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transmission/libtransmission/announcer.c

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/*
* This file Copyright (C) 2009-2010 Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id:$
*/
#include <assert.h>
#include <limits.h>
#include <event.h>
#include <evhttp.h> /* for HTTP_OK */
#include "transmission.h"
#include "announcer.h"
#include "crypto.h"
#include "net.h"
#include "ptrarray.h"
#include "publish.h"
#include "session.h"
#include "tr-dht.h"
#include "tr-lpd.h"
#include "torrent.h"
#include "utils.h"
#include "web.h"
#define STARTED "started"
#define dbgmsg( tier, ... ) \
if( tr_deepLoggingIsActive( ) ) do { \
char name[128]; \
tr_snprintf( name, sizeof( name ), "[%s--%s]", tr_torrentName( tier->tor ), \
( tier->currentTracker ? tier->currentTracker->host->name : "" ) ); \
tr_deepLog( __FILE__, __LINE__, name, __VA_ARGS__ ); \
} while( 0 )
enum
{
/* unless the tracker says otherwise, rescrape this frequently */
DEFAULT_SCRAPE_INTERVAL_SEC = ( 60 * 30 ),
/* unless the tracker says otherwise, this is the announce interval */
DEFAULT_ANNOUNCE_INTERVAL_SEC = ( 60 * 10 ),
/* unless the tracker says otherwise, this is the announce min_interval */
DEFAULT_ANNOUNCE_MIN_INTERVAL_SEC = ( 60 * 2 ),
/* the length of the 'key' argument passed in tracker requests */
KEYLEN = 8,
/* how many web tasks we allow at one time */
MAX_CONCURRENT_TASKS = 48,
/* if a tracker takes more than this long to respond,
* we treat it as nonresponsive */
MAX_TRACKER_RESPONSE_TIME_SECS = ( 60 * 2 ),
/* the value of the 'numwant' argument passed in tracker requests. */
NUMWANT = 80,
/* how long to put slow (nonresponsive) trackers in the penalty box */
SLOW_HOST_PENALTY_SECS = ( 60 * 10 ),
UPKEEP_INTERVAL_SECS = 1,
/* this is an upper limit for the frequency of LDS announces */
LPD_HOUSEKEEPING_INTERVAL_SECS = 30
};
/***
****
***/
static int
compareTransfer( int a_uploaded, int a_downloaded,
int b_uploaded, int b_downloaded )
{
/* higher upload count goes first */
if( a_uploaded != b_uploaded )
return a_uploaded > b_uploaded ? -1 : 1;
/* then higher download count goes first */
if( a_downloaded != b_downloaded )
return a_downloaded > b_downloaded ? -1 : 1;
return 0;
}
/***
****
***/
/**
* used by tr_announcer to recognize nonresponsive
* trackers and de-prioritize them
*/
typedef struct
{
char * name;
/* how many seconds it took to get the last tracker response */
int lastResponseInterval;
/* the last time we sent an announce or scrape message */
time_t lastRequestTime;
/* the last successful announce/scrape time for this host */
time_t lastSuccessfulRequest;
}
tr_host;
static int
compareHosts( const void * va, const void * vb )
{
const tr_host * a = va;
const tr_host * b = vb;
return strcmp( a->name, b->name );
}
static int
compareHostToName( const void * va, const void * vb )
{
const tr_host * a = va;
return strcmp( a->name, vb );
}
/* format: hostname + ':' + port */
static char *
getHostName( const char * url )
{
int port = 0;
char * host = NULL;
char * ret;
tr_urlParse( url, strlen( url ), NULL, &host, &port, NULL );
ret = tr_strdup_printf( "%s:%d", ( host ? host : "invalid" ), port );
tr_free( host );
return ret;
}
static tr_host*
hostNew( const char * name )
{
tr_host * host = tr_new0( tr_host, 1 );
host->name = tr_strdup( name );
return host;
}
static void
hostFree( void * vhost )
{
tr_host * host = vhost;
tr_free( host->name );
tr_free( host );
}
/***
****
***/
/**
* Since we can't poll a tr_torrent's fields after it's destroyed,
* we pre-build the "stop" announcement message when a torrent
* is removed from Transmission
*/
struct stop_message
{
tr_host * host;
char * url;
int up;
int down;
};
static void
stopFree( struct stop_message * stop )
{
tr_free( stop->url );
tr_free( stop );
}
static int
compareStops( const void * va, const void * vb )
{
const struct stop_message * a = va;
const struct stop_message * b = vb;
return compareTransfer( a->up, a->down, b->up, b->down);
}
/***
****
***/
/**
* "global" (per-tr_session) fields
*/
typedef struct tr_announcer
{
tr_ptrArray hosts; /* tr_host */
tr_ptrArray stops; /* struct stop_message */
tr_session * session;
struct event * upkeepTimer;
int slotsAvailable;
time_t lpdHouseKeepingAt;
}
tr_announcer;
tr_bool
tr_announcerHasBacklog( const struct tr_announcer * announcer )
{
return announcer->slotsAvailable < 1;
}
static tr_host *
getHost( tr_announcer * announcer, const char * url )
{
char * name = getHostName( url );
tr_host * host;
host = tr_ptrArrayFindSorted( &announcer->hosts, name, compareHostToName );
if( host == NULL )
{
host = hostNew( name );
tr_ptrArrayInsertSorted( &announcer->hosts, host, compareHosts );
}
tr_free( name );
return host;
}
static void
onUpkeepTimer( int foo UNUSED, short bar UNUSED, void * vannouncer );
static inline time_t
calcRescheduleWithJitter( const int minPeriod )
{
const double jitterFac = 0.1;
assert( minPeriod > 0 );
return tr_time()
+ minPeriod
+ tr_cryptoWeakRandInt( (int) ( minPeriod * jitterFac ) + 1 );
}
void
tr_announcerInit( tr_session * session )
{
tr_announcer * a;
const time_t relaxUntil =
calcRescheduleWithJitter( LPD_HOUSEKEEPING_INTERVAL_SECS / 3 );
assert( tr_isSession( session ) );
a = tr_new0( tr_announcer, 1 );
a->hosts = TR_PTR_ARRAY_INIT;
a->stops = TR_PTR_ARRAY_INIT;
a->session = session;
a->slotsAvailable = MAX_CONCURRENT_TASKS;
a->lpdHouseKeepingAt = relaxUntil;
a->upkeepTimer = tr_new0( struct event, 1 );
evtimer_set( a->upkeepTimer, onUpkeepTimer, a );
tr_timerAdd( a->upkeepTimer, UPKEEP_INTERVAL_SECS, 0 );
session->announcer = a;
}
static void flushCloseMessages( tr_announcer * announcer );
void
tr_announcerClose( tr_session * session )
{
tr_announcer * announcer = session->announcer;
flushCloseMessages( announcer );
evtimer_del( announcer->upkeepTimer );
tr_free( announcer->upkeepTimer );
announcer->upkeepTimer = NULL;
tr_ptrArrayDestruct( &announcer->stops, NULL );
tr_ptrArrayDestruct( &announcer->hosts, hostFree );
session->announcer = NULL;
tr_free( announcer );
}
/***
****
***/
/* a row in tr_tier's list of trackers */
typedef struct
{
tr_host * host;
char * announce;
char * scrape;
char * tracker_id;
int seederCount;
int leecherCount;
int downloadCount;
int downloaderCount;
uint32_t id;
/* sent as the "key" argument in tracker requests
* to verify us if our IP address changes.
* This is immutable for the life of the tracker object.
