Java Network Interface Get getFreeTunnelInterface()

Description

Return the first free tunnel interface.

License

Open Source License

Return

Interface name.

Declaration

public static String getFreeTunnelInterface() 

Method Source Code

//package com.java2s;
/*// w  w w  .ja v a  2s.  c  om
 * ISABEL: A group collaboration tool for the Internet
 * Copyright (C) 2009 Agora System S.A.
 * 
 * This file is part of Isabel.
 * 
 * Isabel is free software: you can redistribute it and/or modify
 * it under the terms of the Affero GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Isabel 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
 * Affero GNU General Public License for more details.
 * 
 * You should have received a copy of the Affero GNU General Public License
 * along with Isabel.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.net.NetworkInterface;

import java.util.Enumeration;

public class Main {
    /**
     * Return the first free tunnel interface.
     * 
     * @return Interface name.
     */

    public static String getFreeTunnelInterface() {
        try {
            Boolean free = false;
            int i;
            for (i = 0;; i++) {
                NetworkInterface interfaz;
                free = true;
                for (Enumeration interfaces = NetworkInterface
                        .getNetworkInterfaces(); interfaces
                        .hasMoreElements();) {
                    interfaz = (NetworkInterface) interfaces.nextElement();
                    if (interfaz.getName().equals("tun" + i)) {
                        free = false;
                    }
                }
                if (free) {
                    return "tun" + i;
                }
            }

        } catch (Exception e) {
            System.out
                    .println("TunnelUtils - Error getting next free tun interface.");
            return null;
        }
    }
}

Related

1. getBroadcast()
2. getCustomMACFormat(NetworkInterface inte)
3. getDefaultInterface()
4. getDefaultNetworkInterface()
5. getFirstMACAdress()
6. getGlobalI()
7. getGlobalInterfaces()
8. getGoodNetworkInterfaces()
9. getHostnameFromNetworkInterface()