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transmission/libtransmission/peer-msgs.c

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/*
* This file Copyright (C) 2007 Charles Kerr <charles@rebelbase.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h> /* basename */
#include <netinet/in.h> /* struct in_addr */
#include <sys/types.h> /* event.h needs this */
#include <event.h>
#include "transmission.h"
#include "bencode.h"
#include "completion.h"
#include "inout.h"
#include "list.h"
#include "peer-io.h"
#include "peer-mgr.h"
#include "peer-mgr-private.h"
#include "peer-msgs.h"
#include "ratecontrol.h"
#include "trevent.h"
#include "utils.h"
/**
***
**/
#define MAX_ALLOWED_SET_COUNT 10 /* number of pieces generated for allow-fast,
threshold for fast-allowing others */
enum
{
BT_CHOKE = 0,
BT_UNCHOKE = 1,
BT_INTERESTED = 2,
BT_NOT_INTERESTED = 3,
BT_HAVE = 4,
BT_BITFIELD = 5,
BT_REQUEST = 6,
BT_PIECE = 7,
BT_CANCEL = 8,
BT_PORT = 9,
BT_SUGGEST = 13,
BT_HAVE_ALL = 14,
BT_HAVE_NONE = 15,
BT_REJECT = 16,
BT_ALLOWED_FAST = 17,
BT_LTEP = 20,
LTEP_HANDSHAKE = 0,
OUR_LTEP_PEX = 1,
MAX_REQUEST_BYTE_COUNT = (16 * 1024), /* drop requests who want too much */
KEEPALIVE_INTERVAL_SECS = 90, /* idle seconds before we send a keepalive */
PEX_INTERVAL = (60 * 1000), /* msec between calls to sendPex() */
PEER_PULSE_INTERVAL = (100), /* msec between calls to pulse() */
RATE_PULSE_INTERVAL = (333), /* msec between calls to ratePulse() */
};
enum
{
AWAITING_BT_LENGTH,
AWAITING_BT_MESSAGE,
READING_BT_PIECE
};
struct peer_request
{
uint32_t index;
uint32_t offset;
uint32_t length;
time_t time_requested;
};
static int
compareRequest( const void * va, const void * vb )
{
struct peer_request * a = (struct peer_request*) va;
struct peer_request * b = (struct peer_request*) vb;
if( a->index != b->index ) return a->index - b->index;
if( a->offset != b->offset ) return a->offset - b->offset;
if( a->length != b->length ) return a->length - b->length;
return 0;
}
struct tr_peermsgs
{
tr_peer * info;
tr_handle * handle;
tr_torrent * torrent;
tr_peerIo * io;
tr_publisher_t * publisher;
struct evbuffer * outBlock; /* buffer of all the current piece message */
struct evbuffer * outMessages; /* buffer of all the non-piece messages */
struct evbuffer * inBlock; /* the block we're currently receiving */
tr_list * peerAskedFor;
tr_list * peerAskedForFast;
tr_list * clientAskedFor;
tr_list * clientWillAskFor;
tr_timer * rateTimer;
tr_timer * pulseTimer;
tr_timer * pexTimer;
struct peer_request blockToUs; /* the block currntly being sent to us */
time_t lastReqAddedAt;
time_t clientSentPexAt;
time_t clientSentAnythingAt;
unsigned int notListening : 1;
unsigned int peerSupportsPex : 1;
unsigned int clientSentLtepHandshake : 1;
unsigned int peerSentLtepHandshake : 1;
tr_bitfield * clientAllowedPieces;
tr_bitfield * peerAllowedPieces;
uint8_t state;
uint8_t ut_pex_id;
uint16_t pexCount;
uint32_t incomingMessageLength;
uint32_t maxActiveRequests;
uint32_t minActiveRequests;
tr_pex * pex;
};
/**
***
**/
static void
myDebug( const char * file, int line,
const struct tr_peermsgs * msgs,
const char * fmt, ... )
{
FILE * fp = tr_getLog( );
if( fp != NULL )
{
va_list args;
char timestr[64];
struct evbuffer * buf = evbuffer_new( );
char * myfile = tr_strdup( file );
evbuffer_add_printf( buf, "[%s] %s [%s]: ",
tr_getLogTimeStr( timestr, sizeof(timestr) ),
tr_peerIoGetAddrStr( msgs->io ),
msgs->info->client );
va_start( args, fmt );
evbuffer_add_vprintf( buf, fmt, args );
va_end( args );
evbuffer_add_printf( buf, " (%s:%d)\n", basename(myfile), line );
fwrite( EVBUFFER_DATA(buf), 1, EVBUFFER_LENGTH(buf), fp );
tr_free( myfile );
evbuffer_free( buf );
}
}
#define dbgmsg(msgs, fmt...) myDebug(__FILE__, __LINE__, msgs, ##fmt )
/**
***
**/
static void
protocolSendRequest( tr_peermsgs * msgs, const struct peer_request * req )
{
tr_peerIo * io = msgs->io;
struct evbuffer * out = msgs->outMessages;
dbgmsg( msgs, "requesting %u:%u->%u", req->index, req->offset, req->length );
tr_peerIoWriteUint32( io, out, sizeof(uint8_t) + 3*sizeof(uint32_t) );
tr_peerIoWriteUint8 ( io, out, BT_REQUEST );
tr_peerIoWriteUint32( io, out, req->index );
tr_peerIoWriteUint32( io, out, req->offset );
tr_peerIoWriteUint32( io, out, req->length );
}
static void
protocolSendCancel( tr_peermsgs * msgs, const struct peer_request * req )
{
tr_peerIo * io = msgs->io;
struct evbuffer * out = msgs->outMessages;
dbgmsg( msgs, "cancelling %u:%u->%u", req->index, req->offset, req->length );
tr_peerIoWriteUint32( io, out, sizeof(uint8_t) + 3*sizeof(uint32_t) );
tr_peerIoWriteUint8 ( io, out, BT_CANCEL );
tr_peerIoWriteUint32( io, out, req->index );
tr_peerIoWriteUint32( io, out, req->offset );
tr_peerIoWriteUint32( io, out, req->length );
}
static void
protocolSendHave( tr_peermsgs * msgs, uint32_t index )
{
tr_peerIo * io = msgs->io;
struct evbuffer * out = msgs->outMessages;
dbgmsg( msgs, "sending Have %u", index );
