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);
43 /* Allocates a new SILC server object. This has to be done before the server
44 can be used. After allocation one must call silc_server_init to initialize
45 the server. The new allocated server object is returned to the new_server
48 int silc_server_alloc(SilcServer *new_server)
52 SILC_LOG_DEBUG(("Allocating new server object"));
54 server = silc_calloc(1, sizeof(*server));
55 server->server_type = SILC_SERVER;
56 server->standalone = TRUE;
57 server->local_list = silc_calloc(1, sizeof(*server->local_list));
58 server->global_list = silc_calloc(1, sizeof(*server->global_list));
59 server->pending_commands = silc_dlist_init();
61 server->sim = silc_dlist_init();
69 /* Free's the SILC server object. This is called at the very end before
72 void silc_server_free(SilcServer server)
79 if (server->local_list)
80 silc_free(server->local_list);
81 if (server->global_list)
82 silc_free(server->global_list);
84 silc_rng_free(server->rng);
87 while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
88 silc_dlist_del(server->sim, sim);
91 silc_dlist_uninit(server->sim);
95 silc_free(server->params);
97 if (server->pending_commands)
98 silc_dlist_uninit(server->pending_commands);
104 /* Initializes the entire SILC server. This is called always before running
105 the server. This is called only once at the initialization of the program.
106 This binds the server to its listenning port. After this function returns
107 one should call silc_server_run to start the server. This returns TRUE
108 when everything is ok to run the server. Configuration file must be
109 read and parsed before calling this. */
111 int silc_server_init(SilcServer server)
113 int *sock = NULL, sock_count = 0, i;
115 SilcServerEntry id_entry;
116 SilcIDListPurge purge;
118 SILC_LOG_DEBUG(("Initializing server"));
120 assert(server->config);
122 /* XXX After server is made as Silc Server Library this can be given
123 as argument, for now this is hard coded */
124 server->params = silc_calloc(1, sizeof(*server->params));
125 server->params->retry_count = SILC_SERVER_RETRY_COUNT;
126 server->params->retry_interval_min = SILC_SERVER_RETRY_INTERVAL_MIN;
127 server->params->retry_interval_max = SILC_SERVER_RETRY_INTERVAL_MAX;
128 server->params->retry_keep_trying = FALSE;
129 server->params->protocol_timeout = 60;
130 server->params->require_reverse_mapping = FALSE;
132 /* Set log files where log message should be saved. */
133 server->config->server = server;
134 silc_server_config_setlogfiles(server->config);
136 /* Register all configured ciphers, PKCS and hash functions. */
137 silc_server_config_register_ciphers(server->config);
138 silc_server_config_register_pkcs(server->config);
139 silc_server_config_register_hashfuncs(server->config);
140 silc_server_config_register_hmacs(server->config);
142 /* Initialize random number generator for the server. */
143 server->rng = silc_rng_alloc();
144 silc_rng_init(server->rng);
145 silc_rng_global_init(server->rng);
147 /* Initialize hash functions for server to use */
148 silc_hash_alloc("md5", &server->md5hash);
149 silc_hash_alloc("sha1", &server->sha1hash);
151 /* Initialize none cipher */
152 silc_cipher_alloc("none", &server->none_cipher);
154 /* XXXXX Generate RSA key pair */
156 unsigned char *public_key;
157 unsigned char *private_key;
158 unsigned int pk_len, prv_len;
161 if (stat("pubkey.pub", &st) < 0 && stat("privkey.prv", &st) < 0) {
163 if (silc_pkcs_alloc("rsa", &server->pkcs) == FALSE) {
164 SILC_LOG_ERROR(("Could not create RSA key pair"));
168 if (server->pkcs->pkcs->init(server->pkcs->context,
169 1024, server->rng) == FALSE) {
170 SILC_LOG_ERROR(("Could not generate RSA key pair"));
174 public_key = server->pkcs->pkcs->get_public_key(server->pkcs->context,
176 private_key = server->pkcs->pkcs->get_private_key(server->pkcs->context,
179 SILC_LOG_HEXDUMP(("public key"), public_key, pk_len);
180 SILC_LOG_HEXDUMP(("private key"), private_key, prv_len);
183 silc_pkcs_public_key_alloc("rsa", "UN=root, HN=dummy",
185 server->private_key =
186 silc_pkcs_private_key_alloc("rsa", private_key, prv_len);
189 silc_pkcs_save_public_key("pubkey.pub", server->public_key,
191 silc_pkcs_save_private_key("privkey.prv", server->private_key, NULL,
194 memset(public_key, 0, pk_len);
195 memset(private_key, 0, prv_len);
196 silc_free(public_key);
197 silc_free(private_key);
199 silc_pkcs_load_public_key("pubkey.pub", &server->public_key,
201 silc_pkcs_load_private_key("privkey.prv", &server->private_key,
206 /* Create a listening server. Note that our server can listen on
207 multiple ports. All listeners are created here and now. */
208 /* XXX Still check this whether to use server_info or listen_port. */
210 while(server->config->listen_port) {
213 tmp = silc_net_create_server(server->config->listen_port->port,
214 server->config->listen_port->host);
218 sock = silc_realloc(sock, (sizeof(int *) * (sock_count + 1)));
219 sock[sock_count] = tmp;
220 server->config->listen_port = server->config->listen_port->next;
224 /* Initialize ID caches */
225 server->local_list->clients =
226 silc_idcache_alloc(0, silc_idlist_client_destructor);
227 server->local_list->servers = silc_idcache_alloc(0, NULL);
228 server->local_list->channels = silc_idcache_alloc(0, NULL);
230 /* These are allocated for normal server as well as these hold some
231 global information that the server has fetched from its router. For
232 router these are used as they are supposed to be used on router. */
233 server->global_list->clients =
234 silc_idcache_alloc(0, silc_idlist_client_destructor);
235 server->global_list->servers = silc_idcache_alloc(0, NULL);
236 server->global_list->channels = silc_idcache_alloc(0, NULL);
238 /* Allocate the entire socket list that is used in server. Eventually
239 all connections will have entry in this table (it is a table of
240 pointers to the actual object that is allocated individually
242 server->sockets = silc_calloc(SILC_SERVER_MAX_CONNECTIONS,
243 sizeof(*server->sockets));
245 for (i = 0; i < sock_count; i++) {
246 SilcSocketConnection newsocket = NULL;
248 /* Set socket to non-blocking mode */
249 silc_net_set_socket_nonblock(sock[i]);
250 server->sock = sock[i];
252 /* Create a Server ID for the server. */
253 silc_id_create_server_id(sock[i], server->rng, &id);
259 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
260 server->id_string_len = silc_id_get_len(SILC_ID_SERVER);
261 server->id_type = SILC_ID_SERVER;
262 server->server_name = server->config->server_info->server_name;
264 /* Add ourselves to the server list. We don't have a router yet
265 beacuse we haven't established a route yet. It will be done later.
266 For now, NULL is sent as router. This allocates new entry to
269 silc_idlist_add_server(server->local_list,
270 server->config->server_info->server_name,
271 server->server_type, server->id, NULL, NULL);
273 SILC_LOG_ERROR(("Could not add ourselves to cache"));
277 /* Add ourselves also to the socket table. The entry allocated above
278 is sent as argument for fast referencing in the future. */
279 silc_socket_alloc(sock[i], SILC_SOCKET_TYPE_SERVER, id_entry,
282 server->sockets[sock[i]] = newsocket;
284 /* Put the allocated socket pointer also to the entry allocated above
285 for fast back-referencing to the socket list. */
286 id_entry->connection = (void *)server->sockets[sock[i]];
287 server->id_entry = id_entry;
290 /* Register the task queues. In SILC we have by default three task queues.
291 One task queue for non-timeout tasks which perform different kind of
292 I/O on file descriptors, timeout task queue for timeout tasks, and,
293 generic non-timeout task queue whose tasks apply to all connections. */
294 silc_task_queue_alloc(&server->io_queue, TRUE);
295 if (!server->io_queue) {
298 silc_task_queue_alloc(&server->timeout_queue, TRUE);
299 if (!server->timeout_queue) {
302 silc_task_queue_alloc(&server->generic_queue, TRUE);
303 if (!server->generic_queue) {
307 /* Register protocols */
308 silc_server_protocols_register();
310 /* Initialize the scheduler */
311 silc_schedule_init(&server->io_queue, &server->timeout_queue,
312 &server->generic_queue,
313 SILC_SERVER_MAX_CONNECTIONS);
315 /* Add the first task to the queue. This is task that is executed by
316 timeout. It expires as soon as the caller calls silc_server_run. This
317 task performs authentication protocol and key exchange with our
319 silc_task_register(server->timeout_queue, sock[0],
320 silc_server_connect_to_router,
321 (void *)server, 0, 1,
323 SILC_TASK_PRI_NORMAL);
325 /* Add listener task to the queue. This task receives new connections to the
326 server. This task remains on the queue until the end of the program. */
327 silc_task_register(server->io_queue, sock[0],
328 silc_server_accept_new_connection,
329 (void *)server, 0, 0,
331 SILC_TASK_PRI_NORMAL);
332 server->listenning = TRUE;
334 /* If server connections has been configured then we must be router as
335 normal server cannot have server connections, only router connections. */
336 if (server->config->servers)
337 server->server_type = SILC_ROUTER;
339 /* Register the ID Cache purge task. This periodically purges the ID cache
340 and removes the expired cache entries. */
342 /* Clients local list */
343 purge = silc_calloc(1, sizeof(*purge));
344 purge->cache = server->local_list->clients;
345 purge->timeout_queue = server->timeout_queue;
346 silc_task_register(purge->timeout_queue, 0,
348 (void *)purge, 600, 0,
349 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
351 /* Clients global list */
352 purge = silc_calloc(1, sizeof(*purge));
353 purge->cache = server->global_list->clients;
354 purge->timeout_queue = server->timeout_queue;
355 silc_task_register(purge->timeout_queue, 0,
357 (void *)purge, 300, 0,
358 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
360 SILC_LOG_DEBUG(("Server initialized"));
362 /* We are done here, return succesfully */
365 silc_task_queue_free(server->timeout_queue);
367 silc_task_queue_free(server->io_queue);
369 for (i = 0; i < sock_count; i++)
370 silc_net_close_server(sock[i]);
375 /* Fork server to background and set gid+uid to non-root.
