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     return;
2204   }
2205
2206   /* Packet receiving */
2207
2208   /* Read some data from connection */
2209   ret = silc_packet_receive(sock);
2210   if (ret < 0) {
2211
2212     if (ret == -1)
2213       SILC_LOG_ERROR(("Error receiving packet from connection "
2214                       "%s:%d [%s] %s", sock->hostname, sock->port,
2215                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2216                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2217                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2218                        "Router"), strerror(errno)));
2219     return;
2220   }
2221
2222   /* EOF */
2223   if (ret == 0) {
2224     SILC_LOG_DEBUG(("Read EOF"));
2225
2226     /* If connection is disconnecting already we will finally
2227        close the connection */
2228     if (SILC_IS_DISCONNECTING(sock)) {
2229       if (sock->user_data)
2230         silc_server_free_sock_user_data(server, sock, NULL);
2231       silc_server_close_connection(server, sock);
2232       return;
2233     }
2234
2235     SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
2236     SILC_SET_DISCONNECTING(sock);
2237
2238     if (sock->user_data) {
2239       char tmp[128];
2240       if (silc_socket_get_error(sock, tmp, sizeof(tmp) - 1))
2241         silc_server_free_sock_user_data(server, sock, tmp);
2242       else
2243         silc_server_free_sock_user_data(server, sock, NULL);
2244     } else if (server->router_conn && server->router_conn->sock == sock &&
2245              !server->router && server->standalone)
2246       silc_schedule_task_add(server->schedule, 0,
2247                              silc_server_connect_to_router,
2248                              server, 1, 0,
2249                              SILC_TASK_TIMEOUT,
2250                              SILC_TASK_PRI_NORMAL);
2251
2252     silc_server_close_connection(server, sock);
2253     return;
2254   }
2255
2256   /* If connection is disconnecting or disconnected we will ignore
2257      what we read. */
2258   if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
2259     SILC_LOG_DEBUG(("Ignoring read data from disconnected connection"));
2260     return;
2261   }
2262
2263   /* Get keys and stuff from ID entry */
2264   idata = (SilcIDListData)sock->user_data;
2265   if (idata) {
2266     cipher = idata->receive_key;
2267     hmac = idata->hmac_receive;
2268     sequence = idata->psn_receive;
2269   }
2270
2271   /* Process the packet. This will call the parser that will then
2272      decrypt and parse the packet. */
2273   ret = silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
2274                                     TRUE : FALSE, cipher, hmac, sequence,
2275                                     silc_server_packet_parse, server);
2276
2277   /* If processing failed the connection is closed. */
2278   if (!ret) {
2279     /* On packet processing errors we may close our primary router
2280        connection but won't become primary router if we are the backup
2281        since this is local error condition. */
2282     if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2283       server->backup_noswitch = TRUE;
2284
2285     if (sock->user_data)
2286       silc_server_free_sock_user_data(server, sock, NULL);
2287     silc_server_close_connection(server, sock);
2288   }
2289 }
2290
2291 /* Parses whole packet, received earlier. */
2292
2293 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
2294 {
2295   SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
2296   SilcServer server = (SilcServer)parse_ctx->context;
2297   SilcSocketConnection sock = parse_ctx->sock;
2298   SilcPacketContext *packet = parse_ctx->packet;
2299   SilcIDListData idata = (SilcIDListData)sock->user_data;
2300   int ret;
2301
2302   server->stat.packets_received++;
2303
2304   /* Parse the packet */
2305   if (parse_ctx->normal)
2306     ret = silc_packet_parse(packet, idata ? idata->receive_key : NULL);
2307   else
2308     ret = silc_packet_parse_special(packet, idata ? idata->receive_key : NULL);
2309
2310   /* If entry is disabled ignore what we got. */
2311   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED &&
2312       ret != SILC_PACKET_HEARTBEAT && ret != SILC_PACKET_RESUME_ROUTER &&
2313       ret != SILC_PACKET_REKEY && ret != SILC_PACKET_REKEY_DONE) {
2314     SILC_LOG_DEBUG(("Connection is disabled"));
2315     goto out;
2316   }
2317
2318   if (ret == SILC_PACKET_NONE) {
2319     SILC_LOG_DEBUG(("Error parsing packet"));
2320     goto out;
2321   }
2322
2323   /* Check that the the current client ID is same as in the client's packet. */
2324   if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
2325     SilcClientEntry client = (SilcClientEntry)sock->user_data;
2326     if (client && client->id && packet->src_id) {
2327       void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
2328                                 packet->src_id_type);
2329       if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
2330         silc_free(id);
2331         SILC_LOG_DEBUG(("Packet source is not same as sender"));
2332         goto out;
2333       }
2334       silc_free(id);
2335     }
2336   }
2337
2338   if (server->server_type == SILC_ROUTER) {
2339     /* Route the packet if it is not destined to us. Other ID types but
2340        server are handled separately after processing them. */
2341     if (packet->dst_id && !(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
2342         packet->dst_id_type == SILC_ID_SERVER &&
2343         sock->type != SILC_SOCKET_TYPE_CLIENT &&
2344         memcmp(packet->dst_id, server->id_string, server->id_string_len)) {
2345
2346       /* Route the packet to fastest route for the destination ID */
2347       void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
2348                                 packet->dst_id_type);
2349       if (!id)
2350         goto out;
2351       silc_server_packet_route(server,
2352                                silc_server_route_get(server, id,
2353                                                      packet->dst_id_type),
2354                                packet);
2355       silc_free(id);
2356       goto out;
2357     }
2358   }
2359
2360   /* Parse the incoming packet type */
2361   silc_server_packet_parse_type(server, sock, packet);
2362
2363   /* Broadcast packet if it is marked as broadcast packet and it is
2364      originated from router and we are router. */
2365   if (server->server_type == SILC_ROUTER &&
2366       sock->type == SILC_SOCKET_TYPE_ROUTER &&
2367       packet->flags & SILC_PACKET_FLAG_BROADCAST) {
2368     /* Broadcast to our primary route */
2369     silc_server_packet_broadcast(server, SILC_PRIMARY_ROUTE(server), packet);
2370
2371     /* If we have backup routers then we need to feed all broadcast
2372        data to those servers. */
2373     silc_server_backup_broadcast(server, sock, packet);
2374   }
2375
2376  out:
2377   silc_packet_context_free(packet);
2378   silc_free(parse_ctx);
2379 }
2380
2381 /* Parser callback called by silc_packet_receive_process. This merely
2382    registers timeout that will handle the actual parsing when appropriate. */
2383
2384 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
2385                               void *context)
2386 {
2387   SilcServer server = (SilcServer)context;
2388   SilcSocketConnection sock = parser_context->sock;
2389   SilcIDListData idata = (SilcIDListData)sock->user_data;
2390   bool ret;
2391
2392   if (idata)
2393     idata->psn_receive = parser_context->packet->sequence + 1;
2394
2395   /* If protocol for this connection is key exchange or rekey then we'll
2396      process all packets synchronously, since there might be packets in
2397      queue that we are not able to decrypt without first processing the
2398      packets before them. */
2399   if ((parser_context->packet->type == SILC_PACKET_REKEY ||
2400        parser_context->packet->type == SILC_PACKET_REKEY_DONE) ||
2401       (sock->protocol && sock->protocol->protocol &&
2402        (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2403         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY))) {
2404     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2405                                   parser_context);
2406
2407     /* Reprocess data since we'll return FALSE here.  This is because
2408        the idata->receive_key might have become valid in the last packet
2409        and we want to call this processor with valid cipher. */
2410     if (idata)
2411       ret = silc_packet_receive_process(
2412                                   sock, server->server_type == SILC_ROUTER ?
2413                                   TRUE : FALSE, idata->receive_key,
2414                                   idata->hmac_receive, idata->psn_receive,
2415                                   silc_server_packet_parse, server);
2416     else
2417       ret = silc_packet_receive_process(
2418                                   sock, server->server_type == SILC_ROUTER ?
2419                                   TRUE : FALSE, NULL, NULL, 0,
2420                                   silc_server_packet_parse, server);
2421
2422     if (!ret) {
2423       /* On packet processing errors we may close our primary router
2424          connection but won't become primary router if we are the backup
2425          since this is local error condition. */
2426       if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2427         server->backup_noswitch = TRUE;
2428
2429       if (sock->user_data)
2430         silc_server_free_sock_user_data(server, sock, NULL);
2431       silc_server_close_connection(server, sock);
2432     }
2433
2434     return FALSE;
2435   }
2436
2437   switch (sock->type) {
2438   case SILC_SOCKET_TYPE_UNKNOWN:
2439   case SILC_SOCKET_TYPE_CLIENT:
2440     /* Parse the packet with timeout */
2441     silc_schedule_task_add(server->schedule, sock->sock,
2442                            silc_server_packet_parse_real,
2443                            (void *)parser_context, 0, 100000,
2444                            SILC_TASK_TIMEOUT,
2445                            SILC_TASK_PRI_NORMAL);
2446     break;
2447   case SILC_SOCKET_TYPE_SERVER:
2448   case SILC_SOCKET_TYPE_ROUTER:
2449     /* Packets from servers are parsed immediately */
2450     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2451                                   parser_context);
2452     break;
2453   default:
2454     return TRUE;
2455   }
2456
2457   return TRUE;
2458 }
2459
2460 /* Parses the packet type and calls what ever routines the packet type
2461    requires. This is done for all incoming packets. */
2462
2463 void silc_server_packet_parse_type(SilcServer server,
2464                                    SilcSocketConnection sock,
2465                                    SilcPacketContext *packet)
2466 {
2467   SilcPacketType type = packet->type;
2468   SilcIDListData idata = (SilcIDListData)sock->user_data;
2469
2470   SILC_LOG_DEBUG(("Received %s packet [flags %d]",
2471                   silc_get_packet_name(type), packet->flags));
2472
2473   /* Parse the packet type */
2474   switch (type) {
2475   case SILC_PACKET_DISCONNECT:
2476     {
2477       SilcStatus status;
2478       char *message = NULL;
2479
2480       if (packet->flags & SILC_PACKET_FLAG_LIST)
2481         break;
2482       if (packet->buffer->len < 1)
2483         break;
2484
2485       status = (SilcStatus)packet->buffer->data[0];
2486       if (packet->buffer->len > 1 &&
2487           silc_utf8_valid(packet->buffer->data + 1, packet->buffer->len - 1))
2488         message = silc_memdup(packet->buffer->data + 1,
2489                               packet->buffer->len - 1);
2490
2491       SILC_LOG_INFO(("Disconnected by %s (%s): %s (%d) %s",
2492                      sock->ip, sock->hostname,
2493                      silc_get_status_message(status), status,
2494                      message ? message : ""));
2495       silc_free(message);
2496
2497       /* Handle the disconnection from our end too */
2498       if (sock->user_data && SILC_IS_LOCAL(sock->user_data))
2499         silc_server_free_sock_user_data(server, sock, NULL);
2500       silc_server_close_connection(server, sock);
2501     }
2502     break;
2503
2504   case SILC_PACKET_SUCCESS:
2505     /*
2506      * Success received for something. For now we can have only
2507      * one protocol for connection executing at once hence this
2508      * success message is for whatever protocol is executing currently.
2509      */
2510     if (packet->flags & SILC_PACKET_FLAG_LIST)
2511       break;
2512     if (sock->protocol)
2513       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2514     break;
2515
2516   case SILC_PACKET_FAILURE:
2517     /*
2518      * Failure received for something. For now we can have only
2519      * one protocol for connection executing at once hence this
2520      * failure message is for whatever protocol is executing currently.
2521      */
2522     if (packet->flags & SILC_PACKET_FLAG_LIST)
2523       break;
2524     if (sock->protocol) {
2525       SilcServerFailureContext f;
2526       f = silc_calloc(1, sizeof(*f));
2527       f->sock = silc_socket_dup(sock);
2528
2529       /* We will wait 5 seconds to process this failure packet */
2530       silc_schedule_task_add(server->schedule, sock->sock,
2531                              silc_server_failure_callback, (void *)f, 5, 0,
2532                              SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2533     }
2534     break;
2535
2536   case SILC_PACKET_REJECT:
2537     if (packet->flags & SILC_PACKET_FLAG_LIST)
2538       break;
2539     return;
2540     break;
2541
2542   case SILC_PACKET_NOTIFY:
2543     /*
2544      * Received notify packet. Server can receive notify packets from
2545      * router. Server then relays the notify messages to clients if needed.
