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