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transmission/libtransmission/transmission.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2006 Transmission authors and contributors
*
* 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"
/***********************************************************************
* Local prototypes
**********************************************************************/
static tr_torrent_t * torrentRealInit( tr_handle_t *, tr_torrent_t * tor,
int flags, int * error );
static void torrentReallyStop( tr_torrent_t * );
static void downloadLoop( void * );
static void acceptLoop( void * );
static void acceptStop( tr_handle_t * h );
/***********************************************************************
* tr_init
***********************************************************************
* Allocates a tr_handle_t structure and initializes a few things
**********************************************************************/
tr_handle_t * tr_init()
{
tr_handle_t * h;
int i, r;
tr_netResolveThreadInit();
h = calloc( sizeof( tr_handle_t ), 1 );
/* Generate a peer id : "-TRxxyy-" + 12 random alphanumeric
characters, where xx is the major version number and yy the
minor version number (Azureus-style) */
sprintf( h->id, "-TR%02d%02d-", VERSION_MAJOR, VERSION_MINOR );
for( i = 8; i < 20; i++ )
{
r = tr_rand( 36 );
h->id[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
}
/* Random key */
for( i = 0; i < 20; i++ )
{
r = tr_rand( 36 );
h->key[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
}
/* Don't exit when writing on a broken socket */
signal( SIGPIPE, SIG_IGN );
/* Initialize rate and file descripts controls */
h->upload = tr_rcInit();
h->download = tr_rcInit();
h->fdlimit = tr_fdInit();
h->choking = tr_chokingInit( h );
h->bindPort = -1;
h->bindSocket = -1;
h->acceptDie = 0;
tr_lockInit( &h->acceptLock );
tr_threadCreate( &h->acceptThread, acceptLoop, h );
return h;
}
/***********************************************************************
* tr_setBindPort
***********************************************************************
*
**********************************************************************/
void tr_setBindPort( tr_handle_t * h, int port )
{
int sock = -1;
tr_torrent_t * tor;
if( h->bindPort == port )
return;
#ifndef BEOS_NETSERVER
/* BeOS net_server seems to be unable to set incoming connections to
non-blocking. Too bad. */
if( !tr_fdSocketWillCreate( h->fdlimit, 0 ) )
{
/* XXX should handle failure here in a better way */
sock = tr_netBind( port );
}
#else
return;
#endif
tr_lockLock( &h->acceptLock );
h->bindPort = port;
for( tor = h->torrentList; tor; tor = tor->next )
{
tr_lockLock( &tor->lock );
if( NULL != tor->tracker )
{
tr_trackerChangePort( tor->tracker, port );
}
tr_lockUnlock( &tor->lock );
}
if( h->bindSocket > -1 )
{
tr_netClose( h->bindSocket );
tr_fdSocketClosed( h->fdlimit, 0 );
}
h->bindSocket = sock;
tr_lockUnlock( &h->acceptLock );
}
/***********************************************************************
* tr_setUploadLimit
***********************************************************************
*
**********************************************************************/
void tr_setUploadLimit( tr_handle_t * h, int limit )
{
tr_rcSetLimit( h->upload, limit );
tr_chokingSetLimit( h->choking, limit );
