lib/Fuzzer/FuzzerExtFunctionsDlsymWin.cpp

   1 //===- FuzzerExtFunctionsDlsymWin.cpp - Interface to external functions ---===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 // Implementation using dynamic loading for Windows.
  10 //===----------------------------------------------------------------------===//
  11 #include "FuzzerDefs.h"
  12 #if LIBFUZZER_WINDOWS
  13
  14 #include "FuzzerExtFunctions.h"
  15 #include "FuzzerIO.h"
  16 #include "Windows.h"
  17
  18 // This must be included after Windows.h.
  19 #include "Psapi.h"
  20
  21 namespace fuzzer {
  22
  23 ExternalFunctions::ExternalFunctions() {
  24   HMODULE Modules[1024];
  25   DWORD BytesNeeded;
  26   HANDLE CurrentProcess = GetCurrentProcess();
  27
  28   if (!EnumProcessModules(CurrentProcess, Modules, sizeof(Modules),
  29                           &BytesNeeded)) {
  30     Printf("EnumProcessModules failed (error: %d).\n", GetLastError());
  31     exit(1);
  32   }
  33
  34   if (sizeof(Modules) < BytesNeeded) {
  35     Printf("Error: the array is not big enough to hold all loaded modules.\n");
  36     exit(1);
  37   }
  38
  39   for (size_t i = 0; i < (BytesNeeded / sizeof(HMODULE)); i++)
  40   {
  41     FARPROC Fn;
  42 #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)                            \
  43     if (this->NAME == nullptr) {                                               \
  44       Fn = GetProcAddress(Modules[i], #NAME);                                  \
  45       if (Fn == nullptr)                                                       \
  46          Fn = GetProcAddress(Modules[i], #NAME "__dll");                       \
  47       this->NAME = (decltype(ExternalFunctions::NAME)) Fn;                     \
  48     }
  49 #include "FuzzerExtFunctions.def"
  50 #undef EXT_FUNC
  51   }
  52
  53 #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)                            \
  54   if (this->NAME == nullptr && WARN)                                           \
  55     Printf("WARNING: Failed to find function \"%s\".\n", #NAME);
  56 #include "FuzzerExtFunctions.def"
  57 #undef EXT_FUNC
  58 }
  59
  60 } // namespace fuzzer
  61
  62 #endif // LIBFUZZER_WINDOWS