apps/silcd/server.c

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