(Swift) 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.

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func chilkatTest() {
    let chilkatGlob = CkoGlobal()
    var success: Bool = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
    if success != true {
        print("\(chilkatGlob.LastErrorText)")
        return
    }

    let tunnel = CkoSshTunnel()

    var sshHostname: String? = "www.my-ssh-server.com"
    var sshPort: Int = 22

    //  Connect to an SSH server and establish the SSH tunnel:
    success = tunnel.Connect(sshHostname, port: sshPort)
    if success != true {
        print("\(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", password: "mySshPassword")
    if success != true {
        print("\(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.DestPort = 1433
    tunnel.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.
    var listenPort: Int = 3316
    success = tunnel.BeginAccepting(listenPort)
    if success != true {
        print("\(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:
    var waitForThreadExit: Bool = true
    success = tunnel.StopAccepting(waitForThreadExit)
    if success != true {
        print("\(tunnel.LastErrorText)")
        return
    }

    //  Close the SSH tunnel (would also kick any remaining connected clients).
    success = tunnel.CloseTunnel(waitForThreadExit)
    if success != true {
        print("\(tunnel.LastErrorText)")
        return
    }


}