(Swift 3,4,5...) IMAP over Multiple Hop SSH

Demonstrates how to read IMAP email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => IMAPServer

The ConnectThroughSsh and UseSsh methods are 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()!

    // Connect directly to the 1st SSH server.
    var success: Bool = ssh1.connect("serverssh1.com", port: 22)
    if success != true {
        print("\(ssh1.lastErrorText!)")
        return
    }

    // Authenticate using login/password:
    success = ssh1.authenticatePw("ssh1Login", password: "ssh1Password")
    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: "serverssh2.com", port: 22)
    if success != true {
        print("\(ssh2.lastErrorText!)")
        return
    }

    // Authenticate with ssh2...
    success = ssh2.authenticatePw("ssh2Login", password: "ssh2Password")
    if success != true {
        print("\(ssh2.lastErrorText!)")
        return
    }

    let imap = CkoImap()!

    // Tell the IMAP object to connect to the IMAP server though the ssh2 tunnel (which itself is routed through ssh1).
    // The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => IMAPServer
    success = imap.use(ssh2)
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    imap.ssl = true
    imap.port = 993

    // Connect to an IMAP server (through the multi-hop SSH tunnel)
    success = imap.connect("imap.someimapserver.com")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Login
    success = imap.login("myLogin", password: "myPassword")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Do whatever needs to be done...  for example,

    // Create the new email folder (sub-mailbox) on the IMAP server.
    // If no folder path is provided, the new folder is a sub-mailbox of Inbox.
    success = imap.createMailbox("newFolder")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    print("Success.")

    // Close the connection with the IMAP server.  (This closes the tunnel through ssh2)
    // The connection with ssh2 is still alive, and may be used for more connections.
    success = imap.disconnect()

    // 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()

}