692 lines
21 KiB
C++
692 lines
21 KiB
C++
/*
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Copyright (c) 2006, 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_SESSION_IMPL_HPP_INCLUDED
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#define TORRENT_SESSION_IMPL_HPP_INCLUDED
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#include <ctime>
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#include <algorithm>
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#include <vector>
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#include <set>
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#include <list>
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#include <deque>
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#ifdef _MSC_VER
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#pragma warning(push, 1)
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#endif
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#include <boost/limits.hpp>
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#include <boost/tuple/tuple.hpp>
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#include <boost/filesystem/path.hpp>
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#include <boost/thread.hpp>
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#include <boost/thread/recursive_mutex.hpp>
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#include "libtorrent/torrent_handle.hpp"
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#include "libtorrent/entry.hpp"
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#include "libtorrent/torrent_info.hpp"
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#include "libtorrent/socket.hpp"
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#include "libtorrent/peer_connection.hpp"
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#include "libtorrent/peer_id.hpp"
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#include "libtorrent/policy.hpp"
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#include "libtorrent/tracker_manager.hpp"
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#include "libtorrent/peer_info.hpp"
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#include "libtorrent/alert.hpp"
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#include "libtorrent/fingerprint.hpp"
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#include "libtorrent/debug.hpp"
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#include "libtorrent/peer_request.hpp"
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#include "libtorrent/piece_block_progress.hpp"
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#include "libtorrent/ip_filter.hpp"
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#include "libtorrent/config.hpp"
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#include "libtorrent/session_settings.hpp"
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#include "libtorrent/kademlia/dht_tracker.hpp"
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#include "libtorrent/session_status.hpp"
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#include "libtorrent/session.hpp"
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#include "libtorrent/stat.hpp"
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#include "libtorrent/file_pool.hpp"
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#include "libtorrent/bandwidth_manager.hpp"
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#include "libtorrent/natpmp.hpp"
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#include "libtorrent/upnp.hpp"
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#include "libtorrent/lsd.hpp"
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#include "libtorrent/socket_type.hpp"
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#include "libtorrent/connection_queue.hpp"
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#include "libtorrent/disk_io_thread.hpp"
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#include "libtorrent/assert.hpp"
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namespace libtorrent
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{
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namespace fs = boost::filesystem;
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namespace aux
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{
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struct session_impl;
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// this data is shared between the main thread and the
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// thread that initialize pieces
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struct piece_checker_data
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{
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piece_checker_data()
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: processing(false), progress(0.f), abort(false) {}
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boost::shared_ptr<torrent> torrent_ptr;
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fs::path save_path;
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sha1_hash info_hash;
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void parse_resume_data(
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const entry& rd
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, const torrent_info& info
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, std::string& error);
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std::vector<int> piece_map;
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std::vector<piece_picker::downloading_piece> unfinished_pieces;
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std::vector<piece_picker::block_info> block_info;
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std::vector<tcp::endpoint> peers;
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std::vector<tcp::endpoint> banned_peers;
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entry resume_data;
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// this is true if this torrent is being processed (checked)
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// if it is not being processed, then it can be removed from
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// the queue without problems, otherwise the abort flag has
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// to be set.
