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transmission/libtransmission/announcer.cc

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// This file Copyright © 2010-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm>
#include <array>
#include <climits> /* INT_MAX */
#include <cstdio>
#include <cstring>
#include <ctime>
#include <deque>
#include <iterator>
#include <map>
#include <set>
#include <string>
#include <string_view>
#include <vector>
#include <event2/buffer.h>
#include <event2/event.h> /* evtimer */
#define LIBTRANSMISSION_ANNOUNCER_MODULE
#include "transmission.h"
#include "announce-list.h"
#include "announcer-common.h"
#include "announcer.h"
#include "crypto-utils.h" /* tr_rand_int(), tr_rand_int_weak() */
#include "log.h"
#include "peer-mgr.h" /* tr_peerMgrCompactToPex() */
#include "session.h"
#include "torrent.h"
#include "tr-assert.h"
#include "utils.h"
#include "web-utils.h"
using namespace std::literals;
#define dbgmsg(tier, ...) \
do \
{ \
if (tr_logGetDeepEnabled()) \
{ \
auto name = std::array<char, 128>{}; \
tier->buildLogName(std::data(name), std::size(name)); \
tr_logAddDeep(__FILE__, __LINE__, std::data(name), __VA_ARGS__); \
} \
} while (0)
/* unless the tracker says otherwise, rescrape this frequently */
static auto constexpr DefaultScrapeIntervalSec = int{ 60 * 30 };
/* unless the tracker says otherwise, this is the announce interval */
static auto constexpr DefaultAnnounceIntervalSec = int{ 60 * 10 };
/* unless the tracker says otherwise, this is the announce min_interval */
static auto constexpr DefaultAnnounceMinIntervalSec = int{ 60 * 2 };
/* the value of the 'numwant' argument passed in tracker requests. */
static auto constexpr Numwant = int{ 80 };
/* how often to announce & scrape */
static auto constexpr UpkeepIntervalMsec = int{ 500 };
static auto constexpr MaxAnnouncesPerUpkeep = int{ 20 };
static auto constexpr MaxScrapesPerUpkeep = int{ 20 };
/* this is how often to call the UDP tracker upkeep */
static auto constexpr TauUpkeepIntervalSecs = int{ 5 };
/* how many infohashes to remove when we get a scrape-too-long error */
static auto constexpr TrMultiscrapeStep = int{ 5 };
/***
****
***/
char const* tr_announce_event_get_string(tr_announce_event e)
{
switch (e)
{
case TR_ANNOUNCE_EVENT_COMPLETED:
return "completed";
case TR_ANNOUNCE_EVENT_STARTED:
return "started";
case TR_ANNOUNCE_EVENT_STOPPED:
return "stopped";
default:
return "";
}
}
namespace
{
struct StopsCompare
{
static int compare(tr_announce_request const* a, tr_announce_request const* b) // <=>
{
// primary key: volume of data transferred
auto const ax = a->up + a->down;
auto const bx = b->up + b->down;
if (ax < bx)
{
return -1;
}
if (ax > bx)
{
return 1;
}
// secondary key: the torrent's info_hash
if (a->info_hash < b->info_hash)
{
return -1;
}
if (a->info_hash > b->info_hash)
{
return 1;
}
// tertiary key: the tracker's announce url
if (a->announce_url < b->announce_url)
{
return -1;
}
if (a->announce_url > b->announce_url)
{
return 1;
}
return 0;
}
bool operator()(tr_announce_request const* a, tr_announce_request const* b) const // less than
{
return compare(a, b) < 0;
}
};
} // namespace
/***
****
***/
struct tr_scrape_info
{
tr_interned_string scrape_url;
int multiscrape_max;
tr_scrape_info(tr_interned_string scrape_url_in, int const multiscrape_max_in)
: scrape_url{ scrape_url_in }
, multiscrape_max{ multiscrape_max_in }
{
}
};
static void onUpkeepTimer(evutil_socket_t fd, short what, void* vannouncer);
/**
* "global" (per-tr_session) fields
*/
struct tr_announcer
{
explicit tr_announcer(tr_session* session_in)
: session{ session_in }
, upkeep_timer{ evtimer_new(session_in->event_base, onUpkeepTimer, this) }
{
scheduleNextUpdate();
}
~tr_announcer()
{
event_free(upkeep_timer);
}
void scheduleNextUpdate() const
{
tr_timerAddMsec(this->upkeep_timer, UpkeepIntervalMsec);
}
std::set<tr_announce_request*, StopsCompare> stops;
std::map<tr_interned_string, tr_scrape_info> scrape_info;
tr_session* const session;
event* const upkeep_timer;
int const key = tr_rand_int(INT_MAX);
time_t tau_upkeep_at = 0;
};
static tr_scrape_info* tr_announcerGetScrapeInfo(tr_announcer* announcer, tr_interned_string url)
{
if (std::empty(url))
{
return nullptr;
}
auto& scrapes = announcer->scrape_info;
auto const it = scrapes.try_emplace(url, url, TR_MULTISCRAPE_MAX);
return &it.first->second;
}
void tr_announcerInit(tr_session* session)
{
TR_ASSERT(tr_isSession(session));
auto* a = new tr_announcer{ session };
session->announcer = a;
}
static void flushCloseMessages(tr_announcer* announcer);
void tr_announcerClose(tr_session* session)
{
tr_announcer* announcer = session->announcer;
flushCloseMessages(announcer);
tr_tracker_udp_start_shutdown(session);
session->announcer = nullptr;
delete announcer;
}
/***
****
***/
/* a row in tr_tier's list of trackers */
struct tr_tracker
{
explicit tr_tracker(tr_announcer* announcer, tr_announce_list::tracker_info const& info)
: host{ info.host }
, announce_url{ info.announce_str }
