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 /* If any protocol is active cancel its execution */
2084 if (sock->protocol) {
2085 silc_protocol_cancel(sock->protocol, server->timeout_queue);
2086 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2087 silc_protocol_execute_final(sock->protocol, server->timeout_queue);
2088 sock->protocol = NULL;
2091 /* We won't listen for this connection anymore */
2092 silc_schedule_unset_listen_fd(sock->sock);
2094 /* Unregister all tasks */
2095 silc_task_unregister_by_fd(server->io_queue, sock->sock);
2096 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
2098 /* Close the actual connection */
2099 silc_net_close_connection(sock->sock);
2100 server->sockets[sock->sock] = NULL;
2102 silc_task_register(server->timeout_queue, 0,
2103 silc_server_close_connection_final,
2104 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2105 SILC_TASK_PRI_NORMAL);
2108 /* Sends disconnect message to remote connection and disconnects the
2111 void silc_server_disconnect_remote(SilcServer server,
2112 SilcSocketConnection sock,
2113 const char *fmt, ...)
2116 unsigned char buf[4096];
2121 memset(buf, 0, sizeof(buf));
2123 vsprintf(buf, fmt, ap);
2126 SILC_LOG_DEBUG(("Disconnecting remote host"));
2128 SILC_LOG_INFO(("Disconnecting %s:%d [%s]", sock->hostname,
2130 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2131 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2132 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2135 /* Notify remote end that the conversation is over. The notify message
2136 is tried to be sent immediately. */
2137 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
2138 buf, strlen(buf), TRUE);
2140 /* Mark the connection to be disconnected */
2141 SILC_SET_DISCONNECTED(sock);
2142 silc_server_close_connection(server, sock);
2147 SilcClientEntry client;
2148 } *FreeClientInternal;
2150 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2152 FreeClientInternal i = (FreeClientInternal)context;
2154 silc_idlist_del_data(i->client);
2155 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2159 /* Frees client data and notifies about client's signoff. */
2161 void silc_server_free_client_data(SilcServer server,
2162 SilcSocketConnection sock,
2163 SilcClientEntry client,
2167 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2169 /* If there is pending outgoing data for the client then purge it
2170 to the network before removing the client entry. */
2171 if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
2172 (SILC_IS_DISCONNECTED(sock) == FALSE)) {
2173 server->stat.packets_sent++;
2175 if (sock->outbuf->data - sock->outbuf->head)
2176 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
2178 silc_packet_send(sock, TRUE);
2180 SILC_SET_CONNECTION_FOR_INPUT(sock->sock);
2181 SILC_UNSET_OUTBUF_PENDING(sock);
2182 silc_buffer_clear(sock->outbuf);
2185 /* Send SIGNOFF notify to routers. */
2186 if (notify && !server->standalone && server->router)
2187 silc_server_send_notify_signoff(server, server->router->connection,
2188 server->server_type == SILC_SERVER ?
2189 FALSE : TRUE, client->id, signoff);
2191 /* Remove client from all channels */
2193 silc_server_remove_from_channels(server, NULL, client,
2194 TRUE, signoff, TRUE);
2196 silc_server_remove_from_channels(server, NULL, client,
2197 FALSE, NULL, FALSE);
2199 /* We will not delete the client entry right away. We will take it
2200 into history (for WHOWAS command) for 5 minutes */
2203 silc_task_register(server->timeout_queue, 0,
2204 silc_server_free_client_data_timeout,
2206 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2207 client->data.registered = FALSE;
2209 /* Free the client entry and everything in it */
2210 server->stat.my_clients--;
2211 server->stat.clients--;
2212 if (server->server_type == SILC_ROUTER)
2213 server->stat.cell_clients--;
2216 /* Frees user_data pointer from socket connection object. This also sends
2217 appropriate notify packets to the network to inform about leaving
2220 void silc_server_free_sock_user_data(SilcServer server,
2221 SilcSocketConnection sock)
2223 SILC_LOG_DEBUG(("Start"));
2225 switch(sock->type) {
2226 case SILC_SOCKET_TYPE_CLIENT:
2228 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2229 silc_server_free_client_data(server, sock, user_data, TRUE, NULL);
2232 case SILC_SOCKET_TYPE_SERVER:
2233 case SILC_SOCKET_TYPE_ROUTER:
2235 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2237 /* Free all client entries that this server owns as they will
2238 become invalid now as well. */
2240 silc_server_remove_clients_by_server(server, user_data, TRUE);
2242 /* If this was our primary router connection then we're lost to
2243 the outside world. */
2244 if (server->router == user_data) {
2245 server->id_entry->router = NULL;
2246 server->router = NULL;
2247 server->standalone = TRUE;
2250 /* Free the server entry */
2251 silc_idlist_del_data(user_data);
2252 silc_idlist_del_server(server->local_list, user_data);
2253 server->stat.my_servers--;
2254 server->stat.servers--;
2255 if (server->server_type == SILC_ROUTER)
2256 server->stat.cell_servers--;
2261 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2263 silc_idlist_del_data(user_data);
2264 silc_free(user_data);
2269 sock->user_data = NULL;
2272 /* This function is used to remove all client entries by the server `entry'.
2273 This is called when the connection is lost to the server. In this case
2274 we must invalidate all the client entries owned by the server `entry'.
