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title "Dynamic Linkages to RPCRT4.DLL";++;; Copyright (c) 1989 Microsoft Corporation;; Module Name:;; rpccall.asm;; Abstract:;; This module implements functions that dynamically link to; RPCRT4.DLL.;; Author:;; Murthy Srinivas 7-Nov-1995;; Environment:;; Any mode.;; Revision History:;; Notes:;; This module is dependent on the internal structure of the; COleStaticMutexSem object (g_Rpcrt4Sem). It invokes the; COleCommonMutexSem::Request method, as well as invokes; COleStaticMutexSem::ReleaseFn. Any changes to this object; may impact this code -- BEWARE!;;--.386p .xlistinclude callconv.inc .list
extrn _GetLastError@0:proc extrn _GetProcAddress@8:proc extrn _LoadLibraryA@4:proc extrn _FreeLibrary@4:proc extrn ?Request@COleStaticMutexSem@@QAEXXZ:proc ; COleStaticMutexSem::Request extrn ?g_Rpcrt4Sem@@3VCOleStaticMutexSem@@A:DWORD ; COleStaticMutexSem g_Rpcrt4Sem extrn ?ReleaseFn@COleStaticMutexSem@@QAEXXZ:proc ; COleStaticMutexSem::ReleaseFn
_BSS SEGMENT DWORD PUBLIC 'BSS'_BSS ENDS
CONST SEGMENT DWORD PUBLIC 'CONST'CONST ENDS
_TEXT SEGMENT DWORD PUBLIC 'CODE' ASSUME DS:FLAT, ES:NOTHING, SS:NOTHING, FS:NOTHING, GS:NOTHING_TEXT ENDS
_DATA SEGMENT DWORD PUBLIC 'DATA' ASSUME DS:FLAT, ES:NOTHING, SS:NOTHING, FS:NOTHING, GS:NOTHING_DATA ENDS
EPBlock STRUCEPAddr DD ?Nameptr DD ?ErrRtn DD ?EPBlock ENDS
;; Macro to define an RPC entry point that is to be dynamically; linked-to;
RPC_ENTRY macro EntryPoint,N
_DATA SEGMENTEntryPoint&Block EPBlock {LoadAndGo,EntryPoint&Name,EntryPoint&Err}_DATA ENDS
CONST SEGMENTEntryPoint&Name DB '&EntryPoint',0CONST ENDS
_TEXT SEGMENT
align dword ;;ifb <N> PUBLICP <_&EntryPoint> stdProc <_&EntryPoint>,0,<> ;;else PUBLICP <_&EntryPoint>,N stdProc <_&EntryPoint>,N,<> ;;endif lea eax,EntryPoint&Block ;; ptr to block for EP jmp DWORD PTR [eax].EPBlock.EPAddr ;; first time will jump to ;; LoadAndGo. Subsequently ;; will jump to EP in RPCRT4EntryPoint&Err: ;; stdRET <_&EntryPoint> ;; stdENDP <_&EntryPoint> ;;
_TEXT ENDS
endm
RPC_VAR_ENTRY macro EntryPoint
_DATA SEGMENTEntryPoint&Block EPBlock {LoadAndGo,EntryPoint&Name,EntryPoint&Err}_DATA ENDS
CONST SEGMENTEntryPoint&Name DB '&EntryPoint',0CONST ENDS
_TEXT SEGMENT
align dword ;; public _&EntryPoint ;;_&EntryPoint proc ;; lea eax,EntryPoint&Block ;; ptr to block for EP jmp DWORD PTR [eax].EPBlock.EPAddr ;; first time will jump to ;; LoadAndGo. Subsequently ;; will jump to EP in RPCRT4EntryPoint&Err: ;; ret ;;_&EntryPoint endp ;;
_TEXT ENDS
endm
page subttl "Load RPCRT4 Entry Point And Jump";++;; VOID; LoadAndGo ();; Routine Description:;; This function dynamically loads and saves the entry point address; from RPCRT4.DLL and then jumps to the routine.;; Arguments:;; AX - ptr to EPBlock structure;; Return Value:;; Whatever the designated routine returns.;;--
_BSS SEGMENThLibrary DD 1_BSS ENDS
_DATA SEGMENTLoadOrGet DD LoadLib_DATA ENDS
CONST SEGMENTRPCRT4 DB 'RPCRT4.DLL',0CONST ENDS
_TEXT SEGMENT
LoadAndGo: push ebx ; save ebx, ecx, edx push ecx ; push edx ; push eax ; save EPBlock address mov ecx, OFFSET FLAT:?g_Rpcrt4Sem@@3VCOleStaticMutexSem@@A ; g_Rpcrt4Sem call ?Request@COleStaticMutexSem@@QAEXXZ ; COleStaticMutexSem::Request jmp DWORD PTR LoadOrGet ; LoadLib or GetProc
