Visual FoxPro

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loSsh1
LOCAL loSsh2
LOCAL loMailman
LOCAL loEmail

lnSuccess = 0

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

loSsh1 = CreateObject('Chilkat.Ssh')

* Connect directly to the 1st SSH server.
lnSuccess = loSsh1.Connect("serverssh1.com",22)
IF (lnSuccess <> 1) THEN
    ? loSsh1.LastErrorText
    RELEASE loSsh1
    CANCEL
ENDIF

* Authenticate using login/password:
lnSuccess = loSsh1.AuthenticatePw("ssh1Login","ssh1Password")
IF (lnSuccess <> 1) THEN
    ? loSsh1.LastErrorText
    RELEASE loSsh1
    CANCEL
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('Chilkat.Ssh')
lnSuccess = loSsh2.ConnectThroughSsh(loSsh1,"serverssh2.com",22)
IF (lnSuccess <> 1) THEN
    ? loSsh2.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    CANCEL
ENDIF

* Authenticate with ssh2...
lnSuccess = loSsh2.AuthenticatePw("ssh2Login","ssh2Password")
IF (lnSuccess <> 1) THEN
    ? loSsh2.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    CANCEL
ENDIF

loMailman = 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
lnSuccess = loMailman.UseSsh(loSsh2)
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    RELEASE loMailman
    CANCEL
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('Chilkat.Email')

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

lnSuccess = loMailman.SendEmail(loEmail)
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    RELEASE loMailman
    RELEASE loEmail
    CANCEL
ENDIF

* Close the connection with the server.  This closes the tunnel through ssh2.
lnSuccess = loMailman.CloseSmtpConnection()
IF (lnSuccess <> 1) 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