/
peparser.cpp
1469 lines (1158 loc) · 38.1 KB
/
peparser.cpp
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// Copyright (c) 2016 SMART Technologies. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
#include "peparser.h"
#include "widestring.h"
#include "versionstring.h"
#include "debugdirectory.h"
#include <boost/io/ios_state.hpp>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <algorithm>
#include <wchar.h>
#include <fstream>
// ================================================================================================
#define MAKE_PTR( cast, ptr, addValue ) (cast)( (DWORD_PTR)(ptr) + (DWORD_PTR)(addValue))
// ================================================================================================
namespace peparser
{
bool CompareResult::IsIdentical() const
{
return m_identical;
}
bool CompareResult::IsEquivalent() const
{
return IsIdentical() || m_equivalent;
}
float CompareResult::PercentDifferent() const
{
if(m_fast)
return 100.0f;
else
{
if(m_different == 0)
return 0.0f;
else
return 100.0f * ((float)m_different/(m_same + m_different));
}
}
void CompareResult::PrintInfo(std::wostream& out) const
{
boost::io::ios_base_all_saver ofs(out);
if(IsError())
{
out << L"Error opening one of the files." << L'\n';
return;
}
if(IsIdentical())
out << L"Identical.";
else if(IsEquivalent())
out << L"Functionally equivalent.";
else
out << L"Not equivalent.";
out << L'\n' << L'\n';
if(IsWrongFormat())
out << L"One of the files is not a valid PE." << L'\n';
if(IsCorrupted())
out << L"One of the files is a corrupted PE." << L'\n';
if(IsDifferentSize())
out << L"Different file size." << L'\n';
if(IsDifferentCompiler())
out << L"Different compiler." << L'\n';
if(IsDifferentPath())
out << L"Different build path." << L'\n';
if(IsDifferentPathLength())
out << L"Different build path length." << L'\n';
if(!m_fast)
{
out.precision(2);
out << L"Difference: " << std::fixed << PercentDifferent() << L"% (" << m_different << " bytes)"<< L'\n';
}
out << std::endl;
if(!m_verbose)
return;
out.setf(std::ios::hex, std::ios::basefield);
m_tree->Add(m_interesting);
m_tree->Add(m_dynamicIgnored);
m_tree->Add(m_diffs);
m_tree->Sort();
m_tree->Print(out, L"");
}
// ================================================================================================
PEParser::PEParser(const std::wstring& path)
: m_path(path)
{
}
PEParser::~PEParser()
{
Close();
}
bool PEParser::IsPE(const std::wstring& path, bool& x64)
{
// not sure if this is actually faster than mapping whole file into memory...
std::ifstream file(path.c_str(), std::ios_base::binary | std::ios_base::in);
if(!file.is_open())
return false;
std::string buffer;
buffer.resize(sizeof(IMAGE_DOS_HEADER));
if(!file.read(&buffer[0], sizeof(IMAGE_DOS_HEADER)))
return false;
PIMAGE_DOS_HEADER dosHeader = (PIMAGE_DOS_HEADER)&buffer[0];
if(dosHeader->e_magic != IMAGE_DOS_SIGNATURE)
return false;
file.seekg(dosHeader->e_lfanew);
std::string ntHeaderBuffer;
ntHeaderBuffer.resize(sizeof(IMAGE_NT_HEADERS));
if(!file.read(&ntHeaderBuffer[0], sizeof(IMAGE_NT_HEADERS)))
return false;
PIMAGE_NT_HEADERS ntHeaders = (PIMAGE_NT_HEADERS)&ntHeaderBuffer[0];
x64 = ntHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC;
return ntHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC || ntHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC;
}
bool PEParser::Open(bool rw)
{
WIN32_FILE_ATTRIBUTE_DATA fileInfo;
ZeroMemory(&fileInfo, sizeof(fileInfo));
if(!GetFileAttributesEx(m_path.c_str(), GetFileExInfoStandard, (LPVOID)&fileInfo))
{
std::wcerr << L"Can't read file. " << GetLastError() << std::endl;
