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/*
* Copyright (c) 2017-2020 Samsung Electronics Co., Ltd. All rights reserved.
*
* This file is licensed under the terms of MIT License or the Apache License
* Version 2.0 of your choice. See the LICENSE.MIT file for MIT license details.
* See the LICENSE file or the notice below for Apache License Version 2.0
* details.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* @file mount-monitor.h
* @author Rafal Krypa <r.krypa@samsung.com>
* @version 1.0
* @brief Monitor mount/umount events
*/
#pragma once
#include <libmount.h>
#include <atomic>
#include <functional>
#include <mutex>
#include <string>
#include <thread>
#include <vector>
namespace SecurityManager {
class MntFS {
public:
MntFS(const libmnt_fs *fs);
~MntFS();
MntFS(const MntFS &) = delete;
MntFS(MntFS &&other);
MntFS & operator=(const MntFS &) = delete;
MntFS && operator=(MntFS &&other);
std::string getSource() const;
std::string getTarget() const;
private:
struct libmnt_fs *m_fs = nullptr;
};
class MntDiffEntry
{
public:
enum class Type {
MOUNT = MNT_TABDIFF_MOUNT,
UMOUNT = MNT_TABDIFF_UMOUNT,
MOVE = MNT_TABDIFF_MOVE,
REMOUNT = MNT_TABDIFF_REMOUNT
};
Type m_type;
MntFS m_oldFS, m_newFS;
MntDiffEntry(int type, const libmnt_fs *oldFS, const libmnt_fs *newFS) :
m_type(static_cast<Type>(type)), m_oldFS(oldFS), m_newFS(newFS)
{}
};
class MntTable {
public:
MntTable(const std::string &file = "/proc/self/mountinfo");
~MntTable();
MntTable(const MntTable &) = delete;
MntTable(MntTable &&other);
MntTable & operator=(const MntTable &) = delete;
MntTable & operator=(MntTable &&other);
std::vector<MntDiffEntry> diff(const MntTable &other);
private:
libmnt_table *m_table = nullptr;
};
class MntMonitor
{
public:
MntMonitor(const std::function<void(MntDiffEntry &)> &callback);
~MntMonitor();
private:
void threadNotifyPut();
void threadNotifyGet();
void run();
MntTable m_table;
struct libmnt_monitor *m_monitor;
int m_monitorFd;
std::function<void(MntDiffEntry &)> m_callback;
std::mutex m_monitorMut;
std::thread m_thread;
std::atomic<bool> m_terminate;
const int m_eventFd;
};
} // namespace SecurityManager
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