mirror of
https://github.com/transmission/transmission
synced 2024-12-27 10:07:40 +00:00
2418 lines
71 KiB
C
2418 lines
71 KiB
C
/*
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* This file Copyright (C) 2007-2010 Mnemosyne LLC
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#include <assert.h>
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#include <errno.h>
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#include <limits.h> /* INT_MAX */
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <event.h>
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#include "transmission.h"
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#include "bencode.h"
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#include "completion.h"
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#include "crypto.h"
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#include "inout.h"
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#ifdef WIN32
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#include "net.h" /* for ECONN */
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#endif
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#include "peer-io.h"
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#include "peer-mgr.h"
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#include "peer-msgs.h"
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#include "session.h"
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#include "stats.h"
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#include "torrent.h"
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#include "torrent-magnet.h"
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#include "tr-dht.h"
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#include "utils.h"
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#include "version.h"
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/**
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***
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**/
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enum
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{
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BT_CHOKE = 0,
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BT_UNCHOKE = 1,
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BT_INTERESTED = 2,
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BT_NOT_INTERESTED = 3,
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BT_HAVE = 4,
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BT_BITFIELD = 5,
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BT_REQUEST = 6,
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BT_PIECE = 7,
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BT_CANCEL = 8,
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BT_PORT = 9,
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BT_FEXT_SUGGEST = 13,
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BT_FEXT_HAVE_ALL = 14,
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BT_FEXT_HAVE_NONE = 15,
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BT_FEXT_REJECT = 16,
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BT_FEXT_ALLOWED_FAST = 17,
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BT_LTEP = 20,
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LTEP_HANDSHAKE = 0,
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UT_PEX_ID = 1,
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UT_METADATA_ID = 3,
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MAX_PEX_PEER_COUNT = 50,
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MIN_CHOKE_PERIOD_SEC = 10,
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/* idle seconds before we send a keepalive */
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KEEPALIVE_INTERVAL_SECS = 100,
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PEX_INTERVAL_SECS = 90, /* sec between sendPex() calls */
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REQQ = 512,
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METADATA_REQQ = 64,
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MAX_BLOCK_SIZE = ( 1024 * 16 ),
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/* used in lowering the outMessages queue period */
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IMMEDIATE_PRIORITY_INTERVAL_SECS = 0,
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HIGH_PRIORITY_INTERVAL_SECS = 2,
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LOW_PRIORITY_INTERVAL_SECS = 10,
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/* number of pieces to remove from the bitfield when
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* lazy bitfields are turned on */
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LAZY_PIECE_COUNT = 26,
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/* number of pieces we'll allow in our fast set */
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MAX_FAST_SET_SIZE = 3,
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/* defined in BEP #9 */
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METADATA_MSG_TYPE_REQUEST = 0,
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METADATA_MSG_TYPE_DATA = 1,
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METADATA_MSG_TYPE_REJECT = 2
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};
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enum
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{
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AWAITING_BT_LENGTH,
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AWAITING_BT_ID,
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AWAITING_BT_MESSAGE,
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AWAITING_BT_PIECE
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};
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/**
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***
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**/
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struct peer_request
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{
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uint32_t index;
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uint32_t offset;
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uint32_t length;
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};
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static uint32_t
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getBlockOffsetInPiece( const tr_torrent * tor, uint64_t b )
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{
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const uint64_t piecePos = tor->info.pieceSize * tr_torBlockPiece( tor, b );
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const uint64_t blockPos = tor->blockSize * b;
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assert( blockPos >= piecePos );
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return (uint32_t)( blockPos - piecePos );
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}
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static void
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blockToReq( const tr_torrent * tor,
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tr_block_index_t block,
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struct peer_request * setme )
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{
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assert( setme != NULL );
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setme->index = tr_torBlockPiece( tor, block );
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setme->offset = getBlockOffsetInPiece( tor, block );
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setme->length = tr_torBlockCountBytes( tor, block );
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}
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/**
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***
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**/
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/* this is raw, unchanged data from the peer regarding
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* the current message that it's sending us. */
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struct tr_incoming
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{
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uint8_t id;
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uint32_t length; /* includes the +1 for id length */
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struct peer_request blockReq; /* metadata for incoming blocks */
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struct evbuffer * block; /* piece data for incoming blocks */
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};
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/**
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* Low-level communication state information about a connected peer.
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*
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* This structure remembers the low-level protocol states that we're
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* in with this peer, such as active requests, pex messages, and so on.
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* Its fields are all private to peer-msgs.c.
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*
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* Data not directly involved with sending & receiving messages is
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* stored in tr_peer, where it can be accessed by both peermsgs and
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* the peer manager.
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*
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* @see struct peer_atom
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* @see tr_peer
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*/
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struct tr_peermsgs
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{
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tr_bool peerSupportsPex;
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tr_bool peerSupportsMetadataXfer;
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tr_bool clientSentLtepHandshake;
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tr_bool peerSentLtepHandshake;
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/*tr_bool haveFastSet;*/
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int desiredRequestCount;
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int prefetchCount;
