mirror of
https://github.com/transmission/transmission
synced 2024-12-26 09:37:56 +00:00
2434 lines
70 KiB
C
2434 lines
70 KiB
C
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/*
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* This file Copyright (C) 2007-2009 Charles Kerr <charles@transmissionbt.com>
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#include <assert.h>
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#include <errno.h>
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#include <string.h> /* memcpy, memcmp, strstr */
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#include <stdlib.h> /* qsort */
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#include <limits.h> /* INT_MAX */
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#include <event.h>
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#include "transmission.h"
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#include "session.h"
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#include "bandwidth.h"
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#include "bencode.h"
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#include "blocklist.h"
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#include "clients.h"
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#include "completion.h"
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#include "crypto.h"
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#include "fdlimit.h"
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#include "handshake.h"
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#include "inout.h" /* tr_ioTestPiece */
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#include "net.h"
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#include "peer-io.h"
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#include "peer-mgr.h"
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#include "peer-msgs.h"
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#include "ptrarray.h"
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#include "stats.h" /* tr_statsAddUploaded, tr_statsAddDownloaded */
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#include "torrent.h"
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#include "trevent.h"
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#include "utils.h"
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#include "webseed.h"
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enum
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{
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/* how frequently to change which peers are choked */
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RECHOKE_PERIOD_MSEC = ( 10 * 1000 ),
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/* minimum interval for refilling peers' request lists */
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REFILL_PERIOD_MSEC = 400,
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/* how frequently to reallocate bandwidth */
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BANDWIDTH_PERIOD_MSEC = 500,
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/* how frequently to age out old piece request lists */
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REFILL_UPKEEP_PERIOD_MSEC = 10000,
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/* how frequently to decide which peers live and die */
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RECONNECT_PERIOD_MSEC = 500,
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/* when many peers are available, keep idle ones this long */
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MIN_UPLOAD_IDLE_SECS = ( 30 ),
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/* when few peers are available, keep idle ones this long */
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MAX_UPLOAD_IDLE_SECS = ( 60 * 5 ),
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/* max # of peers to ask fer per torrent per reconnect pulse */
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MAX_RECONNECTIONS_PER_PULSE = 16,
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/* max number of peers to ask for per second overall.
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* this throttle is to avoid overloading the router */
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MAX_CONNECTIONS_PER_SECOND = 32,
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/* number of bad pieces a peer is allowed to send before we ban them */
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MAX_BAD_PIECES_PER_PEER = 5,
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/* amount of time to keep a list of request pieces lying around
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before it's considered too old and needs to be rebuilt */
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PIECE_LIST_SHELF_LIFE_SECS = 60,
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/* use for bitwise operations w/peer_atom.myflags */
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MYFLAG_BANNED = 1,
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/* use for bitwise operations w/peer_atom.myflags */
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/* unreachable for now... but not banned.
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* if they try to connect to us it's okay */
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MYFLAG_UNREACHABLE = 2,
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/* the minimum we'll wait before attempting to reconnect to a peer */
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MINIMUM_RECONNECT_INTERVAL_SECS = 5
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};
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/**
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***
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**/
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enum
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{
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UPLOAD_ONLY_UKNOWN,
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UPLOAD_ONLY_YES,
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UPLOAD_ONLY_NO
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};
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/**
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* Peer information that should be kept even before we've connected and
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* after we've disconnected. These are kept in a pool of peer_atoms to decide
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* which ones would make good candidates for connecting to, and to watch out
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* for banned peers.
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*
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* @see tr_peer
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* @see tr_peermsgs
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*/
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struct peer_atom
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{
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uint8_t from;
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uint8_t flags; /* these match the added_f flags */
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uint8_t myflags; /* flags that aren't defined in added_f */
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uint8_t uploadOnly; /* UPLOAD_ONLY_ */
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tr_port port;
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uint16_t numFails;
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tr_address addr;
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time_t time; /* when the peer's connection status last changed */
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time_t piece_data_time;
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};
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struct tr_blockIterator
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{
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time_t expirationDate;
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struct tr_torrent_peers * t;
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tr_block_index_t blockIndex, blockCount, *blocks;
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tr_piece_index_t pieceIndex, pieceCount, *pieces;
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};
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typedef struct tr_torrent_peers
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{
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tr_bool isRunning;
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uint8_t hash[SHA_DIGEST_LENGTH];
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int * pendingRequestCount;
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tr_ptrArray outgoingHandshakes; /* tr_handshake */
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tr_ptrArray pool; /* struct peer_atom */
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tr_ptrArray peers; /* tr_peer */
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tr_ptrArray webseeds; /* tr_webseed */
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tr_timer * refillTimer;
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tr_torrent * tor;
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tr_peer * optimistic; /* the optimistic peer, or NULL if none */
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struct tr_blockIterator * refillQueue; /* used in refillPulse() */
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struct tr_peerMgr * manager;
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}
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Torrent;
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struct tr_peerMgr
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{
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tr_session * session;
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tr_ptrArray incomingHandshakes; /* tr_handshake */
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tr_timer * bandwidthTimer;
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tr_timer * rechokeTimer;
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tr_timer * reconnectTimer;
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tr_timer * refillUpkeepTimer;
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};
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#define tordbg( t, ... ) \
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do { \
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if( tr_deepLoggingIsActive( ) ) \
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tr_deepLog( __FILE__, __LINE__, t->tor->info.name, __VA_ARGS__ ); \
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} while( 0 )
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#define dbgmsg( ... ) \
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do { \
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if( tr_deepLoggingIsActive( ) ) \
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tr_deepLog( __FILE__, __LINE__, NULL, __VA_ARGS__ ); \
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} while( 0 )
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/**
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***
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**/
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static TR_INLINE void
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managerLock( const struct tr_peerMgr * manager )
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{
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tr_globalLock( manager->session );
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}
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static TR_INLINE void
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managerUnlock( const struct tr_peerMgr * manager )
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{
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tr_globalUnlock( manager->session );
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}
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static TR_INLINE void
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torrentLock( Torrent * torrent )
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{
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managerLock( torrent->manager );
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}
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static TR_INLINE void
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torrentUnlock( Torrent * torrent )
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{
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managerUnlock( torrent->manager );
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}
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static TR_INLINE int
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torrentIsLocked( const Torrent * t )
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{
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return tr_globalIsLocked( t->manager->session );
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}
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/**
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***
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**/
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static int
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handshakeCompareToAddr( const void * va, const void * vb )
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{
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const tr_handshake * a = va;
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return tr_compareAddresses( tr_handshakeGetAddr( a, NULL ), vb );
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}
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static int
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handshakeCompare( const void * a, const void * b )
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{
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return handshakeCompareToAddr( a, tr_handshakeGetAddr( b, NULL ) );
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}
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static tr_handshake*
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getExistingHandshake( tr_ptrArray * handshakes,
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const tr_address * addr )
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{
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return tr_ptrArrayFindSorted( handshakes, addr, handshakeCompareToAddr );
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}
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static int
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comparePeerAtomToAddress( const void * va, const void * vb )
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{
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const struct peer_atom * a = va;
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return tr_compareAddresses( &a->addr, vb );
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}
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static int
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comparePeerAtoms( const void * va, const void * vb )
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{
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const struct peer_atom * b = vb;
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return comparePeerAtomToAddress( va, &b->addr );
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}
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/**
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***
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**/
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static Torrent*
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getExistingTorrent( tr_peerMgr * manager,
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const uint8_t * hash )
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{
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tr_torrent * tor = tr_torrentFindFromHash( manager->session, hash );
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return tor == NULL ? NULL : tor->torrentPeers;
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}
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static int
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peerCompare( const void * va, const void * vb )
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{
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const tr_peer * a = va;
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const tr_peer * b = vb;
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return tr_compareAddresses( &a->addr, &b->addr );
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}
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static int
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peerCompareToAddr( const void * va, const void * vb )
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{
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const tr_peer * a = va;
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return tr_compareAddresses( &a->addr, vb );
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}
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static tr_peer*
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getExistingPeer( Torrent * torrent,
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const tr_address * addr )
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{
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assert( torrentIsLocked( torrent ) );
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assert( addr );
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return tr_ptrArrayFindSorted( &torrent->peers, addr, peerCompareToAddr );
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}
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static struct peer_atom*
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getExistingAtom( const Torrent * t,
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const tr_address * addr )
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{
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Torrent * tt = (Torrent*)t;
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assert( torrentIsLocked( t ) );
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return tr_ptrArrayFindSorted( &tt->pool, addr, comparePeerAtomToAddress );
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}
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static tr_bool
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peerIsInUse( const Torrent * ct,
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const tr_address * addr )
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{
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Torrent * t = (Torrent*) ct;
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assert( torrentIsLocked ( t ) );
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return getExistingPeer( t, addr )
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|| getExistingHandshake( &t->outgoingHandshakes, addr )
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|| getExistingHandshake( &t->manager->incomingHandshakes, addr );
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}
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static tr_peer*
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peerConstructor( const tr_address * addr )
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{
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tr_peer * p;
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p = tr_new0( tr_peer, 1 );
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p->addr = *addr;
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return p;
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}
