// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file was adapted from GreenBorder's Code.
// To understand what this class is about (for other than well known functions
// as GetProcAddress), a good starting point is "An In-Depth Look into the
// Win32 Portable Executable File Format" by Matt Pietrek:
// http://msdn.microsoft.com/msdnmag/issues/02/02/PE/default.aspx
#ifndef BASE_WIN_PE_IMAGE_H_
#define BASE_WIN_PE_IMAGE_H_
#include <windows.h>
#include <delayimp.h>
#include <stdint.h>
namespace base {
namespace win {
// This class is a wrapper for the Portable Executable File Format (PE).
// Its main purpose is to provide an easy way to work with imports and exports
// from a file, mapped in memory as image. A PEImage object is constructed from
// a loaded PE file by passing the HMODULE to the constructor. Loading a PE file
// as an image will execute code and should only be done with trusted images.
// Parsing of untrusted PE files is better done with PeImageReader.
// PEImage can only parse PE files that match the bitness of the process.
// See also PEImageAsData.
class PEImage {
public:
// Callback to enumerate sections.
// cookie is the value passed to the enumerate method.
// Returns true to continue the enumeration.
using EnumSectionsFunction =
bool (*)(const PEImage&, PIMAGE_SECTION_HEADER, PVOID, DWORD, PVOID);
// Callback to enumerate exports.
// function is the actual address of the symbol. If forward is not null, it
// contains the dll and symbol to forward this export to. cookie is the value
// passed to the enumerate method.
// Returns true to continue the enumeration.
using EnumExportsFunction =
bool (*)(const PEImage&, DWORD, DWORD, LPCSTR, PVOID, LPCSTR, PVOID);
// Callback to enumerate import blocks.
// name_table and iat point to the imports name table and address table for
// this block. cookie is the value passed to the enumerate method.
// Returns true to continue the enumeration.
using EnumImportChunksFunction = bool (*)(const PEImage&,
LPCSTR,
PIMAGE_THUNK_DATA,
PIMAGE_THUNK_DATA,
PVOID);
// Callback to enumerate imports.
// module is the dll that exports this symbol. cookie is the value passed to
// the enumerate method.
// Returns true to continue the enumeration.
using EnumImportsFunction = bool (*)(const PEImage&,
LPCSTR,
DWORD,
LPCSTR,
DWORD,
PIMAGE_THUNK_DATA,
PVOID);
// Callback to enumerate delayed import blocks.
// module is the dll that exports this block of symbols. cookie is the value
// passed to the enumerate method.
// Returns true to continue the enumeration.
using EnumDelayImportChunksFunction = bool (*)(const PEImage&,
PImgDelayDescr,
LPCSTR,
PIMAGE_THUNK_DATA,
PIMAGE_THUNK_DATA,
PVOID);
// Callback to enumerate relocations.
// cookie is the value passed to the enumerate method.
// Returns true to continue the enumeration.
using EnumRelocsFunction = bool (*)(const PEImage&, WORD, PVOID, PVOID);
explicit PEImage(HMODULE module) : module_(module) {}
explicit PEImage(const void* module) {
module_ = reinterpret_cast<HMODULE>(const_cast<void*>(module));
}
virtual ~PEImage() = default;
// Gets the HMODULE for this object.
HMODULE module() const;
// Sets this object's HMODULE.
void set_module(HMODULE module);
// Checks if this symbol is actually an ordinal.
static bool IsOrdinal(LPCSTR name);
// Converts a named symbol to the corresponding ordinal.
static WORD ToOrdinal(LPCSTR name);
// Returns the DOS_HEADER for this PE.
PIMAGE_DOS_HEADER GetDosHeader() const;
// Returns the NT_HEADER for this PE.
PIMAGE_NT_HEADERS GetNTHeaders() const;
// Returns number of sections of this PE.
WORD GetNumSections() const;
// Returns the header for a given section.
// returns NULL if there is no such section.
PIMAGE_SECTION_HEADER GetSectionHeader(WORD section) const;
// Returns the size of a given directory entry or 0 if |directory| is out of
// bounds.
DWORD GetImageDirectoryEntrySize(UINT directory) const;
// Returns the address of a given directory entry or NULL if |directory| is
// out of bounds.
PVOID GetImageDirectoryEntryAddr(UINT directory) const;
// Returns the section header for a given address.
// Use: s = image.GetImageSectionFromAddr(a);
// Post: 's' is the section header of the section that contains 'a'
// or NULL if there is no such section.
PIMAGE_SECTION_HEADER GetImageSectionFromAddr(PVOID address) const;
// Returns the section header for a given section.
PIMAGE_SECTION_HEADER GetImageSectionHeaderByName(LPCSTR section_name) const;
// Returns the first block of imports.
PIMAGE_IMPORT_DESCRIPTOR GetFirstImportChunk() const;
// Returns the exports directory.
PIMAGE_EXPORT_DIRECTORY GetExportDirectory() const;
// Retrieves the contents of the image's CodeView debug entry, returning true
// if such an entry is found and is within a section mapped into the current
// process's memory. |guid|, |age|, and |pdb_filename| are each optional and
// may be NULL. |pdb_filename_length| is mandatory if |pdb_filename| is not
// NULL, as the latter is populated with a direct reference to a string in the
// image that is is not guaranteed to be terminated (note: informal
// documentation indicates that it should be terminated, but the data is
// untrusted). Furthermore, owing to its nature of being a string in the
// image, it is only valid while the image is mapped into the process, and the
// caller is not responsible for freeing it. |pdb_filename_length| is
// populated with the string length of |pdb_filename| (not including a
// terminator) and must be used rather than relying on |pdb_filename| being
// properly terminated.
bool GetDebugId(LPGUID guid,
LPDWORD age,
LPCSTR* pdb_filename,
size_t* pdb_filename_length) const;
// Returns a given export entry.
