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);
2538 /* Send SIGNOFF notify to routers. */
2539 if (notify && !server->standalone && server->router)
2540 silc_server_send_notify_signoff(server, server->router->connection,
2541 server->server_type == SILC_SERVER ?
2542 FALSE : TRUE, client->id, signoff);
2544 /* Remove client from all channels */
2546 silc_server_remove_from_channels(server, NULL, client,
2547 TRUE, (char *)signoff, TRUE);
2549 silc_server_remove_from_channels(server, NULL, client,
2550 FALSE, NULL, FALSE);
2552 /* Check if anyone is watching this nickname */
2553 if (server->server_type == SILC_ROUTER)
2554 silc_server_check_watcher_list(server, client, NULL,
2555 SILC_NOTIFY_TYPE_SIGNOFF);
2557 /* Remove this client from watcher list if it is */
2558 silc_server_del_from_watcher_list(server, client);
2560 /* Update statistics */
2561 server->stat.my_clients--;
2562 server->stat.clients--;
2563 if (server->stat.cell_clients)
2564 server->stat.cell_clients--;
2565 SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
2566 SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
2567 silc_schedule_task_del_by_context(server->schedule, client);
2569 /* We will not delete the client entry right away. We will take it
2570 into history (for WHOWAS command) for 5 minutes */
2573 silc_schedule_task_add(server->schedule, 0,
2574 silc_server_free_client_data_timeout,
2576 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2577 client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
2579 client->router = NULL;
2580 client->connection = NULL;
2583 /* Frees user_data pointer from socket connection object. This also sends
2584 appropriate notify packets to the network to inform about leaving
2587 void silc_server_free_sock_user_data(SilcServer server,
2588 SilcSocketConnection sock,
2589 const char *signoff_message)
2591 SILC_LOG_DEBUG(("Start"));
2593 switch (sock->type) {
2594 case SILC_SOCKET_TYPE_CLIENT:
2596 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2597 silc_server_free_client_data(server, sock, user_data, TRUE,
2601 case SILC_SOCKET_TYPE_SERVER:
2602 case SILC_SOCKET_TYPE_ROUTER:
2604 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2605 SilcServerEntry backup_router = NULL;
2608 backup_router = silc_server_backup_get(server, user_data->id);
2610 /* If this was our primary router connection then we're lost to
2611 the outside world. */
2612 if (server->router == user_data) {
2613 /* Check whether we have a backup router connection */
2614 if (!backup_router || backup_router == user_data) {
2615 silc_schedule_task_add(server->schedule, 0,
2616 silc_server_connect_to_router,
2619 SILC_TASK_PRI_NORMAL);
2621 server->id_entry->router = NULL;
2622 server->router = NULL;
2623 server->standalone = TRUE;
2624 backup_router = NULL;
2626 SILC_LOG_INFO(("New primary router is backup router %s",
2627 backup_router->server_name));
2628 SILC_LOG_DEBUG(("New primary router is backup router %s",
2629 backup_router->server_name));
2630 server->id_entry->router = backup_router;
2631 server->router = backup_router;
2632 server->router_connect = time(0);
2633 server->backup_primary = TRUE;
2634 if (server->server_type == SILC_BACKUP_ROUTER) {
2635 server->server_type = SILC_ROUTER;
2637 /* We'll need to constantly try to reconnect to the primary
2638 router so that we'll see when it comes back online. */
2639 silc_server_backup_reconnect(server, sock->ip, sock->port,
2640 silc_server_backup_connected,
2644 /* Mark this connection as replaced */
2645 silc_server_backup_replaced_add(server, user_data->id,
2648 } else if (backup_router) {
2649 SILC_LOG_INFO(("Enabling the use of backup router %s",
2650 backup_router->server_name));
2651 SILC_LOG_DEBUG(("Enabling the use of backup router %s",
2652 backup_router->server_name));
2654 /* Mark this connection as replaced */
2655 silc_server_backup_replaced_add(server, user_data->id,
2659 if (!backup_router) {
2660 /* Free all client entries that this server owns as they will
2661 become invalid now as well. */
2663 silc_server_remove_clients_by_server(server, user_data, TRUE);
2664 if (server->server_type == SILC_SERVER)
2665 silc_server_remove_channels_by_server(server, user_data);
2667 /* Update the client entries of this server to the new backup
2668 router. This also removes the clients that *really* was owned
2669 by the primary router and went down with the router. */
2670 silc_server_update_clients_by_server(server, user_data, backup_router,
2672 silc_server_update_servers_by_server(server, user_data, backup_router);
2673 if (server->server_type == SILC_SERVER)
2674 silc_server_update_channels_by_server(server, user_data,
2678 /* Free the server entry */
2679 silc_server_backup_del(server, user_data);
2680 silc_server_backup_replaced_del(server, user_data);
2681 silc_idlist_del_data(user_data);
2682 if (!silc_idlist_del_server(server->local_list, user_data))
2683 silc_idlist_del_server(server->global_list, user_data);
2684 server->stat.my_servers--;
2685 server->stat.servers--;
2686 if (server->server_type == SILC_ROUTER)
2687 server->stat.cell_servers--;
2689 if (backup_router) {
2690 /* Announce all of our stuff that was created about 5 minutes ago.
