GHS代理PHP简版

转自：http://blog.creke.net/632.html

不知道为什么，我一用HTTP/1.1发送请求，GHS代理就慢得要死。即是改用HTTP/1.0发送请求，如果把服务器端的Header转发给用 户，照样慢的要死。不知道是怎么回事，所以只好写出这个只具备一般浏览功能，连POST都不支持，更别说301转向之类的GHS代理的PHP版本。
采用fsockopen获取数据。
首先，把绑在GHS的域名绑到某PHP空间，并将实际DNS指向该PHP空间。该空间需要支持.htaccess和URL ReWrite。
然后，把下面内容保存为index.php，传到根目录：

<?php
//header不完整，强制为HTTP 1.0
$ghslist=
array(
"72.14.203.121",
"72.14.207.121",
"74.125.43.121",
"74.125.47.121",
"74.125.53.121",
"74.125.77.121",
"74.125.93.121",
"74.125.95.121",
"74.125.113.121",
"216.239.32.21",
"216.239.34.21",
"216.239.36.21",
"216.239.38.21",
);
$ghsnum=rand(0,count($ghslist));

//set_time_limit(600);
//error_reporting(0); //禁止显示错误

//取得所有http header
if (!function_exists('getallheaders'))
{
    function getallheaders()
    {
       foreach ($_SERVER as $name => $value)
       {
           if (substr($name, 0, 5) == 'HTTP_')
           {
               $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
           }
       }
       if (isset($_SERVER['PHP_AUTH_DIGEST'])) {
      $headers['AUTHORIZATION'] = $_SERVER['PHP_AUTH_DIGEST'];
   } elseif (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
      $headers['AUTHORIZATION'] = base64_encode($_SERVER['PHP_AUTH_USER'] . ':' . $_SERVER['PHP_AUTH_PW']);
   }
   if (isset($_SERVER['CONTENT_LENGTH'])) {
      $headers['CONTENT-LENGTH'] = $_SERVER['CONTENT_LENGTH'];
   }
   if (isset($_SERVER['CONTENT_TYPE'])) {
      $headers['CONTENT-TYPE'] = $_SERVER['CONTENT_TYPE'];
   }
       return $headers;
    }
}

  class   http{   

    function   http_fopen($conn_host,$conn_port="80"){
        $fp=fsockopen($conn_host,$conn_port);
        if(!$fp){
                      return   false;
        }
        return $fp;
    }
    //得到查询内容   
    function   http_fget($fp){
     //向服务器发送header
     $fp=$this->sendHeaders($fp);
     //向客户端发送header
   while(!feof($fp))
   {
    $content=fgets($fp);
    if(trim($content)=="")
    {
     break;
    }
    //header($content);
    //echo $content;
   }
   //显示网页内容
   while(!feof($fp))
   {
    echo fgets($fp,128);
   }
    }
    /*//设置头部信息
    function setHeaders()
  {
   $headers=getallheaders();
   //传送访客IP信息
   if (isset($_SERVER['REMOTE_ADDR']))
   {
    $headers['X-Real-IP'] = $_SERVER['REMOTE_ADDR'];
   }
   if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
   {
    $headers['X-Forwarded-For'] = $_SERVER['HTTP_X_FORWARDED_FOR'];
   }
   else
   {
    $headers['X-Forwarded-For'] = $_SERVER['REMOTE_ADDR'];
   }
   return $headers;
  }*/
  //发送头部信息
  function sendHeaders($fp)
  {
   //$requestHeader=$this->setHeaders();
   $theREQUEST_METHOD=isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD']:'GET';
   $http_host=$_SERVER['HTTP_HOST'];//$requestHeader['Host']="creke.net";//在这里更改http请求时远程主机
   $theREQUEST='http://'.$http_host.$_SERVER['REQUEST_URI'];//isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI']:'/';//这里设置请求的URI
   $theSERVER_PROTOCOL='HTTP/1.0';//isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL']:'HTTP/1.1';
   $firstHeader=$theREQUEST_METHOD." ".$theREQUEST." ".$theSERVER_PROTOCOL."\n";
   fputs($fp,$firstHeader);
   fputs($fp,"Host: $http_host\n");
   fputs($fp,"User-agent: ".$_SERVER[’HTTP_USER_AGENT’]."\n");
   /*foreach($requestHeader as $name => $value)
   {
    fputs($fp,"$name: $value\n");
   }*/
   //发送post内容，这里有问题
   if(strtolower($theREQUEST_METHOD)=='post')
   {
    $line = file_get_contents("php://input");
    fputs($fp,$line);
   }
   fputs($fp,"\n");
   return $fp;
  }
  function http_fclose($fp)
  {
   fclose($fp);
  }
  }   

$thehost="ghs.google.com";//$ghslist[$ghsnum];
$http=new   http;
$fp=$http->http_fopen($thehost);
if(!$fp)
{
  echo"sorry,con't   connect";
  exit;
}
//得到返回的结果   
$http->http_fget($fp);
$http->http_fclose($fp);
exit();
?>

然后，在.htaccess添加如下的ReWrite规则：

RewriteEngine   on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule     (.*) /index.php [L]

这样就OK了。
以后每次访问到这个PHP空间的请求，都会通过fsockopen重新请求到ghs.google.com，这样就达到的GHS代理的目的。最后再提醒一次，本PHP版代理只支持网页浏览，对于POST、301转向等GHS应用暂不支持。