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108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/* 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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