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_get_stats);
  47
  48 /* Allocates a new SILC server object. This has to be done before the server
  49    can be used. After allocation one must call silc_server_init to initialize
  50    the server. The new allocated server object is returned to the new_server
  51    argument. */
  52
  53 int silc_server_alloc(SilcServer *new_server)
  54 {
  55   SilcServer server;
  56
  57   SILC_LOG_DEBUG(("Allocating new server object"));
  58
  59   server = silc_calloc(1, sizeof(*server));
  60   server->server_type = SILC_SERVER;
  61   server->standalone = TRUE;
  62   server->local_list = silc_calloc(1, sizeof(*server->local_list));
  63   server->global_list = silc_calloc(1, sizeof(*server->global_list));
  64   server->pending_commands = silc_dlist_init();
  65 #ifdef SILC_SIM
  66   server->sim = silc_dlist_init();
  67 #endif
  68
  69   *new_server = server;
  70
  71   return TRUE;
  72 }
  73
  74 /* Free's the SILC server object. This is called at the very end before
  75    the program ends. */
  76
  77 void silc_server_free(SilcServer server)
  78 {
  79   SilcIDCacheList list;
  80   SilcIDCacheEntry cache;
  81
  82   if (!server)
  83     return;
  84
  85 #ifdef SILC_SIM
  86   {
  87     SilcSim sim;
  88
  89     while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
  90       silc_dlist_del(server->sim, sim);
  91       silc_sim_free(sim);
  92     }
  93     silc_dlist_uninit(server->sim);
  94   }
  95 #endif
  96
  97   silc_server_backup_free(server);
  98   silc_server_config_unref(&server->config_ref);
  99   if (server->rng)
 100     silc_rng_free(server->rng);
 101   if (server->pkcs)
 102     silc_pkcs_free(server->pkcs);
 103   if (server->public_key)
 104     silc_pkcs_public_key_free(server->public_key);
 105   if (server->private_key)
 106     silc_pkcs_private_key_free(server->private_key);
 107   if (server->pending_commands)
 108     silc_dlist_uninit(server->pending_commands);
 109   if (server->id_entry)
 110     silc_idlist_del_server(server->local_list, server->id_entry);
 111
 112   /* Delete all channels */
 113   list = NULL;
 114   if (silc_idcache_get_all(server->local_list->channels, &list) &&
 115       silc_idcache_list_first(list, &cache)) {
 116     silc_idlist_del_channel(server->local_list, cache->context);
 117     while (silc_idcache_list_next(list, &cache))
 118       silc_idlist_del_channel(server->local_list, cache->context);
 119   }
 120   if (list)
 121     silc_idcache_list_free(list);
 122   list = NULL;
 123   if (silc_idcache_get_all(server->global_list->channels, &list) &&
 124       silc_idcache_list_first(list, &cache)) {
 125     silc_idlist_del_channel(server->global_list, cache->context);
 126     while (silc_idcache_list_next(list, &cache))
 127       silc_idlist_del_channel(server->global_list, cache->context);
 128   }
 129   if (list)
 130     silc_idcache_list_free(list);
 131
 132   /* Delete all clients */
 133   list = NULL;
 134   if (silc_idcache_get_all(server->local_list->clients, &list) &&
 135       silc_idcache_list_first(list, &cache)) {
 136     silc_idlist_del_client(server->local_list, cache->context);
 137     while (silc_idcache_list_next(list, &cache))
 138       silc_idlist_del_client(server->local_list, cache->context);
 139   }
 140   if (list)
 141     silc_idcache_list_free(list);
 142   list = NULL;
 143   if (silc_idcache_get_all(server->global_list->clients, &list) &&
 144       silc_idcache_list_first(list, &cache)) {
 145     silc_idlist_del_client(server->global_list, cache->context);
 146     while (silc_idcache_list_next(list, &cache))
 147       silc_idlist_del_client(server->global_list, cache->context);
 148   }
 149   if (list)
 150     silc_idcache_list_free(list);
 151
 152   /* Delete all servers */
 153   list = NULL;
 154   if (silc_idcache_get_all(server->local_list->servers, &list) &&
 155       silc_idcache_list_first(list, &cache)) {
 156     silc_idlist_del_server(server->local_list, cache->context);
 157     while (silc_idcache_list_next(list, &cache))
 158       silc_idlist_del_server(server->local_list, cache->context);
 159   }
 160   if (list)
 161     silc_idcache_list_free(list);
 162   list = NULL;
 163   if (silc_idcache_get_all(server->global_list->servers, &list) &&
 164       silc_idcache_list_first(list, &cache)) {
 165     silc_idlist_del_server(server->global_list, cache->context);
 166     while (silc_idcache_list_next(list, &cache))
 167       silc_idlist_del_server(server->global_list, cache->context);
 168   }
 169   if (list)
 170     silc_idcache_list_free(list);
 171
 172   silc_idcache_free(server->local_list->clients);
 173   silc_idcache_free(server->local_list->servers);
 174   silc_idcache_free(server->local_list->channels);
 175   silc_idcache_free(server->global_list->clients);
 176   silc_idcache_free(server->global_list->servers);
 177   silc_idcache_free(server->global_list->channels);
 178   silc_hash_table_free(server->watcher_list);
 179
 180   silc_hash_free(server->md5hash);
 181   silc_hash_free(server->sha1hash);
 182   silc_hmac_unregister_all();
 183   silc_hash_unregister_all();
 184   silc_cipher_unregister_all();
 185   silc_pkcs_unregister_all();
 186
 187   silc_free(server->local_list);
 188   silc_free(server->global_list);
 189   silc_free(server->server_name);
 190   silc_free(server->id_string);
 191   silc_free(server->purge_i);
 192   silc_free(server->purge_g);
 193   silc_free(server);
 194 }
 195
 196 /* Creates a new server listener. */
 197
 198 static bool silc_server_listen(SilcServer server, const char *server_ip,
 199                                SilcUInt16 port, int *sock)
 200 {
 201   *sock = silc_net_create_server(port, server_ip);
 202   if (*sock < 0) {
 203     SILC_SERVER_LOG_ERROR(("Could not create server listener: %s on %hu",
 204                         server_ip, port));
 205     return FALSE;
 206   }
 207   return TRUE;
 208 }
 209
 210 /* Adds a secondary listener. */
 211
 212 bool silc_server_init_secondary(SilcServer server)
 213 {
 214   int sock = 0, sock_list[server->config->param.connections_max];
 215   SilcSocketConnection newsocket = NULL;
 216   SilcServerConfigServerInfoInterface *interface;
 217
 218   for (interface = server->config->server_info->secondary; interface;
 219         interface = interface->next, sock++) {
 220
 221     if (!silc_server_listen(server,
 222         interface->server_ip, interface->port, &sock_list[sock]))
 223       goto err;
 224
 225     /* Set socket to non-blocking mode */
 226     silc_net_set_socket_nonblock(sock_list[sock]);
 227
 228     /* Add ourselves also to the socket table. The entry allocated above
 229        is sent as argument for fast referencing in the future. */
 230     silc_socket_alloc(sock_list[sock],
 231                       SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
 232     server->sockets[sock_list[sock]] = newsocket;
 233     SILC_SET_LISTENER(newsocket);
 234
 235     /* Perform name and address lookups to resolve the listenning address
 236        and port. */
 237     if (!silc_net_check_local_by_sock(sock_list[sock], &newsocket->hostname,
 238                             &newsocket->ip)) {
 239       if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
 240         !newsocket->ip) {
 241         SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
 242                       newsocket->hostname ? newsocket->hostname :
 243                       newsocket->ip ? newsocket->ip : ""));
 244         server->stat.conn_failures++;
 245         goto err;
 246       }
 247       if (!newsocket->hostname)
 248         newsocket->hostname = strdup(newsocket->ip);
 249     }
 250     newsocket->port = silc_net_get_local_port(sock);
 251
 252     newsocket->user_data = (void *)server->id_entry;
 253     silc_schedule_task_add(server->schedule, sock_list[sock],
 254                            silc_server_accept_new_connection,
 255                            (void *)server, 0, 0,
 256                            SILC_TASK_FD,
 257                            SILC_TASK_PRI_NORMAL);
 258   }
 259
 260   return TRUE;
 261
 262  err:
 263   do silc_net_close_server(sock_list[sock--]); while (sock >= 0);
 264   return FALSE;
 265 }
 266
 267 /* Initializes the entire SILC server. This is called always before running
 268    the server. This is called only once at the initialization of the program.
 269    This binds the server to its listenning port. After this function returns
 270    one should call silc_server_run to start the server. This returns TRUE
 271    when everything is ok to run the server. Configuration file must be
 272    read and parsed before calling this. */
 273
 274 bool silc_server_init(SilcServer server)
 275 {
 276   int sock;
 277   SilcServerID *id;
 278   SilcServerEntry id_entry;
 279   SilcIDListPurge purge;
 280   SilcSocketConnection newsocket = NULL;
 281
 282   SILC_LOG_DEBUG(("Initializing server"));
 283
 284   server->starttime = time(NULL);
 285
 286   /* Take config object for us */
 287   silc_server_config_ref(&server->config_ref, server->config,
 288                          server->config);
 289
 290   /* Steal public and private key from the config object */
 291   server->public_key = server->config->server_info->public_key;
 292   server->private_key = server->config->server_info->private_key;
 293   server->config->server_info->public_key = NULL;
 294   server->config->server_info->private_key = NULL;
 295
 296   /* Register all configured ciphers, PKCS and hash functions. */
 297   if (!silc_server_config_register_ciphers(server))
 298     silc_cipher_register_default();
 299   if (!silc_server_config_register_pkcs(server))
 300     silc_pkcs_register_default();
 301   if (!silc_server_config_register_hashfuncs(server))
 302     silc_hash_register_default();
 303   if (!silc_server_config_register_hmacs(server))
 304     silc_hmac_register_default();
 305
 306   /* Initialize random number generator for the server. */
 307   server->rng = silc_rng_alloc();
 308   silc_rng_init(server->rng);
 309   silc_rng_global_init(server->rng);
 310
 311   /* Initialize hash functions for server to use */
 312   silc_hash_alloc("md5", &server->md5hash);
 313   silc_hash_alloc("sha1", &server->sha1hash);
 314
 315   /* Allocate PKCS context for local public and private keys */
 316   if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
 317     goto err;
 318   silc_pkcs_public_key_set(server->pkcs, server->public_key);
 319   silc_pkcs_private_key_set(server->pkcs, server->private_key);
 320
 321   /* Initialize the scheduler */
 322   server->schedule = silc_schedule_init(server->config->param.connections_max,
 323                                         server);
 324   if (!server->schedule)
 325     goto err;
 326
 327   /* First, register log files configuration for error output */
 328   silc_server_config_setlogfiles(server);
 329
 330   /* Initialize ID caches */
 331   server->local_list->clients =
 332     silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
 333   server->local_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
 334   server->local_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
 335
 336   /* These are allocated for normal server as well as these hold some
 337      global information that the server has fetched from its router. For
 338      router these are used as they are supposed to be used on router. */
 339   server->global_list->clients =
 340     silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
 341   server->global_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
 342   server->global_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
 343
 344   /* Init watcher list */
 345   server->watcher_list =
 346     silc_hash_table_alloc(1, silc_hash_client_id_hash, NULL,
 347                           silc_hash_data_compare, (void *)CLIENTID_HASH_LEN,
 348                           NULL, NULL, TRUE);
 349   if (!server->watcher_list)
 350     goto err;
 351
 352   /* Create a listening server */
 353   if (!silc_server_listen(server,
 354                 server->config->server_info->primary == NULL ? NULL :
 355                         server->config->server_info->primary->server_ip,
 356                 server->config->server_info->primary == NULL ? 0 :
 357                         server->config->server_info->primary->port,
 358                 &sock))
 359     goto err;
 360
 361   /* Set socket to non-blocking mode */
 362   silc_net_set_socket_nonblock(sock);
 363   server->sock = sock;
 364
 365   /* Allocate the entire socket list that is used in server. Eventually
 366      all connections will have entry in this table (it is a table of
 367      pointers to the actual object that is allocated individually
 368      later). */
 369   server->sockets = silc_calloc(server->config->param.connections_max,
 370                                 sizeof(*server->sockets));
 371   if (!server->sockets)
 372     goto err;
 373
 374   /* Add ourselves also to the socket table. The entry allocated above
 375      is sent as argument for fast referencing in the future. */
 376   silc_socket_alloc(sock, SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
 377   server->sockets[sock] = newsocket;
 378   SILC_SET_LISTENER(newsocket);
 379
 380   /* Perform name and address lookups to resolve the listenning address
 381      and port. */
 382   if (!silc_net_check_local_by_sock(sock, &newsocket->hostname,
 383                                     &newsocket->ip)) {
 384     if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
 385         !newsocket->ip) {
 386       SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
 387                       newsocket->hostname ? newsocket->hostname :
 388                       newsocket->ip ? newsocket->ip : ""));
 389       server->stat.conn_failures++;
 390       goto err;
 391     }
 392     if (!newsocket->hostname)
 393       newsocket->hostname = strdup(newsocket->ip);
 394   }
 395   newsocket->port = silc_net_get_local_port(sock);
 396
 397   /* Create a Server ID for the server. */
 398   silc_id_create_server_id(newsocket->ip, newsocket->port, server->rng, &id);
 399   if (!id)
 400     goto err;
 401
 402   server->id = id;
 403   server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
 404   server->id_string_len = silc_id_get_len(id, SILC_ID_SERVER);
 405   server->server_name = server->config->server_info->server_name;
 406   server->config->server_info->server_name = NULL;
 407
 408   /* Add ourselves to the server list. We don't have a router yet
 409      beacuse we haven't established a route yet. It will be done later.
 410      For now, NULL is sent as router. This allocates new entry to
 411      the ID list. */
 412   id_entry =
 413     silc_idlist_add_server(server->local_list, strdup(server->server_name),
 414                            server->server_type, server->id, NULL, NULL);
 415   if (!id_entry) {
 416     SILC_LOG_ERROR(("Could not add ourselves to cache"));
 417     goto err;
 418   }
 419   id_entry->data.status |= SILC_IDLIST_STATUS_REGISTERED;
 420
 421   /* Put the allocated socket pointer also to the entry allocated above
 422      for fast back-referencing to the socket list. */
 423   newsocket->user_data = (void *)id_entry;
 424   id_entry->connection = (void *)newsocket;
 425   server->id_entry = id_entry;
 426
 427   /* Register protocols */
 428   silc_server_protocols_register();
 429
 430   /* Add the first task to the scheduler. This is task that is executed by
 431      timeout. It expires as soon as the caller calls silc_server_run. This
 432      task performs authentication protocol and key exchange with our
 433      primary router. */
 434   silc_schedule_task_add(server->schedule, 0,
 435                          silc_server_connect_to_router,
 436                          (void *)server, 0, 1,
 437                          SILC_TASK_TIMEOUT,
 438                          SILC_TASK_PRI_NORMAL);
 439
 440   /* Add listener task to the scheduler. This task receives new connections
 441      to the server. This task remains on the queue until the end of the
 442      program. */
 443   silc_schedule_task_add(server->schedule, sock,
 444                          silc_server_accept_new_connection,
 445                          (void *)server, 0, 0,
 446                          SILC_TASK_FD,
 447                          SILC_TASK_PRI_NORMAL);
 448
 449   if (silc_server_init_secondary(server) == FALSE)
 450     goto err;
 451
 452   server->listenning = TRUE;
 453
 454   /* If server connections has been configured then we must be router as
 455      normal server cannot have server connections, only router connections. */
 456   if (server->config->servers) {
 457     SilcServerConfigServer *ptr = server->config->servers;
 458
 459     server->server_type = SILC_ROUTER;
 460     while (ptr) {
 461       if (ptr->backup_router) {
 462         server->server_type = SILC_BACKUP_ROUTER;
 463         server->backup_router = TRUE;
 464         server->id_entry->server_type = SILC_BACKUP_ROUTER;
 465         break;
 466       }
 467       ptr = ptr->next;
 468     }
 469   }
 470
 471   /* Register the ID Cache purge task. This periodically purges the ID cache
 472      and removes the expired cache entries. */
 473
 474   /* Clients local list */
 475   server->purge_i = purge = silc_calloc(1, sizeof(*purge));
 476   purge->cache = server->local_list->clients;
 477   purge->timeout = 600;
 478   silc_schedule_task_add(server->schedule, 0, silc_idlist_purge,
 479                          (void *)purge, purge->timeout, 0,
 480                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
 481
 482   /* Clients global list */
 483   server->purge_g = purge = silc_calloc(1, sizeof(*purge));
 484   purge->cache = server->global_list->clients;
 485   purge->timeout = 300;
 486   silc_schedule_task_add(server->schedule, 0, silc_idlist_purge,
 487                          (void *)purge, purge->timeout, 0,
 488                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
 489
 490   /* If we are normal server we'll retrieve network statisticial information
 491      once in a while from the router. */
 492   if (server->server_type != SILC_ROUTER)
 493     silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
 494                            server, 10, 0, SILC_TASK_TIMEOUT,
 495                            SILC_TASK_PRI_LOW);
 496
 497   if (server->server_type == SILC_ROUTER)
 498     server->stat.routers++;
 499
 500   SILC_LOG_DEBUG(("Server initialized"));
 501
 502   /* We are done here, return succesfully */
 503   return TRUE;
 504
 505  err:
 506   silc_server_config_unref(&server->config_ref);
 507   silc_net_close_server(sock);
 508   return FALSE;
 509 }
 510
 511 /* Task callback to close a socket connection after rehash */
 512
 513 SILC_TASK_CALLBACK(silc_server_rehash_close_connection)
 514 {
 515   SilcServer server = context;
 516   SilcSocketConnection sock = server->sockets[fd];
 517
 518   if (!sock)
 519     return;
 520
 521   SILC_LOG_INFO(("Connection %s:%d [%s] is unconfigured",
 522                  sock->hostname, sock->port,
 523                  (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
 524                   sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
 525                   sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
 526                   "Router")));
 527   silc_schedule_task_del_by_context(server->schedule, sock);
 528   silc_server_disconnect_remote(server, sock,
 529                                 SILC_STATUS_ERR_BANNED_FROM_SERVER,
 530                                 "This connection is removed from "
 531                                 "configuration");
 532   if (sock->user_data)
 533     silc_server_free_sock_user_data(server, sock, NULL);
 534 }
 535
 536 /* This function basically reads the config file again and switches the config
 537    object pointed by the server object. After that, we have to fix various
 538    things such as the server_name and the listening ports.
 539    Keep in mind that we no longer have the root privileges at this point. */
 540
 541 bool silc_server_rehash(SilcServer server)
 542 {
 543   SilcServerConfig newconfig;
 544
 545   SILC_LOG_INFO(("Rehashing server"));
 546
 547   /* Reset the logging system */
 548   silc_log_quick = TRUE;
 549   silc_log_flush_all();
 550
 551   /* Start the main rehash phase (read again the config file) */
 552   newconfig = silc_server_config_alloc(server->config_file);
 553   if (!newconfig) {
 554     SILC_LOG_ERROR(("Rehash FAILED."));
 555     return FALSE;
 556   }
 557
 558   /* Reinit scheduler if necessary */
 559   if (newconfig->param.connections_max > server->config->param.connections_max)
 560     if (!silc_schedule_reinit(server->schedule,
 561                               newconfig->param.connections_max))
 562       return FALSE;
 563
 564   /* Fix the server_name field */
 565   if (strcmp(server->server_name, newconfig->server_info->server_name)) {
 566     silc_free(server->server_name);
 567     server->server_name = newconfig->server_info->server_name;
 568     newconfig->server_info->server_name = NULL;
 569
 570     /* Update the idcache list with a fresh pointer */
 571     silc_free(server->id_entry->server_name);
 572     server->id_entry->server_name = strdup(server->server_name);
 573     if (!silc_idcache_del_by_context(server->local_list->servers,
 574                                      server->id_entry))
 575       return FALSE;
 576     if (!silc_idcache_add(server->local_list->servers,
 577                           server->id_entry->server_name,
 578                           server->id_entry->id, server->id_entry, 0, NULL))
 579       return FALSE;
 580   }
 581
 582   /* Set logging */
 583   silc_server_config_setlogfiles(server);
 584
 585   /* Change new key pair if necessary */
 586   if (newconfig->server_info->public_key &&
 587       !silc_pkcs_public_key_compare(server->public_key,
 588                                     newconfig->server_info->public_key)) {
 589     silc_pkcs_public_key_free(server->public_key);
 590     silc_pkcs_private_key_free(server->private_key);
 591     server->public_key = newconfig->server_info->public_key;
 592     server->private_key = newconfig->server_info->private_key;
 593     newconfig->server_info->public_key = NULL;
 594     newconfig->server_info->private_key = NULL;
 595
 596     /* Allocate PKCS context for local public and private keys */
 597     silc_pkcs_free(server->pkcs);
 598     if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
 599       return FALSE;
 600     silc_pkcs_public_key_set(server->pkcs, server->public_key);
 601     silc_pkcs_private_key_set(server->pkcs, server->private_key);
 602   }
 603
 604   /* Check for unconfigured server and router connections and close
 605      connections that were unconfigured. */
 606
 607   if (server->config->routers) {
 608     SilcServerConfigRouter *ptr;
 609     SilcServerConfigRouter *newptr;
 610     bool found;
 611
 612     for (ptr = server->config->routers; ptr; ptr = ptr->next) {
 613       found = FALSE;
 614
 615       /* Check whether new config has this one too */
 616       for (newptr = newconfig->routers; newptr; newptr = newptr->next) {
 617         if (silc_string_compare(newptr->host, ptr->host) &&
 618             newptr->port == ptr->port &&
 619             newptr->initiator == ptr->initiator) {
 620           found = TRUE;
 621           break;
 622         }
 623       }
 624
 625       if (!found && ptr->host) {
 626         /* Remove this connection */
 627         SilcSocketConnection sock;
 628         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_ROUTER,
 629                                                ptr->host, ptr->port);
 630         if (sock && !SILC_IS_LISTENER(sock))
 631           silc_schedule_task_add(server->schedule, sock->sock,
 632                                  silc_server_rehash_close_connection,
 633                                  server, 0, 1, SILC_TASK_TIMEOUT,
 634                                  SILC_TASK_PRI_NORMAL);
 635       }
 636     }
 637   }
 638
 639   if (server->config->servers) {
 640     SilcServerConfigServer *ptr;
 641     SilcServerConfigServer *newptr;
 642     bool found;
 643
 644     for (ptr = server->config->servers; ptr; ptr = ptr->next) {
 645       found = FALSE;
 646
 647       /* Check whether new config has this one too */
 648       for (newptr = newconfig->servers; newptr; newptr = newptr->next) {
 649         if (silc_string_compare(newptr->host, ptr->host)) {
 650           found = TRUE;
 651           break;
 652         }
 653       }
 654
 655       if (!found && ptr->host) {
 656         /* Remove this connection */
 657         SilcSocketConnection sock;
 658         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_SERVER,
 659                                                ptr->host, 0);
 660         if (sock && !SILC_IS_LISTENER(sock))
 661           silc_schedule_task_add(server->schedule, sock->sock,
 662                                  silc_server_rehash_close_connection,
 663                                  server, 0, 1, SILC_TASK_TIMEOUT,
 664                                  SILC_TASK_PRI_NORMAL);
 665       }
 666     }
 667   }
 668
 669   if (server->config->clients) {
 670     SilcServerConfigClient *ptr;
 671     SilcServerConfigClient *newptr;
 672     bool found;
 673
 674     for (ptr = server->config->clients; ptr; ptr = ptr->next) {
 675       found = FALSE;
 676
 677       /* Check whether new config has this one too */
 678       for (newptr = newconfig->clients; newptr; newptr = newptr->next) {
 679         if (silc_string_compare(newptr->host, ptr->host)) {
 680           found = TRUE;
 681           break;
 682         }
 683       }
 684
 685       if (!found && ptr->host) {
 686         /* Remove this connection */
 687         SilcSocketConnection sock;
 688         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_CLIENT,
 689                                                ptr->host, 0);
 690         if (sock)
 691           silc_schedule_task_add(server->schedule, sock->sock,
 692                                  silc_server_rehash_close_connection,
 693                                  server, 0, 1, SILC_TASK_TIMEOUT,
 694                                  SILC_TASK_PRI_NORMAL);
 695       }
 696     }
 697   }
 698
 699   /* Go through all configured routers after rehash */
 700   silc_schedule_task_add(server->schedule, 0,
 701                          silc_server_connect_to_router,
 702                          (void *)server, 0, 1,
 703                          SILC_TASK_TIMEOUT,
 704                          SILC_TASK_PRI_NORMAL);
 705
 706   /* Check whether our router status has changed */
 707   if (newconfig->servers) {
 708     SilcServerConfigServer *ptr = newconfig->servers;
 709
 710     server->server_type = SILC_ROUTER;
 711     while (ptr) {
 712       if (ptr->backup_router) {
 713         server->server_type = SILC_BACKUP_ROUTER;
 714         server->backup_router = TRUE;
 715         server->id_entry->server_type = SILC_BACKUP_ROUTER;
 716         break;
 717       }
 718       ptr = ptr->next;
 719     }
 720   }
 721
 722   /* Our old config is gone now. We'll unreference our reference made in
 723      silc_server_init and then destroy it since we are destroying it
 724      underneath the application (layer which called silc_server_init). */
 725   silc_server_config_unref(&server->config_ref);
 726   silc_server_config_destroy(server->config);
 727
 728   /* Take new config context */
 729   server->config = newconfig;
 730   silc_server_config_ref(&server->config_ref, server->config, server->config);
 731
 732   SILC_LOG_DEBUG(("Server rehashed"));
 733
 734   return TRUE;
 735 }
 736
 737 /* The heart of the server. This runs the scheduler thus runs the server.