return false;
}
if(fileInfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
std::wcerr << L"File is a directory. " << GetLastError() << std::endl;
return false;
}
m_fileSize = fileInfo.nFileSizeLow;
if(rw)
return OpenRW();
else
return OpenReadOnly();
}
bool PEParser::OpenReadOnly()
{
m_file = CreateFile(m_path.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if(m_file == INVALID_HANDLE_VALUE)
{
std::wcerr << L"Failed to open file. " << GetLastError() << std::endl;
return false;
}
m_fileMap = CreateFileMapping(m_file, NULL, PAGE_READONLY, 0, 0, NULL);
if(!m_fileMap)
{
std::wcerr << L"Failed to map file into memory. " << GetLastError() << std::endl;
return false;
}
m_view = MapViewOfFile(m_fileMap, FILE_MAP_READ, 0, 0, 0);
if(!m_view)
{
std::wcerr << L"Failed to open view. " << GetLastError() << std::endl;
return false;
}
MEMORY_BASIC_INFORMATION memInfo;
ZeroMemory(&memInfo, sizeof(memInfo));
if(VirtualQuery(m_view, &memInfo, sizeof(memInfo)) == 0)
{
std::wcerr << L"Failed to query view. " << GetLastError() << std::endl;
return false;
}
m_viewSize = memInfo.RegionSize;
m_open = true;
m_openForWrite = false;
return Initialize();
}
bool PEParser::OpenRW()
{
m_file = CreateFile(m_path.c_str(), GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if(!m_file || m_file == INVALID_HANDLE_VALUE)
{
std::wcerr << L"Failed to open file. " << GetLastError() << std::endl;
return false;
}
m_fileMap = CreateFileMapping(m_file, NULL, PAGE_READWRITE, 0, 0, NULL);
if(!m_fileMap)
{
std::wcerr << L"Failed to map file into memory. " << GetLastError() << std::endl;
return false;
}
m_view = MapViewOfFile(m_fileMap, FILE_MAP_WRITE, 0, 0, 0);
if(!m_view)
{
std::wcerr << L"Failed to open view. " << GetLastError() << std::endl;
return false;
}
MEMORY_BASIC_INFORMATION memInfo;
ZeroMemory(&memInfo, sizeof(memInfo));
if(VirtualQuery(m_view, &memInfo, sizeof(memInfo)) == 0)
{
std::wcerr << L"Failed to query view. " << GetLastError() << std::endl;
return false;
}
m_viewSize = memInfo.RegionSize;
m_open = true;
m_openForWrite = true;
return Initialize();
}
void PEParser::Close()
{
if(m_view)
UnmapViewOfFile(m_view);
if(m_fileMap)
CloseHandle(m_fileMap);
if(m_file && m_file != INVALID_HANDLE_VALUE)
{
if(m_openForWrite)
FlushFileBuffers(m_file);
CloseHandle(m_file);
}
}
bool PEParser::Initialize()
{
if(!m_view)
return false;
PIMAGE_DOS_HEADER dosHeader = (PIMAGE_DOS_HEADER)m_view;
if(IsBadReadPtr(dosHeader, sizeof(IMAGE_DOS_HEADER)))
return false;
if(dosHeader->e_magic != IMAGE_DOS_SIGNATURE)
return false;
m_interesting.push_back(Block(L"DOS Stub", FileOffset(dosHeader), dosHeader->e_lfanew));
PIMAGE_NT_HEADERS ntHeaders = MAKE_PTR(PIMAGE_NT_HEADERS, dosHeader, dosHeader->e_lfanew);
if(!ntHeaders)
return false;
if(IsBadReadPtr(ntHeaders, sizeof(ntHeaders->Signature)))
return false;
if(ntHeaders->Signature != IMAGE_NT_SIGNATURE)
return false;
if(IsBadReadPtr(&ntHeaders->FileHeader, sizeof(IMAGE_FILE_HEADER)))
return false;
m_interesting.push_back(Block(L"PE header", FileOffset(ntHeaders), sizeof(ntHeaders->FileHeader) + ntHeaders->FileHeader.SizeOfOptionalHeader));
if(IsBadReadPtr(&ntHeaders->OptionalHeader, ntHeaders->FileHeader.SizeOfOptionalHeader))
return false;
PIMAGE_SECTION_HEADER sectionHeaders = IMAGE_FIRST_SECTION(ntHeaders);
if(IsBadReadPtr(sectionHeaders, ntHeaders->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER)))
return false;
if(ntHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)
m_pe32Plus = false;
else
if(ntHeaders->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC)
m_pe32Plus = true;
