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Edit File : HostsFileExecutor.php \| Size : 2.98 KB
<?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; } } } Back

Edit File : HostsFileExecutor.php | Size : 2.98 KB

<?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;
        }
    }
}

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