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Diffstat (limited to 'src/kike.c')
| -rw-r--r-- | src/kike.c | 3251 |
1 files changed, 0 insertions, 3251 deletions
diff --git a/src/kike.c b/src/kike.c deleted file mode 100644 index f3c4f17..0000000 --- a/src/kike.c +++ /dev/null @@ -1,3251 +0,0 @@ -/* - * kike.c: the experimental IRC daemon - * - * Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com> - * All rights reserved. - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION - * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN - * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - * - */ - -#define PROGRAM_NAME "kike" -#define PROGRAM_VERSION "alpha" - -#include "common.c" -#include <nl_types.h> - -// --- Configuration (application-specific) ------------------------------------ - -static struct config_item g_config_table[] = -{ - { "server_name", NULL, "Server name" }, - { "server_info", "My server", "Brief server description" }, - { "motd", NULL, "MOTD filename" }, - { "catalog", NULL, "catgets localization catalog" }, - - { "bind_host", NULL, "Address of the IRC server" }, - { "bind_port", "6667", "Port of the IRC server" }, - { "ssl_cert", NULL, "Server SSL certificate (PEM)" }, - { "ssl_key", NULL, "Server SSL private key (PEM)" }, - - { "operators", NULL, "IRCop SSL cert. fingerprints" }, - - { "max_connections", "0", "Global connection limit" }, - { "ping_interval", "180", "Interval between PING's (sec)" }, - { NULL, NULL, NULL } -}; - -// --- Signals ----------------------------------------------------------------- - -static int g_signal_pipe[2]; ///< A pipe used to signal... signals - -/// Program termination has been requested by a signal -static volatile sig_atomic_t g_termination_requested; - -static void -sigterm_handler (int signum) -{ - (void) signum; - - g_termination_requested = true; - - int original_errno = errno; - if (write (g_signal_pipe[1], "t", 1) == -1) - soft_assert (errno == EAGAIN); - errno = original_errno; -} - -static void -setup_signal_handlers (void) -{ - if (pipe (g_signal_pipe) == -1) - exit_fatal ("%s: %s", "pipe", strerror (errno)); - - set_cloexec (g_signal_pipe[0]); - set_cloexec (g_signal_pipe[1]); - - // So that the pipe cannot overflow; it would make write() block within - // the signal handler, which is something we really don't want to happen. - // The same holds true for read(). - set_blocking (g_signal_pipe[0], false); - set_blocking (g_signal_pipe[1], false); - - signal (SIGPIPE, SIG_IGN); - - struct sigaction sa; - sa.sa_flags = SA_RESTART; - sigemptyset (&sa.sa_mask); - sa.sa_handler = sigterm_handler; - if (sigaction (SIGINT, &sa, NULL) == -1 - || sigaction (SIGTERM, &sa, NULL) == -1) - exit_fatal ("%s: %s", "sigaction", strerror (errno)); -} - -// --- IRC token validation ---------------------------------------------------- - -// Use the enum only if applicable and a simple boolean isn't sufficient. - -enum validation_result -{ - VALIDATION_OK, - VALIDATION_ERROR_EMPTY, - VALIDATION_ERROR_TOO_LONG, - VALIDATION_ERROR_INVALID -}; - -// Everything as per RFC 2812 -#define IRC_MAX_NICKNAME 9 -#define IRC_MAX_HOSTNAME 63 -#define IRC_MAX_CHANNEL_NAME 50 -#define IRC_MAX_MESSAGE_LENGTH 510 - -static bool -irc_regex_match (const char *regex, const char *s) -{ - static struct str_map cache; - static bool initialized; - - if (!initialized) - { - regex_cache_init (&cache); - initialized = true; - } - - struct error *e = NULL; - bool result = regex_cache_match (&cache, regex, - REG_EXTENDED | REG_NOSUB, s, &e); - hard_assert (!e); - return result; -} - -static const char * -irc_validate_to_str (enum validation_result result) -{ - switch (result) - { - case VALIDATION_OK: return "success"; - case VALIDATION_ERROR_EMPTY: return "the value is empty"; - case VALIDATION_ERROR_INVALID: return "invalid format"; - case VALIDATION_ERROR_TOO_LONG: return "the value is too long"; - default: abort (); - } -} - -// Anything to keep it as short as possible -#define SN "[0-9A-Za-z][-0-9A-Za-z]*[0-9A-Za-z]*" -#define N4 "[0-9]{1,3}" -#define N6 "[0-9ABCDEFabcdef]{1,}" - -#define LE "A-Za-z" -#define SP "][\\\\`_^{|}" - -static enum validation_result -irc_validate_hostname (const char *hostname) -{ - if (!*hostname) - return VALIDATION_ERROR_EMPTY; - if (!irc_regex_match ("^" SN "(\\." SN ")*$", hostname)) - return VALIDATION_ERROR_INVALID; - if (strlen (hostname) > IRC_MAX_HOSTNAME) - return VALIDATION_ERROR_TOO_LONG; - return VALIDATION_OK; -} - -static bool -irc_is_valid_hostaddr (const char *hostaddr) -{ - if (irc_regex_match ("^" N4 "\\." N4 "\\." N4 "\\." N4 "$", hostaddr) - || irc_regex_match ("^" N6 ":" N6 ":" N6 ":" N6 ":" - N6 ":" N6 ":" N6 ":" N6 "$", hostaddr) - || irc_regex_match ("^0:0:0:0:0:(0|[Ff]{4}):" - N4 "\\." N4 "\\." N4 "\\." N4 "$", hostaddr)) - return true; - return false; -} - -static bool -irc_is_valid_host (const char *host) -{ - return irc_validate_hostname (host) == VALIDATION_OK - || irc_is_valid_hostaddr (host); -} - -static bool -irc_is_valid_user (const char *user) -{ - return irc_regex_match ("^[^\r\n @]+$", user); -} - -static bool -irc_validate_nickname (const char *nickname) -{ - if (!*nickname) - return VALIDATION_ERROR_EMPTY; - if (!irc_regex_match ("^[" SP LE "][" SP LE "0-9-]*$", nickname)) - return VALIDATION_ERROR_INVALID; - if (strlen (nickname) > IRC_MAX_NICKNAME) - return VALIDATION_ERROR_TOO_LONG; - return VALIDATION_OK; -} - -static enum validation_result -irc_validate_channel_name (const char *channel_name) -{ - if (!*channel_name) - return VALIDATION_ERROR_EMPTY; - if (*channel_name != '#' || strpbrk (channel_name, "\7\r\n ,:")) - return VALIDATION_ERROR_INVALID; - if (strlen (channel_name) > IRC_MAX_CHANNEL_NAME) - return VALIDATION_ERROR_TOO_LONG; - return VALIDATION_OK; -} - -static bool -irc_is_valid_key (const char *key) -{ - // XXX: should be 7-bit as well but whatever - return irc_regex_match ("^[^\r\n\f\t\v ]{1,23}$", key); -} - -#undef SN -#undef N4 -#undef N6 - -#undef LE -#undef SP - -static bool -irc_is_valid_user_mask (const char *mask) -{ - return irc_regex_match ("^[^!@]+![^!@]+@[^@!]