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//
// ssl/detail/stream_core.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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_STREAM_CORE_HPP
#define ASIO_SSL_DETAIL_STREAM_CORE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_HAS_BOOST_DATE_TIME)
# include "asio/deadline_timer.hpp"
#else // defined(ASIO_HAS_BOOST_DATE_TIME)
# include "asio/steady_timer.hpp"
#endif // defined(ASIO_HAS_BOOST_DATE_TIME)
#include "asio/ssl/detail/engine.hpp"
#include "asio/buffer.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace ssl {
namespace detail {
struct stream_core
{
// According to the OpenSSL documentation, this is the buffer size that is
// sufficient to hold the largest possible TLS record.
enum { max_tls_record_size = 17 * 1024 };
stream_core(SSL_CTX* context, asio::io_context& io_context)
: engine_(context),
pending_read_(io_context),
pending_write_(io_context),
output_buffer_space_(max_tls_record_size),
output_buffer_(asio::buffer(output_buffer_space_)),
input_buffer_space_(max_tls_record_size),
input_buffer_(asio::buffer(input_buffer_space_))
{
pending_read_.expires_at(neg_infin());
pending_write_.expires_at(neg_infin());
}
~stream_core()
{
}
// The SSL engine.
engine engine_;
#if defined(ASIO_HAS_BOOST_DATE_TIME)
// Timer used for storing queued read operations.
asio::deadline_timer pending_read_;
// Timer used for storing queued write operations.
asio::deadline_timer pending_write_;
// Helper function for obtaining a time value that always fires.
static asio::deadline_timer::time_type neg_infin()
{
return boost::posix_time::neg_infin;
}
// Helper function for obtaining a time value that never fires.
static asio::deadline_timer::time_type pos_infin()
{
return boost::posix_time::pos_infin;
}
// Helper function to get a timer's expiry time.
static asio::deadline_timer::time_type expiry(
const asio::deadline_timer& timer)
{
return timer.expires_at();
}
#else // defined(ASIO_HAS_BOOST_DATE_TIME)
// Timer used for storing queued read operations.
asio::steady_timer pending_read_;
// Timer used for storing queued write operations.
asio::steady_timer pending_write_;
// Helper function for obtaining a time value that always fires.
static asio::steady_timer::time_point neg_infin()
{
return (asio::steady_timer::time_point::min)();
}
// Helper function for obtaining a time value that never fires.
static asio::steady_timer::time_point pos_infin()
{
return (asio::steady_timer::time_point::max)();
}
// Helper function to get a timer's expiry time.
static asio::steady_timer::time_point expiry(
const asio::steady_timer& timer)
{
return timer.expiry();
}
#endif // defined(ASIO_HAS_BOOST_DATE_TIME)
// Buffer space used to prepare output intended for the transport.
std::vector<unsigned char> output_buffer_space_;
// A buffer that may be used to prepare output intended for the transport.
const asio::mutable_buffer output_buffer_;
// Buffer space used to read input intended for the engine.
std::vector<unsigned char> input_buffer_space_;
// A buffer that may be used to read input intended for the engine.
const asio::mutable_buffer input_buffer_;
// The buffer pointing to the engine's unconsumed input.
asio::const_buffer input_;
};
} // namespace detail
} // namespace ssl
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_SSL_DETAIL_STREAM_CORE_HPP
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