2691 The backup router knows all the other stuff already. */
2692 if (server->server_type == SILC_ROUTER)
2693 silc_server_announce_servers(server, FALSE, time(0) - 300,
2694 backup_router->connection);
2696 /* Announce our clients and channels to the router */
2697 silc_server_announce_clients(server, time(0) - 300,
2698 backup_router->connection);
2699 silc_server_announce_channels(server, time(0) - 300,
2700 backup_router->connection);
2706 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2708 silc_idlist_del_data(user_data);
2709 silc_free(user_data);
2714 /* If any protocol is active cancel its execution */
2715 if (sock->protocol) {
2716 silc_protocol_cancel(sock->protocol, server->schedule);
2717 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2718 silc_protocol_execute_final(sock->protocol, server->schedule);
2719 sock->protocol = NULL;
2722 sock->user_data = NULL;
2725 /* Removes client from all channels it has joined. This is used when client
2726 connection is disconnected. If the client on a channel is last, the
2727 channel is removed as well. This sends the SIGNOFF notify types. */
2729 void silc_server_remove_from_channels(SilcServer server,
2730 SilcSocketConnection sock,
2731 SilcClientEntry client,
2733 const char *signoff_message,
2736 SilcChannelEntry channel;
2737 SilcChannelClientEntry chl;
2738 SilcHashTableList htl;
2741 SILC_LOG_DEBUG(("Start"));
2743 if (!client || !client->id)
2746 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2750 /* Remove the client from all channels. The client is removed from
2751 the channels' user list. */
2752 silc_hash_table_list(client->channels, &htl);
2753 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2754 channel = chl->channel;
2756 /* Remove channel if this is last client leaving the channel, unless
2757 the channel is permanent. */
2758 if (server->server_type == SILC_ROUTER &&
2759 silc_hash_table_count(channel->user_list) < 2) {
2760 silc_server_channel_delete(server, channel);
2764 silc_hash_table_del(client->channels, channel);
2765 silc_hash_table_del(channel->user_list, chl->client);
2766 channel->user_count--;
2768 /* If there is no global users on the channel anymore mark the channel
2769 as local channel. Do not check if the removed client is local client. */
2770 if (server->server_type != SILC_ROUTER && channel->global_users &&
2771 chl->client->router && !silc_server_channel_has_global(channel))
2772 channel->global_users = FALSE;
2775 server->stat.my_chanclients--;
2777 /* If there is not at least one local user on the channel then we don't
2778 need the channel entry anymore, we can remove it safely, unless the
2779 channel is permanent channel */
2780 if (server->server_type != SILC_ROUTER &&
2781 !silc_server_channel_has_local(channel)) {
2782 /* Notify about leaving client if this channel has global users. */
2783 if (notify && channel->global_users)
2784 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2785 SILC_NOTIFY_TYPE_SIGNOFF,
2786 signoff_message ? 2 : 1,
2787 clidp->data, clidp->len,
2788 signoff_message, signoff_message ?
2789 strlen(signoff_message) : 0);
2791 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2792 silc_server_channel_delete(server, channel);
2796 /* Send notify to channel about client leaving SILC and channel too */
2798 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2799 SILC_NOTIFY_TYPE_SIGNOFF,
2800 signoff_message ? 2 : 1,
2801 clidp->data, clidp->len,
2802 signoff_message, signoff_message ?
2803 strlen(signoff_message) : 0);
2805 /* Re-generate channel key if needed */
2806 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2807 if (!silc_server_create_channel_key(server, channel, 0))
2810 /* Send the channel key to the channel. The key of course is not sent
2811 to the client who was removed from the channel. */
2812 silc_server_send_channel_key(server, client->connection, channel,
2813 server->server_type == SILC_ROUTER ?
2814 FALSE : !server->standalone);
2818 silc_hash_table_list_reset(&htl);
2819 silc_buffer_free(clidp);
2822 /* Removes client from one channel. This is used for example when client
2823 calls LEAVE command to remove itself from the channel. Returns TRUE
2824 if channel still exists and FALSE if the channel is removed when
2825 last client leaves the channel. If `notify' is FALSE notify messages
2828 bool silc_server_remove_from_one_channel(SilcServer server,
2829 SilcSocketConnection sock,
2830 SilcChannelEntry channel,
2831 SilcClientEntry client,
2834 SilcChannelClientEntry chl;
2837 SILC_LOG_DEBUG(("Removing %s from channel %s",
2838 silc_id_render(client->id, SILC_ID_CLIENT),
2839 channel->channel_name));
2841 /* Get the entry to the channel, if this client is not on the channel
2843 if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
2846 /* Remove channel if this is last client leaving the channel, unless
2847 the channel is permanent. */
2848 if (server->server_type == SILC_ROUTER &&
2849 silc_hash_table_count(channel->user_list) < 2) {
2850 silc_server_channel_delete(server, channel);
2854 silc_hash_table_del(client->channels, chl->channel);
2855 silc_hash_table_del(channel->user_list, chl->client);
2856 channel->user_count--;
2858 /* If there is no global users on the channel anymore mark the channel
2859 as local channel. Do not check if the client is local client. */
2860 if (server->server_type != SILC_ROUTER && channel->global_users &&
2861 chl->client->router && !silc_server_channel_has_global(channel))
2862 channel->global_users = FALSE;
2865 server->stat.my_chanclients--;
2867 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2871 /* If there is not at least one local user on the channel then we don't
2872 need the channel entry anymore, we can remove it safely, unless the
2873 channel is permanent channel */
2874 if (server->server_type != SILC_ROUTER &&
2875 !silc_server_channel_has_local(channel)) {
2876 /* Notify about leaving client if this channel has global users. */
2877 if (notify && channel->global_users)
2878 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2879 SILC_NOTIFY_TYPE_LEAVE, 1,
2880 clidp->data, clidp->len);
2882 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2883 silc_server_channel_delete(server, channel);
2884 silc_buffer_free(clidp);
2888 /* Send notify to channel about client leaving the channel */
2890 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2891 SILC_NOTIFY_TYPE_LEAVE, 1,
2892 clidp->data, clidp->len);
2894 silc_buffer_free(clidp);
2898 /* Timeout callback. This is called if connection is idle or for some
2899 other reason is not responding within some period of time. This
2900 disconnects the remote end. */
2902 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2904 SilcServer server = (SilcServer)context;
2905 SilcSocketConnection sock = server->sockets[fd];
2906 SilcProtocolType protocol = 0;
2908 SILC_LOG_DEBUG(("Start"));
2913 SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
2914 sock->hostname, sock->ip));
2916 /* If we have protocol active we must assure that we call the protocol's
2917 final callback so that all the memory is freed. */
2918 if (sock->protocol) {
2919 protocol = sock->protocol->protocol->type;
2920 silc_protocol_cancel(sock->protocol, server->schedule);
2921 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2922 silc_protocol_execute_final(sock->protocol, server->schedule);
2923 sock->protocol = NULL;
2927 if (sock->user_data)
2928 silc_server_free_sock_user_data(server, sock, NULL);
