655 lines
17 KiB
C
655 lines
17 KiB
C
/******************************************************************************
|
|
* $Id$
|
|
*
|
|
* Copyright (c) 2005-2006 Transmission authors and contributors
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*****************************************************************************/
|
|
|
|
#include "transmission.h"
|
|
|
|
#define MAX_REQUEST_COUNT 32
|
|
#define OUR_REQUEST_COUNT 8 /* TODO: we should detect if we are on a
|
|
high-speed network and adapt */
|
|
|
|
typedef struct tr_request_s
|
|
{
|
|
int index;
|
|
int begin;
|
|
int length;
|
|
|
|
} tr_request_t;
|
|
|
|
struct tr_peer_s
|
|
{
|
|
tr_torrent_t * tor;
|
|
|
|
struct in_addr addr;
|
|
in_port_t port; /* peer's listening port, 0 if not known */
|
|
|
|
#define PEER_STATUS_IDLE 1 /* Need to connect */
|
|
#define PEER_STATUS_CONNECTING 2 /* Trying to send handshake */
|
|
#define PEER_STATUS_HANDSHAKE 4 /* Waiting for peer's handshake */
|
|
#define PEER_STATUS_CONNECTED 8 /* Got peer's handshake */
|
|
int status;
|
|
int socket;
|
|
char incoming;
|
|
uint64_t date;
|
|
uint64_t keepAlive;
|
|
|
|
char amChoking;
|
|
char amInterested;
|
|
char peerChoking;
|
|
char peerInterested;
|
|
|
|
int optimistic;
|
|
uint64_t lastChoke;
|
|
|
|
uint8_t id[20];
|
|
|
|
/* The pieces that the peer has */
|
|
tr_bitfield_t * bitfield;
|
|
int pieceCount;
|
|
float progress;
|
|
|
|
int goodPcs;
|
|
int badPcs;
|
|
int banned;
|
|
/* The pieces that the peer is contributing to */
|
|
tr_bitfield_t * blamefield;
|
|
/* The bad pieces that the peer has contributed to */
|
|
tr_bitfield_t * banfield;
|
|
|
|
uint8_t * buf;
|
|
int size;
|
|
int pos;
|
|
|
|
uint8_t * outMessages;
|
|
int outMessagesSize;
|
|
int outMessagesPos;
|
|
uint8_t outBlock[13+16384];
|
|
int outBlockSize;
|
|
int outBlockLoaded;
|
|
int outBlockSending;
|
|
|
|
int inRequestCount;
|
|
tr_request_t inRequests[OUR_REQUEST_COUNT];
|
|
int inIndex;
|
|
int inBegin;
|
|
int inLength;
|
|
uint64_t inTotal;
|
|
|
|
int outRequestCount;
|
|
tr_request_t outRequests[MAX_REQUEST_COUNT];
|
|
uint64_t outTotal;
|
|
uint64_t outDate;
|
|
|
|
tr_ratecontrol_t * download;
|
|
tr_ratecontrol_t * upload;
|
|
};
|
|
|
|
#define peer_dbg( a... ) __peer_dbg( peer, ## a )
|
|
static void __peer_dbg( tr_peer_t * peer, char * msg, ... ) PRINTF( 2, 3 );
|
|
|
|
static void __peer_dbg( tr_peer_t * peer, char * msg, ... )
|
|
{
|
|
char string[256];
|
|
va_list args;
|
|
|
|
va_start( args, msg );
|
|
sprintf( string, "%08x:%04x ",
|
|
(uint32_t) peer->addr.s_addr, peer->port );
|
|
vsnprintf( &string[14], sizeof( string ) - 14, msg, args );
|
|
va_end( args );
|
|
|
|
tr_dbg( "%s", string );
|
|
}
|
|
|
|
#include "peermessages.h"
|
|
#include "peerutils.h"
|
|
#include "peerparse.h"
|
|
|
|
/***********************************************************************
|
|
* tr_peerInit
|
|
***********************************************************************
|
|
* Initializes a new peer.
