I also read this link
http://trac.roundcube.net/wiki/Plugin_Hooks but in vain.
I do not understand if I need to download something, add it into plugins directory...
or nothing exist at all and I need to write my own plugin ?
because there are some lines about login_after within index.php file of roundcube on line 143 :
<?php
/*
+-------------------------------------------------------------------------+
| Roundcube Webmail IMAP Client |
| Version 0.9.5 |
| |
| Copyright (C) 2005-2013, The Roundcube Dev Team |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License (with exceptions |
| for skins & plugins) as published by the Free Software Foundation, |
| either version 3 of the License, or (at your option) any later version. |
| |
| This file forms part of the Roundcube Webmail Software for which the |
| following exception is added: Plugins and Skins which merely make |
| function calls to the Roundcube Webmail Software, and for that purpose |
| include it by reference shall not be considered modifications of |
| the software. |
| |
| If you wish to use this file in another project or create a modified |
| version that will not be part of the Roundcube Webmail Software, you |
| may remove the exception above and use this source code under the |
| original version of the license. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see
http://www.gnu.org/licenses/. |
| |
+-------------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-------------------------------------------------------------------------+
*/
......
142 // allow plugins to control the redirect url after login success
143 $redir = $RCMAIL->plugins->exec_hook('login_after', $query + array('_task' => 'mail'));
144 unset($redir['abort'], $redir['_err']);
