DataFlex

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.

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vSsh1
    Handle hoSsh1
    Variant vSsh2
    Handle hoSsh2
    Handle hoMailman
    Variant vEmail
    Handle hoEmail
    String sTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatSsh)) To hoSsh1
    If (Not(IsComObjectCreated(hoSsh1))) Begin
        Send CreateComObject of hoSsh1
    End

    // Connect directly to the 1st SSH server.
    Get ComConnect Of hoSsh1 "serverssh1.com" 22 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh1 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Authenticate using login/password:
    Get ComAuthenticatePw Of hoSsh1 "ssh1Login" "ssh1Password" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh1 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // 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.
    Get Create (RefClass(cComChilkatSsh)) To hoSsh2
    If (Not(IsComObjectCreated(hoSsh2))) Begin
        Send CreateComObject of hoSsh2
    End
    Get pvComObject of hoSsh1 to vSsh1
    Get ComConnectThroughSsh Of hoSsh2 vSsh1 "serverssh2.com" 22 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Authenticate with ssh2...
    Get ComAuthenticatePw Of hoSsh2 "ssh2Login" "ssh2Password" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    // 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
    Get pvComObject of hoSsh2 to vSsh2
    Get ComUseSsh Of hoMailman vSsh2 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Set the SMTP server.
    Set ComSmtpHost Of hoMailman To "smtp.someserver.com"

    // Set the SMTP login/password (if required)
    Set ComSmtpUsername Of hoMailman To "myUsername"
    Set ComSmtpPassword Of hoMailman To "myPassword"

    // Create a new email object
    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End

    Set ComSubject Of hoEmail To "This is a test"
    Set ComBody Of hoEmail To "This is a test"
    Set ComFrom Of hoEmail To "Chilkat Support <support@chilkatsoft.com>"
    Get ComAddTo Of hoEmail "Chilkat Admin" "admin@chilkatsoft.com" To iSuccess

    Get pvComObject of hoEmail to vEmail
    Get ComSendEmail Of hoMailman vEmail To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Close the connection with the server.  This closes the tunnel through ssh2.
    Get ComCloseSmtpConnection Of hoMailman To iSuccess
    If (iSuccess <> True) Begin
        Showln "Connection to SMTP server not closed cleanly."
    End

    Showln "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.
    Send ComDisconnect To hoSsh2

    Send ComDisconnect To hoSsh1


End_Procedure