Receiving Device Event Notification in Windows Service(Detecting Hardware Insertion and/or Removal in Service)

// DevService.cpp : Implementation of WinMain


// Note: Proxy/Stub Information
//      To build a separate proxy/stub DLL, 
//      run nmake -f DevServiceps.mk in the project directory.

#include "stdafx.h"
#include "resource.h"
#include <initguid.h>
#include "DevService.h"
#include <dbt.h>
#include "DevService_i.c"


#include <stdio.h>

CServiceModule _Module;

BEGIN_OBJECT_MAP(ObjectMap)
END_OBJECT_MAP()

unsigned long __stdcall DeviceEventNotify(DWORD evtype, PVOID evdata);
HDEVNOTIFY DoRegisterDeviceInterface(SERVICE_STATUS_HANDLE hServiceStatus);
DEFINE_GUID(GUID_CLASS_STORAGE_VOLUME, 0x53F5630DL, 0xB6BF, 0x11D0, 0x94, 0xF2, \
					0x00, 0xA0, 0xC9, 0x1E, 0xFB, 0x8B);

#define DEVICE_NOTIFY_ALL_INTERFACE_CLASSES  0x00000004


LPCTSTR FindOneOf(LPCTSTR p1, LPCTSTR p2)
{
    while (p1 != NULL && *p1 != NULL)
    {
        LPCTSTR p = p2;
        while (p != NULL && *p != NULL)
        {
            if (*p1 == *p)
                return CharNext(p1);
            p = CharNext(p);
        }
        p1 = CharNext(p1);
    }
    return NULL;
}

// Although some of these functions are big they are declared inline since they are only used once

inline HRESULT CServiceModule::RegisterServer(BOOL bRegTypeLib, BOOL bService)
{
    HRESULT hr = CoInitialize(NULL);
    if (FAILED(hr))
        return hr;

    // Remove any previous service since it may point to
    // the incorrect file
    Uninstall();

    // Add service entries
    UpdateRegistryFromResource(IDR_DevService, TRUE);

    // Adjust the AppID for Local Server or Service
    CRegKey keyAppID;
    LONG lRes = keyAppID.Open(HKEY_CLASSES_ROOT, _T("AppID"), KEY_WRITE);
    if (lRes != ERROR_SUCCESS)
        return lRes;

    CRegKey key;
    lRes = key.Open(keyAppID, _T("{F3DAB762-BD38-4821-8806-26646BE0BDAC}"), KEY_WRITE);
    if (lRes != ERROR_SUCCESS)
        return lRes;
    key.DeleteValue(_T("LocalService"));
    
    if (bService)
    {
        key.SetValue(_T("DevService"), _T("LocalService"));
        key.SetValue(_T("-Service"), _T("ServiceParameters"));
        // Create service
        Install();
    }

    // Add object entries
    hr = CComModule::RegisterServer(bRegTypeLib);

    CoUninitialize();
    return hr;
}

inline HRESULT CServiceModule::UnregisterServer()
{
    HRESULT hr = CoInitialize(NULL);
    if (FAILED(hr))
        return hr;

    // Remove service entries
    UpdateRegistryFromResource(IDR_DevService, FALSE);
    // Remove service
    Uninstall();
    // Remove object entries
    CComModule::UnregisterServer(TRUE);
    CoUninitialize();
    return S_OK;
}


inline void CServiceModule::Init(_ATL_OBJMAP_ENTRY* p, HINSTANCE h, UINT nServiceNameID, const GUID* plibid)
{


    CComModule::Init(p, h, plibid);

    m_bService = TRUE;

    LoadString(h, nServiceNameID, m_szServiceName, sizeof(m_szServiceName) / sizeof(TCHAR));

    // set up the initial service status 
    m_hServiceStatus = NULL;
    m_status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    m_status.dwCurrentState = SERVICE_STOPPED;
    m_status.dwControlsAccepted = SERVICE_ACCEPT_STOP;
    m_status.dwWin32ExitCode = 0;
    m_status.dwServiceSpecificExitCode = 0;
    m_status.dwCheckPoint = 0;
    m_status.dwWaitHint = 0;

}

LONG CServiceModule::Unlock()
{
    LONG l = CComModule::Unlock();
    if (l == 0 && !m_bService)
        PostThreadMessage(dwThreadID, WM_QUIT, 0, 0);
    return l;
}

BOOL CServiceModule::IsInstalled()
{
    BOOL bResult = FALSE;

    SC_HANDLE hSCM = ::OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);

    if (hSCM != NULL)
    {
        SC_HANDLE hService = ::OpenService(hSCM, m_szServiceName, SERVICE_QUERY_CONFIG);
        if (hService != NULL)
        {
            bResult = TRUE;
            ::CloseServiceHandle(hService);
        }
        ::CloseServiceHandle(hSCM);
    }
    return bResult;
}

inline BOOL CServiceModule::Install()
{
    if (IsInstalled())
        return TRUE;

    SC_HANDLE hSCM = ::OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
    if (hSCM == NULL)
    {
        MessageBox(NULL, _T("Couldn't open service manager"), m_szServiceName, MB_OK);
        return FALSE;
    }

