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);
42 /* Allocates a new SILC server object. This has to be done before the server
43 can be used. After allocation one must call silc_server_init to initialize
44 the server. The new allocated server object is returned to the new_server
47 int silc_server_alloc(SilcServer *new_server)
51 SILC_LOG_DEBUG(("Allocating new server object"));
53 server = silc_calloc(1, sizeof(*server));
54 server->server_type = SILC_SERVER;
55 server->standalone = TRUE;
56 server->local_list = silc_calloc(1, sizeof(*server->local_list));
57 server->global_list = silc_calloc(1, sizeof(*server->global_list));
58 server->pending_commands = silc_dlist_init();
60 server->sim = silc_dlist_init();
68 /* Free's the SILC server object. This is called at the very end before
71 void silc_server_free(SilcServer server)
78 if (server->local_list)
79 silc_free(server->local_list);
80 if (server->global_list)
81 silc_free(server->global_list);
83 silc_rng_free(server->rng);
86 while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
87 silc_dlist_del(server->sim, sim);
90 silc_dlist_uninit(server->sim);
94 silc_free(server->params);
96 if (server->pending_commands)
97 silc_dlist_uninit(server->pending_commands);
103 /* Initializes the entire SILC server. This is called always before running
104 the server. This is called only once at the initialization of the program.
105 This binds the server to its listenning port. After this function returns
106 one should call silc_server_run to start the server. This returns TRUE
107 when everything is ok to run the server. Configuration file must be
108 read and parsed before calling this. */
110 int silc_server_init(SilcServer server)
112 int *sock = NULL, sock_count = 0, i;
114 SilcServerEntry id_entry;
116 SILC_LOG_DEBUG(("Initializing server"));
118 assert(server->config);
120 /* XXX After server is made as Silc Server Library this can be given
121 as argument, for now this is hard coded */
122 server->params = silc_calloc(1, sizeof(*server->params));
123 server->params->retry_count = SILC_SERVER_RETRY_COUNT;
124 server->params->retry_interval_min = SILC_SERVER_RETRY_INTERVAL_MIN;
125 server->params->retry_interval_max = SILC_SERVER_RETRY_INTERVAL_MAX;
126 server->params->retry_keep_trying = FALSE;
127 server->params->protocol_timeout = 60;
128 server->params->require_reverse_mapping = FALSE;
130 /* Set log files where log message should be saved. */
131 server->config->server = server;
132 silc_server_config_setlogfiles(server->config);
134 /* Register all configured ciphers, PKCS and hash functions. */
135 silc_server_config_register_ciphers(server->config);
136 silc_server_config_register_pkcs(server->config);
137 silc_server_config_register_hashfuncs(server->config);
139 /* Initialize random number generator for the server. */
140 server->rng = silc_rng_alloc();
141 silc_rng_init(server->rng);
142 silc_rng_global_init(server->rng);
144 /* Initialize hash functions for server to use */
145 silc_hash_alloc("md5", &server->md5hash);
146 silc_hash_alloc("sha1", &server->sha1hash);
148 /* Initialize none cipher */
149 silc_cipher_alloc("none", &server->none_cipher);
151 /* XXXXX Generate RSA key pair */
153 unsigned char *public_key;
154 unsigned char *private_key;
155 unsigned int pk_len, prv_len;
158 if (stat("pubkey.pub", &st) < 0 && stat("privkey.prv", &st) < 0) {
160 if (silc_pkcs_alloc("rsa", &server->pkcs) == FALSE) {
161 SILC_LOG_ERROR(("Could not create RSA key pair"));
165 if (server->pkcs->pkcs->init(server->pkcs->context,
166 1024, server->rng) == FALSE) {
167 SILC_LOG_ERROR(("Could not generate RSA key pair"));
171 public_key = server->pkcs->pkcs->get_public_key(server->pkcs->context,
173 private_key = server->pkcs->pkcs->get_private_key(server->pkcs->context,
176 SILC_LOG_HEXDUMP(("public key"), public_key, pk_len);
177 SILC_LOG_HEXDUMP(("private key"), private_key, prv_len);
180 silc_pkcs_public_key_alloc("rsa", "UN=root, HN=dummy",
182 server->private_key =
183 silc_pkcs_private_key_alloc("rsa", private_key, prv_len);
186 silc_pkcs_save_public_key("pubkey.pub", server->public_key,
188 silc_pkcs_save_private_key("privkey.prv", server->private_key, NULL,
191 memset(public_key, 0, pk_len);
192 memset(private_key, 0, prv_len);
193 silc_free(public_key);
194 silc_free(private_key);
196 silc_pkcs_load_public_key("pubkey.pub", &server->public_key,
198 silc_pkcs_load_private_key("privkey.prv", &server->private_key,
203 /* Create a listening server. Note that our server can listen on
204 multiple ports. All listeners are created here and now. */
205 /* XXX Still check this whether to use server_info or listen_port. */
207 while(server->config->listen_port) {
210 tmp = silc_net_create_server(server->config->listen_port->port,
211 server->config->listen_port->host);
215 sock = silc_realloc(sock, (sizeof(int *) * (sock_count + 1)));
216 sock[sock_count] = tmp;
217 server->config->listen_port = server->config->listen_port->next;
221 /* Initialize ID caches */
222 server->local_list->clients = silc_idcache_alloc(0);
223 server->local_list->servers = silc_idcache_alloc(0);
224 server->local_list->channels = silc_idcache_alloc(0);
226 /* These are allocated for normal server as well as these hold some
227 global information that the server has fetched from its router. For
228 router these are used as they are supposed to be used on router. */
229 server->global_list->clients = silc_idcache_alloc(0);
230 server->global_list->servers = silc_idcache_alloc(0);
231 server->global_list->channels = silc_idcache_alloc(0);
233 /* Allocate the entire socket list that is used in server. Eventually
234 all connections will have entry in this table (it is a table of
235 pointers to the actual object that is allocated individually
237 server->sockets = silc_calloc(SILC_SERVER_MAX_CONNECTIONS,
238 sizeof(*server->sockets));
240 for (i = 0; i < sock_count; i++) {
241 SilcSocketConnection newsocket = NULL;
243 /* Set socket to non-blocking mode */
244 silc_net_set_socket_nonblock(sock[i]);
245 server->sock = sock[i];
247 /* Create a Server ID for the server. */
248 silc_id_create_server_id(sock[i], server->rng, &id);
254 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
255 server->id_string_len = silc_id_get_len(SILC_ID_SERVER);
256 server->id_type = SILC_ID_SERVER;
257 server->server_name = server->config->server_info->server_name;
259 /* Add ourselves to the server list. We don't have a router yet
260 beacuse we haven't established a route yet. It will be done later.
261 For now, NULL is sent as router. This allocates new entry to
264 silc_idlist_add_server(server->local_list,
265 server->config->server_info->server_name,
266 server->server_type, server->id, NULL, NULL);
268 SILC_LOG_ERROR(("Could not add ourselves to cache"));
272 /* Add ourselves also to the socket table. The entry allocated above
273 is sent as argument for fast referencing in the future. */
274 silc_socket_alloc(sock[i], SILC_SOCKET_TYPE_SERVER, id_entry,
279 server->sockets[sock[i]] = newsocket;
281 /* Put the allocated socket pointer also to the entry allocated above
282 for fast back-referencing to the socket list. */
283 id_entry->connection = (void *)server->sockets[sock[i]];
284 server->id_entry = id_entry;
287 /* Register the task queues. In SILC we have by default three task queues.
288 One task queue for non-timeout tasks which perform different kind of
289 I/O on file descriptors, timeout task queue for timeout tasks, and,
290 generic non-timeout task queue whose tasks apply to all connections. */
291 silc_task_queue_alloc(&server->io_queue, TRUE);
292 if (!server->io_queue) {
295 silc_task_queue_alloc(&server->timeout_queue, TRUE);
296 if (!server->timeout_queue) {
299 silc_task_queue_alloc(&server->generic_queue, TRUE);
300 if (!server->generic_queue) {
304 /* Register protocols */
305 silc_server_protocols_register();
307 /* Initialize the scheduler */
308 silc_schedule_init(&server->io_queue, &server->timeout_queue,
309 &server->generic_queue,
310 SILC_SERVER_MAX_CONNECTIONS);
312 /* Add the first task to the queue. This is task that is executed by
313 timeout. It expires as soon as the caller calls silc_server_run. This
314 task performs authentication protocol and key exchange with our
316 silc_task_register(server->timeout_queue, sock[0],
317 silc_server_connect_to_router,
318 (void *)server, 0, 1,
320 SILC_TASK_PRI_NORMAL);
322 /* Add listener task to the queue. This task receives new connections to the
323 server. This task remains on the queue until the end of the program. */
324 silc_task_register(server->io_queue, sock[0],
325 silc_server_accept_new_connection,
326 (void *)server, 0, 0,
328 SILC_TASK_PRI_NORMAL);
329 server->listenning = TRUE;
331 /* If server connections has been configured then we must be router as
332 normal server cannot have server connections, only router connections. */
333 if (server->config->servers)
334 server->server_type = SILC_ROUTER;
336 SILC_LOG_DEBUG(("Server initialized"));
338 /* We are done here, return succesfully */
341 silc_task_queue_free(server->timeout_queue);
343 silc_task_queue_free(server->io_queue);
345 for (i = 0; i < sock_count; i++)
346 silc_net_close_server(sock[i]);
351 /* Fork server to background and set gid+uid to non-root.
