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_UNKNOWN:
1508 /* Parse the packet with timeout */
1509 silc_task_register(server->timeout_queue, sock->sock,
1510 silc_server_packet_parse_real,
1511 (void *)parser_context, 0, 100000,
1513 SILC_TASK_PRI_NORMAL);
1515 case SILC_SOCKET_TYPE_CLIENT:
1516 /* Parse the packet with timeout (unless protocol is active) */
1517 silc_task_register(server->timeout_queue, sock->sock,
1518 silc_server_packet_parse_real,
1519 (void *)parser_context, 0,
1520 (sock->protocol ? 1 : 100000),
1522 SILC_TASK_PRI_NORMAL);
1524 case SILC_SOCKET_TYPE_SERVER:
1525 case SILC_SOCKET_TYPE_ROUTER:
1526 /* Packets from servers are parsed as soon as possible */
1527 silc_task_register(server->timeout_queue, sock->sock,
1528 silc_server_packet_parse_real,
1529 (void *)parser_context, 0, 1,
1531 SILC_TASK_PRI_NORMAL);
1538 /* Parses the packet type and calls what ever routines the packet type
1539 requires. This is done for all incoming packets. */
1541 void silc_server_packet_parse_type(SilcServer server,
1542 SilcSocketConnection sock,
1543 SilcPacketContext *packet)
1545 SilcPacketType type = packet->type;
1547 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1549 /* Parse the packet type */
1551 case SILC_PACKET_DISCONNECT:
1552 SILC_LOG_DEBUG(("Disconnect packet"));
1553 if (packet->flags & SILC_PACKET_FLAG_LIST)
1557 case SILC_PACKET_SUCCESS:
1559 * Success received for something. For now we can have only
1560 * one protocol for connection executing at once hence this
1561 * success message is for whatever protocol is executing currently.
1563 SILC_LOG_DEBUG(("Success packet"));
1564 if (packet->flags & SILC_PACKET_FLAG_LIST)
1566 if (sock->protocol) {
1567 sock->protocol->execute(server->timeout_queue, 0,
1568 sock->protocol, sock->sock, 0, 0);
1572 case SILC_PACKET_FAILURE:
1574 * Failure received for something. For now we can have only
1575 * one protocol for connection executing at once hence this
1576 * failure message is for whatever protocol is executing currently.
1578 SILC_LOG_DEBUG(("Failure packet"));
1579 if (packet->flags & SILC_PACKET_FLAG_LIST)
1581 if (sock->protocol) {
1582 SilcServerFailureContext f;
1583 f = silc_calloc(1, sizeof(*f));
1587 /* We will wait 5 seconds to process this failure packet */
1588 silc_task_register(server->timeout_queue, sock->sock,
1589 silc_server_failure_callback, (void *)f, 5, 0,
1590 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1594 case SILC_PACKET_REJECT:
1595 SILC_LOG_DEBUG(("Reject packet"));
1596 if (packet->flags & SILC_PACKET_FLAG_LIST)
1601 case SILC_PACKET_NOTIFY:
1603 * Received notify packet. Server can receive notify packets from
1604 * router. Server then relays the notify messages to clients if needed.
1606 SILC_LOG_DEBUG(("Notify packet"));
1607 if (packet->flags & SILC_PACKET_FLAG_LIST)
1608 silc_server_notify_list(server, sock, packet);
1610 silc_server_notify(server, sock, packet);
1616 case SILC_PACKET_CHANNEL_MESSAGE:
1618 * Received channel message. Channel messages are special packets
1619 * (although probably most common ones) thus they are handled
1622 SILC_LOG_DEBUG(("Channel Message packet"));
1623 if (packet->flags & SILC_PACKET_FLAG_LIST)
1625 silc_server_channel_message(server, sock, packet);
1628 case SILC_PACKET_CHANNEL_KEY:
1630 * Received key for channel. As channels are created by the router
1631 * the keys are as well. We will distribute the key to all of our
1632 * locally connected clients on the particular channel. Router
1633 * never receives this channel and thus is ignored.
1635 SILC_LOG_DEBUG(("Channel Key packet"));
1636 if (packet->flags & SILC_PACKET_FLAG_LIST)
1638 silc_server_channel_key(server, sock, packet);
1644 case SILC_PACKET_COMMAND:
1646 * Recived command. Processes the command request and allocates the
1647 * command context and calls the command.
1649 SILC_LOG_DEBUG(("Command packet"));
1650 if (packet->flags & SILC_PACKET_FLAG_LIST)
1652 silc_server_command_process(server, sock, packet);
1655 case SILC_PACKET_COMMAND_REPLY:
1657 * Received command reply packet. Received command reply to command. It
1658 * may be reply to command sent by us or reply to command sent by client
1659 * that we've routed further.
1661 SILC_LOG_DEBUG(("Command Reply packet"));
1662 if (packet->flags & SILC_PACKET_FLAG_LIST)
1664 silc_server_command_reply(server, sock, packet);
1668 * Private Message packets
1670 case SILC_PACKET_PRIVATE_MESSAGE:
1672 * Received private message packet. The packet is coming from either
1675 SILC_LOG_DEBUG(("Private Message packet"));
1676 if (packet->flags & SILC_PACKET_FLAG_LIST)
1678 silc_server_private_message(server, sock, packet);
1681 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1683 * Private message key packet.
