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/**
* @file nonce_payload.h
*
* @brief Declaration of the class nonce_payload_t.
*
* An object of this type represents an IKEv2 Nonce-Payload.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* 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.
*/
/* offsetof macro */
#include <stddef.h>
#include "nonce_payload.h"
#include <encoding/payloads/encodings.h>
#include <utils/allocator.h>
/**
* Private data of an nonce_payload_t' Object
*
*/
typedef struct private_nonce_payload_s private_nonce_payload_t;
struct private_nonce_payload_s {
/**
* public nonce_payload_t interface
*/
nonce_payload_t public;
/**
* next payload type
*/
u_int8_t next_payload;
/**
* Critical flag
*/
bool critical;
/**
* Length of this payload
*/
u_int16_t payload_length;
/**
* the contained nonce value
*/
chunk_t nonce;
/**
* @brief Computes the length of this payload.
*
* @param this calling private_nonce_payload_t object
* @return
* SUCCESS in any case
*/
status_t (*compute_length) (private_nonce_payload_t *this);
};
/**
* Encoding rules to parse or generate a nonce payload
*
* The defined offsets are the positions in a object of type
* private_nonce_payload_t.
*
*/
encoding_rule_t nonce_payload_encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_nonce_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_nonce_payload_t, critical) },
/* 7 Bit reserved bits, nowhere stored */
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
/* Length of the whole nonce payload*/
{ PAYLOAD_LENGTH, offsetof(private_nonce_payload_t, payload_length) },
/* some nonce bytes, lenth is defined in PAYLOAD_LENGTH */
{ NONCE_DATA, offsetof(private_nonce_payload_t, nonce) }
};
/* 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 !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Nonce Data ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/**
* Implements payload_t's verify function.
* See #payload_s.verify for description.
*/
static status_t verify(private_nonce_payload_t *this)
{
if (this->critical)
{
/* critical bit is set! */
return FAILED;
}
if ((this->nonce.len < 16) || ((this->nonce.len > 256)))
{
/* nonce length is wrong */
return FAILED;
}
return SUCCESS;
}
/**
* Implements nonce_payload_t's set_nonce function.
* See #nonce_payload_t.set_nonce for description.
*/
static status_t set_nonce(private_nonce_payload_t *this, chunk_t nonce)
{
if (nonce.len >= 16 && nonce.len <= 256)
{
this->nonce.ptr = allocator_clone_bytes(nonce.ptr, nonce.len);
if (this->nonce.ptr == NULL)
{
return OUT_OF_RES;
}
this->nonce.len = nonce.len;
this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH + nonce.len;
return SUCCESS;
}
return INVALID_ARG;
}
/**
* Implements nonce_payload_t's get_nonce function.
* See #nonce_payload_t.get_nonce for description.
*/
static status_t get_nonce(private_nonce_payload_t *this, chunk_t *nonce)
{
nonce->ptr = allocator_clone_bytes(this->nonce.ptr,this->nonce.len);
if (nonce->ptr == NULL)
{
return OUT_OF_RES;
}
nonce->len = this->nonce.len;
return SUCCESS;
}
/**
* Implements payload_t's get_encoding_rules function.
* See #payload_s.get_encoding_rules for description.
*/
static status_t get_encoding_rules(private_nonce_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = nonce_payload_encodings;
*rule_count = sizeof(nonce_payload_encodings) / sizeof(encoding_rule_t);
return SUCCESS;
}
/**
* Implements payload_t's get_type function.
* See #payload_s.get_type for description.
*/
static payload_type_t get_type(private_nonce_payload_t *this)
{
return NONCE;
}
/**
* Implements payload_t's get_next_type function.
* See #payload_s.get_next_type for description.
*/
static payload_type_t get_next_type(private_nonce_payload_t *this)
{
return (this->next_payload);
}
/**
* Implements payload_t's set_next_type function.
* See #payload_s.set_next_type for description.
*/
static status_t set_next_type(private_nonce_payload_t *this,payload_type_t type)
{
this->next_payload = type;
return SUCCESS;
}
/**
* Implements payload_t's get_length function.
* See #payload_s.get_length for description.
*/
static size_t get_length(private_nonce_payload_t *this)
{
this->compute_length(this);
return this->payload_length;
}
/**
* Implements payload_t's and nonce_payload_t's destroy function.
* See #payload_s.destroy or nonce_payload_s.destroy for description.
*/
static status_t destroy(private_nonce_payload_t *this)
{
if (this->nonce.ptr != NULL)
{
allocator_free(this->nonce.ptr);
}
allocator_free(this);
return SUCCESS;
}
/*
* Described in header
*/
nonce_payload_t *nonce_payload_create()
{
private_nonce_payload_t *this = allocator_alloc_thing(private_nonce_payload_t);
if (this == NULL)
{
return NULL;
}
/* interface functions */
this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
this->public.payload_interface.get_encoding_rules = (status_t (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
this->public.payload_interface.set_next_type = (status_t (*) (payload_t *,payload_type_t)) set_next_type;
this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
/* public functions */
this->public.destroy = (status_t (*) (nonce_payload_t *)) destroy;
this->public.set_nonce = (status_t (*) (nonce_payload_t *,chunk_t)) set_nonce;
this->public.get_nonce = (status_t (*) (nonce_payload_t *,chunk_t*)) get_nonce;
/* private variables */
this->critical = FALSE;
this->next_payload = NO_PAYLOAD;
this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH;
this->nonce.ptr = NULL;
this->nonce.len = 0;
return (&(this->public));
}
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