352 Silcd will not run as root, so trying to set either user or group to
353 root will cause silcd to exit. */
355 void silc_server_daemonise(SilcServer server)
357 /* Are we executing silcd as root or a regular user? */
364 if (!server->config->identity || !server->config->identity->user ||
365 !server->config->identity->group) {
366 fprintf(stderr, "Error:"
367 "\tSILC server must not be run as root. For the security of your\n"
368 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
369 "\tuser account. Modify the [Identity] configuration section to run\n"
370 "\tthe server as non-root user.\n");
374 /* Get the values given for user and group in configuration file */
375 user=server->config->identity->user;
376 group=server->config->identity->group;
378 /* Check whether the user/group information is text */
379 if (atoi(user)!=0 || atoi(group)!=0) {
380 SILC_LOG_DEBUG(("Invalid user and/or group information"));
381 SILC_LOG_DEBUG(("User and/or group given as number"));
382 fprintf(stderr, "Invalid user and/or group information\n");
383 fprintf(stderr, "Please assign them as names, not numbers\n");
387 /* Catch the nasty incident of string "0" returning 0 from atoi */
388 if (strcmp("0", user)==0 || strcmp("0", group)==0) {
389 SILC_LOG_DEBUG(("User and/or group configured to 0. Unacceptable"));
390 fprintf(stderr, "User and/or group configured to 0. Exiting\n");
398 fprintf(stderr, "No such user %s found\n", user);
403 fprintf(stderr, "No such group %s found\n", group);
407 /* Check whether user and/or group is set to root. If yes, exit
408 immediately. Otherwise, setgid and setuid server to user.group */
409 if (gr->gr_gid==0 || pw->pw_uid==0) {
410 fprintf(stderr, "Error:"
411 "\tSILC server must not be run as root. For the security of your\n"
412 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
413 "\tuser account. Modify the [Identity] configuration section to run\n"
414 "\tthe server as non-root user.\n");
417 /* Fork server to background, making it a daemon */
419 SILC_LOG_DEBUG(("Server started as root. Dropping privileges."));
420 SILC_LOG_DEBUG(("Forking SILC server to background"));
425 SILC_LOG_DEBUG(("Changing to group %s", group));
426 if(setgid(gr->gr_gid)==0) {
427 SILC_LOG_DEBUG(("Setgid to %s", group));
429 SILC_LOG_DEBUG(("Setgid to %s failed", group));
430 fprintf(stderr, "Tried to setgid %s but no such group. Exiting\n",
434 SILC_LOG_DEBUG(("Changing to user nobody"));
435 if(setuid(pw->pw_uid)==0) {
436 SILC_LOG_DEBUG(("Setuid to %s", user));
438 SILC_LOG_DEBUG(("Setuid to %s failed", user));
439 fprintf(stderr, "Tried to setuid %s but no such user. Exiting\n",
445 /* Fork server to background, making it a daemon */
447 SILC_LOG_DEBUG(("Server started as user"));
448 SILC_LOG_DEBUG(("Forking SILC server to background"));
455 /* Stops the SILC server. This function is used to shutdown the server.
456 This is usually called after the scheduler has returned. After stopping
457 the server one should call silc_server_free. */
459 void silc_server_stop(SilcServer server)
461 SILC_LOG_DEBUG(("Stopping server"));
463 /* Stop the scheduler, although it might be already stopped. This
464 doesn't hurt anyone. This removes all the tasks and task queues,
466 silc_schedule_stop();
467 silc_schedule_uninit();
469 silc_server_protocols_unregister();
471 SILC_LOG_DEBUG(("Server stopped"));
474 /* The heart of the server. This runs the scheduler thus runs the server.
475 When this returns the server has been stopped and the program will
478 void silc_server_run(SilcServer server)
480 SILC_LOG_DEBUG(("Running server"));
482 /* Start the scheduler, the heart of the SILC server. When this returns
483 the program will be terminated. */
487 /* Timeout callback that will be called to retry connecting to remote
488 router. This is used by both normal and router server. This will wait
489 before retrying the connecting. The timeout is generated by exponential
490 backoff algorithm. */
492 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
494 SilcServerConnection sconn = (SilcServerConnection)context;
495 SilcServer server = sconn->server;
497 SILC_LOG_INFO(("Retrying connecting to a router"));
499 /* Calculate next timeout */
500 if (sconn->retry_count >= 1) {
501 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
502 if (sconn->retry_timeout > SILC_SERVER_RETRY_INTERVAL_MAX)
503 sconn->retry_timeout = SILC_SERVER_RETRY_INTERVAL_MAX;
505 sconn->retry_timeout = server->params->retry_interval_min;
507 sconn->retry_count++;
508 sconn->retry_timeout = sconn->retry_timeout +
509 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
511 /* If we've reached max retry count, give up. */
512 if (sconn->retry_count > server->params->retry_count &&
513 server->params->retry_keep_trying == FALSE) {
514 SILC_LOG_ERROR(("Could not connect to router, giving up"));
518 /* Wait one before retrying */
519 silc_task_register(server->timeout_queue, fd, silc_server_connect_router,
520 context, sconn->retry_timeout,
521 server->params->retry_interval_min_usec,
522 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
525 /* Generic routine to use connect to a router. */
527 SILC_TASK_CALLBACK(silc_server_connect_router)
529 SilcServerConnection sconn = (SilcServerConnection)context;
530 SilcServer server = sconn->server;
531 SilcSocketConnection newsocket;
532 SilcProtocol protocol;
533 SilcServerKEInternalContext *proto_ctx;
536 /* Connect to remote host */
537 sock = silc_net_create_connection(sconn->remote_port,
540 SILC_LOG_ERROR(("Could not connect to router"));
541 silc_task_register(server->timeout_queue, fd,
542 silc_server_connect_to_router_retry,
543 context, 0, 1, SILC_TASK_TIMEOUT,
544 SILC_TASK_PRI_NORMAL);
548 /* Set socket options */
549 silc_net_set_socket_nonblock(sock);
550 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
552 /* Create socket connection for the connection. Even though we
553 know that we are connecting to a router we will mark the socket
554 to be unknown connection until we have executed authentication
556 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
557 server->sockets[sock] = newsocket;
558 newsocket->hostname = strdup(sconn->remote_host);
559 newsocket->ip = strdup(sconn->remote_host);
560 newsocket->port = sconn->remote_port;
561 sconn->sock = newsocket;
563 /* Allocate internal protocol context. This is sent as context
565 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
566 proto_ctx->server = (void *)server;
567 proto_ctx->context = (void *)sconn;
568 proto_ctx->sock = newsocket;
569 proto_ctx->rng = server->rng;
570 proto_ctx->responder = FALSE;
572 /* Perform key exchange protocol. silc_server_connect_to_router_second
573 will be called after the protocol is finished. */
574 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
575 &protocol, proto_ctx,
576 silc_server_connect_to_router_second);
577 newsocket->protocol = protocol;
579 /* Register a timeout task that will be executed if the protocol
580 is not executed within set limit. */
581 proto_ctx->timeout_task =
582 silc_task_register(server->timeout_queue, sock,
583 silc_server_timeout_remote,
584 server, server->params->protocol_timeout,
585 server->params->protocol_timeout_usec,
589 /* Register the connection for network input and output. This sets
590 that scheduler will listen for incoming packets for this connection
591 and sets that outgoing packets may be sent to this connection as
592 well. However, this doesn't set the scheduler for outgoing traffic,
593 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
594 later when outgoing data is available. */
595 context = (void *)server;
596 SILC_REGISTER_CONNECTION_FOR_IO(sock);
598 /* Run the protocol */
599 protocol->execute(server->timeout_queue, 0, protocol, sock, 0, 0);
602 /* This function connects to our primary router or if we are a router this
603 establishes all our primary routes. This is called at the start of the
604 server to do authentication and key exchange with our router - called
607 SILC_TASK_CALLBACK(silc_server_connect_to_router)
609 SilcServer server = (SilcServer)context;
610 SilcServerConnection sconn;
612 SILC_LOG_DEBUG(("Connecting to router(s)"));
614 /* If we are normal SILC server we need to connect to our cell's
616 if (server->server_type == SILC_SERVER) {
617 SILC_LOG_DEBUG(("We are normal server"));
619 /* Create connection to the router, if configured. */
620 if (server->config->routers) {
622 /* Allocate connection object for hold connection specific stuff. */
623 sconn = silc_calloc(1, sizeof(*sconn));
624 sconn->server = server;
625 sconn->remote_host = strdup(server->config->routers->host);
626 sconn->remote_port = server->config->routers->port;
628 silc_task_register(server->timeout_queue, fd,
629 silc_server_connect_router,
630 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
631 SILC_TASK_PRI_NORMAL);
636 /* If we are a SILC router we need to establish all of our primary
638 if (server->server_type == SILC_ROUTER) {
639 SilcServerConfigSectionServerConnection *ptr;
641 SILC_LOG_DEBUG(("We are router"));
643 /* Create the connections to all our routes */
644 ptr = server->config->routers;
647 SILC_LOG_DEBUG(("Router connection [%s] %s:%d",
648 ptr->initiator ? "Initiator" : "Responder",
649 ptr->host, ptr->port));
651 if (ptr->initiator) {
652 /* Allocate connection object for hold connection specific stuff. */
653 sconn = silc_calloc(1, sizeof(*sconn));
654 sconn->server = server;
655 sconn->remote_host = strdup(ptr->host);
656 sconn->remote_port = ptr->port;
658 silc_task_register(server->timeout_queue, fd,
659 silc_server_connect_router,
660 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
661 SILC_TASK_PRI_NORMAL);
671 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
673 /* There wasn't a configured router, we will continue but we don't
