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// |
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// DelayHlp.cpp |
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// |
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// Copyright (c) Microsoft Corporation. All rights reserved. |
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// |
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// Implement the delay load helper routines. |
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// |
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// Build instructions |
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// cl -c -O1 -Z7 -Zl -W3 delayhlp.cpp |
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// |
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// For ISOLATION_AWARE_ENABLED calls to LoadLibrary(), you will need to add |
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// a definition for ISOLATION_AWARE_ENABLED to the command line above, eg: |
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// cl -c -O1 -Z7 -Zl -W3 -DISOLATION_AWARE_ENABLED=1 delayhlp.cpp |
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// |
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// |
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// Then, you can either link directly with this new object file, or replace the one in |
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// delayimp.lib with your new one, eg: |
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// lib /out:delayimp.lib delayhlp.obj |
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// |
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#define WIN32_LEAN_AND_MEAN |
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#define STRICT |
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#include <windows.h> |
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#include "DelayImp.h" |
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// |
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// Local copies of strlen, memcmp, and memcpy to make sure we do not need the CRT |
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// |
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static inline size_t |
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__strlen(const char * sz) { |
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const char *szEnd = sz; |
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while( *szEnd++ ) { |
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; |
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} |
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return szEnd - sz - 1; |
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} |
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static inline int |
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__memcmp(const void * pv1, const void * pv2, size_t cb) { |
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if (!cb) { |
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return 0; |
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} |
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while ( --cb && *(char *)pv1 == *(char *)pv2 ) { |
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pv1 = (char *)pv1 + 1; |
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pv2 = (char *)pv2 + 1; |
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} |
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return *((unsigned char *)pv1) - *((unsigned char *)pv2); |
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} |
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static inline void * |
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__memcpy(void * pvDst, const void * pvSrc, size_t cb) { |
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void * pvRet = pvDst; |
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// |
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// copy from lower addresses to higher addresses |
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// |
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while (cb--) { |
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*(char *)pvDst = *(char *)pvSrc; |
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pvDst = (char *)pvDst + 1; |
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pvSrc = (char *)pvSrc + 1; |
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} |
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return pvRet; |
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} |
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// utility function for calculating the index of the current import |
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// for all the tables (INT, BIAT, UIAT, and IAT). |
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inline unsigned |
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IndexFromPImgThunkData(PCImgThunkData pitdCur, PCImgThunkData pitdBase) { |
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return (unsigned) (pitdCur - pitdBase); |
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} |
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// C++ template utility function for converting RVAs to pointers |
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// |
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#if defined(_M_IA64) |
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#pragma section(".base", long, read) |
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extern "C" |
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__declspec(allocate(".base")) |
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const IMAGE_DOS_HEADER __ImageBase; |
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#else |
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extern "C" |
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const IMAGE_DOS_HEADER __ImageBase; |
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#endif |
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template <class X> |
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X PFromRva(RVA rva) { |
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return X(PBYTE(&__ImageBase) + rva); |
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} |
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// structure definitions for the list of unload records |
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typedef struct UnloadInfo * PUnloadInfo; |
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typedef struct UnloadInfo { |
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PUnloadInfo puiNext; |
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PCImgDelayDescr pidd; |
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} UnloadInfo; |
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// utility function for calculating the count of imports given the base |
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// of the IAT. NB: this only works on a valid IAT! |
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inline unsigned |
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CountOfImports(PCImgThunkData pitdBase) { |
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unsigned cRet = 0; |
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PCImgThunkData pitd = pitdBase; |
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while (pitd->u1.Function) { |
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pitd++; |
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cRet++; |
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} |
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return cRet; |
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} |
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extern "C" |
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PUnloadInfo __puiHead = 0; |
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struct ULI : public UnloadInfo { |
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ULI(PCImgDelayDescr pidd_) { |
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pidd = pidd_; |
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Link(); |
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} |
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~ULI() { |
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Unlink(); |
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} |
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void * |
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operator new(size_t cb) { |
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return ::LocalAlloc(LPTR, cb); |
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} |
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void |
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operator delete(void * pv) { |
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::LocalFree(pv); |
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} |
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void |
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Unlink() { |
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PUnloadInfo * ppui = &__puiHead; |
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while (*ppui && *ppui != this) { |
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ppui = &((*ppui)->puiNext); |
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} |
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if (*ppui == this) { |
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*ppui = puiNext; |
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} |
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} |
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void |
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Link() { |
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puiNext = __puiHead; |
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__puiHead = this; |
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} |
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}; |
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// For our own internal use, we convert to the old |
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// format for convenience. |
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// |
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struct InternalImgDelayDescr { |
