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56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
/*
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Copyright 2021-2022 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 "UnhookUtil.h"
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#include <spdlog/spdlog.h>
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#include "Settings.h"
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void UnhookUtil::UnPatchHook(const std::string& name, HMODULE module)
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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 (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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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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}
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