5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2002 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
21 * This is the actual SILC server than handles everything relating to
22 * servicing the SILC connections. This is also a SILC router as a router
23 * is also normal server.
27 #include "serverincludes.h"
28 #include "server_internal.h"
30 /* Static prototypes */
31 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry);
32 SILC_TASK_CALLBACK(silc_server_connect_router);
33 SILC_TASK_CALLBACK(silc_server_connect_to_router);
34 SILC_TASK_CALLBACK(silc_server_connect_to_router_second);
35 SILC_TASK_CALLBACK(silc_server_connect_to_router_final);
36 SILC_TASK_CALLBACK(silc_server_accept_new_connection);
37 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second);
38 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final);
39 SILC_TASK_CALLBACK(silc_server_packet_process);
40 SILC_TASK_CALLBACK(silc_server_packet_parse_real);
41 SILC_TASK_CALLBACK(silc_server_close_connection_final);
42 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout);
43 SILC_TASK_CALLBACK(silc_server_timeout_remote);
44 SILC_TASK_CALLBACK(silc_server_channel_key_rekey);
45 SILC_TASK_CALLBACK(silc_server_failure_callback);
46 SILC_TASK_CALLBACK(silc_server_rekey_callback);
47 SILC_TASK_CALLBACK(silc_server_get_stats);
49 /* Allocates a new SILC server object. This has to be done before the server
50 can be used. After allocation one must call silc_server_init to initialize
51 the server. The new allocated server object is returned to the new_server
54 int silc_server_alloc(SilcServer *new_server)
58 SILC_LOG_DEBUG(("Allocating new server object"));
60 server = silc_calloc(1, sizeof(*server));
61 server->server_type = SILC_SERVER;
62 server->standalone = TRUE;
63 server->local_list = silc_calloc(1, sizeof(*server->local_list));
64 server->global_list = silc_calloc(1, sizeof(*server->global_list));
65 server->pending_commands = silc_dlist_init();
67 server->sim = silc_dlist_init();
75 /* Free's the SILC server object. This is called at the very end before
78 void silc_server_free(SilcServer server)
84 while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
85 silc_dlist_del(server->sim, sim);
88 silc_dlist_uninit(server->sim);
91 silc_server_config_unref(&server->config_ref);
93 silc_rng_free(server->rng);
95 silc_pkcs_free(server->pkcs);
96 if (server->public_key)
97 silc_pkcs_public_key_free(server->public_key);
98 if (server->private_key)
99 silc_pkcs_private_key_free(server->private_key);
100 if (server->pending_commands)
101 silc_dlist_uninit(server->pending_commands);
102 if (server->id_entry)
103 silc_idlist_del_server(server->local_list, server->id_entry);
105 silc_idcache_free(server->local_list->clients);
106 silc_idcache_free(server->local_list->servers);
107 silc_idcache_free(server->local_list->channels);
108 silc_idcache_free(server->global_list->clients);
109 silc_idcache_free(server->global_list->servers);
110 silc_idcache_free(server->global_list->channels);
111 silc_hash_table_free(server->watcher_list);
113 silc_free(server->sockets);
118 /* Opens a listening port.
119 XXX This function will become more general and will support multiple
122 static bool silc_server_listen(SilcServer server, int *sock)
125 *sock = silc_net_create_server(server->config->server_info->port,
126 server->config->server_info->server_ip);
128 SILC_LOG_ERROR(("Could not create server listener: %s on %hu",
129 server->config->server_info->server_ip,
130 server->config->server_info->port));
136 /* Initializes the entire SILC server. This is called always before running
137 the server. This is called only once at the initialization of the program.
138 This binds the server to its listenning port. After this function returns
139 one should call silc_server_run to start the server. This returns TRUE
140 when everything is ok to run the server. Configuration file must be
141 read and parsed before calling this. */
143 bool silc_server_init(SilcServer server)
147 SilcServerEntry id_entry;
148 SilcIDListPurge purge;
149 SilcSocketConnection newsocket = NULL;
151 SILC_LOG_DEBUG(("Initializing server"));
153 server->starttime = time(NULL);
155 /* Take config object for us */
156 silc_server_config_ref(&server->config_ref, server->config,
159 /* Steal public and private key from the config object */
160 server->public_key = server->config->server_info->public_key;
161 server->private_key = server->config->server_info->private_key;
162 server->config->server_info->public_key = NULL;
163 server->config->server_info->private_key = NULL;
165 /* Register all configured ciphers, PKCS and hash functions. */
166 if (!silc_server_config_register_ciphers(server))
167 silc_cipher_register_default();
168 if (!silc_server_config_register_pkcs(server))
169 silc_pkcs_register_default();
170 if (!silc_server_config_register_hashfuncs(server))
171 silc_hash_register_default();
172 if (!silc_server_config_register_hmacs(server))
173 silc_hmac_register_default();
175 /* Initialize random number generator for the server. */
176 server->rng = silc_rng_alloc();
177 silc_rng_init(server->rng);
178 silc_rng_global_init(server->rng);
180 /* Initialize hash functions for server to use */
181 silc_hash_alloc("md5", &server->md5hash);
182 silc_hash_alloc("sha1", &server->sha1hash);
184 /* Allocate PKCS context for local public and private keys */
185 if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
187 silc_pkcs_public_key_set(server->pkcs, server->public_key);
188 silc_pkcs_private_key_set(server->pkcs, server->private_key);
190 /* Initialize the scheduler */
191 server->schedule = silc_schedule_init(server->config->param.connections_max);
192 if (!server->schedule)
195 /* First, register log files configuration for error output */
196 silc_server_config_setlogfiles(server);
198 /* Initialize ID caches */
199 server->local_list->clients =
200 silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
201 server->local_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
202 server->local_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
204 /* These are allocated for normal server as well as these hold some
205 global information that the server has fetched from its router. For
206 router these are used as they are supposed to be used on router. */
207 server->global_list->clients =
208 silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
209 server->global_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
210 server->global_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
212 /* Init watcher list */
213 server->watcher_list =
214 silc_hash_table_alloc(1, silc_hash_client_id_hash, NULL,
215 silc_hash_data_compare, (void *)CLIENTID_HASH_LEN,
217 if (!server->watcher_list)
220 /* Create a listening server */
221 if (!silc_server_listen(server, &sock))
224 /* Set socket to non-blocking mode */
225 silc_net_set_socket_nonblock(sock);
228 /* Allocate the entire socket list that is used in server. Eventually
229 all connections will have entry in this table (it is a table of
230 pointers to the actual object that is allocated individually
232 server->sockets = silc_calloc(server->config->param.connections_max,
233 sizeof(*server->sockets));
234 if (!server->sockets)
237 /* Add ourselves also to the socket table. The entry allocated above
238 is sent as argument for fast referencing in the future. */
239 silc_socket_alloc(sock, SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
240 server->sockets[sock] = newsocket;
242 /* Perform name and address lookups to resolve the listenning address
244 if (!silc_net_check_local_by_sock(sock, &newsocket->hostname,
246 if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
248 SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
249 newsocket->hostname ? newsocket->hostname :
250 newsocket->ip ? newsocket->ip : ""));
251 server->stat.conn_failures++;
254 if (!newsocket->hostname)
255 newsocket->hostname = strdup(newsocket->ip);
257 newsocket->port = silc_net_get_local_port(sock);
259 /* Create a Server ID for the server. */
260 silc_id_create_server_id(newsocket->ip, newsocket->port, server->rng, &id);
265 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
266 server->id_string_len = silc_id_get_len(id, SILC_ID_SERVER);
267 server->id_type = SILC_ID_SERVER;
268 server->server_name = server->config->server_info->server_name;
269 server->config->server_info->server_name = NULL;
271 /* Add ourselves to the server list. We don't have a router yet
272 beacuse we haven't established a route yet. It will be done later.
273 For now, NULL is sent as router. This allocates new entry to
276 silc_idlist_add_server(server->local_list, strdup(server->server_name),
277 server->server_type, server->id, NULL, NULL);
279 SILC_LOG_ERROR(("Could not add ourselves to cache"));
282 id_entry->data.status |= SILC_IDLIST_STATUS_REGISTERED;
284 /* Put the allocated socket pointer also to the entry allocated above
285 for fast back-referencing to the socket list. */
286 newsocket->user_data = (void *)id_entry;
287 id_entry->connection = (void *)newsocket;
288 server->id_entry = id_entry;
290 /* Register protocols */
291 silc_server_protocols_register();
293 /* Add the first task to the scheduler. This is task that is executed by
294 timeout. It expires as soon as the caller calls silc_server_run. This
295 task performs authentication protocol and key exchange with our
297 silc_schedule_task_add(server->schedule, 0,
298 silc_server_connect_to_router,
299 (void *)server, 0, 1,
301 SILC_TASK_PRI_NORMAL);
303 /* Add listener task to the scheduler. This task receives new connections
304 to the server. This task remains on the queue until the end of the
306 silc_schedule_task_add(server->schedule, sock,
307 silc_server_accept_new_connection,
308 (void *)server, 0, 0,
310 SILC_TASK_PRI_NORMAL);
311 server->listenning = TRUE;
313 /* If server connections has been configured then we must be router as
314 normal server cannot have server connections, only router connections. */
315 if (server->config->servers) {
316 SilcServerConfigServer *ptr = server->config->servers;
318 server->server_type = SILC_ROUTER;
320 if (ptr->backup_router) {
321 server->server_type = SILC_BACKUP_ROUTER;
322 server->backup_router = TRUE;
323 server->id_entry->server_type = SILC_BACKUP_ROUTER;
330 /* Register the ID Cache purge task. This periodically purges the ID cache
331 and removes the expired cache entries. */
333 /* Clients local list */
334 purge = silc_calloc(1, sizeof(*purge));
335 purge->cache = server->local_list->clients;
336 purge->schedule = server->schedule;
337 purge->timeout = 600;
338 silc_schedule_task_add(purge->schedule, 0,
340 (void *)purge, purge->timeout, 0,
341 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
343 /* Clients global list */
344 purge = silc_calloc(1, sizeof(*purge));
345 purge->cache = server->global_list->clients;
346 purge->schedule = server->schedule;
347 purge->timeout = 300;
348 silc_schedule_task_add(purge->schedule, 0,
350 (void *)purge, purge->timeout, 0,
351 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
353 /* If we are normal server we'll retrieve network statisticial information
354 once in a while from the router. */
355 if (server->server_type == SILC_SERVER)
356 silc_schedule_task_add(purge->schedule, 0, silc_server_get_stats,
357 server, 10, 0, SILC_TASK_TIMEOUT,
360 SILC_LOG_DEBUG(("Server initialized"));
362 /* We are done here, return succesfully */
366 silc_server_config_unref(&server->config_ref);
367 silc_net_close_server(sock);
371 /* This function basically reads the config file again and switches the config
372 object pointed by the server object. After that, we have to fix various
373 things such as the server_name and the listening ports.
374 Keep in mind that we no longer have the root privileges at this point. */
376 bool silc_server_rehash(SilcServer server)
378 SilcServerConfig newconfig;
380 SILC_LOG_INFO(("Rehashing server"));
382 /* Reset the logging system */
383 silc_log_quick = TRUE;
384 silc_log_flush_all();
386 /* Start the main rehash phase (read again the config file) */
387 newconfig = silc_server_config_alloc(server->config_file);
389 SILC_LOG_ERROR(("Rehash FAILED."));
393 /* Reinit scheduler if necessary */
394 if (newconfig->param.connections_max > server->config->param.connections_max)
395 if (!silc_schedule_reinit(server->schedule,
396 newconfig->param.connections_max))
399 /* Fix the server_name field */
400 if (strcmp(server->server_name, newconfig->server_info->server_name)) {
401 silc_free(server->server_name);
402 server->server_name = newconfig->server_info->server_name;
403 newconfig->server_info->server_name = NULL;
405 /* Update the idcache list with a fresh pointer */
406 silc_free(server->id_entry->server_name);
407 server->id_entry->server_name = strdup(server->server_name);
408 if (!silc_idcache_del_by_context(server->local_list->servers,
411 if (!silc_idcache_add(server->local_list->servers,
412 server->id_entry->server_name,
413 server->id_entry->id, server->id_entry, 0, NULL))
418 silc_server_config_setlogfiles(server);
420 /* Change new key pair if necessary */
421 if (newconfig->server_info->public_key &&
422 !silc_pkcs_public_key_compare(server->public_key,
423 newconfig->server_info->public_key)) {
424 silc_pkcs_public_key_free(server->public_key);
425 silc_pkcs_private_key_free(server->private_key);
426 server->public_key = newconfig->server_info->public_key;
427 server->private_key = newconfig->server_info->private_key;
428 newconfig->server_info->public_key = NULL;
429 newconfig->server_info->private_key = NULL;
431 /* Allocate PKCS context for local public and private keys */
432 silc_pkcs_free(server->pkcs);
433 if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
435 silc_pkcs_public_key_set(server->pkcs, server->public_key);
436 silc_pkcs_private_key_set(server->pkcs, server->private_key);
439 /* Go through all configured routers after rehash */
440 silc_schedule_task_add(server->schedule, 0,
441 silc_server_connect_to_router,
442 (void *)server, 0, 1,
444 SILC_TASK_PRI_NORMAL);
446 /* Check whether our router status has changed */
447 if (newconfig->servers) {
448 SilcServerConfigServer *ptr = newconfig->servers;
450 server->server_type = SILC_ROUTER;
452 if (ptr->backup_router) {
453 server->server_type = SILC_BACKUP_ROUTER;
454 server->backup_router = TRUE;
455 server->id_entry->server_type = SILC_BACKUP_ROUTER;
462 /* Our old config is gone now. We'll unreference our reference made in
463 silc_server_init and then destroy it since we are destroying it
464 underneath the application (layer which called silc_server_init). */
465 silc_server_config_unref(&server->config_ref);
466 silc_server_config_destroy(server->config);
468 /* Take new config context */
469 server->config = newconfig;
470 silc_server_config_ref(&server->config_ref, server->config, server->config);
472 SILC_LOG_DEBUG(("Server rehashed"));
477 /* The heart of the server. This runs the scheduler thus runs the server.
478 When this returns the server has been stopped and the program will
481 void silc_server_run(SilcServer server)
483 SILC_LOG_INFO(("SILC Server started"));
485 /* Start the scheduler, the heart of the SILC server. When this returns
486 the program will be terminated. */
487 silc_schedule(server->schedule);
490 /* Stops the SILC server. This function is used to shutdown the server.
