163 lines
5.8 KiB
C++
163 lines
5.8 KiB
C++
/*
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Copyright (c) 2009-2014, 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 "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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namespace libtorrent
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{
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class udp_socket;
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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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typedef boost::function<void(boost::shared_ptr<socket_type> const&)> incoming_utp_callback_t;
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struct utp_socket_manager : udp_socket_observer
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{
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utp_socket_manager(aux::session_settings const& sett, udp_socket& s
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, counters& cnt, void* ssl_context, incoming_utp_callback_t cb);
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~utp_socket_manager();
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// return false if this is not a uTP packet
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virtual bool incoming_packet(error_code const& ec, udp::endpoint const& ep
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, char const* p, int size);
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virtual bool incoming_packet(error_code const&, char const*, char const*, int)
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{ return false; }
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virtual void writable();
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virtual void socket_drained();
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void tick(ptime now);
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tcp::endpoint local_endpoint(address const& remote, error_code& ec) const;
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int local_port(error_code& ec) const;
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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(boost::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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bool allow_dynamic_sock_buf() const { return m_sett.get_bool(settings_pack::utp_dynamic_sock_buf); }
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void mtu_for_dest(address const& addr, int& link_mtu, int& utp_mtu);
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void set_sock_buf(int size);
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int num_sockets() const { return 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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// 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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udp_socket& m_sock;
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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<boost::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;
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int m_new_connection;
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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 ptime m_last_route_update;
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// cache of interfaces
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mutable std::vector<ip_interface> m_interfaces;
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mutable ptime m_last_if_update;
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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;
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// stats counters
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counters& m_counters;
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// this is passed on to the instantiate connection
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// if this is non-null 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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