* The +1 is for '\0' */
char key_param[KEYLEN + 1];
}
tr_tracker_item;
static void
trackerItemCopyAttributes( tr_tracker_item * t, const tr_tracker_item * o )
{
assert( t != o );
assert( t != NULL );
assert( o != NULL );
t->seederCount = o->seederCount;
t->leecherCount = o->leecherCount;
t->downloadCount = o->downloadCount;
t->downloaderCount = o->downloaderCount;
memcpy( t->key_param, o->key_param, sizeof( t->key_param ) );
}
static void
generateKeyParam( char * msg, size_t msglen )
{
size_t i;
const char * pool = "abcdefghijklmnopqrstuvwxyz0123456789";
const int poolSize = strlen( pool );
for( i=0; i<msglen; ++i )
*msg++ = pool[tr_cryptoRandInt( poolSize )];
*msg = '\0';
}
static tr_tracker_item*
trackerNew( tr_announcer * announcer,
const char * announce,
const char * scrape,
uint32_t id )
{
tr_tracker_item * tracker = tr_new0( tr_tracker_item, 1 );
tracker->host = getHost( announcer, announce );
tracker->announce = tr_strdup( announce );
tracker->scrape = tr_strdup( scrape );
tracker->id = id;
generateKeyParam( tracker->key_param, KEYLEN );
tracker->seederCount = -1;
tracker->leecherCount = -1;
tracker->downloadCount = -1;
return tracker;
}
static void
trackerFree( void * vtracker )
{
tr_tracker_item * tracker = vtracker;
tr_free( tracker->tracker_id );
tr_free( tracker->announce );
tr_free( tracker->scrape );
tr_free( tracker );
}
/***
****
***/
struct tr_torrent_tiers;
/** @brief A group of trackers in a single tier, as per the multitracker spec */
typedef struct
{
/* number of up/down/corrupt bytes since the last time we sent an
* "event=stopped" message that was acknowledged by the tracker */
uint64_t byteCounts[3];
tr_ptrArray trackers; /* tr_tracker_item */
tr_tracker_item * currentTracker;
int currentTrackerIndex;
tr_torrent * tor;
time_t scrapeAt;
time_t lastScrapeStartTime;
time_t lastScrapeTime;
tr_bool lastScrapeSucceeded;
tr_bool lastScrapeTimedOut;
time_t announceAt;
time_t manualAnnounceAllowedAt;
time_t lastAnnounceStartTime;
time_t lastAnnounceTime;
tr_bool lastAnnounceSucceeded;
tr_bool lastAnnounceTimedOut;
tr_ptrArray announceEvents; /* const char* */
/* unique lookup key */
int key;
int scrapeIntervalSec;
int announceIntervalSec;
int announceMinIntervalSec;
int lastAnnouncePeerCount;
tr_bool isRunning;
tr_bool isAnnouncing;
tr_bool isScraping;
tr_bool wasCopied;
char lastAnnounceStr[128];
char lastScrapeStr[128];
}
tr_tier;
static tr_tier *
tierNew( tr_torrent * tor )
{
tr_tier * t;
static int nextKey = 1;
const time_t now = tr_time( );
t = tr_new0( tr_tier, 1 );
t->key = nextKey++;
t->announceEvents = TR_PTR_ARRAY_INIT;
t->trackers = TR_PTR_ARRAY_INIT;
t->currentTracker = NULL;
t->currentTrackerIndex = -1;
t->scrapeIntervalSec = DEFAULT_SCRAPE_INTERVAL_SEC;
t->announceIntervalSec = DEFAULT_ANNOUNCE_INTERVAL_SEC;
t->announceMinIntervalSec = DEFAULT_ANNOUNCE_MIN_INTERVAL_SEC;
t->scrapeAt = now + tr_cryptoWeakRandInt( 60*5 );
t->tor = tor;
return t;
}
static void
tierFree( void * vtier )
{
tr_tier * tier = vtier;
tr_ptrArrayDestruct( &tier->trackers, trackerFree );
tr_ptrArrayDestruct( &tier->announceEvents, NULL );
tr_free( tier );
}
static void
tierCopyAttributes( tr_tier * t, const tr_tier * o )
{
int i, n;
tr_tier bak;
assert( t != NULL );
assert( o != NULL );
assert( t != o );
bak = *t;
*t = *o;
t->tor = bak.tor;
t->trackers = bak.trackers;
t->announceEvents = bak.announceEvents;
t->currentTracker = bak.currentTracker;
t->currentTrackerIndex = bak.currentTrackerIndex;
tr_ptrArrayClear( &t->announceEvents );
for( i=0, n=tr_ptrArraySize(&o->announceEvents); i<n; ++i )
tr_ptrArrayAppend( &t->announceEvents, tr_ptrArrayNth((tr_ptrArray*)&o->announceEvents,i) );
}
static void
tierIncrementTracker( tr_tier * tier )
{
/* move our index to the next tracker in the tier */
const int i = ( tier->currentTrackerIndex + 1 )
% tr_ptrArraySize( &tier->trackers );
tier->currentTracker = tr_ptrArrayNth( &tier->trackers, i );
tier->currentTrackerIndex = i;
/* reset some of the tier's fields */
tier->scrapeIntervalSec = DEFAULT_SCRAPE_INTERVAL_SEC;
tier->announceIntervalSec = DEFAULT_ANNOUNCE_INTERVAL_SEC;
tier->announceMinIntervalSec = DEFAULT_ANNOUNCE_MIN_INTERVAL_SEC;
tier->isAnnouncing = FALSE;
tier->isScraping = FALSE;
tier->lastAnnounceStartTime = 0;
tier->lastScrapeStartTime = 0;
}
static void
tierAddTracker( tr_announcer * announcer,
tr_tier * tier,
const char * announce,
const char * scrape,
uint32_t id )
{
tr_tracker_item * tracker = trackerNew( announcer, announce, scrape, id );
tr_ptrArrayAppend( &tier->trackers, tracker );
dbgmsg( tier, "adding tracker %s", announce );
if( !tier->currentTracker )
tierIncrementTracker( tier );
}
/***
****
***/
/**
* @brief Opaque, per-torrent data structure for tracker announce information
*
* this opaque data structure can be found in tr_torrent.tiers
*/
typedef struct tr_torrent_tiers
{
tr_ptrArray tiers;
tr_publisher publisher;
}
tr_torrent_tiers;
static tr_torrent_tiers*
tiersNew( void )
{
tr_torrent_tiers * tiers = tr_new0( tr_torrent_tiers, 1 );
tiers->tiers = TR_PTR_ARRAY_INIT;
tiers->publisher = TR_PUBLISHER_INIT;
return tiers;
}
static void
tiersFree( tr_torrent_tiers * tiers )
{
tr_publisherDestruct( &tiers->publisher );
tr_ptrArrayDestruct( &tiers->tiers, tierFree );
tr_free( tiers );
}
static tr_tier*
getTier( tr_announcer * announcer, int torrentId, int tierId )
{
tr_tier * tier = NULL;
if( announcer )
{
tr_torrent * tor = tr_torrentFindFromId( announcer->session, torrentId );
if( tor && tor->tiers )
{
int i;
tr_ptrArray * tiers = &tor->tiers->tiers;
const int n = tr_ptrArraySize( tiers );
for( i=0; !tier && i<n; ++i )
{
tr_tier * tmp = tr_ptrArrayNth( tiers, i );
if( tmp->key == tierId )
tier = tmp;
}
}
}
return tier;
}
/***
**** PUBLISH
***/
static const tr_tracker_event emptyEvent = { 0, NULL, NULL, NULL, 0, 0 };
static void
publishMessage( tr_tier * tier, const char * msg, int type )
{
if( tier && tier->tor && tier->tor->tiers )
{
tr_torrent_tiers * tiers = tier->tor->tiers;
tr_tracker_event event = emptyEvent;
event.messageType = type;
event.text = msg;
event.tracker = tier->currentTracker ? tier->currentTracker->announce : NULL;
