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CustomLoadLibrary.cpp
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CustomLoadLibrary.cpp
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#include "CustomLoadLibrary.h"
CustomLoadLibrary* CustomLoadLibrary::instance()
{
static CustomLoadLibrary Instance;
return &Instance;
}
LPVOID CustomLoadLibrary::MapFile2Mem(HANDLE _hFile)
{
HANDLE t_hMapping = CreateFileMapping(_hFile, NULL, PAGE_READONLY, 0, 0, NULL);
if (t_hMapping == NULL)
return NULL;
LPVOID t_pBaseAddress = MapViewOfFile(t_hMapping, FILE_MAP_READ, 0, 0, 0);
// 这两个HANDLE已经不需要了
CloseHandle(t_hMapping);
if (t_pBaseAddress == NULL)
return NULL;
PIMAGE_DOS_HEADER t_pDosHeader = static_cast<PIMAGE_DOS_HEADER>(t_pBaseAddress);
// Really an MZ file ?
if (t_pDosHeader->e_magic != IMAGE_DOS_SIGNATURE)
{
UnmapViewOfFile(t_pBaseAddress);
return NULL;
}
PIMAGE_NT_HEADERS t_pNTHeader = reinterpret_cast<PIMAGE_NT_HEADERS>(reinterpret_cast<PBYTE>(t_pDosHeader) + t_pDosHeader->e_lfanew);
//判断是PE格式文件并且是DLL，而且指令集和当前一致
if (t_pNTHeader->Signature != IMAGE_NT_SIGNATURE ||
t_pNTHeader->FileHeader.Machine != GetCurrentMachine() ||
(t_pNTHeader->FileHeader.Characteristics & IMAGE_FILE_DLL) == 0)
{
UnmapViewOfFile(t_pBaseAddress);
return NULL;
}
t_hMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_EXECUTE_READWRITE, 0, t_pNTHeader->OptionalHeader.SizeOfImage, NULL);
if (t_hMapping == NULL)
{
UnmapViewOfFile(t_pBaseAddress);
return NULL;
}
LPVOID t_baseDll = NULL;// MapViewOfFileEx(t_hMapping, FILE_EXECUTE | FILE_MAP_WRITE, 0, 0, 0, reinterpret_cast<LPVOID>(t_pNTHeader->OptionalHeader.ImageBase));
if (t_baseDll == NULL)
{
t_baseDll = MapViewOfFileEx(t_hMapping, FILE_EXECUTE | FILE_MAP_WRITE, 0, 0, 0, NULL);
if (t_baseDll == NULL)
{
CloseHandle(t_hMapping);
UnmapViewOfFile(t_pBaseAddress);
return NULL;
}
}
CloseHandle(t_hMapping);
//复制PE头
memcpy(t_baseDll, t_pBaseAddress, t_pNTHeader->OptionalHeader.SizeOfHeaders);
//复制各个段
t_pDosHeader = static_cast<PIMAGE_DOS_HEADER>(t_baseDll);
t_pNTHeader = reinterpret_cast<PIMAGE_NT_HEADERS>(reinterpret_cast<PBYTE>(t_pDosHeader) + t_pDosHeader->e_lfanew);
PIMAGE_SECTION_HEADER pSection = IMAGE_FIRST_SECTION(t_pNTHeader);
for (int i = 0; i < t_pNTHeader->FileHeader.NumberOfSections; i++, pSection++)
memcpy((PBYTE)t_baseDll + pSection->VirtualAddress, (PBYTE)t_pBaseAddress + pSection->PointerToRawData, pSection->SizeOfRawData);
UnmapViewOfFile(t_pBaseAddress);
return t_baseDll;
}
void CustomLoadLibrary::Relocation(LPVOID _baseDll)
{
PIMAGE_DOS_HEADER t_pDosHeader = static_cast<PIMAGE_DOS_HEADER>(_baseDll);
PIMAGE_NT_HEADERS t_pNTHeader = reinterpret_cast<PIMAGE_NT_HEADERS>(reinterpret_cast<PBYTE>(t_pDosHeader) + t_pDosHeader->e_lfanew);
if (_baseDll == reinterpret_cast<LPVOID>(t_pNTHeader->OptionalHeader.ImageBase))
return;