491 This is usually called after the scheduler has returned. After stopping
492 the server one should call silc_server_free. */
494 void silc_server_stop(SilcServer server)
496 SILC_LOG_DEBUG(("Stopping server"));
498 if (server->schedule) {
499 silc_schedule_stop(server->schedule);
500 silc_schedule_uninit(server->schedule);
501 server->schedule = NULL;
504 silc_server_protocols_unregister();
506 SILC_LOG_DEBUG(("Server stopped"));
509 /* Function that is called when the network connection to a router has
510 been established. This will continue with the key exchange protocol
511 with the remote router. */
513 void silc_server_start_key_exchange(SilcServer server,
514 SilcServerConnection sconn,
517 SilcSocketConnection newsocket;
518 SilcProtocol protocol;
519 SilcServerKEInternalContext *proto_ctx;
520 SilcServerConfigRouter *conn =
521 (SilcServerConfigRouter *) sconn->conn.ref_ptr;
524 /* Cancel any possible retry timeouts */
525 silc_schedule_task_del_by_callback(server->schedule,
526 silc_server_connect_router);
528 /* Set socket options */
529 silc_net_set_socket_nonblock(sock);
530 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
532 /* Create socket connection for the connection. Even though we
533 know that we are connecting to a router we will mark the socket
534 to be unknown connection until we have executed authentication
536 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
537 server->sockets[sock] = newsocket;
538 newsocket->hostname = strdup(sconn->remote_host);
539 newsocket->ip = strdup(sconn->remote_host);
540 newsocket->port = sconn->remote_port;
541 sconn->sock = newsocket;
543 /* Allocate internal protocol context. This is sent as context
545 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
546 proto_ctx->server = (void *)server;
547 proto_ctx->context = (void *)sconn;
548 proto_ctx->sock = newsocket;
549 proto_ctx->rng = server->rng;
550 proto_ctx->responder = FALSE;
552 /* Set Key Exchange flags from configuration, but fall back to global
554 SILC_GET_SKE_FLAGS(conn, proto_ctx);
555 if (server->config->param.key_exchange_pfs)
556 proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
558 /* Perform key exchange protocol. silc_server_connect_to_router_second
559 will be called after the protocol is finished. */
560 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
561 &protocol, proto_ctx,
562 silc_server_connect_to_router_second);
563 newsocket->protocol = protocol;
565 /* Register a timeout task that will be executed if the protocol
566 is not executed within set limit. */
567 proto_ctx->timeout_task =
568 silc_schedule_task_add(server->schedule, sock,
569 silc_server_timeout_remote,
570 server, server->config->key_exchange_timeout, 0,
574 /* Register the connection for network input and output. This sets
575 that scheduler will listen for incoming packets for this connection
576 and sets that outgoing packets may be sent to this connection as
577 well. However, this doesn't set the scheduler for outgoing traffic,
578 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
579 later when outgoing data is available. */
580 context = (void *)server;
581 SILC_REGISTER_CONNECTION_FOR_IO(sock);
583 /* Run the protocol */
584 silc_protocol_execute(protocol, server->schedule, 0, 0);
587 /* Timeout callback that will be called to retry connecting to remote
588 router. This is used by both normal and router server. This will wait
589 before retrying the connecting. The timeout is generated by exponential
590 backoff algorithm. */
592 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
594 SilcServerConnection sconn = (SilcServerConnection)context;
595 SilcServer server = sconn->server;
596 SilcServerConfigRouter *conn = sconn->conn.ref_ptr;
597 SilcServerConfigConnParams *param =
598 (conn->param ? conn->param : &server->config->param);
600 SILC_LOG_INFO(("Retrying connecting to a router"));
602 /* Calculate next timeout */
603 if (sconn->retry_count >= 1) {
604 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
605 if (sconn->retry_timeout > param->reconnect_interval_max)
606 sconn->retry_timeout = param->reconnect_interval_max;
608 sconn->retry_timeout = param->reconnect_interval;
610 sconn->retry_count++;
611 sconn->retry_timeout = sconn->retry_timeout +
612 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
614 /* If we've reached max retry count, give up. */
615 if ((sconn->retry_count > param->reconnect_count) &&
616 !param->reconnect_keep_trying) {
617 SILC_LOG_ERROR(("Could not connect to router, giving up"));
618 silc_server_config_unref(&sconn->conn);
619 silc_free(sconn->remote_host);
620 silc_free(sconn->backup_replace_ip);
625 /* We will lookup a fresh pointer later */
626 silc_server_config_unref(&sconn->conn);
628 /* Wait one before retrying */
629 silc_schedule_task_add(server->schedule, 0, silc_server_connect_router,
630 context, sconn->retry_timeout, 0,
631 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
634 /* Generic routine to use connect to a router. */
636 SILC_TASK_CALLBACK(silc_server_connect_router)
638 SilcServerConnection sconn = (SilcServerConnection)context;
639 SilcServer server = sconn->server;
640 SilcServerConfigRouter *rconn;
643 SILC_LOG_INFO(("Connecting to the %s %s on port %d",
644 (sconn->backup ? "backup router" : "router"),
645 sconn->remote_host, sconn->remote_port));
647 server->router_connect = time(NULL);
648 rconn = silc_server_config_find_router_conn(server, sconn->remote_host,
651 SILC_LOG_INFO(("Unconfigured %s connection %s:%d, cannot connect",
652 (sconn->backup ? "backup router" : "router"),
653 sconn->remote_host, sconn->remote_port));
654 silc_free(sconn->remote_host);
655 silc_free(sconn->backup_replace_ip);
659 silc_server_config_ref(&sconn->conn, server->config, (void *)rconn);
661 /* Connect to remote host */
662 sock = silc_net_create_connection(server->config->server_info->server_ip,
666 SILC_LOG_ERROR(("Could not connect to router %s:%d",
667 sconn->remote_host, sconn->remote_port));
668 if (!sconn->no_reconnect)
669 silc_schedule_task_add(server->schedule, 0,
670 silc_server_connect_to_router_retry,
671 context, 0, 1, SILC_TASK_TIMEOUT,
672 SILC_TASK_PRI_NORMAL);
674 silc_server_config_unref(&sconn->conn);
678 /* Continue with key exchange protocol */
679 silc_server_start_key_exchange(server, sconn, sock);
682 /* This function connects to our primary router or if we are a router this
683 establishes all our primary routes. This is called at the start of the
684 server to do authentication and key exchange with our router - called
687 SILC_TASK_CALLBACK(silc_server_connect_to_router)
689 SilcServer server = (SilcServer)context;
690 SilcServerConnection sconn;
691 SilcServerConfigRouter *ptr;
693 SILC_LOG_DEBUG(("Connecting to router(s)"));
695 if (server->server_type == SILC_SERVER) {
696 SILC_LOG_DEBUG(("We are normal server"));
697 } else if (server->server_type == SILC_ROUTER) {
698 SILC_LOG_DEBUG(("We are router"));
700 SILC_LOG_DEBUG(("We are backup router/normal server"));
703 if (!server->config->routers) {
704 /* There wasn't a configured router, we will continue but we don't
705 have a connection to outside world. We will be standalone server. */
706 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
707 server->standalone = TRUE;
711 /* Cancel any possible retry timeouts */
712 silc_schedule_task_del_by_callback(server->schedule,
713 silc_server_connect_router);
714 silc_schedule_task_del_by_callback(server->schedule,
715 silc_server_connect_to_router_retry);
717 /* Create the connections to all our routes */
718 for (ptr = server->config->routers; ptr; ptr = ptr->next) {
720 SILC_LOG_DEBUG(("%s connection [%s] %s:%d",
721 ptr->backup_router ? "Backup router" : "Router",
722 ptr->initiator ? "Initiator" : "Responder",
723 ptr->host, ptr->port));
725 if (ptr->initiator) {
726 /* Check whether we are connected to this host already */
727 if (silc_server_num_sockets_by_remote(server,
728 silc_net_is_ip(ptr->host) ?
730 silc_net_is_ip(ptr->host) ?
731 NULL : ptr->host, ptr->port,
732 SILC_SOCKET_TYPE_ROUTER)) {
733 SILC_LOG_DEBUG(("We are already connected to this router"));
737 /* Allocate connection object for hold connection specific stuff. */
738 sconn = silc_calloc(1, sizeof(*sconn));
739 sconn->server = server;
740 sconn->remote_host = strdup(ptr->host);
741 sconn->remote_port = ptr->port;
742 sconn->backup = ptr->backup_router;
744 sconn->backup_replace_ip = strdup(ptr->backup_replace_ip);
745 sconn->backup_replace_port = ptr->backup_replace_port;
748 if (!server->router_conn && !sconn->backup)
749 server->router_conn = sconn;
751 silc_schedule_task_add(server->schedule, 0,
752 silc_server_connect_router,
753 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
754 SILC_TASK_PRI_NORMAL);
759 /* Second part of connecting to router(s). Key exchange protocol has been
760 executed and now we will execute authentication protocol. */
762 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
764 SilcProtocol protocol = (SilcProtocol)context;
765 SilcServerKEInternalContext *ctx =
766 (SilcServerKEInternalContext *)protocol->context;
767 SilcServer server = (SilcServer)ctx->server;
768 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
769 SilcSocketConnection sock = ctx->sock;
770 SilcServerConnAuthInternalContext *proto_ctx;
771 SilcServerConfigRouter *conn = NULL;
773 SILC_LOG_DEBUG(("Start"));
775 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
776 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
777 /* Error occured during protocol */
778 silc_protocol_free(protocol);
779 sock->protocol = NULL;
780 silc_ske_free_key_material(ctx->keymat);
782 silc_packet_context_free(ctx->packet);
784 silc_ske_free(ctx->ske);
785 silc_free(ctx->dest_id);
787 silc_server_config_unref(&sconn->conn);
788 silc_free(sconn->remote_host);
789 silc_free(sconn->backup_replace_ip);
791 silc_schedule_task_del_by_callback(server->schedule,
792 silc_server_failure_callback);
793 silc_server_disconnect_remote(server, sock,
794 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
798 /* We now have the key material as the result of the key exchange
799 protocol. Take the key material into use. Free the raw key material
800 as soon as we've set them into use. */
801 if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
802 ctx->sock, ctx->keymat,
803 ctx->ske->prop->cipher,
804 ctx->ske->prop->pkcs,
805 ctx->ske->prop->hash,
806 ctx->ske->prop->hmac,
807 ctx->ske->prop->group,
809 silc_protocol_free(protocol);
810 sock->protocol = NULL;
811 silc_ske_free_key_material(ctx->keymat);
813 silc_packet_context_free(ctx->packet);
815 silc_ske_free(ctx->ske);
816 silc_free(ctx->dest_id);
818 silc_server_config_unref(&sconn->conn);
819 silc_free(sconn->remote_host);
820 silc_free(sconn->backup_replace_ip);
822 silc_schedule_task_del_by_callback(server->schedule,
823 silc_server_failure_callback);
824 silc_server_disconnect_remote(server, sock,
825 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
828 silc_ske_free_key_material(ctx->keymat);
830 /* Allocate internal context for the authentication protocol. This
831 is sent as context for the protocol. */
832 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
833 proto_ctx->server = (void *)server;
834 proto_ctx->context = (void *)sconn;
835 proto_ctx->sock = sock;
836 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
837 proto_ctx->dest_id_type = ctx->dest_id_type;
838 proto_ctx->dest_id = ctx->dest_id;
840 /* Resolve the authentication method used in this connection. Check if
841 we find a match from user configured connections */
842 if (!sconn->conn.ref_ptr)
843 conn = silc_server_config_find_router_conn(server, sock->hostname,
846 conn = sconn->conn.ref_ptr;
849 /* Match found. Use the configured authentication method. Take only
850 the passphrase, since for public key auth we automatically use
851 our local key pair. */
852 if (conn->passphrase) {
853 if (conn->publickeys && !server->config->prefer_passphrase_auth) {
854 proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
856 proto_ctx->auth_data = strdup(conn->passphrase);
857 proto_ctx->auth_data_len = strlen(conn->passphrase);
858 proto_ctx->auth_meth = SILC_AUTH_PASSWORD;
860 } else if (conn->publickeys) {
861 proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
863 proto_ctx->auth_meth = SILC_AUTH_NONE;
866 SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
867 sock->hostname, sock->ip, sock->port));
868 silc_protocol_free(protocol);
869 sock->protocol = NULL;
871 silc_packet_context_free(ctx->packet);
873 silc_ske_free(ctx->ske);
874 silc_free(ctx->dest_id);
876 silc_server_config_unref(&sconn->conn);
877 silc_free(sconn->remote_host);
878 silc_free(sconn->backup_replace_ip);
880 silc_schedule_task_del_by_callback(server->schedule,
881 silc_server_failure_callback);
882 silc_server_disconnect_remote(server, sock,
883 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
887 /* Free old protocol as it is finished now */
888 silc_protocol_free(protocol);
890 silc_packet_context_free(ctx->packet);
892 sock->protocol = NULL;
894 /* Allocate the authentication protocol. This is allocated here
895 but we won't start it yet. We will be receiving party of this
896 protocol thus we will wait that connecting party will make
898 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
899 &sock->protocol, proto_ctx,
900 silc_server_connect_to_router_final);
902 /* Register timeout task. If the protocol is not executed inside
903 this timelimit the connection will be terminated. */
904 proto_ctx->timeout_task =
905 silc_schedule_task_add(server->schedule, sock->sock,
906 silc_server_timeout_remote,
908 server->config->conn_auth_timeout, 0,
912 /* Run the protocol */
913 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
916 /* Finalizes the connection to router. Registers a server task to the
917 queue so that we can accept new connections. */
919 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
921 SilcProtocol protocol = (SilcProtocol)context;
922 SilcServerConnAuthInternalContext *ctx =
923 (SilcServerConnAuthInternalContext *)protocol->context;
924 SilcServer server = (SilcServer)ctx->server;
925 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
926 SilcSocketConnection sock = ctx->sock;
927 SilcServerEntry id_entry;
929 SilcServerHBContext hb_context;
930 unsigned char *id_string;
932 SilcIDListData idata;
933 SilcServerConfigRouter *conn = NULL;
934 SilcServerConfigConnParams *param = NULL;
936 SILC_LOG_DEBUG(("Start"));
938 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
939 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
940 /* Error occured during protocol */
941 silc_free(ctx->dest_id);
942 silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
947 /* Add a task to the queue. This task receives new connections to the
948 server. This task remains on the queue until the end of the program. */
949 if (!server->listenning && !sconn->backup) {
950 silc_schedule_task_add(server->schedule, server->sock,
951 silc_server_accept_new_connection,
952 (void *)server, 0, 0,
954 SILC_TASK_PRI_NORMAL);
955 server->listenning = TRUE;
958 /* Send NEW_SERVER packet to the router. We will become registered
959 to the SILC network after sending this packet. */
960 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
961 id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
962 packet = silc_buffer_alloc(2 + 2 + id_len + strlen(server->server_name));
963 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
964 silc_buffer_format(packet,
965 SILC_STR_UI_SHORT(id_len),
966 SILC_STR_UI_XNSTRING(id_string, id_len),
967 SILC_STR_UI_SHORT(strlen(server->server_name)),
968 SILC_STR_UI_XNSTRING(server->server_name,
969 strlen(server->server_name)),
972 /* Send the packet */
973 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
974 packet->data, packet->len, TRUE);
975 silc_buffer_free(packet);
976 silc_free(id_string);
978 SILC_LOG_INFO(("Connected to router %s", sock->hostname));
980 /* Check that we do not have this ID already */
981 id_entry = silc_idlist_find_server_by_id(server->local_list,
982 ctx->dest_id, TRUE, NULL);
984 silc_idcache_del_by_context(server->local_list->servers, id_entry);
986 id_entry = silc_idlist_find_server_by_id(server->global_list,
987 ctx->dest_id, TRUE, NULL);
989 silc_idcache_del_by_context(server->global_list->servers, id_entry);
992 SILC_LOG_DEBUG(("New server id(%s)",
993 silc_id_render(ctx->dest_id, SILC_ID_SERVER)));
995 /* Add the connected router to global server list */
996 id_entry = silc_idlist_add_server(server->global_list,
997 strdup(sock->hostname),
998 SILC_ROUTER, ctx->dest_id, NULL, sock);
1000 silc_free(ctx->dest_id);
1001 SILC_LOG_ERROR(("Cannot add new server entry to cache"));
1002 silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1007 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1008 silc_free(sock->user_data);
1009 sock->user_data = (void *)id_entry;
1010 sock->type = SILC_SOCKET_TYPE_ROUTER;
1011 idata = (SilcIDListData)sock->user_data;
1012 idata->status |= SILC_IDLIST_STATUS_REGISTERED;
1014 conn = sconn->conn.ref_ptr;
1015 param = &server->config->param;
1016 if (conn && conn->param)
1017 param = conn->param;
1019 /* Perform keepalive. The `hb_context' will be freed automatically
1020 when finally calling the silc_socket_free function. */
1021 hb_context = silc_calloc(1, sizeof(*hb_context));
1022 hb_context->server = server;
1023 silc_socket_set_heartbeat(sock, param->keepalive_secs, hb_context,
1024 silc_server_perform_heartbeat,
1027 /* Register re-key timeout */
1028 idata->rekey->timeout = param->key_exchange_rekey;
1029 idata->rekey->context = (void *)server;
1030 silc_schedule_task_add(server->schedule, sock->sock,
1031 silc_server_rekey_callback,
1032 (void *)sock, idata->rekey->timeout, 0,
1033 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1035 if (!sconn->backup) {
1036 /* Mark this router our primary router if we're still standalone */
1037 if (server->standalone) {
1038 server->id_entry->router = id_entry;
1039 server->router = id_entry;
1040 server->standalone = FALSE;
1042 /* If we are router then announce our possible servers. */
1043 if (server->server_type == SILC_ROUTER)
1044 silc_server_announce_servers(server, FALSE, 0,
1045 server->router->connection);
1047 /* Announce our clients and channels to the router */
1048 silc_server_announce_clients(server, 0, server->router->connection);
1049 silc_server_announce_channels(server, 0, server->router->connection);
1052 /* Add this server to be our backup router */
1053 silc_server_backup_add(server, id_entry, sconn->backup_replace_ip,
1054 sconn->backup_replace_port, FALSE);
1057 sock->protocol = NULL;
1059 /* Call the completion callback to indicate that we've connected to
1061 if (sconn->callback)
1062 (*sconn->callback)(server, id_entry, sconn->callback_context);
1065 /* Free the temporary connection data context */
1067 silc_server_config_unref(&sconn->conn);
1068 silc_free(sconn->remote_host);
1069 silc_free(sconn->backup_replace_ip);
1072 if (sconn == server->router_conn)
1073 server->router_conn = NULL;
1075 /* Free the protocol object */
1076 if (sock->protocol == protocol)
1077 sock->protocol = NULL;
1078 silc_protocol_free(protocol);
1080 silc_packet_context_free(ctx->packet);
1082 silc_ske_free(ctx->ske);
1083 if (ctx->auth_meth == SILC_AUTH_PASSWORD)
1084 silc_free(ctx->auth_data);
1088 /* Host lookup callback that is called after the incoming connection's
1089 IP and FQDN lookup is performed. This will actually check the acceptance
1090 of the incoming connection and will register the key exchange protocol
1091 for this connection. */
1094 silc_server_accept_new_connection_lookup(SilcSocketConnection sock,
1097 SilcServer server = (SilcServer)context;
1098 SilcServerKEInternalContext *proto_ctx;
1099 SilcServerConfigClient *cconfig = NULL;
1100 SilcServerConfigServer *sconfig = NULL;
1101 SilcServerConfigRouter *rconfig = NULL;
1102 SilcServerConfigDeny *deny;
1105 SILC_LOG_DEBUG(("Start"));
1107 /* Check whether we could resolve both IP and FQDN. */
1108 if (!sock->ip || (!strcmp(sock->ip, sock->hostname) &&
1109 server->config->require_reverse_lookup)) {
1110 SILC_LOG_ERROR(("IP/DNS lookup failed %s",
1111 sock->hostname ? sock->hostname :
1112 sock->ip ? sock->ip : ""));
1113 server->stat.conn_failures++;
1114 silc_server_disconnect_remote(server, sock,
1115 SILC_STATUS_ERR_INCOMPLETE_INFORMATION,
1116 "Unknown host or IP");
1120 /* Register the connection for network input and output. This sets
1121 that scheduler will listen for incoming packets for this connection
1122 and sets that outgoing packets may be sent to this connection as well.
