lib/silcclient/client_register.c

   1 /*
   2
   3   client_register.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 2006 - 2007 Pekka Riikonen
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; version 2 of the License.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18 */
  19
  20 #include "silc.h"
  21 #include "silcclient.h"
  22 #include "client_internal.h"
  23
  24 /************************** Types and definitions ***************************/
  25
  26 /* Resume session context */
  27 typedef struct {
  28   SilcClient client;
  29   SilcClientConnection conn;
  30   SilcBufferStruct detach;
  31   char *nickname;
  32   SilcUInt32 channel_count;
  33 } *SilcClientResumeSession;
  34
  35 /************************ Static utility functions **************************/
  36
  37 /* Continues resuming after resolving.  Continue after last reply. */
  38
  39 static SilcBool
  40 silc_client_resume_continue(SilcClient client,
  41                             SilcClientConnection conn,
  42                             SilcCommand command,
  43                             SilcStatus status,
  44                             SilcStatus error,
  45                             void *context,
  46                             va_list ap)
  47 {
  48   if (status == SILC_STATUS_OK || status == SILC_STATUS_LIST_END ||
  49       SILC_STATUS_IS_ERROR(status)) {
  50     silc_fsm_continue(&conn->internal->event_thread);
  51     return FALSE;
  52   }
  53
  54   return TRUE;
  55 }
  56
  57 /* Function used to call command replies back to application in resuming. */
  58
  59 static void
  60 silc_client_resume_command_callback(SilcClient client,
  61                                     SilcClientConnection conn,
  62                                     SilcCommand command, ...)
  63 {
  64   va_list ap;
  65   va_start(ap, command);
  66   client->internal->ops->command_reply(client, conn, command,
  67                                        SILC_STATUS_OK, SILC_STATUS_OK, ap);
  68   va_end(ap);
  69 }
  70
  71
  72 /****************************** NEW_ID packet *******************************/
  73
  74 /* Received new ID packet from server during registering to SILC network */
  75
  76 SILC_FSM_STATE(silc_client_new_id)
  77 {
  78   SilcClientConnection conn = fsm_context;
  79   SilcClient client = conn->client;
  80   SilcPacket packet = state_context;
  81   char *nick;
  82   SilcID id;
  83
  84   if (conn->local_id)
  85     goto out;
  86
  87   SILC_LOG_DEBUG(("New ID received from server"));
  88
  89   if (!silc_id_payload_parse_id(silc_buffer_data(&packet->buffer),
  90                                 silc_buffer_len(&packet->buffer), &id))
  91     goto out;
  92
  93   SILC_LOG_DEBUG(("New ID %s", silc_id_render(&id.u.client_id,
  94                                               SILC_ID_CLIENT)));
  95
  96   /* From SILC protocol version 1.3, nickname is in NEW_CLIENT packet */
  97   if (conn->internal->remote_version >= 13)
  98     nick = (conn->internal->params.nickname ?
  99             conn->internal->params.nickname : client->username);
 100   else
 101     nick = client->username;
 102
 103   /* Create local client entry */
 104   conn->local_entry = silc_client_add_client(client, conn, nick,
 105                                              client->username,
 106                                              client->realname,
 107                                              &id.u.client_id, 0);
 108   if (!conn->local_entry)
 109     goto out;
 110
 111   /* Save the ID.  Take reference to conn->local_id. */
 112   conn->local_id = &conn->local_entry->id;
 113   conn->internal->local_idp = silc_buffer_copy(&packet->buffer);
 114
 115   /* Save remote ID */
 116   if (packet->src_id_len) {
 117     conn->internal->remote_idp =
 118       silc_id_payload_encode_data(packet->src_id,
 119                                   packet->src_id_len,
 120                                   packet->src_id_type);
 121     if (!conn->internal->remote_idp)
 122       goto out;
 123     silc_id_payload_parse_id(silc_buffer_data(conn->internal->remote_idp),
 124                              silc_buffer_len(conn->internal->remote_idp),
 125                              &conn->remote_id);
 126   }
 127
 128   /* Set IDs to the packet stream */
 129   silc_packet_set_ids(conn->stream, SILC_ID_CLIENT, conn->local_id,
 130                       conn->remote_id.type, SILC_ID_GET_ID(conn->remote_id));
 131
 132   /* Signal connection that new ID was received so it can continue
 133      with the registering. */
 134   if (conn->internal->registering)
 135     silc_fsm_continue_sync(&conn->internal->event_thread);
 136
 137  out:
 138   /** Packet processed */
 139   silc_packet_free(packet);
 140   return SILC_FSM_FINISH;
 141 }
 142
 143
 144 /************************ Register to SILC network **************************/
 145
 146 /* Register to network */
 147
 148 SILC_FSM_STATE(silc_client_st_register)
 149 {
 150   SilcClientConnection conn = fsm_context;
 151   SilcClient client = conn->client;
 152   char *nick = NULL;
 153
 154   SILC_LOG_DEBUG(("Register to network"));
 155
 156   /* From SILC protocol version 1.3, nickname is in NEW_CLIENT packet */
 157   if (conn->internal->remote_version >= 13)
 158     nick = (conn->internal->params.nickname ?