PIMAGE_DATA_DIRECTORY t_relocDir = &(t_pNTHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC]);
if (t_relocDir->Size == 0)
return;
PIMAGE_BASE_RELOCATION t_baseRel = (PIMAGE_BASE_RELOCATION)((PBYTE)_baseDll + t_relocDir->VirtualAddress);
size_t t_relocOffset = ((PBYTE)_baseDll - (PBYTE)(t_pNTHeader->OptionalHeader.ImageBase));
while (t_baseRel->VirtualAddress != NULL)
{
WORD* t_relValue = (WORD*)(t_baseRel + 1);
DWORD t_nEntries = (t_baseRel->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(WORD);
PBYTE t_pageAddress = (PBYTE)_baseDll + t_baseRel->VirtualAddress;
for (DWORD i = 0; i < t_nEntries; i++, t_relValue++)
{
unsigned short pageOffset = *t_relValue & 0x0FFF;
unsigned char type = *t_relValue >> 12;
switch (type)
{
case IMAGE_REL_BASED_HIGHLOW: //32位重定位
case IMAGE_REL_BASED_DIR64: //64位重定位
{
PBYTE* t_address = (PBYTE*)(t_pageAddress + pageOffset);
*t_address += t_relocOffset;
break;
}
default:
break;
}
}
t_baseRel = (PIMAGE_BASE_RELOCATION)((PBYTE)t_baseRel + t_baseRel->SizeOfBlock);
}
//修改内存映像里的基址
*(LPVOID*)(&(t_pNTHeader->OptionalHeader.ImageBase)) = _baseDll;
}
BOOL CustomLoadLibrary::ResolveImport(LPVOID _baseDll, TMODULE* _pModule)
{
PIMAGE_DOS_HEADER t_pDosHeader = static_cast<PIMAGE_DOS_HEADER>(_baseDll);
PIMAGE_NT_HEADERS t_pNTHeader = reinterpret_cast<PIMAGE_NT_HEADERS>(reinterpret_cast<PBYTE>(t_pDosHeader) + t_pDosHeader->e_lfanew);
PIMAGE_DATA_DIRECTORY t_importsDir = (PIMAGE_DATA_DIRECTORY) & (t_pNTHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]);
if (t_importsDir->Size == 0)
return TRUE;
PIMAGE_IMPORT_DESCRIPTOR t_baseImp = (PIMAGE_IMPORT_DESCRIPTOR)((PBYTE)_baseDll + t_importsDir->VirtualAddress);
for (; t_baseImp->Characteristics != 0; ++t_baseImp)
{
PIMAGE_THUNK_DATA t_symbolRef = (PIMAGE_THUNK_DATA)((PBYTE)_baseDll + t_baseImp->FirstThunk);
PIMAGE_THUNK_DATA t_nameRef = (PIMAGE_THUNK_DATA)((PBYTE)_baseDll + t_baseImp->OriginalFirstThunk);
std::string t_szmoduleName((const char*)(_baseDll)+t_baseImp->Name);
HMODULE t_hModule = AppendSubMoudle(t_szmoduleName, _pModule);
if (t_hModule == NULL)
return FALSE;
//针对自定义模块需要修改
for (; t_nameRef->u1.Function != 0; t_nameRef++, t_symbolRef++)
{
if ((t_nameRef->u1.Ordinal & IMAGE_ORDINAL_FLAG) != 0)
{
*(FARPROC*)(&t_symbolRef->u1.Function) = GetProcAddress(t_hModule, LPCSTR(t_nameRef->u1.Ordinal & 0xFFFF));
}
else
{
PIMAGE_IMPORT_BY_NAME ImageImportByName = (PIMAGE_IMPORT_BY_NAME)((PBYTE)_baseDll + t_nameRef->u1.AddressOfData);
*(FARPROC*)(&t_symbolRef->u1.Function) = GetProcAddress(t_hModule, &ImageImportByName->Name[0]);
}
}
}
return TRUE;
}
void CustomLoadLibrary::ProtectingSections(LPVOID _baseDll)
{
PIMAGE_DOS_HEADER t_pDosHeader = static_cast<PIMAGE_DOS_HEADER>(_baseDll);
PIMAGE_NT_HEADERS t_pNTHeader = reinterpret_cast<PIMAGE_NT_HEADERS>(reinterpret_cast<PBYTE>(t_pDosHeader) + t_pDosHeader->e_lfanew);
PIMAGE_SECTION_HEADER pSection = IMAGE_FIRST_SECTION(t_pNTHeader);
