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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: NSEC3.php 125 2011-12-03 00:19:49Z mike.pultz $
* @link http://pear.php.net/package/Net_DNS2
* @since File available since Release 0.6.0
*
*/
/**
* NSEC3 Resource Record - RFC5155 section 3.2
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Hash Alg. | Flags | Iterations |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Salt Length | Salt /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Hash Length | Next Hashed Owner Name /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* / Type Bit Maps /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* @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_NSEC3 extends Net_DNS2_RR
{
/*
* Algorithm to use
*/
public $algorithm;
/*
* flags
*/
public $flags;
/*
* defines the number of additional times the hash is performed.
*/
public $iterations;
/*
* the length of the salt- not displayed
*/
public $salt_length;
/*
* the salt
*/
public $salt;
/*
* the length of the hash value
*/
public $hash_length;
/*
* the hashed value of the owner name
*/
public $hashed_owner_name;
/*
* array of RR type names
*/
public $type_bit_maps = array();
/**
* method to return the rdata portion of the packet as a string
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
$out = $this->algorithm . ' ' . $this->flags . ' ' . $this->iterations . ' ';
//
// per RFC5155, the salt_length value isn't displayed, and if the salt
// is empty, the salt is displayed as '-'
//
if ($this->salt_length > 0) {
$out .= $this->salt;
} else {
$out .= '-';
}
//
// per RFC5255 the hash length isn't shown
//
$out .= ' ' . $this->hashed_owner_name;
//
// show the RR's
//
foreach ($this->type_bit_maps as $rr) {
$out .= ' ' . strtoupper($rr);
}
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)
{
$this->algorithm = array_shift($rdata);
$this->flags = array_shift($rdata);
$this->iterations = array_shift($rdata);
//
// an empty salt is represented as '-' per RFC5155 section 3.3
//
$salt = array_shift($rdata);
if ($salt == '-') {
$this->salt_length = 0;
$this->salt = '';
} else {
$this->salt_length = strlen(pack('H*', $salt));
$this->salt = strtoupper($salt);
}
$this->hashed_owner_name = array_shift($rdata);
$this->hash_length = strlen(base64_decode($this->hashed_owner_name));
$this->type_bit_maps = $rdata;
return true;
}
/**
* parses the rdata of the Net_DNS2_Packet object
*
* @param Net_DNS2_Packet &$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 first values
//
$x = unpack('Calgorithm/Cflags/niterations/Csalt_length', $this->rdata);
$this->algorithm = $x['algorithm'];
$this->flags = $x['flags'];
$this->iterations = $x['iterations'];
$this->salt_length = $x['salt_length'];
$offset = 5;
if ($this->salt_length > 0) {
$x = unpack('H*', substr($this->rdata, $offset, $this->salt_length));
$this->salt = strtoupper($x[1]);
$offset += $this->salt_length;
}
//
// unpack the hash length
//
$x = unpack('@' . $offset . '/Chash_length', $this->rdata);
$offset++;
//
// copy out the hash
//
$this->hash_length = $x['hash_length'];
if ($this->hash_length > 0) {
$this->hashed_owner_name = base64_encode(
substr($this->rdata, $offset, $this->hash_length)
);
$offset += $this->hash_length;
}
//
// parse out the RR bitmap
//
$this->type_bit_maps = Net_DNS2_BitMap::bitMapToArray(
substr($this->rdata, $offset)
);
return true;
}
return false;
}
/**
* returns the rdata portion of the DNS packet
*
* @param Net_DNS2_Packet &$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)
{
//
// pull the salt and build the length
//
$salt = pack('H*', $this->salt);
$this->salt_length = strlen($salt);
//
// pack the algorithm, flags, iterations and salt length
//
$data = pack(
'CCnC',
$this->algorithm, $this->flags, $this->iterations, $this->salt_length
);
$data .= $salt;
//
// add the hash length and hash
//
$data .= chr($this->hash_length);
if ($this->hash_length > 0) {
$data .= base64_decode($this->hashed_owner_name);
}
//
// conver the array of RR names to a type bitmap
//
$data .= Net_DNS2_BitMap::arrayToBitMap($this->type_bit_maps);
return $data;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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