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bool processing;
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// is filled in by storage::initialize_pieces()
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// and represents the progress. It should be a
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// value in the range [0, 1]
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float progress;
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// abort defaults to false and is typically
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// filled in by torrent_handle when the user
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// aborts the torrent
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bool abort;
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};
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struct checker_impl: boost::noncopyable
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{
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checker_impl(session_impl& s): m_ses(s), m_abort(false) {}
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void operator()();
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piece_checker_data* find_torrent(const sha1_hash& info_hash);
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void remove_torrent(sha1_hash const& info_hash, int options);
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#ifndef NDEBUG
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void check_invariant() const;
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#endif
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// when the files has been checked
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// the torrent is added to the session
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session_impl& m_ses;
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mutable boost::mutex m_mutex;
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boost::condition m_cond;
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// a list of all torrents that are currently in queue
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// or checking their files
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std::deque<boost::shared_ptr<piece_checker_data> > m_torrents;
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std::deque<boost::shared_ptr<piece_checker_data> > m_processing;
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bool m_abort;
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};
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#if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING)
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struct tracker_logger;
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#endif
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// this is the link between the main thread and the
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// thread started to run the main downloader loop
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struct session_impl: boost::noncopyable
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{
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// the size of each allocation that is chained in the send buffer
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enum { send_buffer_size = 200 };
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#ifndef NDEBUG
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friend class ::libtorrent::peer_connection;
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#endif
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friend struct checker_impl;
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friend class invariant_access;
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typedef std::set<boost::intrusive_ptr<peer_connection> > connection_map;
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typedef std::map<sha1_hash, boost::shared_ptr<torrent> > torrent_map;
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session_impl(
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std::pair<int, int> listen_port_range
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, fingerprint const& cl_fprint
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, char const* listen_interface
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#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
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, fs::path const& logpath
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#endif
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);
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~session_impl();
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#ifndef TORRENT_DISABLE_EXTENSIONS
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void add_extension(boost::function<boost::shared_ptr<torrent_plugin>(
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torrent*, void*)> ext);
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#endif
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#ifndef NDEBUG
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bool has_peer(peer_connection const* p) const
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{
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return std::find_if(m_connections.begin(), m_connections.end()
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, boost::bind(&boost::intrusive_ptr<peer_connection>::get, _1) == p)
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!= m_connections.end();
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}
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#endif
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void operator()();
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void open_listen_port();
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// if we are listening on an IPv6 interface
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// this will return one of the IPv6 addresses on this
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// machine, otherwise just an empty endpoint
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tcp::endpoint get_ipv6_interface() const;
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void async_accept(boost::shared_ptr<socket_acceptor> const& listener);
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void on_incoming_connection(boost::shared_ptr<socket_type> const& s
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, boost::weak_ptr<socket_acceptor> listener, asio::error_code const& e);
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// must be locked to access the data
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// in this struct
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typedef boost::recursive_mutex mutex_t;
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mutable mutex_t m_mutex;
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boost::weak_ptr<torrent> find_torrent(const sha1_hash& info_hash);
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peer_id const& get_peer_id() const { return m_peer_id; }
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void close_connection(peer_connection const* p
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, char const* message);
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void set_settings(session_settings const& s);
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session_settings const& settings() const { return m_settings; }
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#ifndef TORRENT_DISABLE_DHT
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void add_dht_node(std::pair<std::string, int> const& node);
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void add_dht_node(udp::endpoint n);
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void add_dht_router(std::pair<std::string, int> const& node);
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void set_dht_settings(dht_settings const& s);
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dht_settings const& get_dht_settings() const { return m_dht_settings; }
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void start_dht(entry const& startup_state);
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void stop_dht();
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entry dht_state() const;
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#endif
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#ifndef TORRENT_DISABLE_ENCRYPTION
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void set_pe_settings(pe_settings const& settings);
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pe_settings const& get_pe_settings() const { return m_pe_settings; }
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#endif
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// called when a port mapping is successful, or a router returns
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// a failure to map a port
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void on_port_mapping(int tcp_port, int udp_port, std::string const& errmsg);
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bool is_aborted() const { return m_abort; }
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void set_ip_filter(ip_filter const& f);
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void set_port_filter(port_filter const& f);
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bool listen_on(
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std::pair<int, int> const& port_range
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, const char* net_interface = 0);
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bool is_listening() const;
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torrent_handle add_torrent(
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boost::intrusive_ptr<torrent_info> ti
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, fs::path const& save_path
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, entry const& resume_data
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, storage_mode_t storage_mode
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, storage_constructor_type sc
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, bool paused
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, void* userdata);
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torrent_handle add_torrent(
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char const* tracker_url
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, sha1_hash const& info_hash
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, char const* name
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, fs::path const& save_path
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, entry const& resume_data
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, storage_mode_t storage_mode
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, storage_constructor_type sc
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, bool paused
