apps/silcd/server.c

   1 /*
   2
   3   server.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 1997 - 2002 Pekka Riikonen
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; version 2 of the License.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18 */
  19 /*
  20  * This is the actual SILC server than handles everything relating to
  21  * servicing the SILC connections. This is also a SILC router as a router
  22  * is also normal server.
  23  */
  24 /* $Id$ */
  25
  26 #include "serverincludes.h"
  27 #include "server_internal.h"
  28
  29 /* Static prototypes */
  30 SILC_TASK_CALLBACK(silc_server_rehash_close_connection);
  31 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry);
  32 SILC_TASK_CALLBACK(silc_server_connect_router);
  33 SILC_TASK_CALLBACK(silc_server_connect_to_router_second);
  34 SILC_TASK_CALLBACK(silc_server_connect_to_router_final);
  35 SILC_TASK_CALLBACK(silc_server_accept_new_connection);
  36 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second);
  37 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final);
  38 SILC_TASK_CALLBACK(silc_server_packet_process);
  39 SILC_TASK_CALLBACK(silc_server_packet_parse_real);
  40 SILC_TASK_CALLBACK(silc_server_close_connection_final);
  41 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout);
  42 SILC_TASK_CALLBACK(silc_server_timeout_remote);
  43 SILC_TASK_CALLBACK(silc_server_channel_key_rekey);
  44 SILC_TASK_CALLBACK(silc_server_get_stats);
  45
  46 /* Allocates a new SILC server object. This has to be done before the server
  47    can be used. After allocation one must call silc_server_init to initialize
  48    the server. The new allocated server object is returned to the new_server
  49    argument. */
  50
  51 int silc_server_alloc(SilcServer *new_server)
  52 {
  53   SilcServer server;
  54
  55   SILC_LOG_DEBUG(("Allocating new server object"));
  56
  57   server = silc_calloc(1, sizeof(*server));
  58   server->server_type = SILC_SERVER;
  59   server->standalone = TRUE;
  60   server->local_list = silc_calloc(1, sizeof(*server->local_list));
  61   server->global_list = silc_calloc(1, sizeof(*server->global_list));
  62   server->pending_commands = silc_dlist_init();
  63 #ifdef SILC_SIM
  64   server->sim = silc_dlist_init();
  65 #endif
  66
  67   *new_server = server;
  68
  69   return TRUE;
  70 }
  71
  72 /* Free's the SILC server object. This is called at the very end before
  73    the program ends. */
  74
  75 void silc_server_free(SilcServer server)
  76 {
  77   SilcIDCacheList list;
  78   SilcIDCacheEntry cache;
  79
  80   if (!server)
  81     return;
  82
  83 #ifdef SILC_SIM
  84   {
  85     SilcSim sim;
  86     silc_dlist_start(server->sim);
  87     while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
  88       silc_dlist_del(server->sim, sim);
  89       silc_sim_close(sim);
  90       silc_sim_free(sim);
  91     }
  92     silc_dlist_uninit(server->sim);
  93   }
  94 #endif
  95
  96   silc_server_backup_free(server);
  97   silc_server_config_unref(&server->config_ref);
  98   if (server->rng)
  99     silc_rng_free(server->rng);
 100   if (server->pkcs)
 101     silc_pkcs_free(server->pkcs);
 102   if (server->public_key)
 103     silc_pkcs_public_key_free(server->public_key);
 104   if (server->private_key)
 105     silc_pkcs_private_key_free(server->private_key);
 106   if (server->pending_commands)
 107     silc_dlist_uninit(server->pending_commands);
 108   if (server->id_entry)
 109     silc_idlist_del_server(server->local_list, server->id_entry);
 110
 111   /* Delete all channels */
 112   list = NULL;
 113   if (silc_idcache_get_all(server->local_list->channels, &list) &&
 114       silc_idcache_list_first(list, &cache)) {
 115     silc_idlist_del_channel(server->local_list, cache->context);
 116     while (silc_idcache_list_next(list, &cache))
 117       silc_idlist_del_channel(server->local_list, cache->context);
 118   }
 119   if (list)
 120     silc_idcache_list_free(list);
 121   list = NULL;
 122   if (silc_idcache_get_all(server->global_list->channels, &list) &&
 123       silc_idcache_list_first(list, &cache)) {
 124     silc_idlist_del_channel(server->global_list, cache->context);
 125     while (silc_idcache_list_next(list, &cache))
 126       silc_idlist_del_channel(server->global_list, cache->context);
 127   }
 128   if (list)
 129     silc_idcache_list_free(list);
 130
 131   /* Delete all clients */
 132   list = NULL;
 133   if (silc_idcache_get_all(server->local_list->clients, &list) &&
 134       silc_idcache_list_first(list, &cache)) {
 135     silc_idlist_del_client(server->local_list, cache->context);
 136     while (silc_idcache_list_next(list, &cache))
 137       silc_idlist_del_client(server->local_list, cache->context);
 138   }
 139   if (list)
 140     silc_idcache_list_free(list);
 141   list = NULL;
 142   if (silc_idcache_get_all(server->global_list->clients, &list) &&
 143       silc_idcache_list_first(list, &cache)) {
 144     silc_idlist_del_client(server->global_list, cache->context);
 145     while (silc_idcache_list_next(list, &cache))
 146       silc_idlist_del_client(server->global_list, cache->context);
 147   }
 148   if (list)
 149     silc_idcache_list_free(list);
 150
 151   /* Delete all servers */
 152   list = NULL;
 153   if (silc_idcache_get_all(server->local_list->servers, &list) &&
 154       silc_idcache_list_first(list, &cache)) {
 155     silc_idlist_del_server(server->local_list, cache->context);
 156     while (silc_idcache_list_next(list, &cache))
 157       silc_idlist_del_server(server->local_list, cache->context);
 158   }
 159   if (list)
 160     silc_idcache_list_free(list);
 161   list = NULL;
 162   if (silc_idcache_get_all(server->global_list->servers, &list) &&
 163       silc_idcache_list_first(list, &cache)) {
 164     silc_idlist_del_server(server->global_list, cache->context);
 165     while (silc_idcache_list_next(list, &cache))
 166       silc_idlist_del_server(server->global_list, cache->context);
 167   }
 168   if (list)
 169     silc_idcache_list_free(list);
 170
 171   silc_idcache_free(server->local_list->clients);
 172   silc_idcache_free(server->local_list->servers);
 173   silc_idcache_free(server->local_list->channels);
 174   silc_idcache_free(server->global_list->clients);
 175   silc_idcache_free(server->global_list->servers);
 176   silc_idcache_free(server->global_list->channels);
 177   silc_hash_table_free(server->watcher_list);
 178
 179   silc_hash_free(server->md5hash);
 180   silc_hash_free(server->sha1hash);
 181   silc_hmac_unregister_all();
 182   silc_hash_unregister_all();
 183   silc_cipher_unregister_all();
 184   silc_pkcs_unregister_all();
 185
 186   silc_free(server->local_list);
 187   silc_free(server->global_list);
 188   silc_free(server->server_name);
 189   silc_free(server->id_string);
 190   silc_free(server->purge_i);
 191   silc_free(server->purge_g);
 192   silc_free(server);
 193 }
 194
 195 /* Creates a new server listener. */
 196
 197 static bool silc_server_listen(SilcServer server, const char *server_ip,
 198                                SilcUInt16 port, int *sock)
 199 {
 200   *sock = silc_net_create_server(port, server_ip);
 201   if (*sock < 0) {
 202     SILC_SERVER_LOG_ERROR(("Could not create server listener: %s on %hu",
 203                         server_ip, port));
 204     return FALSE;
 205   }
 206   return TRUE;
 207 }
 208
 209 /* Adds a secondary listener. */
 210
 211 bool silc_server_init_secondary(SilcServer server)
 212 {
 213   int sock = 0, sock_list[server->config->param.connections_max];
 214   SilcSocketConnection newsocket = NULL;
 215   SilcServerConfigServerInfoInterface *interface;
 216
 217   for (interface = server->config->server_info->secondary; interface;
 218         interface = interface->next, sock++) {
 219
 220     if (!silc_server_listen(server,
 221         interface->server_ip, interface->port, &sock_list[sock]))
 222       goto err;
 223
 224     /* Set socket to non-blocking mode */
 225     silc_net_set_socket_nonblock(sock_list[sock]);
 226
 227     /* Add ourselves also to the socket table. The entry allocated above
 228        is sent as argument for fast referencing in the future. */
 229     silc_socket_alloc(sock_list[sock],
 230                       SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
 231     server->sockets[sock_list[sock]] = newsocket;
 232     SILC_SET_LISTENER(newsocket);
 233
 234     /* Perform name and address lookups to resolve the listenning address
 235        and port. */
 236     if (!silc_net_check_local_by_sock(sock_list[sock], &newsocket->hostname,
 237                             &newsocket->ip)) {
 238       if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
 239         !newsocket->ip) {
 240         SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
 241                       newsocket->hostname ? newsocket->hostname :
 242                       newsocket->ip ? newsocket->ip : ""));
 243         server->stat.conn_failures++;
 244         goto err;
 245       }
 246       if (!newsocket->hostname)
 247         newsocket->hostname = strdup(newsocket->ip);
 248     }
 249     newsocket->port = silc_net_get_local_port(sock);
 250
 251     newsocket->user_data = (void *)server->id_entry;
 252     silc_schedule_task_add(server->schedule, sock_list[sock],
 253                            silc_server_accept_new_connection,
 254                            (void *)server, 0, 0,
 255                            SILC_TASK_FD,
 256                            SILC_TASK_PRI_NORMAL);
 257   }
 258
 259   return TRUE;
 260
 261  err:
 262   do silc_net_close_server(sock_list[sock--]); while (sock >= 0);
 263   return FALSE;
 264 }
 265
 266 /* Initializes the entire SILC server. This is called always before running
 267    the server. This is called only once at the initialization of the program.
 268    This binds the server to its listenning port. After this function returns
 269    one should call silc_server_run to start the server. This returns TRUE
 270    when everything is ok to run the server. Configuration file must be
 271    read and parsed before calling this. */
 272
 273 bool silc_server_init(SilcServer server)
 274 {
 275   int sock;
 276   SilcServerID *id;
 277   SilcServerEntry id_entry;
 278   SilcIDListPurge purge;
 279   SilcSocketConnection newsocket = NULL;
 280
 281   SILC_LOG_DEBUG(("Initializing server"));
 282
 283   server->starttime = time(NULL);
 284
 285   /* Take config object for us */
 286   silc_server_config_ref(&server->config_ref, server->config,
 287                          server->config);
 288
 289   /* Steal public and private key from the config object */
 290   server->public_key = server->config->server_info->public_key;
 291   server->private_key = server->config->server_info->private_key;
 292   server->config->server_info->public_key = NULL;
 293   server->config->server_info->private_key = NULL;
 294
 295   /* Register all configured ciphers, PKCS and hash functions. */
 296   if (!silc_server_config_register_ciphers(server))
 297     silc_cipher_register_default();
 298   if (!silc_server_config_register_pkcs(server))
 299     silc_pkcs_register_default();
 300   if (!silc_server_config_register_hashfuncs(server))
 301     silc_hash_register_default();
 302   if (!silc_server_config_register_hmacs(server))
 303     silc_hmac_register_default();
 304
 305   /* Initialize random number generator for the server. */
 306   server->rng = silc_rng_alloc();
 307   silc_rng_init(server->rng);
 308   silc_rng_global_init(server->rng);
 309
 310   /* Initialize hash functions for server to use */
 311   silc_hash_alloc("md5", &server->md5hash);
 312   silc_hash_alloc("sha1", &server->sha1hash);
 313
 314   /* Allocate PKCS context for local public and private keys */
 315   if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
 316     goto err;
 317   silc_pkcs_public_key_set(server->pkcs, server->public_key);
 318   silc_pkcs_private_key_set(server->pkcs, server->private_key);
 319
 320   /* Initialize the scheduler */
 321   server->schedule = silc_schedule_init(server->config->param.connections_max,
 322                                         server);
 323   if (!server->schedule)
 324     goto err;
 325
 326   /* First, register log files configuration for error output */
 327   silc_server_config_setlogfiles(server);
 328
 329   /* Initialize ID caches */
 330   server->local_list->clients =
 331     silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
 332   server->local_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
 333   server->local_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
 334
 335   /* These are allocated for normal server as well as these hold some
 336      global information that the server has fetched from its router. For
 337      router these are used as they are supposed to be used on router. */
 338   server->global_list->clients =
 339     silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
 340   server->global_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
 341   server->global_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
 342
 343   /* Init watcher list */
 344   server->watcher_list =
 345     silc_hash_table_alloc(1, silc_hash_client_id_hash, NULL,
 346                           silc_hash_data_compare, (void *)CLIENTID_HASH_LEN,
 347                           NULL, NULL, TRUE);
 348   if (!server->watcher_list)
 349     goto err;
 350
 351   /* Create a listening server */
 352   if (!silc_server_listen(server,
 353                 server->config->server_info->primary == NULL ? NULL :
 354                         server->config->server_info->primary->server_ip,
 355                 server->config->server_info->primary == NULL ? 0 :
 356                         server->config->server_info->primary->port,
 357                 &sock))
 358     goto err;
 359
 360   /* Set socket to non-blocking mode */
 361   silc_net_set_socket_nonblock(sock);
 362   server->sock = sock;
 363
 364   /* Allocate the entire socket list that is used in server. Eventually
 365      all connections will have entry in this table (it is a table of
 366      pointers to the actual object that is allocated individually
 367      later). */
 368   server->sockets = silc_calloc(server->config->param.connections_max,
 369                                 sizeof(*server->sockets));
 370   if (!server->sockets)
 371     goto err;
 372
 373   /* Add ourselves also to the socket table. The entry allocated above
 374      is sent as argument for fast referencing in the future. */
 375   silc_socket_alloc(sock, SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
 376   server->sockets[sock] = newsocket;
 377   SILC_SET_LISTENER(newsocket);
 378
 379   /* Perform name and address lookups to resolve the listenning address
 380      and port. */
 381   if (!silc_net_check_local_by_sock(sock, &newsocket->hostname,
 382                                     &newsocket->ip)) {
 383     if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
 384         !newsocket->ip) {
 385       SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
 386                       newsocket->hostname ? newsocket->hostname :
 387                       newsocket->ip ? newsocket->ip : ""));
 388       server->stat.conn_failures++;
 389       goto err;
 390     }
 391     if (!newsocket->hostname)
 392       newsocket->hostname = strdup(newsocket->ip);
 393   }
 394   newsocket->port = silc_net_get_local_port(sock);
 395
 396   /* Create a Server ID for the server. */
 397   silc_id_create_server_id(newsocket->ip, newsocket->port, server->rng, &id);
 398   if (!id)
 399     goto err;
 400
 401   server->id = id;
 402   server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
 403   server->id_string_len = silc_id_get_len(id, SILC_ID_SERVER);
 404   server->server_name = server->config->server_info->server_name;
 405   server->config->server_info->server_name = NULL;
 406
 407   /* Add ourselves to the server list. We don't have a router yet
 408      beacuse we haven't established a route yet. It will be done later.
 409      For now, NULL is sent as router. This allocates new entry to
 410      the ID list. */
 411   id_entry =
 412     silc_idlist_add_server(server->local_list, strdup(server->server_name),
 413                            server->server_type, server->id, NULL, NULL);
 414   if (!id_entry) {
 415     SILC_LOG_ERROR(("Could not add ourselves to cache"));
 416     goto err;
 417   }
 418   id_entry->data.status |= SILC_IDLIST_STATUS_REGISTERED;
 419
 420   /* Put the allocated socket pointer also to the entry allocated above
 421      for fast back-referencing to the socket list. */
 422   newsocket->user_data = (void *)id_entry;
 423   id_entry->connection = (void *)newsocket;
 424   server->id_entry = id_entry;
 425
 426   /* Register protocols */
 427   silc_server_protocols_register();
 428
 429   /* Add the first task to the scheduler. This is task that is executed by
 430      timeout. It expires as soon as the caller calls silc_server_run. This
 431      task performs authentication protocol and key exchange with our
 432      primary router. */
 433   silc_schedule_task_add(server->schedule, 0,
 434                          silc_server_connect_to_router,
 435                          (void *)server, 0, 1,
 436                          SILC_TASK_TIMEOUT,
 437                          SILC_TASK_PRI_NORMAL);
 438
 439   /* Add listener task to the scheduler. This task receives new connections
 440      to the server. This task remains on the queue until the end of the
 441      program. */
 442   silc_schedule_task_add(server->schedule, sock,
 443                          silc_server_accept_new_connection,
 444                          (void *)server, 0, 0,
 445                          SILC_TASK_FD,
 446                          SILC_TASK_PRI_NORMAL);
 447
 448   if (silc_server_init_secondary(server) == FALSE)
 449     goto err;
 450
 451   server->listenning = TRUE;
 452
 453   /* If server connections has been configured then we must be router as
 454      normal server cannot have server connections, only router connections. */
 455   if (server->config->servers) {
 456     SilcServerConfigServer *ptr = server->config->servers;
 457
 458     server->server_type = SILC_ROUTER;
 459     while (ptr) {
 460       if (ptr->backup_router) {
 461         server->server_type = SILC_BACKUP_ROUTER;
 462         server->backup_router = TRUE;
 463         server->id_entry->server_type = SILC_BACKUP_ROUTER;
 464         break;
 465       }
 466       ptr = ptr->next;
 467     }
 468   }
 469
 470   /* Register the ID Cache purge task. This periodically purges the ID cache
 471      and removes the expired cache entries. */
 472
 473   /* Clients local list */
 474   server->purge_i = purge = silc_calloc(1, sizeof(*purge));
 475   purge->cache = server->local_list->clients;
 476   purge->timeout = 600;
 477   silc_schedule_task_add(server->schedule, 0, silc_idlist_purge,
 478                          (void *)purge, purge->timeout, 0,
 479                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
 480
 481   /* Clients global list */
 482   server->purge_g = purge = silc_calloc(1, sizeof(*purge));
 483   purge->cache = server->global_list->clients;
 484   purge->timeout = 300;
 485   silc_schedule_task_add(server->schedule, 0, silc_idlist_purge,
 486                          (void *)purge, purge->timeout, 0,
 487                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
 488
 489   /* If we are normal server we'll retrieve network statisticial information
 490      once in a while from the router. */
 491   if (server->server_type != SILC_ROUTER)
 492     silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
 493                            server, 10, 0, SILC_TASK_TIMEOUT,
 494                            SILC_TASK_PRI_LOW);
 495
 496   if (server->server_type == SILC_ROUTER)
 497     server->stat.routers++;
 498
 499   SILC_LOG_DEBUG(("Server initialized"));
 500
 501   /* We are done here, return succesfully */
 502   return TRUE;
 503
 504  err:
 505   silc_server_config_unref(&server->config_ref);
 506   silc_net_close_server(sock);
 507   return FALSE;
 508 }
 509
 510 /* Task callback to close a socket connection after rehash */
 511
 512 SILC_TASK_CALLBACK(silc_server_rehash_close_connection)
 513 {
 514   SilcServer server = context;
 515   SilcSocketConnection sock = server->sockets[fd];
 516
 517   if (!sock)
 518     return;
 519
 520   SILC_LOG_INFO(("Connection %s:%d [%s] is unconfigured",
 521                  sock->hostname, sock->port,
 522                  (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
 523                   sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
 524                   sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
 525                   "Router")));
 526   silc_schedule_task_del_by_context(server->schedule, sock);
 527   silc_server_disconnect_remote(server, sock,
 528                                 SILC_STATUS_ERR_BANNED_FROM_SERVER,
 529                                 "This connection is removed from "
 530                                 "configuration");
 531   if (sock->user_data)
 532     silc_server_free_sock_user_data(server, sock, NULL);
 533 }
 534
 535 /* This function basically reads the config file again and switches the config
 536    object pointed by the server object. After that, we have to fix various
 537    things such as the server_name and the listening ports.
