543 lines
15 KiB
C++
543 lines
15 KiB
C++
/*
|
|
|
|
Copyright (c) 2003, 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_POLICY_HPP_INCLUDED
|
|
#define TORRENT_POLICY_HPP_INCLUDED
|
|
|
|
#include <algorithm>
|
|
#include <deque>
|
|
|
|
#include "libtorrent/peer.hpp"
|
|
#include "libtorrent/piece_picker.hpp"
|
|
#include "libtorrent/socket.hpp"
|
|
#include "libtorrent/address.hpp"
|
|
#include "libtorrent/size_type.hpp"
|
|
#include "libtorrent/invariant_check.hpp"
|
|
#include "libtorrent/config.hpp"
|
|
|
|
namespace libtorrent
|
|
{
|
|
|
|
class torrent;
|
|
class peer_connection;
|
|
|
|
// this is compressed as an unsigned floating point value
|
|
// the top 13 bits are the mantissa and the low
|
|
// 3 bits is the unsigned exponent. The exponent
|
|
// has an implicit + 4 as well.
|
|
// This means that the resolution is no less than 16
|
|
// The actual rate is: (upload_rate >> 4) << ((upload_rate & 0xf) + 4)
|
|
// the resolution gets worse the higher the value is
|
|
// min value is 0, max value is 16775168
|
|
struct ufloat16
|
|
{
|
|
ufloat16():m_val(0) {}
|
|
ufloat16(int v)
|
|
{ *this = v; }
|
|
operator int()
|
|
{
|
|
return (m_val >> 3) << ((m_val & 7) + 4);
|
|
}
|
|
|
|
ufloat16& operator=(int v)
|
|
{
|
|
if (v > 0x1fff << (7 + 4)) m_val = 0xffff;
|
|
else if (v <= 0) m_val = 0;
|
|
else
|
|
{
|
|
int exp = 4;
|
|
v >>= 4;
|
|
while (v > 0x1fff)
|
|
{
|
|
v >>= 1;
|
|
++exp;
|
|
}
|
|
TORRENT_ASSERT(exp <= 7);
|
|
m_val = (v << 3) || (exp & 7);
|
|
}
|
|
return *this;
|
|
}
|
|
private:
|
|
unsigned int m_val;
|
|
};
|
|
|
|
enum
|
|
{
|
|
// the limits of the download queue size
|
|
min_request_queue = 2,
|
|
|
|
// the amount of free upload allowed before
|
|
// the peer is choked
|
|
free_upload_amount = 4 * 16 * 1024
|
|
};
|
|
|
|
void request_a_block(torrent& t, peer_connection& c);
|
|
|
|
class TORRENT_EXPORT policy
|
|
{
|
|
public:
|
|
|
|
policy(torrent* t);
|
|
|
|
// this is called every 10 seconds to allow
|
|
// for peer choking management
|
|
void pulse();
|
|
|
|
struct peer;
|
|
|
|
#if TORRENT_USE_I2P
|
|
policy::peer* add_i2p_peer(char const* destination, int source, char flags);
|
|
#endif
|
|
|
|
// this is called once for every peer we get from
|
|
// the tracker, pex, lsd or dht.
|
|
policy::peer* add_peer(const tcp::endpoint& remote, const peer_id& pid
|
|
, int source, char flags);
|
|
|
|
// false means duplicate connection
|
|
bool update_peer_port(int port, policy::peer* p, int src);
|
|
|
|
// called when an incoming connection is accepted
|
|
// false means the connection was refused or failed
|
|
bool new_connection(peer_connection& c, int session_time);
|
|
|
|
// the given connection was just closed
|
|
void connection_closed(const peer_connection& c, int session_time);
|
|
|
|
void ban_peer(policy::peer* p);
|
|
void set_connection(policy::peer* p, peer_connection* c);
|
|
void set_failcount(policy::peer* p, int f);
|
|
|
|
// the peer has got at least one interesting piece
|
|
void peer_is_interesting(peer_connection& c);
|
|
|
|
void ip_filter_updated();
|
|
|
|
void set_seed(policy::peer* p, bool s);
|
|
|
|
#ifdef TORRENT_DEBUG
|
|
bool has_connection(const peer_connection* p);
|
|
|
|
void check_invariant() const;
|
|
#endif
|
|
|
|
// intended struct layout (on 32 bit architectures)
|
|
// offset size alignment field
|
|
// 0 12 1 prev_amount_upload, prev_amount_download
|
|
// 12 4 4 connection
|
|
// 16 2 2 last_optimistically_unchoked
|
|
// 18 2 2 last_connected
|
|
// 20 16 1 addr
|
|
// 36 2 2 port
|
|
// 38 2 2 upload_rate_limit
|
|
// 40 2 2 download_rate_limit
|
|
// 42 1 1 hashfails
|
|
// 43 1 1 failcount, connectable, optimistically_unchoked, seed
|
|
// 44 1 1 fast_reconnects, trust_points
|
|
// 45 1 1 source, pe_support, is_v6_addr
|
|
// 46 1 1 on_parole, banned, added_to_dht, supports_utp,
|
|
// supports_holepunch
|
|
// 47 1 1 <padding>
|
|
// 48
|
|
struct TORRENT_EXPORT peer
|
|
{
|
|
// peer();
|
|
peer(boost::uint16_t port, bool connectable, int src);
|
|
|
|
size_type total_download() const;
|
|
size_type total_upload() const;
|
|
|
|
libtorrent::address address() const;
|
|
char const* dest() const;
|
|
|
|
tcp::endpoint ip() const { return tcp::endpoint(address(), port); }
|
|
|
|
// this is the accumulated amount of
|
|
// uploaded and downloaded data to this
|
|
// peer. It only accounts for what was
|
|
// shared during the last connection to
|
|
// this peer. i.e. These are only updated
|
|
// when the connection is closed. For the
|
|
// total amount of upload and download
|
|
// we'll have to add thes figures with the
|
|
// statistics from the peer_connection.