tr_peerIoWriteUint32( io, out, sizeof(uint8_t) + sizeof(uint32_t) );
tr_peerIoWriteUint8 ( io, out, BT_HAVE );
tr_peerIoWriteUint32( io, out, index );
}
static void
protocolSendChoke( tr_peermsgs * msgs, int choke )
{
tr_peerIo * io = msgs->io;
struct evbuffer * out = msgs->outMessages;
dbgmsg( msgs, "sending %s", (choke ? "Choke" : "Unchoke") );
tr_peerIoWriteUint32( io, out, sizeof(uint8_t) );
tr_peerIoWriteUint8 ( io, out, choke ? BT_CHOKE : BT_UNCHOKE );
}
/**
*** EVENTS
**/
static const tr_peermsgs_event blankEvent = { 0, 0, 0, 0, 0.0f };
static void
publish( tr_peermsgs * msgs, tr_peermsgs_event * e )
{
tr_publisherPublish( msgs->publisher, msgs->info, e );
}
static void
fireGotError( tr_peermsgs * msgs )
{
tr_peermsgs_event e = blankEvent;
e.eventType = TR_PEERMSG_GOT_ERROR;
publish( msgs, &e );
}
static void
fireNeedReq( tr_peermsgs * msgs )
{
tr_peermsgs_event e = blankEvent;
e.eventType = TR_PEERMSG_NEED_REQ;
publish( msgs, &e );
}
static void
firePeerProgress( tr_peermsgs * msgs )
{
tr_peermsgs_event e = blankEvent;
e.eventType = TR_PEERMSG_PEER_PROGRESS;
e.progress = msgs->info->progress;
publish( msgs, &e );
}
static void
fireClientHave( tr_peermsgs * msgs, uint32_t pieceIndex )
{
tr_peermsgs_event e = blankEvent;
e.eventType = TR_PEERMSG_CLIENT_HAVE;
e.pieceIndex = pieceIndex;
publish( msgs, &e );
}
static void
fireGotBlock( tr_peermsgs * msgs, uint32_t pieceIndex, uint32_t offset, uint32_t length )
{
tr_peermsgs_event e = blankEvent;
e.eventType = TR_PEERMSG_CLIENT_BLOCK;
e.pieceIndex = pieceIndex;
e.offset = offset;
e.length = length;
publish( msgs, &e );
}
static void
fireCancelledReq( tr_peermsgs * msgs, const struct peer_request * req )
{
tr_peermsgs_event e = blankEvent;
e.eventType = TR_PEERMSG_CANCEL;
e.pieceIndex = req->index;
e.offset = req->offset;
e.length = req->length;
publish( msgs, &e );
}
/**
*** INTEREST
**/
static int
isPieceInteresting( const tr_peermsgs * peer,
int piece )
{
const tr_torrent * torrent = peer->torrent;
if( torrent->info.pieces[piece].dnd ) /* we don't want it */
return FALSE;
if( tr_cpPieceIsComplete( torrent->completion, piece ) ) /* we have it */
return FALSE;
if( !tr_bitfieldHas( peer->info->have, piece ) ) /* peer doesn't have it */
return FALSE;
if( tr_bitfieldHas( peer->info->banned, piece ) ) /* peer is banned */
return FALSE;
return TRUE;
}
/* "interested" means we'll ask for piece data if they unchoke us */
static int
isPeerInteresting( const tr_peermsgs * msgs )
{
int i;
const tr_torrent * torrent;
const tr_bitfield * bitfield;
const int clientIsSeed = tr_torrentIsSeed( msgs->torrent );
if( clientIsSeed )
return FALSE;
torrent = msgs->torrent;
bitfield = tr_cpPieceBitfield( torrent->completion );
if( !msgs->info->have )
return TRUE;
assert( bitfield->len == msgs->info->have->len );
for( i=0; i<torrent->info.pieceCount; ++i )
if( isPieceInteresting( msgs, i ) )
return TRUE;
return FALSE;
}
static void
sendInterest( tr_peermsgs * msgs, int weAreInterested )
{
assert( msgs != NULL );
assert( weAreInterested==0 || weAreInterested==1 );
msgs->info->clientIsInterested = weAreInterested;
dbgmsg( msgs, "Sending %s",
weAreInterested ? "Interested" : "Not Interested");
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, sizeof(uint8_t) );
tr_peerIoWriteUint8 ( msgs->io, msgs->outMessages,
weAreInterested ? BT_INTERESTED : BT_NOT_INTERESTED );
}
static void
updateInterest( tr_peermsgs * msgs )
{
const int i = isPeerInteresting( msgs );
if( i != msgs->info->clientIsInterested )
sendInterest( msgs, i );
if( i )
fireNeedReq( msgs );
}
#define MIN_CHOKE_PERIOD_SEC 10
static void
cancelAllRequestsToClientExceptFast( tr_peermsgs * msgs )
{
tr_list_free( &msgs->peerAskedFor, tr_free );
}
void
tr_peerMsgsSetChoke( tr_peermsgs * msgs, int choke )
{
const time_t fibrillationTime = time(NULL) - MIN_CHOKE_PERIOD_SEC;
assert( msgs != NULL );
assert( msgs->info != NULL );
assert( choke==0 || choke==1 );
if( msgs->info->chokeChangedAt > fibrillationTime )
{
dbgmsg( msgs, "Not changing choke to %d to avoid fibrillation", choke );
}
else if( msgs->info->peerIsChoked != choke )
{
msgs->info->peerIsChoked = choke;
if( choke )
cancelAllRequestsToClientExceptFast( msgs );
protocolSendChoke( msgs, choke );
msgs->info->chokeChangedAt = time( NULL );
}
}
/**
***
**/
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 );
}
#if 0
static void
sendFastSuggest( tr_peermsgs * msgs,
uint32_t pieceIndex )
{
dbgmsg( msgs, "w00t SUGGESTing them piece #%d", pieceIndex );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, sizeof(uint8_t) + sizeof(uint32_t) );
tr_peerIoWriteUint8( msgs->io, msgs->outMessages, BT_SUGGEST );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, pieceIndex );
updateInterest( msgs );
}
#endif
static void
sendFastHave( tr_peermsgs * msgs,
int all)
{
dbgmsg( msgs, "w00t telling them we %s pieces", (all ? "HAVE_ALL" : "HAVE_NONE" ) );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, sizeof(uint8_t) );
