lib/silcclient/client_connect.c

   1 /*
   2
   3   client_st_connect.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 2006 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 /************************ Static utility functions **************************/
  25
  26 /* Callback called after connected to remote host */
  27
  28 static void silc_client_connect_callback(SilcNetStatus status,
  29                                          SilcStream stream, void *context)
  30 {
  31   SilcFSMThread fsm = context;
  32   SilcClientConnection conn = silc_fsm_get_context(fsm);
  33   SilcClient client = conn->client;
  34
  35   conn->internal->op = NULL;
  36   if (conn->internal->verbose) {
  37     switch (status) {
  38     case SILC_NET_OK:
  39       break;
  40     case SILC_NET_UNKNOWN_IP:
  41       client->internal->ops->say(
  42                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  43                    "Could not connect to host %s: unknown IP address",
  44                    conn->remote_host);
  45       break;
  46     case SILC_NET_UNKNOWN_HOST:
  47       client->internal->ops->say(
  48                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  49                    "Could not connect to host %s: unknown host name",
  50                    conn->remote_host);
  51       break;
  52     case SILC_NET_HOST_UNREACHABLE:
  53       client->internal->ops->say(
  54                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  55                    "Could not connect to host %s: network unreachable",
  56                    conn->remote_host);
  57       break;
  58     case SILC_NET_CONNECTION_REFUSED:
  59       client->internal->ops->say(
  60                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  61                    "Could not connect to host %s: connection refused",
  62                    conn->remote_host);
  63       break;
  64     case SILC_NET_CONNECTION_TIMEOUT:
  65       client->internal->ops->say(
  66                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  67                    "Could not connect to host %s: connection timeout",
  68                    conn->remote_host);
  69       break;
  70     default:
  71       client->internal->ops->say(
  72                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  73                    "Could not connect to host %s",
  74                    conn->remote_host);
  75       break;
  76     }
  77   }
  78
  79   if (status != SILC_NET_OK) {
  80     /* Notify application of failure */
  81     SILC_LOG_DEBUG(("Connecting failed"));
  82     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR, 0,
  83                    NULL, conn->callback_context);
  84     silc_fsm_next(fsm, silc_client_st_connect_error);
  85     SILC_FSM_CALL_CONTINUE(fsm);
  86     return;
  87   }
  88
  89   /* Connection created successfully */
  90   SILC_LOG_DEBUG(("Connected"));
  91   conn->stream = (void *)stream;
  92   SILC_FSM_CALL_CONTINUE(fsm);
  93 }
  94
  95 /* Called after application has verified remote host's public key */
  96
  97 static void silc_client_ke_verify_key_cb(SilcBool success, void *context)
  98 {
  99   VerifyKeyContext verify = (VerifyKeyContext)context;
 100
 101   SILC_LOG_DEBUG(("Start"));
 102
 103   /* Call the completion callback back to the SKE */
 104   verify->completion(verify->ske, success ? SILC_SKE_STATUS_OK :
 105                      SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
 106                      verify->completion_context);
 107
 108   silc_free(verify);
 109 }
 110
 111 /* Verify remote host's public key */
 112
 113 static void silc_client_ke_verify_key(SilcSKE ske,
 114                                       SilcPublicKey public_key,
 115                                       void *context,
 116                                       SilcSKEVerifyCbCompletion completion,
 117                                       void *completion_context)
 118 {
 119   SilcFSMThread fsm = context;
 120   SilcClientConnection conn = silc_fsm_get_context(fsm);
 121   SilcClient client = conn->client;
 122   VerifyKeyContext verify;
 123
 124   /* If we provided repository for SKE and we got here the key was not
 125      found from the repository. */
 126   if (conn->internal->params.repository &&
 127       !conn->internal->params.verify_notfound) {
 128     completion(ske, SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
 129                completion_context);
 130     return;
 131   }
 132
 133   SILC_LOG_DEBUG(("Verify remote public key"));
 134
 135   verify = silc_calloc(1, sizeof(*verify));