|
|
// 48 bits can fit 256 Terabytes
|
|
#ifdef __SUNPRO_CC
|
|
unsigned prev_amount_upload:48;
|
|
unsigned prev_amount_download:48;
|
|
#else
|
|
boost::uint64_t prev_amount_upload:48;
|
|
boost::uint64_t prev_amount_download:48;
|
|
#endif
|
|
|
|
// if the peer is connected now, this
|
|
// will refer to a valid peer_connection
|
|
peer_connection* connection;
|
|
|
|
#ifndef TORRENT_DISABLE_GEO_IP
|
|
#ifdef TORRENT_DEBUG
|
|
// only used in debug mode to assert that
|
|
// the first entry in the AS pair keeps the same
|
|
boost::uint16_t inet_as_num;
|
|
#endif
|
|
// The AS this peer belongs to
|
|
std::pair<const int, int>* inet_as;
|
|
#endif
|
|
|
|
// the time when this peer was optimistically unchoked
|
|
// the last time. in seconds since session was created
|
|
// 16 bits is enough to last for 18.2 hours
|
|
// when the session time reaches 18 hours, it jumps back by
|
|
// 9 hours, and all peers' times are updated to be
|
|
// relative to that new time offset
|
|
boost::uint16_t last_optimistically_unchoked;
|
|
|
|
// the time when the peer connected to us
|
|
// or disconnected if it isn't connected right now
|
|
// in number of seconds since session was created
|
|
boost::uint16_t last_connected;
|
|
|
|
// the port this peer is or was connected on
|
|
boost::uint16_t port;
|
|
|
|
// the upload and download rate limits set for this peer
|
|
ufloat16 upload_rate_limit;
|
|
ufloat16 download_rate_limit;
|
|
|
|
// the number of times this peer has been
|
|
// part of a piece that failed the hash check
|
|
boost::uint8_t hashfails;
|
|
|
|
// the number of failed connection attempts
|
|
// this peer has
|
|
unsigned failcount:5; // [0, 31]
|
|
|
|
// incoming peers (that don't advertize their listen port)
|
|
// will not be considered connectable. Peers that
|
|
// we have a listen port for will be assumed to be.
|
|
bool connectable:1;
|
|
|
|
// true if this peer currently is unchoked
|
|
// because of an optimistic unchoke.
|
|
// when the optimistic unchoke is moved to
|
|
// another peer, this peer will be choked
|
|
// if this is true
|
|
bool optimistically_unchoked:1;
|
|
|
|
// this is true if the peer is a seed
|
|
bool seed:1;
|
|
|
|
// the number of times we have allowed a fast
|
|
// reconnect for this peer.
|
|
unsigned fast_reconnects:4;
|
|
|
|
// for every valid piece we receive where this
|
|
// peer was one of the participants, we increase
|
|
// this value. For every invalid piece we receive
|
|
// where this peer was a participant, we decrease
|
|
// this value. If it sinks below a threshold, its
|
|
// considered a bad peer and will be banned.
|
|
signed trust_points:4; // [-7, 8]
|
|
|
|
// a bitmap combining the peer_source flags
|
|
// from peer_info.
|
|
unsigned source:6;
|
|
|
|
#ifndef TORRENT_DISABLE_ENCRYPTION
|
|
// Hints encryption support of peer. Only effective
|
|
// for and when the outgoing encryption policy
|
|
// allows both encrypted and non encrypted
|
|
// connections (pe_settings::out_enc_policy
|
|
// == enabled). The initial state of this flag
|
|
// determines the initial connection attempt
|
|
// type (true = encrypted, false = standard).