2275 If the `server_signoff' is TRUE then the SERVER_SIGNOFF notify is
2276 distributed to our local clients. */
2278 int silc_server_remove_clients_by_server(SilcServer server,
2279 SilcServerEntry entry,
2282 SilcIDCacheList list = NULL;
2283 SilcIDCacheEntry id_cache = NULL;
2284 SilcClientEntry client = NULL;
2286 SilcClientEntry *clients = NULL;
2287 uint32 clients_c = 0;
2288 unsigned char **argv = NULL;
2289 uint32 *argv_lens = NULL, *argv_types = NULL, argc = 0;
2292 SILC_LOG_DEBUG(("Start"));
2294 if (server_signoff) {
2295 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2296 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2297 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) * (argc + 1));
2298 argv_types = silc_realloc(argv_types, sizeof(*argv_types) * (argc + 1));
2299 argv[argc] = idp->data;
2300 argv_lens[argc] = idp->len;
2301 argv_types[argc] = argc + 1;
2303 silc_buffer_free(idp);
2306 if (silc_idcache_get_all(server->local_list->clients, &list)) {
2308 if (silc_idcache_list_first(list, &id_cache)) {
2310 client = (SilcClientEntry)id_cache->context;
2311 if (client->data.registered == FALSE) {
2312 if (!silc_idcache_list_next(list, &id_cache))
2318 if (client->router != entry) {
2319 if (server_signoff && client->connection) {
2320 clients = silc_realloc(clients,
2321 sizeof(*clients) * (clients_c + 1));
2322 clients[clients_c] = client;
2326 if (!silc_idcache_list_next(list, &id_cache))
2332 if (server_signoff) {
2333 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2334 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2335 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2337 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2339 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2340 memcpy(argv[argc], idp->data, idp->len);
2341 argv_lens[argc] = idp->len;
2342 argv_types[argc] = argc + 1;
2344 silc_buffer_free(idp);
2347 /* Remove the client entry */
2348 silc_server_remove_from_channels(server, NULL, client, FALSE,
2350 silc_idlist_del_client(server->local_list, client);
2352 if (!silc_idcache_list_next(list, &id_cache))
2356 silc_idcache_list_free(list);
2359 if (silc_idcache_get_all(server->global_list->clients, &list)) {
2361 if (silc_idcache_list_first(list, &id_cache)) {
2363 client = (SilcClientEntry)id_cache->context;
2364 if (client->data.registered == FALSE) {
2365 if (!silc_idcache_list_next(list, &id_cache))
2371 if (client->router != entry) {
2372 if (server_signoff && client->connection) {
2373 clients = silc_realloc(clients,
2374 sizeof(*clients) * (clients_c + 1));
2375 clients[clients_c] = client;
2379 if (!silc_idcache_list_next(list, &id_cache))
2385 if (server_signoff) {
2386 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2387 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2388 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2390 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2392 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2393 memcpy(argv[argc], idp->data, idp->len);
2394 argv_lens[argc] = idp->len;
2395 argv_types[argc] = argc + 1;
2397 silc_buffer_free(idp);
2400 /* Remove the client entry */
2401 silc_server_remove_from_channels(server, NULL, client, FALSE,
2403 silc_idlist_del_client(server->global_list, client);
2405 if (!silc_idcache_list_next(list, &id_cache))
2409 silc_idcache_list_free(list);
2412 /* Send the SERVER_SIGNOFF notify */
2413 if (server_signoff) {
2416 /* Send SERVER_SIGNOFF notify to our primary router */
2417 if (!server->standalone && server->router &&
2418 server->router != entry) {
2419 args = silc_argument_payload_encode(1, argv, argv_lens,
2421 silc_server_send_notify_args(server,
2422 server->router->connection,
2423 server->server_type == SILC_SERVER ?
2425 SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2427 silc_buffer_free(args);
2430 args = silc_argument_payload_encode(argc, argv, argv_lens,
2432 /* Send to local clients */
2433 for (i = 0; i < clients_c; i++) {
2434 silc_server_send_notify_args(server, clients[i]->connection,
2435 FALSE, SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2440 silc_buffer_free(args);
2442 silc_free(argv_lens);
2443 silc_free(argv_types);
2449 /* Checks whether given channel has global users. If it does this returns
2450 TRUE and FALSE if there is only locally connected clients on the channel. */
2452 int silc_server_channel_has_global(SilcChannelEntry channel)
2454 SilcChannelClientEntry chl;
2455 SilcHashTableList htl;
2457 silc_hash_table_list(channel->user_list, &htl);
2458 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2459 if (chl->client->router)
2466 /* Checks whether given channel has locally connected users. If it does this
2467 returns TRUE and FALSE if there is not one locally connected client. */
2469 int silc_server_channel_has_local(SilcChannelEntry channel)
2471 SilcChannelClientEntry chl;
2472 SilcHashTableList htl;
2474 silc_hash_table_list(channel->user_list, &htl);
2475 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2476 if (!chl->client->router)
2483 /* Removes client from all channels it has joined. This is used when client
2484 connection is disconnected. If the client on a channel is last, the
2485 channel is removed as well. This sends the SIGNOFF notify types. */
2487 void silc_server_remove_from_channels(SilcServer server,
2488 SilcSocketConnection sock,
2489 SilcClientEntry client,
2491 char *signoff_message,
2494 SilcChannelEntry channel;
2495 SilcChannelClientEntry chl;
2496 SilcHashTableList htl;
2499 SILC_LOG_DEBUG(("Start"));
2501 if (!client || !client->id)
2504 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2506 /* Remove the client from all channels. The client is removed from
2507 the channels' user list. */
2508 silc_hash_table_list(client->channels, &htl);
2509 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2510 channel = chl->channel;
2512 /* Remove channel from client's channel list */
2513 silc_hash_table_del(client->channels, channel);
2515 /* Remove channel if there is no users anymore */
2516 if (server->server_type == SILC_ROUTER &&
2517 silc_hash_table_count(channel->user_list) < 2) {
2519 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2520 if (!silc_idlist_del_channel(server->local_list, channel))
2521 silc_idlist_del_channel(server->global_list, channel);
2522 server->stat.my_channels--;
2526 /* Remove client from channel's client list */
2527 silc_hash_table_del(channel->user_list, chl->client);
2529 server->stat.my_chanclients--;
2531 /* If there is no global users on the channel anymore mark the channel
2532 as local channel. */
2533 if (server->server_type == SILC_SERVER &&
2534 !silc_server_channel_has_global(channel))
2535 channel->global_users = FALSE;
2537 /* If there is not at least one local user on the channel then we don't
2538 need the channel entry anymore, we can remove it safely. */
2539 if (server->server_type == SILC_SERVER &&
2540 !silc_server_channel_has_local(channel)) {
2541 /* Notify about leaving client if this channel has global users. */
2542 if (notify && channel->global_users)
2543 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2544 SILC_NOTIFY_TYPE_SIGNOFF,
2545 signoff_message ? 2 : 1,
2546 clidp->data, clidp->len,
2547 signoff_message, signoff_message ?
