premiere-libtorrent/include/libtorrent/natpmp.hpp

162 lines
4.5 KiB
C++

/*
Copyright (c) 2007-2016, 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_NATPMP_HPP
#define TORRENT_NATPMP_HPP
#include "libtorrent/io_service_fwd.hpp"
#include "libtorrent/socket.hpp"
#include "libtorrent/address.hpp"
#include "libtorrent/error_code.hpp"
#include "libtorrent/deadline_timer.hpp"
#include "libtorrent/time.hpp"
#include "libtorrent/debug.hpp"
#include "libtorrent/aux_/portmap.hpp"
namespace libtorrent
{
struct TORRENT_EXTRA_EXPORT natpmp
: std::enable_shared_from_this<natpmp>
, single_threaded
{
natpmp(io_service& ios, aux::portmap_callback& cb);
void start();
// maps the ports, if a port is set to 0
// it will not be mapped
int add_mapping(aux::portmap_protocol p, int external_port, int local_port);
void delete_mapping(int mapping_index);
bool get_mapping(int mapping_index, int& local_port, int& external_port
, aux::portmap_protocol& protocol) const;
void close();
private:
std::shared_ptr<natpmp> self() { return shared_from_this(); }
void update_mapping(int i);
void send_map_request(int i);
void send_get_ip_address_request();
void resend_request(int i, error_code const& e);
void on_reply(error_code const& e
, std::size_t bytes_transferred);
void try_next_mapping(int i);
void update_expiration_timer();
void mapping_expired(error_code const& e, int i);
void close_impl();
#ifndef TORRENT_DISABLE_LOGGING
bool should_log() const;
void log(char const* fmt, ...) const TORRENT_FORMAT(2, 3);
#endif
void disable(error_code const& ec);
struct mapping_t
{
enum class action : std::uint8_t { none, add, del };
// indicates that the mapping has changed
// and needs an update
action act = action::none;
// the time the port mapping will expire
time_point expires;
// the local port for this mapping. If this is set
// to 0, the mapping is not in use
int local_port = 0;
// the external (on the NAT router) port
// for the mapping. This is the port we
// should announce to others
int external_port = 0;
aux::portmap_protocol protocol = aux::portmap_protocol::none;
// set to true when the first map request is sent
bool map_sent = false;
// set to true while we're waiting for a response
bool outstanding_request = false;
};
aux::portmap_callback& m_callback;
std::vector<mapping_t> m_mappings;
// the endpoint to the nat router
udp::endpoint m_nat_endpoint;
// this is the mapping that is currently
// being updated. It is -1 in case no
// mapping is being updated at the moment
int m_currently_mapping = -1;
// current retry count
int m_retry_count = 0;
// used to receive responses in
char m_response_buffer[16];
// router external IP address
address m_external_ip;
// the endpoint we received the message from
udp::endpoint m_remote;
// the udp socket used to communicate
// with the NAT router
udp::socket m_socket;
// used to resend udp packets in case
// they time out
deadline_timer m_send_timer;
// timer used to refresh mappings
deadline_timer m_refresh_timer;
// the mapping index that will expire next
int m_next_refresh = -1;
bool m_disabled = false;
bool m_abort = false;
};
}
#endif