5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 1997 - 2001 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_router);
32 SILC_TASK_CALLBACK(silc_server_connect_to_router);
33 SILC_TASK_CALLBACK(silc_server_connect_to_router_second);
34 SILC_TASK_CALLBACK(silc_server_connect_to_router_final);
35 SILC_TASK_CALLBACK(silc_server_accept_new_connection);
36 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second);
37 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final);
38 SILC_TASK_CALLBACK(silc_server_packet_process);
39 SILC_TASK_CALLBACK(silc_server_packet_parse_real);
40 SILC_TASK_CALLBACK(silc_server_timeout_remote);
41 SILC_TASK_CALLBACK(silc_server_failure_callback);
42 SILC_TASK_CALLBACK(silc_server_rekey_callback);
44 /* Allocates a new SILC server object. This has to be done before the server
45 can be used. After allocation one must call silc_server_init to initialize
46 the server. The new allocated server object is returned to the new_server
49 int silc_server_alloc(SilcServer *new_server)
53 SILC_LOG_DEBUG(("Allocating new server object"));
55 server = silc_calloc(1, sizeof(*server));
56 server->server_type = SILC_SERVER;
57 server->standalone = TRUE;
58 server->local_list = silc_calloc(1, sizeof(*server->local_list));
59 server->global_list = silc_calloc(1, sizeof(*server->global_list));
60 server->pending_commands = silc_dlist_init();
62 server->sim = silc_dlist_init();
70 /* Free's the SILC server object. This is called at the very end before
73 void silc_server_free(SilcServer server)
80 if (server->local_list)
81 silc_free(server->local_list);
82 if (server->global_list)
83 silc_free(server->global_list);
85 silc_rng_free(server->rng);
88 while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
89 silc_dlist_del(server->sim, sim);
92 silc_dlist_uninit(server->sim);
96 silc_free(server->params);
98 if (server->pending_commands)
99 silc_dlist_uninit(server->pending_commands);
105 /* Initializes the entire SILC server. This is called always before running
106 the server. This is called only once at the initialization of the program.
107 This binds the server to its listenning port. After this function returns
108 one should call silc_server_run to start the server. This returns TRUE
109 when everything is ok to run the server. Configuration file must be
110 read and parsed before calling this. */
112 int silc_server_init(SilcServer server)
114 int *sock = NULL, sock_count = 0, i;
116 SilcServerEntry id_entry;
117 SilcIDListPurge purge;
119 SILC_LOG_DEBUG(("Initializing server"));
121 assert(server->config);
123 /* Set public and private keys */
124 if (!server->config->server_keys ||
125 !server->config->server_keys->public_key ||
126 !server->config->server_keys->private_key) {
127 SILC_LOG_ERROR(("Server public key and/or private key does not exist"));
130 server->public_key = server->config->server_keys->public_key;
131 server->private_key = server->config->server_keys->private_key;
133 /* XXX After server is made as Silc Server Library this can be given
134 as argument, for now this is hard coded */
135 server->params = silc_calloc(1, sizeof(*server->params));
136 server->params->retry_count = SILC_SERVER_RETRY_COUNT;
137 server->params->retry_interval_min = SILC_SERVER_RETRY_INTERVAL_MIN;
138 server->params->retry_interval_max = SILC_SERVER_RETRY_INTERVAL_MAX;
139 server->params->retry_keep_trying = FALSE;
140 server->params->protocol_timeout = 60;
141 server->params->require_reverse_mapping = FALSE;
143 /* Set log files where log message should be saved. */
144 server->config->server = server;
145 silc_server_config_setlogfiles(server->config);
147 /* Register all configured ciphers, PKCS and hash functions. */
148 silc_server_config_register_ciphers(server->config);
149 silc_server_config_register_pkcs(server->config);
150 silc_server_config_register_hashfuncs(server->config);
151 silc_server_config_register_hmacs(server->config);
153 /* Initialize random number generator for the server. */
154 server->rng = silc_rng_alloc();
155 silc_rng_init(server->rng);
156 silc_rng_global_init(server->rng);
158 /* Initialize hash functions for server to use */
159 silc_hash_alloc("md5", &server->md5hash);
160 silc_hash_alloc("sha1", &server->sha1hash);
162 /* Initialize none cipher */
163 silc_cipher_alloc("none", &server->none_cipher);
165 /* Create a listening server. Note that our server can listen on
166 multiple ports. All listeners are created here and now. */
167 /* XXX Still check this whether to use server_info or listen_port. */
169 while(server->config->listen_port) {
172 tmp = silc_net_create_server(server->config->listen_port->port,
173 server->config->listen_port->host);
177 sock = silc_realloc(sock, (sizeof(int *) * (sock_count + 1)));
178 sock[sock_count] = tmp;
179 server->config->listen_port = server->config->listen_port->next;
183 /* Initialize ID caches */
184 server->local_list->clients =
185 silc_idcache_alloc(0, silc_idlist_client_destructor);
186 server->local_list->servers = silc_idcache_alloc(0, NULL);
187 server->local_list->channels = silc_idcache_alloc(0, NULL);
189 /* These are allocated for normal server as well as these hold some
190 global information that the server has fetched from its router. For
191 router these are used as they are supposed to be used on router. */
192 server->global_list->clients =
193 silc_idcache_alloc(0, silc_idlist_client_destructor);
194 server->global_list->servers = silc_idcache_alloc(0, NULL);
195 server->global_list->channels = silc_idcache_alloc(0, NULL);
197 /* Allocate the entire socket list that is used in server. Eventually
198 all connections will have entry in this table (it is a table of
199 pointers to the actual object that is allocated individually
201 server->sockets = silc_calloc(SILC_SERVER_MAX_CONNECTIONS,
202 sizeof(*server->sockets));
204 for (i = 0; i < sock_count; i++) {
205 SilcSocketConnection newsocket = NULL;
207 /* Set socket to non-blocking mode */
208 silc_net_set_socket_nonblock(sock[i]);
209 server->sock = sock[i];
211 /* Create a Server ID for the server. */
212 silc_id_create_server_id(sock[i], server->rng, &id);
218 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
219 server->id_string_len = silc_id_get_len(id, SILC_ID_SERVER);
220 server->id_type = SILC_ID_SERVER;
221 server->server_name = server->config->server_info->server_name;
223 /* Add ourselves to the server list. We don't have a router yet
224 beacuse we haven't established a route yet. It will be done later.
225 For now, NULL is sent as router. This allocates new entry to
228 silc_idlist_add_server(server->local_list,
229 server->config->server_info->server_name,
230 server->server_type, server->id, NULL, NULL);
232 SILC_LOG_ERROR(("Could not add ourselves to cache"));
236 /* Add ourselves also to the socket table. The entry allocated above
237 is sent as argument for fast referencing in the future. */
238 silc_socket_alloc(sock[i], SILC_SOCKET_TYPE_SERVER, id_entry,
241 server->sockets[sock[i]] = newsocket;
243 /* Perform name and address lookups to resolve the listenning address
245 if (!silc_net_check_local_by_sock(sock[i], &newsocket->hostname,
247 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
249 SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
250 newsocket->hostname ? newsocket->hostname :
251 newsocket->ip ? newsocket->ip : ""));
252 server->stat.conn_failures++;
255 if (!newsocket->hostname)
256 newsocket->hostname = strdup(newsocket->ip);
258 newsocket->port = silc_net_get_local_port(sock[i]);
260 /* Put the allocated socket pointer also to the entry allocated above
261 for fast back-referencing to the socket list. */
262 id_entry->connection = (void *)server->sockets[sock[i]];
263 server->id_entry = id_entry;
266 /* Register the task queues. In SILC we have by default three task queues.
267 One task queue for non-timeout tasks which perform different kind of
268 I/O on file descriptors, timeout task queue for timeout tasks, and,
269 generic non-timeout task queue whose tasks apply to all connections. */
270 silc_task_queue_alloc(&server->io_queue, TRUE);
271 if (!server->io_queue) {
274 silc_task_queue_alloc(&server->timeout_queue, TRUE);
275 if (!server->timeout_queue) {
278 silc_task_queue_alloc(&server->generic_queue, TRUE);
279 if (!server->generic_queue) {
283 /* Register protocols */
284 silc_server_protocols_register();
286 /* Initialize the scheduler */
287 silc_schedule_init(&server->io_queue, &server->timeout_queue,
288 &server->generic_queue,
289 SILC_SERVER_MAX_CONNECTIONS);
291 /* Add the first task to the queue. This is task that is executed by
292 timeout. It expires as soon as the caller calls silc_server_run. This
293 task performs authentication protocol and key exchange with our
295 silc_task_register(server->timeout_queue, sock[0],
296 silc_server_connect_to_router,
297 (void *)server, 0, 1,
299 SILC_TASK_PRI_NORMAL);
301 /* Add listener task to the queue. This task receives new connections to the
302 server. This task remains on the queue until the end of the program. */
303 silc_task_register(server->io_queue, sock[0],
304 silc_server_accept_new_connection,
305 (void *)server, 0, 0,
307 SILC_TASK_PRI_NORMAL);
308 server->listenning = TRUE;
310 /* If server connections has been configured then we must be router as
311 normal server cannot have server connections, only router connections. */
312 if (server->config->servers)
313 server->server_type = SILC_ROUTER;
315 /* Register the ID Cache purge task. This periodically purges the ID cache
316 and removes the expired cache entries. */
318 /* Clients local list */
319 purge = silc_calloc(1, sizeof(*purge));
320 purge->cache = server->local_list->clients;
321 purge->timeout_queue = server->timeout_queue;
322 silc_task_register(purge->timeout_queue, 0,
324 (void *)purge, 600, 0,
325 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
327 /* Clients global list */
328 purge = silc_calloc(1, sizeof(*purge));
329 purge->cache = server->global_list->clients;
330 purge->timeout_queue = server->timeout_queue;
331 silc_task_register(purge->timeout_queue, 0,
333 (void *)purge, 300, 0,
334 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
336 SILC_LOG_DEBUG(("Server initialized"));
338 /* We are done here, return succesfully */
341 silc_task_queue_free(server->timeout_queue);
343 silc_task_queue_free(server->io_queue);
345 for (i = 0; i < sock_count; i++)
346 silc_net_close_server(sock[i]);
351 /* Fork server to background and set gid+uid to non-root.
352 Silcd will not run as root, so trying to set either user or group to
353 root will cause silcd to exit. */
355 void silc_server_daemonise(SilcServer server)
357 /* Are we executing silcd as root or a regular user? */
364 if (!server->config->identity || !server->config->identity->user ||
365 !server->config->identity->group) {
366 fprintf(stderr, "Error:"
367 "\tSILC server must not be run as root. For the security of your\n"
368 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
369 "\tuser account. Modify the [Identity] configuration section to run\n"
370 "\tthe server as non-root user.\n");
374 /* Get the values given for user and group in configuration file */
375 user=server->config->identity->user;
376 group=server->config->identity->group;
378 /* Check whether the user/group information is text */
379 if (atoi(user)!=0 || atoi(group)!=0) {
380 SILC_LOG_DEBUG(("Invalid user and/or group information"));
381 SILC_LOG_DEBUG(("User and/or group given as number"));
382 fprintf(stderr, "Invalid user and/or group information\n");
383 fprintf(stderr, "Please assign them as names, not numbers\n");
387 /* Catch the nasty incident of string "0" returning 0 from atoi */
388 if (strcmp("0", user)==0 || strcmp("0", group)==0) {
389 SILC_LOG_DEBUG(("User and/or group configured to 0. Unacceptable"));
390 fprintf(stderr, "User and/or group configured to 0. Exiting\n");
398 fprintf(stderr, "No such user %s found\n", user);
403 fprintf(stderr, "No such group %s found\n", group);
407 /* Check whether user and/or group is set to root. If yes, exit
408 immediately. Otherwise, setgid and setuid server to user.group */
409 if (gr->gr_gid==0 || pw->pw_uid==0) {
410 fprintf(stderr, "Error:"
411 "\tSILC server must not be run as root. For the security of your\n"
412 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
413 "\tuser account. Modify the [Identity] configuration section to run\n"
414 "\tthe server as non-root user.\n");
417 /* Fork server to background, making it a daemon */
419 SILC_LOG_DEBUG(("Server started as root. Dropping privileges."));
420 SILC_LOG_DEBUG(("Forking SILC server to background"));
425 SILC_LOG_DEBUG(("Changing to group %s", group));
426 if(setgid(gr->gr_gid)==0) {
427 SILC_LOG_DEBUG(("Setgid to %s", group));
429 SILC_LOG_DEBUG(("Setgid to %s failed", group));
430 fprintf(stderr, "Tried to setgid %s but no such group. Exiting\n",
434 SILC_LOG_DEBUG(("Changing to user nobody"));
435 if(setuid(pw->pw_uid)==0) {
436 SILC_LOG_DEBUG(("Setuid to %s", user));
438 SILC_LOG_DEBUG(("Setuid to %s failed", user));
439 fprintf(stderr, "Tried to setuid %s but no such user. Exiting\n",
445 /* Fork server to background, making it a daemon */
447 SILC_LOG_DEBUG(("Server started as user"));
448 SILC_LOG_DEBUG(("Forking SILC server to background"));
455 /* Stops the SILC server. This function is used to shutdown the server.