2548 strlen(signoff_message) : 0);
2551 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2553 if (channel->founder_key) {
2554 /* The founder auth data exists, do not remove the channel entry */
2555 SilcChannelClientEntry chl2;
2556 SilcHashTableList htl2;
2560 silc_hash_table_list(channel->user_list, &htl2);
2561 while (silc_hash_table_get(&htl2, NULL, (void *)&chl2)) {
2562 silc_hash_table_del(chl2->client->channels, channel);
2563 silc_hash_table_del(channel->user_list, chl2->client);
2569 /* Remove the channel entry */
2570 if (!silc_idlist_del_channel(server->local_list, channel))
2571 silc_idlist_del_channel(server->global_list, channel);
2572 server->stat.my_channels--;
2576 /* Send notify to channel about client leaving SILC and thus
2577 the entire channel. */
2579 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2580 SILC_NOTIFY_TYPE_SIGNOFF,
2581 signoff_message ? 2 : 1,
2582 clidp->data, clidp->len,
2583 signoff_message, signoff_message ?
2584 strlen(signoff_message) : 0);
2586 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2587 /* Re-generate channel key */
2588 silc_server_create_channel_key(server, channel, 0);
2590 /* Send the channel key to the channel. The key of course is not sent
2591 to the client who was removed from the channel. */
2592 silc_server_send_channel_key(server, client->connection, channel,
2593 server->server_type == SILC_ROUTER ?
2594 FALSE : !server->standalone);
2598 silc_buffer_free(clidp);
2601 /* Removes client from one channel. This is used for example when client
2602 calls LEAVE command to remove itself from the channel. Returns TRUE
2603 if channel still exists and FALSE if the channel is removed when
2604 last client leaves the channel. If `notify' is FALSE notify messages
2607 int silc_server_remove_from_one_channel(SilcServer server,
2608 SilcSocketConnection sock,
2609 SilcChannelEntry channel,
2610 SilcClientEntry client,
2613 SilcChannelClientEntry chl;
2616 SILC_LOG_DEBUG(("Start"));
2618 /* Get the entry to the channel, if this client is not on the channel
2620 if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
2623 /* Remove the client from the channel. The client is removed from
2624 the channel's user list. */
2626 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2628 /* Remove channel from client's channel list */
2629 silc_hash_table_del(client->channels, chl->channel);
2631 /* Remove channel if there is no users anymore */
2632 if (server->server_type == SILC_ROUTER &&
2633 silc_hash_table_count(channel->user_list) < 2) {
2635 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2636 if (!silc_idlist_del_channel(server->local_list, channel))
2637 silc_idlist_del_channel(server->global_list, channel);
2638 silc_buffer_free(clidp);
2639 server->stat.my_channels--;
2643 /* Remove client from channel's client list */
2644 silc_hash_table_del(channel->user_list, chl->client);
2646 server->stat.my_chanclients--;
2648 /* If there is no global users on the channel anymore mark the channel
2649 as local channel. */
2650 if (server->server_type == SILC_SERVER &&
2651 !silc_server_channel_has_global(channel))
2652 channel->global_users = FALSE;
2654 /* If there is not at least one local user on the channel then we don't
2655 need the channel entry anymore, we can remove it safely. */
2656 if (server->server_type == SILC_SERVER &&
2657 !silc_server_channel_has_local(channel)) {
2658 /* Notify about leaving client if this channel has global users. */
2659 if (notify && channel->global_users)
2660 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2661 SILC_NOTIFY_TYPE_LEAVE, 1,
2662 clidp->data, clidp->len);
2664 silc_buffer_free(clidp);
2667 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2669 if (channel->founder_key) {
2670 /* The founder auth data exists, do not remove the channel entry */
2671 SilcChannelClientEntry chl2;
2672 SilcHashTableList htl2;
2676 silc_hash_table_list(channel->user_list, &htl2);
2677 while (silc_hash_table_get(&htl2, NULL, (void *)&chl2)) {
2678 silc_hash_table_del(chl2->client->channels, channel);
2679 silc_hash_table_del(channel->user_list, chl2->client);
2685 /* Remove the channel entry */
2686 if (!silc_idlist_del_channel(server->local_list, channel))
2687 silc_idlist_del_channel(server->global_list, channel);
2688 server->stat.my_channels--;
2692 /* Send notify to channel about client leaving the channel */
2694 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2695 SILC_NOTIFY_TYPE_LEAVE, 1,
2696 clidp->data, clidp->len);
2698 silc_buffer_free(clidp);
2702 /* Returns TRUE if the given client is on the channel. FALSE if not.
