mirror of
https://github.com/transmission/transmission
synced 2024-12-30 19:46:56 +00:00
2579 lines
73 KiB
C
2579 lines
73 KiB
C
/*
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* This file Copyright (C) 2007-2008 Charles Kerr <charles@rebelbase.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 "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 "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-mgr-private.h"
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#include "peer-msgs.h"
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#include "ptrarray.h"
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#include "stats.h" /* 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 = 333,
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/* when many peers are available, keep idle ones this long */
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MIN_UPLOAD_IDLE_SECS = ( 60 * 3 ),
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/* when few peers are available, keep idle ones this long */
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MAX_UPLOAD_IDLE_SECS = ( 60 * 10 ),
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/* how frequently to decide which peers live and die */
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RECONNECT_PERIOD_MSEC = ( 2 * 1000 ),
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/* max # of peers to ask fer per torrent per reconnect pulse */
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MAX_RECONNECTIONS_PER_PULSE = 2,
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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 = 4,
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/* number of unchoked peers per torrent.
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* FIXME: this probably ought to be configurable */
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MAX_UNCHOKED_PEERS = 12,
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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 = 3,
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/* use for bitwise operations w/peer_atom.myflags */
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MYFLAG_BANNED = 1,
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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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/* We keep one of these for every peer we know about, whether
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* it's connected or not, so the struct must be small.
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* When our current connections underperform, we dip back
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* into this list for new ones. */
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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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uint16_t port;
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uint16_t numFails;
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struct in_addr 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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typedef struct
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{
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unsigned int isRunning : 1;
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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 * reconnectTimer;
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tr_timer * rechokeTimer;
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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_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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uint8_t bandwidthPulseNumber;
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tr_session * session;
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tr_ptrArray * torrents; /* Torrent */
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tr_ptrArray * incomingHandshakes; /* tr_handshake */
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tr_timer * bandwidthTimer;
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double rateHistory[2][BANDWIDTH_PULSE_HISTORY];
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double globalPoolHistory[2][BANDWIDTH_PULSE_HISTORY];
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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 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 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 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 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 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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compareAddresses( const struct in_addr * a,
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const struct in_addr * b )
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{
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if( a->s_addr != b->s_addr )
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return a->s_addr < b->s_addr ? -1 : 1;
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return 0;
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}
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static int
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handshakeCompareToAddr( const void * va,
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const void * vb )
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{
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const tr_handshake * a = va;
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return compareAddresses( tr_handshakeGetAddr( a, NULL ), vb );
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}
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static int
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handshakeCompare( const void * a,
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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 struct in_addr * in_addr )
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{
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return tr_ptrArrayFindSorted( handshakes,
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in_addr,
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handshakeCompareToAddr );
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}
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static int
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comparePeerAtomToAddress( const void * va,
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const void * vb )
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{
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const struct peer_atom * a = va;
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return compareAddresses( &a->addr, vb );
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}
