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 server->public_key = server->config->server_keys->public_key;
125 server->private_key = server->config->server_keys->private_key;
126 if (!server->public_key || !server->private_key) {
127 SILC_LOG_ERROR(("Server public key and/or private key does not exist"));
131 /* XXX After server is made as Silc Server Library this can be given
132 as argument, for now this is hard coded */
133 server->params = silc_calloc(1, sizeof(*server->params));
134 server->params->retry_count = SILC_SERVER_RETRY_COUNT;
135 server->params->retry_interval_min = SILC_SERVER_RETRY_INTERVAL_MIN;
136 server->params->retry_interval_max = SILC_SERVER_RETRY_INTERVAL_MAX;
137 server->params->retry_keep_trying = FALSE;
138 server->params->protocol_timeout = 60;
139 server->params->require_reverse_mapping = FALSE;
141 /* Set log files where log message should be saved. */
142 server->config->server = server;
143 silc_server_config_setlogfiles(server->config);
145 /* Register all configured ciphers, PKCS and hash functions. */
146 silc_server_config_register_ciphers(server->config);
147 silc_server_config_register_pkcs(server->config);
148 silc_server_config_register_hashfuncs(server->config);
149 silc_server_config_register_hmacs(server->config);
151 /* Initialize random number generator for the server. */
152 server->rng = silc_rng_alloc();
153 silc_rng_init(server->rng);
154 silc_rng_global_init(server->rng);
156 /* Initialize hash functions for server to use */
157 silc_hash_alloc("md5", &server->md5hash);
158 silc_hash_alloc("sha1", &server->sha1hash);
160 /* Initialize none cipher */
161 silc_cipher_alloc("none", &server->none_cipher);
163 /* Create a listening server. Note that our server can listen on
164 multiple ports. All listeners are created here and now. */
165 /* XXX Still check this whether to use server_info or listen_port. */
167 while(server->config->listen_port) {
170 tmp = silc_net_create_server(server->config->listen_port->port,
171 server->config->listen_port->host);
175 sock = silc_realloc(sock, (sizeof(int *) * (sock_count + 1)));
176 sock[sock_count] = tmp;
177 server->config->listen_port = server->config->listen_port->next;
181 /* Initialize ID caches */
182 server->local_list->clients =
183 silc_idcache_alloc(0, silc_idlist_client_destructor);
184 server->local_list->servers = silc_idcache_alloc(0, NULL);
185 server->local_list->channels = silc_idcache_alloc(0, NULL);
187 /* These are allocated for normal server as well as these hold some
188 global information that the server has fetched from its router. For
189 router these are used as they are supposed to be used on router. */
190 server->global_list->clients =
191 silc_idcache_alloc(0, silc_idlist_client_destructor);
192 server->global_list->servers = silc_idcache_alloc(0, NULL);
193 server->global_list->channels = silc_idcache_alloc(0, NULL);
195 /* Allocate the entire socket list that is used in server. Eventually
196 all connections will have entry in this table (it is a table of
197 pointers to the actual object that is allocated individually
199 server->sockets = silc_calloc(SILC_SERVER_MAX_CONNECTIONS,
200 sizeof(*server->sockets));
202 for (i = 0; i < sock_count; i++) {
203 SilcSocketConnection newsocket = NULL;
205 /* Set socket to non-blocking mode */
206 silc_net_set_socket_nonblock(sock[i]);
207 server->sock = sock[i];
209 /* Create a Server ID for the server. */
210 silc_id_create_server_id(sock[i], server->rng, &id);
216 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
217 server->id_string_len = silc_id_get_len(SILC_ID_SERVER);
218 server->id_type = SILC_ID_SERVER;
219 server->server_name = server->config->server_info->server_name;
221 /* Add ourselves to the server list. We don't have a router yet
222 beacuse we haven't established a route yet. It will be done later.
223 For now, NULL is sent as router. This allocates new entry to
226 silc_idlist_add_server(server->local_list,
227 server->config->server_info->server_name,
228 server->server_type, server->id, NULL, NULL);
230 SILC_LOG_ERROR(("Could not add ourselves to cache"));
234 /* Add ourselves also to the socket table. The entry allocated above
235 is sent as argument for fast referencing in the future. */
236 silc_socket_alloc(sock[i], SILC_SOCKET_TYPE_SERVER, id_entry,
239 server->sockets[sock[i]] = newsocket;
241 /* Put the allocated socket pointer also to the entry allocated above
242 for fast back-referencing to the socket list. */
243 id_entry->connection = (void *)server->sockets[sock[i]];
244 server->id_entry = id_entry;
247 /* Register the task queues. In SILC we have by default three task queues.
248 One task queue for non-timeout tasks which perform different kind of
249 I/O on file descriptors, timeout task queue for timeout tasks, and,
250 generic non-timeout task queue whose tasks apply to all connections. */
251 silc_task_queue_alloc(&server->io_queue, TRUE);
252 if (!server->io_queue) {
255 silc_task_queue_alloc(&server->timeout_queue, TRUE);
256 if (!server->timeout_queue) {
259 silc_task_queue_alloc(&server->generic_queue, TRUE);
260 if (!server->generic_queue) {
264 /* Register protocols */
265 silc_server_protocols_register();
267 /* Initialize the scheduler */
268 silc_schedule_init(&server->io_queue, &server->timeout_queue,
269 &server->generic_queue,
270 SILC_SERVER_MAX_CONNECTIONS);
272 /* Add the first task to the queue. This is task that is executed by
273 timeout. It expires as soon as the caller calls silc_server_run. This
274 task performs authentication protocol and key exchange with our
276 silc_task_register(server->timeout_queue, sock[0],
277 silc_server_connect_to_router,
278 (void *)server, 0, 1,
280 SILC_TASK_PRI_NORMAL);
282 /* Add listener task to the queue. This task receives new connections to the
283 server. This task remains on the queue until the end of the program. */
284 silc_task_register(server->io_queue, sock[0],
285 silc_server_accept_new_connection,
286 (void *)server, 0, 0,
288 SILC_TASK_PRI_NORMAL);
289 server->listenning = TRUE;
291 /* If server connections has been configured then we must be router as
292 normal server cannot have server connections, only router connections. */
293 if (server->config->servers)
294 server->server_type = SILC_ROUTER;
296 /* Register the ID Cache purge task. This periodically purges the ID cache
297 and removes the expired cache entries. */
299 /* Clients local list */
300 purge = silc_calloc(1, sizeof(*purge));
301 purge->cache = server->local_list->clients;
302 purge->timeout_queue = server->timeout_queue;
303 silc_task_register(purge->timeout_queue, 0,
305 (void *)purge, 600, 0,
306 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
308 /* Clients global list */
309 purge = silc_calloc(1, sizeof(*purge));
310 purge->cache = server->global_list->clients;
311 purge->timeout_queue = server->timeout_queue;
312 silc_task_register(purge->timeout_queue, 0,
314 (void *)purge, 300, 0,
315 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
317 SILC_LOG_DEBUG(("Server initialized"));
319 /* We are done here, return succesfully */
322 silc_task_queue_free(server->timeout_queue);
324 silc_task_queue_free(server->io_queue);
326 for (i = 0; i < sock_count; i++)
327 silc_net_close_server(sock[i]);
332 /* Fork server to background and set gid+uid to non-root.
333 Silcd will not run as root, so trying to set either user or group to
334 root will cause silcd to exit. */
336 void silc_server_daemonise(SilcServer server)
338 /* Are we executing silcd as root or a regular user? */
345 if (!server->config->identity || !server->config->identity->user ||
346 !server->config->identity->group) {
347 fprintf(stderr, "Error:"
348 "\tSILC server must not be run as root. For the security of your\n"
349 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
350 "\tuser account. Modify the [Identity] configuration section to run\n"
351 "\tthe server as non-root user.\n");
355 /* Get the values given for user and group in configuration file */
356 user=server->config->identity->user;
357 group=server->config->identity->group;
359 /* Check whether the user/group information is text */
360 if (atoi(user)!=0 || atoi(group)!=0) {
361 SILC_LOG_DEBUG(("Invalid user and/or group information"));
362 SILC_LOG_DEBUG(("User and/or group given as number"));
363 fprintf(stderr, "Invalid user and/or group information\n");
364 fprintf(stderr, "Please assign them as names, not numbers\n");
368 /* Catch the nasty incident of string "0" returning 0 from atoi */
369 if (strcmp("0", user)==0 || strcmp("0", group)==0) {
370 SILC_LOG_DEBUG(("User and/or group configured to 0. Unacceptable"));
371 fprintf(stderr, "User and/or group configured to 0. Exiting\n");
379 fprintf(stderr, "No such user %s found\n", user);
384 fprintf(stderr, "No such group %s found\n", group);
388 /* Check whether user and/or group is set to root. If yes, exit
389 immediately. Otherwise, setgid and setuid server to user.group */
390 if (gr->gr_gid==0 || pw->pw_uid==0) {
391 fprintf(stderr, "Error:"
392 "\tSILC server must not be run as root. For the security of your\n"
393 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
394 "\tuser account. Modify the [Identity] configuration section to run\n"
395 "\tthe server as non-root user.\n");
398 /* Fork server to background, making it a daemon */
400 SILC_LOG_DEBUG(("Server started as root. Dropping privileges."));
401 SILC_LOG_DEBUG(("Forking SILC server to background"));
406 SILC_LOG_DEBUG(("Changing to group %s", group));
407 if(setgid(gr->gr_gid)==0) {
408 SILC_LOG_DEBUG(("Setgid to %s", group));
410 SILC_LOG_DEBUG(("Setgid to %s failed", group));
411 fprintf(stderr, "Tried to setgid %s but no such group. Exiting\n",
415 SILC_LOG_DEBUG(("Changing to user nobody"));
416 if(setuid(pw->pw_uid)==0) {
417 SILC_LOG_DEBUG(("Setuid to %s", user));
419 SILC_LOG_DEBUG(("Setuid to %s failed", user));
420 fprintf(stderr, "Tried to setuid %s but no such user. Exiting\n",
426 /* Fork server to background, making it a daemon */
428 SILC_LOG_DEBUG(("Server started as user"));
429 SILC_LOG_DEBUG(("Forking SILC server to background"));
436 /* Stops the SILC server. This function is used to shutdown the server.
437 This is usually called after the scheduler has returned. After stopping
438 the server one should call silc_server_free. */
440 void silc_server_stop(SilcServer server)
442 SILC_LOG_DEBUG(("Stopping server"));
444 /* Stop the scheduler, although it might be already stopped. This
445 doesn't hurt anyone. This removes all the tasks and task queues,
447 silc_schedule_stop();
448 silc_schedule_uninit();
450 silc_server_protocols_unregister();
452 SILC_LOG_DEBUG(("Server stopped"));
455 /* The heart of the server. This runs the scheduler thus runs the server.
