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-rw-r--r--src/kike.c3251
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;
-}