 538    Keep in mind that we no longer have the root privileges at this point. */
 539
 540 bool silc_server_rehash(SilcServer server)
 541 {
 542   SilcServerConfig newconfig;
 543
 544   SILC_LOG_INFO(("Rehashing server"));
 545
 546   /* Reset the logging system */
 547   silc_log_quick = TRUE;
 548   silc_log_flush_all();
 549
 550   /* Start the main rehash phase (read again the config file) */
 551   newconfig = silc_server_config_alloc(server->config_file);
 552   if (!newconfig) {
 553     SILC_LOG_ERROR(("Rehash FAILED."));
 554     return FALSE;
 555   }
 556
 557   /* Reinit scheduler if necessary */
 558   if (newconfig->param.connections_max > server->config->param.connections_max)
 559     if (!silc_schedule_reinit(server->schedule,
 560                               newconfig->param.connections_max))
 561       return FALSE;
 562
 563   /* Fix the server_name field */
 564   if (strcmp(server->server_name, newconfig->server_info->server_name)) {
 565     silc_free(server->server_name);
 566     server->server_name = newconfig->server_info->server_name;
 567     newconfig->server_info->server_name = NULL;
 568
 569     /* Update the idcache list with a fresh pointer */
 570     silc_free(server->id_entry->server_name);
 571     server->id_entry->server_name = strdup(server->server_name);
 572     if (!silc_idcache_del_by_context(server->local_list->servers,
 573                                      server->id_entry))
 574       return FALSE;
 575     if (!silc_idcache_add(server->local_list->servers,
 576                           server->id_entry->server_name,
 577                           server->id_entry->id, server->id_entry, 0, NULL))
 578       return FALSE;
 579   }
 580
 581   /* Set logging */
 582   silc_server_config_setlogfiles(server);
 583
 584   /* Change new key pair if necessary */
 585   if (newconfig->server_info->public_key &&
 586       !silc_pkcs_public_key_compare(server->public_key,
 587                                     newconfig->server_info->public_key)) {
 588     silc_pkcs_public_key_free(server->public_key);
 589     silc_pkcs_private_key_free(server->private_key);
 590     server->public_key = newconfig->server_info->public_key;
 591     server->private_key = newconfig->server_info->private_key;
 592     newconfig->server_info->public_key = NULL;
 593     newconfig->server_info->private_key = NULL;
 594
 595     /* Allocate PKCS context for local public and private keys */
 596     silc_pkcs_free(server->pkcs);
 597     if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
 598       return FALSE;
 599     silc_pkcs_public_key_set(server->pkcs, server->public_key);
 600     silc_pkcs_private_key_set(server->pkcs, server->private_key);
 601   }
 602
 603   /* Check for unconfigured server and router connections and close
 604      connections that were unconfigured. */
 605
 606   if (server->config->routers) {
 607     SilcServerConfigRouter *ptr;
 608     SilcServerConfigRouter *newptr;
 609     bool found;
 610
 611     for (ptr = server->config->routers; ptr; ptr = ptr->next) {
 612       found = FALSE;
 613
 614       /* Check whether new config has this one too */
 615       for (newptr = newconfig->routers; newptr; newptr = newptr->next) {
 616         if (silc_string_compare(newptr->host, ptr->host) &&
 617             newptr->port == ptr->port &&
 618             newptr->initiator == ptr->initiator) {
 619           found = TRUE;
 620           break;
 621         }
 622       }
 623
 624       if (!found && ptr->host) {
 625         /* Remove this connection */
 626         SilcSocketConnection sock;
 627         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_ROUTER,
 628                                                ptr->host, ptr->port);
 629         if (sock && !SILC_IS_LISTENER(sock))
 630           silc_schedule_task_add(server->schedule, sock->sock,
 631                                  silc_server_rehash_close_connection,
 632                                  server, 0, 1, SILC_TASK_TIMEOUT,
 633                                  SILC_TASK_PRI_NORMAL);
 634       }
 635     }
 636   }
 637
 638   if (server->config->servers) {
 639     SilcServerConfigServer *ptr;
 640     SilcServerConfigServer *newptr;
 641     bool found;
 642
 643     for (ptr = server->config->servers; ptr; ptr = ptr->next) {
 644       found = FALSE;
 645
 646       /* Check whether new config has this one too */
 647       for (newptr = newconfig->servers; newptr; newptr = newptr->next) {
 648         if (silc_string_compare(newptr->host, ptr->host)) {
 649           found = TRUE;
 650           break;
 651         }
 652       }
 653
 654       if (!found && ptr->host) {
 655         /* Remove this connection */
 656         SilcSocketConnection sock;
 657         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_SERVER,
 658                                                ptr->host, 0);
 659         if (sock && !SILC_IS_LISTENER(sock))
 660           silc_schedule_task_add(server->schedule, sock->sock,
 661                                  silc_server_rehash_close_connection,
 662                                  server, 0, 1, SILC_TASK_TIMEOUT,
 663                                  SILC_TASK_PRI_NORMAL);
 664       }
 665     }
 666   }
 667
 668   if (server->config->clients) {
 669     SilcServerConfigClient *ptr;
 670     SilcServerConfigClient *newptr;
 671     bool found;
 672
 673     for (ptr = server->config->clients; ptr; ptr = ptr->next) {
 674       found = FALSE;
 675
 676       /* Check whether new config has this one too */
 677       for (newptr = newconfig->clients; newptr; newptr = newptr->next) {
 678         if (silc_string_compare(newptr->host, ptr->host)) {
 679           found = TRUE;
 680           break;
 681         }
 682       }
 683
 684       if (!found && ptr->host) {
 685         /* Remove this connection */
 686         SilcSocketConnection sock;
 687         sock = silc_server_find_socket_by_host(server, SILC_SOCKET_TYPE_CLIENT,
 688                                                ptr->host, 0);
 689         if (sock)
 690           silc_schedule_task_add(server->schedule, sock->sock,
 691                                  silc_server_rehash_close_connection,
 692                                  server, 0, 1, SILC_TASK_TIMEOUT,
 693                                  SILC_TASK_PRI_NORMAL);
 694       }
 695     }
 696   }
 697
 698   /* Go through all configured routers after rehash */
 699   silc_schedule_task_add(server->schedule, 0,
 700                          silc_server_connect_to_router,
 701                          (void *)server, 0, 1,
 702                          SILC_TASK_TIMEOUT,
 703                          SILC_TASK_PRI_NORMAL);
 704
 705   /* Check whether our router status has changed */
 706   if (newconfig->servers) {
 707     SilcServerConfigServer *ptr = newconfig->servers;
 708
 709     server->server_type = SILC_ROUTER;
 710     while (ptr) {
 711       if (ptr->backup_router) {
 712         server->server_type = SILC_BACKUP_ROUTER;
 713         server->backup_router = TRUE;
 714         server->id_entry->server_type = SILC_BACKUP_ROUTER;
 715         break;
 716       }
 717       ptr = ptr->next;
 718     }
 719   }
 720
 721   /* Our old config is gone now. We'll unreference our reference made in
 722      silc_server_init and then destroy it since we are destroying it
 723      underneath the application (layer which called silc_server_init). */
 724   silc_server_config_unref(&server->config_ref);
 725   silc_server_config_destroy(server->config);
 726
 727   /* Take new config context */
 728   server->config = newconfig;
 729   silc_server_config_ref(&server->config_ref, server->config, server->config);
 730
 731   SILC_LOG_DEBUG(("Server rehashed"));
 732
 733   return TRUE;
 734 }
 735
 736 /* The heart of the server. This runs the scheduler thus runs the server.
 737    When this returns the server has been stopped and the program will
 738    be terminated. */
 739
 740 void silc_server_run(SilcServer server)
 741 {
 742   SILC_LOG_INFO(("SILC Server started"));
 743
 744   /* Start the scheduler, the heart of the SILC server. When this returns
 745      the program will be terminated. */
 746   silc_schedule(server->schedule);
 747 }
 748
 749 /* Stops the SILC server. This function is used to shutdown the server.
 750    This is usually called after the scheduler has returned. After stopping
 751    the server one should call silc_server_free. */
 752
 753 void silc_server_stop(SilcServer server)
 754 {
 755   SILC_LOG_INFO(("SILC Server shutting down"));
 756
 757   if (server->schedule) {
 758     int i;
 759
 760     server->server_shutdown = TRUE;
 761
 762     /* Close all connections */
 763     for (i = 0; i < server->config->param.connections_max; i++) {
 764       if (!server->sockets[i])
 765         continue;
 766       if (!SILC_IS_LISTENER(server->sockets[i])) {
 767         SilcSocketConnection sock = server->sockets[i];
 768         SilcIDListData idata = sock->user_data;
 769
 770         if (idata)
 771           idata->status &= ~SILC_IDLIST_STATUS_DISABLED;
 772
 773         silc_schedule_task_del_by_context(server->schedule,
 774                                           server->sockets[i]);
 775         silc_server_disconnect_remote(server, server->sockets[i],
 776                                       SILC_STATUS_OK,
 777                                       "Server is shutting down");
 778         if (sock->user_data)
 779           silc_server_free_sock_user_data(server, sock,
 780                                           "Server is shutting down");
 781         silc_socket_free(sock);
 782       } else {
 783         silc_socket_free(server->sockets[i]);
 784         server->sockets[i] = NULL;
 785       }
 786     }
 787
 788     /* We are not connected to network anymore */
 789     server->standalone = TRUE;
 790
 791     silc_schedule_stop(server->schedule);
 792     silc_schedule_uninit(server->schedule);
 793     server->schedule = NULL;
 794
 795     silc_free(server->sockets);
 796     server->sockets = NULL;
 797   }
 798
 799   silc_server_protocols_unregister();
 800
 801   SILC_LOG_DEBUG(("Server stopped"));
 802 }
 803
 804 /* Function that is called when the network connection to a router has
 805    been established.  This will continue with the key exchange protocol
 806    with the remote router. */
 807
 808 void silc_server_start_key_exchange(SilcServer server,
 809                                     SilcServerConnection sconn,
 810                                     int sock)
 811 {
 812   SilcSocketConnection newsocket;
 813   SilcProtocol protocol;
 814   SilcServerKEInternalContext *proto_ctx;
 815   SilcServerConfigRouter *conn =
 816     (SilcServerConfigRouter *) sconn->conn.ref_ptr;
 817   void *context;
 818
 819   /* Cancel any possible retry timeouts */
 820   silc_schedule_task_del_by_callback(server->schedule,
 821                                      silc_server_connect_to_router_retry);
 822
 823   /* Set socket options */
 824   silc_net_set_socket_nonblock(sock);
 825   silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
 826
 827   /* Create socket connection for the connection. Even though we
 828      know that we are connecting to a router we will mark the socket
 829      to be unknown connection until we have executed authentication
 830      protocol. */
 831   silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
 832   server->sockets[sock] = newsocket;
 833   newsocket->hostname = strdup(sconn->remote_host);
 834   newsocket->ip = strdup(sconn->remote_host);
 835   newsocket->port = sconn->remote_port;
 836   sconn->sock = newsocket;
 837
 838   /* Allocate internal protocol context. This is sent as context
 839      to the protocol. */
 840   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
 841   proto_ctx->server = (void *)server;
 842   proto_ctx->context = (void *)sconn;
 843   proto_ctx->sock = newsocket;
 844   proto_ctx->rng = server->rng;
 845   proto_ctx->responder = FALSE;
 846
 847   /* Set Key Exchange flags from configuration, but fall back to global
 848      settings too. */
 849   SILC_GET_SKE_FLAGS(conn, proto_ctx);
 850   if (server->config->param.key_exchange_pfs)
 851     proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
 852
 853   /* Perform key exchange protocol. silc_server_connect_to_router_second
 854      will be called after the protocol is finished. */
 855   silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
 856                       &protocol, proto_ctx,
 857                       silc_server_connect_to_router_second);
 858   newsocket->protocol = protocol;
 859
 860   /* Register a timeout task that will be executed if the protocol
 861      is not executed within set limit. */
 862   proto_ctx->timeout_task =
 863     silc_schedule_task_add(server->schedule, sock,
 864                            silc_server_timeout_remote,
 865                            server, server->config->key_exchange_timeout, 0,
 866                            SILC_TASK_TIMEOUT,
 867                            SILC_TASK_PRI_LOW);
 868
 869   /* Register the connection for network input and output. This sets
 870      that scheduler will listen for incoming packets for this connection
 871      and sets that outgoing packets may be sent to this connection as
 872      well. However, this doesn't set the scheduler for outgoing traffic,
 873      it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
 874      later when outgoing data is available. */
 875   context = (void *)server;
 876   SILC_REGISTER_CONNECTION_FOR_IO(sock);
 877
 878   /* Run the protocol */
 879   silc_protocol_execute(protocol, server->schedule, 0, 0);
 880 }
 881
 882 /* Timeout callback that will be called to retry connecting to remote
 883    router. This is used by both normal and router server. This will wait
 884    before retrying the connecting. The timeout is generated by exponential
 885    backoff algorithm. */
 886
 887 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
 888 {
 889   SilcServer server = app_context;
 890   SilcServerConnection sconn = (SilcServerConnection)context;
 891   SilcServerConfigRouter *conn = sconn->conn.ref_ptr;
 892   SilcServerConfigConnParams *param =
 893                 (conn->param ? conn->param : &server->config->param);
 894
 895   /* Don't retry if we are shutting down. */
 896   if (server->server_shutdown) {
 897     silc_server_config_unref(&sconn->conn);
 898     silc_free(sconn->remote_host);
 899     silc_free(sconn->backup_replace_ip);
 900     silc_free(sconn);
 901     return;
 902   }
 903
 904   SILC_LOG_INFO(("Retrying connecting to a router"));
 905
 906   /* Calculate next timeout */
 907   if (sconn->retry_count >= 1) {
 908     sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
 909     if (sconn->retry_timeout > param->reconnect_interval_max)
 910       sconn->retry_timeout = param->reconnect_interval_max;
 911   } else {
 912     sconn->retry_timeout = param->reconnect_interval;
 913   }
 914   sconn->retry_count++;
 915   sconn->retry_timeout = sconn->retry_timeout +
 916     silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
 917
 918   /* If we've reached max retry count, give up. */
 919   if ((sconn->retry_count > param->reconnect_count) &&
 920       !param->reconnect_keep_trying) {
 921     SILC_LOG_ERROR(("Could not connect to router, giving up"));
 922     silc_server_config_unref(&sconn->conn);
 923     silc_free(sconn->remote_host);
 924     silc_free(sconn->backup_replace_ip);
 925     silc_free(sconn);
 926     return;
 927   }
 928
 929   SILC_LOG_DEBUG(("Retrying connecting to a router in %d seconds",
 930                   sconn->retry_timeout));
 931
 932   /* We will lookup a fresh pointer later */
 933   silc_server_config_unref(&sconn->conn);
 934
 935   /* Wait one before retrying */
 936   silc_schedule_task_add(server->schedule, 0, silc_server_connect_router,
 937                          context, sconn->retry_timeout, 0,
 938                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
 939 }
 940
 941 /* Generic routine to use connect to a router. */
 942
 943 SILC_TASK_CALLBACK(silc_server_connect_router)
 944 {
 945   SilcServer server = app_context;
 946   SilcServerConnection sconn = (SilcServerConnection)context;
 947   SilcServerConfigRouter *rconn;
 948   int sock;
 949
 950   /* Don't connect if we are shutting down. */
 951   if (server->server_shutdown) {
 952     silc_free(sconn->remote_host);
 953     silc_free(sconn->backup_replace_ip);
 954     silc_free(sconn);
 955     return;
 956   }
 957
 958   SILC_LOG_INFO(("Connecting to the %s %s on port %d",
 959                  (sconn->backup ? "backup router" : "router"),
 960                  sconn->remote_host, sconn->remote_port));
 961
 962   server->router_connect = time(NULL);
 963   rconn = silc_server_config_find_router_conn(server, sconn->remote_host,
 964                                               sconn->remote_port);
 965   if (!rconn) {
 966     SILC_LOG_INFO(("Unconfigured %s connection %s:%d, cannot connect",
 967                    (sconn->backup ? "backup router" : "router"),
 968                    sconn->remote_host, sconn->remote_port));
 969     silc_free(sconn->remote_host);
 970     silc_free(sconn->backup_replace_ip);
 971     silc_free(sconn);
 972     return;
 973   }
 974   silc_server_config_ref(&sconn->conn, server->config, (void *)rconn);
 975
 976   /* Connect to remote host */
 977   sock = silc_net_create_connection(
 978                  (!server->config->server_info->primary ? NULL :
 979                   server->config->server_info->primary->server_ip),
 980                  sconn->remote_port, sconn->remote_host);
 981   if (sock < 0) {
 982     SILC_LOG_ERROR(("Could not connect to router %s:%d",
 983                     sconn->remote_host, sconn->remote_port));
 984     if (!sconn->no_reconnect)
 985       silc_schedule_task_add(server->schedule, 0,
 986                              silc_server_connect_to_router_retry,
 987                              context, 0, 1, SILC_TASK_TIMEOUT,
 988                              SILC_TASK_PRI_NORMAL);
 989     else {
 990       silc_server_config_unref(&sconn->conn);
 991       silc_free(sconn->remote_host);
 992       silc_free(sconn->backup_replace_ip);
 993       silc_free(sconn);
 994     }
 995     return;
 996   }
 997
 998   /* Continue with key exchange protocol */
 999   silc_server_start_key_exchange(server, sconn, sock);
1000 }
1001
1002 /* This function connects to our primary router or if we are a router this
1003    establishes all our primary routes. This is called at the start of the
1004    server to do authentication and key exchange with our router - called
1005    from schedule. */
1006
1007 SILC_TASK_CALLBACK_GLOBAL(silc_server_connect_to_router)
1008 {
1009   SilcServer server = (SilcServer)context;
1010   SilcServerConnection sconn;
1011   SilcServerConfigRouter *ptr;
1012
1013   /* Don't connect if we are shutting down. */
1014   if (server->server_shutdown)
1015     return;
1016
1017   SILC_LOG_DEBUG(("We are %s",
1018                   (server->server_type == SILC_SERVER ?
1019                    "normal server" : server->server_type == SILC_ROUTER ?
1020                    "router" : "backup router/normal server")));
1021
1022   if (!server->config->routers) {
1023     /* There wasn't a configured router, we will continue but we don't
1024        have a connection to outside world.  We will be standalone server. */
1025     SILC_LOG_DEBUG(("No router(s), we are standalone"));
1026     server->standalone = TRUE;
1027     return;
1028   }
1029
1030   /* Cancel any possible retry timeouts */
1031   silc_schedule_task_del_by_callback(server->schedule,
1032                                      silc_server_connect_router);
1033   silc_schedule_task_del_by_callback(server->schedule,
1034                                      silc_server_connect_to_router_retry);
1035
1036   /* Create the connections to all our routes */
1037   for (ptr = server->config->routers; ptr; ptr = ptr->next) {
1038
1039     SILC_LOG_DEBUG(("%s connection [%s] %s:%d",
1040                     ptr->backup_router ? "Backup router" : "Router",
1041                     ptr->initiator ? "Initiator" : "Responder",
1042                     ptr->host, ptr->port));
1043
1044     if (server->server_type == SILC_ROUTER && ptr->backup_router &&
1045         ptr->initiator == FALSE && !server->backup_router &&
1046         !silc_server_config_get_backup_router(server))
1047       server->wait_backup = TRUE;
1048
1049     if (ptr->initiator) {
1050       /* Check whether we are connected to this host already */
1051       if (silc_server_num_sockets_by_remote(server,
1052                                             silc_net_is_ip(ptr->host) ?
1053                                             ptr->host : NULL,
1054                                             silc_net_is_ip(ptr->host) ?