456 This is usually called after the scheduler has returned. After stopping
457 the server one should call silc_server_free. */
459 void silc_server_stop(SilcServer server)
461 SILC_LOG_DEBUG(("Stopping server"));
463 /* Stop the scheduler, although it might be already stopped. This
464 doesn't hurt anyone. This removes all the tasks and task queues,
466 silc_schedule_stop();
467 silc_schedule_uninit();
469 silc_server_protocols_unregister();
471 SILC_LOG_DEBUG(("Server stopped"));
474 /* The heart of the server. This runs the scheduler thus runs the server.
475 When this returns the server has been stopped and the program will
478 void silc_server_run(SilcServer server)
480 SILC_LOG_DEBUG(("Running server"));
482 /* Start the scheduler, the heart of the SILC server. When this returns
483 the program will be terminated. */
487 /* Timeout callback that will be called to retry connecting to remote
488 router. This is used by both normal and router server. This will wait
489 before retrying the connecting. The timeout is generated by exponential
490 backoff algorithm. */
492 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
494 SilcServerConnection sconn = (SilcServerConnection)context;
495 SilcServer server = sconn->server;
497 SILC_LOG_INFO(("Retrying connecting to a router"));
499 /* Calculate next timeout */
500 if (sconn->retry_count >= 1) {
501 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
502 if (sconn->retry_timeout > SILC_SERVER_RETRY_INTERVAL_MAX)
503 sconn->retry_timeout = SILC_SERVER_RETRY_INTERVAL_MAX;
505 sconn->retry_timeout = server->params->retry_interval_min;
507 sconn->retry_count++;
508 sconn->retry_timeout = sconn->retry_timeout +
509 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
511 /* If we've reached max retry count, give up. */
512 if (sconn->retry_count > server->params->retry_count &&
513 server->params->retry_keep_trying == FALSE) {
514 SILC_LOG_ERROR(("Could not connect to router, giving up"));
518 /* Wait one before retrying */
519 silc_task_register(server->timeout_queue, fd, silc_server_connect_router,
520 context, sconn->retry_timeout,
521 server->params->retry_interval_min_usec,
522 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
525 /* Generic routine to use connect to a router. */
527 SILC_TASK_CALLBACK(silc_server_connect_router)
529 SilcServerConnection sconn = (SilcServerConnection)context;
530 SilcServer server = sconn->server;
531 SilcSocketConnection newsocket;
532 SilcProtocol protocol;
533 SilcServerKEInternalContext *proto_ctx;
536 SILC_LOG_INFO(("Connecting to the router %s on port %d",
537 sconn->remote_host, sconn->remote_port));
539 /* Connect to remote host */
540 sock = silc_net_create_connection(sconn->remote_port,
543 SILC_LOG_ERROR(("Could not connect to router"));
544 silc_task_register(server->timeout_queue, fd,
545 silc_server_connect_to_router_retry,
546 context, 0, 1, SILC_TASK_TIMEOUT,
547 SILC_TASK_PRI_NORMAL);
551 /* Set socket options */
552 silc_net_set_socket_nonblock(sock);
553 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
555 /* Create socket connection for the connection. Even though we
556 know that we are connecting to a router we will mark the socket
557 to be unknown connection until we have executed authentication
559 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
560 server->sockets[sock] = newsocket;
561 newsocket->hostname = strdup(sconn->remote_host);
562 newsocket->ip = strdup(sconn->remote_host);
563 newsocket->port = sconn->remote_port;
564 sconn->sock = newsocket;
566 /* Allocate internal protocol context. This is sent as context
568 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
569 proto_ctx->server = (void *)server;
570 proto_ctx->context = (void *)sconn;
571 proto_ctx->sock = newsocket;
572 proto_ctx->rng = server->rng;
573 proto_ctx->responder = FALSE;
575 /* Perform key exchange protocol. silc_server_connect_to_router_second
576 will be called after the protocol is finished. */
577 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
578 &protocol, proto_ctx,
579 silc_server_connect_to_router_second);
580 newsocket->protocol = protocol;
582 /* Register a timeout task that will be executed if the protocol
583 is not executed within set limit. */
584 proto_ctx->timeout_task =
585 silc_task_register(server->timeout_queue, sock,
586 silc_server_timeout_remote,
587 server, server->params->protocol_timeout,
588 server->params->protocol_timeout_usec,
592 /* Register the connection for network input and output. This sets
593 that scheduler will listen for incoming packets for this connection
594 and sets that outgoing packets may be sent to this connection as
595 well. However, this doesn't set the scheduler for outgoing traffic,
596 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
597 later when outgoing data is available. */
598 context = (void *)server;
599 SILC_REGISTER_CONNECTION_FOR_IO(sock);
601 /* Run the protocol */
602 protocol->execute(server->timeout_queue, 0, protocol, sock, 0, 0);
605 /* This function connects to our primary router or if we are a router this
606 establishes all our primary routes. This is called at the start of the
607 server to do authentication and key exchange with our router - called
610 SILC_TASK_CALLBACK(silc_server_connect_to_router)
612 SilcServer server = (SilcServer)context;
613 SilcServerConnection sconn;
615 SILC_LOG_DEBUG(("Connecting to router(s)"));
617 /* If we are normal SILC server we need to connect to our cell's
619 if (server->server_type == SILC_SERVER) {
620 SILC_LOG_DEBUG(("We are normal server"));
622 /* Create connection to the router, if configured. */
623 if (server->config->routers) {
625 /* Allocate connection object for hold connection specific stuff. */
626 sconn = silc_calloc(1, sizeof(*sconn));
627 sconn->server = server;
628 sconn->remote_host = strdup(server->config->routers->host);
629 sconn->remote_port = server->config->routers->port;
631 silc_task_register(server->timeout_queue, fd,
632 silc_server_connect_router,
633 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
634 SILC_TASK_PRI_NORMAL);
639 /* If we are a SILC router we need to establish all of our primary
641 if (server->server_type == SILC_ROUTER) {
642 SilcServerConfigSectionServerConnection *ptr;
644 SILC_LOG_DEBUG(("We are router"));
646 /* Create the connections to all our routes */
647 ptr = server->config->routers;
650 SILC_LOG_DEBUG(("Router connection [%s] %s:%d",
651 ptr->initiator ? "Initiator" : "Responder",
652 ptr->host, ptr->port));
654 if (ptr->initiator) {
655 /* Allocate connection object for hold connection specific stuff. */
656 sconn = silc_calloc(1, sizeof(*sconn));
657 sconn->server = server;
658 sconn->remote_host = strdup(ptr->host);
659 sconn->remote_port = ptr->port;
661 silc_task_register(server->timeout_queue, fd,
662 silc_server_connect_router,
663 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
664 SILC_TASK_PRI_NORMAL);
674 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
676 /* There wasn't a configured router, we will continue but we don't
677 have a connection to outside world. We will be standalone server. */
678 server->standalone = TRUE;
681 /* Second part of connecting to router(s). Key exchange protocol has been
682 executed and now we will execute authentication protocol. */
684 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
686 SilcProtocol protocol = (SilcProtocol)context;
687 SilcServerKEInternalContext *ctx =
688 (SilcServerKEInternalContext *)protocol->context;
689 SilcServer server = (SilcServer)ctx->server;
690 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
691 SilcSocketConnection sock = server->sockets[fd];
692 SilcServerConnAuthInternalContext *proto_ctx;
693 SilcServerConfigSectionServerConnection *conn = NULL;
695 SILC_LOG_DEBUG(("Start"));
697 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
698 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
699 /* Error occured during protocol */
700 silc_protocol_free(protocol);
701 sock->protocol = NULL;
702 silc_ske_free_key_material(ctx->keymat);
704 silc_packet_context_free(ctx->packet);
706 silc_ske_free(ctx->ske);
708 silc_free(ctx->dest_id);
710 silc_task_unregister_by_callback(server->timeout_queue,
711 silc_server_failure_callback);
712 silc_server_disconnect_remote(server, sock, "Server closed connection: "
713 "Key exchange failed");
717 /* We now have the key material as the result of the key exchange
718 protocol. Take the key material into use. Free the raw key material
719 as soon as we've set them into use. */
720 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
721 ctx->ske->prop->cipher,
722 ctx->ske->prop->pkcs,
723 ctx->ske->prop->hash,
724 ctx->ske->prop->hmac,
725 ctx->ske->prop->group,
727 silc_protocol_free(protocol);
728 sock->protocol = NULL;
729 silc_ske_free_key_material(ctx->keymat);
731 silc_packet_context_free(ctx->packet);
733 silc_ske_free(ctx->ske);
735 silc_free(ctx->dest_id);
737 silc_task_unregister_by_callback(server->timeout_queue,
738 silc_server_failure_callback);
739 silc_server_disconnect_remote(server, sock, "Server closed connection: "
740 "Key exchange failed");
743 silc_ske_free_key_material(ctx->keymat);
745 /* Allocate internal context for the authentication protocol. This
746 is sent as context for the protocol. */
747 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
748 proto_ctx->server = (void *)server;
749 proto_ctx->context = (void *)sconn;
750 proto_ctx->sock = sock;
751 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
752 proto_ctx->dest_id_type = ctx->dest_id_type;
753 proto_ctx->dest_id = ctx->dest_id;
755 /* Resolve the authentication method used in this connection. Check if
756 we find a match from user configured connections */
757 conn = silc_server_config_find_router_conn(server->config,
761 /* Match found. Use the configured authentication method */
762 proto_ctx->auth_meth = conn->auth_meth;
763 if (conn->auth_data) {
764 proto_ctx->auth_data = strdup(conn->auth_data);
765 proto_ctx->auth_data_len = strlen(conn->auth_data);
768 SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
769 sock->hostname, sock->ip, sock->port));
770 silc_protocol_free(protocol);
771 sock->protocol = NULL;
773 silc_packet_context_free(ctx->packet);
775 silc_ske_free(ctx->ske);
777 silc_free(ctx->dest_id);
779 silc_task_unregister_by_callback(server->timeout_queue,
780 silc_server_failure_callback);
781 silc_server_disconnect_remote(server, sock, "Server closed connection: "
782 "Key exchange failed");
786 /* Free old protocol as it is finished now */
787 silc_protocol_free(protocol);
789 silc_packet_context_free(ctx->packet);
791 sock->protocol = NULL;
793 /* Allocate the authentication protocol. This is allocated here
794 but we won't start it yet. We will be receiving party of this
795 protocol thus we will wait that connecting party will make
797 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
798 &sock->protocol, proto_ctx,
799 silc_server_connect_to_router_final);
801 /* Register timeout task. If the protocol is not executed inside
802 this timelimit the connection will be terminated. Currently
803 this is 15 seconds and is hard coded limit (XXX). */
804 proto_ctx->timeout_task =
805 silc_task_register(server->timeout_queue, sock->sock,
806 silc_server_timeout_remote,
807 (void *)server, 15, 0,
811 /* Run the protocol */
812 sock->protocol->execute(server->timeout_queue, 0,
813 sock->protocol, sock->sock, 0, 0);
816 /* Finalizes the connection to router. Registers a server task to the
817 queue so that we can accept new connections. */
819 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
821 SilcProtocol protocol = (SilcProtocol)context;
822 SilcServerConnAuthInternalContext *ctx =
823 (SilcServerConnAuthInternalContext *)protocol->context;
824 SilcServer server = (SilcServer)ctx->server;
825 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
826 SilcSocketConnection sock = ctx->sock;
827 SilcServerEntry id_entry;
829 SilcServerHBContext hb_context;
830 unsigned char *id_string;
832 SilcIDListData idata;
834 SILC_LOG_DEBUG(("Start"));
836 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
837 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
838 /* Error occured during protocol */
840 silc_free(ctx->dest_id);
841 silc_server_disconnect_remote(server, sock, "Server closed connection: "
842 "Authentication failed");
846 /* Add a task to the queue. This task receives new connections to the
847 server. This task remains on the queue until the end of the program. */
848 if (!server->listenning) {
849 silc_task_register(server->io_queue, server->sock,
850 silc_server_accept_new_connection,
851 (void *)server, 0, 0,
853 SILC_TASK_PRI_NORMAL);
854 server->listenning = TRUE;
857 /* Send NEW_SERVER packet to the router. We will become registered
858 to the SILC network after sending this packet. */
859 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
860 id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
861 packet = silc_buffer_alloc(2 + 2 + id_len + strlen(server->server_name));
862 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
863 silc_buffer_format(packet,
864 SILC_STR_UI_SHORT(id_len),
865 SILC_STR_UI_XNSTRING(id_string, id_len),
866 SILC_STR_UI_SHORT(strlen(server->server_name)),
867 SILC_STR_UI_XNSTRING(server->server_name,
868 strlen(server->server_name)),
871 /* Send the packet */
872 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
873 packet->data, packet->len, TRUE);
874 silc_buffer_free(packet);
875 silc_free(id_string);
877 SILC_LOG_DEBUG(("Connected to router %s", sock->hostname));
879 /* Add the connected router to local server list */
880 server->standalone = FALSE;
881 id_entry = silc_idlist_add_server(server->local_list, strdup(sock->hostname),
882 SILC_ROUTER, ctx->dest_id, NULL, sock);
885 silc_free(ctx->dest_id);
886 silc_server_disconnect_remote(server, sock, "Server closed connection: "
887 "Authentication failed");
891 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
892 silc_free(sock->user_data);
893 sock->user_data = (void *)id_entry;
894 sock->type = SILC_SOCKET_TYPE_ROUTER;
895 server->id_entry->router = id_entry;
896 server->router = id_entry;
897 idata = (SilcIDListData)sock->user_data;
898 idata->registered = TRUE;
900 /* Perform keepalive. The `hb_context' will be freed automatically
901 when finally calling the silc_socket_free function. XXX hardcoded
903 hb_context = silc_calloc(1, sizeof(*hb_context));
904 hb_context->server = server;
905 silc_socket_set_heartbeat(sock, 600, hb_context,
906 silc_server_perform_heartbeat,
907 server->timeout_queue);
909 /* Register re-key timeout */
910 idata->rekey->timeout = 3600; /* XXX hardcoded */
911 idata->rekey->context = (void *)server;
912 silc_task_register(server->timeout_queue, sock->sock,
913 silc_server_rekey_callback,
914 (void *)sock, idata->rekey->timeout, 0,
915 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
917 /* If we are router then announce our possible servers. */
918 if (server->server_type == SILC_ROUTER)
919 silc_server_announce_servers(server);
921 /* Announce our clients and channels to the router */
922 silc_server_announce_clients(server);
923 silc_server_announce_channels(server);
926 /* Free the temporary connection data context */
928 silc_free(sconn->remote_host);
932 /* Free the protocol object */
933 silc_protocol_free(protocol);
935 silc_packet_context_free(ctx->packet);
937 silc_ske_free(ctx->ske);
939 sock->protocol = NULL;
942 /* Accepts new connections to the server. Accepting new connections are
943 done in three parts to make it async. */
945 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
947 SilcServer server = (SilcServer)context;
948 SilcSocketConnection newsocket;
949 SilcServerKEInternalContext *proto_ctx;
951 void *cconfig, *sconfig, *rconfig;
952 SilcServerConfigSectionDenyConnection *deny;
954 SILC_LOG_DEBUG(("Accepting new connection"));
956 server->stat.conn_attempts++;
958 sock = silc_net_accept_connection(server->sock);
960 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
961 server->stat.conn_failures++;
965 /* Check max connections */
966 if (sock > SILC_SERVER_MAX_CONNECTIONS) {
967 SILC_LOG_ERROR(("Refusing connection, server is full"));
968 server->stat.conn_failures++;
972 /* Set socket options */
973 silc_net_set_socket_nonblock(sock);
974 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
976 /* We don't create a ID yet, since we don't know what type of connection
977 this is yet. But, we do add the connection to the socket table. */
978 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
979 server->sockets[sock] = newsocket;
981 /* XXX This MUST be done async as this will block the entire server
982 process. Either we have to do our own resolver stuff or in the future
983 we can use threads. */
984 /* Perform name and address lookups for the remote host. */
985 if (!silc_net_check_host_by_sock(sock, &newsocket->hostname,
987 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
989 SILC_LOG_ERROR(("IP/DNS lookup failed %s",
990 newsocket->hostname ? newsocket->hostname :
991 newsocket->ip ? newsocket->ip : ""));
992 server->stat.conn_failures++;
995 if (!newsocket->hostname)
996 newsocket->hostname = strdup(newsocket->ip);
998 newsocket->port = silc_net_get_remote_port(sock);
1000 /* Register the connection for network input and output. This sets
1001 that scheduler will listen for incoming packets for this connection
1002 and sets that outgoing packets may be sent to this connection as well.