|
|
// This will be toggled everytime either an
|
|
// encrypted or non-encrypted handshake fails.
|
|
bool pe_support:1;
|
|
#endif
|
|
|
|
#if TORRENT_USE_IPV6
|
|
// this is true if the v6 union member in addr is
|
|
// the one to use, false if it's the v4 one
|
|
bool is_v6_addr:1;
|
|
#endif
|
|
#if TORRENT_USE_I2P
|
|
// set if the i2p_destination is in use in the addr union
|
|
bool is_i2p_addr:1;
|
|
#endif
|
|
|
|
// if this is true, the peer has previously
|
|
// participated in a piece that failed the piece
|
|
// hash check. This will put the peer on parole
|
|
// and only request entire pieces. If a piece pass
|
|
// that was partially requested from this peer it
|
|
// will leave parole mode and continue download
|
|
// pieces as normal peers.
|
|
bool on_parole:1;
|
|
|
|
// is set to true if this peer has been banned
|
|
bool banned:1;
|
|
|
|
#ifndef TORRENT_DISABLE_DHT
|
|
// this is set to true when this peer as been
|
|
// pinged by the DHT
|
|
bool added_to_dht:1;
|
|
#endif
|
|
// we think this peer supports uTP
|
|
bool supports_utp:1;
|
|
// we have been connected via uTP at least once
|
|
bool confirmed_supports_utp:1;
|
|
bool supports_holepunch:1;
|
|
#ifdef TORRENT_DEBUG
|
|
bool in_use:1;
|
|
#endif
|
|
};
|
|
|
|
struct TORRENT_EXPORT ipv4_peer : peer
|
|
{
|
|
ipv4_peer(tcp::endpoint const& ip, bool connectable, int src);
|
|
|
|
address_v4 addr;
|
|
};
|
|
|
|
#if TORRENT_USE_I2P
|
|
struct TORRENT_EXPORT i2p_peer : peer
|
|
{
|
|
i2p_peer(char const* destination, bool connectable, int src);
|
|
~i2p_peer();
|
|
|
|
char* destination;
|
|
};
|
|
#endif
|
|
|
|
#if TORRENT_USE_IPV6
|
|
struct TORRENT_EXPORT ipv6_peer : peer
|
|
{
|
|
ipv6_peer(tcp::endpoint const& ip, bool connectable, int src);
|
|
|
|
address_v6::bytes_type addr;
|
|
};
|
|
#endif
|
|
|
|
int num_peers() const { return m_peers.size(); }
|
|
|
|
struct peer_address_compare
|
|
{
|
|
bool operator()(
|
|
peer const* lhs, libtorrent::address const& rhs) const
|
|
{
|
|
return lhs->address() < rhs;
|
|
}
|
|
|
|
bool operator()(
|
|
libtorrent::address const& lhs, peer const* rhs) const
|
|
{
|
|
return lhs < rhs->address();
|
|
}
|
|
|
|
#if TORRENT_USE_I2P
|
|
bool operator()(
|
|
peer const* lhs, char const* rhs) const
|
|
{
|
|
return strcmp(lhs->dest(), rhs) < 0;
|
|
}
|
|
|
|
bool operator()(
|
|
char const* lhs, peer const* rhs) const
|
|
{
|
|
return strcmp(lhs, rhs->dest()) < 0;
|
|
}
|
|
#endif
|
|
|
|
bool operator()(
|
|
peer const* lhs, peer const* rhs) const
|
|
{
|
|
#if TORRENT_USE_I2P
|
|
if (rhs->is_i2p_addr == lhs->is_i2p_addr)
|
|
return strcmp(lhs->dest(), rhs->dest()) < 0;
|
|
#endif
|
|
return lhs->address() < rhs->address();
|
|
}
|
|
};
|
|
|
|
typedef std::deque<peer*> peers_t;
|
|
|
|
typedef peers_t::iterator iterator;
|
|
typedef peers_t::const_iterator const_iterator;
|
|
iterator begin_peer() { return m_peers.begin(); }
|
|
iterator end_peer() { return m_peers.end(); }
|
|
const_iterator begin_peer() const { return m_peers.begin(); }
|
|
const_iterator end_peer() const { return m_peers.end(); }
|
|
|
|
std::pair<iterator, iterator> find_peers(address const& a)
|
|
{
|
|
return std::equal_range(
|
|
m_peers.begin(), m_peers.end(), a, peer_address_compare());
|
|
}
|
|
|
|
std::pair<const_iterator, const_iterator> find_peers(address const& a) const
|
|
{
|
|
return std::equal_range(
|
|
m_peers.begin(), m_peers.end(), a, peer_address_compare());
|
|
}
|
|
|
|
bool connect_one_peer(int session_time);
|
|
|
|
bool has_peer(policy::peer const* p) const;
