source: trunk/libtransmission/transmission.c @ 346

Last change on this file since 346 was 346, checked in by titer, 15 years ago

Fixes #22 (all torrents apparently at 0 % when T restarts)

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1/******************************************************************************
2 * $Id: transmission.c 346 2006-06-13 00:28:03Z titer $
3 *
4 * Copyright (c) 2005-2006 Transmission authors and contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *****************************************************************************/
24
25#include "transmission.h"
26
27/***********************************************************************
28 * Local prototypes
29 **********************************************************************/
30static tr_torrent_t * torrentRealInit( tr_handle_t *, tr_torrent_t * tor,
31                                       int flags, int * error );
32static void torrentReallyStop( tr_torrent_t * );
33static void  downloadLoop( void * );
34static void  acceptLoop( void * );
35static void acceptStop( tr_handle_t * h );
36
37/***********************************************************************
38 * tr_init
39 ***********************************************************************
40 * Allocates a tr_handle_t structure and initializes a few things
41 **********************************************************************/
42tr_handle_t * tr_init()
43{
44    tr_handle_t * h;
45    int           i, r;
46
47    tr_netResolveThreadInit();
48
49    h = calloc( sizeof( tr_handle_t ), 1 );
50
51    /* Generate a peer id : "-TRxxyy-" + 12 random alphanumeric
52       characters, where xx is the major version number and yy the
53       minor version number (Azureus-style) */
54    sprintf( h->id, "-TR%02d%02d-", VERSION_MAJOR, VERSION_MINOR );
55    for( i = 8; i < 20; i++ )
56    {
57        r        = tr_rand( 36 );
58        h->id[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
59    }
60
61    /* Random key */
62    for( i = 0; i < 20; i++ )
63    {
64        r         = tr_rand( 36 );
65        h->key[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
66    }
67
68    /* Don't exit when writing on a broken socket */
69    signal( SIGPIPE, SIG_IGN );
70
71    /* Initialize rate and file descripts controls */
72    h->upload   = tr_rcInit();
73    h->download = tr_rcInit();
74    h->fdlimit  = tr_fdInit();
75    h->choking  = tr_chokingInit( h );
76
77    h->bindPort = -1;
78    h->bindSocket = -1;
79
80    h->acceptDie = 0;
81    tr_lockInit( &h->acceptLock );
82    tr_threadCreate( &h->acceptThread, acceptLoop, h );
83
84    return h;
85}
86
87/***********************************************************************
88 * tr_setBindPort
89 ***********************************************************************
90 *
91 **********************************************************************/
92void tr_setBindPort( tr_handle_t * h, int port )
93{
94    int sock = -1;
95    tr_torrent_t * tor;
96
97    if( h->bindPort == port )
98      return;
99
100#ifndef BEOS_NETSERVER
101    /* BeOS net_server seems to be unable to set incoming connections to
102       non-blocking. Too bad. */
103    if( !tr_fdSocketWillCreate( h->fdlimit, 0 ) )
104    {
105        /* XXX should handle failure here in a better way */
106        sock = tr_netBind( port );
107    }
108#else
109    return;
110#endif
111
112    tr_lockLock( &h->acceptLock );
113
114    h->bindPort = port;
115
116    for( tor = h->torrentList; tor; tor = tor->next )
117    {
118        tr_lockLock( &tor->lock );
119        if( NULL != tor->tracker )
120        {
121            tr_trackerChangePort( tor->tracker, port );
