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This is a complete rewrite... assume nothing works.

master
Dirk Engling 15 years ago
parent
commit
2039029366
  1. 4
      opentracker.c
  2. 356
      trackerlogic.c
  3. 55
      trackerlogic.h

4
opentracker.c

@ -141,8 +141,8 @@ e400:
case 8:
if( byte_diff(data,8,"announce"))
goto e404;
byte_copy( peer.ip, 4, h->ip );
peer.port = 6881;
byte_copy( &peer.ip, 4, h->ip );
peer.port_flags = 6881 << 16;
numwant = 50;
compact = 1;
scanon = 1;

356
trackerlogic.c

@ -8,12 +8,19 @@
#include <sys/mman.h>
#include <unistd.h>
#include <time.h>
#include <math.h>
#include <glob.h>
#include <errno.h>
#include "scan.h"
#include "byte.h"
// Helper functions for binary_find
//
int compare_hash( const void *hash1, const void *hash2 ) { return memcmp( hash1, hash2, sizeof( ot_hash )); }
int compare_ip_port( const void *peer1, const void *peer2 ) { return memcmp( &((ot_peer)peer1)->ip, &((ot_peer)peer2)->ip, 6); }
int compare_ip_port( const void *peer1, const void *peer2 ) {
if( ((ot_peer)peer1)->ip != ((ot_peer)peer2)->ip ) return ((ot_peer)peer1)->ip - ((ot_peer)peer2)->ip;
return ((ot_peer)peer1)->port_flags - ((ot_peer)peer2)->port_flags; }
void *binary_search( const void *key, const void *base,
unsigned long member_count, const unsigned long member_size,
@ -40,235 +47,169 @@ void *binary_search( const void *key, const void *base,
// Converter function from memory to human readable hex strings
// * definitely not thread safe!!!
//
char ths[1+2*20];char *to_hex(ot_byte*s){char*m="0123456789ABCDEF";char*e=ths+40;char*t=ths;while(t<e){*t++=m[*s>>4];*t++=m[*s++&15];}*t=0;return ths;}
char ths[1+2*20];char*to_hex(ot_byte*s){char*m="0123456789ABCDEF";char*e=ths+40;char*t=ths;while(t<e){*t++=m[*s>>4];*t++=m[*s++&15];}*t=0;return ths;}
// GLOBAL VARIABLES
//
unsigned long torrents_count = 0;
ot_torrent torrents_list = 0;
ot_byte *scratch_space = 0;
struct ot_vector all_torrents[256];
void *vector_find_or_insert( ot_vector vector, void *key, size_t member_size, int(*compare_func)(const void*, const void*), int *exactmatch ) {
ot_byte *end = ((ot_byte*)vector->data) + member_size * vector->size;
ot_byte *match = BINARY_FIND( key, vector->data, vector->size, member_size, compare_func, exactmatch );
if( exactmatch ) return match;
if( vector->size + 1 >= vector->space ) {
void *new_data = realloc( vector->data, vector->space ? 2 * vector->space : 1024 );
if( !new_data ) return NULL;
vector->data = new_data;
vector->space = vector->space ? vector->space * 2 : 1024;
}
MEMMOVE( match + member_size, match, end - match );
vector->size++;
return match;
}
int vector_remove_peer( ot_vector vector, ot_peer peer ) {
int exactmatch;
ot_peer end = ((ot_peer)vector->data) + vector->size;
ot_peer match;
if( !vector->size ) return 0;
match = BINARY_FIND( peer, vector->data, vector->size, sizeof( struct ot_peer ), compare_ip_port, &exactmatch );
if( !exactmatch ) return 0;
exactmatch = match->port_flags & PEER_FLAG_SEEDING ? 2 : 1;
MEMMOVE( match, match + 1, end - match - 1 );
vector->size--;
return exactmatch;
}
void free_peerlist( ot_peerlist peer_list ) {
int i;
for( i=0; i<OT_POOLS_COUNT; ++i )
if( peer_list->peers[i].data )
free( peer_list->peers[i].data );
free( peer_list );
}
int vector_remove_torrent( ot_vector vector, ot_hash *hash ) {
int exactmatch;
ot_torrent end = ((ot_torrent)vector->data) + vector->size;
ot_torrent match = BINARY_FIND( hash, vector->data, vector->size, sizeof( struct ot_torrent ), compare_hash, &exactmatch );
if( !exactmatch ) return -1;
free_peerlist( match->peer_list );
MEMMOVE( match, match + 1, end - match - 1 );
vector->size--;