1055                                             NULL : ptr->host, ptr->port,
1056                                             SILC_SOCKET_TYPE_ROUTER)) {
1057         SILC_LOG_DEBUG(("We are already connected to this router"));
1058         continue;
1059       }
1060
1061       /* Allocate connection object for hold connection specific stuff. */
1062       sconn = silc_calloc(1, sizeof(*sconn));
1063       sconn->remote_host = strdup(ptr->host);
1064       sconn->remote_port = ptr->port;
1065       sconn->backup = ptr->backup_router;
1066       if (sconn->backup) {
1067         sconn->backup_replace_ip = strdup(ptr->backup_replace_ip);
1068         sconn->backup_replace_port = ptr->backup_replace_port;
1069       }
1070
1071       if (!server->router_conn && !sconn->backup)
1072         server->router_conn = sconn;
1073
1074       silc_schedule_task_add(server->schedule, 0,
1075                              silc_server_connect_router,
1076                              (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
1077                              SILC_TASK_PRI_NORMAL);
1078     }
1079   }
1080 }
1081
1082 /* Second part of connecting to router(s). Key exchange protocol has been
1083    executed and now we will execute authentication protocol. */
1084
1085 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
1086 {
1087   SilcProtocol protocol = (SilcProtocol)context;
1088   SilcServerKEInternalContext *ctx =
1089     (SilcServerKEInternalContext *)protocol->context;
1090   SilcServer server = (SilcServer)ctx->server;
1091   SilcServerConnection sconn = (SilcServerConnection)ctx->context;
1092   SilcSocketConnection sock = ctx->sock;
1093   SilcServerConnAuthInternalContext *proto_ctx;
1094   SilcServerConfigRouter *conn = NULL;
1095
1096   SILC_LOG_DEBUG(("Start"));
1097
1098   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1099       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1100     /* Error occured during protocol */
1101     silc_protocol_free(protocol);
1102     sock->protocol = NULL;
1103     silc_ske_free_key_material(ctx->keymat);
1104     if (ctx->packet)
1105       silc_packet_context_free(ctx->packet);
1106     if (ctx->ske)
1107       silc_ske_free(ctx->ske);
1108     silc_free(ctx->dest_id);
1109     silc_free(ctx);
1110     silc_server_disconnect_remote(server, sock,
1111                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1112
1113     /* Try reconnecting if configuration wants it */
1114     if (!sconn->no_reconnect) {
1115       silc_schedule_task_add(server->schedule, 0,
1116                              silc_server_connect_to_router_retry,
1117                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1118                              SILC_TASK_PRI_NORMAL);
1119       return;
1120     }
1121
1122     /* Call completion to indicate error */
1123     if (sconn->callback)
1124       (*sconn->callback)(server, NULL, sconn->callback_context);
1125
1126     silc_server_config_unref(&sconn->conn);
1127     silc_free(sconn->remote_host);
1128     silc_free(sconn->backup_replace_ip);
1129     silc_free(sconn);
1130     return;
1131   }
1132
1133   /* We now have the key material as the result of the key exchange
1134      protocol. Take the key material into use. Free the raw key material
1135      as soon as we've set them into use. */
1136   if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1137                                         ctx->sock, ctx->keymat,
1138                                         ctx->ske->prop->cipher,
1139                                         ctx->ske->prop->pkcs,
1140                                         ctx->ske->prop->hash,
1141                                         ctx->ske->prop->hmac,
1142                                         ctx->ske->prop->group,
1143                                         ctx->responder)) {
1144     silc_protocol_free(protocol);
1145     sock->protocol = NULL;
1146     silc_ske_free_key_material(ctx->keymat);
1147     if (ctx->packet)
1148       silc_packet_context_free(ctx->packet);
1149     if (ctx->ske)
1150       silc_ske_free(ctx->ske);
1151     silc_free(ctx->dest_id);
1152     silc_free(ctx);
1153     silc_server_disconnect_remote(server, sock,
1154                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1155
1156     /* Try reconnecting if configuration wants it */
1157     if (!sconn->no_reconnect) {
1158       silc_schedule_task_add(server->schedule, 0,
1159                              silc_server_connect_to_router_retry,
1160                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1161                              SILC_TASK_PRI_NORMAL);
1162       return;
1163     }
1164
1165     /* Call completion to indicate error */
1166     if (sconn->callback)
1167       (*sconn->callback)(server, NULL, sconn->callback_context);
1168
1169     silc_server_config_unref(&sconn->conn);
1170     silc_free(sconn->remote_host);
1171     silc_free(sconn->backup_replace_ip);
1172     silc_free(sconn);
1173     return;
1174   }
1175   silc_ske_free_key_material(ctx->keymat);
1176
1177   /* Allocate internal context for the authentication protocol. This
1178      is sent as context for the protocol. */
1179   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1180   proto_ctx->server = (void *)server;
1181   proto_ctx->context = (void *)sconn;
1182   proto_ctx->sock = sock;
1183   proto_ctx->ske = ctx->ske;       /* Save SKE object from previous protocol */
1184   proto_ctx->dest_id_type = ctx->dest_id_type;
1185   proto_ctx->dest_id = ctx->dest_id;
1186
1187   /* Resolve the authentication method used in this connection. Check if
1188      we find a match from user configured connections */
1189   if (!sconn->conn.ref_ptr)
1190     conn = silc_server_config_find_router_conn(server, sock->hostname,
1191                                                sock->port);
1192   else
1193     conn = sconn->conn.ref_ptr;
1194
1195   if (conn) {
1196     /* Match found. Use the configured authentication method. Take only
1197        the passphrase, since for public key auth we automatically use
1198        our local key pair. */
1199     if (conn->passphrase) {
1200       if (conn->publickeys && !server->config->prefer_passphrase_auth) {
1201         proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
1202       } else {
1203         proto_ctx->auth_data = strdup(conn->passphrase);
1204         proto_ctx->auth_data_len = strlen(conn->passphrase);
1205         proto_ctx->auth_meth = SILC_AUTH_PASSWORD;
1206       }
1207     } else if (conn->publickeys) {
1208       proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
1209     } else {
1210       proto_ctx->auth_meth = SILC_AUTH_NONE;
1211     }
1212   } else {
1213     SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
1214                     sock->hostname, sock->ip, sock->port));
1215     silc_protocol_free(protocol);
1216     sock->protocol = NULL;
1217     if (ctx->packet)
1218       silc_packet_context_free(ctx->packet);
1219     if (ctx->ske)
1220       silc_ske_free(ctx->ske);
1221     silc_free(ctx->dest_id);
1222     silc_free(ctx);
1223     silc_server_config_unref(&sconn->conn);
1224     silc_free(sconn->remote_host);
1225     silc_free(sconn->backup_replace_ip);
1226     silc_free(sconn);
1227     silc_server_disconnect_remote(server, sock,
1228                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1229     return;
1230   }
1231
1232   /* Free old protocol as it is finished now */
1233   silc_protocol_free(protocol);
1234   if (ctx->packet)
1235     silc_packet_context_free(ctx->packet);
1236   silc_free(ctx);
1237   sock->protocol = NULL;
1238
1239   /* Allocate the authentication protocol. This is allocated here
1240      but we won't start it yet. We will be receiving party of this
1241      protocol thus we will wait that connecting party will make
1242      their first move. */
1243   silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1244                       &sock->protocol, proto_ctx,
1245                       silc_server_connect_to_router_final);
1246
1247   /* Register timeout task. If the protocol is not executed inside
1248      this timelimit the connection will be terminated. */
1249   proto_ctx->timeout_task =
1250     silc_schedule_task_add(server->schedule, sock->sock,
1251                            silc_server_timeout_remote,
1252                            (void *)server,
1253                            server->config->conn_auth_timeout, 0,
1254                            SILC_TASK_TIMEOUT,
1255                            SILC_TASK_PRI_LOW);
1256
1257   /* Run the protocol */
1258   silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
1259 }
1260
1261 /* Finalizes the connection to router. Registers a server task to the
1262    queue so that we can accept new connections. */
1263
1264 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
1265 {
1266   SilcProtocol protocol = (SilcProtocol)context;
1267   SilcServerConnAuthInternalContext *ctx =
1268     (SilcServerConnAuthInternalContext *)protocol->context;
1269   SilcServer server = (SilcServer)ctx->server;
1270   SilcServerConnection sconn = (SilcServerConnection)ctx->context;
1271   SilcSocketConnection sock = ctx->sock;
1272   SilcServerEntry id_entry = NULL;
1273   SilcBuffer packet;
1274   unsigned char *id_string;
1275   SilcUInt32 id_len;
1276   SilcIDListData idata;
1277   SilcServerConfigRouter *conn = NULL;
1278   SilcServerConfigConnParams *param = NULL;
1279
1280   SILC_LOG_DEBUG(("Start"));
1281
1282   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1283       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1284     /* Error occured during protocol */
1285     silc_free(ctx->dest_id);
1286     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1287                                   NULL);
1288
1289     /* Try reconnecting if configuration wants it */
1290     if (!sconn->no_reconnect) {
1291       silc_schedule_task_add(server->schedule, 0,
1292                              silc_server_connect_to_router_retry,
1293                              sconn, 0, 1, SILC_TASK_TIMEOUT,
1294                              SILC_TASK_PRI_NORMAL);
1295       goto out2;
1296     }
1297
1298     goto out;
1299   }
1300
1301   /* Add a task to the queue. This task receives new connections to the
1302      server. This task remains on the queue until the end of the program. */
1303   if (!server->listenning && !sconn->backup) {
1304     silc_schedule_task_add(server->schedule, server->sock,
1305                            silc_server_accept_new_connection,
1306                            (void *)server, 0, 0,
1307                            SILC_TASK_FD,
1308                            SILC_TASK_PRI_NORMAL);
1309     server->listenning = TRUE;
1310   }
1311
1312   /* Send NEW_SERVER packet to the router. We will become registered
1313      to the SILC network after sending this packet. */
1314   id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
1315   id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
1316   packet = silc_buffer_alloc(2 + 2 + id_len + strlen(server->server_name));
1317   silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
1318   silc_buffer_format(packet,
1319                      SILC_STR_UI_SHORT(id_len),
1320                      SILC_STR_UI_XNSTRING(id_string, id_len),
1321                      SILC_STR_UI_SHORT(strlen(server->server_name)),
1322                      SILC_STR_UI_XNSTRING(server->server_name,
1323                                           strlen(server->server_name)),
1324                      SILC_STR_END);
1325
1326   /* Send the packet */
1327   silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
1328                           packet->data, packet->len, TRUE);
1329   silc_buffer_free(packet);
1330   silc_free(id_string);
1331
1332   SILC_LOG_INFO(("Connected to router %s", sock->hostname));
1333
1334   /* Check that we do not have this ID already */
1335   id_entry = silc_idlist_find_server_by_id(server->local_list,
1336                                            ctx->dest_id, TRUE, NULL);
1337   if (id_entry) {
1338     silc_idcache_del_by_context(server->local_list->servers, id_entry);
1339   } else {
1340     id_entry = silc_idlist_find_server_by_id(server->global_list,
1341                                              ctx->dest_id, TRUE, NULL);
1342     if (id_entry)
1343       silc_idcache_del_by_context(server->global_list->servers, id_entry);
1344   }
1345
1346   SILC_LOG_DEBUG(("New server id(%s)",
1347                   silc_id_render(ctx->dest_id, SILC_ID_SERVER)));
1348
1349   /* Add the connected router to global server list.  Router is sent
1350      as NULL since it's local to us. */
1351   id_entry = silc_idlist_add_server(server->global_list,
1352                                     strdup(sock->hostname),
1353                                     SILC_ROUTER, ctx->dest_id, NULL, sock);
1354   if (!id_entry) {
1355     silc_free(ctx->dest_id);
1356     SILC_LOG_ERROR(("Cannot add new server entry to cache"));
1357     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1358                                   NULL);
1359     goto out;
1360   }
1361
1362   silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1363   silc_free(sock->user_data);
1364   sock->user_data = (void *)id_entry;
1365   sock->type = SILC_SOCKET_TYPE_ROUTER;
1366   idata = (SilcIDListData)sock->user_data;
1367   idata->status |= (SILC_IDLIST_STATUS_REGISTERED |
1368                     SILC_IDLIST_STATUS_LOCAL);
1369
1370   conn = sconn->conn.ref_ptr;
1371   param = &server->config->param;
1372   if (conn && conn->param)
1373     param = conn->param;
1374
1375   /* Perform keepalive. */
1376   silc_socket_set_heartbeat(sock, param->keepalive_secs, server,
1377                             silc_server_perform_heartbeat,
1378                             server->schedule);
1379
1380   /* Register re-key timeout */
1381   idata->rekey->timeout = param->key_exchange_rekey;
1382   silc_schedule_task_add(server->schedule, sock->sock,
1383                          silc_server_rekey_callback,
1384                          (void *)sock, idata->rekey->timeout, 0,
1385                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1386
1387   if (!sconn->backup) {
1388     /* Mark this router our primary router if we're still standalone */
1389     if (server->standalone) {
1390       SILC_LOG_DEBUG(("This connection is our primary router"));
1391       server->id_entry->router = id_entry;
1392       server->router = id_entry;
1393       server->standalone = FALSE;
1394
1395       /* If we are router then announce our possible servers.  Backup
1396          router announces also global servers. */
1397       if (server->server_type == SILC_ROUTER)
1398         silc_server_announce_servers(server,
1399                                      server->backup_router ? TRUE : FALSE,
1400                                      0, SILC_PRIMARY_ROUTE(server));
1401
1402       /* Announce our clients and channels to the router */
1403       silc_server_announce_clients(server, 0, SILC_PRIMARY_ROUTE(server));
1404       silc_server_announce_channels(server, 0, SILC_PRIMARY_ROUTE(server));
1405
1406       /* If we are backup router then this primary router is whom we are
1407          backing up. */
1408       if (server->server_type == SILC_BACKUP_ROUTER)
1409         silc_server_backup_add(server, server->id_entry, sock->ip,
1410                                sconn->remote_port, TRUE);
1411     }
1412   } else {
1413     /* Add this server to be our backup router */
1414     silc_server_backup_add(server, id_entry, sconn->backup_replace_ip,
1415                            sconn->backup_replace_port, FALSE);
1416   }
1417
1418   sock->protocol = NULL;
1419
1420  out:
1421   /* Call the completion callback to indicate that we've connected to
1422      the router */
1423   if (sconn && sconn->callback)
1424     (*sconn->callback)(server, id_entry, sconn->callback_context);
1425
1426   /* Free the temporary connection data context */
1427   if (sconn) {
1428     silc_server_config_unref(&sconn->conn);
1429     silc_free(sconn->remote_host);
1430     silc_free(sconn->backup_replace_ip);
1431     silc_free(sconn);
1432   }
1433   if (sconn == server->router_conn)
1434     server->router_conn = NULL;
1435
1436  out2:
1437   /* Free the protocol object */
1438   if (sock->protocol == protocol)
1439     sock->protocol = NULL;
1440   silc_protocol_free(protocol);
1441   if (ctx->packet)
1442     silc_packet_context_free(ctx->packet);
1443   if (ctx->ske)
1444     silc_ske_free(ctx->ske);
1445   if (ctx->auth_meth == SILC_AUTH_PASSWORD)
1446     silc_free(ctx->auth_data);
1447   silc_free(ctx);
1448 }
1449
1450 /* Host lookup callback that is called after the incoming connection's
1451    IP and FQDN lookup is performed. This will actually check the acceptance
1452    of the incoming connection and will register the key exchange protocol
1453    for this connection. */
1454
1455 static void
1456 silc_server_accept_new_connection_lookup(SilcSocketConnection sock,
1457                                          void *context)
1458 {
1459   SilcServerKEInternalContext *proto_ctx =
1460     (SilcServerKEInternalContext *)context;
1461   SilcServer server = (SilcServer)proto_ctx->server;
1462   SilcServerConfigClient *cconfig = NULL;
1463   SilcServerConfigServer *sconfig = NULL;
1464   SilcServerConfigRouter *rconfig = NULL;
1465   SilcServerConfigDeny *deny;
1466   int port;
1467
1468   /* Check whether we could resolve both IP and FQDN. */
1469   if (!sock->ip || (!strcmp(sock->ip, sock->hostname) &&
1470                     server->config->require_reverse_lookup)) {
1471     SILC_LOG_ERROR(("IP/DNS lookup failed %s",
1472                     sock->hostname ? sock->hostname :
1473                     sock->ip ? sock->ip : ""));
1474     server->stat.conn_failures++;
1475     silc_server_disconnect_remote(server, sock,
1476                                   SILC_STATUS_ERR_INCOMPLETE_INFORMATION,
1477                                   "Unknown host or IP");
1478     silc_free(proto_ctx);
1479     return;
1480   }
1481
1482   /* Register the connection for network input and output. This sets
1483      that scheduler will listen for incoming packets for this connection
1484      and sets that outgoing packets may be sent to this connection as well.
1485      However, this doesn't set the scheduler for outgoing traffic, it
1486      will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1487      later when outgoing data is available. */
1488   context = (void *)server;
1489   SILC_REGISTER_CONNECTION_FOR_IO(sock->sock);
1490
1491   SILC_LOG_INFO(("Incoming connection %s (%s)", sock->hostname,
1492                  sock->ip));
1493
1494   /* Listenning port */
1495   if (!server->sockets[(SilcUInt32)proto_ctx->context]) {
1496     silc_server_disconnect_remote(server, sock,
1497                                   SILC_STATUS_ERR_RESOURCE_LIMIT,
1498                                   "Connection refused");
1499     server->stat.conn_failures++;
1500     silc_free(proto_ctx);
1501     return;
1502   }
1503   port = server->sockets[(SilcUInt32)proto_ctx->context]->port;
1504
1505   /* Check whether this connection is denied to connect to us. */
1506   deny = silc_server_config_find_denied(server, sock->ip);
1507   if (!deny)
1508     deny = silc_server_config_find_denied(server, sock->hostname);
1509   if (deny) {
1510     /* The connection is denied */
1511     SILC_LOG_INFO(("Connection %s (%s) is denied",
1512                    sock->hostname, sock->ip));
1513     silc_server_disconnect_remote(server, sock,
1514                                   SILC_STATUS_ERR_BANNED_FROM_SERVER,
1515                                   deny->reason);
1516     server->stat.conn_failures++;
1517     silc_free(proto_ctx);
1518     return;
1519   }
1520
1521   /* Check whether we have configured this sort of connection at all. We
1522      have to check all configurations since we don't know what type of
1523      connection this is. */
1524   if (!(cconfig = silc_server_config_find_client(server, sock->ip)))
1525     cconfig = silc_server_config_find_client(server, sock->hostname);
1526   if (!(sconfig = silc_server_config_find_server_conn(server, sock->ip)))
1527     sconfig = silc_server_config_find_server_conn(server, sock->hostname);
1528   if (server->server_type == SILC_ROUTER) {
1529     if (!(rconfig = silc_server_config_find_router_conn(server,
1530                                                         sock->ip, sock->port)))
1531       rconfig = silc_server_config_find_router_conn(server, sock->hostname,
1532                                                     sock->port);
1533   }
1534   if (!cconfig && !sconfig && !rconfig) {
1535     SILC_LOG_INFO(("Connection %s (%s) is not allowed", sock->hostname,
1536                    sock->ip));
1537     silc_server_disconnect_remote(server, sock,
1538                                   SILC_STATUS_ERR_BANNED_FROM_SERVER, NULL);
1539     server->stat.conn_failures++;
1540     silc_free(proto_ctx);
1541     return;
1542   }
1543
1544   /* The connection is allowed */
1545
1546   /* Set internal context for key exchange protocol. This is
1547      sent as context for the protocol. */
1548   proto_ctx->sock = sock;
1549   proto_ctx->rng = server->rng;
1550   proto_ctx->responder = TRUE;
1551   silc_server_config_ref(&proto_ctx->cconfig, server->config, cconfig);
1552   silc_server_config_ref(&proto_ctx->sconfig, server->config, sconfig);
1553   silc_server_config_ref(&proto_ctx->rconfig, server->config, rconfig);
1554
1555   /* Take flags for key exchange. Since we do not know what type of connection
1556      this is, we go through all found configurations and use the global ones
1557      as well. This will result always into strictest key exchange flags. */
1558   SILC_GET_SKE_FLAGS(cconfig, proto_ctx);
1559   SILC_GET_SKE_FLAGS(sconfig, proto_ctx);
1560   SILC_GET_SKE_FLAGS(rconfig, proto_ctx);
1561   if (server->config->param.key_exchange_pfs)
1562     proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
1563
1564   /* Prepare the connection for key exchange protocol. We allocate the
1565      protocol but will not start it yet. The connector will be the
1566      initiator of the protocol thus we will wait for initiation from
1567      there before we start the protocol. */
1568   server->stat.auth_attempts++;
1569   SILC_LOG_DEBUG(("Starting key exchange protocol"));
1570   silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1571                       &sock->protocol, proto_ctx,
1572                       silc_server_accept_new_connection_second);
1573
1574   /* Register a timeout task that will be executed if the connector
1575      will not start the key exchange protocol within specified timeout
1576      and the connection will be closed. */
1577   proto_ctx->timeout_task =
1578     silc_schedule_task_add(server->schedule, sock->sock,
1579                            silc_server_timeout_remote,
1580                            (void *)server,
1581                            server->config->key_exchange_timeout, 0,
1582                            SILC_TASK_TIMEOUT,
1583                            SILC_TASK_PRI_LOW);
1584 }
1585
1586 /* Accepts new connections to the server. Accepting new connections are
1587    done in three parts to make it async. */
1588
1589 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
1590 {
1591   SilcServer server = (SilcServer)context;
1592   SilcSocketConnection newsocket;
1593   SilcServerKEInternalContext *proto_ctx;
1594   int sock;
1595
1596   SILC_LOG_DEBUG(("Accepting new connection"));
1597
1598   server->stat.conn_attempts++;
1599
1600   sock = silc_net_accept_connection(fd);
1601   if (sock < 0) {
1602     SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
1603     server->stat.conn_failures++;
1604     return;
1605   }
1606
1607   /* Check for maximum allowed connections */
1608   if (sock > server->config->param.connections_max) {
1609     SILC_LOG_ERROR(("Refusing connection, server is full"));
1610     server->stat.conn_failures++;
1611     silc_net_close_connection(sock);
1612     return;
1613   }
1614
1615   /* Set socket options */
1616   silc_net_set_socket_nonblock(sock);
1617   silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
1618
1619   /* We don't create a ID yet, since we don't know what type of connection
1620      this is yet. But, we do add the connection to the socket table. */
1621   silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
1622   server->sockets[sock] = newsocket;
1623
1624   /* Perform asynchronous host lookup. This will lookup the IP and the
1625      FQDN of the remote connection. After the lookup is done the connection
1626      is accepted further. */
1627   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1628   proto_ctx->server = server;
1629   proto_ctx->context = (void *)fd;
1630   silc_socket_host_lookup(newsocket, TRUE,
1631                           silc_server_accept_new_connection_lookup,
1632                           (void *)proto_ctx, server->schedule);
1633 }
1634
1635 /* Second part of accepting new connection. Key exchange protocol has been
1636    performed and now it is time to do little connection authentication
1637    protocol to figure out whether this connection is client or server
1638    and whether it has right to access this server (especially server
1639    connections needs to be authenticated). */
1640
1641 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1642 {
1643   SilcProtocol protocol = (SilcProtocol)context;
1644   SilcServerKEInternalContext *ctx =
1645     (SilcServerKEInternalContext *)protocol->context;
1646   SilcServer server = (SilcServer)ctx->server;
1647   SilcSocketConnection sock = ctx->sock;
1648   SilcServerConnAuthInternalContext *proto_ctx;
1649
1650   SILC_LOG_DEBUG(("Start"));
1651
1652   if ((protocol->state == SILC_PROTOCOL_STATE_ERROR) ||
1653       (protocol->state == SILC_PROTOCOL_STATE_FAILURE)) {
1654     /* Error occured during protocol */
1655     SILC_LOG_DEBUG(("Error key exchange protocol"));
1656     silc_protocol_free(protocol);
1657     sock->protocol = NULL;
1658     silc_ske_free_key_material(ctx->keymat);
1659     if (ctx->packet)
1660       silc_packet_context_free(ctx->packet);
1661     if (ctx->ske)
1662       silc_ske_free(ctx->ske);
1663     silc_free(ctx->dest_id);
1664     silc_server_config_unref(&ctx->cconfig);
1665     silc_server_config_unref(&ctx->sconfig);
1666     silc_server_config_unref(&ctx->rconfig);
1667     silc_free(ctx);
1668     silc_server_disconnect_remote(server, sock,
1669                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
1670                                   NULL);
1671     server->stat.auth_failures++;
1672     return;
1673   }
1674
1675   /* We now have the key material as the result of the key exchange
1676      protocol. Take the key material into use. Free the raw key material
1677      as soon as we've set them into use. */
1678   if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1679                                         ctx->sock, ctx->keymat,
1680                                         ctx->ske->prop->cipher,
1681                                         ctx->ske->prop->pkcs,
1682                                         ctx->ske->prop->hash,
1683                                         ctx->ske->prop->hmac,
1684                                         ctx->ske->prop->group,
1685                                         ctx->responder)) {
1686     SILC_LOG_ERROR(("Error setting key material in use"));
1687     silc_protocol_free(protocol);
1688     sock->protocol = NULL;
1689     silc_ske_free_key_material(ctx->keymat);
1690     if (ctx->packet)
1691       silc_packet_context_free(ctx->packet);
1692     if (ctx->ske)
1693       silc_ske_free(ctx->ske);
1694     silc_free(ctx->dest_id);
1695     silc_server_config_unref(&ctx->cconfig);
1696     silc_server_config_unref(&ctx->sconfig);
1697     silc_server_config_unref(&ctx->rconfig);
1698     silc_free(ctx);
1699     silc_server_disconnect_remote(server, sock,
1700                                   SILC_STATUS_ERR_KEY_EXCHANGE_FAILED, NULL);
1701     server->stat.auth_failures++;
1702     return;
1703   }
1704   silc_ske_free_key_material(ctx->keymat);
1705
1706   /* Allocate internal context for the authentication protocol. This
1707      is sent as context for the protocol. */
1708   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1709   proto_ctx->server = (void *)server;
1710   proto_ctx->sock = sock;
1711   proto_ctx->ske = ctx->ske;    /* Save SKE object from previous protocol */
1712   proto_ctx->responder = TRUE;
1713   proto_ctx->dest_id_type = ctx->dest_id_type;
1714   proto_ctx->dest_id = ctx->dest_id;
1715   proto_ctx->cconfig = ctx->cconfig;
1716   proto_ctx->sconfig = ctx->sconfig;
1717   proto_ctx->rconfig = ctx->rconfig;
1718
1719   /* Free old protocol as it is finished now */
1720   silc_protocol_free(protocol);
1721   if (ctx->packet)
1722     silc_packet_context_free(ctx->packet);
1723   silc_free(ctx);
1724   sock->protocol = NULL;
1725
1726   /* Allocate the authentication protocol. This is allocated here
1727      but we won't start it yet. We will be receiving party of this
1728      protocol thus we will wait that connecting party will make
1729      their first move. */
1730   SILC_LOG_DEBUG(("Starting connection authentication protocol"));
1731   silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1732                       &sock->protocol, proto_ctx,
1733                       silc_server_accept_new_connection_final);
1734
1735   /* Register timeout task. If the protocol is not executed inside
1736      this timelimit the connection will be terminated. */
1737   proto_ctx->timeout_task =
1738     silc_schedule_task_add(server->schedule, sock->sock,
1739                            silc_server_timeout_remote,
1740                            (void *)server,
1741                            server->config->conn_auth_timeout, 0,
1742                            SILC_TASK_TIMEOUT,
1743                            SILC_TASK_PRI_LOW);
1744 }
1745
1746 /* After this is called, server don't wait for backup router anymore.
