102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
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//
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// ssl/detail/openssl_init.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
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#define ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include <cstring>
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#include "asio/detail/memory.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/ssl/detail/openssl_types.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace ssl {
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namespace detail {
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class openssl_init_base
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: private noncopyable
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{
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protected:
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// Class that performs the actual initialisation.
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class do_init;
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// Helper function to manage a do_init singleton. The static instance of the
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// openssl_init object ensures that this function is always called before
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// main, and therefore before any other threads can get started. The do_init
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// instance must be static in this function to ensure that it gets
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// initialised before any other global objects try to use it.
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ASIO_DECL static asio::detail::shared_ptr<do_init> instance();
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#if !defined(SSL_OP_NO_COMPRESSION) \
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&& (OPENSSL_VERSION_NUMBER >= 0x00908000L)
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// Get an empty stack of compression methods, to be used when disabling
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// compression.
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ASIO_DECL static STACK_OF(SSL_COMP)* get_null_compression_methods();
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#endif // !defined(SSL_OP_NO_COMPRESSION)
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// && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
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};
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template <bool Do_Init = true>
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class openssl_init : private openssl_init_base
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{
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public:
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// Constructor.
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openssl_init()
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: ref_(instance())
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{
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using namespace std; // For memmove.
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// Ensure openssl_init::instance_ is linked in.
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openssl_init* tmp = &instance_;
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memmove(&tmp, &tmp, sizeof(openssl_init*));
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}
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// Destructor.
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~openssl_init()
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{
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}
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#if !defined(SSL_OP_NO_COMPRESSION) \
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&& (OPENSSL_VERSION_NUMBER >= 0x00908000L)
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using openssl_init_base::get_null_compression_methods;
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#endif // !defined(SSL_OP_NO_COMPRESSION)
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// && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
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private:
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// Instance to force initialisation of openssl at global scope.
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static openssl_init instance_;
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// Reference to singleton do_init object to ensure that openssl does not get
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// cleaned up until the last user has finished with it.
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asio::detail::shared_ptr<do_init> ref_;
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};
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template <bool Do_Init>
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openssl_init<Do_Init> openssl_init<Do_Init>::instance_;
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} // namespace detail
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} // namespace ssl
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#if defined(ASIO_HEADER_ONLY)
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# include "asio/ssl/detail/impl/openssl_init.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
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