 738    When this returns the server has been stopped and the program will
 739    be terminated. */
 740
 741 void silc_server_run(SilcServer server)
 742 {
 743   SILC_LOG_INFO(("SILC Server started"));
 744
 745   /* Start the scheduler, the heart of the SILC server. When this returns
 746      the program will be terminated. */
 747   silc_schedule(server->schedule);
 748 }
 749
 750 /* Stops the SILC server. This function is used to shutdown the server.
 751    This is usually called after the scheduler has returned. After stopping
 752    the server one should call silc_server_free. */
 753
 754 void silc_server_stop(SilcServer server)
 755 {
 756   SILC_LOG_INFO(("SILC Server shutting down"));
 757
 758   if (server->schedule) {
 759     int i;
 760
 761     server->server_shutdown = TRUE;
 762
 763     /* Close all connections */
 764     for (i = 0; i < server->config->param.connections_max; i++) {
 765       if (!server->sockets[i])
 766         continue;
 767       if (!SILC_IS_LISTENER(server->sockets[i])) {
 768         SilcSocketConnection sock = server->sockets[i];
 769         SilcIDListData idata = sock->user_data;
 770
 771         if (idata)
 772           idata->status &= ~SILC_IDLIST_STATUS_DISABLED;
 773
 774         silc_schedule_task_del_by_context(server->schedule,
 775                                           server->sockets[i]);
 776         silc_server_disconnect_remote(server, server->sockets[i],
 777                                       SILC_STATUS_OK,
 778                                       "Server is shutting down");
 779         if (sock->user_data)
 780           silc_server_free_sock_user_data(server, sock,
 781                                           "Server is shutting down");
 782         silc_socket_free(sock);
 783       } else {
 784         silc_socket_free(server->sockets[i]);
 785         server->sockets[i] = NULL;
 786       }
 787     }
 788
 789     /* We are not connected to network anymore */
 790     server->standalone = TRUE;
 791
 792     silc_schedule_stop(server->schedule);
 793     silc_schedule_uninit(server->schedule);
 794     server->schedule = NULL;
 795
 796     silc_free(server->sockets);
 797     server->sockets = NULL;
 798   }
 799
 800   silc_server_protocols_unregister();
 801
 802   SILC_LOG_DEBUG(("Server stopped"));
 803 }
 804
 805 /* Function that is called when the network connection to a router has
 806    been established.  This will continue with the key exchange protocol
 807    with the remote router. */
 808
 809 void silc_server_start_key_exchange(SilcServer server,
 810                                     SilcServerConnection sconn,
 811                                     int sock)
 812 {
 813   SilcSocketConnection newsocket;
 814   SilcProtocol protocol;
 815   SilcServerKEInternalContext *proto_ctx;
 816   SilcServerConfigRouter *conn =
 817     (SilcServerConfigRouter *) sconn->conn.ref_ptr;
 818   void *context;
 819
 820   /* Cancel any possible retry timeouts */
 821   silc_schedule_task_del_by_callback(server->schedule,
 822                                      silc_server_connect_to_router_retry);
 823
 824   /* Set socket options */
 825   silc_net_set_socket_nonblock(sock);
 826   silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
 827
 828   /* Create socket connection for the connection. Even though we
 829      know that we are connecting to a router we will mark the socket
 830      to be unknown connection until we have executed authentication
 831      protocol. */
 832   silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
 833   server->sockets[sock] = newsocket;
 834   newsocket->hostname = strdup(sconn->remote_host);
 835   newsocket->ip = strdup(sconn->remote_host);
 836   newsocket->port = sconn->remote_port;
 837   sconn->sock = newsocket;
 838
 839   /* Allocate internal protocol context. This is sent as context
 840      to the protocol. */
 841   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
 842   proto_ctx->server = (void *)server;
 843   proto_ctx->context = (void *)sconn;
 844   proto_ctx->sock = newsocket;
 845   proto_ctx->rng = server->rng;
 846   proto_ctx->responder = FALSE;
 847
 848   /* Set Key Exchange flags from configuration, but fall back to global
 849      settings too. */
 850   SILC_GET_SKE_FLAGS(conn, proto_ctx);
 851   if (server->config->param.key_exchange_pfs)
 852     proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
 853
 854   /* Perform key exchange protocol. silc_server_connect_to_router_second
 855      will be called after the protocol is finished. */
 856   silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
 857                       &protocol, proto_ctx,
 858                       silc_server_connect_to_router_second);
 859   newsocket->protocol = protocol;
 860
 861   /* Register a timeout task that will be executed if the protocol
 862      is not executed within set limit. */
 863   proto_ctx->timeout_task =
 864     silc_schedule_task_add(server->schedule, sock,
 865                            silc_server_timeout_remote,
 866                            server, server->config->key_exchange_timeout, 0,
 867                            SILC_TASK_TIMEOUT,
 868                            SILC_TASK_PRI_LOW);
 869
 870   /* Register the connection for network input and output. This sets
 871      that scheduler will listen for incoming packets for this connection
 872      and sets that outgoing packets may be sent to this connection as
 873      well. However, this doesn't set the scheduler for outgoing traffic,
 874      it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
 875      later when outgoing data is available. */
 876   context = (void *)server;
 877   SILC_REGISTER_CONNECTION_FOR_IO(sock);
 878
 879   /* Run the protocol */
 880   silc_protocol_execute(protocol, server->schedule, 0, 0);
 881 }
 882
 883 /* Timeout callback that will be called to retry connecting to remote
 884    router. This is used by both normal and router server. This will wait
 885    before retrying the connecting. The timeout is generated by exponential
 886    backoff algorithm. */
 887
 888 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
 889 {
 890   SilcServer server = app_context;
 891   SilcServerConnection sconn = (SilcServerConnection)context;
 892   SilcServerConfigRouter *conn = sconn->conn.ref_ptr;
 893   SilcServerConfigConnParams *param =
 894                 (conn->param ? conn->param : &server->config->param);
 895
 896   /* Don't retry if we are shutting down. */
 897   if (server->server_shutdown) {
 898     silc_server_config_unref(&sconn->conn);
 899     silc_free(sconn->remote_host);
 900     silc_free(sconn->backup_replace_ip);
 901     silc_free(sconn);
 902     return;
 903   }
 904
 905   SILC_LOG_INFO(("Retrying connecting to a router"));
 906
 907   /* Calculate next timeout */
 908   if (sconn->retry_count >= 1) {
 909     sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
 910     if (sconn->retry_timeout > param->reconnect_interval_max)
 911       sconn->retry_timeout = param->reconnect_interval_max;
 912   } else {
 913     sconn->retry_timeout = param->reconnect_interval;
 914   }
 915   sconn->retry_count++;
 916   sconn->retry_timeout = sconn->retry_timeout +
 917     silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
 918
 919   /* If we've reached max retry count, give up. */
 920   if ((sconn->retry_count > param->reconnect_count) &&
 921       !param->reconnect_keep_trying) {
 922     SILC_LOG_ERROR(("Could not connect to router, giving up"));
 923     silc_server_config_unref(&sconn->conn);
 924     silc_free(sconn->remote_host);
 925     silc_free(sconn->backup_replace_ip);
 926     silc_free(sconn);
 927     return;
 928   }
 929
 930   SILC_LOG_DEBUG(("Retrying connecting to a router in %d seconds",
 931                   sconn->retry_timeout));
 932
 933   /* We will lookup a fresh pointer later */
 934   silc_server_config_unref(&sconn->conn);
 935
 936   /* Wait one before retrying */
 937   silc_schedule_task_add(server->schedule, 0, silc_server_connect_router,
 938                          context, sconn->retry_timeout, 0,
 939                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
 940 }
 941
 942 /* Generic routine to use connect to a router. */
 943
 944 SILC_TASK_CALLBACK(silc_server_connect_router)
 945 {
 946   SilcServer server = app_context;
 947   SilcServerConnection sconn = (SilcServerConnection)context;
 948   SilcServerConfigRouter *rconn;
 949   int sock;
 950
 951   /* Don't connect if we are shutting down. */
 952   if (server->server_shutdown) {
 953     silc_free(sconn->remote_host);
 954     silc_free(sconn->backup_replace_ip);
 955     silc_free(sconn);
 956     return;
 957   }
 958
 959   SILC_LOG_INFO(("Connecting to the %s %s on port %d",
 960                  (sconn->backup ? "backup router" : "router"),
 961                  sconn->remote_host, sconn->remote_port));
 962
 963   server->router_connect = time(NULL);
 964   rconn = silc_server_config_find_router_conn(server, sconn->remote_host,
 965                                               sconn->remote_port);
 966   if (!rconn) {
 967     SILC_LOG_INFO(("Unconfigured %s connection %s:%d, cannot connect",
 968                    (sconn->backup ? "backup router" : "router"),
 969                    sconn->remote_host, sconn->remote_port));
 970     silc_free(sconn->remote_host);
 971     silc_free(sconn->backup_replace_ip);
 972     silc_free(sconn);
 973     return;
 974   }
 975   silc_server_config_ref(&sconn->conn, server->config, (void *)rconn);
 976
 977   /* Connect to remote host */
 978   sock = silc_net_create_connection(
 979                  (!server->config->server_info->primary ? NULL :
 980                   server->config->server_info->primary->server_ip),
 981                  sconn->remote_port, sconn->remote_host);
 982   if (sock < 0) {
 983     SILC_LOG_ERROR(("Could not connect to router %s:%d",
 984                     sconn->remote_host, sconn->remote_port));
 985     if (!sconn->no_reconnect)
 986       silc_schedule_task_add(server->schedule, 0,
 987                              silc_server_connect_to_router_retry,
 988                              context, 0, 1, SILC_TASK_TIMEOUT,
 989                              SILC_TASK_PRI_NORMAL);
 990     else {
 991       silc_server_config_unref(&sconn->conn);
 992       silc_free(sconn->remote_host);
 993       silc_free(sconn->backup_replace_ip);
 994       silc_free(sconn);
 995     }
 996     return;
 997   }
 998
 999   /* Continue with key exchange protocol */
1000   silc_server_start_key_exchange(server, sconn, sock);
1001 }
1002
1003 /* This function connects to our primary router or if we are a router this
1004    establishes all our primary routes. This is called at the start of the
1005    server to do authentication and key exchange with our router - called
1006    from schedule. */
1007
1008 SILC_TASK_CALLBACK(silc_server_connect_to_router)
1009 {
1010   SilcServer server = (SilcServer)context;
1011   SilcServerConnection sconn;
1012   SilcServerConfigRouter *ptr;
1013
1014   /* Don't connect if we are shutting down. */
1015   if (server->server_shutdown)
1016     return;
1017
1018   SILC_LOG_DEBUG(("We are %s",
1019                   (server->server_type == SILC_SERVER ?
1020                    "normal server" : server->server_type == SILC_ROUTER ?
1021                    "router" : "backup router/normal server")));
1022
1023   if (!server->config->routers) {
1024     /* There wasn't a configured router, we will continue but we don't
1025        have a connection to outside world.  We will be standalone server. */
1026     SILC_LOG_DEBUG(("No router(s), we are standalone"));
1027     server->standalone = TRUE;
1028     return;
1029   }
1030
1031   /* Cancel any possible retry timeouts */
1032   silc_schedule_task_del_by_callback(server->schedule,
1033                                      silc_server_connect_router);
1034   silc_schedule_task_del_by_callback(server->schedule,
1035                                      silc_server_connect_to_router_retry);
1036
1037   /* Create the connections to all our routes */
1038   for (ptr = server->config->routers; ptr; ptr = ptr->next) {
1039
1040     SILC_LOG_DEBUG(("%s connection [%s] %s:%d",
1041                     ptr->backup_router ? "Backup router" : "Router",
1042                     ptr->initiator ? "Initiator" : "Responder",
1043                     ptr->host, ptr->port));
1044
1045     if (server->server_type == SILC_ROUTER && ptr->backup_router &&
1046         ptr->initiator == FALSE && !server->backup_router &&
1047         !silc_server_config_get_backup_router(server))
1048       server->wait_backup = TRUE;
1049
1050     if (ptr->initiator) {
1051       /* Check whether we are connected to this host already */
1052       if (silc_server_num_sockets_by_remote(server,
1053                                             silc_net_is_ip(ptr->host) ?
1054                                             ptr->host : NULL,
1055                                             silc_net_is_ip(ptr->host) ?
1056                                             NULL : ptr->host, ptr->port,
1057                                             SILC_SOCKET_TYPE_ROUTER)) {
1058         SILC_LOG_DEBUG(("We are already connected to this router"));
1059         continue;
1060       }
1061
1062       /* Allocate connection object for hold connection specific stuff. */
1063       sconn = silc_calloc(1, sizeof(*sconn));
1064       sconn->remote_host = strdup(ptr->host);
1065       sconn->remote_port = ptr->port;
1066       sconn->backup = ptr->backup_router;
1067       if (sconn->backup) {
1068         sconn->backup_replace_ip = strdup(ptr->backup_replace_ip);
1069         sconn->backup_replace_port = ptr->backup_replace_port;
1070       }
1071
1072       if (!server->router_conn && !sconn->backup)
1073         server->router_conn = sconn;
1074
1075       silc_schedule_task_add(server->schedule, 0,
1076                              silc_server_connect_router,
1077                              (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
1078                              SILC_TASK_PRI_NORMAL);
1079     }
1080   }
1081 }
1082
1083 /* Second part of connecting to router(s). Key exchange protocol has been
1084    executed and now we will execute authentication protocol. */
1085
1086 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
1087 {
1088   SilcProtocol protocol = (SilcProtocol)context;
1089   SilcServerKEInternalContext *ctx =
1090     (SilcServerKEInternalContext *)protocol->context;
1091   SilcServer server = (SilcServer)ctx->server;
1092   SilcServerConnection sconn = (SilcServerConnection)ctx->context;
1093   SilcSocketConnection sock = ctx->sock;
1094   SilcServerConnAuthInternalContext *proto_ctx;
1095   SilcServerConfigRouter *conn = NULL;
1096
1097   SILC_LOG_DEBUG(("Start"));
1098
1099   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1100       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1101     /* Error occured during protocol */
1102     silc_protocol_free(protocol);
1103     sock->protocol = NULL;
1104     silc_ske_free_key_material(ctx->keymat);
1105     if (ctx->packet)
1106       silc_packet_context_free(ctx->packet);
1107     if (ctx->ske)
1108       silc_ske_free(ctx->ske);
1109     silc_free(ctx->dest_id);
1110     silc_free(ctx);
1111     silc_schedule_task_del_by_callback(server->schedule,
1112                                        silc_server_failure_callback);
1113     silc_server_disconnect_remote(server, sock,
1114                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1115
1116     /* Try reconnecting if configuration wants it */
1117     if (!sconn->no_reconnect) {
1118       silc_schedule_task_add(server->schedule, 0,
1119                              silc_server_connect_to_router_retry,
1120                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1121                              SILC_TASK_PRI_NORMAL);
1122       return;
1123     }
1124
1125     /* Call completion to indicate error */
1126     if (sconn->callback)
1127       (*sconn->callback)(server, NULL, sconn->callback_context);
1128
1129     silc_server_config_unref(&sconn->conn);
1130     silc_free(sconn->remote_host);
1131     silc_free(sconn->backup_replace_ip);
1132     silc_free(sconn);
1133     return;
1134   }
1135
1136   /* We now have the key material as the result of the key exchange
1137      protocol. Take the key material into use. Free the raw key material
1138      as soon as we've set them into use. */
1139   if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1140                                         ctx->sock, ctx->keymat,
1141                                         ctx->ske->prop->cipher,
1142                                         ctx->ske->prop->pkcs,
1143                                         ctx->ske->prop->hash,
1144                                         ctx->ske->prop->hmac,
1145                                         ctx->ske->prop->group,
1146                                         ctx->responder)) {
1147     silc_protocol_free(protocol);
1148     sock->protocol = NULL;
1149     silc_ske_free_key_material(ctx->keymat);
1150     if (ctx->packet)
1151       silc_packet_context_free(ctx->packet);
1152     if (ctx->ske)
1153       silc_ske_free(ctx->ske);
1154     silc_free(ctx->dest_id);
1155     silc_free(ctx);
1156     silc_schedule_task_del_by_callback(server->schedule,
1157                                        silc_server_failure_callback);
1158     silc_server_disconnect_remote(server, sock,
1159                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1160
1161     /* Try reconnecting if configuration wants it */
1162     if (!sconn->no_reconnect) {
1163       silc_schedule_task_add(server->schedule, 0,
1164                              silc_server_connect_to_router_retry,
1165                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1166                              SILC_TASK_PRI_NORMAL);
1167       return;
1168     }
1169
1170     /* Call completion to indicate error */
1171     if (sconn->callback)
1172       (*sconn->callback)(server, NULL, sconn->callback_context);
1173
1174     silc_server_config_unref(&sconn->conn);
1175     silc_free(sconn->remote_host);
1176     silc_free(sconn->backup_replace_ip);
1177     silc_free(sconn);
1178     return;
1179   }
1180   silc_ske_free_key_material(ctx->keymat);
1181
1182   /* Allocate internal context for the authentication protocol. This
1183      is sent as context for the protocol. */
1184   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1185   proto_ctx->server = (void *)server;
1186   proto_ctx->context = (void *)sconn;
1187   proto_ctx->sock = sock;
1188   proto_ctx->ske = ctx->ske;       /* Save SKE object from previous protocol */
1189   proto_ctx->dest_id_type = ctx->dest_id_type;
1190   proto_ctx->dest_id = ctx->dest_id;
1191
1192   /* Resolve the authentication method used in this connection. Check if
1193      we find a match from user configured connections */
1194   if (!sconn->conn.ref_ptr)
1195     conn = silc_server_config_find_router_conn(server, sock->hostname,
1196                                                sock->port);
1197   else
1198     conn = sconn->conn.ref_ptr;
1199
1200   if (conn) {
1201     /* Match found. Use the configured authentication method. Take only
1202        the passphrase, since for public key auth we automatically use
1203        our local key pair. */
1204     if (conn->passphrase) {
1205       if (conn->publickeys && !server->config->prefer_passphrase_auth) {
1206         proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
1207       } else {
1208         proto_ctx->auth_data = strdup(conn->passphrase);
1209         proto_ctx->auth_data_len = strlen(conn->passphrase);
1210         proto_ctx->auth_meth = SILC_AUTH_PASSWORD;
1211       }
1212     } else if (conn->publickeys) {
1213       proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
1214     } else {
1215       proto_ctx->auth_meth = SILC_AUTH_NONE;
1216     }
1217   } else {
1218     SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
1219                     sock->hostname, sock->ip, sock->port));
1220     silc_protocol_free(protocol);
1221     sock->protocol = NULL;
1222     if (ctx->packet)
1223       silc_packet_context_free(ctx->packet);
1224     if (ctx->ske)
1225       silc_ske_free(ctx->ske);
1226     silc_free(ctx->dest_id);
1227     silc_free(ctx);
1228     silc_server_config_unref(&sconn->conn);
1229     silc_free(sconn->remote_host);
1230     silc_free(sconn->backup_replace_ip);
1231     silc_free(sconn);
1232     silc_schedule_task_del_by_callback(server->schedule,
1233                                        silc_server_failure_callback);
1234     silc_server_disconnect_remote(server, sock,
1235                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1236     return;
1237   }
1238
1239   /* Free old protocol as it is finished now */
1240   silc_protocol_free(protocol);
1241   if (ctx->packet)
1242     silc_packet_context_free(ctx->packet);
1243   silc_free(ctx);
1244   sock->protocol = NULL;
1245
1246   /* Allocate the authentication protocol. This is allocated here
1247      but we won't start it yet. We will be receiving party of this
1248      protocol thus we will wait that connecting party will make
1249      their first move. */
1250   silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1251                       &sock->protocol, proto_ctx,
1252                       silc_server_connect_to_router_final);
1253
1254   /* Register timeout task. If the protocol is not executed inside
1255      this timelimit the connection will be terminated. */
1256   proto_ctx->timeout_task =
1257     silc_schedule_task_add(server->schedule, sock->sock,
1258                            silc_server_timeout_remote,
1259                            (void *)server,
1260                            server->config->conn_auth_timeout, 0,
1261                            SILC_TASK_TIMEOUT,
