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authorPřemysl Janouch <p.janouch@gmail.com>2014-07-09 01:54:50 +0200
committerPřemysl Janouch <p.janouch@gmail.com>2014-07-12 21:09:50 +0200
commit705c0e943eb157ba7d6de7c5670c877188f754cc (patch)
tree2bc61b536f2cd28d2ea8d6cae3c21554ed3974e4 /src/kike.c
parent165a19da21d057606926730f432bf298ada2751e (diff)
downloadxK-705c0e943eb157ba7d6de7c5670c877188f754cc.tar.gz
xK-705c0e943eb157ba7d6de7c5670c877188f754cc.tar.xz
xK-705c0e943eb157ba7d6de7c5670c877188f754cc.zip
WIP: add a stub IRC daemon named `kike'
As it is going to share a great lot of functionality with ZyklonB, I have decided to extract the common parts into `common.c' and make the two subprojects include this file. The Single Compile Unit concept has proven valuable (sub-second compile times, dead code warnings, almost no need for function declarations, whole-program optimizations), and the sources aren't that long so far anyway. I am probably going to add CMake support later but so far it's not a priority. This project is meant to be portable and freely relocatable (ie. no hardcoded paths if I can avoid it).
Diffstat (limited to 'src/kike.c')
-rw-r--r--src/kike.c796
1 files changed, 796 insertions, 0 deletions
diff --git a/src/kike.c b/src/kike.c
new file mode 100644
index 0000000..bf13476
--- /dev/null
+++ b/src/kike.c
@@ -0,0 +1,796 @@
+/*
+ * kike.c: the experimental IRC daemon
+ *
+ * Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#define PROGRAM_NAME "kike"
+#define PROGRAM_VERSION "alpha"
+
+#include "common.c"
+
+// --- Configuration (application-specific) ------------------------------------
+
+static struct config_item g_config_table[] =
+{
+ { "server_name", NULL, "Server name" },
+ { "bind_host", NULL, "Address of the IRC server" },
+ { "bind_port", "6667", "Port of the IRC server" },
+ { "ssl_cert", NULL, "Server SSL certificate (PEM)" },
+ { "ssl_key", NULL, "Server SSL private key (PEM)" },
+
+ { "max_connections", NULL, "Maximum client connections" },
+ { 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)
+ {
+ print_fatal ("pipe: %s", strerror (errno));
+ exit (EXIT_FAILURE);
+ }
+
+ 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)
+ {
+ print_error ("sigaction: %s", strerror (errno));
+ exit (EXIT_FAILURE);
+ }
+}
+
+// --- Application data --------------------------------------------------------
+
+enum
+{
+ IRC_USER_MODE_INVISIBLE = (1 << 0),
+ IRC_USER_MODE_RX_WALLOPS = (1 << 1),
+ IRC_USER_MODE_RESTRICTED = (1 << 2),
+ IRC_USER_MODE_OPERATOR = (1 << 3),
+ IRC_USER_MODE_RX_SERVER_NOTICES = (1 << 4)
+};
+
+struct connection
+{
+ struct connection *next; ///< The next link in a chain
+ struct connection *prev; ///< The previous link in a chain
+
+ struct server_context *ctx; ///< Server context
+
+ int socket_fd; ///< The TCP socket
+ struct str read_buffer; ///< Unprocessed input
+ struct str write_buffer; ///< Output yet to be sent out
+
+ unsigned initialized : 1; ///< Has any data been received yet?
