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-rw-r--r--kike.c4079
1 files changed, 0 insertions, 4079 deletions
diff --git a/kike.c b/kike.c
deleted file mode 100644
index e805e00..0000000
--- a/kike.c
+++ /dev/null
@@ -1,4079 +0,0 @@
-/*
- * kike.c: an IRC daemon
- *
- * Copyright (c) 2014 - 2020, Přemysl Eric Janouch <p@janouch.name>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-
-#include "config.h"
-#define PROGRAM_NAME "kike"
-
-#define WANT_SYSLOG_LOGGING
-#include "common.c"
-#include "kike-replies.c"
-#include <nl_types.h>
-
-enum { PIPE_READ, PIPE_WRITE };
-
-// FIXME: don't use time_t to compute time deltas
-
-// --- Configuration (application-specific) ------------------------------------
-
-// Just get rid of the crappiest ciphers available by default
-#define DEFAULT_CIPHERS "DEFAULT:!MEDIUM:!LOW"
-
-static struct simple_config_item g_config_table[] =
-{
- { "pid_file", NULL, "Path or name of the PID file" },
- { "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" },
- { "tls_cert", NULL, "Server TLS certificate (PEM)" },
- { "tls_key", NULL, "Server TLS private key (PEM)" },
- { "tls_ciphers", DEFAULT_CIPHERS, "OpenSSL cipher list" },
-
- { "operators", NULL, "IRCop TLS client cert. SHA-1 fingerprints" },
-
- { "max_connections", "0", "Global connection limit" },
- { "ping_interval", "180", "Interval between PINGs (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));
-}
-
-// --- Rate limiter ------------------------------------------------------------
-
-struct flood_detector
-{
- unsigned interval; ///< Interval for the limit
- unsigned limit; ///< Maximum number of events allowed
-
- time_t *timestamps; ///< Timestamps of last events
- unsigned pos; ///< Index of the oldest event
-};
-
-static void
-flood_detector_init (struct flood_detector *self,
- unsigned interval, unsigned limit)
-{
- self->interval = interval;
- self->limit = limit;
- self->timestamps = xcalloc (limit + 1, sizeof *self->timestamps);
- self->pos = 0;
-}
-
-static void
-flood_detector_free (struct flood_detector *self)
-{
- free (self->timestamps);
-}
-
-static bool
-flood_detector_check (struct flood_detector *self)
-{
- time_t now = time (NULL);
- self->timestamps[self->pos++] = now;
- if (self->pos > self->limit)
- self->pos = 0;
-
- time_t begin = now - self->interval;
- size_t count = 0;
- for (size_t i = 0; i <= self->limit; i++)
- if (self->timestamps[i] >= begin)
- count++;
- return count <= self->limit;
-}
-
-// --- 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)
- {
- cache = regex_cache_make ();
- 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
-// "shortname" from RFC 2812 doesn't work how its author thought it would.
-#define SN "[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;
-}
-
-// TODO: we should actually use this, though what should we do on failure?
-static bool
-irc_is_valid_host (const char *host)
-{
- return irc_validate_hostname (host) == VALIDATION_OK
- || irc_is_valid_hostaddr (host);
-}
-
-// TODO: currently, we are almost encoding-agnostic (strings just need to be
-// ASCII-compatible). We should at least have an option to enforce a specific
-// encoding, such as UTF-8. Note that with Unicode we should not allow all
-// character clasess and exclude the likes of \pM with the goal of enforcing
-// NFC-normalized identifiers--utf8proc is a good candidate library to handle
-// the categorization and validation.
-
-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]{40}$", 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)
-};
-
-enum
-{
- IRC_CAP_MULTI_PREFIX = (1 << 0),
- IRC_CAP_INVITE_NOTIFY = (1 << 1),
- IRC_CAP_ECHO_MESSAGE = (1 << 2),
- IRC_CAP_USERHOST_IN_NAMES = (1 << 3),
- IRC_CAP_SERVER_TIME = (1 << 4)
-};
-
-struct client
-{
- LIST_HEADER (struct client)
- struct server_context *ctx; ///< Server context
-
- time_t opened; ///< When the connection was opened
- size_t n_sent_messages; ///< Number of sent messages total
- size_t sent_bytes; ///< Number of sent bytes total
- size_t n_received_messages; ///< Number of received messages total
- size_t received_bytes; ///< Number of received bytes total
-
- int socket_fd; ///< The TCP socket
- struct str read_buffer; ///< Unprocessed input
- struct str write_buffer; ///< Output yet to be sent out
-
- struct poller_fd socket_event; ///< The socket can be read/written to
- struct poller_timer ping_timer; ///< We should send a ping
- struct poller_timer timeout_timer; ///< Connection seems to be dead
- struct poller_timer kill_timer; ///< Hard kill timeout
-
- unsigned long cap_version; ///< CAP protocol version
- unsigned caps_enabled; ///< Enabled capabilities
-
- unsigned initialized : 1; ///< Has any data been received yet?
- unsigned cap_negotiating : 1; ///< Negotiating capabilities
- unsigned registered : 1; ///< The user has registered
- unsigned closing_link : 1; ///< Closing link
- unsigned half_closed : 1; ///< Closing link: conn. is half-closed
-
- unsigned ssl_rx_want_tx : 1; ///< SSL_read() wants to write
- unsigned ssl_tx_want_rx : 1; ///< 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
- char *port; ///< Port of the peer as a string
- char *address; ///< Full address
-
- unsigned mode; ///< User's mode
- char *away_message; ///< Away message
- time_t last_active; ///< Last PRIVMSG, to get idle time
- struct str_map invites; ///< Channel invitations by operators
- struct flood_detector antiflood; ///< Flood detector
-
- struct async_getnameinfo *gni; ///< Backwards DNS resolution
- struct poller_timer gni_timer; ///< Backwards DNS resolution timeout
-};
-
-static struct client *
-client_new (void)
-{
- struct client *self = xcalloc (1, sizeof *self);
- self->socket_fd = -1;
- self->read_buffer = str_make ();
- self->write_buffer = str_make ();
- self->cap_version = 301;
- // TODO: make this configurable and more fine-grained
- flood_detector_init (&self->antiflood, 10, 20);
- self->invites = str_map_make (NULL);
- self->invites.key_xfrm = irc_strxfrm;
- return self;
-}
-
-static void
-client_destroy (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->ssl_cert_fingerprint);
-
- free (self->nickname);
- free (self->username);
- free (self->realname);
-
- free (self->hostname);
- free (self->port);
- free (self->address);
-
- free (self->away_message);
- flood_detector_free (&self->antiflood);
- str_map_free (&self->invites);
-
- if (self->gni)
- async_cancel (&self->gni->async);
- free (self);
-}
-
-static void client_close_link (struct client *c, const char *reason);
-static void client_kill (struct client *c, const char *reason);
-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 (struct 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
- time_t created; ///< Creation time
-
- char *topic; ///< Channel topic
- char *topic_who; ///< Who set the topic
- time_t topic_time; ///< When the topic was set
-
- struct channel_user *users; ///< Channel users
-
- struct strv ban_list; ///< Ban list
- struct strv exception_list; ///< Exceptions from bans
- struct strv 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 ("");
-
- self->ban_list = strv_make ();
- self->exception_list = strv_make ();
- self->invite_list = strv_make ();
- return self;
-}
-
-static void
-channel_delete (struct channel *self)
-{
- free (self->name);
- free (self->key);
- free (self->topic);
- free (self->topic_who);
-
- struct channel_user *link, *tmp;
- for (link = self->users; link; link = tmp)
- {
- tmp = link->next;
- free (link);
- }
-
- strv_free (&self->ban_list);
- strv_free (&self->exception_list);
- strv_free (&self->invite_list);
-
- free (self);
-}
-
-static char *
-channel_get_mode (struct channel *self, bool disclose_secrets)
-{
- struct str mode = str_make ();
- 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 whowas_info
-{
- char *nickname; ///< IRC nickname
- char *username; ///< IRC username
- char *realname; ///< IRC realname
- char *hostname; ///< Hostname shown to the network
-};
-
-struct whowas_info *
-whowas_info_new (struct client *c)
-{
- struct whowas_info *self = xmalloc (sizeof *self);
- self->nickname = xstrdup (c->nickname);
- self->username = xstrdup (c->username);
- self->realname = xstrdup (c->realname);
- self->hostname = xstrdup (c->hostname);
- return self;
-}
-
-static void
-whowas_info_destroy (struct whowas_info *self)
-{
- free (self->nickname);
- free (self->username);
- free (self->realname);
- free (self->hostname);
- free (self);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-struct irc_command
-{
- const char *name;
- bool requires_registration;
- void (*handler) (const struct irc_message *, struct client *);
-
- size_t n_received; ///< Number of commands received
- size_t bytes_received; ///< Number of bytes received total
-};
-
-struct server_context
-{
- int *listen_fds; ///< Listening socket FD's
- struct poller_fd *listen_events; ///< New connections available
- size_t listen_len; ///< Number of listening sockets
- size_t listen_alloc; ///< How many we've allocated
-
- time_t started; ///< When has the server been started
-
- SSL_CTX *ssl_ctx; ///< SSL context
- struct client *clients; ///< Clients
- unsigned n_clients; ///< Current number of connections
-
- struct str_map users; ///< Maps nicknames to clients
- struct str_map channels; ///< Maps channel names to data
- struct str_map handlers; ///< Message handlers
- struct str_map cap_handlers; ///< CAP message handlers
-
- struct str_map whowas; ///< WHOWAS registry
-
- struct poller poller; ///< Manages polled description
- struct poller_timer quit_timer; ///< Quit timeout timer
- bool quitting; ///< User requested quitting
- bool polling; ///< The event loop is running
-
- struct poller_fd signal_event; ///< Got a signal
-
- struct str_map config; ///< Server configuration
- char *server_name; ///< Our server name
- unsigned ping_interval; ///< Ping interval in seconds
- unsigned max_connections; ///< Max. connections allowed or 0
- struct strv motd; ///< MOTD (none if empty)
- nl_catd catalog; ///< Message catalog for server msgs
- struct str_map operators; ///< TLS cert. fingerprints for IRCops
-};
-
-static void
-on_irc_quit_timeout (void *user_data)
-{
- struct server_context *ctx = user_data;
- struct client *iter, *next;
- for (iter = ctx->clients; iter; iter = next)
- {
- next = iter->next;
- // irc_initiate_quit() has already unregistered the client
- client_kill (iter, "Shutting down");
- }
-}
-
-static void
-server_context_init (struct server_context *self)
-{
- memset (self, 0, sizeof *self);
-
- self->users = str_map_make (NULL);
- self->users.key_xfrm = irc_strxfrm;
- self->channels = str_map_make ((str_map_free_fn) channel_delete);
- self->channels.key_xfrm = irc_strxfrm;
- self->handlers = str_map_make (NULL);
- self->handlers.key_xfrm = irc_strxfrm;
- self->cap_handlers = str_map_make (NULL);
- self->cap_handlers.key_xfrm = irc_strxfrm;
-
- self->whowas = str_map_make ((str_map_free_fn) whowas_info_destroy);
- self->whowas.key_xfrm = irc_strxfrm;
-
- poller_init (&self->poller);
- self->quit_timer = poller_timer_make (&self->poller);
- self->quit_timer.dispatcher = on_irc_quit_timeout;
- self->quit_timer.user_data = self;
-
- self->config = str_map_make (free);
- simple_config_load_defaults (&self->config, g_config_table);
-
- self->motd = strv_make ();
- self->catalog = (nl_catd) -1;
- self->operators = str_map_make (NULL);
- // The regular irc_strxfrm() is sufficient for fingerprints
- self->operators.key_xfrm = irc_strxfrm;
-}
-
-static void
-server_context_free (struct server_context *self)
-{
- str_map_free (&self->config);
-
- for (size_t i = 0; i < self->listen_len; i++)
- {
- poller_fd_reset (&self->listen_events[i]);
- xclose (self->listen_fds[i]);
- }
- free (self->listen_fds);
- free (self->listen_events);
-
- hard_assert (!self->clients);
- if (self->ssl_ctx)
- SSL_CTX_free (self->ssl_ctx);
-
- free (self->server_name);
- str_map_free (&self->users);
- str_map_free (&self->channels);
- str_map_free (&self->handlers);
- str_map_free (&self->cap_handlers);
- str_map_free (&self->whowas);
- poller_free (&self->poller);
-
- strv_free (&self->motd);
- if (self->catalog != (nl_catd) -1)
- catclose (self->catalog);
- str_map_free (&self->operators);
-}
-
-static const char *
-irc_get_text (struct server_context *ctx, int id, const char *def)
-{
- if (!soft_assert (def != NULL))
- def = "";
- if (ctx->catalog == (nl_catd) -1)
- return def;
- return catgets (ctx->catalog, 1, id, def);
-}
-
-static void
-irc_try_finish_quit (struct server_context *ctx)
-{
- if (!ctx->n_clients && ctx->quitting)
- {
- poller_timer_reset (&ctx->quit_timer);
- ctx->polling = false;
- }
-}
-
-static void
-irc_initiate_quit (struct server_context *ctx)
-{
- print_status ("shutting down");
-
- for (size_t i = 0; i < ctx->listen_len; i++)
- {
- poller_fd_reset (&ctx->listen_events[i]);
- xclose (ctx->listen_fds[i]);
- }
- ctx->listen_len = 0;
-
- for (struct client *iter = ctx->clients; iter; iter = iter->next)
- if (!iter->closing_link)
- client_close_link (iter, "Shutting down");
-
- ctx->quitting = true;
- poller_timer_set (&ctx->quit_timer, 5000);
- irc_try_finish_quit (ctx);
-}
-
-static struct channel *
-irc_channel_create (struct server_context *ctx, const char *name)
-{
- struct channel *chan = channel_new ();
- chan->ctx = ctx;
- chan->name = xstrdup (name);
- chan->created = time (NULL);
- str_map_set (&ctx->channels, name, chan);
- return chan;
-}
-
-static void
-irc_channel_destroy_if_empty (struct server_context *ctx, struct channel *chan)
-{
- if (!chan->users)
- str_map_set (&ctx->channels, chan->name, NULL);
-}
-
-static void
-irc_send_to_roommates (struct client *c, const char *message)
-{
- struct str_map targets = str_map_make (NULL);
- targets.key_xfrm = irc_strxfrm;
-
- struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
- struct channel *chan;
- while ((chan = str_map_iter_next (&iter)))
- {
- if (chan->modes & IRC_CHAN_MODE_QUIET
- || !channel_get_user (chan, c))
- continue;
- for (struct channel_user *iter = chan->users; iter; iter = iter->next)
- str_map_set (&targets, iter->c->nickname, iter->c);
- }
-
- iter = str_map_iter_make (&targets);
- struct client *target;
- while ((target = str_map_iter_next (&iter)))
- if (target != c)
- client_send (target, "%s", message);
- str_map_free (&targets);
-}
-
-// --- Clients (continued) -----------------------------------------------------
-
-static void
-client_mode_to_str (unsigned m, struct str *out)
-{
- if (m & IRC_USER_MODE_INVISIBLE) str_append_c (out, 'i');
- if (m & IRC_USER_MODE_RX_WALLOPS) str_append_c (out, 'w');
- if (m & IRC_USER_MODE_RESTRICTED) str_append_c (out, 'r');
- if (m & IRC_USER_MODE_OPERATOR) str_append_c (out, 'o');
- if (m & IRC_USER_MODE_RX_SERVER_NOTICES) str_append_c (out, 's');
-}
-
-static char *
-client_get_mode (struct client *self)
-{
- struct str mode = str_make ();
- if (self->away_message)
- str_append_c (&mode, 'a');
- client_mode_to_str (self->mode, &mode);
- return str_steal (&mode);
-}
-
-static void
-client_send_str (struct client *c, const struct str *s)
-{
- hard_assert (!c->closing_link);
-
- size_t old_sendq = c->write_buffer.len;
-
- // So far there's only one message tag we use, so we can do it simple;
- // note that a 1024-character limit applies to messages with tags on
- if (c->caps_enabled & IRC_CAP_SERVER_TIME)
- {
- long milliseconds; char buf[32]; struct tm tm;
- time_t now = unixtime_msec (&milliseconds);
- if (soft_assert (strftime (buf, sizeof buf,
- "%Y-%m-%dT%T", gmtime_r (&now, &tm))))
- str_append_printf (&c->write_buffer,
- "@time=%s.%03ldZ ", buf, milliseconds);
- }
-
- // TODO: kill the connection above some "SendQ" threshold (careful!)