    // Get the executable file path
    TCHAR szFilePath[_MAX_PATH];
    ::GetModuleFileName(NULL, szFilePath, _MAX_PATH);

    SC_HANDLE hService = ::CreateService(
        hSCM, m_szServiceName, m_szServiceName,
        SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS,
        SERVICE_DEMAND_START, SERVICE_ERROR_NORMAL,
        szFilePath, NULL, NULL, _T("RPCSS\0"), NULL, NULL);

    if (hService == NULL)
    {
        ::CloseServiceHandle(hSCM);
        MessageBox(NULL, _T("Couldn't create service"), m_szServiceName, MB_OK);
        return FALSE;
    }

    ::CloseServiceHandle(hService);
    ::CloseServiceHandle(hSCM);
    return TRUE;
}

inline BOOL CServiceModule::Uninstall()
{
    if (!IsInstalled())
        return TRUE;

    SC_HANDLE hSCM = ::OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);

    if (hSCM == NULL)
    {
        MessageBox(NULL, _T("Couldn't open service manager"), m_szServiceName, MB_OK);
        return FALSE;
    }

    SC_HANDLE hService = ::OpenService(hSCM, m_szServiceName, SERVICE_STOP | DELETE);

    if (hService == NULL)
    {
        ::CloseServiceHandle(hSCM);
        MessageBox(NULL, _T("Couldn't open service"), m_szServiceName, MB_OK);
        return FALSE;
    }
    SERVICE_STATUS status;
    ::ControlService(hService, SERVICE_CONTROL_STOP, &status);

    BOOL bDelete = ::DeleteService(hService);
    ::CloseServiceHandle(hService);
    ::CloseServiceHandle(hSCM);

    if (bDelete)
        return TRUE;

    MessageBox(NULL, _T("Service could not be deleted"), m_szServiceName, MB_OK);
    return FALSE;
}

///////////////////////////////////////////////////////////////////////////////////////
// Logging functions
void CServiceModule::LogEvent(LPCTSTR pFormat, ...)
{
    TCHAR    chMsg[256];
    HANDLE  hEventSource;
    LPTSTR  lpszStrings[1];
    va_list pArg;

    va_start(pArg, pFormat);
    _vstprintf(chMsg, pFormat, pArg);
    va_end(pArg);

    lpszStrings[0] = chMsg;

    if (m_bService)
    {
        /* Get a handle to use with ReportEvent(). */
        hEventSource = RegisterEventSource(NULL, m_szServiceName);
        if (hEventSource != NULL)
        {
            /* Write to event log. */
            ReportEvent(hEventSource, EVENTLOG_INFORMATION_TYPE, 0, 0, NULL, 1, 0, (LPCTSTR*) &lpszStrings[0], NULL);
            DeregisterEventSource(hEventSource);
        }
    }
    else
    {
        // As we are not running as a service, just write the error to the console.
        _putts(chMsg);
    }
}

//////////////////////////////////////////////////////////////////////////////////////////////
// Service startup and registration
inline void CServiceModule::Start()
{
    SERVICE_TABLE_ENTRY st[] =
    {
        { m_szServiceName, _ServiceMain },
        { NULL, NULL }
    };
    if (m_bService && !::StartServiceCtrlDispatcher(st))
    {
        m_bService = FALSE;
    }

    if (m_bService == FALSE)
        Run();
}

inline void CServiceModule::ServiceMain(DWORD /* dwArgc */, LPTSTR* /* lpszArgv */)
{
    // Register the control request handler
    m_status.dwCurrentState = SERVICE_START_PENDING;
    m_hServiceStatus = RegisterServiceCtrlHandlerEx(m_szServiceName, (LPHANDLER_FUNCTION_EX)_Handler,0);
    if (m_hServiceStatus == NULL)
    {
        LogEvent(_T("Handler not installed"));
        return;
    }

	m_status.dwWin32ExitCode = S_OK;
    m_status.dwCheckPoint = 0;
    m_status.dwWaitHint = 0;

    SetServiceStatus(SERVICE_START_PENDING);

    m_status.dwWin32ExitCode = S_OK;
    m_status.dwCheckPoint = 0;
    m_status.dwWaitHint = 0;

	DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;

    ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );
    NotificationFilter.dbcc_size = 
        sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
	memcpy( &(NotificationFilter.dbcc_classguid),
   			&(GUID_DEVINTERFACE_CDROM),
   			sizeof(struct _GUID));
	m_hDevNotify = RegisterDeviceNotification(m_hServiceStatus, 
    &NotificationFilter,
    DEVICE_NOTIFY_SERVICE_HANDLE|DEVICE_NOTIFY_ALL_INTERFACE_CLASSES);


    // When the Run function returns, the service has stopped.
    Run();