2546      */
2547     if (packet->flags & SILC_PACKET_FLAG_LIST)
2548       silc_server_notify_list(server, sock, packet);
2549     else
2550       silc_server_notify(server, sock, packet);
2551     break;
2552
2553     /*
2554      * Channel packets
2555      */
2556   case SILC_PACKET_CHANNEL_MESSAGE:
2557     /*
2558      * Received channel message. Channel messages are special packets
2559      * (although probably most common ones) thus they are handled
2560      * specially.
2561      */
2562     if (packet->flags & SILC_PACKET_FLAG_LIST)
2563       break;
2564     idata->last_receive = time(NULL);
2565     silc_server_channel_message(server, sock, packet);
2566     break;
2567
2568   case SILC_PACKET_CHANNEL_KEY:
2569     /*
2570      * Received key for channel. As channels are created by the router
2571      * the keys are as well. We will distribute the key to all of our
2572      * locally connected clients on the particular channel. Router
2573      * never receives this channel and thus is ignored.
2574      */
2575     if (packet->flags & SILC_PACKET_FLAG_LIST)
2576       break;
2577     silc_server_channel_key(server, sock, packet);
2578     break;
2579
2580     /*
2581      * Command packets
2582      */
2583   case SILC_PACKET_COMMAND:
2584     /*
2585      * Recived command. Processes the command request and allocates the
2586      * command context and calls the command.
2587      */
2588     if (packet->flags & SILC_PACKET_FLAG_LIST)
2589       break;
2590     silc_server_command_process(server, sock, packet);
2591     break;
2592
2593   case SILC_PACKET_COMMAND_REPLY:
2594     /*
2595      * Received command reply packet. Received command reply to command. It
2596      * may be reply to command sent by us or reply to command sent by client
2597      * that we've routed further.
2598      */
2599     if (packet->flags & SILC_PACKET_FLAG_LIST)
2600       break;
2601     silc_server_command_reply(server, sock, packet);
2602     break;
2603
2604     /*
2605      * Private Message packets
2606      */
2607   case SILC_PACKET_PRIVATE_MESSAGE:
2608     /*
2609      * Received private message packet. The packet is coming from either
2610      * client or server.
2611      */
2612     if (packet->flags & SILC_PACKET_FLAG_LIST)
2613       break;
2614     idata->last_receive = time(NULL);
2615     silc_server_private_message(server, sock, packet);
2616     break;
2617
2618   case SILC_PACKET_PRIVATE_MESSAGE_KEY:
2619     /*
2620      * Private message key packet.
2621      */
2622     if (packet->flags & SILC_PACKET_FLAG_LIST)
2623       break;
2624     silc_server_private_message_key(server, sock, packet);
2625     break;
2626
2627     /*
2628      * Key Exchange protocol packets
2629      */
2630   case SILC_PACKET_KEY_EXCHANGE:
2631     if (packet->flags & SILC_PACKET_FLAG_LIST)
2632       break;
2633
2634     if (sock->protocol && sock->protocol->protocol &&
2635         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
2636       SilcServerKEInternalContext *proto_ctx =
2637         (SilcServerKEInternalContext *)sock->protocol->context;
2638
2639       proto_ctx->packet = silc_packet_context_dup(packet);
2640
2641       /* Let the protocol handle the packet */
2642       silc_protocol_execute(sock->protocol, server->schedule, 0, 100000);
2643     } else {
2644       SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
2645                       "protocol active, packet dropped."));
2646     }
2647     break;
2648
2649   case SILC_PACKET_KEY_EXCHANGE_1:
2650     if (packet->flags & SILC_PACKET_FLAG_LIST)
2651       break;
2652
2653     if (sock->protocol && sock->protocol->protocol &&
2654         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2655          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2656
2657       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2658         SilcServerRekeyInternalContext *proto_ctx =
2659           (SilcServerRekeyInternalContext *)sock->protocol->context;
2660
2661         if (proto_ctx->packet)
2662           silc_packet_context_free(proto_ctx->packet);
2663
2664         proto_ctx->packet = silc_packet_context_dup(packet);
2665
2666         /* Let the protocol handle the packet */
2667         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2668       } else {
2669         SilcServerKEInternalContext *proto_ctx =
2670           (SilcServerKEInternalContext *)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         proto_ctx->dest_id_type = packet->src_id_type;
2677         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2678                                             packet->src_id_type);
2679         if (!proto_ctx->dest_id)
2680           break;
2681
2682         /* Let the protocol handle the packet */
2683         silc_protocol_execute(sock->protocol, server->schedule,
2684                               0, 100000);
2685       }
2686     } else {
2687       SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
2688                       "protocol active, packet dropped."));
2689     }
2690     break;
2691
2692   case SILC_PACKET_KEY_EXCHANGE_2:
2693     if (packet->flags & SILC_PACKET_FLAG_LIST)
2694       break;
2695
2696     if (sock->protocol && sock->protocol->protocol &&
2697         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2698          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2699
2700       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2701         SilcServerRekeyInternalContext *proto_ctx =
2702           (SilcServerRekeyInternalContext *)sock->protocol->context;
2703
2704         if (proto_ctx->packet)
2705           silc_packet_context_free(proto_ctx->packet);
2706
2707         proto_ctx->packet = silc_packet_context_dup(packet);
2708
2709         /* Let the protocol handle the packet */
2710         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2711       } else {
2712         SilcServerKEInternalContext *proto_ctx =
2713           (SilcServerKEInternalContext *)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         proto_ctx->dest_id_type = packet->src_id_type;
2720         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2721                                             packet->src_id_type);
2722         if (!proto_ctx->dest_id)
2723           break;
2724
2725         /* Let the protocol handle the packet */
2726         silc_protocol_execute(sock->protocol, server->schedule,
2727                               0, 100000);
2728       }
2729     } else {
2730       SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
2731                       "protocol active, packet dropped."));
2732     }
2733     break;
2734
2735   case SILC_PACKET_CONNECTION_AUTH_REQUEST:
2736     /*
2737      * Connection authentication request packet. When we receive this packet
2738      * we will send to the other end information about our mandatory
2739      * authentication method for the connection. This packet maybe received
2740      * at any time.
2741      */
2742     if (packet->flags & SILC_PACKET_FLAG_LIST)
2743       break;
2744     silc_server_connection_auth_request(server, sock, packet);
2745     break;
2746
2747     /*
2748      * Connection Authentication protocol packets
2749      */
2750   case SILC_PACKET_CONNECTION_AUTH:
2751     /* Start of the authentication protocol. We receive here the
2752        authentication data and will verify it. */
2753     if (packet->flags & SILC_PACKET_FLAG_LIST)
2754       break;
2755
2756     if (sock->protocol && sock->protocol->protocol->type
2757         == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
2758
2759       SilcServerConnAuthInternalContext *proto_ctx =
2760         (SilcServerConnAuthInternalContext *)sock->protocol->context;
2761
2762       proto_ctx->packet = silc_packet_context_dup(packet);
2763
2764       /* Let the protocol handle the packet */
2765       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2766     } else {
2767       SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
2768                       "protocol active, packet dropped."));
2769     }
2770     break;
2771
2772   case SILC_PACKET_NEW_ID:
2773     /*
2774      * Received New ID packet. This includes some new ID that has been
2775      * created. It may be for client, server or channel. This is the way
2776      * to distribute information about new registered entities in the
2777      * SILC network.
2778      */
2779     if (packet->flags & SILC_PACKET_FLAG_LIST)
2780       silc_server_new_id_list(server, sock, packet);
2781     else
2782       silc_server_new_id(server, sock, packet);
2783     break;
2784
2785   case SILC_PACKET_NEW_CLIENT:
2786     /*
2787      * Received new client packet. This includes client information that
2788      * we will use to create initial client ID. After creating new
2789      * ID we will send it to the client.
2790      */
2791     if (packet->flags & SILC_PACKET_FLAG_LIST)
2792       break;
2793     silc_server_new_client(server, sock, packet);
2794     break;
2795
2796   case SILC_PACKET_NEW_SERVER:
2797     /*
2798      * Received new server packet. This includes Server ID and some other
2799      * information that we may save. This is received after server has
2800      * connected to us.
2801      */
2802     if (packet->flags & SILC_PACKET_FLAG_LIST)
2803       break;
2804     silc_server_new_server(server, sock, packet);
2805     break;
2806
2807   case SILC_PACKET_NEW_CHANNEL:
2808     /*
2809      * Received new channel packet. Information about new channel in the
2810      * network are distributed using this packet.
2811      */
2812     if (packet->flags & SILC_PACKET_FLAG_LIST)
2813       silc_server_new_channel_list(server, sock, packet);
2814     else
2815       silc_server_new_channel(server, sock, packet);
2816     break;
2817
2818   case SILC_PACKET_HEARTBEAT:
2819     /*
2820      * Received heartbeat.
2821      */
2822     if (packet->flags & SILC_PACKET_FLAG_LIST)
2823       break;
2824     break;
2825
2826   case SILC_PACKET_KEY_AGREEMENT:
2827     /*
2828      * Received heartbeat.
2829      */
2830     if (packet->flags & SILC_PACKET_FLAG_LIST)
2831       break;
2832     silc_server_key_agreement(server, sock, packet);
2833     break;
2834
2835   case SILC_PACKET_REKEY:
2836     /*
2837      * Received re-key packet. The sender wants to regenerate the session
2838      * keys.
2839      */
2840     if (packet->flags & SILC_PACKET_FLAG_LIST)
2841       break;
2842     silc_server_rekey(server, sock, packet);
2843     break;
2844
2845   case SILC_PACKET_REKEY_DONE:
2846     /*
2847      * The re-key is done.
2848      */
2849     if (packet->flags & SILC_PACKET_FLAG_LIST)
2850       break;
2851
2852     if (sock->protocol && sock->protocol->protocol &&
2853         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2854
2855       SilcServerRekeyInternalContext *proto_ctx =
2856         (SilcServerRekeyInternalContext *)sock->protocol->context;
2857
2858       if (proto_ctx->packet)
2859         silc_packet_context_free(proto_ctx->packet);
2860
2861       proto_ctx->packet = silc_packet_context_dup(packet);
2862
2863       /* Let the protocol handle the packet */
2864       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2865     } else {
2866       SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2867                       "protocol active, packet dropped."));
2868     }
2869     break;
2870
2871   case SILC_PACKET_FTP:
2872     /* FTP packet */
2873     if (packet->flags & SILC_PACKET_FLAG_LIST)
2874       break;
2875     silc_server_ftp(server, sock, packet);
2876     break;
2877
2878   case SILC_PACKET_RESUME_CLIENT:
2879     /* Resume client */
2880     if (packet->flags & SILC_PACKET_FLAG_LIST)
2881       break;
2882     silc_server_resume_client(server, sock, packet);
2883     break;
2884
2885   case SILC_PACKET_RESUME_ROUTER:
2886     /* Resume router packet received. This packet is received for backup
2887        router resuming protocol. */
2888     if (packet->flags & SILC_PACKET_FLAG_LIST)
2889       break;
2890     silc_server_backup_resume_router(server, sock, packet);
2891     break;
2892
2893   default:
2894     SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2895     break;
2896   }
2897 }
2898
2899 /* Creates connection to a remote router. */
2900
2901 void silc_server_create_connection(SilcServer server,
2902                                    const char *remote_host, SilcUInt32 port)
2903 {
2904   SilcServerConnection sconn;
2905
2906   /* Allocate connection object for hold connection specific stuff. */
2907   sconn = silc_calloc(1, sizeof(*sconn));
2908   sconn->remote_host = strdup(remote_host);
2909   sconn->remote_port = port;
2910   sconn->no_reconnect = TRUE;
2911
2912   silc_schedule_task_add(server->schedule, 0,
2913                          silc_server_connect_router,
2914                          (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2915                          SILC_TASK_PRI_NORMAL);
2916 }
2917
2918 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2919 {
2920   silc_socket_free(context);
2921 }
2922
2923 /* Closes connection to socket connection */
2924
2925 void silc_server_close_connection(SilcServer server,
2926                                   SilcSocketConnection sock)
2927 {
2928   char tmp[128];
2929
2930   if (!server->sockets[sock->sock] && SILC_IS_DISCONNECTED(sock)) {
2931     silc_schedule_task_add(server->schedule, 0,
2932                            silc_server_close_connection_final,
2933                            (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2934                            SILC_TASK_PRI_NORMAL);
2935     return;
2936   }
2937
2938   memset(tmp, 0, sizeof(tmp));
2939   silc_socket_get_error(sock, tmp, sizeof(tmp));
2940   SILC_LOG_INFO(("Closing connection %s:%d [%s] %s", sock->hostname,
2941                   sock->port,
2942                   (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2943                    sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2944                    sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2945                    "Router"), tmp[0] ? tmp : ""));
2946
2947   /* We won't listen for this connection anymore */
2948   silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2949
2950   /* Unregister all tasks */
2951   silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2952
2953   /* Close the actual connection */
2954   silc_net_close_connection(sock->sock);
2955   server->sockets[sock->sock] = NULL;
2956
2957   /* If sock->user_data is NULL then we'll check for active protocols
2958      here since the silc_server_free_sock_user_data has not been called
2959      for this connection. */
2960   if (!sock->user_data) {
2961     /* If any protocol is active cancel its execution. It will call
2962        the final callback which will finalize the disconnection. */
2963     if (sock->protocol) {
2964       SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
2965       silc_protocol_cancel(sock->protocol, server->schedule);
2966       sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2967       silc_protocol_execute_final(sock->protocol, server->schedule);
2968       sock->protocol = NULL;
2969       return;
2970     }
2971   }
2972
2973   silc_schedule_task_add(server->schedule, 0,
2974                          silc_server_close_connection_final,
2975                          (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2976                          SILC_TASK_PRI_NORMAL);