2703 This works because we assure that the user list on the channel is
2704 always in up to date thus we can only check the channel list from
2705 `client' which is faster than checking the user list from `channel'. */
2707 int silc_server_client_on_channel(SilcClientEntry client,
2708 SilcChannelEntry channel)
2710 if (!client || !channel)
2713 if (silc_hash_table_find(client->channels, channel, NULL, NULL))
2719 /* Timeout callback. This is called if connection is idle or for some
2720 other reason is not responding within some period of time. This
2721 disconnects the remote end. */
2723 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2725 SilcServer server = (SilcServer)context;
2726 SilcSocketConnection sock = server->sockets[fd];
2728 SILC_LOG_DEBUG(("Start"));
2733 /* If we have protocol active we must assure that we call the protocol's
2734 final callback so that all the memory is freed. */
2735 if (sock->protocol) {
2736 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2737 silc_protocol_execute_final(sock->protocol, server->timeout_queue);
2741 if (sock->user_data)
2742 silc_server_free_sock_user_data(server, sock);
2744 silc_server_disconnect_remote(server, sock, "Server closed connection: "
2745 "Connection timeout");
2748 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2749 function may be used only by router. In real SILC network all channels
2750 are created by routers thus this function is never used by normal
2753 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2754 SilcServerID *router_id,
2760 SilcChannelID *channel_id;
2761 SilcChannelEntry entry;
2765 SILC_LOG_DEBUG(("Creating new channel"));
2768 cipher = "aes-256-cbc";
2770 hmac = "hmac-sha1-96";
2772 /* Allocate cipher */
2773 if (!silc_cipher_alloc(cipher, &key))
2777 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2778 silc_cipher_free(key);
2782 channel_name = strdup(channel_name);
2784 /* Create the channel */
2785 silc_id_create_channel_id(router_id, server->rng, &channel_id);
2786 entry = silc_idlist_add_channel(server->local_list, channel_name,
2787 SILC_CHANNEL_MODE_NONE, channel_id,
2788 NULL, key, newhmac);
2790 silc_free(channel_name);
2791 silc_cipher_free(key);
2792 silc_hmac_free(newhmac);
2796 entry->cipher = strdup(cipher);
2797 entry->hmac_name = strdup(hmac);
2799 /* Now create the actual key material */
2800 silc_server_create_channel_key(server, entry,
2801 silc_cipher_get_key_len(key) / 8);
2803 /* Notify other routers about the new channel. We send the packet
2804 to our primary route. */
2805 if (broadcast && server->standalone == FALSE)
2806 silc_server_send_new_channel(server, server->router->connection, TRUE,
2807 channel_name, entry->id,
2808 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
2811 server->stat.my_channels++;
2816 /* Same as above but creates the channel with Channel ID `channel_id. */
2819 silc_server_create_new_channel_with_id(SilcServer server,
2823 SilcChannelID *channel_id,
2826 SilcChannelEntry entry;
2830 SILC_LOG_DEBUG(("Creating new channel"));
2833 cipher = "aes-256-cbc";
2835 hmac = "hmac-sha1-96";
2837 /* Allocate cipher */
2838 if (!silc_cipher_alloc(cipher, &key))
2842 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2843 silc_cipher_free(key);
2847 channel_name = strdup(channel_name);
2849 /* Create the channel */
2850 entry = silc_idlist_add_channel(server->local_list, channel_name,
2851 SILC_CHANNEL_MODE_NONE, channel_id,
2852 NULL, key, newhmac);
2854 silc_free(channel_name);
2858 /* Now create the actual key material */
2859 silc_server_create_channel_key(server, entry,
2860 silc_cipher_get_key_len(key) / 8);
2862 /* Notify other routers about the new channel. We send the packet
2863 to our primary route. */
2864 if (broadcast && server->standalone == FALSE)
2865 silc_server_send_new_channel(server, server->router->connection, TRUE,
2866 channel_name, entry->id,
2867 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
2870 server->stat.my_channels++;
2875 /* Channel's key re-key timeout callback. */
2877 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
2879 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
2880 SilcServer server = (SilcServer)rekey->context;
2882 silc_server_create_channel_key(server, rekey->channel, rekey->key_len);
2883 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
2885 silc_task_register(server->timeout_queue, 0,
2886 silc_server_channel_key_rekey,
2887 (void *)rekey, 3600, 0,
2889 SILC_TASK_PRI_NORMAL);
2892 /* Generates new channel key. This is used to create the initial channel key
2893 but also to re-generate new key for channel. If `key_len' is provided
2894 it is the bytes of the key length. */
2896 void silc_server_create_channel_key(SilcServer server,
2897 SilcChannelEntry channel,
2901 unsigned char channel_key[32], hash[32];
2904 SILC_LOG_DEBUG(("Generating channel key"));
2906 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
2907 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
2911 if (!channel->channel_key)
2912 if (!silc_cipher_alloc("aes-256-cbc", &channel->channel_key))
2917 else if (channel->key_len)
2918 len = channel->key_len / 8;
2920 len = silc_cipher_get_key_len(channel->channel_key) / 8;
2922 /* Create channel key */
2923 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
2926 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
2928 /* Remove old key if exists */
2930 memset(channel->key, 0, channel->key_len / 8);
2931 silc_free(channel->key);
2935 channel->key_len = len * 8;
2936 channel->key = silc_calloc(len, sizeof(*channel->key));
2937 memcpy(channel->key, channel_key, len);
2938 memset(channel_key, 0, sizeof(channel_key));
2940 /* Generate HMAC key from the channel key data and set it */
2942 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2943 silc_hash_make(channel->hmac->hash, channel->key, len, hash);
2944 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2945 memset(hash, 0, sizeof(hash));
2947 if (server->server_type == SILC_ROUTER) {
2948 if (!channel->rekey)
2949 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
2950 channel->rekey->context = (void *)server;
2951 channel->rekey->channel = channel;
2952 channel->rekey->key_len = key_len;
2954 silc_task_unregister_by_callback(server->timeout_queue,
2955 silc_server_channel_key_rekey);
2956 silc_task_register(server->timeout_queue, 0,
2957 silc_server_channel_key_rekey,
2958 (void *)channel->rekey, 3600, 0,
2960 SILC_TASK_PRI_NORMAL);
2964 /* Saves the channel key found in the encoded `key_payload' buffer. This