674 have a connection to outside world. We will be standalone server. */
675 server->standalone = TRUE;
678 /* Second part of connecting to router(s). Key exchange protocol has been
679 executed and now we will execute authentication protocol. */
681 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
683 SilcProtocol protocol = (SilcProtocol)context;
684 SilcServerKEInternalContext *ctx =
685 (SilcServerKEInternalContext *)protocol->context;
686 SilcServer server = (SilcServer)ctx->server;
687 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
688 SilcSocketConnection sock = NULL;
689 SilcServerConnAuthInternalContext *proto_ctx;
691 SILC_LOG_DEBUG(("Start"));
693 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
694 /* Error occured during protocol */
695 silc_protocol_free(protocol);
697 silc_packet_context_free(ctx->packet);
699 silc_ske_free(ctx->ske);
701 silc_free(ctx->dest_id);
704 sock->protocol = NULL;
705 silc_server_disconnect_remote(server, sock, "Server closed connection: "
706 "Key exchange failed");
710 /* Allocate internal context for the authentication protocol. This
711 is sent as context for the protocol. */
712 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
713 proto_ctx->server = (void *)server;
714 proto_ctx->context = (void *)sconn;
715 proto_ctx->sock = sock = server->sockets[fd];
716 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
717 proto_ctx->dest_id_type = ctx->dest_id_type;
718 proto_ctx->dest_id = ctx->dest_id;
720 /* Resolve the authentication method used in this connection */
721 proto_ctx->auth_meth = SILC_AUTH_PASSWORD;
722 if (server->config->routers) {
723 SilcServerConfigSectionServerConnection *conn = NULL;
725 /* Check if we find a match from user configured connections */
726 conn = silc_server_config_find_router_conn(server->config,
730 /* Match found. Use the configured authentication method */
731 proto_ctx->auth_meth = conn->auth_meth;
732 if (conn->auth_data) {
733 proto_ctx->auth_data = strdup(conn->auth_data);
734 proto_ctx->auth_data_len = strlen(conn->auth_data);
737 /* No match found. */
744 /* Free old protocol as it is finished now */
745 silc_protocol_free(protocol);
747 silc_packet_context_free(ctx->packet);
749 sock->protocol = NULL;
751 /* Allocate the authentication protocol. This is allocated here
752 but we won't start it yet. We will be receiving party of this
753 protocol thus we will wait that connecting party will make
755 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
756 &sock->protocol, proto_ctx,
757 silc_server_connect_to_router_final);
759 /* Register timeout task. If the protocol is not executed inside
760 this timelimit the connection will be terminated. Currently
761 this is 15 seconds and is hard coded limit (XXX). */
762 proto_ctx->timeout_task =
763 silc_task_register(server->timeout_queue, sock->sock,
764 silc_server_timeout_remote,
765 (void *)server, 15, 0,
769 /* Run the protocol */
770 sock->protocol->execute(server->timeout_queue, 0,
771 sock->protocol, sock->sock, 0, 0);
774 /* Finalizes the connection to router. Registers a server task to the
775 queue so that we can accept new connections. */
777 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
779 SilcProtocol protocol = (SilcProtocol)context;
780 SilcServerConnAuthInternalContext *ctx =
781 (SilcServerConnAuthInternalContext *)protocol->context;
782 SilcServer server = (SilcServer)ctx->server;
783 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
784 SilcSocketConnection sock = ctx->sock;
785 SilcServerEntry id_entry;
787 SilcServerHBContext hb_context;
788 unsigned char *id_string;
790 SILC_LOG_DEBUG(("Start"));
792 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
793 /* Error occured during protocol */
795 silc_free(ctx->dest_id);
796 silc_server_disconnect_remote(server, sock, "Server closed connection: "
797 "Authentication failed");
801 /* Add a task to the queue. This task receives new connections to the
802 server. This task remains on the queue until the end of the program. */
803 if (!server->listenning) {
804 silc_task_register(server->io_queue, server->sock,
805 silc_server_accept_new_connection,
806 (void *)server, 0, 0,
808 SILC_TASK_PRI_NORMAL);
809 server->listenning = TRUE;
812 /* Send NEW_SERVER packet to the router. We will become registered
813 to the SILC network after sending this packet. */
814 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
815 packet = silc_buffer_alloc(2 + 2 + SILC_ID_SERVER_LEN +
816 strlen(server->server_name));
817 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
818 silc_buffer_format(packet,
819 SILC_STR_UI_SHORT(SILC_ID_SERVER_LEN),
820 SILC_STR_UI_XNSTRING(id_string, SILC_ID_SERVER_LEN),
821 SILC_STR_UI_SHORT(strlen(server->server_name)),
822 SILC_STR_UI_XNSTRING(server->server_name,
823 strlen(server->server_name)),
826 /* Send the packet */
827 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
828 packet->data, packet->len, TRUE);
829 silc_buffer_free(packet);
830 silc_free(id_string);
832 SILC_LOG_DEBUG(("Connected to router %s", sock->hostname));
834 /* Add the connected router to local server list */
835 server->standalone = FALSE;
836 id_entry = silc_idlist_add_server(server->local_list, sock->hostname,
837 SILC_ROUTER, ctx->dest_id, NULL, sock);
840 silc_free(ctx->dest_id);
841 silc_server_disconnect_remote(server, sock, "Server closed connection: "
842 "Authentication failed");
846 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
847 silc_free(sock->user_data);
848 sock->user_data = (void *)id_entry;
849 sock->type = SILC_SOCKET_TYPE_ROUTER;
850 server->id_entry->router = id_entry;
851 server->router = id_entry;
852 server->router->data.registered = TRUE;
854 /* Perform keepalive. The `hb_context' will be freed automatically
855 when finally calling the silc_socket_free function. XXX hardcoded
857 hb_context = silc_calloc(1, sizeof(*hb_context));
858 hb_context->server = server;
859 silc_socket_set_heartbeat(sock, 600, hb_context,
860 silc_server_perform_heartbeat,
861 server->timeout_queue);
863 /* If we are router then announce our possible servers. */
864 if (server->server_type == SILC_ROUTER)
865 silc_server_announce_servers(server);
867 /* Announce our clients and channels to the router */
868 silc_server_announce_clients(server);
869 silc_server_announce_channels(server);
872 /* Free the temporary connection data context */
874 silc_free(sconn->remote_host);
878 /* Free the protocol object */
879 silc_protocol_free(protocol);
881 silc_packet_context_free(ctx->packet);
883 silc_ske_free(ctx->ske);
885 sock->protocol = NULL;
888 /* Accepts new connections to the server. Accepting new connections are
889 done in three parts to make it async. */
891 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
893 SilcServer server = (SilcServer)context;
894 SilcSocketConnection newsocket;
895 SilcServerKEInternalContext *proto_ctx;
898 SILC_LOG_DEBUG(("Accepting new connection"));
900 server->stat.conn_attempts++;
902 sock = silc_net_accept_connection(server->sock);
904 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
905 server->stat.conn_failures++;
909 /* Check max connections */
910 if (sock > SILC_SERVER_MAX_CONNECTIONS) {
911 if (server->config->redirect) {
912 /* XXX Redirecting connection to somewhere else now?? */
913 /*silc_server_send_notify("Server is full, trying to redirect..."); */
915 SILC_LOG_ERROR(("Refusing connection, server is full"));
916 server->stat.conn_failures++;
921 /* Set socket options */
922 silc_net_set_socket_nonblock(sock);
923 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
925 /* We don't create a ID yet, since we don't know what type of connection
926 this is yet. But, we do add the connection to the socket table. */
927 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
928 server->sockets[sock] = newsocket;
930 /* XXX This MUST be done async as this will block the entire server
931 process. Either we have to do our own resolver stuff or in the future
932 we can use threads. */
933 /* Perform name and address lookups for the remote host. */
934 silc_net_check_host_by_sock(sock, &newsocket->hostname, &newsocket->ip);
935 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
937 SILC_LOG_ERROR(("IP/DNS lookup failed"));
938 server->stat.conn_failures++;
941 if (!newsocket->hostname)
942 newsocket->hostname = strdup(newsocket->ip);
943 newsocket->port = silc_net_get_remote_port(sock);
945 SILC_LOG_INFO(("Incoming connection from %s (%s)", newsocket->hostname,
948 /* Allocate internal context for key exchange protocol. This is
949 sent as context for the protocol. */
950 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
951 proto_ctx->server = context;
952 proto_ctx->sock = newsocket;
953 proto_ctx->rng = server->rng;
954 proto_ctx->responder = TRUE;
956 /* Prepare the connection for key exchange protocol. We allocate the
957 protocol but will not start it yet. The connector will be the
958 initiator of the protocol thus we will wait for initiation from
959 there before we start the protocol. */
960 server->stat.auth_attempts++;
961 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
962 &newsocket->protocol, proto_ctx,
963 silc_server_accept_new_connection_second);
965 /* Register a timeout task that will be executed if the connector
966 will not start the key exchange protocol within 60 seconds. For
967 now, this is a hard coded limit. After 60 secs the connection will
968 be closed if the key exchange protocol has not been started. */
969 proto_ctx->timeout_task =
970 silc_task_register(server->timeout_queue, newsocket->sock,
971 silc_server_timeout_remote,
976 /* Register the connection for network input and output. This sets
977 that scheduler will listen for incoming packets for this connection
978 and sets that outgoing packets may be sent to this connection as well.
