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)
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);
99 silc_math_primegen_uninit(); /* XXX */
104 /* Initializes the entire SILC server. This is called always before running
105 the server. This is called only once at the initialization of the program.
106 This binds the server to its listenning port. After this function returns
107 one should call silc_server_run to start the server. This returns TRUE
108 when everything is ok to run the server. Configuration file must be
109 read and parsed before calling this. */
111 int silc_server_init(SilcServer server)
113 int *sock = NULL, sock_count = 0, i;
115 SilcServerEntry id_entry;
117 SILC_LOG_DEBUG(("Initializing server"));
119 assert(server->config);
121 /* XXX After server is made as Silc Server Library this can be given
122 as argument, for now this is hard coded */
123 server->params = silc_calloc(1, sizeof(*server->params));
124 server->params->retry_count = SILC_SERVER_RETRY_COUNT;
125 server->params->retry_interval_min = SILC_SERVER_RETRY_INTERVAL_MIN;
126 server->params->retry_interval_max = SILC_SERVER_RETRY_INTERVAL_MAX;
127 server->params->retry_keep_trying = FALSE;
128 server->params->protocol_timeout = 60;
129 server->params->require_reverse_mapping = FALSE;
131 /* Set log files where log message should be saved. */
132 server->config->server = server;
133 silc_config_server_setlogfiles(server->config);
135 /* Register all configured ciphers, PKCS and hash functions. */
136 silc_config_server_register_ciphers(server->config);
137 silc_config_server_register_pkcs(server->config);
138 silc_config_server_register_hashfuncs(server->config);
140 /* Initialize random number generator for the server. */
141 server->rng = silc_rng_alloc();
142 silc_rng_init(server->rng);
143 silc_math_primegen_init(); /* XXX */
145 /* Initialize hash functions for server to use */
146 silc_hash_alloc("md5", &server->md5hash);
147 silc_hash_alloc("sha1", &server->sha1hash);
149 /* Initialize none cipher */
150 silc_cipher_alloc("none", &server->none_cipher);
152 /* XXXXX Generate RSA key pair */
154 unsigned char *public_key;
155 unsigned char *private_key;
156 unsigned int pk_len, prv_len;
159 if (stat("pubkey.pub", &st) < 0 && stat("privkey.prv", &st) < 0) {
161 if (silc_pkcs_alloc("rsa", &server->pkcs) == FALSE) {
162 SILC_LOG_ERROR(("Could not create RSA key pair"));
166 if (server->pkcs->pkcs->init(server->pkcs->context,
167 1024, server->rng) == FALSE) {
168 SILC_LOG_ERROR(("Could not generate RSA key pair"));
172 public_key = server->pkcs->pkcs->get_public_key(server->pkcs->context,
174 private_key = server->pkcs->pkcs->get_private_key(server->pkcs->context,
177 SILC_LOG_HEXDUMP(("public key"), public_key, pk_len);
178 SILC_LOG_HEXDUMP(("private key"), private_key, prv_len);
181 silc_pkcs_public_key_alloc("rsa", "UN=root, HN=dummy",
183 server->private_key =
184 silc_pkcs_private_key_alloc("rsa", private_key, prv_len);
187 silc_pkcs_save_public_key("pubkey.pub", server->public_key,
189 silc_pkcs_save_private_key("privkey.prv", server->private_key, NULL,
192 memset(public_key, 0, pk_len);
193 memset(private_key, 0, prv_len);
194 silc_free(public_key);
195 silc_free(private_key);
197 silc_pkcs_load_public_key("pubkey.pub", &server->public_key,
199 silc_pkcs_load_private_key("privkey.prv", &server->private_key,
204 /* Create a listening server. Note that our server can listen on
205 multiple ports. All listeners are created here and now. */
206 /* XXX Still check this whether to use server_info or listen_port. */
208 while(server->config->listen_port) {
211 tmp = silc_net_create_server(server->config->listen_port->port,
212 server->config->listen_port->host);
216 sock = silc_realloc(sock, (sizeof(int *) * (sock_count + 1)));
217 sock[sock_count] = tmp;
218 server->config->listen_port = server->config->listen_port->next;
222 /* Initialize ID caches */
223 server->local_list->clients = silc_idcache_alloc(0);
224 server->local_list->servers = silc_idcache_alloc(0);
225 server->local_list->channels = silc_idcache_alloc(0);
227 /* These are allocated for normal server as well as these hold some
228 global information that the server has fetched from its router. For
229 router these are used as they are supposed to be used on router. */
230 server->global_list->clients = silc_idcache_alloc(0);
231 server->global_list->servers = silc_idcache_alloc(0);
232 server->global_list->channels = silc_idcache_alloc(0);
234 /* Allocate the entire socket list that is used in server. Eventually
235 all connections will have entry in this table (it is a table of
236 pointers to the actual object that is allocated individually
238 server->sockets = silc_calloc(SILC_SERVER_MAX_CONNECTIONS,
239 sizeof(*server->sockets));
241 for (i = 0; i < sock_count; i++) {
242 SilcSocketConnection newsocket = NULL;
244 /* Set socket to non-blocking mode */
245 silc_net_set_socket_nonblock(sock[i]);
246 server->sock = sock[i];
248 /* Create a Server ID for the server. */
249 silc_id_create_server_id(sock[i], server->rng, &id);
255 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
256 server->id_string_len = silc_id_get_len(SILC_ID_SERVER);
257 server->id_type = SILC_ID_SERVER;
258 server->server_name = server->config->server_info->server_name;
260 /* Add ourselves to the server list. We don't have a router yet
261 beacuse we haven't established a route yet. It will be done later.
262 For now, NULL is sent as router. This allocates new entry to
265 silc_idlist_add_server(server->local_list,
266 server->config->server_info->server_name,
267 server->server_type, server->id, NULL, NULL);
269 SILC_LOG_ERROR(("Could not add ourselves to cache"));
273 /* Add ourselves also to the socket table. The entry allocated above
274 is sent as argument for fast referencing in the future. */
275 silc_socket_alloc(sock[i], SILC_SOCKET_TYPE_SERVER, id_entry,
280 server->sockets[sock[i]] = newsocket;
282 /* Put the allocated socket pointer also to the entry allocated above
283 for fast back-referencing to the socket list. */
284 id_entry->connection = (void *)server->sockets[sock[i]];
285 server->id_entry = id_entry;
288 /* Register the task queues. In SILC we have by default three task queues.