376 Silcd will not run as root, so trying to set either user or group to
377 root will cause silcd to exit. */
379 void silc_server_daemonise(SilcServer server)
381 /* Are we executing silcd as root or a regular user? */
388 if (!server->config->identity || !server->config->identity->user ||
389 !server->config->identity->group) {
390 fprintf(stderr, "Error:"
391 "\tSILC server must not be run as root. For the security of your\n"
392 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
393 "\tuser account. Modify the [Identity] configuration section to run\n"
394 "\tthe server as non-root user.\n");
398 /* Get the values given for user and group in configuration file */
399 user=server->config->identity->user;
400 group=server->config->identity->group;
402 /* Check whether the user/group information is text */
403 if (atoi(user)!=0 || atoi(group)!=0) {
404 SILC_LOG_DEBUG(("Invalid user and/or group information"));
405 SILC_LOG_DEBUG(("User and/or group given as number"));
406 fprintf(stderr, "Invalid user and/or group information\n");
407 fprintf(stderr, "Please assign them as names, not numbers\n");
411 /* Catch the nasty incident of string "0" returning 0 from atoi */
412 if (strcmp("0", user)==0 || strcmp("0", group)==0) {
413 SILC_LOG_DEBUG(("User and/or group configured to 0. Unacceptable"));
414 fprintf(stderr, "User and/or group configured to 0. Exiting\n");
422 fprintf(stderr, "No such user %s found\n", user);
427 fprintf(stderr, "No such group %s found\n", group);
431 /* Check whether user and/or group is set to root. If yes, exit
432 immediately. Otherwise, setgid and setuid server to user.group */
433 if (gr->gr_gid==0 || pw->pw_uid==0) {
434 fprintf(stderr, "Error:"
435 "\tSILC server must not be run as root. For the security of your\n"
436 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
437 "\tuser account. Modify the [Identity] configuration section to run\n"
438 "\tthe server as non-root user.\n");
441 /* Fork server to background, making it a daemon */
443 SILC_LOG_DEBUG(("Server started as root. Dropping privileges."));
444 SILC_LOG_DEBUG(("Forking SILC server to background"));
449 SILC_LOG_DEBUG(("Changing to group %s", group));
450 if(setgid(gr->gr_gid)==0) {
451 SILC_LOG_DEBUG(("Setgid to %s", group));
453 SILC_LOG_DEBUG(("Setgid to %s failed", group));
454 fprintf(stderr, "Tried to setgid %s but no such group. Exiting\n",
458 SILC_LOG_DEBUG(("Changing to user nobody"));
459 if(setuid(pw->pw_uid)==0) {
460 SILC_LOG_DEBUG(("Setuid to %s", user));
462 SILC_LOG_DEBUG(("Setuid to %s failed", user));
463 fprintf(stderr, "Tried to setuid %s but no such user. Exiting\n",
469 /* Fork server to background, making it a daemon */
471 SILC_LOG_DEBUG(("Server started as user"));
472 SILC_LOG_DEBUG(("Forking SILC server to background"));
479 /* Stops the SILC server. This function is used to shutdown the server.
480 This is usually called after the scheduler has returned. After stopping
481 the server one should call silc_server_free. */
483 void silc_server_stop(SilcServer server)
485 SILC_LOG_DEBUG(("Stopping server"));
487 /* Stop the scheduler, although it might be already stopped. This
488 doesn't hurt anyone. This removes all the tasks and task queues,
490 silc_schedule_stop();
491 silc_schedule_uninit();
493 silc_server_protocols_unregister();
495 SILC_LOG_DEBUG(("Server stopped"));
498 /* The heart of the server. This runs the scheduler thus runs the server.
499 When this returns the server has been stopped and the program will
502 void silc_server_run(SilcServer server)
504 SILC_LOG_DEBUG(("Running server"));
506 /* Start the scheduler, the heart of the SILC server. When this returns
507 the program will be terminated. */
511 /* Timeout callback that will be called to retry connecting to remote
512 router. This is used by both normal and router server. This will wait
513 before retrying the connecting. The timeout is generated by exponential
514 backoff algorithm. */
516 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
518 SilcServerConnection sconn = (SilcServerConnection)context;
519 SilcServer server = sconn->server;
521 SILC_LOG_INFO(("Retrying connecting to a router"));
523 /* Calculate next timeout */
524 if (sconn->retry_count >= 1) {
525 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
526 if (sconn->retry_timeout > SILC_SERVER_RETRY_INTERVAL_MAX)
527 sconn->retry_timeout = SILC_SERVER_RETRY_INTERVAL_MAX;
529 sconn->retry_timeout = server->params->retry_interval_min;
531 sconn->retry_count++;
532 sconn->retry_timeout = sconn->retry_timeout +
533 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
535 /* If we've reached max retry count, give up. */
536 if (sconn->retry_count > server->params->retry_count &&
537 server->params->retry_keep_trying == FALSE) {
538 SILC_LOG_ERROR(("Could not connect to router, giving up"));
542 /* Wait one before retrying */
543 silc_task_register(server->timeout_queue, fd, silc_server_connect_router,
544 context, sconn->retry_timeout,
545 server->params->retry_interval_min_usec,
546 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
549 /* Generic routine to use connect to a router. */
551 SILC_TASK_CALLBACK(silc_server_connect_router)
553 SilcServerConnection sconn = (SilcServerConnection)context;
554 SilcServer server = sconn->server;
555 SilcSocketConnection newsocket;
556 SilcProtocol protocol;
557 SilcServerKEInternalContext *proto_ctx;
560 /* Connect to remote host */
561 sock = silc_net_create_connection(sconn->remote_port,
564 SILC_LOG_ERROR(("Could not connect to router"));
565 silc_task_register(server->timeout_queue, fd,
566 silc_server_connect_to_router_retry,
567 context, 0, 1, SILC_TASK_TIMEOUT,
568 SILC_TASK_PRI_NORMAL);
572 /* Set socket options */
573 silc_net_set_socket_nonblock(sock);
574 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
576 /* Create socket connection for the connection. Even though we
577 know that we are connecting to a router we will mark the socket
578 to be unknown connection until we have executed authentication
580 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
581 server->sockets[sock] = newsocket;
582 newsocket->hostname = strdup(sconn->remote_host);
583 newsocket->ip = strdup(sconn->remote_host);
584 newsocket->port = sconn->remote_port;
585 sconn->sock = newsocket;
587 /* Allocate internal protocol context. This is sent as context
589 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
590 proto_ctx->server = (void *)server;
591 proto_ctx->context = (void *)sconn;
592 proto_ctx->sock = newsocket;
593 proto_ctx->rng = server->rng;
594 proto_ctx->responder = FALSE;
596 /* Perform key exchange protocol. silc_server_connect_to_router_second
597 will be called after the protocol is finished. */
598 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
599 &protocol, proto_ctx,
600 silc_server_connect_to_router_second);
601 newsocket->protocol = protocol;
603 /* Register a timeout task that will be executed if the protocol
604 is not executed within set limit. */
605 proto_ctx->timeout_task =
606 silc_task_register(server->timeout_queue, sock,
607 silc_server_timeout_remote,
608 server, server->params->protocol_timeout,
609 server->params->protocol_timeout_usec,
613 /* Register the connection for network input and output. This sets
614 that scheduler will listen for incoming packets for this connection
615 and sets that outgoing packets may be sent to this connection as
616 well. However, this doesn't set the scheduler for outgoing traffic,
617 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
618 later when outgoing data is available. */
619 context = (void *)server;
620 SILC_REGISTER_CONNECTION_FOR_IO(sock);
622 /* Run the protocol */
623 protocol->execute(server->timeout_queue, 0, protocol, sock, 0, 0);
626 /* This function connects to our primary router or if we are a router this
627 establishes all our primary routes. This is called at the start of the
628 server to do authentication and key exchange with our router - called
631 SILC_TASK_CALLBACK(silc_server_connect_to_router)
633 SilcServer server = (SilcServer)context;
634 SilcServerConnection sconn;
636 SILC_LOG_DEBUG(("Connecting to router(s)"));
638 /* If we are normal SILC server we need to connect to our cell's
640 if (server->server_type == SILC_SERVER) {
641 SILC_LOG_DEBUG(("We are normal server"));
643 /* Create connection to the router, if configured. */
644 if (server->config->routers) {
646 /* Allocate connection object for hold connection specific stuff. */
647 sconn = silc_calloc(1, sizeof(*sconn));
648 sconn->server = server;
649 sconn->remote_host = strdup(server->config->routers->host);
650 sconn->remote_port = server->config->routers->port;
652 silc_task_register(server->timeout_queue, fd,
653 silc_server_connect_router,
654 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
655 SILC_TASK_PRI_NORMAL);
660 /* If we are a SILC router we need to establish all of our primary
662 if (server->server_type == SILC_ROUTER) {
663 SilcServerConfigSectionServerConnection *ptr;
665 SILC_LOG_DEBUG(("We are router"));
667 /* Create the connections to all our routes */
668 ptr = server->config->routers;
671 SILC_LOG_DEBUG(("Router connection [%s] %s:%d",
672 ptr->initiator ? "Initiator" : "Responder",
673 ptr->host, ptr->port));
675 if (ptr->initiator) {
676 /* Allocate connection object for hold connection specific stuff. */
677 sconn = silc_calloc(1, sizeof(*sconn));
678 sconn->server = server;
679 sconn->remote_host = strdup(ptr->host);
680 sconn->remote_port = ptr->port;
682 silc_task_register(server->timeout_queue, fd,
683 silc_server_connect_router,
684 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
685 SILC_TASK_PRI_NORMAL);
695 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
697 /* There wasn't a configured router, we will continue but we don't
698 have a connection to outside world. We will be standalone server. */
699 server->standalone = TRUE;
702 /* Second part of connecting to router(s). Key exchange protocol has been
703 executed and now we will execute authentication protocol. */
705 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
707 SilcProtocol protocol = (SilcProtocol)context;
708 SilcServerKEInternalContext *ctx =
709 (SilcServerKEInternalContext *)protocol->context;
710 SilcServer server = (SilcServer)ctx->server;
711 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
712 SilcSocketConnection sock = NULL;
713 SilcServerConnAuthInternalContext *proto_ctx;
714 SilcServerConfigSectionServerConnection *conn = NULL;
716 SILC_LOG_DEBUG(("Start"));
718 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
719 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
720 /* Error occured during protocol */
721 silc_protocol_free(protocol);
722 silc_ske_free_key_material(ctx->keymat);
724 silc_packet_context_free(ctx->packet);
726 silc_ske_free(ctx->ske);
728 silc_free(ctx->dest_id);
730 silc_task_unregister_by_callback(server->timeout_queue,
731 silc_server_failure_callback);
732 silc_server_disconnect_remote(server, sock, "Server closed connection: "
733 "Key exchange failed");
737 /* We now have the key material as the result of the key exchange
738 protocol. Take the key material into use. Free the raw key material
739 as soon as we've set them into use. */
740 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
741 ctx->ske->prop->cipher,
742 ctx->ske->prop->pkcs,
743 ctx->ske->prop->hash,
744 ctx->ske->prop->hmac,
746 silc_protocol_free(protocol);
747 silc_ske_free_key_material(ctx->keymat);
749 silc_packet_context_free(ctx->packet);
751 silc_ske_free(ctx->ske);
753 silc_free(ctx->dest_id);
755 silc_task_unregister_by_callback(server->timeout_queue,
756 silc_server_failure_callback);
757 silc_server_disconnect_remote(server, sock, "Server closed connection: "
758 "Key exchange failed");
761 silc_ske_free_key_material(ctx->keymat);
763 /* Allocate internal context for the authentication protocol. This
764 is sent as context for the protocol. */
765 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
766 proto_ctx->server = (void *)server;
767 proto_ctx->context = (void *)sconn;
768 proto_ctx->sock = sock = server->sockets[fd];
769 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
770 proto_ctx->dest_id_type = ctx->dest_id_type;
771 proto_ctx->dest_id = ctx->dest_id;
773 /* Resolve the authentication method used in this connection. Check if
774 we find a match from user configured connections */
775 conn = silc_server_config_find_router_conn(server->config,
779 /* Match found. Use the configured authentication method */
780 proto_ctx->auth_meth = conn->auth_meth;
781 if (conn->auth_data) {
782 proto_ctx->auth_data = strdup(conn->auth_data);
783 proto_ctx->auth_data_len = strlen(conn->auth_data);
786 SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
787 sock->hostname, sock->ip, sock->port));
788 silc_protocol_free(protocol);
790 silc_packet_context_free(ctx->packet);
792 silc_ske_free(ctx->ske);
794 silc_free(ctx->dest_id);
796 silc_task_unregister_by_callback(server->timeout_queue,
797 silc_server_failure_callback);
798 silc_server_disconnect_remote(server, sock, "Server closed connection: "