1747    This gets called automatically even after we have backup router
1748    connection established. */
1749
1750 SILC_TASK_CALLBACK(silc_server_backup_router_wait)
1751 {
1752   SilcServer server = context;
1753   server->wait_backup = FALSE;
1754 }
1755
1756 /* Final part of accepting new connection. The connection has now
1757    been authenticated and keys has been exchanged. We also know whether
1758    this is client or server connection. */
1759
1760 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1761 {
1762   SilcProtocol protocol = (SilcProtocol)context;
1763   SilcServerConnAuthInternalContext *ctx =
1764     (SilcServerConnAuthInternalContext *)protocol->context;
1765   SilcServer server = (SilcServer)ctx->server;
1766   SilcSocketConnection sock = ctx->sock;
1767   SilcUnknownEntry entry = (SilcUnknownEntry)sock->user_data;
1768   void *id_entry;
1769   SilcServerConfigConnParams *param = &server->config->param;
1770
1771   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1772       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1773     /* Error occured during protocol */
1774     SILC_LOG_DEBUG(("Error during authentication protocol"));
1775     silc_protocol_free(protocol);
1776     sock->protocol = NULL;
1777     if (ctx->packet)
1778       silc_packet_context_free(ctx->packet);
1779     if (ctx->ske)
1780       silc_ske_free(ctx->ske);
1781     silc_free(ctx->dest_id);
1782     silc_server_config_unref(&ctx->cconfig);
1783     silc_server_config_unref(&ctx->sconfig);
1784     silc_server_config_unref(&ctx->rconfig);
1785     silc_free(ctx);
1786     silc_server_disconnect_remote(server, sock, SILC_STATUS_ERR_AUTH_FAILED,
1787                                   NULL);
1788     server->stat.auth_failures++;
1789     return;
1790   }
1791
1792   entry->data.last_receive = time(NULL);
1793
1794   switch (ctx->conn_type) {
1795   case SILC_SOCKET_TYPE_CLIENT:
1796     {
1797       SilcClientEntry client;
1798       SilcServerConfigClient *conn = ctx->cconfig.ref_ptr;
1799
1800       /* Verify whether this connection is after all allowed to connect */
1801       if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1802                                           &server->config->param,
1803                                           conn->param, ctx->ske)) {
1804         server->stat.auth_failures++;
1805         goto out;
1806       }
1807
1808       /* If we are primary router and we have backup router configured
1809          but it has not connected to use yet, do not accept any other
1810          connection. */
1811       if (server->wait_backup && server->server_type == SILC_ROUTER &&
1812           !server->backup_router) {
1813         SilcServerConfigRouter *router;
1814         router = silc_server_config_get_backup_router(server);
1815         if (router && strcmp(server->config->server_info->primary->server_ip,
1816                              sock->ip) &&
1817             silc_server_find_socket_by_host(server,
1818                                             SILC_SOCKET_TYPE_SERVER,
1819                                             router->backup_replace_ip, 0)) {
1820           SILC_LOG_INFO(("Will not accept connections because we do "
1821                          "not have backup router connection established"));
1822           silc_server_disconnect_remote(server, sock,
1823                                         SILC_STATUS_ERR_PERM_DENIED,
1824                                         "We do not have connection to backup "
1825                                         "router established, try later");
1826           silc_free(sock->user_data);
1827           server->stat.auth_failures++;
1828
1829           /* From here on, wait 10 seconds for the backup router to appear. */
1830           silc_schedule_task_add(server->schedule, 0,
1831                                  silc_server_backup_router_wait,
1832                                  (void *)server, 10, 0,
1833                                  SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1834           goto out;
1835         }
1836       }
1837
1838       SILC_LOG_DEBUG(("Remote host is client"));
1839       SILC_LOG_INFO(("Connection %s (%s) is client", sock->hostname,
1840                      sock->ip));
1841
1842       /* Add the client to the client ID cache. The nickname and Client ID
1843          and other information is created after we have received NEW_CLIENT
1844          packet from client. */
1845       client = silc_idlist_add_client(server->local_list,
1846                                       NULL, NULL, NULL, NULL, NULL, sock, 0);
1847       if (!client) {
1848         SILC_LOG_ERROR(("Could not add new client to cache"));
1849         silc_free(sock->user_data);
1850         silc_server_disconnect_remote(server, sock,
1851                                       SILC_STATUS_ERR_AUTH_FAILED, NULL);
1852         server->stat.auth_failures++;
1853         goto out;
1854       }
1855       entry->data.status |= SILC_IDLIST_STATUS_LOCAL;
1856
1857       /* Statistics */
1858       server->stat.my_clients++;
1859       server->stat.clients++;
1860       server->stat.cell_clients++;
1861
1862       /* Get connection parameters */
1863       if (conn->param) {
1864         param = conn->param;
1865
1866         if (!param->keepalive_secs)
1867           param->keepalive_secs = server->config->param.keepalive_secs;
1868
1869         if (!param->qos && server->config->param.qos) {
1870           param->qos = server->config->param.qos;
1871           param->qos_rate_limit = server->config->param.qos_rate_limit;
1872           param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1873           param->qos_limit_sec = server->config->param.qos_limit_sec;
1874           param->qos_limit_usec = server->config->param.qos_limit_usec;
1875         }
1876
1877         /* Check if to be anonymous connection */
1878         if (param->anonymous)
1879           client->mode |= SILC_UMODE_ANONYMOUS;
1880       }
1881
1882       id_entry = (void *)client;
1883       break;
1884     }
1885   case SILC_SOCKET_TYPE_SERVER:
1886   case SILC_SOCKET_TYPE_ROUTER:
1887     {
1888       SilcServerEntry new_server;
1889       bool initiator = FALSE;
1890       bool backup_local = FALSE;
1891       bool backup_router = FALSE;
1892       char *backup_replace_ip = NULL;
1893       SilcUInt16 backup_replace_port = 0;
1894       SilcServerConfigServer *sconn = ctx->sconfig.ref_ptr;
1895       SilcServerConfigRouter *rconn = ctx->rconfig.ref_ptr;
1896
1897       /* If we are backup router and this is incoming server connection
1898          and we do not have connection to primary router, do not allow
1899          the connection. */
1900       if (server->server_type == SILC_BACKUP_ROUTER &&
1901           ctx->conn_type == SILC_SOCKET_TYPE_SERVER &&
1902           !SILC_PRIMARY_ROUTE(server)) {
1903         SILC_LOG_INFO(("Will not accept server connection because we do "
1904                        "not have primary router connection established"));
1905         silc_server_disconnect_remote(server, sock,
1906                                       SILC_STATUS_ERR_PERM_DENIED,
1907                                       "We do not have connection to primary "
1908                                       "router established, try later");
1909         silc_free(sock->user_data);
1910         server->stat.auth_failures++;
1911         goto out;
1912       }
1913
1914       if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
1915         /* Verify whether this connection is after all allowed to connect */
1916         if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1917                                             &server->config->param,
1918                                             rconn ? rconn->param : NULL,
1919                                             ctx->ske)) {
1920           silc_free(sock->user_data);
1921           server->stat.auth_failures++;
1922           goto out;
1923         }
1924
1925         if (rconn) {
1926           if (rconn->param) {
1927             param = rconn->param;
1928
1929             if (!param->keepalive_secs)
1930               param->keepalive_secs = server->config->param.keepalive_secs;
1931
1932             if (!param->qos && server->config->param.qos) {
1933               param->qos = server->config->param.qos;
1934               param->qos_rate_limit = server->config->param.qos_rate_limit;
1935               param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1936               param->qos_limit_sec = server->config->param.qos_limit_sec;
1937               param->qos_limit_usec = server->config->param.qos_limit_usec;
1938             }
1939           }
1940
1941           initiator = rconn->initiator;
1942           backup_local = rconn->backup_local;
1943           backup_router = rconn->backup_router;
1944           backup_replace_ip = rconn->backup_replace_ip;
1945           backup_replace_port = rconn->backup_replace_port;
1946         }
1947       }
1948
1949       if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
1950         /* Verify whether this connection is after all allowed to connect */
1951         if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1952                                             &server->config->param,
1953                                             sconn ? sconn->param : NULL,
1954                                             ctx->ske)) {
1955           silc_free(sock->user_data);
1956           server->stat.auth_failures++;
1957           goto out;
1958         }
1959         if (sconn) {
1960           if (sconn->param) {
1961             param = sconn->param;
1962
1963             if (!param->keepalive_secs)
1964               param->keepalive_secs = server->config->param.keepalive_secs;
1965
1966             if (!param->qos && server->config->param.qos) {
1967               param->qos = server->config->param.qos;
1968               param->qos_rate_limit = server->config->param.qos_rate_limit;
1969               param->qos_bytes_limit = server->config->param.qos_bytes_limit;
1970               param->qos_limit_sec = server->config->param.qos_limit_sec;
1971               param->qos_limit_usec = server->config->param.qos_limit_usec;
1972             }
1973           }
1974
1975           backup_router = sconn->backup_router;
1976         }
1977       }
1978
1979       /* If we are primary router and we have backup router configured
1980          but it has not connected to use yet, do not accept any other
1981          connection. */
1982       if (server->wait_backup && server->server_type == SILC_ROUTER &&
1983           !server->backup_router && !backup_router) {
1984         SilcServerConfigRouter *router;
1985         router = silc_server_config_get_backup_router(server);
1986         if (router && strcmp(server->config->server_info->primary->server_ip,
1987                              sock->ip) &&
1988             silc_server_find_socket_by_host(server,
1989                                             SILC_SOCKET_TYPE_SERVER,
1990                                             router->backup_replace_ip, 0)) {
1991           SILC_LOG_INFO(("Will not accept connections because we do "
1992                          "not have backup router connection established"));
1993           silc_server_disconnect_remote(server, sock,
1994                                         SILC_STATUS_ERR_PERM_DENIED,
1995                                         "We do not have connection to backup "
1996                                         "router established, try later");
1997           silc_free(sock->user_data);
1998           server->stat.auth_failures++;
1999
2000           /* From here on, wait 10 seconds for the backup router to appear. */
2001           silc_schedule_task_add(server->schedule, 0,
2002                                  silc_server_backup_router_wait,
2003                                  (void *)server, 10, 0,
2004                                  SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2005           goto out;
2006         }
2007       }
2008
2009       SILC_LOG_DEBUG(("Remote host is %s",
2010                       ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2011                       "server" : (backup_router ?
2012                                   "backup router" : "router")));
2013       SILC_LOG_INFO(("Connection %s (%s) is %s", sock->hostname,
2014                      sock->ip, ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2015                      "server" : (backup_router ?
2016                                  "backup router" : "router")));
2017
2018       /* Add the server into server cache. The server name and Server ID
2019          is updated after we have received NEW_SERVER packet from the
2020          server. We mark ourselves as router for this server if we really
2021          are router. */
2022       new_server =
2023         silc_idlist_add_server((ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2024                                 server->local_list : (backup_router ?
2025                                                       server->local_list :
2026                                                       server->global_list)),
2027                                NULL,
2028                                (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2029                                 SILC_SERVER : SILC_ROUTER),
2030                                NULL,
2031                                (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
2032                                 server->id_entry : (backup_router ?
2033                                                     server->id_entry : NULL)),
2034                                sock);
2035       if (!new_server) {
2036         SILC_LOG_ERROR(("Could not add new server to cache"));
2037         silc_free(sock->user_data);
2038         silc_server_disconnect_remote(server, sock,
2039                                       SILC_STATUS_ERR_AUTH_FAILED, NULL);
2040         server->stat.auth_failures++;
2041         goto out;
2042       }
2043       entry->data.status |= SILC_IDLIST_STATUS_LOCAL;
2044
2045       id_entry = (void *)new_server;
2046
2047       /* If the incoming connection is router and marked as backup router
2048          then add it to be one of our backups */
2049       if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER && backup_router) {
2050         /* Change it back to SERVER type since that's what it really is. */
2051         if (backup_local)
2052           ctx->conn_type = SILC_SOCKET_TYPE_SERVER;
2053         new_server->server_type = SILC_BACKUP_ROUTER;
2054
2055         SILC_SERVER_SEND_OPERS(server, FALSE, TRUE, SILC_NOTIFY_TYPE_NONE,
2056                                ("Backup router %s is now online",
2057                                 sock->hostname));
2058
2059         /* Remove the backup waiting with timeout */
2060         silc_schedule_task_add(server->schedule, 0,
2061                                silc_server_backup_router_wait,
2062                                (void *)server, 5, 0,
2063                                SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
2064       }
2065
2066       /* Statistics */
2067       if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
2068         server->stat.my_servers++;
2069       } else {
2070         server->stat.my_routers++;
2071         server->stat.routers++;
2072       }
2073       server->stat.servers++;
2074
2075       /* Check whether this connection is to be our primary router connection
2076          if we do not already have the primary route. */
2077       if (!backup_router &&
2078           server->standalone && ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
2079         if (silc_server_config_is_primary_route(server) && !initiator)
2080           break;
2081
2082         SILC_LOG_DEBUG(("We are not standalone server anymore"));
2083         server->standalone = FALSE;
2084         if (!server->id_entry->router) {
2085           server->id_entry->router = id_entry;
2086           server->router = id_entry;
2087         }
2088       }
2089
2090       break;
2091     }
2092   default:
2093     goto out;
2094     break;
2095   }
2096
2097   sock->type = ctx->conn_type;
2098
2099   /* Add the common data structure to the ID entry. */
2100   silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
2101
2102   /* Add to sockets internal pointer for fast referencing */
2103   silc_free(sock->user_data);
2104   sock->user_data = id_entry;
2105
2106   /* Connection has been fully established now. Everything is ok. */
2107   SILC_LOG_DEBUG(("New connection authenticated"));
2108
2109   /* Perform keepalive. */
2110   if (param->keepalive_secs)
2111     silc_socket_set_heartbeat(sock, param->keepalive_secs, server,
2112                               silc_server_perform_heartbeat,
2113                               server->schedule);
2114
2115   /* Perform Quality of Service */
2116   if (param->qos)
2117     silc_socket_set_qos(sock, param->qos_rate_limit, param->qos_bytes_limit,
2118                         param->qos_limit_sec, param->qos_limit_usec,
2119                         server->schedule);
2120
2121  out:
2122   silc_protocol_free(protocol);
2123   if (ctx->packet)
2124     silc_packet_context_free(ctx->packet);
2125   if (ctx->ske)
2126     silc_ske_free(ctx->ske);
2127   silc_free(ctx->dest_id);
2128   silc_server_config_unref(&ctx->cconfig);
2129   silc_server_config_unref(&ctx->sconfig);
2130   silc_server_config_unref(&ctx->rconfig);
2131   silc_free(ctx);
2132   sock->protocol = NULL;
2133 }
2134
2135 /* This function is used to read packets from network and send packets to
2136    network. This is usually a generic task. */
2137
2138 SILC_TASK_CALLBACK(silc_server_packet_process)
2139 {
2140   SilcServer server = (SilcServer)context;
2141   SilcSocketConnection sock = server->sockets[fd];
2142   SilcIDListData idata;
2143   SilcCipher cipher = NULL;
2144   SilcHmac hmac = NULL;
2145   SilcUInt32 sequence = 0;
2146   bool local_is_router;
2147   int ret;
2148
2149   if (!sock) {
2150     SILC_LOG_DEBUG(("Unknown socket connection"));
2151     return;
2152   }
2153
2154   /* Packet sending */
2155
2156   if (type == SILC_TASK_WRITE) {
2157     /* Do not send data to disconnected connection */
2158     if (SILC_IS_DISCONNECTED(sock)) {
2159       SILC_LOG_DEBUG(("Disconnected socket connection, cannot send"));
2160       return;
2161     }
2162
2163     server->stat.packets_sent++;
2164
2165     /* Send the packet */
2166     ret = silc_packet_send(sock, TRUE);
2167
2168     /* If returned -2 could not write to connection now, will do
2169        it later. */
2170     if (ret == -2)
2171       return;
2172
2173     /* The packet has been sent and now it is time to set the connection
2174        back to only for input. When there is again some outgoing data
2175        available for this connection it will be set for output as well.
2176        This call clears the output setting and sets it only for input. */
2177     SILC_SET_CONNECTION_FOR_INPUT(server->schedule, fd);
2178     SILC_UNSET_OUTBUF_PENDING(sock);
2179     silc_buffer_clear(sock->outbuf);
2180
2181     if (ret == -1) {
2182       SILC_LOG_ERROR(("Error sending packet to connection "
2183                       "%s:%d [%s]", sock->hostname, sock->port,
2184                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2185                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2186                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2187                        "Router")));
2188
2189       SILC_SET_DISCONNECTING(sock);
2190       if (sock->user_data)
2191         silc_server_free_sock_user_data(server, sock, NULL);
2192       silc_server_close_connection(server, sock);
2193     }
2194     return;
2195   }
2196
2197   /* Packet receiving */
2198
2199   /* Read some data from connection */
2200   ret = silc_packet_receive(sock);
2201   if (ret < 0) {
2202
2203     if (ret == -1) {
2204       SILC_LOG_ERROR(("Error receiving packet from connection "
2205                       "%s:%d [%s] %s", sock->hostname, sock->port,
2206                       (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2207                        sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2208                        sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2209                        "Router"), strerror(errno)));
2210
2211       SILC_SET_DISCONNECTING(sock);
2212       if (sock->user_data)
2213         silc_server_free_sock_user_data(server, sock, NULL);
2214       silc_server_close_connection(server, sock);
2215     }
2216     return;
2217   }
2218
2219   /* EOF */
2220   if (ret == 0) {
2221     SILC_LOG_DEBUG(("Read EOF"));
2222
2223     /* If connection is disconnecting already we will finally
2224        close the connection */
2225     if (SILC_IS_DISCONNECTING(sock)) {
2226       if (sock->user_data)
2227         silc_server_free_sock_user_data(server, sock, NULL);
2228       silc_server_close_connection(server, sock);
2229       return;
2230     }
2231
2232     SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
2233     SILC_SET_DISCONNECTING(sock);
2234
2235     if (sock->user_data) {
2236       char tmp[128];
2237       if (silc_socket_get_error(sock, tmp, sizeof(tmp) - 1))
2238         silc_server_free_sock_user_data(server, sock, tmp);
2239       else
2240         silc_server_free_sock_user_data(server, sock, NULL);
2241     } else if (server->router_conn && server->router_conn->sock == sock &&
2242                !server->router && server->standalone)
2243       silc_schedule_task_add(server->schedule, 0,
2244                              silc_server_connect_to_router,
2245                              server, 1, 0,
2246                              SILC_TASK_TIMEOUT,
2247                              SILC_TASK_PRI_NORMAL);
2248
2249     silc_server_close_connection(server, sock);
2250     return;
2251   }
2252
2253   /* If connection is disconnecting or disconnected we will ignore
2254      what we read. */
2255   if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
2256     SILC_LOG_DEBUG(("Ignoring read data from disconnected connection"));
2257     return;
2258   }
2259
2260   /* Get keys and stuff from ID entry */
2261   idata = (SilcIDListData)sock->user_data;
2262   if (idata) {
2263     cipher = idata->receive_key;
2264     hmac = idata->hmac_receive;
2265     sequence = idata->psn_receive;
2266   }
2267
2268   /* Then, process the packet. This will call the parser that will then
2269      decrypt and parse the packet. */
2270
2271   local_is_router = (server->server_type == SILC_ROUTER);
2272
2273   /* If socket connection is our primary, we are backup and we are doing
2274      backup resuming, we won't process the packet as being a router
2275      (affects channel message decryption). */
2276   if (server->backup_router && SILC_SERVER_IS_BACKUP(sock) &&
2277       SILC_PRIMARY_ROUTE(server) == sock)
2278     local_is_router = FALSE;
2279
2280   ret = silc_packet_receive_process(sock, local_is_router,
2281                                     cipher, hmac, sequence,
2282                                     silc_server_packet_parse, server);
2283
2284   /* If processing failed the connection is closed. */
2285   if (!ret) {
2286     /* On packet processing errors we may close our primary router
2287        connection but won't become primary router if we are the backup
2288        since this is local error condition. */
2289     if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2290       server->backup_noswitch = TRUE;
2291
2292     if (sock->user_data)
2293       silc_server_free_sock_user_data(server, sock, NULL);
2294     silc_server_close_connection(server, sock);
2295   }
2296 }
2297
2298 /* Parses whole packet, received earlier. */
2299
2300 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
2301 {
2302   SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
2303   SilcServer server = (SilcServer)parse_ctx->context;
2304   SilcSocketConnection sock = parse_ctx->sock;
2305   SilcPacketContext *packet = parse_ctx->packet;
2306   SilcIDListData idata = (SilcIDListData)sock->user_data;
2307   int ret;
2308
2309   server->stat.packets_received++;
2310
2311   /* Parse the packet */
2312   if (parse_ctx->normal)
2313     ret = silc_packet_parse(packet, idata ? idata->receive_key : NULL);
2314   else
2315     ret = silc_packet_parse_special(packet, idata ? idata->receive_key : NULL);
2316
2317   /* If entry is disabled ignore what we got. */
2318   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED &&
2319       ret != SILC_PACKET_HEARTBEAT && ret != SILC_PACKET_RESUME_ROUTER &&
2320       ret != SILC_PACKET_REKEY && ret != SILC_PACKET_REKEY_DONE) {
2321     SILC_LOG_DEBUG(("Connection is disabled"));
2322     goto out;
2323   }
2324
2325   if (ret == SILC_PACKET_NONE) {
2326     SILC_LOG_DEBUG(("Error parsing packet"));
2327     goto out;
2328   }
2329
2330   /* Check that the the current client ID is same as in the client's packet. */
2331   if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
2332     SilcClientEntry client = (SilcClientEntry)sock->user_data;
2333     if (client && client->id && packet->src_id) {
2334       void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
2335                                 packet->src_id_type);
2336       if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
2337         silc_free(id);
2338         SILC_LOG_DEBUG(("Packet source is not same as sender"));
2339         goto out;
2340       }
2341       silc_free(id);
2342     }
2343   }
2344
2345   if (server->server_type == SILC_ROUTER) {
2346     /* Route the packet if it is not destined to us. Other ID types but
2347        server are handled separately after processing them. */
2348     if (packet->dst_id && !(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
2349         packet->dst_id_type == SILC_ID_SERVER &&
2350         sock->type != SILC_SOCKET_TYPE_CLIENT &&
2351         memcmp(packet->dst_id, server->id_string, server->id_string_len)) {
2352
2353       /* Route the packet to fastest route for the destination ID */
2354       void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
2355                                 packet->dst_id_type);
2356       if (!id)
2357         goto out;
2358       silc_server_packet_route(server,
2359                                silc_server_route_get(server, id,
2360                                                      packet->dst_id_type),
2361                                packet);
2362       silc_free(id);
2363       goto out;
2364     }
2365   }
2366
2367   /* Parse the incoming packet type */
2368   silc_server_packet_parse_type(server, sock, packet);
2369
2370   /* Broadcast packet if it is marked as broadcast packet and it is
2371      originated from router and we are router. */
2372   if (server->server_type == SILC_ROUTER &&
2373       sock->type == SILC_SOCKET_TYPE_ROUTER &&
2374       packet->flags & SILC_PACKET_FLAG_BROADCAST) {
2375     /* Broadcast to our primary route */
2376     silc_server_packet_broadcast(server, SILC_PRIMARY_ROUTE(server), packet);
2377
2378     /* If we have backup routers then we need to feed all broadcast
2379        data to those servers. */
2380     silc_server_backup_broadcast(server, sock, packet);
2381   }
2382
2383  out:
2384   silc_packet_context_free(packet);
2385   silc_free(parse_ctx);
2386 }
2387
2388 /* Parser callback called by silc_packet_receive_process. This merely
2389    registers timeout that will handle the actual parsing when appropriate. */
2390
2391 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
2392                               void *context)
2393 {
2394   SilcServer server = (SilcServer)context;
2395   SilcSocketConnection sock = parser_context->sock;
2396   SilcIDListData idata = (SilcIDListData)sock->user_data;
2397   bool ret;
2398
2399   if (idata)
2400     idata->psn_receive = parser_context->packet->sequence + 1;
2401
2402   /* If protocol for this connection is key exchange or rekey then we'll
2403      process all packets synchronously, since there might be packets in
2404      queue that we are not able to decrypt without first processing the
2405      packets before them. */
2406   if ((parser_context->packet->type == SILC_PACKET_REKEY ||
2407        parser_context->packet->type == SILC_PACKET_REKEY_DONE) ||
2408       (sock->protocol && sock->protocol->protocol &&
2409        (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2410         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY))) {
2411     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2412                                   parser_context);
2413
2414     /* Reprocess data since we'll return FALSE here.  This is because
2415        the idata->receive_key might have become valid in the last packet
2416        and we want to call this processor with valid cipher. */
2417     if (idata)
2418       ret = silc_packet_receive_process(
2419                                   sock, server->server_type == SILC_ROUTER,
2420                                   idata->receive_key,
2421                                   idata->hmac_receive, idata->psn_receive,
2422                                   silc_server_packet_parse, server);
2423     else
2424       ret = silc_packet_receive_process(
2425                                   sock, server->server_type == SILC_ROUTER,
2426                                   NULL, NULL, 0,
2427                                   silc_server_packet_parse, server);
2428
2429     if (!ret) {
2430       /* On packet processing errors we may close our primary router
2431          connection but won't become primary router if we are the backup
2432          since this is local error condition. */
2433       if (SILC_PRIMARY_ROUTE(server) == sock && server->backup_router)
2434         server->backup_noswitch = TRUE;
2435
2436       if (sock->user_data)
2437         silc_server_free_sock_user_data(server, sock, NULL);
2438       silc_server_close_connection(server, sock);
2439     }
2440
2441     return FALSE;
2442   }
2443
2444   switch (sock->type) {
2445   case SILC_SOCKET_TYPE_UNKNOWN:
2446   case SILC_SOCKET_TYPE_CLIENT:
2447     /* Parse the packet with timeout */
2448     silc_schedule_task_add(server->schedule, sock->sock,
2449                            silc_server_packet_parse_real,
2450                            (void *)parser_context, 0, 100000,
2451                            SILC_TASK_TIMEOUT,
2452                            SILC_TASK_PRI_NORMAL);
2453     break;
2454   case SILC_SOCKET_TYPE_SERVER:
2455   case SILC_SOCKET_TYPE_ROUTER:
2456     /* Packets from servers are parsed immediately */
2457     silc_server_packet_parse_real(server->schedule, server, 0, sock->sock,
2458                                   parser_context);
2459     break;
2460   default:
2461     return TRUE;
2462   }
2463
2464   return TRUE;
2465 }
2466
2467 /* Parses the packet type and calls what ever routines the packet type
2468    requires. This is done for all incoming packets. */
2469
2470 void silc_server_packet_parse_type(SilcServer server,
2471                                    SilcSocketConnection sock,
2472                                    SilcPacketContext *packet)
2473 {
2474   SilcPacketType type = packet->type;
2475   SilcIDListData idata = (SilcIDListData)sock->user_data;
2476
2477   SILC_LOG_DEBUG(("Received %s packet [flags %d]",
2478                   silc_get_packet_name(type), packet->flags));
2479
2480   /* Parse the packet type */
2481   switch (type) {
2482   case SILC_PACKET_DISCONNECT:
2483     {
2484       SilcStatus status;
2485       char *message = NULL;
2486
2487       if (packet->flags & SILC_PACKET_FLAG_LIST)
2488         break;
2489       if (packet->buffer->len < 1)
2490         break;
2491
2492       status = (SilcStatus)packet->buffer->data[0];
2493       if (packet->buffer->len > 1 &&
2494           silc_utf8_valid(packet->buffer->data + 1, packet->buffer->len - 1))
2495         message = silc_memdup(packet->buffer->data + 1,
2496                               packet->buffer->len - 1);
2497
2498       SILC_LOG_INFO(("Disconnected by %s (%s): %s (%d) %s",
2499                      sock->ip, sock->hostname,
2500                      silc_get_status_message(status), status,
2501                      message ? message : ""));
2502       silc_free(message);
2503
2504       /* Handle the disconnection from our end too */
2505       if (sock->user_data && SILC_IS_LOCAL(sock->user_data))
2506         silc_server_free_sock_user_data(server, sock, NULL);
2507       silc_server_close_connection(server, sock);
2508     }
2509     break;
2510
2511   case SILC_PACKET_SUCCESS:
2512     /*
2513      * Success received for something. For now we can have only
2514      * one protocol for connection executing at once hence this
2515      * success message is for whatever protocol is executing currently.
