mirror of
https://github.com/goatcorp/Dalamud.git
synced 2025-12-12 10:17:22 +01:00
436 lines
19 KiB
C++
436 lines
19 KiB
C++
#include "pch.h"
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#include "xivfixes.h"
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#include "bootconfig.h"
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#include "hooks.h"
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#include "logging.h"
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#include "utils.h"
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template<typename T>
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static std::span<T> assume_nonempty_span(std::span<T> t, const char* descr) {
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if (t.empty())
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throw std::runtime_error(std::format("Unexpected empty span found: {}", descr));
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return t;
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}
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void xivfixes::unhook_dll(bool bApply) {
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static const auto LogTag = "[xivfixes:unhook_dll]";
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static const auto LogTagW = L"[xivfixes:unhook_dll]";
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const auto targetDllNames = bootconfig::gamefix_unhookdll_list();
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if (!bApply)
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return;
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const auto mods = utils::loaded_module::all_modules();
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const auto test_module = [&](size_t i, const utils::loaded_module & mod) {
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std::filesystem::path path;
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try {
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path = mod.path();
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logging::I("{} [{}/{}] Module 0x{:X} ~ 0x{:X} (0x{:X}): \"{}\"", LogTagW, i + 1, mods.size(), mod.address_int(), mod.address_int() + mod.image_size(), mod.image_size(), path.wstring());
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} catch (const std::exception& e) {
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logging::W("{} [{}/{}] Module 0x{:X}: Failed to resolve path: {}", LogTag, i + 1, mods.size(), mod.address_int(), e.what());
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return;
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}
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const auto moduleName = unicode::convert<std::string>(path.filename().wstring());
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std::vector<char> buf;
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std::string formatBuf;
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try {
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const auto& sectionHeader = mod.section_header(".text");
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const auto section = assume_nonempty_span(mod.span_as<char>(sectionHeader.VirtualAddress, sectionHeader.Misc.VirtualSize), ".text[VA:VA+VS]");
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auto hFsDllRaw = CreateFileW(path.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, 0, nullptr);
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if (hFsDllRaw == INVALID_HANDLE_VALUE) {
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logging::W("{} Module loaded in current process but could not open file: Win32 error {}", LogTag, GetLastError());
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return;
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}
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auto hFsDll = std::unique_ptr<void, decltype(CloseHandle)*>(hFsDllRaw, &CloseHandle);
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buf.resize(section.size());
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SetFilePointer(hFsDll.get(), sectionHeader.PointerToRawData, nullptr, FILE_CURRENT);
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if (DWORD read{}; ReadFile(hFsDll.get(), &buf[0], static_cast<DWORD>(buf.size()), &read, nullptr)) {
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if (read < section.size_bytes()) {
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logging::W("{} ReadFile: read {} bytes < requested {} bytes", LogTagW, read, section.size_bytes());
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return;
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}
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} else {
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logging::I("{} ReadFile: Win32 error {}", LogTagW, GetLastError());
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return;
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}
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auto doRestore = false;
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for (const auto& targetDllName : targetDllNames) {
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if (0 == _wcsicmp(path.filename().wstring().c_str(), targetDllName.c_str())) {
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doRestore = true;
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break;
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}
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}
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std::optional<utils::memory_tenderizer> tenderizer;
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for (size_t i = 0, instructionLength = 1, printed = 0; i < buf.size(); i += instructionLength) {
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if (section[i] == buf[i]) {