122        }
123        tr_lockUnlock( &tor->lock );
124    }
125
126    if( h->bindSocket > -1 )
127    {
128        tr_netClose( h->bindSocket );
129        tr_fdSocketClosed( h->fdlimit, 0 );
130    }
131
132    h->bindSocket = sock;
133
134    tr_lockUnlock( &h->acceptLock );
135}
136
137/***********************************************************************
138 * tr_setUploadLimit
139 ***********************************************************************
140 *
141 **********************************************************************/
142void tr_setUploadLimit( tr_handle_t * h, int limit )
143{
144    tr_rcSetLimit( h->upload, limit );
145    tr_chokingSetLimit( h->choking, limit );
146}
147
148/***********************************************************************
149 * tr_setDownloadLimit
150 ***********************************************************************
151 *
152 **********************************************************************/
153void tr_setDownloadLimit( tr_handle_t * h, int limit )
154{
155    tr_rcSetLimit( h->download, limit );
156}
157
158/***********************************************************************
159 * tr_torrentRates
160 ***********************************************************************
161 *
162 **********************************************************************/
163void tr_torrentRates( tr_handle_t * h, float * dl, float * ul )
164{
165    tr_torrent_t * tor;
166
167    *dl = 0.0;
168    *ul = 0.0;
169    for( tor = h->torrentList; tor; tor = tor->next )
170    {
171        tr_lockLock( &tor->lock );
172        if( tor->status & TR_STATUS_DOWNLOAD )
173            *dl += tr_rcRate( tor->download );
174        *ul += tr_rcRate( tor->upload );
175        tr_lockUnlock( &tor->lock );
176    }
177}
178
179tr_torrent_t * tr_torrentInit( tr_handle_t * h, const char * path,
180                               int flags, int * error )
181{
182    tr_torrent_t  * tor = calloc( sizeof( tr_torrent_t ), 1 );
183    int             saveCopy = ( TR_FSAVEPRIVATE & flags );
184
185    /* Parse torrent file */
186    if( tr_metainfoParse( &tor->info, path, NULL, saveCopy ) )
187    {
188        *error = TR_EINVALID;
189        free( tor );
190        return NULL;
191    }
192
193    return torrentRealInit( h, tor, flags, error );
194}
195
196tr_torrent_t * tr_torrentInitSaved( tr_handle_t * h, const char * hashStr,
197                                    int flags, int * error )
198{
199    tr_torrent_t  * tor = calloc( sizeof( tr_torrent_t ), 1 );
200
201    /* Parse torrent file */
202    if( tr_metainfoParse( &tor->info, NULL, hashStr, 0 ) )
203    {
204        *error = TR_EINVALID;
205        free( tor );
206        return NULL;
207    }
208
209    return torrentRealInit( h, tor, ( TR_FSAVEPRIVATE | flags ), error );
210}
211
212/***********************************************************************
213 * tr_torrentInit
214 ***********************************************************************
215 * Allocates a tr_torrent_t structure, then relies on tr_metainfoParse
216 * to fill it.
217 **********************************************************************/
218static tr_torrent_t * torrentRealInit( tr_handle_t * h, tr_torrent_t * tor,
219                                       int flags, int * error )
220{
221    tr_torrent_t  * tor_tmp;
222    tr_info_t     * inf;
223    int             i;
224    char          * s1, * s2;
225
226    inf        = &tor->info;
227    inf->flags = flags;
228
229    /* Make sure this torrent is not already open */
230    for( tor_tmp = h->torrentList; tor_tmp; tor_tmp = tor_tmp->next )
231    {
232        if( !memcmp( tor->info.hash, tor_tmp->info.hash,