2965 function is used when we receive Channel Key Payload and also when we're
2966 processing JOIN command reply. Returns entry to the channel. */
2968 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
2969 SilcBuffer key_payload,
2970 SilcChannelEntry channel)
2972 SilcChannelKeyPayload payload = NULL;
2973 SilcChannelID *id = NULL;
2974 unsigned char *tmp, hash[32];
2978 SILC_LOG_DEBUG(("Start"));
2980 /* Decode channel key payload */
2981 payload = silc_channel_key_payload_parse(key_payload);
2983 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
2988 /* Get the channel entry */
2991 /* Get channel ID */
2992 tmp = silc_channel_key_get_id(payload, &tmp_len);
2993 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
2999 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3001 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3003 SILC_LOG_ERROR(("Received key for non-existent channel"));
3009 tmp = silc_channel_key_get_key(payload, &tmp_len);
3015 cipher = silc_channel_key_get_cipher(payload, NULL);
3021 /* Remove old key if exists */
3023 memset(channel->key, 0, channel->key_len / 8);
3024 silc_free(channel->key);
3025 silc_cipher_free(channel->channel_key);
3028 /* Create new cipher */
3029 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3034 if (channel->cipher)
3035 silc_free(channel->cipher);
3036 channel->cipher = strdup(cipher);
3039 channel->key_len = tmp_len * 8;
3040 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
3041 memcpy(channel->key, tmp, tmp_len);
3042 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3044 /* Generate HMAC key from the channel key data and set it */
3046 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
3047 silc_hash_make(channel->hmac->hash, tmp, tmp_len, hash);
3048 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
3050 memset(hash, 0, sizeof(hash));
3051 memset(tmp, 0, tmp_len);
3053 if (server->server_type == SILC_ROUTER) {
3054 if (!channel->rekey)
3055 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3056 channel->rekey->context = (void *)server;
3057 channel->rekey->channel = channel;
3059 silc_task_unregister_by_callback(server->timeout_queue,
3060 silc_server_channel_key_rekey);
3061 silc_task_register(server->timeout_queue, 0,
3062 silc_server_channel_key_rekey,
3063 (void *)channel->rekey, 3600, 0,
3065 SILC_TASK_PRI_NORMAL);
3072 silc_channel_key_payload_free(payload);
3077 /* Heartbeat callback. This function is set as argument for the
3078 silc_socket_set_heartbeat function. The library will call this function
3079 at the set time interval. */
3081 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3084 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
3086 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname,
3089 /* Send the heartbeat */
3090 silc_server_send_heartbeat(hb->server, sock);
3093 /* Returns assembled of all servers in the given ID list. The packet's
3094 form is dictated by the New ID payload. */
3096 static void silc_server_announce_get_servers(SilcServer server,
3098 SilcBuffer *servers)
3100 SilcIDCacheList list;
3101 SilcIDCacheEntry id_cache;
3102 SilcServerEntry entry;
3105 /* Go through all clients in the list */
3106 if (silc_idcache_get_all(id_list->servers, &list)) {
3107 if (silc_idcache_list_first(list, &id_cache)) {
3109 entry = (SilcServerEntry)id_cache->context;
3111 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3113 *servers = silc_buffer_realloc(*servers,
3115 (*servers)->truelen + idp->len :
3117 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3118 silc_buffer_put(*servers, idp->data, idp->len);
3119 silc_buffer_pull(*servers, idp->len);
3120 silc_buffer_free(idp);
3122 if (!silc_idcache_list_next(list, &id_cache))
3127 silc_idcache_list_free(list);
3131 /* This function is used by router to announce existing servers to our
3132 primary router when we've connected to it. */
3134 void silc_server_announce_servers(SilcServer server)
3136 SilcBuffer servers = NULL;
3138 SILC_LOG_DEBUG(("Announcing servers"));
3140 /* Get servers in local list */
3141 silc_server_announce_get_servers(server, server->local_list, &servers);
3143 /* Get servers in global list */
3144 silc_server_announce_get_servers(server, server->global_list, &servers);
3147 silc_buffer_push(servers, servers->data - servers->head);
3148 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3150 /* Send the packet */
3151 silc_server_packet_send(server, server->router->connection,
3152 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3153 servers->data, servers->len, TRUE);
3155 silc_buffer_free(servers);
3159 /* Returns assembled packet of all clients in the given ID list. The
3160 packet's form is dictated by the New ID Payload. */
3162 static void silc_server_announce_get_clients(SilcServer server,
3164 SilcBuffer *clients)
3166 SilcIDCacheList list;
3167 SilcIDCacheEntry id_cache;
3168 SilcClientEntry client;
3171 /* Go through all clients in the list */
3172 if (silc_idcache_get_all(id_list->clients, &list)) {
3173 if (silc_idcache_list_first(list, &id_cache)) {
3175 client = (SilcClientEntry)id_cache->context;
3177 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3179 *clients = silc_buffer_realloc(*clients,
3181 (*clients)->truelen + idp->len :
3183 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3184 silc_buffer_put(*clients, idp->data, idp->len);
3185 silc_buffer_pull(*clients, idp->len);
3186 silc_buffer_free(idp);
3188 if (!silc_idcache_list_next(list, &id_cache))
3193 silc_idcache_list_free(list);
3197 /* This function is used to announce our existing clients to our router
3198 when we've connected to it. */
3200 void silc_server_announce_clients(SilcServer server)
3202 SilcBuffer clients = NULL;
3204 SILC_LOG_DEBUG(("Announcing clients"));
3206 /* Get clients in local list */
3207 silc_server_announce_get_clients(server, server->local_list,
3210 /* As router we announce our global list as well */
3211 if (server->server_type == SILC_ROUTER)
3212 silc_server_announce_get_clients(server, server->global_list,
3216 silc_buffer_push(clients, clients->data - clients->head);
3217 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3219 /* Send the packet */
3220 silc_server_packet_send(server, server->router->connection,
3221 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3222 clients->data, clients->len, TRUE);
3224 silc_buffer_free(clients);
3229 silc_server_announce_encode_notify(SilcNotifyType notify, uint32 argc, ...)