1003 However, this doesn't set the scheduler for outgoing traffic, it
1004 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1005 later when outgoing data is available. */
1006 SILC_REGISTER_CONNECTION_FOR_IO(sock);
1008 port = server->sockets[fd]->port; /* Listenning port */
1010 /* Check whether this connection is denied to connect to us. */
1011 deny = silc_server_config_denied_conn(server->config, newsocket->ip, port);
1013 deny = silc_server_config_denied_conn(server->config, newsocket->hostname,
1016 /* The connection is denied */
1017 silc_server_disconnect_remote(server, newsocket, deny->comment ?
1019 "Server closed connection: "
1020 "Connection refused");
1021 server->stat.conn_failures++;
1025 /* Check whether we have configred this sort of connection at all. We
1026 have to check all configurations since we don't know what type of
1027 connection this is. */
1028 if (!(cconfig = silc_server_config_find_client_conn(server->config,
1029 newsocket->ip, port)))
1030 cconfig = silc_server_config_find_client_conn(server->config,
1031 newsocket->hostname,
1033 if (!(sconfig = silc_server_config_find_server_conn(server->config,
1036 sconfig = silc_server_config_find_server_conn(server->config,
1037 newsocket->hostname,
1039 if (!(rconfig = silc_server_config_find_router_conn(server->config,
1040 newsocket->ip, port)))
1041 rconfig = silc_server_config_find_router_conn(server->config,
1042 newsocket->hostname,
1044 if (!cconfig && !sconfig && !rconfig) {
1045 silc_server_disconnect_remote(server, newsocket,
1046 "Server closed connection: "
1047 "Connection refused");
1048 server->stat.conn_failures++;
1052 /* The connection is allowed */
1054 SILC_LOG_INFO(("Incoming connection from %s (%s)", newsocket->hostname,
1057 /* Allocate internal context for key exchange protocol. This is
1058 sent as context for the protocol. */
1059 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1060 proto_ctx->server = context;
1061 proto_ctx->sock = newsocket;
1062 proto_ctx->rng = server->rng;
1063 proto_ctx->responder = TRUE;
1064 proto_ctx->cconfig = cconfig;
1065 proto_ctx->sconfig = sconfig;
1066 proto_ctx->rconfig = rconfig;
1068 /* Prepare the connection for key exchange protocol. We allocate the
1069 protocol but will not start it yet. The connector will be the
1070 initiator of the protocol thus we will wait for initiation from
1071 there before we start the protocol. */
1072 server->stat.auth_attempts++;
1073 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1074 &newsocket->protocol, proto_ctx,
1075 silc_server_accept_new_connection_second);
1077 /* Register a timeout task that will be executed if the connector
1078 will not start the key exchange protocol within 60 seconds. For
1079 now, this is a hard coded limit. After 60 secs the connection will
1080 be closed if the key exchange protocol has not been started. */
1081 proto_ctx->timeout_task =
1082 silc_task_register(server->timeout_queue, newsocket->sock,
1083 silc_server_timeout_remote,
1089 /* Second part of accepting new connection. Key exchange protocol has been
1090 performed and now it is time to do little connection authentication
1091 protocol to figure out whether this connection is client or server
1092 and whether it has right to access this server (especially server
1093 connections needs to be authenticated). */
1095 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1097 SilcProtocol protocol = (SilcProtocol)context;
1098 SilcServerKEInternalContext *ctx =
1099 (SilcServerKEInternalContext *)protocol->context;
1100 SilcServer server = (SilcServer)ctx->server;
1101 SilcSocketConnection sock = server->sockets[fd];
1102 SilcServerConnAuthInternalContext *proto_ctx;
1104 SILC_LOG_DEBUG(("Start"));
1106 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1107 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1108 /* Error occured during protocol */
1109 silc_protocol_free(protocol);
1110 sock->protocol = NULL;
1111 silc_ske_free_key_material(ctx->keymat);
1113 silc_packet_context_free(ctx->packet);
1115 silc_ske_free(ctx->ske);
1117 silc_free(ctx->dest_id);
1119 silc_task_unregister_by_callback(server->timeout_queue,
1120 silc_server_failure_callback);
1121 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1122 "Key exchange failed");
1123 server->stat.auth_failures++;
1127 /* We now have the key material as the result of the key exchange
1128 protocol. Take the key material into use. Free the raw key material
1129 as soon as we've set them into use. */
1130 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
1131 ctx->ske->prop->cipher,
1132 ctx->ske->prop->pkcs,
1133 ctx->ske->prop->hash,
1134 ctx->ske->prop->hmac,
1135 ctx->ske->prop->group,
1137 silc_protocol_free(protocol);
1138 sock->protocol = NULL;
1139 silc_ske_free_key_material(ctx->keymat);
1141 silc_packet_context_free(ctx->packet);
1143 silc_ske_free(ctx->ske);
1145 silc_free(ctx->dest_id);
1147 silc_task_unregister_by_callback(server->timeout_queue,
1148 silc_server_failure_callback);
1149 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1150 "Key exchange failed");
1151 server->stat.auth_failures++;
1154 silc_ske_free_key_material(ctx->keymat);
1156 /* Allocate internal context for the authentication protocol. This
1157 is sent as context for the protocol. */
1158 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1159 proto_ctx->server = (void *)server;
1160 proto_ctx->sock = sock;
1161 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
1162 proto_ctx->responder = TRUE;
1163 proto_ctx->dest_id_type = ctx->dest_id_type;
1164 proto_ctx->dest_id = ctx->dest_id;
1165 proto_ctx->cconfig = ctx->cconfig;
1166 proto_ctx->sconfig = ctx->sconfig;
1167 proto_ctx->rconfig = ctx->rconfig;
1169 /* Free old protocol as it is finished now */
1170 silc_protocol_free(protocol);
1172 silc_packet_context_free(ctx->packet);
1174 sock->protocol = NULL;
1176 /* Allocate the authentication protocol. This is allocated here
1177 but we won't start it yet. We will be receiving party of this
1178 protocol thus we will wait that connecting party will make
1179 their first move. */
1180 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1181 &sock->protocol, proto_ctx,
1182 silc_server_accept_new_connection_final);
1184 /* Register timeout task. If the protocol is not executed inside
1185 this timelimit the connection will be terminated. Currently
1186 this is 60 seconds and is hard coded limit (XXX). */
1187 proto_ctx->timeout_task =
1188 silc_task_register(server->timeout_queue, sock->sock,
1189 silc_server_timeout_remote,
1190 (void *)server, 60, 0,
1195 /* Final part of accepting new connection. The connection has now
1196 been authenticated and keys has been exchanged. We also know whether
1197 this is client or server connection. */
1199 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1201 SilcProtocol protocol = (SilcProtocol)context;
1202 SilcServerConnAuthInternalContext *ctx =
1203 (SilcServerConnAuthInternalContext *)protocol->context;
1204 SilcServer server = (SilcServer)ctx->server;
1205 SilcSocketConnection sock = ctx->sock;
1206 SilcServerHBContext hb_context;
1207 void *id_entry = NULL;
1209 SILC_LOG_DEBUG(("Start"));
1211 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1212 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1213 /* Error occured during protocol */
1214 silc_protocol_free(protocol);
1215 sock->protocol = NULL;
1217 silc_packet_context_free(ctx->packet);
1219 silc_ske_free(ctx->ske);
1221 silc_free(ctx->dest_id);
1224 sock->protocol = NULL;
1225 silc_task_unregister_by_callback(server->timeout_queue,
1226 silc_server_failure_callback);
1227 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1228 "Authentication failed");
1229 server->stat.auth_failures++;
1233 sock->type = ctx->conn_type;
1234 switch(sock->type) {
1235 case SILC_SOCKET_TYPE_CLIENT:
1237 SilcClientEntry client;
1239 SILC_LOG_DEBUG(("Remote host is client"));
1240 SILC_LOG_INFO(("Connection from %s (%s) is client", sock->hostname,
1243 /* Add the client to the client ID cache. The nickname and Client ID
1244 and other information is created after we have received NEW_CLIENT
1245 packet from client. */
1246 client = silc_idlist_add_client(server->local_list,
1247 NULL, 0, NULL, NULL, NULL, NULL, sock);
1249 SILC_LOG_ERROR(("Could not add new client to cache"));
1250 silc_free(sock->user_data);
1255 server->stat.my_clients++;
1256 server->stat.clients++;
1257 if (server->server_type == SILC_ROUTER)
1258 server->stat.cell_clients++;
1260 id_entry = (void *)client;
1263 case SILC_SOCKET_TYPE_SERVER:
1264 case SILC_SOCKET_TYPE_ROUTER:
1266 SilcServerEntry new_server;
1267 SilcServerConfigSectionServerConnection *conn =
1268 sock->type == SILC_SOCKET_TYPE_SERVER ? ctx->sconfig : ctx->rconfig;
1270 SILC_LOG_DEBUG(("Remote host is %s",
1271 sock->type == SILC_SOCKET_TYPE_SERVER ?
1272 "server" : "router"));
1273 SILC_LOG_INFO(("Connection from %s (%s) is %s", sock->hostname,
1274 sock->ip, sock->type == SILC_SOCKET_TYPE_SERVER ?
1275 "server" : "router"));
1277 /* Add the server into server cache. The server name and Server ID
1278 is updated after we have received NEW_SERVER packet from the
1279 server. We mark ourselves as router for this server if we really
1282 silc_idlist_add_server(server->local_list, NULL,
1283 sock->type == SILC_SOCKET_TYPE_SERVER ?
1284 SILC_SERVER : SILC_ROUTER, NULL,
1285 sock->type == SILC_SOCKET_TYPE_SERVER ?
