/*

 * 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 4431020

 * @summary On Windows 2000 we observed behaviour that reflects the underlying

 * implementation :-

 *   1. PortUnreachableException throw per underlying reset

 *   2. No PUE throw for DatagramSocket.send

 */

import java.net.*;

public class OneExceptionOnly {

    static void doTest(InetAddress ia, int port, boolean testSend) throws Exception {

        System.out.println("");

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

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

        System.out.println("    - Send 10 datagrams to bad destination");

        System.out.println("    - <wait a wee while>");

        if (testSend) {

            System.out.println("    - Send another datagram - should throw PUE or timeout");

        } else {

            System.out.println("    - Receive another datagram - should throw PUE or timeout");

        }

        System.out.println("    - Receive another receive - a SocketTimeoutException expected");

        System.out.println("");

        /*

         * Create the datagram and connect it to destination

         */

        DatagramSocket s1 = new DatagramSocket();

        s1.connect(ia, port);

        byte b[] = new byte[512];

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

        /*

         * Send a bunch of packets to the destination

         */

        int outstanding = 0;

        for (int i=0; i<20; i++) {

            try {

                s1.send(p);

                outstanding++;

            } catch (PortUnreachableException e) {

                /* PUE throw => assume none outstanding now */

                outstanding = 0;

            }

            if (outstanding > 1) {

                break;

            }

        }

        if (outstanding < 1) {

            System.out.println("Insufficient exceptions outstanding - Test Skipped (Passed).");

            s1.close();

            return;

        }

        /*

         * Give time for ICMP port unreachables to return

         */

        Thread.currentThread().sleep(5000);

        /*

         * The next send or receive should cause a PUE to be thrown

         */

        boolean gotPUE = false;

        boolean gotTimeout = false;

        s1.setSoTimeout(2000);

        try {

            if (testSend) {

                s1.send(p);

            } else {

                s1.receive(p);

            }

        } catch (PortUnreachableException pue) {

            gotPUE = true;

            System.out.println("Expected PortUnreachableException thrown - good!");

        } catch (SocketTimeoutException exc) {

        }

        /*

         * The next receive should timeout

         */

        if (gotPUE) {

            try {

                s1.receive(p);

            } catch (PortUnreachableException pue) {

                throw new Exception("Unexpected PUE received - assumed that PUs would be consumed");

            } catch (SocketTimeoutException exc) {

                System.out.println("Expected SocketTimeoutException thrown - excellent! - Test Passed.");

            }

        } else {

            System.out.println("Expected PUE not thrown - packets probably discarded (Passed).");

        }

        s1.close();

    }

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

        InetAddress ia;

        int port;

        if (args.length >= 2) {

            ia = InetAddress.getByName(args[0]);

            port = Integer.parseInt(args[1]);

        } else {

            ia = InetAddress.getLocalHost();

            DatagramSocket s1 = new DatagramSocket();

            port = s1.getLocalPort();

            s1.close();

        }

        doTest(ia, port, true);

        doTest(ia, port, false);

    }

}