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#include "pch.h"
#include "hooks.h"
#include "hookutils.h"
#include <wchar.h>
#include <iostream>
#include <vector>
#include <fstream>
#include <sstream>
#include <filesystem>
typedef LPSTR(*GetCommandLineAType)();
LPSTR GetCommandLineAHook();
// note that these load library callbacks only support explicitly loaded dynamic libraries
typedef HMODULE(*LoadLibraryExAType)(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
HMODULE LoadLibraryExAHook(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
typedef HMODULE(*LoadLibraryAType)(LPCSTR lpLibFileName);
HMODULE LoadLibraryAHook(LPCSTR lpLibFileName);
typedef HMODULE(*LoadLibraryExWType)(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
HMODULE LoadLibraryExWHook(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
typedef HMODULE(*LoadLibraryWType)(LPCWSTR lpLibFileName);
HMODULE LoadLibraryWHook(LPCWSTR lpLibFileName);
GetCommandLineAType GetCommandLineAOriginal;
LoadLibraryExAType LoadLibraryExAOriginal;
LoadLibraryAType LoadLibraryAOriginal;
LoadLibraryExWType LoadLibraryExWOriginal;
LoadLibraryWType LoadLibraryWOriginal;
void InstallInitialHooks()
{
if (MH_Initialize() != MH_OK)
spdlog::error("MH_Initialize failed");
HookEnabler hook;
ENABLER_CREATEHOOK(hook, &GetCommandLineA, &GetCommandLineAHook, reinterpret_cast<LPVOID*>(&GetCommandLineAOriginal));
ENABLER_CREATEHOOK(hook, &LoadLibraryExA, &LoadLibraryExAHook, reinterpret_cast<LPVOID*>(&LoadLibraryExAOriginal));
ENABLER_CREATEHOOK(hook, &LoadLibraryA, &LoadLibraryAHook, reinterpret_cast<LPVOID*>(&LoadLibraryAOriginal));
ENABLER_CREATEHOOK(hook, &LoadLibraryExW, &LoadLibraryExWHook, reinterpret_cast<LPVOID*>(&LoadLibraryExWOriginal));
ENABLER_CREATEHOOK(hook, &LoadLibraryW, &LoadLibraryWHook, reinterpret_cast<LPVOID*>(&LoadLibraryWOriginal));
}
char* cmdlineResult;
LPSTR GetCommandLineAHook()
{
static char* cmdlineOrg;
if (cmdlineOrg == nullptr || cmdlineResult == nullptr)
{
cmdlineOrg = GetCommandLineAOriginal();
bool isDedi = strstr(cmdlineOrg, "-dedicated"); // well, this one has to be a real argument
std::string args;
std::ifstream cmdlineArgFile;
// it looks like CommandLine() prioritizes parameters apprearing first, so we want the real commandline to take priority
// not to mention that cmdlineOrg starts with the EXE path
args.append(cmdlineOrg);
args.append(" ");
// append those from the file
cmdlineArgFile = std::ifstream(!isDedi ? "ns_startup_args.txt" : "ns_startup_args_dedi.txt");
if (cmdlineArgFile)
{
std::stringstream argBuffer;
argBuffer << cmdlineArgFile.rdbuf();
cmdlineArgFile.close();
args.append(argBuffer.str());
}
auto len = args.length();
cmdlineResult = reinterpret_cast<char*>(_malloc_base(len + 1));
if (!cmdlineResult)
{
spdlog::error("malloc failed for command line");
return cmdlineOrg;
}
memcpy(cmdlineResult, args.c_str(), len + 1);
spdlog::info("Command line: {}", cmdlineResult);
}
return cmdlineResult;
}
// 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;
};
std::vector<DllLoadCallback*> dllLoadCallbacks;
void AddDllLoadCallback(std::string dll, DllLoadCallbackFuncType callback)
{
DllLoadCallback* callbackStruct = new DllLoadCallback;
callbackStruct->dll = dll;
callbackStruct->callback = callback;
callbackStruct->called = false;
dllLoadCallbacks.push_back(callbackStruct);
}
void CallLoadLibraryACallbacks(LPCSTR lpLibFileName, HMODULE 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;
}
}
}
void CallLoadLibraryWCallbacks(LPCWSTR lpLibFileName, HMODULE 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;
}
}
}
HMODULE LoadLibraryExAHook(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags)
{
HMODULE moduleAddress = LoadLibraryExAOriginal(lpLibFileName, hFile, dwFlags);
if (moduleAddress)
{
CallLoadLibraryACallbacks(lpLibFileName, moduleAddress);
}
return moduleAddress;
}
HMODULE LoadLibraryAHook(LPCSTR lpLibFileName)
{
HMODULE moduleAddress = LoadLibraryAOriginal(lpLibFileName);
if (moduleAddress)
{
CallLoadLibraryACallbacks(lpLibFileName, moduleAddress);
}
return moduleAddress;
}
HMODULE LoadLibraryExWHook(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags)
{
HMODULE moduleAddress = LoadLibraryExWOriginal(lpLibFileName, hFile, dwFlags);
if (moduleAddress)
{
CallLoadLibraryWCallbacks(lpLibFileName, moduleAddress);
}
return moduleAddress;
}
HMODULE LoadLibraryWHook(LPCWSTR lpLibFileName)
{
HMODULE moduleAddress = LoadLibraryWOriginal(lpLibFileName);
if (moduleAddress)
{
CallLoadLibraryWCallbacks(lpLibFileName, moduleAddress);
}
return moduleAddress;
}
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