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, void* userdata);
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void remove_torrent(torrent_handle const& h, int options);
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std::vector<torrent_handle> get_torrents();
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void set_severity_level(alert::severity_t s);
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std::auto_ptr<alert> pop_alert();
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alert const* wait_for_alert(time_duration max_wait);
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int upload_rate_limit() const;
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int download_rate_limit() const;
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void set_download_rate_limit(int bytes_per_second);
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void set_upload_rate_limit(int bytes_per_second);
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void set_max_half_open_connections(int limit);
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void set_max_connections(int limit);
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void set_max_uploads(int limit);
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int max_connections() const { return m_max_connections; }
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int max_uploads() const { return m_max_uploads; }
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int max_half_open_connections() const { return m_half_open.limit(); }
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int num_uploads() const { return m_num_unchoked; }
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int num_connections() const
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{ return m_connections.size(); }
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void unchoke_peer(peer_connection& c)
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{
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torrent* t = c.associated_torrent().lock().get();
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TORRENT_ASSERT(t);
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if (t->unchoke_peer(c))
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++m_num_unchoked;
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}
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session_status status() const;
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void set_peer_id(peer_id const& id);
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void set_key(int key);
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unsigned short listen_port() const;
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void abort();
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torrent_handle find_torrent_handle(sha1_hash const& info_hash);
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void announce_lsd(sha1_hash const& ih);
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void set_peer_proxy(proxy_settings const& s)
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{ m_peer_proxy = s; }
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void set_web_seed_proxy(proxy_settings const& s)
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{ m_web_seed_proxy = s; }
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void set_tracker_proxy(proxy_settings const& s)
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{ m_tracker_proxy = s; }
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proxy_settings const& peer_proxy() const
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{ return m_peer_proxy; }
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proxy_settings const& web_seed_proxy() const
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{ return m_web_seed_proxy; }
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proxy_settings const& tracker_proxy() const
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{ return m_tracker_proxy; }
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#ifndef TORRENT_DISABLE_DHT
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void set_dht_proxy(proxy_settings const& s)
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{
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m_dht_proxy = s;
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m_dht_socket.set_proxy_settings(s);
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}
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proxy_settings const& dht_proxy() const
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{ return m_dht_proxy; }
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#endif
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#ifdef TORRENT_STATS
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void log_buffer_usage()
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{
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int send_buffer_capacity = 0;
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int used_send_buffer = 0;
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for (connection_map::const_iterator i = m_connections.begin()
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, end(m_connections.end()); i != end; ++i)
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{
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send_buffer_capacity += (*i)->send_buffer_capacity();
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used_send_buffer += (*i)->send_buffer_size();
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}
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TORRENT_ASSERT(send_buffer_capacity >= used_send_buffer);
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m_buffer_usage_logger << log_time() << " send_buffer_size: " << send_buffer_capacity << std::endl;
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m_buffer_usage_logger << log_time() << " used_send_buffer: " << used_send_buffer << std::endl;
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m_buffer_usage_logger << log_time() << " send_buffer_utilization: "
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<< (used_send_buffer * 100.f / send_buffer_capacity) << std::endl;
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}
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#endif
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void start_lsd();
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void start_natpmp();
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void start_upnp();
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void stop_lsd();
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void stop_natpmp();
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void stop_upnp();
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// handles delayed alerts
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alert_manager m_alerts;
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std::pair<char*, int> allocate_buffer(int size);
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void free_buffer(char* buf, int size);
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void free_disk_buffer(char* buf);
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// private:
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void on_lsd_peer(tcp::endpoint peer, sha1_hash const& ih);
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// this pool is used to allocate and recycle send
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// buffers from.
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boost::pool<> m_send_buffers;
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boost::mutex m_send_buffer_mutex;
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// the file pool that all storages in this session's
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// torrents uses. It sets a limit on the number of
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// open files by this session.
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// file pool must be destructed after the torrents
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// since they will still have references to it
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// when they are destructed.
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file_pool m_files;
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// this is where all active sockets are stored.
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// the selector can sleep while there's no activity on
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// them
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io_service m_io_service;
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// handles disk io requests asynchronously
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// peers have pointers into the disk buffer
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// pool, and must be destructed before this
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// object. The disk thread relies on the file
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// pool object, and must be destructed before
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// m_files. The disk io thread posts completion
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// events to the io service, and needs to be
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// constructed after it.
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disk_io_thread m_disk_thread;
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// this is a list of half-open tcp connections
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// (only outgoing connections)
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// this has to be one of the last
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// members to be destructed
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connection_queue m_half_open;
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// the bandwidth manager is responsible for
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// handing out bandwidth to connections that
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// asks for it, it can also throttle the
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// rate.
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bandwidth_manager<peer_connection, torrent> m_download_channel;
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bandwidth_manager<peer_connection, torrent> m_upload_channel;
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bandwidth_manager<peer_connection, torrent>* m_bandwidth_manager[2];
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tracker_manager m_tracker_manager;
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torrent_map m_torrents;
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// this maps sockets to their peer_connection
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// object. It is the complete list of all connected
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// peers.
