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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.RCommandClient;
20
21		/***
22		* This is an example program demonstrating how to use the RCommandClient
23		* class. This program connects to an rshell daemon 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		* On Unix systems you will not be able to use the rshell capability
30		* unless the process runs as root since only root can bind port addresses
31		* lower than 1024.
32		* <p>
33		* Example: java rshell myhost localusername remoteusername "ps -aux"
34		* <p>
35		* Usage: rshell <hostname> <localuser> <remoteuser> <command>
36		* <p>
37		***/
38
39		// This class requires the IOUtil support class!
40	0	public final class rshell
41		{
42
43		public static final void main(String[] args)
44		{
45		String server, localuser, remoteuser, command;
46		RCommandClient client;
47
48	0	if (args.length != 4)
49		{
50	0	System.err.println(
51		"Usage: rshell <hostname> <localuser> <remoteuser> <command>");
52	0	System.exit(1);
53	0	return ; // so compiler can do proper flow control analysis
54		}
55
56	0	client = new RCommandClient();
57
58	0	server = args[0];
59	0	localuser = args[1];
60	0	remoteuser = args[2];
61	0	command = args[3];
62
63		try
64		{
65	0	client.connect(server);
66		}
67	0	catch (IOException e)
68		{
69	0	System.err.println("Could not connect to server.");
70	0	e.printStackTrace();
71	0	System.exit(1);
72	0	}
73
74		try
75		{
76	0	client.rcommand(localuser, remoteuser, command);
77		}
78	0	catch (IOException e)
79		{
80		try
81		{
82	0	client.disconnect();
83		}
84	0	catch (IOException f)
85	0	{}
86	0	e.printStackTrace();
87	0	System.err.println("Could not execute command.");
88	0	System.exit(1);
89	0	}
90
91
92	0	IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
93		System.in, System.out);
94
95		try
96		{
97	0	client.disconnect();
98		}
99	0	catch (IOException e)
100		{
101	0	e.printStackTrace();
102	0	System.exit(1);
103	0	}
104
105	0	System.exit(0);
106	0	}
107
108		}
109

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