mirror of
https://github.com/transmission/transmission
synced 2024-12-25 17:17:31 +00:00
435 lines
12 KiB
C
435 lines
12 KiB
C
/******************************************************************************
|
|
* Copyright (c) 2005 Eric Petit
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*****************************************************************************/
|
|
|
|
#include "transmission.h"
|
|
|
|
#define MAX_REQUEST_COUNT 32
|
|
#define OUR_REQUEST_COUNT 8 /* TODO: we should detect if we are on a
|
|
high-speed network and adapt */
|
|
|
|
typedef struct tr_request_s
|
|
{
|
|
int index;
|
|
int begin;
|
|
int length;
|
|
|
|
} tr_request_t;
|
|
|
|
struct tr_peer_s
|
|
{
|
|
struct in_addr addr;
|
|
in_port_t port;
|
|
|
|
#define PEER_STATUS_IDLE 1 /* Need to connect */
|
|
#define PEER_STATUS_CONNECTING 2 /* Trying to send handshake */
|
|
#define PEER_STATUS_HANDSHAKE 4 /* Waiting for peer's handshake */
|
|
#define PEER_STATUS_CONNECTED 8 /* Got peer's handshake */
|
|
int status;
|
|
int socket;
|
|
uint64_t date;
|
|
uint64_t keepAlive;
|
|
|
|
char amChoking;
|
|
char amInterested;
|
|
char peerChoking;
|
|
char peerInterested;
|
|
|
|
uint8_t id[20];
|
|
|
|
uint8_t * bitfield;
|
|
|
|
uint8_t * buf;
|
|
int size;
|
|
int pos;
|
|
|
|
uint8_t * outMessages;
|
|
int outMessagesSize;
|
|
int outMessagesPos;
|
|
uint8_t outBlock[13+16384];
|
|
int outBlockSize;
|
|
int outBlockLoaded;
|
|
int outBlockSending;
|
|
|
|
int inRequestCount;
|
|
tr_request_t inRequests[OUR_REQUEST_COUNT];
|
|
int inIndex;
|
|
int inBegin;
|
|
int inLength;
|
|
uint64_t inTotal;
|
|
|
|
int outRequestCount;
|
|
tr_request_t outRequests[MAX_REQUEST_COUNT];
|
|
uint64_t outTotal;
|
|
uint64_t outDate;
|
|
int outSlow;
|
|
};
|
|
|
|
#define peer_dbg( a... ) __peer_dbg( peer, ## a )
|
|
static void __peer_dbg( tr_peer_t * peer, char * msg, ... )
|
|
{
|
|
char string[256];
|
|
va_list args;
|
|
|
|
va_start( args, msg );
|
|
sprintf( string, "%08x:%04x ",
|
|
(uint32_t) peer->addr.s_addr, peer->port );
|
|
vsnprintf( &string[14], sizeof( string ) - 14, msg, args );
|
|
va_end( args );
|
|
|
|
tr_dbg( "%s", string );
|
|
}
|
|
|
|
#include "peermessages.h"
|
|
#include "peerutils.h"
|
|
#include "peerparse.h"
|
|
|
|
/***********************************************************************
|
|
* tr_peerAddOld
|
|
***********************************************************************
|
|
* Tries to add a peer given its IP and port (received from a tracker
|
|
* which doesn't support the "compact" extension).
|
|
**********************************************************************/
|
|
void tr_peerAddOld( tr_torrent_t * tor, char * ip, int port )
|
|
{
|
|
struct in_addr addr;
|
|
|
|
if( tr_netResolve( ip, &addr ) )
|
|
{
|
|
return;
|
|
}
|
|
|
|
addWithAddr( tor, addr, htons( port ) );
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerAddCompact
|
|
***********************************************************************
|
|
* Tries to add a peer. If 's' is a negative value, will use 'addr' and
|
|
* 'port' to connect to the peer. Otherwise, use the already connected
|
|
* socket 's'.