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instructionLength = 1;
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continue;
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}
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const auto rva = sectionHeader.VirtualAddress + i;
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nmd_x86_instruction instruction{};
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if (!nmd_x86_decode(§ion[i], section.size() - i, &instruction, NMD_X86_MODE_64, NMD_X86_DECODER_FLAGS_ALL)) {
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instructionLength = 1;
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if (printed < 64) {
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logging::W("{} {}+0x{:0X}: dd {:02X}", LogTag, moduleName, rva, static_cast<uint8_t>(section[i]));
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printed++;
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}
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} else {
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instructionLength = instruction.length;
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if (printed < 64) {
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formatBuf.resize(128);
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nmd_x86_format(&instruction, &formatBuf[0], reinterpret_cast<size_t>(§ion[i]), NMD_X86_FORMAT_FLAGS_DEFAULT | NMD_X86_FORMAT_FLAGS_BYTES);
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formatBuf.resize(strnlen(&formatBuf[0], formatBuf.size()));
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const auto& directory = mod.data_directory(IMAGE_DIRECTORY_ENTRY_EXPORT);
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const auto& exportDirectory = mod.ref_as<IMAGE_EXPORT_DIRECTORY>(directory.VirtualAddress);
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const auto names = mod.span_as<DWORD>(exportDirectory.AddressOfNames, exportDirectory.NumberOfNames);
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const auto ordinals = mod.span_as<WORD>(exportDirectory.AddressOfNameOrdinals, exportDirectory.NumberOfNames);
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const auto functions = mod.span_as<DWORD>(exportDirectory.AddressOfFunctions, exportDirectory.NumberOfFunctions);
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std::string resolvedExportName;
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for (size_t j = 0; j < names.size(); ++j) {
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std::string_view name;
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if (const char* pcszName = mod.address_as<char>(names[j]); pcszName < mod.address() || pcszName >= mod.address() + mod.image_size()) {
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if (IsBadReadPtr(pcszName, 256)) {
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logging::W("{} Name #{} points to an invalid address outside the executable. Skipping.", LogTag, j);
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continue;
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}
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name = std::string_view(pcszName, strnlen(pcszName, 256));
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logging::W("{} Name #{} points to a seemingly valid address outside the executable: {}", LogTag, j, name);
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}
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if (ordinals[j] >= functions.size()) {
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logging::W("{} Ordinal #{} points to function index #{} >= #{}. Skipping.", LogTag, j, ordinals[j], functions.size());
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continue;
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}
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const auto rva = functions[ordinals[j]];
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if (rva == §ion[i] - mod.address()) {
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resolvedExportName = std::format("[export:{}]", name);
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break;
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}
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}
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logging::W("{} {}+0x{:0X}{}: {}", LogTag, moduleName, rva, resolvedExportName, formatBuf);
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printed++;
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}
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}
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if (doRestore) {
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if (!tenderizer)
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tenderizer.emplace(section, PAGE_EXECUTE_READWRITE);
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memcpy(§ion[i], &buf[i], instructionLength);
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}
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}
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if (tenderizer)
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logging::I("{} Verification and overwriting complete.", LogTag);
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else if (doRestore)
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logging::I("{} Verification complete. Overwriting was not required.", LogTag);
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} catch (const std::exception& e) {
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logging::W("{} Error: {}", LogTag, e.what());
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}
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};
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// This is needed since try and __try cannot be used in the same function. Lambdas circumvent the limitation.
