/*

 * Copyright (C) 2015 Tobias Brunner

 * Copyright (C) 2005-2006 Martin Willi

 * Copyright (C) 2005 Jan Hutter

 *

 * Copyright (C) secunet Security Networks AG

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the

 * Free Software Foundation; either version 2 of the License, or (at your

 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * for more details.

 */

#include <stddef.h>

#include "unknown_payload.h"

typedef struct private_unknown_payload_t private_unknown_payload_t;

/**

 * Private data of an unknown_payload_t object.

 */

struct private_unknown_payload_t {

  /**

   * Public unknown_payload_t interface.

   */

  unknown_payload_t public;

  /**

   * Type of this payload

   */

  payload_type_t type;

  /**

   * Next payload type.

   */

  uint8_t next_payload;

  /**

   * Critical flag.

   */

  bool critical;

  /**

   * Reserved bits

   */

  bool reserved[7];

  /**

   * Length of this payload.

   */

  uint16_t payload_length;

  /**

   * The contained data.

   */

  chunk_t data;

};

/**

 * Encoding rules to parse an payload which is not further specified.

 *

 * The defined offsets are the positions in a object of type

 * private_unknown_payload_t.

 *

 */

static encoding_rule_t encodings[] = {

  /* 1 Byte next payload type, stored in the field next_payload */

  { U_INT_8,      offsetof(private_unknown_payload_t, next_payload) },

  /* the critical bit */

  { FLAG,       offsetof(private_unknown_payload_t, critical)   },

  /* 7 Bit reserved bits */

  { RESERVED_BIT,   offsetof(private_unknown_payload_t, reserved[0])  },

  { RESERVED_BIT,   offsetof(private_unknown_payload_t, reserved[1])  },

  { RESERVED_BIT,   offsetof(private_unknown_payload_t, reserved[2])  },

  { RESERVED_BIT,   offsetof(private_unknown_payload_t, reserved[3])  },

  { RESERVED_BIT,   offsetof(private_unknown_payload_t, reserved[4])  },

  { RESERVED_BIT,   offsetof(private_unknown_payload_t, reserved[5])  },

  { RESERVED_BIT,   offsetof(private_unknown_payload_t, reserved[6])  },

  /* Length of the whole payload*/

  { PAYLOAD_LENGTH, offsetof(private_unknown_payload_t, payload_length) },

  /* some unknown data bytes, length is defined in PAYLOAD_LENGTH */

  { CHUNK_DATA,   offsetof(private_unknown_payload_t, data)     },

};

/*

                           1                   2                   3

        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       ! Next Payload  !C!  RESERVED   !         Payload Length        !

       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       !                                                               !

       ~                       Data of any type                        ~

       !                                                               !

       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

*/

METHOD(payload_t, verify, status_t,

  private_unknown_payload_t *this)

{

  return SUCCESS;

}

METHOD(payload_t, get_encoding_rules, int,

  private_unknown_payload_t *this, encoding_rule_t **rules)

{

  *rules = encodings;

  return countof(encodings);

}

METHOD(payload_t, get_header_length, int,

  private_unknown_payload_t *this)

{

  return 4;

}

METHOD(payload_t, get_payload_type, payload_type_t,

  private_unknown_payload_t *this)

{

  return PL_UNKNOWN;

}

METHOD(unknown_payload_t, get_type, payload_type_t,

  private_unknown_payload_t *this)

{

  return this->type;

}

METHOD(payload_t, get_next_type, payload_type_t,

  private_unknown_payload_t *this)

{

  return this->next_payload;

}

METHOD(payload_t, set_next_type, void,

  private_unknown_payload_t *this,payload_type_t type)

{

  this->next_payload = type;

}

METHOD(payload_t, get_length, size_t,

  private_unknown_payload_t *this)

{

  return this->payload_length;

}

METHOD(unknown_payload_t, is_critical, bool,

  private_unknown_payload_t *this)

{

  return this->critical;

}

METHOD(unknown_payload_t, get_data, chunk_t,

  private_unknown_payload_t *this)

{

  return this->data;

}

METHOD2(payload_t, unknown_payload_t, destroy, void,

  private_unknown_payload_t *this)

{

  free(this->data.ptr);

  free(this);

}

/*

 * Described in header

 */

unknown_payload_t *unknown_payload_create(payload_type_t type)

{

  private_unknown_payload_t *this;

  INIT(this,

    .public = {

      .payload_interface = {

        .verify = _verify,

        .get_encoding_rules = _get_encoding_rules,

        .get_header_length = _get_header_length,

        .get_length = _get_length,

        .get_next_type = _get_next_type,

        .set_next_type = _set_next_type,

        .get_type = _get_payload_type,

        .destroy = _destroy,

      },

      .is_critical = _is_critical,

      .get_type = _get_type,

      .get_data = _get_data,

      .destroy = _destroy,

    },

    .next_payload = PL_NONE,

    .payload_length = get_header_length(this),

    .type = type,

  );

  return &this->public;

}

/*

 * Described in header

 */

unknown_payload_t *unknown_payload_create_data(payload_type_t type,

                         bool critical, chunk_t data)

{

  private_unknown_payload_t *this;

  this = (private_unknown_payload_t*)unknown_payload_create(type);

  this->data = data;

  this->critical = critical;

  this->payload_length = get_header_length(this) + data.len;

  return &this->public;

}