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 if (!silc_server_config_register_ciphers(server->config))
149 silc_cipher_register_default();
150 if (!silc_server_config_register_pkcs(server->config))
151 silc_pkcs_register_default();
152 if (!silc_server_config_register_hashfuncs(server->config))
153 silc_hash_register_default();
154 if (!silc_server_config_register_hmacs(server->config))
155 silc_hmac_register_default();
157 /* Initialize random number generator for the server. */
158 server->rng = silc_rng_alloc();
159 silc_rng_init(server->rng);
160 silc_rng_global_init(server->rng);
162 /* Initialize hash functions for server to use */
163 silc_hash_alloc("md5", &server->md5hash);
164 silc_hash_alloc("sha1", &server->sha1hash);
166 /* Initialize none cipher */
167 silc_cipher_alloc("none", &server->none_cipher);
169 /* Create a listening server. Note that our server can listen on
170 multiple ports. All listeners are created here and now. */
171 /* XXX Still check this whether to use server_info or listen_port. */
173 while(server->config->listen_port) {
176 tmp = silc_net_create_server(server->config->listen_port->port,
177 server->config->listen_port->host);
181 sock = silc_realloc(sock, (sizeof(int *) * (sock_count + 1)));
182 sock[sock_count] = tmp;
183 server->config->listen_port = server->config->listen_port->next;
187 /* Initialize ID caches */
188 server->local_list->clients =
189 silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
190 server->local_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
191 server->local_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
193 /* These are allocated for normal server as well as these hold some
194 global information that the server has fetched from its router. For
195 router these are used as they are supposed to be used on router. */
196 server->global_list->clients =
197 silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
198 server->global_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
199 server->global_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
201 /* Allocate the entire socket list that is used in server. Eventually
202 all connections will have entry in this table (it is a table of
203 pointers to the actual object that is allocated individually
205 server->sockets = silc_calloc(SILC_SERVER_MAX_CONNECTIONS,
206 sizeof(*server->sockets));
208 for (i = 0; i < sock_count; i++) {
209 SilcSocketConnection newsocket = NULL;
211 /* Set socket to non-blocking mode */
212 silc_net_set_socket_nonblock(sock[i]);
213 server->sock = sock[i];
215 /* Create a Server ID for the server. */
216 silc_id_create_server_id(sock[i], server->rng, &id);
222 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
223 server->id_string_len = silc_id_get_len(id, SILC_ID_SERVER);
224 server->id_type = SILC_ID_SERVER;
225 server->server_name = server->config->server_info->server_name;
227 /* Add ourselves to the server list. We don't have a router yet
228 beacuse we haven't established a route yet. It will be done later.
229 For now, NULL is sent as router. This allocates new entry to
232 silc_idlist_add_server(server->local_list,
233 server->config->server_info->server_name,
234 server->server_type, server->id, NULL, NULL);
236 SILC_LOG_ERROR(("Could not add ourselves to cache"));
240 /* Add ourselves also to the socket table. The entry allocated above
241 is sent as argument for fast referencing in the future. */
242 silc_socket_alloc(sock[i], SILC_SOCKET_TYPE_SERVER, id_entry,
245 server->sockets[sock[i]] = newsocket;
247 /* Perform name and address lookups to resolve the listenning address
249 if (!silc_net_check_local_by_sock(sock[i], &newsocket->hostname,
251 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
253 SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
254 newsocket->hostname ? newsocket->hostname :
255 newsocket->ip ? newsocket->ip : ""));
256 server->stat.conn_failures++;
259 if (!newsocket->hostname)
260 newsocket->hostname = strdup(newsocket->ip);
262 newsocket->port = silc_net_get_local_port(sock[i]);
264 /* Put the allocated socket pointer also to the entry allocated above
265 for fast back-referencing to the socket list. */
266 id_entry->connection = (void *)server->sockets[sock[i]];
267 server->id_entry = id_entry;
270 /* Register the task queues. In SILC we have by default three task queues.
271 One task queue for non-timeout tasks which perform different kind of
272 I/O on file descriptors, timeout task queue for timeout tasks, and,
273 generic non-timeout task queue whose tasks apply to all connections. */
274 silc_task_queue_alloc(&server->io_queue, TRUE);
275 if (!server->io_queue) {
278 silc_task_queue_alloc(&server->timeout_queue, TRUE);
279 if (!server->timeout_queue) {
282 silc_task_queue_alloc(&server->generic_queue, TRUE);
283 if (!server->generic_queue) {
287 /* Register protocols */
288 silc_server_protocols_register();
290 /* Initialize the scheduler */
291 silc_schedule_init(&server->io_queue, &server->timeout_queue,
292 &server->generic_queue,
293 SILC_SERVER_MAX_CONNECTIONS);
295 /* Add the first task to the queue. This is task that is executed by
296 timeout. It expires as soon as the caller calls silc_server_run. This
297 task performs authentication protocol and key exchange with our
299 silc_task_register(server->timeout_queue, sock[0],
300 silc_server_connect_to_router,
301 (void *)server, 0, 1,
303 SILC_TASK_PRI_NORMAL);
305 /* Add listener task to the queue. This task receives new connections to the
306 server. This task remains on the queue until the end of the program. */
307 silc_task_register(server->io_queue, sock[0],
308 silc_server_accept_new_connection,
309 (void *)server, 0, 0,
311 SILC_TASK_PRI_NORMAL);
312 server->listenning = TRUE;
314 /* If server connections has been configured then we must be router as
315 normal server cannot have server connections, only router connections. */
316 if (server->config->servers)
317 server->server_type = SILC_ROUTER;
319 /* Register the ID Cache purge task. This periodically purges the ID cache
320 and removes the expired cache entries. */
322 /* Clients local list */
323 purge = silc_calloc(1, sizeof(*purge));
324 purge->cache = server->local_list->clients;
325 purge->timeout_queue = server->timeout_queue;
326 silc_task_register(purge->timeout_queue, 0,
328 (void *)purge, 600, 0,
329 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
331 /* Clients global list */
332 purge = silc_calloc(1, sizeof(*purge));
333 purge->cache = server->global_list->clients;
334 purge->timeout_queue = server->timeout_queue;
335 silc_task_register(purge->timeout_queue, 0,
337 (void *)purge, 300, 0,
338 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
340 SILC_LOG_DEBUG(("Server initialized"));
342 /* We are done here, return succesfully */
345 silc_task_queue_free(server->timeout_queue);
347 silc_task_queue_free(server->io_queue);
349 for (i = 0; i < sock_count; i++)
350 silc_net_close_server(sock[i]);
355 /* Fork server to background and set gid+uid to non-root.
356 Silcd will not run as root, so trying to set either user or group to
357 root will cause silcd to exit. */
359 void silc_server_daemonise(SilcServer server)
361 /* Are we executing silcd as root or a regular user? */
368 if (!server->config->identity || !server->config->identity->user ||
369 !server->config->identity->group) {
370 fprintf(stderr, "Error:"
371 "\tSILC server must not be run as root. For the security of your\n"
372 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
373 "\tuser account. Modify the [Identity] configuration section to run\n"
374 "\tthe server as non-root user.\n");
378 /* Get the values given for user and group in configuration file */
379 user=server->config->identity->user;
380 group=server->config->identity->group;
382 /* Check whether the user/group information is text */
383 if (atoi(user)!=0 || atoi(group)!=0) {
384 SILC_LOG_DEBUG(("Invalid user and/or group information"));
385 SILC_LOG_DEBUG(("User and/or group given as number"));
386 fprintf(stderr, "Invalid user and/or group information\n");
387 fprintf(stderr, "Please assign them as names, not numbers\n");
391 /* Catch the nasty incident of string "0" returning 0 from atoi */
392 if (strcmp("0", user)==0 || strcmp("0", group)==0) {
393 SILC_LOG_DEBUG(("User and/or group configured to 0. Unacceptable"));
394 fprintf(stderr, "User and/or group configured to 0. Exiting\n");
402 fprintf(stderr, "No such user %s found\n", user);
407 fprintf(stderr, "No such group %s found\n", group);
411 /* Check whether user and/or group is set to root. If yes, exit
412 immediately. Otherwise, setgid and setuid server to user.group */
413 if (gr->gr_gid==0 || pw->pw_uid==0) {
414 fprintf(stderr, "Error:"
415 "\tSILC server must not be run as root. For the security of your\n"
416 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
417 "\tuser account. Modify the [Identity] configuration section to run\n"
418 "\tthe server as non-root user.\n");
421 /* Fork server to background, making it a daemon */
423 SILC_LOG_DEBUG(("Server started as root. Dropping privileges."));
424 SILC_LOG_DEBUG(("Forking SILC server to background"));
429 SILC_LOG_DEBUG(("Changing to group %s", group));
430 if(setgid(gr->gr_gid)==0) {
431 SILC_LOG_DEBUG(("Setgid to %s", group));
433 SILC_LOG_DEBUG(("Setgid to %s failed", group));
434 fprintf(stderr, "Tried to setgid %s but no such group. Exiting\n",
438 SILC_LOG_DEBUG(("Changing to user nobody"));
439 if(setuid(pw->pw_uid)==0) {
440 SILC_LOG_DEBUG(("Setuid to %s", user));
442 SILC_LOG_DEBUG(("Setuid to %s failed", user));
443 fprintf(stderr, "Tried to setuid %s but no such user. Exiting\n",
449 /* Fork server to background, making it a daemon */
451 SILC_LOG_DEBUG(("Server started as user"));
452 SILC_LOG_DEBUG(("Forking SILC server to background"));
459 /* Stops the SILC server. This function is used to shutdown the server.
460 This is usually called after the scheduler has returned. After stopping
461 the server one should call silc_server_free. */
463 void silc_server_stop(SilcServer server)
465 SILC_LOG_DEBUG(("Stopping server"));
467 /* Stop the scheduler, although it might be already stopped. This
468 doesn't hurt anyone. This removes all the tasks and task queues,
470 silc_schedule_stop();
471 silc_schedule_uninit();
473 silc_server_protocols_unregister();
475 SILC_LOG_DEBUG(("Server stopped"));
478 /* The heart of the server. This runs the scheduler thus runs the server.