, scrape_info{ std::empty(info.scrape_str) ? nullptr : tr_announcerGetScrapeInfo(announcer, info.scrape_str) }
, id{ info.id }
{
}
[[nodiscard]] int getRetryInterval() const
{
switch (consecutive_failures)
{
case 0:
return 0;
case 1:
return 20;
case 2:
return tr_rand_int_weak(60) + 60 * 5;
case 3:
return tr_rand_int_weak(60) + 60 * 15;
case 4:
return tr_rand_int_weak(60) + 60 * 30;
case 5:
return tr_rand_int_weak(60) + 60 * 60;
default:
return tr_rand_int_weak(60) + 60 * 120;
}
}
tr_interned_string const host;
tr_interned_string const announce_url;
tr_scrape_info* const scrape_info;
std::string tracker_id;
int seeder_count = -1;
int leecher_count = -1;
int download_count = -1;
int downloader_count = -1;
int consecutive_failures = 0;
tr_tracker_id_t const id;
};
// format: `${host}:${port}`
tr_interned_string tr_announcerGetKey(tr_url_parsed_t const& parsed)
{
std::string buf;
tr_buildBuf(buf, parsed.host, ":"sv, parsed.portstr);
return tr_interned_string{ buf };
}
/***
****
***/
/** @brief A group of trackers in a single tier, as per the multitracker spec */
struct tr_tier
{
tr_tier(tr_announcer* announcer, tr_torrent* tor_in, std::vector<tr_announce_list::tracker_info const*> const& infos)
: tor{ tor_in }
, id{ next_key++ }
{
trackers.reserve(std::size(infos));
for (auto const* info : infos)
{
trackers.emplace_back(announcer, *info);
}
useNextTracker();
}
[[nodiscard]] tr_tracker* currentTracker()
{
if (!current_tracker_index_)
{
return nullptr;
}
TR_ASSERT(*current_tracker_index_ < std::size(trackers));
return &trackers[*current_tracker_index_];
}
[[nodiscard]] tr_tracker const* currentTracker() const
{
if (!current_tracker_index_)
{
return nullptr;
}
TR_ASSERT(*current_tracker_index_ < std::size(trackers));
return &trackers[*current_tracker_index_];
}
[[nodiscard]] bool needsToAnnounce(time_t now) const
{
return !isAnnouncing && !isScraping && announceAt != 0 && announceAt <= now && !std::empty(announce_events);
}
[[nodiscard]] bool needsToScrape(time_t now) const
{
auto const* const tracker = currentTracker();
return !isScraping && scrapeAt != 0 && scrapeAt <= now && tracker != nullptr && tracker->scrape_info != nullptr;
}
[[nodiscard]] auto countDownloaders() const
{
auto const* const tracker = currentTracker();
return tracker == nullptr ? 0 : tracker->downloader_count + tracker->leecher_count;
}
tr_tracker* useNextTracker()
{
// move our index to the next tracker in the tier
if (std::empty(trackers))
{
current_tracker_index_ = std::nullopt;
}
else if (!current_tracker_index_)
{
current_tracker_index_ = 0;
}
else
{
current_tracker_index_ = (*current_tracker_index_ + 1) % std::size(trackers);
}
// reset some of the tier's fields
scrapeIntervalSec = DefaultScrapeIntervalSec;
announceIntervalSec = DefaultAnnounceIntervalSec;
announceMinIntervalSec = DefaultAnnounceMinIntervalSec;
isAnnouncing = false;
isScraping = false;
lastAnnounceStartTime = 0;
lastScrapeStartTime = 0;
return currentTracker();
}
[[nodiscard]] std::optional<size_t> indexOf(tr_interned_string const& announce_url) const
{
for (size_t i = 0, n = std::size(trackers); i < n; ++i)
{
if (announce_url == trackers[i].announce_url)
{
return i;
}
}
return std::nullopt;
}
void buildLogName(char* buf, size_t buflen) const
{
auto const* const torrent_name = tr_torrentName(tor);
auto const* const current_tracker = currentTracker();
auto const host_sv = current_tracker == nullptr ? "?"sv : current_tracker->host.sv();
tr_snprintf(buf, buflen, "[%s---%" TR_PRIsv "]", torrent_name, TR_PRIsv_ARG(host_sv));
}
[[nodiscard]] bool canManualAnnounce() const
{
return this->manualAnnounceAllowedAt <= tr_time();
}
tr_torrent* const tor;
/* number of up/down/corrupt bytes since the last time we sent an
* "event=stopped" message that was acknowledged by the tracker */
std::array<uint64_t, 3> byteCounts = {};
std::vector<tr_tracker> trackers;
std::optional<size_t> current_tracker_index_;
time_t scrapeAt = 0;
time_t lastScrapeStartTime = 0;
time_t lastScrapeTime = 0;
bool lastScrapeSucceeded = false;
bool lastScrapeTimedOut = false;
time_t announceAt = 0;
time_t manualAnnounceAllowedAt = 0;
time_t lastAnnounceStartTime = 0;
time_t lastAnnounceTime = 0;
bool lastAnnounceSucceeded = false;
bool lastAnnounceTimedOut = false;
std::deque<tr_announce_event> announce_events;
int announce_event_priority = 0;
int const id;
int scrapeIntervalSec = DefaultScrapeIntervalSec;
int announceIntervalSec = DefaultAnnounceIntervalSec;
int announceMinIntervalSec = DefaultAnnounceMinIntervalSec;
int lastAnnouncePeerCount = 0;
bool isRunning = false;
bool isAnnouncing = false;
bool isScraping = false;
std::string last_announce_str;
std::string last_scrape_str;
private:
static int next_key;
};
int tr_tier::next_key = 0;
static time_t get_next_scrape_time(tr_session const* session, tr_tier const* tier, int interval)
{
/* Maybe don't scrape paused torrents */
if (!tier->isRunning && !session->scrapePausedTorrents)
{
return 0;
}
/* Add the interval, and then increment to the nearest 10th second.
