summaryrefslogtreecommitdiff
path: root/trackerlogic.c
blob: d112abd8595762f5a5052912c2b503c9e375e242 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
   It is considered beerware. Prost. Skol. Cheers or whatever. */

#include "trackerlogic.h"

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <time.h>
#include <math.h>
#include <glob.h>

#include <errno.h>
#include "scan.h"
#include "byte.h"

#if defined( WANT_CLOSED_TRACKER ) || defined( WANT_BLACKLIST )
#include <sys/stat.h>
#endif

/* GLOBAL VARIABLES */
static ot_vector all_torrents[256];
#ifdef WANT_CLOSED_TRACKER
int g_closedtracker = 1;
static ot_torrent* const OT_TORRENT_NOT_ON_WHITELIST = (ot_torrent*)1;
#endif

#ifdef WANT_BLACKLIST
int g_check_blacklist = 1;
static ot_torrent* const OT_TORRENT_ON_BLACKLIST = (ot_torrent*)2;
#endif

/* Converter function from memory to human readable hex strings
   - definitely not thread safe!!!
*/
static char ths[2+2*20]="-";static char*to_hex(ot_byte*s){const char*m="0123456789ABCDEF";char*e=ths+41;char*t=ths+1;while(t<e){*t++=m[*s>>4];*t++=m[*s++&15];}*t=0;return ths+1;}

/* This function gives us a binary search that returns a pointer, even if
   no exact match is found. In that case it sets exactmatch 0 and gives
   calling functions the chance to insert data
*/
static void *binary_search( const void * const key, const void * base, const size_t member_count, const size_t member_size,
                            size_t compare_size, int *exactmatch ) {
  size_t mc = member_count;
  ot_byte *lookat = ((ot_byte*)base) + member_size * (member_count >> 1);
  *exactmatch = 1;

  while( mc ) {
    int cmp = memcmp( lookat, key, compare_size);
    if (cmp == 0) return (void *)lookat;
    if (cmp < 0) {
      base = (void*)(lookat + member_size);
      --mc;
    }
    mc >>= 1;
    lookat = ((ot_byte*)base) + member_size * (mc >> 1);
  }
  *exactmatch = 0;
  return (void*)lookat;
}

/* This is the generic insert operation for our vector type.
   It tries to locate the object at "key" with size "member_size" by comparing its first "compare_size" bytes with
   those of objects in vector. Our special "binary_search" function does that and either returns the match or a
   pointer to where the object is to be inserted. vector_find_or_insert makes space for the object and copies it,
   if it wasn't found in vector. Caller needs to check the passed "exactmatch" variable to see, whether an insert
   took place. If resizing the vector failed, NULL is returned, else the pointer to the object in vector.
*/
static void *vector_find_or_insert( ot_vector *vector, void *key, size_t member_size, size_t compare_size, int *exactmatch ) {
  ot_byte *match = binary_search( key, vector->data, vector->size, member_size, compare_size, exactmatch );

  if( *exactmatch ) return match;

  if( vector->size + 1 >= vector->space ) {
    size_t   new_space = vector->space ? OT_VECTOR_GROW_RATIO * vector->space : OT_VECTOR_MIN_MEMBERS;
    ot_byte *new_data = realloc( vector->data, new_space * member_size );
    if( !new_data ) return NULL;

    /* Adjust pointer if it moved by realloc */
    match = new_data + (match - (ot_byte*)vector->data);

    vector->data = new_data;
    vector->space = new_space;
  }
  memmove( match + member_size, match, ((ot_byte*)vector->data) + member_size * vector->size - match );
  vector->size++;
  return match;
}

