mirror of
https://github.com/transmission/transmission
synced 2024-12-27 01:57:52 +00:00
717 lines
19 KiB
C
717 lines
19 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2005-2007 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#include "transmission.h"
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#include "peertree.h"
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#define MAX_REQUEST_COUNT 32
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#define OUR_REQUEST_COUNT 8 /* TODO: we should detect if we are on a
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high-speed network and adapt */
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#define PEX_PEER_CUTOFF 50 /* only try to add new peers from pex if
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we have fewer existing peers than this */
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#define PEX_INTERVAL 60 /* don't send pex messages more frequently
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than PEX_INTERVAL +
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rand( PEX_INTERVAL / 10 ) seconds */
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#define PEER_SUPPORTS_EXTENDED_MESSAGES( bits ) ( (bits)[5] & 0x10 )
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#define PEER_SUPPORTS_AZUREUS_PROTOCOL( bits ) ( (bits)[0] & 0x80 )
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#define PEER_MSG_CHOKE 0
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#define PEER_MSG_UNCHOKE 1
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#define PEER_MSG_INTERESTED 2
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#define PEER_MSG_UNINTERESTED 3
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#define PEER_MSG_HAVE 4
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#define PEER_MSG_BITFIELD 5
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#define PEER_MSG_REQUEST 6
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#define PEER_MSG_PIECE 7
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#define PEER_MSG_CANCEL 8
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#define PEER_MSG_PORT 9
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#define PEER_MSG_EXTENDED 20
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typedef struct tr_request_s
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{
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int index;
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int begin;
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int length;
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} tr_request_t;
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struct tr_peer_s
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{
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tr_torrent_t * tor;
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struct in_addr addr;
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in_port_t port; /* peer's listening port, 0 if not known */
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#define PEER_STATUS_IDLE 1 /* Need to connect */
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#define PEER_STATUS_CONNECTING 2 /* Trying to send handshake */
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#define PEER_STATUS_HANDSHAKE 3 /* Waiting for peer's handshake */
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#define PEER_STATUS_AZ_GIVER 4 /* Sending Azureus handshake */
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#define PEER_STATUS_AZ_RECEIVER 5 /* Receiving Azureus handshake */
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#define PEER_STATUS_CONNECTED 6 /* Got peer's handshake */
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int status;
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int socket;
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char from;
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char private;
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char azproto; /* azureus peer protocol is being used */
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uint64_t date;
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uint64_t keepAlive;
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#define EXTENDED_NOT_SUPPORTED 0 /* extended messages not supported */
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#define EXTENDED_SUPPORTED 1 /* waiting to send extended handshake */
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#define EXTENDED_HANDSHAKE 2 /* sent extended handshake */
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uint8_t extStatus;
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uint8_t pexStatus; /* peer's ut_pex id, 0 if not supported */
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uint64_t lastPex; /* time when last pex packet was sent */
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int advertisedPort; /* listening port we last told peer */
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tr_peertree_t sentPeers;
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char amChoking;
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char amInterested;
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char peerChoking;
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char peerInterested;
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int optimistic;
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uint64_t lastChoke;
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uint8_t id[TR_ID_LEN];
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/* The pieces that the peer has */
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tr_bitfield_t * bitfield;
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int pieceCount;
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float progress;
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int goodPcs;
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int badPcs;
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int banned;
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/* The pieces that the peer is contributing to */
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tr_bitfield_t * blamefield;
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/* The bad pieces that the peer has contributed to */
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tr_bitfield_t * banfield;
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uint8_t * buf;
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int size;
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int pos;
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uint8_t * outMessages;
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int outMessagesSize;
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int outMessagesPos;
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uint8_t outBlock[25+16384];
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int outBlockSize;
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int outBlockLoaded;
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int outBlockSending;
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int inRequestCount;
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tr_request_t inRequests[OUR_REQUEST_COUNT];
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int inIndex;
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int inBegin;
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int inLength;
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uint64_t inTotal;
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int outRequestCount;
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tr_request_t outRequests[MAX_REQUEST_COUNT];
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uint64_t outTotal;
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uint64_t outDate;
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tr_ratecontrol_t * download;
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tr_ratecontrol_t * upload;
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};
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#define peer_dbg( a... ) __peer_dbg( peer, ## a )
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static void __peer_dbg( tr_peer_t * peer, char * msg, ... ) PRINTF( 2, 3 );
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static void __peer_dbg( tr_peer_t * peer, char * msg, ... )
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{
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char string[256];
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va_list args;
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va_start( args, msg );
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snprintf( string, sizeof string, "%08x:%04x ",
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(uint32_t) peer->addr.s_addr, peer->port );
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vsnprintf( &string[14], sizeof( string ) - 14, msg, args );
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va_end( args );
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tr_dbg( "%s", string );
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}
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#include "peerext.h"
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#include "peeraz.h"
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#include "peermessages.h"
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#include "peerutils.h"
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#include "peerparse.h"
