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     if (ret == -1) {
2188       SILC_LOG_ERROR(("Error sending packet to connection "
2189                       "%s:%d [%s]", sock->hostname, sock->port,
2190                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2191                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2192                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2193                        "Router")));
2194       return;
2195     }
2196
2197     /* The packet has been sent and now it is time to set the connection
2198        back to only for input. When there is again some outgoing data
2199        available for this connection it will be set for output as well.
2200        This call clears the output setting and sets it only for input. */
2201     SILC_SET_CONNECTION_FOR_INPUT(server->schedule, fd);
2202     SILC_UNSET_OUTBUF_PENDING(sock);
2203
2204     silc_buffer_clear(sock->outbuf);
2205     return;
2206   }
2207
2208   /* Packet receiving */
2209
2210   /* Read some data from connection */
2211   ret = silc_packet_receive(sock);
2212   if (ret < 0) {
2213
2214     if (ret == -1)
2215       SILC_LOG_ERROR(("Error receiving packet from connection "
2216                       "%s:%d [%s] %s", sock->hostname, sock->port,
2217                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2218                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2219                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2220                        "Router"), strerror(errno)));
2221     return;
2222   }
2223
2224   /* EOF */
2225   if (ret == 0) {
2226     SILC_LOG_DEBUG(("Read EOF"));
2227
2228     /* If connection is disconnecting already we will finally
2229        close the connection */
2230     if (SILC_IS_DISCONNECTING(sock)) {
2231       if (sock->user_data)
2232         silc_server_free_sock_user_data(server, sock, NULL);
2233       silc_server_close_connection(server, sock);
2234       return;
2235     }
2236
2237     SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
2238     SILC_SET_DISCONNECTING(sock);
2239
2240     if (sock->user_data) {
2241       char tmp[128];
2242       if (silc_socket_get_error(sock, tmp, sizeof(tmp) - 1))
2243         silc_server_free_sock_user_data(server, sock, tmp);
2244       else
2245         silc_server_free_sock_user_data(server, sock, NULL);
2246     } else if (server->router_conn && server->router_conn->sock == sock &&
2247              !server->router && server->standalone)
2248       silc_schedule_task_add(server->schedule, 0,
2249                              silc_server_connect_to_router,
2250                              server, 1, 0,
2251                              SILC_TASK_TIMEOUT,
2252                              SILC_TASK_PRI_NORMAL);
2253
2254     silc_server_close_connection(server, sock);
2255     return;
2256   }
2257
2258   /* If connection is disconnecting or disconnected we will ignore
2259      what we read. */
2260   if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
2261     SILC_LOG_DEBUG(("Ignoring read data from disconnected connection"));
2262     return;
2263   }
2264
2265   /* Get keys and stuff from ID entry */
2266   idata = (SilcIDListData)sock->user_data;
2267   if (idata) {
2268     cipher = idata->receive_key;
2269     hmac = idata->hmac_receive;
2270     sequence = idata->psn_receive;
2271   }
2272
2273   /* Process the packet. This will call the parser that will then
2274      decrypt and parse the packet. */
2275   ret = silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
2276                                     TRUE : FALSE, cipher, hmac, sequence,
2277                                     silc_server_packet_parse, server);
2278
2279   /* If processing failed the connection is closed. */
2280   if (!ret) {
2281     /* On packet processing errors we may close our primary router
2282        connection but won't become primary router if we are the backup
2283        since this is local error condition. */
2284     if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2285       server->backup_noswitch = TRUE;
2286
2287     if (sock->user_data)
2288       silc_server_free_sock_user_data(server, sock, NULL);
2289     silc_server_close_connection(server, sock);
2290   }
2291 }
2292
2293 /* Parses whole packet, received earlier. */
2294
2295 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
2296 {
2297   SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
2298   SilcServer server = (SilcServer)parse_ctx->context;
2299   SilcSocketConnection sock = parse_ctx->sock;
2300   SilcPacketContext *packet = parse_ctx->packet;
2301   SilcIDListData idata = (SilcIDListData)sock->user_data;
2302   int ret;
2303
2304   server->stat.packets_received++;
2305
2306   /* Parse the packet */
2307   if (parse_ctx->normal)
2308     ret = silc_packet_parse(packet, idata ? idata->receive_key : NULL);
2309   else
2310     ret = silc_packet_parse_special(packet, idata ? idata->receive_key : NULL);
2311
2312   /* If entry is disabled ignore what we got. */
2313   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED &&
2314       ret != SILC_PACKET_HEARTBEAT && ret != SILC_PACKET_RESUME_ROUTER &&
2315       ret != SILC_PACKET_REKEY && ret != SILC_PACKET_REKEY_DONE) {
2316     SILC_LOG_DEBUG(("Connection is disabled"));
2317     goto out;
2318   }
2319
2320   if (ret == SILC_PACKET_NONE) {
2321     SILC_LOG_DEBUG(("Error parsing packet"));
2322     goto out;
2323   }
2324
2325   /* Check that the the current client ID is same as in the client's packet. */
2326   if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
2327     SilcClientEntry client = (SilcClientEntry)sock->user_data;
2328     if (client && client->id && packet->src_id) {
2329       void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
2330                                 packet->src_id_type);
2331       if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
2332         silc_free(id);
2333         SILC_LOG_DEBUG(("Packet source is not same as sender"));
2334         goto out;
2335       }
2336       silc_free(id);
2337     }
2338   }
2339
2340   if (server->server_type == SILC_ROUTER) {
2341     /* Route the packet if it is not destined to us. Other ID types but
2342        server are handled separately after processing them. */
2343     if (packet->dst_id && !(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
2344         packet->dst_id_type == SILC_ID_SERVER &&
2345         sock->type != SILC_SOCKET_TYPE_CLIENT &&
2346         memcmp(packet->dst_id, server->id_string, server->id_string_len)) {
2347
2348       /* Route the packet to fastest route for the destination ID */
2349       void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
2350                                 packet->dst_id_type);
2351       if (!id)
2352         goto out;
2353       silc_server_packet_route(server,
2354                                silc_server_route_get(server, id,
2355                                                      packet->dst_id_type),
2356                                packet);
2357       silc_free(id);
2358       goto out;
2359     }
2360   }
2361
2362   /* Parse the incoming packet type */
2363   silc_server_packet_parse_type(server, sock, packet);
2364
2365   /* Broadcast packet if it is marked as broadcast packet and it is
2366      originated from router and we are router. */
2367   if (server->server_type == SILC_ROUTER &&
2368       sock->type == SILC_SOCKET_TYPE_ROUTER &&
2369       packet->flags & SILC_PACKET_FLAG_BROADCAST) {
2370     /* Broadcast to our primary route */
2371     silc_server_packet_broadcast(server, SILC_PRIMARY_ROUTE(server), packet);
2372
2373     /* If we have backup routers then we need to feed all broadcast
2374        data to those servers. */
2375     silc_server_backup_broadcast(server, sock, packet);
2376   }
2377
2378  out:
2379   silc_packet_context_free(packet);
2380   silc_free(parse_ctx);
2381 }
2382
2383 /* Parser callback called by silc_packet_receive_process. This merely
2384    registers timeout that will handle the actual parsing when appropriate. */
2385
2386 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
2387                               void *context)
2388 {
2389   SilcServer server = (SilcServer)context;
2390   SilcSocketConnection sock = parser_context->sock;
2391   SilcIDListData idata = (SilcIDListData)sock->user_data;
2392   bool ret;
2393
2394   if (idata)
2395     idata->psn_receive = parser_context->packet->sequence + 1;
2396
2397   /* If protocol for this connection is key exchange or rekey then we'll
2398      process all packets synchronously, since there might be packets in
2399      queue that we are not able to decrypt without first processing the
2400      packets before them. */
2401   if ((parser_context->packet->type == SILC_PACKET_REKEY ||
2402        parser_context->packet->type == SILC_PACKET_REKEY_DONE) ||
2403       (sock->protocol && sock->protocol->protocol &&
2404        (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2405         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY))) {
2406     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2407                                   parser_context);
2408
2409     /* Reprocess data since we'll return FALSE here.  This is because
2410        the idata->receive_key might have become valid in the last packet
2411        and we want to call this processor with valid cipher. */
2412     if (idata)
2413       ret = silc_packet_receive_process(
2414                                   sock, server->server_type == SILC_ROUTER ?
2415                                   TRUE : FALSE, idata->receive_key,
2416                                   idata->hmac_receive, idata->psn_receive,
2417                                   silc_server_packet_parse, server);
2418     else
2419       ret = silc_packet_receive_process(
2420                                   sock, server->server_type == SILC_ROUTER ?
2421                                   TRUE : FALSE, NULL, NULL, 0,
2422                                   silc_server_packet_parse, server);
2423
2424     if (!ret) {
2425       /* On packet processing errors we may close our primary router
2426          connection but won't become primary router if we are the backup
2427          since this is local error condition. */
2428       if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2429         server->backup_noswitch = TRUE;
2430
2431       if (sock->user_data)
2432         silc_server_free_sock_user_data(server, sock, NULL);
2433       silc_server_close_connection(server, sock);
2434     }
2435
2436     return FALSE;
2437   }
2438
2439   switch (sock->type) {
2440   case SILC_SOCKET_TYPE_UNKNOWN:
2441   case SILC_SOCKET_TYPE_CLIENT:
2442     /* Parse the packet with timeout */
2443     silc_schedule_task_add(server->schedule, sock->sock,
2444                            silc_server_packet_parse_real,
2445                            (void *)parser_context, 0, 100000,
2446                            SILC_TASK_TIMEOUT,
2447                            SILC_TASK_PRI_NORMAL);
2448     break;
2449   case SILC_SOCKET_TYPE_SERVER:
2450   case SILC_SOCKET_TYPE_ROUTER:
2451     /* Packets from servers are parsed immediately */
2452     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2453                                   parser_context);
2454     break;
2455   default:
2456     return TRUE;
2457   }
2458
2459   return TRUE;
2460 }
2461
2462 /* Parses the packet type and calls what ever routines the packet type
2463    requires. This is done for all incoming packets. */
2464
2465 void silc_server_packet_parse_type(SilcServer server,
2466                                    SilcSocketConnection sock,
2467                                    SilcPacketContext *packet)
2468 {
2469   SilcPacketType type = packet->type;
2470   SilcIDListData idata = (SilcIDListData)sock->user_data;
2471
2472   SILC_LOG_DEBUG(("Received %s packet [flags %d]",
2473                   silc_get_packet_name(type), packet->flags));
2474
2475   /* Parse the packet type */
2476   switch (type) {
2477   case SILC_PACKET_DISCONNECT:
2478     {
2479       SilcStatus status;
2480       char *message = NULL;
2481
2482       if (packet->flags & SILC_PACKET_FLAG_LIST)
2483         break;
2484       if (packet->buffer->len < 1)
2485         break;
2486
2487       status = (SilcStatus)packet->buffer->data[0];
2488       if (packet->buffer->len > 1 &&
2489           silc_utf8_valid(packet->buffer->data + 1, packet->buffer->len - 1))
2490         message = silc_memdup(packet->buffer->data + 1,
2491                               packet->buffer->len - 1);
2492
2493       SILC_LOG_INFO(("Disconnected by %s (%s): %s (%d) %s",
2494                      sock->ip, sock->hostname,
2495                      silc_get_status_message(status), status,
2496                      message ? message : ""));
2497       silc_free(message);
2498
2499       /* Handle the disconnection from our end too */
2500       if (sock->user_data && SILC_IS_LOCAL(sock->user_data))
2501         silc_server_free_sock_user_data(server, sock, NULL);
2502       silc_server_close_connection(server, sock);
2503     }
2504     break;
2505
2506   case SILC_PACKET_SUCCESS:
2507     /*
2508      * Success received for something. For now we can have only
2509      * one protocol for connection executing at once hence this
2510      * success message is for whatever protocol is executing currently.
2511      */
2512     if (packet->flags & SILC_PACKET_FLAG_LIST)
2513       break;
2514     if (sock->protocol)
2515       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2516     break;
2517
2518   case SILC_PACKET_FAILURE:
2519     /*
2520      * Failure received for something. For now we can have only
2521      * one protocol for connection executing at once hence this
2522      * failure message is for whatever protocol is executing currently.