3234 return silc_notify_payload_encode(notify, argc, ap);
3237 /* Returns assembled packets for channel users of the `channel'. */
3239 void silc_server_announce_get_channel_users(SilcServer server,
3240 SilcChannelEntry channel,
3241 SilcBuffer *channel_users,
3242 SilcBuffer *channel_users_modes)
3244 SilcChannelClientEntry chl;
3245 SilcHashTableList htl;
3246 SilcBuffer chidp, clidp;
3249 unsigned char mode[4];
3251 SILC_LOG_DEBUG(("Start"));
3253 /* Now find all users on the channel */
3254 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3255 silc_hash_table_list(channel->user_list, &htl);
3256 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3257 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3260 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
3261 clidp->data, clidp->len,
3262 chidp->data, chidp->len);
3265 silc_buffer_realloc(*channel_users,
3267 (*channel_users)->truelen + len : len));
3268 silc_buffer_pull_tail(*channel_users,
3269 ((*channel_users)->end -
3270 (*channel_users)->data));
3272 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3273 silc_buffer_pull(*channel_users, len);
3274 silc_buffer_free(tmp);
3276 /* CUMODE notify for mode change on the channel */
3277 SILC_PUT32_MSB(chl->mode, mode);
3278 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
3279 3, clidp->data, clidp->len,
3281 clidp->data, clidp->len);
3283 *channel_users_modes =
3284 silc_buffer_realloc(*channel_users_modes,
3285 (*channel_users_modes ?
3286 (*channel_users_modes)->truelen + len : len));
3287 silc_buffer_pull_tail(*channel_users_modes,
3288 ((*channel_users_modes)->end -
3289 (*channel_users_modes)->data));
3291 silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
3292 silc_buffer_pull(*channel_users_modes, len);
3293 silc_buffer_free(tmp);
3295 silc_buffer_free(clidp);
3297 silc_buffer_free(chidp);
3300 /* Returns assembled packets for all channels and users on those channels
3301 from the given ID List. The packets are in the form dictated by the
3302 New Channel and New Channel User payloads. */
3304 void silc_server_announce_get_channels(SilcServer server,
3306 SilcBuffer *channels,
3307 SilcBuffer *channel_users,
3308 SilcBuffer *channel_users_modes)
3310 SilcIDCacheList list;
3311 SilcIDCacheEntry id_cache;
3312 SilcChannelEntry channel;
3318 SILC_LOG_DEBUG(("Start"));
3320 /* Go through all channels in the list */
3321 if (silc_idcache_get_all(id_list->channels, &list)) {
3322 if (silc_idcache_list_first(list, &id_cache)) {
3324 channel = (SilcChannelEntry)id_cache->context;
3326 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3327 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3328 name_len = strlen(channel->channel_name);
3330 len = 4 + name_len + id_len + 4;
3332 silc_buffer_realloc(*channels,
3333 (*channels ? (*channels)->truelen + len : len));
3334 silc_buffer_pull_tail(*channels,
3335 ((*channels)->end - (*channels)->data));
3336 silc_buffer_format(*channels,
3337 SILC_STR_UI_SHORT(name_len),
3338 SILC_STR_UI_XNSTRING(channel->channel_name,
3340 SILC_STR_UI_SHORT(id_len),
3341 SILC_STR_UI_XNSTRING(cid, id_len),
3342 SILC_STR_UI_INT(channel->mode),
3344 silc_buffer_pull(*channels, len);
3346 silc_server_announce_get_channel_users(server, channel,
3348 channel_users_modes);
3352 if (!silc_idcache_list_next(list, &id_cache))
3357 silc_idcache_list_free(list);
3361 /* This function is used to announce our existing channels to our router
3362 when we've connected to it. This also announces the users on the
3363 channels to the router. */
3365 void silc_server_announce_channels(SilcServer server)
3367 SilcBuffer channels = NULL, channel_users = NULL, channel_users_modes = NULL;
3369 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3371 /* Get channels and channel users in local list */
3372 silc_server_announce_get_channels(server, server->local_list,
3373 &channels, &channel_users,
3374 &channel_users_modes);
3376 /* Get channels and channel users in global list */
3377 silc_server_announce_get_channels(server, server->global_list,
3378 &channels, &channel_users,
3379 &channel_users_modes);
3382 silc_buffer_push(channels, channels->data - channels->head);
3383 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3385 /* Send the packet */
3386 silc_server_packet_send(server, server->router->connection,
3387 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3388 channels->data, channels->len,
3391 silc_buffer_free(channels);
3394 if (channel_users) {
3395 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3396 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3397 channel_users->len);
3399 /* Send the packet */
3400 silc_server_packet_send(server, server->router->connection,
3401 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3402 channel_users->data, channel_users->len,
3405 silc_buffer_free(channel_users);
3408 if (channel_users_modes) {
3409 silc_buffer_push(channel_users_modes,
3410 channel_users_modes->data - channel_users_modes->head);
3411 SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes->data,
3412 channel_users_modes->len);
3414 /* Send the packet */
3415 silc_server_packet_send(server, server->router->connection,
3416 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3417 channel_users_modes->data,
3418 channel_users_modes->len,
3421 silc_buffer_free(channel_users_modes);
3425 /* Failure timeout callback. If this is called then we will immediately
3426 process the received failure. We always process the failure with timeout
3427 since we do not want to blindly trust to received failure packets.