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const auto windows_exception_handler = [&]() {
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for (size_t i = 0; i < mods.size(); i++) {
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const auto& mod = mods[i];
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__try {
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test_module(i, mod);
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} __except (EXCEPTION_EXECUTE_HANDLER) {
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logging::W("{} Error: Access Violation", LogTag);
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}
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}
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};
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windows_exception_handler();
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}
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using TFnGetInputDeviceManager = void* ();
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static TFnGetInputDeviceManager* GetGetInputDeviceManager(HWND hwnd) {
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static TFnGetInputDeviceManager* pCached = nullptr;
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if (pCached)
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return pCached;
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char szClassName[256];
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GetClassNameA(hwnd, szClassName, static_cast<int>(sizeof szClassName));
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WNDCLASSEXA wcx{};
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GetClassInfoExA(g_hGameInstance, szClassName, &wcx);
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const auto match = utils::signature_finder()
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.look_in(utils::loaded_module(g_hGameInstance), ".text")
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.look_for_hex("41 81 fe 19 02 00 00 0f 87 ?? ?? 00 00 0f 84 ?? ?? 00 00")
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.find_one();
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auto ptr = match.data() + match.size() + *reinterpret_cast<const int*>(match.data() + match.size() - 4);
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ptr += 4; // CMP RBX, 0x7
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ptr += 2; // JNZ <giveup>
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ptr += 7; // MOV RCX, <Framework::Instance>
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ptr += 3; // TEST RCX, RCX
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ptr += 2; // JZ <giveup>
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ptr += 5; // CALL <GetInputDeviceManagerInstance()>
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ptr += *reinterpret_cast<const int*>(ptr - 4);
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return pCached = reinterpret_cast<TFnGetInputDeviceManager*>(ptr);
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}
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void xivfixes::prevent_devicechange_crashes(bool bApply) {
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static const char* LogTag = "[xivfixes:prevent_devicechange_crashes]";
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static std::optional<hooks::import_hook<decltype(CreateWindowExA)>> s_hookCreateWindowExA;
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static std::optional<hooks::wndproc_hook> s_hookWndProc;
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if (bApply) {
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if (!bootconfig::gamefix_is_enabled(L"prevent_devicechange_crashes")) {
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logging::I("{} Turned off via environment variable.", LogTag);
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return;
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}
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s_hookCreateWindowExA.emplace("user32.dll!CreateWindowExA (prevent_devicechange_crashes)", "user32.dll", "CreateWindowExA", 0);
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s_hookCreateWindowExA->set_detour([](DWORD dwExStyle, LPCSTR lpClassName, LPCSTR lpWindowName, DWORD dwStyle, int X, int Y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam)->HWND {
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const auto hWnd = s_hookCreateWindowExA->call_original(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam);
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if (!hWnd
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|| hInstance != g_hGameInstance
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|| 0 != strcmp(lpClassName, "FFXIVGAME"))
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return hWnd;
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logging::I(R"({} CreateWindow(0x{:08X}, "{}", "{}", 0x{:08X}, {}, {}, {}, {}, 0x{:X}, 0x{:X}, 0x{:X}, 0x{:X}) called; unhooking CreateWindowExA and hooking WndProc.)",
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LogTag, dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, reinterpret_cast<size_t>(hWndParent), reinterpret_cast<size_t>(hMenu), reinterpret_cast<size_t>(hInstance), reinterpret_cast<size_t>(lpParam));
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s_hookWndProc.emplace("FFXIVGAME:WndProc (prevent_devicechange_crashes)", hWnd);
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s_hookWndProc->set_detour([](HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) -> LRESULT {
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if (uMsg == WM_CREATE) {
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s_hookCreateWindowExA.reset();
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} else if (uMsg == WM_DEVICECHANGE && wParam == DBT_DEVNODES_CHANGED) {
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if (!GetGetInputDeviceManager(hWnd)()) {
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logging::I("{} WndProc(0x{:X}, WM_DEVICECHANGE, DBT_DEVNODES_CHANGED, {}) called but the game does not have InputDeviceManager initialized; doing nothing.", LogTag, reinterpret_cast<size_t>(hWnd), lParam);
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return 0;
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}
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}
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return s_hookWndProc->call_original(hWnd, uMsg, wParam, lParam);
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});
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return hWnd;
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});
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logging::I("{} Enable", LogTag);
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} else {
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if (s_hookCreateWindowExA) {
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logging::I("{} Disable CreateWindowExA", LogTag);
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s_hookCreateWindowExA.reset();
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}
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// This will effectively revert any other WndProc alterations, including Dalamud.
