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ImportRebuild.cpp
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ImportRebuild.cpp
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#include "ImportRebuild.h"
#include "Scylla.h"
#include "StringConversion.h"
//#define DEBUG_COMMENTS
ImportRebuild::ImportRebuild()
{
imageData = NULL;
sizeOfFile = 0;
pDosStub = NULL;
pOverlay = NULL;
sizeOfOverlay = 0;
pImportDescriptor = NULL;
pThunkData = NULL;
pImportByName = NULL;
numberOfImportDescriptors = 0;
sizeOfImportSection = 0;
sizeOfApiAndModuleNames = 0;
importSectionIndex = 0;
}
ImportRebuild::~ImportRebuild()
{
delete [] pDosStub;
delete [] imageData;
for (size_t i = 0; i < vecSectionData.size(); i++)
{
delete [] vecSectionData[i];
}
delete [] pOverlay;
}
bool ImportRebuild::splitTargetFile()
{
PIMAGE_SECTION_HEADER pSecHeader = 0;
BYTE * data = 0;
DWORD alignment = 0;
DosHeader = *(IMAGE_DOS_HEADER*)imageData;
if (DosHeader.e_magic != IMAGE_DOS_SIGNATURE)
{
return false;
}
NTHeader = *(IMAGE_NT_HEADERS*)(imageData + DosHeader.e_lfanew);
if (NTHeader.Signature != IMAGE_NT_SIGNATURE)
{
return false;
}
if (DosHeader.e_lfanew > sizeof(IMAGE_DOS_HEADER))
{
size_t sizeOfStub = DosHeader.e_lfanew - sizeof(IMAGE_DOS_HEADER);
pDosStub = new BYTE[sizeOfStub];
CopyMemory(pDosStub, imageData + sizeof(IMAGE_DOS_HEADER), sizeOfStub);
}
pSecHeader = IMAGE_FIRST_SECTION((IMAGE_NT_HEADERS*)(imageData + DosHeader.e_lfanew));
for (WORD i = 0; i < NTHeader.FileHeader.NumberOfSections; i++)
{
const DWORD SECTION_SIZE_MAX = 300000000;
DWORD sizeOfSection = pSecHeader->SizeOfRawData;
if (sizeOfSection > SECTION_SIZE_MAX)
{
sizeOfSection = SECTION_SIZE_MAX;
}
//TODO better use section alignment because it is better?
alignment = alignValue(sizeOfSection, NTHeader.OptionalHeader.SectionAlignment);
data = new BYTE[alignment];
ZeroMemory(data, alignment);
CopyMemory(data, imageData + pSecHeader->PointerToRawData, sizeOfSection);
vecSectionData.push_back(data);
vecSectionHeaders.push_back(*pSecHeader);
pSecHeader++;
}
if(NTHeader.FileHeader.NumberOfSections > 0) // ??
{
const IMAGE_SECTION_HEADER* pLastSec = &(*vecSectionHeaders.rbegin());
DWORD calcSize = pLastSec->PointerToRawData + pLastSec->SizeOfRawData;
if (calcSize < sizeOfFile)
{
sizeOfOverlay = sizeOfFile - calcSize;
pOverlay = new BYTE[sizeOfOverlay];
memcpy(pOverlay, imageData + calcSize, sizeOfOverlay);
}
}
delete [] imageData;
imageData = 0;
return true;
}
bool ImportRebuild::alignSectionHeaders()
{
for (WORD i = 0; i < vecSectionHeaders.size(); i++)
{
vecSectionHeaders[i].VirtualAddress = alignValue(vecSectionHeaders[i].VirtualAddress, NTHeader.OptionalHeader.SectionAlignment);
vecSectionHeaders[i].Misc.VirtualSize = alignValue(vecSectionHeaders[i].Misc.VirtualSize, NTHeader.OptionalHeader.SectionAlignment);
vecSectionHeaders[i].PointerToRawData = alignValue(vecSectionHeaders[i].PointerToRawData, NTHeader.OptionalHeader.FileAlignment);
vecSectionHeaders[i].SizeOfRawData = alignValue(vecSectionHeaders[i].SizeOfRawData, NTHeader.OptionalHeader.FileAlignment);
}
return true;
}
bool ImportRebuild::saveNewFile(const WCHAR * filepath)
{
DWORD fileOffset = 0;
DWORD dwWriteSize = 0;
size_t i = 0;
if (vecSectionHeaders.size() != vecSectionData.size())
{
return false;
}