1123 However, this doesn't set the scheduler for outgoing traffic, it
1124 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1125 later when outgoing data is available. */
1126 SILC_REGISTER_CONNECTION_FOR_IO(sock->sock);
1128 SILC_LOG_INFO(("Incoming connection %s (%s)", sock->hostname,
1131 port = server->sockets[server->sock]->port; /* Listenning port */
1133 /* Check whether this connection is denied to connect to us. */
1134 deny = silc_server_config_find_denied(server, sock->ip);
1136 deny = silc_server_config_find_denied(server, sock->hostname);
1138 /* The connection is denied */
1139 SILC_LOG_INFO(("Connection %s (%s) is denied",
1140 sock->hostname, sock->ip));
1141 silc_server_disconnect_remote(server, sock,
1142 SILC_STATUS_ERR_BANNED_FROM_SERVER,
1144 server->stat.conn_failures++;
1148 /* Check whether we have configured this sort of connection at all. We
1149 have to check all configurations since we don't know what type of
1150 connection this is. */
1151 if (!(cconfig = silc_server_config_find_client(server, sock->ip)))
1152 cconfig = silc_server_config_find_client(server, sock->hostname);
1153 if (!(sconfig = silc_server_config_find_server_conn(server, sock->ip)))
1154 sconfig = silc_server_config_find_server_conn(server, sock->hostname);
1155 if (server->server_type == SILC_ROUTER) {
1156 if (!(rconfig = silc_server_config_find_router_conn(server,
1158 rconfig = silc_server_config_find_router_conn(server, sock->hostname,
1161 if (!cconfig && !sconfig && !rconfig) {
1162 SILC_LOG_INFO(("Connection %s (%s) is not allowed", sock->hostname,
1164 silc_server_disconnect_remote(server, sock,
1165 SILC_STATUS_ERR_BANNED_FROM_SERVER);
1166 server->stat.conn_failures++;
1170 /* The connection is allowed */
1172 /* Allocate internal context for key exchange protocol. This is
1173 sent as context for the protocol. */
1174 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1175 proto_ctx->server = context;
1176 proto_ctx->sock = sock;
1177 proto_ctx->rng = server->rng;
1178 proto_ctx->responder = TRUE;
1179 silc_server_config_ref(&proto_ctx->cconfig, server->config, cconfig);
1180 silc_server_config_ref(&proto_ctx->sconfig, server->config, sconfig);
1181 silc_server_config_ref(&proto_ctx->rconfig, server->config, rconfig);
1183 /* Take flags for key exchange. Since we do not know what type of connection
1184 this is, we go through all found configurations and use the global ones
1185 as well. This will result always into strictest key exchange flags. */
1186 SILC_GET_SKE_FLAGS(cconfig, proto_ctx);
1187 SILC_GET_SKE_FLAGS(sconfig, proto_ctx);
1188 SILC_GET_SKE_FLAGS(rconfig, proto_ctx);
1189 if (server->config->param.key_exchange_pfs)
1190 proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
1192 /* Prepare the connection for key exchange protocol. We allocate the
1193 protocol but will not start it yet. The connector will be the
1194 initiator of the protocol thus we will wait for initiation from
1195 there before we start the protocol. */
1196 server->stat.auth_attempts++;
1197 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1198 &sock->protocol, proto_ctx,
1199 silc_server_accept_new_connection_second);
1201 /* Register a timeout task that will be executed if the connector
1202 will not start the key exchange protocol within specified timeout
1203 and the connection will be closed. */
1204 proto_ctx->timeout_task =
1205 silc_schedule_task_add(server->schedule, sock->sock,
1206 silc_server_timeout_remote,
1207 context, server->config->key_exchange_timeout, 0,
1212 /* Accepts new connections to the server. Accepting new connections are
1213 done in three parts to make it async. */
1215 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
1217 SilcServer server = (SilcServer)context;
1218 SilcSocketConnection newsocket;
1221 SILC_LOG_DEBUG(("Accepting new connection"));
1223 server->stat.conn_attempts++;
1225 sock = silc_net_accept_connection(server->sock);
1227 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
1228 server->stat.conn_failures++;
1232 /* Check for maximum allowed connections */
1233 if (sock > server->config->param.connections_max) {
1234 SILC_LOG_ERROR(("Refusing connection, server is full"));
1235 server->stat.conn_failures++;
1236 silc_net_close_connection(sock);
1240 /* Set socket options */
1241 silc_net_set_socket_nonblock(sock);
1242 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
1244 /* We don't create a ID yet, since we don't know what type of connection
1245 this is yet. But, we do add the connection to the socket table. */
1246 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
1247 server->sockets[sock] = newsocket;
1249 /* Perform asynchronous host lookup. This will lookup the IP and the
1250 FQDN of the remote connection. After the lookup is done the connection
1251 is accepted further. */
1252 silc_socket_host_lookup(newsocket, TRUE,
1253 silc_server_accept_new_connection_lookup, context,
1257 /* Second part of accepting new connection. Key exchange protocol has been
1258 performed and now it is time to do little connection authentication
1259 protocol to figure out whether this connection is client or server
1260 and whether it has right to access this server (especially server
1261 connections needs to be authenticated). */
1263 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1265 SilcProtocol protocol = (SilcProtocol)context;
1266 SilcServerKEInternalContext *ctx =
1267 (SilcServerKEInternalContext *)protocol->context;
1268 SilcServer server = (SilcServer)ctx->server;
1269 SilcSocketConnection sock = ctx->sock;
1270 SilcServerConnAuthInternalContext *proto_ctx;
1272 SILC_LOG_DEBUG(("Start"));
1274 if ((protocol->state == SILC_PROTOCOL_STATE_ERROR) ||
1275 (protocol->state == SILC_PROTOCOL_STATE_FAILURE)) {
1276 /* Error occured during protocol */
1277 silc_protocol_free(protocol);
1278 sock->protocol = NULL;
1279 silc_ske_free_key_material(ctx->keymat);
1281 silc_packet_context_free(ctx->packet);
1283 silc_ske_free(ctx->ske);
1284 silc_free(ctx->dest_id);
1285 silc_server_config_unref(&ctx->cconfig);
1286 silc_server_config_unref(&ctx->sconfig);
1287 silc_server_config_unref(&ctx->rconfig);
1289 silc_schedule_task_del_by_callback(server->schedule,
1290 silc_server_failure_callback);
1291 silc_server_disconnect_remote(server, sock,
1292 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
1294 server->stat.auth_failures++;
1298 /* We now have the key material as the result of the key exchange
1299 protocol. Take the key material into use. Free the raw key material
1300 as soon as we've set them into use. */
1301 if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1302 ctx->sock, ctx->keymat,
1303 ctx->ske->prop->cipher,
1304 ctx->ske->prop->pkcs,
1305 ctx->ske->prop->hash,
1306 ctx->ske->prop->hmac,
1307 ctx->ske->prop->group,
1309 silc_protocol_free(protocol);
1310 sock->protocol = NULL;
1311 silc_ske_free_key_material(ctx->keymat);
1313 silc_packet_context_free(ctx->packet);
1315 silc_ske_free(ctx->ske);
1316 silc_free(ctx->dest_id);
1317 silc_server_config_unref(&ctx->cconfig);
1318 silc_server_config_unref(&ctx->sconfig);
1319 silc_server_config_unref(&ctx->rconfig);
1321 silc_schedule_task_del_by_callback(server->schedule,
1322 silc_server_failure_callback);
1323 silc_server_disconnect_remote(server, sock,
1324 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1325 server->stat.auth_failures++;
1328 silc_ske_free_key_material(ctx->keymat);
1330 /* Allocate internal context for the authentication protocol. This
1331 is sent as context for the protocol. */
1332 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1333 proto_ctx->server = (void *)server;
1334 proto_ctx->sock = sock;
1335 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
1336 proto_ctx->responder = TRUE;
1337 proto_ctx->dest_id_type = ctx->dest_id_type;
1338 proto_ctx->dest_id = ctx->dest_id;
1339 proto_ctx->cconfig = ctx->cconfig;
1340 proto_ctx->sconfig = ctx->sconfig;
1341 proto_ctx->rconfig = ctx->rconfig;
1343 /* Free old protocol as it is finished now */
1344 silc_protocol_free(protocol);
1346 silc_packet_context_free(ctx->packet);
1348 sock->protocol = NULL;
1350 /* Allocate the authentication protocol. This is allocated here
1351 but we won't start it yet. We will be receiving party of this
1352 protocol thus we will wait that connecting party will make
1353 their first move. */
1354 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1355 &sock->protocol, proto_ctx,
1356 silc_server_accept_new_connection_final);
1358 /* Register timeout task. If the protocol is not executed inside
1359 this timelimit the connection will be terminated. */
1360 proto_ctx->timeout_task =
1361 silc_schedule_task_add(server->schedule, sock->sock,
1362 silc_server_timeout_remote,
1364 server->config->conn_auth_timeout, 0,
1369 /* Final part of accepting new connection. The connection has now
1370 been authenticated and keys has been exchanged. We also know whether
1371 this is client or server connection. */
1373 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1375 SilcProtocol protocol = (SilcProtocol)context;
1376 SilcServerConnAuthInternalContext *ctx =
1377 (SilcServerConnAuthInternalContext *)protocol->context;
1378 SilcServer server = (SilcServer)ctx->server;
1379 SilcSocketConnection sock = ctx->sock;
1380 SilcServerHBContext hb_context;
1381 SilcUnknownEntry entry = (SilcUnknownEntry)sock->user_data;
1383 SilcUInt32 hearbeat_timeout = server->config->param.keepalive_secs;
1385 SILC_LOG_DEBUG(("Start"));
1387 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1388 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1389 /* Error occured during protocol */
1390 silc_protocol_free(protocol);
1391 sock->protocol = NULL;
1393 silc_packet_context_free(ctx->packet);
1395 silc_ske_free(ctx->ske);
1396 silc_free(ctx->dest_id);
1397 silc_server_config_unref(&ctx->cconfig);
1398 silc_server_config_unref(&ctx->sconfig);
1399 silc_server_config_unref(&ctx->rconfig);
1401 silc_schedule_task_del_by_callback(server->schedule,
1402 silc_server_failure_callback);
1403 silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1405 server->stat.auth_failures++;
1409 entry->data.last_receive = time(NULL);
1411 switch (ctx->conn_type) {
1412 case SILC_SOCKET_TYPE_CLIENT:
1414 SilcClientEntry client;
1415 SilcServerConfigClient *conn = ctx->cconfig.ref_ptr;
1417 /* Verify whether this connection is after all allowed to connect */
1418 if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1419 &server->config->param,
1420 conn->param, ctx->ske)) {
1421 server->stat.auth_failures++;
1425 SILC_LOG_DEBUG(("Remote host is client"));
1426 SILC_LOG_INFO(("Connection %s (%s) is client", sock->hostname,
1429 /* Add the client to the client ID cache. The nickname and Client ID
1430 and other information is created after we have received NEW_CLIENT
1431 packet from client. */
1432 client = silc_idlist_add_client(server->local_list,
1433 NULL, NULL, NULL, NULL, NULL, sock, 0);
1435 SILC_LOG_ERROR(("Could not add new client to cache"));
1436 silc_free(sock->user_data);
1437 silc_server_disconnect_remote(server, sock,
1438 SILC_STATUS_ERR_AUTH_FAILED, NULL);
1439 server->stat.auth_failures++;
1444 server->stat.my_clients++;
1445 server->stat.clients++;
1446 server->stat.cell_clients++;
1448 /* Get connection parameters */
1450 if (conn->param->keepalive_secs)
1451 hearbeat_timeout = conn->param->keepalive_secs;
1454 id_entry = (void *)client;
1457 case SILC_SOCKET_TYPE_SERVER:
1458 case SILC_SOCKET_TYPE_ROUTER:
1460 SilcServerEntry new_server;
1461 bool initiator = FALSE;
1462 bool backup_local = FALSE;
1463 bool backup_router = FALSE;
1464 char *backup_replace_ip = NULL;
1465 SilcUInt16 backup_replace_port = 0;
1466 SilcServerConfigServer *sconn = ctx->sconfig.ref_ptr;
1467 SilcServerConfigRouter *rconn = ctx->rconfig.ref_ptr;
1469 if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
1470 /* Verify whether this connection is after all allowed to connect */
1471 if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1472 &server->config->param,
1473 rconn ? rconn->param : NULL,
1475 server->stat.auth_failures++;
1481 if (rconn->param->keepalive_secs)
1482 hearbeat_timeout = rconn->param->keepalive_secs;
1485 initiator = rconn->initiator;
1486 backup_local = rconn->backup_local;
1487 backup_router = rconn->backup_router;
1488 backup_replace_ip = rconn->backup_replace_ip;
1489 backup_replace_port = rconn->backup_replace_port;
1493 if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
1494 /* Verify whether this connection is after all allowed to connect */
1495 if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1496 &server->config->param,
1497 sconn ? sconn->param : NULL,
1499 server->stat.auth_failures++;
1504 if (sconn->param->keepalive_secs)
1505 hearbeat_timeout = sconn->param->keepalive_secs;
1508 backup_router = sconn->backup_router;
1512 SILC_LOG_DEBUG(("Remote host is %s",
1513 ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1514 "server" : (backup_router ?
