169 lines
4.7 KiB
C++
169 lines
4.7 KiB
C++
/*
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Copyright (c) 2007, 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_NATPMP_HPP
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#define TORRENT_NATPMP_HPP
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#include "libtorrent/socket.hpp"
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#include "libtorrent/error_code.hpp"
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#include "libtorrent/intrusive_ptr_base.hpp"
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#include "libtorrent/deadline_timer.hpp"
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#include <boost/function.hpp>
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#include <boost/thread/mutex.hpp>
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namespace libtorrent
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{
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// int: port mapping index
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// int: external port
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// std::string: error message
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typedef boost::function<void(int, int, error_code const&)> portmap_callback_t;
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typedef boost::function<void(char const*)> log_callback_t;
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class TORRENT_EXPORT natpmp : public intrusive_ptr_base<natpmp>
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{
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public:
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natpmp(io_service& ios, address const& listen_interface
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, portmap_callback_t const& cb
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, log_callback_t const& lcb);
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void rebind(address const& listen_interface);
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// maps the ports, if a port is set to 0
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// it will not be mapped
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enum protocol_type { none = 0, udp = 1, tcp = 2 };
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int add_mapping(protocol_type p, int external_port, int local_port);
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void delete_mapping(int mapping_index);
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bool get_mapping(int mapping_index, int& local_port, int& external_port, int& protocol) const;
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void close();
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private:
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typedef boost::mutex mutex_t;
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void update_mapping(int i, mutex_t::scoped_lock& l);
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void send_map_request(int i, mutex_t::scoped_lock& l);
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void resend_request(int i, error_code const& e);
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void on_reply(error_code const& e
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, std::size_t bytes_transferred);
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void try_next_mapping(int i, mutex_t::scoped_lock& l);
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void update_expiration_timer();
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void mapping_expired(error_code const& e, int i);
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void close_impl(mutex_t::scoped_lock& l);
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void log(char const* msg, mutex_t::scoped_lock& l);
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void disable(error_code const& ec, mutex_t::scoped_lock& l);
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struct mapping_t
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{
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enum action_t { action_none, action_add, action_delete };
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mapping_t()
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: action(action_none)
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, local_port(0)
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, external_port(0)
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, protocol(none)
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, map_sent(false)
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{}
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// indicates that the mapping has changed
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// and needs an update
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int action;
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// the time the port mapping will expire
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ptime expires;
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// the local port for this mapping. If this is set
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// to 0, the mapping is not in use
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int local_port;
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// the external (on the NAT router) port
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// for the mapping. This is the port we
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// should announce to others
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int external_port;
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int protocol;
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// set to true when the first map request is sent
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bool map_sent;
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};
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portmap_callback_t m_callback;
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log_callback_t m_log_callback;
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std::vector<mapping_t> m_mappings;
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// the endpoint to the nat router
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udp::endpoint m_nat_endpoint;
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// this is the mapping that is currently
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// being updated. It is -1 in case no
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// mapping is being updated at the moment
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int m_currently_mapping;
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// current retry count
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int m_retry_count;
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// used to receive responses in
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char m_response_buffer[16];
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// the endpoint we received the message from
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udp::endpoint m_remote;
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// the udp socket used to communicate
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// with the NAT router
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datagram_socket m_socket;
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// used to resend udp packets in case
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// they time out
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deadline_timer m_send_timer;
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// timer used to refresh mappings
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deadline_timer m_refresh_timer;
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// the mapping index that will expire next
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int m_next_refresh;
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bool m_disabled;
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bool m_abort;
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mutable mutex_t m_mutex;
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};
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}
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#endif
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