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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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    9    * Redistribution and use in source and binary forms, with or without
    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   *
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    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,
    26   *    if and wherever such third-party acknowledgments normally appear.
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    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import java.io.IOException;
    58  import org.apache.commons.net.bsd.RLoginClient;
    59
    60  /****
    61   * This is an example program demonstrating how to use the RLoginClient
    62   * class. This program connects to an rlogin daemon and begins to
    63   * interactively read input from stdin (this will be line buffered on most
    64   * systems, so don't expect character at a time interactivity), passing it
    65   * to the remote login process and writing the remote stdout and stderr
    66   * to local stdout.  If you don't have .rhosts or hosts.equiv files set up,
    67   * the rlogin daemon will prompt you for a password.
    68   * <p>
    69   * On Unix systems you will not be able to use the rshell capability
    70   * unless the process runs as root since only root can bind port addresses
    71   * lower than 1024.
    72   * <p>
    73   * JVM's using green threads will likely have problems if the rlogin daemon
    74   * requests a password.  This program is merely a demonstration and is
    75   * not suitable for use as an application, especially given that it relies
    76   * on line buffered input from System.in.  The best way to run this example
    77   * is probably from a Win95 dos box into a Unix host.
    78   * <p>
    79   * Example: java rlogin myhost localusername remoteusername vt100
    80   * <p>
    81   * Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
    82   * <p>
    83   ***/
    84
    85  // This class requires the IOUtil support class!
    86  public final class rlogin
    87  {
    88
    89      public static final void main(String[] args)
    90      {
    91          String server, localuser, remoteuser, terminal;
    92          RLoginClient client;
    93
    94          if (args.length != 4)
    95          {
    96              System.err.println(
    97                  "Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>");
    98              System.exit(1);
    99              return ; // so compiler can do proper flow control analysis
    100         }
    101
    102         client = new RLoginClient();
    103
    104         server = args[0];
    105         localuser = args[1];
    106         remoteuser = args[2];
    107         terminal = args[3];
    108
    109         try
    110         {
    111             client.connect(server);
    112         }
    113         catch (IOException e)
    114         {
    115             System.err.println("Could not connect to server.");
    116             e.printStackTrace();
    117             System.exit(1);
    118         }
    119
    120         try
    121         {
    122             client.rlogin(localuser, remoteuser, terminal);
    123         }
    124         catch (IOException e)
    125         {
    126             try
    127             {
    128                 client.disconnect();
    129             }
    130             catch (IOException f)
    131             {}
    132             e.printStackTrace();
    133             System.err.println("rlogin authentication failed.");
    134             System.exit(1);
    135         }
    136
    137
    138         IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
    139                          System.in, System.out);
    140
    141         try
    142         {
    143             client.disconnect();
    144         }
    145         catch (IOException e)
    146         {
    147             e.printStackTrace();
    148             System.exit(1);
    149         }
    150
    151         System.exit(0);
    152     }
    153
    154 }
    155

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