2977 }
2978
2979 /* Sends disconnect message to remote connection and disconnects the
2980    connection. */
2981
2982 void silc_server_disconnect_remote(SilcServer server,
2983                                    SilcSocketConnection sock,
2984                                    SilcStatus status, ...)
2985 {
2986   va_list ap;
2987   unsigned char buf[512];
2988   SilcBuffer buffer;
2989   char *cp;
2990   int len;
2991
2992   if (!sock || SILC_IS_DISCONNECTED(sock))
2993     return;
2994
2995   memset(buf, 0, sizeof(buf));
2996   va_start(ap, status);
2997   cp = va_arg(ap, char *);
2998   if (cp) {
2999     vsnprintf(buf, sizeof(buf) - 1, cp, ap);
3000     cp = buf;
3001   }
3002   va_end(ap);
3003
3004   SILC_LOG_DEBUG(("Disconnecting remote host"));
3005
3006   /* Notify remote end that the conversation is over. The notify message
3007      is tried to be sent immediately. */
3008
3009   len = 1;
3010   if (cp)
3011     len += silc_utf8_encoded_len(buf, strlen(buf), SILC_STRING_ASCII);
3012
3013   buffer = silc_buffer_alloc_size(len);
3014   if (!buffer)
3015     goto out;
3016
3017   buffer->data[0] = status;
3018   if (cp)
3019     silc_utf8_encode(buf, strlen(buf), SILC_STRING_ASCII, buffer->data + 1,
3020                      buffer->len - 1);
3021   silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
3022                           buffer->data, buffer->len, TRUE);
3023   silc_buffer_free(buffer);
3024
3025  out:
3026   silc_server_packet_queue_purge(server, sock);
3027
3028   /* Mark the connection to be disconnected */
3029   SILC_SET_DISCONNECTED(sock);
3030   silc_server_close_connection(server, sock);
3031 }
3032
3033 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
3034 {
3035   SilcServer server = app_context;
3036   SilcClientEntry client = context;
3037
3038   assert(!silc_hash_table_count(client->channels));
3039
3040   silc_idlist_del_data(client);
3041   silc_idcache_purge_by_context(server->local_list->clients, client);
3042 }
3043
3044 /* Frees client data and notifies about client's signoff. */
3045
3046 void silc_server_free_client_data(SilcServer server,
3047                                   SilcSocketConnection sock,
3048                                   SilcClientEntry client,
3049                                   int notify,
3050                                   const char *signoff)
3051 {
3052   SILC_LOG_DEBUG(("Freeing client data"));
3053
3054   /* If there is pending outgoing data for the client then purge it
3055      to the network before removing the client entry. */
3056   silc_server_packet_queue_purge(server, sock);
3057
3058   if (client->id) {
3059     /* Check if anyone is watching this nickname */
3060     if (server->server_type == SILC_ROUTER)
3061       silc_server_check_watcher_list(server, client, NULL,
3062                                      SILC_NOTIFY_TYPE_SIGNOFF);
3063
3064     /* Send SIGNOFF notify to routers. */
3065     if (notify)
3066       silc_server_send_notify_signoff(server, SILC_PRIMARY_ROUTE(server),
3067                                       SILC_BROADCAST(server), client->id,
3068                                       signoff);
3069   }
3070
3071   /* Remove client from all channels */
3072   if (notify)
3073     silc_server_remove_from_channels(server, NULL, client,
3074                                      TRUE, (char *)signoff, TRUE);
3075   else
3076     silc_server_remove_from_channels(server, NULL, client,
3077                                      FALSE, NULL, FALSE);
3078
3079   /* Remove this client from watcher list if it is */
3080   silc_server_del_from_watcher_list(server, client);
3081
3082   /* Update statistics */
3083   server->stat.my_clients--;
3084   server->stat.clients--;
3085   if (server->stat.cell_clients)
3086     server->stat.cell_clients--;
3087   SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
3088   SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
3089   silc_schedule_task_del_by_context(server->schedule, client);
3090
3091   /* We will not delete the client entry right away. We will take it
3092      into history (for WHOWAS command) for 5 minutes, unless we're
3093      shutting down server. */
3094   if (!server->server_shutdown) {
3095     silc_schedule_task_add(server->schedule, 0,
3096                            silc_server_free_client_data_timeout,
3097                            client, 300, 0,
3098                            SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
3099     client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
3100     client->data.status &= ~SILC_IDLIST_STATUS_LOCAL;
3101     client->mode = 0;
3102     client->router = NULL;
3103     client->connection = NULL;
3104   } else {
3105     /* Delete directly since we're shutting down server */
3106     silc_idlist_del_data(client);
3107     silc_idlist_del_client(server->local_list, client);
3108   }
3109 }
3110
3111 /* Frees user_data pointer from socket connection object. This also sends
3112    appropriate notify packets to the network to inform about leaving
3113    entities. */
3114
3115 void silc_server_free_sock_user_data(SilcServer server,
3116                                      SilcSocketConnection sock,
3117                                      const char *signoff_message)
3118 {
3119   switch (sock->type) {
3120   case SILC_SOCKET_TYPE_CLIENT:
3121     {
3122       SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
3123       silc_server_free_client_data(server, sock, user_data, TRUE,
3124                                    signoff_message);
3125       break;
3126     }
3127   case SILC_SOCKET_TYPE_SERVER:
3128   case SILC_SOCKET_TYPE_ROUTER:
3129     {
3130       SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
3131       SilcServerEntry backup_router = NULL;
3132
3133       SILC_LOG_DEBUG(("Freeing server data"));
3134
3135       if (user_data->id)
3136         backup_router = silc_server_backup_get(server, user_data->id);
3137
3138       if (!server->backup_router && server->server_type == SILC_ROUTER &&
3139           backup_router == server->id_entry &&
3140           sock->type != SILC_SOCKET_TYPE_ROUTER)
3141         backup_router = NULL;
3142
3143       if (server->server_shutdown || server->backup_noswitch)
3144         backup_router = NULL;
3145
3146       /* If this was our primary router connection then we're lost to
3147          the outside world. */
3148       if (server->router == user_data) {
3149         /* Check whether we have a backup router connection */
3150         if (!backup_router || backup_router == user_data) {
3151           silc_schedule_task_add(server->schedule, 0,
3152                                  silc_server_connect_to_router,
3153                                  server, 1, 0,
3154                                  SILC_TASK_TIMEOUT,
3155                                  SILC_TASK_PRI_NORMAL);
3156
3157           server->id_entry->router = NULL;
3158           server->router = NULL;
3159           server->standalone = TRUE;
3160           backup_router = NULL;
3161         } else {
3162           if (server->id_entry != backup_router) {
3163             SILC_LOG_INFO(("New primary router is backup router %s",
3164                            backup_router->server_name));
3165             server->id_entry->router = backup_router;
3166             server->router = backup_router;
3167             server->router_connect = time(0);
3168             server->backup_primary = TRUE;
3169           } else {
3170             SILC_LOG_INFO(("We are now new primary router in this cell"));
3171             server->id_entry->router = NULL;
3172             server->router = NULL;
3173             server->standalone = TRUE;
3174
3175             /* We stop here to take a breath */
3176             sleep(2);
3177           }
3178
3179           if (server->server_type == SILC_BACKUP_ROUTER) {
3180             server->server_type = SILC_ROUTER;
3181
3182             /* We'll need to constantly try to reconnect to the primary
3183                router so that we'll see when it comes back online. */
3184             silc_server_backup_reconnect(server, sock->ip, sock->port,
3185                                          silc_server_backup_connected,
3186                                          NULL);
3187           }
3188
3189           /* Mark this connection as replaced */
3190           silc_server_backup_replaced_add(server, user_data->id,
3191                                           backup_router);
3192         }
3193       } else if (backup_router) {
3194         SILC_LOG_INFO(("Enabling the use of backup router %s",
3195                        backup_router->server_name));
3196         SILC_LOG_DEBUG(("Enabling the use of backup router %s",
3197                         backup_router->server_name));
3198
3199         /* Mark this connection as replaced */
3200         silc_server_backup_replaced_add(server, user_data->id,
3201                                         backup_router);
3202       } else if (server->server_type == SILC_SERVER &&
3203                  sock->type == SILC_SOCKET_TYPE_ROUTER) {
3204         /* Reconnect to the router (backup) */
3205         silc_schedule_task_add(server->schedule, 0,
3206                                silc_server_connect_to_router,
3207                                server, 1, 0,
3208                                SILC_TASK_TIMEOUT,
3209                                SILC_TASK_PRI_NORMAL);
3210       }
3211
3212       if (!backup_router) {
3213         /* Remove all servers that are originated from this server, and
3214            remove the clients of those servers too. */
3215         silc_server_remove_servers_by_server(server, user_data, TRUE);
3216
3217         /* Remove the clients that this server owns as they will become
3218            invalid now too.  For backup router the server is actually
3219            coming from the primary router, so mark that as the owner
3220            of this entry. */
3221         if (server->server_type == SILC_BACKUP_ROUTER &&
3222             sock->type == SILC_SOCKET_TYPE_SERVER)
3223           silc_server_remove_clients_by_server(server, server->router,
3224                                                user_data, TRUE);
3225         else
3226           silc_server_remove_clients_by_server(server, user_data,
3227                                                user_data, TRUE);
3228
3229         /* Remove channels owned by this server */
3230         if (server->server_type == SILC_SERVER)
3231           silc_server_remove_channels_by_server(server, user_data);
3232       } else {
3233         /* Enable local server connections that may be disabled */
3234         silc_server_local_servers_toggle_enabled(server, TRUE);
3235
3236         /* Update the client entries of this server to the new backup
3237            router.  If we are the backup router we also resolve the real
3238            servers for the clients.  After updating is over this also
3239            removes the clients that this server explicitly owns. */
3240         silc_server_update_clients_by_server(server, user_data,
3241                                              backup_router, TRUE);
3242
3243         /* If we are router and just lost our primary router (now standlaone)
3244            we remove everything that was behind it, since we don't know
3245            any better. */
3246         if (server->server_type == SILC_ROUTER && server->standalone)
3247           /* Remove all servers that are originated from this server, and
3248              remove the clients of those servers too. */
3249           silc_server_remove_servers_by_server(server, user_data, TRUE);
3250
3251         /* Finally remove the clients that are explicitly owned by this
3252            server.  They go down with the server. */
3253         silc_server_remove_clients_by_server(server, user_data,
3254                                              user_data, TRUE);
3255
3256         /* Update our server cache to use the new backup router too. */
3257         silc_server_update_servers_by_server(server, user_data, backup_router);
3258         if (server->server_type == SILC_SERVER)
3259           silc_server_update_channels_by_server(server, user_data,
3260                                                 backup_router);
3261
3262         /* Send notify about primary router going down to local operators */
3263         if (server->backup_router)
3264           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3265                                  SILC_NOTIFY_TYPE_NONE,
3266                                  ("%s switched to backup router %s "
3267                                   "(we are primary router now)",
3268                                   server->server_name, server->server_name));
3269         else if (server->router)
3270           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3271                                  SILC_NOTIFY_TYPE_NONE,
3272                                  ("%s switched to backup router %s",
3273                                   server->server_name,
3274                                   server->router->server_name));
3275       }
3276       server->backup_noswitch = FALSE;
3277
3278       /* Free the server entry */
3279       silc_server_backup_del(server, user_data);
3280       silc_server_backup_replaced_del(server, user_data);
3281       silc_idlist_del_data(user_data);
3282       if (!silc_idlist_del_server(server->local_list, user_data))
3283         silc_idlist_del_server(server->global_list, user_data);
3284       if (sock->type == SILC_SOCKET_TYPE_SERVER) {
3285         server->stat.my_servers--;
3286       } else {
3287         server->stat.my_routers--;
3288         server->stat.routers--;
3289       }
3290       server->stat.servers--;
3291       if (server->server_type == SILC_ROUTER)
3292         server->stat.cell_servers--;
3293
3294       if (backup_router && backup_router != server->id_entry) {
3295         /* Announce all of our stuff that was created about 5 minutes ago.
