找到get_client_ip()函数：

// 获取客户端IP地址
function get_client_ip(){
   if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
       $ip = getenv("HTTP_CLIENT_IP");
   else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
       $ip = getenv("HTTP_X_FORWARDED_FOR");
   else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
       $ip = getenv("REMOTE_ADDR");
   else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
       $ip = $_SERVER['REMOTE_ADDR'];
   else
       $ip = "unknown";
   return($ip);
}

果然没过滤，看了下很多地方用到这个函数。

比如：

if($_REQUEST['act'] == 'verify')
{
	$id = intval($_REQUEST['id']);
	$user_info  = $GLOBALS['db']->getRow("select * from ".DB_PREFIX."user where id = ".$id);
	if(!$user_info)
	{
		showErr($GLOBALS['lang']['NO_THIS_USER']);
	}
	$verify = $_REQUEST['code'];
	if($user_info['verify'] == $verify)
	{
		//成功
		$_SESSION['user_info'] = $user_info;
		$GLOBALS['db']->query("update ".DB_PREFIX."user set login_ip = '".get_client_ip()."',login_time= ".get_gmtime().",verify = '',is_effect = 1 where id =".$user_info['id']);
		$GLOBALS['db']->query("update ".DB_PREFIX."mail_list set is_effect = 1 where mail_address ='".$user_info['email']."'");
		$GLOBALS['db']->query("update ".DB_PREFIX."mobile_list set is_effect = 1 where mobile ='".$user_info['mobile']."'");
		showSuccess($GLOBALS['lang']['VERIFY_SUCCESS'],0,APP_ROOT."/");
}

团购系统嘛，其实不用看代码，登陆的这些地方必定会用这个函数。

果断的，登陆的时候在http头里面加了个client_ip，值为127′