289 One task queue for non-timeout tasks which perform different kind of
290 I/O on file descriptors, timeout task queue for timeout tasks, and,
291 generic non-timeout task queue whose tasks apply to all connections. */
292 silc_task_queue_alloc(&server->io_queue, TRUE);
293 if (!server->io_queue) {
296 silc_task_queue_alloc(&server->timeout_queue, TRUE);
297 if (!server->timeout_queue) {
300 silc_task_queue_alloc(&server->generic_queue, TRUE);
301 if (!server->generic_queue) {
305 /* Register protocols */
306 silc_server_protocols_register();
308 /* Initialize the scheduler */
309 silc_schedule_init(&server->io_queue, &server->timeout_queue,
310 &server->generic_queue,
311 SILC_SERVER_MAX_CONNECTIONS);
313 /* Add the first task to the queue. This is task that is executed by
314 timeout. It expires as soon as the caller calls silc_server_run. This
315 task performs authentication protocol and key exchange with our
317 silc_task_register(server->timeout_queue, sock[0],
318 silc_server_connect_to_router,
319 (void *)server, 0, 1,
321 SILC_TASK_PRI_NORMAL);
323 /* Add listener task to the queue. This task receives new connections to the
324 server. This task remains on the queue until the end of the program. */
325 silc_task_register(server->io_queue, sock[0],
326 silc_server_accept_new_connection,
327 (void *)server, 0, 0,
329 SILC_TASK_PRI_NORMAL);
330 server->listenning = TRUE;
332 /* If server connections has been configured then we must be router as
333 normal server cannot have server connections, only router connections. */
334 if (server->config->servers)
335 server->server_type = SILC_ROUTER;
337 SILC_LOG_DEBUG(("Server initialized"));
339 /* We are done here, return succesfully */
342 silc_task_queue_free(server->timeout_queue);
344 silc_task_queue_free(server->io_queue);
346 for (i = 0; i < sock_count; i++)
347 silc_net_close_server(sock[i]);
352 /* Stops the SILC server. This function is used to shutdown the server.
353 This is usually called after the scheduler has returned. After stopping
354 the server one should call silc_server_free. */
356 void silc_server_stop(SilcServer server)
358 SILC_LOG_DEBUG(("Stopping server"));
360 /* Stop the scheduler, although it might be already stopped. This
361 doesn't hurt anyone. This removes all the tasks and task queues,
363 silc_schedule_stop();
364 silc_schedule_uninit();
366 silc_server_protocols_unregister();
368 SILC_LOG_DEBUG(("Server stopped"));
371 /* The heart of the server. This runs the scheduler thus runs the server.
372 When this returns the server has been stopped and the program will
375 void silc_server_run(SilcServer server)
377 SILC_LOG_DEBUG(("Running server"));
379 /* Start the scheduler, the heart of the SILC server. When this returns
380 the program will be terminated. */
384 /* Timeout callback that will be called to retry connecting to remote
385 router. This is used by both normal and router server. This will wait
386 before retrying the connecting. The timeout is generated by exponential
387 backoff algorithm. */
389 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
391 SilcServerConnection sconn = (SilcServerConnection)context;
392 SilcServer server = sconn->server;
394 SILC_LOG_INFO(("Retrying connecting to a router"));
396 /* Calculate next timeout */
397 if (sconn->retry_count >= 1) {
398 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
399 if (sconn->retry_timeout > SILC_SERVER_RETRY_INTERVAL_MAX)
400 sconn->retry_timeout = SILC_SERVER_RETRY_INTERVAL_MAX;
402 sconn->retry_timeout = server->params->retry_interval_min;
404 sconn->retry_count++;
405 sconn->retry_timeout = sconn->retry_timeout +
406 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
408 /* If we've reached max retry count, give up. */
409 if (sconn->retry_count > server->params->retry_count &&
410 server->params->retry_keep_trying == FALSE) {
411 SILC_LOG_ERROR(("Could not connect to router, giving up"));
415 /* Wait one before retrying */
416 silc_task_register(server->timeout_queue, fd, silc_server_connect_router,
417 context, sconn->retry_timeout,
418 server->params->retry_interval_min_usec,
419 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
422 /* Generic routine to use connect to a router. */
424 SILC_TASK_CALLBACK(silc_server_connect_router)
426 SilcServerConnection sconn = (SilcServerConnection)context;
427 SilcServer server = sconn->server;
428 SilcSocketConnection newsocket;
429 SilcProtocol protocol;
430 SilcServerKEInternalContext *proto_ctx;
433 /* Connect to remote host */
434 sock = silc_net_create_connection(sconn->remote_port,
437 SILC_LOG_ERROR(("Could not connect to router"));
438 silc_task_register(server->timeout_queue, fd,
439 silc_server_connect_to_router_retry,
440 context, 0, 1, SILC_TASK_TIMEOUT,
441 SILC_TASK_PRI_NORMAL);
445 /* Set socket options */
446 silc_net_set_socket_nonblock(sock);
447 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
449 /* Create socket connection for the connection. Even though we
450 know that we are connecting to a router we will mark the socket
451 to be unknown connection until we have executed authentication
453 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
454 server->sockets[sock] = newsocket;
455 newsocket->hostname = sconn->remote_host;
456 newsocket->port = sconn->remote_port;
457 sconn->sock = newsocket;
459 /* Allocate internal protocol context. This is sent as context
461 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
462 proto_ctx->server = (void *)server;
463 proto_ctx->context = (void *)sconn;
464 proto_ctx->sock = newsocket;
465 proto_ctx->rng = server->rng;
466 proto_ctx->responder = FALSE;
468 /* Perform key exchange protocol. silc_server_connect_to_router_second
469 will be called after the protocol is finished. */
470 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
471 &protocol, proto_ctx,
472 silc_server_connect_to_router_second);
473 newsocket->protocol = protocol;
475 /* Register a timeout task that will be executed if the protocol
476 is not executed within set limit. */
477 proto_ctx->timeout_task =
478 silc_task_register(server->timeout_queue, sock,
479 silc_server_timeout_remote,
480 server, server->params->protocol_timeout,
481 server->params->protocol_timeout_usec,
485 /* Register the connection for network input and output. This sets
486 that scheduler will listen for incoming packets for this connection
487 and sets that outgoing packets may be sent to this connection as
488 well. However, this doesn't set the scheduler for outgoing traffic,
489 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
490 later when outgoing data is available. */
491 context = (void *)server;
492 SILC_REGISTER_CONNECTION_FOR_IO(sock);
494 /* Run the protocol */
495 protocol->execute(server->timeout_queue, 0, protocol, sock, 0, 0);
498 /* This function connects to our primary router or if we are a router this
499 establishes all our primary routes. This is called at the start of the
500 server to do authentication and key exchange with our router - called
503 SILC_TASK_CALLBACK(silc_server_connect_to_router)
505 SilcServer server = (SilcServer)context;
506 SilcServerConnection sconn;
508 SILC_LOG_DEBUG(("Connecting to router(s)"));
510 /* If we are normal SILC server we need to connect to our cell's
512 if (server->server_type == SILC_SERVER) {
513 SILC_LOG_DEBUG(("We are normal server"));
515 /* Create connection to the router, if configured. */
516 if (server->config->routers) {
518 /* Allocate connection object for hold connection specific stuff. */
519 sconn = silc_calloc(1, sizeof(*sconn));
520 sconn->server = server;
521 sconn->remote_host = server->config->routers->host;
522 sconn->remote_port = server->config->routers->port;
524 silc_task_register(server->timeout_queue, fd,
525 silc_server_connect_router,
526 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
527 SILC_TASK_PRI_NORMAL);
532 /* If we are a SILC router we need to establish all of our primary
534 if (server->server_type == SILC_ROUTER) {
535 SilcConfigServerSectionServerConnection *ptr;
537 SILC_LOG_DEBUG(("We are router"));
539 /* Create the connections to all our routes */
540 ptr = server->config->routers;
543 SILC_LOG_DEBUG(("Router connection [%s] %s:%d",
544 ptr->initiator ? "Initiator" : "Responder",
545 ptr->host, ptr->port));
547 if (ptr->initiator) {
548 /* Allocate connection object for hold connection specific stuff. */
549 sconn = silc_calloc(1, sizeof(*sconn));
550 sconn->server = server;
551 sconn->remote_host = ptr->host;
552 sconn->remote_port = ptr->port;
554 silc_task_register(server->timeout_queue, fd,
555 silc_server_connect_router,
556 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
557 SILC_TASK_PRI_NORMAL);
567 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
569 /* There wasn't a configured router, we will continue but we don't
570 have a connection to outside world. We will be standalone server. */
