apps/silcd/server.c

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