Connects to an rshell daemon

/*
 * 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 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);
    }

}

apache_net.zip( 395 k)

Related examples in the same category

1.	Implement the finger command in Java
2.	Finger client
3.	Implement the Linux fwhois command in Java
4.	Use the TimeTCPClient and TimeUDPClient: simple Unix rdate
5.	Connects to an rexec server
6.	Connects to an rlogin daemon

Connects to an rshell daemon : Net Command « Network Protocol « Java

Related examples in the same category