2930 silc_server_disconnect_remote(server, sock,
2932 SILC_PROTOCOL_SERVER_CONNECTION_AUTH ?
2933 SILC_STATUS_ERR_AUTH_FAILED :
2934 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
2935 "Connection timeout");
2938 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2939 function may be used only by router. In real SILC network all channels
2940 are created by routers thus this function is never used by normal
2943 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2944 SilcServerID *router_id,
2950 SilcChannelID *channel_id;
2951 SilcChannelEntry entry;
2955 SILC_LOG_DEBUG(("Creating new channel"));
2958 cipher = SILC_DEFAULT_CIPHER;
2960 hmac = SILC_DEFAULT_HMAC;
2962 /* Allocate cipher */
2963 if (!silc_cipher_alloc(cipher, &key))
2967 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2968 silc_cipher_free(key);
2972 channel_name = strdup(channel_name);
2974 /* Create the channel ID */
2975 if (!silc_id_create_channel_id(server, router_id, server->rng,
2977 silc_free(channel_name);
2978 silc_cipher_free(key);
2979 silc_hmac_free(newhmac);
2983 /* Create the channel */
2984 entry = silc_idlist_add_channel(server->local_list, channel_name,
2985 SILC_CHANNEL_MODE_NONE, channel_id,
2986 NULL, key, newhmac, 0);
2988 silc_free(channel_name);
2989 silc_cipher_free(key);
2990 silc_hmac_free(newhmac);
2991 silc_free(channel_id);
2995 entry->cipher = strdup(cipher);
2996 entry->hmac_name = strdup(hmac);
2998 /* Now create the actual key material */
2999 if (!silc_server_create_channel_key(server, entry,
3000 silc_cipher_get_key_len(key) / 8)) {
3001 silc_idlist_del_channel(server->local_list, entry);
3005 /* Notify other routers about the new channel. We send the packet
3006 to our primary route. */
3007 if (broadcast && server->standalone == FALSE)
3008 silc_server_send_new_channel(server, server->router->connection, TRUE,
3009 channel_name, entry->id,
3010 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3013 server->stat.my_channels++;
3015 if (server->server_type == SILC_ROUTER)
3016 entry->users_resolved = TRUE;
3021 /* Same as above but creates the channel with Channel ID `channel_id. */
3024 silc_server_create_new_channel_with_id(SilcServer server,
3028 SilcChannelID *channel_id,
3031 SilcChannelEntry entry;
3035 SILC_LOG_DEBUG(("Creating new channel"));
3038 cipher = SILC_DEFAULT_CIPHER;
3040 hmac = SILC_DEFAULT_HMAC;
3042 /* Allocate cipher */
3043 if (!silc_cipher_alloc(cipher, &key))
3047 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3048 silc_cipher_free(key);
3052 channel_name = strdup(channel_name);
3054 /* Create the channel */
3055 entry = silc_idlist_add_channel(server->local_list, channel_name,
3056 SILC_CHANNEL_MODE_NONE, channel_id,
3057 NULL, key, newhmac, 0);
3059 silc_cipher_free(key);
3060 silc_hmac_free(newhmac);
3061 silc_free(channel_name);
3065 /* Now create the actual key material */
3066 if (!silc_server_create_channel_key(server, entry,
3067 silc_cipher_get_key_len(key) / 8)) {
3068 silc_idlist_del_channel(server->local_list, entry);
3072 /* Notify other routers about the new channel. We send the packet
3073 to our primary route. */
3074 if (broadcast && server->standalone == FALSE)
3075 silc_server_send_new_channel(server, server->router->connection, TRUE,
3076 channel_name, entry->id,
3077 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3080 server->stat.my_channels++;
3082 if (server->server_type == SILC_ROUTER)
3083 entry->users_resolved = TRUE;
3088 /* Channel's key re-key timeout callback. */
3090 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3092 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3093 SilcServer server = (SilcServer)rekey->context;
3097 if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3100 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3103 /* Generates new channel key. This is used to create the initial channel key
3104 but also to re-generate new key for channel. If `key_len' is provided
3105 it is the bytes of the key length. */
3107 bool silc_server_create_channel_key(SilcServer server,
3108 SilcChannelEntry channel,
3112 unsigned char channel_key[32], hash[32];
3115 SILC_LOG_DEBUG(("Generating channel key"));
3117 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3118 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3122 if (!channel->channel_key)
3123 if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3124 channel->channel_key = NULL;
3130 else if (channel->key_len)
3131 len = channel->key_len / 8;
3133 len = silc_cipher_get_key_len(channel->channel_key) / 8;
3135 /* Create channel key */
3136 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3139 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3141 /* Remove old key if exists */
3143 memset(channel->key, 0, channel->key_len / 8);
3144 silc_free(channel->key);
3148 channel->key_len = len * 8;
3149 channel->key = silc_memdup(channel_key, len);
3150 memset(channel_key, 0, sizeof(channel_key));
3152 /* Generate HMAC key from the channel key data and set it */
3154 silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3155 silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3156 silc_hmac_set_key(channel->hmac, hash,
3157 silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3158 memset(hash, 0, sizeof(hash));
3160 if (server->server_type == SILC_ROUTER) {
3161 if (!channel->rekey)
3162 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3163 channel->rekey->context = (void *)server;
3164 channel->rekey->channel = channel;
3165 channel->rekey->key_len = key_len;
3166 if (channel->rekey->task)
3167 silc_schedule_task_del(server->schedule, channel->rekey->task);
3169 channel->rekey->task =
3170 silc_schedule_task_add(server->schedule, 0,
3171 silc_server_channel_key_rekey,
3172 (void *)channel->rekey,
3173 server->config->channel_rekey_secs, 0,
3175 SILC_TASK_PRI_NORMAL);
3181 /* Saves the channel key found in the encoded `key_payload' buffer. This
3182 function is used when we receive Channel Key Payload and also when we're
3183 processing JOIN command reply. Returns entry to the channel. */
3185 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3186 SilcBuffer key_payload,
3187 SilcChannelEntry channel)
3189 SilcChannelKeyPayload payload = NULL;
3190 SilcChannelID *id = NULL;
3191 unsigned char *tmp, hash[32];
3195 SILC_LOG_DEBUG(("Start"));
3197 /* Decode channel key payload */
3198 payload = silc_channel_key_payload_parse(key_payload->data,
3201 SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3206 /* Get the channel entry */
