PVOID

HookBlockFunc(

                          PNDIS_OPEN_BLOCK pFirstOpenBlock,

                          DWORD dwFunctionCode,

                          PVOID pfuncNew,

                          DWORD dwNdisVersion)

{

        RECEIVE_HANDLER * pReceiveHandler = NULL;

        RECEIVE_PACKET_HANDLER * pReceivePacketHandler = NULL;

//      PVOID pFuncHandler = NULL;

        PVOID pOldFunc = NULL;

        PNDIS_OPEN_BLOCK pOpenBlock = pFirstOpenBlock;

        if(!pFirstOpenBlock)

                return NULL;

        if(!pfuncNew )

                return NULL;

        switch(dwFunctionCode)

        {

        case PROTO_RECEIVE_HANDLER:

                //travel all NDIS_OPEN_BLOCK

                for(;pOpenBlock;pOpenBlock = GetNextBlock( pOpenBlock,dwNdisVersi

on ))

                {

                        pReceiveHandler = GetReceiveHandler(pOpenBlock,dwNdisVers

ion);

                        //Just hook once!

                        if( *pReceiveHandler != pfuncNew )

                        {

                                pOldFunc = *pReceiveHandler;

                                *pReceiveHandler = pfuncNew;

                        }

                        if(dwNdisVersion == 0x00040001)//win2k ????

                        {

                                pReceiveHandler = GetPostNt31ReceiveHandler(pOpen

Block,dwNdisVersion);

                                if( *pReceiveHandler != pfuncNew )

                                {

                                        pOldFunc = *pReceiveHandler;

                                        *pReceiveHandler = pfuncNew;

                                }

                        }

                }

                break;

        case PROTO_RECEIVE_PACKET_HANDLER:

                //travel all NDIS_OPEN_BLOCK

                for(;pOpenBlock;pOpenBlock = GetNextBlock( pOpenBlock,dwNdisVersi

on ))

                        pReceivePacketHandler = GetReceivePacketHandler( pOpenBlo

ck,dwNdisVersion

 );

                        //Just hook once !

                        if(*pReceivePacketHandler != pfuncNew)

                        {

                                pOldFunc = *pReceivePacketHandler;

                                *pReceivePacketHandler = pfuncNew;

                        }

                }

                break;

        default:

                break;

        }

        return pOldFunc;

}