571 server->standalone = TRUE;
574 /* Second part of connecting to router(s). Key exchange protocol has been
575 executed and now we will execute authentication protocol. */
577 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
579 SilcProtocol protocol = (SilcProtocol)context;
580 SilcServerKEInternalContext *ctx =
581 (SilcServerKEInternalContext *)protocol->context;
582 SilcServer server = (SilcServer)ctx->server;
583 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
584 SilcSocketConnection sock = NULL;
585 SilcServerConnAuthInternalContext *proto_ctx;
587 SILC_LOG_DEBUG(("Start"));
589 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
590 /* Error occured during protocol */
591 silc_protocol_free(protocol);
593 silc_packet_context_free(ctx->packet);
595 silc_ske_free(ctx->ske);
597 silc_free(ctx->dest_id);
599 sock->protocol = NULL;
600 silc_server_disconnect_remote(server, sock, "Server closed connection: "
601 "Key exchange failed");
605 /* Allocate internal context for the authentication protocol. This
606 is sent as context for the protocol. */
607 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
608 proto_ctx->server = (void *)server;
609 proto_ctx->context = (void *)sconn;
610 proto_ctx->sock = sock = server->sockets[fd];
611 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
612 proto_ctx->dest_id_type = ctx->dest_id_type;
613 proto_ctx->dest_id = ctx->dest_id;
615 /* Resolve the authentication method used in this connection */
616 proto_ctx->auth_meth = SILC_PROTOCOL_CONN_AUTH_PASSWORD;
617 if (server->config->routers) {
618 SilcConfigServerSectionServerConnection *conn = NULL;
620 /* Check if we find a match from user configured connections */
621 conn = silc_config_server_find_router_conn(server->config,
625 /* Match found. Use the configured authentication method */
626 proto_ctx->auth_meth = conn->auth_meth;
627 if (conn->auth_data) {
628 proto_ctx->auth_data = strdup(conn->auth_data);
629 proto_ctx->auth_data_len = strlen(conn->auth_data);
632 /* No match found. */
639 /* Free old protocol as it is finished now */
640 silc_protocol_free(protocol);
642 silc_packet_context_free(ctx->packet);
644 sock->protocol = NULL;
646 /* Allocate the authentication protocol. This is allocated here
647 but we won't start it yet. We will be receiving party of this
648 protocol thus we will wait that connecting party will make
650 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
651 &sock->protocol, proto_ctx,
652 silc_server_connect_to_router_final);
654 /* Register timeout task. If the protocol is not executed inside
655 this timelimit the connection will be terminated. Currently
656 this is 15 seconds and is hard coded limit (XXX). */
657 proto_ctx->timeout_task =
658 silc_task_register(server->timeout_queue, sock->sock,
659 silc_server_timeout_remote,
660 (void *)server, 15, 0,
664 /* Run the protocol */
665 sock->protocol->execute(server->timeout_queue, 0,
666 sock->protocol, sock->sock, 0, 0);
669 /* Finalizes the connection to router. Registers a server task to the
670 queue so that we can accept new connections. */
672 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
674 SilcProtocol protocol = (SilcProtocol)context;
675 SilcServerConnAuthInternalContext *ctx =
676 (SilcServerConnAuthInternalContext *)protocol->context;
677 SilcServer server = (SilcServer)ctx->server;
678 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
679 SilcSocketConnection sock = ctx->sock;
680 SilcServerEntry id_entry;
682 unsigned char *id_string;
684 SILC_LOG_DEBUG(("Start"));
686 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
687 /* Error occured during protocol */
689 silc_free(ctx->dest_id);
690 silc_server_disconnect_remote(server, sock, "Server closed connection: "
691 "Authentication failed");
695 /* Add a task to the queue. This task receives new connections to the
696 server. This task remains on the queue until the end of the program. */
697 if (!server->listenning) {
698 silc_task_register(server->io_queue, server->sock,
699 silc_server_accept_new_connection,
700 (void *)server, 0, 0,
702 SILC_TASK_PRI_NORMAL);
703 server->listenning = TRUE;
706 /* Send NEW_SERVER packet to the router. We will become registered
707 to the SILC network after sending this packet. */
708 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
709 packet = silc_buffer_alloc(2 + 2 + SILC_ID_SERVER_LEN +
710 strlen(server->server_name));
711 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
712 silc_buffer_format(packet,
713 SILC_STR_UI_SHORT(SILC_ID_SERVER_LEN),
714 SILC_STR_UI_XNSTRING(id_string, SILC_ID_SERVER_LEN),
715 SILC_STR_UI_SHORT(strlen(server->server_name)),
716 SILC_STR_UI_XNSTRING(server->server_name,
717 strlen(server->server_name)),
720 /* Send the packet */
721 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
722 packet->data, packet->len, TRUE);
723 silc_buffer_free(packet);
724 silc_free(id_string);
726 SILC_LOG_DEBUG(("Connected to router %s", sock->hostname));
728 /* Add the connected router to local server list */
729 server->standalone = FALSE;
730 id_entry = silc_idlist_add_server(server->local_list, sock->hostname,
731 SILC_ROUTER, ctx->dest_id, NULL, sock);
734 silc_free(ctx->dest_id);
735 silc_server_disconnect_remote(server, sock, "Server closed connection: "
736 "Authentication failed");
740 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
741 silc_free(sock->user_data);
742 sock->user_data = (void *)id_entry;
743 sock->type = SILC_SOCKET_TYPE_ROUTER;
744 server->id_entry->router = id_entry;
745 server->router = id_entry;
746 server->router->data.registered = TRUE;
749 /* Free the temporary connection data context */
753 /* Free the protocol object */
754 silc_protocol_free(protocol);
756 silc_packet_context_free(ctx->packet);
758 silc_ske_free(ctx->ske);
760 sock->protocol = NULL;
763 /* Accepts new connections to the server. Accepting new connections are
764 done in three parts to make it async. */
766 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
768 SilcServer server = (SilcServer)context;
769 SilcSocketConnection newsocket;
770 SilcServerKEInternalContext *proto_ctx;
773 SILC_LOG_DEBUG(("Accepting new connection"));
775 sock = silc_net_accept_connection(server->sock);
777 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
781 /* Check max connections */
782 if (sock > SILC_SERVER_MAX_CONNECTIONS) {
783 if (server->config->redirect) {
784 /* XXX Redirecting connection to somewhere else now?? */
785 /*silc_server_send_notify("Server is full, trying to redirect..."); */
787 SILC_LOG_ERROR(("Refusing connection, server is full"));
792 /* Set socket options */
793 silc_net_set_socket_nonblock(sock);
794 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
796 /* We don't create a ID yet, since we don't know what type of connection
797 this is yet. But, we do add the connection to the socket table. */
798 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
799 server->sockets[sock] = newsocket;
801 /* XXX This MUST be done async as this will block the entire server
802 process. Either we have to do our own resolver stuff or in the future
803 we can use threads. */
804 /* Perform name and address lookups for the remote host. */
805 silc_net_check_host_by_sock(sock, &newsocket->hostname, &newsocket->ip);
806 if ((server->params->require_reverse_mapping && !newsocket->hostname) ||
808 SILC_LOG_ERROR(("IP/DNS lookup failed"));
811 if (!newsocket->hostname)
812 newsocket->hostname = strdup(newsocket->ip);
814 SILC_LOG_INFO(("Incoming connection from %s (%s)", newsocket->hostname,
817 /* Allocate internal context for key exchange protocol. This is
818 sent as context for the protocol. */
819 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
820 proto_ctx->server = context;
821 proto_ctx->sock = newsocket;
822 proto_ctx->rng = server->rng;
823 proto_ctx->responder = TRUE;
825 /* Prepare the connection for key exchange protocol. We allocate the
826 protocol but will not start it yet. The connector will be the
827 initiator of the protocol thus we will wait for initiation from
828 there before we start the protocol. */
829 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
830 &newsocket->protocol, proto_ctx,
831 silc_server_accept_new_connection_second);
833 /* Register a timeout task that will be executed if the connector
834 will not start the key exchange protocol within 60 seconds. For
835 now, this is a hard coded limit. After 60 secs the connection will
836 be closed if the key exchange protocol has not been started. */
837 proto_ctx->timeout_task =
838 silc_task_register(server->timeout_queue, newsocket->sock,
839 silc_server_timeout_remote,
844 /* Register the connection for network input and output. This sets
845 that scheduler will listen for incoming packets for this connection
846 and sets that outgoing packets may be sent to this connection as well.
