/*

 * Copyright (c) 2001, 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 4413768

 * @summary Checking that PortUnreachableException is thrown when

 *          ICMP Port Unreachable is received.

 */

import java.net.*;

import java.util.Properties;

public class Test {

    /*

     * Return an available port

     */

    int getPort() throws Exception {

        DatagramSocket s = new DatagramSocket(0);

        int port = s.getLocalPort();

        s.close();

        return port;

    }

    /*

     * Perform test by sending to remote_host:port

     * sendOnly => send datagram to host and expect PUE on subsequent

     *             send

     * !sendOnly => send datagram to host and expect PUE on subsequent

     *              send or receive.

     */

    void doTest(String remote_host, int port, boolean sendOnly) throws Exception {

        System.out.println("***");

        System.out.println("Test Description:");

        System.out.println("    DatagramSocket.connect");

        System.out.println("    Loop: DatagramSocket.send");

        if (!sendOnly) {

            System.out.println("          DatagramSocket.receive");

        }

        System.out.println("");

        System.out.println("Test Run:");

        InetAddress ia = InetAddress.getByName(remote_host);

        DatagramSocket s = new DatagramSocket(0);

        s.setSoTimeout(1000);

        s.connect(ia, port);

        byte[] b = "Hello".getBytes();

        DatagramPacket p1 = new DatagramPacket(b, b.length, ia, port);

        DatagramPacket p2 = new DatagramPacket(b, b.length);

        int i = 0;

        boolean gotPUE = false;

        do {

            System.out.println("Sending datagram to unreachable port...");

            try {

                s.send(p1);

            } catch (PortUnreachableException e) {

                System.out.println("DatagramSocket.send threw PUE");

                gotPUE = true;

            }

            if (!gotPUE) {

                Thread.currentThread().sleep(1000);

            }

            if (!sendOnly && !gotPUE) {

                System.out.println("DatagramSocket.receive...");

                try {

                    s.receive(p2);

                } catch (PortUnreachableException e) {

                    System.out.println("DatagramSocket.receive threw PUE");

                    gotPUE = true;

                } catch (SocketTimeoutException e) {

                    System.out.println("DatagramSocket.receive timed out - no PUE");

                }

            }

            i++;

        } while (i < 10 && !gotPUE);

        if (!gotPUE) {

            System.out.println("DatagramSocket.{send,receive} didn't throw " +

                "PortUnreachableException - passing anyway!");

        } else {

            System.out.println("    Test passed.");

        }

        System.out.println("");

    }

    /*

     * Perform tests via remote_host.

     */

    Test(String remote_host) throws Exception {

        int port = getPort();

        doTest(remote_host, port, true);

        doTest(remote_host, port, false);

    }

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

        String remote_host = "localhost";

        if (args.length > 0) {

            remote_host = args[0];

        }

        new Test(remote_host);

    }

}