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static int
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comparePeerAtoms( const void * va,
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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 int
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torrentCompare( const void * va,
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const void * vb )
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{
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const Torrent * a = va;
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const Torrent * b = vb;
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return memcmp( a->hash, b->hash, SHA_DIGEST_LENGTH );
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}
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static int
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torrentCompareToHash( const void * va,
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const void * vb )
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{
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const Torrent * a = va;
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const uint8_t * b_hash = vb;
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return memcmp( a->hash, b_hash, SHA_DIGEST_LENGTH );
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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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return (Torrent*) tr_ptrArrayFindSorted( manager->torrents,
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hash,
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torrentCompareToHash );
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}
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static int
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peerCompare( const void * va,
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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 compareAddresses( &a->in_addr, &b->in_addr );
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}
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static int
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peerCompareToAddr( const void * va,
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const void * vb )
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{
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const tr_peer * a = va;
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return compareAddresses( &a->in_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 struct in_addr * in_addr )
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{
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assert( torrentIsLocked( torrent ) );
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assert( in_addr );
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return tr_ptrArrayFindSorted( torrent->peers,
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in_addr,
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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 struct in_addr * addr )
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{
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assert( torrentIsLocked( t ) );
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return tr_ptrArrayFindSorted( t->pool, addr, comparePeerAtomToAddress );
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}
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static int
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peerIsInUse( const Torrent * ct,
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const struct in_addr * 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 struct in_addr * in_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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memcpy( &p->in_addr, in_addr, sizeof( struct in_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 struct in_addr * in_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, in_addr );
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if( peer == NULL )
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{
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peer = peerConstructor( in_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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assert( peer->msgs );
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tr_peerMsgsUnsubscribe( peer->msgs, peer->msgsTag );
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tr_peerMsgsFree( peer->msgs );
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tr_peerIoFree( peer->io );
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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->in_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
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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( t->peers );
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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->reconnectTimer );
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tr_timerFree( &t->rechokeTimer );
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tr_timerFree( &t->refillTimer );
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tr_ptrArrayFree( t->webseeds, (PtrArrayForeachFunc)tr_webseedFree );
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tr_ptrArrayFree( t->pool, (PtrArrayForeachFunc)tr_free );
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tr_ptrArrayFree( t->outgoingHandshakes, NULL );
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tr_ptrArrayFree( 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_ptrArrayNew( );
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t->peers = tr_ptrArrayNew( );
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t->webseeds = tr_ptrArrayNew( );
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t->outgoingHandshakes = tr_ptrArrayNew( );
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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,
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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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/**
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* For explanation, see http://www.bittorrent.org/fast_extensions.html
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* Also see the "test-allowed-set" unit test
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*
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* @param k number of pieces in set
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* @param sz number of pieces in the torrent
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* @param infohash torrent's SHA1 hash
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* @param ip peer's address
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*/
