/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package examples.unix;
import java.io.IOException;
import org.apache.commons.net.bsd.RLoginClient;
import examples.util.IOUtil;
/***
* 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 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 writing the remote stdout and stderr
* to local stdout. If you don't have .rhosts or hosts.equiv files set up,
* the rlogin daemon will prompt you for a password.
* <p>
* 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.
* <p>
* 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 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 Win95 dos box into a Unix host.
* <p>
* Example: java rlogin myhost localusername remoteusername vt100
* <p>
* Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
* <p>
***/
// This class requires the IOUtil support class!
public final class rlogin
{
public static final void main(String[] args)
{
String server, localuser, remoteuser, terminal;
RLoginClient client;
if (args.length != 4)
{
System.err.println(
"Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>");
System.exit(1);
return ; // so compiler can do proper flow control analysis
}
client = new RLoginClient();
server = args[0];
localuser = args[1];
remoteuser = args[2];
terminal = args[3];
try
{
client.connect(server);
}
catch (IOException e)
{
System.err.println("Could not connect to server.");
e.printStackTrace();
System.exit(1);
}
try
{
client.rlogin(localuser, remoteuser, terminal);
}
catch (IOException e)
{
try
{
client.disconnect();
}
catch (IOException f)
{}
e.printStackTrace();
System.err.println("rlogin authentication failed.");
System.exit(1);
}
IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
System.in, System.out);
try
{
client.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
System.exit(0);
}
}