479 When this returns the server has been stopped and the program will
482 void silc_server_run(SilcServer server)
484 SILC_LOG_DEBUG(("Running server"));
486 SILC_LOG_INFO(("SILC Server started"));
488 /* Start the scheduler, the heart of the SILC server. When this returns
489 the program will be terminated. */
493 /* Timeout callback that will be called to retry connecting to remote
494 router. This is used by both normal and router server. This will wait
495 before retrying the connecting. The timeout is generated by exponential
496 backoff algorithm. */
498 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
500 SilcServerConnection sconn = (SilcServerConnection)context;
501 SilcServer server = sconn->server;
503 SILC_LOG_INFO(("Retrying connecting to a router"));
505 /* Calculate next timeout */
506 if (sconn->retry_count >= 1) {
507 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
508 if (sconn->retry_timeout > SILC_SERVER_RETRY_INTERVAL_MAX)
509 sconn->retry_timeout = SILC_SERVER_RETRY_INTERVAL_MAX;
511 sconn->retry_timeout = server->params->retry_interval_min;
513 sconn->retry_count++;
514 sconn->retry_timeout = sconn->retry_timeout +
515 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
517 /* If we've reached max retry count, give up. */
518 if (sconn->retry_count > server->params->retry_count &&
519 server->params->retry_keep_trying == FALSE) {
520 SILC_LOG_ERROR(("Could not connect to router, giving up"));
524 /* Wait one before retrying */
525 silc_task_register(server->timeout_queue, fd, silc_server_connect_router,
526 context, sconn->retry_timeout,
527 server->params->retry_interval_min_usec,
528 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
531 /* Generic routine to use connect to a router. */
533 SILC_TASK_CALLBACK(silc_server_connect_router)
535 SilcServerConnection sconn = (SilcServerConnection)context;
536 SilcServer server = sconn->server;
537 SilcSocketConnection newsocket;
538 SilcProtocol protocol;
539 SilcServerKEInternalContext *proto_ctx;
542 SILC_LOG_INFO(("Connecting to the router %s on port %d",
543 sconn->remote_host, sconn->remote_port));
545 /* Connect to remote host */
546 sock = silc_net_create_connection(sconn->remote_port,
549 SILC_LOG_ERROR(("Could not connect to router"));
550 silc_task_register(server->timeout_queue, fd,
551 silc_server_connect_to_router_retry,
552 context, 0, 1, SILC_TASK_TIMEOUT,
553 SILC_TASK_PRI_NORMAL);
557 /* Set socket options */
558 silc_net_set_socket_nonblock(sock);
559 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
561 /* Create socket connection for the connection. Even though we
562 know that we are connecting to a router we will mark the socket
563 to be unknown connection until we have executed authentication
565 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
566 server->sockets[sock] = newsocket;
567 newsocket->hostname = strdup(sconn->remote_host);
568 newsocket->ip = strdup(sconn->remote_host);
569 newsocket->port = sconn->remote_port;
570 sconn->sock = newsocket;
572 /* Allocate internal protocol context. This is sent as context
574 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
575 proto_ctx->server = (void *)server;
576 proto_ctx->context = (void *)sconn;
577 proto_ctx->sock = newsocket;
578 proto_ctx->rng = server->rng;
579 proto_ctx->responder = FALSE;
581 /* Perform key exchange protocol. silc_server_connect_to_router_second
582 will be called after the protocol is finished. */
583 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
584 &protocol, proto_ctx,
585 silc_server_connect_to_router_second);
586 newsocket->protocol = protocol;
588 /* Register a timeout task that will be executed if the protocol
589 is not executed within set limit. */
590 proto_ctx->timeout_task =
591 silc_task_register(server->timeout_queue, sock,
592 silc_server_timeout_remote,
593 server, server->params->protocol_timeout,
594 server->params->protocol_timeout_usec,
598 /* Register the connection for network input and output. This sets
599 that scheduler will listen for incoming packets for this connection
600 and sets that outgoing packets may be sent to this connection as
601 well. However, this doesn't set the scheduler for outgoing traffic,
602 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
603 later when outgoing data is available. */
604 context = (void *)server;
605 SILC_REGISTER_CONNECTION_FOR_IO(sock);
607 /* Run the protocol */
608 silc_protocol_execute(protocol, server->timeout_queue, 0, 0);
611 /* This function connects to our primary router or if we are a router this
612 establishes all our primary routes. This is called at the start of the
613 server to do authentication and key exchange with our router - called
616 SILC_TASK_CALLBACK(silc_server_connect_to_router)
618 SilcServer server = (SilcServer)context;
619 SilcServerConnection sconn;
621 SILC_LOG_DEBUG(("Connecting to router(s)"));
623 /* If we are normal SILC server we need to connect to our cell's
625 if (server->server_type == SILC_SERVER) {
626 SILC_LOG_DEBUG(("We are normal server"));
628 /* Create connection to the router, if configured. */
629 if (server->config->routers) {
631 /* Allocate connection object for hold connection specific stuff. */
632 sconn = silc_calloc(1, sizeof(*sconn));
633 sconn->server = server;
634 sconn->remote_host = strdup(server->config->routers->host);
635 sconn->remote_port = server->config->routers->port;
637 silc_task_register(server->timeout_queue, fd,
638 silc_server_connect_router,
639 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
640 SILC_TASK_PRI_NORMAL);
645 /* If we are a SILC router we need to establish all of our primary
647 if (server->server_type == SILC_ROUTER) {
648 SilcServerConfigSectionServerConnection *ptr;
650 SILC_LOG_DEBUG(("We are router"));
652 /* Create the connections to all our routes */
653 ptr = server->config->routers;
656 SILC_LOG_DEBUG(("Router connection [%s] %s:%d",
657 ptr->initiator ? "Initiator" : "Responder",
658 ptr->host, ptr->port));
660 if (ptr->initiator) {
661 /* Allocate connection object for hold connection specific stuff. */
662 sconn = silc_calloc(1, sizeof(*sconn));
663 sconn->server = server;
664 sconn->remote_host = strdup(ptr->host);
665 sconn->remote_port = ptr->port;
667 silc_task_register(server->timeout_queue, fd,
668 silc_server_connect_router,
669 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
670 SILC_TASK_PRI_NORMAL);
680 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
682 /* There wasn't a configured router, we will continue but we don't
683 have a connection to outside world. We will be standalone server. */
684 server->standalone = TRUE;
687 /* Second part of connecting to router(s). Key exchange protocol has been
688 executed and now we will execute authentication protocol. */
690 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
692 SilcProtocol protocol = (SilcProtocol)context;
693 SilcServerKEInternalContext *ctx =
694 (SilcServerKEInternalContext *)protocol->context;
695 SilcServer server = (SilcServer)ctx->server;
696 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
697 SilcSocketConnection sock = ctx->sock;
698 SilcServerConnAuthInternalContext *proto_ctx;
699 SilcServerConfigSectionServerConnection *conn = NULL;
701 SILC_LOG_DEBUG(("Start"));
703 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
704 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
705 /* Error occured during protocol */
706 silc_protocol_free(protocol);
707 sock->protocol = NULL;
708 silc_ske_free_key_material(ctx->keymat);
710 silc_packet_context_free(ctx->packet);
712 silc_ske_free(ctx->ske);
714 silc_free(ctx->dest_id);
716 silc_task_unregister_by_callback(server->timeout_queue,
717 silc_server_failure_callback);
718 silc_server_disconnect_remote(server, sock, "Server closed connection: "
719 "Key exchange failed");
723 /* We now have the key material as the result of the key exchange
724 protocol. Take the key material into use. Free the raw key material
725 as soon as we've set them into use. */
726 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
727 ctx->ske->prop->cipher,
728 ctx->ske->prop->pkcs,
729 ctx->ske->prop->hash,
730 ctx->ske->prop->hmac,
731 ctx->ske->prop->group,
733 silc_protocol_free(protocol);
734 sock->protocol = NULL;
735 silc_ske_free_key_material(ctx->keymat);
737 silc_packet_context_free(ctx->packet);
739 silc_ske_free(ctx->ske);
741 silc_free(ctx->dest_id);
743 silc_task_unregister_by_callback(server->timeout_queue,
744 silc_server_failure_callback);
745 silc_server_disconnect_remote(server, sock, "Server closed connection: "
746 "Key exchange failed");
749 silc_ske_free_key_material(ctx->keymat);
751 /* Allocate internal context for the authentication protocol. This
752 is sent as context for the protocol. */
753 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
754 proto_ctx->server = (void *)server;
755 proto_ctx->context = (void *)sconn;
756 proto_ctx->sock = sock;
757 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
758 proto_ctx->dest_id_type = ctx->dest_id_type;
759 proto_ctx->dest_id = ctx->dest_id;
761 /* Resolve the authentication method used in this connection. Check if
762 we find a match from user configured connections */
763 conn = silc_server_config_find_router_conn(server->config,
767 /* Match found. Use the configured authentication method */
768 proto_ctx->auth_meth = conn->auth_meth;
769 if (conn->auth_data) {
770 proto_ctx->auth_data = strdup(conn->auth_data);
771 proto_ctx->auth_data_len = strlen(conn->auth_data);
774 SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
775 sock->hostname, sock->ip, sock->port));
776 silc_protocol_free(protocol);
777 sock->protocol = NULL;
779 silc_packet_context_free(ctx->packet);
781 silc_ske_free(ctx->ske);
783 silc_free(ctx->dest_id);
785 silc_task_unregister_by_callback(server->timeout_queue,
786 silc_server_failure_callback);
787 silc_server_disconnect_remote(server, sock, "Server closed connection: "
788 "Key exchange failed");
792 /* Free old protocol as it is finished now */
793 silc_protocol_free(protocol);
795 silc_packet_context_free(ctx->packet);
797 sock->protocol = NULL;
799 /* Allocate the authentication protocol. This is allocated here
800 but we won't start it yet. We will be receiving party of this
801 protocol thus we will wait that connecting party will make
803 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
804 &sock->protocol, proto_ctx,
805 silc_server_connect_to_router_final);
807 /* Register timeout task. If the protocol is not executed inside
808 this timelimit the connection will be terminated. Currently
809 this is 15 seconds and is hard coded limit (XXX). */
810 proto_ctx->timeout_task =
811 silc_task_register(server->timeout_queue, sock->sock,
812 silc_server_timeout_remote,
813 (void *)server, 15, 0,
817 /* Run the protocol */
818 silc_protocol_execute(sock->protocol, server->timeout_queue, 0, 0);
821 /* Finalizes the connection to router. Registers a server task to the
822 queue so that we can accept new connections. */
824 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
826 SilcProtocol protocol = (SilcProtocol)context;
827 SilcServerConnAuthInternalContext *ctx =
828 (SilcServerConnAuthInternalContext *)protocol->context;
829 SilcServer server = (SilcServer)ctx->server;
830 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
831 SilcSocketConnection sock = ctx->sock;
832 SilcServerEntry id_entry;
834 SilcServerHBContext hb_context;
835 unsigned char *id_string;
837 SilcIDListData idata;
839 SILC_LOG_DEBUG(("Start"));
841 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
842 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
843 /* Error occured during protocol */
845 silc_free(ctx->dest_id);
846 silc_server_disconnect_remote(server, sock, "Server closed connection: "
847 "Authentication failed");
851 /* Add a task to the queue. This task receives new connections to the
852 server. This task remains on the queue until the end of the program. */
853 if (!server->listenning) {
854 silc_task_register(server->io_queue, server->sock,
855 silc_server_accept_new_connection,
856 (void *)server, 0, 0,
858 SILC_TASK_PRI_NORMAL);
859 server->listenning = TRUE;
862 /* Send NEW_SERVER packet to the router. We will become registered
863 to the SILC network after sending this packet. */
864 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
865 id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
866 packet = silc_buffer_alloc(2 + 2 + id_len + strlen(server->server_name));
867 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
868 silc_buffer_format(packet,
869 SILC_STR_UI_SHORT(id_len),
870 SILC_STR_UI_XNSTRING(id_string, id_len),
871 SILC_STR_UI_SHORT(strlen(server->server_name)),
872 SILC_STR_UI_XNSTRING(server->server_name,
873 strlen(server->server_name)),
876 /* Send the packet */
877 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
878 packet->data, packet->len, TRUE);
879 silc_buffer_free(packet);
880 silc_free(id_string);
882 SILC_LOG_DEBUG(("Connected to router %s", sock->hostname));
884 /* Add the connected router to local server list */
885 server->standalone = FALSE;
886 id_entry = silc_idlist_add_server(server->local_list, strdup(sock->hostname),
887 SILC_ROUTER, ctx->dest_id, NULL, sock);
890 silc_free(ctx->dest_id);
891 silc_server_disconnect_remote(server, sock, "Server closed connection: "
892 "Authentication failed");
896 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
897 silc_free(sock->user_data);
898 sock->user_data = (void *)id_entry;
899 sock->type = SILC_SOCKET_TYPE_ROUTER;
900 server->id_entry->router = id_entry;
901 server->router = id_entry;
902 idata = (SilcIDListData)sock->user_data;
903 idata->registered = TRUE;
905 /* Perform keepalive. The `hb_context' will be freed automatically
906 when finally calling the silc_socket_free function. XXX hardcoded
908 hb_context = silc_calloc(1, sizeof(*hb_context));
909 hb_context->server = server;
910 silc_socket_set_heartbeat(sock, 600, hb_context,
911 silc_server_perform_heartbeat,
912 server->timeout_queue);
914 /* Register re-key timeout */
915 idata->rekey->timeout = 3600; /* XXX hardcoded */
916 idata->rekey->context = (void *)server;
917 silc_task_register(server->timeout_queue, sock->sock,
918 silc_server_rekey_callback,
919 (void *)sock, idata->rekey->timeout, 0,
920 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
922 /* If we are router then announce our possible servers. */
923 if (server->server_type == SILC_ROUTER)
924 silc_server_announce_servers(server);
926 /* Announce our clients and channels to the router */
927 silc_server_announce_clients(server);
928 silc_server_announce_channels(server);
931 /* Free the temporary connection data context */
933 silc_free(sconn->remote_host);
937 /* Free the protocol object */
938 silc_protocol_free(protocol);
940 silc_packet_context_free(ctx->packet);
942 silc_ske_free(ctx->ske);
944 sock->protocol = NULL;
947 /* Accepts new connections to the server. Accepting new connections are
948 done in three parts to make it async. */
950 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
952 SilcServer server = (SilcServer)context;
953 SilcSocketConnection newsocket;
954 SilcServerKEInternalContext *proto_ctx;
956 void *cconfig, *sconfig, *rconfig;
957 SilcServerConfigSectionDenyConnection *deny;
959 SILC_LOG_DEBUG(("Accepting new connection"));
961 server->stat.conn_attempts++;
963 sock = silc_net_accept_connection(server->sock);
965 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
966 server->stat.conn_failures++;
970 /* Check max connections */
971 if (sock > SILC_SERVER_MAX_CONNECTIONS) {
972 SILC_LOG_ERROR(("Refusing connection, server is full"));
973 server->stat.conn_failures++;
977 /* Set socket options */
978 silc_net_set_socket_nonblock(sock);
979 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
981 /* We don't create a ID yet, since we don't know what type of connection
982 this is yet. But, we do add the connection to the socket table. */
983 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
984 server->sockets[sock] = newsocket;
986 /* XXX This MUST be done async as this will block the entire server
987 process. Either we have to do our own resolver stuff or in the future
988 we can use threads. */
989 /* Perform name and address lookups for the remote host. */
990 if (!silc_net_check_host_by_sock(sock, &newsocket->hostname,
992 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
994 SILC_LOG_ERROR(("IP/DNS lookup failed %s",
995 newsocket->hostname ? newsocket->hostname :
996 newsocket->ip ? newsocket->ip : ""));
997 server->stat.conn_failures++;
1000 if (!newsocket->hostname)
1001 newsocket->hostname = strdup(newsocket->ip);
1003 newsocket->port = silc_net_get_remote_port(sock);
1005 /* Register the connection for network input and output. This sets
1006 that scheduler will listen for incoming packets for this connection
1007 and sets that outgoing packets may be sent to this connection as well.
