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388 lines
12 KiB
388 lines
12 KiB
/* This software was written by Dirk Engling <erdgeist@erdgeist.org> |
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It is considered beerware. Prost. Skol. Cheers or whatever. |
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$id$ */ |
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/* System */ |
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#include <stdlib.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include <sys/uio.h> |
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#include <arpa/inet.h> |
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#include <sys/types.h> |
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#include <sys/mman.h> |
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#include <unistd.h> |
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#include <time.h> |
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#include <math.h> |
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#include <errno.h> |
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/* Libowfat */ |
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#include "scan.h" |
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#include "byte.h" |
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#include "io.h" |
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/* Opentracker */ |
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#include "trackerlogic.h" |
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#include "ot_mutex.h" |
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#include "ot_stats.h" |
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#include "ot_clean.h" |
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#include "ot_accesslist.h" |
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#include "ot_fullscrape.h" |
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#include "ot_sync.h" |
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#include "ot_livesync.h" |
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void free_peerlist( ot_peerlist *peer_list ) { |
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size_t i; |
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for( i=0; i<OT_POOLS_COUNT; ++i ) |
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if( peer_list->peers[i].data ) |
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free( peer_list->peers[i].data ); |
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#ifdef WANT_SYNC_BATCH |
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free( peer_list->changeset.data ); |
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#endif |
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free( peer_list ); |
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} |
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ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer WANT_SYNC_PARAM( int from_changeset ) ) { |
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int exactmatch; |
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ot_torrent *torrent; |
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ot_peer *peer_dest; |
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ot_vector *torrents_list = mutex_bucket_lock_by_hash( hash ), *peer_pool; |
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int base_pool = 0; |
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if( !accesslist_hashisvalid( hash ) ) { |
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mutex_bucket_unlock_by_hash( hash ); |
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return NULL; |
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} |
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torrent = vector_find_or_insert( torrents_list, (void*)hash, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch ); |
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if( !torrent ) { |
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mutex_bucket_unlock_by_hash( hash ); |
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return NULL; |
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} |
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if( !exactmatch ) { |
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/* Create a new torrent entry, then */ |
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memmove( &torrent->hash, hash, sizeof( ot_hash ) ); |
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if( !( torrent->peer_list = malloc( sizeof (ot_peerlist) ) ) ) { |
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vector_remove_torrent( torrents_list, torrent ); |
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mutex_bucket_unlock_by_hash( hash ); |
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return NULL; |
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} |
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byte_zero( torrent->peer_list, sizeof( ot_peerlist ) ); |
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} else |
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clean_single_torrent( torrent ); |
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/* Timestamp our first pool */ |
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torrent->peer_list->base = NOW; |
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/* Sanitize flags: Whoever claims to have completed download, must be a seeder */ |
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if( ( OT_FLAG( peer ) & ( PEER_FLAG_COMPLETED | PEER_FLAG_SEEDING ) ) == PEER_FLAG_COMPLETED ) |
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OT_FLAG( peer ) ^= PEER_FLAG_COMPLETED; |
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#ifdef WANT_SYNC |
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if( from_changeset ) { |
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/* Check, whether peer already is in current pool, do nothing if so */ |
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peer_pool = &torrent->peer_list->peers[0]; |
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binary_search( peer, peer_pool->data, peer_pool->size, sizeof(ot_peer), OT_PEER_COMPARE_SIZE, &exactmatch ); |
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if( exactmatch ) { |
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mutex_bucket_unlock_by_hash( hash ); |
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return torrent; |
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} |
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base_pool = 1; |
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} |
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#endif |
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peer_pool = &torrent->peer_list->peers[ base_pool ]; |
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peer_dest = vector_find_or_insert( peer_pool, (void*)peer, sizeof( ot_peer ), OT_PEER_COMPARE_SIZE, &exactmatch ); |
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/* If we hadn't had a match in current pool, create peer there and |
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remove it from all older pools */ |