}
/***********************************************************************
* tr_setDownloadLimit
***********************************************************************
*
**********************************************************************/
void tr_setDownloadLimit( tr_handle_t * h, int limit )
{
tr_rcSetLimit( h->download, limit );
}
/***********************************************************************
* tr_torrentRates
***********************************************************************
*
**********************************************************************/
void tr_torrentRates( tr_handle_t * h, float * dl, float * ul )
{
tr_torrent_t * tor;
*dl = 0.0;
*ul = 0.0;
for( tor = h->torrentList; tor; tor = tor->next )
{
tr_lockLock( &tor->lock );
if( tor->status & TR_STATUS_DOWNLOAD )
*dl += tr_rcRate( tor->download );
*ul += tr_rcRate( tor->upload );
tr_lockUnlock( &tor->lock );
}
}
tr_torrent_t * tr_torrentInit( tr_handle_t * h, const char * path,
int flags, int * error )
{
tr_torrent_t * tor = calloc( sizeof( tr_torrent_t ), 1 );
int saveCopy = ( TR_FSAVEPRIVATE & flags );
/* Parse torrent file */
if( tr_metainfoParse( &tor->info, path, NULL, saveCopy ) )
{
*error = TR_EINVALID;
free( tor );
return NULL;
}
return torrentRealInit( h, tor, flags, error );
}
tr_torrent_t * tr_torrentInitSaved( tr_handle_t * h, const char * hashStr,
int flags, int * error )
{
tr_torrent_t * tor = calloc( sizeof( tr_torrent_t ), 1 );
/* Parse torrent file */
if( tr_metainfoParse( &tor->info, NULL, hashStr, 0 ) )
{
*error = TR_EINVALID;
free( tor );
return NULL;
}
return torrentRealInit( h, tor, ( TR_FSAVEPRIVATE | flags ), error );
}
/***********************************************************************
* tr_torrentInit
***********************************************************************
* Allocates a tr_torrent_t structure, then relies on tr_metainfoParse
* to fill it.
**********************************************************************/
static tr_torrent_t * torrentRealInit( tr_handle_t * h, tr_torrent_t * tor,
int flags, int * error )
{
tr_torrent_t * tor_tmp;
tr_info_t * inf;
int i;
char * s1, * s2;
inf = &tor->info;
inf->flags = flags;
/* Make sure this torrent is not already open */
for( tor_tmp = h->torrentList; tor_tmp; tor_tmp = tor_tmp->next )
{
if( !memcmp( tor->info.hash, tor_tmp->info.hash,
SHA_DIGEST_LENGTH ) )
{
*error = TR_EDUPLICATE;
free( tor );
return NULL;
}
}
tor->status = TR_STATUS_PAUSE;
tor->id = h->id;
tor->key = h->key;
tor->bindPort = &h->bindPort;
tor->finished = 0;
/* Guess scrape URL */
s1 = strchr( inf->trackerAnnounce, '/' );
while( ( s2 = strchr( s1 + 1, '/' ) ) )
{
s1 = s2;
}
s1++;
if( !strncmp( s1, "announce", 8 ) )
{
int pre = (long) s1 - (long) inf->trackerAnnounce;
int post = strlen( inf->trackerAnnounce ) - pre - 8;
memcpy( tor->scrape, inf->trackerAnnounce, pre );
sprintf( &tor->scrape[pre], "scrape" );
memcpy( &tor->scrape[pre+6], &inf->trackerAnnounce[pre+8], post );
}
/* Escaped info hash for HTTP queries */
for( i = 0; i < SHA_DIGEST_LENGTH; i++ )
{
sprintf( &tor->hashString[3*i], "%%%02x", inf->hash[i] );
}
/* Block size: usually 16 ko, or less if we have to */
tor->blockSize = MIN( inf->pieceSize, 1 << 14 );
tor->blockCount = ( inf->totalSize + tor->blockSize - 1 ) /
tor->blockSize;
tor->completion = tr_cpInit( tor );