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struct tr_bitfield *
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tr_peerMgrGenerateAllowedSet(
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const uint32_t k,
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const uint32_t sz,
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const uint8_t *
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infohash,
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const struct in_addr * ip )
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{
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uint8_t w[SHA_DIGEST_LENGTH + 4];
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uint8_t x[SHA_DIGEST_LENGTH];
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tr_bitfield * a;
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uint32_t a_size;
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*(uint32_t*)w = ntohl( htonl( ip->s_addr ) & 0xffffff00 ); /* (1) */
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memcpy( w + 4, infohash, SHA_DIGEST_LENGTH ); /* (2) */
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tr_sha1( x, w, sizeof( w ), NULL ); /* (3) */
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a = tr_bitfieldNew( sz );
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a_size = 0;
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while( a_size < k )
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{
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int i;
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for( i = 0; i < 5 && a_size < k; ++i ) /* (4) */
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{
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uint32_t j = i * 4; /* (5) */
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uint32_t y = ntohl( *( uint32_t* )( x + j ) ); /* (6) */
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uint32_t index = y % sz; /* (7) */
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if( !tr_bitfieldHas( a, index ) ) /* (8) */
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{
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tr_bitfieldAdd( a, index ); /* (9) */
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++a_size;
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}
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}
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tr_sha1( x, x, sizeof( x ), NULL ); /* (3) */
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}
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return a;
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}
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static int bandwidthPulse( 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->torrents = tr_ptrArrayNew( );
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m->incomingHandshakes = tr_ptrArrayNew( );
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m->bandwidthPulseNumber = -1;
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m->bandwidthTimer = tr_timerNew( session, bandwidthPulse,
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m, 1000 / BANDWIDTH_PULSES_PER_SECOND );
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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->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_ptrArrayFree( manager->incomingHandshakes, NULL );
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/* free the torrents. */
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tr_ptrArrayFree( manager->torrents, torrentDestructor );
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managerUnlock( manager );
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tr_free( manager );
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}
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static tr_peer**
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getConnectedPeers( Torrent * t,
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int * setmeCount )
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{
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int i, peerCount, connectionCount;
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tr_peer **peers;
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tr_peer **ret;
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assert( torrentIsLocked( t ) );
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peers = (tr_peer **) tr_ptrArrayPeek( t->peers, &peerCount );
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ret = tr_new( tr_peer *, peerCount );
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for( i = connectionCount = 0; i < peerCount; ++i )
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if( peers[i]->msgs )
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ret[connectionCount++] = peers[i];
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*setmeCount = connectionCount;
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return ret;
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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;
|
|
}
|
|
|
|
static int
|
|
clientIsUploadingTo( const tr_peer * peer )
|
|
{
|
|
return peer->peerIsInterested && !peer->peerIsChoked;
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
int
|
|
tr_peerMgrPeerIsSeed( const tr_peerMgr * mgr,
|
|
const uint8_t * torrentHash,
|
|
const struct in_addr * addr )
|
|
{
|
|
int isSeed = FALSE;
|
|
const Torrent * t = NULL;
|
|
const struct peer_atom * atom = NULL;
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)mgr, torrentHash );
|
|
if( t )
|
|
atom = getExistingAtom( t, addr );
|
|
if( atom )
|
|
isSeed = ( atom->flags & ADDED_F_SEED_FLAG ) != 0;
|
|
|
|
return isSeed;
|
|
}
|
|
|
|
/****
|
|
*****
|
|
***** REFILL
|
|
*****
|
|
****/
|
|
|
|
static void
|
|
assertValidPiece( Torrent * t, tr_piece_index_t piece )
|
|
{
|
|
assert( t );
|
|
assert( t->tor );
|
|
assert( piece < t->tor->info.pieceCount );
|
|
}
|
|
|
|
static int
|
|
getPieceRequests( Torrent * t, tr_piece_index_t piece )
|
|
{
|
|
assertValidPiece( t, piece );
|
|
|
|
return t->pendingRequestCount ? t->pendingRequestCount[piece] : 0;
|
|
}
|
|
|
|
static void
|
|
incrementPieceRequests( Torrent * t, tr_piece_index_t piece )
|
|
{
|
|
assertValidPiece( t, piece );
|
|
|
|
if( t->pendingRequestCount == NULL )
|
|
t->pendingRequestCount = tr_new0( int, t->tor->info.pieceCount );
|
|
t->pendingRequestCount[piece]++;
|
|
}
|
|
|
|
static void
|
|
decrementPieceRequests( Torrent * t, tr_piece_index_t piece )
|
|
{
|
|
assertValidPiece( t, piece );
|
|
|
|
if( t->pendingRequestCount )
|
|
t->pendingRequestCount[piece]--;
|
|
}
|
|
|
|
struct tr_refill_piece
|
|
{
|
|
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;
|
|
tr_peer** peers;
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
peers = getConnectedPeers( t, &peerCount );
|
|
|
|