- str_append_data (&c->write_buffer, s->str,
- MIN (s->len, IRC_MAX_MESSAGE_LENGTH));
- str_append (&c->write_buffer, "\r\n");
- // XXX: we might want to move this elsewhere, so that it doesn't get called
- // as often; it's going to cause a lot of syscalls with epoll.
- client_update_poller (c, NULL);
-
- // Technically we haven't sent it yet but that's a minor detail
- c->n_sent_messages++;
- c->sent_bytes += c->write_buffer.len - old_sendq;
-}
-
-static void
-client_send (struct client *c, const char *format, ...)
-{
- struct str tmp = str_make ();
-
- va_list ap;
- va_start (ap, format);
- str_append_vprintf (&tmp, format, ap);
- va_end (ap);
-
- client_send_str (c, &tmp);
- str_free (&tmp);
-}
-
-static void
-client_add_to_whowas (struct client *c)
-{
- // Only keeping one entry for each nickname
- // TODO: make sure this list doesn't get too long, for example by
- // putting them in a linked list ordered by time
- str_map_set (&c->ctx->whowas, c->nickname, whowas_info_new (c));
-}
-
-static void
-client_unregister (struct client *c, const char *reason)
-{
- if (!c->registered)
- return;
-
- char *message = xstrdup_printf (":%s!%s@%s QUIT :%s",
- c->nickname, c->username, c->hostname, reason);
- irc_send_to_roommates (c, message);
- free (message);
-
- struct str_map_unset_iter iter =
- str_map_unset_iter_make (&c->ctx->channels);
- struct channel *chan;
- while ((chan = str_map_unset_iter_next (&iter)))
- {
- struct channel_user *user;
- if (!(user = channel_get_user (chan, c)))
- continue;
- channel_remove_user (chan, user);
- irc_channel_destroy_if_empty (c->ctx, chan);
- }
- str_map_unset_iter_free (&iter);
-
- client_add_to_whowas (c);
-
- str_map_set (&c->ctx->users, c->nickname, NULL);
- cstr_set (&c->nickname, NULL);
- c->registered = false;
-}
-
-static void
-client_kill (struct client *c, const char *reason)
-{
- struct server_context *ctx = c->ctx;
- client_unregister (c, reason ? reason : "Client exited");
-
- if (c->address)
- // Only log the event if address resolution has finished
- print_debug ("closed connection to %s (%s)", c->address,
- reason ? reason : "");
-
- if (c->ssl)
- // Note that we might have already called this once, but that is fine
- (void) SSL_shutdown (c->ssl);
-
- xclose (c->socket_fd);
- c->socket_fd = -1;
-
- // We don't fork any children, this is okay
- c->socket_event.closed = true;
- poller_fd_reset (&c->socket_event);
- client_cancel_timers (c);
-
- LIST_UNLINK (ctx->clients, c);
- ctx->n_clients--;
- client_destroy (c);
-
- irc_try_finish_quit (ctx);
-}
-
-static void
-client_close_link (struct client *c, const char *reason)
-{
- // Let's just cut the connection, the client can try again later.
- // We also want to avoid accidentally setting poller events before
- // address resolution has finished.
- if (!c->initialized)
- {
- client_kill (c, reason);
- return;
- }
- if (!soft_assert (!c->closing_link))
- return;
-
- // We push an `ERROR' message to the write buffer and let the poller send
- // it, with some arbitrary timeout. The `closing_link' state makes sure
- // that a/ we ignore any successive messages, and b/ that the connection
- // is killed after the write buffer is transferred and emptied.
- client_send (c, "ERROR :Closing Link: %s[%s] (%s)",
- c->nickname ? c->nickname : "*",
- c->hostname /* TODO host IP? */, reason);
- c->closing_link = true;
-
- client_unregister (c, reason);
- client_set_kill_timer (c);
-}
-
-static bool
-client_in_mask_list (const struct client *c, const struct strv *mask)
-{
- char *client = xstrdup_printf ("%s!%s@%s",
- c->nickname, c->username, c->hostname);
- bool result = false;
- for (size_t i = 0; i < mask->len; i++)
- if (!irc_fnmatch (mask->vector[i], client))
- {
- result = true;
- break;
- }
- free (client);
- return result;
-}
-
-static char *
-client_get_ssl_cert_fingerprint (struct client *c)
-{
- if (!c->ssl)
- return NULL;
-
- X509 *peer_cert = SSL_get_peer_certificate (c->ssl);
- if (!peer_cert)
- return NULL;
-
- int cert_len = i2d_X509 (peer_cert, NULL);
- if (cert_len < 0)
- return NULL;
-
- unsigned char cert[cert_len], *p = cert;
- if (i2d_X509 (peer_cert, &p) < 0)
- return NULL;
-
- unsigned char hash[SHA_DIGEST_LENGTH];
- SHA1 (cert, cert_len, hash);
-
- struct str fingerprint = str_make ();
- for (size_t i = 0; i < sizeof hash; i++)
- str_append_printf (&fingerprint, "%02x", hash[i]);
- return str_steal (&fingerprint);
-}
-
-// --- Timers ------------------------------------------------------------------
-
-static void
-client_cancel_timers (struct client *c)
-{
- poller_timer_reset (&c->kill_timer);
- poller_timer_reset (&c->timeout_timer);
- poller_timer_reset (&c->ping_timer);
- poller_timer_reset (&c->gni_timer);
-}
-
-static void
-client_set_timer (struct client *c,
- struct poller_timer *timer, unsigned interval)
-{
- client_cancel_timers (c);
- poller_timer_set (timer, interval * 1000);
-}
-
-static void
-on_client_kill_timer (struct client *c)
-{
- hard_assert (!c->initialized || c->closing_link);
- client_kill (c, NULL);
-}
-
-static void
-client_set_kill_timer (struct client *c)
-{
- client_set_timer (c, &c->kill_timer, c->ctx->ping_interval);
-}
-
-static void
-on_client_timeout_timer (struct client *c)
-{
- char *reason = xstrdup_printf
- ("Ping timeout: >%u seconds", c->ctx->ping_interval);
- client_close_link (c, reason);
- free (reason);
-}
-
-static void
-on_client_ping_timer (struct client *c)
-{
- hard_assert (!c->closing_link);
- client_send (c, "PING :%s", c->ctx->server_name);
- client_set_timer (c, &c->timeout_timer, c->ctx->ping_interval);
-}
-
-static void
-client_set_ping_timer (struct client *c)
-{
- client_set_timer (c, &c->ping_timer, c->ctx->ping_interval);
-}
-
-// --- IRC command handling ----------------------------------------------------
-
-static void
-irc_make_reply (struct client *c, int id, va_list ap, struct str *output)
-{
- str_append_printf (output, ":%s %03d %s ",
- c->ctx->server_name, id, c->nickname ? c->nickname : "*");
- str_append_vprintf (output,
- irc_get_text (c->ctx, id, g_default_replies[id]), ap);
-}
-
-// XXX: this way we cannot typecheck the arguments, so we must be careful
-static void
-irc_send_reply (struct client *c, int id, ...)
-{
- struct str reply = str_make ();
-
- va_list ap;
- va_start (ap, id);
- irc_make_reply (c, id, ap, &reply);
- va_end (ap);
-
- client_send_str (c, &reply);
- str_free (&reply);
-}
-
-/// Send a space-separated list of words across as many replies as needed
-static void
-irc_send_reply_vector (struct client *c, int id, char **items, ...)
-{
- struct str common = str_make ();
-
- va_list ap;
- va_start (ap, items);
- irc_make_reply (c, id, ap, &common);
- va_end (ap);
-
- // We always send at least one message (there might be a client that
- // expects us to send this message at least once)
- do
- {
- struct str reply = str_make ();
- str_append_str (&reply, &common);
-
- // If not even a single item fits in the limit (which may happen,
- // in theory) it just gets cropped. We could also skip it.
- if (*items)
- str_append (&reply, *items++);
-
- // Append as many items as fits in a single message
- while (*items
- && reply.len + 1 + strlen (*items) <= IRC_MAX_MESSAGE_LENGTH)
- str_append_printf (&reply, " %s", *items++);
-
- client_send_str (c, &reply);
- str_free (&reply);
- }
- while (*items);
- str_free (&common);
-}
-
-#define RETURN_WITH_REPLY(c, ...) \
- BLOCK_START \
- irc_send_reply ((c), __VA_ARGS__); \
- return; \
- BLOCK_END
-
-static void
-irc_send_motd (struct client *c)
-{
- struct server_context *ctx = c->ctx;
- if (!ctx->motd.len)
- RETURN_WITH_REPLY (c, IRC_ERR_NOMOTD);
-
- irc_send_reply (c, IRC_RPL_MOTDSTART, ctx->server_name);
- for (size_t i = 0; i < ctx->motd.len; i++)
- irc_send_reply (c, IRC_RPL_MOTD, ctx->motd.vector[i]);
- irc_send_reply (c, IRC_RPL_ENDOFMOTD);
-}
-
-static void
-irc_send_lusers (struct client *c)
-{
- int n_users = 0, n_services = 0, n_opers = 0, n_unknown = 0;
- for (struct client *link = c->ctx->clients; link; link = link->next)
- {
- if (link->registered)
- n_users++;
- else
- n_unknown++;
- if (link->mode & IRC_USER_MODE_OPERATOR)
- n_opers++;
- }
-
- int n_channels = 0;
- struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
- struct channel *chan;
- while ((chan = str_map_iter_next (&iter)))
- if (!(chan->modes & IRC_CHAN_MODE_SECRET)
- || channel_get_user (chan, c))
- n_channels++;
-
- irc_send_reply (c, IRC_RPL_LUSERCLIENT,
- n_users, n_services, 1 /* servers total */);
- if (n_opers)
- irc_send_reply (c, IRC_RPL_LUSEROP, n_opers);
- if (n_unknown)
- irc_send_reply (c, IRC_RPL_LUSERUNKNOWN, n_unknown);
- if (n_channels)
- irc_send_reply (c, IRC_RPL_LUSERCHANNELS, n_channels);
- irc_send_reply (c, IRC_RPL_LUSERME,
- n_users + n_services + n_unknown, 0 /* peer servers */);
-}
-
-static bool
-irc_is_this_me (struct server_context *ctx, const char *target)
-{
- // Target servers can also be matched by their users
- return !irc_fnmatch (target, ctx->server_name)
- || str_map_find (&ctx->users, target);
-}
-
-static void
-irc_send_isupport (struct client *c)
-{
- // Only # channels, +e supported, +I supported, unlimited arguments to MODE
- irc_send_reply (c, IRC_RPL_ISUPPORT, "CHANTYPES=# EXCEPTS INVEX MODES"
- " TARGMAX=WHOIS:,LIST:,NAMES:,PRIVMSG:1,NOTICE:1,KICK:"
- " NICKLEN=" XSTRINGIFY (IRC_MAX_NICKNAME)
- " CHANNELLEN=" XSTRINGIFY (IRC_MAX_CHANNEL_NAME));
-}
-
-static void
-irc_try_finish_registration (struct client *c)
-{
- struct server_context *ctx = c->ctx;
- if (!c->nickname || !c->username || !c->realname)
- return;
- if (c->registered || c->cap_negotiating)
- return;
-
- c->registered = true;
- irc_send_reply (c, IRC_RPL_WELCOME, c->nickname, c->username, c->hostname);
-
- irc_send_reply (c, IRC_RPL_YOURHOST, ctx->server_name, PROGRAM_VERSION);
- // The purpose of this message eludes me
- irc_send_reply (c, IRC_RPL_CREATED, __DATE__);
- irc_send_reply (c, IRC_RPL_MYINFO, ctx->server_name, PROGRAM_VERSION,
- IRC_SUPPORTED_USER_MODES, IRC_SUPPORTED_CHAN_MODES);
-
- irc_send_isupport (c);
- irc_send_lusers (c);
- irc_send_motd (c);
-
- char *mode = client_get_mode (c);
- if (*mode)
- client_send (c, ":%s MODE %s :+%s", c->nickname, c->nickname, mode);
- free (mode);
-
- hard_assert (c->ssl_cert_fingerprint == NULL);
- if ((c->ssl_cert_fingerprint = client_get_ssl_cert_fingerprint (c)))
- client_send (c, ":%s NOTICE %s :"
- "Your TLS client certificate fingerprint is %s",
- ctx->server_name, c->nickname, c->ssl_cert_fingerprint);
-
- str_map_set (&ctx->whowas, c->nickname, NULL);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-// IRCv3 capability negotiation. See http://ircv3.org for details.
