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197 lines
8.2 KiB
C++
197 lines
8.2 KiB
C++
/// @file
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/// @author rfree (current maintainer in monero.cc project)
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/// @brief base for connection, contains e.g. the ratelimit hooks
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// ! This file might contain variable names same as in template class connection<>
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// ! from files contrib/epee/include/net/abstract_tcp_server2.*
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// ! I am not a lawyer; afaik APIs, var names etc are not copyrightable ;)
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// ! (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)
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// ! Working on above premise, IF this is valid in your juristdictions, then consider this code as released as:
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// Copyright (c) 2014-2022, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/* rfree: place for hanlers for the non-template base, can be used by connection<> template class in abstract_tcp_server2 file */
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#ifndef INCLUDED_p2p_connection_basic_hpp
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#define INCLUDED_p2p_connection_basic_hpp
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#include <string>
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#include <atomic>
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#include <memory>
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#include <boost/asio.hpp>
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#include <boost/asio/ssl.hpp>
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#include "byte_slice.h"
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#include "net/net_utils_base.h"
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#include "net/net_ssl.h"
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#include "syncobj.h"
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namespace epee
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{
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namespace net_utils
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{
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class connection_basic_shared_state
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{
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ssl_options_t ssl_options_;
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public:
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boost::asio::ssl::context ssl_context;
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std::atomic<long> sock_count;
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std::atomic<long> sock_number;
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connection_basic_shared_state()
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: ssl_options_(ssl_support_t::e_ssl_support_disabled),
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ssl_context(boost::asio::ssl::context::tlsv12),
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sock_count(0),
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sock_number(0)
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{}
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void configure_ssl(ssl_options_t src)
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{
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ssl_options_ = std::move(src);
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ssl_context = ssl_options_.create_context();
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}
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const ssl_options_t& ssl_options() const noexcept { return ssl_options_; }
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};
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/************************************************************************/
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/* */
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/************************************************************************/
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/// Represents a single connection from a client.
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class connection_basic_pimpl; // PIMPL for this class
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enum t_connection_type { // type of the connection (of this server), e.g. so that we will know how to limit it
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e_connection_type_NET = 0, // default (not used?)
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e_connection_type_RPC = 1, // the rpc commands (probably not rate limited, not chunked, etc)
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e_connection_type_P2P = 2 // to other p2p node (probably limited)
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};
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std::string to_string(t_connection_type type);
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class connection_basic { // not-templated base class for rapid developmet of some code parts
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// beware of removing const, net_utils::connection is sketchily doing a cast to prevent storing ptr twice
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const std::shared_ptr<connection_basic_shared_state> m_state;
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public:
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std::unique_ptr< connection_basic_pimpl > mI; // my Implementation
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// moved here from orginal connecton<> - common member variables that do not depend on template in connection<>
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std::atomic<bool> m_want_close_connection;
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std::atomic<bool> m_was_shutdown;
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critical_section m_send_que_lock;
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std::deque<byte_slice> m_send_que;
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volatile bool m_is_multithreaded;
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/// Strand to ensure the connection's handlers are not called concurrently.
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boost::asio::io_service::strand strand_;
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/// Socket for the connection.
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boost::asio::ssl::stream<boost::asio::ip::tcp::socket> socket_;
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ssl_support_t m_ssl_support;
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public:
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// first counter is the ++/-- count of current sockets, the other socket_number is only-increasing ++ number generator
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connection_basic(boost::asio::ip::tcp::socket&& socket, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support);
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connection_basic(boost::asio::io_service &io_service, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support);
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virtual ~connection_basic() noexcept(false);
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//! \return `shared_state` object passed in construction (ptr never changes).
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connection_basic_shared_state& get_state() noexcept { return *m_state; /* verified in constructor */ }
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connection_basic(boost::asio::io_service& io_service, std::atomic<long> &ref_sock_count, std::atomic<long> &sock_number, ssl_support_t ssl);
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boost::asio::ip::tcp::socket& socket() { return socket_.next_layer(); }
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ssl_support_t get_ssl_support() const { return m_ssl_support; }
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void disable_ssl() { m_ssl_support = epee::net_utils::ssl_support_t::e_ssl_support_disabled; }
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bool handshake(boost::asio::ssl::stream_base::handshake_type type, boost::asio::const_buffer buffer = {})
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{
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//m_state != nullptr verified in constructor
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return m_state->ssl_options().handshake(socket_, type, buffer);
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}
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template<typename MutableBufferSequence, typename ReadHandler>
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void async_read_some(const MutableBufferSequence &buffers, ReadHandler &&handler)
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{
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if (m_ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_enabled)
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socket_.async_read_some(buffers, std::forward<ReadHandler>(handler));
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else
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socket().async_read_some(buffers, std::forward<ReadHandler>(handler));
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}
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template<typename ConstBufferSequence, typename WriteHandler>
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void async_write_some(const ConstBufferSequence &buffers, WriteHandler &&handler)
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{
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if (m_ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_enabled)
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socket_.async_write_some(buffers, std::forward<WriteHandler>(handler));
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else
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socket().async_write_some(buffers, std::forward<WriteHandler>(handler));
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}
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template<typename ConstBufferSequence, typename WriteHandler>
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void async_write(const ConstBufferSequence &buffers, WriteHandler &&handler)
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{
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if (m_ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_enabled)
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boost::asio::async_write(socket_, buffers, std::forward<WriteHandler>(handler));
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else
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boost::asio::async_write(socket(), buffers, std::forward<WriteHandler>(handler));
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}
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// various handlers to be called from connection class:
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void do_send_handler_write(const void * ptr , size_t cb);
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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
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void logger_handle_net_write(size_t size); // network data written
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void logger_handle_net_read(size_t size); // network data read
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// config for rate limit
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static void set_rate_up_limit(uint64_t limit);
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static void set_rate_down_limit(uint64_t limit);
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static uint64_t get_rate_up_limit();
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static uint64_t get_rate_down_limit();
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// config misc
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static void set_tos_flag(int tos); // ToS / QoS flag
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static int get_tos_flag();
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// handlers and sleep
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void sleep_before_packet(size_t packet_size, int phase, int q_len); // execute a sleep ; phase is not really used now(?)
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static void save_limit_to_file(int limit); ///< for dr-monero
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static double get_sleep_time(size_t cb);
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};
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} // nameserver
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} // nameserver
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#endif
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