+ unsigned ssl_rx_want_tx : 1; ///< SSL_read() wants to write
+ unsigned ssl_tx_want_rx : 1; ///< SSL_write() wants to read
+
+ SSL_CTX *ssl_ctx; ///< SSL context
+ SSL *ssl; ///< SSL connection
+
+ char *nickname; ///< IRC nickname (main identifier)
+ char *username; ///< IRC username
+ char *fullname; ///< IRC fullname (e-mail)
+
+ char *hostname; ///< Hostname shown to the network
+
+ unsigned mode; ///< User's mode
+ char *away_message; ///< Away message
+};
+
+static void
+connection_init (struct connection *self)
+{
+ memset (self, 0, sizeof *self);
+
+ self->socket_fd = -1;
+ str_init (&self->read_buffer);
+ str_init (&self->write_buffer);
+}
+
+static void
+connection_free (struct connection *self)
+{
+ if (!soft_assert (self->socket_fd == -1))
+ xclose (self->socket_fd);
+ if (self->ssl_ctx)
+ SSL_CTX_free (self->ssl_ctx);
+ if (self->ssl)
+ SSL_free (self->ssl);
+
+ str_free (&self->read_buffer);
+ str_free (&self->write_buffer);
+
+ free (self->nickname);
+ free (self->username);
+ free (self->fullname);
+
+ free (self->hostname);
+ free (self->away_message);
+}
+
+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_SECRET = (1 << 3),
+ IRC_CHAN_MODE_PRIVATE = (1 << 4),
+ IRC_CHAN_MODE_PROTECTED_TOPIC = (1 << 5),
+ IRC_CHAN_MODE_QUIET = (1 << 6)
+};
+
+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
+
+ struct str_vector ban_list; ///< Ban list
+ struct str_vector exception_list; ///< Exceptions from bans
+ struct str_vector invite_list; ///< Exceptions from +I
+};
+
+static void
+channel_init (struct channel *self)
+{
+ memset (self, 0, sizeof *self);
+
+ str_vector_init (&self->ban_list);
+ str_vector_init (&self->exception_list);
+ str_vector_init (&self->invite_list);
+}
+
+static void
+channel_free (struct channel *self)
+{
+ free (self->name);
+ free (self->key);
+
+ str_vector_free (&self->ban_list);
+ str_vector_free (&self->exception_list);
+ str_vector_free (&self->invite_list);
+}
+
+struct server_context
+{
+ struct str_map config; ///< Server configuration
+
+ int listen_fd; ///< Listening socket FD
+ struct connection *clients; ///< Client connections
+
+ struct str_map users; ///< Maps nicknames to connections
+ struct str_map channels; ///< Maps channel names to data
+
+ struct poller poller; ///< Manages polled description
+ bool polling; ///< The event loop is running
+};
+
+static void
+server_context_init (struct server_context *self)
+{
+ str_map_init (&self->config);
+ self->config.free = free;
+ load_config_defaults (&self->config, g_config_table);
+
+ self->listen_fd = -1;
+ self->clients = NULL;
+
+ str_map_init (&self->users);
+ // TODO: set channel_free() as the free function?
+ str_map_init (&self->channels);
+
+ poller_init (&self->poller);
+ self->polling = false;
+}
+
+static void
+server_context_free (struct server_context *self)
+{
+ str_map_free (&self->config);
+
+ if (self->listen_fd != -1)
+ xclose (self->listen_fd);
+
+ // TODO: terminate the connections properly before this is called
+ struct connection *link, *tmp;
+ for (link = self->clients; link; link = tmp)
+ {
+ tmp = link->next;
+ connection_free (link);
+ free (link);
+ }
+
+ str_map_free (&self->users);
+ str_map_free (&self->channels);
+ poller_free (&self->poller);
+}
+
+// --- Main program ------------------------------------------------------------
+
+static size_t network_error_domain_tag;
+#define NETWORK_ERROR (error_resolve_domain (&network_error_domain_tag))
+
+enum
+{
+ NETWORK_ERROR_INVALID_CONFIGURATION,
+ NETWORK_ERROR_FAILED
+};
+
+static bool
+irc_autodetect_ssl (struct connection *conn)
+{
+ // 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 (conn->socket_fd, buf, sizeof buf, MSG_PEEK))
+ {
+ case 3:
+ if ((buf[0] & 0x80) && buf[2] == 1)
+ return true;
+ case 2:
+ if (buf[0] == 22 && buf[1] == 3)
+ return true;
+ break;
+ case 1:
+ if (buf[0] == 22)
+ return true;
+ break;
+ case 0:
+ break;
+ default:
+ if (errno == EINTR)
+ goto start;
+ }
+ return false;
+}
+
+static int
+irc_ssl_verify_callback (int verify_ok, X509_STORE_CTX *ctx)
+{
+ (void) verify_ok;
+ (void) ctx;
+
+ // We only want to provide additional privileges based on the client's
+ // certificate, so let's not terminate the connection because of a failure.