1008 However, this doesn't set the scheduler for outgoing traffic, it
1009 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1010 later when outgoing data is available. */
1011 SILC_REGISTER_CONNECTION_FOR_IO(sock);
1013 SILC_LOG_INFO(("Incoming connection from %s (%s)", newsocket->hostname,
1016 port = server->sockets[fd]->port; /* Listenning port */
1018 /* Check whether this connection is denied to connect to us. */
1019 deny = silc_server_config_denied_conn(server->config, newsocket->ip, port);
1021 deny = silc_server_config_denied_conn(server->config, newsocket->hostname,
1024 /* The connection is denied */
1025 SILC_LOG_INFO(("Connection %s (%s) is denied",
1026 newsocket->hostname, newsocket->ip));
1027 silc_server_disconnect_remote(server, newsocket, deny->comment ?
1029 "Server closed connection: "
1030 "Connection refused");
1031 server->stat.conn_failures++;
1035 /* Check whether we have configred this sort of connection at all. We
1036 have to check all configurations since we don't know what type of
1037 connection this is. */
1038 if (!(cconfig = silc_server_config_find_client_conn(server->config,
1039 newsocket->ip, port)))
1040 cconfig = silc_server_config_find_client_conn(server->config,
1041 newsocket->hostname,
1043 if (!(sconfig = silc_server_config_find_server_conn(server->config,
1046 sconfig = silc_server_config_find_server_conn(server->config,
1047 newsocket->hostname,
1049 if (!(rconfig = silc_server_config_find_router_conn(server->config,
1050 newsocket->ip, port)))
1051 rconfig = silc_server_config_find_router_conn(server->config,
1052 newsocket->hostname,
1054 if (!cconfig && !sconfig && !rconfig) {
1055 silc_server_disconnect_remote(server, newsocket,
1056 "Server closed connection: "
1057 "Connection refused");
1058 server->stat.conn_failures++;
1062 /* The connection is allowed */
1064 /* Allocate internal context for key exchange protocol. This is
1065 sent as context for the protocol. */
1066 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1067 proto_ctx->server = context;
1068 proto_ctx->sock = newsocket;
1069 proto_ctx->rng = server->rng;
1070 proto_ctx->responder = TRUE;
1071 proto_ctx->cconfig = cconfig;
1072 proto_ctx->sconfig = sconfig;
1073 proto_ctx->rconfig = rconfig;
1075 /* Prepare the connection for key exchange protocol. We allocate the
1076 protocol but will not start it yet. The connector will be the
1077 initiator of the protocol thus we will wait for initiation from
1078 there before we start the protocol. */
1079 server->stat.auth_attempts++;
1080 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1081 &newsocket->protocol, proto_ctx,
1082 silc_server_accept_new_connection_second);
1084 /* Register a timeout task that will be executed if the connector
1085 will not start the key exchange protocol within 60 seconds. For
1086 now, this is a hard coded limit. After 60 secs the connection will
1087 be closed if the key exchange protocol has not been started. */
1088 proto_ctx->timeout_task =
1089 silc_task_register(server->timeout_queue, newsocket->sock,
1090 silc_server_timeout_remote,
1096 /* Second part of accepting new connection. Key exchange protocol has been
1097 performed and now it is time to do little connection authentication
1098 protocol to figure out whether this connection is client or server
1099 and whether it has right to access this server (especially server
1100 connections needs to be authenticated). */
1102 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1104 SilcProtocol protocol = (SilcProtocol)context;
1105 SilcServerKEInternalContext *ctx =
1106 (SilcServerKEInternalContext *)protocol->context;
1107 SilcServer server = (SilcServer)ctx->server;
1108 SilcSocketConnection sock = ctx->sock;
1109 SilcServerConnAuthInternalContext *proto_ctx;
1111 SILC_LOG_DEBUG(("Start"));
1113 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1114 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1115 /* Error occured during protocol */
1116 silc_protocol_free(protocol);
1117 sock->protocol = NULL;
1118 silc_ske_free_key_material(ctx->keymat);
1120 silc_packet_context_free(ctx->packet);
1122 silc_ske_free(ctx->ske);
1124 silc_free(ctx->dest_id);
1126 silc_task_unregister_by_callback(server->timeout_queue,
1127 silc_server_failure_callback);
1128 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1129 "Key exchange failed");
1130 server->stat.auth_failures++;
1134 /* We now have the key material as the result of the key exchange
1135 protocol. Take the key material into use. Free the raw key material
1136 as soon as we've set them into use. */
1137 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
1138 ctx->ske->prop->cipher,
1139 ctx->ske->prop->pkcs,
1140 ctx->ske->prop->hash,
1141 ctx->ske->prop->hmac,
1142 ctx->ske->prop->group,
1144 silc_protocol_free(protocol);
1145 sock->protocol = NULL;
1146 silc_ske_free_key_material(ctx->keymat);
1148 silc_packet_context_free(ctx->packet);
1150 silc_ske_free(ctx->ske);
1152 silc_free(ctx->dest_id);
1154 silc_task_unregister_by_callback(server->timeout_queue,
1155 silc_server_failure_callback);
1156 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1157 "Key exchange failed");
1158 server->stat.auth_failures++;
1161 silc_ske_free_key_material(ctx->keymat);
1163 /* Allocate internal context for the authentication protocol. This
1164 is sent as context for the protocol. */
1165 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1166 proto_ctx->server = (void *)server;
1167 proto_ctx->sock = sock;
1168 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
1169 proto_ctx->responder = TRUE;
1170 proto_ctx->dest_id_type = ctx->dest_id_type;
1171 proto_ctx->dest_id = ctx->dest_id;
1172 proto_ctx->cconfig = ctx->cconfig;
1173 proto_ctx->sconfig = ctx->sconfig;
1174 proto_ctx->rconfig = ctx->rconfig;
1176 /* Free old protocol as it is finished now */
1177 silc_protocol_free(protocol);
1179 silc_packet_context_free(ctx->packet);
1181 sock->protocol = NULL;
1183 /* Allocate the authentication protocol. This is allocated here
1184 but we won't start it yet. We will be receiving party of this
1185 protocol thus we will wait that connecting party will make
1186 their first move. */
1187 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1188 &sock->protocol, proto_ctx,
1189 silc_server_accept_new_connection_final);
1191 /* Register timeout task. If the protocol is not executed inside
1192 this timelimit the connection will be terminated. Currently
1193 this is 60 seconds and is hard coded limit (XXX). */
1194 proto_ctx->timeout_task =
1195 silc_task_register(server->timeout_queue, sock->sock,
1196 silc_server_timeout_remote,
1197 (void *)server, 60, 0,
1202 /* Final part of accepting new connection. The connection has now
1203 been authenticated and keys has been exchanged. We also know whether
1204 this is client or server connection. */
1206 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1208 SilcProtocol protocol = (SilcProtocol)context;
1209 SilcServerConnAuthInternalContext *ctx =
1210 (SilcServerConnAuthInternalContext *)protocol->context;
1211 SilcServer server = (SilcServer)ctx->server;
1212 SilcSocketConnection sock = ctx->sock;
1213 SilcServerHBContext hb_context;
1214 void *id_entry = NULL;
1216 SILC_LOG_DEBUG(("Start"));
1218 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1219 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1220 /* Error occured during protocol */
1221 silc_protocol_free(protocol);
1222 sock->protocol = NULL;
1224 silc_packet_context_free(ctx->packet);
1226 silc_ske_free(ctx->ske);
1228 silc_free(ctx->dest_id);
1231 sock->protocol = NULL;
1232 silc_task_unregister_by_callback(server->timeout_queue,
1233 silc_server_failure_callback);
1234 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1235 "Authentication failed");
1236 server->stat.auth_failures++;
1240 sock->type = ctx->conn_type;
1241 switch(sock->type) {
1242 case SILC_SOCKET_TYPE_CLIENT:
1244 SilcClientEntry client;
1246 SILC_LOG_DEBUG(("Remote host is client"));
1247 SILC_LOG_INFO(("Connection from %s (%s) is client", sock->hostname,
1250 /* Add the client to the client ID cache. The nickname and Client ID
1251 and other information is created after we have received NEW_CLIENT
1252 packet from client. */
1253 client = silc_idlist_add_client(server->local_list,
1254 NULL, NULL, NULL, NULL, NULL, sock);
1256 SILC_LOG_ERROR(("Could not add new client to cache"));
1257 silc_free(sock->user_data);
1262 server->stat.my_clients++;
1263 server->stat.clients++;
1264 if (server->server_type == SILC_ROUTER)
1265 server->stat.cell_clients++;
1267 id_entry = (void *)client;
1270 case SILC_SOCKET_TYPE_SERVER:
1271 case SILC_SOCKET_TYPE_ROUTER:
1273 SilcServerEntry new_server;
1274 SilcServerConfigSectionServerConnection *conn =
1275 sock->type == SILC_SOCKET_TYPE_SERVER ? ctx->sconfig : ctx->rconfig;
1277 SILC_LOG_DEBUG(("Remote host is %s",
1278 sock->type == SILC_SOCKET_TYPE_SERVER ?
1279 "server" : "router"));
1280 SILC_LOG_INFO(("Connection from %s (%s) is %s", sock->hostname,
1281 sock->ip, sock->type == SILC_SOCKET_TYPE_SERVER ?
1282 "server" : "router"));
1284 /* Add the server into server cache. The server name and Server ID
1285 is updated after we have received NEW_SERVER packet from the
1286 server. We mark ourselves as router for this server if we really
1289 silc_idlist_add_server(server->local_list, NULL,
1290 sock->type == SILC_SOCKET_TYPE_SERVER ?
1291 SILC_SERVER : SILC_ROUTER, NULL,
1292 sock->type == SILC_SOCKET_TYPE_SERVER ?
1293 server->id_entry : NULL, sock);
1295 SILC_LOG_ERROR(("Could not add new server to cache"));
1296 silc_free(sock->user_data);
1301 if (sock->type == SILC_SOCKET_TYPE_SERVER)
1302 server->stat.my_servers++;
1304 server->stat.my_routers++;
1305 server->stat.servers++;
1307 id_entry = (void *)new_server;
1309 /* Check whether this connection is to be our primary router connection
1310 if we dont' already have the primary route. */
1311 if (server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER) {
1312 if (silc_server_config_is_primary_route(server->config) &&
1316 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1317 server->standalone = FALSE;
1318 if (!server->id_entry->router) {
1319 server->id_entry->router = id_entry;
1320 server->router = id_entry;
1330 /* Add the common data structure to the ID entry. */
1332 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1334 /* Add to sockets internal pointer for fast referencing */
1335 silc_free(sock->user_data);
1336 sock->user_data = id_entry;
1338 /* Connection has been fully established now. Everything is ok. */
1339 SILC_LOG_DEBUG(("New connection authenticated"));
1341 /* Perform keepalive. The `hb_context' will be freed automatically
1342 when finally calling the silc_socket_free function. XXX hardcoded
1344 hb_context = silc_calloc(1, sizeof(*hb_context));
1345 hb_context->server = server;
1346 silc_socket_set_heartbeat(sock, 600, hb_context,
1347 silc_server_perform_heartbeat,
1348 server->timeout_queue);
1350 silc_task_unregister_by_callback(server->timeout_queue,
1351 silc_server_failure_callback);
1352 silc_protocol_free(protocol);
1354 silc_packet_context_free(ctx->packet);
1356 silc_ske_free(ctx->ske);
1358 silc_free(ctx->dest_id);
1360 sock->protocol = NULL;
1363 /* This function is used to read packets from network and send packets to
1364 network. This is usually a generic task. */
1366 SILC_TASK_CALLBACK(silc_server_packet_process)
1368 SilcServer server = (SilcServer)context;
1369 SilcSocketConnection sock = server->sockets[fd];
1370 SilcIDListData idata;
1371 SilcCipher cipher = NULL;
1372 SilcHmac hmac = NULL;
1378 SILC_LOG_DEBUG(("Processing packet"));
1380 /* Packet sending */
1382 if (type == SILC_TASK_WRITE) {
1383 /* Do not send data to disconnected connection */
1384 if (SILC_IS_DISCONNECTED(sock))
1387 server->stat.packets_sent++;
1389 if (sock->outbuf->data - sock->outbuf->head)
1390 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1392 /* Send the packet */
1393 ret = silc_packet_send(sock, TRUE);
1395 /* If returned -2 could not write to connection now, will do
1403 /* The packet has been sent and now it is time to set the connection
1404 back to only for input. When there is again some outgoing data
1405 available for this connection it will be set for output as well.