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if (s_hookWndProc) {
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logging::I("{} Disable WndProc", LogTag);
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s_hookWndProc.reset();
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}
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}
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}
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static bool is_xivalex(const std::filesystem::path& dllPath) {
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DWORD verHandle = 0;
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std::vector<uint8_t> block;
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block.resize(GetFileVersionInfoSizeW(dllPath.c_str(), &verHandle));
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if (block.empty())
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return false;
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if (!GetFileVersionInfoW(dllPath.c_str(), 0, static_cast<DWORD>(block.size()), &block[0]))
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return false;
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struct LANGANDCODEPAGE {
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WORD wLanguage;
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WORD wCodePage;
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} * lpTranslate;
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UINT cbTranslate;
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if (!VerQueryValueW(&block[0],
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TEXT("\\VarFileInfo\\Translation"),
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reinterpret_cast<LPVOID*>(&lpTranslate),
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&cbTranslate)) {
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return false;
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}
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for (size_t i = 0; i < (cbTranslate / sizeof(struct LANGANDCODEPAGE)); i++) {
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wchar_t* buf = nullptr;
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UINT size = 0;
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if (!VerQueryValueW(&block[0],
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std::format(L"\\StringFileInfo\\{:04x}{:04x}\\FileDescription",
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lpTranslate[i].wLanguage,
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lpTranslate[i].wCodePage).c_str(),
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reinterpret_cast<LPVOID*>(&buf),
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&size)) {
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continue;
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}
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auto currName = std::wstring_view(buf, size);
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while (!currName.empty() && currName.back() == L'\0')
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currName = currName.substr(0, currName.size() - 1);
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if (currName.empty())
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continue;
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if (currName == L"XivAlexander Main DLL")
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return true;
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}
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return false;
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}
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static bool is_openprocess_already_dealt_with() {
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static const auto s_value = [] {
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for (const auto& mod : utils::loaded_module::all_modules()) {
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try {
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if (is_xivalex(mod.path()))
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return true;
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} catch (...) {
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// pass
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}
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}
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return false;
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}();
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return s_value;
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}
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void xivfixes::disable_game_openprocess_access_check(bool bApply) {
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static const char* LogTag = "[xivfixes:disable_game_openprocess_access_check]";
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static std::optional<hooks::import_hook<decltype(OpenProcess)>> s_hook;
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if (bApply) {
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if (!bootconfig::gamefix_is_enabled(L"disable_game_openprocess_access_check")) {
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logging::I("{} Turned off via environment variable.", LogTag);
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return;
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}
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if (is_openprocess_already_dealt_with()) {
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logging::I("{} Someone else already did it.", LogTag);
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return;
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}
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s_hook.emplace("kernel32.dll!OpenProcess (import, disable_game_openprocess_access_check)", "kernel32.dll", "OpenProcess", 0);
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s_hook->set_detour([](DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwProcessId)->HANDLE {
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logging::I("{} OpenProcess(0x{:08X}, {}, {}) was invoked by thread {}.", LogTag, dwDesiredAccess, bInheritHandle, dwProcessId, GetCurrentThreadId());
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if (dwProcessId == GetCurrentProcessId()) {
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// Prevent game from feeling unsafe that it restarts
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if (dwDesiredAccess & PROCESS_VM_WRITE) {
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logging::I("{} Returning failure with last error code set to ERROR_ACCESS_DENIED(5).", LogTag);
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SetLastError(ERROR_ACCESS_DENIED);
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return {};
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}
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}
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return s_hook->call_original(dwDesiredAccess, bInheritHandle, dwProcessId);
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});
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logging::I("{} Enable", LogTag);
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} else {
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if (s_hook) {
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logging::I("{} Disable OpenProcess", LogTag);
