565 lines
14 KiB
C
565 lines
14 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2005-2006 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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/***********************************************************************
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* This file handles all incoming messages
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**********************************************************************/
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/***********************************************************************
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* parseChoke
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***********************************************************************
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*
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**********************************************************************/
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static inline int parseChoke( tr_torrent_t * tor, tr_peer_t * peer,
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int len, int choking )
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{
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tr_request_t * r;
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int i;
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if( len != 1 )
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{
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peer_dbg( "GET %schoke, invalid", choking ? "" : "un" );
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return 1;
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}
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peer_dbg( "GET %schoke", choking ? "" : "un" );
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peer->peerChoking = choking;
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if( choking )
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{
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/* Discard all pending requests */
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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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tr_cpDownloaderRem( tor->completion, tr_block(r->index,r->begin) );
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}
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peer->inRequestCount = 0;
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}
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return 0;
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}
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/***********************************************************************
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* parseInterested
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***********************************************************************
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*
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**********************************************************************/
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static inline int parseInterested( tr_peer_t * peer, int len,
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int interested )
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{
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if( len != 1 )
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{
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peer_dbg( "GET %sinterested, invalid", interested ? "" : "un" );
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return 1;
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}
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peer_dbg( "GET %sinterested", interested ? "" : "un" );
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peer->peerInterested = interested;
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return 0;
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}
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/***********************************************************************
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* parseHave
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***********************************************************************
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*
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**********************************************************************/
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static inline int parseHave( tr_torrent_t * tor, tr_peer_t * peer,
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uint8_t * p, int len )
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{
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uint32_t piece;
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if( len != 5 )
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{
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peer_dbg( "GET have, invalid" );
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return 1;
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}
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TR_NTOHL( p, piece );
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peer_dbg( "GET have %d", piece );
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if( !peer->bitfield )
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{
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peer->bitfield = calloc( ( tor->info.pieceCount + 7 ) / 8, 1 );
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}
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tr_bitfieldAdd( peer->bitfield, piece );
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updateInterest( tor, peer );
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return 0;
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}
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static inline int parseBitfield( tr_torrent_t * tor, tr_peer_t * peer,
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uint8_t * p, int len )
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{
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tr_info_t * inf = &tor->info;
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int bitfieldSize;
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bitfieldSize = ( inf->pieceCount + 7 ) / 8;
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if( len != 1 + bitfieldSize )
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{
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peer_dbg( "GET bitfield, wrong size" );
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return 1;
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}
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/* Make sure the spare bits are unset */
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if( ( inf->pieceCount & 0x7 ) )
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{
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uint8_t lastByte;
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lastByte = p[bitfieldSize-1];
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lastByte <<= inf->pieceCount & 0x7;
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lastByte &= 0xFF;
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if( lastByte )
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{
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peer_dbg( "GET bitfield, spare bits set" );
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return 1;
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}
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}
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peer_dbg( "GET bitfield, ok" );
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if( !peer->bitfield )
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{
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peer->bitfield = malloc( bitfieldSize );
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}
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memcpy( peer->bitfield, p, bitfieldSize );
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updateInterest( tor, peer );
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return 0;
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}
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static inline int parseRequest( tr_peer_t * peer, uint8_t * p, int len )
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{
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int index, begin, length;
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tr_request_t * r;
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if( len != 13 )
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{
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peer_dbg( "GET request, invalid" );
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return 1;
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}
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if( peer->amChoking )
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{
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/* Didn't he get it? */
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sendChoke( peer, 1 );
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return 0;
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}
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TR_NTOHL( p, index );
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TR_NTOHL( &p[4], begin );
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TR_NTOHL( &p[8], length );
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peer_dbg( "GET request %d/%d (%d bytes)",
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index, begin, length );
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/* TODO sanity checks (do we have the piece, etc) */
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if( length > 16384 )
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{
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/* Sorry mate */
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return 1;
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}
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if( peer->outRequestCount >= MAX_REQUEST_COUNT )
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{
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tr_err( "Too many requests" );
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return 1;
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}
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r = &peer->outRequests[peer->outRequestCount];
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r->index = index;
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r->begin = begin;
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r->length = length;
