(Delphi ActiveX) 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.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
chilkatGlob: TChilkatGlobal;
success: Integer;
tunnel: TChilkatSshTunnel;
sshHostname: WideString;
sshPort: Integer;
listenPort: Integer;
waitForThreadExit: Integer;

begin
chilkatGlob := TChilkatGlobal.Create(Self);
success := chilkatGlob.UnlockBundle('Anything for 30-day trial.');
if (success <> 1) then
  begin
    Memo1.Lines.Add(chilkatGlob.LastErrorText);
    Exit;
  end;

tunnel := TChilkatSshTunnel.Create(Self);

sshHostname := 'sftp.example.com';
sshPort := 22;

// Connect to an SSH server and establish the SSH tunnel:
success := tunnel.Connect(sshHostname,sshPort);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// 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 <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// 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.
listenPort := 3316;
success := tunnel.BeginAccepting(listenPort);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// 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:
waitForThreadExit := 1;
success := tunnel.StopAccepting(waitForThreadExit);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;

// Close the SSH tunnel (would also kick any remaining connected clients).
success := tunnel.CloseTunnel(waitForThreadExit);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tunnel.LastErrorText);
    Exit;
  end;
end;