+$", mask); -} - -static bool -irc_is_valid_fingerprint (const char *fp) -{ - return irc_regex_match ("^[a-fA-F0-9]{2}(:[a-fA-F0-9]{2}){19}$", fp); -} - -// --- Clients (equals users) -------------------------------------------------- - -#define IRC_SUPPORTED_USER_MODES "aiwros" - -enum -{ - IRC_USER_MODE_INVISIBLE = (1 << 0), - IRC_USER_MODE_RX_WALLOPS = (1 << 1), - IRC_USER_MODE_RESTRICTED = (1 << 2), - IRC_USER_MODE_OPERATOR = (1 << 3), - IRC_USER_MODE_RX_SERVER_NOTICES = (1 << 4) -}; - -struct client -{ - LIST_HEADER (client) - struct server_context *ctx; ///< Server context - - int socket_fd; ///< The TCP socket - struct str read_buffer; ///< Unprocessed input - struct str write_buffer; ///< Output yet to be sent out - - bool initialized; ///< Has any data been received yet? - bool registered; ///< The user has registered - bool closing_link; ///< Closing link - - bool ssl_rx_want_tx; ///< SSL_read() wants to write - bool ssl_tx_want_rx; ///< SSL_write() wants to read - SSL *ssl; ///< SSL connection - char *ssl_cert_fingerprint; ///< Client certificate fingerprint - - char *nickname; ///< IRC nickname (main identifier) - char *username; ///< IRC username - char *realname; ///< IRC realname (e-mail) - - char *hostname; ///< Hostname shown to the network - - unsigned mode; ///< User's mode - char *away_message; ///< Away message - time_t last_active; ///< Last PRIVMSG, to get idle time -}; - -static void -client_init (struct client *self) -{ - memset (self, 0, sizeof *self); - - self->socket_fd = -1; - str_init (&self->read_buffer); - str_init (&self->write_buffer); -} - -static void -client_free (struct client *self) -{ - if (!soft_assert (self->socket_fd == -1)) - xclose (self->socket_fd); - if (self->ssl) - SSL_free (self->ssl); - - str_free (&self->read_buffer); - str_free (&self->write_buffer); - - free (self->nickname); - free (self->username); - free (self->realname); - - free (self->hostname); - free (self->away_message); -} - -static void client_close_link (struct client *, const char *); -static void client_send (struct client *, const char *, ...) - ATTRIBUTE_PRINTF (2, 3); -static void client_cancel_timers (struct client *); -static void client_set_kill_timer (struct client *); -static void client_update_poller (struct client *, const struct pollfd *); - -// --- Channels ---------------------------------------------------------------- - -#define IRC_SUPPORTED_CHAN_MODES "ov" "beI" "imnqpst" "kl" - -enum -{ - IRC_CHAN_MODE_INVITE_ONLY = (1 << 0), - IRC_CHAN_MODE_MODERATED = (1 << 1), - IRC_CHAN_MODE_NO_OUTSIDE_MSGS = (1 << 2), - IRC_CHAN_MODE_QUIET = (1 << 3), - IRC_CHAN_MODE_PRIVATE = (1 << 4), - IRC_CHAN_MODE_SECRET = (1 << 5), - IRC_CHAN_MODE_PROTECTED_TOPIC = (1 << 6), - - IRC_CHAN_MODE_OPERATOR = (1 << 7), - IRC_CHAN_MODE_VOICE = (1 << 8) -}; - -struct channel_user -{ - LIST_HEADER (channel_user) - - unsigned modes; - struct client *c; -}; - -struct channel -{ - struct server_context *ctx; ///< Server context - - char *name; ///< Channel name - unsigned modes; ///< Channel modes - char *key; ///< Channel key - long user_limit; ///< User limit or -1 - - char *topic; ///< Channel topic - - struct channel_user *users; ///< Channel users - - struct str_vector ban_list; ///< Ban list - struct str_vector exception_list; ///< Exceptions from bans - struct str_vector invite_list; ///< Exceptions from +I -}; - -static struct channel * -channel_new (void) -{ - struct channel *self = xcalloc (1, sizeof *self); - - self->user_limit = -1; - self->topic = xstrdup (""); - - str_vector_init (&self->ban_list); - str_vector_init (&self->exception_list); - str_vector_init (&self->invite_list); - return self; -} - -static void -channel_delete (struct channel *self) -{ - free (self->name); - free (self->key); - free (self->topic); - - struct channel_user *link, *tmp; - for (link = self->users; link; link = tmp) - { - tmp = link->next; - free (link); - } - - str_vector_free (&self->ban_list); - str_vector_free (&self->exception_list); - str_vector_free (&self->invite_list); - - free (self); -} - -static char * -channel_get_mode (struct channel *self, bool disclose_secrets) -{ - struct str mode; - str_init (&mode); - - unsigned m = self->modes; - if (m & IRC_CHAN_MODE_INVITE_ONLY) str_append_c (&mode, 'i'); - if (m & IRC_CHAN_MODE_MODERATED) str_append_c (&mode, 'm'); - if (m & IRC_CHAN_MODE_NO_OUTSIDE_MSGS) str_append_c (&mode, 'n'); - 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 server_context -{ - int listen_fds[1]; ///< Listening socket FD's - size_t n_listen_fds; ///< Number of listening sockets - - struct client *clients; ///< Clients - SSL_CTX *ssl_ctx; ///< SSL context - 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 poller poller; ///< Manages polled description - bool quitting; ///< User requested quitting - bool polling; ///< The event loop is running - - 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 str_vector motd; ///< MOTD (none if empty) - nl_catd catalog; ///< Message catalog for server msgs - struct str_map operators; ///< SSL cert. fingerprints for IRCops -}; - -static void -server_context_init (struct server_context *self) -{ - self->n_listen_fds = 0; - self->clients = NULL; - self->n_clients = 0; - - str_map_init (&self->users); - self->users.key_xfrm = irc_strxfrm; - str_map_init (&self->channels); - self->channels.key_xfrm = irc_strxfrm; - self->channels.free = (void (*) (void *)) channel_delete; - str_map_init (&self->handlers); - self->handlers.key_xfrm = irc_strxfrm; - - poller_init (&self->poller); - self->quitting = false; - self->polling = false; - - str_map_init (&self->config); - self->config.free = free; - load_config_defaults (&self->config, g_config_table); - - self->server_name = NULL; - self->ping_interval = 0; - self->max_connections = 0; - str_vector_init (&self->motd); - self->catalog = (nl_catd) -1; - str_map_init (&self->operators); - // 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->n_listen_fds; i++) - xclose (self->listen_fds[i]); - if (self->ssl_ctx) - SSL_CTX_free (self->ssl_ctx); - - struct client *link, *tmp; - for (link = self->clients; link; link = tmp) - { - tmp = link->next; - client_free (link); - free (link); - } - - free (self->server_name); - str_map_free (&self->users); - str_map_free (&self->channels); - str_map_free (&self->handlers); - poller_free (&self->poller); - - str_vector_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) - ctx->polling = false; -} - -static void -irc_initiate_quit (struct server_context *ctx) -{ - print_status ("shutting down"); - - for (struct client *iter = ctx->clients; iter; iter = iter->next) - if (!iter->closing_link) - client_close_link (iter, "Shutting down"); - - for (size_t i = 0; i < ctx->n_listen_fds; i++) - { - ssize_t index = poller_find_by_fd (&ctx->poller, ctx->listen_fds[i]); - if (soft_assert (index != -1)) - poller_remove_at_index (&ctx->poller, index); - xclose (ctx->listen_fds[i]); - } - ctx->n_listen_fds = 0; - - ctx->quitting = true; - 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); - 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_init (&targets); - targets.key_xfrm = irc_strxfrm; - - struct str_map_iter iter; - str_map_iter_init (&iter, &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; - - // When we're unregistering, the str_map_find() will return zero, - // which will prevent sending the QUIT message to ourselves. - for (struct channel_user *iter = chan->users; iter; iter = iter->next) - str_map_set (&targets, iter->c->nickname, - str_map_find (&c->ctx->users, iter->c->nickname)); - } - - str_map_iter_init (&iter, &targets); - struct client *target; - while ((target = str_map_iter_next (&iter))) - client_send (target, "%s", message); -} - -// --- 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_init (&mode); - 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->initialized && !c->closing_link); - - // TODO: kill the connection above some "SendQ" threshold (careful!) - str_append_data (&c->write_buffer, s->str, - s->len > IRC_MAX_MESSAGE_LENGTH ? IRC_MAX_MESSAGE_LENGTH : s->len); - 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); -} - -static void -client_send (struct client *c, const char *format, ...) -{ - struct str tmp; - str_init (&tmp); - - 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_unregister (struct client *c, const char *reason) -{ - if (!c->registered) - return; - - // Make the user effectively non-existent - str_map_set (&c->ctx->users, c->nickname, NULL); - - 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_iter iter; - str_map_iter_init (&iter, &c->ctx->channels); - struct channel *chan, *next = str_map_iter_next (&iter); - for (chan = next; chan; chan = next) - { - next = str_map_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); - } - - free (c->nickname); - c->nickname = NULL; - c->registered = false; -} - -static void -client_kill (struct client *c, const char *reason) -{ - client_unregister (c, reason ? reason : "Client exited"); - - struct server_context *ctx = c->ctx; - ssize_t i = poller_find_by_fd (&ctx->poller, c->socket_fd); - if (i != -1) - poller_remove_at_index (&ctx->poller, i); - client_cancel_timers (c); - - if (c->ssl) - (void) SSL_shutdown (c->ssl); - xclose (c->socket_fd); - c->socket_fd = -1; - client_free (c); - LIST_UNLINK (ctx->clients, c); - ctx->n_clients--; - free (c); - - irc_try_finish_quit (ctx); -} - -static void -client_close_link (struct client *c, const char *reason) -{ - 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->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 str_vector *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_init (&fingerprint); - str_append_printf (&fingerprint, "%02X", hash[0]); - for (size_t i = 1; i < sizeof hash; i++) - str_append_printf (&fingerprint, ":%02X", hash[i]); - return str_steal (&fingerprint); -} - -// --- Timers ------------------------------------------------------------------ - -static void -client_cancel_timers (struct client *c) -{ - ssize_t i; - struct poller_timers *timers = &c->ctx->poller.timers; - while ((i = poller_timers_find_by_data (timers, c)) != -1) - poller_timers_remove_at_index (timers, i); -} - -static void -client_set_timer (struct client *c, poller_timer_func fn, unsigned interval) -{ - client_cancel_timers (c); - poller_timers_add (&c->ctx->poller.timers, fn, c, interval * 1000); -} - -static void -on_client_kill_timer (void *user_data) -{ - struct client *c = user_data; - hard_assert (!c->initialized || c->closing_link); - client_kill (c, NULL); -} - -static void -client_set_kill_timer (struct client *c) -{ - client_set_timer (c, on_client_kill_timer, c->ctx->ping_interval); -} - -static void -on_client_timeout_timer (void *user_data) -{ - struct client *c = user_data; - 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 (void *user_data) -{ - struct client *c = user_data; - hard_assert (!c->closing_link); - client_send (c, "PING :%s", c->ctx->server_name); - client_set_timer (c, on_client_timeout_timer, c->ctx->ping_interval); -} - -static void -client_set_ping_timer (struct client *c) -{ - client_set_timer (c, on_client_ping_timer, c->ctx->ping_interval); -} - -// --- IRC command handling ---------------------------------------------------- - -enum -{ - IRC_RPL_WELCOME = 1, - IRC_RPL_YOURHOST = 2, - IRC_RPL_CREATED = 3, - IRC_RPL_MYINFO = 4, - - IRC_RPL_UMODEIS = 221, - IRC_RPL_LUSERCLIENT = 251, - IRC_RPL_LUSEROP = 252, - IRC_RPL_LUSERUNKNOWN = 253, - IRC_RPL_LUSERCHANNELS = 254, - IRC_RPL_LUSERME = 255, - - IRC_RPL_AWAY = 301, - IRC_RPL_USERHOST = 302, - IRC_RPL_ISON = 303, - IRC_RPL_UNAWAY = 305, - IRC_RPL_NOWAWAY = 306, - IRC_RPL_WHOISUSER = 311, - IRC_RPL_WHOISSERVER = 312, - IRC_RPL_WHOISOPERATOR = 313, - IRC_RPL_ENDOFWHO = 315, - IRC_RPL_WHOISIDLE = 317, - IRC_RPL_ENDOFWHOIS = 318, - IRC_RPL_WHOISCHANNELS = 319, - IRC_RPL_LIST = 322, - IRC_RPL_LISTEND = 323, - IRC_RPL_CHANNELMODEIS = 324, - IRC_RPL_NOTOPIC = 331, - IRC_RPL_TOPIC = 332, - IRC_RPL_INVITELIST = 346, - IRC_RPL_ENDOFINVITELIST = 347, - IRC_RPL_EXCEPTLIST = 348, - IRC_RPL_ENDOFEXCEPTLIST = 349, - IRC_RPL_VERSION = 351, - IRC_RPL_WHOREPLY = 352, - IRC_RPL_NAMREPLY = 353, - IRC_RPL_ENDOFNAMES = 366, - IRC_RPL_BANLIST = 367, - IRC_RPL_ENDOFBANLIST = 368, - IRC_RPL_MOTD = 372, - IRC_RPL_MOTDSTART = 375, - IRC_RPL_ENDOFMOTD = 376, - IRC_RPL_TIME = 391, - - IRC_ERR_NOSUCHNICK = 401, - IRC_ERR_NOSUCHSERVER = 402, - IRC_ERR_NOSUCHCHANNEL = 403, - IRC_ERR_CANNOTSENDTOCHAN = 404, - IRC_ERR_NOORIGIN = 409, - IRC_ERR_NORECIPIENT = 411, - IRC_ERR_NOTEXTTOSEND = 412, - IRC_ERR_UNKNOWNCOMMAND = 421, - IRC_ERR_NOMOTD = 422, - IRC_ERR_NOADMININFO = 423, - IRC_ERR_NONICKNAMEGIVEN = 431, - IRC_ERR_ERRONEOUSNICKNAME = 432, - IRC_ERR_NICKNAMEINUSE = 433, - IRC_ERR_USERNOTINCHANNEL = 441, - IRC_ERR_NOTONCHANNEL = 442, - IRC_ERR_SUMMONDISABLED = 445, - IRC_ERR_USERSDISABLED = 446, - IRC_ERR_NOTREGISTERED = 451, - IRC_ERR_NEEDMOREPARAMS = 461, - IRC_ERR_ALREADYREGISTERED = 462, - IRC_ERR_KEYSET = 467, - IRC_ERR_CHANNELISFULL = 471, - IRC_ERR_UNKNOWNMODE = 472, - IRC_ERR_INVITEONLYCHAN = 473, - IRC_ERR_BANNEDFROMCHAN = 474, - IRC_ERR_BADCHANNELKEY = 475, - IRC_ERR_BADCHANMASK = 476, - IRC_ERR_NOPRIVILEGES = 481, - IRC_ERR_CHANOPRIVSNEEDED = 482, - - IRC_ERR_UMODEUNKNOWNFLAG = 501, - IRC_ERR_USERSDONTMATCH = 502 -}; - -static const char *g_default_replies[] = -{ - [IRC_RPL_WELCOME] = ":Welcome to the Internet Relay Network %s!