 159             conn->internal->params.nickname : client->username);
 160
 161   /* Send NEW_CLIENT packet to register to network */
 162   if (!silc_packet_send_va(conn->stream, SILC_PACKET_NEW_CLIENT, 0,
 163                            SILC_STR_UI_SHORT(strlen(client->username)),
 164                            SILC_STR_DATA(client->username,
 165                                          strlen(client->username)),
 166                            SILC_STR_UI_SHORT(strlen(client->realname)),
 167                            SILC_STR_DATA(client->realname,
 168                                          strlen(client->realname)),
 169                            SILC_STR_UI_SHORT(nick ? strlen(nick) : 0),
 170                            SILC_STR_DATA(nick, nick ? strlen(nick) : 0),
 171                            SILC_STR_END)) {
 172     /** Error sending packet */
 173     silc_fsm_next(fsm, silc_client_st_register_error);
 174     return SILC_FSM_CONTINUE;
 175   }
 176
 177   /** Wait for new ID */
 178   conn->internal->registering = TRUE;
 179   silc_fsm_next_later(fsm, silc_client_st_register_complete,
 180                       conn->internal->retry_timer, 0);
 181   return SILC_FSM_WAIT;
 182 }
 183
 184 /* Wait for NEW_ID packet to arrive */
 185
 186 SILC_FSM_STATE(silc_client_st_register_complete)
 187 {
 188   SilcClientConnection conn = fsm_context;
 189   SilcClient client = conn->client;
 190
 191   if (conn->internal->disconnected) {
 192     /** Disconnected */
 193     silc_fsm_next(fsm, silc_client_st_register_error);
 194     return SILC_FSM_CONTINUE;
 195   }
 196
 197   if (!conn->local_id) {
 198     if (conn->internal->retry_count++ >= SILC_CLIENT_RETRY_COUNT) {
 199       /** Timeout, ID not received */
 200       conn->internal->registering = FALSE;
 201       conn->internal->retry_count = 0;
 202       conn->internal->retry_timer = SILC_CLIENT_RETRY_MIN;
 203       silc_fsm_next(fsm, silc_client_st_register_error);
 204       return SILC_FSM_CONTINUE;
 205     }
 206
 207     /** Resend registering packet */
 208     silc_fsm_next(fsm, silc_client_st_register);
 209     conn->internal->retry_timer = ((conn->internal->retry_timer *
 210                                     SILC_CLIENT_RETRY_MUL) +
 211                                    (silc_rng_get_rn16(client->rng) %
 212                                     SILC_CLIENT_RETRY_RAND));
 213     return SILC_FSM_CONTINUE;
 214   }
 215
 216   SILC_LOG_DEBUG(("Registered to network"));
 217
 218   /* Issue IDENTIFY command for itself to get resolved hostname
 219      correctly from server. */
 220   silc_client_command_send(client, conn, SILC_COMMAND_IDENTIFY,
 221                            silc_client_command_called_dummy, NULL,
 222                            1, 5, silc_buffer_data(conn->internal->local_idp),
 223                            silc_buffer_len(conn->internal->local_idp));
 224
 225   /* With SILC protocol version 1.2 call NICK command if the nickname was
 226      set by the application. */
 227   if (conn->internal->params.nickname && conn->internal->remote_version < 13 &&
 228       !silc_utf8_strcasecmp(conn->internal->params.nickname, client->username))
 229     silc_client_command_call(client, conn, NULL,
 230                              "NICK", conn->internal->params.nickname, NULL);
 231
 232   /* Issue INFO command to fetch the real server name and server
 233      information and other stuff. */