1406 This call clears the output setting and sets it only for input. */
1407 SILC_SET_CONNECTION_FOR_INPUT(fd);
1408 SILC_UNSET_OUTBUF_PENDING(sock);
1410 silc_buffer_clear(sock->outbuf);
1414 /* Packet receiving */
1416 /* Read some data from connection */
1417 ret = silc_packet_receive(sock);
1423 SILC_LOG_DEBUG(("Read EOF"));
1425 /* If connection is disconnecting already we will finally
1426 close the connection */
1427 if (SILC_IS_DISCONNECTING(sock)) {
1428 if (sock->user_data)
1429 silc_server_free_sock_user_data(server, sock);
1430 silc_server_close_connection(server, sock);
1434 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1435 SILC_SET_DISCONNECTING(sock);
1437 /* If the closed connection was our primary router connection the
1438 start re-connecting phase. */
1439 if (!server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER &&
1440 sock == server->router->connection)
1441 silc_task_register(server->timeout_queue, 0,
1442 silc_server_connect_to_router,
1445 SILC_TASK_PRI_NORMAL);
1447 if (sock->user_data)
1448 silc_server_free_sock_user_data(server, sock);
1449 silc_server_close_connection(server, sock);
1453 /* If connection is disconnecting or disconnected we will ignore
1455 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1456 SILC_LOG_DEBUG(("Ignoring read data from disonnected connection"));
1460 server->stat.packets_received++;
1462 /* Get keys and stuff from ID entry */
1463 idata = (SilcIDListData)sock->user_data;
1465 idata->last_receive = time(NULL);
1466 cipher = idata->receive_key;
1467 hmac = idata->hmac_receive;
1470 /* Process the packet. This will call the parser that will then
1471 decrypt and parse the packet. */
1472 silc_packet_receive_process(sock, cipher, hmac, silc_server_packet_parse,
1476 /* Callback function that the silc_packet_decrypt will call to make the
1477 decision whether the packet is normal or special packet. We will
1478 return TRUE if it is normal and FALSE if it is special */
1480 static int silc_server_packet_decrypt_check(SilcPacketType packet_type,
1482 SilcPacketContext *packet,
1485 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1486 SilcServer server = (SilcServer)parse_ctx->context;
1488 /* Packet is normal packet, if:
1490 1) packet is private message packet and does not have private key set
1491 2) is other packet than channel message packet
1492 3) is channel message packet and remote is router and we are router
1494 all other packets are special packets
1497 if (packet_type == SILC_PACKET_PRIVATE_MESSAGE &&
1498 (buffer->data[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
1501 if (packet_type != SILC_PACKET_CHANNEL_MESSAGE ||
1502 (packet_type == SILC_PACKET_CHANNEL_MESSAGE &&
1503 parse_ctx->sock->type == SILC_SOCKET_TYPE_ROUTER &&
1504 server->server_type == SILC_ROUTER))
1510 /* Parses whole packet, received earlier. */
1512 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1514 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1515 SilcServer server = (SilcServer)parse_ctx->context;
1516 SilcSocketConnection sock = parse_ctx->sock;
1517 SilcPacketContext *packet = parse_ctx->packet;
1518 SilcIDListData idata = (SilcIDListData)sock->user_data;
1521 SILC_LOG_DEBUG(("Start"));
1523 /* Decrypt the received packet */
1524 ret = silc_packet_decrypt(idata ? idata->receive_key : NULL,
1525 idata ? idata->hmac_receive : NULL,
1526 packet->buffer, packet,
1527 silc_server_packet_decrypt_check, parse_ctx);
1532 /* Parse the packet. Packet type is returned. */
1533 ret = silc_packet_parse(packet);
1535 /* Parse the packet header in special way as this is "special"
1537 ret = silc_packet_parse_special(packet);
1540 if (ret == SILC_PACKET_NONE)
1543 /* Check that the the current client ID is same as in the client's packet. */
1544 if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
1545 SilcClientEntry client = (SilcClientEntry)sock->user_data;
1546 if (client && client->id) {
1547 void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
1548 packet->src_id_type);
1549 if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
1557 if (server->server_type == SILC_ROUTER) {
1558 /* Route the packet if it is not destined to us. Other ID types but
1559 server are handled separately after processing them. */
1560 if (!(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
1561 packet->dst_id_type == SILC_ID_SERVER &&
1562 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1563 memcmp(packet->dst_id, server->id_string, packet->dst_id_len)) {
1565 /* Route the packet to fastest route for the destination ID */
1566 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
1567 packet->dst_id_type);
1570 silc_server_packet_route(server,
1571 silc_server_route_get(server, id,
1572 packet->dst_id_type),
1579 /* Parse the incoming packet type */
1580 silc_server_packet_parse_type(server, sock, packet);
1582 if (server->server_type == SILC_ROUTER) {
1583 /* Broadcast packet if it is marked as broadcast packet and it is
1584 originated from router and we are router. */
1585 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1586 packet->flags & SILC_PACKET_FLAG_BROADCAST &&
1587 !server->standalone) {
1588 silc_server_packet_broadcast(server, server->router->connection, packet);
1593 /* silc_buffer_clear(sock->inbuf); */
1594 silc_packet_context_free(packet);
1595 silc_free(parse_ctx);
1598 /* Parser callback called by silc_packet_receive_process. This merely
1599 registers timeout that will handle the actual parsing when appropriate. */
1601 void silc_server_packet_parse(SilcPacketParserContext *parser_context)
1603 SilcServer server = (SilcServer)parser_context->context;
1604 SilcSocketConnection sock = parser_context->sock;
1606 switch (sock->type) {
1607 case SILC_SOCKET_TYPE_UNKNOWN:
1608 case SILC_SOCKET_TYPE_CLIENT:
1609 /* Parse the packet with timeout */
1610 silc_task_register(server->timeout_queue, sock->sock,
1611 silc_server_packet_parse_real,
1612 (void *)parser_context, 0, 100000,
1614 SILC_TASK_PRI_NORMAL);
1616 case SILC_SOCKET_TYPE_SERVER:
1617 case SILC_SOCKET_TYPE_ROUTER:
1618 /* Packets from servers are parsed as soon as possible */
1619 silc_task_register(server->timeout_queue, sock->sock,
1620 silc_server_packet_parse_real,
1621 (void *)parser_context, 0, 1,
1623 SILC_TASK_PRI_NORMAL);
1630 /* Parses the packet type and calls what ever routines the packet type
1631 requires. This is done for all incoming packets. */
1633 void silc_server_packet_parse_type(SilcServer server,
1634 SilcSocketConnection sock,
1635 SilcPacketContext *packet)
1637 SilcPacketType type = packet->type;
1639 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1641 /* Parse the packet type */
1643 case SILC_PACKET_DISCONNECT:
1644 SILC_LOG_DEBUG(("Disconnect packet"));
1645 if (packet->flags & SILC_PACKET_FLAG_LIST)
1649 case SILC_PACKET_SUCCESS:
1651 * Success received for something. For now we can have only
1652 * one protocol for connection executing at once hence this
1653 * success message is for whatever protocol is executing currently.
1655 SILC_LOG_DEBUG(("Success packet"));
1656 if (packet->flags & SILC_PACKET_FLAG_LIST)
1659 silc_protocol_execute(sock->protocol, server->timeout_queue, 0, 0);
1662 case SILC_PACKET_FAILURE:
1664 * Failure received for something. For now we can have only
1665 * one protocol for connection executing at once hence this
1666 * failure message is for whatever protocol is executing currently.
1668 SILC_LOG_DEBUG(("Failure packet"));
1669 if (packet->flags & SILC_PACKET_FLAG_LIST)
1671 if (sock->protocol) {
1672 SilcServerFailureContext f;
1673 f = silc_calloc(1, sizeof(*f));
1677 /* We will wait 5 seconds to process this failure packet */
1678 silc_task_register(server->timeout_queue, sock->sock,
1679 silc_server_failure_callback, (void *)f, 5, 0,
1680 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1684 case SILC_PACKET_REJECT:
1685 SILC_LOG_DEBUG(("Reject packet"));
1686 if (packet->flags & SILC_PACKET_FLAG_LIST)
1691 case SILC_PACKET_NOTIFY:
1693 * Received notify packet. Server can receive notify packets from
1694 * router. Server then relays the notify messages to clients if needed.
1696 SILC_LOG_DEBUG(("Notify packet"));
1697 if (packet->flags & SILC_PACKET_FLAG_LIST)
1698 silc_server_notify_list(server, sock, packet);
1700 silc_server_notify(server, sock, packet);
1706 case SILC_PACKET_CHANNEL_MESSAGE:
1708 * Received channel message. Channel messages are special packets
1709 * (although probably most common ones) thus they are handled
1712 SILC_LOG_DEBUG(("Channel Message packet"));
1713 if (packet->flags & SILC_PACKET_FLAG_LIST)
1715 silc_server_channel_message(server, sock, packet);
1718 case SILC_PACKET_CHANNEL_KEY:
1720 * Received key for channel. As channels are created by the router
1721 * the keys are as well. We will distribute the key to all of our
1722 * locally connected clients on the particular channel. Router
1723 * never receives this channel and thus is ignored.
1725 SILC_LOG_DEBUG(("Channel Key packet"));
1726 if (packet->flags & SILC_PACKET_FLAG_LIST)
1728 silc_server_channel_key(server, sock, packet);
1734 case SILC_PACKET_COMMAND:
1736 * Recived command. Processes the command request and allocates the
1737 * command context and calls the command.
1739 SILC_LOG_DEBUG(("Command packet"));
1740 if (packet->flags & SILC_PACKET_FLAG_LIST)
1742 silc_server_command_process(server, sock, packet);
1745 case SILC_PACKET_COMMAND_REPLY:
1747 * Received command reply packet. Received command reply to command. It
1748 * may be reply to command sent by us or reply to command sent by client
1749 * that we've routed further.
1751 SILC_LOG_DEBUG(("Command Reply packet"));
1752 if (packet->flags & SILC_PACKET_FLAG_LIST)
1754 silc_server_command_reply(server, sock, packet);
1758 * Private Message packets
1760 case SILC_PACKET_PRIVATE_MESSAGE:
1762 * Received private message packet. The packet is coming from either
1765 SILC_LOG_DEBUG(("Private Message packet"));
1766 if (packet->flags & SILC_PACKET_FLAG_LIST)
1768 silc_server_private_message(server, sock, packet);
1771 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1773 * Private message key packet.