else
return false;
m_validPE = true;
// Ignoring linker timestamp in PE header
m_ignored.push_back(Block(L"PE timestamp", FileOffset(&(ntHeaders->FileHeader.TimeDateStamp)), sizeof(ntHeaders->FileHeader.TimeDateStamp)));
// Ignoring linker checksum in PE header
m_ignored.push_back(Block(L"PE checksum", FileOffset(&(ntHeaders->OptionalHeader.CheckSum)), sizeof(ntHeaders->OptionalHeader.CheckSum)));
ReadSections(ntHeaders);
ReadImportsDirectory(ntHeaders);
ReadExportsDirectory(ntHeaders);
ReadDebugDirectory(ntHeaders);
ReadDigitalSignatureDirectory(ntHeaders);
ReadResourceDirectory(ntHeaders);
std::sort(m_ignored.begin(), m_ignored.end());
std::sort(m_interesting.begin(), m_interesting.end());
return true;
}
bool PEParser::ReadSections(PIMAGE_NT_HEADERS ntHeaders)
{
PIMAGE_SECTION_HEADER sectionHeader = IMAGE_FIRST_SECTION(ntHeaders);
m_interesting.push_back(Block(
L"Sections directory"
, FileOffset(sectionHeader)
, ntHeaders->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER)
));
for(int i = 0; i < ntHeaders->FileHeader.NumberOfSections; i++, sectionHeader++)
{
m_sections.push_back(Block(
MultiByteToWideString(std::string((char*)sectionHeader->Name, IMAGE_SIZEOF_SHORT_NAME))
, sectionHeader->PointerToRawData
, sectionHeader->SizeOfRawData
));
m_interesting.push_back(Block(
L"Section: " + MultiByteToWideString(std::string((char*)sectionHeader->Name, IMAGE_SIZEOF_SHORT_NAME))
, sectionHeader->PointerToRawData
, sectionHeader->SizeOfRawData
));
}
return true;
}
std::string PEParser::SectionData(const std::wstring& name)
{
auto block = std::find_if(m_sections.begin(), m_sections.end(), [&](const Block& block) { return block.description == name; });
if(block == m_sections.end())
return "";
return std::string((const char*)((LPBYTE)m_view + block->offset), block->size);
}
bool PEParser::FindFileOffsetFromRva(PIMAGE_NT_HEADERS ntHeaders, DWORD rva, DWORD& fileOffset)
{
// file offset
PIMAGE_SECTION_HEADER sectionHeader = IMAGE_FIRST_SECTION(ntHeaders);
bool found = false;
for(int i = 0; i < ntHeaders->FileHeader.NumberOfSections; i++, sectionHeader++)
{
DWORD sectionSize = sectionHeader->Misc.VirtualSize;
if(sectionSize == 0) // compensate for Watcom linker strangeness, according to Matt Pietrek
sectionSize = sectionHeader->SizeOfRawData;
if((rva >= sectionHeader->VirtualAddress) && (rva < sectionHeader->VirtualAddress + sectionSize) )
{
found = true;
break;
}
}
if(found)
fileOffset = rva + (int)sectionHeader->PointerToRawData - sectionHeader->VirtualAddress;
return found;
}
bool PEParser::ReadImportsDirectory(PIMAGE_NT_HEADERS ntHeaders)
{
PEDirInfo<IMAGE_IMPORT_DESCRIPTOR> info;
if(!DirectoryInfo(ntHeaders, info))
return false;
IMAGE_IMPORT_DESCRIPTOR* descriptor = info[0];
while(descriptor->Characteristics)
{
DWORD fileOffset = descriptor->Name + info.SectionOffset();
m_dllImports.push_back((char*)((LPBYTE)m_view + fileOffset));
++descriptor;
}
PEDirInfo<ImgDelayDescr> delayLoadInfo;
if(!DirectoryInfo(ntHeaders, delayLoadInfo))
return true;
ImgDelayDescr* delayLoadDescriptor = delayLoadInfo[0];
while(delayLoadDescriptor->grAttrs == dlattrRva && delayLoadDescriptor->rvaDLLName)
{
DWORD fileOffset = 0;
if(FindFileOffsetFromRva(ntHeaders, delayLoadDescriptor->rvaDLLName, fileOffset))
m_dllDelayedImports.push_back((char*)((LPBYTE)m_view + fileOffset));
++delayLoadDescriptor;
}
return true;
}
bool PEParser::ReadExportsDirectory(PIMAGE_NT_HEADERS ntHeaders)
{
PEDirInfo<IMAGE_EXPORT_DIRECTORY> info;
if(!DirectoryInfo(ntHeaders, info))
return false;
