5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 1997 - 2000 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)
76 if (server->local_list)
77 silc_free(server->local_list);
78 if (server->global_list)
79 silc_free(server->global_list);
81 silc_rng_free(server->rng);
84 while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
85 silc_dlist_del(server->sim, sim);
88 silc_dlist_uninit(server->sim);
92 silc_free(server->params);
94 if (server->pending_commands)
95 silc_dlist_uninit(server->pending_commands);
97 silc_math_primegen_uninit(); /* XXX */
102 /* Initializes the entire SILC server. This is called always before running
103 the server. This is called only once at the initialization of the program.
104 This binds the server to its listenning port. After this function returns
105 one should call silc_server_run to start the server. This returns TRUE
106 when everything is ok to run the server. Configuration file must be
107 read and parsed before calling this. */
109 int silc_server_init(SilcServer server)
111 int *sock = NULL, sock_count = 0, i;
113 SilcServerEntry id_entry;
115 SILC_LOG_DEBUG(("Initializing server"));
117 assert(server->config);
119 /* XXX After server is made as Silc Server Library this can be given
120 as argument, for now this is hard coded */
121 server->params = silc_calloc(1, sizeof(*server->params));
122 server->params->retry_count = SILC_SERVER_RETRY_COUNT;
123 server->params->retry_interval_min = SILC_SERVER_RETRY_INTERVAL_MIN;
124 server->params->retry_interval_max = SILC_SERVER_RETRY_INTERVAL_MAX;
125 server->params->retry_keep_trying = FALSE;
126 server->params->protocol_timeout = 60;
127 server->params->require_reverse_mapping = FALSE;
129 /* Set log files where log message should be saved. */
130 server->config->server = server;
131 silc_config_server_setlogfiles(server->config);
133 /* Register all configured ciphers, PKCS and hash functions. */
134 silc_config_server_register_ciphers(server->config);
135 silc_config_server_register_pkcs(server->config);
136 silc_config_server_register_hashfuncs(server->config);
138 /* Initialize random number generator for the server. */
139 server->rng = silc_rng_alloc();
140 silc_rng_init(server->rng);
141 silc_math_primegen_init(); /* XXX */
143 /* Initialize hash functions for server to use */
144 silc_hash_alloc("md5", &server->md5hash);
145 silc_hash_alloc("sha1", &server->sha1hash);
147 /* Initialize none cipher */
148 silc_cipher_alloc("none", &server->none_cipher);
150 /* XXXXX Generate RSA key pair */
152 unsigned char *public_key;
153 unsigned char *private_key;
154 unsigned int pk_len, prv_len;
157 if (stat("pubkey.pub", &st) < 0 && stat("privkey.prv", &st) < 0) {
159 if (silc_pkcs_alloc("rsa", &server->pkcs) == FALSE) {
160 SILC_LOG_ERROR(("Could not create RSA key pair"));
164 if (server->pkcs->pkcs->init(server->pkcs->context,
165 1024, server->rng) == FALSE) {
166 SILC_LOG_ERROR(("Could not generate RSA key pair"));
170 public_key = server->pkcs->pkcs->get_public_key(server->pkcs->context,
172 private_key = server->pkcs->pkcs->get_private_key(server->pkcs->context,
175 SILC_LOG_HEXDUMP(("public key"), public_key, pk_len);
176 SILC_LOG_HEXDUMP(("private key"), private_key, prv_len);
179 silc_pkcs_public_key_alloc("rsa", "UN=root, HN=dummy",
181 server->private_key =
182 silc_pkcs_private_key_alloc("rsa", private_key, prv_len);
185 silc_pkcs_save_public_key("pubkey.pub", server->public_key,
187 silc_pkcs_save_private_key("privkey.prv", server->private_key, NULL,
190 memset(public_key, 0, pk_len);
191 memset(private_key, 0, prv_len);
192 silc_free(public_key);
193 silc_free(private_key);
195 silc_pkcs_load_public_key("pubkey.pub", &server->public_key,
197 silc_pkcs_load_private_key("privkey.prv", &server->private_key,
202 /* Create a listening server. Note that our server can listen on
203 multiple ports. All listeners are created here and now. */
204 /* XXX Still check this whether to use server_info or listen_port. */
206 while(server->config->listen_port) {
209 tmp = silc_net_create_server(server->config->listen_port->port,
210 server->config->listen_port->host);
214 sock = silc_realloc(sock, (sizeof(int *) * (sock_count + 1)));
215 sock[sock_count] = tmp;
216 server->config->listen_port = server->config->listen_port->next;
220 /* Initialize ID caches */
221 server->local_list->clients = silc_idcache_alloc(0);
222 server->local_list->servers = silc_idcache_alloc(0);
223 server->local_list->channels = silc_idcache_alloc(0);
225 /* These are allocated for normal server as well as these hold some
226 global information that the server has fetched from its router. For
227 router these are used as they are supposed to be used on router. */
228 server->global_list->clients = silc_idcache_alloc(0);
229 server->global_list->servers = silc_idcache_alloc(0);
230 server->global_list->channels = silc_idcache_alloc(0);
232 /* Allocate the entire socket list that is used in server. Eventually
233 all connections will have entry in this table (it is a table of
234 pointers to the actual object that is allocated individually
236 server->sockets = silc_calloc(SILC_SERVER_MAX_CONNECTIONS,
237 sizeof(*server->sockets));
239 for (i = 0; i < sock_count; i++) {
240 SilcSocketConnection newsocket = NULL;
242 /* Set socket to non-blocking mode */
243 silc_net_set_socket_nonblock(sock[i]);
244 server->sock = sock[i];
246 /* Create a Server ID for the server. */
247 silc_id_create_server_id(sock[i], server->rng, &id);
253 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
254 server->id_string_len = silc_id_get_len(SILC_ID_SERVER);
255 server->id_type = SILC_ID_SERVER;
256 server->server_name = server->config->server_info->server_name;
258 /* Add ourselves to the server list. We don't have a router yet
259 beacuse we haven't established a route yet. It will be done later.
260 For now, NULL is sent as router. This allocates new entry to
263 silc_idlist_add_server(server->local_list,
264 server->config->server_info->server_name,
265 server->server_type, server->id, NULL, NULL);
267 SILC_LOG_ERROR(("Could not add ourselves to cache"));
271 /* Add ourselves also to the socket table. The entry allocated above
272 is sent as argument for fast referencing in the future. */
273 silc_socket_alloc(sock[i], SILC_SOCKET_TYPE_SERVER, id_entry,
278 server->sockets[sock[i]] = newsocket;
280 /* Put the allocated socket pointer also to the entry allocated above
281 for fast back-referencing to the socket list. */
282 id_entry->connection = (void *)server->sockets[sock[i]];
283 server->id_entry = id_entry;
286 /* Register the task queues. In SILC we have by default three task queues.