233                     SHA_DIGEST_LENGTH ) )
234        {
235            *error = TR_EDUPLICATE;
236            free( tor );
237            return NULL;
238        }
239    }
240
241    tor->status = TR_STATUS_PAUSE;
242    tor->id     = h->id;
243    tor->key    = h->key;
244    tor->bindPort = &h->bindPort;
245        tor->finished = 0;
246
247
248    /* Guess scrape URL */
249    s1 = strchr( inf->trackerAnnounce, '/' );
250    while( ( s2 = strchr( s1 + 1, '/' ) ) )
251    {
252        s1 = s2;
253    }
254    s1++;
255    if( !strncmp( s1, "announce", 8 ) )
256    {
257        int pre  = (long) s1 - (long) inf->trackerAnnounce;
258        int post = strlen( inf->trackerAnnounce ) - pre - 8;
259        memcpy( tor->scrape, inf->trackerAnnounce, pre );
260        sprintf( &tor->scrape[pre], "scrape" );
261        memcpy( &tor->scrape[pre+6], &inf->trackerAnnounce[pre+8], post );
262    }
263
264    /* Escaped info hash for HTTP queries */
265    for( i = 0; i < SHA_DIGEST_LENGTH; i++ )
266    {
267        sprintf( &tor->hashString[3*i], "%%%02x", inf->hash[i] );
268    }
269
270    /* Block size: usually 16 ko, or less if we have to */
271    tor->blockSize  = MIN( inf->pieceSize, 1 << 14 );
272    tor->blockCount = ( inf->totalSize + tor->blockSize - 1 ) /
273                        tor->blockSize;
274    tor->completion = tr_cpInit( tor );
275
276    tr_lockInit( &tor->lock );
277
278    tor->globalUpload   = h->upload;
279    tor->globalDownload = h->download;
280    tor->fdlimit        = h->fdlimit;
281    tor->upload         = tr_rcInit();
282    tor->download       = tr_rcInit();
283 
284    /* We have a new torrent */
285    tr_lockLock( &h->acceptLock );
286    tor->prev = NULL;
287    tor->next = h->torrentList;
288    if( tor->next )
289    {
290        tor->next->prev = tor;
291    }
292    h->torrentList = tor;
293    (h->torrentCount)++;
294    tr_lockUnlock( &h->acceptLock );
295
296    if( 0 > h->bindPort )
297    {
298        tr_setBindPort( h, TR_DEFAULT_PORT );
299    }
300
301    return tor;
302}
303
304tr_info_t * tr_torrentInfo( tr_torrent_t * tor )
305{
306    return &tor->info;
307}
308
309/***********************************************************************
310 * tr_torrentScrape
311 **********************************************************************/
312int tr_torrentScrape( tr_torrent_t * tor, int * s, int * l )
313{
314    return tr_trackerScrape( tor, s, l );
315}
316
317void tr_torrentSetFolder( tr_torrent_t * tor, const char * path )
318{
319    tor->destination = strdup( path );
320    tr_ioLoadResume( tor );
321}
322
323char * tr_torrentGetFolder( tr_torrent_t * tor )
324{
325    return tor->destination;
326}
327
328void tr_torrentStart( tr_torrent_t * tor )
329{
330    if( tor->status & ( TR_STATUS_STOPPING | TR_STATUS_STOPPED ) )
331    {
332        /* Join the thread first */
333        torrentReallyStop( tor );
334    }
335
336    tor->status  = TR_STATUS_CHECK;
337
338    tor->date = tr_date();
339    tor->die = 0;
340    tr_threadCreate( &tor->thread, downloadLoop, tor );
341}
342
343void tr_torrentStop( tr_torrent_t * tor )
344{
345    tr_lockLock( &tor->lock );
346    tr_trackerStopped( tor->tracker );
347    tr_rcReset( tor->download );
348    tr_rcReset( tor->upload );
349    tor->status = TR_STATUS_STOPPING;
350    tor->stopDate = tr_date();
351    tr_lockUnlock( &tor->lock );
352}
353
354/***********************************************************************
355 * torrentReallyStop
356 ***********************************************************************
357 * Joins the download thread and frees/closes everything related to it.