tr_publisherPublish( &tiers->publisher, tier, &event );
}
}
static void
publishErrorClear( tr_tier * tier )
{
publishMessage( tier, NULL, TR_TRACKER_ERROR_CLEAR );
}
static void
publishErrorMessageAndStop( tr_tier * tier, const char * msg )
{
tier->isRunning = FALSE;
publishMessage( tier, msg, TR_TRACKER_ERROR );
}
static void
publishWarning( tr_tier * tier, const char * msg )
{
publishMessage( tier, msg, TR_TRACKER_WARNING );
}
static int
getSeedProbability( int seeds, int leechers )
{
if( !seeds )
return 0;
if( seeds>=0 && leechers>=0 )
return (int)((100.0*seeds)/(seeds+leechers));
return -1; /* unknown */
}
static int
publishNewPeers( tr_tier * tier, int seeds, int leechers,
const void * compact, int compactLen )
{
tr_tracker_event e = emptyEvent;
e.messageType = TR_TRACKER_PEERS;
e.seedProbability = getSeedProbability( seeds, leechers );
e.compact = compact;
e.compactLen = compactLen;
tr_publisherPublish( &tier->tor->tiers->publisher, tier, &e );
return compactLen / 6;
}
static int
publishNewPeersCompact( tr_tier * tier, int seeds, int leechers,
const void * compact, int compactLen )
{
int i;
const uint8_t *compactWalk;
uint8_t *array, *walk;
const int peerCount = compactLen / 6;
const int arrayLen = peerCount * ( sizeof( tr_address ) + 2 );
tr_address addr;
tr_port port;
addr.type = TR_AF_INET;
memset( &addr.addr, 0, sizeof( addr.addr ) );
array = tr_new( uint8_t, arrayLen );
for ( i=0, walk=array, compactWalk=compact ; i<peerCount ; ++i )
{
memcpy( &addr.addr.addr4, compactWalk, 4 );
memcpy( &port, compactWalk + 4, 2 );
memcpy( walk, &addr, sizeof( addr ) );
memcpy( walk + sizeof( addr ), &port, 2 );
walk += sizeof( tr_address ) + 2;
compactWalk += 6;
}
publishNewPeers( tier, seeds, leechers, array, arrayLen );
tr_free( array );
return peerCount;
}
static int
publishNewPeersCompact6( tr_tier * tier, int seeds, int leechers,
const void * compact, int compactLen )
{
int i;
const uint8_t *compactWalk;
uint8_t *array, *walk;
const int peerCount = compactLen / 18;
const int arrayLen = peerCount * ( sizeof( tr_address ) + 2 );
tr_address addr;
tr_port port;
addr.type = TR_AF_INET6;
memset( &addr.addr, 0, sizeof( addr.addr ) );
array = tr_new( uint8_t, arrayLen );
for ( i = 0, walk = array, compactWalk = compact ; i < peerCount ; ++i )
{
memcpy( &addr.addr.addr6, compactWalk, 16 );
memcpy( &port, compactWalk + 16, 2 );
compactWalk += 18;
memcpy( walk, &addr, sizeof( addr ) );
memcpy( walk + sizeof( addr ), &port, 2 );
walk += sizeof( tr_address ) + 2;
}
publishNewPeers( tier, seeds, leechers, array, arrayLen );
tr_free( array );
return peerCount;
}
static char*
createAnnounceURL( const tr_announcer * announcer,
const tr_torrent * torrent,
const tr_tier * tier,
const char * eventName )
{
const int isStopping = !strcmp( eventName, "stopped" );
const int numwant = isStopping ? 0 : NUMWANT;
const tr_tracker_item * tracker = tier->currentTracker;
const char * ann = tracker->announce;
struct evbuffer * buf = evbuffer_new( );
char * ret;
const char * str;
const unsigned char * ipv6;
evbuffer_expand( buf, 2048 );
evbuffer_add_printf( buf, "%s"
"%c"
"info_hash=%s"
"&peer_id=%s"
"&port=%d"
"&uploaded=%" PRIu64
"&downloaded=%" PRIu64
"&left=%" PRIu64
"&numwant=%d"
"&key=%s"
"&compact=1"
"&supportcrypto=1",
ann,
strchr( ann, '?' ) ? '&' : '?',
torrent->info.hashEscaped,
torrent->peer_id,
(int)tr_sessionGetPeerPort( announcer->session ),
tier->byteCounts[TR_ANN_UP],
tier->byteCounts[TR_ANN_DOWN],
tr_cpLeftUntilComplete( &torrent->completion ),
numwant,
tracker->key_param );
if( announcer->session->encryptionMode == TR_ENCRYPTION_REQUIRED )
evbuffer_add_printf( buf, "&requirecrypto=1" );
if( tier->byteCounts[TR_ANN_CORRUPT] )
evbuffer_add_printf( buf, "&corrupt=%" PRIu64, tier->byteCounts[TR_ANN_CORRUPT] );
str = eventName;
if( str && *str )
evbuffer_add_printf( buf, "&event=%s", str );
str = tracker->tracker_id;
if( str && *str )
evbuffer_add_printf( buf, "&trackerid=%s", str );
/* There are two incompatible techniques for announcing an IPv6 address.
BEP-7 suggests adding an "ipv6=" parameter to the announce URL,
while OpenTracker requires that peers announce twice, once over IPv4
and once over IPv6.
To be safe, we should do both: add the "ipv6=" parameter and
announce twice. At any rate, we're already computing our IPv6
address (for the LTEP handshake), so this comes for free. */
ipv6 = tr_globalIPv6( );
if( ipv6 ) {
char ipv6_readable[INET6_ADDRSTRLEN];
inet_ntop( AF_INET6, ipv6, ipv6_readable, INET6_ADDRSTRLEN );
evbuffer_add_printf( buf, "&ipv6=");
tr_http_escape( buf, ipv6_readable, strlen(ipv6_readable), TRUE );
}
ret = tr_strndup( EVBUFFER_DATA( buf ), EVBUFFER_LENGTH( buf ) );
dbgmsg( tier, "announce URL is \"%s\"", ret );
evbuffer_free( buf );
return ret;
}
/***
****
***/
static tr_bool
announceURLIsSupported( const char * announce )
{
return ( announce != NULL )
&& ( ( strstr( announce, "http://" ) == announce ) ||
( strstr( announce, "https://" ) == announce ) );
}
static void
addTorrentToTier( tr_announcer * announcer, tr_torrent_tiers * tiers, tr_torrent * tor )
{
int i, n;
const tr_tracker_info ** infos;
const int trackerCount = tor->info.trackerCount;
const tr_tracker_info * trackers = tor->info.trackers;
/* get the trackers that we support... */
infos = tr_new0( const tr_tracker_info*, trackerCount );
for( i=n=0; i<trackerCount; ++i )
if( announceURLIsSupported( trackers[i].announce ) )
infos[n++] = &trackers[i];
/* build our private table of tiers... */
if( n > 0 )
{
int tierIndex = -1;
tr_tier * tier = NULL;
for( i=0; i<n; ++i )
{
const tr_tracker_info * info = infos[i];
if( info->tier != tierIndex )
tier = NULL;
tierIndex = info->tier;
if( tier == NULL ) {
tier = tierNew( tor );
dbgmsg( tier, "adding tier" );
tr_ptrArrayAppend( &tiers->tiers, tier );
}
tierAddTracker( announcer, tier, info->announce, info->scrape, info->id );
}
}
tr_free( infos );
}
tr_torrent_tiers *
tr_announcerAddTorrent( tr_announcer * announcer, tr_torrent * tor )
{
tr_torrent_tiers * tiers;
assert( announcer != NULL );
assert( tr_isTorrent( tor ) );
tiers = tiersNew( );
addTorrentToTier( announcer, tiers, tor );
