From 8b9932218ffa0e53b05cad5bc769f9317687e6da Mon Sep 17 00:00:00 2001
From: Bui <bui@bui.pm>
Date: Mon, 6 Oct 2014 03:37:13 +0900
Subject: add forward-confirmed reverse DNS

---
 inc/functions.php | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'inc/functions.php')

diff --git a/inc/functions.php b/inc/functions.php
index 357666d6..8c5f46b9 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -2265,6 +2265,7 @@ function rDNS($ip_addr) {
 
 	if (!$config['dns_system']) {
 		$host = gethostbyaddr($ip_addr);
+		$isip = filter_var($host, FILTER_VALIDATE_IP);
 	} else {
 		$resp = shell_exec_error('host -W 1 ' . $ip_addr);
 		if (preg_match('/domain name pointer ([^\s]+)$/', $resp, $m))
@@ -2273,6 +2274,10 @@ function rDNS($ip_addr) {
 			$host = $ip_addr;
 	}
 
+	if ($config['fcrdns'] && !$isip && gethostbyname($host) != $ip_addr) {
+		$host = $ip_addr;
+	}
+
 	if ($config['cache']['enabled'])
 		cache::set('rdns_' . $ip_addr, $host);
 
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