 136   if (!verify) {
 137     completion(ske, SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
 138                completion_context);
 139     return;
 140   }
 141   verify->ske = ske;
 142   verify->completion = completion;
 143   verify->completion_context = completion_context;
 144
 145   /* Verify public key in application */
 146   client->internal->ops->verify_public_key(client, conn,
 147                                            conn->type, public_key,
 148                                            silc_client_ke_verify_key_cb,
 149                                            verify);
 150 }
 151
 152 /* Key exchange protocol completion callback */
 153
 154 static void silc_client_ke_completion(SilcSKE ske,
 155                                       SilcSKEStatus status,
 156                                       SilcSKESecurityProperties prop,
 157                                       SilcSKEKeyMaterial keymat,
 158                                       SilcSKERekeyMaterial rekey,
 159                                       void *context)
 160 {
 161   SilcFSMThread fsm = context;
 162   SilcClientConnection conn = silc_fsm_get_context(fsm);
 163   SilcClient client = conn->client;
 164   SilcCipher send_key, receive_key;
 165   SilcHmac hmac_send, hmac_receive;
 166
 167   conn->internal->op = NULL;
 168   if (status != SILC_SKE_STATUS_OK) {
 169     /* Key exchange failed */
 170     SILC_LOG_DEBUG(("Error during key exchange with %s: %s (%d)",
 171                     conn->remote_host, silc_ske_map_status(status), status));
 172
 173     if (conn->internal->verbose)
 174       client->internal->ops->say(client, conn, SILC_CLIENT_MESSAGE_ERROR,
 175                                  "Error during key exchange with %s: %s",
 176                                  conn->remote_host,
 177                                  silc_ske_map_status(status));
 178
 179     silc_ske_free_rekey_material(rekey);
 180
 181     silc_fsm_next(fsm, silc_client_st_connect_error);
 182     SILC_FSM_CALL_CONTINUE(fsm);
 183     return;
 184   }
 185
 186   SILC_LOG_DEBUG(("Setting keys into use"));
 187
 188   /* Allocate the cipher and HMAC contexts */
 189   if (!silc_ske_set_keys(ske, keymat, prop, &send_key, &receive_key,
 190                          &hmac_send, &hmac_receive, &conn->internal->hash)) {
 191     /* Error setting keys */
 192     SILC_LOG_DEBUG(("Could not set keys into use"));
 193
 194     if (conn->internal->verbose)
 195       client->internal->ops->say(
 196                        client, conn, SILC_CLIENT_MESSAGE_ERROR,
 197                        "Error during key exchange with %s: cannot use keys",
 198                        conn->remote_host);
 199
 200     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR_KE, 0, NULL,
 201                    conn->callback_context);
 202
 203     silc_ske_free_rekey_material(rekey);
 204
 205     silc_fsm_next(fsm, silc_client_st_connect_error);
 206     SILC_FSM_CALL_CONTINUE(fsm);
 207     return;
 208   }
 209
 210   /* Set the keys into the packet stream.  After this call packets will be
 211      encrypted with these keys. */
 212   if (!silc_packet_set_keys(conn->stream, send_key, receive_key, hmac_send,
 213                             hmac_receive, FALSE)) {
 214     /* Error setting keys */
 215     SILC_LOG_DEBUG(("Could not set keys into use"));
 216
 217     if (conn->internal->verbose)
 218       client->internal->ops->say(
 219                        client, conn, SILC_CLIENT_MESSAGE_ERROR,
 220                        "Error during key exchange with %s: cannot use keys",
 221                        conn->remote_host);
 222
 223     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR_KE, 0, NULL,
 224                    conn->callback_context);
 225
 226     silc_ske_free_rekey_material(rekey);
 227
 228     silc_fsm_next(fsm, silc_client_st_connect_error);
 229     SILC_FSM_CALL_CONTINUE(fsm);
 230     return;
 231   }
 232
 233   conn->internal->rekey = rekey;
 234
 235   SILC_LOG_DEBUG(("Key Exchange completed"));
 236
 237   /* Key exchange done */
 238   SILC_FSM_CALL_CONTINUE(fsm);
 239 }
 240
 241 /* Rekey protocol completion callback */
 242
 243 static void silc_client_rekey_completion(SilcSKE ske,
 244                                          SilcSKEStatus status,
 245                                          SilcSKESecurityProperties prop,
 246                                          SilcSKEKeyMaterial keymat,
 247                                          SilcSKERekeyMaterial rekey,
 248                                          void *context)