799 "Key exchange failed");
803 /* Free old protocol as it is finished now */
804 silc_protocol_free(protocol);
806 silc_packet_context_free(ctx->packet);
808 sock->protocol = NULL;
810 /* Allocate the authentication protocol. This is allocated here
811 but we won't start it yet. We will be receiving party of this
812 protocol thus we will wait that connecting party will make
814 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
815 &sock->protocol, proto_ctx,
816 silc_server_connect_to_router_final);
818 /* Register timeout task. If the protocol is not executed inside
819 this timelimit the connection will be terminated. Currently
820 this is 15 seconds and is hard coded limit (XXX). */
821 proto_ctx->timeout_task =
822 silc_task_register(server->timeout_queue, sock->sock,
823 silc_server_timeout_remote,
824 (void *)server, 15, 0,
828 /* Run the protocol */
829 sock->protocol->execute(server->timeout_queue, 0,
830 sock->protocol, sock->sock, 0, 0);
833 /* Finalizes the connection to router. Registers a server task to the
834 queue so that we can accept new connections. */
836 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
838 SilcProtocol protocol = (SilcProtocol)context;
839 SilcServerConnAuthInternalContext *ctx =
840 (SilcServerConnAuthInternalContext *)protocol->context;
841 SilcServer server = (SilcServer)ctx->server;
842 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
843 SilcSocketConnection sock = ctx->sock;
844 SilcServerEntry id_entry;
846 SilcServerHBContext hb_context;
847 unsigned char *id_string;
849 SILC_LOG_DEBUG(("Start"));
851 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
852 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
853 /* Error occured during protocol */
855 silc_free(ctx->dest_id);
856 silc_server_disconnect_remote(server, sock, "Server closed connection: "
857 "Authentication failed");
861 /* Add a task to the queue. This task receives new connections to the
862 server. This task remains on the queue until the end of the program. */
863 if (!server->listenning) {
864 silc_task_register(server->io_queue, server->sock,
865 silc_server_accept_new_connection,
866 (void *)server, 0, 0,
868 SILC_TASK_PRI_NORMAL);
869 server->listenning = TRUE;
872 /* Send NEW_SERVER packet to the router. We will become registered
873 to the SILC network after sending this packet. */
874 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
875 packet = silc_buffer_alloc(2 + 2 + SILC_ID_SERVER_LEN +
876 strlen(server->server_name));
877 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
878 silc_buffer_format(packet,
879 SILC_STR_UI_SHORT(SILC_ID_SERVER_LEN),
880 SILC_STR_UI_XNSTRING(id_string, SILC_ID_SERVER_LEN),
881 SILC_STR_UI_SHORT(strlen(server->server_name)),
882 SILC_STR_UI_XNSTRING(server->server_name,
883 strlen(server->server_name)),
886 /* Send the packet */
887 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
888 packet->data, packet->len, TRUE);
889 silc_buffer_free(packet);
890 silc_free(id_string);
892 SILC_LOG_DEBUG(("Connected to router %s", sock->hostname));
894 /* Add the connected router to local server list */
895 server->standalone = FALSE;
896 id_entry = silc_idlist_add_server(server->local_list, sock->hostname,
897 SILC_ROUTER, ctx->dest_id, NULL, sock);
900 silc_free(ctx->dest_id);
901 silc_server_disconnect_remote(server, sock, "Server closed connection: "
902 "Authentication failed");
906 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
907 silc_free(sock->user_data);
908 sock->user_data = (void *)id_entry;
909 sock->type = SILC_SOCKET_TYPE_ROUTER;
910 server->id_entry->router = id_entry;
911 server->router = id_entry;
912 server->router->data.registered = TRUE;
914 /* Perform keepalive. The `hb_context' will be freed automatically
915 when finally calling the silc_socket_free function. XXX hardcoded
917 hb_context = silc_calloc(1, sizeof(*hb_context));
918 hb_context->server = server;
919 silc_socket_set_heartbeat(sock, 600, hb_context,
920 silc_server_perform_heartbeat,
921 server->timeout_queue);
923 /* If we are router then announce our possible servers. */
924 if (server->server_type == SILC_ROUTER)
925 silc_server_announce_servers(server);
927 /* Announce our clients and channels to the router */
928 silc_server_announce_clients(server);
929 silc_server_announce_channels(server);
932 /* Free the temporary connection data context */
934 silc_free(sconn->remote_host);
938 /* Free the protocol object */
939 silc_protocol_free(protocol);
941 silc_packet_context_free(ctx->packet);
943 silc_ske_free(ctx->ske);
945 sock->protocol = NULL;
948 /* Accepts new connections to the server. Accepting new connections are
949 done in three parts to make it async. */
951 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
953 SilcServer server = (SilcServer)context;
954 SilcSocketConnection newsocket;
955 SilcServerKEInternalContext *proto_ctx;
958 SILC_LOG_DEBUG(("Accepting new connection"));
960 server->stat.conn_attempts++;
962 sock = silc_net_accept_connection(server->sock);
964 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
965 server->stat.conn_failures++;
969 /* Check max connections */
970 if (sock > SILC_SERVER_MAX_CONNECTIONS) {
971 SILC_LOG_ERROR(("Refusing connection, server is full"));
972 server->stat.conn_failures++;
976 /* Set socket options */
977 silc_net_set_socket_nonblock(sock);
978 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
980 /* We don't create a ID yet, since we don't know what type of connection
981 this is yet. But, we do add the connection to the socket table. */
982 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
983 server->sockets[sock] = newsocket;
985 /* XXX This MUST be done async as this will block the entire server
986 process. Either we have to do our own resolver stuff or in the future
987 we can use threads. */
988 /* Perform name and address lookups for the remote host. */
989 silc_net_check_host_by_sock(sock, &newsocket->hostname, &newsocket->ip);
990 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
992 SILC_LOG_ERROR(("IP/DNS lookup failed"));
993 server->stat.conn_failures++;
996 if (!newsocket->hostname)
997 newsocket->hostname = strdup(newsocket->ip);
998 newsocket->port = silc_net_get_remote_port(sock);
1000 SILC_LOG_INFO(("Incoming connection from %s (%s)", newsocket->hostname,
1003 /* Allocate internal context for key exchange protocol. This is
1004 sent as context for the protocol. */
1005 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1006 proto_ctx->server = context;
1007 proto_ctx->sock = newsocket;
1008 proto_ctx->rng = server->rng;
1009 proto_ctx->responder = TRUE;
1011 /* Prepare the connection for key exchange protocol. We allocate the
1012 protocol but will not start it yet. The connector will be the
1013 initiator of the protocol thus we will wait for initiation from
1014 there before we start the protocol. */
1015 server->stat.auth_attempts++;
1016 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1017 &newsocket->protocol, proto_ctx,
1018 silc_server_accept_new_connection_second);
1020 /* Register a timeout task that will be executed if the connector
1021 will not start the key exchange protocol within 60 seconds. For
1022 now, this is a hard coded limit. After 60 secs the connection will
1023 be closed if the key exchange protocol has not been started. */
1024 proto_ctx->timeout_task =
1025 silc_task_register(server->timeout_queue, newsocket->sock,
1026 silc_server_timeout_remote,
1031 /* Register the connection for network input and output. This sets
1032 that scheduler will listen for incoming packets for this connection
1033 and sets that outgoing packets may be sent to this connection as well.
1034 However, this doesn't set the scheduler for outgoing traffic, it
1035 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1036 later when outgoing data is available. */
1037 SILC_REGISTER_CONNECTION_FOR_IO(sock);
1040 /* Second part of accepting new connection. Key exchange protocol has been
1041 performed and now it is time to do little connection authentication
1042 protocol to figure out whether this connection is client or server
1043 and whether it has right to access this server (especially server
1044 connections needs to be authenticated). */
1046 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1048 SilcProtocol protocol = (SilcProtocol)context;
1049 SilcServerKEInternalContext *ctx =
1050 (SilcServerKEInternalContext *)protocol->context;
1051 SilcServer server = (SilcServer)ctx->server;
1052 SilcSocketConnection sock = NULL;
1053 SilcServerConnAuthInternalContext *proto_ctx;
1055 SILC_LOG_DEBUG(("Start"));
1057 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1058 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1059 /* Error occured during protocol */
1060 silc_protocol_free(protocol);
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++;
1077 /* We now have the key material as the result of the key exchange
1078 protocol. Take the key material into use. Free the raw key material
1079 as soon as we've set them into use. */
1080 if (!silc_server_protocol_ke_set_keys(ctx->ske, ctx->sock, ctx->keymat,
1081 ctx->ske->prop->cipher,
1082 ctx->ske->prop->pkcs,
1083 ctx->ske->prop->hash,
1084 ctx->ske->prop->hmac,
1086 silc_protocol_free(protocol);
1087 silc_ske_free_key_material(ctx->keymat);
1089 silc_packet_context_free(ctx->packet);
1091 silc_ske_free(ctx->ske);
1093 silc_free(ctx->dest_id);
1095 silc_task_unregister_by_callback(server->timeout_queue,
1096 silc_server_failure_callback);
1097 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1098 "Key exchange failed");
1099 server->stat.auth_failures++;
1102 silc_ske_free_key_material(ctx->keymat);
1104 /* Allocate internal context for the authentication protocol. This
1105 is sent as context for the protocol. */
1106 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1107 proto_ctx->server = (void *)server;
1108 proto_ctx->sock = sock = server->sockets[fd];
1109 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
1110 proto_ctx->responder = TRUE;
1111 proto_ctx->dest_id_type = ctx->dest_id_type;
1112 proto_ctx->dest_id = ctx->dest_id;
1114 /* Free old protocol as it is finished now */
1115 silc_protocol_free(protocol);
1117 silc_packet_context_free(ctx->packet);
1119 sock->protocol = NULL;
1121 /* Allocate the authentication protocol. This is allocated here
1122 but we won't start it yet. We will be receiving party of this
1123 protocol thus we will wait that connecting party will make
1124 their first move. */
1125 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1126 &sock->protocol, proto_ctx,
1127 silc_server_accept_new_connection_final);
1129 /* Register timeout task. If the protocol is not executed inside
1130 this timelimit the connection will be terminated. Currently
1131 this is 60 seconds and is hard coded limit (XXX). */
1132 proto_ctx->timeout_task =
1133 silc_task_register(server->timeout_queue, sock->sock,
1134 silc_server_timeout_remote,
1135 (void *)server, 60, 0,
1140 /* Final part of accepting new connection. The connection has now
1141 been authenticated and keys has been exchanged. We also know whether
1142 this is client or server connection. */
1144 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1146 SilcProtocol protocol = (SilcProtocol)context;
1147 SilcServerConnAuthInternalContext *ctx =
1148 (SilcServerConnAuthInternalContext *)protocol->context;
1149 SilcServer server = (SilcServer)ctx->server;
1150 SilcSocketConnection sock = ctx->sock;
1151 SilcServerHBContext hb_context;
1152 void *id_entry = NULL;
1154 SILC_LOG_DEBUG(("Start"));
1156 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1157 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1158 /* Error occured during protocol */
1159 silc_protocol_free(protocol);
1161 silc_packet_context_free(ctx->packet);
1163 silc_ske_free(ctx->ske);
1165 silc_free(ctx->dest_id);
1168 sock->protocol = NULL;
1169 silc_task_unregister_by_callback(server->timeout_queue,
1170 silc_server_failure_callback);
1171 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1172 "Authentication failed");
1173 server->stat.auth_failures++;
1177 sock->type = ctx->conn_type;
1178 switch(sock->type) {
1179 case SILC_SOCKET_TYPE_CLIENT:
1181 SilcClientEntry client;
1183 SILC_LOG_DEBUG(("Remote host is client"));
1184 SILC_LOG_INFO(("Connection from %s (%s) is client", sock->hostname,
1187 /* Add the client to the client ID cache. The nickname and Client ID
1188 and other information is created after we have received NEW_CLIENT
1189 packet from client. */
1190 client = silc_idlist_add_client(server->local_list,
1191 NULL, 0, NULL, NULL, NULL, NULL, sock);
1193 SILC_LOG_ERROR(("Could not add new client to cache"));
1194 silc_free(sock->user_data);
1199 server->stat.my_clients++;
1200 server->stat.clients++;
1201 if (server->server_type == SILC_ROUTER)
1202 server->stat.cell_clients++;
1204 id_entry = (void *)client;
1207 case SILC_SOCKET_TYPE_SERVER:
1208 case SILC_SOCKET_TYPE_ROUTER:
1210 SilcServerEntry new_server;
1212 SILC_LOG_DEBUG(("Remote host is %s",
1213 sock->type == SILC_SOCKET_TYPE_SERVER ?
