Pascal (Lazarus/Delphi)

Use an Existing Socket SSH Tunnel

Demonstrates the Chilkat MailMan.UseSshTunnel method, which configures MailMan to use an existing SSH tunnel provided by a Socket object for its SMTP and POP3 connections. This example opens and authenticates a tunnel on a Socket, hands it to MailMan, and then verifies an SMTP login through it.

Background: Sharing one already-established SSH tunnel across objects avoids opening (and authenticating) a separate SSH connection for every component that needs to reach the remote network. Here the tunnel lives on a Socket object, which MailMan then routes its SMTP/POP3 traffic through. It is the Socket-based sibling of UseSsh, which shares an Ssh object instead.

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Pascal (Lazarus/Delphi)

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.MailMan,
  Chilkat.Socket;

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

procedure RunDemo;
var
  success: Boolean;
  sshTunnel: TSocket;
  mailman: TMailMan;

begin
  success := False;

  //  Demonstrates the MailMan.UseSshTunnel method, which configures MailMan to use an existing
  //  SSH tunnel provided by a Socket object for its SMTP and POP3 connections.

  //  Open and authenticate the SSH tunnel using a Socket object.
  sshTunnel := TSocket.Create;
  success := sshTunnel.SshOpenTunnel('ssh.example.com',22);
  if (success = False) then
    begin
      WriteLn(sshTunnel.LastErrorText);
      Exit;
    end;

  success := sshTunnel.SshAuthenticatePw('sshUser','sshPassword');
  if (success = False) then
    begin
      WriteLn(sshTunnel.LastErrorText);
      Exit;
    end;

  mailman := TMailMan.Create;

  //  Configure the SMTP server connection.  These connections will travel through the tunnel.
  mailman.SmtpHost := 'smtp.example.com';
  mailman.SmtpPort := 465;
  mailman.SmtpSsl := True;
  mailman.SmtpUsername := 'user@example.com';
  mailman.SmtpPassword := 'myPassword';

  //  Tell MailMan to route its connections through the existing tunnel.
  success := mailman.UseSshTunnel(sshTunnel);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  SMTP operations now travel through the shared SSH tunnel.
  success := mailman.VerifySmtpLogin();
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  WriteLn('Authenticated with the SMTP server through the SSH tunnel.');


  sshTunnel.Free;
  mailman.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.