base/win/pe_image.h

   1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file was adapted from GreenBorder's Code.
   6 // To understand what this class is about (for other than well known functions
   7 // as GetProcAddress), a good starting point is "An In-Depth Look into the
   8 // Win32 Portable Executable File Format" by Matt Pietrek:
   9 // http://msdn.microsoft.com/msdnmag/issues/02/02/PE/default.aspx
  10
  11 #ifndef BASE_WIN_PE_IMAGE_H_
  12 #define BASE_WIN_PE_IMAGE_H_
  13
  14 #include <windows.h>
  15
  16 #if defined(_WIN32_WINNT_WIN8)
  17 // The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h.
  18 #undef FACILITY_VISUALCPP
  19 #endif
  20 #include <DelayIMP.h>
  21
  22 namespace base {
  23 namespace win {
  24
  25 // This class is a wrapper for the Portable Executable File Format (PE).
  26 // Its main purpose is to provide an easy way to work with imports and exports
  27 // from a file, mapped in memory as image.
  28 class PEImage {
  29  public:
  30   // Callback to enumerate sections.
  31   // cookie is the value passed to the enumerate method.
  32   // Returns true to continue the enumeration.
  33   typedef bool (*EnumSectionsFunction)(const PEImage &image,
  34                                        PIMAGE_SECTION_HEADER header,
  35                                        PVOID section_start, DWORD section_size,
  36                                        PVOID cookie);
  37
  38   // Callback to enumerate exports.
  39   // function is the actual address of the symbol. If forward is not null, it
  40   // contains the dll and symbol to forward this export to. cookie is the value
  41   // passed to the enumerate method.
  42   // Returns true to continue the enumeration.
  43   typedef bool (*EnumExportsFunction)(const PEImage &image, DWORD ordinal,
  44                                       DWORD hint, LPCSTR name, PVOID function,
  45                                       LPCSTR forward, PVOID cookie);
  46
  47   // Callback to enumerate import blocks.
  48   // name_table and iat point to the imports name table and address table for
  49   // this block. cookie is the value passed to the enumerate method.
  50   // Returns true to continue the enumeration.
  51   typedef bool (*EnumImportChunksFunction)(const PEImage &image, LPCSTR module,
  52                                            PIMAGE_THUNK_DATA name_table,
  53                                            PIMAGE_THUNK_DATA iat, PVOID cookie);
  54
  55   // Callback to enumerate imports.
  56   // module is the dll that exports this symbol. cookie is the value passed to
  57   // the enumerate method.
  58   // Returns true to continue the enumeration.
  59   typedef bool (*EnumImportsFunction)(const PEImage &image, LPCSTR module,
  60                                       DWORD ordinal, LPCSTR name, DWORD hint,
  61                                       PIMAGE_THUNK_DATA iat, PVOID cookie);
  62
  63   // Callback to enumerate dalayed import blocks.
  64   // module is the dll that exports this block of symbols. cookie is the value
  65   // passed to the enumerate method.
  66   // Returns true to continue the enumeration.
  67   typedef bool (*EnumDelayImportChunksFunction)(const PEImage &image,
  68                                                 PImgDelayDescr delay_descriptor,
  69                                                 LPCSTR module,
  70                                                 PIMAGE_THUNK_DATA name_table,
  71                                                 PIMAGE_THUNK_DATA iat,
  72                                                 PIMAGE_THUNK_DATA bound_iat,
  73                                                 PIMAGE_THUNK_DATA unload_iat,
  74                                                 PVOID cookie);
  75
  76   // Callback to enumerate relocations.
  77   // cookie is the value passed to the enumerate method.
  78   // Returns true to continue the enumeration.
  79   typedef bool (*EnumRelocsFunction)(const PEImage &image, WORD type,
  80                                      PVOID address, PVOID cookie);
  81
  82   explicit PEImage(HMODULE module) : module_(module) {}
  83   explicit PEImage(const void* module) {
  84     module_ = reinterpret_cast<HMODULE>(const_cast<void*>(module));
  85   }
  86
  87   virtual ~PEImage() {}
  88
  89   // Gets the HMODULE for this object.
