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/****************************************************************************
**
** Copyright (C) 2018 Pelagicore AG
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Pelagicore Application Manager.
**
** $QT_BEGIN_LICENSE:LGPL-QTAS$
** Commercial License Usage
** Licensees holding valid commercial Qt Automotive Suite licenses may use
** this file in accordance with the commercial license agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and The Qt Company. For
** licensing terms and conditions see https://www.qt.io/terms-conditions.
** For further information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
** SPDX-License-Identifier: LGPL-3.0
**
****************************************************************************/
#pragma once
#include <QString>
#include <QByteArray>
#include <QMutex>
#include <qplatformdefs.h>
#ifdef Q_OS_UNIX
# include <sys/types.h>
#else
typedef uint uid_t;
typedef uint gid_t;
//typedef uint mode_t; // already typedef'ed in qplatformdefs.h
#endif
#include <QtAppManCommon/global.h>
QT_BEGIN_NAMESPACE_AM
class Sudo
{
public:
enum DropPrivileges {
DropPrivilegesPermanently,
DropPrivilegesRegainable, // only use this for auto-tests
};
static void forkServer(DropPrivileges dropPrivileges, QStringList *warnings = nullptr) Q_DECL_NOEXCEPT_EXPR(false);
};
class SudoInterface
{
public:
virtual ~SudoInterface() = default;
virtual QString attachLoopback(const QString &imagePath, bool readonly) = 0;
virtual bool detachLoopback(const QString &loopDev) = 0;
virtual bool mount(const QString &device, const QString &mountPoint, bool readonly, const QString &fstype) = 0;
virtual bool unmount(const QString &mountPoint, bool force) = 0;
virtual bool mkfs(const QString &device, const QString &fstype, const QStringList &options) = 0;
virtual bool removeRecursive(const QString &fileOrDir) = 0;
virtual bool setOwnerAndPermissionsRecursive(const QString &fileOrDir, uid_t user, gid_t group, mode_t permissions) = 0;
protected:
enum MessageType { Request, Reply };
#ifdef Q_OS_LINUX
QByteArray receiveMessage(int socket, MessageType type, QString *errorString);
bool sendMessage(int socket, const QByteArray &msg, MessageType type, const QString &errorString = QString());
#endif
QByteArray receive(const QByteArray &packet);
protected:
SudoInterface();
private:
Q_DISABLE_COPY(SudoInterface)
};
class SudoServer;
class SudoClient : public SudoInterface
{
public:
static SudoClient *createInstance(int socketFd, SudoServer *shortCircuit = 0);
static SudoClient *instance();
bool isFallbackImplementation() const;
QString attachLoopback(const QString &imagePath, bool readonly = false) override;
bool detachLoopback(const QString &loopDev) override;
bool mount(const QString &device, const QString &mountPoint, bool readonly = false, const QString &fstype = QStringLiteral("ext2")) override;
bool unmount(const QString &mountPoint, bool force = false) override;
bool mkfs(const QString &device, const QString &fstype = QStringLiteral("ext2"), const QStringList &options = QStringList()) override;
bool removeRecursive(const QString &fileOrDir) override;
bool setOwnerAndPermissionsRecursive(const QString &fileOrDir, uid_t user, gid_t group, mode_t permissions) override;
void stopServer();
QString lastError() const { return m_errorString; }
private:
SudoClient(int socketFd);
QByteArray call(const QByteArray &msg);
int m_socket;
QString m_errorString;
QMutex m_mutex;
SudoServer *m_shortCircuit;
static SudoClient *s_instance;
};
class SudoServer : public SudoInterface
{
public:
static SudoServer *createInstance(int socketFd, int loopControlFd);
static SudoServer *instance();
QString attachLoopback(const QString &imagePath, bool readonly) override;
bool detachLoopback(const QString &loopDev) override;
bool mount(const QString &device, const QString &mountPoint, bool readonly, const QString &fstype) override;
bool unmount(const QString &mountPoint, bool force) override;
bool mkfs(const QString &device, const QString &fstype, const QStringList &options) override;
bool removeRecursive(const QString &fileOrDir) override;
bool setOwnerAndPermissionsRecursive(const QString &fileOrDir, uid_t user, gid_t group, mode_t permissions) override;
QString lastError() const { return m_errorString; }
Q_NORETURN void run();
private:
SudoServer(int socketFd, int loopControlFd);
QByteArray receive(const QByteArray &msg);
friend class SudoClient;
int m_socket;
int m_loopControl;
QString m_errorString;
bool m_stop = false;
static SudoServer *s_instance;
};
QT_END_NAMESPACE_AM
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