847 However, this doesn't set the scheduler for outgoing traffic, it
848 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
849 later when outgoing data is available. */
850 SILC_REGISTER_CONNECTION_FOR_IO(sock);
853 /* Second part of accepting new connection. Key exchange protocol has been
854 performed and now it is time to do little connection authentication
855 protocol to figure out whether this connection is client or server
856 and whether it has right to access this server (especially server
857 connections needs to be authenticated). */
859 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
861 SilcProtocol protocol = (SilcProtocol)context;
862 SilcServerKEInternalContext *ctx =
863 (SilcServerKEInternalContext *)protocol->context;
864 SilcServer server = (SilcServer)ctx->server;
865 SilcSocketConnection sock = NULL;
866 SilcServerConnAuthInternalContext *proto_ctx;
868 SILC_LOG_DEBUG(("Start"));
870 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
871 /* Error occured during protocol */
872 silc_protocol_free(protocol);
874 silc_packet_context_free(ctx->packet);
876 silc_ske_free(ctx->ske);
878 silc_free(ctx->dest_id);
881 sock->protocol = NULL;
882 silc_server_disconnect_remote(server, sock, "Server closed connection: "
883 "Key exchange failed");
887 /* Allocate internal context for the authentication protocol. This
888 is sent as context for the protocol. */
889 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
890 proto_ctx->server = (void *)server;
891 proto_ctx->sock = sock = server->sockets[fd];
892 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
893 proto_ctx->responder = TRUE;
894 proto_ctx->dest_id_type = ctx->dest_id_type;
895 proto_ctx->dest_id = ctx->dest_id;
897 /* Free old protocol as it is finished now */
898 silc_protocol_free(protocol);
900 silc_packet_context_free(ctx->packet);
902 sock->protocol = NULL;
904 /* Allocate the authentication protocol. This is allocated here
905 but we won't start it yet. We will be receiving party of this
906 protocol thus we will wait that connecting party will make
908 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
909 &sock->protocol, proto_ctx,
910 silc_server_accept_new_connection_final);
912 /* Register timeout task. If the protocol is not executed inside
913 this timelimit the connection will be terminated. Currently
914 this is 60 seconds and is hard coded limit (XXX). */
915 proto_ctx->timeout_task =
916 silc_task_register(server->timeout_queue, sock->sock,
917 silc_server_timeout_remote,
918 (void *)server, 60, 0,
923 /* Final part of accepting new connection. The connection has now
924 been authenticated and keys has been exchanged. We also know whether
925 this is client or server connection. */
927 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
929 SilcProtocol protocol = (SilcProtocol)context;
930 SilcServerConnAuthInternalContext *ctx =
931 (SilcServerConnAuthInternalContext *)protocol->context;
932 SilcServer server = (SilcServer)ctx->server;
933 SilcSocketConnection sock = ctx->sock;
934 void *id_entry = NULL;
936 SILC_LOG_DEBUG(("Start"));
938 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
939 /* Error occured during protocol */
940 silc_protocol_free(protocol);
942 silc_packet_context_free(ctx->packet);
944 silc_ske_free(ctx->ske);
946 silc_free(ctx->dest_id);
949 sock->protocol = NULL;
950 silc_server_disconnect_remote(server, sock, "Server closed connection: "
951 "Authentication failed");
955 sock->type = ctx->conn_type;
957 case SILC_SOCKET_TYPE_CLIENT:
959 SilcClientEntry client;
961 SILC_LOG_DEBUG(("Remote host is client"));
962 SILC_LOG_INFO(("Connection from %s (%s) is client", sock->hostname,
965 /* Add the client to the client ID cache. The nickname and Client ID
966 and other information is created after we have received NEW_CLIENT
967 packet from client. */
968 client = silc_idlist_add_client(server->local_list,
969 NULL, NULL, NULL, NULL, NULL, sock);
971 SILC_LOG_ERROR(("Could not add new client to cache"));
972 silc_free(sock->user_data);
976 id_entry = (void *)client;
979 case SILC_SOCKET_TYPE_SERVER:
980 case SILC_SOCKET_TYPE_ROUTER:
982 SilcServerEntry new_server;
984 SILC_LOG_DEBUG(("Remote host is %s",
985 sock->type == SILC_SOCKET_TYPE_SERVER ?
986 "server" : "router"));
987 SILC_LOG_INFO(("Connection from %s (%s) is %s", sock->hostname,
988 sock->ip, sock->type == SILC_SOCKET_TYPE_SERVER ?
989 "server" : "router"));
991 /* Add the server into server cache. The server name and Server ID
992 is updated after we have received NEW_SERVER packet from the
993 server. We mark ourselves as router for this server if we really
996 silc_idlist_add_server(server->local_list, NULL,
997 sock->type == SILC_SOCKET_TYPE_SERVER ?
998 SILC_SERVER : SILC_ROUTER, NULL,
999 sock->type == SILC_SOCKET_TYPE_SERVER ?
