|
host, sizeof host, port, sizeof port,
|
|
NI_NUMERICHOST | NI_NUMERICSERV);
|
|
if (err)
|
|
print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
|
|
|
|
char *address = format_host_port_pair (host, port);
|
|
if (bind (fd, gai_iter->ai_addr, gai_iter->ai_addrlen))
|
|
print_error ("bind to %s failed: %s", address, strerror (errno));
|
|
else if (listen (fd, 16 /* arbitrary number */))
|
|
print_error ("listen on %s failed: %s", address, strerror (errno));
|
|
else
|
|
{
|
|
print_status ("listening on %s", address);
|
|
free (address);
|
|
return fd;
|
|
}
|
|
|
|
free (address);
|
|
xclose (fd);
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
irc_listen_resolve (struct server_context *ctx,
|
|
const char *host, const char *port, struct addrinfo *gai_hints)
|
|
{
|
|
struct addrinfo *gai_result, *gai_iter;
|
|
int err = getaddrinfo (host, port, gai_hints, &gai_result);
|
|
if (err)
|
|
{
|
|
char *address = format_host_port_pair (host, port);
|
|
print_error ("bind to %s failed: %s: %s",
|
|
address, "getaddrinfo", gai_strerror (err));
|
|
free (address);
|
|
return;
|
|
}
|
|
|
|
int fd;
|
|
for (gai_iter = gai_result; gai_iter; gai_iter = gai_iter->ai_next)
|
|
{
|
|
if (ctx->listen_len == ctx->listen_alloc)
|
|
break;
|
|
|
|
if ((fd = irc_listen (gai_iter)) == -1)
|
|
continue;
|
|
set_blocking (fd, false);
|
|
|
|
struct poller_fd *event = &ctx->listen_events[ctx->listen_len];
|
|
*event = poller_fd_make (&ctx->poller, fd);
|
|
event->dispatcher = (poller_fd_fn) on_irc_client_available;
|
|
event->user_data = ctx;
|
|
|
|
ctx->listen_fds[ctx->listen_len++] = fd;
|
|
poller_fd_set (event, POLLIN);
|
|
}
|
|
freeaddrinfo (gai_result);
|
|
}
|
|
|
|
static bool
|
|
irc_setup_listen_fds (struct server_context *ctx, struct error **e)
|
|
{
|
|
const char *bind_host = str_map_find (&ctx->config, "bind_host");
|
|
const char *bind_port = str_map_find (&ctx->config, "bind_port");
|
|
hard_assert (bind_port != NULL); // We have a default value for this
|
|
|
|
struct addrinfo gai_hints;
|
|
memset (&gai_hints, 0, sizeof gai_hints);
|
|
|
|
gai_hints.ai_socktype = SOCK_STREAM;
|
|
gai_hints.ai_flags = AI_PASSIVE;
|
|
|
|
struct strv ports = strv_make ();
|
|
cstr_split (bind_port, ",", true, &ports);
|
|
|
|
// For C and simplicity's sake let's assume that the host will resolve
|
|
// to at most two different addresses: IPv4 and IPv6 in case it is NULL
|
|
ctx->listen_alloc = ports.len * 2;
|
|
|
|
ctx->listen_fds =
|
|
xcalloc (ctx->listen_alloc, sizeof *ctx->listen_fds);
|
|
ctx->listen_events =
|
|
xcalloc (ctx->listen_alloc, sizeof *ctx->listen_events);
|
|
for (size_t i = 0; i < ports.len; i++)
|
|
irc_listen_resolve (ctx, bind_host, ports.vector[i], &gai_hints);
|
|
strv_free (&ports);
|
|
|
|
if (!ctx->listen_len)
|
|
{
|
|
error_set (e, "%s: %s",
|
|
"network setup failed", "no ports to listen on");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// --- Main --------------------------------------------------------------------
|
|
|
|
static void
|
|
on_signal_pipe_readable (const struct pollfd *fd, struct server_context *ctx)
|
|
{
|
|
char dummy;
|
|
(void) read (fd->fd, &dummy, 1);
|
|
|
|
if (g_termination_requested && !ctx->quitting)
|
|
irc_initiate_quit (ctx);
|
|
}
|
|
|
|
static void
|
|
daemonize (struct server_context *ctx)
|
|
{
|
|
print_status ("daemonizing...");
|
|
|
|
if (chdir ("/"))
|
|
exit_fatal ("%s: %s", "chdir", strerror (errno));
|
|
|
|
// Because of systemd, we need to exit the parent process _after_ writing
|
|
// a PID file, otherwise our grandchild would receive a SIGTERM
|
|
int sync_pipe[2];
|
|
