Change default port to 4190 (IANA-allocated), add port auto-detection (#1488713)

plugins/managesieve/Changelog

@@ -1,5 +1,6 @@
 - Fixed issue with DBMail bug [http://pear.php.net/bugs/bug.php?id=19077] (#1488594)
 - Added support for enotify/notify (RFC5435, RFC5436, draft-ietf-sieve-notify-00)
+- Change default port to 4190 (IANA-allocated), add port auto-detection (#1488713)
 
 * version 5.2 [2012-07-24]
 -----------------------------------------------------------

plugins/managesieve/config.inc.php.dist

@@ -1,7 +1,8 @@
 <?php
 
-// managesieve server port
-$rcmail_config['managesieve_port'] = 2000;
+// managesieve server port. When empty the port will be determined automatically
+// using getservbyname() function, with 4190 as a fallback.
+$rcmail_config['managesieve_port'] = null;
 
 // managesieve server address, default is localhost.
 // Replacement variables supported in host name:

plugins/managesieve/managesieve.php

@@ -7,13 +7,13 @@
  * It's clickable interface which operates on text scripts and communicates
  * with server using managesieve protocol. Adds Filters tab in Settings.
  *
- * @version 5.0
+ * @version @package_version@
  * @author Aleksander Machniak <alec@alec.pl>
  *
  * Configuration (see config.inc.php.dist)
  *
- * Copyright (C) 2008-2011, The Roundcube Dev Team
- * Copyright (C) 2011, Kolab Systems AG
+ * Copyright (C) 2008-2012, The Roundcube Dev Team
+ * Copyright (C) 2011-2012, Kolab Systems AG
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2
@@ -62,8 +62,9 @@ class managesieve extends rcube_plugin
         "x-beenthere",
     );
 
-    const VERSION = '5.2';
+    const VERSION  = '5.2';
     const PROGNAME = 'Roundcube (Managesieve)';
+    const PORT     = 4190;
 
 
     function init()
@@ -200,10 +201,16 @@ class managesieve extends rcube_plugin
         set_include_path($include_path);
 
         $host = rcube_parse_host($this->rc->config->get('managesieve_host', 'localhost'));
-        $port = $this->rc->config->get('managesieve_port', 2000);
-
         $host = rcube_idn_to_ascii($host);
 
+        $port = $this->rc->config->get('managesieve_port');
+        if (empty($port)) {
+            $port = getservbyname('sieve', 'tcp');
+            if (empty($port)) {
+                $port = self::PORT;
+            }
+        }
+
         $plugin = $this->rc->plugins->exec_hook('managesieve_connect', array(
             'user'      => $_SESSION['username'],
             'password'  => $this->rc->decrypt($_SESSION['password']),