1286 server->id_entry : NULL, sock);
1288 SILC_LOG_ERROR(("Could not add new server to cache"));
1289 silc_free(sock->user_data);
1294 if (sock->type == SILC_SOCKET_TYPE_SERVER)
1295 server->stat.my_servers++;
1297 server->stat.my_routers++;
1298 server->stat.servers++;
1300 id_entry = (void *)new_server;
1302 /* Check whether this connection is to be our primary router connection
1303 if we dont' already have the primary route. */
1304 if (server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER) {
1305 if (silc_server_config_is_primary_route(server->config) &&
1309 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1310 server->standalone = FALSE;
1311 if (!server->id_entry->router) {
1312 server->id_entry->router = id_entry;
1313 server->router = id_entry;
1323 /* Add the common data structure to the ID entry. */
1325 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1327 /* Add to sockets internal pointer for fast referencing */
1328 silc_free(sock->user_data);
1329 sock->user_data = id_entry;
1331 /* Connection has been fully established now. Everything is ok. */
1332 SILC_LOG_DEBUG(("New connection authenticated"));
1334 /* Perform keepalive. The `hb_context' will be freed automatically
1335 when finally calling the silc_socket_free function. XXX hardcoded
1337 hb_context = silc_calloc(1, sizeof(*hb_context));
1338 hb_context->server = server;
1339 silc_socket_set_heartbeat(sock, 600, hb_context,
1340 silc_server_perform_heartbeat,
1341 server->timeout_queue);
1343 silc_task_unregister_by_callback(server->timeout_queue,
1344 silc_server_failure_callback);
1345 silc_protocol_free(protocol);
1347 silc_packet_context_free(ctx->packet);
1349 silc_ske_free(ctx->ske);
1351 silc_free(ctx->dest_id);
1353 sock->protocol = NULL;
1356 /* This function is used to read packets from network and send packets to
1357 network. This is usually a generic task. */
1359 SILC_TASK_CALLBACK(silc_server_packet_process)
1361 SilcServer server = (SilcServer)context;
1362 SilcSocketConnection sock = server->sockets[fd];
1363 SilcIDListData idata;
1364 SilcCipher cipher = NULL;
1365 SilcHmac hmac = NULL;
1371 SILC_LOG_DEBUG(("Processing packet"));
1373 /* Packet sending */
1375 if (type == SILC_TASK_WRITE) {
1376 /* Do not send data to disconnected connection */
1377 if (SILC_IS_DISCONNECTED(sock))
1380 server->stat.packets_sent++;
1382 if (sock->outbuf->data - sock->outbuf->head)
1383 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1385 /* Send the packet */
1386 ret = silc_packet_send(sock, TRUE);
1388 /* If returned -2 could not write to connection now, will do
1396 /* The packet has been sent and now it is time to set the connection
1397 back to only for input. When there is again some outgoing data
1398 available for this connection it will be set for output as well.
1399 This call clears the output setting and sets it only for input. */
1400 SILC_SET_CONNECTION_FOR_INPUT(fd);
1401 SILC_UNSET_OUTBUF_PENDING(sock);
1403 silc_buffer_clear(sock->outbuf);
1407 /* Packet receiving */
1409 /* Read some data from connection */
1410 ret = silc_packet_receive(sock);
1416 SILC_LOG_DEBUG(("Read EOF"));
1418 /* If connection is disconnecting already we will finally
1419 close the connection */
1420 if (SILC_IS_DISCONNECTING(sock)) {
1421 if (sock->user_data)
1422 silc_server_free_sock_user_data(server, sock);
1423 silc_server_close_connection(server, sock);
1427 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1428 SILC_SET_DISCONNECTING(sock);
1430 /* If the closed connection was our primary router connection the
1431 start re-connecting phase. */
1432 if (!server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER &&
1433 sock == server->router->connection)
1434 silc_task_register(server->timeout_queue, 0,
1435 silc_server_connect_to_router,
1438 SILC_TASK_PRI_NORMAL);
1440 if (sock->user_data)
1441 silc_server_free_sock_user_data(server, sock);
1442 silc_server_close_connection(server, sock);
1446 /* If connection is disconnecting or disconnected we will ignore
1448 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1449 SILC_LOG_DEBUG(("Ignoring read data from disonnected connection"));
1453 server->stat.packets_received++;
1455 /* Get keys and stuff from ID entry */
1456 idata = (SilcIDListData)sock->user_data;
1458 idata->last_receive = time(NULL);
1459 cipher = idata->receive_key;
1460 hmac = idata->hmac_receive;
1463 /* Process the packet. This will call the parser that will then
1464 decrypt and parse the packet. */
1465 silc_packet_receive_process(sock, cipher, hmac, silc_server_packet_parse,
1469 /* Callback function that the silc_packet_decrypt will call to make the
1470 decision whether the packet is normal or special packet. We will
1471 return TRUE if it is normal and FALSE if it is special */
1473 static int silc_server_packet_decrypt_check(SilcPacketType packet_type,
1475 SilcPacketContext *packet,
1478 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1479 SilcServer server = (SilcServer)parse_ctx->context;
1481 /* Packet is normal packet, if:
1483 1) packet is private message packet and does not have private key set
1484 2) is other packet than channel message packet
1485 3) is channel message packet and remote is router and we are router
1487 all other packets are special packets
1490 if (packet_type == SILC_PACKET_PRIVATE_MESSAGE &&
1491 (buffer->data[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
1494 if (packet_type != SILC_PACKET_CHANNEL_MESSAGE ||
1495 (packet_type == SILC_PACKET_CHANNEL_MESSAGE &&
1496 parse_ctx->sock->type == SILC_SOCKET_TYPE_ROUTER &&
1497 server->server_type == SILC_ROUTER))
1503 /* Parses whole packet, received earlier. */
1505 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1507 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1508 SilcServer server = (SilcServer)parse_ctx->context;
1509 SilcSocketConnection sock = parse_ctx->sock;
1510 SilcPacketContext *packet = parse_ctx->packet;
1511 SilcIDListData idata = (SilcIDListData)sock->user_data;
1514 SILC_LOG_DEBUG(("Start"));
1516 /* Decrypt the received packet */
1517 ret = silc_packet_decrypt(idata ? idata->receive_key : NULL,
1518 idata ? idata->hmac_receive : NULL,
1519 packet->buffer, packet,
1520 silc_server_packet_decrypt_check, parse_ctx);
1525 /* Parse the packet. Packet type is returned. */
1526 ret = silc_packet_parse(packet);
1528 /* Parse the packet header in special way as this is "special"
1530 ret = silc_packet_parse_special(packet);
1533 if (ret == SILC_PACKET_NONE)
1536 /* Check that the the current client ID is same as in the client's packet. */
1537 if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
1538 SilcClientEntry client = (SilcClientEntry)sock->user_data;
1539 if (client && client->id) {
1540 void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
1541 packet->src_id_type);
1542 if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
1550 if (server->server_type == SILC_ROUTER) {
1551 /* Route the packet if it is not destined to us. Other ID types but
1552 server are handled separately after processing them. */
1553 if (!(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
1554 packet->dst_id_type == SILC_ID_SERVER &&
1555 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1556 memcmp(packet->dst_id, server->id_string, packet->dst_id_len)) {
1558 /* Route the packet to fastest route for the destination ID */
1559 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
1560 packet->dst_id_type);
1563 silc_server_packet_route(server,
1564 silc_server_route_get(server, id,
1565 packet->dst_id_type),
1572 /* Parse the incoming packet type */
1573 silc_server_packet_parse_type(server, sock, packet);
1575 if (server->server_type == SILC_ROUTER) {
1576 /* Broadcast packet if it is marked as broadcast packet and it is
1577 originated from router and we are router. */
1578 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1579 packet->flags & SILC_PACKET_FLAG_BROADCAST &&
1580 !server->standalone) {
1581 silc_server_packet_broadcast(server, server->router->connection, packet);
1586 /* silc_buffer_clear(sock->inbuf); */
1587 silc_packet_context_free(packet);
1588 silc_free(parse_ctx);
1591 /* Parser callback called by silc_packet_receive_process. This merely
1592 registers timeout that will handle the actual parsing when appropriate. */
1594 void silc_server_packet_parse(SilcPacketParserContext *parser_context)
1596 SilcServer server = (SilcServer)parser_context->context;
1597 SilcSocketConnection sock = parser_context->sock;
1599 switch (sock->type) {
1600 case SILC_SOCKET_TYPE_UNKNOWN:
1601 case SILC_SOCKET_TYPE_CLIENT:
1602 /* Parse the packet with timeout */
1603 silc_task_register(server->timeout_queue, sock->sock,
1604 silc_server_packet_parse_real,
1605 (void *)parser_context, 0, 100000,
1607 SILC_TASK_PRI_NORMAL);
1609 case SILC_SOCKET_TYPE_SERVER:
1610 case SILC_SOCKET_TYPE_ROUTER:
1611 /* Packets from servers are parsed as soon as possible */
1612 silc_task_register(server->timeout_queue, sock->sock,
1613 silc_server_packet_parse_real,
1614 (void *)parser_context, 0, 1,
1616 SILC_TASK_PRI_NORMAL);
1623 /* Parses the packet type and calls what ever routines the packet type
1624 requires. This is done for all incoming packets. */
1626 void silc_server_packet_parse_type(SilcServer server,
1627 SilcSocketConnection sock,
1628 SilcPacketContext *packet)
1630 SilcPacketType type = packet->type;
1632 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1634 /* Parse the packet type */
1636 case SILC_PACKET_DISCONNECT:
1637 SILC_LOG_DEBUG(("Disconnect packet"));
1638 if (packet->flags & SILC_PACKET_FLAG_LIST)
1642 case SILC_PACKET_SUCCESS:
1644 * Success received for something. For now we can have only
1645 * one protocol for connection executing at once hence this
1646 * success message is for whatever protocol is executing currently.
1648 SILC_LOG_DEBUG(("Success packet"));
1649 if (packet->flags & SILC_PACKET_FLAG_LIST)
1651 if (sock->protocol) {
1652 sock->protocol->execute(server->timeout_queue, 0,
1653 sock->protocol, sock->sock, 0, 0);
1657 case SILC_PACKET_FAILURE:
1659 * Failure received for something. For now we can have only
1660 * one protocol for connection executing at once hence this
1661 * failure message is for whatever protocol is executing currently.
1663 SILC_LOG_DEBUG(("Failure packet"));
1664 if (packet->flags & SILC_PACKET_FLAG_LIST)
1666 if (sock->protocol) {
1667 SilcServerFailureContext f;
1668 f = silc_calloc(1, sizeof(*f));
1672 /* We will wait 5 seconds to process this failure packet */
1673 silc_task_register(server->timeout_queue, sock->sock,
1674 silc_server_failure_callback, (void *)f, 5, 0,
1675 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1679 case SILC_PACKET_REJECT:
1680 SILC_LOG_DEBUG(("Reject packet"));
1681 if (packet->flags & SILC_PACKET_FLAG_LIST)
1686 case SILC_PACKET_NOTIFY:
1688 * Received notify packet. Server can receive notify packets from
1689 * router. Server then relays the notify messages to clients if needed.
1691 SILC_LOG_DEBUG(("Notify packet"));
1692 if (packet->flags & SILC_PACKET_FLAG_LIST)
1693 silc_server_notify_list(server, sock, packet);
1695 silc_server_notify(server, sock, packet);
1701 case SILC_PACKET_CHANNEL_MESSAGE:
1703 * Received channel message. Channel messages are special packets
1704 * (although probably most common ones) thus they are handled
1707 SILC_LOG_DEBUG(("Channel Message packet"));
1708 if (packet->flags & SILC_PACKET_FLAG_LIST)
1710 silc_server_channel_message(server, sock, packet);
1713 case SILC_PACKET_CHANNEL_KEY:
1715 * Received key for channel. As channels are created by the router
1716 * the keys are as well. We will distribute the key to all of our
1717 * locally connected clients on the particular channel. Router
1718 * never receives this channel and thus is ignored.
1720 SILC_LOG_DEBUG(("Channel Key packet"));
1721 if (packet->flags & SILC_PACKET_FLAG_LIST)
1723 silc_server_channel_key(server, sock, packet);
1729 case SILC_PACKET_COMMAND:
1731 * Recived command. Processes the command request and allocates the
1732 * command context and calls the command.
1734 SILC_LOG_DEBUG(("Command packet"));
1735 if (packet->flags & SILC_PACKET_FLAG_LIST)
1737 silc_server_command_process(server, sock, packet);
1740 case SILC_PACKET_COMMAND_REPLY:
1742 * Received command reply packet. Received command reply to command. It
1743 * may be reply to command sent by us or reply to command sent by client
1744 * that we've routed further.
1746 SILC_LOG_DEBUG(("Command Reply packet"));
1747 if (packet->flags & SILC_PACKET_FLAG_LIST)
1749 silc_server_command_reply(server, sock, packet);
1753 * Private Message packets
1755 case SILC_PACKET_PRIVATE_MESSAGE:
1757 * Received private message packet. The packet is coming from either
1760 SILC_LOG_DEBUG(("Private Message packet"));
1761 if (packet->flags & SILC_PACKET_FLAG_LIST)
1763 silc_server_private_message(server, sock, packet);
1766 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1768 * Private message key packet.