2523      */
2524     if (packet->flags & SILC_PACKET_FLAG_LIST)
2525       break;
2526     if (sock->protocol) {
2527       SilcServerFailureContext f;
2528       f = silc_calloc(1, sizeof(*f));
2529       f->sock = silc_socket_dup(sock);
2530
2531       /* We will wait 5 seconds to process this failure packet */
2532       silc_schedule_task_add(server->schedule, sock->sock,
2533                              silc_server_failure_callback, (void *)f, 5, 0,
2534                              SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2535     }
2536     break;
2537
2538   case SILC_PACKET_REJECT:
2539     if (packet->flags & SILC_PACKET_FLAG_LIST)
2540       break;
2541     return;
2542     break;
2543
2544   case SILC_PACKET_NOTIFY:
2545     /*
2546      * Received notify packet. Server can receive notify packets from
2547      * router. Server then relays the notify messages to clients if needed.
2548      */
2549     if (packet->flags & SILC_PACKET_FLAG_LIST)
2550       silc_server_notify_list(server, sock, packet);
2551     else
2552       silc_server_notify(server, sock, packet);
2553     break;
2554
2555     /*
2556      * Channel packets
2557      */
2558   case SILC_PACKET_CHANNEL_MESSAGE:
2559     /*
2560      * Received channel message. Channel messages are special packets
2561      * (although probably most common ones) thus they are handled
2562      * specially.
2563      */
2564     if (packet->flags & SILC_PACKET_FLAG_LIST)
2565       break;
2566     idata->last_receive = time(NULL);
2567     silc_server_channel_message(server, sock, packet);
2568     break;
2569
2570   case SILC_PACKET_CHANNEL_KEY:
2571     /*
2572      * Received key for channel. As channels are created by the router
2573      * the keys are as well. We will distribute the key to all of our
2574      * locally connected clients on the particular channel. Router
2575      * never receives this channel and thus is ignored.
2576      */
2577     if (packet->flags & SILC_PACKET_FLAG_LIST)
2578       break;
2579     silc_server_channel_key(server, sock, packet);
2580     break;
2581
2582     /*
2583      * Command packets
2584      */
2585   case SILC_PACKET_COMMAND:
2586     /*
2587      * Recived command. Processes the command request and allocates the
2588      * command context and calls the command.
2589      */
2590     if (packet->flags & SILC_PACKET_FLAG_LIST)
2591       break;
2592     silc_server_command_process(server, sock, packet);
2593     break;
2594
2595   case SILC_PACKET_COMMAND_REPLY:
2596     /*
2597      * Received command reply packet. Received command reply to command. It
2598      * may be reply to command sent by us or reply to command sent by client
2599      * that we've routed further.
2600      */
2601     if (packet->flags & SILC_PACKET_FLAG_LIST)
2602       break;
2603     silc_server_command_reply(server, sock, packet);
2604     break;
2605
2606     /*
2607      * Private Message packets
2608      */
2609   case SILC_PACKET_PRIVATE_MESSAGE:
2610     /*
2611      * Received private message packet. The packet is coming from either
2612      * client or server.
2613      */
2614     if (packet->flags & SILC_PACKET_FLAG_LIST)
2615       break;
2616     idata->last_receive = time(NULL);
2617     silc_server_private_message(server, sock, packet);
2618     break;
2619
2620   case SILC_PACKET_PRIVATE_MESSAGE_KEY:
2621     /*
2622      * Private message key packet.
2623      */
2624     if (packet->flags & SILC_PACKET_FLAG_LIST)
2625       break;
2626     silc_server_private_message_key(server, sock, packet);
2627     break;
2628
2629     /*
2630      * Key Exchange protocol packets
2631      */
2632   case SILC_PACKET_KEY_EXCHANGE:
2633     if (packet->flags & SILC_PACKET_FLAG_LIST)
2634       break;
2635
2636     if (sock->protocol && sock->protocol->protocol &&
2637         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
2638       SilcServerKEInternalContext *proto_ctx =
2639         (SilcServerKEInternalContext *)sock->protocol->context;
2640
2641       proto_ctx->packet = silc_packet_context_dup(packet);
2642
2643       /* Let the protocol handle the packet */
2644       silc_protocol_execute(sock->protocol, server->schedule, 0, 100000);
2645     } else {
2646       SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
2647                       "protocol active, packet dropped."));
2648     }
2649     break;
2650
2651   case SILC_PACKET_KEY_EXCHANGE_1:
2652     if (packet->flags & SILC_PACKET_FLAG_LIST)
2653       break;
2654
2655     if (sock->protocol && sock->protocol->protocol &&
2656         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2657          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2658
2659       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2660         SilcServerRekeyInternalContext *proto_ctx =
2661           (SilcServerRekeyInternalContext *)sock->protocol->context;
2662
2663         if (proto_ctx->packet)
2664           silc_packet_context_free(proto_ctx->packet);
2665
2666         proto_ctx->packet = silc_packet_context_dup(packet);
2667
2668         /* Let the protocol handle the packet */
2669         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2670       } else {
2671         SilcServerKEInternalContext *proto_ctx =
2672           (SilcServerKEInternalContext *)sock->protocol->context;
2673
2674         if (proto_ctx->packet)
2675           silc_packet_context_free(proto_ctx->packet);
2676
2677         proto_ctx->packet = silc_packet_context_dup(packet);
2678         proto_ctx->dest_id_type = packet->src_id_type;
2679         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2680                                             packet->src_id_type);
2681         if (!proto_ctx->dest_id)
2682           break;
2683
2684         /* Let the protocol handle the packet */
2685         silc_protocol_execute(sock->protocol, server->schedule,
2686                               0, 100000);
2687       }
2688     } else {
2689       SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
2690                       "protocol active, packet dropped."));
2691     }
2692     break;
2693
2694   case SILC_PACKET_KEY_EXCHANGE_2:
2695     if (packet->flags & SILC_PACKET_FLAG_LIST)
2696       break;
2697
2698     if (sock->protocol && sock->protocol->protocol &&
2699         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2700          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2701
2702       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2703         SilcServerRekeyInternalContext *proto_ctx =
2704           (SilcServerRekeyInternalContext *)sock->protocol->context;
2705
2706         if (proto_ctx->packet)
2707           silc_packet_context_free(proto_ctx->packet);
2708
2709         proto_ctx->packet = silc_packet_context_dup(packet);
2710
2711         /* Let the protocol handle the packet */
2712         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2713       } else {
2714         SilcServerKEInternalContext *proto_ctx =
2715           (SilcServerKEInternalContext *)sock->protocol->context;
2716
2717         if (proto_ctx->packet)
2718           silc_packet_context_free(proto_ctx->packet);
2719
2720         proto_ctx->packet = silc_packet_context_dup(packet);
2721         proto_ctx->dest_id_type = packet->src_id_type;
2722         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2723                                             packet->src_id_type);
2724         if (!proto_ctx->dest_id)
2725           break;
2726
2727         /* Let the protocol handle the packet */
2728         silc_protocol_execute(sock->protocol, server->schedule,
2729                               0, 100000);
2730       }
2731     } else {
2732       SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
2733                       "protocol active, packet dropped."));
2734     }
2735     break;
2736
2737   case SILC_PACKET_CONNECTION_AUTH_REQUEST:
2738     /*
2739      * Connection authentication request packet. When we receive this packet
2740      * we will send to the other end information about our mandatory
2741      * authentication method for the connection. This packet maybe received
2742      * at any time.
2743      */
2744     if (packet->flags & SILC_PACKET_FLAG_LIST)
2745       break;
2746     silc_server_connection_auth_request(server, sock, packet);
2747     break;
2748
2749     /*
2750      * Connection Authentication protocol packets
2751      */
2752   case SILC_PACKET_CONNECTION_AUTH:
2753     /* Start of the authentication protocol. We receive here the
2754        authentication data and will verify it. */
2755     if (packet->flags & SILC_PACKET_FLAG_LIST)
2756       break;
2757
2758     if (sock->protocol && sock->protocol->protocol->type
2759         == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
2760
2761       SilcServerConnAuthInternalContext *proto_ctx =
2762         (SilcServerConnAuthInternalContext *)sock->protocol->context;
2763
2764       proto_ctx->packet = silc_packet_context_dup(packet);
2765
2766       /* Let the protocol handle the packet */
2767       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2768     } else {
2769       SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
2770                       "protocol active, packet dropped."));
2771     }
2772     break;
2773
2774   case SILC_PACKET_NEW_ID:
2775     /*
2776      * Received New ID packet. This includes some new ID that has been
2777      * created. It may be for client, server or channel. This is the way
2778      * to distribute information about new registered entities in the
2779      * SILC network.
2780      */
2781     if (packet->flags & SILC_PACKET_FLAG_LIST)
2782       silc_server_new_id_list(server, sock, packet);
2783     else
2784       silc_server_new_id(server, sock, packet);
2785     break;
2786
2787   case SILC_PACKET_NEW_CLIENT:
2788     /*
2789      * Received new client packet. This includes client information that
2790      * we will use to create initial client ID. After creating new
2791      * ID we will send it to the client.
2792      */
2793     if (packet->flags & SILC_PACKET_FLAG_LIST)
2794       break;
2795     silc_server_new_client(server, sock, packet);
2796     break;
2797
2798   case SILC_PACKET_NEW_SERVER:
2799     /*
2800      * Received new server packet. This includes Server ID and some other
2801      * information that we may save. This is received after server has
2802      * connected to us.
2803      */
2804     if (packet->flags & SILC_PACKET_FLAG_LIST)
2805       break;
2806     silc_server_new_server(server, sock, packet);
2807     break;
2808
2809   case SILC_PACKET_NEW_CHANNEL:
2810     /*
2811      * Received new channel packet. Information about new channel in the
2812      * network are distributed using this packet.
2813      */
2814     if (packet->flags & SILC_PACKET_FLAG_LIST)
2815       silc_server_new_channel_list(server, sock, packet);
2816     else
2817       silc_server_new_channel(server, sock, packet);
2818     break;
2819
2820   case SILC_PACKET_HEARTBEAT:
2821     /*
2822      * Received heartbeat.
2823      */
2824     if (packet->flags & SILC_PACKET_FLAG_LIST)
2825       break;
2826     break;
2827
2828   case SILC_PACKET_KEY_AGREEMENT:
2829     /*
2830      * Received heartbeat.
2831      */
2832     if (packet->flags & SILC_PACKET_FLAG_LIST)
2833       break;
2834     silc_server_key_agreement(server, sock, packet);
2835     break;
2836
2837   case SILC_PACKET_REKEY:
2838     /*
2839      * Received re-key packet. The sender wants to regenerate the session
2840      * keys.
2841      */
2842     if (packet->flags & SILC_PACKET_FLAG_LIST)
2843       break;
2844     silc_server_rekey(server, sock, packet);
2845     break;
2846
2847   case SILC_PACKET_REKEY_DONE:
2848     /*
2849      * The re-key is done.