* The latter step is to increase the odds of several torrents coming
* due at the same time to improve multiscrape. */
time_t const now = tr_time();
time_t ret = now + interval;
while (ret % 10 != 0)
{
++ret;
}
return ret;
}
/***
****
***/
/**
* @brief Opaque, per-torrent data structure for tracker announce information
*
* this opaque data structure can be found in tr_torrent.tiers
*/
struct tr_torrent_announcer
{
tr_torrent_announcer(tr_announcer* announcer, tr_torrent* tor)
{
// build the trackers
auto tier_to_infos = std::map<tr_tracker_tier_t, std::vector<tr_announce_list::tracker_info const*>>{};
auto const& announce_list = tor->announceList();
for (auto const& info : announce_list)
{
tier_to_infos[info.tier].emplace_back(&info);
}
for (auto const& tt : tier_to_infos)
{
tiers.emplace_back(announcer, tor, tt.second);
}
}
tr_tier* getTier(int tier_id)
{
for (auto& tier : tiers)
{
if (tier.id == tier_id)
{
return &tier;
}
}
return nullptr;
}
tr_tier* getTierFromScrape(tr_interned_string const& scrape_url)
{
for (auto& tier : tiers)
{
auto const* const tracker = tier.currentTracker();
if (tracker != nullptr && tracker->scrape_info != nullptr && tracker->scrape_info->scrape_url == scrape_url)
{
return &tier;
}
}
return nullptr;
}
[[nodiscard]] bool canManualAnnounce() const
{
return std::any_of(std::begin(tiers), std::end(tiers), [](auto const& tier) { return tier.canManualAnnounce(); });
}
[[nodiscard]] bool findTracker(
tr_interned_string const& announce_url,
tr_tier const** setme_tier,
tr_tracker const** setme_tracker) const
{
for (auto const& tier : tiers)
{
for (auto const& tracker : tier.trackers)
{
if (tracker.announce_url == announce_url)
{
*setme_tier = &tier;
*setme_tracker = &tracker;
return true;
}
}
}
return false;
}
std::vector<tr_tier> tiers;
tr_tracker_callback callback = nullptr;
void* callback_data = nullptr;
};
static tr_tier* getTier(tr_announcer* announcer, tr_sha1_digest_t const& info_hash, int tier_id)
{
if (announcer == nullptr)
{
return nullptr;
}
auto* const tor = announcer->session->getTorrent(info_hash);
if (tor == nullptr || tor->torrent_announcer == nullptr)
{
return nullptr;
}
return tor->torrent_announcer->getTier(tier_id);
}
/***
**** PUBLISH
***/
static void publishMessage(tr_tier* tier, std::string_view msg, TrackerEventType type)
{
if (tier != nullptr && tier->tor != nullptr && tier->tor->torrent_announcer != nullptr &&
tier->tor->torrent_announcer->callback != nullptr)
{
auto* const ta = tier->tor->torrent_announcer;
auto event = tr_tracker_event{};
event.messageType = type;
event.text = msg;
if (auto const* const current_tracker = tier->currentTracker(); current_tracker != nullptr)
{
event.announce_url = current_tracker->announce_url;
}
(*ta->callback)(tier->tor, &event, ta->callback_data);
}
}
static void publishErrorClear(tr_tier* tier)
{
publishMessage(tier, ""sv, TR_TRACKER_ERROR_CLEAR);
}
static void publishWarning(tr_tier* tier, std::string_view msg)
{
publishMessage(tier, msg, TR_TRACKER_WARNING);
}
static void publishError(tr_tier* tier, std::string_view msg)
{
publishMessage(tier, msg, TR_TRACKER_ERROR);
}
static void publishPeerCounts(tr_tier* tier, int seeders, int leechers)
{
if (tier->tor->torrent_announcer->callback != nullptr)
{
auto e = tr_tracker_event{};
e.messageType = TR_TRACKER_COUNTS;
e.seeders = seeders;
e.leechers = leechers;
dbgmsg(tier, "peer counts: %d seeders, %d leechers.", seeders, leechers);
(*tier->tor->torrent_announcer->callback)(tier->tor, &e, nullptr);
}
}
static void publishPeersPex(tr_tier* tier, int seeders, int leechers, std::vector<tr_pex> const& pex)
{
if (tier->tor->torrent_announcer->callback != nullptr)
{
auto e = tr_tracker_event{};
e.messageType = TR_TRACKER_PEERS;
e.seeders = seeders;
e.leechers = leechers;
e.pex = pex;
dbgmsg(
tier,
"tracker knows of %d seeders and %d leechers and gave a list of %zu peers.",
seeders,
leechers,
std::size(pex));
(*tier->tor->torrent_announcer->callback)(tier->tor, &e, nullptr);
}
}
/***
