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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: OPT.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
*
*/
/**
* OPT Resource Record - RFC2929 section 3.1
*
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* | OPTION-CODE |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* | OPTION-LENGTH |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* | |
* / OPTION-DATA /
* / /
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
*
* @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_OPT extends Net_DNS2_RR
{
/*
* option code - assigned by IANA
*/
public $option_code;
/*
* the length of the option data
*/
public $option_length;
/*
* the option data
*/
public $option_data;
/*
* the extended response code stored in the TTL
*/
public $extended_rcode;
/*
* the implementation level
*/
public $version;
/*
* the extended flags
*/
public $z;
/**
* method to return the rdata portion of the packet as a string. There is no
* defintion for returning an OPT RR by string- this is just here to validate
* the binary parsing / building routines.
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
return $this->option_code . ' ' . $this->option_data;
}
/**
* parses the rdata portion from a standard DNS config line. There is no
* definition for parsing a OPT RR by string- this is just here to validate
* the binary parsing / building routines.
*
* @param array $rdata a string split line of values for the rdata
*
* @return boolean
* @access protected
*
*/
protected function rrFromString(array $rdata)
{
$this->option_code = array_shift($rdata);
$this->option_data = array_shift($rdata);
$this->option_length = strlen($this->option_data);
$x = unpack('Cextended/Cversion/nz', pack('N', $this->ttl));
$this->extended_rcode = $x['extended'];
$this->version = $x['version'];
$this->z = $x['z'];
return true;
}
/**
* parses the rdata of the Net_DNS2_Packet object
*
* @param Net_DNS2_Packet &$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 code and length
//
$x = unpack('noption_code/noption_length', $this->rdata);
$this->option_code = $x['option_code'];
$this->option_length = $x['option_length'];
//
// copy out the data based on the length
//
$this->option_data = substr($this->rdata, 4);
//
// parse out the TTL value
//
$ttl = pack('N', $this->ttl);
$x = unpack('Cextended/Cversion/nz', $ttl);
$this->extended_rcode = $x['extended'];
$this->version = $x['version'];
$this->z = $x['z'];
return true;
}
return false;
}
/**
* returns the rdata portion of the DNS packet
*
* @param Net_DNS2_Packet &$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 &$packet)
{
if ($this->option_code) {
$ttl = unpack(
'N', pack('CCn', $this->extended_rcode, $this->version, $this->z)
);
$this->ttl = $ttl[1];
return pack('nn', $this->option_code, $this->option_length) .
$this->option_data;
}
return null;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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