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/*
Userspace Virtual Filesystem
Copyright (C) 2015 Sebastian Herbord. All rights reserved.
This file is part of usvfs.
usvfs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
usvfs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with usvfs. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "hookcontext.h"
#include <hooklib.h>
#include <usvfsparameters.h>
namespace usvfs
{
class HookManager
{
public:
HookManager(const usvfsParameters& params, HMODULE module);
~HookManager();
HookManager(const HookManager& reference) = delete;
HookManager& operator=(const HookManager& reference) = delete;
static HookManager& instance();
HookContext* context() { return &m_Context; }
///
/// \brief retrieve address of the detour of a function
/// \param functionName name of the function to look up
/// \return function address that can be used to directly execute the original code
///
LPVOID detour(const char* functionName);
///
/// \brief remove the hook on the specified function.
/// \param functionName name of the function to unhook
/// \note This function is only exposed to allow a workaround for ExitProcess and may
/// be
/// removed if a better solution is found there. If you have another legit use
/// case, please let me know!
///
void removeHook(const std::string& functionName);
private:
void logStubInt(LPVOID address);
static void logStub(LPVOID address);
void installHook(HMODULE module1, HMODULE module2, const std::string& functionName,
LPVOID hook, LPVOID* fillFuncAddr);
void installStub(HMODULE module1, HMODULE module2, const std::string& functionName);
void initHooks();
void removeHooks();
private:
static HookManager* s_Instance;
std::map<std::string, HookLib::HOOKHANDLE> m_Hooks;
std::map<LPVOID, std::string> m_Stubs;
HookContext m_Context;
};
} // namespace usvfs
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