3209 /* Get channel ID */
3210 tmp = silc_channel_key_get_id(payload, &tmp_len);
3211 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3217 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3219 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3221 SILC_LOG_ERROR(("Received key for non-existent channel %s",
3222 silc_id_render(id, SILC_ID_CHANNEL)));
3228 tmp = silc_channel_key_get_key(payload, &tmp_len);
3234 cipher = silc_channel_key_get_cipher(payload, NULL);
3240 /* Remove old key if exists */
3242 memset(channel->key, 0, channel->key_len / 8);
3243 silc_free(channel->key);
3244 silc_cipher_free(channel->channel_key);
3247 /* Create new cipher */
3248 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3249 channel->channel_key = NULL;
3254 if (channel->cipher)
3255 silc_free(channel->cipher);
3256 channel->cipher = strdup(cipher);
3259 channel->key_len = tmp_len * 8;
3260 channel->key = silc_memdup(tmp, tmp_len);
3261 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3263 /* Generate HMAC key from the channel key data and set it */
3265 silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3266 silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3267 silc_hmac_set_key(channel->hmac, hash,
3268 silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3270 memset(hash, 0, sizeof(hash));
3271 memset(tmp, 0, tmp_len);
3273 if (server->server_type == SILC_ROUTER) {
3274 if (!channel->rekey)
3275 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3276 channel->rekey->context = (void *)server;
3277 channel->rekey->channel = channel;
3278 if (channel->rekey->task)
3279 silc_schedule_task_del(server->schedule, channel->rekey->task);
3281 channel->rekey->task =
3282 silc_schedule_task_add(server->schedule, 0,
3283 silc_server_channel_key_rekey,
3284 (void *)channel->rekey,
3285 server->config->channel_rekey_secs, 0,
3287 SILC_TASK_PRI_NORMAL);
3293 silc_channel_key_payload_free(payload);
3298 /* Heartbeat callback. This function is set as argument for the
3299 silc_socket_set_heartbeat function. The library will call this function
3300 at the set time interval. */
3302 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3305 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
3307 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname, sock->ip));
3309 /* Send the heartbeat */
3310 silc_server_send_heartbeat(hb->server, sock);
3313 /* Returns assembled of all servers in the given ID list. The packet's
3314 form is dictated by the New ID payload. */
3316 static void silc_server_announce_get_servers(SilcServer server,
3317 SilcServerEntry remote,
3319 SilcBuffer *servers,
3320 unsigned long creation_time)
3322 SilcIDCacheList list;
3323 SilcIDCacheEntry id_cache;
3324 SilcServerEntry entry;
3327 /* Go through all clients in the list */
3328 if (silc_idcache_get_all(id_list->servers, &list)) {
3329 if (silc_idcache_list_first(list, &id_cache)) {
3331 entry = (SilcServerEntry)id_cache->context;
3333 /* Do not announce the one we've sending our announcements and
3334 do not announce ourself. Also check the creation time if it's
3336 if ((entry == remote) || (entry == server->id_entry) ||
3337 (creation_time && entry->data.created < creation_time)) {
3338 if (!silc_idcache_list_next(list, &id_cache))
3343 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3345 *servers = silc_buffer_realloc(*servers,
3347 (*servers)->truelen + idp->len :
3349 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3350 silc_buffer_put(*servers, idp->data, idp->len);
3351 silc_buffer_pull(*servers, idp->len);
3352 silc_buffer_free(idp);
3354 if (!silc_idcache_list_next(list, &id_cache))
3359 silc_idcache_list_free(list);
3364 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
3370 p = silc_notify_payload_encode(notify, argc, ap);
3376 /* This function is used by router to announce existing servers to our
3377 primary router when we've connected to it. If `creation_time' is non-zero
3378 then only the servers that has been created after the `creation_time'
3379 will be announced. */
3381 void silc_server_announce_servers(SilcServer server, bool global,
3382 unsigned long creation_time,
3383 SilcSocketConnection remote)
3385 SilcBuffer servers = NULL;
3387 SILC_LOG_DEBUG(("Announcing servers"));
3389 /* Get servers in local list */
3390 silc_server_announce_get_servers(server, remote->user_data,
3391 server->local_list, &servers,
3395 /* Get servers in global list */
3396 silc_server_announce_get_servers(server, remote->user_data,
3397 server->global_list, &servers,
3401 silc_buffer_push(servers, servers->data - servers->head);
3402 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3404 /* Send the packet */
3405 silc_server_packet_send(server, remote,
3406 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3407 servers->data, servers->len, TRUE);
3409 silc_buffer_free(servers);
3413 /* Returns assembled packet of all clients in the given ID list. The
3414 packet's form is dictated by the New ID Payload. */
3416 static void silc_server_announce_get_clients(SilcServer server,
3418 SilcBuffer *clients,
3420 unsigned long creation_time)
3422 SilcIDCacheList list;
3423 SilcIDCacheEntry id_cache;
3424 SilcClientEntry client;
3427 unsigned char mode[4];
3429 /* Go through all clients in the list */
3430 if (silc_idcache_get_all(id_list->clients, &list)) {
3431 if (silc_idcache_list_first(list, &id_cache)) {
3433 client = (SilcClientEntry)id_cache->context;
3435 if (creation_time && client->data.created < creation_time) {
3436 if (!silc_idcache_list_next(list, &id_cache))
3441 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3443 *clients = silc_buffer_realloc(*clients,
3445 (*clients)->truelen + idp->len :
3447 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3448 silc_buffer_put(*clients, idp->data, idp->len);
3449 silc_buffer_pull(*clients, idp->len);
3451 SILC_PUT32_MSB(client->mode, mode);
3452 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
3453 2, idp->data, idp->len,
3455 *umodes = silc_buffer_realloc(*umodes,
3457 (*umodes)->truelen + tmp->len :
3459 silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
3460 silc_buffer_put(*umodes, tmp->data, tmp->len);
3461 silc_buffer_pull(*umodes, tmp->len);
3462 silc_buffer_free(tmp);
3464 silc_buffer_free(idp);
3466 if (!silc_idcache_list_next(list, &id_cache))
3471 silc_idcache_list_free(list);
3475 /* This function is used to announce our existing clients to our router