1214 "server" : "router"));
1215 SILC_LOG_INFO(("Connection from %s (%s) is %s", sock->hostname,
1216 sock->ip, sock->type == SILC_SOCKET_TYPE_SERVER ?
1217 "server" : "router"));
1219 /* Add the server into server cache. The server name and Server ID
1220 is updated after we have received NEW_SERVER packet from the
1221 server. We mark ourselves as router for this server if we really
1224 silc_idlist_add_server(server->local_list, NULL,
1225 sock->type == SILC_SOCKET_TYPE_SERVER ?
1226 SILC_SERVER : SILC_ROUTER, NULL,
1227 sock->type == SILC_SOCKET_TYPE_SERVER ?
1228 server->id_entry : NULL, sock);
1230 SILC_LOG_ERROR(("Could not add new server to cache"));
1231 silc_free(sock->user_data);
1236 if (sock->type == SILC_SOCKET_TYPE_SERVER)
1237 server->stat.my_servers++;
1239 server->stat.my_routers++;
1240 server->stat.servers++;
1242 id_entry = (void *)new_server;
1244 /* There is connection to other server now, if it is router then
1245 we will have connection to outside world. If we are router but
1246 normal server connected to us then we will remain standalone,
1247 if we are standlone. */
1248 if (server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER) {
1249 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1250 server->standalone = FALSE;
1251 if (!server->id_entry->router) {
1252 server->id_entry->router = id_entry;
1253 server->router = id_entry;
1262 /* Add the common data structure to the ID entry. */
1264 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1266 /* Add to sockets internal pointer for fast referencing */
1267 silc_free(sock->user_data);
1268 sock->user_data = id_entry;
1270 /* Connection has been fully established now. Everything is ok. */
1271 SILC_LOG_DEBUG(("New connection authenticated"));
1273 /* Perform keepalive. The `hb_context' will be freed automatically
1274 when finally calling the silc_socket_free function. XXX hardcoded
1276 hb_context = silc_calloc(1, sizeof(*hb_context));
1277 hb_context->server = server;
1278 silc_socket_set_heartbeat(sock, 600, hb_context,
1279 silc_server_perform_heartbeat,
1280 server->timeout_queue);
1282 silc_task_unregister_by_callback(server->timeout_queue,
1283 silc_server_failure_callback);
1284 silc_protocol_free(protocol);
1286 silc_packet_context_free(ctx->packet);
1288 silc_ske_free(ctx->ske);
1290 silc_free(ctx->dest_id);
1292 sock->protocol = NULL;
1295 /* This function is used to read packets from network and send packets to
1296 network. This is usually a generic task. */
1298 SILC_TASK_CALLBACK(silc_server_packet_process)
1300 SilcServer server = (SilcServer)context;
1301 SilcSocketConnection sock = server->sockets[fd];
1302 SilcIDListData idata;
1303 SilcCipher cipher = NULL;
1304 SilcHmac hmac = NULL;
1310 SILC_LOG_DEBUG(("Processing packet"));
1312 /* Packet sending */
1314 if (type == SILC_TASK_WRITE) {
1315 /* Do not send data to disconnected connection */
1316 if (SILC_IS_DISCONNECTED(sock))
1319 server->stat.packets_sent++;
1321 if (sock->outbuf->data - sock->outbuf->head)
1322 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1324 ret = silc_server_packet_send_real(server, sock, TRUE);
1326 /* If returned -2 could not write to connection now, will do
1334 /* The packet has been sent and now it is time to set the connection
1335 back to only for input. When there is again some outgoing data
1336 available for this connection it will be set for output as well.
1337 This call clears the output setting and sets it only for input. */
1338 SILC_SET_CONNECTION_FOR_INPUT(fd);
1339 SILC_UNSET_OUTBUF_PENDING(sock);
1341 silc_buffer_clear(sock->outbuf);
1345 /* Packet receiving */
1347 /* Read some data from connection */
1348 ret = silc_packet_receive(sock);
1354 SILC_LOG_DEBUG(("Read EOF"));
1356 /* If connection is disconnecting already we will finally
1357 close the connection */
1358 if (SILC_IS_DISCONNECTING(sock)) {
1359 if (sock->user_data)
1360 silc_server_free_sock_user_data(server, sock);
1361 silc_server_close_connection(server, sock);
1365 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1366 SILC_SET_DISCONNECTING(sock);
1368 /* If the closed connection was our primary router connection the
1369 start re-connecting phase. */
1370 if (!server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER &&
1371 sock == server->router->connection)
1372 silc_task_register(server->timeout_queue, 0,
1373 silc_server_connect_to_router,
1376 SILC_TASK_PRI_NORMAL);
1378 if (sock->user_data)
1379 silc_server_free_sock_user_data(server, sock);
1380 silc_server_close_connection(server, sock);
1384 /* If connection is disconnecting or disconnected we will ignore
1386 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1387 SILC_LOG_DEBUG(("Ignoring read data from disonnected connection"));
1391 server->stat.packets_received++;
1393 /* Get keys and stuff from ID entry */
1394 idata = (SilcIDListData)sock->user_data;
1396 idata->last_receive = time(NULL);
1397 cipher = idata->receive_key;
1401 /* Process the packet. This will call the parser that will then
1402 decrypt and parse the packet. */
1403 silc_packet_receive_process(sock, cipher, hmac, silc_server_packet_parse,
1407 /* Callback function that the silc_packet_decrypt will call to make the
1408 decision whether the packet is normal or special packet. We will
1409 return TRUE if it is normal and FALSE if it is special */
1411 static int silc_server_packet_decrypt_check(SilcPacketType packet_type,
1413 SilcPacketContext *packet,
1416 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1417 SilcServer server = (SilcServer)parse_ctx->context;
1419 /* Packet is normal packet, if:
1421 1) packet is private message packet and does not have private key set
1422 2) is other packet than channel message packet
1423 3) is channel message packet and remote is router and we are router
1425 all other packets are special packets
1428 if (packet_type == SILC_PACKET_PRIVATE_MESSAGE &&
1429 (buffer->data[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
1432 if (packet_type != SILC_PACKET_CHANNEL_MESSAGE ||
1433 (packet_type == SILC_PACKET_CHANNEL_MESSAGE &&
1434 parse_ctx->sock->type == SILC_SOCKET_TYPE_ROUTER &&
1435 server->server_type == SILC_ROUTER))
1441 /* Parses whole packet, received earlier. */
1443 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1445 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1446 SilcServer server = (SilcServer)parse_ctx->context;
1447 SilcSocketConnection sock = parse_ctx->sock;
1448 SilcPacketContext *packet = parse_ctx->packet;
1451 SILC_LOG_DEBUG(("Start"));
1453 /* Decrypt the received packet */
1454 ret = silc_packet_decrypt(parse_ctx->cipher, parse_ctx->hmac,
1455 packet->buffer, packet,
1456 silc_server_packet_decrypt_check, parse_ctx);
1461 /* Parse the packet. Packet type is returned. */
1462 ret = silc_packet_parse(packet);
1464 /* Parse the packet header in special way as this is "special"
1466 ret = silc_packet_parse_special(packet);
1469 if (ret == SILC_PACKET_NONE)
1472 /* Check that the the current client ID is same as in the client's packet. */
1473 if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
1474 SilcClientEntry client = (SilcClientEntry)sock->user_data;
1475 if (client && client->id) {
1476 void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
1477 packet->src_id_type);
1478 if (SILC_ID_CLIENT_COMPARE(client->id, id)) {
1486 if (server->server_type == SILC_ROUTER) {
1487 /* Route the packet if it is not destined to us. Other ID types but
1488 server are handled separately after processing them. */
1489 if (packet->dst_id_type == SILC_ID_SERVER &&
1490 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1491 SILC_ID_SERVER_COMPARE(packet->dst_id, server->id_string)) {
1493 /* Route the packet to fastest route for the destination ID */
1494 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
1495 packet->dst_id_type);
1498 silc_server_packet_route(server,
1499 silc_server_route_get(server, id,
1500 packet->dst_id_type),
1506 /* Broadcast packet if it is marked as broadcast packet and it is
1507 originated from router and we are router. */
1508 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1509 packet->flags & SILC_PACKET_FLAG_BROADCAST) {
1510 silc_server_packet_broadcast(server, server->router->connection, packet);
1514 /* Parse the incoming packet type */
1515 silc_server_packet_parse_type(server, sock, packet);
1518 /* silc_buffer_clear(sock->inbuf); */
1519 silc_packet_context_free(packet);
1520 silc_free(parse_ctx);
1523 /* Parser callback called by silc_packet_receive_process. This merely
1524 registers timeout that will handle the actual parsing when appropriate. */
1526 void silc_server_packet_parse(SilcPacketParserContext *parser_context)
1528 SilcServer server = (SilcServer)parser_context->context;
1529 SilcSocketConnection sock = parser_context->sock;
1531 switch (sock->type) {
1532 case SILC_SOCKET_TYPE_CLIENT:
1533 case SILC_SOCKET_TYPE_UNKNOWN:
1534 /* Parse the packet with timeout */
1535 silc_task_register(server->timeout_queue, sock->sock,
1536 silc_server_packet_parse_real,
1537 (void *)parser_context, 0, 100000,
1539 SILC_TASK_PRI_NORMAL);
1541 case SILC_SOCKET_TYPE_SERVER:
1542 case SILC_SOCKET_TYPE_ROUTER:
1543 /* Packets from servers are parsed as soon as possible */
1544 silc_task_register(server->timeout_queue, sock->sock,
1545 silc_server_packet_parse_real,
1546 (void *)parser_context, 0, 1,
1548 SILC_TASK_PRI_NORMAL);
1555 /* Parses the packet type and calls what ever routines the packet type
1556 requires. This is done for all incoming packets. */
1558 void silc_server_packet_parse_type(SilcServer server,
1559 SilcSocketConnection sock,
1560 SilcPacketContext *packet)
1562 SilcPacketType type = packet->type;
1564 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1566 /* Parse the packet type */
1568 case SILC_PACKET_DISCONNECT:
1569 SILC_LOG_DEBUG(("Disconnect packet"));
1570 if (packet->flags & SILC_PACKET_FLAG_LIST)
1574 case SILC_PACKET_SUCCESS:
1576 * Success received for something. For now we can have only
1577 * one protocol for connection executing at once hence this
1578 * success message is for whatever protocol is executing currently.
1580 SILC_LOG_DEBUG(("Success packet"));
1581 if (packet->flags & SILC_PACKET_FLAG_LIST)
1583 if (sock->protocol) {
1584 sock->protocol->execute(server->timeout_queue, 0,
1585 sock->protocol, sock->sock, 0, 0);
1589 case SILC_PACKET_FAILURE:
1591 * Failure received for something. For now we can have only
1592 * one protocol for connection executing at once hence this
1593 * failure message is for whatever protocol is executing currently.