1262                            SILC_TASK_PRI_LOW);
1263
1264   /* Run the protocol */
1265   silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
1266 }
1267
1268 /* Finalizes the connection to router. Registers a server task to the
1269    queue so that we can accept new connections. */
1270
1271 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
1272 {
1273   SilcProtocol protocol = (SilcProtocol)context;
1274   SilcServerConnAuthInternalContext *ctx =
1275     (SilcServerConnAuthInternalContext *)protocol->context;
1276   SilcServer server = (SilcServer)ctx->server;
1277   SilcServerConnection sconn = (SilcServerConnection)ctx->context;
1278   SilcSocketConnection sock = ctx->sock;
1279   SilcServerEntry id_entry = NULL;
1280   SilcBuffer packet;
1281   unsigned char *id_string;
1282   SilcUInt32 id_len;
1283   SilcIDListData idata;
1284   SilcServerConfigRouter *conn = NULL;
1285   SilcServerConfigConnParams *param = NULL;
1286
1287   SILC_LOG_DEBUG(("Start"));
1288
1289   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1290       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1291     /* Error occured during protocol */
1292     silc_free(ctx->dest_id);
1293     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1294                                   NULL);
1295
1296     /* Try reconnecting if configuration wants it */
1297     if (!sconn->no_reconnect) {
1298       silc_schedule_task_add(server->schedule, 0,
1299                              silc_server_connect_to_router_retry,
1300                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1301                              SILC_TASK_PRI_NORMAL);
1302       goto out2;
1303     }
1304
1305     goto out;
1306   }
1307
1308   /* Add a task to the queue. This task receives new connections to the
1309      server. This task remains on the queue until the end of the program. */
1310   if (!server->listenning && !sconn->backup) {
1311     silc_schedule_task_add(server->schedule, server->sock,
1312                            silc_server_accept_new_connection,
1313                            (void *)server, 0, 0,
1314                            SILC_TASK_FD,
1315                            SILC_TASK_PRI_NORMAL);
1316     server->listenning = TRUE;
1317   }
1318
1319   /* Send NEW_SERVER packet to the router. We will become registered
1320      to the SILC network after sending this packet. */
1321   id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
1322   id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
1323   packet = silc_buffer_alloc(2 + 2 + id_len + strlen(server->server_name));
1324   silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
1325   silc_buffer_format(packet,
1326                      SILC_STR_UI_SHORT(id_len),
1327                      SILC_STR_UI_XNSTRING(id_string, id_len),
1328                      SILC_STR_UI_SHORT(strlen(server->server_name)),
1329                      SILC_STR_UI_XNSTRING(server->server_name,
1330                                           strlen(server->server_name)),
1331                      SILC_STR_END);
1332
1333   /* Send the packet */
1334   silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
1335                           packet->data, packet->len, TRUE);
1336   silc_buffer_free(packet);
1337   silc_free(id_string);
1338
1339   SILC_LOG_INFO(("Connected to router %s", sock->hostname));
1340
1341   /* Check that we do not have this ID already */
1342   id_entry = silc_idlist_find_server_by_id(server->local_list,
1343                                            ctx->dest_id, TRUE, NULL);
1344   if (id_entry) {
1345     silc_idcache_del_by_context(server->local_list->servers, id_entry);
1346   } else {
1347     id_entry = silc_idlist_find_server_by_id(server->global_list,
1348                                              ctx->dest_id, TRUE, NULL);
1349     if (id_entry)
1350       silc_idcache_del_by_context(server->global_list->servers, id_entry);
1351   }
1352
1353   SILC_LOG_DEBUG(("New server id(%s)",
1354                   silc_id_render(ctx->dest_id, SILC_ID_SERVER)));
1355
1356   /* Add the connected router to global server list.  Router is sent
1357      as NULL since it's local to us. */
1358   id_entry = silc_idlist_add_server(server->global_list,
1359                                     strdup(sock->hostname),
1360                                     SILC_ROUTER, ctx->dest_id, NULL, sock);
1361   if (!id_entry) {
1362     silc_free(ctx->dest_id);
1363     SILC_LOG_ERROR(("Cannot add new server entry to cache"));
1364     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1365                                   NULL);
1366     goto out;
1367   }
1368
1369   silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1370   silc_free(sock->user_data);
1371   sock->user_data = (void *)id_entry;
1372   sock->type = SILC_SOCKET_TYPE_ROUTER;
1373   idata = (SilcIDListData)sock->user_data;
1374   idata->status |= (SILC_IDLIST_STATUS_REGISTERED |
1375                     SILC_IDLIST_STATUS_LOCAL);
1376
1377   conn = sconn->conn.ref_ptr;
1378   param = &server->config->param;
1379   if (conn && conn->param)
1380     param = conn->param;
1381
1382   /* Perform keepalive. */
1383   silc_socket_set_heartbeat(sock, param->keepalive_secs, server,
1384                             silc_server_perform_heartbeat,
1385                             server->schedule);
1386
1387   /* Register re-key timeout */
1388   idata->rekey->timeout = param->key_exchange_rekey;
1389   silc_schedule_task_add(server->schedule, sock->sock,
1390                          silc_server_rekey_callback,
1391                          (void *)sock, idata->rekey->timeout, 0,
1392                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1393
1394   if (!sconn->backup) {
1395     /* Mark this router our primary router if we're still standalone */
1396     if (server->standalone) {
1397       SILC_LOG_DEBUG(("This connection is our primary router"));
1398       server->id_entry->router = id_entry;
1399       server->router = id_entry;
1400       server->standalone = FALSE;
1401
1402       /* If we are router then announce our possible servers.  Backup
1403          router announces also global servers. */
1404       if (server->server_type == SILC_ROUTER)
1405         silc_server_announce_servers(server,
1406                                      server->backup_router ? TRUE : FALSE,
1407                                      0, SILC_PRIMARY_ROUTE(server));
1408
1409       /* Announce our clients and channels to the router */
1410       silc_server_announce_clients(server, 0, SILC_PRIMARY_ROUTE(server));
1411       silc_server_announce_channels(server, 0, SILC_PRIMARY_ROUTE(server));
1412
1413       /* If we are backup router then this primary router is whom we are
1414          backing up. */
1415       if (server->server_type == SILC_BACKUP_ROUTER)
1416         silc_server_backup_add(server, server->id_entry, sock->ip,
1417                                sconn->remote_port, TRUE);
1418     }
1419   } else {
1420     /* Add this server to be our backup router */
1421     silc_server_backup_add(server, id_entry, sconn->backup_replace_ip,
1422                            sconn->backup_replace_port, FALSE);
1423   }
1424
1425   sock->protocol = NULL;
1426
1427  out:
1428   /* Call the completion callback to indicate that we've connected to
1429      the router */
1430   if (sconn && sconn->callback)
1431     (*sconn->callback)(server, id_entry, sconn->callback_context);
1432
1433   /* Free the temporary connection data context */
1434   if (sconn) {
1435     silc_server_config_unref(&sconn->conn);
1436     silc_free(sconn->remote_host);
1437     silc_free(sconn->backup_replace_ip);
1438     silc_free(sconn);
1439   }
1440   if (sconn == server->router_conn)
1441     server->router_conn = NULL;
1442
1443  out2:
1444   /* Free the protocol object */
1445   if (sock->protocol == protocol)
1446     sock->protocol = NULL;
1447   silc_protocol_free(protocol);
1448   if (ctx->packet)
1449     silc_packet_context_free(ctx->packet);
1450   if (ctx->ske)
1451     silc_ske_free(ctx->ske);
1452   if (ctx->auth_meth == SILC_AUTH_PASSWORD)
1453     silc_free(ctx->auth_data);
1454   silc_free(ctx);
1455 }
1456
1457 /* Host lookup callback that is called after the incoming connection's
1458    IP and FQDN lookup is performed. This will actually check the acceptance
1459    of the incoming connection and will register the key exchange protocol
1460    for this connection. */
1461
1462 static void
1463 silc_server_accept_new_connection_lookup(SilcSocketConnection sock,
1464                                          void *context)
1465 {
1466   SilcServerKEInternalContext *proto_ctx =
1467     (SilcServerKEInternalContext *)context;
1468   SilcServer server = (SilcServer)proto_ctx->server;
1469   SilcServerConfigClient *cconfig = NULL;
1470   SilcServerConfigServer *sconfig = NULL;
1471   SilcServerConfigRouter *rconfig = NULL;
1472   SilcServerConfigDeny *deny;
1473   int port;
1474
1475   /* Check whether we could resolve both IP and FQDN. */
1476   if (!sock->ip || (!strcmp(sock->ip, sock->hostname) &&
1477                     server->config->require_reverse_lookup)) {
1478     SILC_LOG_ERROR(("IP/DNS lookup failed %s",
1479                     sock->hostname ? sock->hostname :
1480                     sock->ip ? sock->ip : ""));
1481     server->stat.conn_failures++;
1482     silc_server_disconnect_remote(server, sock,
1483                                   SILC_STATUS_ERR_INCOMPLETE_INFORMATION,
1484                                   "Unknown host or IP");
1485     silc_free(proto_ctx);
1486     return;
1487   }
1488
1489   /* Register the connection for network input and output. This sets
1490      that scheduler will listen for incoming packets for this connection
1491      and sets that outgoing packets may be sent to this connection as well.
1492      However, this doesn't set the scheduler for outgoing traffic, it
1493      will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1494      later when outgoing data is available. */
1495   context = (void *)server;
1496   SILC_REGISTER_CONNECTION_FOR_IO(sock->sock);
1497
1498   SILC_LOG_INFO(("Incoming connection %s (%s)", sock->hostname,
1499                  sock->ip));
1500
1501   /* Listenning port */
1502   if (!server->sockets[(SilcUInt32)proto_ctx->context]) {
1503     silc_server_disconnect_remote(server, sock,
1504                                   SILC_STATUS_ERR_RESOURCE_LIMIT,
1505                                   "Connection refused");
1506     server->stat.conn_failures++;
1507     silc_free(proto_ctx);
1508     return;
1509   }
1510   port = server->sockets[(SilcUInt32)proto_ctx->context]->port;
1511
1512   /* Check whether this connection is denied to connect to us. */
1513   deny = silc_server_config_find_denied(server, sock->ip);
1514   if (!deny)
1515     deny = silc_server_config_find_denied(server, sock->hostname);
1516   if (deny) {
1517     /* The connection is denied */
1518     SILC_LOG_INFO(("Connection %s (%s) is denied",
1519                    sock->hostname, sock->ip));
1520     silc_server_disconnect_remote(server, sock,
1521                                   SILC_STATUS_ERR_BANNED_FROM_SERVER,
1522                                   deny->reason);
1523     server->stat.conn_failures++;
1524     silc_free(proto_ctx);
1525     return;
1526   }
1527
1528   /* Check whether we have configured this sort of connection at all. We
1529      have to check all configurations since we don't know what type of
1530      connection this is. */
1531   if (!(cconfig = silc_server_config_find_client(server, sock->ip)))
1532     cconfig = silc_server_config_find_client(server, sock->hostname);
1533   if (!(sconfig = silc_server_config_find_server_conn(server, sock->ip)))
1534     sconfig = silc_server_config_find_server_conn(server, sock->hostname);
1535   if (server->server_type == SILC_ROUTER) {
1536     if (!(rconfig = silc_server_config_find_router_conn(server,
1537                                                         sock->ip, sock->port)))
1538       rconfig = silc_server_config_find_router_conn(server, sock->hostname,
1539                                                     sock->port);
1540   }
1541   if (!cconfig && !sconfig && !rconfig) {
1542     SILC_LOG_INFO(("Connection %s (%s) is not allowed", sock->hostname,
1543                    sock->ip));
1544     silc_server_disconnect_remote(server, sock,
1545                                   SILC_STATUS_ERR_BANNED_FROM_SERVER, NULL);
1546     server->stat.conn_failures++;
1547     silc_free(proto_ctx);
1548     return;
1549   }
1550
1551   /* The connection is allowed */
1552
1553   /* Set internal context for key exchange protocol. This is
1554      sent as context for the protocol. */
1555   proto_ctx->sock = sock;
1556   proto_ctx->rng = server->rng;
1557   proto_ctx->responder = TRUE;
1558   silc_server_config_ref(&proto_ctx->cconfig, server->config, cconfig);
1559   silc_server_config_ref(&proto_ctx->sconfig, server->config, sconfig);
1560   silc_server_config_ref(&proto_ctx->rconfig, server->config, rconfig);
1561
1562   /* Take flags for key exchange. Since we do not know what type of connection
1563      this is, we go through all found configurations and use the global ones
1564      as well. This will result always into strictest key exchange flags. */
1565   SILC_GET_SKE_FLAGS(cconfig, proto_ctx);
1566   SILC_GET_SKE_FLAGS(sconfig, proto_ctx);
1567   SILC_GET_SKE_FLAGS(rconfig, proto_ctx);
1568   if (server->config->param.key_exchange_pfs)
1569     proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
1570
1571   /* Prepare the connection for key exchange protocol. We allocate the
1572      protocol but will not start it yet. The connector will be the
1573      initiator of the protocol thus we will wait for initiation from
1574      there before we start the protocol. */
1575   server->stat.auth_attempts++;
1576   SILC_LOG_DEBUG(("Starting key exchange protocol"));
1577   silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1578                       &sock->protocol, proto_ctx,
1579                       silc_server_accept_new_connection_second);
1580
1581   /* Register a timeout task that will be executed if the connector
1582      will not start the key exchange protocol within specified timeout
1583      and the connection will be closed. */
1584   proto_ctx->timeout_task =
1585     silc_schedule_task_add(server->schedule, sock->sock,
1586                            silc_server_timeout_remote,
1587                            (void *)server,
1588                            server->config->key_exchange_timeout, 0,
1589                            SILC_TASK_TIMEOUT,
1590                            SILC_TASK_PRI_LOW);
1591 }
1592
1593 /* Accepts new connections to the server. Accepting new connections are
1594    done in three parts to make it async. */
1595
1596 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
1597 {
1598   SilcServer server = (SilcServer)context;
1599   SilcSocketConnection newsocket;
1600   SilcServerKEInternalContext *proto_ctx;
1601   int sock;
1602
1603   SILC_LOG_DEBUG(("Accepting new connection"));
1604
1605   server->stat.conn_attempts++;
1606
1607   sock = silc_net_accept_connection(fd);
1608   if (sock < 0) {
1609     SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
1610     server->stat.conn_failures++;
1611     return;
1612   }
1613
1614   /* Check for maximum allowed connections */
1615   if (sock > server->config->param.connections_max) {
1616     SILC_LOG_ERROR(("Refusing connection, server is full"));
1617     server->stat.conn_failures++;
1618     silc_net_close_connection(sock);
1619     return;
1620   }
1621
1622   /* Set socket options */
1623   silc_net_set_socket_nonblock(sock);
1624   silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
1625
1626   /* We don't create a ID yet, since we don't know what type of connection
1627      this is yet. But, we do add the connection to the socket table. */
1628   silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
1629   server->sockets[sock] = newsocket;
1630
1631   /* Perform asynchronous host lookup. This will lookup the IP and the
1632      FQDN of the remote connection. After the lookup is done the connection
1633      is accepted further. */
1634   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1635   proto_ctx->server = server;
1636   proto_ctx->context = (void *)fd;
1637   silc_socket_host_lookup(newsocket, TRUE,
1638                           silc_server_accept_new_connection_lookup,
1639                           (void *)proto_ctx, server->schedule);
1640 }
1641
1642 /* Second part of accepting new connection. Key exchange protocol has been
1643    performed and now it is time to do little connection authentication
1644    protocol to figure out whether this connection is client or server
1645    and whether it has right to access this server (especially server
1646    connections needs to be authenticated). */
1647
1648 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1649 {
1650   SilcProtocol protocol = (SilcProtocol)context;
1651   SilcServerKEInternalContext *ctx =
1652     (SilcServerKEInternalContext *)protocol->context;
1653   SilcServer server = (SilcServer)ctx->server;
1654   SilcSocketConnection sock = ctx->sock;
1655   SilcServerConnAuthInternalContext *proto_ctx;
1656
1657   SILC_LOG_DEBUG(("Start"));
1658
1659   if ((protocol->state == SILC_PROTOCOL_STATE_ERROR) ||
1660       (protocol->state == SILC_PROTOCOL_STATE_FAILURE)) {
1661     /* Error occured during protocol */
1662     SILC_LOG_DEBUG(("Error key exchange protocol"));
1663     silc_protocol_free(protocol);
1664     sock->protocol = NULL;
1665     silc_ske_free_key_material(ctx->keymat);
1666     if (ctx->packet)
1667       silc_packet_context_free(ctx->packet);
1668     if (ctx->ske)
1669       silc_ske_free(ctx->ske);
1670     silc_free(ctx->dest_id);
1671     silc_server_config_unref(&ctx->cconfig);
1672     silc_server_config_unref(&ctx->sconfig);
1673     silc_server_config_unref(&ctx->rconfig);
1674     silc_free(ctx);
1675     silc_schedule_task_del_by_callback(server->schedule,
1676                                        silc_server_failure_callback);
1677     silc_server_disconnect_remote(server, sock,
1678                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
1679                                   NULL);
1680     server->stat.auth_failures++;
1681     return;
1682   }
1683
1684   /* We now have the key material as the result of the key exchange
1685      protocol. Take the key material into use. Free the raw key material
1686      as soon as we've set them into use. */
1687   if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1688                                         ctx->sock, ctx->keymat,
1689                                         ctx->ske->prop->cipher,
1690                                         ctx->ske->prop->pkcs,
1691                                         ctx->ske->prop->hash,
1692                                         ctx->ske->prop->hmac,
1693                                         ctx->ske->prop->group,
1694                                         ctx->responder)) {
1695     SILC_LOG_ERROR(("Error setting key material in use"));
1696     silc_protocol_free(protocol);
1697     sock->protocol = NULL;
1698     silc_ske_free_key_material(ctx->keymat);
1699     if (ctx->packet)
1700       silc_packet_context_free(ctx->packet);
1701     if (ctx->ske)
1702       silc_ske_free(ctx->ske);
1703     silc_free(ctx->dest_id);
1704     silc_server_config_unref(&ctx->cconfig);
1705     silc_server_config_unref(&ctx->sconfig);
1706     silc_server_config_unref(&ctx->rconfig);
1707     silc_free(ctx);
1708     silc_schedule_task_del_by_callback(server->schedule,
1709                                        silc_server_failure_callback);
1710     silc_server_disconnect_remote(server, sock,
1711                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1712     server->stat.auth_failures++;
1713     return;
1714   }
1715   silc_ske_free_key_material(ctx->keymat);
1716
1717   /* Allocate internal context for the authentication protocol. This
1718      is sent as context for the protocol. */
1719   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1720   proto_ctx->server = (void *)server;
1721   proto_ctx->sock = sock;
1722   proto_ctx->ske = ctx->ske;    /* Save SKE object from previous protocol */
1723   proto_ctx->responder = TRUE;
1724   proto_ctx->dest_id_type = ctx->dest_id_type;
1725   proto_ctx->dest_id = ctx->dest_id;
1726   proto_ctx->cconfig = ctx->cconfig;
1727   proto_ctx->sconfig = ctx->sconfig;
1728   proto_ctx->rconfig = ctx->rconfig;
1729
1730   /* Free old protocol as it is finished now */
1731   silc_protocol_free(protocol);
1732   if (ctx->packet)
1733     silc_packet_context_free(ctx->packet);
1734   silc_free(ctx);
1735   sock->protocol = NULL;
1736
1737   /* Allocate the authentication protocol. This is allocated here
1738      but we won't start it yet. We will be receiving party of this
1739      protocol thus we will wait that connecting party will make
1740      their first move. */
1741   SILC_LOG_DEBUG(("Starting connection authentication protocol"));
1742   silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1743                       &sock->protocol, proto_ctx,
1744                       silc_server_accept_new_connection_final);
1745
1746   /* Register timeout task. If the protocol is not executed inside
1747      this timelimit the connection will be terminated. */
1748   proto_ctx->timeout_task =
1749     silc_schedule_task_add(server->schedule, sock->sock,
1750                            silc_server_timeout_remote,
1751                            (void *)server,
1752                            server->config->conn_auth_timeout, 0,
1753                            SILC_TASK_TIMEOUT,
1754                            SILC_TASK_PRI_LOW);
1755 }
1756
1757 /* After this is called, server don't wait for backup router anymore.
