apps/silcd/server.c

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