1595 SILC_LOG_DEBUG(("Failure packet"));
1596 if (packet->flags & SILC_PACKET_FLAG_LIST)
1598 if (sock->protocol) {
1599 SilcServerFailureContext f;
1600 f = silc_calloc(1, sizeof(*f));
1604 /* We will wait 5 seconds to process this failure packet */
1605 silc_task_register(server->timeout_queue, sock->sock,
1606 silc_server_failure_callback, (void *)f, 5, 0,
1607 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1611 case SILC_PACKET_REJECT:
1612 SILC_LOG_DEBUG(("Reject packet"));
1613 if (packet->flags & SILC_PACKET_FLAG_LIST)
1618 case SILC_PACKET_NOTIFY:
1620 * Received notify packet. Server can receive notify packets from
1621 * router. Server then relays the notify messages to clients if needed.
1623 SILC_LOG_DEBUG(("Notify packet"));
1624 if (packet->flags & SILC_PACKET_FLAG_LIST)
1625 silc_server_notify_list(server, sock, packet);
1627 silc_server_notify(server, sock, packet);
1633 case SILC_PACKET_CHANNEL_MESSAGE:
1635 * Received channel message. Channel messages are special packets
1636 * (although probably most common ones) thus they are handled
1639 SILC_LOG_DEBUG(("Channel Message packet"));
1640 if (packet->flags & SILC_PACKET_FLAG_LIST)
1642 silc_server_channel_message(server, sock, packet);
1645 case SILC_PACKET_CHANNEL_KEY:
1647 * Received key for channel. As channels are created by the router
1648 * the keys are as well. We will distribute the key to all of our
1649 * locally connected clients on the particular channel. Router
1650 * never receives this channel and thus is ignored.
1652 SILC_LOG_DEBUG(("Channel Key packet"));
1653 if (packet->flags & SILC_PACKET_FLAG_LIST)
1655 silc_server_channel_key(server, sock, packet);
1661 case SILC_PACKET_COMMAND:
1663 * Recived command. Processes the command request and allocates the
1664 * command context and calls the command.
1666 SILC_LOG_DEBUG(("Command packet"));
1667 if (packet->flags & SILC_PACKET_FLAG_LIST)
1669 silc_server_command_process(server, sock, packet);
1672 case SILC_PACKET_COMMAND_REPLY:
1674 * Received command reply packet. Received command reply to command. It
1675 * may be reply to command sent by us or reply to command sent by client
1676 * that we've routed further.
1678 SILC_LOG_DEBUG(("Command Reply packet"));
1679 if (packet->flags & SILC_PACKET_FLAG_LIST)
1681 silc_server_command_reply(server, sock, packet);
1685 * Private Message packets
1687 case SILC_PACKET_PRIVATE_MESSAGE:
1689 * Received private message packet. The packet is coming from either
1692 SILC_LOG_DEBUG(("Private Message packet"));
1693 if (packet->flags & SILC_PACKET_FLAG_LIST)
1695 silc_server_private_message(server, sock, packet);
1698 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1700 * Private message key packet.
1702 if (packet->flags & SILC_PACKET_FLAG_LIST)
1704 silc_server_private_message_key(server, sock, packet);
1708 * Key Exchange protocol packets
1710 case SILC_PACKET_KEY_EXCHANGE:
1711 SILC_LOG_DEBUG(("KE packet"));
1712 if (packet->flags & SILC_PACKET_FLAG_LIST)
1715 if (sock->protocol && sock->protocol->protocol &&
1716 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1718 SilcServerKEInternalContext *proto_ctx =
1719 (SilcServerKEInternalContext *)sock->protocol->context;
1721 proto_ctx->packet = silc_packet_context_dup(packet);
1723 /* Let the protocol handle the packet */
1724 sock->protocol->execute(server->timeout_queue, 0,
1725 sock->protocol, sock->sock, 0, 100000);
1727 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1728 "protocol active, packet dropped."));
1730 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1734 case SILC_PACKET_KEY_EXCHANGE_1:
1735 SILC_LOG_DEBUG(("KE 1 packet"));
1736 if (packet->flags & SILC_PACKET_FLAG_LIST)
1739 if (sock->protocol && sock->protocol->protocol &&
1740 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1742 SilcServerKEInternalContext *proto_ctx =
1743 (SilcServerKEInternalContext *)sock->protocol->context;
1745 if (proto_ctx->packet)
1746 silc_packet_context_free(proto_ctx->packet);
1748 proto_ctx->packet = silc_packet_context_dup(packet);
1749 proto_ctx->dest_id_type = packet->src_id_type;
1750 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1751 packet->src_id_type);
1752 if (!proto_ctx->dest_id)
1755 /* Let the protocol handle the packet */
1756 sock->protocol->execute(server->timeout_queue, 0,
1757 sock->protocol, sock->sock,
1760 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1761 "protocol active, packet dropped."));
1765 case SILC_PACKET_KEY_EXCHANGE_2:
1766 SILC_LOG_DEBUG(("KE 2 packet"));
1767 if (packet->flags & SILC_PACKET_FLAG_LIST)
1770 if (sock->protocol && sock->protocol->protocol &&
1771 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1773 SilcServerKEInternalContext *proto_ctx =
1774 (SilcServerKEInternalContext *)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);
1780 proto_ctx->dest_id_type = packet->src_id_type;
1781 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1782 packet->src_id_type);
1783 if (!proto_ctx->dest_id)
1786 /* Let the protocol handle the packet */
1787 sock->protocol->execute(server->timeout_queue, 0,
1788 sock->protocol, sock->sock,
1791 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
1792 "protocol active, packet dropped."));
1796 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
1798 * Connection authentication request packet. When we receive this packet
1799 * we will send to the other end information about our mandatory
1800 * authentication method for the connection. This packet maybe received
1803 SILC_LOG_DEBUG(("Connection authentication request packet"));
1804 if (packet->flags & SILC_PACKET_FLAG_LIST)
1806 silc_server_connection_auth_request(server, sock, packet);
1810 * Connection Authentication protocol packets
1812 case SILC_PACKET_CONNECTION_AUTH:
1813 /* Start of the authentication protocol. We receive here the
1814 authentication data and will verify it. */
1815 SILC_LOG_DEBUG(("Connection auth packet"));
1816 if (packet->flags & SILC_PACKET_FLAG_LIST)
1819 if (sock->protocol && sock->protocol->protocol->type
1820 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
1822 SilcServerConnAuthInternalContext *proto_ctx =
1823 (SilcServerConnAuthInternalContext *)sock->protocol->context;
1825 proto_ctx->packet = silc_packet_context_dup(packet);
1827 /* Let the protocol handle the packet */
1828 sock->protocol->execute(server->timeout_queue, 0,
1829 sock->protocol, sock->sock, 0, 0);
1831 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1832 "protocol active, packet dropped."));
1836 case SILC_PACKET_NEW_ID:
1838 * Received New ID packet. This includes some new ID that has been
1839 * created. It may be for client, server or channel. This is the way
1840 * to distribute information about new registered entities in the
1843 SILC_LOG_DEBUG(("New ID packet"));
1844 if (packet->flags & SILC_PACKET_FLAG_LIST)
1845 silc_server_new_id_list(server, sock, packet);
1847 silc_server_new_id(server, sock, packet);
1850 case SILC_PACKET_NEW_CLIENT:
1852 * Received new client packet. This includes client information that
1853 * we will use to create initial client ID. After creating new
1854 * ID we will send it to the client.
1856 SILC_LOG_DEBUG(("New Client packet"));
1857 if (packet->flags & SILC_PACKET_FLAG_LIST)
1859 silc_server_new_client(server, sock, packet);
1862 case SILC_PACKET_NEW_SERVER:
1864 * Received new server packet. This includes Server ID and some other
1865 * information that we may save. This is received after server has
1868 SILC_LOG_DEBUG(("New Server packet"));
1869 if (packet->flags & SILC_PACKET_FLAG_LIST)
1871 silc_server_new_server(server, sock, packet);
1874 case SILC_PACKET_NEW_CHANNEL:
1876 * Received new channel packet. Information about new channel in the
1877 * network are distributed using this packet.
1879 SILC_LOG_DEBUG(("New Channel packet"));
1880 if (packet->flags & SILC_PACKET_FLAG_LIST)
1881 silc_server_new_channel_list(server, sock, packet);
1883 silc_server_new_channel(server, sock, packet);
1886 case SILC_PACKET_HEARTBEAT:
1888 * Received heartbeat.
1890 SILC_LOG_DEBUG(("Heartbeat packet"));
1891 if (packet->flags & SILC_PACKET_FLAG_LIST)
1895 case SILC_PACKET_KEY_AGREEMENT:
1897 * Received heartbeat.
1899 SILC_LOG_DEBUG(("Key agreement packet"));
1900 if (packet->flags & SILC_PACKET_FLAG_LIST)
1902 silc_server_key_agreement(server, sock, packet);
1906 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
1912 /* Creates connection to a remote router. */
1914 void silc_server_create_connection(SilcServer server,
1915 char *remote_host, unsigned int port)
1917 SilcServerConnection sconn;
1919 /* Allocate connection object for hold connection specific stuff. */
1920 sconn = silc_calloc(1, sizeof(*sconn));
1921 sconn->server = server;
1922 sconn->remote_host = strdup(remote_host);
1923 sconn->remote_port = port;
1925 silc_task_register(server->timeout_queue, 0,
1926 silc_server_connect_router,
1927 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
1928 SILC_TASK_PRI_NORMAL);
1931 SILC_TASK_CALLBACK(silc_server_close_connection_final)
1933 silc_socket_free((SilcSocketConnection)context);
1936 /* Closes connection to socket connection */
1938 void silc_server_close_connection(SilcServer server,
1939 SilcSocketConnection sock)
1941 SILC_LOG_DEBUG(("Closing connection %d", sock->sock));
1943 /* We won't listen for this connection anymore */
1944 silc_schedule_unset_listen_fd(sock->sock);
1946 /* Unregister all tasks */
1947 silc_task_unregister_by_fd(server->io_queue, sock->sock);
1948 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
1950 /* Close the actual connection */
1951 silc_net_close_connection(sock->sock);
1952 server->sockets[sock->sock] = NULL;
1954 silc_task_register(server->timeout_queue, 0,
1955 silc_server_close_connection_final,
1956 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
1957 SILC_TASK_PRI_NORMAL);
1960 /* Sends disconnect message to remote connection and disconnects the
1963 void silc_server_disconnect_remote(SilcServer server,
1964 SilcSocketConnection sock,
1965 const char *fmt, ...)
1968 unsigned char buf[4096];
1973 memset(buf, 0, sizeof(buf));
1975 vsprintf(buf, fmt, ap);
1978 SILC_LOG_DEBUG(("Disconnecting remote host"));
1980 SILC_LOG_INFO(("Disconnecting %s:%d [%s]", sock->hostname,
1982 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
1983 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
1984 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
1987 /* Notify remote end that the conversation is over. The notify message
1988 is tried to be sent immediately. */
1989 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
1990 buf, strlen(buf), TRUE);
1992 /* Mark the connection to be disconnected */
1993 SILC_SET_DISCONNECTED(sock);
1994 silc_server_close_connection(server, sock);
1999 SilcClientEntry client;
2000 } *FreeClientInternal;
2002 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2004 FreeClientInternal i = (FreeClientInternal)context;
2006 silc_idlist_del_data(i->client);
2007 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2011 /* Frees client data and notifies about client's signoff. */
2013 void silc_server_free_client_data(SilcServer server,
2014 SilcSocketConnection sock,
2015 SilcClientEntry client,
2019 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2021 /* If there is pending outgoing data for the client then purge it
2022 to the network before removing the client entry. */
2023 if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
2024 (SILC_IS_DISCONNECTED(sock) == FALSE)) {
2025 server->stat.packets_sent++;
2027 if (sock->outbuf->data - sock->outbuf->head)
2028 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
2030 silc_server_packet_send_real(server, sock, TRUE);
2032 SILC_SET_CONNECTION_FOR_INPUT(sock->sock);
2033 SILC_UNSET_OUTBUF_PENDING(sock);
2034 silc_buffer_clear(sock->outbuf);
2037 /* Send SIGNOFF notify to routers. */
2038 if (notify && !server->standalone && server->router)
2039 silc_server_send_notify_signoff(server, server->router->connection,
2040 server->server_type == SILC_SERVER ?
