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Java > Open Source Codes > examples > rlogin


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 JavaDoc;
19 import org.apache.commons.net.bsd.RLoginClient;
20
21 /***
22  * This is an example program demonstrating how to use the RLoginClient
23  * class. This program connects to an rlogin daemon and begins to
24  * interactively read input from stdin (this will be line buffered on most
25  * systems, so don't expect character at a time interactivity), passing it
26  * to the remote login process and writing the remote stdout and stderr
27  * to local stdout. If you don't have .rhosts or hosts.equiv files set up,
28  * the rlogin daemon will prompt you for a password.
29  * <p>
30  * On Unix systems you will not be able to use the rshell capability
31  * unless the process runs as root since only root can bind port addresses
32  * lower than 1024.
33  * <p>
34  * JVM's using green threads will likely have problems if the rlogin daemon
35  * requests a password. This program is merely a demonstration and is
36  * not suitable for use as an application, especially given that it relies
37  * on line buffered input from System.in. The best way to run this example
38  * is probably from a Win95 dos box into a Unix host.
39  * <p>
40  * Example: java rlogin myhost localusername remoteusername vt100
41  * <p>
42  * Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
43  * <p>
44  ***/
45
46 // This class requires the IOUtil support class!
47 public final class rlogin
48 {
49
50     public static final void main(String JavaDoc[] args)
51     {
52         String JavaDoc server, localuser, remoteuser, terminal;
53         RLoginClient client;
54
55         if (args.length != 4)
56         {
57             System.err.println(
58                 "Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>");
59             System.exit(1);
60             return ; // so compiler can do proper flow control analysis
61 }
62
63         client = new RLoginClient();
64
65         server = args[0];
66         localuser = args[1];
67         remoteuser = args[2];
68         terminal = args[3];
69
70         try
71         {
72             client.connect(server);
73         }
74         catch (IOException JavaDoc e)
75         {
76             System.err.println("Could not connect to server.");
77             e.printStackTrace();
78             System.exit(1);
79         }
80
81         try
82         {
83             client.rlogin(localuser, remoteuser, terminal);
84         }
85         catch (IOException JavaDoc e)
86         {
87             try
88             {
89                 client.disconnect();
90             }
91             catch (IOException JavaDoc f)
92             {}
93             e.printStackTrace();
94             System.err.println("rlogin authentication failed.");
95             System.exit(1);
96         }
97
98
99         IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
100                          System.in, System.out);
101
102         try
103         {
104             client.disconnect();
105         }
106         catch (IOException JavaDoc e)
107         {
108             e.printStackTrace();
109             System.exit(1);
110         }
111
112         System.exit(0);
113     }
114
115 }
116
117
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