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transmission/libtransmission/peer-mgr.c

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/*
* This file Copyright (C) 2007-2009 Charles Kerr <charles@transmissionbt.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <errno.h>
#include <string.h> /* memcpy, memcmp, strstr */
#include <stdlib.h> /* qsort */
#include <limits.h> /* INT_MAX */
#include <event.h>
#include "transmission.h"
#include "session.h"
#include "bandwidth.h"
#include "bencode.h"
#include "blocklist.h"
#include "clients.h"
#include "completion.h"
#include "crypto.h"
#include "fdlimit.h"
#include "handshake.h"
#include "inout.h" /* tr_ioTestPiece */
#include "net.h"
#include "peer-io.h"
#include "peer-mgr.h"
#include "peer-msgs.h"
#include "ptrarray.h"
#include "stats.h" /* tr_statsAddUploaded, tr_statsAddDownloaded */
#include "torrent.h"
#include "trevent.h"
#include "utils.h"
#include "webseed.h"
enum
{
/* how frequently to change which peers are choked */
RECHOKE_PERIOD_MSEC = ( 10 * 1000 ),
/* minimum interval for refilling peers' request lists */
REFILL_PERIOD_MSEC = 400,
/* how frequently to reallocate bandwidth */
BANDWIDTH_PERIOD_MSEC = 500,
/* how frequently to age out old piece request lists */
REFILL_UPKEEP_PERIOD_MSEC = 1000,
/* how frequently to decide which peers live and die */
RECONNECT_PERIOD_MSEC = 500,
/* when many peers are available, keep idle ones this long */
MIN_UPLOAD_IDLE_SECS = ( 30 ),
/* when few peers are available, keep idle ones this long */
MAX_UPLOAD_IDLE_SECS = ( 60 * 5 ),
/* max # of peers to ask fer per torrent per reconnect pulse */
MAX_RECONNECTIONS_PER_PULSE = 16,
/* max number of peers to ask for per second overall.
* this throttle is to avoid overloading the router */
MAX_CONNECTIONS_PER_SECOND = 32,
/* number of bad pieces a peer is allowed to send before we ban them */
MAX_BAD_PIECES_PER_PEER = 5,
/* amount of time to keep a list of request pieces lying around
before it's considered too old and needs to be rebuilt */
PIECE_LIST_SHELF_LIFE_SECS = 60,
/* use for bitwise operations w/peer_atom.myflags */
MYFLAG_BANNED = 1,
/* use for bitwise operations w/peer_atom.myflags */
/* unreachable for now... but not banned.
* if they try to connect to us it's okay */
MYFLAG_UNREACHABLE = 2,
/* the minimum we'll wait before attempting to reconnect to a peer */
MINIMUM_RECONNECT_INTERVAL_SECS = 5
};
/**
***
**/
enum
{
UPLOAD_ONLY_UKNOWN,
UPLOAD_ONLY_YES,
UPLOAD_ONLY_NO
};
/**
* Peer information that should be kept even before we've connected and
* after we've disconnected. These are kept in a pool of peer_atoms to decide
* which ones would make good candidates for connecting to, and to watch out
* for banned peers.