 249 {
 250   SilcFSMThread fsm = context;
 251   SilcClientConnection conn = silc_fsm_get_context(fsm);
 252   SilcClient client = conn->client;
 253
 254   conn->internal->op = NULL;
 255   if (status != SILC_SKE_STATUS_OK) {
 256     /* Rekey failed */
 257     SILC_LOG_DEBUG(("Error during rekey with %s: %s (%d)",
 258                     conn->remote_host, silc_ske_map_status(status), status));
 259
 260     if (conn->internal->verbose)
 261       client->internal->ops->say(client, conn, SILC_CLIENT_MESSAGE_ERROR,
 262                                  "Error during rekey with %s: %s",
 263                                  conn->remote_host,
 264                                  silc_ske_map_status(status));
 265
 266     silc_fsm_finish(fsm);
 267     return;
 268   }
 269
 270   silc_ske_free_rekey_material(conn->internal->rekey);
 271   conn->internal->rekey = rekey;
 272
 273   SILC_LOG_DEBUG(("Rekey completed"));
 274
 275   /* Rekey done */
 276   silc_fsm_finish(fsm);
 277 }
 278
 279 /* Callback called by application to return authentication data */
 280
 281 static void silc_client_connect_auth_method(SilcBool success,
 282                                             SilcAuthMethod auth_meth,
 283                                             void *auth, SilcUInt32 auth_len,
 284                                             void *context)
 285 {
 286   SilcFSMThread fsm = context;
 287   SilcClientConnection conn = silc_fsm_get_context(fsm);
 288
 289   conn->internal->params.auth_method = SILC_AUTH_NONE;
 290
 291   if (success) {
 292     conn->internal->params.auth_method = auth_meth;
 293     conn->internal->params.auth = auth;
 294     conn->internal->params.auth_len = auth_len;
 295   }
 296
 297   SILC_FSM_CALL_CONTINUE(fsm);
 298 }
 299
 300 /* Connection authentication completion callback */
 301
 302 static void silc_client_connect_auth_completion(SilcConnAuth connauth,
 303                                                 SilcBool success,
 304                                                 void *context)
 305 {
 306   SilcFSMThread fsm = context;
 307   SilcClientConnection conn = silc_fsm_get_context(fsm);
 308   SilcClient client = conn->client;
 309
 310   silc_connauth_free(connauth);
 311
 312   if (!success) {
 313     if (conn->internal->verbose)
 314         client->internal->ops->say(
 315                         client, conn, SILC_CLIENT_MESSAGE_ERROR,
 316                         "Authentication failed");
 317
 318     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR_AUTH, 0, NULL,
 319                    conn->callback_context);
 320     silc_fsm_next(fsm, silc_client_st_connect_error);
 321   }
 322
 323   SILC_FSM_CALL_CONTINUE(fsm);
 324 }
 325
 326 /*************************** Connect remote host ****************************/
 327
 328 /* Connection timeout callback */
 329
 330 SILC_TASK_CALLBACK(silc_client_connect_timeout)
 331 {
 332   SilcClientConnection conn = context;
 333   SilcClient client = conn->client;
 334
 335   SILC_LOG_DEBUG(("Connection timeout"));
 336
 337   conn->callback(client, conn, SILC_CLIENT_CONN_ERROR_TIMEOUT, 0, NULL,
 338                  conn->callback_context);
 339
 340   silc_fsm_next(&conn->internal->event_thread, silc_client_st_connect_error);
 341   silc_fsm_continue_sync(&conn->internal->event_thread);
 342 }
 343
 344 /* Creates a connection to remote host */
 345
 346 SILC_FSM_STATE(silc_client_st_connect)
 347 {
 348   SilcClientConnection conn = fsm_context;
 349   SilcClient client = conn->client;
 350
 351   SILC_LOG_DEBUG(("Connecting to %s:%d", conn->remote_host,
 352                   conn->remote_port));
 353
 354   /** Connect */
 355   silc_fsm_next(fsm, silc_client_st_connect_set_stream);
 356
 357   /* Add connection timeout */
 358   if (conn->internal->params.timeout_secs)
 359     silc_schedule_task_add_timeout(conn->internal->schedule,
 360                                    silc_client_connect_timeout, conn,
 361                                    conn->internal->params.timeout_secs, 0);
 362
 363   if (conn->internal->params.udp) {
 364     SilcStream stream;
 365
 366     if (!conn->internal->params.local_ip) {
 367       /** IP address not given */
 368       SILC_LOG_ERROR(("Local UDP IP address not specified"));
 369       conn->callback(client, conn, SILC_CLIENT_CONN_ERROR, 0, NULL,
 370                      conn->callback_context);
 371       silc_fsm_next(fsm, silc_client_st_connect_error);
 372       return SILC_FSM_CONTINUE;
 373     }
 374
 375     /* Connect (UDP) */
 376     stream = silc_net_udp_connect(conn->internal->params.bind_ip ?