|
|
|
|
int num_seeds() const { return m_num_seeds; }
|
|
int num_connect_candidates() const { return m_num_connect_candidates; }
|
|
void recalculate_connect_candidates();
|
|
|
|
void erase_peer(policy::peer* p);
|
|
void erase_peer(iterator i);
|
|
|
|
private:
|
|
|
|
void update_peer(policy::peer* p, int src, int flags
|
|
, tcp::endpoint const& remote, char const* destination);
|
|
bool insert_peer(policy::peer* p, iterator iter, int flags);
|
|
|
|
bool compare_peer_erase(policy::peer const& lhs, policy::peer const& rhs) const;
|
|
bool compare_peer(policy::peer const& lhs, policy::peer const& rhs
|
|
, address const& external_ip) const;
|
|
|
|
iterator find_connect_candidate(int session_time);
|
|
|
|
bool is_connect_candidate(peer const& p, bool finished) const;
|
|
bool is_erase_candidate(peer const& p, bool finished) const;
|
|
bool should_erase_immediately(peer const& p) const;
|
|
|
|
void erase_peers();
|
|
|
|
peers_t m_peers;
|
|
|
|
torrent* m_torrent;
|
|
|
|
// since the peer list can grow too large
|
|
// to scan all of it, start at this iterator
|
|
int m_round_robin;
|
|
|
|
// The number of peers in our peer list
|
|
// that are connect candidates. i.e. they're
|
|
// not already connected and they have not
|
|
// yet reached their max try count and they
|
|
// have the connectable state (we have a listen
|
|
// port for them).
|
|
int m_num_connect_candidates;
|
|
|
|
// the number of seeds in the peer list
|
|
int m_num_seeds;
|
|
|
|
// this was the state of the torrent the
|
|
// last time we recalculated the number of
|
|
// connect candidates. Since seeds (or upload
|
|
// only) peers are not connect candidates
|
|
// when we're finished, the set depends on
|
|
// this state. Every time m_torrent->is_finished()
|
|
// is different from this state, we need to
|
|
// recalculate the connect candidates.
|
|
bool m_finished:1;
|
|
};
|
|
|
|
inline policy::ipv4_peer::ipv4_peer(
|
|
tcp::endpoint const& ep, bool c, int src
|
|
)
|
|
: peer(ep.port(), c, src)
|
|
, addr(ep.address().to_v4())
|
|
{
|
|
#if TORRENT_USE_IPV6
|
|
is_v6_addr = false;
|
|
#endif
|
|
#if TORRENT_USE_I2P
|
|
is_i2p_addr = false;
|
|
#endif
|
|
}
|
|
|
|
#if TORRENT_USE_I2P
|
|
inline policy::i2p_peer::i2p_peer(char const* dest, bool connectable, int src)
|
|
: peer(0, connectable, src), destination(strdup(dest))
|
|
{
|
|
#if TORRENT_USE_IPV6
|
|
is_v6_addr = false;
|
|
#endif
|
|
is_i2p_addr = true;
|
|
}
|
|
|
|
inline policy::i2p_peer::~i2p_peer()
|
|
{ free(destination); }
|
|
#endif // TORRENT_USE_I2P
|
|
|
|
#if TORRENT_USE_IPV6
|
|
inline policy::ipv6_peer::ipv6_peer(
|
|
tcp::endpoint const& ep, bool c, int src
|
|
)
|
|
: peer(ep.port(), c, src)
|
|
, addr(ep.address().to_v6().to_bytes())
|
|
{
|
|
is_v6_addr = true;
|
|
#if TORRENT_USE_I2P
|
|
is_i2p_addr = false;
|
|
#endif
|
|
}
|
|
|
|
#endif // TORRENT_USE_IPV6
|
|
|
|
#if TORRENT_USE_I2P
|
|
inline char const* policy::peer::dest() const
|
|
{
|
|
if (is_i2p_addr)
|
|
return static_cast<policy::i2p_peer const*>(this)->destination;
|
|
return "";
|
|
}
|
|
#endif
|
|
|
|
inline libtorrent::address policy::peer::address() const
|
|
{
|
|
#if TORRENT_USE_IPV6
|
|
if (is_v6_addr)
|
|
return libtorrent::address_v6(
|
|
static_cast<policy::ipv6_peer const*>(this)->addr);
|
|
else
|
|
#endif
|
|
#if TORRENT_USE_I2P
|
|
if (is_i2p_addr) return libtorrent::address();
|
|
else
|
|
#endif
|
|
return static_cast<policy::ipv4_peer const*>(this)->addr;
|
|
}
|
|
|
|
}
|
|
|
|
#endif // TORRENT_POLICY_HPP_INCLUDED
|
|
|