 234   silc_client_command_send(client, conn, SILC_COMMAND_INFO,
 235                            silc_client_command_called_dummy, NULL,
 236                            1, 2, silc_buffer_data(conn->internal->remote_idp),
 237                            silc_buffer_len(conn->internal->remote_idp));
 238
 239   /* Call connection callback.  We are now inside SILC network. */
 240   conn->callback(client, conn, SILC_CLIENT_CONN_SUCCESS, 0, NULL,
 241                  conn->callback_context);
 242
 243   conn->internal->registering = FALSE;
 244   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 245                                 silc_client_connect_timeout, conn);
 246   silc_async_free(conn->internal->cop);
 247   conn->internal->cop = NULL;
 248
 249   return SILC_FSM_FINISH;
 250 }
 251
 252 /* Error registering to network */
 253
 254 SILC_FSM_STATE(silc_client_st_register_error)
 255 {
 256   SilcClientConnection conn = fsm_context;
 257
 258   SILC_LOG_DEBUG(("Error registering to network"));
 259
 260   /* Signal to close connection */
 261   conn->internal->status = SILC_CLIENT_CONN_ERROR;
 262   if (!conn->internal->disconnected) {
 263     conn->internal->disconnected = TRUE;
 264     SILC_FSM_EVENT_SIGNAL(&conn->internal->wait_event);
 265   }
 266
 267   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 268                                 silc_client_connect_timeout, conn);
 269
 270   return SILC_FSM_FINISH;
 271 }
 272
 273 /************************* Resume detached session **************************/
 274
 275 /* Resume detached session */
 276
 277 SILC_FSM_STATE(silc_client_st_resume)
 278 {
 279   SilcClientConnection conn = fsm_context;
 280   SilcClient client = conn->client;
 281   SilcClientResumeSession resume;
 282   SilcBuffer auth;
 283   unsigned char *id;
 284   SilcUInt16 id_len;
 285   SilcClientID client_id;
 286   int ret;
 287
 288   SILC_LOG_DEBUG(("Resuming detached session"));
 289
 290   resume = silc_calloc(1, sizeof(*resume));
 291   if (!resume) {
 292     /** Out of memory */
 293     silc_fsm_next(fsm, silc_client_st_resume_error);
 294     return SILC_FSM_CONTINUE;
 295   }
 296   silc_fsm_set_state_context(fsm, resume);
 297
 298   silc_buffer_set(&resume->detach, conn->internal->params.detach_data,
 299                   conn->internal->params.detach_data_len);
 300   SILC_LOG_HEXDUMP(("Detach data"), silc_buffer_data(&resume->detach),
 301                    silc_buffer_len(&resume->detach));
 302
 303   /* Take the old client ID from the detachment data */
 304   ret = silc_buffer_unformat(&resume->detach,
 305                              SILC_STR_ADVANCE,
 306                              SILC_STR_UI16_NSTRING_ALLOC(&resume->nickname,
 307                                                          NULL),
 308                              SILC_STR_UI16_NSTRING(&id, &id_len),
 309                              SILC_STR_UI_INT(NULL),
 310                              SILC_STR_UI_INT(&resume->channel_count),
 311                              SILC_STR_END);
 312   if (ret < 0) {
 313     /** Malformed detach data */
 314     SILC_LOG_DEBUG(("Malformed detachment data"));
 315     silc_fsm_next(fsm, silc_client_st_resume_error);
 316     return SILC_FSM_CONTINUE;
 317   }
 318
 319   if (!silc_id_str2id(id, id_len, SILC_ID_CLIENT, &client_id,
 320                       sizeof(client_id))) {
 321     /** Malformed ID */
 322     SILC_LOG_DEBUG(("Malformed ID"));
