From 08a5e0d3bf0b21b2c6976416ad25be909ca43503 Mon Sep 17 00:00:00 2001
From: Zankaria <zankaria.auxa@mailu.io>
Date: Thu, 24 Apr 2025 00:59:29 +0200
Subject: [PATCH] functions.php: remove checkDNSBL and DNS functions

---
 inc/functions.php | 109 ----------------------------------------------
 1 file changed, 109 deletions(-)

diff --git a/inc/functions.php b/inc/functions.php
index 52a7ec20..e568874f 100755
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -1767,61 +1767,6 @@ function buildJavascript() {
 	file_write($config['file_script'], $script);
 }
 
-function checkDNSBL() {
-	global $config;
-
-	if (isIPv6())
-		return; // No IPv6 support yet.
-
-	if (!isset($_SERVER['REMOTE_ADDR']))
-		return; // Fix your web server configuration
-
-	if (preg_match("/^(::(ffff:)?)?(127\.|192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.|0\.|255\.)/", $_SERVER['REMOTE_ADDR']))
-		return; // It's pointless to check for local IP addresses in dnsbls, isn't it?
-
-	if (in_array($_SERVER['REMOTE_ADDR'], $config['dnsbl_exceptions']))
-		return;
-
-	$ipaddr = ReverseIPOctets($_SERVER['REMOTE_ADDR']);
-
-	foreach ($config['dnsbl'] as $blacklist) {
-		if (!is_array($blacklist))
-			$blacklist = array($blacklist);
-
-		if (($lookup = str_replace('%', $ipaddr, $blacklist[0])) == $blacklist[0])
-			$lookup = $ipaddr . '.' . $blacklist[0];
-
-		if (!$ip = DNS($lookup))
-			continue; // not in list
-
-		$blacklist_name = isset($blacklist[2]) ? $blacklist[2] : $blacklist[0];
-
-		if (!isset($blacklist[1])) {
-			// If you're listed at all, you're blocked.
-			error(sprintf($config['error']['dnsbl'], $blacklist_name));
-		} elseif (is_array($blacklist[1])) {
-			foreach ($blacklist[1] as $octet) {
-				if ($ip == $octet || $ip == '127.0.0.' . $octet)
-					error(sprintf($config['error']['dnsbl'], $blacklist_name));
-			}
-		} elseif (is_callable($blacklist[1])) {
-			if ($blacklist[1]($ip))
-				error(sprintf($config['error']['dnsbl'], $blacklist_name));
-		} else {
-			if ($ip == $blacklist[1] || $ip == '127.0.0.' . $blacklist[1])
-				error(sprintf($config['error']['dnsbl'], $blacklist_name));
-		}
-	}
-}
-
-function isIPv6() {
-	return strstr($_SERVER['REMOTE_ADDR'], ':') !== false;
-}
-
-function ReverseIPOctets($ip) {
-	return implode('.', array_reverse(explode('.', $ip)));
-}
-
 function wordfilters(&$body) {
 	global $config;
 
@@ -2512,60 +2457,6 @@ function undoImage(array $post) {
 	}
 }
 
-function rDNS($ip_addr) {
-	global $config;
-
-	if ($config['cache']['enabled'] && ($host = cache::get('rdns_' . $ip_addr))) {
-		return $host;
-	}
-
-	if (!$config['dns_system']) {
-		$host = gethostbyaddr($ip_addr);
-	} else {
-		$resp = shell_exec_error('host -W 3 ' . $ip_addr);
-		if (preg_match('/domain name pointer ([^\s]+)$/', $resp, $m))
-			$host = $m[1];
-		else
-			$host = $ip_addr;
-	}
-
-	$isip = filter_var($host, FILTER_VALIDATE_IP);
-
-	if ($config['fcrdns'] && !$isip && DNS($host) != $ip_addr) {
-		$host = $ip_addr;
-	}
-
-	if ($config['cache']['enabled'])
-		cache::set('rdns_' . $ip_addr, $host);
-
-	return $host;
-}
-
-function DNS($host) {
-	global $config;
-
-	if ($config['cache']['enabled'] && ($ip_addr = cache::get('dns_' . $host))) {
-		return $ip_addr != '?' ? $ip_addr : false;
-	}
-
-	if (!$config['dns_system']) {
-		$ip_addr = gethostbyname($host);
-		if ($ip_addr == $host)
-			$ip_addr = false;
-	} else {
-		$resp = shell_exec_error('host -W 1 ' . $host);
-		if (preg_match('/has address ([^\s]+)$/', $resp, $m))
-			$ip_addr = $m[1];
-		else
-			$ip_addr = false;
-	}
-
-	if ($config['cache']['enabled'])
-		cache::set('dns_' . $host, $ip_addr !== false ? $ip_addr : '?');
-
-	return $ip_addr;
-}
-
 function shell_exec_error($command, $suppress_stdout = false) {
 	global $config, $debug;