1515 "backup router" : "router")));
1516 SILC_LOG_INFO(("Connection %s (%s) is %s", sock->hostname,
1517 sock->ip, ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1518 "server" : (backup_router ?
1519 "backup router" : "router")));
1521 /* Add the server into server cache. The server name and Server ID
1522 is updated after we have received NEW_SERVER packet from the
1523 server. We mark ourselves as router for this server if we really
1526 silc_idlist_add_server((ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1527 server->local_list : (backup_router ?
1528 server->local_list :
1529 server->global_list)),
1531 (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1532 SILC_SERVER : SILC_ROUTER),
1534 (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1535 server->id_entry : (backup_router ?
1536 server->id_entry : NULL)),
1539 SILC_LOG_ERROR(("Could not add new server to cache"));
1540 silc_free(sock->user_data);
1541 silc_server_disconnect_remote(server, sock,
1542 SILC_STATUS_ERR_AUTH_FAILED, NULL);
1543 server->stat.auth_failures++;
1548 if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER)
1549 server->stat.my_servers++;
1551 server->stat.my_routers++;
1552 server->stat.servers++;
1554 id_entry = (void *)new_server;
1556 /* If the incoming connection is router and marked as backup router
1557 then add it to be one of our backups */
1558 if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER && backup_router) {
1559 silc_server_backup_add(server, new_server, backup_replace_ip,
1560 backup_replace_port, backup_local);
1562 /* Change it back to SERVER type since that's what it really is. */
1564 ctx->conn_type = SILC_SOCKET_TYPE_SERVER;
1566 new_server->server_type = SILC_BACKUP_ROUTER;
1569 /* Check whether this connection is to be our primary router connection
1570 if we do not already have the primary route. */
1571 if (server->standalone && ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
1572 if (silc_server_config_is_primary_route(server) && !initiator)
1575 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1576 server->standalone = FALSE;
1577 if (!server->id_entry->router) {
1578 server->id_entry->router = id_entry;
1579 server->router = id_entry;
1590 sock->type = ctx->conn_type;
1592 /* Add the common data structure to the ID entry. */
1593 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1595 /* Add to sockets internal pointer for fast referencing */
1596 silc_free(sock->user_data);
1597 sock->user_data = id_entry;
1599 /* Connection has been fully established now. Everything is ok. */
1600 SILC_LOG_DEBUG(("New connection authenticated"));
1602 /* Perform keepalive. The `hb_context' will be freed automatically
1603 when finally calling the silc_socket_free function. */
1604 hb_context = silc_calloc(1, sizeof(*hb_context));
1605 hb_context->server = server;
1606 silc_socket_set_heartbeat(sock, hearbeat_timeout, hb_context,
1607 silc_server_perform_heartbeat,
1611 silc_schedule_task_del_by_callback(server->schedule,
1612 silc_server_failure_callback);
1613 silc_protocol_free(protocol);
1615 silc_packet_context_free(ctx->packet);
1617 silc_ske_free(ctx->ske);
1618 silc_free(ctx->dest_id);
1619 silc_server_config_unref(&ctx->cconfig);
1620 silc_server_config_unref(&ctx->sconfig);
1621 silc_server_config_unref(&ctx->rconfig);
1623 sock->protocol = NULL;
1626 /* This function is used to read packets from network and send packets to
1627 network. This is usually a generic task. */
1629 SILC_TASK_CALLBACK(silc_server_packet_process)
1631 SilcServer server = (SilcServer)context;
1632 SilcSocketConnection sock = server->sockets[fd];
1633 SilcIDListData idata;
1634 SilcCipher cipher = NULL;
1635 SilcHmac hmac = NULL;
1636 SilcUInt32 sequence = 0;
1642 SILC_LOG_DEBUG(("Processing packet"));
1644 /* Packet sending */
1646 if (type == SILC_TASK_WRITE) {
1647 /* Do not send data to disconnected connection */
1648 if (SILC_IS_DISCONNECTED(sock))
1651 server->stat.packets_sent++;
1653 /* Send the packet */
1654 ret = silc_packet_send(sock, TRUE);
1656 /* If returned -2 could not write to connection now, will do
1662 SILC_LOG_ERROR(("Error sending packet to connection "
1663 "%s:%d [%s]", sock->hostname, sock->port,
1664 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
1665 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
1666 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
1671 /* The packet has been sent and now it is time to set the connection
1672 back to only for input. When there is again some outgoing data
1673 available for this connection it will be set for output as well.
1674 This call clears the output setting and sets it only for input. */
1675 SILC_SET_CONNECTION_FOR_INPUT(server->schedule, fd);
1676 SILC_UNSET_OUTBUF_PENDING(sock);
1678 silc_buffer_clear(sock->outbuf);
1682 /* Packet receiving */
1684 /* Read some data from connection */
1685 ret = silc_packet_receive(sock);
1689 SILC_LOG_ERROR(("Error receiving packet from connection "
1690 "%s:%d [%s] %s", sock->hostname, sock->port,
1691 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
1692 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
1693 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
1694 "Router"), strerror(errno)));
1700 SILC_LOG_DEBUG(("Read EOF"));
1702 /* If connection is disconnecting already we will finally
1703 close the connection */
1704 if (SILC_IS_DISCONNECTING(sock)) {
1705 if (sock->user_data)
1706 silc_server_free_sock_user_data(server, sock, NULL);
1707 silc_server_close_connection(server, sock);
1711 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1712 SILC_SET_DISCONNECTING(sock);
1714 if (sock->user_data) {
1716 if (silc_socket_get_error(sock, tmp, sizeof(tmp) - 1))
1717 silc_server_free_sock_user_data(server, sock, tmp);
1719 silc_server_free_sock_user_data(server, sock, NULL);
1720 } else if (server->router_conn && server->router_conn->sock == sock &&
1721 !server->router && server->standalone)
1722 silc_schedule_task_add(server->schedule, 0,
1723 silc_server_connect_to_router,
1726 SILC_TASK_PRI_NORMAL);
1728 silc_server_close_connection(server, sock);
1732 /* If connection is disconnecting or disconnected we will ignore
1734 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1735 SILC_LOG_DEBUG(("Ignoring read data from disconnected connection"));
1739 server->stat.packets_received++;
1741 /* Get keys and stuff from ID entry */
1742 idata = (SilcIDListData)sock->user_data;
1744 cipher = idata->receive_key;
1745 hmac = idata->hmac_receive;
1746 sequence = idata->psn_receive;
1749 /* Process the packet. This will call the parser that will then
1750 decrypt and parse the packet. */
1751 ret = silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
1752 TRUE : FALSE, cipher, hmac, sequence,
1753 silc_server_packet_parse, server);
1755 /* If this socket connection is not authenticated yet and the packet
1756 processing failed we will drop the connection since it can be
1757 a malicious flooder. */
1758 if (sock->type == SILC_SOCKET_TYPE_UNKNOWN && ret == FALSE &&
1759 (!sock->protocol || sock->protocol->protocol->type ==
1760 SILC_PROTOCOL_SERVER_KEY_EXCHANGE)) {
1761 SILC_LOG_DEBUG(("Bad data sent from unknown connection %d", sock->sock));
1762 SILC_SET_DISCONNECTING(sock);
1764 if (sock->user_data)
1765 silc_server_free_sock_user_data(server, sock, NULL);
1766 silc_server_close_connection(server, sock);
1770 /* Parses whole packet, received earlier. */
1772 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1774 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1775 SilcServer server = (SilcServer)parse_ctx->context;
1776 SilcSocketConnection sock = parse_ctx->sock;
1777 SilcPacketContext *packet = parse_ctx->packet;
1778 SilcIDListData idata = (SilcIDListData)sock->user_data;
1781 SILC_LOG_DEBUG(("Start"));
1783 /* Parse the packet */
1784 if (parse_ctx->normal)
1785 ret = silc_packet_parse(packet, idata ? idata->receive_key : NULL);
1787 ret = silc_packet_parse_special(packet, idata ? idata->receive_key : NULL);
1789 /* If entry is disabled ignore what we got. */
1790 if (ret != SILC_PACKET_RESUME_ROUTER &&
1791 idata && idata->status & SILC_IDLIST_STATUS_DISABLED) {
1792 SILC_LOG_DEBUG(("Connection is disabled"));
1796 if (ret == SILC_PACKET_NONE)
1799 /* Check that the the current client ID is same as in the client's packet. */
1800 if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
1801 SilcClientEntry client = (SilcClientEntry)sock->user_data;
1802 if (client && client->id) {
1803 void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
1804 packet->src_id_type);
1805 if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
1813 if (server->server_type == SILC_ROUTER) {
1814 /* Route the packet if it is not destined to us. Other ID types but
1815 server are handled separately after processing them. */
1816 if (!(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
1817 packet->dst_id_type == SILC_ID_SERVER &&
1818 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1819 memcmp(packet->dst_id, server->id_string, server->id_string_len)) {
1821 /* Route the packet to fastest route for the destination ID */
1822 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
1823 packet->dst_id_type);
1826 silc_server_packet_route(server,
1827 silc_server_route_get(server, id,
1828 packet->dst_id_type),
1835 /* Parse the incoming packet type */
1836 silc_server_packet_parse_type(server, sock, packet);
1838 if (server->server_type == SILC_ROUTER) {
1839 /* Broadcast packet if it is marked as broadcast packet and it is
1840 originated from router and we are router. */
1841 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1842 packet->flags & SILC_PACKET_FLAG_BROADCAST &&
1843 !server->standalone) {
1844 /* Broadcast to our primary route */
1845 silc_server_packet_broadcast(server, server->router->connection, packet);
1847 /* If we have backup routers then we need to feed all broadcast
1848 data to those servers. */
1849 silc_server_backup_broadcast(server, sock, packet);
1854 silc_packet_context_free(packet);
1855 silc_free(parse_ctx);
1858 /* Parser callback called by silc_packet_receive_process. This merely
1859 registers timeout that will handle the actual parsing when appropriate. */
1861 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
1864 SilcServer server = (SilcServer)context;
1865 SilcSocketConnection sock = parser_context->sock;
1866 SilcIDListData idata = (SilcIDListData)sock->user_data;
1869 idata->psn_receive = parser_context->packet->sequence + 1;
1871 /* If protocol for this connection is key exchange or rekey then we'll
1872 process all packets synchronously, since there might be packets in
1873 queue that we are not able to decrypt without first processing the
1874 packets before them. */
1875 if ((parser_context->packet->type == SILC_PACKET_REKEY ||
1876 parser_context->packet->type == SILC_PACKET_REKEY_DONE) ||
1877 (sock->protocol && sock->protocol->protocol &&
1878 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1879 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY))) {
1880 silc_server_packet_parse_real(server->schedule, 0, sock->sock,
1883 /* Reprocess data since we'll return FALSE here. This is because
1884 the idata->receive_key might have become valid in the last packet
1885 and we want to call this processor with valid cipher. */
1887 silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
1888 TRUE : FALSE, idata->receive_key,
1889 idata->hmac_receive, idata->psn_receive,
1890 silc_server_packet_parse, server);
1892 silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
1893 TRUE : FALSE, NULL, NULL, 0,
1894 silc_server_packet_parse, server);
1898 switch (sock->type) {
1899 case SILC_SOCKET_TYPE_UNKNOWN:
1900 case SILC_SOCKET_TYPE_CLIENT:
1901 /* Parse the packet with timeout */
1902 silc_schedule_task_add(server->schedule, sock->sock,
1903 silc_server_packet_parse_real,
1904 (void *)parser_context, 0, 100000,
1906 SILC_TASK_PRI_NORMAL);
1908 case SILC_SOCKET_TYPE_SERVER:
1909 case SILC_SOCKET_TYPE_ROUTER:
1910 /* Packets from servers are parsed immediately */
1911 silc_server_packet_parse_real(server->schedule, 0, sock->sock,
1921 /* Parses the packet type and calls what ever routines the packet type
1922 requires. This is done for all incoming packets. */
1924 void silc_server_packet_parse_type(SilcServer server,
1925 SilcSocketConnection sock,
1926 SilcPacketContext *packet)
1928 SilcPacketType type = packet->type;
1929 SilcIDListData idata = (SilcIDListData)sock->user_data;
1931 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1933 /* Parse the packet type */
1935 case SILC_PACKET_DISCONNECT:
1938 char *message = NULL;
1940 SILC_LOG_DEBUG(("Disconnect packet"));
1942 if (packet->flags & SILC_PACKET_FLAG_LIST)
1944 if (packet->buffer->len < 1)
1947 status = (SilcStatus)packet->buffer->data[0];
1948 if (packet->buffer->len > 1 &&
1949 silc_utf8_valid(packet->buffer->data + 1, packet->buffer->len - 1))
1950 message = silc_memdup(packet->buffer->data, packet->buffer->len);
1952 SILC_LOG_ERROR(("Disconnected by %s (%s): %s (%d) %s",
1953 sock->ip, sock->hostname,
1954 silc_get_status_message(status), status,
1955 message ? message : ""));
1960 case SILC_PACKET_SUCCESS:
1962 * Success received for something. For now we can have only
1963 * one protocol for connection executing at once hence this
1964 * success message is for whatever protocol is executing currently.
1966 SILC_LOG_DEBUG(("Success packet"));
1967 if (packet->flags & SILC_PACKET_FLAG_LIST)
1970 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
1973 case SILC_PACKET_FAILURE:
1975 * Failure received for something. For now we can have only
1976 * one protocol for connection executing at once hence this
1977 * failure message is for whatever protocol is executing currently.
1979 SILC_LOG_DEBUG(("Failure packet"));
1980 if (packet->flags & SILC_PACKET_FLAG_LIST)
1982 if (sock->protocol) {
1983 SilcServerFailureContext f;
1984 f = silc_calloc(1, sizeof(*f));
1988 /* We will wait 5 seconds to process this failure packet */
1989 silc_schedule_task_add(server->schedule, sock->sock,
1990 silc_server_failure_callback, (void *)f, 5, 0,
1991 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1995 case SILC_PACKET_REJECT:
1996 SILC_LOG_DEBUG(("Reject packet"));
1997 if (packet->flags & SILC_PACKET_FLAG_LIST)
2002 case SILC_PACKET_NOTIFY:
2004 * Received notify packet. Server can receive notify packets from
2005 * router. Server then relays the notify messages to clients if needed.
2007 SILC_LOG_DEBUG(("Notify packet"));
2008 if (packet->flags & SILC_PACKET_FLAG_LIST)
2009 silc_server_notify_list(server, sock, packet);
2011 silc_server_notify(server, sock, packet);
2017 case SILC_PACKET_CHANNEL_MESSAGE:
2019 * Received channel message. Channel messages are special packets
2020 * (although probably most common ones) thus they are handled
2023 SILC_LOG_DEBUG(("Channel Message packet"));
2024 if (packet->flags & SILC_PACKET_FLAG_LIST)
2026 idata->last_receive = time(NULL);
2027 silc_server_channel_message(server, sock, packet);
2030 case SILC_PACKET_CHANNEL_KEY:
2032 * Received key for channel. As channels are created by the router
2033 * the keys are as well. We will distribute the key to all of our
2034 * locally connected clients on the particular channel. Router
2035 * never receives this channel and thus is ignored.