if (pipe (sync_pipe))
|
|
exit_fatal ("%s: %s", "pipe", strerror (errno));
|
|
|
|
pid_t pid;
|
|
if ((pid = fork ()) < 0)
|
|
exit_fatal ("%s: %s", "fork", strerror (errno));
|
|
else if (pid)
|
|
{
|
|
// Wait until all write ends of the pipe are closed, which can mean
|
|
// either success or failure, we don't need to care
|
|
xclose (sync_pipe[PIPE_WRITE]);
|
|
|
|
char dummy;
|
|
if (read (sync_pipe[PIPE_READ], &dummy, 1) < 0)
|
|
exit_fatal ("%s: %s", "read", strerror (errno));
|
|
|
|
exit (EXIT_SUCCESS);
|
|
}
|
|
|
|
setsid ();
|
|
signal (SIGHUP, SIG_IGN);
|
|
|
|
if ((pid = fork ()) < 0)
|
|
exit_fatal ("%s: %s", "fork", strerror (errno));
|
|
else if (pid)
|
|
exit (EXIT_SUCCESS);
|
|
|
|
openlog (PROGRAM_NAME, LOG_NDELAY | LOG_NOWAIT | LOG_PID, 0);
|
|
g_log_message_real = log_message_syslog;
|
|
|
|
// Write the PID file (if so configured) and get rid of the pipe, so that
|
|
// the read() in our grandparent finally returns zero (no write ends)
|
|
struct error *e = NULL;
|
|
if (!irc_lock_pid_file (ctx, &e))
|
|
exit_fatal ("%s", e->message);
|
|
|
|
xclose (sync_pipe[PIPE_READ]);
|
|
xclose (sync_pipe[PIPE_WRITE]);
|
|
|
|
// XXX: we may close our own descriptors this way, crippling ourselves;
|
|
// there is no real guarantee that we will start with all three
|
|
// descriptors open. In theory we could try to enumerate the descriptors
|
|
// at the start of main().
|
|
for (int i = 0; i < 3; i++)
|
|
xclose (i);
|
|
|
|
int tty = open ("/dev/null", O_RDWR);
|
|
if (tty != 0 || dup (0) != 1 || dup (0) != 2)
|
|
exit_fatal ("failed to reopen FD's: %s", strerror (errno));
|
|
|
|
poller_post_fork (&ctx->poller);
|
|
}
|
|
|
|
int
|
|
main (int argc, char *argv[])
|
|
{
|
|
// Need to call this first as all string maps depend on it
|
|
siphash_wrapper_randomize ();
|
|
|
|
static const struct opt opts[] =
|
|
{
|
|
{ 'd', "debug", NULL, 0, "run in debug mode (do not daemonize)" },
|
|
{ '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_make (argc, argv, opts, NULL, "IRC daemon.");
|
|
|
|
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_simple_config_write_default (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");
|
|
setup_signal_handlers ();
|
|
init_openssl ();
|
|
|
|
struct server_context ctx;
|
|
server_context_init (&ctx);
|
|
ctx.started = time (NULL);
|
|
irc_register_handlers (&ctx);
|
|
irc_register_cap_handlers (&ctx);
|
|
|
|
struct error *e = NULL;
|
|
if (!simple_config_update_from_file (&ctx.config, &e))
|
|
{
|
|
print_error ("error loading configuration: %s", e->message);
|
|
error_free (e);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
ctx.signal_event = poller_fd_make (&ctx.poller, g_signal_pipe[0]);
|
|
ctx.signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable;
|
|
ctx.signal_event.user_data = &ctx;
|
|
poller_fd_set (&ctx.signal_event, POLLIN);
|
|
|
|
if (!irc_initialize_tls (&ctx, &e)
|
|
|| !irc_initialize_server_name (&ctx, &e)
|
|
|| !irc_initialize_motd (&ctx, &e)
|
|
|| !irc_initialize_catalog (&ctx, &e)
|
|
|| !irc_parse_config (&ctx, &e)
|
|
|| !irc_setup_listen_fds (&ctx, &e))
|
|
exit_fatal ("%s", e->message);
|
|
|
|
if (!g_debug_mode)
|
|
daemonize (&ctx);
|
|
else if (!irc_lock_pid_file (&ctx, &e))
|
|
exit_fatal ("%s", e->message);
|
|
|
|
#if OpenBSD >= 201605
|
|
// This won't be as simple once we decide to implement REHASH
|
|
if (pledge ("stdio inet dns", NULL))
|
|
exit_fatal ("%s: %s", "pledge", strerror (errno));
|
|
#endif
|
|
|
|
ctx.polling = true;
|
|
while (ctx.polling)
|
|
poller_run (&ctx.poller);
|
|
|
|
server_context_free (&ctx);
|
|
return EXIT_SUCCESS;
|
|
}
|