456 When this returns the server has been stopped and the program will
459 void silc_server_run(SilcServer server)
461 SILC_LOG_DEBUG(("Running server"));
463 /* Start the scheduler, the heart of the SILC server. When this returns
464 the program will be terminated. */
468 /* Timeout callback that will be called to retry connecting to remote
469 router. This is used by both normal and router server. This will wait
470 before retrying the connecting. The timeout is generated by exponential
471 backoff algorithm. */
473 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
475 SilcServerConnection sconn = (SilcServerConnection)context;
476 SilcServer server = sconn->server;
478 SILC_LOG_INFO(("Retrying connecting to a router"));
480 /* Calculate next timeout */
481 if (sconn->retry_count >= 1) {
482 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
483 if (sconn->retry_timeout > SILC_SERVER_RETRY_INTERVAL_MAX)
484 sconn->retry_timeout = SILC_SERVER_RETRY_INTERVAL_MAX;
486 sconn->retry_timeout = server->params->retry_interval_min;
488 sconn->retry_count++;
489 sconn->retry_timeout = sconn->retry_timeout +
490 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
492 /* If we've reached max retry count, give up. */
493 if (sconn->retry_count > server->params->retry_count &&
494 server->params->retry_keep_trying == FALSE) {
495 SILC_LOG_ERROR(("Could not connect to router, giving up"));
499 /* Wait one before retrying */
500 silc_task_register(server->timeout_queue, fd, silc_server_connect_router,
501 context, sconn->retry_timeout,
502 server->params->retry_interval_min_usec,
503 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
506 /* Generic routine to use connect to a router. */
508 SILC_TASK_CALLBACK(silc_server_connect_router)
510 SilcServerConnection sconn = (SilcServerConnection)context;
511 SilcServer server = sconn->server;
512 SilcSocketConnection newsocket;
513 SilcProtocol protocol;
514 SilcServerKEInternalContext *proto_ctx;
517 /* Connect to remote host */
518 sock = silc_net_create_connection(sconn->remote_port,
521 SILC_LOG_ERROR(("Could not connect to router"));
522 silc_task_register(server->timeout_queue, fd,
523 silc_server_connect_to_router_retry,
524 context, 0, 1, SILC_TASK_TIMEOUT,
525 SILC_TASK_PRI_NORMAL);
529 /* Set socket options */
530 silc_net_set_socket_nonblock(sock);
531 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
533 /* Create socket connection for the connection. Even though we
534 know that we are connecting to a router we will mark the socket
535 to be unknown connection until we have executed authentication
537 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
538 server->sockets[sock] = newsocket;
539 newsocket->hostname = strdup(sconn->remote_host);
540 newsocket->ip = strdup(sconn->remote_host);
541 newsocket->port = sconn->remote_port;
542 sconn->sock = newsocket;
544 /* Allocate internal protocol context. This is sent as context
546 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
547 proto_ctx->server = (void *)server;
548 proto_ctx->context = (void *)sconn;
549 proto_ctx->sock = newsocket;
550 proto_ctx->rng = server->rng;
551 proto_ctx->responder = FALSE;
553 /* Perform key exchange protocol. silc_server_connect_to_router_second
554 will be called after the protocol is finished. */
555 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
556 &protocol, proto_ctx,
557 silc_server_connect_to_router_second);
558 newsocket->protocol = protocol;
560 /* Register a timeout task that will be executed if the protocol
561 is not executed within set limit. */
562 proto_ctx->timeout_task =
563 silc_task_register(server->timeout_queue, sock,
564 silc_server_timeout_remote,
565 server, server->params->protocol_timeout,
566 server->params->protocol_timeout_usec,
570 /* Register the connection for network input and output. This sets
571 that scheduler will listen for incoming packets for this connection
572 and sets that outgoing packets may be sent to this connection as
573 well. However, this doesn't set the scheduler for outgoing traffic,
574 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
575 later when outgoing data is available. */
576 context = (void *)server;
577 SILC_REGISTER_CONNECTION_FOR_IO(sock);
579 /* Run the protocol */
580 protocol->execute(server->timeout_queue, 0, protocol, sock, 0, 0);
583 /* This function connects to our primary router or if we are a router this
584 establishes all our primary routes. This is called at the start of the
585 server to do authentication and key exchange with our router - called
588 SILC_TASK_CALLBACK(silc_server_connect_to_router)
590 SilcServer server = (SilcServer)context;
591 SilcServerConnection sconn;
593 SILC_LOG_DEBUG(("Connecting to router(s)"));
595 /* If we are normal SILC server we need to connect to our cell's
597 if (server->server_type == SILC_SERVER) {
598 SILC_LOG_DEBUG(("We are normal server"));
600 /* Create connection to the router, if configured. */
601 if (server->config->routers) {
603 /* Allocate connection object for hold connection specific stuff. */
604 sconn = silc_calloc(1, sizeof(*sconn));
605 sconn->server = server;
606 sconn->remote_host = strdup(server->config->routers->host);
607 sconn->remote_port = server->config->routers->port;
609 silc_task_register(server->timeout_queue, fd,
610 silc_server_connect_router,
611 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
612 SILC_TASK_PRI_NORMAL);
617 /* If we are a SILC router we need to establish all of our primary
619 if (server->server_type == SILC_ROUTER) {
620 SilcServerConfigSectionServerConnection *ptr;
622 SILC_LOG_DEBUG(("We are router"));
624 /* Create the connections to all our routes */
625 ptr = server->config->routers;
628 SILC_LOG_DEBUG(("Router connection [%s] %s:%d",
629 ptr->initiator ? "Initiator" : "Responder",
630 ptr->host, ptr->port));
632 if (ptr->initiator) {
633 /* Allocate connection object for hold connection specific stuff. */
634 sconn = silc_calloc(1, sizeof(*sconn));
635 sconn->server = server;
636 sconn->remote_host = strdup(ptr->host);
637 sconn->remote_port = ptr->port;
639 silc_task_register(server->timeout_queue, fd,
640 silc_server_connect_router,
641 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
642 SILC_TASK_PRI_NORMAL);
652 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
654 /* There wasn't a configured router, we will continue but we don't
655 have a connection to outside world. We will be standalone server. */
656 server->standalone = TRUE;
659 /* Second part of connecting to router(s). Key exchange protocol has been
660 executed and now we will execute authentication protocol. */
662 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
664 SilcProtocol protocol = (SilcProtocol)context;
665 SilcServerKEInternalContext *ctx =
666 (SilcServerKEInternalContext *)protocol->context;
667 SilcServer server = (SilcServer)ctx->server;
668 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
669 SilcSocketConnection sock = server->sockets[fd];
670 SilcServerConnAuthInternalContext *proto_ctx;
671 SilcServerConfigSectionServerConnection *conn = NULL;
673 SILC_LOG_DEBUG(("Start"));
675 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
676 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
677 /* Error occured during protocol */
678 silc_protocol_free(protocol);
679 sock->protocol = NULL;
680 silc_ske_free_key_material(ctx->keymat);
682 silc_packet_context_free(ctx->packet);
684 silc_ske_free(ctx->ske);
686 silc_free(ctx->dest_id);
688 silc_task_unregister_by_callback(server->timeout_queue,
689 silc_server_failure_callback);
690 silc_server_disconnect_remote(server, sock, "Server closed connection: "
691 "Key exchange failed");
695 /* We now have the key material as the result of the key exchange
696 protocol. Take the key material into use. Free the raw key material
697 as soon as we've set them into use. */
698 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
699 ctx->ske->prop->cipher,
700 ctx->ske->prop->pkcs,
701 ctx->ske->prop->hash,
702 ctx->ske->prop->hmac,
703 ctx->ske->prop->group,
705 silc_protocol_free(protocol);
706 sock->protocol = NULL;
707 silc_ske_free_key_material(ctx->keymat);
709 silc_packet_context_free(ctx->packet);
711 silc_ske_free(ctx->ske);
713 silc_free(ctx->dest_id);
715 silc_task_unregister_by_callback(server->timeout_queue,
716 silc_server_failure_callback);
717 silc_server_disconnect_remote(server, sock, "Server closed connection: "
718 "Key exchange failed");
721 silc_ske_free_key_material(ctx->keymat);
723 /* Allocate internal context for the authentication protocol. This
724 is sent as context for the protocol. */
725 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
726 proto_ctx->server = (void *)server;
727 proto_ctx->context = (void *)sconn;
728 proto_ctx->sock = sock;
729 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
730 proto_ctx->dest_id_type = ctx->dest_id_type;
731 proto_ctx->dest_id = ctx->dest_id;
733 /* Resolve the authentication method used in this connection. Check if
734 we find a match from user configured connections */
735 conn = silc_server_config_find_router_conn(server->config,
739 /* Match found. Use the configured authentication method */
740 proto_ctx->auth_meth = conn->auth_meth;
741 if (conn->auth_data) {
742 proto_ctx->auth_data = strdup(conn->auth_data);
743 proto_ctx->auth_data_len = strlen(conn->auth_data);
746 SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
747 sock->hostname, sock->ip, sock->port));
748 silc_protocol_free(protocol);
749 sock->protocol = NULL;
751 silc_packet_context_free(ctx->packet);
753 silc_ske_free(ctx->ske);
755 silc_free(ctx->dest_id);
757 silc_task_unregister_by_callback(server->timeout_queue,
758 silc_server_failure_callback);
759 silc_server_disconnect_remote(server, sock, "Server closed connection: "
760 "Key exchange failed");
764 /* Free old protocol as it is finished now */
765 silc_protocol_free(protocol);
767 silc_packet_context_free(ctx->packet);
769 sock->protocol = NULL;
771 /* Allocate the authentication protocol. This is allocated here
772 but we won't start it yet. We will be receiving party of this
773 protocol thus we will wait that connecting party will make
775 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
776 &sock->protocol, proto_ctx,
777 silc_server_connect_to_router_final);
779 /* Register timeout task. If the protocol is not executed inside
780 this timelimit the connection will be terminated. Currently
781 this is 15 seconds and is hard coded limit (XXX). */
782 proto_ctx->timeout_task =
783 silc_task_register(server->timeout_queue, sock->sock,
784 silc_server_timeout_remote,
785 (void *)server, 15, 0,
789 /* Run the protocol */
790 sock->protocol->execute(server->timeout_queue, 0,
791 sock->protocol, sock->sock, 0, 0);
794 /* Finalizes the connection to router. Registers a server task to the
795 queue so that we can accept new connections. */
797 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
799 SilcProtocol protocol = (SilcProtocol)context;
800 SilcServerConnAuthInternalContext *ctx =
801 (SilcServerConnAuthInternalContext *)protocol->context;
802 SilcServer server = (SilcServer)ctx->server;
803 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
804 SilcSocketConnection sock = ctx->sock;
805 SilcServerEntry id_entry;
807 SilcServerHBContext hb_context;
808 unsigned char *id_string;
809 SilcIDListData idata;
811 SILC_LOG_DEBUG(("Start"));
813 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
814 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
815 /* Error occured during protocol */
817 silc_free(ctx->dest_id);
818 silc_server_disconnect_remote(server, sock, "Server closed connection: "
819 "Authentication failed");
823 /* Add a task to the queue. This task receives new connections to the
824 server. This task remains on the queue until the end of the program. */
825 if (!server->listenning) {
826 silc_task_register(server->io_queue, server->sock,
827 silc_server_accept_new_connection,
828 (void *)server, 0, 0,
830 SILC_TASK_PRI_NORMAL);
831 server->listenning = TRUE;
834 /* Send NEW_SERVER packet to the router. We will become registered
835 to the SILC network after sending this packet. */
836 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
837 packet = silc_buffer_alloc(2 + 2 + SILC_ID_SERVER_LEN +
838 strlen(server->server_name));
839 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
840 silc_buffer_format(packet,
841 SILC_STR_UI_SHORT(SILC_ID_SERVER_LEN),
842 SILC_STR_UI_XNSTRING(id_string, SILC_ID_SERVER_LEN),
843 SILC_STR_UI_SHORT(strlen(server->server_name)),
844 SILC_STR_UI_XNSTRING(server->server_name,
845 strlen(server->server_name)),
848 /* Send the packet */
849 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
850 packet->data, packet->len, TRUE);
851 silc_buffer_free(packet);
852 silc_free(id_string);
854 SILC_LOG_DEBUG(("Connected to router %s", sock->hostname));
856 /* Add the connected router to local server list */
857 server->standalone = FALSE;
858 id_entry = silc_idlist_add_server(server->local_list, sock->hostname,
859 SILC_ROUTER, ctx->dest_id, NULL, sock);
862 silc_free(ctx->dest_id);
863 silc_server_disconnect_remote(server, sock, "Server closed connection: "
864 "Authentication failed");
868 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
869 silc_free(sock->user_data);
870 sock->user_data = (void *)id_entry;
871 sock->type = SILC_SOCKET_TYPE_ROUTER;
872 server->id_entry->router = id_entry;
873 server->router = id_entry;
874 idata = (SilcIDListData)sock->user_data;
875 idata->registered = TRUE;
877 /* Perform keepalive. The `hb_context' will be freed automatically
878 when finally calling the silc_socket_free function. XXX hardcoded
880 hb_context = silc_calloc(1, sizeof(*hb_context));
881 hb_context->server = server;
882 silc_socket_set_heartbeat(sock, 600, hb_context,
883 silc_server_perform_heartbeat,
884 server->timeout_queue);
886 /* Register re-key timeout */
887 idata->rekey->timeout = 3600; /* XXX hardcoded */
888 idata->rekey->context = (void *)server;
889 silc_task_register(server->timeout_queue, sock->sock,
890 silc_server_rekey_callback,
891 (void *)sock, idata->rekey->timeout, 0,
892 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
894 /* If we are router then announce our possible servers. */
895 if (server->server_type == SILC_ROUTER)
896 silc_server_announce_servers(server);
898 /* Announce our clients and channels to the router */
899 silc_server_announce_clients(server);
900 silc_server_announce_channels(server);
903 /* Free the temporary connection data context */
905 silc_free(sconn->remote_host);
909 /* Free the protocol object */
910 silc_protocol_free(protocol);
912 silc_packet_context_free(ctx->packet);
914 silc_ske_free(ctx->ske);
916 sock->protocol = NULL;
919 /* Accepts new connections to the server. Accepting new connections are
920 done in three parts to make it async. */
922 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
924 SilcServer server = (SilcServer)context;
925 SilcSocketConnection newsocket;
926 SilcServerKEInternalContext *proto_ctx;
929 SILC_LOG_DEBUG(("Accepting new connection"));
931 server->stat.conn_attempts++;
933 sock = silc_net_accept_connection(server->sock);
935 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
936 server->stat.conn_failures++;
940 /* Check max connections */
941 if (sock > SILC_SERVER_MAX_CONNECTIONS) {
942 SILC_LOG_ERROR(("Refusing connection, server is full"));
943 server->stat.conn_failures++;
947 /* Set socket options */
948 silc_net_set_socket_nonblock(sock);
949 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
951 /* We don't create a ID yet, since we don't know what type of connection
952 this is yet. But, we do add the connection to the socket table. */
953 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
954 server->sockets[sock] = newsocket;
956 /* XXX This MUST be done async as this will block the entire server
957 process. Either we have to do our own resolver stuff or in the future
958 we can use threads. */
959 /* Perform name and address lookups for the remote host. */
960 silc_net_check_host_by_sock(sock, &newsocket->hostname, &newsocket->ip);
961 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
963 SILC_LOG_ERROR(("IP/DNS lookup failed"));
964 server->stat.conn_failures++;
967 if (!newsocket->hostname)
968 newsocket->hostname = strdup(newsocket->ip);
969 newsocket->port = silc_net_get_remote_port(sock);
971 SILC_LOG_INFO(("Incoming connection from %s (%s)", newsocket->hostname,
974 /* Allocate internal context for key exchange protocol. This is
975 sent as context for the protocol. */
976 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
977 proto_ctx->server = context;
978 proto_ctx->sock = newsocket;
979 proto_ctx->rng = server->rng;
980 proto_ctx->responder = TRUE;
982 /* Prepare the connection for key exchange protocol. We allocate the
983 protocol but will not start it yet. The connector will be the
984 initiator of the protocol thus we will wait for initiation from
985 there before we start the protocol. */
986 server->stat.auth_attempts++;
987 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
988 &newsocket->protocol, proto_ctx,
989 silc_server_accept_new_connection_second);
991 /* Register a timeout task that will be executed if the connector
992 will not start the key exchange protocol within 60 seconds. For
993 now, this is a hard coded limit. After 60 secs the connection will
994 be closed if the key exchange protocol has not been started. */
995 proto_ctx->timeout_task =
996 silc_task_register(server->timeout_queue, newsocket->sock,
997 silc_server_timeout_remote,
1002 /* Register the connection for network input and output. This sets
1003 that scheduler will listen for incoming packets for this connection
1004 and sets that outgoing packets may be sent to this connection as well.