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/* how long the outMessages batch should be allowed to grow before
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* it's flushed -- some messages (like requests >:) should be sent
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* very quickly; others aren't as urgent. */
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int8_t outMessagesBatchPeriod;
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uint8_t state;
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uint8_t ut_pex_id;
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uint8_t ut_metadata_id;
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uint16_t pexCount;
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uint16_t pexCount6;
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#if 0
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size_t fastsetSize;
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tr_piece_index_t fastset[MAX_FAST_SET_SIZE];
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#endif
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tr_peer * peer;
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tr_torrent * torrent;
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tr_publisher publisher;
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struct evbuffer * outMessages; /* all the non-piece messages */
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struct peer_request peerAskedFor[REQQ];
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int peerAskedForMetadata[METADATA_REQQ];
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int peerAskedForMetadataCount;
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tr_pex * pex;
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tr_pex * pex6;
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/*time_t clientSentPexAt;*/
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time_t clientSentAnythingAt;
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/* when we started batching the outMessages */
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time_t outMessagesBatchedAt;
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struct tr_incoming incoming;
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/* if the peer supports the Extension Protocol in BEP 10 and
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supplied a reqq argument, it's stored here. otherwise the
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value is zero and should be ignored. */
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int64_t reqq;
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struct event pexTimer;
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};
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/**
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***
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**/
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#if 0
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static tr_bitfield*
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getHave( const struct tr_peermsgs * msgs )
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{
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if( msgs->peer->have == NULL )
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msgs->peer->have = tr_bitfieldNew( msgs->torrent->info.pieceCount );
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return msgs->peer->have;
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}
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#endif
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static inline tr_session*
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getSession( struct tr_peermsgs * msgs )
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{
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return msgs->torrent->session;
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}
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/**
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***
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**/
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static void
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myDebug( const char * file, int line,
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const struct tr_peermsgs * msgs,
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const char * fmt, ... )
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{
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FILE * fp = tr_getLog( );
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if( fp )
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{
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va_list args;
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char timestr[64];
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struct evbuffer * buf = evbuffer_new( );
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char * base = tr_basename( file );
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evbuffer_add_printf( buf, "[%s] %s - %s [%s]: ",
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tr_getLogTimeStr( timestr, sizeof( timestr ) ),
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tr_torrentName( msgs->torrent ),
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tr_peerIoGetAddrStr( msgs->peer->io ),
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msgs->peer->client );
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va_start( args, fmt );
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evbuffer_add_vprintf( buf, fmt, args );
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va_end( args );
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evbuffer_add_printf( buf, " (%s:%d)\n", base, line );
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/* FIXME(libevent2) tr_getLog() should return an fd, then use evbuffer_write() here */
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fwrite( EVBUFFER_DATA( buf ), 1, EVBUFFER_LENGTH( buf ), fp );
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tr_free( base );
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evbuffer_free( buf );
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}
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}
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#define dbgmsg( msgs, ... ) \
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do { \
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if( tr_deepLoggingIsActive( ) ) \
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myDebug( __FILE__, __LINE__, msgs, __VA_ARGS__ ); \
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} while( 0 )
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/**
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***
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**/
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static void
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pokeBatchPeriod( tr_peermsgs * msgs,
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int interval )
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{
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if( msgs->outMessagesBatchPeriod > interval )
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{
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msgs->outMessagesBatchPeriod = interval;
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dbgmsg( msgs, "lowering batch interval to %d seconds", interval );
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}
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}
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static inline void
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dbgOutMessageLen( tr_peermsgs * msgs )
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{
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dbgmsg( msgs, "outMessage size is now %zu", EVBUFFER_LENGTH( msgs->outMessages ) );
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}
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static void
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protocolSendReject( tr_peermsgs * msgs, const struct peer_request * req )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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assert( tr_peerIoSupportsFEXT( msgs->peer->io ) );
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tr_peerIoWriteUint32( io, out, sizeof( uint8_t ) + 3 * sizeof( uint32_t ) );
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tr_peerIoWriteUint8 ( io, out, BT_FEXT_REJECT );
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tr_peerIoWriteUint32( io, out, req->index );
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tr_peerIoWriteUint32( io, out, req->offset );
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tr_peerIoWriteUint32( io, out, req->length );
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dbgmsg( msgs, "rejecting %u:%u->%u...", req->index, req->offset, req->length );
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dbgOutMessageLen( msgs );
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}
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static void
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protocolSendRequest( tr_peermsgs * msgs,
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const struct peer_request * req )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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tr_peerIoWriteUint32( io, out, sizeof( uint8_t ) + 3 * sizeof( uint32_t ) );
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tr_peerIoWriteUint8 ( io, out, BT_REQUEST );
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tr_peerIoWriteUint32( io, out, req->index );
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tr_peerIoWriteUint32( io, out, req->offset );
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tr_peerIoWriteUint32( io, out, req->length );
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dbgmsg( msgs, "requesting %u:%u->%u...", req->index, req->offset, req->length );
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dbgOutMessageLen( msgs );
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pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
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}
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static void
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protocolSendCancel( tr_peermsgs * msgs,
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const struct peer_request * req )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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tr_peerIoWriteUint32( io, out, sizeof( uint8_t ) + 3 * sizeof( uint32_t ) );