HANDLE hFile = CreateFile(filepath, GENERIC_WRITE, FILE_SHARE_WRITE | FILE_SHARE_READ, 0,CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if(hFile == INVALID_HANDLE_VALUE)
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"saveNewFile :: INVALID_HANDLE_VALUE %u", GetLastError());
#endif
return false;
}
//alignSectionHeaders();
updatePeHeader();
fileOffset = 0;
dwWriteSize = sizeof(IMAGE_DOS_HEADER);
ProcessAccessHelp::writeMemoryToFile(hFile, fileOffset, dwWriteSize, &DosHeader);
fileOffset += dwWriteSize;
dwWriteSize = DosHeader.e_lfanew - sizeof(IMAGE_DOS_HEADER);
ProcessAccessHelp::writeMemoryToFile(hFile, fileOffset, dwWriteSize, pDosStub);
fileOffset += dwWriteSize;
dwWriteSize = sizeof(IMAGE_NT_HEADERS);
ProcessAccessHelp::writeMemoryToFile(hFile, fileOffset, dwWriteSize, &NTHeader);
fileOffset += dwWriteSize;
dwWriteSize = sizeof(IMAGE_SECTION_HEADER);
for (i = 0; i < vecSectionHeaders.size(); i++)
{
if (!ProcessAccessHelp::writeMemoryToFile(hFile, fileOffset, dwWriteSize, &vecSectionHeaders[i]))
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"saveNewFile :: writeMemoryToFile failed offset %X size %X", fileOffset, dwWriteSize);
#endif
CloseHandle(hFile);
return false;
}
fileOffset += dwWriteSize;
}
for (i = 0; i < vecSectionHeaders.size(); i++)
{
dwWriteSize = vecSectionHeaders[i].PointerToRawData - fileOffset;
if (dwWriteSize)
{
if (!writeZeroMemoryToFile(hFile, fileOffset, dwWriteSize))
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"saveNewFile :: writeZeroMemoryToFile failed offset %X size %X", fileOffset, dwWriteSize);
#endif
CloseHandle(hFile);
return false;
}
fileOffset += dwWriteSize;
}
dwWriteSize = vecSectionHeaders[i].SizeOfRawData;
ProcessAccessHelp::writeMemoryToFile(hFile, fileOffset, dwWriteSize, vecSectionData[i]);
fileOffset += dwWriteSize;
}
if(pOverlay)
{
ProcessAccessHelp::writeMemoryToFile(hFile, fileOffset, (DWORD)sizeOfOverlay, pOverlay);
fileOffset += (DWORD)sizeOfOverlay;
}
CloseHandle(hFile);
return true;
}
bool ImportRebuild::writeZeroMemoryToFile(HANDLE hFile, DWORD fileOffset, DWORD size)
{
bool retValue = false;
PVOID zeromemory = calloc(size, 1);
if (zeromemory)
{
retValue = ProcessAccessHelp::writeMemoryToFile(hFile, fileOffset, size, zeromemory);
free(zeromemory);
}
else
{
retValue = false;
}
return retValue;
}
bool ImportRebuild::addNewSection(char * sectionName, DWORD sectionSize, BYTE * sectionData)
{
BYTE * newBuffer = 0;
IMAGE_SECTION_HEADER pNewSection = {0};
size_t lastSectionIndex = vecSectionHeaders.size() - 1;
size_t nameLength = strlen(sectionName);
if (nameLength > IMAGE_SIZEOF_SHORT_NAME)
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"addNewSection :: sectionname is too long %d", nameLength);
#endif
return false;
}
memcpy_s(pNewSection.Name, IMAGE_SIZEOF_SHORT_NAME, sectionName, nameLength);
pNewSection.SizeOfRawData = alignValue(sectionSize, NTHeader.OptionalHeader.FileAlignment);
pNewSection.Misc.VirtualSize = alignValue(sectionSize, NTHeader.OptionalHeader.SectionAlignment);
pNewSection.PointerToRawData = alignValue(vecSectionHeaders[lastSectionIndex].PointerToRawData + vecSectionHeaders[lastSectionIndex].SizeOfRawData, NTHeader.OptionalHeader.FileAlignment);
pNewSection.VirtualAddress = alignValue(vecSectionHeaders[lastSectionIndex].VirtualAddress + vecSectionHeaders[lastSectionIndex].Misc.VirtualSize, NTHeader.OptionalHeader.SectionAlignment);
