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    1   package examples;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
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    19   *    distribution.
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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,
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    54   * <http://www.apache.org/>;.
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    56
    57  import java.io.IOException;
    58  import org.apache.commons.net.bsd.RCommandClient;
    59
    60  /****
    61   * This is an example program demonstrating how to use the RCommandClient
    62   * class. This program connects to an rshell daemon and requests that the
    63   * given command be executed on the server.  It then reads input from stdin
    64   * (this will be line buffered on most systems, so don't expect character
    65   * at a time interactivity), passing it to the remote process and writes
    66   * the process stdout and stderr to local stdout.
    67   * <p>
    68   * On Unix systems you will not be able to use the rshell capability
    69   * unless the process runs as root since only root can bind port addresses
    70   * lower than 1024.
    71   * <p>
    72   * Example: java rshell myhost localusername remoteusername "ps -aux"
    73   * <p>
    74   * Usage: rshell <hostname> <localuser> <remoteuser> <command>
    75   * <p>
    76   ***/
    77
    78  // This class requires the IOUtil support class!
    79  public final class rshell
    80  {
    81
    82      public static final void main(String[] args)
    83      {
    84          String server, localuser, remoteuser, command;
    85          RCommandClient client;
    86
    87          if (args.length != 4)
    88          {
    89              System.err.println(
    90                  "Usage: rshell <hostname> <localuser> <remoteuser> <command>");
    91              System.exit(1);
    92              return ; // so compiler can do proper flow control analysis
    93          }
    94
    95          client = new RCommandClient();
    96
    97          server = args[0];
    98          localuser = args[1];
    99          remoteuser = args[2];
    100         command = args[3];
    101
    102         try
    103         {
    104             client.connect(server);
    105         }
    106         catch (IOException e)
    107         {
    108             System.err.println("Could not connect to server.");
    109             e.printStackTrace();
    110             System.exit(1);
    111         }
    112
    113         try
    114         {
    115             client.rcommand(localuser, remoteuser, command);
    116         }
    117         catch (IOException e)
    118         {
    119             try
    120             {
    121                 client.disconnect();
    122             }
    123             catch (IOException f)
    124             {}
    125             e.printStackTrace();
    126             System.err.println("Could not execute command.");
    127             System.exit(1);
    128         }
    129
    130
    131         IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
    132                          System.in, System.out);
    133
    134         try
    135         {
    136             client.disconnect();
    137         }
    138         catch (IOException e)
    139         {
    140             e.printStackTrace();
    141             System.exit(1);
    142         }
    143
    144         System.exit(0);
    145     }
    146
    147 }
    148

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