188 lines
4.4 KiB
PHP
188 lines
4.4 KiB
PHP
<?php
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/**
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* DNS Library for handling lookups and updates.
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*
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* Copyright (c) 2020, Mike Pultz <mike@mikepultz.com>. All rights reserved.
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*
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* See LICENSE for more details.
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*
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* @category Networking
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* @package Net_DNS2
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* @author Mike Pultz <mike@mikepultz.com>
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* @copyright 2020 Mike Pultz <mike@mikepultz.com>
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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* @link https://netdns2.com/
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* @since File available since Release 1.0.1
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*
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*/
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/**
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* WKS Resource Record - RFC1035 section 3.4.2
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*
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* +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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* | ADDRESS |
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* +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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* | PROTOCOL | |
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* +--+--+--+--+--+--+--+--+ |
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* | |
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* / <BIT MAP> /
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* / /
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* +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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*
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*/
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class Net_DNS2_RR_WKS extends Net_DNS2_RR
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{
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/*
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* The IP address of the service
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*/
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public $address;
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/*
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* The protocol of the service
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*/
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public $protocol;
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/*
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* bitmap
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*/
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public $bitmap = [];
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/**
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* method to return the rdata portion of the packet as a string
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*
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* @return string
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* @access protected
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*
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*/
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protected function rrToString()
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{
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$data = $this->address . ' ' . $this->protocol;
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foreach ($this->bitmap as $port) {
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$data .= ' ' . $port;
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}
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return $data;
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}
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/**
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* parses the rdata portion from a standard DNS config line
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*
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* @param array $rdata a string split line of values for the rdata
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*
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* @return boolean
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* @access protected
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*
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*/
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protected function rrFromString(array $rdata)
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{
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$this->address = strtolower(trim(array_shift($rdata), '.'));
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$this->protocol = array_shift($rdata);
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$this->bitmap = $rdata;
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return true;
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}
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/**
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* parses the rdata of the Net_DNS2_Packet object
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*
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* @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet to parse the RR from
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*
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* @return boolean
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* @access protected
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*
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*/
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protected function rrSet(Net_DNS2_Packet &$packet)
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{
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if ($this->rdlength > 0) {
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//
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// get the address and protocol value
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//
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$x = unpack('Naddress/Cprotocol', $this->rdata);
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$this->address = long2ip($x['address']);
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$this->protocol = $x['protocol'];
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//
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// unpack the port list bitmap
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//
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$port = 0;
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foreach (unpack('@5/C*', $this->rdata) as $set) {
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$s = sprintf('%08b', $set);
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for ($i=0; $i<8; $i++, $port++) {
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if ($s[$i] == '1') {
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$this->bitmap[] = $port;
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}
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}
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}
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return true;
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}
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return false;
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}
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/**
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* returns the rdata portion of the DNS packet
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*
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* @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet use for
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* compressed names
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*
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* @return mixed either returns a binary packed
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* string or null on failure
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* @access protected
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*
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*/
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protected function rrGet(Net_DNS2_Packet &$packet)
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{
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if (strlen($this->address) > 0) {
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$data = pack('NC', ip2long($this->address), $this->protocol);
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$ports = [];
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$n = 0;
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foreach ($this->bitmap as $port) {
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$ports[$port] = 1;
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if ($port > $n) {
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$n = $port;
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}
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}
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for ($i=0; $i<ceil($n/8)*8; $i++) {
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if (!isset($ports[$i])) {
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$ports[$i] = 0;
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}
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}
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ksort($ports);
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$string = '';
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$n = 0;
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foreach ($ports as $s) {
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$string .= $s;
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$n++;
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if ($n == 8) {
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$data .= chr(bindec($string));
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$string = '';
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$n = 0;
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}
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}
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$packet->offset += strlen($data);
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return $data;
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}
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return null;
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}
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}
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