Source/charon/message.c

   1 /**
   2  * @file message.c
   3  *
   4  * @brief Class message_t. Object of this type represents an IKEv2-Message.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2005 Jan Hutter, Martin Willi
  10  * Hochschule fuer Technik Rapperswil
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2 of the License, or (at your
  15  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  */
  22
  23 #include <stdlib.h>
  24
  25 #include "message.h"
  26
  27 #include "types.h"
  28 #include "globals.h"
  29 #include "ike_sa_id.h"
  30 #include "generator.h"
  31 #include "utils/linked_list.h"
  32 #include "utils/allocator.h"
  33 #include "utils/logger_manager.h"
  34 #include "payloads/encodings.h"
  35 #include "payloads/payload.h"
  36 #include "parser.h"
  37
  38
  39 /**
  40  * Supported payload entry used in message_rule_t
  41  *
  42  */
  43 typedef struct supported_payload_entry_s supported_payload_entry_t;
  44
  45 struct supported_payload_entry_s {
  46         /**
  47          * Payload type
  48          */
  49          payload_type_t payload_type;
  50
  51          /**
  52           * Minimal occurence of this payload
  53           */
  54          size_t min_occurence;
  55
  56          /**
  57           * Max occurence of this payload
  58           */
  59          size_t max_occurence;
  60 };
  61
  62 /**
  63  * Message Rule used to find out which payloads are supported by each message type
  64  *
  65  */
  66 typedef struct message_rule_s message_rule_t;
  67
  68 struct message_rule_s {
  69         /**
  70          * Type of message
  71          */
  72         exchange_type_t exchange_type;
  73
  74         /**
  75          * Is message a request or response
  76          */
  77         bool is_request;
  78          /**
  79           * Number of supported payloads
  80           */
  81          size_t supported_payloads_count;
  82         /**
  83          * Pointer to first supported payload entry
  84          */
  85          supported_payload_entry_t *supported_payloads;
  86 };
  87
  88
  89 static supported_payload_entry_t supported_ike_sa_init_i_payloads[] =
  90 {
  91         {SECURITY_ASSOCIATION,1,1},
  92         {KEY_EXCHANGE,1,1},
  93         {NONCE,1,1},
  94 };
  95
  96 static supported_payload_entry_t supported_ike_sa_init_r_payloads[] =
  97 {
  98         {SECURITY_ASSOCIATION,1,1},
  99         {KEY_EXCHANGE,1,1},
 100         {NONCE,1,1},
 101 };
 102
 103 static message_rule_t message_rules[] = {
 104         {IKE_SA_INIT,TRUE,(sizeof(supported_ike_sa_init_i_payloads)/sizeof(supported_payload_entry_t)),supported_ike_sa_init_i_payloads},
 105         {IKE_SA_INIT,FALSE,(sizeof(supported_ike_sa_init_r_payloads)/sizeof(supported_payload_entry_t)),supported_ike_sa_init_r_payloads}
 106 };
 107
 108 /**
 109  * Entry for a payload in the internal used linked list
 110  *
 111  */
 112 typedef struct payload_entry_s payload_entry_t;
 113
 114 struct payload_entry_s {
 115         /**
 116          * Type of payload
 117          */
 118         payload_type_t payload_type;
 119         /**
 120          * Data struct holding the data of given payload
 121          */
 122         void *data_struct;
 123 };
 124
 125
 126 /**
 127  * Private data of an message_t object
 128  */
 129 typedef struct private_message_s private_message_t;
 130
 131 struct private_message_s {
 132
 133         /**
 134          * Public part of a message_t object
 135          */
 136         message_t public;
 137
 138
 139         /**
 140          * Minor version of message
 141          */
 142         u_int8_t major_version;
 143
 144         /**
 145          * Major version of message
 146          */
 147         u_int8_t minor_version;
 148
 149         /**
 150          * First Payload in message
 151          */
 152         payload_type_t first_payload;
 153
 154         /**
 155          * Assigned exchange type
 156          */
 157         exchange_type_t exchange_type;
 158
 159         /**
 160          * TRUE if message is from original initiator, FALSE otherwise.