1005 However, this doesn't set the scheduler for outgoing traffic, it
1006 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1007 later when outgoing data is available. */
1008 SILC_REGISTER_CONNECTION_FOR_IO(sock);
1011 /* Second part of accepting new connection. Key exchange protocol has been
1012 performed and now it is time to do little connection authentication
1013 protocol to figure out whether this connection is client or server
1014 and whether it has right to access this server (especially server
1015 connections needs to be authenticated). */
1017 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1019 SilcProtocol protocol = (SilcProtocol)context;
1020 SilcServerKEInternalContext *ctx =
1021 (SilcServerKEInternalContext *)protocol->context;
1022 SilcServer server = (SilcServer)ctx->server;
1023 SilcSocketConnection sock = server->sockets[fd];
1024 SilcServerConnAuthInternalContext *proto_ctx;
1026 SILC_LOG_DEBUG(("Start"));
1028 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1029 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1030 /* Error occured during protocol */
1031 silc_protocol_free(protocol);
1032 sock->protocol = NULL;
1033 silc_ske_free_key_material(ctx->keymat);
1035 silc_packet_context_free(ctx->packet);
1037 silc_ske_free(ctx->ske);
1039 silc_free(ctx->dest_id);
1041 silc_task_unregister_by_callback(server->timeout_queue,
1042 silc_server_failure_callback);
1043 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1044 "Key exchange failed");
1045 server->stat.auth_failures++;
1049 /* We now have the key material as the result of the key exchange
1050 protocol. Take the key material into use. Free the raw key material
1051 as soon as we've set them into use. */
1052 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
1053 ctx->ske->prop->cipher,
1054 ctx->ske->prop->pkcs,
1055 ctx->ske->prop->hash,
1056 ctx->ske->prop->hmac,
1057 ctx->ske->prop->group,
1059 silc_protocol_free(protocol);
1060 sock->protocol = NULL;
1061 silc_ske_free_key_material(ctx->keymat);
1063 silc_packet_context_free(ctx->packet);
1065 silc_ske_free(ctx->ske);
1067 silc_free(ctx->dest_id);
1069 silc_task_unregister_by_callback(server->timeout_queue,
1070 silc_server_failure_callback);
1071 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1072 "Key exchange failed");
1073 server->stat.auth_failures++;
1076 silc_ske_free_key_material(ctx->keymat);
1078 /* Allocate internal context for the authentication protocol. This
1079 is sent as context for the protocol. */
1080 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1081 proto_ctx->server = (void *)server;
1082 proto_ctx->sock = sock;
1083 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
1084 proto_ctx->responder = TRUE;
1085 proto_ctx->dest_id_type = ctx->dest_id_type;
1086 proto_ctx->dest_id = ctx->dest_id;
1088 /* Free old protocol as it is finished now */
1089 silc_protocol_free(protocol);
1091 silc_packet_context_free(ctx->packet);
1093 sock->protocol = NULL;
1095 /* Allocate the authentication protocol. This is allocated here
1096 but we won't start it yet. We will be receiving party of this
1097 protocol thus we will wait that connecting party will make
1098 their first move. */
1099 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1100 &sock->protocol, proto_ctx,
1101 silc_server_accept_new_connection_final);
1103 /* Register timeout task. If the protocol is not executed inside
1104 this timelimit the connection will be terminated. Currently
1105 this is 60 seconds and is hard coded limit (XXX). */
1106 proto_ctx->timeout_task =
1107 silc_task_register(server->timeout_queue, sock->sock,
1108 silc_server_timeout_remote,
1109 (void *)server, 60, 0,
1114 /* Final part of accepting new connection. The connection has now
1115 been authenticated and keys has been exchanged. We also know whether
1116 this is client or server connection. */
1118 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1120 SilcProtocol protocol = (SilcProtocol)context;
1121 SilcServerConnAuthInternalContext *ctx =
1122 (SilcServerConnAuthInternalContext *)protocol->context;
1123 SilcServer server = (SilcServer)ctx->server;
1124 SilcSocketConnection sock = ctx->sock;
1125 SilcServerHBContext hb_context;
1126 void *id_entry = NULL;
1128 SILC_LOG_DEBUG(("Start"));
1130 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1131 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1132 /* Error occured during protocol */
1133 silc_protocol_free(protocol);
1134 sock->protocol = NULL;
1136 silc_packet_context_free(ctx->packet);
1138 silc_ske_free(ctx->ske);
1140 silc_free(ctx->dest_id);
1143 sock->protocol = NULL;
1144 silc_task_unregister_by_callback(server->timeout_queue,
1145 silc_server_failure_callback);
1146 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1147 "Authentication failed");
1148 server->stat.auth_failures++;
1152 sock->type = ctx->conn_type;
1153 switch(sock->type) {
1154 case SILC_SOCKET_TYPE_CLIENT:
1156 SilcClientEntry client;
1158 SILC_LOG_DEBUG(("Remote host is client"));
1159 SILC_LOG_INFO(("Connection from %s (%s) is client", sock->hostname,
1162 /* Add the client to the client ID cache. The nickname and Client ID
1163 and other information is created after we have received NEW_CLIENT
1164 packet from client. */
1165 client = silc_idlist_add_client(server->local_list,
1166 NULL, 0, NULL, NULL, NULL, NULL, sock);
1168 SILC_LOG_ERROR(("Could not add new client to cache"));
1169 silc_free(sock->user_data);
1174 server->stat.my_clients++;
1175 server->stat.clients++;
1176 if (server->server_type == SILC_ROUTER)
1177 server->stat.cell_clients++;
1179 id_entry = (void *)client;
1182 case SILC_SOCKET_TYPE_SERVER:
1183 case SILC_SOCKET_TYPE_ROUTER:
1185 SilcServerEntry new_server;
1187 SILC_LOG_DEBUG(("Remote host is %s",
1188 sock->type == SILC_SOCKET_TYPE_SERVER ?
1189 "server" : "router"));
1190 SILC_LOG_INFO(("Connection from %s (%s) is %s", sock->hostname,
1191 sock->ip, sock->type == SILC_SOCKET_TYPE_SERVER ?
1192 "server" : "router"));
1194 /* Add the server into server cache. The server name and Server ID
1195 is updated after we have received NEW_SERVER packet from the
1196 server. We mark ourselves as router for this server if we really
1199 silc_idlist_add_server(server->local_list, NULL,
1200 sock->type == SILC_SOCKET_TYPE_SERVER ?
1201 SILC_SERVER : SILC_ROUTER, NULL,
1202 sock->type == SILC_SOCKET_TYPE_SERVER ?
1203 server->id_entry : NULL, sock);
1205 SILC_LOG_ERROR(("Could not add new server to cache"));
1206 silc_free(sock->user_data);
1211 if (sock->type == SILC_SOCKET_TYPE_SERVER)
1212 server->stat.my_servers++;
1214 server->stat.my_routers++;
1215 server->stat.servers++;
1217 id_entry = (void *)new_server;
1219 /* There is connection to other server now, if it is router then
1220 we will have connection to outside world. If we are router but
1221 normal server connected to us then we will remain standalone,
1222 if we are standlone. */
1223 if (server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER) {
1224 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1225 server->standalone = FALSE;
1226 if (!server->id_entry->router) {
1227 server->id_entry->router = id_entry;
1228 server->router = id_entry;
1237 /* Add the common data structure to the ID entry. */
1239 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1241 /* Add to sockets internal pointer for fast referencing */
1242 silc_free(sock->user_data);
1243 sock->user_data = id_entry;
1245 /* Connection has been fully established now. Everything is ok. */
1246 SILC_LOG_DEBUG(("New connection authenticated"));
1248 /* Perform keepalive. The `hb_context' will be freed automatically
1249 when finally calling the silc_socket_free function. XXX hardcoded
1251 hb_context = silc_calloc(1, sizeof(*hb_context));
1252 hb_context->server = server;
1253 silc_socket_set_heartbeat(sock, 600, hb_context,
1254 silc_server_perform_heartbeat,
1255 server->timeout_queue);
1257 silc_task_unregister_by_callback(server->timeout_queue,
1258 silc_server_failure_callback);
1259 silc_protocol_free(protocol);
1261 silc_packet_context_free(ctx->packet);
1263 silc_ske_free(ctx->ske);
1265 silc_free(ctx->dest_id);
1267 sock->protocol = NULL;
1270 /* This function is used to read packets from network and send packets to
1271 network. This is usually a generic task. */
1273 SILC_TASK_CALLBACK(silc_server_packet_process)
1275 SilcServer server = (SilcServer)context;
1276 SilcSocketConnection sock = server->sockets[fd];
1277 SilcIDListData idata;
1278 SilcCipher cipher = NULL;
1279 SilcHmac hmac = NULL;
1285 SILC_LOG_DEBUG(("Processing packet"));
1287 /* Packet sending */
1289 if (type == SILC_TASK_WRITE) {
1290 /* Do not send data to disconnected connection */
1291 if (SILC_IS_DISCONNECTED(sock))
1294 server->stat.packets_sent++;
1296 if (sock->outbuf->data - sock->outbuf->head)
1297 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1299 ret = silc_server_packet_send_real(server, sock, TRUE);
1301 /* If returned -2 could not write to connection now, will do
1309 /* The packet has been sent and now it is time to set the connection
1310 back to only for input. When there is again some outgoing data
1311 available for this connection it will be set for output as well.