%s@%s", - [IRC_RPL_YOURHOST] = ":Your host is %s, running version %s", - [IRC_RPL_CREATED] = ":This server was created %s", - [IRC_RPL_MYINFO] = "%s %s %s %s", - - [IRC_RPL_UMODEIS] = "+%s", - [IRC_RPL_LUSERCLIENT] = ":There are %d users and %d services on %d servers", - [IRC_RPL_LUSEROP] = "%d :operator(s) online", - [IRC_RPL_LUSERUNKNOWN] = "%d :unknown connection(s)", - [IRC_RPL_LUSERCHANNELS] = "%d :channels formed", - [IRC_RPL_LUSERME] = ":I have %d clients and %d servers", - - [IRC_RPL_AWAY] = "%s :%s", - [IRC_RPL_USERHOST] = ":%s", - [IRC_RPL_ISON] = ":%s", - [IRC_RPL_UNAWAY] = ":You are no longer marked as being away", - [IRC_RPL_NOWAWAY] = ":You have been marked as being away", - [IRC_RPL_WHOISUSER] = "%s %s %s * :%s", - [IRC_RPL_WHOISSERVER] = "%s %s :%s", - [IRC_RPL_WHOISOPERATOR] = "%s :is an IRC operator", - [IRC_RPL_ENDOFWHO] = "%s :End of WHO list", - [IRC_RPL_WHOISIDLE] = "%s %d :seconds idle", - [IRC_RPL_ENDOFWHOIS] = "%s :End of WHOIS list", - [IRC_RPL_WHOISCHANNELS] = "%s :%s", - [IRC_RPL_LIST] = "%s %d :%s", - [IRC_RPL_LISTEND] = ":End of LIST", - [IRC_RPL_CHANNELMODEIS] = "%s +%s", - [IRC_RPL_NOTOPIC] = "%s :No topic is set", - [IRC_RPL_TOPIC] = "%s :%s", - [IRC_RPL_INVITELIST] = "%s %s", - [IRC_RPL_ENDOFINVITELIST] = "%s :End of channel invite list", - [IRC_RPL_EXCEPTLIST] = "%s %s", - [IRC_RPL_ENDOFEXCEPTLIST] = "%s :End of channel exception list", - [IRC_RPL_VERSION] = "%s.%d %s :%s", - [IRC_RPL_WHOREPLY] = "%s %s %s %s %s %s :%d %s", - [IRC_RPL_NAMREPLY] = "%c %s :%s", - [IRC_RPL_ENDOFNAMES] = "%s :End of NAMES list", - [IRC_RPL_BANLIST] = "%s %s", - [IRC_RPL_ENDOFBANLIST] = "%s :End of channel ban list", - [IRC_RPL_MOTD] = ":- %s", - [IRC_RPL_MOTDSTART] = ":- %s Message of the day - ", - [IRC_RPL_ENDOFMOTD] = ":End of MOTD command", - [IRC_RPL_TIME] = "%s :%s", - - [IRC_ERR_NOSUCHNICK] = "%s :No such nick/channel", - [IRC_ERR_NOSUCHSERVER] = "%s :No such server", - [IRC_ERR_NOSUCHCHANNEL] = "%s :No such channel", - [IRC_ERR_CANNOTSENDTOCHAN] = "%s :Cannot send to channel", - [IRC_ERR_NOORIGIN] = ":No origin specified", - [IRC_ERR_NORECIPIENT] = ":No recipient given (%s)", - [IRC_ERR_NOTEXTTOSEND] = ":No text to send", - [IRC_ERR_UNKNOWNCOMMAND] = "%s: Unknown command", - [IRC_ERR_NOMOTD] = ":MOTD File is missing", - [IRC_ERR_NOADMININFO] = "%s :No administrative info available", - [IRC_ERR_NONICKNAMEGIVEN] = ":No nickname given", - [IRC_ERR_ERRONEOUSNICKNAME] = "%s :Erroneous nickname", - [IRC_ERR_NICKNAMEINUSE] = "%s :Nickname is already in use", - [IRC_ERR_USERNOTINCHANNEL] = "%s %s :They aren't on that channel", - [IRC_ERR_NOTONCHANNEL] = "%s :You're not on that channel", - [IRC_ERR_SUMMONDISABLED] = ":SUMMON has been disabled", - [IRC_ERR_USERSDISABLED] = ":USERS has been disabled", - [IRC_ERR_NOTREGISTERED] = ":You have not registered", - [IRC_ERR_NEEDMOREPARAMS] = "%s :Not enough parameters", - [IRC_ERR_ALREADYREGISTERED] = ":Unauthorized command (already registered)", - [IRC_ERR_KEYSET] = "%s :Channel key already set", - [IRC_ERR_CHANNELISFULL] = "%s :Cannot join channel (+l)", - [IRC_ERR_UNKNOWNMODE] = "%c :is unknown mode char to me for %s", - [IRC_ERR_INVITEONLYCHAN] = "%s :Cannot join channel (+i)", - [IRC_ERR_BANNEDFROMCHAN] = "%s :Cannot join channel (+b)", - [IRC_ERR_BADCHANNELKEY] = "%s :Cannot join channel (+k)", - [IRC_ERR_BADCHANMASK] = "%s :Bad Channel Mask", - [IRC_ERR_NOPRIVILEGES] = ":Permission Denied- You're not an IRC operator", - [IRC_ERR_CHANOPRIVSNEEDED] = "%s :You're not channel operator", - - [IRC_ERR_UMODEUNKNOWNFLAG] = ":Unknown MODE flag", - [IRC_ERR_USERSDONTMATCH] = ":Cannot change mode for other users", -}; - -// 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 tmp; - str_init (&tmp); - - va_list ap; - va_start (ap, id); - str_append_printf (&tmp, ":%s %03d %s ", - c->ctx->server_name, id, c->nickname ? c->nickname : ""); - str_append_vprintf (&tmp, - irc_get_text (c->ctx, id, g_default_replies[id]), ap); - va_end (ap); - - client_send_str (c, &tmp); - str_free (&tmp); -} - -#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_init (&iter, &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_try_finish_registration (struct client *c) -{ - struct server_context *ctx = c->ctx; - if (!c->nickname || !c->username || !c->realname) - 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_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 SSL client certificate fingerprint is %s", - ctx->server_name, c->nickname, c->ssl_cert_fingerprint); -} - -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 SSL 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); - - if (c->registered) - { - char *message = xstrdup_printf (":%s!%s@%s NICK :%s", - c->nickname, c->username, c->hostname, nickname); - irc_send_to_roommates (c, message); - free (message); - } - - // Release the old nickname and allocate a new one - if (c->nickname) - { - str_map_set (&ctx->users, c->nickname, NULL); - free (c->nickname); - } - c->nickname = xstrdup (nickname); - str_map_set (&ctx->users, nickname, c); - - if (!c->registered) - 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"; - - free (c->username); - c->username = xstrdup (username); - free (c->realname); - c->realname = xstrdup (realname); - - 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_init (&reply); - 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])) - irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]); - else - irc_send_reply (c, IRC_RPL_VERSION, PROGRAM_VERSION, g_debug_mode, - c->ctx->server_name, PROGRAM_NAME " " PROGRAM_VERSION); -} - -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_init (&diff); - - 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 SSL" - " 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 str_vector *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); -} - -static char * -irc_check_expand_user_mask (const char *mask) -{ - struct str result; - str_init (&result); - 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); -} - -static void -irc_handle_chan_mode_change (struct client *c, - struct channel *chan, char *params[]) -{ - struct channel_user *user = channel_get_user (chan, c); - - // 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 str added; struct str_vector added_params; - struct str removed; struct str_vector removed_params; - - str_init (&added); str_vector_init (&added_params); - str_init (&removed); str_vector_init (&removed_params); - -// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // TODO: try to convert this madness into functions; that will most - // likely require creating a special parser class -#define NEEDS_OPER \ - if (!user || (!