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if( !exactmatch ) { |
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int i; |
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memmove( peer_dest, peer, sizeof( ot_peer ) ); |
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torrent->peer_list->peer_count++; |
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#ifdef WANT_SYNC_LIVE |
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if( !from_changeset ) |
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livesync_tell( hash, peer, PEER_FLAG_LEECHING ); |
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#endif |
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if( OT_FLAG( peer ) & PEER_FLAG_COMPLETED ) |
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torrent->peer_list->down_count++; |
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if( OT_FLAG(peer) & PEER_FLAG_SEEDING ) { |
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torrent->peer_list->seed_counts[ base_pool ]++; |
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torrent->peer_list->seed_count++; |
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} |
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for( i= base_pool + 1; i<OT_POOLS_COUNT; ++i ) { |
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switch( vector_remove_peer( &torrent->peer_list->peers[i], peer, 0 ) ) { |
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case 0: continue; |
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case 2: torrent->peer_list->seed_counts[i]--; |
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torrent->peer_list->seed_count--; |
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case 1: default: |
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torrent->peer_list->peer_count--; |
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mutex_bucket_unlock_by_hash( hash ); |
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return torrent; |
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} |
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} |
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} else { |
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if( (OT_FLAG(peer_dest) & PEER_FLAG_SEEDING ) && !(OT_FLAG(peer) & PEER_FLAG_SEEDING ) ) { |
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torrent->peer_list->seed_counts[ base_pool ]--; |
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torrent->peer_list->seed_count--; |
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} |
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if( !(OT_FLAG(peer_dest) & PEER_FLAG_SEEDING ) && (OT_FLAG(peer) & PEER_FLAG_SEEDING ) ) { |
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torrent->peer_list->seed_counts[ base_pool ]++; |
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torrent->peer_list->seed_count++; |
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} |
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if( !(OT_FLAG( peer_dest ) & PEER_FLAG_COMPLETED ) && (OT_FLAG( peer ) & PEER_FLAG_COMPLETED ) ) |
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torrent->peer_list->down_count++; |
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if( OT_FLAG( peer_dest ) & PEER_FLAG_COMPLETED ) |
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OT_FLAG( peer ) |= PEER_FLAG_COMPLETED; |
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memmove( peer_dest, peer, sizeof( ot_peer ) ); |
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} |
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mutex_bucket_unlock_by_hash( hash ); |
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return torrent; |
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} |
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/* Compiles a list of random peers for a torrent |
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* reply must have enough space to hold 92+6*amount bytes |
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* Selector function can be anything, maybe test for seeds, etc. |
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* RANDOM may return huge values |
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* does not yet check not to return self |
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*/ |
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size_t return_peers_for_torrent( ot_hash *hash, size_t amount, char *reply, PROTO_FLAG proto ) { |
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char *r = reply; |
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int exactmatch; |
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ot_vector *torrents_list = mutex_bucket_lock_by_hash( hash ); |
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ot_torrent *torrent = binary_search( hash, torrents_list->data, torrents_list->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch ); |
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ot_peerlist *peer_list = torrent->peer_list; |
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size_t index; |
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if( !torrent ) { |
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mutex_bucket_unlock_by_hash( hash ); |
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return 0; |
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} |
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if( peer_list->peer_count < amount ) |
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amount = peer_list->peer_count; |
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if( proto == FLAG_TCP ) |
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r += sprintf( r, "d8:completei%zde10:downloadedi%zde10:incompletei%zde8:intervali%ie5:peers%zd:", peer_list->seed_count, peer_list->down_count, peer_list->peer_count-peer_list->seed_count, OT_CLIENT_REQUEST_INTERVAL_RANDOM, 6*amount ); |
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else { |
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*(uint32_t*)(r+0) = htonl( OT_CLIENT_REQUEST_INTERVAL_RANDOM ); |
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*(uint32_t*)(r+4) = htonl( peer_list->peer_count ); |
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*(uint32_t*)(r+8) = htonl( peer_list->seed_count ); |
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r += 12; |
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} |
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if( amount ) { |
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unsigned int pool_offset, pool_index = 0;; |
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unsigned int shifted_pc = peer_list->peer_count; |
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unsigned int shifted_step = 0; |
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unsigned int shift = 0; |
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/* Make fixpoint arithmetic as exact as possible */ |
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#define MAXPRECBIT (1<<(8*sizeof(int)-3)) |
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while( !(shifted_pc & MAXPRECBIT ) ) { shifted_pc <<= 1; shift++; } |