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/***********************************************************************
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* tr_peerInit
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***********************************************************************
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* Initializes a new peer.
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**********************************************************************/
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tr_peer_t * tr_peerInit( struct in_addr addr, in_port_t port, int s, int from )
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{
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tr_peer_t * peer = peerInit();
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assert( 0 <= from && TR_PEER_FROM__MAX > from );
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peer->socket = s;
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peer->addr = addr;
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peer->port = port;
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peer->from = from;
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if( s >= 0 )
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{
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assert( TR_PEER_FROM_INCOMING == from );
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peer->status = PEER_STATUS_CONNECTING;
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}
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else
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{
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peer->status = PEER_STATUS_IDLE;
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}
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return peer;
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}
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void tr_peerDestroy( tr_peer_t * peer )
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{
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tr_torrent_t * tor = peer->tor;
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tr_request_t * r;
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int i, block;
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peertreeFree( &peer->sentPeers );
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for( i = 0; i < peer->inRequestCount; i++ )
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{
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r = &peer->inRequests[i];
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block = tr_block( r->index, r->begin );
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tr_cpDownloaderRem( tor->completion, block );
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}
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tr_bitfieldFree( peer->bitfield );
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tr_bitfieldFree( peer->blamefield );
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tr_bitfieldFree( peer->banfield );
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if( peer->buf )
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{
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free( peer->buf );
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}
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if( peer->outMessages )
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{
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free( peer->outMessages );
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}
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if( peer->status > PEER_STATUS_IDLE )
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{
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tr_netClose( peer->socket );
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}
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tr_rcClose( peer->download );
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tr_rcClose( peer->upload );
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free( peer );
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}
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void tr_peerSetPrivate( tr_peer_t * peer, int private )
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{
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peer->private = private;
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}
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void tr_peerSetTorrent( tr_peer_t * peer, tr_torrent_t * tor )
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{
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peer->tor = tor;
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}
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/***********************************************************************
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* tr_peerRead
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***********************************************************************
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*
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**********************************************************************/
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int tr_peerRead( tr_peer_t * peer )
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{
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tr_torrent_t * tor = peer->tor;
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int ret;
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/* Try to read */
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for( ;; )
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{
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if( tor )
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{
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if( tor->customDownloadLimit )
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{
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if( !tr_rcCanTransfer( tor->download ) )
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{
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break;
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}
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}
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else
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{
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tr_lockUnlock( &tor->lock );
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if( !tr_rcCanGlobalTransfer( tor->handle, 0 ) )
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{
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tr_lockLock( &tor->lock );
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break;
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}
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tr_lockLock( &tor->lock );
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}
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}
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if( peer->size < 1 )
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{
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peer->size = 1024;
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peer->buf = malloc( peer->size );
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}
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else if( peer->pos >= peer->size )
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{
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peer->size *= 2;
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peer->buf = realloc( peer->buf, peer->size );
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}
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/* Never read more than 1K each time, otherwise the rate
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control is no use */
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ret = tr_netRecv( peer->socket, &peer->buf[peer->pos],
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MIN( 1024, peer->size - peer->pos ) );
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if( ret & TR_NET_CLOSE )
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{
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peer_dbg( "connection closed" );
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return TR_ERROR;
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}
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else if( ret & TR_NET_BLOCK )
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{
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break;
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}
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peer->date = tr_date();
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peer->pos += ret;
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if( NULL != tor )
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{
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tr_rcTransferred( peer->download, ret );
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tr_rcTransferred( tor->download, ret );
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if( ( ret = parseBuf( tor, peer ) ) )
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{
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return ret;
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}
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}
