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Cleaned up type namespace, mapping now works, introduced anonymous mapping, made init/deinit code, time now works.... Glue code and init code still missing

master
Dirk Engling 15 years ago
parent
commit
e738f614b4
  1. 164
      trackerlogic.c

164
trackerlogic.c

@ -1,15 +1,25 @@
// THIS REALLY BELONGS INTO A HEADER FILE
//
//
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/mman.h>
typedef unsigned char ot_hash[20];
typedef unsigned char ot_ip[ 4/*0*/ ];
typedef unsigned long ot_time;
#include <unistd.h>
#include <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 -
they should be cast before used as integer/text */
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
const unsigned long OT_TIMEOUT = 2700;
const unsigned long OT_HUGE_FILESIZE = 1024*1024*256; // Thats 256MB per file, enough for 204800 peers of 128 bytes
@ -21,28 +31,30 @@ const unsigned long OT_HUGE_FILESIZE = 1024*1024*256; // Thats 256MB per file
#define FORMAT_FIXED_STRING sprintf
#define FORMAT_FORMAT_STRING sprintf
#define BINARY_FIND binary_search
#define NOW time(NULL)
typedef struct {
typedef struct ot_peer {
#ifndef OT_COMPACT_ONLY
ot_hash id;
ot_hash key;
ot_hash id;
ot_hash key;
#endif
ot_ip ip;
unsigned short port;
ot_time death;
unsigned char flags;
} ot_peer;
unsigned char PEER_FLAG_SEEDING = 0x80;
unsigned char PEER_IP_LENGTH_MASK = 0x3f;
ot_ip ip;
ot_word port;
ot_time death;
ot_byte flags;
} *ot_peer;
ot_byte PEER_FLAG_SEEDING = 0x80;
ot_byte PEER_IP_LENGTH_MASK = 0x3f;
typedef struct {
ot_hash hash;
ot_peer *peer_list;
unsigned long peer_count;
unsigned long seed_count;
} ot_torrent;
ot_hash hash;
ot_peer peer_list;
unsigned long peer_count;
unsigned long seed_count;
} *ot_torrent;
void *map_file( char *file_name );
void unmap_file( char *file_name, void *map, unsigned long real_size );
// This behaves quite like bsearch but allows to find
// the insertion point for inserts after unsuccessful searches
@ -60,28 +72,33 @@ int compare_ip_port( const void *peer1, const void *peer2 ) { return memcmp( pee
//
// END OF STUFF THAT BELONGS INTO A HEADER FILE
ot_torrent *torrents_pointer = 0;
unsigned long torrents_count = 0;
unsigned char *scratchspace;
ot_torrent torrents_list = 0;
ot_byte *scratch_space = 0;
// 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;}
ot_torrent *add_peer_to_torrent( ot_hash hash, ot_peer *peer ) {
ot_torrent *torrent;
ot_peer *peer_dest;
int exactmatch;
ot_torrent add_peer_to_torrent( ot_hash hash, ot_peer peer ) {
ot_torrent torrent;
ot_peer peer_dest;
int exactmatch;
torrent = BINARY_FIND( hash, torrents_pointer, torrents_count, sizeof( ot_torrent ), compare_hash, &exactmatch );
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_pointer + torrents_count ) - torrent );
MEMMOVE( torrent + 1, torrent, ( torrents_list + torrents_count ) - torrent );
// Create a new torrent entry, then
MEMMOVE( &torrent->hash, hash, sizeof( ot_hash ) );
torrent->peer_list = map_file( 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( ot_peer ), compare_ip_port, &exactmatch );
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 ) )
@ -100,18 +117,18 @@ ot_torrent *add_peer_to_torrent( ot_hash hash, ot_peer *peer ) {
}
// Set new time out time
peer_dest->death = now() + OT_TIMEOUT;
peer_dest->death = NOW + OT_TIMEOUT;
return torrent;
}
#define SETINVALID( i ) (scratchspace[index] = 3);
#define SETSELECTED( i ) (scratchspace[index] = 1);
#define TESTSELECTED( i ) (scratchspace[index] == 1 )
#define TESTSET( i ) (scratchspace[index])
#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()
inline int TESTVALIDPEER( ot_peer *p ) { return p->death > now(); }
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
@ -122,14 +139,14 @@ inline int TESTVALIDPEER( ot_peer *p ) { return p->death > now(); }
// * 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
//
void return_peers_for_torrent( ot_torrent *torrent, unsigned long amount, char *reply ) {
register ot_peer *peer_base = torrent->peer_list;