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(peer->outRequestCount)++;
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return 0;
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}
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static inline int parsePiece( tr_torrent_t * tor, tr_peer_t * peer,
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uint8_t * p, int len )
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{
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int index, begin, block, i, j;
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tr_request_t * r;
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TR_NTOHL( p, index );
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TR_NTOHL( &p[4], begin );
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peer_dbg( "GET piece %d/%d (%d bytes)",
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index, begin, len - 9 );
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if( peer->inRequestCount < 1 )
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{
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/* Our "cancel" was probably late */
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peer_dbg( "not expecting a block" );
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return 0;
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}
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r = &peer->inRequests[0];
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if( index != r->index || begin != r->begin )
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{
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int suckyClient;
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/* Either our "cancel" was late, or this is a sucky
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client that cannot deal with multiple requests */
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suckyClient = 0;
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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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if( index != r->index || begin != r->begin )
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{
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continue;
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}
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/* Sucky client, he dropped the previous requests */
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peer_dbg( "block was expected later" );
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for( j = 0; j < i; j++ )
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{
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r = &peer->inRequests[j];
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tr_cpDownloaderRem( tor->completion,
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tr_block(r->index,r->begin) );
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}
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suckyClient = 1;
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peer->inRequestCount -= i;
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memmove( &peer->inRequests[0], &peer->inRequests[i],
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peer->inRequestCount * sizeof( tr_request_t ) );
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r = &peer->inRequests[0];
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break;
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}
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if( !suckyClient )
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{
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r = &peer->inRequests[0];
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peer_dbg( "wrong block (expecting %d/%d)",
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r->index, r->begin );
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return 0;
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}
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}
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if( len - 9 != r->length )
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{
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peer_dbg( "wrong size (expecting %d)", r->length );
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return 1;
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}
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tor->downloaded += r->length;
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block = tr_block( r->index, r->begin );
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if( tr_cpBlockIsComplete( tor->completion, block ) )
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{
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peer_dbg( "have this block already" );
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(peer->inRequestCount)--;
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memmove( &peer->inRequests[0], &peer->inRequests[1],
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peer->inRequestCount * sizeof( tr_request_t ) );
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return 0;
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}
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/* set blame/credit for this piece */
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if( !peer->blamefield )
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{
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peer->blamefield = calloc( ( tor->info.pieceCount + 7 ) / 8, 1 );
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}
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tr_bitfieldAdd( peer->blamefield, index );
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tr_cpBlockAdd( tor->completion, block );
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tr_ioWrite( tor->io, index, begin, len - 9, &p[8] );
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tr_cpDownloaderRem( tor->completion, block );
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sendCancel( tor, block );
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if( tr_cpPieceIsComplete( tor->completion, index ) )
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{
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tr_peer_t * otherPeer;
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for( i = 0; i < tor->peerCount; i++ )
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{
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otherPeer = tor->peers[i];
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if( otherPeer->status < PEER_STATUS_CONNECTED )
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{
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continue;
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}
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sendHave( otherPeer, index );
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updateInterest( tor, otherPeer );
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}
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}
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(peer->inRequestCount)--;
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memmove( &peer->inRequests[0], &peer->inRequests[1],
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peer->inRequestCount * sizeof( tr_request_t ) );
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return 0;
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}
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static inline int parseCancel( tr_peer_t * peer, uint8_t * p, int len )
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{
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int index, begin, length;
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int i;
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tr_request_t * r;
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if( len != 13 )
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{
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peer_dbg( "GET cancel, invalid" );
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return 1;
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}
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TR_NTOHL( p, index );
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TR_NTOHL( &p[4], begin );
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TR_NTOHL( &p[8], length );
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peer_dbg( "GET cancel %d/%d (%d bytes)",
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index, begin, length );
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for( i = 0; i < peer->outRequestCount; i++ )
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{
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r = &peer->outRequests[i];
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if( r->index == index && r->begin == begin &&
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r->length == length )
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{
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(peer->outRequestCount)--;
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memmove( &r[0], &r[1], sizeof( tr_request_t ) *
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( peer->outRequestCount - i ) );
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break;
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}
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}
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return 0;
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}
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static inline int parsePort( tr_peer_t * peer, uint8_t * p, int len )
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{
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in_port_t port;
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if( len != 3 )
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{
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peer_dbg( "GET port, invalid" );
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return 1;
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}
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port = *( (in_port_t *) p );
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peer_dbg( "GET port %d", ntohs( port ) );
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return 0;
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}
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static inline int parseMessage( tr_torrent_t * tor, tr_peer_t * peer,
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uint8_t * p, int len )
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{
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char id;
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/* Type of the message */
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id = *(p++);