/* 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 );
|
|
}
|
|
|
|
tr_free( peers );
|
|
|
|
*pieceCount = poolSize;
|
|
return pool;
|
|
}
|
|
|
|
struct tr_blockIterator
|
|
{
|
|
Torrent * t;
|
|
tr_block_index_t blockIndex, blockCount, *blocks;
|
|
tr_piece_index_t pieceIndex, pieceCount, *pieces;
|
|
};
|
|
|
|
static struct tr_blockIterator*
|
|
blockIteratorNew( Torrent * t )
|
|
{
|
|
struct tr_blockIterator * i = tr_new0( struct tr_blockIterator, 1 );
|
|
i->t = t;
|
|
i->pieces = getPreferredPieces( t, &i->pieceCount );
|
|
i->blocks = tr_new0( tr_block_index_t, t->tor->blockCount );
|
|
return i;
|
|
}
|
|
|
|
static int
|
|
blockIteratorNext( struct tr_blockIterator * i, tr_block_index_t * setme )
|
|
{
|
|
int 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;
|
|
}
|
|
|
|
if(( found = ( i->blockIndex < i->blockCount )))
|
|
*setme = i->blocks[i->blockIndex++];
|
|
|
|
return found;
|
|
}
|
|
|
|
static void
|
|
blockIteratorFree( struct tr_blockIterator * i )
|
|
{
|
|
tr_free( i->blocks );
|
|
tr_free( i->pieces );
|
|
tr_free( i );
|
|
}
|
|
|
|
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
|
|
refillPulse( void * vtorrent )
|
|
{
|
|
tr_block_index_t block;
|
|
int peerCount;
|
|
int webseedCount;
|
|
tr_peer ** peers;
|
|
tr_webseed ** webseeds;
|
|
struct tr_blockIterator * blockIterator;
|
|
Torrent * t = vtorrent;
|
|
tr_torrent * tor = t->tor;
|
|
|
|
if( !t->isRunning )
|
|
return TRUE;
|
|
if( tr_torrentIsSeed( t->tor ) )
|
|
return TRUE;
|
|
|
|
torrentLock( t );
|
|
tordbg( t, "Refilling Request Buffers..." );
|
|
|
|
blockIterator = 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 )
|
|
&& blockIteratorNext( blockIterator, &block ) )
|
|
{
|
|
int j;
|
|
int 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 );
|
|
|
|
/* find a peer who can ask for this block */
|
|
for( j=0; !handled && j<peerCount; )
|
|
{
|
|
const int 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* cleanup */
|
|
blockIteratorFree( blockIterator );
|
|
tr_free( webseeds );
|
|
tr_free( peers );
|
|
|
|
t->refillTimer = NULL;
|
|
torrentUnlock( t );
|
|
return FALSE;
|
|
}
|
|
|
|
static void
|
|
broadcastGotBlock( Torrent * t, uint32_t index, uint32_t offset, uint32_t length )
|
|
{
|
|
int i, size;
|
|
tr_peer ** peers;
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
peers = getConnectedPeers( t, &size );
|
|
for( i=0; i<size; ++i )
|
|
tr_peerMsgsCancel( peers[i]->msgs, index, offset, length );
|
|
tr_free( peers );
|
|
}
|
|
|
|
static void
|
|
addStrike( Torrent * t,
|
|
tr_peer * peer )
|
|
{
|
|
tordbg( t, "increasing peer %s strike count to %d",
|
|
tr_peerIoAddrStr( &peer->in_addr,
|
|
peer->port ), peer->strikes + 1 );
|
|
|
|
if( ++peer->strikes >= MAX_BAD_PIECES_PER_PEER )
|
|
{
|
|
struct peer_atom * atom = getExistingAtom( t, &peer->in_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
|
|
peerCallbackFunc( void * vpeer,
|
|
void * vevent,
|
|
void * vt )
|
|
{
|
|
tr_peer * peer = vpeer; /* may be NULL if peer is a webseed */
|
|
Torrent * t = (Torrent *) vt;
|
|
const tr_peer_event * e = vevent;
|
|
|
|
torrentLock( t );
|
|
|
|
switch( e->eventType )
|
|
{
|
|
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;
|
|
tor->uploadedCur += e->length;
|
|
tr_statsAddUploaded( tor->session, e->length );
|
|
if( peer )
|
|
{
|
|
struct peer_atom * a = getExistingAtom( t, &peer->in_addr );
|
|
a->piece_data_time = now;
|
|
}
|
|
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 )
|
|
tor->downloadedCur += e->length;
|
|
tr_statsAddDownloaded( tor->session, e->length );
|
|
if( peer ) {
|
|
struct peer_atom * a = getExistingAtom( t, &peer->in_addr );
|
|
a->piece_data_time = now;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case TR_PEER_PEER_PROGRESS:
|
|
{
|
|
if( peer )
|
|
{
|
|
struct peer_atom * atom = getExistingAtom( t,
|
|
&peer->in_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 int ok = tr_ioTestPiece( tor, p );
|
|
|
|
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->session->peerMgr, tor->info.hash, p, ok );
|
|
|
|
if( !ok )
|
|
gotBadPiece( t, p );
|
|
else
|
|
{
|
|
int i, peerCount;
|
|
tr_peer ** peers = getConnectedPeers( t, &peerCount );
|
|
for( i = 0; i < peerCount; ++i )
|
|
tr_peerMsgsHave( peers[i]->msgs, p );
|
|
tr_free( peers );
|
|
}
|
|
|
|
tr_torrentRecheckCompleteness( tor );
|
|
}
|
|
break;
|
|
}
|
|
|
|
case TR_PEER_ERROR:
|
|
if( e->err == EINVAL )
|
|
{
|
|
addStrike( t, peer );
|
|
peer->doPurge = 1;
|
|
}
|
|
else if( ( e->err == ERANGE )
|
|
|| ( e->err == EMSGSIZE )
|
|
|| ( e->err == ENOTCONN ) )
|
|
{
|
|
/* some protocol error from the peer */
|
|
peer->doPurge = 1;
|
|
}
|
|
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 struct in_addr * addr,
|
|
uint16_t 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 int
|
|
myHandshakeDoneCB( tr_handshake * handshake,
|
|
tr_peerIo * io,
|
|
int isConnected,
|
|
const uint8_t * peer_id,
|
|
void * vmanager )
|
|
{
|
|
int ok = isConnected;
|
|
int success = FALSE;
|
|
uint16_t port;
|
|
const struct in_addr * addr;
|
|
tr_peerMgr * manager = (tr_peerMgr*) vmanager;
|
|
Torrent * t;
|
|
tr_handshake * ours;
|
|
|
|
assert( io );
|
|
assert( isConnected == 0 || isConnected == 1 );
|
|
|
|
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;
|
|
}
|
|
|
|
tr_peerIoFree( io );
|
|
}
|
|
else /* looking good */
|
|
{
|
|
struct peer_atom * atom;
|
|
ensureAtomExists( t, addr, port, 0, TR_PEER_FROM_INCOMING );
|
|
atom = getExistingAtom( t, addr );
|
|
atom->time = time( NULL );
|
|
|
|
if( atom->myflags & MYFLAG_BANNED )
|
|
{
|
|
tordbg( t, "banned peer %s tried to reconnect",
|
|
tr_peerIoAddrStr( &atom->addr,
|
|
atom->port ) );
|
|
tr_peerIoFree( io );
|
|
}
|
|
else if( tr_peerIoIsIncoming( io )
|
|
&& ( getPeerCount( t ) >= getMaxPeerCount( t->tor ) ) )
|
|
|
|
{
|
|
tr_peerIoFree( io );
|
|
}
|
|
else
|
|
{
|
|
tr_peer * peer = getExistingPeer( t, addr );
|
|
|
|
if( peer ) /* we already have this peer */
|
|
{
|
|
tr_peerIoFree( io );
|
|
}
|
|
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 = io;
|
|
peer->msgs =
|
|
tr_peerMsgsNew( t->tor, peer, peerCallbackFunc, t,
|
|
&peer->msgsTag );
|
|
|
|
success = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( t )
|
|
torrentUnlock( t );
|
|
|
|
return success;
|
|
}
|
|
|
|
void
|
|
tr_peerMgrAddIncoming( tr_peerMgr * manager,
|
|
struct in_addr * addr,
|
|
uint16_t port,
|
|
int socket )
|
|
{
|
|
managerLock( manager );
|
|
|
|
if( tr_sessionIsAddressBlocked( manager->session, addr ) )
|
|
{
|
|
tr_dbg( "Banned IP address \"%s\" tried to connect to us",
|
|
inet_ntoa( *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, addr, port, socket );
|
|
|
|
handshake = tr_handshakeNew( io,
|
|
manager->session->encryptionMode,
|
|
myHandshakeDoneCB,
|
|
manager );
|
|
|
|
tr_ptrArrayInsertSorted( manager->incomingHandshakes, handshake,
|
|
handshakeCompare );
|
|
}