*
* @see tr_peer
* @see tr_peermsgs
*/
struct peer_atom
{
uint8_t from;
uint8_t flags; /* these match the added_f flags */
uint8_t myflags; /* flags that aren't defined in added_f */
uint8_t uploadOnly; /* UPLOAD_ONLY_ */
tr_port port;
uint16_t numFails;
tr_address addr;
time_t time; /* when the peer's connection status last changed */
time_t piece_data_time;
};
struct tr_blockIterator
{
time_t expirationDate;
struct tr_torrent_peers * t;
tr_block_index_t blockIndex, blockCount, *blocks;
tr_piece_index_t pieceIndex, pieceCount, *pieces;
};
typedef struct tr_torrent_peers
{
tr_bool isRunning;
uint8_t hash[SHA_DIGEST_LENGTH];
int * pendingRequestCount;
tr_ptrArray outgoingHandshakes; /* tr_handshake */
tr_ptrArray pool; /* struct peer_atom */
tr_ptrArray peers; /* tr_peer */
tr_ptrArray webseeds; /* tr_webseed */
tr_timer * refillTimer;
tr_torrent * tor;
tr_peer * optimistic; /* the optimistic peer, or NULL if none */
struct tr_blockIterator * refillQueue; /* used in refillPulse() */
struct tr_peerMgr * manager;
}
Torrent;
struct tr_peerMgr
{
tr_session * session;
tr_ptrArray incomingHandshakes; /* tr_handshake */
tr_timer * bandwidthTimer;
tr_timer * rechokeTimer;
tr_timer * reconnectTimer;
tr_timer * refillUpkeepTimer;
};
#define tordbg( t, ... ) \
do { \
if( tr_deepLoggingIsActive( ) ) \
tr_deepLog( __FILE__, __LINE__, t->tor->info.name, __VA_ARGS__ ); \
} while( 0 )
#define dbgmsg( ... ) \
do { \
if( tr_deepLoggingIsActive( ) ) \
tr_deepLog( __FILE__, __LINE__, NULL, __VA_ARGS__ ); \
} while( 0 )
/**
***
**/
static TR_INLINE void
managerLock( const struct tr_peerMgr * manager )
{
tr_globalLock( manager->session );
}
static TR_INLINE void
managerUnlock( const struct tr_peerMgr * manager )
{
tr_globalUnlock( manager->session );
}
static TR_INLINE void
torrentLock( Torrent * torrent )
{
managerLock( torrent->manager );
}
static TR_INLINE void
torrentUnlock( Torrent * torrent )
{
managerUnlock( torrent->manager );
}
static TR_INLINE int
torrentIsLocked( const Torrent * t )
{
return tr_globalIsLocked( t->manager->session );
}
/**
***
**/
static int
handshakeCompareToAddr( const void * va, const void * vb )
{
const tr_handshake * a = va;
return tr_compareAddresses( tr_handshakeGetAddr( a, NULL ), vb );
}
static int
handshakeCompare( const void * a, const void * b )
{
return handshakeCompareToAddr( a, tr_handshakeGetAddr( b, NULL ) );
}
static tr_handshake*
getExistingHandshake( tr_ptrArray * handshakes,
const tr_address * addr )
{
return tr_ptrArrayFindSorted( handshakes, addr, handshakeCompareToAddr );
}
static int
comparePeerAtomToAddress( const void * va, const void * vb )
{
const struct peer_atom * a = va;
return tr_compareAddresses( &a->addr, vb );
}
static int
comparePeerAtoms( const void * va, const void * vb )
{
const struct peer_atom * b = vb;
return comparePeerAtomToAddress( va, &b->addr );
}
/**
***
**/
static Torrent*
getExistingTorrent( tr_peerMgr * manager,
const uint8_t * hash )
{
tr_torrent * tor = tr_torrentFindFromHash( manager->session, hash );
return tor == NULL ? NULL : tor->torrentPeers;
}
static int
peerCompare( const void * va, const void * vb )
{
const tr_peer * a = va;
const tr_peer * b = vb;
return tr_compareAddresses( &a->addr, &b->addr );
}
static int
peerCompareToAddr( const void * va, const void * vb )
{
const tr_peer * a = va;
