155 lines
4 KiB
C++
155 lines
4 KiB
C++
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/*++
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Copyright (c) 2000-2001 Microsoft Corporation
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Module Name:
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HookCallback.cpp
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Abstract:
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Hooking mechanism for callbacks.
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Notes:
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Use the HookCallback mechanism to hook any type of callback
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function, like an application-defined WindowProc. HookCallback
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will register your hook and insert an extra parameter -- pfnOld.
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This will allow you to call the actual callback from your stub
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function. pfnOld is inserted as the first parameter. Do not pass
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pfnOld to the original callback, use the real prototype for the
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callback.
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See the shim DisableW2KOwnerDrawButtonStates for example usage.
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History:
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02/16/2000 markder Created
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08/14/2001 robkenny Moved code inside the ShimLib namespace.
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--*/
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#include <ShimHook.h>
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namespace ShimLib
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{
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#pragma pack(push)
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#pragma pack(1)
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typedef struct _JUMPTABLEENTRY
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{
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BYTE PopEax;
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BYTE PushDword;
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PVOID pfnOld;
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BYTE PushEax;
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BYTE Jmp[2];
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PVOID ppfnNew;
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PVOID pfnNew;
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_JUMPTABLEENTRY* pNextEntry;
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} JUMPTABLEENTRY, *PJUMPTABLEENTRY;
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#pragma pack(pop)
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PJUMPTABLEENTRY g_pCallbackJumpTable = NULL;
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// defines from user.h to tell if a windowproc is actually a handle to a CPD
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#define HMINDEXBITS 0x0000FFFF // bits where index is stored
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#define CPDHANDLE_HI ((ULONG_PTR)~HMINDEXBITS)
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#define ISCPDTAG(x) (((ULONG_PTR)(x) & CPDHANDLE_HI) == CPDHANDLE_HI)
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/*++
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Function Description:
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Registers a callback hook.
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Arguments:
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IN pfnOld - The original callback function address.
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IN pfnNew - The new (stub) callback function address.
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Return Value:
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The address to be passed in as the callback. If you wanted
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to hook the progress routine that is called when you use
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the MoveFileWithProgress API, simply hook the API through the
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normal shim mechanism and then use this function to obtain a new
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address to pass in as lpProgressRoutine.
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History:
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11/01/1999 markder Created
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--*/
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PVOID
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HookCallback(PVOID pfnOld, PVOID pfnNew)
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{
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PJUMPTABLEENTRY pJT = g_pCallbackJumpTable;
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if (pfnOld == NULL)
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{
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// NULL has been passed in. Ignore this call.
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pJT = NULL;
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goto eh;
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}
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if (ISCPDTAG(pfnOld) || IsBadCodePtr((FARPROC)pfnOld))
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{
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// This isn't a normal procedure call, and must be from a system DLL.
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// We should ignore it.
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pJT = (PJUMPTABLEENTRY)pfnOld;
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goto eh;
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}
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// Check to see if we have already made an entry for this pfnOld. If so,
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// just pass back the existing jump table.
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while (pJT != NULL)
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{
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if (pJT->pfnOld == pfnOld)
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break;
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pJT = pJT->pNextEntry;
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}
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if (pJT == NULL)
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{
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// Note that this table is allocated and never freed because
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// the entries will be used right up until the very last message
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// is sent to a window. There is no opportunity for cleanup.
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pJT = (PJUMPTABLEENTRY) HeapAlloc(GetProcessHeap(),
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HEAP_GENERATE_EXCEPTIONS,
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sizeof(JUMPTABLEENTRY) );
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// Fill in assembler. Each hard-coded hex value is the i386
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// opcode for the particular instruction.
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pJT->PopEax = 0x58; // Pop off return address
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pJT->PushDword = 0x68; // Push pfnOld as extra parameter
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pJT->pfnOld = pfnOld;
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pJT->PushEax = 0x50; // Push return address back on
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pJT->Jmp[0] = 0xFF; // Jump to pfnNew
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pJT->Jmp[1] = 0x25;
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pJT->ppfnNew = &(pJT->pfnNew);
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// Fill in data members
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pJT->pfnNew = pfnNew;
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pJT->pNextEntry = g_pCallbackJumpTable;
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// Add to top of list
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g_pCallbackJumpTable = pJT;
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}
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eh:
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DPF("ShimLib", eDbgLevelInfo, "CallbackHook( pfnOld = 0x%08X, pfnNew = 0x%08X ) returned 0x%08X\n", pfnOld, pfnNew, pJT);
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return pJT;
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}
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}; // end of namespace ShimLib
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