3296            The backup router knows all the other stuff already. */
3297         if (server->server_type == SILC_ROUTER)
3298           silc_server_announce_servers(server, FALSE, time(0) - 300,
3299                                        backup_router->connection);
3300
3301         /* Announce our clients and channels to the router */
3302         silc_server_announce_clients(server, time(0) - 300,
3303                                      backup_router->connection);
3304         silc_server_announce_channels(server, time(0) - 300,
3305                                       backup_router->connection);
3306       }
3307       break;
3308     }
3309   default:
3310     {
3311       SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
3312
3313       SILC_LOG_DEBUG(("Freeing unknown connection data"));
3314
3315       silc_idlist_del_data(user_data);
3316       silc_free(user_data);
3317       break;
3318     }
3319   }
3320
3321   /* If any protocol is active cancel its execution */
3322   if (sock->protocol) {
3323     SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
3324     silc_protocol_cancel(sock->protocol, server->schedule);
3325     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3326     silc_protocol_execute_final(sock->protocol, server->schedule);
3327     sock->protocol = NULL;
3328   }
3329
3330   sock->user_data = NULL;
3331 }
3332
3333 /* Removes client from all channels it has joined. This is used when client
3334    connection is disconnected. If the client on a channel is last, the
3335    channel is removed as well. This sends the SIGNOFF notify types. */
3336
3337 void silc_server_remove_from_channels(SilcServer server,
3338                                       SilcSocketConnection sock,
3339                                       SilcClientEntry client,
3340                                       bool notify,
3341                                       const char *signoff_message,
3342                                       bool keygen)
3343 {
3344   SilcChannelEntry channel;
3345   SilcChannelClientEntry chl;
3346   SilcHashTableList htl;
3347   SilcBuffer clidp = NULL;
3348
3349   if (!client)
3350     return;
3351
3352   SILC_LOG_DEBUG(("Removing client from joined channels"));
3353
3354   if (notify && !client->id)
3355     notify = FALSE;
3356
3357   if (notify) {
3358     clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3359     if (!clidp)
3360       notify = FALSE;
3361   }
3362
3363   /* Remove the client from all channels. The client is removed from
3364      the channels' user list. */
3365   silc_hash_table_list(client->channels, &htl);
3366   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3367     channel = chl->channel;
3368
3369     /* Remove channel if this is last client leaving the channel, unless
3370        the channel is permanent. */
3371     if (server->server_type != SILC_SERVER &&
3372         silc_hash_table_count(channel->user_list) < 2) {
3373       silc_server_channel_delete(server, channel);
3374       continue;
3375     }
3376
3377     silc_hash_table_del(client->channels, channel);
3378     silc_hash_table_del(channel->user_list, client);
3379     channel->user_count--;
3380
3381     /* If there is no global users on the channel anymore mark the channel
3382        as local channel. Do not check if the removed client is local client. */
3383     if (server->server_type == SILC_SERVER && channel->global_users &&
3384         chl->client->router && !silc_server_channel_has_global(channel))
3385       channel->global_users = FALSE;
3386
3387     memset(chl, 'A', sizeof(*chl));
3388     silc_free(chl);
3389
3390     /* Update statistics */
3391     if (SILC_IS_LOCAL(client))
3392       server->stat.my_chanclients--;
3393     if (server->server_type == SILC_ROUTER) {
3394       server->stat.cell_chanclients--;
3395       server->stat.chanclients--;
3396     }
3397
3398     /* If there is not at least one local user on the channel then we don't
3399        need the channel entry anymore, we can remove it safely, unless the
3400        channel is permanent channel */
3401     if (server->server_type == SILC_SERVER &&
3402         !silc_server_channel_has_local(channel)) {
3403       /* Notify about leaving client if this channel has global users. */
3404       if (notify && channel->global_users)
3405         silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3406                                            SILC_NOTIFY_TYPE_SIGNOFF,
3407                                            signoff_message ? 2 : 1,
3408                                            clidp->data, clidp->len,
3409                                            signoff_message, signoff_message ?
3410                                            strlen(signoff_message) : 0);
3411
3412       silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3413       silc_server_channel_delete(server, channel);
3414       continue;
3415     }
3416
3417     /* Send notify to channel about client leaving SILC and channel too */
3418     if (notify)
3419       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3420                                          SILC_NOTIFY_TYPE_SIGNOFF,
3421                                          signoff_message ? 2 : 1,
3422                                          clidp->data, clidp->len,
3423                                          signoff_message, signoff_message ?
3424                                          strlen(signoff_message) : 0);
3425
3426     /* Don't create keys if we are shutting down */
3427     if (server->server_shutdown)
3428       continue;
3429
3430     /* Re-generate channel key if needed */
3431     if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
3432       if (!silc_server_create_channel_key(server, channel, 0))
3433         continue;
3434
3435       /* Send the channel key to the channel. The key of course is not sent
3436          to the client who was removed from the channel. */
3437       silc_server_send_channel_key(server, client->connection, channel,
3438                                    server->server_type == SILC_ROUTER ?
3439                                    FALSE : !server->standalone);
3440     }
3441   }
3442
3443   silc_hash_table_list_reset(&htl);
3444   if (clidp)
3445     silc_buffer_free(clidp);
3446 }
3447
3448 /* Removes client from one channel. This is used for example when client
3449    calls LEAVE command to remove itself from the channel. Returns TRUE
3450    if channel still exists and FALSE if the channel is removed when
3451    last client leaves the channel. If `notify' is FALSE notify messages
3452    are not sent. */
3453
3454 bool silc_server_remove_from_one_channel(SilcServer server,
3455                                          SilcSocketConnection sock,
3456                                          SilcChannelEntry channel,
3457                                          SilcClientEntry client,
3458                                          bool notify)
3459 {
3460   SilcChannelClientEntry chl;
3461   SilcBuffer clidp;
3462
3463   SILC_LOG_DEBUG(("Removing %s from channel %s",
3464                   silc_id_render(client->id, SILC_ID_CLIENT),
3465                   channel->channel_name));
3466
3467   /* Get the entry to the channel, if this client is not on the channel
3468      then return Ok. */
3469   if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
3470     return TRUE;
3471
3472   /* Remove channel if this is last client leaving the channel, unless
3473      the channel is permanent. */
3474   if (server->server_type != SILC_SERVER &&
3475       silc_hash_table_count(channel->user_list) < 2) {
3476     silc_server_channel_delete(server, channel);
3477     return FALSE;
3478   }
3479
3480   silc_hash_table_del(client->channels, channel);
3481   silc_hash_table_del(channel->user_list, client);
3482   channel->user_count--;
3483
3484   /* If there is no global users on the channel anymore mark the channel
3485      as local channel. Do not check if the client is local client. */
3486   if (server->server_type == SILC_SERVER && channel->global_users &&
3487       chl->client->router && !silc_server_channel_has_global(channel))
3488     channel->global_users = FALSE;
3489
3490   memset(chl, 'O', sizeof(*chl));
3491   silc_free(chl);
3492
3493   /* Update statistics */
3494   if (SILC_IS_LOCAL(client))
3495     server->stat.my_chanclients--;
3496   if (server->server_type == SILC_ROUTER) {
3497     server->stat.cell_chanclients--;
3498     server->stat.chanclients--;
3499   }
3500
3501   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3502   if (!clidp)
3503     notify = FALSE;
3504
3505   /* If there is not at least one local user on the channel then we don't
3506      need the channel entry anymore, we can remove it safely, unless the
3507      channel is permanent channel */
3508   if (server->server_type == SILC_SERVER &&
3509       !silc_server_channel_has_local(channel)) {
3510     /* Notify about leaving client if this channel has global users. */
3511     if (notify && channel->global_users)
3512       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3513                                          SILC_NOTIFY_TYPE_LEAVE, 1,
3514                                          clidp->data, clidp->len);
3515
3516     silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3517     silc_server_channel_delete(server, channel);
3518     silc_buffer_free(clidp);
3519     return FALSE;
3520   }
3521
3522   /* Send notify to channel about client leaving the channel */
3523   if (notify)
3524     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3525                                        SILC_NOTIFY_TYPE_LEAVE, 1,
3526                                        clidp->data, clidp->len);
3527
3528   silc_buffer_free(clidp);
3529   return TRUE;
3530 }
3531
3532 /* Timeout callback. This is called if connection is idle or for some
3533    other reason is not responding within some period of time. This
3534    disconnects the remote end. */
3535
3536 SILC_TASK_CALLBACK(silc_server_timeout_remote)
3537 {
3538   SilcServer server = (SilcServer)context;
3539   SilcSocketConnection sock = server->sockets[fd];
3540   SilcProtocolType protocol = 0;
3541
3542   SILC_LOG_DEBUG(("Start"));
3543
3544   if (!sock)
3545     return;
3546
3547   SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
3548                   sock->hostname, sock->ip));
3549
3550   /* If we have protocol active we must assure that we call the protocol's
3551      final callback so that all the memory is freed. */
3552   if (sock->protocol) {
3553     protocol = sock->protocol->protocol->type;
3554     silc_protocol_cancel(sock->protocol, server->schedule);
3555     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3556     silc_protocol_execute_final(sock->protocol, server->schedule);
3557     sock->protocol = NULL;
3558     return;