 161          */
 162         bool original_initiator;
 163
 164         /**
 165          * TRUE if message is request.
 166          * FALSE if message is reply.
 167          */
 168         bool is_request;
 169
 170         /**
 171          * Message ID of this message
 172          */
 173         u_int32_t message_id;
 174
 175         /**
 176          * ID of assigned IKE_SA
 177          */
 178         ike_sa_id_t *ike_sa_id;
 179
 180         /**
 181          * Assigned UDP packet.
 182          *
 183          * Stores incoming packet or last generated one.
 184          */
 185         packet_t *packet;
 186
 187         /**
 188          * Linked List where payload data are stored in
 189          */
 190         linked_list_t *payloads;
 191
 192          /**
 193           * Assigned parser to parse Header and Body of this message
 194           */
 195         parser_t *parser;
 196
 197         /**
 198          * logger for this message
 199          */
 200         logger_t *logger;
 201
 202         /**
 203          * Gets a list of supported payloads of this message type
 204          *
 205          * @param this                                                  calling object
 206          * @param[out] supported_payloads               first entry of supported payloads
 207          * @param[out] supported_payloads_count number of supported payload entries
 208          *
 209          * @return                                                              SUCCESS
 210          *                                                                              NOT_FOUND if no supported payload definition could be found
 211          */
 212         status_t (*get_supported_payloads) (private_message_t *this, supported_payload_entry_t **supported_payloads,size_t *supported_payloads_count);
 213
 214 };
 215
 216 /**
 217  * Implements private_message_t's get_supported_payloads function.
 218  * See #private_message_t.get_supported_payloads.
 219  */
 220 status_t get_supported_payloads (private_message_t *this, supported_payload_entry_t **supported_payloads,size_t *supported_payloads_count)
 221 {
 222         int i;
 223         exchange_type_t exchange_type = this->public.get_exchange_type(&(this->public));
 224         bool is_request = this->public.get_request(&(this->public));
 225
 226
 227         for (i = 0; i < (sizeof(message_rules) / sizeof(message_rule_t)); i++)
 228         {
 229                 if ((exchange_type == message_rules[i].exchange_type) &&
 230                         (is_request == message_rules[i].is_request))
 231                 {
 232                         /* found rule for given exchange_type*/
 233                         *supported_payloads = message_rules[i].supported_payloads;
 234                         *supported_payloads_count = message_rules[i].supported_payloads_count;
 235
 236                         return SUCCESS;
 237                 }
 238
 239
 240         }
 241         *supported_payloads = NULL;
 242         *supported_payloads_count = 0;
 243         return NOT_FOUND;
 244 }
 245
 246 /**
 247  * Implements message_t's set_ike_sa_id function.
 248  * See #message_s.set_ike_sa_id.
 249  */
 250 static status_t set_ike_sa_id (private_message_t *this,ike_sa_id_t *ike_sa_id)
 251 {
 252         status_t status;
 253         status = ike_sa_id->clone(ike_sa_id,&(this->ike_sa_id));
 254         return status;
 255 }
 256
 257 /**
 258  * Implements message_t's get_ike_sa_id function.
 259  * See #message_s.get_ike_sa_id.
 260  */
 261 static status_t get_ike_sa_id (private_message_t *this,ike_sa_id_t **ike_sa_id)
 262 {
 263         status_t status;
 264         if (this->ike_sa_id == NULL)
 265         {
 266                 return FAILED;
 267         }
 268         status = this->ike_sa_id->clone(this->ike_sa_id,ike_sa_id);
 269         return status;
 270 }
 271
 272
 273 /**
 274  * Implements message_t's set_message_id function.
 275  * See #message_s.set_message_id.
 276  */
 277 static status_t set_message_id (private_message_t *this,u_int32_t message_id)
 278 {
 279         this->message_id = message_id;
 280         return SUCCESS;
 281 }
 282
 283
 284 /**
 285  * Implements message_t's set_message_id function.