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switch( id )
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{
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case 0:
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return parseChoke( tor, peer, len, 1 );
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case 1:
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return parseChoke( tor, peer, len, 0 );
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case 2:
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return parseInterested( peer, len, 1 );
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case 3:
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return parseInterested( peer, len, 0 );
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case 4:
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return parseHave( tor, peer, p, len );
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case 5:
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return parseBitfield( tor, peer, p, len );
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case 6:
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return parseRequest( peer, p, len );
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case 7:
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return parsePiece( tor, peer, p, len );
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case 8:
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return parseCancel( peer, p, len );
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case 9:
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return parsePort( peer, p, len );
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}
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peer_dbg( "Unknown message '%d'", id );
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return 1;
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}
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static inline int parseBufHeader( tr_peer_t * peer )
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{
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uint8_t * p = peer->buf;
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if( 4 > peer->pos )
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{
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return 0;
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}
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if( p[0] != 19 || memcmp( &p[1], "Bit", 3 ) )
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{
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/* Don't wait until we get 68 bytes, this is wrong
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already */
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peer_dbg( "GET handshake, invalid" );
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tr_netSend( peer->socket, (uint8_t *) "Nice try...\r\n", 13 );
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return 1;
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}
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if( peer->pos < 68 )
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{
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return 0;
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}
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if( memcmp( &p[4], "Torrent protocol", 16 ) )
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{
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peer_dbg( "GET handshake, invalid" );
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return 1;
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}
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return 0;
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}
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static uint8_t * parseBufHash( tr_peer_t * peer )
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{
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if( 48 > peer->pos )
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{
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return NULL;
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}
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else
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{
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return peer->buf + 28;
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}
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}
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static inline int parseBuf( tr_torrent_t * tor, tr_peer_t * peer )
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{
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tr_info_t * inf = &tor->info;
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int i;
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int len;
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uint8_t * p = peer->buf;
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uint8_t * end = &p[peer->pos];
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if( peer->banned )
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{
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/* Don't even parse, we only stay connected */
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peer->pos = 0;
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return 0;
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}
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while( peer->pos >= 4 )
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{
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if( peer->status & PEER_STATUS_HANDSHAKE )
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{
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char * client;
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if( parseBufHeader( peer ) )
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{
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return 1;
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}
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if( peer->pos < 68 )
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{
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break;
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}
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if( memcmp( &p[28], inf->hash, 20 ) )
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{
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peer_dbg( "GET handshake, wrong torrent hash" );
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return 1;
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}
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if( !memcmp( &p[48], tor->id, 20 ) )
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{
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/* We are connected to ourselves... */
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peer_dbg( "GET handshake, that is us" );
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return 1;
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}
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peer->status = PEER_STATUS_CONNECTED;
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memcpy( peer->id, &p[48], 20 );
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p += 68;
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peer->pos -= 68;
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for( i = 0; i < tor->peerCount; i++ )
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{
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if( tor->peers[i] == peer )
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{
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continue;
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}
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if( !peerCmp( peer, tor->peers[i] ) )
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{
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peer_dbg( "GET handshake, duplicate" );
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return 1;
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}
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}
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client = tr_clientForId( (uint8_t *) peer->id );
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peer_dbg( "GET handshake, ok (%s)", client );
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free( client );
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sendBitfield( tor, peer );
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continue;
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}
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/* Get payload size */
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TR_NTOHL( p, len );
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p += 4;
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if( len > 9 + tor->blockSize )
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{
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/* This should never happen. Drop that peer */
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peer_dbg( "message too large (%d bytes)", len );
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return 1;
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}
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if( !len )
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{
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/* keep-alive */
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peer_dbg( "GET keep-alive" );
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peer->pos -= 4;
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continue;
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}
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if( &p[len] > end )
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{
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/* We do not have the entire message */
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p -= 4;
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break;
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}
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/* Remaining data after this message */
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peer->pos -= 4 + len;
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if( parseMessage( tor, peer, p, len ) )
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{
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return 1;
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}
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p += len;
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}
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memmove( peer->buf, p, peer->pos );
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return 0;
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}
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