pNewSection.Characteristics = IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE|IMAGE_SCN_CNT_CODE|IMAGE_SCN_CNT_INITIALIZED_DATA;
vecSectionHeaders.push_back(pNewSection);
if ( (sectionSize != pNewSection.SizeOfRawData) || (sectionData == 0) )
{
newBuffer = new BYTE[pNewSection.SizeOfRawData];
ZeroMemory(newBuffer, pNewSection.SizeOfRawData);
if (sectionData)
{
CopyMemory(newBuffer, sectionData, sectionSize);
}
}
else
{
newBuffer = sectionData;
}
vecSectionData.push_back(newBuffer);
return true;
}
bool ImportRebuild::loadTargetFile(const WCHAR * filepath)
{
HANDLE hTargetFile = INVALID_HANDLE_VALUE;
DWORD fileSize = 0;
bool retValue = false;
hTargetFile = CreateFile(filepath, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if(hTargetFile == INVALID_HANDLE_VALUE)
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"loadTargetFile :: INVALID_HANDLE_VALUE %u", GetLastError());
#endif
return false;
}
fileSize = (DWORD)ProcessAccessHelp::getFileSize(hTargetFile);
if (!fileSize)
{
CloseHandle(hTargetFile);
hTargetFile = 0;
return false;
}
imageData = new BYTE[fileSize];
if (!imageData)
{
retValue = false;
}
else
{
sizeOfFile = fileSize;
retValue = ProcessAccessHelp::readMemoryFromFile(hTargetFile, 0, fileSize, imageData);
}
CloseHandle(hTargetFile);
hTargetFile = 0;
return retValue;
}
DWORD ImportRebuild::alignValue(DWORD badValue, DWORD alignTo)
{
return (((badValue + alignTo - 1) / alignTo) * alignTo);
}
DWORD ImportRebuild::convertRVAToOffsetVector(DWORD dwRVA)
{
for (size_t i = 0; i < vecSectionHeaders.size(); i++)
{
if ((vecSectionHeaders[i].VirtualAddress <= dwRVA) && ((vecSectionHeaders[i].VirtualAddress + vecSectionHeaders[i].Misc.VirtualSize) > dwRVA))
{
return ((dwRVA - vecSectionHeaders[i].VirtualAddress) + vecSectionHeaders[i].PointerToRawData);
}
}
return 0;
}
/*
DWORD ImportRebuild::convertRVAToOffset(DWORD dwRVA)
{
PIMAGE_SECTION_HEADER pSectionHeader = IMAGE_FIRST_SECTION(&NTHeader);
for (WORD i = 0; i < NTHeader.FileHeader.NumberOfSections; i++)
{
if ((pSectionHeader->VirtualAddress <= dwRVA) && ((pSectionHeader->VirtualAddress + pSectionHeader->Misc.VirtualSize) > dwRVA))
{
return ((dwRVA - pSectionHeader->VirtualAddress) + pSectionHeader->PointerToRawData);
}
pSectionHeader++;
}
return 0;
}
*/
DWORD_PTR ImportRebuild::convertOffsetToRVAVector(DWORD dwOffset)
{
for (size_t i = 0; i < vecSectionHeaders.size(); i++)
{
if ((vecSectionHeaders[i].PointerToRawData <= dwOffset) && ((vecSectionHeaders[i].PointerToRawData + vecSectionHeaders[i].SizeOfRawData) > dwOffset))
{
return ((dwOffset - vecSectionHeaders[i].PointerToRawData) + vecSectionHeaders[i].VirtualAddress);
}
}
return 0;
}
/*
DWORD ImportRebuild::convertOffsetToRVA(DWORD dwOffset)
{
PIMAGE_SECTION_HEADER pSectionHeader = IMAGE_FIRST_SECTION(&NTHeader);
for (WORD i = 0; i < NTHeader.FileHeader.NumberOfSections; i++)
{
if ((pSectionHeader->PointerToRawData <= dwOffset) && ((pSectionHeader->PointerToRawData + pSectionHeader->SizeOfRawData) > dwOffset))
{
return ((dwOffset - pSectionHeader->PointerToRawData) + pSectionHeader->VirtualAddress);
}
pSectionHeader++;
}
return 0;
}
*/
void ImportRebuild::updatePeHeader()
{
size_t lastSectionIndex = vecSectionHeaders.size() - 1;
NTHeader.FileHeader.NumberOfSections = (WORD)(lastSectionIndex + 1);
