利用http协议实现图片窃取

在http协议里有一个referer，用来标示站点来源，大家都遇到这样的情况。转载了一篇博客，图片显示不正常，就和头信息里这个有关

原理：在webserver里面。依据http协议里面refered头信息来推断。来自站外。就转跳到一个非常小的防盗图片里面。

如何实现防盗链？

1 打开apache ，重写模块mod_rewrite

apache配置文件

2 在须要防盗的站点或文件夹，写.htaccess文件并指定防盗规则，自然分析refered信息

  是图片，referer与localhost不匹配时进行重写，统一rewrite到一个图片

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} .*\.(jpg|jpeg|gif|png) [NC]
RewriteCond %{HTTP_REFERER} !localhost [NC]
RewriteRule .*  no.png

<?

php /* PHP+socket编程　发送HTTP请求 要求能　模拟下载，注冊，登陆,批量发帖 */ // http请求类的接口 interface Proto { // 连接url function conn($url); //发送get查询 function get(); // 发送post查询 function post(); // 关闭连接 function close(); } class Http implements Proto { const CRLF = "\r\n"; protected $errno = -1; protected $errstr = ''; protected $response = ''; protected $url = null; protected $version = 'HTTP/1.1'; protected $fh = null; protected $line = array(); protected $header = array(); protected $body = array(); public function __construct($url) { $this->conn($url); $this->setHeader('Host: ' . $this->url['host']); } // 此方法负责写请求行 protected function setLine($method) { $this->line[0] = $method . ' ' . $this->url['path'] . '?

' .$this->url['query'] . ' '. $this->version; } // 此方法负责写头信息 public function setHeader($headerline) { $this->header[] = $headerline; } // 此方法负责写主体信息 protected function setBody($body) { $this->body[] = http_build_query($body); } // 连接url public function conn($url) { $this->url = parse_url($url); //　推断端口 if(!isset($this->url['port'])) { $this->url['port'] = 80; } //　推断query if(!isset($this->url['query'])) { $this->url['query'] = ''; } $this->fh = fsockopen($this->url['host'],$this->url['port'],$this->errno,$this->errstr,3); } //构造get请求的数据 public function get() { $this->setLine('GET'); $this->request(); return $this->response; } // 构造post查询的数据 public function post($body = array()) { $this->setLine('POST'); // 设计content-type $this->setHeader('Content-type: application/x-www-form-urlencoded'); // 设计主体信息,比GET不一样的地方 $this->setBody($body); // 计算content-length $this->setHeader('Content-length: ' . strlen($this->body[0])); $this->request(); return $this->response; } // 真正请求 public function request() { // 把请求行。头信息，实体信息　放在一个数组里，便于拼接 $req = array_merge($this->line,$this->header,array(''),$this->body,array('')); //print_r($req); $req = implode(self::CRLF,$req); //echo $req; exit; fwrite($this->fh,$req); while(!feof($this->fh)) { $this->response .= fread($this->fh,1024); } $this->close(); //　关闭连接 } // 关闭连接 public function close() { fclose($this->fh); } } /* $url = 'http://news.163.com/13/0613/09/9187CJ4C00014JB6.html'; $http = new Http($url); echo $http->get(); */ /* set_time_limit(0); $url = 'http://liangyue.net.cn/0523/?

'; for($i=1;$i<100;$i++) { $str = str_shuffle('abcdefghijklmnopqrst0776656'); $tit = substr($str,0,5); $con = substr($str,6,8); $http = new Http($url); $http->post(array('tit'=>$tit,'con'=>$con,'submit'=>'留言')); echo $tit,'-----------',$con,'<br />'; usleep(2000); } */

本文转自mfrbuaa博客园博客，原文链接：http://www.cnblogs.com/mfrbuaa/p/5340286.html，如需转载请自行联系原作者