  90   HMODULE module() const;
  91
  92   // Sets this object's HMODULE.
  93   void set_module(HMODULE module);
  94
  95   // Checks if this symbol is actually an ordinal.
  96   static bool IsOrdinal(LPCSTR name);
  97
  98   // Converts a named symbol to the corresponding ordinal.
  99   static WORD ToOrdinal(LPCSTR name);
 100
 101   // Returns the DOS_HEADER for this PE.
 102   PIMAGE_DOS_HEADER GetDosHeader() const;
 103
 104   // Returns the NT_HEADER for this PE.
 105   PIMAGE_NT_HEADERS GetNTHeaders() const;
 106
 107   // Returns number of sections of this PE.
 108   WORD GetNumSections() const;
 109
 110   // Returns the header for a given section.
 111   // returns NULL if there is no such section.
 112   PIMAGE_SECTION_HEADER GetSectionHeader(UINT section) const;
 113
 114   // Returns the size of a given directory entry.
 115   DWORD GetImageDirectoryEntrySize(UINT directory) const;
 116
 117   // Returns the address of a given directory entry.
 118   PVOID GetImageDirectoryEntryAddr(UINT directory) const;
 119
 120   // Returns the section header for a given address.
 121   // Use: s = image.GetImageSectionFromAddr(a);
 122   // Post: 's' is the section header of the section that contains 'a'
 123   //       or NULL if there is no such section.
 124   PIMAGE_SECTION_HEADER GetImageSectionFromAddr(PVOID address) const;
 125
 126   // Returns the section header for a given section.
 127   PIMAGE_SECTION_HEADER GetImageSectionHeaderByName(LPCSTR section_name) const;
 128
 129   // Returns the first block of imports.
 130   PIMAGE_IMPORT_DESCRIPTOR GetFirstImportChunk() const;
 131
 132   // Returns the exports directory.
 133   PIMAGE_EXPORT_DIRECTORY GetExportDirectory() const;
 134
 135   // Returns a given export entry.
 136   // Use: e = image.GetExportEntry(f);
 137   // Pre: 'f' is either a zero terminated string or ordinal
 138   // Post: 'e' is a pointer to the export directory entry
 139   //       that contains 'f's export RVA, or NULL if 'f'
 140   //       is not exported from this image
 141   PDWORD GetExportEntry(LPCSTR name) const;
 142
 143   // Returns the address for a given exported symbol.
 144   // Use: p = image.GetProcAddress(f);
 145   // Pre: 'f' is either a zero terminated string or ordinal.
 146   // Post: if 'f' is a non-forwarded export from image, 'p' is
 147   //       the exported function. If 'f' is a forwarded export
 148   //       then p is the special value 0xFFFFFFFF. In this case
 149   //       RVAToAddr(*GetExportEntry) can be used to resolve
 150   //       the string that describes the forward.
 151   FARPROC GetProcAddress(LPCSTR function_name) const;
 152
 153   // Retrieves the ordinal for a given exported symbol.
 154   // Returns true if the symbol was found.
 155   bool GetProcOrdinal(LPCSTR function_name, WORD *ordinal) const;
 156
 157   // Enumerates PE sections.
 158   // cookie is a generic cookie to pass to the callback.
 159   // Returns true on success.
 160   bool EnumSections(EnumSectionsFunction callback, PVOID cookie) const;
 161
 162   // Enumerates PE exports.
 163   // cookie is a generic cookie to pass to the callback.
 164   // Returns true on success.
 165   bool EnumExports(EnumExportsFunction callback, PVOID cookie) const;
 166
 167   // Enumerates PE imports.
 168   // cookie is a generic cookie to pass to the callback.
 169   // Returns true on success.
 170   bool EnumAllImports(EnumImportsFunction callback, PVOID cookie) const;
 171
 172   // Enumerates PE import blocks.
 173   // cookie is a generic cookie to pass to the callback.
 174   // Returns true on success.
 175   bool EnumImportChunks(EnumImportChunksFunction callback, PVOID cookie) const;
 176
 177   // Enumerates the imports from a single PE import block.
 178   // cookie is a generic cookie to pass to the callback.