2850      */
2851     if (packet->flags & SILC_PACKET_FLAG_LIST)
2852       break;
2853
2854     if (sock->protocol && sock->protocol->protocol &&
2855         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2856
2857       SilcServerRekeyInternalContext *proto_ctx =
2858         (SilcServerRekeyInternalContext *)sock->protocol->context;
2859
2860       if (proto_ctx->packet)
2861         silc_packet_context_free(proto_ctx->packet);
2862
2863       proto_ctx->packet = silc_packet_context_dup(packet);
2864
2865       /* Let the protocol handle the packet */
2866       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2867     } else {
2868       SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2869                       "protocol active, packet dropped."));
2870     }
2871     break;
2872
2873   case SILC_PACKET_FTP:
2874     /* FTP packet */
2875     if (packet->flags & SILC_PACKET_FLAG_LIST)
2876       break;
2877     silc_server_ftp(server, sock, packet);
2878     break;
2879
2880   case SILC_PACKET_RESUME_CLIENT:
2881     /* Resume client */
2882     if (packet->flags & SILC_PACKET_FLAG_LIST)
2883       break;
2884     silc_server_resume_client(server, sock, packet);
2885     break;
2886
2887   case SILC_PACKET_RESUME_ROUTER:
2888     /* Resume router packet received. This packet is received for backup
2889        router resuming protocol. */
2890     if (packet->flags & SILC_PACKET_FLAG_LIST)
2891       break;
2892     silc_server_backup_resume_router(server, sock, packet);
2893     break;
2894
2895   default:
2896     SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2897     break;
2898   }
2899 }
2900
2901 /* Creates connection to a remote router. */
2902
2903 void silc_server_create_connection(SilcServer server,
2904                                    const char *remote_host, SilcUInt32 port)
2905 {
2906   SilcServerConnection sconn;
2907
2908   /* Allocate connection object for hold connection specific stuff. */
2909   sconn = silc_calloc(1, sizeof(*sconn));
2910   sconn->remote_host = strdup(remote_host);
2911   sconn->remote_port = port;
2912   sconn->no_reconnect = TRUE;
2913
2914   silc_schedule_task_add(server->schedule, 0,
2915                          silc_server_connect_router,
2916                          (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2917                          SILC_TASK_PRI_NORMAL);
2918 }
2919
2920 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2921 {
2922   silc_socket_free(context);
2923 }
2924
2925 /* Closes connection to socket connection */
2926
2927 void silc_server_close_connection(SilcServer server,
2928                                   SilcSocketConnection sock)
2929 {
2930   char tmp[128];
2931
2932   if (!server->sockets[sock->sock] && SILC_IS_DISCONNECTED(sock)) {
2933     silc_schedule_task_add(server->schedule, 0,
2934                            silc_server_close_connection_final,
2935                            (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2936                            SILC_TASK_PRI_NORMAL);
2937     return;
2938   }
2939
2940   memset(tmp, 0, sizeof(tmp));
2941   silc_socket_get_error(sock, tmp, sizeof(tmp));
2942   SILC_LOG_INFO(("Closing connection %s:%d [%s] %s", sock->hostname,
2943                   sock->port,
2944                   (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2945                    sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2946                    sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2947                    "Router"), tmp[0] ? tmp : ""));
2948
2949   /* We won't listen for this connection anymore */
2950   silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2951
2952   /* Unregister all tasks */
2953   silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2954
2955   /* Close the actual connection */
2956   silc_net_close_connection(sock->sock);
2957   server->sockets[sock->sock] = NULL;
2958
2959   /* If sock->user_data is NULL then we'll check for active protocols
2960      here since the silc_server_free_sock_user_data has not been called
2961      for this connection. */
2962   if (!sock->user_data) {
2963     /* If any protocol is active cancel its execution. It will call
2964        the final callback which will finalize the disconnection. */
2965     if (sock->protocol) {
2966       SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
2967       silc_protocol_cancel(sock->protocol, server->schedule);
2968       sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2969       silc_protocol_execute_final(sock->protocol, server->schedule);
2970       sock->protocol = NULL;
2971       return;
2972     }
2973   }
2974
2975   silc_schedule_task_add(server->schedule, 0,
2976                          silc_server_close_connection_final,
2977                          (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2978                          SILC_TASK_PRI_NORMAL);
2979 }
2980
2981 /* Sends disconnect message to remote connection and disconnects the
2982    connection. */
2983
2984 void silc_server_disconnect_remote(SilcServer server,
2985                                    SilcSocketConnection sock,
2986                                    SilcStatus status, ...)
2987 {
2988   va_list ap;
2989   unsigned char buf[512];
2990   SilcBuffer buffer;
2991   char *cp;
2992   int len;
2993
2994   if (!sock || SILC_IS_DISCONNECTED(sock))
2995     return;
2996
2997   memset(buf, 0, sizeof(buf));
2998   va_start(ap, status);
2999   cp = va_arg(ap, char *);
3000   if (cp) {
3001     vsnprintf(buf, sizeof(buf) - 1, cp, ap);
3002     cp = buf;
3003   }
3004   va_end(ap);
3005
3006   SILC_LOG_DEBUG(("Disconnecting remote host"));
3007
3008   /* Notify remote end that the conversation is over. The notify message
3009      is tried to be sent immediately. */
3010
3011   len = 1;
3012   if (cp)
3013     len += silc_utf8_encoded_len(buf, strlen(buf), SILC_STRING_ASCII);
3014
3015   buffer = silc_buffer_alloc_size(len);
3016   if (!buffer)
3017     goto out;
3018
3019   buffer->data[0] = status;
3020   if (cp)
3021     silc_utf8_encode(buf, strlen(buf), SILC_STRING_ASCII, buffer->data + 1,
3022                      buffer->len - 1);
3023   silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
3024                           buffer->data, buffer->len, TRUE);
3025   silc_buffer_free(buffer);
3026
3027  out:
3028   silc_server_packet_queue_purge(server, sock);
3029
3030   /* Mark the connection to be disconnected */
3031   SILC_SET_DISCONNECTED(sock);
3032   silc_server_close_connection(server, sock);
3033 }
3034
3035 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
3036 {
3037   SilcServer server = app_context;
3038   SilcClientEntry client = context;
3039
3040   assert(!silc_hash_table_count(client->channels));
3041
3042   silc_idlist_del_data(client);
3043   silc_idcache_purge_by_context(server->local_list->clients, client);
3044 }
3045
3046 /* Frees client data and notifies about client's signoff. */
3047
3048 void silc_server_free_client_data(SilcServer server,
3049                                   SilcSocketConnection sock,
3050                                   SilcClientEntry client,
3051                                   int notify,
3052                                   const char *signoff)
3053 {
3054   SILC_LOG_DEBUG(("Freeing client data"));
3055
3056   /* If there is pending outgoing data for the client then purge it
3057      to the network before removing the client entry. */
3058   silc_server_packet_queue_purge(server, sock);
3059
3060   if (client->id) {
3061     /* Check if anyone is watching this nickname */
3062     if (server->server_type == SILC_ROUTER)
3063       silc_server_check_watcher_list(server, client, NULL,
3064                                      SILC_NOTIFY_TYPE_SIGNOFF);
3065
3066     /* Send SIGNOFF notify to routers. */
3067     if (notify)
3068       silc_server_send_notify_signoff(server, SILC_PRIMARY_ROUTE(server),
3069                                       SILC_BROADCAST(server), client->id,
3070                                       signoff);
3071   }
3072
3073   /* Remove client from all channels */
3074   if (notify)
3075     silc_server_remove_from_channels(server, NULL, client,
3076                                      TRUE, (char *)signoff, TRUE);
3077   else
3078     silc_server_remove_from_channels(server, NULL, client,
3079                                      FALSE, NULL, FALSE);
3080
3081   /* Remove this client from watcher list if it is */
3082   silc_server_del_from_watcher_list(server, client);
3083
3084   /* Update statistics */
3085   server->stat.my_clients--;
3086   server->stat.clients--;
3087   if (server->stat.cell_clients)
3088     server->stat.cell_clients--;
3089   SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
3090   SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
3091   silc_schedule_task_del_by_context(server->schedule, client);
3092
3093   /* We will not delete the client entry right away. We will take it
3094      into history (for WHOWAS command) for 5 minutes, unless we're
3095      shutting down server. */
3096   if (!server->server_shutdown) {
3097     silc_schedule_task_add(server->schedule, 0,
3098                            silc_server_free_client_data_timeout,
3099                            client, 300, 0,
3100                            SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
3101     client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
3102     client->data.status &= ~SILC_IDLIST_STATUS_LOCAL;
3103     client->mode = 0;
3104     client->router = NULL;
3105     client->connection = NULL;
3106   } else {
3107     /* Delete directly since we're shutting down server */
3108     silc_idlist_del_data(client);
3109     silc_idlist_del_client(server->local_list, client);
3110   }
3111 }
3112
3113 /* Frees user_data pointer from socket connection object. This also sends
3114    appropriate notify packets to the network to inform about leaving
3115    entities. */
3116
3117 void silc_server_free_sock_user_data(SilcServer server,
3118                                      SilcSocketConnection sock,
3119                                      const char *signoff_message)
3120 {
3121   switch (sock->type) {
3122   case SILC_SOCKET_TYPE_CLIENT:
3123     {
3124       SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
3125       silc_server_free_client_data(server, sock, user_data, TRUE,
3126                                    signoff_message);
3127       break;
3128     }
3129   case SILC_SOCKET_TYPE_SERVER:
3130   case SILC_SOCKET_TYPE_ROUTER:
3131     {
3132       SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
3133       SilcServerEntry backup_router = NULL;
3134
3135       SILC_LOG_DEBUG(("Freeing server data"));
3136
3137       if (user_data->id)
3138         backup_router = silc_server_backup_get(server, user_data->id);
3139
3140       if (!server->backup_router && server->server_type == SILC_ROUTER &&
3141           backup_router == server->id_entry &&
3142           sock->type != SILC_SOCKET_TYPE_ROUTER)
3143         backup_router = NULL;
3144
3145       if (server->server_shutdown || server->backup_noswitch)
3146         backup_router = NULL;
3147
3148       /* If this was our primary router connection then we're lost to
3149          the outside world. */
3150       if (server->router == user_data) {
3151         /* Check whether we have a backup router connection */
3152         if (!backup_router || backup_router == user_data) {
3153           silc_schedule_task_add(server->schedule, 0,
3154                                  silc_server_connect_to_router,
3155                                  server, 1, 0,
3156                                  SILC_TASK_TIMEOUT,
3157                                  SILC_TASK_PRI_NORMAL);
3158
3159           server->id_entry->router = NULL;
3160           server->router = NULL;
3161           server->standalone = TRUE;
3162           backup_router = NULL;
3163         } else {
3164           if (server->id_entry != backup_router) {
3165             SILC_LOG_INFO(("New primary router is backup router %s",
3166                            backup_router->server_name));
3167             server->id_entry->router = backup_router;
3168             server->router = backup_router;
3169             server->router_connect = time(0);
3170             server->backup_primary = TRUE;
3171           } else {
3172             SILC_LOG_INFO(("We are now new primary router in this cell"));
3173             server->id_entry->router = NULL;
3174             server->router = NULL;
3175             server->standalone = TRUE;
3176
3177             /* We stop here to take a breath */
3178             sleep(2);
3179           }
3180
3181           if (server->server_type == SILC_BACKUP_ROUTER) {
3182             server->server_type = SILC_ROUTER;
3183
3184             /* We'll need to constantly try to reconnect to the primary
3185                router so that we'll see when it comes back online. */
3186             silc_server_backup_reconnect(server, sock->ip, sock->port,
3187                                          silc_server_backup_connected,
3188                                          NULL);
3189           }
3190
3191           /* Mark this connection as replaced */
3192           silc_server_backup_replaced_add(server, user_data->id,
3193                                           backup_router);
3194         }
3195       } else if (backup_router) {
3196         SILC_LOG_INFO(("Enabling the use of backup router %s",
3197                        backup_router->server_name));
3198         SILC_LOG_DEBUG(("Enabling the use of backup router %s",
3199                         backup_router->server_name));
3200
3201         /* Mark this connection as replaced */
3202         silc_server_backup_replaced_add(server, user_data->id,
3203                                         backup_router);
3204       } else if (server->server_type == SILC_SERVER &&
3205                  sock->type == SILC_SOCKET_TYPE_ROUTER) {
3206         /* Reconnect to the router (backup) */
3207         silc_schedule_task_add(server->schedule, 0,
3208                                silc_server_connect_to_router,
3209                                server, 1, 0,
3210                                SILC_TASK_TIMEOUT,
3211                                SILC_TASK_PRI_NORMAL);
3212       }
3213
3214       if (!backup_router) {
3215         /* Remove all servers that are originated from this server, and
3216            remove the clients of those servers too. */
3217         silc_server_remove_servers_by_server(server, user_data, TRUE);
3218
3219         /* Remove the clients that this server owns as they will become
3220            invalid now too.  For backup router the server is actually
3221            coming from the primary router, so mark that as the owner
3222            of this entry. */
3223         if (server->server_type == SILC_BACKUP_ROUTER &&
3224             sock->type == SILC_SOCKET_TYPE_SERVER)
3225           silc_server_remove_clients_by_server(server, server->router,
3226                                                user_data, TRUE);
3227         else
3228           silc_server_remove_clients_by_server(server, user_data,
3229                                                user_data, TRUE);
3230
3231         /* Remove channels owned by this server */
3232         if (server->server_type == SILC_SERVER)
3233           silc_server_remove_channels_by_server(server, user_data);
3234       } else {
3235         /* Enable local server connections that may be disabled */
3236         silc_server_local_servers_toggle_enabled(server, TRUE);
3237
3238         /* Update the client entries of this server to the new backup
3239            router.  If we are the backup router we also resolve the real
3240            servers for the clients.  After updating is over this also
3241            removes the clients that this server explicitly owns. */
3242         silc_server_update_clients_by_server(server, user_data,
3243                                              backup_router, TRUE);
3244
3245         /* If we are router and just lost our primary router (now standlaone)
3246            we remove everything that was behind it, since we don't know
3247            any better. */
3248         if (server->server_type == SILC_ROUTER && server->standalone)
3249           /* Remove all servers that are originated from this server, and
3250              remove the clients of those servers too. */
3251           silc_server_remove_servers_by_server(server, user_data, TRUE);
3252
3253         /* Finally remove the clients that are explicitly owned by this
3254            server.  They go down with the server. */
3255         silc_server_remove_clients_by_server(server, user_data,
3256                                              user_data, TRUE);
3257
3258         /* Update our server cache to use the new backup router too. */
3259         silc_server_update_servers_by_server(server, user_data, backup_router);
3260         if (server->server_type == SILC_SERVER)
3261           silc_server_update_channels_by_server(server, user_data,
3262                                                 backup_router);
3263
3264         /* Send notify about primary router going down to local operators */
3265         if (server->backup_router)
3266           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3267                                  SILC_NOTIFY_TYPE_NONE,
3268                                  ("%s switched to backup router %s "
3269                                   "(we are primary router now)",
3270                                   server->server_name, server->server_name));
3271         else if (server->router)
3272           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3273                                  SILC_NOTIFY_TYPE_NONE,
3274                                  ("%s switched to backup router %s",
3275                                   server->server_name,
3276                                   server->router->server_name));
3277       }
3278       server->backup_noswitch = FALSE;
3279
3280       /* Free the server entry */
3281       silc_server_backup_del(server, user_data);
3282       silc_server_backup_replaced_del(server, user_data);
3283       silc_idlist_del_data(user_data);
3284       if (!silc_idlist_del_server(server->local_list, user_data))
3285         silc_idlist_del_server(server->global_list, user_data);
3286       if (sock->type == SILC_SOCKET_TYPE_SERVER) {
3287         server->stat.my_servers--;
3288       } else {
3289         server->stat.my_routers--;
3290         server->stat.routers--;
3291       }
3292       server->stat.servers--;
3293       if (server->server_type == SILC_ROUTER)
3294         server->stat.cell_servers--;
3295
3296       if (backup_router && backup_router != server->id_entry) {
3297         /* Announce all of our stuff that was created about 5 minutes ago.