NTHeader.OptionalHeader.SizeOfImage = vecSectionHeaders[lastSectionIndex].VirtualAddress + vecSectionHeaders[lastSectionIndex].Misc.VirtualSize;
NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT].VirtualAddress = 0;
NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT].Size = 0;
if (NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress)
{
for (size_t i = 0; i < vecSectionHeaders.size(); i++)
{
if ((vecSectionHeaders[i].VirtualAddress <= NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress) && ((vecSectionHeaders[i].VirtualAddress + vecSectionHeaders[i].Misc.VirtualSize) > NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress))
{
//section must be read and writeable
vecSectionHeaders[i].Characteristics |= IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE;
}
}
NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress = 0;
NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size = 0;
}
NTHeader.OptionalHeader.NumberOfRvaAndSizes = 0x10;
NTHeader.OptionalHeader.SizeOfHeaders = alignValue(DosHeader.e_lfanew + sizeof(DWORD) + sizeof(IMAGE_FILE_HEADER) + NTHeader.FileHeader.SizeOfOptionalHeader + (NTHeader.FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER)), NTHeader.OptionalHeader.FileAlignment);
}
bool ImportRebuild::buildNewImportTable(std::map<DWORD_PTR, ImportModuleThunk> & moduleList)
{
createNewImportSection(moduleList);
importSectionIndex = vecSectionHeaders.size() - 1;
DWORD dwSize = fillImportSection(moduleList);
if (!dwSize)
{
return false;
}
setFlagToIATSection((*moduleList.begin()).second.firstThunk);
NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress = vecSectionHeaders[importSectionIndex].VirtualAddress;
NTHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size = (DWORD)(numberOfImportDescriptors * sizeof(IMAGE_IMPORT_DESCRIPTOR));
return true;
}
bool ImportRebuild::createNewImportSection(std::map<DWORD_PTR, ImportModuleThunk> & moduleList)
{
char sectionName[9] = {0};
//DWORD sectionSize = calculateMinSize(moduleList);
calculateImportSizes(moduleList);
if (wcslen(Scylla::config[IAT_SECTION_NAME].getString()) > IMAGE_SIZEOF_SHORT_NAME)
{
strcpy_s(sectionName, ".SCY");
}
else
{
StringConversion::ToASCII(Scylla::config[IAT_SECTION_NAME].getString(), sectionName, _countof(sectionName));
}
return addNewSection(sectionName, (DWORD)sizeOfImportSection, 0);
}
/*DWORD ImportRebuild::calculateMinSize(std::map<DWORD_PTR, ImportModuleThunk> & moduleList)
{
DWORD dwSize = 0;
std::map<DWORD_PTR, ImportModuleThunk>::iterator mapIt;
std::map<DWORD_PTR, ImportThunk>::iterator mapIt2;
dwSize = (DWORD)((moduleList.size() + 1) * sizeof(IMAGE_IMPORT_DESCRIPTOR)); //last is zero'ed
for ( mapIt = moduleList.begin() ; mapIt != moduleList.end(); mapIt++ )
{
//dwSize += (DWORD)((*mapIt).second.thunkList.size() + sizeof(IMAGE_IMPORT_BY_NAME));
dwSize += (DWORD)(wcslen((*mapIt).second.moduleName) + 1);
for ( mapIt2 = (*mapIt).second.thunkList.begin() ; mapIt2 != (*mapIt).second.thunkList.end(); mapIt2++ )
{
if((*mapIt2).second.name[0] != '\0')
{
dwSize += sizeof(IMAGE_IMPORT_BY_NAME);
dwSize += (DWORD)strlen((*mapIt2).second.name);
}
}
}
return dwSize;
}*/
BYTE * ImportRebuild::getMemoryPointerFromRVA(DWORD_PTR dwRVA)
{
DWORD_PTR offset = convertRVAToOffsetVector((DWORD)dwRVA);
for (size_t i = 0; i < vecSectionHeaders.size(); i++)
{