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrAddPex( tr_peerMgr * manager,
|
|
const uint8_t * torrentHash,
|
|
uint8_t from,
|
|
const tr_pex * pex )
|
|
{
|
|
Torrent * t;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( manager, torrentHash );
|
|
if( !tr_sessionIsAddressBlocked( t->manager->session, &pex->in_addr ) )
|
|
ensureAtomExists( t, &pex->in_addr, pex->port, pex->flags, from );
|
|
|
|
managerUnlock( 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 )
|
|
{
|
|
memcpy( &pex[i].in_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;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerMgrSetBlame( tr_peerMgr * manager,
|
|
const uint8_t * torrentHash,
|
|
tr_piece_index_t pieceIndex,
|
|
int success )
|
|
{
|
|
if( !success )
|
|
{
|
|
int peerCount, i;
|
|
Torrent * t = getExistingTorrent( manager, torrentHash );
|
|
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->in_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 =
|
|
memcmp( &a->in_addr, &b->in_addr, sizeof( struct in_addr ) );
|
|
|
|
if( i ) return i;
|
|
if( a->port < b->port ) return -1;
|
|
if( a->port > b->port ) return 1;
|
|
return 0;
|
|
}
|
|
|
|
int tr_pexCompare( const void * a,
|
|
const void * b );
|
|
|
|
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_peerMgr * manager,
|
|
const uint8_t * torrentHash,
|
|
tr_pex ** setme_pex )
|
|
{
|
|
int peerCount = 0;
|
|
const Torrent * t;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)manager, torrentHash );
|
|
if( !t )
|
|
{
|
|
*setme_pex = NULL;
|
|
}
|
|
else
|
|
{
|
|
int i;
|
|
const tr_peer ** peers = (const tr_peer **) tr_ptrArrayPeek( t->peers, &peerCount );
|
|
tr_pex * pex = tr_new( tr_pex, peerCount );
|
|
tr_pex * walk = pex;
|
|
|
|
for( i = 0; i < peerCount; ++i, ++walk )
|
|
{
|
|
const tr_peer * peer = peers[i];
|
|
walk->in_addr = peer->in_addr;
|
|
walk->port = peer->port;
|
|
walk->flags = 0;
|
|
if( peerPrefersCrypto( peer ) ) walk->flags |= ADDED_F_ENCRYPTION_FLAG;
|
|
if( peer->progress >= 1.0 ) walk->flags |= ADDED_F_SEED_FLAG;
|
|
}
|
|
|
|
assert( ( walk - pex ) == peerCount );
|
|
qsort( pex, peerCount, sizeof( tr_pex ), tr_pexCompare );
|
|
*setme_pex = pex;
|
|
}
|
|
|
|
managerUnlock( manager );
|
|
return peerCount;
|
|
}
|
|
|
|
static int reconnectPulse( void * vtorrent );
|
|
|
|
static int rechokePulse( void * vtorrent );
|
|
|
|
void
|
|
tr_peerMgrStartTorrent( tr_peerMgr * manager,
|
|
const uint8_t * torrentHash )
|
|
{
|
|
Torrent * t;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( manager, torrentHash );
|
|
|
|
assert( t );
|
|
assert( ( t->isRunning != 0 ) == ( t->reconnectTimer != NULL ) );
|
|
assert( ( t->isRunning != 0 ) == ( t->rechokeTimer != NULL ) );
|
|
|
|
if( !t->isRunning )
|
|
{
|
|
t->isRunning = 1;
|
|
|
|
t->reconnectTimer = tr_timerNew( t->manager->session,
|
|
reconnectPulse, t,
|
|
RECONNECT_PERIOD_MSEC );
|
|
|
|
t->rechokeTimer = tr_timerNew( t->manager->session,
|
|
rechokePulse, t,
|
|
RECHOKE_PERIOD_MSEC );
|
|
|
|
reconnectPulse( t );
|
|
|
|
rechokePulse( t );
|
|
|
|
if( !tr_ptrArrayEmpty( t->webseeds ) )
|
|
refillSoon( t );
|
|
}
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
static void
|
|
stopTorrent( Torrent * t )
|
|
{
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
t->isRunning = 0;
|
|
tr_timerFree( &t->rechokeTimer );
|
|
tr_timerFree( &t->reconnectTimer );
|
|
|
|
/* 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_peerMgr * manager,
|
|
const uint8_t * torrentHash )
|
|
{
|
|
managerLock( manager );
|
|
|
|
stopTorrent( getExistingTorrent( manager, torrentHash ) );
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrAddTorrent( tr_peerMgr * manager,
|
|
tr_torrent * tor )
|
|
{
|
|
Torrent * t;
|
|
|
|
managerLock( manager );
|
|
|
|
assert( tor );
|
|
assert( getExistingTorrent( manager, tor->info.hash ) == NULL );
|
|
|
|
t = torrentConstructor( manager, tor );
|
|
tr_ptrArrayInsertSorted( manager->torrents, t, torrentCompare );
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrRemoveTorrent( tr_peerMgr * manager,
|
|
const uint8_t * torrentHash )
|
|
{
|
|
Torrent * t;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( manager, torrentHash );
|
|
assert( t );
|
|
stopTorrent( t );
|
|
tr_ptrArrayRemoveSorted( manager->torrents, t, torrentCompare );
|
|
torrentDestructor( t );
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
void
|
|
tr_peerMgrTorrentAvailability( const tr_peerMgr * manager,
|
|
const uint8_t * torrentHash,
|
|
int8_t * tab,
|
|
unsigned int tabCount )
|
|
{
|
|
tr_piece_index_t i;
|
|
const Torrent * t;
|
|
const tr_torrent * tor;
|
|
float interval;
|
|
int isComplete;
|
|
int peerCount;
|
|
const tr_peer ** peers;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)manager, torrentHash );
|
|
tor = t->tor;
|
|
interval = tor->info.pieceCount / (float)tabCount;
|
|
isComplete = tor
|
|
&& ( tr_cpGetStatus ( tor->completion ) == TR_CP_COMPLETE );
|
|
peers = (const tr_peer **) tr_ptrArrayPeek( t->peers, &peerCount );
|
|
|
|
memset( tab, 0, tabCount );
|
|
|
|
for( i = 0; tor && i < tabCount; ++i )
|
|
{
|
|
const int piece = i * interval;
|
|
|
|
if( isComplete || 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];
|
|
}
|
|
}
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
/* Returns the pieces that are available from peers */
|
|
tr_bitfield*
|
|
tr_peerMgrGetAvailable( const tr_peerMgr * manager,
|
|
const uint8_t * torrentHash )
|
|
{
|
|
int i, size;
|
|
Torrent * t;
|
|
tr_peer ** peers;
|
|
tr_bitfield * pieces;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)manager, torrentHash );
|
|
pieces = tr_bitfieldNew( t->tor->info.pieceCount );
|
|
peers = getConnectedPeers( t, &size );
|
|
for( i = 0; i < size; ++i )
|
|
tr_bitfieldOr( pieces, peers[i]->have );
|
|
|
|
managerUnlock( manager );
|
|
tr_free( peers );
|
|
return pieces;
|
|
}
|
|
|
|
int
|
|
tr_peerMgrHasConnections( const tr_peerMgr * manager,
|
|
const uint8_t * torrentHash )
|
|
{
|
|
int ret;
|
|
const Torrent * t;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)manager, torrentHash );
|
|
ret = t && ( !tr_ptrArrayEmpty( t->peers )
|
|
|| !tr_ptrArrayEmpty( t->webseeds ) );
|
|
|
|
managerUnlock( manager );
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
tr_peerMgrTorrentStats( const tr_peerMgr * manager,
|
|
const uint8_t * torrentHash,
|
|
int * setmePeersKnown,
|
|
int * setmePeersConnected,
|
|
int * setmeSeedsConnected,
|
|
int * setmeWebseedsSendingToUs,
|
|
int * setmePeersSendingToUs,
|
|
int * setmePeersGettingFromUs,
|
|
int * setmePeersFrom )
|
|
{
|
|
int i, size;
|
|
const Torrent * t;
|
|
const tr_peer ** peers;
|
|
const tr_webseed ** webseeds;
|
|
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)manager, torrentHash );
|
|
peers = (const tr_peer **) tr_ptrArrayPeek( t->peers, &size );
|
|
|
|
*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->in_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_ptrArrayPeek( t->webseeds, &size );