3298            The backup router knows all the other stuff already. */
3299         if (server->server_type == SILC_ROUTER)
3300           silc_server_announce_servers(server, FALSE, time(0) - 300,
3301                                        backup_router->connection);
3302
3303         /* Announce our clients and channels to the router */
3304         silc_server_announce_clients(server, time(0) - 300,
3305                                      backup_router->connection);
3306         silc_server_announce_channels(server, time(0) - 300,
3307                                       backup_router->connection);
3308       }
3309       break;
3310     }
3311   default:
3312     {
3313       SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
3314
3315       SILC_LOG_DEBUG(("Freeing unknown connection data"));
3316
3317       silc_idlist_del_data(user_data);
3318       silc_free(user_data);
3319       break;
3320     }
3321   }
3322
3323   /* If any protocol is active cancel its execution */
3324   if (sock->protocol) {
3325     SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
3326     silc_protocol_cancel(sock->protocol, server->schedule);
3327     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3328     silc_protocol_execute_final(sock->protocol, server->schedule);
3329     sock->protocol = NULL;
3330   }
3331
3332   sock->user_data = NULL;
3333 }
3334
3335 /* Removes client from all channels it has joined. This is used when client
3336    connection is disconnected. If the client on a channel is last, the
3337    channel is removed as well. This sends the SIGNOFF notify types. */
3338
3339 void silc_server_remove_from_channels(SilcServer server,
3340                                       SilcSocketConnection sock,
3341                                       SilcClientEntry client,
3342                                       bool notify,
3343                                       const char *signoff_message,
3344                                       bool keygen)
3345 {
3346   SilcChannelEntry channel;
3347   SilcChannelClientEntry chl;
3348   SilcHashTableList htl;
3349   SilcBuffer clidp = NULL;
3350
3351   if (!client)
3352     return;
3353
3354   SILC_LOG_DEBUG(("Removing client from joined channels"));
3355
3356   if (notify && !client->id)
3357     notify = FALSE;
3358
3359   if (notify) {
3360     clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3361     if (!clidp)
3362       notify = FALSE;
3363   }
3364
3365   /* Remove the client from all channels. The client is removed from
3366      the channels' user list. */
3367   silc_hash_table_list(client->channels, &htl);
3368   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3369     channel = chl->channel;
3370
3371     /* Remove channel if this is last client leaving the channel, unless
3372        the channel is permanent. */
3373     if (server->server_type != SILC_SERVER &&
3374         silc_hash_table_count(channel->user_list) < 2) {
3375       silc_server_channel_delete(server, channel);
3376       continue;
3377     }
3378
3379     silc_hash_table_del(client->channels, channel);
3380     silc_hash_table_del(channel->user_list, client);
3381     channel->user_count--;
3382
3383     /* If there is no global users on the channel anymore mark the channel
3384        as local channel. Do not check if the removed client is local client. */
3385     if (server->server_type == SILC_SERVER && channel->global_users &&
3386         chl->client->router && !silc_server_channel_has_global(channel))
3387       channel->global_users = FALSE;
3388
3389     memset(chl, 'A', sizeof(*chl));
3390     silc_free(chl);
3391
3392     /* Update statistics */
3393     if (SILC_IS_LOCAL(client))
3394       server->stat.my_chanclients--;
3395     if (server->server_type == SILC_ROUTER) {
3396       server->stat.cell_chanclients--;
3397       server->stat.chanclients--;
3398     }
3399
3400     /* If there is not at least one local user on the channel then we don't
3401        need the channel entry anymore, we can remove it safely, unless the
3402        channel is permanent channel */
3403     if (server->server_type == SILC_SERVER &&
3404         !silc_server_channel_has_local(channel)) {
3405       /* Notify about leaving client if this channel has global users. */
3406       if (notify && channel->global_users)
3407         silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3408                                            SILC_NOTIFY_TYPE_SIGNOFF,
3409                                            signoff_message ? 2 : 1,
3410                                            clidp->data, clidp->len,
3411                                            signoff_message, signoff_message ?
3412                                            strlen(signoff_message) : 0);
3413
3414       silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3415       silc_server_channel_delete(server, channel);
3416       continue;
3417     }
3418
3419     /* Send notify to channel about client leaving SILC and channel too */
3420     if (notify)
3421       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3422                                          SILC_NOTIFY_TYPE_SIGNOFF,
3423                                          signoff_message ? 2 : 1,
3424                                          clidp->data, clidp->len,
3425                                          signoff_message, signoff_message ?
3426                                          strlen(signoff_message) : 0);
3427
3428     /* Don't create keys if we are shutting down */
3429     if (server->server_shutdown)
3430       continue;
3431
3432     /* Re-generate channel key if needed */
3433     if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
3434       if (!silc_server_create_channel_key(server, channel, 0))
3435         continue;
3436
3437       /* Send the channel key to the channel. The key of course is not sent
3438          to the client who was removed from the channel. */
3439       silc_server_send_channel_key(server, client->connection, channel,
3440                                    server->server_type == SILC_ROUTER ?
3441                                    FALSE : !server->standalone);
3442     }
3443   }
3444
3445   silc_hash_table_list_reset(&htl);
3446   if (clidp)
3447     silc_buffer_free(clidp);
3448 }
3449
3450 /* Removes client from one channel. This is used for example when client
3451    calls LEAVE command to remove itself from the channel. Returns TRUE
3452    if channel still exists and FALSE if the channel is removed when
3453    last client leaves the channel. If `notify' is FALSE notify messages
3454    are not sent. */
3455
3456 bool silc_server_remove_from_one_channel(SilcServer server,
3457                                          SilcSocketConnection sock,
3458                                          SilcChannelEntry channel,
3459                                          SilcClientEntry client,
3460                                          bool notify)
3461 {
3462   SilcChannelClientEntry chl;
3463   SilcBuffer clidp;
3464
3465   SILC_LOG_DEBUG(("Removing %s from channel %s",
3466                   silc_id_render(client->id, SILC_ID_CLIENT),
3467                   channel->channel_name));
3468
3469   /* Get the entry to the channel, if this client is not on the channel
3470      then return Ok. */
3471   if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
3472     return TRUE;
3473
3474   /* Remove channel if this is last client leaving the channel, unless
3475      the channel is permanent. */
3476   if (server->server_type != SILC_SERVER &&
3477       silc_hash_table_count(channel->user_list) < 2) {
3478     silc_server_channel_delete(server, channel);
3479     return FALSE;
3480   }
3481
3482   silc_hash_table_del(client->channels, channel);
3483   silc_hash_table_del(channel->user_list, client);
3484   channel->user_count--;
3485
3486   /* If there is no global users on the channel anymore mark the channel
3487      as local channel. Do not check if the client is local client. */
3488   if (server->server_type == SILC_SERVER && channel->global_users &&
3489       chl->client->router && !silc_server_channel_has_global(channel))
3490     channel->global_users = FALSE;
3491
3492   memset(chl, 'O', sizeof(*chl));
3493   silc_free(chl);
3494
3495   /* Update statistics */
3496   if (SILC_IS_LOCAL(client))
3497     server->stat.my_chanclients--;
3498   if (server->server_type == SILC_ROUTER) {
3499     server->stat.cell_chanclients--;
3500     server->stat.chanclients--;
3501   }
3502
3503   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3504   if (!clidp)
3505     notify = FALSE;
3506
3507   /* If there is not at least one local user on the channel then we don't
3508      need the channel entry anymore, we can remove it safely, unless the
3509      channel is permanent channel */
3510   if (server->server_type == SILC_SERVER &&
3511       !silc_server_channel_has_local(channel)) {
3512     /* Notify about leaving client if this channel has global users. */
3513     if (notify && channel->global_users)
3514       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3515                                          SILC_NOTIFY_TYPE_LEAVE, 1,
3516                                          clidp->data, clidp->len);
3517
3518     silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3519     silc_server_channel_delete(server, channel);
3520     silc_buffer_free(clidp);
3521     return FALSE;
3522   }
3523
3524   /* Send notify to channel about client leaving the channel */
3525   if (notify)
3526     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3527                                        SILC_NOTIFY_TYPE_LEAVE, 1,
3528                                        clidp->data, clidp->len);
3529
3530   silc_buffer_free(clidp);
3531   return TRUE;
3532 }
3533
3534 /* Timeout callback. This is called if connection is idle or for some
3535    other reason is not responding within some period of time. This
3536    disconnects the remote end. */
3537
3538 SILC_TASK_CALLBACK(silc_server_timeout_remote)
3539 {
3540   SilcServer server = (SilcServer)context;
3541   SilcSocketConnection sock = server->sockets[fd];
3542   SilcProtocolType protocol = 0;
3543
3544   SILC_LOG_DEBUG(("Start"));
3545
3546   if (!sock)
3547     return;
3548
3549   SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
3550                   sock->hostname, sock->ip));
3551
3552   /* If we have protocol active we must assure that we call the protocol's
3553      final callback so that all the memory is freed. */
3554   if (sock->protocol) {
3555     protocol = sock->protocol->protocol->type;
3556     silc_protocol_cancel(sock->protocol, server->schedule);
3557     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3558     silc_protocol_execute_final(sock->protocol, server->schedule);
3559     sock->protocol = NULL;
3560     return;