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tr_peerIoWriteUint8 ( io, out, BT_CANCEL );
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tr_peerIoWriteUint32( io, out, req->index );
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tr_peerIoWriteUint32( io, out, req->offset );
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tr_peerIoWriteUint32( io, out, req->length );
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dbgmsg( msgs, "cancelling %u:%u->%u...", req->index, req->offset, req->length );
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dbgOutMessageLen( msgs );
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pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
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}
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static void
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protocolSendPort(tr_peermsgs *msgs, uint16_t port)
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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dbgmsg( msgs, "sending Port %u", port);
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tr_peerIoWriteUint32( io, out, 3 );
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tr_peerIoWriteUint8 ( io, out, BT_PORT );
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tr_peerIoWriteUint16( io, out, port);
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}
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static void
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protocolSendHave( tr_peermsgs * msgs,
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uint32_t index )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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tr_peerIoWriteUint32( io, out, sizeof(uint8_t) + sizeof(uint32_t) );
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tr_peerIoWriteUint8 ( io, out, BT_HAVE );
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tr_peerIoWriteUint32( io, out, index );
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dbgmsg( msgs, "sending Have %u", index );
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dbgOutMessageLen( msgs );
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pokeBatchPeriod( msgs, LOW_PRIORITY_INTERVAL_SECS );
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}
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#if 0
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static void
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protocolSendAllowedFast( tr_peermsgs * msgs, uint32_t pieceIndex )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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assert( tr_peerIoSupportsFEXT( msgs->peer->io ) );
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tr_peerIoWriteUint32( io, out, sizeof(uint8_t) + sizeof(uint32_t) );
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tr_peerIoWriteUint8 ( io, out, BT_FEXT_ALLOWED_FAST );
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tr_peerIoWriteUint32( io, out, pieceIndex );
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dbgmsg( msgs, "sending Allowed Fast %u...", pieceIndex );
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dbgOutMessageLen( msgs );
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}
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#endif
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static void
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protocolSendChoke( tr_peermsgs * msgs,
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int choke )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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tr_peerIoWriteUint32( io, out, sizeof( uint8_t ) );
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tr_peerIoWriteUint8 ( io, out, choke ? BT_CHOKE : BT_UNCHOKE );
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dbgmsg( msgs, "sending %s...", choke ? "Choke" : "Unchoke" );
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dbgOutMessageLen( msgs );
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pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
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}
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static void
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protocolSendHaveAll( tr_peermsgs * msgs )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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assert( tr_peerIoSupportsFEXT( msgs->peer->io ) );
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tr_peerIoWriteUint32( io, out, sizeof( uint8_t ) );
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tr_peerIoWriteUint8 ( io, out, BT_FEXT_HAVE_ALL );
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dbgmsg( msgs, "sending HAVE_ALL..." );
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dbgOutMessageLen( msgs );
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pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
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}
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static void
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protocolSendHaveNone( tr_peermsgs * msgs )
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{
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tr_peerIo * io = msgs->peer->io;
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struct evbuffer * out = msgs->outMessages;
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assert( tr_peerIoSupportsFEXT( msgs->peer->io ) );
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tr_peerIoWriteUint32( io, out, sizeof( uint8_t ) );
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tr_peerIoWriteUint8 ( io, out, BT_FEXT_HAVE_NONE );
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dbgmsg( msgs, "sending HAVE_NONE..." );
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dbgOutMessageLen( msgs );
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pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
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}
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/**
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*** EVENTS
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**/
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static const tr_peer_event blankEvent = { 0, 0, 0, 0, 0.0f, 0, 0, 0, 0 };
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static void
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publish( tr_peermsgs * msgs, tr_peer_event * e )
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{
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assert( msgs->peer );
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assert( msgs->peer->msgs == msgs );
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tr_publisherPublish( &msgs->publisher, msgs->peer, e );
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}
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static void
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fireError( tr_peermsgs * msgs, int err )
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{
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tr_peer_event e = blankEvent;
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e.eventType = TR_PEER_ERROR;
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e.err = err;
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publish( msgs, &e );
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}
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static void
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fireUploadOnly( tr_peermsgs * msgs, tr_bool uploadOnly )
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{
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tr_peer_event e = blankEvent;
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e.eventType = TR_PEER_UPLOAD_ONLY;
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e.uploadOnly = uploadOnly;
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publish( msgs, &e );
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}
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static void
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firePeerProgress( tr_peermsgs * msgs )
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{
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tr_peer_event e = blankEvent;
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e.eventType = TR_PEER_PEER_PROGRESS;
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e.progress = msgs->peer->progress;
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publish( msgs, &e );
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}
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static void
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fireGotBlock( tr_peermsgs * msgs, const struct peer_request * req )
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{
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tr_peer_event e = blankEvent;
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e.eventType = TR_PEER_CLIENT_GOT_BLOCK;
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e.pieceIndex = req->index;
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e.offset = req->offset;
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e.length = req->length;
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publish( msgs, &e );
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}
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static void
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fireGotRej( tr_peermsgs * msgs, const struct peer_request * req )
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{
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tr_peer_event e = blankEvent;
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e.eventType = TR_PEER_CLIENT_GOT_REJ;
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e.pieceIndex = req->index;
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e.offset = req->offset;
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e.length = req->length;
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publish( msgs, &e );
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}
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static void
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fireGotChoke( tr_peermsgs * msgs )
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{
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tr_peer_event e = blankEvent;
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|
e.eventType = TR_PEER_CLIENT_GOT_CHOKE;
|
|
publish( msgs, &e );
|
|
}
|
|
|
|
static void
|
|
