(Lianja) SMTP over Multiple Hop SSH

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

Application => ServerSSH1 => ServerSSH2 => SmtpServer

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

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

loSsh1 = createobject("CkSsh")

// Connect directly to the 1st SSH server.
llSuccess = loSsh1.Connect("serverssh1.com",22)
if (llSuccess <> .T.) then
    ? loSsh1.LastErrorText
    release loSsh1
    return
endif

// Authenticate using login/password:
llSuccess = loSsh1.AuthenticatePw("ssh1Login","ssh1Password")
if (llSuccess <> .T.) then
    ? loSsh1.LastErrorText
    release loSsh1
    return
endif

// 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.
loSsh2 = createobject("CkSsh")
llSuccess = loSsh2.ConnectThroughSsh(loSsh1,"serverssh2.com",22)
if (llSuccess <> .T.) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

// Authenticate with ssh2...
llSuccess = loSsh2.AuthenticatePw("ssh2Login","ssh2Password")
if (llSuccess <> .T.) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

loMailman = createobject("CkMailMan")

// Tell the mailman object to connect to the SMTP server though the ssh2 tunnel (which itself is routed through ssh1).
// The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => SMTPServer
llSuccess = loMailman.UseSsh(loSsh2)
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loSsh1
    release loSsh2
    release loMailman
    return
endif

// Set the SMTP server.
loMailman.SmtpHost = "smtp.someserver.com"

// Set the SMTP login/password (if required)
loMailman.SmtpUsername = "myUsername"
loMailman.SmtpPassword = "myPassword"

// Create a new email object
loEmail = createobject("CkEmail")

loEmail.Subject = "This is a test"
loEmail.Body = "This is a test"
loEmail.From = "Chilkat Support <support@chilkatsoft.com>"
llSuccess = loEmail.AddTo("Chilkat Admin","admin@chilkatsoft.com")

llSuccess = loMailman.SendEmail(loEmail)
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loSsh1
    release loSsh2
    release loMailman
    release loEmail
    return
endif

// Close the connection with the server.  This closes the tunnel through ssh2.
llSuccess = loMailman.CloseSmtpConnection()
if (llSuccess <> .T.) then
    ? "Connection to SMTP server not closed cleanly."
endif

? "Mail Sent!"

// 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.
loSsh2.Disconnect()

loSsh1.Disconnect()


release loSsh1
release loSsh2
release loMailman
release loEmail