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connection_map m_connections;
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// filters incoming connections
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ip_filter m_ip_filter;
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// filters outgoing connections
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port_filter m_port_filter;
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// the peer id that is generated at the start of the session
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peer_id m_peer_id;
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// the key is an id that is used to identify the
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// client with the tracker only. It is randomized
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// at startup
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int m_key;
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// the number of retries we make when binding the
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// listen socket. For each retry the port number
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// is incremented by one
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int m_listen_port_retries;
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// the ip-address of the interface
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// we are supposed to listen on.
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// if the ip is set to zero, it means
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// that we should let the os decide which
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// interface to listen on
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tcp::endpoint m_listen_interface;
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// if we're listening on an IPv6 interface
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// this is one of the non local IPv6 interfaces
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// on this machine
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tcp::endpoint m_ipv6_interface;
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struct listen_socket_t
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{
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listen_socket_t(): external_port(0) {}
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// this is typically set to the same as the local
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// listen port. In case a NAT port forward was
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// successfully opened, this will be set to the
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// port that is open on the external (NAT) interface
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// on the NAT box itself. This is the port that has
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// to be published to peers, since this is the port
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// the client is reachable through.
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int external_port;
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// the actual socket
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boost::shared_ptr<socket_acceptor> sock;
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};
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// since we might be listening on multiple interfaces
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// we might need more than one listen socket
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std::list<listen_socket_t> m_listen_sockets;
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listen_socket_t setup_listener(tcp::endpoint ep, int retries, bool v6_only = false);
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// the settings for the client
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session_settings m_settings;
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// the proxy settings for different
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// kinds of connections
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proxy_settings m_peer_proxy;
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proxy_settings m_web_seed_proxy;
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proxy_settings m_tracker_proxy;
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#ifndef TORRENT_DISABLE_DHT
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proxy_settings m_dht_proxy;
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#endif
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// set to true when the session object
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// is being destructed and the thread
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// should exit
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volatile bool m_abort;
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// the max number of unchoked peers as set by the user
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int m_max_uploads;
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// the number of unchoked peers as set by the auto-unchoker
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// this should always be >= m_max_uploads
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int m_allowed_upload_slots;
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// the max number of connections, as set by the user
|
|
int m_max_connections;
|
|
|
|
// the number of unchoked peers
|
|
int m_num_unchoked;
|
|
|
|
// this is initialized to the unchoke_interval
|
|
// session_setting and decreased every second.
|
|
// when it reaches zero, it is reset to the
|
|
// unchoke_interval and the unchoke set is
|
|
// recomputed.
|
|
int m_unchoke_time_scaler;
|
|
|
|
// works like unchoke_time_scaler but it
|
|
// is only decresed when the unchoke set
|
|
// is recomputed, and when it reaches zero,
|
|
// the optimistic unchoke is moved to another peer.
|
|
int m_optimistic_unchoke_time_scaler;
|
|
|
|
// works like unchoke_time_scaler. Each time
|
|
// it reaches 0, and all the connections are
|
|
// used, the worst connection will be disconnected
|
|
// from the torrent with the most peers
|
|
int m_disconnect_time_scaler;
|
|
|
|
// statistics gathered from all torrents.
|
|
stat m_stat;
|
|
|
|
// is false by default and set to true when
|
|
// the first incoming connection is established
|
|
// this is used to know if the client is behind
|
|
// NAT or not.
|
|
bool m_incoming_connection;
|
|
|
|
void second_tick(asio::error_code const& e);
|
|
ptime m_last_tick;
|
|
|
|
#ifndef TORRENT_DISABLE_DHT
|
|
boost::intrusive_ptr<dht::dht_tracker> m_dht;
|
|
dht_settings m_dht_settings;
|
|
// if this is set to true, the dht listen port
|
|
// will be set to the same as the tcp listen port
|
|
// and will be synchronlized with it as it changes
|
|
// it defaults to true
|
|
bool m_dht_same_port;
|
|
|
|
// see m_external_listen_port. This is the same
|
|
// but for the udp port used by the DHT.