1770 if (packet->flags & SILC_PACKET_FLAG_LIST)
1772 silc_server_private_message_key(server, sock, packet);
1776 * Key Exchange protocol packets
1778 case SILC_PACKET_KEY_EXCHANGE:
1779 SILC_LOG_DEBUG(("KE packet"));
1780 if (packet->flags & SILC_PACKET_FLAG_LIST)
1783 if (sock->protocol && sock->protocol->protocol &&
1784 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1786 SilcServerKEInternalContext *proto_ctx =
1787 (SilcServerKEInternalContext *)sock->protocol->context;
1789 proto_ctx->packet = silc_packet_context_dup(packet);
1791 /* Let the protocol handle the packet */
1792 sock->protocol->execute(server->timeout_queue, 0,
1793 sock->protocol, sock->sock, 0, 100000);
1795 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1796 "protocol active, packet dropped."));
1798 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1802 case SILC_PACKET_KEY_EXCHANGE_1:
1803 SILC_LOG_DEBUG(("KE 1 packet"));
1804 if (packet->flags & SILC_PACKET_FLAG_LIST)
1807 if (sock->protocol && sock->protocol->protocol &&
1808 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1809 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1811 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1812 SilcServerRekeyInternalContext *proto_ctx =
1813 (SilcServerRekeyInternalContext *)sock->protocol->context;
1815 if (proto_ctx->packet)
1816 silc_packet_context_free(proto_ctx->packet);
1818 proto_ctx->packet = silc_packet_context_dup(packet);
1820 /* Let the protocol handle the packet */
1821 sock->protocol->execute(server->timeout_queue, 0,
1822 sock->protocol, sock->sock, 0, 0);
1824 SilcServerKEInternalContext *proto_ctx =
1825 (SilcServerKEInternalContext *)sock->protocol->context;
1827 if (proto_ctx->packet)
1828 silc_packet_context_free(proto_ctx->packet);
1830 proto_ctx->packet = silc_packet_context_dup(packet);
1831 proto_ctx->dest_id_type = packet->src_id_type;
1832 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1833 packet->src_id_type);
1834 if (!proto_ctx->dest_id)
1837 /* Let the protocol handle the packet */
1838 sock->protocol->execute(server->timeout_queue, 0,
1839 sock->protocol, sock->sock,
1843 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1844 "protocol active, packet dropped."));
1848 case SILC_PACKET_KEY_EXCHANGE_2:
1849 SILC_LOG_DEBUG(("KE 2 packet"));
1850 if (packet->flags & SILC_PACKET_FLAG_LIST)
1853 if (sock->protocol && sock->protocol->protocol &&
1854 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1855 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1857 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1858 SilcServerRekeyInternalContext *proto_ctx =
1859 (SilcServerRekeyInternalContext *)sock->protocol->context;
1861 if (proto_ctx->packet)
1862 silc_packet_context_free(proto_ctx->packet);
1864 proto_ctx->packet = silc_packet_context_dup(packet);
1866 /* Let the protocol handle the packet */
1867 sock->protocol->execute(server->timeout_queue, 0,
1868 sock->protocol, sock->sock, 0, 0);
1870 SilcServerKEInternalContext *proto_ctx =
1871 (SilcServerKEInternalContext *)sock->protocol->context;
1873 if (proto_ctx->packet)
1874 silc_packet_context_free(proto_ctx->packet);
1876 proto_ctx->packet = silc_packet_context_dup(packet);
1877 proto_ctx->dest_id_type = packet->src_id_type;
1878 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1879 packet->src_id_type);
1880 if (!proto_ctx->dest_id)
1883 /* Let the protocol handle the packet */
1884 sock->protocol->execute(server->timeout_queue, 0,
1885 sock->protocol, sock->sock,
1889 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
1890 "protocol active, packet dropped."));
1894 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
1896 * Connection authentication request packet. When we receive this packet
1897 * we will send to the other end information about our mandatory
1898 * authentication method for the connection. This packet maybe received
1901 SILC_LOG_DEBUG(("Connection authentication request packet"));
1902 if (packet->flags & SILC_PACKET_FLAG_LIST)
1904 silc_server_connection_auth_request(server, sock, packet);
1908 * Connection Authentication protocol packets
1910 case SILC_PACKET_CONNECTION_AUTH:
1911 /* Start of the authentication protocol. We receive here the
1912 authentication data and will verify it. */
1913 SILC_LOG_DEBUG(("Connection auth packet"));
1914 if (packet->flags & SILC_PACKET_FLAG_LIST)
1917 if (sock->protocol && sock->protocol->protocol->type
1918 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
1920 SilcServerConnAuthInternalContext *proto_ctx =
1921 (SilcServerConnAuthInternalContext *)sock->protocol->context;
1923 proto_ctx->packet = silc_packet_context_dup(packet);
1925 /* Let the protocol handle the packet */
1926 sock->protocol->execute(server->timeout_queue, 0,
1927 sock->protocol, sock->sock, 0, 0);
1929 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1930 "protocol active, packet dropped."));
1934 case SILC_PACKET_NEW_ID:
1936 * Received New ID packet. This includes some new ID that has been
1937 * created. It may be for client, server or channel. This is the way
1938 * to distribute information about new registered entities in the
1941 SILC_LOG_DEBUG(("New ID packet"));
1942 if (packet->flags & SILC_PACKET_FLAG_LIST)
1943 silc_server_new_id_list(server, sock, packet);
1945 silc_server_new_id(server, sock, packet);
1948 case SILC_PACKET_NEW_CLIENT:
1950 * Received new client packet. This includes client information that
1951 * we will use to create initial client ID. After creating new
1952 * ID we will send it to the client.
1954 SILC_LOG_DEBUG(("New Client packet"));
1955 if (packet->flags & SILC_PACKET_FLAG_LIST)
1957 silc_server_new_client(server, sock, packet);
1960 case SILC_PACKET_NEW_SERVER:
1962 * Received new server packet. This includes Server ID and some other
1963 * information that we may save. This is received after server has
1966 SILC_LOG_DEBUG(("New Server packet"));
1967 if (packet->flags & SILC_PACKET_FLAG_LIST)
1969 silc_server_new_server(server, sock, packet);
1972 case SILC_PACKET_NEW_CHANNEL:
1974 * Received new channel packet. Information about new channel in the
1975 * network are distributed using this packet.
1977 SILC_LOG_DEBUG(("New Channel packet"));
1978 if (packet->flags & SILC_PACKET_FLAG_LIST)
1979 silc_server_new_channel_list(server, sock, packet);
1981 silc_server_new_channel(server, sock, packet);
1984 case SILC_PACKET_HEARTBEAT:
1986 * Received heartbeat.
1988 SILC_LOG_DEBUG(("Heartbeat packet"));
1989 if (packet->flags & SILC_PACKET_FLAG_LIST)
1993 case SILC_PACKET_KEY_AGREEMENT:
1995 * Received heartbeat.
1997 SILC_LOG_DEBUG(("Key agreement packet"));
1998 if (packet->flags & SILC_PACKET_FLAG_LIST)
2000 silc_server_key_agreement(server, sock, packet);
2003 case SILC_PACKET_REKEY:
2005 * Received re-key packet. The sender wants to regenerate the session
2008 SILC_LOG_DEBUG(("Re-key packet"));
2009 if (packet->flags & SILC_PACKET_FLAG_LIST)
2011 silc_server_rekey(server, sock, packet);
2014 case SILC_PACKET_REKEY_DONE:
2016 * The re-key is done.
2018 SILC_LOG_DEBUG(("Re-key done packet"));
2019 if (packet->flags & SILC_PACKET_FLAG_LIST)
2022 if (sock->protocol && sock->protocol->protocol &&
2023 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2025 SilcServerRekeyInternalContext *proto_ctx =
2026 (SilcServerRekeyInternalContext *)sock->protocol->context;
2028 if (proto_ctx->packet)
2029 silc_packet_context_free(proto_ctx->packet);
2031 proto_ctx->packet = silc_packet_context_dup(packet);
2033 /* Let the protocol handle the packet */
2034 sock->protocol->execute(server->timeout_queue, 0,
2035 sock->protocol, sock->sock, 0, 0);
2037 SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2038 "protocol active, packet dropped."));
2043 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2049 /* Creates connection to a remote router. */
2051 void silc_server_create_connection(SilcServer server,
2052 char *remote_host, uint32 port)
2054 SilcServerConnection sconn;
2056 /* Allocate connection object for hold connection specific stuff. */
2057 sconn = silc_calloc(1, sizeof(*sconn));
2058 sconn->server = server;
2059 sconn->remote_host = strdup(remote_host);
2060 sconn->remote_port = port;
2062 silc_task_register(server->timeout_queue, 0,
2063 silc_server_connect_router,
2064 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2065 SILC_TASK_PRI_NORMAL);
2068 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2070 silc_socket_free((SilcSocketConnection)context);
2073 /* Closes connection to socket connection */
2075 void silc_server_close_connection(SilcServer server,
2076 SilcSocketConnection sock)
2078 SILC_LOG_INFO(("Closing connection %s:%d [%s] (%d)", sock->hostname,
2080 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2081 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2082 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2083 "Router"), sock->sock));
2085 /* We won't listen for this connection anymore */
2086 silc_schedule_unset_listen_fd(sock->sock);
2088 /* Unregister all tasks */
2089 silc_task_unregister_by_fd(server->io_queue, sock->sock);
2090 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
2092 /* Close the actual connection */
2093 silc_net_close_connection(sock->sock);
2094 server->sockets[sock->sock] = NULL;
2096 silc_task_register(server->timeout_queue, 0,
2097 silc_server_close_connection_final,
2098 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2099 SILC_TASK_PRI_NORMAL);
2102 /* Sends disconnect message to remote connection and disconnects the
2105 void silc_server_disconnect_remote(SilcServer server,
2106 SilcSocketConnection sock,
2107 const char *fmt, ...)
2110 unsigned char buf[4096];
2115 memset(buf, 0, sizeof(buf));
2117 vsprintf(buf, fmt, ap);
2120 SILC_LOG_DEBUG(("Disconnecting remote host"));
2122 SILC_LOG_INFO(("Disconnecting %s:%d [%s]", sock->hostname,
2124 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2125 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2126 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2129 /* Notify remote end that the conversation is over. The notify message
2130 is tried to be sent immediately. */
2131 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
2132 buf, strlen(buf), TRUE);
2134 /* Mark the connection to be disconnected */
2135 SILC_SET_DISCONNECTED(sock);
2136 silc_server_close_connection(server, sock);
2141 SilcClientEntry client;
2142 } *FreeClientInternal;
2144 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2146 FreeClientInternal i = (FreeClientInternal)context;
2148 silc_idlist_del_data(i->client);
2149 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2153 /* Frees client data and notifies about client's signoff. */
2155 void silc_server_free_client_data(SilcServer server,
2156 SilcSocketConnection sock,
2157 SilcClientEntry client,
2161 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2163 /* If there is pending outgoing data for the client then purge it
2164 to the network before removing the client entry. */
2165 if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
2166 (SILC_IS_DISCONNECTED(sock) == FALSE)) {
2167 server->stat.packets_sent++;
2169 if (sock->outbuf->data - sock->outbuf->head)
2170 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
2172 silc_packet_send(sock, TRUE);
2174 SILC_SET_CONNECTION_FOR_INPUT(sock->sock);
2175 SILC_UNSET_OUTBUF_PENDING(sock);
2176 silc_buffer_clear(sock->outbuf);
2179 /* Send SIGNOFF notify to routers. */
2180 if (notify && !server->standalone && server->router)
2181 silc_server_send_notify_signoff(server, server->router->connection,
2182 server->server_type == SILC_SERVER ?
2183 FALSE : TRUE, client->id, signoff);
2185 /* Remove client from all channels */
2187 silc_server_remove_from_channels(server, NULL, client,
2188 TRUE, signoff, TRUE);
2190 silc_server_remove_from_channels(server, NULL, client,
2191 FALSE, NULL, FALSE);
2193 /* We will not delete the client entry right away. We will take it
2194 into history (for WHOWAS command) for 5 minutes */
2197 silc_task_register(server->timeout_queue, 0,
2198 silc_server_free_client_data_timeout,
2200 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2201 client->data.registered = FALSE;
2203 /* Free the client entry and everything in it */
2204 server->stat.my_clients--;
2205 server->stat.clients--;
2206 if (server->server_type == SILC_ROUTER)
2207 server->stat.cell_clients--;
2210 /* Frees user_data pointer from socket connection object. This also sends
2211 appropriate notify packets to the network to inform about leaving
2214 void silc_server_free_sock_user_data(SilcServer server,
2215 SilcSocketConnection sock)
2217 SILC_LOG_DEBUG(("Start"));
2219 switch(sock->type) {
2220 case SILC_SOCKET_TYPE_CLIENT:
2222 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2223 silc_server_free_client_data(server, sock, user_data, TRUE, NULL);
2226 case SILC_SOCKET_TYPE_SERVER:
2227 case SILC_SOCKET_TYPE_ROUTER:
2229 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2231 /* Free all client entries that this server owns as they will
2232 become invalid now as well. */
2234 silc_server_remove_clients_by_server(server, user_data, TRUE);
2236 /* If this was our primary router connection then we're lost to
2237 the outside world. */
2238 if (server->router == user_data) {
2239 server->id_entry->router = NULL;
2240 server->router = NULL;
2241 server->standalone = TRUE;
2244 /* Free the server entry */
2245 silc_idlist_del_data(user_data);
2246 silc_idlist_del_server(server->local_list, user_data);
2247 server->stat.my_servers--;
2248 server->stat.servers--;
2249 if (server->server_type == SILC_ROUTER)
2250 server->stat.cell_servers--;
2255 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2257 silc_idlist_del_data(user_data);
2258 silc_free(user_data);
2263 sock->user_data = NULL;
2266 /* This function is used to remove all client entries by the server `entry'.