2037 SILC_LOG_DEBUG(("Channel Key packet"));
2038 if (packet->flags & SILC_PACKET_FLAG_LIST)
2040 silc_server_channel_key(server, sock, packet);
2046 case SILC_PACKET_COMMAND:
2048 * Recived command. Processes the command request and allocates the
2049 * command context and calls the command.
2051 SILC_LOG_DEBUG(("Command packet"));
2052 if (packet->flags & SILC_PACKET_FLAG_LIST)
2054 silc_server_command_process(server, sock, packet);
2057 case SILC_PACKET_COMMAND_REPLY:
2059 * Received command reply packet. Received command reply to command. It
2060 * may be reply to command sent by us or reply to command sent by client
2061 * that we've routed further.
2063 SILC_LOG_DEBUG(("Command Reply packet"));
2064 if (packet->flags & SILC_PACKET_FLAG_LIST)
2066 silc_server_command_reply(server, sock, packet);
2070 * Private Message packets
2072 case SILC_PACKET_PRIVATE_MESSAGE:
2074 * Received private message packet. The packet is coming from either
2077 SILC_LOG_DEBUG(("Private Message packet"));
2078 if (packet->flags & SILC_PACKET_FLAG_LIST)
2080 idata->last_receive = time(NULL);
2081 silc_server_private_message(server, sock, packet);
2084 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
2086 * Private message key packet.
2088 if (packet->flags & SILC_PACKET_FLAG_LIST)
2090 silc_server_private_message_key(server, sock, packet);
2094 * Key Exchange protocol packets
2096 case SILC_PACKET_KEY_EXCHANGE:
2097 SILC_LOG_DEBUG(("KE packet"));
2098 if (packet->flags & SILC_PACKET_FLAG_LIST)
2101 if (sock->protocol && sock->protocol->protocol &&
2102 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
2103 SilcServerKEInternalContext *proto_ctx =
2104 (SilcServerKEInternalContext *)sock->protocol->context;
2106 proto_ctx->packet = silc_packet_context_dup(packet);
2108 /* Let the protocol handle the packet */
2109 silc_protocol_execute(sock->protocol, server->schedule, 0, 100000);
2111 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
2112 "protocol active, packet dropped."));
2116 case SILC_PACKET_KEY_EXCHANGE_1:
2117 SILC_LOG_DEBUG(("KE 1 packet"));
2118 if (packet->flags & SILC_PACKET_FLAG_LIST)
2121 if (sock->protocol && sock->protocol->protocol &&
2122 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2123 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2125 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2126 SilcServerRekeyInternalContext *proto_ctx =
2127 (SilcServerRekeyInternalContext *)sock->protocol->context;
2129 if (proto_ctx->packet)
2130 silc_packet_context_free(proto_ctx->packet);
2132 proto_ctx->packet = silc_packet_context_dup(packet);
2134 /* Let the protocol handle the packet */
2135 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2137 SilcServerKEInternalContext *proto_ctx =
2138 (SilcServerKEInternalContext *)sock->protocol->context;
2140 if (proto_ctx->packet)
2141 silc_packet_context_free(proto_ctx->packet);
2143 proto_ctx->packet = silc_packet_context_dup(packet);
2144 proto_ctx->dest_id_type = packet->src_id_type;
2145 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2146 packet->src_id_type);
2147 if (!proto_ctx->dest_id)
2150 /* Let the protocol handle the packet */
2151 silc_protocol_execute(sock->protocol, server->schedule,
2155 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
2156 "protocol active, packet dropped."));
2160 case SILC_PACKET_KEY_EXCHANGE_2:
2161 SILC_LOG_DEBUG(("KE 2 packet"));
2162 if (packet->flags & SILC_PACKET_FLAG_LIST)
2165 if (sock->protocol && sock->protocol->protocol &&
2166 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2167 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2169 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2170 SilcServerRekeyInternalContext *proto_ctx =
2171 (SilcServerRekeyInternalContext *)sock->protocol->context;
2173 if (proto_ctx->packet)
2174 silc_packet_context_free(proto_ctx->packet);
2176 proto_ctx->packet = silc_packet_context_dup(packet);
2178 /* Let the protocol handle the packet */
2179 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2181 SilcServerKEInternalContext *proto_ctx =
2182 (SilcServerKEInternalContext *)sock->protocol->context;
2184 if (proto_ctx->packet)
2185 silc_packet_context_free(proto_ctx->packet);
2187 proto_ctx->packet = silc_packet_context_dup(packet);
2188 proto_ctx->dest_id_type = packet->src_id_type;
2189 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2190 packet->src_id_type);
2191 if (!proto_ctx->dest_id)
2194 /* Let the protocol handle the packet */
2195 silc_protocol_execute(sock->protocol, server->schedule,
2199 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
2200 "protocol active, packet dropped."));
2204 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
2206 * Connection authentication request packet. When we receive this packet
2207 * we will send to the other end information about our mandatory
2208 * authentication method for the connection. This packet maybe received
2211 SILC_LOG_DEBUG(("Connection authentication request packet"));
2212 if (packet->flags & SILC_PACKET_FLAG_LIST)
2214 silc_server_connection_auth_request(server, sock, packet);
2218 * Connection Authentication protocol packets
2220 case SILC_PACKET_CONNECTION_AUTH:
2221 /* Start of the authentication protocol. We receive here the
2222 authentication data and will verify it. */
2223 SILC_LOG_DEBUG(("Connection auth packet"));
2224 if (packet->flags & SILC_PACKET_FLAG_LIST)
2227 if (sock->protocol && sock->protocol->protocol->type
2228 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
2230 SilcServerConnAuthInternalContext *proto_ctx =
2231 (SilcServerConnAuthInternalContext *)sock->protocol->context;
2233 proto_ctx->packet = silc_packet_context_dup(packet);
2235 /* Let the protocol handle the packet */
2236 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2238 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
2239 "protocol active, packet dropped."));
2243 case SILC_PACKET_NEW_ID:
2245 * Received New ID packet. This includes some new ID that has been
2246 * created. It may be for client, server or channel. This is the way
2247 * to distribute information about new registered entities in the
2250 SILC_LOG_DEBUG(("New ID packet"));
2251 if (packet->flags & SILC_PACKET_FLAG_LIST)
2252 silc_server_new_id_list(server, sock, packet);
2254 silc_server_new_id(server, sock, packet);
2257 case SILC_PACKET_NEW_CLIENT:
2259 * Received new client packet. This includes client information that
2260 * we will use to create initial client ID. After creating new
2261 * ID we will send it to the client.
2263 SILC_LOG_DEBUG(("New Client packet"));
2264 if (packet->flags & SILC_PACKET_FLAG_LIST)
2266 silc_server_new_client(server, sock, packet);
2269 case SILC_PACKET_NEW_SERVER:
2271 * Received new server packet. This includes Server ID and some other
2272 * information that we may save. This is received after server has
2275 SILC_LOG_DEBUG(("New Server packet"));
2276 if (packet->flags & SILC_PACKET_FLAG_LIST)
2278 silc_server_new_server(server, sock, packet);
2281 case SILC_PACKET_NEW_CHANNEL:
2283 * Received new channel packet. Information about new channel in the
2284 * network are distributed using this packet.
2286 SILC_LOG_DEBUG(("New Channel packet"));
2287 if (packet->flags & SILC_PACKET_FLAG_LIST)
2288 silc_server_new_channel_list(server, sock, packet);
2290 silc_server_new_channel(server, sock, packet);
2293 case SILC_PACKET_HEARTBEAT:
2295 * Received heartbeat.
2297 SILC_LOG_DEBUG(("Heartbeat packet"));
2298 if (packet->flags & SILC_PACKET_FLAG_LIST)
2302 case SILC_PACKET_KEY_AGREEMENT:
2304 * Received heartbeat.
2306 SILC_LOG_DEBUG(("Key agreement packet"));
2307 if (packet->flags & SILC_PACKET_FLAG_LIST)
2309 silc_server_key_agreement(server, sock, packet);
2312 case SILC_PACKET_REKEY:
2314 * Received re-key packet. The sender wants to regenerate the session
2317 SILC_LOG_DEBUG(("Re-key packet"));
2318 if (packet->flags & SILC_PACKET_FLAG_LIST)
2320 silc_server_rekey(server, sock, packet);
2323 case SILC_PACKET_REKEY_DONE:
2325 * The re-key is done.
2327 SILC_LOG_DEBUG(("Re-key done packet"));
2328 if (packet->flags & SILC_PACKET_FLAG_LIST)
2331 if (sock->protocol && sock->protocol->protocol &&
2332 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2334 SilcServerRekeyInternalContext *proto_ctx =
2335 (SilcServerRekeyInternalContext *)sock->protocol->context;
2337 if (proto_ctx->packet)
2338 silc_packet_context_free(proto_ctx->packet);
2340 proto_ctx->packet = silc_packet_context_dup(packet);
2342 /* Let the protocol handle the packet */
2343 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2345 SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2346 "protocol active, packet dropped."));
2350 case SILC_PACKET_FTP:
2352 SILC_LOG_DEBUG(("FTP packet"));
2353 if (packet->flags & SILC_PACKET_FLAG_LIST)
2355 silc_server_ftp(server, sock, packet);
2358 case SILC_PACKET_RESUME_CLIENT:
2360 SILC_LOG_DEBUG(("Resume Client packet"));
2361 if (packet->flags & SILC_PACKET_FLAG_LIST)
2363 silc_server_resume_client(server, sock, packet);
2366 case SILC_PACKET_RESUME_ROUTER:
2367 /* Resume router packet received. This packet is received for backup
2368 router resuming protocol. */
2369 SILC_LOG_DEBUG(("Resume router packet"));
2370 if (packet->flags & SILC_PACKET_FLAG_LIST)
2372 silc_server_backup_resume_router(server, sock, packet);
2376 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2382 /* Creates connection to a remote router. */
2384 void silc_server_create_connection(SilcServer server,
2385 const char *remote_host, SilcUInt32 port)
2387 SilcServerConnection sconn;
2389 /* Allocate connection object for hold connection specific stuff. */
2390 sconn = silc_calloc(1, sizeof(*sconn));
2391 sconn->server = server;
2392 sconn->remote_host = strdup(remote_host);
2393 sconn->remote_port = port;
2394 sconn->no_reconnect = TRUE;
2396 silc_schedule_task_add(server->schedule, 0,
2397 silc_server_connect_router,
2398 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2399 SILC_TASK_PRI_NORMAL);
2402 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2404 silc_socket_free((SilcSocketConnection)context);
2407 /* Closes connection to socket connection */
2409 void silc_server_close_connection(SilcServer server,
2410 SilcSocketConnection sock)
2412 if (!server->sockets[sock->sock])
2415 SILC_LOG_INFO(("Closing connection %s:%d [%s]", sock->hostname,
2417 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2418 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2419 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2422 /* We won't listen for this connection anymore */
2423 silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2425 /* Unregister all tasks */
2426 silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2428 /* Close the actual connection */
2429 silc_net_close_connection(sock->sock);
2430 server->sockets[sock->sock] = NULL;
2432 /* If sock->user_data is NULL then we'll check for active protocols
2433 here since the silc_server_free_sock_user_data has not been called
2434 for this connection. */
2435 if (!sock->user_data) {
2436 /* If any protocol is active cancel its execution. It will call
2437 the final callback which will finalize the disconnection. */
2438 if (sock->protocol) {
2439 silc_protocol_cancel(sock->protocol, server->schedule);
2440 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2441 silc_protocol_execute_final(sock->protocol, server->schedule);
2442 sock->protocol = NULL;
2447 silc_schedule_task_add(server->schedule, 0,
2448 silc_server_close_connection_final,
2449 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2450 SILC_TASK_PRI_NORMAL);
2453 /* Sends disconnect message to remote connection and disconnects the
2456 void silc_server_disconnect_remote(SilcServer server,
2457 SilcSocketConnection sock,
2458 SilcStatus status, ...)
2461 unsigned char buf[512];
2469 memset(buf, 0, sizeof(buf));
2470 va_start(ap, status);
2471 cp = va_arg(ap, char *);
2473 vsnprintf(buf, sizeof(buf) - 1, cp, ap);
2478 SILC_LOG_DEBUG(("Disconnecting remote host"));
2480 /* Notify remote end that the conversation is over. The notify message
2481 is tried to be sent immediately. */
2485 len += silc_utf8_encoded_len(buf, strlen(buf), SILC_STRING_ASCII);
2487 buffer = silc_buffer_alloc_size(len);
2491 buffer->data[0] = status;
2493 silc_utf8_encode(buf, strlen(buf), SILC_STRING_ASCII, buffer->data + 1,
2495 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
2496 buffer->data, buffer->len, TRUE);
2497 silc_buffer_free(buffer);
2500 silc_server_packet_queue_purge(server, sock);
2502 /* Mark the connection to be disconnected */
2503 SILC_SET_DISCONNECTED(sock);
2504 silc_server_close_connection(server, sock);
2509 SilcClientEntry client;
2510 } *FreeClientInternal;
2512 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2514 FreeClientInternal i = (FreeClientInternal)context;
2516 silc_idlist_del_data(i->client);
2517 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2521 /* Frees client data and notifies about client's signoff. */
2523 void silc_server_free_client_data(SilcServer server,
2524 SilcSocketConnection sock,
2525 SilcClientEntry client,
2527 const char *signoff)
2529 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2531 /* If there is pending outgoing data for the client then purge it
2532 to the network before removing the client entry. */
2533 silc_server_packet_queue_purge(server, sock);
2536 /* Send SIGNOFF notify to routers. */
2537 if (notify && !server->standalone && server->router)
2538 silc_server_send_notify_signoff(server, server->router->connection,
2539 server->server_type == SILC_SERVER ?
