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    1   package examples;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
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    10   * modification, are permitted provided that the following conditions
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    12   *
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    14   *    notice, this list of conditions and the following disclaimer.
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    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
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    25   *    Alternately, this acknowledgment may appear in the software itself,
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    56
    57  import java.io.BufferedReader;
    58  import java.io.IOException;
    59  import java.io.InputStreamReader;
    60  import java.io.InterruptedIOException;
    61  import java.net.InetAddress;
    62  import java.net.SocketException;
    63  import org.apache.commons.net.CharGenTCPClient;
    64  import org.apache.commons.net.CharGenUDPClient;
    65
    66  /****
    67   * This is an example program demonstrating how to use the CharGenTCPClient
    68   * and CharGenUDPClient classes.  This program connects to the default
    69   * chargen service port of a specified server, then reads 100 lines from
    70   * of generated output, writing each line to standard output, and then
    71   * closes the connection.  The UDP invocation of the program sends 50
    72   * datagrams, printing the reply to each.
    73   * The default is to use the TCP port.  Use the -udp flag to use the UDP
    74   * port.
    75   * <p>
    76   * Usage: chargen [-udp] <hostname>
    77   * <p>
    78   ***/
    79  public final class chargen
    80  {
    81
    82      public static final void chargenTCP(String host) throws IOException
    83      {
    84          int lines = 100;
    85          String line;
    86          CharGenTCPClient client = new CharGenTCPClient();
    87          BufferedReader chargenInput;
    88
    89          // We want to timeout if a response takes longer than 60 seconds
    90          client.setDefaultTimeout(60000);
    91          client.connect(host);
    92          chargenInput =
    93              new BufferedReader(new InputStreamReader(client.getInputStream()));
    94
    95          // We assume the chargen service outputs lines, but it really doesn't
    96          // have to, so this code might actually not work if no newlines are
    97          // present.
    98          while (lines-- > 0)
    99          {
    100             if ((line = chargenInput.readLine()) == null)
    101                 break;
    102             System.out.println(line);
    103         }
    104
    105         client.disconnect();
    106     }
    107
    108     public static final void chargenUDP(String host) throws IOException
    109     {
    110         int packets = 50;
    111         byte[] data;
    112         InetAddress address;
    113         CharGenUDPClient client;
    114
    115         address = InetAddress.getByName(host);
    116         client = new CharGenUDPClient();
    117
    118         client.open();
    119         // If we don't receive a return packet within 5 seconds, assume
    120         // the packet is lost.
    121         client.setSoTimeout(5000);
    122
    123         while (packets-- > 0)
    124         {
    125             client.send(address);
    126
    127             try
    128             {
    129                 data = client.receive();
    130             }
    131             // Here we catch both SocketException and InterruptedIOException,
    132             // because even though the JDK 1.1 docs claim that
    133             // InterruptedIOException is thrown on a timeout, it seems
    134             // SocketException is also thrown.
    135             catch (SocketException e)
    136             {
    137                 // We timed out and assume the packet is lost.
    138                 System.err.println("SocketException: Timed out and dropped packet");
    139                 continue;
    140             }
    141             catch (InterruptedIOException e)
    142             {
    143                 // We timed out and assume the packet is lost.
    144                 System.err.println(
    145                     "InterruptedIOException: Timed out and dropped packet");
    146                 continue;
    147             }
    148             System.out.write(data);
    149             System.out.flush();
    150         }
    151
    152         client.close();
    153     }
    154
    155
    156     public static final void main(String[] args)
    157     {
    158
    159         if (args.length == 1)
    160         {
    161             try
    162             {
    163                 chargenTCP(args[0]);
    164             }
    165             catch (IOException e)
    166             {
    167                 e.printStackTrace();
    168                 System.exit(1);
    169             }
    170         }
    171         else if (args.length == 2 && args[0].equals("-udp"))
    172         {
    173             try
    174             {
    175                 chargenUDP(args[1]);
    176             }
    177             catch (IOException e)
    178             {
    179                 e.printStackTrace();
    180                 System.exit(1);
    181             }
    182         }
    183         else
    184         {
    185             System.err.println("Usage: chargen [-udp] <hostname>");
    186             System.exit(1);
    187         }
    188
    189     }
    190
    191 }
    192

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