1775 if (packet->flags & SILC_PACKET_FLAG_LIST)
1777 silc_server_private_message_key(server, sock, packet);
1781 * Key Exchange protocol packets
1783 case SILC_PACKET_KEY_EXCHANGE:
1784 SILC_LOG_DEBUG(("KE packet"));
1785 if (packet->flags & SILC_PACKET_FLAG_LIST)
1788 if (sock->protocol && sock->protocol->protocol &&
1789 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1791 SilcServerKEInternalContext *proto_ctx =
1792 (SilcServerKEInternalContext *)sock->protocol->context;
1794 proto_ctx->packet = silc_packet_context_dup(packet);
1796 /* Let the protocol handle the packet */
1797 silc_protocol_execute(sock->protocol, server->timeout_queue, 0, 100000);
1799 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1800 "protocol active, packet dropped."));
1802 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1806 case SILC_PACKET_KEY_EXCHANGE_1:
1807 SILC_LOG_DEBUG(("KE 1 packet"));
1808 if (packet->flags & SILC_PACKET_FLAG_LIST)
1811 if (sock->protocol && sock->protocol->protocol &&
1812 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1813 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1815 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1816 SilcServerRekeyInternalContext *proto_ctx =
1817 (SilcServerRekeyInternalContext *)sock->protocol->context;
1819 if (proto_ctx->packet)
1820 silc_packet_context_free(proto_ctx->packet);
1822 proto_ctx->packet = silc_packet_context_dup(packet);
1824 /* Let the protocol handle the packet */
1825 silc_protocol_execute(sock->protocol, server->timeout_queue, 0, 0);
1827 SilcServerKEInternalContext *proto_ctx =
1828 (SilcServerKEInternalContext *)sock->protocol->context;
1830 if (proto_ctx->packet)
1831 silc_packet_context_free(proto_ctx->packet);
1833 proto_ctx->packet = silc_packet_context_dup(packet);
1834 proto_ctx->dest_id_type = packet->src_id_type;
1835 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1836 packet->src_id_type);
1837 if (!proto_ctx->dest_id)
1840 /* Let the protocol handle the packet */
1841 silc_protocol_execute(sock->protocol, server->timeout_queue,
1845 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1846 "protocol active, packet dropped."));
1850 case SILC_PACKET_KEY_EXCHANGE_2:
1851 SILC_LOG_DEBUG(("KE 2 packet"));
1852 if (packet->flags & SILC_PACKET_FLAG_LIST)
1855 if (sock->protocol && sock->protocol->protocol &&
1856 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1857 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1859 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1860 SilcServerRekeyInternalContext *proto_ctx =
1861 (SilcServerRekeyInternalContext *)sock->protocol->context;
1863 if (proto_ctx->packet)
1864 silc_packet_context_free(proto_ctx->packet);
1866 proto_ctx->packet = silc_packet_context_dup(packet);
1868 /* Let the protocol handle the packet */
1869 silc_protocol_execute(sock->protocol, server->timeout_queue, 0, 0);
1871 SilcServerKEInternalContext *proto_ctx =
1872 (SilcServerKEInternalContext *)sock->protocol->context;
1874 if (proto_ctx->packet)
1875 silc_packet_context_free(proto_ctx->packet);
1877 proto_ctx->packet = silc_packet_context_dup(packet);
1878 proto_ctx->dest_id_type = packet->src_id_type;
1879 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1880 packet->src_id_type);
1881 if (!proto_ctx->dest_id)
1884 /* Let the protocol handle the packet */
1885 silc_protocol_execute(sock->protocol, server->timeout_queue,
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 silc_protocol_execute(sock->protocol, server->timeout_queue, 0, 0);
1928 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1929 "protocol active, packet dropped."));
1933 case SILC_PACKET_NEW_ID:
1935 * Received New ID packet. This includes some new ID that has been
1936 * created. It may be for client, server or channel. This is the way
1937 * to distribute information about new registered entities in the
1940 SILC_LOG_DEBUG(("New ID packet"));
1941 if (packet->flags & SILC_PACKET_FLAG_LIST)
1942 silc_server_new_id_list(server, sock, packet);
1944 silc_server_new_id(server, sock, packet);
1947 case SILC_PACKET_NEW_CLIENT:
1949 * Received new client packet. This includes client information that
1950 * we will use to create initial client ID. After creating new
1951 * ID we will send it to the client.
1953 SILC_LOG_DEBUG(("New Client packet"));
1954 if (packet->flags & SILC_PACKET_FLAG_LIST)
1956 silc_server_new_client(server, sock, packet);
1959 case SILC_PACKET_NEW_SERVER:
1961 * Received new server packet. This includes Server ID and some other
1962 * information that we may save. This is received after server has
1965 SILC_LOG_DEBUG(("New Server packet"));
1966 if (packet->flags & SILC_PACKET_FLAG_LIST)
1968 silc_server_new_server(server, sock, packet);
1971 case SILC_PACKET_NEW_CHANNEL:
1973 * Received new channel packet. Information about new channel in the
1974 * network are distributed using this packet.
1976 SILC_LOG_DEBUG(("New Channel packet"));
1977 if (packet->flags & SILC_PACKET_FLAG_LIST)
1978 silc_server_new_channel_list(server, sock, packet);
1980 silc_server_new_channel(server, sock, packet);
1983 case SILC_PACKET_HEARTBEAT:
1985 * Received heartbeat.
1987 SILC_LOG_DEBUG(("Heartbeat packet"));
1988 if (packet->flags & SILC_PACKET_FLAG_LIST)
1992 case SILC_PACKET_KEY_AGREEMENT:
1994 * Received heartbeat.
1996 SILC_LOG_DEBUG(("Key agreement packet"));
1997 if (packet->flags & SILC_PACKET_FLAG_LIST)
1999 silc_server_key_agreement(server, sock, packet);
2002 case SILC_PACKET_REKEY:
2004 * Received re-key packet. The sender wants to regenerate the session
2007 SILC_LOG_DEBUG(("Re-key packet"));
2008 if (packet->flags & SILC_PACKET_FLAG_LIST)
2010 silc_server_rekey(server, sock, packet);
2013 case SILC_PACKET_REKEY_DONE:
2015 * The re-key is done.
2017 SILC_LOG_DEBUG(("Re-key done packet"));
2018 if (packet->flags & SILC_PACKET_FLAG_LIST)
2021 if (sock->protocol && sock->protocol->protocol &&
2022 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2024 SilcServerRekeyInternalContext *proto_ctx =
2025 (SilcServerRekeyInternalContext *)sock->protocol->context;
2027 if (proto_ctx->packet)
2028 silc_packet_context_free(proto_ctx->packet);
2030 proto_ctx->packet = silc_packet_context_dup(packet);
2032 /* Let the protocol handle the packet */
2033 silc_protocol_execute(sock->protocol, server->timeout_queue, 0, 0);
2035 SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2036 "protocol active, packet dropped."));
2041 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2047 /* Creates connection to a remote router. */
2049 void silc_server_create_connection(SilcServer server,
2050 char *remote_host, uint32 port)
2052 SilcServerConnection sconn;
2054 /* Allocate connection object for hold connection specific stuff. */
2055 sconn = silc_calloc(1, sizeof(*sconn));
2056 sconn->server = server;
2057 sconn->remote_host = strdup(remote_host);
2058 sconn->remote_port = port;
2060 silc_task_register(server->timeout_queue, 0,
2061 silc_server_connect_router,
2062 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2063 SILC_TASK_PRI_NORMAL);
2066 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2068 silc_socket_free((SilcSocketConnection)context);
2071 /* Closes connection to socket connection */
2073 void silc_server_close_connection(SilcServer server,
2074 SilcSocketConnection sock)
2076 SILC_LOG_INFO(("Closing connection %s:%d [%s] (%d)", sock->hostname,
2078 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2079 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2080 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2081 "Router"), sock->sock));
2083 /* We won't listen for this connection anymore */
2084 silc_schedule_unset_listen_fd(sock->sock);
2086 /* Unregister all tasks */
2087 silc_task_unregister_by_fd(server->io_queue, sock->sock);
2088 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
2090 /* Close the actual connection */
2091 silc_net_close_connection(sock->sock);
2092 server->sockets[sock->sock] = NULL;
2094 silc_task_register(server->timeout_queue, 0,
2095 silc_server_close_connection_final,
2096 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2097 SILC_TASK_PRI_NORMAL);
2100 /* Sends disconnect message to remote connection and disconnects the
2103 void silc_server_disconnect_remote(SilcServer server,
2104 SilcSocketConnection sock,
2105 const char *fmt, ...)
2108 unsigned char buf[4096];
2113 memset(buf, 0, sizeof(buf));
2115 vsprintf(buf, fmt, ap);
2118 SILC_LOG_DEBUG(("Disconnecting remote host"));
2120 SILC_LOG_INFO(("Disconnecting %s:%d [%s]", sock->hostname,
2122 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2123 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2124 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2127 /* Notify remote end that the conversation is over. The notify message
2128 is tried to be sent immediately. */
2129 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
2130 buf, strlen(buf), TRUE);
2132 /* Mark the connection to be disconnected */
2133 SILC_SET_DISCONNECTED(sock);
2134 silc_server_close_connection(server, sock);
2139 SilcClientEntry client;
2140 } *FreeClientInternal;
2142 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2144 FreeClientInternal i = (FreeClientInternal)context;
2146 silc_idlist_del_data(i->client);
2147 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2151 /* Frees client data and notifies about client's signoff. */
2153 void silc_server_free_client_data(SilcServer server,
2154 SilcSocketConnection sock,
2155 SilcClientEntry client,
2159 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2161 /* If there is pending outgoing data for the client then purge it
2162 to the network before removing the client entry. */
2163 if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
2164 (SILC_IS_DISCONNECTED(sock) == FALSE)) {
2165 server->stat.packets_sent++;
2167 if (sock->outbuf->data - sock->outbuf->head)
2168 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
2170 silc_packet_send(sock, TRUE);
2172 SILC_SET_CONNECTION_FOR_INPUT(sock->sock);
2173 SILC_UNSET_OUTBUF_PENDING(sock);
2174 silc_buffer_clear(sock->outbuf);
2177 /* Send SIGNOFF notify to routers. */
2178 if (notify && !server->standalone && server->router)
2179 silc_server_send_notify_signoff(server, server->router->connection,
2180 server->server_type == SILC_SERVER ?
2181 FALSE : TRUE, client->id, signoff);
2183 /* Remove client from all channels */
2185 silc_server_remove_from_channels(server, NULL, client,
2186 TRUE, signoff, TRUE);
2188 silc_server_remove_from_channels(server, NULL, client,
2189 FALSE, NULL, FALSE);
2191 /* We will not delete the client entry right away. We will take it
2192 into history (for WHOWAS command) for 5 minutes */
2195 silc_task_register(server->timeout_queue, 0,
2196 silc_server_free_client_data_timeout,
2198 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2199 client->data.registered = FALSE;
2201 /* Free the client entry and everything in it */
2202 server->stat.my_clients--;
2203 server->stat.clients--;
2204 if (server->server_type == SILC_ROUTER)
2205 server->stat.cell_clients--;
2208 /* Frees user_data pointer from socket connection object. This also sends
2209 appropriate notify packets to the network to inform about leaving
2212 void silc_server_free_sock_user_data(SilcServer server,
2213 SilcSocketConnection sock)
2215 SILC_LOG_DEBUG(("Start"));
2217 switch(sock->type) {
2218 case SILC_SOCKET_TYPE_CLIENT:
2220 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2221 silc_server_free_client_data(server, sock, user_data, TRUE, NULL);
2224 case SILC_SOCKET_TYPE_SERVER:
2225 case SILC_SOCKET_TYPE_ROUTER:
2227 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2229 /* Free all client entries that this server owns as they will
2230 become invalid now as well. */
2232 silc_server_remove_clients_by_server(server, user_data, TRUE);
2234 /* If this was our primary router connection then we're lost to
2235 the outside world. */
2236 if (server->router == user_data) {
2237 server->id_entry->router = NULL;
2238 server->router = NULL;
2239 server->standalone = TRUE;
2242 /* Free the server entry */
2243 silc_idlist_del_data(user_data);
2244 silc_idlist_del_server(server->local_list, user_data);
2245 server->stat.my_servers--;
2246 server->stat.servers--;
2247 if (server->server_type == SILC_ROUTER)
2248 server->stat.cell_servers--;
2253 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2255 silc_idlist_del_data(user_data);
2256 silc_free(user_data);
2261 sock->user_data = NULL;
2264 /* This function is used to remove all client entries by the server `entry'.
2265 This is called when the connection is lost to the server. In this case
2266 we must invalidate all the client entries owned by the server `entry'.
