curl发出请求的文件fake_ip.php: 

代码 <?php 

$ch = curl_init(); 

$url = "http://localhost/target_ip.php"; 

$header = array( 

'CLIENT-IP:58.68.44.61', 

'X-FORWARDED-FOR:58.68.44.61', 

); 

curl_setopt($ch, CURLOPT_URL, $url); 

curl_setopt($ch, CURLOPT_HTTPHEADER, $header); 

curl_setopt($ch, CURLOPT_RETURNTRANSFER,true); 

$page_content = curl_exec($ch); 

curl_close($ch); 

echo $page_content; 

?> 

请求的目标文件target_ip.php: 

<?php 

echo getenv('HTTP_CLIENT_IP'); 

echo getenv('HTTP_X_FORWARDED_FOR'); 

echo getenv('REMOTE_ADDR'); 

?> 

目标文件target_ip里面的IP打印顺序是目前很多开源系统的IP获取顺序 

访问fake_ip.php,看到结果: 

58.68.44.61 

58.68.44.61 

127.0.0.1 

实例 

CURL确实很强悍，可以伪造IP和来源。 

1.php 请求 2.php 。 

1.php代码： 

$ch = curl_init(); 

curl_setopt($ch, CURLOPT_URL, "http://localhost/2.php"); 

curl_setopt($ch, CURLOPT_HTTPHEADER, array('X-FORWARDED-FOR:8.8.8.8', 'CLIENT-IP:8.8.8.8')); //构造IP 

curl_setopt($ch, CURLOPT_REFERER, "http://www.jb51.net/ "); //构造来路 

curl_setopt($ch, CURLOPT_HEADER, 1); 

$out = curl_exec($ch); 

curl_close($ch); 

2.php代码如下： 

function getClientIp() { 

if (!empty($_SERVER["HTTP_CLIENT_IP"])) 

$ip = $_SERVER["HTTP_CLIENT_IP"]; 

else if (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) 

$ip = $_SERVER["HTTP_X_FORWARDED_FOR"]; 

else if (!empty($_SERVER["REMOTE_ADDR"])) 

$ip = $_SERVER["REMOTE_ADDR"]; 

else 

$ip = "err"; 

return $ip; 

} 

echo "IP: " . getClientIp() . ""; 

echo "referer: " . $_SERVER["HTTP_REFERER"];