/*

 * Copyright (c) 2006, 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 6376404 8201545

 * @summary InetAddress needs a getLoopbackAddress

 */

import java.net.*;

public class GetLoopbackAddress

{

    static InetAddress IPv4Loopback;

    static InetAddress IPv6Loopback;

    static {

        try {

            IPv4Loopback = InetAddress.getByAddress(

                new byte[] {0x7F,0x00,0x00,0x01});

            IPv6Loopback = InetAddress.getByAddress(

                new byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01});

        } catch (UnknownHostException e) {

        }

    }

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

        InetAddress addr = InetAddress.getLoopbackAddress();

        if (!(addr.equals(IPv4Loopback) || addr.equals(IPv6Loopback))) {

            throw new RuntimeException("Failed: getLoopbackAddress" +

                 " not returning a valid loopback address");

        }

        InetAddress addr2 = InetAddress.getLoopbackAddress();

        if (addr != addr2) {

            throw new RuntimeException("Failed: getLoopbackAddress" +

                " should return a reference to the same InetAddress loopback instance.");

        }

        InetAddress addrFromNullHost = InetAddress.getByName(null);

        if (!addrFromNullHost.isLoopbackAddress()) {

            throw new RuntimeException("getByName(null) did not return a" +

            " loopback address, but " + addrFromNullHost);

        }

        InetAddress addrFromEmptyHost = InetAddress.getByName("");

        if (!addrFromEmptyHost.isLoopbackAddress()) {

            throw new RuntimeException("getByName with a host of length == 0," +

                " did not return a loopback address, but " + addrFromEmptyHost);

        }

        InetAddress[] addrsByNull = InetAddress.getAllByName(null);

        if (!addrsByNull[0].isLoopbackAddress()) {

            throw new RuntimeException("getAllByName(null) did not return" +

            " a loopback address, but " + addrsByNull[0]);

        }

        InetAddress[] addrsByEmpty = InetAddress.getAllByName("");

        if (!addrsByEmpty[0].isLoopbackAddress()) {

            throw new RuntimeException("getAllByName with a host of length" +

            " == 0, did not return a loopback address, but " + addrsByEmpty[0]);

        }

    }

}