fireClientGotData( tr_peermsgs * msgs,
|
|
uint32_t length,
|
|
int wasPieceData )
|
|
{
|
|
tr_peer_event e = blankEvent;
|
|
|
|
e.length = length;
|
|
e.eventType = TR_PEER_CLIENT_GOT_DATA;
|
|
e.wasPieceData = wasPieceData;
|
|
publish( msgs, &e );
|
|
}
|
|
|
|
static void
|
|
fireClientGotSuggest( tr_peermsgs * msgs, uint32_t pieceIndex )
|
|
{
|
|
tr_peer_event e = blankEvent;
|
|
e.eventType = TR_PEER_CLIENT_GOT_SUGGEST;
|
|
e.pieceIndex = pieceIndex;
|
|
publish( msgs, &e );
|
|
}
|
|
|
|
static void
|
|
fireClientGotPort( tr_peermsgs * msgs, tr_port port )
|
|
{
|
|
tr_peer_event e = blankEvent;
|
|
e.eventType = TR_PEER_CLIENT_GOT_PORT;
|
|
e.port = port;
|
|
publish( msgs, &e );
|
|
}
|
|
|
|
static void
|
|
fireClientGotAllowedFast( tr_peermsgs * msgs, uint32_t pieceIndex )
|
|
{
|
|
tr_peer_event e = blankEvent;
|
|
e.eventType = TR_PEER_CLIENT_GOT_ALLOWED_FAST;
|
|
e.pieceIndex = pieceIndex;
|
|
publish( msgs, &e );
|
|
}
|
|
|
|
static void
|
|
firePeerGotData( tr_peermsgs * msgs,
|
|
uint32_t length,
|
|
int wasPieceData )
|
|
{
|
|
tr_peer_event e = blankEvent;
|
|
|
|
e.length = length;
|
|
e.eventType = TR_PEER_PEER_GOT_DATA;
|
|
e.wasPieceData = wasPieceData;
|
|
|
|
publish( msgs, &e );
|
|
}
|
|
|
|
/**
|
|
*** ALLOWED FAST SET
|
|
*** For explanation, see http://www.bittorrent.org/beps/bep_0006.html
|
|
**/
|
|
|
|
size_t
|
|
tr_generateAllowedSet( tr_piece_index_t * setmePieces,
|
|
size_t desiredSetSize,
|
|
size_t pieceCount,
|
|
const uint8_t * infohash,
|
|
const tr_address * addr )
|
|
{
|
|
size_t setSize = 0;
|
|
|
|
assert( setmePieces );
|
|
assert( desiredSetSize <= pieceCount );
|
|
assert( desiredSetSize );
|
|
assert( pieceCount );
|
|
assert( infohash );
|
|
assert( addr );
|
|
|
|
if( addr->type == TR_AF_INET )
|
|
{
|
|
uint8_t w[SHA_DIGEST_LENGTH + 4], *walk=w;
|
|
uint8_t x[SHA_DIGEST_LENGTH];
|
|
|
|
uint32_t ui32 = ntohl( htonl( addr->addr.addr4.s_addr ) & 0xffffff00 ); /* (1) */
|
|
memcpy( w, &ui32, sizeof( uint32_t ) );
|
|
walk += sizeof( uint32_t );
|
|
memcpy( walk, infohash, SHA_DIGEST_LENGTH ); /* (2) */
|
|
walk += SHA_DIGEST_LENGTH;
|
|
tr_sha1( x, w, walk-w, NULL ); /* (3) */
|
|
assert( sizeof( w ) == walk-w );
|
|
|
|
while( setSize<desiredSetSize )
|
|
{
|
|
int i;
|
|
for( i=0; i<5 && setSize<desiredSetSize; ++i ) /* (4) */
|
|
{
|
|
size_t k;
|
|
uint32_t j = i * 4; /* (5) */
|
|
uint32_t y = ntohl( *( uint32_t* )( x + j ) ); /* (6) */
|
|
uint32_t index = y % pieceCount; /* (7) */
|
|
|
|
for( k=0; k<setSize; ++k ) /* (8) */
|
|
if( setmePieces[k] == index )
|
|
break;
|
|
|
|
if( k == setSize )
|
|
setmePieces[setSize++] = index; /* (9) */
|
|
}
|
|
|
|
tr_sha1( x, x, sizeof( x ), NULL ); /* (3) */
|
|
}
|
|
}
|
|
|
|
return setSize;
|
|
}
|
|
|
|
static void
|
|
updateFastSet( tr_peermsgs * msgs UNUSED )
|
|
{
|
|
#if 0
|
|
const tr_bool fext = tr_peerIoSupportsFEXT( msgs->peer->io );
|
|
const int peerIsNeedy = msgs->peer->progress < 0.10;
|
|
|
|
if( fext && peerIsNeedy && !msgs->haveFastSet )
|
|
{
|
|
size_t i;
|
|
const struct tr_address * addr = tr_peerIoGetAddress( msgs->peer->io, NULL );
|
|
const tr_info * inf = &msgs->torrent->info;
|
|
const size_t numwant = MIN( MAX_FAST_SET_SIZE, inf->pieceCount );
|
|
|
|
/* build the fast set */
|
|
msgs->fastsetSize = tr_generateAllowedSet( msgs->fastset, numwant, inf->pieceCount, inf->hash, addr );
|
|
msgs->haveFastSet = 1;
|
|
|
|
/* send it to the peer */
|
|
for( i=0; i<msgs->fastsetSize; ++i )
|
|
protocolSendAllowedFast( msgs, msgs->fastset[i] );
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
*** INTEREST
|
|
**/
|
|
|
|
static tr_bool
|
|
isPieceInteresting( const tr_peermsgs * msgs,
|
|
tr_piece_index_t piece )
|
|
{
|
|
const tr_torrent * torrent = msgs->torrent;
|
|
|
|
return ( !torrent->info.pieces[piece].dnd ) /* we want it */
|
|
&& ( !tr_cpPieceIsComplete( &torrent->completion, piece ) ) /* !have */
|
|
&& ( tr_bitsetHas( &msgs->peer->have, piece ) ); /* peer has it */
|
|
}
|
|
|
|
/* "interested" means we'll ask for piece data if they unchoke us */
|
|
static tr_bool
|
|
isPeerInteresting( const tr_peermsgs * msgs )
|
|
{
|
|
tr_piece_index_t i;
|
|
const tr_torrent * torrent;
|
|
const tr_bitfield * bitfield;
|
|
const int clientIsSeed = tr_torrentIsSeed( msgs->torrent );
|
|
|
|
if( clientIsSeed )
|
|
return FALSE;
|
|
|
|
if( !tr_torrentIsPieceTransferAllowed( msgs->torrent, TR_PEER_TO_CLIENT ) )
|
|
return FALSE;
|
|
|
|
torrent = msgs->torrent;
|
|
bitfield = tr_cpPieceBitfield( &torrent->completion );
|
|
|
|
for( i = 0; i < torrent->info.pieceCount; ++i )
|
|
if( isPieceInteresting( msgs, i ) )
|
|
return TRUE;
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static void
|
|
sendInterest( tr_peermsgs * msgs, tr_bool clientIsInterested )
|
|
{
|
|
struct evbuffer * out = msgs->outMessages;
|
|
|
|
assert( msgs );
|
|
assert( tr_isBool( clientIsInterested ) );
|
|
|
|
msgs->peer->clientIsInterested = clientIsInterested;
|
|
dbgmsg( msgs, "Sending %s", clientIsInterested ? "Interested" : "Not Interested" );
|
|
tr_peerIoWriteUint32( msgs->peer->io, out, sizeof( uint8_t ) );
|
|
tr_peerIoWriteUint8 ( msgs->peer->io, out, clientIsInterested ? BT_INTERESTED : BT_NOT_INTERESTED );
|
|
|
|
pokeBatchPeriod( msgs, HIGH_PRIORITY_INTERVAL_SECS );
|
|
dbgOutMessageLen( msgs );
|
|
}
|
|
|
|
static void
|
|
updateInterest( tr_peermsgs * msgs )
|
|
{
|
|
const int i = isPeerInteresting( msgs );
|
|
|
|
if( i != msgs->peer->clientIsInterested )
|
|
sendInterest( msgs, i );
|
|
}
|
|
|
|
static tr_bool
|
|
popNextMetadataRequest( tr_peermsgs * msgs, int * piece )
|
|
{
|
|
if( msgs->peerAskedForMetadataCount == 0 )
|
|
return FALSE;
|
|
|
|
*piece = msgs->peerAskedForMetadata[0];
|
|
|
|
tr_removeElementFromArray( msgs->peerAskedForMetadata, 0, sizeof( int ),
|
|
msgs->peerAskedForMetadataCount-- );
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static tr_bool
|
|
popNextRequest( tr_peermsgs * msgs, struct peer_request * setme )
|
|
{
|
|
if( msgs->peer->pendingReqsToClient == 0 )
|
|
return FALSE;
|
|
|
|
*setme = msgs->peerAskedFor[0];
|
|
|
|
tr_removeElementFromArray( msgs->peerAskedFor, 0, sizeof( struct peer_request ),
|
|
msgs->peer->pendingReqsToClient-- );
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
cancelAllRequestsToClient( tr_peermsgs * msgs )
|
|
{
|
|
struct peer_request req;
|
|
const int mustSendCancel = tr_peerIoSupportsFEXT( msgs->peer->io );
|
|
|
|
while( popNextRequest( msgs, &req ))
|
|
if( mustSendCancel )
|
|
protocolSendReject( msgs, &req );
|
|
}
|
|
|
|
void
|
|
tr_peerMsgsSetChoke( tr_peermsgs * msgs,
|
|
int choke )
|
|
{
|
|
const time_t now = tr_time( );
|
|
const time_t fibrillationTime = now - MIN_CHOKE_PERIOD_SEC;
|
|
|
|
assert( msgs );
|
|
assert( msgs->peer );
|
|
assert( choke == 0 || choke == 1 );
|
|
|
|
if( msgs->peer->chokeChangedAt > fibrillationTime )
|
|
{
|
|
dbgmsg( msgs, "Not changing choke to %d to avoid fibrillation", choke );
|
|
}
|
|
else if( msgs->peer->peerIsChoked != choke )
|
|
{
|
|
msgs->peer->peerIsChoked = choke;
|
|
if( choke )
|
|
cancelAllRequestsToClient( msgs );
|
|
protocolSendChoke( msgs, choke );
|
|
msgs->peer->chokeChangedAt = now;
|
|
}
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerMsgsHave( tr_peermsgs * msgs,
|
|
uint32_t index )
|
|
{
|
|
protocolSendHave( msgs, index );
|
|
|
|
/* since we have more pieces now, we might not be interested in this peer */
|
|
updateInterest( msgs );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static tr_bool
|
|
reqIsValid( const tr_peermsgs * peer,
|
|
uint32_t index,
|
|
uint32_t offset,
|
|
uint32_t length )
|
|
{
|
|
return tr_torrentReqIsValid( peer->torrent, index, offset, length );
|
|
}
|
|
|
|
static tr_bool
|
|
requestIsValid( const tr_peermsgs * msgs, const struct peer_request * req )
|
|
{
|
|
return reqIsValid( msgs, req->index, req->offset, req->length );
|
|
}
|
|
|
|
void
|
|
tr_peerMsgsCancel( tr_peermsgs * msgs, tr_block_index_t block )
|
|
{
|
|
struct peer_request req;
|
|
blockToReq( msgs->torrent, block, &req );
|
|
protocolSendCancel( msgs, &req );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static void
|
|
sendLtepHandshake( tr_peermsgs * msgs )
|
|
{
|
|
tr_benc val, *m;
|
|
char * buf;
|
|
int len;
|
|
tr_bool allow_pex;
|
|
tr_bool allow_metadata_xfer;
|
|
struct evbuffer * out = msgs->outMessages;
|
|
const unsigned char * ipv6 = tr_globalIPv6();
|
|
|
|
if( msgs->clientSentLtepHandshake )
|
|
return;
|
|
|
|
dbgmsg( msgs, "sending an ltep handshake" );
|
|
msgs->clientSentLtepHandshake = 1;
|
|
|
|
/* decide if we want to advertise metadata xfer support (BEP 9) */
|
|
if( tr_torrentIsPrivate( msgs->torrent ) )
|
|
allow_metadata_xfer = 0;
|
|
else
|
|
allow_metadata_xfer = 1;
|
|
|
|
/* decide if we want to advertise pex support */
|
|
if( !tr_torrentAllowsPex( msgs->torrent ) )
|
|
allow_pex = 0;
|
|
else if( msgs->peerSentLtepHandshake )
|
|
allow_pex = msgs->peerSupportsPex ? 1 : 0;
|
|
else
|
|
allow_pex = 1;
|
|
|
|
tr_bencInitDict( &val, 8 );
|
|
tr_bencDictAddInt( &val, "e", getSession(msgs)->encryptionMode != TR_CLEAR_PREFERRED );
|
|
if( ipv6 != NULL )
|
|
tr_bencDictAddRaw( &val, "ipv6", ipv6, 16 );
|
|
if( allow_metadata_xfer && tr_torrentHasMetadata( msgs->torrent )
|
|
&& ( msgs->torrent->infoDictLength > 0 ) )
|
|
tr_bencDictAddInt( &val, "metadata_size", msgs->torrent->infoDictLength );
|
|
tr_bencDictAddInt( &val, "p", tr_sessionGetPeerPort( getSession(msgs) ) );
|
|
tr_bencDictAddInt( &val, "reqq", REQQ );
|
|
tr_bencDictAddInt( &val, "upload_only", tr_torrentIsSeed( msgs->torrent ) );
|
|
tr_bencDictAddStr( &val, "v", TR_NAME " " USERAGENT_PREFIX );
|
|
m = tr_bencDictAddDict( &val, "m", 2 );
|
|
if( allow_metadata_xfer )
|
|
tr_bencDictAddInt( m, "ut_metadata", UT_METADATA_ID );
|
|
if( allow_pex )
|
|
tr_bencDictAddInt( m, "ut_pex", UT_PEX_ID );
|
|
|
|
buf = tr_bencToStr( &val, TR_FMT_BENC, &len );
|
|
|
|
tr_peerIoWriteUint32( msgs->peer->io, out, 2 * sizeof( uint8_t ) + len );
|
|
tr_peerIoWriteUint8 ( msgs->peer->io, out, BT_LTEP );
|
|
tr_peerIoWriteUint8 ( msgs->peer->io, out, LTEP_HANDSHAKE );
|
|
tr_peerIoWriteBytes ( msgs->peer->io, out, buf, len );
|
|
pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
|
|
dbgOutMessageLen( msgs );
|
|
|
|
/* cleanup */
|
|
tr_bencFree( &val );
|
|
tr_free( buf );
|
|
}
|
|
|
|
static void
|
|
parseLtepHandshake( tr_peermsgs * msgs,
|
|
int len,
|
|
struct evbuffer * inbuf )
|
|
{
|
|
int64_t i;
|
|
tr_benc val, * sub;
|
|
uint8_t * tmp = tr_new( uint8_t, len );
|
|
const uint8_t *addr;
|
|
size_t addr_len;
|
|
tr_pex pex;
|
|
|
|
memset( &pex, 0, sizeof( tr_pex ) );
|
|
|
|
tr_peerIoReadBytes( msgs->peer->io, inbuf, tmp, len );
|
|
msgs->peerSentLtepHandshake = 1;
|
|
|
|
if( tr_bencLoad( tmp, len, &val, NULL ) || !tr_bencIsDict( &val ) )