2540 FALSE : TRUE, client->id, signoff);
2542 /* Remove client from all channels */
2544 silc_server_remove_from_channels(server, NULL, client,
2545 TRUE, (char *)signoff, TRUE);
2547 silc_server_remove_from_channels(server, NULL, client,
2548 FALSE, NULL, FALSE);
2550 /* Check if anyone is watching this nickname */
2551 if (server->server_type == SILC_ROUTER)
2552 silc_server_check_watcher_list(server, client, NULL,
2553 SILC_NOTIFY_TYPE_SIGNOFF);
2555 /* Remove this client from watcher list if it is */
2556 silc_server_del_from_watcher_list(server, client);
2559 /* Update statistics */
2560 server->stat.my_clients--;
2561 server->stat.clients--;
2562 if (server->stat.cell_clients)
2563 server->stat.cell_clients--;
2564 SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
2565 SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
2566 silc_schedule_task_del_by_context(server->schedule, client);
2568 /* We will not delete the client entry right away. We will take it
2569 into history (for WHOWAS command) for 5 minutes */
2572 silc_schedule_task_add(server->schedule, 0,
2573 silc_server_free_client_data_timeout,
2575 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2576 client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
2578 client->router = NULL;
2579 client->connection = NULL;
2582 /* Frees user_data pointer from socket connection object. This also sends
2583 appropriate notify packets to the network to inform about leaving
2586 void silc_server_free_sock_user_data(SilcServer server,
2587 SilcSocketConnection sock,
2588 const char *signoff_message)
2590 SILC_LOG_DEBUG(("Start"));
2592 switch (sock->type) {
2593 case SILC_SOCKET_TYPE_CLIENT:
2595 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2596 silc_server_free_client_data(server, sock, user_data, TRUE,
2600 case SILC_SOCKET_TYPE_SERVER:
2601 case SILC_SOCKET_TYPE_ROUTER:
2603 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2604 SilcServerEntry backup_router = NULL;
2607 backup_router = silc_server_backup_get(server, user_data->id);
2609 /* If this was our primary router connection then we're lost to
2610 the outside world. */
2611 if (server->router == user_data) {
2612 /* Check whether we have a backup router connection */
2613 if (!backup_router || backup_router == user_data) {
2614 silc_schedule_task_add(server->schedule, 0,
2615 silc_server_connect_to_router,
2618 SILC_TASK_PRI_NORMAL);
2620 server->id_entry->router = NULL;
2621 server->router = NULL;
2622 server->standalone = TRUE;
2623 backup_router = NULL;
2625 SILC_LOG_INFO(("New primary router is backup router %s",
2626 backup_router->server_name));
2627 SILC_LOG_DEBUG(("New primary router is backup router %s",
2628 backup_router->server_name));
2629 server->id_entry->router = backup_router;
2630 server->router = backup_router;
2631 server->router_connect = time(0);
2632 server->backup_primary = TRUE;
2633 if (server->server_type == SILC_BACKUP_ROUTER) {
2634 server->server_type = SILC_ROUTER;
2636 /* We'll need to constantly try to reconnect to the primary
2637 router so that we'll see when it comes back online. */
2638 silc_server_backup_reconnect(server, sock->ip, sock->port,
2639 silc_server_backup_connected,
2643 /* Mark this connection as replaced */
2644 silc_server_backup_replaced_add(server, user_data->id,
2647 } else if (backup_router) {
2648 SILC_LOG_INFO(("Enabling the use of backup router %s",
2649 backup_router->server_name));
2650 SILC_LOG_DEBUG(("Enabling the use of backup router %s",
2651 backup_router->server_name));
2653 /* Mark this connection as replaced */
2654 silc_server_backup_replaced_add(server, user_data->id,
2658 if (!backup_router) {
2659 /* Free all client entries that this server owns as they will
2660 become invalid now as well. */
2662 silc_server_remove_clients_by_server(server, user_data, TRUE);
2663 if (server->server_type == SILC_SERVER)
2664 silc_server_remove_channels_by_server(server, user_data);
2666 /* Update the client entries of this server to the new backup
2667 router. This also removes the clients that *really* was owned
2668 by the primary router and went down with the router. */
2669 silc_server_update_clients_by_server(server, user_data, backup_router,
2671 silc_server_update_servers_by_server(server, user_data, backup_router);
2672 if (server->server_type == SILC_SERVER)
2673 silc_server_update_channels_by_server(server, user_data,
2677 /* Free the server entry */
2678 silc_server_backup_del(server, user_data);
2679 silc_server_backup_replaced_del(server, user_data);
2680 silc_idlist_del_data(user_data);
2681 if (!silc_idlist_del_server(server->local_list, user_data))
2682 silc_idlist_del_server(server->global_list, user_data);
2683 server->stat.my_servers--;
2684 server->stat.servers--;
2685 if (server->server_type == SILC_ROUTER)
2686 server->stat.cell_servers--;
2688 if (backup_router) {
2689 /* Announce all of our stuff that was created about 5 minutes ago.
2690 The backup router knows all the other stuff already. */
2691 if (server->server_type == SILC_ROUTER)
2692 silc_server_announce_servers(server, FALSE, time(0) - 300,
2693 backup_router->connection);
2695 /* Announce our clients and channels to the router */
2696 silc_server_announce_clients(server, time(0) - 300,
2697 backup_router->connection);
2698 silc_server_announce_channels(server, time(0) - 300,
2699 backup_router->connection);
2705 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2707 silc_idlist_del_data(user_data);
2708 silc_free(user_data);
2713 /* If any protocol is active cancel its execution */
2714 if (sock->protocol) {
2715 silc_protocol_cancel(sock->protocol, server->schedule);
2716 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2717 silc_protocol_execute_final(sock->protocol, server->schedule);
2718 sock->protocol = NULL;
2721 sock->user_data = NULL;
2724 /* Removes client from all channels it has joined. This is used when client
2725 connection is disconnected. If the client on a channel is last, the
2726 channel is removed as well. This sends the SIGNOFF notify types. */
2728 void silc_server_remove_from_channels(SilcServer server,
2729 SilcSocketConnection sock,
2730 SilcClientEntry client,
2732 const char *signoff_message,
2735 SilcChannelEntry channel;
2736 SilcChannelClientEntry chl;
2737 SilcHashTableList htl;
2740 SILC_LOG_DEBUG(("Start"));
2742 if (!client || !client->id)
2745 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2749 /* Remove the client from all channels. The client is removed from
2750 the channels' user list. */
2751 silc_hash_table_list(client->channels, &htl);
2752 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2753 channel = chl->channel;
2755 /* Remove channel if this is last client leaving the channel, unless
2756 the channel is permanent. */
2757 if (server->server_type == SILC_ROUTER &&
2758 silc_hash_table_count(channel->user_list) < 2) {
2759 silc_server_channel_delete(server, channel);
2763 silc_hash_table_del(client->channels, channel);
2764 silc_hash_table_del(channel->user_list, chl->client);
2765 channel->user_count--;
2767 /* If there is no global users on the channel anymore mark the channel
2768 as local channel. Do not check if the removed client is local client. */
2769 if (server->server_type != SILC_ROUTER && channel->global_users &&
2770 chl->client->router && !silc_server_channel_has_global(channel))
2771 channel->global_users = FALSE;
2774 server->stat.my_chanclients--;
2776 /* If there is not at least one local user on the channel then we don't
2777 need the channel entry anymore, we can remove it safely, unless the
2778 channel is permanent channel */
2779 if (server->server_type != SILC_ROUTER &&
2780 !silc_server_channel_has_local(channel)) {
2781 /* Notify about leaving client if this channel has global users. */
2782 if (notify && channel->global_users)
2783 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2784 SILC_NOTIFY_TYPE_SIGNOFF,
2785 signoff_message ? 2 : 1,
2786 clidp->data, clidp->len,
2787 signoff_message, signoff_message ?
2788 strlen(signoff_message) : 0);
2790 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2791 silc_server_channel_delete(server, channel);
2795 /* Send notify to channel about client leaving SILC and channel too */
2797 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2798 SILC_NOTIFY_TYPE_SIGNOFF,
2799 signoff_message ? 2 : 1,
2800 clidp->data, clidp->len,
2801 signoff_message, signoff_message ?
2802 strlen(signoff_message) : 0);
2804 /* Re-generate channel key if needed */
2805 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2806 if (!silc_server_create_channel_key(server, channel, 0))
2809 /* Send the channel key to the channel. The key of course is not sent
2810 to the client who was removed from the channel. */
2811 silc_server_send_channel_key(server, client->connection, channel,
2812 server->server_type == SILC_ROUTER ?
2813 FALSE : !server->standalone);
2817 silc_hash_table_list_reset(&htl);
2818 silc_buffer_free(clidp);
2821 /* Removes client from one channel. This is used for example when client
2822 calls LEAVE command to remove itself from the channel. Returns TRUE
2823 if channel still exists and FALSE if the channel is removed when
2824 last client leaves the channel. If `notify' is FALSE notify messages
2827 bool silc_server_remove_from_one_channel(SilcServer server,
2828 SilcSocketConnection sock,
2829 SilcChannelEntry channel,
2830 SilcClientEntry client,
2833 SilcChannelClientEntry chl;
2836 SILC_LOG_DEBUG(("Removing %s from channel %s",
2837 silc_id_render(client->id, SILC_ID_CLIENT),
2838 channel->channel_name));
2840 /* Get the entry to the channel, if this client is not on the channel
2842 if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
2845 /* Remove channel if this is last client leaving the channel, unless
2846 the channel is permanent. */
2847 if (server->server_type == SILC_ROUTER &&
2848 silc_hash_table_count(channel->user_list) < 2) {
2849 silc_server_channel_delete(server, channel);
2853 silc_hash_table_del(client->channels, chl->channel);
2854 silc_hash_table_del(channel->user_list, chl->client);
2855 channel->user_count--;
2857 /* If there is no global users on the channel anymore mark the channel
2858 as local channel. Do not check if the client is local client. */
2859 if (server->server_type != SILC_ROUTER && channel->global_users &&
2860 chl->client->router && !silc_server_channel_has_global(channel))
2861 channel->global_users = FALSE;
2864 server->stat.my_chanclients--;
2866 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2870 /* If there is not at least one local user on the channel then we don't
2871 need the channel entry anymore, we can remove it safely, unless the
2872 channel is permanent channel */
2873 if (server->server_type != SILC_ROUTER &&
2874 !silc_server_channel_has_local(channel)) {
2875 /* Notify about leaving client if this channel has global users. */
2876 if (notify && channel->global_users)
2877 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2878 SILC_NOTIFY_TYPE_LEAVE, 1,
2879 clidp->data, clidp->len);
2881 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2882 silc_server_channel_delete(server, channel);
2883 silc_buffer_free(clidp);
2887 /* Send notify to channel about client leaving the channel */
2889 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2890 SILC_NOTIFY_TYPE_LEAVE, 1,
2891 clidp->data, clidp->len);
2893 silc_buffer_free(clidp);
2897 /* Timeout callback. This is called if connection is idle or for some
2898 other reason is not responding within some period of time. This
2899 disconnects the remote end. */
2901 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2903 SilcServer server = (SilcServer)context;
2904 SilcSocketConnection sock = server->sockets[fd];
2905 SilcProtocolType protocol = 0;
2907 SILC_LOG_DEBUG(("Start"));
2912 SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
2913 sock->hostname, sock->ip));
2915 /* If we have protocol active we must assure that we call the protocol's
2916 final callback so that all the memory is freed. */
2917 if (sock->protocol) {
2918 protocol = sock->protocol->protocol->type;
2919 silc_protocol_cancel(sock->protocol, server->schedule);
2920 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2921 silc_protocol_execute_final(sock->protocol, server->schedule);
2922 sock->protocol = NULL;
2926 if (sock->user_data)
2927 silc_server_free_sock_user_data(server, sock, NULL);
2929 silc_server_disconnect_remote(server, sock,
2931 SILC_PROTOCOL_SERVER_CONNECTION_AUTH ?
2932 SILC_STATUS_ERR_AUTH_FAILED :
2933 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
2934 "Connection timeout");
2937 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2938 function may be used only by router. In real SILC network all channels
2939 are created by routers thus this function is never used by normal
2942 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2943 SilcServerID *router_id,
2949 SilcChannelID *channel_id;
2950 SilcChannelEntry entry;
2954 SILC_LOG_DEBUG(("Creating new channel"));
2957 cipher = SILC_DEFAULT_CIPHER;
2959 hmac = SILC_DEFAULT_HMAC;
2961 /* Allocate cipher */
2962 if (!silc_cipher_alloc(cipher, &key))
2966 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2967 silc_cipher_free(key);
2971 channel_name = strdup(channel_name);
2973 /* Create the channel ID */
2974 if (!silc_id_create_channel_id(server, router_id, server->rng,
2976 silc_free(channel_name);
2977 silc_cipher_free(key);
2978 silc_hmac_free(newhmac);
2982 /* Create the channel */
2983 entry = silc_idlist_add_channel(server->local_list, channel_name,
2984 SILC_CHANNEL_MODE_NONE, channel_id,
2985 NULL, key, newhmac, 0);
2987 silc_free(channel_name);
2988 silc_cipher_free(key);
2989 silc_hmac_free(newhmac);
2990 silc_free(channel_id);
2994 entry->cipher = strdup(cipher);
2995 entry->hmac_name = strdup(hmac);
2997 /* Now create the actual key material */
2998 if (!silc_server_create_channel_key(server, entry,
2999 silc_cipher_get_key_len(key) / 8)) {
3000 silc_idlist_del_channel(server->local_list, entry);
3004 /* Notify other routers about the new channel. We send the packet
3005 to our primary route. */
3006 if (broadcast && server->standalone == FALSE)
3007 silc_server_send_new_channel(server, server->router->connection, TRUE,
3008 channel_name, entry->id,
3009 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3012 server->stat.my_channels++;
3014 if (server->server_type == SILC_ROUTER)
3015 entry->users_resolved = TRUE;
3020 /* Same as above but creates the channel with Channel ID `channel_id. */
3023 silc_server_create_new_channel_with_id(SilcServer server,
3027 SilcChannelID *channel_id,
3030 SilcChannelEntry entry;
3034 SILC_LOG_DEBUG(("Creating new channel"));
3037 cipher = SILC_DEFAULT_CIPHER;
3039 hmac = SILC_DEFAULT_HMAC;
3041 /* Allocate cipher */
3042 if (!silc_cipher_alloc(cipher, &key))
3046 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3047 silc_cipher_free(key);
3051 channel_name = strdup(channel_name);
3053 /* Create the channel */
3054 entry = silc_idlist_add_channel(server->local_list, channel_name,
3055 SILC_CHANNEL_MODE_NONE, channel_id,
3056 NULL, key, newhmac, 0);
3058 silc_cipher_free(key);
3059 silc_hmac_free(newhmac);
3060 silc_free(channel_name);
3064 /* Now create the actual key material */
3065 if (!silc_server_create_channel_key(server, entry,
3066 silc_cipher_get_key_len(key) / 8)) {
3067 silc_idlist_del_channel(server->local_list, entry);
3071 /* Notify other routers about the new channel. We send the packet
3072 to our primary route. */
3073 if (broadcast && server->standalone == FALSE)
3074 silc_server_send_new_channel(server, server->router->connection, TRUE,
3075 channel_name, entry->id,
3076 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3079 server->stat.my_channels++;
3081 if (server->server_type == SILC_ROUTER)
3082 entry->users_resolved = TRUE;
3087 /* Channel's key re-key timeout callback. */
3089 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3091 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3092 SilcServer server = (SilcServer)rekey->context;
3096 if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3099 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3102 /* Generates new channel key. This is used to create the initial channel key
3103 but also to re-generate new key for channel. If `key_len' is provided
3104 it is the bytes of the key length. */
3106 bool silc_server_create_channel_key(SilcServer server,
3107 SilcChannelEntry channel,
3111 unsigned char channel_key[32], hash[32];
3114 SILC_LOG_DEBUG(("Generating channel key"));
3116 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3117 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3121 if (!channel->channel_key)
3122 if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3123 channel->channel_key = NULL;
3129 else if (channel->key_len)
3130 len = channel->key_len / 8;
3132 len = silc_cipher_get_key_len(channel->channel_key) / 8;
3134 /* Create channel key */
3135 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3138 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3140 /* Remove old key if exists */
3142 memset(channel->key, 0, channel->key_len / 8);
3143 silc_free(channel->key);
3147 channel->key_len = len * 8;
3148 channel->key = silc_memdup(channel_key, len);
3149 memset(channel_key, 0, sizeof(channel_key));
3151 /* Generate HMAC key from the channel key data and set it */
3153 silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3154 silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3155 silc_hmac_set_key(channel->hmac, hash,
