rlogin.java
/*
* 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 org.apache.commons.net.examples.unix;
import java.io.IOException;
import org.apache.commons.net.bsd.RLoginClient;
import org.apache.commons.net.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 {@code .rhosts} or {@code 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 Windows
* DOS box into a UNIX host.
* <p>
* Example: java rlogin myhost localuser remoteuser vt100
* <p>
* Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
*/
// This class requires the IOUtil support class!
public final class rlogin {
public static void main(final String[] args) {
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
}
final RLoginClient client = new RLoginClient();
final String server = args[0];
final String localuser = args[1];
final String remoteuser = args[2];
final String terminal = args[3];
try {
client.connect(server);
} catch (final IOException e) {
System.err.println("Could not connect to server.");
e.printStackTrace();
System.exit(1);
}
try {
client.rlogin(localuser, remoteuser, terminal);
} catch (final IOException e) {
try {
client.disconnect();
} catch (final IOException f) {
/* ignored */
}
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 (final IOException e) {
e.printStackTrace();
System.exit(1);
}
System.exit(0);
}
}