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