1312 This call clears the output setting and sets it only for input. */
1313 SILC_SET_CONNECTION_FOR_INPUT(fd);
1314 SILC_UNSET_OUTBUF_PENDING(sock);
1316 silc_buffer_clear(sock->outbuf);
1320 /* Packet receiving */
1322 /* Read some data from connection */
1323 ret = silc_packet_receive(sock);
1329 SILC_LOG_DEBUG(("Read EOF"));
1331 /* If connection is disconnecting already we will finally
1332 close the connection */
1333 if (SILC_IS_DISCONNECTING(sock)) {
1334 if (sock->user_data)
1335 silc_server_free_sock_user_data(server, sock);
1336 silc_server_close_connection(server, sock);
1340 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1341 SILC_SET_DISCONNECTING(sock);
1343 /* If the closed connection was our primary router connection the
1344 start re-connecting phase. */
1345 if (!server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER &&
1346 sock == server->router->connection)
1347 silc_task_register(server->timeout_queue, 0,
1348 silc_server_connect_to_router,
1351 SILC_TASK_PRI_NORMAL);
1353 if (sock->user_data)
1354 silc_server_free_sock_user_data(server, sock);
1355 silc_server_close_connection(server, sock);
1359 /* If connection is disconnecting or disconnected we will ignore
1361 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1362 SILC_LOG_DEBUG(("Ignoring read data from disonnected connection"));
1366 server->stat.packets_received++;
1368 /* Get keys and stuff from ID entry */
1369 idata = (SilcIDListData)sock->user_data;
1371 idata->last_receive = time(NULL);
1372 cipher = idata->receive_key;
1376 /* Process the packet. This will call the parser that will then
1377 decrypt and parse the packet. */
1378 silc_packet_receive_process(sock, cipher, hmac, silc_server_packet_parse,
1382 /* Callback function that the silc_packet_decrypt will call to make the
1383 decision whether the packet is normal or special packet. We will
1384 return TRUE if it is normal and FALSE if it is special */
1386 static int silc_server_packet_decrypt_check(SilcPacketType packet_type,
1388 SilcPacketContext *packet,
1391 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1392 SilcServer server = (SilcServer)parse_ctx->context;
1394 /* Packet is normal packet, if:
1396 1) packet is private message packet and does not have private key set
1397 2) is other packet than channel message packet
1398 3) is channel message packet and remote is router and we are router
1400 all other packets are special packets
1403 if (packet_type == SILC_PACKET_PRIVATE_MESSAGE &&
1404 (buffer->data[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
1407 if (packet_type != SILC_PACKET_CHANNEL_MESSAGE ||
1408 (packet_type == SILC_PACKET_CHANNEL_MESSAGE &&
1409 parse_ctx->sock->type == SILC_SOCKET_TYPE_ROUTER &&
1410 server->server_type == SILC_ROUTER))
1416 /* Parses whole packet, received earlier. */
1418 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1420 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1421 SilcServer server = (SilcServer)parse_ctx->context;
1422 SilcSocketConnection sock = parse_ctx->sock;
1423 SilcPacketContext *packet = parse_ctx->packet;
1426 SILC_LOG_DEBUG(("Start"));
1428 /* Decrypt the received packet */
1429 ret = silc_packet_decrypt(parse_ctx->cipher, parse_ctx->hmac,
1430 packet->buffer, packet,
1431 silc_server_packet_decrypt_check, parse_ctx);
1436 /* Parse the packet. Packet type is returned. */
1437 ret = silc_packet_parse(packet);
1439 /* Parse the packet header in special way as this is "special"
1441 ret = silc_packet_parse_special(packet);
1444 if (ret == SILC_PACKET_NONE)
1447 /* Check that the the current client ID is same as in the client's packet. */
1448 if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
1449 SilcClientEntry client = (SilcClientEntry)sock->user_data;
1450 if (client && client->id) {
1451 void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
1452 packet->src_id_type);
1453 if (SILC_ID_CLIENT_COMPARE(client->id, id)) {
1461 if (server->server_type == SILC_ROUTER) {
1462 /* Route the packet if it is not destined to us. Other ID types but
1463 server are handled separately after processing them. */
1464 if (packet->dst_id_type == SILC_ID_SERVER &&
1465 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1466 SILC_ID_SERVER_COMPARE(packet->dst_id, server->id_string)) {
1468 /* Route the packet to fastest route for the destination ID */
1469 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
1470 packet->dst_id_type);
1473 silc_server_packet_route(server,
1474 silc_server_route_get(server, id,
1475 packet->dst_id_type),
1481 /* Broadcast packet if it is marked as broadcast packet and it is
1482 originated from router and we are router. */
1483 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1484 packet->flags & SILC_PACKET_FLAG_BROADCAST) {
1485 silc_server_packet_broadcast(server, server->router->connection, packet);
1489 /* Parse the incoming packet type */
1490 silc_server_packet_parse_type(server, sock, packet);
1493 /* silc_buffer_clear(sock->inbuf); */
1494 silc_packet_context_free(packet);
1495 silc_free(parse_ctx);
1498 /* Parser callback called by silc_packet_receive_process. This merely
1499 registers timeout that will handle the actual parsing when appropriate. */
1501 void silc_server_packet_parse(SilcPacketParserContext *parser_context)
1503 SilcServer server = (SilcServer)parser_context->context;
1504 SilcSocketConnection sock = parser_context->sock;
1506 switch (sock->type) {
1507 case SILC_SOCKET_TYPE_CLIENT:
1508 case SILC_SOCKET_TYPE_UNKNOWN:
1509 /* Parse the packet with timeout */
1510 silc_task_register(server->timeout_queue, sock->sock,
1511 silc_server_packet_parse_real,
1512 (void *)parser_context, 0, 100000,
1514 SILC_TASK_PRI_NORMAL);
1516 case SILC_SOCKET_TYPE_SERVER:
1517 case SILC_SOCKET_TYPE_ROUTER:
1518 /* Packets from servers are parsed as soon as possible */
1519 silc_task_register(server->timeout_queue, sock->sock,
1520 silc_server_packet_parse_real,
1521 (void *)parser_context, 0, 1,
1523 SILC_TASK_PRI_NORMAL);
1530 /* Parses the packet type and calls what ever routines the packet type
1531 requires. This is done for all incoming packets. */
1533 void silc_server_packet_parse_type(SilcServer server,
1534 SilcSocketConnection sock,
1535 SilcPacketContext *packet)
1537 SilcPacketType type = packet->type;
1539 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1541 /* Parse the packet type */
1543 case SILC_PACKET_DISCONNECT:
1544 SILC_LOG_DEBUG(("Disconnect packet"));
1545 if (packet->flags & SILC_PACKET_FLAG_LIST)
1549 case SILC_PACKET_SUCCESS:
1551 * Success received for something. For now we can have only
1552 * one protocol for connection executing at once hence this
1553 * success message is for whatever protocol is executing currently.
1555 SILC_LOG_DEBUG(("Success packet"));
1556 if (packet->flags & SILC_PACKET_FLAG_LIST)
1558 if (sock->protocol) {
1559 sock->protocol->execute(server->timeout_queue, 0,
1560 sock->protocol, sock->sock, 0, 0);
1564 case SILC_PACKET_FAILURE:
1566 * Failure received for something. For now we can have only
1567 * one protocol for connection executing at once hence this
1568 * failure message is for whatever protocol is executing currently.
1570 SILC_LOG_DEBUG(("Failure packet"));
1571 if (packet->flags & SILC_PACKET_FLAG_LIST)
1573 if (sock->protocol) {
1574 SilcServerFailureContext f;
1575 f = silc_calloc(1, sizeof(*f));
1579 /* We will wait 5 seconds to process this failure packet */
1580 silc_task_register(server->timeout_queue, sock->sock,
1581 silc_server_failure_callback, (void *)f, 5, 0,
1582 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1586 case SILC_PACKET_REJECT:
1587 SILC_LOG_DEBUG(("Reject packet"));
1588 if (packet->flags & SILC_PACKET_FLAG_LIST)
1593 case SILC_PACKET_NOTIFY:
1595 * Received notify packet. Server can receive notify packets from
1596 * router. Server then relays the notify messages to clients if needed.
1598 SILC_LOG_DEBUG(("Notify packet"));
1599 if (packet->flags & SILC_PACKET_FLAG_LIST)
1600 silc_server_notify_list(server, sock, packet);
1602 silc_server_notify(server, sock, packet);
1608 case SILC_PACKET_CHANNEL_MESSAGE:
1610 * Received channel message. Channel messages are special packets
1611 * (although probably most common ones) thus they are handled
1614 SILC_LOG_DEBUG(("Channel Message packet"));
1615 if (packet->flags & SILC_PACKET_FLAG_LIST)
1617 silc_server_channel_message(server, sock, packet);
1620 case SILC_PACKET_CHANNEL_KEY:
1622 * Received key for channel. As channels are created by the router
1623 * the keys are as well. We will distribute the key to all of our
1624 * locally connected clients on the particular channel. Router
1625 * never receives this channel and thus is ignored.
1627 SILC_LOG_DEBUG(("Channel Key packet"));
1628 if (packet->flags & SILC_PACKET_FLAG_LIST)
1630 silc_server_channel_key(server, sock, packet);
1636 case SILC_PACKET_COMMAND:
1638 * Recived command. Processes the command request and allocates the
1639 * command context and calls the command.
1641 SILC_LOG_DEBUG(("Command packet"));
1642 if (packet->flags & SILC_PACKET_FLAG_LIST)
1644 silc_server_command_process(server, sock, packet);
1647 case SILC_PACKET_COMMAND_REPLY:
1649 * Received command reply packet. Received command reply to command. It
1650 * may be reply to command sent by us or reply to command sent by client
1651 * that we've routed further.
1653 SILC_LOG_DEBUG(("Command Reply packet"));
1654 if (packet->flags & SILC_PACKET_FLAG_LIST)
1656 silc_server_command_reply(server, sock, packet);
1660 * Private Message packets
1662 case SILC_PACKET_PRIVATE_MESSAGE:
1664 * Received private message packet. The packet is coming from either
1667 SILC_LOG_DEBUG(("Private Message packet"));
1668 if (packet->flags & SILC_PACKET_FLAG_LIST)
1670 silc_server_private_message(server, sock, packet);
1673 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1675 * Private message key packet.