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static tr_peer*
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getPeer( Torrent * torrent,
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const tr_address * addr )
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{
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tr_peer * peer;
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assert( torrentIsLocked( torrent ) );
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peer = getExistingPeer( torrent, addr );
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if( peer == NULL )
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{
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peer = peerConstructor( addr );
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tr_ptrArrayInsertSorted( &torrent->peers, peer, peerCompare );
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}
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return peer;
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}
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static void
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peerDestructor( tr_peer * peer )
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{
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assert( peer );
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if( peer->msgs != NULL )
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{
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tr_peerMsgsUnsubscribe( peer->msgs, peer->msgsTag );
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tr_peerMsgsFree( peer->msgs );
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}
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tr_peerIoClear( peer->io );
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tr_peerIoUnref( peer->io ); /* balanced by the ref in handshakeDoneCB() */
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tr_bitfieldFree( peer->have );
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tr_bitfieldFree( peer->blame );
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tr_free( peer->client );
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tr_free( peer );
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}
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static void
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removePeer( Torrent * t,
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tr_peer * peer )
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{
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tr_peer * removed;
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struct peer_atom * atom;
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assert( torrentIsLocked( t ) );
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atom = getExistingAtom( t, &peer->addr );
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assert( atom );
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atom->time = time( NULL );
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removed = tr_ptrArrayRemoveSorted( &t->peers, peer, peerCompare );
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assert( removed == peer );
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peerDestructor( removed );
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}
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static void
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removeAllPeers( Torrent * t )
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{
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while( !tr_ptrArrayEmpty( &t->peers ) )
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removePeer( t, tr_ptrArrayNth( &t->peers, 0 ) );
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}
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static void blockIteratorFree( struct tr_blockIterator ** inout );
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static void
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torrentDestructor( void * vt )
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{
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Torrent * t = vt;
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uint8_t hash[SHA_DIGEST_LENGTH];
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assert( t );
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assert( !t->isRunning );
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assert( torrentIsLocked( t ) );
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assert( tr_ptrArrayEmpty( &t->outgoingHandshakes ) );
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assert( tr_ptrArrayEmpty( &t->peers ) );
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memcpy( hash, t->hash, SHA_DIGEST_LENGTH );
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tr_timerFree( &t->refillTimer );
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blockIteratorFree( &t->refillQueue );
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tr_ptrArrayDestruct( &t->webseeds, (PtrArrayForeachFunc)tr_webseedFree );
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tr_ptrArrayDestruct( &t->pool, (PtrArrayForeachFunc)tr_free );
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tr_ptrArrayDestruct( &t->outgoingHandshakes, NULL );
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tr_ptrArrayDestruct( &t->peers, NULL );
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tr_free( t->pendingRequestCount );
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tr_free( t );
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}
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static void peerCallbackFunc( void * vpeer,
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void * vevent,
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void * vt );
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static Torrent*
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torrentConstructor( tr_peerMgr * manager,
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tr_torrent * tor )
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{
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int i;
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Torrent * t;
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t = tr_new0( Torrent, 1 );
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t->manager = manager;
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t->tor = tor;
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t->pool = TR_PTR_ARRAY_INIT;
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t->peers = TR_PTR_ARRAY_INIT;
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t->webseeds = TR_PTR_ARRAY_INIT;
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t->outgoingHandshakes = TR_PTR_ARRAY_INIT;
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memcpy( t->hash, tor->info.hash, SHA_DIGEST_LENGTH );
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for( i = 0; i < tor->info.webseedCount; ++i )
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{
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tr_webseed * w =
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tr_webseedNew( tor, tor->info.webseeds[i], peerCallbackFunc, t );
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tr_ptrArrayAppend( &t->webseeds, w );
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}
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return t;
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}
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static int bandwidthPulse ( void * vmgr );
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static int rechokePulse ( void * vmgr );
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static int reconnectPulse ( void * vmgr );
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static int refillUpkeep ( void * vmgr );
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tr_peerMgr*
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tr_peerMgrNew( tr_session * session )
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{
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tr_peerMgr * m = tr_new0( tr_peerMgr, 1 );
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m->session = session;
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m->incomingHandshakes = TR_PTR_ARRAY_INIT;
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m->bandwidthTimer = tr_timerNew( session, bandwidthPulse, m, BANDWIDTH_PERIOD_MSEC );
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m->rechokeTimer = tr_timerNew( session, rechokePulse, m, RECHOKE_PERIOD_MSEC );
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m->reconnectTimer = tr_timerNew( session, reconnectPulse, m, RECONNECT_PERIOD_MSEC );
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m->refillUpkeepTimer = tr_timerNew( session, refillUpkeep, m, REFILL_UPKEEP_PERIOD_MSEC );
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rechokePulse( m );
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return m;
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}
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void
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tr_peerMgrFree( tr_peerMgr * manager )
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{
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managerLock( manager );
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tr_timerFree( &manager->refillUpkeepTimer );
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tr_timerFree( &manager->reconnectTimer );
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tr_timerFree( &manager->rechokeTimer );
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tr_timerFree( &manager->bandwidthTimer );
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/* free the handshakes. Abort invokes handshakeDoneCB(), which removes
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* the item from manager->handshakes, so this is a little roundabout... */
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while( !tr_ptrArrayEmpty( &manager->incomingHandshakes ) )
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tr_handshakeAbort( tr_ptrArrayNth( &manager->incomingHandshakes, 0 ) );
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tr_ptrArrayDestruct( &manager->incomingHandshakes, NULL );
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managerUnlock( manager );
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tr_free( manager );
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}
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static int
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clientIsDownloadingFrom( const tr_peer * peer )
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{
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return peer->clientIsInterested && !peer->clientIsChoked;
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}
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static int
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clientIsUploadingTo( const tr_peer * peer )
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{
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return peer->peerIsInterested && !peer->peerIsChoked;
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}
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/***
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****
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***/
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tr_bool
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tr_peerMgrPeerIsSeed( const tr_torrent * tor,
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const tr_address * addr )
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{
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tr_bool isSeed = FALSE;
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const Torrent * t = tor->torrentPeers;
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const struct peer_atom * atom = getExistingAtom( t, addr );
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if( atom )
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isSeed = ( atom->flags & ADDED_F_SEED_FLAG ) != 0;
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return isSeed;
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}
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/****
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*****
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***** REFILL
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*****
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****/
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static void
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assertValidPiece( Torrent * t, tr_piece_index_t piece )
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{
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assert( t );
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assert( t->tor );
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assert( piece < t->tor->info.pieceCount );
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}
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static int
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getPieceRequests( Torrent * t, tr_piece_index_t piece )
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{
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assertValidPiece( t, piece );
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return t->pendingRequestCount ? t->pendingRequestCount[piece] : 0;
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}
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static void
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incrementPieceRequests( Torrent * t, tr_piece_index_t piece )
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{
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assertValidPiece( t, piece );
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if( t->pendingRequestCount == NULL )
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t->pendingRequestCount = tr_new0( int, t->tor->info.pieceCount );
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t->pendingRequestCount[piece]++;
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}
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static void
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decrementPieceRequests( Torrent * t, tr_piece_index_t piece )
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{
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assertValidPiece( t, piece );
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if( t->pendingRequestCount )
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t->pendingRequestCount[piece]--;
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}
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struct tr_refill_piece
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{
|
|
tr_priority_t priority;
|
|
uint32_t piece;
|
|
uint32_t peerCount;
|
|
int random;
|
|
int pendingRequestCount;
|
|
int missingBlockCount;
|
|
};
|
|
|
|
static int
|
|
compareRefillPiece( const void * aIn, const void * bIn )
|
|
{
|
|
const struct tr_refill_piece * a = aIn;
|
|
const struct tr_refill_piece * b = bIn;
|
|
|
|
/* if one piece has a higher priority, it goes first */
|
|
if( a->priority != b->priority )
|
|
return a->priority > b->priority ? -1 : 1;
|
|
|
|
/* have a per-priority endgame */
|
|
if( a->pendingRequestCount != b->pendingRequestCount )
|
|
return a->pendingRequestCount < b->pendingRequestCount ? -1 : 1;
|
|
|
|
/* fewer missing pieces goes first */
|
|
if( a->missingBlockCount != b->missingBlockCount )
|
|
return a->missingBlockCount < b->missingBlockCount ? -1 : 1;
|
|
|
|
/* otherwise if one has fewer peers, it goes first */
|
|
if( a->peerCount != b->peerCount )
|
|
return a->peerCount < b->peerCount ? -1 : 1;
|
|
|
|
/* otherwise go with our random seed */
|
|
if( a->random != b->random )
|
|
return a->random < b->random ? -1 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static tr_piece_index_t *
|
|
getPreferredPieces( Torrent * t, tr_piece_index_t * pieceCount )
|
|
{
|
|
const tr_torrent * tor = t->tor;
|
|
const tr_info * inf = &tor->info;
|
|
tr_piece_index_t i;
|
|
tr_piece_index_t poolSize = 0;
|
|
tr_piece_index_t * pool = tr_new( tr_piece_index_t , inf->pieceCount );
|
|
int peerCount;
|
|
const tr_peer ** peers;
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
peers = (const tr_peer**) tr_ptrArrayBase( &t->peers );
|
|
peerCount = tr_ptrArraySize( &t->peers );
|
|
|
|
/* make a list of the pieces that we want but don't have */
|
|
for( i = 0; i < inf->pieceCount; ++i )
|
|
if( !tor->info.pieces[i].dnd
|
|
&& !tr_cpPieceIsComplete( &tor->completion, i ) )
|
|
pool[poolSize++] = i;
|
|
|
|
/* sort the pool by which to request next */
|
|
if( poolSize > 1 )
|
|
{
|
|
tr_piece_index_t j;
|
|
struct tr_refill_piece * p = tr_new( struct tr_refill_piece, poolSize );
|
|
|
|
for( j = 0; j < poolSize; ++j )
|
|
{
|
|
int k;
|
|
const tr_piece_index_t piece = pool[j];
|
|
struct tr_refill_piece * setme = p + j;
|
|
|
|
setme->piece = piece;
|
|
setme->priority = inf->pieces[piece].priority;
|
|
setme->peerCount = 0;
|
|
setme->random = tr_cryptoWeakRandInt( INT_MAX );
|
|
setme->pendingRequestCount = getPieceRequests( t, piece );
|
|
setme->missingBlockCount
|
|
= tr_cpMissingBlocksInPiece( &tor->completion, piece );
|
|
|
|
for( k = 0; k < peerCount; ++k )
|
|
{
|
|
const tr_peer * peer = peers[k];
|
|
if( peer->peerIsInterested
|
|
&& !peer->clientIsChoked
|
|
&& tr_bitfieldHas( peer->have, piece ) )
|
|
++setme->peerCount;
|
|
}
|
|
}
|
|
|
|
qsort( p, poolSize, sizeof( struct tr_refill_piece ),
|
|
compareRefillPiece );
|
|
|
|
for( j = 0; j < poolSize; ++j )
|
|
pool[j] = p[j].piece;
|
|
|
|
tr_free( p );
|
|
}
|
|
|
|
*pieceCount = poolSize;
|
|
return pool;
|
|
}
|
|
|
|
static struct tr_blockIterator*
|
|
blockIteratorNew( Torrent * t )
|
|
{
|
|
struct tr_blockIterator * i = tr_new0( struct tr_blockIterator, 1 );
|
|
i->expirationDate = time( NULL ) + PIECE_LIST_SHELF_LIFE_SECS;
|
|
i->t = t;
|
|
i->pieces = getPreferredPieces( t, &i->pieceCount );
|
|
i->blocks = tr_new0( tr_block_index_t, t->tor->blockCountInPiece );
|
|
tordbg( t, "creating new refill queue.. it contains %"PRIu32" pieces", i->pieceCount );
|
|
return i;
|
|
}
|
|
|
|
static tr_bool
|
|
blockIteratorNext( struct tr_blockIterator * i, tr_block_index_t * setme )
|
|
{
|
|
tr_bool found;
|
|
Torrent * t = i->t;
|
|
tr_torrent * tor = t->tor;
|
|
|
|
while( ( i->blockIndex == i->blockCount )
|
|
&& ( i->pieceIndex < i->pieceCount ) )
|
|
{
|
|
const tr_piece_index_t index = i->pieces[i->pieceIndex++];
|
|
const tr_block_index_t b = tr_torPieceFirstBlock( tor, index );
|
|
const tr_block_index_t e = b + tr_torPieceCountBlocks( tor, index );
|
|
tr_block_index_t block;
|
|
|
|
assert( index < tor->info.pieceCount );
|
|
|
|
i->blockCount = 0;
|
|
i->blockIndex = 0;
|
|
for( block=b; block!=e; ++block )
|
|
if( !tr_cpBlockIsComplete( &tor->completion, block ) )
|
|
i->blocks[i->blockCount++] = block;
|
|
}
|
|
|
|
assert( i->blockCount <= tor->blockCountInPiece );
|
|
|
|
if(( found = ( i->blockIndex < i->blockCount )))
|
|
*setme = i->blocks[i->blockIndex++];
|
|
|
|
return found;
|
|
}
|
|
|
|
static void
|
|
blockIteratorSkipCurrentPiece( struct tr_blockIterator * i )
|
|
{
|
|
i->blockIndex = i->blockCount;
|
|
}
|
|
|
|
static void
|
|
blockIteratorFree( struct tr_blockIterator ** inout )
|
|
{
|
|
struct tr_blockIterator * it = *inout;
|
|
|
|
if( it != NULL )
|
|
{
|
|
tr_free( it->blocks );
|
|
tr_free( it->pieces );
|
|
tr_free( it );
|
|
}
|
|
|
|
*inout = NULL;
|
|
}
|
|
|
|
static tr_peer**
|
|
getPeersUploadingToClient( Torrent * t,
|
|
int * setmeCount )
|
|
{
|
|
int j;
|
|
int peerCount = 0;
|
|
int retCount = 0;
|
|
tr_peer ** peers = (tr_peer **) tr_ptrArrayPeek( &t->peers, &peerCount );
|
|
tr_peer ** ret = tr_new( tr_peer *, peerCount );
|
|
|
|
j = 0; /* this is a temporary test to make sure we walk through all the peers */
|
|
if( peerCount )
|
|
{
|
|
/* Get a list of peers we're downloading from.
