libpe is a lightweight and very fast library for parsing PE32(x86) and PE32+(x64) binaries, implemented as a C++20 module.
- Works with both PE32(x86) and PE32+(x64) binaries
- Obtains all PE32/PE32+ data structures:
- MSDOS Header
- «Rich» Header
- NT/File/Optional Headers
- Data Directories
- Sections
- Export Table
- Import Table
- Resource Table
- Exceptions Table
- Security Table
- Relocations Table
- Debug Table
- TLS Table
- Load Config Directory
- Bound Import Table
- Delay Import Table
- COM Table
Pepper is one of the apps that is built on top of the libpe.
import libpe;
int main() {
libpe::Clibpe pe(L"C:\\myFile.exe"); //or pe.OpenFile(L"C:\\myFile.exe");
const auto peImp = pe.GetImport();
if(peImp) {
...
}
...
}auto OpenFile(const wchar_t* pwszFile)->int;Opens a file for further processing, until CloseFile is called or Clibpe object goes out of scope and file closes automatically in destructor.
libpe::Clibpe pe;
if(pe.OpenFile(L"C:\\MyFile.exe") == PEOK) {
...
}void CloseFile();Explicitly closes file that was previously opened with the OpenFile(const wchar_t*). This method is invoked automatically in Clibpe destructor.
[[nodiscard]] auto GetDOSHeader()const->std::optional<IMAGE_DOS_HEADER>;Returns a file's standard MSDOS header.
[[nodiscard]] auto GetRichHeader()const->std::optional<PERICHHDR_VEC>;Returns an array of the unofficial and undocumented so called «Rich» structures.
struct PERICHHDR {
DWORD dwOffset; //File's raw offset of the entry.
WORD wId; //Entry Id.
WORD wVersion; //Entry version.
DWORD dwCount; //Amount of occurrences.
};
using PERICHHDR_VEC = std::vector<PERICHHDR>;[[nodiscard]] auto GetNTHeader()const->std::optional<PENTHDR>;Returns a file's NT header.
struct PENTHDR {
DWORD dwOffset; //File's raw offset of the header.
union UNPENTHDR { //Union of either x86 or x64 NT header.
IMAGE_NT_HEADERS32 stNTHdr32; //x86 Header.
IMAGE_NT_HEADERS64 stNTHdr64; //x64 Header.
} unHdr;
};[[nodiscard]] auto GetDataDirs()const->std::optional<PEDATADIR_VEC>;Returns an array of file's Data directories structs.
struct PEDATADIR {
IMAGE_DATA_DIRECTORY stDataDir; //Standard header.
std::string strSection; //Name of the section this directory resides in (points to).
};
using PEDATADIR_VEC = std::vector<PEDATADIR>;[[nodiscard]] auto GetSecHeaders()const->std::optional<PESECHDR_VEC>;Returns an array of file's Sections headers structs.
struct PESECHDR {
DWORD dwOffset; //File's raw offset of this section header descriptor.
IMAGE_SECTION_HEADER stSecHdr; //Standard section header.
std::string strSecName; //Section full name.
};
using PESECHDR_VEC = std::vector<PESECHDR>;[[nodiscard]] auto GetExport()const->std::optional<PEEXPORT>;Returns a file's Export information.
struct PEEXPORTFUNC {
DWORD dwFuncRVA; //Function RVA.
DWORD dwOrdinal; //Function ordinal.
DWORD dwNameRVA; //Name RVA.
std::string strFuncName; //Function name.
std::string strForwarderName; //Function forwarder name.
};
struct PEEXPORT {
DWORD dwOffset; //File's raw offset of the Export header descriptor.
IMAGE_EXPORT_DIRECTORY stExportDesc; //Standard export header descriptor.
std::string strModuleName; //Actual module name.
std::vector<PEEXPORTFUNC> vecFuncs; //Array of the exported functions struct.
};Example:
libpe::Clibpe pe(L"PATH_TO_PE_FILE");
const auto peExport = pe.GetExport();
if (!peExport) {
return;
}
peExport->stExportDesc; //IMAGE_EXPORT_DIRECTORY struct.
peExport->strModuleName; //Export module name.
peExport->vecFuncs; //Vector of exported functions.
for (const auto& itFuncs : peExport->vecFuncs) {
itFuncs.strFuncName; //Function name.
itFuncs.dwOrdinal; //Ordinal.
itFuncs.dwFuncRVA; //Function RVA.
itFuncs.strForwarderName; //Forwarder name.
