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/*
* Copyright (C) 2012 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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 "fragment_payload.h"
#include <encoding/payloads/encodings.h>
/** Flag that is set in case the given fragment is the last for the message */
#define LAST_FRAGMENT 0x01
typedef struct private_fragment_payload_t private_fragment_payload_t;
/**
* Private data of an fragment_payload_t object.
*/
struct private_fragment_payload_t {
/**
* Public fragment_payload_t interface.
*/
fragment_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Reserved byte
*/
u_int8_t reserved;
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* Fragment ID.
*/
u_int16_t fragment_id;
/**
* Fragment number.
*/
u_int8_t fragment_number;
/**
* Flags
*/
u_int8_t flags;
/**
* The contained fragment data.
*/
chunk_t data;
};
/**
* Encoding rules for an IKEv1 fragment payload
*/
static encoding_rule_t encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_fragment_payload_t, next_payload) },
{ RESERVED_BYTE, offsetof(private_fragment_payload_t, reserved) },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH, offsetof(private_fragment_payload_t, payload_length) },
{ U_INT_16, offsetof(private_fragment_payload_t, fragment_id) },
{ U_INT_8, offsetof(private_fragment_payload_t, fragment_number) },
{ U_INT_8, offsetof(private_fragment_payload_t, flags) },
/* Fragment data is of variable size */
{ CHUNK_DATA, offsetof(private_fragment_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 ! RESERVED ! Payload Length !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Fragment ID ! Fragment Num ! Flags !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Fragment Data ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
METHOD(payload_t, verify, status_t,
private_fragment_payload_t *this)
{
if (this->fragment_number == 0)
{
return FAILED;
}
return SUCCESS;
}
METHOD(payload_t, get_encoding_rules, int,
private_fragment_payload_t *this, encoding_rule_t **rules)
{
*rules = encodings;
return countof(encodings);
}
METHOD(payload_t, get_header_length, int,
private_fragment_payload_t *this)
{
return 8;
}
METHOD(payload_t, get_type, payload_type_t,
private_fragment_payload_t *this)
{
return PLV1_FRAGMENT;
}
METHOD(payload_t, get_next_type, payload_type_t,
private_fragment_payload_t *this)
{
return this->next_payload;
}
METHOD(payload_t, set_next_type, void,
private_fragment_payload_t *this, payload_type_t type)
{
this->next_payload = type;
}
METHOD(payload_t, get_length, size_t,
private_fragment_payload_t *this)
{
return this->payload_length;
}
METHOD(fragment_payload_t, get_id, u_int16_t,
private_fragment_payload_t *this)
{
return this->fragment_id;
}
METHOD(fragment_payload_t, get_number, u_int8_t,
private_fragment_payload_t *this)
{
return this->fragment_number;
}
METHOD(fragment_payload_t, is_last, bool,
private_fragment_payload_t *this)
{
return (this->flags & LAST_FRAGMENT) == LAST_FRAGMENT;
}
METHOD(fragment_payload_t, get_data, chunk_t,
private_fragment_payload_t *this)
{
return this->data;
}
METHOD2(payload_t, fragment_payload_t, destroy, void,
private_fragment_payload_t *this)
{
free(this->data.ptr);
free(this);
}
/*
* Described in header
*/
fragment_payload_t *fragment_payload_create()
{
private_fragment_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_type,
.destroy = _destroy,
},
.get_id = _get_id,
.get_number = _get_number,
.is_last = _is_last,
.get_data = _get_data,
.destroy = _destroy,
},
.next_payload = PL_NONE,
);
this->payload_length = get_header_length(this);
return &this->public;
}
/*
* Described in header
*/
fragment_payload_t *fragment_payload_create_from_data(u_int8_t num, bool last,
chunk_t data)
{
private_fragment_payload_t *this;
this = (private_fragment_payload_t*)fragment_payload_create();
this->fragment_id = 1;
this->fragment_number = num;
this->flags |= (last ? LAST_FRAGMENT : 0);
this->data = chunk_clone(data);
this->payload_length = get_header_length(this) + data.len;
return &this->public;
}
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