2041 FALSE : TRUE, client->id,
2042 SILC_ID_CLIENT_LEN, signoff);
2044 /* Remove client from all channels */
2046 silc_server_remove_from_channels(server, NULL, client,
2047 TRUE, signoff, TRUE);
2049 silc_server_remove_from_channels(server, NULL, client,
2050 FALSE, NULL, FALSE);
2052 /* We will not delete the client entry right away. We will take it
2053 into history (for WHOWAS command) for 5 minutes */
2056 silc_task_register(server->timeout_queue, 0,
2057 silc_server_free_client_data_timeout,
2059 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2060 client->data.registered = FALSE;
2062 /* Free the client entry and everything in it */
2063 server->stat.my_clients--;
2064 server->stat.clients--;
2065 if (server->server_type == SILC_ROUTER)
2066 server->stat.cell_clients--;
2069 /* Frees user_data pointer from socket connection object. This also sends
2070 appropriate notify packets to the network to inform about leaving
2073 void silc_server_free_sock_user_data(SilcServer server,
2074 SilcSocketConnection sock)
2076 SILC_LOG_DEBUG(("Start"));
2078 switch(sock->type) {
2079 case SILC_SOCKET_TYPE_CLIENT:
2081 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2082 silc_server_free_client_data(server, sock, user_data, TRUE, NULL);
2085 case SILC_SOCKET_TYPE_SERVER:
2086 case SILC_SOCKET_TYPE_ROUTER:
2088 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2090 /* Send REMOVE_ID packet to routers. */
2091 if (!server->standalone && server->router)
2092 silc_server_send_notify_server_signoff(server,
2093 server->router->connection,
2094 server->server_type ==
2096 FALSE : TRUE, user_data->id,
2097 SILC_ID_SERVER_LEN);
2099 /* Then also free all client entries that this server owns as
2100 they will become invalid now as well. */
2101 silc_server_remove_clients_by_server(server, user_data);
2103 /* If this was our primary router connection then we're lost to
2104 the outside world. */
2105 if (server->router == user_data) {
2106 server->id_entry->router = NULL;
2107 server->router = NULL;
2108 server->standalone = TRUE;
2111 /* Free the server entry */
2112 silc_idlist_del_data(user_data);
2113 silc_idlist_del_server(server->local_list, user_data);
2114 server->stat.my_servers--;
2115 server->stat.servers--;
2116 if (server->server_type == SILC_ROUTER)
2117 server->stat.cell_servers--;
2122 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2124 silc_idlist_del_data(user_data);
2125 silc_free(user_data);
2130 sock->user_data = NULL;
2133 /* This function is used to remove all client entries by the server `entry'.
2134 This is called when the connection is lost to the server. In this case
2135 we must invalidate all the client entries owned by the server `entry'. */
2137 int silc_server_remove_clients_by_server(SilcServer server,
2138 SilcServerEntry entry)
2140 SilcIDCacheList list = NULL;
2141 SilcIDCacheEntry id_cache = NULL;
2142 SilcClientEntry client = NULL;
2144 SILC_LOG_DEBUG(("Start"));
2146 if (silc_idcache_find_by_id(server->local_list->clients,
2147 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2149 if (silc_idcache_list_first(list, &id_cache)) {
2151 client = (SilcClientEntry)id_cache->context;
2153 if (client->router != entry) {
2154 if (!silc_idcache_list_next(list, &id_cache))
2160 /* Remove the client entry */
2161 silc_server_remove_from_channels(server, NULL, client, TRUE,
2163 silc_idlist_del_client(server->local_list, client);
2165 if (!silc_idcache_list_next(list, &id_cache))
2169 silc_idcache_list_free(list);
2172 if (silc_idcache_find_by_id(server->global_list->clients,
2173 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
2175 if (silc_idcache_list_first(list, &id_cache)) {
2177 client = (SilcClientEntry)id_cache->context;
2179 if (client->router != entry) {
2180 if (!silc_idcache_list_next(list, &id_cache))
2186 /* Remove the client entry */
2187 silc_server_remove_from_channels(server, NULL, client, TRUE,
2189 silc_idlist_del_client(server->global_list, client);
2191 if (!silc_idcache_list_next(list, &id_cache))
2195 silc_idcache_list_free(list);
2201 /* Checks whether given channel has global users. If it does this returns
2202 TRUE and FALSE if there is only locally connected clients on the channel. */
2204 int silc_server_channel_has_global(SilcChannelEntry channel)
2206 SilcChannelClientEntry chl;
2208 silc_list_start(channel->user_list);
2209 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2210 if (chl->client->router)
2217 /* Checks whether given channel has locally connected users. If it does this
2218 returns TRUE and FALSE if there is not one locally connected client. */
2220 int silc_server_channel_has_local(SilcChannelEntry channel)
2222 SilcChannelClientEntry chl;
2224 silc_list_start(channel->user_list);
2225 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2226 if (!chl->client->router)
2233 /* Removes client from all channels it has joined. This is used when client
2234 connection is disconnected. If the client on a channel is last, the
2235 channel is removed as well. This sends the SIGNOFF notify types. */
2237 void silc_server_remove_from_channels(SilcServer server,
2238 SilcSocketConnection sock,
2239 SilcClientEntry client,
2241 char *signoff_message,
2244 SilcChannelEntry channel;
2245 SilcChannelClientEntry chl;
2248 SILC_LOG_DEBUG(("Start"));
2250 if (!client || !client->id)
2253 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2255 /* Remove the client from all channels. The client is removed from
2256 the channels' user list. */
2257 silc_list_start(client->channels);
2258 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2259 channel = chl->channel;
2261 /* Remove channel from client's channel list */
2262 silc_list_del(client->channels, chl);
2264 /* Remove channel if there is no users anymore */
2265 if (server->server_type == SILC_ROUTER &&
2266 silc_list_count(channel->user_list) < 2) {
2267 server->stat.my_channels--;
2269 if (channel->founder_key) {
2270 /* The founder auth data exists, do not remove the channel entry */
2271 SilcChannelClientEntry chl2;
2273 silc_free(channel->id);
2276 silc_list_start(channel->user_list);
2277 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2278 silc_list_del(chl2->client->channels, chl2);
2279 silc_list_del(channel->user_list, chl2);
2285 if (!silc_idlist_del_channel(server->local_list, channel))
2286 silc_idlist_del_channel(server->global_list, channel);
2290 /* Remove client from channel's client list */
2291 silc_list_del(channel->user_list, chl);
2293 server->stat.my_chanclients--;
2295 /* If there is no global users on the channel anymore mark the channel
2296 as local channel. */
2297 if (server->server_type == SILC_SERVER &&
2298 !silc_server_channel_has_global(channel))
2299 channel->global_users = FALSE;
2301 /* If there is not at least one local user on the channel then we don't
2302 need the channel entry anymore, we can remove it safely. */
2303 if (server->server_type == SILC_SERVER &&
2304 !silc_server_channel_has_local(channel)) {
2305 /* Notify about leaving client if this channel has global users. */
2306 if (notify && channel->global_users)
2307 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2308 SILC_NOTIFY_TYPE_SIGNOFF,
2309 signoff_message ? 2 : 1,
2310 clidp->data, clidp->len,
2311 signoff_message, signoff_message ?
2312 strlen(signoff_message) : 0);
2314 server->stat.my_channels--;
2316 if (channel->founder_key) {
2317 /* The founder auth data exists, do not remove the channel entry */
2318 SilcChannelClientEntry chl2;
2320 silc_free(channel->id);
2323 silc_list_start(channel->user_list);
2324 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2325 silc_list_del(chl2->client->channels, chl2);
2326 silc_list_del(channel->user_list, chl2);
2332 if (!silc_idlist_del_channel(server->local_list, channel))
2333 silc_idlist_del_channel(server->global_list, channel);
2337 /* Send notify to channel about client leaving SILC and thus
2338 the entire channel. */
2340 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2341 SILC_NOTIFY_TYPE_SIGNOFF,
2342 signoff_message ? 2 : 1,
2343 clidp->data, clidp->len,
2344 signoff_message, signoff_message ?
2345 strlen(signoff_message) : 0);
2347 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2348 /* Re-generate channel key */
2349 silc_server_create_channel_key(server, channel, 0);
2351 /* Send the channel key to the channel. The key of course is not sent
2352 to the client who was removed f rom the channel. */
2353 silc_server_send_channel_key(server, client->connection, channel,
2354 server->server_type == SILC_ROUTER ?
2355 FALSE : !server->standalone);
2359 silc_buffer_free(clidp);
2362 /* Removes client from one channel. This is used for example when client
2363 calls LEAVE command to remove itself from the channel. Returns TRUE
2364 if channel still exists and FALSE if the channel is removed when
2365 last client leaves the channel. If `notify' is FALSE notify messages
2368 int silc_server_remove_from_one_channel(SilcServer server,
2369 SilcSocketConnection sock,
2370 SilcChannelEntry channel,
2371 SilcClientEntry client,
2374 SilcChannelEntry ch;
2375 SilcChannelClientEntry chl;
2378 SILC_LOG_DEBUG(("Start"));
2380 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2382 /* Remove the client from the channel. The client is removed from
2383 the channel's user list. */
2384 silc_list_start(client->channels);
2385 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2386 if (chl->channel != channel)
2391 /* Remove channel from client's channel list */
2392 silc_list_del(client->channels, chl);
2394 /* Remove channel if there is no users anymore */
2395 if (server->server_type == SILC_ROUTER &&
2396 silc_list_count(channel->user_list) < 2) {
2397 if (!silc_idlist_del_channel(server->local_list, channel))
2398 silc_idlist_del_channel(server->global_list, channel);
2399 silc_buffer_free(clidp);
2400 server->stat.my_channels--;
2404 /* Remove client from channel's client list */
2405 silc_list_del(channel->user_list, chl);
2407 server->stat.my_chanclients--;
2409 /* If there is no global users on the channel anymore mark the channel
2410 as local channel. */
2411 if (server->server_type == SILC_SERVER &&
2412 !silc_server_channel_has_global(channel))
2413 channel->global_users = FALSE;
2415 /* If there is not at least one local user on the channel then we don't
2416 need the channel entry anymore, we can remove it safely. */
2417 if (server->server_type == SILC_SERVER &&
2418 !silc_server_channel_has_local(channel)) {
2419 /* Notify about leaving client if this channel has global users. */
2420 if (notify && channel->global_users)
2421 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2422 SILC_NOTIFY_TYPE_LEAVE, 1,
2423 clidp->data, clidp->len);
2425 server->stat.my_channels--;
2426 silc_buffer_free(clidp);
2428 if (channel->founder_key) {
2429 /* The founder auth data exists, do not remove the channel entry */
2430 SilcChannelClientEntry chl2;
2432 silc_free(channel->id);
2435 silc_list_start(channel->user_list);
2436 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2437 silc_list_del(chl2->client->channels, chl2);
2438 silc_list_del(channel->user_list, chl2);
2444 if (!silc_idlist_del_channel(server->local_list, channel))
2445 silc_idlist_del_channel(server->global_list, channel);
2449 /* Send notify to channel about client leaving the channel */
2451 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2452 SILC_NOTIFY_TYPE_LEAVE, 1,
2453 clidp->data, clidp->len);
2457 silc_buffer_free(clidp);
2461 /* Returns TRUE if the given client is on the channel. FALSE if not.