    SetServiceStatus(SERVICE_STOPPED);
    LogEvent(_T("Service stopped"));
}

inline void CServiceModule::Handler(DWORD dwOpcode,DWORD evtype, PVOID evdata, PVOID Context)
{
    switch (dwOpcode)
    {
    case SERVICE_CONTROL_STOP:
		OutputDebugString("SERVICE_CONTROL_STOP");
		UnregisterDeviceNotification(m_hDevNotify);
        SetServiceStatus(SERVICE_STOP_PENDING);
        PostThreadMessage(dwThreadID, WM_QUIT, 0, 0);
        break;
    case SERVICE_CONTROL_PAUSE:
        break;
    case SERVICE_CONTROL_CONTINUE:
        break;
    case SERVICE_CONTROL_INTERROGATE:
        break;
    case SERVICE_CONTROL_SHUTDOWN:
        break;
	case SERVICE_CONTROL_DEVICEEVENT:
		OutputDebugString("SERVICE_CONTROL_DEVICEEVENT");
		DeviceEventNotify(evtype, evdata);
		break;
    default:
        LogEvent(_T("Bad service request"));
    }
}

void WINAPI CServiceModule::_ServiceMain(DWORD dwArgc, LPTSTR* lpszArgv)
{
    _Module.ServiceMain(dwArgc, lpszArgv);
}
void WINAPI CServiceModule::_Handler(DWORD dwOpcode,DWORD evtype, PVOID evdata, PVOID Context)
{
    _Module.Handler(dwOpcode,evtype,evdata,Context); 
}

void CServiceModule::SetServiceStatus(DWORD dwState)
{
    m_status.dwCurrentState  = dwState;
    ::SetServiceStatus(m_hServiceStatus, &m_status);

}

void CServiceModule::Run()
{
    _Module.dwThreadID = GetCurrentThreadId();

    HRESULT hr = CoInitialize(NULL);
//  If you are running on NT 4.0 or higher you can use the following call
//  instead to make the EXE free threaded.
//  This means that calls come in on a random RPC thread
//  HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);

    _ASSERTE(SUCCEEDED(hr));

    // This provides a NULL DACL which will allow access to everyone.
    CSecurityDescriptor sd;
    sd.InitializeFromThreadToken();
    hr = CoInitializeSecurity(sd, -1, NULL, NULL,
        RPC_C_AUTHN_LEVEL_PKT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL);
    _ASSERTE(SUCCEEDED(hr));

    hr = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER, REGCLS_MULTIPLEUSE);
    _ASSERTE(SUCCEEDED(hr));

    LogEvent(_T("Service started"));
    if (m_bService)
        SetServiceStatus(SERVICE_RUNNING);

    MSG msg;
    while (GetMessage(&msg, 0, 0, 0))
        DispatchMessage(&msg);

    _Module.RevokeClassObjects();

    CoUninitialize();
}

/////////////////////////////////////////////////////////////////////////////
//
extern "C" int WINAPI _tWinMain(HINSTANCE hInstance, 
    HINSTANCE /*hPrevInstance*/, LPTSTR lpCmdLine, int /*nShowCmd*/)
{
    lpCmdLine = GetCommandLine(); //this line necessary for _ATL_MIN_CRT
    _Module.Init(ObjectMap, hInstance, IDS_SERVICENAME, &LIBID_DEVSERVICELib);
    _Module.m_bService = TRUE;

    TCHAR szTokens[] = _T("-/");

    LPCTSTR lpszToken = FindOneOf(lpCmdLine, szTokens);
    while (lpszToken != NULL)
    {
        if (lstrcmpi(lpszToken, _T("UnregServer"))==0)
            return _Module.UnregisterServer();

        // Register as Local Server
        if (lstrcmpi(lpszToken, _T("RegServer"))==0)
            return _Module.RegisterServer(TRUE, FALSE);
        
        // Register as Service
        if (lstrcmpi(lpszToken, _T("Service"))==0)
            return _Module.RegisterServer(TRUE, TRUE);
        
        lpszToken = FindOneOf(lpszToken, szTokens);
    }

    // Are we Service or Local Server
    CRegKey keyAppID;
    LONG lRes = keyAppID.Open(HKEY_CLASSES_ROOT, _T("AppID"), KEY_READ);
    if (lRes != ERROR_SUCCESS)
        return lRes;

    CRegKey key;
    lRes = key.Open(keyAppID, _T("{F3DAB762-BD38-4821-8806-26646BE0BDAC}"), KEY_READ);
    if (lRes != ERROR_SUCCESS)
        return lRes;

    TCHAR szValue[_MAX_PATH];
    DWORD dwLen = _MAX_PATH;
    lRes = key.QueryValue(szValue, _T("LocalService"), &dwLen);

    _Module.m_bService = FALSE;
    if (lRes == ERROR_SUCCESS)
        _Module.m_bService = TRUE;

    _Module.Start();

    // When we get here, the service has been stopped
    return _Module.m_status.dwWin32ExitCode;
}

unsigned long __stdcall DeviceEventNotify(DWORD evtype, PVOID evdata)
{

	switch (evtype)
	{
		case DBT_DEVICEREMOVECOMPLETE:
		{
			_Module.LogEvent(TEXT("Device Removal"));
			OutputDebugString("Device Removal");
		}
		break;
		case DBT_DEVICEARRIVAL:
		{
			_Module.LogEvent(TEXT("Device Arrival"));
			OutputDebugString("Device Arrival");
		}
		break;
	}

	return 0;
}