2267 This is called when the connection is lost to the server. In this case
2268 we must invalidate all the client entries owned by the server `entry'.
2269 If the `server_signoff' is TRUE then the SERVER_SIGNOFF notify is
2270 distributed to our local clients. */
2272 int silc_server_remove_clients_by_server(SilcServer server,
2273 SilcServerEntry entry,
2276 SilcIDCacheList list = NULL;
2277 SilcIDCacheEntry id_cache = NULL;
2278 SilcClientEntry client = NULL;
2280 SilcClientEntry *clients = NULL;
2281 uint32 clients_c = 0;
2282 unsigned char **argv = NULL;
2283 uint32 *argv_lens = NULL, *argv_types = NULL, argc = 0;
2286 SILC_LOG_DEBUG(("Start"));
2288 if (server_signoff) {
2289 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2290 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2291 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) * (argc + 1));
2292 argv_types = silc_realloc(argv_types, sizeof(*argv_types) * (argc + 1));
2293 argv[argc] = idp->data;
2294 argv_lens[argc] = idp->len;
2295 argv_types[argc] = argc + 1;
2297 silc_buffer_free(idp);
2300 if (silc_idcache_find_by_id(server->local_list->clients,
2301 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2303 if (silc_idcache_list_first(list, &id_cache)) {
2305 client = (SilcClientEntry)id_cache->context;
2306 if (client->data.registered == FALSE) {
2307 if (!silc_idcache_list_next(list, &id_cache))
2313 if (client->router != entry) {
2314 if (server_signoff && client->connection) {
2315 clients = silc_realloc(clients,
2316 sizeof(*clients) * (clients_c + 1));
2317 clients[clients_c] = client;
2321 if (!silc_idcache_list_next(list, &id_cache))
2327 if (server_signoff) {
2328 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2329 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2330 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2332 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2334 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2335 memcpy(argv[argc], idp->data, idp->len);
2336 argv_lens[argc] = idp->len;
2337 argv_types[argc] = argc + 1;
2339 silc_buffer_free(idp);
2342 /* Remove the client entry */
2343 silc_server_remove_from_channels(server, NULL, client, FALSE,
2345 silc_idlist_del_client(server->local_list, client);
2347 if (!silc_idcache_list_next(list, &id_cache))
2351 silc_idcache_list_free(list);
2354 if (silc_idcache_find_by_id(server->global_list->clients,
2355 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2357 if (silc_idcache_list_first(list, &id_cache)) {
2359 client = (SilcClientEntry)id_cache->context;
2360 if (client->data.registered == FALSE) {
2361 if (!silc_idcache_list_next(list, &id_cache))
2367 if (client->router != entry) {
2368 if (server_signoff && client->connection) {
2369 clients = silc_realloc(clients,
2370 sizeof(*clients) * (clients_c + 1));
2371 clients[clients_c] = client;
2375 if (!silc_idcache_list_next(list, &id_cache))
2381 if (server_signoff) {
2382 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2383 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2384 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2386 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2388 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2389 memcpy(argv[argc], idp->data, idp->len);
2390 argv_lens[argc] = idp->len;
2391 argv_types[argc] = argc + 1;
2393 silc_buffer_free(idp);
2396 /* Remove the client entry */
2397 silc_server_remove_from_channels(server, NULL, client, FALSE,
2399 silc_idlist_del_client(server->global_list, client);
2401 if (!silc_idcache_list_next(list, &id_cache))
2405 silc_idcache_list_free(list);
2408 /* Send the SERVER_SIGNOFF notify */
2409 if (server_signoff) {
2412 /* Send SERVER_SIGNOFF notify to our primary router */
2413 if (!server->standalone && server->router) {
2414 args = silc_argument_payload_encode(1, argv, argv_lens,
2416 silc_server_send_notify_args(server,
2417 server->router->connection,
2418 server->server_type == SILC_SERVER ?
2420 SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2422 silc_buffer_free(args);
2425 args = silc_argument_payload_encode(argc, argv, argv_lens,
2427 /* Send to local clients */
2428 for (i = 0; i < clients_c; i++) {
2429 silc_server_send_notify_args(server, clients[i]->connection,
2430 FALSE, SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2435 silc_buffer_free(args);
2437 silc_free(argv_lens);
2438 silc_free(argv_types);
2444 /* Checks whether given channel has global users. If it does this returns
2445 TRUE and FALSE if there is only locally connected clients on the channel. */
2447 int silc_server_channel_has_global(SilcChannelEntry channel)
2449 SilcChannelClientEntry chl;
2451 silc_list_start(channel->user_list);
2452 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2453 if (chl->client->router)
2460 /* Checks whether given channel has locally connected users. If it does this
2461 returns TRUE and FALSE if there is not one locally connected client. */
2463 int silc_server_channel_has_local(SilcChannelEntry channel)
2465 SilcChannelClientEntry chl;
2467 silc_list_start(channel->user_list);
2468 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2469 if (!chl->client->router)
2476 /* Removes client from all channels it has joined. This is used when client
2477 connection is disconnected. If the client on a channel is last, the
2478 channel is removed as well. This sends the SIGNOFF notify types. */
2480 void silc_server_remove_from_channels(SilcServer server,
2481 SilcSocketConnection sock,
2482 SilcClientEntry client,
2484 char *signoff_message,
2487 SilcChannelEntry channel;
2488 SilcChannelClientEntry chl;
2491 SILC_LOG_DEBUG(("Start"));
2493 if (!client || !client->id)
2496 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2498 /* Remove the client from all channels. The client is removed from
2499 the channels' user list. */
2500 silc_list_start(client->channels);
2501 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2502 channel = chl->channel;
2504 /* Remove channel from client's channel list */
2505 silc_list_del(client->channels, chl);
2507 /* Remove channel if there is no users anymore */
2508 if (server->server_type == SILC_ROUTER &&
2509 silc_list_count(channel->user_list) < 2) {
2510 server->stat.my_channels--;
2513 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2515 if (channel->founder_key) {
2516 /* The founder auth data exists, do not remove the channel entry */
2517 SilcChannelClientEntry chl2;
2521 silc_list_start(channel->user_list);
2522 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2523 silc_list_del(chl2->client->channels, chl2);
2524 silc_list_del(channel->user_list, chl2);
2530 if (!silc_idlist_del_channel(server->local_list, channel))
2531 silc_idlist_del_channel(server->global_list, channel);
2535 /* Remove client from channel's client list */
2536 silc_list_del(channel->user_list, chl);
2538 server->stat.my_chanclients--;
2540 /* If there is no global users on the channel anymore mark the channel
2541 as local channel. */
2542 if (server->server_type == SILC_SERVER &&
2543 !silc_server_channel_has_global(channel))
2544 channel->global_users = FALSE;
2546 /* If there is not at least one local user on the channel then we don't
2547 need the channel entry anymore, we can remove it safely. */
2548 if (server->server_type == SILC_SERVER &&
2549 !silc_server_channel_has_local(channel)) {
2550 /* Notify about leaving client if this channel has global users. */
2551 if (notify && channel->global_users)
2552 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2553 SILC_NOTIFY_TYPE_SIGNOFF,
2554 signoff_message ? 2 : 1,
2555 clidp->data, clidp->len,
2556 signoff_message, signoff_message ?
2557 strlen(signoff_message) : 0);
2560 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2562 if (channel->founder_key) {
2563 /* The founder auth data exists, do not remove the channel entry */
2564 SilcChannelClientEntry chl2;
2568 silc_list_start(channel->user_list);
2569 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2570 silc_list_del(chl2->client->channels, chl2);
2571 silc_list_del(channel->user_list, chl2);
2577 if (!silc_idlist_del_channel(server->local_list, channel))
2578 silc_idlist_del_channel(server->global_list, channel);
2579 server->stat.my_channels--;
2583 /* Send notify to channel about client leaving SILC and thus
2584 the entire channel. */
2586 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2587 SILC_NOTIFY_TYPE_SIGNOFF,
2588 signoff_message ? 2 : 1,
2589 clidp->data, clidp->len,
2590 signoff_message, signoff_message ?
2591 strlen(signoff_message) : 0);
2593 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2594 /* Re-generate channel key */
2595 silc_server_create_channel_key(server, channel, 0);
2597 /* Send the channel key to the channel. The key of course is not sent
2598 to the client who was removed from the channel. */
2599 silc_server_send_channel_key(server, client->connection, channel,
2600 server->server_type == SILC_ROUTER ?
2601 FALSE : !server->standalone);
2605 silc_buffer_free(clidp);
2608 /* Removes client from one channel. This is used for example when client
2609 calls LEAVE command to remove itself from the channel. Returns TRUE
2610 if channel still exists and FALSE if the channel is removed when
2611 last client leaves the channel. If `notify' is FALSE notify messages
2614 int silc_server_remove_from_one_channel(SilcServer server,
2615 SilcSocketConnection sock,
2616 SilcChannelEntry channel,
2617 SilcClientEntry client,
2620 SilcChannelEntry ch;
2621 SilcChannelClientEntry chl;
2624 SILC_LOG_DEBUG(("Start"));
2626 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2628 /* Remove the client from the channel. The client is removed from
2629 the channel's user list. */
2630 silc_list_start(client->channels);
2631 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2632 if (chl->channel != channel)
2637 /* Remove channel from client's channel list */
2638 silc_list_del(client->channels, chl);
2640 /* Remove channel if there is no users anymore */
2641 if (server->server_type == SILC_ROUTER &&
2642 silc_list_count(channel->user_list) < 2) {
2644 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2645 if (!silc_idlist_del_channel(server->local_list, channel))
2646 silc_idlist_del_channel(server->global_list, channel);
2647 silc_buffer_free(clidp);
2648 server->stat.my_channels--;
2652 /* Remove client from channel's client list */
2653 silc_list_del(channel->user_list, chl);
2655 server->stat.my_chanclients--;
2657 /* If there is no global users on the channel anymore mark the channel
2658 as local channel. */
2659 if (server->server_type == SILC_SERVER &&
2660 !silc_server_channel_has_global(channel))
2661 channel->global_users = FALSE;
2663 /* If there is not at least one local user on the channel then we don't
2664 need the channel entry anymore, we can remove it safely. */
2665 if (server->server_type == SILC_SERVER &&
2666 !silc_server_channel_has_local(channel)) {
2667 /* Notify about leaving client if this channel has global users. */
2668 if (notify && channel->global_users)
2669 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2670 SILC_NOTIFY_TYPE_LEAVE, 1,
2671 clidp->data, clidp->len);
2673 silc_buffer_free(clidp);
2676 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2678 if (channel->founder_key) {
2679 /* The founder auth data exists, do not remove the channel entry */
2680 SilcChannelClientEntry chl2;
2684 silc_list_start(channel->user_list);
2685 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2686 silc_list_del(chl2->client->channels, chl2);
2687 silc_list_del(channel->user_list, chl2);
2693 if (!silc_idlist_del_channel(server->local_list, channel))
2694 silc_idlist_del_channel(server->global_list, channel);
2695 server->stat.my_channels--;
2699 /* Send notify to channel about client leaving the channel */
2701 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2702 SILC_NOTIFY_TYPE_LEAVE, 1,
2703 clidp->data, clidp->len);
2707 silc_buffer_free(clidp);
2711 /* Returns TRUE if the given client is on the channel. FALSE if not.