 323     silc_fsm_next(fsm, silc_client_st_resume_error);
 324     return SILC_FSM_CONTINUE;
 325   }
 326
 327   /* Generate authentication data that server will verify */
 328   auth = silc_auth_public_key_auth_generate(conn->public_key,
 329                                             conn->private_key,
 330                                             client->rng,
 331                                             conn->internal->hash,
 332                                             &client_id, SILC_ID_CLIENT);
 333   if (!auth) {
 334     /** Out of memory */
 335     silc_fsm_next(fsm, silc_client_st_resume_error);
 336     return SILC_FSM_CONTINUE;
 337   }
 338
 339   /* Send RESUME_CLIENT packet to resume to network */
 340   if (!silc_packet_send_va(conn->stream, SILC_PACKET_RESUME_CLIENT, 0,
 341                            SILC_STR_UI_SHORT(id_len),
 342                            SILC_STR_DATA(id, id_len),
 343                            SILC_STR_DATA(silc_buffer_data(auth),
 344                                          silc_buffer_len(auth)),
 345                            SILC_STR_END)) {
 346     /** Error sending packet */
 347     SILC_LOG_DEBUG(("Error sending packet"));
 348     silc_fsm_next(fsm, silc_client_st_resume_error);
 349     return SILC_FSM_CONTINUE;
 350   }
 351
 352   /** Wait for new ID */
 353   conn->internal->registering = TRUE;
 354   silc_fsm_next_later(fsm, silc_client_st_resume_resolve_channels, 15, 0);
 355   return SILC_FSM_WAIT;
 356 }
 357
 358 /* Resolve the old session information, user mode and joined channels. */
 359
 360 SILC_FSM_STATE(silc_client_st_resume_resolve_channels)
 361 {
 362   SilcClientConnection conn = fsm_context;
 363   SilcClient client = conn->client;
 364   SilcClientResumeSession resume = state_context;
 365   SilcUInt32 *res_argv_lens = NULL, *res_argv_types = NULL, res_argc = 0;
 366   unsigned char **res_argv = NULL;
 367   int i;
 368
 369   if (conn->internal->disconnected) {
 370     /** Disconnected */
 371     silc_fsm_next(fsm, silc_client_st_resume_error);
 372     return SILC_FSM_CONTINUE;
 373   }
 374
 375   if (!conn->local_id) {
 376     /** Timeout, ID not received */
 377     conn->internal->registering = FALSE;
 378     silc_fsm_next(fsm, silc_client_st_resume_error);
 379     return SILC_FSM_CONTINUE;
 380   }
 381
 382   /** Wait for channels */
 383   silc_fsm_next(fsm, silc_client_st_resume_resolve_cmodes);
 384
 385   /* Change our nickname */
 386   silc_client_change_nickname(client, conn, conn->local_entry,
 387                               resume->nickname, NULL, NULL, 0);
 388
 389   /* Send UMODE command to get our own user mode in the network */
 390   SILC_LOG_DEBUG(("Resolving user mode"));
 391   silc_client_command_send(client, conn, SILC_COMMAND_UMODE,
 392                            silc_client_command_called_dummy, NULL,
 393                            1, 1, silc_buffer_data(conn->internal->local_idp),
 394                            silc_buffer_len(conn->internal->local_idp));
 395
 396   if (!resume->channel_count)
 397     return SILC_FSM_YIELD;
 398
 399   /* Send IDENTIFY command for all channels we know about.  These are the
 400      channels we've joined to according our detachment data. */
 401   for (i = 0; i < resume->channel_count; i++) {
 402     SilcChannelEntry channel;
 403     unsigned char *chid;
 404     SilcUInt16 chid_len;
 405     SilcBuffer idp;
 406     SilcChannelID channel_id;
 407     char *name;
 408