****
***/
tr_torrent_announcer* tr_announcerAddTorrent(tr_torrent* tor, tr_tracker_callback callback, void* callback_data)
{
TR_ASSERT(tr_isTorrent(tor));
auto* ta = new tr_torrent_announcer(tor->session->announcer, tor);
ta->callback = callback;
ta->callback_data = callback_data;
return ta;
}
/***
****
***/
bool tr_announcerCanManualAnnounce(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tor->torrent_announcer != nullptr);
return tor->isRunning && tor->torrent_announcer->canManualAnnounce();
}
time_t tr_announcerNextManualAnnounce(tr_torrent const* tor)
{
time_t ret = ~(time_t)0;
for (auto const& tier : tor->torrent_announcer->tiers)
{
if (tier.isRunning)
{
ret = std::min(ret, tier.manualAnnounceAllowedAt);
}
}
return ret;
}
static void dbgmsg_tier_announce_queue(tr_tier const* tier)
{
if (tr_logGetDeepEnabled())
{
auto name = std::array<char, 128>{};
tier->buildLogName(std::data(name), std::size(name));
auto* const buf = evbuffer_new();
for (size_t i = 0, n = std::size(tier->announce_events); i < n; ++i)
{
tr_announce_event const e = tier->announce_events[i];
char const* str = tr_announce_event_get_string(e);
evbuffer_add_printf(buf, "[%zu:%s]", i, str);
}
auto const message = evbuffer_free_to_str(buf);
tr_logAddDeep(__FILE__, __LINE__, std::data(name), "announce queue is %" TR_PRIsv, TR_PRIsv_ARG(message));
}
}
// higher priorities go to the front of the announce queue
static void tier_update_announce_priority(tr_tier* tier)
{
int priority = -1;
for (auto const& event : tier->announce_events)
{
priority = std::max(priority, int{ event });
}
tier->announce_event_priority = priority;
}
static void tier_announce_remove_trailing(tr_tier* tier, tr_announce_event e)
{
while (!std::empty(tier->announce_events) && tier->announce_events.back() == e)
{
tier->announce_events.resize(std::size(tier->announce_events) - 1);
}
tier_update_announce_priority(tier);
}
static void tier_announce_event_push(tr_tier* tier, tr_announce_event e, time_t announceAt)
{
TR_ASSERT(tier != nullptr);
dbgmsg_tier_announce_queue(tier);
dbgmsg(tier, "queued \"%s\"", tr_announce_event_get_string(e));
auto& events = tier->announce_events;
if (!std::empty(events))
{
/* special case #1: if we're adding a "stopped" event,
* dump everything leading up to it except "completed" */
if (e == TR_ANNOUNCE_EVENT_STOPPED)
{
bool has_completed = std::count(std::begin(events), std::end(events), TR_ANNOUNCE_EVENT_COMPLETED);
events.clear();
if (has_completed)
{
events.push_back(TR_ANNOUNCE_EVENT_COMPLETED);
}
}
/* special case #2: dump all empty strings leading up to this event */
tier_announce_remove_trailing(tier, TR_ANNOUNCE_EVENT_NONE);
/* special case #3: no consecutive duplicates */
tier_announce_remove_trailing(tier, e);
}
/* add it */
events.push_back(e);
tier->announceAt = announceAt;
tier_update_announce_priority(tier);
dbgmsg_tier_announce_queue(tier);
dbgmsg(tier, "announcing in %d seconds", (int)difftime(announceAt, tr_time()));
}
static auto tier_announce_event_pull(tr_tier* tier)
{
auto const e = tier->announce_events.front();
tier->announce_events.pop_front();
tier_update_announce_priority(tier);
return e;
}
static void torrentAddAnnounce(tr_torrent* tor, tr_announce_event e, time_t announceAt)
{
// tell each tier to announce
for (auto& tier : tor->torrent_announcer->tiers)
{
tier_announce_event_push(&tier, e, announceAt);
}
}
void tr_announcerTorrentStarted(tr_torrent* tor)
{
torrentAddAnnounce(tor, TR_ANNOUNCE_EVENT_STARTED, tr_time());
}
void tr_announcerManualAnnounce(tr_torrent* tor)
{
torrentAddAnnounce(tor, TR_ANNOUNCE_EVENT_NONE, tr_time());
}
void tr_announcerTorrentStopped(tr_torrent* tor)
{
torrentAddAnnounce(tor, TR_ANNOUNCE_EVENT_STOPPED, tr_time());
}
void tr_announcerTorrentCompleted(tr_torrent* tor)
{
torrentAddAnnounce(tor, TR_ANNOUNCE_EVENT_COMPLETED, tr_time());
}
void tr_announcerChangeMyPort(tr_torrent* tor)
{
tr_announcerTorrentStarted(tor);
}
/***
****
***/
void tr_announcerAddBytes(tr_torrent* tor, int type, uint32_t byteCount)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(type == TR_ANN_UP || type == TR_ANN_DOWN || type == TR_ANN_CORRUPT);
