apps/silcd/server.c

   1 /*
   2
   3   server.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 1997 - 2002 Pekka Riikonen
   8
   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; version 2 of the License.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18 */
  19 /*
  20  * This is the actual SILC server than handles everything relating to
  21  * servicing the SILC connections. This is also a SILC router as a router
  22  * is also normal server.
  23  */
  24 /* $Id$ */
  25
  26 #include "serverincludes.h"
  27 #include "server_internal.h"
  28
  29 /* Static prototypes */
  30 SILC_TASK_CALLBACK(silc_server_rehash_close_connection);
  31 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry);
  32 SILC_TASK_CALLBACK(silc_server_connect_router);
  33 SILC_TASK_CALLBACK(silc_server_connect_to_router);
  34 SILC_TASK_CALLBACK(silc_server_connect_to_router_second);
  35 SILC_TASK_CALLBACK(silc_server_connect_to_router_final);
  36 SILC_TASK_CALLBACK(silc_server_accept_new_connection);
  37 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second);
  38 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final);
  39 SILC_TASK_CALLBACK(silc_server_packet_process);
  40 SILC_TASK_CALLBACK(silc_server_packet_parse_real);
  41 SILC_TASK_CALLBACK(silc_server_close_connection_final);
  42 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout);
  43 SILC_TASK_CALLBACK(silc_server_timeout_remote);
  44 SILC_TASK_CALLBACK(silc_server_channel_key_rekey);
  45 SILC_TASK_CALLBACK(silc_server_failure_callback);
  46 SILC_TASK_CALLBACK(silc_server_rekey_callback);
  47 SILC_TASK_CALLBACK(silc_server_get_stats);
  48
  49 /* Allocates a new SILC server object. This has to be done before the server
  50    can be used. After allocation one must call silc_server_init to initialize
  51    the server. The new allocated server object is returned to the new_server
  52    argument. */
  53
  54 int silc_server_alloc(SilcServer *new_server)
  55 {
  56   SilcServer server;
  57
  58   SILC_LOG_DEBUG(("Allocating new server object"));
  59
  60   server = silc_calloc(1, sizeof(*server));
  61   server->server_type = SILC_SERVER;
  62   server->standalone = TRUE;
  63   server->local_list = silc_calloc(1, sizeof(*server->local_list));
  64   server->global_list = silc_calloc(1, sizeof(*server->global_list));
  65   server->pending_commands = silc_dlist_init();
  66 #ifdef SILC_SIM
  67   server->sim = silc_dlist_init();
  68 #endif
  69
  70   *new_server = server;
  71
  72   return TRUE;
  73 }
  74
  75 /* Free's the SILC server object. This is called at the very end before
  76    the program ends. */
  77
  78 void silc_server_free(SilcServer server)
  79 {
  80   SilcIDCacheList list;
  81   SilcIDCacheEntry cache;
  82
  83   if (!server)
  84     return;
  85
  86 #ifdef SILC_SIM
  87   {
  88     SilcSim sim;
  89
  90     while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
  91       silc_dlist_del(server->sim, sim);
  92       silc_sim_free(sim);
  93     }
  94     silc_dlist_uninit(server->sim);
  95   }
  96 #endif
  97
  98   silc_server_backup_free(server);
  99   silc_server_config_unref(&server->config_ref);
 100   if (server->rng)
 101     silc_rng_free(server->rng);
 102   if (server->pkcs)
 103     silc_pkcs_free(server->pkcs);
 104   if (server->public_key)
 105     silc_pkcs_public_key_free(server->public_key);
 106   if (server->private_key)
 107     silc_pkcs_private_key_free(server->private_key);
 108   if (server->pending_commands)
 109     silc_dlist_uninit(server->pending_commands);
 110   if (server->id_entry)
 111     silc_idlist_del_server(server->local_list, server->id_entry);
 112
 113   /* Delete all channels */
 114   list = NULL;
 115   if (silc_idcache_get_all(server->local_list->channels, &list) &&
 116       silc_idcache_list_first(list, &cache)) {
 117     silc_idlist_del_channel(server->local_list, cache->context);
 118     while (silc_idcache_list_next(list, &cache))
 119       silc_idlist_del_channel(server->local_list, cache->context);
 120   }
 121   if (list)
 122     silc_idcache_list_free(list);
 123   list = NULL;
 124   if (silc_idcache_get_all(server->global_list->channels, &list) &&
 125       silc_idcache_list_first(list, &cache)) {
 126     silc_idlist_del_channel(server->global_list, cache->context);
 127     while (silc_idcache_list_next(list, &cache))
 128       silc_idlist_del_channel(server->global_list, cache->context);
 129   }
 130   if (list)
 131     silc_idcache_list_free(list);
 132
 133   /* Delete all clients */
 134   list = NULL;
 135   if (silc_idcache_get_all(server->local_list->clients, &list) &&
 136       silc_idcache_list_first(list, &cache)) {
 137     silc_idlist_del_client(server->local_list, cache->context);
 138     while (silc_idcache_list_next(list, &cache))
 139       silc_idlist_del_client(server->local_list, cache->context);
 140   }
 141   if (list)
 142     silc_idcache_list_free(list);
 143   list = NULL;
 144   if (silc_idcache_get_all(server->global_list->clients, &list) &&
 145       silc_idcache_list_first(list, &cache)) {
 146     silc_idlist_del_client(server->global_list, cache->context);
 147     while (silc_idcache_list_next(list, &cache))
 148       silc_idlist_del_client(server->global_list, cache->context);
 149   }
 150   if (list)
 151     silc_idcache_list_free(list);
 152
 153   /* Delete all servers */
 154   list = NULL;
 155   if (silc_idcache_get_all(server->local_list->servers, &list) &&
 156       silc_idcache_list_first(list, &cache)) {
 157     silc_idlist_del_server(server->local_list, cache->context);
 158     while (silc_idcache_list_next(list, &cache))
 159       silc_idlist_del_server(server->local_list, cache->context);
 160   }
 161   if (list)
 162     silc_idcache_list_free(list);
 163   list = NULL;
 164   if (silc_idcache_get_all(server->global_list->servers, &list) &&
 165       silc_idcache_list_first(list, &cache)) {
 166     silc_idlist_del_server(server->global_list, cache->context);
 167     while (silc_idcache_list_next(list, &cache))
 168       silc_idlist_del_server(server->global_list, cache->context);
 169   }
 170   if (list)
 171     silc_idcache_list_free(list);
 172
 173   silc_idcache_free(server->local_list->clients);
 174   silc_idcache_free(server->local_list->servers);
 175   silc_idcache_free(server->local_list->channels);
 176   silc_idcache_free(server->global_list->clients);
 177   silc_idcache_free(server->global_list->servers);
 178   silc_idcache_free(server->global_list->channels);
 179   silc_hash_table_free(server->watcher_list);
 180
 181   silc_hash_free(server->md5hash);
 182   silc_hash_free(server->sha1hash);
 183   silc_hmac_unregister_all();
 184   silc_hash_unregister_all();
 185   silc_cipher_unregister_all();
 186   silc_pkcs_unregister_all();
 187
 188   silc_free(server->local_list);
 189   silc_free(server->global_list);
 190   silc_free(server->server_name);
 191   silc_free(server->id_string);
 192   silc_free(server->purge_i);
 193   silc_free(server->purge_g);
 194   silc_free(server);
 195 }
 196
 197 /* Creates a new server listener. */
 198
 199 static bool silc_server_listen(SilcServer server, const char *server_ip,
 200                                SilcUInt16 port, int *sock)
 201 {
 202   *sock = silc_net_create_server(port, server_ip);
 203   if (*sock < 0) {
 204     SILC_SERVER_LOG_ERROR(("Could not create server listener: %s on %hu",
 205                         server_ip, port));
 206     return FALSE;
 207   }
 208   return TRUE;
 209 }
 210
 211 /* Adds a secondary listener. */
 212
 213 bool silc_server_init_secondary(SilcServer server)
 214 {
 215   int sock = 0, sock_list[server->config->param.connections_max];
 216   SilcSocketConnection newsocket = NULL;
 217   SilcServerConfigServerInfoInterface *interface;
 218
 219   for (interface = server->config->server_info->secondary; interface;
 220         interface = interface->next, sock++) {
 221
 222     if (!silc_server_listen(server,
 223         interface->server_ip, interface->port, &sock_list[sock]))
 224       goto err;
 225
 226     /* Set socket to non-blocking mode */
 227     silc_net_set_socket_nonblock(sock_list[sock]);
 228
 229     /* Add ourselves also to the socket table. The entry allocated above
 230        is sent as argument for fast referencing in the future. */
 231     silc_socket_alloc(sock_list[sock],
 232                       SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
 233     server->sockets[sock_list[sock]] = newsocket;
 234     SILC_SET_LISTENER(newsocket);
 235
 236     /* Perform name and address lookups to resolve the listenning address
 237        and port. */
 238     if (!silc_net_check_local_by_sock(sock_list[sock], &newsocket->hostname,
 239                             &newsocket->ip)) {
 240       if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
 241         !newsocket->ip) {
 242         SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
 243                       newsocket->hostname ? newsocket->hostname :
 244                       newsocket->ip ? newsocket->ip : ""));
 245         server->stat.conn_failures++;
 246         goto err;
 247       }
 248       if (!newsocket->hostname)
 249         newsocket->hostname = strdup(newsocket->ip);
 250     }
 251     newsocket->port = silc_net_get_local_port(sock);
 252
 253     newsocket->user_data = (void *)server->id_entry;
 254     silc_schedule_task_add(server->schedule, sock_list[sock],
 255                            silc_server_accept_new_connection,
 256                            (void *)server, 0, 0,
 257                            SILC_TASK_FD,
 258                            SILC_TASK_PRI_NORMAL);
 259   }
 260
 261   return TRUE;
 262
 263  err:
 264   do silc_net_close_server(sock_list[sock--]); while (sock >= 0);
 265   return FALSE;
 266 }
 267
 268 /* Initializes the entire SILC server. This is called always before running
 269    the server. This is called only once at the initialization of the program.
 270    This binds the server to its listenning port. After this function returns
 271    one should call silc_server_run to start the server. This returns TRUE
 272    when everything is ok to run the server. Configuration file must be
 273    read and parsed before calling this. */
 274
 275 bool silc_server_init(SilcServer server)
 276 {
 277   int sock;
 278   SilcServerID *id;
 279   SilcServerEntry id_entry;
 280   SilcIDListPurge purge;
 281   SilcSocketConnection newsocket = NULL;
 282
 283   SILC_LOG_DEBUG(("Initializing server"));
 284
 285   server->starttime = time(NULL);
 286
 287   /* Take config object for us */
 288   silc_server_config_ref(&server->config_ref, server->config,
 289                          server->config);
 290
 291   /* Steal public and private key from the config object */
 292   server->public_key = server->config->server_info->public_key;
 293   server->private_key = server->config->server_info->private_key;
 294   server->config->server_info->public_key = NULL;
 295   server->config->server_info->private_key = NULL;
 296
 297   /* Register all configured ciphers, PKCS and hash functions. */
 298   if (!silc_server_config_register_ciphers(server))
 299     silc_cipher_register_default();
 300   if (!silc_server_config_register_pkcs(server))
 301     silc_pkcs_register_default();
 302   if (!silc_server_config_register_hashfuncs(server))
 303     silc_hash_register_default();
 304   if (!silc_server_config_register_hmacs(server))
 305     silc_hmac_register_default();
 306
 307   /* Initialize random number generator for the server. */
 308   server->rng = silc_rng_alloc();
 309   silc_rng_init(server->rng);
 310   silc_rng_global_init(server->rng);
 311
 312   /* Initialize hash functions for server to use */
 313   silc_hash_alloc("md5", &server->md5hash);
 314   silc_hash_alloc("sha1", &server->sha1hash);
 315
 316   /* Allocate PKCS context for local public and private keys */
 317   if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
 318     goto err;
 319   silc_pkcs_public_key_set(server->pkcs, server->public_key);
 320   silc_pkcs_private_key_set(server->pkcs, server->private_key);
 321
 322   /* Initialize the scheduler */
 323   server->schedule = silc_schedule_init(server->config->param.connections_max,
 324                                         server);
 325   if (!server->schedule)
 326     goto err;
 327
 328   /* First, register log files configuration for error output */
 329   silc_server_config_setlogfiles(server);
 330
 331   /* Initialize ID caches */
 332   server->local_list->clients =
 333     silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
 334   server->local_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
 335   server->local_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
 336
 337   /* These are allocated for normal server as well as these hold some
 338      global information that the server has fetched from its router. For
 339      router these are used as they are supposed to be used on router. */
 340   server->global_list->clients =
 341     silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
 342   server->global_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
 343   server->global_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
 344
 345   /* Init watcher list */
 346   server->watcher_list =
 347     silc_hash_table_alloc(1, silc_hash_client_id_hash, NULL,
 348                           silc_hash_data_compare, (void *)CLIENTID_HASH_LEN,
 349                           NULL, NULL, TRUE);
 350   if (!server->watcher_list)
 351     goto err;
 352
 353   /* Create a listening server */
 354   if (!silc_server_listen(server,
 355                 server->config->server_info->primary == NULL ? NULL :
 356                         server->config->server_info->primary->server_ip,
 357                 server->config->server_info->primary == NULL ? 0 :
 358                         server->config->server_info->primary->port,
 359                 &sock))
 360     goto err;
 361
 362   /* Set socket to non-blocking mode */
 363   silc_net_set_socket_nonblock(sock);
 364   server->sock = sock;
 365
 366   /* Allocate the entire socket list that is used in server. Eventually
 367      all connections will have entry in this table (it is a table of
 368      pointers to the actual object that is allocated individually
 369      later). */
 370   server->sockets = silc_calloc(server->config->param.connections_max,
 371                                 sizeof(*server->sockets));
 372   if (!server->sockets)
 373     goto err;
 374
 375   /* Add ourselves also to the socket table. The entry allocated above
 376      is sent as argument for fast referencing in the future. */
 377   silc_socket_alloc(sock, SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
 378   server->sockets[sock] = newsocket;
 379   SILC_SET_LISTENER(newsocket);
 380
 381   /* Perform name and address lookups to resolve the listenning address
 382      and port. */
 383   if (!silc_net_check_local_by_sock(sock, &newsocket->hostname,
 384                                     &newsocket->ip)) {
 385     if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
 386         !newsocket->ip) {
 387       SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
 388                       newsocket->hostname ? newsocket->hostname :
 389                       newsocket->ip ? newsocket->ip : ""));
 390       server->stat.conn_failures++;
 391       goto err;
 392     }
 393     if (!newsocket->hostname)
 394       newsocket->hostname = strdup(newsocket->ip);
 395   }
 396   newsocket->port = silc_net_get_local_port(sock);
 397
 398   /* Create a Server ID for the server. */
 399   silc_id_create_server_id(newsocket->ip, newsocket->port, server->rng, &id);
 400   if (!id)
 401     goto err;
 402
 403   server->id = id;
 404   server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
 405   server->id_string_len = silc_id_get_len(id, SILC_ID_SERVER);
 406   server->server_name = server->config->server_info->server_name;
 407   server->config->server_info->server_name = NULL;
 408
 409   /* Add ourselves to the server list. We don't have a router yet
 410      beacuse we haven't established a route yet. It will be done later.
 411      For now, NULL is sent as router. This allocates new entry to
 412      the ID list. */
 413   id_entry =
 414     silc_idlist_add_server(server->local_list, strdup(server->server_name),
 415                            server->server_type, server->id, NULL, NULL);
 416   if (!id_entry) {
 417     SILC_LOG_ERROR(("Could not add ourselves to cache"));
 418     goto err;
 419   }
 420   id_entry->data.status |= SILC_IDLIST_STATUS_REGISTERED;
 421
 422   /* Put the allocated socket pointer also to the entry allocated above
 423      for fast back-referencing to the socket list. */
 424   newsocket->user_data = (void *)id_entry;
 425   id_entry->connection = (void *)newsocket;
 426   server->id_entry = id_entry;
 427
 428   /* Register protocols */
 429   silc_server_protocols_register();
 430
 431   /* Add the first task to the scheduler. This is task that is executed by
 432      timeout. It expires as soon as the caller calls silc_server_run. This
 433      task performs authentication protocol and key exchange with our
 434      primary router. */
 435   silc_schedule_task_add(server->schedule, 0,
 436                          silc_server_connect_to_router,
 437                          (void *)server, 0, 1,
 438                          SILC_TASK_TIMEOUT,
 439                          SILC_TASK_PRI_NORMAL);
 440
 441   /* Add listener task to the scheduler. This task receives new connections
 442      to the server. This task remains on the queue until the end of the
 443      program. */
 444   silc_schedule_task_add(server->schedule, sock,
 445                          silc_server_accept_new_connection,
 446                          (void *)server, 0, 0,
 447                          SILC_TASK_FD,
 448                          SILC_TASK_PRI_NORMAL);
 449
 450   if (silc_server_init_secondary(server) == FALSE)
 451     goto err;
 452
 453   server->listenning = TRUE;
 454
 455   /* If server connections has been configured then we must be router as
 456      normal server cannot have server connections, only router connections. */
 457   if (server->config->servers) {
 458     SilcServerConfigServer *ptr = server->config->servers;
 459
 460     server->server_type = SILC_ROUTER;
 461     while (ptr) {
 462       if (ptr->backup_router) {
 463         server->server_type = SILC_BACKUP_ROUTER;
 464         server->backup_router = TRUE;
 465         server->id_entry->server_type = SILC_BACKUP_ROUTER;
 466         break;
 467       }
 468       ptr = ptr->next;
 469     }
 470   }
 471
 472   /* Register the ID Cache purge task. This periodically purges the ID cache
 473      and removes the expired cache entries. */
 474
 475   /* Clients local list */
 476   server->purge_i = purge = silc_calloc(1, sizeof(*purge));
 477   purge->cache = server->local_list->clients;
 478   purge->timeout = 600;
 479   silc_schedule_task_add(server->schedule, 0, silc_idlist_purge,
 480                          (void *)purge, purge->timeout, 0,
 481                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
 482
 483   /* Clients global list */
 484   server->purge_g = purge = silc_calloc(1, sizeof(*purge));
 485   purge->cache = server->global_list->clients;
 486   purge->timeout = 300;
 487   silc_schedule_task_add(server->schedule, 0, silc_idlist_purge,
 488                          (void *)purge, purge->timeout, 0,
 489                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
 490
 491   /* If we are normal server we'll retrieve network statisticial information
 492      once in a while from the router. */
 493   if (server->server_type != SILC_ROUTER)
 494     silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
 495                            server, 10, 0, SILC_TASK_TIMEOUT,
 496                            SILC_TASK_PRI_LOW);
 497
 498   if (server->server_type == SILC_ROUTER)
 499     server->stat.routers++;
 500
 501   SILC_LOG_DEBUG(("Server initialized"));
 502
 503   /* We are done here, return succesfully */
 504   return TRUE;
 505
 506  err:
 507   silc_server_config_unref(&server->config_ref);
 508   silc_net_close_server(sock);
 509   return FALSE;
 510 }
 511
 512 /* Task callback to close a socket connection after rehash */
 513
 514 SILC_TASK_CALLBACK(silc_server_rehash_close_connection)
 515 {
 516   SilcServer server = context;
 517   SilcSocketConnection sock = server->sockets[fd];
 518
 519   if (!sock)
 520     return;
 521
 522   SILC_LOG_INFO(("Connection %s:%d [%s] is unconfigured",
 523                  sock->hostname, sock->port,
 524                  (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
 525                   sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
 526                   sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
 527                   "Router")));
 528   silc_schedule_task_del_by_context(server->schedule, sock);
 529   silc_server_disconnect_remote(server, sock,
 530                                 SILC_STATUS_ERR_BANNED_FROM_SERVER,
 531                                 "This connection is removed from "
 532                                 "configuration");
 533   if (sock->user_data)
 534     silc_server_free_sock_user_data(server, sock, NULL);
 535 }
 536
 537 /* This function basically reads the config file again and switches the config
 538    object pointed by the server object. After that, we have to fix various
 539    things such as the server_name and the listening ports.