if ((vecSectionHeaders[i].PointerToRawData <= offset) && ((vecSectionHeaders[i].PointerToRawData + vecSectionHeaders[i].SizeOfRawData) > offset))
{
return (BYTE *)((DWORD_PTR)vecSectionData[i] + (offset - vecSectionHeaders[i].PointerToRawData));
}
}
return 0;
}
DWORD ImportRebuild::fillImportSection( std::map<DWORD_PTR, ImportModuleThunk> & moduleList )
{
std::map<DWORD_PTR, ImportModuleThunk>::iterator mapIt;
std::map<DWORD_PTR, ImportThunk>::iterator mapIt2;
PIMAGE_IMPORT_DESCRIPTOR pImportDesc = 0;
PIMAGE_IMPORT_BY_NAME pImportByName = 0;
PIMAGE_THUNK_DATA pThunk = 0;
ImportModuleThunk * importModuleThunk = 0;
ImportThunk * importThunk = 0;
size_t stringLength = 0;
DWORD_PTR lastRVA = 0;
BYTE * sectionData = vecSectionData[importSectionIndex];
DWORD offset = 0;
pImportDescriptor = (PIMAGE_IMPORT_DESCRIPTOR)(sectionData);
//skip the IMAGE_IMPORT_DESCRIPTOR
offset += (DWORD)(numberOfImportDescriptors * sizeof(IMAGE_IMPORT_DESCRIPTOR));
for ( mapIt = moduleList.begin() ; mapIt != moduleList.end(); mapIt++ )
{
importModuleThunk = &((*mapIt).second);
stringLength = addImportDescriptor(importModuleThunk, offset);
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"fillImportSection :: importDesc.Name %X", pImportDescriptor->Name);
#endif
offset += (DWORD)stringLength; //stringLength has null termination char
pImportByName = (PIMAGE_IMPORT_BY_NAME)((DWORD_PTR)sectionData + offset);
//pThunk = (PIMAGE_THUNK_DATA)(getMemoryPointerFromRVA(importModuleThunk->firstThunk));
lastRVA = importModuleThunk->firstThunk - sizeof(DWORD_PTR);
for ( mapIt2 = (*mapIt).second.thunkList.begin() ; mapIt2 != (*mapIt).second.thunkList.end(); mapIt2++ )
{
importThunk = &((*mapIt2).second);
pThunk = (PIMAGE_THUNK_DATA)(getMemoryPointerFromRVA(importThunk->rva));
//check wrong iat pointer
if (!pThunk)
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"fillImportSection :: Failed to get pThunk RVA: %X", importThunk->rva);
#endif
return 0;
}
if ((lastRVA + sizeof(DWORD_PTR)) != importThunk->rva)
{
//add additional import desc
addSpecialImportDescriptor(importThunk->rva);
}
lastRVA = importThunk->rva;
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"fillImportSection :: importThunk %X pThunk %X pImportByName %X offset %X", importThunk,pThunk,pImportByName,offset);
#endif
stringLength = addImportToImportTable(importThunk, pThunk, pImportByName, offset);
offset += (DWORD)stringLength; //is 0 bei import by ordinal
pImportByName = (PIMAGE_IMPORT_BY_NAME)((DWORD_PTR)pImportByName + stringLength);
}
pImportDescriptor++;
}
return offset;
}
bool ImportRebuild::rebuildImportTable(const WCHAR * targetFilePath, const WCHAR * newFilePath, std::map<DWORD_PTR, ImportModuleThunk> & moduleList)
{
bool retValue = false;
if (loadTargetFile(targetFilePath))
{
splitTargetFile();
retValue = buildNewImportTable(moduleList);
if (retValue)
{
retValue = saveNewFile(newFilePath);
}
return retValue;
}
else
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"rebuildImportTable ::Failed to load target %s", targetFilePath);
#endif
return false;
}
}
void ImportRebuild::setFlagToIATSection(DWORD_PTR iatAddress)
{
for (size_t i = 0; i < vecSectionHeaders.size(); i++)
{
if ((vecSectionHeaders[i].VirtualAddress <= iatAddress) && ((vecSectionHeaders[i].VirtualAddress + vecSectionHeaders[i].Misc.VirtualSize) > iatAddress))
{
//section must be read and writeable
