(Go) 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.

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

    ssh1 := chilkat.NewSsh()

    // Connect directly to the 1st SSH server.
    success := ssh1.Connect("serverssh1.com",22)
    if success != true {
        fmt.Println(ssh1.LastErrorText())
        ssh1.DisposeSsh()
        return
    }

    // Authenticate using login/password:
    success = ssh1.AuthenticatePw("ssh1Login","ssh1Password")
    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,"serverssh2.com",22)
    if success != true {
        fmt.Println(ssh2.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        return
    }

    // Authenticate with ssh2...
    success = ssh2.AuthenticatePw("ssh2Login","ssh2Password")
    if success != true {
        fmt.Println(ssh2.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        return
    }

    imap := chilkat.NewImap()

    // 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.UseSsh(ssh2)
    if success != true {
        fmt.Println(imap.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        imap.DisposeImap()
        return
    }

    imap.SetSsl(true)
    imap.SetPort(993)

    // Connect to an IMAP server (through the multi-hop SSH tunnel)
    success = imap.Connect("imap.someimapserver.com")
    if success != true {
        fmt.Println(imap.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        imap.DisposeImap()
        return
    }

    // Login
    success = imap.Login("myLogin","myPassword")
    if success != true {
        fmt.Println(imap.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        imap.DisposeImap()
        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 {
        fmt.Println(imap.LastErrorText())
        ssh1.DisposeSsh()
        ssh2.DisposeSsh()
        imap.DisposeImap()
        return
    }

    fmt.Println("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()

    ssh1.DisposeSsh()
    ssh2.DisposeSsh()
    imap.DisposeImap()