 540    Keep in mind that we no longer have the root privileges at this point. */
 541
 542 bool silc_server_rehash(SilcServer server)
 543 {
 544   SilcServerConfig newconfig;
 545
 546   SILC_LOG_INFO(("Rehashing server"));
 547
 548   /* Reset the logging system */
 549   silc_log_quick = TRUE;
 550   silc_log_flush_all();
 551
 552   /* Start the main rehash phase (read again the config file) */
 553   newconfig = silc_server_config_alloc(server->config_file);
 554   if (!newconfig) {
 555     SILC_LOG_ERROR(("Rehash FAILED."));
 556     return FALSE;
 557   }
 558
 559   /* Reinit scheduler if necessary */
 560   if (newconfig->param.connections_max > server->config->param.connections_max)
 561     if (!silc_schedule_reinit(server->schedule,
 562                               newconfig->param.connections_max))
 563       return FALSE;
 564
 565   /* Fix the server_name field */
 566   if (strcmp(server->server_name, newconfig->server_info->server_name)) {
 567     silc_free(server->server_name);
 568     server->server_name = newconfig->server_info->server_name;
 569     newconfig->server_info->server_name = NULL;
 570
 571     /* Update the idcache list with a fresh pointer */
 572     silc_free(server->id_entry->server_name);
 573     server->id_entry->server_name = strdup(server->server_name);
 574     if (!silc_idcache_del_by_context(server->local_list->servers,
 575                                      server->id_entry))
 576       return FALSE;
 577     if (!silc_idcache_add(server->local_list->servers,
 578                           server->id_entry->server_name,
 579                           server->id_entry->id, server->id_entry, 0, NULL))
 580       return FALSE;
 581   }
 582
 583   /* Set logging */
 584   silc_server_config_setlogfiles(server);
 585
 586   /* Change new key pair if necessary */
 587   if (newconfig->server_info->public_key &&
 588       !silc_pkcs_public_key_compare(server->public_key,
 589                                     newconfig->server_info->public_key)) {
 590     silc_pkcs_public_key_free(server->public_key);
 591     silc_pkcs_private_key_free(server->private_key);
 592     server->public_key = newconfig->server_info->public_key;
 593     server->private_key = newconfig->server_info->private_key;
 594     newconfig->server_info->public_key = NULL;
 595     newconfig->server_info->private_key = NULL;
 596
 597     /* Allocate PKCS context for local public and private keys */
 598     silc_pkcs_free(server->pkcs);
 599     if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
 600       return FALSE;
 601     silc_pkcs_public_key_set(server->pkcs, server->public_key);
 602     silc_pkcs_private_key_set(server->pkcs, server->private_key);
 603   }
 604
 605   /* Check for unconfigured server and router connections and close
 606      connections that were unconfigured. */
 607
 608   if (server->config->routers) {
 609     SilcServerConfigRouter *ptr;
 610     SilcServerConfigRouter *newptr;
 611     bool found;
 612
 613     for (ptr = server->config->routers; ptr; ptr = ptr->next) {
 614       found = FALSE;
 615
 616       /* Check whether new config has this one too */
 617       for (newptr = newconfig->routers; newptr; newptr = newptr->next) {
 618         if (silc_string_compare(newptr->host, ptr->host) &&
 619             newptr->port == ptr->port &&
 620             newptr->initiator == ptr->initiator) {
 621           found = TRUE;
 622           break;
 623         }
 624       }
 625
 626       if (!found && ptr->host) {
 627         /* Remove this connection */
 628         SilcSocketConnection sock;
 629         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_ROUTER,
 630                                                ptr->host, ptr->port);
 631         if (sock && !SILC_IS_LISTENER(sock))
 632           silc_schedule_task_add(server->schedule, sock->sock,
 633                                  silc_server_rehash_close_connection,
 634                                  server, 0, 1, SILC_TASK_TIMEOUT,
 635                                  SILC_TASK_PRI_NORMAL);
 636       }
 637     }
 638   }
 639
 640   if (server->config->servers) {
 641     SilcServerConfigServer *ptr;
 642     SilcServerConfigServer *newptr;
 643     bool found;
 644
 645     for (ptr = server->config->servers; ptr; ptr = ptr->next) {
 646       found = FALSE;
 647
 648       /* Check whether new config has this one too */
 649       for (newptr = newconfig->servers; newptr; newptr = newptr->next) {
 650         if (silc_string_compare(newptr->host, ptr->host)) {
 651           found = TRUE;
 652           break;
 653         }
 654       }
 655
 656       if (!found && ptr->host) {
 657         /* Remove this connection */
 658         SilcSocketConnection sock;
 659         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_SERVER,
 660                                                ptr->host, 0);
 661         if (sock && !SILC_IS_LISTENER(sock))
 662           silc_schedule_task_add(server->schedule, sock->sock,
 663                                  silc_server_rehash_close_connection,
 664                                  server, 0, 1, SILC_TASK_TIMEOUT,
 665                                  SILC_TASK_PRI_NORMAL);
 666       }
 667     }
 668   }
 669
 670   if (server->config->clients) {
 671     SilcServerConfigClient *ptr;
 672     SilcServerConfigClient *newptr;
 673     bool found;
 674
 675     for (ptr = server->config->clients; ptr; ptr = ptr->next) {
 676       found = FALSE;
 677
 678       /* Check whether new config has this one too */
 679       for (newptr = newconfig->clients; newptr; newptr = newptr->next) {
 680         if (silc_string_compare(newptr->host, ptr->host)) {
 681           found = TRUE;
 682           break;
 683         }
 684       }
 685
 686       if (!found && ptr->host) {
 687         /* Remove this connection */
 688         SilcSocketConnection sock;
 689         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_CLIENT,
 690                                                ptr->host, 0);
 691         if (sock)
 692           silc_schedule_task_add(server->schedule, sock->sock,
 693                                  silc_server_rehash_close_connection,
 694                                  server, 0, 1, SILC_TASK_TIMEOUT,
 695                                  SILC_TASK_PRI_NORMAL);
 696       }
 697     }
 698   }
 699
 700   /* Go through all configured routers after rehash */
 701   silc_schedule_task_add(server->schedule, 0,
 702                          silc_server_connect_to_router,
 703                          (void *)server, 0, 1,
 704                          SILC_TASK_TIMEOUT,
 705                          SILC_TASK_PRI_NORMAL);
 706
 707   /* Check whether our router status has changed */
 708   if (newconfig->servers) {
 709     SilcServerConfigServer *ptr = newconfig->servers;
 710
 711     server->server_type = SILC_ROUTER;
 712     while (ptr) {
 713       if (ptr->backup_router) {
 714         server->server_type = SILC_BACKUP_ROUTER;
 715         server->backup_router = TRUE;
 716         server->id_entry->server_type = SILC_BACKUP_ROUTER;
 717         break;
 718       }
 719       ptr = ptr->next;
 720     }
 721   }
 722
 723   /* Our old config is gone now. We'll unreference our reference made in
 724      silc_server_init and then destroy it since we are destroying it
 725      underneath the application (layer which called silc_server_init). */
 726   silc_server_config_unref(&server->config_ref);
 727   silc_server_config_destroy(server->config);
 728
 729   /* Take new config context */
 730   server->config = newconfig;
 731   silc_server_config_ref(&server->config_ref, server->config, server->config);
 732
 733   SILC_LOG_DEBUG(("Server rehashed"));
 734
 735   return TRUE;
 736 }
 737
 738 /* The heart of the server. This runs the scheduler thus runs the server.
 739    When this returns the server has been stopped and the program will
 740    be terminated. */
 741
 742 void silc_server_run(SilcServer server)
 743 {
 744   SILC_LOG_INFO(("SILC Server started"));
 745
 746   /* Start the scheduler, the heart of the SILC server. When this returns
 747      the program will be terminated. */
 748   silc_schedule(server->schedule);
 749 }
 750
 751 /* Stops the SILC server. This function is used to shutdown the server.
 752    This is usually called after the scheduler has returned. After stopping
 753    the server one should call silc_server_free. */
 754
 755 void silc_server_stop(SilcServer server)
 756 {
 757   SILC_LOG_INFO(("SILC Server shutting down"));
 758
 759   if (server->schedule) {
 760     int i;
 761
 762     server->server_shutdown = TRUE;
 763
 764     /* Close all connections */
 765     for (i = 0; i < server->config->param.connections_max; i++) {
 766       if (!server->sockets[i])
 767         continue;
 768       if (!SILC_IS_LISTENER(server->sockets[i])) {
 769         SilcSocketConnection sock = server->sockets[i];
 770         SilcIDListData idata = sock->user_data;
 771
 772         if (idata)
 773           idata->status &= ~SILC_IDLIST_STATUS_DISABLED;
 774
 775         silc_schedule_task_del_by_context(server->schedule,
 776                                           server->sockets[i]);
 777         silc_server_disconnect_remote(server, server->sockets[i],
 778                                       SILC_STATUS_OK,
 779                                       "Server is shutting down");
 780         if (sock->user_data)
 781           silc_server_free_sock_user_data(server, sock,
 782                                           "Server is shutting down");
 783         silc_socket_free(sock);
 784       } else {
 785         silc_socket_free(server->sockets[i]);
 786         server->sockets[i] = NULL;
 787       }
 788     }
 789
 790     /* We are not connected to network anymore */
 791     server->standalone = TRUE;
 792
 793     silc_schedule_stop(server->schedule);
 794     silc_schedule_uninit(server->schedule);
 795     server->schedule = NULL;
 796
 797     silc_free(server->sockets);
 798     server->sockets = NULL;
 799   }
 800
 801   silc_server_protocols_unregister();
 802
 803   SILC_LOG_DEBUG(("Server stopped"));
 804 }
 805
 806 /* Function that is called when the network connection to a router has
 807    been established.  This will continue with the key exchange protocol
 808    with the remote router. */
 809
 810 void silc_server_start_key_exchange(SilcServer server,
 811                                     SilcServerConnection sconn,
 812                                     int sock)
 813 {
 814   SilcSocketConnection newsocket;
 815   SilcProtocol protocol;
 816   SilcServerKEInternalContext *proto_ctx;
 817   SilcServerConfigRouter *conn =
 818     (SilcServerConfigRouter *) sconn->conn.ref_ptr;
 819   void *context;
 820
 821   /* Cancel any possible retry timeouts */
 822   silc_schedule_task_del_by_callback(server->schedule,
 823                                      silc_server_connect_to_router_retry);
 824
 825   /* Set socket options */
 826   silc_net_set_socket_nonblock(sock);
 827   silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
 828
 829   /* Create socket connection for the connection. Even though we
 830      know that we are connecting to a router we will mark the socket
 831      to be unknown connection until we have executed authentication
 832      protocol. */
 833   silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
 834   server->sockets[sock] = newsocket;
 835   newsocket->hostname = strdup(sconn->remote_host);
 836   newsocket->ip = strdup(sconn->remote_host);
 837   newsocket->port = sconn->remote_port;
 838   sconn->sock = newsocket;
 839
 840   /* Allocate internal protocol context. This is sent as context
 841      to the protocol. */
 842   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
 843   proto_ctx->server = (void *)server;
 844   proto_ctx->context = (void *)sconn;
 845   proto_ctx->sock = newsocket;
 846   proto_ctx->rng = server->rng;
 847   proto_ctx->responder = FALSE;
 848
 849   /* Set Key Exchange flags from configuration, but fall back to global
 850      settings too. */
 851   SILC_GET_SKE_FLAGS(conn, proto_ctx);
 852   if (server->config->param.key_exchange_pfs)
 853     proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
 854
 855   /* Perform key exchange protocol. silc_server_connect_to_router_second
 856      will be called after the protocol is finished. */
 857   silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
 858                       &protocol, proto_ctx,
 859                       silc_server_connect_to_router_second);
 860   newsocket->protocol = protocol;
 861
 862   /* Register a timeout task that will be executed if the protocol
 863      is not executed within set limit. */
 864   proto_ctx->timeout_task =
 865     silc_schedule_task_add(server->schedule, sock,
 866                            silc_server_timeout_remote,
 867                            server, server->config->key_exchange_timeout, 0,
 868                            SILC_TASK_TIMEOUT,
 869                            SILC_TASK_PRI_LOW);
 870
 871   /* Register the connection for network input and output. This sets
 872      that scheduler will listen for incoming packets for this connection
 873      and sets that outgoing packets may be sent to this connection as
 874      well. However, this doesn't set the scheduler for outgoing traffic,
 875      it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
 876      later when outgoing data is available. */
 877   context = (void *)server;
 878   SILC_REGISTER_CONNECTION_FOR_IO(sock);
 879
 880   /* Run the protocol */
 881   silc_protocol_execute(protocol, server->schedule, 0, 0);
 882 }
 883
 884 /* Timeout callback that will be called to retry connecting to remote
 885    router. This is used by both normal and router server. This will wait
 886    before retrying the connecting. The timeout is generated by exponential
 887    backoff algorithm. */
 888
 889 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
 890 {
 891   SilcServer server = app_context;
 892   SilcServerConnection sconn = (SilcServerConnection)context;
 893   SilcServerConfigRouter *conn = sconn->conn.ref_ptr;
 894   SilcServerConfigConnParams *param =
 895                 (conn->param ? conn->param : &server->config->param);
 896
 897   /* Don't retry if we are shutting down. */
 898   if (server->server_shutdown) {
 899     silc_server_config_unref(&sconn->conn);
 900     silc_free(sconn->remote_host);
 901     silc_free(sconn->backup_replace_ip);
 902     silc_free(sconn);
 903     return;
 904   }
 905
 906   SILC_LOG_INFO(("Retrying connecting to a router"));
 907
 908   /* Calculate next timeout */
 909   if (sconn->retry_count >= 1) {
 910     sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
 911     if (sconn->retry_timeout > param->reconnect_interval_max)
 912       sconn->retry_timeout = param->reconnect_interval_max;
 913   } else {
 914     sconn->retry_timeout = param->reconnect_interval;
 915   }
 916   sconn->retry_count++;
 917   sconn->retry_timeout = sconn->retry_timeout +
 918     silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
 919
 920   /* If we've reached max retry count, give up. */
 921   if ((sconn->retry_count > param->reconnect_count) &&
 922       !param->reconnect_keep_trying) {
 923     SILC_LOG_ERROR(("Could not connect to router, giving up"));
 924     silc_server_config_unref(&sconn->conn);
 925     silc_free(sconn->remote_host);
 926     silc_free(sconn->backup_replace_ip);
 927     silc_free(sconn);
 928     return;
 929   }
 930
 931   SILC_LOG_DEBUG(("Retrying connecting to a router in %d seconds",
 932                   sconn->retry_timeout));
 933
 934   /* We will lookup a fresh pointer later */
 935   silc_server_config_unref(&sconn->conn);
 936
 937   /* Wait one before retrying */
 938   silc_schedule_task_add(server->schedule, 0, silc_server_connect_router,
 939                          context, sconn->retry_timeout, 0,
 940                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
 941 }
 942
 943 /* Generic routine to use connect to a router. */
 944
 945 SILC_TASK_CALLBACK(silc_server_connect_router)
 946 {
 947   SilcServer server = app_context;
 948   SilcServerConnection sconn = (SilcServerConnection)context;
 949   SilcServerConfigRouter *rconn;
 950   int sock;
 951
 952   /* Don't connect if we are shutting down. */
 953   if (server->server_shutdown) {
 954     silc_free(sconn->remote_host);
 955     silc_free(sconn->backup_replace_ip);
 956     silc_free(sconn);
 957     return;
 958   }
 959
 960   SILC_LOG_INFO(("Connecting to the %s %s on port %d",
 961                  (sconn->backup ? "backup router" : "router"),
 962                  sconn->remote_host, sconn->remote_port));
 963
 964   server->router_connect = time(NULL);
 965   rconn = silc_server_config_find_router_conn(server, sconn->remote_host,
 966                                               sconn->remote_port);
 967   if (!rconn) {
 968     SILC_LOG_INFO(("Unconfigured %s connection %s:%d, cannot connect",
 969                    (sconn->backup ? "backup router" : "router"),
 970                    sconn->remote_host, sconn->remote_port));
 971     silc_free(sconn->remote_host);
 972     silc_free(sconn->backup_replace_ip);
 973     silc_free(sconn);
 974     return;
 975   }
 976   silc_server_config_ref(&sconn->conn, server->config, (void *)rconn);
 977
 978   /* Connect to remote host */
 979   sock = silc_net_create_connection(
 980                  (!server->config->server_info->primary ? NULL :
 981                   server->config->server_info->primary->server_ip),
 982                  sconn->remote_port, sconn->remote_host);
 983   if (sock < 0) {
 984     SILC_LOG_ERROR(("Could not connect to router %s:%d",
 985                     sconn->remote_host, sconn->remote_port));
 986     if (!sconn->no_reconnect)
 987       silc_schedule_task_add(server->schedule, 0,
 988                              silc_server_connect_to_router_retry,
 989                              context, 0, 1, SILC_TASK_TIMEOUT,
 990                              SILC_TASK_PRI_NORMAL);
 991     else {
 992       silc_server_config_unref(&sconn->conn);
 993       silc_free(sconn->remote_host);
 994       silc_free(sconn->backup_replace_ip);
 995       silc_free(sconn);
 996     }
 997     return;
 998   }
 999
1000   /* Continue with key exchange protocol */
1001   silc_server_start_key_exchange(server, sconn, sock);
1002 }
1003
1004 /* This function connects to our primary router or if we are a router this
1005    establishes all our primary routes. This is called at the start of the
1006    server to do authentication and key exchange with our router - called
1007    from schedule. */
1008
1009 SILC_TASK_CALLBACK(silc_server_connect_to_router)
1010 {
1011   SilcServer server = (SilcServer)context;
1012   SilcServerConnection sconn;
1013   SilcServerConfigRouter *ptr;
1014
1015   /* Don't connect if we are shutting down. */
1016   if (server->server_shutdown)
1017     return;
1018
1019   SILC_LOG_DEBUG(("We are %s",
1020                   (server->server_type == SILC_SERVER ?
1021                    "normal server" : server->server_type == SILC_ROUTER ?
1022                    "router" : "backup router/normal server")));
1023
1024   if (!server->config->routers) {
1025     /* There wasn't a configured router, we will continue but we don't
1026        have a connection to outside world.  We will be standalone server. */
1027     SILC_LOG_DEBUG(("No router(s), we are standalone"));
1028     server->standalone = TRUE;
1029     return;
1030   }
1031
1032   /* Cancel any possible retry timeouts */
1033   silc_schedule_task_del_by_callback(server->schedule,
1034                                      silc_server_connect_router);
1035   silc_schedule_task_del_by_callback(server->schedule,
1036                                      silc_server_connect_to_router_retry);
1037
1038   /* Create the connections to all our routes */
1039   for (ptr = server->config->routers; ptr; ptr = ptr->next) {
1040
1041     SILC_LOG_DEBUG(("%s connection [%s] %s:%d",
1042                     ptr->backup_router ? "Backup router" : "Router",
1043                     ptr->initiator ? "Initiator" : "Responder",
1044                     ptr->host, ptr->port));
1045
1046     if (server->server_type == SILC_ROUTER && ptr->backup_router &&
1047         ptr->initiator == FALSE && !server->backup_router &&
1048         !silc_server_config_get_backup_router(server))
1049       server->wait_backup = TRUE;
1050
1051     if (ptr->initiator) {
1052       /* Check whether we are connected to this host already */
1053       if (silc_server_num_sockets_by_remote(server,
1054                                             silc_net_is_ip(ptr->host) ?
1055                                             ptr->host : NULL,
1056                                             silc_net_is_ip(ptr->host) ?