tr_peerIoWriteUint8( msgs->io, msgs->outMessages, ( all ? BT_HAVE_ALL : BT_HAVE_NONE ) );
updateInterest( msgs );
}
static void
sendFastReject( tr_peermsgs * msgs,
uint32_t pieceIndex,
uint32_t offset,
uint32_t length )
{
assert( msgs != NULL );
assert( length > 0 );
if( tr_peerIoSupportsFEXT( msgs->io ) )
{
const uint32_t len = sizeof(uint8_t) + 3 * sizeof(uint32_t);
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, len );
tr_peerIoWriteUint8( msgs->io, msgs->outMessages, BT_REJECT );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, pieceIndex );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, offset );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, length );
}
}
static void
sendFastAllowed( tr_peermsgs * msgs,
uint32_t pieceIndex)
{
dbgmsg( msgs, "w00t telling them we ALLOW_FAST piece #%d", pieceIndex );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, sizeof(uint8_t) + sizeof(uint32_t) );
tr_peerIoWriteUint8( msgs->io, msgs->outMessages, BT_ALLOWED_FAST );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, pieceIndex );
}
static void
sendFastAllowedSet( tr_peermsgs * msgs )
{
int i = 0;
while (i <= msgs->torrent->info.pieceCount )
{
if ( tr_bitfieldHas( msgs->peerAllowedPieces, i) )
sendFastAllowed( msgs, i );
i++;
}
}
/**
***
**/
static int
reqIsValid( const tr_peermsgs * msgs, uint32_t index, uint32_t offset, uint32_t length )
{
const tr_torrent * tor = msgs->torrent;
if( index >= (uint32_t) tor->info.pieceCount )
return FALSE;
if ( (int)offset >= tr_torPieceCountBytes( tor, (int)index ) )
return FALSE;
if( length > MAX_REQUEST_BYTE_COUNT )
return FALSE;
if( tr_pieceOffset( tor, index, offset, length ) > tor->info.totalSize )
return FALSE;
return TRUE;
}
static int
requestIsValid( const tr_peermsgs * msgs, const struct peer_request * req )
{
return reqIsValid( msgs, req->index, req->offset, req->length );
}
static void
pumpRequestQueue( tr_peermsgs * msgs )
{
const int max = msgs->maxActiveRequests;
const int min = msgs->minActiveRequests;
int count = tr_list_size( msgs->clientAskedFor );
int sent = 0;
if( count > min )
return;
if( msgs->info->clientIsChoked )
return;
while( ( count < max ) && ( msgs->clientWillAskFor != NULL ) )
{
struct peer_request * req = tr_list_pop_front( &msgs->clientWillAskFor );
protocolSendRequest( msgs, req );
req->time_requested = msgs->lastReqAddedAt = time( NULL );
tr_list_append( &msgs->clientAskedFor, req );
++count;
++sent;
}
if( sent )
dbgmsg( msgs, "pump sent %d requests, now have %d active and %d queued",
sent,
tr_list_size(msgs->clientAskedFor),
tr_list_size(msgs->clientWillAskFor) );
if( count < max )
fireNeedReq( msgs );
}
int
tr_peerMsgsAddRequest( tr_peermsgs * msgs,
uint32_t index,
uint32_t offset,
uint32_t length )
{
const int req_max = msgs->maxActiveRequests;
struct peer_request tmp, *req;
assert( msgs != NULL );
assert( msgs->torrent != NULL );
assert( reqIsValid( msgs, index, offset, length ) );
/**
*** Reasons to decline the request
**/
/* don't send requests to choked clients */
if( msgs->info->clientIsChoked ) {
dbgmsg( msgs, "declining request because they're choking us" );
return TR_ADDREQ_CLIENT_CHOKED;
}
/* peer doesn't have this piece */
if( !tr_bitfieldHas( msgs->info->have, index ) )
return TR_ADDREQ_MISSING;
/* peer's queue is full */
if( tr_list_size( msgs->clientWillAskFor ) >= req_max ) {
dbgmsg( msgs, "declining request because we're full" );
return TR_ADDREQ_FULL;
}
/* have we already asked for this piece? */
tmp.index = index;
tmp.offset = offset;
tmp.length = length;
if( tr_list_find( msgs->clientAskedFor, &tmp, compareRequest ) ) {
dbgmsg( msgs, "declining because it's a duplicate" );
return TR_ADDREQ_DUPLICATE;
}
if( tr_list_find( msgs->clientWillAskFor, &tmp, compareRequest ) ) {
dbgmsg( msgs, "declining because it's a duplicate" );
return TR_ADDREQ_DUPLICATE;
}
/**
*** Accept this request
**/
dbgmsg( msgs, "added req for piece %d, offset %d", (int)index, (int)offset );
req = tr_new0( struct peer_request, 1 );
*req = tmp;
tr_list_append( &msgs->clientWillAskFor, req );
return TR_ADDREQ_OK;
}
static void
cancelAllRequestsToPeer( tr_peermsgs * msgs )
{
struct peer_request * req;
while(( req = tr_list_pop_front( &msgs->clientWillAskFor ) ))
{
fireCancelledReq( msgs, req );
tr_free( req );
}
while(( req = tr_list_pop_front( &msgs->clientAskedFor ) ))
{
fireCancelledReq( msgs, req );
protocolSendCancel( msgs, req );
tr_free( req );
}
}
void
tr_peerMsgsCancel( tr_peermsgs * msgs,
uint32_t pieceIndex,
uint32_t offset,
uint32_t length )
{
struct peer_request *req, tmp;
assert( msgs != NULL );
assert( length > 0 );
/* have we asked the peer for this piece? */
tmp.index = pieceIndex;
tmp.offset = offset;
tmp.length = length;
/* if it's only in the queue and hasn't been sent yet, free it */
if(( req = tr_list_remove( &msgs->clientWillAskFor, &tmp, compareRequest ) ))
{
fireCancelledReq( msgs, req );
tr_free( req );
}
/* if it's already been sent, send a cancel message too */
