source: trunk/libtransmission/transmission.c @ 3254

Last change on this file since 3254 was 3254, checked in by charles, 15 years ago

simplify libT locks now that it's (more-or-less) single-threaded. fix deadlocks. make tr_locks nestable.

  • Property svn:keywords set to Date Rev Author Id
File size: 9.2 KB
Line 
1/******************************************************************************
2 * $Id: transmission.c 3254 2007-10-01 15:17:15Z charles $
3 *
4 * Copyright (c) 2005-2007 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 <assert.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29
30#include <signal.h>
31#include <sys/types.h> /* stat */
32#include <sys/stat.h> /* stat */
33#include <unistd.h> /* stat */
34#include <dirent.h> /* opendir */
35
36#include "transmission.h"
37#include "fdlimit.h"
38#include "list.h"
39#include "net.h"
40#include "peer-mgr.h"
41#include "platform.h"
42#include "ratecontrol.h"
43#include "shared.h"
44#include "trevent.h"
45#include "utils.h"
46
47/* Generate a peer id : "-TRxyzb-" + 12 random alphanumeric
48   characters, where x is the major version number, y is the
49   minor version number, z is the maintenance number, and b
50   designates beta (Azureus-style) */
51void
52tr_peerIdNew ( char * buf, int buflen )
53{
54    int i;
55    assert( buflen == TR_ID_LEN + 1 );
56
57    snprintf( buf, TR_ID_LEN, "%s", PEERID_PREFIX );
58    assert( strlen(buf) == 8 );
59    for( i=8; i<TR_ID_LEN; ++i ) {
60        const int r = tr_rand( 36 );
61        buf[i] = ( r < 26 ) ? ( 'a' + r ) : ( '0' + r - 26 ) ;
62    }
63    buf[TR_ID_LEN] = '\0';
64}
65
66const char*
67getPeerId( void )
68{
69    static char * peerId = NULL;
70    if( !peerId ) {
71        peerId = tr_new0( char, TR_ID_LEN + 1 );
72        tr_peerIdNew( peerId, TR_ID_LEN + 1 );
73    }
74    return peerId;
75}
76
77/***
78****
79***/
80
81tr_encryption_mode
82tr_getEncryptionMode( tr_handle * handle )
83{
84    assert( handle != NULL );
85
86    return handle->encryptionMode;
87}
88
89void
90tr_setEncryptionMode( tr_handle * handle, tr_encryption_mode mode )
91{
92    assert( handle != NULL );
93    assert( mode==TR_ENCRYPTION_PREFERRED || mode==TR_ENCRYPTION_REQUIRED );
94
95    handle->encryptionMode = mode;
96}
97
98/***
99****
100***/
101
102
103/***********************************************************************
104 * tr_init
105 ***********************************************************************
106 * Allocates a tr_handle structure and initializes a few things
107 **********************************************************************/
108tr_handle * tr_init( const char * tag )
109{
110    tr_handle * h;
111    int         i;
112
113#ifndef WIN32
114    /* Don't exit when writing on a broken socket */
115    signal( SIGPIPE, SIG_IGN );
116#endif
117
118    tr_msgInit();
119
120    h = tr_new0( tr_handle, 1 );
121    if( !h )
122        return NULL;
123
124    h->lock = tr_lockNew( );
125
126    h->encryptionMode = TR_ENCRYPTION_PREFERRED;
127
128    tr_netInit(); /* must go before tr_eventInit */
129
130    tr_eventInit( h );
131    while( !h->events )
132        tr_wait( 50 );
133
134    h->tag = strdup( tag );
135    if( !h->tag ) {
136        free( h );
137        return NULL;
138    }
139
140    h->peerMgr = tr_peerMgrNew( h );
141
142    /* Azureus identity */
143    for( i=0; i < TR_AZ_ID_LEN; ++i )
144        h->azId[i] = tr_rand( 0xff );
145
146    /* Initialize rate and file descripts controls */
147    h->upload   = tr_rcInit();
148    h->download = tr_rcInit();
149
150    tr_fdInit();
151    h->shared = tr_sharedInit( h );
152
153    tr_inf( TR_NAME " " LONG_VERSION_STRING " started" );
154
155    return h;
156}
157
158/***
159****
160***/
161
162void
163tr_globalLock( struct tr_handle * handle )
164{
165    tr_lockLock( handle->lock );
166}
167
168void
169tr_globalUnlock( struct tr_handle * handle )
170{
171    tr_lockUnlock( handle->lock );
172}
173
174int
175tr_globalIsLocked( const struct tr_handle * handle )
176{
177    return tr_lockHave( handle->lock );
178}
179
180/***********************************************************************
181 * tr_setBindPort
182 ***********************************************************************
183 *
184 **********************************************************************/
185void tr_setBindPort( tr_handle * h, int port )
186{
187    h->isPortSet = 1;
188    tr_sharedSetPort( h->shared, port );
189}
190
191int
192tr_getPublicPort( const tr_handle * h )
193{
194    assert( h != NULL );
195    return tr_sharedGetPublicPort( h->shared );
196}
197
198void tr_natTraversalEnable( tr_handle * h, int enable )
199{
200    tr_globalLock( h );
201    tr_sharedTraversalEnable( h->shared, enable );
202    tr_globalUnlock( h );
203}
204
205tr_handle_status * tr_handleStatus( tr_handle * h )
206{