1677 if (packet->flags & SILC_PACKET_FLAG_LIST)
1679 silc_server_private_message_key(server, sock, packet);
1683 * Key Exchange protocol packets
1685 case SILC_PACKET_KEY_EXCHANGE:
1686 SILC_LOG_DEBUG(("KE packet"));
1687 if (packet->flags & SILC_PACKET_FLAG_LIST)
1690 if (sock->protocol && sock->protocol->protocol &&
1691 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1693 SilcServerKEInternalContext *proto_ctx =
1694 (SilcServerKEInternalContext *)sock->protocol->context;
1696 proto_ctx->packet = silc_packet_context_dup(packet);
1698 /* Let the protocol handle the packet */
1699 sock->protocol->execute(server->timeout_queue, 0,
1700 sock->protocol, sock->sock, 0, 100000);
1702 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1703 "protocol active, packet dropped."));
1705 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1709 case SILC_PACKET_KEY_EXCHANGE_1:
1710 SILC_LOG_DEBUG(("KE 1 packet"));
1711 if (packet->flags & SILC_PACKET_FLAG_LIST)
1714 if (sock->protocol && sock->protocol->protocol &&
1715 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1716 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1718 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1719 SilcServerRekeyInternalContext *proto_ctx =
1720 (SilcServerRekeyInternalContext *)sock->protocol->context;
1722 if (proto_ctx->packet)
1723 silc_packet_context_free(proto_ctx->packet);
1725 proto_ctx->packet = silc_packet_context_dup(packet);
1727 /* Let the protocol handle the packet */
1728 sock->protocol->execute(server->timeout_queue, 0,
1729 sock->protocol, sock->sock, 0, 0);
1731 SilcServerKEInternalContext *proto_ctx =
1732 (SilcServerKEInternalContext *)sock->protocol->context;
1734 if (proto_ctx->packet)
1735 silc_packet_context_free(proto_ctx->packet);
1737 proto_ctx->packet = silc_packet_context_dup(packet);
1738 proto_ctx->dest_id_type = packet->src_id_type;
1739 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1740 packet->src_id_type);
1741 if (!proto_ctx->dest_id)
1744 /* Let the protocol handle the packet */
1745 sock->protocol->execute(server->timeout_queue, 0,
1746 sock->protocol, sock->sock,
1750 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1751 "protocol active, packet dropped."));
1755 case SILC_PACKET_KEY_EXCHANGE_2:
1756 SILC_LOG_DEBUG(("KE 2 packet"));
1757 if (packet->flags & SILC_PACKET_FLAG_LIST)
1760 if (sock->protocol && sock->protocol->protocol &&
1761 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1762 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1764 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1765 SilcServerRekeyInternalContext *proto_ctx =
1766 (SilcServerRekeyInternalContext *)sock->protocol->context;
1768 if (proto_ctx->packet)
1769 silc_packet_context_free(proto_ctx->packet);
1771 proto_ctx->packet = silc_packet_context_dup(packet);
1773 /* Let the protocol handle the packet */
1774 sock->protocol->execute(server->timeout_queue, 0,
1775 sock->protocol, sock->sock, 0, 0);
1777 SilcServerKEInternalContext *proto_ctx =
1778 (SilcServerKEInternalContext *)sock->protocol->context;
1780 if (proto_ctx->packet)
1781 silc_packet_context_free(proto_ctx->packet);
1783 proto_ctx->packet = silc_packet_context_dup(packet);
1784 proto_ctx->dest_id_type = packet->src_id_type;
1785 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1786 packet->src_id_type);
1787 if (!proto_ctx->dest_id)
1790 /* Let the protocol handle the packet */
1791 sock->protocol->execute(server->timeout_queue, 0,
1792 sock->protocol, sock->sock,
1796 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
1797 "protocol active, packet dropped."));
1801 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
1803 * Connection authentication request packet. When we receive this packet
1804 * we will send to the other end information about our mandatory
1805 * authentication method for the connection. This packet maybe received
1808 SILC_LOG_DEBUG(("Connection authentication request packet"));
1809 if (packet->flags & SILC_PACKET_FLAG_LIST)
1811 silc_server_connection_auth_request(server, sock, packet);
1815 * Connection Authentication protocol packets
1817 case SILC_PACKET_CONNECTION_AUTH:
1818 /* Start of the authentication protocol. We receive here the
1819 authentication data and will verify it. */
1820 SILC_LOG_DEBUG(("Connection auth packet"));
1821 if (packet->flags & SILC_PACKET_FLAG_LIST)
1824 if (sock->protocol && sock->protocol->protocol->type
1825 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
1827 SilcServerConnAuthInternalContext *proto_ctx =
1828 (SilcServerConnAuthInternalContext *)sock->protocol->context;
1830 proto_ctx->packet = silc_packet_context_dup(packet);
1832 /* Let the protocol handle the packet */
1833 sock->protocol->execute(server->timeout_queue, 0,
1834 sock->protocol, sock->sock, 0, 0);
1836 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1837 "protocol active, packet dropped."));
1841 case SILC_PACKET_NEW_ID:
1843 * Received New ID packet. This includes some new ID that has been
1844 * created. It may be for client, server or channel. This is the way
1845 * to distribute information about new registered entities in the
1848 SILC_LOG_DEBUG(("New ID packet"));
1849 if (packet->flags & SILC_PACKET_FLAG_LIST)
1850 silc_server_new_id_list(server, sock, packet);
1852 silc_server_new_id(server, sock, packet);
1855 case SILC_PACKET_NEW_CLIENT:
1857 * Received new client packet. This includes client information that
1858 * we will use to create initial client ID. After creating new
1859 * ID we will send it to the client.
1861 SILC_LOG_DEBUG(("New Client packet"));
1862 if (packet->flags & SILC_PACKET_FLAG_LIST)
1864 silc_server_new_client(server, sock, packet);
1867 case SILC_PACKET_NEW_SERVER:
1869 * Received new server packet. This includes Server ID and some other
1870 * information that we may save. This is received after server has
1873 SILC_LOG_DEBUG(("New Server packet"));
1874 if (packet->flags & SILC_PACKET_FLAG_LIST)
1876 silc_server_new_server(server, sock, packet);
1879 case SILC_PACKET_NEW_CHANNEL:
1881 * Received new channel packet. Information about new channel in the
1882 * network are distributed using this packet.
1884 SILC_LOG_DEBUG(("New Channel packet"));
1885 if (packet->flags & SILC_PACKET_FLAG_LIST)
1886 silc_server_new_channel_list(server, sock, packet);
1888 silc_server_new_channel(server, sock, packet);
1891 case SILC_PACKET_HEARTBEAT:
1893 * Received heartbeat.
1895 SILC_LOG_DEBUG(("Heartbeat packet"));
1896 if (packet->flags & SILC_PACKET_FLAG_LIST)
1900 case SILC_PACKET_KEY_AGREEMENT:
1902 * Received heartbeat.
1904 SILC_LOG_DEBUG(("Key agreement packet"));
1905 if (packet->flags & SILC_PACKET_FLAG_LIST)
1907 silc_server_key_agreement(server, sock, packet);
1910 case SILC_PACKET_REKEY:
1912 * Received re-key packet. The sender wants to regenerate the session
1915 SILC_LOG_DEBUG(("Re-key packet"));
1916 if (packet->flags & SILC_PACKET_FLAG_LIST)
1918 silc_server_rekey(server, sock, packet);
1921 case SILC_PACKET_REKEY_DONE:
1923 * The re-key is done.
1925 SILC_LOG_DEBUG(("Re-key done packet"));
1926 if (packet->flags & SILC_PACKET_FLAG_LIST)
1929 if (sock->protocol && sock->protocol->protocol &&
1930 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1932 SilcServerRekeyInternalContext *proto_ctx =
1933 (SilcServerRekeyInternalContext *)sock->protocol->context;
1935 if (proto_ctx->packet)
1936 silc_packet_context_free(proto_ctx->packet);
1938 proto_ctx->packet = silc_packet_context_dup(packet);
1940 /* Let the protocol handle the packet */
1941 sock->protocol->execute(server->timeout_queue, 0,
1942 sock->protocol, sock->sock,
1945 SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
1946 "protocol active, packet dropped."));
1951 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
1957 /* Creates connection to a remote router. */
1959 void silc_server_create_connection(SilcServer server,
1960 char *remote_host, uint32 port)
1962 SilcServerConnection sconn;
1964 /* Allocate connection object for hold connection specific stuff. */
1965 sconn = silc_calloc(1, sizeof(*sconn));
1966 sconn->server = server;
1967 sconn->remote_host = strdup(remote_host);
1968 sconn->remote_port = port;
1970 silc_task_register(server->timeout_queue, 0,
1971 silc_server_connect_router,
1972 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
1973 SILC_TASK_PRI_NORMAL);
1976 SILC_TASK_CALLBACK(silc_server_close_connection_final)
1978 silc_socket_free((SilcSocketConnection)context);
1981 /* Closes connection to socket connection */
1983 void silc_server_close_connection(SilcServer server,
1984 SilcSocketConnection sock)
1986 SILC_LOG_DEBUG(("Closing connection %d", sock->sock));
1988 /* We won't listen for this connection anymore */
1989 silc_schedule_unset_listen_fd(sock->sock);
1991 /* Unregister all tasks */
1992 silc_task_unregister_by_fd(server->io_queue, sock->sock);
1993 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
1995 /* Close the actual connection */
1996 silc_net_close_connection(sock->sock);
1997 server->sockets[sock->sock] = NULL;
1999 silc_task_register(server->timeout_queue, 0,
2000 silc_server_close_connection_final,
2001 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2002 SILC_TASK_PRI_NORMAL);
2005 /* Sends disconnect message to remote connection and disconnects the
2008 void silc_server_disconnect_remote(SilcServer server,
2009 SilcSocketConnection sock,
2010 const char *fmt, ...)
2013 unsigned char buf[4096];
2018 memset(buf, 0, sizeof(buf));
2020 vsprintf(buf, fmt, ap);
2023 SILC_LOG_DEBUG(("Disconnecting remote host"));
2025 SILC_LOG_INFO(("Disconnecting %s:%d [%s]", sock->hostname,
2027 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2028 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2029 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2032 /* Notify remote end that the conversation is over. The notify message
2033 is tried to be sent immediately. */
2034 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
2035 buf, strlen(buf), TRUE);
2037 /* Mark the connection to be disconnected */
2038 SILC_SET_DISCONNECTED(sock);
2039 silc_server_close_connection(server, sock);
2044 SilcClientEntry client;
2045 } *FreeClientInternal;
2047 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2049 FreeClientInternal i = (FreeClientInternal)context;
2051 silc_idlist_del_data(i->client);
2052 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2056 /* Frees client data and notifies about client's signoff. */
2058 void silc_server_free_client_data(SilcServer server,
2059 SilcSocketConnection sock,
2060 SilcClientEntry client,
2064 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2066 /* If there is pending outgoing data for the client then purge it
2067 to the network before removing the client entry. */
2068 if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
2069 (SILC_IS_DISCONNECTED(sock) == FALSE)) {
2070 server->stat.packets_sent++;
2072 if (sock->outbuf->data - sock->outbuf->head)
2073 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
2075 silc_server_packet_send_real(server, sock, TRUE);
2077 SILC_SET_CONNECTION_FOR_INPUT(sock->sock);
2078 SILC_UNSET_OUTBUF_PENDING(sock);
2079 silc_buffer_clear(sock->outbuf);
2082 /* Send SIGNOFF notify to routers. */
2083 if (notify && !server->standalone && server->router)
2084 silc_server_send_notify_signoff(server, server->router->connection,
2085 server->server_type == SILC_SERVER ?
2086 FALSE : TRUE, client->id,
2087 SILC_ID_CLIENT_LEN, signoff);
2089 /* Remove client from all channels */
2091 silc_server_remove_from_channels(server, NULL, client,
2092 TRUE, signoff, TRUE);
2094 silc_server_remove_from_channels(server, NULL, client,
2095 FALSE, NULL, FALSE);
2097 /* We will not delete the client entry right away. We will take it
2098 into history (for WHOWAS command) for 5 minutes */
2101 silc_task_register(server->timeout_queue, 0,
2102 silc_server_free_client_data_timeout,
2104 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2105 client->data.registered = FALSE;
2107 /* Free the client entry and everything in it */
2108 server->stat.my_clients--;
2109 server->stat.clients--;
2110 if (server->server_type == SILC_ROUTER)
2111 server->stat.cell_clients--;
2114 /* Frees user_data pointer from socket connection object. This also sends
2115 appropriate notify packets to the network to inform about leaving
2118 void silc_server_free_sock_user_data(SilcServer server,
2119 SilcSocketConnection sock)
2121 SILC_LOG_DEBUG(("Start"));
2123 switch(sock->type) {
2124 case SILC_SOCKET_TYPE_CLIENT:
2126 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2127 silc_server_free_client_data(server, sock, user_data, TRUE, NULL);
2130 case SILC_SOCKET_TYPE_SERVER:
2131 case SILC_SOCKET_TYPE_ROUTER:
2133 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2135 /* Free all client entries that this server owns as they will
2136 become invalid now as well. */
2137 silc_server_remove_clients_by_server(server, user_data, TRUE);
2139 /* If this was our primary router connection then we're lost to
2140 the outside world. */
2141 if (server->router == user_data) {
2142 server->id_entry->router = NULL;
2143 server->router = NULL;
2144 server->standalone = TRUE;
2147 /* Free the server entry */
2148 silc_idlist_del_data(user_data);
2149 silc_idlist_del_server(server->local_list, user_data);
2150 server->stat.my_servers--;
2151 server->stat.servers--;
2152 if (server->server_type == SILC_ROUTER)
2153 server->stat.cell_servers--;
2158 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2160 silc_idlist_del_data(user_data);
2161 silc_free(user_data);
2166 sock->user_data = NULL;
2169 /* This function is used to remove all client entries by the server `entry'.
2170 This is called when the connection is lost to the server. In this case
2171 we must invalidate all the client entries owned by the server `entry'.