1057                                             NULL : ptr->host, ptr->port,
1058                                             SILC_SOCKET_TYPE_ROUTER)) {
1059         SILC_LOG_DEBUG(("We are already connected to this router"));
1060         continue;
1061       }
1062
1063       /* Allocate connection object for hold connection specific stuff. */
1064       sconn = silc_calloc(1, sizeof(*sconn));
1065       sconn->remote_host = strdup(ptr->host);
1066       sconn->remote_port = ptr->port;
1067       sconn->backup = ptr->backup_router;
1068       if (sconn->backup) {
1069         sconn->backup_replace_ip = strdup(ptr->backup_replace_ip);
1070         sconn->backup_replace_port = ptr->backup_replace_port;
1071       }
1072
1073       if (!server->router_conn && !sconn->backup)
1074         server->router_conn = sconn;
1075
1076       silc_schedule_task_add(server->schedule, 0,
1077                              silc_server_connect_router,
1078                              (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
1079                              SILC_TASK_PRI_NORMAL);
1080     }
1081   }
1082 }
1083
1084 /* Second part of connecting to router(s). Key exchange protocol has been
1085    executed and now we will execute authentication protocol. */
1086
1087 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
1088 {
1089   SilcProtocol protocol = (SilcProtocol)context;
1090   SilcServerKEInternalContext *ctx =
1091     (SilcServerKEInternalContext *)protocol->context;
1092   SilcServer server = (SilcServer)ctx->server;
1093   SilcServerConnection sconn = (SilcServerConnection)ctx->context;
1094   SilcSocketConnection sock = ctx->sock;
1095   SilcServerConnAuthInternalContext *proto_ctx;
1096   SilcServerConfigRouter *conn = NULL;
1097
1098   SILC_LOG_DEBUG(("Start"));
1099
1100   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1101       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1102     /* Error occured during protocol */
1103     silc_protocol_free(protocol);
1104     sock->protocol = NULL;
1105     silc_ske_free_key_material(ctx->keymat);
1106     if (ctx->packet)
1107       silc_packet_context_free(ctx->packet);
1108     if (ctx->ske)
1109       silc_ske_free(ctx->ske);
1110     silc_free(ctx->dest_id);
1111     silc_free(ctx);
1112     silc_schedule_task_del_by_callback(server->schedule,
1113                                        silc_server_failure_callback);
1114     silc_server_disconnect_remote(server, sock,
1115                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1116
1117     /* Try reconnecting if configuration wants it */
1118     if (!sconn->no_reconnect) {
1119       silc_schedule_task_add(server->schedule, 0,
1120                              silc_server_connect_to_router_retry,
1121                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1122                              SILC_TASK_PRI_NORMAL);
1123       return;
1124     }
1125
1126     /* Call completion to indicate error */
1127     if (sconn->callback)
1128       (*sconn->callback)(server, NULL, sconn->callback_context);
1129
1130     silc_server_config_unref(&sconn->conn);
1131     silc_free(sconn->remote_host);
1132     silc_free(sconn->backup_replace_ip);
1133     silc_free(sconn);
1134     return;
1135   }
1136
1137   /* We now have the key material as the result of the key exchange
1138      protocol. Take the key material into use. Free the raw key material
1139      as soon as we've set them into use. */
1140   if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1141                                         ctx->sock, ctx->keymat,
1142                                         ctx->ske->prop->cipher,
1143                                         ctx->ske->prop->pkcs,
1144                                         ctx->ske->prop->hash,
1145                                         ctx->ske->prop->hmac,
1146                                         ctx->ske->prop->group,
1147                                         ctx->responder)) {
1148     silc_protocol_free(protocol);
1149     sock->protocol = NULL;
1150     silc_ske_free_key_material(ctx->keymat);
1151     if (ctx->packet)
1152       silc_packet_context_free(ctx->packet);
1153     if (ctx->ske)
1154       silc_ske_free(ctx->ske);
1155     silc_free(ctx->dest_id);
1156     silc_free(ctx);
1157     silc_schedule_task_del_by_callback(server->schedule,
1158                                        silc_server_failure_callback);
1159     silc_server_disconnect_remote(server, sock,
1160                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1161
1162     /* Try reconnecting if configuration wants it */
1163     if (!sconn->no_reconnect) {
1164       silc_schedule_task_add(server->schedule, 0,
1165                              silc_server_connect_to_router_retry,
1166                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1167                              SILC_TASK_PRI_NORMAL);
1168       return;
1169     }
1170
1171     /* Call completion to indicate error */
1172     if (sconn->callback)
1173       (*sconn->callback)(server, NULL, sconn->callback_context);
1174
1175     silc_server_config_unref(&sconn->conn);
1176     silc_free(sconn->remote_host);
1177     silc_free(sconn->backup_replace_ip);
1178     silc_free(sconn);
1179     return;
1180   }
1181   silc_ske_free_key_material(ctx->keymat);
1182
1183   /* Allocate internal context for the authentication protocol. This
1184      is sent as context for the protocol. */
1185   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1186   proto_ctx->server = (void *)server;
1187   proto_ctx->context = (void *)sconn;
1188   proto_ctx->sock = sock;
1189   proto_ctx->ske = ctx->ske;       /* Save SKE object from previous protocol */
1190   proto_ctx->dest_id_type = ctx->dest_id_type;
1191   proto_ctx->dest_id = ctx->dest_id;
1192
1193   /* Resolve the authentication method used in this connection. Check if
1194      we find a match from user configured connections */
1195   if (!sconn->conn.ref_ptr)
1196     conn = silc_server_config_find_router_conn(server, sock->hostname,
1197                                                sock->port);
1198   else
1199     conn = sconn->conn.ref_ptr;
1200
1201   if (conn) {
1202     /* Match found. Use the configured authentication method. Take only
1203        the passphrase, since for public key auth we automatically use
1204        our local key pair. */
1205     if (conn->passphrase) {
1206       if (conn->publickeys && !server->config->prefer_passphrase_auth) {
1207         proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
1208       } else {
1209         proto_ctx->auth_data = strdup(conn->passphrase);
1210         proto_ctx->auth_data_len = strlen(conn->passphrase);
1211         proto_ctx->auth_meth = SILC_AUTH_PASSWORD;
1212       }
1213     } else if (conn->publickeys) {
1214       proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
1215     } else {
1216       proto_ctx->auth_meth = SILC_AUTH_NONE;
1217     }
1218   } else {
1219     SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
1220                     sock->hostname, sock->ip, sock->port));
1221     silc_protocol_free(protocol);
1222     sock->protocol = NULL;
1223     if (ctx->packet)
1224       silc_packet_context_free(ctx->packet);
1225     if (ctx->ske)
1226       silc_ske_free(ctx->ske);
1227     silc_free(ctx->dest_id);
1228     silc_free(ctx);
1229     silc_server_config_unref(&sconn->conn);
1230     silc_free(sconn->remote_host);
1231     silc_free(sconn->backup_replace_ip);
1232     silc_free(sconn);
1233     silc_schedule_task_del_by_callback(server->schedule,
1234                                        silc_server_failure_callback);
1235     silc_server_disconnect_remote(server, sock,
1236                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1237     return;
1238   }
1239
1240   /* Free old protocol as it is finished now */
1241   silc_protocol_free(protocol);
1242   if (ctx->packet)
1243     silc_packet_context_free(ctx->packet);
1244   silc_free(ctx);
1245   sock->protocol = NULL;
1246
1247   /* Allocate the authentication protocol. This is allocated here
1248      but we won't start it yet. We will be receiving party of this
1249      protocol thus we will wait that connecting party will make
1250      their first move. */
1251   silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1252                       &sock->protocol, proto_ctx,
1253                       silc_server_connect_to_router_final);
1254
1255   /* Register timeout task. If the protocol is not executed inside
1256      this timelimit the connection will be terminated. */
1257   proto_ctx->timeout_task =
1258     silc_schedule_task_add(server->schedule, sock->sock,
1259                            silc_server_timeout_remote,
1260                            (void *)server,
1261                            server->config->conn_auth_timeout, 0,
1262                            SILC_TASK_TIMEOUT,
1263                            SILC_TASK_PRI_LOW);
1264
1265   /* Run the protocol */
1266   silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
1267 }
1268
1269 /* Finalizes the connection to router. Registers a server task to the
1270    queue so that we can accept new connections. */
1271
1272 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
1273 {
1274   SilcProtocol protocol = (SilcProtocol)context;
1275   SilcServerConnAuthInternalContext *ctx =
1276     (SilcServerConnAuthInternalContext *)protocol->context;
1277   SilcServer server = (SilcServer)ctx->server;
1278   SilcServerConnection sconn = (SilcServerConnection)ctx->context;
1279   SilcSocketConnection sock = ctx->sock;
1280   SilcServerEntry id_entry = NULL;
1281   SilcBuffer packet;
1282   unsigned char *id_string;
1283   SilcUInt32 id_len;
1284   SilcIDListData idata;
1285   SilcServerConfigRouter *conn = NULL;
1286   SilcServerConfigConnParams *param = NULL;
1287
1288   SILC_LOG_DEBUG(("Start"));
1289
1290   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1291       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1292     /* Error occured during protocol */
1293     silc_free(ctx->dest_id);
1294     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1295                                   NULL);
1296
1297     /* Try reconnecting if configuration wants it */
1298     if (!sconn->no_reconnect) {
1299       silc_schedule_task_add(server->schedule, 0,
1300                              silc_server_connect_to_router_retry,
1301                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1302                              SILC_TASK_PRI_NORMAL);
1303       goto out2;
1304     }
1305
1306     goto out;
1307   }
1308
1309   /* Add a task to the queue. This task receives new connections to the
1310      server. This task remains on the queue until the end of the program. */
1311   if (!server->listenning && !sconn->backup) {
1312     silc_schedule_task_add(server->schedule, server->sock,
1313                            silc_server_accept_new_connection,
1314                            (void *)server, 0, 0,
1315                            SILC_TASK_FD,
1316                            SILC_TASK_PRI_NORMAL);
1317     server->listenning = TRUE;
1318   }
1319
1320   /* Send NEW_SERVER packet to the router. We will become registered
1321      to the SILC network after sending this packet. */
1322   id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
1323   id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
1324   packet = silc_buffer_alloc(2 + 2 + id_len + strlen(server->server_name));
1325   silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
1326   silc_buffer_format(packet,
1327                      SILC_STR_UI_SHORT(id_len),
1328                      SILC_STR_UI_XNSTRING(id_string, id_len),
1329                      SILC_STR_UI_SHORT(strlen(server->server_name)),
1330                      SILC_STR_UI_XNSTRING(server->server_name,
1331                                           strlen(server->server_name)),
1332                      SILC_STR_END);
1333
1334   /* Send the packet */
1335   silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
1336                           packet->data, packet->len, TRUE);
1337   silc_buffer_free(packet);
1338   silc_free(id_string);
1339
1340   SILC_LOG_INFO(("Connected to router %s", sock->hostname));
1341
1342   /* Check that we do not have this ID already */
1343   id_entry = silc_idlist_find_server_by_id(server->local_list,
1344                                            ctx->dest_id, TRUE, NULL);
1345   if (id_entry) {
1346     silc_idcache_del_by_context(server->local_list->servers, id_entry);
1347   } else {
1348     id_entry = silc_idlist_find_server_by_id(server->global_list,
1349                                              ctx->dest_id, TRUE, NULL);
1350     if (id_entry)
1351       silc_idcache_del_by_context(server->global_list->servers, id_entry);
1352   }
1353
1354   SILC_LOG_DEBUG(("New server id(%s)",
1355                   silc_id_render(ctx->dest_id, SILC_ID_SERVER)));
1356
1357   /* Add the connected router to global server list.  Router is sent
1358      as NULL since it's local to us. */
1359   id_entry = silc_idlist_add_server(server->global_list,
1360                                     strdup(sock->hostname),
1361                                     SILC_ROUTER, ctx->dest_id, NULL, sock);
1362   if (!id_entry) {
1363     silc_free(ctx->dest_id);
1364     SILC_LOG_ERROR(("Cannot add new server entry to cache"));
1365     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1366                                   NULL);
1367     goto out;
1368   }
1369
1370   silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1371   silc_free(sock->user_data);
1372   sock->user_data = (void *)id_entry;
1373   sock->type = SILC_SOCKET_TYPE_ROUTER;
1374   idata = (SilcIDListData)sock->user_data;
1375   idata->status |= (SILC_IDLIST_STATUS_REGISTERED |
1376                     SILC_IDLIST_STATUS_LOCAL);
1377
1378   conn = sconn->conn.ref_ptr;
1379   param = &server->config->param;
1380   if (conn && conn->param)
1381     param = conn->param;
1382
1383   /* Perform keepalive. */
1384   silc_socket_set_heartbeat(sock, param->keepalive_secs, server,
1385                             silc_server_perform_heartbeat,
1386                             server->schedule);
1387
1388   /* Register re-key timeout */
1389   idata->rekey->timeout = param->key_exchange_rekey;
1390   silc_schedule_task_add(server->schedule, sock->sock,
1391                          silc_server_rekey_callback,
1392                          (void *)sock, idata->rekey->timeout, 0,
1393                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1394
1395   if (!sconn->backup) {
1396     /* Mark this router our primary router if we're still standalone */
1397     if (server->standalone) {
1398       SILC_LOG_DEBUG(("This connection is our primary router"));
1399       server->id_entry->router = id_entry;
1400       server->router = id_entry;
1401       server->standalone = FALSE;
1402
1403       /* If we are router then announce our possible servers.  Backup
1404          router announces also global servers. */
1405       if (server->server_type == SILC_ROUTER)
1406         silc_server_announce_servers(server,
1407                                      server->backup_router ? TRUE : FALSE,
1408                                      0, SILC_PRIMARY_ROUTE(server));
1409
1410       /* Announce our clients and channels to the router */
1411       silc_server_announce_clients(server, 0, SILC_PRIMARY_ROUTE(server));
1412       silc_server_announce_channels(server, 0, SILC_PRIMARY_ROUTE(server));
1413
1414       /* If we are backup router then this primary router is whom we are
1415          backing up. */
1416       if (server->server_type == SILC_BACKUP_ROUTER)
1417         silc_server_backup_add(server, server->id_entry, sock->ip,
1418                                sconn->remote_port, TRUE);
1419     }
1420   } else {
1421     /* Add this server to be our backup router */
1422     silc_server_backup_add(server, id_entry, sconn->backup_replace_ip,
1423                            sconn->backup_replace_port, FALSE);
1424   }
1425
1426   sock->protocol = NULL;
1427
1428  out:
1429   /* Call the completion callback to indicate that we've connected to
1430      the router */
1431   if (sconn && sconn->callback)
1432     (*sconn->callback)(server, id_entry, sconn->callback_context);
1433
1434   /* Free the temporary connection data context */
1435   if (sconn) {
1436     silc_server_config_unref(&sconn->conn);
1437     silc_free(sconn->remote_host);
1438     silc_free(sconn->backup_replace_ip);
1439     silc_free(sconn);
1440   }
1441   if (sconn == server->router_conn)
1442     server->router_conn = NULL;
1443
1444  out2:
1445   /* Free the protocol object */
1446   if (sock->protocol == protocol)
1447     sock->protocol = NULL;
1448   silc_protocol_free(protocol);
1449   if (ctx->packet)
1450     silc_packet_context_free(ctx->packet);
1451   if (ctx->ske)
1452     silc_ske_free(ctx->ske);
1453   if (ctx->auth_meth == SILC_AUTH_PASSWORD)
1454     silc_free(ctx->auth_data);
1455   silc_free(ctx);
1456 }
1457
1458 /* Host lookup callback that is called after the incoming connection's
1459    IP and FQDN lookup is performed. This will actually check the acceptance
1460    of the incoming connection and will register the key exchange protocol
1461    for this connection. */
1462
1463 static void
1464 silc_server_accept_new_connection_lookup(SilcSocketConnection sock,
1465                                          void *context)
1466 {
1467   SilcServerKEInternalContext *proto_ctx =
1468     (SilcServerKEInternalContext *)context;
1469   SilcServer server = (SilcServer)proto_ctx->server;
1470   SilcServerConfigClient *cconfig = NULL;
1471   SilcServerConfigServer *sconfig = NULL;
1472   SilcServerConfigRouter *rconfig = NULL;
1473   SilcServerConfigDeny *deny;
1474   int port;
1475
1476   /* Check whether we could resolve both IP and FQDN. */
1477   if (!sock->ip || (!strcmp(sock->ip, sock->hostname) &&
1478                     server->config->require_reverse_lookup)) {
1479     SILC_LOG_ERROR(("IP/DNS lookup failed %s",
1480                     sock->hostname ? sock->hostname :
1481                     sock->ip ? sock->ip : ""));
1482     server->stat.conn_failures++;
1483     silc_server_disconnect_remote(server, sock,
1484                                   SILC_STATUS_ERR_INCOMPLETE_INFORMATION,
1485                                   "Unknown host or IP");
1486     silc_free(proto_ctx);
1487     return;
1488   }
1489
1490   /* Register the connection for network input and output. This sets
1491      that scheduler will listen for incoming packets for this connection
1492      and sets that outgoing packets may be sent to this connection as well.
1493      However, this doesn't set the scheduler for outgoing traffic, it
1494      will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1495      later when outgoing data is available. */
1496   context = (void *)server;
1497   SILC_REGISTER_CONNECTION_FOR_IO(sock->sock);
1498
1499   SILC_LOG_INFO(("Incoming connection %s (%s)", sock->hostname,
1500                  sock->ip));
1501
1502   /* Listenning port */
1503   if (!server->sockets[(SilcUInt32)proto_ctx->context]) {
1504     silc_server_disconnect_remote(server, sock,
1505                                   SILC_STATUS_ERR_RESOURCE_LIMIT,
1506                                   "Connection refused");
1507     server->stat.conn_failures++;
1508     silc_free(proto_ctx);
1509     return;
1510   }
1511   port = server->sockets[(SilcUInt32)proto_ctx->context]->port;
1512
1513   /* Check whether this connection is denied to connect to us. */
1514   deny = silc_server_config_find_denied(server, sock->ip);
1515   if (!deny)
1516     deny = silc_server_config_find_denied(server, sock->hostname);
1517   if (deny) {
1518     /* The connection is denied */
1519     SILC_LOG_INFO(("Connection %s (%s) is denied",
1520                    sock->hostname, sock->ip));
1521     silc_server_disconnect_remote(server, sock,
1522                                   SILC_STATUS_ERR_BANNED_FROM_SERVER,
1523                                   deny->reason);
1524     server->stat.conn_failures++;
1525     silc_free(proto_ctx);
1526     return;
1527   }
1528
1529   /* Check whether we have configured this sort of connection at all. We
1530      have to check all configurations since we don't know what type of
1531      connection this is. */
1532   if (!(cconfig = silc_server_config_find_client(server, sock->ip)))
1533     cconfig = silc_server_config_find_client(server, sock->hostname);
1534   if (!(sconfig = silc_server_config_find_server_conn(server, sock->ip)))
1535     sconfig = silc_server_config_find_server_conn(server, sock->hostname);
1536   if (server->server_type == SILC_ROUTER) {
1537     if (!(rconfig = silc_server_config_find_router_conn(server,
1538                                                         sock->ip, sock->port)))
1539       rconfig = silc_server_config_find_router_conn(server, sock->hostname,
1540                                                     sock->port);
1541   }
1542   if (!cconfig && !sconfig && !rconfig) {
1543     SILC_LOG_INFO(("Connection %s (%s) is not allowed", sock->hostname,
1544                    sock->ip));
1545     silc_server_disconnect_remote(server, sock,
1546                                   SILC_STATUS_ERR_BANNED_FROM_SERVER, NULL);
1547     server->stat.conn_failures++;
1548     silc_free(proto_ctx);
1549     return;
1550   }
1551
1552   /* The connection is allowed */
1553
1554   /* Set internal context for key exchange protocol. This is
1555      sent as context for the protocol. */
1556   proto_ctx->sock = sock;
1557   proto_ctx->rng = server->rng;
1558   proto_ctx->responder = TRUE;
1559   silc_server_config_ref(&proto_ctx->cconfig, server->config, cconfig);
1560   silc_server_config_ref(&proto_ctx->sconfig, server->config, sconfig);
1561   silc_server_config_ref(&proto_ctx->rconfig, server->config, rconfig);
1562
1563   /* Take flags for key exchange. Since we do not know what type of connection
1564      this is, we go through all found configurations and use the global ones
1565      as well. This will result always into strictest key exchange flags. */
1566   SILC_GET_SKE_FLAGS(cconfig, proto_ctx);
1567   SILC_GET_SKE_FLAGS(sconfig, proto_ctx);
1568   SILC_GET_SKE_FLAGS(rconfig, proto_ctx);
1569   if (server->config->param.key_exchange_pfs)
1570     proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
1571
1572   /* Prepare the connection for key exchange protocol. We allocate the
1573      protocol but will not start it yet. The connector will be the
1574      initiator of the protocol thus we will wait for initiation from
1575      there before we start the protocol. */
1576   server->stat.auth_attempts++;
1577   SILC_LOG_DEBUG(("Starting key exchange protocol"));
1578   silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1579                       &sock->protocol, proto_ctx,
1580                       silc_server_accept_new_connection_second);
1581
1582   /* Register a timeout task that will be executed if the connector
1583      will not start the key exchange protocol within specified timeout
1584      and the connection will be closed. */
1585   proto_ctx->timeout_task =
1586     silc_schedule_task_add(server->schedule, sock->sock,
1587                            silc_server_timeout_remote,
1588                            (void *)server,
1589                            server->config->key_exchange_timeout, 0,
1590                            SILC_TASK_TIMEOUT,
1591                            SILC_TASK_PRI_LOW);
1592 }
1593
1594 /* Accepts new connections to the server. Accepting new connections are
1595    done in three parts to make it async. */
1596
1597 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
1598 {
1599   SilcServer server = (SilcServer)context;
1600   SilcSocketConnection newsocket;
1601   SilcServerKEInternalContext *proto_ctx;
1602   int sock;
1603
1604   SILC_LOG_DEBUG(("Accepting new connection"));
1605
1606   server->stat.conn_attempts++;
1607
1608   sock = silc_net_accept_connection(fd);
1609   if (sock < 0) {
1610     SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
1611     server->stat.conn_failures++;
1612     return;
1613   }
1614
1615   /* Check for maximum allowed connections */
1616   if (sock > server->config->param.connections_max) {
1617     SILC_LOG_ERROR(("Refusing connection, server is full"));
1618     server->stat.conn_failures++;
1619     silc_net_close_connection(sock);
1620     return;
1621   }
1622
1623   /* Set socket options */
1624   silc_net_set_socket_nonblock(sock);
1625   silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
1626
1627   /* We don't create a ID yet, since we don't know what type of connection
1628      this is yet. But, we do add the connection to the socket table. */
1629   silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
1630   server->sockets[sock] = newsocket;
1631
1632   /* Perform asynchronous host lookup. This will lookup the IP and the
1633      FQDN of the remote connection. After the lookup is done the connection
1634      is accepted further. */
1635   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1636   proto_ctx->server = server;
1637   proto_ctx->context = (void *)fd;
1638   silc_socket_host_lookup(newsocket, TRUE,
1639                           silc_server_accept_new_connection_lookup,
1640                           (void *)proto_ctx, server->schedule);
1641 }
1642
1643 /* Second part of accepting new connection. Key exchange protocol has been
1644    performed and now it is time to do little connection authentication
1645    protocol to figure out whether this connection is client or server
1646    and whether it has right to access this server (especially server
1647    connections needs to be authenticated). */
1648
1649 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1650 {
1651   SilcProtocol protocol = (SilcProtocol)context;
1652   SilcServerKEInternalContext *ctx =
1653     (SilcServerKEInternalContext *)protocol->context;
1654   SilcServer server = (SilcServer)ctx->server;
1655   SilcSocketConnection sock = ctx->sock;
1656   SilcServerConnAuthInternalContext *proto_ctx;
1657
1658   SILC_LOG_DEBUG(("Start"));
1659
1660   if ((protocol->state == SILC_PROTOCOL_STATE_ERROR) ||
1661       (protocol->state == SILC_PROTOCOL_STATE_FAILURE)) {
1662     /* Error occured during protocol */
1663     SILC_LOG_DEBUG(("Error key exchange protocol"));
1664     silc_protocol_free(protocol);
1665     sock->protocol = NULL;
1666     silc_ske_free_key_material(ctx->keymat);
1667     if (ctx->packet)
1668       silc_packet_context_free(ctx->packet);
1669     if (ctx->ske)
1670       silc_ske_free(ctx->ske);
1671     silc_free(ctx->dest_id);
1672     silc_server_config_unref(&ctx->cconfig);
1673     silc_server_config_unref(&ctx->sconfig);
1674     silc_server_config_unref(&ctx->rconfig);
1675     silc_free(ctx);
1676     silc_schedule_task_del_by_callback(server->schedule,
1677                                        silc_server_failure_callback);
1678     silc_server_disconnect_remote(server, sock,
1679                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
1680                                   NULL);
1681     server->stat.auth_failures++;
1682     return;
1683   }
1684
1685   /* We now have the key material as the result of the key exchange
1686      protocol. Take the key material into use. Free the raw key material
1687      as soon as we've set them into use. */
1688   if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1689                                         ctx->sock, ctx->keymat,
1690                                         ctx->ske->prop->cipher,
1691                                         ctx->ske->prop->pkcs,
1692                                         ctx->ske->prop->hash,
1693                                         ctx->ske->prop->hmac,
1694                                         ctx->ske->prop->group,
1695                                         ctx->responder)) {
1696     SILC_LOG_ERROR(("Error setting key material in use"));
1697     silc_protocol_free(protocol);
1698     sock->protocol = NULL;
1699     silc_ske_free_key_material(ctx->keymat);
1700     if (ctx->packet)
1701       silc_packet_context_free(ctx->packet);
1702     if (ctx->ske)
1703       silc_ske_free(ctx->ske);
1704     silc_free(ctx->dest_id);
1705     silc_server_config_unref(&ctx->cconfig);
1706     silc_server_config_unref(&ctx->sconfig);
1707     silc_server_config_unref(&ctx->rconfig);
1708     silc_free(ctx);
1709     silc_schedule_task_del_by_callback(server->schedule,
1710                                        silc_server_failure_callback);
1711     silc_server_disconnect_remote(server, sock,
1712                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1713     server->stat.auth_failures++;
1714     return;
1715   }
1716   silc_ske_free_key_material(ctx->keymat);
1717
1718   /* Allocate internal context for the authentication protocol. This
1719      is sent as context for the protocol. */
1720   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1721   proto_ctx->server = (void *)server;
1722   proto_ctx->sock = sock;
1723   proto_ctx->ske = ctx->ske;    /* Save SKE object from previous protocol */
1724   proto_ctx->responder = TRUE;
1725   proto_ctx->dest_id_type = ctx->dest_id_type;
1726   proto_ctx->dest_id = ctx->dest_id;
1727   proto_ctx->cconfig = ctx->cconfig;
1728   proto_ctx->sconfig = ctx->sconfig;
1729   proto_ctx->rconfig = ctx->rconfig;
1730
1731   /* Free old protocol as it is finished now */
1732   silc_protocol_free(protocol);
1733   if (ctx->packet)
1734     silc_packet_context_free(ctx->packet);
1735   silc_free(ctx);
1736   sock->protocol = NULL;
1737
1738   /* Allocate the authentication protocol. This is allocated here
1739      but we won't start it yet. We will be receiving party of this
1740      protocol thus we will wait that connecting party will make
1741      their first move. */
1742   SILC_LOG_DEBUG(("Starting connection authentication protocol"));
1743   silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1744                       &sock->protocol, proto_ctx,
1745                       silc_server_accept_new_connection_final);
1746
1747   /* Register timeout task. If the protocol is not executed inside
1748      this timelimit the connection will be terminated. */
1749   proto_ctx->timeout_task =
1750     silc_schedule_task_add(server->schedule, sock->sock,
1751                            silc_server_timeout_remote,
1752                            (void *)server,
1753                            server->config->conn_auth_timeout, 0,
1754                            SILC_TASK_TIMEOUT,
1755                            SILC_TASK_PRI_LOW);
1756 }
1757
1758 /* After this is called, server don't wait for backup router anymore.