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shifted_step = shifted_pc/amount; |
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#undef MAXPRECBIT |
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/* Initialize somewhere in the middle of peers so that |
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fixpoint's aliasing doesn't alway miss the same peers */ |
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pool_offset = random() % peer_list->peer_count; |
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for( index = 0; index < amount; ++index ) { |
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/* This is the aliased, non shifted range, next value may fall into */ |
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unsigned int diff = ( ( ( index + 1 ) * shifted_step ) >> shift ) - |
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( ( index * shifted_step ) >> shift ); |
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pool_offset += 1 + random() % diff; |
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while( pool_offset >= peer_list->peers[pool_index].size ) { |
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pool_offset -= peer_list->peers[pool_index].size; |
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pool_index = ( pool_index + 1 ) % OT_POOLS_COUNT; |
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} |
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memmove( r, ((ot_peer*)peer_list->peers[pool_index].data) + pool_offset, 6 ); |
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r += 6; |
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} |
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} |
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if( proto == FLAG_TCP ) |
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*r++ = 'e'; |
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mutex_bucket_unlock_by_hash( hash ); |
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return r - reply; |
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} |
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/* Fetches scrape info for a specific torrent */ |
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size_t return_udp_scrape_for_torrent( ot_hash *hash, char *reply ) { |
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int exactmatch; |
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ot_vector *torrents_list = mutex_bucket_lock_by_hash( hash ); |
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ot_torrent *torrent = binary_search( hash, torrents_list->data, torrents_list->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch ); |
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if( !exactmatch ) { |
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memset( reply, 0, 12); |
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} else { |
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uint32_t *r = (uint32_t*) reply; |
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if( clean_single_torrent( torrent ) ) { |
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vector_remove_torrent( torrents_list, torrent ); |
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memset( reply, 0, 12); |
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} else { |
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r[0] = htonl( torrent->peer_list->seed_count ); |
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r[1] = htonl( torrent->peer_list->down_count ); |
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r[2] = htonl( torrent->peer_list->peer_count-torrent->peer_list->seed_count ); |
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} |
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} |
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mutex_bucket_unlock_by_hash( hash ); |
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return 12; |
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} |
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/* Fetches scrape info for a specific torrent */ |
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size_t return_tcp_scrape_for_torrent( ot_hash *hash_list, int amount, char *reply ) { |
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char *r = reply; |
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int exactmatch, i; |
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r += sprintf( r, "d5:filesd" ); |
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for( i=0; i<amount; ++i ) { |
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ot_hash *hash = hash_list + i; |
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ot_vector *torrents_list = mutex_bucket_lock_by_hash( hash ); |
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ot_torrent *torrent = binary_search( hash, torrents_list->data, torrents_list->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch ); |
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if( exactmatch ) { |
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if( clean_single_torrent( torrent ) ) { |
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vector_remove_torrent( torrents_list, torrent ); |
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} else { |
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memmove( r, "20:", 3 ); memmove( r+3, hash, 20 ); |
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r += sprintf( r+23, "d8:completei%zde10:downloadedi%zde10:incompletei%zdee", |
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torrent->peer_list->seed_count, torrent->peer_list->down_count, torrent->peer_list->peer_count-torrent->peer_list->seed_count ) + 23; |
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} |
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} |
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mutex_bucket_unlock_by_hash( hash ); |
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} |
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*r++ = 'e'; *r++ = 'e'; |
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return r - reply; |
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} |
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size_t remove_peer_from_torrent( ot_hash *hash, ot_peer *peer, char *reply, PROTO_FLAG proto ) { |
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int exactmatch; |
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size_t index; |
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ot_vector *torrents_list = mutex_bucket_lock_by_hash( hash ); |
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ot_torrent *torrent = binary_search( hash, torrents_list->data, torrents_list->size, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch ); |
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ot_peerlist *peer_list; |
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#ifdef WANT_SYNC_LIVE |
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if( proto != FLAG_MCA ) |
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livesync_tell( hash, peer, PEER_FLAG_STOPPED ); |
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#endif |
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if( !exactmatch ) { |