|
|
Pick a different starting point each time so all peers
|
|
get a chance at being the first in line */
|
|
const int fencepost = tr_cryptoWeakRandInt( peerCount );
|
|
int i = fencepost;
|
|
do {
|
|
if( clientIsDownloadingFrom( peers[i] ) )
|
|
ret[retCount++] = peers[i];
|
|
i = ( i + 1 ) % peerCount;
|
|
++j;
|
|
} while( i != fencepost );
|
|
}
|
|
assert( j == peerCount );
|
|
*setmeCount = retCount;
|
|
return ret;
|
|
}
|
|
|
|
static uint32_t
|
|
getBlockOffsetInPiece( const tr_torrent * tor, uint64_t b )
|
|
{
|
|
const uint64_t piecePos = tor->info.pieceSize * tr_torBlockPiece( tor, b );
|
|
const uint64_t blockPos = tor->blockSize * b;
|
|
assert( blockPos >= piecePos );
|
|
return (uint32_t)( blockPos - piecePos );
|
|
}
|
|
|
|
static int
|
|
refillUpkeep( void * vmgr )
|
|
{
|
|
tr_torrent * tor = NULL;
|
|
tr_peerMgr * mgr = vmgr;
|
|
time_t now;
|
|
managerLock( mgr );
|
|
|
|
now = time( NULL );
|
|
while(( tor = tr_torrentNext( mgr->session, tor ))) {
|
|
Torrent * t = tor->torrentPeers;
|
|
if( t && t->refillQueue && ( t->refillQueue->expirationDate <= now ) ) {
|
|
tordbg( t, "refill queue is past its shelf date; discarding." );
|
|
blockIteratorFree( &t->refillQueue );
|
|
}
|
|
}
|
|
|
|
managerUnlock( mgr );
|
|
return TRUE;
|
|
}
|
|
|
|
static int
|
|
refillPulse( void * vtorrent )
|
|
{
|
|
tr_block_index_t block;
|
|
int peerCount;
|
|
int webseedCount;
|
|
tr_peer ** peers;
|
|
tr_webseed ** webseeds;
|
|
Torrent * t = vtorrent;
|
|
tr_torrent * tor = t->tor;
|
|
tr_bool hasNext = TRUE;
|
|
|
|
if( !t->isRunning )
|
|
return TRUE;
|
|
if( tr_torrentIsSeed( t->tor ) )
|
|
return TRUE;
|
|
|
|
torrentLock( t );
|
|
tordbg( t, "Refilling Request Buffers..." );
|
|
|
|
if( t->refillQueue == NULL )
|
|
t->refillQueue = blockIteratorNew( t );
|
|
|
|
peers = getPeersUploadingToClient( t, &peerCount );
|
|
webseedCount = tr_ptrArraySize( &t->webseeds );
|
|
webseeds = tr_memdup( tr_ptrArrayBase( &t->webseeds ),
|
|
webseedCount * sizeof( tr_webseed* ) );
|
|
|
|
while( ( webseedCount || peerCount )
|
|
&& (( hasNext = blockIteratorNext( t->refillQueue, &block ))) )
|
|
{
|
|
int j;
|
|
tr_bool handled = FALSE;
|
|
|
|
const tr_piece_index_t index = tr_torBlockPiece( tor, block );
|
|
const uint32_t offset = getBlockOffsetInPiece( tor, block );
|
|
const uint32_t length = tr_torBlockCountBytes( tor, block );
|
|
|
|
assert( block < tor->blockCount );
|
|
|
|
/* find a peer who can ask for this block */
|
|
for( j=0; !handled && j<peerCount; )
|
|
{
|
|
const tr_addreq_t val = tr_peerMsgsAddRequest( peers[j]->msgs, index, offset, length );
|
|
switch( val )
|
|
{
|
|
case TR_ADDREQ_FULL:
|
|
case TR_ADDREQ_CLIENT_CHOKED:
|
|
peers[j] = peers[--peerCount];
|
|
break;
|
|
|
|
case TR_ADDREQ_MISSING:
|
|
case TR_ADDREQ_DUPLICATE:
|
|
++j;
|
|
break;
|
|
|
|
case TR_ADDREQ_OK:
|
|
incrementPieceRequests( t, index );
|
|
handled = TRUE;
|
|
break;
|
|
|
|
default:
|
|
assert( 0 && "unhandled value" );
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* maybe one of the webseeds can do it */
|
|
for( j=0; !handled && j<webseedCount; )
|
|
{
|
|
const tr_addreq_t val = tr_webseedAddRequest( webseeds[j], index, offset, length );
|
|
switch( val )
|
|
{
|
|
case TR_ADDREQ_FULL:
|
|
webseeds[j] = webseeds[--webseedCount];
|
|
break;
|
|
|
|
case TR_ADDREQ_OK:
|
|
incrementPieceRequests( t, index );
|
|
handled = TRUE;
|
|
break;
|
|
|
|
default:
|
|
assert( 0 && "unhandled value" );
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( !handled )
|
|
blockIteratorSkipCurrentPiece( t->refillQueue );
|
|
}
|
|
|
|
/* cleanup */
|
|
tr_free( webseeds );
|
|
tr_free( peers );
|
|
|
|
if( !hasNext ) {
|
|
tordbg( t, "refill queue has no more blocks to request... freeing (webseed count: %d, peer count: %d)", webseedCount, peerCount );
|
|
blockIteratorFree( &t->refillQueue );
|
|
}
|
|
|
|
t->refillTimer = NULL;
|
|
torrentUnlock( t );
|
|
return FALSE;
|
|
}
|
|
|
|
static void
|
|
broadcastGotBlock( Torrent * t, uint32_t index, uint32_t offset, uint32_t length )
|
|
{
|
|
size_t i;
|
|
size_t peerCount;
|
|
tr_peer ** peers;
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
tordbg( t, "got a block; cancelling any duplicate requests from peers %"PRIu32":%"PRIu32"->%"PRIu32, index, offset, length );
|
|
|
|
peerCount = tr_ptrArraySize( &t->peers );
|
|
peers = (tr_peer**) tr_ptrArrayBase( &t->peers );
|
|
for( i=0; i<peerCount; ++i )
|
|
if( peers[i]->msgs )
|
|
tr_peerMsgsCancel( peers[i]->msgs, index, offset, length );
|
|
}
|
|
|
|
static void
|
|
addStrike( Torrent * t,
|
|
tr_peer * peer )
|
|
{
|
|
tordbg( t, "increasing peer %s strike count to %d",
|
|
tr_peerIoAddrStr( &peer->addr,
|
|
peer->port ), peer->strikes + 1 );
|
|
|
|
if( ++peer->strikes >= MAX_BAD_PIECES_PER_PEER )
|
|
{
|
|
struct peer_atom * atom = getExistingAtom( t, &peer->addr );
|
|
atom->myflags |= MYFLAG_BANNED;
|
|
peer->doPurge = 1;
|
|
tordbg( t, "banning peer %s", tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
}
|
|
}
|
|
|
|
static void
|
|
gotBadPiece( Torrent * t,
|
|
tr_piece_index_t pieceIndex )
|
|
{
|
|
tr_torrent * tor = t->tor;
|
|
const uint32_t byteCount = tr_torPieceCountBytes( tor, pieceIndex );
|
|
|
|
tor->corruptCur += byteCount;
|
|
tor->downloadedCur -= MIN( tor->downloadedCur, byteCount );
|
|
}
|
|
|
|
static void
|
|
refillSoon( Torrent * t )
|
|
{
|
|
if( t->refillTimer == NULL )
|
|
t->refillTimer = tr_timerNew( t->manager->session,
|
|
refillPulse, t,
|
|
REFILL_PERIOD_MSEC );
|
|
}
|
|
|
|
static void
|
|
peerSuggestedPiece( Torrent * t UNUSED,
|
|
tr_peer * peer UNUSED,
|
|
tr_piece_index_t pieceIndex UNUSED,
|
|
int isFastAllowed UNUSED )
|
|
{
|
|
#if 0
|
|
assert( t );
|
|
assert( peer );
|
|
assert( peer->msgs );
|
|
|
|
/* is this a valid piece? */
|
|
if( pieceIndex >= t->tor->info.pieceCount )
|
|
return;
|
|
|
|
/* don't ask for it if we've already got it */
|
|
if( tr_cpPieceIsComplete( t->tor->completion, pieceIndex ) )
|
|
return;
|
|
|
|
/* don't ask for it if they don't have it */
|
|
if( !tr_bitfieldHas( peer->have, pieceIndex ) )
|
|
return;
|
|
|
|
/* don't ask for it if we're choked and it's not fast */
|
|
if( !isFastAllowed && peer->clientIsChoked )
|
|
return;
|
|
|
|
/* request the blocks that we don't have in this piece */
|
|
{
|
|
tr_block_index_t block;
|
|
const tr_torrent * tor = t->tor;
|
|
const tr_block_index_t start = tr_torPieceFirstBlock( tor, pieceIndex );
|
|
const tr_block_index_t end = start + tr_torPieceCountBlocks( tor, pieceIndex );
|
|
|
|
for( block=start; block<end; ++block )
|
|
{
|
|
if( !tr_cpBlockIsComplete( tor->completion, block ) )
|
|
{
|
|
const uint32_t offset = getBlockOffsetInPiece( tor, block );
|
|
const uint32_t length = tr_torBlockCountBytes( tor, block );
|
|
tr_peerMsgsAddRequest( peer->msgs, pieceIndex, offset, length );
|
|
incrementPieceRequests( t, pieceIndex );
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
peerCallbackFunc( void * vpeer, void * vevent, void * vt )
|
|
{
|
|
tr_peer * peer = vpeer; /* may be NULL if peer is a webseed */
|
|
Torrent * t = vt;
|
|
const tr_peer_event * e = vevent;
|
|
|
|
torrentLock( t );
|
|
|
|
switch( e->eventType )
|
|
{
|
|
case TR_PEER_UPLOAD_ONLY:
|
|
/* update our atom */
|
|
if( peer ) {
|
|
struct peer_atom * a = getExistingAtom( t, &peer->addr );
|
|
a->uploadOnly = e->uploadOnly ? UPLOAD_ONLY_YES : UPLOAD_ONLY_NO;
|
|
}
|
|
break;
|
|
|
|
case TR_PEER_NEED_REQ:
|
|
refillSoon( t );
|
|
break;
|
|
|
|
case TR_PEER_CANCEL:
|
|
decrementPieceRequests( t, e->pieceIndex );
|
|
break;
|
|
|
|
case TR_PEER_PEER_GOT_DATA:
|
|
{
|
|
const time_t now = time( NULL );
|
|
tr_torrent * tor = t->tor;
|
|
|
|
tor->activityDate = now;
|
|
|
|
if( e->wasPieceData )
|
|
tor->uploadedCur += e->length;
|
|
|
|
/* update the stats */
|
|
if( e->wasPieceData )
|
|
tr_statsAddUploaded( tor->session, e->length );
|
|
|
|
/* update our atom */
|
|
if( peer ) {
|
|
struct peer_atom * a = getExistingAtom( t, &peer->addr );
|
|
if( e->wasPieceData )
|
|
a->piece_data_time = now;
