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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: HIP.php 127 2011-12-03 03:29:39Z mike.pultz $
* @link http://pear.php.net/package/Net_DNS2
* @since File available since Release 1.0.0
*
*/
/**
* HIP Resource Record - RFC5205 section 5
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | HIT length | PK algorithm | PK length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* ~ HIT ~
* | |
* + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | |
* +-+-+-+-+-+-+-+-+-+-+-+ +
* | Public Key |
* ~ ~
* | |
* + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
* | |
* ~ Rendezvous Servers ~
* | |
* + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* +-+-+-+-+-+-+-+
*
* @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_HIP extends Net_DNS2_RR
{
/*
* The length of the HIT field
*/
public $hit_length;
/*
* the public key cryptographic algorithm
*/
public $pk_algorithm;
/*
* the length of the public key field
*/
public $pk_length;
/*
* The HIT is stored as a binary value in network byte order.
*/
public $hit;
/*
* The public key
*/
public $public_key;
/*
* a list of rendezvous servers
*/
public $rendezvous_servers = array();
/**
* method to return the rdata portion of the packet as a string
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
$out = $this->pk_algorithm . ' ' .
$this->hit . ' ' . $this->public_key . ' ';
foreach ($this->rendezvous_servers as $index => $server) {
$out .= $server . '. ';
}
return trim($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)
{
$this->pk_algorithm = array_shift($rdata);
$this->hit = strtoupper(array_shift($rdata));
$this->public_key = array_shift($rdata);
//
// anything left on the array, must be one or more rendezevous servers. add
// them and strip off the trailing dot
//
if (count($rdata) > 0) {
$this->rendezvous_servers = preg_replace('/\.$/', '', $rdata);
}
//
// store the lengths;
//
$this->hit_length = strlen(pack('H*', $this->hit));
$this->pk_length = strlen(base64_decode($this->public_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) {
//
// unpack the algorithm and length values
//
$x = unpack('Chit_length/Cpk_algorithm/npk_length', $this->rdata);
$this->hit_length = $x['hit_length'];
$this->pk_algorithm = $x['pk_algorithm'];
$this->pk_length = $x['pk_length'];
$offset = 4;
//
// copy out the HIT value
//
$hit = unpack('H*', substr($this->rdata, $offset, $this->hit_length));
$this->hit = strtoupper($hit[1]);
$offset += $this->hit_length;
//
// copy out the public key
//
$this->public_key = base64_encode(
substr($this->rdata, $offset, $this->pk_length)
);
$offset += $this->pk_length;
//
// copy out any possible rendezvous servers
//
$offset = $packet->offset + $offset;
while ( ($offset - $packet->offset) < $this->rdlength) {
$this->rendezvous_servers[] = Net_DNS2_Packet::expand(
$packet, $offset
);
}
return true;
}
return false;
}
/**
* returns the rdata portion of the DNS packet
*
* @param Net_DNS2_Packet &$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 &$packet)
{
if ( (strlen($this->hit) > 0) && (strlen($this->public_key) > 0) ) {
//
// pack the length, algorithm and HIT values
//
$data = pack(
'CCnH*',
$this->hit_length,
$this->pk_algorithm,
$this->pk_length,
$this->hit
);
//
// add the public key
//
$data .= base64_decode($this->public_key);
//
// add the offset
//
$packet->offset += strlen($data);
//
// add each rendezvous server
//
foreach ($this->rendezvous_servers as $index => $server) {
$data .= $packet->compress($server, $packet->offset);
}
return $data;
}
return null;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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