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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\Model\Message;
use React\Dns\Protocol\BinaryDumper;
use React\Dns\Protocol\Parser;
use React\EventLoop\Loop;
use React\EventLoop\LoopInterface;
use React\Promise\Deferred;

/**
 * Send DNS queries over a UDP transport.
 *
 * This is the main class that sends a DNS query to your DNS server and is used
 * internally by the `Resolver` for the actual message transport.
 *
 * For more advanced usages one can utilize this class directly.
 * The following example looks up the `IPv6` address for `igor.io`.
 *
 * ```php
 * $executor = new UdpTransportExecutor('8.8.8.8:53');
 *
 * $executor->query(
 *     new Query($name, Message::TYPE_AAAA, Message::CLASS_IN)
 * )->then(function (Message $message) {
 *     foreach ($message->answers as $answer) {
 *         echo 'IPv6: ' . $answer->data . PHP_EOL;
 *     }
 * }, 'printf');
 * ```
 *
 * See also the [fourth example](examples).
 *
 * Note that this executor does not implement a timeout, so you will very likely
 * want to use this in combination with a `TimeoutExecutor` like this:
 *
 * ```php
 * $executor = new TimeoutExecutor(
 *     new UdpTransportExecutor($nameserver),
 *     3.0
 * );
 * ```
 *
 * Also note that this executor uses an unreliable UDP transport and that it
 * does not implement any retry logic, so you will likely want to use this in
 * combination with a `RetryExecutor` like this:
 *
 * ```php
 * $executor = new RetryExecutor(
 *     new TimeoutExecutor(
 *         new UdpTransportExecutor($nameserver),
 *         3.0
 *     )
 * );
 * ```
 *
 * Note that this executor is entirely async and as such allows you to execute
 * any number of queries concurrently. You should probably limit the number of
 * concurrent queries in your application or you're very likely going to face
 * rate limitations and bans on the resolver end. For many common applications,
 * you may want to avoid sending the same query multiple times when the first
 * one is still pending, so you will likely want to use this in combination with
 * a `CoopExecutor` like this:
 *
 * ```php
 * $executor = new CoopExecutor(
 *     new RetryExecutor(
 *         new TimeoutExecutor(
 *             new UdpTransportExecutor($nameserver),
 *             3.0
 *         )
 *     )
 * );
 * ```
 *
 * > Internally, this class uses PHP's UDP sockets and does not take advantage
 *   of [react/datagram](https://github.com/reactphp/datagram) purely for
 *   organizational reasons to avoid a cyclic dependency between the two
 *   packages. Higher-level components should take advantage of the Datagram
 *   component instead of reimplementing this socket logic from scratch.
 */
final class UdpTransportExecutor implements ExecutorInterface
{
    private $nameserver;
    private $loop;
    private $parser;
    private $dumper;

/**
     * maximum UDP packet size to send and receive
     *
     * @var int
     */
    private $maxPacketSize = 512;

/**
     * @param string         $nameserver
     * @param ?LoopInterface $loop
     */
    public function __construct($nameserver, $loop = null)
    {
        if (\strpos($nameserver, '[') === false && \substr_count($nameserver, ':') >= 2 && \strpos($nameserver, '://') === false) {
            // several colons, but not enclosed in square brackets => enclose IPv6 address in square brackets
            $nameserver = '[' . $nameserver . ']';
        }

$parts = \parse_url((\strpos($nameserver, '://') === false ? 'udp://' : '') . $nameserver);
        if (!isset($parts['scheme'], $parts['host']) || $parts['scheme'] !== 'udp' || @\inet_pton(\trim($parts['host'], '[]')) === false) {
            throw new \InvalidArgumentException('Invalid nameserver address given');
        }

if ($loop !== null && !$loop instanceof LoopInterface) { // manual type check to support legacy PHP < 7.1
            throw new \InvalidArgumentException('Argument #2 ($loop) expected null|React\EventLoop\LoopInterface');
        }

