mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 20:13:05 +02:00
3fbe0a2701
Signed-off-by: David Sommerseth <davids@openvpn.net>
169 lines
4.1 KiB
C++
169 lines
4.1 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) 2012-2020 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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// This is a general-purpose logging framework that allows for OPENVPN_LOG and
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// OPENVPN_LOG_NTNL macros to dispatch logging data to a thread-local handler.
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// NOTE: define USE_ASIO_THREADLOCAL if your C++ doesn't support the
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// "thread_local" attribute.
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#ifndef OPENVPN_LOG_LOGTHREAD_H
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#define OPENVPN_LOG_LOGTHREAD_H
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#include <string>
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#include <sstream>
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#include <thread>
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#if defined(USE_ASIO) && defined(USE_ASIO_THREADLOCAL)
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#include <asio/detail/tss_ptr.hpp>
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#endif
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/extern.hpp>
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// Define these parameters before including this header:
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// OPENVPN_LOG_CLASS -- client class that exposes a log() method
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// OPENVPN_LOG_INFO -- converts a log string to the form that should be passed to log()
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#ifndef OPENVPN_LOG_CLASS
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#error OPENVPN_LOG_CLASS must be defined
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#endif
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#ifndef OPENVPN_LOG_INFO
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#error OPENVPN_LOG_INFO must be defined
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#endif
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# define OPENVPN_LOG(args) \
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do { \
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if (openvpn::Log::Context::defined()) { \
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std::ostringstream _ovpn_log; \
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_ovpn_log << args << '\n'; \
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(openvpn::Log::Context::obj()->log(OPENVPN_LOG_INFO(_ovpn_log.str()))); \
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} \
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} while (0)
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// like OPENVPN_LOG but no trailing newline
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#define OPENVPN_LOG_NTNL(args) \
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do { \
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if (openvpn::Log::Context::defined()) { \
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std::ostringstream _ovpn_log; \
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_ovpn_log << args; \
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(openvpn::Log::Context::obj()->log(OPENVPN_LOG_INFO(_ovpn_log.str()))); \
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} \
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} while (0)
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# define OPENVPN_LOG_STRING(str) \
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do { \
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if (openvpn::Log::Context::defined()) { \
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(openvpn::Log::Context::obj()->log(OPENVPN_LOG_INFO(str))); \
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} \
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} while (0)
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namespace openvpn {
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namespace Log {
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#ifdef OPENVPN_LOG_GLOBAL
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// OPENVPN_LOG uses global object pointer
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OPENVPN_EXTERN OPENVPN_LOG_CLASS* global_log; // GLOBAL
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struct Context
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{
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struct Wrapper
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{
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};
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Context(const Wrapper& wrap)
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{
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}
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Context(OPENVPN_LOG_CLASS *cli)
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{
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global_log = cli;
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}
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~Context()
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{
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global_log = nullptr;
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}
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static bool defined()
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{
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return global_log != nullptr;
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}
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static OPENVPN_LOG_CLASS* obj()
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{
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return global_log;
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}
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};
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#else
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// OPENVPN_LOG uses thread-local object pointer
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#if defined(USE_ASIO) && defined(USE_ASIO_THREADLOCAL)
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OPENVPN_EXTERN asio::detail::tss_ptr<OPENVPN_LOG_CLASS> global_log; // GLOBAL
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#else
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OPENVPN_EXTERN thread_local OPENVPN_LOG_CLASS* global_log; // GLOBAL
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#endif
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struct Context
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{
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// Mechanism for passing thread-local
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// global_log to another thread.
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class Wrapper
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{
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public:
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Wrapper() : log(obj()) {}
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private:
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friend struct Context;
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OPENVPN_LOG_CLASS *log;
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};
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// While in scope, turns on global_log
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// for this thread.
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Context(const Wrapper& wrap)
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{
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global_log = wrap.log;
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}
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Context(OPENVPN_LOG_CLASS *cli)
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{
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global_log = cli;
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}
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~Context()
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{
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global_log = nullptr;
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}
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static bool defined()
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{
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return global_log != nullptr;
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}
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static OPENVPN_LOG_CLASS* obj()
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{
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return global_log;
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}
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};
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#endif
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}
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}
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#endif
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