(Java) SSH Tunnel for Database Connection (such as ADO, ODBC, JDBC, etc.)

Demonstrates how to create an SSH tunneling client in a background thread of your application. This makes it possible to SSH tunnel database connections without the need for separate software (such as PuTTY) to be running.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkGlobal chilkatGlob = new CkGlobal();
    boolean success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        System.out.println(chilkatGlob.lastErrorText());
        return;
        }

    CkSshTunnel tunnel = new CkSshTunnel();

    String sshHostname = "www.my-ssh-server.com";
    int sshPort = 22;

    //  Connect to an SSH server and establish the SSH tunnel:
    success = tunnel.Connect(sshHostname,sshPort);
    if (success != true) {
        System.out.println(tunnel.lastErrorText());
        return;
        }

    //  Authenticate with the SSH server via a login/password
    //  or with a public key.
    //  This example demonstrates SSH password authentication.
    success = tunnel.AuthenticatePw("mySshLogin","mySshPassword");
    if (success != true) {
        System.out.println(tunnel.lastErrorText());
        return;
        }

    //  The destination host/port is the database server.
    //  The DestHostname may be the domain name or
    //  IP address (in dotted decimal notation) of the database
    //  server.
    tunnel.put_DestPort(1433);
    tunnel.put_DestHostname("myDbServer.com");

    //  Start accepting connections in a background thread.
    //  The SSH tunnels are autonomously run in a background
    //  thread.  There is one background thread for accepting
    //  connections, and another for managing the tunnel pool.
    int listenPort = 3316;
    success = tunnel.BeginAccepting(listenPort);
    if (success != true) {
        System.out.println(tunnel.lastErrorText());
        return;
        }

    //  At this point the app may connect to the database server through
    //  the SSH tunnel.  The database connection string would
    //  use "localhost" for the hostname and 3316 for the port.
    //  We're not going to show the database coding here,
    //  because it can vary depending on the API you're using
    //  (ADO, ODBC, OLE DB, etc. )

    //  This is where the application's database code would go...

    //  Stop the background listen/accept thread:
    boolean waitForThreadExit = true;
    success = tunnel.StopAccepting(waitForThreadExit);
    if (success != true) {
        System.out.println(tunnel.lastErrorText());
        return;
        }

    //  Close the SSH tunnel (would also kick any remaining connected clients).
    success = tunnel.CloseTunnel(waitForThreadExit);
    if (success != true) {
        System.out.println(tunnel.lastErrorText());
        return;
        }
  }
}