979 However, this doesn't set the scheduler for outgoing traffic, it
980 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
981 later when outgoing data is available. */
982 SILC_REGISTER_CONNECTION_FOR_IO(sock);
985 /* Second part of accepting new connection. Key exchange protocol has been
986 performed and now it is time to do little connection authentication
987 protocol to figure out whether this connection is client or server
988 and whether it has right to access this server (especially server
989 connections needs to be authenticated). */
991 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
993 SilcProtocol protocol = (SilcProtocol)context;
994 SilcServerKEInternalContext *ctx =
995 (SilcServerKEInternalContext *)protocol->context;
996 SilcServer server = (SilcServer)ctx->server;
997 SilcSocketConnection sock = NULL;
998 SilcServerConnAuthInternalContext *proto_ctx;
1000 SILC_LOG_DEBUG(("Start"));
1002 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
1003 /* Error occured during protocol */
1004 silc_protocol_free(protocol);
1006 silc_packet_context_free(ctx->packet);
1008 silc_ske_free(ctx->ske);
1010 silc_free(ctx->dest_id);
1013 sock->protocol = NULL;
1014 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1015 "Key exchange failed");
1016 server->stat.auth_failures++;
1020 /* Allocate internal context for the authentication protocol. This
1021 is sent as context for the protocol. */
1022 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1023 proto_ctx->server = (void *)server;
1024 proto_ctx->sock = sock = server->sockets[fd];
1025 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
1026 proto_ctx->responder = TRUE;
1027 proto_ctx->dest_id_type = ctx->dest_id_type;
1028 proto_ctx->dest_id = ctx->dest_id;
1030 /* Free old protocol as it is finished now */
1031 silc_protocol_free(protocol);
1033 silc_packet_context_free(ctx->packet);
1035 sock->protocol = NULL;
1037 /* Allocate the authentication protocol. This is allocated here
1038 but we won't start it yet. We will be receiving party of this
1039 protocol thus we will wait that connecting party will make
1040 their first move. */
1041 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1042 &sock->protocol, proto_ctx,
1043 silc_server_accept_new_connection_final);
1045 /* Register timeout task. If the protocol is not executed inside
1046 this timelimit the connection will be terminated. Currently
1047 this is 60 seconds and is hard coded limit (XXX). */
1048 proto_ctx->timeout_task =
1049 silc_task_register(server->timeout_queue, sock->sock,
1050 silc_server_timeout_remote,
1051 (void *)server, 60, 0,
1056 /* Final part of accepting new connection. The connection has now
1057 been authenticated and keys has been exchanged. We also know whether
1058 this is client or server connection. */
1060 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1062 SilcProtocol protocol = (SilcProtocol)context;
1063 SilcServerConnAuthInternalContext *ctx =
1064 (SilcServerConnAuthInternalContext *)protocol->context;
1065 SilcServer server = (SilcServer)ctx->server;
1066 SilcSocketConnection sock = ctx->sock;
1067 SilcServerHBContext hb_context;
1068 void *id_entry = NULL;
1070 SILC_LOG_DEBUG(("Start"));
1072 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
1073 /* Error occured during protocol */
1074 silc_protocol_free(protocol);
1076 silc_packet_context_free(ctx->packet);
1078 silc_ske_free(ctx->ske);
1080 silc_free(ctx->dest_id);
1083 sock->protocol = NULL;
1084 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1085 "Authentication failed");
1086 server->stat.auth_failures++;
1090 sock->type = ctx->conn_type;
1091 switch(sock->type) {
1092 case SILC_SOCKET_TYPE_CLIENT:
1094 SilcClientEntry client;
1096 SILC_LOG_DEBUG(("Remote host is client"));
1097 SILC_LOG_INFO(("Connection from %s (%s) is client", sock->hostname,
1100 /* Add the client to the client ID cache. The nickname and Client ID
1101 and other information is created after we have received NEW_CLIENT
1102 packet from client. */
1103 client = silc_idlist_add_client(server->local_list,
1104 NULL, NULL, NULL, NULL, NULL, sock);
1106 SILC_LOG_ERROR(("Could not add new client to cache"));
1107 silc_free(sock->user_data);
1112 server->stat.my_clients++;
1113 server->stat.clients++;
1114 if (server->server_type == SILC_ROUTER)
1115 server->stat.cell_clients++;
1117 id_entry = (void *)client;
1120 case SILC_SOCKET_TYPE_SERVER:
1121 case SILC_SOCKET_TYPE_ROUTER:
1123 SilcServerEntry new_server;
1125 SILC_LOG_DEBUG(("Remote host is %s",
1126 sock->type == SILC_SOCKET_TYPE_SERVER ?
1127 "server" : "router"));
1128 SILC_LOG_INFO(("Connection from %s (%s) is %s", sock->hostname,
1129 sock->ip, sock->type == SILC_SOCKET_TYPE_SERVER ?
1130 "server" : "router"));
1132 /* Add the server into server cache. The server name and Server ID
1133 is updated after we have received NEW_SERVER packet from the
1134 server. We mark ourselves as router for this server if we really
1137 silc_idlist_add_server(server->local_list, NULL,
1138 sock->type == SILC_SOCKET_TYPE_SERVER ?
1139 SILC_SERVER : SILC_ROUTER, NULL,
1140 sock->type == SILC_SOCKET_TYPE_SERVER ?
1141 server->id_entry : NULL, sock);
1143 SILC_LOG_ERROR(("Could not add new server to cache"));
1144 silc_free(sock->user_data);
1149 if (sock->type == SILC_SOCKET_TYPE_SERVER)
1150 server->stat.my_servers++;
1152 server->stat.my_routers++;
1153 server->stat.servers++;
1155 id_entry = (void *)new_server;
1157 /* There is connection to other server now, if it is router then
1158 we will have connection to outside world. If we are router but
1159 normal server connected to us then we will remain standalone,
1160 if we are standlone. */
1161 if (server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER) {
1162 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1163 server->standalone = FALSE;
1164 if (!server->id_entry->router) {
1165 server->id_entry->router = id_entry;
1166 server->router = id_entry;
1175 /* Add the common data structure to the ID entry. */
1177 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1179 /* Add to sockets internal pointer for fast referencing */
1180 silc_free(sock->user_data);
1181 sock->user_data = id_entry;
1183 /* Connection has been fully established now. Everything is ok. */
1184 SILC_LOG_DEBUG(("New connection authenticated"));
1186 /* Perform keepalive. The `hb_context' will be freed automatically
1187 when finally calling the silc_socket_free function. XXX hardcoded
1189 hb_context = silc_calloc(1, sizeof(*hb_context));
1190 hb_context->server = server;
1191 silc_socket_set_heartbeat(sock, 600, hb_context,
1192 silc_server_perform_heartbeat,
1193 server->timeout_queue);
1195 silc_protocol_free(protocol);
1197 silc_packet_context_free(ctx->packet);
1199 silc_ske_free(ctx->ske);
1201 silc_free(ctx->dest_id);
1203 sock->protocol = NULL;
1206 /* This function is used to read packets from network and send packets to
1207 network. This is usually a generic task. */
1209 SILC_TASK_CALLBACK(silc_server_packet_process)
1211 SilcServer server = (SilcServer)context;
1212 SilcSocketConnection sock = server->sockets[fd];
1213 SilcIDListData idata;
1214 SilcCipher cipher = NULL;
1215 SilcHmac hmac = NULL;
1221 SILC_LOG_DEBUG(("Processing packet"));
1223 /* Packet sending */
1225 if (type == SILC_TASK_WRITE) {
1226 /* Do not send data to disconnected connection */
1227 if (SILC_IS_DISCONNECTED(sock))
1230 server->stat.packets_sent++;
1232 if (sock->outbuf->data - sock->outbuf->head)
1233 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1235 ret = silc_server_packet_send_real(server, sock, TRUE);
1237 /* If returned -2 could not write to connection now, will do
1245 /* The packet has been sent and now it is time to set the connection
1246 back to only for input. When there is again some outgoing data
1247 available for this connection it will be set for output as well.