|
|
int m_external_udp_port;
|
|
|
|
udp_socket m_dht_socket;
|
|
|
|
void on_receive_udp(udp::endpoint const& ep, char const* buf, int len);
|
|
#endif
|
|
|
|
#ifndef TORRENT_DISABLE_ENCRYPTION
|
|
pe_settings m_pe_settings;
|
|
#endif
|
|
|
|
boost::intrusive_ptr<natpmp> m_natpmp;
|
|
boost::intrusive_ptr<upnp> m_upnp;
|
|
boost::intrusive_ptr<lsd> m_lsd;
|
|
|
|
// the timer used to fire the second_tick
|
|
deadline_timer m_timer;
|
|
|
|
// the index of the torrent that will be offered to
|
|
// connect to a peer next time second_tick is called.
|
|
// This implements a round robin.
|
|
int m_next_connect_torrent;
|
|
#ifndef NDEBUG
|
|
void check_invariant() const;
|
|
#endif
|
|
|
|
#ifdef TORRENT_STATS
|
|
// logger used to write bandwidth usage statistics
|
|
std::ofstream m_stats_logger;
|
|
int m_second_counter;
|
|
// used to log send buffer usage statistics
|
|
std::ofstream m_buffer_usage_logger;
|
|
// the number of send buffers that are allocated
|
|
int m_buffer_allocations;
|
|
#endif
|
|
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
|
|
boost::shared_ptr<logger> create_log(std::string const& name
|
|
, int instance, bool append = true);
|
|
|
|
// this list of tracker loggers serves as tracker_callbacks when
|
|
// shutting down. This list is just here to keep them alive during
|
|
// whe shutting down process
|
|
std::list<boost::shared_ptr<tracker_logger> > m_tracker_loggers;
|
|
|
|
fs::path m_logpath;
|
|
public:
|
|
boost::shared_ptr<logger> m_logger;
|
|
private:
|
|
#endif
|
|
|
|
#ifndef TORRENT_DISABLE_EXTENSIONS
|
|
typedef std::list<boost::function<boost::shared_ptr<
|
|
torrent_plugin>(torrent*, void*)> > extension_list_t;
|
|
|
|
extension_list_t m_extensions;
|
|
#endif
|
|
|
|
// data shared between the main thread
|
|
// and the checker thread
|
|
checker_impl m_checker_impl;
|
|
|
|
// the main working thread
|
|
boost::scoped_ptr<boost::thread> m_thread;
|
|
|
|
// the thread that calls initialize_pieces()
|
|
// on all torrents before they start downloading
|
|
boost::scoped_ptr<boost::thread> m_checker_thread;
|
|
};
|
|
|
|
#if defined(TORRENT_LOGGING) || defined(TORRENT_VERBOSE_LOGGING)
|
|
struct tracker_logger : request_callback
|
|
{
|
|
tracker_logger(session_impl& ses): m_ses(ses) {}
|
|
void tracker_warning(std::string const& str)
|
|
{
|
|
debug_log("*** tracker warning: " + str);
|
|
}
|
|
|
|
void tracker_response(tracker_request const&
|
|
, std::vector<peer_entry>& peers
|
|
, int interval
|
|
, int complete
|
|
, int incomplete)
|
|
{
|
|
std::stringstream s;
|
|
s << "TRACKER RESPONSE:\n"
|
|
"interval: " << interval << "\n"
|
|
"peers:\n";
|
|
for (std::vector<peer_entry>::const_iterator i = peers.begin();
|
|
i != peers.end(); ++i)
|
|
{
|
|
s << " " << std::setfill(' ') << std::setw(16) << i->ip
|
|
<< " " << std::setw(5) << std::dec << i->port << " ";
|
|
if (!i->pid.is_all_zeros()) s << " " << i->pid;
|
|
s << "\n";
|
|
}
|
|
debug_log(s.str());
|
|
}
|
|
|
|
void tracker_request_timed_out(
|
|
tracker_request const&)
|
|
{
|
|
debug_log("*** tracker timed out");
|
|
}
|
|
|
|
void tracker_request_error(
|
|
tracker_request const&
|
|
, int response_code
|
|
, const std::string& str)
|
|
{
|
|
debug_log(std::string("*** tracker error: ")
|
|
+ boost::lexical_cast<std::string>(response_code) + ": "
|
|
+ str);
|
|
}
|
|
|
|
void debug_log(const std::string& line)
|
|
{
|
|
(*m_ses.m_logger) << time_now_string() << " " << line << "\n";
|
|
}
|
|
session_impl& m_ses;
|
|
};
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
|
|
#endif
|
|
|