1758    This gets called automatically even after we have backup router
1759    connection established. */
1760
1761 SILC_TASK_CALLBACK(silc_server_backup_router_wait)
1762 {
1763   SilcServer server = context;
1764   server->wait_backup = FALSE;
1765 }
1766
1767 /* Final part of accepting new connection. The connection has now
1768    been authenticated and keys has been exchanged. We also know whether
1769    this is client or server connection. */
1770
1771 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1772 {
1773   SilcProtocol protocol = (SilcProtocol)context;
1774   SilcServerConnAuthInternalContext *ctx =
1775     (SilcServerConnAuthInternalContext *)protocol->context;
1776   SilcServer server = (SilcServer)ctx->server;
1777   SilcSocketConnection sock = ctx->sock;
1778   SilcUnknownEntry entry = (SilcUnknownEntry)sock->user_data;
1779   void *id_entry;
1780   SilcServerConfigConnParams *param = &server->config->param;
1781
1782   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1783       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1784     /* Error occured during protocol */
1785     SILC_LOG_DEBUG(("Error during authentication protocol"));
1786     silc_protocol_free(protocol);
1787     sock->protocol = NULL;
1788     if (ctx->packet)
1789       silc_packet_context_free(ctx->packet);
1790     if (ctx->ske)
1791       silc_ske_free(ctx->ske);
1792     silc_free(ctx->dest_id);
1793     silc_server_config_unref(&ctx->cconfig);
1794     silc_server_config_unref(&ctx->sconfig);
1795     silc_server_config_unref(&ctx->rconfig);
1796     silc_free(ctx);
1797     silc_schedule_task_del_by_callback(server->schedule,
1798                                        silc_server_failure_callback);
1799     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1800                                   NULL);
1801     server->stat.auth_failures++;
1802     return;
1803   }
1804
1805   entry->data.last_receive = time(NULL);
1806
1807   switch (ctx->conn_type) {
1808   case SILC_SOCKET_TYPE_CLIENT:
1809     {
1810       SilcClientEntry client;
1811       SilcServerConfigClient *conn = ctx->cconfig.ref_ptr;
1812
1813       /* Verify whether this connection is after all allowed to connect */
1814       if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1815                                           &server->config->param,
1816                                           conn->param, ctx->ske)) {
1817         server->stat.auth_failures++;
1818         goto out;
1819       }
1820
1821       /* If we are primary router and we have backup router configured
1822          but it has not connected to use yet, do not accept any other
1823          connection. */
1824       if (server->wait_backup && server->server_type == SILC_ROUTER &&
1825           !server->backup_router) {
1826         SilcServerConfigRouter *router;
1827         router = silc_server_config_get_backup_router(server);
1828         if (router && strcmp(server->config->server_info->primary->server_ip,
1829                              sock->ip) &&
1830             silc_server_find_socket_by_host(server,
1831                                             SILC_SOCKET_TYPE_SERVER,
1832                                             router->backup_replace_ip, 0)) {
1833           SILC_LOG_INFO(("Will not accept connections because we do "
1834                          "not have backup router connection established"));
1835           silc_server_disconnect_remote(server, sock,
1836                                         SILC_STATUS_ERR_PERM_DENIED,
1837                                         "We do not have connection to backup "
1838                                         "router established, try later");
1839           silc_free(sock->user_data);
1840           server->stat.auth_failures++;
1841
1842           /* From here on, wait 10 seconds for the backup router to appear. */
1843           silc_schedule_task_add(server->schedule, 0,
1844                                  silc_server_backup_router_wait,
1845                                  (void *)server, 10, 0,
1846                                  SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1847           goto out;
1848         }
1849       }
1850
1851       SILC_LOG_DEBUG(("Remote host is client"));
1852       SILC_LOG_INFO(("Connection %s (%s) is client", sock->hostname,
1853                      sock->ip));
1854
1855       /* Add the client to the client ID cache. The nickname and Client ID
1856          and other information is created after we have received NEW_CLIENT
1857          packet from client. */
1858       client = silc_idlist_add_client(server->local_list,
1859                                       NULL, NULL, NULL, NULL, NULL, sock, 0);
1860       if (!client) {
1861         SILC_LOG_ERROR(("Could not add new client to cache"));
1862         silc_free(sock->user_data);
1863         silc_server_disconnect_remote(server, sock,
1864                                       SILC_STATUS_ERR_AUTH_FAILED, NULL);
1865         server->stat.auth_failures++;
1866         goto out;
1867       }
1868       entry->data.status |= SILC_IDLIST_STATUS_LOCAL;
1869
1870       /* Statistics */
1871       server->stat.my_clients++;
1872       server->stat.clients++;
1873       server->stat.cell_clients++;
1874
1875       /* Get connection parameters */
1876       if (conn->param) {
1877         param = conn->param;
1878
1879         if (!param->keepalive_secs)
1880           param->keepalive_secs = server->config->param.keepalive_secs;
1881
1882         if (!param->qos && server->config->param.qos) {
1883           param->qos = server->config->param.qos;
1884           param->qos_rate_limit = server->config->param.qos_rate_limit;
1885           param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1886           param->qos_limit_sec = server->config->param.qos_limit_sec;
1887           param->qos_limit_usec = server->config->param.qos_limit_usec;
1888         }
1889
1890         /* Check if to be anonymous connection */
1891         if (param->anonymous)
1892           client->mode |= SILC_UMODE_ANONYMOUS;
1893       }
1894
1895       id_entry = (void *)client;
1896       break;
1897     }
1898   case SILC_SOCKET_TYPE_SERVER:
1899   case SILC_SOCKET_TYPE_ROUTER:
1900     {
1901       SilcServerEntry new_server;
1902       bool initiator = FALSE;
1903       bool backup_local = FALSE;
1904       bool backup_router = FALSE;
1905       char *backup_replace_ip = NULL;
1906       SilcUInt16 backup_replace_port = 0;
1907       SilcServerConfigServer *sconn = ctx->sconfig.ref_ptr;
1908       SilcServerConfigRouter *rconn = ctx->rconfig.ref_ptr;
1909
1910       /* If we are backup router and this is incoming server connection
1911          and we do not have connection to primary router, do not allow
1912          the connection. */
1913       if (server->server_type == SILC_BACKUP_ROUTER &&
1914           ctx->conn_type == SILC_SOCKET_TYPE_SERVER &&
1915           !SILC_PRIMARY_ROUTE(server)) {
1916         SILC_LOG_INFO(("Will not accept server connection because we do "
1917                        "not have primary router connection established"));
1918         silc_server_disconnect_remote(server, sock,
1919                                       SILC_STATUS_ERR_PERM_DENIED,
1920                                       "We do not have connection to primary "
1921                                       "router established, try later");
1922         silc_free(sock->user_data);
1923         server->stat.auth_failures++;
1924         goto out;
1925       }
1926
1927       if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
1928         /* Verify whether this connection is after all allowed to connect */
1929         if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1930                                             &server->config->param,
1931                                             rconn ? rconn->param : NULL,
1932                                             ctx->ske)) {
1933           silc_free(sock->user_data);
1934           server->stat.auth_failures++;
1935           goto out;
1936         }
1937
1938         if (rconn) {
1939           if (rconn->param) {
1940             param = rconn->param;
1941
1942             if (!param->keepalive_secs)
1943               param->keepalive_secs = server->config->param.keepalive_secs;
1944
1945             if (!param->qos && server->config->param.qos) {
1946               param->qos = server->config->param.qos;
1947               param->qos_rate_limit = server->config->param.qos_rate_limit;
1948               param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1949               param->qos_limit_sec = server->config->param.qos_limit_sec;
1950               param->qos_limit_usec = server->config->param.qos_limit_usec;
1951             }
1952           }
1953
1954           initiator = rconn->initiator;
1955           backup_local = rconn->backup_local;
1956           backup_router = rconn->backup_router;
1957           backup_replace_ip = rconn->backup_replace_ip;
1958           backup_replace_port = rconn->backup_replace_port;
1959         }
1960       }
1961
1962       if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
1963         /* Verify whether this connection is after all allowed to connect */
1964         if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1965                                             &server->config->param,
1966                                             sconn ? sconn->param : NULL,
1967                                             ctx->ske)) {
1968           silc_free(sock->user_data);
1969           server->stat.auth_failures++;
1970           goto out;
1971         }
1972         if (sconn) {
1973           if (sconn->param) {
1974             param = sconn->param;
1975
1976             if (!param->keepalive_secs)
1977               param->keepalive_secs = server->config->param.keepalive_secs;
1978
1979             if (!param->qos && server->config->param.qos) {
1980               param->qos = server->config->param.qos;
1981               param->qos_rate_limit = server->config->param.qos_rate_limit;
1982               param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1983               param->qos_limit_sec = server->config->param.qos_limit_sec;
1984               param->qos_limit_usec = server->config->param.qos_limit_usec;
1985             }
1986           }
1987
1988           backup_router = sconn->backup_router;
1989         }
1990       }
1991
1992       /* If we are primary router and we have backup router configured
1993          but it has not connected to use yet, do not accept any other
1994          connection. */
1995       if (server->wait_backup && server->server_type == SILC_ROUTER &&
1996           !server->backup_router && !backup_router) {
1997         SilcServerConfigRouter *router;
1998         router = silc_server_config_get_backup_router(server);
1999         if (router && strcmp(server->config->server_info->primary->server_ip,
2000                              sock->ip) &&
2001             silc_server_find_socket_by_host(server,
2002                                             SILC_SOCKET_TYPE_SERVER,
2003                                             router->backup_replace_ip, 0)) {
2004           SILC_LOG_INFO(("Will not accept connections because we do "
2005                          "not have backup router connection established"));
2006           silc_server_disconnect_remote(server, sock,
2007                                         SILC_STATUS_ERR_PERM_DENIED,
2008                                         "We do not have connection to backup "
2009                                         "router established, try later");
2010           silc_free(sock->user_data);
2011           server->stat.auth_failures++;
2012
2013           /* From here on, wait 10 seconds for the backup router to appear. */
2014           silc_schedule_task_add(server->schedule, 0,
2015                                  silc_server_backup_router_wait,
2016                                  (void *)server, 10, 0,
2017                                  SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2018           goto out;
2019         }
2020       }
2021
2022       SILC_LOG_DEBUG(("Remote host is %s",
2023                       ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2024                       "server" : (backup_router ?
2025                                   "backup router" : "router")));
2026       SILC_LOG_INFO(("Connection %s (%s) is %s", sock->hostname,
2027                      sock->ip, ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2028                      "server" : (backup_router ?
2029                                  "backup router" : "router")));
2030
2031       /* Add the server into server cache. The server name and Server ID
2032          is updated after we have received NEW_SERVER packet from the
2033          server. We mark ourselves as router for this server if we really
2034          are router. */
2035       new_server =
2036         silc_idlist_add_server((ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2037                                 server->local_list : (backup_router ?
2038                                                       server->local_list :
2039                                                       server->global_list)),
2040                                NULL,
2041                                (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2042                                 SILC_SERVER : SILC_ROUTER),
2043                                NULL,
2044                                (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2045                                 server->id_entry : (backup_router ?
2046                                                     server->id_entry : NULL)),
2047                                sock);
2048       if (!new_server) {
2049         SILC_LOG_ERROR(("Could not add new server to cache"));
2050         silc_free(sock->user_data);
2051         silc_server_disconnect_remote(server, sock,
2052                                       SILC_STATUS_ERR_AUTH_FAILED, NULL);
2053         server->stat.auth_failures++;
2054         goto out;
2055       }
2056       entry->data.status |= SILC_IDLIST_STATUS_LOCAL;
2057
2058       id_entry = (void *)new_server;
2059
2060       /* If the incoming connection is router and marked as backup router
2061          then add it to be one of our backups */
2062       if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER && backup_router) {
2063         /* Change it back to SERVER type since that's what it really is. */
2064         if (backup_local)
2065           ctx->conn_type = SILC_SOCKET_TYPE_SERVER;
2066         new_server->server_type = SILC_BACKUP_ROUTER;
2067
2068         SILC_SERVER_SEND_OPERS(server, FALSE, TRUE, SILC_NOTIFY_TYPE_NONE,
2069                                ("Backup router %s is now online",
2070                                 sock->hostname));
2071
2072         /* Remove the backup waiting with timeout */
2073         silc_schedule_task_add(server->schedule, 0,
2074                                silc_server_backup_router_wait,
2075                                (void *)server, 5, 0,
2076                                SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2077       }
2078
2079       /* Statistics */
2080       if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
2081         server->stat.my_servers++;
2082       } else {
2083         server->stat.my_routers++;
2084         server->stat.routers++;
2085       }
2086       server->stat.servers++;
2087
2088       /* Check whether this connection is to be our primary router connection
2089          if we do not already have the primary route. */
2090       if (!backup_router &&
2091           server->standalone && ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
2092         if (silc_server_config_is_primary_route(server) && !initiator)
2093           break;
2094
2095         SILC_LOG_DEBUG(("We are not standalone server anymore"));
2096         server->standalone = FALSE;
2097         if (!server->id_entry->router) {
2098           server->id_entry->router = id_entry;
2099           server->router = id_entry;
2100         }
2101       }
2102
2103       break;
2104     }
2105   default:
2106     goto out;
2107     break;
2108   }
2109
2110   sock->type = ctx->conn_type;
2111
2112   /* Add the common data structure to the ID entry. */
2113   silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
2114
2115   /* Add to sockets internal pointer for fast referencing */
2116   silc_free(sock->user_data);
2117   sock->user_data = id_entry;
2118
2119   /* Connection has been fully established now. Everything is ok. */
2120   SILC_LOG_DEBUG(("New connection authenticated"));
2121
2122   /* Perform keepalive. */
2123   if (param->keepalive_secs)
2124     silc_socket_set_heartbeat(sock, param->keepalive_secs, server,
2125                               silc_server_perform_heartbeat,
2126                               server->schedule);
2127
2128   /* Perform Quality of Service */
2129   if (param->qos)
2130     silc_socket_set_qos(sock, param->qos_rate_limit, param->qos_bytes_limit,
2131                         param->qos_limit_sec, param->qos_limit_usec,
2132                         server->schedule);
2133
2134  out:
2135   silc_schedule_task_del_by_callback(server->schedule,
2136                                      silc_server_failure_callback);
2137   silc_protocol_free(protocol);
2138   if (ctx->packet)
2139     silc_packet_context_free(ctx->packet);
2140   if (ctx->ske)
2141     silc_ske_free(ctx->ske);
2142   silc_free(ctx->dest_id);
2143   silc_server_config_unref(&ctx->cconfig);
2144   silc_server_config_unref(&ctx->sconfig);
2145   silc_server_config_unref(&ctx->rconfig);
2146   silc_free(ctx);
2147   sock->protocol = NULL;
2148 }
2149
2150 /* This function is used to read packets from network and send packets to
2151    network. This is usually a generic task. */
2152
2153 SILC_TASK_CALLBACK(silc_server_packet_process)
2154 {
2155   SilcServer server = (SilcServer)context;
2156   SilcSocketConnection sock = server->sockets[fd];
2157   SilcIDListData idata;
2158   SilcCipher cipher = NULL;
2159   SilcHmac hmac = NULL;
2160   SilcUInt32 sequence = 0;
2161   int ret;
2162
2163   if (!sock) {
2164     SILC_LOG_DEBUG(("Unknown socket connection"));
2165     return;
2166   }
2167
2168   /* Packet sending */
2169
2170   if (type == SILC_TASK_WRITE) {
2171     /* Do not send data to disconnected connection */
2172     if (SILC_IS_DISCONNECTED(sock)) {
2173       SILC_LOG_DEBUG(("Disconnected socket connection, cannot send"));
2174       return;
2175     }
2176
2177     server->stat.packets_sent++;
2178
2179     /* Send the packet */
2180     ret = silc_packet_send(sock, TRUE);
2181
2182     /* If returned -2 could not write to connection now, will do
2183        it later. */
2184     if (ret == -2)
2185       return;
2186
2187     /* The packet has been sent and now it is time to set the connection
2188        back to only for input. When there is again some outgoing data
2189        available for this connection it will be set for output as well.
2190        This call clears the output setting and sets it only for input. */
2191     SILC_SET_CONNECTION_FOR_INPUT(server->schedule, fd);
2192     SILC_UNSET_OUTBUF_PENDING(sock);
2193     silc_buffer_clear(sock->outbuf);
2194
2195     if (ret == -1) {
2196       SILC_LOG_ERROR(("Error sending packet to connection "
2197                       "%s:%d [%s]", sock->hostname, sock->port,
2198                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2199                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2200                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2201                        "Router")));
2202
2203       SILC_SET_DISCONNECTING(sock);
2204       if (sock->user_data)
2205         silc_server_free_sock_user_data(server, sock, NULL);
2206       silc_server_close_connection(server, sock);
2207     }
2208     return;
2209   }
2210
2211   /* Packet receiving */
2212
2213   /* Read some data from connection */
2214   ret = silc_packet_receive(sock);
2215   if (ret < 0) {
2216
2217     if (ret == -1) {
2218       SILC_LOG_ERROR(("Error receiving packet from connection "
2219                       "%s:%d [%s] %s", sock->hostname, sock->port,
2220                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2221                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2222                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2223                        "Router"), strerror(errno)));
2224
2225       SILC_SET_DISCONNECTING(sock);
2226       if (sock->user_data)
2227         silc_server_free_sock_user_data(server, sock, NULL);
2228       silc_server_close_connection(server, sock);
2229     }
2230     return;
2231   }
2232
2233   /* EOF */
2234   if (ret == 0) {
2235     SILC_LOG_DEBUG(("Read EOF"));
2236
2237     /* If connection is disconnecting already we will finally
2238        close the connection */
2239     if (SILC_IS_DISCONNECTING(sock)) {
2240       if (sock->user_data)
2241         silc_server_free_sock_user_data(server, sock, NULL);
2242       silc_server_close_connection(server, sock);
2243       return;
2244     }
2245
2246     SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
2247     SILC_SET_DISCONNECTING(sock);
2248
2249     if (sock->user_data) {
2250       char tmp[128];
2251       if (silc_socket_get_error(sock, tmp, sizeof(tmp) - 1))
2252         silc_server_free_sock_user_data(server, sock, tmp);
2253       else
2254         silc_server_free_sock_user_data(server, sock, NULL);
2255     } else if (server->router_conn && server->router_conn->sock == sock &&
2256              !server->router && server->standalone)
2257       silc_schedule_task_add(server->schedule, 0,
2258                              silc_server_connect_to_router,
2259                              server, 1, 0,
2260                              SILC_TASK_TIMEOUT,
2261                              SILC_TASK_PRI_NORMAL);
2262
2263     silc_server_close_connection(server, sock);
2264     return;
2265   }
2266
2267   /* If connection is disconnecting or disconnected we will ignore
2268      what we read. */
2269   if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
2270     SILC_LOG_DEBUG(("Ignoring read data from disconnected connection"));
2271     return;
2272   }
2273
2274   /* Get keys and stuff from ID entry */
2275   idata = (SilcIDListData)sock->user_data;
2276   if (idata) {
2277     cipher = idata->receive_key;
2278     hmac = idata->hmac_receive;
2279     sequence = idata->psn_receive;
2280   }
2281
2282   /* Process the packet. This will call the parser that will then
2283      decrypt and parse the packet. */
2284   ret = silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
2285                                     TRUE : FALSE, cipher, hmac, sequence,
2286                                     silc_server_packet_parse, server);
2287
2288   /* If processing failed the connection is closed. */
2289   if (!ret) {
2290     /* On packet processing errors we may close our primary router
2291        connection but won't become primary router if we are the backup
2292        since this is local error condition. */
2293     if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2294       server->backup_noswitch = TRUE;
2295
2296     if (sock->user_data)
2297       silc_server_free_sock_user_data(server, sock, NULL);
2298     silc_server_close_connection(server, sock);
2299   }
2300 }
2301
2302 /* Parses whole packet, received earlier. */
2303
2304 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
2305 {
2306   SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
2307   SilcServer server = (SilcServer)parse_ctx->context;
2308   SilcSocketConnection sock = parse_ctx->sock;
2309   SilcPacketContext *packet = parse_ctx->packet;
2310   SilcIDListData idata = (SilcIDListData)sock->user_data;
2311   int ret;
2312
2313   server->stat.packets_received++;
2314
2315   /* Parse the packet */
2316   if (parse_ctx->normal)
2317     ret = silc_packet_parse(packet, idata ? idata->receive_key : NULL);
2318   else
2319     ret = silc_packet_parse_special(packet, idata ? idata->receive_key : NULL);
2320
2321   /* If entry is disabled ignore what we got. */
2322   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED &&
2323       ret != SILC_PACKET_HEARTBEAT && ret != SILC_PACKET_RESUME_ROUTER &&
2324       ret != SILC_PACKET_REKEY && ret != SILC_PACKET_REKEY_DONE) {
2325     SILC_LOG_DEBUG(("Connection is disabled"));
2326     goto out;
2327   }
2328
2329   if (ret == SILC_PACKET_NONE) {
2330     SILC_LOG_DEBUG(("Error parsing packet"));
2331     goto out;
2332   }
2333
2334   /* Check that the the current client ID is same as in the client's packet. */
2335   if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
2336     SilcClientEntry client = (SilcClientEntry)sock->user_data;
2337     if (client && client->id && packet->src_id) {
2338       void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
2339                                 packet->src_id_type);
2340       if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
2341         silc_free(id);
2342         SILC_LOG_DEBUG(("Packet source is not same as sender"));
2343         goto out;
2344       }
2345       silc_free(id);
2346     }
2347   }
2348
2349   if (server->server_type == SILC_ROUTER) {
2350     /* Route the packet if it is not destined to us. Other ID types but
2351        server are handled separately after processing them. */
2352     if (packet->dst_id && !(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
2353         packet->dst_id_type == SILC_ID_SERVER &&
2354         sock->type != SILC_SOCKET_TYPE_CLIENT &&
2355         memcmp(packet->dst_id, server->id_string, server->id_string_len)) {
2356
2357       /* Route the packet to fastest route for the destination ID */
2358       void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
2359                                 packet->dst_id_type);
2360       if (!id)
2361         goto out;
2362       silc_server_packet_route(server,
2363                                silc_server_route_get(server, id,
2364                                                      packet->dst_id_type),
2365                                packet);
2366       silc_free(id);
2367       goto out;
2368     }
2369   }
2370
2371   /* Parse the incoming packet type */
2372   silc_server_packet_parse_type(server, sock, packet);
2373
2374   /* Broadcast packet if it is marked as broadcast packet and it is
2375      originated from router and we are router. */
2376   if (server->server_type == SILC_ROUTER &&
2377       sock->type == SILC_SOCKET_TYPE_ROUTER &&
2378       packet->flags & SILC_PACKET_FLAG_BROADCAST) {
2379     /* Broadcast to our primary route */
2380     silc_server_packet_broadcast(server, SILC_PRIMARY_ROUTE(server), packet);
2381
2382     /* If we have backup routers then we need to feed all broadcast
2383        data to those servers. */
2384     silc_server_backup_broadcast(server, sock, packet);
2385   }
2386
2387  out:
2388   silc_packet_context_free(packet);
2389   silc_free(parse_ctx);
2390 }
2391
2392 /* Parser callback called by silc_packet_receive_process. This merely
2393    registers timeout that will handle the actual parsing when appropriate. */
2394
2395 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
2396                               void *context)
2397 {
2398   SilcServer server = (SilcServer)context;
2399   SilcSocketConnection sock = parser_context->sock;
2400   SilcIDListData idata = (SilcIDListData)sock->user_data;
2401   bool ret;
2402
2403   if (idata)
2404     idata->psn_receive = parser_context->packet->sequence + 1;
2405
2406   /* If protocol for this connection is key exchange or rekey then we'll
2407      process all packets synchronously, since there might be packets in
2408      queue that we are not able to decrypt without first processing the
2409      packets before them. */
2410   if ((parser_context->packet->type == SILC_PACKET_REKEY ||
2411        parser_context->packet->type == SILC_PACKET_REKEY_DONE) ||
2412       (sock->protocol && sock->protocol->protocol &&
2413        (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2414         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY))) {
2415     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2416                                   parser_context);
2417
2418     /* Reprocess data since we'll return FALSE here.  This is because
2419        the idata->receive_key might have become valid in the last packet
2420        and we want to call this processor with valid cipher. */
2421     if (idata)
2422       ret = silc_packet_receive_process(
2423                                   sock, server->server_type == SILC_ROUTER ?
2424                                   TRUE : FALSE, idata->receive_key,
2425                                   idata->hmac_receive, idata->psn_receive,
2426                                   silc_server_packet_parse, server);
2427     else
2428       ret = silc_packet_receive_process(
2429                                   sock, server->server_type == SILC_ROUTER ?