3476 when we've connected to it. If `creation_time' is non-zero then only
3477 the clients that has been created after the `creation_time' will be
3480 void silc_server_announce_clients(SilcServer server,
3481 unsigned long creation_time,
3482 SilcSocketConnection remote)
3484 SilcBuffer clients = NULL;
3485 SilcBuffer umodes = NULL;
3487 SILC_LOG_DEBUG(("Announcing clients"));
3489 /* Get clients in local list */
3490 silc_server_announce_get_clients(server, server->local_list,
3491 &clients, &umodes, creation_time);
3493 /* As router we announce our global list as well */
3494 if (server->server_type == SILC_ROUTER)
3495 silc_server_announce_get_clients(server, server->global_list,
3496 &clients, &umodes, creation_time);
3499 silc_buffer_push(clients, clients->data - clients->head);
3500 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3502 /* Send the packet */
3503 silc_server_packet_send(server, remote,
3504 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3505 clients->data, clients->len, TRUE);
3507 silc_buffer_free(clients);
3511 silc_buffer_push(umodes, umodes->data - umodes->head);
3512 SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
3514 /* Send the packet */
3515 silc_server_packet_send(server, remote,
3516 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3517 umodes->data, umodes->len, TRUE);
3519 silc_buffer_free(umodes);
3523 /* Returns channel's topic for announcing it */
3525 void silc_server_announce_get_channel_topic(SilcServer server,
3526 SilcChannelEntry channel,
3531 if (channel->topic) {
3532 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3533 *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
3534 chidp->data, chidp->len,
3536 strlen(channel->topic));
3537 silc_buffer_free(chidp);
3541 /* Returns assembled packets for channel users of the `channel'. */
3543 void silc_server_announce_get_channel_users(SilcServer server,
3544 SilcChannelEntry channel,
3545 SilcBuffer *channel_users,
3546 SilcBuffer *channel_users_modes)
3548 SilcChannelClientEntry chl;
3549 SilcHashTableList htl;
3550 SilcBuffer chidp, clidp;
3553 unsigned char mode[4], *fkey = NULL;
3554 SilcUInt32 fkey_len = 0;
3556 SILC_LOG_DEBUG(("Start"));
3558 /* Now find all users on the channel */
3559 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3560 silc_hash_table_list(channel->user_list, &htl);
3561 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3562 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3565 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
3566 clidp->data, clidp->len,
3567 chidp->data, chidp->len);
3570 silc_buffer_realloc(*channel_users,
3572 (*channel_users)->truelen + len : len));
3573 silc_buffer_pull_tail(*channel_users,
3574 ((*channel_users)->end -
3575 (*channel_users)->data));
3577 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3578 silc_buffer_pull(*channel_users, len);
3579 silc_buffer_free(tmp);
3581 /* CUMODE notify for mode change on the channel */
3582 SILC_PUT32_MSB(chl->mode, mode);
3583 if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && channel->founder_key)
3584 fkey = silc_pkcs_public_key_encode(channel->founder_key, &fkey_len);
3585 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
3586 4, clidp->data, clidp->len,
3588 clidp->data, clidp->len,
3591 *channel_users_modes =
3592 silc_buffer_realloc(*channel_users_modes,
3593 (*channel_users_modes ?
3594 (*channel_users_modes)->truelen + len : len));
3595 silc_buffer_pull_tail(*channel_users_modes,
3596 ((*channel_users_modes)->end -
3597 (*channel_users_modes)->data));
3599 silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
3600 silc_buffer_pull(*channel_users_modes, len);
3601 silc_buffer_free(tmp);
3603 silc_buffer_free(clidp);
3605 silc_hash_table_list_reset(&htl);
3606 silc_buffer_free(chidp);
3609 /* Returns assembled packets for all channels and users on those channels
3610 from the given ID List. The packets are in the form dictated by the
3611 New Channel and New Channel User payloads. */
3613 void silc_server_announce_get_channels(SilcServer server,
3615 SilcBuffer *channels,
3616 SilcBuffer *channel_users,
3617 SilcBuffer **channel_users_modes,
3618 SilcUInt32 *channel_users_modes_c,
3619 SilcBuffer **channel_topics,
3620 SilcChannelID ***channel_ids,
3621 unsigned long creation_time)
3623 SilcIDCacheList list;
3624 SilcIDCacheEntry id_cache;
3625 SilcChannelEntry channel;
3628 SilcUInt16 name_len;
3630 int i = *channel_users_modes_c;
3633 SILC_LOG_DEBUG(("Start"));
3635 /* Go through all channels in the list */
3636 if (silc_idcache_get_all(id_list->channels, &list)) {
3637 if (silc_idcache_list_first(list, &id_cache)) {
3639 channel = (SilcChannelEntry)id_cache->context;
3641 if (creation_time && channel->created < creation_time)
3646 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3647 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3648 name_len = strlen(channel->channel_name);
3651 len = 4 + name_len + id_len + 4;
3653 silc_buffer_realloc(*channels,
3654 (*channels ? (*channels)->truelen +
3656 silc_buffer_pull_tail(*channels,
3657 ((*channels)->end - (*channels)->data));
3658 silc_buffer_format(*channels,
3659 SILC_STR_UI_SHORT(name_len),
3660 SILC_STR_UI_XNSTRING(channel->channel_name,
3662 SILC_STR_UI_SHORT(id_len),
3663 SILC_STR_UI_XNSTRING(cid, id_len),
3664 SILC_STR_UI_INT(channel->mode),
3666 silc_buffer_pull(*channels, len);
3669 /* Channel user modes */
3670 *channel_users_modes = silc_realloc(*channel_users_modes,
3671 sizeof(**channel_users_modes) *
3673 (*channel_users_modes)[i] = NULL;
3674 *channel_ids = silc_realloc(*channel_ids,
3675 sizeof(**channel_ids) * (i + 1));
3676 (*channel_ids)[i] = NULL;
3677 silc_server_announce_get_channel_users(server, channel,
3679 &(*channel_users_modes)[i]);
3680 (*channel_ids)[i] = channel->id;
3682 /* Channel's topic */
3683 *channel_topics = silc_realloc(*channel_topics,
3684 sizeof(**channel_topics) * (i + 1));
3685 (*channel_topics)[i] = NULL;
3686 silc_server_announce_get_channel_topic(server, channel,
3687 &(*channel_topics)[i]);
3690 if (!silc_idcache_list_next(list, &id_cache))
3694 *channel_users_modes_c += i;
3697 silc_idcache_list_free(list);
3701 /* This function is used to announce our existing channels to our router
3702 when we've connected to it. This also announces the users on the
3703 channels to the router. If the `creation_time' is non-zero only the
3704 channels that was created after the `creation_time' are announced.