|
|
for( i = 0; i < size; ++i )
|
|
{
|
|
if( tr_webseedIsActive( webseeds[i] ) )
|
|
++ * setmeWebseedsSendingToUs;
|
|
}
|
|
|
|
managerUnlock( manager );
|
|
}
|
|
|
|
double
|
|
tr_peerMgrGetRate( const tr_peerMgr * manager,
|
|
tr_direction direction )
|
|
{
|
|
int i;
|
|
double bytes = 0;
|
|
|
|
assert( manager != NULL );
|
|
assert( direction == TR_UP || direction == TR_DOWN );
|
|
|
|
for( i = 0; i < BANDWIDTH_PULSE_HISTORY; ++i )
|
|
bytes += manager->rateHistory[direction][i];
|
|
|
|
return ( BANDWIDTH_PULSES_PER_SECOND * bytes )
|
|
/ ( BANDWIDTH_PULSE_HISTORY * 1024 );
|
|
}
|
|
|
|
float*
|
|
tr_peerMgrWebSpeeds( const tr_peerMgr * manager,
|
|
const uint8_t * torrentHash )
|
|
{
|
|
const Torrent * t;
|
|
const tr_webseed ** webseeds;
|
|
int i;
|
|
int webseedCount;
|
|
float * ret;
|
|
|
|
assert( manager );
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)manager, torrentHash );
|
|
webseeds = (const tr_webseed**) tr_ptrArrayPeek( t->webseeds,
|
|
&webseedCount );
|
|
assert( webseedCount == t->tor->info.webseedCount );
|
|
ret = tr_new0( float, webseedCount );
|
|
|
|
for( i = 0; i < webseedCount; ++i )
|
|
if( !tr_webseedGetSpeed( webseeds[i], &ret[i] ) )
|
|
ret[i] = -1.0;
|
|
|
|
managerUnlock( manager );
|
|
return ret;
|
|
}
|
|
|
|
struct tr_peer_stat *
|
|
tr_peerMgrPeerStats( const tr_peerMgr * manager,
|
|
const uint8_t * torrentHash,
|
|
int * setmeCount UNUSED )
|
|
{
|
|
int i, size;
|
|
const Torrent * t;
|
|
tr_peer ** peers;
|
|
tr_peer_stat * ret;
|
|
|
|
assert( manager );
|
|
managerLock( manager );
|
|
|
|
t = getExistingTorrent( (tr_peerMgr*)manager, torrentHash );
|
|
peers = getConnectedPeers( (Torrent*)t, &size );
|
|
ret = tr_new0( tr_peer_stat, size );
|
|
|
|
for( i = 0; i < size; ++i )
|
|
{
|
|
char * pch;
|
|
const tr_peer * peer = peers[i];
|
|
const struct peer_atom * atom = getExistingAtom( t, &peer->in_addr );
|
|
tr_peer_stat * stat = ret + i;
|
|
|
|
tr_netNtop( &peer->in_addr, stat->addr, sizeof( stat->addr ) );
|
|
tr_strlcpy( stat->client, ( peer->client ? peer->client : "" ),
|
|
sizeof( stat->client ) );
|
|
stat->port = peer->port;
|
|
stat->from = atom->from;
|
|
stat->progress = peer->progress;
|
|
stat->isEncrypted = tr_peerIoIsEncrypted( peer->io ) ? 1 : 0;
|
|
stat->rateToPeer = tr_peerIoGetRateToPeer( peer->io );
|
|
stat->rateToClient = tr_peerIoGetRateToClient( peer->io );
|
|
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 );
|
|
|
|
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;
|
|
tr_free( peers );
|
|
|
|
managerUnlock( manager );
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
struct ChokeData
|
|
{
|
|
unsigned int doUnchoke : 1;
|
|
unsigned int isInterested : 1;
|
|
double rateToClient;
|
|
double rateToPeer;
|
|
tr_peer * peer;
|
|
};
|
|
|
|
static int
|
|
tr_compareDouble( double a,
|
|
double b )
|
|
{
|
|
if( a < b ) return -1;
|
|
if( a > b ) return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
compareChoke( const void * va,
|
|
const void * vb )
|
|
{
|
|
const struct ChokeData * a = va;
|
|
const struct ChokeData * b = vb;
|
|
int diff = 0;
|
|
|
|
if( diff == 0 ) /* prefer higher dl speeds */
|
|
diff = -tr_compareDouble( a->rateToClient, b->rateToClient );
|
|
if( diff == 0 ) /* prefer higher ul speeds */
|
|
diff = -tr_compareDouble( a->rateToPeer, b->rateToPeer );
|
|
if( diff == 0 ) /* prefer unchoked */
|
|
diff = (int)a->peer->peerIsChoked - (int)b->peer->peerIsChoked;
|
|
|
|
return diff;
|
|
}
|
|
|
|
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
|
|
rechoke( Torrent * t )
|
|
{
|
|
int i, peerCount, size, unchokedInterested;
|
|
tr_peer ** peers = getConnectedPeers( t, &peerCount );
|
|
struct ChokeData * choke = tr_new0( struct ChokeData, peerCount );
|
|
|
|
assert( torrentIsLocked( t ) );
|
|
|
|
/* sort the peers by preference and rate */
|
|
for( i = 0, size = 0; i < peerCount; ++i )
|
|
{
|
|
tr_peer * peer = peers[i];
|
|
if( peer->progress >= 1.0 ) /* choke all seeds */
|
|
tr_peerMsgsSetChoke( peer->msgs, TRUE );
|
|
else
|
|
{
|
|
struct ChokeData * node = &choke[size++];
|
|
node->peer = peer;
|
|
node->isInterested = peer->peerIsInterested;
|
|
node->rateToClient = tr_peerIoGetRateToClient( peer->io );
|
|
node->rateToPeer = tr_peerIoGetRateToPeer( peer->io );
|
|
}
|
|
}
|
|
|
|
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 < MAX_UNCHOKED_PEERS; ++i )
|
|
{
|
|
choke[i].doUnchoke = 1;
|
|
if( choke[i].isInterested )
|
|
++unchokedInterested;
|
|
}
|
|
|
|
/* optimistic unchoke */
|
|
if( i < size )
|
|
{
|
|
int n;
|
|
struct ChokeData * c;
|
|
tr_ptrArray * randPool = tr_ptrArrayNew( );
|
|
|
|
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_ptrArrayFree( randPool, NULL );
|
|
}
|
|
|
|
for( i = 0; i < size; ++i )
|
|
tr_peerMsgsSetChoke( choke[i].peer->msgs, !choke[i].doUnchoke );
|
|
|
|
/* cleanup */
|
|
tr_free( choke );
|
|
tr_free( peers );
|
|
}
|
|
|
|
static int
|
|
rechokePulse( void * vtorrent )
|
|
{
|
|
Torrent * t = vtorrent;
|
|
|
|
torrentLock( t );
|
|
rechoke( t );
|
|
torrentUnlock( t );
|
|
return TRUE;
|
|
}
|
|
|
|
/***
|
|
****
|
|
**** Life and Death
|
|
****
|
|
***/
|
|
|
|
static int
|
|
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->in_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 TRUE;
|
|
}
|
|
|
|
/* 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 TRUE;
|
|
}
|
|
}
|
|
|
|
/* 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 = lo + ( ( hi - lo ) * strictness );
|
|
const time_t then = peer->pieceDataActivityDate;
|
|
const int idleTime = then ? ( now - then ) : 0;
|
|
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 TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static tr_peer **
|
|
getPeersToClose( Torrent * t,
|
|
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 ) )
|
|
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;
|
|
|
|
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 ) )
|
|
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 int
|
|
reconnectPulse( void * vtorrent )
|
|
{
|
|
Torrent * t = vtorrent;
|
|
static time_t prevTime = 0;
|
|
static int newConnectionsThisSecond = 0;
|
|
time_t now;
|
|
|
|
torrentLock( t );
|
|
|
|
now = time( NULL );
|
|
if( prevTime != now )
|
|
{
|
|
prevTime = now;
|
|
newConnectionsThisSecond = 0;
|
|
}
|
|
|
|
if( !t->isRunning )
|
|
{
|
|
removeAllPeers( t );
|
|
}
|
|
else
|
|
{
|
|
int i, nCandidates, nBad;
|
|
struct peer_atom ** candidates = getPeerCandidates( t, &nCandidates );
|
|
struct tr_peer ** connections = getPeersToClose( t, &nBad );
|
|
|
|
if( nBad || nCandidates )
|
|
tordbg(
|
|
t, "reconnect pulse for [%s]: %d bad connections, "
|
|
"%d connection candidates, %d atoms, max per pulse is %d",
|
|
t->tor->info.name, nBad, nCandidates,
|
|
tr_ptrArraySize( t->pool ),
|
|
(int)MAX_RECONNECTIONS_PER_PULSE );
|
|
|
|
/* disconnect some peers.
