test/java/net/DatagramSocket/PortUnreachable.java

*** 1,7 ****
  /*
!  * Copyright (c) 2000, 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.
--- 1,7 ----
  /*
!  * Copyright (c) 2000, 2013 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.
*** 29,64 ****
   *           exception on Windows 2000.
   */
  import java.net.InetAddress;
  import java.net.DatagramSocket;
  import java.net.DatagramPacket;
- import java.io.InterruptedIOException;
  
! public class PortUnreachable implements Runnable {
  
      DatagramSocket clientSock;
      int serverPort;
      int clientPort;
  
!     public void run() {
          try {
              InetAddress addr = InetAddress.getLocalHost();
! 
!             Thread.currentThread().sleep(2000);
! 
              // 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);
  
-             // wait before bringing the server up
-             Thread.currentThread().sleep(5000);
- 
              DatagramSocket sock = new DatagramSocket(serverPort);
!             b = "Grettings from the server".getBytes();
              packet = new DatagramPacket(b, b.length, addr, clientPort);
              sock.send(packet);
              sock.close();
          } catch (Exception e) {
              e.printStackTrace();
--- 29,58 ----
   *           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();
*** 68,104 ****
      PortUnreachable() throws Exception {
  
          clientSock = new DatagramSocket();
          clientPort = clientSock.getLocalPort();
  
          // pick a port for the server
          DatagramSocket sock2 = new DatagramSocket();
          serverPort = sock2.getLocalPort();
-         sock2.close();
  
          // 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);
          for (int i=0; i<100; i++)
              clientSock.send(packet);
  
!         // start the server thread
!         Thread thr = new Thread(this);
!         thr.start();
! 
          // try to receive
          clientSock.setSoTimeout(10000);
          clientSock.receive(packet);
  
          // done
          clientSock.close();
      }
  
      public static void main(String[] args) throws Exception {
!         new PortUnreachable();
      }
  
  }
--- 62,104 ----
      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();
      }
  
  }