/* This is the non-generic delete from vector-operation specialized for peers in pools.
   Set hysteresis == 0 if you expect the vector not to ever grow again.
   It returns 0 if no peer was found (and thus not removed)
              1 if a non-seeding peer was removed
              2 if a seeding peer was removed
*/
static int vector_remove_peer( ot_vector *vector, ot_peer *peer, int hysteresis ) {
  int      exactmatch;
  size_t   shrink_thresh = hysteresis ? OT_VECTOR_SHRINK_THRESH : OT_VECTOR_SHRINK_RATIO;
  ot_peer *end = ((ot_peer*)vector->data) + vector->size;
  ot_peer *match;

  if( !vector->size ) return 0;
  match = binary_search( peer, vector->data, vector->size, sizeof( ot_peer ), OT_PEER_COMPARE_SIZE, &exactmatch );

  if( !exactmatch ) return 0;
  exactmatch = ( OT_FLAG( match ) & PEER_FLAG_SEEDING ) ? 2 : 1;
  memmove( match, match + 1, sizeof(ot_peer) * ( end - match - 1 ) );
  if( ( --vector->size * shrink_thresh < vector->space ) && ( vector->space > OT_VECTOR_MIN_MEMBERS ) ) {
    vector->space /= OT_VECTOR_SHRINK_RATIO;
    vector->data = realloc( vector->data, vector->space * sizeof( ot_peer ) );
  }
  if( !vector->size ) {
    /* for peer pools its safe to let them go,
       in 999 of 1000 this happens in older pools, that won't ever grow again */
    free( vector->data );
    vector->data = NULL;
    vector->space = 0;
  }
  return exactmatch;
}

static void free_peerlist( ot_peerlist *peer_list ) {
  size_t i;
  for( i=0; i<OT_POOLS_COUNT; ++i )
    if( peer_list->peers[i].data )
      free( peer_list->peers[i].data );
  free( peer_list );
}

/* This is the non-generic delete from vector-operation specialized for torrents in buckets.
   it returns 0 if the hash wasn't found in vector
              1 if the torrent was removed from vector
*/
static int vector_remove_torrent( ot_vector *vector, ot_hash *hash ) {
  int exactmatch;
  ot_torrent *end = ((ot_torrent*)vector->data) + vector->size;
  ot_torrent *match;

  if( !vector->size ) return 0;

  match = binary_search( hash, vector->data, vector->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch );
  if( !exactmatch ) return 0;

  /* If this is being called after a unsuccessful malloc() for peer_list
     in add_peer_to_torrent, match->peer_list actually might be NULL */
  if( match->peer_list) free_peerlist( match->peer_list );

  memmove( match, match + 1, sizeof(ot_torrent) * ( end - match - 1 ) );
  if( ( --vector->size * OT_VECTOR_SHRINK_THRESH < vector->space ) && ( vector->space > OT_VECTOR_MIN_MEMBERS ) ) {
    vector->space /= OT_VECTOR_SHRINK_RATIO;
    vector->data = realloc( vector->data, vector->space * sizeof( ot_torrent ) );
  }
  return 1;
}

/* This function deallocates all timedouted pools and shifts all other pools
   it Returns 1 if torrent itself has not seen an announce for more than OT_TORRENT_TIMEOUT time units
              0 if torrent is not yet timed out
   Note: We expect NOW as a parameter since calling time() may be expensive
*/
static int clean_peerlist( time_t time_now, ot_peerlist *peer_list ) {
  int i, timedout = (int)( time_now - peer_list->base );

  if( !timedout ) return 0;
  if( timedout > OT_POOLS_COUNT ) timedout = OT_POOLS_COUNT;

  for( i = OT_POOLS_COUNT - timedout; i < OT_POOLS_COUNT; ++i )
    free( peer_list->peers[i].data);

  memmove( peer_list->peers + timedout, peer_list->peers, sizeof( ot_vector ) * (OT_POOLS_COUNT-timedout) );
  byte_zero( peer_list->peers, sizeof( ot_vector ) * timedout );

  memmove( peer_list->seed_count + timedout, peer_list->seed_count, sizeof( size_t ) * ( OT_POOLS_COUNT - timedout) );
  byte_zero( peer_list->seed_count, sizeof( size_t ) * timedout );