 409     if (silc_buffer_unformat(&resume->detach,
 410                              SILC_STR_ADVANCE,
 411                              SILC_STR_UI16_NSTRING(&name, NULL),
 412                              SILC_STR_UI16_NSTRING(&chid, &chid_len),
 413                              SILC_STR_UI_INT(NULL),
 414                              SILC_STR_END) < 0)
 415       continue;
 416
 417     if (!silc_id_str2id(chid, chid_len, SILC_ID_CHANNEL, &channel_id,
 418                         sizeof(channel_id)))
 419       continue;
 420     idp = silc_id_payload_encode_data(chid, chid_len, SILC_ID_CHANNEL);
 421     if (!idp)
 422       continue;
 423
 424     /* Add the channel to cache */
 425     channel = silc_client_get_channel_by_id(client, conn, &channel_id);
 426     if (!channel)
 427       silc_client_add_channel(client, conn, name, 0, &channel_id);
 428     else
 429       silc_client_unref_channel(client, conn, channel);
 430
 431     res_argv = silc_realloc(res_argv, sizeof(*res_argv) * (res_argc + 1));
 432     res_argv_lens = silc_realloc(res_argv_lens, sizeof(*res_argv_lens) *
 433                                  (res_argc + 1));
 434     res_argv_types = silc_realloc(res_argv_types, sizeof(*res_argv_types) *
 435                                   (res_argc + 1));
 436     res_argv[res_argc] = silc_buffer_steal(idp, &res_argv_lens[res_argc]);
 437     res_argv_types[res_argc] = res_argc + 5;
 438     res_argc++;
 439     silc_buffer_free(idp);
 440   }
 441
 442   /* Send IDENTIFY command */
 443   SILC_LOG_DEBUG(("Resolving joined channels"));
 444   silc_client_command_send_argv(client, conn, SILC_COMMAND_IDENTIFY,
 445                                 silc_client_resume_continue, conn,
 446                                 res_argc, res_argv, res_argv_lens,
 447                                 res_argv_types);
 448
 449   for (i = 0; i < resume->channel_count; i++)
 450     silc_free(res_argv[i]);
 451   silc_free(res_argv);
 452   silc_free(res_argv_lens);
 453   silc_free(res_argv_types);
 454
 455   return SILC_FSM_WAIT;
 456 }
 457
 458 /* Resolve joined channel modes, users and topics. */
 459
 460 SILC_FSM_STATE(silc_client_st_resume_resolve_cmodes)
 461 {
 462   SilcClientConnection conn = fsm_context;
 463   SilcClient client = conn->client;
 464   SilcClientResumeSession resume = state_context;
 465   SilcIDCacheEntry entry;
 466   SilcChannelEntry channel;
 467   SilcList channels;
 468   SilcBuffer idp;
 469
 470   if (conn->internal->disconnected) {
 471     /** Disconnected */
 472     silc_fsm_next(fsm, silc_client_st_resume_error);
 473     return SILC_FSM_CONTINUE;
 474   }
 475
 476   SILC_LOG_DEBUG(("Resolving channel details"));
 477
 478   /** Wait for channel modes */
 479   silc_fsm_next(fsm, silc_client_st_resume_completed);
 480
 481   if (!silc_idcache_get_all(conn->internal->channel_cache, &channels))
 482     return SILC_FSM_YIELD;
 483
 484   /* Resolve channels' mode, users and topic */
 485   resume->channel_count = silc_list_count(channels) * 3;
 486   silc_list_start(channels);
 487   while ((entry = silc_list_get(channels))) {
 488     channel = entry->context;
 489     idp = silc_id_payload_encode(&channel->id, SILC_ID_CHANNEL);
 490     if (!idp)
 491       continue;
 492
 493     silc_client_command_send(client, conn, SILC_COMMAND_CMODE,
 494                              silc_client_resume_continue, conn, 1,
 495                              1, silc_buffer_data(idp),