|
|
}
|
|
|
|
tr_torrentCheckSeedRatio( tor );
|
|
|
|
break;
|
|
}
|
|
|
|
case TR_PEER_CLIENT_GOT_SUGGEST:
|
|
if( peer )
|
|
peerSuggestedPiece( t, peer, e->pieceIndex, FALSE );
|
|
break;
|
|
|
|
case TR_PEER_CLIENT_GOT_ALLOWED_FAST:
|
|
if( peer )
|
|
peerSuggestedPiece( t, peer, e->pieceIndex, TRUE );
|
|
break;
|
|
|
|
case TR_PEER_CLIENT_GOT_DATA:
|
|
{
|
|
const time_t now = time( NULL );
|
|
tr_torrent * tor = t->tor;
|
|
tor->activityDate = now;
|
|
|
|
/* only add this to downloadedCur if we got it from a peer --
|
|
* webseeds shouldn't count against our ratio. As one tracker
|
|
* admin put it, "Those pieces are downloaded directly from the
|
|
* content distributor, not the peers, it is the tracker's job
|
|
* to manage the swarms, not the web server and does not fit
|
|
* into the jurisdiction of the tracker." */
|
|
if( peer && e->wasPieceData )
|
|
tor->downloadedCur += e->length;
|
|
|
|
/* update the stats */
|
|
if( e->wasPieceData )
|
|
tr_statsAddDownloaded( tor->session, e->length );
|
|
|
|
/* update our atom */
|
|
if( peer ) {
|
|
struct peer_atom * a = getExistingAtom( t, &peer->addr );
|
|
if( e->wasPieceData )
|
|
a->piece_data_time = now;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case TR_PEER_PEER_PROGRESS:
|
|
{
|
|
if( peer )
|
|
{
|
|
struct peer_atom * atom = getExistingAtom( t, &peer->addr );
|
|
const int peerIsSeed = e->progress >= 1.0;
|
|
if( peerIsSeed ) {
|
|
tordbg( t, "marking peer %s as a seed", tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
atom->flags |= ADDED_F_SEED_FLAG;
|
|
} else {
|
|
tordbg( t, "marking peer %s as a non-seed", tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
atom->flags &= ~ADDED_F_SEED_FLAG;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case TR_PEER_CLIENT_GOT_BLOCK:
|
|
{
|
|
tr_torrent * tor = t->tor;
|
|
|
|
tr_block_index_t block = _tr_block( tor, e->pieceIndex, e->offset );
|
|
|
|
tr_cpBlockAdd( &tor->completion, block );
|
|
decrementPieceRequests( t, e->pieceIndex );
|
|
|
|
broadcastGotBlock( t, e->pieceIndex, e->offset, e->length );
|
|
|
|
if( tr_cpPieceIsComplete( &tor->completion, e->pieceIndex ) )
|
|
{
|
|
const tr_piece_index_t p = e->pieceIndex;
|
|
const tr_bool ok = tr_ioTestPiece( tor, p, NULL, 0 );
|
|
|
|
if( !ok )
|
|
{
|
|
tr_torerr( tor, _( "Piece %lu, which was just downloaded, failed its checksum test" ),
|
|
(unsigned long)p );
|
|
}
|
|
|
|
tr_torrentSetHasPiece( tor, p, ok );
|
|
tr_torrentSetPieceChecked( tor, p, TRUE );
|
|
tr_peerMgrSetBlame( tor, p, ok );
|
|
|
|
if( !ok )
|
|
{
|
|
gotBadPiece( t, p );
|
|
}
|
|
else
|
|
{
|
|
int i;
|
|
int peerCount;
|
|
tr_peer ** peers;
|
|
tr_file_index_t fileIndex;
|
|
|
|
peerCount = tr_ptrArraySize( &t->peers );
|
|
peers = (tr_peer**) tr_ptrArrayBase( &t->peers );
|
|
for( i=0; i<peerCount; ++i )
|
|
tr_peerMsgsHave( peers[i]->msgs, p );
|
|
|
|
for( fileIndex=0; fileIndex<tor->info.fileCount; ++fileIndex )
|
|
{
|
|
const tr_file * file = &tor->info.files[fileIndex];
|
|
if( ( file->firstPiece <= p ) && ( p <= file->lastPiece ) && tr_cpFileIsComplete( &tor->completion, fileIndex ) )
|
|
{
|
|
char * path = tr_buildPath( tor->downloadDir, file->name, NULL );
|
|
tordbg( t, "closing recently-completed file \"%s\"", path );
|
|
tr_fdFileClose( path );
|
|
tr_free( path );
|
|
}
|
|
}
|
|
}
|
|
|
|
tr_torrentRecheckCompleteness( tor );
|
|
}
|
|
break;
|
|
}
|
|
|
|
case TR_PEER_ERROR:
|
|
if( e->err == EINVAL )
|
|
{
|
|
addStrike( t, peer );
|
|
peer->doPurge = 1;
|
|
tordbg( t, "setting %s doPurge flag because we got an EINVAL error", tr_peerIoAddrStr( &peer->addr, peer->port ) );
|
|
}
|
|
else if( ( e->err == ERANGE )
|
|
|| ( e->err == EMSGSIZE )
|
|
|| ( e->err == ENOTCONN ) )
|
|
{
|
|
/* some protocol error from the peer */
|
|
peer->doPurge = 1;
|
|
tordbg( t, "setting %s doPurge flag because we got an ERANGE, EMSGSIZE, or ENOTCONN error", tr_peerIoAddrStr( &peer->addr, peer->port ) );
|
|
}
|
|
else /* a local error, such as an IO error */
|
|
{
|
|
t->tor->error = e->err;
|
|
tr_strlcpy( t->tor->errorString,
|
|
tr_strerror( t->tor->error ),
|
|
sizeof( t->tor->errorString ) );
|
|
tr_torrentStop( t->tor );
|
|
}
|
|
break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
}
|
|
|
|
torrentUnlock( t );
|
|
}
|
|
|
|
static void
|
|
ensureAtomExists( Torrent * t,
|
|
const tr_address * addr,
|
|
tr_port port,
|
|
uint8_t flags,
|
|
uint8_t from )
|
|
{
|
|
if( getExistingAtom( t, addr ) == NULL )
|
|
{
|
|
struct peer_atom * a;
|
|
a = tr_new0( struct peer_atom, 1 );
|
|
a->addr = *addr;
|
|
a->port = port;
|
|
a->flags = flags;
|
|
a->from = from;
|
|
tordbg( t, "got a new atom: %s", tr_peerIoAddrStr( &a->addr, a->port ) );
|
|
tr_ptrArrayInsertSorted( &t->pool, a, comparePeerAtoms );
|
|
}
|
|
}
|
|
|
|
static int
|
|
getMaxPeerCount( const tr_torrent * tor )
|
|
{
|
|
return tor->maxConnectedPeers;
|
|
}
|
|
|
|
static int
|
|
getPeerCount( const Torrent * t )
|
|
{
|
|
return tr_ptrArraySize( &t->peers );// + tr_ptrArraySize( &t->outgoingHandshakes );
|
|
}
|
|
|
|
/* FIXME: this is kind of a mess. */
|
|
static tr_bool
|
|
myHandshakeDoneCB( tr_handshake * handshake,
|
|
tr_peerIo * io,
|
|
tr_bool isConnected,
|
|
const uint8_t * peer_id,
|
|
void * vmanager )
|
|
{
|
|
tr_bool ok = isConnected;
|
|
tr_bool success = FALSE;
|
|
tr_port port;
|
|
const tr_address * addr;
|
|
tr_peerMgr * manager = vmanager;
|
|
Torrent * t;
|
|
tr_handshake * ours;
|
|
|
|
assert( io );
|
|
assert( tr_isBool( ok ) );
|
|
|
|
t = tr_peerIoHasTorrentHash( io )
|
|
? getExistingTorrent( manager, tr_peerIoGetTorrentHash( io ) )
|
|
: NULL;
|
|
|
|
if( tr_peerIoIsIncoming ( io ) )
|
|
ours = tr_ptrArrayRemoveSorted( &manager->incomingHandshakes,
|
|
handshake, handshakeCompare );
|
|
else if( t )
|
|
ours = tr_ptrArrayRemoveSorted( &t->outgoingHandshakes,
|
|
handshake, handshakeCompare );
|
|
else
|
|
ours = handshake;
|
|
|
|
assert( ours );
|
|
assert( ours == handshake );
|
|
|
|
if( t )
|
|
torrentLock( t );
|
|
|
|
addr = tr_peerIoGetAddress( io, &port );
|
|
|
|
if( !ok || !t || !t->isRunning )
|
|
{
|
|
if( t )
|
|
{
|
|
struct peer_atom * atom = getExistingAtom( t, addr );
|
|
if( atom )
|
|
++atom->numFails;
|
|
}
|
|
}
|
|
else /* looking good */
|
|
{
|
|
struct peer_atom * atom;
|
|
ensureAtomExists( t, addr, port, 0, TR_PEER_FROM_INCOMING );
|
|
atom = getExistingAtom( t, addr );
|
|
atom->time = time( NULL );
|
|
atom->piece_data_time = 0;
|
|
|
|
if( atom->myflags & MYFLAG_BANNED )
|
|
{
|
|
tordbg( t, "banned peer %s tried to reconnect",
|
|
tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
}
|
|
else if( tr_peerIoIsIncoming( io )
|
|
&& ( getPeerCount( t ) >= getMaxPeerCount( t->tor ) ) )
|
|
|
|
{
|
|
}
|
|
else
|
|
{
|
|
tr_peer * peer = getExistingPeer( t, addr );
|
|
|
|
if( peer ) /* we already have this peer */
|
|
{
|
|
}
|
|
else
|
|
{
|
|
peer = getPeer( t, addr );
|
|
tr_free( peer->client );
|
|
|
|
if( !peer_id )
|
|
peer->client = NULL;
|
|
else {
|
|
char client[128];
|
|
tr_clientForId( client, sizeof( client ), peer_id );
|
|
peer->client = tr_strdup( client );
|
|
}
|
|
|
|
peer->port = port;
|
|
peer->io = tr_handshakeStealIO( handshake ); /* this steals its refcount too, which is
|
|
balanced by our unref in peerDestructor() */
|
|
tr_peerIoSetParent( peer->io, t->tor->bandwidth );
|
|
tr_peerMsgsNew( t->tor, peer, peerCallbackFunc, t, &peer->msgsTag );
|
|
|
|
success = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( t )
|
|
torrentUnlock( t );
|
|
|
|
return success;
|
|
}
|
|
|
|
void
|
|
tr_peerMgrAddIncoming( tr_peerMgr * manager,
|
|
tr_address * addr,
|
|
tr_port port,
|
|
int socket )
|
|
{
|
|
managerLock( manager );
|
|
|
|
if( tr_sessionIsAddressBlocked( manager->session, addr ) )
|
|
{
|
|
tr_dbg( "Banned IP address \"%s\" tried to connect to us", tr_ntop_non_ts( addr ) );
|
|
tr_netClose( socket );
|
|
}
|
|
else if( getExistingHandshake( &manager->incomingHandshakes, addr ) )
|
|
{
|
|
tr_netClose( socket );
|
|
}
|
|
else /* we don't have a connetion to them yet... */