if( ( 3*vector->size < vector->space ) && ( vector->space > 1024 ) ) {
realloc( vector->data, vector->space >> 1 );
vector->space >>= 1;
}
return 0;
}
#define SETINVALID( i ) (scratch_space[index] = 3);
#define SETSELECTED( i ) (scratch_space[index] = 1);
#define TESTSELECTED( i ) (scratch_space[index] == 1 )
#define TESTSET( i ) (scratch_space[index])
#define RANDOM random()
void clean_peerlist( ot_peerlist peer_list ) {
exit( 1 );
}
ot_torrent add_peer_to_torrent( ot_hash *hash, ot_peer peer ) {
int exactmatch;
ot_torrent torrent;
ot_peer peer_dest;
int exactmatch;
ot_vector torrents_list = all_torrents + *hash[0], peer_pool;
torrent = BINARY_FIND( hash, torrents_list, torrents_count, sizeof( *torrent ), compare_hash, &exactmatch );
if( !exactmatch ) {
// Assume, OS will provide us with space, after all, this is file backed
MEMMOVE( torrent + 1, torrent, ( torrents_list + torrents_count ) - torrent );
torrent = vector_find_or_insert( torrents_list, (void*)hash, sizeof( struct ot_torrent ), compare_hash, &exactmatch );
if( !torrent ) return NULL;
if( !exactmatch ) {
// Create a new torrent entry, then
torrent->peer_list = malloc( sizeof (struct ot_peerlist) );
if( !torrent->peer_list ) {
vector_remove_torrent( torrents_list, hash );
return NULL;
}
MEMMOVE( &torrent->hash, hash, sizeof( ot_hash ) );
torrent->peer_list = map_file( to_hex( *hash ) );
torrent->peer_count = 0;
torrent->seed_count = 0;
}
peer_dest = BINARY_FIND( peer, torrent->peer_list, torrent->peer_count, sizeof( *peer_dest ), compare_ip_port, &exactmatch );
if( exactmatch ) {
// If peer was a seeder but isn't anymore, decrease seeder count
if( ( peer_dest->flags & PEER_FLAG_SEEDING ) && !( peer->flags & PEER_FLAG_SEEDING ) )
torrent->seed_count--;
if( !( peer_dest->flags & PEER_FLAG_SEEDING ) && ( peer->flags & PEER_FLAG_SEEDING ) )
torrent->seed_count++;
} else {
// Assume, OS will provide us with space, after all, this is file backed
MEMMOVE( peer_dest + 1, peer_dest, ( torrent->peer_list + torrent->peer_count ) - peer_dest );
byte_zero( torrent->peer_list, sizeof( struct ot_peerlist ));
torrent->peer_list->base = NOW;
} else
clean_peerlist( torrent->peer_list );
// Create a new peer entry, then
MEMMOVE( peer_dest, peer, sizeof( ot_peer ) );
peer_pool = &torrent->peer_list->peers[0];
peer_dest = vector_find_or_insert( peer_pool, (void*)peer, sizeof( struct ot_peer ), compare_ip_port, &exactmatch );
torrent->peer_count++;
torrent->seed_count+= ( peer->flags & PEER_FLAG_SEEDING ) ? 1 : 0;
// If we hadn't had a match in current pool, create peer there and
// remove it from all older pools
if( !exactmatch ) {
int i;
MEMMOVE( peer_dest, peer, sizeof( struct ot_peer ) );
if( peer->port_flags & PEER_FLAG_SEEDING )
torrent->peer_list->seed_count[0]++;
for( i=1; i<OT_POOLS_COUNT; ++i ) {
switch( vector_remove_peer( &torrent->peer_list->peers[i], peer ) ) {
case 0: continue;
case 2: torrent->peer_list->seed_count[i]--;
case 1: default: return torrent;
}
}
} else {
if( (peer_dest->port_flags & PEER_FLAG_SEEDING ) && !(peer->port_flags & PEER_FLAG_SEEDING ) )
torrent->peer_list->seed_count[0]--;
if( !(peer_dest->port_flags & PEER_FLAG_SEEDING ) && (peer->port_flags & PEER_FLAG_SEEDING ) )
torrent->peer_list->seed_count[0]++;
}
// Set new time out time
peer_dest->death = NOW + OT_TIMEOUT;
return torrent;
}
inline int TESTVALIDPEER( ot_peer p ) { return p->death > NOW; }
// Compiles a list of random peers for a torrent
// * scratch space keeps track of death or already selected peers
// * reply must have enough space to hold 1+(1+16+2+1)*amount+1 bytes
// * reply must have enough space to hold 24+6*amount bytes
// * Selector function can be anything, maybe test for seeds, etc.