|
|
{
|
|
dbgmsg( msgs, "GET extended-handshake, couldn't get dictionary" );
|
|
tr_free( tmp );
|
|
return;
|
|
}
|
|
|
|
dbgmsg( msgs, "here is the handshake: [%*.*s]", len, len, tmp );
|
|
|
|
/* does the peer prefer encrypted connections? */
|
|
if( tr_bencDictFindInt( &val, "e", &i ) ) {
|
|
msgs->peer->encryption_preference = i ? ENCRYPTION_PREFERENCE_YES
|
|
: ENCRYPTION_PREFERENCE_NO;
|
|
if( i )
|
|
pex.flags |= ADDED_F_ENCRYPTION_FLAG;
|
|
}
|
|
|
|
/* check supported messages for utorrent pex */
|
|
msgs->peerSupportsPex = 0;
|
|
msgs->peerSupportsMetadataXfer = 0;
|
|
|
|
if( tr_bencDictFindDict( &val, "m", &sub ) ) {
|
|
if( tr_bencDictFindInt( sub, "ut_pex", &i ) ) {
|
|
msgs->peerSupportsPex = i != 0;
|
|
msgs->ut_pex_id = (uint8_t) i;
|
|
dbgmsg( msgs, "msgs->ut_pex is %d", (int)msgs->ut_pex_id );
|
|
}
|
|
if( tr_bencDictFindInt( sub, "ut_metadata", &i ) ) {
|
|
msgs->peerSupportsMetadataXfer = i != 0;
|
|
msgs->ut_metadata_id = (uint8_t) i;
|
|
dbgmsg( msgs, "msgs->ut_metadata_id is %d", (int)msgs->ut_metadata_id );
|
|
}
|
|
}
|
|
|
|
/* look for metainfo size (BEP 9) */
|
|
if( tr_bencDictFindInt( &val, "metadata_size", &i ) )
|
|
tr_torrentSetMetadataSizeHint( msgs->torrent, i );
|
|
|
|
/* look for upload_only (BEP 21) */
|
|
if( tr_bencDictFindInt( &val, "upload_only", &i ) ) {
|
|
fireUploadOnly( msgs, i!=0 );
|
|
if( i )
|
|
pex.flags |= ADDED_F_SEED_FLAG;
|
|
}
|
|
|
|
/* get peer's listening port */
|
|
if( tr_bencDictFindInt( &val, "p", &i ) ) {
|
|
pex.port = htons( (uint16_t)i );
|
|
fireClientGotPort( msgs, pex.port );
|
|
dbgmsg( msgs, "peer's port is now %d", (int)i );
|
|
}
|
|
|
|
if( tr_peerIoIsIncoming( msgs->peer->io )
|
|
&& tr_bencDictFindRaw( &val, "ipv4", &addr, &addr_len )
|
|
&& ( addr_len == 4 ) )
|
|
{
|
|
pex.addr.type = TR_AF_INET;
|
|
memcpy( &pex.addr.addr.addr4, addr, 4 );
|
|
tr_peerMgrAddPex( msgs->torrent, TR_PEER_FROM_LTEP, &pex );
|
|
}
|
|
|
|
if( tr_peerIoIsIncoming( msgs->peer->io )
|
|
&& tr_bencDictFindRaw( &val, "ipv6", &addr, &addr_len )
|
|
&& ( addr_len == 16 ) )
|
|
{
|
|
pex.addr.type = TR_AF_INET6;
|
|
memcpy( &pex.addr.addr.addr6, addr, 16 );
|
|
tr_peerMgrAddPex( msgs->torrent, TR_PEER_FROM_LTEP, &pex );
|
|
}
|
|
|
|
/* get peer's maximum request queue size */
|
|
if( tr_bencDictFindInt( &val, "reqq", &i ) )
|
|
msgs->reqq = i;
|
|
|
|
tr_bencFree( &val );
|
|
tr_free( tmp );
|
|
}
|
|
|
|
static void
|
|
parseUtMetadata( tr_peermsgs * msgs, int msglen, struct evbuffer * inbuf )
|
|
{
|
|
tr_benc dict;
|
|
char * msg_end;
|
|
char * benc_end;
|
|
int64_t msg_type = -1;
|
|
int64_t piece = -1;
|
|
int64_t total_size = 0;
|
|
uint8_t * tmp = tr_new( uint8_t, msglen );
|
|
|
|
tr_peerIoReadBytes( msgs->peer->io, inbuf, tmp, msglen );
|
|
msg_end = (char*)tmp + msglen;
|
|
|
|
if( !tr_bencLoad( tmp, msglen, &dict, &benc_end ) )
|
|
{
|
|
tr_bencDictFindInt( &dict, "msg_type", &msg_type );
|
|
tr_bencDictFindInt( &dict, "piece", &piece );
|
|
tr_bencDictFindInt( &dict, "total_size", &total_size );
|
|
tr_bencFree( &dict );
|
|
}
|
|
|
|
dbgmsg( msgs, "got ut_metadata msg: type %d, piece %d, total_size %d",
|
|
(int)msg_type, (int)piece, (int)total_size );
|
|
|
|
if( msg_type == METADATA_MSG_TYPE_REJECT )
|
|
{
|
|
/* NOOP */
|
|
}
|
|
|
|
if( ( msg_type == METADATA_MSG_TYPE_DATA )
|
|
&& ( !tr_torrentHasMetadata( msgs->torrent ) )
|
|
&& ( msg_end - benc_end <= METADATA_PIECE_SIZE )
|
|
&& ( piece * METADATA_PIECE_SIZE + (msg_end - benc_end) <= total_size ) )
|
|
{
|
|
const int pieceLen = msg_end - benc_end;
|
|
tr_torrentSetMetadataPiece( msgs->torrent, piece, benc_end, pieceLen );
|
|
}
|
|
|
|
if( msg_type == METADATA_MSG_TYPE_REQUEST )
|
|
{
|
|
if( ( piece >= 0 )
|
|
&& tr_torrentHasMetadata( msgs->torrent )
|
|
&& !tr_torrentIsPrivate( msgs->torrent )
|
|
&& ( msgs->peerAskedForMetadataCount < METADATA_REQQ ) )
|
|
{
|
|
msgs->peerAskedForMetadata[msgs->peerAskedForMetadataCount++] = piece;
|
|
}
|
|
else
|
|
{
|
|
tr_benc tmp;
|
|
int payloadLen;
|
|
char * payload;
|
|
tr_peerIo * io = msgs->peer->io;
|
|
struct evbuffer * out = msgs->outMessages;
|
|
|
|
/* build the rejection message */
|
|
tr_bencInitDict( &tmp, 2 );
|
|
tr_bencDictAddInt( &tmp, "msg_type", METADATA_MSG_TYPE_REJECT );
|
|
tr_bencDictAddInt( &tmp, "piece", piece );
|
|
payload = tr_bencToStr( &tmp, TR_FMT_BENC, &payloadLen );
|
|
tr_bencFree( &tmp );
|
|
|
|
/* write it out as a LTEP message to our outMessages buffer */
|
|
tr_peerIoWriteUint32( io, out, 2 * sizeof( uint8_t ) + payloadLen );
|
|
tr_peerIoWriteUint8 ( io, out, BT_LTEP );
|
|
tr_peerIoWriteUint8 ( io, out, msgs->ut_metadata_id );
|
|
tr_peerIoWriteBytes ( io, out, payload, payloadLen );
|
|
pokeBatchPeriod( msgs, HIGH_PRIORITY_INTERVAL_SECS );
|
|
dbgOutMessageLen( msgs );
|
|
|
|
tr_free( payload );
|
|
}
|
|
}
|
|
|
|
tr_free( tmp );
|
|
}
|
|
|
|
static void
|
|
parseUtPex( tr_peermsgs * msgs, int msglen, struct evbuffer * inbuf )
|
|
{
|
|
int loaded = 0;
|
|
uint8_t * tmp = tr_new( uint8_t, msglen );
|
|
tr_benc val;
|
|
tr_torrent * tor = msgs->torrent;
|
|
const uint8_t * added;
|
|
size_t added_len;
|
|
|
|
tr_peerIoReadBytes( msgs->peer->io, inbuf, tmp, msglen );
|
|
|
|
if( tr_torrentAllowsPex( tor )
|
|
&& ( ( loaded = !tr_bencLoad( tmp, msglen, &val, NULL ) ) ) )
|
|
{
|
|
if( tr_bencDictFindRaw( &val, "added", &added, &added_len ) )
|
|
{
|
|
tr_pex * pex;
|
|
size_t i, n;
|
|
size_t added_f_len = 0;
|
|
const uint8_t * added_f = NULL;
|
|
|
|
tr_bencDictFindRaw( &val, "added.f", &added_f, &added_f_len );
|
|
pex = tr_peerMgrCompactToPex( added, added_len, added_f, added_f_len, &n );
|
|
|
|
n = MIN( n, MAX_PEX_PEER_COUNT );
|
|
for( i=0; i<n; ++i )
|
|
tr_peerMgrAddPex( tor, TR_PEER_FROM_PEX, pex + i );
|
|
|
|
tr_free( pex );
|
|
}
|
|
|
|
if( tr_bencDictFindRaw( &val, "added6", &added, &added_len ) )
|
|
{
|
|
tr_pex * pex;
|
|
size_t i, n;
|
|
size_t added_f_len = 0;
|
|
const uint8_t * added_f = NULL;
|
|
|
|
tr_bencDictFindRaw( &val, "added6.f", &added_f, &added_f_len );
|
|
pex = tr_peerMgrCompact6ToPex( added, added_len, added_f, added_f_len, &n );
|
|
|
|
n = MIN( n, MAX_PEX_PEER_COUNT );
|
|
for( i=0; i<n; ++i )
|
|
tr_peerMgrAddPex( tor, TR_PEER_FROM_PEX, pex + i );
|
|
|
|
tr_free( pex );
|
|
}
|
|
}
|
|
|
|
if( loaded )
|
|
tr_bencFree( &val );
|
|
tr_free( tmp );
|
|
}
|
|
|
|
static void sendPex( tr_peermsgs * msgs );
|
|
|
|
static void
|
|
parseLtep( tr_peermsgs * msgs, int msglen, struct evbuffer * inbuf )
|
|
{
|
|
uint8_t ltep_msgid;
|
|
|
|
tr_peerIoReadUint8( msgs->peer->io, inbuf, <ep_msgid );
|
|
msglen--;
|
|
|
|
if( ltep_msgid == LTEP_HANDSHAKE )
|
|
{
|
|
dbgmsg( msgs, "got ltep handshake" );
|
|
parseLtepHandshake( msgs, msglen, inbuf );
|
|
if( tr_peerIoSupportsLTEP( msgs->peer->io ) )
|
|
{
|
|
sendLtepHandshake( msgs );
|
|
sendPex( msgs );
|
|
}
|
|
}
|
|
else if( ltep_msgid == UT_PEX_ID )
|
|
{
|
|
dbgmsg( msgs, "got ut pex" );
|
|
msgs->peerSupportsPex = 1;
|
|
parseUtPex( msgs, msglen, inbuf );
|
|
}
|
|
else if( ltep_msgid == UT_METADATA_ID )
|
|
{
|
|
dbgmsg( msgs, "got ut metadata" );
|
|
msgs->peerSupportsMetadataXfer = 1;
|
|
parseUtMetadata( msgs, msglen, inbuf );
|
|
}
|
|
else
|
|
{
|
|
dbgmsg( msgs, "skipping unknown ltep message (%d)", (int)ltep_msgid );
|
|
evbuffer_drain( inbuf, msglen );
|
|
}
|
|
}
|
|
|
|
static int
|
|
readBtLength( tr_peermsgs * msgs,
|
|
struct evbuffer * inbuf,
|
|
size_t inlen )
|
|
{
|
|
uint32_t len;
|
|
|
|
if( inlen < sizeof( len ) )
|
|
return READ_LATER;
|
|
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &len );
|
|
|
|
if( len == 0 ) /* peer sent us a keepalive message */
|
|
dbgmsg( msgs, "got KeepAlive" );
|
|
else
|
|
{
|
|
msgs->incoming.length = len;
|
|
msgs->state = AWAITING_BT_ID;
|
|
}
|
|
|
|
return READ_NOW;
|
|
}
|
|
|
|
static int readBtMessage( tr_peermsgs * msgs,
|
|
struct evbuffer * inbuf,
|
|
size_t inlen );
|
|
|
|
static int
|
|
readBtId( tr_peermsgs * msgs, struct evbuffer * inbuf, size_t inlen )
|
|
{
|
|
uint8_t id;
|
|
|
|
if( inlen < sizeof( uint8_t ) )
|
|
return READ_LATER;
|
|
|
|
tr_peerIoReadUint8( msgs->peer->io, inbuf, &id );
|
|
msgs->incoming.id = id;
|
|
dbgmsg( msgs, "msgs->incoming.id is now %d; msgs->incoming.length is %zu", id, (size_t)msgs->incoming.length );
|
|
|
|
if( id == BT_PIECE )
|
|
{
|
|
msgs->state = AWAITING_BT_PIECE;
|
|
return READ_NOW;
|
|
}
|
|
else if( msgs->incoming.length != 1 )
|
|
{
|
|
msgs->state = AWAITING_BT_MESSAGE;
|
|
return READ_NOW;
|
|
}
|
|
else return readBtMessage( msgs, inbuf, inlen - 1 );
|
|
}
|
|
|
|
static void
|
|
updatePeerProgress( tr_peermsgs * msgs )
|
|
{
|
|
msgs->peer->progress = tr_bitsetPercent( &msgs->peer->have );
|
|
dbgmsg( msgs, "peer progress is %f", msgs->peer->progress );
|
|
updateFastSet( msgs );
|
|
updateInterest( msgs );
|
|
firePeerProgress( msgs );
|
|
}
|
|
|
|
static void
|
|
peerMadeRequest( tr_peermsgs * msgs,
|
|
const struct peer_request * req )
|
|
{
|
|
const tr_bool fext = tr_peerIoSupportsFEXT( msgs->peer->io );
|
|
const int reqIsValid = requestIsValid( msgs, req );
|
|
const int clientHasPiece = reqIsValid && tr_cpPieceIsComplete( &msgs->torrent->completion, req->index );
|
|
const int peerIsChoked = msgs->peer->peerIsChoked;
|
|
|
|
int allow = FALSE;
|
|
|
|
if( !reqIsValid )
|
|
dbgmsg( msgs, "rejecting an invalid request." );
|
|
else if( !clientHasPiece )
|
|
dbgmsg( msgs, "rejecting request for a piece we don't have." );
|
|
else if( peerIsChoked )
|
|
dbgmsg( msgs, "rejecting request from choked peer" );
|
|
else if( msgs->peer->pendingReqsToClient + 1 >= REQQ )
|
|
dbgmsg( msgs, "rejecting request ... reqq is full" );
|
|
else
|
|
allow = TRUE;
|
|
|
|
if( allow )
|
|
msgs->peerAskedFor[msgs->peer->pendingReqsToClient++] = *req;
|
|
else if( fext )
|
|
protocolSendReject( msgs, req );
|
|
}
|
|
|
|
static tr_bool
|
|
messageLengthIsCorrect( const tr_peermsgs * msg, uint8_t id, uint32_t len )
|
|
{
|
|
switch( id )
|
|
{
|
|
case BT_CHOKE:
|
|
case BT_UNCHOKE:
|
|
case BT_INTERESTED:
|
|
case BT_NOT_INTERESTED:
|
|
case BT_FEXT_HAVE_ALL:
|
|
case BT_FEXT_HAVE_NONE:
|
|
return len == 1;
|
|
|
|
case BT_HAVE:
|
|
case BT_FEXT_SUGGEST:
|
|
case BT_FEXT_ALLOWED_FAST:
|
|
return len == 5;
|
|
|
|
case BT_BITFIELD:
|
|
return len == ( msg->torrent->info.pieceCount + 7u ) / 8u + 1u;
|
|
|
|
case BT_REQUEST:
|
|
case BT_CANCEL:
|
|
case BT_FEXT_REJECT:
|
|
return len == 13;
|
|
|
|
case BT_PIECE:
|
|
return len > 9 && len <= 16393;
|
|
|
|
case BT_PORT:
|
|
return len == 3;
|
|
|
|
case BT_LTEP:
|
|
return len >= 2;
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static int clientGotBlock( tr_peermsgs * msgs,
|
|
const uint8_t * block,
|
|
const struct peer_request * req );
|
|
|
|
static int
|
|
readBtPiece( tr_peermsgs * msgs,
|
|