1248 This call clears the output setting and sets it only for input. */
1249 SILC_SET_CONNECTION_FOR_INPUT(fd);
1250 SILC_UNSET_OUTBUF_PENDING(sock);
1252 silc_buffer_clear(sock->outbuf);
1256 /* Packet receiving */
1258 /* Read some data from connection */
1259 ret = silc_packet_receive(sock);
1265 SILC_LOG_DEBUG(("Read EOF"));
1267 /* If connection is disconnecting already we will finally
1268 close the connection */
1269 if (SILC_IS_DISCONNECTING(sock)) {
1270 if (sock->user_data)
1271 silc_server_free_sock_user_data(server, sock);
1272 silc_server_close_connection(server, sock);
1276 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1277 SILC_SET_DISCONNECTING(sock);
1279 /* If the closed connection was our primary router connection the
1280 start re-connecting phase. */
1281 if (!server->standalone && server->server_type == SILC_SERVER &&
1282 sock == server->router->connection)
1283 silc_task_register(server->timeout_queue, 0,
1284 silc_server_connect_to_router,
1287 SILC_TASK_PRI_NORMAL);
1289 if (sock->user_data)
1290 silc_server_free_sock_user_data(server, sock);
1291 silc_server_close_connection(server, sock);
1295 /* If connection is disconnecting or disconnected we will ignore
1297 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1298 SILC_LOG_DEBUG(("Ignoring read data from disonnected connection"));
1302 server->stat.packets_received++;
1304 /* Get keys and stuff from ID entry */
1305 idata = (SilcIDListData)sock->user_data;
1307 idata->last_receive = time(NULL);
1308 cipher = idata->receive_key;
1312 /* Process the packet. This will call the parser that will then
1313 decrypt and parse the packet. */
1314 silc_packet_receive_process(sock, cipher, hmac, silc_server_packet_parse,
1318 /* Parses whole packet, received earlier. */
1320 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1322 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1323 SilcServer server = (SilcServer)parse_ctx->context;
1324 SilcSocketConnection sock = parse_ctx->sock;
1325 SilcPacketContext *packet = parse_ctx->packet;
1328 SILC_LOG_DEBUG(("Start"));
1330 /* Decrypt the received packet */
1331 ret = silc_packet_decrypt(parse_ctx->cipher, parse_ctx->hmac,
1332 packet->buffer, packet);
1337 /* Parse the packet. Packet type is returned. */
1338 ret = silc_packet_parse(packet);
1340 /* Parse the packet header in special way as this is "special"
1342 ret = silc_packet_parse_special(packet);
1345 if (ret == SILC_PACKET_NONE)
1348 if (server->server_type == SILC_ROUTER) {
1349 /* Route the packet if it is not destined to us. Other ID types but
1350 server are handled separately after processing them. */
1351 if (packet->dst_id_type == SILC_ID_SERVER &&
1352 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1353 SILC_ID_SERVER_COMPARE(packet->dst_id, server->id_string)) {
1355 /* Route the packet to fastest route for the destination ID */
1356 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
1357 packet->dst_id_type);
1360 silc_server_packet_route(server,
1361 silc_server_route_get(server, id,
1362 packet->dst_id_type),
1368 /* Broadcast packet if it is marked as broadcast packet and it is
1369 originated from router and we are router. */
1370 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1371 packet->flags & SILC_PACKET_FLAG_BROADCAST) {
1372 silc_server_packet_broadcast(server, server->router->connection, packet);
1376 /* Parse the incoming packet type */
1377 silc_server_packet_parse_type(server, sock, packet);
1380 silc_buffer_clear(sock->inbuf);
1381 silc_packet_context_free(packet);
1382 silc_free(parse_ctx);
1385 /* Parser callback called by silc_packet_receive_process. This merely
1386 registers timeout that will handle the actual parsing when appropriate. */
1388 void silc_server_packet_parse(SilcPacketParserContext *parser_context)
1390 SilcServer server = (SilcServer)parser_context->context;
1391 SilcSocketConnection sock = parser_context->sock;
1393 switch (sock->type) {
1394 case SILC_SOCKET_TYPE_CLIENT:
1395 case SILC_SOCKET_TYPE_UNKNOWN:
1396 /* Parse the packet with timeout */
1397 silc_task_register(server->timeout_queue, sock->sock,
1398 silc_server_packet_parse_real,
1399 (void *)parser_context, 0, 100000,
1401 SILC_TASK_PRI_NORMAL);
1403 case SILC_SOCKET_TYPE_SERVER:
1404 case SILC_SOCKET_TYPE_ROUTER:
1405 /* Packets from servers are parsed as soon as possible */
1406 silc_task_register(server->timeout_queue, sock->sock,
1407 silc_server_packet_parse_real,
1408 (void *)parser_context, 0, 1,
1410 SILC_TASK_PRI_NORMAL);
1417 /* Parses the packet type and calls what ever routines the packet type
1418 requires. This is done for all incoming packets. */
1420 void silc_server_packet_parse_type(SilcServer server,
1421 SilcSocketConnection sock,
1422 SilcPacketContext *packet)
1424 SilcPacketType type = packet->type;
1426 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1428 /* Parse the packet type */
1430 case SILC_PACKET_DISCONNECT:
1431 SILC_LOG_DEBUG(("Disconnect packet"));
1432 if (packet->flags & SILC_PACKET_FLAG_LIST)
1436 case SILC_PACKET_SUCCESS:
1438 * Success received for something. For now we can have only
1439 * one protocol for connection executing at once hence this
1440 * success message is for whatever protocol is executing currently.
1442 SILC_LOG_DEBUG(("Success packet"));
1443 if (packet->flags & SILC_PACKET_FLAG_LIST)
1445 if (sock->protocol) {
1446 sock->protocol->execute(server->timeout_queue, 0,
1447 sock->protocol, sock->sock, 0, 0);
1451 case SILC_PACKET_FAILURE:
1453 * Failure received for something. For now we can have only
1454 * one protocol for connection executing at once hence this
1455 * failure message is for whatever protocol is executing currently.
1457 SILC_LOG_DEBUG(("Failure packet"));
1458 if (packet->flags & SILC_PACKET_FLAG_LIST)
1460 if (sock->protocol) {
1461 /* XXX Audit the failure type */
1462 sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
1463 sock->protocol->execute(server->timeout_queue, 0,
1464 sock->protocol, sock->sock, 0, 0);
1468 case SILC_PACKET_REJECT:
1469 SILC_LOG_DEBUG(("Reject packet"));
1470 if (packet->flags & SILC_PACKET_FLAG_LIST)
1475 case SILC_PACKET_NOTIFY:
1477 * Received notify packet. Server can receive notify packets from
1478 * router. Server then relays the notify messages to clients if needed.
1480 SILC_LOG_DEBUG(("Notify packet"));
1481 if (packet->flags & SILC_PACKET_FLAG_LIST)
1482 silc_server_notify_list(server, sock, packet);
1484 silc_server_notify(server, sock, packet);
1490 case SILC_PACKET_CHANNEL_MESSAGE:
1492 * Received channel message. Channel messages are special packets
1493 * (although probably most common ones) thus they are handled
1496 SILC_LOG_DEBUG(("Channel Message packet"));
1497 if (packet->flags & SILC_PACKET_FLAG_LIST)
1499 silc_server_channel_message(server, sock, packet);
1502 case SILC_PACKET_CHANNEL_KEY:
1504 * Received key for channel. As channels are created by the router
1505 * the keys are as well. We will distribute the key to all of our
1506 * locally connected clients on the particular channel. Router
1507 * never receives this channel and thus is ignored.
1509 SILC_LOG_DEBUG(("Channel Key packet"));
1510 if (packet->flags & SILC_PACKET_FLAG_LIST)
1512 silc_server_channel_key(server, sock, packet);
1518 case SILC_PACKET_COMMAND:
1520 * Recived command. Processes the command request and allocates the
1521 * command context and calls the command.
1523 SILC_LOG_DEBUG(("Command packet"));
1524 if (packet->flags & SILC_PACKET_FLAG_LIST)
1526 silc_server_command_process(server, sock, packet);
1529 case SILC_PACKET_COMMAND_REPLY:
1531 * Received command reply packet. Received command reply to command. It
1532 * may be reply to command sent by us or reply to command sent by client
1533 * that we've routed further.
1535 SILC_LOG_DEBUG(("Command Reply packet"));
1536 if (packet->flags & SILC_PACKET_FLAG_LIST)
1538 silc_server_command_reply(server, sock, packet);
1542 * Private Message packets
1544 case SILC_PACKET_PRIVATE_MESSAGE:
1546 * Received private message packet. The packet is coming from either
1549 SILC_LOG_DEBUG(("Private Message packet"));
1550 if (packet->flags & SILC_PACKET_FLAG_LIST)
1552 silc_server_private_message(server, sock, packet);
1555 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1557 * Private message key packet.
1559 if (packet->flags & SILC_PACKET_FLAG_LIST)
1564 * Key Exchange protocol packets
1566 case SILC_PACKET_KEY_EXCHANGE:
1567 SILC_LOG_DEBUG(("KE packet"));
1568 if (packet->flags & SILC_PACKET_FLAG_LIST)
1571 if (sock->protocol && sock->protocol->protocol->type
1572 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1574 SilcServerKEInternalContext *proto_ctx =
1575 (SilcServerKEInternalContext *)sock->protocol->context;
1577 proto_ctx->packet = silc_packet_context_dup(packet);
1579 /* Let the protocol handle the packet */
1580 sock->protocol->execute(server->timeout_queue, 0,
1581 sock->protocol, sock->sock, 0, 100000);
1583 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1584 "protocol active, packet dropped."));
1586 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1590 case SILC_PACKET_KEY_EXCHANGE_1:
1591 SILC_LOG_DEBUG(("KE 1 packet"));
1592 if (packet->flags & SILC_PACKET_FLAG_LIST)
1595 if (sock->protocol && sock->protocol->protocol->type
1596 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1598 SilcServerKEInternalContext *proto_ctx =
1599 (SilcServerKEInternalContext *)sock->protocol->context;
1601 if (proto_ctx->packet)
1602 silc_packet_context_free(proto_ctx->packet);
1604 proto_ctx->packet = silc_packet_context_dup(packet);
1605 proto_ctx->dest_id_type = packet->src_id_type;
1606 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1607 packet->src_id_type);
1608 if (!proto_ctx->dest_id)
1611 /* Let the protocol handle the packet */
1612 sock->protocol->execute(server->timeout_queue, 0,
1613 sock->protocol, sock->sock,
1616 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1617 "protocol active, packet dropped."));
1621 case SILC_PACKET_KEY_EXCHANGE_2:
1622 SILC_LOG_DEBUG(("KE 2 packet"));
1623 if (packet->flags & SILC_PACKET_FLAG_LIST)
1626 if (sock->protocol && sock->protocol->protocol->type
1627 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1629 SilcServerKEInternalContext *proto_ctx =
1630 (SilcServerKEInternalContext *)sock->protocol->context;
1632 if (proto_ctx->packet)
1633 silc_packet_context_free(proto_ctx->packet);
1635 proto_ctx->packet = silc_packet_context_dup(packet);
1636 proto_ctx->dest_id_type = packet->src_id_type;
1637 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1638 packet->src_id_type);
1639 if (!proto_ctx->dest_id)
1642 /* Let the protocol handle the packet */
1643 sock->protocol->execute(server->timeout_queue, 0,
1644 sock->protocol, sock->sock,
1647 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
1648 "protocol active, packet dropped."));
1652 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
1654 * Connection authentication request packet. When we receive this packet
1655 * we will send to the other end information about our mandatory
1656 * authentication method for the connection. This packet maybe received
1659 SILC_LOG_DEBUG(("Connection authentication request packet"));
1660 if (packet->flags & SILC_PACKET_FLAG_LIST)
1665 * Connection Authentication protocol packets
1667 case SILC_PACKET_CONNECTION_AUTH:
1668 /* Start of the authentication protocol. We receive here the
1669 authentication data and will verify it. */
1670 SILC_LOG_DEBUG(("Connection auth packet"));
1671 if (packet->flags & SILC_PACKET_FLAG_LIST)
1674 if (sock->protocol && sock->protocol->protocol->type
1675 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
1677 SilcServerConnAuthInternalContext *proto_ctx =
1678 (SilcServerConnAuthInternalContext *)sock->protocol->context;
1680 proto_ctx->packet = silc_packet_context_dup(packet);
1682 /* Let the protocol handle the packet */
1683 sock->protocol->execute(server->timeout_queue, 0,
1684 sock->protocol, sock->sock, 0, 0);
1686 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1687 "protocol active, packet dropped."));
1691 case SILC_PACKET_NEW_ID:
1693 * Received New ID packet. This includes some new ID that has been
1694 * created. It may be for client, server or channel. This is the way
1695 * to distribute information about new registered entities in the
1698 SILC_LOG_DEBUG(("New ID packet"));
1699 if (packet->flags & SILC_PACKET_FLAG_LIST)
1700 silc_server_new_id_list(server, sock, packet);
1702 silc_server_new_id(server, sock, packet);
1705 case SILC_PACKET_NEW_CLIENT:
1707 * Received new client packet. This includes client information that
1708 * we will use to create initial client ID. After creating new
1709 * ID we will send it to the client.