3559   }
3560
3561   silc_server_disconnect_remote(server, sock,
3562                                 protocol ==
3563                                 SILC_PROTOCOL_SERVER_CONNECTION_AUTH ?
3564                                 SILC_STATUS_ERR_AUTH_FAILED :
3565                                 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
3566                                 "Connection timeout");
3567
3568   if (sock->user_data)
3569     silc_server_free_sock_user_data(server, sock, NULL);
3570 }
3571
3572 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
3573    function may be used only by router. In real SILC network all channels
3574    are created by routers thus this function is never used by normal
3575    server. */
3576
3577 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
3578                                                 SilcServerID *router_id,
3579                                                 char *cipher,
3580                                                 char *hmac,
3581                                                 char *channel_name,
3582                                                 int broadcast)
3583 {
3584   SilcChannelID *channel_id;
3585   SilcChannelEntry entry;
3586   SilcCipher key;
3587   SilcHmac newhmac;
3588
3589   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3590
3591   if (!cipher)
3592     cipher = SILC_DEFAULT_CIPHER;
3593   if (!hmac)
3594     hmac = SILC_DEFAULT_HMAC;
3595
3596   /* Allocate cipher */
3597   if (!silc_cipher_alloc(cipher, &key))
3598     return NULL;
3599
3600   /* Allocate hmac */
3601   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3602     silc_cipher_free(key);
3603     return NULL;
3604   }
3605
3606   channel_name = strdup(channel_name);
3607
3608   /* Create the channel ID */
3609   if (!silc_id_create_channel_id(server, router_id, server->rng,
3610                                  &channel_id)) {
3611     silc_free(channel_name);
3612     silc_cipher_free(key);
3613     silc_hmac_free(newhmac);
3614     return NULL;
3615   }
3616
3617   /* Create the channel */
3618   entry = silc_idlist_add_channel(server->local_list, channel_name,
3619                                   SILC_CHANNEL_MODE_NONE, channel_id,
3620                                   NULL, key, newhmac, 0);
3621   if (!entry) {
3622     silc_free(channel_name);
3623     silc_cipher_free(key);
3624     silc_hmac_free(newhmac);
3625     silc_free(channel_id);
3626     return NULL;
3627   }
3628
3629   entry->cipher = strdup(cipher);
3630   entry->hmac_name = strdup(hmac);
3631
3632   /* Now create the actual key material */
3633   if (!silc_server_create_channel_key(server, entry,
3634                                       silc_cipher_get_key_len(key) / 8)) {
3635     silc_idlist_del_channel(server->local_list, entry);
3636     return NULL;
3637   }
3638
3639   /* Notify other routers about the new channel. We send the packet
3640      to our primary route. */
3641   if (broadcast)
3642     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3643                                  channel_name, entry->id,
3644                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3645                                  entry->mode);
3646
3647   /* Distribute to backup routers */
3648   if (broadcast && server->server_type == SILC_ROUTER) {
3649     SilcBuffer packet;
3650     unsigned char *cid;
3651     SilcUInt32 name_len = strlen(channel_name);
3652     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3653     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3654
3655     packet = silc_channel_payload_encode(channel_name, name_len,
3656                                          cid, channel_id_len, entry->mode);
3657     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3658                             packet->data, packet->len, FALSE, TRUE);
3659     silc_free(cid);
3660     silc_buffer_free(packet);
3661   }
3662
3663   server->stat.my_channels++;
3664   if (server->server_type == SILC_ROUTER) {
3665     server->stat.channels++;
3666     server->stat.cell_channels++;
3667     entry->users_resolved = TRUE;
3668   }
3669
3670   return entry;
3671 }
3672
3673 /* Same as above but creates the channel with Channel ID `channel_id. */
3674
3675 SilcChannelEntry
3676 silc_server_create_new_channel_with_id(SilcServer server,
3677                                        char *cipher,
3678                                        char *hmac,
3679                                        char *channel_name,
3680                                        SilcChannelID *channel_id,
3681                                        int broadcast)
3682 {
3683   SilcChannelEntry entry;
3684   SilcCipher key;
3685   SilcHmac newhmac;
3686
3687   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3688
3689   if (!cipher)
3690     cipher = SILC_DEFAULT_CIPHER;
3691   if (!hmac)
3692     hmac = SILC_DEFAULT_HMAC;
3693
3694   /* Allocate cipher */
3695   if (!silc_cipher_alloc(cipher, &key))
3696     return NULL;
3697
3698   /* Allocate hmac */
3699   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3700     silc_cipher_free(key);
3701     return NULL;
3702   }
3703
3704   channel_name = strdup(channel_name);
3705
3706   /* Create the channel */
3707   entry = silc_idlist_add_channel(server->local_list, channel_name,
3708                                   SILC_CHANNEL_MODE_NONE, channel_id,
3709                                   NULL, key, newhmac, 0);
3710   if (!entry) {
3711     silc_cipher_free(key);
3712     silc_hmac_free(newhmac);
3713     silc_free(channel_name);
3714     return NULL;
3715   }
3716
3717   /* Now create the actual key material */
3718   if (!silc_server_create_channel_key(server, entry,
3719                                       silc_cipher_get_key_len(key) / 8)) {
3720     silc_idlist_del_channel(server->local_list, entry);
3721     return NULL;
3722   }
3723
3724   /* Notify other routers about the new channel. We send the packet
3725      to our primary route. */
3726   if (broadcast)
3727     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3728                                  channel_name, entry->id,
3729                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3730                                  entry->mode);
3731
3732   /* Distribute to backup routers */
3733   if (broadcast && server->server_type == SILC_ROUTER) {
3734     SilcBuffer packet;
3735     unsigned char *cid;
3736     SilcUInt32 name_len = strlen(channel_name);
3737     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3738     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3739
3740     packet = silc_channel_payload_encode(channel_name, name_len,
3741                                          cid, channel_id_len, entry->mode);
3742     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3743                             packet->data, packet->len, FALSE, TRUE);
3744     silc_free(cid);
3745     silc_buffer_free(packet);
3746   }
3747
3748   server->stat.my_channels++;
3749   if (server->server_type == SILC_ROUTER) {
3750     server->stat.channels++;
3751     server->stat.cell_channels++;
3752     entry->users_resolved = TRUE;
3753   }
3754
3755   return entry;
3756 }
3757
3758 /* Channel's key re-key timeout callback. */
3759
3760 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3761 {
3762   SilcServer server = app_context;
3763   SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3764
3765   rekey->task = NULL;
3766
3767   /* Return now if we are shutting down */
3768   if (server->server_shutdown)
3769     return;
3770
3771   if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3772     return;
3773
3774   silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3775 }
3776
3777 /* Generates new channel key. This is used to create the initial channel key
3778    but also to re-generate new key for channel. If `key_len' is provided
3779    it is the bytes of the key length. */
3780
3781 bool silc_server_create_channel_key(SilcServer server,
3782                                     SilcChannelEntry channel,
3783                                     SilcUInt32 key_len)
3784 {
3785   int i;
3786   unsigned char channel_key[32], hash[32];
3787   SilcUInt32 len;
3788
3789   if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3790     SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3791     return TRUE;
3792   }
3793
3794   SILC_LOG_DEBUG(("Generating channel %s key", channel->channel_name));
3795
3796   if (!channel->channel_key)
3797     if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3798       channel->channel_key = NULL;
3799       return FALSE;
3800     }
3801
3802   if (key_len)
3803     len = key_len;
3804   else if (channel->key_len)
3805     len = channel->key_len / 8;
3806   else
3807     len = silc_cipher_get_key_len(channel->channel_key) / 8;
3808
3809   /* Create channel key */
3810   for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3811
3812   /* Set the key */
3813   silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3814
3815   /* Remove old key if exists */
3816   if (channel->key) {
3817     memset(channel->key, 0, channel->key_len / 8);
3818     silc_free(channel->key);
3819   }
3820
3821   /* Save the key */
3822   channel->key_len = len * 8;
3823   channel->key = silc_memdup(channel_key, len);
3824   memset(channel_key, 0, sizeof(channel_key));
3825
3826   /* Generate HMAC key from the channel key data and set it */
3827   if (!channel->hmac)
3828     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3829   silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3830   silc_hmac_set_key(channel->hmac, hash,
3831                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3832   memset(hash, 0, sizeof(hash));
3833
3834   if (server->server_type == SILC_ROUTER) {
3835     if (!channel->rekey)
3836       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3837     channel->rekey->channel = channel;
3838     channel->rekey->key_len = key_len;
3839     if (channel->rekey->task)
3840       silc_schedule_task_del(server->schedule, channel->rekey->task);
3841
3842     channel->rekey->task =
3843       silc_schedule_task_add(server->schedule, 0,
3844                              silc_server_channel_key_rekey,
3845                              (void *)channel->rekey,
3846                              server->config->channel_rekey_secs, 0,
3847                              SILC_TASK_TIMEOUT,
3848                              SILC_TASK_PRI_NORMAL);
3849   }
3850
3851   return TRUE;
3852 }
3853
3854 /* Saves the channel key found in the encoded `key_payload' buffer. This
3855    function is used when we receive Channel Key Payload and also when we're
3856    processing JOIN command reply. Returns entry to the channel. */
3857
3858 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3859                                               SilcBuffer key_payload,
3860                                               SilcChannelEntry channel)
3861 {
3862   SilcChannelKeyPayload payload = NULL;
3863   SilcChannelID *id = NULL;
3864   unsigned char *tmp, hash[32];
3865   SilcUInt32 tmp_len;
3866   char *cipher;
3867
3868   /* Decode channel key payload */
3869   payload = silc_channel_key_payload_parse(key_payload->data,
3870                                            key_payload->len);
3871   if (!payload) {
3872     SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3873     channel = NULL;
3874     goto out;
3875   }
3876
3877   /* Get the channel entry */
3878   if (!channel) {
3879
3880     /* Get channel ID */
3881     tmp = silc_channel_key_get_id(payload, &tmp_len);
3882     id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3883     if (!id) {
3884       channel = NULL;
3885       goto out;
3886     }
3887
3888     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3889     if (!channel) {
3890       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3891       if (!channel) {
3892         if (server->server_type == SILC_ROUTER)
3893           SILC_LOG_ERROR(("Received key for non-existent channel %s",
3894                           silc_id_render(id, SILC_ID_CHANNEL)));
3895         goto out;
3896       }
3897     }
3898   }
3899
3900   SILC_LOG_DEBUG(("Saving new channel %s key", channel->channel_name));
3901
3902   tmp = silc_channel_key_get_key(payload, &tmp_len);
3903   if (!tmp) {
3904     channel = NULL;
3905     goto out;
3906   }
3907
3908   cipher = silc_channel_key_get_cipher(payload, NULL);
3909   if (!cipher) {
3910     channel = NULL;
3911     goto out;
3912   }
3913
3914   /* Remove old key if exists */
3915   if (channel->key) {
3916     memset(channel->key, 0, channel->key_len / 8);
3917     silc_free(channel->key);
3918     silc_cipher_free(channel->channel_key);
3919   }
3920
3921   /* Create new cipher */
3922   if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3923     channel->channel_key = NULL;
3924     channel = NULL;
3925     goto out;
3926   }
3927
3928   if (channel->cipher)
3929     silc_free(channel->cipher);
3930   channel->cipher = strdup(cipher);
3931
3932   /* Save the key */
3933   channel->key_len = tmp_len * 8;
3934   channel->key = silc_memdup(tmp, tmp_len);
3935   silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3936
3937   /* Generate HMAC key from the channel key data and set it */
3938   if (!channel->hmac)
3939     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3940   silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3941   silc_hmac_set_key(channel->hmac, hash,
3942                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3943
3944   memset(hash, 0, sizeof(hash));
3945   memset(tmp, 0, tmp_len);
3946
3947   if (server->server_type == SILC_ROUTER) {
3948     if (!channel->rekey)
3949       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3950     channel->rekey->channel = channel;
3951     if (channel->rekey->task)
3952       silc_schedule_task_del(server->schedule, channel->rekey->task);
3953
3954     channel->rekey->task =
3955       silc_schedule_task_add(server->schedule, 0,
3956                              silc_server_channel_key_rekey,
3957                              (void *)channel->rekey,
3958                              server->config->channel_rekey_secs, 0,
3959                              SILC_TASK_TIMEOUT,
3960                              SILC_TASK_PRI_NORMAL);
3961   }
3962
3963  out:
3964   silc_free(id);
3965   if (payload)
3966     silc_channel_key_payload_free(payload);
3967
3968   return channel;
3969 }
3970
3971 /* Heartbeat callback. This function is set as argument for the
3972    silc_socket_set_heartbeat function. The library will call this function
3973    at the set time interval. */
3974
3975 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3976                                    void *hb_context)
3977 {
3978   SilcServer server = hb_context;
3979
3980   SILC_LOG_DEBUG(("Sending heartbeat to %s:%d (%s)", sock->hostname,
3981                  sock->port, sock->ip));
3982
3983   /* Send the heartbeat */
3984   silc_server_send_heartbeat(server, sock);
3985 }
3986
3987 /* Returns assembled of all servers in the given ID list. The packet's
3988    form is dictated by the New ID payload. */
3989
3990 static void silc_server_announce_get_servers(SilcServer server,
3991                                              SilcServerEntry remote,
3992                                              SilcIDList id_list,
3993                                              SilcBuffer *servers,
3994                                              unsigned long creation_time)
3995 {
3996   SilcIDCacheList list;
3997   SilcIDCacheEntry id_cache;
3998   SilcServerEntry entry;
3999   SilcBuffer idp;
4000
4001   /* Go through all clients in the list */
4002   if (silc_idcache_get_all(id_list->servers, &list)) {
4003     if (silc_idcache_list_first(list, &id_cache)) {
4004       while (id_cache) {
4005         entry = (SilcServerEntry)id_cache->context;
4006
4007         /* Do not announce the one we've sending our announcements and
4008            do not announce ourself. Also check the creation time if it's
4009            provided. */
4010         if ((entry == remote) || (entry == server->id_entry) ||
4011             (creation_time && entry->data.created < creation_time)) {
4012           if (!silc_idcache_list_next(list, &id_cache))
4013             break;
4014           continue;
4015         }
4016
4017         idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
4018
4019         *servers = silc_buffer_realloc(*servers,
4020                                        (*servers ?