for (auto& tier : tor->torrent_announcer->tiers)
{
tier.byteCounts[type] += byteCount;
}
}
/***
****
***/
static tr_announce_request* announce_request_new(
tr_announcer const* announcer,
tr_torrent* tor,
tr_tier const* tier,
tr_announce_event event)
{
auto* const req = new tr_announce_request();
req->port = tr_sessionGetPublicPeerPort(announcer->session);
req->announce_url = tier->currentTracker()->announce_url;
req->tracker_id = tier->currentTracker()->tracker_id;
req->info_hash = tor->infoHash();
req->peer_id = tr_torrentGetPeerId(tor);
req->up = tier->byteCounts[TR_ANN_UP];
req->down = tier->byteCounts[TR_ANN_DOWN];
req->corrupt = tier->byteCounts[TR_ANN_CORRUPT];
req->leftUntilComplete = tor->hasMetadata() ? tor->totalSize() - tor->hasTotal() : INT64_MAX;
req->event = event;
req->numwant = event == TR_ANNOUNCE_EVENT_STOPPED ? 0 : Numwant;
req->key = announcer->key;
req->partial_seed = tor->isPartialSeed();
tier->buildLogName(req->log_name, sizeof(req->log_name));
return req;
}
void tr_announcerRemoveTorrent(tr_announcer* announcer, tr_torrent* tor)
{
auto* const ta = tor->torrent_announcer;
if (ta == nullptr)
{
return;
}
for (auto const& tier : ta->tiers)
{
if (tier.isRunning)
{
auto const e = TR_ANNOUNCE_EVENT_STOPPED;
auto* req = announce_request_new(announcer, tor, &tier, e);
if (announcer->stops.count(req))
{
delete req;
}
else
{
announcer->stops.insert(req);
}
}
}
tor->torrent_announcer = nullptr;
delete ta;
}
struct announce_data
{
int const tier_id;
time_t const time_sent;
tr_announce_event event = {};
tr_session* session = nullptr;
/** If the request succeeds, the value for tier's "isRunning" flag */
bool is_running_on_success = false;
};
static void on_announce_error(tr_tier* tier, char const* err, tr_announce_event e)
{
/* increment the error count */
auto* current_tracker = tier->currentTracker();
if (current_tracker != nullptr)
{
++current_tracker->consecutive_failures;
}
/* set the error message */
tier->last_announce_str = err;
/* switch to the next tracker */
current_tracker = tier->useNextTracker();
/* schedule a reannounce */
int const interval = current_tracker->getRetryInterval();
auto const* const host_cstr = current_tracker->host.c_str();
dbgmsg(tier, "Tracker '%s' announce error: %s (Retrying in %d seconds)", host_cstr, err, interval);
tr_logAddTorInfo(tier->tor, "Tracker '%s' announce error: %s (Retrying in %d seconds)", host_cstr, err, interval);
tier_announce_event_push(tier, e, tr_time() + interval);
}
static void on_announce_done(tr_announce_response const* response, void* vdata)
{
auto* const data = static_cast<announce_data*>(vdata);
tr_announcer* announcer = data->session->announcer;
tr_tier* tier = getTier(announcer, response->info_hash, data->tier_id);
time_t const now = tr_time();
tr_announce_event const event = data->event;
if (tier != nullptr)
{
dbgmsg(
tier,
"Got announce response: "
"connected:%d "
"timeout:%d "
"seeders:%d "
"leechers:%d "
"downloads:%d "
"interval:%d "
"min_interval:%d "
"tracker_id_str:%s "
"pex:%zu "
"pex6:%zu "
"err:%s "
"warn:%s",
(int)response->did_connect,
(int)response->did_timeout,
response->seeders,
response->leechers,
response->downloads,
response->interval,
response->min_interval,
(!std::empty(response->tracker_id) ? response->tracker_id.c_str() : "none"),
std::size(response->pex),
std::size(response->pex6),
(!std::empty(response->errmsg) ? response->errmsg.c_str() : "none"),
(!std::empty(response->warning) ? response->warning.c_str() : "none"));
tier->lastAnnounceTime = now;
tier->lastAnnounceTimedOut = response->did_timeout;
tier->lastAnnounceSucceeded = false;
tier->isAnnouncing = false;
tier->manualAnnounceAllowedAt = now + tier->announceMinIntervalSec;
if (!response->did_connect)
{
on_announce_error(tier, _("Could not connect to tracker"), event);
}
else if (response->did_timeout)
{
on_announce_error(tier, _("Tracker did not respond"), event);
}
else if (!std::empty(response->errmsg))
{
/* If the torrent's only tracker returned an error, publish it.