tr_lockInit( &tor->lock );
tor->globalUpload = h->upload;
tor->globalDownload = h->download;
tor->fdlimit = h->fdlimit;
tor->upload = tr_rcInit();
tor->download = tr_rcInit();
/* We have a new torrent */
tr_lockLock( &h->acceptLock );
tor->prev = NULL;
tor->next = h->torrentList;
if( tor->next )
{
tor->next->prev = tor;
}
h->torrentList = tor;
(h->torrentCount)++;
tr_lockUnlock( &h->acceptLock );
if( 0 > h->bindPort )
{
tr_setBindPort( h, TR_DEFAULT_PORT );
}
return tor;
}
tr_info_t * tr_torrentInfo( tr_torrent_t * tor )
{
return &tor->info;
}
/***********************************************************************
* tr_torrentScrape
**********************************************************************/
int tr_torrentScrape( tr_torrent_t * tor, int * s, int * l )
{
return tr_trackerScrape( tor, s, l );
}
void tr_torrentSetFolder( tr_torrent_t * tor, const char * path )
{
tor->destination = strdup( path );
tr_ioLoadResume( tor );
}
char * tr_torrentGetFolder( tr_torrent_t * tor )
{
return tor->destination;
}
void tr_torrentStart( tr_torrent_t * tor )
{
if( tor->status & ( TR_STATUS_STOPPING | TR_STATUS_STOPPED ) )
{
/* Join the thread first */
torrentReallyStop( tor );
}
tor->status = TR_STATUS_CHECK;
tor->tracker = tr_trackerInit( tor );
tor->date = tr_date();
tor->die = 0;
tr_threadCreate( &tor->thread, downloadLoop, tor );
}
void tr_torrentStop( tr_torrent_t * tor )
{
tr_lockLock( &tor->lock );
tr_trackerStopped( tor->tracker );
tr_rcReset( tor->download );
tr_rcReset( tor->upload );
tor->status = TR_STATUS_STOPPING;
tor->stopDate = tr_date();
tr_lockUnlock( &tor->lock );
}
/***********************************************************************
* torrentReallyStop
***********************************************************************
* Joins the download thread and frees/closes everything related to it.
**********************************************************************/
static void torrentReallyStop( tr_torrent_t * tor )
{
tor->die = 1;
tr_threadJoin( &tor->thread );
tr_dbg( "Thread joined" );
tr_trackerClose( tor->tracker );
tor->tracker = NULL;
while( tor->peerCount > 0 )
{
tr_peerRem( tor, 0 );
}
}
/***********************************************************************
* tr_torrentCount
***********************************************************************
*
**********************************************************************/
int tr_torrentCount( tr_handle_t * h )
{
return h->torrentCount;
}
void tr_torrentIterate( tr_handle_t * h, tr_callback_t func, void * d )
{
tr_torrent_t * tor;
for( tor = h->torrentList; tor; tor = tor->next )
{
func( tor, d );
}
}
int tr_getFinished( tr_torrent_t * tor )
{
if( tor->finished )
{
tor->finished = 0;
return 1;
}
return 0;
}
tr_stat_t * tr_torrentStat( tr_torrent_t * tor )
{
tr_stat_t * s;
tr_info_t * inf = &tor->info;
int i;
tor->statCur = ( tor->statCur + 1 ) % 2;
s = &tor->stats[tor->statCur];
if( ( tor->status & TR_STATUS_STOPPED ) ||
( ( tor->status & TR_STATUS_STOPPING ) &&
tr_date() > tor->stopDate + 60000 ) )
{
torrentReallyStop( tor );
tor->status = TR_STATUS_PAUSE;
}
tr_lockLock( &tor->lock );
s->status = tor->status;
s->error = tor->error;
memcpy( s->trackerError, tor->trackerError,
sizeof( s->trackerError ) );
s->peersTotal = 0;
s->peersUploading = 0;
s->peersDownloading = 0;
for( i = 0; i < tor->peerCount; i++ )