 179   // Returns true on success.
 180   bool EnumOneImportChunk(EnumImportsFunction callback, LPCSTR module_name,
 181                           PIMAGE_THUNK_DATA name_table, PIMAGE_THUNK_DATA iat,
 182                           PVOID cookie) const;
 183
 184
 185   // Enumerates PE delay imports.
 186   // cookie is a generic cookie to pass to the callback.
 187   // Returns true on success.
 188   bool EnumAllDelayImports(EnumImportsFunction callback, PVOID cookie) const;
 189
 190   // Enumerates PE delay import blocks.
 191   // cookie is a generic cookie to pass to the callback.
 192   // Returns true on success.
 193   bool EnumDelayImportChunks(EnumDelayImportChunksFunction callback,
 194                              PVOID cookie) const;
 195
 196   // Enumerates imports from a single PE delay import block.
 197   // cookie is a generic cookie to pass to the callback.
 198   // Returns true on success.
 199   bool EnumOneDelayImportChunk(EnumImportsFunction callback,
 200                                PImgDelayDescr delay_descriptor,
 201                                LPCSTR module_name,
 202                                PIMAGE_THUNK_DATA name_table,
 203                                PIMAGE_THUNK_DATA iat,
 204                                PIMAGE_THUNK_DATA bound_iat,
 205                                PIMAGE_THUNK_DATA unload_iat,
 206                                PVOID cookie) const;
 207
 208   // Enumerates PE relocation entries.
 209   // cookie is a generic cookie to pass to the callback.
 210   // Returns true on success.
 211   bool EnumRelocs(EnumRelocsFunction callback, PVOID cookie) const;
 212
 213   // Verifies the magic values on the PE file.
 214   // Returns true if all values are correct.
 215   bool VerifyMagic() const;
 216
 217   // Converts an rva value to the appropriate address.
 218   virtual PVOID RVAToAddr(DWORD rva) const;
 219
 220   // Converts an rva value to an offset on disk.
 221   // Returns true on success.
 222   bool ImageRVAToOnDiskOffset(DWORD rva, DWORD *on_disk_offset) const;
 223
 224   // Converts an address to an offset on disk.
 225   // Returns true on success.
 226   bool ImageAddrToOnDiskOffset(LPVOID address, DWORD *on_disk_offset) const;
 227
 228  private:
 229   HMODULE module_;
 230 };
 231
 232 // This class is an extension to the PEImage class that allows working with PE
 233 // files mapped as data instead of as image file.
 234 class PEImageAsData : public PEImage {
 235  public:
 236   explicit PEImageAsData(HMODULE hModule) : PEImage(hModule) {}
 237
 238   virtual PVOID RVAToAddr(DWORD rva) const;
 239 };
 240
 241 inline bool PEImage::IsOrdinal(LPCSTR name) {
 242 #pragma warning(push)
 243 #pragma warning(disable: 4311)
 244   // This cast generates a warning because it is 32 bit specific.
 245   return reinterpret_cast<DWORD>(name) <= 0xFFFF;
 246 #pragma warning(pop)
 247 }
 248
 249 inline WORD PEImage::ToOrdinal(LPCSTR name) {
 250   return reinterpret_cast<WORD>(name);
 251 }
 252
 253 inline HMODULE PEImage::module() const {
 254   return module_;
 255 }
 256
 257 inline PIMAGE_IMPORT_DESCRIPTOR PEImage::GetFirstImportChunk() const {
 258   return reinterpret_cast<PIMAGE_IMPORT_DESCRIPTOR>(
 259              GetImageDirectoryEntryAddr(IMAGE_DIRECTORY_ENTRY_IMPORT));
 260 }
 261
 262 inline PIMAGE_EXPORT_DIRECTORY PEImage::GetExportDirectory() const {
 263   return reinterpret_cast<PIMAGE_EXPORT_DIRECTORY>(
 264              GetImageDirectoryEntryAddr(IMAGE_DIRECTORY_ENTRY_EXPORT));
 265 }
 266
 267 }  // namespace win
 268 }  // namespace base
 269
 270 #endif  // BASE_WIN_PE_IMAGE_H_