LoadLib: lea eax,RPCRT4 ; load rpcrt4.dll push eax call _LoadLibraryA@4 or eax,eax ; successful? jnz LoadLibOK ; mov ecx, OFFSET FLAT:?g_Rpcrt4Sem@@3VCOleStaticMutexSem@@A ; g_Rpcrt4Sem call ?ReleaseFn@COleStaticMutexSem@@QAEXXZ ; COleStaticMutexSem::ReleaseFn jmp GotError ;LoadLibOK: mov hLibrary,eax ; save its module handle lea eax,GetProc ; next time we won't LoadLib mov LoadOrGet,eax ;
GetProc: mov ecx, OFFSET FLAT:?g_Rpcrt4Sem@@3VCOleStaticMutexSem@@A ; g_Rpcrt4Sem call ?ReleaseFn@COleStaticMutexSem@@QAEXXZ ; COleStaticMutexSem::ReleaseFn pop eax ; restore EPBlock address push eax ; save EPBlock address push [eax].EPBlock.NamePtr ; routine name push hLibrary ; call _GetProcAddress@8 ; load routine address or eax,eax ; successful? jz GotError ; pop ebx ; restore EPBlock Address mov [ebx].EPBlock.EPAddr,eax ; save routine address in designated location pop edx ; restore EDX, ECX, EBX pop ecx ; pop ebx ; jmp eax ; and jump to the routine in rpcrt4.dll
GotError: call _GetLastError@0 ; for debugging only pop eax ; restore EPBlock address pop edx ; pop ecx ; pop ebx ; push [eax].EPBlock.ErrRtn ; set up error return mov eax,8 ; error return ERROR_NOT_ENOUGH_MEMORY ret ;_TEXT ENDS
_TEXT SEGMENT
align dword
PUBLICP _FreeRPCRT4 ; stdProc _FreeRPCRT4,0,<> ; mov ecx, OFFSET FLAT:?g_Rpcrt4Sem@@3VCOleStaticMutexSem@@A ; g_Rpcrt4Sem call ?Request@COleStaticMutexSem@@QAEXXZ ; COleStaticMutexSem::Request push hLibrary ; FreeLibrary call _FreeLibrary@4 ; lea eax,GotError ; Always return error mov LoadOrGet,eax ; mov ecx, OFFSET FLAT:?g_Rpcrt4Sem@@3VCOleStaticMutexSem@@A ; g_Rpcrt4Sem call ?ReleaseFn@COleStaticMutexSem@@QAEXXZ ; COleStaticMutexSem::ReleaseFn stdRET _FreeRPCRT4 ; stdENDP _FreeRPCRT4 ;
_TEXT ENDS
;; Intercepted Entry points;
RPC_ENTRY CStdStubBuffer_AddRef,1RPC_ENTRY CStdStubBuffer_Connect,2RPC_ENTRY CStdStubBuffer_CountRefs,1RPC_ENTRY CStdStubBuffer_DebugServerQueryInterface,2RPC_ENTRY CStdStubBuffer_DebugServerRelease,2RPC_ENTRY CStdStubBuffer_Disconnect,1RPC_ENTRY CStdStubBuffer_Invoke,3RPC_ENTRY CStdStubBuffer_IsIIDSupported,2RPC_ENTRY CStdStubBuffer_QueryInterface,3RPC_ENTRY IUnknown_AddRef_Proxy,1RPC_ENTRY IUnknown_QueryInterface_Proxy,3RPC_ENTRY IUnknown_Release_Proxy,1RPC_ENTRY I_RpcAllocate,1RPC_ENTRY I_RpcBindingInqTransportType,2RPC_ENTRY I_RpcBindingSetAsync,3RPC_ENTRY I_RpcFree,1RPC_ENTRY I_RpcFreeBuffer,1RPC_ENTRY I_RpcGetBuffer,1RPC_ENTRY I_RpcGetThreadWindowHandle,1RPC_ENTRY I_RpcSendReceive,1RPC_ENTRY I_RpcServerRegisterForwardFunction,1RPC_ENTRY I_RpcServerStartListening,1RPC_ENTRY I_RpcServerStopListening,0RPC_ENTRY I_RpcServerUnregisterEndpointW,2RPC_ENTRY I_RpcSetThreadParams,3RPC_ENTRY I_RpcSsDontSerializeContextRPC_ENTRY I_RpcWindowProc,4RPC_ENTRY NdrAllocate,2RPC_ENTRY NDRCContextBinding,1RPC_ENTRY NDRSContextUnmarshall,2RPC_ENTRY NdrClearOutParameters,3RPC_ENTRY NdrCStdStubBuffer_Release,2RPC_VAR_ENTRY NdrClientCall2RPC_ENTRY NdrClientContextMarshall,3RPC_ENTRY NdrClientContextUnmarshall,3RPC_ENTRY NdrClientInitializeNew,4RPC_ENTRY NdrComplexArrayBufferSize,3RPC_ENTRY