+ return 1;
+}
+
+static bool
+irc_initialize_ssl (struct connection *conn)
+{
+ struct server_context *ctx = conn->ctx;
+
+ conn->ssl_ctx = SSL_CTX_new (SSLv23_server_method ());
+ if (!conn->ssl_ctx)
+ goto error_ssl_1;
+ SSL_CTX_set_verify (conn->ssl_ctx,
+ SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, irc_ssl_verify_callback);
+ // XXX: maybe we should call SSL_CTX_set_options() for some workarounds
+
+ conn->ssl = SSL_new (conn->ssl_ctx);
+ if (!conn->ssl)
+ goto error_ssl_2;
+
+ const char *ssl_cert = str_map_find (&ctx->config, "ssl_cert");
+ if (ssl_cert
+ && !SSL_CTX_use_certificate_chain_file (conn->ssl_ctx, ssl_cert))
+ {
+ // XXX: perhaps we should read the file ourselves for better messages
+ print_error ("%s: %s", "setting the SSL client certificate failed",
+ ERR_error_string (ERR_get_error (), NULL));
+ }
+
+ const char *ssl_key = str_map_find (&ctx->config, "ssl_key");
+ if (ssl_key
+ && !SSL_use_PrivateKey_file (conn->ssl, ssl_key, SSL_FILETYPE_PEM))
+ {
+ // XXX: perhaps we should read the file ourselves for better messages
+ print_error ("%s: %s", "setting the SSL private key failed",
+ ERR_error_string (ERR_get_error (), NULL));
+ }
+
+ // TODO: SSL_check_private_key(conn->ssl)? It is has probably already been
+ // checked by SSL_use_PrivateKey_file() above.
+
+ SSL_set_accept_state (conn->ssl);
+ if (!SSL_set_fd (conn->ssl, conn->socket_fd))
+ goto error_ssl_3;
+ // Gah, spare me your awkward semantics, I just want to push data!
+ // XXX: do we want SSL_MODE_AUTO_RETRY as well? I guess not.
+ SSL_set_mode (conn->ssl,
+ SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
+ return true;
+
+error_ssl_3:
+ SSL_free (conn->ssl);
+ conn->ssl = NULL;
+error_ssl_2:
+ SSL_CTX_free (conn->ssl_ctx);
+ conn->ssl_ctx = NULL;
+error_ssl_1:
+ // XXX: these error strings are really nasty; also there could be
+ // multiple errors on the OpenSSL stack.