Don't bother publishing if there are other trackers -- it's
all too common for people to load up dozens of dead trackers
in a torrent's metainfo... */
if (tier->tor->trackerCount() < 2)
{
publishError(tier, response->errmsg);
}
on_announce_error(tier, response->errmsg.c_str(), event);
}
else
{
auto const isStopped = event == TR_ANNOUNCE_EVENT_STOPPED;
auto leechers = int{};
auto scrape_fields = int{};
auto seeders = int{};
publishErrorClear(tier);
tr_tracker* const tracker = tier->currentTracker();
if (tracker != nullptr)
{
tracker->consecutive_failures = 0;
if (response->seeders >= 0)
{
tracker->seeder_count = seeders = response->seeders;
++scrape_fields;
}
if (response->leechers >= 0)
{
tracker->leecher_count = leechers = response->leechers;
++scrape_fields;
}
if (response->downloads >= 0)
{
tracker->download_count = response->downloads;
++scrape_fields;
}
if (!std::empty(response->tracker_id))
{
tracker->tracker_id = response->tracker_id;
}
}
if (auto const& warning = response->warning; !std::empty(warning))
{
tier->last_announce_str = warning;
dbgmsg(tier, "tracker gave \"%s\"", warning.c_str());
publishWarning(tier, warning);
}
else
{
tier->last_announce_str = _("Success");
}
if (response->min_interval != 0)
{
tier->announceMinIntervalSec = response->min_interval;
}
if (response->interval != 0)
{
tier->announceIntervalSec = response->interval;
}
if (!std::empty(response->pex))
{
publishPeersPex(tier, seeders, leechers, response->pex);
}
if (!std::empty(response->pex6))
{
publishPeersPex(tier, seeders, leechers, response->pex6);
}
publishPeerCounts(tier, seeders, leechers);
tier->isRunning = data->is_running_on_success;
/* if the tracker included scrape fields in its announce response,
then a separate scrape isn't needed */
if (scrape_fields >= 3 || (scrape_fields >= 1 && tracker->scrape_info == nullptr))
{
tr_logAddTorDbg(
tier->tor,
"Announce response contained scrape info; "
"rescheduling next scrape to %d seconds from now.",
tier->scrapeIntervalSec);
tier->scrapeAt = get_next_scrape_time(announcer->session, tier, tier->scrapeIntervalSec);
tier->lastScrapeTime = now;
tier->lastScrapeSucceeded = true;
}
else if (tier->lastScrapeTime + tier->scrapeIntervalSec <= now)
{
tier->scrapeAt = get_next_scrape_time(announcer->session, tier, 0);
}
tier->lastAnnounceSucceeded = true;
tier->lastAnnouncePeerCount = std::size(response->pex) + std::size(response->pex6);
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;
}
if (!isStopped && std::empty(tier->announce_events))
{
/* the queue is empty, so enqueue a perodic update */
int const i = tier->announceIntervalSec;
dbgmsg(tier, "Sending periodic reannounce in %d seconds", i);
tier_announce_event_push(tier, TR_ANNOUNCE_EVENT_NONE, now + i);
}
}
}
delete data;
}
static void announce_request_delegate(
tr_announcer* announcer,
tr_announce_request* request,
tr_announce_response_func callback,
announce_data* callback_data)
{
tr_session* session = announcer->session;
#if 0
fprintf(stderr, "ANNOUNCE: event %s isPartialSeed %d port %d key %d numwant %d up %" PRIu64 " down %" PRIu64
" corrupt %" PRIu64 " left %" PRIu64 " url [%s] tracker_id_str [%s] peer_id [%20.20s]\n",
tr_announce_event_get_string(request->event), (int)request->partial_seed, (int)request->port, request->key,
request->numwant, request->up, request->down, request->corrupt, request->leftUntilComplete, request->url,
request->tracker_id_str, request->peer_id);
#endif
if (auto const announce_sv = request->announce_url.sv();
tr_strvStartsWith(announce_sv, "http://"sv) || tr_strvStartsWith(announce_sv, "https://"sv))
{
tr_tracker_http_announce(session, request, callback, callback_data);
}
else if (tr_strvStartsWith(announce_sv, "udp://"sv))
{
tr_tracker_udp_announce(session, request, callback, callback_data);
}
else
{
tr_logAddError("Unsupported url: %" TR_PRIsv, TR_PRIsv_ARG(announce_sv));
delete callback_data;
}
delete request;
}
static void tierAnnounce(tr_announcer* announcer, tr_tier* tier)
{
TR_ASSERT(!tier->isAnnouncing);
TR_ASSERT(!std::empty(tier->announce_events));
time_t const now = tr_time();
tr_torrent* tor = tier->tor;
tr_announce_event announce_event = tier_announce_event_pull(tier);
tr_announce_request* req = announce_request_new(announcer, tor, tier, announce_event);
auto* const data = new announce_data{ tier->id, now, announce_event, announcer->session, tor->isRunning };
tier->isAnnouncing = true;
tier->lastAnnounceStartTime = now;
announce_request_delegate(announcer, req, on_announce_done, data);
}
/***
****
**** SCRAPE
****
***/
static bool multiscrape_too_big(std::string_view errmsg)
{
/* Found a tracker that returns some bespoke string for this case?
Add your patch here and open a PR */
auto constexpr TooLongErrors = std::array<std::string_view, 3>{
"Bad Request",
"GET string too long",
"Request-URI Too Long",
};
return std::any_of(
std::begin(TooLongErrors),
std::end(TooLongErrors),
[&errmsg](auto const& substr) { return tr_strvContains(errmsg, substr); });
}
static void on_scrape_error(tr_session const* session, tr_tier* tier, char const* errmsg)
{
// increment the error count
auto* current_tracker = tier->currentTracker();
if (current_tracker != nullptr)
{
++current_tracker->consecutive_failures;
}
// set the error message
tier->last_scrape_str = errmsg != nullptr ? errmsg : "";
// switch to the next tracker
current_tracker = tier->useNextTracker();
// schedule a rescrape
auto const interval = current_tracker->getRetryInterval();
auto const* const host_cstr = current_tracker->host.c_str();
dbgmsg(tier, "Tracker '%s' scrape error: %s (Retrying in %zu seconds)", host_cstr, errmsg, (size_t)interval);
tr_logAddTorInfo(tier->tor, "Tracker '%s' error: %s (Retrying in %zu seconds)", host_cstr, errmsg, (size_t)interval);
tier->lastScrapeSucceeded = false;
tier->scrapeAt = get_next_scrape_time(session, tier, interval);
}
static void checkMultiscrapeMax(tr_announcer* announcer, tr_scrape_response const* response)
{
if (!multiscrape_too_big(response->errmsg))
{
return;
}
auto const& url = response->scrape_url;
auto* const scrape_info = tr_announcerGetScrapeInfo(announcer, url);
if (scrape_info == nullptr)
{
return;
}
// Lower the max only if it hasn't already lowered for a similar
// error. So if N parallel multiscrapes all have the same `max`
// and error out, lower the value once for that batch, not N times.