1711 SILC_LOG_DEBUG(("New Client packet"));
1712 if (packet->flags & SILC_PACKET_FLAG_LIST)
1714 silc_server_new_client(server, sock, packet);
1717 case SILC_PACKET_NEW_SERVER:
1719 * Received new server packet. This includes Server ID and some other
1720 * information that we may save. This is received after server has
1723 SILC_LOG_DEBUG(("New Server packet"));
1724 if (packet->flags & SILC_PACKET_FLAG_LIST)
1726 silc_server_new_server(server, sock, packet);
1729 case SILC_PACKET_NEW_CHANNEL:
1731 * Received new channel packet. Information about new channel in the
1732 * network are distributed using this packet.
1734 SILC_LOG_DEBUG(("New Channel packet"));
1735 if (packet->flags & SILC_PACKET_FLAG_LIST)
1736 silc_server_new_channel_list(server, sock, packet);
1738 silc_server_new_channel(server, sock, packet);
1741 case SILC_PACKET_HEARTBEAT:
1743 * Received heartbeat.
1745 SILC_LOG_DEBUG(("Heartbeat packet"));
1746 if (packet->flags & SILC_PACKET_FLAG_LIST)
1751 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
1757 /* Creates connection to a remote router. */
1759 void silc_server_create_connection(SilcServer server,
1760 char *remote_host, unsigned int port)
1762 SilcServerConnection sconn;
1764 /* Allocate connection object for hold connection specific stuff. */
1765 sconn = silc_calloc(1, sizeof(*sconn));
1766 sconn->server = server;
1767 sconn->remote_host = strdup(remote_host);
1768 sconn->remote_port = port;
1770 silc_task_register(server->timeout_queue, 0,
1771 silc_server_connect_router,
1772 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
1773 SILC_TASK_PRI_NORMAL);
1776 /* Closes connection to socket connection */
1778 void silc_server_close_connection(SilcServer server,
1779 SilcSocketConnection sock)
1781 SILC_LOG_DEBUG(("Closing connection %d", sock->sock));
1783 /* We won't listen for this connection anymore */
1784 silc_schedule_unset_listen_fd(sock->sock);
1786 /* Unregister all tasks */
1787 silc_task_unregister_by_fd(server->io_queue, sock->sock);
1788 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
1790 /* Close the actual connection */
1791 silc_net_close_connection(sock->sock);
1792 server->sockets[sock->sock] = NULL;
1793 silc_socket_free(sock);
1796 /* Sends disconnect message to remote connection and disconnects the
1799 void silc_server_disconnect_remote(SilcServer server,
1800 SilcSocketConnection sock,
1801 const char *fmt, ...)
1804 unsigned char buf[4096];
1809 memset(buf, 0, sizeof(buf));
1811 vsprintf(buf, fmt, ap);
1814 SILC_LOG_DEBUG(("Disconnecting remote host"));
1816 SILC_LOG_INFO(("Disconnecting %s:%d [%s]", sock->hostname,
1818 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
1819 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
1820 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
1823 /* Notify remote end that the conversation is over. The notify message
1824 is tried to be sent immediately. */
1825 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
1826 buf, strlen(buf), TRUE);
1828 /* Mark the connection to be disconnected */
1829 SILC_SET_DISCONNECTED(sock);
1830 silc_server_close_connection(server, sock);
1833 /* Frees client data and notifies about client's signoff. */
1835 void silc_server_free_client_data(SilcServer server,
1836 SilcSocketConnection sock,
1837 SilcClientEntry user_data, char *signoff)
1839 /* Send REMOVE_ID packet to routers. */
1840 if (!server->standalone && server->router)
1841 silc_server_send_notify_signoff(server, server->router->connection,
1842 server->server_type == SILC_SERVER ?
1843 FALSE : TRUE, user_data->id,
1844 SILC_ID_CLIENT_LEN, signoff);
1846 /* Remove client from all channels */
1847 silc_server_remove_from_channels(server, sock, user_data, signoff);
1849 /* XXX must take some info to history before freeing */
1851 /* Free the client entry and everything in it */
1852 silc_idlist_del_data(user_data);
1853 silc_idlist_del_client(server->local_list, user_data);
1854 server->stat.my_clients--;
1855 server->stat.clients--;
1856 if (server->server_type == SILC_ROUTER)
1857 server->stat.cell_clients--;
1860 /* Frees user_data pointer from socket connection object. This also sends
1861 appropriate notify packets to the network to inform about leaving
1864 void silc_server_free_sock_user_data(SilcServer server,
1865 SilcSocketConnection sock)
1867 SILC_LOG_DEBUG(("Start"));
1869 switch(sock->type) {
1870 case SILC_SOCKET_TYPE_CLIENT:
1872 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
1873 silc_server_free_client_data(server, sock, user_data, NULL);
1876 case SILC_SOCKET_TYPE_SERVER:
1877 case SILC_SOCKET_TYPE_ROUTER:
1879 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
1881 /* Send REMOVE_ID packet to routers. */
1882 if (!server->standalone && server->router)
1883 silc_server_send_notify_server_signoff(server,
1884 server->router->connection,
1885 server->server_type ==
1887 FALSE : TRUE, user_data->id,
1888 SILC_ID_SERVER_LEN);
1890 /* Then also free all client entries that this server owns as
1891 they will become invalid now as well. */
1892 silc_server_remove_clients_by_server(server, user_data);
1894 /* If this was our primary router connection then we're lost to
1895 the outside world. */
1896 if (server->server_type == SILC_SERVER && server->router == user_data) {
1897 server->id_entry->router = NULL;
1898 server->router = NULL;
1899 server->standalone = TRUE;
1902 /* Free the server entry */
1903 silc_idlist_del_data(user_data);
1904 silc_idlist_del_server(server->local_list, user_data);
1905 server->stat.my_servers--;
1906 server->stat.servers--;
1907 if (server->server_type == SILC_ROUTER)
1908 server->stat.cell_servers--;
1913 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
1915 silc_idlist_del_data(user_data);
1916 silc_free(user_data);
1921 sock->user_data = NULL;
1924 /* This function is used to remove all client entries by the server `entry'.