3561   }
3562
3563   silc_server_disconnect_remote(server, sock,
3564                                 protocol ==
3565                                 SILC_PROTOCOL_SERVER_CONNECTION_AUTH ?
3566                                 SILC_STATUS_ERR_AUTH_FAILED :
3567                                 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
3568                                 "Connection timeout");
3569
3570   if (sock->user_data)
3571     silc_server_free_sock_user_data(server, sock, NULL);
3572 }
3573
3574 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
3575    function may be used only by router. In real SILC network all channels
3576    are created by routers thus this function is never used by normal
3577    server. */
3578
3579 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
3580                                                 SilcServerID *router_id,
3581                                                 char *cipher,
3582                                                 char *hmac,
3583                                                 char *channel_name,
3584                                                 int broadcast)
3585 {
3586   SilcChannelID *channel_id;
3587   SilcChannelEntry entry;
3588   SilcCipher key;
3589   SilcHmac newhmac;
3590
3591   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3592
3593   if (!cipher)
3594     cipher = SILC_DEFAULT_CIPHER;
3595   if (!hmac)
3596     hmac = SILC_DEFAULT_HMAC;
3597
3598   /* Allocate cipher */
3599   if (!silc_cipher_alloc(cipher, &key))
3600     return NULL;
3601
3602   /* Allocate hmac */
3603   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3604     silc_cipher_free(key);
3605     return NULL;
3606   }
3607
3608   channel_name = strdup(channel_name);
3609
3610   /* Create the channel ID */
3611   if (!silc_id_create_channel_id(server, router_id, server->rng,
3612                                  &channel_id)) {
3613     silc_free(channel_name);
3614     silc_cipher_free(key);
3615     silc_hmac_free(newhmac);
3616     return NULL;
3617   }
3618
3619   /* Create the channel */
3620   entry = silc_idlist_add_channel(server->local_list, channel_name,
3621                                   SILC_CHANNEL_MODE_NONE, channel_id,
3622                                   NULL, key, newhmac, 0);
3623   if (!entry) {
3624     silc_free(channel_name);
3625     silc_cipher_free(key);
3626     silc_hmac_free(newhmac);
3627     silc_free(channel_id);
3628     return NULL;
3629   }
3630
3631   entry->cipher = strdup(cipher);
3632   entry->hmac_name = strdup(hmac);
3633
3634   /* Now create the actual key material */
3635   if (!silc_server_create_channel_key(server, entry,
3636                                       silc_cipher_get_key_len(key) / 8)) {
3637     silc_idlist_del_channel(server->local_list, entry);
3638     return NULL;
3639   }
3640
3641   /* Notify other routers about the new channel. We send the packet
3642      to our primary route. */
3643   if (broadcast)
3644     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3645                                  channel_name, entry->id,
3646                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3647                                  entry->mode);
3648
3649   /* Distribute to backup routers */
3650   if (broadcast && server->server_type == SILC_ROUTER) {
3651     SilcBuffer packet;
3652     unsigned char *cid;
3653     SilcUInt32 name_len = strlen(channel_name);
3654     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3655     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3656
3657     packet = silc_channel_payload_encode(channel_name, name_len,
3658                                          cid, channel_id_len, entry->mode);
3659     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3660                             packet->data, packet->len, FALSE, TRUE);
3661     silc_free(cid);
3662     silc_buffer_free(packet);
3663   }
3664
3665   server->stat.my_channels++;
3666   if (server->server_type == SILC_ROUTER) {
3667     server->stat.channels++;
3668     server->stat.cell_channels++;
3669     entry->users_resolved = TRUE;
3670   }
3671
3672   return entry;
3673 }
3674
3675 /* Same as above but creates the channel with Channel ID `channel_id. */
3676
3677 SilcChannelEntry
3678 silc_server_create_new_channel_with_id(SilcServer server,
3679                                        char *cipher,
3680                                        char *hmac,
3681                                        char *channel_name,
3682                                        SilcChannelID *channel_id,
3683                                        int broadcast)
3684 {
3685   SilcChannelEntry entry;
3686   SilcCipher key;
3687   SilcHmac newhmac;
3688
3689   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3690
3691   if (!cipher)
3692     cipher = SILC_DEFAULT_CIPHER;
3693   if (!hmac)
3694     hmac = SILC_DEFAULT_HMAC;
3695
3696   /* Allocate cipher */
3697   if (!silc_cipher_alloc(cipher, &key))
3698     return NULL;
3699
3700   /* Allocate hmac */
3701   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3702     silc_cipher_free(key);
3703     return NULL;
3704   }
3705
3706   channel_name = strdup(channel_name);
3707
3708   /* Create the channel */
3709   entry = silc_idlist_add_channel(server->local_list, channel_name,
3710                                   SILC_CHANNEL_MODE_NONE, channel_id,
3711                                   NULL, key, newhmac, 0);
3712   if (!entry) {
3713     silc_cipher_free(key);
3714     silc_hmac_free(newhmac);
3715     silc_free(channel_name);
3716     return NULL;
3717   }
3718
3719   /* Now create the actual key material */
3720   if (!silc_server_create_channel_key(server, entry,
3721                                       silc_cipher_get_key_len(key) / 8)) {
3722     silc_idlist_del_channel(server->local_list, entry);
3723     return NULL;
3724   }
3725
3726   /* Notify other routers about the new channel. We send the packet
3727      to our primary route. */
3728   if (broadcast)
3729     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3730                                  channel_name, entry->id,
3731                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3732                                  entry->mode);
3733
3734   /* Distribute to backup routers */
3735   if (broadcast && server->server_type == SILC_ROUTER) {
3736     SilcBuffer packet;
3737     unsigned char *cid;
3738     SilcUInt32 name_len = strlen(channel_name);
3739     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3740     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3741
3742     packet = silc_channel_payload_encode(channel_name, name_len,
3743                                          cid, channel_id_len, entry->mode);
3744     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3745                             packet->data, packet->len, FALSE, TRUE);
3746     silc_free(cid);
3747     silc_buffer_free(packet);
3748   }
3749
3750   server->stat.my_channels++;
3751   if (server->server_type == SILC_ROUTER) {
3752     server->stat.channels++;
3753     server->stat.cell_channels++;
3754     entry->users_resolved = TRUE;
3755   }
3756
3757   return entry;
3758 }
3759
3760 /* Channel's key re-key timeout callback. */
3761
3762 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3763 {
3764   SilcServer server = app_context;
3765   SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3766
3767   rekey->task = NULL;
3768
3769   /* Return now if we are shutting down */
3770   if (server->server_shutdown)
3771     return;
3772
3773   if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3774     return;
3775
3776   silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3777 }
3778
3779 /* Generates new channel key. This is used to create the initial channel key
3780    but also to re-generate new key for channel. If `key_len' is provided
3781    it is the bytes of the key length. */
3782
3783 bool silc_server_create_channel_key(SilcServer server,
3784                                     SilcChannelEntry channel,
3785                                     SilcUInt32 key_len)
3786 {
3787   int i;
3788   unsigned char channel_key[32], hash[32];
3789   SilcUInt32 len;
3790
3791   if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3792     SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3793     return TRUE;
3794   }
3795
3796   SILC_LOG_DEBUG(("Generating channel %s key", channel->channel_name));
3797
3798   if (!channel->channel_key)
3799     if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3800       channel->channel_key = NULL;
3801       return FALSE;
3802     }
3803
3804   if (key_len)
3805     len = key_len;
3806   else if (channel->key_len)
3807     len = channel->key_len / 8;
3808   else
3809     len = silc_cipher_get_key_len(channel->channel_key) / 8;
3810
3811   /* Create channel key */
3812   for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3813
3814   /* Set the key */
3815   silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3816
3817   /* Remove old key if exists */
3818   if (channel->key) {
3819     memset(channel->key, 0, channel->key_len / 8);
3820     silc_free(channel->key);
3821   }
3822
3823   /* Save the key */
3824   channel->key_len = len * 8;
3825   channel->key = silc_memdup(channel_key, len);
3826   memset(channel_key, 0, sizeof(channel_key));
3827
3828   /* Generate HMAC key from the channel key data and set it */
3829   if (!channel->hmac)
3830     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3831   silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3832   silc_hmac_set_key(channel->hmac, hash,
3833                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3834   memset(hash, 0, sizeof(hash));
3835
3836   if (server->server_type == SILC_ROUTER) {
3837     if (!channel->rekey)
3838       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3839     channel->rekey->channel = channel;
3840     channel->rekey->key_len = key_len;
3841     if (channel->rekey->task)
3842       silc_schedule_task_del(server->schedule, channel->rekey->task);
3843
3844     channel->rekey->task =
3845       silc_schedule_task_add(server->schedule, 0,
3846                              silc_server_channel_key_rekey,
3847                              (void *)channel->rekey,
3848                              server->config->channel_rekey_secs, 0,
3849                              SILC_TASK_TIMEOUT,
3850                              SILC_TASK_PRI_NORMAL);
3851   }
3852
3853   return TRUE;
3854 }
3855
3856 /* Saves the channel key found in the encoded `key_payload' buffer. This
3857    function is used when we receive Channel Key Payload and also when we're
3858    processing JOIN command reply. Returns entry to the channel. */
3859
3860 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3861                                               SilcBuffer key_payload,
3862                                               SilcChannelEntry channel)
3863 {
3864   SilcChannelKeyPayload payload = NULL;
3865   SilcChannelID *id = NULL;
3866   unsigned char *tmp, hash[32];
3867   SilcUInt32 tmp_len;
3868   char *cipher;
3869
3870   /* Decode channel key payload */
3871   payload = silc_channel_key_payload_parse(key_payload->data,
3872                                            key_payload->len);
3873   if (!payload) {
3874     SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3875     channel = NULL;
3876     goto out;
3877   }
3878
3879   /* Get the channel entry */
3880   if (!channel) {
3881
3882     /* Get channel ID */
3883     tmp = silc_channel_key_get_id(payload, &tmp_len);
3884     id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3885     if (!id) {
3886       channel = NULL;
3887       goto out;
3888     }
3889
3890     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3891     if (!channel) {
3892       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3893       if (!channel) {
3894         if (server->server_type == SILC_ROUTER)
3895           SILC_LOG_ERROR(("Received key for non-existent channel %s",
3896                           silc_id_render(id, SILC_ID_CHANNEL)));
3897         goto out;
3898       }
3899     }
3900   }
3901
3902   SILC_LOG_DEBUG(("Saving new channel %s key", channel->channel_name));
3903
3904   tmp = silc_channel_key_get_key(payload, &tmp_len);
3905   if (!tmp) {
3906     channel = NULL;
3907     goto out;
3908   }
3909
3910   cipher = silc_channel_key_get_cipher(payload, NULL);
3911   if (!cipher) {
3912     channel = NULL;
3913     goto out;
3914   }
3915
3916   /* Remove old key if exists */
3917   if (channel->key) {
3918     memset(channel->key, 0, channel->key_len / 8);
3919     silc_free(channel->key);
3920     silc_cipher_free(channel->channel_key);
3921   }
3922
3923   /* Create new cipher */
3924   if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3925     channel->channel_key = NULL;
3926     channel = NULL;
3927     goto out;
3928   }
3929
3930   if (channel->cipher)
3931     silc_free(channel->cipher);
3932   channel->cipher = strdup(cipher);
3933
3934   /* Save the key */
3935   channel->key_len = tmp_len * 8;
3936   channel->key = silc_memdup(tmp, tmp_len);
3937   silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3938
3939   /* Generate HMAC key from the channel key data and set it */
3940   if (!channel->hmac)
3941     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3942   silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3943   silc_hmac_set_key(channel->hmac, hash,
3944                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3945
3946   memset(hash, 0, sizeof(hash));
3947   memset(tmp, 0, tmp_len);
3948
3949   if (server->server_type == SILC_ROUTER) {
3950     if (!channel->rekey)
3951       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3952     channel->rekey->channel = channel;
3953     if (channel->rekey->task)
3954       silc_schedule_task_del(server->schedule, channel->rekey->task);
3955
3956     channel->rekey->task =
3957       silc_schedule_task_add(server->schedule, 0,
3958                              silc_server_channel_key_rekey,
3959                              (void *)channel->rekey,
3960                              server->config->channel_rekey_secs, 0,
3961                              SILC_TASK_TIMEOUT,
3962                              SILC_TASK_PRI_NORMAL);
3963   }
3964
3965  out:
3966   silc_free(id);
3967   if (payload)
3968     silc_channel_key_payload_free(payload);
3969
3970   return channel;
3971 }
3972
3973 /* Heartbeat callback. This function is set as argument for the
3974    silc_socket_set_heartbeat function. The library will call this function
3975    at the set time interval. */
3976
3977 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3978                                    void *hb_context)
3979 {
3980   SilcServer server = hb_context;
3981
3982   SILC_LOG_DEBUG(("Sending heartbeat to %s:%d (%s)", sock->hostname,
3983                  sock->port, sock->ip));
3984
3985   /* Send the heartbeat */
3986   silc_server_send_heartbeat(server, sock);
3987 }
3988
3989 /* Returns assembled of all servers in the given ID list. The packet's
3990    form is dictated by the New ID payload. */
3991
3992 static void silc_server_announce_get_servers(SilcServer server,
3993                                              SilcServerEntry remote,
3994                                              SilcIDList id_list,
3995                                              SilcBuffer *servers,
3996                                              unsigned long creation_time)
3997 {
3998   SilcIDCacheList list;
3999   SilcIDCacheEntry id_cache;
4000   SilcServerEntry entry;
4001   SilcBuffer idp;
4002
4003   /* Go through all clients in the list */
4004   if (silc_idcache_get_all(id_list->servers, &list)) {
4005     if (silc_idcache_list_first(list, &id_cache)) {
4006       while (id_cache) {
4007         entry = (SilcServerEntry)id_cache->context;
4008
4009         /* Do not announce the one we've sending our announcements and
4010            do not announce ourself. Also check the creation time if it's
4011            provided. */
4012         if ((entry == remote) || (entry == server->id_entry) ||
4013             (creation_time && entry->data.created < creation_time)) {
4014           if (!silc_idcache_list_next(list, &id_cache))
4015             break;
4016           continue;
4017         }
4018
4019         idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
4020
4021         *servers = silc_buffer_realloc(*servers,
4022                                        (*servers ?
