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);
$header = explode("\r\n",substr($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,$html){
preg_match_all("/<link[\s\S]*?href=['\"](.*?[.]css.*?)[\"'][\s\S]*?>/i",$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;
}
?>