271 lines
8.5 KiB
C++
271 lines
8.5 KiB
C++
/*
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Copyright (c) 2012-2013, 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_TORRENT_PEER_HPP_INCLUDED
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#define TORRENT_TORRENT_PEER_HPP_INCLUDED
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#include "libtorrent/config.hpp"
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#include "libtorrent/address.hpp"
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#include "libtorrent/socket.hpp"
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namespace libtorrent
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{
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struct peer_connection_interface;
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struct external_ip;
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// calculate the priority of a peer based on its address. One of the
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// endpoint should be our own. The priority is symmetric, so it doesn't
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// matter which is which
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TORRENT_EXTRA_EXPORT boost::uint32_t peer_priority(
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tcp::endpoint e1, tcp::endpoint e2);
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struct TORRENT_EXTRA_EXPORT torrent_peer
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{
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torrent_peer(boost::uint16_t port, bool connectable, int src);
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boost::uint64_t total_download() const;
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boost::uint64_t total_upload() const;
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boost::uint32_t rank(external_ip const& external, int external_port) const;
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libtorrent::address address() const;
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char const* dest() const;
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tcp::endpoint ip() const { return tcp::endpoint(address(), port); }
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// this is the accumulated amount of
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// uploaded and downloaded data to this
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// torrent_peer. It only accounts for what was
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// shared during the last connection to
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// this torrent_peer. i.e. These are only updated
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// when the connection is closed. For the
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// total amount of upload and download
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// we'll have to add thes figures with the
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// statistics from the peer_connection.
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// since these values don't need to be stored
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// with byte-precision, they specify the number
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// of kiB. i.e. shift left 10 bits to compare to
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// byte counters.
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boost::uint32_t prev_amount_upload;
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boost::uint32_t prev_amount_download;
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// if the torrent_peer is connected now, this
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// will refer to a valid peer_connection
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peer_connection_interface* connection;
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// as computed by hashing our IP with the remote
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// IP of this peer
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// calculated lazily
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mutable boost::uint32_t peer_rank;
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// the time when this torrent_peer was optimistically unchoked
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// the last time. in seconds since session was created
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// 16 bits is enough to last for 18.2 hours
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// when the session time reaches 18 hours, it jumps back by
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// 9 hours, and all peers' times are updated to be
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// relative to that new time offset
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boost::uint16_t last_optimistically_unchoked;
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// the time when the torrent_peer connected to us
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// or disconnected if it isn't connected right now
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// in number of seconds since session was created
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boost::uint16_t last_connected;
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// the port this torrent_peer is or was connected on
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boost::uint16_t port;
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// the number of times this torrent_peer has been
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// part of a piece that failed the hash check
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boost::uint8_t hashfails;
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// the number of failed connection attempts
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// this torrent_peer has
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unsigned failcount:5; // [0, 31]
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// incoming peers (that don't advertize their listen port)
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// will not be considered connectable. Peers that
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// we have a listen port for will be assumed to be.
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bool connectable:1;
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// true if this torrent_peer currently is unchoked
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// because of an optimistic unchoke.
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// when the optimistic unchoke is moved to
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// another torrent_peer, this torrent_peer will be choked
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// if this is true
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bool optimistically_unchoked:1;
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// this is true if the torrent_peer is a seed
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bool seed:1;
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// the number of times we have allowed a fast
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// reconnect for this torrent_peer.
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unsigned fast_reconnects:4;
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// for every valid piece we receive where this
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// torrent_peer was one of the participants, we increase
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// this value. For every invalid piece we receive
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// where this torrent_peer was a participant, we decrease
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// this value. If it sinks below a threshold, its
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// considered a bad torrent_peer and will be banned.
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signed trust_points:4; // [-7, 8]
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// a bitmap combining the peer_source flags
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// from peer_info.
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unsigned source:6;
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#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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// Hints encryption support of torrent_peer. Only effective
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// for and when the outgoing encryption policy
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// allows both encrypted and non encrypted
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// connections (pe_settings::out_enc_policy
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// == enabled). The initial state of this flag
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// determines the initial connection attempt
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// type (true = encrypted, false = standard).
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// This will be toggled everytime either an
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// encrypted or non-encrypted handshake fails.
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bool pe_support:1;
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#endif
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#if TORRENT_USE_IPV6
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// this is true if the v6 union member in addr is
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// the one to use, false if it's the v4 one
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bool is_v6_addr:1;
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#endif
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#if TORRENT_USE_I2P
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// set if the i2p_destination is in use in the addr union
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bool is_i2p_addr:1;
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#endif
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// if this is true, the torrent_peer has previously
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// participated in a piece that failed the piece
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// hash check. This will put the torrent_peer on parole
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// and only request entire pieces. If a piece pass
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// that was partially requested from this torrent_peer it
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// will leave parole mode and continue download
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// pieces as normal peers.
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bool on_parole:1;
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// is set to true if this torrent_peer has been banned
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bool banned:1;
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// we think this torrent_peer supports uTP
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bool supports_utp:1;
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// we have been connected via uTP at least once
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bool confirmed_supports_utp:1;
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bool supports_holepunch:1;
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// this is set to one for web seeds. Web seeds
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// are not stored in the policy m_peers list,
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// and are excempt from connect candidate bookkeeping
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// so, any torrent_peer with the web_seed bit set, is
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// never considered a connect candidate
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bool web_seed:1;
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#if TORRENT_USE_ASSERTS
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bool in_use:1;
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#endif
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};
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struct TORRENT_EXTRA_EXPORT ipv4_peer : torrent_peer
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{
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ipv4_peer(tcp::endpoint const& ip, bool connectable, int src);
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address_v4 addr;
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private:
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ipv4_peer& operator=(ipv4_peer const&);
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};
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#if TORRENT_USE_I2P
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struct TORRENT_EXTRA_EXPORT i2p_peer : torrent_peer
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{
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i2p_peer(char const* destination, bool connectable, int src);
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~i2p_peer();
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char* destination;
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private:
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i2p_peer& operator=(i2p_peer const&);
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};
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#endif
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#if TORRENT_USE_IPV6
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struct TORRENT_EXTRA_EXPORT ipv6_peer : torrent_peer
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{
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ipv6_peer(tcp::endpoint const& ip, bool connectable, int src);
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const address_v6::bytes_type addr;
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private:
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// explicitly disallow assignment, to silence msvc warning
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ipv6_peer& operator=(ipv6_peer const&);
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};
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#endif
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struct peer_address_compare
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{
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bool operator()(
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torrent_peer const* lhs, libtorrent::address const& rhs) const
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{
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return lhs->address() < rhs;
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}
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bool operator()(
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libtorrent::address const& lhs, torrent_peer const* rhs) const
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{
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return lhs < rhs->address();
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}
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#if TORRENT_USE_I2P
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bool operator()(
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torrent_peer const* lhs, char const* rhs) const
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{
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return strcmp(lhs->dest(), rhs) < 0;
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}
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bool operator()(
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char const* lhs, torrent_peer const* rhs) const
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{
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return strcmp(lhs, rhs->dest()) < 0;
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}
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#endif
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bool operator()(
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torrent_peer const* lhs, torrent_peer const* rhs) const
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{
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#if TORRENT_USE_I2P
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if (rhs->is_i2p_addr == lhs->is_i2p_addr)
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return strcmp(lhs->dest(), rhs->dest()) < 0;
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#endif
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return lhs->address() < rhs->address();
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}
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};
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}
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#endif
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