1 package examples;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
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
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Commons" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
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54 * <http://www.apache.org/>.
55 */
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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