3705 Note that the channel users are still announced even if the `creation_time'
3708 void silc_server_announce_channels(SilcServer server,
3709 unsigned long creation_time,
3710 SilcSocketConnection remote)
3712 SilcBuffer channels = NULL, channel_users = NULL;
3713 SilcBuffer *channel_users_modes = NULL;
3714 SilcBuffer *channel_topics = NULL;
3715 SilcUInt32 channel_users_modes_c = 0;
3716 SilcChannelID **channel_ids = NULL;
3718 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3720 /* Get channels and channel users in local list */
3721 silc_server_announce_get_channels(server, server->local_list,
3722 &channels, &channel_users,
3723 &channel_users_modes,
3724 &channel_users_modes_c,
3726 &channel_ids, creation_time);
3728 /* Get channels and channel users in global list */
3729 if (server->server_type != SILC_SERVER)
3730 silc_server_announce_get_channels(server, server->global_list,
3731 &channels, &channel_users,
3732 &channel_users_modes,
3733 &channel_users_modes_c,
3735 &channel_ids, creation_time);
3738 silc_buffer_push(channels, channels->data - channels->head);
3739 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3741 /* Send the packet */
3742 silc_server_packet_send(server, remote,
3743 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3744 channels->data, channels->len,
3747 silc_buffer_free(channels);
3750 if (channel_users) {
3751 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3752 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3753 channel_users->len);
3755 /* Send the packet */
3756 silc_server_packet_send(server, remote,
3757 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3758 channel_users->data, channel_users->len,
3761 silc_buffer_free(channel_users);
3764 if (channel_users_modes) {
3767 for (i = 0; i < channel_users_modes_c; i++) {
3768 if (!channel_users_modes[i])
3770 silc_buffer_push(channel_users_modes[i],
3771 channel_users_modes[i]->data -
3772 channel_users_modes[i]->head);
3773 SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
3774 channel_users_modes[i]->len);
3775 silc_server_packet_send_dest(server, remote,
3776 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3777 channel_ids[i], SILC_ID_CHANNEL,
3778 channel_users_modes[i]->data,
3779 channel_users_modes[i]->len,
3781 silc_buffer_free(channel_users_modes[i]);
3783 silc_free(channel_users_modes);
3786 if (channel_topics) {
3789 for (i = 0; i < channel_users_modes_c; i++) {
3790 if (!channel_topics[i])
3793 silc_buffer_push(channel_topics[i],
3794 channel_topics[i]->data -
3795 channel_topics[i]->head);
3796 SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
3797 channel_topics[i]->len);
3798 silc_server_packet_send_dest(server, remote,
3799 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3800 channel_ids[i], SILC_ID_CHANNEL,
3801 channel_topics[i]->data,
3802 channel_topics[i]->len,
3804 silc_buffer_free(channel_topics[i]);
3806 silc_free(channel_topics);
3809 silc_free(channel_ids);
3812 /* Failure timeout callback. If this is called then we will immediately
3813 process the received failure. We always process the failure with timeout
3814 since we do not want to blindly trust to received failure packets.
3815 This won't be called (the timeout is cancelled) if the failure was
3816 bogus (it is bogus if remote does not close the connection after sending
3819 SILC_TASK_CALLBACK(silc_server_failure_callback)
3821 SilcServerFailureContext f = (SilcServerFailureContext)context;
3823 if (f->sock->protocol) {
3824 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3825 silc_protocol_execute(f->sock->protocol, f->server->schedule, 0, 0);
3831 /* Assembles user list and users mode list from the `channel'. */
3833 void silc_server_get_users_on_channel(SilcServer server,
3834 SilcChannelEntry channel,
3835 SilcBuffer *user_list,
3836 SilcBuffer *mode_list,
3837 SilcUInt32 *user_count)
3839 SilcChannelClientEntry chl;
3840 SilcHashTableList htl;
3841 SilcBuffer client_id_list;
3842 SilcBuffer client_mode_list;
3844 SilcUInt32 list_count = 0, len = 0;
3846 silc_hash_table_list(channel->user_list, &htl);
3847 while (silc_hash_table_get(&htl, NULL, (void *)&chl))
3848 len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
3849 silc_hash_table_list_reset(&htl);
3851 client_id_list = silc_buffer_alloc(len);
3853 silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
3854 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3855 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3857 silc_hash_table_list(channel->user_list, &htl);
3858 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3860 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3861 silc_buffer_put(client_id_list, idp->data, idp->len);
3862 silc_buffer_pull(client_id_list, idp->len);
3863 silc_buffer_free(idp);
3865 /* Client's mode on channel */
3866 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3867 silc_buffer_pull(client_mode_list, 4);
3871 silc_hash_table_list_reset(&htl);
3872 silc_buffer_push(client_id_list,
3873 client_id_list->data - client_id_list->head);
3874 silc_buffer_push(client_mode_list,
3875 client_mode_list->data - client_mode_list->head);
3877 *user_list = client_id_list;
3878 *mode_list = client_mode_list;
3879 *user_count = list_count;
3882 /* Saves users and their modes to the `channel'. */
3884 void silc_server_save_users_on_channel(SilcServer server,
3885 SilcSocketConnection sock,
3886 SilcChannelEntry channel,
3887 SilcClientID *noadd,
3888 SilcBuffer user_list,
3889 SilcBuffer mode_list,
3890 SilcUInt32 user_count)
3895 SilcClientID *client_id;
3896 SilcClientEntry client;
3897 SilcIDCacheEntry cache;
3898 SilcChannelClientEntry chl;
3901 SILC_LOG_DEBUG(("Start"));
3903 for (i = 0; i < user_count; i++) {
3905 SILC_GET16_MSB(idp_len, user_list->data + 2);
3907 client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
3908 silc_buffer_pull(user_list, idp_len);
3913 SILC_GET32_MSB(mode, mode_list->data);
3914 silc_buffer_pull(mode_list, 4);
3916 if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3917 silc_free(client_id);
3923 /* Check if we have this client cached already. */
3924 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3925 server->server_type, &cache);
3927 client = silc_idlist_find_client_by_id(server->global_list,
3928 client_id, server->server_type,
3933 /* If router did not find such Client ID in its lists then this must