2516      */
2517     if (packet->flags & SILC_PACKET_FLAG_LIST)
2518       break;
2519     if (sock->protocol)
2520       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2521     break;
2522
2523   case SILC_PACKET_FAILURE:
2524     /*
2525      * Failure received for something. For now we can have only
2526      * one protocol for connection executing at once hence this
2527      * failure message is for whatever protocol is executing currently.
2528      */
2529     if (packet->flags & SILC_PACKET_FLAG_LIST)
2530       break;
2531     if (sock->protocol) {
2532       sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
2533       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2534     }
2535     break;
2536
2537   case SILC_PACKET_REJECT:
2538     if (packet->flags & SILC_PACKET_FLAG_LIST)
2539       break;
2540     return;
2541     break;
2542
2543   case SILC_PACKET_NOTIFY:
2544     /*
2545      * Received notify packet. Server can receive notify packets from
2546      * router. Server then relays the notify messages to clients if needed.
2547      */
2548     if (packet->flags & SILC_PACKET_FLAG_LIST)
2549       silc_server_notify_list(server, sock, packet);
2550     else
2551       silc_server_notify(server, sock, packet);
2552     break;
2553
2554     /*
2555      * Channel packets
2556      */
2557   case SILC_PACKET_CHANNEL_MESSAGE:
2558     /*
2559      * Received channel message. Channel messages are special packets
2560      * (although probably most common ones) thus they are handled
2561      * specially.
2562      */
2563     if (packet->flags & SILC_PACKET_FLAG_LIST)
2564       break;
2565     idata->last_receive = time(NULL);
2566     silc_server_channel_message(server, sock, packet);
2567     break;
2568
2569   case SILC_PACKET_CHANNEL_KEY:
2570     /*
2571      * Received key for channel. As channels are created by the router
2572      * the keys are as well. We will distribute the key to all of our
2573      * locally connected clients on the particular channel. Router
2574      * never receives this channel and thus is ignored.
2575      */
2576     if (packet->flags & SILC_PACKET_FLAG_LIST)
2577       break;
2578     silc_server_channel_key(server, sock, packet);
2579     break;
2580
2581     /*
2582      * Command packets
2583      */
2584   case SILC_PACKET_COMMAND:
2585     /*
2586      * Recived command. Processes the command request and allocates the
2587      * command context and calls the command.
2588      */
2589     if (packet->flags & SILC_PACKET_FLAG_LIST)
2590       break;
2591     silc_server_command_process(server, sock, packet);
2592     break;
2593
2594   case SILC_PACKET_COMMAND_REPLY:
2595     /*
2596      * Received command reply packet. Received command reply to command. It
2597      * may be reply to command sent by us or reply to command sent by client
2598      * that we've routed further.
2599      */
2600     if (packet->flags & SILC_PACKET_FLAG_LIST)
2601       break;
2602     silc_server_command_reply(server, sock, packet);
2603     break;
2604
2605     /*
2606      * Private Message packets
2607      */
2608   case SILC_PACKET_PRIVATE_MESSAGE:
2609     /*
2610      * Received private message packet. The packet is coming from either
2611      * client or server.
2612      */
2613     if (packet->flags & SILC_PACKET_FLAG_LIST)
2614       break;
2615     idata->last_receive = time(NULL);
2616     silc_server_private_message(server, sock, packet);
2617     break;
2618
2619   case SILC_PACKET_PRIVATE_MESSAGE_KEY:
2620     /*
2621      * Private message key packet.
2622      */
2623     if (packet->flags & SILC_PACKET_FLAG_LIST)
2624       break;
2625     silc_server_private_message_key(server, sock, packet);
2626     break;
2627
2628     /*
2629      * Key Exchange protocol packets
2630      */
2631   case SILC_PACKET_KEY_EXCHANGE:
2632     if (packet->flags & SILC_PACKET_FLAG_LIST)
2633       break;
2634
2635     if (sock->protocol && sock->protocol->protocol &&
2636         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
2637       SilcServerKEInternalContext *proto_ctx =
2638         (SilcServerKEInternalContext *)sock->protocol->context;
2639
2640       proto_ctx->packet = silc_packet_context_dup(packet);
2641
2642       /* Let the protocol handle the packet */
2643       silc_protocol_execute(sock->protocol, server->schedule, 0, 100000);
2644     } else {
2645       SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
2646                       "protocol active, packet dropped."));
2647     }
2648     break;
2649
2650   case SILC_PACKET_KEY_EXCHANGE_1:
2651     if (packet->flags & SILC_PACKET_FLAG_LIST)
2652       break;
2653
2654     if (sock->protocol && sock->protocol->protocol &&
2655         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2656          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2657
2658       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2659         SilcServerRekeyInternalContext *proto_ctx =
2660           (SilcServerRekeyInternalContext *)sock->protocol->context;
2661
2662         if (proto_ctx->packet)
2663           silc_packet_context_free(proto_ctx->packet);
2664
2665         proto_ctx->packet = silc_packet_context_dup(packet);
2666
2667         /* Let the protocol handle the packet */
2668         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2669       } else {
2670         SilcServerKEInternalContext *proto_ctx =
2671           (SilcServerKEInternalContext *)sock->protocol->context;
2672
2673         if (proto_ctx->packet)
2674           silc_packet_context_free(proto_ctx->packet);
2675
2676         proto_ctx->packet = silc_packet_context_dup(packet);
2677         proto_ctx->dest_id_type = packet->src_id_type;
2678         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2679                                             packet->src_id_type);
2680         if (!proto_ctx->dest_id)
2681           break;
2682
2683         /* Let the protocol handle the packet */
2684         silc_protocol_execute(sock->protocol, server->schedule,
2685                               0, 100000);
2686       }
2687     } else {
2688       SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
2689                       "protocol active, packet dropped."));
2690     }
2691     break;
2692
2693   case SILC_PACKET_KEY_EXCHANGE_2:
2694     if (packet->flags & SILC_PACKET_FLAG_LIST)
2695       break;
2696
2697     if (sock->protocol && sock->protocol->protocol &&
2698         (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2699          sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2700
2701       if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2702         SilcServerRekeyInternalContext *proto_ctx =
2703           (SilcServerRekeyInternalContext *)sock->protocol->context;
2704
2705         if (proto_ctx->packet)
2706           silc_packet_context_free(proto_ctx->packet);
2707
2708         proto_ctx->packet = silc_packet_context_dup(packet);
2709
2710         /* Let the protocol handle the packet */
2711         silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2712       } else {
2713         SilcServerKEInternalContext *proto_ctx =
2714           (SilcServerKEInternalContext *)sock->protocol->context;
2715
2716         if (proto_ctx->packet)
2717           silc_packet_context_free(proto_ctx->packet);
2718
2719         proto_ctx->packet = silc_packet_context_dup(packet);
2720         proto_ctx->dest_id_type = packet->src_id_type;
2721         proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2722                                             packet->src_id_type);
2723         if (!proto_ctx->dest_id)
2724           break;
2725
2726         /* Let the protocol handle the packet */
2727         silc_protocol_execute(sock->protocol, server->schedule,
2728                               0, 100000);
2729       }
2730     } else {
2731       SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
2732                       "protocol active, packet dropped."));
2733     }
2734     break;
2735
2736   case SILC_PACKET_CONNECTION_AUTH_REQUEST:
2737     /*
2738      * Connection authentication request packet. When we receive this packet
2739      * we will send to the other end information about our mandatory
2740      * authentication method for the connection. This packet maybe received
2741      * at any time.
2742      */
2743     if (packet->flags & SILC_PACKET_FLAG_LIST)
2744       break;
2745     silc_server_connection_auth_request(server, sock, packet);
2746     break;
2747
2748     /*
2749      * Connection Authentication protocol packets
2750      */
2751   case SILC_PACKET_CONNECTION_AUTH:
2752     /* Start of the authentication protocol. We receive here the
2753        authentication data and will verify it. */
2754     if (packet->flags & SILC_PACKET_FLAG_LIST)
2755       break;
2756
2757     if (sock->protocol && sock->protocol->protocol->type
2758         == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
2759
2760       SilcServerConnAuthInternalContext *proto_ctx =
2761         (SilcServerConnAuthInternalContext *)sock->protocol->context;
2762
2763       proto_ctx->packet = silc_packet_context_dup(packet);
2764
2765       /* Let the protocol handle the packet */
2766       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2767     } else {
2768       SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
2769                       "protocol active, packet dropped."));
2770     }
2771     break;
2772
2773   case SILC_PACKET_NEW_ID:
2774     /*
2775      * Received New ID packet. This includes some new ID that has been
2776      * created. It may be for client, server or channel. This is the way
2777      * to distribute information about new registered entities in the
2778      * SILC network.
2779      */
2780     if (packet->flags & SILC_PACKET_FLAG_LIST)
2781       silc_server_new_id_list(server, sock, packet);
2782     else
2783       silc_server_new_id(server, sock, packet);
2784     break;
2785
2786   case SILC_PACKET_NEW_CLIENT:
2787     /*
2788      * Received new client packet. This includes client information that
2789      * we will use to create initial client ID. After creating new
2790      * ID we will send it to the client.
2791      */
2792     if (packet->flags & SILC_PACKET_FLAG_LIST)
2793       break;
2794     silc_server_new_client(server, sock, packet);
2795     break;
2796
2797   case SILC_PACKET_NEW_SERVER:
2798     /*
2799      * Received new server packet. This includes Server ID and some other
2800      * information that we may save. This is received after server has
2801      * connected to us.
2802      */
2803     if (packet->flags & SILC_PACKET_FLAG_LIST)
2804       break;
2805     silc_server_new_server(server, sock, packet);
2806     break;
2807
2808   case SILC_PACKET_NEW_CHANNEL:
2809     /*
2810      * Received new channel packet. Information about new channel in the
2811      * network are distributed using this packet.
2812      */
2813     if (packet->flags & SILC_PACKET_FLAG_LIST)
2814       silc_server_new_channel_list(server, sock, packet);
2815     else
2816       silc_server_new_channel(server, sock, packet);
2817     break;
2818
2819   case SILC_PACKET_HEARTBEAT:
2820     /*
2821      * Received heartbeat.
2822      */
2823     if (packet->flags & SILC_PACKET_FLAG_LIST)
2824       break;
2825     break;
2826
2827   case SILC_PACKET_KEY_AGREEMENT:
2828     /*
2829      * Received heartbeat.
2830      */
2831     if (packet->flags & SILC_PACKET_FLAG_LIST)
2832       break;
2833     silc_server_key_agreement(server, sock, packet);
2834     break;
2835
2836   case SILC_PACKET_REKEY:
2837     /*
2838      * Received re-key packet. The sender wants to regenerate the session
2839      * keys.
2840      */
2841     if (packet->flags & SILC_PACKET_FLAG_LIST)
2842       break;
2843     silc_server_rekey(server, sock, packet);
2844     break;
2845
2846   case SILC_PACKET_REKEY_DONE:
2847     /*
2848      * The re-key is done.
2849      */
2850     if (packet->flags & SILC_PACKET_FLAG_LIST)
2851       break;
2852
2853     if (sock->protocol && sock->protocol->protocol &&
2854         sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2855
2856       SilcServerRekeyInternalContext *proto_ctx =
2857         (SilcServerRekeyInternalContext *)sock->protocol->context;
2858
2859       if (proto_ctx->packet)
2860         silc_packet_context_free(proto_ctx->packet);
2861
2862       proto_ctx->packet = silc_packet_context_dup(packet);
2863
2864       /* Let the protocol handle the packet */
2865       silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2866     } else {
2867       SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2868                       "protocol active, packet dropped."));
2869     }
2870     break;
2871
2872   case SILC_PACKET_FTP:
2873     /* FTP packet */
2874     if (packet->flags & SILC_PACKET_FLAG_LIST)
2875       break;
2876     silc_server_ftp(server, sock, packet);
2877     break;
2878
2879   case SILC_PACKET_RESUME_CLIENT:
2880     /* Resume client */
2881     if (packet->flags & SILC_PACKET_FLAG_LIST)
2882       break;
2883     silc_server_resume_client(server, sock, packet);
2884     break;
2885
2886   case SILC_PACKET_RESUME_ROUTER:
2887     /* Resume router packet received. This packet is received for backup
2888        router resuming protocol. */
2889     if (packet->flags & SILC_PACKET_FLAG_LIST)
2890       break;
2891     silc_server_backup_resume_router(server, sock, packet);
2892     break;
2893
2894   default:
2895     SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2896     break;
2897   }
2898 }
2899
2900 /* Creates connection to a remote router. */
2901
2902 void silc_server_create_connection(SilcServer server,
2903                                    const char *remote_host, SilcUInt32 port)
2904 {
2905   SilcServerConnection sconn;
2906
2907   /* Allocate connection object for hold connection specific stuff. */
2908   sconn = silc_calloc(1, sizeof(*sconn));
2909   sconn->remote_host = strdup(remote_host);
2910   sconn->remote_port = port;
2911   sconn->no_reconnect = TRUE;
2912
2913   silc_schedule_task_add(server->schedule, 0,
2914                          silc_server_connect_router,
2915                          (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2916                          SILC_TASK_PRI_NORMAL);
2917 }
2918
2919 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2920 {
2921   silc_socket_free(context);
2922 }
2923
2924 /* Closes connection to socket connection */
2925
2926 void silc_server_close_connection(SilcServer server,
2927                                   SilcSocketConnection sock)
2928 {
2929   char tmp[128];
2930
2931   if (!server->sockets[sock->sock] && SILC_IS_DISCONNECTED(sock)) {
2932     silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2933     silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2934     silc_schedule_task_add(server->schedule, sock->sock,
2935                            silc_server_close_connection_final,
2936                            (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2937                            SILC_TASK_PRI_NORMAL);
2938     return;
2939   }
2940
2941   memset(tmp, 0, sizeof(tmp));
2942   silc_socket_get_error(sock, tmp, sizeof(tmp));
2943   SILC_LOG_INFO(("Closing connection %s:%d [%s] %s", sock->hostname,
2944                   sock->port,
2945                   (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2946                    sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2947                    sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2948                    "Router"), tmp[0] ? tmp : ""));
2949
2950   /* Unregister all tasks */
2951   silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2952
2953   /* Close the actual connection */
2954   silc_net_close_connection(sock->sock);
2955   server->sockets[sock->sock] = NULL;
2956
2957   /* If sock->user_data is NULL then we'll check for active protocols
2958      here since the silc_server_free_sock_user_data has not been called
2959      for this connection. */
2960   if (!sock->user_data) {
2961     /* If any protocol is active cancel its execution. It will call
2962        the final callback which will finalize the disconnection. */
2963     if (sock->protocol && sock->protocol->protocol &&
2964         sock->protocol->protocol->type != SILC_PROTOCOL_SERVER_BACKUP) {
2965       SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
2966       silc_protocol_cancel(sock->protocol, server->schedule);
2967       sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2968       silc_protocol_execute_final(sock->protocol, server->schedule);
2969       sock->protocol = NULL;
2970       return;
2971     }
2972   }
2973
2974   /* We won't listen for this connection anymore */
2975   silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2976
2977   silc_schedule_task_add(server->schedule, sock->sock,
2978                          silc_server_close_connection_final,
2979                          (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2980                          SILC_TASK_PRI_NORMAL);