struct evbuffer * inbuf,
|
|
size_t inlen,
|
|
size_t * setme_piece_bytes_read )
|
|
{
|
|
struct peer_request * req = &msgs->incoming.blockReq;
|
|
|
|
assert( EVBUFFER_LENGTH( inbuf ) >= inlen );
|
|
dbgmsg( msgs, "In readBtPiece" );
|
|
|
|
if( !req->length )
|
|
{
|
|
if( inlen < 8 )
|
|
return READ_LATER;
|
|
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &req->index );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &req->offset );
|
|
req->length = msgs->incoming.length - 9;
|
|
dbgmsg( msgs, "got incoming block header %u:%u->%u", req->index, req->offset, req->length );
|
|
return READ_NOW;
|
|
}
|
|
else
|
|
{
|
|
int err;
|
|
|
|
/* read in another chunk of data */
|
|
const size_t nLeft = req->length - EVBUFFER_LENGTH( msgs->incoming.block );
|
|
size_t n = MIN( nLeft, inlen );
|
|
size_t i = n;
|
|
void * buf = tr_sessionGetBuffer( getSession( msgs ) );
|
|
const size_t buflen = SESSION_BUFFER_SIZE;
|
|
|
|
while( i > 0 )
|
|
{
|
|
const size_t thisPass = MIN( i, buflen );
|
|
tr_peerIoReadBytes( msgs->peer->io, inbuf, buf, thisPass );
|
|
evbuffer_add( msgs->incoming.block, buf, thisPass );
|
|
i -= thisPass;
|
|
}
|
|
|
|
tr_sessionReleaseBuffer( getSession( msgs ) );
|
|
buf = NULL;
|
|
|
|
fireClientGotData( msgs, n, TRUE );
|
|
*setme_piece_bytes_read += n;
|
|
dbgmsg( msgs, "got %zu bytes for block %u:%u->%u ... %d remain",
|
|
n, req->index, req->offset, req->length,
|
|
(int)( req->length - EVBUFFER_LENGTH( msgs->incoming.block ) ) );
|
|
if( EVBUFFER_LENGTH( msgs->incoming.block ) < req->length )
|
|
return READ_LATER;
|
|
|
|
/* we've got the whole block ... process it */
|
|
err = clientGotBlock( msgs, EVBUFFER_DATA( msgs->incoming.block ), req );
|
|
|
|
/* cleanup */
|
|
evbuffer_free( msgs->incoming.block );
|
|
msgs->incoming.block = evbuffer_new( );
|
|
req->length = 0;
|
|
msgs->state = AWAITING_BT_LENGTH;
|
|
return err ? READ_ERR : READ_NOW;
|
|
}
|
|
}
|
|
|
|
static void updateDesiredRequestCount( tr_peermsgs * msgs, uint64_t now );
|
|
|
|
static int
|
|
readBtMessage( tr_peermsgs * msgs, struct evbuffer * inbuf, size_t inlen )
|
|
{
|
|
uint32_t ui32;
|
|
uint32_t msglen = msgs->incoming.length;
|
|
const uint8_t id = msgs->incoming.id;
|
|
#ifndef NDEBUG
|
|
const size_t startBufLen = EVBUFFER_LENGTH( inbuf );
|
|
#endif
|
|
const tr_bool fext = tr_peerIoSupportsFEXT( msgs->peer->io );
|
|
|
|
--msglen; /* id length */
|
|
|
|
dbgmsg( msgs, "got BT id %d, len %d, buffer size is %zu", (int)id, (int)msglen, inlen );
|
|
|
|
if( inlen < msglen )
|
|
return READ_LATER;
|
|
|
|
if( !messageLengthIsCorrect( msgs, id, msglen + 1 ) )
|
|
{
|
|
dbgmsg( msgs, "bad packet - BT message #%d with a length of %d", (int)id, (int)msglen );
|
|
fireError( msgs, EMSGSIZE );
|
|
return READ_ERR;
|
|
}
|
|
|
|
switch( id )
|
|
{
|
|
case BT_CHOKE:
|
|
dbgmsg( msgs, "got Choke" );
|
|
msgs->peer->clientIsChoked = 1;
|
|
if( !fext )
|
|
fireGotChoke( msgs );
|
|
break;
|
|
|
|
case BT_UNCHOKE:
|
|
dbgmsg( msgs, "got Unchoke" );
|
|
msgs->peer->clientIsChoked = 0;
|
|
updateDesiredRequestCount( msgs, tr_date( ) );
|
|
break;
|
|
|
|
case BT_INTERESTED:
|
|
dbgmsg( msgs, "got Interested" );
|
|
msgs->peer->peerIsInterested = 1;
|
|
break;
|
|
|
|
case BT_NOT_INTERESTED:
|
|
dbgmsg( msgs, "got Not Interested" );
|
|
msgs->peer->peerIsInterested = 0;
|
|
break;
|
|
|
|
case BT_HAVE:
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &ui32 );
|
|
dbgmsg( msgs, "got Have: %u", ui32 );
|
|
if( tr_torrentHasMetadata( msgs->torrent )
|
|
&& ( ui32 >= msgs->torrent->info.pieceCount ) )
|
|
{
|
|
fireError( msgs, ERANGE );
|
|
return READ_ERR;
|
|
}
|
|
if( tr_bitsetAdd( &msgs->peer->have, ui32 ) )
|
|
{
|
|
fireError( msgs, ERANGE );
|
|
return READ_ERR;
|
|
}
|
|
updatePeerProgress( msgs );
|
|
break;
|
|
|
|
case BT_BITFIELD: {
|
|
const size_t bitCount = tr_torrentHasMetadata( msgs->torrent )
|
|
? msgs->torrent->info.pieceCount
|
|
: msglen * 8;
|
|
dbgmsg( msgs, "got a bitfield" );
|
|
tr_bitsetReserve( &msgs->peer->have, bitCount );
|
|
tr_peerIoReadBytes( msgs->peer->io, inbuf,
|
|
msgs->peer->have.bitfield.bits, msglen );
|
|
updatePeerProgress( msgs );
|
|
break;
|
|
}
|
|
|
|
case BT_REQUEST:
|
|
{
|
|
struct peer_request r;
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.index );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.offset );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.length );
|
|
dbgmsg( msgs, "got Request: %u:%u->%u", r.index, r.offset, r.length );
|
|
peerMadeRequest( msgs, &r );
|
|
break;
|
|
}
|
|
|
|
case BT_CANCEL:
|
|
{
|
|
int i;
|
|
struct peer_request r;
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.index );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.offset );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.length );
|
|
dbgmsg( msgs, "got a Cancel %u:%u->%u", r.index, r.offset, r.length );
|
|
|
|
for( i=0; i<msgs->peer->pendingReqsToClient; ++i ) {
|
|
const struct peer_request * req = msgs->peerAskedFor + i;
|
|
if( ( req->index == r.index ) && ( req->offset == r.offset ) && ( req->length == r.length ) )
|
|
break;
|
|
}
|
|
|
|
if( i < msgs->peer->pendingReqsToClient )
|
|
tr_removeElementFromArray( msgs->peerAskedFor, i, sizeof( struct peer_request ),
|
|
msgs->peer->pendingReqsToClient-- );
|
|
break;
|
|
}
|
|
|
|
case BT_PIECE:
|
|
assert( 0 ); /* handled elsewhere! */
|
|
break;
|
|
|
|
case BT_PORT:
|
|
dbgmsg( msgs, "Got a BT_PORT" );
|
|
tr_peerIoReadUint16( msgs->peer->io, inbuf, &msgs->peer->dht_port );
|
|
if( msgs->peer->dht_port > 0 )
|
|
tr_dhtAddNode( getSession(msgs),
|
|
tr_peerAddress( msgs->peer ),
|
|
msgs->peer->dht_port, 0 );
|
|
break;
|
|
|
|
case BT_FEXT_SUGGEST:
|
|
dbgmsg( msgs, "Got a BT_FEXT_SUGGEST" );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &ui32 );
|
|
if( fext )
|
|
fireClientGotSuggest( msgs, ui32 );
|
|
else {
|
|
fireError( msgs, EMSGSIZE );
|
|
return READ_ERR;
|
|
}
|
|
break;
|
|
|
|
case BT_FEXT_ALLOWED_FAST:
|
|
dbgmsg( msgs, "Got a BT_FEXT_ALLOWED_FAST" );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &ui32 );
|
|
if( fext )
|
|
fireClientGotAllowedFast( msgs, ui32 );
|
|
else {
|
|
fireError( msgs, EMSGSIZE );
|
|
return READ_ERR;
|
|
}
|
|
break;
|
|
|
|
case BT_FEXT_HAVE_ALL:
|
|
dbgmsg( msgs, "Got a BT_FEXT_HAVE_ALL" );
|
|
if( fext ) {
|
|
tr_bitsetSetHaveAll( &msgs->peer->have );
|
|
updatePeerProgress( msgs );
|
|
} else {
|
|
fireError( msgs, EMSGSIZE );
|
|
return READ_ERR;
|
|
}
|
|
break;
|
|
|
|
case BT_FEXT_HAVE_NONE:
|
|
dbgmsg( msgs, "Got a BT_FEXT_HAVE_NONE" );
|
|
if( fext ) {
|
|
tr_bitsetSetHaveNone( &msgs->peer->have );
|
|
updatePeerProgress( msgs );
|
|
} else {
|
|
fireError( msgs, EMSGSIZE );
|
|
return READ_ERR;
|
|
}
|
|
break;
|
|
|
|
case BT_FEXT_REJECT:
|
|
{
|
|
struct peer_request r;
|
|
dbgmsg( msgs, "Got a BT_FEXT_REJECT" );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.index );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.offset );
|
|
tr_peerIoReadUint32( msgs->peer->io, inbuf, &r.length );
|
|
if( fext )
|
|
fireGotRej( msgs, &r );
|
|
else {
|
|
fireError( msgs, EMSGSIZE );
|
|
return READ_ERR;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case BT_LTEP:
|
|
dbgmsg( msgs, "Got a BT_LTEP" );
|
|
parseLtep( msgs, msglen, inbuf );
|
|
break;
|
|
|
|
default:
|
|
dbgmsg( msgs, "peer sent us an UNKNOWN: %d", (int)id );
|
|
tr_peerIoDrain( msgs->peer->io, inbuf, msglen );
|
|
break;
|
|
}
|
|
|
|
assert( msglen + 1 == msgs->incoming.length );
|
|
assert( EVBUFFER_LENGTH( inbuf ) == startBufLen - msglen );
|
|
|
|
msgs->state = AWAITING_BT_LENGTH;
|
|
return READ_NOW;
|
|
}
|
|
|
|
static void
|
|
addPeerToBlamefield( tr_peermsgs * msgs, uint32_t index )
|
|
{
|
|
if( !msgs->peer->blame )
|
|
msgs->peer->blame = tr_bitfieldNew( msgs->torrent->info.pieceCount );
|
|
tr_bitfieldAdd( msgs->peer->blame, index );
|
|
}
|
|
|
|
/* returns 0 on success, or an errno on failure */
|
|
static int
|
|
clientGotBlock( tr_peermsgs * msgs,
|
|
const uint8_t * data,
|
|
const struct peer_request * req )
|
|
{
|
|
int err;
|
|
tr_torrent * tor = msgs->torrent;
|
|
const tr_block_index_t block = _tr_block( tor, req->index, req->offset );
|
|
|
|
assert( msgs );
|
|
assert( req );
|
|
|
|
if( req->length != tr_torBlockCountBytes( msgs->torrent, block ) ) {
|
|
dbgmsg( msgs, "wrong block size -- expected %u, got %d",
|
|
tr_torBlockCountBytes( msgs->torrent, block ), req->length );
|
|
return EMSGSIZE;
|
|
}
|
|
|
|
/* save the block */
|
|
dbgmsg( msgs, "got block %u:%u->%u", req->index, req->offset, req->length );
|
|
|
|
if( !tr_peerMgrDidPeerRequest( msgs->torrent, msgs->peer, block ) ) {
|
|
dbgmsg( msgs, "we didn't ask for this message..." );
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
*** Save the block
|
|
**/
|
|
|
|
if(( err = tr_ioWrite( tor, req->index, req->offset, req->length, data )))
|
|
return err;
|
|
|
|
addPeerToBlamefield( msgs, req->index );
|
|
fireGotBlock( msgs, req );
|
|
return 0;
|
|
}
|
|
|
|
static int peerPulse( void * vmsgs );
|
|
|
|
static void
|
|
didWrite( tr_peerIo * io UNUSED, size_t bytesWritten, int wasPieceData, void * vmsgs )
|
|
{
|
|
tr_peermsgs * msgs = vmsgs;
|
|
firePeerGotData( msgs, bytesWritten, wasPieceData );
|
|
|
|
if ( tr_isPeerIo( io ) && io->userData )
|
|
peerPulse( msgs );
|
|
}
|
|
|
|
static ReadState
|
|
canRead( tr_peerIo * io, void * vmsgs, size_t * piece )
|
|
{
|
|
ReadState ret;
|
|
tr_peermsgs * msgs = vmsgs;
|
|
struct evbuffer * in = tr_peerIoGetReadBuffer( io );
|
|
const size_t inlen = EVBUFFER_LENGTH( in );
|
|
|
|
dbgmsg( msgs, "canRead: inlen is %zu, msgs->state is %d", inlen, msgs->state );
|
|
|
|
if( !inlen )
|
|
{
|
|
ret = READ_LATER;
|
|
}
|
|
else if( msgs->state == AWAITING_BT_PIECE )
|
|
{
|
|
ret = inlen ? readBtPiece( msgs, in, inlen, piece ) : READ_LATER;
|
|
}
|
|
else switch( msgs->state )
|
|
{
|
|
case AWAITING_BT_LENGTH:
|
|
ret = readBtLength ( msgs, in, inlen ); break;
|
|
|
|
case AWAITING_BT_ID:
|
|
ret = readBtId ( msgs, in, inlen ); break;
|
|
|
|
case AWAITING_BT_MESSAGE:
|
|
ret = readBtMessage( msgs, in, inlen ); break;
|
|
|
|
default:
|
|
ret = READ_ERR;
|
|
assert( 0 );
|
|
}
|
|
|
|
dbgmsg( msgs, "canRead: ret is %d", (int)ret );
|
|
|
|
/* log the raw data that was read */
|
|
if( ( ret != READ_ERR ) && ( EVBUFFER_LENGTH( in ) != inlen ) )
|
|
fireClientGotData( msgs, inlen - EVBUFFER_LENGTH( in ), FALSE );
|
|
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
tr_peerMsgsIsReadingBlock( const tr_peermsgs * msgs, tr_block_index_t block )
|
|
{
|
|
if( msgs->state != AWAITING_BT_PIECE )
|
|
return FALSE;
|
|
|
|
return block == _tr_block( msgs->torrent,
|
|
msgs->incoming.blockReq.index,
|
|
msgs->incoming.blockReq.offset );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static void
|
|
