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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