if(( req = tr_list_remove( &msgs->clientAskedFor, &tmp, compareRequest ) ))
{
protocolSendCancel( msgs, req );
fireCancelledReq( msgs, req );
tr_free( req );
}
}
/**
***
**/
static void
sendLtepHandshake( tr_peermsgs * msgs )
{
benc_val_t val, *m;
char * buf;
int len;
int pex;
const char * v = TR_NAME " " USERAGENT_PREFIX;
const int port = tr_getPublicPort( msgs->handle );
struct evbuffer * outbuf;
if( msgs->clientSentLtepHandshake )
return;
outbuf = evbuffer_new( );
dbgmsg( msgs, "sending an ltep handshake" );
msgs->clientSentLtepHandshake = 1;
/* decide if we want to advertise pex support */
if( !tr_torrentIsPexEnabled( msgs->torrent ) )
pex = 0;
else if( msgs->peerSentLtepHandshake )
pex = msgs->peerSupportsPex ? 1 : 0;
else
pex = 1;
tr_bencInit( &val, TYPE_DICT );
tr_bencDictReserve( &val, 4 );
tr_bencInitInt( tr_bencDictAdd( &val, "e" ), 1 );
m = tr_bencDictAdd( &val, "m" );
tr_bencInit( m, TYPE_DICT );
if( pex ) {
tr_bencDictReserve( m, 1 );
tr_bencInitInt( tr_bencDictAdd( m, "ut_pex" ), OUR_LTEP_PEX );
}
if( port > 0 )
tr_bencInitInt( tr_bencDictAdd( &val, "p" ), port );
tr_bencInitStr( tr_bencDictAdd( &val, "v" ), v, 0, 1 );
buf = tr_bencSaveMalloc( &val, &len );
tr_peerIoWriteUint32( msgs->io, outbuf, 2*sizeof(uint8_t) + len );
tr_peerIoWriteUint8 ( msgs->io, outbuf, BT_LTEP );
tr_peerIoWriteUint8 ( msgs->io, outbuf, LTEP_HANDSHAKE );
tr_peerIoWriteBytes ( msgs->io, outbuf, buf, len );
tr_peerIoWriteBuf( msgs->io, outbuf );
#if 0
dbgmsg( msgs, "here is the ltep handshake we sent:" );
tr_bencPrint( &val );
#endif
/* cleanup */
tr_bencFree( &val );
tr_free( buf );
evbuffer_free( outbuf );
}
static void
parseLtepHandshake( tr_peermsgs * msgs, int len, struct evbuffer * inbuf )
{
benc_val_t val, * sub;
uint8_t * tmp = tr_new( uint8_t, len );
tr_peerIoReadBytes( msgs->io, inbuf, tmp, len );
msgs->peerSentLtepHandshake = 1;
if( tr_bencLoad( tmp, len, &val, NULL ) || val.type!=TYPE_DICT ) {
dbgmsg( msgs, "GET extended-handshake, couldn't get dictionary" );
tr_free( tmp );
return;
}
#if 0
dbgmsg( msgs, "here is the ltep handshake we read:" );
tr_bencPrint( &val );
#endif
/* does the peer prefer encrypted connections? */
sub = tr_bencDictFind( &val, "e" );
if( tr_bencIsInt( sub ) )
msgs->info->encryption_preference = sub->val.i
? ENCRYPTION_PREFERENCE_YES
: ENCRYPTION_PREFERENCE_NO;
/* check supported messages for utorrent pex */
sub = tr_bencDictFind( &val, "m" );
if( tr_bencIsDict( sub ) ) {
sub = tr_bencDictFind( sub, "ut_pex" );
if( tr_bencIsInt( sub ) ) {
msgs->peerSupportsPex = 1;
msgs->ut_pex_id = (uint8_t) sub->val.i;
dbgmsg( msgs, "msgs->ut_pex is %d", (int)msgs->ut_pex_id );
}
}
/* get peer's listening port */
sub = tr_bencDictFind( &val, "p" );
if( tr_bencIsInt( sub ) ) {
msgs->info->port = htons( (uint16_t)sub->val.i );
dbgmsg( msgs, "msgs->port is now %hu", msgs->info->port );
}
tr_bencFree( &val );
tr_free( tmp );
}
static void
parseUtPex( tr_peermsgs * msgs, int msglen, struct evbuffer * inbuf )
{
benc_val_t val, * sub;
uint8_t * tmp;
if( !tr_torrentIsPexEnabled( msgs->torrent ) ) /* no sharing! */
return;
tmp = tr_new( uint8_t, msglen );
tr_peerIoReadBytes( msgs->io, inbuf, tmp, msglen );
if( tr_bencLoad( tmp, msglen, &val, NULL ) || !tr_bencIsDict( &val ) ) {
dbgmsg( msgs, "GET can't read extended-pex dictionary" );
tr_free( tmp );
return;
}
sub = tr_bencDictFind( &val, "added" );
if( tr_bencIsStr(sub) && ((sub->val.s.i % 6) == 0)) {
const int n = sub->val.s.i / 6 ;
dbgmsg( msgs, "got %d peers from uT pex", n );
tr_peerMgrAddPeers( msgs->handle->peerMgr,
msgs->torrent->info.hash,
TR_PEER_FROM_PEX,
(uint8_t*)sub->val.s.s, n );
}
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->io, inbuf, &ltep_msgid );
msglen--;
if( ltep_msgid == LTEP_HANDSHAKE )
{
dbgmsg( msgs, "got ltep handshake" );
parseLtepHandshake( msgs, msglen, inbuf );
sendLtepHandshake( msgs );
sendPex( msgs );
}
else if( ltep_msgid == msgs->ut_pex_id )
{
dbgmsg( msgs, "got ut pex" );
msgs->peerSupportsPex = 1;
parseUtPex( 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 )
{
uint32_t len;
const size_t needlen = sizeof(uint32_t);
if( EVBUFFER_LENGTH(inbuf) < needlen )
return READ_MORE;
tr_peerIoReadUint32( msgs->io, inbuf, &len );
if( len == 0 ) /* peer sent us a keepalive message */
dbgmsg( msgs, "got KeepAlive" );
else {
msgs->incomingMessageLength = len;
msgs->state = AWAITING_BT_MESSAGE;
}
return READ_AGAIN;
}
static void
updatePeerProgress( tr_peermsgs * msgs )
{
msgs->info->progress = tr_bitfieldCountTrueBits( msgs->info->have ) / (float)msgs->torrent->info.pieceCount;
dbgmsg( msgs, "peer progress is %f", msgs->info->progress );
updateInterest( msgs );
firePeerProgress( msgs );
}
static int
clientCanSendFastBlock( const tr_peermsgs * msgs UNUSED )
{
/* FIXME(tiennou): base this on how many blocks we've already sent this
* peer, or maybe how many fast blocks per minute we've sent overall,
* or maybe how much bandwidth we're already using up w/o fast peers.