{
if( tr_peerIsConnected( tor->peers[i] ) )
{
(s->peersTotal)++;
if( tr_peerIsUploading( tor->peers[i] ) )
{
(s->peersUploading)++;
}
if( tr_peerIsDownloading( tor->peers[i] ) )
{
(s->peersDownloading)++;
}
}
}
s->progress = tr_cpCompletionAsFloat( tor->completion );
if( tor->status & TR_STATUS_DOWNLOAD )
s->rateDownload = tr_rcRate( tor->download );
else
/* tr_rcRate() doesn't make the difference between 'piece'
messages and other messages, which causes a non-zero
download rate even tough we are not downloading. So we
force it to zero not to confuse the user. */
s->rateDownload = 0.0;
s->rateUpload = tr_rcRate( tor->upload );
s->seeders = tr_trackerSeeders(tor->tracker);
s->leechers = tr_trackerLeechers(tor->tracker);
if( s->rateDownload < 0.1 )
{
s->eta = -1;
}
else
{
s->eta = (float) ( 1.0 - s->progress ) *
(float) inf->totalSize / s->rateDownload / 1024.0;
if( s->eta > 99 * 3600 + 59 * 60 + 59 )
{
s->eta = -1;
}
}
s->downloaded = tor->downloaded;
s->uploaded = tor->uploaded;
tr_lockUnlock( &tor->lock );
return s;
}
void tr_torrentAvailability( tr_torrent_t * tor, int8_t * tab, int size )
{
int i, j, piece;
tr_lockLock( &tor->lock );
for( i = 0; i < size; i++ )
{
piece = i * tor->info.pieceCount / size;
if( tr_cpPieceIsComplete( tor->completion, piece ) )
{
tab[i] = -1;
continue;
}
tab[i] = 0;
for( j = 0; j < tor->peerCount; j++ )
{
if( tr_peerBitfield( tor->peers[j] ) &&
tr_bitfieldHas( tr_peerBitfield( tor->peers[j] ), piece ) )
{
(tab[i])++;
}
}
}
tr_lockUnlock( &tor->lock );
}
void tr_torrentRemoveSaved( tr_torrent_t * tor ) {
tr_metainfoRemoveSaved( tor->info.hashString );
}
/***********************************************************************
* tr_torrentClose
***********************************************************************
* Frees memory allocated by tr_torrentInit.
**********************************************************************/
void tr_torrentClose( tr_handle_t * h, tr_torrent_t * tor )
{
tr_info_t * inf = &tor->info;
if( tor->status & ( TR_STATUS_STOPPING | TR_STATUS_STOPPED ) )
{
/* Join the thread first */
torrentReallyStop( tor );
}
tr_lockLock( &h->acceptLock );
h->torrentCount--;
tr_lockClose( &tor->lock );
tr_cpClose( tor->completion );
tr_rcClose( tor->upload );
tr_rcClose( tor->download );
if( tor->destination )
{
free( tor->destination );
}
free( inf->pieces );
free( inf->files );
if( tor->prev )
{
tor->prev->next = tor->next;
}
else
{
h->torrentList = tor->next;
}
if( tor->next )
{
tor->next->prev = tor->prev;
}
free( tor );
tr_lockUnlock( &h->acceptLock );
}
void tr_close( tr_handle_t * h )
{
acceptStop( h );
tr_chokingClose( h->choking );
tr_fdClose( h->fdlimit );
tr_rcClose( h->upload );
tr_rcClose( h->download );
free( h );
tr_netResolveThreadClose();
}
/***********************************************************************
* downloadLoop
**********************************************************************/
static void downloadLoop( void * _tor )
{
tr_torrent_t * tor = _tor;
uint64_t date1, date2;
tr_dbg( "Thread started" );
#ifdef SYS_BEOS
/* This is required because on BeOS, SIGINT is sent to each thread,
which kills them not nicely */
signal( SIGINT, SIG_IGN );
#endif
tr_lockLock( &tor->lock );
tr_cpReset( tor->completion );
tor->io = tr_ioInit( tor );
tor->status = tr_cpIsSeeding( tor->completion ) ?
