WindowsXP/admin/wmi/wbem/xmltransport/compiler/control/xmltransf/classfac.cpp

//***************************************************************************
//
// Copyright (c) 1997-1999 Microsoft Corporation
//
//  CLASSFAC.CPP
//
//  alanbos  13-Feb-98   Created.
//
//  Contains the class factory.  This creates objects when
//  connections are requested.
//
//***************************************************************************
#include <tchar.h>
#include "precomp.h"
#include <map>
#include <vector>
#include <wmiutils.h>
#include <wbemdisp.h>
#include <ocidl.h>
#include "disphlp.h"
#include <objsafe.h>
#include <wbemcli.h>
#include <wbemdisp.h>
#include <XMLTransportClientHelper.h>
#include "classfac.h"
#include "xmltrnsf.h"
#include "privilege.h"
#include "cxmltransf.h"

static HRESULT InitializeWmiXmlTransfDLL ();

//***************************************************************************
//
// CXMLTFactory::CXMLTFactory
//
// DESCRIPTION:
//
// Constructor
//
//***************************************************************************

CXMLTFactory::CXMLTFactory()
{
    m_cRef=0L;
	return;
}

//***************************************************************************
//
// CXMLTFactory::~CXMLTFactory
//
// DESCRIPTION:
//
// Destructor
//
//***************************************************************************

CXMLTFactory::~CXMLTFactory(void)
{
	return;
}

//***************************************************************************
//
// CXMLTFactory::QueryInterface
// CXMLTFactory::AddRef
// CXMLTFactory::Release
//
// Purpose: Standard Ole routines needed for all interfaces
//
//***************************************************************************


STDMETHODIMP CXMLTFactory::QueryInterface(REFIID riid
    , LPVOID *ppv)
{
    *ppv=NULL;

    if (IID_IUnknown==riid || IID_IClassFactory==riid)
        *ppv=this;

    if (NULL!=*ppv)
        {
        ((LPUNKNOWN)*ppv)->AddRef();
        return NOERROR;
        }

    return ResultFromScode(E_NOINTERFACE);
}

STDMETHODIMP_(ULONG) CXMLTFactory::AddRef(void)
{
    long l = InterlockedIncrement(&m_cRef);
    return l;
}

STDMETHODIMP_(ULONG) CXMLTFactory::Release(void)
{
    long l = InterlockedDecrement(&m_cRef);
    if (0L!=l)
        return l;

    delete this;
    return 0L;
}

//***************************************************************************
//
//  SCODE CXMLTFactory::CreateInstance
//
//  Description:
//
//  Instantiates a Translator object returning an interface pointer.
//
//  Parameters:
//
//  pUnkOuter       LPUNKNOWN to the controlling IUnknown if we are
//                  being used in an aggregation.
//  riid            REFIID identifying the interface the caller
//                  desires to have for the new object.
//  ppvObj          PPVOID in which to store the desired
//                  interface pointer for the new object.
//
// Return Value:
//  HRESULT         NOERROR if successful, otherwise E_NOINTERFACE
//                  if we cannot support the requested interface.
//***************************************************************************

STDMETHODIMP CXMLTFactory::CreateInstance (

	IN LPUNKNOWN pUnkOuter,
    IN REFIID riid,
    OUT PPVOID ppvObj
)
{
    IUnknown *pObj = NULL;
    HRESULT hr = E_FAIL;

    *ppvObj=NULL;

    // This object doesnt support aggregation.
    if (NULL!=pUnkOuter)
        return ResultFromScode(CLASS_E_NOAGGREGATION);

	// Set up global variables. 
	if(SUCCEEDED(hr = InitializeWmiXmlTransfDLL()))
	{
		if(pObj = (IWmiXMLTransformer *) new CXMLTransformer)
		{
			if(FAILED(hr = pObj->QueryInterface(riid, ppvObj)))
			{
				//Kill the object if initial creation or Init failed.
				delete pObj;
			}
		}
		else
			hr = ResultFromScode(E_OUTOFMEMORY);;
	}
    return hr;
}

//***************************************************************************
//
//  SCODE CXMLTFactory::LockServer
//
//  Description:
//
//  Increments or decrements the lock count of the DLL.  If the
//  lock count goes to zero and there are no objects, the DLL
//  is allowed to unload.  See DllCanUnloadNow.
//
//  Parameters:
//
//  fLock           BOOL specifying whether to increment or
//                  decrement the lock count.
//
//  Return Value:
//
//  HRESULT         NOERROR always.
//***************************************************************************


STDMETHODIMP CXMLTFactory::LockServer(IN BOOL fLock)
{
    if (fLock)
        InterlockedIncrement((long *)&g_cLock);
    else
        InterlockedDecrement((long *)&g_cLock);

    return NOERROR;
}




//***************************************************************************
//
//  SCODE InitializeWmiXmlTransfDLL
//
//  DESCRIPTION:
//
//  This static function is caused on CreateInstance(); it sets up some global information
// required for security processing.
//
//***************************************************************************
 
HRESULT InitializeWmiXmlTransfDLL ()
{
	HRESULT hr = S_OK;
	EnterCriticalSection (&g_csGlobalInitialization);

	if (!s_bInitialized)
	{
		// Get OS info
		OSVERSIONINFO	osVersionInfo;
		osVersionInfo.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);

		GetVersionEx (&osVersionInfo);
		s_bIsNT = (VER_PLATFORM_WIN32_NT == osVersionInfo.dwPlatformId);
		s_dwNTMajorVersion = osVersionInfo.dwMajorVersion;

		if (s_bIsNT)
		{
			HKEY hKey;

			// Security values are relevant for NT only - for Win9x leave as default
			if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, 
					L"Software\\Microsoft\\Wbem\\XML\\XMLTransformer", 0, KEY_QUERY_VALUE, &hKey))
			{
				DWORD dwDummy = 0;

				// Get revert flag value from registry - NT 4.0 or less only
				if (s_dwNTMajorVersion <= 4)
				{
					DWORD dwEnableForAsp = 0;
					dwDummy = sizeof (dwEnableForAsp);
				
					if (ERROR_SUCCESS == RegQueryValueEx (hKey, L"EnableForASP", 
							NULL, NULL, (BYTE *) &dwEnableForAsp,  &dwDummy))
						s_bCanRevert = (0 != dwEnableForAsp);
				}

				RegCloseKey (hKey);
			}
		}
		if(SUCCEEDED(hr = InitWMIXMLClientLibrary()))
			s_bInitialized = true;
	}
	
	LeaveCriticalSection (&g_csGlobalInitialization);
	return hr;
}