ntp: disable when no servers are set; closes #332

This will make a few good people very happy.  :)

src/etc/inc/services.inc

@@ -2543,13 +2543,15 @@ function services_get()
         $services[] = $pconfig;
     }
 
-    $pconfig = array();
-    $pconfig['name'] = "ntpd";
-    $pconfig['description'] = gettext("NTP clock sync");
-    $pconfig['php']['restart'] = array('system_ntp_configure');
-    $pconfig['php']['start'] = array('system_ntp_configure');
-    $pconfig['pidfile'] = '/var/run/ntpd.pid';
-    $services[] = $pconfig;
+    if (isset($config['system']['timeservers'])) {
+        $pconfig = array();
+        $pconfig['name'] = "ntpd";
+        $pconfig['description'] = gettext("NTP clock sync");
+        $pconfig['php']['restart'] = array('system_ntp_configure');
+        $pconfig['php']['start'] = array('system_ntp_configure');
+        $pconfig['pidfile'] = '/var/run/ntpd.pid';
+        $services[] = $pconfig;
+    }
 
     $iflist = array();
     $ifdescrs = get_configured_interface_list();

src/etc/inc/system.inc

@@ -1474,6 +1474,17 @@ function system_ntp_configure($start_ntpd = true)
 {
     global $config;
 
+    /* if ntpd is running, kill it when restart is not delayed */
+    while ($start_ntpd && isvalidpid('/var/run/ntpd.pid')) {
+        killbypid('/var/run/ntpd.pid');
+        usleep(200 * 1000);
+    }
+
+    if (!isset($config['system']['timeservers'])) {
+        /* use this field for on/off toggle */
+        return;
+    }
+
     $driftfile = '/var/db/ntpd.drift';
     $statsdir = '/var/log/ntp';
     $gps_device = '/dev/gps0';
@@ -1719,12 +1730,6 @@ function system_ntp_configure($start_ntpd = true)
         return;
     }
 
-    /* if ntpd is running, kill it */
-    while (isvalidpid('/var/run/ntpd.pid')) {
-        killbypid('/var/run/ntpd.pid');
-        usleep(200 * 1000);
-    }
-
     /* if /var/empty does not exist, create it */
     @mkdir('/var/empty', 0775, true);
 

src/www/services_ntpd.php

@@ -63,9 +63,10 @@ if ($_POST) {
 			if (!empty($_POST["servselect{$i}"])) $config['ntpd']['noselect'].= "{$tserver} ";
 		}
 	}
-	if (trim($timeservers) == "")
-		$timeservers = "pool.ntp.org";
 	$config['system']['timeservers'] = trim($timeservers);
+	if (empty($config['system']['timeservers'])) {
+	    unset($config['system']['timeservers']);
+        }
 
 	if (!empty($_POST['ntporphan']) && ($_POST['ntporphan'] < 17) && ($_POST['ntporphan'] != '12'))
 		$config['ntpd']['orphan'] = $_POST['ntporphan'];

src/www/system_general.php

@@ -159,9 +159,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
     # it's easy to have a little too much whitespace in the field, clean it up for the user before processing.
     $pconfig['timeservers'] = preg_replace('/[[:blank:]]+/', ' ', $pconfig['timeservers']);
     $pconfig['timeservers'] = trim($pconfig['timeservers']);
-    foreach (explode(' ', $pconfig['timeservers']) as $ts) {
-        if (!is_domain($ts)) {
-            $input_errors[] = gettext("A NTP Time Server name may only contain the characters a-z, 0-9, '-' and '.'.");
+    if (!empty($pconfig['timeservers'])) {
+        foreach (explode(' ', $pconfig['timeservers']) as $ts) {
+            if (!is_domain($ts)) {
+                $input_errors[] = gettext("A NTP Time Server name may only contain the characters a-z, 0-9, '-' and '.'.");
+            }
         }
     }
 
@@ -170,6 +172,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
       $config['system']['domain'] = $pconfig['domain'];
       $config['system']['timezone'] = $pconfig['timezone'];
       $config['system']['timeservers'] = strtolower($pconfig['timeservers']);
+      if (empty($config['system']['timeservers'])) {
+          unset($config['system']['timeservers']);
+      }
       $config['theme'] =  $pconfig['theme'];
 
       if (!empty($pconfig['language']) && $pconfig['language'] != $config['system']['language']) {
@@ -448,9 +453,9 @@ include("head.inc");
               <td width="78%" class="vtable">
                 <input name="timeservers" type="text" class="formfld unknown" value="<?=$pconfig['timeservers'];?>" />
                 <div class="hidden" for="help_for_ntp">
-                  <?=gettext("Use a space to separate multiple hosts (only one " .
-                  "required). Remember to set up at least one DNS server " .
-                  "if you enter a host name here!"); ?>
+                  <?=gettext("Use a space to separate multiple hosts if " .
+                  "needed or leave blank to disable the network time service. " .
+                  "Remember to set up DNS if you enter host names here."); ?>
                 </div>
               </td>
             </tr>