2462 This works because we assure that the user list on the channel is
2463 always in up to date thus we can only check the channel list from
2464 `client' which is faster than checking the user list from `channel'. */
2466 int silc_server_client_on_channel(SilcClientEntry client,
2467 SilcChannelEntry channel)
2469 SilcChannelClientEntry chl;
2471 if (!client || !channel)
2474 silc_list_start(client->channels);
2475 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END)
2476 if (chl->channel == channel)
2482 /* Timeout callback. This is called if connection is idle or for some
2483 other reason is not responding within some period of time. This
2484 disconnects the remote end. */
2486 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2488 SilcServer server = (SilcServer)context;
2489 SilcSocketConnection sock = server->sockets[fd];
2494 if (sock->user_data)
2495 silc_server_free_sock_user_data(server, sock);
2497 silc_server_disconnect_remote(server, sock,
2498 "Server closed connection: "
2499 "Connection timeout");
2502 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2503 function may be used only by router. In real SILC network all channels
2504 are created by routers thus this function is never used by normal
2507 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2508 SilcServerID *router_id,
2514 SilcChannelID *channel_id;
2515 SilcChannelEntry entry;
2519 SILC_LOG_DEBUG(("Creating new channel"));
2522 cipher = "aes-256-cbc";
2524 hmac = "hmac-sha1-96";
2526 /* Allocate cipher */
2527 if (!silc_cipher_alloc(cipher, &key))
2531 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2532 silc_cipher_free(key);
2536 channel_name = strdup(channel_name);
2538 /* Create the channel */
2539 silc_id_create_channel_id(router_id, server->rng, &channel_id);
2540 entry = silc_idlist_add_channel(server->local_list, channel_name,
2541 SILC_CHANNEL_MODE_NONE, channel_id,
2542 NULL, key, newhmac);
2544 silc_free(channel_name);
2548 entry->cipher = strdup(cipher);
2549 entry->hmac_name = strdup(hmac);
2551 /* Now create the actual key material */
2552 silc_server_create_channel_key(server, entry,
2553 silc_cipher_get_key_len(key) / 8);
2555 /* Notify other routers about the new channel. We send the packet
2556 to our primary route. */
2557 if (broadcast && server->standalone == FALSE)
2558 silc_server_send_new_channel(server, server->router->connection, TRUE,
2559 channel_name, entry->id, SILC_ID_CHANNEL_LEN,
2562 server->stat.my_channels++;
2567 /* Same as above but creates the channel with Channel ID `channel_id. */
2570 silc_server_create_new_channel_with_id(SilcServer server,
2574 SilcChannelID *channel_id,
2577 SilcChannelEntry entry;
2581 SILC_LOG_DEBUG(("Creating new channel"));
2584 cipher = "aes-256-cbc";
2586 hmac = "hmac-sha1-96";
2588 /* Allocate cipher */
2589 if (!silc_cipher_alloc(cipher, &key))
2593 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2594 silc_cipher_free(key);
2598 channel_name = strdup(channel_name);
2600 /* Create the channel */
2601 entry = silc_idlist_add_channel(server->local_list, channel_name,
2602 SILC_CHANNEL_MODE_NONE, channel_id,
2603 NULL, key, newhmac);
2605 silc_free(channel_name);
2609 /* Now create the actual key material */
2610 silc_server_create_channel_key(server, entry,
2611 silc_cipher_get_key_len(key) / 8);
2613 /* Notify other routers about the new channel. We send the packet
2614 to our primary route. */
2615 if (broadcast && server->standalone == FALSE)
2616 silc_server_send_new_channel(server, server->router->connection, TRUE,
2617 channel_name, entry->id, SILC_ID_CHANNEL_LEN,
2620 server->stat.my_channels++;
2625 /* Generates new channel key. This is used to create the initial channel key
2626 but also to re-generate new key for channel. If `key_len' is provided
2627 it is the bytes of the key length. */
2629 void silc_server_create_channel_key(SilcServer server,
2630 SilcChannelEntry channel,
2631 unsigned int key_len)
2634 unsigned char channel_key[32], hash[32];
2637 SILC_LOG_DEBUG(("Generating channel key"));
2639 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
2640 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
2644 if (!channel->channel_key)
2645 if (!silc_cipher_alloc("aes-256-cbc", &channel->channel_key))
2650 else if (channel->key_len)
2651 len = channel->key_len / 8;
2653 len = silc_cipher_get_key_len(channel->channel_key) / 8;
2655 /* Create channel key */
2656 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
2659 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
2661 /* Remove old key if exists */
2663 memset(channel->key, 0, channel->key_len / 8);
2664 silc_free(channel->key);
2668 channel->key_len = len * 8;
2669 channel->key = silc_calloc(len, sizeof(*channel->key));
2670 memcpy(channel->key, channel_key, len);
2671 memset(channel_key, 0, sizeof(channel_key));
2673 /* Generate HMAC key from the channel key data and set it */
2675 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2676 silc_hash_make(channel->hmac->hash, channel->key, len, hash);
2677 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2678 memset(hash, 0, sizeof(hash));
2681 /* Saves the channel key found in the encoded `key_payload' buffer. This
2682 function is used when we receive Channel Key Payload and also when we're
2683 processing JOIN command reply. Returns entry to the channel. */
2685 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
2686 SilcBuffer key_payload,
2687 SilcChannelEntry channel)
2689 SilcChannelKeyPayload payload = NULL;
2690 SilcChannelID *id = NULL;
2691 unsigned char *tmp, hash[32];
2692 unsigned int tmp_len;
2695 SILC_LOG_DEBUG(("Start"));
2697 /* Decode channel key payload */
2698 payload = silc_channel_key_payload_parse(key_payload);
2700 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
2705 /* Get the channel entry */
2708 /* Get channel ID */
2709 tmp = silc_channel_key_get_id(payload, &tmp_len);
2710 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
2716 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
2718 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
2720 SILC_LOG_ERROR(("Received key for non-existent channel"));
2726 tmp = silc_channel_key_get_key(payload, &tmp_len);
2732 cipher = silc_channel_key_get_cipher(payload, NULL);
2738 /* Remove old key if exists */
2740 memset(channel->key, 0, channel->key_len / 8);
2741 silc_free(channel->key);
2742 silc_cipher_free(channel->channel_key);
2745 /* Create new cipher */
2746 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
2751 if (channel->cipher)
2752 silc_free(channel->cipher);
2753 channel->cipher = strdup(cipher);
2756 channel->key_len = tmp_len * 8;
2757 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
2758 memcpy(channel->key, tmp, tmp_len);
2759 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
2761 /* Generate HMAC key from the channel key data and set it */
2763 silc_hmac_alloc("hmac-sha1-96", NULL, &channel->hmac);
2764 silc_hash_make(channel->hmac->hash, tmp, tmp_len, hash);
2765 silc_hmac_set_key(channel->hmac, hash, silc_hash_len(channel->hmac->hash));
2767 memset(hash, 0, sizeof(hash));
2768 memset(tmp, 0, tmp_len);
2774 silc_channel_key_payload_free(payload);
2779 /* Heartbeat callback. This function is set as argument for the
2780 silc_socket_set_heartbeat function. The library will call this function
2781 at the set time interval. */
2783 void silc_server_perform_heartbeat(SilcSocketConnection sock,
2786 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
2788 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname,
2791 /* Send the heartbeat */
2792 silc_server_send_heartbeat(hb->server, sock);
2795 /* Returns assembled of all servers in the given ID list. The packet's
2796 form is dictated by the New ID payload. */
2798 static void silc_server_announce_get_servers(SilcServer server,
2800 SilcBuffer *servers)
2802 SilcIDCacheList list;
2803 SilcIDCacheEntry id_cache;
2804 SilcServerEntry entry;
2807 /* Go through all clients in the list */
2808 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
2809 SILC_ID_SERVER, &list)) {
2810 if (silc_idcache_list_first(list, &id_cache)) {
2812 entry = (SilcServerEntry)id_cache->context;
2814 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2816 *servers = silc_buffer_realloc(*servers,
2818 (*servers)->truelen + idp->len :
2820 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
2821 silc_buffer_put(*servers, idp->data, idp->len);
2822 silc_buffer_pull(*servers, idp->len);
2823 silc_buffer_free(idp);
2825 if (!silc_idcache_list_next(list, &id_cache))
2830 silc_idcache_list_free(list);
2834 /* This function is used by router to announce existing servers to our
2835 primary router when we've connected to it. */
2837 void silc_server_announce_servers(SilcServer server)
2839 SilcBuffer servers = NULL;
2841 SILC_LOG_DEBUG(("Announcing servers"));
2843 /* Get servers in local list */
2844 silc_server_announce_get_servers(server, server->local_list, &servers);
2846 /* Get servers in global list */
2847 silc_server_announce_get_servers(server, server->global_list, &servers);
2850 silc_buffer_push(servers, servers->data - servers->head);
2851 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
2853 /* Send the packet */
2854 silc_server_packet_send(server, server->router->connection,
2855 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
2856 servers->data, servers->len, TRUE);
2858 silc_buffer_free(servers);
2862 /* Returns assembled packet of all clients in the given ID list. The
2863 packet's form is dictated by the New ID Payload. */
2865 static void silc_server_announce_get_clients(SilcServer server,
2867 SilcBuffer *clients)
2869 SilcIDCacheList list;
2870 SilcIDCacheEntry id_cache;
2871 SilcClientEntry client;
2874 /* Go through all clients in the list */
2875 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
2876 SILC_ID_CLIENT, &list)) {
2877 if (silc_idcache_list_first(list, &id_cache)) {
2879 client = (SilcClientEntry)id_cache->context;
2881 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2883 *clients = silc_buffer_realloc(*clients,
2885 (*clients)->truelen + idp->len :
2887 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
2888 silc_buffer_put(*clients, idp->data, idp->len);
2889 silc_buffer_pull(*clients, idp->len);
2890 silc_buffer_free(idp);
2892 if (!silc_idcache_list_next(list, &id_cache))
2897 silc_idcache_list_free(list);
2901 /* This function is used to announce our existing clients to our router
2902 when we've connected to it. */
2904 void silc_server_announce_clients(SilcServer server)
2906 SilcBuffer clients = NULL;
2908 SILC_LOG_DEBUG(("Announcing clients"));
2910 /* Get clients in local list */
2911 silc_server_announce_get_clients(server, server->local_list,
2914 /* As router we announce our global list as well */
2915 if (server->server_type == SILC_ROUTER)
2916 silc_server_announce_get_clients(server, server->global_list,
2920 silc_buffer_push(clients, clients->data - clients->head);
2921 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
2923 /* Send the packet */
2924 silc_server_packet_send(server, server->router->connection,
2925 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
2926 clients->data, clients->len, TRUE);
2928 silc_buffer_free(clients);
2933 silc_server_announce_encode_join(unsigned int argc, ...)