unsigned long peer_count = torrent->peer_count;
unsigned long selected_count = 0, invalid_count = 0;
unsigned long index = 0;
void return_peers_for_torrent( ot_torrent torrent, unsigned long amount, char *reply ) {
register ot_peer peer_base = torrent->peer_list;
unsigned long peer_count = torrent->peer_count;
unsigned long selected_count = 0, invalid_count = 0;
unsigned long index = 0;
// optimize later ;)
BZERO( scratchspace, peer_count );
BZERO( scratch_space, peer_count );
while( ( selected_count < amount ) && ( selected_count + invalid_count < peer_count ) ) {
// skip to first non-flagged peer
@ -150,11 +167,11 @@ void return_peers_for_torrent( ot_torrent *torrent, unsigned long amount, char *
#ifndef OT_COMPACT_ONLY
reply += FORMAT_FIXED_STRING( reply, "d5:peersl" );
#else
reply += FORMAT_FORMAT_STRING( reply, "d5:peers%i:",6*selected_count );
reply += FORMAT_FORMAT_STRING( reply, "d5:peers%li:",6*selected_count );
#endif
while( selected_count-- ) {
ot_peer *peer;
ot_peer peer;
while( !TESTSELECTED( index ) ) ++index;
peer = peer_base + index;
#ifdef OT_COMPACT_ONLY
@ -181,11 +198,11 @@ void return_peers_for_torrent( ot_torrent *torrent, unsigned long amount, char *
// * is rather expansive
// * 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;
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() ) {
while( ( base < torrent->peer_count ) && torrent->peer_list[base].death <= now ) {
seed_count += ( torrent->peer_list[base].flags & PEER_FLAG_SEEDING ) ? 1 : 0;
base++;
}
@ -199,7 +216,7 @@ void heal_torrent( ot_torrent *torrent ) {
while( 1 ) {
// Let index search for next living peer
while( ( index < torrent->peer_count ) && torrent->peer_list[index].death > now() ) index++;
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 ) {
@ -211,25 +228,32 @@ void heal_torrent( ot_torrent *torrent ) {
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() ) {
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( ot_peer ) );
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( "", torrent->peer_list, 0 );
unlink( to_hex( torrent->hash ) );
MEMMOVE( torrent, torrent + 1, ( torrents_list + torrents_count ) - ( torrent + 1 ) );
torrents_count--;
}
void *binary_search( const void *key, const void *base,
unsigned long member_count, const unsigned long member_size,
int (*compar) (const void *, const void *),
int *exactmatch ) {
unsigned char *lookat = ((unsigned char*)base) + member_size * (member_count >> 1);
ot_byte *lookat = ((ot_byte*)base) + member_size * (member_count >> 1);
*exactmatch = 1;
while( member_count ) {
@ -240,7 +264,7 @@ void *binary_search( const void *key, const void *base,
--member_count;
}
member_count >>= 1;
lookat = ((unsigned char*)base) + member_size * (member_count >> 1);
lookat = ((ot_byte*)base) + member_size * (member_count >> 1);
}
*exactmatch = 0;
return (void*)lookat;
@ -248,26 +272,44 @@ void *binary_search( const void *key, const void *base,
}
// This function maps a "huge" file into process space
// * 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;
int file_desc=open(file_name,O_RDWR|O_CREAT|O_NDELAY,0644);
if( file_desc < 0) return 0;
map=mmap(0,OT_HUGE_FILESIZE,PROT_READ|PROT_WRITE,MAP_SHARED,file_desc,0);
close(file_desc);
if( file_name ) {
int file_desc=open(file_name,O_RDWR|O_CREAT|O_NDELAY,0644);
if( file_desc < 0) return 0;
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,-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 );
}
int init_logic( ) {
unlink( "./opentracker_map_index.idx" );
torrents_pointer = map_file( "./opentracker_map_index.idx" );
scratch_space = map_file( "" );
torrents_list = map_file( "" );
torrents_count = 0;
scratchspace = map_file( "./scratchspace" );
// Scan directory for filenames in the form [0-9A-F]{20}
// ...
return 0;
}
void deinit_logic( ) {
unmap_file( torrents_pointer );
// 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( "", torrents_list, 0 );
unmap_file( "", scratch_space, 0 );
}

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