137 lines
3.5 KiB
PHP
137 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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* NSEC Resource Record - RFC3845 section 2.1
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*
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* / Next Domain Name /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* / List of Type Bit Map(s) /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*/
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class Net_DNS2_RR_NSEC extends Net_DNS2_RR
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{
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/*
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* The next owner name
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*/
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public $next_domain_name;
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/*
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* identifies the RRset types that exist at the NSEC RR's owner name.
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*/
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public $type_bit_maps = [];
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/**
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* method to return the rdata portion of the packet as a string
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*
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* @return string
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* @access protected
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*
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*/
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protected function rrToString()
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{
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$data = $this->cleanString($this->next_domain_name) . '.';
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foreach ($this->type_bit_maps as $rr) {
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$data .= ' ' . $rr;
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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->next_domain_name = $this->cleanString(array_shift($rdata));
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$this->type_bit_maps = $rdata;
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return true;
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}
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/**
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* parses the rdata of the Net_DNS2_Packet object
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*
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* @param Net_DNS2_Packet &$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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// expand the next domain name
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//
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$offset = $packet->offset;
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$this->next_domain_name = Net_DNS2_Packet::expand($packet, $offset);
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//
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// parse out the RR's from the bitmap
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//
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$this->type_bit_maps = Net_DNS2_BitMap::bitMapToArray(
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substr($this->rdata, $offset - $packet->offset)
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);
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return true;
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}
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return false;
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}
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/**
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* returns the rdata portion of the DNS packet
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*
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* @param Net_DNS2_Packet &$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->next_domain_name) > 0) {
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$data = $packet->compress($this->next_domain_name, $packet->offset);
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$bitmap = Net_DNS2_BitMap::arrayToBitMap($this->type_bit_maps);
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$packet->offset += strlen($bitmap);
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return $data . $bitmap;
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}
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return null;
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}
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}
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