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mutex_bucket_unlock_by_hash( hash ); |
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if( proto == FLAG_TCP ) |
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return sprintf( reply, "d8:completei0e10:incompletei0e8:intervali%ie5:peers0:e", OT_CLIENT_REQUEST_INTERVAL_RANDOM ); |
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/* Create fake packet to satisfy parser on the other end */ |
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if( proto == FLAG_UDP ) { |
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((uint32_t*)reply)[2] = htonl( OT_CLIENT_REQUEST_INTERVAL_RANDOM ); |
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((uint32_t*)reply)[3] = ((uint32_t*)reply)[4] = 0; |
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return (size_t)20; |
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} |
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if( proto == FLAG_MCA ) |
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return 0; |
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} |
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peer_list = torrent->peer_list; |
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for( index = 0; index<OT_POOLS_COUNT; ++index ) { |
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switch( vector_remove_peer( &peer_list->peers[index], peer, index == 0 ) ) { |
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case 0: continue; |
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case 2: peer_list->seed_counts[index]--; |
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peer_list->seed_count--; |
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case 1: default: |
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peer_list->peer_count--; |
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goto exit_loop; |
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} |
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} |
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exit_loop: |
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if( proto == FLAG_TCP ) { |
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size_t reply_size = sprintf( reply, "d8:completei%zde10:incompletei%zde8:intervali%ie5:peers0:e", peer_list->seed_count, peer_list->peer_count - peer_list->seed_count, OT_CLIENT_REQUEST_INTERVAL_RANDOM ); |
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mutex_bucket_unlock_by_hash( hash ); |
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return reply_size; |
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} |
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/* Handle UDP reply */ |
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if( proto == FLAG_UDP ) { |
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((uint32_t*)reply)[2] = htonl( OT_CLIENT_REQUEST_INTERVAL_RANDOM ); |
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((uint32_t*)reply)[3] = htonl( peer_list->peer_count - peer_list->seed_count ); |
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((uint32_t*)reply)[4] = htonl( peer_list->seed_count); |
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} |
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mutex_bucket_unlock_by_hash( hash ); |
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return (size_t)20; |
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} |
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void exerr( char * message ) { |
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fprintf( stderr, "%s\n", message ); |
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exit( 111 ); |
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} |
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int trackerlogic_init( const char * const serverdir ) { |
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if( serverdir && chdir( serverdir ) ) { |
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fprintf( stderr, "Could not chdir() to %s, because %s\n", serverdir, strerror(errno) ); |
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return -1; |
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} |
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srandom( time(NULL) ); |
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g_tracker_id = random(); |
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/* Initialise background worker threads */ |
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mutex_init( ); |
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clean_init( ); |
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fullscrape_init( ); |
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accesslist_init( ); |
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livesync_init( ); |
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sync_init( ); |
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stats_init( ); |
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return 0; |
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} |
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void trackerlogic_deinit( void ) { |
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int bucket; |
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size_t j; |
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/* Deinitialise background worker threads */ |
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stats_deinit( ); |
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sync_deinit( ); |
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livesync_init( ); |
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accesslist_init( ); |
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fullscrape_deinit( ); |
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clean_deinit( ); |
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/* Free all torrents... */ |
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for(bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) { |
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ot_vector *torrents_list = mutex_bucket_lock( bucket ); |
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if( torrents_list->size ) { |
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for( j=0; j<torrents_list->size; ++j ) { |
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ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + j; |
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free_peerlist( torrent->peer_list ); |
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} |
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free( torrents_list->data ); |
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} |
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mutex_bucket_unlock( bucket ); |
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} |
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/* Release mutexes */ |
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mutex_deinit( ); |
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} |
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const char *g_version_trackerlogic_c = "$Source$: $Revision$\n";
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