1685 if (packet->flags & SILC_PACKET_FLAG_LIST)
1687 silc_server_private_message_key(server, sock, packet);
1691 * Key Exchange protocol packets
1693 case SILC_PACKET_KEY_EXCHANGE:
1694 SILC_LOG_DEBUG(("KE packet"));
1695 if (packet->flags & SILC_PACKET_FLAG_LIST)
1698 if (sock->protocol && sock->protocol->protocol &&
1699 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1701 SilcServerKEInternalContext *proto_ctx =
1702 (SilcServerKEInternalContext *)sock->protocol->context;
1704 proto_ctx->packet = silc_packet_context_dup(packet);
1706 /* Let the protocol handle the packet */
1707 sock->protocol->execute(server->timeout_queue, 0,
1708 sock->protocol, sock->sock, 0, 100000);
1710 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1711 "protocol active, packet dropped."));
1713 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1717 case SILC_PACKET_KEY_EXCHANGE_1:
1718 SILC_LOG_DEBUG(("KE 1 packet"));
1719 if (packet->flags & SILC_PACKET_FLAG_LIST)
1722 if (sock->protocol && sock->protocol->protocol &&
1723 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1724 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1726 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1727 SilcServerRekeyInternalContext *proto_ctx =
1728 (SilcServerRekeyInternalContext *)sock->protocol->context;
1730 if (proto_ctx->packet)
1731 silc_packet_context_free(proto_ctx->packet);
1733 proto_ctx->packet = silc_packet_context_dup(packet);
1735 /* Let the protocol handle the packet */
1736 sock->protocol->execute(server->timeout_queue, 0,
1737 sock->protocol, sock->sock, 0, 0);
1739 SilcServerKEInternalContext *proto_ctx =
1740 (SilcServerKEInternalContext *)sock->protocol->context;
1742 if (proto_ctx->packet)
1743 silc_packet_context_free(proto_ctx->packet);
1745 proto_ctx->packet = silc_packet_context_dup(packet);
1746 proto_ctx->dest_id_type = packet->src_id_type;
1747 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1748 packet->src_id_type);
1749 if (!proto_ctx->dest_id)
1752 /* Let the protocol handle the packet */
1753 sock->protocol->execute(server->timeout_queue, 0,
1754 sock->protocol, sock->sock,
1758 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1759 "protocol active, packet dropped."));
1763 case SILC_PACKET_KEY_EXCHANGE_2:
1764 SILC_LOG_DEBUG(("KE 2 packet"));
1765 if (packet->flags & SILC_PACKET_FLAG_LIST)
1768 if (sock->protocol && sock->protocol->protocol &&
1769 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1770 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
1772 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1773 SilcServerRekeyInternalContext *proto_ctx =
1774 (SilcServerRekeyInternalContext *)sock->protocol->context;
1776 if (proto_ctx->packet)
1777 silc_packet_context_free(proto_ctx->packet);
1779 proto_ctx->packet = silc_packet_context_dup(packet);
1781 /* Let the protocol handle the packet */
1782 sock->protocol->execute(server->timeout_queue, 0,
1783 sock->protocol, sock->sock, 0, 0);
1785 SilcServerKEInternalContext *proto_ctx =
1786 (SilcServerKEInternalContext *)sock->protocol->context;
1788 if (proto_ctx->packet)
1789 silc_packet_context_free(proto_ctx->packet);
1791 proto_ctx->packet = silc_packet_context_dup(packet);
1792 proto_ctx->dest_id_type = packet->src_id_type;
1793 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1794 packet->src_id_type);
1795 if (!proto_ctx->dest_id)
1798 /* Let the protocol handle the packet */
1799 sock->protocol->execute(server->timeout_queue, 0,
1800 sock->protocol, sock->sock,
1804 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
1805 "protocol active, packet dropped."));
1809 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
1811 * Connection authentication request packet. When we receive this packet
1812 * we will send to the other end information about our mandatory
1813 * authentication method for the connection. This packet maybe received
1816 SILC_LOG_DEBUG(("Connection authentication request packet"));
1817 if (packet->flags & SILC_PACKET_FLAG_LIST)
1819 silc_server_connection_auth_request(server, sock, packet);
1823 * Connection Authentication protocol packets
1825 case SILC_PACKET_CONNECTION_AUTH:
1826 /* Start of the authentication protocol. We receive here the
1827 authentication data and will verify it. */
1828 SILC_LOG_DEBUG(("Connection auth packet"));
1829 if (packet->flags & SILC_PACKET_FLAG_LIST)
1832 if (sock->protocol && sock->protocol->protocol->type
1833 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
1835 SilcServerConnAuthInternalContext *proto_ctx =
1836 (SilcServerConnAuthInternalContext *)sock->protocol->context;
1838 proto_ctx->packet = silc_packet_context_dup(packet);
1840 /* Let the protocol handle the packet */
1841 sock->protocol->execute(server->timeout_queue, 0,
1842 sock->protocol, sock->sock, 0, 0);
1844 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1845 "protocol active, packet dropped."));
1849 case SILC_PACKET_NEW_ID:
1851 * Received New ID packet. This includes some new ID that has been
1852 * created. It may be for client, server or channel. This is the way
1853 * to distribute information about new registered entities in the
1856 SILC_LOG_DEBUG(("New ID packet"));
1857 if (packet->flags & SILC_PACKET_FLAG_LIST)
1858 silc_server_new_id_list(server, sock, packet);
1860 silc_server_new_id(server, sock, packet);
1863 case SILC_PACKET_NEW_CLIENT:
1865 * Received new client packet. This includes client information that
1866 * we will use to create initial client ID. After creating new
1867 * ID we will send it to the client.
1869 SILC_LOG_DEBUG(("New Client packet"));
1870 if (packet->flags & SILC_PACKET_FLAG_LIST)
1872 silc_server_new_client(server, sock, packet);
1875 case SILC_PACKET_NEW_SERVER:
1877 * Received new server packet. This includes Server ID and some other
1878 * information that we may save. This is received after server has
1881 SILC_LOG_DEBUG(("New Server packet"));
1882 if (packet->flags & SILC_PACKET_FLAG_LIST)
1884 silc_server_new_server(server, sock, packet);
1887 case SILC_PACKET_NEW_CHANNEL:
1889 * Received new channel packet. Information about new channel in the
1890 * network are distributed using this packet.
1892 SILC_LOG_DEBUG(("New Channel packet"));
1893 if (packet->flags & SILC_PACKET_FLAG_LIST)
1894 silc_server_new_channel_list(server, sock, packet);
1896 silc_server_new_channel(server, sock, packet);
1899 case SILC_PACKET_HEARTBEAT:
1901 * Received heartbeat.
1903 SILC_LOG_DEBUG(("Heartbeat packet"));
1904 if (packet->flags & SILC_PACKET_FLAG_LIST)
1908 case SILC_PACKET_KEY_AGREEMENT:
1910 * Received heartbeat.
1912 SILC_LOG_DEBUG(("Key agreement packet"));
1913 if (packet->flags & SILC_PACKET_FLAG_LIST)
1915 silc_server_key_agreement(server, sock, packet);
1918 case SILC_PACKET_REKEY:
1920 * Received re-key packet. The sender wants to regenerate the session
1923 SILC_LOG_DEBUG(("Re-key packet"));
1924 if (packet->flags & SILC_PACKET_FLAG_LIST)
1926 silc_server_rekey(server, sock, packet);
1929 case SILC_PACKET_REKEY_DONE:
1931 * The re-key is done.
1933 SILC_LOG_DEBUG(("Re-key done packet"));
1934 if (packet->flags & SILC_PACKET_FLAG_LIST)
1937 if (sock->protocol && sock->protocol->protocol &&
1938 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
1940 SilcServerRekeyInternalContext *proto_ctx =
1941 (SilcServerRekeyInternalContext *)sock->protocol->context;
1943 if (proto_ctx->packet)
1944 silc_packet_context_free(proto_ctx->packet);
1946 proto_ctx->packet = silc_packet_context_dup(packet);
1948 /* Let the protocol handle the packet */
1949 sock->protocol->execute(server->timeout_queue, 0,
1950 sock->protocol, sock->sock,
1953 SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
1954 "protocol active, packet dropped."));
1959 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
1965 /* Creates connection to a remote router. */
1967 void silc_server_create_connection(SilcServer server,
1968 char *remote_host, uint32 port)
1970 SilcServerConnection sconn;
1972 /* Allocate connection object for hold connection specific stuff. */
1973 sconn = silc_calloc(1, sizeof(*sconn));
1974 sconn->server = server;
1975 sconn->remote_host = strdup(remote_host);
1976 sconn->remote_port = port;
1978 silc_task_register(server->timeout_queue, 0,
1979 silc_server_connect_router,
1980 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
1981 SILC_TASK_PRI_NORMAL);
1984 SILC_TASK_CALLBACK(silc_server_close_connection_final)
1986 silc_socket_free((SilcSocketConnection)context);
1989 /* Closes connection to socket connection */
1991 void silc_server_close_connection(SilcServer server,
1992 SilcSocketConnection sock)
1994 SILC_LOG_DEBUG(("Closing connection %d", sock->sock));
1996 /* We won't listen for this connection anymore */
1997 silc_schedule_unset_listen_fd(sock->sock);
1999 /* Unregister all tasks */
2000 silc_task_unregister_by_fd(server->io_queue, sock->sock);
2001 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
2003 /* Close the actual connection */
2004 silc_net_close_connection(sock->sock);
2005 server->sockets[sock->sock] = NULL;
2007 silc_task_register(server->timeout_queue, 0,
2008 silc_server_close_connection_final,
2009 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2010 SILC_TASK_PRI_NORMAL);
2013 /* Sends disconnect message to remote connection and disconnects the
2016 void silc_server_disconnect_remote(SilcServer server,
2017 SilcSocketConnection sock,
2018 const char *fmt, ...)
