146 lines
3.5 KiB
PHP
146 lines
3.5 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 0.6.0
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*
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*/
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/**
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* This class handles building new DNS response packets; it parses binary packed
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* packets that come off the wire
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*
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*/
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class Net_DNS2_Packet_Response extends Net_DNS2_Packet
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{
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/*
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* The name servers that this response came from
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*/
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public $answer_from;
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/*
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* The socket type the answer came from (TCP/UDP)
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*/
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public $answer_socket_type;
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/*
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* The query response time in microseconds
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*/
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public $response_time = 0;
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/**
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* Constructor - builds a new Net_DNS2_Packet_Response object
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*
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* @param string $data binary DNS packet
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* @param integer $size the length of the DNS packet
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*
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* @throws Net_DNS2_Exception
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* @access public
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*
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*/
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public function __construct($data, $size)
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{
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$this->set($data, $size);
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}
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/**
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* builds a new Net_DNS2_Packet_Response object
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*
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* @param string $data binary DNS packet
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* @param integer $size the length of the DNS packet
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*
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* @return boolean
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* @throws Net_DNS2_Exception
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* @access public
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*
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*/
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public function set($data, $size)
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{
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//
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// store the full packet
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//
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$this->rdata = $data;
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$this->rdlength = $size;
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//
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// parse the header
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//
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// we don't bother checking the size earlier, because the first thing the
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// header class does, is check the size and throw and exception if it's
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// invalid.
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//
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$this->header = new Net_DNS2_Header($this);
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//
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// if the truncation bit is set, then just return right here, because the
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// rest of the packet is probably empty; and there's no point in processing
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// anything else.
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//
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// we also don't need to worry about checking to see if the the header is
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// null or not, since the Net_DNS2_Header() constructor will throw an
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// exception if the packet is invalid.
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//
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if ($this->header->tc == 1) {
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return false;
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}
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//
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// parse the questions
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//
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for ($x = 0; $x < $this->header->qdcount; ++$x) {
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$this->question[$x] = new Net_DNS2_Question($this);
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}
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//
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// parse the answers
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//
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for ($x = 0; $x < $this->header->ancount; ++$x) {
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$o = Net_DNS2_RR::parse($this);
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if (!is_null($o)) {
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$this->answer[] = $o;
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}
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}
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//
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// parse the authority section
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//
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for ($x = 0; $x < $this->header->nscount; ++$x) {
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$o = Net_DNS2_RR::parse($this);
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if (!is_null($o)) {
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$this->authority[] = $o;
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}
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}
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//
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// parse the additional section
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//
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for ($x = 0; $x < $this->header->arcount; ++$x) {
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$o = Net_DNS2_RR::parse($this);
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if (!is_null($o)) {
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$this->additional[] = $o;
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}
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}
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return true;
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}
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}
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