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每日一搏 | 100行 PHP 代码实现 socks5 代理服务器

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

```php 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, "/x05/x00");     $data = stream_socket_recvfrom($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, "/x05/x00/x00/x01/x00/x00/x00/x00/x00/x00");     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)); } ```

原文  http://my.oschina.net/u/142205/blog/666545?fromerr=cObOoomU
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