 377                                   conn->internal->params.bind_ip :
 378                                   conn->internal->params.local_ip,
 379                                   conn->internal->params.local_port,
 380                                   conn->remote_host, conn->remote_port,
 381                                   conn->internal->schedule);
 382
 383     SILC_FSM_CALL(silc_client_connect_callback(stream ? SILC_NET_OK :
 384                                                SILC_NET_HOST_UNREACHABLE,
 385                                                stream, fsm));
 386   } else {
 387     /* Connect (TCP) */
 388     SILC_FSM_CALL(conn->internal->op = silc_net_tcp_connect(
 389                                        NULL, conn->remote_host,
 390                                        conn->remote_port,
 391                                        conn->internal->schedule,
 392                                        silc_client_connect_callback, fsm));
 393   }
 394 }
 395
 396 /* Sets the new connection stream into use and creates packet stream */
 397
 398 SILC_FSM_STATE(silc_client_st_connect_set_stream)
 399 {
 400   SilcClientConnection conn = fsm_context;
 401   SilcClient client = conn->client;
 402
 403   /* Create packet stream */
 404   conn->stream = silc_packet_stream_create(client->internal->packet_engine,
 405                                            conn->internal->schedule,
 406                                            (SilcStream)conn->stream);
 407   if (!conn->stream) {
 408     /** Cannot create packet stream */
 409     SILC_LOG_DEBUG(("Could not create packet stream"));
 410     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR, 0, NULL,
 411                    conn->callback_context);
 412     silc_fsm_next(fsm, silc_client_st_connect_error);
 413     return SILC_FSM_CONTINUE;
 414   }
 415
 416   silc_packet_set_context(conn->stream, conn);
 417
 418   /** Start key exchange */
 419   silc_fsm_next(fsm, silc_client_st_connect_key_exchange);
 420   return SILC_FSM_CONTINUE;
 421 }
 422
 423 /* Starts key exchange protocol with remote host */
 424
 425 SILC_FSM_STATE(silc_client_st_connect_key_exchange)
 426 {
 427   SilcClientConnection conn = fsm_context;
 428   SilcClient client = conn->client;
 429   SilcSKEParamsStruct params;
 430
 431   SILC_LOG_DEBUG(("Starting key exchange protocol"));
 432
 433   /* Allocate SKE */
 434   conn->internal->ske =
 435     silc_ske_alloc(client->rng, conn->internal->schedule,
 436                    conn->internal->params.repository,
 437                    conn->public_key, conn->private_key, fsm);
 438   if (!conn->internal->ske) {
 439     /** Out of memory */
 440     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR_KE, 0, NULL,
 441                    conn->callback_context);
 442     silc_fsm_next(fsm, silc_client_st_connect_error);
 443     return SILC_FSM_CONTINUE;
 444   }
 445
 446   /* Set SKE callbacks */
 447   silc_ske_set_callbacks(conn->internal->ske, silc_client_ke_verify_key,
 448                          silc_client_ke_completion, fsm);
 449
 450   /* Set up key exchange parameters */
 451   params.version = client->internal->silc_client_version;
 452   params.flags = SILC_SKE_SP_FLAG_MUTUAL;
 453   if (conn->internal->params.pfs)
 454     params.flags |= SILC_SKE_SP_FLAG_PFS;
 455   if (conn->internal->params.udp) {
 456     params.flags |= SILC_SKE_SP_FLAG_IV_INCLUDED;
 457     params.session_port = conn->internal->params.local_port;
 458   }
 459
 460   if (conn->internal->params.no_authentication)
 461     /** Run key exchange (no auth) */
 462     silc_fsm_next(fsm, silc_client_st_connected);
 463   else if (conn->internal->params.udp)
 464     /** Run key exchange (UDP)*/
 465     silc_fsm_next(fsm, silc_client_st_connect_setup_udp);
 466   else
 467     /** Run key exchange (TCP) */
 468     silc_fsm_next(fsm, silc_client_st_connect_auth);
 469
 470   SILC_FSM_CALL(conn->internal->op = silc_ske_initiator(conn->internal->ske,
 471                                                         conn->stream,
 472                                                         &params, NULL));