$this->nameserver = 'udp://' . $parts['host'] . ':' . (isset($parts['port']) ? $parts['port'] : 53);
        $this->loop = $loop ?: Loop::get();
        $this->parser = new Parser();
        $this->dumper = new BinaryDumper();
    }

public function query(Query $query)
    {
        $request = Message::createRequestForQuery($query);

$queryData = $this->dumper->toBinary($request);
        if (isset($queryData[$this->maxPacketSize])) {
            return \React\Promise\reject(new \RuntimeException(
                'DNS query for ' . $query->describe() . ' failed: Query too large for UDP transport',
                \defined('SOCKET_EMSGSIZE') ? \SOCKET_EMSGSIZE : 90
            ));
        }

// UDP connections are instant, so try connection without a loop or timeout
        $errno = 0;
        $errstr = '';
        $socket = @\stream_socket_client($this->nameserver, $errno, $errstr, 0);
        if ($socket === false) {
            return \React\Promise\reject(new \RuntimeException(
                'DNS query for ' . $query->describe() . ' failed: Unable to connect to DNS server ' . $this->nameserver . ' ('  . $errstr . ')',
                $errno
            ));
        }

// set socket to non-blocking and immediately try to send (fill write buffer)
        \stream_set_blocking($socket, false);

\set_error_handler(function ($_, $error) use (&$errno, &$errstr) {
            // Write may potentially fail, but most common errors are already caught by connection check above.
            // Among others, macOS is known to report here when trying to send to broadcast address.
            // This can also be reproduced by writing data exceeding `stream_set_chunk_size()` to a server refusing UDP data.
            // fwrite(): send of 8192 bytes failed with errno=111 Connection refused
            \preg_match('/errno=(\d+) (.+)/', $error, $m);
            $errno = isset($m[1]) ? (int) $m[1] : 0;
            $errstr = isset($m[2]) ? $m[2] : $error;
        });

$written = \fwrite($socket, $queryData);

\restore_error_handler();

if ($written !== \strlen($queryData)) {
            return \React\Promise\reject(new \RuntimeException(
                'DNS query for ' . $query->describe() . ' failed: Unable to send query to DNS server ' . $this->nameserver . ' ('  . $errstr . ')',
                $errno
            ));
        }

$loop = $this->loop;
        $deferred = new Deferred(function () use ($loop, $socket, $query) {
            // cancellation should remove socket from loop and close socket
            $loop->removeReadStream($socket);
            \fclose($socket);

throw new CancellationException('DNS query for ' . $query->describe() . ' has been cancelled');
        });

$max = $this->maxPacketSize;
        $parser = $this->parser;
        $nameserver = $this->nameserver;
        $loop->addReadStream($socket, function ($socket) use ($loop, $deferred, $query, $parser, $request, $max, $nameserver) {
            // try to read a single data packet from the DNS server
            // ignoring any errors, this is uses UDP packets and not a stream of data
            $data = @\fread($socket, $max);
            if ($data === false) {
                return;
            }

try {
                $response = $parser->parseMessage($data);
            } catch (\Exception $e) {
                // ignore and await next if we received an invalid message from remote server
                // this may as well be a fake response from an attacker (possible DOS)
                return;
            }

// ignore and await next if we received an unexpected response ID
            // this may as well be a fake response from an attacker (possible cache poisoning)
            if ($response->id !== $request->id) {
                return;
            }

// we only react to the first valid message, so remove socket from loop and close
            $loop->removeReadStream($socket);
            \fclose($socket);

if ($response->tc) {
                $deferred->reject(new \RuntimeException(
                    'DNS query for ' . $query->describe() . ' failed: The DNS server ' . $nameserver . ' returned a truncated result for a UDP query',
                    \defined('SOCKET_EMSGSIZE') ? \SOCKET_EMSGSIZE : 90
                ));
                return;
            }

$deferred->resolve($response);
        });

return $deferred->promise();
    }
}

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