209 lines
6.9 KiB
C++
209 lines
6.9 KiB
C++
/*
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Copyright (c) 2006-2018, 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_DHT_TRACKER
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#define TORRENT_DHT_TRACKER
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#include <functional>
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#include <libtorrent/kademlia/node.hpp>
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#include <libtorrent/kademlia/dos_blocker.hpp>
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#include <libtorrent/kademlia/dht_state.hpp>
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#include <libtorrent/aux_/listen_socket_handle.hpp>
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#include <libtorrent/socket.hpp>
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#include <libtorrent/deadline_timer.hpp>
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#include <libtorrent/span.hpp>
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#include <libtorrent/io_service.hpp>
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#include <libtorrent/udp_socket.hpp>
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#include <libtorrent/entry.hpp>
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namespace libtorrent {
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struct counters;
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#ifndef TORRENT_NO_DEPRECATE
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struct session_status;
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#endif
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}
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namespace libtorrent { namespace dht {
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struct dht_settings;
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struct TORRENT_EXTRA_EXPORT dht_tracker final
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: socket_manager
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, std::enable_shared_from_this<dht_tracker>
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{
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using send_fun_t = std::function<void(
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aux::listen_socket_handle const&, udp::endpoint const&
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, span<char const>, error_code&, udp_send_flags_t)>;
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dht_tracker(dht_observer* observer
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, io_service& ios
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, send_fun_t const& send_fun
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, dht_settings const& settings
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, counters& cnt
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, dht_storage_interface& storage
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, dht_state state);
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#if defined(_MSC_VER) && _MSC_VER < 1910
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// workaround for a bug in msvc 14.0
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// it attempts to generate a copy constructor for some strange reason
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// and fails because tracker_node is not copyable
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dht_tracker(dht_tracker const&) = delete;
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#endif
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void start(find_data::nodes_callback const& f);
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void stop();
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// tell the node to recalculate its node id based on the current
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// understanding of its external address (which may have changed)
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void update_node_id(aux::listen_socket_handle const& s);
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void new_socket(aux::listen_socket_handle const& s);
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void delete_socket(aux::listen_socket_handle const& s);
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void add_node(udp::endpoint const& node);
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void add_router_node(udp::endpoint const& node);
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dht_state state() const;
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enum flags_t { flag_seed = 1, flag_implied_port = 2 };
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void get_peers(sha1_hash const& ih
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, std::function<void(std::vector<tcp::endpoint> const&)> f);
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void announce(sha1_hash const& ih, int listen_port, int flags
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, std::function<void(std::vector<tcp::endpoint> const&)> f);
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void sample_infohashes(udp::endpoint const& ep, sha1_hash const& target
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, std::function<void(time_duration
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, int, std::vector<sha1_hash>
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, std::vector<std::pair<sha1_hash, udp::endpoint>>)> f);
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void get_item(sha1_hash const& target
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, std::function<void(item const&)> cb);
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// key is a 32-byte binary string, the public key to look up.
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// the salt is optional
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void get_item(public_key const& key
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, std::function<void(item const&, bool)> cb
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, std::string salt = std::string());
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// for immutable_item.
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// the callback function will be called when put operation is done.
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// the int parameter indicates the success numbers of put operation.
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void put_item(entry const& data
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, std::function<void(int)> cb);
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// for mutable_item.
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// the data_cb will be called when we get authoritative mutable_item,
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// the cb is same as put immutable_item.
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void put_item(public_key const& key
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, std::function<void(item const&, int)> cb
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, std::function<void(item&)> data_cb, std::string salt = std::string());
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// send an arbitrary DHT request directly to a node
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void direct_request(udp::endpoint const& ep, entry& e
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, std::function<void(msg const&)> f);
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#ifndef TORRENT_NO_DEPRECATE
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void dht_status(session_status& s);
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#endif
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void dht_status(std::vector<dht_routing_bucket>& table
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, std::vector<dht_lookup>& requests);
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void update_stats_counters(counters& c) const;
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void incoming_error(error_code const& ec, udp::endpoint const& ep);
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bool incoming_packet(aux::listen_socket_handle const& s
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, udp::endpoint const& ep, span<char const> buf);
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std::vector<std::pair<node_id, udp::endpoint>> live_nodes(node_id const& nid);
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private:
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struct tracker_node
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{
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tracker_node(io_service& ios
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, aux::listen_socket_handle const& s, socket_manager* sock
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, dht_settings const& settings
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, node_id const& nid
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, dht_observer* observer, counters& cnt
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, get_foreign_node_t get_foreign_node
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, dht_storage_interface& storage);
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node dht;
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deadline_timer connection_timer;
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};
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using tracker_nodes_t = std::map<aux::listen_socket_handle, tracker_node>;
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std::shared_ptr<dht_tracker> self()
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{ return shared_from_this(); }
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void connection_timeout(aux::listen_socket_handle const& s, error_code const& e);
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void refresh_timeout(error_code const& e);
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void refresh_key(error_code const& e);
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void update_storage_node_ids();
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node* get_node(node_id const& id, std::string const& family_name);
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// implements socket_manager
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bool has_quota() override;
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bool send_packet(aux::listen_socket_handle const& s, entry& e, udp::endpoint const& addr) override;
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// this is the bdecode_node DHT messages are parsed into. It's a member
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// in order to avoid having to deallocate and re-allocate it for every
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// message.
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bdecode_node m_msg;
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counters& m_counters;
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dht_storage_interface& m_storage;
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dht_state m_state; // to be used only once
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tracker_nodes_t m_nodes;
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send_fun_t m_send_fun;
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dht_observer* m_log;
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std::vector<char> m_send_buf;
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dos_blocker m_blocker;
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deadline_timer m_key_refresh_timer;
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deadline_timer m_refresh_timer;
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dht_settings const& m_settings;
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bool m_running;
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// used to resolve hostnames for nodes
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udp::resolver m_host_resolver;
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// state for the send rate limit
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int m_send_quota;
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time_point m_last_tick;
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};
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}}
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#endif
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