|
|
{
|
|
tr_peerIo * io;
|
|
tr_handshake * handshake;
|
|
|
|
io = tr_peerIoNewIncoming( manager->session, manager->session->bandwidth, addr, port, socket );
|
|
|
|
handshake = tr_handshakeNew( io,
|
|
manager->session->encryptionMode,
|
|
myHandshakeDoneCB,
|
|
manager );
|
|
|
|
tr_peerIoUnref( io ); /* balanced by the implicit ref in tr_peerIoNewIncoming() */
|
|
|
|
tr_ptrArrayInsertSorted( &manager->incomingHandshakes, handshake,
|
|
handshakeCompare );
|
|
}
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
static tr_bool
|
|
tr_isPex( const tr_pex * pex )
|
|
{
|
|
return pex && tr_isAddress( &pex->addr );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrAddPex( tr_torrent * tor,
|
|
uint8_t from,
|
|
const tr_pex * pex )
|
|
{
|
|
if( tr_isPex( pex ) ) /* safeguard against corrupt data */
|
|
{
|
|
Torrent * t = tor->torrentPeers;
|
|
managerLock( t->manager );
|
|
|
|
if( !tr_sessionIsAddressBlocked( t->manager->session, &pex->addr ) )
|
|
if( tr_isValidPeerAddress( &pex->addr, pex->port ) )
|
|
ensureAtomExists( t, &pex->addr, pex->port, pex->flags, from );
|
|
|
|
managerUnlock( t->manager );
|
|
}
|
|
}
|
|
|
|
tr_pex *
|
|
tr_peerMgrCompactToPex( const void * compact,
|
|
size_t compactLen,
|
|
const uint8_t * added_f,
|
|
size_t added_f_len,
|
|
size_t * pexCount )
|
|
{
|
|
size_t i;
|
|
size_t n = compactLen / 6;
|
|
const uint8_t * walk = compact;
|
|
tr_pex * pex = tr_new0( tr_pex, n );
|
|
|
|
for( i = 0; i < n; ++i )
|
|
{
|
|
pex[i].addr.type = TR_AF_INET;
|
|
memcpy( &pex[i].addr.addr, walk, 4 ); walk += 4;
|
|
memcpy( &pex[i].port, walk, 2 ); walk += 2;
|
|
if( added_f && ( n == added_f_len ) )
|
|
pex[i].flags = added_f[i];
|
|
}
|
|
|
|
*pexCount = n;
|
|
return pex;
|
|
}
|
|
|
|
tr_pex *
|
|
tr_peerMgrCompact6ToPex( const void * compact,
|
|
size_t compactLen,
|
|
const uint8_t * added_f,
|
|
size_t added_f_len,
|
|
size_t * pexCount )
|
|
{
|
|
size_t i;
|
|
size_t n = compactLen / 18;
|
|
const uint8_t * walk = compact;
|
|
tr_pex * pex = tr_new0( tr_pex, n );
|
|
|
|
for( i = 0; i < n; ++i )
|
|
{
|
|
pex[i].addr.type = TR_AF_INET6;
|
|
memcpy( &pex[i].addr.addr.addr6.s6_addr, walk, 16 ); walk += 16;
|
|
memcpy( &pex[i].port, walk, 2 ); walk += 2;
|
|
if( added_f && ( n == added_f_len ) )
|
|
pex[i].flags = added_f[i];
|
|
}
|
|
|
|
*pexCount = n;
|
|
return pex;
|
|
}
|
|
|
|
tr_pex *
|
|
tr_peerMgrArrayToPex( const void * array,
|
|
size_t arrayLen,
|
|
size_t * pexCount )
|
|
{
|
|
size_t i;
|
|
size_t n = arrayLen / ( sizeof( tr_address ) + 2 );
|
|
/*size_t n = arrayLen / sizeof( tr_peerArrayElement );*/
|
|
const uint8_t * walk = array;
|
|
tr_pex * pex = tr_new0( tr_pex, n );
|
|
|
|
for( i = 0 ; i < n ; i++ ) {
|
|
memcpy( &pex[i].addr, walk, sizeof( tr_address ) );
|
|
memcpy( &pex[i].port, walk + sizeof( tr_address ), 2 );
|
|
pex[i].flags = 0x00;
|
|
walk += sizeof( tr_address ) + 2;
|
|
}
|
|
|
|
*pexCount = n;
|
|
return pex;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerMgrSetBlame( tr_torrent * tor,
|
|
tr_piece_index_t pieceIndex,
|
|
int success )
|
|
{
|
|
if( !success )
|
|
{
|
|
int peerCount, i;
|
|
Torrent * t = tor->torrentPeers;
|
|
tr_peer ** peers;
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
peers = (tr_peer **) tr_ptrArrayPeek( &t->peers, &peerCount );
|
|
for( i = 0; i < peerCount; ++i )
|
|
{
|
|
tr_peer * peer = peers[i];
|
|
if( tr_bitfieldHas( peer->blame, pieceIndex ) )
|
|
{
|
|
tordbg( t, "peer %s contributed to corrupt piece (%d); now has %d strikes",
|
|
tr_peerIoAddrStr( &peer->addr, peer->port ),
|
|
pieceIndex, (int)peer->strikes + 1 );
|
|
addStrike( t, peer );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
tr_pexCompare( const void * va, const void * vb )
|
|
{
|
|
const tr_pex * a = va;
|
|
const tr_pex * b = vb;
|
|
int i;
|
|
|
|
assert( tr_isPex( a ) );
|
|
assert( tr_isPex( b ) );
|
|
|
|
if(( i = tr_compareAddresses( &a->addr, &b->addr )))
|
|
return i;
|
|
|
|
if( a->port != b->port )
|
|
return a->port < b->port ? -1 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
peerPrefersCrypto( const tr_peer * peer )
|
|
{
|
|
if( peer->encryption_preference == ENCRYPTION_PREFERENCE_YES )
|
|
return TRUE;
|
|
|
|
if( peer->encryption_preference == ENCRYPTION_PREFERENCE_NO )
|
|
return FALSE;
|
|
|
|
return tr_peerIoIsEncrypted( peer->io );
|
|
}
|
|
|
|
int
|
|
tr_peerMgrGetPeers( tr_torrent * tor,
|
|
tr_pex ** setme_pex,
|
|
uint8_t af)
|
|
{
|
|
int peersReturning = 0;
|
|
const Torrent * t = tor->torrentPeers;
|
|
|
|
managerLock( t->manager );
|
|
|
|
{
|
|
int i;
|
|
const tr_peer ** peers = (const tr_peer**) tr_ptrArrayBase( &t->peers );
|
|
const int peerCount = tr_ptrArraySize( &t->peers );
|
|
/* for now, this will waste memory on torrents that have both
|
|
* ipv6 and ipv4 peers */
|
|
tr_pex * pex = tr_new( tr_pex, peerCount );
|
|
tr_pex * walk = pex;
|
|
|
|
for( i=0; i<peerCount; ++i )
|
|
{
|
|
const tr_peer * peer = peers[i];
|
|
if( peer->addr.type == af )
|
|
{
|
|
const struct peer_atom * atom = getExistingAtom( t, &peer->addr );
|
|
|
|
assert( tr_isAddress( &peer->addr ) );
|
|
walk->addr = peer->addr;
|
|
walk->port = peer->port;
|
|
walk->flags = 0;
|
|
if( peerPrefersCrypto( peer ) )
|
|
walk->flags |= ADDED_F_ENCRYPTION_FLAG;
|
|
if( ( atom->uploadOnly == UPLOAD_ONLY_YES ) || ( peer->progress >= 1.0 ) )
|
|
walk->flags |= ADDED_F_SEED_FLAG;
|
|
++peersReturning;
|
|
++walk;
|
|
}
|
|
}
|
|
|
|
assert( ( walk - pex ) == peersReturning );
|
|
qsort( pex, peersReturning, sizeof( tr_pex ), tr_pexCompare );
|
|
*setme_pex = pex;
|
|
}
|
|
|
|
managerUnlock( t->manager );
|
|
return peersReturning;
|
|
}
|
|
|
|
void
|
|
tr_peerMgrStartTorrent( tr_torrent * tor )
|
|
{
|
|
Torrent * t = tor->torrentPeers;
|
|
|
|
managerLock( t->manager );
|
|
|
|
assert( t );
|
|
|
|
if( !t->isRunning )
|
|
{
|
|
t->isRunning = TRUE;
|
|
|
|
if( !tr_ptrArrayEmpty( &t->webseeds ) )
|
|
refillSoon( t );
|
|
}
|
|
|
|
managerUnlock( t->manager );
|
|
}
|
|
|
|
static void
|
|
stopTorrent( Torrent * t )
|
|
{
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
t->isRunning = FALSE;
|
|
|
|
/* disconnect the peers. */
|
|
tr_ptrArrayForeach( &t->peers, (PtrArrayForeachFunc)peerDestructor );
|
|
tr_ptrArrayClear( &t->peers );
|
|
|
|
/* disconnect the handshakes. handshakeAbort calls handshakeDoneCB(),
|
|
* which removes the handshake from t->outgoingHandshakes... */
|
|
while( !tr_ptrArrayEmpty( &t->outgoingHandshakes ) )
|
|
tr_handshakeAbort( tr_ptrArrayNth( &t->outgoingHandshakes, 0 ) );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrStopTorrent( tr_torrent * tor )
|
|
{
|
|
Torrent * t = tor->torrentPeers;
|
|
|
|
managerLock( t->manager );
|
|
|
|
stopTorrent( t );
|
|
|
|
managerUnlock( t->manager );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrAddTorrent( tr_peerMgr * manager,
|
|
tr_torrent * tor )
|
|
{
|
|
managerLock( manager );
|
|
|
|
assert( tor );
|
|
assert( tor->torrentPeers == NULL );
|
|
|
|
tor->torrentPeers = torrentConstructor( manager, tor );
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrRemoveTorrent( tr_torrent * tor )
|
|
{
|
|
tr_torrentLock( tor );
|
|
|
|
stopTorrent( tor->torrentPeers );
|
|
torrentDestructor( tor->torrentPeers );
|
|
|
|
tr_torrentUnlock( tor );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrTorrentAvailability( const tr_torrent * tor,
|
|
int8_t * tab,
|
|
unsigned int tabCount )
|
|
{
|
|
tr_piece_index_t i;
|
|
const Torrent * t;
|
|
float interval;
|
|
tr_bool isSeed;
|
|
int peerCount;
|
|
const tr_peer ** peers;
|
|
tr_torrentLock( tor );
|
|
|
|
t = tor->torrentPeers;
|
|
tor = t->tor;
|
|
interval = tor->info.pieceCount / (float)tabCount;
|
|
isSeed = tor && ( tr_cpGetStatus ( &tor->completion ) == TR_SEED );
|
|
peers = (const tr_peer **) tr_ptrArrayBase( &t->peers );
|
|
peerCount = tr_ptrArraySize( &t->peers );
|
|
|
|
memset( tab, 0, tabCount );
|
|
|
|
for( i = 0; tor && i < tabCount; ++i )
|
|
{
|
|
const int piece = i * interval;
|
|
|
|
if( isSeed || tr_cpPieceIsComplete( &tor->completion, piece ) )