-
-struct irc_cap_args
-{
- const char *subcommand; ///< The subcommand being processed
- const char *full_params; ///< Whole parameter string
- struct strv params; ///< Split parameters
- const char *target; ///< Target parameter for replies
-};
-
-static struct
-{
- unsigned flag; ///< Flag
- const char *name; ///< Name of the capability
-}
-irc_cap_table[] =
-{
- { IRC_CAP_MULTI_PREFIX, "multi-prefix" },
- { IRC_CAP_INVITE_NOTIFY, "invite-notify" },
- { IRC_CAP_ECHO_MESSAGE, "echo-message" },
- { IRC_CAP_USERHOST_IN_NAMES, "userhost-in-names" },
- { IRC_CAP_SERVER_TIME, "server-time" },
-};
-
-static void
-irc_handle_cap_ls (struct client *c, struct irc_cap_args *a)
-{
- if (a->params.len == 1
- && !xstrtoul (&c->cap_version, a->params.vector[0], 10))
- irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
- a->subcommand, "Ignoring invalid protocol version number");
-
- c->cap_negotiating = true;
- client_send (c, ":%s CAP %s LS :multi-prefix invite-notify echo-message"
- " userhost-in-names server-time", c->ctx->server_name, a->target);
-}
-
-static void
-irc_handle_cap_list (struct client *c, struct irc_cap_args *a)
-{
- struct strv caps = strv_make ();
- for (size_t i = 0; i < N_ELEMENTS (irc_cap_table); i++)
- if (c->caps_enabled & irc_cap_table[i].flag)
- strv_append (&caps, irc_cap_table[i].name);
-
- char *caps_str = strv_join (&caps, " ");
- strv_free (&caps);
- client_send (c, ":%s CAP %s LIST :%s",
- c->ctx->server_name, a->target, caps_str);
- free (caps_str);
-}
-
-static unsigned
-irc_decode_capability (const char *name)
-{
- for (size_t i = 0; i < N_ELEMENTS (irc_cap_table); i++)
- if (!strcmp (irc_cap_table[i].name, name))
- return irc_cap_table[i].flag;
- return 0;
-}
-
-static void
-irc_handle_cap_req (struct client *c, struct irc_cap_args *a)
-{
- c->cap_negotiating = true;
-
- unsigned new_caps = c->caps_enabled;
- bool success = true;
- for (size_t i = 0; i < a->params.len; i++)
- {
- bool removing = false;
- const char *name = a->params.vector[i];
- if (*name == '-')
- {
- removing = true;
- name++;
- }
-
- unsigned cap;
- if (!(cap = irc_decode_capability (name)))
- success = false;
- else if (removing)
- new_caps &= ~cap;
- else
- new_caps |= cap;
- }
-
- if (success)
- {
- c->caps_enabled = new_caps;
- client_send (c, ":%s CAP %s ACK :%s",
- c->ctx->server_name, a->target, a->full_params);
- }
- else
- client_send (c, ":%s CAP %s NAK :%s",
- c->ctx->server_name, a->target, a->full_params);
-}
-
-static void
-irc_handle_cap_ack (struct client *c, struct irc_cap_args *a)
-{
- if (a->params.len)
- irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
- a->subcommand, "No acknowledgable capabilities supported");
-}
-
-static void
-irc_handle_cap_end (struct client *c, struct irc_cap_args *a)
-{
- (void) a;
-
- c->cap_negotiating = false;
- irc_try_finish_registration (c);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-struct irc_cap_command
-{
- const char *name;
- void (*handler) (struct client *, struct irc_cap_args *);
-};
-
-static void
-irc_register_cap_handlers (struct server_context *ctx)
-{
- static const struct irc_cap_command cap_handlers[] =
- {
- { "LS", irc_handle_cap_ls },
- { "LIST", irc_handle_cap_list },
- { "REQ", irc_handle_cap_req },
- { "ACK", irc_handle_cap_ack },
- { "END", irc_handle_cap_end },
- };
-
- for (size_t i = 0; i < N_ELEMENTS (cap_handlers); i++)
- {
- const struct irc_cap_command *cmd = &cap_handlers[i];
- str_map_set (&ctx->cap_handlers, cmd->name, (void *) cmd);
- }
-}
-
-static void
-irc_handle_cap (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- struct irc_cap_args args;
- args.target = c->nickname ? c->nickname : "*";
- args.subcommand = msg->params.vector[0];
- args.full_params = "";
- args.params = strv_make ();
-
- if (msg->params.len > 1)
- {
- args.full_params = msg->params.vector[1];
- cstr_split (args.full_params, " ", true, &args.params);
- }
-
- struct irc_cap_command *cmd =
- str_map_find (&c->ctx->cap_handlers, args.subcommand);
- if (!cmd)
- irc_send_reply (c, IRC_ERR_INVALIDCAPCMD,
- args.subcommand, "Invalid CAP subcommand");
- else
- cmd->handler (c, &args);
-
- strv_free (&args.params);
-}
-
-static void
-irc_handle_pass (const struct irc_message *msg, struct client *c)
-{
- if (c->registered)
- irc_send_reply (c, IRC_ERR_ALREADYREGISTERED);
- else if (msg->params.len < 1)
- irc_send_reply (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- // We have TLS client certificates for this purpose; ignoring
-}
-
-static void
-irc_handle_nick (const struct irc_message *msg, struct client *c)
-{
- struct server_context *ctx = c->ctx;
-
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NONICKNAMEGIVEN);
-
- const char *nickname = msg->params.vector[0];
- if (irc_validate_nickname (nickname) != VALIDATION_OK)
- RETURN_WITH_REPLY (c, IRC_ERR_ERRONEOUSNICKNAME, nickname);
-
- struct client *client = str_map_find (&ctx->users, nickname);
- if (client && client != c)
- RETURN_WITH_REPLY (c, IRC_ERR_NICKNAMEINUSE, nickname);
-
- // Nothing to do here, let's not annoy roommates
- if (c->nickname && !strcmp (c->nickname, nickname))
- return;
-
- if (c->registered)
- {
- client_add_to_whowas (c);
-
- char *message = xstrdup_printf (":%s!%s@%s NICK :%s",
- c->nickname, c->username, c->hostname, nickname);
- irc_send_to_roommates (c, message);
- client_send (c, "%s", message);
- free (message);
- }
-
- // Release the old nickname and allocate a new one
- if (c->nickname)
- str_map_set (&ctx->users, c->nickname, NULL);
-
- cstr_set (&c->nickname, xstrdup (nickname));
- str_map_set (&ctx->users, nickname, c);
-
- irc_try_finish_registration (c);
-}
-
-static void
-irc_handle_user (const struct irc_message *msg, struct client *c)
-{
- if (c->registered)
- RETURN_WITH_REPLY (c, IRC_ERR_ALREADYREGISTERED);
- if (msg->params.len < 4)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- const char *username = msg->params.vector[0];
- const char *mode = msg->params.vector[1];
- const char *realname = msg->params.vector[3];
-
- // Unfortunately the protocol doesn't give us any means of rejecting it
- if (!irc_is_valid_user (username))
- username = "xxx";
-
- cstr_set (&c->username, xstrdup (username));
- cstr_set (&c->realname, xstrdup (realname));
- c->mode = 0;
-
- unsigned long m;
- if (xstrtoul (&m, mode, 10))
- {
- if (m & 4) c->mode |= IRC_USER_MODE_RX_WALLOPS;
- if (m & 8) c->mode |= IRC_USER_MODE_INVISIBLE;
- }
-
- irc_try_finish_registration (c);
-}
-
-static void
-irc_handle_userhost (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- struct str reply = str_make ();
- for (size_t i = 0; i < 5 && i < msg->params.len; i++)
- {
- const char *nick = msg->params.vector[i];
- struct client *target = str_map_find (&c->ctx->users, nick);
- if (!target)
- continue;
-
- if (i)
- str_append_c (&reply, ' ');
- str_append (&reply, nick);
- if (target->mode & IRC_USER_MODE_OPERATOR)
- str_append_c (&reply, '*');
- str_append_printf (&reply, "=%c%s@%s",
- target->away_message ? '-' : '+',
- target->username, target->hostname);
- }
- irc_send_reply (c, IRC_RPL_USERHOST, reply.str);
- str_free (&reply);
-}
-
-static void
-irc_handle_lusers (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
- irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
- else
- irc_send_lusers (c);
-}
-
-static void
-irc_handle_motd (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
- irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
- else
- irc_send_motd (c);
-}
-
-static void
-irc_handle_ping (const struct irc_message *msg, struct client *c)
-{
- // XXX: the RFC is pretty incomprehensible about the exact usage
- if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
- irc_send_reply (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
- else if (msg->params.len < 1)
- irc_send_reply (c, IRC_ERR_NOORIGIN);
- else
- client_send (c, ":%s PONG :%s",
- c->ctx->server_name, msg->params.vector[0]);
-}
-
-static void
-irc_handle_pong (const struct irc_message *msg, struct client *c)
-{
- // We are the only server, so we don't have to care too much
- if (msg->params.len < 1)
- irc_send_reply (c, IRC_ERR_NOORIGIN);
- else
- // Set a new timer to send another PING
- client_set_ping_timer (c);
-}
-
-static void
-irc_handle_quit (const struct irc_message *msg, struct client *c)
-{
- char *reason = xstrdup_printf ("Quit: %s",
- msg->params.len > 0 ? msg->params.vector[0] : c->nickname);
- client_close_link (c, reason);
- free (reason);
-}
-
-static void
-irc_handle_time (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
- char buf[32] = "";
- time_t now = time (NULL);
- struct tm tm;
- strftime (buf, sizeof buf, "%a %b %d %Y %T", localtime_r (&now, &tm));
- irc_send_reply (c, IRC_RPL_TIME, c->ctx->server_name, buf);
-}
-
-static void
-irc_handle_version (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
- irc_send_reply (c, IRC_RPL_VERSION, PROGRAM_VERSION, g_debug_mode,
- c->ctx->server_name, PROGRAM_NAME " " PROGRAM_VERSION);
- irc_send_isupport (c);
-}
-
-static void
-irc_channel_multicast (struct channel *chan, const char *message,
- struct client *except)
-{
- for (struct channel_user *iter = chan->users; iter; iter = iter->next)
- if (iter->c != except)
- client_send (iter->c, "%s", message);
-}
-
-static bool
-irc_modify_mode (unsigned *mask, unsigned mode, bool add)
-{
- unsigned orig = *mask;
- if (add)
- *mask |= mode;
- else
- *mask &= ~mode;
- return *mask != orig;
-}
-
-static void
-irc_update_user_mode (struct client *c, unsigned new_mode)
-{
- unsigned old_mode = c->mode;
- c->mode = new_mode;
-
- unsigned added = new_mode & ~old_mode;
- unsigned removed = old_mode & ~new_mode;
-
- struct str diff = str_make ();
- if (added)
- {
- str_append_c (&diff, '+');
- client_mode_to_str (added, &diff);
- }
- if (removed)
- {
- str_append_c (&diff, '-');
- client_mode_to_str (removed, &diff);
- }
-
- if (diff.len)
- client_send (c, ":%s MODE %s :%s",
- c->nickname, c->nickname, diff.str);
- str_free (&diff);
-}
-
-static void
-irc_handle_user_mode_change (struct client *c, const char *mode_string)
-{
- unsigned new_mode = c->mode;
- bool adding = true;
-
- while (*mode_string)
- switch (*mode_string++)
- {
- case '+': adding = true; break;
- case '-': adding = false; break;
-
- case 'a':
- // Ignore, the client should use AWAY
- break;
- case 'i':
- irc_modify_mode (&new_mode, IRC_USER_MODE_INVISIBLE, adding);
- break;
- case 'w':
- irc_modify_mode (&new_mode, IRC_USER_MODE_RX_WALLOPS, adding);
- break;
- case 'r':
- // It's not possible to un-restrict yourself
- if (adding)
- new_mode |= IRC_USER_MODE_RESTRICTED;
- break;
- case 'o':
- if (!adding)
- new_mode &= ~IRC_USER_MODE_OPERATOR;
- else if (c->ssl_cert_fingerprint
- && str_map_find (&c->ctx->operators, c->ssl_cert_fingerprint))
- new_mode |= IRC_USER_MODE_OPERATOR;
- else
- client_send (c, ":%s NOTICE %s :Either you're not using an TLS"
- " client certificate, or the fingerprint doesn't match",
- c->ctx->server_name, c->nickname);
- break;
- case 's':
- irc_modify_mode (&new_mode, IRC_USER_MODE_RX_SERVER_NOTICES, adding);
- break;
- default:
- RETURN_WITH_REPLY (c, IRC_ERR_UMODEUNKNOWNFLAG);
- }
- irc_update_user_mode (c, new_mode);
-}
-
-static void
-irc_send_channel_list (struct client *c, const char *channel_name,
- const struct strv *list, int reply, int end_reply)
-{
- for (size_t i = 0; i < list->len; i++)
- irc_send_reply (c, reply, channel_name, list->vector[i]);
- irc_send_reply (c, end_reply, channel_name);
-}
-
-static char *
-irc_check_expand_user_mask (const char *mask)
-{
- struct str result = str_make ();
- str_append (&result, mask);
-
- // Make sure it is a complete mask
- if (!strchr (result.str, '!'))
- str_append (&result, "!*");
- if (!strchr (result.str, '@'))
- str_append (&result, "@*");
-
- // And validate whatever the result is
- if (!irc_is_valid_user_mask (result.str))
- {
- str_free (&result);
- return NULL;
- }
- return str_steal (&result);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-// Channel MODE command handling. This is by far the worst command to implement
-// from the whole RFC; don't blame me if it doesn't work exactly as expected.
