MSWindowsWatchdog.h

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/*
 * Deskflow -- mouse and keyboard sharing utility
 * SPDX-FileCopyrightText: (C) 2012 - 2025 Synergy App Ltd
 * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
 */
 
#pragma once
 
#include "mt/Thread.h"
#include "platform/MSWindowsProcess.h"
#include "platform/MSWindowsSession.h"
 
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
 
#include <memory>
#include <mutex>
#include <optional>
#include <string>
 
typedef VOID(WINAPI *SendSas)(BOOL asUser);
 
class FileLogOutputter;

class MSWindowsWatchdog
{
  enum class ProcessState
  {
    Idle,
    StartScheduled,
    StartPending,
    StopPending,
    Running
  };
 
public:
  explicit MSWindowsWatchdog(bool foreground, FileLogOutputter &fileLogOutputter);
  ~MSWindowsWatchdog() = default;

  void startAsync();

  void setProcessConfig(const std::string_view &command, bool elevate);

  void stop();

  bool isProcessRunning();
 
private:
  void mainLoop(const void *);

  void outputLoop(const void *);

  HANDLE duplicateProcessToken(HANDLE process, LPSECURITY_ATTRIBUTES security);

  HANDLE getUserToken(LPSECURITY_ATTRIBUTES security, bool elevatedToken);

  void startProcess();

  ProcessState handleStartError(const std::string_view &message = "");

  void initOutputReadPipe();

  void initSasFunc();

  void sasLoop(const void *);

  static std::string processStateToString(ProcessState state);

  static void shutdownExistingProcesses();
 
private:
  bool m_running = true;
  std::unique_ptr<Thread> m_mainThread;
  std::unique_ptr<Thread> m_outputThread;
  std::unique_ptr<Thread> m_sasThread;
  HANDLE m_outputWritePipe = nullptr;
  HANDLE m_outputReadPipe = nullptr;
  bool m_elevateProcess = false;
  MSWindowsSession m_session;
  int m_startFailures = 0;
  FileLogOutputter &m_fileLogOutputter;
  bool m_foreground = false;
  std::wstring m_activeDesktop = {};
  std::unique_ptr<deskflow::platform::MSWindowsProcess> m_process;
  std::optional<double> m_nextStartTime = std::nullopt;
  ProcessState m_processState = ProcessState::Idle;
  std::wstring m_command = {};
  SendSas m_sendSasFunc = nullptr;
  std::mutex m_processStateMutex;
};