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https://github.com/transmission/transmission
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randomize the announce addresses within multitracker tiers
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1 changed files with 38 additions and 0 deletions
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@ -28,6 +28,7 @@
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#include <assert.h>
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#include <string.h> /* memcmp */
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#include <stdlib.h> /* qsort */
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#include "transmission.h"
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#include "bencode.h"
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@ -289,6 +290,41 @@ tr_torrentInitFilePieces( tr_torrent * tor )
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tor->info.pieces[pp].priority = calculatePiecePriority( tor, pp, -1 );
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}
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struct RandomTracker
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{
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tr_tracker_info tracker;
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int random_value;
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};
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static int
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compareRandomTracker( const void * va, const void * vb )
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{
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const struct RandomTracker * a = va;
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const struct RandomTracker * b = vb;
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if( a->tracker.tier != b->tracker.tier )
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return a->tracker.tier - b->tracker.tier;
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return a->random_value - b->random_value;
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}
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static void
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randomizeTiers( tr_info * info )
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{
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int i;
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const int n = info->trackerCount;
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struct RandomTracker * r;
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r = tr_new0( struct RandomTracker, n );
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for( i=0; i<n; ++i ) {
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r[i].tracker = info->trackers[i];
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r[i].random_value = tr_rand( INT_MAX );
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}
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qsort( r, n, sizeof( struct RandomTracker ), compareRandomTracker );
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for( i=0; i<n; ++i )
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info->trackers[i] = r[i].tracker;
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tr_free( r );
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}
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static void
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torrentRealInit( tr_handle * h,
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tr_torrent * tor,
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@ -303,6 +339,8 @@ torrentRealInit( tr_handle * h,
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tor->handle = h;
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randomizeTiers( info );
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/**
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* Decide on a block size. constraints:
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* (1) most clients decline requests over 16 KiB
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