return tiers;
}
static void
tierAddAnnounce( tr_tier * tier, const char * announceEvent, time_t announceAt );
void
tr_announcerResetTorrent( tr_announcer * announcer, tr_torrent * tor )
{
tr_ptrArray oldTiers = TR_PTR_ARRAY_INIT;
/* if we had tiers already, make a backup of them */
if( tor->tiers != NULL )
{
oldTiers = tor->tiers->tiers;
tor->tiers->tiers = TR_PTR_ARRAY_INIT;
}
/* create the new tier/tracker structs */
addTorrentToTier( announcer, tor->tiers, tor );
/* if we had tiers already, merge their state into the new structs */
if( !tr_ptrArrayEmpty( &oldTiers ) )
{
int i, in;
for( i=0, in=tr_ptrArraySize(&oldTiers); i<in; ++i )
{
int j, jn;
const tr_tier * o = tr_ptrArrayNth( &oldTiers, i );
if( o->currentTracker == NULL )
continue;
for( j=0, jn=tr_ptrArraySize(&tor->tiers->tiers); j<jn; ++j )
{
int k, kn;
tr_tier * t = tr_ptrArrayNth(&tor->tiers->tiers,j);
for( k=0, kn=tr_ptrArraySize(&t->trackers); k<kn; ++k )
{
tr_tracker_item * item = tr_ptrArrayNth(&t->trackers,k);
if( strcmp( o->currentTracker->announce, item->announce ) )
continue;
tierCopyAttributes( t, o );
t->currentTracker = item;
t->currentTrackerIndex = k;
t->wasCopied = TRUE;
trackerItemCopyAttributes( item, o->currentTracker );
dbgmsg( t, "attributes copied to tier %d, tracker %d"
"from tier %d, tracker %d",
i, o->currentTrackerIndex, j, k );
}
}
}
}
/* kickstart any tiers that didn't get started */
if( tor->isRunning )
{
int i, n;
const time_t now = tr_time( );
tr_tier ** tiers = (tr_tier**) tr_ptrArrayPeek( &tor->tiers->tiers, &n );
for( i=0; i<n; ++i ) {
tr_tier * tier = tiers[i];
if( !tier->wasCopied )
tierAddAnnounce( tier, STARTED, now );
}
}
/* cleanup */
tr_ptrArrayDestruct( &oldTiers, tierFree );
}
tr_publisher_tag
tr_announcerSubscribe( struct tr_torrent_tiers * tiers,
tr_delivery_func func,
void * userData )
{
return tr_publisherSubscribe( &tiers->publisher, func, userData );
}
void
tr_announcerUnsubscribe( struct tr_torrent_tiers * tiers,
tr_publisher_tag tag )
{
if( tiers )
tr_publisherUnsubscribe( &tiers->publisher, tag );
}
static tr_bool
tierCanManualAnnounce( const tr_tier * tier )
{
return tier->isRunning
&& tier->manualAnnounceAllowedAt <= tr_time( );
}
tr_bool
tr_announcerCanManualAnnounce( const tr_torrent * tor )
{
int i;
int n;
const tr_tier ** tiers;
assert( tr_isTorrent( tor ) );
assert( tor->tiers != NULL );
n = tr_ptrArraySize( &tor->tiers->tiers );
tiers = (const tr_tier**) tr_ptrArrayBase( &tor->tiers->tiers );
for( i=0; i<n; ++i )
if( tierCanManualAnnounce( tiers[i] ) )
return TRUE;
return FALSE;
}
time_t
tr_announcerNextManualAnnounce( const tr_torrent * tor )
{
int i;
int n;
const tr_torrent_tiers * tiers;
time_t ret = ~(time_t)0;
assert( tr_isTorrent( tor ) );
tiers = tor->tiers;
n = tr_ptrArraySize( &tiers->tiers );
for( i=0; i<n; ++i ) {
tr_tier * tier = tr_ptrArrayNth( (tr_ptrArray*)&tiers->tiers, i );
if( tier->isRunning )
ret = MIN( ret, tier->manualAnnounceAllowedAt );
}
return ret;
}
static void
tierAddAnnounce( tr_tier * tier, const char * announceEvent, time_t announceAt )
{
assert( tier != NULL );
assert( announceEvent != NULL );
tr_ptrArrayAppend( &tier->announceEvents, (void*)announceEvent );
tier->announceAt = announceAt;
dbgmsg( tier, "appended event \"%s\"; announcing in %d seconds\n", announceEvent, (int)difftime(announceAt,time(NULL)) );
}
static void
torrentAddAnnounce( tr_torrent * tor, const char * announceEvent, time_t announceAt )
{
int i;
int n;
tr_torrent_tiers * tiers;
assert( tr_isTorrent( tor ) );
tiers = tor->tiers;
n = tr_ptrArraySize( &tiers->tiers );
for( i=0; i<n; ++i )
tierAddAnnounce( tr_ptrArrayNth( &tiers->tiers, i ), announceEvent, announceAt );
}
void
tr_announcerTorrentStarted( tr_torrent * tor )
{
torrentAddAnnounce( tor, STARTED, tr_time( ) );
}
void
tr_announcerManualAnnounce( tr_torrent * tor )
{
torrentAddAnnounce( tor, "", tr_time( ) );
}
void
tr_announcerTorrentStopped( tr_torrent * tor )
{
torrentAddAnnounce( tor, "stopped", tr_time( ) );
}
void
tr_announcerTorrentCompleted( tr_torrent * tor )
{
torrentAddAnnounce( tor, "completed", tr_time( ) );
}
void
tr_announcerChangeMyPort( tr_torrent * tor )
{
tr_announcerTorrentStarted( tor );
}
/***
****
***/
void
tr_announcerAddBytes( tr_torrent * tor, int type, uint32_t byteCount )
{
int i, n;
tr_torrent_tiers * tiers;
assert( tr_isTorrent( tor ) );
assert( type==TR_ANN_UP || type==TR_ANN_DOWN || type==TR_ANN_CORRUPT );
tiers = tor->tiers;
n = tr_ptrArraySize( &tiers->tiers );
for( i=0; i<n; ++i )
{
tr_tier * tier = tr_ptrArrayNth( &tiers->tiers, i );
tier->byteCounts[ type ] += byteCount;
}
}
/***
****
***/
void
tr_announcerRemoveTorrent( tr_announcer * announcer, tr_torrent * tor )
{
assert( tr_isTorrent( tor ) );
if( tor->tiers )
{
int i;
const int n = tr_ptrArraySize( &tor->tiers->tiers );
for( i=0; i<n; ++i )
{
tr_tier * tier = tr_ptrArrayNth( &tor->tiers->tiers, i );
if( tier->isRunning )
{
struct stop_message * s = tr_new0( struct stop_message, 1 );
s->up = tier->byteCounts[TR_ANN_UP];
s->down = tier->byteCounts[TR_ANN_DOWN];
s->url = createAnnounceURL( announcer, tor, tier, "stopped" );
s->host = tier->currentTracker->host;
tr_ptrArrayInsertSorted( &announcer->stops, s, compareStops );
}
}
tiersFree( tor->tiers );
tor->tiers = NULL;
}
}
/* return true if (1) we've tried it recently AND (2) it didn't respond... */
static tr_bool
hostIsNotResponding( const tr_host * host, const time_t now )
{
tr_bool b = ( host->lastRequestTime )
&& ( host->lastRequestTime >= ( now - SLOW_HOST_PENALTY_SECS ) )
&& ( host->lastResponseInterval > MAX_TRACKER_RESPONSE_TIME_SECS );
return b;
}
static tr_bool
tierIsNotResponding( const tr_tier * tier, const time_t now )
{
return !tier->currentTracker
|| hostIsNotResponding( tier->currentTracker->host, now );
}
static int
getRetryInterval( const tr_host * host )
{
int interval;
const int jitter = tr_cryptoWeakRandInt( 120 );
const time_t timeSinceLastSuccess = tr_time() - host->lastSuccessfulRequest;
if( timeSinceLastSuccess < 15*60 ) interval = 0;
else if( timeSinceLastSuccess < 30*60 ) interval = 60*4;
else if( timeSinceLastSuccess < 45*60 ) interval = 60*8;