287 One task queue for non-timeout tasks which perform different kind of
288 I/O on file descriptors, timeout task queue for timeout tasks, and,
289 generic non-timeout task queue whose tasks apply to all connections. */
290 silc_task_queue_alloc(&server->io_queue, TRUE);
291 if (!server->io_queue) {
294 silc_task_queue_alloc(&server->timeout_queue, TRUE);
295 if (!server->timeout_queue) {
298 silc_task_queue_alloc(&server->generic_queue, TRUE);
299 if (!server->generic_queue) {
303 /* Register protocols */
304 silc_server_protocols_register();
306 /* Initialize the scheduler */
307 silc_schedule_init(&server->io_queue, &server->timeout_queue,
308 &server->generic_queue,
309 SILC_SERVER_MAX_CONNECTIONS);
311 /* Add the first task to the queue. This is task that is executed by
312 timeout. It expires as soon as the caller calls silc_server_run. This
313 task performs authentication protocol and key exchange with our
315 silc_task_register(server->timeout_queue, sock[0],
316 silc_server_connect_to_router,
317 (void *)server, 0, 1,
319 SILC_TASK_PRI_NORMAL);
321 /* Add listener task to the queue. This task receives new connections to the
322 server. This task remains on the queue until the end of the program. */
323 silc_task_register(server->io_queue, sock[0],
324 silc_server_accept_new_connection,
325 (void *)server, 0, 0,
327 SILC_TASK_PRI_NORMAL);
328 server->listenning = TRUE;
330 /* If server connections has been configured then we must be router as
331 normal server cannot have server connections, only router connections. */
332 if (server->config->servers)
333 server->server_type = SILC_ROUTER;
335 SILC_LOG_DEBUG(("Server initialized"));
337 /* We are done here, return succesfully */
340 silc_task_queue_free(server->timeout_queue);
342 silc_task_queue_free(server->io_queue);
344 for (i = 0; i < sock_count; i++)
345 silc_net_close_server(sock[i]);
350 /* Stops the SILC server. This function is used to shutdown the server.
351 This is usually called after the scheduler has returned. After stopping
352 the server one should call silc_server_free. */
354 void silc_server_stop(SilcServer server)
356 SILC_LOG_DEBUG(("Stopping server"));
358 /* Stop the scheduler, although it might be already stopped. This
359 doesn't hurt anyone. This removes all the tasks and task queues,
361 silc_schedule_stop();
362 silc_schedule_uninit();
364 silc_server_protocols_unregister();
366 SILC_LOG_DEBUG(("Server stopped"));
369 /* The heart of the server. This runs the scheduler thus runs the server.
370 When this returns the server has been stopped and the program will
373 void silc_server_run(SilcServer server)
375 SILC_LOG_DEBUG(("Running server"));
377 /* Start the scheduler, the heart of the SILC server. When this returns
378 the program will be terminated. */
382 /* Timeout callback that will be called to retry connecting to remote
383 router. This is used by both normal and router server. This will wait
384 before retrying the connecting. The timeout is generated by exponential
385 backoff algorithm. */
387 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
389 SilcServerConnection sconn = (SilcServerConnection)context;
390 SilcServer server = sconn->server;
392 SILC_LOG_INFO(("Retrying connecting to a router"));
394 /* Calculate next timeout */
395 if (sconn->retry_count >= 1) {
396 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
397 if (sconn->retry_timeout > SILC_SERVER_RETRY_INTERVAL_MAX)
398 sconn->retry_timeout = SILC_SERVER_RETRY_INTERVAL_MAX;
400 sconn->retry_timeout = server->params->retry_interval_min;
402 sconn->retry_count++;
403 sconn->retry_timeout = sconn->retry_timeout +
404 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
406 /* If we've reached max retry count, give up. */
407 if (sconn->retry_count > server->params->retry_count &&
408 server->params->retry_keep_trying == FALSE) {
409 SILC_LOG_ERROR(("Could not connect to router, giving up"));
413 /* Wait one before retrying */
414 silc_task_register(server->timeout_queue, fd, silc_server_connect_router,
415 context, sconn->retry_timeout,
416 server->params->retry_interval_min_usec,
417 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
420 /* Generic routine to use connect to a router. */
422 SILC_TASK_CALLBACK(silc_server_connect_router)
424 SilcServerConnection sconn = (SilcServerConnection)context;
425 SilcServer server = sconn->server;
426 SilcSocketConnection newsocket;
427 SilcProtocol protocol;
428 SilcServerKEInternalContext *proto_ctx;
431 /* Connect to remote host */
432 sock = silc_net_create_connection(sconn->remote_port,
435 SILC_LOG_ERROR(("Could not connect to router"));
436 silc_task_register(server->timeout_queue, fd,
437 silc_server_connect_to_router_retry,
438 context, 0, 1, SILC_TASK_TIMEOUT,
439 SILC_TASK_PRI_NORMAL);
443 /* Set socket options */
444 silc_net_set_socket_nonblock(sock);
445 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
447 /* Create socket connection for the connection. Even though we
448 know that we are connecting to a router we will mark the socket
449 to be unknown connection until we have executed authentication
451 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
452 server->sockets[sock] = newsocket;
453 newsocket->hostname = sconn->remote_host;
454 newsocket->port = sconn->remote_port;
455 sconn->sock = newsocket;
457 /* Allocate internal protocol context. This is sent as context
459 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
460 proto_ctx->server = (void *)server;
461 proto_ctx->context = (void *)sconn;
462 proto_ctx->sock = newsocket;
463 proto_ctx->rng = server->rng;
464 proto_ctx->responder = FALSE;
466 /* Perform key exchange protocol. silc_server_connect_to_router_second
467 will be called after the protocol is finished. */
468 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
469 &protocol, proto_ctx,
470 silc_server_connect_to_router_second);
471 newsocket->protocol = protocol;
473 /* Register a timeout task that will be executed if the protocol
474 is not executed within set limit. */
475 proto_ctx->timeout_task =
476 silc_task_register(server->timeout_queue, sock,
477 silc_server_timeout_remote,
478 server, server->params->protocol_timeout,
479 server->params->protocol_timeout_usec,
483 /* Register the connection for network input and output. This sets
484 that scheduler will listen for incoming packets for this connection
485 and sets that outgoing packets may be sent to this connection as
486 well. However, this doesn't set the scheduler for outgoing traffic,
487 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
488 later when outgoing data is available. */
489 context = (void *)server;
490 SILC_REGISTER_CONNECTION_FOR_IO(sock);
492 /* Run the protocol */
493 protocol->execute(server->timeout_queue, 0, protocol, sock, 0, 0);
496 /* This function connects to our primary router or if we are a router this
497 establishes all our primary routes. This is called at the start of the
498 server to do authentication and key exchange with our router - called
501 SILC_TASK_CALLBACK(silc_server_connect_to_router)
503 SilcServer server = (SilcServer)context;
504 SilcServerConnection sconn;
506 SILC_LOG_DEBUG(("Connecting to router(s)"));
508 /* If we are normal SILC server we need to connect to our cell's
510 if (server->server_type == SILC_SERVER) {
