| // |
| // ssl/detail/openssl_init.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com |
| // Copyright (c) 2005-2010 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 BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP |
| #define BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/config.hpp> |
| #include <cstring> |
| #include <vector> |
| #include <boost/assert.hpp> |
| #include <boost/shared_ptr.hpp> |
| #include <boost/asio/detail/mutex.hpp> |
| #include <boost/asio/detail/tss_ptr.hpp> |
| #include <boost/asio/ssl/detail/openssl_types.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace ssl { |
| namespace detail { |
| |
| template <bool Do_Init = true> |
| class openssl_init |
| : private boost::noncopyable |
| { |
| private: |
| // Structure to perform the actual initialisation. |
| class do_init |
| { |
| public: |
| do_init() |
| { |
| if (Do_Init) |
| { |
| ::SSL_library_init(); |
| ::SSL_load_error_strings(); |
| ::OpenSSL_add_ssl_algorithms(); |
| |
| mutexes_.resize(::CRYPTO_num_locks()); |
| for (size_t i = 0; i < mutexes_.size(); ++i) |
| mutexes_[i].reset(new boost::asio::detail::mutex); |
| ::CRYPTO_set_locking_callback(&do_init::openssl_locking_func); |
| ::CRYPTO_set_id_callback(&do_init::openssl_id_func); |
| } |
| } |
| |
| ~do_init() |
| { |
| if (Do_Init) |
| { |
| ::CRYPTO_set_id_callback(0); |
| ::CRYPTO_set_locking_callback(0); |
| ::ERR_free_strings(); |
| ::ERR_remove_state(0); |
| ::EVP_cleanup(); |
| ::CRYPTO_cleanup_all_ex_data(); |
| ::CONF_modules_unload(1); |
| ::ENGINE_cleanup(); |
| } |
| } |
| |
| // 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. |
| static boost::shared_ptr<do_init> instance() |
| { |
| static boost::shared_ptr<do_init> init(new do_init); |
| return init; |
| } |
| |
| private: |
| static unsigned long openssl_id_func() |
| { |
| #if defined(BOOST_WINDOWS) || defined(__CYGWIN__) |
| return ::GetCurrentThreadId(); |
| #else // defined(BOOST_WINDOWS) || defined(__CYGWIN__) |
| void* id = instance()->thread_id_; |
| if (id == 0) |
| instance()->thread_id_ = id = &id; // Ugh. |
| BOOST_ASSERT(sizeof(unsigned long) >= sizeof(void*)); |
| return reinterpret_cast<unsigned long>(id); |
| #endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__) |
| } |
| |
| static void openssl_locking_func(int mode, int n, |
| const char* /*file*/, int /*line*/) |
| { |
| if (mode & CRYPTO_LOCK) |
| instance()->mutexes_[n]->lock(); |
| else |
| instance()->mutexes_[n]->unlock(); |
| } |
| |
| // Mutexes to be used in locking callbacks. |
| std::vector<boost::shared_ptr<boost::asio::detail::mutex> > mutexes_; |
| |
| #if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__) |
| // The thread identifiers to be used by openssl. |
| boost::asio::detail::tss_ptr<void> thread_id_; |
| #endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__) |
| }; |
| |
| public: |
| // Constructor. |
| openssl_init() |
| : ref_(do_init::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() |
| { |
| } |
| |
| 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. |
| boost::shared_ptr<do_init> ref_; |
| }; |
| |
| template <bool Do_Init> |
| openssl_init<Do_Init> openssl_init<Do_Init>::instance_; |
| |
| } // namespace detail |
| } // namespace ssl |
| } // namespace asio |
| } // namespace boost |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP |