SQL Server

Multiple Hop SSH to SFTP

See more SFTP Examples

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is 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 assumes 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

    -- Hostname may be an IP address or domain name:
    DECLARE @hostname nvarchar(4000)
    SELECT @hostname = '192.168.1.111'
    DECLARE @port nvarchar(4000)
    SELECT @port = 22

    -- Connect directly to the 1st SSH server:
    EXEC sp_OAMethod @ssh1, 'Connect', @success OUT, @hostname, @port
    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, 'myLogin', 'myPassword'
    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 (for SFTP)
    -- Note: Any number of connections may be simultaneously tunneled through a single
    -- existing SSH connection.
    DECLARE @sftp int
    EXEC @hr = sp_OACreate 'Chilkat.SFtp', @sftp OUT

    -- Connect to some SSH/SFTP server through ssh1.
    EXEC sp_OAMethod @sftp, 'ConnectThroughSsh', @success OUT, @ssh1, 'sftp.someremoteserver.com', 22
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END

    -- Authenticate with the SFTP server. 
    EXEC sp_OAMethod @sftp, 'AuthenticatePw', @success OUT, 'myLogin', 'myPassword'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END

    -- After authenticating, the SFTP subsystem must be initialized:
    EXEC sp_OAMethod @sftp, 'InitializeSftp', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END

    -- Upload from the local file to the SSH server.
    -- Important -- the remote filepath is the 1st argument,
    -- the local filepath is the 2nd argument;
    DECLARE @remoteFilePath nvarchar(4000)
    SELECT @remoteFilePath = 'hamlet.xml'
    DECLARE @localFilePath nvarchar(4000)
    SELECT @localFilePath = 'c:/temp/hamlet.xml'

    EXEC sp_OAMethod @sftp, 'UploadFileByName', @success OUT, @remoteFilePath, @localFilePath
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ssh1
        EXEC @hr = sp_OADestroy @sftp
        RETURN
      END


    PRINT 'Success.'

    -- Close the connection with the SFTP server.(This closes the the tunnel through ssh1.)
    -- The connection with ssh1 is still alive, and may be used for more connections.
    EXEC sp_OAMethod @sftp, 'Disconnect', NULL

    -- ...
    -- ...
    -- ...

    EXEC sp_OAMethod @ssh1, 'Disconnect', NULL

    EXEC @hr = sp_OADestroy @ssh1
    EXEC @hr = sp_OADestroy @sftp


END
GO