SQL Server

IMAP SSH Tunneling (Port Forwarding)

Demonstrates how to setup and use an SSH tunnel for IMAP. 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 assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @imap int
    EXEC @hr = sp_OACreate 'Chilkat.Imap', @imap OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    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).
    DECLARE @sshHostname nvarchar(4000)
    SELECT @sshHostname = 'www.mysshserver.com'
    DECLARE @sshPort int
    SELECT @sshPort = 22

    -- Connect to an SSH server and establish the SSH tunnel:
    EXEC sp_OAMethod @imap, 'SshOpenTunnel', @success OUT, @sshHostname, @sshPort
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        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 IMAP server, it is
    -- for authenticating with the SSH server, which is separate.
    EXEC sp_OAMethod @imap, 'SshAuthenticatePw', @success OUT, 'mySshLogin', 'mySshPassword'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- OK, the SSH tunnel is setup.  The IMAP component may
    -- be used exactly the same as usual, except all communications
    -- are sent through the SSH tunnel.

    -- Connect to an IMAP server via the SSH tunnel.
    -- Because the SSH tunnel has been previously setup,
    -- this does not establish a direct connection with the IMAP
    -- server.  It directs the SSH server to establish the connection.

    -- In this example, the IMAP server requires SSL/TLS.  The TLS connection
    -- will be enclosed within the SSH tunnel.
    EXEC sp_OASetProperty @imap, 'Ssl', 1
    EXEC sp_OASetProperty @imap, 'Port', 993
    EXEC sp_OAMethod @imap, 'Connect', @success OUT, 'imap.my-imap-server.com'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Authenticate with the IMAP server via the SSH tunnel.
    EXEC sp_OAMethod @imap, 'Login', @success OUT, 'myLogin', 'myPassword'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Select an IMAP mailbox
    EXEC sp_OAMethod @imap, 'SelectMailbox', @success OUT, 'Inbox'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- How many messages in Inbox?
    DECLARE @msgCount int
    EXEC sp_OAGetProperty @imap, 'NumMessages', @msgCount OUT
    IF @msgCount = 0
      BEGIN

        PRINT 'No messages found.'
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    DECLARE @upperBound int
    SELECT @upperBound = 10
    IF @msgCount < @upperBound
      BEGIN
        SELECT @upperBound = @msgCount
      END

    -- Download up to the 1st 10 messages.
    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    DECLARE @i int

    DECLARE @bUid int
    SELECT @bUid = 0
    SELECT @i = 1
    WHILE @i <= @upperBound
      BEGIN

        EXEC sp_OAMethod @imap, 'FetchEmail', @success OUT, 0, @i, @bUid, @email
        IF @success = 0
          BEGIN
            EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
            PRINT @sTmp0
            EXEC @hr = sp_OADestroy @imap
            EXEC @hr = sp_OADestroy @email
            RETURN
          END

        EXEC sp_OAGetProperty @email, 'From', @sTmp0 OUT
        PRINT @sTmp0
        EXEC sp_OAGetProperty @email, 'Subject', @sTmp0 OUT
        PRINT @sTmp0

        PRINT '----'
        SELECT @i = @i + 1
      END

    -- Disconnect from the IMAP server.
    -- The SSH tunnel remains open.
    EXEC sp_OAMethod @imap, 'Disconnect', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        EXEC @hr = sp_OADestroy @email
        RETURN
      END

    -- It is possible to re-use the existing SSH tunnel for the next connection:
    EXEC sp_OAMethod @imap, 'Connect', @success OUT, 'imap.my-imap-server2.com'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        EXEC @hr = sp_OADestroy @email
        RETURN
      END

    -- Review the LastErrorText to see that the connection was made via the SSH tunnel:
    EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
    PRINT @sTmp0

    EXEC sp_OAMethod @imap, 'Disconnect', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        EXEC @hr = sp_OADestroy @email
        RETURN
      END

    -- Finally, close the SSH tunnel.
    EXEC sp_OAMethod @imap, 'SshCloseTunnel', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        EXEC @hr = sp_OADestroy @email
        RETURN
      END


    PRINT 'IMAP SSH tunneling example completed.'

    EXEC @hr = sp_OADestroy @imap
    EXEC @hr = sp_OADestroy @email


END
GO