1925 This is called when the connection is lost to the server. In this case
1926 we must invalidate all the client entries owned by the server `entry'. */
1928 int silc_server_remove_clients_by_server(SilcServer server,
1929 SilcServerEntry entry)
1931 SilcIDCacheList list = NULL;
1932 SilcIDCacheEntry id_cache = NULL;
1933 SilcClientEntry client = NULL;
1935 SILC_LOG_DEBUG(("Start"));
1937 if (silc_idcache_find_by_id(server->local_list->clients,
1938 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
1940 if (silc_idcache_list_first(list, &id_cache)) {
1942 client = (SilcClientEntry)id_cache->context;
1944 if (client->router != entry) {
1945 if (!silc_idcache_list_next(list, &id_cache))
1951 /* Remove the client entry */
1952 silc_server_remove_from_channels(server, NULL, client, NULL);
1953 silc_idlist_del_client(server->local_list, client);
1955 if (!silc_idcache_list_next(list, &id_cache))
1959 silc_idcache_list_free(list);
1962 if (silc_idcache_find_by_id(server->global_list->clients,
1963 SILC_ID_CACHE_ANY, SILC_ID_CLIENT, &list)) {
1965 if (silc_idcache_list_first(list, &id_cache)) {
1967 client = (SilcClientEntry)id_cache->context;
1969 if (client->router != entry) {
1970 if (!silc_idcache_list_next(list, &id_cache))
1976 /* Remove the client entry */
1977 silc_server_remove_from_channels(server, NULL, client, NULL);
1978 silc_idlist_del_client(server->global_list, client);
1980 if (!silc_idcache_list_next(list, &id_cache))
1984 silc_idcache_list_free(list);
1990 /* Checks whether given channel has global users. If it does this returns
1991 TRUE and FALSE if there is only locally connected clients on the channel. */
1993 int silc_server_channel_has_global(SilcChannelEntry channel)
1995 SilcChannelClientEntry chl;
1997 silc_list_start(channel->user_list);
1998 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
1999 if (chl->client->router)
2006 /* Checks whether given channel has locally connected users. If it does this
2007 returns TRUE and FALSE if there is not one locally connected client. */
2009 int silc_server_channel_has_local(SilcChannelEntry channel)
2011 SilcChannelClientEntry chl;
2013 silc_list_start(channel->user_list);
2014 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2015 if (!chl->client->router)
2022 /* Removes client from all channels it has joined. This is used when client
2023 connection is disconnected. If the client on a channel is last, the
2024 channel is removed as well. This sends the SIGNOFF notify types. */
2026 void silc_server_remove_from_channels(SilcServer server,
2027 SilcSocketConnection sock,
2028 SilcClientEntry client,
2029 char *signoff_message)
2031 SilcChannelEntry channel;
2032 SilcChannelClientEntry chl;
2035 SILC_LOG_DEBUG(("Start"));
2037 if (!client || !client->id)
2040 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2042 /* Remove the client from all channels. The client is removed from
2043 the channels' user list. */
2044 silc_list_start(client->channels);
2045 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2046 channel = chl->channel;
2048 /* Remove channel from client's channel list */
2049 silc_list_del(client->channels, chl);
2051 /* Remove channel if there is no users anymore */
2052 if (server->server_type == SILC_ROUTER &&
2053 silc_list_count(channel->user_list) < 2) {
2054 if (!silc_idlist_del_channel(server->local_list, channel))
2055 silc_idlist_del_channel(server->global_list, channel);
2056 server->stat.my_channels--;
2060 /* Remove client from channel's client list */
2061 silc_list_del(channel->user_list, chl);
2063 server->stat.my_chanclients--;
2065 /* If there is no global users on the channel anymore mark the channel
2066 as local channel. */
2067 if (server->server_type == SILC_SERVER &&
2068 !silc_server_channel_has_global(channel))
2069 channel->global_users = FALSE;
2071 /* If there is not at least one local user on the channel then we don't
2072 need the channel entry anymore, we can remove it safely. */
2073 if (server->server_type == SILC_SERVER &&
2074 !silc_server_channel_has_local(channel)) {
2075 /* Notify about leaving client if this channel has global users. */
2076 if (channel->global_users)
2077 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2078 SILC_NOTIFY_TYPE_SIGNOFF,
2079 signoff_message ? 2 : 1,
2080 clidp->data, clidp->len,
2081 signoff_message, signoff_message ?
2082 strlen(signoff_message) : 0);
2084 if (!silc_idlist_del_channel(server->local_list, channel))
2085 silc_idlist_del_channel(server->global_list, channel);
2086 server->stat.my_channels--;
2090 /* Send notify to channel about client leaving SILC and thus
2091 the entire channel. */
2092 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2093 SILC_NOTIFY_TYPE_SIGNOFF,
2094 signoff_message ? 2 : 1,
2095 clidp->data, clidp->len,
2096 signoff_message, signoff_message ?
2097 strlen(signoff_message) : 0);
2100 silc_buffer_free(clidp);
2103 /* Removes client from one channel. This is used for example when client
2104 calls LEAVE command to remove itself from the channel. Returns TRUE
2105 if channel still exists and FALSE if the channel is removed when
2106 last client leaves the channel. If `notify' is FALSE notify messages
2109 int silc_server_remove_from_one_channel(SilcServer server,
2110 SilcSocketConnection sock,
2111 SilcChannelEntry channel,
2112 SilcClientEntry client,
2115 SilcChannelEntry ch;
2116 SilcChannelClientEntry chl;
2119 SILC_LOG_DEBUG(("Start"));
2121 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2123 /* Remove the client from the channel. The client is removed from
2124 the channel's user list. */
2125 silc_list_start(client->channels);
2126 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
2127 if (chl->channel != channel)
2132 /* Remove channel from client's channel list */
2133 silc_list_del(client->channels, chl);
2135 /* Remove channel if there is no users anymore */
2136 if (server->server_type == SILC_ROUTER &&
2137 silc_list_count(channel->user_list) < 2) {
2138 if (!silc_idlist_del_channel(server->local_list, channel))
2139 silc_idlist_del_channel(server->global_list, channel);
2140 silc_buffer_free(clidp);
2141 server->stat.my_channels--;
2145 /* Remove client from channel's client list */
2146 silc_list_del(channel->user_list, chl);
2148 server->stat.my_chanclients--;
2150 /* If there is no global users on the channel anymore mark the channel
2151 as local channel. */
2152 if (server->server_type == SILC_SERVER &&
2153 !silc_server_channel_has_global(channel))
2154 channel->global_users = FALSE;
2156 /* If there is not at least one local user on the channel then we don't
2157 need the channel entry anymore, we can remove it safely. */
2158 if (server->server_type == SILC_SERVER &&
2159 !silc_server_channel_has_local(channel)) {
2160 /* Notify about leaving client if this channel has global users. */
2161 if (notify && channel->global_users)
2162 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2163 SILC_NOTIFY_TYPE_LEAVE, 1,
2164 clidp->data, clidp->len);
2166 if (!silc_idlist_del_channel(server->local_list, channel))
2167 silc_idlist_del_channel(server->global_list, channel);
2168 silc_buffer_free(clidp);
2169 server->stat.my_channels--;
2173 /* Send notify to channel about client leaving the channel */
2175 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2176 SILC_NOTIFY_TYPE_LEAVE, 1,
2177 clidp->data, clidp->len);
2181 silc_buffer_free(clidp);
2185 /* Returns TRUE if the given client is on the channel. FALSE if not.
2186 This works because we assure that the user list on the channel is
2187 always in up to date thus we can only check the channel list from
2188 `client' which is faster than checking the user list from `channel'. */
2190 int silc_server_client_on_channel(SilcClientEntry client,
2191 SilcChannelEntry channel)
2193 SilcChannelClientEntry chl;
2195 if (!client || !channel)
2198 silc_list_start(client->channels);
2199 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END)
2200 if (chl->channel == channel)
2206 /* Timeout callback. This is called if connection is idle or for some
2207 other reason is not responding within some period of time. This
2208 disconnects the remote end. */
2210 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2212 SilcServer server = (SilcServer)context;
2213 SilcSocketConnection sock = server->sockets[fd];
2218 if (sock->user_data)
2219 silc_server_free_sock_user_data(server, sock);
2221 silc_server_disconnect_remote(server, sock,
2222 "Server closed connection: "
2223 "Connection timeout");
2226 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2227 function may be used only by router. In real SILC network all channels
2228 are created by routers thus this function is never used by normal
2231 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2232 SilcServerID *router_id,
2237 SilcChannelID *channel_id;
2238 SilcChannelEntry entry;
2241 SILC_LOG_DEBUG(("Creating new channel"));
2246 /* Allocate cipher */
2247 silc_cipher_alloc(cipher, &key);
2249 channel_name = strdup(channel_name);
2251 /* Create the channel */
2252 silc_id_create_channel_id(router_id, server->rng, &channel_id);
2253 entry = silc_idlist_add_channel(server->local_list, channel_name,
2254 SILC_CHANNEL_MODE_NONE, channel_id,
2257 silc_free(channel_name);
2261 /* Now create the actual key material */
2262 silc_server_create_channel_key(server, entry, 16);
2264 /* Notify other routers about the new channel. We send the packet
2265 to our primary route. */
2266 if (broadcast && server->standalone == FALSE) {
2267 silc_server_send_new_channel(server, server->router->connection, TRUE,
2268 channel_name, entry->id, SILC_ID_CHANNEL_LEN);
2271 server->stat.my_channels++;
2276 /* Same as above but creates the channel with Channel ID `channel_id. */
2279 silc_server_create_new_channel_with_id(SilcServer server,
2282 SilcChannelID *channel_id,
2285 SilcChannelEntry entry;
2288 SILC_LOG_DEBUG(("Creating new channel"));
2293 /* Allocate cipher */
2294 silc_cipher_alloc(cipher, &key);
2296 channel_name = strdup(channel_name);
2298 /* Create the channel */
2299 entry = silc_idlist_add_channel(server->local_list, channel_name,
2300 SILC_CHANNEL_MODE_NONE, channel_id,
2303 silc_free(channel_name);
2307 /* Now create the actual key material */
2308 silc_server_create_channel_key(server, entry, 16);
2310 /* Notify other routers about the new channel. We send the packet
2311 to our primary route. */
2312 if (broadcast && server->standalone == FALSE) {
