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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* DNS Library for handling lookups and updates.
*
* PHP Version 5
*
* Copyright (c) 2010, Mike Pultz <mike@mikepultz.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Mike Pultz nor the names of his contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRIC
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @category Networking
* @package Net_DNS2
* @author Mike Pultz <mike@mikepultz.com>
* @copyright 2010 Mike Pultz <mike@mikepultz.com>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @version SVN: $Id$
* @link http://pear.php.net/package/Net_DNS2
* @since File available since Release 0.6.0
*
*/
/**
* IPSECKEY Resource Record - RFC4025 section 2.1
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | precedence | gateway type | algorithm | gateway |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-------------+ +
* ~ gateway ~
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | /
* / public key /
* / /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
*
* @category Networking
* @package Net_DNS2
* @author Mike Pultz <mike@mikepultz.com>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @link http://pear.php.net/package/Net_DNS2
* @see Net_DNS2_RR
*
*/
class Net_DNS2_RR_IPSECKEY extends Net_DNS2_RR
{
const GATEWAY_TYPE_NONE = 0;
const GATEWAY_TYPE_IPV4 = 1;
const GATEWAY_TYPE_IPV6 = 2;
const GATEWAY_TYPE_DOMAIN = 3;
const ALGORITHM_NONE = 0;
const ALGORITHM_DSA = 1;
const ALGORITHM_RSA = 2;
/*
* Precedence (used the same was as a preference field)
*/
public $precedence;
/*
* Gateway type - specifies the format of the gataway information
* This can be either:
*
* 0 No Gateway
* 1 IPv4 address
* 2 IPV6 address
* 3 wire-encoded domain name (not compressed)
*
*/
public $gateway_type;
/*
* The algorithm used
*
* This can be:
*
* 0 No key is present
* 1 DSA key is present
* 2 RSA key is present
*
*/
public $algorithm;
/*
* The gatway information
*/
public $gateway;
/*
* the public key
*/
public $key;
/**
* method to return the rdata portion of the packet as a string
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
$out = $this->precedence . ' ' . $this->gateway_type . ' ' .
$this->algorithm . ' ';
switch($this->gateway_type) {
case self::GATEWAY_TYPE_NONE:
$out .= '. ';
break;
case self::GATEWAY_TYPE_IPV4:
case self::GATEWAY_TYPE_IPV6:
$out .= $this->gateway . ' ';
break;
case self::GATEWAY_TYPE_DOMAIN:
$out .= $this->gateway . '. ';
break;
}
$out .= $this->key;
return $out;
}
/**
* parses the rdata portion from a standard DNS config line
*
* @param array $rdata a string split line of values for the rdata
*
* @return boolean
* @access protected
*
*/
protected function rrFromString(array $rdata)
{
//
// load the data
//
$precedence = array_shift($rdata);
$gateway_type = array_shift($rdata);
$algorithm = array_shift($rdata);
$gateway = strtolower(trim(array_shift($rdata)));
$key = array_shift($rdata);
//
// validate it
//
switch($gateway_type) {
case self::GATEWAY_TYPE_NONE:
$gateway = '';
break;
case self::GATEWAY_TYPE_IPV4:
if (Net_DNS2::isIPv4($gateway) == false) {
return false;
}
break;
case self::GATEWAY_TYPE_IPV6:
if (Net_DNS2::isIPv6($gateway) == false) {
return false;
}
break;
case self::GATEWAY_TYPE_DOMAIN:
; // do nothing
break;
default:
return false;
}
//
// check the algorithm and key
//
switch($algorithm) {
case self::ALGORITHM_NONE:
$key = '';
break;
case self::ALGORITHM_DSA:
case self::ALGORITHM_RSA:
; // do nothing
break;
default:
return false;
}
//
// store the values
//
$this->precedence = $precedence;
$this->gateway_type = $gateway_type;
$this->algorithm = $algorithm;
$this->gateway = $gateway;
$this->key = $key;
return true;
}
/**
* parses the rdata of the Net_DNS2_Packet object
*
* @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet to parse the RR from
*
* @return boolean
* @access protected
*
*/
protected function rrSet(Net_DNS2_Packet &$packet)
{
if ($this->rdlength > 0) {
//
// parse off the precedence, gateway type and algorithm
//
$x = unpack('Cprecedence/Cgateway_type/Calgorithm', $this->rdata);
$this->precedence = $x['precedence'];
$this->gateway_type = $x['gateway_type'];
$this->algorithm = $x['algorithm'];
$offset = 3;
//
// extract the gatway based on the type
//
switch($this->gateway_type) {
case self::GATEWAY_TYPE_NONE:
$this->gateway = '';
break;
case self::GATEWAY_TYPE_IPV4:
$this->gateway = inet_ntop(substr($this->rdata, $offset, 4));
$offset += 4;
break;
case self::GATEWAY_TYPE_IPV6:
$ip = unpack('n8', substr($this->rdata, $offset, 16));
if (count($ip) == 8) {
$this->gateway = vsprintf('%x:%x:%x:%x:%x:%x:%x:%x', $ip);
$offset += 16;
} else {
return false;
}
break;
case self::GATEWAY_TYPE_DOMAIN:
$doffset = $offset + $packet->offset;
$this->gateway = Net_DNS2_Packet::expand($packet, $doffset);
$offset = ($doffset - $packet->offset);
break;
default:
return false;
}
//
// extract the key
//
switch($this->algorithm) {
case self::ALGORITHM_NONE:
$this->key = '';
break;
case self::ALGORITHM_DSA:
case self::ALGORITHM_RSA:
$this->key = base64_encode(substr($this->rdata, $offset));
break;
default:
return false;
}
return true;
}
return false;
}
/**
* returns the rdata portion of the DNS packet
*
* @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet use for
* compressed names
*
* @return mixed either returns a binary packed
* string or null on failure
* @access protected
*
*/
protected function rrGet(Net_DNS2_Packet &$packet)
{
//
// pack the precedence, gateway type and algorithm
//
$data = pack(
'CCC', $this->precedence, $this->gateway_type, $this->algorithm
);
//
// add the gateway based on the type
//
switch($this->gateway_type) {
case self::GATEWAY_TYPE_NONE:
; // add nothing
break;
case self::GATEWAY_TYPE_IPV4:
case self::GATEWAY_TYPE_IPV6:
$data .= inet_pton($this->gateway);
break;
case self::GATEWAY_TYPE_DOMAIN:
$data .= chr(strlen($this->gateway)) . $this->gateway;
break;
default:
return null;
}
//
// add the key if there's one specified
//
switch($this->algorithm) {
case self::ALGORITHM_NONE:
; // add nothing
break;
case self::ALGORITHM_DSA:
case self::ALGORITHM_RSA:
$data .= base64_decode($this->key);
break;
default:
return null;
}
$packet->offset += strlen($data);
return $data;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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