|
|
**********************************************************************/
|
|
tr_peer_t * tr_peerInit( struct in_addr addr, in_port_t port, int s )
|
|
{
|
|
tr_peer_t * peer = peerInit();
|
|
|
|
peer->socket = s;
|
|
peer->addr = addr;
|
|
peer->port = port;
|
|
if( s >= 0 )
|
|
{
|
|
peer->status = PEER_STATUS_CONNECTING;
|
|
peer->incoming = 1;
|
|
}
|
|
else
|
|
{
|
|
peer->status = PEER_STATUS_IDLE;
|
|
}
|
|
|
|
return peer;
|
|
}
|
|
|
|
void tr_peerDestroy( tr_peer_t * peer )
|
|
{
|
|
tr_torrent_t * tor = peer->tor;
|
|
tr_request_t * r;
|
|
int i, block;
|
|
|
|
for( i = 0; i < peer->inRequestCount; i++ )
|
|
{
|
|
r = &peer->inRequests[i];
|
|
block = tr_block( r->index, r->begin );
|
|
tr_cpDownloaderRem( tor->completion, block );
|
|
}
|
|
tr_bitfieldFree( peer->bitfield );
|
|
tr_bitfieldFree( peer->blamefield );
|
|
tr_bitfieldFree( peer->banfield );
|
|
if( peer->buf )
|
|
{
|
|
free( peer->buf );
|
|
}
|
|
if( peer->outMessages )
|
|
{
|
|
free( peer->outMessages );
|
|
}
|
|
if( peer->status > PEER_STATUS_IDLE )
|
|
{
|
|
tr_netClose( peer->socket );
|
|
}
|
|
tr_rcClose( peer->download );
|
|
tr_rcClose( peer->upload );
|
|
free( peer );
|
|
}
|
|
|
|
void tr_peerSetTorrent( tr_peer_t * peer, tr_torrent_t * tor )
|
|
{
|
|
peer->tor = tor;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerRead
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
int tr_peerRead( tr_peer_t * peer )
|
|
{
|
|
tr_torrent_t * tor = peer->tor;
|
|
int ret;
|
|
|
|
/* Try to read */
|
|
for( ;; )
|
|
{
|
|
if( tor )
|
|
{
|
|
if( tor->customDownloadLimit )
|
|
{
|
|
if( !tr_rcCanTransfer( tor->download ) )
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tr_lockUnlock( &tor->lock );
|
|
if( !tr_rcCanGlobalTransfer( tor->handle, 0 ) )
|
|
{
|
|
tr_lockLock( &tor->lock );
|
|
break;
|
|
}
|
|
tr_lockLock( &tor->lock );
|
|
}
|
|
}
|
|
|
|
if( peer->size < 1 )
|
|
{
|
|
peer->size = 1024;
|
|
peer->buf = malloc( peer->size );
|
|
}
|
|
else if( peer->pos >= peer->size )
|
|
{
|
|
peer->size *= 2;
|
|
peer->buf = realloc( peer->buf, peer->size );
|
|
}
|
|
/* Never read more than 1K each time, otherwise the rate
|
|
control is no use */
|
|
ret = tr_netRecv( peer->socket, &peer->buf[peer->pos],
|
|
MIN( 1024, peer->size - peer->pos ) );
|
|
if( ret & TR_NET_CLOSE )
|
|
{
|
|
peer_dbg( "connection closed" );
|
|
return TR_ERROR;
|
|
}
|
|
else if( ret & TR_NET_BLOCK )
|
|
{
|
|
break;
|
|
}
|
|
peer->date = tr_date();
|
|
peer->pos += ret;
|
|
if( NULL != tor )
|
|
{
|
|
tr_rcTransferred( peer->download, ret );
|
|
tr_rcTransferred( tor->download, ret );
|
|
if( ( ret = parseBuf( tor, peer ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( ( ret = parseBufHeader( peer ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
return TR_OK;
|
|
}
|
|
|
|
uint64_t tr_peerDate( tr_peer_t * peer )
|
|
{
|
|
return peer->date;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerId
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
uint8_t * tr_peerId( tr_peer_t * peer )
|
|
{
|
|
return & peer->id[0];
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerAddress
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
struct in_addr * tr_peerAddress( tr_peer_t * peer )
|
|
{
|
|
return &peer->addr;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerHash
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
uint8_t * tr_peerHash( tr_peer_t * peer )
|
|
{
|
|
return parseBufHash( peer );
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerPulse
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
int tr_peerPulse( tr_peer_t * peer )
|
|
{
|
|
tr_torrent_t * tor = peer->tor;
|
|
int ret, size;
|
|
uint8_t * p;