2981 }
2982
2983 /* Sends disconnect message to remote connection and disconnects the
2984    connection. */
2985
2986 void silc_server_disconnect_remote(SilcServer server,
2987                                    SilcSocketConnection sock,
2988                                    SilcStatus status, ...)
2989 {
2990   va_list ap;
2991   unsigned char buf[512];
2992   SilcBuffer buffer;
2993   char *cp;
2994   int len;
2995
2996   if (!sock || SILC_IS_DISCONNECTED(sock))
2997     return;
2998
2999   memset(buf, 0, sizeof(buf));
3000   va_start(ap, status);
3001   cp = va_arg(ap, char *);
3002   if (cp) {
3003     vsnprintf(buf, sizeof(buf) - 1, cp, ap);
3004     cp = buf;
3005   }
3006   va_end(ap);
3007
3008   SILC_LOG_DEBUG(("Disconnecting remote host"));
3009
3010   /* Notify remote end that the conversation is over. The notify message
3011      is tried to be sent immediately. */
3012
3013   len = 1;
3014   if (cp)
3015     len += silc_utf8_encoded_len(buf, strlen(buf), SILC_STRING_ASCII);
3016
3017   buffer = silc_buffer_alloc_size(len);
3018   if (!buffer)
3019     goto out;
3020
3021   buffer->data[0] = status;
3022   if (cp)
3023     silc_utf8_encode(buf, strlen(buf), SILC_STRING_ASCII, buffer->data + 1,
3024                      buffer->len - 1);
3025   silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
3026                           buffer->data, buffer->len, TRUE);
3027   silc_buffer_free(buffer);
3028
3029  out:
3030   silc_server_packet_queue_purge(server, sock);
3031
3032   /* Mark the connection to be disconnected */
3033   SILC_SET_DISCONNECTED(sock);
3034   silc_server_close_connection(server, sock);
3035 }
3036
3037 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
3038 {
3039   SilcServer server = app_context;
3040   SilcClientEntry client = context;
3041
3042   assert(!silc_hash_table_count(client->channels));
3043
3044   silc_idlist_del_data(client);
3045   silc_idcache_purge_by_context(server->local_list->clients, client);
3046 }
3047
3048 /* Frees client data and notifies about client's signoff. */
3049
3050 void silc_server_free_client_data(SilcServer server,
3051                                   SilcSocketConnection sock,
3052                                   SilcClientEntry client,
3053                                   int notify,
3054                                   const char *signoff)
3055 {
3056   SILC_LOG_DEBUG(("Freeing client data"));
3057
3058   /* If there is pending outgoing data for the client then purge it
3059      to the network before removing the client entry. */
3060   silc_server_packet_queue_purge(server, sock);
3061
3062   if (client->id) {
3063     /* Check if anyone is watching this nickname */
3064     if (server->server_type == SILC_ROUTER)
3065       silc_server_check_watcher_list(server, client, NULL,
3066                                      SILC_NOTIFY_TYPE_SIGNOFF);
3067
3068     /* Send SIGNOFF notify to routers. */
3069     if (notify)
3070       silc_server_send_notify_signoff(server, SILC_PRIMARY_ROUTE(server),
3071                                       SILC_BROADCAST(server), client->id,
3072                                       signoff);
3073   }
3074
3075   /* Remove client from all channels */
3076   if (notify)
3077     silc_server_remove_from_channels(server, NULL, client,
3078                                      TRUE, (char *)signoff, TRUE, FALSE);
3079   else
3080     silc_server_remove_from_channels(server, NULL, client,
3081                                      FALSE, NULL, FALSE, FALSE);
3082
3083   /* Remove this client from watcher list if it is */
3084   silc_server_del_from_watcher_list(server, client);
3085
3086   /* Update statistics */
3087   server->stat.my_clients--;
3088   server->stat.clients--;
3089   if (server->stat.cell_clients)
3090     server->stat.cell_clients--;
3091   SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
3092   SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
3093   silc_schedule_task_del_by_context(server->schedule, client);
3094
3095   /* We will not delete the client entry right away. We will take it
3096      into history (for WHOWAS command) for 5 minutes, unless we're
3097      shutting down server. */
3098   if (!server->server_shutdown) {
3099     silc_schedule_task_add(server->schedule, 0,
3100                            silc_server_free_client_data_timeout,
3101                            client, 300, 0,
3102                            SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
3103     client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
3104     client->data.status &= ~SILC_IDLIST_STATUS_LOCAL;
3105     client->mode = 0;
3106     client->router = NULL;
3107     client->connection = NULL;
3108   } else {
3109     /* Delete directly since we're shutting down server */
3110     silc_idlist_del_data(client);
3111     silc_idlist_del_client(server->local_list, client);
3112   }
3113 }
3114
3115 /* Frees user_data pointer from socket connection object. This also sends
3116    appropriate notify packets to the network to inform about leaving
3117    entities. */
3118
3119 void silc_server_free_sock_user_data(SilcServer server,
3120                                      SilcSocketConnection sock,
3121                                      const char *signoff_message)
3122 {
3123   switch (sock->type) {
3124   case SILC_SOCKET_TYPE_CLIENT:
3125     {
3126       SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
3127       silc_server_free_client_data(server, sock, user_data, TRUE,
3128                                    signoff_message);
3129       break;
3130     }
3131   case SILC_SOCKET_TYPE_SERVER:
3132   case SILC_SOCKET_TYPE_ROUTER:
3133     {
3134       SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
3135       SilcServerEntry backup_router = NULL;
3136
3137       SILC_LOG_DEBUG(("Freeing server data"));
3138
3139       if (user_data->id)
3140         backup_router = silc_server_backup_get(server, user_data->id);
3141
3142       if (!server->backup_router && server->server_type == SILC_ROUTER &&
3143           backup_router == server->id_entry &&
3144           sock->type != SILC_SOCKET_TYPE_ROUTER)
3145         backup_router = NULL;
3146
3147       if (server->server_shutdown || server->backup_noswitch)
3148         backup_router = NULL;
3149
3150       /* If this was our primary router connection then we're lost to
3151          the outside world. */
3152       if (server->router == user_data) {
3153         /* Check whether we have a backup router connection */
3154         if (!backup_router || backup_router == user_data) {
3155           silc_schedule_task_add(server->schedule, 0,
3156                                  silc_server_connect_to_router,
3157                                  server, 1, 0,
3158                                  SILC_TASK_TIMEOUT,
3159                                  SILC_TASK_PRI_NORMAL);
3160
3161           server->id_entry->router = NULL;
3162           server->router = NULL;
3163           server->standalone = TRUE;
3164           server->backup_primary = FALSE;
3165           backup_router = NULL;
3166         } else {
3167           if (server->id_entry != backup_router) {
3168             SILC_LOG_INFO(("New primary router is backup router %s",
3169                            backup_router->server_name));
3170             server->id_entry->router = backup_router;
3171             server->router = backup_router;
3172             server->router_connect = time(0);
3173             server->backup_primary = TRUE;
3174           } else {
3175             SILC_LOG_INFO(("We are now new primary router in this cell"));
3176             server->id_entry->router = NULL;
3177             server->router = NULL;
3178             server->standalone = TRUE;
3179
3180             /* We stop here to take a breath */
3181             sleep(2);
3182           }
3183
3184           if (server->server_type == SILC_BACKUP_ROUTER) {
3185             server->server_type = SILC_ROUTER;
3186
3187             /* We'll need to constantly try to reconnect to the primary
3188                router so that we'll see when it comes back online. */
3189             silc_server_backup_reconnect(server, sock->ip, sock->port,
3190                                          silc_server_backup_connected,
3191                                          NULL);
3192           }
3193
3194           /* Mark this connection as replaced */
3195           silc_server_backup_replaced_add(server, user_data->id,
3196                                           backup_router);
3197         }
3198       } else if (backup_router) {
3199         SILC_LOG_INFO(("Enabling the use of backup router %s",
3200                        backup_router->server_name));
3201
3202         /* Mark this connection as replaced */
3203         silc_server_backup_replaced_add(server, user_data->id,
3204                                         backup_router);
3205       } else if (server->server_type == SILC_SERVER &&
3206                  sock->type == SILC_SOCKET_TYPE_ROUTER) {
3207         /* Reconnect to the router (backup) */
3208         silc_schedule_task_add(server->schedule, 0,
3209                                silc_server_connect_to_router,
3210                                server, 1, 0,
3211                                SILC_TASK_TIMEOUT,
3212                                SILC_TASK_PRI_NORMAL);
3213       }
3214
3215       SILC_SERVER_SEND_OPERS(server, FALSE, TRUE, SILC_NOTIFY_TYPE_NONE,
3216                              ("Server %s signoff", user_data->server_name));
3217
3218       if (!backup_router) {
3219         /* Remove all servers that are originated from this server, and
3220            remove the clients of those servers too. */
3221         silc_server_remove_servers_by_server(server, user_data, TRUE);
3222
3223 #if 0
3224         /* Remove the clients that this server owns as they will become
3225            invalid now too.  For backup router the server is actually
3226            coming from the primary router, so mark that as the owner
3227            of this entry. */
3228         if (server->server_type == SILC_BACKUP_ROUTER &&
3229             sock->type == SILC_SOCKET_TYPE_SERVER)
3230           silc_server_remove_clients_by_server(server, server->router,
3231                                                user_data, TRUE);
3232         else
3233 #endif
3234           silc_server_remove_clients_by_server(server, user_data,
3235                                                user_data, TRUE);
3236
3237         /* Remove channels owned by this server */
3238         if (server->server_type == SILC_SERVER)
3239           silc_server_remove_channels_by_server(server, user_data);
3240       } else {
3241         /* Enable local server connections that may be disabled */
3242         silc_server_local_servers_toggle_enabled(server, TRUE);
3243
3244         /* Update the client entries of this server to the new backup
3245            router.  If we are the backup router we also resolve the real
3246            servers for the clients.  After updating is over this also
3247            removes the clients that this server explicitly owns. */
3248         silc_server_update_clients_by_server(server, user_data,
3249                                              backup_router, TRUE);
3250
3251         /* If we are router and just lost our primary router (now standlaone)
3252            we remove everything that was behind it, since we don't know
3253            any better. */
3254         if (server->server_type == SILC_ROUTER && server->standalone)
3255           /* Remove all servers that are originated from this server, and
3256              remove the clients of those servers too. */
3257           silc_server_remove_servers_by_server(server, user_data, TRUE);
3258
3259         /* Finally remove the clients that are explicitly owned by this
3260            server.  They go down with the server. */
3261         silc_server_remove_clients_by_server(server, user_data,
3262                                              user_data, TRUE);
3263
3264         /* Update our server cache to use the new backup router too. */
3265         silc_server_update_servers_by_server(server, user_data, backup_router);
3266         if (server->server_type == SILC_SERVER)
3267           silc_server_update_channels_by_server(server, user_data,
3268                                                 backup_router);
3269
3270         /* Send notify about primary router going down to local operators */
3271         if (server->backup_router)
3272           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3273                                  SILC_NOTIFY_TYPE_NONE,
3274                                  ("%s switched to backup router %s "
3275                                   "(we are primary router now)",
3276                                   server->server_name, server->server_name));
3277         else if (server->router)
3278           SILC_SERVER_SEND_OPERS(server, FALSE, TRUE,
3279                                  SILC_NOTIFY_TYPE_NONE,
3280                                  ("%s switched to backup router %s",
3281                                   server->server_name,
3282                                   server->router->server_name));
3283       }
3284       server->backup_noswitch = FALSE;
3285
3286       /* Free the server entry */
3287       silc_server_backup_del(server, user_data);
3288       silc_server_backup_replaced_del(server, user_data);
3289       silc_idlist_del_data(user_data);
3290       if (!silc_idlist_del_server(server->local_list, user_data))
3291         silc_idlist_del_server(server->global_list, user_data);
3292       if (sock->type == SILC_SOCKET_TYPE_SERVER) {
3293         server->stat.my_servers--;
3294       } else {
3295         server->stat.my_routers--;
3296         server->stat.routers--;
3297       }
3298       server->stat.servers--;
3299       if (server->server_type == SILC_ROUTER)
3300         server->stat.cell_servers--;
3301
3302       if (backup_router && backup_router != server->id_entry) {
3303         /* Announce all of our stuff that was created about 5 minutes ago.
3304            The backup router knows all the other stuff already. */
3305         if (server->server_type == SILC_ROUTER)
3306           silc_server_announce_servers(server, FALSE, time(0) - 300,
3307                                        backup_router->connection);
3308
3309         /* Announce our clients and channels to the router */
3310         silc_server_announce_clients(server, time(0) - 300,
3311                                      backup_router->connection);
3312         silc_server_announce_channels(server, time(0) - 300,
3313                                       backup_router->connection);
3314       }
3315       break;
3316     }
3317   default:
3318     {
3319       SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
3320
3321       SILC_LOG_DEBUG(("Freeing unknown connection data"));
3322
3323       silc_idlist_del_data(user_data);
3324       silc_free(user_data);
3325       break;
3326     }
3327   }
3328
3329   /* If any protocol is active cancel its execution */
3330   if (sock->protocol && sock->protocol->protocol &&
3331       sock->protocol->protocol->type != SILC_PROTOCOL_SERVER_BACKUP) {
3332     SILC_LOG_DEBUG(("Cancelling protocol, calling final callback"));
3333     silc_protocol_cancel(sock->protocol, server->schedule);
3334     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3335     silc_protocol_execute_final(sock->protocol, server->schedule);
3336     sock->protocol = NULL;
3337   }
3338
3339   sock->user_data = NULL;
3340 }
3341
3342 /* Removes client from all channels it has joined. This is used when client
3343    connection is disconnected. If the client on a channel is last, the
3344    channel is removed as well. This sends the SIGNOFF notify types. */
3345
3346 void silc_server_remove_from_channels(SilcServer server,
3347                                       SilcSocketConnection sock,
3348                                       SilcClientEntry client,
3349                                       bool notify,
3350                                       const char *signoff_message,
3351                                       bool keygen,
3352                                       bool killed)
3353 {
3354   SilcChannelEntry channel;
3355   SilcChannelClientEntry chl;
3356   SilcHashTableList htl;
3357   SilcBuffer clidp = NULL;
3358
3359   if (!client)
3360     return;
3361
3362   SILC_LOG_DEBUG(("Removing client from joined channels"));
3363
3364   if (notify && !client->id)
3365     notify = FALSE;
3366
3367   if (notify) {
3368     clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3369     if (!clidp)
3370       notify = FALSE;
3371   }
3372
3373   /* Remove the client from all channels. The client is removed from
3374      the channels' user list. */
3375   silc_hash_table_list(client->channels, &htl);
3376   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3377     channel = chl->channel;
3378
3379     /* Remove channel if this is last client leaving the channel, unless
3380        the channel is permanent. */
3381     if (server->server_type != SILC_SERVER &&
3382         silc_hash_table_count(channel->user_list) < 2) {
3383       silc_server_channel_delete(server, channel);
3384       continue;
3385     }
3386
3387     silc_hash_table_del(client->channels, channel);
3388     silc_hash_table_del(channel->user_list, client);
3389     channel->user_count--;
3390
3391     /* If there is no global users on the channel anymore mark the channel
3392        as local channel. Do not check if the removed client is local client. */
3393     if (server->server_type == SILC_SERVER && channel->global_users &&
3394         chl->client->router && !silc_server_channel_has_global(channel))
3395       channel->global_users = FALSE;
3396
3397     memset(chl, 'A', sizeof(*chl));
3398     silc_free(chl);
3399
3400     /* Update statistics */
3401     if (SILC_IS_LOCAL(client))
3402       server->stat.my_chanclients--;
3403     if (server->server_type == SILC_ROUTER) {
3404       server->stat.cell_chanclients--;
3405       server->stat.chanclients--;
3406     }
3407
3408     /* If there is not at least one local user on the channel then we don't
3409        need the channel entry anymore, we can remove it safely, unless the
3410        channel is permanent channel */
3411     if (server->server_type == SILC_SERVER &&
3412         !silc_server_channel_has_local(channel)) {
3413       /* Notify about leaving client if this channel has global users. */
3414       if (notify && channel->global_users)
3415         silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3416                                            SILC_NOTIFY_TYPE_SIGNOFF,
3417                                            signoff_message ? 2 : 1,
3418                                            clidp->data, clidp->len,
3419                                            signoff_message, signoff_message ?
3420                                            strlen(signoff_message) : 0);
3421
3422       silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3423       silc_server_channel_delete(server, channel);
3424       continue;
3425     }
3426
3427     /* Send notify to channel about client leaving SILC and channel too */
3428     if (notify)
3429       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3430                                          SILC_NOTIFY_TYPE_SIGNOFF,
3431                                          signoff_message ? 2 : 1,
3432                                          clidp->data, clidp->len,
3433                                          signoff_message, signoff_message ?
3434                                          strlen(signoff_message) : 0);
3435
3436     if (killed && clidp) {
3437       /* Remove the client from channel's invite list */
3438       if (channel->invite_list &&
3439           silc_hash_table_count(channel->invite_list)) {
3440         SilcBuffer ab;
3441         SilcArgumentPayload iargs;
3442         ab = silc_argument_payload_encode_one(NULL, clidp->data,
3443                                               clidp->len, 3);
3444         iargs = silc_argument_payload_parse(ab->data, ab->len, 1);
3445         silc_server_inviteban_process(server, channel->invite_list, 1, iargs);
3446         silc_buffer_free(ab);
3447         silc_argument_payload_free(iargs);
3448       }
3449     }
3450
3451     /* Don't create keys if we are shutting down */
3452     if (server->server_shutdown)
3453       continue;
3454
3455     /* Re-generate channel key if needed */
3456     if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
3457       if (!silc_server_create_channel_key(server, channel, 0))
3458         continue;
3459
3460       /* Send the channel key to the channel. The key of course is not sent
3461          to the client who was removed from the channel. */
3462       silc_server_send_channel_key(server, client->connection, channel,
3463                                    server->server_type == SILC_ROUTER ?
3464                                    FALSE : !server->standalone);
3465     }
3466   }
3467
3468   silc_hash_table_list_reset(&htl);
3469   if (clidp)
3470     silc_buffer_free(clidp);
3471 }
3472
3473 /* Removes client from one channel. This is used for example when client
3474    calls LEAVE command to remove itself from the channel. Returns TRUE
3475    if channel still exists and FALSE if the channel is removed when
3476    last client leaves the channel. If `notify' is FALSE notify messages
3477    are not sent. */
3478
3479 bool silc_server_remove_from_one_channel(SilcServer server,
3480                                          SilcSocketConnection sock,
3481                                          SilcChannelEntry channel,
3482                                          SilcClientEntry client,
3483                                          bool notify)
3484 {
3485   SilcChannelClientEntry chl;
3486   SilcBuffer clidp;
3487
3488   SILC_LOG_DEBUG(("Removing %s from channel %s",
3489                   silc_id_render(client->id, SILC_ID_CLIENT),
3490                   channel->channel_name));
3491
3492   /* Get the entry to the channel, if this client is not on the channel
3493      then return Ok. */
3494   if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
3495     return TRUE;
3496
3497   /* Remove channel if this is last client leaving the channel, unless
3498      the channel is permanent. */
3499   if (server->server_type != SILC_SERVER &&
3500       silc_hash_table_count(channel->user_list) < 2) {
3501     silc_server_channel_delete(server, channel);
3502     return FALSE;
3503   }
3504
3505   silc_hash_table_del(client->channels, channel);
3506   silc_hash_table_del(channel->user_list, client);
3507   channel->user_count--;
3508
3509   /* If there is no global users on the channel anymore mark the channel
3510      as local channel. Do not check if the client is local client. */
3511   if (server->server_type == SILC_SERVER && channel->global_users &&
3512       chl->client->router && !silc_server_channel_has_global(channel))
3513     channel->global_users = FALSE;
3514
3515   memset(chl, 'O', sizeof(*chl));
3516   silc_free(chl);
3517
3518   /* Update statistics */
3519   if (SILC_IS_LOCAL(client))
3520     server->stat.my_chanclients--;
3521   if (server->server_type == SILC_ROUTER) {
3522     server->stat.cell_chanclients--;
3523     server->stat.chanclients--;
3524   }
3525
3526   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3527   if (!clidp)
3528     notify = FALSE;
3529
3530   /* If there is not at least one local user on the channel then we don't
3531      need the channel entry anymore, we can remove it safely, unless the
3532      channel is permanent channel */
3533   if (server->server_type == SILC_SERVER &&
3534       !silc_server_channel_has_local(channel)) {
3535     /* Notify about leaving client if this channel has global users. */
3536     if (notify && channel->global_users)
3537       silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3538                                          SILC_NOTIFY_TYPE_LEAVE, 1,
3539                                          clidp->data, clidp->len);
3540
3541     silc_schedule_task_del_by_context(server->schedule, channel->rekey);
3542     silc_server_channel_delete(server, channel);
3543     silc_buffer_free(clidp);
3544     return FALSE;
3545   }
3546
3547   /* Send notify to channel about client leaving the channel */
3548   if (notify)
3549     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3550                                        SILC_NOTIFY_TYPE_LEAVE, 1,
3551                                        clidp->data, clidp->len);
3552
3553   silc_buffer_free(clidp);
3554   return TRUE;
3555 }
3556
3557 /* Timeout callback. This is called if connection is idle or for some
3558    other reason is not responding within some period of time. This
3559    disconnects the remote end. */
3560
3561 SILC_TASK_CALLBACK(silc_server_timeout_remote)
3562 {
3563   SilcServer server = (SilcServer)context;
3564   SilcSocketConnection sock = server->sockets[fd];
3565   SilcProtocolType protocol = 0;
3566
3567   SILC_LOG_DEBUG(("Start"));
3568
3569   if (!sock)
3570     return;
3571
3572   SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
3573                   sock->hostname, sock->ip));
3574
3575   /* If we have protocol active we must assure that we call the protocol's
3576      final callback so that all the memory is freed. */
3577   if (sock->protocol && sock->protocol->protocol &&
3578       sock->protocol->protocol->type != SILC_PROTOCOL_SERVER_BACKUP) {
3579     protocol = sock->protocol->protocol->type;
3580     silc_protocol_cancel(sock->protocol, server->schedule);
3581     sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
3582     silc_protocol_execute_final(sock->protocol, server->schedule);
3583     sock->protocol = NULL;
3584     return;