  if( timedout == OT_POOLS_COUNT )
    return time_now - peer_list->base > OT_TORRENT_TIMEOUT;

  peer_list->base = time_now;
  return 0;
}

ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer ) {
  int          exactmatch;
  ot_torrent *torrent;
  ot_peer    *peer_dest;
  ot_vector  *torrents_list = &all_torrents[*hash[0]], *peer_pool;
#if defined( WANT_CLOSED_TRACKER ) || defined( WANT_BLACKLIST )
  struct stat dummy_sb;
  char       *fn = to_hex( (ot_byte*)hash );
#endif

#ifdef WANT_CLOSED_TRACKER
  if( g_closedtracker && stat( fn, &dummy_sb ) )
    return OT_TORRENT_NOT_ON_WHITELIST;
#endif

#ifdef WANT_BLACKLIST
  if( g_check_blacklist && !stat( fn - 1, &dummy_sb ) )
    return OT_TORRENT_ON_BLACKLIST;
#endif

  torrent = vector_find_or_insert( torrents_list, (void*)hash, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch );
  if( !torrent ) return NULL;

  if( !exactmatch ) {
    /* Create a new torrent entry, then */
    memmove( &torrent->hash, hash, sizeof( ot_hash ) );

    if( !( torrent->peer_list = malloc( sizeof (ot_peerlist) ) ) ) {
      vector_remove_torrent( torrents_list, hash );
      return NULL;
    }

    byte_zero( torrent->peer_list, sizeof( ot_peerlist ) );
    torrent->peer_list->base = NOW;
  } else
    clean_peerlist( NOW, torrent->peer_list );

  peer_pool = &torrent->peer_list->peers[0];
  peer_dest = vector_find_or_insert( peer_pool, (void*)peer, sizeof( ot_peer ), OT_PEER_COMPARE_SIZE, &exactmatch );

  if( OT_FLAG( peer ) & PEER_FLAG_COMPLETED )
    torrent->peer_list->downloaded++;

  /* If we hadn't had a match in current pool, create peer there and
     remove it from all older pools */
  if( !exactmatch ) {
    int i;
    memmove( peer_dest, peer, sizeof( ot_peer ) );
    if( OT_FLAG(peer) & PEER_FLAG_SEEDING )
      torrent->peer_list->seed_count[0]++;

    for( i=1; i<OT_POOLS_COUNT; ++i ) {
      switch( vector_remove_peer( &torrent->peer_list->peers[i], peer, 0 ) ) {
        case 0: continue;
        case 2: torrent->peer_list->seed_count[i]--;
        case 1: default: return torrent;
      }
    }
  } else {
    if( (OT_FLAG(peer_dest) & PEER_FLAG_SEEDING ) && !(OT_FLAG(peer) & PEER_FLAG_SEEDING ) )
      torrent->peer_list->seed_count[0]--;
    if( !(OT_FLAG(peer_dest) & PEER_FLAG_SEEDING ) && (OT_FLAG(peer) & PEER_FLAG_SEEDING ) )
      torrent->peer_list->seed_count[0]++;
    memmove( peer_dest, peer, sizeof( ot_peer ) );
  }

  return torrent;
}

/* Compiles a list of random peers for a torrent
   * reply must have enough space to hold 92+6*amount bytes
   * Selector function can be anything, maybe test for seeds, etc.
   * RANDOM may return huge values
   * does not yet check not to return self
*/
size_t return_peers_for_torrent( ot_torrent *torrent, size_t amount, char *reply ) {
  char  *r = reply;
  size_t peer_count, seed_count, index;

#ifdef WANT_CLOSED_TRACKER
  if( torrent == OT_TORRENT_NOT_ON_WHITELIST ) {
    const char * const notvalid = "d14:failure reason43:This torrent is not served by this tracker.e";
    memmove( reply, notvalid, sizeof(notvalid));
    return sizeof(notvalid);
  }
#endif

