172 lines
4.2 KiB
PHP
172 lines
4.2 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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* NSEC3PARAM Resource Record - RFC5155 section 4.2
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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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* | Hash Alg. | Flags | Iterations |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Salt Length | Salt /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*/
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class Net_DNS2_RR_NSEC3PARAM extends Net_DNS2_RR
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{
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/*
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* Algorithm to use
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*
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*/
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public $algorithm;
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/*
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* flags
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*/
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public $flags;
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/*
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* defines the number of additional times the hash is performed.
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*/
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public $iterations;
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/*
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* the length of the salt- not displayed
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*/
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public $salt_length;
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/*
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* the salt
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*/
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public $salt;
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/**
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* method to return the rdata portion of the packet as a string
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*
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* @return string
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* @access protected
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*
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*/
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protected function rrToString()
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{
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$out = $this->algorithm . ' ' . $this->flags . ' ' . $this->iterations . ' ';
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//
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// per RFC5155, the salt_length value isn't displayed, and if the salt
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// is empty, the salt is displayed as "-"
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//
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if ($this->salt_length > 0) {
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$out .= $this->salt;
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} else {
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$out .= '-';
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}
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return $out;
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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->algorithm = array_shift($rdata);
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$this->flags = array_shift($rdata);
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$this->iterations = array_shift($rdata);
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$salt = array_shift($rdata);
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if ($salt == '-') {
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$this->salt_length = 0;
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$this->salt = '';
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} else {
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$this->salt_length = strlen(pack('H*', $salt));
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$this->salt = strtoupper($salt);
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}
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return true;
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}
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/**
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* parses the rdata of the Net_DNS2_Packet object
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*
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* @param Net_DNS2_Packet &$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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$x = unpack('Calgorithm/Cflags/niterations/Csalt_length', $this->rdata);
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$this->algorithm = $x['algorithm'];
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$this->flags = $x['flags'];
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$this->iterations = $x['iterations'];
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$this->salt_length = $x['salt_length'];
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if ($this->salt_length > 0) {
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$x = unpack('H*', substr($this->rdata, 5, $this->salt_length));
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$this->salt = strtoupper($x[1]);
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}
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return true;
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}
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return false;
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}
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/**
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* returns the rdata portion of the DNS packet
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*
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* @param Net_DNS2_Packet &$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 &$packet)
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{
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$salt = pack('H*', $this->salt);
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$this->salt_length = strlen($salt);
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$data = pack(
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'CCnC',
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$this->algorithm, $this->flags, $this->iterations, $this->salt_length
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) . $salt;
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$packet->offset += strlen($data);
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return $data;
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}
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}
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