|
|
**********************************************************************/
|
|
void tr_peerAddCompact( tr_torrent_t * tor, struct in_addr addr,
|
|
in_port_t port, int s )
|
|
{
|
|
tr_peer_t * peer;
|
|
|
|
if( s < 0 )
|
|
{
|
|
addWithAddr( tor, addr, port );
|
|
return;
|
|
}
|
|
|
|
if( !( peer = peerInit( tor ) ) )
|
|
{
|
|
tr_netClose( s );
|
|
tr_fdSocketClosed( tor->fdlimit, 0 );
|
|
return;
|
|
}
|
|
|
|
peer->socket = s;
|
|
peer->addr = addr;
|
|
peer->port = port;
|
|
peer->status = PEER_STATUS_CONNECTING;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerRem
|
|
***********************************************************************
|
|
* Frees and closes everything related to the peer at index 'i', and
|
|
* removes it from the peers list.
|
|
**********************************************************************/
|
|
void tr_peerRem( tr_torrent_t * tor, int i )
|
|
{
|
|
tr_peer_t * peer = tor->peers[i];
|
|
int j;
|
|
|
|
for( j = 0; j < peer->inRequestCount; j++ )
|
|
{
|
|
tr_request_t * r;
|
|
int block;
|
|
|
|
r = &peer->inRequests[j];
|
|
block = tr_block( r->index,r->begin );
|
|
tr_cpDownloaderRem( tor->completion, block );
|
|
}
|
|
if( !peer->amChoking )
|
|
{
|
|
tr_uploadChoked( tor->upload );
|
|
}
|
|
if( peer->bitfield )
|
|
{
|
|
free( peer->bitfield );
|
|
}
|
|
if( peer->buf )
|
|
{
|
|
free( peer->buf );
|
|
}
|
|
if( peer->outMessages )
|
|
{
|
|
free( peer->outMessages );
|
|
}
|
|
if( peer->status > PEER_STATUS_IDLE )
|
|
{
|
|
tr_netClose( peer->socket );
|
|
tr_fdSocketClosed( tor->fdlimit, 0 );
|
|
}
|
|
free( peer );
|
|
tor->peerCount--;
|
|
memmove( &tor->peers[i], &tor->peers[i+1],
|
|
( tor->peerCount - i ) * sizeof( tr_peer_t * ) );
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerPulse
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
void tr_peerPulse( tr_torrent_t * tor )
|
|
{
|
|
int i, ret, size;
|
|
uint8_t * p;
|
|
tr_peer_t * peer;
|
|
|
|
tor->dates[9] = tr_date();
|
|
if( tor->dates[9] > tor->dates[8] + 1000 )
|
|
{
|
|
memmove( &tor->downloaded[0], &tor->downloaded[1],
|
|
9 * sizeof( uint64_t ) );
|
|
memmove( &tor->uploaded[0], &tor->uploaded[1],
|
|
9 * sizeof( uint64_t ) );
|
|
memmove( &tor->dates[0], &tor->dates[1],
|
|
9 * sizeof( uint64_t ) );
|
|
|
|
for( i = 0; i < tor->peerCount; )
|
|
{
|
|
if( checkPeer( tor, i ) )
|
|
{
|
|
tr_peerRem( tor, i );
|
|
continue;
|
|
}
|
|
i++;
|
|
}
|
|
}
|
|
|
|
if( tor->status & TR_STATUS_STOPPING )
|
|
{
|
|
return;
|
|
}
|
|
|
|
/* Check for incoming connections */
|
|
if( tor->bindSocket > -1 &&
|
|
tor->peerCount < TR_MAX_PEER_COUNT &&
|
|
!tr_fdSocketWillCreate( tor->fdlimit, 0 ) )
|
|
{
|
|
int s;
|
|
struct in_addr addr;
|
|
in_port_t port;
|
|
s = tr_netAccept( tor->bindSocket, &addr, &port );
|
|
if( s > -1 )
|
|
{
|
|
tr_peerAddCompact( tor, addr, port, s );
|
|
}
|
|
else
|
|
{
|
|
tr_fdSocketClosed( tor->fdlimit, 0 );
|
|
}
|
|
}
|
|
|
|
/* Shuffle peers */
|
|
if( tor->peerCount > 1 )
|
|
{
|
|
peer = tor->peers[0];
|
|
memmove( &tor->peers[0], &tor->peers[1],
|
|
( tor->peerCount - 1 ) * sizeof( void * ) );
|
|
tor->peers[tor->peerCount - 1] = peer;
|
|
}
|
|
|
|
/* Handle peers */
|
|
for( i = 0; i < tor->peerCount; )
|
|
{
|
|
peer = tor->peers[i];
|
|
|
|
if( peer->status < PEER_STATUS_HANDSHAKE )
|
|
{
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
/* Try to read */
