100行PHP代码实现socks5代理服务器

<p style="text-align: left; padding-bottom: 0px; widows: 1; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 8px 0px; padding-left: 0px; letter-spacing: 0px; padding-right: 0px; font: 12px/22px 'Microsoft YaHei',Verdana,sans-serif,宋体; word-wrap: break-word; white-space: normal; color: rgb(51,51,51); word-break: break-all; word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">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。

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,$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));
}

（编辑：李大同）

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