|
|
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 */
|
|
for( i = 0; i < nBad; ++i )
|
|
{
|
|
tr_peer * peer = connections[i];
|
|
struct peer_atom * atom = getExistingAtom( t, &peer->in_addr );
|
|
if( peer->pieceDataActivityDate )
|
|
atom->numFails = 0;
|
|
else
|
|
++atom->numFails;
|
|
tordbg( t, "removing bad peer %s",
|
|
tr_peerIoGetAddrStr( peer->io ) );
|
|
removePeer( t, peer );
|
|
}
|
|
|
|
/* add some new ones */
|
|
for( i = 0; ( i < nCandidates )
|
|
&& ( i < MAX_RECONNECTIONS_PER_PULSE )
|
|
&& ( getPeerCount( t ) < getMaxPeerCount( t->tor ) )
|
|
&& ( newConnectionsThisSecond < MAX_CONNECTIONS_PER_SECOND );
|
|
++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, &atom->addr, atom->port,
|
|
t->hash );
|
|
if( io == NULL )
|
|
{
|
|
atom->myflags |= MYFLAG_UNREACHABLE;
|
|
}
|
|
else
|
|
{
|
|
tr_handshake * handshake = tr_handshakeNew(
|
|
io,
|
|
mgr->session->
|
|
encryptionMode,
|
|
myHandshakeDoneCB,
|
|
mgr );
|
|
|
|
assert( tr_peerIoGetTorrentHash( io ) );
|
|
|
|
++newConnectionsThisSecond;
|
|
|
|
tr_ptrArrayInsertSorted( t->outgoingHandshakes, handshake,
|
|
handshakeCompare );
|
|
}
|
|
|
|
atom->time = time( NULL );
|
|
}
|
|
|
|
/* cleanup */
|
|
tr_free( connections );
|
|
tr_free( candidates );
|
|
}
|
|
|
|
torrentUnlock( t );
|
|
return TRUE;
|
|
}
|
|
|
|
/****
|
|
*****
|
|
***** BANDWIDTH ALLOCATION
|
|
*****
|
|
****/
|
|
|
|
static double
|
|
allocateHowMuch( double desiredAvgKB,
|
|
const double * history )
|
|
{
|
|
const double baseline = desiredAvgKB * 1024.0 /
|
|
BANDWIDTH_PULSES_PER_SECOND;
|
|
const double min = baseline * 0.66;
|
|
const double max = baseline * 1.33;
|
|
int i;
|
|
double usedBytes;
|
|
double n;
|
|
double clamped;
|
|
|
|
for( usedBytes = i = 0; i < BANDWIDTH_PULSE_HISTORY; ++i )
|
|
usedBytes += history[i];
|
|
|
|
n = ( desiredAvgKB * 1024.0 )
|
|
* ( BANDWIDTH_PULSE_HISTORY + 1.0 )
|
|
/ BANDWIDTH_PULSES_PER_SECOND
|
|
- usedBytes;
|
|
|
|
/* clamp the return value to lessen oscillation */
|
|
clamped = n;
|
|
clamped = MAX( clamped, min );
|
|
clamped = MIN( clamped, max );
|
|
/*fprintf( stderr, "desiredAvgKB is %.2f, rate is %.2f, allocating %.2f
|
|
(%.2f)\n", desiredAvgKB,
|
|
((usedBytes*BANDWIDTH_PULSES_PER_SECOND)/BANDWIDTH_PULSE_HISTORY)/1024.0,
|
|
clamped/1024.0, n/1024.0 );*/
|
|
return clamped;
|
|
}
|
|
|
|
/**
|
|
* Distributes a fixed amount of bandwidth among a set of peers.
|
|
*
|
|
* @param peerArray peers whose client-to-peer bandwidth will be set
|
|
* @param direction whether to allocate upload or download bandwidth
|
|
* @param history recent bandwidth history for these peers
|
|
* @param desiredAvgKB overall bandwidth goal for this set of peers
|
|
*/
|
|
static void
|
|
setPeerBandwidth( tr_ptrArray * peerArray,
|
|
const tr_direction direction,
|
|
const double * history,
|
|
double desiredAvgKB )
|
|
{
|
|
const int peerCount = tr_ptrArraySize( peerArray );
|
|
const double bytes = allocateHowMuch( desiredAvgKB, history );
|
|
const double welfareBytes = MIN( 2048, bytes * 0.2 );
|
|
const double meritBytes = MAX( 0, bytes - welfareBytes );
|
|
tr_peer ** peers = (tr_peer**) tr_ptrArrayBase( peerArray );
|
|
tr_peer ** candidates = tr_new( tr_peer *, peerCount );
|
|
int i;
|
|
int candidateCount;
|
|
double welfare;
|
|
size_t bytesUsed;
|
|
|
|
assert( meritBytes >= 0.0 );
|
|
assert( welfareBytes >= 0.0 );
|
|
assert( direction == TR_UP || direction == TR_DOWN );
|
|
|
|
for( i = candidateCount = 0; i < peerCount; ++i )
|
|
if( tr_peerIoWantsBandwidth( peers[i]->io, direction ) )
|
|
candidates[candidateCount++] = peers[i];
|
|
else
|
|
tr_peerIoSetBandwidth( peers[i]->io, direction, 0 );
|
|
|
|
for( i = bytesUsed = 0; i < candidateCount; ++i )
|
|
bytesUsed += tr_peerIoGetBandwidthUsed( candidates[i]->io,
|
|
direction );
|
|
|
|
welfare = welfareBytes / candidateCount;
|
|
|
|
for( i = 0; i < candidateCount; ++i )
|
|
{
|
|
tr_peer * peer = candidates[i];
|
|
const double merit = bytesUsed
|
|
? ( meritBytes *
|
|
tr_peerIoGetBandwidthUsed( peer->io,
|
|
direction ) ) /
|
|
bytesUsed
|
|
: ( meritBytes / candidateCount );
|
|
tr_peerIoSetBandwidth( peer->io, direction, merit + welfare );
|
|
}
|
|
|
|
/* cleanup */
|
|
tr_free( candidates );
|
|
}
|
|
|
|
static size_t
|
|
countHandshakeBandwidth( tr_ptrArray * handshakes,
|
|
tr_direction direction )
|
|
{
|
|
const int n = tr_ptrArraySize( handshakes );
|
|
int i;
|
|
size_t total;
|
|
|
|
for( i = total = 0; i < n; ++i )
|
|
{
|
|
tr_peerIo * io = tr_handshakeGetIO( tr_ptrArrayNth( handshakes, i ) );
|
|
total += tr_peerIoGetBandwidthUsed( io, direction );
|
|
}
|
|
return total;
|
|
}
|
|
|
|
static size_t
|
|
countPeerBandwidth( tr_ptrArray * peers,
|
|
tr_direction direction )
|
|
{
|
|
const int n = tr_ptrArraySize( peers );
|
|
int i;
|
|
size_t total;
|
|
|
|
for( i = total = 0; i < n; ++i )
|
|
{
|
|
tr_peer * peer = tr_ptrArrayNth( peers, i );
|
|
total += tr_peerIoGetBandwidthUsed( peer->io, direction );
|
|
}
|
|
return total;
|
|
}
|
|
|
|
static void
|
|
givePeersUnlimitedBandwidth( tr_ptrArray * peers,
|
|
tr_direction direction )
|
|
{
|
|
const int n = tr_ptrArraySize( peers );
|
|
int i;
|
|
|
|
for( i = 0; i < n; ++i )
|
|
{
|
|
tr_peer * peer = tr_ptrArrayNth( peers, i );
|
|
tr_peerIoSetBandwidthUnlimited( peer->io, direction );
|
|
}
|
|
}
|
|
|
|
static void
|
|
pumpAllPeers( tr_peerMgr * mgr )
|
|
{
|
|
const int torrentCount = tr_ptrArraySize( mgr->torrents );
|
|
int i, j;
|
|
|
|
for( i = 0; i < torrentCount; ++i )
|
|
{
|
|
Torrent * t = tr_ptrArrayNth( mgr->torrents, i );
|
|
for( j = 0; j < tr_ptrArraySize( t->peers ); ++j )
|
|
{
|
|
tr_peer * peer = tr_ptrArrayNth( t->peers, j );
|
|
tr_peerMsgsPulse( peer->msgs );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Allocate bandwidth for each peer connection.