#ifdef WANT_BLACKLIST
  if( torrent == OT_TORRENT_ON_BLACKLIST ) {
    const char * const blacklisted = "d14:failure reason29:This torrent is black listed.e";
    memmove( reply, blacklisted, sizeof(blacklisted));
    return sizeof(blacklisted);
  }
#endif

  for( peer_count = seed_count = index = 0; index < OT_POOLS_COUNT; ++index ) {
    peer_count += torrent->peer_list->peers[index].size;
    seed_count += torrent->peer_list->seed_count[index];
  }
  if( peer_count < amount ) amount = peer_count;

  r += sprintf( r, "d8:completei%zde10:incompletei%zde8:intervali%ie5:peers%zd:", seed_count, peer_count-seed_count, OT_CLIENT_REQUEST_INTERVAL_RANDOM, 6*amount );
  if( amount ) {
    unsigned int pool_offset, pool_index = 0;;
    unsigned int shifted_pc = peer_count;
    unsigned int shifted_step = 0;
    unsigned int shift = 0;

    /* Make fixpoint arithmetic as exact as possible */
#define MAXPRECBIT (1<<(8*sizeof(int)-3))
    while( !(shifted_pc & MAXPRECBIT ) ) { shifted_pc <<= 1; shift++; }
    shifted_step = shifted_pc/amount;
#undef MAXPRECBIT

    /* Initialize somewhere in the middle of peers so that
       fixpoint's aliasing doesn't alway miss the same peers */
    pool_offset = random() % peer_count;

    for( index = 0; index < amount; ++index ) {
      /* This is the aliased, non shifted range, next value may fall into */
      unsigned int diff = ( ( ( index + 1 ) * shifted_step ) >> shift ) -
                          ( (   index       * shifted_step ) >> shift );
      pool_offset += 1 + random() % diff;

      while( pool_offset >= torrent->peer_list->peers[pool_index].size ) {
        pool_offset -= torrent->peer_list->peers[pool_index].size;
        pool_index = ( pool_index + 1 ) % OT_POOLS_COUNT;
      }

      memmove( r, ((ot_peer*)torrent->peer_list->peers[pool_index].data) + pool_offset, 6 );
      r += 6;
    }
  }
  *r++ = 'e';

  return r - reply;
}

/* Fetch full scrape info for all torrents */
size_t return_fullscrape_for_tracker( char **reply ) {
  size_t torrent_count = 0, j;
  int    i, k;
  char  *r;
  time_t time_now = NOW;

  for( i=0; i<256; ++i ) {
    ot_vector *torrents_list = &all_torrents[i];
    torrent_count += torrents_list->size;
  }

  if( !( r = *reply = malloc( 128*torrent_count ) ) ) return 0;

  memmove( r, "d5:filesd", 9 ); r += 9;
  for( i=0; i<256; ++i ) {
    ot_vector *torrents_list = &all_torrents[i];
    for( j=0; j<torrents_list->size; ++j ) {
      ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[j] ).peer_list;
      ot_hash     *hash      =&( ((ot_torrent*)(torrents_list->data))[j] ).hash;
      size_t       peers = 0, seeds = 0;
      clean_peerlist( time_now, peer_list );
      for( k=0; k<OT_POOLS_COUNT; ++k ) {
        peers += peer_list->peers[k].size;
        seeds += peer_list->seed_count[k];
      }
      memmove( r, "20:", 3 ); r+=3;
      memmove( r, hash, 20 ); r+=20;
      r += sprintf( r, "d8:completei%zde10:downloadedi%zde10:incompletei%zdee", seeds, peer_list->downloaded, peers-seeds );
    }
  }

