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Edit File: TALINK.php

<?php

/**
 * DNS Library for handling lookups and updates. 
 *
 * Copyright (c) 2020, Mike Pultz <mike@mikepultz.com>. All rights reserved.
 *
 * @category  Networking
 * @package   Net_DNS2
 * @author    Mike Pultz <mike@mikepultz.com>
 * @copyright 2020 Mike Pultz <mike@mikepultz.com>
 * @license   http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @link      https://netdns2.com/
 * @since     File available since Release 1.2.0
 *
 */

/**
 * TALINK Resource Record - DNSSEC Trust Anchor
 *
 * http://tools.ietf.org/id/draft-ietf-dnsop-dnssec-trust-history-00.txt
 *
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *    /                   PREVIOUS                    /
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *    /                     NEXT                      /
 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *
 */
class Net_DNS2_RR_TALINK extends Net_DNS2_RR
{
    /*
     * the previous domain name
     */
    public $previous;

/*
     * the next domain name
     */
    public $next;

/**
     * method to return the rdata portion of the packet as a string
     *
     * @return  string
     * @access  protected
     *
     */
    protected function rrToString()
    {
        return $this->cleanString($this->previous) . '. ' . 
            $this->cleanString($this->next) . '.';
    }

/**
     * parses the rdata portion from a standard DNS config line
     *
     * @param array $rdata a string split line of values for the rdata
     *
     * @return boolean
     * @access protected
     *
     */
    protected function rrFromString(array $rdata)
    {
        $this->previous = $this->cleanString($rdata[0]);
        $this->next     = $this->cleanString($rdata[1]);

return true;
    }

/**
     * parses the rdata of the Net_DNS2_Packet object
     *
     * @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet to parse the RR from
     *
     * @return boolean
     * @access protected
     *
     */
    protected function rrSet(Net_DNS2_Packet &$packet)
    {
        if ($this->rdlength > 0) {

$offset         = $packet->offset;

$this->previous = Net_DNS2_Packet::label($packet, $offset);
            $this->next     = Net_DNS2_Packet::label($packet, $offset);

return true;
        }

return false;
    }

/**
     * returns the rdata portion of the DNS packet
     *
     * @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet use for
     *                                 compressed names
     *
     * @return mixed                   either returns a binary packed
     *                                 string or null on failure
     * @access protected
     *
     */
    protected function rrGet(Net_DNS2_Packet &$packet)
    {
        if ( (strlen($this->previous) > 0) || (strlen($this->next) > 0) ) {

$data = chr(strlen($this->previous)) . $this->previous . 
                chr(strlen($this->next)) . $this->next;

$packet->offset += strlen($data);

return $data;
        }

return null;
    }
}