|
|
tab[i] = -1;
|
|
else if( peerCount ) {
|
|
int j;
|
|
for( j = 0; j < peerCount; ++j )
|
|
if( tr_bitfieldHas( peers[j]->have, i ) )
|
|
++tab[i];
|
|
}
|
|
}
|
|
|
|
tr_torrentUnlock( tor );
|
|
}
|
|
|
|
/* Returns the pieces that are available from peers */
|
|
tr_bitfield*
|
|
tr_peerMgrGetAvailable( const tr_torrent * tor )
|
|
{
|
|
int i;
|
|
int peerCount;
|
|
Torrent * t = tor->torrentPeers;
|
|
const tr_peer ** peers;
|
|
tr_bitfield * pieces;
|
|
managerLock( t->manager );
|
|
|
|
pieces = tr_bitfieldNew( t->tor->info.pieceCount );
|
|
peerCount = tr_ptrArraySize( &t->peers );
|
|
peers = (const tr_peer**) tr_ptrArrayBase( &t->peers );
|
|
for( i=0; i<peerCount; ++i )
|
|
tr_bitfieldOr( pieces, peers[i]->have );
|
|
|
|
managerUnlock( t->manager );
|
|
return pieces;
|
|
}
|
|
|
|
void
|
|
tr_peerMgrTorrentStats( tr_torrent * tor,
|
|
int * setmePeersKnown,
|
|
int * setmePeersConnected,
|
|
int * setmeSeedsConnected,
|
|
int * setmeWebseedsSendingToUs,
|
|
int * setmePeersSendingToUs,
|
|
int * setmePeersGettingFromUs,
|
|
int * setmePeersFrom )
|
|
{
|
|
int i, size;
|
|
const Torrent * t = tor->torrentPeers;
|
|
const tr_peer ** peers;
|
|
const tr_webseed ** webseeds;
|
|
|
|
managerLock( t->manager );
|
|
|
|
peers = (const tr_peer **) tr_ptrArrayBase( &t->peers );
|
|
size = tr_ptrArraySize( &t->peers );
|
|
|
|
*setmePeersKnown = tr_ptrArraySize( &t->pool );
|
|
*setmePeersConnected = 0;
|
|
*setmeSeedsConnected = 0;
|
|
*setmePeersGettingFromUs = 0;
|
|
*setmePeersSendingToUs = 0;
|
|
*setmeWebseedsSendingToUs = 0;
|
|
|
|
for( i=0; i<TR_PEER_FROM__MAX; ++i )
|
|
setmePeersFrom[i] = 0;
|
|
|
|
for( i=0; i<size; ++i )
|
|
{
|
|
const tr_peer * peer = peers[i];
|
|
const struct peer_atom * atom = getExistingAtom( t, &peer->addr );
|
|
|
|
if( peer->io == NULL ) /* not connected */
|
|
continue;
|
|
|
|
++*setmePeersConnected;
|
|
|
|
++setmePeersFrom[atom->from];
|
|
|
|
if( clientIsDownloadingFrom( peer ) )
|
|
++*setmePeersSendingToUs;
|
|
|
|
if( clientIsUploadingTo( peer ) )
|
|
++*setmePeersGettingFromUs;
|
|
|
|
if( atom->flags & ADDED_F_SEED_FLAG )
|
|
++*setmeSeedsConnected;
|
|
}
|
|
|
|
webseeds = (const tr_webseed**) tr_ptrArrayBase( &t->webseeds );
|
|
size = tr_ptrArraySize( &t->webseeds );
|
|
for( i=0; i<size; ++i )
|
|
if( tr_webseedIsActive( webseeds[i] ) )
|
|
++*setmeWebseedsSendingToUs;
|
|
|
|
managerUnlock( t->manager );
|
|
}
|
|
|
|
float*
|
|
tr_peerMgrWebSpeeds( const tr_torrent * tor )
|
|
{
|
|
const Torrent * t = tor->torrentPeers;
|
|
const tr_webseed ** webseeds;
|
|
int i;
|
|
int webseedCount;
|
|
float * ret;
|
|
uint64_t now;
|
|
|
|
assert( t->manager );
|
|
managerLock( t->manager );
|
|
|
|
webseeds = (const tr_webseed**) tr_ptrArrayBase( &t->webseeds );
|
|
webseedCount = tr_ptrArraySize( &t->webseeds );
|
|
assert( webseedCount == tor->info.webseedCount );
|
|
ret = tr_new0( float, webseedCount );
|
|
now = tr_date( );
|
|
|
|
for( i=0; i<webseedCount; ++i )
|
|
if( !tr_webseedGetSpeed( webseeds[i], now, &ret[i] ) )
|
|
ret[i] = -1.0;
|
|
|
|
managerUnlock( t->manager );
|
|
return ret;
|
|
}
|
|
|
|
double
|
|
tr_peerGetPieceSpeed( const tr_peer * peer, uint64_t now, tr_direction direction )
|
|
{
|
|
return peer->io ? tr_peerIoGetPieceSpeed( peer->io, now, direction ) : 0.0;
|
|
}
|
|
|
|
|
|
struct tr_peer_stat *
|
|
tr_peerMgrPeerStats( const tr_torrent * tor,
|
|
int * setmeCount )
|
|
{
|
|
int i, size;
|
|
const Torrent * t = tor->torrentPeers;
|
|
const tr_peer ** peers;
|
|
tr_peer_stat * ret;
|
|
uint64_t now;
|
|
|
|
assert( t->manager );
|
|
managerLock( t->manager );
|
|
|
|
size = tr_ptrArraySize( &t->peers );
|
|
peers = (const tr_peer**) tr_ptrArrayBase( &t->peers );
|
|
ret = tr_new0( tr_peer_stat, size );
|
|
now = tr_date( );
|
|
|
|
for( i = 0; i < size; ++i )
|
|
{
|
|
char * pch;
|
|
const tr_peer * peer = peers[i];
|
|
const struct peer_atom * atom = getExistingAtom( t, &peer->addr );
|
|
tr_peer_stat * stat = ret + i;
|
|
|
|
tr_ntop( &peer->addr, stat->addr, sizeof( stat->addr ) );
|
|
tr_strlcpy( stat->client, ( peer->client ? peer->client : "" ),
|
|
sizeof( stat->client ) );
|
|
stat->port = ntohs( peer->port );
|
|
stat->from = atom->from;
|
|
stat->progress = peer->progress;
|
|
stat->isEncrypted = tr_peerIoIsEncrypted( peer->io ) ? 1 : 0;
|
|
stat->rateToPeer = tr_peerGetPieceSpeed( peer, now, TR_CLIENT_TO_PEER );
|
|
stat->rateToClient = tr_peerGetPieceSpeed( peer, now, TR_PEER_TO_CLIENT );
|
|
stat->peerIsChoked = peer->peerIsChoked;
|
|
stat->peerIsInterested = peer->peerIsInterested;
|
|
stat->clientIsChoked = peer->clientIsChoked;
|
|
stat->clientIsInterested = peer->clientIsInterested;
|
|
stat->isIncoming = tr_peerIoIsIncoming( peer->io );
|
|
stat->isDownloadingFrom = clientIsDownloadingFrom( peer );
|
|
stat->isUploadingTo = clientIsUploadingTo( peer );
|
|
stat->isSeed = ( atom->uploadOnly == UPLOAD_ONLY_YES ) || ( peer->progress >= 1.0 );
|
|
|
|
pch = stat->flagStr;
|
|
if( t->optimistic == peer ) *pch++ = 'O';
|
|
if( stat->isDownloadingFrom ) *pch++ = 'D';
|
|
else if( stat->clientIsInterested ) *pch++ = 'd';
|
|
if( stat->isUploadingTo ) *pch++ = 'U';
|
|
else if( stat->peerIsInterested ) *pch++ = 'u';
|
|
if( !stat->clientIsChoked && !stat->clientIsInterested ) *pch++ = 'K';
|
|
if( !stat->peerIsChoked && !stat->peerIsInterested ) *pch++ = '?';
|
|
if( stat->isEncrypted ) *pch++ = 'E';
|
|
if( stat->from == TR_PEER_FROM_PEX ) *pch++ = 'X';
|
|
if( stat->isIncoming ) *pch++ = 'I';
|
|
*pch = '\0';
|
|
}
|
|
|
|
*setmeCount = size;
|
|
|
|
managerUnlock( t->manager );
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
struct ChokeData
|
|
{
|
|
tr_bool doUnchoke;
|
|
tr_bool isInterested;
|
|
tr_bool isChoked;
|
|
int rate;
|
|
tr_peer * peer;
|
|
};
|
|
|
|
static int
|
|
compareChoke( const void * va,
|
|
const void * vb )
|
|
{
|
|
const struct ChokeData * a = va;
|
|
const struct ChokeData * b = vb;
|
|
|
|
if( a->rate != b->rate ) /* prefer higher overall speeds */
|
|
return a->rate > b->rate ? -1 : 1;
|
|
|
|
if( a->isChoked != b->isChoked ) /* prefer unchoked */
|
|
return a->isChoked ? 1 : -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
isNew( const tr_peer * peer )
|
|
{
|
|
return peer && peer->io && tr_peerIoGetAge( peer->io ) < 45;
|
|
}
|
|
|
|
static int
|
|
isSame( const tr_peer * peer )
|
|
{
|
|
return peer && peer->client && strstr( peer->client, "Transmission" );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static void
|
|
rechokeTorrent( Torrent * t )
|
|
{
|
|
int i, size, unchokedInterested;
|
|
const int peerCount = tr_ptrArraySize( &t->peers );
|
|
tr_peer ** peers = (tr_peer**) tr_ptrArrayBase( &t->peers );
|
|
struct ChokeData * choke = tr_new0( struct ChokeData, peerCount );
|
|
const tr_session * session = t->manager->session;
|
|
const int chokeAll = !tr_torrentIsPieceTransferAllowed( t->tor, TR_CLIENT_TO_PEER );
|
|
const uint64_t now = tr_date( );
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
/* sort the peers by preference and rate */
|
|
for( i = 0, size = 0; i < peerCount; ++i )
|
|
{
|
|
tr_peer * peer = peers[i];
|
|
struct peer_atom * atom = getExistingAtom( t, &peer->addr );
|
|
|
|
if( peer->progress >= 1.0 ) /* choke all seeds */
|
|
{
|
|
tr_peerMsgsSetChoke( peer->msgs, TRUE );
|
|
}
|
|
else if( atom->uploadOnly == UPLOAD_ONLY_YES ) /* choke partial seeds */
|
|
{
|
|
tr_peerMsgsSetChoke( peer->msgs, TRUE );
|
|
}
|
|
else if( chokeAll ) /* choke everyone if we're not uploading */
|
|
{
|
|
tr_peerMsgsSetChoke( peer->msgs, TRUE );
|
|
}
|
|
else
|
|
{
|
|
struct ChokeData * n = &choke[size++];
|
|
n->peer = peer;
|
|
n->isInterested = peer->peerIsInterested;
|
|
n->isChoked = peer->peerIsChoked;
|
|
n->rate = tr_peerGetPieceSpeed( peer, now, TR_CLIENT_TO_PEER ) * 1024;
|
|
}
|
|
}
|
|
|
|
qsort( choke, size, sizeof( struct ChokeData ), compareChoke );
|
|
|
|
/**
|
|
* Reciprocation and number of uploads capping is managed by unchoking
|
|
* the N peers which have the best upload rate and are interested.