511 SILC_LOG_DEBUG(("We are normal server"));
513 /* Create connection to the router, if configured. */
514 if (server->config->routers) {
516 /* Allocate connection object for hold connection specific stuff. */
517 sconn = silc_calloc(1, sizeof(*sconn));
518 sconn->server = server;
519 sconn->remote_host = server->config->routers->host;
520 sconn->remote_port = server->config->routers->port;
522 silc_task_register(server->timeout_queue, fd,
523 silc_server_connect_router,
524 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
525 SILC_TASK_PRI_NORMAL);
530 /* If we are a SILC router we need to establish all of our primary
532 if (server->server_type == SILC_ROUTER) {
533 SilcConfigServerSectionServerConnection *ptr;
535 SILC_LOG_DEBUG(("We are router"));
537 /* Create the connections to all our routes */
538 ptr = server->config->routers;
541 SILC_LOG_DEBUG(("Router connection [%s] %s:%d",
542 ptr->initiator ? "Initiator" : "Responder",
543 ptr->host, ptr->port));
545 if (ptr->initiator) {
546 /* Allocate connection object for hold connection specific stuff. */
547 sconn = silc_calloc(1, sizeof(*sconn));
548 sconn->server = server;
549 sconn->remote_host = ptr->host;
550 sconn->remote_port = ptr->port;
552 silc_task_register(server->timeout_queue, fd,
553 silc_server_connect_router,
554 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
555 SILC_TASK_PRI_NORMAL);
565 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
567 /* There wasn't a configured router, we will continue but we don't
568 have a connection to outside world. We will be standalone server. */
569 server->standalone = TRUE;
572 /* Second part of connecting to router(s). Key exchange protocol has been
573 executed and now we will execute authentication protocol. */
575 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
577 SilcProtocol protocol = (SilcProtocol)context;
578 SilcServerKEInternalContext *ctx =
579 (SilcServerKEInternalContext *)protocol->context;
580 SilcServer server = (SilcServer)ctx->server;
581 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
582 SilcSocketConnection sock = NULL;
583 SilcServerConnAuthInternalContext *proto_ctx;
585 SILC_LOG_DEBUG(("Start"));
587 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
588 /* Error occured during protocol */
589 silc_protocol_free(protocol);
591 silc_packet_context_free(ctx->packet);
593 silc_ske_free(ctx->ske);
595 silc_free(ctx->dest_id);
597 sock->protocol = NULL;
598 silc_server_disconnect_remote(server, sock, "Server closed connection: "
599 "Key exchange failed");
603 /* Allocate internal context for the authentication protocol. This
604 is sent as context for the protocol. */
605 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
606 proto_ctx->server = (void *)server;
607 proto_ctx->context = (void *)sconn;
608 proto_ctx->sock = sock = server->sockets[fd];
609 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
610 proto_ctx->dest_id_type = ctx->dest_id_type;
611 proto_ctx->dest_id = ctx->dest_id;
613 /* Resolve the authentication method used in this connection */
614 proto_ctx->auth_meth = SILC_PROTOCOL_CONN_AUTH_PASSWORD;
615 if (server->config->routers) {
616 SilcConfigServerSectionServerConnection *conn = NULL;
618 /* Check if we find a match from user configured connections */
619 conn = silc_config_server_find_router_conn(server->config,
623 /* Match found. Use the configured authentication method */
624 proto_ctx->auth_meth = conn->auth_meth;
625 if (conn->auth_data) {
626 proto_ctx->auth_data = strdup(conn->auth_data);
627 proto_ctx->auth_data_len = strlen(conn->auth_data);
630 /* No match found. */
637 /* Free old protocol as it is finished now */
638 silc_protocol_free(protocol);
640 silc_packet_context_free(ctx->packet);
642 sock->protocol = NULL;
644 /* Allocate the authentication protocol. This is allocated here
645 but we won't start it yet. We will be receiving party of this
646 protocol thus we will wait that connecting party will make
648 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
649 &sock->protocol, proto_ctx,
650 silc_server_connect_to_router_final);
652 /* Register timeout task. If the protocol is not executed inside
653 this timelimit the connection will be terminated. Currently
654 this is 15 seconds and is hard coded limit (XXX). */
655 proto_ctx->timeout_task =
656 silc_task_register(server->timeout_queue, sock->sock,
657 silc_server_timeout_remote,
658 (void *)server, 15, 0,
662 /* Run the protocol */
663 sock->protocol->execute(server->timeout_queue, 0,
664 sock->protocol, sock->sock, 0, 0);
667 /* Finalizes the connection to router. Registers a server task to the
668 queue so that we can accept new connections. */
670 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
672 SilcProtocol protocol = (SilcProtocol)context;
673 SilcServerConnAuthInternalContext *ctx =
674 (SilcServerConnAuthInternalContext *)protocol->context;
675 SilcServer server = (SilcServer)ctx->server;
676 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
677 SilcSocketConnection sock = ctx->sock;
678 SilcServerEntry id_entry;
680 unsigned char *id_string;
682 SILC_LOG_DEBUG(("Start"));
684 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
685 /* Error occured during protocol */
687 silc_free(ctx->dest_id);
688 silc_server_disconnect_remote(server, sock, "Server closed connection: "
689 "Authentication failed");
693 /* Add a task to the queue. This task receives new connections to the
694 server. This task remains on the queue until the end of the program. */
695 if (!server->listenning) {
696 silc_task_register(server->io_queue, server->sock,
697 silc_server_accept_new_connection,
698 (void *)server, 0, 0,
700 SILC_TASK_PRI_NORMAL);
701 server->listenning = TRUE;
704 /* Send NEW_SERVER packet to the router. We will become registered
705 to the SILC network after sending this packet. */
706 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
707 packet = silc_buffer_alloc(2 + 2 + SILC_ID_SERVER_LEN +
708 strlen(server->server_name));
709 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
710 silc_buffer_format(packet,
711 SILC_STR_UI_SHORT(SILC_ID_SERVER_LEN),
712 SILC_STR_UI_XNSTRING(id_string, SILC_ID_SERVER_LEN),
713 SILC_STR_UI_SHORT(strlen(server->server_name)),
714 SILC_STR_UI_XNSTRING(server->server_name,
715 strlen(server->server_name)),
718 /* Send the packet */
719 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
720 packet->data, packet->len, TRUE);
721 silc_buffer_free(packet);
722 silc_free(id_string);
724 SILC_LOG_DEBUG(("Connected to router %s", sock->hostname));
726 /* Add the connected router to local server list */
727 server->standalone = FALSE;
728 id_entry = silc_idlist_add_server(server->local_list, sock->hostname,
729 SILC_ROUTER, ctx->dest_id, NULL, sock);
732 silc_free(ctx->dest_id);
733 silc_server_disconnect_remote(server, sock, "Server closed connection: "
734 "Authentication failed");
738 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
739 silc_free(sock->user_data);
740 sock->user_data = (void *)id_entry;
741 sock->type = SILC_SOCKET_TYPE_ROUTER;
742 server->id_entry->router = id_entry;
743 server->router = id_entry;
744 server->router->data.registered = TRUE;
747 /* Free the temporary connection data context */
751 /* Free the protocol object */
752 silc_protocol_free(protocol);
754 silc_packet_context_free(ctx->packet);
