Xbase++

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.

Xbase++

LOCAL nSuccess
LOCAL oSsh1
LOCAL oSsh2
LOCAL oMailman
LOCAL oEmail

nSuccess := 0

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

oSsh1 := CreateObject("Chilkat.Ssh")

//  Connect directly to the 1st SSH server.
nSuccess := oSsh1:Connect("serverssh1.com", 22)
IF (nSuccess != 1)
    ? oSsh1:LastErrorText
    oSsh1:destroy()
    RETURN
ENDIF

//  Authenticate using login/password:
nSuccess := oSsh1:AuthenticatePw("ssh1Login", "ssh1Password")
IF (nSuccess != 1)
    ? oSsh1:LastErrorText
    oSsh1:destroy()
    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.
oSsh2 := CreateObject("Chilkat.Ssh")
nSuccess := oSsh2:ConnectThroughSsh(oSsh1, "serverssh2.com", 22)
IF (nSuccess != 1)
    ? oSsh2:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    RETURN
ENDIF

//  Authenticate with ssh2...
nSuccess := oSsh2:AuthenticatePw("ssh2Login", "ssh2Password")
IF (nSuccess != 1)
    ? oSsh2:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    RETURN
ENDIF

oMailman := CreateObject("Chilkat.MailMan")

//  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
nSuccess := oMailman:UseSsh(oSsh2)
IF (nSuccess != 1)
    ? oMailman:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    oMailman:destroy()
    RETURN
ENDIF

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

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

//  Create a new email object
oEmail := CreateObject("Chilkat.Email")

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

nSuccess := oMailman:SendEmail(oEmail)
IF (nSuccess != 1)
    ? oMailman:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    oMailman:destroy()
    oEmail:destroy()
    RETURN
ENDIF

//  Close the connection with the server.  This closes the tunnel through ssh2.
nSuccess := oMailman:CloseSmtpConnection()
IF (nSuccess != 1)
    ? "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.
oSsh2:Disconnect()

oSsh1:Disconnect()

oSsh1:destroy()
oSsh2:destroy()
oMailman:destroy()
oEmail:destroy()