|
|
* This maximizes the client's download rate. These N peers are
|
|
* referred to as downloaders, because they are interested in downloading
|
|
* from the client.
|
|
*
|
|
* Peers which have a better upload rate (as compared to the downloaders)
|
|
* but aren't interested get unchoked. If they become interested, the
|
|
* downloader with the worst upload rate gets choked. If a client has
|
|
* a complete file, it uses its upload rate rather than its download
|
|
* rate to decide which peers to unchoke.
|
|
*/
|
|
unchokedInterested = 0;
|
|
for( i=0; i<size && unchokedInterested<session->uploadSlotsPerTorrent; ++i ) {
|
|
choke[i].doUnchoke = 1;
|
|
if( choke[i].isInterested )
|
|
++unchokedInterested;
|
|
}
|
|
|
|
/* optimistic unchoke */
|
|
if( i < size )
|
|
{
|
|
int n;
|
|
struct ChokeData * c;
|
|
tr_ptrArray randPool = TR_PTR_ARRAY_INIT;
|
|
|
|
for( ; i<size; ++i )
|
|
{
|
|
if( choke[i].isInterested )
|
|
{
|
|
const tr_peer * peer = choke[i].peer;
|
|
int x = 1, y;
|
|
if( isNew( peer ) ) x *= 3;
|
|
if( isSame( peer ) ) x *= 3;
|
|
for( y=0; y<x; ++y )
|
|
tr_ptrArrayAppend( &randPool, &choke[i] );
|
|
}
|
|
}
|
|
|
|
if(( n = tr_ptrArraySize( &randPool )))
|
|
{
|
|
c = tr_ptrArrayNth( &randPool, tr_cryptoWeakRandInt( n ));
|
|
c->doUnchoke = 1;
|
|
t->optimistic = c->peer;
|
|
}
|
|
|
|
tr_ptrArrayDestruct( &randPool, NULL );
|
|
}
|
|
|
|
for( i=0; i<size; ++i )
|
|
tr_peerMsgsSetChoke( choke[i].peer->msgs, !choke[i].doUnchoke );
|
|
|
|
/* cleanup */
|
|
tr_free( choke );
|
|
}
|
|
|
|
static int
|
|
rechokePulse( void * vmgr )
|
|
{
|
|
tr_torrent * tor = NULL;
|
|
tr_peerMgr * mgr = vmgr;
|
|
managerLock( mgr );
|
|
|
|
while(( tor = tr_torrentNext( mgr->session, tor )))
|
|
if( tor->isRunning )
|
|
rechokeTorrent( tor->torrentPeers );
|
|
|
|
managerUnlock( mgr );
|
|
return TRUE;
|
|
}
|
|
|
|
/***
|
|
****
|
|
**** Life and Death
|
|
****
|
|
***/
|
|
|
|
typedef enum
|
|
{
|
|
TR_CAN_KEEP,
|
|
TR_CAN_CLOSE,
|
|
TR_MUST_CLOSE,
|
|
}
|
|
tr_close_type_t;
|
|
|
|
static tr_close_type_t
|
|
shouldPeerBeClosed( const Torrent * t,
|
|
const tr_peer * peer,
|
|
int peerCount )
|
|
{
|
|
const tr_torrent * tor = t->tor;
|
|
const time_t now = time( NULL );
|
|
const struct peer_atom * atom = getExistingAtom( t, &peer->addr );
|
|
|
|
/* if it's marked for purging, close it */
|
|
if( peer->doPurge )
|
|
{
|
|
tordbg( t, "purging peer %s because its doPurge flag is set",
|
|
tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
return TR_MUST_CLOSE;
|
|
}
|
|
|
|
/* if we're seeding and the peer has everything we have,
|
|
* and enough time has passed for a pex exchange, then disconnect */
|
|
if( tr_torrentIsSeed( tor ) )
|
|
{
|
|
int peerHasEverything;
|
|
if( atom->flags & ADDED_F_SEED_FLAG )
|
|
peerHasEverything = TRUE;
|
|
else if( peer->progress < tr_cpPercentDone( &tor->completion ) )
|
|
peerHasEverything = FALSE;
|
|
else {
|
|
tr_bitfield * tmp = tr_bitfieldDup( tr_cpPieceBitfield( &tor->completion ) );
|
|
tr_bitfieldDifference( tmp, peer->have );
|
|
peerHasEverything = tr_bitfieldCountTrueBits( tmp ) == 0;
|
|
tr_bitfieldFree( tmp );
|
|
}
|
|
|
|
if( peerHasEverything && ( !tr_torrentAllowsPex(tor) || (now-atom->time>=30 )))
|
|
{
|
|
tordbg( t, "purging peer %s because we're both seeds",
|
|
tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
return TR_MUST_CLOSE;
|
|
}
|
|
}
|
|
|
|
/* disconnect if it's been too long since piece data has been transferred.
|
|
* this is on a sliding scale based on number of available peers... */
|
|
{
|
|
const int relaxStrictnessIfFewerThanN = (int)( ( getMaxPeerCount( tor ) * 0.9 ) + 0.5 );
|
|
/* if we have >= relaxIfFewerThan, strictness is 100%.
|
|
* if we have zero connections, strictness is 0% */
|
|
const float strictness = peerCount >= relaxStrictnessIfFewerThanN
|
|
? 1.0
|
|
: peerCount / (float)relaxStrictnessIfFewerThanN;
|
|
const int lo = MIN_UPLOAD_IDLE_SECS;
|
|
const int hi = MAX_UPLOAD_IDLE_SECS;
|
|
const int limit = hi - ( ( hi - lo ) * strictness );
|
|
const int idleTime = now - MAX( atom->time, atom->piece_data_time );
|
|
/*fprintf( stderr, "strictness is %.3f, limit is %d seconds... time since connect is %d, time since piece is %d ... idleTime is %d, doPurge is %d\n", (double)strictness, limit, (int)(now - atom->time), (int)(now - atom->piece_data_time), idleTime, idleTime > limit );*/
|
|
if( idleTime > limit ) {
|
|
tordbg( t, "purging peer %s because it's been %d secs since we shared anything",
|
|
tr_peerIoAddrStr( &atom->addr, atom->port ), idleTime );
|
|
return TR_CAN_CLOSE;
|
|
}
|
|
}
|
|
|
|
return TR_CAN_KEEP;
|
|
}
|
|
|
|
static tr_peer **
|
|
getPeersToClose( Torrent * t, tr_close_type_t closeType, int * setmeSize )
|
|
{
|
|
int i, peerCount, outsize;
|
|
tr_peer ** peers = (tr_peer**) tr_ptrArrayPeek( &t->peers, &peerCount );
|
|
struct tr_peer ** ret = tr_new( tr_peer *, peerCount );
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
for( i = outsize = 0; i < peerCount; ++i )
|
|
if( shouldPeerBeClosed( t, peers[i], peerCount ) == closeType )
|
|
ret[outsize++] = peers[i];
|
|
|
|
*setmeSize = outsize;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
compareCandidates( const void * va,
|
|
const void * vb )
|
|
{
|
|
const struct peer_atom * a = *(const struct peer_atom**) va;
|
|
const struct peer_atom * b = *(const struct peer_atom**) vb;
|
|
|
|
/* <Charles> Here we would probably want to try reconnecting to
|
|
* peers that had most recently given us data. Lots of users have
|
|
* trouble with resets due to their routers and/or ISPs. This way we
|
|
* can quickly recover from an unwanted reset. So we sort
|
|
* piece_data_time in descending order.