|
|
|
|
if( ( ret = checkPeer( peer ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Connect */
|
|
if( peer->status & PEER_STATUS_IDLE )
|
|
{
|
|
peer->socket = tr_netOpenTCP( peer->addr, peer->port, 0 );
|
|
if( peer->socket < 0 )
|
|
{
|
|
return TR_ERROR;
|
|
}
|
|
peer->status = PEER_STATUS_CONNECTING;
|
|
}
|
|
|
|
/* Try to send handshake */
|
|
if( peer->status & PEER_STATUS_CONNECTING )
|
|
{
|
|
uint8_t buf[68];
|
|
tr_info_t * inf = &tor->info;
|
|
|
|
buf[0] = 19;
|
|
memcpy( &buf[1], "BitTorrent protocol", 19 );
|
|
memset( &buf[20], 0, 8 );
|
|
memcpy( &buf[28], inf->hash, 20 );
|
|
memcpy( &buf[48], tor->id, 20 );
|
|
|
|
switch( tr_netSend( peer->socket, buf, 68 ) )
|
|
{
|
|
case 68:
|
|
peer_dbg( "SEND handshake" );
|
|
peer->status = PEER_STATUS_HANDSHAKE;
|
|
break;
|
|
case TR_NET_BLOCK:
|
|
break;
|
|
default:
|
|
peer_dbg( "connection closed" );
|
|
return TR_ERROR;
|
|
}
|
|
}
|
|
if( peer->status < PEER_STATUS_HANDSHAKE )
|
|
{
|
|
/* Nothing more we can do till we sent the handshake */
|
|
return TR_OK;
|
|
}
|
|
|
|
/* Read incoming messages */
|
|
if( ( ret = tr_peerRead( peer ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
if( peer->status < PEER_STATUS_CONNECTED )
|
|
{
|
|
/* Nothing more we can do till we got the other guy's handshake */
|
|
return TR_OK;
|
|
}
|
|
|
|
/* Try to write */
|
|
writeBegin:
|
|
|
|
/* Send all smaller messages regardless of the upload cap */
|
|
while( ( p = messagesPending( peer, &size ) ) )
|
|
{
|
|
ret = tr_netSend( peer->socket, p, size );
|
|
if( ret & TR_NET_CLOSE )
|
|
{
|
|
return TR_ERROR;
|
|
}
|
|
else if( ret & TR_NET_BLOCK )
|
|
{
|
|
goto writeEnd;
|
|
}
|
|
messagesSent( peer, ret );
|
|
}
|
|
|
|
/* Send pieces if we can */
|
|
while( ( p = blockPending( tor, peer, &size ) ) )
|
|
{
|
|
if( tor->customUploadLimit )
|
|
{
|
|
if( !tr_rcCanTransfer( tor->upload ) )
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tr_lockUnlock( &tor->lock );
|
|
if( !tr_rcCanGlobalTransfer( tor->handle, 1 ) )
|
|
{
|
|
tr_lockLock( &tor->lock );
|
|
break;
|
|
}
|
|
tr_lockLock( &tor->lock );
|
|
}
|
|
|
|
ret = tr_netSend( peer->socket, p, size );
|
|
if( ret & TR_NET_CLOSE )
|
|
{
|
|
return TR_ERROR;
|
|
}
|
|
else if( ret & TR_NET_BLOCK )
|
|
{
|
|
break;
|
|
}
|
|
|
|
blockSent( peer, ret );
|
|
tr_rcTransferred( peer->upload, ret );
|
|
tr_rcTransferred( tor->upload, ret );
|
|
|
|
tor->uploadedCur += ret;
|
|
peer->outTotal += ret;
|
|
peer->outDate = tr_date();
|
|
|
|
/* In case this block is done, you may have messages
|
|
pending. Send them before we start the next block */
|
|
goto writeBegin;
|
|
}
|
|
writeEnd:
|
|
|
|
/* Ask for a block whenever possible */
|
|
if( !tr_cpIsSeeding( tor->completion ) &&
|
|
!peer->amInterested && tor->peerCount > TR_MAX_PEER_COUNT - 2 )
|
|
{
|
|
/* This peer is no use to us, and it seems there are
|
|
more */
|
|
peer_dbg( "not interesting" );
|
|
return TR_ERROR;
|
|
}
|
|
|
|
if( peer->amInterested && !peer->peerChoking && !peer->banned )
|
|
{
|
|
int block;
|
|
while( peer->inRequestCount < OUR_REQUEST_COUNT )
|
|
{
|
|
block = chooseBlock( tor, peer );
|
|
if( block < 0 )
|
|
{
|
|
break;
|
|
}
|
|
sendRequest( tor, peer, block );
|
|
}
|
|
}
|
|
|
|
return TR_OK;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerIsConnected
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
int tr_peerIsConnected( tr_peer_t * peer )
|
|
{
|
|
return peer->status & PEER_STATUS_CONNECTED;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerIsIncoming
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
int tr_peerIsIncoming( tr_peer_t * peer )
|
|
{
|
|
return peer->incoming;
|
|
}
|
