Open a Forwarded Channel through an SSH Tunnel

See more Socket/SSL/TLS Examples

Demonstrates Socket.SshNewChannel, which opens a port-forwarded channel through an authenticated SSH tunnel to a destination host and port, populating a Socket with the connected channel.

func chilkatTest() {
    var success: Bool = false

    let socket = CkoSocket()!

    //  Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
    //  not required.
    success = socket.sshOpenTunnel(sshHostname: "ssh.example.com", sshPort: 22)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    //  Authenticate the SSH session before opening forwarded channels.
    //  The SSH password should come from a secure source rather than being hard-coded.
    var sshPassword: String? = "mySshPassword"
    success = socket.sshAuthenticatePw(sshLogin: "sshUser", sshPassword: sshPassword)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    //  Open a port-forwarded channel through the authenticated SSH tunnel to the destination host and
    //  port, populating a Socket with the connected channel.  Set the 3rd argument to true to establish
    //  TLS to the destination inside the tunnel.
    var bTls: Bool = false
    var maxWaitMs: Int = 20000
    let channel = CkoSocket()!
    success = socket.sshNewChannel(hostname: "db.internal", port: 5432, ssl: bTls, maxWaitMs: maxWaitMs, channel: channel)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    //  Use the channel socket to send and receive with the destination through the tunnel.
    print("Forwarded channel opened to the destination.")

}