/// @file
/// @author rfree (current maintainer in monero.cc project)
/// @brief base for connection, contains e.g. the ratelimit hooks
// ! This file might contain variable names same as in template class connection<>
// ! from files contrib/epee/include/net/abstract_tcp_server2.*
// ! I am not a lawyer; afaik APIs, var names etc are not copyrightable ;)
// ! (how ever if in some wonderful juristdictions that is not the case, then why not make another sub-class withat that members and licence it as epee part)
// ! Working on above premise, IF this is valid in your juristdictions, then consider this code as released as:
// Copyright (c) 2014-2019, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/* rfree: place for hanlers for the non-template base, can be used by connection<> template class in abstract_tcp_server2 file */
#ifndef INCLUDED_p2p_connection_basic_hpp
#define INCLUDED_p2p_connection_basic_hpp
#include <string>
#include <atomic>
#include <memory>
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
#include "byte_slice.h"
#include "net/net_utils_base.h"
#include "net/net_ssl.h"
#include "syncobj.h"
namespace epee
{
namespace net_utils
{
class connection_basic_shared_state
{
ssl_options_t ssl_options_;
public:
boost::asio::ssl::context ssl_context;
std::atomic<long> sock_count;
std::atomic<long> sock_number;
connection_basic_shared_state()
: ssl_options_(ssl_support_t::e_ssl_support_disabled),
ssl_context(boost::asio::ssl::context::tlsv12),
sock_count(0),
sock_number(0)
{}
void configure_ssl(ssl_options_t src)
{
ssl_options_ = std::move(src);
ssl_context = ssl_options_.create_context();
}
const ssl_options_t& ssl_options() const noexcept { return ssl_options_; }
};
/************************************************************************/
/* */
/************************************************************************/
/// Represents a single connection from a client.
class connection_basic_pimpl; // PIMPL for this class
enum t_connection_type { // type of the connection (of this server), e.g. so that we will know how to limit it
e_connection_type_NET = 0, // default (not used?)
e_connection_type_RPC = 1, // the rpc commands (probably not rate limited, not chunked, etc)
e_connection_type_P2P = 2 // to other p2p node (probably limited)
};
std::string to_string(t_connection_type type);
class connection_basic { // not-templated base class for rapid developmet of some code parts
// beware of removing const, net_utils::connection is sketchily doing a cast to prevent storing ptr twice
const std::shared_ptr<connection_basic_shared_state> m_state;
public:
std::unique_ptr< connection_basic_pimpl > mI; // my Implementation
// moved here from orginal connecton<> - common member variables that do not depend on template in connection<>
volatile uint32_t m_want_close_connection;
std::atomic<bool> m_was_shutdown;
critical_section m_send_que_lock;
std::deque<byte_slice> m_send_que;
volatile bool m_is_multithreaded;
/// Strand to ensure the connection's handlers are not called concurrently.
boost::asio::io_service::strand strand_;
/// Socket for the connection.
boost::asio::ssl::stream<boost::asio::ip::tcp::socket> socket_;
ssl_support_t m_ssl_support;
public:
// first counter is the ++/-- count of current sockets, the other socket_number is only-increasing ++ number generator
connection_basic(boost::asio::ip::tcp::socket&& socket, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support);
connection_basic(boost::asio::io_service &io_service, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support);
virtual ~connection_basic() noexcept(false);
//! \return `shared_state` object passed in construction (ptr never changes).
connection_basic_shared_state& get_state() noexcept { return *m_state; /* verified in constructor */ }
connection_basic(boost::asio::io_service& io_service, std::atomic<long> &ref_sock_count, std::atomic<long> &sock_number, ssl_support_t ssl);
boost::asio::ip::tcp::socket& socket() { return socket_.next_layer(); }
ssl_support_t get_ssl_support() const { return m_ssl_support; }
void disable_ssl() { m_ssl_support = epee::net_utils::ssl_support_t::e_ssl_support_disabled; }
bool handshake(boost::asio::ssl::stream_base::handshake_type type)
{
//m_state != nullptr verified in constructor
return m_state->ssl_options().handshake(socket_, type);
}
template<typename MutableBufferSequence, typename ReadHandler>
void async_read_some(const MutableBufferSequence &buffers, ReadHandler &&handler)
{
if (m_ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_enabled)
socket_.async_read_some(buffers, std::forward<ReadHandler>(handler));
else
socket().async_read_some(buffers, std::forward<ReadHandler>(handler));
}
template<typename ConstBufferSequence, typename WriteHandler>
void async_write_some(const ConstBufferSequence &buffers, WriteHandler &&handler)
{
if (m_ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_enabled)
socket_.async_write_some(buffers, std::forward<WriteHandler>(handler));
else
socket().async_write_some(buffers, std::forward<WriteHandler>(handler));
}
template<typename ConstBufferSequence, typename WriteHandler>
void async_write(const ConstBufferSequence &buffers, WriteHandler &&handler)
{
if (m_ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_enabled)
boost::asio::async_write(socket_, buffers, std::forward<WriteHandler>(handler));
else
boost::asio::async_write(socket(), buffers, std::forward<WriteHandler>(handler));
}
// various handlers to be called from connection class:
void do_send_handler_write(const void * ptr , size_t cb);
void do_send_handler_write_from_queue(const boost::system::error_code& e, size_t cb , int q_len); // from handle_write, sending next part
void logger_handle_net_write(size_t size); // network data written
void logger_handle_net_read(size_t size); // network data read
// config for rate limit
static void set_rate_up_limit(uint64_t limit);
static void set_rate_down_limit(uint64_t limit);
static uint64_t get_rate_up_limit();
static uint64_t get_rate_down_limit();
// config misc
static void set_tos_flag(int tos); // ToS / QoS flag
static int get_tos_flag();
// handlers and sleep
void sleep_before_packet(size_t packet_size, int phase, int q_len); // execute a sleep ; phase is not really used now(?)
static void save_limit_to_file(int limit); ///< for dr-monero
static double get_sleep_time(size_t cb);
};
} // nameserver
} // nameserver
#endif