2021 unsigned char buf[4096];
2026 memset(buf, 0, sizeof(buf));
2028 vsprintf(buf, fmt, ap);
2031 SILC_LOG_DEBUG(("Disconnecting remote host"));
2033 SILC_LOG_INFO(("Disconnecting %s:%d [%s]", sock->hostname,
2035 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2036 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2037 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2040 /* Notify remote end that the conversation is over. The notify message
2041 is tried to be sent immediately. */
2042 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
2043 buf, strlen(buf), TRUE);
2045 /* Mark the connection to be disconnected */
2046 SILC_SET_DISCONNECTED(sock);
2047 silc_server_close_connection(server, sock);
2052 SilcClientEntry client;
2053 } *FreeClientInternal;
2055 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2057 FreeClientInternal i = (FreeClientInternal)context;
2059 silc_idlist_del_data(i->client);
2060 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2064 /* Frees client data and notifies about client's signoff. */
2066 void silc_server_free_client_data(SilcServer server,
2067 SilcSocketConnection sock,
2068 SilcClientEntry client,
2072 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2074 /* If there is pending outgoing data for the client then purge it
2075 to the network before removing the client entry. */
2076 if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
2077 (SILC_IS_DISCONNECTED(sock) == FALSE)) {
2078 server->stat.packets_sent++;
2080 if (sock->outbuf->data - sock->outbuf->head)
2081 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
2083 silc_server_packet_send_real(server, sock, TRUE);
2085 SILC_SET_CONNECTION_FOR_INPUT(sock->sock);
2086 SILC_UNSET_OUTBUF_PENDING(sock);
2087 silc_buffer_clear(sock->outbuf);
2090 /* Send SIGNOFF notify to routers. */
2091 if (notify && !server->standalone && server->router)
2092 silc_server_send_notify_signoff(server, server->router->connection,
2093 server->server_type == SILC_SERVER ?
2094 FALSE : TRUE, client->id,
2095 SILC_ID_CLIENT_LEN, signoff);
2097 /* Remove client from all channels */
2099 silc_server_remove_from_channels(server, NULL, client,
2100 TRUE, signoff, TRUE);
2102 silc_server_remove_from_channels(server, NULL, client,
2103 FALSE, NULL, FALSE);
2105 /* We will not delete the client entry right away. We will take it
2106 into history (for WHOWAS command) for 5 minutes */
2109 silc_task_register(server->timeout_queue, 0,
2110 silc_server_free_client_data_timeout,
2112 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2113 client->data.registered = FALSE;
2115 /* Free the client entry and everything in it */
2116 server->stat.my_clients--;
2117 server->stat.clients--;
2118 if (server->server_type == SILC_ROUTER)
2119 server->stat.cell_clients--;
2122 /* Frees user_data pointer from socket connection object. This also sends
2123 appropriate notify packets to the network to inform about leaving
2126 void silc_server_free_sock_user_data(SilcServer server,
2127 SilcSocketConnection sock)
2129 SILC_LOG_DEBUG(("Start"));
2131 switch(sock->type) {
2132 case SILC_SOCKET_TYPE_CLIENT:
2134 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2135 silc_server_free_client_data(server, sock, user_data, TRUE, NULL);
2138 case SILC_SOCKET_TYPE_SERVER:
2139 case SILC_SOCKET_TYPE_ROUTER:
2141 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2143 /* Free all client entries that this server owns as they will
2144 become invalid now as well. */
2145 silc_server_remove_clients_by_server(server, user_data, TRUE);
2147 /* If this was our primary router connection then we're lost to
2148 the outside world. */
2149 if (server->router == user_data) {
2150 server->id_entry->router = NULL;
2151 server->router = NULL;
2152 server->standalone = TRUE;
2155 /* Free the server entry */
2156 silc_idlist_del_data(user_data);
2157 silc_idlist_del_server(server->local_list, user_data);
2158 server->stat.my_servers--;
2159 server->stat.servers--;
2160 if (server->server_type == SILC_ROUTER)
2161 server->stat.cell_servers--;
2166 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2168 silc_idlist_del_data(user_data);
2169 silc_free(user_data);
2174 sock->user_data = NULL;
2177 /* This function is used to remove all client entries by the server `entry'.
2178 This is called when the connection is lost to the server. In this case
2179 we must invalidate all the client entries owned by the server `entry'.
2180 If the `server_signoff' is TRUE then the SERVER_SIGNOFF notify is
2181 distributed to our local clients. */
2183 int silc_server_remove_clients_by_server(SilcServer server,
2184 SilcServerEntry entry,
2187 SilcIDCacheList list = NULL;
2188 SilcIDCacheEntry id_cache = NULL;
2189 SilcClientEntry client = NULL;
2191 SilcClientEntry *clients = NULL;
2192 uint32 clients_c = 0;
2193 unsigned char **argv = NULL;
2194 uint32 *argv_lens = NULL, *argv_types = NULL, argc = 0;
2197 SILC_LOG_DEBUG(("Start"));
2199 if (server_signoff) {
2200 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2201 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2202 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) * (argc + 1));
2203 argv_types = silc_realloc(argv_types, sizeof(*argv_types) * (argc + 1));
2204 argv[argc] = idp->data;
2205 argv_lens[argc] = idp->len;
2206 argv_types[argc] = argc + 1;
2208 silc_buffer_free(idp);
2211 if (silc_idcache_find_by_id(server->local_list->clients,
2212 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2214 if (silc_idcache_list_first(list, &id_cache)) {
2216 client = (SilcClientEntry)id_cache->context;
2217 if (client->data.registered == FALSE) {
2218 if (!silc_idcache_list_next(list, &id_cache))
2224 if (client->router != entry) {
2225 if (server_signoff && client->connection) {
2226 clients = silc_realloc(clients,
2227 sizeof(*clients) * (clients_c + 1));
2228 clients[clients_c] = client;
2232 if (!silc_idcache_list_next(list, &id_cache))
2238 if (server_signoff) {
2239 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2240 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2241 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2243 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2245 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2246 memcpy(argv[argc], idp->data, idp->len);
2247 argv_lens[argc] = idp->len;
2248 argv_types[argc] = argc + 1;
2250 silc_buffer_free(idp);
2253 /* Remove the client entry */
2254 silc_server_remove_from_channels(server, NULL, client, FALSE,
2256 silc_idlist_del_client(server->local_list, client);
2258 if (!silc_idcache_list_next(list, &id_cache))
2262 silc_idcache_list_free(list);
