(Swift 3,4,5...) Multiple Hop SSH to SFTP

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task.

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? = "192.168.1.111"
    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
    }

    // 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 (for SFTP)
    // Note: Any number of connections may be simultaneously tunneled through a single
    // existing SSH connection.
    let sftp = CkoSFtp()!

    // Connect to some SSH/SFTP server through ssh1.
    success = sftp.connectThroughSsh(ssh1, hostname: "sftp.someremoteserver.com", port: 22)
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Authenticate with the SFTP server. 
    success = sftp.authenticatePw("myLogin", password: "myPassword")
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    // After authenticating, the SFTP subsystem must be initialized:
    success = sftp.initializeSftp()
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Upload from the local file to the SSH server.
    // Important -- the remote filepath is the 1st argument,
    // the local filepath is the 2nd argument;
    var remoteFilePath: String? = "hamlet.xml"
    var localFilePath: String? = "c:/temp/hamlet.xml"

    success = sftp.uploadFile(byName: remoteFilePath, localFilePath: localFilePath)
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    print("Success.")

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

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

    ssh1.disconnect()

}