+ print_error ("%s: %s", "could not initialize SSL",
+ ERR_error_string (ERR_get_error (), NULL));
+ return false;
+}
+
+static void
+connection_abort (struct connection *conn, const char *reason)
+{
+ // TODO: send a QUIT message with `reason' || "Client exited"
+ (void) reason;
+
+ // TODO: do further cleanup if the client has successfully registered
+
+ struct server_context *ctx = conn->ctx;
+ ssize_t i = poller_find_by_fd (&ctx->poller, conn->socket_fd);
+ if (i != -1)
+ poller_remove_at_index (&ctx->poller, i);
+
+ xclose (conn->socket_fd);
+ conn->socket_fd = -1;
+ connection_free (conn);
+ LIST_UNLINK (ctx->clients, conn);
+ free (conn);
+}
+
+static void
+irc_process_message (const struct irc_message *msg,
+ const char *raw, void *user_data)
+{
+ struct connection *conn = user_data;
+ // TODO
+}
+
+static bool
+irc_try_read (struct connection *conn)
+{
+ // TODO
+ return false;
+}
+
+static bool
+irc_try_read_ssl (struct connection *conn)
+{
+ if (conn->ssl_tx_want_rx)
+ return true;
+
+ struct str *buf = &conn->read_buffer;
+ conn->ssl_rx_want_tx = false;
+ while (true)
+ {
+ str_ensure_space (buf, 512);
+ int n_read = SSL_read (conn->ssl, buf->str + buf->len,
+ buf->alloc - buf->len - 1 /* null byte */);
+
+ const char *error_info = NULL;
+ switch (xssl_get_error (conn->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, conn);
+ continue;
+ case SSL_ERROR_ZERO_RETURN:
+ connection_abort (conn, NULL);
+ return false;
+ case SSL_ERROR_WANT_READ:
+ return true;
+ case SSL_ERROR_WANT_WRITE:
+ conn->ssl_rx_want_tx = true;
+ return false;
+ case XSSL_ERROR_TRY_AGAIN:
+ continue;
+ default:
+ print_debug ("%s: %s: %s", __func__, "SSL_read", error_info);
+ connection_abort (conn, error_info);
+ return false;
+ }
+ }
+}
+
+static bool
+irc_try_write (struct connection *conn)
+{
+ // TODO
+ return false;
+}
+
+static bool
+irc_try_write_ssl (struct connection *conn)
+{
+ if (conn->ssl_rx_want_tx)
+ return true;
+
+ struct str *buf = &conn->write_buffer;
+ conn->ssl_tx_want_rx = false;
+ while (buf->len)
+ {
+ int n_written = SSL_write (conn->ssl, buf->str, buf->len);
+
+ const char *error_info = NULL;
+ switch (xssl_get_error (conn->ssl, n_written, &error_info))
+ {
+ case SSL_ERROR_NONE:
+ str_remove_slice (buf, 0, n_written);
+ continue;
+ case SSL_ERROR_ZERO_RETURN:
+ connection_abort (conn, NULL);
+ return false;
+ case SSL_ERROR_WANT_WRITE:
+ return true;
+ case SSL_ERROR_WANT_READ:
+ conn->ssl_tx_want_rx = true;
+ return false;
+ case XSSL_ERROR_TRY_AGAIN:
+ continue;
+ default:
+ print_debug ("%s: %s: %s", __func__, "SSL_write", error_info);
+ connection_abort (conn, error_info);
+ return false;
+ }
+ }
+ return true;
+}
+
+static void
+on_irc_client_ready (const struct pollfd *pfd, void *user_data)
+{
+ // XXX: check/load `ssl_cert' and `ssl_key' earlier?
+ struct connection *conn = user_data;
+ if (!conn->initialized)
+ {
+ hard_assert (pfd->events == POLLIN);
+ // XXX: what with the error from irc_initialize_ssl()?
+ if (irc_autodetect_ssl (conn) && !irc_initialize_ssl (conn))
+ {
+ connection_abort (conn, NULL);
+ return;
+ }
+ conn->initialized = true;
+ }
+
+ // FIXME: aborting a connection inside try_read() will fuck things up
+ int new_events = 0;
+ if (conn->ssl)
+ {
+ // Reads may want to write, writes may want to read, poll() may
+ // return unexpected things in `revents'... let's try both
+ irc_try_read_ssl (conn) && irc_try_write_ssl (conn);
+
+ new_events |= POLLIN;
+ if (conn->write_buffer.len || conn->ssl_rx_want_tx)
+ new_events |= POLLOUT;
+
+ // While we're waiting for an opposite event, we ignore the original
+ if (conn->ssl_rx_want_tx) new_events &= ~POLLIN;
+ if (conn->ssl_tx_want_rx) new_events &= ~POLLOUT;
+ }
+ else
+ {
+ irc_try_read (conn) && irc_try_write (conn);
+
+ new_events |= POLLIN;
+ if (conn->write_buffer.len)
+ new_events |= POLLOUT;
+ }
+
+ hard_assert (new_events != 0);
+ if (pfd->events != new_events)
+ poller_set (&conn->ctx->poller, conn->socket_fd, new_events,
+ (poller_dispatcher_func) on_irc_client_ready, conn);
+}
+
+static void
+on_irc_connection_available (const struct pollfd *pfd, void *user_data)
+{
+ (void) pfd;
+ struct server_context *ctx = user_data;
+
+ // TODO: stop accepting new connections when `max_connections' is reached
+
+ while (true)
+ {
+ // XXX: `struct sockaddr_storage' is not the most portable thing
+ struct sockaddr_storage peer;
+ socklen_t peer_len = sizeof peer;
+
+ int fd = accept (ctx->listen_fd, (struct sockaddr *) &peer, &peer_len);
+ if (fd == -1)
+ {
+ if (errno == EAGAIN)
+ break;
+ if (errno == EINTR)
+ continue;
+ if (errno == ECONNABORTED)
+ continue;
+
+ // TODO: handle resource exhaustion (EMFILE, ENFILE) specially
+ // (stop accepting new connections and wait until we close some).