for (int i = 0; i < t_pNTHeader->FileHeader.NumberOfSections; i++, pSection++)
{
DWORD t_secSize = pSection->SizeOfRawData;
if (t_secSize == 0)
{
if (pSection->Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
t_secSize = t_pNTHeader->OptionalHeader.SizeOfInitializedData;
else if (pSection->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
t_secSize = t_pNTHeader->OptionalHeader.SizeOfUninitializedData;
else
continue;
}
DWORD t_oldProtect, t_newProtect;
BOOL t_protectR = (pSection->Characteristics & IMAGE_SCN_MEM_READ) ? TRUE : FALSE;
BOOL t_protectW = (pSection->Characteristics & IMAGE_SCN_MEM_WRITE) ? TRUE : FALSE;
BOOL t_protectX = (pSection->Characteristics & IMAGE_SCN_MEM_EXECUTE) ? TRUE : FALSE;
if (!t_protectR && !t_protectW && t_protectX) t_newProtect = PAGE_EXECUTE;
else if (t_protectR && !t_protectW && t_protectX) t_newProtect = PAGE_EXECUTE_READ;
else if (t_protectR && !t_protectW && t_protectX) t_newProtect = PAGE_EXECUTE_READWRITE;
else if (!t_protectR && t_protectW && t_protectX) t_newProtect = PAGE_EXECUTE_WRITECOPY;
else if (!t_protectR && !t_protectW && !t_protectX) t_newProtect = PAGE_NOACCESS;
else if (!t_protectR && t_protectW && !t_protectX) t_newProtect = PAGE_WRITECOPY;
else if (t_protectR && !t_protectW && !t_protectX) t_newProtect = PAGE_READONLY;
else if (t_protectR && t_protectW && !t_protectX) t_newProtect = PAGE_READWRITE;
if (pSection->Characteristics & IMAGE_SCN_MEM_NOT_CACHED)
t_newProtect |= PAGE_NOCACHE;
VirtualProtect((PBYTE)_baseDll + pSection->VirtualAddress, t_secSize, t_newProtect, &t_oldProtect);
}
}
HMODULE CustomLoadLibrary::LoadLibraryWrapped(const std::string& _lpFileName)
{
HMODULE t_hModule = GetModuleHandleWrapped(_lpFileName);
if (t_hModule != NULL)
{
if (!contain(m_mapHInstances, t_hModule))
t_hModule = ::LoadLibraryA(_lpFileName.c_str());
else
m_mapHInstances[t_hModule]->instances++;
return t_hModule;
}
if (m_CustomModuleNames.find(_lpFileName) == m_CustomModuleNames.end())
{
t_hModule = ::LoadLibraryA(_lpFileName.c_str());
return t_hModule;
}
std::string t_fullPath;
HANDLE t_hFile = OpenFile(_lpFileName, t_fullPath);
if (t_hFile == INVALID_HANDLE_VALUE)
return NULL;
LPVOID t_BaseDll = MapFile2Mem(t_hFile);
CloseHandle(t_hFile);
if (t_BaseDll == NULL)
return NULL;
char t_buff[MAX_PATH], * t_NamePart;
GetFullPathNameA(t_fullPath.c_str(), MAX_PATH, &t_buff[0], &t_NamePart);
std::string t_ModuleName = stringToLower(std::string(t_NamePart));
TMODULE* t_pModule = AppendCustomMoudle(t_ModuleName, static_cast<HMODULE>(t_BaseDll));
Relocation(t_BaseDll);
if (!ResolveImport(t_BaseDll, t_pModule))
{
FreeLibrary((HMODULE)t_BaseDll);
return NULL;
}
ProtectingSections(t_BaseDll);
runTlsCallback(t_BaseDll, DLL_PROCESS_ATTACH);
if (!runDllEntryProc(t_BaseDll, DLL_PROCESS_ATTACH))
{
FreeLibrary((HMODULE)t_BaseDll);
return NULL;
}
return (HMODULE)t_BaseDll;
}