}[[nodiscard]] auto GetImport()const->std::optional<PEIMPORT_VEC>;Returns an array of file's Import table entries.
struct PEIMPORTFUNC {
union UNPEIMPORTTHUNK {
IMAGE_THUNK_DATA32 stThunk32; //x86 standard thunk.
IMAGE_THUNK_DATA64 stThunk64; //x64 standard thunk.
} unThunk;
IMAGE_IMPORT_BY_NAME stImpByName; //Standard IMAGE_IMPORT_BY_NAME struct
std::string strFuncName; //Function name.
};
struct PEIMPORT {
DWORD dwOffset; //File's raw offset of the Import descriptor.
IMAGE_IMPORT_DESCRIPTOR stImportDesc; //Standard Import descriptor.
std::string strModuleName; //Imported module name.
std::vector<PEIMPORTFUNC> vecImportFunc; //Array of imported functions.
};
using PEIMPORT_VEC = std::vector<PEIMPORT>;Example
libpe::Clibpe pe(L"C:\\Windows\\notepad.exe");
const auto peImp = pe.GetImport();
if (!peImp) {
return -1;
}
for (const auto& itModule : *peImp) { //Cycle through all imports that this PE file contains.
std::cout << std::format("{}, Imported funcs: {}\r\n", itModule.strModuleName, itModule.vecImportFunc.size());
for (const auto& itFuncs : itModule.vecImportFunc) { //Cycle through all the functions imported from itModule module.
itFuncs.strFuncName; //Imported function name.
itFuncs.stImpByName; //IMAGE_IMPORT_BY_NAME struct for this function.
itFuncs.unThunk.stThunk32; //Union of IMAGE_THUNK_DATA32 or IMAGE_THUNK_DATA64 (depending on the PE type).
}
}[[nodiscard]] auto GetResources()const->std::optional<PERESROOT>;Returns all file's resources.
The next code snippet populates std::wstring with all resources' types and names that PE binary possesses, and prints it to the standard std::wcout.
#include <format>
#include <iostream>
#include <string>
import libpe;
using namespace libpe;
int main()
{
libpe::Clibpe pe;
if (pe.OpenFile(L"C:\\Windows\\notepad.exe") != PEOK) {
return -1;
}
const auto peResRoot = pe.GetResources();
if (!peResRoot) {
return -1;
}
std::wstring wstrResData; //This wstring will contain all resources by name.
for (const auto& iterRoot : peResRoot->vecResData) { //Main loop to extract Resources.
auto ilvlRoot = 0;
auto pResDirEntry = &iterRoot.stResDirEntry; //ROOT IMAGE_RESOURCE_DIRECTORY_ENTRY
if (pResDirEntry->NameIsString) {
wstrResData += std::format(L"Entry: {} [Name: {}]\r\n", ilvlRoot, iterRoot.wstrResName);
}
else {
if (const auto iter = MapResID.find(pResDirEntry->Id); iter != MapResID.end()) {
wstrResData += std::format(L"Entry: {} [Id: {}, {}]\r\n", ilvlRoot, pResDirEntry->Id, iter->second);
}
else {
wstrResData += std::format(L"Entry: {} [Id: {}]\r\n", ilvlRoot, pResDirEntry->Id);
}
}
if (pResDirEntry->DataIsDirectory) {
auto ilvl2 = 0;
auto pstResLvL2 = &iterRoot.stResLvL2;
for (const auto& iterLvL2 : pstResLvL2->vecResData) {
pResDirEntry = &iterLvL2.stResDirEntry; //Level 2 IMAGE_RESOURCE_DIRECTORY_ENTRY
if (pResDirEntry->NameIsString) {
wstrResData += std::format(L" Entry: {}, Name: {}\r\n", ilvl2, iterLvL2.wstrResName);
}
else {
wstrResData += std::format(L" Entry: {}, Id: {}\r\n", ilvl2, pResDirEntry->Id);
}
if (pResDirEntry->DataIsDirectory) {
auto ilvl3 = 0;
auto pstResLvL3 = &iterLvL2.stResLvL3;
for (const auto& iterLvL3 : pstResLvL3->vecResData) {
pResDirEntry = &iterLvL3.stResDirEntry; //Level 3 IMAGE_RESOURCE_DIRECTORY_ENTRY
if (pResDirEntry->NameIsString) {
wstrResData += std::format(L" Entry: {}, Name: {}\r\n", ilvl3, iterLvL3.wstrResName);
}
else {
wstrResData += std::format(L" Entry: {}, lang: {}\r\n", ilvl3, pResDirEntry->Id);
}
++ilvl3;
}
}
++ilvl2;
}
}
++ilvlRoot;
}
std::wcout << wstrResData;[[nodiscard]] auto GetExceptions()const->std::optional<PEEXCEPTION_VEC>;Returns an array of file's Exception entries.
struct PEEXCEPTION {
DWORD dwOffset; //File's raw offset of the exceptions descriptor.