2172 If the `server_signoff' is TRUE then the SERVER_SIGNOFF notify is
2173 distributed to our local clients. */
2175 int silc_server_remove_clients_by_server(SilcServer server,
2176 SilcServerEntry entry,
2179 SilcIDCacheList list = NULL;
2180 SilcIDCacheEntry id_cache = NULL;
2181 SilcClientEntry client = NULL;
2183 SilcClientEntry *clients = NULL;
2184 uint32 clients_c = 0;
2185 unsigned char **argv = NULL;
2186 uint32 *argv_lens = NULL, *argv_types = NULL, argc = 0;
2189 SILC_LOG_DEBUG(("Start"));
2191 if (server_signoff) {
2192 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2193 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2194 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) * (argc + 1));
2195 argv_types = silc_realloc(argv_types, sizeof(*argv_types) * (argc + 1));
2196 argv[argc] = idp->data;
2197 argv_lens[argc] = idp->len;
2198 argv_types[argc] = argc + 1;
2200 silc_buffer_free(idp);
2203 if (silc_idcache_find_by_id(server->local_list->clients,
2204 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2206 if (silc_idcache_list_first(list, &id_cache)) {
2208 client = (SilcClientEntry)id_cache->context;
2209 if (client->data.registered == FALSE) {
2210 if (!silc_idcache_list_next(list, &id_cache))
2216 if (client->router != entry) {
2217 if (server_signoff && client->connection) {
2218 clients = silc_realloc(clients,
2219 sizeof(*clients) * (clients_c + 1));
2220 clients[clients_c] = client;
2224 if (!silc_idcache_list_next(list, &id_cache))
2230 if (server_signoff) {
2231 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2232 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2233 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2235 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2237 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2238 memcpy(argv[argc], idp->data, idp->len);
2239 argv_lens[argc] = idp->len;
2240 argv_types[argc] = argc + 1;
2242 silc_buffer_free(idp);
2245 /* Remove the client entry */
2246 silc_server_remove_from_channels(server, NULL, client, FALSE,
2248 silc_idlist_del_client(server->local_list, client);
2250 if (!silc_idcache_list_next(list, &id_cache))
2254 silc_idcache_list_free(list);
2257 if (silc_idcache_find_by_id(server->global_list->clients,
2258 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2260 if (silc_idcache_list_first(list, &id_cache)) {
2262 client = (SilcClientEntry)id_cache->context;
2263 if (client->data.registered == FALSE) {
2264 if (!silc_idcache_list_next(list, &id_cache))
2270 if (client->router != entry) {
2271 if (server_signoff && client->connection) {
2272 clients = silc_realloc(clients,
2273 sizeof(*clients) * (clients_c + 1));
2274 clients[clients_c] = client;
2278 if (!silc_idcache_list_next(list, &id_cache))
2284 if (server_signoff) {
2285 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2286 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2287 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2289 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2291 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2292 memcpy(argv[argc], idp->data, idp->len);
2293 argv_lens[argc] = idp->len;
2294 argv_types[argc] = argc + 1;
2296 silc_buffer_free(idp);
2299 /* Remove the client entry */
2300 silc_server_remove_from_channels(server, NULL, client, FALSE,
2302 silc_idlist_del_client(server->global_list, client);
2304 if (!silc_idcache_list_next(list, &id_cache))
2308 silc_idcache_list_free(list);
2311 /* Send the SERVER_SIGNOFF notify */
2312 if (server_signoff) {
2315 /* Send SERVER_SIGNOFF notify to our primary router */
2316 if (!server->standalone && server->router) {
2317 args = silc_argument_payload_encode(1, argv, argv_lens,
2319 silc_server_send_notify_args(server,
2320 server->router->connection,
2321 server->server_type ==
2322 SILC_SERVER ? FALSE : TRUE,
2323 SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2325 silc_buffer_free(args);
2328 args = silc_argument_payload_encode(argc, argv, argv_lens,
2330 /* Send to local clients */
2331 for (i = 0; i < clients_c; i++) {
2332 silc_server_send_notify_args(server, clients[i]->connection,
2333 FALSE, SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2338 silc_buffer_free(args);
2340 silc_free(argv_lens);
2341 silc_free(argv_types);
2347 /* Checks whether given channel has global users. If it does this returns
2348 TRUE and FALSE if there is only locally connected clients on the channel. */
2350 int silc_server_channel_has_global(SilcChannelEntry channel)
2352 SilcChannelClientEntry chl;
2354 silc_list_start(channel->user_list);
2355 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2356 if (chl->client->router)
2363 /* Checks whether given channel has locally connected users. If it does this
2364 returns TRUE and FALSE if there is not one locally connected client. */
2366 int silc_server_channel_has_local(SilcChannelEntry channel)
2368 SilcChannelClientEntry chl;
2370 silc_list_start(channel->user_list);
2371 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2372 if (!chl->client->router)
2379 /* Removes client from all channels it has joined. This is used when client
2380 connection is disconnected. If the client on a channel is last, the
2381 channel is removed as well. This sends the SIGNOFF notify types. */
2383 void silc_server_remove_from_channels(SilcServer server,
2384 SilcSocketConnection sock,
2385 SilcClientEntry client,
2387 char *signoff_message,
2390 SilcChannelEntry channel;
2391 SilcChannelClientEntry chl;
2394 SILC_LOG_DEBUG(("Start"));
2396 if (!client || !client->id)
2399 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2401 /* Remove the client from all channels. The client is removed from
2402 the channels' user list. */
2403 silc_list_start(client->channels);
2404 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2405 channel = chl->channel;
2407 /* Remove channel from client's channel list */
2408 silc_list_del(client->channels, chl);
2410 /* Remove channel if there is no users anymore */
2411 if (server->server_type == SILC_ROUTER &&
2412 silc_list_count(channel->user_list) < 2) {
2413 server->stat.my_channels--;
2416 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2418 if (channel->founder_key) {
2419 /* The founder auth data exists, do not remove the channel entry */
2420 SilcChannelClientEntry chl2;
2424 silc_list_start(channel->user_list);
2425 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2426 silc_list_del(chl2->client->channels, chl2);
2427 silc_list_del(channel->user_list, chl2);
2433 if (!silc_idlist_del_channel(server->local_list, channel))
2434 silc_idlist_del_channel(server->global_list, channel);
2438 /* Remove client from channel's client list */
2439 silc_list_del(channel->user_list, chl);
2441 server->stat.my_chanclients--;
2443 /* If there is no global users on the channel anymore mark the channel
2444 as local channel. */
2445 if (server->server_type == SILC_SERVER &&
2446 !silc_server_channel_has_global(channel))
2447 channel->global_users = FALSE;
2449 /* If there is not at least one local user on the channel then we don't
2450 need the channel entry anymore, we can remove it safely. */
2451 if (server->server_type == SILC_SERVER &&
2452 !silc_server_channel_has_local(channel)) {
2453 /* Notify about leaving client if this channel has global users. */
2454 if (notify && channel->global_users)
2455 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2456 SILC_NOTIFY_TYPE_SIGNOFF,
2457 signoff_message ? 2 : 1,
2458 clidp->data, clidp->len,
2459 signoff_message, signoff_message ?
2460 strlen(signoff_message) : 0);
2462 server->stat.my_channels--;
2465 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2467 if (channel->founder_key) {
2468 /* The founder auth data exists, do not remove the channel entry */
2469 SilcChannelClientEntry chl2;
2473 silc_list_start(channel->user_list);
2474 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2475 silc_list_del(chl2->client->channels, chl2);
2476 silc_list_del(channel->user_list, chl2);
2482 if (!silc_idlist_del_channel(server->local_list, channel))
2483 silc_idlist_del_channel(server->global_list, channel);
2487 /* Send notify to channel about client leaving SILC and thus
2488 the entire channel. */
2490 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2491 SILC_NOTIFY_TYPE_SIGNOFF,
2492 signoff_message ? 2 : 1,
2493 clidp->data, clidp->len,
2494 signoff_message, signoff_message ?
2495 strlen(signoff_message) : 0);
2497 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2498 /* Re-generate channel key */
2499 silc_server_create_channel_key(server, channel, 0);
2501 /* Send the channel key to the channel. The key of course is not sent
2502 to the client who was removed from the channel. */
2503 silc_server_send_channel_key(server, client->connection, channel,
2504 server->server_type == SILC_ROUTER ?
2505 FALSE : !server->standalone);
2509 silc_buffer_free(clidp);
2512 /* Removes client from one channel. This is used for example when client
2513 calls LEAVE command to remove itself from the channel. Returns TRUE
2514 if channel still exists and FALSE if the channel is removed when
2515 last client leaves the channel. If `notify' is FALSE notify messages
2518 int silc_server_remove_from_one_channel(SilcServer server,
2519 SilcSocketConnection sock,
2520 SilcChannelEntry channel,
2521 SilcClientEntry client,
2524 SilcChannelEntry ch;
2525 SilcChannelClientEntry chl;
2528 SILC_LOG_DEBUG(("Start"));
2530 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2532 /* Remove the client from the channel. The client is removed from
2533 the channel's user list. */
2534 silc_list_start(client->channels);
2535 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2536 if (chl->channel != channel)
2541 /* Remove channel from client's channel list */
2542 silc_list_del(client->channels, chl);
2544 /* Remove channel if there is no users anymore */
2545 if (server->server_type == SILC_ROUTER &&
2546 silc_list_count(channel->user_list) < 2) {
2548 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2549 if (!silc_idlist_del_channel(server->local_list, channel))
2550 silc_idlist_del_channel(server->global_list, channel);
2551 silc_buffer_free(clidp);
2552 server->stat.my_channels--;
2556 /* Remove client from channel's client list */
2557 silc_list_del(channel->user_list, chl);
2559 server->stat.my_chanclients--;
2561 /* If there is no global users on the channel anymore mark the channel
2562 as local channel. */
2563 if (server->server_type == SILC_SERVER &&
2564 !silc_server_channel_has_global(channel))
2565 channel->global_users = FALSE;
2567 /* If there is not at least one local user on the channel then we don't
2568 need the channel entry anymore, we can remove it safely. */
2569 if (server->server_type == SILC_SERVER &&
2570 !silc_server_channel_has_local(channel)) {
2571 /* Notify about leaving client if this channel has global users. */
2572 if (notify && channel->global_users)
2573 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2574 SILC_NOTIFY_TYPE_LEAVE, 1,
2575 clidp->data, clidp->len);
2577 server->stat.my_channels--;
2578 silc_buffer_free(clidp);
2581 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2583 if (channel->founder_key) {
2584 /* The founder auth data exists, do not remove the channel entry */
2585 SilcChannelClientEntry chl2;
2589 silc_list_start(channel->user_list);
2590 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2591 silc_list_del(chl2->client->channels, chl2);
2592 silc_list_del(channel->user_list, chl2);
2598 if (!silc_idlist_del_channel(server->local_list, channel))
2599 silc_idlist_del_channel(server->global_list, channel);
2603 /* Send notify to channel about client leaving the channel */
2605 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2606 SILC_NOTIFY_TYPE_LEAVE, 1,
2607 clidp->data, clidp->len);
2611 silc_buffer_free(clidp);
2615 /* Returns TRUE if the given client is on the channel. FALSE if not.