1000 server->id_entry : NULL, sock);
1002 SILC_LOG_ERROR(("Could not add new server to cache"));
1003 silc_free(sock->user_data);
1007 id_entry = (void *)new_server;
1009 /* There is connection to other server now, if it is router then
1010 we will have connection to outside world. If we are router but
1011 normal server connected to us then we will remain standalone,
1012 if we are standlone. */
1013 if (server->standalone && sock->type == SILC_SOCKET_TYPE_ROUTER) {
1014 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1015 server->standalone = FALSE;
1016 if (!server->id_entry->router) {
1017 server->id_entry->router = id_entry;
1018 server->router = id_entry;
1027 /* Add the common data structure to the ID entry. */
1029 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1031 /* Add to sockets internal pointer for fast referencing */
1032 silc_free(sock->user_data);
1033 sock->user_data = id_entry;
1035 /* Connection has been fully established now. Everything is ok. */
1036 SILC_LOG_DEBUG(("New connection authenticated"));
1038 silc_protocol_free(protocol);
1040 silc_packet_context_free(ctx->packet);
1042 silc_ske_free(ctx->ske);
1044 silc_free(ctx->dest_id);
1046 sock->protocol = NULL;
1049 /* This function is used to read packets from network and send packets to
1050 network. This is usually a generic task. */
1052 SILC_TASK_CALLBACK(silc_server_packet_process)
1054 SilcServer server = (SilcServer)context;
1055 SilcSocketConnection sock = server->sockets[fd];
1056 SilcIDListData idata;
1057 SilcCipher cipher = NULL;
1058 SilcHmac hmac = NULL;
1064 SILC_LOG_DEBUG(("Processing packet"));
1066 /* Packet sending */
1068 if (type == SILC_TASK_WRITE) {
1069 if (sock->outbuf->data - sock->outbuf->head)
1070 silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1072 ret = silc_server_packet_send_real(server, sock, TRUE);
1074 /* If returned -2 could not write to connection now, will do
1079 /* The packet has been sent and now it is time to set the connection
1080 back to only for input. When there is again some outgoing data
1081 available for this connection it will be set for output as well.
1082 This call clears the output setting and sets it only for input. */
1083 SILC_SET_CONNECTION_FOR_INPUT(fd);
1084 SILC_UNSET_OUTBUF_PENDING(sock);
1086 silc_buffer_clear(sock->outbuf);
1090 /* Packet receiving */
1092 /* Read some data from connection */
1093 ret = silc_packet_receive(sock);
1099 SILC_LOG_DEBUG(("Read EOF"));
1101 /* If connection is disconnecting already we will finally
1102 close the connection */
1103 if (SILC_IS_DISCONNECTING(sock)) {
1104 if (sock->user_data)
1105 silc_server_free_sock_user_data(server, sock);
1106 silc_server_close_connection(server, sock);
1110 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1112 if (sock->user_data)
1113 silc_server_free_sock_user_data(server, sock);
1114 silc_server_close_connection(server, sock);
1118 /* If connection is disconnecting or disconnected we will ignore
1120 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1121 SILC_LOG_DEBUG(("Ignoring read data from invalid connection"));
1125 /* Get keys and stuff from ID entry */
1126 idata = (SilcIDListData)sock->user_data;
1128 idata->last_receive = time(NULL);
1129 cipher = idata->receive_key;
1133 /* Process the packet. This will call the parser that will then
1134 decrypt and parse the packet. */
1135 silc_packet_receive_process(sock, cipher, hmac, silc_server_packet_parse,
1139 /* Parses whole packet, received earlier. */
1141 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1143 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1144 SilcServer server = (SilcServer)parse_ctx->context;
1145 SilcSocketConnection sock = parse_ctx->sock;
1146 SilcPacketContext *packet = parse_ctx->packet;
1149 SILC_LOG_DEBUG(("Start"));
1151 /* Decrypt the received packet */
1152 ret = silc_packet_decrypt(parse_ctx->cipher, parse_ctx->hmac,
1153 packet->buffer, packet);
1158 /* Parse the packet. Packet type is returned. */
1159 ret = silc_packet_parse(packet);
1161 /* Parse the packet header in special way as this is "special"
1163 ret = silc_packet_parse_special(packet);
1166 if (ret == SILC_PACKET_NONE)
1169 if (server->server_type == SILC_ROUTER) {
1170 /* Route the packet if it is not destined to us. Other ID types but
1171 server are handled separately after processing them. */
1172 if (packet->dst_id_type == SILC_ID_SERVER &&
1173 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1174 SILC_ID_SERVER_COMPARE(packet->dst_id, server->id_string)) {
1176 /* Route the packet to fastest route for the destination ID */
1177 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_type);
1178 silc_server_packet_route(server,
1179 silc_server_route_get(server, id,
1180 packet->dst_id_type),
1186 /* Broadcast packet if it is marked as broadcast packet and it is
1187 originated from router and we are router. */
1188 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1189 packet->flags & SILC_PACKET_FLAG_BROADCAST) {
1190 silc_server_packet_broadcast(server, server->router->connection, packet);
1194 /* Parse the incoming packet type */
1195 silc_server_packet_parse_type(server, sock, packet);
1198 silc_buffer_clear(sock->inbuf);
1199 silc_packet_context_free(packet);
1200 silc_free(parse_ctx);
1203 /* Parser callback called by silc_packet_receive_process. This merely
1204 registers timeout that will handle the actual parsing when appropriate. */
1206 void silc_server_packet_parse(SilcPacketParserContext *parser_context)
1208 SilcServer server = (SilcServer)parser_context->context;
1209 SilcSocketConnection sock = parser_context->sock;
1211 switch (sock->type) {
1212 case SILC_SOCKET_TYPE_CLIENT:
1213 case SILC_SOCKET_TYPE_UNKNOWN:
1214 /* Parse the packet with timeout */
1215 silc_task_register(server->timeout_queue, sock->sock,
1216 silc_server_packet_parse_real,
1217 (void *)parser_context, 0, 100000,
1219 SILC_TASK_PRI_NORMAL);
1221 case SILC_SOCKET_TYPE_SERVER:
1222 case SILC_SOCKET_TYPE_ROUTER:
1223 /* Packets from servers are parsed as soon as possible */
1224 silc_task_register(server->timeout_queue, sock->sock,
1225 silc_server_packet_parse_real,
1226 (void *)parser_context, 0, 1,
1228 SILC_TASK_PRI_NORMAL);
1235 /* Parses the packet type and calls what ever routines the packet type
1236 requires. This is done for all incoming packets. */
1238 void silc_server_packet_parse_type(SilcServer server,
1239 SilcSocketConnection sock,
1240 SilcPacketContext *packet)
1242 SilcPacketType type = packet->type;
1244 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1246 /* Parse the packet type */
1248 case SILC_PACKET_DISCONNECT:
1249 SILC_LOG_DEBUG(("Disconnect packet"));
1252 case SILC_PACKET_SUCCESS:
1254 * Success received for something. For now we can have only
1255 * one protocol for connection executing at once hence this
1256 * success message is for whatever protocol is executing currently.
1258 SILC_LOG_DEBUG(("Success packet"));
1259 if (sock->protocol) {
1260 sock->protocol->execute(server->timeout_queue, 0,
1261 sock->protocol, sock->sock, 0, 0);
1265 case SILC_PACKET_FAILURE:
1267 * Failure received for something. For now we can have only
1268 * one protocol for connection executing at once hence this
1269 * failure message is for whatever protocol is executing currently.