// * that RANDOM may return huge values
// * RANDOM may return huge values
// * does not yet check not to return self
// * it is not guaranteed to see all peers, so no assumptions on active seeders/peers may be done
// * since compact format cannot handle v6 addresses, it must be enabled by OT_COMPACT_ONLY
//
size_t return_peers_for_torrent( ot_torrent torrent, unsigned long amount, char *reply ) {
register ot_peer peer_base = torrent->peer_list;
char *r = reply;
unsigned long peer_count = torrent->peer_count;
unsigned long selected_count = 0, invalid_count = 0;
unsigned long index = 0;
// optimize later ;)
BZERO( scratch_space, peer_count );
while( ( selected_count < amount ) && ( selected_count + invalid_count < peer_count ) ) {
// skip to first non-flagged peer
while( TESTSET(index) ) index = ( index + 1 ) % peer_count;
if( TESTVALIDPEER( peer_base + index ) ) {
SETINVALID(index); invalid_count++;
} else {
SETSELECTED(index); selected_count++;
index = ( index + RANDOM ) % peer_count;
char *r = reply;
unsigned long peer_count, index;
unsigned long pool_offset = 0, pool_index = 0;
signed long wert = -1;
for( peer_count=index=0; index<OT_POOLS_COUNT; ++index) peer_count += torrent->peer_list->peers[index].size;
if( peer_count < amount ) amount = peer_count;
r += FORMAT_FORMAT_STRING( r, "d5:peers%li:",6*amount );
for( index = 0; index < amount; ++index ) {
double step = 1.8*((double)( peer_count - wert - 1 ))/((double)( amount - index ));
int off = random() % (int)floor( step );
off = 1 + ( off % ( peer_count - wert - 1 ));
wert += off;
while( pool_offset + off > torrent->peer_list->peers[pool_index].size ) {
off -= torrent->peer_list->peers[pool_index].size - pool_offset;
pool_offset = 0; pool_index++;
}
}
// Now our scratchspace contains a list of selected_count valid peers
// Collect them into a reply string
index = 0;
#ifndef OT_COMPACT_ONLY
r += FORMAT_FIXED_STRING( r, "d5:peersl" );
#else
r += FORMAT_FORMAT_STRING( r, "d5:peers%li:",6*selected_count );
#endif
while( selected_count-- ) {
ot_peer peer;
while( !TESTSELECTED( index ) ) ++index;
peer = peer_base + index;
#ifdef OT_COMPACT_ONLY
MEMMOVE( r, &peer->ip, 4 );
MEMMOVE( r+4, &peer->port, 2 );
MEMMOVE( r, ((ot_peer*)torrent->peer_list->peers[pool_index].data)[pool_offset], 6 );
r += 6;
#else
r += FORMAT_FORMAT_STRING( r, "d2:ip%d:%s7:peer id20:%20c4:porti%ie",
peer->flags & PEER_IP_LENGTH_MASK,
peer->ip,
peer->id,
peer->port );
#endif
}
#ifndef OT_COMPACT_ONLY
r += FORMAT_FIXED_STRING( r, "ee" );
#else
r += FORMAT_FIXED_STRING( r, "e" );
#endif
*r++ = 'e';
return r - reply;
}
// Compacts a torrents peer list
// * torrents older than OT_TIMEOUT are being kicked
// * is rather expensive
// * if this fails, torrent file is invalid, should add flag
//
void heal_torrent( ot_torrent torrent ) {
unsigned long index = 0, base = 0, end, seed_count = 0, now = NOW;
// Initialize base to first dead peer.
while( ( base < torrent->peer_count ) && torrent->peer_list[base].death <= now ) {
seed_count += ( torrent->peer_list[base].flags & PEER_FLAG_SEEDING ) ? 1 : 0;
base++;
}
// No dead peers? Home.