|
|
for( ;; )
|
|
{
|
|
if( peer->size < 1 )
|
|
{
|
|
peer->size = 1024;
|
|
peer->buf = malloc( peer->size );
|
|
}
|
|
else if( peer->pos >= peer->size )
|
|
{
|
|
peer->size *= 2;
|
|
peer->buf = realloc( peer->buf, peer->size );
|
|
}
|
|
ret = tr_netRecv( peer->socket, &peer->buf[peer->pos],
|
|
peer->size - peer->pos );
|
|
if( ret & TR_NET_CLOSE )
|
|
{
|
|
peer_dbg( "connection closed" );
|
|
goto dropPeer;
|
|
}
|
|
else if( ret & TR_NET_BLOCK )
|
|
{
|
|
break;
|
|
}
|
|
peer->date = tr_date();
|
|
peer->pos += ret;
|
|
if( parseBuf( tor, peer, ret ) )
|
|
{
|
|
goto dropPeer;
|
|
}
|
|
}
|
|
|
|
if( peer->status < PEER_STATUS_CONNECTED )
|
|
{
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
/* Try to write */
|
|
writeBegin:
|
|
|
|
/* Send all smaller messages regardless of the upload cap */
|
|
while( ( p = messagesPending( peer, &size ) ) )
|
|
{
|
|
ret = tr_netSend( peer->socket, p, size );
|
|
if( ret & TR_NET_CLOSE )
|
|
{
|
|
goto dropPeer;
|
|
}
|
|
else if( ret & TR_NET_BLOCK )
|
|
{
|
|
goto writeEnd;
|
|
}
|
|
messagesSent( peer, ret );
|
|
}
|
|
|
|
/* Send pieces if we can */
|
|
while( ( p = blockPending( tor, peer, &size ) ) )
|
|
{
|
|
if( !tr_uploadCanUpload( tor->upload ) )
|
|
{
|
|
break;
|
|
}
|
|
|
|
ret = tr_netSend( peer->socket, p, size );
|
|
if( ret & TR_NET_CLOSE )
|
|
{
|
|
goto dropPeer;
|
|
}
|
|
else if( ret & TR_NET_BLOCK )
|
|
{
|
|
break;
|
|
}
|
|
|
|
blockSent( peer, ret );
|
|
tr_uploadUploaded( tor->upload, ret );
|
|
|
|
tor->uploaded[9] += ret;
|
|
peer->outTotal += ret;
|
|
peer->outDate = tr_date();
|
|
|
|
/* In case this block is done, you may have messages
|
|
pending. Send them before we start the next block */
|
|
goto writeBegin;
|
|
}
|
|
writeEnd:
|
|
|
|
/* Ask for a block whenever possible */
|
|
if( !tr_cpIsSeeding( tor->completion ) &&
|
|
!peer->amInterested && tor->peerCount > TR_MAX_PEER_COUNT - 2 )
|
|
{
|
|
/* This peer is no use to us, and it seems there are
|
|
more */
|
|
peer_dbg( "not interesting" );
|
|
tr_peerRem( tor, i );
|
|
continue;
|
|
}
|
|
|
|
if( peer->amInterested && !peer->peerChoking )
|
|
{
|
|
int block;
|
|
while( peer->inRequestCount < OUR_REQUEST_COUNT )
|
|
{
|
|
block = chooseBlock( tor, peer );
|
|
if( block < 0 )
|
|
{
|
|
break;
|
|
}
|
|
sendRequest( tor, peer, block );
|
|
}
|
|
}
|
|
|
|
i++;
|
|
continue;
|
|
|
|
dropPeer:
|
|
tr_peerRem( tor, i );
|
|
}
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerIsConnected
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
int tr_peerIsConnected( tr_peer_t * peer )
|
|
{
|
|
return peer->status & PEER_STATUS_CONNECTED;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerIsUploading
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
int tr_peerIsUploading( tr_peer_t * peer )
|
|
{
|
|
return ( peer->inRequestCount > 0 );
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerIsDownloading
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
int tr_peerIsDownloading( tr_peer_t * peer )
|
|
{
|
|
return peer->outBlockSending;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* tr_peerBitfield
|
|
***********************************************************************
|
|
*
|
|
**********************************************************************/
|
|
uint8_t * tr_peerBitfield( tr_peer_t * peer )
|
|
{
|
|
return peer->bitfield;
|
|
}
|