m_ignored.push_back(Block(L"Export table timestamp", FileOffset(&info[0]->TimeDateStamp), sizeof(info[0]->TimeDateStamp)));
return true;
}
void PEParser::AddIgnoredRange(const Block& block)
{
m_ignored.push_back(block);
}
void PEParser::AddIgnoredRange(const BlockList& blocks)
{
m_ignored.insert(m_ignored.end(), blocks.begin(), blocks.end());
}
void PEParser::PrintInfo(std::wostream& stream, bool verbose) const
{
boost::io::ios_base_all_saver ofs(stream);
if(IsValidPE() || IsCorrupted())
{
stream.setf(std::ios::dec, std::ios::basefield);
stream << L"Arch : " << ((Is64Bit())?L"64 bit":L"32 bit") << L'\n';
stream << L"Size : " << (float)m_fileSize/1024 << L" Kb" << L'\n';
stream << L"Version : " << FileVersion() << L'\n';
stream << L"PDB : " << PDBPath() << L'\n';
stream << L"PDB GUID: " << PDBGUID() << L'\n';
stream << L"Signed : " << ((IsSigned())?"true (not verified)":"false") << L'\n';
if(IsCorrupted())
stream << L"\n\nFile is corrupted!!\n\n";
stream.setf(std::ios::hex, std::ios::basefield);
stream << L'\n' << L"Ignored offsets:" << L'\n';
stream << m_ignored << L'\n';
stream << L'\n';
stream << L"Imports:" << L"\n";
for(size_t i = 0 ; i < m_dllImports.size(); ++i)
stream << " " << MultiByteToWideString(m_dllImports[i]) << L'\n';
stream << L'\n';
stream << L"Delayed imports:" << L"\n";
for(size_t i = 0 ; i < m_dllDelayedImports.size(); ++i)
stream << " " << MultiByteToWideString(m_dllDelayedImports[i]) << L'\n';
stream << L'\n';
if(verbose)
{
stream << L"File layout:" << L"\n";
BlockNode tree(Block2(L"Whole file", 0, 0, FileSize()));
tree.Add(m_interesting);
tree.Add(m_ignored);
tree.Add(m_resourceBlocks);
tree.Sort();
tree.Print(stream, L"");
}
}
else
{
if(m_view)
stream << L"Invalid PE format?" << L'\n';
else
stream << L"Failed to open file" << L'\n';
}
stream << std::flush;
}
bool PEParser::ReadResourceDirectory(PIMAGE_NT_HEADERS ntHeaders)
{
PEDirInfo<IMAGE_RESOURCE_DIRECTORY> info;
if(!DirectoryInfo(ntHeaders, info))
return false;
ResourceDirectoryTable table(m_view, info, m_resourceBlocks);
std::sort(m_resourceBlocks.begin(), m_resourceBlocks.end());
m_resources = table.Root();
ReadTypeLibrary(m_resources->AtPath(L"@TYPELIB"));
ReadVsVersionInfo(m_resources->AtPath(L"16"));
return true;
}
bool PEParser::ReadTypeLibrary(ResourceEntryPtr node)
{
if(!node)
return false;
if(node->IsData())
return ReadTypeLibrary(node->Address(), node->Size());
bool ret = true;
for(auto& entry : node->Entries())
ret = ReadTypeLibrary(entry.second) && ret;
return ret;
}
bool PEParser::ReadTypeLibrary(LPVOID data, size_t size)
{
if(!data)
return false;
return false;
// disabled because of dependency on GPL'ed code
}
bool PEParser::ReadVsVersionInfo(ResourceEntryPtr node)
{
if(!node)
return false;
if(node->IsData())
return ReadVsVersionInfo(node->Address(), node->Size());
bool ret = true;
for(auto& entry : node->Entries())
ret = ReadVsVersionInfo(entry.second) && ret;
return ret;
}
bool PEParser::ReadVsVersionInfo(LPVOID data, size_t size)
{
if(!data)
return false;
VS_VersionInfo info(data, size);
if(!info.IsWellFormed())
return false;
VS_FIXEDFILEINFO* fixedInfo = info.FixedFileInfo();
m_ignored.push_back(Block(L"VS fixed: file version", FileOffset(&fixedInfo->dwFileVersionMS), 2*sizeof(fixedInfo->dwFileVersionMS)));
m_modifiable.emplace(ModifiableBlocks::FileVersion, m_ignored.back());
m_ignored.push_back(Block(L"VS fixed: product version", FileOffset(&fixedInfo->dwProductVersionMS), 2*sizeof(fixedInfo->dwProductVersionMS)));
m_modifiable.emplace(ModifiableBlocks::ProductVersion, m_ignored.back());
std::wstringstream ss; ss
<< (fixedInfo->dwFileVersionMS >> 8*sizeof(WORD)) << L"."