2430                                   TRUE : FALSE, NULL, NULL, 0,
2431                                   silc_server_packet_parse, server);
2432
2433     if (!ret) {
2434       /* On packet processing errors we may close our primary router
2435          connection but won't become primary router if we are the backup
2436          since this is local error condition. */
2437       if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2438         server->backup_noswitch = TRUE;
2439
2440       if (sock->user_data)
2441         silc_server_free_sock_user_data(server, sock, NULL);
2442       silc_server_close_connection(server, sock);
2443     }
2444
2445     return FALSE;
2446   }
2447
2448   switch (sock->type) {
2449   case SILC_SOCKET_TYPE_UNKNOWN:
2450   case SILC_SOCKET_TYPE_CLIENT:
2451     /* Parse the packet with timeout */
2452     silc_schedule_task_add(server->schedule, sock->sock,
2453                            silc_server_packet_parse_real,
2454                            (void *)parser_context, 0, 100000,
2455                            SILC_TASK_TIMEOUT,
2456                            SILC_TASK_PRI_NORMAL);
2457     break;
2458   case SILC_SOCKET_TYPE_SERVER:
2459   case SILC_SOCKET_TYPE_ROUTER:
2460     /* Packets from servers are parsed immediately */
2461     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2462                                   parser_context);
2463     break;
2464   default:
2465     return TRUE;
2466   }
2467
2468   return TRUE;
2469 }
2470
2471 /* Parses the packet type and calls what ever routines the packet type
2472    requires. This is done for all incoming packets. */
2473
2474 void silc_server_packet_parse_type(SilcServer server,
2475                                    SilcSocketConnection sock,
2476                                    SilcPacketContext *packet)
2477 {
2478   SilcPacketType type = packet->type;
2479   SilcIDListData idata = (SilcIDListData)sock->user_data;
2480
2481   SILC_LOG_DEBUG(("Received %s packet [flags %d]",
2482                   silc_get_packet_name(type), packet->flags));
2483
2484   /* Parse the packet type */
2485   switch (type) {
2486   case SILC_PACKET_DISCONNECT:
2487     {
2488       SilcStatus status;
2489       char *message = NULL;
2490
2491       if (packet->flags & SILC_PACKET_FLAG_LIST)
2492         break;
2493       if (packet->buffer->len < 1)
2494         break;
2495
2496       status = (SilcStatus)packet->buffer->data[0];
2497       if (packet->buffer->len > 1 &&
2498           silc_utf8_valid(packet->buffer->data + 1, packet->buffer->len - 1))
2499         message = silc_memdup(packet->buffer->data + 1,
2500                               packet->buffer->len - 1);
2501
2502       SILC_LOG_INFO(("Disconnected by %s (%s): %s (%d) %s",
2503                      sock->ip, sock->hostname,
2504                      silc_get_status_message(status), status,
2505                      message ? message : ""));
2506       silc_free(message);
2507
2508       /* Handle the disconnection from our end too */
2509       if (sock->user_data && SILC_IS_LOCAL(sock->user_data))
2510         silc_server_free_sock_user_data(server, sock, NULL);
2511       silc_server_close_connection(server, sock);
2512     }
2513     break;
2514
2515   case SILC_PACKET_SUCCESS:
2516     /*
2517      * Success received for something. For now we can have only
2518      * one protocol for connection executing at once hence this
2519      * success message is for whatever protocol is executing currently.
2520      */
2521     if (packet->flags & SILC_PACKET_FLAG_LIST)
2522       break;
2523     if (sock->protocol)
2524       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2525     break;
2526
2527   case SILC_PACKET_FAILURE:
2528     /*
2529      * Failure received for something. For now we can have only
2530      * one protocol for connection executing at once hence this
2531      * failure message is for whatever protocol is executing currently.
2532      */
2533     if (packet->flags & SILC_PACKET_FLAG_LIST)
2534       break;
2535     if (sock->protocol) {
2536       SilcServerFailureContext f;
2537       f = silc_calloc(1, sizeof(*f));
2538       f->sock = silc_socket_dup(sock);
2539
2540       /* We will wait 5 seconds to process this failure packet */
2541       silc_schedule_task_add(server->schedule, sock->sock,
2542                              silc_server_failure_callback, (void *)f, 5, 0,
2543                              SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2544     }
2545     break;
2546
2547   case SILC_PACKET_REJECT:
2548     if (packet->flags & SILC_PACKET_FLAG_LIST)
2549       break;
2550     return;
2551     break;
2552
2553   case SILC_PACKET_NOTIFY:
2554     /*
2555      * Received notify packet. Server can receive notify packets from
2556      * router. Server then relays the notify messages to clients if needed.
2557      */
2558     if (packet->flags & SILC_PACKET_FLAG_LIST)
2559       silc_server_notify_list(server, sock, packet);
2560     else
2561       silc_server_notify(server, sock, packet);
2562     break;
2563
2564     /*
2565      * Channel packets
2566      */
2567   case SILC_PACKET_CHANNEL_MESSAGE:
2568     /*
2569      * Received channel message. Channel messages are special packets
2570      * (although probably most common ones) thus they are handled
2571      * specially.
2572      */
2573     if (packet->flags & SILC_PACKET_FLAG_LIST)
2574       break;
2575     idata->last_receive = time(NULL);
2576     silc_server_channel_message(server, sock, packet);
2577     break;
2578
2579   case SILC_PACKET_CHANNEL_KEY:
2580     /*
2581      * Received key for channel. As channels are created by the router
2582      * the keys are as well. We will distribute the key to all of our
2583      * locally connected clients on the particular channel. Router
2584      * never receives this channel and thus is ignored.
2585      */
2586     if (packet->flags & SILC_PACKET_FLAG_LIST)
2587       break;
2588     silc_server_channel_key(server, sock, packet);
2589     break;
2590
2591     /*
2592      * Command packets
2593      */
2594   case SILC_PACKET_COMMAND:
2595     /*
2596      * Recived command. Processes the command request and allocates the
2597      * command context and calls the command.
2598      */
2599     if (packet->flags & SILC_PACKET_FLAG_LIST)
2600       break;
2601     silc_server_command_process(server, sock, packet);
2602     break;
2603
2604   case SILC_PACKET_COMMAND_REPLY:
2605     /*
2606      * Received command reply packet. Received command reply to command. It
2607      * may be reply to command sent by us or reply to command sent by client
2608      * that we've routed further.
2609      */
2610     if (packet->flags & SILC_PACKET_FLAG_LIST)
2611       break;
2612     silc_server_command_reply(server, sock, packet);
2613     break;
2614
2615     /*
2616      * Private Message packets
2617      */
2618   case SILC_PACKET_PRIVATE_MESSAGE:
2619     /*
2620      * Received private message packet. The packet is coming from either
2621      * client or server.
2622      */
2623     if (packet->flags & SILC_PACKET_FLAG_LIST)
2624       break;
2625     idata->last_receive = time(NULL);
2626     silc_server_private_message(server, sock, packet);
2627     break;
2628
2629   case SILC_PACKET_PRIVATE_MESSAGE_KEY:
2630     /*
2631      * Private message key packet.
2632      */
2633     if (packet->flags & SILC_PACKET_FLAG_LIST)
2634       break;
2635     silc_server_private_message_key(server, sock, packet);
2636     break;
2637
2638     /*
2639      * Key Exchange protocol packets
2640      */
2641   case SILC_PACKET_KEY_EXCHANGE:
2642     if (packet->flags & SILC_PACKET_FLAG_LIST)
2643       break;
2644
2645     if (sock->protocol && sock->protocol->protocol &&
2646         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
2647       SilcServerKEInternalContext *proto_ctx =
2648         (SilcServerKEInternalContext *)sock->protocol->context;
2649
2650       proto_ctx->packet = silc_packet_context_dup(packet);
2651
2652       /* Let the protocol handle the packet */
2653       silc_protocol_execute(sock->protocol, server->schedule, 0, 100000);
2654     } else {
2655       SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
2656                       "protocol active, packet dropped."));
2657     }
2658     break;
2659
2660   case SILC_PACKET_KEY_EXCHANGE_1:
2661     if (packet->flags & SILC_PACKET_FLAG_LIST)
2662       break;
2663
2664     if (sock->protocol && sock->protocol->protocol &&
2665         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2666          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2667
2668       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2669         SilcServerRekeyInternalContext *proto_ctx =
2670           (SilcServerRekeyInternalContext *)sock->protocol->context;
2671
2672         if (proto_ctx->packet)
2673           silc_packet_context_free(proto_ctx->packet);
2674
2675         proto_ctx->packet = silc_packet_context_dup(packet);
2676
2677         /* Let the protocol handle the packet */
2678         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2679       } else {
2680         SilcServerKEInternalContext *proto_ctx =
2681           (SilcServerKEInternalContext *)sock->protocol->context;
2682
2683         if (proto_ctx->packet)
2684           silc_packet_context_free(proto_ctx->packet);
2685
2686         proto_ctx->packet = silc_packet_context_dup(packet);
2687         proto_ctx->dest_id_type = packet->src_id_type;
2688         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2689                                             packet->src_id_type);
2690         if (!proto_ctx->dest_id)
2691           break;
2692
2693         /* Let the protocol handle the packet */
2694         silc_protocol_execute(sock->protocol, server->schedule,
2695                               0, 100000);
2696       }
2697     } else {
2698       SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
2699                       "protocol active, packet dropped."));
2700     }
2701     break;
2702
2703   case SILC_PACKET_KEY_EXCHANGE_2:
2704     if (packet->flags & SILC_PACKET_FLAG_LIST)
2705       break;
2706
2707     if (sock->protocol && sock->protocol->protocol &&
2708         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2709          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2710
2711       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2712         SilcServerRekeyInternalContext *proto_ctx =
2713           (SilcServerRekeyInternalContext *)sock->protocol->context;
2714
2715         if (proto_ctx->packet)
2716           silc_packet_context_free(proto_ctx->packet);
2717
2718         proto_ctx->packet = silc_packet_context_dup(packet);
2719
2720         /* Let the protocol handle the packet */
2721         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2722       } else {
2723         SilcServerKEInternalContext *proto_ctx =
2724           (SilcServerKEInternalContext *)sock->protocol->context;
2725
2726         if (proto_ctx->packet)
2727           silc_packet_context_free(proto_ctx->packet);
2728
2729         proto_ctx->packet = silc_packet_context_dup(packet);
2730         proto_ctx->dest_id_type = packet->src_id_type;
2731         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2732                                             packet->src_id_type);
2733         if (!proto_ctx->dest_id)
2734           break;
2735
2736         /* Let the protocol handle the packet */
2737         silc_protocol_execute(sock->protocol, server->schedule,
2738                               0, 100000);
2739       }
2740     } else {
2741       SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
2742                       "protocol active, packet dropped."));
2743     }
2744     break;
2745
2746   case SILC_PACKET_CONNECTION_AUTH_REQUEST:
2747     /*
2748      * Connection authentication request packet. When we receive this packet
2749      * we will send to the other end information about our mandatory
2750      * authentication method for the connection. This packet maybe received
2751      * at any time.
2752      */
2753     if (packet->flags & SILC_PACKET_FLAG_LIST)
2754       break;
2755     silc_server_connection_auth_request(server, sock, packet);
2756     break;
2757
2758     /*
2759      * Connection Authentication protocol packets
2760      */
2761   case SILC_PACKET_CONNECTION_AUTH:
2762     /* Start of the authentication protocol. We receive here the
2763        authentication data and will verify it. */
2764     if (packet->flags & SILC_PACKET_FLAG_LIST)
2765       break;
2766
2767     if (sock->protocol && sock->protocol->protocol->type
2768         == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
2769
2770       SilcServerConnAuthInternalContext *proto_ctx =
2771         (SilcServerConnAuthInternalContext *)sock->protocol->context;
2772
2773       proto_ctx->packet = silc_packet_context_dup(packet);
2774
2775       /* Let the protocol handle the packet */
2776       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2777     } else {
2778       SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
2779                       "protocol active, packet dropped."));
2780     }
2781     break;
2782
2783   case SILC_PACKET_NEW_ID:
2784     /*
2785      * Received New ID packet. This includes some new ID that has been
2786      * created. It may be for client, server or channel. This is the way
2787      * to distribute information about new registered entities in the
2788      * SILC network.
2789      */
2790     if (packet->flags & SILC_PACKET_FLAG_LIST)
2791       silc_server_new_id_list(server, sock, packet);
2792     else
2793       silc_server_new_id(server, sock, packet);
2794     break;
2795
2796   case SILC_PACKET_NEW_CLIENT:
2797     /*
2798      * Received new client packet. This includes client information that
2799      * we will use to create initial client ID. After creating new
2800      * ID we will send it to the client.
2801      */
2802     if (packet->flags & SILC_PACKET_FLAG_LIST)
2803       break;
2804     silc_server_new_client(server, sock, packet);
2805     break;
2806
2807   case SILC_PACKET_NEW_SERVER:
2808     /*
2809      * Received new server packet. This includes Server ID and some other
2810      * information that we may save. This is received after server has
2811      * connected to us.
2812      */
2813     if (packet->flags & SILC_PACKET_FLAG_LIST)
2814       break;
2815     silc_server_new_server(server, sock, packet);
2816     break;
2817
2818   case SILC_PACKET_NEW_CHANNEL:
2819     /*
2820      * Received new channel packet. Information about new channel in the
2821      * network are distributed using this packet.
2822      */
2823     if (packet->flags & SILC_PACKET_FLAG_LIST)
2824       silc_server_new_channel_list(server, sock, packet);
2825     else
2826       silc_server_new_channel(server, sock, packet);
2827     break;
2828
2829   case SILC_PACKET_HEARTBEAT:
2830     /*
2831      * Received heartbeat.
2832      */
2833     if (packet->flags & SILC_PACKET_FLAG_LIST)
2834       break;
2835     break;
2836
2837   case SILC_PACKET_KEY_AGREEMENT:
2838     /*
2839      * Received heartbeat.
2840      */
2841     if (packet->flags & SILC_PACKET_FLAG_LIST)
2842       break;
2843     silc_server_key_agreement(server, sock, packet);
2844     break;
2845
2846   case SILC_PACKET_REKEY:
2847     /*
2848      * Received re-key packet. The sender wants to regenerate the session
2849      * keys.
2850      */
2851     if (packet->flags & SILC_PACKET_FLAG_LIST)
2852       break;
2853     silc_server_rekey(server, sock, packet);
2854     break;
2855
2856   case SILC_PACKET_REKEY_DONE:
2857     /*
2858      * The re-key is done.
2859      */
2860     if (packet->flags & SILC_PACKET_FLAG_LIST)
2861       break;
2862
2863     if (sock->protocol && sock->protocol->protocol &&
2864         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2865
2866       SilcServerRekeyInternalContext *proto_ctx =
2867         (SilcServerRekeyInternalContext *)sock->protocol->context;
2868
2869       if (proto_ctx->packet)
2870         silc_packet_context_free(proto_ctx->packet);
2871
2872       proto_ctx->packet = silc_packet_context_dup(packet);
2873
2874       /* Let the protocol handle the packet */
2875       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2876     } else {
2877       SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2878                       "protocol active, packet dropped."));
2879     }
2880     break;
2881
2882   case SILC_PACKET_FTP:
2883     /* FTP packet */
2884     if (packet->flags & SILC_PACKET_FLAG_LIST)
2885       break;
2886     silc_server_ftp(server, sock, packet);
2887     break;
2888
2889   case SILC_PACKET_RESUME_CLIENT:
2890     /* Resume client */
2891     if (packet->flags & SILC_PACKET_FLAG_LIST)
2892       break;
2893     silc_server_resume_client(server, sock, packet);
2894     break;
2895
2896   case SILC_PACKET_RESUME_ROUTER:
2897     /* Resume router packet received. This packet is received for backup
2898        router resuming protocol. */
2899     if (packet->flags & SILC_PACKET_FLAG_LIST)
2900       break;
2901     silc_server_backup_resume_router(server, sock, packet);
2902     break;
2903
2904   default:
2905     SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2906     break;
2907   }
2908 }
2909
2910 /* Creates connection to a remote router. */
2911
2912 void silc_server_create_connection(SilcServer server,
2913                                    const char *remote_host, SilcUInt32 port)
2914 {
2915   SilcServerConnection sconn;
2916
2917   /* Allocate connection object for hold connection specific stuff. */
2918   sconn = silc_calloc(1, sizeof(*sconn));
2919   sconn->remote_host = strdup(remote_host);
2920   sconn->remote_port = port;
2921   sconn->no_reconnect = TRUE;
2922
2923   silc_schedule_task_add(server->schedule, 0,
2924                          silc_server_connect_router,
2925                          (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2926                          SILC_TASK_PRI_NORMAL);
2927 }
2928
2929 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2930 {
2931   silc_socket_free(context);
2932 }
2933
2934 /* Closes connection to socket connection */
2935
2936 void silc_server_close_connection(SilcServer server,
2937                                   SilcSocketConnection sock)
2938 {
2939   char tmp[128];
2940
2941   if (!server->sockets[sock->sock] && SILC_IS_DISCONNECTED(sock)) {
2942     silc_schedule_task_add(server->schedule, 0,
2943                            silc_server_close_connection_final,
2944                            (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2945                            SILC_TASK_PRI_NORMAL);
2946     return;
2947   }
2948
2949   memset(tmp, 0, sizeof(tmp));
2950   silc_socket_get_error(sock, tmp, sizeof(tmp));
2951   SILC_LOG_INFO(("Closing connection %s:%d [%s] %s", sock->hostname,
2952                   sock->port,
2953                   (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2954                    sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2955                    sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2956                    "Router"), tmp[0] ? tmp : ""));
2957
2958   /* We won't listen for this connection anymore */
2959   silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2960
2961   /* Unregister all tasks */
2962   silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2963
2964   /* Close the actual connection */
2965   silc_net_close_connection(sock->sock);
2966   server->sockets[sock->sock] = NULL;
2967
2968   /* If sock->user_data is NULL then we'll check for active protocols
2969      here since the silc_server_free_sock_user_data has not been called
2970      for this connection. */
2971   if (!sock->user_data) {
2972     /* If any protocol is active cancel its execution. It will call
2973        the final callback which will finalize the disconnection. */
2974     if (sock->protocol) {
2975       SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
2976       silc_protocol_cancel(sock->protocol, server->schedule);
2977       sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2978       silc_protocol_execute_final(sock->protocol, server->schedule);
2979       sock->protocol = NULL;
2980       return;
2981     }
2982   }
2983
2984   silc_schedule_task_add(server->schedule, 0,
2985                          silc_server_close_connection_final,
2986                          (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2987                          SILC_TASK_PRI_NORMAL);