int& multiscrape_max = scrape_info->multiscrape_max;
if (multiscrape_max < response->row_count)
{
return;
}
int const n = std::max(1, int{ multiscrape_max - TrMultiscrapeStep });
if (multiscrape_max != n)
{
// don't log the full URL, since that might have a personal announce id
// (note: we know 'parsed' will be successful since this url has a scrape_info)
auto const parsed = *tr_urlParse(url.sv());
auto clean_url = std::string{};
tr_buildBuf(clean_url, parsed.scheme, "://"sv, parsed.host, ":"sv, parsed.portstr);
tr_logAddNamedInfo(clean_url.c_str(), "Reducing multiscrape max to %d", n);
multiscrape_max = n;
}
}
static void on_scrape_done(tr_scrape_response const* response, void* vsession)
{
auto const now = tr_time();
auto* const session = static_cast<tr_session*>(vsession);
auto* const announcer = session->announcer;
for (int i = 0; i < response->row_count; ++i)
{
auto const& row = response->rows[i];
auto* const tor = session->getTorrent(row.info_hash);
if (tor != nullptr)
{
auto* tier = tor->torrent_announcer->getTierFromScrape(response->scrape_url);
if (tier == nullptr)
{
continue;
}
auto const scrape_url_sv = response->scrape_url.sv();
dbgmsg(
tier,
"scraped url:%" TR_PRIsv
" -- "
"did_connect:%d "
"did_timeout:%d "
"seeders:%d "
"leechers:%d "
"downloads:%d "
"downloaders:%d "
"min_request_interval:%d "
"err:%s ",
TR_PRIsv_ARG(scrape_url_sv),
(int)response->did_connect,
(int)response->did_timeout,
row.seeders,
row.leechers,
row.downloads,
row.downloaders,
response->min_request_interval,
std::empty(response->errmsg) ? "none" : response->errmsg.c_str());
tier->isScraping = false;
tier->lastScrapeTime = now;
tier->lastScrapeSucceeded = false;
tier->lastScrapeTimedOut = response->did_timeout;
if (!response->did_connect)
{
on_scrape_error(session, tier, _("Could not connect to tracker"));
}
else if (response->did_timeout)
{
on_scrape_error(session, tier, _("Tracker did not respond"));
}
else if (!std::empty(response->errmsg))
{
on_scrape_error(session, tier, response->errmsg.c_str());
}
else
{
tier->lastScrapeSucceeded = true;
tier->scrapeIntervalSec = std::max(int{ DefaultScrapeIntervalSec }, response->min_request_interval);
tier->scrapeAt = get_next_scrape_time(session, tier, tier->scrapeIntervalSec);
tr_logAddTorDbg(tier->tor, "Scrape successful. Rescraping in %d seconds.", tier->scrapeIntervalSec);
tr_tracker* const tracker = tier->currentTracker();
if (tracker != nullptr)
{
if (row.seeders >= 0)
{
tracker->seeder_count = row.seeders;
}
if (row.leechers >= 0)
{
tracker->leecher_count = row.leechers;
}
if (row.downloads >= 0)
{
tracker->download_count = row.downloads;
}
tracker->downloader_count = row.downloaders;
tracker->consecutive_failures = 0;
}
if (row.seeders >= 0 && row.leechers >= 0 && row.downloads >= 0)
{
publishPeerCounts(tier, row.seeders, row.leechers);
}
}
}
}
checkMultiscrapeMax(announcer, response);
}
static void scrape_request_delegate(
tr_announcer* announcer,
tr_scrape_request const* request,
tr_scrape_response_func callback,
void* callback_data)
{
tr_session* session = announcer->session;
auto const scrape_sv = request->scrape_url.sv();
if (tr_strvStartsWith(scrape_sv, "http://"sv) || tr_strvStartsWith(scrape_sv, "https://"sv))
{
tr_tracker_http_scrape(session, request, callback, callback_data);
}
else if (tr_strvStartsWith(scrape_sv, "udp://"sv))
{
tr_tracker_udp_scrape(session, request, callback, callback_data);
}
else
{
tr_logAddError("Unsupported url: %" TR_PRIsv, TR_PRIsv_ARG(scrape_sv));
}
}
static void multiscrape(tr_announcer* announcer, std::vector<tr_tier*> const& tiers)
{
auto const now = tr_time();
auto requests = std::array<tr_scrape_request, MaxScrapesPerUpkeep>{};
auto request_count = size_t{};
// batch as many info_hashes into a request as we can
for (auto* tier : tiers)
{
auto* const scrape_info = tier->currentTracker()->scrape_info;
bool found = false;
TR_ASSERT(scrape_info != nullptr);
/* if there's a request with this scrape URL and a free slot, use it */
for (size_t j = 0; !found && j < request_count; ++j)
{
auto* const req = &requests[j];
if (req->info_hash_count >= scrape_info->multiscrape_max)
{
continue;
}
if (scrape_info->scrape_url != req->scrape_url)
{
continue;
}
req->info_hash[req->info_hash_count] = tier->tor->infoHash();