else if( timeSinceLastSuccess < 60*60 ) interval = 60*16;
else interval = 60*32;
return interval + jitter;
}
static int
compareTiers( const void * va, const void * vb )
{
int ret = 0;
tr_bool af, bf;
const tr_tier * a = *(const tr_tier**)va;
const tr_tier * b = *(const tr_tier**)vb;
/* working domains come before non-working */
if( !ret ) {
const time_t now = tr_time( );
af = tierIsNotResponding( a, now );
bf = tierIsNotResponding( b, now );
if( af != bf )
ret = !af ? -1 : 1;
}
/* stops come before starts */
if( !ret ) {
af = a->tor->isRunning;
bf = b->tor->isRunning;
if( af != bf )
ret = af ? 1 : -1;
}
/* upload comes before download */
if( !ret )
ret = compareTransfer( a->byteCounts[TR_ANN_UP], a->byteCounts[TR_ANN_DOWN],
b->byteCounts[TR_ANN_UP], b->byteCounts[TR_ANN_DOWN] );
/* incomplete comes before complete */
if( !ret ) {
af = a->tor->completeness == TR_LEECH;
bf = b->tor->completeness == TR_LEECH;
if( af != bf )
return af ? -1 : 1;
}
/* private before public */
if( !ret ) {
af = tr_torrentIsPrivate( a->tor );
bf = tr_torrentIsPrivate( b->tor );
if( af != bf )
ret = af ? -1 : 1;
}
return ret;
}
static uint8_t *
parseOldPeers( tr_benc * bePeers, size_t * byteCount )
{
int i;
uint8_t * array, *walk;
const int peerCount = bePeers->val.l.count;
assert( tr_bencIsList( bePeers ) );
array = tr_new( uint8_t, peerCount * ( sizeof( tr_address ) + 2 ) );
for( i = 0, walk = array; i < peerCount; ++i )
{
const char * s;
int64_t itmp;
tr_address addr;
tr_port port;
tr_benc * peer = &bePeers->val.l.vals[i];
if( tr_bencDictFindStr( peer, "ip", &s ) )
if( tr_pton( s, &addr ) == NULL )
continue;
if( !tr_bencDictFindInt( peer, "port", &itmp )
|| itmp < 0
|| itmp > USHRT_MAX )
continue;
memcpy( walk, &addr, sizeof( tr_address ) );
port = htons( itmp );
memcpy( walk + sizeof( tr_address ), &port, 2 );
walk += sizeof( tr_address ) + 2;
}
*byteCount = peerCount * sizeof( tr_address ) + 2;
return array;
}
static tr_bool
parseAnnounceResponse( tr_tier * tier,
const char * response,
size_t responseLen,
tr_bool * gotScrape )
{
tr_benc benc;
tr_bool success = FALSE;
int scrapeFields = 0;
const int bencLoaded = !tr_bencLoad( response, responseLen, &benc, NULL );
if( getenv( "TR_CURL_VERBOSE" ) != NULL )
{
char * str = tr_bencToStr( &benc, TR_FMT_JSON, NULL );
fprintf( stderr, "Announce response:\n< %s\n", str );
tr_free( str );
}
dbgmsg( tier, "response len: %d, isBenc: %d", (int)responseLen, (int)bencLoaded );
publishErrorClear( tier );
if( bencLoaded && tr_bencIsDict( &benc ) )
{
int peerCount = 0;
size_t rawlen;
int64_t i;
tr_benc * tmp;
const char * str;
const uint8_t * raw;
tr_bool gotPeers = FALSE;
success = TRUE;
if( tr_bencDictFindStr( &benc, "failure reason", &str ) )
{
tr_strlcpy( tier->lastAnnounceStr, str,
sizeof( tier->lastAnnounceStr ) );
dbgmsg( tier, "tracker gave \"%s\"", str );
publishMessage( tier, str, TR_TRACKER_ERROR );
success = FALSE;
}
if( tr_bencDictFindStr( &benc, "warning message", &str ) )
{
tr_strlcpy( tier->lastAnnounceStr, str,
sizeof( tier->lastAnnounceStr ) );
dbgmsg( tier, "tracker gave \"%s\"", str );
publishWarning( tier, str );
}
if( tr_bencDictFindInt( &benc, "interval", &i ) )
{
dbgmsg( tier, "setting interval to %d", (int)i );
tier->announceIntervalSec = i;
}
if( tr_bencDictFindInt( &benc, "min interval", &i ) )
{
dbgmsg( tier, "setting min interval to %d", (int)i );
tier->announceMinIntervalSec = i;
}
if( tr_bencDictFindStr( &benc, "tracker id", &str ) )
{
tier->currentTracker->tracker_id = tr_strdup( str );
}
if( !tr_bencDictFindInt( &benc, "complete", &i ) )
tier->currentTracker->seederCount = 0;
else {
++scrapeFields;
tier->currentTracker->seederCount = i;
}
if( !tr_bencDictFindInt( &benc, "incomplete", &i ) )
tier->currentTracker->leecherCount = 0;
else {
++scrapeFields;
tier->currentTracker->leecherCount = i;
}
if( tr_bencDictFindInt( &benc, "downloaded", &i ) )
{
++scrapeFields;
tier->currentTracker->downloadCount = i;
}
if( tr_bencDictFindRaw( &benc, "peers", &raw, &rawlen ) )
{
/* "compact" extension */
const int seeders = tier->currentTracker->seederCount;
const int leechers = tier->currentTracker->leecherCount;
peerCount += publishNewPeersCompact( tier, seeders, leechers, raw, rawlen );
gotPeers = TRUE;
}
else if( tr_bencDictFindList( &benc, "peers", &tmp ) )
{
/* original version of peers */
const int seeders = tier->currentTracker->seederCount;
const int leechers = tier->currentTracker->leecherCount;
size_t byteCount = 0;
uint8_t * array = parseOldPeers( tmp, &byteCount );
peerCount += publishNewPeers( tier, seeders, leechers, array, byteCount );
gotPeers = TRUE;
tr_free( array );
}
if( tr_bencDictFindRaw( &benc, "peers6", &raw, &rawlen ) )
{
/* "compact" extension */
const int seeders = tier->currentTracker->seederCount;
const int leechers = tier->currentTracker->leecherCount;
peerCount += publishNewPeersCompact6( tier, seeders, leechers, raw, rawlen );
gotPeers = TRUE;
}
if( tier->lastAnnounceStr[0] == '\0' )
tr_strlcpy( tier->lastAnnounceStr, _( "Success" ),
sizeof( tier->lastAnnounceStr ) );
if( gotPeers )
tier->lastAnnouncePeerCount = peerCount;
}
if( bencLoaded )
tr_bencFree( &benc );
*gotScrape = scrapeFields >= 2;
return success;
}
struct announce_data
{
int torrentId;
int tierId;
time_t timeSent;
const char * event;
/** If the request succeeds, the value for tier's "isRunning" flag */
tr_bool isRunningOnSuccess;
};
static void
onAnnounceDone( tr_session * session,
long responseCode,
const void * response,
size_t responseLen,
void * vdata )
{
tr_announcer * announcer = session->announcer;
struct announce_data * data = vdata;
tr_tier * tier = getTier( announcer, data->torrentId, data->tierId );
tr_bool gotScrape = FALSE;
tr_bool success = FALSE;
const time_t now = time ( NULL );
const char * announceEvent = data->event;
const tr_bool isStopped = !strcmp( announceEvent, "stopped" );
if( announcer && tier )
{
if( tier->currentTracker->host )
{
tr_host * host = tier->currentTracker->host;
host->lastRequestTime = data->timeSent;
host->lastResponseInterval = now - data->timeSent;
}
tier->lastAnnounceTime = now;
if( responseCode == HTTP_OK )
{