358 **********************************************************************/
359static void torrentReallyStop( tr_torrent_t * tor )
360{
361    tor->die = 1;
362    tr_threadJoin( &tor->thread );
363    tr_dbg( "Thread joined" );
364
365    tr_trackerClose( tor->tracker );
366    tor->tracker = NULL;
367
368    while( tor->peerCount > 0 )
369    {
370        tr_peerRem( tor, 0 );
371    }
372}
373
374/***********************************************************************
375 * tr_torrentCount
376 ***********************************************************************
377 *
378 **********************************************************************/
379int tr_torrentCount( tr_handle_t * h )
380{
381    return h->torrentCount;
382}
383
384void tr_torrentIterate( tr_handle_t * h, tr_callback_t func, void * d )
385{
386    tr_torrent_t * tor;
387
388    for( tor = h->torrentList; tor; tor = tor->next )
389    {
390        func( tor, d );
391    }
392}
393
394int tr_getFinished( tr_torrent_t * tor )
395{
396    if( tor->finished )
397    {
398        tor->finished = 0;
399        return 1;
400    }
401    return 0;
402}
403
404tr_stat_t * tr_torrentStat( tr_torrent_t * tor )
405{
406    tr_stat_t * s;
407    tr_info_t * inf = &tor->info;
408    int i;
409
410    tor->statCur = ( tor->statCur + 1 ) % 2;
411    s = &tor->stats[tor->statCur];
412
413    if( ( tor->status & TR_STATUS_STOPPED ) ||
414        ( ( tor->status & TR_STATUS_STOPPING ) &&
415          tr_date() > tor->stopDate + 60000 ) )
416    {
417        torrentReallyStop( tor );
418        tor->status = TR_STATUS_PAUSE;
419    }
420
421    tr_lockLock( &tor->lock );
422
423    s->status = tor->status;
424    s->error  = tor->error;
425    memcpy( s->trackerError, tor->trackerError,
426            sizeof( s->trackerError ) );
427
428    s->peersTotal       = 0;
429    s->peersUploading   = 0;
430    s->peersDownloading = 0;
431
432    for( i = 0; i < tor->peerCount; i++ )
433    {
434        if( tr_peerIsConnected( tor->peers[i] ) )
435        {
436            (s->peersTotal)++;
437            if( tr_peerIsUploading( tor->peers[i] ) )
438            {
439                (s->peersUploading)++;
440            }
441            if( tr_peerIsDownloading( tor->peers[i] ) )
442            {
443                (s->peersDownloading)++;
444            }
445        }
446    }
447
448    s->progress = tr_cpCompletionAsFloat( tor->completion );
449    if( tor->status & TR_STATUS_DOWNLOAD )
450        s->rateDownload = tr_rcRate( tor->download );
451    else
452        /* tr_rcRate() doesn't make the difference between 'piece'
453           messages and other messages, which causes a non-zero
454           download rate even tough we are not downloading. So we
455           force it to zero not to confuse the user. */
456        s->rateDownload = 0.0;
457    s->rateUpload = tr_rcRate( tor->upload );
458   
459    s->seeders  = tr_trackerSeeders(tor->tracker);
460        s->leechers = tr_trackerLeechers(tor->tracker);
461
462    if( s->rateDownload < 0.1 )
463    {
464        s->eta = -1;
465    }
466    else
467    {
468        s->eta = (float) ( 1.0 - s->progress ) *
469            (float) inf->totalSize / s->rateDownload / 1024.0;
470        if( s->eta > 99 * 3600 + 59 * 60 + 59 )
471        {
472            s->eta = -1;
473        }
474    }
475
476    s->downloaded = tor->downloaded;
477    s->uploaded   = tor->uploaded;
478
479    tr_lockUnlock( &tor->lock );
480
481    return s;
482}
483
484void tr_torrentAvailability( tr_torrent_t * tor, int8_t * tab, int size )
485{
486    int i, j, piece;
487
488    tr_lockLock( &tor->lock );
489    for( i = 0; i < size; i++ )
490    {
491        piece = i * tor->info.pieceCount / size;
492
493        if( tr_cpPieceIsComplete( tor->completion, piece ) )
494        {
495            tab[i] = -1;
496            continue;
497        }
498
499        tab[i] = 0;
500        for( j = 0; j < tor->peerCount; j++ )
501        {
502            if( tr_peerBitfield( tor->peers[j] ) &&
503                tr_bitfieldHas( tr_peerBitfield( tor->peers[j] ), piece ) )
504            {
505                (tab[i])++;
506            }
507        }
508    }
509    tr_lockUnlock( &tor->lock );
510}
511
512void tr_torrentRemoveSaved( tr_torrent_t * tor ) {
513    tr_metainfoRemoveSaved( tor->info.hashString );
514}
515
516/***********************************************************************
517 * tr_torrentClose
518 ***********************************************************************
519 * Frees memory allocated by tr_torrentInit.