|
|
|
int tr_peerAmChoking( tr_peer_t * peer )
|
|
{
|
|
return peer->amChoking;
|
|
}
|
|
int tr_peerAmInterested( tr_peer_t * peer )
|
|
{
|
|
return peer->amInterested;
|
|
}
|
|
int tr_peerIsChoking( tr_peer_t * peer )
|
|
{
|
|
return peer->peerChoking;
|
|
}
|
|
int tr_peerIsInterested( tr_peer_t * peer )
|
|
{
|
|
return peer->peerInterested;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerProgress
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
float tr_peerProgress( tr_peer_t * peer )
|
|
{
|
|
return peer->progress;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerPort
|
|
***********************************************************************
|
|
* Returns peer's listening port in host byte order
|
|
**********************************************************************/
|
|
int tr_peerPort( tr_peer_t * peer )
|
|
{
|
|
return ntohs( peer->port );
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerBitfield
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
tr_bitfield_t * tr_peerBitfield( tr_peer_t * peer )
|
|
{
|
|
return peer->bitfield;
|
|
}
|
|
|
|
float tr_peerDownloadRate( tr_peer_t * peer )
|
|
{
|
|
return tr_rcRate( peer->download );
|
|
}
|
|
|
|
float tr_peerUploadRate( tr_peer_t * peer )
|
|
{
|
|
return tr_rcRate( peer->upload );
|
|
}
|
|
|
|
void tr_peerChoke( tr_peer_t * peer )
|
|
{
|
|
sendChoke( peer, 1 );
|
|
peer->lastChoke = tr_date();
|
|
}
|
|
|
|
void tr_peerUnchoke( tr_peer_t * peer )
|
|
{
|
|
sendChoke( peer, 0 );
|
|
peer->lastChoke = tr_date();
|
|
}
|
|
|
|
uint64_t tr_peerLastChoke( tr_peer_t * peer )
|
|
{
|
|
return peer->lastChoke;
|
|
}
|
|
|
|
void tr_peerSetOptimistic( tr_peer_t * peer, int o )
|
|
{
|
|
peer->optimistic = o;
|
|
}
|
|
|
|
int tr_peerIsOptimistic( tr_peer_t * peer )
|
|
{
|
|
return peer->optimistic;
|
|
}
|
|
|
|
static inline int peerIsBad( tr_peer_t * peer )
|
|
{
|
|
return ( peer->badPcs > 4 + 2 * peer->goodPcs );
|
|
}
|
|
|
|
static inline int peerIsGood( tr_peer_t * peer )
|
|
{
|
|
return ( peer->goodPcs > 3 * peer->badPcs );
|
|
}
|
|
|
|
void tr_peerBlame( tr_peer_t * peer, int piece, int success )
|
|
{
|
|
tr_torrent_t * tor = peer->tor;
|
|
|
|
if( !peer->blamefield || !tr_bitfieldHas( peer->blamefield, piece ) )
|
|
{
|
|
return;
|
|
}
|
|
|
|
if( success )
|
|
{
|
|
peer->goodPcs++;
|
|
|
|
if( peer->banfield && peerIsGood( peer ) )
|
|
{
|
|
/* Assume the peer wasn't responsible for the bad pieces
|
|
we was banned for */
|
|
tr_bitfieldClear( peer->banfield );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
peer->badPcs++;
|
|
|
|
/* Ban the peer for this piece */
|
|
if( !peer->banfield )
|
|
{
|
|
peer->banfield = tr_bitfieldNew( tor->info.pieceCount );
|
|
}
|
|
tr_bitfieldAdd( peer->banfield, piece );
|
|
|
|
if( peerIsBad( peer ) )
|
|
{
|
|
/* Full ban */
|
|
peer_dbg( "banned (%d / %d)", peer->goodPcs, peer->badPcs );
|
|
peer->banned = 1;
|
|
peer->peerInterested = 0;
|
|
}
|
|
}
|
|
tr_bitfieldRem( peer->blamefield, piece );
|
|
}
|
|
|
|
int tr_peerGetConnectable( tr_torrent_t * tor, uint8_t ** _buf )
|
|
{
|
|
int count = 0;
|
|
uint8_t * buf;
|
|
tr_peer_t * peer;
|
|
int i;
|
|
|
|
if( tor->peerCount < 1 )
|
|
{
|
|
*_buf = NULL;
|
|
return 0;
|
|
}
|
|
|
|
buf = malloc( 6 * tor->peerCount );
|
|
for( i = 0; i < tor->peerCount; i++ )
|
|
{
|
|
peer = tor->peers[i];
|
|
|
|
/* Skip peers with no known listening port */
|
|
if( 0 == peer->port )
|
|
continue;
|
|
|
|
memcpy( &buf[count*6], &peer->addr, 4 );
|
|
memcpy( &buf[count*6+4], &peer->port, 2 );
|
|
count++;
|
|
}
|
|
|
|
if( count < 1 )
|
|
{
|
|
free( buf ); buf = NULL;
|
|
}
|
|
*_buf = buf;
|
|
|
|
return count * 6;
|
|
}
|