<?php

/**
 * [Discuz!] (C)2001-2099 Discuz! Team
 * This is NOT a freeware, use is subject to license terms
 * https://license.discuz.vip
 */

if(!defined('IN_DISCUZ')) {
	exit('Access Denied');
}

class ip_getter_dnslist {

	public static function get($s) {
		if(empty($s['header']) || empty($s['list'])) {
			return $_SERVER['REMOTE_ADDR'];
		}
		$ip = $_SERVER['REMOTE_ADDR'];
		$rdns = gethostbyaddr($ip);
		foreach($s['list'] as $host) {
			if(preg_match('/'.$host.'$/i', $rdns)) {
				if($s['header'] != 'HTTP_X_FORWARDED_FOR') {
					$ip = ip::validate_ip($_SERVER[$s['header']]) ? $_SERVER[$s['header']] : $ip;
				} else {
					if(strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',') > 0) {
						$exp = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
						$ip = ip::validate_ip(trim($exp[0])) ? $exp[0] : $ip;
					} else {
						$ip = ip::validate_ip($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $ip;
					}
				}
			}
		}
		return $ip;
	}

}