SQL Server

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.

SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    DECLARE @ssh1 int
    EXEC @hr = sp_OACreate 'Chilkat.Ssh', @ssh1 OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Connect directly to the 1st SSH server.
    EXEC sp_OAMethod @ssh1, 'Connect', @success OUT, 'serverssh1.com', 22
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ssh1, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        RETURN
      END

    -- Authenticate using login/password:
    EXEC sp_OAMethod @ssh1, 'AuthenticatePw', @success OUT, 'ssh1Login', 'ssh1Password'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ssh1, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        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.
    DECLARE @ssh2 int
    EXEC @hr = sp_OACreate 'Chilkat.Ssh', @ssh2 OUT

    EXEC sp_OAMethod @ssh2, 'ConnectThroughSsh', @success OUT, @ssh1, 'serverssh2.com', 22
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ssh2, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @ssh2
        RETURN
      END

    -- Authenticate with ssh2...
    EXEC sp_OAMethod @ssh2, 'AuthenticatePw', @success OUT, 'ssh2Login', 'ssh2Password'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ssh2, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @ssh2
        RETURN
      END

    DECLARE @mailman int
    EXEC @hr = sp_OACreate 'Chilkat.MailMan', @mailman OUT

    -- 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
    EXEC sp_OAMethod @mailman, 'UseSsh', @success OUT, @ssh2
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @ssh2
        EXEC @hr = sp_OADestroy @mailman
        RETURN
      END

    -- Set the SMTP server.
    EXEC sp_OASetProperty @mailman, 'SmtpHost', 'smtp.someserver.com'

    -- Set the SMTP login/password (if required)
    EXEC sp_OASetProperty @mailman, 'SmtpUsername', 'myUsername'
    EXEC sp_OASetProperty @mailman, 'SmtpPassword', 'myPassword'

    -- Create a new email object
    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    EXEC sp_OASetProperty @email, 'Subject', 'This is a test'
    EXEC sp_OASetProperty @email, 'Body', 'This is a test'
    EXEC sp_OASetProperty @email, 'From', 'Chilkat Support <support@chilkatsoft.com>'
    EXEC sp_OAMethod @email, 'AddTo', @success OUT, 'Chilkat Admin', 'admin@chilkatsoft.com'

    EXEC sp_OAMethod @mailman, 'SendEmail', @success OUT, @email
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @ssh2
        EXEC @hr = sp_OADestroy @mailman
        EXEC @hr = sp_OADestroy @email
        RETURN
      END

    -- Close the connection with the server.  This closes the tunnel through ssh2.
    EXEC sp_OAMethod @mailman, 'CloseSmtpConnection', @success OUT
    IF @success <> 1
      BEGIN

        PRINT 'Connection to SMTP server not closed cleanly.'
      END


    PRINT '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.
    EXEC sp_OAMethod @ssh2, 'Disconnect', NULL

    EXEC sp_OAMethod @ssh1, 'Disconnect', NULL

    EXEC @hr = sp_OADestroy @ssh1
    EXEC @hr = sp_OADestroy @ssh2
    EXEC @hr = sp_OADestroy @mailman
    EXEC @hr = sp_OADestroy @email


END
GO