diff options
Diffstat (limited to 'NorthstarDLL/hooks.cpp')
| -rw-r--r-- | NorthstarDLL/hooks.cpp | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/NorthstarDLL/hooks.cpp b/NorthstarDLL/hooks.cpp new file mode 100644 index 00000000..2b117178 --- /dev/null +++ b/NorthstarDLL/hooks.cpp @@ -0,0 +1,338 @@ +#include "pch.h" +#include "dedicated.h" + +#include <iostream> +#include <wchar.h> +#include <iostream> +#include <vector> +#include <fstream> +#include <sstream> +#include <filesystem> +#include <Psapi.h> + +namespace fs = std::filesystem; + +AUTOHOOK_INIT() + +// called from the ON_DLL_LOAD macros +__dllLoadCallback::__dllLoadCallback( + eDllLoadCallbackSide side, const std::string dllName, DllLoadCallbackFuncType callback, std::string uniqueStr, std::string reliesOn) +{ + switch (side) + { + case eDllLoadCallbackSide::UNSIDED: + { + AddDllLoadCallback(dllName, callback, uniqueStr, reliesOn); + break; + } + + case eDllLoadCallbackSide::CLIENT: + { + AddDllLoadCallbackForClient(dllName, callback, uniqueStr, reliesOn); + break; + } + + case eDllLoadCallbackSide::DEDICATED_SERVER: + { + AddDllLoadCallbackForDedicatedServer(dllName, callback, uniqueStr, reliesOn); + break; + } + } +} + +void __fileAutohook::Dispatch() +{ + for (__autohook* hook : hooks) + hook->Dispatch(); +} + +void __fileAutohook::DispatchForModule(const char* pModuleName) +{ + const int iModuleNameLen = strlen(pModuleName); + + for (__autohook* hook : hooks) + if ((hook->iAddressResolutionMode == __autohook::OFFSET_STRING && !strncmp(pModuleName, hook->pAddrString, iModuleNameLen)) || + (hook->iAddressResolutionMode == __autohook::PROCADDRESS && !strcmp(pModuleName, hook->pModuleName))) + hook->Dispatch(); +} + +ManualHook::ManualHook(const char* funcName, LPVOID func) + : pHookFunc(func), ppOrigFunc(nullptr) +{ + const int iFuncNameStrlen = strlen(funcName); + pFuncName = new char[iFuncNameStrlen]; + memcpy(pFuncName, funcName, iFuncNameStrlen); +} + +ManualHook::ManualHook(const char* funcName, LPVOID* orig, LPVOID func) + : pHookFunc(func), ppOrigFunc(orig) +{ + const int iFuncNameStrlen = strlen(funcName); + pFuncName = new char[iFuncNameStrlen]; + memcpy(pFuncName, funcName, iFuncNameStrlen); +} + +bool ManualHook::Dispatch(LPVOID addr, LPVOID* orig) +{ + if (orig) + ppOrigFunc = orig; + + if (MH_CreateHook(addr, pHookFunc, ppOrigFunc) == MH_OK) + { + if (MH_EnableHook(addr) == MH_OK) + { + spdlog::info("Enabling hook {}", pFuncName); + return true; + } + else + spdlog::error("MH_EnableHook failed for function {}", pFuncName); + } + else + spdlog::error("MH_CreateHook failed for function {}", pFuncName); + + return false; +} + +// 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; + std::string tag; + std::string reliesOn; + bool called; +}; + +// HACK: declaring and initialising this vector at file scope crashes on debug builds due to static initialisation order +// using a static var like this ensures that the vector is initialised lazily when it's used +std::vector<DllLoadCallback>& GetDllLoadCallbacks() +{ + static std::vector<DllLoadCallback> vec = std::vector<DllLoadCallback>(); + return vec; +} + +void AddDllLoadCallback(std::string dll, DllLoadCallbackFuncType callback, std::string tag, std::string reliesOn) +{ + DllLoadCallback& callbackStruct = GetDllLoadCallbacks().emplace_back(); + + callbackStruct.dll = dll; + callbackStruct.callback = callback; + callbackStruct.tag = tag; + callbackStruct.reliesOn = reliesOn; + callbackStruct.called = false; +} + +void AddDllLoadCallbackForDedicatedServer( + std::string dll, DllLoadCallbackFuncType callback, std::string tag, std::string reliesOn) +{ + if (!IsDedicatedServer()) + return; + + AddDllLoadCallback(dll, callback, tag, reliesOn); +} + +void AddDllLoadCallbackForClient(std::string dll, DllLoadCallbackFuncType callback, std::string tag, std::string reliesOn) +{ + if (IsDedicatedServer()) + return; + + AddDllLoadCallback(dll, callback, tag, reliesOn); +} + +AUTOHOOK_ABSOLUTEADDR(_GetCommandLineA, GetCommandLineA, +LPSTR, WINAPI, (), +{ + static char* cmdlineModified; + static char* cmdlineOrg; + + if (cmdlineOrg == nullptr || cmdlineModified == nullptr) + { + cmdlineOrg = _GetCommandLineA(); + bool isDedi = strstr(cmdlineOrg, "-dedicated"); // well, this one has to be a real argument + bool ignoreStartupArgs = strstr(cmdlineOrg, "-nostartupargs"); + + 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 + + if (!ignoreStartupArgs) + { + + cmdlineArgFile = std::ifstream(!isDedi ? "ns_startup_args.txt" : "ns_startup_args_dedi.txt"); + + if (cmdlineArgFile) + { + std::stringstream argBuffer; + argBuffer << cmdlineArgFile.rdbuf(); + cmdlineArgFile.close(); + + // if some other command line option includes "-northstar" in the future then you have to refactor this check to check with + // both either space after or ending with + if (!isDedi && argBuffer.str().find("-northstar") != std::string::npos) + MessageBoxA( + NULL, + "The \"-northstar\" command line option is NOT supposed to go into ns_startup_args.txt file!