2712 This works because we assure that the user list on the channel is
2713 always in up to date thus we can only check the channel list from
2714 `client' which is faster than checking the user list from `channel'. */
2716 int silc_server_client_on_channel(SilcClientEntry client,
2717 SilcChannelEntry channel)
2719 SilcChannelClientEntry chl;
2721 if (!client || !channel)
2724 silc_list_start(client->channels);
2725 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END)
2726 if (chl->channel == channel)
2732 /* Timeout callback. This is called if connection is idle or for some
2733 other reason is not responding within some period of time. This
2734 disconnects the remote end. */
2736 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2738 SilcServer server = (SilcServer)context;
2739 SilcSocketConnection sock = server->sockets[fd];
2744 if (sock->user_data)
2745 silc_server_free_sock_user_data(server, sock);
2747 silc_server_disconnect_remote(server, sock,
2748 "Server closed connection: "
2749 "Connection timeout");
2752 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2753 function may be used only by router. In real SILC network all channels
2754 are created by routers thus this function is never used by normal
2757 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2758 SilcServerID *router_id,
2764 SilcChannelID *channel_id;
2765 SilcChannelEntry entry;
2769 SILC_LOG_DEBUG(("Creating new channel"));
2772 cipher = "aes-256-cbc";
2774 hmac = "hmac-sha1-96";
2776 /* Allocate cipher */
2777 if (!silc_cipher_alloc(cipher, &key))
2781 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2782 silc_cipher_free(key);
2786 channel_name = strdup(channel_name);
2788 /* Create the channel */
2789 silc_id_create_channel_id(router_id, server->rng, &channel_id);
2790 entry = silc_idlist_add_channel(server->local_list, channel_name,
2791 SILC_CHANNEL_MODE_NONE, channel_id,
2792 NULL, key, newhmac);
2794 silc_free(channel_name);
2798 entry->cipher = strdup(cipher);
2799 entry->hmac_name = strdup(hmac);
2801 /* Now create the actual key material */
2802 silc_server_create_channel_key(server, entry,
2803 silc_cipher_get_key_len(key) / 8);
2805 /* Notify other routers about the new channel. We send the packet
2806 to our primary route. */
2807 if (broadcast && server->standalone == FALSE)
2808 silc_server_send_new_channel(server, server->router->connection, TRUE,
2809 channel_name, entry->id,
2810 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
2813 server->stat.my_channels++;
2818 /* Same as above but creates the channel with Channel ID `channel_id. */
2821 silc_server_create_new_channel_with_id(SilcServer server,
2825 SilcChannelID *channel_id,
2828 SilcChannelEntry entry;
2832 SILC_LOG_DEBUG(("Creating new channel"));
2835 cipher = "aes-256-cbc";
2837 hmac = "hmac-sha1-96";
2839 /* Allocate cipher */
2840 if (!silc_cipher_alloc(cipher, &key))
2844 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2845 silc_cipher_free(key);
2849 channel_name = strdup(channel_name);
2851 /* Create the channel */
2852 entry = silc_idlist_add_channel(server->local_list, channel_name,
2853 SILC_CHANNEL_MODE_NONE, channel_id,
2854 NULL, key, newhmac);
2856 silc_free(channel_name);
2860 /* Now create the actual key material */
2861 silc_server_create_channel_key(server, entry,
2862 silc_cipher_get_key_len(key) / 8);
2864 /* Notify other routers about the new channel. We send the packet
2865 to our primary route. */
2866 if (broadcast && server->standalone == FALSE)
2867 silc_server_send_new_channel(server, server->router->connection, TRUE,
2868 channel_name, entry->id,
2869 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
2872 server->stat.my_channels++;
2877 /* Channel's key re-key timeout callback. */
2879 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
2881 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
2882 SilcServer server = (SilcServer)rekey->context;
2884 silc_server_create_channel_key(server, rekey->channel, rekey->key_len);
2885 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
2887 silc_task_register(server->timeout_queue, 0,
2888 silc_server_channel_key_rekey,
2889 (void *)rekey, 3600, 0,
2891 SILC_TASK_PRI_NORMAL);
2894 /* Generates new channel key. This is used to create the initial channel key
2895 but also to re-generate new key for channel. If `key_len' is provided
2896 it is the bytes of the key length. */
2898 void silc_server_create_channel_key(SilcServer server,
2899 SilcChannelEntry channel,
2903 unsigned char channel_key[32], hash[32];
2906 SILC_LOG_DEBUG(("Generating channel key"));
2908 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
2909 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
2913 if (!channel->channel_key)
2914 if (!silc_cipher_alloc("aes-256-cbc", &channel->channel_key))
2919 else if (channel->key_len)
2920 len = channel->key_len / 8;
2922 len = silc_cipher_get_key_len(channel->channel_key) / 8;
2924 /* Create channel key */
2925 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
2928 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
2930 /* Remove old key if exists */
2932 memset(channel->key, 0, channel->key_len / 8);
2933 silc_free(channel->key);
2937 channel->key_len = len * 8;
2938 channel->key = silc_calloc(len, sizeof(*channel->key));
2939 memcpy(channel->key, channel_key, len);
2940 memset(channel_key, 0, sizeof(channel_key));
2942 /* Generate HMAC key from the channel key data and set it */
2944 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2945 silc_hash_make(channel->hmac->hash, channel->key, len, hash);
2946 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2947 memset(hash, 0, sizeof(hash));
2949 if (server->server_type == SILC_ROUTER) {
2950 if (!channel->rekey)
2951 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
2952 channel->rekey->context = (void *)server;
2953 channel->rekey->channel = channel;
2954 channel->rekey->key_len = key_len;
2956 silc_task_unregister_by_callback(server->timeout_queue,
2957 silc_server_channel_key_rekey);
2958 silc_task_register(server->timeout_queue, 0,
2959 silc_server_channel_key_rekey,
2960 (void *)channel->rekey, 3600, 0,
2962 SILC_TASK_PRI_NORMAL);
2966 /* Saves the channel key found in the encoded `key_payload' buffer. This
2967 function is used when we receive Channel Key Payload and also when we're
2968 processing JOIN command reply. Returns entry to the channel. */
2970 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
2971 SilcBuffer key_payload,
2972 SilcChannelEntry channel)
2974 SilcChannelKeyPayload payload = NULL;
2975 SilcChannelID *id = NULL;
2976 unsigned char *tmp, hash[32];
2980 SILC_LOG_DEBUG(("Start"));
2982 /* Decode channel key payload */
2983 payload = silc_channel_key_payload_parse(key_payload);
2985 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
2990 /* Get the channel entry */
2993 /* Get channel ID */
2994 tmp = silc_channel_key_get_id(payload, &tmp_len);
2995 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3001 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3003 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3005 SILC_LOG_ERROR(("Received key for non-existent channel"));
3011 tmp = silc_channel_key_get_key(payload, &tmp_len);
3017 cipher = silc_channel_key_get_cipher(payload, NULL);
3023 /* Remove old key if exists */
3025 memset(channel->key, 0, channel->key_len / 8);
3026 silc_free(channel->key);
3027 silc_cipher_free(channel->channel_key);
3030 /* Create new cipher */
3031 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3036 if (channel->cipher)
3037 silc_free(channel->cipher);
3038 channel->cipher = strdup(cipher);
3041 channel->key_len = tmp_len * 8;
3042 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
3043 memcpy(channel->key, tmp, tmp_len);
3044 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3046 /* Generate HMAC key from the channel key data and set it */
3048 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
3049 silc_hash_make(channel->hmac->hash, tmp, tmp_len, hash);
3050 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
3052 memset(hash, 0, sizeof(hash));
3053 memset(tmp, 0, tmp_len);
3055 if (server->server_type == SILC_ROUTER) {
3056 if (!channel->rekey)
3057 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3058 channel->rekey->context = (void *)server;
3059 channel->rekey->channel = channel;
3061 silc_task_unregister_by_callback(server->timeout_queue,
3062 silc_server_channel_key_rekey);
3063 silc_task_register(server->timeout_queue, 0,
3064 silc_server_channel_key_rekey,
3065 (void *)channel->rekey, 3600, 0,
3067 SILC_TASK_PRI_NORMAL);
3074 silc_channel_key_payload_free(payload);
3079 /* Heartbeat callback. This function is set as argument for the
3080 silc_socket_set_heartbeat function. The library will call this function
3081 at the set time interval. */
3083 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3086 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
3088 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname,
3091 /* Send the heartbeat */
3092 silc_server_send_heartbeat(hb->server, sock);
3095 /* Returns assembled of all servers in the given ID list. The packet's
3096 form is dictated by the New ID payload. */
3098 static void silc_server_announce_get_servers(SilcServer server,
3100 SilcBuffer *servers)
3102 SilcIDCacheList list;
3103 SilcIDCacheEntry id_cache;
3104 SilcServerEntry entry;
3107 /* Go through all clients in the list */
3108 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
3109 SILC_ID_SERVER, &list)) {
3110 if (silc_idcache_list_first(list, &id_cache)) {
3112 entry = (SilcServerEntry)id_cache->context;
3114 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3116 *servers = silc_buffer_realloc(*servers,
3118 (*servers)->truelen + idp->len :
3120 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3121 silc_buffer_put(*servers, idp->data, idp->len);
3122 silc_buffer_pull(*servers, idp->len);
3123 silc_buffer_free(idp);
3125 if (!silc_idcache_list_next(list, &id_cache))
3130 silc_idcache_list_free(list);
3134 /* This function is used by router to announce existing servers to our
3135 primary router when we've connected to it. */
3137 void silc_server_announce_servers(SilcServer server)
3139 SilcBuffer servers = NULL;
3141 SILC_LOG_DEBUG(("Announcing servers"));
3143 /* Get servers in local list */
3144 silc_server_announce_get_servers(server, server->local_list, &servers);
3146 /* Get servers in global list */
3147 silc_server_announce_get_servers(server, server->global_list, &servers);
3150 silc_buffer_push(servers, servers->data - servers->head);
3151 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3153 /* Send the packet */
3154 silc_server_packet_send(server, server->router->connection,
3155 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3156 servers->data, servers->len, TRUE);
3158 silc_buffer_free(servers);
3162 /* Returns assembled packet of all clients in the given ID list. The
3163 packet's form is dictated by the New ID Payload. */
3165 static void silc_server_announce_get_clients(SilcServer server,
3167 SilcBuffer *clients)
3169 SilcIDCacheList list;
3170 SilcIDCacheEntry id_cache;
3171 SilcClientEntry client;
3174 /* Go through all clients in the list */
3175 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
3176 SILC_ID_CLIENT, &list)) {
3177 if (silc_idcache_list_first(list, &id_cache)) {
3179 client = (SilcClientEntry)id_cache->context;
3181 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3183 *clients = silc_buffer_realloc(*clients,
3185 (*clients)->truelen + idp->len :
3187 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3188 silc_buffer_put(*clients, idp->data, idp->len);
3189 silc_buffer_pull(*clients, idp->len);
3190 silc_buffer_free(idp);
3192 if (!silc_idcache_list_next(list, &id_cache))
3197 silc_idcache_list_free(list);
3201 /* This function is used to announce our existing clients to our router
3202 when we've connected to it. */
3204 void silc_server_announce_clients(SilcServer server)
3206 SilcBuffer clients = NULL;
3208 SILC_LOG_DEBUG(("Announcing clients"));
3210 /* Get clients in local list */
3211 silc_server_announce_get_clients(server, server->local_list,
3214 /* As router we announce our global list as well */
3215 if (server->server_type == SILC_ROUTER)
3216 silc_server_announce_get_clients(server, server->global_list,
3220 silc_buffer_push(clients, clients->data - clients->head);
3221 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3223 /* Send the packet */
3224 silc_server_packet_send(server, server->router->connection,
3225 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3226 clients->data, clients->len, TRUE);
3228 silc_buffer_free(clients);
3233 silc_server_announce_encode_notify(SilcNotifyType notify, uint32 argc, ...)
3238 return silc_notify_payload_encode(notify, argc, ap);
3241 /* Returns assembled packets for channel users of the `channel'. */
3243 void silc_server_announce_get_channel_users(SilcServer server,
3244 SilcChannelEntry channel,
3245 SilcBuffer *channel_users,
3246 SilcBuffer *channel_users_modes)
3248 SilcChannelClientEntry chl;
3249 SilcBuffer chidp, clidp;
3252 unsigned char mode[4];
3254 SILC_LOG_DEBUG(("Start"));
3256 /* Now find all users on the channel */
3257 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3258 silc_list_start(channel->user_list);
3259 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
3260 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3263 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
3264 clidp->data, clidp->len,
3265 chidp->data, chidp->len);
3268 silc_buffer_realloc(*channel_users,
3270 (*channel_users)->truelen + len : len));
3271 silc_buffer_pull_tail(*channel_users,
3272 ((*channel_users)->end -
3273 (*channel_users)->data));
3275 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3276 silc_buffer_pull(*channel_users, len);
3277 silc_buffer_free(tmp);
3279 /* CUMODE notify for mode change on the channel */
3280 SILC_PUT32_MSB(chl->mode, mode);
3281 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
3282 3, clidp->data, clidp->len,
3284 clidp->data, clidp->len);
3286 *channel_users_modes =
3287 silc_buffer_realloc(*channel_users_modes,
3288 (*channel_users_modes ?