vecSectionHeaders[i].Characteristics |= IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE;
}
}
}
size_t ImportRebuild::addImportToImportTable( ImportThunk * pImport, PIMAGE_THUNK_DATA pThunk, PIMAGE_IMPORT_BY_NAME pImportByName, DWORD sectionOffset)
{
size_t stringLength = 0;
if(pImport->name[0] == '\0')
{
pThunk->u1.AddressOfData = (IMAGE_ORDINAL(pImport->ordinal) | IMAGE_ORDINAL_FLAG);
}
else
{
pImportByName->Hint = pImport->hint;
stringLength = strlen(pImport->name) + 1;
memcpy(pImportByName->Name, pImport->name, stringLength);
pThunk->u1.AddressOfData = convertOffsetToRVAVector(vecSectionHeaders[importSectionIndex].PointerToRawData + sectionOffset);
if (!pThunk->u1.AddressOfData)
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"addImportToImportTable :: failed to get AddressOfData %X %X", vecSectionHeaders[importSectionIndex].PointerToRawData, sectionOffset);
#endif
}
//next import should be nulled
pThunk++;
pThunk->u1.AddressOfData = 0;
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"addImportToImportTable :: pThunk->u1.AddressOfData %X %X %X", pThunk->u1.AddressOfData, pThunk, vecSectionHeaders[importSectionIndex].PointerToRawData + sectionOffset);
#endif
stringLength += sizeof(WORD);
}
return stringLength;
}
size_t ImportRebuild::addImportDescriptor(ImportModuleThunk * pImportModule, DWORD sectionOffset)
{
char dllName[MAX_PATH];
StringConversion::ToASCII(pImportModule->moduleName, dllName, _countof(dllName));
size_t stringLength = strlen(dllName) + 1;
/*
Warning: stringLength MUST include null termination char
*/
memcpy((vecSectionData[importSectionIndex] + sectionOffset), dllName, stringLength); //copy module name to section
pImportDescriptor->FirstThunk = (DWORD)pImportModule->firstThunk;
pImportDescriptor->Name = (DWORD)convertOffsetToRVAVector(vecSectionHeaders[importSectionIndex].PointerToRawData + sectionOffset);
return stringLength;
}
void ImportRebuild::addSpecialImportDescriptor(DWORD_PTR rvaFirstThunk)
{
PIMAGE_IMPORT_DESCRIPTOR oldID = pImportDescriptor;
pImportDescriptor++;
pImportDescriptor->FirstThunk = (DWORD)rvaFirstThunk;
pImportDescriptor->Name = oldID->Name;
}
void ImportRebuild::calculateImportSizes(std::map<DWORD_PTR, ImportModuleThunk> & moduleList)
{
std::map<DWORD_PTR, ImportModuleThunk>::iterator mapIt;
std::map<DWORD_PTR, ImportThunk>::iterator mapIt2;
DWORD_PTR lastRVA = 0;
numberOfImportDescriptors = 0;
sizeOfImportSection = 0;
sizeOfApiAndModuleNames = 0;
numberOfImportDescriptors = moduleList.size() + 1; //last is zero'd
for ( mapIt = moduleList.begin() ; mapIt != moduleList.end(); mapIt++ )
{
lastRVA = (*mapIt).second.firstThunk - sizeof(DWORD_PTR);
sizeOfApiAndModuleNames += (DWORD)(wcslen((*mapIt).second.moduleName) + 1);
for ( mapIt2 = (*mapIt).second.thunkList.begin() ; mapIt2 != (*mapIt).second.thunkList.end(); mapIt2++ )
{
if ((lastRVA + sizeof(DWORD_PTR)) != (*mapIt2).second.rva)
{
numberOfImportDescriptors++; //add additional import desc
}
if((*mapIt2).second.name[0] != '\0')
{
sizeOfApiAndModuleNames += sizeof(WORD); //Hint from IMAGE_IMPORT_BY_NAME
sizeOfApiAndModuleNames += (DWORD)(strlen((*mapIt2).second.name) + 1);
}
lastRVA = (*mapIt2).second.rva;
}
}
sizeOfImportSection = sizeOfApiAndModuleNames + (numberOfImportDescriptors * sizeof(IMAGE_IMPORT_DESCRIPTOR));
}

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