PHP 简易socks5客户端。支持密码方式验证

socks5.php

<?php
/**
 * PHP 简易socks5客户端。支持密码方式验证
 */


$user = 'root';
$pass = '123456';

$port = 80;
$host = 'www.baidu.com';


$socks5 =  new socks5('127.0.0.1', 1088);
$socks5->setSocksAuth($user, $pass);
$socks5->connect('www.baidu.com', 80);

if (empty($socks5->lastError)) {
    $data = "GET / HTTP/1.1\r\n".
        "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36\r\n".
        "Connection: close\r\n".
        "Host: www.baidu.com\r\n\r\n";

    $socks5->send($data);

    $response = $socks5->receive();
    echo $response;
} else {
    echo $socks5->lastError;
}

class socks5 {
    protected $socksHost = '';
    protected $socksPort = 1080;

    protected $socksAuth = '';

    protected $socks;

    protected $timeout = 5;

    public $lastError = '';

    public function __construct($socksHost, $socksPort = 1080)
    {
        $this->socksHost = $socksHost;
        $this->socksPort = $socksPort;
    }


    public function setSocksAuth($username, $password)
    {
        $this->socksAuth = pack('C2', 0x01, strlen($username)) . $username . pack('C', strlen($password)) . $password;
    }

    public function connect($host, $port)
    {
        $chrPort = chr($port >> 8) . chr($port & 255);
        $address = gethostbyname($host);
        $address = implode('', array_map('chr', explode('.', $address)));
        $target = "\5\1\0\1" . $address . $chrPort;


        $fsock = fsockopen($this->socksHost, $this->socksPort);
        socket_set_timeout($fsock, $this->timeout);

        $request = "\5\1";
        if (empty($this->socksAuth)) {
            $request .= "\0";
        } else {
            $request .= "\2";
        }

        if (fputs($fsock, $request) != strlen($request)) {
            $this->lastError = '1. 数据发送失败！';
            return false;
        }

        $firstResponse = fgets($fsock, 3);
        if (strlen($firstResponse) != 2 && ($firstResponse != "\5\0" || $firstResponse != "\5\2")) {
            $this->lastError = '2. 数据接收异常！接收：'.$this->bin($firstResponse);
            return false;
        }

        if ($firstResponse == "\5\2") {
            if (empty($this->socksAuth)) {
                $this->lastError = '3. 未设置用户名和密码';
                return false;
            } else {
                fputs($fsock, $this->socksAuth);
                $secondResponse = fgets($fsock, 3);
                if ($secondResponse != "\1\0") {
                    $this->lastError = '3. 用户名和密码不正确';
                    return false;
                }
            }
        }

        if ($firstResponse == pack("C*", 5, 255)) {
             $this->lastError = '4. 请检查服务器是否需要用户名/密码验证';
             return false;
        }

        if (fputs($fsock, $target) != strlen($target)) {
             $this->lastError = '4. 数据包未能成功发送';
             return false;
        }

        $response = fgets($fsock, 5);

        if ($response != "\5\0\0\1" ) {
             $this->lastError = '5. 目标服务器'.$host.':'.$port.'连接失败';
             return false;
        }

        $this->socks = $fsock;

        return true;
    }

    static public function bin($response) {
        return implode(' ', unpack('C*', $response));
    }

    static public function output($response) {
        echo self::bin($response).PHP_EOL;
    }


    public function send($data)
    {
        return fwrite($this->socks, $data);
    }

    public function receive()
    {
        $response = '';
        while (!feof($this->socks)) {
            $response .= fread($this->socks, 1024);
        }
        if ($response) {
            $response = substr($response, 6);
        }
        return $response;
    }

}