Pascal (Lazarus/Delphi)

Route IMAP Through an Existing Ssh Connection

Demonstrates the Chilkat Imap.UseSsh method, which uses an already connected and authenticated Ssh object as the transport for IMAP connections. The only argument is the Ssh object. Call it before Connect. This example establishes the SSH connection separately, then routes IMAP through it.

Background: SSH supports multiple logical channels over one connection, so a single authenticated Ssh object can be shared — IMAP, SMTP, and other Chilkat objects can all tunnel through the same SSH session. This differs from SshOpenTunnel, where the Imap object owns and manages the tunnel itself; with UseSsh you manage the Ssh object's lifetime.

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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.Imap,
  Chilkat.Ssh;

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

procedure RunDemo;
var
  success: Boolean;
  imap: TImap;
  ssh: TSsh;
  sshPort: Integer;
  sshPassword: string;

begin
  success := False;

  //  Demonstrates the Imap.UseSsh method, which uses an already connected and authenticated Ssh
  //  object as the transport for IMAP connections.  The only argument is the Ssh object.  Call it
  //  before Connect.

  imap := TImap.Create;

  //  Establish and authenticate the SSH connection separately.
  ssh := TSsh.Create;
  sshPort := 22;
  success := ssh.Connect('ssh.example.com',sshPort);
  if (success = False) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;

  //  The SSH password is not hard-coded in source.  Insert code here to obtain it from an
  //  interactive prompt, environment variable, or a secrets vault.

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

  //  Use the SSH connection as the transport for IMAP.  One SSH connection can be shared by
  //  several Chilkat objects because SSH supports multiple channels.
  success := imap.UseSsh(ssh);
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  //  Now connect and log in to the IMAP server through the SSH connection.
  imap.Ssl := True;
  imap.Port := 993;
  success := imap.Connect('imap.example.com');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;
  success := imap.Login('user@example.com','myPassword');
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;

  success := imap.Disconnect();
  if (success = False) then
    begin
      WriteLn(imap.LastErrorText);
      Exit;
    end;


  imap.Free;
  ssh.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.