success = parseAnnounceResponse( tier, response, responseLen, &gotScrape );
dbgmsg( tier, "success is %d", success );
if( isStopped )
{
/* now that we've successfully stopped the torrent,
* we can reset the up/down/corrupt count we've kept
* for this tracker */
tier->byteCounts[ TR_ANN_UP ] = 0;
tier->byteCounts[ TR_ANN_DOWN ] = 0;
tier->byteCounts[ TR_ANN_CORRUPT ] = 0;
}
}
else if( responseCode )
{
/* %1$ld - http status code, such as 404
* %2$s - human-readable explanation of the http status code */
char * buf = tr_strdup_printf(
_( "tracker gave HTTP Response Code %1$ld (%2$s)" ),
responseCode,
tr_webGetResponseStr( responseCode ) );
tr_strlcpy( tier->lastAnnounceStr, buf,
sizeof( tier->lastAnnounceStr ) );
/* if the response is serious, *and* if the response may require
* human intervention, then notify the user... otherwise just log it */
if( responseCode >= 400 )
if( tr_torrentIsPrivate( tier->tor ) || ( tier->tor->info.trackerCount < 2 ) )
publishWarning( tier, buf );
tr_torinf( tier->tor, "%s", buf );
dbgmsg( tier, "%s", buf );
tr_free( buf );
}
else
{
tr_strlcpy( tier->lastAnnounceStr,
_( "tracker did not respond" ),
sizeof( tier->lastAnnounceStr ) );
dbgmsg( tier, "%s", tier->lastAnnounceStr );
}
}
if( tier )
{
tier->isAnnouncing = FALSE;
if( responseCode == 0 )
{
const int interval = getRetryInterval( tier->currentTracker->host );
dbgmsg( tier, "No response from tracker... retrying in %d seconds.", interval );
tier->manualAnnounceAllowedAt = ~(time_t)0;
tierAddAnnounce( tier, announceEvent, now + interval );
}
else if( 200 <= responseCode && responseCode <= 299 )
{
const int interval = tier->announceIntervalSec;
dbgmsg( tier, "request succeeded. reannouncing in %d seconds", interval );
if( gotScrape )
{
tier->lastScrapeTime = now;
tier->lastScrapeSucceeded = 1;
tier->scrapeAt = now + tier->scrapeIntervalSec;
}
tier->manualAnnounceAllowedAt = now + tier->announceMinIntervalSec;
/* if we're running and the queue is empty, add the next update */
if( !isStopped && !tr_ptrArraySize( &tier->announceEvents ) )
{
tierAddAnnounce( tier, "", now + interval );
}
}
else if( 300 <= responseCode && responseCode <= 399 )
{
/* how did this get here? libcurl handles this */
const int interval = 5;
dbgmsg( tier, "got a redirect. retrying in %d seconds", interval );
tierAddAnnounce( tier, announceEvent, now + interval );
tier->manualAnnounceAllowedAt = now + tier->announceMinIntervalSec;
}
else if( ( responseCode == 404 ) || ( 500 <= responseCode && responseCode <= 599 ) )
{
/* 404: The requested resource could not be found but may be
* available again in the future. Subsequent requests by
* the client are permissible. */
/* 5xx: indicate cases in which the server is aware that it
* has erred or is incapable of performing the request.
* So we pause a bit and try again. */
const int interval = getRetryInterval( tier->currentTracker->host );
tier->manualAnnounceAllowedAt = ~(time_t)0;
tierAddAnnounce( tier, announceEvent, now + interval );
}
else if( 400 <= responseCode && responseCode <= 499 )
{
/* The request could not be understood by the server due to
* malformed syntax. The client SHOULD NOT repeat the
* request without modifications. */
if( tr_torrentIsPrivate( tier->tor ) || ( tier->tor->info.trackerCount < 2 ) )
publishErrorMessageAndStop( tier, _( "Tracker returned a 4xx message" ) );
tier->announceAt = 0;
tier->manualAnnounceAllowedAt = ~(time_t)0;
}
else
{
/* WTF did we get?? */
const int interval = 120;
dbgmsg( tier, "Invalid response from tracker... retrying in two minutes." );
tier->manualAnnounceAllowedAt = ~(time_t)0;
tierAddAnnounce( tier, announceEvent, now + interval );
}
tier->lastAnnounceSucceeded = success;
tier->lastAnnounceTimedOut = responseCode == 0;
if( success )
{
tier->isRunning = data->isRunningOnSuccess;
if( tier->currentTracker->host )
tier->currentTracker->host->lastSuccessfulRequest = now;
}
else if( responseCode != HTTP_OK )
{
tierIncrementTracker( tier );
tr_ptrArrayInsert( &tier->announceEvents, (void*)announceEvent, 0 );
}
}
if( announcer != NULL )
{
++announcer->slotsAvailable;
}
tr_free( data );
}
static const char*
getNextAnnounceEvent( tr_tier * tier )
{
int i, n;
int pos = -1;
tr_ptrArray tmp;
const char ** events;
const char * str = NULL;
assert( tier != NULL );
assert( tr_isTorrent( tier->tor ) );
events = (const char**) tr_ptrArrayPeek( &tier->announceEvents, &n );
/* special case #1: if "stopped" is in the queue,
* ignore everything before it except "completed" */
if( pos == -1 ) {
tr_bool completed = FALSE;
for( i = 0; i < n; ++i ) {
if( !strcmp( events[i], "completed" ) )
completed = TRUE;
if( !strcmp( events[i], "stopped" ) )
break;
}
if( !completed && ( i < n ) )
pos = i;
}
/* special case #2: don't use empty strings if something follows them */
if( pos == -1 ) {
for( i = 0; i < n; ++i )
if( *events[i] )
break;
if( i < n )
pos = i;
}
/* default: use the next in the queue */
if( ( pos == -1 ) && ( n > 0 ) )
pos = 0;
/* special case #3: if there are duplicate requests in a row, skip to the last one */
if( pos >= 0 ) {
for( i=pos+1; i<n; ++i )
if( strcmp( events[pos], events[i] ) )
break;
pos = i - 1;
}
/* special case #4: BEP 21: "In order to tell the tracker that a peer is a
* partial seed, it MUST send an event=paused parameter in every
* announce while it is a partial seed." */
str = pos>=0 ? events[pos] : NULL;
if( tr_cpGetStatus( &tier->tor->completion ) == TR_PARTIAL_SEED )
if( !str || strcmp( str, "stopped" ) )
str = "paused";
#if 0
for( i=0; i<n; ++i ) fprintf( stderr, "(%d)\"%s\" ", i, events[i] );
fprintf( stderr, "\n" );
fprintf( stderr, "using (%d)\"%s\"\n", pos, events[pos] );
if( strcmp( events[pos], str ) ) fprintf( stderr, "...but really using [%s]\n", str );
#endif
/* announceEvents array upkeep */
tmp = TR_PTR_ARRAY_INIT;
for( i=pos+1; i<n; ++i )
tr_ptrArrayAppend( &tmp, (void*)events[i] );
tr_ptrArrayDestruct( &tier->announceEvents, NULL );
tier->announceEvents = tmp;
return str;
}
static void
tierAnnounce( tr_announcer * announcer, tr_tier * tier )
{
const char * announceEvent = getNextAnnounceEvent( tier );
assert( !tier->isAnnouncing );
