(VB.NET) SSH Tunnel for Database Connection (such as ADO, ODBC, JDBC, etc.)

Demonstrates how to create an SSH tunneling client in a background thread of your application. This makes it possible to SSH tunnel database connections without the need for separate software (such as PuTTY) to be running.

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Dim chilkatGlob As New Chilkat.Global
Dim success As Boolean = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
If (success <> True) Then
    Debug.WriteLine(chilkatGlob.LastErrorText)
    Exit Sub
End If


Dim tunnel As New Chilkat.SshTunnel

Dim sshHostname As String = "www.my-ssh-server.com"
Dim sshPort As Integer = 22

'  Connect to an SSH server and establish the SSH tunnel:
success = tunnel.Connect(sshHostname,sshPort)
If (success <> True) Then
    Debug.WriteLine(tunnel.LastErrorText)
    Exit Sub
End If


'  Authenticate with the SSH server via a login/password
'  or with a public key.
'  This example demonstrates SSH password authentication.
success = tunnel.AuthenticatePw("mySshLogin","mySshPassword")
If (success <> True) Then
    Debug.WriteLine(tunnel.LastErrorText)
    Exit Sub
End If


'  The destination host/port is the database server.
'  The DestHostname may be the domain name or
'  IP address (in dotted decimal notation) of the database
'  server.
tunnel.DestPort = 1433
tunnel.DestHostname = "myDbServer.com"


'  Start accepting connections in a background thread.
'  The SSH tunnels are autonomously run in a background
'  thread.  There is one background thread for accepting
'  connections, and another for managing the tunnel pool.
Dim listenPort As Integer = 3316
success = tunnel.BeginAccepting(listenPort)
If (success <> True) Then
    Debug.WriteLine(tunnel.LastErrorText)
    Exit Sub
End If



'  At this point the app may connect to the database server through
'  the SSH tunnel.  The database connection string would
'  use "localhost" for the hostname and 3316 for the port.
'  We're not going to show the database coding here,
'  because it can vary depending on the API you're using
'  (ADO, ODBC, OLE DB, etc. )


'  This is where the application's database code would go...






'  Stop the background listen/accept thread:
Dim waitForThreadExit As Boolean = True
success = tunnel.StopAccepting(waitForThreadExit)
If (success <> True) Then
    Debug.WriteLine(tunnel.LastErrorText)
    Exit Sub
End If


'  Close the SSH tunnel (would also kick any remaining connected clients).
success = tunnel.CloseTunnel(waitForThreadExit)
If (success <> True) Then
    Debug.WriteLine(tunnel.LastErrorText)
    Exit Sub
End If