1759    This gets called automatically even after we have backup router
1760    connection established. */
1761
1762 SILC_TASK_CALLBACK(silc_server_backup_router_wait)
1763 {
1764   SilcServer server = context;
1765   server->wait_backup = FALSE;
1766 }
1767
1768 /* Final part of accepting new connection. The connection has now
1769    been authenticated and keys has been exchanged. We also know whether
1770    this is client or server connection. */
1771
1772 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1773 {
1774   SilcProtocol protocol = (SilcProtocol)context;
1775   SilcServerConnAuthInternalContext *ctx =
1776     (SilcServerConnAuthInternalContext *)protocol->context;
1777   SilcServer server = (SilcServer)ctx->server;
1778   SilcSocketConnection sock = ctx->sock;
1779   SilcUnknownEntry entry = (SilcUnknownEntry)sock->user_data;
1780   void *id_entry;
1781   SilcServerConfigConnParams *param = &server->config->param;
1782
1783   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1784       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1785     /* Error occured during protocol */
1786     SILC_LOG_DEBUG(("Error during authentication protocol"));
1787     silc_protocol_free(protocol);
1788     sock->protocol = NULL;
1789     if (ctx->packet)
1790       silc_packet_context_free(ctx->packet);
1791     if (ctx->ske)
1792       silc_ske_free(ctx->ske);
1793     silc_free(ctx->dest_id);
1794     silc_server_config_unref(&ctx->cconfig);
1795     silc_server_config_unref(&ctx->sconfig);
1796     silc_server_config_unref(&ctx->rconfig);
1797     silc_free(ctx);
1798     silc_schedule_task_del_by_callback(server->schedule,
1799                                        silc_server_failure_callback);
1800     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1801                                   NULL);
1802     server->stat.auth_failures++;
1803     return;
1804   }
1805
1806   entry->data.last_receive = time(NULL);
1807
1808   switch (ctx->conn_type) {
1809   case SILC_SOCKET_TYPE_CLIENT:
1810     {
1811       SilcClientEntry client;
1812       SilcServerConfigClient *conn = ctx->cconfig.ref_ptr;
1813
1814       /* Verify whether this connection is after all allowed to connect */
1815       if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1816                                           &server->config->param,
1817                                           conn->param, ctx->ske)) {
1818         server->stat.auth_failures++;
1819         goto out;
1820       }
1821
1822       /* If we are primary router and we have backup router configured
1823          but it has not connected to use yet, do not accept any other
1824          connection. */
1825       if (server->wait_backup && server->server_type == SILC_ROUTER &&
1826           !server->backup_router) {
1827         SilcServerConfigRouter *router;
1828         router = silc_server_config_get_backup_router(server);
1829         if (router && strcmp(server->config->server_info->primary->server_ip,
1830                              sock->ip) &&
1831             silc_server_find_socket_by_host(server,
1832                                             SILC_SOCKET_TYPE_SERVER,
1833                                             router->backup_replace_ip, 0)) {
1834           SILC_LOG_INFO(("Will not accept connections because we do "
1835                          "not have backup router connection established"));
1836           silc_server_disconnect_remote(server, sock,
1837                                         SILC_STATUS_ERR_PERM_DENIED,
1838                                         "We do not have connection to backup "
1839                                         "router established, try later");
1840           silc_free(sock->user_data);
1841           server->stat.auth_failures++;
1842
1843           /* From here on, wait 10 seconds for the backup router to appear. */
1844           silc_schedule_task_add(server->schedule, 0,
1845                                  silc_server_backup_router_wait,
1846                                  (void *)server, 10, 0,
1847                                  SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1848           goto out;
1849         }
1850       }
1851
1852       SILC_LOG_DEBUG(("Remote host is client"));
1853       SILC_LOG_INFO(("Connection %s (%s) is client", sock->hostname,
1854                      sock->ip));
1855
1856       /* Add the client to the client ID cache. The nickname and Client ID
1857          and other information is created after we have received NEW_CLIENT
1858          packet from client. */
1859       client = silc_idlist_add_client(server->local_list,
1860                                       NULL, NULL, NULL, NULL, NULL, sock, 0);
1861       if (!client) {
1862         SILC_LOG_ERROR(("Could not add new client to cache"));
1863         silc_free(sock->user_data);
1864         silc_server_disconnect_remote(server, sock,
1865                                       SILC_STATUS_ERR_AUTH_FAILED, NULL);
1866         server->stat.auth_failures++;
1867         goto out;
1868       }
1869       entry->data.status |= SILC_IDLIST_STATUS_LOCAL;
1870
1871       /* Statistics */
1872       server->stat.my_clients++;
1873       server->stat.clients++;
1874       server->stat.cell_clients++;
1875
1876       /* Get connection parameters */
1877       if (conn->param) {
1878         param = conn->param;
1879
1880         if (!param->keepalive_secs)
1881           param->keepalive_secs = server->config->param.keepalive_secs;
1882
1883         if (!param->qos && server->config->param.qos) {
1884           param->qos = server->config->param.qos;
1885           param->qos_rate_limit = server->config->param.qos_rate_limit;
1886           param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1887           param->qos_limit_sec = server->config->param.qos_limit_sec;
1888           param->qos_limit_usec = server->config->param.qos_limit_usec;
1889         }
1890
1891         /* Check if to be anonymous connection */
1892         if (param->anonymous)
1893           client->mode |= SILC_UMODE_ANONYMOUS;
1894       }
1895
1896       id_entry = (void *)client;
1897       break;
1898     }
1899   case SILC_SOCKET_TYPE_SERVER:
1900   case SILC_SOCKET_TYPE_ROUTER:
1901     {
1902       SilcServerEntry new_server;
1903       bool initiator = FALSE;
1904       bool backup_local = FALSE;
1905       bool backup_router = FALSE;
1906       char *backup_replace_ip = NULL;
1907       SilcUInt16 backup_replace_port = 0;
1908       SilcServerConfigServer *sconn = ctx->sconfig.ref_ptr;
1909       SilcServerConfigRouter *rconn = ctx->rconfig.ref_ptr;
1910
1911       /* If we are backup router and this is incoming server connection
1912          and we do not have connection to primary router, do not allow
1913          the connection. */
1914       if (server->server_type == SILC_BACKUP_ROUTER &&
1915           ctx->conn_type == SILC_SOCKET_TYPE_SERVER &&
1916           !SILC_PRIMARY_ROUTE(server)) {
1917         SILC_LOG_INFO(("Will not accept server connection because we do "
1918                        "not have primary router connection established"));
1919         silc_server_disconnect_remote(server, sock,
1920                                       SILC_STATUS_ERR_PERM_DENIED,
1921                                       "We do not have connection to primary "
1922                                       "router established, try later");
1923         silc_free(sock->user_data);
1924         server->stat.auth_failures++;
1925         goto out;
1926       }
1927
1928       if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
1929         /* Verify whether this connection is after all allowed to connect */
1930         if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1931                                             &server->config->param,
1932                                             rconn ? rconn->param : NULL,
1933                                             ctx->ske)) {
1934           silc_free(sock->user_data);
1935           server->stat.auth_failures++;
1936           goto out;
1937         }
1938
1939         if (rconn) {
1940           if (rconn->param) {
1941             param = rconn->param;
1942
1943             if (!param->keepalive_secs)
1944               param->keepalive_secs = server->config->param.keepalive_secs;
1945
1946             if (!param->qos && server->config->param.qos) {
1947               param->qos = server->config->param.qos;
1948               param->qos_rate_limit = server->config->param.qos_rate_limit;
1949               param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1950               param->qos_limit_sec = server->config->param.qos_limit_sec;
1951               param->qos_limit_usec = server->config->param.qos_limit_usec;
1952             }
1953           }
1954
1955           initiator = rconn->initiator;
1956           backup_local = rconn->backup_local;
1957           backup_router = rconn->backup_router;
1958           backup_replace_ip = rconn->backup_replace_ip;
1959           backup_replace_port = rconn->backup_replace_port;
1960         }
1961       }
1962
1963       if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
1964         /* Verify whether this connection is after all allowed to connect */
1965         if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1966                                             &server->config->param,
1967                                             sconn ? sconn->param : NULL,
1968                                             ctx->ske)) {
1969           silc_free(sock->user_data);
1970           server->stat.auth_failures++;
1971           goto out;
1972         }
1973         if (sconn) {
1974           if (sconn->param) {
1975             param = sconn->param;
1976
1977             if (!param->keepalive_secs)
1978               param->keepalive_secs = server->config->param.keepalive_secs;
1979
1980             if (!param->qos && server->config->param.qos) {
1981               param->qos = server->config->param.qos;
1982               param->qos_rate_limit = server->config->param.qos_rate_limit;
1983               param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1984               param->qos_limit_sec = server->config->param.qos_limit_sec;
1985               param->qos_limit_usec = server->config->param.qos_limit_usec;
1986             }
1987           }
1988
1989           backup_router = sconn->backup_router;
1990         }
1991       }
1992
1993       /* If we are primary router and we have backup router configured
1994          but it has not connected to use yet, do not accept any other
1995          connection. */
1996       if (server->wait_backup && server->server_type == SILC_ROUTER &&
1997           !server->backup_router && !backup_router) {
1998         SilcServerConfigRouter *router;
1999         router = silc_server_config_get_backup_router(server);
2000         if (router && strcmp(server->config->server_info->primary->server_ip,
2001                              sock->ip) &&
2002             silc_server_find_socket_by_host(server,
2003                                             SILC_SOCKET_TYPE_SERVER,
2004                                             router->backup_replace_ip, 0)) {
2005           SILC_LOG_INFO(("Will not accept connections because we do "
2006                          "not have backup router connection established"));
2007           silc_server_disconnect_remote(server, sock,
2008                                         SILC_STATUS_ERR_PERM_DENIED,
2009                                         "We do not have connection to backup "
2010                                         "router established, try later");
2011           silc_free(sock->user_data);
2012           server->stat.auth_failures++;
2013
2014           /* From here on, wait 10 seconds for the backup router to appear. */
2015           silc_schedule_task_add(server->schedule, 0,
2016                                  silc_server_backup_router_wait,
2017                                  (void *)server, 10, 0,
2018                                  SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2019           goto out;
2020         }
2021       }
2022
2023       SILC_LOG_DEBUG(("Remote host is %s",
2024                       ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2025                       "server" : (backup_router ?
2026                                   "backup router" : "router")));
2027       SILC_LOG_INFO(("Connection %s (%s) is %s", sock->hostname,
2028                      sock->ip, ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2029                      "server" : (backup_router ?
2030                                  "backup router" : "router")));
2031
2032       /* Add the server into server cache. The server name and Server ID
2033          is updated after we have received NEW_SERVER packet from the
2034          server. We mark ourselves as router for this server if we really
2035          are router. */
2036       new_server =
2037         silc_idlist_add_server((ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2038                                 server->local_list : (backup_router ?
2039                                                       server->local_list :
2040                                                       server->global_list)),
2041                                NULL,
2042                                (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2043                                 SILC_SERVER : SILC_ROUTER),
2044                                NULL,
2045                                (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2046                                 server->id_entry : (backup_router ?
2047                                                     server->id_entry : NULL)),
2048                                sock);
2049       if (!new_server) {
2050         SILC_LOG_ERROR(("Could not add new server to cache"));
2051         silc_free(sock->user_data);
2052         silc_server_disconnect_remote(server, sock,
2053                                       SILC_STATUS_ERR_AUTH_FAILED, NULL);
2054         server->stat.auth_failures++;
2055         goto out;
2056       }
2057       entry->data.status |= SILC_IDLIST_STATUS_LOCAL;
2058
2059       id_entry = (void *)new_server;
2060
2061       /* If the incoming connection is router and marked as backup router
2062          then add it to be one of our backups */
2063       if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER && backup_router) {
2064         /* Change it back to SERVER type since that's what it really is. */
2065         if (backup_local)
2066           ctx->conn_type = SILC_SOCKET_TYPE_SERVER;
2067         new_server->server_type = SILC_BACKUP_ROUTER;
2068
2069         SILC_SERVER_SEND_OPERS(server, FALSE, TRUE, SILC_NOTIFY_TYPE_NONE,
2070                                ("Backup router %s is now online",
2071                                 sock->hostname));
2072
2073         /* Remove the backup waiting with timeout */
2074         silc_schedule_task_add(server->schedule, 0,
2075                                silc_server_backup_router_wait,
2076                                (void *)server, 5, 0,
2077                                SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2078       }
2079
2080       /* Statistics */
2081       if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
2082         server->stat.my_servers++;
2083       } else {
2084         server->stat.my_routers++;
2085         server->stat.routers++;
2086       }
2087       server->stat.servers++;
2088
2089       /* Check whether this connection is to be our primary router connection
2090          if we do not already have the primary route. */
2091       if (!backup_router &&
2092           server->standalone && ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
2093         if (silc_server_config_is_primary_route(server) && !initiator)
2094           break;
2095
2096         SILC_LOG_DEBUG(("We are not standalone server anymore"));
2097         server->standalone = FALSE;
2098         if (!server->id_entry->router) {
2099           server->id_entry->router = id_entry;
2100           server->router = id_entry;
2101         }
2102       }
2103
2104       break;
2105     }
2106   default:
2107     goto out;
2108     break;
2109   }
2110
2111   sock->type = ctx->conn_type;
2112
2113   /* Add the common data structure to the ID entry. */
2114   silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
2115
2116   /* Add to sockets internal pointer for fast referencing */
2117   silc_free(sock->user_data);
2118   sock->user_data = id_entry;
2119
2120   /* Connection has been fully established now. Everything is ok. */
2121   SILC_LOG_DEBUG(("New connection authenticated"));
2122
2123   /* Perform keepalive. */
2124   if (param->keepalive_secs)
2125     silc_socket_set_heartbeat(sock, param->keepalive_secs, server,
2126                               silc_server_perform_heartbeat,
2127                               server->schedule);
2128
2129   /* Perform Quality of Service */
2130   if (param->qos)
2131     silc_socket_set_qos(sock, param->qos_rate_limit, param->qos_bytes_limit,
2132                         param->qos_limit_sec, param->qos_limit_usec,
2133                         server->schedule);
2134
2135  out:
2136   silc_schedule_task_del_by_callback(server->schedule,
2137                                      silc_server_failure_callback);
2138   silc_protocol_free(protocol);
2139   if (ctx->packet)
2140     silc_packet_context_free(ctx->packet);
2141   if (ctx->ske)
2142     silc_ske_free(ctx->ske);
2143   silc_free(ctx->dest_id);
2144   silc_server_config_unref(&ctx->cconfig);
2145   silc_server_config_unref(&ctx->sconfig);
2146   silc_server_config_unref(&ctx->rconfig);
2147   silc_free(ctx);
2148   sock->protocol = NULL;
2149 }
2150
2151 /* This function is used to read packets from network and send packets to
2152    network. This is usually a generic task. */
2153
2154 SILC_TASK_CALLBACK(silc_server_packet_process)
2155 {
2156   SilcServer server = (SilcServer)context;
2157   SilcSocketConnection sock = server->sockets[fd];
2158   SilcIDListData idata;
2159   SilcCipher cipher = NULL;
2160   SilcHmac hmac = NULL;
2161   SilcUInt32 sequence = 0;
2162   int ret;
2163
2164   if (!sock) {
2165     SILC_LOG_DEBUG(("Unknown socket connection"));
2166     return;
2167   }
2168
2169   /* Packet sending */
2170
2171   if (type == SILC_TASK_WRITE) {
2172     /* Do not send data to disconnected connection */
2173     if (SILC_IS_DISCONNECTED(sock)) {
2174       SILC_LOG_DEBUG(("Disconnected socket connection, cannot send"));
2175       return;
2176     }
2177
2178     server->stat.packets_sent++;
2179
2180     /* Send the packet */
2181     ret = silc_packet_send(sock, TRUE);
2182
2183     /* If returned -2 could not write to connection now, will do
2184        it later. */
2185     if (ret == -2)
2186       return;
2187
2188     if (ret == -1) {
2189       SILC_LOG_ERROR(("Error sending packet to connection "
2190                       "%s:%d [%s]", sock->hostname, sock->port,
2191                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2192                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2193                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2194                        "Router")));
2195       return;
2196     }
2197
2198     /* The packet has been sent and now it is time to set the connection
2199        back to only for input. When there is again some outgoing data
2200        available for this connection it will be set for output as well.
2201        This call clears the output setting and sets it only for input. */
2202     SILC_SET_CONNECTION_FOR_INPUT(server->schedule, fd);
2203     SILC_UNSET_OUTBUF_PENDING(sock);
2204
2205     silc_buffer_clear(sock->outbuf);
2206     return;
2207   }
2208
2209   /* Packet receiving */
2210
2211   /* Read some data from connection */
2212   ret = silc_packet_receive(sock);
2213   if (ret < 0) {
2214
2215     if (ret == -1)
2216       SILC_LOG_ERROR(("Error receiving packet from connection "
2217                       "%s:%d [%s] %s", sock->hostname, sock->port,
2218                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2219                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2220                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2221                        "Router"), strerror(errno)));
2222     return;
2223   }
2224
2225   /* EOF */
2226   if (ret == 0) {
2227     SILC_LOG_DEBUG(("Read EOF"));
2228
2229     /* If connection is disconnecting already we will finally
2230        close the connection */
2231     if (SILC_IS_DISCONNECTING(sock)) {
2232       if (sock->user_data)
2233         silc_server_free_sock_user_data(server, sock, NULL);
2234       silc_server_close_connection(server, sock);
2235       return;
2236     }
2237
2238     SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
2239     SILC_SET_DISCONNECTING(sock);
2240
2241     if (sock->user_data) {
2242       char tmp[128];
2243       if (silc_socket_get_error(sock, tmp, sizeof(tmp) - 1))
2244         silc_server_free_sock_user_data(server, sock, tmp);
2245       else
2246         silc_server_free_sock_user_data(server, sock, NULL);
2247     } else if (server->router_conn && server->router_conn->sock == sock &&
2248              !server->router && server->standalone)
2249       silc_schedule_task_add(server->schedule, 0,
2250                              silc_server_connect_to_router,
2251                              server, 1, 0,
2252                              SILC_TASK_TIMEOUT,
2253                              SILC_TASK_PRI_NORMAL);
2254
2255     silc_server_close_connection(server, sock);
2256     return;
2257   }
2258
2259   /* If connection is disconnecting or disconnected we will ignore
2260      what we read. */
2261   if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
2262     SILC_LOG_DEBUG(("Ignoring read data from disconnected connection"));
2263     return;
2264   }
2265
2266   /* Get keys and stuff from ID entry */
2267   idata = (SilcIDListData)sock->user_data;
2268   if (idata) {
2269     cipher = idata->receive_key;
2270     hmac = idata->hmac_receive;
2271     sequence = idata->psn_receive;
2272   }
2273
2274   /* Process the packet. This will call the parser that will then
2275      decrypt and parse the packet. */
2276   ret = silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
2277                                     TRUE : FALSE, cipher, hmac, sequence,
2278                                     silc_server_packet_parse, server);
2279
2280   /* If processing failed the connection is closed. */
2281   if (!ret) {
2282     /* On packet processing errors we may close our primary router
2283        connection but won't become primary router if we are the backup
2284        since this is local error condition. */
2285     if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2286       server->backup_noswitch = TRUE;
2287
2288     if (sock->user_data)
2289       silc_server_free_sock_user_data(server, sock, NULL);
2290     silc_server_close_connection(server, sock);
2291   }
2292 }
2293
2294 /* Parses whole packet, received earlier. */
2295
2296 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
2297 {
2298   SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
2299   SilcServer server = (SilcServer)parse_ctx->context;
2300   SilcSocketConnection sock = parse_ctx->sock;
2301   SilcPacketContext *packet = parse_ctx->packet;
2302   SilcIDListData idata = (SilcIDListData)sock->user_data;
2303   int ret;
2304
2305   server->stat.packets_received++;
2306
2307   /* Parse the packet */
2308   if (parse_ctx->normal)
2309     ret = silc_packet_parse(packet, idata ? idata->receive_key : NULL);
2310   else
2311     ret = silc_packet_parse_special(packet, idata ? idata->receive_key : NULL);
2312
2313   /* If entry is disabled ignore what we got. */
2314   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED &&
2315       ret != SILC_PACKET_HEARTBEAT && ret != SILC_PACKET_RESUME_ROUTER &&
2316       ret != SILC_PACKET_REKEY && ret != SILC_PACKET_REKEY_DONE) {
2317     SILC_LOG_DEBUG(("Connection is disabled"));
2318     goto out;
2319   }
2320
2321   if (ret == SILC_PACKET_NONE) {
2322     SILC_LOG_DEBUG(("Error parsing packet"));
2323     goto out;
2324   }
2325
2326   /* Check that the the current client ID is same as in the client's packet. */
2327   if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
2328     SilcClientEntry client = (SilcClientEntry)sock->user_data;
2329     if (client && client->id && packet->src_id) {
2330       void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
2331                                 packet->src_id_type);
2332       if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
2333         silc_free(id);
2334         SILC_LOG_DEBUG(("Packet source is not same as sender"));
2335         goto out;
2336       }
2337       silc_free(id);
2338     }
2339   }
2340
2341   if (server->server_type == SILC_ROUTER) {
2342     /* Route the packet if it is not destined to us. Other ID types but
2343        server are handled separately after processing them. */
2344     if (packet->dst_id && !(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
2345         packet->dst_id_type == SILC_ID_SERVER &&
2346         sock->type != SILC_SOCKET_TYPE_CLIENT &&
2347         memcmp(packet->dst_id, server->id_string, server->id_string_len)) {
2348
2349       /* Route the packet to fastest route for the destination ID */
2350       void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
2351                                 packet->dst_id_type);
2352       if (!id)
2353         goto out;
2354       silc_server_packet_route(server,
2355                                silc_server_route_get(server, id,
2356                                                      packet->dst_id_type),
2357                                packet);
2358       silc_free(id);
2359       goto out;
2360     }
2361   }
2362
2363   /* Parse the incoming packet type */
2364   silc_server_packet_parse_type(server, sock, packet);
2365
2366   /* Broadcast packet if it is marked as broadcast packet and it is
2367      originated from router and we are router. */
2368   if (server->server_type == SILC_ROUTER &&
2369       sock->type == SILC_SOCKET_TYPE_ROUTER &&
2370       packet->flags & SILC_PACKET_FLAG_BROADCAST) {
2371     /* Broadcast to our primary route */
2372     silc_server_packet_broadcast(server, SILC_PRIMARY_ROUTE(server), packet);
2373
2374     /* If we have backup routers then we need to feed all broadcast
2375        data to those servers. */
2376     silc_server_backup_broadcast(server, sock, packet);
2377   }
2378
2379  out:
2380   silc_packet_context_free(packet);
2381   silc_free(parse_ctx);
2382 }
2383
2384 /* Parser callback called by silc_packet_receive_process. This merely
2385    registers timeout that will handle the actual parsing when appropriate. */
2386
2387 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
2388                               void *context)
2389 {
2390   SilcServer server = (SilcServer)context;
2391   SilcSocketConnection sock = parser_context->sock;
2392   SilcIDListData idata = (SilcIDListData)sock->user_data;
2393   bool ret;
2394
2395   if (idata)
2396     idata->psn_receive = parser_context->packet->sequence + 1;
2397
2398   /* If protocol for this connection is key exchange or rekey then we'll
2399      process all packets synchronously, since there might be packets in
2400      queue that we are not able to decrypt without first processing the
2401      packets before them. */
2402   if ((parser_context->packet->type == SILC_PACKET_REKEY ||
2403        parser_context->packet->type == SILC_PACKET_REKEY_DONE) ||
2404       (sock->protocol && sock->protocol->protocol &&
2405        (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2406         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY))) {
2407     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2408                                   parser_context);
2409
2410     /* Reprocess data since we'll return FALSE here.  This is because
2411        the idata->receive_key might have become valid in the last packet
2412        and we want to call this processor with valid cipher. */
2413     if (idata)
2414       ret = silc_packet_receive_process(
2415                                   sock, server->server_type == SILC_ROUTER ?
