php内网探测脚本&简单代理访问

<?php 
$url = isset($_REQUEST['u'])?$_REQUEST['u']:null; 
$ip = isset($_REQUEST['i'])?$_REQUEST['i']:null; 

if($url != null){ 
    $host = getHost($url); 
    echo getCss($host,getHtmlContext($url)); 
}else if($ip != null){ 
    $useIP = substr($ip,0,strripos($ip,".") + 1); 
  ob_start(); 
    for($i=0;$i<256;$i++){ 
      $url = "http://".$useIP.$i; 
    $html = getHtmlContext($url); 
    $title = getTitle(html); 
    $serverType = getHeader("Server"); 
    $status = $html ? "Success": "Fail"; 
    if($html){ 
       echo $url."  >>  ".$title.">>".$serverType." >>".$status."<br/>"; 
    } 
        @ob_flush(); 
        flush(); 
  } 
  ob_end_clean(); 
} 
function getHtmlContext($url){ 
    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_HEADER, TRUE);    //表示需要response header 
    curl_setopt($ch, CURLOPT_NOBODY, FALSE); //表示需要response body 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); 
    curl_setopt($ch, CURLOPT_TIMEOUT, 120); 
    $result = curl_exec($ch); 
  global $header; 
  if($result){ 
       $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE); 
       $header = explode("
",substr($result, 0, $headerSize)); 
       $body = substr($result, $headerSize); 
  } 
    if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == '200') { 
        return $body; 
    } 
    if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == '302') { 
    $location = getHeader("Location"); 
    if(strpos(getHeader("Location"),'http://') == false){ 
      $location = getHost($url).$location; 
    } 
        return getHtmlContext($location); 
    } 
    return NULL; 
} 
function getHeader($name){ 
  global $header; 
  foreach ($header as $loop) { 
     if(strpos($loop,$name) !== false){ 
       return trim(substr($loop,strlen($name)+2)); 
     } 
  } 
} 
function getTitle($html){ 
    preg_match("/<title>(.*?)</title>/i",$html, $matches); 
  return $matches[1]; 
} 
function getHost($url){ 
    preg_match("/^(http://)?([^/]+)/i",$url, $matches); 
    return $matches[0]; 
} 
function getCss($host,$html){ 
    preg_match_all("/<link[sS]*?href=['"](.*?[.]css.*?)["'][sS]*?>/i",$html, $matches); 
  //print_r($matches); 
    foreach($matches[1] as $v){ 
    $cssurl = $v; 
        if(strpos($v,'http://') == false){ 
      $cssurl = $host."/".$v; 
    } 
    $csshtml = "<style>".file_get_contents($cssurl)."</style>"; 
    $html .= $csshtml; 
  } 
  return $html; 
} 
?>