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/uio.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <arpa/inet.h>
#ifdef WANT_COMPRESSION_GZIP
#include <zlib.h>
#endif
/* Libowfat */
#include "byte.h"
#include "textcode.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_mutex.h"
#include "ot_iovec.h"
#include "ot_fullscrape.h"
/* Fetch full scrape info for all torrents
Full scrapes usually are huge and one does not want to
14 years ago
allocate more memory. So lets get them in 512k units
*/
#define OT_SCRAPE_CHUNK_SIZE (1024)
/* "d8:completei%zde10:downloadedi%zde10:incompletei%zdee" */
#define OT_SCRAPE_MAXENTRYLEN 256
#ifdef WANT_COMPRESSION_GZIP
#define IF_COMPRESSION( TASK ) if( mode & TASK_FLAG_GZIP ) TASK
#define WANT_COMPRESSION_GZIP_PARAM( param1, param2 ) , param1, param2
#else
#define IF_COMPRESSION( TASK )
#define WANT_COMPRESSION_GZIP_PARAM( param1, param2 )
#endif
/* Forward declaration */
static void fullscrape_make( int *iovec_entries, struct iovec **iovector, ot_tasktype mode );
/* Converter function from memory to human readable hex strings
XXX - Duplicated from ot_stats. Needs fix. */
static char*to_hex(char*d,ot_byte*s){char*m="0123456789ABCDEF";char *t=d;char*e=d+40;while(d<e){*d++=m[*s>>4];*d++=m[*s++&15];}*d=0;return t;}
/* This is the entry point into this worker thread
It grabs tasks from mutex_tasklist and delivers results back
*/
static void * fullscrape_worker( void * args) {
int iovec_entries;
struct iovec *iovector;
args = args;
while( 1 ) {
ot_tasktype tasktype = TASK_FULLSCRAPE;
ot_taskid taskid = mutex_workqueue_poptask( &tasktype );
fullscrape_make( &iovec_entries, &iovector, tasktype );
if( mutex_workqueue_pushresult( taskid, iovec_entries, iovector ) )
iovec_free( &iovec_entries, &iovector );
}
return NULL;
}
static pthread_t thread_id;
void fullscrape_init( ) {
pthread_create( &thread_id, NULL, fullscrape_worker, NULL );
}
void fullscrape_deinit( ) {
pthread_cancel( thread_id );
}
void fullscrape_deliver( int64 socket, ot_tasktype tasktype ) {
mutex_workqueue_pushtask( socket, tasktype );
}
static int fullscrape_increase( int *iovec_entries, struct iovec **iovector,
char **r, char **re WANT_COMPRESSION_GZIP_PARAM( z_stream *strm, ot_tasktype mode ) ) {
/* Allocate a fresh output buffer at the end of our buffers list */
if( !( *r = iovec_fix_increase_or_free( iovec_entries, iovector, *r, OT_SCRAPE_CHUNK_SIZE ) ) ) {
/* Deallocate gzip buffers */
IF_COMPRESSION( deflateEnd(strm); )
/* Release lock on current bucket and return */
return -1;
}
/* Adjust new end of output buffer */
*re = *r + OT_SCRAPE_CHUNK_SIZE - OT_SCRAPE_MAXENTRYLEN;
/* When compressing, we have all the bytes in output buffer */
IF_COMPRESSION( { \
*re -= OT_SCRAPE_MAXENTRYLEN; \
strm->next_out = (ot_byte*)*r; \
strm->avail_out = OT_SCRAPE_CHUNK_SIZE; \
deflate( strm, Z_NO_FLUSH ); \
*r = (char*)strm->next_out; \
} )
return 0;
}
static void fullscrape_make( int *iovec_entries, struct iovec **iovector, ot_tasktype mode ) {
int bucket;
char *r, *re;
#ifdef WANT_COMPRESSION_GZIP
char compress_buffer[OT_SCRAPE_MAXENTRYLEN];
z_stream strm;
#endif
/* Setup return vector... */
*iovec_entries = 0;