<< (fixedInfo->dwFileVersionMS & 0x0000FFFF) << L"."
<< (fixedInfo->dwFileVersionLS >> 8*sizeof(WORD)) << L"."
<< (fixedInfo->dwFileVersionLS & 0x0000FFFF)
;
m_fileVersion = ss.str();
m_ignored.push_back(Block(L"VS fixed: date", FileOffset(&fixedInfo->dwFileDateMS), 2*sizeof(DWORD)));
for(auto& entry : info.Entries())
{
if(!entry || !entry->IsWellFormed())
continue;
for(auto& table : entry->Entries())
{
if(!table || !table->IsWellFormed())
continue;
std::wstring comment = L"VS " + table->Name() + L":";
void* value = 0;
size_t valSize = 0;
if(table->OriginalValue(L"FileVersion", &value, &valSize))
{
m_ignored.push_back(Block(comment + L" FileVersion", FileOffset(value), valSize));
m_modifiable.insert(std::make_pair(FileVersionString, m_ignored.back()));
}
if(table->OriginalValue(L"ProductVersion", &value, &valSize))
{
m_ignored.push_back(Block(comment + L" ProductVersion", FileOffset(value), valSize));
m_modifiable.insert(std::make_pair(ProductVersionString, m_ignored.back()));
}
}
}
return true;
}
bool PEParser::ReadDigitalSignatureDirectory(PIMAGE_NT_HEADERS ntHeaders)
{
DWORD certTableRva = 0;
DWORD certTableSize = 0;
if(m_pe32Plus)
{
PIMAGE_OPTIONAL_HEADER64 header = (PIMAGE_OPTIONAL_HEADER64)&ntHeaders->OptionalHeader;
certTableRva = header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY].VirtualAddress;
certTableSize = header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY].Size;
// Always ignoring security entry
m_ignored.push_back(Block(
L"Digital signature directory entry"
, FileOffset(&header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY])
, sizeof(header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY])
));
m_modifiable.insert(std::make_pair(SignatureDirectory, m_ignored.back()));
}
else
{
PIMAGE_OPTIONAL_HEADER32 header = (PIMAGE_OPTIONAL_HEADER32)&ntHeaders->OptionalHeader;
certTableRva = header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY].VirtualAddress;
certTableSize = header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY].Size;
// Always ignoring security entry
m_ignored.push_back(Block(
L"Digital signature directory entry"
, FileOffset(&header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY])
, sizeof(header->DataDirectory[IMAGE_DIRECTORY_ENTRY_SECURITY])
));
m_modifiable.insert(std::make_pair(SignatureDirectory, m_ignored.back()));
}
if(certTableRva == 0 && certTableSize == 0)
return false;
m_signed = true;
m_ignored.push_back(Block(
L"Digital signature section"
, certTableRva
, certTableSize
));
if(certTableRva + certTableSize > FileSize())
{
m_validPE = false;
m_signed = false;
m_corrupted = true;
std::wcerr << "Digital signature section points beyond file limits" << std::endl;
}
return true;
}
bool PEParser::ReadDebugDirectory(PIMAGE_NT_HEADERS ntHeaders)
{
PEDirInfo<IMAGE_DEBUG_DIRECTORY> info;
if(!DirectoryInfo(ntHeaders, info))
return false;
for(size_t i = 0; i < info.Count(); i++)
{
m_ignored.push_back(Block(L"Debugger timestamp", FileOffset(&(info[i]->TimeDateStamp)), sizeof(info[i]->TimeDateStamp)));
switch(info[i]->Type)
{
case IMAGE_DEBUG_TYPE_UNKNOWN:
continue;
case IMAGE_DEBUG_TYPE_CODEVIEW:
{
LPBYTE debugInfo = (LPBYTE)m_view + info[i]->PointerToRawData;
if(IsBadReadPtr(debugInfo, info[i]->SizeOfData))