if( base == torrent->peer_count ) return;
// From now index always looks to the next living peer while base keeps track of
// the dead peer that marks the beginning of insert space.
index = base + 1;
while( 1 ) {
// Let index search for next living peer
while( ( index < torrent->peer_count ) && torrent->peer_list[index].death > now ) index++;
// No further living peers found - base is our new peer count
if( index == torrent->peer_count ) {
torrent->peer_count = base;
torrent->seed_count = seed_count;
return;
}
end = index + 1;
// Let end search for next dead peer (end of living peers)
while( ( end < torrent->peer_count ) && torrent->peer_list[end].death <= now ) {
seed_count += ( torrent->peer_list[end].flags & PEER_FLAG_SEEDING ) ? 1 : 0;
end++;
}
// We either hit a dead peer or the end of our peers
// In both cases: move block towards base
MEMMOVE( torrent->peer_list + base, torrent->peer_list + index, ( end - index ) * sizeof( struct ot_peer ) );
base += end - index;
index = end;
}
}
void dispose_torrent( ot_torrent torrent ) {
unmap_file( NULL, torrent->peer_list, 0 );
unlink( to_hex( torrent->hash ) );
MEMMOVE( torrent, torrent + 1, ( torrents_list + torrents_count ) - ( torrent + 1 ) );
torrents_count--;
}
// This function maps a "huge" file into process space
// * giving no name will aqcuire anonymous growable memory
// * memory will not be "freed" from systems vm if once used, until unmap_file
// * I guess, we should be checking for more errors...
//
void *map_file( char *file_name ) {
char *map;
if( file_name ) {
int file_desc=open(file_name,O_RDWR|O_CREAT|O_NDELAY,0644);
printf( "%s\n", file_name );
if( file_desc < 0) return 0;
lseek( file_desc, OT_HUGE_FILESIZE, SEEK_SET );
write( file_desc, "_", 1 );
map=mmap(0,OT_HUGE_FILESIZE,PROT_READ|PROT_WRITE,MAP_SHARED,file_desc,0);
close(file_desc);
} else
map=mmap(0,OT_HUGE_FILESIZE,PROT_READ|PROT_WRITE,MAP_ANON|MAP_PRIVATE,-1,0);
return (map == (char*)-1) ? 0 : map;
}
void unmap_file( char *file_name, void *map, unsigned long real_size ) {
munmap( map, OT_HUGE_FILESIZE );
if( file_name)
truncate( file_name, real_size );
}
void count_peers_and_seeds( ot_peer peer_list, unsigned long *peers, unsigned long *seeds ) {
*peers = *seeds = 0;
if( peer_list[*peers].ip )
do {
*seeds += peer_list[*peers++].flags & PEER_FLAG_SEEDING ? 1 : 0;
} while( compare_ip_port( peer_list + *peers, peer_list + *peers - 1 ) < 0 );
}
int init_logic( char *directory ) {
glob_t globber;
int i;
if( directory )
chdir( directory );
if( directory ) {
if( chdir( directory ))
return -1;
}
scratch_space = map_file( NULL );
torrents_list = map_file( NULL );
torrents_count = 0;
srandom( time(NULL));
if( !scratch_space || !torrents_list ) {
if( scratch_space || torrents_list )
unmap_file( NULL, scratch_space ? (void*)scratch_space : (void*)torrents_list, 0 );
return -1;
}
// Initialize control structures
byte_zero( all_torrents, sizeof (all_torrents));
// Scan directory for filenames in the form [0-9A-F]{20}
// * I know this looks ugly, but I've seen A-F to match umlauts as well in strange locales
@ -286,19 +227,8 @@ int init_logic( char *directory ) {
"[0-9ABCDEFabcdef][0-9ABCDEFabcdef][0-9ABCDEFabcdef][0-9ABCDEFabcdef]"
, GLOB_NOCHECK, 0, &globber) )
{
for( i=0; i<globber.gl_matchc; ++i ) {
#ifdef _DEBUG
printf( "Found dir: %s\n", globber.gl_pathv[i] );
#endif
if( ( torrents_list[torrents_count].peer_list = map_file( globber.gl_pathv[i] ) ) ) {
MEMMOVE( &torrents_list[torrents_count].hash, globber.gl_pathv[i], sizeof( ot_hash ) );
count_peers_and_seeds( torrents_list[torrents_count].peer_list,
&torrents_list[torrents_count].peer_count,
&torrents_list[torrents_count].seed_count );
torrents_count++;
}
}
for( i=0; i<globber.gl_matchc; ++i )
printf( "Found: %s\n", globber.gl_pathv[i] );
}
globfree( &globber );
@ -306,9 +236,15 @@ int init_logic( char *directory ) {
}
void deinit_logic( ) {
// For all torrents... blablabla
while( torrents_count-- )
unmap_file( to_hex(torrents_list[torrents_count].hash), torrents_list[torrents_count].peer_list, torrents_list[torrents_count].peer_count * sizeof(struct ot_peer) );
unmap_file( NULL, torrents_list, 0 );
unmap_file( NULL, scratch_space, 0 );
int i, j;
// Free all torrents...
