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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #define WINAPI
  5. using LPCSTR = const char*;
  6. using BOOL = int;
  7. using DWORD = unsigned int;
  8. using LPVOID = void*;
  9. constexpr BOOL TRUE = 1;
  10. constexpr BOOL FALSE = 0;
  11.  
  12. BOOL WINAPI GetFileVersionInfo_dummy(LPCSTR, DWORD, DWORD, LPVOID) { return TRUE; }
  13.  
  14. void* WINAPI LoadLibraryA(LPCSTR) { return reinterpret_cast<void*>(1); }
  15. void* WINAPI GetProcAddress(void*, LPCSTR) { return (void*) &GetFileVersionInfo_dummy; }
  16.  
  17. template <typename RetType, typename... ArgTypes>
  18. struct proxyTraits
  19. {
  20.     using funcType = RetType (WINAPI *)(ArgTypes...);
  21.     using proxyType = RetType (*)(ArgTypes...);
  22. };
  23.  
  24. template <typename RetType, typename... ArgTypes>
  25. auto proxyFunction(
  26. 	LPCSTR dllPath,
  27. 	LPCSTR functionName,
  28.     RetType (*proxy)(ArgTypes...))
  29. {
  30.     using funcType = typename proxyTraits<RetType, ArgTypes...>::funcType;
  31.     funcType funcPtr = (funcType) GetProcAddress(LoadLibraryA(dllPath), functionName);
  32.  
  33.     if (funcPtr)
  34.         std::cout << "Proxy success" << std::endl;
  35.     else
  36.         std::cout << "Proxy fail" << std::endl;
  37.  
  38.     return funcPtr;
  39. }
  40.  
  41. BOOL GetFileVersionInfoProxy(LPCSTR lptstrFilename, DWORD dwHandle, DWORD dwLen, LPVOID lpData)
  42. {
  43.     auto getFileVersion = proxyFunction("C:\\Windows\\System32\\Version.dll", "GetFileVersionInfoA", &GetFileVersionInfoProxy);
  44.     if (getFileVersion)
  45.         return getFileVersion(lptstrFilename, dwHandle, dwLen, lpData);
  46.  
  47.     return FALSE;
  48. }
  49.  
  50. int main()
  51. {
  52.     GetFileVersionInfoProxy("filename", 0, 0, nullptr);
  53. 	return 0;
  54. }
Success #stdin #stdout 0s 4408KB
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stdin
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Standard input is empty
stdout
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Proxy success
https://ideone.com/X5quqm
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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