207    tr_handle_status * s;
208
209    h->statCur = ( h->statCur + 1 ) % 2;
210    s = &h->stats[h->statCur];
211
212    tr_globalLock( h );
213
214    s->natTraversalStatus = tr_sharedTraversalStatus( h->shared );
215    s->publicPort = tr_sharedGetPublicPort( h->shared );
216
217    tr_globalUnlock( h );
218
219    return s;
220}
221
222/***
223****
224***/
225
226void
227tr_setUseGlobalSpeedLimit( tr_handle  * h,
228                           int          up_or_down,
229                           int          use_flag )
230{
231    char * ch = up_or_down==TR_UP ? &h->useUploadLimit
232                                  : &h->useDownloadLimit;
233    *ch = use_flag;
234}
235
236void
237tr_setGlobalSpeedLimit( tr_handle  * h,
238                        int          up_or_down,
239                        int          KiB_sec )
240{
241    if( up_or_down == TR_DOWN )
242        tr_rcSetLimit( h->download, KiB_sec );
243    else
244        tr_rcSetLimit( h->upload, KiB_sec );
245}
246
247void
248tr_getGlobalSpeedLimit( tr_handle  * h,
249                        int          up_or_down,
250                        int        * setme_enabled,
251                        int          * setme_KiBsec )
252{
253    if( setme_enabled != NULL )
254       *setme_enabled = up_or_down==TR_UP ? h->useUploadLimit
255                                          : h->useDownloadLimit;
256    if( setme_KiBsec != NULL )
257       *setme_KiBsec = tr_rcGetLimit( up_or_down==TR_UP ? h->upload
258                                                        : h->download );
259}
260
261void
262tr_torrentRates( tr_handle * h, float * dl, float * ul )
263{
264    tr_torrent * tor;
265
266    *dl = 0.0;
267    *ul = 0.0;
268    tr_globalLock( h );
269    for( tor = h->torrentList; tor; tor = tor->next )
270    {
271        tr_torrentLock( tor );
272        if( tor->cpStatus == TR_CP_INCOMPLETE )
273            *dl += tr_rcRate( tor->download );
274        *ul += tr_rcRate( tor->upload );
275        tr_torrentUnlock( tor );
276    }
277    tr_globalUnlock( h );
278}
279
280int
281tr_torrentCount( tr_handle * h )
282{
283    return h->torrentCount;
284}
285
286void
287tr_torrentIterate( tr_handle * h, tr_callback_t func, void * d )
288{
289    tr_torrent * tor, * next;
290
291    for( tor = h->torrentList; tor; tor = next )
292    {
293        next = tor->next;
294        func( tor, d );
295    }
296}
297
298static void
299tr_closeImpl( void * vh )
300{
301    tr_handle * h = vh;
302    tr_peerMgrFree( h->peerMgr );
303
304    tr_rcClose( h->upload );
305    tr_rcClose( h->download );
306
307    tr_sharedClose( h->shared );
308    tr_fdClose();
309
310    h->isClosed = TRUE;
311}
312void
313tr_close( tr_handle * h )
314{
315    assert( tr_torrentCount( h ) == 0 );
316
317    tr_runInEventThread( h, tr_closeImpl, h );
318    while( !h->isClosed )
319        tr_wait( 200 );
320
321    tr_eventClose( h );
322    while( h->events != NULL ) {
323        fprintf( stderr, "waiting for libevent thread to close...\n" );
324        tr_wait( 200 );
325    }
326
327    tr_lockFree( h->lock );
328    free( h->tag );
329    free( h );
330    fprintf( stderr, "tr_close() completed.\n" );
331}
332
333tr_torrent **
334tr_loadTorrents ( tr_handle   * h,
335                  const char  * destination,
336                  int           flags,
337                  int         * setmeCount )
338{
339    int i, n = 0;
340    struct stat sb;
341    DIR * odir = NULL;
342    const char * torrentDir = tr_getTorrentsDirectory( );
343    tr_torrent ** torrents;
344    tr_list *l=NULL, *list=NULL;
345
346    if( !stat( torrentDir, &sb )
347        && S_ISDIR( sb.st_mode )
348        && (( odir = opendir ( torrentDir ) )) )
349    {
350        struct dirent *d;
351        for (d = readdir( odir ); d!=NULL; d=readdir( odir ) )
352        {
353            if( d->d_name && d->d_name[0]!='.' ) /* skip dotfiles, ., and .. */
354            {
355                tr_torrent * tor;
356                char path[MAX_PATH_LENGTH];
357                tr_buildPath( path, sizeof(path), torrentDir, d->d_name, NULL );
358                tor = tr_torrentInit( h, path, destination, flags, NULL );
359                if( tor != NULL ) {
360                    tr_list_append( &list, tor );
361                    //fprintf (stderr, "#%d - %s\n", n, tor->info.name );
362                    n++;
363                }
364            }
365        }
366        closedir( odir );
367    }
368
369    torrents = tr_new( tr_torrent*, n );
370    for( i=0, l=list; l!=NULL; l=l->next )
371        torrents[i++] = (tr_torrent*) l->data;
372    assert( i==n );
373
374    tr_list_free( &list, NULL );
375
376    *setmeCount = n;
377    tr_inf( "Loaded %d torrents from disk", *setmeCount );
378    return torrents;
379}
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