 286  * See #message_s.set_message_id.
 287  */
 288 static u_int32_t get_message_id (private_message_t *this)
 289 {
 290         return this->message_id;
 291 }
 292
 293 /**
 294  * Implements message_t's set_major_version function.
 295  * See #message_s.set_major_version.
 296  */
 297 static status_t set_major_version (private_message_t *this,u_int8_t major_version)
 298 {
 299         this->major_version = major_version;
 300         return SUCCESS;
 301 }
 302
 303
 304 /**
 305  * Implements message_t's get_major_version function.
 306  * See #message_s.get_major_version.
 307  */
 308 static u_int8_t get_major_version (private_message_t *this)
 309 {
 310         return this->major_version;
 311 }
 312
 313 /**
 314  * Implements message_t's set_minor_version function.
 315  * See #message_s.set_minor_version.
 316  */
 317 static status_t set_minor_version (private_message_t *this,u_int8_t minor_version)
 318 {
 319         this->minor_version = minor_version;
 320         return SUCCESS;
 321 }
 322
 323
 324 /**
 325  * Implements message_t's get_minor_version function.
 326  * See #message_s.get_minor_version.
 327  */
 328 static u_int8_t get_minor_version (private_message_t *this)
 329 {
 330         return this->minor_version;
 331 }
 332
 333 /**
 334  * Implements message_t's set_exchange_type function.
 335  * See #message_s.set_exchange_type.
 336  */
 337 static status_t set_exchange_type (private_message_t *this,exchange_type_t exchange_type)
 338 {
 339         this->exchange_type = exchange_type;
 340         return SUCCESS;
 341 }
 342
 343
 344 /**
 345  * Implements message_t's get_exchange_type function.
 346  * See #message_s.get_exchange_type.
 347  */
 348 static exchange_type_t get_exchange_type (private_message_t *this)
 349 {
 350         return this->exchange_type;
 351 }
 352
 353 /**
 354  * Implements message_t's set_original_initiator function.
 355  * See #message_s.set_original_initiator.
 356  */
 357 static status_t set_original_initiator (private_message_t *this,bool original_initiator)
 358 {
 359         this->original_initiator = original_initiator;
 360         return SUCCESS;
 361 }
 362
 363 /**
 364  * Implements message_t's get_original_initiator function.
 365  * See #message_s.get_original_initiator.
 366  */
 367 static exchange_type_t get_original_initiator (private_message_t *this)
 368 {
 369         return this->original_initiator;
 370 }
 371
 372 /**
 373  * Implements message_t's set_request function.
 374  * See #message_s.set_request.
 375  */
 376 static status_t set_request (private_message_t *this,bool request)
 377 {
 378         this->is_request = request;
 379         return SUCCESS;
 380 }
 381
 382 /**
 383  * Implements message_t's get_request function.
 384  * See #message_s.get_request.
 385  */
 386 static exchange_type_t get_request (private_message_t *this)
 387 {
 388         return this->is_request;
 389 }
 390
 391 static status_t add_payload(private_message_t *this, payload_t *payload)
 392 {
 393         if (this->payloads->insert_last(this->payloads, payload) != SUCCESS)
 394         {
 395                 return OUT_OF_RES;
 396         }
 397         return SUCCESS;
 398 }
 399
 400 static status_t set_source(private_message_t *this, host_t *host)
 401 {
 402         if (this->packet->source != NULL)
 403         {
 404                 this->packet->source->destroy(this->packet->source);
 405         }
 406         this->packet->source = host;
 407         return SUCCESS;
 408 }
 409
 410 static status_t set_destination(private_message_t *this, host_t *host)
 411 {
 412         if (this->packet->destination != NULL)
 413         {
 414                 this->packet->destination->destroy(this->packet->destination);
 415         }
 416         this->packet->destination = host;
 417         return SUCCESS;
 418 }
 419
 420 static status_t get_source(private_message_t *this, host_t **host)
 421 {
 422         *host = this->packet->source;
 423         return SUCCESS;
 424 }
 425
 426 static status_t get_destination(private_message_t *this, host_t **host)
 427 {
 428         *host = this->packet->destination;
 429         return SUCCESS;
 430 }
 431
 432
 433 /**
 434  * Implements message_t's generate function.