|
|
*/
|
|
|
|
if( a->piece_data_time != b->piece_data_time )
|
|
return a->piece_data_time < b->piece_data_time ? 1 : -1;
|
|
|
|
if( a->numFails != b->numFails )
|
|
return a->numFails < b->numFails ? -1 : 1;
|
|
|
|
if( a->time != b->time )
|
|
return a->time < b->time ? -1 : 1;
|
|
|
|
/* all other things being equal, prefer peers whose
|
|
* information comes from a more reliable source */
|
|
if( a->from != b->from )
|
|
return a->from < b->from ? -1 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
getReconnectIntervalSecs( const struct peer_atom * atom )
|
|
{
|
|
int sec;
|
|
const time_t now = time( NULL );
|
|
|
|
/* if we were recently connected to this peer and transferring piece
|
|
* data, try to reconnect to them sooner rather that later -- we don't
|
|
* want network troubles to get in the way of a good peer. */
|
|
if( ( now - atom->piece_data_time ) <= ( MINIMUM_RECONNECT_INTERVAL_SECS * 2 ) )
|
|
sec = MINIMUM_RECONNECT_INTERVAL_SECS;
|
|
|
|
/* don't allow reconnects more often than our minimum */
|
|
else if( ( now - atom->time ) < MINIMUM_RECONNECT_INTERVAL_SECS )
|
|
sec = MINIMUM_RECONNECT_INTERVAL_SECS;
|
|
|
|
/* otherwise, the interval depends on how many times we've tried
|
|
* and failed to connect to the peer */
|
|
else switch( atom->numFails ) {
|
|
case 0: sec = 0; break;
|
|
case 1: sec = 5; break;
|
|
case 2: sec = 2 * 60; break;
|
|
case 3: sec = 15 * 60; break;
|
|
case 4: sec = 30 * 60; break;
|
|
case 5: sec = 60 * 60; break;
|
|
default: sec = 120 * 60; break;
|
|
}
|
|
|
|
return sec;
|
|
}
|
|
|
|
static struct peer_atom **
|
|
getPeerCandidates( Torrent * t, int * setmeSize )
|
|
{
|
|
int i, atomCount, retCount;
|
|
struct peer_atom ** atoms;
|
|
struct peer_atom ** ret;
|
|
const time_t now = time( NULL );
|
|
const int seed = tr_torrentIsSeed( t->tor );
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
atoms = (struct peer_atom**) tr_ptrArrayPeek( &t->pool, &atomCount );
|
|
ret = tr_new( struct peer_atom*, atomCount );
|
|
for( i = retCount = 0; i < atomCount; ++i )
|
|
{
|
|
int interval;
|
|
struct peer_atom * atom = atoms[i];
|
|
|
|
/* peer fed us too much bad data ... we only keep it around
|
|
* now to weed it out in case someone sends it to us via pex */
|
|
if( atom->myflags & MYFLAG_BANNED )
|
|
continue;
|
|
|
|
/* peer was unconnectable before, so we're not going to keep trying.
|
|
* this is needs a separate flag from `banned', since if they try
|
|
* to connect to us later, we'll let them in */
|
|
if( atom->myflags & MYFLAG_UNREACHABLE )
|
|
continue;
|
|
|
|
/* we don't need two connections to the same peer... */
|
|
if( peerIsInUse( t, &atom->addr ) )
|
|
continue;
|
|
|
|
/* no need to connect if we're both seeds... */
|
|
if( seed && ( ( atom->flags & ADDED_F_SEED_FLAG ) ||
|
|
( atom->uploadOnly == UPLOAD_ONLY_YES ) ) )
|
|
continue;
|
|
|
|
/* don't reconnect too often */
|
|
interval = getReconnectIntervalSecs( atom );
|
|
if( ( now - atom->time ) < interval )
|
|
{
|
|
tordbg( t, "RECONNECT peer %d (%s) is in its grace period of %d seconds..",
|
|
i, tr_peerIoAddrStr( &atom->addr, atom->port ), interval );
|
|
continue;
|
|
}
|
|
|
|
/* Don't connect to peers in our blocklist */
|
|
if( tr_sessionIsAddressBlocked( t->manager->session, &atom->addr ) )
|
|
continue;
|
|
|
|
ret[retCount++] = atom;
|
|
}
|
|
|
|
qsort( ret, retCount, sizeof( struct peer_atom* ), compareCandidates );
|
|
*setmeSize = retCount;
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
closePeer( Torrent * t, tr_peer * peer )
|
|
{
|
|
struct peer_atom * atom;
|
|
|
|
assert( t != NULL );
|
|
assert( peer != NULL );
|
|
|
|
/* if we transferred piece data, then they might be good peers,
|
|
so reset their `numFails' weight to zero. otherwise we connected
|
|
to them fruitlessly, so mark it as another fail */
|
|
atom = getExistingAtom( t, &peer->addr );
|
|
if( atom->piece_data_time )
|
|
atom->numFails = 0;
|
|
else
|
|
++atom->numFails;
|
|
|
|
tordbg( t, "removing bad peer %s", tr_peerIoGetAddrStr( peer->io ) );
|
|
removePeer( t, peer );
|
|
}
|
|
|
|
static void
|
|
reconnectTorrent( Torrent * t )
|
|
{
|
|
static time_t prevTime = 0;
|
|
static int newConnectionsThisSecond = 0;
|
|
time_t now;
|
|
|
|
now = time( NULL );
|
|
if( prevTime != now )
|
|
{
|
|
prevTime = now;
|
|
newConnectionsThisSecond = 0;
|
|
}
|
|
|
|
if( !t->isRunning )
|
|
{
|
|
removeAllPeers( t );
|
|
}
|
|
else
|
|
{
|
|
int i;
|
|
int canCloseCount;
|
|
int mustCloseCount;
|
|
int candidateCount;
|
|
int maxCandidates;
|
|
struct tr_peer ** canClose = getPeersToClose( t, TR_CAN_CLOSE, &canCloseCount );
|
|
struct tr_peer ** mustClose = getPeersToClose( t, TR_MUST_CLOSE, &mustCloseCount );
|
|
struct peer_atom ** candidates = getPeerCandidates( t, &candidateCount );
|
|
|
|
tordbg( t, "reconnect pulse for [%s]: "
|
|
"%d must-close connections, "
|
|
"%d can-close connections, "
|
|
"%d connection candidates, "
|
|
"%d atoms, "
|
|
"max per pulse is %d",
|
|
t->tor->info.name,
|
|
mustCloseCount,
|
|
canCloseCount,
|
|
candidateCount,
|
|
tr_ptrArraySize( &t->pool ),
|
|
MAX_RECONNECTIONS_PER_PULSE );
|
|
|
|
/* disconnect the really bad peers */
|
|
for( i=0; i<mustCloseCount; ++i )
|
|
closePeer( t, mustClose[i] );
|
|
|
|
/* decide how many peers can we try to add in this pass */
|
|
maxCandidates = candidateCount;
|
|
maxCandidates = MIN( maxCandidates, MAX_RECONNECTIONS_PER_PULSE );
|
|
maxCandidates = MIN( maxCandidates, getMaxPeerCount( t->tor ) - getPeerCount( t ) );
|
|
maxCandidates = MIN( maxCandidates, MAX_CONNECTIONS_PER_SECOND - newConnectionsThisSecond );
|
|
|
|
/* maybe disconnect some lesser peers, if we have candidates to replace them with */
|
|
for( i=0; ( i<canCloseCount ) && ( i<maxCandidates ); ++i )
|
|
closePeer( t, canClose[i] );
|
|
|
|
tordbg( t, "candidateCount is %d, MAX_RECONNECTIONS_PER_PULSE is %d,"
|
|
" getPeerCount(t) is %d, getMaxPeerCount(t) is %d, "
|
|
"newConnectionsThisSecond is %d, MAX_CONNECTIONS_PER_SECOND is %d",
|
|
candidateCount,
|
|
MAX_RECONNECTIONS_PER_PULSE,
|
|
getPeerCount( t ),
|
|
getMaxPeerCount( t->tor ),
|
|
newConnectionsThisSecond, MAX_CONNECTIONS_PER_SECOND );
|
|
|
|
/* add some new ones */
|
|
for( i=0; i<maxCandidates; ++i )
|
|
{
|
|
tr_peerMgr * mgr = t->manager;
|
|
struct peer_atom * atom = candidates[i];
|
|
tr_peerIo * io;
|
|
|
|
tordbg( t, "Starting an OUTGOING connection with %s",
|
|
tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
|
|
io = tr_peerIoNewOutgoing( mgr->session, mgr->session->bandwidth, &atom->addr, atom->port, t->hash );
|
|
|
|
if( io == NULL )
|
|
{
|
|
tordbg( t, "peerIo not created; marking peer %s as unreachable",
|
|
tr_peerIoAddrStr( &atom->addr, atom->port ) );
|
|
atom->myflags |= MYFLAG_UNREACHABLE;
|
|
}
|
|
else
|
|
{
|
|
tr_handshake * handshake = tr_handshakeNew( io,
|
|
mgr->session->encryptionMode,
|
|
myHandshakeDoneCB,
|
|
mgr );
|
|
|
|
assert( tr_peerIoGetTorrentHash( io ) );
|
|
|
|
tr_peerIoUnref( io ); /* balanced by the implicit ref in tr_peerIoNewOutgoing() */
|
|
|
|
++newConnectionsThisSecond;
|
|
|
|
tr_ptrArrayInsertSorted( &t->outgoingHandshakes, handshake,
|
|
handshakeCompare );
|
|
}
|
|
|
|
atom->time = time( NULL );
|
|
}
|
|
|
|
/* cleanup */
|
|
tr_free( candidates );
|
|
tr_free( mustClose );
|
|
tr_free( canClose );
|
|
}
|
|
}
|
|
|
|
static int
|
|
reconnectPulse( void * vmgr )
|
|
{
|
|
tr_torrent * tor = NULL;
|
|
tr_peerMgr * mgr = vmgr;
|
|
managerLock( mgr );
|
|
|
|
while(( tor = tr_torrentNext( mgr->session, tor )))
|
|
if( tor->isRunning )
|
|
reconnectTorrent( tor->torrentPeers );
|
|
|
|
managerUnlock( mgr );
|
|
return TRUE;
|
|
}
|
|
|
|
/****
|
|
*****
|
|
***** BANDWIDTH ALLOCATION
|
|
*****
|
|
****/
|
|
|
|
static void
|
|
pumpAllPeers( tr_peerMgr * mgr )
|
|
{
|
|
tr_torrent * tor = NULL;
|
|
|
|
while(( tor = tr_torrentNext( mgr->session, tor )))
|
|
{
|
|
int j;
|
|
Torrent * t = tor->torrentPeers;
|
|
|
|
for( j=0; j<tr_ptrArraySize( &t->peers ); ++j )
|
|
{
|
|
tr_peer * peer = tr_ptrArrayNth( &t->peers, j );
|
|
tr_peerMsgsPulse( peer->msgs );
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
bandwidthPulse( void * vmgr )
|
|
{
|
|
tr_peerMgr * mgr = vmgr;
|
|
managerLock( mgr );
|
|
|
|
/* FIXME: this next line probably isn't necessary... */
|
|
pumpAllPeers( mgr );
|
|
|
|
/* allocate bandwidth to the peers */
|
|
tr_bandwidthAllocate( mgr->session->bandwidth, TR_UP, BANDWIDTH_PERIOD_MSEC );
|
|
tr_bandwidthAllocate( mgr->session->bandwidth, TR_DOWN, BANDWIDTH_PERIOD_MSEC );
|
|
|
|
managerUnlock( mgr );
|
|
return TRUE;
|
|
}
|