1271 SILC_LOG_DEBUG(("Failure packet"));
1272 if (sock->protocol) {
1273 /* XXX Audit the failure type */
1274 sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
1275 sock->protocol->execute(server->timeout_queue, 0,
1276 sock->protocol, sock->sock, 0, 0);
1280 case SILC_PACKET_REJECT:
1281 SILC_LOG_DEBUG(("Reject packet"));
1285 case SILC_PACKET_NOTIFY:
1287 * Received notify packet. Server can receive notify packets from
1288 * router. Server then relays the notify messages to clients if needed.
1290 SILC_LOG_DEBUG(("Notify packet"));
1291 silc_server_notify(server, sock, packet);
1297 case SILC_PACKET_CHANNEL_MESSAGE:
1299 * Received channel message. Channel messages are special packets
1300 * (although probably most common ones) thus they are handled
1303 SILC_LOG_DEBUG(("Channel Message packet"));
1304 silc_server_channel_message(server, sock, packet);
1307 case SILC_PACKET_CHANNEL_KEY:
1309 * Received key for channel. As channels are created by the router
1310 * the keys are as well. We will distribute the key to all of our
1311 * locally connected clients on the particular channel. Router
1312 * never receives this channel and thus is ignored.
1314 SILC_LOG_DEBUG(("Channel Key packet"));
1315 silc_server_channel_key(server, sock, packet);
1321 case SILC_PACKET_COMMAND:
1323 * Recived command. Processes the command request and allocates the
1324 * command context and calls the command.
1326 SILC_LOG_DEBUG(("Command packet"));
1327 silc_server_command_process(server, sock, packet);
1330 case SILC_PACKET_COMMAND_REPLY:
1332 * Received command reply packet. Received command reply to command. It
1333 * may be reply to command sent by us or reply to command sent by client
1334 * that we've routed further.
1336 SILC_LOG_DEBUG(("Command Reply packet"));
1337 silc_server_command_reply(server, sock, packet);
1341 * Private Message packets
1343 case SILC_PACKET_PRIVATE_MESSAGE:
1345 * Received private message packet. The packet is coming from either
1348 SILC_LOG_DEBUG(("Private Message packet"));
1349 silc_server_private_message(server, sock, packet);
1352 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
1354 * Private message key packet.
1359 * Key Exchange protocol packets
1361 case SILC_PACKET_KEY_EXCHANGE:
1362 SILC_LOG_DEBUG(("KE packet"));
1363 if (sock->protocol && sock->protocol->protocol->type
1364 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1366 SilcServerKEInternalContext *proto_ctx =
1367 (SilcServerKEInternalContext *)sock->protocol->context;
1369 proto_ctx->packet = silc_packet_context_dup(packet);
1371 /* Let the protocol handle the packet */
1372 sock->protocol->execute(server->timeout_queue, 0,
1373 sock->protocol, sock->sock, 0, 100000);
1375 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
1376 "protocol active, packet dropped."));
1378 /* XXX Trigger KE protocol?? Rekey actually, maybe. */
1382 case SILC_PACKET_KEY_EXCHANGE_1:
1383 SILC_LOG_DEBUG(("KE 1 packet"));
1384 if (sock->protocol && sock->protocol->protocol->type
1385 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1387 SilcServerKEInternalContext *proto_ctx =
1388 (SilcServerKEInternalContext *)sock->protocol->context;
1390 if (proto_ctx->packet)
1391 silc_packet_context_free(proto_ctx->packet);
1393 proto_ctx->packet = silc_packet_context_dup(packet);
1394 proto_ctx->dest_id_type = packet->src_id_type;
1395 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_type);
1397 /* Let the protocol handle the packet */
1398 sock->protocol->execute(server->timeout_queue, 0,
1399 sock->protocol, sock->sock,
1402 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
1403 "protocol active, packet dropped."));
1407 case SILC_PACKET_KEY_EXCHANGE_2:
1408 SILC_LOG_DEBUG(("KE 2 packet"));
1409 if (sock->protocol && sock->protocol->protocol->type
1410 == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
1412 SilcServerKEInternalContext *proto_ctx =
1413 (SilcServerKEInternalContext *)sock->protocol->context;
1415 if (proto_ctx->packet)
1416 silc_packet_context_free(proto_ctx->packet);
1418 proto_ctx->packet = silc_packet_context_dup(packet);
1419 proto_ctx->dest_id_type = packet->src_id_type;
1420 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_type);
1422 /* Let the protocol handle the packet */
1423 sock->protocol->execute(server->timeout_queue, 0,
1424 sock->protocol, sock->sock,
1427 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
1428 "protocol active, packet dropped."));
1432 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
1434 * Connection authentication request packet. When we receive this packet
1435 * we will send to the other end information about our mandatory
1436 * authentication method for the connection. This packet maybe received
1439 SILC_LOG_DEBUG(("Connection authentication request packet"));
1443 * Connection Authentication protocol packets
1445 case SILC_PACKET_CONNECTION_AUTH:
1446 /* Start of the authentication protocol. We receive here the
1447 authentication data and will verify it. */
1448 SILC_LOG_DEBUG(("Connection auth packet"));
1449 if (sock->protocol && sock->protocol->protocol->type
1450 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
1452 SilcServerConnAuthInternalContext *proto_ctx =
1453 (SilcServerConnAuthInternalContext *)sock->protocol->context;
1455 proto_ctx->packet = silc_packet_context_dup(packet);
1457 /* Let the protocol handle the packet */
1458 sock->protocol->execute(server->timeout_queue, 0,
1459 sock->protocol, sock->sock, 0, 0);
1461 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
1462 "protocol active, packet dropped."));
1466 case SILC_PACKET_NEW_ID:
1468 * Received New ID packet. This includes some new ID that has been
1469 * created. It may be for client, server or channel. This is the way
1470 * to distribute information about new registered entities in the
1473 SILC_LOG_DEBUG(("New ID packet"));
1474 silc_server_new_id(server, sock, packet);
1477 case SILC_PACKET_NEW_CLIENT:
1479 * Received new client packet. This includes client information that
1480 * we will use to create initial client ID. After creating new
1481 * ID we will send it to the client.
1483 SILC_LOG_DEBUG(("New Client packet"));
1484 silc_server_new_client(server, sock, packet);
1487 case SILC_PACKET_NEW_SERVER:
1489 * Received new server packet. This includes Server ID and some other
1490 * information that we may save. This is received after server has
1493 SILC_LOG_DEBUG(("New Server packet"));
1494 silc_server_new_server(server, sock, packet);
1497 case SILC_PACKET_NEW_CHANNEL:
1499 * Received new channel packet. Information about new channel in the
1500 * network are distributed using this packet.
1502 SILC_LOG_DEBUG(("New Channel packet"));
1503 silc_server_new_channel(server, sock, packet);
1506 case SILC_PACKET_NEW_CHANNEL_USER:
1508 * Received new channel user packet. Information about new users on a
1509 * channel are distributed between routers using this packet. The
1510 * router receiving this will redistribute it and also sent JOIN notify
1511 * to local clients on the same channel. Normal server sends JOIN notify
1512 * to its local clients on the channel.
