Fix handling of X-Forwarded-For header with multiple addresses (#1489481)

Aleksander Machniak

2013-12-17 a520f331c16fc703cc92d5b9853fb91805f82305

 program/lib/Roundcube/rcube_utils.php

@@ -680,9 +680,17 @@
     */
    public static function remote_addr()
    {
        foreach (array('HTTP_X_FORWARDED_FOR','HTTP_X_REAL_IP','REMOTE_ADDR') as $prop) {
            if (!empty($_SERVER[$prop]))
                return $_SERVER[$prop];
        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $hosts = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'], 2);
            return $hosts[0];
        }

        if (!empty($_SERVER['HTTP_X_REAL_IP'])) {
            return $_SERVER['HTTP_X_REAL_IP'];
        }

        if (!empty($_SERVER['REMOTE_ADDR'])) {
            return $_SERVER['REMOTE_ADDR'];
        }

        return '';