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DWORD grAttrs; // attributes |
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LPCSTR szName; // pointer to dll name |
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HMODULE * phmod; // address of module handle |
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PImgThunkData pIAT; // address of the IAT |
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PCImgThunkData pINT; // address of the INT |
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PCImgThunkData pBoundIAT; // address of the optional bound IAT |
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PCImgThunkData pUnloadIAT; // address of optional copy of original IAT |
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DWORD dwTimeStamp; // 0 if not bound, |
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// O.W. date/time stamp of DLL bound to (Old BIND) |
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}; |
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typedef InternalImgDelayDescr * PIIDD; |
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typedef const InternalImgDelayDescr * PCIIDD; |
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static inline |
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PIMAGE_NT_HEADERS WINAPI |
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PinhFromImageBase(HMODULE hmod) { |
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return PIMAGE_NT_HEADERS(PBYTE(hmod) + PIMAGE_DOS_HEADER(hmod)->e_lfanew); |
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} |
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static inline |
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void WINAPI |
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OverlayIAT(PImgThunkData pitdDst, PCImgThunkData pitdSrc) { |
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__memcpy(pitdDst, pitdSrc, CountOfImports(pitdDst) * sizeof IMAGE_THUNK_DATA); |
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} |
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static inline |
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DWORD WINAPI |
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TimeStampOfImage(PIMAGE_NT_HEADERS pinh) { |
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return pinh->FileHeader.TimeDateStamp; |
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} |
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static inline |
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bool WINAPI |
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FLoadedAtPreferredAddress(PIMAGE_NT_HEADERS pinh, HMODULE hmod) { |
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return UINT_PTR(hmod) == pinh->OptionalHeader.ImageBase; |
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} |
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// Do the InterlockedExchange magic |
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// |
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#ifdef _M_IX86 |
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#undef InterlockedExchangePointer |
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#define InterlockedExchangePointer(Target, Value) \ |
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(PVOID)(LONG_PTR)InterlockedExchange((PLONG)(Target), (LONG)(LONG_PTR)(Value)) |
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#if (_MSC_VER >= 1300) |
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typedef __w64 unsigned long *PULONG_PTR; |
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#else |
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typedef unsigned long *PULONG_PTR; |
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#endif |
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#endif |
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extern "C" |
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FARPROC WINAPI |
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__delayLoadHelper2( |
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PCImgDelayDescr pidd, |
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FARPROC * ppfnIATEntry |
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) { |
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// Set up some data we use for the hook procs but also useful for |
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// our own use |
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// |
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InternalImgDelayDescr idd = { |
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pidd->grAttrs, |
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PFromRva<LPCSTR>(pidd->rvaDLLName), |
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PFromRva<HMODULE*>(pidd->rvaHmod), |
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PFromRva<PImgThunkData>(pidd->rvaIAT), |
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PFromRva<PCImgThunkData>(pidd->rvaINT), |
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PFromRva<PCImgThunkData>(pidd->rvaBoundIAT), |
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PFromRva<PCImgThunkData>(pidd->rvaUnloadIAT), |
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pidd->dwTimeStamp |
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}; |
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DelayLoadInfo dli = { |
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sizeof DelayLoadInfo, |
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pidd, |
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ppfnIATEntry, |
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idd.szName, |
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{ 0 }, |
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0, |
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0, |
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0 |
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}; |
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if (0 == (idd.grAttrs & dlattrRva)) { |
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PDelayLoadInfo rgpdli[1] = { &dli }; |
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RaiseException( |
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VcppException(ERROR_SEVERITY_ERROR, ERROR_INVALID_PARAMETER), |
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0, |
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1, |
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PULONG_PTR(rgpdli) |
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); |
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return 0; |
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} |
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if (pinh->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT].Size) { |
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PCImgDelayDescr pidd; |
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pidd = PFromRva<PCImgDelayDescr>( |
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pinh->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT].VirtualAddress |
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); |
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// Check all of the dlls listed up to the NULL one. |
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// |
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while (pidd->rvaDLLName) { |
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// Check to see if it is the DLL we want to load. |
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// Intentionally case sensitive to avoid complication of using the CRT |
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// for those that don't use the CRT...the user can replace this with |
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// a variant of a case insenstive comparison routine. |
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// |
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LPCSTR szDllCur = PFromRva<LPCSTR>(pidd->rvaDLLName); |
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size_t cchDllCur = __strlen(szDllCur); |
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if (cchDllCur == __strlen(szDll) && __memcmp(szDll, szDllCur, cchDllCur) == 0) { |
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// We found it, so break out with pidd and szDllCur set appropriately |
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// |
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break; |
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} |
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// Advance to the next delay import descriptor |
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// |
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pidd++; |
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} |
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if (pidd->rvaDLLName) { |
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// Found a matching DLL name, now process it. |
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// |
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// Set up the internal structure |
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// |
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FARPROC * ppfnIATEntry = PFromRva<FARPROC*>(pidd->rvaIAT); |
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size_t cpfnIATEntries = CountOfImports(PCImgThunkData(ppfnIATEntry)); |
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FARPROC * ppfnIATEntryMax = ppfnIATEntry + cpfnIATEntries; |
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for (;ppfnIATEntry < ppfnIATEntryMax; ppfnIATEntry++) { |
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__delayLoadHelper2(pidd, ppfnIATEntry); |
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} |
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// Done, indicate some semblance of success |
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// |
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hrRet = S_OK; |
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} |
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} |
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return hrRet; |
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} |
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