//***************************************************************************
//
//  MAINDLL.CPP
// 
//  Module: WBEM Framework Instance provider 
//
//  Purpose: Contains DLL entry points.  Also has code that controls
//           when the DLL can be unloaded by tracking the number of
//           objects and locks as well as routines that support
//           self registration.
//
//  Copyright (c)1998 Microsoft Corporation, All Rights Reserved
//
//***************************************************************************
#include <stdafx.h>

HMODULE ghModule;
//============

WCHAR *GUIDSTRING = L"{C9839D99-2345-11d2-A334-00C04F86DB06}";
CLSID CLSID_DHCP_SERVER;

//Count number of objects and number of locks.

long       g_cLock=0;


//***************************************************************************
//
//  DllGetClassObject
//
//  Purpose: Called by Ole when some client wants a class factory.  Return 
//           one only if it is the sort of class this DLL supports.
//
//***************************************************************************


STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, PPVOID ppv)
{
    HRESULT hr;
    CWbemGlueFactory *pObj;

	CLSIDFromString(GUIDSTRING, &CLSID_DHCP_SERVER);
    if (CLSID_DHCP_SERVER!=rclsid)
        return E_FAIL;

    pObj=new CWbemGlueFactory();

    if (NULL==pObj)
        return E_OUTOFMEMORY;

    hr=pObj->QueryInterface(riid, ppv);

    if (FAILED(hr))
        delete pObj;

    return hr;
}

//***************************************************************************
//
// DllCanUnloadNow
//
// Purpose: Called periodically by Ole in order to determine if the
//          DLL can be freed.
//
// Return:  S_OK if there are no objects in use and the class factory 
//          isn't locked.
//
//***************************************************************************

STDAPI DllCanUnloadNow(void)
{
    SCODE   sc;

    // It is OK to unload if there are no objects or locks on the 
    // class factory and the framework is done with you.
    
    if ((0L==g_cLock) && CWbemProviderGlue::FrameworkLogoffDLL("DHCP_SERVER"))
	{
		sc = S_OK;
	}
	else
	{
		sc = S_FALSE;
	}
    return sc;
}

//***************************************************************************
//
//  Is4OrMore
//
//  Returns true if win95 or any version of NT > 3.51
//
//***************************************************************************

BOOL Is4OrMore(void)
{
    OSVERSIONINFO os;
    os.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    if(!GetVersionEx(&os))
        return FALSE;           // should never happen
    return os.dwMajorVersion >= 4;
}

//***************************************************************************
//
// DllRegisterServer
//
// Purpose: Called during setup or by regsvr32.
//
// Return:  NOERROR if registration successful, error otherwise.
//***************************************************************************

STDAPI DllRegisterServer(void)
{   
    char       szID[128];
    WCHAR      wcID[128];
    char       szCLSID[128];
    char       szModule[MAX_PATH];
    char * pName = "";
    char * pModel;
    HKEY hKey1, hKey2;



    // TO DO: Using 'Both' is preferable.  The framework is designed and written to support
    // free threaded code.  If you will be writing free-threaded code, uncomment these 
    // three lines.

//    if(Is4OrMore())
//        pModel = "Both";
//    else
        pModel = "Apartment";

    // Create the path.

	CLSIDFromString(GUIDSTRING, &CLSID_DHCP_SERVER);
    StringFromGUID2(CLSID_DHCP_SERVER, wcID, 128);
    wcstombs(szID, wcID, 128);
    lstrcpy(szCLSID, TEXT("SOFTWARE\\CLASSES\\CLSID\\"));
    lstrcat(szCLSID, szID);

    // Create entries under CLSID

    RegCreateKey(HKEY_LOCAL_MACHINE, szCLSID, &hKey1);
    RegSetValueEx(hKey1, NULL, 0, REG_SZ, (BYTE *)pName, lstrlen(pName)+1);
    RegCreateKey(hKey1,"InprocServer32",&hKey2);

    GetModuleFileName(ghModule, szModule,  MAX_PATH);
    RegSetValueEx(hKey2, NULL, 0, REG_SZ, (BYTE *)szModule, 
                                        lstrlen(szModule)+1);
    RegSetValueEx(hKey2, "ThreadingModel", 0, REG_SZ, 
                                        (BYTE *)pModel, lstrlen(pModel)+1);
    CloseHandle(hKey1);
    CloseHandle(hKey2);
    return NOERROR;
}

//***************************************************************************
//
// DllUnregisterServer
//
// Purpose: Called when it is time to remove the registry entries.
//
// Return:  NOERROR if registration successful, error otherwise.
//***************************************************************************

STDAPI DllUnregisterServer(void)
{
    char       szID[128];
    WCHAR      wcID[128];
    char  szCLSID[128];
    HKEY hKey;

    // Create the path using the CLSID

	CLSIDFromString(GUIDSTRING, &CLSID_DHCP_SERVER);
    StringFromGUID2(CLSID_DHCP_SERVER, wcID, 128);
    wcstombs(szID, wcID, 128);
    lstrcpy(szCLSID, TEXT("SOFTWARE\\CLASSES\\CLSID\\"));
    lstrcat(szCLSID, szID);

    // First delete the InProcServer subkey.

    DWORD dwRet = RegOpenKey(HKEY_LOCAL_MACHINE, szCLSID, &hKey);
    if(dwRet == NO_ERROR)
    {
        RegDeleteKey(hKey, "InProcServer32");
        CloseHandle(hKey);
    }

    dwRet = RegOpenKey(HKEY_LOCAL_MACHINE, TEXT("SOFTWARE\\CLASSES\\CLSID\\"), &hKey);
    if(dwRet == NO_ERROR)
    {
        RegDeleteKey(hKey,szID);
        CloseHandle(hKey);
    }

    return NOERROR;
}

BOOL WINAPI DllMain (	HINSTANCE hInstDLL,	// handle to dll module
						DWORD fdwReason,	// reason for calling function
						LPVOID lpReserved	)	// reserved
{
    BOOL bRet = TRUE;
	
	// Perform actions based on the reason for calling.
    switch( fdwReason ) 
    { 
        case DLL_PROCESS_ATTACH:
         // Initialize once for each new process.
         // Return FALSE to fail DLL load.
            ghModule = hInstDLL;
            bRet = CWbemProviderGlue::FrameworkLoginDLL("DHCP_SERVER");
            break;

        case DLL_THREAD_ATTACH:
         // Do thread-specific initialization.
            break;

        case DLL_THREAD_DETACH:
         // Do thread-specific cleanup.
            break;

        case DLL_PROCESS_DETACH:
         // Perform any necessary cleanup.
            break;
    }

    return bRet;  // Sstatus of DLL_PROCESS_ATTACH.
}