2938 return silc_notify_payload_encode(SILC_NOTIFY_TYPE_JOIN, argc, ap);
2941 /* Returns assembled packets for channel users of the `channel'. */
2943 void silc_server_announce_get_channel_users(SilcServer server,
2944 SilcChannelEntry channel,
2945 SilcBuffer *channel_users)
2947 SilcChannelClientEntry chl;
2948 SilcBuffer chidp, clidp;
2952 SILC_LOG_DEBUG(("Start"));
2954 /* Now find all users on the channel */
2955 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2956 silc_list_start(channel->user_list);
2957 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2958 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
2959 tmp = silc_server_announce_encode_join(2, clidp->data, clidp->len,
2960 chidp->data, chidp->len);
2963 silc_buffer_realloc(*channel_users,
2965 (*channel_users)->truelen + len : len));
2966 silc_buffer_pull_tail(*channel_users,
2967 ((*channel_users)->end -
2968 (*channel_users)->data));
2970 silc_buffer_put(*channel_users, tmp->data, tmp->len);
2971 silc_buffer_pull(*channel_users, len);
2972 silc_buffer_free(clidp);
2973 silc_buffer_free(tmp);
2975 silc_buffer_free(chidp);
2978 /* Returns assembled packets for all channels and users on those channels
2979 from the given ID List. The packets are in the form dictated by the
2980 New Channel and New Channel User payloads. */
2982 void silc_server_announce_get_channels(SilcServer server,
2984 SilcBuffer *channels,
2985 SilcBuffer *channel_users)
2987 SilcIDCacheList list;
2988 SilcIDCacheEntry id_cache;
2989 SilcChannelEntry channel;
2991 unsigned short name_len;
2994 SILC_LOG_DEBUG(("Start"));
2996 /* Go through all channels in the list */
2997 if (silc_idcache_find_by_id(id_list->channels, SILC_ID_CACHE_ANY,
2998 SILC_ID_CHANNEL, &list)) {
2999 if (silc_idcache_list_first(list, &id_cache)) {
3001 channel = (SilcChannelEntry)id_cache->context;
3003 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3004 name_len = strlen(channel->channel_name);
3006 len = 4 + name_len + SILC_ID_CHANNEL_LEN + 4;
3008 silc_buffer_realloc(*channels,
3009 (*channels ? (*channels)->truelen + len : len));
3010 silc_buffer_pull_tail(*channels,
3011 ((*channels)->end - (*channels)->data));
3012 silc_buffer_format(*channels,
3013 SILC_STR_UI_SHORT(name_len),
3014 SILC_STR_UI_XNSTRING(channel->channel_name,
3016 SILC_STR_UI_SHORT(SILC_ID_CHANNEL_LEN),
3017 SILC_STR_UI_XNSTRING(cid, SILC_ID_CHANNEL_LEN),
3018 SILC_STR_UI_INT(channel->mode),
3020 silc_buffer_pull(*channels, len);
3022 silc_server_announce_get_channel_users(server, channel,
3027 if (!silc_idcache_list_next(list, &id_cache))
3032 silc_idcache_list_free(list);
3036 /* This function is used to announce our existing channels to our router
3037 when we've connected to it. This also announces the users on the
3038 channels to the router. */
3040 void silc_server_announce_channels(SilcServer server)
3042 SilcBuffer channels = NULL, channel_users = NULL;
3044 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3046 /* Get channels and channel users in local list */
3047 silc_server_announce_get_channels(server, server->local_list,
3048 &channels, &channel_users);
3050 /* Get channels and channel users in global list */
3051 silc_server_announce_get_channels(server, server->global_list,
3052 &channels, &channel_users);
3055 silc_buffer_push(channels, channels->data - channels->head);
3056 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3058 /* Send the packet */
3059 silc_server_packet_send(server, server->router->connection,
3060 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3061 channels->data, channels->len,
3064 silc_buffer_free(channels);
3067 if (channel_users) {
3068 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3069 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3070 channel_users->len);
3072 /* Send the packet */
3073 silc_server_packet_send(server, server->router->connection,
3074 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3075 channel_users->data, channel_users->len,
3078 silc_buffer_free(channel_users);
3082 /* Failure timeout callback. If this is called then we will immediately
3083 process the received failure. We always process the failure with timeout
3084 since we do not want to blindly trust to received failure packets.
3085 This won't be called (the timeout is cancelled) if the failure was
3086 bogus (it is bogus if remote does not close the connection after sending
3089 SILC_TASK_CALLBACK(silc_server_failure_callback)
3091 SilcServerFailureContext f = (SilcServerFailureContext)context;
3093 if (f->sock->protocol) {
3094 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3095 f->sock->protocol->execute(f->server->timeout_queue, 0,
3096 f->sock->protocol, f->sock->sock, 0, 0);
3102 /* Assembles user list and users mode list from the `channel'. */
3104 void silc_server_get_users_on_channel(SilcServer server,
3105 SilcChannelEntry channel,
3106 SilcBuffer *user_list,
3107 SilcBuffer *mode_list,
3108 unsigned int *user_count)
3110 SilcChannelClientEntry chl;
3111 SilcBuffer client_id_list;
3112 SilcBuffer client_mode_list;
3114 unsigned int list_count = 0;
3116 client_id_list = silc_buffer_alloc((SILC_ID_CLIENT_LEN + 4) *
3117 silc_list_count(channel->user_list));
3118 client_mode_list = silc_buffer_alloc(4 *
3119 silc_list_count(channel->user_list));
3120 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3121 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3122 silc_list_start(channel->user_list);
3123 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
3125 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3126 silc_buffer_put(client_id_list, idp->data, idp->len);
3127 silc_buffer_pull(client_id_list, idp->len);
3128 silc_buffer_free(idp);
3130 /* Client's mode on channel */
3131 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3132 silc_buffer_pull(client_mode_list, 4);
3136 silc_buffer_push(client_id_list,
3137 client_id_list->data - client_id_list->head);
3138 silc_buffer_push(client_mode_list,
3139 client_mode_list->data - client_mode_list->head);
3141 *user_list = client_id_list;
3142 *mode_list = client_mode_list;
3143 *user_count = list_count;
3146 /* Saves users and their modes to the `channel'. */
3148 void silc_server_save_users_on_channel(SilcServer server,
3149 SilcSocketConnection sock,
3150 SilcChannelEntry channel,
3151 SilcClientID *noadd,
3152 SilcBuffer user_list,
3153 SilcBuffer mode_list,
3154 unsigned int user_count)
3158 /* Cache the received Client ID's and modes. This cache expires
3159 whenever server sends notify message to channel. It means two things;
3160 some user has joined or leaved the channel. XXX TODO! */
3161 for (i = 0; i < user_count; i++) {
3162 unsigned short idp_len;
3164 SilcClientID *client_id;
3165 SilcClientEntry client;
3168 SILC_GET16_MSB(idp_len, user_list->data + 2);
3170 client_id = silc_id_payload_parse_id(user_list->data, idp_len);
3171 silc_buffer_pull(user_list, idp_len);
3176 SILC_GET32_MSB(mode, mode_list->data);
3177 silc_buffer_pull(mode_list, 4);
3179 if (noadd && !SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3180 silc_free(client_id);
3184 /* Check if we have this client cached already. */
3185 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3188 client = silc_idlist_find_client_by_id(server->global_list,
3191 /* If router did not find such Client ID in its lists then this must
3192 be bogus client or some router in the net is buggy. */
3193 if (server->server_type == SILC_ROUTER) {
3194 silc_free(client_id);
3198 /* We don't have that client anywhere, add it. The client is added
3199 to global list since server didn't have it in the lists so it must be
3201 client = silc_idlist_add_client(server->global_list, NULL, 0, NULL,
3203 silc_id_dup(client_id, SILC_ID_CLIENT),
3204 sock->user_data, NULL);
3206 silc_free(client_id);
3210 client->data.registered = TRUE;
3213 silc_free(client_id);
3215 if (!silc_server_client_on_channel(client, channel)) {
3216 /* Client was not on the channel, add it. */
3217 SilcChannelClientEntry chl = silc_calloc(1, sizeof(*chl));
3218 chl->client = client;
3220 chl->channel = channel;
3221 silc_list_add(channel->user_list, chl);
3222 silc_list_add(client->channels, chl);
3227 /* Lookups route to the client indicated by `id' client ID. The connection
3228 object and internal data object is returned. Returns NULL if route
3229 could not be found to the client. If the `client_id' is specified then
3230 it is used and the `id_data' is ignored. */
3232 SilcSocketConnection silc_server_get_client_route(SilcServer server,
3233 unsigned char *id_data,
3234 unsigned int id_len,
3235 SilcClientID *client_id,
3236 SilcIDListData *idata)
3239 SilcClientEntry client;
3241 SILC_LOG_DEBUG(("Start"));
3243 /* Decode destination Client ID */
3245 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
3247 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
3251 id = silc_id_dup(client_id, SILC_ID_CLIENT);
3254 /* If the destination belongs to our server we don't have to route
3255 the packet anywhere but to send it to the local destination. */
3256 client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
3260 if (client && client->data.registered == FALSE)
3263 /* If we are router and the client has router then the client is in
3264 our cell but not directly connected to us. */
3265 if (server->server_type == SILC_ROUTER && client->router) {
3266 /* We are of course in this case the client's router thus the real
3267 "router" of the client is the server who owns the client. Thus
3268 we will send the packet to that server. */
3269 *idata = (SilcIDListData)client->router;
3270 return client->router->connection;
3273 /* Seems that client really is directly connected to us */
3274 *idata = (SilcIDListData)client;
3275 return client->connection;
3278 /* Destination belongs to someone not in this server. If we are normal
3279 server our action is to send the packet to our router. */
3280 if (server->server_type == SILC_SERVER && !server->standalone) {
3282 *idata = (SilcIDListData)server->router;
3283 return server->router->connection;
3286 /* We are router and we will perform route lookup for the destination
3287 and send the packet to fastest route. */
3288 if (server->server_type == SILC_ROUTER && !server->standalone) {
3289 /* Check first that the ID is valid */
3290 client = silc_idlist_find_client_by_id(server->global_list, id, NULL);
3292 SilcSocketConnection dst_sock;
3294 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
3297 *idata = (SilcIDListData)dst_sock->user_data;
3306 /* Encodes and returns channel list of channels the `client' has joined.
3307 Secret channels are not put to the list. */
3309 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
3310 SilcClientEntry client)
3312 SilcBuffer buffer = NULL;
3313 SilcChannelEntry channel;
3314 SilcChannelClientEntry chl;
3316 unsigned short name_len;
3319 silc_list_start(client->channels);
3320 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
3321 channel = chl->channel;
3323 if (channel->mode & SILC_CHANNEL_MODE_SECRET)
3326 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3327 name_len = strlen(channel->channel_name);
3329 len = 4 + name_len + SILC_ID_CHANNEL_LEN + 4;
3330 buffer = silc_buffer_realloc(buffer,
3331 (buffer ? (buffer)->truelen + len : len));
3332 silc_buffer_pull_tail(buffer, ((buffer)->end - (buffer)->data));
3333 silc_buffer_format(buffer,
3334 SILC_STR_UI_SHORT(name_len),
3335 SILC_STR_UI_XNSTRING(channel->channel_name,
3337 SILC_STR_UI_SHORT(SILC_ID_CHANNEL_LEN),
3338 SILC_STR_UI_XNSTRING(cid, SILC_ID_CHANNEL_LEN),
3339 SILC_STR_UI_INT(chl->mode), /* Client's mode */
3341 silc_buffer_pull(buffer, len);
3346 silc_buffer_push(buffer, buffer->data - buffer->head);
3351 /* Finds client entry by Client ID and if it is not found then resolves
3352 it using WHOIS command. */
3354 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
3355 SilcClientID *client_id)
3357 SilcClientEntry client;
3359 client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL);
3361 client = silc_idlist_find_client_by_id(server->global_list,
3363 if (!client && server->server_type == SILC_ROUTER)
3367 if (!client && server->standalone)
3370 if (!client || !client->nickname || !client->username) {
3371 SilcBuffer buffer, idp;
3373 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
3374 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
3375 ++server->cmd_ident, 1,
3376 3, idp->data, idp->len);
3377 silc_server_packet_send(server, client ? client->router->connection :
3378 server->router->connection,
3379 SILC_PACKET_COMMAND, 0,
3380 buffer->data, buffer->len, FALSE);
3381 silc_buffer_free(idp);
3382 silc_buffer_free(buffer);