DataFlex

POP3 over Multiple Hop SSH

Demonstrates how to read POP3 email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => POP3Server

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vSsh1
    Handle hoSsh1
    Variant vSsh2
    Handle hoSsh2
    Handle hoMailman
    Integer iNumMessages
    Variant vEmail
    Handle hoEmail
    Integer i
    String sTemp1
    String sTemp2

    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 = False) 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 = False) 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 = False) 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 = False) 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 POP3 server though the ssh2 tunnel (which itself is routed through ssh1).
    // The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => POP3Server
    Get pvComObject of hoSsh2 to vSsh2
    Get ComUseSsh Of hoMailman vSsh2 To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Set the POP3 server's hostname
    Set ComMailHost Of hoMailman To "pop.example.com"

    // Set the POP3 login/password.
    Set ComPopUsername Of hoMailman To "myLogin"
    Set ComPopPassword Of hoMailman To "myPassword"

    // Establish the POP3 connection through the ssh2 tunnel.
    Get ComPop3BeginSession Of hoMailman To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the number of messages in the mailbox.
    Get ComGetMailboxCount Of hoMailman To iNumMessages

    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End
    Move 1 To i
    While (i <= iNumMessages)
        // Fetch by the message number (not by the UIDL)
        Get pvComObject of hoEmail to vEmail
        Get ComFetchOne Of hoMailman False 0 i vEmail To iSuccess
        If (iSuccess = False) Begin
            Get ComLastErrorText Of hoMailman To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        Get ComFrom Of hoEmail To sTemp1
        Get ComSubject Of hoEmail To sTemp2
        Showln sTemp1 ": " sTemp2 (character(10))

        Move (i + 1) To i
    Loop

    // Close the connection with the POP3 server.  (This closes the tunnel through ssh2)
    // The connection with ssh2 is still alive, and may be used for more connections.
    Get ComPop3EndSession Of hoMailman To iSuccess

    // 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