/*

 * Copyright (c) 2008, 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 6628576

 * @summary InterfaceAddress.equals() NPE when broadcast field == null

 */

import java.net.InterfaceAddress;

import java.net.InetAddress;

import java.net.UnknownHostException;

import java.lang.reflect.Constructor;

import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

public class Equals

{

    public static void main(String[] args) {

        InterfaceAddress ia1;

        InterfaceAddress ia2;

        InetAddress loopbackAddr = InetAddress.getLoopbackAddress();

        InetAddress broadcast1 = null;

        InetAddress broadcast2 = null;

        try {

            broadcast1 = InetAddress.getByName("255.255.255.0");

            broadcast2 = InetAddress.getByName("255.255.0.0");

        } catch (UnknownHostException e) {

            e.printStackTrace();

        }

        ia1 = createInterfaceAddress(loopbackAddr, (InetAddress) null, (short)45);

        ia2 = createInterfaceAddress(loopbackAddr, (InetAddress) null, (short)45);

        compare(ia1, ia2, true);

        ia2 = createInterfaceAddress(loopbackAddr, broadcast1, (short)45);

        compare(ia1, ia2, false);

        ia2 = createInterfaceAddress((InetAddress)null, broadcast1, (short)45);

        compare(ia1, ia2, false);

        ia1 = createInterfaceAddress(loopbackAddr, broadcast2, (short)45);

        ia2 = createInterfaceAddress(loopbackAddr, broadcast2, (short)45);

        compare(ia1, ia2, true);

        ia1.equals(null);

    }

    static void compare(InterfaceAddress ia1, InterfaceAddress ia2, boolean equal) {

        if (ia1.equals(ia2) != equal)

            throw new RuntimeException("Failed: " + ia1 + " not equals to " + ia2);

        if (ia2.equals(ia1) != equal)

            throw new RuntimeException("Failed: " + ia2 + " not equals to " + ia1);

    }

    /**

     * Returns an InterfaceAddress instance with its fields set the the values

     * specificed.

     */

    static InterfaceAddress createInterfaceAddress(

                InetAddress address, InetAddress broadcast, short prefixlength) {

        try {

            Class<InterfaceAddress> IAClass = InterfaceAddress.class;

            InterfaceAddress ia;

            Constructor<InterfaceAddress> ctr = IAClass.getDeclaredConstructor();

            ctr.setAccessible(true);

            Field addressField = IAClass.getDeclaredField("address");

            addressField.setAccessible(true);

            Field broadcastField = IAClass.getDeclaredField("broadcast");

            broadcastField.setAccessible(true);

            Field maskLengthField = IAClass.getDeclaredField("maskLength");

            maskLengthField.setAccessible(true);

            ia = ctr.newInstance();

            addressField.set(ia, address);

            broadcastField.set(ia, broadcast);

            maskLengthField.setShort(ia, prefixlength);

            return ia;

        } catch (NoSuchFieldException nsfe) {

            nsfe.printStackTrace();

        } catch (NoSuchMethodException e) {

            e.printStackTrace();

        } catch (InstantiationException ie) {

            ie.printStackTrace();

        } catch (IllegalAccessException iae) {

            iae.printStackTrace();

        } catch (InvocationTargetException ite) {

            ite.printStackTrace();

        }

        return null;

    }

}