2265 if (silc_idcache_find_by_id(server->global_list->clients,
2266 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2268 if (silc_idcache_list_first(list, &id_cache)) {
2270 client = (SilcClientEntry)id_cache->context;
2271 if (client->data.registered == FALSE) {
2272 if (!silc_idcache_list_next(list, &id_cache))
2278 if (client->router != entry) {
2279 if (server_signoff && client->connection) {
2280 clients = silc_realloc(clients,
2281 sizeof(*clients) * (clients_c + 1));
2282 clients[clients_c] = client;
2286 if (!silc_idcache_list_next(list, &id_cache))
2292 if (server_signoff) {
2293 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2294 argv = silc_realloc(argv, sizeof(*argv) * (argc + 1));
2295 argv_lens = silc_realloc(argv_lens, sizeof(*argv_lens) *
2297 argv_types = silc_realloc(argv_types, sizeof(*argv_types) *
2299 argv[argc] = silc_calloc(idp->len, sizeof(*argv[0]));
2300 memcpy(argv[argc], idp->data, idp->len);
2301 argv_lens[argc] = idp->len;
2302 argv_types[argc] = argc + 1;
2304 silc_buffer_free(idp);
2307 /* Remove the client entry */
2308 silc_server_remove_from_channels(server, NULL, client, FALSE,
2310 silc_idlist_del_client(server->global_list, client);
2312 if (!silc_idcache_list_next(list, &id_cache))
2316 silc_idcache_list_free(list);
2319 /* Send the SERVER_SIGNOFF notify */
2320 if (server_signoff) {
2323 /* Send SERVER_SIGNOFF notify to our primary router */
2324 if (!server->standalone && server->router) {
2325 args = silc_argument_payload_encode(1, argv, argv_lens,
2327 silc_server_send_notify_args(server,
2328 server->router->connection,
2329 server->server_type ==
2330 SILC_SERVER ? FALSE : TRUE,
2331 SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2333 silc_buffer_free(args);
2336 args = silc_argument_payload_encode(argc, argv, argv_lens,
2338 /* Send to local clients */
2339 for (i = 0; i < clients_c; i++) {
2340 silc_server_send_notify_args(server, clients[i]->connection,
2341 FALSE, SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
2346 silc_buffer_free(args);
2348 silc_free(argv_lens);
2349 silc_free(argv_types);
2355 /* Checks whether given channel has global users. If it does this returns
2356 TRUE and FALSE if there is only locally connected clients on the channel. */
2358 int silc_server_channel_has_global(SilcChannelEntry channel)
2360 SilcChannelClientEntry chl;
2362 silc_list_start(channel->user_list);
2363 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2364 if (chl->client->router)
2371 /* Checks whether given channel has locally connected users. If it does this
2372 returns TRUE and FALSE if there is not one locally connected client. */
2374 int silc_server_channel_has_local(SilcChannelEntry channel)
2376 SilcChannelClientEntry chl;
2378 silc_list_start(channel->user_list);
2379 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2380 if (!chl->client->router)
2387 /* Removes client from all channels it has joined. This is used when client
2388 connection is disconnected. If the client on a channel is last, the
2389 channel is removed as well. This sends the SIGNOFF notify types. */
2391 void silc_server_remove_from_channels(SilcServer server,
2392 SilcSocketConnection sock,
2393 SilcClientEntry client,
2395 char *signoff_message,
2398 SilcChannelEntry channel;
2399 SilcChannelClientEntry chl;
2402 SILC_LOG_DEBUG(("Start"));
2404 if (!client || !client->id)
2407 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2409 /* Remove the client from all channels. The client is removed from
2410 the channels' user list. */
2411 silc_list_start(client->channels);
2412 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2413 channel = chl->channel;
2415 /* Remove channel from client's channel list */
2416 silc_list_del(client->channels, chl);
2418 /* Remove channel if there is no users anymore */
2419 if (server->server_type == SILC_ROUTER &&
2420 silc_list_count(channel->user_list) < 2) {
2421 server->stat.my_channels--;
2424 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2426 if (channel->founder_key) {
2427 /* The founder auth data exists, do not remove the channel entry */
2428 SilcChannelClientEntry chl2;
2432 silc_list_start(channel->user_list);
2433 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2434 silc_list_del(chl2->client->channels, chl2);
2435 silc_list_del(channel->user_list, chl2);
2441 if (!silc_idlist_del_channel(server->local_list, channel))
2442 silc_idlist_del_channel(server->global_list, channel);
2446 /* Remove client from channel's client list */
2447 silc_list_del(channel->user_list, chl);
2449 server->stat.my_chanclients--;
2451 /* If there is no global users on the channel anymore mark the channel
2452 as local channel. */
2453 if (server->server_type == SILC_SERVER &&
2454 !silc_server_channel_has_global(channel))
2455 channel->global_users = FALSE;
2457 /* If there is not at least one local user on the channel then we don't
2458 need the channel entry anymore, we can remove it safely. */
2459 if (server->server_type == SILC_SERVER &&
2460 !silc_server_channel_has_local(channel)) {
2461 /* Notify about leaving client if this channel has global users. */
2462 if (notify && channel->global_users)
2463 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2464 SILC_NOTIFY_TYPE_SIGNOFF,
2465 signoff_message ? 2 : 1,
2466 clidp->data, clidp->len,
2467 signoff_message, signoff_message ?
2468 strlen(signoff_message) : 0);
2470 server->stat.my_channels--;
2473 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2475 if (channel->founder_key) {
2476 /* The founder auth data exists, do not remove the channel entry */
2477 SilcChannelClientEntry chl2;
2481 silc_list_start(channel->user_list);
2482 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2483 silc_list_del(chl2->client->channels, chl2);
2484 silc_list_del(channel->user_list, chl2);
2490 if (!silc_idlist_del_channel(server->local_list, channel))
2491 silc_idlist_del_channel(server->global_list, channel);
2495 /* Send notify to channel about client leaving SILC and thus
2496 the entire channel. */
2498 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2499 SILC_NOTIFY_TYPE_SIGNOFF,
2500 signoff_message ? 2 : 1,
2501 clidp->data, clidp->len,
2502 signoff_message, signoff_message ?
2503 strlen(signoff_message) : 0);
2505 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2506 /* Re-generate channel key */
2507 silc_server_create_channel_key(server, channel, 0);
2509 /* Send the channel key to the channel. The key of course is not sent
2510 to the client who was removed from the channel. */
2511 silc_server_send_channel_key(server, client->connection, channel,
2512 server->server_type == SILC_ROUTER ?