2988 }
2989
2990 /* Sends disconnect message to remote connection and disconnects the
2991    connection. */
2992
2993 void silc_server_disconnect_remote(SilcServer server,
2994                                    SilcSocketConnection sock,
2995                                    SilcStatus status, ...)
2996 {
2997   va_list ap;
2998   unsigned char buf[512];
2999   SilcBuffer buffer;
3000   char *cp;
3001   int len;
3002
3003   if (!sock || SILC_IS_DISCONNECTED(sock))
3004     return;
3005
3006   memset(buf, 0, sizeof(buf));
3007   va_start(ap, status);
3008   cp = va_arg(ap, char *);
3009   if (cp) {
3010     vsnprintf(buf, sizeof(buf) - 1, cp, ap);
3011     cp = buf;
3012   }
3013   va_end(ap);
3014
3015   SILC_LOG_DEBUG(("Disconnecting remote host"));
3016
3017   /* Notify remote end that the conversation is over. The notify message
3018      is tried to be sent immediately. */
3019
3020   len = 1;
3021   if (cp)
3022     len += silc_utf8_encoded_len(buf, strlen(buf), SILC_STRING_ASCII);
3023
3024   buffer = silc_buffer_alloc_size(len);
3025   if (!buffer)
3026     goto out;
3027
3028   buffer->data[0] = status;
3029   if (cp)
3030     silc_utf8_encode(buf, strlen(buf), SILC_STRING_ASCII, buffer->data + 1,
3031                      buffer->len - 1);
3032   silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
3033                           buffer->data, buffer->len, TRUE);
3034   silc_buffer_free(buffer);
3035
3036  out:
3037   silc_server_packet_queue_purge(server, sock);
3038
3039   /* Mark the connection to be disconnected */
3040   SILC_SET_DISCONNECTED(sock);
3041   silc_server_close_connection(server, sock);
3042 }
3043
3044 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
3045 {
3046   SilcServer server = app_context;
3047   SilcClientEntry client = context;
3048
3049   assert(!silc_hash_table_count(client->channels));
3050
3051   silc_idlist_del_data(client);
3052   silc_idcache_purge_by_context(server->local_list->clients, client);
3053 }
3054
3055 /* Frees client data and notifies about client's signoff. */
3056
3057 void silc_server_free_client_data(SilcServer server,
3058                                   SilcSocketConnection sock,
3059                                   SilcClientEntry client,
3060                                   int notify,
3061                                   const char *signoff)
3062 {
3063   SILC_LOG_DEBUG(("Freeing client data"));
3064
3065   /* If there is pending outgoing data for the client then purge it
3066      to the network before removing the client entry. */
3067   silc_server_packet_queue_purge(server, sock);
3068
3069   if (client->id) {
3070     /* Check if anyone is watching this nickname */
3071     if (server->server_type == SILC_ROUTER)
3072       silc_server_check_watcher_list(server, client, NULL,
3073                                      SILC_NOTIFY_TYPE_SIGNOFF);
3074
3075     /* Send SIGNOFF notify to routers. */
3076     if (notify)
3077       silc_server_send_notify_signoff(server, SILC_PRIMARY_ROUTE(server),
3078                                       SILC_BROADCAST(server), client->id,
3079                                       signoff);
3080   }
3081
3082   /* Remove client from all channels */
3083   if (notify)
3084     silc_server_remove_from_channels(server, NULL, client,
3085                                      TRUE, (char *)signoff, TRUE);
3086   else
3087     silc_server_remove_from_channels(server, NULL, client,
3088                                      FALSE, NULL, FALSE);
3089
3090   /* Remove this client from watcher list if it is */
3091   silc_server_del_from_watcher_list(server, client);
3092
3093   /* Update statistics */
3094   server->stat.my_clients--;
3095   server->stat.clients--;
3096   if (server->stat.cell_clients)
3097     server->stat.cell_clients--;
3098   SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
3099   SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
3100   silc_schedule_task_del_by_context(server->schedule, client);
3101
3102   /* We will not delete the client entry right away. We will take it
3103      into history (for WHOWAS command) for 5 minutes, unless we're
3104      shutting down server. */
3105   if (!server->server_shutdown) {
3106     silc_schedule_task_add(server->schedule, 0,
3107                            silc_server_free_client_data_timeout,
3108                            client, 300, 0,
3109                            SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
3110     client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
3111     client->data.status &= ~SILC_IDLIST_STATUS_LOCAL;
3112     client->mode = 0;
3113     client->router = NULL;
3114     client->connection = NULL;
3115   } else {
3116     /* Delete directly since we're shutting down server */
3117     silc_idlist_del_data(client);
3118     silc_idlist_del_client(server->local_list, client);
3119   }
3120 }
3121
3122 /* Frees user_data pointer from socket connection object. This also sends
3123    appropriate notify packets to the network to inform about leaving
3124    entities. */
3125
3126 void silc_server_free_sock_user_data(SilcServer server,
3127                                      SilcSocketConnection sock,
3128                                      const char *signoff_message)
3129 {
3130   switch (sock->type) {
3131   case SILC_SOCKET_TYPE_CLIENT:
3132     {
3133       SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
3134       silc_server_free_client_data(server, sock, user_data, TRUE,
3135                                    signoff_message);
3136       break;
3137     }
3138   case SILC_SOCKET_TYPE_SERVER:
3139   case SILC_SOCKET_TYPE_ROUTER:
3140     {
3141       SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
3142       SilcServerEntry backup_router = NULL;
3143
3144       SILC_LOG_DEBUG(("Freeing server data"));
3145
3146       if (user_data->id)
3147         backup_router = silc_server_backup_get(server, user_data->id);
3148
3149       if (!server->backup_router && server->server_type == SILC_ROUTER &&
3150           backup_router == server->id_entry &&
3151           sock->type != SILC_SOCKET_TYPE_ROUTER)
3152         backup_router = NULL;
3153
3154       if (server->server_shutdown || server->backup_noswitch)
3155         backup_router = NULL;
3156
3157       /* If this was our primary router connection then we're lost to
3158          the outside world. */
3159       if (server->router == user_data) {
3160         /* Check whether we have a backup router connection */
3161         if (!backup_router || backup_router == user_data) {
3162           silc_schedule_task_add(server->schedule, 0,
3163                                  silc_server_connect_to_router,
3164                                  server, 1, 0,
3165                                  SILC_TASK_TIMEOUT,
3166                                  SILC_TASK_PRI_NORMAL);
3167
3168           server->id_entry->router = NULL;
3169           server->router = NULL;
3170           server->standalone = TRUE;
3171           backup_router = NULL;
3172         } else {
3173           if (server->id_entry != backup_router) {
3174             SILC_LOG_INFO(("New primary router is backup router %s",
3175                            backup_router->server_name));
3176             server->id_entry->router = backup_router;
3177             server->router = backup_router;
3178             server->router_connect = time(0);
3179             server->backup_primary = TRUE;
3180           } else {
3181             SILC_LOG_INFO(("We are now new primary router in this cell"));
3182             server->id_entry->router = NULL;
3183             server->router = NULL;
3184             server->standalone = TRUE;
3185
3186             /* We stop here to take a breath */
3187             sleep(2);
3188           }
3189
3190           if (server->server_type == SILC_BACKUP_ROUTER) {
3191             server->server_type = SILC_ROUTER;
3192
3193             /* We'll need to constantly try to reconnect to the primary
3194                router so that we'll see when it comes back online. */
3195             silc_server_backup_reconnect(server, sock->ip, sock->port,
3196                                          silc_server_backup_connected,
3197                                          NULL);
3198           }
3199
3200           /* Mark this connection as replaced */
3201           silc_server_backup_replaced_add(server, user_data->id,
3202                                           backup_router);
3203         }
3204       } else if (backup_router) {
3205         SILC_LOG_INFO(("Enabling the use of backup router %s",
3206                        backup_router->server_name));
3207
3208         /* Mark this connection as replaced */
3209         silc_server_backup_replaced_add(server, user_data->id,
3210                                         backup_router);
3211       } else if (server->server_type == SILC_SERVER &&
3212                  sock->type == SILC_SOCKET_TYPE_ROUTER) {
3213         /* Reconnect to the router (backup) */
3214         silc_schedule_task_add(server->schedule, 0,
3215                                silc_server_connect_to_router,
3216                                server, 1, 0,
3217                                SILC_TASK_TIMEOUT,
3218                                SILC_TASK_PRI_NORMAL);
3219       }
3220
3221       if (!backup_router) {
3222         /* Remove all servers that are originated from this server, and
3223            remove the clients of those servers too. */
3224         silc_server_remove_servers_by_server(server, user_data, TRUE);
3225
3226         /* Remove the clients that this server owns as they will become
3227            invalid now too.  For backup router the server is actually
3228            coming from the primary router, so mark that as the owner
3229            of this entry. */
3230         if (server->server_type == SILC_BACKUP_ROUTER &&
3231             sock->type == SILC_SOCKET_TYPE_SERVER)
3232           silc_server_remove_clients_by_server(server, server->router,
3233                                                user_data, TRUE);
3234         else
3235           silc_server_remove_clients_by_server(server, user_data,
3236                                                user_data, TRUE);
3237
3238         /* Remove channels owned by this server */
3239         if (server->server_type == SILC_SERVER)
3240           silc_server_remove_channels_by_server(server, user_data);
3241       } else {
3242         /* Enable local server connections that may be disabled */
3243         silc_server_local_servers_toggle_enabled(server, TRUE);
3244
3245         /* Update the client entries of this server to the new backup
3246            router.  If we are the backup router we also resolve the real
3247            servers for the clients.  After updating is over this also
3248            removes the clients that this server explicitly owns. */
3249         silc_server_update_clients_by_server(server, user_data,
3250                                              backup_router, TRUE);
3251
3252         /* If we are router and just lost our primary router (now standlaone)
3253            we remove everything that was behind it, since we don't know
3254            any better. */
3255         if (server->server_type == SILC_ROUTER && server->standalone)
3256           /* Remove all servers that are originated from this server, and
3257              remove the clients of those servers too. */
3258           silc_server_remove_servers_by_server(server, user_data, TRUE);
3259
3260         /* Finally remove the clients that are explicitly owned by this
3261            server.  They go down with the server. */
3262         silc_server_remove_clients_by_server(server, user_data,
3263                                              user_data, TRUE);
3264
3265         /* Update our server cache to use the new backup router too. */
3266         silc_server_update_servers_by_server(server, user_data, backup_router);
3267         if (server->server_type == SILC_SERVER)
3268           silc_server_update_channels_by_server(server, user_data,
3269                                                 backup_router);
3270
3271         /* Send notify about primary router going down to local operators */
3272         if (server->backup_router)
3273           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3274                                  SILC_NOTIFY_TYPE_NONE,
3275                                  ("%s switched to backup router %s "
3276                                   "(we are primary router now)",
3277                                   server->server_name, server->server_name));
3278         else if (server->router)
3279           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3280                                  SILC_NOTIFY_TYPE_NONE,
3281                                  ("%s switched to backup router %s",
3282                                   server->server_name,
3283                                   server->router->server_name));
3284       }
3285       server->backup_noswitch = FALSE;
3286
3287       /* Free the server entry */
3288       silc_server_backup_del(server, user_data);
3289       silc_server_backup_replaced_del(server, user_data);
3290       silc_idlist_del_data(user_data);
3291       if (!silc_idlist_del_server(server->local_list, user_data))
3292         silc_idlist_del_server(server->global_list, user_data);
3293       if (sock->type == SILC_SOCKET_TYPE_SERVER) {
3294         server->stat.my_servers--;
3295       } else {
3296         server->stat.my_routers--;
3297         server->stat.routers--;
3298       }
3299       server->stat.servers--;
3300       if (server->server_type == SILC_ROUTER)
3301         server->stat.cell_servers--;
3302
3303       if (backup_router && backup_router != server->id_entry) {
3304         /* Announce all of our stuff that was created about 5 minutes ago.
3305            The backup router knows all the other stuff already. */
3306         if (server->server_type == SILC_ROUTER)
3307           silc_server_announce_servers(server, FALSE, time(0) - 300,
3308                                        backup_router->connection);
3309
3310         /* Announce our clients and channels to the router */
3311         silc_server_announce_clients(server, time(0) - 300,
3312                                      backup_router->connection);
3313         silc_server_announce_channels(server, time(0) - 300,
3314                                       backup_router->connection);
3315       }
3316       break;
3317     }
3318   default:
3319     {
3320       SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
3321
3322       SILC_LOG_DEBUG(("Freeing unknown connection data"));
3323
3324       silc_idlist_del_data(user_data);
3325       silc_free(user_data);
3326       break;
3327     }
3328   }
3329
3330   /* If any protocol is active cancel its execution */
3331   if (sock->protocol) {
3332     SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
3333     silc_protocol_cancel(sock->protocol, server->schedule);
3334     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3335     silc_protocol_execute_final(sock->protocol, server->schedule);
3336     sock->protocol = NULL;
3337   }
3338
3339   sock->user_data = NULL;
3340 }
3341
3342 /* Removes client from all channels it has joined. This is used when client
3343    connection is disconnected. If the client on a channel is last, the
3344    channel is removed as well. This sends the SIGNOFF notify types. */
3345
3346 void silc_server_remove_from_channels(SilcServer server,
3347                                       SilcSocketConnection sock,
3348                                       SilcClientEntry client,
3349                                       bool notify,
3350                                       const char *signoff_message,
3351                                       bool keygen)
3352 {
3353   SilcChannelEntry channel;
3354   SilcChannelClientEntry chl;
3355   SilcHashTableList htl;
3356   SilcBuffer clidp = NULL;
3357
3358   if (!client)
3359     return;
3360
3361   SILC_LOG_DEBUG(("Removing client from joined channels"));
3362
3363   if (notify && !client->id)
3364     notify = FALSE;
3365
3366   if (notify) {
3367     clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3368     if (!clidp)
3369       notify = FALSE;
3370   }
3371
3372   /* Remove the client from all channels. The client is removed from
3373      the channels' user list. */
3374   silc_hash_table_list(client->channels, &htl);
3375   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3376     channel = chl->channel;
3377
3378     /* Remove channel if this is last client leaving the channel, unless
3379        the channel is permanent. */
3380     if (server->server_type != SILC_SERVER &&
3381         silc_hash_table_count(channel->user_list) < 2) {
3382       silc_server_channel_delete(server, channel);
3383       continue;
3384     }
3385
3386     silc_hash_table_del(client->channels, channel);
3387     silc_hash_table_del(channel->user_list, client);
3388     channel->user_count--;
3389
3390     /* If there is no global users on the channel anymore mark the channel
3391        as local channel. Do not check if the removed client is local client. */
3392     if (server->server_type == SILC_SERVER && channel->global_users &&
3393         chl->client->router && !silc_server_channel_has_global(channel))
3394       channel->global_users = FALSE;
3395
3396     memset(chl, 'A', sizeof(*chl));
3397     silc_free(chl);
3398
3399     /* Update statistics */
3400     if (SILC_IS_LOCAL(client))
3401       server->stat.my_chanclients--;
3402     if (server->server_type == SILC_ROUTER) {
3403       server->stat.cell_chanclients--;
3404       server->stat.chanclients--;
3405     }
3406
3407     /* If there is not at least one local user on the channel then we don't
3408        need the channel entry anymore, we can remove it safely, unless the
3409        channel is permanent channel */
3410     if (server->server_type == SILC_SERVER &&
3411         !silc_server_channel_has_local(channel)) {
3412       /* Notify about leaving client if this channel has global users. */
3413       if (notify && channel->global_users)
3414         silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3415                                            SILC_NOTIFY_TYPE_SIGNOFF,
3416                                            signoff_message ? 2 : 1,
3417                                            clidp->data, clidp->len,
3418                                            signoff_message, signoff_message ?
3419                                            strlen(signoff_message) : 0);
3420
3421       silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3422       silc_server_channel_delete(server, channel);
3423       continue;
3424     }
3425
3426     /* Send notify to channel about client leaving SILC and channel too */
3427     if (notify)
3428       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3429                                          SILC_NOTIFY_TYPE_SIGNOFF,
3430                                          signoff_message ? 2 : 1,
3431                                          clidp->data, clidp->len,
3432                                          signoff_message, signoff_message ?
3433                                          strlen(signoff_message) : 0);
3434
3435     /* Don't create keys if we are shutting down */
3436     if (server->server_shutdown)
3437       continue;
3438
3439     /* Re-generate channel key if needed */
3440     if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
3441       if (!silc_server_create_channel_key(server, channel, 0))
3442         continue;
3443
3444       /* Send the channel key to the channel. The key of course is not sent
3445          to the client who was removed from the channel. */
3446       silc_server_send_channel_key(server, client->connection, channel,
3447                                    server->server_type == SILC_ROUTER ?
3448                                    FALSE : !server->standalone);
3449     }
3450   }
3451
3452   silc_hash_table_list_reset(&htl);
3453   if (clidp)
3454     silc_buffer_free(clidp);
3455 }
3456
3457 /* Removes client from one channel. This is used for example when client
3458    calls LEAVE command to remove itself from the channel. Returns TRUE
3459    if channel still exists and FALSE if the channel is removed when
3460    last client leaves the channel. If `notify' is FALSE notify messages
3461    are not sent. */
3462
3463 bool silc_server_remove_from_one_channel(SilcServer server,
3464                                          SilcSocketConnection sock,
3465                                          SilcChannelEntry channel,
3466                                          SilcClientEntry client,
3467                                          bool notify)
3468 {
3469   SilcChannelClientEntry chl;
3470   SilcBuffer clidp;
3471
3472   SILC_LOG_DEBUG(("Removing %s from channel %s",
3473                   silc_id_render(client->id, SILC_ID_CLIENT),
3474                   channel->channel_name));
3475
3476   /* Get the entry to the channel, if this client is not on the channel
3477      then return Ok. */
3478   if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
3479     return TRUE;
3480
3481   /* Remove channel if this is last client leaving the channel, unless
3482      the channel is permanent. */
3483   if (server->server_type != SILC_SERVER &&
3484       silc_hash_table_count(channel->user_list) < 2) {
3485     silc_server_channel_delete(server, channel);
3486     return FALSE;
3487   }
3488
3489   silc_hash_table_del(client->channels, channel);
3490   silc_hash_table_del(channel->user_list, client);
3491   channel->user_count--;
3492
3493   /* If there is no global users on the channel anymore mark the channel
3494      as local channel. Do not check if the client is local client. */
3495   if (server->server_type == SILC_SERVER && channel->global_users &&
3496       chl->client->router && !silc_server_channel_has_global(channel))
3497     channel->global_users = FALSE;
3498
3499   memset(chl, 'O', sizeof(*chl));
3500   silc_free(chl);
3501
3502   /* Update statistics */
3503   if (SILC_IS_LOCAL(client))
3504     server->stat.my_chanclients--;
3505   if (server->server_type == SILC_ROUTER) {
3506     server->stat.cell_chanclients--;
3507     server->stat.chanclients--;
3508   }
3509
3510   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3511   if (!clidp)
3512     notify = FALSE;
3513
3514   /* If there is not at least one local user on the channel then we don't
3515      need the channel entry anymore, we can remove it safely, unless the
3516      channel is permanent channel */
3517   if (server->server_type == SILC_SERVER &&
3518       !silc_server_channel_has_local(channel)) {
3519     /* Notify about leaving client if this channel has global users. */
3520     if (notify && channel->global_users)
3521       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3522                                          SILC_NOTIFY_TYPE_LEAVE, 1,
3523                                          clidp->data, clidp->len);
3524
3525     silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3526     silc_server_channel_delete(server, channel);
3527     silc_buffer_free(clidp);
3528     return FALSE;
3529   }
3530
3531   /* Send notify to channel about client leaving the channel */
3532   if (notify)
3533     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3534                                        SILC_NOTIFY_TYPE_LEAVE, 1,
3535                                        clidp->data, clidp->len);
3536
3537   silc_buffer_free(clidp);
3538   return TRUE;
3539 }
3540
3541 /* Timeout callback. This is called if connection is idle or for some
3542    other reason is not responding within some period of time. This
3543    disconnects the remote end. */
3544
3545 SILC_TASK_CALLBACK(silc_server_timeout_remote)
3546 {
3547   SilcServer server = (SilcServer)context;
3548   SilcSocketConnection sock = server->sockets[fd];
3549   SilcProtocolType protocol = 0;
3550
3551   SILC_LOG_DEBUG(("Start"));
3552
3553   if (!sock)
3554     return;
3555
3556   SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
3557                   sock->hostname, sock->ip));
3558
3559   /* If we have protocol active we must assure that we call the protocol's
3560      final callback so that all the memory is freed. */
3561   if (sock->protocol) {
3562     protocol = sock->protocol->protocol->type;
3563     silc_protocol_cancel(sock->protocol, server->schedule);
3564     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3565     silc_protocol_execute_final(sock->protocol, server->schedule);
3566     sock->protocol = NULL;
3567     return;
