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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
*/
/* Include files {{{ */
require_once("Net/DNS/RR/A.php");
require_once("Net/DNS/RR/AAAA.php");
require_once("Net/DNS/RR/NS.php");
require_once("Net/DNS/RR/CNAME.php");
require_once("Net/DNS/RR/PTR.php");
require_once("Net/DNS/RR/SOA.php");
require_once("Net/DNS/RR/MX.php");
require_once("Net/DNS/RR/TSIG.php");
require_once("Net/DNS/RR/TXT.php");
require_once("Net/DNS/RR/HINFO.php");
require_once("Net/DNS/RR/SRV.php");
require_once("Net/DNS/RR/NAPTR.php");
/* }}} */
/* Net_DNS_RR object definition {{{ */
/**
* Resource Record object definition
*
* Builds or parses resource record sections of the DNS packet including
* the answer, authority, and additional sections of the packet.
*
* @package Net_DNS
*/
class Net_DNS_RR
{
/* class variable definitions {{{ */
var $name;
var $type;
var $class;
var $ttl;
var $rdlength;
var $rdata;
/* }}} */
/*
* Use Net_DNS_RR::factory() instead
*
* @access private
*/
/* class constructor - Net_DNS_RR($rrdata) {{{ */
function Net_DNS_RR($rrdata)
{
if ($rrdata != 'getRR') { //BC check/warning remove later
trigger_error("Please use Net_DNS_RR::factory() instead");
}
}
/*
* Returns an RR object, use this instead of constructor
*
* @param mixed $rr_rdata Options as string, array or data
* @return object Net_DNS_RR or Net_DNS_RR_<type>
* @access public
* @see Net_DNS_RR::new_from_array Net_DNS_RR::new_from_data Net_DNS_RR::new_from_string
*/
function &factory($rrdata, $update_type = '')
{
if (is_string($rrdata)) {
$rr = &Net_DNS_RR::new_from_string($rrdata, $update_type);
} elseif (count($rrdata) == 7) {
list($name, $rrtype, $rrclass, $ttl, $rdlength, $data, $offset) = $rrdata;
$rr = &Net_DNS_RR::new_from_data($name, $rrtype, $rrclass, $ttl, $rdlength, $data, $offset);
} else {
$rr = &Net_DNS_RR::new_from_array($rrdata);
}
return $rr;
}
/* }}} */
/* Net_DNS_RR::new_from_data($name, $ttl, $rrtype, $rrclass, $rdlength, $data, $offset) {{{ */
function &new_from_data($name, $rrtype, $rrclass, $ttl, $rdlength, $data, $offset)
{
$rr = &new Net_DNS_RR('getRR');
$rr->name = $name;
$rr->type = $rrtype;
$rr->class = $rrclass;
$rr->ttl = $ttl;
$rr->rdlength = $rdlength;
$rr->rdata = substr($data, $offset, $rdlength);
if (class_exists('Net_DNS_RR_' . $rrtype)) {
$scn = 'Net_DNS_RR_' . $rrtype;
$rr = new $scn($rr, $data, $offset);
}
return $rr;
}
/* }}} */
/* Net_DNS_RR::new_from_string($rrstring, $update_type = '') {{{ */
function &new_from_string($rrstring, $update_type = '')
{
$rr = &new Net_DNS_RR('getRR');
$ttl = 0;
$parts = preg_split('/[\s]+/', $rrstring);
while (count($parts) > 0) {
$s = array_shift($parts);
if (!isset($name)) {
$name = ereg_replace('\.+$', '', $s);
} else if (preg_match('/^\d+$/', $s)) {
$ttl = $s;
} else if (!isset($rrclass) && ! is_null(Net_DNS::classesbyname(strtoupper($s)))) {
$rrclass = strtoupper($s);
$rdata = join(' ', $parts);
} else if (! is_null(Net_DNS::typesbyname(strtoupper($s)))) {
$rrtype = strtoupper($s);
$rdata = join(' ', $parts);
break;
} else {
break;
}
}
/*
* Do we need to do this?
