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