4021                                         (*servers)->truelen + idp->len :
4022                                         idp->len));
4023         silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
4024         silc_buffer_put(*servers, idp->data, idp->len);
4025         silc_buffer_pull(*servers, idp->len);
4026         silc_buffer_free(idp);
4027
4028         if (!silc_idcache_list_next(list, &id_cache))
4029           break;
4030       }
4031     }
4032
4033     silc_idcache_list_free(list);
4034   }
4035 }
4036
4037 static SilcBuffer
4038 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
4039 {
4040   va_list ap;
4041   SilcBuffer p;
4042
4043   va_start(ap, argc);
4044   p = silc_notify_payload_encode(notify, argc, ap);
4045   va_end(ap);
4046
4047   return p;
4048 }
4049
4050 /* This function is used by router to announce existing servers to our
4051    primary router when we've connected to it. If `creation_time' is non-zero
4052    then only the servers that has been created after the `creation_time'
4053    will be announced. */
4054
4055 void silc_server_announce_servers(SilcServer server, bool global,
4056                                   unsigned long creation_time,
4057                                   SilcSocketConnection remote)
4058 {
4059   SilcBuffer servers = NULL;
4060
4061   SILC_LOG_DEBUG(("Announcing servers"));
4062
4063   /* Get servers in local list */
4064   silc_server_announce_get_servers(server, remote->user_data,
4065                                    server->local_list, &servers,
4066                                    creation_time);
4067
4068   if (global)
4069     /* Get servers in global list */
4070     silc_server_announce_get_servers(server, remote->user_data,
4071                                      server->global_list, &servers,
4072                                      creation_time);
4073
4074   if (servers) {
4075     silc_buffer_push(servers, servers->data - servers->head);
4076     SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
4077
4078     /* Send the packet */
4079     silc_server_packet_send(server, remote,
4080                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4081                             servers->data, servers->len, TRUE);
4082
4083     silc_buffer_free(servers);
4084   }
4085 }
4086
4087 /* Returns assembled packet of all clients in the given ID list. The
4088    packet's form is dictated by the New ID Payload. */
4089
4090 static void silc_server_announce_get_clients(SilcServer server,
4091                                              SilcIDList id_list,
4092                                              SilcBuffer *clients,
4093                                              SilcBuffer *umodes,
4094                                              unsigned long creation_time)
4095 {
4096   SilcIDCacheList list;
4097   SilcIDCacheEntry id_cache;
4098   SilcClientEntry client;
4099   SilcBuffer idp;
4100   SilcBuffer tmp;
4101   unsigned char mode[4];
4102
4103   /* Go through all clients in the list */
4104   if (silc_idcache_get_all(id_list->clients, &list)) {
4105     if (silc_idcache_list_first(list, &id_cache)) {
4106       while (id_cache) {
4107         client = (SilcClientEntry)id_cache->context;
4108
4109         if (creation_time && client->data.created < creation_time) {
4110           if (!silc_idcache_list_next(list, &id_cache))
4111             break;
4112           continue;
4113         }
4114         if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED) &&
4115             !client->connection && !client->router && !SILC_IS_LOCAL(client)) {
4116           if (!silc_idcache_list_next(list, &id_cache))
4117             break;
4118           continue;
4119         }
4120
4121         idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4122
4123         *clients = silc_buffer_realloc(*clients,
4124                                        (*clients ?
4125                                         (*clients)->truelen + idp->len :
4126                                         idp->len));
4127         silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
4128         silc_buffer_put(*clients, idp->data, idp->len);
4129         silc_buffer_pull(*clients, idp->len);
4130
4131         SILC_PUT32_MSB(client->mode, mode);
4132         tmp =
4133           silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
4134                                              2, idp->data, idp->len,
4135                                              mode, 4);
4136         *umodes = silc_buffer_realloc(*umodes,
4137                                       (*umodes ?
4138                                        (*umodes)->truelen + tmp->len :
4139                                        tmp->len));
4140         silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
4141         silc_buffer_put(*umodes, tmp->data, tmp->len);
4142         silc_buffer_pull(*umodes, tmp->len);
4143         silc_buffer_free(tmp);
4144
4145         silc_buffer_free(idp);
4146
4147         if (!silc_idcache_list_next(list, &id_cache))
4148           break;
4149       }
4150     }
4151
4152     silc_idcache_list_free(list);
4153   }
4154 }
4155
4156 /* This function is used to announce our existing clients to our router
4157    when we've connected to it. If `creation_time' is non-zero then only
4158    the clients that has been created after the `creation_time' will be
4159    announced. */
4160
4161 void silc_server_announce_clients(SilcServer server,
4162                                   unsigned long creation_time,
4163                                   SilcSocketConnection remote)
4164 {
4165   SilcBuffer clients = NULL;
4166   SilcBuffer umodes = NULL;
4167
4168   SILC_LOG_DEBUG(("Announcing clients"));
4169
4170   /* Get clients in local list */
4171   silc_server_announce_get_clients(server, server->local_list,
4172                                    &clients, &umodes, creation_time);
4173
4174   /* As router we announce our global list as well */
4175   if (server->server_type == SILC_ROUTER)
4176     silc_server_announce_get_clients(server, server->global_list,
4177                                      &clients, &umodes, creation_time);
4178
4179   if (clients) {
4180     silc_buffer_push(clients, clients->data - clients->head);
4181     SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
4182
4183     /* Send the packet */
4184     silc_server_packet_send(server, remote,
4185                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4186                             clients->data, clients->len, TRUE);
4187
4188     silc_buffer_free(clients);
4189   }
4190
4191   if (umodes) {
4192     silc_buffer_push(umodes, umodes->data - umodes->head);
4193     SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
4194
4195     /* Send the packet */
4196     silc_server_packet_send(server, remote,
4197                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4198                             umodes->data, umodes->len, TRUE);
4199
4200     silc_buffer_free(umodes);
4201   }
4202 }
4203
4204 /* Returns channel's topic for announcing it */
4205
4206 void silc_server_announce_get_channel_topic(SilcServer server,
4207                                             SilcChannelEntry channel,
4208                                             SilcBuffer *topic)
4209 {
4210   SilcBuffer chidp;
4211
4212   if (channel->topic) {
4213     chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4214     *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
4215                                                 chidp->data, chidp->len,
4216                                                 channel->topic,
4217                                                 strlen(channel->topic));
4218     silc_buffer_free(chidp);
4219   }
4220 }
4221
4222 /* Returns assembled packets for channel users of the `channel'. */
4223
4224 void silc_server_announce_get_channel_users(SilcServer server,
4225                                             SilcChannelEntry channel,
4226                                             SilcBuffer *channel_modes,
4227                                             SilcBuffer *channel_users,
4228                                             SilcBuffer *channel_users_modes)
4229 {
4230   SilcChannelClientEntry chl;
4231   SilcHashTableList htl;
4232   SilcBuffer chidp, clidp, csidp;
4233   SilcBuffer tmp, fkey = NULL;
4234   int len;
4235   unsigned char mode[4];
4236   char *hmac;
4237
4238   SILC_LOG_DEBUG(("Start"));
4239
4240   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4241   csidp = silc_id_payload_encode(server->id, SILC_ID_SERVER);
4242
4243   /* CMODE notify */
4244   SILC_PUT32_MSB(channel->mode, mode);
4245   hmac = channel->hmac ? (char *)silc_hmac_get_name(channel->hmac) : NULL;
4246   if (channel->founder_key)
4247     fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4248   tmp =
4249     silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CMODE_CHANGE,
4250                                        6, csidp->data, csidp->len,
4251                                        mode, sizeof(mode),
4252                                        NULL, 0,
4253                                        hmac, hmac ? strlen(hmac) : 0,
4254                                        channel->passphrase,
4255                                        channel->passphrase ?
4256                                        strlen(channel->passphrase) : 0,
4257                                        fkey ? fkey->data : NULL,
4258                                        fkey ? fkey->len : 0);
4259   len = tmp->len;
4260   *channel_modes =
4261     silc_buffer_realloc(*channel_modes,
4262                         (*channel_modes ?
4263                          (*channel_modes)->truelen + len : len));
4264   silc_buffer_pull_tail(*channel_modes,
4265                         ((*channel_modes)->end -
4266                          (*channel_modes)->data));
4267   silc_buffer_put(*channel_modes, tmp->data, tmp->len);
4268   silc_buffer_pull(*channel_modes, len);
4269   silc_buffer_free(tmp);
4270   silc_buffer_free(fkey);
4271   fkey = NULL;
4272
4273   /* Now find all users on the channel */
4274   silc_hash_table_list(channel->user_list, &htl);
4275   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4276     clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4277
4278     /* JOIN Notify */
4279     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
4280                                              clidp->data, clidp->len,
4281                                              chidp->data, chidp->len);
4282     len = tmp->len;
4283     *channel_users =
4284       silc_buffer_realloc(*channel_users,
4285                           (*channel_users ?
4286                            (*channel_users)->truelen + len : len));
4287     silc_buffer_pull_tail(*channel_users,
4288                           ((*channel_users)->end -
4289                            (*channel_users)->data));
4290
4291     silc_buffer_put(*channel_users, tmp->data, tmp->len);
4292     silc_buffer_pull(*channel_users, len);
4293     silc_buffer_free(tmp);
4294
4295     /* CUMODE notify for mode change on the channel */
4296     SILC_PUT32_MSB(chl->mode, mode);
4297     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && channel->founder_key)
4298       fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4299     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
4300                                              4, csidp->data, csidp->len,
4301                                              mode, sizeof(mode),
4302                                              clidp->data, clidp->len,
4303                                              fkey ? fkey->data : NULL,
4304                                              fkey ? fkey->len : 0);
4305     len = tmp->len;
4306     *channel_users_modes =
4307       silc_buffer_realloc(*channel_users_modes,
4308                           (*channel_users_modes ?
4309                            (*channel_users_modes)->truelen + len : len));
4310     silc_buffer_pull_tail(*channel_users_modes,
4311                           ((*channel_users_modes)->end -
4312                            (*channel_users_modes)->data));
4313
4314     silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
4315     silc_buffer_pull(*channel_users_modes, len);
4316     silc_buffer_free(tmp);
4317     silc_buffer_free(fkey);
4318     fkey = NULL;
4319     silc_buffer_free(clidp);
4320   }
4321   silc_hash_table_list_reset(&htl);
4322   silc_buffer_free(chidp);
4323   silc_buffer_free(csidp);
4324 }
4325
4326 /* Returns assembled packets for all channels and users on those channels
4327    from the given ID List. The packets are in the form dictated by the
4328    New Channel and New Channel User payloads. */
4329
4330 void silc_server_announce_get_channels(SilcServer server,
4331                                        SilcIDList id_list,
4332                                        SilcBuffer *channels,
4333                                        SilcBuffer **channel_modes,
4334                                        SilcBuffer *channel_users,
4335                                        SilcBuffer **channel_users_modes,
4336                                        SilcUInt32 *channel_users_modes_c,
4337                                        SilcBuffer **channel_topics,
4338                                        SilcChannelID ***channel_ids,
4339                                        unsigned long creation_time)
4340 {
4341   SilcIDCacheList list;
4342   SilcIDCacheEntry id_cache;
4343   SilcChannelEntry channel;
4344   unsigned char *cid;
4345   SilcUInt32 id_len;
4346   SilcUInt16 name_len;
4347   int len;
4348   int i = *channel_users_modes_c;
4349   bool announce;
4350
4351   SILC_LOG_DEBUG(("Start"));
4352
4353   /* Go through all channels in the list */
4354   if (silc_idcache_get_all(id_list->channels, &list)) {
4355     if (silc_idcache_list_first(list, &id_cache)) {
4356       while (id_cache) {
4357         channel = (SilcChannelEntry)id_cache->context;
4358
4359         if (creation_time && channel->created < creation_time)
4360           announce = FALSE;
4361         else
4362           announce = TRUE;
4363
4364         cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4365         id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4366         name_len = strlen(channel->channel_name);
4367
4368         if (announce) {
4369           len = 4 + name_len + id_len + 4;
4370           *channels =
4371             silc_buffer_realloc(*channels,
4372                                 (*channels ? (*channels)->truelen +
4373                                  len : len));
4374           silc_buffer_pull_tail(*channels,
4375                                 ((*channels)->end - (*channels)->data));
4376           silc_buffer_format(*channels,
4377                              SILC_STR_UI_SHORT(name_len),
4378                              SILC_STR_UI_XNSTRING(channel->channel_name,
4379                                                   name_len),
4380                              SILC_STR_UI_SHORT(id_len),
4381                              SILC_STR_UI_XNSTRING(cid, id_len),
4382                              SILC_STR_UI_INT(channel->mode),
4383                              SILC_STR_END);
4384           silc_buffer_pull(*channels, len);
4385         }
4386
4387         if (creation_time && channel->updated < creation_time)
4388           announce = FALSE;
4389         else
4390           announce = TRUE;
4391
4392         if (announce) {
4393           /* Channel user modes */
4394           *channel_users_modes = silc_realloc(*channel_users_modes,
4395                                               sizeof(**channel_users_modes) *
4396                                               (i + 1));
4397           (*channel_users_modes)[i] = NULL;
4398           *channel_modes = silc_realloc(*channel_modes,
4399                                         sizeof(**channel_modes) * (i + 1));
4400           (*channel_modes)[i] = NULL;
4401           *channel_ids = silc_realloc(*channel_ids,
4402                                       sizeof(**channel_ids) * (i + 1));
4403           (*channel_ids)[i] = NULL;
4404           silc_server_announce_get_channel_users(server, channel,
4405                                                  &(*channel_modes)[i],
4406                                                  channel_users,
4407                                                  &(*channel_users_modes)[i]);
4408           (*channel_ids)[i] = channel->id;
4409
4410           /* Channel's topic */
4411           *channel_topics = silc_realloc(*channel_topics,
4412                                          sizeof(**channel_topics) * (i + 1));
4413           (*channel_topics)[i] = NULL;
4414           silc_server_announce_get_channel_topic(server, channel,
4415                                                  &(*channel_topics)[i]);
4416           (*channel_users_modes_c)++;
4417
4418           silc_free(cid);
4419
4420           i++;
4421         }
4422
4423         if (!silc_idcache_list_next(list, &id_cache))
4424           break;
4425       }
4426     }
4427
4428     silc_idcache_list_free(list);
4429   }
4430 }
4431
4432 /* This function is used to announce our existing channels to our router
4433    when we've connected to it. This also announces the users on the
4434    channels to the router. If the `creation_time' is non-zero only the
4435    channels that was created after the `creation_time' are announced.