+ print_fatal ("%s: %s", "accept", strerror (errno));
+
+ // FIXME: handle this better, bring the server down cleanly.
+ exit (EXIT_FAILURE);
+ }
+
+ char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown";
+ int err = getnameinfo ((struct sockaddr *) &peer, peer_len,
+ host, sizeof host, port, sizeof port, AI_NUMERICSERV);
+ if (err)
+ print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
+ print_debug ("accepted connection from %s:%s", host, port);
+
+ struct connection *conn = xmalloc (sizeof *conn);
+ connection_init (conn);
+ conn->socket_fd = fd;
+ conn->hostname = xstrdup (host);
+ LIST_PREPEND (ctx->clients, conn);
+
+ // TODO: set a timeout on the socket, something like 3 minutes, then we
+ // should terminate the connection.
+ poller_set (&ctx->poller, conn->socket_fd, POLLIN,
+ (poller_dispatcher_func) on_irc_client_ready, conn);
+ }
+}
+
+static bool
+irc_listen (struct server_context *ctx, struct error **e)
+{
+ const char *bind_host = str_map_find (&ctx->config, "bind_host");
+ const char *bind_port = str_map_find (&ctx->config, "bind_port");
+ hard_assert (bind_port != NULL); // We have a default value for this
+
+ struct addrinfo gai_hints, *gai_result, *gai_iter;
+ memset (&gai_hints, 0, sizeof gai_hints);
+
+ gai_hints.ai_socktype = SOCK_STREAM;
+ gai_hints.ai_flags = AI_PASSIVE;
+
+ int err = getaddrinfo (bind_host, bind_port, &gai_hints, &gai_result);
+ if (err)
+ {
+ error_set (e, NETWORK_ERROR, NETWORK_ERROR_FAILED, "%s: %s: %s",
+ "network setup failed", "getaddrinfo", gai_strerror (err));
+ return false;
+ }
+
+ int sockfd;
+ char real_host[NI_MAXHOST], real_port[NI_MAXSERV];
+
+ for (gai_iter = gai_result; gai_iter; gai_iter = gai_iter->ai_next)
+ {
+ sockfd = socket (gai_iter->ai_family,
+ gai_iter->ai_socktype, gai_iter->ai_protocol);
+ if (sockfd == -1)
+ continue;
+ set_cloexec (sockfd);
+
+ int yes = 1;
+ soft_assert (setsockopt (sockfd, SOL_SOCKET, SO_KEEPALIVE,
+ &yes, sizeof yes) != -1);
+ soft_assert (setsockopt (sockfd, SOL_SOCKET, SO_REUSEADDR,
+ &yes, sizeof yes) != -1);
+
+ real_host[0] = real_port[0] = '\0';
+ err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen,
+ real_host, sizeof real_host, real_port, sizeof real_port,
+ NI_NUMERICHOST | NI_NUMERICSERV);
+ if (err)
+ print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
+
+ if (bind (sockfd, gai_iter->ai_addr, gai_iter->ai_addrlen))
+ print_error ("bind() to %s:%s failed: %s",
+ real_host, real_port, strerror (errno));
+ else if (listen (sockfd, 16 /* arbitrary number */))
+ print_error ("listen() at %s:%s failed: %s",
+ real_host, real_port, strerror (errno));
+ else
+ break;
+
+ xclose (sockfd);
+ }
+
+ freeaddrinfo (gai_result);
+
+ if (!gai_iter)
+ {
+ error_set (e, NETWORK_ERROR, NETWORK_ERROR_FAILED,
+ "network setup failed");
+ return false;
