/*

 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

 * @bug 6707289

 * @summary InterfaceAddress.getNetworkPrefixLength() does not conform to Javadoc

 */

import java.net.InetAddress;

import java.net.Inet4Address;

import java.net.InterfaceAddress;

import java.net.NetworkInterface;

import java.util.Enumeration;

import static java.lang.System.out;

public class NetworkPrefixLength {

    static boolean passed = true;

    public static void main(String[] args) throws Exception {

        Enumeration<NetworkInterface> nics = NetworkInterface.getNetworkInterfaces();

        while (nics.hasMoreElements()) {

            NetworkInterface nic = nics.nextElement();

            for (InterfaceAddress iaddr : nic.getInterfaceAddresses()) {

                boolean valid = checkPrefix(iaddr);

                if (!valid) {

                    passed = false;

                    debug(nic.getName(), iaddr);

                }

            }

        }

        if (!passed)

            throw new RuntimeException("Failed: some interfaces have invalid prefix lengths");

    }

    static boolean checkPrefix(InterfaceAddress iaddr) {

        InetAddress addr = iaddr.getAddress();

        if (addr instanceof Inet4Address)

            return checkIPv4PrefixLength(iaddr.getNetworkPrefixLength());

        else

            return checkIPv6PrefixLength(iaddr.getNetworkPrefixLength());

    }

    static boolean checkIPv4PrefixLength(int prefix) {

        if (prefix >=0 && prefix <= 32)

            return true;

        return false;

    }

    static boolean checkIPv6PrefixLength(int prefix) {

        if (prefix >=0 && prefix <= 128)

            return true;

        return false;

    }

    static void debug(String nicName, InterfaceAddress iaddr) {

        out.println("NIC " + nicName + " has an address with an invalid prefix length:\n" + iaddr);

    }

}