 496                              silc_buffer_len(idp));
 497     silc_client_command_send(client, conn, SILC_COMMAND_USERS,
 498                              silc_client_resume_continue, conn, 1,
 499                              1, silc_buffer_data(idp),
 500                              silc_buffer_len(idp));
 501     silc_client_command_send(client, conn, SILC_COMMAND_TOPIC,
 502                              silc_client_resume_continue, conn, 1,
 503                              1, silc_buffer_data(idp),
 504                              silc_buffer_len(idp));
 505     silc_buffer_free(idp);
 506   }
 507
 508   return SILC_FSM_WAIT;
 509 }
 510
 511 /* Resuming completed */
 512
 513 SILC_FSM_STATE(silc_client_st_resume_completed)
 514 {
 515   SilcClientConnection conn = fsm_context;
 516   SilcClient client = conn->client;
 517   SilcClientResumeSession resume = state_context;
 518   SilcIDCacheEntry entry;
 519   SilcChannelEntry channel;
 520   SilcList channels;
 521
 522   if (conn->internal->disconnected) {
 523     /** Disconnected */
 524     silc_fsm_next(fsm, silc_client_st_resume_error);
 525     return SILC_FSM_CONTINUE;
 526   }
 527
 528   if (resume->channel_count > 0) {
 529     resume->channel_count--;
 530     if (resume->channel_count)
 531       return SILC_FSM_WAIT;
 532   }
 533
 534   SILC_LOG_DEBUG(("Resuming completed"));
 535
 536   /* Issue IDENTIFY command for itself to get resolved hostname
 537      correctly from server. */
 538   silc_client_command_send(client, conn, SILC_COMMAND_IDENTIFY,
 539                            silc_client_command_called_dummy, NULL,
 540                            1, 5, silc_buffer_data(conn->internal->local_idp),
 541                            silc_buffer_len(conn->internal->local_idp));
 542
 543   /* Issue INFO command to fetch the real server name and server
 544      information and other stuff. */
 545   silc_client_command_send(client, conn, SILC_COMMAND_INFO,
 546                            silc_client_command_called_dummy, NULL,
 547                            1, 2, silc_buffer_data(conn->internal->remote_idp),
 548                            silc_buffer_len(conn->internal->remote_idp));
 549
 550   /* Call connection callback.  We have now resumed to SILC network. */
 551   conn->callback(client, conn, SILC_CLIENT_CONN_SUCCESS_RESUME, 0, NULL,
 552                  conn->callback_context);
 553
 554   /* Call UMODE command reply. */
 555   if (conn->local_entry->mode)
 556     silc_client_resume_command_callback(client, conn, SILC_COMMAND_UMODE,
 557                                         conn->local_entry->mode);
 558
 559   /* Call NICK command reply. */
 560   silc_client_resume_command_callback(client, conn, SILC_COMMAND_NICK,
 561                                       conn->local_entry,
 562                                       conn->local_entry->nickname,
 563                                       &conn->local_entry->id);
 564
 565   /* Call JOIN command replies for all joined channel */
 566   if (silc_idcache_get_all(conn->internal->channel_cache, &channels)) {
 567     silc_list_start(channels);
 568     while ((entry = silc_list_get(channels))) {
 569       SilcHashTableList htl;
 570       const char *cipher, *hmac;
 571
 572       channel = entry->context;
 573       cipher = (channel->internal.send_key ?
 574                 silc_cipher_get_name(channel->internal.send_key) : NULL);
 575       hmac = (channel->internal.hmac ?
