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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#ifndef OPENVPN_COMMON_ACTIONTHREAD_H
#define OPENVPN_COMMON_ACTIONTHREAD_H
#include <thread>
#include <openvpn/common/rc.hpp>
#include <openvpn/common/action.hpp>
#include <openvpn/log/logthread.hpp>
namespace openvpn {
class ActionThread : public RC<thread_safe_refcount>
{
public:
typedef RCPtr<ActionThread> Ptr;
struct Notify
{
virtual void action_thread_finished(const ActionThread *self, bool status) = 0;
};
ActionThread(openvpn_io::io_context &io_context_arg,
const ActionList::Ptr &action_list,
Notify *completion_handler_arg)
: io_context(io_context_arg),
thread(nullptr),
actions(action_list),
completion_handler(completion_handler_arg)
{
if (actions)
thread = new std::thread(&ActionThread::thread_func, this);
}
void stop(const bool halt)
{
if (thread)
{
if (halt)
actions->halt();
thread->join();
delete thread;
thread = nullptr;
// Necessary because no guarantee that completion_handler
// obj will remain in scope during io_context.post delay.
completion_handler = nullptr;
}
}
virtual ~ActionThread()
{
stop(true);
}
private:
void completion_post(bool status)
{
Notify *n = completion_handler;
completion_handler = nullptr;
if (n)
n->action_thread_finished(this, status);
}
void thread_func()
{
Log::Context logctx(logwrap);
bool status = false;
try
{
OPENVPN_LOG("START THREAD...");
status = actions->execute();
OPENVPN_LOG("END THREAD");
}
catch (const std::exception &e)
{
OPENVPN_LOG("ActionThread exception: " << e.what());
}
openvpn_io::post(io_context, [self = Ptr(this), status]()
{ self->completion_post(status); });
}
openvpn_io::io_context &io_context;
std::thread *thread;
ActionList::Ptr actions; // actions to execute in child thread
Notify *completion_handler; // completion handler
Log::Context::Wrapper logwrap; // used to carry forward the log context from parent thread
};
} // namespace openvpn
#endif
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