*/
$rdata = trim(chop($rdata));
if (! strlen($rrtype) && strlen($rrclass) && $rrclass == 'ANY') {
$rrtype = $rrclass;
$rrclass = 'IN';
} else if (! isset($rrclass)) {
$rrclass = 'IN';
}
if (! strlen($rrtype)) {
$rrtype = 'ANY';
}
if (strlen($update_type)) {
$update_type = strtolower($update_type);
if ($update_type == 'yxrrset') {
$ttl = 0;
if (! strlen($rdata)) {
$rrclass = 'ANY';
}
} else if ($update_type == 'nxrrset') {
$ttl = 0;
$rrclass = 'NONE';
$rdata = '';
} else if ($update_type == 'yxdomain') {
$ttl = 0;
$rrclass = 'ANY';
$rrtype = 'ANY';
$rdata = '';
} else if ($update_type == 'nxdomain') {
$ttl = 0;
$rrclass = 'NONE';
$rrtype = 'ANY';
$rdata = '';
} else if (preg_match('/^(rr_)?add$/', $update_type)) {
$update_type = 'add';
if (! $ttl) {
$ttl = 86400;
}
} else if (preg_match('/^(rr_)?del(ete)?$/', $update_type)) {
$update_type = 'del';
$ttl = 0;
$rrclass = $rdata ? 'NONE' : 'ANY';
}
}
if (strlen($rrtype)) {
$rr->name = $name;
$rr->type = $rrtype;
$rr->class = $rrclass;
$rr->ttl = $ttl;
$rr->rdlength = 0;
$rr->rdata = '';
if (class_exists('Net_DNS_RR_' . $rrtype)) {
$scn = 'Net_DNS_RR_' . $rrtype;
return new $scn($rr, $rdata);
} else {
return $rr;
}
} else {
return null;
}
}
/* }}} */
/* Net_DNS_RR::new_from_array($rrarray) {{{ */
function &new_from_array($rrarray)
{
$rr = &new Net_DNS_RR('getRR');
foreach ($rrarray as $k => $v) {
$rr->{strtolower($k)} = $v;
}
if (! strlen($rr->name)) {
return null;
}
if (! strlen($rr->type)){
return null;
}
if (! $rr->ttl) {
$rr->ttl = 0;
}
if (! strlen($rr->class)) {
$rr->class = 'IN';
}
if (strlen($rr->rdata)) {
$rr->rdlength = strlen($rr->rdata);
}
if (class_exists('Net_DNS_RR_' . $rr->rrtype)) {
$scn = 'Net_DNS_RR_' . $rr->rrtype;
return new $scn($rr, $rr->rdata);
} else {
return $rr;
}
}
/* }}} */
/* Net_DNS_RR::display() {{{ */
function display()
{
echo $this->string() . "\n";
}
/* }}} */
/* Net_DNS_RR::string() {{{ */
function string()
{
return $this->name . ".\t" . (strlen($this->name) < 16 ? "\t" : '') .
$this->ttl . "\t" .
$this->class. "\t" .
$this->type . "\t" .
$this->rdatastr();
}
/* }}} */
/* Net_DNS_RR::rdatastr() {{{ */
function rdatastr()
{
if ($this->rdlength) {
return '; rdlength = ' . $this->rdlength;
}
return '; no data';
}
/* }}} */
/* Net_DNS_RR::rdata() {{{ */
function rdata(&$packetORrdata, $offset = '')
{
if ($offset) {
return $this->rr_rdata($packetORrdata, $offset);
} else if (strlen($this->rdata)) {
return $this->rdata;
} else {
return null;
}
}
/* }}} */
/* Net_DNS_RR::rr_rdata($packet, $offset) {{{ */
function rr_rdata(&$packet, $offset)
{
return (strlen($this->rdata) ? $this->rdata : '');
}
/* }}} */
/* Net_DNS_RR::data() {{{ */
function data(&$packet, $offset)
{
$data = $packet->dn_comp($this->name, $offset);
$data .= pack('n', Net_DNS::typesbyname(strtoupper($this->type)));
$data .= pack('n', Net_DNS::classesbyname(strtoupper($this->class)));
$data .= pack('N', $this->ttl);
$offset += strlen($data) + 2; // The 2 extra bytes are for rdlength
$rdata = $this->rdata($packet, $offset);
$data .= pack('n', strlen($rdata));
$data .= $rdata;
return $data;
}
/* }}} */
}
/* }}} */
/* 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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