-
-struct mode_processor
-{
- // Inputs to set after initialization:
-
- char **params; ///< Mode string parameters
-
- struct client *c; ///< Who does the changes
- struct channel *channel; ///< The channel we're modifying
- struct channel_user *user; ///< Presence of the client in the chan
-
- // Internals:
-
- bool adding; ///< Currently adding modes
- char mode_char; ///< Currently processed mode char
-
- struct str added; ///< Added modes
- struct str removed; ///< Removed modes
-
- struct strv added_params; ///< Params for added modes
- struct strv removed_params; ///< Params for removed modes
-
- struct str *output; ///< "added" or "removed"
- struct strv *output_params; ///< Similarly for "*_params"
-};
-
-static struct mode_processor
-mode_processor_make (void)
-{
- return (struct mode_processor)
- {
- .added = str_make (), .added_params = strv_make (),
- .removed = str_make (), .removed_params = strv_make (),
- };
-}
-
-static void
-mode_processor_free (struct mode_processor *self)
-{
- str_free (&self->added);
- str_free (&self->removed);
-
- strv_free (&self->added_params);
- strv_free (&self->removed_params);
-}
-
-static const char *
-mode_processor_next_param (struct mode_processor *self)
-{
- if (!*self->params)
- return NULL;
- return *self->params++;
-}
-
-static bool
-mode_processor_check_operator (struct mode_processor *self)
-{
- if ((self->user && (self->user->modes & IRC_CHAN_MODE_OPERATOR))
- || (self->c->mode & IRC_USER_MODE_OPERATOR))
- return true;
-
- irc_send_reply (self->c, IRC_ERR_CHANOPRIVSNEEDED, self->channel->name);
- return false;
-}
-
-static void
-mode_processor_do_user (struct mode_processor *self, int mode)
-{
- const char *target = mode_processor_next_param (self);
- if (!mode_processor_check_operator (self) || !target)
- return;
-
- struct client *client;
- struct channel_user *target_user;
- if (!(client = str_map_find (&self->c->ctx->users, target)))
- irc_send_reply (self->c, IRC_ERR_NOSUCHNICK, target);
- else if (!(target_user = channel_get_user (self->channel, client)))
- irc_send_reply (self->c, IRC_ERR_USERNOTINCHANNEL,
- target, self->channel->name);
- else if (irc_modify_mode (&target_user->modes, mode, self->adding))
- {
- str_append_c (self->output, self->mode_char);
- strv_append (self->output_params, client->nickname);
- }
-}
-
-static bool
-mode_processor_do_chan (struct mode_processor *self, int mode)
-{
- if (!mode_processor_check_operator (self)
- || !irc_modify_mode (&self->channel->modes, mode, self->adding))
- return false;
-
- str_append_c (self->output, self->mode_char);
- return true;
-}
-
-static void
-mode_processor_do_chan_remove
- (struct mode_processor *self, char mode_char, int mode)
-{
- if (self->adding
- && irc_modify_mode (&self->channel->modes, mode, false))
- str_append_c (&self->removed, mode_char);
-}
-
-static void
-mode_processor_do_list (struct mode_processor *self,
- struct strv *list, int list_msg, int end_msg)
-{
- const char *target = mode_processor_next_param (self);
- if (!target)
- {
- if (self->adding)
- irc_send_channel_list (self->c, self->channel->name,
- list, list_msg, end_msg);
- return;
- }
-
- if (!mode_processor_check_operator (self))
- return;
-
- char *mask = irc_check_expand_user_mask (target);
- if (!mask)
- return;
-
- size_t i;
- for (i = 0; i < list->len; i++)
- if (!irc_strcmp (list->vector[i], mask))
- break;
-
- bool found = i != list->len;
- if (found != self->adding)
- {
- if (self->adding)
- strv_append (list, mask);
- else
- strv_remove (list, i);
-
- str_append_c (self->output, self->mode_char);
- strv_append (self->output_params, mask);
- }
- free (mask);
-}
-
-static void
-mode_processor_do_key (struct mode_processor *self)
-{
- const char *target = mode_processor_next_param (self);
- if (!mode_processor_check_operator (self) || !target)
- return;
-
- if (!self->adding)
- {
- if (!self->channel->key || irc_strcmp (target, self->channel->key))
- return;
-
- str_append_c (&self->removed, self->mode_char);
- strv_append (&self->removed_params, self->channel->key);
- cstr_set (&self->channel->key, NULL);
- }
- else if (!irc_is_valid_key (target))
- // TODO: we should notify the user somehow
- return;
- else if (self->channel->key)
- irc_send_reply (self->c, IRC_ERR_KEYSET, self->channel->name);
- else
- {
- self->channel->key = xstrdup (target);
- str_append_c (&self->added, self->mode_char);
- strv_append (&self->added_params, self->channel->key);
- }
-}
-
-static void
-mode_processor_do_limit (struct mode_processor *self)
-{
- if (!mode_processor_check_operator (self))
- return;
-
- const char *target;
- if (!self->adding)
- {
- if (self->channel->user_limit == -1)
- return;
-
- self->channel->user_limit = -1;
- str_append_c (&self->removed, self->mode_char);
- }
- else if ((target = mode_processor_next_param (self)))
- {
- unsigned long x;
- if (xstrtoul (&x, target, 10) && x > 0 && x <= LONG_MAX)
- {
- self->channel->user_limit = x;
- str_append_c (&self->added, self->mode_char);
- strv_append (&self->added_params, target);
- }
- }
-}
-
-static bool
-mode_processor_step (struct mode_processor *self, char mode_char)
-{
- switch ((self->mode_char = mode_char))
- {
- case '+':
- self->adding = true;
- self->output = &self->added;
- self->output_params = &self->added_params;
- break;
- case '-':
- self->adding = false;
- self->output = &self->removed;
- self->output_params = &self->removed_params;
- break;
-
-#define USER(mode) mode_processor_do_user (self, (mode))
-#define CHAN(mode) mode_processor_do_chan (self, (mode))
-
- case 'o': USER (IRC_CHAN_MODE_OPERATOR); break;
- case 'v': USER (IRC_CHAN_MODE_VOICE); break;
-
- case 'i': CHAN (IRC_CHAN_MODE_INVITE_ONLY); break;
- case 'm': CHAN (IRC_CHAN_MODE_MODERATED); break;
- case 'n': CHAN (IRC_CHAN_MODE_NO_OUTSIDE_MSGS); break;
- case 'q': CHAN (IRC_CHAN_MODE_QUIET); break;
- case 't': CHAN (IRC_CHAN_MODE_PROTECTED_TOPIC); break;
-
- case 'p':
- if (CHAN (IRC_CHAN_MODE_PRIVATE))
- mode_processor_do_chan_remove (self, 's', IRC_CHAN_MODE_SECRET);
- break;
- case 's':
- if (CHAN (IRC_CHAN_MODE_SECRET))
- mode_processor_do_chan_remove (self, 'p', IRC_CHAN_MODE_PRIVATE);
- break;
-
-#undef USER
-#undef CHAN
-
- case 'b':
- mode_processor_do_list (self, &self->channel->ban_list,
- IRC_RPL_BANLIST, IRC_RPL_ENDOFBANLIST);
- break;
- case 'e':
- mode_processor_do_list (self, &self->channel->exception_list,
- IRC_RPL_EXCEPTLIST, IRC_RPL_ENDOFEXCEPTLIST);
- break;
- case 'I':
- mode_processor_do_list (self, &self->channel->invite_list,
- IRC_RPL_INVITELIST, IRC_RPL_ENDOFINVITELIST);
- break;
-
- case 'k':
- mode_processor_do_key (self);
- break;
- case 'l':
- mode_processor_do_limit (self);
- break;
-
- default:
- // It's not safe to continue, results could be undesired
- irc_send_reply (self->c, IRC_ERR_UNKNOWNMODE,
- mode_char, self->channel->name);
- return false;
- }
- return true;
-}
-
-static void
-irc_handle_chan_mode_change
- (struct client *c, struct channel *chan, char *params[])
-{
- struct mode_processor p = mode_processor_make ();
- p.params = params;
- p.channel = chan;
- p.c = c;
- p.user = channel_get_user (chan, c);
-
- const char *mode_string;
- while ((mode_string = mode_processor_next_param (&p)))
- {
- mode_processor_step (&p, '+');
- while (*mode_string)
- if (!mode_processor_step (&p, *mode_string++))
- goto done_processing;
- }
-
- // TODO: limit to three changes with parameter per command
-done_processing:
- if (p.added.len || p.removed.len)
- {
- struct str message = str_make ();
- str_append_printf (&message, ":%s!%s@%s MODE %s ",
- p.c->nickname, p.c->username, p.c->hostname,
- p.channel->name);
- if (p.added.len)
- str_append_printf (&message, "+%s", p.added.str);
- if (p.removed.len)
- str_append_printf (&message, "-%s", p.removed.str);
- for (size_t i = 0; i < p.added_params.len; i++)
- str_append_printf (&message, " %s", p.added_params.vector[i]);
- for (size_t i = 0; i < p.removed_params.len; i++)
- str_append_printf (&message, " %s", p.removed_params.vector[i]);
- irc_channel_multicast (p.channel, message.str, NULL);
- str_free (&message);
- }
- mode_processor_free (&p);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void
-irc_handle_mode (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- const char *target = msg->params.vector[0];
- struct client *client = str_map_find (&c->ctx->users, target);
- struct channel *chan = str_map_find (&c->ctx->channels, target);
-
- if (client)
- {
- if (irc_strcmp (target, c->nickname))
- RETURN_WITH_REPLY (c, IRC_ERR_USERSDONTMATCH);
-
- if (msg->params.len < 2)
- {
- char *mode = client_get_mode (client);
- irc_send_reply (c, IRC_RPL_UMODEIS, mode);
- free (mode);
- }
- else
- irc_handle_user_mode_change (c, msg->params.vector[1]);
- }
- else if (chan)
- {
- if (msg->params.len < 2)
- {
- char *mode = channel_get_mode (chan, channel_get_user (chan, c));
- irc_send_reply (c, IRC_RPL_CHANNELMODEIS, target, mode);
- irc_send_reply (c, IRC_RPL_CREATIONTIME,
- target, (long long) chan->created);
- free (mode);
- }
- else
- irc_handle_chan_mode_change (c, chan, &msg->params.vector[1]);
- }
- else
- irc_send_reply (c, IRC_ERR_NOSUCHNICK, target);
-}
-
-static void
-irc_handle_user_message (const struct irc_message *msg, struct client *c,
- const char *command, bool allow_away_reply)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NORECIPIENT, msg->command);
- if (msg->params.len < 2 || !*msg->params.vector[1])
- RETURN_WITH_REPLY (c, IRC_ERR_NOTEXTTOSEND);
-
- const char *target = msg->params.vector[0];
- const char *text = msg->params.vector[1];
- struct client *client = str_map_find (&c->ctx->users, target);
- if (client)
- {
- client_send (client, ":%s!%s@%s %s %s :%s",
- c->nickname, c->username, c->hostname, command, target, text);
- if (allow_away_reply && client->away_message)
- irc_send_reply (c, IRC_RPL_AWAY, target, client->away_message);
-
- // Acknowledging a message from the client to itself would be silly
- if (client != c && (c->caps_enabled & IRC_CAP_ECHO_MESSAGE))
- client_send (c, ":%s!%s@%s %s %s :%s",
- c->nickname, c->username, c->hostname, command, target, text);
- return;
- }
-
- struct channel *chan = str_map_find (&c->ctx->channels, target);
- if (chan)
- {
- struct channel_user *user = channel_get_user (chan, c);
- if ((chan->modes & IRC_CHAN_MODE_NO_OUTSIDE_MSGS) && !user)
- RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
- if ((chan->modes & IRC_CHAN_MODE_MODERATED) && (!user ||
- !(user->modes & (IRC_CHAN_MODE_VOICE | IRC_CHAN_MODE_OPERATOR))))
- RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
- if (client_in_mask_list (c, &chan->ban_list)
- && !client_in_mask_list (c, &chan->exception_list))
- RETURN_WITH_REPLY (c, IRC_ERR_CANNOTSENDTOCHAN, target);
-
- char *message = xstrdup_printf (":%s!%s@%s %s %s :%s",
- c->nickname, c->username, c->hostname, command, target, text);
- irc_channel_multicast (chan, message,
- (c->caps_enabled & IRC_CAP_ECHO_MESSAGE) ? NULL : c);
- free (message);
- return;
- }
-
- irc_send_reply (c, IRC_ERR_NOSUCHNICK, target);
-}
-
-static void
-irc_handle_privmsg (const struct irc_message *msg, struct client *c)
-{
- irc_handle_user_message (msg, c, "PRIVMSG", true);
- // Let's not care too much about success or failure
- c->last_active = time (NULL);
-}
-
-static void
-irc_handle_notice (const struct irc_message *msg, struct client *c)
-{
- irc_handle_user_message (msg, c, "NOTICE", false);
-}
-
-static void
-irc_send_rpl_list (struct client *c, const struct channel *chan)
-{
- int visible = 0;
- for (struct channel_user *user = chan->users;
- user; user = user->next)
- // XXX: maybe we should skip IRC_USER_MODE_INVISIBLE
- visible++;
-
- irc_send_reply (c, IRC_RPL_LIST, chan->name, visible, chan->topic);
-}
-
-static void
-irc_handle_list (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
-
- struct channel *chan;
- if (msg->params.len == 0)
- {
- struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
- while ((chan = str_map_iter_next (&iter)))
- if (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
- || channel_get_user (chan, c))
- irc_send_rpl_list (c, chan);
- }
- else
- {
- struct strv channels = strv_make ();
- cstr_split (msg->params.vector[0], ",", true, &channels);
- for (size_t i = 0; i < channels.len; i++)
- if ((chan = str_map_find (&c->ctx->channels, channels.vector[i]))
- && (!(chan->modes & IRC_CHAN_MODE_SECRET)
- || channel_get_user (chan, c)))
- irc_send_rpl_list (c, chan);
- strv_free (&channels);
- }
- irc_send_reply (c, IRC_RPL_LISTEND);
-}
-
-static void
-irc_append_prefixes (struct client *c, struct channel_user *user,
- struct str *output)
-{
- struct str prefixes = str_make ();
- if (user->modes & IRC_CHAN_MODE_OPERATOR) str_append_c (&prefixes, '@');
- if (user->modes & IRC_CHAN_MODE_VOICE) str_append_c (&prefixes, '+');
-
- if (prefixes.len)
- {
- if (c->caps_enabled & IRC_CAP_MULTI_PREFIX)
- str_append (output, prefixes.str);
- else
- str_append_c (output, prefixes.str[0]);
- }
- str_free (&prefixes);
-}
-
-static char *
-irc_make_rpl_namreply_item
- (struct client *c, struct client *target, struct channel_user *user)
-{
- struct str result = str_make ();
-
- if (user)
- irc_append_prefixes (c, user, &result);
-
- str_append (&result, target->nickname);
- if (c->caps_enabled & IRC_CAP_USERHOST_IN_NAMES)
- str_append_printf (&result,
- "!%s@%s", target->username, target->hostname);
- return str_steal (&result);
-}
-
-static void
-irc_send_rpl_namreply (struct client *c, const struct channel *chan,
- struct str_map *used_nicks)
-{
- char type = '=';
- if (chan->modes & IRC_CHAN_MODE_SECRET)
- type = '@';
- else if (chan->modes & IRC_CHAN_MODE_PRIVATE)
- type = '*';
-
- bool on_channel = channel_get_user (chan, c);
- struct strv nicks = strv_make ();
- for (struct channel_user *iter = chan->users; iter; iter = iter->next)
- {
- if (!on_channel && (iter->c->mode & IRC_USER_MODE_INVISIBLE))
- continue;
- if (used_nicks)
- str_map_set (used_nicks, iter->c->nickname, (void *) 1);
- strv_append_owned (&nicks,
- irc_make_rpl_namreply_item (c, iter->c, iter));
