1 /*
   2  * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /**
  25  * @test
  26  * @bug 4361783
  27  * @summary  Test to see if ICMP Port Unreachable on non-connected
  28  *           DatagramSocket causes a SocketException "socket closed"
  29  *           exception on Windows 2000.
  30  */
  31 import java.net.InetAddress;
  32 import java.net.DatagramSocket;
  33 import java.net.DatagramPacket;
  34 import java.util.concurrent.CountDownLatch;
  35 import java.io.InterruptedIOException;
  36 
  37 public class PortUnreachable implements Runnable {
  38 
  39     DatagramSocket clientSock;
  40     int serverPort;
  41     int clientPort;
  42     CountDownLatch clientReadyLatch;
  43 
  44     public void run() {
  45         try {
  46             InetAddress addr = InetAddress.getLocalHost();
  47             Thread.currentThread().sleep(1000);
  48             // send a delayed packet which should mean a delayed icmp
  49             // port unreachable
  50             byte b[] = "A late msg".getBytes();
  51             DatagramPacket packet = new DatagramPacket(b, b.length, addr,
  52                                                        serverPort);
  53             clientSock.send(packet);
  54 
  55             DatagramSocket sock = new DatagramSocket(serverPort);
  56             b = "Grettings from the server".getBytes();
  57             packet = new DatagramPacket(b, b.length, addr, clientPort);
  58             clientReadyLatch.await();
  59             sock.send(packet);
  60             sock.close();
  61         } catch (Exception e) {
  62             e.printStackTrace();
  63         }
  64     }
  65 
  66     PortUnreachable() throws Exception {
  67 
  68         clientSock = new DatagramSocket();
  69         clientPort = clientSock.getLocalPort();
  70         clientReadyLatch = new CountDownLatch(1);
  71 
  72         // pick a port for the server
  73         DatagramSocket sock2 = new DatagramSocket();
  74         serverPort = sock2.getLocalPort();
  75 
  76         // send a burst of packets to the unbound port - we should get back
  77         // icmp port unreachable messages
  78         //
  79         InetAddress addr = InetAddress.getLocalHost();
  80         byte b[] = "Hello me".getBytes();
  81         DatagramPacket packet = new DatagramPacket(b, b.length, addr,
  82                                                    serverPort);
  83         //close just before sending
  84         sock2.close();
  85         for (int i=0; i<100; i++)
  86             clientSock.send(packet);
  87 
  88         // start the server thread
  89         Thread serverSenderThread = new Thread(this);
  90         serverSenderThread.start();
  91 
  92         // try to receive
  93         clientSock.setSoTimeout(10000);
  94         clientReadyLatch.countDown();
  95         clientSock.receive(packet);
  96         System.out.println("client received data packet " + new String(packet.getData()));
  97 
  98         // done
  99         clientSock.close();
 100     }
 101 
 102     public static void main(String[] args) throws Exception {
 103         new PortUnreachable();
 104     }
 105 
 106 }