NdrComplexArrayFree,3RPC_ENTRY NdrComplexArrayMarshall,3RPC_ENTRY NdrComplexArrayUnmarshall,4RPC_ENTRY NdrConformantStringBufferSize,3RPC_ENTRY NdrConformantStringMarshall,3RPC_ENTRY NdrConformantStringUnmarshall,4RPC_ENTRY NdrConformantStructBufferSize,3RPC_ENTRY NdrConformantStructMarshall,3RPC_ENTRY NdrConformantStructUnmarshall,4RPC_ENTRY NdrConformantVaryingArrayBufferSize,3RPC_ENTRY NdrConformantVaryingArrayMarshall,3RPC_ENTRY NdrConvert,2RPC_ENTRY NdrConvert2,3RPC_ENTRY NdrCStdStubBuffer2_Release,2RPC_ENTRY NdrDllCanUnloadNow,1RPC_ENTRY NdrDllGetClassObject,6RPC_ENTRY NdrDllRegisterProxy,3RPC_ENTRY NdrDllUnregisterProxy,3RPC_ENTRY NdrFreeBuffer,1RPC_ENTRY NdrFullPointerXlatFree,1RPC_ENTRY NdrFullPointerXlatInit,2RPC_ENTRY NdrGetBuffer,3RPC_ENTRY NdrMapCommAndFaultStatus,4RPC_ENTRY NdrOleAllocate,1RPC_ENTRY NdrOleFree,1RPC_ENTRY NdrPointerBufferSize,3RPC_ENTRY NdrPointerFree,3RPC_ENTRY NdrPointerMarshall,3RPC_ENTRY NdrPointerUnmarshall,4RPC_ENTRY NdrProxyErrorHandler,1RPC_ENTRY NdrProxyFreeBuffer,2RPC_ENTRY NdrProxyGetBuffer,2RPC_ENTRY NdrProxyInitialize,5RPC_ENTRY NdrProxySendReceive,2RPC_ENTRY NdrSendReceive,2RPC_ENTRY NdrServerCall2,1RPC_ENTRY NdrServerContextMarshall,3RPC_ENTRY NdrServerContextUnmarshall,1RPC_ENTRY NdrServerInitializeNew,3RPC_ENTRY NdrSimpleStructBufferSize,3RPC_ENTRY NdrSimpleStructMarshall,3RPC_ENTRY NdrSimpleStructUnmarshall,4RPC_ENTRY NdrStubCall2,4RPC_ENTRY NdrStubGetBuffer,3RPC_ENTRY NdrStubInitialize,4RPC_ENTRY RpcBindingCopy,2RPC_ENTRY RpcBindingFree,1RPC_ENTRY RpcBindingFromStringBindingA,2RPC_ENTRY RpcBindingFromStringBindingW,2RPC_ENTRY RpcBindingInqAuthClientA,6RPC_ENTRY RpcBindingInqAuthClientW,6RPC_ENTRY RpcBindingInqAuthInfoExW,8RPC_ENTRY RpcBindingInqAuthInfoW,6RPC_ENTRY RpcBindingInqObject,2RPC_ENTRY RpcBindingReset,1RPC_ENTRY RpcBindingSetAuthInfoA,6RPC_ENTRY RpcBindingSetAuthInfoExW,7RPC_ENTRY RpcBindingSetAuthInfoW,6RPC_ENTRY RpcBindingSetObject,2RPC_ENTRY RpcBindingToStringBindingW,2RPC_ENTRY RpcBindingVectorFree,1RPC_ENTRY RpcImpersonateClient,1RPC_ENTRY RpcMgmtInqComTimeout,2RPC_ENTRY RpcMgmtIsServerListening,1RPC_ENTRY RpcMgmtStopServerListening,1RPC_ENTRY RpcMgmtWaitServerListenRPC_ENTRY RpcNetworkIsProtseqValidW,1RPC_ENTRY RpcRaiseException,1RPC_ENTRY RpcRevertToSelfRPC_ENTRY RpcServerInqBindings,1RPC_ENTRY RpcServerInqDefaultPrincNameA,2RPC_ENTRY RpcServerInqDefaultPrincNameW,2RPC_ENTRY RpcServerListen,3RPC_ENTRY RpcServerRegisterAuthInfoW,4RPC_ENTRY RpcServerRegisterAuthInfoA,4RPC_ENTRY RpcServerRegisterIf,3RPC_ENTRY RpcServerRegisterIfEx,6RPC_ENTRY RpcServerUnregisterIf,3RPC_ENTRY RpcServerUseProtseqEpW,4RPC_ENTRY RpcServerUseProtseqW,3RPC_ENTRY RpcSmDestroyClientContext,1RPC_ENTRY RpcStringBindingComposeW,6RPC_ENTRY RpcStringBindingParseW,6RPC_ENTRY RpcStringFreeW,1RPC_ENTRY RpcStringFreeA,1RPC_ENTRY TowerExplode,6RPC_ENTRY UuidCreate,1RPC_ENTRY MesHandleFree,1RPC_ENTRY MesEncodeFixedBufferHandleCreate,4RPC_ENTRY MesBufferHandleReset,6RPC_ENTRY MesDecodeBufferHandleCreate,3RPC_ENTRY NdrMesTypeAlignSize,4RPC_ENTRY NdrMesTypeEncode,4RPC_ENTRY NdrMesTypeDecode,4
end
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