2267 If the `server_signoff' is TRUE then the SERVER_SIGNOFF notify is
2268 distributed to our local clients. */
2270 int silc_server_remove_clients_by_server(SilcServer server,
2271 SilcServerEntry entry,
2274 SilcIDCacheList list = NULL;
2275 SilcIDCacheEntry id_cache = NULL;
2276 SilcClientEntry client = NULL;
2278 SilcClientEntry *clients = NULL;
2279 uint32 clients_c = 0;
2280 unsigned char **argv = NULL;
2281 uint32 *argv_lens = NULL, *argv_types = NULL, argc = 0;
2284 SILC_LOG_DEBUG(("Start"));
2286 if (server_signoff) {
2287 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2288 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2289 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) * (argc + 1));
2290 argv_types = silc_realloc(argv_types, sizeof(*argv_types) * (argc + 1));
2291 argv[argc] = idp->data;
2292 argv_lens[argc] = idp->len;
2293 argv_types[argc] = argc + 1;
2295 silc_buffer_free(idp);
2298 if (silc_idcache_get_all(server->local_list->clients, &list)) {
2300 if (silc_idcache_list_first(list, &id_cache)) {
2302 client = (SilcClientEntry)id_cache->context;
2303 if (client->data.registered == FALSE) {
2304 if (!silc_idcache_list_next(list, &id_cache))
2310 if (client->router != entry) {
2311 if (server_signoff && client->connection) {
2312 clients = silc_realloc(clients,
2313 sizeof(*clients) * (clients_c + 1));
2314 clients[clients_c] = client;
2318 if (!silc_idcache_list_next(list, &id_cache))
2324 if (server_signoff) {
2325 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2326 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2327 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2329 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2331 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2332 memcpy(argv[argc], idp->data, idp->len);
2333 argv_lens[argc] = idp->len;
2334 argv_types[argc] = argc + 1;
2336 silc_buffer_free(idp);
2339 /* Remove the client entry */
2340 silc_server_remove_from_channels(server, NULL, client, FALSE,
2342 silc_idlist_del_client(server->local_list, client);
2344 if (!silc_idcache_list_next(list, &id_cache))
2348 silc_idcache_list_free(list);
2351 if (silc_idcache_get_all(server->global_list->clients, &list)) {
2353 if (silc_idcache_list_first(list, &id_cache)) {
2355 client = (SilcClientEntry)id_cache->context;
2356 if (client->data.registered == FALSE) {
2357 if (!silc_idcache_list_next(list, &id_cache))
2363 if (client->router != entry) {
2364 if (server_signoff && client->connection) {
2365 clients = silc_realloc(clients,
2366 sizeof(*clients) * (clients_c + 1));
2367 clients[clients_c] = client;
2371 if (!silc_idcache_list_next(list, &id_cache))
2377 if (server_signoff) {
2378 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2379 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2380 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2382 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2384 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2385 memcpy(argv[argc], idp->data, idp->len);
2386 argv_lens[argc] = idp->len;
2387 argv_types[argc] = argc + 1;
2389 silc_buffer_free(idp);
2392 /* Remove the client entry */
2393 silc_server_remove_from_channels(server, NULL, client, FALSE,
2395 silc_idlist_del_client(server->global_list, client);
2397 if (!silc_idcache_list_next(list, &id_cache))
2401 silc_idcache_list_free(list);
2404 /* Send the SERVER_SIGNOFF notify */
2405 if (server_signoff) {
2408 /* Send SERVER_SIGNOFF notify to our primary router */
2409 if (!server->standalone && server->router &&
2410 server->router != entry) {
2411 args = silc_argument_payload_encode(1, argv, argv_lens,
2413 silc_server_send_notify_args(server,
2414 server->router->connection,
2415 server->server_type == SILC_SERVER ?
2417 SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2419 silc_buffer_free(args);
2422 args = silc_argument_payload_encode(argc, argv, argv_lens,
2424 /* Send to local clients */
2425 for (i = 0; i < clients_c; i++) {
2426 silc_server_send_notify_args(server, clients[i]->connection,
2427 FALSE, SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2432 silc_buffer_free(args);
2434 silc_free(argv_lens);
2435 silc_free(argv_types);
2441 /* Checks whether given channel has global users. If it does this returns
2442 TRUE and FALSE if there is only locally connected clients on the channel. */
2444 int silc_server_channel_has_global(SilcChannelEntry channel)
2446 SilcChannelClientEntry chl;
2447 SilcHashTableList htl;
2449 silc_hash_table_list(channel->user_list, &htl);
2450 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2451 if (chl->client->router)
2458 /* Checks whether given channel has locally connected users. If it does this
2459 returns TRUE and FALSE if there is not one locally connected client. */
2461 int silc_server_channel_has_local(SilcChannelEntry channel)
2463 SilcChannelClientEntry chl;
2464 SilcHashTableList htl;
2466 silc_hash_table_list(channel->user_list, &htl);
2467 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2468 if (!chl->client->router)
2475 /* Removes client from all channels it has joined. This is used when client
2476 connection is disconnected. If the client on a channel is last, the
2477 channel is removed as well. This sends the SIGNOFF notify types. */
2479 void silc_server_remove_from_channels(SilcServer server,
2480 SilcSocketConnection sock,
2481 SilcClientEntry client,
2483 char *signoff_message,
2486 SilcChannelEntry channel;
2487 SilcChannelClientEntry chl;
2488 SilcHashTableList htl;
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_hash_table_list(client->channels, &htl);
2501 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2502 channel = chl->channel;
2504 /* Remove channel from client's channel list */
2505 silc_hash_table_del(client->channels, channel);
2507 /* Remove channel if there is no users anymore */
2508 if (server->server_type == SILC_ROUTER &&
2509 silc_hash_table_count(channel->user_list) < 2) {
2511 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2512 if (!silc_idlist_del_channel(server->local_list, channel))
2513 silc_idlist_del_channel(server->global_list, channel);
2514 server->stat.my_channels--;
2518 /* Remove client from channel's client list */
2519 silc_hash_table_del(channel->user_list, chl->client);
2521 server->stat.my_chanclients--;
2523 /* If there is no global users on the channel anymore mark the channel
2524 as local channel. */
2525 if (server->server_type == SILC_SERVER &&
2526 !silc_server_channel_has_global(channel))
2527 channel->global_users = FALSE;
2529 /* If there is not at least one local user on the channel then we don't
2530 need the channel entry anymore, we can remove it safely. */
2531 if (server->server_type == SILC_SERVER &&
2532 !silc_server_channel_has_local(channel)) {
2533 /* Notify about leaving client if this channel has global users. */
2534 if (notify && channel->global_users)
2535 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2536 SILC_NOTIFY_TYPE_SIGNOFF,
2537 signoff_message ? 2 : 1,
2538 clidp->data, clidp->len,
2539 signoff_message, signoff_message ?
2540 strlen(signoff_message) : 0);
2543 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2545 if (channel->founder_key) {
2546 /* The founder auth data exists, do not remove the channel entry */
2547 SilcChannelClientEntry chl2;
2548 SilcHashTableList htl2;
2552 silc_hash_table_list(channel->user_list, &htl2);
2553 while (silc_hash_table_get(&htl2, NULL, (void *)&chl2)) {
2554 silc_hash_table_del(chl2->client->channels, channel);
2555 silc_hash_table_del(channel->user_list, chl2->client);
2561 /* Remove the channel entry */
2562 if (!silc_idlist_del_channel(server->local_list, channel))
2563 silc_idlist_del_channel(server->global_list, channel);
2564 server->stat.my_channels--;
2568 /* Send notify to channel about client leaving SILC and thus
2569 the entire channel. */
2571 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2572 SILC_NOTIFY_TYPE_SIGNOFF,
2573 signoff_message ? 2 : 1,
2574 clidp->data, clidp->len,
2575 signoff_message, signoff_message ?
2576 strlen(signoff_message) : 0);
2578 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2579 /* Re-generate channel key */
2580 silc_server_create_channel_key(server, channel, 0);
2582 /* Send the channel key to the channel. The key of course is not sent
2583 to the client who was removed from the channel. */
2584 silc_server_send_channel_key(server, client->connection, channel,
2585 server->server_type == SILC_ROUTER ?
2586 FALSE : !server->standalone);
2590 silc_buffer_free(clidp);
2593 /* Removes client from one channel. This is used for example when client
2594 calls LEAVE command to remove itself from the channel. Returns TRUE
2595 if channel still exists and FALSE if the channel is removed when
2596 last client leaves the channel. If `notify' is FALSE notify messages
2599 int silc_server_remove_from_one_channel(SilcServer server,
2600 SilcSocketConnection sock,
2601 SilcChannelEntry channel,
2602 SilcClientEntry client,
2605 SilcChannelClientEntry chl;
2608 SILC_LOG_DEBUG(("Start"));
2610 /* Get the entry to the channel, if this client is not on the channel
2612 if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
2615 /* Remove the client from the channel. The client is removed from
2616 the channel's user list. */
2618 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2620 /* Remove channel from client's channel list */
2621 silc_hash_table_del(client->channels, chl->channel);
2623 /* Remove channel if there is no users anymore */
2624 if (server->server_type == SILC_ROUTER &&
2625 silc_hash_table_count(channel->user_list) < 2) {
2627 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2628 if (!silc_idlist_del_channel(server->local_list, channel))
2629 silc_idlist_del_channel(server->global_list, channel);
2630 silc_buffer_free(clidp);
2631 server->stat.my_channels--;
2635 /* Remove client from channel's client list */
2636 silc_hash_table_del(channel->user_list, chl->client);
2638 server->stat.my_chanclients--;
2640 /* If there is no global users on the channel anymore mark the channel
2641 as local channel. */
2642 if (server->server_type == SILC_SERVER &&
2643 !silc_server_channel_has_global(channel))
2644 channel->global_users = FALSE;
2646 /* If there is not at least one local user on the channel then we don't
2647 need the channel entry anymore, we can remove it safely. */
2648 if (server->server_type == SILC_SERVER &&
2649 !silc_server_channel_has_local(channel)) {
2650 /* Notify about leaving client if this channel has global users. */
2651 if (notify && channel->global_users)
2652 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2653 SILC_NOTIFY_TYPE_LEAVE, 1,
2654 clidp->data, clidp->len);
2656 silc_buffer_free(clidp);
2659 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2661 if (channel->founder_key) {
2662 /* The founder auth data exists, do not remove the channel entry */
2663 SilcChannelClientEntry chl2;
2664 SilcHashTableList htl2;
2668 silc_hash_table_list(channel->user_list, &htl2);
2669 while (silc_hash_table_get(&htl2, NULL, (void *)&chl2)) {
2670 silc_hash_table_del(chl2->client->channels, channel);
2671 silc_hash_table_del(channel->user_list, chl2->client);
2677 /* Remove the channel entry */
2678 if (!silc_idlist_del_channel(server->local_list, channel))
2679 silc_idlist_del_channel(server->global_list, channel);
2680 server->stat.my_channels--;
2684 /* Send notify to channel about client leaving the channel */
2686 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2687 SILC_NOTIFY_TYPE_LEAVE, 1,
2688 clidp->data, clidp->len);
2690 silc_buffer_free(clidp);
2694 /* Returns TRUE if the given client is on the channel. FALSE if not.