756 silc_ske_free(ctx->ske);
758 sock->protocol = NULL;
761 /* Accepts new connections to the server. Accepting new connections are
762 done in three parts to make it async. */
764 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
766 SilcServer server = (SilcServer)context;
767 SilcSocketConnection newsocket;
768 SilcServerKEInternalContext *proto_ctx;
771 SILC_LOG_DEBUG(("Accepting new connection"));
773 sock = silc_net_accept_connection(server->sock);
775 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
779 /* Check max connections */
780 if (sock > SILC_SERVER_MAX_CONNECTIONS) {
781 if (server->config->redirect) {
782 /* XXX Redirecting connection to somewhere else now?? */
783 /*silc_server_send_notify("Server is full, trying to redirect..."); */
785 SILC_LOG_ERROR(("Refusing connection, server is full"));
790 /* Set socket options */
791 silc_net_set_socket_nonblock(sock);
792 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
794 /* We don't create a ID yet, since we don't know what type of connection
795 this is yet. But, we do add the connection to the socket table. */
796 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
797 server->sockets[sock] = newsocket;
799 /* XXX This MUST be done async as this will block the entire server
800 process. Either we have to do our own resolver stuff or in the future
801 we can use threads. */
802 /* Perform name and address lookups for the remote host. */
803 silc_net_check_host_by_sock(sock, &newsocket->hostname, &newsocket->ip);
804 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
806 SILC_LOG_ERROR(("IP/DNS lookup failed"));
809 if (!newsocket->hostname)
810 newsocket->hostname = strdup(newsocket->ip);
812 SILC_LOG_INFO(("Incoming connection from %s (%s)", newsocket->hostname,
815 /* Allocate internal context for key exchange protocol. This is
816 sent as context for the protocol. */
817 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
818 proto_ctx->server = context;
819 proto_ctx->sock = newsocket;
820 proto_ctx->rng = server->rng;
821 proto_ctx->responder = TRUE;
823 /* Prepare the connection for key exchange protocol. We allocate the
824 protocol but will not start it yet. The connector will be the
825 initiator of the protocol thus we will wait for initiation from
826 there before we start the protocol. */
827 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
828 &newsocket->protocol, proto_ctx,
829 silc_server_accept_new_connection_second);
831 /* Register a timeout task that will be executed if the connector
832 will not start the key exchange protocol within 60 seconds. For
833 now, this is a hard coded limit. After 60 secs the connection will
834 be closed if the key exchange protocol has not been started. */
835 proto_ctx->timeout_task =
836 silc_task_register(server->timeout_queue, newsocket->sock,
837 silc_server_timeout_remote,
842 /* Register the connection for network input and output. This sets
843 that scheduler will listen for incoming packets for this connection
844 and sets that outgoing packets may be sent to this connection as well.
845 However, this doesn't set the scheduler for outgoing traffic, it
846 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
847 later when outgoing data is available. */
848 SILC_REGISTER_CONNECTION_FOR_IO(sock);
851 /* Second part of accepting new connection. Key exchange protocol has been
852 performed and now it is time to do little connection authentication
853 protocol to figure out whether this connection is client or server
854 and whether it has right to access this server (especially server
855 connections needs to be authenticated). */
857 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
859 SilcProtocol protocol = (SilcProtocol)context;
860 SilcServerKEInternalContext *ctx =
861 (SilcServerKEInternalContext *)protocol->context;
862 SilcServer server = (SilcServer)ctx->server;
863 SilcSocketConnection sock = NULL;
864 SilcServerConnAuthInternalContext *proto_ctx;
866 SILC_LOG_DEBUG(("Start"));
868 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
869 /* Error occured during protocol */
870 silc_protocol_free(protocol);
872 silc_packet_context_free(ctx->packet);
874 silc_ske_free(ctx->ske);
876 silc_free(ctx->dest_id);
879 sock->protocol = NULL;
880 silc_server_disconnect_remote(server, sock, "Server closed connection: "
881 "Key exchange failed");
885 /* Allocate internal context for the authentication protocol. This
886 is sent as context for the protocol. */
887 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
888 proto_ctx->server = (void *)server;
889 proto_ctx->sock = sock = server->sockets[fd];
890 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
891 proto_ctx->responder = TRUE;
892 proto_ctx->dest_id_type = ctx->dest_id_type;
893 proto_ctx->dest_id = ctx->dest_id;
895 /* Free old protocol as it is finished now */
896 silc_protocol_free(protocol);
898 silc_packet_context_free(ctx->packet);
900 sock->protocol = NULL;
902 /* Allocate the authentication protocol. This is allocated here
903 but we won't start it yet. We will be receiving party of this
904 protocol thus we will wait that connecting party will make
906 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
907 &sock->protocol, proto_ctx,
908 silc_server_accept_new_connection_final);
910 /* Register timeout task. If the protocol is not executed inside
911 this timelimit the connection will be terminated. Currently
912 this is 60 seconds and is hard coded limit (XXX). */
913 proto_ctx->timeout_task =
914 silc_task_register(server->timeout_queue, sock->sock,
915 silc_server_timeout_remote,
916 (void *)server, 60, 0,
921 /* Final part of accepting new connection. The connection has now
922 been authenticated and keys has been exchanged. We also know whether
923 this is client or server connection. */
925 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
927 SilcProtocol protocol = (SilcProtocol)context;
928 SilcServerConnAuthInternalContext *ctx =
929 (SilcServerConnAuthInternalContext *)protocol->context;
930 SilcServer server = (SilcServer)ctx->server;
931 SilcSocketConnection sock = ctx->sock;
932 void *id_entry = NULL;
934 SILC_LOG_DEBUG(("Start"));
936 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
937 /* Error occured during protocol */
938 silc_protocol_free(protocol);
940 silc_packet_context_free(ctx->packet);
942 silc_ske_free(ctx->ske);
944 silc_free(ctx->dest_id);
947 sock->protocol = NULL;
948 silc_server_disconnect_remote(server, sock, "Server closed connection: "
949 "Authentication failed");
953 sock->type = ctx->conn_type;
955 case SILC_SOCKET_TYPE_CLIENT:
957 SilcClientEntry client;
959 SILC_LOG_DEBUG(("Remote host is client"));
960 SILC_LOG_INFO(("Connection from %s (%s) is client", sock->hostname,
963 /* Add the client to the client ID cache. The nickname and Client ID
964 and other information is created after we have received NEW_CLIENT
965 packet from client. */
966 client = silc_idlist_add_client(server->local_list,
967 NULL, NULL, NULL, NULL, NULL, sock);
969 SILC_LOG_ERROR(("Could not add new client to cache"));
970 silc_free(sock->user_data);
974 id_entry = (void *)client;
977 case SILC_SOCKET_TYPE_SERVER:
978 case SILC_SOCKET_TYPE_ROUTER:
980 SilcServerEntry new_server;
982 SILC_LOG_DEBUG(("Remote host is %s",
983 sock->type == SILC_SOCKET_TYPE_SERVER ?