2513 FALSE : !server->standalone);
2517 silc_buffer_free(clidp);
2520 /* Removes client from one channel. This is used for example when client
2521 calls LEAVE command to remove itself from the channel. Returns TRUE
2522 if channel still exists and FALSE if the channel is removed when
2523 last client leaves the channel. If `notify' is FALSE notify messages
2526 int silc_server_remove_from_one_channel(SilcServer server,
2527 SilcSocketConnection sock,
2528 SilcChannelEntry channel,
2529 SilcClientEntry client,
2532 SilcChannelEntry ch;
2533 SilcChannelClientEntry chl;
2536 SILC_LOG_DEBUG(("Start"));
2538 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2540 /* Remove the client from the channel. The client is removed from
2541 the channel's user list. */
2542 silc_list_start(client->channels);
2543 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2544 if (chl->channel != channel)
2549 /* Remove channel from client's channel list */
2550 silc_list_del(client->channels, chl);
2552 /* Remove channel if there is no users anymore */
2553 if (server->server_type == SILC_ROUTER &&
2554 silc_list_count(channel->user_list) < 2) {
2556 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2557 if (!silc_idlist_del_channel(server->local_list, channel))
2558 silc_idlist_del_channel(server->global_list, channel);
2559 silc_buffer_free(clidp);
2560 server->stat.my_channels--;
2564 /* Remove client from channel's client list */
2565 silc_list_del(channel->user_list, chl);
2567 server->stat.my_chanclients--;
2569 /* If there is no global users on the channel anymore mark the channel
2570 as local channel. */
2571 if (server->server_type == SILC_SERVER &&
2572 !silc_server_channel_has_global(channel))
2573 channel->global_users = FALSE;
2575 /* If there is not at least one local user on the channel then we don't
2576 need the channel entry anymore, we can remove it safely. */
2577 if (server->server_type == SILC_SERVER &&
2578 !silc_server_channel_has_local(channel)) {
2579 /* Notify about leaving client if this channel has global users. */
2580 if (notify && channel->global_users)
2581 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2582 SILC_NOTIFY_TYPE_LEAVE, 1,
2583 clidp->data, clidp->len);
2585 server->stat.my_channels--;
2586 silc_buffer_free(clidp);
2589 silc_task_unregister_by_context(server->timeout_queue, channel->rekey);
2591 if (channel->founder_key) {
2592 /* The founder auth data exists, do not remove the channel entry */
2593 SilcChannelClientEntry chl2;
2597 silc_list_start(channel->user_list);
2598 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2599 silc_list_del(chl2->client->channels, chl2);
2600 silc_list_del(channel->user_list, chl2);
2606 if (!silc_idlist_del_channel(server->local_list, channel))
2607 silc_idlist_del_channel(server->global_list, channel);
2611 /* Send notify to channel about client leaving the channel */
2613 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2614 SILC_NOTIFY_TYPE_LEAVE, 1,
2615 clidp->data, clidp->len);
2619 silc_buffer_free(clidp);
2623 /* Returns TRUE if the given client is on the channel. FALSE if not.
2624 This works because we assure that the user list on the channel is
2625 always in up to date thus we can only check the channel list from
2626 `client' which is faster than checking the user list from `channel'. */
2628 int silc_server_client_on_channel(SilcClientEntry client,
2629 SilcChannelEntry channel)
2631 SilcChannelClientEntry chl;
2633 if (!client || !channel)
2636 silc_list_start(client->channels);
2637 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END)
2638 if (chl->channel == channel)
2644 /* Timeout callback. This is called if connection is idle or for some
2645 other reason is not responding within some period of time. This
2646 disconnects the remote end. */
2648 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2650 SilcServer server = (SilcServer)context;
2651 SilcSocketConnection sock = server->sockets[fd];
2656 if (sock->user_data)
2657 silc_server_free_sock_user_data(server, sock);
2659 silc_server_disconnect_remote(server, sock,
2660 "Server closed connection: "
2661 "Connection timeout");
2664 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2665 function may be used only by router. In real SILC network all channels
2666 are created by routers thus this function is never used by normal
2669 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2670 SilcServerID *router_id,
2676 SilcChannelID *channel_id;
2677 SilcChannelEntry entry;
2681 SILC_LOG_DEBUG(("Creating new channel"));
2684 cipher = "aes-256-cbc";
2686 hmac = "hmac-sha1-96";
2688 /* Allocate cipher */
2689 if (!silc_cipher_alloc(cipher, &key))
2693 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2694 silc_cipher_free(key);
2698 channel_name = strdup(channel_name);
2700 /* Create the channel */
2701 silc_id_create_channel_id(router_id, server->rng, &channel_id);
2702 entry = silc_idlist_add_channel(server->local_list, channel_name,
2703 SILC_CHANNEL_MODE_NONE, channel_id,
2704 NULL, key, newhmac);
2706 silc_free(channel_name);
2710 entry->cipher = strdup(cipher);
2711 entry->hmac_name = strdup(hmac);
2713 /* Now create the actual key material */
2714 silc_server_create_channel_key(server, entry,
2715 silc_cipher_get_key_len(key) / 8);
2717 /* Notify other routers about the new channel. We send the packet
2718 to our primary route. */
2719 if (broadcast && server->standalone == FALSE)
2720 silc_server_send_new_channel(server, server->router->connection, TRUE,
2721 channel_name, entry->id, SILC_ID_CHANNEL_LEN,
2724 server->stat.my_channels++;
2729 /* Same as above but creates the channel with Channel ID `channel_id. */
2732 silc_server_create_new_channel_with_id(SilcServer server,
2736 SilcChannelID *channel_id,
2739 SilcChannelEntry entry;
2743 SILC_LOG_DEBUG(("Creating new channel"));
2746 cipher = "aes-256-cbc";
2748 hmac = "hmac-sha1-96";
2750 /* Allocate cipher */
2751 if (!silc_cipher_alloc(cipher, &key))
2755 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2756 silc_cipher_free(key);
2760 channel_name = strdup(channel_name);
2762 /* Create the channel */
2763 entry = silc_idlist_add_channel(server->local_list, channel_name,
2764 SILC_CHANNEL_MODE_NONE, channel_id,
2765 NULL, key, newhmac);
2767 silc_free(channel_name);
2771 /* Now create the actual key material */
2772 silc_server_create_channel_key(server, entry,
2773 silc_cipher_get_key_len(key) / 8);
2775 /* Notify other routers about the new channel. We send the packet
2776 to our primary route. */
2777 if (broadcast && server->standalone == FALSE)
2778 silc_server_send_new_channel(server, server->router->connection, TRUE,
2779 channel_name, entry->id, SILC_ID_CHANNEL_LEN,
2782 server->stat.my_channels++;
2787 /* Channel's key re-key timeout callback. */
2789 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
2791 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
2792 SilcServer server = (SilcServer)rekey->context;
2794 silc_server_create_channel_key(server, rekey->channel, rekey->key_len);
2795 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
2797 silc_task_register(server->timeout_queue, 0,
2798 silc_server_channel_key_rekey,
2799 (void *)rekey, 3600 + 5, 0,
2801 SILC_TASK_PRI_NORMAL);
2804 /* Generates new channel key. This is used to create the initial channel key
2805 but also to re-generate new key for channel. If `key_len' is provided
2806 it is the bytes of the key length. */
2808 void silc_server_create_channel_key(SilcServer server,
2809 SilcChannelEntry channel,
2813 unsigned char channel_key[32], hash[32];
2816 SILC_LOG_DEBUG(("Generating channel key"));
2818 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
2819 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
2823 if (!channel->channel_key)
2824 if (!silc_cipher_alloc("aes-256-cbc", &channel->channel_key))
2829 else if (channel->key_len)
2830 len = channel->key_len / 8;
