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/*
* Copyright (C) 2012 Reto Guadagnini
* HSR 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 "ipseckey.h"
#include <library.h>
#include <utils/debug.h>
#include <bio/bio_reader.h>
typedef struct private_ipseckey_t private_ipseckey_t;
/**
* private data of the ipseckey
*/
struct private_ipseckey_t {
/**
* public functions
*/
ipseckey_t public;
/**
* Precedence
*/
uint8_t precedence;
/**
* Gateway type
*/
uint8_t gateway_type;
/**
* Algorithm
*/
uint8_t algorithm;
/**
* Gateway
*/
chunk_t gateway;
/**
* Public key
*/
chunk_t public_key;
};
METHOD(ipseckey_t, get_precedence, uint8_t,
private_ipseckey_t *this)
{
return this->precedence;
}
METHOD(ipseckey_t, get_gateway_type, ipseckey_gw_type_t,
private_ipseckey_t *this)
{
return this->gateway_type;
}
METHOD(ipseckey_t, get_algorithm, ipseckey_algorithm_t,
private_ipseckey_t *this)
{
return this->algorithm;
}
METHOD(ipseckey_t, get_gateway, chunk_t,
private_ipseckey_t *this)
{
return this->gateway;
}
METHOD(ipseckey_t, get_public_key, chunk_t,
private_ipseckey_t *this)
{
return this->public_key;
}
METHOD(ipseckey_t, destroy, void,
private_ipseckey_t *this)
{
chunk_free(&this->gateway);
chunk_free(&this->public_key);
free(this);
}
/*
* See header
*/
ipseckey_t *ipseckey_create_frm_rr(rr_t *rr)
{
private_ipseckey_t *this;
bio_reader_t *reader = NULL;
uint8_t label;
chunk_t tmp;
INIT(this,
.public = {
.get_precedence = _get_precedence,
.get_gateway_type = _get_gateway_type,
.get_algorithm = _get_algorithm,
.get_gateway = _get_gateway,
.get_public_key = _get_public_key,
.destroy = _destroy,
},
);
if (rr->get_type(rr) != RR_TYPE_IPSECKEY)
{
DBG1(DBG_CFG, "unable to create an ipseckey out of an RR "
"whose type is not IPSECKEY");
free(this);
return NULL;
}
/** Parse the content (RDATA field) of the RR */
reader = bio_reader_create(rr->get_rdata(rr));
if (!reader->read_uint8(reader, &this->precedence) ||
!reader->read_uint8(reader, &this->gateway_type) ||
!reader->read_uint8(reader, &this->algorithm))
{
DBG1(DBG_CFG, "ipseckey RR has a wrong format");
reader->destroy(reader);
free(this);
return NULL;
}
switch (this->gateway_type)
{
case IPSECKEY_GW_TP_NOT_PRESENT:
break;
case IPSECKEY_GW_TP_IPV4:
if (!reader->read_data(reader, 4, &this->gateway))
{
DBG1(DBG_CFG, "ipseckey gateway field does not contain an "
"IPv4 address as expected");
reader->destroy(reader);
free(this);
return NULL;
}
this->gateway = chunk_clone(this->gateway);
break;
case IPSECKEY_GW_TP_IPV6:
if (!reader->read_data(reader, 16, &this->gateway))
{
DBG1(DBG_CFG, "ipseckey gateway field does not contain an "
"IPv6 address as expected");
reader->destroy(reader);
free(this);
return NULL;
}
this->gateway = chunk_clone(this->gateway);
break;
case IPSECKEY_GW_TP_WR_ENC_DNAME:
/**
* Uncompressed domain name as defined in RFC 1035 chapter 3.
*
* TODO: Currently we ignore wire encoded domain names.
*
*/
while (reader->read_uint8(reader, &label) &&
label != 0 && label < 192)
{
if (!reader->read_data(reader, label, &tmp))
{
DBG1(DBG_CFG, "wrong wire encoded domain name format "
"in ipseckey gateway field");
reader->destroy(reader);
free(this);
return NULL;
}
}
break;
default:
DBG1(DBG_CFG, "unable to parse ipseckey gateway field");
reader->destroy(reader);
free(this);
return NULL;
}
if (!reader->read_data(reader, reader->remaining(reader),
&this->public_key))
{
DBG1(DBG_CFG, "failed to read ipseckey public key field");
reader->destroy(reader);
chunk_free(&this->gateway);
free(this);
return NULL;
}
this->public_key = chunk_clone(this->public_key);
reader->destroy(reader);
return &this->public;
}
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