\n\nThis option is " + "supposed to go into Origin/Steam game launch options, and then you are supposed to launch the original " + "Titanfall2.exe " + "rather than NorthstarLauncher.exe to make use of it.", + "Northstar Warning", + MB_ICONWARNING); + + args.append(argBuffer.str()); + } + } + + auto len = args.length(); + cmdlineModified = new char[len + 1]; + if (!cmdlineModified) + { + spdlog::error("malloc failed for command line"); + return cmdlineOrg; + } + memcpy(cmdlineModified, args.c_str(), len + 1); + + spdlog::info("Command line: {}", cmdlineModified); + } + + return cmdlineModified; +}) + +std::vector<std::string> calledTags; +void CallLoadLibraryACallbacks(LPCSTR lpLibFileName, HMODULE moduleAddress) +{ + while (true) + { + bool bDoneCalling = true; + + for (auto& callbackStruct : GetDllLoadCallbacks()) + { + if (!callbackStruct.called && fs::path(lpLibFileName).filename() == fs::path(callbackStruct.dll).filename()) + { + if (callbackStruct.reliesOn != "" && + std::find(calledTags.begin(), calledTags.end(), callbackStruct.reliesOn) == calledTags.end()) + { + bDoneCalling = false; + continue; + } + + callbackStruct.callback(moduleAddress); + calledTags.push_back(callbackStruct.tag); + callbackStruct.called = true; + } + } + + if (bDoneCalling) + break; + } +} + +void CallLoadLibraryWCallbacks(LPCWSTR lpLibFileName, HMODULE moduleAddress) +{ + while (true) + { + bool bDoneCalling = true; + + for (auto& callbackStruct : GetDllLoadCallbacks()) + { + if (!callbackStruct.called && fs::path(lpLibFileName).filename() == fs::path(callbackStruct.dll).filename()) + { + if (callbackStruct.reliesOn != "" && + std::find(calledTags.begin(), calledTags.end(), callbackStruct.reliesOn) == calledTags.end()) + { + bDoneCalling = false; + continue; + } + + callbackStruct.callback(moduleAddress); + calledTags.push_back(callbackStruct.tag); + callbackStruct.called = true; + } + } + + if (bDoneCalling) + break; + } +} + +void CallAllPendingDLLLoadCallbacks() +{ + HMODULE hMods[1024]; + HANDLE hProcess = GetCurrentProcess(); + DWORD cbNeeded; + unsigned int i; + + // Get a list of all the modules in this process. + if (EnumProcessModules(hProcess, hMods, sizeof(hMods), &cbNeeded)) + { + for (i = 0; i < (cbNeeded / sizeof(HMODULE)); i++) + { + wchar_t szModName[MAX_PATH]; + + // Get the full path to the module's file. + if (GetModuleFileNameExW(hProcess, hMods[i], szModName, sizeof(szModName) / sizeof(TCHAR))) + { + CallLoadLibraryWCallbacks(szModName, hMods[i]); + } + } + } +} + +AUTOHOOK_ABSOLUTEADDR(_LoadLibraryExA, LoadLibraryExA, +HMODULE, WINAPI, (LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags), + { + HMODULE moduleAddress = _LoadLibraryExA(lpLibFileName, hFile, dwFlags); + + if (moduleAddress) + CallLoadLibraryACallbacks(lpLibFileName, moduleAddress); + + return moduleAddress; +}) + + +AUTOHOOK_ABSOLUTEADDR(_LoadLibraryA, LoadLibraryA, +HMODULE, WINAPI, (LPCSTR lpLibFileName), +{ + HMODULE moduleAddress = _LoadLibraryA(lpLibFileName); + + if (moduleAddress) + CallLoadLibraryACallbacks(lpLibFileName, moduleAddress); + + return moduleAddress; +}) + +AUTOHOOK_ABSOLUTEADDR(_LoadLibraryExW, LoadLibraryExW, +HMODULE, WINAPI, (LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags), +{ + HMODULE moduleAddress = _LoadLibraryExW(lpLibFileName, hFile, dwFlags); + + if (moduleAddress) + CallLoadLibraryWCallbacks(lpLibFileName, moduleAddress); + + return moduleAddress; +}) + +AUTOHOOK_ABSOLUTEADDR(_LoadLibraryW, LoadLibraryW, +HMODULE, WINAPI, (LPCWSTR lpLibFileName), +{ + HMODULE moduleAddress = _LoadLibraryW(lpLibFileName); + + if (moduleAddress) + CallLoadLibraryWCallbacks(lpLibFileName, moduleAddress); + + return moduleAddress; +}) + +void InstallInitialHooks() +{ + if (MH_Initialize() != MH_OK) + spdlog::error("MH_Initialize (minhook initialization) failed"); + + AUTOHOOK_DISPATCH() +}
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