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124 lines
3.9 KiB
C++
124 lines
3.9 KiB
C++
/*
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Copyright 2021-2023 Peter Repukat - FlatspotSoftware
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "../common/UnhookUtil.h"
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#include "util.h"
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#ifndef CONFIGAPP
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#define SPDLOG_WCHAR_TO_UTF8_SUPPORT
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#define SPDLOG_WCHAR_FILENAMES
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#include <spdlog/spdlog.h>
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#include "Settings.h"
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#endif
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void UnhookUtil::UnPatchHook(const std::string& name, HMODULE module)
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{
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#ifndef CONFIGAPP
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std::map<std::string, std::string> original_bytes_from_file;
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auto configDirPath = util::path::getDataDirPath();
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if (std::filesystem::exists(configDirPath)) {
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auto unhook_file_path = configDirPath / "unhook_bytes";
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if (std::filesystem::exists(unhook_file_path)) {
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std::ifstream ifile;
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ifile.open(unhook_file_path, std::ios::binary | std::ios::in);
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if (ifile.is_open()) {
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std::string funcName;
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char buff;
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do {
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if (ifile.eof()) {
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break;
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}
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ifile.read(&buff, sizeof(char));
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if (buff != ':') {
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funcName.push_back(buff);
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}
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else {
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char bytes[8];
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ifile.read(bytes, sizeof(char) * 8);
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ifile.read(&buff, sizeof(char)); // newline
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original_bytes_from_file[funcName] = std::string(bytes, 8);
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funcName = "";
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}
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} while (!ifile.eof());
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ifile.close();
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}
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}
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}
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spdlog::trace("Patching \"{}\"...", name);
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BYTE* address = reinterpret_cast<BYTE*>(GetProcAddress(module, name.c_str()));
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if (!address) {
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spdlog::error("failed to unpatch \"{}\"", name);
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}
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std::string bytes;
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if (original_bytes_from_file.contains(name)) {
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bytes = original_bytes_from_file.at(name);
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spdlog::trace("Using originalBytes from file for {}", name);
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}
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else {
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if (Settings::isWin10 && UNHOOK_BYTES_ORIGINAL_WIN10.contains(name)) {
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bytes = UNHOOK_BYTES_ORIGINAL_WIN10.at(name);
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}
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else {
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bytes = UNHOOK_BYTES_ORIGINAL_22000.at(name);
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}
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spdlog::trace("Using fallback originalBytes for {}", name);
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}
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DWORD dw_old_protect, dw_bkup;
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const auto len = bytes.size();
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if (!VirtualProtect(address, len, PAGE_EXECUTE_READWRITE, &dw_old_protect)) { // Change permissions of memory..
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spdlog::error("Couldn't change permissions of memory for \"{}\"", name);
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return;
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}
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const auto opcode = *(address);
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if (!std::ranges::any_of(JUMP_INSTR_OPCODES, [&opcode](const auto& op) { return op == opcode; })) {
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spdlog::debug("\"{}\" Doesn't appear to be hooked, skipping!", name);
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}
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else {
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for (DWORD i = 0; i < len; i++) // unpatch Valve's hook
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{
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*(address + i) = bytes[i];
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}
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spdlog::trace("Unpatched \"{}\"", name);
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}
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VirtualProtect(address, len, dw_old_protect, &dw_bkup); // Revert permission change...
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#endif
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}
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std::string UnhookUtil::ReadOriginalBytes(const std::string& name, const std::wstring& moduleName)
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{
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auto module = LoadLibraryW(moduleName.c_str());
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auto address = reinterpret_cast<BYTE*>(GetProcAddress(module, name.c_str()));
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std::string res;
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res.resize(8);
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for (int i = 0; i < 8; i++) {
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res[i] = static_cast<char>(*(address + i));
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}
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return res;
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}
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