if( announceEvent != NULL )
{
char * url;
struct announce_data * data;
const tr_torrent * tor = tier->tor;
const time_t now = tr_time( );
data = tr_new0( struct announce_data, 1 );
data->torrentId = tr_torrentId( tor );
data->tierId = tier->key;
data->isRunningOnSuccess = tor->isRunning;
data->timeSent = now;
data->event = announceEvent;
url = createAnnounceURL( announcer, tor, tier, data->event );
tier->isAnnouncing = TRUE;
tier->lastAnnounceStartTime = now;
--announcer->slotsAvailable;
tr_webRun( announcer->session, url, NULL, onAnnounceDone, data );
tr_free( url );
}
}
static tr_bool
parseScrapeResponse( tr_tier * tier,
const char * response,
size_t responseLen,
char * result,
size_t resultlen )
{
tr_bool success = FALSE;
tr_benc benc, *files;
const int bencLoaded = !tr_bencLoad( response, responseLen, &benc, NULL );
if( bencLoaded && tr_bencDictFindDict( &benc, "files", &files ) )
{
const char * key;
tr_benc * val;
int i = 0;
while( tr_bencDictChild( files, i++, &key, &val ))
{
int64_t intVal;
tr_benc * flags;
if( memcmp( tier->tor->info.hash, key, SHA_DIGEST_LENGTH ) )
continue;
success = TRUE;
publishErrorClear( tier );
if( ( tr_bencDictFindInt( val, "complete", &intVal ) ) )
tier->currentTracker->seederCount = intVal;
if( ( tr_bencDictFindInt( val, "incomplete", &intVal ) ) )
tier->currentTracker->leecherCount = intVal;
if( ( tr_bencDictFindInt( val, "downloaded", &intVal ) ) )
tier->currentTracker->downloadCount = intVal;
if( ( tr_bencDictFindInt( val, "downloaders", &intVal ) ) )
tier->currentTracker->downloaderCount = intVal;
if( tr_bencDictFindDict( val, "flags", &flags ) )
if( ( tr_bencDictFindInt( flags, "min_request_interval", &intVal ) ) )
tier->scrapeIntervalSec = MAX( DEFAULT_SCRAPE_INTERVAL_SEC, (int)intVal );
tr_tordbg( tier->tor,
"Scrape successful. Rescraping in %d seconds.",
tier->scrapeIntervalSec );
}
}
if( bencLoaded )
tr_bencFree( &benc );
if( success )
tr_strlcpy( result, _( "Success" ), resultlen );
else
tr_strlcpy( result, _( "Error parsing response" ), resultlen );
return success;
}
static void
onScrapeDone( tr_session * session,
long responseCode,
const void * response,
size_t responseLen,
void * vdata )
{
tr_bool success = FALSE;
tr_announcer * announcer = session->announcer;
struct announce_data * data = vdata;
tr_tier * tier = getTier( announcer, data->torrentId, data->tierId );
const time_t now = tr_time( );
if( announcer )
++announcer->slotsAvailable;
if( announcer && tier )
{
tier->isScraping = FALSE;
tier->lastScrapeTime = now;
if( tier->currentTracker->host )
{
tr_host * host = tier->currentTracker->host;
host->lastRequestTime = data->timeSent;
host->lastResponseInterval = now - data->timeSent;
}
if( 200 <= responseCode && responseCode <= 299 )
{
const int interval = tier->scrapeIntervalSec;
tier->scrapeAt = now + interval;
if( responseCode == HTTP_OK )
success = parseScrapeResponse( tier, response, responseLen,
tier->lastScrapeStr, sizeof( tier->lastScrapeStr ) );
else
tr_snprintf( tier->lastScrapeStr, sizeof( tier->lastScrapeStr ),
_( "tracker gave HTTP Response Code %1$ld (%2$s)" ),
responseCode, tr_webGetResponseStr( responseCode ) );
tr_tordbg( tier->tor, "%s", tier->lastScrapeStr );
}
else if( 300 <= responseCode && responseCode <= 399 )
{
/* this shouldn't happen; libcurl should handle this */
const int interval = 5;
tier->scrapeAt = now + interval;
tr_snprintf( tier->lastScrapeStr, sizeof( tier->lastScrapeStr ),
"Got a redirect. Retrying in %d seconds", interval );
tr_tordbg( tier->tor, "%s", tier->lastScrapeStr );
}
else
{
const int interval = getRetryInterval( tier->currentTracker->host );
/* Don't retry on a 4xx.
* Retry at growing intervals on a 5xx */
if( 400 <= responseCode && responseCode <= 499 )
tier->scrapeAt = 0;
else
tier->scrapeAt = now + interval;
/* %1$ld - http status code, such as 404
* %2$s - human-readable explanation of the http status code */
if( !responseCode )
tr_strlcpy( tier->lastScrapeStr, _( "tracker did not respond" ),
sizeof( tier->lastScrapeStr ) );
else
tr_snprintf( tier->lastScrapeStr, sizeof( tier->lastScrapeStr ),
_( "tracker gave HTTP Response Code %1$ld (%2$s)" ),
responseCode, tr_webGetResponseStr( responseCode ) );
}
tier->lastScrapeSucceeded = success;
tier->lastScrapeTimedOut = responseCode == 0;
if( success && tier->currentTracker->host )
tier->currentTracker->host->lastSuccessfulRequest = now;
}
tr_free( data );
}
static void
tierScrape( tr_announcer * announcer, tr_tier * tier )
{
char * url;
const char * scrape;
struct announce_data * data;
const time_t now = tr_time( );
assert( tier );
assert( !tier->isScraping );
assert( tier->currentTracker != NULL );
assert( tr_isTorrent( tier->tor ) );
data = tr_new0( struct announce_data, 1 );
data->torrentId = tr_torrentId( tier->tor );
data->tierId = tier->key;
scrape = tier->currentTracker->scrape;
url = tr_strdup_printf( "%s%cinfo_hash=%s",
scrape,
strchr( scrape, '?' ) ? '&' : '?',
tier->tor->info.hashEscaped );
tier->isScraping = TRUE;
tier->lastScrapeStartTime = now;
--announcer->slotsAvailable;
dbgmsg( tier, "scraping \"%s\"", url );
tr_webRun( announcer->session, url, NULL, onScrapeDone, data );
tr_free( url );
}
static void
flushCloseMessages( tr_announcer * announcer )
{
int i;
const int n = tr_ptrArraySize( &announcer->stops );
for( i=0; i<n; ++i )
{
struct stop_message * stop = tr_ptrArrayNth( &announcer->stops, i );
tr_webRun( announcer->session, stop->url, NULL, NULL, NULL );
stopFree( stop );
}
tr_ptrArrayClear( &announcer->stops );
}
static tr_bool
tierNeedsToAnnounce( const tr_tier * tier, const time_t now )
{
return !tier->isAnnouncing
&& !tier->isScraping
&& ( tier->announceAt != 0 )
&& ( tier->announceAt <= now )
&& ( tr_ptrArraySize( &tier->announceEvents ) != 0 );
}
static tr_bool
tierNeedsToScrape( const tr_tier * tier, const time_t now )
{
return ( !tier->isScraping )
&& ( tier->scrapeAt != 0 )
&& ( tier->scrapeAt <= now )
&& ( tier->currentTracker != NULL )
&& ( tier->currentTracker->scrape != NULL );
}
static void
announceMore( tr_announcer * announcer )
{
tr_torrent * tor = NULL;
const time_t now = tr_time( );
if( announcer->slotsAvailable > 0 )
