Go

Multi-Hop SSH (SSH Through SSH)

See more SSH Examples

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

Go

    success := false

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    ssh1 := chilkat.NewSsh()

    // Hostname may be an IP address or domain name:
    hostname := "192.168.1.108"
    port := 22

    // Connect directly to the 1st SSH server:
    success = ssh1.Connect(hostname,port)
    if success != true {
        fmt.Println(ssh1.LastErrorText())
        ssh1.DisposeSsh()
        return
    }

    // Wait a max of 15 seconds when reading responses..
    ssh1.SetIdleTimeoutMs(15000)

    // Authenticate using login/password:
    success = ssh1.AuthenticatePw("myLogin","myPassword")
    if success != true {
        fmt.Println(ssh1.LastErrorText())
        ssh1.DisposeSsh()
        return
    }

    // Connect through the 1st SSH connection to reach a 2nd SSH server.
    // Note: Any number of SSH connections may be simultaneously tunneled through a single
    // existing SSH connection.
    ssh2 := chilkat.NewSsh()
    success = ssh2.ConnectThroughSsh(ssh1,"someremoteserver.com",22)
    if success != true {
        fmt.Println(ssh2.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        return
    }

    ssh2.SetIdleTimeoutMs(15000)

    // Authenticate with ssh2...
    success = ssh2.AuthenticatePw("myLogin2","myPassword2")
    if success != true {
        fmt.Println(ssh2.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        return
    }

    // The application may now is connected and authenticated with ssh2.
    // The application can do whatever it desires just as if it was directly
    // connected to ssh2.   For example, the application might open
    // a session channel to send commands or start a remote shell..
    channelNum := ssh2.OpenSessionChannel()
    if channelNum < 0 {
        fmt.Println(ssh2.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        return
    }

    // ...
    // ...
    // ...

    // Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
    // The connection with ssh1 is still alive, and may be used for more connections.
    ssh2.Disconnect()

    // ...
    // ...
    // ...

    ssh1.Disconnect()

    ssh1.DisposeSsh()
    ssh2.DisposeSsh()