DataFlex

POP3 SSH Tunneling (Port Forwarding)

Demonstrates how to connect to a POP3 server through an SSH tunnel. Reads a POP3 mailbox and display the FROM and SUBJECT header fields of each email. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoMailman
    String sSshHostname
    Integer iSshPort
    Integer iNumToDownload
    Integer i
    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.

    // The mailman object is used for receiving (POP3) 
    // and sending (SMTP) email.
    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    // The SSH hostname may be a hostname or an 
    // IP address, such as "192.168.1.108".
    // The port is typically 22 (the standard port for SSH).
    Move "sftp.example.com" To sSshHostname
    Move 22 To iSshPort

    // Connect to an SSH server and establish the SSH tunnel:
    Get ComSshOpenTunnel Of hoMailman sSshHostname iSshPort To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Authenticate with the SSH server via a login/password
    // or with a public key.
    // This example demonstrates SSH password authentication.
    // Note: This is not authenticating with the POP3 server, it is
    // for authenticating with the SSH server, which is separate.
    Get ComSshAuthenticatePw Of hoMailman "ssh_login" "ssh_password" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // OK, the SSH tunnel is setup.  The mailman may
    // be used exactly the same as usual, except all communications
    // are now sent through the SSH tunnel.

    // The SSH tunnel may be kept open for any number of 
    // POP3 connections.  

    // Set the POP3 server's hostname
    Set ComMailHost Of hoMailman To "mail.my-pop3-server.com"

    // Set the POP3 settings for your POP3 server:
    Set ComPopUsername Of hoMailman To "pop3_login"
    Set ComPopPassword Of hoMailman To "pop3_password"
    Set ComMailPort Of hoMailman To 995
    Set ComPopSsl Of hoMailman To True

    // Connect to the POP3 server through the already-established SSH tunnel:
    Get ComPop3BeginSession Of hoMailman To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // A visual inspection of the LastErrorText after
    // a successful POP3 connection will confirm the SSH tunneling.
    // Note: If the POP3 connection uses SSL/TLS, then the SSL/TLS 
    // secure channel will be wrapped within the SSH tunnel.
    Get ComLastErrorText Of hoMailman To sTemp1
    Showln sTemp1

    // How many messages are in the POP3 inbox?
    Get ComGetMailboxCount Of hoMailman To iNumToDownload
    If (iNumToDownload > 5) Begin
        Move 5 To iNumToDownload
    End

    If (iNumToDownload = 0) Begin
        Showln "No messages in the POP3 inbox."
        Procedure_Return
    End

    // Download a max of 5 messages

    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End
    For i From 1 To iNumToDownload
        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
        Showln sTemp1
        Get ComSubject Of hoEmail To sTemp1
        Showln sTemp1
        Showln "----"
    Loop

    // Close the connection with the POP3 server, leaving the SSH tunnel open for subsequent POP3 connections.
    Get ComPop3EndSession Of hoMailman To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Try connecting to a different POP3 server through the same aleady setup SSH tunnel:
    // Set the POP3 server's hostname
    Set ComMailHost Of hoMailman To "mail.my-pop3-server2.com"

    // Set the POP3 settings for your POP3 server:
    Set ComPopUsername Of hoMailman To "pop3_login2"
    Set ComPopPassword Of hoMailman To "pop3_password2"
    Set ComMailPort Of hoMailman To 110
    Set ComPopSsl Of hoMailman To False

    Get ComPop3BeginSession Of hoMailman To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Review the LastErrorText to see that the connection was made via the SSH tunnel:
    Get ComLastErrorText Of hoMailman To sTemp1
    Showln sTemp1

    Get ComPop3EndSession Of hoMailman To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Close the SSH tunnel.
    Get ComSshCloseTunnel Of hoMailman To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End



End_Procedure