2313 silc_server_send_new_channel(server, server->router->connection, TRUE,
2314 channel_name, entry->id, SILC_ID_CHANNEL_LEN);
2317 server->stat.my_channels++;
2322 /* Generates new channel key. This is used to create the initial channel key
2323 but also to re-generate new key for channel. If `key_len' is provided
2324 it is the bytes of the key length. */
2326 void silc_server_create_channel_key(SilcServer server,
2327 SilcChannelEntry channel,
2328 unsigned int key_len)
2331 unsigned char channel_key[32];
2334 if (!channel->channel_key)
2335 silc_cipher_alloc("twofish", &channel->channel_key);
2339 else if (channel->key_len)
2340 len = channel->key_len / 8;
2342 len = sizeof(channel_key);
2344 /* Create channel key */
2345 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
2348 channel->channel_key->cipher->set_key(channel->channel_key->context,
2351 /* Remove old key if exists */
2353 memset(channel->key, 0, channel->key_len / 8);
2354 silc_free(channel->key);
2358 channel->key_len = len * 8;
2359 channel->key = silc_calloc(len, sizeof(*channel->key));
2360 memcpy(channel->key, channel_key, len);
2361 memset(channel_key, 0, sizeof(channel_key));
2364 /* Saves the channel key found in the encoded `key_payload' buffer. This
2365 function is used when we receive Channel Key Payload and also when we're
2366 processing JOIN command reply. Returns entry to the channel. */
2368 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
2369 SilcBuffer key_payload,
2370 SilcChannelEntry channel)
2372 SilcChannelKeyPayload payload = NULL;
2373 SilcChannelID *id = NULL;
2375 unsigned int tmp_len;
2378 /* Decode channel key payload */
2379 payload = silc_channel_key_payload_parse(key_payload);
2381 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
2386 /* Get the channel entry */
2389 /* Get channel ID */
2390 tmp = silc_channel_key_get_id(payload, &tmp_len);
2391 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
2397 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
2399 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
2401 SILC_LOG_ERROR(("Received key for non-existent channel"));
2407 tmp = silc_channel_key_get_key(payload, &tmp_len);
2413 cipher = silc_channel_key_get_cipher(payload, NULL);;
2419 /* Remove old key if exists */
2421 memset(channel->key, 0, channel->key_len / 8);
2422 silc_free(channel->key);
2423 silc_cipher_free(channel->channel_key);
2426 /* Create new cipher */
2427 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
2433 channel->key_len = tmp_len * 8;
2434 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
2435 memcpy(channel->key, tmp, tmp_len);
2436 channel->channel_key->cipher->set_key(channel->channel_key->context,
2443 silc_channel_key_payload_free(payload);
2448 /* Heartbeat callback. This function is set as argument for the
2449 silc_socket_set_heartbeat function. The library will call this function
2450 at the set time interval. */
2452 void silc_server_perform_heartbeat(SilcSocketConnection sock,
2455 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
2457 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname,
2460 /* Send the heartbeat */
2461 silc_server_send_heartbeat(hb->server, sock);
2464 /* Returns assembled of all servers in the given ID list. The packet's
2465 form is dictated by the New ID payload. */
2467 static void silc_server_announce_get_servers(SilcServer server,
2469 SilcBuffer *servers)
2471 SilcIDCacheList list;
2472 SilcIDCacheEntry id_cache;
2473 SilcServerEntry entry;
2476 /* Go through all clients in the list */
2477 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
2478 SILC_ID_SERVER, &list)) {
2479 if (silc_idcache_list_first(list, &id_cache)) {
2481 entry = (SilcServerEntry)id_cache->context;
2483 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2485 *servers = silc_buffer_realloc(*servers,
2487 (*servers)->truelen + idp->len :
2489 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
2490 silc_buffer_put(*servers, idp->data, idp->len);
2491 silc_buffer_pull(*servers, idp->len);
2492 silc_buffer_free(idp);
2494 if (!silc_idcache_list_next(list, &id_cache))
2499 silc_idcache_list_free(list);
2503 /* This function is used by router to announce existing servers to our
2504 primary router when we've connected to it. */
2506 void silc_server_announce_servers(SilcServer server)
2508 SilcBuffer servers = NULL;
2510 SILC_LOG_DEBUG(("Announcing servers"));
2512 /* Get servers in local list */
2513 silc_server_announce_get_servers(server, server->local_list, &servers);
2515 /* Get servers in global list */
2516 silc_server_announce_get_servers(server, server->global_list, &servers);
2519 silc_buffer_push(servers, servers->data - servers->head);
2520 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
2522 /* Send the packet */
2523 silc_server_packet_send(server, server->router->connection,
2524 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
2525 servers->data, servers->len, TRUE);
2527 silc_buffer_free(servers);
2531 /* Returns assembled packet of all clients in the given ID list. The
2532 packet's form is dictated by the New ID Payload. */
2534 static void silc_server_announce_get_clients(SilcServer server,
2536 SilcBuffer *clients)
2538 SilcIDCacheList list;
2539 SilcIDCacheEntry id_cache;
2540 SilcClientEntry client;
2543 /* Go through all clients in the list */
2544 if (silc_idcache_find_by_id(id_list->clients, SILC_ID_CACHE_ANY,
2545 SILC_ID_CLIENT, &list)) {
2546 if (silc_idcache_list_first(list, &id_cache)) {
2548 client = (SilcClientEntry)id_cache->context;
2550 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2552 *clients = silc_buffer_realloc(*clients,
2554 (*clients)->truelen + idp->len :
2556 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
2557 silc_buffer_put(*clients, idp->data, idp->len);
2558 silc_buffer_pull(*clients, idp->len);
2559 silc_buffer_free(idp);
2561 if (!silc_idcache_list_next(list, &id_cache))
2566 silc_idcache_list_free(list);
2570 /* This function is used to announce our existing clients to our router
2571 when we've connected to it. */
2573 void silc_server_announce_clients(SilcServer server)
2575 SilcBuffer clients = NULL;
2577 SILC_LOG_DEBUG(("Announcing clients"));
2579 /* Get clients in local list */
2580 silc_server_announce_get_clients(server, server->local_list,
2583 /* As router we announce our global list as well */
2584 if (server->server_type == SILC_ROUTER)
2585 silc_server_announce_get_clients(server, server->global_list,
2589 silc_buffer_push(clients, clients->data - clients->head);
2590 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
2592 /* Send the packet */
2593 silc_server_packet_send(server, server->router->connection,
2594 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
2595 clients->data, clients->len, TRUE);
2597 silc_buffer_free(clients);
2602 silc_server_announce_encode_join(unsigned int argc, ...)
2607 return silc_notify_payload_encode(SILC_NOTIFY_TYPE_JOIN, argc, ap);
2610 /* Returns assembled packets for all channels and users on those channels
2611 from the given ID List. The packets are in the form dictated by the
2612 New Channel and New Channel User payloads. */
2614 static void silc_server_announce_get_channels(SilcServer server,
2616 SilcBuffer *channels,
2617 SilcBuffer *channel_users)
2619 SilcIDCacheList list;
2620 SilcIDCacheEntry id_cache;
2621 SilcChannelEntry channel;
2622 SilcChannelClientEntry chl;
2625 unsigned short name_len;
2628 /* Go through all channels in the list */
2629 if (silc_idcache_find_by_id(id_list->channels, SILC_ID_CACHE_ANY,
2630 SILC_ID_CHANNEL, &list)) {
2631 if (silc_idcache_list_first(list, &id_cache)) {
2633 channel = (SilcChannelEntry)id_cache->context;
2635 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
2636 name_len = strlen(channel->channel_name);
2638 len = 4 + name_len + SILC_ID_CHANNEL_LEN;
2640 silc_buffer_realloc(*channels,
2641 (*channels ? (*channels)->truelen + len : len));
2642 silc_buffer_pull_tail(*channels,
2643 ((*channels)->end - (*channels)->data));
2644 silc_buffer_format(*channels,
2645 SILC_STR_UI_SHORT(name_len),
2646 SILC_STR_UI_XNSTRING(channel->channel_name,
2648 SILC_STR_UI_SHORT(SILC_ID_CHANNEL_LEN),
2649 SILC_STR_UI_XNSTRING(cid, SILC_ID_CHANNEL_LEN),
2651 silc_buffer_pull(*channels, len);
2653 /* Now find all users on the channel */
2654 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2655 silc_list_start(channel->user_list);
2656 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
2660 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
2662 tmp = silc_server_announce_encode_join(2, clidp->data, clidp->len,
2663 chidp->data, chidp->len);
2666 silc_buffer_realloc(*channel_users,
2668 (*channel_users)->truelen + len : len));
2669 silc_buffer_pull_tail(*channel_users,
2670 ((*channel_users)->end -
2671 (*channel_users)->data));
2673 silc_buffer_put(*channel_users, tmp->data, tmp->len);
2674 silc_buffer_pull(*channel_users, len);
2675 silc_buffer_free(clidp);
2676 silc_buffer_free(tmp);
2678 silc_buffer_free(chidp);
2682 if (!silc_idcache_list_next(list, &id_cache))
2687 silc_idcache_list_free(list);
2691 /* This function is used to announce our existing channels to our router
2692 when we've connected to it. This also announces the users on the
2693 channels to the router. */
2695 void silc_server_announce_channels(SilcServer server)
2697 SilcBuffer channels = NULL, channel_users = NULL;
2699 SILC_LOG_DEBUG(("Announcing channels and channel users"));
2701 /* Get channels and channel users in local list */
2702 silc_server_announce_get_channels(server, server->local_list,
2703 &channels, &channel_users);
2705 /* Get channels and channel users in global list */
2706 silc_server_announce_get_channels(server, server->global_list,
2707 &channels, &channel_users);
2710 silc_buffer_push(channels, channels->data - channels->head);
2711 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
2713 /* Send the packet */
2714 silc_server_packet_send(server, server->router->connection,
2715 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
2716 channels->data, channels->len,
2719 silc_buffer_free(channels);
2722 if (channel_users) {
2723 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
2724 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
2725 channel_users->len);
2727 /* Send the packet */
2728 silc_server_packet_send(server, server->router->connection,
2729 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
2730 channel_users->data, channel_users->len,
2733 silc_buffer_free(channel_users);