4436    Note that the channel users are still announced even if the `creation_time'
4437    was provided. */
4438
4439 void silc_server_announce_channels(SilcServer server,
4440                                    unsigned long creation_time,
4441                                    SilcSocketConnection remote)
4442 {
4443   SilcBuffer channels = NULL, *channel_modes = NULL, channel_users = NULL;
4444   SilcBuffer *channel_users_modes = NULL;
4445   SilcBuffer *channel_topics = NULL;
4446   SilcUInt32 channel_users_modes_c = 0;
4447   SilcChannelID **channel_ids = NULL;
4448
4449   SILC_LOG_DEBUG(("Announcing channels and channel users"));
4450
4451   /* Get channels and channel users in local list */
4452   silc_server_announce_get_channels(server, server->local_list,
4453                                     &channels, &channel_modes,
4454                                     &channel_users,
4455                                     &channel_users_modes,
4456                                     &channel_users_modes_c,
4457                                     &channel_topics,
4458                                     &channel_ids, creation_time);
4459
4460   /* Get channels and channel users in global list */
4461   if (server->server_type != SILC_SERVER)
4462     silc_server_announce_get_channels(server, server->global_list,
4463                                       &channels, &channel_modes,
4464                                       &channel_users,
4465                                       &channel_users_modes,
4466                                       &channel_users_modes_c,
4467                                       &channel_topics,
4468                                       &channel_ids, creation_time);
4469
4470   if (channels) {
4471     silc_buffer_push(channels, channels->data - channels->head);
4472     SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
4473
4474     /* Send the packet */
4475     silc_server_packet_send(server, remote,
4476                             SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
4477                             channels->data, channels->len,
4478                             FALSE);
4479
4480     silc_buffer_free(channels);
4481   }
4482
4483   if (channel_users) {
4484     silc_buffer_push(channel_users, channel_users->data - channel_users->head);
4485     SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
4486                      channel_users->len);
4487
4488     /* Send the packet */
4489     silc_server_packet_send(server, remote,
4490                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4491                             channel_users->data, channel_users->len,
4492                             FALSE);
4493
4494     silc_buffer_free(channel_users);
4495   }
4496
4497   if (channel_modes) {
4498     int i;
4499
4500     for (i = 0; i < channel_users_modes_c; i++) {
4501       if (!channel_modes[i])
4502         continue;
4503       silc_buffer_push(channel_modes[i],
4504                        channel_modes[i]->data -
4505                        channel_modes[i]->head);
4506       SILC_LOG_HEXDUMP(("channel modes"), channel_modes[i]->data,
4507                        channel_modes[i]->len);
4508       silc_server_packet_send_dest(server, remote,
4509                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4510                                    channel_ids[i], SILC_ID_CHANNEL,
4511                                    channel_modes[i]->data,
4512                                    channel_modes[i]->len,
4513                                    FALSE);
4514       silc_buffer_free(channel_modes[i]);
4515     }
4516     silc_free(channel_modes);
4517   }
4518
4519   if (channel_users_modes) {
4520     int i;
4521
4522     for (i = 0; i < channel_users_modes_c; i++) {
4523       if (!channel_users_modes[i])
4524         continue;
4525       silc_buffer_push(channel_users_modes[i],
4526                        channel_users_modes[i]->data -
4527                        channel_users_modes[i]->head);
4528       SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
4529                        channel_users_modes[i]->len);
4530       silc_server_packet_send_dest(server, remote,
4531                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4532                                    channel_ids[i], SILC_ID_CHANNEL,
4533                                    channel_users_modes[i]->data,
4534                                    channel_users_modes[i]->len,
4535                                    FALSE);
4536       silc_buffer_free(channel_users_modes[i]);
4537     }
4538     silc_free(channel_users_modes);
4539   }
4540
4541   if (channel_topics) {
4542     int i;
4543
4544     for (i = 0; i < channel_users_modes_c; i++) {
4545       if (!channel_topics[i])
4546         continue;
4547
4548       silc_buffer_push(channel_topics[i],
4549                        channel_topics[i]->data -
4550                        channel_topics[i]->head);
4551       SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
4552                        channel_topics[i]->len);
4553       silc_server_packet_send_dest(server, remote,
4554                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4555                                    channel_ids[i], SILC_ID_CHANNEL,
4556                                    channel_topics[i]->data,
4557                                    channel_topics[i]->len,
4558                                    FALSE);
4559       silc_buffer_free(channel_topics[i]);
4560     }
4561     silc_free(channel_topics);
4562   }
4563
4564   silc_free(channel_ids);
4565 }
4566
4567 /* Failure timeout callback. If this is called then we will immediately
4568    process the received failure. We always process the failure with timeout
4569    since we do not want to blindly trust to received failure packets.
4570    This won't be called (the timeout is cancelled) if the failure was
4571    bogus (it is bogus if remote does not close the connection after sending
4572    the failure). */
4573
4574 SILC_TASK_CALLBACK(silc_server_failure_callback)
4575 {
4576   SilcServer server = app_context;
4577   SilcServerFailureContext f = (SilcServerFailureContext)context;
4578
4579   if (f->sock->protocol) {
4580     f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
4581     silc_protocol_execute(f->sock->protocol, server->schedule, 0, 0);
4582   }
4583
4584   silc_socket_free(f->sock);
4585   silc_free(f);
4586 }
4587
4588 /* Assembles user list and users mode list from the `channel'. */
4589
4590 bool silc_server_get_users_on_channel(SilcServer server,
4591                                       SilcChannelEntry channel,
4592                                       SilcBuffer *user_list,
4593                                       SilcBuffer *mode_list,
4594                                       SilcUInt32 *user_count)
4595 {
4596   SilcChannelClientEntry chl;
4597   SilcHashTableList htl;
4598   SilcBuffer client_id_list;
4599   SilcBuffer client_mode_list;
4600   SilcBuffer idp;
4601   SilcUInt32 list_count = 0, len = 0;
4602
4603   if (!silc_hash_table_count(channel->user_list))
4604     return FALSE;
4605
4606   silc_hash_table_list(channel->user_list, &htl);
4607   while (silc_hash_table_get(&htl, NULL, (void *)&chl))
4608     len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
4609   silc_hash_table_list_reset(&htl);
4610
4611   client_id_list = silc_buffer_alloc(len);
4612   client_mode_list =
4613     silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
4614   silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
4615   silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
4616
4617   silc_hash_table_list(channel->user_list, &htl);
4618   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4619     /* Client ID */
4620     idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4621     silc_buffer_put(client_id_list, idp->data, idp->len);
4622     silc_buffer_pull(client_id_list, idp->len);
4623     silc_buffer_free(idp);
4624
4625     /* Client's mode on channel */
4626     SILC_PUT32_MSB(chl->mode, client_mode_list->data);
4627     silc_buffer_pull(client_mode_list, 4);
4628
4629     list_count++;
4630   }
4631   silc_hash_table_list_reset(&htl);
4632   silc_buffer_push(client_id_list,
4633                    client_id_list->data - client_id_list->head);
4634   silc_buffer_push(client_mode_list,
4635                    client_mode_list->data - client_mode_list->head);
4636
4637   *user_list = client_id_list;
4638   *mode_list = client_mode_list;
4639   *user_count = list_count;
4640   return TRUE;
4641 }
4642
4643 /* Saves users and their modes to the `channel'. */
4644
4645 void silc_server_save_users_on_channel(SilcServer server,
4646                                        SilcSocketConnection sock,
4647                                        SilcChannelEntry channel,
4648                                        SilcClientID *noadd,
4649                                        SilcBuffer user_list,
4650                                        SilcBuffer mode_list,
4651                                        SilcUInt32 user_count)
4652 {
4653   int i;
4654   SilcUInt16 idp_len;
4655   SilcUInt32 mode;
4656   SilcClientID *client_id;
4657   SilcClientEntry client;
4658   SilcIDCacheEntry cache;
4659   SilcChannelClientEntry chl;
4660
4661   SILC_LOG_DEBUG(("Saving %d users on %s channel", user_count,
4662                   channel->channel_name));
4663
4664   for (i = 0; i < user_count; i++) {
4665     /* Client ID */
4666     SILC_GET16_MSB(idp_len, user_list->data + 2);
4667     idp_len += 4;
4668     client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
4669     silc_buffer_pull(user_list, idp_len);
4670     if (!client_id)
4671       continue;
4672
4673     /* Mode */
4674     SILC_GET32_MSB(mode, mode_list->data);
4675     silc_buffer_pull(mode_list, 4);
4676
4677     if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
4678       silc_free(client_id);
4679       continue;
4680     }
4681
4682     cache = NULL;
4683
4684     /* Check if we have this client cached already. */
4685     client = silc_idlist_find_client_by_id(server->local_list, client_id,
4686                                            server->server_type, &cache);
4687     if (!client)
4688       client = silc_idlist_find_client_by_id(server->global_list,
4689                                              client_id, server->server_type,
4690                                              &cache);
4691     if (!client) {
4692       /* If router did not find such Client ID in its lists then this must
4693          be bogus client or some router in the net is buggy. */
4694       if (server->server_type != SILC_SERVER) {
4695         silc_free(client_id);
4696         continue;
4697       }
4698
4699       /* We don't have that client anywhere, add it. The client is added
4700          to global list since server didn't have it in the lists so it must be
4701          global. */
4702       client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
4703                                       silc_id_dup(client_id, SILC_ID_CLIENT),
4704                                       sock->user_data, NULL, 0);
4705       if (!client) {
4706         SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
4707         silc_free(client_id);
4708         continue;
4709       }
4710
4711       client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
4712     }
4713
4714     if (cache)
4715       cache->expire = 0;
4716     silc_free(client_id);
4717
4718     if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED)) {
4719       SILC_LOG_ERROR(("Attempting to add unregistered client to channel ",
4720                       "%s", channel->channel_name));
4721       continue;
4722     }
4723
4724     if (!silc_server_client_on_channel(client, channel, &chl)) {
4725       /* Client was not on the channel, add it. */
4726       chl = silc_calloc(1, sizeof(*chl));
4727       chl->client = client;
4728       chl->mode = mode;
4729       chl->channel = channel;
4730       silc_hash_table_add(channel->user_list, chl->client, chl);
4731       silc_hash_table_add(client->channels, chl->channel, chl);
4732       channel->user_count++;
4733     } else {
4734       /* Update mode */
4735       chl->mode = mode;
4736     }
4737   }
4738 }
4739
4740 /* Saves channels and channels user modes to the `client'.  Removes
4741    the client from those channels that are not sent in the list but
4742    it has joined. */
4743
4744 void silc_server_save_user_channels(SilcServer server,
4745                                     SilcSocketConnection sock,
4746                                     SilcClientEntry client,
4747                                     SilcBuffer channels,
4748                                     SilcBuffer channels_user_modes)
4749 {
4750   SilcDList ch;
4751   SilcUInt32 *chumodes;
4752   SilcChannelPayload entry;
4753   SilcChannelEntry channel;
4754   SilcChannelID *channel_id;
4755   SilcChannelClientEntry chl;
4756   SilcHashTable ht = NULL;
4757   SilcHashTableList htl;
4758   char *name;
4759   int i = 0;
4760
4761   if (!channels || !channels_user_modes ||
4762       !(client->data.status & SILC_IDLIST_STATUS_REGISTERED))
4763     goto out;
4764
4765   ch = silc_channel_payload_parse_list(channels->data, channels->len);
4766   if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4767                                &chumodes)) {
4768     ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4769                                NULL, NULL, NULL, TRUE);
4770     silc_dlist_start(ch);
4771     while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4772       /* Check if we have this channel, and add it if we don't have it.
