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107 lines
3.1 KiB
107 lines
3.1 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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/* System */ |
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#include <sys/types.h> |
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#include <sys/mman.h> |
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#include <stdio.h> |
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#include <string.h> |
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/* Libowfat */ |
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#include "scan.h" |
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#include "byte.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_sync.h" |
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#ifdef WANT_TRACKER_SYNC |
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/* Import Changeset from an external authority |
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format: d4:syncd[..]ee |
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[..]: ( 20:01234567890abcdefghij16:XXXXYYYY )+ |
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*/ |
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int add_changeset_to_tracker( ot_byte *data, size_t len ) { |
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ot_hash *hash; |
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ot_byte *end = data + len; |
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unsigned long peer_count; |
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/* We do know, that the string is \n terminated, so it cant |
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overflow */ |
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if( byte_diff( data, 8, "d4:syncd" ) ) return -1; |
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data += 8; |
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while( 1 ) { |
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if( byte_diff( data, 3, "20:" ) ) { |
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if( byte_diff( data, 2, "ee" ) ) |
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return -1; |
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return 0; |
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} |
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data += 3; |
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hash = (ot_hash*)data; |
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data += sizeof( ot_hash ); |
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/* Scan string length indicator */ |
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data += ( len = scan_ulong( (char*)data, &peer_count ) ); |
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/* If no long was scanned, it is not divisible by 8, it is not |
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followed by a colon or claims to need to much memory, we fail */ |
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if( !len || !peer_count || ( peer_count & 7 ) || ( *data++ != ':' ) || ( data + peer_count > end ) ) |
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return -1; |
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while( peer_count > 0 ) { |
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add_peer_to_torrent( hash, (ot_peer*)data, 1 ); |
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data += 8; peer_count -= 8; |
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} |
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} |
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return 0; |
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} |
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/* Proposed output format |
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d4:syncd20:<info_hash>8*N:(xxxxyyyy)*Nee |
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*/ |
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size_t return_changeset_for_tracker( char **reply ) { |
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size_t allocated = 0, i, replysize; |
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ot_vector *torrents_list; |
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int bucket; |
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char *r; |
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/* Maybe there is time to clean_all_torrents(); */ |
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/* Determine space needed for whole changeset */ |
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for( bucket = 0; bucket < OT_BUCKET_COUNT; ++bucket ) { |
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torrents_list = mutex_bucket_lock(bucket); |
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for( i=0; i<torrents_list->size; ++i ) { |
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ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + i; |
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allocated += sizeof( ot_hash ) + sizeof(ot_peer) * torrent->peer_list->changeset.size + 13; |
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} |
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mutex_bucket_unlock(bucket); |
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} |
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/* add "d4:syncd" and "ee" */ |
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allocated += 8 + 2; |
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if( !( r = *reply = mmap( NULL, allocated, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0 ) ) ) |
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return 0; |
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memmove( r, "d4:syncd", 8 ); r += 8; |
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for( bucket = 0; bucket < OT_BUCKET_COUNT; ++bucket ) { |
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torrents_list = mutex_bucket_lock(bucket); |
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for( i=0; i<torrents_list->size; ++i ) { |
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ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + i; |
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const size_t byte_count = sizeof(ot_peer) * torrent->peer_list->changeset.size; |
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*r++ = '2'; *r++ = '0'; *r++ = ':'; |
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memmove( r, torrent->hash, sizeof( ot_hash ) ); r += sizeof( ot_hash ); |
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r += sprintf( r, "%zd:", byte_count ); |
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memmove( r, torrent->peer_list->changeset.data, byte_count ); r += byte_count; |
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} |
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mutex_bucket_unlock(bucket); |
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} |
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*r++ = 'e'; *r++ = 'e'; |
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replysize = ( r - *reply ); |
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fix_mmapallocation( *reply, allocated, replysize ); |
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return replysize; |
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} |
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#endif
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