return false;
if(info[i]->SizeOfData < sizeof(DWORD))
return false;
DWORD cvSignature = *(DWORD*)debugInfo;
m_ignored.push_back(Block(L"PDB section", FileOffset(debugInfo), info[i]->SizeOfData));
if (cvSignature == 'SDSR')
{
if(IsBadReadPtr(debugInfo, sizeof(_RSDSI)))
return false;
_RSDSI* cvInfo = (_RSDSI*)debugInfo;
if(IsBadStringPtrA((CHAR*)cvInfo->szPdb, UINT_MAX))
return false;
m_pdbGuid.resize(39);
int size = ::StringFromGUID2(cvInfo->guidSig, &m_pdbGuid[0], (int)m_pdbGuid.size());
m_pdbGuid.resize(size - 1); // \0
m_ignored.push_back(Block(L"PDB 7.00 guid", FileOffset(&cvInfo->guidSig), sizeof(cvInfo->guidSig)));
m_ignored.push_back(Block(L"PDB 7.00 age", FileOffset(&cvInfo->age), sizeof(cvInfo->age)));
size_t length = strlen((char*)cvInfo->szPdb);
m_pdbPath = MultiByteToWideString(std::string((char*)cvInfo->szPdb, length));
m_ignored.push_back(Block(L"PDB 7.00 file path", FileOffset(&cvInfo->szPdb), length*sizeof(char)));
}
}
}
}
return true;
}
template <class T>
bool PEParser::DirectoryInfo(PIMAGE_NT_HEADERS ntHeaders, PEDirInfo<T>& dir)
{
if(m_pe32Plus)
{
PIMAGE_OPTIONAL_HEADER64 header = (PIMAGE_OPTIONAL_HEADER64)&ntHeaders->OptionalHeader;
dir.SetRva(header->DataDirectory[dir.Index()].VirtualAddress);
dir.SetSize(header->DataDirectory[dir.Index()].Size);
}
else
{
PIMAGE_OPTIONAL_HEADER32 header = (PIMAGE_OPTIONAL_HEADER32)&ntHeaders->OptionalHeader;
dir.SetRva(header->DataDirectory[dir.Index()].VirtualAddress);
dir.SetSize(header->DataDirectory[dir.Index()].Size);
}
if(dir.Rva() == 0 && dir.Size() == 0)
return false;
if(dir.Size() < sizeof(T))
return false;
DWORD fileOffset = 0;
if(!FindFileOffsetFromRva(ntHeaders, dir.Rva(), fileOffset))
return false;
dir.SetFileOffset(fileOffset);
dir.SetSectionOffset(dir.FileOffset() - dir.Rva());
// directory
T* directory = MAKE_PTR(T*, m_view, dir.FileOffset());
if(IsBadReadPtr(directory, dir.Size()))
return false;
dir.SetDirectory(directory);
return true;
}
size_t PEParser::FileOffset(void* pointer) const
{
return (size_t)pointer - (size_t)m_view;
}
size_t PEParser::TotalIgnoredSize() const
{
size_t size = 0;
for(size_t i = 0; i < m_ignored.size(); i++)
size += m_ignored[i].size;
return size;
}
size_t PEParser::NextOffset(size_t currentOffset, size_t& sizeOfBlock, size_t maxSize) const
{
size_t endOfBlock = maxSize;
size_t newOffset = currentOffset;
for(size_t i = 0; i < m_ignored.size(); i++)
{
Block block = m_ignored[i];
if(block.offset + block.size < newOffset)
continue; // past whole block already
if(block.offset <= newOffset && block.offset + block.size > newOffset)
{
newOffset = block.offset + block.size;
continue; // inside the block, moving current offset to the end of the block
}
if(block.offset > newOffset)
{
endOfBlock = block.offset;
break; // outside of the block, setting size of next relevant block
}
}
if(newOffset > maxSize)
sizeOfBlock = endOfBlock - maxSize;
else
sizeOfBlock = endOfBlock - newOffset;
return newOffset;
}
CompareResult PEParser::Compare(const PEParser& p1, const PEParser& p2, bool fast, bool noHeuristics, bool verbose, bool tlbCmpExpr)
{
CompareResult result;
result.SetVerbose(verbose);
if(!p1.IsOpen() || !p2.IsOpen())
{
result.m_error = true;
return result;
}
if(!p1.IsValidPE() || !p2.IsValidPE())