- }
-
- irc_send_reply_vector (c, IRC_RPL_NAMREPLY,
- nicks.vector, type, chan->name, "");
- strv_free (&nicks);
-}
-
-static void
-irc_send_disassociated_names (struct client *c, struct str_map *used)
-{
- struct strv nicks = strv_make ();
- struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
- struct client *target;
- while ((target = str_map_iter_next (&iter)))
- {
- if ((target->mode & IRC_USER_MODE_INVISIBLE)
- || str_map_find (used, target->nickname))
- continue;
- strv_append_owned (&nicks,
- irc_make_rpl_namreply_item (c, target, NULL));
- }
-
- if (nicks.len)
- irc_send_reply_vector (c, IRC_RPL_NAMREPLY,
- nicks.vector, '*', "*", "");
- strv_free (&nicks);
-}
-
-static void
-irc_handle_names (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
-
- struct channel *chan;
- if (msg->params.len == 0)
- {
- struct str_map used = str_map_make (NULL);
- used.key_xfrm = irc_strxfrm;
-
- struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
- while ((chan = str_map_iter_next (&iter)))
- if (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
- || channel_get_user (chan, c))
- irc_send_rpl_namreply (c, chan, &used);
-
- // Also send all visible users we haven't listed yet
- irc_send_disassociated_names (c, &used);
- str_map_free (&used);
-
- irc_send_reply (c, IRC_RPL_ENDOFNAMES, "*");
- }
- else
- {
- struct strv channels = strv_make ();
- cstr_split (msg->params.vector[0], ",", true, &channels);
- for (size_t i = 0; i < channels.len; i++)
- if ((chan = str_map_find (&c->ctx->channels, channels.vector[i]))
- && (!(chan->modes & IRC_CHAN_MODE_SECRET)
- || channel_get_user (chan, c)))
- {
- irc_send_rpl_namreply (c, chan, NULL);
- irc_send_reply (c, IRC_RPL_ENDOFNAMES, channels.vector[i]);
- }
- strv_free (&channels);
- }
-}
-
-static void
-irc_send_rpl_whoreply (struct client *c, const struct channel *chan,
- const struct client *target)
-{
- struct str chars = str_make ();
- str_append_c (&chars, target->away_message ? 'G' : 'H');
- if (target->mode & IRC_USER_MODE_OPERATOR)
- str_append_c (&chars, '*');
-
- struct channel_user *user;
- if (chan && (user = channel_get_user (chan, target)))
- irc_append_prefixes (c, user, &chars);
-
- irc_send_reply (c, IRC_RPL_WHOREPLY, chan ? chan->name : "*",
- target->username, target->hostname, target->ctx->server_name,
- target->nickname, chars.str, 0 /* hop count */, target->realname);
- str_free (&chars);
-}
-
-static void
-irc_match_send_rpl_whoreply (struct client *c, struct client *target,
- const char *mask)
-{
- bool is_roommate = false;
- struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
- struct channel *chan;
- while ((chan = str_map_iter_next (&iter)))
- if (channel_get_user (chan, target) && channel_get_user (chan, c))
- {
- is_roommate = true;
- break;
- }
- if ((target->mode & IRC_USER_MODE_INVISIBLE) && !is_roommate)
- return;
-
- if (irc_fnmatch (mask, target->hostname)
- && irc_fnmatch (mask, target->nickname)
- && irc_fnmatch (mask, target->realname)
- && irc_fnmatch (mask, c->ctx->server_name))
- return;
-
- // Try to find a channel they're on that's visible to us
- struct channel *user_chan = NULL;
- iter = str_map_iter_make (&c->ctx->channels);
- while ((chan = str_map_iter_next (&iter)))
- if (channel_get_user (chan, target)
- && (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
- || channel_get_user (chan, c)))
- {
- user_chan = chan;
- break;
- }
- irc_send_rpl_whoreply (c, user_chan, target);
-}
-
-static void
-irc_handle_who (const struct irc_message *msg, struct client *c)
-{
- bool only_ops = msg->params.len > 1 && !strcmp (msg->params.vector[1], "o");
-
- const char *shown_mask = msg->params.vector[0], *used_mask;
- if (!shown_mask)
- used_mask = shown_mask = "*";
- else if (!strcmp (shown_mask, "0"))
- used_mask = "*";
- else
- used_mask = shown_mask;
-
- struct channel *chan;
- if ((chan = str_map_find (&c->ctx->channels, used_mask)))
- {
- bool on_chan = !!channel_get_user (chan, c);
- if (on_chan || !(chan->modes & IRC_CHAN_MODE_SECRET))
- for (struct channel_user *iter = chan->users;
- iter; iter = iter->next)
- {
- if ((on_chan || !(iter->c->mode & IRC_USER_MODE_INVISIBLE))
- && (!only_ops || (iter->c->mode & IRC_USER_MODE_OPERATOR)))
- irc_send_rpl_whoreply (c, chan, iter->c);
- }
- }
- else
- {
- struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
- struct client *target;
- while ((target = str_map_iter_next (&iter)))
- if (!only_ops || (target->mode & IRC_USER_MODE_OPERATOR))
- irc_match_send_rpl_whoreply (c, target, used_mask);
- }
- irc_send_reply (c, IRC_RPL_ENDOFWHO, shown_mask);
-}
-
-static void
-irc_send_whois_reply (struct client *c, const struct client *target)
-{
- const char *nick = target->nickname;
- irc_send_reply (c, IRC_RPL_WHOISUSER, nick,
- target->username, target->hostname, target->realname);
- irc_send_reply (c, IRC_RPL_WHOISSERVER, nick, target->ctx->server_name,
- str_map_find (&c->ctx->config, "server_info"));
- if (target->mode & IRC_USER_MODE_OPERATOR)
- irc_send_reply (c, IRC_RPL_WHOISOPERATOR, nick);
- irc_send_reply (c, IRC_RPL_WHOISIDLE, nick,
- (int) (time (NULL) - target->last_active));
- if (target->away_message)
- irc_send_reply (c, IRC_RPL_AWAY, nick, target->away_message);
-
- struct strv channels = strv_make ();
-
- struct str_map_iter iter = str_map_iter_make (&c->ctx->channels);
- struct channel *chan;
- struct channel_user *channel_user;
- while ((chan = str_map_iter_next (&iter)))
- if ((channel_user = channel_get_user (chan, target))
- && (!(chan->modes & (IRC_CHAN_MODE_PRIVATE | IRC_CHAN_MODE_SECRET))
- || channel_get_user (chan, c)))
- {
- struct str item = str_make ();
- if (channel_user->modes & IRC_CHAN_MODE_OPERATOR)
- str_append_c (&item, '@');
- else if (channel_user->modes & IRC_CHAN_MODE_VOICE)
- str_append_c (&item, '+');
- str_append (&item, chan->name);
- strv_append_owned (&channels, str_steal (&item));
- }
-
- irc_send_reply_vector (c, IRC_RPL_WHOISCHANNELS, channels.vector, nick, "");
- strv_free (&channels);
-
- irc_send_reply (c, IRC_RPL_ENDOFWHOIS, nick);
-}
-
-static void
-irc_handle_whois (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
- if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
- struct strv masks = strv_make ();
- const char *masks_str = msg->params.vector[msg->params.len > 1];
- cstr_split (masks_str, ",", true, &masks);
- for (size_t i = 0; i < masks.len; i++)
- {
- const char *mask = masks.vector[i];
- struct client *target;
- if (!strpbrk (mask, "*?"))
- {
- if (!(target = str_map_find (&c->ctx->users, mask)))
- irc_send_reply (c, IRC_ERR_NOSUCHNICK, mask);
- else
- irc_send_whois_reply (c, target);
- }
- else
- {
- struct str_map_iter iter = str_map_iter_make (&c->ctx->users);
- bool found = false;
- while ((target = str_map_iter_next (&iter)))
- if (!irc_fnmatch (mask, target->nickname))
- {
- irc_send_whois_reply (c, target);
- found = true;
- }
- if (!found)
- irc_send_reply (c, IRC_ERR_NOSUCHNICK, mask);
- }
- }
- strv_free (&masks);
-}
-
-static void
-irc_handle_whowas (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
- if (msg->params.len > 2 && !irc_is_this_me (c->ctx, msg->params.vector[2]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[2]);
- // The "count" parameter is ignored, we only store one entry for a nick
-
- struct strv nicks = strv_make ();
- cstr_split (msg->params.vector[0], ",", true, &nicks);
-
- for (size_t i = 0; i < nicks.len; i++)
- {
- const char *nick = nicks.vector[i];
- struct whowas_info *info = str_map_find (&c->ctx->whowas, nick);
- if (!info)
- irc_send_reply (c, IRC_ERR_WASNOSUCHNICK, nick);
- else
- {
- irc_send_reply (c, IRC_RPL_WHOWASUSER, nick,
- info->username, info->hostname, info->realname);
- irc_send_reply (c, IRC_RPL_WHOISSERVER, nick, c->ctx->server_name,
- str_map_find (&c->ctx->config, "server_info"));
- }
- irc_send_reply (c, IRC_RPL_ENDOFWHOWAS, nick);
- }
- strv_free (&nicks);
-}
-
-static void
-irc_send_rpl_topic (struct client *c, struct channel *chan)
-{
- if (!*chan->topic)
- irc_send_reply (c, IRC_RPL_NOTOPIC, chan->name);
- else
- {
- irc_send_reply (c, IRC_RPL_TOPIC, chan->name, chan->topic);
- irc_send_reply (c, IRC_RPL_TOPICWHOTIME,
- chan->name, chan->topic_who, (long long) chan->topic_time);
- }
-}
-
-static void
-irc_handle_topic (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- const char *target = msg->params.vector[0];
- struct channel *chan = str_map_find (&c->ctx->channels, target);
- if (!chan)
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, target);
-
- if (msg->params.len < 2)
- {
- irc_send_rpl_topic (c, chan);
- return;
- }
-
- struct channel_user *user = channel_get_user (chan, c);
- if (!user)
- RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, target);
-
- if ((chan->modes & IRC_CHAN_MODE_PROTECTED_TOPIC)
- && !(user->modes & IRC_CHAN_MODE_OPERATOR))
- RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, target);
-
- cstr_set (&chan->topic, xstrdup (msg->params.vector[1]));
- cstr_set (&chan->topic_who, xstrdup_printf
- ("%s!%s@%s", c->nickname, c->username, c->hostname));
- chan->topic_time = time (NULL);
-
- char *message = xstrdup_printf (":%s!%s@%s TOPIC %s :%s",
- c->nickname, c->username, c->hostname, target, chan->topic);
- irc_channel_multicast (chan, message, NULL);
- free (message);
-}
-
-static void
-irc_try_part (struct client *c, const char *channel_name, const char *reason)
-{
- if (!reason)
- reason = c->nickname;
-
- struct channel *chan;
- if (!(chan = str_map_find (&c->ctx->channels, channel_name)))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, channel_name);
-
- struct channel_user *user;
- if (!(user = channel_get_user (chan, c)))
- RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
-
- char *message = xstrdup_printf (":%s!%s@%s PART %s :%s",
- c->nickname, c->username, c->hostname, channel_name, reason);
- if (!(chan->modes & IRC_CHAN_MODE_QUIET))
- irc_channel_multicast (chan, message, NULL);
- else
- client_send (c, "%s", message);
- free (message);
-
- channel_remove_user (chan, user);
- irc_channel_destroy_if_empty (c->ctx, chan);
-}
-
-static void
-irc_part_all_channels (struct client *c)
-{
- // We have to be careful here, the channel might get destroyed
- struct str_map_unset_iter iter =
- str_map_unset_iter_make (&c->ctx->channels);
-
- struct channel *chan;
- while ((chan = str_map_unset_iter_next (&iter)))
- if (channel_get_user (chan, c))
- irc_try_part (c, chan->name, NULL);
- str_map_unset_iter_free (&iter);
-}
-
-static void
-irc_handle_part (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- const char *reason = msg->params.len > 1 ? msg->params.vector[1] : NULL;
- struct strv channels = strv_make ();
- cstr_split (msg->params.vector[0], ",", true, &channels);
- for (size_t i = 0; i < channels.len; i++)
- irc_try_part (c, channels.vector[i], reason);
- strv_free (&channels);
-}
-
-static void
-irc_try_kick (struct client *c, const char *channel_name, const char *nick,
- const char *reason)
-{
- struct channel *chan;
- if (!(chan = str_map_find (&c->ctx->channels, channel_name)))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHCHANNEL, channel_name);
-
- struct channel_user *user;
- if (!(user = channel_get_user (chan, c)))
- RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
- if (!(user->modes & IRC_CHAN_MODE_OPERATOR))
- RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, channel_name);
-
- struct client *client;
- if (!(client = str_map_find (&c->ctx->users, nick))
- || !(user = channel_get_user (chan, client)))
- RETURN_WITH_REPLY (c, IRC_ERR_USERNOTINCHANNEL, nick, channel_name);
-
- char *message = xstrdup_printf (":%s!%s@%s KICK %s %s :%s",
- c->nickname, c->username, c->hostname, channel_name, nick, reason);
- if (!(chan->modes & IRC_CHAN_MODE_QUIET))
- irc_channel_multicast (chan, message, NULL);
- else
- client_send (c, "%s", message);
- free (message);
-
- channel_remove_user (chan, user);
- irc_channel_destroy_if_empty (c->ctx, chan);
-}
-
-static void
-irc_handle_kick (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 2)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- const char *reason = c->nickname;
- if (msg->params.len > 2)
- reason = msg->params.vector[2];
-
- struct strv channels = strv_make ();
- cstr_split (msg->params.vector[0], ",", true, &channels);
- struct strv users = strv_make ();
- cstr_split (msg->params.vector[1], ",", true, &users);
-
- if (channels.len == 1)
- for (size_t i = 0; i < users.len; i++)
- irc_try_kick (c, channels.vector[0], users.vector[i], reason);
- else
- for (size_t i = 0; i < channels.len && i < users.len; i++)
- irc_try_kick (c, channels.vector[i], users.vector[i], reason);
-
- strv_free (&channels);
- strv_free (&users);
-}
-
-static void
-irc_send_invite_notifications
- (struct channel *chan, struct client *c, struct client *target)
-{
- for (struct channel_user *iter = chan->users; iter; iter = iter->next)
- if (iter->c != target && iter->c->caps_enabled & IRC_CAP_INVITE_NOTIFY)
- client_send (iter->c, ":%s!%s@%s INVITE %s %s",
- c->nickname, c->username, c->hostname,
- target->nickname, chan->name);
-}
-
-static void
-irc_handle_invite (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 2)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- const char *target = msg->params.vector[0];
- const char *channel_name = msg->params.vector[1];
-
- struct client *client = str_map_find (&c->ctx->users, target);
- if (!client)
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHNICK, target);
-
- struct channel *chan = str_map_find (&c->ctx->channels, channel_name);
- if (chan)
- {
- struct channel_user *inviting_user;
- if (!(inviting_user = channel_get_user (chan, c)))
- RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
- if (channel_get_user (chan, client))
- RETURN_WITH_REPLY (c, IRC_ERR_USERONCHANNEL, target, channel_name);
-
- if ((inviting_user->modes & IRC_CHAN_MODE_OPERATOR))
- str_map_set (&client->invites, channel_name, (void *) 1);
- else if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY))
- RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, channel_name);
-
- // It's not specified when and how we should send out invite-notify
- if (chan->modes & IRC_CHAN_MODE_INVITE_ONLY)
- irc_send_invite_notifications (chan, c, client);
- }
-
- client_send (client, ":%s!%s@%s INVITE %s %s",
- c->nickname, c->username, c->hostname, client->nickname, channel_name);
- if (client->away_message)
- irc_send_reply (c, IRC_RPL_AWAY,
- client->nickname, client->away_message);
- irc_send_reply (c, IRC_RPL_INVITING, client->nickname, channel_name);
-}
-
-static void
-irc_try_join (struct client *c, const char *channel_name, const char *key)
-{
- struct channel *chan = str_map_find (&c->ctx->channels, channel_name);
- unsigned user_mode = 0;
- if (!chan)
- {
- if (irc_validate_channel_name (channel_name) != VALIDATION_OK)
- RETURN_WITH_REPLY (c, IRC_ERR_BADCHANMASK, channel_name);
- chan = irc_channel_create (c->ctx, channel_name);
- user_mode = IRC_CHAN_MODE_OPERATOR;
- }
- else if (channel_get_user (chan, c))
- return;
-
- bool invited_by_chanop = !!str_map_find (&c->invites, channel_name);
- if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY)
- && !client_in_mask_list (c, &chan->invite_list)
- && !invited_by_chanop)
- RETURN_WITH_REPLY (c, IRC_ERR_INVITEONLYCHAN, channel_name);
- if (chan->key && (!key || strcmp (key, chan->key)))
- RETURN_WITH_REPLY (c, IRC_ERR_BADCHANNELKEY, channel_name);
- if (chan->user_limit != -1
- && channel_user_count (chan) >= (size_t) chan->user_limit)
- RETURN_WITH_REPLY (c, IRC_ERR_CHANNELISFULL, channel_name);
- if (client_in_mask_list (c, &chan->ban_list)
- && !client_in_mask_list (c, &chan->exception_list)
- && !invited_by_chanop)
- RETURN_WITH_REPLY (c, IRC_ERR_BANNEDFROMCHAN, channel_name);
-
- // Destroy any invitation as there's no other way to get rid of it
- str_map_set (&c->invites, channel_name, NULL);
-
- channel_add_user (chan, c)->modes = user_mode;
-
- char *message = xstrdup_printf (":%s!%s@%s JOIN %s",
- c->nickname, c->username, c->hostname, channel_name);
- if (!(chan->modes & IRC_CHAN_MODE_QUIET))
- irc_channel_multicast (chan, message, NULL);
- else
- client_send (c, "%s", message);
- free (message);
-
- irc_send_rpl_topic (c, chan);
- irc_send_rpl_namreply (c, chan, NULL);
- irc_send_reply (c, IRC_RPL_ENDOFNAMES, chan->name);
-}
-
-static void
-irc_handle_join (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- if (!strcmp (msg->params.vector[0], "0"))
- {
- irc_part_all_channels (c);
- return;
- }
-
- struct strv channels = strv_make ();
- cstr_split (msg->params.vector[0], ",", true, &channels);
- struct strv keys = strv_make ();
- if (msg->params.len > 1)
- cstr_split (msg->params.vector[1], ",", true, &keys);
-
- for (size_t i = 0; i < channels.len; i++)
- irc_try_join (c, channels.vector[i],
- i < keys.len ? keys.vector[i] : NULL);
-
- strv_free (&channels);
- strv_free (&keys);
-}
-
-static void
-irc_handle_summon (const struct irc_message *msg, struct client *c)
-{
- (void) msg;
- irc_send_reply (c, IRC_ERR_SUMMONDISABLED);
-}
-
-static void
-irc_handle_users (const struct irc_message *msg, struct client *c)
-{
- (void) msg;
- irc_send_reply (c, IRC_ERR_USERSDISABLED);
-}
-
-static void
-irc_handle_away (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- {
- cstr_set (&c->away_message, NULL);
- irc_send_reply (c, IRC_RPL_UNAWAY);
- }
- else
- {
- cstr_set (&c->away_message, xstrdup (msg->params.vector[0]));
- irc_send_reply (c, IRC_RPL_NOWAWAY);
- }
-}
-
-static void
-irc_handle_ison (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 1)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
-
- struct str result = str_make ();
- const char *nick;
- if (str_map_find (&c->ctx->users, (nick = msg->params.vector[0])))
- str_append (&result, nick);
- for (size_t i = 1; i < msg->params.len; i++)
- if (str_map_find (&c->ctx->users, (nick = msg->params.vector[i])))
- str_append_printf (&result, " %s", nick);
-
- irc_send_reply (c, IRC_RPL_ISON, result.str);
- str_free (&result);
-}
-
-static void
-irc_handle_admin (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 0 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
- irc_send_reply (c, IRC_ERR_NOADMININFO, c->ctx->server_name);
-}
-
-static void
-irc_handle_stats_links (struct client *c, const struct irc_message *msg)
-{
- // There is only an "l" query in RFC 2812 but we cannot link,
- // so instead we provide the "L" query giving information for all users
- const char *filter = NULL;
- if (msg->params.len > 1)
- filter = msg->params.vector[1];
-
- for (struct client *iter = c->ctx->clients; iter; iter = iter->next)
- {
- if (filter && irc_strcmp (iter->nickname, filter))
- continue;
- irc_send_reply (c, IRC_RPL_STATSLINKINFO,
- iter->address, // linkname
- iter->write_buffer.len, // sendq
- iter->n_sent_messages, iter->sent_bytes / 1024,
- iter->n_received_messages, iter->received_bytes / 1024,
- (long long) (time (NULL) - iter->opened));
- }
-}
-
-static void
-irc_handle_stats_commands (struct client *c)
-{
- struct str_map_iter iter = str_map_iter_make (&c->ctx->handlers);
- struct irc_command *handler;
- while ((handler = str_map_iter_next (&iter)))
- {
- if (!handler->n_received)
- continue;
- irc_send_reply (c, IRC_RPL_STATSCOMMANDS, handler->name,
- handler->n_received, handler->bytes_received, (size_t) 0);
- }
-}
-
-static void
-irc_handle_stats_uptime (struct client *c)
-{
- time_t uptime = time (NULL) - c->ctx->started;
-
- int days = uptime / 60 / 60 / 24;
- int hours = (uptime % (60 * 60 * 24)) / 60 / 60;
- int mins = (uptime % (60 * 60)) / 60;
- int secs = uptime % 60;
-
- irc_send_reply (c, IRC_RPL_STATSUPTIME, days, hours, mins, secs);
-}
-
-static void
-irc_handle_stats (const struct irc_message *msg, struct client *c)
-{
- char query = 0;
- if (msg->params.len > 0)
- query = *msg->params.vector[0];
- if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[1]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[1]);
- if (!(c->mode & IRC_USER_MODE_OPERATOR))
- RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
-
- switch (query)
- {
- case 'L': irc_handle_stats_links (c, msg); break;
- case 'm': irc_handle_stats_commands (c); break;
- case 'u': irc_handle_stats_uptime (c); break;
- }
-
- irc_send_reply (c, IRC_RPL_ENDOFSTATS, query ? query : '*');
-}
-
-static void
-irc_handle_links (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len > 1 && !irc_is_this_me (c->ctx, msg->params.vector[0]))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHSERVER, msg->params.vector[0]);
-
- const char *mask = "*";
- if (msg->params.len > 0)
- mask = msg->params.vector[msg->params.len > 1];
-
- if (!irc_fnmatch (mask, c->ctx->server_name))
- irc_send_reply (c, IRC_RPL_LINKS, mask,
- c->ctx->server_name, 0 /* hop count */,
- str_map_find (&c->ctx->config, "server_info"));
- irc_send_reply (c, IRC_RPL_ENDOFLINKS, mask);
-}
-
-static void
-irc_handle_kill (const struct irc_message *msg, struct client *c)
-{
- if (msg->params.len < 2)
- RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
- if (!(c->mode & IRC_USER_MODE_OPERATOR))
- RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
-
- struct client *target;
- if (!(target = str_map_find (&c->ctx->users, msg->params.vector[0])))
- RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHNICK, msg->params.vector[0]);
-
- client_send (target, ":%s!%s@%s KILL %s :%s",
- c->nickname, c->username, c->hostname,
- target->nickname, msg->params.vector[1]);
-
- char *reason = xstrdup_printf ("Killed by %s: %s",
- c->nickname, msg->params.vector[1]);
- client_close_link (target, reason);
- free (reason);
-}
-
-static void
-irc_handle_die (const struct irc_message *msg, struct client *c)
-{
- (void) msg;
-
- if (!(c->mode & IRC_USER_MODE_OPERATOR))
- RETURN_WITH_REPLY (c, IRC_ERR_NOPRIVILEGES);
- if (!c->ctx->quitting)
- irc_initiate_quit (c->ctx);
-}
-
-// -----------------------------------------------------------------------------
-
-static void
-irc_register_handlers (struct server_context *ctx)
-{
- // TODO: add an index for IRC_ERR_NOSUCHSERVER validation?
- // TODO: add a minimal parameter count?
- // TODO: add a field for oper-only commands?
- static struct irc_command message_handlers[] =
- {
- { "CAP", false, irc_handle_cap, 0, 0 },
- { "PASS", false, irc_handle_pass, 0, 0 },
- { "NICK", false, irc_handle_nick, 0, 0 },
- { "USER", false, irc_handle_user, 0, 0 },
-
- { "USERHOST", true, irc_handle_userhost, 0, 0 },
- { "LUSERS", true, irc_handle_lusers, 0, 0 },
- { "MOTD", true, irc_handle_motd, 0, 0 },
- { "PING", true, irc_handle_ping, 0, 0 },
- { "PONG", false, irc_handle_pong, 0, 0 },
- { "QUIT", false, irc_handle_quit, 0, 0 },
- { "TIME", true, irc_handle_time, 0, 0 },
- { "VERSION", true, irc_handle_version, 0, 0 },
- { "USERS", true, irc_handle_users, 0, 0 },
- { "SUMMON", true, irc_handle_summon, 0, 0 },
- { "AWAY", true, irc_handle_away, 0, 0 },
- { "ADMIN", true, irc_handle_admin, 0, 0 },
- { "STATS", true, irc_handle_stats, 0, 0 },
- { "LINKS", true, irc_handle_links, 0, 0 },
-
- { "MODE", true, irc_handle_mode, 0, 0 },
- { "PRIVMSG", true, irc_handle_privmsg, 0, 0 },
- { "NOTICE", true, irc_handle_notice, 0, 0 },
- { "JOIN", true, irc_handle_join, 0, 0 },
- { "PART", true, irc_handle_part, 0, 0 },
- { "KICK", true, irc_handle_kick, 0, 0 },
- { "INVITE", true, irc_handle_invite, 0, 0 },
- { "TOPIC", true, irc_handle_topic, 0, 0 },
- { "LIST", true, irc_handle_list, 0, 0 },
- { "NAMES", true, irc_handle_names, 0, 0 },
- { "WHO", true, irc_handle_who, 0, 0 },
- { "WHOIS", true, irc_handle_whois, 0, 0 },
- { "WHOWAS", true, irc_handle_whowas, 0, 0 },
- { "ISON", true, irc_handle_ison, 0, 0 },
-
- { "KILL", true, irc_handle_kill, 0, 0 },
- { "DIE", true, irc_handle_die, 0, 0 },
- };
-
- for (size_t i = 0; i < N_ELEMENTS (message_handlers); i++)
- {
- const struct irc_command *cmd = &message_handlers[i];
- str_map_set (&ctx->handlers, cmd->name, (void *) cmd);
- }
-}
-
-static void
-irc_process_message (const struct irc_message *msg,
- const char *raw, void *user_data)
-{
- struct client *c = user_data;
- if (c->closing_link)
- return;
-
- c->n_received_messages++;
- c->received_bytes += strlen (raw) + 2;
-
- if (!flood_detector_check (&c->antiflood))
- {
- client_close_link (c, "Excess flood");
- return;
- }
-
- struct irc_command *cmd = str_map_find (&c->ctx->handlers, msg->command);
- if (!cmd)
- irc_send_reply (c, IRC_ERR_UNKNOWNCOMMAND, msg->command);
- else
- {
- cmd->n_received++;
- cmd->bytes_received += strlen (raw) + 2;
-
- if (cmd->requires_registration && !c->registered)
- irc_send_reply (c, IRC_ERR_NOTREGISTERED);
- else
- cmd->handler (msg, c);
- }
-}
-
-// --- Network I/O -------------------------------------------------------------
-
-static bool
-irc_try_read (struct client *c)
-{
- struct str *buf = &c->read_buffer;
- ssize_t n_read;
-
- while (true)
- {
- str_reserve (buf, 512);
- n_read = read (c->socket_fd, buf->str + buf->len,
- buf->alloc - buf->len - 1 /* null byte */);
-
- if (n_read > 0)
- {
- buf->str[buf->len += n_read] = '\0';
- // TODO: discard characters above the 512 character limit
- irc_process_buffer (buf, irc_process_message, c);
- continue;
- }
- if (n_read == 0)
- {
- client_kill (c, NULL);
- return false;
- }
-
- if (errno == EAGAIN)
- return true;
- if (errno == EINTR)
- continue;
-
- print_debug ("%s: %s: %s", __func__, "read", strerror (errno));
- client_kill (c, strerror (errno));
- return false;
- }
-}
-
-static bool
-irc_try_read_tls (struct client *c)
-{
- if (c->ssl_tx_want_rx)
- return true;
-
- struct str *buf = &c->read_buffer;
- c->ssl_rx_want_tx = false;
- while (true)
- {
- str_reserve (buf, 512);
- ERR_clear_error ();
- int n_read = SSL_read (c->ssl, buf->str + buf->len,
- buf->alloc - buf->len - 1 /* null byte */);
-
- const char *error_info = NULL;
- switch (xssl_get_error (c->ssl, n_read, &error_info))
- {
- case SSL_ERROR_NONE:
- buf->str[buf->len += n_read] = '\0';
- // TODO: discard characters above the 512 character limit
- irc_process_buffer (buf, irc_process_message, c);
- continue;
- case SSL_ERROR_ZERO_RETURN:
- client_kill (c, NULL);
- return false;
- case SSL_ERROR_WANT_READ:
- return true;
- case SSL_ERROR_WANT_WRITE:
- c->ssl_rx_want_tx = true;
- return true;
- case XSSL_ERROR_TRY_AGAIN:
- continue;
- default:
- print_debug ("%s: %s: %s", __func__, "SSL_read", error_info);
- client_kill (c, error_info);
- return false;
- }
- }
-}
-
-static bool
-irc_try_write (struct client *c)
-{
- struct str *buf = &c->write_buffer;
- ssize_t n_written;
-
- while (buf->len)
- {
- n_written = write (c->socket_fd, buf->str, buf->len);
- if (n_written >= 0)
- {
- str_remove_slice (buf, 0, n_written);
- continue;
- }
-
- if (errno == EAGAIN)
- return true;
- if (errno == EINTR)
- continue;
-
- print_debug ("%s: %s: %s", __func__, "write", strerror (errno));
- client_kill (c, strerror (errno));
- return false;
- }
- return true;
-}
-
-static bool
-irc_try_write_tls (struct client *c)
-{
- if (c->ssl_rx_want_tx)
- return true;
-
- struct str *buf = &c->write_buffer;
- c->ssl_tx_want_rx = false;
- while (buf->len)
- {
- ERR_clear_error ();
- int n_written = SSL_write (c->ssl, buf->str, buf->len);
-
- const char *error_info = NULL;
- switch (xssl_get_error (c->ssl, n_written, &error_info))
- {
- case SSL_ERROR_NONE:
- str_remove_slice (buf, 0, n_written);
- continue;
- case SSL_ERROR_ZERO_RETURN:
- client_kill (c, NULL);
- return false;
- case SSL_ERROR_WANT_WRITE:
- return true;
- case SSL_ERROR_WANT_READ:
- c->ssl_tx_want_rx = true;
- return true;
- case XSSL_ERROR_TRY_AGAIN:
- continue;
- default:
- print_debug ("%s: %s: %s", __func__, "SSL_write", error_info);
- client_kill (c, error_info);
- return false;
- }
- }
- return true;
-}
-
-// -----------------------------------------------------------------------------
-
-static bool
-irc_autodetect_tls (struct client *c)
-{
- // Trivial SSL/TLS autodetection. The first block of data returned by
- // recv() must be at least three bytes long for this to work reliably,
- // but that should not pose a problem in practice.