2832 len = silc_cipher_get_key_len(channel->channel_key) / 8;
2834 /* Create channel key */
2835 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
2838 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
2840 /* Remove old key if exists */
2842 memset(channel->key, 0, channel->key_len / 8);
2843 silc_free(channel->key);
2847 channel->key_len = len * 8;
2848 channel->key = silc_calloc(len, sizeof(*channel->key));
2849 memcpy(channel->key, channel_key, len);
2850 memset(channel_key, 0, sizeof(channel_key));
2852 /* Generate HMAC key from the channel key data and set it */
2854 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2855 silc_hash_make(channel->hmac->hash, channel->key, len, hash);
2856 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2857 memset(hash, 0, sizeof(hash));
2859 if (server->server_type == SILC_ROUTER) {
2860 if (!channel->rekey)
2861 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
2862 channel->rekey->context = (void *)server;
2863 channel->rekey->channel = channel;
2864 channel->rekey->key_len = key_len;
2866 silc_task_unregister_by_callback(server->timeout_queue,
2867 silc_server_channel_key_rekey);
2868 silc_task_register(server->timeout_queue, 0,
2869 silc_server_channel_key_rekey,
2870 (void *)channel->rekey, 3600 + 5, 0,
2872 SILC_TASK_PRI_NORMAL);
2876 /* Saves the channel key found in the encoded `key_payload' buffer. This
2877 function is used when we receive Channel Key Payload and also when we're
2878 processing JOIN command reply. Returns entry to the channel. */
2880 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
2881 SilcBuffer key_payload,
2882 SilcChannelEntry channel)
2884 SilcChannelKeyPayload payload = NULL;
2885 SilcChannelID *id = NULL;
2886 unsigned char *tmp, hash[32];
2890 SILC_LOG_DEBUG(("Start"));
2892 /* Decode channel key payload */
2893 payload = silc_channel_key_payload_parse(key_payload);
2895 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
2900 /* Get the channel entry */
2903 /* Get channel ID */
2904 tmp = silc_channel_key_get_id(payload, &tmp_len);
2905 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
2911 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
2913 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
2915 SILC_LOG_ERROR(("Received key for non-existent channel"));
2921 tmp = silc_channel_key_get_key(payload, &tmp_len);
2927 cipher = silc_channel_key_get_cipher(payload, NULL);
2933 /* Remove old key if exists */
2935 memset(channel->key, 0, channel->key_len / 8);
2936 silc_free(channel->key);
2937 silc_cipher_free(channel->channel_key);
2940 /* Create new cipher */
2941 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
2946 if (channel->cipher)
2947 silc_free(channel->cipher);
2948 channel->cipher = strdup(cipher);
2951 channel->key_len = tmp_len * 8;
2952 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
2953 memcpy(channel->key, tmp, tmp_len);
2954 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
2956 /* Generate HMAC key from the channel key data and set it */
2958 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2959 silc_hash_make(channel->hmac->hash, tmp, tmp_len, hash);
2960 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2962 memset(hash, 0, sizeof(hash));
2963 memset(tmp, 0, tmp_len);
2965 if (server->server_type == SILC_ROUTER) {
2966 if (!channel->rekey)
2967 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
2968 channel->rekey->context = (void *)server;
2969 channel->rekey->channel = channel;
2971 silc_task_unregister_by_callback(server->timeout_queue,
2972 silc_server_channel_key_rekey);
2973 silc_task_register(server->timeout_queue, 0,
2974 silc_server_channel_key_rekey,
2975 (void *)channel->rekey, 3600 + 5, 0,
2977 SILC_TASK_PRI_NORMAL);
2984 silc_channel_key_payload_free(payload);
2989 /* Heartbeat callback. This function is set as argument for the
2990 silc_socket_set_heartbeat function. The library will call this function
2991 at the set time interval. */
2993 void silc_server_perform_heartbeat(SilcSocketConnection sock,
2996 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
2998 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname,
3001 /* Send the heartbeat */
3002 silc_server_send_heartbeat(hb->server, sock);
3005 /* Returns assembled of all servers in the given ID list. The packet's
3006 form is dictated by the New ID payload. */
3008 static void silc_server_announce_get_servers(SilcServer server,
3010 SilcBuffer *servers)
3012 SilcIDCacheList list;
3013 SilcIDCacheEntry id_cache;
3014 SilcServerEntry entry;
3017 /* Go through all clients in the list */
3018 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
3019 SILC_ID_SERVER, &list)) {
3020 if (silc_idcache_list_first(list, &id_cache)) {
3022 entry = (SilcServerEntry)id_cache->context;
3024 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3026 *servers = silc_buffer_realloc(*servers,
3028 (*servers)->truelen + idp->len :
3030 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3031 silc_buffer_put(*servers, idp->data, idp->len);
3032 silc_buffer_pull(*servers, idp->len);
3033 silc_buffer_free(idp);
3035 if (!silc_idcache_list_next(list, &id_cache))
3040 silc_idcache_list_free(list);
3044 /* This function is used by router to announce existing servers to our
3045 primary router when we've connected to it. */
3047 void silc_server_announce_servers(SilcServer server)
3049 SilcBuffer servers = NULL;
3051 SILC_LOG_DEBUG(("Announcing servers"));
3053 /* Get servers in local list */
3054 silc_server_announce_get_servers(server, server->local_list, &servers);
3056 /* Get servers in global list */
3057 silc_server_announce_get_servers(server, server->global_list, &servers);
3060 silc_buffer_push(servers, servers->data - servers->head);
3061 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3063 /* Send the packet */
3064 silc_server_packet_send(server, server->router->connection,
3065 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3066 servers->data, servers->len, TRUE);
3068 silc_buffer_free(servers);
3072 /* Returns assembled packet of all clients in the given ID list. The
3073 packet's form is dictated by the New ID Payload. */
3075 static void silc_server_announce_get_clients(SilcServer server,
3077 SilcBuffer *clients)
3079 SilcIDCacheList list;
3080 SilcIDCacheEntry id_cache;
3081 SilcClientEntry client;
3084 /* Go through all clients in the list */
3085 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
3086 SILC_ID_CLIENT, &list)) {
3087 if (silc_idcache_list_first(list, &id_cache)) {
3089 client = (SilcClientEntry)id_cache->context;
3091 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3093 *clients = silc_buffer_realloc(*clients,
3095 (*clients)->truelen + idp->len :
3097 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3098 silc_buffer_put(*clients, idp->data, idp->len);
3099 silc_buffer_pull(*clients, idp->len);
3100 silc_buffer_free(idp);
3102 if (!silc_idcache_list_next(list, &id_cache))
3107 silc_idcache_list_free(list);
3111 /* This function is used to announce our existing clients to our router
3112 when we've connected to it. */
3114 void silc_server_announce_clients(SilcServer server)
3116 SilcBuffer clients = NULL;
3118 SILC_LOG_DEBUG(("Announcing clients"));
3120 /* Get clients in local list */
3121 silc_server_announce_get_clients(server, server->local_list,
3124 /* As router we announce our global list as well */
3125 if (server->server_type == SILC_ROUTER)
3126 silc_server_announce_get_clients(server, server->global_list,
3130 silc_buffer_push(clients, clients->data - clients->head);
3131 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3133 /* Send the packet */
3134 silc_server_packet_send(server, server->router->connection,
3135 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3136 clients->data, clients->len, TRUE);
3138 silc_buffer_free(clients);
3143 silc_server_announce_encode_join(uint32 argc, ...)