// Use: e = image.GetExportEntry(f);
// Pre: 'f' is either a zero terminated string or ordinal
// Post: 'e' is a pointer to the export directory entry
// that contains 'f's export RVA, or NULL if 'f'
// is not exported from this image
PDWORD GetExportEntry(LPCSTR name) const;
// Returns the address for a given exported symbol.
// Use: p = image.GetProcAddress(f);
// Pre: 'f' is either a zero terminated string or ordinal.
// Post: if 'f' is a non-forwarded export from image, 'p' is
// the exported function. If 'f' is a forwarded export
// then p is the special value -1. In this case
// RVAToAddr(*GetExportEntry) can be used to resolve
// the string that describes the forward.
FARPROC GetProcAddress(LPCSTR function_name) const;
// Retrieves the ordinal for a given exported symbol.
// Returns true if the symbol was found.
bool GetProcOrdinal(LPCSTR function_name, WORD* ordinal) const;
// Enumerates PE sections.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
bool EnumSections(EnumSectionsFunction callback, PVOID cookie) const;
// Enumerates PE exports.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
bool EnumExports(EnumExportsFunction callback, PVOID cookie) const;
// Enumerates PE imports.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
// Use |target_module_name| to ensure the callback is only invoked for the
// specified module.
bool EnumAllImports(EnumImportsFunction callback,
PVOID cookie,
LPCSTR target_module_name) const;
// Enumerates PE import blocks.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
// Use |target_module_name| to ensure the callback is only invoked for the
// specified module.
bool EnumImportChunks(EnumImportChunksFunction callback,
PVOID cookie,
LPCSTR target_module_name) const;
// Enumerates the imports from a single PE import block.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
bool EnumOneImportChunk(EnumImportsFunction callback,
LPCSTR module_name,
PIMAGE_THUNK_DATA name_table,
PIMAGE_THUNK_DATA iat,
PVOID cookie) const;
// Enumerates PE delay imports.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
// Use |target_module_name| to ensure the callback is only invoked for the
// specified module. If this parameter is non-null then all delayloaded
// imports are resolved when the target module is found.
bool EnumAllDelayImports(EnumImportsFunction callback,
PVOID cookie,
LPCSTR target_module_name) const;
// Enumerates PE delay import blocks.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
// Use |target_module_name| to ensure the callback is only invoked for the
// specified module. If this parameter is non-null then all delayloaded
// imports are resolved when the target module is found.
bool EnumDelayImportChunks(EnumDelayImportChunksFunction callback,
PVOID cookie,
LPCSTR target_module_name) const;
// Enumerates imports from a single PE delay import block.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
bool EnumOneDelayImportChunk(EnumImportsFunction callback,
PImgDelayDescr delay_descriptor,
LPCSTR module_name,
PIMAGE_THUNK_DATA name_table,
PIMAGE_THUNK_DATA iat,
PVOID cookie) const;
// Enumerates PE relocation entries.
// cookie is a generic cookie to pass to the callback.
// Returns true on success.
bool EnumRelocs(EnumRelocsFunction callback, PVOID cookie) const;
// Verifies the magic values on the PE file.
// Returns true if all values are correct.
bool VerifyMagic() const;
// Converts an rva value to the appropriate address.
virtual PVOID RVAToAddr(uintptr_t rva) const;
// Converts an rva value to an offset on disk.
// Returns true on success.
bool ImageRVAToOnDiskOffset(uintptr_t rva, DWORD* on_disk_offset) const;
// Converts an address to an offset on disk.
// Returns true on success.
bool ImageAddrToOnDiskOffset(LPVOID address, DWORD* on_disk_offset) const;
private:
// Returns a pointer to a data directory, or NULL if |directory| is out of
// range.
const IMAGE_DATA_DIRECTORY* GetDataDirectory(UINT directory) const;
HMODULE module_;
};
// This class is an extension to the PEImage class that allows working with PE
// files mapped as data instead of as image file.
class PEImageAsData : public PEImage {
public:
explicit PEImageAsData(HMODULE hModule) : PEImage(hModule) {}
PVOID RVAToAddr(uintptr_t rva) const override;
};
inline bool PEImage::IsOrdinal(LPCSTR name) {
return reinterpret_cast<uintptr_t>(name) <= 0xFFFF;
}
inline WORD PEImage::ToOrdinal(LPCSTR name) {
return static_cast<WORD>(reinterpret_cast<intptr_t>(name));
}
inline HMODULE PEImage::module() const {
return module_;
}
inline PIMAGE_IMPORT_DESCRIPTOR PEImage::GetFirstImportChunk() const {
return reinterpret_cast<PIMAGE_IMPORT_DESCRIPTOR>(
GetImageDirectoryEntryAddr(IMAGE_DIRECTORY_ENTRY_IMPORT));
}
inline PIMAGE_EXPORT_DIRECTORY PEImage::GetExportDirectory() const {
return reinterpret_cast<PIMAGE_EXPORT_DIRECTORY>(
GetImageDirectoryEntryAddr(IMAGE_DIRECTORY_ENTRY_EXPORT));
}
} // namespace win
} // namespace base
#endif // BASE_WIN_PE_IMAGE_H_
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