* I don't know what the Right Thing here is, but
* the previous measurement of how many pieces we have is not enough. */
return FALSE;
}
static void
peerMadeRequest( tr_peermsgs * msgs, const struct peer_request * req )
{
const int reqIsValid = requestIsValid( msgs, req );
const int clientHasPiece = reqIsValid && tr_cpPieceIsComplete( msgs->torrent->completion, req->index );
const int peerIsChoked = msgs->info->peerIsChoked;
const int peerIsFast = tr_peerIoSupportsFEXT( msgs->io );
const int pieceIsFast = reqIsValid && tr_bitfieldHas( msgs->peerAllowedPieces, req->index );
const int canSendFast = clientCanSendFastBlock( msgs );
if( !reqIsValid ) /* bad request */
{
dbgmsg( msgs, "rejecting an invalid request." );
sendFastReject( msgs, req->index, req->offset, req->length );
}
else if( !clientHasPiece ) /* we don't have it */
{
dbgmsg( msgs, "rejecting request for a piece we don't have." );
sendFastReject( msgs, req->index, req->offset, req->length );
}
else if( peerIsChoked && !peerIsFast ) /* maybe he doesn't know he's choked? */
{
tr_peerMsgsSetChoke( msgs, 1 );
sendFastReject( msgs, req->index, req->offset, req->length );
}
else if( peerIsChoked && peerIsFast && ( !pieceIsFast || !canSendFast ) )
{
sendFastReject( msgs, req->index, req->offset, req->length );
}
else /* YAY */
{
struct peer_request * tmp = tr_new( struct peer_request, 1 );
*tmp = *req;
if( peerIsFast && pieceIsFast )
tr_list_append( &msgs->peerAskedForFast, tmp );
else
tr_list_append( &msgs->peerAskedFor, tmp );
}
}
static int
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_HAVE_ALL:
case BT_HAVE_NONE:
return len==1;
case BT_HAVE:
case BT_SUGGEST:
case BT_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_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
readBtMessage( tr_peermsgs * msgs, struct evbuffer * inbuf )
{
uint8_t id;
uint32_t ui32;
uint32_t msglen = msgs->incomingMessageLength;
if( EVBUFFER_LENGTH(inbuf) < msglen )
return READ_MORE;
tr_peerIoReadUint8( msgs->io, inbuf, &id );
dbgmsg( msgs, "got BT id %d, len %d", (int)id, (int)msglen );
if( !messageLengthIsCorrect( msgs, id, msglen ) )
{
fireGotError( msgs );
return READ_DONE;
}
--msglen;
switch( id )
{
case BT_CHOKE:
dbgmsg( msgs, "got Choke" );
msgs->info->clientIsChoked = 1;
cancelAllRequestsToPeer( msgs );
cancelAllRequestsToClientExceptFast( msgs );
break;
case BT_UNCHOKE:
dbgmsg( msgs, "got Unchoke" );
msgs->info->clientIsChoked = 0;
fireNeedReq( msgs );
break;
case BT_INTERESTED:
dbgmsg( msgs, "got Interested" );
msgs->info->peerIsInterested = 1;
tr_peerMsgsSetChoke( msgs, 0 );
break;
case BT_NOT_INTERESTED:
dbgmsg( msgs, "got Not Interested" );
msgs->info->peerIsInterested = 0;
break;
case BT_HAVE:
tr_peerIoReadUint32( msgs->io, inbuf, &ui32 );
dbgmsg( msgs, "got Have: %u", ui32 );
tr_bitfieldAdd( msgs->info->have, ui32 );
updatePeerProgress( msgs );
tr_rcTransferred( msgs->torrent->swarmspeed, msgs->torrent->info.pieceSize );
break;
case BT_BITFIELD: {
const int clientIsSeed = tr_torrentIsSeed( msgs->torrent );
dbgmsg( msgs, "got a bitfield" );
tr_peerIoReadBytes( msgs->io, inbuf, msgs->info->have->bits, msglen );
updatePeerProgress( msgs );
tr_peerMsgsSetChoke( msgs, !clientIsSeed || (msgs->info->progress<1.0) );
fireNeedReq( msgs );
break;
}
case BT_REQUEST: {
struct peer_request req;
tr_peerIoReadUint32( msgs->io, inbuf, &req.index );
tr_peerIoReadUint32( msgs->io, inbuf, &req.offset );
tr_peerIoReadUint32( msgs->io, inbuf, &req.length );
dbgmsg( msgs, "got Request: %u:%u->%u", req.index, req.offset, req.length );
peerMadeRequest( msgs, &req );
break;
}
case BT_CANCEL: {
struct peer_request req;
tr_peerIoReadUint32( msgs->io, inbuf, &req.index );
tr_peerIoReadUint32( msgs->io, inbuf, &req.offset );
tr_peerIoReadUint32( msgs->io, inbuf, &req.length );
dbgmsg( msgs, "got a Cancel %u:%u->%u", req.index, req.offset, req.length );
tr_free( tr_list_remove( &msgs->peerAskedForFast, &req, compareRequest ) );
tr_free( tr_list_remove( &msgs->peerAskedFor, &req, compareRequest ) );
break;
}
case BT_PIECE: {
dbgmsg( msgs, "got a Piece!" );
assert( msgs->blockToUs.length == 0 );
tr_peerIoReadUint32( msgs->io, inbuf, &msgs->blockToUs.index );
tr_peerIoReadUint32( msgs->io, inbuf, &msgs->blockToUs.offset );
msgs->blockToUs.length = msglen - 8;
assert( EVBUFFER_LENGTH(msgs->inBlock) == 0 );
msgs->state = msgs->blockToUs.length ? READING_BT_PIECE : AWAITING_BT_LENGTH;
return READ_AGAIN;
break;
}
case BT_PORT: {
dbgmsg( msgs, "Got a BT_PORT" );
tr_peerIoReadUint16( msgs->io, inbuf, &msgs->info->port );
break;
}
case BT_SUGGEST: {
/* FIXME(tiennou) */
uint32_t index;
tr_peerIoReadUint32( msgs->io, inbuf, &index );
break;
}
case BT_HAVE_ALL:
dbgmsg( msgs, "Got a BT_HAVE_ALL" );
tr_bitfieldAddRange( msgs->info->have, 0, msgs->torrent->info.pieceCount );
updatePeerProgress( msgs );
break;
case BT_HAVE_NONE:
dbgmsg( msgs, "Got a BT_HAVE_NONE" );
tr_bitfieldClear( msgs->info->have );
updatePeerProgress( msgs );
break;
case BT_REJECT: {
struct peer_request req;
dbgmsg( msgs, "Got a BT_REJECT" );
tr_peerIoReadUint32( msgs->io, inbuf, &req.index );
tr_peerIoReadUint32( msgs->io, inbuf, &req.offset );
tr_peerIoReadUint32( msgs->io, inbuf, &req.length );
tr_free( tr_list_remove( &msgs->clientAskedFor, &req, compareRequest ) );
break;
}
case BT_ALLOWED_FAST: {
dbgmsg( msgs, "Got a BT_ALLOWED_FAST" );
tr_peerIoReadUint32( msgs->io, inbuf, &ui32 );
tr_bitfieldAdd( msgs->clientAllowedPieces, ui32 );
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->io, inbuf, msglen );
break;
}