return tr_compareAddresses( &a->addr, vb );
}
static tr_peer*
getExistingPeer( Torrent * torrent,
const tr_address * addr )
{
assert( torrentIsLocked( torrent ) );
assert( addr );
return tr_ptrArrayFindSorted( &torrent->peers, addr, peerCompareToAddr );
}
static struct peer_atom*
getExistingAtom( const Torrent * t,
const tr_address * addr )
{
Torrent * tt = (Torrent*)t;
assert( torrentIsLocked( t ) );
return tr_ptrArrayFindSorted( &tt->pool, addr, comparePeerAtomToAddress );
}
static tr_bool
peerIsInUse( const Torrent * ct,
const tr_address * addr )
{
Torrent * t = (Torrent*) ct;
assert( torrentIsLocked ( t ) );
return getExistingPeer( t, addr )
|| getExistingHandshake( &t->outgoingHandshakes, addr )
|| getExistingHandshake( &t->manager->incomingHandshakes, addr );
}
static tr_peer*
peerConstructor( const tr_address * addr )
{
tr_peer * p;
p = tr_new0( tr_peer, 1 );
p->addr = *addr;
return p;
}
static tr_peer*
getPeer( Torrent * torrent,
const tr_address * addr )
{
tr_peer * peer;
assert( torrentIsLocked( torrent ) );
peer = getExistingPeer( torrent, addr );
if( peer == NULL )
{
peer = peerConstructor( addr );
tr_ptrArrayInsertSorted( &torrent->peers, peer, peerCompare );
}
return peer;
}
static void
peerDestructor( tr_peer * peer )
{
assert( peer );
if( peer->msgs != NULL )
{
tr_peerMsgsUnsubscribe( peer->msgs, peer->msgsTag );
tr_peerMsgsFree( peer->msgs );
}
tr_peerIoClear( peer->io );
tr_peerIoUnref( peer->io ); /* balanced by the ref in handshakeDoneCB() */
tr_bitfieldFree( peer->have );
tr_bitfieldFree( peer->blame );
tr_free( peer->client );
tr_free( peer );
}
static void
removePeer( Torrent * t,
tr_peer * peer )
{
tr_peer * removed;
struct peer_atom * atom;
assert( torrentIsLocked( t ) );
atom = getExistingAtom( t, &peer->addr );
assert( atom );
atom->time = time( NULL );
removed = tr_ptrArrayRemoveSorted( &t->peers, peer, peerCompare );
assert( removed == peer );
peerDestructor( removed );
}
static void
removeAllPeers( Torrent * t )
{
while( !tr_ptrArrayEmpty( &t->peers ) )
removePeer( t, tr_ptrArrayNth( &t->peers, 0 ) );
}
static void blockIteratorFree( struct tr_blockIterator ** inout );
static void
torrentDestructor( void * vt )
{
Torrent * t = vt;
uint8_t hash[SHA_DIGEST_LENGTH];
assert( t );
assert( !t->isRunning );
assert( torrentIsLocked( t ) );
assert( tr_ptrArrayEmpty( &t->outgoingHandshakes ) );
assert( tr_ptrArrayEmpty( &t->peers ) );
memcpy( hash, t->hash, SHA_DIGEST_LENGTH );
tr_timerFree( &t->refillTimer );
blockIteratorFree( &t->refillQueue );
tr_ptrArrayDestruct( &t->webseeds, (PtrArrayForeachFunc)tr_webseedFree );
tr_ptrArrayDestruct( &t->pool, (PtrArrayForeachFunc)tr_free );
tr_ptrArrayDestruct( &t->outgoingHandshakes, NULL );
tr_ptrArrayDestruct( &t->peers, NULL );
tr_free( t->pendingRequestCount );
tr_free( t );
}
static void peerCallbackFunc( void * vpeer,
void * vevent,
void * vt );
static Torrent*
torrentConstructor( tr_peerMgr * manager,
tr_torrent * tor )
{
int i;
Torrent * t;
t = tr_new0( Torrent, 1 );
t->manager = manager;
t->tor = tor;
t->pool = TR_PTR_ARRAY_INIT;
t->peers = TR_PTR_ARRAY_INIT;
t->webseeds = TR_PTR_ARRAY_INIT;
t->outgoingHandshakes = TR_PTR_ARRAY_INIT;
memcpy( t->hash, tor->info.hash, SHA_DIGEST_LENGTH );
for( i = 0; i < tor->info.webseedCount; ++i )
{
tr_webseed * w =
tr_webseedNew( tor, tor->info.webseeds[i], peerCallbackFunc, t );