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else
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{
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if( ( ret = parseBufHeader( peer ) ) )
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{
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return ret;
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}
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}
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}
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return TR_OK;
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}
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uint64_t tr_peerDate( tr_peer_t * peer )
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{
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return peer->date;
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}
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/***********************************************************************
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* tr_peerId
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***********************************************************************
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*
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**********************************************************************/
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uint8_t * tr_peerId( tr_peer_t * peer )
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{
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return & peer->id[0];
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}
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/***********************************************************************
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* tr_peerAddress
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***********************************************************************
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*
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**********************************************************************/
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struct in_addr * tr_peerAddress( tr_peer_t * peer )
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{
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return &peer->addr;
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}
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/***********************************************************************
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* tr_peerHash
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***********************************************************************
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*
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**********************************************************************/
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uint8_t * tr_peerHash( tr_peer_t * peer )
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{
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return parseBufHash( peer );
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}
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/***********************************************************************
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* tr_peerPulse
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***********************************************************************
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*
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**********************************************************************/
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int tr_peerPulse( tr_peer_t * peer )
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{
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tr_torrent_t * tor = peer->tor;
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int ret, size;
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uint8_t * p;
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if( ( ret = checkPeer( peer ) ) )
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{
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return ret;
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}
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/* Connect */
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if( PEER_STATUS_IDLE == peer->status )
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{
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peer->socket = tr_netOpenTCP( peer->addr, peer->port, 0 );
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if( peer->socket < 0 )
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{
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return TR_ERROR;
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}
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peer->status = PEER_STATUS_CONNECTING;
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}
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/* Try to send handshake */
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if( PEER_STATUS_CONNECTING == peer->status )
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{
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uint8_t buf[68];
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tr_info_t * inf = &tor->info;
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buf[0] = 19;
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memcpy( &buf[1], "BitTorrent protocol", 19 );
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memset( &buf[20], 0, 8 );
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buf[20] = 0x80; /* azureus protocol */
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buf[25] = 0x10; /* extended messages */
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memcpy( &buf[28], inf->hash, 20 );
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memcpy( &buf[48], tor->id, 20 );
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switch( tr_netSend( peer->socket, buf, 68 ) )
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{
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case 68:
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peer_dbg( "SEND handshake" );
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peer->status = PEER_STATUS_HANDSHAKE;
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break;
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case TR_NET_BLOCK:
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break;
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default:
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peer_dbg( "connection closed" );
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return TR_ERROR;
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}
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}
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if( peer->status < PEER_STATUS_HANDSHAKE )
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{
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/* Nothing more we can do till we sent the handshake */
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return TR_OK;
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}
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/* Read incoming messages */
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if( ( ret = tr_peerRead( peer ) ) )
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{
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return ret;
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}
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/* Try to send Azureus handshake */
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if( PEER_STATUS_AZ_GIVER == peer->status )
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{
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switch( sendAZHandshake( tor, peer ) )
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{
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case TR_NET_BLOCK:
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break;
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case TR_NET_CLOSE:
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peer_dbg( "connection closed" );
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return TR_ERROR;
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default:
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peer->status = PEER_STATUS_AZ_RECEIVER;
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break;
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}
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}
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if( peer->status < PEER_STATUS_CONNECTED )
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{
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/* Nothing more we can do till we got the other guy's handshake */
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return TR_OK;
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}
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/* Try to write */
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writeBegin:
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/* Send all smaller messages regardless of the upload cap */
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while( ( p = messagesPending( peer, &size ) ) )
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{
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ret = tr_netSend( peer->socket, p, size );