msgs->incomingMessageLength = -1;
msgs->state = AWAITING_BT_LENGTH;
return READ_AGAIN;
}
static void
clientGotBytes( tr_peermsgs * msgs, uint32_t byteCount )
{
tr_torrent * tor = msgs->torrent;
tor->activityDate = tr_date( );
tor->downloadedCur += byteCount;
msgs->info->pieceDataActivityDate = time( NULL );
tr_rcTransferred( msgs->info->rcToClient, byteCount );
tr_rcTransferred( tor->download, byteCount );
tr_rcTransferred( tor->handle->download, byteCount );
}
static void
peerGotBytes( tr_peermsgs * msgs, uint32_t byteCount )
{
tr_torrent * tor = msgs->torrent;
tor->activityDate = tr_date( );
tor->uploadedCur += byteCount;
msgs->info->pieceDataActivityDate = time( NULL );
tr_rcTransferred( msgs->info->rcToPeer, byteCount );
tr_rcTransferred( tor->upload, byteCount );
tr_rcTransferred( tor->handle->upload, byteCount );
}
static int
canDownload( const tr_peermsgs * msgs )
{
tr_torrent * tor = msgs->torrent;
if( tor->downloadLimitMode == TR_SPEEDLIMIT_GLOBAL )
return !tor->handle->useDownloadLimit || tr_rcCanTransfer( tor->handle->download );
if( tor->downloadLimitMode == TR_SPEEDLIMIT_SINGLE )
return tr_rcCanTransfer( tor->download );
return TRUE;
}
static void
reassignBytesToCorrupt( tr_peermsgs * msgs, uint32_t byteCount )
{
tr_torrent * tor = msgs->torrent;
/* increment the `corrupt' field */
tor->corruptCur += byteCount;
/* decrement the `downloaded' field */
if( tor->downloadedCur >= byteCount )
tor->downloadedCur -= byteCount;
else
tor->downloadedCur = 0;
}
static void
gotBadPiece( tr_peermsgs * msgs, uint32_t pieceIndex )
{
const uint32_t byteCount = tr_torPieceCountBytes( msgs->torrent, (int)pieceIndex );
reassignBytesToCorrupt( msgs, byteCount );
}
static void
gotUnwantedBlock( tr_peermsgs * msgs,
uint32_t index UNUSED,
uint32_t offset UNUSED,
uint32_t length )
{
reassignBytesToCorrupt( msgs, length );
}
static void
addUsToBlamefield( tr_peermsgs * msgs, uint32_t index )
{
if( !msgs->info->blame )
msgs->info->blame = tr_bitfieldNew( msgs->torrent->info.pieceCount );
tr_bitfieldAdd( msgs->info->blame, index );
}
static void
gotBlock( tr_peermsgs * msgs,
struct evbuffer * inbuf,
uint32_t index,
uint32_t offset,
uint32_t length )
{
tr_torrent * tor = msgs->torrent;
const int block = _tr_block( tor, index, offset );
struct peer_request key, *req;
/**
*** Remove the block from our `we asked for this' list
**/
key.index = index;
key.offset = offset;
key.length = length;
req = (struct peer_request*) tr_list_remove( &msgs->clientAskedFor, &key,
compareRequest );
if( req == NULL ) {
gotUnwantedBlock( msgs, index, offset, length );
dbgmsg( msgs, "we didn't ask for this message..." );
return;
}
dbgmsg( msgs, "got block %u:%u->%u (turnaround time %d secs)",
req->index, req->offset, req->length,
(int)(time(NULL) - req->time_requested) );
tr_free( req );
dbgmsg( msgs, "peer has %d more blocks we've asked for",
tr_list_size(msgs->clientAskedFor));
/**
*** Error checks
**/
if( tr_cpBlockIsComplete( tor->completion, block ) ) {
dbgmsg( msgs, "have this block already..." );
tr_dbg( "have this block already..." );
gotUnwantedBlock( msgs, index, offset, length );
return;
}
if( (int)length != tr_torBlockCountBytes( tor, block ) ) {
dbgmsg( msgs, "block is the wrong length..." );
tr_dbg( "block is the wrong length..." );
gotUnwantedBlock( msgs, index, offset, length );
return;
}
/**
*** Write the block
**/
if( tr_ioWrite( tor, index, offset, length, EVBUFFER_DATA( inbuf )))
return;
#warning this sanity check is here to help track down the excess corrupt data bug, but is expensive and should be removed before the next release
{
uint8_t * tmp = tr_new( uint8_t, length );
const int val = tr_ioRead( tor, index, offset, length, tmp );
assert( !val );
assert( !memcmp( tmp, EVBUFFER_DATA(inbuf), length ) );
tr_free( tmp );
}
tr_cpBlockAdd( tor->completion, block );
addUsToBlamefield( msgs, index );
fireGotBlock( msgs, index, offset, length );
/**
*** Handle if this was the last block in the piece
**/
if( tr_cpPieceIsComplete( tor->completion, index ) )
{
if( tr_ioHash( tor, index ) )
{
gotBadPiece( msgs, index );
return;
}
fireClientHave( msgs, index );
}
}
static ReadState
readBtPiece( tr_peermsgs * msgs, struct evbuffer * inbuf )
{
uint32_t inlen;
uint8_t * tmp;
assert( msgs != NULL );
assert( msgs->blockToUs.length > 0 );
assert( inbuf != NULL );
assert( EVBUFFER_LENGTH( inbuf ) > 0 );
/* read from the inbuf into our block buffer */
inlen = MIN( EVBUFFER_LENGTH(inbuf), msgs->blockToUs.length );
tmp = tr_new( uint8_t, inlen );
tr_peerIoReadBytes( msgs->io, inbuf, tmp, inlen );
evbuffer_add( msgs->inBlock, tmp, inlen );
/* update our tables accordingly */
assert( inlen >= msgs->blockToUs.length );
msgs->blockToUs.length -= inlen;
msgs->info->peerSentPieceDataAt = time( NULL );
clientGotBytes( msgs, inlen );
/* if this was the entire block, save it */
if( !msgs->blockToUs.length )
{
dbgmsg( msgs, "got block %u:%u", msgs->blockToUs.index, msgs->blockToUs.offset );
assert( (int)EVBUFFER_LENGTH( msgs->inBlock ) == tr_torBlockCountBytes( msgs->torrent, _tr_block(msgs->torrent,msgs->blockToUs.index, msgs->blockToUs.offset) ) );
gotBlock( msgs, msgs->inBlock,
msgs->blockToUs.index,
msgs->blockToUs.offset,
EVBUFFER_LENGTH( msgs->inBlock ) );
evbuffer_drain( msgs->inBlock, ~0 );
msgs->state = AWAITING_BT_LENGTH;
}
/* cleanup */
tr_free( tmp );
return READ_AGAIN;
}
static ReadState
canRead( struct bufferevent * evin, void * vmsgs )
{
ReadState ret;
tr_peermsgs * msgs = (tr_peermsgs *) vmsgs;
struct evbuffer * inbuf = EVBUFFER_INPUT ( evin );
if( !canDownload( msgs ) )
