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<?php
/*
* License Information:
*
* Net_DNS: A resolver library for PHP
* Copyright (c) 2002-2003 Eric Kilfoil eric@ypass.net
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Net_DNS_RR_AAAA object definition {{{ */
/**
* A representation of a resource record of type <b>AAAA</b>
*
* @package Net_DNS
*/
class Net_DNS_RR_AAAA extends Net_DNS_RR
{
/* class variable definitions {{{ */
var $name;
var $type;
var $class;
var $ttl;
var $rdlength;
var $rdata;
var $address;
/* }}} */
/* class constructor - Net_DNS_RR_AAAA(&$rro, $data, $offset = '') {{{ */
function Net_DNS_RR_AAAA(&$rro, $data, $offset = '')
{
$this->name = $rro->name;
$this->type = $rro->type;
$this->class = $rro->class;
$this->ttl = $rro->ttl;
$this->rdlength = $rro->rdlength;
$this->rdata = $rro->rdata;
if ($offset) {
$this->address = Net_DNS_RR_AAAA::ipv6_decompress(substr($this->rdata, 0, $this->rdlength));
} else {
if (strlen($data)) {
if (count($adata = explode(':', $data, 8)) >= 3) {
foreach($adata as $addr)
if (!preg_match('/^[0-9A-F]{0,4}$/i', $addr)) return;
$this->address = trim($data);
}
}
}
}
/* }}} */
/* Net_DNS_RR_AAAA::rdatastr() {{{ */
function rdatastr()
{
if (strlen($this->address)) {
return $this->address;
}
return '; no data';
}
/* }}} */
/* Net_DNS_RR_AAAA::rr_rdata($packet, $offset) {{{ */
function rr_rdata($packet, $offset)
{
return Net_DNS_RR_AAAA::ipv6_compress($this->address);
}
/* }}} */
/* Net_DNS_RR_AAAA::ipv6_compress($addr) {{{ */
function ipv6_compress($addr)
{
$numparts = count(explode(':', $addr));
if ($numparts < 3 || $numparts > 8 ||
!preg_match('/^([0-9A-F]{0,4}:){0,7}(:[0-9A-F]{0,4}){0,7}$/i', $addr)) {
/* Non-sensical IPv6 address */
return pack('n8', 0, 0, 0, 0, 0, 0, 0, 0);
}
if (strpos($addr, '::') !== false) {
/* First we have to normalize the address, turn :: into :0:0:0:0: */
$filler = str_repeat(':0', 9 - $numparts) . ':';
if (substr($addr, 0, 2) == '::') {
$filler = "0$filler";
}
if (substr($addr, -2, 2) == '::') {
$filler .= '0';
}
$addr = str_replace('::', $filler, $addr);
}
$aparts = explode(':', $addr);
return pack('n8', hexdec($aparts[0]), hexdec($aparts[1]), hexdec($aparts[2]), hexdec($aparts[3]),
hexdec($aparts[4]), hexdec($aparts[5]), hexdec($aparts[6]), hexdec($aparts[7]));
}
/* }}} */
/* Net_DNS_RR_AAAA::ipv6_decompress($pack) {{{ */
function ipv6_decompress($pack)
{
if (strlen($pack) != 16) {
/* Must be 8 shorts long */
return '::';
}
$a = unpack('n8', $pack);
$addr = vsprintf("%x:%x:%x:%x:%x:%x:%x:%x", $a);
/* Shorthand the first :0:0: set into a :: */
/* TODO: Make this is a single replacement pattern */
if (substr($addr, -4) == ':0:0') {
return preg_replace('/((:0){2,})$/', '::', $addr);
} elseif (substr($addr, 0, 4) == '0:0:') {
return '0:0:'. substr($addr, 4);
} else {
return preg_replace('/(:(0:){2,})/', '::', $addr);
}
}
/* }}} */
}
/* }}} */
/* VIM settings {{{
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* soft-stop-width: 4
* c indent on
* End:
* vim600: sw=4 ts=4 sts=4 cindent fdm=marker et
* vim<600: sw=4 ts=4
* }}} */
?>
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