3585   }
3586
3587   silc_server_disconnect_remote(server, sock,
3588                                 protocol ==
3589                                 SILC_PROTOCOL_SERVER_CONNECTION_AUTH ?
3590                                 SILC_STATUS_ERR_AUTH_FAILED :
3591                                 SILC_STATUS_ERR_KEY_EXCHANGE_FAILED,
3592                                 "Connection timeout");
3593
3594   if (sock->user_data)
3595     silc_server_free_sock_user_data(server, sock, NULL);
3596 }
3597
3598 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
3599    function may be used only by router. In real SILC network all channels
3600    are created by routers thus this function is never used by normal
3601    server. */
3602
3603 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
3604                                                 SilcServerID *router_id,
3605                                                 char *cipher,
3606                                                 char *hmac,
3607                                                 char *channel_name,
3608                                                 int broadcast)
3609 {
3610   SilcChannelID *channel_id;
3611   SilcChannelEntry entry;
3612   SilcCipher key;
3613   SilcHmac newhmac;
3614
3615   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3616
3617   if (!cipher)
3618     cipher = SILC_DEFAULT_CIPHER;
3619   if (!hmac)
3620     hmac = SILC_DEFAULT_HMAC;
3621
3622   /* Allocate cipher */
3623   if (!silc_cipher_alloc(cipher, &key))
3624     return NULL;
3625
3626   /* Allocate hmac */
3627   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3628     silc_cipher_free(key);
3629     return NULL;
3630   }
3631
3632   channel_name = strdup(channel_name);
3633
3634   /* Create the channel ID */
3635   if (!silc_id_create_channel_id(server, router_id, server->rng,
3636                                  &channel_id)) {
3637     silc_free(channel_name);
3638     silc_cipher_free(key);
3639     silc_hmac_free(newhmac);
3640     return NULL;
3641   }
3642
3643   /* Create the channel */
3644   entry = silc_idlist_add_channel(server->local_list, channel_name,
3645                                   SILC_CHANNEL_MODE_NONE, channel_id,
3646                                   NULL, key, newhmac, 0);
3647   if (!entry) {
3648     silc_free(channel_name);
3649     silc_cipher_free(key);
3650     silc_hmac_free(newhmac);
3651     silc_free(channel_id);
3652     return NULL;
3653   }
3654
3655   entry->cipher = strdup(cipher);
3656   entry->hmac_name = strdup(hmac);
3657
3658   /* Now create the actual key material */
3659   if (!silc_server_create_channel_key(server, entry,
3660                                       silc_cipher_get_key_len(key) / 8)) {
3661     silc_idlist_del_channel(server->local_list, entry);
3662     return NULL;
3663   }
3664
3665   /* Notify other routers about the new channel. We send the packet
3666      to our primary route. */
3667   if (broadcast)
3668     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3669                                  channel_name, entry->id,
3670                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3671                                  entry->mode);
3672
3673   /* Distribute to backup routers */
3674   if (broadcast && server->server_type == SILC_ROUTER) {
3675     SilcBuffer packet;
3676     unsigned char *cid;
3677     SilcUInt32 name_len = strlen(channel_name);
3678     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3679     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3680
3681     packet = silc_channel_payload_encode(channel_name, name_len,
3682                                          cid, channel_id_len, entry->mode);
3683     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3684                             packet->data, packet->len, FALSE, TRUE);
3685     silc_free(cid);
3686     silc_buffer_free(packet);
3687   }
3688
3689   server->stat.my_channels++;
3690   if (server->server_type == SILC_ROUTER) {
3691     server->stat.channels++;
3692     server->stat.cell_channels++;
3693     entry->users_resolved = TRUE;
3694   }
3695
3696   return entry;
3697 }
3698
3699 /* Same as above but creates the channel with Channel ID `channel_id. */
3700
3701 SilcChannelEntry
3702 silc_server_create_new_channel_with_id(SilcServer server,
3703                                        char *cipher,
3704                                        char *hmac,
3705                                        char *channel_name,
3706                                        SilcChannelID *channel_id,
3707                                        int broadcast)
3708 {
3709   SilcChannelEntry entry;
3710   SilcCipher key;
3711   SilcHmac newhmac;
3712
3713   SILC_LOG_DEBUG(("Creating new channel %s", channel_name));
3714
3715   if (!cipher)
3716     cipher = SILC_DEFAULT_CIPHER;
3717   if (!hmac)
3718     hmac = SILC_DEFAULT_HMAC;
3719
3720   /* Allocate cipher */
3721   if (!silc_cipher_alloc(cipher, &key))
3722     return NULL;
3723
3724   /* Allocate hmac */
3725   if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3726     silc_cipher_free(key);
3727     return NULL;
3728   }
3729
3730   channel_name = strdup(channel_name);
3731
3732   /* Create the channel */
3733   entry = silc_idlist_add_channel(server->local_list, channel_name,
3734                                   SILC_CHANNEL_MODE_NONE, channel_id,
3735                                   NULL, key, newhmac, 0);
3736   if (!entry) {
3737     silc_cipher_free(key);
3738     silc_hmac_free(newhmac);
3739     silc_free(channel_name);
3740     return NULL;
3741   }
3742
3743   /* Now create the actual key material */
3744   if (!silc_server_create_channel_key(server, entry,
3745                                       silc_cipher_get_key_len(key) / 8)) {
3746     silc_idlist_del_channel(server->local_list, entry);
3747     return NULL;
3748   }
3749
3750   /* Notify other routers about the new channel. We send the packet
3751      to our primary route. */
3752   if (broadcast)
3753     silc_server_send_new_channel(server, SILC_PRIMARY_ROUTE(server), TRUE,
3754                                  channel_name, entry->id,
3755                                  silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3756                                  entry->mode);
3757
3758   /* Distribute to backup routers */
3759   if (broadcast && server->server_type == SILC_ROUTER) {
3760     SilcBuffer packet;
3761     unsigned char *cid;
3762     SilcUInt32 name_len = strlen(channel_name);
3763     SilcUInt32 channel_id_len = silc_id_get_len(entry->id, SILC_ID_CHANNEL);
3764     cid = silc_id_id2str(entry->id, SILC_ID_CHANNEL);
3765
3766     packet = silc_channel_payload_encode(channel_name, name_len,
3767                                          cid, channel_id_len, entry->mode);
3768     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
3769                             packet->data, packet->len, FALSE, TRUE);
3770     silc_free(cid);
3771     silc_buffer_free(packet);
3772   }
3773
3774   server->stat.my_channels++;
3775   if (server->server_type == SILC_ROUTER) {
3776     server->stat.channels++;
3777     server->stat.cell_channels++;
3778     entry->users_resolved = TRUE;
3779   }
3780
3781   return entry;
3782 }
3783
3784 /* Channel's key re-key timeout callback. */
3785
3786 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3787 {
3788   SilcServer server = app_context;
3789   SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3790
3791   rekey->task = NULL;
3792
3793   /* Return now if we are shutting down */
3794   if (server->server_shutdown)
3795     return;
3796
3797   if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3798     return;
3799
3800   silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3801 }
3802
3803 /* Generates new channel key. This is used to create the initial channel key
3804    but also to re-generate new key for channel. If `key_len' is provided
3805    it is the bytes of the key length. */
3806
3807 bool silc_server_create_channel_key(SilcServer server,
3808                                     SilcChannelEntry channel,
3809                                     SilcUInt32 key_len)
3810 {
3811   int i;
3812   unsigned char channel_key[32], hash[32];
3813   SilcUInt32 len;
3814
3815   if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3816     SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3817     return TRUE;
3818   }
3819
3820   SILC_LOG_DEBUG(("Generating channel %s key", channel->channel_name));
3821
3822   if (!channel->channel_key)
3823     if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3824       channel->channel_key = NULL;
3825       return FALSE;
3826     }
3827
3828   if (key_len)
3829     len = key_len;
3830   else if (channel->key_len)
3831     len = channel->key_len / 8;
3832   else
3833     len = silc_cipher_get_key_len(channel->channel_key) / 8;
3834
3835   /* Create channel key */
3836   for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3837
3838   /* Set the key */
3839   silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3840
3841   /* Remove old key if exists */
3842   if (channel->key) {
3843     memset(channel->key, 0, channel->key_len / 8);
3844     silc_free(channel->key);
3845   }
3846
3847   /* Save the key */
3848   channel->key_len = len * 8;
3849   channel->key = silc_memdup(channel_key, len);
3850   memset(channel_key, 0, sizeof(channel_key));
3851
3852   /* Generate HMAC key from the channel key data and set it */
3853   if (!channel->hmac)
3854     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3855   silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3856   silc_hmac_set_key(channel->hmac, hash,
3857                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3858   memset(hash, 0, sizeof(hash));
3859
3860   if (server->server_type == SILC_ROUTER) {
3861     if (!channel->rekey)
3862       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3863     channel->rekey->channel = channel;
3864     channel->rekey->key_len = key_len;
3865     if (channel->rekey->task)
3866       silc_schedule_task_del(server->schedule, channel->rekey->task);
3867
3868     channel->rekey->task =
3869       silc_schedule_task_add(server->schedule, 0,
3870                              silc_server_channel_key_rekey,
3871                              (void *)channel->rekey,
3872                              server->config->channel_rekey_secs, 0,
3873                              SILC_TASK_TIMEOUT,
3874                              SILC_TASK_PRI_NORMAL);
3875   }
3876
3877   return TRUE;
3878 }
3879
3880 /* Saves the channel key found in the encoded `key_payload' buffer. This
3881    function is used when we receive Channel Key Payload and also when we're
3882    processing JOIN command reply. Returns entry to the channel. */
3883
3884 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3885                                               SilcBuffer key_payload,
3886                                               SilcChannelEntry channel)
3887 {
3888   SilcChannelKeyPayload payload = NULL;
3889   SilcChannelID *id = NULL;
3890   unsigned char *tmp, hash[32];
3891   SilcUInt32 tmp_len;
3892   char *cipher;
3893
3894   /* Decode channel key payload */
3895   payload = silc_channel_key_payload_parse(key_payload->data,
3896                                            key_payload->len);
3897   if (!payload) {
3898     SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3899     channel = NULL;
3900     goto out;
3901   }
3902
3903   /* Get the channel entry */
3904   if (!channel) {
3905
3906     /* Get channel ID */
3907     tmp = silc_channel_key_get_id(payload, &tmp_len);
3908     id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3909     if (!id) {
3910       channel = NULL;
3911       goto out;
3912     }
3913
3914     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3915     if (!channel) {
3916       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3917       if (!channel) {
3918         if (server->server_type == SILC_ROUTER)
3919           SILC_LOG_ERROR(("Received key for non-existent channel %s",
3920                           silc_id_render(id, SILC_ID_CHANNEL)));
3921         goto out;
3922       }
3923     }
3924   }
3925
3926   SILC_LOG_DEBUG(("Saving new channel %s key", channel->channel_name));
3927
3928   tmp = silc_channel_key_get_key(payload, &tmp_len);
3929   if (!tmp) {
3930     channel = NULL;
3931     goto out;
3932   }
3933
3934   cipher = silc_channel_key_get_cipher(payload, NULL);
3935   if (!cipher) {
3936     channel = NULL;
3937     goto out;
3938   }
3939
3940   /* Remove old key if exists */
3941   if (channel->key) {
3942     memset(channel->key, 0, channel->key_len / 8);
3943     silc_free(channel->key);
3944     silc_cipher_free(channel->channel_key);
3945   }
3946
3947   /* Create new cipher */
3948   if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3949     channel->channel_key = NULL;
3950     channel = NULL;
3951     goto out;
3952   }
3953
3954   if (channel->cipher)
3955     silc_free(channel->cipher);
3956   channel->cipher = strdup(cipher);
3957
3958   /* Save the key */
3959   channel->key_len = tmp_len * 8;
3960   channel->key = silc_memdup(tmp, tmp_len);
3961   silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3962
3963   /* Generate HMAC key from the channel key data and set it */
3964   if (!channel->hmac)
3965     silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3966   silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3967   silc_hmac_set_key(channel->hmac, hash,
3968                     silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3969
3970   memset(hash, 0, sizeof(hash));
3971   memset(tmp, 0, tmp_len);
3972
3973   if (server->server_type == SILC_ROUTER) {
3974     if (!channel->rekey)
3975       channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3976     channel->rekey->channel = channel;
3977     if (channel->rekey->task)
3978       silc_schedule_task_del(server->schedule, channel->rekey->task);
3979
3980     channel->rekey->task =
3981       silc_schedule_task_add(server->schedule, 0,
3982                              silc_server_channel_key_rekey,
3983                              (void *)channel->rekey,
3984                              server->config->channel_rekey_secs, 0,
3985                              SILC_TASK_TIMEOUT,
3986                              SILC_TASK_PRI_NORMAL);
3987   }
3988
3989  out:
3990   silc_free(id);
3991   if (payload)
3992     silc_channel_key_payload_free(payload);
3993
3994   return channel;
3995 }
3996
3997 /* Heartbeat callback. This function is set as argument for the
3998    silc_socket_set_heartbeat function. The library will call this function
3999    at the set time interval. */
4000
4001 void silc_server_perform_heartbeat(SilcSocketConnection sock,
4002                                    void *hb_context)
4003 {
4004   SilcServer server = hb_context;
4005
4006   SILC_LOG_DEBUG(("Sending heartbeat to %s:%d (%s)", sock->hostname,
4007                  sock->port, sock->ip));
4008
4009   /* Send the heartbeat */
4010   silc_server_send_heartbeat(server, sock);
4011 }
4012
4013 /* Returns assembled of all servers in the given ID list. The packet's
4014    form is dictated by the New ID payload. */
4015
4016 static void silc_server_announce_get_servers(SilcServer server,
4017                                              SilcServerEntry remote,
4018                                              SilcIDList id_list,
4019                                              SilcBuffer *servers,
4020                                              unsigned long creation_time)
4021 {
4022   SilcIDCacheList list;
4023   SilcIDCacheEntry id_cache;
4024   SilcServerEntry entry;
4025   SilcBuffer idp;
4026
4027   /* Go through all clients in the list */
4028   if (silc_idcache_get_all(id_list->servers, &list)) {
4029     if (silc_idcache_list_first(list, &id_cache)) {
4030       while (id_cache) {
4031         entry = (SilcServerEntry)id_cache->context;
4032
4033         /* Do not announce the one we've sending our announcements and
4034            do not announce ourself. Also check the creation time if it's
4035            provided. */
4036         if ((entry == remote) || (entry == server->id_entry) ||
4037             (creation_time && entry->data.created < creation_time)) {
4038           if (!silc_idcache_list_next(list, &id_cache))
4039             break;
4040           continue;
4041         }
4042
4043         idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
4044
4045         *servers = silc_buffer_realloc(*servers,
4046                                        (*servers ?
4047                                         (*servers)->truelen + idp->len :
4048                                         idp->len));
4049         silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
4050         silc_buffer_put(*servers, idp->data, idp->len);
4051         silc_buffer_pull(*servers, idp->len);
4052         silc_buffer_free(idp);
4053
4054         if (!silc_idcache_list_next(list, &id_cache))
4055           break;
4056       }
4057     }
4058
4059     silc_idcache_list_free(list);
4060   }
4061 }
4062
4063 static SilcBuffer
4064 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
4065 {
4066   va_list ap;
4067   SilcBuffer p;
4068
4069   va_start(ap, argc);
4070   p = silc_notify_payload_encode(notify, argc, ap);
4071   va_end(ap);
4072
4073   return p;
4074 }
4075
4076 /* This function is used by router to announce existing servers to our
4077    primary router when we've connected to it. If `creation_time' is non-zero
4078    then only the servers that has been created after the `creation_time'
4079    will be announced. */
4080
4081 void silc_server_announce_servers(SilcServer server, bool global,
4082                                   unsigned long creation_time,
4083                                   SilcSocketConnection remote)
4084 {
4085   SilcBuffer servers = NULL;
4086
4087   SILC_LOG_DEBUG(("Announcing servers"));
4088
4089   /* Get servers in local list */
4090   silc_server_announce_get_servers(server, remote->user_data,
4091                                    server->local_list, &servers,
4092                                    creation_time);
4093
4094   if (global)
4095     /* Get servers in global list */
4096     silc_server_announce_get_servers(server, remote->user_data,
4097                                      server->global_list, &servers,
4098                                      creation_time);
4099
4100   if (servers) {
4101     silc_buffer_push(servers, servers->data - servers->head);
4102     SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
4103
4104     /* Send the packet */
4105     silc_server_packet_send(server, remote,
4106                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4107                             servers->data, servers->len, TRUE);
4108
4109     silc_buffer_free(servers);
4110   }
4111 }
4112
4113 /* Returns assembled packet of all clients in the given ID list. The
4114    packet's form is dictated by the New ID Payload. */
4115
4116 static void silc_server_announce_get_clients(SilcServer server,
4117                                              SilcIDList id_list,
4118                                              SilcBuffer *clients,
4119                                              SilcBuffer *umodes,
4120                                              unsigned long creation_time)
4121 {
4122   SilcIDCacheList list;
4123   SilcIDCacheEntry id_cache;
4124   SilcClientEntry client;
4125   SilcBuffer idp;
4126   SilcBuffer tmp;
4127   unsigned char mode[4];
4128
4129   /* Go through all clients in the list */
4130   if (silc_idcache_get_all(id_list->clients, &list)) {
4131     if (silc_idcache_list_first(list, &id_cache)) {
4132       while (id_cache) {
4133         client = (SilcClientEntry)id_cache->context;
4134
4135         if (creation_time && client->data.created < creation_time) {
4136           if (!silc_idcache_list_next(list, &id_cache))
4137             break;
4138           continue;
4139         }
4140         if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED) &&
4141             !client->connection && !client->router && !SILC_IS_LOCAL(client)) {
4142           if (!silc_idcache_list_next(list, &id_cache))
4143             break;
4144           continue;
4145         }
4146
4147         idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4148
4149         *clients = silc_buffer_realloc(*clients,
4150                                        (*clients ?
4151                                         (*clients)->truelen + idp->len :
4152                                         idp->len));
4153         silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
4154         silc_buffer_put(*clients, idp->data, idp->len);
4155         silc_buffer_pull(*clients, idp->len);
4156
4157         SILC_PUT32_MSB(client->mode, mode);
4158         tmp =
4159           silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
4160                                              2, idp->data, idp->len,
4161                                              mode, 4);
4162         *umodes = silc_buffer_realloc(*umodes,
4163                                       (*umodes ?
4164                                        (*umodes)->truelen + tmp->len :
4165                                        tmp->len));
4166         silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
4167         silc_buffer_put(*umodes, tmp->data, tmp->len);
4168         silc_buffer_pull(*umodes, tmp->len);
4169         silc_buffer_free(tmp);
4170
4171         silc_buffer_free(idp);
4172
4173         if (!silc_idcache_list_next(list, &id_cache))
4174           break;
4175       }
4176     }
4177
4178     silc_idcache_list_free(list);
4179   }
4180 }
4181
4182 /* This function is used to announce our existing clients to our router
4183    when we've connected to it. If `creation_time' is non-zero then only
4184    the clients that has been created after the `creation_time' will be
4185    announced. */
4186
4187 void silc_server_announce_clients(SilcServer server,
4188                                   unsigned long creation_time,
4189                                   SilcSocketConnection remote)
4190 {
4191   SilcBuffer clients = NULL;
4192   SilcBuffer umodes = NULL;
4193
4194   SILC_LOG_DEBUG(("Announcing clients"));
4195
4196   /* Get clients in local list */
4197   silc_server_announce_get_clients(server, server->local_list,
4198                                    &clients, &umodes, creation_time);
4199
4200   /* As router we announce our global list as well */
4201   if (server->server_type == SILC_ROUTER)
4202     silc_server_announce_get_clients(server, server->global_list,
4203                                      &clients, &umodes, creation_time);
4204
4205   if (clients) {
4206     silc_buffer_push(clients, clients->data - clients->head);
4207     SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
4208
4209     /* Send the packet */
4210     silc_server_packet_send(server, remote,
4211                             SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
4212                             clients->data, clients->len, TRUE);
4213
4214     silc_buffer_free(clients);
4215   }
4216
4217   if (umodes) {
4218     silc_buffer_push(umodes, umodes->data - umodes->head);
4219     SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
4220
4221     /* Send the packet */
4222     silc_server_packet_send(server, remote,
4223                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4224                             umodes->data, umodes->len, TRUE);
4225
4226     silc_buffer_free(umodes);
4227   }
4228 }
4229
4230 /* Returns channel's topic for announcing it */
4231
4232 void silc_server_announce_get_channel_topic(SilcServer server,
4233                                             SilcChannelEntry channel,
4234                                             SilcBuffer *topic)
4235 {
4236   SilcBuffer chidp;
4237
4238   if (channel->topic) {
4239     chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4240     *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
4241                                                 chidp->data, chidp->len,
4242                                                 channel->topic,
4243                                                 strlen(channel->topic));
4244     silc_buffer_free(chidp);
4245   }
4246 }
4247
4248 /* Returns assembled packets for channel users of the `channel'. */
4249
4250 void silc_server_announce_get_channel_users(SilcServer server,
4251                                             SilcChannelEntry channel,
4252                                             SilcBuffer *channel_modes,
4253                                             SilcBuffer *channel_users,
4254                                             SilcBuffer *channel_users_modes)
4255 {
4256   SilcChannelClientEntry chl;
4257   SilcHashTableList htl;
4258   SilcBuffer chidp, clidp, csidp;
4259   SilcBuffer tmp, fkey = NULL;
4260   int len;
4261   unsigned char mode[4];
4262   char *hmac;
4263
4264   SILC_LOG_DEBUG(("Start"));
4265
4266   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4267   csidp = silc_id_payload_encode(server->id, SILC_ID_SERVER);
4268
4269   /* CMODE notify */
4270   SILC_PUT32_MSB(channel->mode, mode);
4271   hmac = channel->hmac ? (char *)silc_hmac_get_name(channel->hmac) : NULL;
4272   if (channel->founder_key)
4273     fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4274   tmp =
4275     silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CMODE_CHANGE,
4276                                        6, csidp->data, csidp->len,
4277                                        mode, sizeof(mode),
4278                                        NULL, 0,
4279                                        hmac, hmac ? strlen(hmac) : 0,
4280                                        channel->passphrase,
4281                                        channel->passphrase ?
4282                                        strlen(channel->passphrase) : 0,
4283                                        fkey ? fkey->data : NULL,
4284                                        fkey ? fkey->len : 0);
4285   len = tmp->len;
4286   *channel_modes =
4287     silc_buffer_realloc(*channel_modes,
4288                         (*channel_modes ?
4289                          (*channel_modes)->truelen + len : len));
4290   silc_buffer_pull_tail(*channel_modes,
4291                         ((*channel_modes)->end -
4292                          (*channel_modes)->data));
4293   silc_buffer_put(*channel_modes, tmp->data, tmp->len);
4294   silc_buffer_pull(*channel_modes, len);
4295   silc_buffer_free(tmp);
4296   silc_buffer_free(fkey);
4297   fkey = NULL;
4298
4299   /* Now find all users on the channel */
4300   silc_hash_table_list(channel->user_list, &htl);
4301   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4302     clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4303
4304     /* JOIN Notify */
4305     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
4306                                              clidp->data, clidp->len,
4307                                              chidp->data, chidp->len);
4308     len = tmp->len;
4309     *channel_users =
4310       silc_buffer_realloc(*channel_users,
4311                           (*channel_users ?
4312                            (*channel_users)->truelen + len : len));
4313     silc_buffer_pull_tail(*channel_users,
4314                           ((*channel_users)->end -
4315                            (*channel_users)->data));
4316
4317     silc_buffer_put(*channel_users, tmp->data, tmp->len);
4318     silc_buffer_pull(*channel_users, len);
4319     silc_buffer_free(tmp);
4320
4321     /* CUMODE notify for mode change on the channel */
4322     SILC_PUT32_MSB(chl->mode, mode);
4323     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && channel->founder_key)
4324       fkey = silc_pkcs_public_key_payload_encode(channel->founder_key);
4325     tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
4326                                              4, csidp->data, csidp->len,
4327                                              mode, sizeof(mode),
4328                                              clidp->data, clidp->len,
4329                                              fkey ? fkey->data : NULL,
4330                                              fkey ? fkey->len : 0);
4331     len = tmp->len;
4332     *channel_users_modes =
4333       silc_buffer_realloc(*channel_users_modes,
4334                           (*channel_users_modes ?
4335                            (*channel_users_modes)->truelen + len : len));
4336     silc_buffer_pull_tail(*channel_users_modes,
4337                           ((*channel_users_modes)->end -
4338                            (*channel_users_modes)->data));
4339
4340     silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
4341     silc_buffer_pull(*channel_users_modes, len);
4342     silc_buffer_free(tmp);
4343     silc_buffer_free(fkey);
4344     fkey = NULL;
4345     silc_buffer_free(clidp);
4346   }
4347   silc_hash_table_list_reset(&htl);
4348   silc_buffer_free(chidp);
4349   silc_buffer_free(csidp);
4350 }
4351
4352 /* Returns assembled packets for all channels and users on those channels
4353    from the given ID List. The packets are in the form dictated by the
4354    New Channel and New Channel User payloads. */
4355
4356 void silc_server_announce_get_channels(SilcServer server,
4357                                        SilcIDList id_list,
4358                                        SilcBuffer *channels,
4359                                        SilcBuffer **channel_modes,
4360                                        SilcBuffer *channel_users,
4361                                        SilcBuffer **channel_users_modes,
4362                                        SilcUInt32 *channel_users_modes_c,
4363                                        SilcBuffer **channel_topics,
4364                                        SilcChannelID ***channel_ids,
4365                                        unsigned long creation_time)
4366 {
4367   SilcIDCacheList list;
4368   SilcIDCacheEntry id_cache;
4369   SilcChannelEntry channel;
4370   unsigned char *cid;
4371   SilcUInt32 id_len;
4372   SilcUInt16 name_len;
4373   int len;
4374   int i = *channel_users_modes_c;
4375   bool announce;
4376
4377   SILC_LOG_DEBUG(("Start"));
4378
4379   /* Go through all channels in the list */
4380   if (silc_idcache_get_all(id_list->channels, &list)) {
4381     if (silc_idcache_list_first(list, &id_cache)) {
4382       while (id_cache) {
4383         channel = (SilcChannelEntry)id_cache->context;
4384
4385         if (creation_time && channel->created < creation_time)
4386           announce = FALSE;
4387         else
4388           announce = TRUE;
4389
4390         cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4391         id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4392         name_len = strlen(channel->channel_name);
4393
4394         if (announce) {
4395           len = 4 + name_len + id_len + 4;
4396           *channels =
4397             silc_buffer_realloc(*channels,
4398                                 (*channels ? (*channels)->truelen +
4399                                  len : len));
4400           silc_buffer_pull_tail(*channels,
4401                                 ((*channels)->end - (*channels)->data));
4402           silc_buffer_format(*channels,
4403                              SILC_STR_UI_SHORT(name_len),
4404                              SILC_STR_UI_XNSTRING(channel->channel_name,
4405                                                   name_len),
4406                              SILC_STR_UI_SHORT(id_len),
4407                              SILC_STR_UI_XNSTRING(cid, id_len),
4408                              SILC_STR_UI_INT(channel->mode),
4409                              SILC_STR_END);
4410           silc_buffer_pull(*channels, len);
4411         }
4412
4413         if (creation_time && channel->updated < creation_time)
4414           announce = FALSE;
4415         else
4416           announce = TRUE;
4417
4418         if (announce) {
4419           /* Channel user modes */
4420           *channel_users_modes = silc_realloc(*channel_users_modes,
4421                                               sizeof(**channel_users_modes) *
4422                                               (i + 1));
4423           (*channel_users_modes)[i] = NULL;
4424           *channel_modes = silc_realloc(*channel_modes,
4425                                         sizeof(**channel_modes) * (i + 1));
4426           (*channel_modes)[i] = NULL;
4427           *channel_ids = silc_realloc(*channel_ids,
4428                                       sizeof(**channel_ids) * (i + 1));
4429           (*channel_ids)[i] = NULL;
4430           silc_server_announce_get_channel_users(server, channel,
4431                                                  &(*channel_modes)[i],
4432                                                  channel_users,
4433                                                  &(*channel_users_modes)[i]);
4434           (*channel_ids)[i] = channel->id;
4435
4436           /* Channel's topic */
4437           *channel_topics = silc_realloc(*channel_topics,
4438                                          sizeof(**channel_topics) * (i + 1));
4439           (*channel_topics)[i] = NULL;
4440           silc_server_announce_get_channel_topic(server, channel,
4441                                                  &(*channel_topics)[i]);
4442           (*channel_users_modes_c)++;
4443
4444           silc_free(cid);
4445
4446           i++;
4447         }
4448
4449         if (!silc_idcache_list_next(list, &id_cache))
4450           break;
4451       }
4452     }
4453
4454     silc_idcache_list_free(list);
4455   }
4456 }
4457
4458 /* This function is used to announce our existing channels to our router
4459    when we've connected to it. This also announces the users on the
4460    channels to the router. If the `creation_time' is non-zero only the
4461    channels that was created after the `creation_time' are announced.
