import java.io.File;
import java.io.IOException;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.LocalPortForwarder;
public class PortForwarding
{
public static void sleepSomeTime(long milliSeconds)
{
try
{
Thread.sleep(milliSeconds);
}
catch (InterruptedException e)
{
}
}
public static void main(String[] args)
{
String hostname = "127.0.0.1";
String username = "joe";
File keyfile = new File("~/.ssh/id_rsa"); // or "~/.ssh/id_dsa"
String keyfilePass = "joespass"; // will be ignored if not needed
try
{
/* Create a connection instance */
Connection conn = new Connection(hostname);
/* Now connect */
conn.connect();
/* Authenticate */
boolean isAuthenticated = conn.authenticateWithPublicKey(username, keyfile, keyfilePass);
if (isAuthenticated == false)
throw new IOException("Authentication failed.");
/* ===== OK, now let's establish some local port forwardings ===== */
/* Example Port Forwarding: -L 8080:www.ethz.ch:80 (OpenSSH notation)
*
* This works by allocating a socket to listen on 8080 on the local interface (127.0.0.1).
* Whenever a connection is made to this port (127.0.0.1:8080), the connection is forwarded
* over the secure channel, and a connection is made to www.ethz.ch:80 from the remote
* machine (i.e., the ssh server).
*
* (the above text is based partially on the OpenSSH man page)
*/
/* You can create as many of them as you want */
LocalPortForwarder lpf1 = conn.createLocalPortForwarder(8080, "www.ethz.ch", 80);
/* Now simply point your webbrowser to 127.0.0.1:8080 */
/* (on the host where you execute this program) */
/* ===== OK, now let's establish some remote port forwardings ===== */
/* Example Port Forwarding: -R 127.0.0.1:8080:www.ganymed.ethz.ch:80 (OpenSSH notation)
*
* Specifies that the port 127.0.0.1:8080 on the remote server is to be forwarded to the
* given host and port on the local side. This works by allocating a socket to listen to port
* 8080 on the remote side (the ssh server), and whenever a connection is made to this port, the
* connection is forwarded over the secure channel, and a connection is made to
* www.ganymed.ethz.ch:80 by the Ganymed SSH-2 library.
*
* (the above text is based partially on the OpenSSH man page)
*/
/* You can create as many of them as you want */
conn.requestRemotePortForwarding("127.0.0.1", 8080, "www.ganymed.ethz.ch", 80);
/* Now, on the ssh server, if you connect to 127.0.0.1:8080, then the connection is forwarded
* through the secure tunnel to the library, which in turn will forward the connection
* to www.ganymed.ethz.ch:80. */
/* Sleep a bit... (30 seconds) */
sleepSomeTime(30000);
/* Stop accepting remote connections that are being forwarded to www.ganymed.ethz.ch:80 */
conn.cancelRemotePortForwarding(8080);
/* Sleep a bit... (20 seconds) */
sleepSomeTime(20000);
/* Stop accepting connections on 127.0.0.1:8080 that are being forwarded to www.ethz.ch:80 */
lpf1.close();
/* Close the connection */
conn.close();
}
catch (IOException e)
{
e.printStackTrace(System.err);
System.exit(2);
}
}
}