+ }
+
+ ctx->listen_fd = sockfd;
+ poller_set (&ctx->poller, ctx->listen_fd, POLLIN,
+ (poller_dispatcher_func) on_irc_connection_available, ctx);
+
+ print_status ("listening at %s:%s", real_host, real_port);
+ return true;
+}
+
+static void
+on_signal_pipe_readable (const struct pollfd *fd, struct server_context *ctx)
+{
+ char *dummy;
+ (void) read (fd->fd, &dummy, 1);
+
+#if 0
+ // TODO
+ if (g_termination_requested && !ctx->quitting)
+ {
+ initiate_quit (ctx);
+ }
+#endif
+}
+
+static void
+print_usage (const char *program_name)
+{
+ fprintf (stderr,
+ "Usage: %s [OPTION]...\n"
+ "Experimental IRC server.\n"
+ "\n"
+ " -d, --debug run in debug mode (do not daemonize)\n"
+ " -h, --help display this help and exit\n"
+ " -V, --version output version information and exit\n"
+ " --write-default-cfg [filename]\n"
+ " write a default configuration file and exit\n",
+ program_name);
+}
+
+int
+main (int argc, char *argv[])
+{
+ const char *invocation_name = argv[0];
+
+ struct error *e = NULL;
+ static struct option opts[] =
+ {
+ { "debug", no_argument, NULL, 'd' },
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+ { "write-default-cfg", optional_argument, NULL, 'w' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ while (1)
+ {
+ int c, opt_index;
+
+ c = getopt_long (argc, argv, "dhV", opts, &opt_index);
+ if (c == -1)
+ break;
+
+ switch (c)
+ {
+ case 'd':
+ g_debug_mode = true;
+ break;
+ case 'h':
+ print_usage (invocation_name);
+ exit (EXIT_SUCCESS);
+ case 'V':
+ printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
+ exit (EXIT_SUCCESS);
+ case 'w':
+ {
+ char *filename = write_default_config (optarg, g_config_table, &e);
+ if (!filename)
+ {
+ print_fatal ("%s", e->message);
+ error_free (e);
+ exit (EXIT_FAILURE);
+ }
+ print_status ("configuration written to `%s'", filename);
+ free (filename);
+ exit (EXIT_SUCCESS);
+ }
+ default:
+ print_fatal ("error in options");
+ exit (EXIT_FAILURE);
+ }
+ }
+
+ print_status (PROGRAM_NAME " " PROGRAM_VERSION " starting");
+ setup_signal_handlers ();
+
+ SSL_library_init ();
+ atexit (EVP_cleanup);
+ SSL_load_error_strings ();
+ // XXX: ERR_load_BIO_strings()? Anything else?
+ atexit (ERR_free_strings);
+
+ struct server_context ctx;
+ server_context_init (&ctx);
+
+ if (!read_config_file (&ctx.config, &e))
+ {
+ print_fatal ("error loading configuration: %s", e->message);
+ error_free (e);
+ exit (EXIT_FAILURE);
+ }
+
+ poller_set (&ctx.poller, g_signal_pipe[0], POLLIN,
+ (poller_dispatcher_func) on_signal_pipe_readable, &ctx);
+
+ if (!irc_listen (&ctx, &e))
+ {
+ print_error ("%s", e->message);
+ error_free (e);
+ exit (EXIT_FAILURE);
+ }
+
+ // TODO: daemonize
+
+ ctx.polling = true;
+ while (ctx.polling)
+ poller_run (&ctx.poller);
+
+ server_context_free (&ctx);
+ return EXIT_SUCCESS;
+}