3148 return silc_notify_payload_encode(SILC_NOTIFY_TYPE_JOIN, argc, ap);
3151 /* Returns assembled packets for channel users of the `channel'. */
3153 void silc_server_announce_get_channel_users(SilcServer server,
3154 SilcChannelEntry channel,
3155 SilcBuffer *channel_users)
3157 SilcChannelClientEntry chl;
3158 SilcBuffer chidp, clidp;
3162 SILC_LOG_DEBUG(("Start"));
3164 /* Now find all users on the channel */
3165 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3166 silc_list_start(channel->user_list);
3167 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
3168 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3169 tmp = silc_server_announce_encode_join(2, clidp->data, clidp->len,
3170 chidp->data, chidp->len);
3173 silc_buffer_realloc(*channel_users,
3175 (*channel_users)->truelen + len : len));
3176 silc_buffer_pull_tail(*channel_users,
3177 ((*channel_users)->end -
3178 (*channel_users)->data));
3180 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3181 silc_buffer_pull(*channel_users, len);
3182 silc_buffer_free(clidp);
3183 silc_buffer_free(tmp);
3185 silc_buffer_free(chidp);
3188 /* Returns assembled packets for all channels and users on those channels
3189 from the given ID List. The packets are in the form dictated by the
3190 New Channel and New Channel User payloads. */
3192 void silc_server_announce_get_channels(SilcServer server,
3194 SilcBuffer *channels,
3195 SilcBuffer *channel_users)
3197 SilcIDCacheList list;
3198 SilcIDCacheEntry id_cache;
3199 SilcChannelEntry channel;
3204 SILC_LOG_DEBUG(("Start"));
3206 /* Go through all channels in the list */
3207 if (silc_idcache_find_by_id(id_list->channels, SILC_ID_CACHE_ANY,
3208 SILC_ID_CHANNEL, &list)) {
3209 if (silc_idcache_list_first(list, &id_cache)) {
3211 channel = (SilcChannelEntry)id_cache->context;
3213 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3214 name_len = strlen(channel->channel_name);
3216 len = 4 + name_len + SILC_ID_CHANNEL_LEN + 4;
3218 silc_buffer_realloc(*channels,
3219 (*channels ? (*channels)->truelen + len : len));
3220 silc_buffer_pull_tail(*channels,
3221 ((*channels)->end - (*channels)->data));
3222 silc_buffer_format(*channels,
3223 SILC_STR_UI_SHORT(name_len),
3224 SILC_STR_UI_XNSTRING(channel->channel_name,
3226 SILC_STR_UI_SHORT(SILC_ID_CHANNEL_LEN),
3227 SILC_STR_UI_XNSTRING(cid, SILC_ID_CHANNEL_LEN),
3228 SILC_STR_UI_INT(channel->mode),
3230 silc_buffer_pull(*channels, len);
3232 silc_server_announce_get_channel_users(server, channel,
3237 if (!silc_idcache_list_next(list, &id_cache))
3242 silc_idcache_list_free(list);
3246 /* This function is used to announce our existing channels to our router
3247 when we've connected to it. This also announces the users on the
3248 channels to the router. */
3250 void silc_server_announce_channels(SilcServer server)
3252 SilcBuffer channels = NULL, channel_users = NULL;
3254 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3256 /* Get channels and channel users in local list */
3257 silc_server_announce_get_channels(server, server->local_list,
3258 &channels, &channel_users);
3260 /* Get channels and channel users in global list */
3261 silc_server_announce_get_channels(server, server->global_list,
3262 &channels, &channel_users);
3265 silc_buffer_push(channels, channels->data - channels->head);
3266 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3268 /* Send the packet */
3269 silc_server_packet_send(server, server->router->connection,
3270 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3271 channels->data, channels->len,
3274 silc_buffer_free(channels);
3277 if (channel_users) {
3278 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3279 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3280 channel_users->len);
3282 /* Send the packet */
3283 silc_server_packet_send(server, server->router->connection,
3284 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3285 channel_users->data, channel_users->len,
3288 silc_buffer_free(channel_users);
3292 /* Failure timeout callback. If this is called then we will immediately
3293 process the received failure. We always process the failure with timeout
3294 since we do not want to blindly trust to received failure packets.
3295 This won't be called (the timeout is cancelled) if the failure was
3296 bogus (it is bogus if remote does not close the connection after sending
3299 SILC_TASK_CALLBACK(silc_server_failure_callback)
3301 SilcServerFailureContext f = (SilcServerFailureContext)context;
3303 if (f->sock->protocol) {
3304 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3305 f->sock->protocol->execute(f->server->timeout_queue, 0,
3306 f->sock->protocol, f->sock->sock, 0, 0);
3312 /* Assembles user list and users mode list from the `channel'. */
3314 void silc_server_get_users_on_channel(SilcServer server,
3315 SilcChannelEntry channel,
3316 SilcBuffer *user_list,
3317 SilcBuffer *mode_list,
3320 SilcChannelClientEntry chl;
3321 SilcBuffer client_id_list;
3322 SilcBuffer client_mode_list;
3324 uint32 list_count = 0;
3326 client_id_list = silc_buffer_alloc((SILC_ID_CLIENT_LEN + 4) *
3327 silc_list_count(channel->user_list));
3328 client_mode_list = silc_buffer_alloc(4 *
3329 silc_list_count(channel->user_list));
3330 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3331 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3332 silc_list_start(channel->user_list);
3333 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
3335 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3336 silc_buffer_put(client_id_list, idp->data, idp->len);
3337 silc_buffer_pull(client_id_list, idp->len);
3338 silc_buffer_free(idp);
3340 /* Client's mode on channel */
3341 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3342 silc_buffer_pull(client_mode_list, 4);
3346 silc_buffer_push(client_id_list,
3347 client_id_list->data - client_id_list->head);
3348 silc_buffer_push(client_mode_list,
3349 client_mode_list->data - client_mode_list->head);
3351 *user_list = client_id_list;
3352 *mode_list = client_mode_list;
3353 *user_count = list_count;
3356 /* Saves users and their modes to the `channel'. */
3358 void silc_server_save_users_on_channel(SilcServer server,
3359 SilcSocketConnection sock,
3360 SilcChannelEntry channel,
3361 SilcClientID *noadd,
3362 SilcBuffer user_list,
3363 SilcBuffer mode_list,
3368 /* Cache the received Client ID's and modes. This cache expires
3369 whenever server sends notify message to channel. It means two things;
3370 some user has joined or leaved the channel. XXX TODO! */
3371 for (i = 0; i < user_count; i++) {
3374 SilcClientID *client_id;
3375 SilcClientEntry client;
3378 SILC_GET16_MSB(idp_len, user_list->data + 2);
3380 client_id = silc_id_payload_parse_id(user_list->data, idp_len);
3381 silc_buffer_pull(user_list, idp_len);
3386 SILC_GET32_MSB(mode, mode_list->data);
3387 silc_buffer_pull(mode_list, 4);
3389 if (noadd && !SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3390 silc_free(client_id);
3394 /* Check if we have this client cached already. */
3395 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3398 client = silc_idlist_find_client_by_id(server->global_list,
3401 /* If router did not find such Client ID in its lists then this must
3402 be bogus client or some router in the net is buggy. */
3403 if (server->server_type == SILC_ROUTER) {
3404 silc_free(client_id);
3408 /* We don't have that client anywhere, add it. The client is added