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s_hook.reset();
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}
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}
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}
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void xivfixes::redirect_openprocess(bool bApply) {
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static const char* LogTag = "[xivfixes:redirect_openprocess]";
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static std::shared_ptr<hooks::base_untyped_hook> s_hook;
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static std::mutex s_silenceSetMtx;
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static std::set<DWORD> s_silenceSet;
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if (bApply) {
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if (!bootconfig::gamefix_is_enabled(L"redirect_openprocess")) {
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logging::I("{} Turned off via environment variable.", LogTag);
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return;
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}
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if (is_openprocess_already_dealt_with()) {
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logging::I("{} Someone else already did it.", LogTag);
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return;
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}
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if (bootconfig::dotnet_openprocess_hook_mode() == bootconfig::ImportHooks) {
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auto hook = std::make_shared<hooks::global_import_hook<decltype(OpenProcess)>>("kernel32.dll!OpenProcess (global import, redirect_openprocess)", L"kernel32.dll", "OpenProcess");
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hook->set_detour([hook = hook.get()](DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwProcessId)->HANDLE {
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if (dwProcessId == GetCurrentProcessId()) {
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if (s_silenceSet.emplace(GetCurrentThreadId()).second)
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logging::I("{} OpenProcess(0x{:08X}, {}, {}) was invoked by thread {}. Redirecting to DuplicateHandle.", LogTag, dwDesiredAccess, bInheritHandle, dwProcessId, GetCurrentThreadId());
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if (HANDLE res; DuplicateHandle(GetCurrentProcess(), GetCurrentProcess(), GetCurrentProcess(), &res, dwDesiredAccess, bInheritHandle, 0))
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return res;
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return {};
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}
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return hook->call_original(dwDesiredAccess, bInheritHandle, dwProcessId);
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});
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s_hook = std::dynamic_pointer_cast<hooks::base_untyped_hook>(std::move(hook));
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logging::I("{} Enable via import_hook", LogTag);
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} else {
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auto hook = std::make_shared<hooks::direct_hook<decltype(OpenProcess)>>("kernel32.dll!OpenProcess (direct, redirect_openprocess)", OpenProcess);
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hook->set_detour([hook = hook.get()](DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwProcessId)->HANDLE {
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if (dwProcessId == GetCurrentProcessId()) {
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if (s_silenceSet.emplace(GetCurrentThreadId()).second)
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logging::I("{} OpenProcess(0x{:08X}, {}, {}) was invoked by thread {}. Redirecting to DuplicateHandle.", LogTag, dwDesiredAccess, bInheritHandle, dwProcessId, GetCurrentThreadId());
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if (HANDLE res; DuplicateHandle(GetCurrentProcess(), GetCurrentProcess(), GetCurrentProcess(), &res, dwDesiredAccess, bInheritHandle, 0))
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return res;
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return {};
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}
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return hook->call_original(dwDesiredAccess, bInheritHandle, dwProcessId);
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});
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s_hook = std::dynamic_pointer_cast<hooks::base_untyped_hook>(std::move(hook));
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logging::I("{} Enable via direct_hook", LogTag);
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}
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//std::thread([]() {
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// SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_IDLE);
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// for (const auto to = GetTickCount64() + 3000; GetTickCount64() < to;)
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// s_hook->assert_dominance();
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//}).detach();
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} else {
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if (s_hook) {
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logging::I("{} Disable OpenProcess", LogTag);
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s_hook.reset();
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}
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}
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}
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void xivfixes::apply_all(bool bApply) {
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for (const auto& [taskName, taskFunction] : std::initializer_list<std::pair<const char*, void(*)(bool)>>
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{
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{ "unhook_dll", &unhook_dll },
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{ "prevent_devicechange_crashes", &prevent_devicechange_crashes },
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{ "disable_game_openprocess_access_check", &disable_game_openprocess_access_check },
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{ "redirect_openprocess", &redirect_openprocess },
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}
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) {
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try {
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taskFunction(bApply);
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} catch (const std::exception& e) {
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if (bApply)
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logging::W("Error trying to activate fixup [{}]: {}", taskName, e.what());
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else
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logging::W("Error trying to deactivate fixup [{}]: {}", taskName, e.what());
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|
continue;
|
|
}
|
|
|
|
if (bApply)
|
|
logging::I("Fixup [{}] activated.", taskName);
|
|
else
|
|
logging::I("Fixup [{}] deactivated.", taskName);
|
|
}
|
|
}
|