Route Socket Connections through an SSH Object

See more Socket/SSL/TLS Examples

Demonstrates Socket.UseSsh, which configures a socket to route subsequent Connect calls through an already connected and authenticated Ssh object using SSH port forwarding.

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Ssh,
  Chilkat.Socket;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  ssh: TSsh;
  sshPassword: string;
  socket: TSocket;
  bTls: Boolean;
  maxWaitMs: Integer;

begin
  success := False;

  ssh := TSsh.Create;

  //  Connect and authenticate a standalone SSH object.
  success := ssh.Connect('ssh.example.com',22);
  if (success = False) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;

  //  The SSH password should come from a secure source rather than being hard-coded.
  sshPassword := 'mySshPassword';
  success := ssh.AuthenticatePw('sshUser',sshPassword);
  if (success = False) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;

  socket := TSocket.Create;

  //  Route subsequent Connect calls through the already connected and authenticated SSH object.  The
  //  destination is reached by SSH port forwarding rather than by a direct TCP connection.
  success := socket.UseSsh(ssh);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Connect to the destination through the SSH tunnel.
  bTls := False;
  maxWaitMs := 5000;
  success := socket.Connect('db.internal',5432,bTls,maxWaitMs);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;
  WriteLn('Connected to the destination through the SSH tunnel.');


  ssh.Free;
  socket.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.