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100行PHP代码实现socks5代理服务器

时间:2024-3-1 12:21     作者:韩俊     分类: PHP


前两天在B站上看到一个小伙纸100元组装个电脑打LOL画质流畅,突发奇想100行代码能(简单)实现个啥好玩的。我主要是做php开发的,于是就有了本文。

当然,由于php(不算swoole扩展)本身不擅长做网络服务端编程,所以这个代理,只是个玩具,离日常使用有点距离。如果想使用稳定可靠的加密(所以能禾斗学上网)代理,可以用这个:https://github.com/momaer/asocks-go也是100来行代码使用go实现。

写的过程中发现php多线程还是难的。比如我开始想每个连接新建一个线程。但这个线程得保存起来(比如保存到数组),比如官方例子中的这个:https://github.com/krakjoe/pthreads/blob/master/examples/SocketServer.php 要放到$clients这个数组里,不然,你试试(curl -L一个要301的地址)就知道出现什么情况了。

这个例子说了in the real world, do something here to ensure clients not running are destroyed 但是,如何把不再运行的连接销毁却没有讲。恩。我试了把$clients放到一个类里,把类传给线程类,然后在线程类要结束时把$clients里对应的连接给unset掉,无果。

那,以下就是使用线程池来实现的代理,按道理讲,退出时池要shutdown(),监听socket也要shutdown的,但百行代码,就不勉强了,随着ctrl + c,就让操作系统来回收资源吧。

php不擅长网络编程体现在哪里呢?首先我用的是stream_socket_XXX相关的函数,为啥不用socket扩展呢?因为socket扩展有问题,参见:https://github.com/krakjoe/pthreads/issues/581 而stream_set_timeout对stream_socket_recvfrom这些高级操作,不起作用,参见:http://php.net/manual/en/function.stream-set-timeout.php 而这些,在写代理时都需要考虑的。比如连接远程目标服务器时,没有超时控制,很容易就线程池跑满了。

测试的话,使用curl即可,对了,目前只支持远程dns解析,为啥呢?因为这个玩具后期可是要实现禾斗学上网的哟: curl --socks5-hostname 127.0.0.1:1080 http://ip.cn

Class Pipe extends Threaded
{
  private $client;
  private $remote;
  public function __construct($client, $remote) 
  {
    $this->client = $client;
    $this->remote = $remote; 
  }
  public function run()
  {
    for ( ; ; ) {
        $data = stream_socket_recvfrom($this->client, 4096);
        if ($data === false || strlen($data) === 0) {
          break;
        } 
        $sendBytes = stream_socket_sendto($this->remote, $data);
        if ($sendBytes <= 0) {
          break;
        }
    }
    stream_socket_shutdown($this->client, STREAM_SHUT_RD);
    stream_socket_shutdown($this->remote, STREAM_SHUT_WR);
  }
}

Class Client extends Threaded
{
  public $fd;
  public function __construct($fd)
  {
    $this->fd = $fd; 
  }

  public function run()
  {
    $data = stream_socket_recvfrom($this->fd, 2);
    $data = unpack('c*', $data);
    if ($data[1] !== 0x05) {
      stream_socket_shutdown($this->fd, STREAM_SHUT_RDWR);
      echo '协议不正确.', PHP_EOL;
      return;
    }
    $nmethods = $data[2];
    $data = stream_socket_recvfrom($this->fd, $nmethods);
    stream_socket_sendto($this->fd, "x05x00");
    $data = stream_socket_recvfrom($this->fd, 4);
    $data = unpack('c*', $data);
    $addressType = $data[4];
    if ($addressType === 0x03) { // domain
      $domainLength = unpack('c', stream_socket_recvfrom($this->fd, 1))[1];
      $data = stream_socket_recvfrom($this->fd, $domainLength + 2);
      $domain = substr($data, 0, $domainLength);
      $port = unpack("n", substr($data, -2))[1];
    } else {
      stream_socket_shutdown($this->fd, STREAM_SHUT_RDWR);
      echo '请使用远程dns解析.', PHP_EOL;
    }

    stream_socket_sendto($this->fd, "x05x00x00x01x00x00x00x00x00x00");
    echo "{$domain}:{$port}", PHP_EOL;
    $remote = stream_socket_client("tcp://{$domain}:{$port}");
    if ($remote === false) {
      stream_socket_shutdown($this->fd, STREAM_SHUT_RDWR);
      return;
    }

    $pool = $this->worker->pipePool;

    $pipe1 = new Pipe($remote, $this->fd);
    $pipe2 = new Pipe($this->fd, $remote);

    $pool->submit($pipe1);
    $pool->submit($pipe2);
  }
}

class ProxyWorker extends Worker
{
  public $pipePool;
  public function __construct($pipePool)
  {
    $this->pipePool = $pipePool;
  }
}

$server = stream_socket_server('tcp://0.0.0.0:1080', $errno, $errstr);
if ($server === false)
  exit($errstr);

$pipePool = new Pool(200, Worker::class);
$pool = new Pool(50, 'ProxyWorker', [$pipePool]);

for( ; ; ) {
  $fd = @stream_socket_accept($server, 60);
  if ($fd === false)
    continue;
  $pool->submit(new Client($fd));
}

标签: php php教程

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