- //
- // SSL2: 1xxx xxxx | xxxx xxxx | <1>
- // (message length) (client hello)
- // SSL3/TLS: <22> | <3> | xxxx xxxx
- // (handshake)| (protocol version)
- //
- // Such byte sequences should never occur at the beginning of regular IRC
- // communication, which usually begins with USER/NICK/PASS/SERVICE.
-
- char buf[3];
-start:
- switch (recv (c->socket_fd, buf, sizeof buf, MSG_PEEK))
- {
- case 3:
- if ((buf[0] & 0x80) && buf[2] == 1)
- return true;
- // Fall-through
- case 2:
- if (buf[0] == 22 && buf[1] == 3)
- return true;
- break;
- case 1:
- if (buf[0] == 22)
- return true;
- break;
- case 0:
- break;
- default:
- if (errno == EINTR)
- goto start;
- }
- return false;
-}
-
-static bool
-client_initialize_tls (struct client *c)
-{
- const char *error_info = NULL;
- if (!c->ctx->ssl_ctx)
- {
- error_info = "TLS support disabled";
- goto error_ssl_1;
- }
-
- ERR_clear_error ();
-
- c->ssl = SSL_new (c->ctx->ssl_ctx);
- if (!c->ssl)
- goto error_ssl_2;
- if (!SSL_set_fd (c->ssl, c->socket_fd))
- goto error_ssl_3;
-
- SSL_set_accept_state (c->ssl);
- return true;
-
-error_ssl_3:
- SSL_free (c->ssl);
- c->ssl = NULL;
-error_ssl_2:
- error_info = xerr_describe_error ();
-error_ssl_1:
- print_debug ("could not initialize TLS for %s: %s", c->address, error_info);
- return false;
-}
-
-// -----------------------------------------------------------------------------
-
-static void
-on_client_ready (const struct pollfd *pfd, void *user_data)
-{
- struct client *c = user_data;
- if (!c->initialized)
- {
- hard_assert (pfd->events == POLLIN);
- if (irc_autodetect_tls (c) && !client_initialize_tls (c))
- {
- client_kill (c, NULL);
- return;
- }
- c->initialized = true;
- client_set_ping_timer (c);
- }
-
- if (c->ssl)
- {
- // Reads may want to write, writes may want to read, poll() may
- // return unexpected things in `revents'... let's try both
- if (!irc_try_read_tls (c) || !irc_try_write_tls (c))
- return;
- }
- else if (!irc_try_read (c) || !irc_try_write (c))
- return;
-
- client_update_poller (c, pfd);
-
- // The purpose of the `closing_link' state is to transfer the `ERROR'
- if (c->closing_link && !c->half_closed && !c->write_buffer.len)
- {
- // To make sure the client has received our ERROR message, we must
- // first half-close the connection, otherwise it could happen that they
- // receive a RST from our TCP stack first when we receive further data
-
- // We only send the "close notify" alert if libssl can write to the
- // socket at this moment. All the other data has been already written,
- // though, and the client will receive a TCP half-close as usual, so
- // it's not that important if the alert actually gets through.
- if (c->ssl)
- (void) SSL_shutdown (c->ssl);
-
- // Either the shutdown succeeds, in which case we set a flag so that
- // we don't retry this action and wait until we get an EOF, or it fails
- // and we just kill the client straight away
- if (!shutdown (c->socket_fd, SHUT_WR))
- c->half_closed = true;
- else
- client_kill (c, NULL);
- }
-}
-
-static void
-client_update_poller (struct client *c, const struct pollfd *pfd)
-{
- // We must not poll for writing when the connection hasn't been initialized
- int new_events = POLLIN;
- if (c->ssl)
- {
- if (c->write_buffer.len || c->ssl_rx_want_tx)
- new_events |= POLLOUT;
-
- // While we're waiting for an opposite event, we ignore the original
- if (c->ssl_rx_want_tx) new_events &= ~POLLIN;
- if (c->ssl_tx_want_rx) new_events &= ~POLLOUT;
- }
- else if (c->initialized && c->write_buffer.len)
- new_events |= POLLOUT;
-
- hard_assert (new_events != 0);
- if (!pfd || pfd->events != new_events)
- poller_fd_set (&c->socket_event, new_events);
-}
-
-static void
-client_finish_connection (struct client *c)
-{
- c->gni = NULL;
-
- c->address = format_host_port_pair (c->hostname, c->port);
- print_debug ("accepted connection from %s", c->address);
-
- client_update_poller (c, NULL);
- client_set_kill_timer (c);
-}
-
-static void
-on_client_gni_resolved (int result, char *host, char *port, void *user_data)
-{
- struct client *c = user_data;
-
- if (result)
- print_debug ("%s: %s", "getnameinfo", gai_strerror (result));
- else
- {
- cstr_set (&c->hostname, xstrdup (host));
- (void) port;
- }
-
- poller_timer_reset (&c->gni_timer);
- client_finish_connection (c);
-}
-
-static void
-on_client_gni_timer (struct client *c)
-{
- async_cancel (&c->gni->async);
- client_finish_connection (c);
-}
-
-static bool
-irc_try_fetch_client (struct server_context *ctx, int listen_fd)
-{
- // XXX: `struct sockaddr_storage' is not the most portable thing
- struct sockaddr_storage peer;
- socklen_t peer_len = sizeof peer;
-
- int fd = accept (listen_fd, (struct sockaddr *) &peer, &peer_len);
- if (fd == -1)
- {
- if (errno == EAGAIN || errno == EWOULDBLOCK)
- return false;
- if (errno == EINTR)
- return true;
-
- if (errno == EBADF
- || errno == EINVAL
- || errno == ENOTSOCK
- || errno == EOPNOTSUPP)
- print_fatal ("%s: %s", "accept", strerror (errno));
-
- // OS kernels may return a wide range of unforeseeable errors.
- // Assuming that they're either transient or caused by
- // a connection that we've just extracted from the queue.
- print_warning ("%s: %s", "accept", strerror (errno));
- return true;
- }
-
- hard_assert (peer_len <= sizeof peer);
- set_blocking (fd, false);
-
- // A little bit questionable once the traffic gets high enough (IMO),
- // but it reduces silly latencies that we don't need because we already
- // do buffer our output
- int yes = 1;
- soft_assert (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY,
- &yes, sizeof yes) != -1);
-
- if (ctx->max_connections != 0 && ctx->n_clients >= ctx->max_connections)
- {
- print_debug ("connection limit reached, refusing connection");
- close (fd);
- return true;
- }
-
- char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown";
- int err = getnameinfo ((struct sockaddr *) &peer, peer_len,
- host, sizeof host, port, sizeof port, NI_NUMERICHOST | NI_NUMERICSERV);
- if (err)
- print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
-
- struct client *c = client_new ();
- c->ctx = ctx;
- c->opened = time (NULL);
- c->socket_fd = fd;
- c->hostname = xstrdup (host);
- c->port = xstrdup (port);
- c->last_active = time (NULL);
- LIST_PREPEND (ctx->clients, c);
- ctx->n_clients++;
-
- c->socket_event = poller_fd_make (&c->ctx->poller, c->socket_fd);
- c->socket_event.dispatcher = (poller_fd_fn) on_client_ready;
- c->socket_event.user_data = c;
-
- c->kill_timer = poller_timer_make (&c->ctx->poller);
- c->kill_timer.dispatcher = (poller_timer_fn) on_client_kill_timer;
- c->kill_timer.user_data = c;
-
- c->timeout_timer = poller_timer_make (&c->ctx->poller);
- c->timeout_timer.dispatcher = (poller_timer_fn) on_client_timeout_timer;
- c->timeout_timer.user_data = c;
-
- c->ping_timer = poller_timer_make (&c->ctx->poller);
- c->ping_timer.dispatcher = (poller_timer_fn) on_client_ping_timer;
- c->ping_timer.user_data = c;
-
- // Resolve the client's hostname first; this is a blocking operation that
- // depends on the network, so run it asynchronously with some timeout
- c->gni = async_getnameinfo (&ctx->poller.common.async,
- (const struct sockaddr *) &peer, peer_len, NI_NUMERICSERV);
- c->gni->dispatcher = on_client_gni_resolved;
- c->gni->user_data = c;
-
- c->gni_timer = poller_timer_make (&c->ctx->poller);
- c->gni_timer.dispatcher = (poller_timer_fn) on_client_gni_timer;
- c->gni_timer.user_data = c;
-
- poller_timer_set (&c->gni_timer, 5000);
- return true;
-}
-
-static void
-on_irc_client_available (const struct pollfd *pfd, void *user_data)
-{
- struct server_context *ctx = user_data;
- while (irc_try_fetch_client (ctx, pfd->fd))
- ;
-}
-
-// --- Application setup -------------------------------------------------------
-
-static int
-irc_ssl_verify_callback (int verify_ok, X509_STORE_CTX *ctx)
-{
- (void) verify_ok;
- (void) ctx;
-
- // RFC 5246: "If the client has sent a certificate with signing ability,
- // a digitally-signed CertificateVerify message is sent to explicitly
- // verify possession of the private key in the certificate."
- //
- // The handshake will fail if the client doesn't have a matching private
- // key, see OpenSSL's tls_process_cert_verify(), and the CertificateVerify
- // message cannot be skipped (except for a case where it doesn't matter).
- // Thus we're fine checking just the cryptographic hash of the certificate.
-
- // We only want to provide additional privileges based on the client's
- // certificate, so let's not terminate the connection because of a failure
- // (especially since self-signed certificates are likely to be used).
- return 1;
-}
-
-static void
-irc_ssl_info_callback (const SSL *ssl, int where, int ret)
-{
- // For debugging only; provides us with the most important information
-
- struct str s = str_make ();
- if (where & SSL_CB_LOOP)
- str_append_printf (&s, "loop (%s) ",
- SSL_state_string_long (ssl));
- if (where & SSL_CB_EXIT)
- str_append_printf (&s, "exit (%d in %s) ", ret,
- SSL_state_string_long (ssl));
-
- if (where & SSL_CB_READ) str_append (&s, "read ");
- if (where & SSL_CB_WRITE) str_append (&s, "write ");
-
- if (where & SSL_CB_ALERT)
- str_append_printf (&s, "alert (%s: %s) ",
- SSL_alert_type_string_long (ret),
- SSL_alert_desc_string_long (ret));
-
- if (where & SSL_CB_HANDSHAKE_START) str_append (&s, "handshake start ");
- if (where & SSL_CB_HANDSHAKE_DONE) str_append (&s, "handshake done ");
-
- print_debug ("ssl <%p> %s", ssl, s.str);
- str_free (&s);
-}
-
-static bool
-irc_initialize_ssl_ctx (struct server_context *ctx,
- const char *cert_path, const char *key_path, struct error **e)
-{
- ERR_clear_error ();
-
- ctx->ssl_ctx = SSL_CTX_new (SSLv23_server_method ());
- if (!ctx->ssl_ctx)
- {
- error_set (e, "%s: %s", "could not initialize TLS",
- xerr_describe_error ());
- return false;
- }
- SSL_CTX_set_verify (ctx->ssl_ctx,
- SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, irc_ssl_verify_callback);
-
- if (g_debug_mode)
- SSL_CTX_set_info_callback (ctx->ssl_ctx, irc_ssl_info_callback);
-
- const unsigned char session_id_context[SSL_MAX_SSL_SESSION_ID_LENGTH]
- = PROGRAM_NAME;
- (void) SSL_CTX_set_session_id_context (ctx->ssl_ctx,
- session_id_context, sizeof session_id_context);
-
- // IRC is not particularly reconnect-heavy, prefer forward secrecy
- SSL_CTX_set_session_cache_mode (ctx->ssl_ctx, SSL_SESS_CACHE_OFF);
-
- // Gah, spare me your awkward semantics, I just want to push data!
- SSL_CTX_set_mode (ctx->ssl_ctx,
- SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
-
- // Disable deprecated protocols (see RFC 7568)
- SSL_CTX_set_options (ctx->ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
-
- // XXX: perhaps we should read the files ourselves for better messages
- const char *ciphers = str_map_find (&ctx->config, "tls_ciphers");
- if (!SSL_CTX_set_cipher_list (ctx->ssl_ctx, ciphers))
- error_set (e, "failed to select any cipher from the cipher list");
- else if (!SSL_CTX_use_certificate_chain_file (ctx->ssl_ctx, cert_path))
- error_set (e, "%s: %s", "setting the TLS certificate failed",
- xerr_describe_error ());
- else if (!SSL_CTX_use_PrivateKey_file
- (ctx->ssl_ctx, key_path, SSL_FILETYPE_PEM))
- error_set (e, "%s: %s", "setting the TLS private key failed",
- xerr_describe_error ());
- else
- // TODO: SSL_CTX_check_private_key()? It has probably already been
- // checked by SSL_CTX_use_PrivateKey_file() above.
- return true;
-
- SSL_CTX_free (ctx->ssl_ctx);
- ctx->ssl_ctx = NULL;
- return false;
-}
-
-static bool
-irc_initialize_tls (struct server_context *ctx, struct error **e)
-{
- const char *tls_cert = str_map_find (&ctx->config, "tls_cert");
- const char *tls_key = str_map_find (&ctx->config, "tls_key");
-
- // Only try to enable SSL support if the user configures it; it is not
- // a failure if no one has requested it.