984 "server" : "router"));
985 SILC_LOG_INFO(("Connection from %s (%s) is %s", sock->hostname,
986 sock->ip, sock->type == SILC_SOCKET_TYPE_SERVER ?
987 "server" : "router"));
989 /* Add the server into server cache. The server name and Server ID
990 is updated after we have received NEW_SERVER packet from the
991 server. We mark ourselves as router for this server if we really
994 silc_idlist_add_server(server->local_list, NULL,
995 sock->type == SILC_SOCKET_TYPE_SERVER ?
996 SILC_SERVER : SILC_ROUTER, NULL,
997 sock->type == SILC_SOCKET_TYPE_SERVER ?
998 server->id_entry : NULL, sock);
1000 SILC_LOG_ERROR(("Could not add new server to cache"));
1001 silc_free(sock->user_data);
1005 id_entry = (void *)new_server;
1007 /* There is connection to other server now, if it is router then
1008 we will have connection to outside world. If we are router but
1009 normal server connected to us then we will remain standalone,
1010 if we are standlone. */
1011 if (server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER) {
1012 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1013 server->standalone = FALSE;
1014 if (!server->id_entry->router) {
1015 server->id_entry->router = id_entry;
1016 server->router = id_entry;
1025 /* Add the common data structure to the ID entry. */
1027 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1029 /* Add to sockets internal pointer for fast referencing */
1030 silc_free(sock->user_data);
1031 sock->user_data = id_entry;
1033 /* Connection has been fully established now. Everything is ok. */
1034 SILC_LOG_DEBUG(("New connection authenticated"));
1036 silc_protocol_free(protocol);
1038 silc_packet_context_free(ctx->packet);
1040 silc_ske_free(ctx->ske);
1042 silc_free(ctx->dest_id);
1044 sock->protocol = NULL;
1047 /* This function is used to read packets from network and send packets to
1048 network. This is usually a generic task. */
1050 SILC_TASK_CALLBACK(silc_server_packet_process)
1052 SilcServer server = (SilcServer)context;
1053 SilcSocketConnection sock = server->sockets[fd];
1054 SilcIDListData idata;
1055 SilcCipher cipher = NULL;
1056 SilcHmac hmac = NULL;
1059 SILC_LOG_DEBUG(("Processing packet"));
1061 /* Packet sending */
1062 if (type == SILC_TASK_WRITE) {
1063 SILC_LOG_DEBUG(("Writing data to connection"));
1065 if (sock->outbuf->data - sock->outbuf->head)
1066 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1068 ret = silc_server_packet_send_real(server, sock, TRUE);
1070 /* If returned -2 could not write to connection now, will do
1075 /* The packet has been sent and now it is time to set the connection
1076 back to only for input. When there is again some outgoing data
1077 available for this connection it will be set for output as well.
1078 This call clears the output setting and sets it only for input. */
1079 SILC_SET_CONNECTION_FOR_INPUT(fd);
1080 SILC_UNSET_OUTBUF_PENDING(sock);
1082 silc_buffer_clear(sock->outbuf);
1086 /* Packet receiving */
1087 SILC_LOG_DEBUG(("Reading data from connection"));
1089 /* Read some data from connection */
1090 ret = silc_packet_receive(sock);
1096 SILC_LOG_DEBUG(("Read EOF"));
1098 /* If connection is disconnecting already we will finally
1099 close the connection */
1100 if (SILC_IS_DISCONNECTING(sock)) {
1101 if (sock->user_data)
1102 silc_server_free_sock_user_data(server, sock);
1103 silc_server_close_connection(server, sock);
1107 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1109 if (sock->user_data)
1110 silc_server_free_sock_user_data(server, sock);
1111 silc_server_close_connection(server, sock);
1115 /* If connection is disconnecting or disconnected we will ignore
1117 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1118 SILC_LOG_DEBUG(("Ignoring read data from invalid connection"));
1122 /* Get keys and stuff from ID entry */
1123 idata = (SilcIDListData)sock->user_data;
1125 idata->last_receive = time(NULL);
1126 cipher = idata->receive_key;
1130 /* Process the packet. This will call the parser that will then
1131 decrypt and parse the packet. */
1132 silc_packet_receive_process(sock, cipher, hmac, silc_server_packet_parse,
1136 /* Parses whole packet, received earlier. */
1138 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1140 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1141 SilcServer server = (SilcServer)parse_ctx->context;
1142 SilcSocketConnection sock = parse_ctx->sock;
1143 SilcPacketContext *packet = parse_ctx->packet;
1146 SILC_LOG_DEBUG(("Start"));
1148 /* Decrypt the received packet */
1149 ret = silc_packet_decrypt(parse_ctx->cipher, parse_ctx->hmac,
1150 packet->buffer, packet);
1155 /* Parse the packet. Packet type is returned. */
1156 ret = silc_packet_parse(packet);
1158 /* Parse the packet header in special way as this is "special"
1160 ret = silc_packet_parse_special(packet);
1163 if (ret == SILC_PACKET_NONE)
1166 if (server->server_type == SILC_ROUTER) {
1167 /* Route the packet if it is not destined to us. Other ID types but
1168 server are handled separately after processing them. */
1169 if (packet->dst_id_type == SILC_ID_SERVER &&
1170 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1171 SILC_ID_SERVER_COMPARE(packet->dst_id, server->id_string)) {
1173 /* Route the packet to fastest route for the destination ID */
1174 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_type);
1175 silc_server_packet_route(server,
1176 silc_server_route_get(server, id,
1177 packet->dst_id_type),
1183 /* Broadcast packet if it is marked as broadcast packet and it is
1184 originated from router and we are router. */
1185 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1186 packet->flags & SILC_PACKET_FLAG_BROADCAST) {
1187 silc_server_packet_broadcast(server, server->router->connection, packet);
1191 /* Parse the incoming packet type */
1192 silc_server_packet_parse_type(server, sock, packet);
1195 silc_buffer_clear(sock->inbuf);
1196 silc_packet_context_free(packet);
1197 silc_free(parse_ctx);
1200 /* Parser callback called by silc_packet_receive_process. This merely
1201 registers timeout that will handle the actual parsing when appropriate. */
1203 void silc_server_packet_parse(SilcPacketParserContext *parser_context)
1205 SilcServer server = (SilcServer)parser_context->context;
1206 SilcSocketConnection sock = parser_context->sock;
1208 switch (sock->type) {