2695 This works because we assure that the user list on the channel is
2696 always in up to date thus we can only check the channel list from
2697 `client' which is faster than checking the user list from `channel'. */
2699 int silc_server_client_on_channel(SilcClientEntry client,
2700 SilcChannelEntry channel)
2702 if (!client || !channel)
2705 if (silc_hash_table_find(client->channels, channel, NULL, NULL))
2711 /* Timeout callback. This is called if connection is idle or for some
2712 other reason is not responding within some period of time. This
2713 disconnects the remote end. */
2715 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2717 SilcServer server = (SilcServer)context;
2718 SilcSocketConnection sock = server->sockets[fd];
2720 SILC_LOG_DEBUG(("Start"));
2725 /* If we have protocol active we must assure that we call the protocol's
2726 final callback so that all the memory is freed. */
2727 if (sock->protocol) {
2728 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2729 silc_protocol_execute_final(sock->protocol, server->timeout_queue);
2733 if (sock->user_data)
2734 silc_server_free_sock_user_data(server, sock);
2736 silc_server_disconnect_remote(server, sock, "Server closed connection: "
2737 "Connection timeout");
2740 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2741 function may be used only by router. In real SILC network all channels
2742 are created by routers thus this function is never used by normal
2745 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2746 SilcServerID *router_id,
2752 SilcChannelID *channel_id;
2753 SilcChannelEntry entry;
2757 SILC_LOG_DEBUG(("Creating new channel"));
2760 cipher = "aes-256-cbc";
2762 hmac = "hmac-sha1-96";
2764 /* Allocate cipher */
2765 if (!silc_cipher_alloc(cipher, &key))
2769 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2770 silc_cipher_free(key);
2774 channel_name = strdup(channel_name);
2776 /* Create the channel */
2777 silc_id_create_channel_id(router_id, server->rng, &channel_id);
2778 entry = silc_idlist_add_channel(server->local_list, channel_name,
2779 SILC_CHANNEL_MODE_NONE, channel_id,
2780 NULL, key, newhmac);
2782 silc_free(channel_name);
2783 silc_cipher_free(key);
2784 silc_hmac_free(newhmac);
2788 entry->cipher = strdup(cipher);
2789 entry->hmac_name = strdup(hmac);
2791 /* Now create the actual key material */
2792 silc_server_create_channel_key(server, entry,
2793 silc_cipher_get_key_len(key) / 8);
2795 /* Notify other routers about the new channel. We send the packet
2796 to our primary route. */
2797 if (broadcast && server->standalone == FALSE)
2798 silc_server_send_new_channel(server, server->router->connection, TRUE,
2799 channel_name, entry->id,
2800 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
2803 server->stat.my_channels++;
2808 /* Same as above but creates the channel with Channel ID `channel_id. */
2811 silc_server_create_new_channel_with_id(SilcServer server,
2815 SilcChannelID *channel_id,
2818 SilcChannelEntry entry;
2822 SILC_LOG_DEBUG(("Creating new channel"));
2825 cipher = "aes-256-cbc";
2827 hmac = "hmac-sha1-96";
2829 /* Allocate cipher */
2830 if (!silc_cipher_alloc(cipher, &key))
2834 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2835 silc_cipher_free(key);
2839 channel_name = strdup(channel_name);
2841 /* Create the channel */
2842 entry = silc_idlist_add_channel(server->local_list, channel_name,
2843 SILC_CHANNEL_MODE_NONE, channel_id,
2844 NULL, key, newhmac);
2846 silc_free(channel_name);
2850 /* Now create the actual key material */
2851 silc_server_create_channel_key(server, entry,
2852 silc_cipher_get_key_len(key) / 8);
2854 /* Notify other routers about the new channel. We send the packet
2855 to our primary route. */
2856 if (broadcast && server->standalone == FALSE)
2857 silc_server_send_new_channel(server, server->router->connection, TRUE,
2858 channel_name, entry->id,
2859 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
2862 server->stat.my_channels++;
2867 /* Channel's key re-key timeout callback. */
2869 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
2871 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
2872 SilcServer server = (SilcServer)rekey->context;
2874 silc_server_create_channel_key(server, rekey->channel, rekey->key_len);
2875 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
2877 silc_task_register(server->timeout_queue, 0,
2878 silc_server_channel_key_rekey,
2879 (void *)rekey, 3600, 0,
2881 SILC_TASK_PRI_NORMAL);
2884 /* Generates new channel key. This is used to create the initial channel key
2885 but also to re-generate new key for channel. If `key_len' is provided
2886 it is the bytes of the key length. */
2888 void silc_server_create_channel_key(SilcServer server,
2889 SilcChannelEntry channel,
2893 unsigned char channel_key[32], hash[32];
2896 SILC_LOG_DEBUG(("Generating channel key"));
2898 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
2899 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
2903 if (!channel->channel_key)
2904 if (!silc_cipher_alloc("aes-256-cbc", &channel->channel_key))
2909 else if (channel->key_len)
2910 len = channel->key_len / 8;
2912 len = silc_cipher_get_key_len(channel->channel_key) / 8;
2914 /* Create channel key */
2915 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
2918 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
2920 /* Remove old key if exists */
2922 memset(channel->key, 0, channel->key_len / 8);
2923 silc_free(channel->key);
2927 channel->key_len = len * 8;
2928 channel->key = silc_calloc(len, sizeof(*channel->key));
2929 memcpy(channel->key, channel_key, len);
2930 memset(channel_key, 0, sizeof(channel_key));
2932 /* Generate HMAC key from the channel key data and set it */
2934 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2935 silc_hash_make(channel->hmac->hash, channel->key, len, hash);
2936 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2937 memset(hash, 0, sizeof(hash));
2939 if (server->server_type == SILC_ROUTER) {
2940 if (!channel->rekey)
2941 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
2942 channel->rekey->context = (void *)server;
2943 channel->rekey->channel = channel;
2944 channel->rekey->key_len = key_len;
2946 silc_task_unregister_by_callback(server->timeout_queue,
2947 silc_server_channel_key_rekey);
2948 silc_task_register(server->timeout_queue, 0,
2949 silc_server_channel_key_rekey,
2950 (void *)channel->rekey, 3600, 0,
2952 SILC_TASK_PRI_NORMAL);
2956 /* Saves the channel key found in the encoded `key_payload' buffer. This
2957 function is used when we receive Channel Key Payload and also when we're
2958 processing JOIN command reply. Returns entry to the channel. */
2960 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
2961 SilcBuffer key_payload,
2962 SilcChannelEntry channel)
2964 SilcChannelKeyPayload payload = NULL;
2965 SilcChannelID *id = NULL;
2966 unsigned char *tmp, hash[32];
2970 SILC_LOG_DEBUG(("Start"));
2972 /* Decode channel key payload */
2973 payload = silc_channel_key_payload_parse(key_payload);
2975 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
2980 /* Get the channel entry */
2983 /* Get channel ID */
2984 tmp = silc_channel_key_get_id(payload, &tmp_len);
2985 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
2991 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
2993 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
2995 SILC_LOG_ERROR(("Received key for non-existent channel"));
3001 tmp = silc_channel_key_get_key(payload, &tmp_len);
3007 cipher = silc_channel_key_get_cipher(payload, NULL);
3013 /* Remove old key if exists */
3015 memset(channel->key, 0, channel->key_len / 8);
3016 silc_free(channel->key);
3017 silc_cipher_free(channel->channel_key);
3020 /* Create new cipher */
3021 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3026 if (channel->cipher)
3027 silc_free(channel->cipher);
3028 channel->cipher = strdup(cipher);
3031 channel->key_len = tmp_len * 8;
3032 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
3033 memcpy(channel->key, tmp, tmp_len);
3034 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3036 /* Generate HMAC key from the channel key data and set it */
3038 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
3039 silc_hash_make(channel->hmac->hash, tmp, tmp_len, hash);
3040 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
3042 memset(hash, 0, sizeof(hash));
3043 memset(tmp, 0, tmp_len);
3045 if (server->server_type == SILC_ROUTER) {
3046 if (!channel->rekey)
3047 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3048 channel->rekey->context = (void *)server;
3049 channel->rekey->channel = channel;
3051 silc_task_unregister_by_callback(server->timeout_queue,
3052 silc_server_channel_key_rekey);
3053 silc_task_register(server->timeout_queue, 0,
3054 silc_server_channel_key_rekey,
3055 (void *)channel->rekey, 3600, 0,
3057 SILC_TASK_PRI_NORMAL);
3064 silc_channel_key_payload_free(payload);
3069 /* Heartbeat callback. This function is set as argument for the
3070 silc_socket_set_heartbeat function. The library will call this function
3071 at the set time interval. */
3073 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3076 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
3078 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname,
3081 /* Send the heartbeat */
3082 silc_server_send_heartbeat(hb->server, sock);
3085 /* Returns assembled of all servers in the given ID list. The packet's
3086 form is dictated by the New ID payload. */
3088 static void silc_server_announce_get_servers(SilcServer server,
3090 SilcBuffer *servers)
3092 SilcIDCacheList list;
3093 SilcIDCacheEntry id_cache;
3094 SilcServerEntry entry;
3097 /* Go through all clients in the list */
3098 if (silc_idcache_get_all(id_list->servers, &list)) {
3099 if (silc_idcache_list_first(list, &id_cache)) {
3101 entry = (SilcServerEntry)id_cache->context;
3103 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3105 *servers = silc_buffer_realloc(*servers,
3107 (*servers)->truelen + idp->len :
3109 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3110 silc_buffer_put(*servers, idp->data, idp->len);
3111 silc_buffer_pull(*servers, idp->len);
3112 silc_buffer_free(idp);
3114 if (!silc_idcache_list_next(list, &id_cache))
3119 silc_idcache_list_free(list);
3123 /* This function is used by router to announce existing servers to our
3124 primary router when we've connected to it. */
3126 void silc_server_announce_servers(SilcServer server)
3128 SilcBuffer servers = NULL;
3130 SILC_LOG_DEBUG(("Announcing servers"));
3132 /* Get servers in local list */
3133 silc_server_announce_get_servers(server, server->local_list, &servers);
3135 /* Get servers in global list */
3136 silc_server_announce_get_servers(server, server->global_list, &servers);
3139 silc_buffer_push(servers, servers->data - servers->head);
3140 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3142 /* Send the packet */
3143 silc_server_packet_send(server, server->router->connection,
3144 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3145 servers->data, servers->len, TRUE);
3147 silc_buffer_free(servers);
3151 /* Returns assembled packet of all clients in the given ID list. The
3152 packet's form is dictated by the New ID Payload. */
3154 static void silc_server_announce_get_clients(SilcServer server,
3156 SilcBuffer *clients)
3158 SilcIDCacheList list;
3159 SilcIDCacheEntry id_cache;
3160 SilcClientEntry client;
3163 /* Go through all clients in the list */
3164 if (silc_idcache_get_all(id_list->clients, &list)) {
3165 if (silc_idcache_list_first(list, &id_cache)) {
3167 client = (SilcClientEntry)id_cache->context;
3169 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3171 *clients = silc_buffer_realloc(*clients,
3173 (*clients)->truelen + idp->len :
3175 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3176 silc_buffer_put(*clients, idp->data, idp->len);
3177 silc_buffer_pull(*clients, idp->len);
3178 silc_buffer_free(idp);
3180 if (!silc_idcache_list_next(list, &id_cache))
3185 silc_idcache_list_free(list);
3189 /* This function is used to announce our existing clients to our router
3190 when we've connected to it. */
3192 void silc_server_announce_clients(SilcServer server)
3194 SilcBuffer clients = NULL;
3196 SILC_LOG_DEBUG(("Announcing clients"));
3198 /* Get clients in local list */
3199 silc_server_announce_get_clients(server, server->local_list,
3202 /* As router we announce our global list as well */
3203 if (server->server_type == SILC_ROUTER)
3204 silc_server_announce_get_clients(server, server->global_list,
3208 silc_buffer_push(clients, clients->data - clients->head);
3209 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3211 /* Send the packet */
3212 silc_server_packet_send(server, server->router->connection,
3213 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3214 clients->data, clients->len, TRUE);
3216 silc_buffer_free(clients);
3221 silc_server_announce_encode_notify(SilcNotifyType notify, uint32 argc, ...)
3226 return silc_notify_payload_encode(notify, argc, ap);
3229 /* Returns assembled packets for channel users of the `channel'. */
3231 void silc_server_announce_get_channel_users(SilcServer server,
3232 SilcChannelEntry channel,
3233 SilcBuffer *channel_users,
3234 SilcBuffer *channel_users_modes)
3236 SilcChannelClientEntry chl;
3237 SilcHashTableList htl;
3238 SilcBuffer chidp, clidp;
3241 unsigned char mode[4];
3243 SILC_LOG_DEBUG(("Start"));
3245 /* Now find all users on the channel */
3246 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3247 silc_hash_table_list(channel->user_list, &htl);
3248 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3249 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3252 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
3253 clidp->data, clidp->len,
3254 chidp->data, chidp->len);
3257 silc_buffer_realloc(*channel_users,
3259 (*channel_users)->truelen + len : len));
3260 silc_buffer_pull_tail(*channel_users,
3261 ((*channel_users)->end -
3262 (*channel_users)->data));
3264 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3265 silc_buffer_pull(*channel_users, len);
3266 silc_buffer_free(tmp);
3268 /* CUMODE notify for mode change on the channel */
3269 SILC_PUT32_MSB(chl->mode, mode);
3270 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
3271 3, clidp->data, clidp->len,
3273 clidp->data, clidp->len);
3275 *channel_users_modes =
3276 silc_buffer_realloc(*channel_users_modes,
3277 (*channel_users_modes ?