for(i=0; i<256; ++i ) {
if( all_torrents[i].size ) {
ot_torrent torrents_list = (ot_torrent)all_torrents[i].data;
for( j=0; j<all_torrents[i].size; ++j )
free_peerlist( torrents_list[j].peer_list );
free( all_torrents[i].data );
}
}
byte_zero( all_torrents, sizeof (all_torrents));
}

55
trackerlogic.h

@ -2,6 +2,7 @@
#define __TRACKERLOGIC_H__
#include <sys/types.h>
#include <sys/time.h>
/* Should be called BYTE, WORD, DWORD - but some OSs already have that and there's no #iftypedef */
/* They mark memory used as data instead of integer or human readable string -
@ -10,15 +11,9 @@ typedef unsigned char ot_byte;
typedef unsigned short ot_word;
typedef unsigned long ot_dword;
typedef unsigned long ot_time;
typedef ot_byte ot_hash[20];
typedef ot_byte ot_ip[ 4/*0*/ ];
// tunables
static const unsigned long OT_TIMEOUT = 2700;
static const unsigned long OT_HUGE_FILESIZE = 1024*1024*256; // Thats 256MB per file, enough for 204800 peers of 128 bytes
// We will not service v6, yes
#define OT_COMPACT_ONLY
typedef ot_dword ot_ip;
typedef time_t ot_time;
#define MEMMOVE memmove
#define BZERO bzero
@ -27,28 +22,41 @@ static const unsigned long OT_HUGE_FILESIZE = 1024*1024*256; // Thats 256MB p
#define BINARY_FIND binary_search
#define NOW time(NULL)
// We maintain a list of 256 pointers to sorted list of ot_torrent structs
// Sort key is, of course, its hash
// This list points to 9 pools of peers each grouped in five-minute-intervals
// thus achieving a timeout of 2700s or 45 minutes
// These pools are sorted by its binary content
#define OT_POOLS_COUNT 9
#define OT_POOLS_TIMEOUT 300
typedef struct ot_vector {
void *data;
size_t size;
size_t space;
} *ot_vector;
typedef struct ot_peer {
#ifndef OT_COMPACT_ONLY
ot_hash id;
ot_hash key;
#endif
ot_ip ip;
ot_word port;
ot_time death;
ot_byte flags;
ot_ip ip;
ot_dword port_flags;
} *ot_peer;
static const ot_byte PEER_FLAG_SEEDING = 0x80;
static const ot_byte PEER_IP_LENGTH_MASK = 0x3f;
typedef struct {
typedef struct ot_peerlist {
ot_time base;
unsigned long seed_count[ OT_POOLS_COUNT ];
struct ot_vector peers[ OT_POOLS_COUNT ];
} *ot_peerlist;
typedef struct ot_torrent {
ot_hash hash;
ot_peer peer_list;
unsigned long peer_count;
unsigned long seed_count;
ot_peerlist peer_list;
} *ot_torrent;
void *map_file( char *file_name );
void unmap_file( char *file_name, void *map, unsigned long real_size );
void *map_file( char *file_name, size_t map_size );
void unmap_file( char *file_name, void *map, size_t mapped_size, unsigned long real_size );
// This behaves quite like bsearch but allows to find
// the insertion point for inserts after unsuccessful searches
@ -68,6 +76,5 @@ void deinit_logic( );
ot_torrent add_peer_to_torrent( ot_hash *hash, ot_peer peer );
size_t return_peers_for_torrent( ot_torrent torrent, unsigned long amount, char *reply );
void heal_torrent( ot_torrent torrent );
#endif
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