1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package examples;
19
20 import java.io.IOException;
21 import org.apache.commons.net.bsd.RLoginClient;
22
23 /***
24 * This is an example program demonstrating how to use the RLoginClient
25 * class. This program connects to an rlogin daemon and begins to
26 * interactively read input from stdin (this will be line buffered on most
27 * systems, so don't expect character at a time interactivity), passing it
28 * to the remote login process and writing the remote stdout and stderr
29 * to local stdout. If you don't have .rhosts or hosts.equiv files set up,
30 * the rlogin daemon will prompt you for a password.
31 * <p>
32 * On Unix systems you will not be able to use the rshell capability
33 * unless the process runs as root since only root can bind port addresses
34 * lower than 1024.
35 * <p>
36 * JVM's using green threads will likely have problems if the rlogin daemon
37 * requests a password. This program is merely a demonstration and is
38 * not suitable for use as an application, especially given that it relies
39 * on line buffered input from System.in. The best way to run this example
40 * is probably from a Win95 dos box into a Unix host.
41 * <p>
42 * Example: java rlogin myhost localusername remoteusername vt100
43 * <p>
44 * Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
45 * <p>
46 ***/
47
48 // This class requires the IOUtil support class!
49 public final class rlogin
50 {
51
52 public static final void main(String[] args)
53 {
54 String server, localuser, remoteuser, terminal;
55 RLoginClient client;
56
57 if (args.length != 4)
58 {
59 System.err.println(
60 "Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>");
61 System.exit(1);
62 return ; // so compiler can do proper flow control analysis
63 }
64
65 client = new RLoginClient();
66
67 server = args[0];
68 localuser = args[1];
69 remoteuser = args[2];
70 terminal = args[3];
71
72 try
73 {
74 client.connect(server);
75 }
76 catch (IOException e)
77 {
78 System.err.println("Could not connect to server.");
79 e.printStackTrace();
80 System.exit(1);
81 }
82
83 try
84 {
85 client.rlogin(localuser, remoteuser, terminal);
86 }
87 catch (IOException e)
88 {
89 try
90 {
91 client.disconnect();
92 }
93 catch (IOException f)
94 {}
95 e.printStackTrace();
96 System.err.println("rlogin authentication failed.");
97 System.exit(1);
98 }
99
100
101 IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
102 System.in, System.out);
103
104 try
105 {
106 client.disconnect();
107 }
108 catch (IOException e)
109 {
110 e.printStackTrace();
111 System.exit(1);
112 }
113
114 System.exit(0);
115 }
116
117 }
118