_IMAGE_RUNTIME_FUNCTION_ENTRY stRuntimeFuncEntry; //Standard _IMAGE_RUNTIME_FUNCTION_ENTRY header.
};
using PEEXCEPTION_VEC = std::vector<PEEXCEPTION>;[[nodiscard]] auto GetSecurity()const->std::optional<PESECURITY_VEC>;Returns an array of file's Security entries.
struct PEWIN_CERTIFICATE { //Full replica of the WIN_CERTIFICATE struct from the <WinTrust.h>.
DWORD dwLength;
WORD wRevision;
WORD wCertificateType;
BYTE bCertificate[1];
};
struct PESECURITY {
DWORD dwOffset; //File's raw offset of this security descriptor.
PEWIN_CERTIFICATE stWinSert; //Standard WIN_CERTIFICATE struct.
};
using PESECURITY_VEC = std::vector<PESECURITY>;[[nodiscard]] auto GetRelocations()const->std::optional<PERELOC_VEC>;Returns an array of file's relocation information.
struct PERELOCDATA {
DWORD dwOffset; //File's raw offset of the Relocation data descriptor.
WORD wRelocType; //Relocation type.
WORD wRelocOffset; //Relocation offset (Offset the relocation must be applied to.)
};
struct PERELOC {
DWORD dwOffset; //File's raw offset of the Relocation descriptor.
IMAGE_BASE_RELOCATION stBaseReloc; //Standard IMAGE_BASE_RELOCATION header.
std::vector<PERELOCDATA> vecRelocData; //Array of the Relocation data struct.
};
using PERELOC_VEC = std::vector<PERELOC>;[[nodiscard]] auto GetDebug()const->std::optional<PEDEBUG_VEC>;Returns an array of file's Debug entries.
struct PEDEBUGDBGHDR {
//dwHdr[6] is an array of the first six DWORDs of IMAGE_DEBUG_DIRECTORY::PointerToRawData data (Debug info header).
//Their meaning varies depending on dwHdr[0] (Signature) value.
//If dwHdr[0] == 0x53445352 (Ascii "RSDS") it's PDB 7.0 file:
// Then dwHdr[1]-dwHdr[4] is GUID (*((GUID*)&dwHdr[1])). dwHdr[5] is Counter/Age.
//If dwHdr[0] == 0x3031424E (Ascii "NB10") it's PDB 2.0 file:
// Then dwHdr[1] is Offset. dwHdr[2] is Time/Signature. dwHdr[3] is Counter/Age.
DWORD dwHdr[6];
std::string strPDBName; //PDB file name/path.
};
struct PEDEBUG {
DWORD dwOffset; //File's raw offset of the Debug descriptor.
IMAGE_DEBUG_DIRECTORY stDebugDir; //Standard IMAGE_DEBUG_DIRECTORY header.
PEDEBUGDBGHDR stDebugHdrInfo; //Debug info header.
};
using PEDEBUG_VEC = std::vector<PEDEBUG>;[[nodiscard]] auto GetTLS()const->std::optional<PETLS>;Returns file's Thread Local Storage information.
struct PETLS {
DWORD dwOffset; //File's raw offset of the TLS header descriptor.
union UNPETLS {
IMAGE_TLS_DIRECTORY32 stTLSDir32; //x86 standard TLS header.
IMAGE_TLS_DIRECTORY64 stTLSDir64; //x64 TLS header.
} unTLS;
std::vector<DWORD> vecTLSCallbacks; //Array of the TLS callbacks.
};[[nodiscard]] auto GetLoadConfig()const->std::optional<PELOADCONFIG>;Returns file's Load Config Directory info.
struct PELOADCONFIG {
DWORD dwOffset; //File's raw offset of the LCD descriptor.
union UNPELOADCONFIG {
IMAGE_LOAD_CONFIG_DIRECTORY32 stLCD32; //x86 LCD descriptor.