2416                                   TRUE : FALSE, idata->receive_key,
2417                                   idata->hmac_receive, idata->psn_receive,
2418                                   silc_server_packet_parse, server);
2419     else
2420       ret = silc_packet_receive_process(
2421                                   sock, server->server_type == SILC_ROUTER ?
2422                                   TRUE : FALSE, NULL, NULL, 0,
2423                                   silc_server_packet_parse, server);
2424
2425     if (!ret) {
2426       /* On packet processing errors we may close our primary router
2427          connection but won't become primary router if we are the backup
2428          since this is local error condition. */
2429       if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2430         server->backup_noswitch = TRUE;
2431
2432       if (sock->user_data)
2433         silc_server_free_sock_user_data(server, sock, NULL);
2434       silc_server_close_connection(server, sock);
2435     }
2436
2437     return FALSE;
2438   }
2439
2440   switch (sock->type) {
2441   case SILC_SOCKET_TYPE_UNKNOWN:
2442   case SILC_SOCKET_TYPE_CLIENT:
2443     /* Parse the packet with timeout */
2444     silc_schedule_task_add(server->schedule, sock->sock,
2445                            silc_server_packet_parse_real,
2446                            (void *)parser_context, 0, 100000,
2447                            SILC_TASK_TIMEOUT,
2448                            SILC_TASK_PRI_NORMAL);
2449     break;
2450   case SILC_SOCKET_TYPE_SERVER:
2451   case SILC_SOCKET_TYPE_ROUTER:
2452     /* Packets from servers are parsed immediately */
2453     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2454                                   parser_context);
2455     break;
2456   default:
2457     return TRUE;
2458   }
2459
2460   return TRUE;
2461 }
2462
2463 /* Parses the packet type and calls what ever routines the packet type
2464    requires. This is done for all incoming packets. */
2465
2466 void silc_server_packet_parse_type(SilcServer server,
2467                                    SilcSocketConnection sock,
2468                                    SilcPacketContext *packet)
2469 {
2470   SilcPacketType type = packet->type;
2471   SilcIDListData idata = (SilcIDListData)sock->user_data;
2472
2473   SILC_LOG_DEBUG(("Received %s packet [flags %d]",
2474                   silc_get_packet_name(type), packet->flags));
2475
2476   /* Parse the packet type */
2477   switch (type) {
2478   case SILC_PACKET_DISCONNECT:
2479     {
2480       SilcStatus status;
2481       char *message = NULL;
2482
2483       if (packet->flags & SILC_PACKET_FLAG_LIST)
2484         break;
2485       if (packet->buffer->len < 1)
2486         break;
2487
2488       status = (SilcStatus)packet->buffer->data[0];
2489       if (packet->buffer->len > 1 &&
2490           silc_utf8_valid(packet->buffer->data + 1, packet->buffer->len - 1))
2491         message = silc_memdup(packet->buffer->data + 1,
2492                               packet->buffer->len - 1);
2493
2494       SILC_LOG_INFO(("Disconnected by %s (%s): %s (%d) %s",
2495                      sock->ip, sock->hostname,
2496                      silc_get_status_message(status), status,
2497                      message ? message : ""));
2498       silc_free(message);
2499
2500       /* Handle the disconnection from our end too */
2501       if (sock->user_data && SILC_IS_LOCAL(sock->user_data))
2502         silc_server_free_sock_user_data(server, sock, NULL);
2503       silc_server_close_connection(server, sock);
2504     }
2505     break;
2506
2507   case SILC_PACKET_SUCCESS:
2508     /*
2509      * Success received for something. For now we can have only
2510      * one protocol for connection executing at once hence this
2511      * success message is for whatever protocol is executing currently.
2512      */
2513     if (packet->flags & SILC_PACKET_FLAG_LIST)
2514       break;
2515     if (sock->protocol)
2516       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2517     break;
2518
2519   case SILC_PACKET_FAILURE:
2520     /*
2521      * Failure received for something. For now we can have only
2522      * one protocol for connection executing at once hence this
2523      * failure message is for whatever protocol is executing currently.
2524      */
2525     if (packet->flags & SILC_PACKET_FLAG_LIST)
2526       break;
2527     if (sock->protocol) {
2528       SilcServerFailureContext f;
2529       f = silc_calloc(1, sizeof(*f));
2530       f->sock = silc_socket_dup(sock);
2531
2532       /* We will wait 5 seconds to process this failure packet */
2533       silc_schedule_task_add(server->schedule, sock->sock,
2534                              silc_server_failure_callback, (void *)f, 5, 0,
2535                              SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2536     }
2537     break;
2538
2539   case SILC_PACKET_REJECT:
2540     if (packet->flags & SILC_PACKET_FLAG_LIST)
2541       break;
2542     return;
2543     break;
2544
2545   case SILC_PACKET_NOTIFY:
2546     /*
2547      * Received notify packet. Server can receive notify packets from
2548      * router. Server then relays the notify messages to clients if needed.
2549      */
2550     if (packet->flags & SILC_PACKET_FLAG_LIST)
2551       silc_server_notify_list(server, sock, packet);
2552     else
2553       silc_server_notify(server, sock, packet);
2554     break;
2555
2556     /*
2557      * Channel packets
2558      */
2559   case SILC_PACKET_CHANNEL_MESSAGE:
2560     /*
2561      * Received channel message. Channel messages are special packets
2562      * (although probably most common ones) thus they are handled
2563      * specially.
2564      */
2565     if (packet->flags & SILC_PACKET_FLAG_LIST)
2566       break;
2567     idata->last_receive = time(NULL);
2568     silc_server_channel_message(server, sock, packet);
2569     break;
2570
2571   case SILC_PACKET_CHANNEL_KEY:
2572     /*
2573      * Received key for channel. As channels are created by the router
2574      * the keys are as well. We will distribute the key to all of our
2575      * locally connected clients on the particular channel. Router
2576      * never receives this channel and thus is ignored.
2577      */
2578     if (packet->flags & SILC_PACKET_FLAG_LIST)
2579       break;
2580     silc_server_channel_key(server, sock, packet);
2581     break;
2582
2583     /*
2584      * Command packets
2585      */
2586   case SILC_PACKET_COMMAND:
2587     /*
2588      * Recived command. Processes the command request and allocates the
2589      * command context and calls the command.
2590      */
2591     if (packet->flags & SILC_PACKET_FLAG_LIST)
2592       break;
2593     silc_server_command_process(server, sock, packet);
2594     break;
2595
2596   case SILC_PACKET_COMMAND_REPLY:
2597     /*
2598      * Received command reply packet. Received command reply to command. It
2599      * may be reply to command sent by us or reply to command sent by client
2600      * that we've routed further.
2601      */
2602     if (packet->flags & SILC_PACKET_FLAG_LIST)
2603       break;
2604     silc_server_command_reply(server, sock, packet);
2605     break;
2606
2607     /*
2608      * Private Message packets
2609      */
2610   case SILC_PACKET_PRIVATE_MESSAGE:
2611     /*
2612      * Received private message packet. The packet is coming from either
2613      * client or server.
2614      */
2615     if (packet->flags & SILC_PACKET_FLAG_LIST)
2616       break;
2617     idata->last_receive = time(NULL);
2618     silc_server_private_message(server, sock, packet);
2619     break;
2620
2621   case SILC_PACKET_PRIVATE_MESSAGE_KEY:
2622     /*
2623      * Private message key packet.
2624      */
2625     if (packet->flags & SILC_PACKET_FLAG_LIST)
2626       break;
2627     silc_server_private_message_key(server, sock, packet);
2628     break;
2629
2630     /*
2631      * Key Exchange protocol packets
2632      */
2633   case SILC_PACKET_KEY_EXCHANGE:
2634     if (packet->flags & SILC_PACKET_FLAG_LIST)
2635       break;
2636
2637     if (sock->protocol && sock->protocol->protocol &&
2638         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
2639       SilcServerKEInternalContext *proto_ctx =
2640         (SilcServerKEInternalContext *)sock->protocol->context;
2641
2642       proto_ctx->packet = silc_packet_context_dup(packet);
2643
2644       /* Let the protocol handle the packet */
2645       silc_protocol_execute(sock->protocol, server->schedule, 0, 100000);
2646     } else {
2647       SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
2648                       "protocol active, packet dropped."));
2649     }
2650     break;
2651
2652   case SILC_PACKET_KEY_EXCHANGE_1:
2653     if (packet->flags & SILC_PACKET_FLAG_LIST)
2654       break;
2655
2656     if (sock->protocol && sock->protocol->protocol &&
2657         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2658          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2659
2660       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2661         SilcServerRekeyInternalContext *proto_ctx =
2662           (SilcServerRekeyInternalContext *)sock->protocol->context;
2663
2664         if (proto_ctx->packet)
2665           silc_packet_context_free(proto_ctx->packet);
2666
2667         proto_ctx->packet = silc_packet_context_dup(packet);
2668
2669         /* Let the protocol handle the packet */
2670         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2671       } else {
2672         SilcServerKEInternalContext *proto_ctx =
2673           (SilcServerKEInternalContext *)sock->protocol->context;
2674
2675         if (proto_ctx->packet)
2676           silc_packet_context_free(proto_ctx->packet);
2677
2678         proto_ctx->packet = silc_packet_context_dup(packet);
2679         proto_ctx->dest_id_type = packet->src_id_type;
2680         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2681                                             packet->src_id_type);
2682         if (!proto_ctx->dest_id)
2683           break;
2684
2685         /* Let the protocol handle the packet */
2686         silc_protocol_execute(sock->protocol, server->schedule,
2687                               0, 100000);
2688       }
2689     } else {
2690       SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
2691                       "protocol active, packet dropped."));
2692     }
2693     break;
2694
2695   case SILC_PACKET_KEY_EXCHANGE_2:
2696     if (packet->flags & SILC_PACKET_FLAG_LIST)
2697       break;
2698
2699     if (sock->protocol && sock->protocol->protocol &&
2700         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2701          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2702
2703       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2704         SilcServerRekeyInternalContext *proto_ctx =
2705           (SilcServerRekeyInternalContext *)sock->protocol->context;
2706
2707         if (proto_ctx->packet)
2708           silc_packet_context_free(proto_ctx->packet);
2709
2710         proto_ctx->packet = silc_packet_context_dup(packet);
2711
2712         /* Let the protocol handle the packet */
2713         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2714       } else {
2715         SilcServerKEInternalContext *proto_ctx =
2716           (SilcServerKEInternalContext *)sock->protocol->context;
2717
2718         if (proto_ctx->packet)
2719           silc_packet_context_free(proto_ctx->packet);
2720
2721         proto_ctx->packet = silc_packet_context_dup(packet);
2722         proto_ctx->dest_id_type = packet->src_id_type;
2723         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2724                                             packet->src_id_type);
2725         if (!proto_ctx->dest_id)
2726           break;
2727
2728         /* Let the protocol handle the packet */
2729         silc_protocol_execute(sock->protocol, server->schedule,
2730                               0, 100000);
2731       }
2732     } else {
2733       SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
2734                       "protocol active, packet dropped."));
2735     }
2736     break;
2737
2738   case SILC_PACKET_CONNECTION_AUTH_REQUEST:
2739     /*
2740      * Connection authentication request packet. When we receive this packet
2741      * we will send to the other end information about our mandatory
2742      * authentication method for the connection. This packet maybe received
2743      * at any time.
2744      */
2745     if (packet->flags & SILC_PACKET_FLAG_LIST)
2746       break;
2747     silc_server_connection_auth_request(server, sock, packet);
2748     break;
2749
2750     /*
2751      * Connection Authentication protocol packets
2752      */
2753   case SILC_PACKET_CONNECTION_AUTH:
2754     /* Start of the authentication protocol. We receive here the
2755        authentication data and will verify it. */
2756     if (packet->flags & SILC_PACKET_FLAG_LIST)
2757       break;
2758
2759     if (sock->protocol && sock->protocol->protocol->type
2760         == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
2761
2762       SilcServerConnAuthInternalContext *proto_ctx =
2763         (SilcServerConnAuthInternalContext *)sock->protocol->context;
2764
2765       proto_ctx->packet = silc_packet_context_dup(packet);
2766
2767       /* Let the protocol handle the packet */
2768       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2769     } else {
2770       SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
2771                       "protocol active, packet dropped."));
2772     }
2773     break;
2774
2775   case SILC_PACKET_NEW_ID:
2776     /*
2777      * Received New ID packet. This includes some new ID that has been
2778      * created. It may be for client, server or channel. This is the way
2779      * to distribute information about new registered entities in the
2780      * SILC network.
2781      */
2782     if (packet->flags & SILC_PACKET_FLAG_LIST)
2783       silc_server_new_id_list(server, sock, packet);
2784     else
2785       silc_server_new_id(server, sock, packet);
2786     break;
2787
2788   case SILC_PACKET_NEW_CLIENT:
2789     /*
2790      * Received new client packet. This includes client information that
2791      * we will use to create initial client ID. After creating new
2792      * ID we will send it to the client.
2793      */
2794     if (packet->flags & SILC_PACKET_FLAG_LIST)
2795       break;
2796     silc_server_new_client(server, sock, packet);
2797     break;
2798
2799   case SILC_PACKET_NEW_SERVER:
2800     /*
2801      * Received new server packet. This includes Server ID and some other
2802      * information that we may save. This is received after server has
2803      * connected to us.
2804      */
2805     if (packet->flags & SILC_PACKET_FLAG_LIST)
2806       break;
2807     silc_server_new_server(server, sock, packet);
2808     break;
2809
2810   case SILC_PACKET_NEW_CHANNEL:
2811     /*
2812      * Received new channel packet. Information about new channel in the
2813      * network are distributed using this packet.
2814      */
2815     if (packet->flags & SILC_PACKET_FLAG_LIST)
2816       silc_server_new_channel_list(server, sock, packet);
2817     else
2818       silc_server_new_channel(server, sock, packet);
2819     break;
2820
2821   case SILC_PACKET_HEARTBEAT:
2822     /*
2823      * Received heartbeat.
2824      */
2825     if (packet->flags & SILC_PACKET_FLAG_LIST)
2826       break;
2827     break;
2828
2829   case SILC_PACKET_KEY_AGREEMENT:
2830     /*
2831      * Received heartbeat.
2832      */
2833     if (packet->flags & SILC_PACKET_FLAG_LIST)
2834       break;
2835     silc_server_key_agreement(server, sock, packet);
2836     break;
2837
2838   case SILC_PACKET_REKEY:
2839     /*
2840      * Received re-key packet. The sender wants to regenerate the session
2841      * keys.
2842      */
2843     if (packet->flags & SILC_PACKET_FLAG_LIST)
2844       break;
2845     silc_server_rekey(server, sock, packet);
2846     break;
2847
2848   case SILC_PACKET_REKEY_DONE:
2849     /*
2850      * The re-key is done.
2851      */
2852     if (packet->flags & SILC_PACKET_FLAG_LIST)
2853       break;
2854
2855     if (sock->protocol && sock->protocol->protocol &&
2856         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2857
2858       SilcServerRekeyInternalContext *proto_ctx =
2859         (SilcServerRekeyInternalContext *)sock->protocol->context;
2860
2861       if (proto_ctx->packet)
2862         silc_packet_context_free(proto_ctx->packet);
2863
2864       proto_ctx->packet = silc_packet_context_dup(packet);
2865
2866       /* Let the protocol handle the packet */
2867       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2868     } else {
2869       SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2870                       "protocol active, packet dropped."));
2871     }
2872     break;
2873
2874   case SILC_PACKET_FTP:
2875     /* FTP packet */
2876     if (packet->flags & SILC_PACKET_FLAG_LIST)
2877       break;
2878     silc_server_ftp(server, sock, packet);
2879     break;
2880
2881   case SILC_PACKET_RESUME_CLIENT:
2882     /* Resume client */
2883     if (packet->flags & SILC_PACKET_FLAG_LIST)
2884       break;
2885     silc_server_resume_client(server, sock, packet);
2886     break;
2887
2888   case SILC_PACKET_RESUME_ROUTER:
2889     /* Resume router packet received. This packet is received for backup
2890        router resuming protocol. */
2891     if (packet->flags & SILC_PACKET_FLAG_LIST)
2892       break;
2893     silc_server_backup_resume_router(server, sock, packet);
2894     break;
2895
2896   default:
2897     SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2898     break;
2899   }
2900 }
2901
2902 /* Creates connection to a remote router. */
2903
2904 void silc_server_create_connection(SilcServer server,
2905                                    const char *remote_host, SilcUInt32 port)
2906 {
2907   SilcServerConnection sconn;
2908
2909   /* Allocate connection object for hold connection specific stuff. */
2910   sconn = silc_calloc(1, sizeof(*sconn));
2911   sconn->remote_host = strdup(remote_host);
2912   sconn->remote_port = port;
2913   sconn->no_reconnect = TRUE;
2914
2915   silc_schedule_task_add(server->schedule, 0,
2916                          silc_server_connect_router,
2917                          (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2918                          SILC_TASK_PRI_NORMAL);
2919 }
2920
2921 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2922 {
2923   silc_socket_free(context);
2924 }
2925
2926 /* Closes connection to socket connection */
2927
2928 void silc_server_close_connection(SilcServer server,
2929                                   SilcSocketConnection sock)
2930 {
2931   char tmp[128];
2932
2933   if (!server->sockets[sock->sock] && SILC_IS_DISCONNECTED(sock)) {
2934     silc_schedule_task_add(server->schedule, 0,
2935                            silc_server_close_connection_final,
2936                            (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2937                            SILC_TASK_PRI_NORMAL);
2938     return;
2939   }
2940
2941   memset(tmp, 0, sizeof(tmp));
2942   silc_socket_get_error(sock, tmp, sizeof(tmp));
2943   SILC_LOG_INFO(("Closing connection %s:%d [%s] %s", sock->hostname,
2944                   sock->port,
2945                   (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2946                    sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2947                    sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2948                    "Router"), tmp[0] ? tmp : ""));
2949
2950   /* We won't listen for this connection anymore */
2951   silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2952
2953   /* Unregister all tasks */
2954   silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2955
2956   /* Close the actual connection */
2957   silc_net_close_connection(sock->sock);
2958   server->sockets[sock->sock] = NULL;
2959
2960   /* If sock->user_data is NULL then we'll check for active protocols
2961      here since the silc_server_free_sock_user_data has not been called
2962      for this connection. */
2963   if (!sock->user_data) {
2964     /* If any protocol is active cancel its execution. It will call
2965        the final callback which will finalize the disconnection. */
2966     if (sock->protocol) {
2967       SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
2968       silc_protocol_cancel(sock->protocol, server->schedule);
2969       sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2970       silc_protocol_execute_final(sock->protocol, server->schedule);
2971       sock->protocol = NULL;
2972       return;
2973     }
2974   }
2975
2976   silc_schedule_task_add(server->schedule, 0,
2977                          silc_server_close_connection_final,
2978                          (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2979                          SILC_TASK_PRI_NORMAL);
