190 lines
6.4 KiB
C++
190 lines
6.4 KiB
C++
/*
|
|
|
|
Copyright (c) 2009-2016, Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* 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.
|
|
* Neither the name of the author 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 OWNER 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.
|
|
|
|
*/
|
|
|
|
#ifndef TORRENT_UTP_SOCKET_MANAGER_HPP_INCLUDED
|
|
#define TORRENT_UTP_SOCKET_MANAGER_HPP_INCLUDED
|
|
|
|
#include <map>
|
|
#include <functional>
|
|
|
|
#include "libtorrent/socket_type.hpp"
|
|
#include "libtorrent/session_status.hpp"
|
|
#include "libtorrent/enum_net.hpp"
|
|
#include "libtorrent/aux_/session_settings.hpp"
|
|
#include "libtorrent/span.hpp"
|
|
|
|
namespace libtorrent
|
|
{
|
|
class utp_stream;
|
|
struct utp_socket_impl;
|
|
struct counters;
|
|
|
|
struct utp_socket_manager final
|
|
{
|
|
typedef std::function<void(udp::endpoint const&
|
|
, span<char const>
|
|
, error_code&, int)> send_fun_t;
|
|
|
|
typedef std::function<void(boost::shared_ptr<socket_type> const&)>
|
|
incoming_utp_callback_t;
|
|
|
|
utp_socket_manager(send_fun_t const& send_fun
|
|
, incoming_utp_callback_t const& cb
|
|
, io_service& ios
|
|
, aux::session_settings const& sett
|
|
, counters& cnt, void* ssl_context
|
|
);
|
|
~utp_socket_manager();
|
|
|
|
// return false if this is not a uTP packet
|
|
bool incoming_packet(udp::endpoint const& ep, span<char const> p);
|
|
|
|
// if the UDP socket failed with an EAGAIN or EWOULDBLOCK, this will be
|
|
// called once the socket is writeable again
|
|
void writable();
|
|
|
|
// when the upper layer has drained the underlying UDP socket, this is
|
|
// called, and uTP sockets will send their ACKs. This ensures ACKs at
|
|
// least coalese packets returned during the same wakeup
|
|
void socket_drained();
|
|
|
|
void tick(time_point now);
|
|
|
|
// flags for send_packet
|
|
enum { dont_fragment = 1 };
|
|
void send_packet(udp::endpoint const& ep, char const* p, int len
|
|
, error_code& ec, int flags = 0);
|
|
void subscribe_writable(utp_socket_impl* s);
|
|
|
|
// internal, used by utp_stream
|
|
void remove_socket(std::uint16_t id);
|
|
|
|
utp_socket_impl* new_utp_socket(utp_stream* str);
|
|
int gain_factor() const { return m_sett.get_int(settings_pack::utp_gain_factor); }
|
|
int target_delay() const { return m_sett.get_int(settings_pack::utp_target_delay) * 1000; }
|
|
int syn_resends() const { return m_sett.get_int(settings_pack::utp_syn_resends); }
|
|
int fin_resends() const { return m_sett.get_int(settings_pack::utp_fin_resends); }
|
|
int num_resends() const { return m_sett.get_int(settings_pack::utp_num_resends); }
|
|
int connect_timeout() const { return m_sett.get_int(settings_pack::utp_connect_timeout); }
|
|
int min_timeout() const { return m_sett.get_int(settings_pack::utp_min_timeout); }
|
|
int loss_multiplier() const { return m_sett.get_int(settings_pack::utp_loss_multiplier); }
|
|
|
|
void mtu_for_dest(address const& addr, int& link_mtu, int& utp_mtu);
|
|
int num_sockets() const { return int(m_utp_sockets.size()); }
|
|
|
|
void defer_ack(utp_socket_impl* s);
|
|
void subscribe_drained(utp_socket_impl* s);
|
|
|
|
void restrict_mtu(int mtu)
|
|
{
|
|
m_restrict_mtu[m_mtu_idx] = mtu;
|
|
m_mtu_idx = (m_mtu_idx + 1) % m_restrict_mtu.size();
|
|
}
|
|
|
|
int restrict_mtu() const
|
|
{
|
|
return *std::max_element(m_restrict_mtu.begin(), m_restrict_mtu.end());
|
|
}
|
|
|
|
// used to keep stats of uTP events
|
|
// the counter is the enum from ``counters``.
|
|
void inc_stats_counter(int counter, int delta = 1);
|
|
|
|
private:
|
|
// explicitly disallow assignment, to silence msvc warning
|
|
utp_socket_manager& operator=(utp_socket_manager const&);
|
|
|
|
send_fun_t m_send_fun;
|
|
incoming_utp_callback_t m_cb;
|
|
|
|
// replace with a hash-map
|
|
typedef std::multimap<std::uint16_t, utp_socket_impl*> socket_map_t;
|
|
socket_map_t m_utp_sockets;
|
|
|
|
// this is a list of sockets that needs to send an ack.
|
|
// once the UDP socket is drained, all of these will
|
|
// have a chance to do that. This is to avoid sending
|
|
// an ack for every single packet
|
|
std::vector<utp_socket_impl*> m_deferred_acks;
|
|
|
|
// sockets that have received or sent packets this
|
|
// round, may subscribe to the event of draining the
|
|
// UDP socket. At that point they may call the
|
|
// user callback function to indicate bytes have been
|
|
// sent or received.
|
|
std::vector<utp_socket_impl*> m_drained_event;
|
|
|
|
// list of sockets that received EWOULDBLOCK from the
|
|
// underlying socket. They are notified when the socket
|
|
// becomes writable again
|
|
std::vector<utp_socket_impl*> m_stalled_sockets;
|
|
|
|
// the last socket we received a packet on
|
|
utp_socket_impl* m_last_socket;
|
|
|
|
int m_new_connection;
|
|
|
|
aux::session_settings const& m_sett;
|
|
|
|
// this is a copy of the routing table, used
|
|
// to initialize MTU sizes of uTP sockets
|
|
mutable std::vector<ip_route> m_routes;
|
|
|
|
// the timestamp for the last time we updated
|
|
// the routing table
|
|
mutable time_point m_last_route_update;
|
|
|
|
// cache of interfaces
|
|
mutable std::vector<ip_interface> m_interfaces;
|
|
mutable time_point m_last_if_update;
|
|
|
|
// the buffer size of the socket. This is used
|
|
// to now lower the buffer size
|
|
int m_sock_buf_size;
|
|
|
|
// stats counters
|
|
counters& m_counters;
|
|
|
|
io_service& m_ios;
|
|
|
|
std::array<int, 3> m_restrict_mtu;
|
|
int m_mtu_idx;
|
|
|
|
// this is passed on to the instantiate connection
|
|
// if this is non-nullptr it will create SSL connections over uTP
|
|
void* m_ssl_context;
|
|
};
|
|
}
|
|
|
|
#endif
|
|
|