3156 silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3157 memset(hash, 0, sizeof(hash));
3159 if (server->server_type == SILC_ROUTER) {
3160 if (!channel->rekey)
3161 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3162 channel->rekey->context = (void *)server;
3163 channel->rekey->channel = channel;
3164 channel->rekey->key_len = key_len;
3165 if (channel->rekey->task)
3166 silc_schedule_task_del(server->schedule, channel->rekey->task);
3168 channel->rekey->task =
3169 silc_schedule_task_add(server->schedule, 0,
3170 silc_server_channel_key_rekey,
3171 (void *)channel->rekey,
3172 server->config->channel_rekey_secs, 0,
3174 SILC_TASK_PRI_NORMAL);
3180 /* Saves the channel key found in the encoded `key_payload' buffer. This
3181 function is used when we receive Channel Key Payload and also when we're
3182 processing JOIN command reply. Returns entry to the channel. */
3184 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3185 SilcBuffer key_payload,
3186 SilcChannelEntry channel)
3188 SilcChannelKeyPayload payload = NULL;
3189 SilcChannelID *id = NULL;
3190 unsigned char *tmp, hash[32];
3194 SILC_LOG_DEBUG(("Start"));
3196 /* Decode channel key payload */
3197 payload = silc_channel_key_payload_parse(key_payload->data,
3200 SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3205 /* Get the channel entry */
3208 /* Get channel ID */
3209 tmp = silc_channel_key_get_id(payload, &tmp_len);
3210 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3216 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3218 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3220 SILC_LOG_ERROR(("Received key for non-existent channel %s",
3221 silc_id_render(id, SILC_ID_CHANNEL)));
3227 tmp = silc_channel_key_get_key(payload, &tmp_len);
3233 cipher = silc_channel_key_get_cipher(payload, NULL);
3239 /* Remove old key if exists */
3241 memset(channel->key, 0, channel->key_len / 8);
3242 silc_free(channel->key);
3243 silc_cipher_free(channel->channel_key);
3246 /* Create new cipher */
3247 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3248 channel->channel_key = NULL;
3253 if (channel->cipher)
3254 silc_free(channel->cipher);
3255 channel->cipher = strdup(cipher);
3258 channel->key_len = tmp_len * 8;
3259 channel->key = silc_memdup(tmp, tmp_len);
3260 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3262 /* Generate HMAC key from the channel key data and set it */
3264 silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3265 silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3266 silc_hmac_set_key(channel->hmac, hash,
3267 silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3269 memset(hash, 0, sizeof(hash));
3270 memset(tmp, 0, tmp_len);
3272 if (server->server_type == SILC_ROUTER) {
3273 if (!channel->rekey)
3274 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3275 channel->rekey->context = (void *)server;
3276 channel->rekey->channel = channel;
3277 if (channel->rekey->task)
3278 silc_schedule_task_del(server->schedule, channel->rekey->task);
3280 channel->rekey->task =
3281 silc_schedule_task_add(server->schedule, 0,
3282 silc_server_channel_key_rekey,
3283 (void *)channel->rekey,
3284 server->config->channel_rekey_secs, 0,
3286 SILC_TASK_PRI_NORMAL);
3292 silc_channel_key_payload_free(payload);
3297 /* Heartbeat callback. This function is set as argument for the
3298 silc_socket_set_heartbeat function. The library will call this function
3299 at the set time interval. */
3301 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3304 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
3306 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname, sock->ip));
3308 /* Send the heartbeat */
3309 silc_server_send_heartbeat(hb->server, sock);
3312 /* Returns assembled of all servers in the given ID list. The packet's
3313 form is dictated by the New ID payload. */
3315 static void silc_server_announce_get_servers(SilcServer server,
3316 SilcServerEntry remote,
3318 SilcBuffer *servers,
3319 unsigned long creation_time)
3321 SilcIDCacheList list;
3322 SilcIDCacheEntry id_cache;
3323 SilcServerEntry entry;
3326 /* Go through all clients in the list */
3327 if (silc_idcache_get_all(id_list->servers, &list)) {
3328 if (silc_idcache_list_first(list, &id_cache)) {
3330 entry = (SilcServerEntry)id_cache->context;
3332 /* Do not announce the one we've sending our announcements and
3333 do not announce ourself. Also check the creation time if it's
3335 if ((entry == remote) || (entry == server->id_entry) ||
3336 (creation_time && entry->data.created < creation_time)) {
3337 if (!silc_idcache_list_next(list, &id_cache))
3342 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3344 *servers = silc_buffer_realloc(*servers,
3346 (*servers)->truelen + idp->len :
3348 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3349 silc_buffer_put(*servers, idp->data, idp->len);
3350 silc_buffer_pull(*servers, idp->len);
3351 silc_buffer_free(idp);
3353 if (!silc_idcache_list_next(list, &id_cache))
3358 silc_idcache_list_free(list);
3363 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
3369 p = silc_notify_payload_encode(notify, argc, ap);
3375 /* This function is used by router to announce existing servers to our
3376 primary router when we've connected to it. If `creation_time' is non-zero
3377 then only the servers that has been created after the `creation_time'
3378 will be announced. */
3380 void silc_server_announce_servers(SilcServer server, bool global,
3381 unsigned long creation_time,
3382 SilcSocketConnection remote)
3384 SilcBuffer servers = NULL;
3386 SILC_LOG_DEBUG(("Announcing servers"));
3388 /* Get servers in local list */
3389 silc_server_announce_get_servers(server, remote->user_data,
3390 server->local_list, &servers,
3394 /* Get servers in global list */
3395 silc_server_announce_get_servers(server, remote->user_data,
3396 server->global_list, &servers,
3400 silc_buffer_push(servers, servers->data - servers->head);
3401 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3403 /* Send the packet */
3404 silc_server_packet_send(server, remote,
3405 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3406 servers->data, servers->len, TRUE);
3408 silc_buffer_free(servers);
3412 /* Returns assembled packet of all clients in the given ID list. The
3413 packet's form is dictated by the New ID Payload. */
3415 static void silc_server_announce_get_clients(SilcServer server,
3417 SilcBuffer *clients,
3419 unsigned long creation_time)
3421 SilcIDCacheList list;
3422 SilcIDCacheEntry id_cache;
3423 SilcClientEntry client;
3426 unsigned char mode[4];
3428 /* Go through all clients in the list */
3429 if (silc_idcache_get_all(id_list->clients, &list)) {
3430 if (silc_idcache_list_first(list, &id_cache)) {
3432 client = (SilcClientEntry)id_cache->context;
3434 if (creation_time && client->data.created < creation_time) {
3435 if (!silc_idcache_list_next(list, &id_cache))
3440 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3442 *clients = silc_buffer_realloc(*clients,
3444 (*clients)->truelen + idp->len :
3446 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3447 silc_buffer_put(*clients, idp->data, idp->len);
3448 silc_buffer_pull(*clients, idp->len);
3450 SILC_PUT32_MSB(client->mode, mode);
3451 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
3452 2, idp->data, idp->len,
3454 *umodes = silc_buffer_realloc(*umodes,
3456 (*umodes)->truelen + tmp->len :
3458 silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
3459 silc_buffer_put(*umodes, tmp->data, tmp->len);
3460 silc_buffer_pull(*umodes, tmp->len);
3461 silc_buffer_free(tmp);
3463 silc_buffer_free(idp);
3465 if (!silc_idcache_list_next(list, &id_cache))
3470 silc_idcache_list_free(list);
3474 /* This function is used to announce our existing clients to our router
3475 when we've connected to it. If `creation_time' is non-zero then only
3476 the clients that has been created after the `creation_time' will be
3479 void silc_server_announce_clients(SilcServer server,
3480 unsigned long creation_time,
3481 SilcSocketConnection remote)
3483 SilcBuffer clients = NULL;
3484 SilcBuffer umodes = NULL;
3486 SILC_LOG_DEBUG(("Announcing clients"));
3488 /* Get clients in local list */
3489 silc_server_announce_get_clients(server, server->local_list,
3490 &clients, &umodes, creation_time);
3492 /* As router we announce our global list as well */
3493 if (server->server_type == SILC_ROUTER)
3494 silc_server_announce_get_clients(server, server->global_list,
3495 &clients, &umodes, creation_time);
3498 silc_buffer_push(clients, clients->data - clients->head);
3499 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3501 /* Send the packet */
3502 silc_server_packet_send(server, remote,
3503 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3504 clients->data, clients->len, TRUE);
3506 silc_buffer_free(clients);
3510 silc_buffer_push(umodes, umodes->data - umodes->head);
3511 SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
3513 /* Send the packet */
3514 silc_server_packet_send(server, remote,
3515 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3516 umodes->data, umodes->len, TRUE);
3518 silc_buffer_free(umodes);
3522 /* Returns channel's topic for announcing it */
3524 void silc_server_announce_get_channel_topic(SilcServer server,
3525 SilcChannelEntry channel,
3530 if (channel->topic) {
3531 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3532 *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
3533 chidp->data, chidp->len,
3535 strlen(channel->topic));
3536 silc_buffer_free(chidp);
3540 /* Returns assembled packets for channel users of the `channel'. */
3542 void silc_server_announce_get_channel_users(SilcServer server,
3543 SilcChannelEntry channel,
3544 SilcBuffer *channel_users,
3545 SilcBuffer *channel_users_modes)
3547 SilcChannelClientEntry chl;
3548 SilcHashTableList htl;
3549 SilcBuffer chidp, clidp;
3552 unsigned char mode[4], *fkey = NULL;
3553 SilcUInt32 fkey_len = 0;
3555 SILC_LOG_DEBUG(("Start"));
3557 /* Now find all users on the channel */
3558 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3559 silc_hash_table_list(channel->user_list, &htl);
3560 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3561 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3564 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
3565 clidp->data, clidp->len,
3566 chidp->data, chidp->len);
3569 silc_buffer_realloc(*channel_users,
3571 (*channel_users)->truelen + len : len));
3572 silc_buffer_pull_tail(*channel_users,
3573 ((*channel_users)->end -
3574 (*channel_users)->data));
3576 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3577 silc_buffer_pull(*channel_users, len);
3578 silc_buffer_free(tmp);
3580 /* CUMODE notify for mode change on the channel */
3581 SILC_PUT32_MSB(chl->mode, mode);
3582 if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && channel->founder_key)
3583 fkey = silc_pkcs_public_key_encode(channel->founder_key, &fkey_len);
3584 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
3585 4, clidp->data, clidp->len,
3587 clidp->data, clidp->len,
3590 *channel_users_modes =
3591 silc_buffer_realloc(*channel_users_modes,
3592 (*channel_users_modes ?
3593 (*channel_users_modes)->truelen + len : len));
3594 silc_buffer_pull_tail(*channel_users_modes,
3595 ((*channel_users_modes)->end -
3596 (*channel_users_modes)->data));
3598 silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
3599 silc_buffer_pull(*channel_users_modes, len);
3600 silc_buffer_free(tmp);
3602 silc_buffer_free(clidp);
3604 silc_hash_table_list_reset(&htl);
3605 silc_buffer_free(chidp);
3608 /* Returns assembled packets for all channels and users on those channels
3609 from the given ID List. The packets are in the form dictated by the
3610 New Channel and New Channel User payloads. */
3612 void silc_server_announce_get_channels(SilcServer server,
3614 SilcBuffer *channels,
3615 SilcBuffer *channel_users,
3616 SilcBuffer **channel_users_modes,
3617 SilcUInt32 *channel_users_modes_c,
3618 SilcBuffer **channel_topics,
3619 SilcChannelID ***channel_ids,
3620 unsigned long creation_time)
3622 SilcIDCacheList list;
3623 SilcIDCacheEntry id_cache;
3624 SilcChannelEntry channel;
3627 SilcUInt16 name_len;
3629 int i = *channel_users_modes_c;
3632 SILC_LOG_DEBUG(("Start"));
3634 /* Go through all channels in the list */
3635 if (silc_idcache_get_all(id_list->channels, &list)) {
3636 if (silc_idcache_list_first(list, &id_cache)) {
3638 channel = (SilcChannelEntry)id_cache->context;
3640 if (creation_time && channel->created < creation_time)
3645 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3646 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3647 name_len = strlen(channel->channel_name);
3650 len = 4 + name_len + id_len + 4;
3652 silc_buffer_realloc(*channels,
3653 (*channels ? (*channels)->truelen +
3655 silc_buffer_pull_tail(*channels,
3656 ((*channels)->end - (*channels)->data));
3657 silc_buffer_format(*channels,
3658 SILC_STR_UI_SHORT(name_len),
3659 SILC_STR_UI_XNSTRING(channel->channel_name,
3661 SILC_STR_UI_SHORT(id_len),
3662 SILC_STR_UI_XNSTRING(cid, id_len),
3663 SILC_STR_UI_INT(channel->mode),
3665 silc_buffer_pull(*channels, len);
3668 /* Channel user modes */
3669 *channel_users_modes = silc_realloc(*channel_users_modes,
3670 sizeof(**channel_users_modes) *
3672 (*channel_users_modes)[i] = NULL;
3673 *channel_ids = silc_realloc(*channel_ids,
3674 sizeof(**channel_ids) * (i + 1));
3675 (*channel_ids)[i] = NULL;
3676 silc_server_announce_get_channel_users(server, channel,
3678 &(*channel_users_modes)[i]);
3679 (*channel_ids)[i] = channel->id;
3681 /* Channel's topic */
3682 *channel_topics = silc_realloc(*channel_topics,
3683 sizeof(**channel_topics) * (i + 1));
3684 (*channel_topics)[i] = NULL;
3685 silc_server_announce_get_channel_topic(server, channel,
3686 &(*channel_topics)[i]);
3689 if (!silc_idcache_list_next(list, &id_cache))
3693 *channel_users_modes_c += i;
3696 silc_idcache_list_free(list);
3700 /* This function is used to announce our existing channels to our router
3701 when we've connected to it. This also announces the users on the
3702 channels to the router. If the `creation_time' is non-zero only the
3703 channels that was created after the `creation_time' are announced.
3704 Note that the channel users are still announced even if the `creation_time'
3707 void silc_server_announce_channels(SilcServer server,
3708 unsigned long creation_time,
3709 SilcSocketConnection remote)
3711 SilcBuffer channels = NULL, channel_users = NULL;
3712 SilcBuffer *channel_users_modes = NULL;
3713 SilcBuffer *channel_topics = NULL;
3714 SilcUInt32 channel_users_modes_c = 0;
3715 SilcChannelID **channel_ids = NULL;
3717 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3719 /* Get channels and channel users in local list */
3720 silc_server_announce_get_channels(server, server->local_list,
3721 &channels, &channel_users,
3722 &channel_users_modes,
3723 &channel_users_modes_c,
3725 &channel_ids, creation_time);
3727 /* Get channels and channel users in global list */
3728 if (server->server_type != SILC_SERVER)
3729 silc_server_announce_get_channels(server, server->global_list,
3730 &channels, &channel_users,
3731 &channel_users_modes,
3732 &channel_users_modes_c,
3734 &channel_ids, creation_time);
3737 silc_buffer_push(channels, channels->data - channels->head);
3738 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3740 /* Send the packet */
3741 silc_server_packet_send(server, remote,
3742 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3743 channels->data, channels->len,
3746 silc_buffer_free(channels);
3749 if (channel_users) {
3750 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3751 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3752 channel_users->len);
3754 /* Send the packet */
3755 silc_server_packet_send(server, remote,
3756 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3757 channel_users->data, channel_users->len,
3760 silc_buffer_free(channel_users);
3763 if (channel_users_modes) {
3766 for (i = 0; i < channel_users_modes_c; i++) {
3767 if (!channel_users_modes[i])
3769 silc_buffer_push(channel_users_modes[i],
3770 channel_users_modes[i]->data -
3771 channel_users_modes[i]->head);
3772 SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
3773 channel_users_modes[i]->len);
3774 silc_server_packet_send_dest(server, remote,
3775 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3776 channel_ids[i], SILC_ID_CHANNEL,
3777 channel_users_modes[i]->data,
3778 channel_users_modes[i]->len,
3780 silc_buffer_free(channel_users_modes[i]);
3782 silc_free(channel_users_modes);
3785 if (channel_topics) {
3788 for (i = 0; i < channel_users_modes_c; i++) {
3789 if (!channel_topics[i])
3792 silc_buffer_push(channel_topics[i],
3793 channel_topics[i]->data -
3794 channel_topics[i]->head);
3795 SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
3796 channel_topics[i]->len);
3797 silc_server_packet_send_dest(server, remote,
3798 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3799 channel_ids[i], SILC_ID_CHANNEL,
3800 channel_topics[i]->data,
3801 channel_topics[i]->len,
3803 silc_buffer_free(channel_topics[i]);
3805 silc_free(channel_topics);
3808 silc_free(channel_ids);
3811 /* Failure timeout callback. If this is called then we will immediately
3812 process the received failure. We always process the failure with timeout
3813 since we do not want to blindly trust to received failure packets.