1514 SILC_LOG_DEBUG(("New Channel User packet"));
1515 silc_server_new_channel_user(server, sock, packet);
1518 case SILC_PACKET_NEW_CHANNEL_LIST:
1520 * List of new channel packets received. This is usually received when
1521 * existing server or router connects to us and distributes information
1522 * of all channels it has.
1526 case SILC_PACKET_NEW_CHANNEL_USER_LIST:
1528 * List of new channel user packets received. This is usually received
1529 * when existing server or router connects to us and distributes
1530 * information of all channel users it has.
1534 case SILC_PACKET_REPLACE_ID:
1536 * Received replace ID packet. This sends the old ID that is to be
1537 * replaced with the new one included into the packet. Client must not
1540 SILC_LOG_DEBUG(("Replace ID packet"));
1541 silc_server_replace_id(server, sock, packet);
1544 case SILC_PACKET_REMOVE_ID:
1546 * Received remove ID Packet.
1548 SILC_LOG_DEBUG(("Remove ID packet"));
1549 silc_server_remove_id(server, sock, packet);
1552 case SILC_PACKET_REMOVE_CHANNEL_USER:
1554 * Received packet to remove user from a channel. Routers notify other
1555 * routers about a user leaving a channel.
1557 SILC_LOG_DEBUG(("Remove Channel User packet"));
1558 silc_server_remove_channel_user(server, sock, packet);
1562 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
1568 /* Closes connection to socket connection */
1570 void silc_server_close_connection(SilcServer server,
1571 SilcSocketConnection sock)
1574 SILC_LOG_DEBUG(("Closing connection %d", sock->sock));
1576 /* We won't listen for this connection anymore */
1577 silc_schedule_unset_listen_fd(sock->sock);
1579 /* Unregister all tasks */
1580 silc_task_unregister_by_fd(server->io_queue, sock->sock);
1581 silc_task_unregister_by_fd(server->timeout_queue, sock->sock);
1583 /* Close the actual connection */
1584 silc_net_close_connection(sock->sock);
1585 server->sockets[sock->sock] = NULL;
1586 silc_socket_free(sock);
1589 /* Sends disconnect message to remote connection and disconnects the
1592 void silc_server_disconnect_remote(SilcServer server,
1593 SilcSocketConnection sock,
1594 const char *fmt, ...)
1597 unsigned char buf[4096];
1599 memset(buf, 0, sizeof(buf));
1601 vsprintf(buf, fmt, ap);
1604 SILC_LOG_DEBUG(("Disconnecting remote host"));
1606 /* Notify remote end that the conversation is over. The notify message
1607 is tried to be sent immediately. */
1608 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
1609 buf, strlen(buf), TRUE);
1611 /* Mark the connection to be disconnected */
1612 SILC_SET_DISCONNECTED(sock);
1613 silc_server_close_connection(server, sock);
1616 /* Free's user_data pointer from socket connection object. This also sends
1617 appropriate notify packets to the network to inform about leaving
1620 void silc_server_free_sock_user_data(SilcServer server,
1621 SilcSocketConnection sock)
1623 SILC_LOG_DEBUG(("Start"));
1625 switch(sock->type) {
1626 case SILC_SOCKET_TYPE_CLIENT:
1628 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
1630 /* Remove client from all channels */
1631 silc_server_remove_from_channels(server, sock, user_data);
1633 /* XXX must take some info to history before freeing */
1635 /* Send REMOVE_ID packet to routers. */
1636 if (!server->standalone && server->router)
1637 silc_server_send_remove_id(server, server->router->connection,
1638 server->server_type == SILC_SERVER ?
1639 FALSE : TRUE, user_data->id,
1640 SILC_ID_CLIENT_LEN, SILC_ID_CLIENT);
1642 /* Free the client entry and everything in it */
1643 silc_idlist_del_data(user_data);
1644 silc_idlist_del_client(server->local_list, user_data);
1647 case SILC_SOCKET_TYPE_SERVER:
1648 case SILC_SOCKET_TYPE_ROUTER:
1650 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
1652 /* Send REMOVE_ID packet to routers. */
1653 if (!server->standalone && server->router)
1654 silc_server_send_remove_id(server, server->router->connection,
1655 server->server_type == SILC_SERVER ?
1656 FALSE : TRUE, user_data->id,
1657 SILC_ID_CLIENT_LEN, SILC_ID_CLIENT);
1659 /* Free the server entry */
1660 silc_idlist_del_data(user_data);
1661 silc_idlist_del_server(server->local_list, user_data);
1666 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
1668 silc_idlist_del_data(user_data);
1669 silc_free(user_data);
1674 sock->user_data = NULL;
1677 /* Checks whether given channel has global users. If it does this returns
1678 TRUE and FALSE if there is only locally connected clients on the channel. */
1680 int silc_server_channel_has_global(SilcChannelEntry channel)
1682 SilcChannelClientEntry chl;
1684 silc_list_start(channel->user_list);
1685 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
1686 if (chl->client->router)
1693 /* Checks whether given channel has locally connected users. If it does this
1694 returns TRUE and FALSE if there is not one locally connected client. */
1696 int silc_server_channel_has_local(SilcChannelEntry channel)
1698 SilcChannelClientEntry chl;
1700 silc_list_start(channel->user_list);
1701 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
1702 if (!chl->client->router)
1709 /* Removes client from all channels it has joined. This is used when client
1710 connection is disconnected. If the client on a channel is last, the
1711 channel is removed as well. This sends the SIGNOFF notify types. */
1713 void silc_server_remove_from_channels(SilcServer server,
1714 SilcSocketConnection sock,
1715 SilcClientEntry client)
1717 SilcChannelEntry channel;
1718 SilcChannelClientEntry chl;
1719 SilcBuffer chidp, clidp;
1721 SILC_LOG_DEBUG(("Start"));
1723 if (!client || !client->id)
1726 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1728 /* Remove the client from all channels. The client is removed from
1729 the channels' user list. */
1730 silc_list_start(client->channels);
1731 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
1732 channel = chl->channel;
1733 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
1735 /* Remove from list */
1736 silc_list_del(client->channels, chl);
1738 /* If this client is last one on the channel the channel
1739 is removed all together. */
1740 if (silc_list_count(channel->user_list) < 2) {
1742 /* However, if the channel has marked global users then the
1743 channel is not created locally, and this does not remove the
1744 channel globally from SILC network, in this case we will
1745 notify that this client has left the channel. */
1746 if (channel->global_users)
1747 silc_server_send_notify_to_channel(server, channel, FALSE,
1748 SILC_NOTIFY_TYPE_SIGNOFF, 1,
1749 clidp->data, clidp->len);
1751 silc_idlist_del_channel(server->local_list, channel);
1755 /* Remove from list */
1756 silc_list_del(channel->user_list, chl);
1759 /* Send notify to channel about client leaving SILC and thus
1760 the entire channel. */
1761 silc_server_send_notify_to_channel(server, channel, FALSE,
1762 SILC_NOTIFY_TYPE_SIGNOFF, 1,
1763 clidp->data, clidp->len);
1764 silc_buffer_free(chidp);