3278 (*channel_users_modes)->truelen + len : len));
3279 silc_buffer_pull_tail(*channel_users_modes,
3280 ((*channel_users_modes)->end -
3281 (*channel_users_modes)->data));
3283 silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
3284 silc_buffer_pull(*channel_users_modes, len);
3285 silc_buffer_free(tmp);
3287 silc_buffer_free(clidp);
3289 silc_buffer_free(chidp);
3292 /* Returns assembled packets for all channels and users on those channels
3293 from the given ID List. The packets are in the form dictated by the
3294 New Channel and New Channel User payloads. */
3296 void silc_server_announce_get_channels(SilcServer server,
3298 SilcBuffer *channels,
3299 SilcBuffer *channel_users,
3300 SilcBuffer *channel_users_modes)
3302 SilcIDCacheList list;
3303 SilcIDCacheEntry id_cache;
3304 SilcChannelEntry channel;
3310 SILC_LOG_DEBUG(("Start"));
3312 /* Go through all channels in the list */
3313 if (silc_idcache_get_all(id_list->channels, &list)) {
3314 if (silc_idcache_list_first(list, &id_cache)) {
3316 channel = (SilcChannelEntry)id_cache->context;
3318 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3319 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3320 name_len = strlen(channel->channel_name);
3322 len = 4 + name_len + id_len + 4;
3324 silc_buffer_realloc(*channels,
3325 (*channels ? (*channels)->truelen + len : len));
3326 silc_buffer_pull_tail(*channels,
3327 ((*channels)->end - (*channels)->data));
3328 silc_buffer_format(*channels,
3329 SILC_STR_UI_SHORT(name_len),
3330 SILC_STR_UI_XNSTRING(channel->channel_name,
3332 SILC_STR_UI_SHORT(id_len),
3333 SILC_STR_UI_XNSTRING(cid, id_len),
3334 SILC_STR_UI_INT(channel->mode),
3336 silc_buffer_pull(*channels, len);
3338 silc_server_announce_get_channel_users(server, channel,
3340 channel_users_modes);
3344 if (!silc_idcache_list_next(list, &id_cache))
3349 silc_idcache_list_free(list);
3353 /* This function is used to announce our existing channels to our router
3354 when we've connected to it. This also announces the users on the
3355 channels to the router. */
3357 void silc_server_announce_channels(SilcServer server)
3359 SilcBuffer channels = NULL, channel_users = NULL, channel_users_modes = NULL;
3361 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3363 /* Get channels and channel users in local list */
3364 silc_server_announce_get_channels(server, server->local_list,
3365 &channels, &channel_users,
3366 &channel_users_modes);
3368 /* Get channels and channel users in global list */
3369 silc_server_announce_get_channels(server, server->global_list,
3370 &channels, &channel_users,
3371 &channel_users_modes);
3374 silc_buffer_push(channels, channels->data - channels->head);
3375 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3377 /* Send the packet */
3378 silc_server_packet_send(server, server->router->connection,
3379 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3380 channels->data, channels->len,
3383 silc_buffer_free(channels);
3386 if (channel_users) {
3387 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3388 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3389 channel_users->len);
3391 /* Send the packet */
3392 silc_server_packet_send(server, server->router->connection,
3393 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3394 channel_users->data, channel_users->len,
3397 silc_buffer_free(channel_users);
3400 if (channel_users_modes) {
3401 silc_buffer_push(channel_users_modes,
3402 channel_users_modes->data - channel_users_modes->head);
3403 SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes->data,
3404 channel_users_modes->len);
3406 /* Send the packet */
3407 silc_server_packet_send(server, server->router->connection,
3408 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3409 channel_users_modes->data,
3410 channel_users_modes->len,
3413 silc_buffer_free(channel_users_modes);
3417 /* Failure timeout callback. If this is called then we will immediately
3418 process the received failure. We always process the failure with timeout
3419 since we do not want to blindly trust to received failure packets.
3420 This won't be called (the timeout is cancelled) if the failure was
3421 bogus (it is bogus if remote does not close the connection after sending
3424 SILC_TASK_CALLBACK(silc_server_failure_callback)
3426 SilcServerFailureContext f = (SilcServerFailureContext)context;
3428 if (f->sock->protocol) {
3429 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3430 silc_protocol_execute(f->sock->protocol, f->server->timeout_queue, 0, 0);
3436 /* Assembles user list and users mode list from the `channel'. */
3438 void silc_server_get_users_on_channel(SilcServer server,
3439 SilcChannelEntry channel,
3440 SilcBuffer *user_list,
3441 SilcBuffer *mode_list,
3444 SilcChannelClientEntry chl;
3445 SilcHashTableList htl;
3446 SilcBuffer client_id_list;
3447 SilcBuffer client_mode_list;
3449 uint32 list_count = 0;
3451 /* XXX rewrite - this does not support IPv6 based Client ID's. */
3454 silc_buffer_alloc((SILC_ID_CLIENT_LEN + 4) *
3455 silc_hash_table_count(channel->user_list));
3457 silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
3458 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3459 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3460 silc_hash_table_list(channel->user_list, &htl);
3461 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3463 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3464 silc_buffer_put(client_id_list, idp->data, idp->len);
3465 silc_buffer_pull(client_id_list, idp->len);
3466 silc_buffer_free(idp);
3468 /* Client's mode on channel */
3469 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3470 silc_buffer_pull(client_mode_list, 4);
3474 silc_buffer_push(client_id_list,
3475 client_id_list->data - client_id_list->head);
3476 silc_buffer_push(client_mode_list,
3477 client_mode_list->data - client_mode_list->head);
3479 *user_list = client_id_list;
3480 *mode_list = client_mode_list;
3481 *user_count = list_count;
3484 /* Saves users and their modes to the `channel'. */
3486 void silc_server_save_users_on_channel(SilcServer server,
3487 SilcSocketConnection sock,
3488 SilcChannelEntry channel,
3489 SilcClientID *noadd,
3490 SilcBuffer user_list,
3491 SilcBuffer mode_list,
3496 /* Cache the received Client ID's and modes. This cache expires
3497 whenever server sends notify message to channel. It means two things;
3498 some user has joined or leaved the channel. XXX TODO! */
3499 for (i = 0; i < user_count; i++) {
3502 SilcClientID *client_id;
3503 SilcClientEntry client;
3506 SILC_GET16_MSB(idp_len, user_list->data + 2);
3508 client_id = silc_id_payload_parse_id(user_list->data, idp_len);
3509 silc_buffer_pull(user_list, idp_len);
3514 SILC_GET32_MSB(mode, mode_list->data);
3515 silc_buffer_pull(mode_list, 4);
3517 if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3518 silc_free(client_id);
3522 /* Check if we have this client cached already. */
3523 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3526 client = silc_idlist_find_client_by_id(server->global_list,
3529 /* If router did not find such Client ID in its lists then this must
3530 be bogus client or some router in the net is buggy. */
3531 if (server->server_type == SILC_ROUTER) {
3532 silc_free(client_id);
3536 /* We don't have that client anywhere, add it. The client is added
3537 to global list since server didn't have it in the lists so it must be
3539 client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
3540 silc_id_dup(client_id, SILC_ID_CLIENT),
3541 sock->user_data, NULL);
3543 silc_free(client_id);
3547 client->data.registered = TRUE;
3550 silc_free(client_id);
3552 if (!silc_server_client_on_channel(client, channel)) {
3553 /* Client was not on the channel, add it. */
3554 SilcChannelClientEntry chl = silc_calloc(1, sizeof(*chl));
3555 chl->client = client;
3557 chl->channel = channel;
3558 silc_hash_table_add(channel->user_list, chl->client, chl);
3559 silc_hash_table_add(client->channels, chl->channel, chl);
3564 /* Lookups route to the client indicated by the `id_data'. The connection
3565 object and internal data object is returned. Returns NULL if route
3566 could not be found to the client. If the `client_id' is specified then
3567 it is used and the `id_data' is ignored. */
3569 SilcSocketConnection silc_server_get_client_route(SilcServer server,
3570 unsigned char *id_data,
3572 SilcClientID *client_id,
3573 SilcIDListData *idata)
3576 SilcClientEntry client;
3578 SILC_LOG_DEBUG(("Start"));
3580 /* Decode destination Client ID */
3582 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
3584 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
3588 id = silc_id_dup(client_id, SILC_ID_CLIENT);
3591 /* If the destination belongs to our server we don't have to route
3592 the packet anywhere but to send it to the local destination. */
3593 client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
3597 if (client && client->data.registered == FALSE)
3600 /* If we are router and the client has router then the client is in
3601 our cell but not directly connected to us. */
3602 if (server->server_type == SILC_ROUTER && client->router) {
3603 /* We are of course in this case the client's router thus the real
3604 "router" of the client is the server who owns the client. Thus
3605 we will send the packet to that server. */
3607 *idata = (SilcIDListData)client->router;
3608 return client->router->connection;
3611 /* Seems that client really is directly connected to us */
3613 *idata = (SilcIDListData)client;
3614 return client->connection;
3617 /* Destination belongs to someone not in this server. If we are normal
3618 server our action is to send the packet to our router. */
3619 if (server->server_type == SILC_SERVER && !server->standalone) {
3622 *idata = (SilcIDListData)server->router;
3623 return server->router->connection;
3626 /* We are router and we will perform route lookup for the destination
3627 and send the packet to fastest route. */
3628 if (server->server_type == SILC_ROUTER && !server->standalone) {
3629 /* Check first that the ID is valid */
3630 client = silc_idlist_find_client_by_id(server->global_list, id, NULL);
3632 SilcSocketConnection dst_sock;
3634 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
3638 *idata = (SilcIDListData)dst_sock->user_data;
3647 /* Encodes and returns channel list of channels the `client' has joined.
3648 Secret channels are not put to the list. */
3650 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
3651 SilcClientEntry client)
3653 SilcBuffer buffer = NULL;
3654 SilcChannelEntry channel;
3655 SilcChannelClientEntry chl;
3656 SilcHashTableList htl;
3662 silc_hash_table_list(client->channels, &htl);
3663 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3664 channel = chl->channel;
3666 if (channel->mode & SILC_CHANNEL_MODE_SECRET)
3669 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3670 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3671 name_len = strlen(channel->channel_name);
3673 len = 4 + name_len + id_len + 4;
3674 buffer = silc_buffer_realloc(buffer,
3675 (buffer ? (buffer)->truelen + len : len));
3676 silc_buffer_pull_tail(buffer, ((buffer)->end - (buffer)->data));
3677 silc_buffer_format(buffer,
3678 SILC_STR_UI_SHORT(name_len),
3679 SILC_STR_UI_XNSTRING(channel->channel_name,
3681 SILC_STR_UI_SHORT(id_len),
3682 SILC_STR_UI_XNSTRING(cid, id_len),
3683 SILC_STR_UI_INT(chl->mode), /* Client's mode */
3685 silc_buffer_pull(buffer, len);
3690 silc_buffer_push(buffer, buffer->data - buffer->head);
3695 /* Finds client entry by Client ID and if it is not found then resolves
3696 it using WHOIS command. */
3698 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
3699 SilcClientID *client_id)
3701 SilcClientEntry client;
3703 client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL);
3705 client = silc_idlist_find_client_by_id(server->global_list,
3707 if (!client && server->server_type == SILC_ROUTER)
3711 if (!client && server->standalone)
3714 if (!client || !client->nickname || !client->username) {
3715 SilcBuffer buffer, idp;
3717 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
3718 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
3719 ++server->cmd_ident, 1,
3720 3, idp->data, idp->len);
3721 silc_server_packet_send(server, client ? client->router->connection :
3722 server->router->connection,
3723 SILC_PACKET_COMMAND, 0,
3724 buffer->data, buffer->len, FALSE);
3725 silc_buffer_free(idp);
3726 silc_buffer_free(buffer);
3732 /* A timeout callback for the re-key. We will be the initiator of the
3735 SILC_TASK_CALLBACK(silc_server_rekey_callback)
3737 SilcSocketConnection sock = (SilcSocketConnection)context;
3738 SilcIDListData idata = (SilcIDListData)sock->user_data;
3739 SilcServer server = (SilcServer)idata->rekey->context;
3740 SilcProtocol protocol;
3741 SilcServerRekeyInternalContext *proto_ctx;
3743 SILC_LOG_DEBUG(("Start"));
3745 /* Allocate internal protocol context. This is sent as context
3747 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
3748 proto_ctx->server = (void *)server;
3749 proto_ctx->sock = sock;
3750 proto_ctx->responder = FALSE;
3751 proto_ctx->pfs = idata->rekey->pfs;
3753 /* Perform rekey protocol. Will call the final callback after the
3754 protocol is over. */
3755 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
3756 &protocol, proto_ctx, silc_server_rekey_final);
3757 sock->protocol = protocol;
3759 /* Run the protocol */
3760 silc_protocol_execute(protocol, server->timeout_queue, 0, 0);
3762 /* Re-register re-key timeout */
3763 silc_task_register(server->timeout_queue, sock->sock,
3764 silc_server_rekey_callback,
3765 context, idata->rekey->timeout, 0,
3766 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
3769 /* The final callback for the REKEY protocol. This will actually take the
3770 new key material into use. */
3772 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
3774 SilcProtocol protocol = (SilcProtocol)context;
3775 SilcServerRekeyInternalContext *ctx =
3776 (SilcServerRekeyInternalContext *)protocol->context;
3777 SilcServer server = (SilcServer)ctx->server;
3778 SilcSocketConnection sock = ctx->sock;
3780 SILC_LOG_DEBUG(("Start"));
3782 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
3783 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
3784 /* Error occured during protocol */
3785 silc_protocol_cancel(protocol, server->timeout_queue);
3786 silc_protocol_free(protocol);
3787 sock->protocol = NULL;
3789 silc_packet_context_free(ctx->packet);
3791 silc_ske_free(ctx->ske);
3797 silc_protocol_free(protocol);
3798 sock->protocol = NULL;
3800 silc_packet_context_free(ctx->packet);
3802 silc_ske_free(ctx->ske);