520 **********************************************************************/
521void tr_torrentClose( tr_handle_t * h, tr_torrent_t * tor )
522{
523    tr_info_t * inf = &tor->info;
524
525    if( tor->status & ( TR_STATUS_STOPPING | TR_STATUS_STOPPED ) )
526    {
527        /* Join the thread first */
528        torrentReallyStop( tor );
529    }
530
531    tr_lockLock( &h->acceptLock );
532
533    h->torrentCount--;
534
535    tr_lockClose( &tor->lock );
536    tr_cpClose( tor->completion );
537
538    tr_rcClose( tor->upload );
539    tr_rcClose( tor->download );
540
541    if( tor->destination )
542    {
543        free( tor->destination );
544    }
545    free( inf->pieces );
546    free( inf->files );
547
548    if( tor->prev )
549    {
550        tor->prev->next = tor->next;
551    }
552    else
553    {
554        h->torrentList = tor->next;
555    }
556    if( tor->next )
557    {
558        tor->next->prev = tor->prev;
559    }
560    free( tor );
561
562    tr_lockUnlock( &h->acceptLock );
563}
564
565void tr_close( tr_handle_t * h )
566{
567    acceptStop( h );
568    tr_chokingClose( h->choking );
569    tr_fdClose( h->fdlimit );
570    tr_rcClose( h->upload );
571    tr_rcClose( h->download );
572    free( h );
573
574    tr_netResolveThreadClose();
575}
576
577/***********************************************************************
578 * downloadLoop
579 **********************************************************************/
580static void downloadLoop( void * _tor )
581{
582    tr_torrent_t * tor = _tor;
583    uint64_t       date1, date2;
584
585    tr_dbg( "Thread started" );
586
587#ifdef SYS_BEOS
588    /* This is required because on BeOS, SIGINT is sent to each thread,
589       which kills them not nicely */
590    signal( SIGINT, SIG_IGN );
591#endif
592
593    tr_lockLock( &tor->lock );
594
595    tr_cpReset( tor->completion );
596    tor->io     = tr_ioInit( tor );
597    tor->status = tr_cpIsSeeding( tor->completion ) ?
598                      TR_STATUS_SEED : TR_STATUS_DOWNLOAD;
599    tor->tracker = tr_trackerInit( tor );
600
601    while( !tor->die )
602    {
603        date1 = tr_date();
604
605        /* Are we finished ? */
606        if( ( tor->status & TR_STATUS_DOWNLOAD ) &&
607            tr_cpIsSeeding( tor->completion ) )
608        {
609            /* Done */
610            tor->status = TR_STATUS_SEED;
611                        tor->finished = 1;
612            tr_trackerCompleted( tor->tracker );
613            tr_ioSaveResume( tor->io );
614        }
615
616        /* Receive/send messages */
617        tr_peerPulse( tor );
618
619        /* Try to get new peers or to send a message to the tracker */
620        tr_trackerPulse( tor->tracker );
621
622        if( tor->status & TR_STATUS_STOPPED )
623        {
624            break;
625        }
626
627        /* Wait up to 20 ms */
628        date2 = tr_date();
629        if( date2 < date1 + 20 )
630        {
631            tr_lockUnlock( &tor->lock );
632            tr_wait( date1 + 20 - date2 );
633            tr_lockLock( &tor->lock );
634        }
635    }
636
637    tr_lockUnlock( &tor->lock );
638
639    tr_ioClose( tor->io );
640
641    tor->status = TR_STATUS_STOPPED;
642
643    tr_dbg( "Thread exited" );
644}
645
646/***********************************************************************
647 * acceptLoop
648 **********************************************************************/
649static void acceptLoop( void * _h )
650{
651    tr_handle_t * h = _h;
652    uint64_t      date1, date2, lastchoke = 0;
653    int           ii;
654    uint8_t     * hash;
655    tr_torrent_t * tor;
656
657    tr_dbg( "Accept thread started" );
658
659#ifdef SYS_BEOS
660    /* This is required because on BeOS, SIGINT is sent to each thread,
661       which kills them not nicely */