tr_ptrArrayAppend( &t->webseeds, w );
}
return t;
}
static int bandwidthPulse ( void * vmgr );
static int rechokePulse ( void * vmgr );
static int reconnectPulse ( void * vmgr );
static int refillUpkeep ( void * vmgr );
tr_peerMgr*
tr_peerMgrNew( tr_session * session )
{
tr_peerMgr * m = tr_new0( tr_peerMgr, 1 );
m->session = session;
m->incomingHandshakes = TR_PTR_ARRAY_INIT;
m->bandwidthTimer = tr_timerNew( session, bandwidthPulse, m, BANDWIDTH_PERIOD_MSEC );
m->rechokeTimer = tr_timerNew( session, rechokePulse, m, RECHOKE_PERIOD_MSEC );
m->reconnectTimer = tr_timerNew( session, reconnectPulse, m, RECONNECT_PERIOD_MSEC );
m->refillUpkeepTimer = tr_timerNew( session, refillUpkeep, m, REFILL_UPKEEP_PERIOD_MSEC );
rechokePulse( m );
return m;
}
void
tr_peerMgrFree( tr_peerMgr * manager )
{
managerLock( manager );
tr_timerFree( &manager->refillUpkeepTimer );
tr_timerFree( &manager->reconnectTimer );
tr_timerFree( &manager->rechokeTimer );
tr_timerFree( &manager->bandwidthTimer );
/* free the handshakes. Abort invokes handshakeDoneCB(), which removes
* the item from manager->handshakes, so this is a little roundabout... */
while( !tr_ptrArrayEmpty( &manager->incomingHandshakes ) )
tr_handshakeAbort( tr_ptrArrayNth( &manager->incomingHandshakes, 0 ) );
tr_ptrArrayDestruct( &manager->incomingHandshakes, NULL );
managerUnlock( manager );
tr_free( manager );
}
static int
clientIsDownloadingFrom( const tr_peer * peer )
{
return peer->clientIsInterested && !peer->clientIsChoked;
}
static int
clientIsUploadingTo( const tr_peer * peer )
{
return peer->peerIsInterested && !peer->peerIsChoked;
}
/***
****
***/
tr_bool
tr_peerMgrPeerIsSeed( const tr_torrent * tor,
const tr_address * addr )
{
tr_bool isSeed = FALSE;
const Torrent * t = tor->torrentPeers;
const struct peer_atom * 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;
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
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;
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 );
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;
}
}
}
/* 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
fireRatioLimitHit( tr_torrent * tor )
{
assert( tr_isTorrent( tor ) );
if( tor->ratio_limit_hit_func )
tor->ratio_limit_hit_func( tor, tor->ratio_limit_hit_func_user_data );
}
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;
double seedRatio;
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;
}
/* if we're seeding and we've reached our seed ratio limit, stop the torrent */
if( tr_torrentIsSeed( tor ) && tr_torrentGetSeedRatio( tor, &seedRatio ) ) {
const double up = tor->uploadedCur + tor->uploadedPrev;
const double down = tor->downloadedCur + tor->downloadedPrev;
const double ratio = tr_getRatio( up, down );
if( ratio >= seedRatio ) {
tr_torrentStop( tor );
/* set to no ratio limit to allow easy restarting */
tr_torrentSetRatioMode( tor, TR_RATIOLIMIT_UNLIMITED );
fireRatioLimitHit( 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 ) );
tr_suspectAddress( &pex[i].addr, "tracker" );
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_address norm_addr;
norm_addr = peer->addr;
tr_normalizeV4Mapped( &norm_addr );
tr_ntop( &norm_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;
}
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