PortUnreachable.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @bug 4361783
 * @key intermittent
 * @summary  Test to see if ICMP Port Unreachable on non-connected
 *           DatagramSocket causes a SocketException "socket closed"
 *           exception on Windows 2000.
 */
import java.net.InetAddress;
import java.net.DatagramSocket;
import java.net.DatagramPacket;

public class PortUnreachable {

    DatagramSocket clientSock;
    int serverPort;
    int clientPort;

    public void serverSend() {
        try {
            InetAddress addr = InetAddress.getLocalHost();
            Thread.currentThread().sleep(1000);
            // send a delayed packet which should mean a delayed icmp
            // port unreachable
            byte b[] = "A late msg".getBytes();
            DatagramPacket packet = new DatagramPacket(b, b.length, addr,
                                                       serverPort);
            clientSock.send(packet);

            DatagramSocket sock = new DatagramSocket(serverPort);
            b = "Greetings from the server".getBytes();
            packet = new DatagramPacket(b, b.length, addr, clientPort);
            sock.send(packet);
            sock.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    PortUnreachable() throws Exception {

        clientSock = new DatagramSocket();
        clientPort = clientSock.getLocalPort();

    }

    void execute () throws Exception{

        // pick a port for the server
        DatagramSocket sock2 = new DatagramSocket();
        serverPort = sock2.getLocalPort();

        // send a burst of packets to the unbound port - we should get back
        // icmp port unreachable messages
        //
        InetAddress addr = InetAddress.getLocalHost();
        byte b[] = "Hello me".getBytes();
        DatagramPacket packet = new DatagramPacket(b, b.length, addr,
                                                   serverPort);
        //close just before sending
        sock2.close();
        for (int i=0; i<100; i++)
            clientSock.send(packet);

        serverSend();
        // try to receive
        b = new byte[25];
        packet = new DatagramPacket(b, b.length, addr, serverPort);
        clientSock.setSoTimeout(10000);
        clientSock.receive(packet);
        System.out.println("client received data packet " + new String(packet.getData()));

        // done
        clientSock.close();
    }

    public static void main(String[] args) throws Exception {
        PortUnreachable test = new PortUnreachable();
        test.execute();
    }

}