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    1   /*
    2    * Copyright 2001-2005 The Apache Software Foundation
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package examples;
    17
    18  import java.io.IOException;
    19  import org.apache.commons.net.bsd.RExecClient;
    20
    21  /****
    22   * This is an example program demonstrating how to use the RExecClient class.
    23   * This program connects to an rexec server and requests that the
    24   * given command be executed on the server.  It then reads input from stdin
    25   * (this will be line buffered on most systems, so don't expect character
    26   * at a time interactivity), passing it to the remote process and writes
    27   * the process stdout and stderr to local stdout.
    28   * <p>
    29   * Example: java rexec myhost myusername mypassword "ps -aux"
    30   * <p>
    31   * Usage: rexec <hostname> <username> <password> <command>
    32   * <p>
    33   ***/
    34
    35  // This class requires the IOUtil support class!
    36  public final class rexec
    37  {
    38
    39      public static final void main(String[] args)
    40      {
    41          String server, username, password, command;
    42          RExecClient client;
    43
    44          if (args.length != 4)
    45          {
    46              System.err.println(
    47                  "Usage: rexec <hostname> <username> <password> <command>");
    48              System.exit(1);
    49              return ; // so compiler can do proper flow control analysis
    50          }
    51
    52          client = new RExecClient();
    53
    54          server = args[0];
    55          username = args[1];
    56          password = args[2];
    57          command = args[3];
    58
    59          try
    60          {
    61              client.connect(server);
    62          }
    63          catch (IOException e)
    64          {
    65              System.err.println("Could not connect to server.");
    66              e.printStackTrace();
    67              System.exit(1);
    68          }
    69
    70          try
    71          {
    72              client.rexec(username, password, command);
    73          }
    74          catch (IOException e)
    75          {
    76              try
    77              {
    78                  client.disconnect();
    79              }
    80              catch (IOException f)
    81              {}
    82              e.printStackTrace();
    83              System.err.println("Could not execute command.");
    84              System.exit(1);
    85          }
    86
    87
    88          IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
    89                           System.in, System.out);
    90
    91          try
    92          {
    93              client.disconnect();
    94          }
    95          catch (IOException e)
    96          {
    97              e.printStackTrace();
    98              System.exit(1);
    99          }
    100
    101         System.exit(0);
    102     }
    103
    104 }
    105