{
msgs->notListening = 1;
tr_peerIoSetIOMode ( msgs->io, 0, EV_READ );
ret = READ_DONE;
}
else switch( msgs->state )
{
case AWAITING_BT_LENGTH: ret = readBtLength ( msgs, inbuf ); break;
case AWAITING_BT_MESSAGE: ret = readBtMessage ( msgs, inbuf ); break;
case READING_BT_PIECE: ret = readBtPiece ( msgs, inbuf ); break;
default: assert( 0 );
}
return ret;
}
static void
sendKeepalive( tr_peermsgs * msgs )
{
dbgmsg( msgs, "sending a keepalive message" );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, 0 );
}
/**
***
**/
static int
canWrite( const tr_peermsgs * msgs )
{
/* don't let our outbuffer get too large */
if( tr_peerIoWriteBytesWaiting( msgs->io ) > 4096 )
return FALSE;
return TRUE;
}
static size_t
getUploadMax( const tr_peermsgs * msgs )
{
static const size_t maxval = ~0;
const tr_torrent * tor = msgs->torrent;
if( !canWrite( msgs ) )
return 0;
if( tor->uploadLimitMode == TR_SPEEDLIMIT_GLOBAL )
return tor->handle->useUploadLimit ? tr_rcBytesLeft( tor->handle->upload ) : maxval;
if( tor->uploadLimitMode == TR_SPEEDLIMIT_SINGLE )
return tr_rcBytesLeft( tor->upload );
return maxval;
}
static int
ratePulse( void * vmsgs )
{
tr_peermsgs * msgs = (tr_peermsgs *) vmsgs;
msgs->info->rateToClient = tr_rcRate( msgs->info->rcToClient );
msgs->info->rateToPeer = tr_rcRate( msgs->info->rcToPeer );
msgs->maxActiveRequests = MIN( 8 + (int)(msgs->info->rateToClient/10), 100 );
msgs->minActiveRequests = msgs->maxActiveRequests / 2;
return TRUE;
}
static struct peer_request*
popNextRequest( tr_peermsgs * msgs )
{
struct peer_request * ret;
ret = tr_list_pop_front( &msgs->peerAskedForFast );
if( !ret )
ret = tr_list_pop_front( &msgs->peerAskedFor);
return ret;
}
static int
pulse( void * vmsgs )
{
const time_t now = time( NULL );
tr_peermsgs * msgs = vmsgs;
struct peer_request * r;
size_t len;
/* if we froze out a downloaded block because of speed limits,
start listening to the peer again */
if( msgs->notListening && canDownload( msgs ) )
{
msgs->notListening = 0;
tr_peerIoSetIOMode ( msgs->io, EV_READ, 0 );
}
pumpRequestQueue( msgs );
if( !canWrite( msgs ) )
{
}
else if(( len = EVBUFFER_LENGTH( msgs->outBlock ) ))
{
const size_t uploadMax = getUploadMax( msgs );
const size_t outlen = MIN( len, uploadMax );
tr_peerIoWrite( msgs->io, EVBUFFER_DATA( msgs->outBlock ), outlen );
evbuffer_drain( msgs->outBlock, outlen );
msgs->clientSentAnythingAt = now;
peerGotBytes( msgs, outlen );
len -= outlen;
dbgmsg( msgs, "wrote %d bytes; %d left in block", (int)outlen, (int)len );
fflush( stdout );
}
else if(( len = EVBUFFER_LENGTH( msgs->outMessages ) ))
{
tr_peerIoWriteBuf( msgs->io, msgs->outMessages );
msgs->clientSentAnythingAt = now;
}
else if( ( now - msgs->clientSentAnythingAt ) > KEEPALIVE_INTERVAL_SECS )
{
sendKeepalive( msgs );
}
if( !EVBUFFER_LENGTH( msgs->outBlock )
&& (( r = popNextRequest( msgs )))
&& requestIsValid( msgs, r )
&& tr_cpPieceIsComplete( msgs->torrent->completion, r->index ) )
{
uint8_t * buf = tr_new( uint8_t, r->length );
if( !tr_ioRead( msgs->torrent, r->index, r->offset, r->length, buf ) )
{
tr_peerIo * io = msgs->io;
struct evbuffer * out = msgs->outBlock;
dbgmsg( msgs, "sending block %u:%u->%u", r->index, r->offset, r->length );
tr_peerIoWriteUint32( io, out, sizeof(uint8_t) + 2*sizeof(uint32_t) + r->length );
tr_peerIoWriteUint8 ( io, out, BT_PIECE );
tr_peerIoWriteUint32( io, out, r->index );
tr_peerIoWriteUint32( io, out, r->offset );
tr_peerIoWriteBytes ( io, out, buf, r->length );
}
tr_free( buf );
tr_free( r );
pulse( msgs ); /* start sending it right away */
}
return TRUE; /* loop forever */
}
static void
didWrite( struct bufferevent * evin UNUSED, void * vmsgs )
{
pulse( vmsgs );
}
static void
gotError( struct bufferevent * evbuf UNUSED, short what, void * vmsgs )
{
dbgmsg( vmsgs, "libevent got an error! what=%d, errno=%d (%s)",
(int)what, errno, strerror(errno) );
fireGotError( vmsgs );
}
static void
sendBitfield( tr_peermsgs * msgs )
{
const tr_bitfield * bitfield = tr_cpPieceBitfield( msgs->torrent->completion );
struct evbuffer * out = msgs->outMessages;
dbgmsg( msgs, "sending peer a bitfield message" );
tr_peerIoWriteUint32( msgs->io, out, sizeof(uint8_t) + bitfield->len );
tr_peerIoWriteUint8 ( msgs->io, out, BT_BITFIELD );
tr_peerIoWriteBytes ( msgs->io, out, bitfield->bits, bitfield->len );
}
/**
***
**/
/* some peers give us error messages if we send
more than this many peers in a single pex message */
#define MAX_PEX_DIFFS 200
typedef struct
{
tr_pex * added;
tr_pex * dropped;
tr_pex * elements;
int addedCount;
int droppedCount;
int elementCount;
int diffCount;
}
PexDiffs;
static void
pexAddedCb( void * vpex, void * userData )
{
PexDiffs * diffs = (PexDiffs *) userData;
tr_pex * pex = (tr_pex *) vpex;
if( diffs->diffCount < MAX_PEX_DIFFS )
{
diffs->diffCount++;
diffs->added[diffs->addedCount++] = *pex;
diffs->elements[diffs->elementCount++] = *pex;
}
}
static void
pexRemovedCb( void * vpex, void * userData )
{
PexDiffs * diffs = (PexDiffs *) userData;
tr_pex * pex = (tr_pex *) vpex;
if( diffs->diffCount < MAX_PEX_DIFFS )
{
diffs->diffCount++;
diffs->dropped[diffs->droppedCount++] = *pex;
}
}
static void
pexElementCb( void * vpex, void * userData )
{
PexDiffs * diffs = (PexDiffs *) userData;
tr_pex * pex = (tr_pex *) vpex;
if( diffs->diffCount < MAX_PEX_DIFFS )
{
diffs->diffCount++;
diffs->elements[diffs->elementCount++] = *pex;
}
}
static void
sendPex( tr_peermsgs * msgs )
{
if( msgs->peerSupportsPex && tr_torrentIsPexEnabled( msgs->torrent ) )
{
int i;
tr_pex * newPex = NULL;
