(firewall/npt) add ip/alias input validation

src/www/firewall_nat_npt_edit.php

@@ -95,6 +95,13 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
 
     do_input_validation($pconfig, $reqdfields, $reqdfieldsn, $input_errors);
 
+    if (!is_ipaddroralias($pconfig['src'])) {
+        $input_errors[] = sprintf(gettext("%s is not a valid source IP address or alias."), $pconfig['src']);
+    }
+    if (!is_ipaddroralias($pconfig['dst'])) {
+        $input_errors[] = sprintf(gettext("%s is not a valid destination IP address or alias."), $pconfig['dst']);
+    }
+
     if (count($input_errors) == 0) {
       $natent = array();