3568   }
3569
3570   silc_server_disconnect_remote(server, sock,
3571                                 protocol ==
3572                                 SILC_PROTOCOL_SERVER_CONNECTION_AUTH ?
3573                                 SILC_STATUS_ERR_AUTH_FAILED :
3574                                 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
3575                                 "Connection timeout");
3576
3577   if (sock->user_data)
3578     silc_server_free_sock_user_data(server, sock, NULL);
3579 }
3580
3581 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
3582    function may be used only by router. In real SILC network all channels
3583    are created by routers thus this function is never used by normal
3584    server. */
3585
3586 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
3587                                                 SilcServerID *router_id,
3588                                                 char *cipher,
3589                                                 char *hmac,
3590                                                 char *channel_name,
3591                                                 int broadcast)
3592 {
3593   SilcChannelID *channel_id;
3594   SilcChannelEntry entry;
3595   SilcCipher key;
3596   SilcHmac newhmac;
3597
3598   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3599
3600   if (!cipher)
3601     cipher = SILC_DEFAULT_CIPHER;
3602   if (!hmac)
3603     hmac = SILC_DEFAULT_HMAC;
3604
3605   /* Allocate cipher */
3606   if (!silc_cipher_alloc(cipher, &key))
3607     return NULL;
3608
3609   /* Allocate hmac */
3610   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3611     silc_cipher_free(key);
3612     return NULL;
3613   }
3614
3615   channel_name = strdup(channel_name);
3616
3617   /* Create the channel ID */
3618   if (!silc_id_create_channel_id(server, router_id, server->rng,
3619                                  &channel_id)) {
3620     silc_free(channel_name);
3621     silc_cipher_free(key);
3622     silc_hmac_free(newhmac);
3623     return NULL;
3624   }
3625
3626   /* Create the channel */
3627   entry = silc_idlist_add_channel(server->local_list, channel_name,
3628                                   SILC_CHANNEL_MODE_NONE, channel_id,
3629                                   NULL, key, newhmac, 0);
3630   if (!entry) {
3631     silc_free(channel_name);
3632     silc_cipher_free(key);
3633     silc_hmac_free(newhmac);
3634     silc_free(channel_id);
3635     return NULL;
3636   }
3637
3638   entry->cipher = strdup(cipher);
3639   entry->hmac_name = strdup(hmac);
3640
3641   /* Now create the actual key material */
3642   if (!silc_server_create_channel_key(server, entry,
3643                                       silc_cipher_get_key_len(key) / 8)) {
3644     silc_idlist_del_channel(server->local_list, entry);
3645     return NULL;
3646   }
3647
3648   /* Notify other routers about the new channel. We send the packet
3649      to our primary route. */
3650   if (broadcast)
3651     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3652                                  channel_name, entry->id,
3653                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3654                                  entry->mode);
3655
3656   /* Distribute to backup routers */
3657   if (broadcast && server->server_type == SILC_ROUTER) {
3658     SilcBuffer packet;
3659     unsigned char *cid;
3660     SilcUInt32 name_len = strlen(channel_name);
3661     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3662     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3663
3664     packet = silc_channel_payload_encode(channel_name, name_len,
3665                                          cid, channel_id_len, entry->mode);
3666     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3667                             packet->data, packet->len, FALSE, TRUE);
3668     silc_free(cid);
3669     silc_buffer_free(packet);
3670   }
3671
3672   server->stat.my_channels++;
3673   if (server->server_type == SILC_ROUTER) {
3674     server->stat.channels++;
3675     server->stat.cell_channels++;
3676     entry->users_resolved = TRUE;
3677   }
3678
3679   return entry;
3680 }
3681
3682 /* Same as above but creates the channel with Channel ID `channel_id. */
3683
3684 SilcChannelEntry
3685 silc_server_create_new_channel_with_id(SilcServer server,
3686                                        char *cipher,
3687                                        char *hmac,
3688                                        char *channel_name,
3689                                        SilcChannelID *channel_id,
3690                                        int broadcast)
3691 {
3692   SilcChannelEntry entry;
3693   SilcCipher key;
3694   SilcHmac newhmac;
3695
3696   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3697
3698   if (!cipher)
3699     cipher = SILC_DEFAULT_CIPHER;
3700   if (!hmac)
3701     hmac = SILC_DEFAULT_HMAC;
3702
3703   /* Allocate cipher */
3704   if (!silc_cipher_alloc(cipher, &key))
3705     return NULL;
3706
3707   /* Allocate hmac */
3708   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3709     silc_cipher_free(key);
3710     return NULL;
3711   }
3712
3713   channel_name = strdup(channel_name);
3714
3715   /* Create the channel */
3716   entry = silc_idlist_add_channel(server->local_list, channel_name,
3717                                   SILC_CHANNEL_MODE_NONE, channel_id,
3718                                   NULL, key, newhmac, 0);
3719   if (!entry) {
3720     silc_cipher_free(key);
3721     silc_hmac_free(newhmac);
3722     silc_free(channel_name);
3723     return NULL;
3724   }
3725
3726   /* Now create the actual key material */
3727   if (!silc_server_create_channel_key(server, entry,
3728                                       silc_cipher_get_key_len(key) / 8)) {
3729     silc_idlist_del_channel(server->local_list, entry);
3730     return NULL;
3731   }
3732
3733   /* Notify other routers about the new channel. We send the packet
3734      to our primary route. */
3735   if (broadcast)
3736     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3737                                  channel_name, entry->id,
3738                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3739                                  entry->mode);
3740
3741   /* Distribute to backup routers */
3742   if (broadcast && server->server_type == SILC_ROUTER) {
3743     SilcBuffer packet;
3744     unsigned char *cid;
3745     SilcUInt32 name_len = strlen(channel_name);
3746     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3747     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3748
3749     packet = silc_channel_payload_encode(channel_name, name_len,
3750                                          cid, channel_id_len, entry->mode);
3751     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3752                             packet->data, packet->len, FALSE, TRUE);
3753     silc_free(cid);
3754     silc_buffer_free(packet);
3755   }
3756
3757   server->stat.my_channels++;
3758   if (server->server_type == SILC_ROUTER) {
3759     server->stat.channels++;
3760     server->stat.cell_channels++;
3761     entry->users_resolved = TRUE;
3762   }
3763
3764   return entry;
3765 }
3766
3767 /* Channel's key re-key timeout callback. */
3768
3769 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3770 {
3771   SilcServer server = app_context;
3772   SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3773
3774   rekey->task = NULL;
3775
3776   /* Return now if we are shutting down */
3777   if (server->server_shutdown)
3778     return;
3779
3780   if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3781     return;
3782
3783   silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3784 }
3785
3786 /* Generates new channel key. This is used to create the initial channel key
3787    but also to re-generate new key for channel. If `key_len' is provided
3788    it is the bytes of the key length. */
3789
3790 bool silc_server_create_channel_key(SilcServer server,
3791                                     SilcChannelEntry channel,
3792                                     SilcUInt32 key_len)
3793 {
3794   int i;
3795   unsigned char channel_key[32], hash[32];
3796   SilcUInt32 len;
3797
3798   if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3799     SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3800     return TRUE;
3801   }
3802
3803   SILC_LOG_DEBUG(("Generating channel %s key", channel->channel_name));
3804
3805   if (!channel->channel_key)
3806     if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3807       channel->channel_key = NULL;
3808       return FALSE;
3809     }
3810
3811   if (key_len)
3812     len = key_len;
3813   else if (channel->key_len)
3814     len = channel->key_len / 8;
3815   else
3816     len = silc_cipher_get_key_len(channel->channel_key) / 8;
3817
3818   /* Create channel key */
3819   for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3820
3821   /* Set the key */
3822   silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3823
3824   /* Remove old key if exists */
3825   if (channel->key) {
3826     memset(channel->key, 0, channel->key_len / 8);
3827     silc_free(channel->key);
3828   }
3829
3830   /* Save the key */
3831   channel->key_len = len * 8;
3832   channel->key = silc_memdup(channel_key, len);
3833   memset(channel_key, 0, sizeof(channel_key));
3834
3835   /* Generate HMAC key from the channel key data and set it */
3836   if (!channel->hmac)
3837     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3838   silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3839   silc_hmac_set_key(channel->hmac, hash,
3840                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3841   memset(hash, 0, sizeof(hash));
3842
3843   if (server->server_type == SILC_ROUTER) {
3844     if (!channel->rekey)
3845       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3846     channel->rekey->channel = channel;
3847     channel->rekey->key_len = key_len;
3848     if (channel->rekey->task)
3849       silc_schedule_task_del(server->schedule, channel->rekey->task);
3850
3851     channel->rekey->task =
3852       silc_schedule_task_add(server->schedule, 0,
3853                              silc_server_channel_key_rekey,
3854                              (void *)channel->rekey,
3855                              server->config->channel_rekey_secs, 0,
3856                              SILC_TASK_TIMEOUT,
3857                              SILC_TASK_PRI_NORMAL);
3858   }
3859
3860   return TRUE;
3861 }
3862
3863 /* Saves the channel key found in the encoded `key_payload' buffer. This
3864    function is used when we receive Channel Key Payload and also when we're
3865    processing JOIN command reply. Returns entry to the channel. */
3866
3867 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3868                                               SilcBuffer key_payload,
3869                                               SilcChannelEntry channel)
3870 {
3871   SilcChannelKeyPayload payload = NULL;
3872   SilcChannelID *id = NULL;
3873   unsigned char *tmp, hash[32];
3874   SilcUInt32 tmp_len;
3875   char *cipher;
3876
3877   /* Decode channel key payload */
3878   payload = silc_channel_key_payload_parse(key_payload->data,
3879                                            key_payload->len);
3880   if (!payload) {
3881     SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3882     channel = NULL;
3883     goto out;
3884   }
3885
3886   /* Get the channel entry */
3887   if (!channel) {
3888
3889     /* Get channel ID */
3890     tmp = silc_channel_key_get_id(payload, &tmp_len);
3891     id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3892     if (!id) {
3893       channel = NULL;
3894       goto out;
3895     }
3896
3897     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3898     if (!channel) {
3899       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3900       if (!channel) {
3901         if (server->server_type == SILC_ROUTER)
3902           SILC_LOG_ERROR(("Received key for non-existent channel %s",
3903                           silc_id_render(id, SILC_ID_CHANNEL)));
3904         goto out;
3905       }
3906     }
3907   }
3908
3909   SILC_LOG_DEBUG(("Saving new channel %s key", channel->channel_name));
3910
3911   tmp = silc_channel_key_get_key(payload, &tmp_len);
3912   if (!tmp) {
3913     channel = NULL;
3914     goto out;
3915   }
3916
3917   cipher = silc_channel_key_get_cipher(payload, NULL);
3918   if (!cipher) {
3919     channel = NULL;
3920     goto out;
3921   }
3922
3923   /* Remove old key if exists */
3924   if (channel->key) {
3925     memset(channel->key, 0, channel->key_len / 8);
3926     silc_free(channel->key);
3927     silc_cipher_free(channel->channel_key);
3928   }
3929
3930   /* Create new cipher */
3931   if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3932     channel->channel_key = NULL;
3933     channel = NULL;
3934     goto out;
3935   }
3936
3937   if (channel->cipher)
3938     silc_free(channel->cipher);
3939   channel->cipher = strdup(cipher);
3940
3941   /* Save the key */
3942   channel->key_len = tmp_len * 8;
3943   channel->key = silc_memdup(tmp, tmp_len);
3944   silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3945
3946   /* Generate HMAC key from the channel key data and set it */
3947   if (!channel->hmac)
3948     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3949   silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3950   silc_hmac_set_key(channel->hmac, hash,
3951                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3952
3953   memset(hash, 0, sizeof(hash));
3954   memset(tmp, 0, tmp_len);
3955
3956   if (server->server_type == SILC_ROUTER) {
3957     if (!channel->rekey)
3958       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3959     channel->rekey->channel = channel;
3960     if (channel->rekey->task)
3961       silc_schedule_task_del(server->schedule, channel->rekey->task);
3962
3963     channel->rekey->task =
3964       silc_schedule_task_add(server->schedule, 0,
3965                              silc_server_channel_key_rekey,
3966                              (void *)channel->rekey,
3967                              server->config->channel_rekey_secs, 0,
3968                              SILC_TASK_TIMEOUT,
3969                              SILC_TASK_PRI_NORMAL);
3970   }
3971
3972  out:
3973   silc_free(id);
3974   if (payload)
3975     silc_channel_key_payload_free(payload);
3976
3977   return channel;
3978 }
3979
3980 /* Heartbeat callback. This function is set as argument for the
3981    silc_socket_set_heartbeat function. The library will call this function
3982    at the set time interval. */
3983
3984 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3985                                    void *hb_context)
3986 {
3987   SilcServer server = hb_context;
3988
3989   SILC_LOG_DEBUG(("Sending heartbeat to %s:%d (%s)", sock->hostname,
3990                  sock->port, sock->ip));
3991
3992   /* Send the heartbeat */
3993   silc_server_send_heartbeat(server, sock);
3994 }
3995
3996 /* Returns assembled of all servers in the given ID list. The packet's
3997    form is dictated by the New ID payload. */
3998
3999 static void silc_server_announce_get_servers(SilcServer server,
4000                                              SilcServerEntry remote,
4001                                              SilcIDList id_list,
4002                                              SilcBuffer *servers,
4003                                              unsigned long creation_time)
4004 {
4005   SilcIDCacheList list;
4006   SilcIDCacheEntry id_cache;
4007   SilcServerEntry entry;
4008   SilcBuffer idp;
4009
4010   /* Go through all clients in the list */
4011   if (silc_idcache_get_all(id_list->servers, &list)) {
4012     if (silc_idcache_list_first(list, &id_cache)) {
4013       while (id_cache) {
4014         entry = (SilcServerEntry)id_cache->context;
4015
4016         /* Do not announce the one we've sending our announcements and
4017            do not announce ourself. Also check the creation time if it's
4018            provided. */
4019         if ((entry == remote) || (entry == server->id_entry) ||
4020             (creation_time && entry->data.created < creation_time)) {
4021           if (!silc_idcache_list_next(list, &id_cache))
4022             break;
4023           continue;
4024         }
4025
4026         idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
4027
4028         *servers = silc_buffer_realloc(*servers,
4029                                        (*servers ?
4030                                         (*servers)->truelen + idp->len :
4031                                         idp->len));
4032         silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
4033         silc_buffer_put(*servers, idp->data, idp->len);
4034         silc_buffer_pull(*servers, idp->len);
4035         silc_buffer_free(idp);
4036
4037         if (!silc_idcache_list_next(list, &id_cache))
4038           break;
4039       }
4040     }
4041
4042     silc_idcache_list_free(list);
4043   }
4044 }
4045
4046 static SilcBuffer
4047 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
4048 {
4049   va_list ap;
4050   SilcBuffer p;
4051
4052   va_start(ap, argc);
4053   p = silc_notify_payload_encode(notify, argc, ap);
4054   va_end(ap);
4055
4056   return p;
4057 }
4058
4059 /* This function is used by router to announce existing servers to our
4060    primary router when we've connected to it. If `creation_time' is non-zero
4061    then only the servers that has been created after the `creation_time'
4062    will be announced. */
4063
4064 void silc_server_announce_servers(SilcServer server, bool global,
4065                                   unsigned long creation_time,
4066                                   SilcSocketConnection remote)
4067 {
4068   SilcBuffer servers = NULL;
4069
4070   SILC_LOG_DEBUG(("Announcing servers"));
4071
4072   /* Get servers in local list */
4073   silc_server_announce_get_servers(server, remote->user_data,
4074                                    server->local_list, &servers,
4075                                    creation_time);
4076
4077   if (global)
4078     /* Get servers in global list */
4079     silc_server_announce_get_servers(server, remote->user_data,
4080                                      server->global_list, &servers,
4081                                      creation_time);
4082
4083   if (servers) {
4084     silc_buffer_push(servers, servers->data - servers->head);
4085     SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
4086
4087     /* Send the packet */
4088     silc_server_packet_send(server, remote,
4089                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4090                             servers->data, servers->len, TRUE);
4091
4092     silc_buffer_free(servers);
4093   }
4094 }
4095
4096 /* Returns assembled packet of all clients in the given ID list. The
4097    packet's form is dictated by the New ID Payload. */
4098
4099 static void silc_server_announce_get_clients(SilcServer server,
4100                                              SilcIDList id_list,
4101                                              SilcBuffer *clients,
4102                                              SilcBuffer *umodes,
4103                                              unsigned long creation_time)
4104 {
4105   SilcIDCacheList list;
4106   SilcIDCacheEntry id_cache;
4107   SilcClientEntry client;
4108   SilcBuffer idp;
4109   SilcBuffer tmp;
4110   unsigned char mode[4];
4111
4112   /* Go through all clients in the list */
4113   if (silc_idcache_get_all(id_list->clients, &list)) {
4114     if (silc_idcache_list_first(list, &id_cache)) {
4115       while (id_cache) {
4116         client = (SilcClientEntry)id_cache->context;
4117
4118         if (creation_time && client->data.created < creation_time) {
4119           if (!silc_idcache_list_next(list, &id_cache))
4120             break;
4121           continue;
4122         }
4123         if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED) &&
4124             !client->connection && !client->router && !SILC_IS_LOCAL(client)) {
4125           if (!silc_idcache_list_next(list, &id_cache))
4126             break;
4127           continue;
4128         }
4129
4130         idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4131
4132         *clients = silc_buffer_realloc(*clients,
4133                                        (*clients ?
4134                                         (*clients)->truelen + idp->len :
4135                                         idp->len));
4136         silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
4137         silc_buffer_put(*clients, idp->data, idp->len);
4138         silc_buffer_pull(*clients, idp->len);
4139
4140         SILC_PUT32_MSB(client->mode, mode);
4141         tmp =
4142           silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
4143                                              2, idp->data, idp->len,
4144                                              mode, 4);
4145         *umodes = silc_buffer_realloc(*umodes,
4146                                       (*umodes ?
4147                                        (*umodes)->truelen + tmp->len :
4148                                        tmp->len));
4149         silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
4150         silc_buffer_put(*umodes, tmp->data, tmp->len);
4151         silc_buffer_pull(*umodes, tmp->len);
4152         silc_buffer_free(tmp);
4153
4154         silc_buffer_free(idp);
4155
4156         if (!silc_idcache_list_next(list, &id_cache))
4157           break;
4158       }
4159     }
4160
4161     silc_idcache_list_free(list);
4162   }
4163 }
4164
4165 /* This function is used to announce our existing clients to our router
4166    when we've connected to it. If `creation_time' is non-zero then only
4167    the clients that has been created after the `creation_time' will be
4168    announced. */
4169
4170 void silc_server_announce_clients(SilcServer server,
4171                                   unsigned long creation_time,
4172                                   SilcSocketConnection remote)
4173 {
4174   SilcBuffer clients = NULL;
4175   SilcBuffer umodes = NULL;
4176
4177   SILC_LOG_DEBUG(("Announcing clients"));
4178
4179   /* Get clients in local list */
4180   silc_server_announce_get_clients(server, server->local_list,
4181                                    &clients, &umodes, creation_time);
4182
4183   /* As router we announce our global list as well */
4184   if (server->server_type == SILC_ROUTER)
4185     silc_server_announce_get_clients(server, server->global_list,
4186                                      &clients, &umodes, creation_time);
4187
4188   if (clients) {
4189     silc_buffer_push(clients, clients->data - clients->head);
4190     SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
4191
4192     /* Send the packet */
4193     silc_server_packet_send(server, remote,
4194                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4195                             clients->data, clients->len, TRUE);
4196
4197     silc_buffer_free(clients);
4198   }
4199
4200   if (umodes) {
4201     silc_buffer_push(umodes, umodes->data - umodes->head);
4202     SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
4203
4204     /* Send the packet */
4205     silc_server_packet_send(server, remote,
4206                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4207                             umodes->data, umodes->len, TRUE);
4208
4209     silc_buffer_free(umodes);
4210   }
4211 }
4212
4213 /* Returns channel's topic for announcing it */
4214
4215 void silc_server_announce_get_channel_topic(SilcServer server,
4216                                             SilcChannelEntry channel,
4217                                             SilcBuffer *topic)
4218 {
4219   SilcBuffer chidp;
4220
4221   if (channel->topic) {
4222     chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4223     *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
4224                                                 chidp->data, chidp->len,
4225                                                 channel->topic,
4226                                                 strlen(channel->topic));
4227     silc_buffer_free(chidp);
4228   }
4229 }
4230
4231 /* Returns assembled packets for channel users of the `channel'. */
4232
4233 void silc_server_announce_get_channel_users(SilcServer server,
4234                                             SilcChannelEntry channel,
4235                                             SilcBuffer *channel_modes,
4236                                             SilcBuffer *channel_users,
4237                                             SilcBuffer *channel_users_modes)
4238 {
4239   SilcChannelClientEntry chl;
4240   SilcHashTableList htl;
4241   SilcBuffer chidp, clidp, csidp;
4242   SilcBuffer tmp, fkey = NULL;
4243   int len;
4244   unsigned char mode[4];
4245   char *hmac;
4246
4247   SILC_LOG_DEBUG(("Start"));
4248
4249   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4250   csidp = silc_id_payload_encode(server->id, SILC_ID_SERVER);
4251
4252   /* CMODE notify */
4253   SILC_PUT32_MSB(channel->mode, mode);
4254   hmac = channel->hmac ? (char *)silc_hmac_get_name(channel->hmac) : NULL;
4255   if (channel->founder_key)
4256     fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4257   tmp =
4258     silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CMODE_CHANGE,
4259                                        6, csidp->data, csidp->len,
4260                                        mode, sizeof(mode),
4261                                        NULL, 0,
4262                                        hmac, hmac ? strlen(hmac) : 0,
4263                                        channel->passphrase,
4264                                        channel->passphrase ?
4265                                        strlen(channel->passphrase) : 0,
4266                                        fkey ? fkey->data : NULL,
4267                                        fkey ? fkey->len : 0);
4268   len = tmp->len;
4269   *channel_modes =
4270     silc_buffer_realloc(*channel_modes,
4271                         (*channel_modes ?
4272                          (*channel_modes)->truelen + len : len));
4273   silc_buffer_pull_tail(*channel_modes,
4274                         ((*channel_modes)->end -
4275                          (*channel_modes)->data));
4276   silc_buffer_put(*channel_modes, tmp->data, tmp->len);
4277   silc_buffer_pull(*channel_modes, len);
4278   silc_buffer_free(tmp);
4279   silc_buffer_free(fkey);
4280   fkey = NULL;
4281
4282   /* Now find all users on the channel */
4283   silc_hash_table_list(channel->user_list, &htl);
4284   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4285     clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4286
4287     /* JOIN Notify */
4288     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
4289                                              clidp->data, clidp->len,
4290                                              chidp->data, chidp->len);
4291     len = tmp->len;
4292     *channel_users =
4293       silc_buffer_realloc(*channel_users,
4294                           (*channel_users ?
4295                            (*channel_users)->truelen + len : len));
4296     silc_buffer_pull_tail(*channel_users,
4297                           ((*channel_users)->end -
4298                            (*channel_users)->data));
4299
4300     silc_buffer_put(*channel_users, tmp->data, tmp->len);
4301     silc_buffer_pull(*channel_users, len);
4302     silc_buffer_free(tmp);
4303
4304     /* CUMODE notify for mode change on the channel */
4305     SILC_PUT32_MSB(chl->mode, mode);
4306     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && channel->founder_key)
4307       fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4308     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
4309                                              4, csidp->data, csidp->len,
4310                                              mode, sizeof(mode),
4311                                              clidp->data, clidp->len,
4312                                              fkey ? fkey->data : NULL,
4313                                              fkey ? fkey->len : 0);
4314     len = tmp->len;
4315     *channel_users_modes =
4316       silc_buffer_realloc(*channel_users_modes,
4317                           (*channel_users_modes ?
4318                            (*channel_users_modes)->truelen + len : len));
4319     silc_buffer_pull_tail(*channel_users_modes,
4320                           ((*channel_users_modes)->end -
4321                            (*channel_users_modes)->data));
4322
4323     silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
4324     silc_buffer_pull(*channel_users_modes, len);
4325     silc_buffer_free(tmp);
4326     silc_buffer_free(fkey);
4327     fkey = NULL;
4328     silc_buffer_free(clidp);
4329   }
4330   silc_hash_table_list_reset(&htl);
4331   silc_buffer_free(chidp);
4332   silc_buffer_free(csidp);
4333 }
4334
4335 /* Returns assembled packets for all channels and users on those channels
4336    from the given ID List. The packets are in the form dictated by the
4337    New Channel and New Channel User payloads. */
4338
4339 void silc_server_announce_get_channels(SilcServer server,
4340                                        SilcIDList id_list,
4341                                        SilcBuffer *channels,
4342                                        SilcBuffer **channel_modes,
4343                                        SilcBuffer *channel_users,
4344                                        SilcBuffer **channel_users_modes,
4345                                        SilcUInt32 *channel_users_modes_c,
4346                                        SilcBuffer **channel_topics,
4347                                        SilcChannelID ***channel_ids,
4348                                        unsigned long creation_time)
4349 {
4350   SilcIDCacheList list;
4351   SilcIDCacheEntry id_cache;
4352   SilcChannelEntry channel;
4353   unsigned char *cid;
4354   SilcUInt32 id_len;
4355   SilcUInt16 name_len;
4356   int len;
4357   int i = *channel_users_modes_c;
4358   bool announce;
4359
4360   SILC_LOG_DEBUG(("Start"));
4361
4362   /* Go through all channels in the list */
4363   if (silc_idcache_get_all(id_list->channels, &list)) {
4364     if (silc_idcache_list_first(list, &id_cache)) {
4365       while (id_cache) {
4366         channel = (SilcChannelEntry)id_cache->context;
4367
4368         if (creation_time && channel->created < creation_time)
4369           announce = FALSE;
4370         else
4371           announce = TRUE;
4372
4373         cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4374         id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4375         name_len = strlen(channel->channel_name);
4376
4377         if (announce) {
4378           len = 4 + name_len + id_len + 4;
4379           *channels =
4380             silc_buffer_realloc(*channels,
4381                                 (*channels ? (*channels)->truelen +
4382                                  len : len));
4383           silc_buffer_pull_tail(*channels,
4384                                 ((*channels)->end - (*channels)->data));
4385           silc_buffer_format(*channels,
4386                              SILC_STR_UI_SHORT(name_len),
4387                              SILC_STR_UI_XNSTRING(channel->channel_name,
4388                                                   name_len),
4389                              SILC_STR_UI_SHORT(id_len),
4390                              SILC_STR_UI_XNSTRING(cid, id_len),
4391                              SILC_STR_UI_INT(channel->mode),
4392                              SILC_STR_END);
4393           silc_buffer_pull(*channels, len);
4394         }
4395
4396         if (creation_time && channel->updated < creation_time)
4397           announce = FALSE;
4398         else
4399           announce = TRUE;
4400
4401         if (announce) {
4402           /* Channel user modes */
4403           *channel_users_modes = silc_realloc(*channel_users_modes,
4404                                               sizeof(**channel_users_modes) *
4405                                               (i + 1));
4406           (*channel_users_modes)[i] = NULL;
4407           *channel_modes = silc_realloc(*channel_modes,
4408                                         sizeof(**channel_modes) * (i + 1));
4409           (*channel_modes)[i] = NULL;
4410           *channel_ids = silc_realloc(*channel_ids,
4411                                       sizeof(**channel_ids) * (i + 1));
4412           (*channel_ids)[i] = NULL;
4413           silc_server_announce_get_channel_users(server, channel,
4414                                                  &(*channel_modes)[i],
4415                                                  channel_users,
4416                                                  &(*channel_users_modes)[i]);
4417           (*channel_ids)[i] = channel->id;
4418
4419           /* Channel's topic */
4420           *channel_topics = silc_realloc(*channel_topics,
4421                                          sizeof(**channel_topics) * (i + 1));
4422           (*channel_topics)[i] = NULL;
4423           silc_server_announce_get_channel_topic(server, channel,
4424                                                  &(*channel_topics)[i]);
4425           (*channel_users_modes_c)++;
4426
4427           silc_free(cid);
4428
4429           i++;
4430         }
4431
4432         if (!silc_idcache_list_next(list, &id_cache))
4433           break;
4434       }
4435     }
4436
4437     silc_idcache_list_free(list);
4438   }
4439 }
4440
4441 /* This function is used to announce our existing channels to our router
4442    when we've connected to it. This also announces the users on the
4443    channels to the router. If the `creation_time' is non-zero only the
4444    channels that was created after the `creation_time' are announced.
