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1 | // |
2 | // ssl/detail/openssl_init.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP | |
12 | #define BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP | |
13 | ||
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | #include <cstring> | |
20 | #include <boost/asio/detail/noncopyable.hpp> | |
21 | #include <boost/asio/detail/shared_ptr.hpp> | |
22 | #include <boost/asio/ssl/detail/openssl_types.hpp> | |
23 | ||
24 | #include <boost/asio/detail/push_options.hpp> | |
25 | ||
26 | namespace boost { | |
27 | namespace asio { | |
28 | namespace ssl { | |
29 | namespace detail { | |
30 | ||
31 | class openssl_init_base | |
32 | : private noncopyable | |
33 | { | |
34 | protected: | |
35 | // Class that performs the actual initialisation. | |
36 | class do_init; | |
37 | ||
38 | // Helper function to manage a do_init singleton. The static instance of the | |
39 | // openssl_init object ensures that this function is always called before | |
40 | // main, and therefore before any other threads can get started. The do_init | |
41 | // instance must be static in this function to ensure that it gets | |
42 | // initialised before any other global objects try to use it. | |
43 | BOOST_ASIO_DECL static boost::asio::detail::shared_ptr<do_init> instance(); | |
44 | ||
45 | #if !defined(SSL_OP_NO_COMPRESSION) \ | |
46 | && (OPENSSL_VERSION_NUMBER >= 0x00908000L) | |
47 | // Get an empty stack of compression methods, to be used when disabling | |
48 | // compression. | |
49 | BOOST_ASIO_DECL static STACK_OF(SSL_COMP)* get_null_compression_methods(); | |
50 | #endif // !defined(SSL_OP_NO_COMPRESSION) | |
51 | // && (OPENSSL_VERSION_NUMBER >= 0x00908000L) | |
52 | }; | |
53 | ||
54 | template <bool Do_Init = true> | |
55 | class openssl_init : private openssl_init_base | |
56 | { | |
57 | public: | |
58 | // Constructor. | |
59 | openssl_init() | |
60 | : ref_(instance()) | |
61 | { | |
62 | using namespace std; // For memmove. | |
63 | ||
64 | // Ensure openssl_init::instance_ is linked in. | |
65 | openssl_init* tmp = &instance_; | |
66 | memmove(&tmp, &tmp, sizeof(openssl_init*)); | |
67 | } | |
68 | ||
69 | // Destructor. | |
70 | ~openssl_init() | |
71 | { | |
72 | } | |
73 | ||
74 | #if !defined(SSL_OP_NO_COMPRESSION) \ | |
75 | && (OPENSSL_VERSION_NUMBER >= 0x00908000L) | |
76 | using openssl_init_base::get_null_compression_methods; | |
77 | #endif // !defined(SSL_OP_NO_COMPRESSION) | |
78 | // && (OPENSSL_VERSION_NUMBER >= 0x00908000L) | |
79 | ||
80 | private: | |
81 | // Instance to force initialisation of openssl at global scope. | |
82 | static openssl_init instance_; | |
83 | ||
84 | // Reference to singleton do_init object to ensure that openssl does not get | |
85 | // cleaned up until the last user has finished with it. | |
86 | boost::asio::detail::shared_ptr<do_init> ref_; | |
87 | }; | |
88 | ||
89 | template <bool Do_Init> | |
90 | openssl_init<Do_Init> openssl_init<Do_Init>::instance_; | |
91 | ||
92 | } // namespace detail | |
93 | } // namespace ssl | |
94 | } // namespace asio | |
95 | } // namespace boost | |
96 | ||
97 | #include <boost/asio/detail/pop_options.hpp> | |
98 | ||
99 | #if defined(BOOST_ASIO_HEADER_ONLY) | |
100 | # include <boost/asio/ssl/detail/impl/openssl_init.ipp> | |
101 | #endif // defined(BOOST_ASIO_HEADER_ONLY) | |
102 | ||
103 | #endif // BOOST_ASIO_SSL_DETAIL_OPENSSL_INIT_HPP |