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