 435  * See #message_s.generate.
 436  */
 437 static status_t generate(private_message_t *this, packet_t **packet)
 438 {
 439         generator_t *generator;
 440         ike_header_t *ike_header;
 441         payload_t *payload, *next_payload;
 442         linked_list_iterator_t *iterator;
 443         u_int64_t initiator_spi, responder_spi;
 444         bool is_initiator;
 445         status_t status;
 446
 447         if (this->exchange_type == EXCHANGE_TYPE_UNDEFINED)
 448         {
 449                 return INVALID_STATE;
 450         }
 451
 452         if (this->packet->source == NULL ||
 453                 this->packet->destination == NULL)
 454         {
 455                 return INVALID_STATE;
 456         }
 457
 458         ike_header = ike_header_create();
 459         if (ike_header == NULL)
 460         {
 461                 return OUT_OF_RES;
 462         }
 463
 464         this->ike_sa_id->get_values(this->ike_sa_id, &initiator_spi, &responder_spi, &is_initiator);
 465
 466         ike_header->set_exchange_type(ike_header, this->exchange_type);
 467         ike_header->set_initiator_flag(ike_header, this->original_initiator);
 468         ike_header->set_message_id(ike_header, this->message_id);
 469         ike_header->set_response_flag(ike_header, !this->is_request);
 470         ike_header->set_initiator_flag(ike_header, is_initiator);
 471         ike_header->set_initiator_spi(ike_header, initiator_spi);
 472         ike_header->set_responder_spi(ike_header, responder_spi);
 473
 474         generator = generator_create();
 475         if (generator == NULL)
 476         {
 477                 return OUT_OF_RES;
 478         }
 479
 480         payload = (payload_t*)ike_header;
 481
 482         if (this->payloads->create_iterator(this->payloads, &iterator, TRUE) != SUCCESS)
 483         {
 484                 generator->destroy(generator);
 485                 ike_header->destroy(ike_header);
 486                 return OUT_OF_RES;
 487         }
 488         while(iterator->has_next(iterator))
 489         {
 490                 iterator->current(iterator, (void**)&next_payload);
 491                 payload->set_next_type(payload, next_payload->get_type(next_payload));
 492                 status = generator->generate_payload(generator, payload);
 493                 if (status != SUCCESS)
 494                 {
 495                         generator->destroy(generator);
 496                         ike_header->destroy(ike_header);
 497                         return status;
 498                 }
 499                 payload = next_payload;
 500         }
 501         iterator->destroy(iterator);
 502
 503         payload->set_next_type(payload, NO_PAYLOAD);
 504         status = generator->generate_payload(generator, payload);
 505         if (status != SUCCESS)
 506         {
 507                 generator->destroy(generator);
 508                 ike_header->destroy(ike_header);
 509                 return status;
 510         }
 511
 512         ike_header->destroy(ike_header);
 513
 514
 515
 516         if (this->packet->data.ptr != NULL)
 517         {
 518                 allocator_free(this->packet->data.ptr);
 519         }
 520
 521         status = generator->write_to_chunk(generator, &(this->packet->data));
 522         if (status != SUCCESS)
 523         {
 524                 generator->destroy(generator);
 525                 return status;
 526         }
 527
 528         this->packet->clone(this->packet, packet);
 529
 530         generator->destroy(generator);
 531         return SUCCESS;
 532 }
 533
 534 /**
 535  * Implements message_t's parse_header function.
 536  * See #message_s.parse_header.