662    signal( SIGINT, SIG_IGN );
663#endif
664
665    tr_lockLock( &h->acceptLock );
666
667    while( !h->acceptDie )
668    {
669        date1 = tr_date();
670
671        /* Check for incoming connections */
672        if( h->bindSocket > -1 &&
673            h->acceptPeerCount < TR_MAX_PEER_COUNT &&
674            !tr_fdSocketWillCreate( h->fdlimit, 0 ) )
675        {
676            int            s;
677            struct in_addr addr;
678            in_port_t      port;
679            s = tr_netAccept( h->bindSocket, &addr, &port );
680            if( s > -1 )
681            {
682                h->acceptPeers[h->acceptPeerCount++] = tr_peerInit( addr, port, s );
683            }
684            else
685            {
686                tr_fdSocketClosed( h->fdlimit, 0 );
687            }
688        }
689
690        for( ii = 0; ii < h->acceptPeerCount; )
691        {
692            if( tr_peerRead( NULL, h->acceptPeers[ii] ) )
693            {
694                tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
695                goto removePeer;
696            }
697            if( NULL != ( hash = tr_peerHash( h->acceptPeers[ii] ) ) )
698            {
699                for( tor = h->torrentList; tor; tor = tor->next )
700                {
701                    tr_lockLock( &tor->lock );
702                    if( 0 == memcmp( tor->info.hash, hash,
703                                     SHA_DIGEST_LENGTH ) )
704                    {
705                      tr_peerAttach( tor, h->acceptPeers[ii] );
706                      tr_lockUnlock( &tor->lock );
707                      goto removePeer;
708                    }
709                    tr_lockUnlock( &tor->lock );
710                }
711                tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
712                goto removePeer;
713            }
714            if( date1 > tr_peerDate( h->acceptPeers[ii] ) + 10000 )
715            {
716                /* Give them 10 seconds to send the handshake */
717                tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
718                goto removePeer;
719            }
720            ii++;
721            continue;
722           removePeer:
723            h->acceptPeerCount--;
724            memmove( &h->acceptPeers[ii], &h->acceptPeers[ii+1],
725                     ( h->acceptPeerCount - ii ) * sizeof( tr_peer_t * ) );
726        }
727
728        if( date1 > lastchoke + 2000 )
729        {
730            tr_chokingPulse( h->choking );
731            lastchoke = date1;
732        }
733
734        /* Wait up to 20 ms */
735        date2 = tr_date();
736        if( date2 < date1 + 20 )
737        {
738            tr_lockUnlock( &h->acceptLock );
739            tr_wait( date1 + 20 - date2 );
740            tr_lockLock( &h->acceptLock );
741        }
742    }
743
744    tr_lockUnlock( &h->acceptLock );
745
746    tr_dbg( "Accept thread exited" );
747}
748
749/***********************************************************************
750 * acceptStop
751 ***********************************************************************
752 * Joins the accept thread and frees/closes everything related to it.
753 **********************************************************************/
754static void acceptStop( tr_handle_t * h )
755{
756    int ii;
757
758    h->acceptDie = 1;
759    tr_threadJoin( &h->acceptThread );
760    tr_lockClose( &h->acceptLock );
761    tr_dbg( "Accept thread joined" );
762
763    for( ii = 0; ii < h->acceptPeerCount; ii++ )
764    {
765        tr_peerDestroy( h->fdlimit, h->acceptPeers[ii] );
766    }
767
768    if( h->bindSocket > -1 )
769    {
770        tr_netClose( h->bindSocket );
771        tr_fdSocketClosed( h->fdlimit, 0 );
772    }
773}
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