2616 This works because we assure that the user list on the channel is
2617 always in up to date thus we can only check the channel list from
2618 `client' which is faster than checking the user list from `channel'. */
2620 int silc_server_client_on_channel(SilcClientEntry client,
2621 SilcChannelEntry channel)
2623 SilcChannelClientEntry chl;
2625 if (!client || !channel)
2628 silc_list_start(client->channels);
2629 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END)
2630 if (chl->channel == channel)
2636 /* Timeout callback. This is called if connection is idle or for some
2637 other reason is not responding within some period of time. This
2638 disconnects the remote end. */
2640 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2642 SilcServer server = (SilcServer)context;
2643 SilcSocketConnection sock = server->sockets[fd];
2648 if (sock->user_data)
2649 silc_server_free_sock_user_data(server, sock);
2651 silc_server_disconnect_remote(server, sock,
2652 "Server closed connection: "
2653 "Connection timeout");
2656 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2657 function may be used only by router. In real SILC network all channels
2658 are created by routers thus this function is never used by normal
2661 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2662 SilcServerID *router_id,
2668 SilcChannelID *channel_id;
2669 SilcChannelEntry entry;
2673 SILC_LOG_DEBUG(("Creating new channel"));
2676 cipher = "aes-256-cbc";
2678 hmac = "hmac-sha1-96";
2680 /* Allocate cipher */
2681 if (!silc_cipher_alloc(cipher, &key))
2685 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2686 silc_cipher_free(key);
2690 channel_name = strdup(channel_name);
2692 /* Create the channel */
2693 silc_id_create_channel_id(router_id, server->rng, &channel_id);
2694 entry = silc_idlist_add_channel(server->local_list, channel_name,
2695 SILC_CHANNEL_MODE_NONE, channel_id,
2696 NULL, key, newhmac);
2698 silc_free(channel_name);
2702 entry->cipher = strdup(cipher);
2703 entry->hmac_name = strdup(hmac);
2705 /* Now create the actual key material */
2706 silc_server_create_channel_key(server, entry,
2707 silc_cipher_get_key_len(key) / 8);
2709 /* Notify other routers about the new channel. We send the packet
2710 to our primary route. */
2711 if (broadcast && server->standalone == FALSE)
2712 silc_server_send_new_channel(server, server->router->connection, TRUE,
2713 channel_name, entry->id, SILC_ID_CHANNEL_LEN,
2716 server->stat.my_channels++;
2721 /* Same as above but creates the channel with Channel ID `channel_id. */
2724 silc_server_create_new_channel_with_id(SilcServer server,
2728 SilcChannelID *channel_id,
2731 SilcChannelEntry entry;
2735 SILC_LOG_DEBUG(("Creating new channel"));
2738 cipher = "aes-256-cbc";
2740 hmac = "hmac-sha1-96";
2742 /* Allocate cipher */
2743 if (!silc_cipher_alloc(cipher, &key))
2747 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2748 silc_cipher_free(key);
2752 channel_name = strdup(channel_name);
2754 /* Create the channel */
2755 entry = silc_idlist_add_channel(server->local_list, channel_name,
2756 SILC_CHANNEL_MODE_NONE, channel_id,
2757 NULL, key, newhmac);
2759 silc_free(channel_name);
2763 /* Now create the actual key material */
2764 silc_server_create_channel_key(server, entry,
2765 silc_cipher_get_key_len(key) / 8);
2767 /* Notify other routers about the new channel. We send the packet
2768 to our primary route. */
2769 if (broadcast && server->standalone == FALSE)
2770 silc_server_send_new_channel(server, server->router->connection, TRUE,
2771 channel_name, entry->id, SILC_ID_CHANNEL_LEN,
2774 server->stat.my_channels++;
2779 /* Channel's key re-key timeout callback. */
2781 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
2783 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
2784 SilcServer server = (SilcServer)rekey->context;
2786 silc_server_create_channel_key(server, rekey->channel, rekey->key_len);
2787 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
2789 silc_task_register(server->timeout_queue, 0,
2790 silc_server_channel_key_rekey,
2791 (void *)rekey, 3600, 0,
2793 SILC_TASK_PRI_NORMAL);
2796 /* Generates new channel key. This is used to create the initial channel key
2797 but also to re-generate new key for channel. If `key_len' is provided
2798 it is the bytes of the key length. */
2800 void silc_server_create_channel_key(SilcServer server,
2801 SilcChannelEntry channel,
2805 unsigned char channel_key[32], hash[32];
2808 SILC_LOG_DEBUG(("Generating channel key"));
2810 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
2811 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
2815 if (!channel->channel_key)
2816 if (!silc_cipher_alloc("aes-256-cbc", &channel->channel_key))
2821 else if (channel->key_len)
2822 len = channel->key_len / 8;
2824 len = silc_cipher_get_key_len(channel->channel_key) / 8;
2826 /* Create channel key */
2827 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
2830 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
2832 /* Remove old key if exists */
2834 memset(channel->key, 0, channel->key_len / 8);
2835 silc_free(channel->key);
2839 channel->key_len = len * 8;
2840 channel->key = silc_calloc(len, sizeof(*channel->key));
2841 memcpy(channel->key, channel_key, len);
2842 memset(channel_key, 0, sizeof(channel_key));
2844 /* Generate HMAC key from the channel key data and set it */
2846 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2847 silc_hash_make(channel->hmac->hash, channel->key, len, hash);
2848 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2849 memset(hash, 0, sizeof(hash));
2851 if (server->server_type == SILC_ROUTER) {
2852 if (!channel->rekey)
2853 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
2854 channel->rekey->context = (void *)server;
2855 channel->rekey->channel = channel;
2856 channel->rekey->key_len = key_len;
2858 silc_task_unregister_by_callback(server->timeout_queue,
2859 silc_server_channel_key_rekey);
2860 silc_task_register(server->timeout_queue, 0,
2861 silc_server_channel_key_rekey,
2862 (void *)channel->rekey, 3600, 0,
2864 SILC_TASK_PRI_NORMAL);
2868 /* Saves the channel key found in the encoded `key_payload' buffer. This
2869 function is used when we receive Channel Key Payload and also when we're
2870 processing JOIN command reply. Returns entry to the channel. */
2872 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
2873 SilcBuffer key_payload,
2874 SilcChannelEntry channel)
2876 SilcChannelKeyPayload payload = NULL;
2877 SilcChannelID *id = NULL;
2878 unsigned char *tmp, hash[32];
2882 SILC_LOG_DEBUG(("Start"));
2884 /* Decode channel key payload */
2885 payload = silc_channel_key_payload_parse(key_payload);
2887 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
2892 /* Get the channel entry */
2895 /* Get channel ID */
2896 tmp = silc_channel_key_get_id(payload, &tmp_len);
2897 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
2903 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
2905 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
2907 SILC_LOG_ERROR(("Received key for non-existent channel"));
2913 tmp = silc_channel_key_get_key(payload, &tmp_len);
2919 cipher = silc_channel_key_get_cipher(payload, NULL);
2925 /* Remove old key if exists */
2927 memset(channel->key, 0, channel->key_len / 8);
2928 silc_free(channel->key);
2929 silc_cipher_free(channel->channel_key);
2932 /* Create new cipher */
2933 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
2938 if (channel->cipher)
2939 silc_free(channel->cipher);
2940 channel->cipher = strdup(cipher);
2943 channel->key_len = tmp_len * 8;
2944 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
2945 memcpy(channel->key, tmp, tmp_len);
2946 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
2948 /* Generate HMAC key from the channel key data and set it */
2950 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2951 silc_hash_make(channel->hmac->hash, tmp, tmp_len, hash);
2952 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2954 memset(hash, 0, sizeof(hash));
2955 memset(tmp, 0, tmp_len);
2957 if (server->server_type == SILC_ROUTER) {
2958 if (!channel->rekey)
2959 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
2960 channel->rekey->context = (void *)server;
2961 channel->rekey->channel = channel;
2963 silc_task_unregister_by_callback(server->timeout_queue,
2964 silc_server_channel_key_rekey);
2965 silc_task_register(server->timeout_queue, 0,
2966 silc_server_channel_key_rekey,
2967 (void *)channel->rekey, 3600, 0,
2969 SILC_TASK_PRI_NORMAL);
2976 silc_channel_key_payload_free(payload);
2981 /* Heartbeat callback. This function is set as argument for the
2982 silc_socket_set_heartbeat function. The library will call this function
2983 at the set time interval. */
2985 void silc_server_perform_heartbeat(SilcSocketConnection sock,
2988 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
2990 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname,
2993 /* Send the heartbeat */
2994 silc_server_send_heartbeat(hb->server, sock);
2997 /* Returns assembled of all servers in the given ID list. The packet's
2998 form is dictated by the New ID payload. */
3000 static void silc_server_announce_get_servers(SilcServer server,
3002 SilcBuffer *servers)
3004 SilcIDCacheList list;
3005 SilcIDCacheEntry id_cache;
3006 SilcServerEntry entry;
3009 /* Go through all clients in the list */
3010 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
3011 SILC_ID_SERVER, &list)) {
3012 if (silc_idcache_list_first(list, &id_cache)) {
3014 entry = (SilcServerEntry)id_cache->context;
3016 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3018 *servers = silc_buffer_realloc(*servers,
3020 (*servers)->truelen + idp->len :
3022 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3023 silc_buffer_put(*servers, idp->data, idp->len);
3024 silc_buffer_pull(*servers, idp->len);
3025 silc_buffer_free(idp);
3027 if (!silc_idcache_list_next(list, &id_cache))
3032 silc_idcache_list_free(list);
3036 /* This function is used by router to announce existing servers to our
3037 primary router when we've connected to it. */
3039 void silc_server_announce_servers(SilcServer server)
3041 SilcBuffer servers = NULL;
3043 SILC_LOG_DEBUG(("Announcing servers"));
3045 /* Get servers in local list */
3046 silc_server_announce_get_servers(server, server->local_list, &servers);
3048 /* Get servers in global list */
3049 silc_server_announce_get_servers(server, server->global_list, &servers);
3052 silc_buffer_push(servers, servers->data - servers->head);
3053 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3055 /* Send the packet */
3056 silc_server_packet_send(server, server->router->connection,
3057 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3058 servers->data, servers->len, TRUE);
3060 silc_buffer_free(servers);
3064 /* Returns assembled packet of all clients in the given ID list. The
3065 packet's form is dictated by the New ID Payload. */
3067 static void silc_server_announce_get_clients(SilcServer server,
3069 SilcBuffer *clients)
3071 SilcIDCacheList list;
3072 SilcIDCacheEntry id_cache;
3073 SilcClientEntry client;
3076 /* Go through all clients in the list */
3077 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
3078 SILC_ID_CLIENT, &list)) {
3079 if (silc_idcache_list_first(list, &id_cache)) {
3081 client = (SilcClientEntry)id_cache->context;
3083 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3085 *clients = silc_buffer_realloc(*clients,
3087 (*clients)->truelen + idp->len :
3089 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3090 silc_buffer_put(*clients, idp->data, idp->len);
3091 silc_buffer_pull(*clients, idp->len);
3092 silc_buffer_free(idp);
3094 if (!silc_idcache_list_next(list, &id_cache))
3099 silc_idcache_list_free(list);
3103 /* This function is used to announce our existing clients to our router
3104 when we've connected to it. */
3106 void silc_server_announce_clients(SilcServer server)
3108 SilcBuffer clients = NULL;
3110 SILC_LOG_DEBUG(("Announcing clients"));
3112 /* Get clients in local list */
3113 silc_server_announce_get_clients(server, server->local_list,
3116 /* As router we announce our global list as well */
3117 if (server->server_type == SILC_ROUTER)
3118 silc_server_announce_get_clients(server, server->global_list,
3122 silc_buffer_push(clients, clients->data - clients->head);
3123 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3125 /* Send the packet */
3126 silc_server_packet_send(server, server->router->connection,
3127 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3128 clients->data, clients->len, TRUE);
3130 silc_buffer_free(clients);
3135 silc_server_announce_encode_join(uint32 argc, ...)
3140 return silc_notify_payload_encode(SILC_NOTIFY_TYPE_JOIN, argc, ap);
3143 /* Returns assembled packets for channel users of the `channel'. */
3145 void silc_server_announce_get_channel_users(SilcServer server,
3146 SilcChannelEntry channel,
3147 SilcBuffer *channel_users)
3149 SilcChannelClientEntry chl;
3150 SilcBuffer chidp, clidp;
3154 SILC_LOG_DEBUG(("Start"));
3156 /* Now find all users on the channel */
3157 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3158 silc_list_start(channel->user_list);
3159 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
3160 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3161 tmp = silc_server_announce_encode_join(2, clidp->data, clidp->len,
3162 chidp->data, chidp->len);
3165 silc_buffer_realloc(*channel_users,
3167 (*channel_users)->truelen + len : len));
3168 silc_buffer_pull_tail(*channel_users,
3169 ((*channel_users)->end -
3170 (*channel_users)->data));
3172 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3173 silc_buffer_pull(*channel_users, len);
3174 silc_buffer_free(clidp);
3175 silc_buffer_free(tmp);
3177 silc_buffer_free(chidp);
3180 /* Returns assembled packets for all channels and users on those channels
3181 from the given ID List. The packets are in the form dictated by the
3182 New Channel and New Channel User payloads. */
3184 void silc_server_announce_get_channels(SilcServer server,
3186 SilcBuffer *channels,
3187 SilcBuffer *channel_users)
3189 SilcIDCacheList list;
3190 SilcIDCacheEntry id_cache;
3191 SilcChannelEntry channel;
3196 SILC_LOG_DEBUG(("Start"));
3198 /* Go through all channels in the list */
3199 if (silc_idcache_find_by_id(id_list->channels, SILC_ID_CACHE_ANY,
3200 SILC_ID_CHANNEL, &list)) {
3201 if (silc_idcache_list_first(list, &id_cache)) {
3203 channel = (SilcChannelEntry)id_cache->context;
3205 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3206 name_len = strlen(channel->channel_name);
3208 len = 4 + name_len + SILC_ID_CHANNEL_LEN + 4;
3210 silc_buffer_realloc(*channels,
3211 (*channels ? (*channels)->truelen + len : len));
3212 silc_buffer_pull_tail(*channels,
3213 ((*channels)->end - (*channels)->data));
3214 silc_buffer_format(*channels,
3215 SILC_STR_UI_SHORT(name_len),
3216 SILC_STR_UI_XNSTRING(channel->channel_name,
3218 SILC_STR_UI_SHORT(SILC_ID_CHANNEL_LEN),
3219 SILC_STR_UI_XNSTRING(cid, SILC_ID_CHANNEL_LEN),
3220 SILC_STR_UI_INT(channel->mode),
3222 silc_buffer_pull(*channels, len);
3224 silc_server_announce_get_channel_users(server, channel,
3229 if (!silc_idcache_list_next(list, &id_cache))
3234 silc_idcache_list_free(list);
3238 /* This function is used to announce our existing channels to our router
3239 when we've connected to it. This also announces the users on the
3240 channels to the router. */
3242 void silc_server_announce_channels(SilcServer server)
3244 SilcBuffer channels = NULL, channel_users = NULL;
3246 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3248 /* Get channels and channel users in local list */
3249 silc_server_announce_get_channels(server, server->local_list,
3250 &channels, &channel_users);
3252 /* Get channels and channel users in global list */
3253 silc_server_announce_get_channels(server, server->global_list,
3254 &channels, &channel_users);
3257 silc_buffer_push(channels, channels->data - channels->head);
3258 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3260 /* Send the packet */
3261 silc_server_packet_send(server, server->router->connection,
3262 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3263 channels->data, channels->len,
3266 silc_buffer_free(channels);
3269 if (channel_users) {
3270 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3271 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3272 channel_users->len);
3274 /* Send the packet */
3275 silc_server_packet_send(server, server->router->connection,
3276 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3277 channel_users->data, channel_users->len,
3280 silc_buffer_free(channel_users);
3284 /* Failure timeout callback. If this is called then we will immediately
3285 process the received failure. We always process the failure with timeout
3286 since we do not want to blindly trust to received failure packets.