const int newCount = tr_peerMgrGetPeers( msgs->handle->peerMgr, msgs->torrent->info.hash, &newPex );
PexDiffs diffs;
benc_val_t val, *added, *dropped, *flags;
uint8_t *tmp, *walk;
char * benc;
int bencLen;
/* 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;
diffs.diffCount = 0;
tr_set_compare( msgs->pex, msgs->pexCount,
newPex, newCount,
tr_pexCompare, sizeof(tr_pex),
pexRemovedCb, pexAddedCb, pexElementCb, &diffs );
dbgmsg( msgs, "pex: old peer count %d, new peer count %d, added %d, removed %d", msgs->pexCount, newCount, diffs.addedCount, diffs.droppedCount );
/* update peer */
tr_free( msgs->pex );
msgs->pex = diffs.elements;
msgs->pexCount = diffs.elementCount;
/* build the pex payload */
tr_bencInit( &val, TYPE_DICT );
tr_bencDictReserve( &val, 3 );
/* "added" */
added = tr_bencDictAdd( &val, "added" );
tmp = walk = tr_new( uint8_t, diffs.addedCount * 6 );
for( i=0; i<diffs.addedCount; ++i ) {
memcpy( walk, &diffs.added[i].in_addr, 4 ); walk += 4;
memcpy( walk, &diffs.added[i].port, 2 ); walk += 2;
}
assert( ( walk - tmp ) == diffs.addedCount * 6 );
tr_bencInitStr( added, tmp, walk-tmp, FALSE );
/* "added.f" */
flags = tr_bencDictAdd( &val, "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_bencInitStr( flags, tmp, walk-tmp, FALSE );
/* "dropped" */
dropped = tr_bencDictAdd( &val, "dropped" );
tmp = walk = tr_new( uint8_t, diffs.droppedCount * 6 );
for( i=0; i<diffs.droppedCount; ++i ) {
memcpy( walk, &diffs.dropped[i].in_addr, 4 ); walk += 4;
memcpy( walk, &diffs.dropped[i].port, 2 ); walk += 2;
}
assert( ( walk - tmp ) == diffs.droppedCount * 6 );
tr_bencInitStr( dropped, tmp, walk-tmp, FALSE );
/* write the pex message */
benc = tr_bencSaveMalloc( &val, &bencLen );
tr_peerIoWriteUint32( msgs->io, msgs->outMessages, 2*sizeof(uint8_t) + bencLen );
tr_peerIoWriteUint8 ( msgs->io, msgs->outMessages, BT_LTEP );
tr_peerIoWriteUint8 ( msgs->io, msgs->outMessages, OUR_LTEP_PEX );
tr_peerIoWriteBytes ( msgs->io, msgs->outMessages, benc, bencLen );
/* cleanup */
tr_free( benc );
tr_bencFree( &val );
tr_free( diffs.added );
tr_free( diffs.dropped );
tr_free( newPex );
msgs->clientSentPexAt = time( NULL );
}
}
static int
pexPulse( void * vpeer )
{
sendPex( vpeer );
return TRUE;
}
/**
***
**/
tr_peermsgs*
tr_peerMsgsNew( struct tr_torrent * torrent,
struct tr_peer * info,
tr_delivery_func func,
void * userData,
tr_publisher_tag * setme )
{
tr_peermsgs * m;
assert( info != NULL );
assert( info->io != NULL );
m = tr_new0( tr_peermsgs, 1 );
m->publisher = tr_publisherNew( );
m->info = info;
m->handle = torrent->handle;
m->torrent = torrent;
m->io = info->io;
m->info->clientIsChoked = 1;
m->info->peerIsChoked = 1;
m->info->clientIsInterested = 0;
m->info->peerIsInterested = 0;
m->info->have = tr_bitfieldNew( torrent->info.pieceCount );
m->pulseTimer = tr_timerNew( m->handle, pulse, m, PEER_PULSE_INTERVAL );
m->rateTimer = tr_timerNew( m->handle, ratePulse, m, RATE_PULSE_INTERVAL );
m->pexTimer = tr_timerNew( m->handle, pexPulse, m, PEX_INTERVAL );
m->outMessages = evbuffer_new( );
m->outBlock = evbuffer_new( );
m->inBlock = evbuffer_new( );
m->peerAllowedPieces = NULL;
m->clientAllowedPieces = NULL;
*setme = tr_publisherSubscribe( m->publisher, func, userData );
if ( tr_peerIoSupportsFEXT( m->io ) )
{
/* This peer is fastpeer-enabled, generate its allowed set
* (before registering our callbacks) */
if ( !m->peerAllowedPieces ) {
const struct in_addr *peerAddr = tr_peerIoGetAddress( m->io, NULL );
m->peerAllowedPieces = tr_peerMgrGenerateAllowedSet( MAX_ALLOWED_SET_COUNT,
m->torrent->info.pieceCount,
m->torrent->info.hash,
peerAddr );
}
m->clientAllowedPieces = tr_bitfieldNew( m->torrent->info.pieceCount );
}
tr_peerIoSetTimeoutSecs( m->io, 150 ); /* error if we don't read or write for 2.5 minutes */
tr_peerIoSetIOFuncs( m->io, canRead, didWrite, gotError, m );
tr_peerIoSetIOMode( m->io, EV_READ|EV_WRITE, 0 );
ratePulse( m );
if ( tr_peerIoSupportsLTEP( m->io ) )
sendLtepHandshake( m );
if ( !tr_peerIoSupportsFEXT( m->io ) )
sendBitfield( m );
else {
/* This peer is fastpeer-enabled, send it have-all or have-none if appropriate */
uint32_t peerProgress;
float completion = tr_cpPercentComplete( m->torrent->completion );
if ( completion == 0.0f ) {
sendFastHave( m, 0 );
} else if ( completion == 1.0f ) {
sendFastHave( m, 1 );
} else {
sendBitfield( m );
}
peerProgress = m->torrent->info.pieceCount * m->info->progress;
if ( peerProgress < MAX_ALLOWED_SET_COUNT )
sendFastAllowedSet( m );
}
return m;
}
void
tr_peerMsgsFree( tr_peermsgs* msgs )
{
if( msgs != NULL )
{
tr_timerFree( &msgs->pulseTimer );
tr_timerFree( &msgs->rateTimer );
tr_timerFree( &msgs->pexTimer );
tr_publisherFree( &msgs->publisher );
tr_list_free( &msgs->clientWillAskFor, tr_free );
tr_list_free( &msgs->clientAskedFor, tr_free );
tr_list_free( &msgs->peerAskedForFast, tr_free );
tr_list_free( &msgs->peerAskedFor, tr_free );
evbuffer_free( msgs->outMessages );
evbuffer_free( msgs->outBlock );
evbuffer_free( msgs->inBlock );
tr_free( msgs->pex );
msgs->pexCount = 0;
tr_free( msgs );
}
}
tr_publisher_tag
tr_peerMsgsSubscribe( tr_peermsgs * peer,
tr_delivery_func func,
void * userData )
{
return tr_publisherSubscribe( peer->publisher, func, userData );
}
void
tr_peerMsgsUnsubscribe( tr_peermsgs * peer,
tr_publisher_tag tag )
{
tr_publisherUnsubscribe( peer->publisher, tag );
}
int
tr_peerMsgIsPieceFastAllowed( const tr_peermsgs * peer,
uint32_t index )
{
return tr_bitfieldHas( peer->clientAllowedPieces, index );
}
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