(user->modes & IRC_CHAN_MODE_OPERATOR) \ - && !(c->mode & IRC_USER_MODE_OPERATOR))) \ - { \ - irc_send_reply (c, IRC_ERR_CHANOPRIVSNEEDED, chan->name); \ - continue; \ - } - -#define HANDLE_USER(mode) \ - if (!(target = *params)) \ - continue; \ - params++; \ - NEEDS_OPER \ - if (!(client = str_map_find (&c->ctx->users, target))) \ - irc_send_reply (c, IRC_ERR_NOSUCHNICK, target); \ - else if (!(target_user = channel_get_user (chan, client))) \ - irc_send_reply (c, IRC_ERR_USERNOTINCHANNEL, \ - target, chan->name); \ - else if (irc_modify_mode (&target_user->modes, (mode), adding)) \ - { \ - str_append_c (output, mode_char); \ - str_vector_add (output_params, client->nickname); \ - } - -#define HANDLE_LIST(list, list_msg, end_msg) \ -{ \ - if (!(target = *params)) \ - { \ - if (adding) \ - irc_send_channel_list (c, chan->name, list, list_msg, end_msg); \ - continue; \ - } \ - params++; \ - NEEDS_OPER \ - char *mask = irc_check_expand_user_mask (target); \ - if (!mask) \ - continue; \ - size_t i; \ - for (i = 0; i < (list)->len; i++) \ - if (!irc_strcmp ((list)->vector[i], mask)) \ - break; \ - if (!((i != (list)->len) ^ adding)) \ - { \ - free (mask); \ - continue; \ - } \ - if (adding) \ - str_vector_add ((list), mask); \ - else \ - str_vector_remove ((list), i); \ - str_append_c (output, mode_char); \ - str_vector_add (output_params, mask); \ - free (mask); \ -} - -#define HANDLE_MODE(mode) \ - NEEDS_OPER \ - if (irc_modify_mode (&chan->modes, (mode), adding)) \ - str_append_c (output, mode_char); - -#define REMOVE_MODE(removed_mode, removed_char) \ - if (adding && irc_modify_mode (&chan->modes, (removed_mode), false)) \ - str_append_c (&removed, (removed_char)); - -// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - const char *mode_string; - while ((mode_string = *params++)) - { - bool adding = true; - struct str *output = &added; - struct str_vector *output_params = &added_params; - - const char *target; - struct channel_user *target_user; - struct client *client; - - char mode_char; - while (*mode_string) - switch ((mode_char = *mode_string++)) - { - case '+': - adding = true; - output = &added; - output_params = &added_params; - break; - case '-': - adding = false; - output = &removed; - output_params = &removed_params; - break; - - case 'o': HANDLE_USER (IRC_CHAN_MODE_OPERATOR) break; - case 'v': HANDLE_USER (IRC_CHAN_MODE_VOICE) break; - - case 'i': HANDLE_MODE (IRC_CHAN_MODE_INVITE_ONLY) break; - case 'm': HANDLE_MODE (IRC_CHAN_MODE_MODERATED) break; - case 'n': HANDLE_MODE (IRC_CHAN_MODE_NO_OUTSIDE_MSGS) break; - case 'q': HANDLE_MODE (IRC_CHAN_MODE_QUIET) break; - case 't': HANDLE_MODE (IRC_CHAN_MODE_PROTECTED_TOPIC) break; - - case 'p': - HANDLE_MODE (IRC_CHAN_MODE_PRIVATE) - REMOVE_MODE (IRC_CHAN_MODE_SECRET, 's') - break; - case 's': - HANDLE_MODE (IRC_CHAN_MODE_SECRET) - REMOVE_MODE (IRC_CHAN_MODE_PRIVATE, 'p') - break; - - case 'b': - HANDLE_LIST (&chan->ban_list, - IRC_RPL_BANLIST, IRC_RPL_ENDOFBANLIST) - break; - case 'e': - HANDLE_LIST (&chan->exception_list, - IRC_RPL_EXCEPTLIST, IRC_RPL_ENDOFEXCEPTLIST) - break; - case 'I': - HANDLE_LIST (&chan->invite_list, - IRC_RPL_INVITELIST, IRC_RPL_ENDOFINVITELIST) - break; - - case 'k': - NEEDS_OPER - if (!adding) - { - if (!(target = *params)) - continue; - params++; - if (!chan->key || irc_strcmp (target, chan->key)) - continue; - - str_append_c (&removed, mode_char); - str_vector_add (&removed_params, chan->key); - free (chan->key); - chan->key = NULL; - } - else if (!(target = *params)) - continue; - else - { - params++; - if (chan->key) - irc_send_reply (c, IRC_ERR_KEYSET, chan->name); - else - { - chan->key = xstrdup (target); - str_append_c (&added, mode_char); - str_vector_add (&added_params, chan->key); - } - } - break; - case 'l': - NEEDS_OPER - if (!adding) - { - if (chan->user_limit == -1) - continue; - - chan->user_limit = -1; - str_append_c (&removed, mode_char); - } - else if (!(target = *params)) - continue; - else - { - params++; - unsigned long x; - if (xstrtoul (&x, target, 10) && x > 0 && x <= LONG_MAX) - { - chan->user_limit = x; - str_append_c (&added, mode_char); - str_vector_add (&added_params, target); - } - } - break; - - default: - RETURN_WITH_REPLY (c, IRC_ERR_UNKNOWNMODE); - } - } - -#undef NEEDS_OPER -#undef HANDLE_USER -#undef HANDLE_LIST -#undef HANDLE_MODE -#undef REMOVE_MODE - - if (added.len || removed.len) - { - struct str message; - str_init (&message); - str_append_printf (&message, ":%s!%s@%s MODE %s ", - c->nickname, c->username, c->hostname, chan->name); - if (added.len) - str_append_printf (&message, "+%s", added.str); - if (removed.len) - str_append_printf (&message, "-%s", removed.str); - for (size_t i = 0; i < added_params.len; i++) - str_append_printf (&message, " %s", added_params.vector[i]); - for (size_t i = 0; i < removed_params.len; i++) - str_append_printf (&message, " %s", removed_params.vector[i]); - irc_channel_multicast (chan, message.str, NULL); - str_free (&message); - } - - str_free (&added); str_vector_free (&added_params); - str_free (&removed); str_vector_free (&removed_params); -} - -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); - 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]); - return; - } - - struct channel *chan = str_map_find (&c->ctx->channels, target); - 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); - free (mode); - } - else - irc_handle_chan_mode_change (c, chan, &msg->params.vector[1]); - return; - } - - 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); - 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); - 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) - 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_init (&iter, &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 str_vector channels; - str_vector_init (&channels); - split_str_ignore_empty (msg->params.vector[0], ',', &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); - str_vector_free (&channels); - } - irc_send_reply (c, IRC_RPL_LISTEND); -} - -static void -irc_send_rpl_namreply (struct client *c, const struct channel *chan) -{ - struct str_vector nicks; - str_vector_init (&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); - for (struct channel_user *iter = chan->users; iter; iter = iter->next) - { - if (!on_channel && (iter->c->mode & IRC_USER_MODE_INVISIBLE)) - continue; - - struct str result; - str_init (&result); - if (iter->modes & IRC_CHAN_MODE_OPERATOR) - str_append_c (&result, '@'); - else if (iter->modes & IRC_CHAN_MODE_VOICE) - str_append_c (&result, '+'); - str_append (&result, iter->c->nickname); - str_vector_add_owned (&nicks, str_steal (&result)); - } - - if (nicks.len) - { - // FIXME: split it into multiple messages if it's too long - char *reply = join_str_vector (&nicks, ' '); - irc_send_reply (c, IRC_RPL_NAMREPLY, type, chan->name, reply); - free (reply); - } - str_vector_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_iter iter; - str_map_iter_init (&iter, &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); - - // TODO - // If no <channel> parameter is given, a list of all channels and their - // occupants is returned. At the end of this list, a list of users who - // are visible but either not on any channel or not on a visible channel - // are listed as being on `channel' "*". - irc_send_reply (c, IRC_RPL_ENDOFNAMES, "*"); - } - else - { - struct str_vector channels; - str_vector_init (&channels); - split_str_ignore_empty (msg->params.vector[0], ',', &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); - irc_send_reply (c, IRC_RPL_ENDOFNAMES, channels.vector[i]); - } - str_vector_free (&channels); - } -} - -static void -irc_send_rpl_whoreply (struct client *c, const struct channel *chan, - const struct client *target) -{ - struct str chars; - str_init (&chars); - - 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))) - { - if (user->modes & IRC_CHAN_MODE_OPERATOR) - str_append_c (&chars, '@'); - else if (user->modes & IRC_CHAN_MODE_VOICE) - str_append_c (&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_init (&iter, &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; - str_map_iter_init (&iter, &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_init (&iter, &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)); - - struct str_map_iter iter; - str_map_iter_init (&iter, &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_init (&item); - 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); - str_append_c (&item, ' '); - - // TODO: try to merge the results into as few messages as possible - irc_send_reply (c, IRC_RPL_WHOISCHANNELS, nick, item.str); - - str_free (&item); - } - - 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 str_vector masks; - str_vector_init (&masks); - const char *masks_str = msg->params.vector[msg->params.len > 1]; - split_str_ignore_empty (masks_str, ',', &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_init (&iter, &c->ctx->users); - bool found = false; - while ((target = str_map_iter_next (&iter)) - && !irc_fnmatch (mask, target->nickname)) - { - irc_send_whois_reply (c, target); - found = true; - } - if (!found) - irc_send_reply (c, IRC_ERR_NOSUCHNICK, mask); - } - } - str_vector_free (&masks); -} - -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); -} - -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); - - free (chan->topic); - chan->topic = xstrdup (msg->params.vector[1]); - - 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) -{ - struct str_map_iter iter; - str_map_iter_init (&iter, &c->ctx->channels); - struct channel *chan = str_map_iter_next (&iter), *next; - while (chan) - { - // We have to be careful here, the channel might get destroyed - next = str_map_iter_next (&iter); - if (channel_get_user (chan, c)) - irc_try_part (c, chan->name, NULL); - chan = next; - } -} - -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 str_vector channels; - str_vector_init (&channels); - split_str_ignore_empty (msg->params.vector[0], ',', &channels); - for (size_t i = 0; i < channels.len; i++) - irc_try_part (c, channels.vector[i], reason); - str_vector_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 str_vector channels; - struct str_vector users; - str_vector_init (&channels); - str_vector_init (&users); - split_str_ignore_empty (msg->params.vector[0], ',', &channels); - split_str_ignore_empty (msg->params.vector[1], ',', &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); - - str_vector_free (&channels); - str_vector_free (&users); -} - -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; - - if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY) - && !client_in_mask_list (c, &chan->invite_list)) - // TODO: exceptions caused by INVITE - 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)) - RETURN_WITH_REPLY (c, IRC_ERR_BANNEDFROMCHAN, channel_name); - - 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); - 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 str_vector channels; - struct str_vector keys; - str_vector_init (&channels); - str_vector_init (&keys); - split_str_ignore_empty (msg->params.vector[0], ',', &channels); - if (msg->params.len > 1) - split_str_ignore_empty (msg->params.vector[1], ',', &keys); - - for (size_t i = 0; i < channels.len; i++) - irc_try_join (c, channels.vector[i], - i < keys.len ? keys.vector[i] : NULL); - - str_vector_free (&channels); - str_vector_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) - { - free (c->away_message); - c->away_message = NULL; - irc_send_reply (c, IRC_RPL_UNAWAY); - } - else - { - free (c->away_message); - 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_init (&result); - - 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_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]); - 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); -} - -// ----------------------------------------------------------------------------- - -struct irc_command -{ - const char *name; - bool requires_registration; - void (*handler) (const struct irc_message *, struct client *); -}; - -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 const struct irc_command message_handlers[] = - { - { "PASS", false, irc_handle_pass }, - { "NICK", false, irc_handle_nick }, - { "USER", false, irc_handle_user }, - - { "USERHOST", true, irc_handle_userhost }, - { "LUSERS", true, irc_handle_lusers }, - { "MOTD", true, irc_handle_motd }, - { "PING", true, irc_handle_ping }, - { "PONG", false, irc_handle_pong }, - { "QUIT", false, irc_handle_quit }, - { "TIME", true, irc_handle_time }, - { "VERSION", true, irc_handle_version }, - { "USERS", true, irc_handle_users }, - { "SUMMON", true, irc_handle_summon }, - { "AWAY", true, irc_handle_away }, - { "ADMIN", true, irc_handle_admin }, - - { "MODE", true, irc_handle_mode }, - { "PRIVMSG", true, irc_handle_privmsg }, - { "NOTICE", true, irc_handle_notice }, - { "JOIN", true, irc_handle_join }, - { "PART", true, irc_handle_part }, - { "KICK", true, irc_handle_kick }, - { "TOPIC", true, irc_handle_topic }, - { "LIST", true, irc_handle_list }, - { "NAMES", true, irc_handle_names }, - { "WHO", true, irc_handle_who }, - { "WHOIS", true, irc_handle_whois }, - { "ISON", true, irc_handle_ison }, - - { "KILL", true, irc_handle_kill }, - { "DIE", true, irc_handle_die }, - }; - - 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) -{ - (void) raw; - - struct client *c = user_data; - if (c->closing_link) - 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 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_ensure_space (buf, 512); - n_read = recv (c->socket_fd, buf->str + buf->len, - buf->alloc - buf->len - 1 /* null byte */, 0); - - 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__, "recv", strerror (errno)); - client_kill (c, strerror (errno)); - return false; - } -} - -static bool -irc_try_read_ssl (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_ensure_space (buf, 512); - 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 = send (c->socket_fd, buf->str, buf->len, 0); - 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__, "send", strerror (errno)); - client_kill (c, strerror (errno)); - return false; - } - return true; -} - -static bool -irc_try_write_ssl (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) - { - 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_ssl (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; - 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_ssl (struct client *c) -{ - // SSL support not enabled - if (!c->ctx->ssl_ctx) - return false; - - c->ssl = SSL_new (c->ctx->ssl_ctx); - if (!c->ssl) - goto error_ssl_1; - - if (!SSL_set_fd (c->ssl, c->socket_fd)) - goto error_ssl_2; - SSL_set_accept_state (c->ssl); - return true; - -error_ssl_2: - SSL_free (c->ssl); - c->ssl = NULL; -error_ssl_1: - // XXX: these error strings are really nasty; also there could be - // multiple errors on the OpenSSL stack. - print_debug ("%s: %s: %s", "could not initialize SSL", - c->hostname, ERR_error_string (ERR_get_error (), NULL)); - 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_ssl (c) && !client_initialize_ssl (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_ssl (c) || !irc_try_write_ssl (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->write_buffer.len) - client_kill (c, NULL); -} - -static void -client_update_poller (struct client *c, const struct pollfd *pfd) -{ - 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->write_buffer.len) - new_events |= POLLOUT; - - hard_assert (new_events != 0); - if (!pfd || pfd->events != new_events) - poller_set (&c->ctx->poller, c->socket_fd, new_events, - (poller_dispatcher_func) on_client_ready, c); -} - -static void -on_irc_client_available (const struct pollfd *pfd, void *user_data) -{ - (void) pfd; - struct server_context *ctx = user_data; - - while (true) - { - // XXX: `struct sockaddr_storage' is not the most portable thing - struct sockaddr_storage peer; - socklen_t peer_len = sizeof peer; - - int fd = accept (pfd->fd, (struct sockaddr *) &peer, &peer_len); - if (fd == -1) - { - if (errno == EAGAIN) - break; - if (errno == EINTR - || errno == ECONNABORTED) - continue; - - // TODO: handle resource exhaustion (EMFILE, ENFILE) specially - // (stop accepting new connections and wait until we close some). - // FIXME: handle this better, bring the server down cleanly. - exit_fatal ("%s: %s", "accept", strerror (errno)); - } - - if (ctx->max_connections != 0 && ctx->n_clients >= ctx->max_connections) - { - print_debug ("connection limit reached, refusing connection"); - close (fd); - continue; - } - - char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown"; - int err = getnameinfo ((struct sockaddr *) &peer, peer_len, - host, sizeof host, port, sizeof port, NI_NUMERICSERV); - if (err) - print_debug ("%s: %s", "getnameinfo", gai_strerror (err)); - print_debug ("accepted connection from %s:%s", host, port); - - struct client *c = xmalloc (sizeof *c); - client_init (c); - c->ctx = ctx; - c->socket_fd = fd; - c->hostname = xstrdup (host); - c->last_active = time (NULL); - LIST_PREPEND (ctx->clients, c); - ctx->n_clients++; - - set_blocking (fd, false); - client_update_poller (c, NULL); - client_set_kill_timer (c); - } -} - -// --- Application setup ------------------------------------------------------- - -static int -irc_ssl_verify_callback (int verify_ok, X509_STORE_CTX *ctx) -{ - (void) verify_ok; - (void) ctx; - - // We only want to provide additional privileges based on the client's - // certificate, so let's not terminate the connection because of a failure. - return 1; -} - -static bool -irc_initialize_ssl (struct server_context *ctx, struct error **e) -{ - const char *ssl_cert = str_map_find (&ctx->config, "ssl_cert"); - const char *ssl_key = str_map_find (&ctx->config, "ssl_key"); - - // Only try to enable SSL support if the user configures it; it is not - // a failure if no one has requested it. - if (!ssl_cert && !ssl_key) - return true; - - if (!ssl_cert) - error_set (e, "no SSL certificate set"); - else if (!ssl_key) - error_set (e, "no SSL private key set"); - if (!ssl_cert || !ssl_key) - return false; - - char *cert_path = resolve_config_filename (ssl_cert); - char *key_path = resolve_config_filename (ssl_key); - if (!cert_path) - error_set (e, "%s: %s", "cannot open file", ssl_cert); - else if (!key_path) - error_set (e, "%s: %s", "cannot open file", ssl_key); - if (!cert_path || !key_path) - return false; - - ctx->ssl_ctx = SSL_CTX_new (SSLv23_server_method ()); - if (!ctx->ssl_ctx) - { - // XXX: these error strings are really nasty; also there could be - // multiple errors on the OpenSSL stack. - error_set (e, "%s: %s", "could not initialize SSL", - ERR_error_string (ERR_get_error (), NULL)); - goto error_ssl_1; - } - SSL_CTX_set_verify (ctx->ssl_ctx, - SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, irc_ssl_verify_callback); - // XXX: maybe we should call SSL_CTX_set_options() for some workarounds - - 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); - - // XXX: perhaps we should read the files ourselves for better messages - if (!SSL_CTX_use_certificate_chain_file (ctx->ssl_ctx, cert_path)) - { - error_set (e, "%s: %s", "setting the SSL client certificate failed", - ERR_error_string (ERR_get_error (), NULL)); - goto error_ssl_2; - } - if (!SSL_CTX_use_PrivateKey_file (ctx->ssl_ctx, key_path, SSL_FILETYPE_PEM)) - { - error_set (e, "%s: %s", "setting the SSL private key failed", - ERR_error_string (ERR_get_error (), NULL)); - goto error_ssl_2; - } - - // TODO: SSL_CTX_check_private_key()? It has probably already been checked - // by SSL_CTX_use_PrivateKey_file() above. - - // Gah, spare me your awkward semantics, I just want to push data! - // XXX: do we want SSL_MODE_AUTO_RETRY as well? I guess not. - SSL_CTX_set_mode (ctx->ssl_ctx, - SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE); - return true; - -error_ssl_2: - SSL_CTX_free (ctx->ssl_ctx); - ctx->ssl_ctx = NULL; -error_ssl_1: - return false; -} - -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_config_filename (catalog); - 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_config_filename (motd); - 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_init (&line); - while (read_line (fp, &line)) - str_vector_add_owned (&ctx->motd, str_steal (&line)); - str_free (&line); - - fclose (fp); - 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) -{ - unsigned long ul; -#define PARSE_UNSIGNED(name, min, max) \ - const char *name = str_map_find (&ctx->config, #name); \ - hard_assert (name != NULL); \ - if (!xstrtoul (&ul, name, 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; \ - } \ - ctx->name = ul - - PARSE_UNSIGNED (ping_interval, 1, UINT_MAX); - PARSE_UNSIGNED (max_connections, 0, UINT_MAX); - - bool result = true; - struct str_vector fingerprints; - str_vector_init (&fingerprints); - const char *operators = str_map_find (&ctx->config, "operators"); - if (operators) - split_str_ignore_empty (operators, ',', &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); - } - str_vector_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 - { - char hostname[HOST_NAME_MAX]; - 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 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); - - char real_host[NI_MAXHOST], real_port[NI_MAXSERV]; - real_host[0] = real_port[0] = '\0'; - int err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen, - real_host, sizeof real_host, real_port, sizeof real_port, - NI_NUMERICHOST | NI_NUMERICSERV); - if (err) - print_debug ("%s: %s", "getnameinfo", gai_strerror (err)); - - if (bind (fd, gai_iter->ai_addr, gai_iter->ai_addrlen)) - print_error ("bind to %s:%s failed: %s", - real_host, real_port, strerror (errno)); - else if (listen (fd, 16 /* arbitrary number */)) - print_error ("listen at %s:%s failed: %s", - real_host, real_port, strerror (errno)); - else - { - print_status ("listening at %s:%s", real_host, real_port); - return fd; - } - - xclose (fd); - return -1; -} - -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, *gai_result, *gai_iter; - memset (&gai_hints, 0, sizeof gai_hints); - - gai_hints.ai_socktype = SOCK_STREAM; - gai_hints.ai_flags = AI_PASSIVE; - - int err = getaddrinfo (bind_host, bind_port, &gai_hints, &gai_result); - if (err) - { - error_set (e, "%s: %s: %s", - "network setup failed", "getaddrinfo", gai_strerror (err)); - return false; - } - - int fd; - for (gai_iter = gai_result; gai_iter; gai_iter = gai_iter->ai_next) - { - if (ctx->n_listen_fds >= N_ELEMENTS (ctx->listen_fds)) - break; - if ((fd = irc_listen (gai_iter)) == -1) - continue; - - ctx->listen_fds[ctx->n_listen_fds++] = fd; - set_blocking (fd, false); - poller_set (&ctx->poller, fd, POLLIN, - (poller_dispatcher_func) on_irc_client_available, ctx); - break; - } - freeaddrinfo (gai_result); - - if (!ctx->n_listen_fds) - { - error_set (e, "network setup failed"); - 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 (void) -{ - // TODO: create and lock a PID file? - print_status ("daemonizing..."); - - if (chdir ("/")) - exit_fatal ("%s: %s", "chdir", strerror (errno)); - - pid_t pid; - if ((pid = fork ()) < 0) - exit_fatal ("%s: %s", "fork", strerror (errno)); - else if (pid) - 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; - - // XXX: we may close our own descriptors this way, crippling ourselves - 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)); -} - -static void -print_usage (const char *program_name) -{ - fprintf (stderr, - "Usage: %s [OPTION]...\n" - "Experimental IRC server.\n" - "\n" - " -d, --debug run in debug mode (do not daemonize)\n" - " -h, --help display this help and exit\n" - " -V, --version output version information and exit\n" - " --write-default-cfg [filename]\n" - " write a default configuration file and exit\n", - program_name); -} - -int -main (int argc, char *argv[]) -{ - const char *invocation_name = argv[0]; - - static struct option opts[] = - { - { "debug", no_argument, NULL, 'd' }, - { "help", no_argument, NULL, 'h' }, - { "version", no_argument, NULL, 'V' }, - { "write-default-cfg", optional_argument, NULL, 'w' }, - { NULL, 0, NULL, 0 } - }; - - while (1) - { - int c, opt_index; - - c = getopt_long (argc, argv, "dhV", opts, &opt_index); - if (c == -1) - break; - - switch (c) - { - case 'd': - g_debug_mode = true; - break; - case 'h': - print_usage (invocation_name); - exit (EXIT_SUCCESS); - case 'V': - printf (PROGRAM_NAME " " PROGRAM_VERSION "\n"); - exit (EXIT_SUCCESS); - case 'w': - call_write_default_config (optarg, g_config_table); - exit (EXIT_SUCCESS); - default: - print_error ("wrong options"); - exit (EXIT_FAILURE); - } - } - - print_status (PROGRAM_NAME " " PROGRAM_VERSION " starting"); - setup_signal_handlers (); - - SSL_library_init (); - atexit (EVP_cleanup); - SSL_load_error_strings (); - // XXX: ERR_load_BIO_strings()? Anything else? - atexit (ERR_free_strings); - - struct server_context ctx; - server_context_init (&ctx); - irc_register_handlers (&ctx); - - struct error *e = NULL; - if (!read_config_file (&ctx.config, &e)) - { - print_error ("error loading configuration: %s", e->message); - error_free (e); - exit (EXIT_FAILURE); - } - - poller_set (&ctx.poller, g_signal_pipe[0], POLLIN, - (poller_dispatcher_func) on_signal_pipe_readable, &ctx); - - if (!irc_initialize_ssl (&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)) - { - print_error ("%s", e->message); - error_free (e); - exit (EXIT_FAILURE); - } - - if (!g_debug_mode) - daemonize (); - - ctx.polling = true; - while (ctx.polling) - poller_run (&ctx.poller); - - server_context_free (&ctx); - return EXIT_SUCCESS; -} |