1209 case SILC_SOCKET_TYPE_CLIENT:
1210 case SILC_SOCKET_TYPE_UNKNOWN:
1211 /* Parse the packet with timeout */
1212 silc_task_register(server->timeout_queue, sock->sock,
1213 silc_server_packet_parse_real,
1214 (void *)parser_context, 0, 100000,
1216 SILC_TASK_PRI_NORMAL);
1218 case SILC_SOCKET_TYPE_SERVER:
1219 case SILC_SOCKET_TYPE_ROUTER:
1220 /* Packets from servers are parsed as soon as possible */
1221 silc_task_register(server->timeout_queue, sock->sock,
1222 silc_server_packet_parse_real,
1223 (void *)parser_context, 0, 1,
1225 SILC_TASK_PRI_NORMAL);
1232 /* Parses the packet type and calls what ever routines the packet type
1233 requires. This is done for all incoming packets. */
1235 void silc_server_packet_parse_type(SilcServer server,
1236 SilcSocketConnection sock,
1237 SilcPacketContext *packet)
1239 SilcPacketType type = packet->type;
1241 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1243 /* Parse the packet type */
1245 case SILC_PACKET_DISCONNECT:
1246 SILC_LOG_DEBUG(("Disconnect packet"));
1249 case SILC_PACKET_SUCCESS:
1251 * Success received for something. For now we can have only
1252 * one protocol for connection executing at once hence this
1253 * success message is for whatever protocol is executing currently.
1255 SILC_LOG_DEBUG(("Success packet"));
1256 if (sock->protocol) {
1257 sock->protocol->execute(server->timeout_queue, 0,
1258 sock->protocol, sock->sock, 0, 0);
1262 case SILC_PACKET_FAILURE:
1264 * Failure received for something. For now we can have only
1265 * one protocol for connection executing at once hence this
1266 * failure message is for whatever protocol is executing currently.
1268 SILC_LOG_DEBUG(("Failure packet"));
1269 if (sock->protocol) {
1270 /* XXX Audit the failure type */
1271 sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
1272 sock->protocol->execute(server->timeout_queue, 0,
1273 sock->protocol, sock->sock, 0, 0);
1277 case SILC_PACKET_REJECT:
1278 SILC_LOG_DEBUG(("Reject packet"));
1282 case SILC_PACKET_NOTIFY:
1284 * Received notify packet. Server can receive notify packets from
1285 * router. Server then relays the notify messages to clients if needed.
1287 SILC_LOG_DEBUG(("Notify packet"));
1288 silc_server_notify(server, sock, packet);
1294 case SILC_PACKET_CHANNEL_MESSAGE:
1296 * Received channel message. Channel messages are special packets
1297 * (although probably most common ones) hence they are handled
1300 SILC_LOG_DEBUG(("Channel Message packet"));
1301 silc_server_channel_message(server, sock, packet);
1304 case SILC_PACKET_CHANNEL_KEY:
1306 * Received key for channel. As channels are created by the router
1307 * the keys are as well. We will distribute the key to all of our
1308 * locally connected clients on the particular channel. Router
1309 * never receives this channel and thus is ignored.
1311 SILC_LOG_DEBUG(("Channel Key packet"));
1312 silc_server_channel_key(server, sock, packet);
1318 case SILC_PACKET_COMMAND:
1320 * Recived command. Allocate command context and execute the command.
1322 SILC_LOG_DEBUG(("Command packet"));
1323 silc_server_command_process(server, sock, packet);
1326 case SILC_PACKET_COMMAND_REPLY:
1328 * Received command reply packet. Servers never send commands thus
1329 * they don't receive command reply packets either, except in cases
1330 * where server has forwarded command packet coming from client.
1331 * This must be the case here or we will ignore the packet.
1333 SILC_LOG_DEBUG(("Command Reply packet"));
1334 silc_server_command_reply(server, sock, packet);
1338 * Private Message packets
1340 case SILC_PACKET_PRIVATE_MESSAGE:
1342 * Received private message packet. The packet is coming from either
1345 SILC_LOG_DEBUG(("Private Message packet"));
1346 silc_server_private_message(server, sock, packet);
1349 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1356 * Key Exchange protocol packets
1358 case SILC_PACKET_KEY_EXCHANGE:
1359 SILC_LOG_DEBUG(("KE packet"));
1360 if (sock->protocol && sock->protocol->protocol->type
1361 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1363 SilcServerKEInternalContext *proto_ctx =
1364 (SilcServerKEInternalContext *)sock->protocol->context;
1366 proto_ctx->packet = silc_packet_context_dup(packet);
1368 /* Let the protocol handle the packet */
1369 sock->protocol->execute(server->timeout_queue, 0,
1370 sock->protocol, sock->sock, 0, 100000);
1372 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1373 "protocol active, packet dropped."));
1375 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1379 case SILC_PACKET_KEY_EXCHANGE_1:
1380 SILC_LOG_DEBUG(("KE 1 packet"));
1381 if (sock->protocol && sock->protocol->protocol->type
1382 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1384 SilcServerKEInternalContext *proto_ctx =
1385 (SilcServerKEInternalContext *)sock->protocol->context;
1387 if (proto_ctx->packet)
1388 silc_packet_context_free(proto_ctx->packet);
1390 proto_ctx->packet = silc_packet_context_dup(packet);
1391 proto_ctx->dest_id_type = packet->src_id_type;
1392 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_type);
1394 /* Let the protocol handle the packet */
1395 sock->protocol->execute(server->timeout_queue, 0,
1396 sock->protocol, sock->sock,
1399 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1400 "protocol active, packet dropped."));
1404 case SILC_PACKET_KEY_EXCHANGE_2:
1405 SILC_LOG_DEBUG(("KE 2 packet"));
1406 if (sock->protocol && sock->protocol->protocol->type
1407 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1409 SilcServerKEInternalContext *proto_ctx =
1410 (SilcServerKEInternalContext *)sock->protocol->context;
1412 if (proto_ctx->packet)
1413 silc_packet_context_free(proto_ctx->packet);
1415 proto_ctx->packet = silc_packet_context_dup(packet);
1416 proto_ctx->dest_id_type = packet->src_id_type;
1417 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_type);
1419 /* Let the protocol handle the packet */
1420 sock->protocol->execute(server->timeout_queue, 0,
1421 sock->protocol, sock->sock,
1424 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
1425 "protocol active, packet dropped."));
1429 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
1430 /* If we receive this packet we will send to the other end information
1431 about our mandatory authentication method for the connection.
