/*
* Copyright 2001-2005 The Apache Software Foundation
*
* Licensed 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;
import java.io.IOException;
import org.apache.commons.net.bsd.RCommandClient;
/***
* This is an example program demonstrating how to use the RCommandClient
* class. This program connects to an rshell daemon and requests that the
* given command be executed on the server. It then reads 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 process and writes
* the process stdout and stderr to local stdout.
* <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>
* Example: java rshell myhost localusername remoteusername "ps -aux"
* <p>
* Usage: rshell <hostname> <localuser> <remoteuser> <command>
* <p>
***/
// This class requires the IOUtil support class!
public final class rshell
{
public static final void main(String[] args)
{
String server, localuser, remoteuser, command;
RCommandClient client;
if (args.length != 4)
{
System.err.println(
"Usage: rshell <hostname> <localuser> <remoteuser> <command>");
System.exit(1);
return ; // so compiler can do proper flow control analysis
}
client = new RCommandClient();
server = args[0];
localuser = args[1];
remoteuser = args[2];
command = args[3];
try
{
client.connect(server);
}
catch (IOException e)
{
System.err.println("Could not connect to server.");
e.printStackTrace();
System.exit(1);
}
try
{
client.rcommand(localuser, remoteuser, command);
}
catch (IOException e)
{
try
{
client.disconnect();
}
catch (IOException f)
{}
e.printStackTrace();
System.err.println("Could not execute command.");
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);
}
}