3428 This won't be called (the timeout is cancelled) if the failure was
3429 bogus (it is bogus if remote does not close the connection after sending
3432 SILC_TASK_CALLBACK(silc_server_failure_callback)
3434 SilcServerFailureContext f = (SilcServerFailureContext)context;
3436 if (f->sock->protocol) {
3437 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3438 silc_protocol_execute(f->sock->protocol, f->server->timeout_queue, 0, 0);
3444 /* Assembles user list and users mode list from the `channel'. */
3446 void silc_server_get_users_on_channel(SilcServer server,
3447 SilcChannelEntry channel,
3448 SilcBuffer *user_list,
3449 SilcBuffer *mode_list,
3452 SilcChannelClientEntry chl;
3453 SilcHashTableList htl;
3454 SilcBuffer client_id_list;
3455 SilcBuffer client_mode_list;
3457 uint32 list_count = 0;
3459 /* XXX rewrite - this does not support IPv6 based Client ID's. */
3462 silc_buffer_alloc((SILC_ID_CLIENT_LEN + 4) *
3463 silc_hash_table_count(channel->user_list));
3465 silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
3466 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3467 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3468 silc_hash_table_list(channel->user_list, &htl);
3469 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3471 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3472 silc_buffer_put(client_id_list, idp->data, idp->len);
3473 silc_buffer_pull(client_id_list, idp->len);
3474 silc_buffer_free(idp);
3476 /* Client's mode on channel */
3477 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3478 silc_buffer_pull(client_mode_list, 4);
3482 silc_buffer_push(client_id_list,
3483 client_id_list->data - client_id_list->head);
3484 silc_buffer_push(client_mode_list,
3485 client_mode_list->data - client_mode_list->head);
3487 *user_list = client_id_list;
3488 *mode_list = client_mode_list;
3489 *user_count = list_count;
3492 /* Saves users and their modes to the `channel'. */
3494 void silc_server_save_users_on_channel(SilcServer server,
3495 SilcSocketConnection sock,
3496 SilcChannelEntry channel,
3497 SilcClientID *noadd,
3498 SilcBuffer user_list,
3499 SilcBuffer mode_list,
3504 /* Cache the received Client ID's and modes. This cache expires
3505 whenever server sends notify message to channel. It means two things;
3506 some user has joined or leaved the channel. XXX TODO! */
3507 for (i = 0; i < user_count; i++) {
3510 SilcClientID *client_id;
3511 SilcClientEntry client;
3514 SILC_GET16_MSB(idp_len, user_list->data + 2);
3516 client_id = silc_id_payload_parse_id(user_list->data, idp_len);
3517 silc_buffer_pull(user_list, idp_len);
3522 SILC_GET32_MSB(mode, mode_list->data);
3523 silc_buffer_pull(mode_list, 4);
3525 if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3526 silc_free(client_id);
3530 /* Check if we have this client cached already. */
3531 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3534 client = silc_idlist_find_client_by_id(server->global_list,
3537 /* If router did not find such Client ID in its lists then this must
3538 be bogus client or some router in the net is buggy. */
3539 if (server->server_type == SILC_ROUTER) {
3540 silc_free(client_id);
3544 /* We don't have that client anywhere, add it. The client is added
3545 to global list since server didn't have it in the lists so it must be
3547 client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
3548 silc_id_dup(client_id, SILC_ID_CLIENT),
3549 sock->user_data, NULL);
3551 silc_free(client_id);
3555 client->data.registered = TRUE;
3558 silc_free(client_id);
3560 if (!silc_server_client_on_channel(client, channel)) {
3561 /* Client was not on the channel, add it. */
3562 SilcChannelClientEntry chl = silc_calloc(1, sizeof(*chl));
3563 chl->client = client;
3565 chl->channel = channel;
3566 silc_hash_table_add(channel->user_list, chl->client, chl);
3567 silc_hash_table_add(client->channels, chl->channel, chl);
3572 /* Lookups route to the client indicated by the `id_data'. The connection
3573 object and internal data object is returned. Returns NULL if route
3574 could not be found to the client. If the `client_id' is specified then
3575 it is used and the `id_data' is ignored. */
3577 SilcSocketConnection silc_server_get_client_route(SilcServer server,
3578 unsigned char *id_data,
3580 SilcClientID *client_id,
3581 SilcIDListData *idata)
3584 SilcClientEntry client;
3586 SILC_LOG_DEBUG(("Start"));
3588 /* Decode destination Client ID */
3590 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
3592 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
3596 id = silc_id_dup(client_id, SILC_ID_CLIENT);
3599 /* If the destination belongs to our server we don't have to route
3600 the packet anywhere but to send it to the local destination. */
3601 client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
3605 if (client && client->data.registered == FALSE)
3608 /* If we are router and the client has router then the client is in
3609 our cell but not directly connected to us. */
3610 if (server->server_type == SILC_ROUTER && client->router) {
3611 /* We are of course in this case the client's router thus the real
3612 "router" of the client is the server who owns the client. Thus
3613 we will send the packet to that server. */
3615 *idata = (SilcIDListData)client->router;
3616 return client->router->connection;
3619 /* Seems that client really is directly connected to us */
3621 *idata = (SilcIDListData)client;
3622 return client->connection;
3625 /* Destination belongs to someone not in this server. If we are normal
3626 server our action is to send the packet to our router. */
3627 if (server->server_type == SILC_SERVER && !server->standalone) {
3630 *idata = (SilcIDListData)server->router;
3631 return server->router->connection;
3634 /* We are router and we will perform route lookup for the destination
3635 and send the packet to fastest route. */
3636 if (server->server_type == SILC_ROUTER && !server->standalone) {
3637 /* Check first that the ID is valid */
3638 client = silc_idlist_find_client_by_id(server->global_list, id, NULL);
3640 SilcSocketConnection dst_sock;
3642 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
3646 *idata = (SilcIDListData)dst_sock->user_data;
3655 /* Encodes and returns channel list of channels the `client' has joined.