4023                                         (*servers)->truelen + idp->len :
4024                                         idp->len));
4025         silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
4026         silc_buffer_put(*servers, idp->data, idp->len);
4027         silc_buffer_pull(*servers, idp->len);
4028         silc_buffer_free(idp);
4029
4030         if (!silc_idcache_list_next(list, &id_cache))
4031           break;
4032       }
4033     }
4034
4035     silc_idcache_list_free(list);
4036   }
4037 }
4038
4039 static SilcBuffer
4040 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
4041 {
4042   va_list ap;
4043   SilcBuffer p;
4044
4045   va_start(ap, argc);
4046   p = silc_notify_payload_encode(notify, argc, ap);
4047   va_end(ap);
4048
4049   return p;
4050 }
4051
4052 /* This function is used by router to announce existing servers to our
4053    primary router when we've connected to it. If `creation_time' is non-zero
4054    then only the servers that has been created after the `creation_time'
4055    will be announced. */
4056
4057 void silc_server_announce_servers(SilcServer server, bool global,
4058                                   unsigned long creation_time,
4059                                   SilcSocketConnection remote)
4060 {
4061   SilcBuffer servers = NULL;
4062
4063   SILC_LOG_DEBUG(("Announcing servers"));
4064
4065   /* Get servers in local list */
4066   silc_server_announce_get_servers(server, remote->user_data,
4067                                    server->local_list, &servers,
4068                                    creation_time);
4069
4070   if (global)
4071     /* Get servers in global list */
4072     silc_server_announce_get_servers(server, remote->user_data,
4073                                      server->global_list, &servers,
4074                                      creation_time);
4075
4076   if (servers) {
4077     silc_buffer_push(servers, servers->data - servers->head);
4078     SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
4079
4080     /* Send the packet */
4081     silc_server_packet_send(server, remote,
4082                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4083                             servers->data, servers->len, TRUE);
4084
4085     silc_buffer_free(servers);
4086   }
4087 }
4088
4089 /* Returns assembled packet of all clients in the given ID list. The
4090    packet's form is dictated by the New ID Payload. */
4091
4092 static void silc_server_announce_get_clients(SilcServer server,
4093                                              SilcIDList id_list,
4094                                              SilcBuffer *clients,
4095                                              SilcBuffer *umodes,
4096                                              unsigned long creation_time)
4097 {
4098   SilcIDCacheList list;
4099   SilcIDCacheEntry id_cache;
4100   SilcClientEntry client;
4101   SilcBuffer idp;
4102   SilcBuffer tmp;
4103   unsigned char mode[4];
4104
4105   /* Go through all clients in the list */
4106   if (silc_idcache_get_all(id_list->clients, &list)) {
4107     if (silc_idcache_list_first(list, &id_cache)) {
4108       while (id_cache) {
4109         client = (SilcClientEntry)id_cache->context;
4110
4111         if (creation_time && client->data.created < creation_time) {
4112           if (!silc_idcache_list_next(list, &id_cache))
4113             break;
4114           continue;
4115         }
4116         if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED) &&
4117             !client->connection && !client->router && !SILC_IS_LOCAL(client)) {
4118           if (!silc_idcache_list_next(list, &id_cache))
4119             break;
4120           continue;
4121         }
4122
4123         idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4124
4125         *clients = silc_buffer_realloc(*clients,
4126                                        (*clients ?
4127                                         (*clients)->truelen + idp->len :
4128                                         idp->len));
4129         silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
4130         silc_buffer_put(*clients, idp->data, idp->len);
4131         silc_buffer_pull(*clients, idp->len);
4132
4133         SILC_PUT32_MSB(client->mode, mode);
4134         tmp =
4135           silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
4136                                              2, idp->data, idp->len,
4137                                              mode, 4);
4138         *umodes = silc_buffer_realloc(*umodes,
4139                                       (*umodes ?
4140                                        (*umodes)->truelen + tmp->len :
4141                                        tmp->len));
4142         silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
4143         silc_buffer_put(*umodes, tmp->data, tmp->len);
4144         silc_buffer_pull(*umodes, tmp->len);
4145         silc_buffer_free(tmp);
4146
4147         silc_buffer_free(idp);
4148
4149         if (!silc_idcache_list_next(list, &id_cache))
4150           break;
4151       }
4152     }
4153
4154     silc_idcache_list_free(list);
4155   }
4156 }
4157
4158 /* This function is used to announce our existing clients to our router
4159    when we've connected to it. If `creation_time' is non-zero then only
4160    the clients that has been created after the `creation_time' will be
4161    announced. */
4162
4163 void silc_server_announce_clients(SilcServer server,
4164                                   unsigned long creation_time,
4165                                   SilcSocketConnection remote)
4166 {
4167   SilcBuffer clients = NULL;
4168   SilcBuffer umodes = NULL;
4169
4170   SILC_LOG_DEBUG(("Announcing clients"));
4171
4172   /* Get clients in local list */
4173   silc_server_announce_get_clients(server, server->local_list,
4174                                    &clients, &umodes, creation_time);
4175
4176   /* As router we announce our global list as well */
4177   if (server->server_type == SILC_ROUTER)
4178     silc_server_announce_get_clients(server, server->global_list,
4179                                      &clients, &umodes, creation_time);
4180
4181   if (clients) {
4182     silc_buffer_push(clients, clients->data - clients->head);
4183     SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
4184
4185     /* Send the packet */
4186     silc_server_packet_send(server, remote,
4187                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4188                             clients->data, clients->len, TRUE);
4189
4190     silc_buffer_free(clients);
4191   }
4192
4193   if (umodes) {
4194     silc_buffer_push(umodes, umodes->data - umodes->head);
4195     SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
4196
4197     /* Send the packet */
4198     silc_server_packet_send(server, remote,
4199                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4200                             umodes->data, umodes->len, TRUE);
4201
4202     silc_buffer_free(umodes);
4203   }
4204 }
4205
4206 /* Returns channel's topic for announcing it */
4207
4208 void silc_server_announce_get_channel_topic(SilcServer server,
4209                                             SilcChannelEntry channel,
4210                                             SilcBuffer *topic)
4211 {
4212   SilcBuffer chidp;
4213
4214   if (channel->topic) {
4215     chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4216     *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
4217                                                 chidp->data, chidp->len,
4218                                                 channel->topic,
4219                                                 strlen(channel->topic));
4220     silc_buffer_free(chidp);
4221   }
4222 }
4223
4224 /* Returns assembled packets for channel users of the `channel'. */
4225
4226 void silc_server_announce_get_channel_users(SilcServer server,
4227                                             SilcChannelEntry channel,
4228                                             SilcBuffer *channel_modes,
4229                                             SilcBuffer *channel_users,
4230                                             SilcBuffer *channel_users_modes)
4231 {
4232   SilcChannelClientEntry chl;
4233   SilcHashTableList htl;
4234   SilcBuffer chidp, clidp, csidp;
4235   SilcBuffer tmp, fkey = NULL;
4236   int len;
4237   unsigned char mode[4];
4238   char *hmac;
4239
4240   SILC_LOG_DEBUG(("Start"));
4241
4242   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4243   csidp = silc_id_payload_encode(server->id, SILC_ID_SERVER);
4244
4245   /* CMODE notify */
4246   SILC_PUT32_MSB(channel->mode, mode);
4247   hmac = channel->hmac ? (char *)silc_hmac_get_name(channel->hmac) : NULL;
4248   if (channel->founder_key)
4249     fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4250   tmp =
4251     silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CMODE_CHANGE,
4252                                        6, csidp->data, csidp->len,
4253                                        mode, sizeof(mode),
4254                                        NULL, 0,
4255                                        hmac, hmac ? strlen(hmac) : 0,
4256                                        channel->passphrase,
4257                                        channel->passphrase ?
4258                                        strlen(channel->passphrase) : 0,
4259                                        fkey ? fkey->data : NULL,
4260                                        fkey ? fkey->len : 0);
4261   len = tmp->len;
4262   *channel_modes =
4263     silc_buffer_realloc(*channel_modes,
4264                         (*channel_modes ?
4265                          (*channel_modes)->truelen + len : len));
4266   silc_buffer_pull_tail(*channel_modes,
4267                         ((*channel_modes)->end -
4268                          (*channel_modes)->data));
4269   silc_buffer_put(*channel_modes, tmp->data, tmp->len);
4270   silc_buffer_pull(*channel_modes, len);
4271   silc_buffer_free(tmp);
4272   silc_buffer_free(fkey);
4273   fkey = NULL;
4274
4275   /* Now find all users on the channel */
4276   silc_hash_table_list(channel->user_list, &htl);
4277   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4278     clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4279
4280     /* JOIN Notify */
4281     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
4282                                              clidp->data, clidp->len,
4283                                              chidp->data, chidp->len);
4284     len = tmp->len;
4285     *channel_users =
4286       silc_buffer_realloc(*channel_users,
4287                           (*channel_users ?
4288                            (*channel_users)->truelen + len : len));
4289     silc_buffer_pull_tail(*channel_users,
4290                           ((*channel_users)->end -
4291                            (*channel_users)->data));
4292
4293     silc_buffer_put(*channel_users, tmp->data, tmp->len);
4294     silc_buffer_pull(*channel_users, len);
4295     silc_buffer_free(tmp);
4296
4297     /* CUMODE notify for mode change on the channel */
4298     SILC_PUT32_MSB(chl->mode, mode);
4299     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && channel->founder_key)
4300       fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4301     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
4302                                              4, csidp->data, csidp->len,
4303                                              mode, sizeof(mode),
4304                                              clidp->data, clidp->len,
4305                                              fkey ? fkey->data : NULL,
4306                                              fkey ? fkey->len : 0);
4307     len = tmp->len;
4308     *channel_users_modes =
4309       silc_buffer_realloc(*channel_users_modes,
4310                           (*channel_users_modes ?
4311                            (*channel_users_modes)->truelen + len : len));
4312     silc_buffer_pull_tail(*channel_users_modes,
4313                           ((*channel_users_modes)->end -
4314                            (*channel_users_modes)->data));
4315
4316     silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
4317     silc_buffer_pull(*channel_users_modes, len);
4318     silc_buffer_free(tmp);
4319     silc_buffer_free(fkey);
4320     fkey = NULL;
4321     silc_buffer_free(clidp);
4322   }
4323   silc_hash_table_list_reset(&htl);
4324   silc_buffer_free(chidp);
4325   silc_buffer_free(csidp);
4326 }
4327
4328 /* Returns assembled packets for all channels and users on those channels
4329    from the given ID List. The packets are in the form dictated by the
4330    New Channel and New Channel User payloads. */
4331
4332 void silc_server_announce_get_channels(SilcServer server,
4333                                        SilcIDList id_list,
4334                                        SilcBuffer *channels,
4335                                        SilcBuffer **channel_modes,
4336                                        SilcBuffer *channel_users,
4337                                        SilcBuffer **channel_users_modes,
4338                                        SilcUInt32 *channel_users_modes_c,
4339                                        SilcBuffer **channel_topics,
4340                                        SilcChannelID ***channel_ids,
4341                                        unsigned long creation_time)
4342 {
4343   SilcIDCacheList list;
4344   SilcIDCacheEntry id_cache;
4345   SilcChannelEntry channel;
4346   unsigned char *cid;
4347   SilcUInt32 id_len;
4348   SilcUInt16 name_len;
4349   int len;
4350   int i = *channel_users_modes_c;
4351   bool announce;
4352
4353   SILC_LOG_DEBUG(("Start"));
4354
4355   /* Go through all channels in the list */
4356   if (silc_idcache_get_all(id_list->channels, &list)) {
4357     if (silc_idcache_list_first(list, &id_cache)) {
4358       while (id_cache) {
4359         channel = (SilcChannelEntry)id_cache->context;
4360
4361         if (creation_time && channel->created < creation_time)
4362           announce = FALSE;
4363         else
4364           announce = TRUE;
4365
4366         cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4367         id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4368         name_len = strlen(channel->channel_name);
4369
4370         if (announce) {
4371           len = 4 + name_len + id_len + 4;
4372           *channels =
4373             silc_buffer_realloc(*channels,
4374                                 (*channels ? (*channels)->truelen +
4375                                  len : len));
4376           silc_buffer_pull_tail(*channels,
4377                                 ((*channels)->end - (*channels)->data));
4378           silc_buffer_format(*channels,
4379                              SILC_STR_UI_SHORT(name_len),
4380                              SILC_STR_UI_XNSTRING(channel->channel_name,
4381                                                   name_len),
4382                              SILC_STR_UI_SHORT(id_len),
4383                              SILC_STR_UI_XNSTRING(cid, id_len),
4384                              SILC_STR_UI_INT(channel->mode),
4385                              SILC_STR_END);
4386           silc_buffer_pull(*channels, len);
4387         }
4388
4389         if (creation_time && channel->updated < creation_time)
4390           announce = FALSE;
4391         else
4392           announce = TRUE;
4393
4394         if (announce) {
4395           /* Channel user modes */
4396           *channel_users_modes = silc_realloc(*channel_users_modes,
4397                                               sizeof(**channel_users_modes) *
4398                                               (i + 1));
4399           (*channel_users_modes)[i] = NULL;
4400           *channel_modes = silc_realloc(*channel_modes,
4401                                         sizeof(**channel_modes) * (i + 1));
4402           (*channel_modes)[i] = NULL;
4403           *channel_ids = silc_realloc(*channel_ids,
4404                                       sizeof(**channel_ids) * (i + 1));
4405           (*channel_ids)[i] = NULL;
4406           silc_server_announce_get_channel_users(server, channel,
4407                                                  &(*channel_modes)[i],
4408                                                  channel_users,
4409                                                  &(*channel_users_modes)[i]);
4410           (*channel_ids)[i] = channel->id;
4411
4412           /* Channel's topic */
4413           *channel_topics = silc_realloc(*channel_topics,
4414                                          sizeof(**channel_topics) * (i + 1));
4415           (*channel_topics)[i] = NULL;
4416           silc_server_announce_get_channel_topic(server, channel,
4417                                                  &(*channel_topics)[i]);
4418           (*channel_users_modes_c)++;
4419
4420           silc_free(cid);
4421
4422           i++;
4423         }
4424
4425         if (!silc_idcache_list_next(list, &id_cache))
4426           break;
4427       }
4428     }
4429
4430     silc_idcache_list_free(list);
4431   }
4432 }
4433
4434 /* This function is used to announce our existing channels to our router
4435    when we've connected to it. This also announces the users on the
4436    channels to the router. If the `creation_time' is non-zero only the
4437    channels that was created after the `creation_time' are announced.
