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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 1.0.0
*
*/
/**
* APL Resource Record - RFC3123
*
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* | ADDRESSFAMILY |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* | PREFIX | N | AFDLENGTH |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* / AFDPART /
* | |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
*
* @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_APL extends Net_DNS2_RR
{
/*
* a list of all the address prefix list items
*/
public $apl_items = array();
/**
* method to return the rdata portion of the packet as a string
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
$out = '';
foreach ($this->apl_items as $item) {
if ($item['n'] == 1) {
$out .= '!';
}
$out .= $item['address_family'] . ':' .
$item['afd_part'] . '/' . $item['prefix'] . ' ';
}
return trim($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 $rdata)
{
foreach ($rdata as $item) {
if (preg_match('/^(!?)([1|2])\:([^\/]*)\/([0-9]{1,3})$/', $item, $m)) {
$i = array(
'address_family' => $m[2],
'prefix' => $m[4],
'n' => ($m[1] == '!') ? 1 : 0,
'afd_part' => strtolower($m[3])
);
$address = $this->_trimZeros(
$i['address_family'], $i['afd_part']
);
$i['afd_length'] = count(explode('.', $address));
$this->apl_items[] = $i;
}
}
return true;
}
/**
* parses the rdata of the Net_DNS2_Packet object
*
* @param Net_DNS2_Packet &$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) {
$offset = 0;
while ($offset < $this->rdlength) {
//
// unpack the family, prefix, negate and length values
//
$x = unpack(
'naddress_family/Cprefix/Cextra', substr($this->rdata, $offset)
);
$item = array(
'address_family' => $x['address_family'],
'prefix' => $x['prefix'],
'n' => ($x['extra'] >> 7) & 0x1,
'afd_length' => $x['extra'] & 0xf
);
switch($item['address_family']) {
case 1:
$r = unpack(
'C*', substr($this->rdata, $offset + 4, $item['afd_length'])
);
if (count($r) < 4) {
for ($c=count($r)+1; $c<4+1; $c++) {
$r[$c] = 0;
}
}
$item['afd_part'] = implode('.', $r);
break;
case 2:
$r = unpack(
'C*', substr($this->rdata, $offset + 4, $item['afd_length'])
);
if (count($r) < 8) {
for ($c=count($r)+1; $c<8+1; $c++) {
$r[$c] = 0;
}
}
$item['afd_part'] = sprintf(
'%x:%x:%x:%x:%x:%x:%x:%x',
$r[1], $r[2], $r[3], $r[4], $r[5], $r[6], $r[7], $r[8]
);
break;
default:
return false;
}
$this->apl_items[] = $item;
$offset += 4 + $item['afd_length'];
}
return true;
}
return false;
}
/**
* returns the rdata portion of the DNS packet
*
* @param Net_DNS2_Packet &$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 &$packet)
{
if (count($this->apl_items) > 0) {
$data = '';
foreach ($this->apl_items as $item) {
//
// pack the address_family and prefix values
//
$data .= pack(
'nCC',
$item['address_family'],
$item['prefix'],
($item['n'] << 7) | $item['afd_length']
);
switch($item['address_family']) {
case 1:
$address = explode(
'.',
$this->_trimZeros($item['address_family'], $item['afd_part'])
);
foreach ($address as $b) {
$data .= chr($b);
}
break;
case 2:
$address = explode(
':',
$this->_trimZeros($item['address_family'], $item['afd_part'])
);
foreach ($address as $b) {
$data .= pack('H', $b);
}
break;
default:
return null;
}
}
$packet->offset += strlen($data);
return $data;
}
return null;
}
/**
* returns an IP address with the right-hand zero's trimmed
*
* @param integer $family the IP address family from the rdata
* @param string $address the IP address
*
* @return string the trimmed IP addresss.
*
* @access private
*
*/
private function _trimZeros($family, $address)
{
$a = array();
switch($family) {
case 1:
$a = array_reverse(explode('.', $address));
break;
case 2:
$a = array_reverse(explode(':', $address));
break;
default:
return '';
}
foreach ($a as $value) {
if ($value === '0') {
array_shift($a);
}
}
$out = '';
switch($family) {
case 1:
$out = implode('.', array_reverse($a));
break;
case 2:
$out = implode(':', array_reverse($a));
break;
default:
return '';
}
return $out;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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