(Swift 3,4,5...) Multi-Hop SSH (SSH Through SSH)

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

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    let ssh1 = CkoSsh()!

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

    // Connect directly to the 1st SSH server:
    var success: Bool = ssh1.connect(hostname, port: port)
    if success != true {
        print("\(ssh1.lastErrorText!)")
        return
    }

    // Wait a max of 15 seconds when reading responses..
    ssh1.idleTimeoutMs = 15000

    // Authenticate using login/password:
    success = ssh1.authenticatePw("myLogin", password: "myPassword")
    if success != true {
        print("\(ssh1.lastErrorText!)")
        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.
    let ssh2 = CkoSsh()!
    success = ssh2.connectThroughSsh(ssh1, hostname: "someremoteserver.com", port: 22)
    if success != true {
        print("\(ssh2.lastErrorText!)")
        return
    }

    ssh2.idleTimeoutMs = 15000

    // Authenticate with ssh2...
    success = ssh2.authenticatePw("myLogin2", password: "myPassword2")
    if success != true {
        print("\(ssh2.lastErrorText!)")
        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..
    var channelNum: Int = ssh2.openSessionChannel().intValue
    if channelNum < 0 {
        print("\(ssh2.lastErrorText!)")
        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()

}