*iovector = NULL;
if( !( r = iovec_increase( iovec_entries, iovector, OT_SCRAPE_CHUNK_SIZE ) ) )
return;
/* re points to low watermark */
re = r + OT_SCRAPE_CHUNK_SIZE - OT_SCRAPE_MAXENTRYLEN;
#ifdef WANT_COMPRESSION_GZIP
if( mode & TASK_FLAG_GZIP ) {
re += OT_SCRAPE_MAXENTRYLEN;
byte_zero( &strm, sizeof(strm) );
strm.next_in = (ot_byte*)compress_buffer;
strm.next_out = (ot_byte*)r;
strm.avail_out = OT_SCRAPE_CHUNK_SIZE;
if( deflateInit2(&strm,9,Z_DEFLATED,31,8,Z_DEFAULT_STRATEGY) != Z_OK )
fprintf( stderr, "not ok.\n" );
r = compress_buffer;
}
#endif
if( ( mode & TASK_TASK_MASK ) == TASK_FULLSCRAPE )
r += sprintf( r, "d5:filesd" );
/* For each bucket... */
for( bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) {
/* Get exclusive access to that bucket */
ot_vector *torrents_list = mutex_bucket_lock( bucket );
size_t tor_offset;
/* For each torrent in this bucket.. */
for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
/* Address torrents members */
ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[tor_offset] ).peer_list;
ot_hash *hash =&( ((ot_torrent*)(torrents_list->data))[tor_offset] ).hash;
switch( mode & TASK_TASK_MASK ) {
case TASK_FULLSCRAPE:
default:
/* push hash as bencoded string */
*r++='2'; *r++='0'; *r++=':';
memmove( r, hash, 20 ); r+=20;
/* push rest of the scrape string */
r += sprintf( r, "d8:completei%zde10:downloadedi%zde10:incompletei%zdee", peer_list->seed_count, peer_list->down_count, peer_list->peer_count-peer_list->seed_count );
break;
case TASK_FULLSCRAPE_TPB_ASCII:
to_hex( r, *hash ); r+=40;
r += sprintf( r, ":%zd:%zd\n", peer_list->seed_count, peer_list->peer_count-peer_list->seed_count );
break;
case TASK_FULLSCRAPE_TPB_BINARY:
memmove( r, hash, 20 ); r+=20;
*(ot_dword*)r++ = htonl( (uint32_t)peer_list->seed_count );
*(ot_dword*)r++ = htonl( (uint32_t)( peer_list->peer_count-peer_list->seed_count) );
break;
case TASK_FULLSCRAPE_TPB_URLENCODED:
r += fmt_urlencoded( r, (char *)*hash, 20 );
r += sprintf( r, ":%zd:%zd\n", peer_list->seed_count, peer_list->peer_count-peer_list->seed_count );
break;
}
#ifdef WANT_COMPRESSION_GZIP
if( mode & TASK_FLAG_GZIP ) {
strm.next_in = (ot_byte*)compress_buffer;
strm.avail_in = r - compress_buffer;
deflate( &strm, Z_NO_FLUSH );
r = (char*)strm.next_out;
}
#endif
/* Check if there still is enough buffer left */
while( ( r > re ) && fullscrape_increase( iovec_entries, iovector, &r, &re WANT_COMPRESSION_GZIP_PARAM( &strm, mode ) ) )
return mutex_bucket_unlock( bucket );
IF_COMPRESSION( r = compress_buffer; )
}
/* All torrents done: release lock on currenct bucket */
mutex_bucket_unlock( bucket );
}
if( ( mode & TASK_TASK_MASK ) == TASK_FULLSCRAPE )
r += sprintf( r, "ee" );
#ifdef WANT_COMPRESSION_GZIP
if( mode & TASK_FLAG_GZIP ) {
strm.next_in = (ot_byte*)compress_buffer;
strm.avail_in = r - compress_buffer;
deflate( &strm, Z_FINISH );
r = (char*)strm.next_out;
while( ( r > re ) && fullscrape_increase( iovec_entries, iovector, &r, &re WANT_COMPRESSION_GZIP_PARAM( &strm, mode ) ) )
return mutex_bucket_unlock( bucket );
deflateEnd(&strm);
}
#endif
/* Release unused memory in current output buffer */
iovec_fixlast( iovec_entries, iovector, r );
}