151 lines
4.1 KiB
C++
151 lines
4.1 KiB
C++
//
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// openssl_init.hpp
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// ~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
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// Copyright (c) 2005-2008 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/push_options.hpp"
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#include "asio/detail/push_options.hpp"
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#include <vector>
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#include <boost/assert.hpp>
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#include <boost/config.hpp>
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#include <boost/shared_ptr.hpp>
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#include "asio/detail/pop_options.hpp"
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#include "asio/detail/mutex.hpp"
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#include "asio/detail/tss_ptr.hpp"
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#include "asio/ssl/detail/openssl_types.hpp"
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namespace asio {
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namespace ssl {
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namespace detail {
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template <bool Do_Init = true>
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class openssl_init
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: private boost::noncopyable
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{
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private:
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// Structure to perform the actual initialisation.
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class do_init
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{
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public:
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do_init()
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{
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if (Do_Init)
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{
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::SSL_library_init();
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::SSL_load_error_strings();
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::OpenSSL_add_ssl_algorithms();
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mutexes_.resize(::CRYPTO_num_locks());
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for (size_t i = 0; i < mutexes_.size(); ++i)
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mutexes_[i].reset(new asio::detail::mutex);
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::CRYPTO_set_locking_callback(&do_init::openssl_locking_func);
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::CRYPTO_set_id_callback(&do_init::openssl_id_func);
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}
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}
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~do_init()
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{
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if (Do_Init)
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{
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::CRYPTO_set_id_callback(0);
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::CRYPTO_set_locking_callback(0);
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::ERR_free_strings();
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::ERR_remove_state(0);
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::EVP_cleanup();
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::CRYPTO_cleanup_all_ex_data();
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::CONF_modules_unload(1);
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::ENGINE_cleanup();
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}
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}
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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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static boost::shared_ptr<do_init> instance()
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{
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static boost::shared_ptr<do_init> init(new do_init);
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return init;
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}
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private:
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static unsigned long openssl_id_func()
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{
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#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
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return ::GetCurrentThreadId();
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#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
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void* id = instance()->thread_id_;
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if (id == 0)
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instance()->thread_id_ = id = &id; // Ugh.
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BOOST_ASSERT(sizeof(unsigned long) >= sizeof(void*));
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return reinterpret_cast<unsigned long>(id);
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#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
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}
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static void openssl_locking_func(int mode, int n,
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const char *file, int line)
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{
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if (mode & CRYPTO_LOCK)
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instance()->mutexes_[n]->lock();
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else
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instance()->mutexes_[n]->unlock();
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}
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// Mutexes to be used in locking callbacks.
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std::vector<boost::shared_ptr<asio::detail::mutex> > mutexes_;
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#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
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// The thread identifiers to be used by openssl.
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asio::detail::tss_ptr<void> thread_id_;
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#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
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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_(do_init::instance())
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{
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while (&instance_ == 0); // Ensure openssl_init::instance_ is linked in.
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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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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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boost::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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#endif // ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
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