{
int i;
int n;
tr_ptrArray announceMe = TR_PTR_ARRAY_INIT;
tr_ptrArray scrapeMe = TR_PTR_ARRAY_INIT;
/* build a list of tiers that need to be announced */
while(( tor = tr_torrentNext( announcer->session, tor ))) {
if( tor->tiers ) {
n = tr_ptrArraySize( &tor->tiers->tiers );
for( i=0; i<n; ++i ) {
tr_tier * tier = tr_ptrArrayNth( &tor->tiers->tiers, i );
if( tierNeedsToAnnounce( tier, now ) )
tr_ptrArrayAppend( &announceMe, tier );
else if( tierNeedsToScrape( tier, now ) )
tr_ptrArrayAppend( &scrapeMe, tier );
}
}
}
/* if there are more tiers than slots available, prioritize */
n = tr_ptrArraySize( &announceMe );
if( n > announcer->slotsAvailable )
qsort( tr_ptrArrayBase( &announceMe ), n, sizeof( tr_tier * ), compareTiers );
/* announce some */
n = MIN( tr_ptrArraySize( &announceMe ), announcer->slotsAvailable );
for( i=0; i<n; ++i ) {
tr_tier * tier = tr_ptrArrayNth( &announceMe, i );
dbgmsg( tier, "announcing tier %d of %d", i, n );
tierAnnounce( announcer, tier );
}
/* scrape some */
n = MIN( tr_ptrArraySize( &scrapeMe ), announcer->slotsAvailable );
for( i=0; i<n; ++i ) {
tr_tier * tier = tr_ptrArrayNth( &scrapeMe, i );
dbgmsg( tier, "scraping tier %d of %d", (i+1), n );
tierScrape( announcer, tier );
}
#if 0
char timebuf[64];
tr_getLogTimeStr( timebuf, 64 );
fprintf( stderr, "[%s] announce.c has %d requests ready to send (announce: %d, scrape: %d)\n", timebuf, (int)(tr_ptrArraySize(&announceMe)+tr_ptrArraySize(&scrapeMe)), (int)tr_ptrArraySize(&announceMe), (int)tr_ptrArraySize(&scrapeMe) );
#endif
/* cleanup */
tr_ptrArrayDestruct( &scrapeMe, NULL );
tr_ptrArrayDestruct( &announceMe, NULL );
}
tor = NULL;
while(( tor = tr_torrentNext( announcer->session, tor ))) {
if( tor->dhtAnnounceAt <= now ) {
if( tor->isRunning && tr_torrentAllowsDHT(tor) ) {
int rc;
rc = tr_dhtAnnounce(tor, AF_INET, 1);
if(rc == 0)
/* The DHT is not ready yet. Try again soon. */
tor->dhtAnnounceAt = now + 5 + tr_cryptoWeakRandInt( 5 );
else
/* We should announce at least once every 30 minutes. */
tor->dhtAnnounceAt =
now + 25 * 60 + tr_cryptoWeakRandInt( 3 * 60 );
}
}
if( tor->dhtAnnounce6At <= now ) {
if( tor->isRunning && tr_torrentAllowsDHT(tor) ) {
int rc;
rc = tr_dhtAnnounce(tor, AF_INET6, 1);
if(rc == 0)
tor->dhtAnnounce6At = now + 5 + tr_cryptoWeakRandInt( 5 );
else
tor->dhtAnnounce6At =
now + 25 * 60 + tr_cryptoWeakRandInt( 3 * 60 );
}
}
}
/* Local Peer Discovery */
if( announcer->lpdHouseKeepingAt <= now )
{
tr_lpdAnnounceMore( now, LPD_HOUSEKEEPING_INTERVAL_SECS );
/* reschedule more LDS announces for ( the future + jitter ) */
announcer->lpdHouseKeepingAt =
calcRescheduleWithJitter( LPD_HOUSEKEEPING_INTERVAL_SECS );
}
}
static void
onUpkeepTimer( int foo UNUSED, short bar UNUSED, void * vannouncer )
{
tr_announcer * announcer = vannouncer;
tr_sessionLock( announcer->session );
/* maybe send out some "stopped" messages for closed torrents */
flushCloseMessages( announcer );
/* maybe send out some announcements to trackers */
announceMore( announcer );
/* set up the next timer */
tr_timerAdd( announcer->upkeepTimer, UPKEEP_INTERVAL_SECS, 0 );
tr_sessionUnlock( announcer->session );
}
/***
****
***/
tr_tracker_stat *
tr_announcerStats( const tr_torrent * torrent,
int * setmeTrackerCount )
{
int i;
int n;
int out = 0;
int tierCount;
tr_tracker_stat * ret;
const time_t now = tr_time( );
assert( tr_isTorrent( torrent ) );
/* count the trackers... */
for( i=n=0, tierCount=tr_ptrArraySize( &torrent->tiers->tiers ); i<tierCount; ++i ) {
const tr_tier * tier = tr_ptrArrayNth( &torrent->tiers->tiers, i );
n += tr_ptrArraySize( &tier->trackers );
}
/* alloc the stats */
*setmeTrackerCount = n;
ret = tr_new0( tr_tracker_stat, n );
/* populate the stats */
for( i=0, tierCount=tr_ptrArraySize( &torrent->tiers->tiers ); i<tierCount; ++i )
{
int j;
const tr_tier * tier = tr_ptrArrayNth( &torrent->tiers->tiers, i );
n = tr_ptrArraySize( &tier->trackers );
for( j=0; j<n; ++j )
{
const tr_tracker_item * tracker = tr_ptrArrayNth( (tr_ptrArray*)&tier->trackers, j );
tr_tracker_stat * st = ret + out++;
st->id = tracker->id;
tr_strlcpy( st->host, tracker->host->name, sizeof( st->host ) );
tr_strlcpy( st->announce, tracker->announce, sizeof( st->announce ) );
st->tier = i;
st->isBackup = tracker != tier->currentTracker;
st->lastScrapeStartTime = tier->lastScrapeStartTime;
st->seederCount = tracker->seederCount;
st->leecherCount = tracker->leecherCount;
st->downloadCount = tracker->downloadCount;
if( st->isBackup )
{
st->scrapeState = TR_TRACKER_INACTIVE;
st->announceState = TR_TRACKER_INACTIVE;
st->nextScrapeTime = 0;
st->nextAnnounceTime = 0;
}
else
{
if(( st->hasScraped = tier->lastScrapeTime != 0 )) {
st->lastScrapeTime = tier->lastScrapeTime;
st->lastScrapeSucceeded = tier->lastScrapeSucceeded;
st->lastScrapeTimedOut = tier->lastScrapeTimedOut;
tr_strlcpy( st->lastScrapeResult, tier->lastScrapeStr, sizeof( st->lastScrapeResult ) );
}
if( tier->isScraping )
st->scrapeState = TR_TRACKER_ACTIVE;
else if( !tier->scrapeAt )
st->scrapeState = TR_TRACKER_INACTIVE;
else if( tier->scrapeAt > now )
{
st->scrapeState = TR_TRACKER_WAITING;
st->nextScrapeTime = tier->scrapeAt;
}
else
st->scrapeState = TR_TRACKER_QUEUED;
st->lastAnnounceStartTime = tier->lastAnnounceStartTime;
if(( st->hasAnnounced = tier->lastAnnounceTime != 0 )) {
st->lastAnnounceTime = tier->lastAnnounceTime;
tr_strlcpy( st->lastAnnounceResult, tier->lastAnnounceStr, sizeof( st->lastAnnounceResult ) );
st->lastAnnounceSucceeded = tier->lastAnnounceSucceeded;
st->lastAnnounceTimedOut = tier->lastAnnounceTimedOut;
st->lastAnnouncePeerCount = tier->lastAnnouncePeerCount;
}
if( tier->isAnnouncing )
st->announceState = TR_TRACKER_ACTIVE;
else if( !torrent->isRunning || !tier->announceAt )
st->announceState = TR_TRACKER_INACTIVE;
else if( tier->announceAt > now )
{
st->announceState = TR_TRACKER_WAITING;
st->nextAnnounceTime = tier->announceAt;
}
else
st->announceState = TR_TRACKER_QUEUED;
}
}
}
return ret;
}
void
tr_announcerStatsFree( tr_tracker_stat * trackers,
int trackerCount UNUSED )
{
tr_free( trackers );
}
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