189 lines
6.4 KiB
C++
189 lines
6.4 KiB
C++
/*
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Copyright (c) 2009-2016, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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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
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_UTP_SOCKET_MANAGER_HPP_INCLUDED
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#define TORRENT_UTP_SOCKET_MANAGER_HPP_INCLUDED
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#include <map>
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#include <functional>
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#include "libtorrent/socket_type.hpp"
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#include "libtorrent/session_status.hpp"
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#include "libtorrent/enum_net.hpp"
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#include "libtorrent/aux_/session_settings.hpp"
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#include "libtorrent/span.hpp"
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namespace libtorrent
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{
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class utp_stream;
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struct utp_socket_impl;
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struct counters;
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struct utp_socket_manager final
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{
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typedef std::function<void(udp::endpoint const&
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, span<char const>
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, error_code&, int)> send_fun_t;
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typedef std::function<void(std::shared_ptr<socket_type> const&)>
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incoming_utp_callback_t;
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utp_socket_manager(send_fun_t const& send_fun
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, incoming_utp_callback_t const& cb
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, io_service& ios
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, aux::session_settings const& sett
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, counters& cnt, void* ssl_context
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);
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~utp_socket_manager();
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// return false if this is not a uTP packet
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bool incoming_packet(udp::endpoint const& ep, span<char const> p);
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// if the UDP socket failed with an EAGAIN or EWOULDBLOCK, this will be
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// called once the socket is writeable again
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void writable();
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// when the upper layer has drained the underlying UDP socket, this is
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// called, and uTP sockets will send their ACKs. This ensures ACKs at
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// least coalese packets returned during the same wakeup
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void socket_drained();
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void tick(time_point now);
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// flags for send_packet
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enum { dont_fragment = 1 };
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void send_packet(udp::endpoint const& ep, char const* p, int len
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, error_code& ec, int flags = 0);
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void subscribe_writable(utp_socket_impl* s);
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// internal, used by utp_stream
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void remove_socket(std::uint16_t id);
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utp_socket_impl* new_utp_socket(utp_stream* str);
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int gain_factor() const { return m_sett.get_int(settings_pack::utp_gain_factor); }
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int target_delay() const { return m_sett.get_int(settings_pack::utp_target_delay) * 1000; }
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int syn_resends() const { return m_sett.get_int(settings_pack::utp_syn_resends); }
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int fin_resends() const { return m_sett.get_int(settings_pack::utp_fin_resends); }
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int num_resends() const { return m_sett.get_int(settings_pack::utp_num_resends); }
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int connect_timeout() const { return m_sett.get_int(settings_pack::utp_connect_timeout); }
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int min_timeout() const { return m_sett.get_int(settings_pack::utp_min_timeout); }
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int loss_multiplier() const { return m_sett.get_int(settings_pack::utp_loss_multiplier); }
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void mtu_for_dest(address const& addr, int& link_mtu, int& utp_mtu);
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int num_sockets() const { return int(m_utp_sockets.size()); }
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void defer_ack(utp_socket_impl* s);
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void subscribe_drained(utp_socket_impl* s);
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void restrict_mtu(int mtu)
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{
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m_restrict_mtu[m_mtu_idx] = mtu;
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m_mtu_idx = (m_mtu_idx + 1) % m_restrict_mtu.size();
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}
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int restrict_mtu() const
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{
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return *std::max_element(m_restrict_mtu.begin(), m_restrict_mtu.end());
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}
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// used to keep stats of uTP events
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// the counter is the enum from ``counters``.
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void inc_stats_counter(int counter, int delta = 1);
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private:
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// explicitly disallow assignment, to silence msvc warning
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utp_socket_manager& operator=(utp_socket_manager const&);
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send_fun_t m_send_fun;
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incoming_utp_callback_t m_cb;
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// replace with a hash-map
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typedef std::multimap<std::uint16_t, utp_socket_impl*> socket_map_t;
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socket_map_t m_utp_sockets;
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// this is a list of sockets that needs to send an ack.
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// once the UDP socket is drained, all of these will
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// have a chance to do that. This is to avoid sending
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// an ack for every single packet
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std::vector<utp_socket_impl*> m_deferred_acks;
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// sockets that have received or sent packets this
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// round, may subscribe to the event of draining the
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// UDP socket. At that point they may call the
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// user callback function to indicate bytes have been
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// sent or received.
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std::vector<utp_socket_impl*> m_drained_event;
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// list of sockets that received EWOULDBLOCK from the
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// underlying socket. They are notified when the socket
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// becomes writable again
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std::vector<utp_socket_impl*> m_stalled_sockets;
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// the last socket we received a packet on
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utp_socket_impl* m_last_socket = nullptr;
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int m_new_connection = -1;
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aux::session_settings const& m_sett;
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// this is a copy of the routing table, used
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// to initialize MTU sizes of uTP sockets
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mutable std::vector<ip_route> m_routes;
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// the timestamp for the last time we updated
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// the routing table
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mutable time_point m_last_route_update = min_time();
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// cache of interfaces
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mutable std::vector<ip_interface> m_interfaces;
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mutable time_point m_last_if_update = min_time();
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// the buffer size of the socket. This is used
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// to now lower the buffer size
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int m_sock_buf_size = 0;
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// stats counters
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counters& m_counters;
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io_service& m_ios;
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std::array<int, 3> m_restrict_mtu;
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int m_mtu_idx = 0;
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// this is passed on to the instantiate connection
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// if this is non-nullptr it will create SSL connections over uTP
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void* m_ssl_context;
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};
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}
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#endif
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