3409 to global list since server didn't have it in the lists so it must be
3411 client = silc_idlist_add_client(server->global_list, NULL, 0, NULL,
3413 silc_id_dup(client_id, SILC_ID_CLIENT),
3414 sock->user_data, NULL);
3416 silc_free(client_id);
3420 client->data.registered = TRUE;
3423 silc_free(client_id);
3425 if (!silc_server_client_on_channel(client, channel)) {
3426 /* Client was not on the channel, add it. */
3427 SilcChannelClientEntry chl = silc_calloc(1, sizeof(*chl));
3428 chl->client = client;
3430 chl->channel = channel;
3431 silc_list_add(channel->user_list, chl);
3432 silc_list_add(client->channels, chl);
3437 /* Lookups route to the client indicated by the `id_data'. The connection
3438 object and internal data object is returned. Returns NULL if route
3439 could not be found to the client. If the `client_id' is specified then
3440 it is used and the `id_data' is ignored. */
3442 SilcSocketConnection silc_server_get_client_route(SilcServer server,
3443 unsigned char *id_data,
3445 SilcClientID *client_id,
3446 SilcIDListData *idata)
3449 SilcClientEntry client;
3451 SILC_LOG_DEBUG(("Start"));
3453 /* Decode destination Client ID */
3455 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
3457 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
3461 id = silc_id_dup(client_id, SILC_ID_CLIENT);
3464 /* If the destination belongs to our server we don't have to route
3465 the packet anywhere but to send it to the local destination. */
3466 client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
3470 if (client && client->data.registered == FALSE)
3473 /* If we are router and the client has router then the client is in
3474 our cell but not directly connected to us. */
3475 if (server->server_type == SILC_ROUTER && client->router) {
3476 /* We are of course in this case the client's router thus the real
3477 "router" of the client is the server who owns the client. Thus
3478 we will send the packet to that server. */
3480 *idata = (SilcIDListData)client->router;
3481 return client->router->connection;
3484 /* Seems that client really is directly connected to us */
3486 *idata = (SilcIDListData)client;
3487 return client->connection;
3490 /* Destination belongs to someone not in this server. If we are normal
3491 server our action is to send the packet to our router. */
3492 if (server->server_type == SILC_SERVER && !server->standalone) {
3495 *idata = (SilcIDListData)server->router;
3496 return server->router->connection;
3499 /* We are router and we will perform route lookup for the destination
3500 and send the packet to fastest route. */
3501 if (server->server_type == SILC_ROUTER && !server->standalone) {
3502 /* Check first that the ID is valid */
3503 client = silc_idlist_find_client_by_id(server->global_list, id, NULL);
3505 SilcSocketConnection dst_sock;
3507 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
3511 *idata = (SilcIDListData)dst_sock->user_data;
3520 /* Encodes and returns channel list of channels the `client' has joined.
3521 Secret channels are not put to the list. */
3523 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
3524 SilcClientEntry client)
3526 SilcBuffer buffer = NULL;
3527 SilcChannelEntry channel;
3528 SilcChannelClientEntry chl;
3533 silc_list_start(client->channels);
3534 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
3535 channel = chl->channel;
3537 if (channel->mode & SILC_CHANNEL_MODE_SECRET)
3540 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3541 name_len = strlen(channel->channel_name);
3543 len = 4 + name_len + SILC_ID_CHANNEL_LEN + 4;
3544 buffer = silc_buffer_realloc(buffer,
3545 (buffer ? (buffer)->truelen + len : len));
3546 silc_buffer_pull_tail(buffer, ((buffer)->end - (buffer)->data));
3547 silc_buffer_format(buffer,
3548 SILC_STR_UI_SHORT(name_len),
3549 SILC_STR_UI_XNSTRING(channel->channel_name,
3551 SILC_STR_UI_SHORT(SILC_ID_CHANNEL_LEN),
3552 SILC_STR_UI_XNSTRING(cid, SILC_ID_CHANNEL_LEN),
3553 SILC_STR_UI_INT(chl->mode), /* Client's mode */
3555 silc_buffer_pull(buffer, len);
3560 silc_buffer_push(buffer, buffer->data - buffer->head);
3565 /* Finds client entry by Client ID and if it is not found then resolves
3566 it using WHOIS command. */
3568 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
3569 SilcClientID *client_id)
3571 SilcClientEntry client;
3573 client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL);
3575 client = silc_idlist_find_client_by_id(server->global_list,
3577 if (!client && server->server_type == SILC_ROUTER)
3581 if (!client && server->standalone)
3584 if (!client || !client->nickname || !client->username) {
3585 SilcBuffer buffer, idp;
3587 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
3588 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
3589 ++server->cmd_ident, 1,
3590 3, idp->data, idp->len);
3591 silc_server_packet_send(server, client ? client->router->connection :
3592 server->router->connection,
3593 SILC_PACKET_COMMAND, 0,
3594 buffer->data, buffer->len, FALSE);
3595 silc_buffer_free(idp);
3596 silc_buffer_free(buffer);
3602 /* A timeout callback for the re-key. We will be the initiator of the
3605 SILC_TASK_CALLBACK(silc_server_rekey_callback)
3607 SilcSocketConnection sock = (SilcSocketConnection)context;
3608 SilcIDListData idata = (SilcIDListData)sock->user_data;
3609 SilcServer server = (SilcServer)idata->rekey->context;
3610 SilcProtocol protocol;
3611 SilcServerRekeyInternalContext *proto_ctx;
3613 SILC_LOG_DEBUG(("Start"));
3615 /* Allocate internal protocol context. This is sent as context
3617 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
3618 proto_ctx->server = (void *)server;
3619 proto_ctx->sock = sock;
3620 proto_ctx->responder = FALSE;
3621 proto_ctx->pfs = idata->rekey->pfs;
3623 /* Perform rekey protocol. Will call the final callback after the
3624 protocol is over. */
3625 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
3626 &protocol, proto_ctx, silc_server_rekey_final);
3627 sock->protocol = protocol;
3629 /* Run the protocol */
3630 protocol->execute(server->timeout_queue, 0, protocol,
3633 /* Re-register re-key timeout */
3634 silc_task_register(server->timeout_queue, sock->sock,
3635 silc_server_rekey_callback,
3636 context, idata->rekey->timeout, 0,
3637 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
3640 /* The final callback for the REKEY protocol. This will actually take the
3641 new key material into use. */
3643 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
3645 SilcProtocol protocol = (SilcProtocol)context;
3646 SilcServerRekeyInternalContext *ctx =
3647 (SilcServerRekeyInternalContext *)protocol->context;
3648 SilcServer server = (SilcServer)ctx->server;
3649 SilcSocketConnection sock = ctx->sock;
3651 SILC_LOG_DEBUG(("Start"));
3653 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
3654 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
3655 /* Error occured during protocol */
3656 silc_protocol_cancel(server->timeout_queue, protocol);
3657 silc_protocol_free(protocol);
3658 sock->protocol = NULL;
3660 silc_packet_context_free(ctx->packet);
3662 silc_ske_free(ctx->ske);
3667 /* Take the keys into use */
3668 if (ctx->pfs == TRUE)
3669 silc_server_protocol_rekey_generate_pfs(server, ctx);
3671 silc_server_protocol_rekey_generate(server, ctx);
3674 silc_protocol_free(protocol);
3675 sock->protocol = NULL;
3677 silc_packet_context_free(ctx->packet);
3679 silc_ske_free(ctx->ske);