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#include "pch.h"
#include "hooks.h"
#include "hookutils.h"
#include "sigscanning.h"
#include <wchar.h>
#include <iostream>
#include <vector>
#include <filesystem>
typedef HMODULE(*LoadLibraryExAType)(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
HMODULE LoadLibraryExAHook(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
typedef HMODULE(*LoadLibraryExWType)(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
HMODULE LoadLibraryExWHook(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
typedef BOOLEAN(*PDLL_INIT_ROUTINE)(PVOID DllHandle, ULONG Reason, PCONTEXT Context);
typedef BOOLEAN(*LdrpCallInitRoutineType)(PDLL_INIT_ROUTINE EntryPoint, PVOID BaseAddress, ULONG Reason, PVOID Context);
BOOLEAN LdrpCallInitRoutineHook(PDLL_INIT_ROUTINE EntryPoint, PVOID BaseAddress, ULONG Reason, PVOID Context);
LoadLibraryExAType LoadLibraryExAOriginal;
LoadLibraryExWType LoadLibraryExWOriginal;
LdrpCallInitRoutineType LdrpCallInitRoutineHookOriginal;
void InstallInitialHooks()
{
if (MH_Initialize() != MH_OK)
spdlog::error("MH_Initialize failed");
HookEnabler hook;
ENABLER_CREATEHOOK(hook, &LoadLibraryExA, &LoadLibraryExAHook, reinterpret_cast<LPVOID*>(&LoadLibraryExAOriginal));
ENABLER_CREATEHOOK(hook, &LoadLibraryExW, &LoadLibraryExWHook, reinterpret_cast<LPVOID*>(&LoadLibraryExWOriginal));
void* LdrpCallInitRoutine = FindSignature("ntdll.dll", "\x48\x89\x5C\x24\x00\x44\x89\x44\x24\x00\x48\x89\x54\x24", "xxxx?xxxx?xxxx");
ENABLER_CREATEHOOK(hook, LdrpCallInitRoutine, &LdrpCallInitRoutineHook, reinterpret_cast<LPVOID*>(&LdrpCallInitRoutineHookOriginal));
}
// dll load callback stuff
// this allows for code to register callbacks to be run as soon as a dll is loaded, mainly to allow for patches to be made on dll load
struct DllLoadCallback
{
std::string dll;
DllLoadCallbackFuncType callback;
bool called;
bool preinit;
};
std::vector<DllLoadCallback*> dllLoadCallbacks;
void AddDllLoadCallback(std::string dll, DllLoadCallbackFuncType callback, bool preinit)
{
DllLoadCallback* callbackStruct = new DllLoadCallback;
callbackStruct->dll = dll;
callbackStruct->callback = callback;
callbackStruct->called = false;
callbackStruct->preinit = preinit;
dllLoadCallbacks.push_back(callbackStruct);
}
HMODULE LoadLibraryExAHook(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags)
{
HMODULE moduleAddress = LoadLibraryExAOriginal(lpLibFileName, hFile, dwFlags);
if (moduleAddress)
{
for (auto& callbackStruct : dllLoadCallbacks)
{
if (!callbackStruct->called && strstr(lpLibFileName + (strlen(lpLibFileName) - strlen(callbackStruct->dll.c_str())), callbackStruct->dll.c_str()) != nullptr)
{
callbackStruct->callback(moduleAddress);
callbackStruct->called = true;
}
}
}
return moduleAddress;
}
HMODULE LoadLibraryExWHook(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags)
{
HMODULE moduleAddress = LoadLibraryExWOriginal(lpLibFileName, hFile, dwFlags);
if (moduleAddress)
{
for (auto& callbackStruct : dllLoadCallbacks)
{
std::wstring wcharStrDll = std::wstring(callbackStruct->dll.begin(), callbackStruct->dll.end());
const wchar_t* callbackDll = wcharStrDll.c_str();
if (!callbackStruct->called && wcsstr(lpLibFileName + (wcslen(lpLibFileName) - wcslen(callbackDll)), callbackDll) != nullptr)
{
callbackStruct->callback(moduleAddress);
callbackStruct->called = true;
}
}
}
return moduleAddress;
}
BOOLEAN LdrpCallInitRoutineHook(PDLL_INIT_ROUTINE EntryPoint, PVOID BaseAddress, ULONG Reason, PVOID Context)
{
char fullModulePath[MAX_PATH] = { 0 };
GetModuleFileNameA((HMODULE)BaseAddress, fullModulePath, sizeof(fullModulePath));
std::string name = std::filesystem::path(fullModulePath).filename().string();
for (auto& callbackStruct : dllLoadCallbacks)
{
if (!callbackStruct->called && callbackStruct->preinit && name == callbackStruct->dll)
{
callbackStruct->callback((HMODULE)BaseAddress);
callbackStruct->called = true;
}
}
return LdrpCallInitRoutineHookOriginal(EntryPoint, BaseAddress, Reason, Context);
}
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