1432 This packet maybe received at any time. */
1433 SILC_LOG_DEBUG(("Connection authentication request packet"));
1437 * Connection Authentication protocol packets
1439 case SILC_PACKET_CONNECTION_AUTH:
1440 /* Start of the authentication protocol. We receive here the
1441 authentication data and will verify it. */
1442 SILC_LOG_DEBUG(("Connection auth packet"));
1443 if (sock->protocol && sock->protocol->protocol->type
1444 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
1446 SilcServerConnAuthInternalContext *proto_ctx =
1447 (SilcServerConnAuthInternalContext *)sock->protocol->context;
1449 proto_ctx->packet = silc_packet_context_dup(packet);
1451 /* Let the protocol handle the packet */
1452 sock->protocol->execute(server->timeout_queue, 0,
1453 sock->protocol, sock->sock, 0, 0);
1455 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1456 "protocol active, packet dropped."));
1460 case SILC_PACKET_NEW_ID:
1462 * Received New ID packet. This includes some new ID that has been
1463 * created. It may be for client, server or channel. This is the way
1464 * to distribute information about new registered entities in the
1467 SILC_LOG_DEBUG(("New ID packet"));
1468 silc_server_new_id(server, sock, packet);
1471 case SILC_PACKET_NEW_CLIENT:
1473 * Received new client packet. This includes client information that
1474 * we will use to create initial client ID. After creating new
1475 * ID we will send it to the client.
1477 SILC_LOG_DEBUG(("New Client packet"));
1478 silc_server_new_client(server, sock, packet);
1481 case SILC_PACKET_NEW_SERVER:
1483 * Received new server packet. This includes Server ID and some other
1484 * information that we may save. This is received after server has
1487 SILC_LOG_DEBUG(("New Server packet"));
1488 silc_server_new_server(server, sock, packet);
1491 case SILC_PACKET_NEW_CHANNEL:
1493 * Received new channel packet. Information about new channel in the
1494 * network are distributed using this packet.
1496 SILC_LOG_DEBUG(("New Channel packet"));
1497 silc_server_new_channel(server, sock, packet);
1500 case SILC_PACKET_NEW_CHANNEL_USER:
1502 * Received new channel user packet. Information about new users on a
1503 * channel are distributed between routers using this packet. The
1504 * router receiving this will redistribute it and also sent JOIN notify
1505 * to local clients on the same channel. Normal server sends JOIN notify
1506 * to its local clients on the channel.
1508 SILC_LOG_DEBUG(("New Channel User packet"));
1509 silc_server_new_channel_user(server, sock, packet);
1512 case SILC_PACKET_NEW_CHANNEL_LIST:
1514 * List of new channel packets received. This is usually received when
1515 * existing server or router connects to us and distributes information
1516 * of all channels it has.
1520 case SILC_PACKET_NEW_CHANNEL_USER_LIST:
1522 * List of new channel user packets received. This is usually received
1523 * when existing server or router connects to us and distributes
1524 * information of all channel users it has.
1528 case SILC_PACKET_REPLACE_ID:
1530 * Received replace ID packet. This sends the old ID that is to be
1531 * replaced with the new one included into the packet. Client must not
1534 SILC_LOG_DEBUG(("Replace ID packet"));
1535 silc_server_replace_id(server, sock, packet);
1538 case SILC_PACKET_REMOVE_ID:
1540 * Received remove ID Packet.
1542 SILC_LOG_DEBUG(("Remove ID packet"));
1545 case SILC_PACKET_REMOVE_CHANNEL_USER:
1547 * Received packet to remove user from a channel. Routers notify other
1548 * routers about a user leaving a channel.
1550 SILC_LOG_DEBUG(("Remove Channel User packet"));
1551 silc_server_remove_channel_user(server, sock, packet);
1555 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
1561 /* Closes connection to socket connection */
1563 void silc_server_close_connection(SilcServer server,
1564 SilcSocketConnection sock)
1567 SILC_LOG_DEBUG(("Closing connection %d", sock->sock));
1569 /* We won't listen for this connection anymore */
1570 silc_schedule_unset_listen_fd(sock->sock);
1572 /* Unregister all tasks */
1573 silc_task_unregister_by_fd(server->io_queue, sock->sock);
1574 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
1576 /* Close the actual connection */
1577 silc_net_close_connection(sock->sock);
1578 server->sockets[sock->sock] = NULL;
1579 silc_socket_free(sock);
1582 /* Sends disconnect message to remote connection and disconnects the
1585 void silc_server_disconnect_remote(SilcServer server,
1586 SilcSocketConnection sock,
1587 const char *fmt, ...)