2980 }
2981
2982 /* Sends disconnect message to remote connection and disconnects the
2983    connection. */
2984
2985 void silc_server_disconnect_remote(SilcServer server,
2986                                    SilcSocketConnection sock,
2987                                    SilcStatus status, ...)
2988 {
2989   va_list ap;
2990   unsigned char buf[512];
2991   SilcBuffer buffer;
2992   char *cp;
2993   int len;
2994
2995   if (!sock || SILC_IS_DISCONNECTED(sock))
2996     return;
2997
2998   memset(buf, 0, sizeof(buf));
2999   va_start(ap, status);
3000   cp = va_arg(ap, char *);
3001   if (cp) {
3002     vsnprintf(buf, sizeof(buf) - 1, cp, ap);
3003     cp = buf;
3004   }
3005   va_end(ap);
3006
3007   SILC_LOG_DEBUG(("Disconnecting remote host"));
3008
3009   /* Notify remote end that the conversation is over. The notify message
3010      is tried to be sent immediately. */
3011
3012   len = 1;
3013   if (cp)
3014     len += silc_utf8_encoded_len(buf, strlen(buf), SILC_STRING_ASCII);
3015
3016   buffer = silc_buffer_alloc_size(len);
3017   if (!buffer)
3018     goto out;
3019
3020   buffer->data[0] = status;
3021   if (cp)
3022     silc_utf8_encode(buf, strlen(buf), SILC_STRING_ASCII, buffer->data + 1,
3023                      buffer->len - 1);
3024   silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
3025                           buffer->data, buffer->len, TRUE);
3026   silc_buffer_free(buffer);
3027
3028  out:
3029   silc_server_packet_queue_purge(server, sock);
3030
3031   /* Mark the connection to be disconnected */
3032   SILC_SET_DISCONNECTED(sock);
3033   silc_server_close_connection(server, sock);
3034 }
3035
3036 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
3037 {
3038   SilcServer server = app_context;
3039   SilcClientEntry client = context;
3040
3041   assert(!silc_hash_table_count(client->channels));
3042
3043   silc_idlist_del_data(client);
3044   silc_idcache_purge_by_context(server->local_list->clients, client);
3045 }
3046
3047 /* Frees client data and notifies about client's signoff. */
3048
3049 void silc_server_free_client_data(SilcServer server,
3050                                   SilcSocketConnection sock,
3051                                   SilcClientEntry client,
3052                                   int notify,
3053                                   const char *signoff)
3054 {
3055   SILC_LOG_DEBUG(("Freeing client data"));
3056
3057   /* If there is pending outgoing data for the client then purge it
3058      to the network before removing the client entry. */
3059   silc_server_packet_queue_purge(server, sock);
3060
3061   if (client->id) {
3062     /* Check if anyone is watching this nickname */
3063     if (server->server_type == SILC_ROUTER)
3064       silc_server_check_watcher_list(server, client, NULL,
3065                                      SILC_NOTIFY_TYPE_SIGNOFF);
3066
3067     /* Send SIGNOFF notify to routers. */
3068     if (notify)
3069       silc_server_send_notify_signoff(server, SILC_PRIMARY_ROUTE(server),
3070                                       SILC_BROADCAST(server), client->id,
3071                                       signoff);
3072   }
3073
3074   /* Remove client from all channels */
3075   if (notify)
3076     silc_server_remove_from_channels(server, NULL, client,
3077                                      TRUE, (char *)signoff, TRUE);
3078   else
3079     silc_server_remove_from_channels(server, NULL, client,
3080                                      FALSE, NULL, FALSE);
3081
3082   /* Remove this client from watcher list if it is */
3083   silc_server_del_from_watcher_list(server, client);
3084
3085   /* Update statistics */
3086   server->stat.my_clients--;
3087   server->stat.clients--;
3088   if (server->stat.cell_clients)
3089     server->stat.cell_clients--;
3090   SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
3091   SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
3092   silc_schedule_task_del_by_context(server->schedule, client);
3093
3094   /* We will not delete the client entry right away. We will take it
3095      into history (for WHOWAS command) for 5 minutes, unless we're
3096      shutting down server. */
3097   if (!server->server_shutdown) {
3098     silc_schedule_task_add(server->schedule, 0,
3099                            silc_server_free_client_data_timeout,
3100                            client, 300, 0,
3101                            SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
3102     client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
3103     client->data.status &= ~SILC_IDLIST_STATUS_LOCAL;
3104     client->mode = 0;
3105     client->router = NULL;
3106     client->connection = NULL;
3107   } else {
3108     /* Delete directly since we're shutting down server */
3109     silc_idlist_del_data(client);
3110     silc_idlist_del_client(server->local_list, client);
3111   }
3112 }
3113
3114 /* Frees user_data pointer from socket connection object. This also sends
3115    appropriate notify packets to the network to inform about leaving
3116    entities. */
3117
3118 void silc_server_free_sock_user_data(SilcServer server,
3119                                      SilcSocketConnection sock,
3120                                      const char *signoff_message)
3121 {
3122   switch (sock->type) {
3123   case SILC_SOCKET_TYPE_CLIENT:
3124     {
3125       SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
3126       silc_server_free_client_data(server, sock, user_data, TRUE,
3127                                    signoff_message);
3128       break;
3129     }
3130   case SILC_SOCKET_TYPE_SERVER:
3131   case SILC_SOCKET_TYPE_ROUTER:
3132     {
3133       SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
3134       SilcServerEntry backup_router = NULL;
3135
3136       SILC_LOG_DEBUG(("Freeing server data"));
3137
3138       if (user_data->id)
3139         backup_router = silc_server_backup_get(server, user_data->id);
3140
3141       if (!server->backup_router && server->server_type == SILC_ROUTER &&
3142           backup_router == server->id_entry &&
3143           sock->type != SILC_SOCKET_TYPE_ROUTER)
3144         backup_router = NULL;
3145
3146       if (server->server_shutdown || server->backup_noswitch)
3147         backup_router = NULL;
3148
3149       /* If this was our primary router connection then we're lost to
3150          the outside world. */
3151       if (server->router == user_data) {
3152         /* Check whether we have a backup router connection */
3153         if (!backup_router || backup_router == user_data) {
3154           silc_schedule_task_add(server->schedule, 0,
3155                                  silc_server_connect_to_router,
3156                                  server, 1, 0,
3157                                  SILC_TASK_TIMEOUT,
3158                                  SILC_TASK_PRI_NORMAL);
3159
3160           server->id_entry->router = NULL;
3161           server->router = NULL;
3162           server->standalone = TRUE;
3163           backup_router = NULL;
3164         } else {
3165           if (server->id_entry != backup_router) {
3166             SILC_LOG_INFO(("New primary router is backup router %s",
3167                            backup_router->server_name));
3168             server->id_entry->router = backup_router;
3169             server->router = backup_router;
3170             server->router_connect = time(0);
3171             server->backup_primary = TRUE;
3172           } else {
3173             SILC_LOG_INFO(("We are now new primary router in this cell"));
3174             server->id_entry->router = NULL;
3175             server->router = NULL;
3176             server->standalone = TRUE;
3177
3178             /* We stop here to take a breath */
3179             sleep(2);
3180           }
3181
3182           if (server->server_type == SILC_BACKUP_ROUTER) {
3183             server->server_type = SILC_ROUTER;
3184
3185             /* We'll need to constantly try to reconnect to the primary
3186                router so that we'll see when it comes back online. */
3187             silc_server_backup_reconnect(server, sock->ip, sock->port,
3188                                          silc_server_backup_connected,
3189                                          NULL);
3190           }
3191
3192           /* Mark this connection as replaced */
3193           silc_server_backup_replaced_add(server, user_data->id,
3194                                           backup_router);
3195         }
3196       } else if (backup_router) {
3197         SILC_LOG_INFO(("Enabling the use of backup router %s",
3198                        backup_router->server_name));
3199         SILC_LOG_DEBUG(("Enabling the use of backup router %s",
3200                         backup_router->server_name));
3201
3202         /* Mark this connection as replaced */
3203         silc_server_backup_replaced_add(server, user_data->id,
3204                                         backup_router);
3205       } else if (server->server_type == SILC_SERVER &&
3206                  sock->type == SILC_SOCKET_TYPE_ROUTER) {
3207         /* Reconnect to the router (backup) */
3208         silc_schedule_task_add(server->schedule, 0,
3209                                silc_server_connect_to_router,
3210                                server, 1, 0,
3211                                SILC_TASK_TIMEOUT,
3212                                SILC_TASK_PRI_NORMAL);
3213       }
3214
3215       if (!backup_router) {
3216         /* Remove all servers that are originated from this server, and
3217            remove the clients of those servers too. */
3218         silc_server_remove_servers_by_server(server, user_data, TRUE);
3219
3220         /* Remove the clients that this server owns as they will become
3221            invalid now too.  For backup router the server is actually
3222            coming from the primary router, so mark that as the owner
3223            of this entry. */
3224         if (server->server_type == SILC_BACKUP_ROUTER &&
3225             sock->type == SILC_SOCKET_TYPE_SERVER)
3226           silc_server_remove_clients_by_server(server, server->router,
3227                                                user_data, TRUE);
3228         else
3229           silc_server_remove_clients_by_server(server, user_data,
3230                                                user_data, TRUE);
3231
3232         /* Remove channels owned by this server */
3233         if (server->server_type == SILC_SERVER)
3234           silc_server_remove_channels_by_server(server, user_data);
3235       } else {
3236         /* Enable local server connections that may be disabled */
3237         silc_server_local_servers_toggle_enabled(server, TRUE);
3238
3239         /* Update the client entries of this server to the new backup
3240            router.  If we are the backup router we also resolve the real
3241            servers for the clients.  After updating is over this also
3242            removes the clients that this server explicitly owns. */
3243         silc_server_update_clients_by_server(server, user_data,
3244                                              backup_router, TRUE);
3245
3246         /* If we are router and just lost our primary router (now standlaone)
3247            we remove everything that was behind it, since we don't know
3248            any better. */
3249         if (server->server_type == SILC_ROUTER && server->standalone)
3250           /* Remove all servers that are originated from this server, and
3251              remove the clients of those servers too. */
3252           silc_server_remove_servers_by_server(server, user_data, TRUE);
3253
3254         /* Finally remove the clients that are explicitly owned by this
3255            server.  They go down with the server. */
3256         silc_server_remove_clients_by_server(server, user_data,
3257                                              user_data, TRUE);
3258
3259         /* Update our server cache to use the new backup router too. */
3260         silc_server_update_servers_by_server(server, user_data, backup_router);
3261         if (server->server_type == SILC_SERVER)
3262           silc_server_update_channels_by_server(server, user_data,
3263                                                 backup_router);
3264
3265         /* Send notify about primary router going down to local operators */
3266         if (server->backup_router)
3267           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3268                                  SILC_NOTIFY_TYPE_NONE,
3269                                  ("%s switched to backup router %s "
3270                                   "(we are primary router now)",
3271                                   server->server_name, server->server_name));
3272         else if (server->router)
3273           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3274                                  SILC_NOTIFY_TYPE_NONE,
3275                                  ("%s switched to backup router %s",
3276                                   server->server_name,
3277                                   server->router->server_name));
3278       }
3279       server->backup_noswitch = FALSE;
3280
3281       /* Free the server entry */
3282       silc_server_backup_del(server, user_data);
3283       silc_server_backup_replaced_del(server, user_data);
3284       silc_idlist_del_data(user_data);
3285       if (!silc_idlist_del_server(server->local_list, user_data))
3286         silc_idlist_del_server(server->global_list, user_data);
3287       if (sock->type == SILC_SOCKET_TYPE_SERVER) {
3288         server->stat.my_servers--;
3289       } else {
3290         server->stat.my_routers--;
3291         server->stat.routers--;
3292       }
3293       server->stat.servers--;
3294       if (server->server_type == SILC_ROUTER)
3295         server->stat.cell_servers--;
3296
3297       if (backup_router && backup_router != server->id_entry) {
3298         /* Announce all of our stuff that was created about 5 minutes ago.
3299            The backup router knows all the other stuff already. */
3300         if (server->server_type == SILC_ROUTER)
3301           silc_server_announce_servers(server, FALSE, time(0) - 300,
3302                                        backup_router->connection);
3303
3304         /* Announce our clients and channels to the router */
3305         silc_server_announce_clients(server, time(0) - 300,
3306                                      backup_router->connection);
3307         silc_server_announce_channels(server, time(0) - 300,
3308                                       backup_router->connection);
3309       }
3310       break;
3311     }
3312   default:
3313     {
3314       SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
3315
3316       SILC_LOG_DEBUG(("Freeing unknown connection data"));
3317
3318       silc_idlist_del_data(user_data);
3319       silc_free(user_data);
3320       break;
3321     }
3322   }
3323
3324   /* If any protocol is active cancel its execution */
3325   if (sock->protocol) {
3326     SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
3327     silc_protocol_cancel(sock->protocol, server->schedule);
3328     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3329     silc_protocol_execute_final(sock->protocol, server->schedule);
3330     sock->protocol = NULL;
3331   }
3332
3333   sock->user_data = NULL;
3334 }
3335
3336 /* Removes client from all channels it has joined. This is used when client
3337    connection is disconnected. If the client on a channel is last, the
3338    channel is removed as well. This sends the SIGNOFF notify types. */
3339
3340 void silc_server_remove_from_channels(SilcServer server,
3341                                       SilcSocketConnection sock,
3342                                       SilcClientEntry client,
3343                                       bool notify,
3344                                       const char *signoff_message,
3345                                       bool keygen)
3346 {
3347   SilcChannelEntry channel;
3348   SilcChannelClientEntry chl;
3349   SilcHashTableList htl;
3350   SilcBuffer clidp = NULL;
3351
3352   if (!client)
3353     return;
3354
3355   SILC_LOG_DEBUG(("Removing client from joined channels"));
3356
3357   if (notify && !client->id)
3358     notify = FALSE;
3359
3360   if (notify) {
3361     clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3362     if (!clidp)
3363       notify = FALSE;
3364   }
3365
3366   /* Remove the client from all channels. The client is removed from
3367      the channels' user list. */
3368   silc_hash_table_list(client->channels, &htl);
3369   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3370     channel = chl->channel;
3371
3372     /* Remove channel if this is last client leaving the channel, unless
3373        the channel is permanent. */
3374     if (server->server_type != SILC_SERVER &&
3375         silc_hash_table_count(channel->user_list) < 2) {
3376       silc_server_channel_delete(server, channel);
3377       continue;
3378     }
3379
3380     silc_hash_table_del(client->channels, channel);
3381     silc_hash_table_del(channel->user_list, client);
3382     channel->user_count--;
3383
3384     /* If there is no global users on the channel anymore mark the channel
3385        as local channel. Do not check if the removed client is local client. */
3386     if (server->server_type == SILC_SERVER && channel->global_users &&
3387         chl->client->router && !silc_server_channel_has_global(channel))
3388       channel->global_users = FALSE;
3389
3390     memset(chl, 'A', sizeof(*chl));
3391     silc_free(chl);
3392
3393     /* Update statistics */
3394     if (SILC_IS_LOCAL(client))
3395       server->stat.my_chanclients--;
3396     if (server->server_type == SILC_ROUTER) {
3397       server->stat.cell_chanclients--;
3398       server->stat.chanclients--;
3399     }
3400
3401     /* If there is not at least one local user on the channel then we don't
3402        need the channel entry anymore, we can remove it safely, unless the
3403        channel is permanent channel */
3404     if (server->server_type == SILC_SERVER &&
3405         !silc_server_channel_has_local(channel)) {
3406       /* Notify about leaving client if this channel has global users. */
3407       if (notify && channel->global_users)
3408         silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3409                                            SILC_NOTIFY_TYPE_SIGNOFF,
3410                                            signoff_message ? 2 : 1,
3411                                            clidp->data, clidp->len,
3412                                            signoff_message, signoff_message ?
3413                                            strlen(signoff_message) : 0);
3414
3415       silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3416       silc_server_channel_delete(server, channel);
3417       continue;
3418     }
3419
3420     /* Send notify to channel about client leaving SILC and channel too */
3421     if (notify)
3422       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3423                                          SILC_NOTIFY_TYPE_SIGNOFF,
3424                                          signoff_message ? 2 : 1,
3425                                          clidp->data, clidp->len,
3426                                          signoff_message, signoff_message ?
3427                                          strlen(signoff_message) : 0);
3428
3429     /* Don't create keys if we are shutting down */
3430     if (server->server_shutdown)
3431       continue;
3432
3433     /* Re-generate channel key if needed */
3434     if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
3435       if (!silc_server_create_channel_key(server, channel, 0))
3436         continue;
3437
3438       /* Send the channel key to the channel. The key of course is not sent
3439          to the client who was removed from the channel. */
3440       silc_server_send_channel_key(server, client->connection, channel,
3441                                    server->server_type == SILC_ROUTER ?
3442                                    FALSE : !server->standalone);
3443     }
3444   }
3445
3446   silc_hash_table_list_reset(&htl);
3447   if (clidp)
3448     silc_buffer_free(clidp);
3449 }
3450
3451 /* Removes client from one channel. This is used for example when client
3452    calls LEAVE command to remove itself from the channel. Returns TRUE
3453    if channel still exists and FALSE if the channel is removed when
3454    last client leaves the channel. If `notify' is FALSE notify messages
3455    are not sent. */
3456
3457 bool silc_server_remove_from_one_channel(SilcServer server,
3458                                          SilcSocketConnection sock,
3459                                          SilcChannelEntry channel,
3460                                          SilcClientEntry client,
3461                                          bool notify)
3462 {
3463   SilcChannelClientEntry chl;
3464   SilcBuffer clidp;
3465
3466   SILC_LOG_DEBUG(("Removing %s from channel %s",
3467                   silc_id_render(client->id, SILC_ID_CLIENT),
3468                   channel->channel_name));
3469
3470   /* Get the entry to the channel, if this client is not on the channel
3471      then return Ok. */
3472   if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
3473     return TRUE;
3474
3475   /* Remove channel if this is last client leaving the channel, unless
3476      the channel is permanent. */
3477   if (server->server_type != SILC_SERVER &&
3478       silc_hash_table_count(channel->user_list) < 2) {
3479     silc_server_channel_delete(server, channel);
3480     return FALSE;
3481   }
3482
3483   silc_hash_table_del(client->channels, channel);
3484   silc_hash_table_del(channel->user_list, client);
3485   channel->user_count--;
3486
3487   /* If there is no global users on the channel anymore mark the channel
3488      as local channel. Do not check if the client is local client. */
3489   if (server->server_type == SILC_SERVER && channel->global_users &&
3490       chl->client->router && !silc_server_channel_has_global(channel))
3491     channel->global_users = FALSE;
3492
3493   memset(chl, 'O', sizeof(*chl));
3494   silc_free(chl);
3495
3496   /* Update statistics */
3497   if (SILC_IS_LOCAL(client))
3498     server->stat.my_chanclients--;
3499   if (server->server_type == SILC_ROUTER) {
3500     server->stat.cell_chanclients--;
3501     server->stat.chanclients--;
3502   }
3503
3504   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3505   if (!clidp)
3506     notify = FALSE;
3507
3508   /* If there is not at least one local user on the channel then we don't
3509      need the channel entry anymore, we can remove it safely, unless the
3510      channel is permanent channel */
3511   if (server->server_type == SILC_SERVER &&
3512       !silc_server_channel_has_local(channel)) {
3513     /* Notify about leaving client if this channel has global users. */
3514     if (notify && channel->global_users)
3515       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3516                                          SILC_NOTIFY_TYPE_LEAVE, 1,
3517                                          clidp->data, clidp->len);
3518
3519     silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3520     silc_server_channel_delete(server, channel);
3521     silc_buffer_free(clidp);
3522     return FALSE;
3523   }
3524
3525   /* Send notify to channel about client leaving the channel */
3526   if (notify)
3527     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3528                                        SILC_NOTIFY_TYPE_LEAVE, 1,
3529                                        clidp->data, clidp->len);
3530
3531   silc_buffer_free(clidp);
3532   return TRUE;
3533 }
3534
3535 /* Timeout callback. This is called if connection is idle or for some
3536    other reason is not responding within some period of time. This
3537    disconnects the remote end. */
3538
3539 SILC_TASK_CALLBACK(silc_server_timeout_remote)
3540 {
3541   SilcServer server = (SilcServer)context;
3542   SilcSocketConnection sock = server->sockets[fd];
3543   SilcProtocolType protocol = 0;
3544
3545   SILC_LOG_DEBUG(("Start"));
3546
3547   if (!sock)
3548     return;
3549
3550   SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
3551                   sock->hostname, sock->ip));
3552
3553   /* If we have protocol active we must assure that we call the protocol's
3554      final callback so that all the memory is freed. */
3555   if (sock->protocol) {
3556     protocol = sock->protocol->protocol->type;
3557     silc_protocol_cancel(sock->protocol, server->schedule);
3558     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3559     silc_protocol_execute_final(sock->protocol, server->schedule);
3560     sock->protocol = NULL;
3561     return;
