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Directory >> /var/www/html/back/vendor/react/dns/src/Query/

File / Folder	Size	Action
.	-
CachingExecutor.php	2.672KB	edt ren
CancellationException.php	0.097KB	edt ren
CoopExecutor.php	3.352KB	edt ren
ExecutorInterface.php	1.427KB	edt ren
FallbackExecutor.php	1.679KB	edt ren
HostsFileExecutor.php	2.979KB	edt ren
Query.php	1.953KB	edt ren
RetryExecutor.php	2.763KB	edt ren
SelectiveTransportExecu...	3.048KB	edt ren
TcpTransportExecutor.php	13.635KB	edt ren
TimeoutException.php	0.085KB	edt ren
TimeoutExecutor.php	2.694KB	edt ren
UdpTransportExecutor.php	8.344KB	edt ren

<?php

namespace React\Dns\Query;

use React\Dns\Config\HostsFile;
use React\Dns\Model\Message;
use React\Dns\Model\Record;
use React\Promise;

/**
 * Resolves hosts from the given HostsFile or falls back to another executor
 *
 * If the host is found in the hosts file, it will not be passed to the actual
 * DNS executor. If the host is not found in the hosts file, it will be passed
 * to the DNS executor as a fallback.
 */
final class HostsFileExecutor implements ExecutorInterface
{
    private $hosts;
    private $fallback;

public function __construct(HostsFile $hosts, ExecutorInterface $fallback)
    {
        $this->hosts = $hosts;
        $this->fallback = $fallback;
    }

public function query(Query $query)
    {
        if ($query->class === Message::CLASS_IN && ($query->type === Message::TYPE_A || $query->type === Message::TYPE_AAAA)) {
            // forward lookup for type A or AAAA
            $records = array();
            $expectsColon = $query->type === Message::TYPE_AAAA;
            foreach ($this->hosts->getIpsForHost($query->name) as $ip) {
                // ensure this is an IPv4/IPV6 address according to query type
                if ((strpos($ip, ':') !== false) === $expectsColon) {
                    $records[] = new Record($query->name, $query->type, $query->class, 0, $ip);
                }
            }

if ($records) {
                return Promise\resolve(
                    Message::createResponseWithAnswersForQuery($query, $records)
                );
            }
        } elseif ($query->class === Message::CLASS_IN && $query->type === Message::TYPE_PTR) {
            // reverse lookup: extract IPv4 or IPv6 from special `.arpa` domain
            $ip = $this->getIpFromHost($query->name);

if ($ip !== null) {
                $records = array();
                foreach ($this->hosts->getHostsForIp($ip) as $host) {
                    $records[] = new Record($query->name, $query->type, $query->class, 0, $host);
                }

if ($records) {
                    return Promise\resolve(
                        Message::createResponseWithAnswersForQuery($query, $records)
                    );
                }
            }
        }

return $this->fallback->query($query);
    }

private function getIpFromHost($host)
    {
        if (substr($host, -13) === '.in-addr.arpa') {
            // IPv4: read as IP and reverse bytes
            $ip = @inet_pton(substr($host, 0, -13));
            if ($ip === false || isset($ip[4])) {
                return null;
            }

return inet_ntop(strrev($ip));
        } elseif (substr($host, -9) === '.ip6.arpa') {
            // IPv6: replace dots, reverse nibbles and interpret as hexadecimal string
            $ip = @inet_ntop(pack('H*', strrev(str_replace('.', '', substr($host, 0, -9)))));
            if ($ip === false) {
                return null;
            }

return $ip;
        } else {
            return null;
        }
    }
}