4438    Note that the channel users are still announced even if the `creation_time'
4439    was provided. */
4440
4441 void silc_server_announce_channels(SilcServer server,
4442                                    unsigned long creation_time,
4443                                    SilcSocketConnection remote)
4444 {
4445   SilcBuffer channels = NULL, *channel_modes = NULL, channel_users = NULL;
4446   SilcBuffer *channel_users_modes = NULL;
4447   SilcBuffer *channel_topics = NULL;
4448   SilcUInt32 channel_users_modes_c = 0;
4449   SilcChannelID **channel_ids = NULL;
4450
4451   SILC_LOG_DEBUG(("Announcing channels and channel users"));
4452
4453   /* Get channels and channel users in local list */
4454   silc_server_announce_get_channels(server, server->local_list,
4455                                     &channels, &channel_modes,
4456                                     &channel_users,
4457                                     &channel_users_modes,
4458                                     &channel_users_modes_c,
4459                                     &channel_topics,
4460                                     &channel_ids, creation_time);
4461
4462   /* Get channels and channel users in global list */
4463   if (server->server_type != SILC_SERVER)
4464     silc_server_announce_get_channels(server, server->global_list,
4465                                       &channels, &channel_modes,
4466                                       &channel_users,
4467                                       &channel_users_modes,
4468                                       &channel_users_modes_c,
4469                                       &channel_topics,
4470                                       &channel_ids, creation_time);
4471
4472   if (channels) {
4473     silc_buffer_push(channels, channels->data - channels->head);
4474     SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
4475
4476     /* Send the packet */
4477     silc_server_packet_send(server, remote,
4478                             SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
4479                             channels->data, channels->len,
4480                             FALSE);
4481
4482     silc_buffer_free(channels);
4483   }
4484
4485   if (channel_users) {
4486     silc_buffer_push(channel_users, channel_users->data - channel_users->head);
4487     SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
4488                      channel_users->len);
4489
4490     /* Send the packet */
4491     silc_server_packet_send(server, remote,
4492                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4493                             channel_users->data, channel_users->len,
4494                             FALSE);
4495
4496     silc_buffer_free(channel_users);
4497   }
4498
4499   if (channel_modes) {
4500     int i;
4501
4502     for (i = 0; i < channel_users_modes_c; i++) {
4503       if (!channel_modes[i])
4504         continue;
4505       silc_buffer_push(channel_modes[i],
4506                        channel_modes[i]->data -
4507                        channel_modes[i]->head);
4508       SILC_LOG_HEXDUMP(("channel modes"), channel_modes[i]->data,
4509                        channel_modes[i]->len);
4510       silc_server_packet_send_dest(server, remote,
4511                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4512                                    channel_ids[i], SILC_ID_CHANNEL,
4513                                    channel_modes[i]->data,
4514                                    channel_modes[i]->len,
4515                                    FALSE);
4516       silc_buffer_free(channel_modes[i]);
4517     }
4518     silc_free(channel_modes);
4519   }
4520
4521   if (channel_users_modes) {
4522     int i;
4523
4524     for (i = 0; i < channel_users_modes_c; i++) {
4525       if (!channel_users_modes[i])
4526         continue;
4527       silc_buffer_push(channel_users_modes[i],
4528                        channel_users_modes[i]->data -
4529                        channel_users_modes[i]->head);
4530       SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
4531                        channel_users_modes[i]->len);
4532       silc_server_packet_send_dest(server, remote,
4533                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4534                                    channel_ids[i], SILC_ID_CHANNEL,
4535                                    channel_users_modes[i]->data,
4536                                    channel_users_modes[i]->len,
4537                                    FALSE);
4538       silc_buffer_free(channel_users_modes[i]);
4539     }
4540     silc_free(channel_users_modes);
4541   }
4542
4543   if (channel_topics) {
4544     int i;
4545
4546     for (i = 0; i < channel_users_modes_c; i++) {
4547       if (!channel_topics[i])
4548         continue;
4549
4550       silc_buffer_push(channel_topics[i],
4551                        channel_topics[i]->data -
4552                        channel_topics[i]->head);
4553       SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
4554                        channel_topics[i]->len);
4555       silc_server_packet_send_dest(server, remote,
4556                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4557                                    channel_ids[i], SILC_ID_CHANNEL,
4558                                    channel_topics[i]->data,
4559                                    channel_topics[i]->len,
4560                                    FALSE);
4561       silc_buffer_free(channel_topics[i]);
4562     }
4563     silc_free(channel_topics);
4564   }
4565
4566   silc_free(channel_ids);
4567 }
4568
4569 /* Failure timeout callback. If this is called then we will immediately
4570    process the received failure. We always process the failure with timeout
4571    since we do not want to blindly trust to received failure packets.
4572    This won't be called (the timeout is cancelled) if the failure was
4573    bogus (it is bogus if remote does not close the connection after sending
4574    the failure). */
4575
4576 SILC_TASK_CALLBACK(silc_server_failure_callback)
4577 {
4578   SilcServer server = app_context;
4579   SilcServerFailureContext f = (SilcServerFailureContext)context;
4580
4581   if (f->sock->protocol) {
4582     f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
4583     silc_protocol_execute(f->sock->protocol, server->schedule, 0, 0);
4584   }
4585
4586   silc_socket_free(f->sock);
4587   silc_free(f);
4588 }
4589
4590 /* Assembles user list and users mode list from the `channel'. */
4591
4592 bool silc_server_get_users_on_channel(SilcServer server,
4593                                       SilcChannelEntry channel,
4594                                       SilcBuffer *user_list,
4595                                       SilcBuffer *mode_list,
4596                                       SilcUInt32 *user_count)
4597 {
4598   SilcChannelClientEntry chl;
4599   SilcHashTableList htl;
4600   SilcBuffer client_id_list;
4601   SilcBuffer client_mode_list;
4602   SilcBuffer idp;
4603   SilcUInt32 list_count = 0, len = 0;
4604
4605   if (!silc_hash_table_count(channel->user_list))
4606     return FALSE;
4607
4608   silc_hash_table_list(channel->user_list, &htl);
4609   while (silc_hash_table_get(&htl, NULL, (void *)&chl))
4610     len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
4611   silc_hash_table_list_reset(&htl);
4612
4613   client_id_list = silc_buffer_alloc(len);
4614   client_mode_list =
4615     silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
4616   silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
4617   silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
4618
4619   silc_hash_table_list(channel->user_list, &htl);
4620   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4621     /* Client ID */
4622     idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4623     silc_buffer_put(client_id_list, idp->data, idp->len);
4624     silc_buffer_pull(client_id_list, idp->len);
4625     silc_buffer_free(idp);
4626
4627     /* Client's mode on channel */
4628     SILC_PUT32_MSB(chl->mode, client_mode_list->data);
4629     silc_buffer_pull(client_mode_list, 4);
4630
4631     list_count++;
4632   }
4633   silc_hash_table_list_reset(&htl);
4634   silc_buffer_push(client_id_list,
4635                    client_id_list->data - client_id_list->head);
4636   silc_buffer_push(client_mode_list,
4637                    client_mode_list->data - client_mode_list->head);
4638
4639   *user_list = client_id_list;
4640   *mode_list = client_mode_list;
4641   *user_count = list_count;
4642   return TRUE;
4643 }
4644
4645 /* Saves users and their modes to the `channel'. */
4646
4647 void silc_server_save_users_on_channel(SilcServer server,
4648                                        SilcSocketConnection sock,
4649                                        SilcChannelEntry channel,
4650                                        SilcClientID *noadd,
4651                                        SilcBuffer user_list,
4652                                        SilcBuffer mode_list,
4653                                        SilcUInt32 user_count)
4654 {
4655   int i;
4656   SilcUInt16 idp_len;
4657   SilcUInt32 mode;
4658   SilcClientID *client_id;
4659   SilcClientEntry client;
4660   SilcIDCacheEntry cache;
4661   SilcChannelClientEntry chl;
4662
4663   SILC_LOG_DEBUG(("Saving %d users on %s channel", user_count,
4664                   channel->channel_name));
4665
4666   for (i = 0; i < user_count; i++) {
4667     /* Client ID */
4668     SILC_GET16_MSB(idp_len, user_list->data + 2);
4669     idp_len += 4;
4670     client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
4671     silc_buffer_pull(user_list, idp_len);
4672     if (!client_id)
4673       continue;
4674
4675     /* Mode */
4676     SILC_GET32_MSB(mode, mode_list->data);
4677     silc_buffer_pull(mode_list, 4);
4678
4679     if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
4680       silc_free(client_id);
4681       continue;
4682     }
4683
4684     cache = NULL;
4685
4686     /* Check if we have this client cached already. */
4687     client = silc_idlist_find_client_by_id(server->local_list, client_id,
4688                                            server->server_type, &cache);
4689     if (!client)
4690       client = silc_idlist_find_client_by_id(server->global_list,
4691                                              client_id, server->server_type,
4692                                              &cache);
4693     if (!client) {
4694       /* If router did not find such Client ID in its lists then this must
4695          be bogus client or some router in the net is buggy. */
4696       if (server->server_type != SILC_SERVER) {
4697         silc_free(client_id);
4698         continue;
4699       }
4700
4701       /* We don't have that client anywhere, add it. The client is added
4702          to global list since server didn't have it in the lists so it must be
4703          global. */
4704       client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
4705                                       silc_id_dup(client_id, SILC_ID_CLIENT),
4706                                       sock->user_data, NULL, 0);
4707       if (!client) {
4708         SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
4709         silc_free(client_id);
4710         continue;
4711       }
4712
4713       client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
4714     }
4715
4716     if (cache)
4717       cache->expire = 0;
4718     silc_free(client_id);
4719
4720     if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED)) {
4721       SILC_LOG_ERROR(("Attempting to add unregistered client to channel ",
4722                       "%s", channel->channel_name));
4723       continue;
4724     }
4725
4726     if (!silc_server_client_on_channel(client, channel, &chl)) {
4727       /* Client was not on the channel, add it. */
4728       chl = silc_calloc(1, sizeof(*chl));
4729       chl->client = client;
4730       chl->mode = mode;
4731       chl->channel = channel;
4732       silc_hash_table_add(channel->user_list, chl->client, chl);
4733       silc_hash_table_add(client->channels, chl->channel, chl);
4734       channel->user_count++;
4735     } else {
4736       /* Update mode */
4737       chl->mode = mode;
4738     }
4739   }
4740 }
4741
4742 /* Saves channels and channels user modes to the `client'.  Removes
4743    the client from those channels that are not sent in the list but
4744    it has joined. */
4745
4746 void silc_server_save_user_channels(SilcServer server,
4747                                     SilcSocketConnection sock,
4748                                     SilcClientEntry client,
4749                                     SilcBuffer channels,
4750                                     SilcBuffer channels_user_modes)
4751 {
4752   SilcDList ch;
4753   SilcUInt32 *chumodes;
4754   SilcChannelPayload entry;
4755   SilcChannelEntry channel;
4756   SilcChannelID *channel_id;
4757   SilcChannelClientEntry chl;
4758   SilcHashTable ht = NULL;
4759   SilcHashTableList htl;
4760   char *name;
4761   int i = 0;
4762
4763   if (!channels || !channels_user_modes ||
4764       !(client->data.status & SILC_IDLIST_STATUS_REGISTERED))
4765     goto out;
4766
4767   ch = silc_channel_payload_parse_list(channels->data, channels->len);
4768   if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4769                                &chumodes)) {
4770     ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4771                                NULL, NULL, NULL, TRUE);
4772     silc_dlist_start(ch);
4773     while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4774       /* Check if we have this channel, and add it if we don't have it.
