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