3287 This won't be called (the timeout is cancelled) if the failure was
3288 bogus (it is bogus if remote does not close the connection after sending
3291 SILC_TASK_CALLBACK(silc_server_failure_callback)
3293 SilcServerFailureContext f = (SilcServerFailureContext)context;
3295 if (f->sock->protocol) {
3296 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3297 f->sock->protocol->execute(f->server->timeout_queue, 0,
3298 f->sock->protocol, f->sock->sock, 0, 0);
3304 /* Assembles user list and users mode list from the `channel'. */
3306 void silc_server_get_users_on_channel(SilcServer server,
3307 SilcChannelEntry channel,
3308 SilcBuffer *user_list,
3309 SilcBuffer *mode_list,
3312 SilcChannelClientEntry chl;
3313 SilcBuffer client_id_list;
3314 SilcBuffer client_mode_list;
3316 uint32 list_count = 0;
3318 client_id_list = silc_buffer_alloc((SILC_ID_CLIENT_LEN + 4) *
3319 silc_list_count(channel->user_list));
3320 client_mode_list = silc_buffer_alloc(4 *
3321 silc_list_count(channel->user_list));
3322 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3323 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3324 silc_list_start(channel->user_list);
3325 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
3327 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3328 silc_buffer_put(client_id_list, idp->data, idp->len);
3329 silc_buffer_pull(client_id_list, idp->len);
3330 silc_buffer_free(idp);
3332 /* Client's mode on channel */
3333 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3334 silc_buffer_pull(client_mode_list, 4);
3338 silc_buffer_push(client_id_list,
3339 client_id_list->data - client_id_list->head);
3340 silc_buffer_push(client_mode_list,
3341 client_mode_list->data - client_mode_list->head);
3343 *user_list = client_id_list;
3344 *mode_list = client_mode_list;
3345 *user_count = list_count;
3348 /* Saves users and their modes to the `channel'. */
3350 void silc_server_save_users_on_channel(SilcServer server,
3351 SilcSocketConnection sock,
3352 SilcChannelEntry channel,
3353 SilcClientID *noadd,
3354 SilcBuffer user_list,
3355 SilcBuffer mode_list,
3360 /* Cache the received Client ID's and modes. This cache expires
3361 whenever server sends notify message to channel. It means two things;
3362 some user has joined or leaved the channel. XXX TODO! */
3363 for (i = 0; i < user_count; i++) {
3366 SilcClientID *client_id;
3367 SilcClientEntry client;
3370 SILC_GET16_MSB(idp_len, user_list->data + 2);
3372 client_id = silc_id_payload_parse_id(user_list->data, idp_len);
3373 silc_buffer_pull(user_list, idp_len);
3378 SILC_GET32_MSB(mode, mode_list->data);
3379 silc_buffer_pull(mode_list, 4);
3381 if (noadd && !SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3382 silc_free(client_id);
3386 /* Check if we have this client cached already. */
3387 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3390 client = silc_idlist_find_client_by_id(server->global_list,
3393 /* If router did not find such Client ID in its lists then this must
3394 be bogus client or some router in the net is buggy. */
3395 if (server->server_type == SILC_ROUTER) {
3396 silc_free(client_id);
3400 /* We don't have that client anywhere, add it. The client is added
3401 to global list since server didn't have it in the lists so it must be
3403 client = silc_idlist_add_client(server->global_list, NULL, 0, NULL,
3405 silc_id_dup(client_id, SILC_ID_CLIENT),
3406 sock->user_data, NULL);
3408 silc_free(client_id);
3412 client->data.registered = TRUE;
3415 silc_free(client_id);
3417 if (!silc_server_client_on_channel(client, channel)) {
3418 /* Client was not on the channel, add it. */
3419 SilcChannelClientEntry chl = silc_calloc(1, sizeof(*chl));
3420 chl->client = client;
3422 chl->channel = channel;
3423 silc_list_add(channel->user_list, chl);
3424 silc_list_add(client->channels, chl);
3429 /* Lookups route to the client indicated by the `id_data'. The connection
3430 object and internal data object is returned. Returns NULL if route
3431 could not be found to the client. If the `client_id' is specified then
3432 it is used and the `id_data' is ignored. */
3434 SilcSocketConnection silc_server_get_client_route(SilcServer server,
3435 unsigned char *id_data,
3437 SilcClientID *client_id,
3438 SilcIDListData *idata)
3441 SilcClientEntry client;
3443 SILC_LOG_DEBUG(("Start"));
3445 /* Decode destination Client ID */
3447 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
3449 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
3453 id = silc_id_dup(client_id, SILC_ID_CLIENT);
3456 /* If the destination belongs to our server we don't have to route
3457 the packet anywhere but to send it to the local destination. */
3458 client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
3462 if (client && client->data.registered == FALSE)
3465 /* If we are router and the client has router then the client is in
3466 our cell but not directly connected to us. */
3467 if (server->server_type == SILC_ROUTER && client->router) {
3468 /* We are of course in this case the client's router thus the real
3469 "router" of the client is the server who owns the client. Thus
3470 we will send the packet to that server. */
3472 *idata = (SilcIDListData)client->router;
3473 return client->router->connection;
3476 /* Seems that client really is directly connected to us */
3478 *idata = (SilcIDListData)client;
3479 return client->connection;
3482 /* Destination belongs to someone not in this server. If we are normal
3483 server our action is to send the packet to our router. */
3484 if (server->server_type == SILC_SERVER && !server->standalone) {
3487 *idata = (SilcIDListData)server->router;
3488 return server->router->connection;
3491 /* We are router and we will perform route lookup for the destination
3492 and send the packet to fastest route. */
3493 if (server->server_type == SILC_ROUTER && !server->standalone) {
3494 /* Check first that the ID is valid */
3495 client = silc_idlist_find_client_by_id(server->global_list, id, NULL);
3497 SilcSocketConnection dst_sock;
3499 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
3503 *idata = (SilcIDListData)dst_sock->user_data;
3512 /* Encodes and returns channel list of channels the `client' has joined.
3513 Secret channels are not put to the list. */
3515 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
3516 SilcClientEntry client)
3518 SilcBuffer buffer = NULL;
3519 SilcChannelEntry channel;
3520 SilcChannelClientEntry chl;
3525 silc_list_start(client->channels);
3526 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
3527 channel = chl->channel;
3529 if (channel->mode & SILC_CHANNEL_MODE_SECRET)
3532 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3533 name_len = strlen(channel->channel_name);
3535 len = 4 + name_len + SILC_ID_CHANNEL_LEN + 4;
3536 buffer = silc_buffer_realloc(buffer,
3537 (buffer ? (buffer)->truelen + len : len));
3538 silc_buffer_pull_tail(buffer, ((buffer)->end - (buffer)->data));
3539 silc_buffer_format(buffer,
3540 SILC_STR_UI_SHORT(name_len),
3541 SILC_STR_UI_XNSTRING(channel->channel_name,
3543 SILC_STR_UI_SHORT(SILC_ID_CHANNEL_LEN),
3544 SILC_STR_UI_XNSTRING(cid, SILC_ID_CHANNEL_LEN),
3545 SILC_STR_UI_INT(chl->mode), /* Client's mode */
3547 silc_buffer_pull(buffer, len);
3552 silc_buffer_push(buffer, buffer->data - buffer->head);
3557 /* Finds client entry by Client ID and if it is not found then resolves
3558 it using WHOIS command. */
3560 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
3561 SilcClientID *client_id)
3563 SilcClientEntry client;
3565 client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL);
3567 client = silc_idlist_find_client_by_id(server->global_list,
3569 if (!client && server->server_type == SILC_ROUTER)
3573 if (!client && server->standalone)
3576 if (!client || !client->nickname || !client->username) {
3577 SilcBuffer buffer, idp;
3579 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
3580 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
3581 ++server->cmd_ident, 1,
3582 3, idp->data, idp->len);
3583 silc_server_packet_send(server, client ? client->router->connection :
3584 server->router->connection,
3585 SILC_PACKET_COMMAND, 0,
3586 buffer->data, buffer->len, FALSE);
3587 silc_buffer_free(idp);
3588 silc_buffer_free(buffer);
3594 /* A timeout callback for the re-key. We will be the initiator of the
3597 SILC_TASK_CALLBACK(silc_server_rekey_callback)
3599 SilcSocketConnection sock = (SilcSocketConnection)context;
3600 SilcIDListData idata = (SilcIDListData)sock->user_data;
3601 SilcServer server = (SilcServer)idata->rekey->context;
3602 SilcProtocol protocol;
3603 SilcServerRekeyInternalContext *proto_ctx;
3605 SILC_LOG_DEBUG(("Start"));
3607 /* Allocate internal protocol context. This is sent as context
3609 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
3610 proto_ctx->server = (void *)server;
3611 proto_ctx->sock = sock;
3612 proto_ctx->responder = FALSE;
3613 proto_ctx->pfs = idata->rekey->pfs;
3615 /* Perform rekey protocol. Will call the final callback after the
3616 protocol is over. */
3617 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
3618 &protocol, proto_ctx, silc_server_rekey_final);
3619 sock->protocol = protocol;
3621 /* Run the protocol */
3622 protocol->execute(server->timeout_queue, 0, protocol,
3625 /* Re-register re-key timeout */
3626 silc_task_register(server->timeout_queue, sock->sock,
3627 silc_server_rekey_callback,
3628 context, idata->rekey->timeout, 0,
3629 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
3632 /* The final callback for the REKEY protocol. This will actually take the
3633 new key material into use. */
3635 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
3637 SilcProtocol protocol = (SilcProtocol)context;
3638 SilcServerRekeyInternalContext *ctx =
3639 (SilcServerRekeyInternalContext *)protocol->context;
3640 SilcServer server = (SilcServer)ctx->server;
3641 SilcSocketConnection sock = ctx->sock;
3643 SILC_LOG_DEBUG(("Start"));
3645 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
3646 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
3647 /* Error occured during protocol */
3648 silc_protocol_cancel(server->timeout_queue, protocol);
3649 silc_protocol_free(protocol);
3650 sock->protocol = NULL;
3652 silc_packet_context_free(ctx->packet);
3654 silc_ske_free(ctx->ske);
3659 /* Take the keys into use */
3660 if (ctx->pfs == TRUE)
3661 silc_server_protocol_rekey_generate_pfs(server, ctx);
3663 silc_server_protocol_rekey_generate(server, ctx);
3666 silc_protocol_free(protocol);
3667 sock->protocol = NULL;
3669 silc_packet_context_free(ctx->packet);
3671 silc_ske_free(ctx->ske);