 537  */
 538 static status_t parse_header (private_message_t *this)
 539 {
 540         ike_header_t *ike_header;
 541         status_t status;
 542
 543         this->parser->reset_context(this->parser);
 544         status = this->parser->parse_payload(this->parser,HEADER,(payload_t **) &ike_header);
 545         if (status != SUCCESS)
 546         {
 547                 this->logger->log(this->logger, ERROR, "Header could not be parsed");
 548                 return status;
 549
 550         }
 551
 552         /* verify payload */
 553         status = ike_header->payload_interface.verify(&(ike_header->payload_interface));
 554         if (status != SUCCESS)
 555         {
 556                 this->logger->log(this->logger, ERROR, "Header could not be verified");
 557                 return status;
 558         }
 559
 560         if (this->ike_sa_id != NULL)
 561         {
 562                 this->ike_sa_id->destroy(this->ike_sa_id);
 563         }
 564         this->original_initiator = (!ike_header->get_initiator_flag(ike_header));
 565
 566         this->ike_sa_id = ike_sa_id_create(ike_header->get_initiator_spi(ike_header),ike_header->get_responder_spi(ike_header),this->original_initiator);
 567         if (this->ike_sa_id == NULL)
 568         {
 569                 this->logger->log(this->logger, ERROR, "Could not creaee ike_sa_id object");
 570                 ike_header->destroy(ike_header);
 571                 return OUT_OF_RES;
 572         }
 573         this->exchange_type = ike_header->get_exchange_type(ike_header);
 574         this->message_id = ike_header->get_message_id(ike_header);
 575         this->is_request = (!(ike_header->get_response_flag(ike_header)));
 576         this->major_version = ike_header->get_maj_version(ike_header);
 577         this->minor_version = ike_header->get_min_version(ike_header);
 578         this->first_payload = ike_header->payload_interface.get_next_type(&(ike_header->payload_interface));
 579
 580         ike_header->destroy(ike_header);
 581         return SUCCESS;
 582 }
 583
 584 /**
 585  * Implements message_t's parse_body function.
 586  * See #message_s.parse_body.
 587  */
 588 static status_t parse_body (private_message_t *this)
 589 {
 590         status_t status;
 591         int i;
 592         payload_type_t current_payload_type = this->first_payload;
 593         supported_payload_entry_t *supported_payloads;
 594         size_t supported_payloads_count;
 595
 596         if (this->get_supported_payloads (this,&supported_payloads,&supported_payloads_count) != SUCCESS)
 597         {
 598                 /* message type is not supported */
 599                 return FAILED;
 600         }
 601
 602         while (current_payload_type != NO_PAYLOAD)
 603         {
 604                 payload_t *current_payload;
 605
 606                 bool supported = FALSE;
 607                 for (i = 0; i < supported_payloads_count;i++)
 608                 {
 609                         if (supported_payloads[i].payload_type == current_payload_type)
 610                         {
 611                                 supported = TRUE;
 612                                 break;
 613                         }
 614                 }
 615                 if (!supported && (current_payload_type != NO_PAYLOAD))
 616                 {
 617                         /* type not supported */
 618                         status = NOT_SUPPORTED;
 619                         this->logger->log(this->logger, ERROR, "Payload type %s not supported",mapping_find(payload_type_m,current_payload_type));
 620                         break;
 621                 }
 622
 623                 status = this->parser->parse_payload(this->parser,current_payload_type,(payload_t **) &current_payload);
 624                 if (status != SUCCESS)
 625                 {
 626                         this->logger->log(this->logger, ERROR, "Payload type %s could not be parsed",mapping_find(payload_type_m,current_payload_type));
 627                         break;
 628                 }
 629
 630                 current_payload_type = current_payload->get_next_type(current_payload);
 631
 632                 status = current_payload->verify(current_payload);
 633                 if (status != SUCCESS)
 634                 {
 635                         this->logger->log(this->logger, ERROR, "Payload type %s could not be verified",mapping_find(payload_type_m,current_payload_type));
 636                         status = VERIFY_ERROR;
 637                         break;
 638                 }
 639
 640                 status = this->payloads->insert_last(this->payloads,current_payload);
