package examples;
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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);
}
}