4775          Also add the client on the channel unless it is there already. */
4776       channel_id = silc_channel_get_id_parse(entry);
4777       channel = silc_idlist_find_channel_by_id(server->local_list,
4778                                                channel_id, NULL);
4779       if (!channel)
4780         channel = silc_idlist_find_channel_by_id(server->global_list,
4781                                                  channel_id, NULL);
4782       if (!channel) {
4783         if (server->server_type != SILC_SERVER) {
4784           silc_free(channel_id);
4785           i++;
4786           continue;
4787         }
4788
4789         /* We don't have that channel anywhere, add it. */
4790         name = silc_channel_get_name(entry, NULL);
4791         channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4792                                           channel_id, server->router,
4793                                           NULL, NULL, 0);
4794         if (!channel) {
4795           silc_free(channel_id);
4796           i++;
4797           continue;
4798         }
4799         channel_id = NULL;
4800       }
4801
4802       channel->mode = silc_channel_get_mode(entry);
4803
4804       /* Add the client on the channel */
4805       if (!silc_server_client_on_channel(client, channel, &chl)) {
4806         chl = silc_calloc(1, sizeof(*chl));
4807         chl->client = client;
4808         chl->mode = chumodes[i++];
4809         chl->channel = channel;
4810         silc_hash_table_add(channel->user_list, chl->client, chl);
4811         silc_hash_table_add(client->channels, chl->channel, chl);
4812         channel->user_count++;
4813       } else {
4814         /* Update mode */
4815         chl->mode = chumodes[i++];
4816       }
4817
4818       silc_hash_table_add(ht, channel, channel);
4819       silc_free(channel_id);
4820     }
4821     silc_channel_payload_list_free(ch);
4822     silc_free(chumodes);
4823   }
4824
4825  out:
4826   /* Go through the list again and remove client from channels that
4827      are no part of the list. */
4828   if (ht) {
4829     silc_hash_table_list(client->channels, &htl);
4830     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4831       if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4832         silc_hash_table_del(chl->channel->user_list, chl->client);
4833         silc_hash_table_del(chl->client->channels, chl->channel);
4834         silc_free(chl);
4835       }
4836     }
4837     silc_hash_table_list_reset(&htl);
4838     silc_hash_table_free(ht);
4839   } else {
4840     silc_hash_table_list(client->channels, &htl);
4841     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4842       silc_hash_table_del(chl->channel->user_list, chl->client);
4843       silc_hash_table_del(chl->client->channels, chl->channel);
4844       silc_free(chl);
4845     }
4846     silc_hash_table_list_reset(&htl);
4847   }
4848 }
4849
4850 /* Lookups route to the client indicated by the `id_data'. The connection
4851    object and internal data object is returned. Returns NULL if route
4852    could not be found to the client. If the `client_id' is specified then
4853    it is used and the `id_data' is ignored. */
4854
4855 SilcSocketConnection
4856 silc_server_get_client_route(SilcServer server,
4857                              unsigned char *id_data,
4858                              SilcUInt32 id_len,
4859                              SilcClientID *client_id,
4860                              SilcIDListData *idata,
4861                              SilcClientEntry *client_entry)
4862 {
4863   SilcClientID *id;
4864   SilcClientEntry client;
4865
4866   SILC_LOG_DEBUG(("Start"));
4867
4868   if (client_entry)
4869     *client_entry = NULL;
4870
4871   /* Decode destination Client ID */
4872   if (!client_id) {
4873     id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4874     if (!id) {
4875       SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4876       return NULL;
4877     }
4878   } else {
4879     id = silc_id_dup(client_id, SILC_ID_CLIENT);
4880   }
4881
4882   /* If the destination belongs to our server we don't have to route
4883      the packet anywhere but to send it to the local destination. */
4884   client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4885   if (client) {
4886     silc_free(id);
4887
4888     /* If we are router and the client has router then the client is in
4889        our cell but not directly connected to us. */
4890     if (server->server_type == SILC_ROUTER && client->router) {
4891       /* We are of course in this case the client's router thus the route
4892          to the client is the server who owns the client. So, we will send
4893          the packet to that server. */
4894       if (idata)
4895         *idata = (SilcIDListData)client->router;
4896       return client->router->connection;
4897     }
4898
4899     /* Seems that client really is directly connected to us */
4900     if (idata)
4901       *idata = (SilcIDListData)client;
4902     if (client_entry)
4903       *client_entry = client;
4904     return client->connection;
4905   }
4906
4907   /* Destination belongs to someone not in this server. If we are normal
4908      server our action is to send the packet to our router. */
4909   if (server->server_type != SILC_ROUTER && !server->standalone) {
4910     silc_free(id);
4911     if (idata)
4912       *idata = (SilcIDListData)server->router;
4913     return SILC_PRIMARY_ROUTE(server);
4914   }
4915
4916   /* We are router and we will perform route lookup for the destination
4917      and send the packet to fastest route. */
4918   if (server->server_type == SILC_ROUTER && !server->standalone) {
4919     /* Check first that the ID is valid */
4920     client = silc_idlist_find_client_by_id(server->global_list, id,
4921                                            TRUE, NULL);
4922     if (client) {
4923       SilcSocketConnection dst_sock;
4924
4925       dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4926
4927       silc_free(id);
4928       if (idata)
4929         *idata = (SilcIDListData)dst_sock->user_data;
4930       return dst_sock;
4931     }
4932   }
4933
4934   silc_free(id);
4935   return NULL;
4936 }
4937
4938 /* Encodes and returns channel list of channels the `client' has joined.
4939    Secret channels are not put to the list. */
4940
4941 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4942                                                SilcClientEntry client,
4943                                                bool get_private,
4944                                                bool get_secret,
4945                                                SilcBuffer *user_mode_list)
4946 {
4947   SilcBuffer buffer = NULL;
4948   SilcChannelEntry channel;
4949   SilcChannelClientEntry chl;
4950   SilcHashTableList htl;
4951   unsigned char *cid;
4952   SilcUInt32 id_len;
4953   SilcUInt16 name_len;
4954   int len;
4955
4956   if (user_mode_list)
4957     *user_mode_list = NULL;
4958
4959   silc_hash_table_list(client->channels, &htl);
4960   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4961     channel = chl->channel;
4962
4963     if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4964       continue;
4965     if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4966       continue;
4967
4968     cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4969     id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4970     name_len = strlen(channel->channel_name);
4971
4972     len = 4 + name_len + id_len + 4;
4973     buffer = silc_buffer_realloc(buffer,
4974                                  (buffer ? buffer->truelen + len : len));
4975     silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4976     silc_buffer_format(buffer,
4977                        SILC_STR_UI_SHORT(name_len),
4978                        SILC_STR_UI_XNSTRING(channel->channel_name,
4979                                             name_len),
4980                        SILC_STR_UI_SHORT(id_len),
4981                        SILC_STR_UI_XNSTRING(cid, id_len),
4982                        SILC_STR_UI_INT(chl->channel->mode),
4983                        SILC_STR_END);
4984     silc_buffer_pull(buffer, len);
4985     silc_free(cid);
4986
4987     if (user_mode_list) {
4988       *user_mode_list = silc_buffer_realloc(*user_mode_list,
4989                                             (*user_mode_list ?
4990                                              (*user_mode_list)->truelen + 4 :
4991                                              4));
4992       silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
4993                                               (*user_mode_list)->data));
4994       SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
4995       silc_buffer_pull(*user_mode_list, 4);
4996     }
4997   }
4998   silc_hash_table_list_reset(&htl);
4999
5000   if (buffer)
5001     silc_buffer_push(buffer, buffer->data - buffer->head);
5002   if (user_mode_list && *user_mode_list)
5003     silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
5004                                        (*user_mode_list)->head));
5005
5006   return buffer;
5007 }
5008
5009 /* A timeout callback for the re-key. We will be the initiator of the
5010    re-key protocol. */
5011
5012 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_callback)
5013 {
5014   SilcServer server = app_context;
5015   SilcSocketConnection sock = (SilcSocketConnection)context;
5016   SilcIDListData idata = (SilcIDListData)sock->user_data;
5017   SilcProtocol protocol;
5018   SilcServerRekeyInternalContext *proto_ctx;
5019
5020   /* Allocate internal protocol context. This is sent as context
5021      to the protocol. */
5022   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
5023   proto_ctx->server = (void *)server;
5024   proto_ctx->sock = sock;
5025   proto_ctx->responder = FALSE;
5026   proto_ctx->pfs = idata->rekey->pfs;
5027
5028   /* Perform rekey protocol. Will call the final callback after the
5029      protocol is over. */
5030   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
5031                       &protocol, proto_ctx, silc_server_rekey_final);
5032   sock->protocol = protocol;
5033
5034   /* Run the protocol */
5035   silc_protocol_execute(protocol, server->schedule, 0, 0);
5036
5037   SILC_LOG_DEBUG(("Rekey protocol completed"));
5038
5039   /* Re-register re-key timeout */
5040   silc_schedule_task_add(server->schedule, sock->sock,
5041                          silc_server_rekey_callback,
5042                          context, idata->rekey->timeout, 0,
5043                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
5044 }
5045
5046 /* The final callback for the REKEY protocol. This will actually take the
5047    new key material into use. */
5048
5049 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
5050 {
5051   SilcProtocol protocol = (SilcProtocol)context;
5052   SilcServerRekeyInternalContext *ctx =
5053     (SilcServerRekeyInternalContext *)protocol->context;
5054   SilcServer server = (SilcServer)ctx->server;
5055   SilcSocketConnection sock = ctx->sock;
5056
5057   SILC_LOG_DEBUG(("Start"));
5058
5059   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
5060       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
5061     /* Error occured during protocol */
5062     SILC_LOG_ERROR(("Error occurred during rekey protocol"));
5063     silc_protocol_cancel(protocol, server->schedule);
5064     silc_protocol_free(protocol);
5065     sock->protocol = NULL;
5066     if (ctx->packet)
5067       silc_packet_context_free(ctx->packet);
5068     if (ctx->ske)
5069       silc_ske_free(ctx->ske);
5070     silc_free(ctx);
5071     return;
5072   }
5073
5074   /* Purge the outgoing data queue to assure that all rekey packets really
5075      go to the network before we quit the protocol. */
5076   silc_server_packet_queue_purge(server, sock);
5077
5078   /* Cleanup */
5079   silc_protocol_free(protocol);
5080   sock->protocol = NULL;
5081   if (ctx->packet)
5082     silc_packet_context_free(ctx->packet);
5083   if (ctx->ske)
5084     silc_ske_free(ctx->ske);
5085   silc_free(ctx);
5086 }
5087
5088 /* Task callback used to retrieve network statistical information from
5089    router server once in a while. */
5090
5091 SILC_TASK_CALLBACK(silc_server_get_stats)
5092 {
5093   SilcServer server = (SilcServer)context;
5094   SilcBuffer idp, packet;
5095
5096   SILC_LOG_DEBUG(("Retrieving stats from router"));
5097
5098   if (!server->standalone) {
5099     idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
5100     packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
5101                                             ++server->cmd_ident, 1,
5102                                             1, idp->data, idp->len);
5103     silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
5104                             SILC_PACKET_COMMAND, 0, packet->data,
5105                             packet->len, FALSE);
5106     silc_buffer_free(packet);
5107     silc_buffer_free(idp);
5108   }
5109
5110   silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
5111                          server, 120, 0, SILC_TASK_TIMEOUT,
5112                          SILC_TASK_PRI_LOW);
5113 }