3934 be bogus client or some router in the net is buggy. */
3935 if (server->server_type == SILC_ROUTER) {
3936 silc_free(client_id);
3940 /* We don't have that client anywhere, add it. The client is added
3941 to global list since server didn't have it in the lists so it must be
3943 client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
3944 silc_id_dup(client_id, SILC_ID_CLIENT),
3945 sock->user_data, NULL, 0);
3947 SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
3948 silc_free(client_id);
3952 client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
3954 /* Found, if it is from global list we'll assure that we won't
3955 expire it now that the entry is on channel. */
3960 silc_free(client_id);
3962 if (!silc_server_client_on_channel(client, channel, &chl)) {
3963 /* Client was not on the channel, add it. */
3964 chl = silc_calloc(1, sizeof(*chl));
3965 chl->client = client;
3967 chl->channel = channel;
3968 silc_hash_table_add(channel->user_list, chl->client, chl);
3969 silc_hash_table_add(client->channels, chl->channel, chl);
3970 channel->user_count++;
3978 /* Saves channels and channels user modes to the `client'. Removes
3979 the client from those channels that are not sent in the list but
3982 void silc_server_save_user_channels(SilcServer server,
3983 SilcSocketConnection sock,
3984 SilcClientEntry client,
3985 SilcBuffer channels,
3986 SilcBuffer channels_user_modes)
3989 SilcUInt32 *chumodes;
3990 SilcChannelPayload entry;
3991 SilcChannelEntry channel;
3992 SilcChannelID *channel_id;
3993 SilcChannelClientEntry chl;
3994 SilcHashTable ht = NULL;
3995 SilcHashTableList htl;
3999 if (!channels ||!channels_user_modes)
4002 ch = silc_channel_payload_parse_list(channels->data, channels->len);
4003 if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4005 ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4006 NULL, NULL, NULL, TRUE);
4007 silc_dlist_start(ch);
4008 while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4009 /* Check if we have this channel, and add it if we don't have it.
4010 Also add the client on the channel unless it is there already. */
4011 channel_id = silc_channel_get_id_parse(entry);
4012 channel = silc_idlist_find_channel_by_id(server->local_list,
4015 channel = silc_idlist_find_channel_by_id(server->global_list,
4018 if (server->server_type != SILC_SERVER) {
4019 silc_free(channel_id);
4024 /* We don't have that channel anywhere, add it. */
4025 name = silc_channel_get_name(entry, NULL);
4026 channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4027 channel_id, server->router,
4030 silc_free(channel_id);
4037 channel->mode = silc_channel_get_mode(entry);
4039 /* Add the client on the channel */
4040 if (!silc_server_client_on_channel(client, channel, &chl)) {
4041 chl = silc_calloc(1, sizeof(*chl));
4042 chl->client = client;
4043 chl->mode = chumodes[i++];
4044 chl->channel = channel;
4045 silc_hash_table_add(channel->user_list, chl->client, chl);
4046 silc_hash_table_add(client->channels, chl->channel, chl);
4047 channel->user_count++;
4050 chl->mode = chumodes[i++];
4053 silc_hash_table_add(ht, channel, channel);
4054 silc_free(channel_id);
4056 silc_channel_payload_list_free(ch);
4057 silc_free(chumodes);
4061 /* Go through the list again and remove client from channels that
4062 are no part of the list. */
4064 silc_hash_table_list(client->channels, &htl);
4065 while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4066 if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4067 silc_hash_table_del(chl->channel->user_list, chl->client);
4068 silc_hash_table_del(chl->client->channels, chl->channel);
4072 silc_hash_table_list_reset(&htl);
4073 silc_hash_table_free(ht);
4075 silc_hash_table_list(client->channels, &htl);
4076 while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4077 silc_hash_table_del(chl->channel->user_list, chl->client);
4078 silc_hash_table_del(chl->client->channels, chl->channel);
4081 silc_hash_table_list_reset(&htl);
4085 /* Lookups route to the client indicated by the `id_data'. The connection
4086 object and internal data object is returned. Returns NULL if route
4087 could not be found to the client. If the `client_id' is specified then
4088 it is used and the `id_data' is ignored. */
4090 SilcSocketConnection
4091 silc_server_get_client_route(SilcServer server,
4092 unsigned char *id_data,
4094 SilcClientID *client_id,
4095 SilcIDListData *idata,
4096 SilcClientEntry *client_entry)
4099 SilcClientEntry client;
4101 SILC_LOG_DEBUG(("Start"));
4104 *client_entry = NULL;
4106 /* Decode destination Client ID */
4108 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4110 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4114 id = silc_id_dup(client_id, SILC_ID_CLIENT);
4117 /* If the destination belongs to our server we don't have to route
4118 the packet anywhere but to send it to the local destination. */
4119 client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4123 /* If we are router and the client has router then the client is in
4124 our cell but not directly connected to us. */
4125 if (server->server_type == SILC_ROUTER && client->router) {
4126 /* We are of course in this case the client's router thus the route
4127 to the client is the server who owns the client. So, we will send
4128 the packet to that server. */
4130 *idata = (SilcIDListData)client->router;
4131 return client->router->connection;
4134 /* Seems that client really is directly connected to us */
4136 *idata = (SilcIDListData)client;
4138 *client_entry = client;
4139 return client->connection;
4142 /* Destination belongs to someone not in this server. If we are normal
4143 server our action is to send the packet to our router. */
4144 if (server->server_type != SILC_ROUTER && !server->standalone) {
4147 *idata = (SilcIDListData)server->router;
4148 return server->router->connection;
4151 /* We are router and we will perform route lookup for the destination
4152 and send the packet to fastest route. */
4153 if (server->server_type == SILC_ROUTER && !server->standalone) {
4154 /* Check first that the ID is valid */
4155 client = silc_idlist_find_client_by_id(server->global_list, id,
4158 SilcSocketConnection dst_sock;
4160 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4164 *idata = (SilcIDListData)dst_sock->user_data;
4173 /* Encodes and returns channel list of channels the `client' has joined.