- if (!tls_cert && !tls_key)
- return true;
-
- if (!tls_cert)
- error_set (e, "no TLS certificate set");
- else if (!tls_key)
- error_set (e, "no TLS private key set");
- if (!tls_cert || !tls_key)
- return false;
-
- bool result = false;
-
- char *cert_path = resolve_filename
- (tls_cert, resolve_relative_config_filename);
- char *key_path = resolve_filename
- (tls_key, resolve_relative_config_filename);
- if (!cert_path)
- error_set (e, "%s: %s", "cannot open file", tls_cert);
- else if (!key_path)
- error_set (e, "%s: %s", "cannot open file", tls_key);
- else
- result = irc_initialize_ssl_ctx (ctx, cert_path, key_path, e);
-
- free (cert_path);
- free (key_path);
- return result;
-}
-
-static bool
-irc_initialize_catalog (struct server_context *ctx, struct error **e)
-{
- hard_assert (ctx->catalog == (nl_catd) -1);
- const char *catalog = str_map_find (&ctx->config, "catalog");
- if (!catalog)
- return true;
-
- char *path = resolve_filename (catalog, resolve_relative_config_filename);
- if (!path)
- {
- error_set (e, "%s: %s", "cannot open file", catalog);
- return false;
- }
- ctx->catalog = catopen (path, NL_CAT_LOCALE);
- free (path);
-
- if (ctx->catalog == (nl_catd) -1)
- {
- error_set (e, "%s: %s",
- "failed reading the message catalog file", strerror (errno));
- return false;
- }
- return true;
-}
-
-static bool
-irc_initialize_motd (struct server_context *ctx, struct error **e)
-{
- hard_assert (ctx->motd.len == 0);
- const char *motd = str_map_find (&ctx->config, "motd");
- if (!motd)
- return true;
-
- char *path = resolve_filename (motd, resolve_relative_config_filename);
- if (!path)
- {
- error_set (e, "%s: %s", "cannot open file", motd);
- return false;
- }
- FILE *fp = fopen (path, "r");
- free (path);
-
- if (!fp)
- {
- error_set (e, "%s: %s",
- "failed reading the MOTD file", strerror (errno));
- return false;
- }
-
- struct str line = str_make ();
- while (read_line (fp, &line))
- strv_append_owned (&ctx->motd, str_steal (&line));
- str_free (&line);
-
- fclose (fp);
- return true;
-}
-
-static bool
-irc_parse_config_unsigned (const char *name, const char *value, unsigned *out,
- unsigned long min, unsigned long max, struct error **e)
-{
- unsigned long ul;
- hard_assert (value != NULL);
- if (!xstrtoul (&ul, value, 10) || ul > max || ul < min)
- {
- error_set (e, "invalid configuration value for `%s': %s",
- name, "the number is invalid or out of range");
- return false;
- }
- *out = ul;
- return true;
-}
-
-/// This function handles values that require validation before their first use,
-/// or some kind of a transformation (such as conversion to an integer) needs
-/// to be done before they can be used directly.
-static bool
-irc_parse_config (struct server_context *ctx, struct error **e)
-{
-#define PARSE_UNSIGNED(name, min, max) \
- irc_parse_config_unsigned (#name, str_map_find (&ctx->config, #name), \
- &ctx->name, min, max, e)
-
- if (!PARSE_UNSIGNED (ping_interval, 1, UINT_MAX)
- || !PARSE_UNSIGNED (max_connections, 0, UINT_MAX))
- return false;
-
- bool result = true;
- struct strv fingerprints = strv_make ();
- const char *operators = str_map_find (&ctx->config, "operators");
- if (operators)
- cstr_split (operators, ",", true, &fingerprints);
- for (size_t i = 0; i < fingerprints.len; i++)
- {
- const char *key = fingerprints.vector[i];
- if (!irc_is_valid_fingerprint (key))
- {
- error_set (e, "invalid configuration value for `%s': %s",
- "operators", "invalid fingerprint value");
- result = false;
- break;
- }
- str_map_set (&ctx->operators, key, (void *) 1);
- }
- strv_free (&fingerprints);
- return result;
-}
-
-static bool
-irc_initialize_server_name (struct server_context *ctx, struct error **e)
-{
- enum validation_result res;
- const char *server_name = str_map_find (&ctx->config, "server_name");
- if (server_name)
- {
- res = irc_validate_hostname (server_name);
- if (res != VALIDATION_OK)
- {
- error_set (e, "invalid configuration value for `%s': %s",
- "server_name", irc_validate_to_str (res));
- return false;
- }
- ctx->server_name = xstrdup (server_name);
- }
- else
- {
- long host_name_max = sysconf (_SC_HOST_NAME_MAX);
- if (host_name_max <= 0)
- host_name_max = _POSIX_HOST_NAME_MAX;
-
- char hostname[host_name_max + 1];
- if (gethostname (hostname, sizeof hostname))
- {
- error_set (e, "%s: %s",
- "getting the hostname failed", strerror (errno));
- return false;
- }
- res = irc_validate_hostname (hostname);
- if (res != VALIDATION_OK)
- {
- error_set (e,
- "`%s' is not set and the hostname (`%s') cannot be used: %s",
- "server_name", hostname, irc_validate_to_str (res));
- return false;
- }
- ctx->server_name = xstrdup (hostname);
- }
- return true;
-}
-
-static bool
-irc_lock_pid_file (struct server_context *ctx, struct error **e)
-{
- const char *path = str_map_find (&ctx->config, "pid_file");
- if (!path)
- return true;
-
- char *resolved = resolve_filename (path, resolve_relative_runtime_filename);
- bool result = lock_pid_file (resolved, e) != -1;
- free (resolved);
- return result;
-}
-
-static int
-irc_listen (struct addrinfo *gai_iter)
-{
- int fd = socket (gai_iter->ai_family,
- gai_iter->ai_socktype, gai_iter->ai_protocol);
- if (fd == -1)
- return -1;
- set_cloexec (fd);
-
- int yes = 1;
- soft_assert (setsockopt (fd, SOL_SOCKET, SO_KEEPALIVE,
- &yes, sizeof yes) != -1);
- soft_assert (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
- &yes, sizeof yes) != -1);
-
-#if defined SOL_IPV6 && defined IPV6_V6ONLY
- // Make NULL always bind to both IPv4 and IPv6, irrespectively of the order
- // of results; only INADDR6_ANY seems to be affected by this
- if (gai_iter->ai_family == AF_INET6)
- soft_assert (setsockopt (fd, SOL_IPV6, IPV6_V6ONLY,
- &yes, sizeof yes) != -1);
-#endif
-
- char host[NI_MAXHOST], port[NI_MAXSERV];
- host[0] = port[0] = '\0';
- int err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen,
- host, sizeof host, port, sizeof port,
- NI_NUMERICHOST | NI_NUMERICSERV);
- if (err)
- print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
-
- char *address = format_host_port_pair (host, port);
- if (bind (fd, gai_iter->ai_addr, gai_iter->ai_addrlen))
- print_error ("bind to %s failed: %s", address, strerror (errno));
- else if (listen (fd, 16 /* arbitrary number */))
- print_error ("listen on %s failed: %s", address, strerror (errno));
- else
- {
- print_status ("listening on %s", address);
- free (address);
- return fd;
- }
-
- free (address);
- xclose (fd);
- return -1;
-}
-
-static void
-irc_listen_resolve (struct server_context *ctx,
- const char *host, const char *port, struct addrinfo *gai_hints)
-{
- struct addrinfo *gai_result, *gai_iter;
- int err = getaddrinfo (host, port, gai_hints, &gai_result);
- if (err)
- {
- char *address = format_host_port_pair (host, port);
- print_error ("bind to %s failed: %s: %s",
- address, "getaddrinfo", gai_strerror (err));
- free (address);
- return;
- }
-
- int fd;
- for (gai_iter = gai_result; gai_iter; gai_iter = gai_iter->ai_next)
- {
- if (ctx->listen_len == ctx->listen_alloc)
- break;
-
- if ((fd = irc_listen (gai_iter)) == -1)
- continue;
- set_blocking (fd, false);
-
- struct poller_fd *event = &ctx->listen_events[ctx->listen_len];
- *event = poller_fd_make (&ctx->poller, fd);
- event->dispatcher = (poller_fd_fn) on_irc_client_available;
- event->user_data = ctx;
-
- ctx->listen_fds[ctx->listen_len++] = fd;
- poller_fd_set (event, POLLIN);
- }
- freeaddrinfo (gai_result);
-}
-
-static bool
-irc_setup_listen_fds (struct server_context *ctx, struct error **e)
-{
- const char *bind_host = str_map_find (&ctx->config, "bind_host");
- const char *bind_port = str_map_find (&ctx->config, "bind_port");
- hard_assert (bind_port != NULL); // We have a default value for this
-
- struct addrinfo gai_hints;
- memset (&gai_hints, 0, sizeof gai_hints);
-
- gai_hints.ai_socktype = SOCK_STREAM;
- gai_hints.ai_flags = AI_PASSIVE;
-
- struct strv ports = strv_make ();
- cstr_split (bind_port, ",", true, &ports);
-
- // For C and simplicity's sake let's assume that the host will resolve
- // to at most two different addresses: IPv4 and IPv6 in case it is NULL
- ctx->listen_alloc = ports.len * 2;
-
- ctx->listen_fds =
- xcalloc (ctx->listen_alloc, sizeof *ctx->listen_fds);
- ctx->listen_events =
- xcalloc (ctx->listen_alloc, sizeof *ctx->listen_events);
- for (size_t i = 0; i < ports.len; i++)
- irc_listen_resolve (ctx, bind_host, ports.vector[i], &gai_hints);
- strv_free (&ports);
-
- if (!ctx->listen_len)
- {
- error_set (e, "%s: %s",
- "network setup failed", "no ports to listen on");
- return false;
- }
- return true;
-}
-
-// --- Main --------------------------------------------------------------------
-
-static void
-on_signal_pipe_readable (const struct pollfd *fd, struct server_context *ctx)
-{
- char dummy;
- (void) read (fd->fd, &dummy, 1);
-
- if (g_termination_requested && !ctx->quitting)
- irc_initiate_quit (ctx);
-}
-
-static void
-daemonize (struct server_context *ctx)
-{
- print_status ("daemonizing...");
-
- if (chdir ("/"))
- exit_fatal ("%s: %s", "chdir", strerror (errno));
-
- // Because of systemd, we need to exit the parent process _after_ writing
- // a PID file, otherwise our grandchild would receive a SIGTERM
- int sync_pipe[2];
- if (pipe (sync_pipe))
- exit_fatal ("%s: %s", "pipe", strerror (errno));
-
- pid_t pid;
- if ((pid = fork ()) < 0)
- exit_fatal ("%s: %s", "fork", strerror (errno));
- else if (pid)
- {
- // Wait until all write ends of the pipe are closed, which can mean
- // either success or failure, we don't need to care
- xclose (sync_pipe[PIPE_WRITE]);
-
- char dummy;
- if (read (sync_pipe[PIPE_READ], &dummy, 1) < 0)
- exit_fatal ("%s: %s", "read", strerror (errno));
-
- exit (EXIT_SUCCESS);
- }
-
- setsid ();
- signal (SIGHUP, SIG_IGN);
-
- if ((pid = fork ()) < 0)
- exit_fatal ("%s: %s", "fork", strerror (errno));
- else if (pid)
- exit (EXIT_SUCCESS);
-
- openlog (PROGRAM_NAME, LOG_NDELAY | LOG_NOWAIT | LOG_PID, 0);
- g_log_message_real = log_message_syslog;
-
- // Write the PID file (if so configured) and get rid of the pipe, so that
- // the read() in our grandparent finally returns zero (no write ends)
- struct error *e = NULL;
- if (!irc_lock_pid_file (ctx, &e))
- exit_fatal ("%s", e->message);
-
- xclose (sync_pipe[PIPE_READ]);
- xclose (sync_pipe[PIPE_WRITE]);
-
- // XXX: we may close our own descriptors this way, crippling ourselves;
- // there is no real guarantee that we will start with all three
- // descriptors open. In theory we could try to enumerate the descriptors
- // at the start of main().
- for (int i = 0; i < 3; i++)
- xclose (i);
-
- int tty = open ("/dev/null", O_RDWR);
- if (tty != 0 || dup (0) != 1 || dup (0) != 2)
- exit_fatal ("failed to reopen FD's: %s", strerror (errno));
-
- poller_post_fork (&ctx->poller);
-}
-
-int
-main (int argc, char *argv[])
-{
- // Need to call this first as all string maps depend on it
- siphash_wrapper_randomize ();
-
- static const struct opt opts[] =
- {
- { 'd', "debug", NULL, 0, "run in debug mode (do not daemonize)" },
- { 'h', "help", NULL, 0, "display this help and exit" },
- { 'V', "version", NULL, 0, "output version information and exit" },
- { 'w', "write-default-cfg", "FILENAME",
- OPT_OPTIONAL_ARG | OPT_LONG_ONLY,
- "write a default configuration file and exit" },
- { 0, NULL, NULL, 0, NULL }
- };
-
- struct opt_handler oh =
- opt_handler_make (argc, argv, opts, NULL, "IRC daemon.");
-
- int c;
- while ((c = opt_handler_get (&oh)) != -1)
- switch (c)
- {
- case 'd':
- g_debug_mode = true;
- break;
- case 'h':
- opt_handler_usage (&oh, stdout);
- exit (EXIT_SUCCESS);
- case 'V':
- printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
- exit (EXIT_SUCCESS);
- case 'w':
- call_simple_config_write_default (optarg, g_config_table);
- exit (EXIT_SUCCESS);
- default:
- print_error ("wrong options");
- opt_handler_usage (&oh, stderr);
- exit (EXIT_FAILURE);
- }
-
- opt_handler_free (&oh);
-
- print_status (PROGRAM_NAME " " PROGRAM_VERSION " starting");
- setup_signal_handlers ();
- init_openssl ();
-
- struct server_context ctx;
- server_context_init (&ctx);
- ctx.started = time (NULL);
- irc_register_handlers (&ctx);
- irc_register_cap_handlers (&ctx);
-
- struct error *e = NULL;
- if (!simple_config_update_from_file (&ctx.config, &e))
- {
- print_error ("error loading configuration: %s", e->message);
- error_free (e);
- exit (EXIT_FAILURE);
- }
-
- ctx.signal_event = poller_fd_make (&ctx.poller, g_signal_pipe[0]);
- ctx.signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable;
- ctx.signal_event.user_data = &ctx;
- poller_fd_set (&ctx.signal_event, POLLIN);
-
- if (!irc_initialize_tls (&ctx, &e)
- || !irc_initialize_server_name (&ctx, &e)
- || !irc_initialize_motd (&ctx, &e)
- || !irc_initialize_catalog (&ctx, &e)
- || !irc_parse_config (&ctx, &e)
- || !irc_setup_listen_fds (&ctx, &e))
- exit_fatal ("%s", e->message);
-
- if (!g_debug_mode)
- daemonize (&ctx);
- else if (!irc_lock_pid_file (&ctx, &e))
- exit_fatal ("%s", e->message);
-
-#if OpenBSD >= 201605
- // This won't be as simple once we decide to implement REHASH
- if (pledge ("stdio inet dns", NULL))
- exit_fatal ("%s: %s", "pledge", strerror (errno));
-#endif
-
- ctx.polling = true;
- while (ctx.polling)
- poller_run (&ctx.poller);
-
- server_context_free (&ctx);
- return EXIT_SUCCESS;
-}