result.m_wrongFormat = true;
result.m_tree.reset(new BlockNode(Block2(L"File 1", 0, 0, p1.FileSize())));
if(verbose)
{
result.m_tree->Add(p1.m_interesting);
result.m_tree->Add(p1.m_ignored);
result.m_tree->Add(p1.m_resourceBlocks);
}
result.m_differentSize = p1.FileSize() - p1.TotalIgnoredSize() != p2.FileSize() - p2.TotalIgnoredSize();
result.m_differentPath = lstrcmpi(p1.PDBPath().c_str(), p2.PDBPath().c_str()) != 0;
result.m_differentPathLength = p1.PDBPath().size() != p1.PDBPath().size();
// Comparing for identical
if(p1.FileSize() == p2.FileSize() && 0 == memcmp(p1.m_view, p2.m_view, p1.FileSize()))
{
result.m_identical = true;
result.m_equivalent = true;
return result;
}
bool firstBlockFound = false;
// Comparing for equivalent
if(fast)
{
result.m_fast = true;
if(!result.m_identical && !result.m_differentSize)
{
LPBYTE index1 = (LPBYTE)p1.m_view;
LPBYTE index2 = (LPBYTE)p2.m_view;
size_t offset1 = 0;
size_t offset2 = 0;
result.m_equivalent = true;
while(true)
{
size_t size1 = 0;
size_t size2 = 0;
offset1 = p1.NextOffset(offset1, size1, p1.FileSize());
offset2 = p2.NextOffset(offset2, size2, p2.FileSize());
size_t currentBlockSize = min(size1, size2);
if(currentBlockSize == 0)
break;
if(0 != memcmp(index1 + offset1, index2 + offset2, currentBlockSize))
{
result.m_interesting.push_back(Block2(L"First different block (1)", offset1, offset2, currentBlockSize));
result.m_equivalent = false;
break;
}
offset1 += currentBlockSize;
offset2 += currentBlockSize;
}
}
}
else
{
result.m_fast = false;
LPBYTE start1 = (LPBYTE)p1.m_view;
LPBYTE start2 = (LPBYTE)p2.m_view;
size_t index = 0;
size_t offset1 = 0;
size_t offset2 = 0;
size_t currentBlockSize = 0;
size_t diffStart1 = 0;
size_t diffStart2 = 0;
size_t diffSize = 0;
size_t diffShift = 0;
bool diff = false;
enum
{
NEXT_BLOCK
, DIFF_START
, DIFF_END
, END_BLOCK
, COMPARE_BLOCK
};
int step = NEXT_BLOCK;
while(true)
{
switch(step)
{
case NEXT_BLOCK:
{
size_t size1 = 0;
size_t size2 = 0;
offset1 = p1.NextOffset(offset1, size1, p1.FileSize());
offset2 = p2.NextOffset(offset2, size2, p2.FileSize());
currentBlockSize = min(size1, size2);
if(currentBlockSize == 0)
if(size1 == 0)
result.m_different += p2.FileSize() - offset2;
else
result.m_different += p1.FileSize() - offset1;
index = 0;
step = COMPARE_BLOCK;
break;
}
case END_BLOCK:
{
offset1 += currentBlockSize;
offset2 += currentBlockSize;
step = NEXT_BLOCK;
break;
}
case DIFF_START:
{
diff = true;
diffStart1 = offset1 + index-1;
diffStart2 = offset2 + index-1;
step = COMPARE_BLOCK;
break;
}
case DIFF_END:
{
diff = false;
step = COMPARE_BLOCK;
diffSize = offset1 + index-1 - diffStart1;
if(diffSize == 0) break; // one file ended before another one
if(!noHeuristics && FilterDifference(result, p1, p2, diffStart1, diffStart2, diffSize, diffShift, tlbCmpExpr))
{
result.m_same += diffSize;
index += diffShift;
}
else
{
result.m_different += diffSize;
if(verbose)
result.m_diffs.push_back(Block2(L">-< Difference >-<", diffStart1, diffStart2, diffSize));
if(!firstBlockFound)
{
result.m_interesting.push_back(Block2(L">-< Difference >-<", diffStart1, diffStart2, diffSize));
firstBlockFound = true;
}
}
break;
}
case COMPARE_BLOCK:
{
if(index >= currentBlockSize)
{
if(diff)
step = DIFF_END;
else
step = END_BLOCK;
break;
}