3814 This won't be called (the timeout is cancelled) if the failure was
3815 bogus (it is bogus if remote does not close the connection after sending
3818 SILC_TASK_CALLBACK(silc_server_failure_callback)
3820 SilcServerFailureContext f = (SilcServerFailureContext)context;
3822 if (f->sock->protocol) {
3823 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3824 silc_protocol_execute(f->sock->protocol, f->server->schedule, 0, 0);
3830 /* Assembles user list and users mode list from the `channel'. */
3832 void silc_server_get_users_on_channel(SilcServer server,
3833 SilcChannelEntry channel,
3834 SilcBuffer *user_list,
3835 SilcBuffer *mode_list,
3836 SilcUInt32 *user_count)
3838 SilcChannelClientEntry chl;
3839 SilcHashTableList htl;
3840 SilcBuffer client_id_list;
3841 SilcBuffer client_mode_list;
3843 SilcUInt32 list_count = 0, len = 0;
3845 silc_hash_table_list(channel->user_list, &htl);
3846 while (silc_hash_table_get(&htl, NULL, (void *)&chl))
3847 len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
3848 silc_hash_table_list_reset(&htl);
3850 client_id_list = silc_buffer_alloc(len);
3852 silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
3853 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3854 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3856 silc_hash_table_list(channel->user_list, &htl);
3857 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3859 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3860 silc_buffer_put(client_id_list, idp->data, idp->len);
3861 silc_buffer_pull(client_id_list, idp->len);
3862 silc_buffer_free(idp);
3864 /* Client's mode on channel */
3865 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3866 silc_buffer_pull(client_mode_list, 4);
3870 silc_hash_table_list_reset(&htl);
3871 silc_buffer_push(client_id_list,
3872 client_id_list->data - client_id_list->head);
3873 silc_buffer_push(client_mode_list,
3874 client_mode_list->data - client_mode_list->head);
3876 *user_list = client_id_list;
3877 *mode_list = client_mode_list;
3878 *user_count = list_count;
3881 /* Saves users and their modes to the `channel'. */
3883 void silc_server_save_users_on_channel(SilcServer server,
3884 SilcSocketConnection sock,
3885 SilcChannelEntry channel,
3886 SilcClientID *noadd,
3887 SilcBuffer user_list,
3888 SilcBuffer mode_list,
3889 SilcUInt32 user_count)
3894 SilcClientID *client_id;
3895 SilcClientEntry client;
3896 SilcIDCacheEntry cache;
3897 SilcChannelClientEntry chl;
3900 SILC_LOG_DEBUG(("Start"));
3902 for (i = 0; i < user_count; i++) {
3904 SILC_GET16_MSB(idp_len, user_list->data + 2);
3906 client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
3907 silc_buffer_pull(user_list, idp_len);
3912 SILC_GET32_MSB(mode, mode_list->data);
3913 silc_buffer_pull(mode_list, 4);
3915 if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3916 silc_free(client_id);
3922 /* Check if we have this client cached already. */
3923 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3924 server->server_type, &cache);
3926 client = silc_idlist_find_client_by_id(server->global_list,
3927 client_id, server->server_type,
3932 /* If router did not find such Client ID in its lists then this must
3933 be bogus client or some router in the net is buggy. */
3934 if (server->server_type == SILC_ROUTER) {
3935 silc_free(client_id);
3939 /* We don't have that client anywhere, add it. The client is added
3940 to global list since server didn't have it in the lists so it must be
3942 client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
3943 silc_id_dup(client_id, SILC_ID_CLIENT),
3944 sock->user_data, NULL, 0);
3946 SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
3947 silc_free(client_id);
3951 client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
3953 /* Found, if it is from global list we'll assure that we won't
3954 expire it now that the entry is on channel. */
3959 silc_free(client_id);
3961 if (!silc_server_client_on_channel(client, channel, &chl)) {
3962 /* Client was not on the channel, add it. */
3963 chl = silc_calloc(1, sizeof(*chl));
3964 chl->client = client;
3966 chl->channel = channel;
3967 silc_hash_table_add(channel->user_list, chl->client, chl);
3968 silc_hash_table_add(client->channels, chl->channel, chl);
3969 channel->user_count++;
3977 /* Saves channels and channels user modes to the `client'. Removes
3978 the client from those channels that are not sent in the list but
3981 void silc_server_save_user_channels(SilcServer server,
3982 SilcSocketConnection sock,
3983 SilcClientEntry client,
3984 SilcBuffer channels,
3985 SilcBuffer channels_user_modes)
3988 SilcUInt32 *chumodes;
3989 SilcChannelPayload entry;
3990 SilcChannelEntry channel;
3991 SilcChannelID *channel_id;
3992 SilcChannelClientEntry chl;
3993 SilcHashTable ht = NULL;
3994 SilcHashTableList htl;
3998 if (!channels ||!channels_user_modes)
4001 ch = silc_channel_payload_parse_list(channels->data, channels->len);
4002 if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4004 ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4005 NULL, NULL, NULL, TRUE);
4006 silc_dlist_start(ch);
4007 while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4008 /* Check if we have this channel, and add it if we don't have it.
4009 Also add the client on the channel unless it is there already. */
4010 channel_id = silc_channel_get_id_parse(entry);
4011 channel = silc_idlist_find_channel_by_id(server->local_list,
4014 channel = silc_idlist_find_channel_by_id(server->global_list,
4017 if (server->server_type != SILC_SERVER) {
4018 silc_free(channel_id);
4023 /* We don't have that channel anywhere, add it. */
4024 name = silc_channel_get_name(entry, NULL);
4025 channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4026 channel_id, server->router,
4029 silc_free(channel_id);
4036 channel->mode = silc_channel_get_mode(entry);
4038 /* Add the client on the channel */
4039 if (!silc_server_client_on_channel(client, channel, &chl)) {
4040 chl = silc_calloc(1, sizeof(*chl));
4041 chl->client = client;
4042 chl->mode = chumodes[i++];
4043 chl->channel = channel;
4044 silc_hash_table_add(channel->user_list, chl->client, chl);
4045 silc_hash_table_add(client->channels, chl->channel, chl);
4046 channel->user_count++;
4049 chl->mode = chumodes[i++];
4052 silc_hash_table_add(ht, channel, channel);
4053 silc_free(channel_id);
4055 silc_channel_payload_list_free(ch);
4056 silc_free(chumodes);
4060 /* Go through the list again and remove client from channels that
4061 are no part of the list. */
4063 silc_hash_table_list(client->channels, &htl);
4064 while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4065 if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4066 silc_hash_table_del(chl->channel->user_list, chl->client);
4067 silc_hash_table_del(chl->client->channels, chl->channel);
4071 silc_hash_table_list_reset(&htl);
4072 silc_hash_table_free(ht);
4074 silc_hash_table_list(client->channels, &htl);
4075 while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4076 silc_hash_table_del(chl->channel->user_list, chl->client);
4077 silc_hash_table_del(chl->client->channels, chl->channel);
4080 silc_hash_table_list_reset(&htl);
4084 /* Lookups route to the client indicated by the `id_data'. The connection
4085 object and internal data object is returned. Returns NULL if route
4086 could not be found to the client. If the `client_id' is specified then
4087 it is used and the `id_data' is ignored. */
4089 SilcSocketConnection
4090 silc_server_get_client_route(SilcServer server,
4091 unsigned char *id_data,
4093 SilcClientID *client_id,
4094 SilcIDListData *idata,
4095 SilcClientEntry *client_entry)
4098 SilcClientEntry client;
4100 SILC_LOG_DEBUG(("Start"));
4103 *client_entry = NULL;
4105 /* Decode destination Client ID */
4107 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4109 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4113 id = silc_id_dup(client_id, SILC_ID_CLIENT);
4116 /* If the destination belongs to our server we don't have to route
4117 the packet anywhere but to send it to the local destination. */
4118 client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4122 /* If we are router and the client has router then the client is in
4123 our cell but not directly connected to us. */
4124 if (server->server_type == SILC_ROUTER && client->router) {
4125 /* We are of course in this case the client's router thus the route
4126 to the client is the server who owns the client. So, we will send
4127 the packet to that server. */
4129 *idata = (SilcIDListData)client->router;
4130 return client->router->connection;
4133 /* Seems that client really is directly connected to us */
4135 *idata = (SilcIDListData)client;
4137 *client_entry = client;
4138 return client->connection;
4141 /* Destination belongs to someone not in this server. If we are normal
4142 server our action is to send the packet to our router. */
4143 if (server->server_type != SILC_ROUTER && !server->standalone) {
4146 *idata = (SilcIDListData)server->router;
4147 return server->router->connection;
4150 /* We are router and we will perform route lookup for the destination
4151 and send the packet to fastest route. */
4152 if (server->server_type == SILC_ROUTER && !server->standalone) {
4153 /* Check first that the ID is valid */
4154 client = silc_idlist_find_client_by_id(server->global_list, id,
4157 SilcSocketConnection dst_sock;
4159 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4163 *idata = (SilcIDListData)dst_sock->user_data;
4172 /* Encodes and returns channel list of channels the `client' has joined.
4173 Secret channels are not put to the list. */
4175 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4176 SilcClientEntry client,
4179 SilcBuffer *user_mode_list)
4181 SilcBuffer buffer = NULL;
4182 SilcChannelEntry channel;
4183 SilcChannelClientEntry chl;
4184 SilcHashTableList htl;
4187 SilcUInt16 name_len;
4191 *user_mode_list = NULL;
4193 silc_hash_table_list(client->channels, &htl);
4194 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4195 channel = chl->channel;
4197 if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4199 if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4202 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4203 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4204 name_len = strlen(channel->channel_name);
4206 len = 4 + name_len + id_len + 4;
4207 buffer = silc_buffer_realloc(buffer,
4208 (buffer ? buffer->truelen + len : len));
4209 silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4210 silc_buffer_format(buffer,
4211 SILC_STR_UI_SHORT(name_len),
4212 SILC_STR_UI_XNSTRING(channel->channel_name,
4214 SILC_STR_UI_SHORT(id_len),
4215 SILC_STR_UI_XNSTRING(cid, id_len),
4216 SILC_STR_UI_INT(chl->channel->mode),
4218 silc_buffer_pull(buffer, len);
4221 if (user_mode_list) {
4222 *user_mode_list = silc_buffer_realloc(*user_mode_list,
4224 (*user_mode_list)->truelen + 4 :
4226 silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
4227 (*user_mode_list)->data));
4228 SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
4229 silc_buffer_pull(*user_mode_list, 4);
4232 silc_hash_table_list_reset(&htl);
4235 silc_buffer_push(buffer, buffer->data - buffer->head);
4236 if (user_mode_list && *user_mode_list)
4237 silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
4238 (*user_mode_list)->head));
4243 /* Finds client entry by Client ID and if it is not found then resolves
4244 it using WHOIS command. */
4246 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
4247 SilcClientID *client_id,
4248 bool always_resolve,
4251 SilcClientEntry client;
4256 client = silc_idlist_find_client_by_id(server->local_list, client_id,
4259 client = silc_idlist_find_client_by_id(server->global_list,
4260 client_id, TRUE, NULL);
4261 if (!client && server->server_type == SILC_ROUTER)
4265 if (!client && server->standalone)
4268 if (!client || !client->nickname || !client->username ||
4270 SilcBuffer buffer, idp;
4273 client->data.status |= SILC_IDLIST_STATUS_RESOLVING;
4274 client->data.status &= ~SILC_IDLIST_STATUS_RESOLVED;
4275 client->resolve_cmd_ident = ++server->cmd_ident;
4278 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
4279 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
4280 server->cmd_ident, 1,
4281 4, idp->data, idp->len);
4282 silc_server_packet_send(server, client ? client->router->connection :
4283 server->router->connection,
4284 SILC_PACKET_COMMAND, 0,
4285 buffer->data, buffer->len, FALSE);
4286 silc_buffer_free(idp);
4287 silc_buffer_free(buffer);
4298 /* A timeout callback for the re-key. We will be the initiator of the
4301 SILC_TASK_CALLBACK(silc_server_rekey_callback)
4303 SilcSocketConnection sock = (SilcSocketConnection)context;
4304 SilcIDListData idata = (SilcIDListData)sock->user_data;
4305 SilcServer server = (SilcServer)idata->rekey->context;
4306 SilcProtocol protocol;
4307 SilcServerRekeyInternalContext *proto_ctx;
4309 SILC_LOG_DEBUG(("Start"));
4311 /* Allocate internal protocol context. This is sent as context
4313 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
4314 proto_ctx->server = (void *)server;
4315 proto_ctx->sock = sock;
4316 proto_ctx->responder = FALSE;
4317 proto_ctx->pfs = idata->rekey->pfs;
4319 /* Perform rekey protocol. Will call the final callback after the
4320 protocol is over. */
4321 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
4322 &protocol, proto_ctx, silc_server_rekey_final);
4323 sock->protocol = protocol;
4325 /* Run the protocol */
4326 silc_protocol_execute(protocol, server->schedule, 0, 0);
4328 /* Re-register re-key timeout */
4329 silc_schedule_task_add(server->schedule, sock->sock,
4330 silc_server_rekey_callback,
4331 context, idata->rekey->timeout, 0,
4332 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
4335 /* The final callback for the REKEY protocol. This will actually take the
4336 new key material into use. */
4338 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
4340 SilcProtocol protocol = (SilcProtocol)context;
4341 SilcServerRekeyInternalContext *ctx =
4342 (SilcServerRekeyInternalContext *)protocol->context;
4343 SilcServer server = (SilcServer)ctx->server;
4344 SilcSocketConnection sock = ctx->sock;
4346 SILC_LOG_DEBUG(("Start"));
4348 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
4349 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
4350 /* Error occured during protocol */
4351 SILC_LOG_ERROR(("Error occurred during rekey protocol"));
4352 silc_protocol_cancel(protocol, server->schedule);
4353 silc_protocol_free(protocol);
4354 sock->protocol = NULL;
4356 silc_packet_context_free(ctx->packet);
4358 silc_ske_free(ctx->ske);
4363 /* Purge the outgoing data queue to assure that all rekey packets really
4364 go to the network before we quit the protocol. */
4365 silc_server_packet_queue_purge(server, sock);
4368 silc_protocol_free(protocol);
4369 sock->protocol = NULL;
4371 silc_packet_context_free(ctx->packet);
4373 silc_ske_free(ctx->ske);
4377 /* Task callback used to retrieve network statistical information from
4378 router server once in a while. */
4380 SILC_TASK_CALLBACK(silc_server_get_stats)
4382 SilcServer server = (SilcServer)context;
4383 SilcBuffer idp, packet;
4385 SILC_LOG_DEBUG(("Retrieving stats from router"));
4387 if (!server->standalone) {
4388 idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
4389 packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
4390 ++server->cmd_ident, 1,
4391 1, idp->data, idp->len);
4392 silc_server_packet_send(server, server->router->connection,
4393 SILC_PACKET_COMMAND, 0, packet->data,
4394 packet->len, FALSE);
4395 silc_buffer_free(packet);
4396 silc_buffer_free(idp);
4399 silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
4400 server, 120, 0, SILC_TASK_TIMEOUT,