 473 }
 474
 475 /* For UDP/IP connections, set up the UDP session after successful key
 476    exchange protocol */
 477
 478 SILC_FSM_STATE(silc_client_st_connect_setup_udp)
 479 {
 480   SilcClientConnection conn = fsm_context;
 481   SilcClient client = conn->client;
 482   SilcStream stream, old;
 483   SilcSKESecurityProperties prop;
 484
 485   SILC_LOG_DEBUG(("Setup UDP SILC session"));
 486
 487   /* Create new UDP stream */
 488   prop = silc_ske_get_security_properties(conn->internal->ske);
 489   stream = silc_net_udp_connect(conn->internal->params.local_ip,
 490                                 conn->internal->params.local_port,
 491                                 conn->remote_host, prop->remote_port,
 492                                 conn->internal->schedule);
 493   if (!stream) {
 494     /** Cannot create UDP stream */
 495     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR, 0, NULL,
 496                    conn->callback_context);
 497     silc_fsm_next(fsm, silc_client_st_connect_error);
 498     return SILC_FSM_CONTINUE;
 499   }
 500
 501   /* Set the new stream to packet stream */
 502   old = silc_packet_stream_get_stream(conn->stream);
 503   silc_packet_stream_set_stream(conn->stream, stream,
 504                                 conn->internal->schedule);
 505   silc_packet_stream_set_iv_included(conn->stream);
 506   silc_packet_set_sid(conn->stream, 0);
 507
 508   /* Delete the old stream */
 509   silc_stream_destroy(old);
 510
 511   /** Start authentication */
 512   silc_fsm_next(fsm, silc_client_st_connect_auth);
 513   return SILC_FSM_CONTINUE;
 514 }
 515
 516 /* Get authentication method to be used in authentication protocol */
 517
 518 SILC_FSM_STATE(silc_client_st_connect_auth)
 519 {
 520   SilcClientConnection conn = fsm_context;
 521   SilcClient client = conn->client;
 522
 523   SILC_LOG_DEBUG(("Get authentication data"));
 524
 525   silc_fsm_next(fsm, silc_client_st_connect_auth_start);
 526
 527   /* If authentication data not provided, ask from application */
 528   if (!conn->internal->params.auth_set)
 529     SILC_FSM_CALL(client->internal->ops->get_auth_method(
 530                                     client, conn,
 531                                     conn->remote_host,
 532                                     conn->remote_port,
 533                                     silc_client_connect_auth_method, fsm));
 534
 535   if (conn->internal->params.auth_method == SILC_AUTH_PUBLIC_KEY)
 536     conn->internal->params.auth = conn->private_key;
 537
 538   /* We have authentication data */
 539   return SILC_FSM_CONTINUE;
 540 }
 541
 542 /* Start connection authentication with remote host */
 543
 544 SILC_FSM_STATE(silc_client_st_connect_auth_start)
 545 {
 546   SilcClientConnection conn = fsm_context;
 547   SilcClient client = conn->client;
 548   SilcConnAuth connauth;
 549
 550   SILC_LOG_DEBUG(("Starting connection authentication protocol"));
 551
 552   /* Allocate connection authentication protocol */
 553   connauth = silc_connauth_alloc(conn->internal->schedule,
 554                                  conn->internal->ske,
 555                                  conn->internal->params.rekey_secs);
 556   if (!connauth) {
 557     /** Out of memory */
 558     conn->callback(client, conn, SILC_CLIENT_CONN_ERROR_AUTH, 0, NULL,
 559                    conn->callback_context);
 560     silc_fsm_next(fsm, silc_client_st_connect_error);
 561     return SILC_FSM_CONTINUE;
 562   }
 563
 564   /** Start connection authentication */
 565   silc_fsm_next(fsm, silc_client_st_connected);
 566   SILC_FSM_CALL(conn->internal->op = silc_connauth_initiator(
 567                                         connauth, SILC_CONN_CLIENT,
 568                                         conn->internal->params.auth_method,
 569                                         conn->internal->params.auth,
 570                                         conn->internal->params.auth_len,
 571                                         silc_client_connect_auth_completion,
 572                                         fsm));
 573 }
 574
 575 /* Connection fully established */
 576