updateDesiredRequestCount( tr_peermsgs * msgs, uint64_t now )
|
|
{
|
|
const tr_torrent * const torrent = msgs->torrent;
|
|
|
|
if( tr_torrentIsSeed( msgs->torrent ) )
|
|
{
|
|
msgs->desiredRequestCount = 0;
|
|
}
|
|
else if( msgs->peer->clientIsChoked )
|
|
{
|
|
msgs->desiredRequestCount = 0;
|
|
}
|
|
else if( !msgs->peer->clientIsInterested )
|
|
{
|
|
msgs->desiredRequestCount = 0;
|
|
}
|
|
else
|
|
{
|
|
int irate;
|
|
int estimatedBlocksInPeriod;
|
|
double rate;
|
|
const int floor = 4;
|
|
const int seconds = REQUEST_BUF_SECS;
|
|
|
|
/* Get the rate limit we should use.
|
|
* FIXME: this needs to consider all the other peers as well... */
|
|
rate = tr_peerGetPieceSpeed( msgs->peer, now, TR_PEER_TO_CLIENT );
|
|
if( tr_torrentUsesSpeedLimit( torrent, TR_PEER_TO_CLIENT ) )
|
|
rate = MIN( rate, tr_torrentGetSpeedLimit( torrent, TR_PEER_TO_CLIENT ) );
|
|
|
|
/* honor the session limits, if enabled */
|
|
if( tr_torrentUsesSessionLimits( torrent ) )
|
|
if( tr_sessionGetActiveSpeedLimit( torrent->session, TR_PEER_TO_CLIENT, &irate ) )
|
|
rate = MIN( rate, irate );
|
|
|
|
/* use this desired rate to figure out how
|
|
* many requests we should send to this peer */
|
|
estimatedBlocksInPeriod = ( rate * seconds * 1024 ) / torrent->blockSize;
|
|
msgs->desiredRequestCount = MAX( floor, estimatedBlocksInPeriod );
|
|
|
|
/* honor the peer's maximum request count, if specified */
|
|
if( msgs->reqq > 0 )
|
|
if( msgs->desiredRequestCount > msgs->reqq )
|
|
msgs->desiredRequestCount = msgs->reqq;
|
|
}
|
|
}
|
|
|
|
static void
|
|
updateMetadataRequests( tr_peermsgs * msgs, time_t now )
|
|
{
|
|
int piece;
|
|
|
|
if( msgs->peerSupportsMetadataXfer
|
|
&& tr_torrentGetNextMetadataRequest( msgs->torrent, now, &piece ) )
|
|
{
|
|
tr_benc tmp;
|
|
int payloadLen;
|
|
char * payload;
|
|
tr_peerIo * io = msgs->peer->io;
|
|
struct evbuffer * out = msgs->outMessages;
|
|
|
|
/* build the data message */
|
|
tr_bencInitDict( &tmp, 3 );
|
|
tr_bencDictAddInt( &tmp, "msg_type", METADATA_MSG_TYPE_REQUEST );
|
|
tr_bencDictAddInt( &tmp, "piece", piece );
|
|
payload = tr_bencToStr( &tmp, TR_FMT_BENC, &payloadLen );
|
|
tr_bencFree( &tmp );
|
|
|
|
dbgmsg( msgs, "requesting metadata piece #%d", piece );
|
|
|
|
/* write it out as a LTEP message to our outMessages buffer */
|
|
tr_peerIoWriteUint32( io, out, 2 * sizeof( uint8_t ) + payloadLen );
|
|
tr_peerIoWriteUint8 ( io, out, BT_LTEP );
|
|
tr_peerIoWriteUint8 ( io, out, msgs->ut_metadata_id );
|
|
tr_peerIoWriteBytes ( io, out, payload, payloadLen );
|
|
pokeBatchPeriod( msgs, HIGH_PRIORITY_INTERVAL_SECS );
|
|
dbgOutMessageLen( msgs );
|
|
|
|
tr_free( payload );
|
|
}
|
|
}
|
|
|
|
static void
|
|
updateBlockRequests( tr_peermsgs * msgs )
|
|
{
|
|
if( tr_torrentIsPieceTransferAllowed( msgs->torrent, TR_PEER_TO_CLIENT )
|
|
&& ( msgs->desiredRequestCount > 0 )
|
|
&& ( msgs->peer->pendingReqsToPeer <= ( msgs->desiredRequestCount * 0.66 ) ) )
|
|
{
|
|
int i;
|
|
int n;
|
|
const int numwant = msgs->desiredRequestCount - msgs->peer->pendingReqsToPeer;
|
|
tr_block_index_t * blocks = tr_new( tr_block_index_t, numwant );
|
|
|
|
tr_peerMgrGetNextRequests( msgs->torrent, msgs->peer, numwant, blocks, &n );
|
|
|
|
for( i=0; i<n; ++i )
|
|
{
|
|
struct peer_request req;
|
|
blockToReq( msgs->torrent, blocks[i], &req );
|
|
protocolSendRequest( msgs, &req );
|
|
}
|
|
|
|
tr_free( blocks );
|
|
}
|
|
}
|
|
|
|
static void
|
|
prefetchPieces( tr_peermsgs *msgs )
|
|
{
|
|
int i;
|
|
|
|
/* Maintain 12 prefetched blocks per unchoked peer */
|
|
for( i=msgs->prefetchCount; i<msgs->peer->pendingReqsToClient && i<12; ++i )
|
|
{
|
|
const struct peer_request * req = msgs->peerAskedFor + i;
|
|
tr_ioPrefetch( msgs->torrent, req->index, req->offset, req->length );
|
|
++msgs->prefetchCount;
|
|
}
|
|
}
|
|
|
|
static size_t
|
|
fillOutputBuffer( tr_peermsgs * msgs, time_t now )
|
|
{
|
|
int piece;
|
|
size_t bytesWritten = 0;
|
|
struct peer_request req;
|
|
const tr_bool haveMessages = EVBUFFER_LENGTH( msgs->outMessages ) != 0;
|
|
const tr_bool fext = tr_peerIoSupportsFEXT( msgs->peer->io );
|
|
|
|
/**
|
|
*** Protocol messages
|
|
**/
|
|
|
|
if( haveMessages && !msgs->outMessagesBatchedAt ) /* fresh batch */
|
|
{
|
|
dbgmsg( msgs, "started an outMessages batch (length is %zu)", EVBUFFER_LENGTH( msgs->outMessages ) );
|
|
msgs->outMessagesBatchedAt = now;
|
|
}
|
|
else if( haveMessages && ( ( now - msgs->outMessagesBatchedAt ) >= msgs->outMessagesBatchPeriod ) )
|
|
{
|
|
const size_t len = EVBUFFER_LENGTH( msgs->outMessages );
|
|
/* flush the protocol messages */
|
|
dbgmsg( msgs, "flushing outMessages... to %p (length is %zu)", msgs->peer->io, len );
|
|
tr_peerIoWriteBuf( msgs->peer->io, msgs->outMessages, FALSE );
|
|
msgs->clientSentAnythingAt = now;
|
|
msgs->outMessagesBatchedAt = 0;
|
|
msgs->outMessagesBatchPeriod = LOW_PRIORITY_INTERVAL_SECS;
|
|
bytesWritten += len;
|
|
}
|
|
|
|
/**
|
|
*** Metadata Pieces
|
|
**/
|
|
|
|
if( ( tr_peerIoGetWriteBufferSpace( msgs->peer->io, now ) >= METADATA_PIECE_SIZE )
|
|
&& popNextMetadataRequest( msgs, &piece ) )
|
|
{
|
|
char * data;
|
|
int dataLen;
|
|
tr_bool ok = FALSE;
|
|
|
|
data = tr_torrentGetMetadataPiece( msgs->torrent, piece, &dataLen );
|
|
if( ( dataLen > 0 ) && ( data != NULL ) )
|
|
{
|
|
tr_benc tmp;
|
|
int payloadLen;
|
|
char * payload;
|
|
tr_peerIo * io = msgs->peer->io;
|
|
struct evbuffer * out = msgs->outMessages;
|
|
|
|
/* build the data message */
|
|
tr_bencInitDict( &tmp, 3 );
|
|
tr_bencDictAddInt( &tmp, "msg_type", METADATA_MSG_TYPE_DATA );
|
|
tr_bencDictAddInt( &tmp, "piece", piece );
|
|
tr_bencDictAddInt( &tmp, "total_size", msgs->torrent->infoDictLength );
|
|
payload = tr_bencToStr( &tmp, TR_FMT_BENC, &payloadLen );
|
|
tr_bencFree( &tmp );
|
|
|
|
/* write it out as a LTEP message to our outMessages buffer */
|
|
tr_peerIoWriteUint32( io, out, 2 * sizeof( uint8_t ) + payloadLen + dataLen );
|
|
tr_peerIoWriteUint8 ( io, out, BT_LTEP );
|
|
tr_peerIoWriteUint8 ( io, out, msgs->ut_metadata_id );
|
|
tr_peerIoWriteBytes ( io, out, payload, payloadLen );
|
|
tr_peerIoWriteBytes ( io, out, data, dataLen );
|
|
pokeBatchPeriod( msgs, HIGH_PRIORITY_INTERVAL_SECS );
|
|
dbgOutMessageLen( msgs );
|
|
|
|
tr_free( payload );
|
|
tr_free( data );
|
|
|
|
ok = TRUE;
|
|
}
|
|
|
|
if( !ok ) /* send a rejection message */
|
|
{
|
|
tr_benc tmp;
|
|
int payloadLen;
|
|
char * payload;
|
|
tr_peerIo * io = msgs->peer->io;
|
|
struct evbuffer * out = msgs->outMessages;
|
|
|
|
/* build the rejection message */
|
|
tr_bencInitDict( &tmp, 2 );
|
|
tr_bencDictAddInt( &tmp, "msg_type", METADATA_MSG_TYPE_REJECT );
|
|
tr_bencDictAddInt( &tmp, "piece", piece );
|
|
payload = tr_bencToStr( &tmp, TR_FMT_BENC, &payloadLen );
|
|
tr_bencFree( &tmp );
|
|
|
|
/* write it out as a LTEP message to our outMessages buffer */
|
|
tr_peerIoWriteUint32( io, out, 2 * sizeof( uint8_t ) + payloadLen );
|
|
tr_peerIoWriteUint8 ( io, out, BT_LTEP );
|
|
tr_peerIoWriteUint8 ( io, out, msgs->ut_metadata_id );
|
|
tr_peerIoWriteBytes ( io, out, payload, payloadLen );
|
|
pokeBatchPeriod( msgs, HIGH_PRIORITY_INTERVAL_SECS );
|
|
dbgOutMessageLen( msgs );
|
|
|
|
tr_free( payload );
|
|
}
|
|
}
|
|
|
|
/**
|
|
*** Data Blocks
|
|
**/
|
|
|
|
if( ( tr_peerIoGetWriteBufferSpace( msgs->peer->io, now ) >= msgs->torrent->blockSize )
|
|
&& popNextRequest( msgs, &req ) )
|
|
{
|
|
--msgs->prefetchCount;
|
|
|
|
if( requestIsValid( msgs, &req )
|
|
&& tr_cpPieceIsComplete( &msgs->torrent->completion, req.index ) )
|
|
{
|
|
/* FIXME(libevent2) use evbuffer_reserve_space() + evbuffer_commit_space() */
|
|
int err;
|
|
const uint32_t msglen = 4 + 1 + 4 + 4 + req.length;
|
|
struct evbuffer * out;
|
|
tr_peerIo * io = msgs->peer->io;
|
|
|
|
out = evbuffer_new( );
|
|
evbuffer_expand( out, msglen );
|
|
|
|
tr_peerIoWriteUint32( io, out, sizeof( uint8_t ) + 2 * sizeof( uint32_t ) + req.length );
|
|
tr_peerIoWriteUint8 ( io, out, BT_PIECE );
|
|
tr_peerIoWriteUint32( io, out, req.index );
|
|
tr_peerIoWriteUint32( io, out, req.offset );
|
|
|
|
err = tr_ioRead( msgs->torrent, req.index, req.offset, req.length, EVBUFFER_DATA(out)+EVBUFFER_LENGTH(out) );
|
|
if( err )
|
|
{
|
|
if( fext )
|
|
protocolSendReject( msgs, &req );
|
|
}
|
|
else
|
|
{
|
|
dbgmsg( msgs, "sending block %u:%u->%u", req.index, req.offset, req.length );
|
|
EVBUFFER_LENGTH(out) += req.length;
|
|
assert( EVBUFFER_LENGTH( out ) == msglen );
|
|
tr_peerIoWriteBuf( io, out, TRUE );
|
|
bytesWritten += EVBUFFER_LENGTH( out );
|
|
msgs->clientSentAnythingAt = now;
|
|
}
|
|
|
|
evbuffer_free( out );
|
|
|
|
if( err )
|
|
{
|
|
bytesWritten = 0;
|
|
msgs = NULL;
|
|
}
|
|
}
|
|
else if( fext ) /* peer needs a reject message */
|
|
{
|
|
protocolSendReject( msgs, &req );
|
|
}
|
|
|
|
if( msgs != NULL )
|
|
prefetchPieces( msgs );
|
|
}
|
|
|
|
/**
|
|
*** Keepalive
|
|
**/
|
|
|
|
if( ( msgs != NULL )
|
|
&& ( msgs->clientSentAnythingAt != 0 )
|
|
&& ( ( now - msgs->clientSentAnythingAt ) > KEEPALIVE_INTERVAL_SECS ) )
|
|
{
|
|
dbgmsg( msgs, "sending a keepalive message" );
|
|
tr_peerIoWriteUint32( msgs->peer->io, msgs->outMessages, 0 );
|
|
pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
|
|
}
|
|
|
|
return bytesWritten;
|
|
}
|
|
|
|
static int
|
|
peerPulse( void * vmsgs )
|
|
{
|
|
tr_peermsgs * msgs = vmsgs;
|
|
const time_t now = tr_time( );
|
|
|
|
if ( tr_isPeerIo( msgs->peer->io ) ) {
|
|
updateDesiredRequestCount( msgs, tr_date( ) );
|
|
updateBlockRequests( msgs );
|
|
updateMetadataRequests( msgs, now );
|
|
}
|
|
|
|
for( ;; )
|
|
if( fillOutputBuffer( msgs, now ) < 1 )
|
|
break;
|
|
|
|
return TRUE; /* loop forever */
|
|
}
|
|
|
|
void
|
|
tr_peerMsgsPulse( tr_peermsgs * msgs )
|
|
{
|
|
if( msgs != NULL )
|
|
peerPulse( msgs );
|
|
}
|
|
|
|
static void
|
|
gotError( tr_peerIo * io UNUSED,
|
|
short what,
|
|
void * vmsgs )
|
|
{
|
|
if( what & EVBUFFER_TIMEOUT )
|
|
dbgmsg( vmsgs, "libevent got a timeout, what=%hd", what );
|
|
if( what & ( EVBUFFER_EOF | EVBUFFER_ERROR ) )
|
|
dbgmsg( vmsgs, "libevent got an error! what=%hd, errno=%d (%s)",
|
|
what, errno, tr_strerror( errno ) );
|
|
fireError( vmsgs, ENOTCONN );
|
|
}
|
|
|
|
static void
|
|
sendBitfield( tr_peermsgs * msgs )
|
|
{
|
|
struct evbuffer * out = msgs->outMessages;
|
|
tr_bitfield * field;
|
|
tr_piece_index_t lazyPieces[LAZY_PIECE_COUNT];
|
|
size_t i;
|
|
size_t lazyCount = 0;
|
|
|
|
field = tr_bitfieldDup( tr_cpPieceBitfield( &msgs->torrent->completion ) );
|
|
|
|
if( tr_sessionIsLazyBitfieldEnabled( getSession( msgs ) ) )
|
|
{
|
|
/** Lazy bitfields aren't a high priority or secure, so I'm opting for
|
|
speed over a truly random sample -- let's limit the pool size to
|
|
the first 1000 pieces so large torrents don't bog things down */
|
|
