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;
019
020 import java.io.IOException;
021 import org.apache.commons.net.bsd.RLoginClient;
022
023 /***
024 * This is an example program demonstrating how to use the RLoginClient
025 * class. This program connects to an rlogin daemon and begins to
026 * interactively read input from stdin (this will be line buffered on most
027 * systems, so don't expect character at a time interactivity), passing it
028 * to the remote login process and writing the remote stdout and stderr
029 * to local stdout. If you don't have .rhosts or hosts.equiv files set up,
030 * the rlogin daemon will prompt you for a password.
031 * <p>
032 * On Unix systems you will not be able to use the rshell capability
033 * unless the process runs as root since only root can bind port addresses
034 * lower than 1024.
035 * <p>
036 * JVM's using green threads will likely have problems if the rlogin daemon
037 * requests a password. This program is merely a demonstration and is
038 * not suitable for use as an application, especially given that it relies
039 * on line buffered input from System.in. The best way to run this example
040 * is probably from a Win95 dos box into a Unix host.
041 * <p>
042 * Example: java rlogin myhost localusername remoteusername vt100
043 * <p>
044 * Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
045 * <p>
046 ***/
047
048 // This class requires the IOUtil support class!
049 public final class rlogin
050 {
051
052 public static final void main(String[] args)
053 {
054 String server, localuser, remoteuser, terminal;
055 RLoginClient client;
056
057 if (args.length != 4)
058 {
059 System.err.println(
060 "Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>");
061 System.exit(1);
062 return ; // so compiler can do proper flow control analysis
063 }
064
065 client = new RLoginClient();
066
067 server = args[0];
068 localuser = args[1];
069 remoteuser = args[2];
070 terminal = args[3];
071
072 try
073 {
074 client.connect(server);
075 }
076 catch (IOException e)
077 {
078 System.err.println("Could not connect to server.");
079 e.printStackTrace();
080 System.exit(1);
081 }
082
083 try
084 {
085 client.rlogin(localuser, remoteuser, terminal);
086 }
087 catch (IOException e)
088 {
089 try
090 {
091 client.disconnect();
092 }
093 catch (IOException f)
094 {}
095 e.printStackTrace();
096 System.err.println("rlogin authentication failed.");
097 System.exit(1);
098 }
099
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