|
|
*
|
|
* @param mgr the peer manager
|
|
* @param direction whether to allocate upload or download bandwidth
|
|
* @return the amount of directional bandwidth used since the last pulse.
|
|
*/
|
|
static double
|
|
allocateBandwidth( tr_peerMgr * mgr,
|
|
tr_direction direction )
|
|
{
|
|
tr_session * session = mgr->session;
|
|
const int pulseNumber = mgr->bandwidthPulseNumber;
|
|
const int torrentCount = tr_ptrArraySize( mgr->torrents );
|
|
Torrent ** torrents = (Torrent **) tr_ptrArrayBase( mgr->torrents );
|
|
tr_ptrArray * globalPool = tr_ptrArrayNew( );
|
|
double allBytesUsed = 0;
|
|
size_t poolBytesUsed = 0;
|
|
int i;
|
|
|
|
assert( mgr );
|
|
assert( direction == TR_UP || direction == TR_DOWN );
|
|
|
|
/* before allocating bandwidth, pump the connected peers */
|
|
pumpAllPeers( mgr );
|
|
|
|
for( i = 0; i < torrentCount; ++i )
|
|
{
|
|
Torrent * t = torrents[i];
|
|
const size_t used = countPeerBandwidth( t->peers, direction );
|
|
countHandshakeBandwidth( t->outgoingHandshakes, direction );
|
|
|
|
/* remember this torrent's bytes used */
|
|
t->tor->rateHistory[direction][pulseNumber] = used;
|
|
|
|
/* add this torrent's bandwidth use to allBytesUsed */
|
|
allBytesUsed += used;
|
|
|
|
/* process the torrent's peers based on its speed mode */
|
|
switch( tr_torrentGetSpeedMode( t->tor, direction ) )
|
|
{
|
|
case TR_SPEEDLIMIT_UNLIMITED:
|
|
givePeersUnlimitedBandwidth( t->peers, direction );
|
|
break;
|
|
|
|
case TR_SPEEDLIMIT_SINGLE:
|
|
setPeerBandwidth( t->peers, direction,
|
|
t->tor->rateHistory[direction],
|
|
tr_torrentGetSpeedLimit( t->tor,
|
|
direction ) );
|
|
break;
|
|
|
|
case TR_SPEEDLIMIT_GLOBAL:
|
|
{
|
|
int i;
|
|
const int n = tr_ptrArraySize( t->peers );
|
|
for( i = 0; i < n; ++i )
|
|
tr_ptrArrayAppend( globalPool,
|
|
tr_ptrArrayNth( t->peers, i ) );
|
|
poolBytesUsed += used;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* add incoming handshakes to the global pool */
|
|
i = countHandshakeBandwidth( mgr->incomingHandshakes, direction );
|
|
allBytesUsed += i;
|
|
poolBytesUsed += i;
|
|
|
|
mgr->globalPoolHistory[direction][pulseNumber] = poolBytesUsed;
|
|
|
|
/* handle the global pool's connections */
|
|
if( !tr_sessionIsSpeedLimitEnabled( session, direction ) )
|
|
givePeersUnlimitedBandwidth( globalPool, direction );
|
|
else
|
|
setPeerBandwidth( globalPool, direction,
|
|
mgr->globalPoolHistory[direction],
|
|
tr_sessionGetSpeedLimit( session, direction ) );
|
|
|
|
/* now that we've allocated bandwidth, pump all the connected peers */
|
|
pumpAllPeers( mgr );
|
|
|
|
/* cleanup */
|
|
tr_ptrArrayFree( globalPool, NULL );
|
|
return allBytesUsed;
|
|
}
|
|
|
|
static int
|
|
bandwidthPulse( void * vmgr )
|
|
{
|
|
tr_peerMgr * mgr = vmgr;
|
|
int i;
|
|
|
|
managerLock( mgr );
|
|
|
|
/* keep track of how far we are into the cycle */
|
|
if( ++mgr->bandwidthPulseNumber == BANDWIDTH_PULSE_HISTORY )
|
|
mgr->bandwidthPulseNumber = 0;
|
|
|
|
/* allocate the upload and download bandwidth */
|
|
for( i = 0; i < 2; ++i )
|
|
mgr->rateHistory[i][mgr->bandwidthPulseNumber] =
|
|
allocateBandwidth( mgr, i );
|
|
|
|
managerUnlock( mgr );
|
|
return TRUE;
|
|
}
|
|
|