size_t poolSize;
|
|
const size_t maxPoolSize = MIN( msgs->torrent->info.pieceCount, 1000 );
|
|
tr_piece_index_t * pool = tr_new( tr_piece_index_t, maxPoolSize );
|
|
|
|
/* build the pool */
|
|
for( i=poolSize=0; i<maxPoolSize; ++i )
|
|
if( tr_bitfieldHas( field, i ) )
|
|
pool[poolSize++] = i;
|
|
|
|
/* pull random piece indices from the pool */
|
|
while( ( poolSize > 0 ) && ( lazyCount < LAZY_PIECE_COUNT ) )
|
|
{
|
|
const int pos = tr_cryptoWeakRandInt( poolSize );
|
|
const tr_piece_index_t piece = pool[pos];
|
|
tr_bitfieldRem( field, piece );
|
|
lazyPieces[lazyCount++] = piece;
|
|
pool[pos] = pool[--poolSize];
|
|
}
|
|
|
|
/* cleanup */
|
|
tr_free( pool );
|
|
}
|
|
|
|
tr_peerIoWriteUint32( msgs->peer->io, out,
|
|
sizeof( uint8_t ) + field->byteCount );
|
|
tr_peerIoWriteUint8 ( msgs->peer->io, out, BT_BITFIELD );
|
|
/* FIXME(libevent2): use evbuffer_add_reference() */
|
|
tr_peerIoWriteBytes ( msgs->peer->io, out, field->bits, field->byteCount );
|
|
dbgmsg( msgs, "sending bitfield... outMessage size is now %zu",
|
|
EVBUFFER_LENGTH( out ) );
|
|
pokeBatchPeriod( msgs, IMMEDIATE_PRIORITY_INTERVAL_SECS );
|
|
|
|
for( i = 0; i < lazyCount; ++i )
|
|
protocolSendHave( msgs, lazyPieces[i] );
|
|
|
|
tr_bitfieldFree( field );
|
|
}
|
|
|
|
static void
|
|
tellPeerWhatWeHave( tr_peermsgs * msgs )
|
|
{
|
|
const tr_bool fext = tr_peerIoSupportsFEXT( msgs->peer->io );
|
|
|
|
if( fext && ( tr_cpGetStatus( &msgs->torrent->completion ) == TR_SEED ) )
|
|
{
|
|
protocolSendHaveAll( msgs );
|
|
}
|
|
else if( fext && ( tr_cpHaveValid( &msgs->torrent->completion ) == 0 ) )
|
|
{
|
|
protocolSendHaveNone( msgs );
|
|
}
|
|
else
|
|
{
|
|
sendBitfield( msgs );
|
|
}
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
/* some peers give us error messages if we send
|
|
more than this many peers in a single pex message
|
|
http://wiki.theory.org/BitTorrentPeerExchangeConventions */
|
|
#define MAX_PEX_ADDED 50
|
|
#define MAX_PEX_DROPPED 50
|
|
|
|
typedef struct
|
|
{
|
|
tr_pex * added;
|
|
tr_pex * dropped;
|
|
tr_pex * elements;
|
|
int addedCount;
|
|
int droppedCount;
|
|
int elementCount;
|
|
}
|
|
PexDiffs;
|
|
|
|
static void
|
|
pexAddedCb( void * vpex,
|
|
void * userData )
|
|
{
|
|
PexDiffs * diffs = userData;
|
|
tr_pex * pex = vpex;
|
|
|
|
if( diffs->addedCount < MAX_PEX_ADDED )
|
|
{
|
|
diffs->added[diffs->addedCount++] = *pex;
|
|
diffs->elements[diffs->elementCount++] = *pex;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
pexDroppedCb( void * vpex,
|
|
void * userData )
|
|
{
|
|
PexDiffs * diffs = userData;
|
|
tr_pex * pex = vpex;
|
|
|
|
if( diffs->droppedCount < MAX_PEX_DROPPED )
|
|
{
|
|
diffs->dropped[diffs->droppedCount++] = *pex;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
pexElementCb( void * vpex,
|
|
void * userData )
|
|
{
|
|
PexDiffs * diffs = userData;
|
|
tr_pex * pex = vpex;
|
|
|
|
diffs->elements[diffs->elementCount++] = *pex;
|
|
}
|
|
|
|
static void
|
|
sendPex( tr_peermsgs * msgs )
|
|
{
|
|
if( msgs->peerSupportsPex && tr_torrentAllowsPex( msgs->torrent ) )
|
|
{
|
|
PexDiffs diffs;
|
|
PexDiffs diffs6;
|
|
tr_pex * newPex = NULL;
|
|
tr_pex * newPex6 = NULL;
|
|
const int newCount = tr_peerMgrGetPeers( msgs->torrent, &newPex, TR_AF_INET, TR_PEERS_CONNECTED, MAX_PEX_PEER_COUNT );
|
|
const int newCount6 = tr_peerMgrGetPeers( msgs->torrent, &newPex6, TR_AF_INET6, TR_PEERS_CONNECTED, MAX_PEX_PEER_COUNT );
|
|
|
|
/* build the diffs */
|
|
diffs.added = tr_new( tr_pex, newCount );
|
|
diffs.addedCount = 0;
|
|
diffs.dropped = tr_new( tr_pex, msgs->pexCount );
|
|
diffs.droppedCount = 0;
|
|
diffs.elements = tr_new( tr_pex, newCount + msgs->pexCount );
|
|
diffs.elementCount = 0;
|
|
tr_set_compare( msgs->pex, msgs->pexCount,
|
|
newPex, newCount,
|
|
tr_pexCompare, sizeof( tr_pex ),
|
|
pexDroppedCb, pexAddedCb, pexElementCb, &diffs );
|
|
diffs6.added = tr_new( tr_pex, newCount6 );
|
|
diffs6.addedCount = 0;
|
|
diffs6.dropped = tr_new( tr_pex, msgs->pexCount6 );
|
|
diffs6.droppedCount = 0;
|
|
diffs6.elements = tr_new( tr_pex, newCount6 + msgs->pexCount6 );
|
|
diffs6.elementCount = 0;
|
|
tr_set_compare( msgs->pex6, msgs->pexCount6,
|
|
newPex6, newCount6,
|
|
tr_pexCompare, sizeof( tr_pex ),
|
|
pexDroppedCb, pexAddedCb, pexElementCb, &diffs6 );
|
|
dbgmsg(
|
|
msgs,
|
|
"pex: old peer count %d+%d, new peer count %d+%d, "
|
|
"added %d+%d, removed %d+%d",
|
|
msgs->pexCount, msgs->pexCount6, newCount, newCount6,
|
|
diffs.addedCount, diffs6.addedCount,
|
|
diffs.droppedCount, diffs6.droppedCount );
|
|
|
|
if( !diffs.addedCount && !diffs.droppedCount && !diffs6.addedCount &&
|
|
!diffs6.droppedCount )
|
|
{
|
|
tr_free( diffs.elements );
|
|
tr_free( diffs6.elements );
|
|
}
|
|
else
|
|
{
|
|
int i;
|
|
tr_benc val;
|
|
char * benc;
|
|
int bencLen;
|
|
uint8_t * tmp, *walk;
|
|
tr_peerIo * io = msgs->peer->io;
|
|
struct evbuffer * out = msgs->outMessages;
|
|
|
|
/* update peer */
|
|
tr_free( msgs->pex );
|
|
msgs->pex = diffs.elements;
|
|
msgs->pexCount = diffs.elementCount;
|
|
tr_free( msgs->pex6 );
|
|
msgs->pex6 = diffs6.elements;
|
|
msgs->pexCount6 = diffs6.elementCount;
|
|
|
|
/* build the pex payload */
|
|
tr_bencInitDict( &val, 3 ); /* ipv6 support: left as 3:
|
|
* speed vs. likelihood? */
|
|
|
|
if( diffs.addedCount > 0)
|
|
{
|
|
/* "added" */
|
|
tmp = walk = tr_new( uint8_t, diffs.addedCount * 6 );
|
|
for( i = 0; i < diffs.addedCount; ++i ) {
|
|
memcpy( walk, &diffs.added[i].addr.addr, 4 ); walk += 4;
|
|
memcpy( walk, &diffs.added[i].port, 2 ); walk += 2;
|
|
}
|
|
assert( ( walk - tmp ) == diffs.addedCount * 6 );
|
|
tr_bencDictAddRaw( &val, "added", tmp, walk - tmp );
|
|
tr_free( tmp );
|
|
|
|
/* "added.f" */
|
|
tmp = walk = tr_new( uint8_t, diffs.addedCount );
|
|
for( i = 0; i < diffs.addedCount; ++i )
|
|
*walk++ = diffs.added[i].flags;
|
|
assert( ( walk - tmp ) == diffs.addedCount );
|
|
tr_bencDictAddRaw( &val, "added.f", tmp, walk - tmp );
|
|
tr_free( tmp );
|
|
}
|
|
|
|
if( diffs.droppedCount > 0 )
|
|
{
|
|
/* "dropped" */
|
|
tmp = walk = tr_new( uint8_t, diffs.droppedCount * 6 );
|
|
for( i = 0; i < diffs.droppedCount; ++i ) {
|
|
memcpy( walk, &diffs.dropped[i].addr.addr, 4 ); walk += 4;
|
|
memcpy( walk, &diffs.dropped[i].port, 2 ); walk += 2;
|
|
}
|
|
assert( ( walk - tmp ) == diffs.droppedCount * 6 );
|
|
tr_bencDictAddRaw( &val, "dropped", tmp, walk - tmp );
|
|
tr_free( tmp );
|
|
}
|
|
|
|
if( diffs6.addedCount > 0 )
|
|
{
|
|
/* "added6" */
|
|
tmp = walk = tr_new( uint8_t, diffs6.addedCount * 18 );
|
|
for( i = 0; i < diffs6.addedCount; ++i ) {
|
|
memcpy( walk, &diffs6.added[i].addr.addr.addr6.s6_addr, 16 );
|
|
walk += 16;
|
|
memcpy( walk, &diffs6.added[i].port, 2 );
|
|
walk += 2;
|
|
}
|
|
assert( ( walk - tmp ) == diffs6.addedCount * 18 );
|
|
tr_bencDictAddRaw( &val, "added6", tmp, walk - tmp );
|
|
tr_free( tmp );
|
|
|
|
/* "added6.f" */
|
|
tmp = walk = tr_new( uint8_t, diffs6.addedCount );
|
|
for( i = 0; i < diffs6.addedCount; ++i )
|
|
*walk++ = diffs6.added[i].flags;
|
|
assert( ( walk - tmp ) == diffs6.addedCount );
|
|
tr_bencDictAddRaw( &val, "added6.f", tmp, walk - tmp );
|
|
tr_free( tmp );
|
|
}
|
|
|
|
if( diffs6.droppedCount > 0 )
|
|
{
|
|
/* "dropped6" */
|
|
tmp = walk = tr_new( uint8_t, diffs6.droppedCount * 18 );
|
|
for( i = 0; i < diffs6.droppedCount; ++i ) {
|
|
memcpy( walk, &diffs6.dropped[i].addr.addr.addr6.s6_addr, 16 );
|
|
walk += 16;
|
|
memcpy( walk, &diffs6.dropped[i].port, 2 );
|
|
walk += 2;
|
|
}
|
|
assert( ( walk - tmp ) == diffs6.droppedCount * 18);
|
|
tr_bencDictAddRaw( &val, "dropped6", tmp, walk - tmp );
|
|
tr_free( tmp );
|
|
}
|
|
|
|
/* write the pex message */
|
|
benc = tr_bencToStr( &val, TR_FMT_BENC, &bencLen );
|
|
tr_peerIoWriteUint32( io, out, 2 * sizeof( uint8_t ) + bencLen );
|
|
tr_peerIoWriteUint8 ( io, out, BT_LTEP );
|
|
tr_peerIoWriteUint8 ( io, out, msgs->ut_pex_id );
|
|
tr_peerIoWriteBytes ( io, out, benc, bencLen );
|
|
pokeBatchPeriod( msgs, HIGH_PRIORITY_INTERVAL_SECS );
|
|
dbgmsg( msgs, "sending a pex message; outMessage size is now %zu", EVBUFFER_LENGTH( out ) );
|
|
dbgOutMessageLen( msgs );
|
|
|
|
tr_free( benc );
|
|
tr_bencFree( &val );
|
|
}
|
|
|
|
/* cleanup */
|
|
tr_free( diffs.added );
|
|
tr_free( diffs.dropped );
|
|
tr_free( newPex );
|
|
tr_free( diffs6.added );
|
|
tr_free( diffs6.dropped );
|
|
tr_free( newPex6 );
|
|
|
|
/*msgs->clientSentPexAt = tr_time( );*/
|
|
}
|
|
}
|
|
|
|
static void
|
|
pexPulse( int foo UNUSED, short bar UNUSED, void * vmsgs )
|
|
{
|
|
struct tr_peermsgs * msgs = vmsgs;
|
|
|
|
sendPex( msgs );
|
|
|
|
tr_timerAdd( &msgs->pexTimer, PEX_INTERVAL_SECS, 0 );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
tr_peermsgs*
|
|
tr_peerMsgsNew( struct tr_torrent * torrent,
|
|
struct tr_peer * peer,
|
|
tr_delivery_func func,
|
|
void * userData,
|
|
tr_publisher_tag * setme )
|
|
{
|
|
tr_peermsgs * m;
|
|
|
|
assert( peer );
|
|
assert( peer->io );
|
|
|
|
m = tr_new0( tr_peermsgs, 1 );
|
|
m->publisher = TR_PUBLISHER_INIT;
|
|
m->peer = peer;
|
|
m->torrent = torrent;
|
|
m->peer->clientIsChoked = 1;
|
|
m->peer->peerIsChoked = 1;
|
|
m->peer->clientIsInterested = 0;
|
|
m->peer->peerIsInterested = 0;
|
|
m->state = AWAITING_BT_LENGTH;
|
|
m->outMessages = evbuffer_new( );
|
|
m->outMessagesBatchedAt = 0;
|
|
m->outMessagesBatchPeriod = LOW_PRIORITY_INTERVAL_SECS;
|
|
m->incoming.block = evbuffer_new( );
|
|
evtimer_set( &m->pexTimer, pexPulse, m );
|
|
tr_timerAdd( &m->pexTimer, PEX_INTERVAL_SECS, 0 );
|
|
peer->msgs = m;
|
|
|
|
*setme = tr_publisherSubscribe( &m->publisher, func, userData );
|
|
|
|
if( tr_peerIoSupportsLTEP( peer->io ) )
|
|
sendLtepHandshake( m );
|
|
|
|
if( tr_dhtEnabled( torrent->session ) && tr_peerIoSupportsDHT( peer->io ))
|
|
{
|
|
/* Only send PORT over IPv6 when the IPv6 DHT is running (BEP-32). */
|
|
const struct tr_address *addr = tr_peerIoGetAddress( peer->io, NULL );
|
|
if( addr->type == TR_AF_INET || tr_globalIPv6() ) {
|
|
protocolSendPort( m, tr_dhtPort( torrent->session ) );
|
|
}
|
|
}
|
|
|
|
tellPeerWhatWeHave( m );
|
|
|
|
tr_peerIoSetIOFuncs( m->peer->io, canRead, didWrite, gotError, m );
|
|
updateDesiredRequestCount( m, tr_date( ) );
|
|
|
|
return m;
|
|
}
|
|
|
|
void
|
|
tr_peerMsgsFree( tr_peermsgs* msgs )
|
|
{
|
|
if( msgs )
|
|
{
|
|
evtimer_del( &msgs->pexTimer );
|
|
tr_publisherDestruct( &msgs->publisher );
|
|
|
|
evbuffer_free( msgs->incoming.block );
|
|
evbuffer_free( msgs->outMessages );
|
|
tr_free( msgs->pex6 );
|
|
tr_free( msgs->pex );
|
|
|
|
memset( msgs, ~0, sizeof( tr_peermsgs ) );
|
|
tr_free( msgs );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerMsgsUnsubscribe( tr_peermsgs * peer,
|
|
tr_publisher_tag tag )
|
|
{
|
|
tr_publisherUnsubscribe( &peer->publisher, tag );
|
|
}
|