unbound: add serve-expired option #1405

(cherry picked from commit cdaa7aff)
(cherry picked from commit 069019c8)

src/etc/inc/plugins.inc.d/unbound.inc

@@ -280,7 +280,8 @@ EOF;
     $verbosity = isset($config['unbound']['log_verbosity']) ? $config['unbound']['log_verbosity'] : 1;
     $msgcachesize = !empty($config['unbound']['msgcachesize']) ? $config['unbound']['msgcachesize'] : 4;
     $rrsetcachesize = $msgcachesize * 2;
-    $dnssecstripped = !empty($config['unbound']['dnssecstripped']) ? "yes" : "no";
+    $dnssecstripped = !empty($config['unbound']['dnssecstripped']) ? 'yes' : 'no';
+    $serveexpired = !empty($config['unbound']['serveexpired']) ? 'yes' : 'no';
 
     if (isset($config['unbound']['regdhcp'])) {
         // include dynamic leases
@@ -352,6 +353,7 @@ module-config: "{$module_config}"
 cache-max-ttl: {$cache_max_ttl}
 cache-min-ttl: {$cache_min_ttl}
 harden-dnssec-stripped: {$dnssecstripped}
+serve-expired: {$serveexpired}
 outgoing-num-tcp: {$outgoing_num_tcp}
 incoming-num-tcp: {$incoming_num_tcp}
 num-queries-per-thread: {$num_queries_per_thread}

src/www/services_unbound_advanced.php

@@ -66,6 +66,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
     $pconfig['prefetch'] = isset($config['unbound']['prefetch']);
     $pconfig['prefetchkey'] = isset($config['unbound']['prefetchkey']);
     $pconfig['dnssecstripped'] = isset($config['unbound']['dnssecstripped']);
+    $pconfig['serveexpired'] = isset($config['unbound']['serveexpired']);
 
     // text fields
     foreach ($copy_fields as $fieldname) {
@@ -85,11 +86,12 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
     } else {
         $pconfig = $_POST;
         // boolean fields
-        $config['unbound']['hideidentity'] =  !empty($pconfig['hideidentity']);
-        $config['unbound']['hideversion'] =  !empty($pconfig['hideversion']);
-        $config['unbound']['prefetch'] =  !empty($pconfig['prefetch']);
-        $config['unbound']['prefetchkey'] =  !empty($pconfig['prefetchkey']);
-        $config['unbound']['dnssecstripped'] =  !empty($pconfig['dnssecstripped']);
+        $config['unbound']['hideidentity'] = !empty($pconfig['hideidentity']);
+        $config['unbound']['hideversion'] = !empty($pconfig['hideversion']);
+        $config['unbound']['prefetch'] = !empty($pconfig['prefetch']);
+        $config['unbound']['prefetchkey'] = !empty($pconfig['prefetchkey']);
+        $config['unbound']['dnssecstripped'] = !empty($pconfig['dnssecstripped']);
+        $config['unbound']['serveexpired'] = !empty($pconfig['serveexpired']);
         // text fields
         foreach ($copy_fields as $fieldname) {
             $config['unbound'][$fieldname] = $pconfig[$fieldname];
@@ -175,6 +177,15 @@ include_once("head.inc");
                           </div>
                         </td>
                       </tr>
+                      <tr>
+                        <td><a id="help_for_serveexpired" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?= gettext('Serve expired responses') ?></td>
+                        <td>
+                          <input name="serveexpired" type="checkbox" id="serveexpired" value="yes" <?= empty($pconfig['serveexpired']) ? '' : 'checked="checked"' ?> />
+                          <div class="hidden" for="help_for_serveexpired">
+                            <?= gettext('Serve expired responses from the cache with a TTL of 0 without waiting for the actual resolution to finish.') ?>
+                          </div>
+                        </td>
+                      </tr>
                       <tr>
                         <td><a id="help_for_msgcachesize" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?= gettext("Message Cache Size") ?></td>
                         <td>