3562   }
3563
3564   silc_server_disconnect_remote(server, sock,
3565                                 protocol ==
3566                                 SILC_PROTOCOL_SERVER_CONNECTION_AUTH ?
3567                                 SILC_STATUS_ERR_AUTH_FAILED :
3568                                 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
3569                                 "Connection timeout");
3570
3571   if (sock->user_data)
3572     silc_server_free_sock_user_data(server, sock, NULL);
3573 }
3574
3575 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
3576    function may be used only by router. In real SILC network all channels
3577    are created by routers thus this function is never used by normal
3578    server. */
3579
3580 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
3581                                                 SilcServerID *router_id,
3582                                                 char *cipher,
3583                                                 char *hmac,
3584                                                 char *channel_name,
3585                                                 int broadcast)
3586 {
3587   SilcChannelID *channel_id;
3588   SilcChannelEntry entry;
3589   SilcCipher key;
3590   SilcHmac newhmac;
3591
3592   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3593
3594   if (!cipher)
3595     cipher = SILC_DEFAULT_CIPHER;
3596   if (!hmac)
3597     hmac = SILC_DEFAULT_HMAC;
3598
3599   /* Allocate cipher */
3600   if (!silc_cipher_alloc(cipher, &key))
3601     return NULL;
3602
3603   /* Allocate hmac */
3604   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3605     silc_cipher_free(key);
3606     return NULL;
3607   }
3608
3609   channel_name = strdup(channel_name);
3610
3611   /* Create the channel ID */
3612   if (!silc_id_create_channel_id(server, router_id, server->rng,
3613                                  &channel_id)) {
3614     silc_free(channel_name);
3615     silc_cipher_free(key);
3616     silc_hmac_free(newhmac);
3617     return NULL;
3618   }
3619
3620   /* Create the channel */
3621   entry = silc_idlist_add_channel(server->local_list, channel_name,
3622                                   SILC_CHANNEL_MODE_NONE, channel_id,
3623                                   NULL, key, newhmac, 0);
3624   if (!entry) {
3625     silc_free(channel_name);
3626     silc_cipher_free(key);
3627     silc_hmac_free(newhmac);
3628     silc_free(channel_id);
3629     return NULL;
3630   }
3631
3632   entry->cipher = strdup(cipher);
3633   entry->hmac_name = strdup(hmac);
3634
3635   /* Now create the actual key material */
3636   if (!silc_server_create_channel_key(server, entry,
3637                                       silc_cipher_get_key_len(key) / 8)) {
3638     silc_idlist_del_channel(server->local_list, entry);
3639     return NULL;
3640   }
3641
3642   /* Notify other routers about the new channel. We send the packet
3643      to our primary route. */
3644   if (broadcast)
3645     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3646                                  channel_name, entry->id,
3647                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3648                                  entry->mode);
3649
3650   /* Distribute to backup routers */
3651   if (broadcast && server->server_type == SILC_ROUTER) {
3652     SilcBuffer packet;
3653     unsigned char *cid;
3654     SilcUInt32 name_len = strlen(channel_name);
3655     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3656     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3657
3658     packet = silc_channel_payload_encode(channel_name, name_len,
3659                                          cid, channel_id_len, entry->mode);
3660     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3661                             packet->data, packet->len, FALSE, TRUE);
3662     silc_free(cid);
3663     silc_buffer_free(packet);
3664   }
3665
3666   server->stat.my_channels++;
3667   if (server->server_type == SILC_ROUTER) {
3668     server->stat.channels++;
3669     server->stat.cell_channels++;
3670     entry->users_resolved = TRUE;
3671   }
3672
3673   return entry;
3674 }
3675
3676 /* Same as above but creates the channel with Channel ID `channel_id. */
3677
3678 SilcChannelEntry
3679 silc_server_create_new_channel_with_id(SilcServer server,
3680                                        char *cipher,
3681                                        char *hmac,
3682                                        char *channel_name,
3683                                        SilcChannelID *channel_id,
3684                                        int broadcast)
3685 {
3686   SilcChannelEntry entry;
3687   SilcCipher key;
3688   SilcHmac newhmac;
3689
3690   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3691
3692   if (!cipher)
3693     cipher = SILC_DEFAULT_CIPHER;
3694   if (!hmac)
3695     hmac = SILC_DEFAULT_HMAC;
3696
3697   /* Allocate cipher */
3698   if (!silc_cipher_alloc(cipher, &key))
3699     return NULL;
3700
3701   /* Allocate hmac */
3702   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3703     silc_cipher_free(key);
3704     return NULL;
3705   }
3706
3707   channel_name = strdup(channel_name);
3708
3709   /* Create the channel */
3710   entry = silc_idlist_add_channel(server->local_list, channel_name,
3711                                   SILC_CHANNEL_MODE_NONE, channel_id,
3712                                   NULL, key, newhmac, 0);
3713   if (!entry) {
3714     silc_cipher_free(key);
3715     silc_hmac_free(newhmac);
3716     silc_free(channel_name);
3717     return NULL;
3718   }
3719
3720   /* Now create the actual key material */
3721   if (!silc_server_create_channel_key(server, entry,
3722                                       silc_cipher_get_key_len(key) / 8)) {
3723     silc_idlist_del_channel(server->local_list, entry);
3724     return NULL;
3725   }
3726
3727   /* Notify other routers about the new channel. We send the packet
3728      to our primary route. */
3729   if (broadcast)
3730     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3731                                  channel_name, entry->id,
3732                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3733                                  entry->mode);
3734
3735   /* Distribute to backup routers */
3736   if (broadcast && server->server_type == SILC_ROUTER) {
3737     SilcBuffer packet;
3738     unsigned char *cid;
3739     SilcUInt32 name_len = strlen(channel_name);
3740     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3741     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3742
3743     packet = silc_channel_payload_encode(channel_name, name_len,
3744                                          cid, channel_id_len, entry->mode);
3745     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3746                             packet->data, packet->len, FALSE, TRUE);
3747     silc_free(cid);
3748     silc_buffer_free(packet);
3749   }
3750
3751   server->stat.my_channels++;
3752   if (server->server_type == SILC_ROUTER) {
3753     server->stat.channels++;
3754     server->stat.cell_channels++;
3755     entry->users_resolved = TRUE;
3756   }
3757
3758   return entry;
3759 }
3760
3761 /* Channel's key re-key timeout callback. */
3762
3763 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3764 {
3765   SilcServer server = app_context;
3766   SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3767
3768   rekey->task = NULL;
3769
3770   /* Return now if we are shutting down */
3771   if (server->server_shutdown)
3772     return;
3773
3774   if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3775     return;
3776
3777   silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3778 }
3779
3780 /* Generates new channel key. This is used to create the initial channel key
3781    but also to re-generate new key for channel. If `key_len' is provided
3782    it is the bytes of the key length. */
3783
3784 bool silc_server_create_channel_key(SilcServer server,
3785                                     SilcChannelEntry channel,
3786                                     SilcUInt32 key_len)
3787 {
3788   int i;
3789   unsigned char channel_key[32], hash[32];
3790   SilcUInt32 len;
3791
3792   if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3793     SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3794     return TRUE;
3795   }
3796
3797   SILC_LOG_DEBUG(("Generating channel %s key", channel->channel_name));
3798
3799   if (!channel->channel_key)
3800     if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3801       channel->channel_key = NULL;
3802       return FALSE;
3803     }
3804
3805   if (key_len)
3806     len = key_len;
3807   else if (channel->key_len)
3808     len = channel->key_len / 8;
3809   else
3810     len = silc_cipher_get_key_len(channel->channel_key) / 8;
3811
3812   /* Create channel key */
3813   for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3814
3815   /* Set the key */
3816   silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3817
3818   /* Remove old key if exists */
3819   if (channel->key) {
3820     memset(channel->key, 0, channel->key_len / 8);
3821     silc_free(channel->key);
3822   }
3823
3824   /* Save the key */
3825   channel->key_len = len * 8;
3826   channel->key = silc_memdup(channel_key, len);
3827   memset(channel_key, 0, sizeof(channel_key));
3828
3829   /* Generate HMAC key from the channel key data and set it */
3830   if (!channel->hmac)
3831     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3832   silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3833   silc_hmac_set_key(channel->hmac, hash,
3834                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3835   memset(hash, 0, sizeof(hash));
3836
3837   if (server->server_type == SILC_ROUTER) {
3838     if (!channel->rekey)
3839       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3840     channel->rekey->channel = channel;
3841     channel->rekey->key_len = key_len;
3842     if (channel->rekey->task)
3843       silc_schedule_task_del(server->schedule, channel->rekey->task);
3844
3845     channel->rekey->task =
3846       silc_schedule_task_add(server->schedule, 0,
3847                              silc_server_channel_key_rekey,
3848                              (void *)channel->rekey,
3849                              server->config->channel_rekey_secs, 0,
3850                              SILC_TASK_TIMEOUT,
3851                              SILC_TASK_PRI_NORMAL);
3852   }
3853
3854   return TRUE;
3855 }
3856
3857 /* Saves the channel key found in the encoded `key_payload' buffer. This
3858    function is used when we receive Channel Key Payload and also when we're
3859    processing JOIN command reply. Returns entry to the channel. */
3860
3861 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3862                                               SilcBuffer key_payload,
3863                                               SilcChannelEntry channel)
3864 {
3865   SilcChannelKeyPayload payload = NULL;
3866   SilcChannelID *id = NULL;
3867   unsigned char *tmp, hash[32];
3868   SilcUInt32 tmp_len;
3869   char *cipher;
3870
3871   /* Decode channel key payload */
3872   payload = silc_channel_key_payload_parse(key_payload->data,
3873                                            key_payload->len);
3874   if (!payload) {
3875     SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3876     channel = NULL;
3877     goto out;
3878   }
3879
3880   /* Get the channel entry */
3881   if (!channel) {
3882
3883     /* Get channel ID */
3884     tmp = silc_channel_key_get_id(payload, &tmp_len);
3885     id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3886     if (!id) {
3887       channel = NULL;
3888       goto out;
3889     }
3890
3891     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3892     if (!channel) {
3893       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3894       if (!channel) {
3895         if (server->server_type == SILC_ROUTER)
3896           SILC_LOG_ERROR(("Received key for non-existent channel %s",
3897                           silc_id_render(id, SILC_ID_CHANNEL)));
3898         goto out;
3899       }
3900     }
3901   }
3902
3903   SILC_LOG_DEBUG(("Saving new channel %s key", channel->channel_name));
3904
3905   tmp = silc_channel_key_get_key(payload, &tmp_len);
3906   if (!tmp) {
3907     channel = NULL;
3908     goto out;
3909   }
3910
3911   cipher = silc_channel_key_get_cipher(payload, NULL);
3912   if (!cipher) {
3913     channel = NULL;
3914     goto out;
3915   }
3916
3917   /* Remove old key if exists */
3918   if (channel->key) {
3919     memset(channel->key, 0, channel->key_len / 8);
3920     silc_free(channel->key);
3921     silc_cipher_free(channel->channel_key);
3922   }
3923
3924   /* Create new cipher */
3925   if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3926     channel->channel_key = NULL;
3927     channel = NULL;
3928     goto out;
3929   }
3930
3931   if (channel->cipher)
3932     silc_free(channel->cipher);
3933   channel->cipher = strdup(cipher);
3934
3935   /* Save the key */
3936   channel->key_len = tmp_len * 8;
3937   channel->key = silc_memdup(tmp, tmp_len);
3938   silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3939
3940   /* Generate HMAC key from the channel key data and set it */
3941   if (!channel->hmac)
3942     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3943   silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3944   silc_hmac_set_key(channel->hmac, hash,
3945                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3946
3947   memset(hash, 0, sizeof(hash));
3948   memset(tmp, 0, tmp_len);
3949
3950   if (server->server_type == SILC_ROUTER) {
3951     if (!channel->rekey)
3952       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3953     channel->rekey->channel = channel;
3954     if (channel->rekey->task)
3955       silc_schedule_task_del(server->schedule, channel->rekey->task);
3956
3957     channel->rekey->task =
3958       silc_schedule_task_add(server->schedule, 0,
3959                              silc_server_channel_key_rekey,
3960                              (void *)channel->rekey,
3961                              server->config->channel_rekey_secs, 0,
3962                              SILC_TASK_TIMEOUT,
3963                              SILC_TASK_PRI_NORMAL);
3964   }
3965
3966  out:
3967   silc_free(id);
3968   if (payload)
3969     silc_channel_key_payload_free(payload);
3970
3971   return channel;
3972 }
3973
3974 /* Heartbeat callback. This function is set as argument for the
3975    silc_socket_set_heartbeat function. The library will call this function
3976    at the set time interval. */
3977
3978 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3979                                    void *hb_context)
3980 {
3981   SilcServer server = hb_context;
3982
3983   SILC_LOG_DEBUG(("Sending heartbeat to %s:%d (%s)", sock->hostname,
3984                  sock->port, sock->ip));
3985
3986   /* Send the heartbeat */
3987   silc_server_send_heartbeat(server, sock);
3988 }
3989
3990 /* Returns assembled of all servers in the given ID list. The packet's
3991    form is dictated by the New ID payload. */
3992
3993 static void silc_server_announce_get_servers(SilcServer server,
3994                                              SilcServerEntry remote,
3995                                              SilcIDList id_list,
3996                                              SilcBuffer *servers,
3997                                              unsigned long creation_time)
3998 {
3999   SilcIDCacheList list;
4000   SilcIDCacheEntry id_cache;
4001   SilcServerEntry entry;
4002   SilcBuffer idp;
4003
4004   /* Go through all clients in the list */
4005   if (silc_idcache_get_all(id_list->servers, &list)) {
4006     if (silc_idcache_list_first(list, &id_cache)) {
4007       while (id_cache) {
4008         entry = (SilcServerEntry)id_cache->context;
4009
4010         /* Do not announce the one we've sending our announcements and
4011            do not announce ourself. Also check the creation time if it's
4012            provided. */
4013         if ((entry == remote) || (entry == server->id_entry) ||
4014             (creation_time && entry->data.created < creation_time)) {
4015           if (!silc_idcache_list_next(list, &id_cache))
4016             break;
4017           continue;
4018         }
4019
4020         idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
4021
4022         *servers = silc_buffer_realloc(*servers,
4023                                        (*servers ?
4024                                         (*servers)->truelen + idp->len :
4025                                         idp->len));
4026         silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
4027         silc_buffer_put(*servers, idp->data, idp->len);
4028         silc_buffer_pull(*servers, idp->len);
4029         silc_buffer_free(idp);
4030
4031         if (!silc_idcache_list_next(list, &id_cache))
4032           break;
4033       }
4034     }
4035
4036     silc_idcache_list_free(list);
4037   }
4038 }
4039
4040 static SilcBuffer
4041 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
4042 {
4043   va_list ap;
4044   SilcBuffer p;
4045
4046   va_start(ap, argc);
4047   p = silc_notify_payload_encode(notify, argc, ap);
4048   va_end(ap);
4049
4050   return p;
4051 }
4052
4053 /* This function is used by router to announce existing servers to our
4054    primary router when we've connected to it. If `creation_time' is non-zero
4055    then only the servers that has been created after the `creation_time'
4056    will be announced. */
4057
4058 void silc_server_announce_servers(SilcServer server, bool global,
4059                                   unsigned long creation_time,
4060                                   SilcSocketConnection remote)
4061 {
4062   SilcBuffer servers = NULL;
4063
4064   SILC_LOG_DEBUG(("Announcing servers"));
4065
4066   /* Get servers in local list */
4067   silc_server_announce_get_servers(server, remote->user_data,
4068                                    server->local_list, &servers,
4069                                    creation_time);
4070
4071   if (global)
4072     /* Get servers in global list */
4073     silc_server_announce_get_servers(server, remote->user_data,
4074                                      server->global_list, &servers,
4075                                      creation_time);
4076
4077   if (servers) {
4078     silc_buffer_push(servers, servers->data - servers->head);
4079     SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
4080
4081     /* Send the packet */
4082     silc_server_packet_send(server, remote,
4083                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4084                             servers->data, servers->len, TRUE);
4085
4086     silc_buffer_free(servers);
4087   }
4088 }
4089
4090 /* Returns assembled packet of all clients in the given ID list. The
4091    packet's form is dictated by the New ID Payload. */
4092
4093 static void silc_server_announce_get_clients(SilcServer server,
4094                                              SilcIDList id_list,
4095                                              SilcBuffer *clients,
4096                                              SilcBuffer *umodes,
4097                                              unsigned long creation_time)
4098 {
4099   SilcIDCacheList list;
4100   SilcIDCacheEntry id_cache;
4101   SilcClientEntry client;
4102   SilcBuffer idp;
4103   SilcBuffer tmp;
4104   unsigned char mode[4];
4105
4106   /* Go through all clients in the list */
4107   if (silc_idcache_get_all(id_list->clients, &list)) {
4108     if (silc_idcache_list_first(list, &id_cache)) {
4109       while (id_cache) {
4110         client = (SilcClientEntry)id_cache->context;
4111
4112         if (creation_time && client->data.created < creation_time) {
4113           if (!silc_idcache_list_next(list, &id_cache))
4114             break;
4115           continue;
4116         }
4117         if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED) &&
4118             !client->connection && !client->router && !SILC_IS_LOCAL(client)) {
4119           if (!silc_idcache_list_next(list, &id_cache))
4120             break;
4121           continue;
4122         }
4123
4124         idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4125
4126         *clients = silc_buffer_realloc(*clients,
4127                                        (*clients ?
4128                                         (*clients)->truelen + idp->len :
4129                                         idp->len));
4130         silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
4131         silc_buffer_put(*clients, idp->data, idp->len);
4132         silc_buffer_pull(*clients, idp->len);
4133
4134         SILC_PUT32_MSB(client->mode, mode);
4135         tmp =
4136           silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
4137                                              2, idp->data, idp->len,
4138                                              mode, 4);
4139         *umodes = silc_buffer_realloc(*umodes,
4140                                       (*umodes ?
4141                                        (*umodes)->truelen + tmp->len :
4142                                        tmp->len));
4143         silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
4144         silc_buffer_put(*umodes, tmp->data, tmp->len);
4145         silc_buffer_pull(*umodes, tmp->len);
4146         silc_buffer_free(tmp);
4147
4148         silc_buffer_free(idp);
4149
4150         if (!silc_idcache_list_next(list, &id_cache))
4151           break;
4152       }
4153     }
4154
4155     silc_idcache_list_free(list);
4156   }
4157 }
4158
4159 /* This function is used to announce our existing clients to our router
4160    when we've connected to it. If `creation_time' is non-zero then only
4161    the clients that has been created after the `creation_time' will be
4162    announced. */
4163
4164 void silc_server_announce_clients(SilcServer server,
4165                                   unsigned long creation_time,
4166                                   SilcSocketConnection remote)
4167 {
4168   SilcBuffer clients = NULL;
4169   SilcBuffer umodes = NULL;
4170
4171   SILC_LOG_DEBUG(("Announcing clients"));
4172
4173   /* Get clients in local list */
4174   silc_server_announce_get_clients(server, server->local_list,
4175                                    &clients, &umodes, creation_time);
4176
4177   /* As router we announce our global list as well */
4178   if (server->server_type == SILC_ROUTER)
4179     silc_server_announce_get_clients(server, server->global_list,
4180                                      &clients, &umodes, creation_time);
4181
4182   if (clients) {
4183     silc_buffer_push(clients, clients->data - clients->head);
4184     SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
4185
4186     /* Send the packet */
4187     silc_server_packet_send(server, remote,
4188                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4189                             clients->data, clients->len, TRUE);
4190
4191     silc_buffer_free(clients);
4192   }
4193
4194   if (umodes) {
4195     silc_buffer_push(umodes, umodes->data - umodes->head);
4196     SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
4197
4198     /* Send the packet */
4199     silc_server_packet_send(server, remote,
4200                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4201                             umodes->data, umodes->len, TRUE);
4202
4203     silc_buffer_free(umodes);
4204   }
4205 }
4206
4207 /* Returns channel's topic for announcing it */
4208
4209 void silc_server_announce_get_channel_topic(SilcServer server,
4210                                             SilcChannelEntry channel,
4211                                             SilcBuffer *topic)
4212 {
4213   SilcBuffer chidp;
4214
4215   if (channel->topic) {
4216     chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4217     *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
4218                                                 chidp->data, chidp->len,
4219                                                 channel->topic,
4220                                                 strlen(channel->topic));
4221     silc_buffer_free(chidp);
4222   }
4223 }
4224
4225 /* Returns assembled packets for channel users of the `channel'. */
4226
4227 void silc_server_announce_get_channel_users(SilcServer server,
4228                                             SilcChannelEntry channel,
4229                                             SilcBuffer *channel_modes,
4230                                             SilcBuffer *channel_users,
4231                                             SilcBuffer *channel_users_modes)
4232 {
4233   SilcChannelClientEntry chl;
4234   SilcHashTableList htl;
4235   SilcBuffer chidp, clidp, csidp;
4236   SilcBuffer tmp;
4237   int len;
4238   unsigned char mode[4], *fkey = NULL;
4239   SilcUInt32 fkey_len = 0;
4240   char *hmac;
4241
4242   SILC_LOG_DEBUG(("Start"));
4243
4244   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4245   csidp = silc_id_payload_encode(server->id, SILC_ID_SERVER);
4246
4247   /* CMODE notify */
4248   SILC_PUT32_MSB(channel->mode, mode);
4249   hmac = channel->hmac ? (char *)silc_hmac_get_name(channel->hmac) : NULL;
4250   if (channel->founder_key)
4251     fkey = silc_pkcs_public_key_encode(channel->founder_key, &fkey_len);
4252   tmp =
4253     silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CMODE_CHANGE,
4254                                        6, csidp->data, csidp->len,
4255                                        mode, sizeof(mode),
4256                                        NULL, 0,
4257                                        hmac, hmac ? strlen(hmac) : 0,
4258                                        channel->passphrase,
4259                                        channel->passphrase ?
4260                                        strlen(channel->passphrase) : 0,
4261                                        fkey, fkey_len);
4262   len = tmp->len;
4263   *channel_modes =
4264     silc_buffer_realloc(*channel_modes,
4265                         (*channel_modes ?
4266                          (*channel_modes)->truelen + len : len));
4267   silc_buffer_pull_tail(*channel_modes,
4268                         ((*channel_modes)->end -
4269                          (*channel_modes)->data));
4270   silc_buffer_put(*channel_modes, tmp->data, tmp->len);
4271   silc_buffer_pull(*channel_modes, len);
4272   silc_buffer_free(tmp);
4273   silc_free(fkey);
4274   fkey = NULL;
4275   fkey_len = 0;
4276
4277   /* Now find all users on the channel */
4278   silc_hash_table_list(channel->user_list, &htl);
4279   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4280     clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4281
4282     /* JOIN Notify */
4283     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
4284                                              clidp->data, clidp->len,
4285                                              chidp->data, chidp->len);
4286     len = tmp->len;
4287     *channel_users =
4288       silc_buffer_realloc(*channel_users,
4289                           (*channel_users ?
4290                            (*channel_users)->truelen + len : len));
4291     silc_buffer_pull_tail(*channel_users,
4292                           ((*channel_users)->end -
4293                            (*channel_users)->data));
4294
4295     silc_buffer_put(*channel_users, tmp->data, tmp->len);
4296     silc_buffer_pull(*channel_users, len);
4297     silc_buffer_free(tmp);
4298
4299     /* CUMODE notify for mode change on the channel */
4300     SILC_PUT32_MSB(chl->mode, mode);
4301     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && channel->founder_key)
4302       fkey = silc_pkcs_public_key_encode(channel->founder_key, &fkey_len);
4303     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
4304                                              4, csidp->data, csidp->len,
4305                                              mode, sizeof(mode),
4306                                              clidp->data, clidp->len,
4307                                              fkey, fkey_len);
4308     len = tmp->len;
4309     *channel_users_modes =
4310       silc_buffer_realloc(*channel_users_modes,
4311                           (*channel_users_modes ?
4312                            (*channel_users_modes)->truelen + len : len));
4313     silc_buffer_pull_tail(*channel_users_modes,
4314                           ((*channel_users_modes)->end -
4315                            (*channel_users_modes)->data));
4316
4317     silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
4318     silc_buffer_pull(*channel_users_modes, len);
4319     silc_buffer_free(tmp);
4320     silc_free(fkey);
4321     fkey = NULL;
4322     fkey_len = 0;
4323     silc_buffer_free(clidp);
4324   }
4325   silc_hash_table_list_reset(&htl);
4326   silc_buffer_free(chidp);
4327   silc_buffer_free(csidp);
4328 }
4329
4330 /* Returns assembled packets for all channels and users on those channels
4331    from the given ID List. The packets are in the form dictated by the
4332    New Channel and New Channel User payloads. */
4333
4334 void silc_server_announce_get_channels(SilcServer server,
4335                                        SilcIDList id_list,
4336                                        SilcBuffer *channels,
4337                                        SilcBuffer **channel_modes,
4338                                        SilcBuffer *channel_users,
4339                                        SilcBuffer **channel_users_modes,
4340                                        SilcUInt32 *channel_users_modes_c,
4341                                        SilcBuffer **channel_topics,
4342                                        SilcChannelID ***channel_ids,
4343                                        unsigned long creation_time)
4344 {
4345   SilcIDCacheList list;
4346   SilcIDCacheEntry id_cache;
4347   SilcChannelEntry channel;
4348   unsigned char *cid;
4349   SilcUInt32 id_len;
4350   SilcUInt16 name_len;
4351   int len;
4352   int i = *channel_users_modes_c;
4353   bool announce;
4354
4355   SILC_LOG_DEBUG(("Start"));
4356
4357   /* Go through all channels in the list */
4358   if (silc_idcache_get_all(id_list->channels, &list)) {
4359     if (silc_idcache_list_first(list, &id_cache)) {
4360       while (id_cache) {
4361         channel = (SilcChannelEntry)id_cache->context;
4362
4363         if (creation_time && channel->created < creation_time)
4364           announce = FALSE;
4365         else
4366           announce = TRUE;
4367
4368         cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4369         id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4370         name_len = strlen(channel->channel_name);
4371
4372         if (announce) {
4373           len = 4 + name_len + id_len + 4;
4374           *channels =
4375             silc_buffer_realloc(*channels,
4376                                 (*channels ? (*channels)->truelen +
4377                                  len : len));
4378           silc_buffer_pull_tail(*channels,
4379                                 ((*channels)->end - (*channels)->data));
4380           silc_buffer_format(*channels,
4381                              SILC_STR_UI_SHORT(name_len),
4382                              SILC_STR_UI_XNSTRING(channel->channel_name,
4383                                                   name_len),
4384                              SILC_STR_UI_SHORT(id_len),
4385                              SILC_STR_UI_XNSTRING(cid, id_len),
4386                              SILC_STR_UI_INT(channel->mode),
4387                              SILC_STR_END);
4388           silc_buffer_pull(*channels, len);
4389         }
4390
4391         if (creation_time && channel->updated < creation_time)
4392           announce = FALSE;
4393         else
4394           announce = TRUE;
4395
4396         if (announce) {
4397           /* Channel user modes */
4398           *channel_users_modes = silc_realloc(*channel_users_modes,
4399                                               sizeof(**channel_users_modes) *
4400                                               (i + 1));
4401           (*channel_users_modes)[i] = NULL;
4402           *channel_modes = silc_realloc(*channel_modes,
4403                                         sizeof(**channel_modes) * (i + 1));
4404           (*channel_modes)[i] = NULL;
4405           *channel_ids = silc_realloc(*channel_ids,
4406                                       sizeof(**channel_ids) * (i + 1));
4407           (*channel_ids)[i] = NULL;
4408           silc_server_announce_get_channel_users(server, channel,
4409                                                  &(*channel_modes)[i],
4410                                                  channel_users,
4411                                                  &(*channel_users_modes)[i]);
4412           (*channel_ids)[i] = channel->id;
4413
4414           /* Channel's topic */
4415           *channel_topics = silc_realloc(*channel_topics,
4416                                          sizeof(**channel_topics) * (i + 1));
4417           (*channel_topics)[i] = NULL;
4418           silc_server_announce_get_channel_topic(server, channel,
4419                                                  &(*channel_topics)[i]);
4420           (*channel_users_modes_c)++;
4421
4422           silc_free(cid);
4423
4424           i++;
4425         }
4426
4427         if (!silc_idcache_list_next(list, &id_cache))
4428           break;
4429       }
4430     }
4431
4432     silc_idcache_list_free(list);
4433   }
4434 }
4435
4436 /* This function is used to announce our existing channels to our router
4437    when we've connected to it. This also announces the users on the
4438    channels to the router. If the `creation_time' is non-zero only the
4439    channels that was created after the `creation_time' are announced.