  *r++='e'; *r++='e';
  return r - *reply;
}

size_t return_memstat_for_tracker( char **reply ) {
  size_t torrent_count = 0, j;
  int    i, k;
  char  *r;
  time_t time_now = NOW;

  for( i=0; i<256; ++i ) {
    ot_vector *torrents_list = &all_torrents[i];
    torrent_count += torrents_list->size;
  }

  if( !( r = *reply = malloc( 256*32 + (43+OT_POOLS_COUNT*32)*torrent_count ) ) ) return 0;

  for( i=0; i<256; ++i )
    r += sprintf( r, "%02X: %08X %08X\n", i, (unsigned int)all_torrents[i].size, (unsigned int)all_torrents[i].space );

  for( i=0; i<256; ++i ) {
    ot_vector *torrents_list = &all_torrents[i];
    for( j=0; j<torrents_list->size; ++j ) {
      ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[j] ).peer_list;
      ot_hash     *hash      =&( ((ot_torrent*)(torrents_list->data))[j] ).hash;
      r += sprintf( r, "\n%s:\n", to_hex( (ot_byte*)hash ) );
      clean_peerlist( time_now, peer_list );
      for( k=0; k<OT_POOLS_COUNT; ++k )
        r += sprintf( r, "\t%04X %04X\n", ((unsigned int)peer_list->peers[k].size), (unsigned int)peer_list->peers[k].space );
    }
  }

  return r - *reply;
}

/* Fetches scrape info for a specific torrent */
size_t return_scrape_for_torrent( ot_hash *hash, char *reply ) {
  char        *r = reply;
  int          exactmatch, i;
  size_t       peers = 0, seeds = 0;
  ot_vector   *torrents_list = &all_torrents[*hash[0]];
  ot_torrent  *torrent = binary_search( hash, torrents_list->data, torrents_list->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch );

  if( !exactmatch ) return sprintf( r, "d5:filesdee" );
  clean_peerlist( NOW, torrent->peer_list );

  for( i=0; i<OT_POOLS_COUNT; ++i ) {
    peers += torrent->peer_list->peers[i].size;
    seeds += torrent->peer_list->seed_count[i];
  }

  memmove( r, "d5:filesd20:", 12 ); memmove( r+12, hash, 20 );
  r += sprintf( r+32, "d8:completei%zde10:downloadedi%zde10:incompletei%zdeeee", seeds, torrent->peer_list->downloaded, peers-seeds ) + 32;

  return r - reply;
}

size_t return_sync_for_torrent( ot_hash *hash, char **reply ) {
  int         exactmatch;
  size_t      peers = 0;
  char       *r;
  ot_vector  *torrents_list = &all_torrents[*hash[0]];
  ot_torrent *torrent = binary_search( hash, torrents_list->data, torrents_list->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch );

  if( exactmatch ) {
    clean_peerlist( NOW, torrent->peer_list );
    peers = torrent->peer_list->peers[0].size;
  }

  if( !( r = *reply = malloc( 10 + peers * sizeof( ot_peer ) ) ) ) return 0;

  memmove( r, "d4:sync", 7 );
  r += 7;
  r += sprintf( r, "%zd:", peers * sizeof( ot_peer ) );
  if( peers ) {
    memmove( r, torrent->peer_list->peers[0].data, peers * sizeof( ot_peer ) );
    r += peers * sizeof( ot_peer );
  }
  *r++ = 'e';
  return r - *reply;
}

typedef struct { int val; ot_torrent * torrent; } ot_record;

/* Fetches stats from tracker */
size_t return_stats_for_tracker( char *reply, int mode ) {
  time_t    time_now = NOW;
  size_t    torrent_count = 0, peer_count = 0, seed_count = 0, j;
  ot_record top5s[5], top5c[5];
  char     *r  = reply;
  int       i,k;

  byte_zero( top5s, sizeof( top5s ) );
  byte_zero( top5c, sizeof( top5c ) );

  for( i=0; i<256; ++i ) {
    ot_vector *torrents_list = &all_torrents[i];
    torrent_count += torrents_list->size;
    for( j=0; j<torrents_list->size; ++j ) {
      ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[j] ).peer_list;
      size_t local_peers = 0, local_seeds = 0;