 641                 if (status != SUCCESS)
 642                 {
 643                         this->logger->log(this->logger, ERROR, "Could not insert current payload to internal list cause of ressource exhausting");
 644                         break;
 645                 }
 646
 647         }
 648         if (status != SUCCESS)
 649         {
 650                 /* already parsed payload is destroyed later in destroy call from outside this object */
 651         }
 652         else
 653         {
 654                 linked_list_iterator_t *iterator;
 655
 656                 status = this->payloads->create_iterator(this->payloads,&iterator,TRUE);
 657                 if (status != SUCCESS)
 658                 {
 659                         this->logger->log(this->logger, ERROR, "Could not create iterator to check supported payloads");
 660                         return status;
 661                 }
 662
 663
 664                 /* check for payloads with wrong count*/
 665                 for (i = 0; i < supported_payloads_count;i++)
 666                 {
 667                         size_t min_occurence = supported_payloads[i].min_occurence;
 668                         size_t max_occurence = supported_payloads[i].max_occurence;
 669                         payload_type_t payload_type = supported_payloads[i].payload_type;
 670                         size_t found_payloads = 0;
 671
 672                         iterator->reset(iterator);
 673
 674                         while(iterator->has_next(iterator))
 675                         {
 676                                 payload_t *current_payload;
 677                                 status = iterator->current(iterator,(void **)&current_payload);
 678                                 if (status != SUCCESS)
 679                                 {
 680                                         this->logger->log(this->logger, CONTROL_MORE, "Could not get payload from internal list");
 681                                         iterator->destroy(iterator);
 682                                         return status;
 683                                 }
 684                                 if (current_payload->get_type(current_payload) == payload_type)
 685                                 {
 686                                         found_payloads++;
 687                                         if (found_payloads > max_occurence)
 688                                         {
 689                                                 this->logger->log(this->logger, CONTROL_MORE, "Payload of type %s more than %d times (%d) occured in current message",
 690                                                                                   mapping_find(payload_type_m,current_payload->get_type(current_payload)),max_occurence,found_payloads);
 691                                                 iterator->destroy(iterator);
 692                                                 return NOT_SUPPORTED;
 693                                         }
 694                                 }
 695
 696                         }
 697                         if (found_payloads < min_occurence)
 698                         {
 699                                         this->logger->log(this->logger, CONTROL_MORE, "Payload of type %s not occured %d times",
 700                                                                           mapping_find(payload_type_m,payload_type),min_occurence);
 701                                         iterator->destroy(iterator);
 702                                         return NOT_SUPPORTED;
 703                         }
 704
 705                 }
 706                 iterator->destroy(iterator);
 707         }
 708         return status;
 709 }
 710
 711
 712
 713 /**
 714  * Implements message_t's destroy function.
 715  * See #message_s.destroy.
 716  */
 717 static status_t destroy (private_message_t *this)
 718 {
 719         linked_list_iterator_t *iterator;
 720
 721         if (this->packet != NULL)
 722         {
 723                 this->packet->destroy(this->packet);
 724         }
 725         if (this->ike_sa_id != NULL)
 726         {
 727                 this->ike_sa_id->destroy(this->ike_sa_id);
 728         }
 729
 730         this->payloads->create_iterator(this->payloads, &iterator, TRUE);
 731         while (iterator->has_next(iterator))
 732         {
 733                 payload_t *payload;
 734                 iterator->current(iterator, (void**)&payload);
 735                 this->logger->log(this->logger, CONTROL_MORE, "Destroying payload of type %s",