IMAGE_LOAD_CONFIG_DIRECTORY64 stLCD64; //x64 LCD descriptor.
} unLCD;
};[[nodiscard]] auto GetBoundImport()const->std::optional<PEBOUNDIMPORT_VEC>;Returns an array of file's Bound Import entries.
struct PEBOUNDFORWARDER {
DWORD dwOffset; //File's raw offset of the Bound Forwarder descriptor.
IMAGE_BOUND_FORWARDER_REF stBoundForwarder; //Standard IMAGE_BOUND_FORWARDER_REF struct.
std::string strBoundForwarderName; //Bound forwarder name.
};
struct PEBOUNDIMPORT {
DWORD dwOffset; //File's raw offset of the Bound Import descriptor.
IMAGE_BOUND_IMPORT_DESCRIPTOR stBoundImpDesc; //Standard IMAGE_BOUND_IMPORT_DESCRIPTOR struct.
std::string strBoundName; //Bound Import name.
std::vector<PEBOUNDFORWARDER> vecBoundForwarder; //Array of the Bound Forwarder structs.
};
using PEBOUNDIMPORT_VEC = std::vector<PEBOUNDIMPORT>;[[nodiscard]] auto GetDelayImport()const->std::optional<PEDELAYIMPORT_VEC>;Returns an array of file's Delay Import entries.
struct PEDELAYIMPORTFUNC {
union UNPEDELAYIMPORTTHUNK {
struct x32 {
IMAGE_THUNK_DATA32 stImportAddressTable; //x86 Import Address Table struct.
IMAGE_THUNK_DATA32 stImportNameTable; //x86 Import Name Table struct.
IMAGE_THUNK_DATA32 stBoundImportAddressTable; //x86 Bound Import Address Table struct.
IMAGE_THUNK_DATA32 stUnloadInformationTable; //x86 Unload Information Table struct.
} st32;
struct x64 {
IMAGE_THUNK_DATA64 stImportAddressTable; //x64 Import Address Table struct.
IMAGE_THUNK_DATA64 stImportNameTable; //x64 Import Name Table struct.
IMAGE_THUNK_DATA64 stBoundImportAddressTable; //x64 Bound Import Address Table struct
IMAGE_THUNK_DATA64 stUnloadInformationTable; //x64 Unload Information Table struct.
} st64;
} unThunk;
IMAGE_IMPORT_BY_NAME stImpByName; //Standard IMAGE_IMPORT_BY_NAME struct.
std::string strFuncName; //Function name.
};
struct PEDELAYIMPORT {
DWORD dwOffset; //File's raw offset of this Delay Import descriptor.
IMAGE_DELAYLOAD_DESCRIPTOR stDelayImpDesc; //Standard IMAGE_DELAYLOAD_DESCRIPTOR struct.
std::string strModuleName; //Import module name.
std::vector<PEDELAYIMPORTFUNC> vecDelayImpFunc; //Array of the Delay Import module functions.
};
using PEDELAYIMPORT_VEC = std::vector<PEDELAYIMPORT>;[[nodiscard]] auto GetCOMDescriptor()const->std::optional<PECOMDESCRIPTOR>;Gets file's .NET info.
struct PECOMDESCRIPTOR {
DWORD dwOffset; //File's raw offset of the IMAGE_COR20_HEADER descriptor.
IMAGE_COR20_HEADER stCorHdr; //Standard IMAGE_COR20_HEADER struct.
};These freestanding methods do not need an active Clibpe object with an opened file. They instead take references to the previously obtained structures.
[[nodiscard]] inline constexpr auto GetFileType(const PENTHDR& stNTHdr)->EFileTypeReturns PE file type in form of the EFileType enum.
enum class EFileType : std::uint8_t {
UNKNOWN = 0, PE32, PE64, PEROM
};[[nodiscard]] inline constexpr auto GetImageBase(const PENTHDR& stNTHdr)->ULONGLONGReturns file's Image Base.
[[nodiscard]] inline constexpr auto GetOffsetFromRVA(ULONGLONG ullRVA, const PESECHDR_VEC& vecSecHdr)->DWORDConverts file's RVA to the file's physical raw offset on disk.
[[nodiscard]] inline constexpr auto FlatResources(const PERESROOT& stResRoot)This function is kind of a light version of the GetResources method. It takes PERESROOT struct returned by the GetResources, and returns std::vector of PERESFLAT structures.