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if( ret & TR_NET_CLOSE )
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{
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return TR_ERROR;
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}
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else if( ret & TR_NET_BLOCK )
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{
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goto writeEnd;
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}
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messagesSent( peer, ret );
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}
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/* Send pieces if we can */
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while( ( p = blockPending( tor, peer, &size ) ) )
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{
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if( tor->customUploadLimit )
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{
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if( !tr_rcCanTransfer( tor->upload ) )
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{
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break;
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}
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}
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else
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{
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tr_lockUnlock( &tor->lock );
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if( !tr_rcCanGlobalTransfer( tor->handle, 1 ) )
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{
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tr_lockLock( &tor->lock );
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break;
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}
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tr_lockLock( &tor->lock );
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}
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ret = tr_netSend( peer->socket, p, size );
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if( ret & TR_NET_CLOSE )
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{
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return TR_ERROR;
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}
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else if( ret & TR_NET_BLOCK )
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{
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break;
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}
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blockSent( peer, ret );
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tr_rcTransferred( peer->upload, ret );
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tr_rcTransferred( tor->upload, ret );
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tor->uploadedCur += ret;
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peer->outTotal += ret;
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peer->outDate = tr_date();
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/* In case this block is done, you may have messages
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pending. Send them before we start the next block */
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goto writeBegin;
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}
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writeEnd:
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/* Ask for a block whenever possible */
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if( !tr_cpIsSeeding( tor->completion ) &&
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!peer->amInterested && tor->peerCount > TR_MAX_PEER_COUNT - 2 )
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{
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/* This peer is no use to us, and it seems there are
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more */
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peer_dbg( "not interesting" );
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return TR_ERROR;
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}
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if( peer->amInterested && !peer->peerChoking && !peer->banned )
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{
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int block;
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while( peer->inRequestCount < OUR_REQUEST_COUNT )
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{
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block = chooseBlock( tor, peer );
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if( block < 0 )
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{
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break;
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}
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sendRequest( tor, peer, block );
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}
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}
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return TR_OK;
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}
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/***********************************************************************
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* tr_peerIsConnected
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***********************************************************************
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*
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**********************************************************************/
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int tr_peerIsConnected( tr_peer_t * peer )
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{
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return PEER_STATUS_CONNECTED == peer->status;
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}
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/***********************************************************************
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* tr_peerIsIncoming
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***********************************************************************
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*
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**********************************************************************/
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int tr_peerIsFrom( tr_peer_t * peer )
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{
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return peer->from;
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}
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int tr_peerAmChoking( tr_peer_t * peer )
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{
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return peer->amChoking;
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}
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int tr_peerAmInterested( tr_peer_t * peer )
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{
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return peer->amInterested;
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}
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int tr_peerIsChoking( tr_peer_t * peer )
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{
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return peer->peerChoking;
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}
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int tr_peerIsInterested( tr_peer_t * peer )
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{
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return peer->peerInterested;
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}
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/***********************************************************************
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* tr_peerProgress
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***********************************************************************
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*
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**********************************************************************/
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float tr_peerProgress( tr_peer_t * peer )
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{
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return peer->progress;
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}
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/***********************************************************************
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* tr_peerPort
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***********************************************************************
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* Returns peer's listening port in host byte order
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**********************************************************************/
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int tr_peerPort( tr_peer_t * peer )
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{
|
|
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;
|
|
}
|