 577 SILC_FSM_STATE(silc_client_st_connected)
 578 {
 579   SilcClientConnection conn = fsm_context;
 580   SilcClient client = conn->client;
 581
 582   SILC_LOG_DEBUG(("Connection established"));
 583
 584   silc_ske_free(conn->internal->ske);
 585   conn->internal->ske = NULL;
 586
 587   /* Install rekey timer */
 588   silc_schedule_task_add_timeout(conn->internal->schedule,
 589                                  silc_client_rekey_timer, conn,
 590                                  conn->internal->params.rekey_secs, 0);
 591
 592   /* If we connected to server, now register to network. */
 593   if (conn->type == SILC_CONN_SERVER &&
 594       !conn->internal->params.no_authentication) {
 595
 596     /* If detach data is provided, resume the session. */
 597     if (conn->internal->params.detach_data &&
 598         conn->internal->params.detach_data_len) {
 599       /** Resume detached session */
 600       silc_fsm_next(fsm, silc_client_st_resume);
 601     } else {
 602       /** Register to network */
 603       silc_fsm_next(fsm, silc_client_st_register);
 604     }
 605
 606     return SILC_FSM_CONTINUE;
 607   }
 608
 609   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 610                                 silc_client_connect_timeout, conn);
 611
 612   /* Call connection callback */
 613   conn->callback(client, conn, SILC_CLIENT_CONN_SUCCESS, 0, NULL,
 614                  conn->callback_context);
 615
 616   return SILC_FSM_FINISH;
 617 }
 618
 619 /* Error during connecting */
 620
 621 SILC_FSM_STATE(silc_client_st_connect_error)
 622 {
 623   SilcClientConnection conn = fsm_context;
 624
 625   if (conn->internal->ske) {
 626     silc_ske_free(conn->internal->ske);
 627     conn->internal->ske = NULL;
 628   }
 629
 630   /* Signal to close connection */
 631   if (!conn->internal->disconnected) {
 632     conn->internal->disconnected = TRUE;
 633     SILC_FSM_SEMA_POST(&conn->internal->wait_event);
 634   }
 635
 636   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 637                                 silc_client_connect_timeout, conn);
 638
 639   return SILC_FSM_FINISH;
 640 }
 641
 642 /****************************** Connect rekey *******************************/
 643
 644 /* Connection rekey timer callback */
 645
 646 SILC_TASK_CALLBACK(silc_client_rekey_timer)
 647 {
 648   SilcClientConnection conn = context;
 649
 650   /* Signal to start rekey */
 651   conn->internal->rekeying = TRUE;
 652   SILC_FSM_SEMA_POST(&conn->internal->wait_event);
 653
 654   /* Reinstall rekey timer */
 655   silc_schedule_task_add_timeout(conn->internal->schedule,
 656                                  silc_client_rekey_timer, conn,
 657                                  conn->internal->params.rekey_secs, 0);
 658 }
 659
 660 /* Performs rekey */
 661
 662 SILC_FSM_STATE(silc_client_st_rekey)
 663 {
 664   SilcClientConnection conn = fsm_context;
 665   SilcClient client = conn->client;
 666
 667   SILC_LOG_DEBUG(("Rekey"));
 668
 669   /* Allocate SKE */
 670   conn->internal->ske =
 671     silc_ske_alloc(client->rng, conn->internal->schedule,
 672                    conn->internal->params.repository,
 673                    conn->public_key, conn->private_key, fsm);
 674   if (!conn->internal->ske)
 675     return SILC_FSM_FINISH;
 676
 677   /* Set SKE callbacks */
 678   silc_ske_set_callbacks(conn->internal->ske, NULL,
 679                          silc_client_rekey_completion, fsm);
 680
 681   /** Perform rekey */
 682   if (!conn->internal->rekey_responder)
 683     SILC_FSM_CALL(conn->internal->op = silc_ske_rekey_initiator(
 684                                                     conn->internal->ske,
 685                                                     conn->stream,
 686                                                     conn->internal->rekey));
 687   else
 688     SILC_FSM_CALL(conn->internal->op = silc_ske_rekey_responder(
 689                                                     conn->internal->ske,
 690                                                     conn->stream,
 691                                                     conn->internal->rekey));
 692 }