 736                         mapping_find(payload_type_m, payload->get_type(payload)));
 737                 payload->destroy(payload);
 738         }
 739         iterator->destroy(iterator);
 740         this->payloads->destroy(this->payloads);
 741         this->parser->destroy(this->parser);
 742
 743 allocator_free(this);
 744         return SUCCESS;
 745 }
 746
 747 /*
 748  * Described in Header-File
 749  */
 750 message_t *message_create_from_packet(packet_t *packet)
 751 {
 752         private_message_t *this = allocator_alloc_thing(private_message_t);
 753         if (this == NULL)
 754         {
 755                 return NULL;
 756         }
 757
 758         /* public functions */
 759         this->public.set_major_version = (status_t(*)(message_t*, u_int8_t))set_major_version;
 760         this->public.get_major_version = (u_int8_t(*)(message_t*))get_major_version;
 761         this->public.set_minor_version = (status_t(*)(message_t*, u_int8_t))set_minor_version;
 762         this->public.get_minor_version = (u_int8_t(*)(message_t*))get_minor_version;
 763         this->public.set_message_id = (status_t(*)(message_t*, u_int32_t))set_message_id;
 764         this->public.get_message_id = (u_int32_t(*)(message_t*))get_message_id;
 765         this->public.set_ike_sa_id = (status_t(*)(message_t*, ike_sa_id_t *))set_ike_sa_id;
 766         this->public.get_ike_sa_id = (status_t(*)(message_t*, ike_sa_id_t **))get_ike_sa_id;
 767         this->public.set_exchange_type = (status_t(*)(message_t*, exchange_type_t))set_exchange_type;
 768         this->public.get_exchange_type = (exchange_type_t(*)(message_t*))get_exchange_type;
 769         this->public.set_original_initiator = (status_t(*)(message_t*, bool))set_original_initiator;
 770         this->public.get_original_initiator = (bool(*)(message_t*))get_original_initiator;
 771         this->public.set_request = (status_t(*)(message_t*, bool))set_request;
 772         this->public.get_request = (bool(*)(message_t*))get_request;
 773         this->public.add_payload = (status_t(*)(message_t*,payload_t*))add_payload;
 774         this->public.generate = (status_t (*) (message_t *, packet_t**)) generate;
 775         this->public.set_source = (status_t (*) (message_t*,host_t*)) set_source;
 776         this->public.get_source = (status_t (*) (message_t*,host_t**)) get_source;
 777         this->public.set_destination = (status_t (*) (message_t*,host_t*)) set_destination;
 778         this->public.get_destination = (status_t (*) (message_t*,host_t**)) get_destination;
 779         this->public.parse_header =     (status_t (*) (message_t *)) parse_header;
 780         this->public.parse_body =       (status_t (*) (message_t *)) parse_body;
 781         this->public.destroy = (status_t(*)(message_t*))destroy;
 782
 783         /* public values */
 784         this->exchange_type = EXCHANGE_TYPE_UNDEFINED;
 785         this->original_initiator = TRUE;
 786         this->is_request = TRUE;
 787         this->ike_sa_id = NULL;
 788         this->first_payload = NO_PAYLOAD;
 789         this->message_id = 0;
 790
 791         /* private functions */
 792         this->get_supported_payloads = get_supported_payloads;
 793
 794         /* private values */
 795         if (packet == NULL)
 796         {
 797                 packet = packet_create();
 798         }
 799         if (packet == NULL)
 800         {
 801                 allocator_free(this);
 802                 return NULL;
 803         }
 804         this->packet = packet;
 805         this->payloads = linked_list_create();
 806         if (this->payloads == NULL)
 807         {
 808                 allocator_free(this);
 809                 return NULL;
 810         }
 811
 812         /* parser is created from data of packet */
 813         this->parser = parser_create(this->packet->data);
 814         if (this->parser == NULL)
 815         {
 816                 this->payloads->destroy(this->payloads);
 817                 allocator_free(this);
 818                 return NULL;
 819         }
 820
 821         this->logger = global_logger_manager->create_logger(global_logger_manager, MESSAGE, NULL);
 822         if (this->logger == NULL)
 823         {
 824                 this->parser->destroy(this->parser);
 825                 this->payloads->destroy(this->payloads);
 826                 allocator_free(this);
 827                 return NULL;
 828         }
 829
 830         return (&this->public);
 831 }
 832
 833 /*
 834  * Described in Header-File
 835  */
 836 message_t *message_create()
 837 {
 838         return message_create_from_packet(NULL);
 839 }