PERESFLAT is a light struct that only possesses pointers to an actual resources data, unlike heavy PERESROOT. FlatResources flattens all resources, making accessing them more convenient.
struct PERESFLAT {
std::span<const std::byte> spnData { }; //Resource data.
std::wstring_view wsvTypeStr { }; //Resource Type name.
std::wstring_view wsvNameStr { }; //Resource Name name (resource itself name).
std::wstring_view wsvLangStr { }; //Resource Lang name.
WORD wTypeID { }; //Resource Type ID (RT_CURSOR, RT_BITMAP, etc...).
WORD wNameID { }; //Resource Name ID (resource itself ID).
WORD wLangID { }; //Resource Lang ID.
};
using PERESFLAT_VEC = std::vector<PERESFLAT>;A PE file consists of many structures, they in turn possess many fields some of which have predefined values.
These maps are meant to alleviate such fields' conversion to a human-reading format. They are simple std::unordered_map<DWORD, std::wstring_view> maps.
Note that some fields can only have one value, while the others can combine many values with a bitwise or | operation.
This map forms one of the values from IMAGE_NT_HEADERS::IMAGE_FILE_HEADER::Machine field.
This map forms one or more values from IMAGE_NT_HEADERS::IMAGE_FILE_HEADER::Characteristics field.
const auto pNTHdr = m_pLibpe->GetNTHeader();
const auto pDescr = &pNTHdr->unHdr.stNTHdr32.FileHeader; //Same for both x86/x64.
std::wstring wstrCharact;
for (const auto& flags : MapFileHdrCharact) {
if (flags.first & pDescr->Characteristics) {
wstrCharact += flags.second;
wstrCharact += L"\n";
}
}This map forms one of the values from IMAGE_NT_HEADERS::IMAGE_OPTIONAL_HEADER::Magic field.
This map forms one of the values from IMAGE_NT_HEADERS::IMAGE_OPTIONAL_HEADER::Subsystem field.
This map forms one or more values from IMAGE_NT_HEADERS::IMAGE_OPTIONAL_HEADER::DllCharacteristics field.
const auto pNTHdr = m_pLibpe->GetNTHeader();
const auto pOptHdr = &pNTHdr->unHdr.stNTHdr32.OptionalHeader //For x64: pNTHdr->unHdr.stNTHdr64.OptionalHeader
std::wstring wstrCharact;
for (const auto& flags : MapOptHdrDllCharact) {
if (flags.first & pOptHdr->DllCharacteristics) {
wstrCharact += flags.second;
wstrCharact += L"\n";
}
}This map forms one or more values from IMAGE_SECTION_HEADER::Characteristics field.
const auto pSecHeaders = m_pLibpe->GetSecHeaders();
std::wstring wstrCharact;
auto IdOfSection = 0; //ID of desired section.
for (const auto& flags : MapSecHdrCharact) {
if (flags.first & pSecHeaders->at(IdOfSection).stSecHdr.Characteristics) {
wstrCharact += flags.second;
wstrCharact += L"\n";
}
}This map forms one of the values from IMAGE_RESOURCE_DIRECTORY_ENTRY::Id field.
This map forms one of the values from WIN_CERTIFICATE::wRevision field.
This map forms one of the values from WIN_CERTIFICATE::wCertificateType field.
This map forms one of the values from PERELOCDATA::wRelocType field.
This map forms one of the values from IMAGE_DEBUG_DIRECTORY::Type field.
This map forms one of the values from IMAGE_TLS_DIRECTORY::Characteristics field.
This map forms one or more values from IMAGE_LOAD_CONFIG_DIRECTORY::GuardFlags field.
const auto pLCD = m_pLibpe->GetLoadConfig();
const auto pPELCD = &pLCD->unLCD.stLCD32; //For x64: pLCD->unLCD.stLCD64
std::wstring wstrGFlags;
for (const auto& flags : MapLCDGuardFlags) {
if (flags.first & pPELCD->GuardFlags) {
wstrGFlags += flags.second;
wstrGFlags += L"\n";
}
}This map forms one or more values from IMAGE_COR20_HEADER::Flags field.
const auto pCOMDesc = m_pLibpe->GetCOMDescriptor();
std::wstring wstrFlags;
for (const auto& flags : MapCOR20Flags) {
if (flags.first & pCOMDesc->stCorHdr.Flags) {
wstrFlags += flags.second;
wstrFlags += L"\n";
}
}This software is available under the MIT License.
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