3289 (*channel_users_modes)->truelen + len : len));
3290 silc_buffer_pull_tail(*channel_users_modes,
3291 ((*channel_users_modes)->end -
3292 (*channel_users_modes)->data));
3294 silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
3295 silc_buffer_pull(*channel_users_modes, len);
3296 silc_buffer_free(tmp);
3298 silc_buffer_free(clidp);
3300 silc_buffer_free(chidp);
3303 /* Returns assembled packets for all channels and users on those channels
3304 from the given ID List. The packets are in the form dictated by the
3305 New Channel and New Channel User payloads. */
3307 void silc_server_announce_get_channels(SilcServer server,
3309 SilcBuffer *channels,
3310 SilcBuffer *channel_users,
3311 SilcBuffer *channel_users_modes)
3313 SilcIDCacheList list;
3314 SilcIDCacheEntry id_cache;
3315 SilcChannelEntry channel;
3321 SILC_LOG_DEBUG(("Start"));
3323 /* Go through all channels in the list */
3324 if (silc_idcache_find_by_id(id_list->channels, SILC_ID_CACHE_ANY,
3325 SILC_ID_CHANNEL, &list)) {
3326 if (silc_idcache_list_first(list, &id_cache)) {
3328 channel = (SilcChannelEntry)id_cache->context;
3330 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3331 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3332 name_len = strlen(channel->channel_name);
3334 len = 4 + name_len + id_len + 4;
3336 silc_buffer_realloc(*channels,
3337 (*channels ? (*channels)->truelen + len : len));
3338 silc_buffer_pull_tail(*channels,
3339 ((*channels)->end - (*channels)->data));
3340 silc_buffer_format(*channels,
3341 SILC_STR_UI_SHORT(name_len),
3342 SILC_STR_UI_XNSTRING(channel->channel_name,
3344 SILC_STR_UI_SHORT(id_len),
3345 SILC_STR_UI_XNSTRING(cid, id_len),
3346 SILC_STR_UI_INT(channel->mode),
3348 silc_buffer_pull(*channels, len);
3350 silc_server_announce_get_channel_users(server, channel,
3352 channel_users_modes);
3356 if (!silc_idcache_list_next(list, &id_cache))
3361 silc_idcache_list_free(list);
3365 /* This function is used to announce our existing channels to our router
3366 when we've connected to it. This also announces the users on the
3367 channels to the router. */
3369 void silc_server_announce_channels(SilcServer server)
3371 SilcBuffer channels = NULL, channel_users = NULL, channel_users_modes = NULL;
3373 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3375 /* Get channels and channel users in local list */
3376 silc_server_announce_get_channels(server, server->local_list,
3377 &channels, &channel_users,
3378 &channel_users_modes);
3380 /* Get channels and channel users in global list */
3381 silc_server_announce_get_channels(server, server->global_list,
3382 &channels, &channel_users,
3383 &channel_users_modes);
3386 silc_buffer_push(channels, channels->data - channels->head);
3387 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3389 /* Send the packet */
3390 silc_server_packet_send(server, server->router->connection,
3391 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3392 channels->data, channels->len,
3395 silc_buffer_free(channels);
3398 if (channel_users) {
3399 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3400 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3401 channel_users->len);
3403 /* Send the packet */
3404 silc_server_packet_send(server, server->router->connection,
3405 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3406 channel_users->data, channel_users->len,
3409 silc_buffer_free(channel_users);
3412 if (channel_users_modes) {
3413 silc_buffer_push(channel_users_modes,
3414 channel_users_modes->data - channel_users_modes->head);
3415 SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes->data,
3416 channel_users_modes->len);
3418 /* Send the packet */
3419 silc_server_packet_send(server, server->router->connection,
3420 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3421 channel_users_modes->data,
3422 channel_users_modes->len,
3425 silc_buffer_free(channel_users_modes);
3429 /* Failure timeout callback. If this is called then we will immediately
3430 process the received failure. We always process the failure with timeout
3431 since we do not want to blindly trust to received failure packets.
3432 This won't be called (the timeout is cancelled) if the failure was
3433 bogus (it is bogus if remote does not close the connection after sending
3436 SILC_TASK_CALLBACK(silc_server_failure_callback)
3438 SilcServerFailureContext f = (SilcServerFailureContext)context;
3440 if (f->sock->protocol) {
3441 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3442 f->sock->protocol->execute(f->server->timeout_queue, 0,
3443 f->sock->protocol, f->sock->sock, 0, 0);
3449 /* Assembles user list and users mode list from the `channel'. */
3451 void silc_server_get_users_on_channel(SilcServer server,
3452 SilcChannelEntry channel,
3453 SilcBuffer *user_list,
3454 SilcBuffer *mode_list,
3457 SilcChannelClientEntry chl;
3458 SilcBuffer client_id_list;
3459 SilcBuffer client_mode_list;
3461 uint32 list_count = 0;
3463 /* XXX rewrite - this does not support IPv6 based Client ID's. */
3465 client_id_list = silc_buffer_alloc((SILC_ID_CLIENT_LEN + 4) *
3466 silc_list_count(channel->user_list));
3467 client_mode_list = silc_buffer_alloc(4 *
3468 silc_list_count(channel->user_list));
3469 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3470 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3471 silc_list_start(channel->user_list);
3472 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
3474 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3475 silc_buffer_put(client_id_list, idp->data, idp->len);
3476 silc_buffer_pull(client_id_list, idp->len);
3477 silc_buffer_free(idp);
3479 /* Client's mode on channel */
3480 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3481 silc_buffer_pull(client_mode_list, 4);
3485 silc_buffer_push(client_id_list,
3486 client_id_list->data - client_id_list->head);
3487 silc_buffer_push(client_mode_list,
3488 client_mode_list->data - client_mode_list->head);
3490 *user_list = client_id_list;
3491 *mode_list = client_mode_list;
3492 *user_count = list_count;
3495 /* Saves users and their modes to the `channel'. */
3497 void silc_server_save_users_on_channel(SilcServer server,
3498 SilcSocketConnection sock,
3499 SilcChannelEntry channel,
3500 SilcClientID *noadd,
3501 SilcBuffer user_list,
3502 SilcBuffer mode_list,
3507 /* Cache the received Client ID's and modes. This cache expires
3508 whenever server sends notify message to channel. It means two things;
3509 some user has joined or leaved the channel. XXX TODO! */
3510 for (i = 0; i < user_count; i++) {
3513 SilcClientID *client_id;
3514 SilcClientEntry client;
3517 SILC_GET16_MSB(idp_len, user_list->data + 2);
3519 client_id = silc_id_payload_parse_id(user_list->data, idp_len);
3520 silc_buffer_pull(user_list, idp_len);
3525 SILC_GET32_MSB(mode, mode_list->data);
3526 silc_buffer_pull(mode_list, 4);
3528 if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3529 silc_free(client_id);
3533 /* Check if we have this client cached already. */
3534 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3537 client = silc_idlist_find_client_by_id(server->global_list,
3540 /* If router did not find such Client ID in its lists then this must
3541 be bogus client or some router in the net is buggy. */
3542 if (server->server_type == SILC_ROUTER) {
3543 silc_free(client_id);
3547 /* We don't have that client anywhere, add it. The client is added
3548 to global list since server didn't have it in the lists so it must be
3550 client = silc_idlist_add_client(server->global_list, NULL, 0, NULL,
3552 silc_id_dup(client_id, SILC_ID_CLIENT),
3553 sock->user_data, NULL);
3555 silc_free(client_id);
3559 client->data.registered = TRUE;
3562 silc_free(client_id);
3564 if (!silc_server_client_on_channel(client, channel)) {
3565 /* Client was not on the channel, add it. */
3566 SilcChannelClientEntry chl = silc_calloc(1, sizeof(*chl));
3567 chl->client = client;
3569 chl->channel = channel;
3570 silc_list_add(channel->user_list, chl);
3571 silc_list_add(client->channels, chl);
3576 /* Lookups route to the client indicated by the `id_data'. The connection
3577 object and internal data object is returned. Returns NULL if route
3578 could not be found to the client. If the `client_id' is specified then
3579 it is used and the `id_data' is ignored. */
3581 SilcSocketConnection silc_server_get_client_route(SilcServer server,
3582 unsigned char *id_data,
3584 SilcClientID *client_id,
3585 SilcIDListData *idata)
3588 SilcClientEntry client;
3590 SILC_LOG_DEBUG(("Start"));
3592 /* Decode destination Client ID */
3594 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
3596 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
3600 id = silc_id_dup(client_id, SILC_ID_CLIENT);
3603 /* If the destination belongs to our server we don't have to route
3604 the packet anywhere but to send it to the local destination. */
3605 client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
3609 if (client && client->data.registered == FALSE)
3612 /* If we are router and the client has router then the client is in
3613 our cell but not directly connected to us. */
3614 if (server->server_type == SILC_ROUTER && client->router) {
3615 /* We are of course in this case the client's router thus the real
3616 "router" of the client is the server who owns the client. Thus
3617 we will send the packet to that server. */
3619 *idata = (SilcIDListData)client->router;
3620 return client->router->connection;
3623 /* Seems that client really is directly connected to us */
3625 *idata = (SilcIDListData)client;
3626 return client->connection;
3629 /* Destination belongs to someone not in this server. If we are normal
3630 server our action is to send the packet to our router. */
3631 if (server->server_type == SILC_SERVER && !server->standalone) {
3634 *idata = (SilcIDListData)server->router;
3635 return server->router->connection;
3638 /* We are router and we will perform route lookup for the destination
3639 and send the packet to fastest route. */
3640 if (server->server_type == SILC_ROUTER && !server->standalone) {
3641 /* Check first that the ID is valid */
3642 client = silc_idlist_find_client_by_id(server->global_list, id, NULL);
3644 SilcSocketConnection dst_sock;
3646 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
3650 *idata = (SilcIDListData)dst_sock->user_data;
3659 /* Encodes and returns channel list of channels the `client' has joined.
3660 Secret channels are not put to the list. */
3662 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
3663 SilcClientEntry client)
3665 SilcBuffer buffer = NULL;
3666 SilcChannelEntry channel;
3667 SilcChannelClientEntry chl;
3673 silc_list_start(client->channels);
3674 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
3675 channel = chl->channel;
3677 if (channel->mode & SILC_CHANNEL_MODE_SECRET)
3680 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3681 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3682 name_len = strlen(channel->channel_name);
3684 len = 4 + name_len + id_len + 4;
3685 buffer = silc_buffer_realloc(buffer,
3686 (buffer ? (buffer)->truelen + len : len));
3687 silc_buffer_pull_tail(buffer, ((buffer)->end - (buffer)->data));
3688 silc_buffer_format(buffer,
3689 SILC_STR_UI_SHORT(name_len),
3690 SILC_STR_UI_XNSTRING(channel->channel_name,
3692 SILC_STR_UI_SHORT(id_len),
3693 SILC_STR_UI_XNSTRING(cid, id_len),
3694 SILC_STR_UI_INT(chl->mode), /* Client's mode */
3696 silc_buffer_pull(buffer, len);
3701 silc_buffer_push(buffer, buffer->data - buffer->head);
3706 /* Finds client entry by Client ID and if it is not found then resolves
3707 it using WHOIS command. */
3709 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
3710 SilcClientID *client_id)
3712 SilcClientEntry client;
3714 client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL);
3716 client = silc_idlist_find_client_by_id(server->global_list,
3718 if (!client && server->server_type == SILC_ROUTER)
3722 if (!client && server->standalone)
3725 if (!client || !client->nickname || !client->username) {
3726 SilcBuffer buffer, idp;
3728 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
3729 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
3730 ++server->cmd_ident, 1,
3731 3, idp->data, idp->len);
3732 silc_server_packet_send(server, client ? client->router->connection :
3733 server->router->connection,
3734 SILC_PACKET_COMMAND, 0,
3735 buffer->data, buffer->len, FALSE);
3736 silc_buffer_free(idp);
3737 silc_buffer_free(buffer);
3743 /* A timeout callback for the re-key. We will be the initiator of the
3746 SILC_TASK_CALLBACK(silc_server_rekey_callback)
3748 SilcSocketConnection sock = (SilcSocketConnection)context;
3749 SilcIDListData idata = (SilcIDListData)sock->user_data;
3750 SilcServer server = (SilcServer)idata->rekey->context;
3751 SilcProtocol protocol;
3752 SilcServerRekeyInternalContext *proto_ctx;
3754 SILC_LOG_DEBUG(("Start"));
3756 /* Allocate internal protocol context. This is sent as context
3758 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
3759 proto_ctx->server = (void *)server;
3760 proto_ctx->sock = sock;
3761 proto_ctx->responder = FALSE;
3762 proto_ctx->pfs = idata->rekey->pfs;
3764 /* Perform rekey protocol. Will call the final callback after the
3765 protocol is over. */
3766 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
3767 &protocol, proto_ctx, silc_server_rekey_final);
3768 sock->protocol = protocol;
3770 /* Run the protocol */
3771 protocol->execute(server->timeout_queue, 0, protocol,
3774 /* Re-register re-key timeout */
3775 silc_task_register(server->timeout_queue, sock->sock,
3776 silc_server_rekey_callback,
3777 context, idata->rekey->timeout, 0,
3778 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
3781 /* The final callback for the REKEY protocol. This will actually take the
3782 new key material into use. */
3784 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
3786 SilcProtocol protocol = (SilcProtocol)context;
3787 SilcServerRekeyInternalContext *ctx =
3788 (SilcServerRekeyInternalContext *)protocol->context;
3789 SilcServer server = (SilcServer)ctx->server;
3790 SilcSocketConnection sock = ctx->sock;
3792 SILC_LOG_DEBUG(("Start"));
3794 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
3795 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
3796 /* Error occured during protocol */
3797 silc_protocol_cancel(server->timeout_queue, protocol);
3798 silc_protocol_free(protocol);
3799 sock->protocol = NULL;
3801 silc_packet_context_free(ctx->packet);
3803 silc_ske_free(ctx->ske);
3809 silc_protocol_free(protocol);
3810 sock->protocol = NULL;
3812 silc_packet_context_free(ctx->packet);
3814 silc_ske_free(ctx->ske);