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+//
+// ssl/detail/engine.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_ENGINE_HPP
+#define ASIO_SSL_DETAIL_ENGINE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/detail/static_mutex.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+#include "asio/ssl/detail/verify_callback.hpp"
+#include "asio/ssl/stream_base.hpp"
+#include "asio/ssl/verify_mode.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class engine
+{
+public:
+ enum want
+ {
+ // Returned by functions to indicate that the engine wants input. The input
+ // buffer should be updated to point to the data. The engine then needs to
+ // be called again to retry the operation.
+ want_input_and_retry = -2,
+
+ // Returned by functions to indicate that the engine wants to write output.
+ // The output buffer points to the data to be written. The engine then
+ // needs to be called again to retry the operation.
+ want_output_and_retry = -1,
+
+ // Returned by functions to indicate that the engine doesn't need input or
+ // output.
+ want_nothing = 0,
+
+ // Returned by functions to indicate that the engine wants to write output.
+ // The output buffer points to the data to be written. After that the
+ // operation is complete, and the engine does not need to be called again.
+ want_output = 1
+ };
+
+ // Construct a new engine for the specified context.
+ ASIO_DECL explicit engine(SSL_CTX* context);
+
+#if defined(ASIO_HAS_MOVE)
+ // Move construct from another engine.
+ ASIO_DECL engine(engine&& other) ASIO_NOEXCEPT;
+#endif // defined(ASIO_HAS_MOVE)
+
+ // Destructor.
+ ASIO_DECL ~engine();
+
+#if defined(ASIO_HAS_MOVE)
+ // Move assign from another engine.
+ ASIO_DECL engine& operator=(engine&& other) ASIO_NOEXCEPT;
+#endif // defined(ASIO_HAS_MOVE)
+
+ // Get the underlying implementation in the native type.
+ ASIO_DECL SSL* native_handle();
+
+ // Set the peer verification mode.
+ ASIO_DECL asio::error_code set_verify_mode(
+ verify_mode v, asio::error_code& ec);
+
+ // Set the peer verification depth.
+ ASIO_DECL asio::error_code set_verify_depth(
+ int depth, asio::error_code& ec);
+
+ // Set a peer certificate verification callback.
+ ASIO_DECL asio::error_code set_verify_callback(
+ verify_callback_base* callback, asio::error_code& ec);
+
+ // Perform an SSL handshake using either SSL_connect (client-side) or
+ // SSL_accept (server-side).
+ ASIO_DECL want handshake(
+ stream_base::handshake_type type, asio::error_code& ec);
+
+ // Perform a graceful shutdown of the SSL session.
+ ASIO_DECL want shutdown(asio::error_code& ec);
+
+ // Write bytes to the SSL session.
+ ASIO_DECL want write(const asio::const_buffer& data,
+ asio::error_code& ec, std::size_t& bytes_transferred);
+
+ // Read bytes from the SSL session.
+ ASIO_DECL want read(const asio::mutable_buffer& data,
+ asio::error_code& ec, std::size_t& bytes_transferred);
+
+ // Get output data to be written to the transport.
+ ASIO_DECL asio::mutable_buffer get_output(
+ const asio::mutable_buffer& data);
+
+ // Put input data that was read from the transport.
+ ASIO_DECL asio::const_buffer put_input(
+ const asio::const_buffer& data);
+
+ // Map an error::eof code returned by the underlying transport according to
+ // the type and state of the SSL session. Returns a const reference to the
+ // error code object, suitable for passing to a completion handler.
+ ASIO_DECL const asio::error_code& map_error_code(
+ asio::error_code& ec) const;
+
+private:
+ // Disallow copying and assignment.
+ engine(const engine&);
+ engine& operator=(const engine&);
+
+ // Callback used when the SSL implementation wants to verify a certificate.
+ ASIO_DECL static int verify_callback_function(
+ int preverified, X509_STORE_CTX* ctx);
+
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+ // The SSL_accept function may not be thread safe. This mutex is used to
+ // protect all calls to the SSL_accept function.
+ ASIO_DECL static asio::detail::static_mutex& accept_mutex();
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+
+ // Perform one operation. Returns >= 0 on success or error, want_read if the
+ // operation needs more input, or want_write if it needs to write some output
+ // before the operation can complete.
+ ASIO_DECL want perform(int (engine::* op)(void*, std::size_t),
+ void* data, std::size_t length, asio::error_code& ec,
+ std::size_t* bytes_transferred);
+
+ // Adapt the SSL_accept function to the signature needed for perform().
+ ASIO_DECL int do_accept(void*, std::size_t);
+
+ // Adapt the SSL_connect function to the signature needed for perform().
+ ASIO_DECL int do_connect(void*, std::size_t);
+
+ // Adapt the SSL_shutdown function to the signature needed for perform().
+ ASIO_DECL int do_shutdown(void*, std::size_t);
+
+ // Adapt the SSL_read function to the signature needed for perform().
+ ASIO_DECL int do_read(void* data, std::size_t length);
+
+ // Adapt the SSL_write function to the signature needed for perform().
+ ASIO_DECL int do_write(void* data, std::size_t length);
+
+ SSL* ssl_;
+ BIO* ext_bio_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ssl/detail/impl/engine.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_SSL_DETAIL_ENGINE_HPP