4773          Also add the client on the channel unless it is there already. */
4774       channel_id = silc_channel_get_id_parse(entry);
4775       channel = silc_idlist_find_channel_by_id(server->local_list,
4776                                                channel_id, NULL);
4777       if (!channel)
4778         channel = silc_idlist_find_channel_by_id(server->global_list,
4779                                                  channel_id, NULL);
4780       if (!channel) {
4781         if (server->server_type != SILC_SERVER) {
4782           silc_free(channel_id);
4783           i++;
4784           continue;
4785         }
4786
4787         /* We don't have that channel anywhere, add it. */
4788         name = silc_channel_get_name(entry, NULL);
4789         channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4790                                           channel_id, server->router,
4791                                           NULL, NULL, 0);
4792         if (!channel) {
4793           silc_free(channel_id);
4794           i++;
4795           continue;
4796         }
4797         channel_id = NULL;
4798       }
4799
4800       channel->mode = silc_channel_get_mode(entry);
4801
4802       /* Add the client on the channel */
4803       if (!silc_server_client_on_channel(client, channel, &chl)) {
4804         chl = silc_calloc(1, sizeof(*chl));
4805         chl->client = client;
4806         chl->mode = chumodes[i++];
4807         chl->channel = channel;
4808         silc_hash_table_add(channel->user_list, chl->client, chl);
4809         silc_hash_table_add(client->channels, chl->channel, chl);
4810         channel->user_count++;
4811       } else {
4812         /* Update mode */
4813         chl->mode = chumodes[i++];
4814       }
4815
4816       silc_hash_table_add(ht, channel, channel);
4817       silc_free(channel_id);
4818     }
4819     silc_channel_payload_list_free(ch);
4820     silc_free(chumodes);
4821   }
4822
4823  out:
4824   /* Go through the list again and remove client from channels that
4825      are no part of the list. */
4826   if (ht) {
4827     silc_hash_table_list(client->channels, &htl);
4828     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4829       if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4830         silc_hash_table_del(chl->channel->user_list, chl->client);
4831         silc_hash_table_del(chl->client->channels, chl->channel);
4832         silc_free(chl);
4833       }
4834     }
4835     silc_hash_table_list_reset(&htl);
4836     silc_hash_table_free(ht);
4837   } else {
4838     silc_hash_table_list(client->channels, &htl);
4839     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4840       silc_hash_table_del(chl->channel->user_list, chl->client);
4841       silc_hash_table_del(chl->client->channels, chl->channel);
4842       silc_free(chl);
4843     }
4844     silc_hash_table_list_reset(&htl);
4845   }
4846 }
4847
4848 /* Lookups route to the client indicated by the `id_data'. The connection
4849    object and internal data object is returned. Returns NULL if route
4850    could not be found to the client. If the `client_id' is specified then
4851    it is used and the `id_data' is ignored. */
4852
4853 SilcSocketConnection
4854 silc_server_get_client_route(SilcServer server,
4855                              unsigned char *id_data,
4856                              SilcUInt32 id_len,
4857                              SilcClientID *client_id,
4858                              SilcIDListData *idata,
4859                              SilcClientEntry *client_entry)
4860 {
4861   SilcClientID *id;
4862   SilcClientEntry client;
4863
4864   SILC_LOG_DEBUG(("Start"));
4865
4866   if (client_entry)
4867     *client_entry = NULL;
4868
4869   /* Decode destination Client ID */
4870   if (!client_id) {
4871     id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4872     if (!id) {
4873       SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4874       return NULL;
4875     }
4876   } else {
4877     id = silc_id_dup(client_id, SILC_ID_CLIENT);
4878   }
4879
4880   /* If the destination belongs to our server we don't have to route
4881      the packet anywhere but to send it to the local destination. */
4882   client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4883   if (client) {
4884     silc_free(id);
4885
4886     /* If we are router and the client has router then the client is in
4887        our cell but not directly connected to us. */
4888     if (server->server_type == SILC_ROUTER && client->router) {
4889       /* We are of course in this case the client's router thus the route
4890          to the client is the server who owns the client. So, we will send
4891          the packet to that server. */
4892       if (idata)
4893         *idata = (SilcIDListData)client->router;
4894       return client->router->connection;
4895     }
4896
4897     /* Seems that client really is directly connected to us */
4898     if (idata)
4899       *idata = (SilcIDListData)client;
4900     if (client_entry)
4901       *client_entry = client;
4902     return client->connection;
4903   }
4904
4905   /* Destination belongs to someone not in this server. If we are normal
4906      server our action is to send the packet to our router. */
4907   if (server->server_type != SILC_ROUTER && !server->standalone) {
4908     silc_free(id);
4909     if (idata)
4910       *idata = (SilcIDListData)server->router;
4911     return SILC_PRIMARY_ROUTE(server);
4912   }
4913
4914   /* We are router and we will perform route lookup for the destination
4915      and send the packet to fastest route. */
4916   if (server->server_type == SILC_ROUTER && !server->standalone) {
4917     /* Check first that the ID is valid */
4918     client = silc_idlist_find_client_by_id(server->global_list, id,
4919                                            TRUE, NULL);
4920     if (client) {
4921       SilcSocketConnection dst_sock;
4922
4923       dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4924
4925       silc_free(id);
4926       if (idata)
4927         *idata = (SilcIDListData)dst_sock->user_data;
4928       return dst_sock;
4929     }
4930   }
4931
4932   silc_free(id);
4933   return NULL;
4934 }
4935
4936 /* Encodes and returns channel list of channels the `client' has joined.
4937    Secret channels are not put to the list. */
4938
4939 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4940                                                SilcClientEntry client,
4941                                                bool get_private,
4942                                                bool get_secret,
4943                                                SilcBuffer *user_mode_list)
4944 {
4945   SilcBuffer buffer = NULL;
4946   SilcChannelEntry channel;
4947   SilcChannelClientEntry chl;
4948   SilcHashTableList htl;
4949   unsigned char *cid;
4950   SilcUInt32 id_len;
4951   SilcUInt16 name_len;
4952   int len;
4953
4954   if (user_mode_list)
4955     *user_mode_list = NULL;
4956
4957   silc_hash_table_list(client->channels, &htl);
4958   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4959     channel = chl->channel;
4960
4961     if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4962       continue;
4963     if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4964       continue;
4965
4966     cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4967     id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4968     name_len = strlen(channel->channel_name);
4969
4970     len = 4 + name_len + id_len + 4;
4971     buffer = silc_buffer_realloc(buffer,
4972                                  (buffer ? buffer->truelen + len : len));
4973     silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4974     silc_buffer_format(buffer,
4975                        SILC_STR_UI_SHORT(name_len),
4976                        SILC_STR_UI_XNSTRING(channel->channel_name,
4977                                             name_len),
4978                        SILC_STR_UI_SHORT(id_len),
4979                        SILC_STR_UI_XNSTRING(cid, id_len),
4980                        SILC_STR_UI_INT(chl->channel->mode),
4981                        SILC_STR_END);
4982     silc_buffer_pull(buffer, len);
4983     silc_free(cid);
4984
4985     if (user_mode_list) {
4986       *user_mode_list = silc_buffer_realloc(*user_mode_list,
4987                                             (*user_mode_list ?
4988                                              (*user_mode_list)->truelen + 4 :
4989                                              4));
4990       silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
4991                                               (*user_mode_list)->data));
4992       SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
4993       silc_buffer_pull(*user_mode_list, 4);
4994     }
4995   }
4996   silc_hash_table_list_reset(&htl);
4997
4998   if (buffer)
4999     silc_buffer_push(buffer, buffer->data - buffer->head);
5000   if (user_mode_list && *user_mode_list)
5001     silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
5002                                        (*user_mode_list)->head));
5003
5004   return buffer;
5005 }
5006
5007 /* A timeout callback for the re-key. We will be the initiator of the
5008    re-key protocol. */
5009
5010 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_callback)
5011 {
5012   SilcServer server = app_context;
5013   SilcSocketConnection sock = (SilcSocketConnection)context;
5014   SilcIDListData idata = (SilcIDListData)sock->user_data;
5015   SilcProtocol protocol;
5016   SilcServerRekeyInternalContext *proto_ctx;
5017
5018   /* Allocate internal protocol context. This is sent as context
5019      to the protocol. */
5020   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
5021   proto_ctx->server = (void *)server;
5022   proto_ctx->sock = sock;
5023   proto_ctx->responder = FALSE;
5024   proto_ctx->pfs = idata->rekey->pfs;
5025
5026   /* Perform rekey protocol. Will call the final callback after the
5027      protocol is over. */
5028   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
5029                       &protocol, proto_ctx, silc_server_rekey_final);
5030   sock->protocol = protocol;
5031
5032   /* Run the protocol */
5033   silc_protocol_execute(protocol, server->schedule, 0, 0);
5034
5035   SILC_LOG_DEBUG(("Rekey protocol completed"));
5036
5037   /* Re-register re-key timeout */
5038   silc_schedule_task_add(server->schedule, sock->sock,
5039                          silc_server_rekey_callback,
5040                          context, idata->rekey->timeout, 0,
5041                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
5042 }
5043
5044 /* The final callback for the REKEY protocol. This will actually take the
5045    new key material into use. */
5046
5047 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
5048 {
5049   SilcProtocol protocol = (SilcProtocol)context;
5050   SilcServerRekeyInternalContext *ctx =
5051     (SilcServerRekeyInternalContext *)protocol->context;
5052   SilcServer server = (SilcServer)ctx->server;
5053   SilcSocketConnection sock = ctx->sock;
5054
5055   SILC_LOG_DEBUG(("Start"));
5056
5057   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
5058       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
5059     /* Error occured during protocol */
5060     SILC_LOG_ERROR(("Error occurred during rekey protocol"));
5061     silc_protocol_cancel(protocol, server->schedule);
5062     silc_protocol_free(protocol);
5063     sock->protocol = NULL;
5064     if (ctx->packet)
5065       silc_packet_context_free(ctx->packet);
5066     if (ctx->ske)
5067       silc_ske_free(ctx->ske);
5068     silc_free(ctx);
5069     return;
5070   }
5071
5072   /* Purge the outgoing data queue to assure that all rekey packets really
5073      go to the network before we quit the protocol. */
5074   silc_server_packet_queue_purge(server, sock);
5075
5076   /* Cleanup */
5077   silc_protocol_free(protocol);
5078   sock->protocol = NULL;
5079   if (ctx->packet)
5080     silc_packet_context_free(ctx->packet);
5081   if (ctx->ske)
5082     silc_ske_free(ctx->ske);
5083   silc_free(ctx);
5084 }
5085
5086 /* Task callback used to retrieve network statistical information from
5087    router server once in a while. */
5088
5089 SILC_TASK_CALLBACK(silc_server_get_stats)
5090 {
5091   SilcServer server = (SilcServer)context;
5092   SilcBuffer idp, packet;
5093
5094   SILC_LOG_DEBUG(("Retrieving stats from router"));
5095
5096   if (!server->standalone) {
5097     idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
5098     packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
5099                                             ++server->cmd_ident, 1,
5100                                             1, idp->data, idp->len);
5101     silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
5102                             SILC_PACKET_COMMAND, 0, packet->data,
5103                             packet->len, FALSE);
5104     silc_buffer_free(packet);
5105     silc_buffer_free(idp);
5106   }
5107
5108   silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
5109                          server, 120, 0, SILC_TASK_TIMEOUT,
5110                          SILC_TASK_PRI_LOW);
5111 }