1590 unsigned char buf[4096];
1592 memset(buf, 0, sizeof(buf));
1594 vsprintf(buf, fmt, ap);
1597 SILC_LOG_DEBUG(("Disconnecting remote host"));
1599 /* Notify remote end that the conversation is over. The notify message
1600 is tried to be sent immediately. */
1601 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
1602 buf, strlen(buf), TRUE);
1604 /* Mark the connection to be disconnected */
1605 SILC_SET_DISCONNECTED(sock);
1606 silc_server_close_connection(server, sock);
1609 /* Free's user_data pointer from socket connection object. As this
1610 pointer maybe anything we wil switch here to find the correct
1611 data type and free it the way it needs to be free'd. */
1613 void silc_server_free_sock_user_data(SilcServer server,
1614 SilcSocketConnection sock)
1616 SILC_LOG_DEBUG(("Start"));
1618 switch(sock->type) {
1619 case SILC_SOCKET_TYPE_CLIENT:
1621 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
1623 /* Remove client from all channels */
1624 silc_server_remove_from_channels(server, sock, user_data);
1626 /* XXX must take some info to history before freeing */
1628 /* Free the client entry and everything in it */
1629 silc_idlist_del_data(user_data);
1630 silc_idlist_del_client(server->local_list, user_data);
1633 case SILC_SOCKET_TYPE_SERVER:
1634 case SILC_SOCKET_TYPE_ROUTER:
1642 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
1644 silc_idlist_del_data(user_data);
1645 silc_free(user_data);
1650 sock->user_data = NULL;
1653 /* Removes client from all channels it has joined. This is used when
1654 client connection is disconnected. If the client on a channel
1655 is last, the channel is removed as well. */
1657 void silc_server_remove_from_channels(SilcServer server,
1658 SilcSocketConnection sock,
1659 SilcClientEntry client)
1661 SilcChannelEntry channel;
1662 SilcChannelClientEntry chl;
1663 SilcBuffer chidp, clidp;
1665 SILC_LOG_DEBUG(("Start"));
1667 if (!client || !client->id)
1670 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1672 /* Remove the client from all channels. The client is removed from
1673 the channels' user list. */
1674 silc_list_start(client->channels);
1675 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
1676 channel = chl->channel;
1677 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
1679 /* Remove from list */
1680 silc_list_del(client->channels, chl);
1682 /* If this client is last one on the channel the channel
1683 is removed all together. */
1684 if (silc_list_count(channel->user_list) < 2) {
1686 /* However, if the channel has marked global users then the
1687 channel is not created locally, and this does not remove the
1688 channel globally from SILC network, in this case we will
1689 notify that this client has left the channel. */
1690 if (channel->global_users)
1691 silc_server_send_notify_to_channel(server, channel, TRUE,
1692 SILC_NOTIFY_TYPE_SIGNOFF, 1,
1693 clidp->data, clidp->len);
1695 silc_idlist_del_channel(server->local_list, channel);
1699 /* Remove from list */
1700 silc_list_del(channel->user_list, chl);
1703 /* Send notify to channel about client leaving SILC and thus
1704 the entire channel. */
1705 silc_server_send_notify_to_channel(server, channel, TRUE,
1706 SILC_NOTIFY_TYPE_SIGNOFF, 1,
1707 clidp->data, clidp->len);
1708 silc_buffer_free(chidp);
1711 silc_buffer_free(clidp);
1714 /* Removes client from one channel. This is used for example when client
1715 calls LEAVE command to remove itself from the channel. Returns TRUE
1716 if channel still exists and FALSE if the channel is removed when
1717 last client leaves the channel. If `notify' is FALSE notify messages
1720 int silc_server_remove_from_one_channel(SilcServer server,
1721 SilcSocketConnection sock,
1722 SilcChannelEntry channel,
1723 SilcClientEntry client,
1726 SilcChannelEntry ch;
1727 SilcChannelClientEntry chl;
1730 SILC_LOG_DEBUG(("Start"));
1732 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1734 /* Remove the client from the channel. The client is removed from
1735 the channel's user list. */
1736 silc_list_start(client->channels);
1737 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
1738 if (chl->channel != channel)
1743 /* Remove from list */
1744 silc_list_del(client->channels, chl);
1746 /* If this client is last one on the channel the channel
1747 is removed all together. */
1748 if (silc_list_count(channel->user_list) < 2) {
1749 /* Notify about leaving client if this channel has global users,
1750 ie. the channel is not created locally. */
1751 if (notify && channel->global_users)
1752 silc_server_send_notify_to_channel(server, channel, TRUE,
1753 SILC_NOTIFY_TYPE_LEAVE, 1,
1754 clidp->data, clidp->len);
1756 silc_idlist_del_channel(server->local_list, channel);
1757 silc_buffer_free(clidp);
1761 /* Remove from list */
1762 silc_list_del(channel->user_list, chl);
1765 /* Send notify to channel about client leaving the channel */
1767 silc_server_send_notify_to_channel(server, channel, TRUE,
1768 SILC_NOTIFY_TYPE_LEAVE, 1,
1769 clidp->data, clidp->len);
1773 silc_buffer_free(clidp);
1777 /* Returns TRUE if the given client is on the channel. FALSE if not.
1778 This works because we assure that the user list on the channel is
1779 always in up to date thus we can only check the channel list from
1780 `client' which is faster than checking the user list from `channel'. */
1782 int silc_server_client_on_channel(SilcClientEntry client,
1783 SilcChannelEntry channel)
1785 SilcChannelClientEntry chl;
1787 if (!client || !channel)
1790 silc_list_start(client->channels);
1791 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END)
1792 if (chl->channel == channel)
1798 /* Timeout callback. This is called if connection is idle or for some
1799 other reason is not responding within some period of time. This
1800 disconnects the remote end. */
1802 SILC_TASK_CALLBACK(silc_server_timeout_remote)
1804 SilcServerConnection sconn = (SilcServerConnection)context;
1805 SilcSocketConnection sock = sconn->server->sockets[fd];
1807 silc_server_disconnect_remote(sconn->server, sock,
1808 "Server closed connection: "
1809 "Connection timeout");
1812 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
1813 function may be used only by router. In real SILC network all channels
1814 are created by routers thus this function is never used by normal
1817 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
1818 SilcServerID *router_id,
1822 SilcChannelID *channel_id;
1823 SilcChannelEntry entry;
1826 SILC_LOG_DEBUG(("Creating new channel"));
1831 /* Allocate cipher */
1832 silc_cipher_alloc(cipher, &key);
1834 channel_name = strdup(channel_name);
1836 /* Create the channel */
1837 silc_id_create_channel_id(router_id, server->rng, &channel_id);
1838 entry = silc_idlist_add_channel(server->local_list, channel_name,
1839 SILC_CHANNEL_MODE_NONE, channel_id,
1842 silc_free(channel_name);
1846 /* Now create the actual key material */
1847 silc_server_create_channel_key(server, entry, 16);
1849 /* Notify other routers about the new channel. We send the packet
1850 to our primary route. */
1851 if (server->standalone == FALSE) {
1852 silc_server_send_new_channel(server, server->router->connection, TRUE,
1853 channel_name, entry->id, SILC_ID_CHANNEL_LEN);
1859 /* Generates new channel key. This is used to create the initial channel key
1860 but also to re-generate new key for channel. If `key_len' is provided
1861 it is the bytes of the key length. */
1863 void silc_server_create_channel_key(SilcServer server,
1864 SilcChannelEntry channel,
1865 unsigned int key_len)
1868 unsigned char channel_key[32];
1873 else if (channel->key_len)
1874 len = channel->key_len / 8;
1878 /* Create channel key */
1879 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
1882 channel->channel_key->cipher->set_key(channel->channel_key->context,
1885 /* Remove old key if exists */
1887 memset(channel->key, 0, channel->key_len / 8);
1888 silc_free(channel->key);
1892 channel->key_len = len * 8;
1893 channel->key = silc_calloc(len, sizeof(*channel->key));
1894 memcpy(channel->key, channel_key, len);
1895 memset(channel_key, 0, sizeof(channel_key));