3656 Secret channels are not put to the list. */
3658 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
3659 SilcClientEntry client)
3661 SilcBuffer buffer = NULL;
3662 SilcChannelEntry channel;
3663 SilcChannelClientEntry chl;
3664 SilcHashTableList htl;
3670 silc_hash_table_list(client->channels, &htl);
3671 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3672 channel = chl->channel;
3674 if (channel->mode & SILC_CHANNEL_MODE_SECRET)
3677 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3678 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3679 name_len = strlen(channel->channel_name);
3681 len = 4 + name_len + id_len + 4;
3682 buffer = silc_buffer_realloc(buffer,
3683 (buffer ? (buffer)->truelen + len : len));
3684 silc_buffer_pull_tail(buffer, ((buffer)->end - (buffer)->data));
3685 silc_buffer_format(buffer,
3686 SILC_STR_UI_SHORT(name_len),
3687 SILC_STR_UI_XNSTRING(channel->channel_name,
3689 SILC_STR_UI_SHORT(id_len),
3690 SILC_STR_UI_XNSTRING(cid, id_len),
3691 SILC_STR_UI_INT(chl->mode), /* Client's mode */
3693 silc_buffer_pull(buffer, len);
3698 silc_buffer_push(buffer, buffer->data - buffer->head);
3703 /* Finds client entry by Client ID and if it is not found then resolves
3704 it using WHOIS command. */
3706 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
3707 SilcClientID *client_id)
3709 SilcClientEntry client;
3711 client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL);
3713 client = silc_idlist_find_client_by_id(server->global_list,
3715 if (!client && server->server_type == SILC_ROUTER)
3719 if (!client && server->standalone)
3722 if (!client || !client->nickname || !client->username) {
3723 SilcBuffer buffer, idp;
3725 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
3726 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
3727 ++server->cmd_ident, 1,
3728 3, idp->data, idp->len);
3729 silc_server_packet_send(server, client ? client->router->connection :
3730 server->router->connection,
3731 SILC_PACKET_COMMAND, 0,
3732 buffer->data, buffer->len, FALSE);
3733 silc_buffer_free(idp);
3734 silc_buffer_free(buffer);
3740 /* A timeout callback for the re-key. We will be the initiator of the
3743 SILC_TASK_CALLBACK(silc_server_rekey_callback)
3745 SilcSocketConnection sock = (SilcSocketConnection)context;
3746 SilcIDListData idata = (SilcIDListData)sock->user_data;
3747 SilcServer server = (SilcServer)idata->rekey->context;
3748 SilcProtocol protocol;
3749 SilcServerRekeyInternalContext *proto_ctx;
3751 SILC_LOG_DEBUG(("Start"));
3753 /* Allocate internal protocol context. This is sent as context
3755 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
3756 proto_ctx->server = (void *)server;
3757 proto_ctx->sock = sock;
3758 proto_ctx->responder = FALSE;
3759 proto_ctx->pfs = idata->rekey->pfs;
3761 /* Perform rekey protocol. Will call the final callback after the
3762 protocol is over. */
3763 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
3764 &protocol, proto_ctx, silc_server_rekey_final);
3765 sock->protocol = protocol;
3767 /* Run the protocol */
3768 silc_protocol_execute(protocol, server->timeout_queue, 0, 0);
3770 /* Re-register re-key timeout */
3771 silc_task_register(server->timeout_queue, sock->sock,
3772 silc_server_rekey_callback,
3773 context, idata->rekey->timeout, 0,
3774 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
3777 /* The final callback for the REKEY protocol. This will actually take the
3778 new key material into use. */
3780 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
3782 SilcProtocol protocol = (SilcProtocol)context;
3783 SilcServerRekeyInternalContext *ctx =
3784 (SilcServerRekeyInternalContext *)protocol->context;
3785 SilcServer server = (SilcServer)ctx->server;
3786 SilcSocketConnection sock = ctx->sock;
3788 SILC_LOG_DEBUG(("Start"));
3790 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
3791 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
3792 /* Error occured during protocol */
3793 silc_protocol_cancel(protocol, server->timeout_queue);
3794 silc_protocol_free(protocol);
3795 sock->protocol = NULL;
3797 silc_packet_context_free(ctx->packet);
3799 silc_ske_free(ctx->ske);
3805 silc_protocol_free(protocol);
3806 sock->protocol = NULL;
3808 silc_packet_context_free(ctx->packet);
3810 silc_ske_free(ctx->ske);