4440    Note that the channel users are still announced even if the `creation_time'
4441    was provided. */
4442
4443 void silc_server_announce_channels(SilcServer server,
4444                                    unsigned long creation_time,
4445                                    SilcSocketConnection remote)
4446 {
4447   SilcBuffer channels = NULL, *channel_modes = NULL, channel_users = NULL;
4448   SilcBuffer *channel_users_modes = NULL;
4449   SilcBuffer *channel_topics = NULL;
4450   SilcUInt32 channel_users_modes_c = 0;
4451   SilcChannelID **channel_ids = NULL;
4452
4453   SILC_LOG_DEBUG(("Announcing channels and channel users"));
4454
4455   /* Get channels and channel users in local list */
4456   silc_server_announce_get_channels(server, server->local_list,
4457                                     &channels, &channel_modes,
4458                                     &channel_users,
4459                                     &channel_users_modes,
4460                                     &channel_users_modes_c,
4461                                     &channel_topics,
4462                                     &channel_ids, creation_time);
4463
4464   /* Get channels and channel users in global list */
4465   if (server->server_type != SILC_SERVER)
4466     silc_server_announce_get_channels(server, server->global_list,
4467                                       &channels, &channel_modes,
4468                                       &channel_users,
4469                                       &channel_users_modes,
4470                                       &channel_users_modes_c,
4471                                       &channel_topics,
4472                                       &channel_ids, creation_time);
4473
4474   if (channels) {
4475     silc_buffer_push(channels, channels->data - channels->head);
4476     SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
4477
4478     /* Send the packet */
4479     silc_server_packet_send(server, remote,
4480                             SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
4481                             channels->data, channels->len,
4482                             FALSE);
4483
4484     silc_buffer_free(channels);
4485   }
4486
4487   if (channel_users) {
4488     silc_buffer_push(channel_users, channel_users->data - channel_users->head);
4489     SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
4490                      channel_users->len);
4491
4492     /* Send the packet */
4493     silc_server_packet_send(server, remote,
4494                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4495                             channel_users->data, channel_users->len,
4496                             FALSE);
4497
4498     silc_buffer_free(channel_users);
4499   }
4500
4501   if (channel_modes) {
4502     int i;
4503
4504     for (i = 0; i < channel_users_modes_c; i++) {
4505       if (!channel_modes[i])
4506         continue;
4507       silc_buffer_push(channel_modes[i],
4508                        channel_modes[i]->data -
4509                        channel_modes[i]->head);
4510       SILC_LOG_HEXDUMP(("channel modes"), channel_modes[i]->data,
4511                        channel_modes[i]->len);
4512       silc_server_packet_send_dest(server, remote,
4513                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4514                                    channel_ids[i], SILC_ID_CHANNEL,
4515                                    channel_modes[i]->data,
4516                                    channel_modes[i]->len,
4517                                    FALSE);
4518       silc_buffer_free(channel_modes[i]);
4519     }
4520     silc_free(channel_modes);
4521   }
4522
4523   if (channel_users_modes) {
4524     int i;
4525
4526     for (i = 0; i < channel_users_modes_c; i++) {
4527       if (!channel_users_modes[i])
4528         continue;
4529       silc_buffer_push(channel_users_modes[i],
4530                        channel_users_modes[i]->data -
4531                        channel_users_modes[i]->head);
4532       SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
4533                        channel_users_modes[i]->len);
4534       silc_server_packet_send_dest(server, remote,
4535                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4536                                    channel_ids[i], SILC_ID_CHANNEL,
4537                                    channel_users_modes[i]->data,
4538                                    channel_users_modes[i]->len,
4539                                    FALSE);
4540       silc_buffer_free(channel_users_modes[i]);
4541     }
4542     silc_free(channel_users_modes);
4543   }
4544
4545   if (channel_topics) {
4546     int i;
4547
4548     for (i = 0; i < channel_users_modes_c; i++) {
4549       if (!channel_topics[i])
4550         continue;
4551
4552       silc_buffer_push(channel_topics[i],
4553                        channel_topics[i]->data -
4554                        channel_topics[i]->head);
4555       SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
4556                        channel_topics[i]->len);
4557       silc_server_packet_send_dest(server, remote,
4558                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4559                                    channel_ids[i], SILC_ID_CHANNEL,
4560                                    channel_topics[i]->data,
4561                                    channel_topics[i]->len,
4562                                    FALSE);
4563       silc_buffer_free(channel_topics[i]);
4564     }
4565     silc_free(channel_topics);
4566   }
4567
4568   silc_free(channel_ids);
4569 }
4570
4571 /* Failure timeout callback. If this is called then we will immediately
4572    process the received failure. We always process the failure with timeout
4573    since we do not want to blindly trust to received failure packets.
4574    This won't be called (the timeout is cancelled) if the failure was
4575    bogus (it is bogus if remote does not close the connection after sending
4576    the failure). */
4577
4578 SILC_TASK_CALLBACK(silc_server_failure_callback)
4579 {
4580   SilcServer server = app_context;
4581   SilcServerFailureContext f = (SilcServerFailureContext)context;
4582
4583   if (f->sock->protocol) {
4584     f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
4585     silc_protocol_execute(f->sock->protocol, server->schedule, 0, 0);
4586   }
4587
4588   silc_socket_free(f->sock);
4589   silc_free(f);
4590 }
4591
4592 /* Assembles user list and users mode list from the `channel'. */
4593
4594 bool silc_server_get_users_on_channel(SilcServer server,
4595                                       SilcChannelEntry channel,
4596                                       SilcBuffer *user_list,
4597                                       SilcBuffer *mode_list,
4598                                       SilcUInt32 *user_count)
4599 {
4600   SilcChannelClientEntry chl;
4601   SilcHashTableList htl;
4602   SilcBuffer client_id_list;
4603   SilcBuffer client_mode_list;
4604   SilcBuffer idp;
4605   SilcUInt32 list_count = 0, len = 0;
4606
4607   if (!silc_hash_table_count(channel->user_list))
4608     return FALSE;
4609
4610   silc_hash_table_list(channel->user_list, &htl);
4611   while (silc_hash_table_get(&htl, NULL, (void *)&chl))
4612     len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
4613   silc_hash_table_list_reset(&htl);
4614
4615   client_id_list = silc_buffer_alloc(len);
4616   client_mode_list =
4617     silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
4618   silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
4619   silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
4620
4621   silc_hash_table_list(channel->user_list, &htl);
4622   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4623     /* Client ID */
4624     idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4625     silc_buffer_put(client_id_list, idp->data, idp->len);
4626     silc_buffer_pull(client_id_list, idp->len);
4627     silc_buffer_free(idp);
4628
4629     /* Client's mode on channel */
4630     SILC_PUT32_MSB(chl->mode, client_mode_list->data);
4631     silc_buffer_pull(client_mode_list, 4);
4632
4633     list_count++;
4634   }
4635   silc_hash_table_list_reset(&htl);
4636   silc_buffer_push(client_id_list,
4637                    client_id_list->data - client_id_list->head);
4638   silc_buffer_push(client_mode_list,
4639                    client_mode_list->data - client_mode_list->head);
4640
4641   *user_list = client_id_list;
4642   *mode_list = client_mode_list;
4643   *user_count = list_count;
4644   return TRUE;
4645 }
4646
4647 /* Saves users and their modes to the `channel'. */
4648
4649 void silc_server_save_users_on_channel(SilcServer server,
4650                                        SilcSocketConnection sock,
4651                                        SilcChannelEntry channel,
4652                                        SilcClientID *noadd,
4653                                        SilcBuffer user_list,
4654                                        SilcBuffer mode_list,
4655                                        SilcUInt32 user_count)
4656 {
4657   int i;
4658   SilcUInt16 idp_len;
4659   SilcUInt32 mode;
4660   SilcClientID *client_id;
4661   SilcClientEntry client;
4662   SilcIDCacheEntry cache;
4663   SilcChannelClientEntry chl;
4664
4665   SILC_LOG_DEBUG(("Saving %d users on %s channel", user_count,
4666                   channel->channel_name));
4667
4668   for (i = 0; i < user_count; i++) {
4669     /* Client ID */
4670     SILC_GET16_MSB(idp_len, user_list->data + 2);
4671     idp_len += 4;
4672     client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
4673     silc_buffer_pull(user_list, idp_len);
4674     if (!client_id)
4675       continue;
4676
4677     /* Mode */
4678     SILC_GET32_MSB(mode, mode_list->data);
4679     silc_buffer_pull(mode_list, 4);
4680
4681     if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
4682       silc_free(client_id);
4683       continue;
4684     }
4685
4686     cache = NULL;
4687
4688     /* Check if we have this client cached already. */
4689     client = silc_idlist_find_client_by_id(server->local_list, client_id,
4690                                            server->server_type, &cache);
4691     if (!client)
4692       client = silc_idlist_find_client_by_id(server->global_list,
4693                                              client_id, server->server_type,
4694                                              &cache);
4695     if (!client) {
4696       /* If router did not find such Client ID in its lists then this must
4697          be bogus client or some router in the net is buggy. */
4698       if (server->server_type != SILC_SERVER) {
4699         silc_free(client_id);
4700         continue;
4701       }
4702
4703       /* We don't have that client anywhere, add it. The client is added
4704          to global list since server didn't have it in the lists so it must be
4705          global. */
4706       client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
4707                                       silc_id_dup(client_id, SILC_ID_CLIENT),
4708                                       sock->user_data, NULL, 0);
4709       if (!client) {
4710         SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
4711         silc_free(client_id);
4712         continue;
4713       }
4714
4715       client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
4716     }
4717
4718     if (cache)
4719       cache->expire = 0;
4720     silc_free(client_id);
4721
4722     if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED)) {
4723       SILC_LOG_ERROR(("Attempting to add unregistered client to channel ",
4724                       "%s", channel->channel_name));
4725       continue;
4726     }
4727
4728     if (!silc_server_client_on_channel(client, channel, &chl)) {
4729       /* Client was not on the channel, add it. */
4730       chl = silc_calloc(1, sizeof(*chl));
4731       chl->client = client;
4732       chl->mode = mode;
4733       chl->channel = channel;
4734       silc_hash_table_add(channel->user_list, chl->client, chl);
4735       silc_hash_table_add(client->channels, chl->channel, chl);
4736       channel->user_count++;
4737     } else {
4738       /* Update mode */
4739       chl->mode = mode;
4740     }
4741   }
4742 }
4743
4744 /* Saves channels and channels user modes to the `client'.  Removes
4745    the client from those channels that are not sent in the list but
4746    it has joined. */
4747
4748 void silc_server_save_user_channels(SilcServer server,
4749                                     SilcSocketConnection sock,
4750                                     SilcClientEntry client,
4751                                     SilcBuffer channels,
4752                                     SilcBuffer channels_user_modes)
4753 {
4754   SilcDList ch;
4755   SilcUInt32 *chumodes;
4756   SilcChannelPayload entry;
4757   SilcChannelEntry channel;
4758   SilcChannelID *channel_id;
4759   SilcChannelClientEntry chl;
4760   SilcHashTable ht = NULL;
4761   SilcHashTableList htl;
4762   char *name;
4763   int i = 0;
4764
4765   if (!channels || !channels_user_modes ||
4766       !(client->data.status & SILC_IDLIST_STATUS_REGISTERED))
4767     goto out;
4768
4769   ch = silc_channel_payload_parse_list(channels->data, channels->len);
4770   if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4771                                &chumodes)) {
4772     ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4773                                NULL, NULL, NULL, TRUE);
4774     silc_dlist_start(ch);
4775     while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4776       /* Check if we have this channel, and add it if we don't have it.
4777          Also add the client on the channel unless it is there already. */
4778       channel_id = silc_channel_get_id_parse(entry);
4779       channel = silc_idlist_find_channel_by_id(server->local_list,
4780                                                channel_id, NULL);
4781       if (!channel)
4782         channel = silc_idlist_find_channel_by_id(server->global_list,
4783                                                  channel_id, NULL);
4784       if (!channel) {
4785         if (server->server_type != SILC_SERVER) {
4786           silc_free(channel_id);
4787           i++;
4788           continue;
4789         }
4790
4791         /* We don't have that channel anywhere, add it. */
4792         name = silc_channel_get_name(entry, NULL);
4793         channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4794                                           channel_id, server->router,
4795                                           NULL, NULL, 0);
4796         if (!channel) {
4797           silc_free(channel_id);
4798           i++;
4799           continue;
4800         }
4801         channel_id = NULL;
4802       }
4803
4804       channel->mode = silc_channel_get_mode(entry);
4805
4806       /* Add the client on the channel */
4807       if (!silc_server_client_on_channel(client, channel, &chl)) {
4808         chl = silc_calloc(1, sizeof(*chl));
4809         chl->client = client;
4810         chl->mode = chumodes[i++];
4811         chl->channel = channel;
4812         silc_hash_table_add(channel->user_list, chl->client, chl);
4813         silc_hash_table_add(client->channels, chl->channel, chl);
4814         channel->user_count++;
4815       } else {
4816         /* Update mode */
4817         chl->mode = chumodes[i++];
4818       }
4819
4820       silc_hash_table_add(ht, channel, channel);
4821       silc_free(channel_id);
4822     }
4823     silc_channel_payload_list_free(ch);
4824     silc_free(chumodes);
4825   }
4826
4827  out:
4828   /* Go through the list again and remove client from channels that
4829      are no part of the list. */
4830   if (ht) {
4831     silc_hash_table_list(client->channels, &htl);
4832     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4833       if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4834         silc_hash_table_del(chl->channel->user_list, chl->client);
4835         silc_hash_table_del(chl->client->channels, chl->channel);
4836         silc_free(chl);
4837       }
4838     }
4839     silc_hash_table_list_reset(&htl);
4840     silc_hash_table_free(ht);
4841   } else {
4842     silc_hash_table_list(client->channels, &htl);
4843     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4844       silc_hash_table_del(chl->channel->user_list, chl->client);
4845       silc_hash_table_del(chl->client->channels, chl->channel);
4846       silc_free(chl);
4847     }
4848     silc_hash_table_list_reset(&htl);
4849   }
4850 }
4851
4852 /* Lookups route to the client indicated by the `id_data'. The connection
4853    object and internal data object is returned. Returns NULL if route
4854    could not be found to the client. If the `client_id' is specified then
4855    it is used and the `id_data' is ignored. */
4856
4857 SilcSocketConnection
4858 silc_server_get_client_route(SilcServer server,
4859                              unsigned char *id_data,
4860                              SilcUInt32 id_len,
4861                              SilcClientID *client_id,
4862                              SilcIDListData *idata,
4863                              SilcClientEntry *client_entry)
4864 {
4865   SilcClientID *id;
4866   SilcClientEntry client;
4867
4868   SILC_LOG_DEBUG(("Start"));
4869
4870   if (client_entry)
4871     *client_entry = NULL;
4872
4873   /* Decode destination Client ID */
4874   if (!client_id) {
4875     id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4876     if (!id) {
4877       SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4878       return NULL;
4879     }
4880   } else {
4881     id = silc_id_dup(client_id, SILC_ID_CLIENT);
4882   }
4883
4884   /* If the destination belongs to our server we don't have to route
4885      the packet anywhere but to send it to the local destination. */
4886   client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4887   if (client) {
4888     silc_free(id);
4889
4890     /* If we are router and the client has router then the client is in
4891        our cell but not directly connected to us. */
4892     if (server->server_type == SILC_ROUTER && client->router) {
4893       /* We are of course in this case the client's router thus the route
4894          to the client is the server who owns the client. So, we will send
4895          the packet to that server. */
4896       if (idata)
4897         *idata = (SilcIDListData)client->router;
4898       return client->router->connection;
4899     }
4900
4901     /* Seems that client really is directly connected to us */
4902     if (idata)
4903       *idata = (SilcIDListData)client;
4904     if (client_entry)
4905       *client_entry = client;
4906     return client->connection;
4907   }
4908
4909   /* Destination belongs to someone not in this server. If we are normal
4910      server our action is to send the packet to our router. */
4911   if (server->server_type != SILC_ROUTER && !server->standalone) {
4912     silc_free(id);
4913     if (idata)
4914       *idata = (SilcIDListData)server->router;
4915     return SILC_PRIMARY_ROUTE(server);
4916   }
4917
4918   /* We are router and we will perform route lookup for the destination
4919      and send the packet to fastest route. */
4920   if (server->server_type == SILC_ROUTER && !server->standalone) {
4921     /* Check first that the ID is valid */
4922     client = silc_idlist_find_client_by_id(server->global_list, id,
4923                                            TRUE, NULL);
4924     if (client) {
4925       SilcSocketConnection dst_sock;
4926
4927       dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4928
4929       silc_free(id);
4930       if (idata)
4931         *idata = (SilcIDListData)dst_sock->user_data;
4932       return dst_sock;
4933     }
4934   }
4935
4936   silc_free(id);
4937   return NULL;
4938 }
4939
4940 /* Encodes and returns channel list of channels the `client' has joined.
4941    Secret channels are not put to the list. */
4942
4943 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4944                                                SilcClientEntry client,
4945                                                bool get_private,
4946                                                bool get_secret,
4947                                                SilcBuffer *user_mode_list)
4948 {
4949   SilcBuffer buffer = NULL;
4950   SilcChannelEntry channel;
4951   SilcChannelClientEntry chl;
4952   SilcHashTableList htl;
4953   unsigned char *cid;
4954   SilcUInt32 id_len;
4955   SilcUInt16 name_len;
4956   int len;
4957
4958   if (user_mode_list)
4959     *user_mode_list = NULL;
4960
4961   silc_hash_table_list(client->channels, &htl);
4962   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4963     channel = chl->channel;
4964
4965     if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4966       continue;
4967     if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4968       continue;
4969
4970     cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4971     id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4972     name_len = strlen(channel->channel_name);
4973
4974     len = 4 + name_len + id_len + 4;
4975     buffer = silc_buffer_realloc(buffer,
4976                                  (buffer ? buffer->truelen + len : len));
4977     silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4978     silc_buffer_format(buffer,
4979                        SILC_STR_UI_SHORT(name_len),
4980                        SILC_STR_UI_XNSTRING(channel->channel_name,
4981                                             name_len),
4982                        SILC_STR_UI_SHORT(id_len),
4983                        SILC_STR_UI_XNSTRING(cid, id_len),
4984                        SILC_STR_UI_INT(chl->channel->mode),
4985                        SILC_STR_END);
4986     silc_buffer_pull(buffer, len);
4987     silc_free(cid);
4988
4989     if (user_mode_list) {
4990       *user_mode_list = silc_buffer_realloc(*user_mode_list,
4991                                             (*user_mode_list ?
4992                                              (*user_mode_list)->truelen + 4 :
4993                                              4));
4994       silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
4995                                               (*user_mode_list)->data));
4996       SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
4997       silc_buffer_pull(*user_mode_list, 4);
4998     }
4999   }
5000   silc_hash_table_list_reset(&htl);
5001
5002   if (buffer)
5003     silc_buffer_push(buffer, buffer->data - buffer->head);
5004   if (user_mode_list && *user_mode_list)
5005     silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
5006                                        (*user_mode_list)->head));
5007
5008   return buffer;
5009 }
5010
5011 /* A timeout callback for the re-key. We will be the initiator of the
5012    re-key protocol. */
5013
5014 SILC_TASK_CALLBACK(silc_server_rekey_callback)
5015 {
5016   SilcServer server = app_context;
5017   SilcSocketConnection sock = (SilcSocketConnection)context;
5018   SilcIDListData idata = (SilcIDListData)sock->user_data;
5019   SilcProtocol protocol;
5020   SilcServerRekeyInternalContext *proto_ctx;
5021
5022   /* Allocate internal protocol context. This is sent as context
5023      to the protocol. */
5024   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
5025   proto_ctx->server = (void *)server;
5026   proto_ctx->sock = sock;
5027   proto_ctx->responder = FALSE;
5028   proto_ctx->pfs = idata->rekey->pfs;
5029
5030   /* Perform rekey protocol. Will call the final callback after the
5031      protocol is over. */
5032   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
5033                       &protocol, proto_ctx, silc_server_rekey_final);
5034   sock->protocol = protocol;
5035
5036   /* Run the protocol */
5037   silc_protocol_execute(protocol, server->schedule, 0, 0);
5038
5039   SILC_LOG_DEBUG(("Rekey protocol completed"));
5040
5041   /* Re-register re-key timeout */
5042   silc_schedule_task_add(server->schedule, sock->sock,
5043                          silc_server_rekey_callback,
5044                          context, idata->rekey->timeout, 0,
5045                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
5046 }
5047
5048 /* The final callback for the REKEY protocol. This will actually take the
5049    new key material into use. */
5050
5051 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
5052 {
5053   SilcProtocol protocol = (SilcProtocol)context;
5054   SilcServerRekeyInternalContext *ctx =
5055     (SilcServerRekeyInternalContext *)protocol->context;
5056   SilcServer server = (SilcServer)ctx->server;
5057   SilcSocketConnection sock = ctx->sock;
5058
5059   SILC_LOG_DEBUG(("Start"));
5060
5061   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
5062       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
5063     /* Error occured during protocol */
5064     SILC_LOG_ERROR(("Error occurred during rekey protocol"));
5065     silc_protocol_cancel(protocol, server->schedule);
5066     silc_protocol_free(protocol);
5067     sock->protocol = NULL;
5068     if (ctx->packet)
5069       silc_packet_context_free(ctx->packet);
5070     if (ctx->ske)
5071       silc_ske_free(ctx->ske);
5072     silc_free(ctx);
5073     return;
5074   }
5075
5076   /* Purge the outgoing data queue to assure that all rekey packets really
5077      go to the network before we quit the protocol. */
5078   silc_server_packet_queue_purge(server, sock);
5079
5080   /* Cleanup */
5081   silc_protocol_free(protocol);
5082   sock->protocol = NULL;
5083   if (ctx->packet)
5084     silc_packet_context_free(ctx->packet);
5085   if (ctx->ske)
5086     silc_ske_free(ctx->ske);
5087   silc_free(ctx);
5088 }
5089
5090 /* Task callback used to retrieve network statistical information from
5091    router server once in a while. */
5092
5093 SILC_TASK_CALLBACK(silc_server_get_stats)
5094 {
5095   SilcServer server = (SilcServer)context;
5096   SilcBuffer idp, packet;
5097
5098   SILC_LOG_DEBUG(("Retrieving stats from router"));
5099
5100   if (!server->standalone) {
5101     idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
5102     packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
5103                                             ++server->cmd_ident, 1,
5104                                             1, idp->data, idp->len);
5105     silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
5106                             SILC_PACKET_COMMAND, 0, packet->data,
5107                             packet->len, FALSE);
5108     silc_buffer_free(packet);
5109     silc_buffer_free(idp);
5110   }
5111
5112   silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
5113                          server, 120, 0, SILC_TASK_TIMEOUT,
5114                          SILC_TASK_PRI_LOW);
5115 }