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(SQL Server) TCP Socket through SSH Tunnel (Port Forwarding)

Demonstrates using Chilkat Socket to communicate to a TCP service through an SSH tunnel. This example will connect to an NIST time server and (using the old Time Protocol (RFC 868)), will read the current GMT time.

Note: This is not necessarily a recommended means for getting the current date/time. The most commonly used time protocol is the Network Time Protocol (RFC-1305). The intent of this example is to show how TCP communications can occur through an SSH tunnel.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @tunnel int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Socket', @tunnel OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int

    --  Anything unlocks the component and begins a fully-functional 30-day trial.
    EXEC sp_OAMethod @tunnel, 'UnlockComponent', @success OUT, 'Anything for 30-day trial'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @tunnel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @tunnel
        RETURN
      END

    DECLARE @sshHostname nvarchar(4000)
    SELECT @sshHostname = 'www.my-ssh-server.com'
    DECLARE @sshPort int
    SELECT @sshPort = 22

    --  Connect to an SSH server and establish the SSH tunnel:
    EXEC sp_OAMethod @tunnel, 'SshOpenTunnel', @success OUT, @sshHostname, @sshPort
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @tunnel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @tunnel
        RETURN
      END

    --  Authenticate with the SSH server via a login/password
    --  or with a public key.
    --  This example demonstrates SSH password authentication.
    EXEC sp_OAMethod @tunnel, 'SshAuthenticatePw', @success OUT, 'mySshLogin', 'mySshPassword'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @tunnel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @tunnel
        RETURN
      END

    --  OK, the SSH tunnel is setup.  Now open a channel within the tunnel.
    --  Once the channel is obtained, the Socket API may
    --  be used exactly the same as usual, except all communications
    --  are sent through the channel in the SSH tunnel.
    --  Any number of channels may be created from the same SSH tunnel.
    --  Multiple channels may coexist at the same time.

    --  Connect to an NIST time server and read the current date/time
    DECLARE @channel int

    DECLARE @maxWaitMs int
    SELECT @maxWaitMs = 4000
    DECLARE @useTls int
    SELECT @useTls = 0
    EXEC sp_OAMethod @tunnel, 'SshOpenChannel', @channel OUT, 'time-c.nist.gov', 37, @useTls, @maxWaitMs
    IF @channel Is NULL 
      BEGIN
        EXEC sp_OAGetProperty @tunnel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @tunnel
        RETURN
      END

    --  The time server will send a big-endian 32-bit integer representing
    --  the number of seconds since since 00:00 (midnight) 1 January 1900 GMT.
    --  The ReceiveInt32 method will receive a 4-byte integer, but returns
    --  1 or 0 to indicate success.  If successful, the integer
    --  is obtained via the ReceivedInt property.
    DECLARE @bigEndian int
    SELECT @bigEndian = 1
    EXEC sp_OAMethod @channel, 'ReceiveInt32', @success OUT, @bigEndian
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @channel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @channel

        EXEC @hr = sp_OADestroy @tunnel
        RETURN
      END

    DECLARE @dt int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.CkDateTime', @dt OUT

    EXEC sp_OAGetProperty @channel, 'ReceivedInt', @iTmp0 OUT
    EXEC sp_OAMethod @dt, 'SetFromNtpTime', @success OUT, @iTmp0

    --  Show the current local date/time
    DECLARE @bLocalTime int
    SELECT @bLocalTime = 1

    EXEC sp_OAMethod @dt, 'GetAsRfc822', @sTmp0 OUT, @bLocalTime
    PRINT 'Current local date/time: ' + @sTmp0

    --  Close the SSH channel.
    EXEC sp_OAMethod @channel, 'Close', @success OUT, @maxWaitMs
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @channel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @channel

        EXEC @hr = sp_OADestroy @tunnel
        EXEC @hr = sp_OADestroy @dt
        RETURN
      END

    EXEC @hr = sp_OADestroy @channel

    --  It is possible to create a new channel from the existing SSH tunnel for the next connection:
    --  Any number of channels may be created from the same SSH tunnel.
    --  Multiple channels may coexist at the same time.
    EXEC sp_OAMethod @tunnel, 'SshOpenChannel', @channel OUT, 'time-a.nist.gov', 37, @useTls, @maxWaitMs
    IF @channel Is NULL 
      BEGIN
        EXEC sp_OAGetProperty @tunnel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @tunnel
        EXEC @hr = sp_OADestroy @dt
        RETURN
      END

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

    --  Close the connection to time-a.nist.gov.  This is actually closing our channel
    --  within the SSH tunnel, but keeps the tunnel open for the next port-forwarded connection.
    EXEC sp_OAMethod @channel, 'Close', @success OUT, @maxWaitMs
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @channel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @channel

        EXEC @hr = sp_OADestroy @tunnel
        EXEC @hr = sp_OADestroy @dt
        RETURN
      END

    EXEC @hr = sp_OADestroy @channel

    --  Finally, close the SSH tunnel.
    EXEC sp_OAMethod @tunnel, 'SshCloseTunnel', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @tunnel, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @tunnel
        EXEC @hr = sp_OADestroy @dt
        RETURN
      END


    PRINT 'TCP SSH tunneling example completed.'

    EXEC @hr = sp_OADestroy @tunnel
    EXEC @hr = sp_OADestroy @dt


END
GO

 

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