TR_STATUS_SEED : TR_STATUS_DOWNLOAD;
while( !tor->die )
{
date1 = tr_date();
/* Are we finished ? */
if( ( tor->status & TR_STATUS_DOWNLOAD ) &&
tr_cpIsSeeding( tor->completion ) )
{
/* Done */
tor->status = TR_STATUS_SEED;
tor->finished = 1;
tr_trackerCompleted( tor->tracker );
tr_ioSaveResume( tor->io );
sync(); /* KLUDGE: all files should be closed and
re-opened in read-only mode instead */
}
/* Receive/send messages */
tr_peerPulse( tor );
/* Try to get new peers or to send a message to the tracker */
tr_trackerPulse( tor->tracker );
if( tor->status & TR_STATUS_STOPPED )
{
break;
}
/* Wait up to 20 ms */
date2 = tr_date();
if( date2 < date1 + 20 )
{
tr_lockUnlock( &tor->lock );
tr_wait( date1 + 20 - date2 );
tr_lockLock( &tor->lock );
}
}
tr_lockUnlock( &tor->lock );
tr_ioClose( tor->io );
tor->status = TR_STATUS_STOPPED;
tr_dbg( "Thread exited" );
}
/***********************************************************************
* acceptLoop
**********************************************************************/
static void acceptLoop( void * _h )
{
tr_handle_t * h = _h;
uint64_t date1, date2, lastchoke = 0;
int ii;
uint8_t * hash;
tr_torrent_t * tor;
tr_dbg( "Accept thread started" );
#ifdef SYS_BEOS
/* This is required because on BeOS, SIGINT is sent to each thread,
which kills them not nicely */
signal( SIGINT, SIG_IGN );
#endif
tr_lockLock( &h->acceptLock );
while( !h->acceptDie )
{
date1 = tr_date();
/* Check for incoming connections */
if( h->bindSocket > -1 &&
h->acceptPeerCount < TR_MAX_PEER_COUNT &&
!tr_fdSocketWillCreate( h->fdlimit, 0 ) )
{
int s;
struct in_addr addr;
in_port_t port;
s = tr_netAccept( h->bindSocket, &addr, &port );
if( s > -1 )
{
h->acceptPeers[h->acceptPeerCount++] = tr_peerInit( addr, port, s );
}
else
{
tr_fdSocketClosed( h->fdlimit, 0 );
}
}
for( ii = 0; ii < h->acceptPeerCount; )
{
if( tr_peerRead( NULL, h->acceptPeers[ii] ) )
{
tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
goto removePeer;
}
if( NULL != ( hash = tr_peerHash( h->acceptPeers[ii] ) ) )
{
for( tor = h->torrentList; tor; tor = tor->next )
{
tr_lockLock( &tor->lock );
if( 0 == memcmp( tor->info.hash, hash,
SHA_DIGEST_LENGTH ) )
{
tr_peerAttach( tor, h->acceptPeers[ii] );
tr_lockUnlock( &tor->lock );
goto removePeer;
}
tr_lockUnlock( &tor->lock );
}
tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
goto removePeer;
}
if( date1 > tr_peerDate( h->acceptPeers[ii] ) + 10000 )
{
/* Give them 10 seconds to send the handshake */
tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
goto removePeer;
}
ii++;
continue;
removePeer:
h->acceptPeerCount--;
memmove( &h->acceptPeers[ii], &h->acceptPeers[ii+1],
( h->acceptPeerCount - ii ) * sizeof( tr_peer_t * ) );
}
if( date1 > lastchoke + 2000 )
{
tr_chokingPulse( h->choking );
lastchoke = date1;
}
/* Wait up to 20 ms */
date2 = tr_date();
if( date2 < date1 + 20 )
{
tr_lockUnlock( &h->acceptLock );
tr_wait( date1 + 20 - date2 );
tr_lockLock( &h->acceptLock );
}
}
tr_lockUnlock( &h->acceptLock );
tr_dbg( "Accept thread exited" );
}
/***********************************************************************
* acceptStop
***********************************************************************
* Joins the accept thread and frees/closes everything related to it.
**********************************************************************/
static void acceptStop( tr_handle_t * h )
{
int ii;
h->acceptDie = 1;
tr_threadJoin( &h->acceptThread );
tr_lockClose( &h->acceptLock );
tr_dbg( "Accept thread joined" );
for( ii = 0; ii < h->acceptPeerCount; ii++ )
{
tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
}
if( h->bindSocket > -1 )
{
tr_netClose( h->bindSocket );
tr_fdSocketClosed( h->fdlimit, 0 );
}
}
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