update dependencies and add voku\AntiXSS

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

composer.json

@@ -46,7 +46,8 @@
 		"phpmailer/phpmailer": "~6.0",
 		"monolog/monolog": "^1.24",
 		"robthree/twofactorauth": "^1.6",
-		"froxlor/idna-convert-legacy": "^2.1"
+		"froxlor/idna-convert-legacy": "^2.1",
+		"voku/anti-xss": "^4.1"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "8.4.1",

lib/Froxlor/PhpHelper.php

@@ -223,9 +223,17 @@ class PhpHelper
 	 */
 	public static function gethostbynamel6($host, $try_a = true)
 	{
-		$dns6 = dns_get_record($host, DNS_AAAA);
+		$dns6 = @dns_get_record($host, DNS_AAAA);
+		if (!is_array($dns6)) {
+			// no record or failed to check
+			$dns6 = [];
+		}
 		if ($try_a == true) {
-			$dns4 = dns_get_record($host, DNS_A);
+			$dns4 = @dns_get_record($host, DNS_A);
+			if (!is_array($dns4)) {
+				// no record or failed to check
+				$dns4 = [];
+			}
 			$dns = array_merge($dns4, $dns6);
 		} else {
 			$dns = $dns6;
@@ -382,4 +390,21 @@ class PhpHelper
 		}
 		return $returnval;
 	}
+
+	/**
+	 * function to check a super-global passed by reference
+	 * so it gets automatically updated
+	 *
+	 * @param array $global
+	 * @param \voku\helper\AntiXSS $antiXss
+	 */
+	public static function cleanGlobal(&$global = [], &$antiXss)
+	{
+		if (isset($global) && ! empty($global)) {
+			$tmp = $global;
+			foreach ($tmp as $index => $value) {
+				$global[$index] = $antiXss->xss_clean($value);
+			}
+		}
+	}
 }