4462    Note that the channel users are still announced even if the `creation_time'
4463    was provided. */
4464
4465 void silc_server_announce_channels(SilcServer server,
4466                                    unsigned long creation_time,
4467                                    SilcSocketConnection remote)
4468 {
4469   SilcBuffer channels = NULL, *channel_modes = NULL, channel_users = NULL;
4470   SilcBuffer *channel_users_modes = NULL;
4471   SilcBuffer *channel_topics = NULL;
4472   SilcUInt32 channel_users_modes_c = 0;
4473   SilcChannelID **channel_ids = NULL;
4474
4475   SILC_LOG_DEBUG(("Announcing channels and channel users"));
4476
4477   /* Get channels and channel users in local list */
4478   silc_server_announce_get_channels(server, server->local_list,
4479                                     &channels, &channel_modes,
4480                                     &channel_users,
4481                                     &channel_users_modes,
4482                                     &channel_users_modes_c,
4483                                     &channel_topics,
4484                                     &channel_ids, creation_time);
4485
4486   /* Get channels and channel users in global list */
4487   if (server->server_type != SILC_SERVER)
4488     silc_server_announce_get_channels(server, server->global_list,
4489                                       &channels, &channel_modes,
4490                                       &channel_users,
4491                                       &channel_users_modes,
4492                                       &channel_users_modes_c,
4493                                       &channel_topics,
4494                                       &channel_ids, creation_time);
4495
4496   if (channels) {
4497     silc_buffer_push(channels, channels->data - channels->head);
4498     SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
4499
4500     /* Send the packet */
4501     silc_server_packet_send(server, remote,
4502                             SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
4503                             channels->data, channels->len,
4504                             FALSE);
4505
4506     silc_buffer_free(channels);
4507   }
4508
4509   if (channel_users) {
4510     silc_buffer_push(channel_users, channel_users->data - channel_users->head);
4511     SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
4512                      channel_users->len);
4513
4514     /* Send the packet */
4515     silc_server_packet_send(server, remote,
4516                             SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4517                             channel_users->data, channel_users->len,
4518                             FALSE);
4519
4520     silc_buffer_free(channel_users);
4521   }
4522
4523   if (channel_modes) {
4524     int i;
4525
4526     for (i = 0; i < channel_users_modes_c; i++) {
4527       if (!channel_modes[i])
4528         continue;
4529       silc_buffer_push(channel_modes[i],
4530                        channel_modes[i]->data -
4531                        channel_modes[i]->head);
4532       SILC_LOG_HEXDUMP(("channel modes"), channel_modes[i]->data,
4533                        channel_modes[i]->len);
4534       silc_server_packet_send_dest(server, remote,
4535                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4536                                    channel_ids[i], SILC_ID_CHANNEL,
4537                                    channel_modes[i]->data,
4538                                    channel_modes[i]->len,
4539                                    FALSE);
4540       silc_buffer_free(channel_modes[i]);
4541     }
4542     silc_free(channel_modes);
4543   }
4544
4545   if (channel_users_modes) {
4546     int i;
4547
4548     for (i = 0; i < channel_users_modes_c; i++) {
4549       if (!channel_users_modes[i])
4550         continue;
4551       silc_buffer_push(channel_users_modes[i],
4552                        channel_users_modes[i]->data -
4553                        channel_users_modes[i]->head);
4554       SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
4555                        channel_users_modes[i]->len);
4556       silc_server_packet_send_dest(server, remote,
4557                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4558                                    channel_ids[i], SILC_ID_CHANNEL,
4559                                    channel_users_modes[i]->data,
4560                                    channel_users_modes[i]->len,
4561                                    FALSE);
4562       silc_buffer_free(channel_users_modes[i]);
4563     }
4564     silc_free(channel_users_modes);
4565   }
4566
4567   if (channel_topics) {
4568     int i;
4569
4570     for (i = 0; i < channel_users_modes_c; i++) {
4571       if (!channel_topics[i])
4572         continue;
4573
4574       silc_buffer_push(channel_topics[i],
4575                        channel_topics[i]->data -
4576                        channel_topics[i]->head);
4577       SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
4578                        channel_topics[i]->len);
4579       silc_server_packet_send_dest(server, remote,
4580                                    SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
4581                                    channel_ids[i], SILC_ID_CHANNEL,
4582                                    channel_topics[i]->data,
4583                                    channel_topics[i]->len,
4584                                    FALSE);
4585       silc_buffer_free(channel_topics[i]);
4586     }
4587     silc_free(channel_topics);
4588   }
4589
4590   silc_free(channel_ids);
4591 }
4592
4593 /* Assembles user list and users mode list from the `channel'. */
4594
4595 bool silc_server_get_users_on_channel(SilcServer server,
4596                                       SilcChannelEntry channel,
4597                                       SilcBuffer *user_list,
4598                                       SilcBuffer *mode_list,
4599                                       SilcUInt32 *user_count)
4600 {
4601   SilcChannelClientEntry chl;
4602   SilcHashTableList htl;
4603   SilcBuffer client_id_list;
4604   SilcBuffer client_mode_list;
4605   SilcBuffer idp;
4606   SilcUInt32 list_count = 0, len = 0;
4607
4608   if (!silc_hash_table_count(channel->user_list))
4609     return FALSE;
4610
4611   silc_hash_table_list(channel->user_list, &htl);
4612   while (silc_hash_table_get(&htl, NULL, (void *)&chl))
4613     len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
4614   silc_hash_table_list_reset(&htl);
4615
4616   client_id_list = silc_buffer_alloc(len);
4617   client_mode_list =
4618     silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
4619   silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
4620   silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
4621
4622   silc_hash_table_list(channel->user_list, &htl);
4623   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4624     /* Client ID */
4625     idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
4626     silc_buffer_put(client_id_list, idp->data, idp->len);
4627     silc_buffer_pull(client_id_list, idp->len);
4628     silc_buffer_free(idp);
4629
4630     /* Client's mode on channel */
4631     SILC_PUT32_MSB(chl->mode, client_mode_list->data);
4632     silc_buffer_pull(client_mode_list, 4);
4633
4634     list_count++;
4635   }
4636   silc_hash_table_list_reset(&htl);
4637   silc_buffer_push(client_id_list,
4638                    client_id_list->data - client_id_list->head);
4639   silc_buffer_push(client_mode_list,
4640                    client_mode_list->data - client_mode_list->head);
4641
4642   *user_list = client_id_list;
4643   *mode_list = client_mode_list;
4644   *user_count = list_count;
4645   return TRUE;
4646 }
4647
4648 /* Saves users and their modes to the `channel'. */
4649
4650 void silc_server_save_users_on_channel(SilcServer server,
4651                                        SilcSocketConnection sock,
4652                                        SilcChannelEntry channel,
4653                                        SilcClientID *noadd,
4654                                        SilcBuffer user_list,
4655                                        SilcBuffer mode_list,
4656                                        SilcUInt32 user_count)
4657 {
4658   int i;
4659   SilcUInt16 idp_len;
4660   SilcUInt32 mode;
4661   SilcClientID *client_id;
4662   SilcClientEntry client;
4663   SilcIDCacheEntry cache;
4664   SilcChannelClientEntry chl;
4665
4666   SILC_LOG_DEBUG(("Saving %d users on %s channel", user_count,
4667                   channel->channel_name));
4668
4669   for (i = 0; i < user_count; i++) {
4670     /* Client ID */
4671     SILC_GET16_MSB(idp_len, user_list->data + 2);
4672     idp_len += 4;
4673     client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
4674     silc_buffer_pull(user_list, idp_len);
4675     if (!client_id)
4676       continue;
4677
4678     /* Mode */
4679     SILC_GET32_MSB(mode, mode_list->data);
4680     silc_buffer_pull(mode_list, 4);
4681
4682     if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
4683       silc_free(client_id);
4684       continue;
4685     }
4686
4687     cache = NULL;
4688
4689     /* Check if we have this client cached already. */
4690     client = silc_idlist_find_client_by_id(server->local_list, client_id,
4691                                            server->server_type, &cache);
4692     if (!client)
4693       client = silc_idlist_find_client_by_id(server->global_list,
4694                                              client_id, server->server_type,
4695                                              &cache);
4696     if (!client) {
4697       /* If router did not find such Client ID in its lists then this must
4698          be bogus client or some router in the net is buggy. */
4699       if (server->server_type != SILC_SERVER) {
4700         silc_free(client_id);
4701         continue;
4702       }
4703
4704       /* We don't have that client anywhere, add it. The client is added
4705          to global list since server didn't have it in the lists so it must be
4706          global. */
4707       client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
4708                                       silc_id_dup(client_id, SILC_ID_CLIENT),
4709                                       sock->user_data, NULL, 0);
4710       if (!client) {
4711         SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
4712         silc_free(client_id);
4713         continue;
4714       }
4715
4716       client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
4717     }
4718
4719     if (cache)
4720       cache->expire = 0;
4721     silc_free(client_id);
4722
4723     if (!(client->data.status & SILC_IDLIST_STATUS_REGISTERED)) {
4724       SILC_LOG_ERROR(("Attempting to add unregistered client to channel ",
4725                       "%s", channel->channel_name));
4726       continue;
4727     }
4728
4729     if (!silc_server_client_on_channel(client, channel, &chl)) {
4730       /* Client was not on the channel, add it. */
4731       chl = silc_calloc(1, sizeof(*chl));
4732       chl->client = client;
4733       chl->mode = mode;
4734       chl->channel = channel;
4735       silc_hash_table_add(channel->user_list, chl->client, chl);
4736       silc_hash_table_add(client->channels, chl->channel, chl);
4737       channel->user_count++;
4738     } else {
4739       /* Update mode */
4740       chl->mode = mode;
4741     }
4742   }
4743 }
4744
4745 /* Saves channels and channels user modes to the `client'.  Removes
4746    the client from those channels that are not sent in the list but
4747    it has joined. */
4748
4749 void silc_server_save_user_channels(SilcServer server,
4750                                     SilcSocketConnection sock,
4751                                     SilcClientEntry client,
4752                                     SilcBuffer channels,
4753                                     SilcBuffer channels_user_modes)
4754 {
4755   SilcDList ch;
4756   SilcUInt32 *chumodes;
4757   SilcChannelPayload entry;
4758   SilcChannelEntry channel;
4759   SilcChannelID *channel_id;
4760   SilcChannelClientEntry chl;
4761   SilcHashTable ht = NULL;
4762   SilcHashTableList htl;
4763   char *name;
4764   int i = 0;
4765
4766   if (!channels || !channels_user_modes ||
4767       !(client->data.status & SILC_IDLIST_STATUS_REGISTERED))
4768     goto out;
4769
4770   ch = silc_channel_payload_parse_list(channels->data, channels->len);
4771   if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4772                                &chumodes)) {
4773     ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4774                                NULL, NULL, NULL, TRUE);
4775     silc_dlist_start(ch);
4776     while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4777       /* Check if we have this channel, and add it if we don't have it.
4778          Also add the client on the channel unless it is there already. */
4779       channel_id = silc_channel_get_id_parse(entry);
4780       channel = silc_idlist_find_channel_by_id(server->local_list,
4781                                                channel_id, NULL);
4782       if (!channel)
4783         channel = silc_idlist_find_channel_by_id(server->global_list,
4784                                                  channel_id, NULL);
4785       if (!channel) {
4786         if (server->server_type != SILC_SERVER) {
4787           silc_free(channel_id);
4788           i++;
4789           continue;
4790         }
4791
4792         /* We don't have that channel anywhere, add it. */
4793         name = silc_channel_get_name(entry, NULL);
4794         channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4795                                           channel_id, server->router,
4796                                           NULL, NULL, 0);
4797         if (!channel) {
4798           silc_free(channel_id);
4799           i++;
4800           continue;
4801         }
4802         channel_id = NULL;
4803       }
4804
4805       channel->mode = silc_channel_get_mode(entry);
4806
4807       /* Add the client on the channel */
4808       if (!silc_server_client_on_channel(client, channel, &chl)) {
4809         chl = silc_calloc(1, sizeof(*chl));
4810         chl->client = client;
4811         chl->mode = chumodes[i++];
4812         chl->channel = channel;
4813         silc_hash_table_add(channel->user_list, chl->client, chl);
4814         silc_hash_table_add(client->channels, chl->channel, chl);
4815         channel->user_count++;
4816       } else {
4817         /* Update mode */
4818         chl->mode = chumodes[i++];
4819       }
4820
4821       silc_hash_table_add(ht, channel, channel);
4822       silc_free(channel_id);
4823     }
4824     silc_channel_payload_list_free(ch);
4825     silc_free(chumodes);
4826   }
4827
4828  out:
4829   /* Go through the list again and remove client from channels that
4830      are no part of the list. */
4831   if (ht) {
4832     silc_hash_table_list(client->channels, &htl);
4833     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4834       if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4835         silc_hash_table_del(chl->channel->user_list, chl->client);
4836         silc_hash_table_del(chl->client->channels, chl->channel);
4837         silc_free(chl);
4838       }
4839     }
4840     silc_hash_table_list_reset(&htl);
4841     silc_hash_table_free(ht);
4842   } else {
4843     silc_hash_table_list(client->channels, &htl);
4844     while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4845       silc_hash_table_del(chl->channel->user_list, chl->client);
4846       silc_hash_table_del(chl->client->channels, chl->channel);
4847       silc_free(chl);
4848     }
4849     silc_hash_table_list_reset(&htl);
4850   }
4851 }
4852
4853 /* Lookups route to the client indicated by the `id_data'. The connection
4854    object and internal data object is returned. Returns NULL if route
4855    could not be found to the client. If the `client_id' is specified then
4856    it is used and the `id_data' is ignored. */
4857
4858 SilcSocketConnection
4859 silc_server_get_client_route(SilcServer server,
4860                              unsigned char *id_data,
4861                              SilcUInt32 id_len,
4862                              SilcClientID *client_id,
4863                              SilcIDListData *idata,
4864                              SilcClientEntry *client_entry)
4865 {
4866   SilcClientID *id;
4867   SilcClientEntry client;
4868
4869   SILC_LOG_DEBUG(("Start"));
4870
4871   if (client_entry)
4872     *client_entry = NULL;
4873
4874   /* Decode destination Client ID */
4875   if (!client_id) {
4876     id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4877     if (!id) {
4878       SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4879       return NULL;
4880     }
4881   } else {
4882     id = silc_id_dup(client_id, SILC_ID_CLIENT);
4883   }
4884
4885   /* If the destination belongs to our server we don't have to route
4886      the packet anywhere but to send it to the local destination. */
4887   client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4888   if (client) {
4889     silc_free(id);
4890
4891     /* If we are router and the client has router then the client is in
4892        our cell but not directly connected to us. */
4893     if (server->server_type == SILC_ROUTER && client->router) {
4894       /* We are of course in this case the client's router thus the route
4895          to the client is the server who owns the client. So, we will send
4896          the packet to that server. */
4897       if (idata)
4898         *idata = (SilcIDListData)client->router;
4899       return client->router->connection;
4900     }
4901
4902     /* Seems that client really is directly connected to us */
4903     if (idata)
4904       *idata = (SilcIDListData)client;
4905     if (client_entry)
4906       *client_entry = client;
4907     return client->connection;
4908   }
4909
4910   /* Destination belongs to someone not in this server. If we are normal
4911      server our action is to send the packet to our router. */
4912   if (server->server_type != SILC_ROUTER && !server->standalone) {
4913     silc_free(id);
4914     if (idata)
4915       *idata = (SilcIDListData)server->router;
4916     return SILC_PRIMARY_ROUTE(server);
4917   }
4918
4919   /* We are router and we will perform route lookup for the destination
4920      and send the packet to fastest route. */
4921   if (server->server_type == SILC_ROUTER && !server->standalone) {
4922     /* Check first that the ID is valid */
4923     client = silc_idlist_find_client_by_id(server->global_list, id,
4924                                            TRUE, NULL);
4925     if (client) {
4926       SilcSocketConnection dst_sock;
4927
4928       dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4929
4930       silc_free(id);
4931       if (idata)
4932         *idata = (SilcIDListData)dst_sock->user_data;
4933       return dst_sock;
4934     }
4935   }
4936
4937   silc_free(id);
4938   return NULL;
4939 }
4940
4941 /* Encodes and returns channel list of channels the `client' has joined.
4942    Secret channels are not put to the list. */
4943
4944 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4945                                                SilcClientEntry client,
4946                                                bool get_private,
4947                                                bool get_secret,
4948                                                SilcBuffer *user_mode_list)
4949 {
4950   SilcBuffer buffer = NULL;
4951   SilcChannelEntry channel;
4952   SilcChannelClientEntry chl;
4953   SilcHashTableList htl;
4954   unsigned char *cid;
4955   SilcUInt32 id_len;
4956   SilcUInt16 name_len;
4957   int len;
4958
4959   if (user_mode_list)
4960     *user_mode_list = NULL;
4961
4962   silc_hash_table_list(client->channels, &htl);
4963   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4964     channel = chl->channel;
4965
4966     if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4967       continue;
4968     if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4969       continue;
4970
4971     cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4972     id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4973     name_len = strlen(channel->channel_name);
4974
4975     len = 4 + name_len + id_len + 4;
4976     buffer = silc_buffer_realloc(buffer,
4977                                  (buffer ? buffer->truelen + len : len));
4978     silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4979     silc_buffer_format(buffer,
4980                        SILC_STR_UI_SHORT(name_len),
4981                        SILC_STR_UI_XNSTRING(channel->channel_name,
4982                                             name_len),
4983                        SILC_STR_UI_SHORT(id_len),
4984                        SILC_STR_UI_XNSTRING(cid, id_len),
4985                        SILC_STR_UI_INT(chl->channel->mode),
4986                        SILC_STR_END);
4987     silc_buffer_pull(buffer, len);
4988     silc_free(cid);
4989
4990     if (user_mode_list) {
4991       *user_mode_list = silc_buffer_realloc(*user_mode_list,
4992                                             (*user_mode_list ?
4993                                              (*user_mode_list)->truelen + 4 :
4994                                              4));
4995       silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
4996                                               (*user_mode_list)->data));
4997       SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
4998       silc_buffer_pull(*user_mode_list, 4);
4999     }
5000   }
5001   silc_hash_table_list_reset(&htl);
5002
5003   if (buffer)
5004     silc_buffer_push(buffer, buffer->data - buffer->head);
5005   if (user_mode_list && *user_mode_list)
5006     silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
5007                                        (*user_mode_list)->head));
5008
5009   return buffer;
5010 }
5011
5012 /* A timeout callback for the re-key. We will be the initiator of the
5013    re-key protocol. */
5014
5015 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_callback)
5016 {
5017   SilcServer server = app_context;
5018   SilcSocketConnection sock = (SilcSocketConnection)context;
5019   SilcIDListData idata = (SilcIDListData)sock->user_data;
5020   SilcProtocol protocol;
5021   SilcServerRekeyInternalContext *proto_ctx;
5022
5023   /* Allocate internal protocol context. This is sent as context
5024      to the protocol. */
5025   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
5026   proto_ctx->server = (void *)server;
5027   proto_ctx->sock = sock;
5028   proto_ctx->responder = FALSE;
5029   proto_ctx->pfs = idata->rekey->pfs;
5030
5031   /* Perform rekey protocol. Will call the final callback after the
5032      protocol is over. */
5033   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
5034                       &protocol, proto_ctx, silc_server_rekey_final);
5035   sock->protocol = protocol;
5036
5037   /* Run the protocol */
5038   silc_protocol_execute(protocol, server->schedule, 0, 0);
5039
5040   SILC_LOG_DEBUG(("Rekey protocol completed"));
5041
5042   /* Re-register re-key timeout */
5043   silc_schedule_task_add(server->schedule, sock->sock,
5044                          silc_server_rekey_callback,
5045                          context, idata->rekey->timeout, 0,
5046                          SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
5047 }
5048
5049 /* The final callback for the REKEY protocol. This will actually take the
5050    new key material into use. */
5051
5052 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
5053 {
5054   SilcProtocol protocol = (SilcProtocol)context;
5055   SilcServerRekeyInternalContext *ctx =
5056     (SilcServerRekeyInternalContext *)protocol->context;
5057   SilcServer server = (SilcServer)ctx->server;
5058   SilcSocketConnection sock = ctx->sock;
5059
5060   SILC_LOG_DEBUG(("Start"));
5061
5062   if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
5063       protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
5064     /* Error occured during protocol */
5065     SILC_LOG_ERROR(("Error occurred during rekey protocol with
5066                    %s (%s)", sock->hostname, sock->ip));
5067     silc_protocol_cancel(protocol, server->schedule);
5068     silc_protocol_free(protocol);
5069     sock->protocol = NULL;
5070     if (ctx->packet)
5071       silc_packet_context_free(ctx->packet);
5072     if (ctx->ske)
5073       silc_ske_free(ctx->ske);
5074     silc_free(ctx);
5075     return;
5076   }
5077
5078   /* Purge the outgoing data queue to assure that all rekey packets really
5079      go to the network before we quit the protocol. */
5080   silc_server_packet_queue_purge(server, sock);
5081
5082   /* Cleanup */
5083   silc_protocol_free(protocol);
5084   sock->protocol = NULL;
5085   if (ctx->packet)
5086     silc_packet_context_free(ctx->packet);
5087   if (ctx->ske)
5088     silc_ske_free(ctx->ske);
5089   silc_free(ctx);
5090 }
5091
5092 /* Task callback used to retrieve network statistical information from
5093    router server once in a while. */
5094
5095 SILC_TASK_CALLBACK(silc_server_get_stats)
5096 {
5097   SilcServer server = (SilcServer)context;
5098   SilcBuffer idp, packet;
5099
5100   SILC_LOG_DEBUG(("Retrieving stats from router"));
5101
5102   if (!server->standalone) {
5103     idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
5104     packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
5105                                             ++server->cmd_ident, 1,
5106                                             1, idp->data, idp->len);
5107     silc_server_packet_send(server, SILC_PRIMARY_ROUTE(server),
5108                             SILC_PACKET_COMMAND, 0, packet->data,
5109                             packet->len, FALSE);
5110     silc_buffer_free(packet);
5111     silc_buffer_free(idp);
5112   }
5113
5114   silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
5115                          server, 120, 0, SILC_TASK_TIMEOUT,
5116                          SILC_TASK_PRI_LOW);
5117 }