      if( clean_peerlist( time_now, peer_list ) ) {
        ot_hash *hash =&( ((ot_torrent*)(torrents_list->data))[j] ).hash;
        vector_remove_torrent( torrents_list->data, hash );
        --j;
        continue;
      }
      for( k=0; k<OT_POOLS_COUNT; ++k ) {
        local_peers += peer_list->peers[k].size;
        local_seeds += peer_list->seed_count[k];
      }
      if( mode == STATS_TOP5 ) {
        int idx = 4; while( (idx >= 0) && ( local_peers > top5c[idx].val ) ) --idx;
        if ( idx++ != 4 ) {
          memmove( top5c + idx + 1, top5c + idx, ( 4 - idx ) * sizeof( ot_record ) );
          top5c[idx].val = local_peers;
          top5c[idx].torrent = (ot_torrent*)(torrents_list->data) + j;
        }
        idx = 4; while( (idx >= 0) && ( local_seeds > top5s[idx].val ) ) --idx;
        if ( idx++ != 4 ) {
          memmove( top5s + idx + 1, top5s + idx, ( 4 - idx ) * sizeof( ot_record ) );
          top5s[idx].val = local_seeds;
          top5s[idx].torrent = (ot_torrent*)(torrents_list->data) + j;
        }
      }
      peer_count += local_peers; seed_count += local_seeds;
    }
  }
  if( mode == STATS_TOP5 ) {
    int idx;
    r += sprintf( r, "Top5 torrents by peers:\n" );
    for( idx=0; idx<5; ++idx )
      if( top5c[idx].torrent )
        r += sprintf( r, "\t%i\t%s\n", top5c[idx].val, to_hex(top5c[idx].torrent->hash) );
    r += sprintf( r, "Top5 torrents by seeds:\n" );
    for( idx=0; idx<5; ++idx )
      if( top5s[idx].torrent )
        r += sprintf( r, "\t%i\t%s\n", top5s[idx].val, to_hex(top5s[idx].torrent->hash) );
  } else {
    r += sprintf( r, "%zd\n%zd\nopentracker serving %zd torrents\nopentracker", peer_count, seed_count, torrent_count );
  }

  return r - reply;
}

void remove_peer_from_torrent( ot_hash *hash, ot_peer *peer ) {
  int          exactmatch, i;
  ot_vector   *torrents_list = &all_torrents[*hash[0]];
  ot_torrent  *torrent = binary_search( hash, torrents_list->data, torrents_list->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch );

  if( !exactmatch ) return;

  /* Maybe this does the job */
  if( clean_peerlist( NOW, torrent->peer_list ) ) {
    vector_remove_torrent( torrents_list, hash );
    return;
  }

  for( i=0; i<OT_POOLS_COUNT; ++i )
    switch( vector_remove_peer( &torrent->peer_list->peers[i], peer, i == 0 ) ) {
      case 0: continue;
      case 2: torrent->peer_list->seed_count[i]--;
      case 1: default: return;
    }
}

int init_logic( const char * const serverdir ) {
  if( serverdir && chdir( serverdir ) ) {
    fprintf( stderr, "Could not chdir() to %s\n", serverdir );
    return -1;
  }

  srandom( time(NULL) );

  /* Initialize control structures */
  byte_zero( all_torrents, sizeof (all_torrents) );

  return 0;
}

void deinit_logic( void ) {
  int i;
  size_t j;

  /* Free all torrents... */
  for(i=0; i<256; ++i ) {
    if( all_torrents[i].size ) {
      ot_torrent *torrents_list = (ot_torrent*)all_torrents[i].data;
      for( j=0; j<all_torrents[i].size; ++j )
        free_peerlist( torrents_list[j].peer_list );
      free( all_torrents[i].data );
    }
  }
  byte_zero( all_torrents, sizeof (all_torrents));
}