001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package examples.unix;
019
020 import java.io.IOException;
021 import org.apache.commons.net.bsd.RLoginClient;
022
023 import examples.util.IOUtil;
024
025 /***
026 * This is an example program demonstrating how to use the RLoginClient
027 * class. This program connects to an rlogin daemon and begins to
028 * interactively read input from stdin (this will be line buffered on most
029 * systems, so don't expect character at a time interactivity), passing it
030 * to the remote login process and writing the remote stdout and stderr
031 * to local stdout. If you don't have .rhosts or hosts.equiv files set up,
032 * the rlogin daemon will prompt you for a password.
033 * <p>
034 * On Unix systems you will not be able to use the rshell capability
035 * unless the process runs as root since only root can bind port addresses
036 * lower than 1024.
037 * <p>
038 * JVM's using green threads will likely have problems if the rlogin daemon
039 * requests a password. This program is merely a demonstration and is
040 * not suitable for use as an application, especially given that it relies
041 * on line buffered input from System.in. The best way to run this example
042 * is probably from a Win95 dos box into a Unix host.
043 * <p>
044 * Example: java rlogin myhost localusername remoteusername vt100
045 * <p>
046 * Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
047 * <p>
048 ***/
049
050 // This class requires the IOUtil support class!
051 public final class rlogin
052 {
053
054 public static final void main(String[] args)
055 {
056 String server, localuser, remoteuser, terminal;
057 RLoginClient client;
058
059 if (args.length != 4)
060 {
061 System.err.println(
062 "Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>");
063 System.exit(1);
064 return ; // so compiler can do proper flow control analysis
065 }
066
067 client = new RLoginClient();
068
069 server = args[0];
070 localuser = args[1];
071 remoteuser = args[2];
072 terminal = args[3];
073
074 try
075 {
076 client.connect(server);
077 }
078 catch (IOException e)
079 {
080 System.err.println("Could not connect to server.");
081 e.printStackTrace();
082 System.exit(1);
083 }
084
085 try
086 {
087 client.rlogin(localuser, remoteuser, terminal);
088 }
089 catch (IOException e)
090 {
091 try
092 {
093 client.disconnect();
094 }
095 catch (IOException f)
096 {}
097 e.printStackTrace();
098 System.err.println("rlogin authentication failed.");
099 System.exit(1);
100 }
101
102
103 IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
104 System.in, System.out);
105
106 try
107 {
108 client.disconnect();
109 }
110 catch (IOException e)
111 {
112 e.printStackTrace();
113 System.exit(1);
114 }
115
116 System.exit(0);
117 }
118
119 }
120