4445    Note that the channel users are still announced even if the `creation_time'
4446    was provided. */
4447
4448 void silc_server_announce_channels(SilcServer server,
4449                                    unsigned long creation_time,
4450                                    SilcSocketConnection remote)
4451 {
4452   SilcBuffer channels = NULL, *channel_modes = NULL, channel_users = NULL;
4453   SilcBuffer *channel_users_modes = NULL;
4454   SilcBuffer *channel_topics = NULL;
4455   SilcUInt32 channel_users_modes_c = 0;
4456   SilcChannelID **channel_ids = NULL;
4457
4458   SILC_LOG_DEBUG(("Announcing channels and channel users"));
4459
4460   /* Get channels and channel users in local list */
4461   silc_server_announce_get_channels(server, server->local_list,
4462                                     &channels, &channel_modes,
4463                                     &channel_users,
4464                                     &channel_users_modes,
4465                                     &channel_users_modes_c,
4466                                     &channel_topics,
4467                                     &channel_ids, creation_time);
4468
4469   /* Get channels and channel users in global list */
4470   if (server->server_type != SILC_SERVER)
4471     silc_server_announce_get_channels(server, server->global_list,
4472                                       &channels, &channel_modes,
4473                                       &channel_users,
4474                                       &channel_users_modes,
4475                                       &channel_users_modes_c,
4476                                       &channel_topics,
4477                                       &channel_ids, creation_time);
4478
4479   if (channels) {
4480     silc_buffer_push(channels, channels->data - channels->head);
4481     SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
4482
4483     /* Send the packet */
4484     silc_server_packet_send(server, remote,
4485                             SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
4486                             channels->data, channels->len,
4487                             FALSE);
4488
4489     silc_buffer_free(channels);
4490   }
4491
4492   if (channel_users) {
4493     silc_buffer_push(channel_users, channel_users->data - channel_users->head);
4494     SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
4495                      channel_users->len);
4496
4497     /* Send the packet */
4498     silc_server_packet_send(server, remote,
4499                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4500                             channel_users->data, channel_users->len,
4501                             FALSE);
4502
4503     silc_buffer_free(channel_users);
4504   }
4505
4506   if (channel_modes) {
4507     int i;
4508
4509     for (i = 0; i < channel_users_modes_c; i++) {
4510       if (!channel_modes[i])
4511         continue;
4512       silc_buffer_push(channel_modes[i],
4513                        channel_modes[i]->data -
4514                        channel_modes[i]->head);
4515       SILC_LOG_HEXDUMP(("channel modes"), channel_modes[i]->data,
4516                        channel_modes[i]->len);
4517       silc_server_packet_send_dest(server, remote,
4518                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4519                                    channel_ids[i], SILC_ID_CHANNEL,
4520                                    channel_modes[i]->data,
4521                                    channel_modes[i]->len,
4522                                    FALSE);
4523       silc_buffer_free(channel_modes[i]);
4524     }
4525     silc_free(channel_modes);
4526   }
4527
4528   if (channel_users_modes) {
4529     int i;
4530
4531     for (i = 0; i < channel_users_modes_c; i++) {
4532       if (!channel_users_modes[i])
4533         continue;
4534       silc_buffer_push(channel_users_modes[i],
4535                        channel_users_modes[i]->data -
4536                        channel_users_modes[i]->head);
4537       SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
4538                        channel_users_modes[i]->len);
4539       silc_server_packet_send_dest(server, remote,
4540                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4541                                    channel_ids[i], SILC_ID_CHANNEL,
4542                                    channel_users_modes[i]->data,
4543                                    channel_users_modes[i]->len,
4544                                    FALSE);
4545       silc_buffer_free(channel_users_modes[i]);
4546     }
4547     silc_free(channel_users_modes);
4548   }
4549
4550   if (channel_topics) {
4551     int i;
4552
4553     for (i = 0; i < channel_users_modes_c; i++) {
4554       if (!channel_topics[i])
4555         continue;
4556
4557       silc_buffer_push(channel_topics[i],
4558                        channel_topics[i]->data -
4559                        channel_topics[i]->head);
4560       SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
4561                        channel_topics[i]->len);
4562       silc_server_packet_send_dest(server, remote,
4563                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4564                                    channel_ids[i], SILC_ID_CHANNEL,
4565                                    channel_topics[i]->data,
4566                                    channel_topics[i]->len,
4567                                    FALSE);
4568       silc_buffer_free(channel_topics[i]);
4569     }
4570     silc_free(channel_topics);
4571   }
4572
4573   silc_free(channel_ids);
4574 }
4575
4576 /* Failure timeout callback. If this is called then we will immediately
4577    process the received failure. We always process the failure with timeout
4578    since we do not want to blindly trust to received failure packets.
4579    This won't be called (the timeout is cancelled) if the failure was
4580    bogus (it is bogus if remote does not close the connection after sending
4581    the failure). */
4582
4583 SILC_TASK_CALLBACK(silc_server_failure_callback)
4584 {
4585   SilcServer server = app_context;
4586   SilcServerFailureContext f = (SilcServerFailureContext)context;
4587
4588   if (f->sock->protocol) {
4589     f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
4590     silc_protocol_execute(f->sock->protocol, server->schedule, 0, 0);
4591   }
4592
4593   silc_socket_free(f->sock);
4594   silc_free(f);
4595 }
4596
4597 /* Assembles user list and users mode list from the `channel'. */
4598
4599 bool silc_server_get_users_on_channel(SilcServer server,
4600                                       SilcChannelEntry channel,
4601                                       SilcBuffer *user_list,
4602                                       SilcBuffer *mode_list,
4603                                       SilcUInt32 *user_count)
4604 {
4605   SilcChannelClientEntry chl;
4606   SilcHashTableList htl;
4607   SilcBuffer client_id_list;
4608   SilcBuffer client_mode_list;
4609   SilcBuffer idp;
4610   SilcUInt32 list_count = 0, len = 0;
4611
4612   if (!silc_hash_table_count(channel->user_list))
4613     return FALSE;
4614
4615   silc_hash_table_list(channel->user_list, &htl);
4616   while (silc_hash_table_get(&htl, NULL, (void *)&chl))
4617     len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
4618   silc_hash_table_list_reset(&htl);
4619
4620   client_id_list = silc_buffer_alloc(len);
4621   client_mode_list =
4622     silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
4623   silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
4624   silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
4625
4626   silc_hash_table_list(channel->user_list, &htl);
4627   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4628     /* Client ID */
4629     idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4630     silc_buffer_put(client_id_list, idp->data, idp->len);
4631     silc_buffer_pull(client_id_list, idp->len);
4632     silc_buffer_free(idp);
4633
4634     /* Client's mode on channel */
4635     SILC_PUT32_MSB(chl->mode, client_mode_list->data);
4636     silc_buffer_pull(client_mode_list, 4);
4637
4638     list_count++;
4639   }
4640   silc_hash_table_list_reset(&htl);
4641   silc_buffer_push(client_id_list,
4642                    client_id_list->data - client_id_list->head);
4643   silc_buffer_push(client_mode_list,
4644                    client_mode_list->data - client_mode_list->head);
4645
4646   *user_list = client_id_list;
4647   *mode_list = client_mode_list;
4648   *user_count = list_count;
4649   return TRUE;
4650 }
4651
4652 /* Saves users and their modes to the `channel'. */
4653
4654 void silc_server_save_users_on_channel(SilcServer server,
4655                                        SilcSocketConnection sock,
4656                                        SilcChannelEntry channel,
4657                                        SilcClientID *noadd,
4658                                        SilcBuffer user_list,
4659                                        SilcBuffer mode_list,
4660                                        SilcUInt32 user_count)
4661 {
4662   int i;
4663   SilcUInt16 idp_len;
4664   SilcUInt32 mode;
4665   SilcClientID *client_id;
4666   SilcClientEntry client;
4667   SilcIDCacheEntry cache;
4668   SilcChannelClientEntry chl;
4669
4670   SILC_LOG_DEBUG(("Saving %d users on %s channel", user_count,
4671                   channel->channel_name));
4672
4673   for (i = 0; i < user_count; i++) {
4674     /* Client ID */
4675     SILC_GET16_MSB(idp_len, user_list->data + 2);
4676     idp_len += 4;
4677     client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
4678     silc_buffer_pull(user_list, idp_len);
4679     if (!client_id)
4680       continue;
4681
4682     /* Mode */
4683     SILC_GET32_MSB(mode, mode_list->data);
4684     silc_buffer_pull(mode_list, 4);
4685
4686     if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
4687       silc_free(client_id);
4688       continue;
4689     }
4690
4691     cache = NULL;
4692
4693     /* Check if we have this client cached already. */
4694     client = silc_idlist_find_client_by_id(server->local_list, client_id,
4695                                            server->server_type, &cache);
4696     if (!client)
4697       client = silc_idlist_find_client_by_id(server->global_list,
4698                                              client_id, server->server_type,
4699                                              &cache);
4700     if (!client) {
4701       /* If router did not find such Client ID in its lists then this must
4702          be bogus client or some router in the net is buggy. */
4703       if (server->server_type != SILC_SERVER) {
4704         silc_free(client_id);
4705         continue;
4706       }
4707
4708       /* We don't have that client anywhere, add it. The client is added
4709          to global list since server didn't have it in the lists so it must be
4710          global. */
4711       client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
4712                                       silc_id_dup(client_id, SILC_ID_CLIENT),
4713                                       sock->user_data, NULL, 0);
4714       if (!client) {
4715         SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
4716         silc_free(client_id);
4717         continue;
4718       }
4719
4720       client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
4721     }
4722
4723     if (cache)
4724       cache->expire = 0;
4725     silc_free(client_id);
4726
4727     if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED)) {
4728       SILC_LOG_ERROR(("Attempting to add unregistered client to channel ",
4729                       "%s", channel->channel_name));
4730       continue;
4731     }
4732
4733     if (!silc_server_client_on_channel(client, channel, &chl)) {
4734       /* Client was not on the channel, add it. */
4735       chl = silc_calloc(1, sizeof(*chl));
4736       chl->client = client;
4737       chl->mode = mode;
4738       chl->channel = channel;
4739       silc_hash_table_add(channel->user_list, chl->client, chl);
4740       silc_hash_table_add(client->channels, chl->channel, chl);
4741       channel->user_count++;
4742     } else {
4743       /* Update mode */
4744       chl->mode = mode;
4745     }
4746   }
4747 }
4748
4749 /* Saves channels and channels user modes to the `client'.  Removes
4750    the client from those channels that are not sent in the list but
4751    it has joined. */
4752
4753 void silc_server_save_user_channels(SilcServer server,
4754                                     SilcSocketConnection sock,
4755                                     SilcClientEntry client,
4756                                     SilcBuffer channels,
4757                                     SilcBuffer channels_user_modes)
4758 {
4759   SilcDList ch;
4760   SilcUInt32 *chumodes;
4761   SilcChannelPayload entry;
4762   SilcChannelEntry channel;
4763   SilcChannelID *channel_id;
4764   SilcChannelClientEntry chl;
4765   SilcHashTable ht = NULL;
4766   SilcHashTableList htl;
4767   char *name;
4768   int i = 0;
4769
4770   if (!channels || !channels_user_modes ||
4771       !(client->data.status & SILC_IDLIST_STATUS_REGISTERED))
4772     goto out;
4773
4774   ch = silc_channel_payload_parse_list(channels->data, channels->len);
4775   if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4776                                &chumodes)) {
4777     ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4778                                NULL, NULL, NULL, TRUE);
4779     silc_dlist_start(ch);
4780     while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4781       /* Check if we have this channel, and add it if we don't have it.
4782          Also add the client on the channel unless it is there already. */
4783       channel_id = silc_channel_get_id_parse(entry);
4784       channel = silc_idlist_find_channel_by_id(server->local_list,
4785                                                channel_id, NULL);
4786       if (!channel)
4787         channel = silc_idlist_find_channel_by_id(server->global_list,
4788                                                  channel_id, NULL);
4789       if (!channel) {
4790         if (server->server_type != SILC_SERVER) {
4791           silc_free(channel_id);
4792           i++;
4793           continue;
4794         }
4795
4796         /* We don't have that channel anywhere, add it. */
4797         name = silc_channel_get_name(entry, NULL);
4798         channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4799                                           channel_id, server->router,
4800                                           NULL, NULL, 0);
4801         if (!channel) {
4802           silc_free(channel_id);
4803           i++;
4804           continue;
4805         }
4806         channel_id = NULL;
4807       }
4808
4809       channel->mode = silc_channel_get_mode(entry);
4810
4811       /* Add the client on the channel */
4812       if (!silc_server_client_on_channel(client, channel, &chl)) {
4813         chl = silc_calloc(1, sizeof(*chl));
4814         chl->client = client;
4815         chl->mode = chumodes[i++];
4816         chl->channel = channel;
4817         silc_hash_table_add(channel->user_list, chl->client, chl);
4818         silc_hash_table_add(client->channels, chl->channel, chl);
4819         channel->user_count++;
4820       } else {
4821         /* Update mode */
4822         chl->mode = chumodes[i++];
4823       }
4824
4825       silc_hash_table_add(ht, channel, channel);
4826       silc_free(channel_id);
4827     }
4828     silc_channel_payload_list_free(ch);
4829     silc_free(chumodes);
4830   }
4831
4832  out:
4833   /* Go through the list again and remove client from channels that
4834      are no part of the list. */
4835   if (ht) {
4836     silc_hash_table_list(client->channels, &htl);
4837     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4838       if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4839         silc_hash_table_del(chl->channel->user_list, chl->client);
4840         silc_hash_table_del(chl->client->channels, chl->channel);
4841         silc_free(chl);
4842       }
4843     }
4844     silc_hash_table_list_reset(&htl);
4845     silc_hash_table_free(ht);
4846   } else {
4847     silc_hash_table_list(client->channels, &htl);
4848     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4849       silc_hash_table_del(chl->channel->user_list, chl->client);
4850       silc_hash_table_del(chl->client->channels, chl->channel);
4851       silc_free(chl);
4852     }
4853     silc_hash_table_list_reset(&htl);
4854   }
4855 }
4856
4857 /* Lookups route to the client indicated by the `id_data'. The connection
4858    object and internal data object is returned. Returns NULL if route
4859    could not be found to the client. If the `client_id' is specified then
4860    it is used and the `id_data' is ignored. */
4861
4862 SilcSocketConnection
4863 silc_server_get_client_route(SilcServer server,
4864                              unsigned char *id_data,
4865                              SilcUInt32 id_len,
4866                              SilcClientID *client_id,
4867                              SilcIDListData *idata,
4868                              SilcClientEntry *client_entry)
4869 {
4870   SilcClientID *id;
4871   SilcClientEntry client;
4872
4873   SILC_LOG_DEBUG(("Start"));
4874
4875   if (client_entry)
4876     *client_entry = NULL;
4877
4878   /* Decode destination Client ID */
4879   if (!client_id) {
4880     id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4881     if (!id) {
4882       SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4883       return NULL;
4884     }
4885   } else {
4886     id = silc_id_dup(client_id, SILC_ID_CLIENT);
4887   }
4888
4889   /* If the destination belongs to our server we don't have to route
4890      the packet anywhere but to send it to the local destination. */
4891   client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4892   if (client) {
4893     silc_free(id);
4894
4895     /* If we are router and the client has router then the client is in
4896        our cell but not directly connected to us. */
4897     if (server->server_type == SILC_ROUTER && client->router) {
4898       /* We are of course in this case the client's router thus the route
4899          to the client is the server who owns the client. So, we will send
4900          the packet to that server. */
4901       if (idata)
4902         *idata = (SilcIDListData)client->router;
4903       return client->router->connection;
4904     }
4905
4906     /* Seems that client really is directly connected to us */
4907     if (idata)
4908       *idata = (SilcIDListData)client;
4909     if (client_entry)
4910       *client_entry = client;
4911     return client->connection;
4912   }
4913
4914   /* Destination belongs to someone not in this server. If we are normal
4915      server our action is to send the packet to our router. */
4916   if (server->server_type != SILC_ROUTER && !server->standalone) {
4917     silc_free(id);
4918     if (idata)
4919       *idata = (SilcIDListData)server->router;
4920     return SILC_PRIMARY_ROUTE(server);
4921   }
4922
4923   /* We are router and we will perform route lookup for the destination
4924      and send the packet to fastest route. */
4925   if (server->server_type == SILC_ROUTER && !server->standalone) {
4926     /* Check first that the ID is valid */
4927     client = silc_idlist_find_client_by_id(server->global_list, id,
4928                                            TRUE, NULL);
4929     if (client) {
4930       SilcSocketConnection dst_sock;
4931
4932       dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4933
4934       silc_free(id);
4935       if (idata)
4936         *idata = (SilcIDListData)dst_sock->user_data;
4937       return dst_sock;
4938     }
4939   }
4940
4941   silc_free(id);
4942   return NULL;
4943 }
4944
4945 /* Encodes and returns channel list of channels the `client' has joined.
4946    Secret channels are not put to the list. */
4947
4948 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4949                                                SilcClientEntry client,
4950                                                bool get_private,
4951                                                bool get_secret,
4952                                                SilcBuffer *user_mode_list)
4953 {
4954   SilcBuffer buffer = NULL;
4955   SilcChannelEntry channel;
4956   SilcChannelClientEntry chl;
4957   SilcHashTableList htl;
4958   unsigned char *cid;
4959   SilcUInt32 id_len;
4960   SilcUInt16 name_len;
4961   int len;
4962
4963   if (user_mode_list)
4964     *user_mode_list = NULL;
4965
4966   silc_hash_table_list(client->channels, &htl);
4967   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4968     channel = chl->channel;
4969
4970     if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4971       continue;
4972     if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4973       continue;
4974
4975     cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4976     id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4977     name_len = strlen(channel->channel_name);
4978
4979     len = 4 + name_len + id_len + 4;
4980     buffer = silc_buffer_realloc(buffer,
4981                                  (buffer ? buffer->truelen + len : len));
4982     silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4983     silc_buffer_format(buffer,
4984                        SILC_STR_UI_SHORT(name_len),
4985                        SILC_STR_UI_XNSTRING(channel->channel_name,
4986                                             name_len),
4987                        SILC_STR_UI_SHORT(id_len),
4988                        SILC_STR_UI_XNSTRING(cid, id_len),
4989                        SILC_STR_UI_INT(chl->channel->mode),
4990                        SILC_STR_END);
4991     silc_buffer_pull(buffer, len);
4992     silc_free(cid);
4993
4994     if (user_mode_list) {
4995       *user_mode_list = silc_buffer_realloc(*user_mode_list,
4996                                             (*user_mode_list ?
4997                                              (*user_mode_list)->truelen + 4 :
4998                                              4));
4999       silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
5000                                               (*user_mode_list)->data));
5001       SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
5002       silc_buffer_pull(*user_mode_list, 4);
5003     }
5004   }
5005   silc_hash_table_list_reset(&htl);
5006
5007   if (buffer)
5008     silc_buffer_push(buffer, buffer->data - buffer->head);
5009   if (user_mode_list && *user_mode_list)
5010     silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
5011                                        (*user_mode_list)->head));
5012
5013   return buffer;
5014 }
5015
5016 /* A timeout callback for the re-key. We will be the initiator of the
5017    re-key protocol. */
5018
5019 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_callback)
5020 {
5021   SilcServer server = app_context;
5022   SilcSocketConnection sock = (SilcSocketConnection)context;
5023   SilcIDListData idata = (SilcIDListData)sock->user_data;
5024   SilcProtocol protocol;
5025   SilcServerRekeyInternalContext *proto_ctx;
5026
5027   /* Allocate internal protocol context. This is sent as context
5028      to the protocol. */
5029   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
5030   proto_ctx->server = (void *)server;
5031   proto_ctx->sock = sock;
5032   proto_ctx->responder = FALSE;
5033   proto_ctx->pfs = idata->rekey->pfs;
5034
5035   /* Perform rekey protocol. Will call the final callback after the
5036      protocol is over. */
5037   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
5038                       &protocol, proto_ctx, silc_server_rekey_final);
5039   sock->protocol = protocol;
5040
5041   /* Run the protocol */
5042   silc_protocol_execute(protocol, server->schedule, 0, 0);
5043
5044   SILC_LOG_DEBUG(("Rekey protocol completed"));
5045
5046   /* Re-register re-key timeout */
5047   silc_schedule_task_add(server->schedule, sock->sock,
5048                          silc_server_rekey_callback,
5049                          context, idata->rekey->timeout, 0,
5050                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
5051 }
5052
5053 /* The final callback for the REKEY protocol. This will actually take the
5054    new key material into use. */
5055
5056 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
5057 {
5058   SilcProtocol protocol = (SilcProtocol)context;
5059   SilcServerRekeyInternalContext *ctx =
5060     (SilcServerRekeyInternalContext *)protocol->context;
5061   SilcServer server = (SilcServer)ctx->server;
5062   SilcSocketConnection sock = ctx->sock;
5063
5064   SILC_LOG_DEBUG(("Start"));
5065
5066   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
5067       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
5068     /* Error occured during protocol */
5069     SILC_LOG_ERROR(("Error occurred during rekey protocol"));
5070     silc_protocol_cancel(protocol, server->schedule);
5071     silc_protocol_free(protocol);
5072     sock->protocol = NULL;
5073     if (ctx->packet)
5074       silc_packet_context_free(ctx->packet);
5075     if (ctx->ske)
5076       silc_ske_free(ctx->ske);
5077     silc_free(ctx);
5078     return;
5079   }
5080
5081   /* Purge the outgoing data queue to assure that all rekey packets really
5082      go to the network before we quit the protocol. */
5083   silc_server_packet_queue_purge(server, sock);
5084
5085   /* Cleanup */
5086   silc_protocol_free(protocol);
5087   sock->protocol = NULL;
5088   if (ctx->packet)
5089     silc_packet_context_free(ctx->packet);
5090   if (ctx->ske)
5091     silc_ske_free(ctx->ske);
5092   silc_free(ctx);
5093 }
5094
5095 /* Task callback used to retrieve network statistical information from
5096    router server once in a while. */
5097
5098 SILC_TASK_CALLBACK(silc_server_get_stats)
5099 {
5100   SilcServer server = (SilcServer)context;
5101   SilcBuffer idp, packet;
5102
5103   SILC_LOG_DEBUG(("Retrieving stats from router"));
5104
5105   if (!server->standalone) {
5106     idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
5107     packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
5108                                             ++server->cmd_ident, 1,
5109                                             1, idp->data, idp->len);
5110     silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
5111                             SILC_PACKET_COMMAND, 0, packet->data,
5112                             packet->len, FALSE);
5113     silc_buffer_free(packet);
5114     silc_buffer_free(idp);
5115   }
5116
5117   silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
5118                          server, 120, 0, SILC_TASK_TIMEOUT,
5119                          SILC_TASK_PRI_LOW);
5120 }