 576               silc_hmac_get_name(channel->internal.hmac) : NULL);
 577       silc_hash_table_list(channel->user_list, &htl);
 578       silc_client_resume_command_callback(client, conn, SILC_COMMAND_JOIN,
 579                                           channel->channel_name, channel,
 580                                           channel->mode, &htl, channel->topic,
 581                                           cipher, hmac, channel->founder_key,
 582                                           channel->channel_pubkeys,
 583                                           channel->user_limit);
 584       silc_hash_table_list_reset(&htl);
 585     }
 586   }
 587
 588   conn->internal->registering = FALSE;
 589   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 590                                 silc_client_connect_timeout, conn);
 591   silc_free(resume->nickname);
 592   silc_free(resume);
 593   silc_async_free(conn->internal->cop);
 594   conn->internal->cop = NULL;
 595
 596   return SILC_FSM_FINISH;
 597 }
 598
 599 /* Error resuming to network */
 600
 601 SILC_FSM_STATE(silc_client_st_resume_error)
 602 {
 603   SilcClientConnection conn = fsm_context;
 604   SilcClientResumeSession resume = state_context;
 605
 606   if (conn->internal->disconnected) {
 607     if (resume) {
 608       silc_free(resume->nickname);
 609       silc_free(resume);
 610     }
 611     return SILC_FSM_FINISH;
 612   }
 613
 614   SILC_LOG_DEBUG(("Error resuming to network"));
 615
 616   /* Signal to close connection */
 617   conn->internal->status = SILC_CLIENT_CONN_ERROR;
 618   if (!conn->internal->disconnected) {
 619     conn->internal->disconnected = TRUE;
 620     SILC_FSM_EVENT_SIGNAL(&conn->internal->wait_event);
 621   }
 622
 623   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 624                                 silc_client_connect_timeout, conn);
 625
 626   if (resume) {
 627     silc_free(resume->nickname);
 628     silc_free(resume);
 629   }
 630
 631   return SILC_FSM_FINISH;
 632 }
 633
 634 /* Generates the session detachment data. This data can be used later
 635    to resume back to the server. */
 636
 637 SilcBuffer silc_client_get_detach_data(SilcClient client,
 638                                        SilcClientConnection conn)
 639 {
 640   SilcBuffer detach;
 641   SilcHashTableList htl;
 642   SilcChannelUser chu;
 643   unsigned char id[64];
 644   SilcUInt32 id_len;
 645   int ret, ch_count;
 646
 647   SILC_LOG_DEBUG(("Creating detachment data"));
 648
 649   ch_count = silc_hash_table_count(conn->local_entry->channels);
 650   silc_id_id2str(conn->local_id, SILC_ID_CLIENT, id, sizeof(id), &id_len);
 651
 652   /* Save the nickname, Client ID and user mode in SILC network */
 653   detach = silc_buffer_alloc(0);
 654   if (!detach)
 655     return NULL;
 656   ret =
 657     silc_buffer_format(detach,
 658                        SILC_STR_ADVANCE,
 659                        SILC_STR_UI_SHORT(strlen(conn->local_entry->nickname)),
 660                        SILC_STR_DATA(conn->local_entry->nickname,
 661                                      strlen(conn->local_entry->nickname)),
 662                        SILC_STR_UI_SHORT(id_len),
 663                        SILC_STR_DATA(id, id_len),
 664                        SILC_STR_UI_INT(conn->local_entry->mode),
 665                        SILC_STR_UI_INT(ch_count),
 666                        SILC_STR_END);
 667   if (ret < 0) {
 668     silc_buffer_free(detach);
 669     return NULL;
 670   }
 671
 672   /* Save all joined channels */
 673   silc_hash_table_list(conn->local_entry->channels, &htl);
 674   while (silc_hash_table_get(&htl, NULL, (void *)&chu)) {
 675     unsigned char chid[32];
 676     SilcUInt32 chid_len;
 677
 678     silc_id_id2str(&chu->channel->id, SILC_ID_CHANNEL, chid, sizeof(chid),
 679                    &chid_len);
 680     silc_buffer_format(detach,
 681                        SILC_STR_ADVANCE,
 682                        SILC_STR_UI_SHORT(strlen(chu->channel->channel_name)),
 683                        SILC_STR_DATA(chu->channel->channel_name,
 684                                      strlen(chu->channel->channel_name)),
 685                        SILC_STR_UI_SHORT(chid_len),
 686                        SILC_STR_DATA(chid, chid_len),
 687                        SILC_STR_UI_INT(chu->channel->mode),
 688                        SILC_STR_END);
 689   }
 690   silc_hash_table_list_reset(&htl);
 691
 692   silc_buffer_start(detach);
 693   SILC_LOG_HEXDUMP(("Detach data"), silc_buffer_data(detach),
 694                    silc_buffer_len(detach));
 695
 696   return detach;
 697 }