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Net
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DNS
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RR.php
< prev
Wrap
PHP Script
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2004-03-24
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9KB
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290 lines
<?php
/*
* License Information:
*
* Net_DNS: A resolver library for PHP
* Copyright (C) 2002 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("$phpdns_basedir/DNS/RR/A.php");
require_once("$phpdns_basedir/DNS/RR/NS.php");
require_once("$phpdns_basedir/DNS/RR/CNAME.php");
require_once("$phpdns_basedir/DNS/RR/PTR.php");
require_once("$phpdns_basedir/DNS/RR/SOA.php");
require_once("$phpdns_basedir/DNS/RR/MX.php");
require_once("$phpdns_basedir/DNS/RR/TSIG.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 $rdata;
/* }}} */
/*
* I finally did it... i pass an array to the function
* instead of a parameter list... UGH... i hate perl...
*/
/* class constructor - Net_DNS_RR($rrdata) {{{ */
function Net_DNS_RR($rrdata)
{
if (is_string($rrdata)) {
$this = $this->new_from_string($rrdata);
} else if (count($rrdata) == 7) {
list ($name, $rrtype, $rrclass, $ttl, $rdlength, $data, $offset) = $rrdata;
$this = $this->new_from_data($name, $rrtype, $rrclass, $ttl, $rdlength, $data, $offset);
} else {
$this = $this->new_from_array($rrdata);
}
}
/* }}} */
/* Net_DNS_RR::new_from_data($name, $ttl, $rrtype, $rrclass, $rdlength, $data, $offset) {{{ */
function new_from_data($name, $rrtype, $rrclass, $ttl, $rdlength, $data, $offset)
{
$this->name = $name;
$this->type = $rrtype;
$this->class = $rrclass;
$this->ttl = $ttl;
$this->rdlength = $rdlength;
$this->rdata = substr($data, $offset, $rdlength);
if (class_exists("Net_DNS_RR_" . $rrtype)) {
$scn = "Net_DNS_RR_" . $rrtype;
$subclass = new $scn($this, $data, $offset);
return($subclass);
} else {
return($this);
}
}
/* }}} */
/* Net_DNS_RR::new_from_string($rrstring, $update_type = "") {{{ */
function new_from_string($rrstring, $update_type = "")
{
$ttl = 0;
$parts = preg_split("/[\s]+/", $rrstring);
while ($s = array_shift($parts)) {
if (!strlen($name)) {
$name = ereg_replace("\.+$", "", $s);
} else if (preg_match("/^\d+$/", $s)) {
$ttl = $s;
} else if (!strlen($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;
$rrclass = "IN";
} else if (! strlen($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)) {
$this->name = $name;
$this->type = $rrtype;
$this->class = $rrclass;
$this->ttl = $ttl;
$this->rdlength = 0;
$this->rdata = "";
if (class_exists("Net_DNS_RR_" . $rrtype)) {
$scn = "Net_DNS_RR_" . $rrtype;
$rc = new $scn($this, $rdata);
return($rc);
} else {
return($this);
}
} else {
return(NULL);
}
}
/* }}} */
/* Net_DNS_RR::new_from_array($rrarray) {{{ */
function new_from_array($rrarray)
{
foreach ($rrarray as $k => $v) {
$this->{strtolower($k)} = $v;
}
if (! strlen($this->name)) {
return(NULL);
}
if (! strlen($this->type)){
return(NULL);
}
if (! $this->ttl) {
$this->ttl = 0;
}
if (! strlen($this->class)) {
$this->class = "IN";
}
if (strlen($this->rdata)) {
$this->rdlength = strlen($rdata);
}
if (class_exists("Net_DNS_RR_" . $rrtype)) {
$scn = "Net_DNS_RR_" . $rrtype;
$rc = new $scn($this, $rdata);
return($rc);
} else
return($this);
}
/* }}} */
/* 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
* }}} */
?>