mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 04:02:15 +02:00
96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2022 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// Process-wide static initialization
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#pragma once
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#include <thread>
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#include <mutex>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/base64.hpp>
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#include <openvpn/time/time.hpp>
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#include <openvpn/compress/compress.hpp>
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#include <openvpn/init/cryptoinit.hpp>
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#include <openvpn/init/engineinit.hpp>
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namespace openvpn::InitProcess {
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class Init
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{
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private:
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class InitImpl
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{
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public:
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InitImpl()
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{
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// initialize time base
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Time::reset_base();
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// initialize compression
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CompressContext::init_static();
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// init OpenSSL if included
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init_openssl("auto");
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base64_init_static();
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}
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~InitImpl()
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{
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base64_uninit_static();
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}
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private:
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// SSL library init happens when instantiated
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crypto_init crypto_init_;
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};
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// process-wide singular instance
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inline static std::weak_ptr<InitImpl> init_instance; // GLOBAL
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inline static std::mutex the_instance_mutex; // GLOBAL
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// istance of this class to refcount
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std::shared_ptr<InitImpl> initptr;
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public:
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Init()
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{
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std::lock_guard<std::mutex> lock(the_instance_mutex);
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initptr = init_instance.lock();
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if (!initptr)
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{
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initptr = std::make_shared<InitImpl>();
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init_instance = initptr;
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}
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}
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~Init()
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{
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// explicitly reset smart pointer to make the destructor run under the lock_guard
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std::lock_guard<std::mutex> lock(the_instance_mutex);
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initptr.reset();
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}
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};
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} // namespace openvpn::InitProcess
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