First commit

uc_server/lib/ucip_getter_dnslist.class.php

@@ -0,0 +1,35 @@
+<?php
+
+/*
+	[UCenter] (C)2001-2099 Comsenz Inc.
+	This is NOT a freeware, use is subject to license terms
+
+	$Id: ucip_getter_dnslist.class.php 969 2019-12-19 12:00:00Z community $
+*/
+
+class ucip_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') {
+					$ip = ucip::validate_ip($_SERVER[$s['header']]) ? $_SERVER[$s['header']] : $ip;
+				} else {
+					if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ",") > 0) {
+						$exp = explode(",", $_SERVER['HTTP_X_FORWARDED_FOR']);
+						$ip = ucip::validate_ip(trim($exp[0])) ? $exp[0] : $ip;
+					} else {
+						$ip = ucip::validate_ip($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $ip;
+					}
+				}
+			}
+		}
+		return $ip;
+	}
+
+}