4174 Secret channels are not put to the list. */
4176 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4177 SilcClientEntry client,
4180 SilcBuffer *user_mode_list)
4182 SilcBuffer buffer = NULL;
4183 SilcChannelEntry channel;
4184 SilcChannelClientEntry chl;
4185 SilcHashTableList htl;
4188 SilcUInt16 name_len;
4192 *user_mode_list = NULL;
4194 silc_hash_table_list(client->channels, &htl);
4195 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4196 channel = chl->channel;
4198 if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4200 if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4203 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4204 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4205 name_len = strlen(channel->channel_name);
4207 len = 4 + name_len + id_len + 4;
4208 buffer = silc_buffer_realloc(buffer,
4209 (buffer ? buffer->truelen + len : len));
4210 silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4211 silc_buffer_format(buffer,
4212 SILC_STR_UI_SHORT(name_len),
4213 SILC_STR_UI_XNSTRING(channel->channel_name,
4215 SILC_STR_UI_SHORT(id_len),
4216 SILC_STR_UI_XNSTRING(cid, id_len),
4217 SILC_STR_UI_INT(chl->channel->mode),
4219 silc_buffer_pull(buffer, len);
4222 if (user_mode_list) {
4223 *user_mode_list = silc_buffer_realloc(*user_mode_list,
4225 (*user_mode_list)->truelen + 4 :
4227 silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
4228 (*user_mode_list)->data));
4229 SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
4230 silc_buffer_pull(*user_mode_list, 4);
4233 silc_hash_table_list_reset(&htl);
4236 silc_buffer_push(buffer, buffer->data - buffer->head);
4237 if (user_mode_list && *user_mode_list)
4238 silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
4239 (*user_mode_list)->head));
4244 /* Finds client entry by Client ID and if it is not found then resolves
4245 it using WHOIS command. */
4247 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
4248 SilcClientID *client_id,
4249 bool always_resolve,
4252 SilcClientEntry client;
4257 client = silc_idlist_find_client_by_id(server->local_list, client_id,
4260 client = silc_idlist_find_client_by_id(server->global_list,
4261 client_id, TRUE, NULL);
4262 if (!client && server->server_type == SILC_ROUTER)
4266 if (!client && server->standalone)
4269 if (!client || !client->nickname || !client->username ||
4271 SilcBuffer buffer, idp;
4274 client->data.status |= SILC_IDLIST_STATUS_RESOLVING;
4275 client->data.status &= ~SILC_IDLIST_STATUS_RESOLVED;
4276 client->resolve_cmd_ident = ++server->cmd_ident;
4279 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
4280 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
4281 server->cmd_ident, 1,
4282 4, idp->data, idp->len);
4283 silc_server_packet_send(server, client ? client->router->connection :
4284 server->router->connection,
4285 SILC_PACKET_COMMAND, 0,
4286 buffer->data, buffer->len, FALSE);
4287 silc_buffer_free(idp);
4288 silc_buffer_free(buffer);
4299 /* A timeout callback for the re-key. We will be the initiator of the
4302 SILC_TASK_CALLBACK(silc_server_rekey_callback)
4304 SilcSocketConnection sock = (SilcSocketConnection)context;
4305 SilcIDListData idata = (SilcIDListData)sock->user_data;
4306 SilcServer server = (SilcServer)idata->rekey->context;
4307 SilcProtocol protocol;
4308 SilcServerRekeyInternalContext *proto_ctx;
4310 SILC_LOG_DEBUG(("Start"));
4312 /* Allocate internal protocol context. This is sent as context
4314 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
4315 proto_ctx->server = (void *)server;
4316 proto_ctx->sock = sock;
4317 proto_ctx->responder = FALSE;
4318 proto_ctx->pfs = idata->rekey->pfs;
4320 /* Perform rekey protocol. Will call the final callback after the
4321 protocol is over. */
4322 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
4323 &protocol, proto_ctx, silc_server_rekey_final);
4324 sock->protocol = protocol;
4326 /* Run the protocol */
4327 silc_protocol_execute(protocol, server->schedule, 0, 0);
4329 /* Re-register re-key timeout */
4330 silc_schedule_task_add(server->schedule, sock->sock,
4331 silc_server_rekey_callback,
4332 context, idata->rekey->timeout, 0,
4333 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
4336 /* The final callback for the REKEY protocol. This will actually take the
4337 new key material into use. */
4339 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
4341 SilcProtocol protocol = (SilcProtocol)context;
4342 SilcServerRekeyInternalContext *ctx =
4343 (SilcServerRekeyInternalContext *)protocol->context;
4344 SilcServer server = (SilcServer)ctx->server;
4345 SilcSocketConnection sock = ctx->sock;
4347 SILC_LOG_DEBUG(("Start"));
4349 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
4350 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
4351 /* Error occured during protocol */
4352 SILC_LOG_ERROR(("Error occurred during rekey protocol"));
4353 silc_protocol_cancel(protocol, server->schedule);
4354 silc_protocol_free(protocol);
4355 sock->protocol = NULL;
4357 silc_packet_context_free(ctx->packet);
4359 silc_ske_free(ctx->ske);
4364 /* Purge the outgoing data queue to assure that all rekey packets really
4365 go to the network before we quit the protocol. */
4366 silc_server_packet_queue_purge(server, sock);
4369 silc_protocol_free(protocol);
4370 sock->protocol = NULL;
4372 silc_packet_context_free(ctx->packet);
4374 silc_ske_free(ctx->ske);
4378 /* Task callback used to retrieve network statistical information from
4379 router server once in a while. */
4381 SILC_TASK_CALLBACK(silc_server_get_stats)
4383 SilcServer server = (SilcServer)context;
4384 SilcBuffer idp, packet;
4386 SILC_LOG_DEBUG(("Retrieving stats from router"));
4388 if (!server->standalone) {
4389 idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
4390 packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
4391 ++server->cmd_ident, 1,
4392 1, idp->data, idp->len);
4393 silc_server_packet_send(server, server->router->connection,
4394 SILC_PACKET_COMMAND, 0, packet->data,
4395 packet->len, FALSE);
4396 silc_buffer_free(packet);
4397 silc_buffer_free(idp);
4400 silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
4401 server, 120, 0, SILC_TASK_TIMEOUT,