1767 silc_buffer_free(clidp);
1770 /* Removes client from one channel. This is used for example when client
1771 calls LEAVE command to remove itself from the channel. Returns TRUE
1772 if channel still exists and FALSE if the channel is removed when
1773 last client leaves the channel. If `notify' is FALSE notify messages
1776 int silc_server_remove_from_one_channel(SilcServer server,
1777 SilcSocketConnection sock,
1778 SilcChannelEntry channel,
1779 SilcClientEntry client,
1782 SilcChannelEntry ch;
1783 SilcChannelClientEntry chl;
1786 SILC_LOG_DEBUG(("Start"));
1788 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1790 /* Remove the client from the channel. The client is removed from
1791 the channel's user list. */
1792 silc_list_start(client->channels);
1793 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
1794 if (chl->channel != channel)
1799 /* Remove from list */
1800 silc_list_del(client->channels, chl);
1802 /* If this client is last one on the channel the channel
1803 is removed all together. */
1804 if (silc_list_count(channel->user_list) < 2) {
1805 /* Notify about leaving client if this channel has global users. */
1806 if (notify && channel->global_users)
1807 silc_server_send_notify_to_channel(server, channel, FALSE,
1808 SILC_NOTIFY_TYPE_LEAVE, 1,
1809 clidp->data, clidp->len);
1811 silc_idlist_del_channel(server->local_list, channel);
1812 silc_buffer_free(clidp);
1816 /* Remove from list */
1817 silc_list_del(channel->user_list, chl);
1820 /* If there is no global users on the channel anymore mark the channel
1821 as local channel. */
1822 if (server->server_type == SILC_SERVER &&
1823 !silc_server_channel_has_global(channel))
1824 channel->global_users = FALSE;
1826 /* If tehre is not at least one local user on the channel then we don't
1827 need the channel entry anymore, we can remove it safely. */
1828 if (server->server_type == SILC_SERVER &&
1829 !silc_server_channel_has_local(channel)) {
1830 silc_idlist_del_channel(server->local_list, channel);
1831 silc_buffer_free(clidp);
1835 /* Send notify to channel about client leaving the channel */
1837 silc_server_send_notify_to_channel(server, channel, FALSE,
1838 SILC_NOTIFY_TYPE_LEAVE, 1,
1839 clidp->data, clidp->len);
1843 silc_buffer_free(clidp);
1847 /* Returns TRUE if the given client is on the channel. FALSE if not.
1848 This works because we assure that the user list on the channel is
1849 always in up to date thus we can only check the channel list from
1850 `client' which is faster than checking the user list from `channel'. */
1852 int silc_server_client_on_channel(SilcClientEntry client,
1853 SilcChannelEntry channel)
1855 SilcChannelClientEntry chl;
1857 if (!client || !channel)
1860 silc_list_start(client->channels);
1861 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END)
1862 if (chl->channel == channel)
1868 /* Timeout callback. This is called if connection is idle or for some
1869 other reason is not responding within some period of time. This
1870 disconnects the remote end. */
1872 SILC_TASK_CALLBACK(silc_server_timeout_remote)
1874 SilcServerConnection sconn = (SilcServerConnection)context;
1875 SilcSocketConnection sock = sconn->server->sockets[fd];
1877 silc_server_disconnect_remote(sconn->server, sock,
1878 "Server closed connection: "
1879 "Connection timeout");
1882 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
1883 function may be used only by router. In real SILC network all channels
1884 are created by routers thus this function is never used by normal
1887 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
1888 SilcServerID *router_id,
1892 SilcChannelID *channel_id;
1893 SilcChannelEntry entry;
1896 SILC_LOG_DEBUG(("Creating new channel"));
1901 /* Allocate cipher */
1902 silc_cipher_alloc(cipher, &key);
1904 channel_name = strdup(channel_name);
1906 /* Create the channel */
1907 silc_id_create_channel_id(router_id, server->rng, &channel_id);
1908 entry = silc_idlist_add_channel(server->local_list, channel_name,
1909 SILC_CHANNEL_MODE_NONE, channel_id,
1912 silc_free(channel_name);
1916 /* Now create the actual key material */
1917 silc_server_create_channel_key(server, entry, 16);
1919 /* Notify other routers about the new channel. We send the packet
1920 to our primary route. */
1921 if (server->standalone == FALSE) {
1922 silc_server_send_new_channel(server, server->router->connection, TRUE,
1923 channel_name, entry->id, SILC_ID_CHANNEL_LEN);
1929 /* Generates new channel key. This is used to create the initial channel key
1930 but also to re-generate new key for channel. If `key_len' is provided
1931 it is the bytes of the key length. */
1933 void silc_server_create_channel_key(SilcServer server,
1934 SilcChannelEntry channel,
1935 unsigned int key_len)
1938 unsigned char channel_key[32];
1941 if (!channel->channel_key)
1942 silc_cipher_alloc("twofish", &channel->channel_key);
1946 else if (channel->key_len)
1947 len = channel->key_len / 8;
1949 len = sizeof(channel_key);
1951 /* Create channel key */
1952 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
1955 channel->channel_key->cipher->set_key(channel->channel_key->context,
1958 /* Remove old key if exists */
1960 memset(channel->key, 0, channel->key_len / 8);
1961 silc_free(channel->key);
1965 channel->key_len = len * 8;
1966 channel->key = silc_calloc(len, sizeof(*channel->key));
1967 memcpy(channel->key, channel_key, len);
1968 memset(channel_key, 0, sizeof(channel_key));
1971 /* Saves the channel key found in the encoded `key_payload' buffer. This
1972 function is used when we receive Channel Key Payload and also when we're
1973 processing JOIN command reply. Returns entry to the channel. */
1975 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
1976 SilcBuffer key_payload,
1977 SilcChannelEntry channel)
1979 SilcChannelKeyPayload payload = NULL;
1980 SilcChannelID *id = NULL;
1982 unsigned int tmp_len;
1985 /* Decode channel key payload */
1986 payload = silc_channel_key_payload_parse(key_payload);
1988 SILC_LOG_ERROR(("Bad channel key payload, dropped"));
1993 /* Get the channel entry */
1996 /* Get channel ID */
1997 tmp = silc_channel_key_get_id(payload, &tmp_len);
1998 id = silc_id_str2id(tmp, SILC_ID_CHANNEL);
2004 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
2006 SILC_LOG_ERROR(("Received key for non-existent channel"));
2011 tmp = silc_channel_key_get_key(payload, &tmp_len);
2017 cipher = silc_channel_key_get_cipher(payload, NULL);;
2023 /* Remove old key if exists */
2025 memset(channel->key, 0, channel->key_len / 8);
2026 silc_free(channel->key);
2027 silc_cipher_free(channel->channel_key);
2030 /* Create new cipher */
2031 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
2037 channel->key_len = tmp_len * 8;
2038 channel->key = silc_calloc(tmp_len, sizeof(unsigned char));
2039 memcpy(channel->key, tmp, tmp_len);
2040 channel->channel_key->cipher->set_key(channel->channel_key->context,
2047 silc_channel_key_payload_free(payload);