++req->info_hash_count;
tier->isScraping = true;
tier->lastScrapeStartTime = now;
found = true;
}
/* otherwise, if there's room for another request, build a new one */
if (!found && request_count < MaxScrapesPerUpkeep)
{
auto* const req = &requests[request_count];
req->scrape_url = scrape_info->scrape_url;
tier->buildLogName(req->log_name, sizeof(req->log_name));
req->info_hash[req->info_hash_count] = tier->tor->infoHash();
++req->info_hash_count;
tier->isScraping = true;
tier->lastScrapeStartTime = now;
++request_count;
}
}
/* send the requests we just built */
for (size_t i = 0; i < request_count; ++i)
{
scrape_request_delegate(announcer, &requests[i], on_scrape_done, announcer->session);
}
}
static void flushCloseMessages(tr_announcer* announcer)
{
auto& stops = announcer->stops;
std::for_each(
std::begin(stops),
std::end(stops),
[&announcer](auto* stop) { announce_request_delegate(announcer, stop, nullptr, nullptr); });
stops.clear();
}
static int compareAnnounceTiers(tr_tier const* a, tr_tier const* b)
{
/* prefer higher-priority events */
if (auto const priority_a = a->announce_event_priority, priority_b = b->announce_event_priority; priority_a != priority_b)
{
return priority_a > priority_b ? -1 : 1;
}
/* prefer swarms where we might upload */
if (auto const leechers_a = a->countDownloaders(), leechers_b = b->countDownloaders(); leechers_a != leechers_b)
{
return leechers_a > leechers_b ? -1 : 1;
}
/* prefer swarms where we might download */
if (auto const is_done_a = a->tor->isDone(), is_done_b = b->tor->isDone(); is_done_a != is_done_b)
{
return is_done_a ? 1 : -1;
}
/* prefer larger stats, to help ensure stats get recorded when stopping on shutdown */
if (auto const xa = a->byteCounts[TR_ANN_UP] + a->byteCounts[TR_ANN_DOWN],
xb = b->byteCounts[TR_ANN_UP] + b->byteCounts[TR_ANN_DOWN];
xa != xb)
{
return xa > xb ? -1 : 1;
}
// announcements that have been waiting longer go first
if (a->announceAt != b->announceAt)
{
return a->announceAt < b->announceAt ? -1 : 1;
}
// the tiers are effectively equal priority, but add an arbitrary
// differentiation because ptrArray sorted mode hates equal items.
return a < b ? -1 : 1;
}
static void scrapeAndAnnounceMore(tr_announcer* announcer)
{
time_t const now = tr_time();
/* build a list of tiers that need to be announced */
auto announce_me = std::vector<tr_tier*>{};
auto scrape_me = std::vector<tr_tier*>{};
for (auto* tor : announcer->session->torrents)
{
for (auto& tier : tor->torrent_announcer->tiers)
{
if (tier.needsToAnnounce(now))
{
announce_me.push_back(&tier);
}
if (tier.needsToScrape(now))
{
scrape_me.push_back(&tier);
}
}
}
/* First, scrape what we can. We handle scrapes first because
* we can work through that queue much faster than announces
* (thanks to multiscrape) _and_ the scrape responses will tell
* us which swarms are interesting and should be announced next. */
multiscrape(announcer, scrape_me);
/* Second, announce what we can. If there aren't enough slots
* available, use compareAnnounceTiers to prioritize. */
if (announce_me.size() > MaxAnnouncesPerUpkeep)
{
std::partial_sort(
std::begin(announce_me),
std::begin(announce_me) + MaxAnnouncesPerUpkeep,
std::end(announce_me),
[](auto const* a, auto const* b) { return compareAnnounceTiers(a, b) < 0; });
announce_me.resize(MaxAnnouncesPerUpkeep);
}
for (auto*& tier : announce_me)
{
tr_logAddTorDbg(tier->tor, "%s", "Announcing to tracker");
tierAnnounce(announcer, tier);
}
}
static void onUpkeepTimer(evutil_socket_t /*fd*/, short /*what*/, void* vannouncer)
{
auto* announcer = static_cast<tr_announcer*>(vannouncer);
tr_session* session = announcer->session;
auto const lock = session->unique_lock();
bool const is_closing = session->isClosed;
time_t const now = tr_time();
/* maybe send out some "stopped" messages for closed torrents */
flushCloseMessages(announcer);
/* maybe kick off some scrapes / announces whose time has come */
if (!is_closing)
{
scrapeAndAnnounceMore(announcer);
}
/* TAU upkeep */
if (announcer->tau_upkeep_at <= now)
{
announcer->tau_upkeep_at = now + TauUpkeepIntervalSecs;
tr_tracker_udp_upkeep(session);
}
// set up the next timer
announcer->scheduleNextUpdate();
}
/***
****
***/
static tr_tracker_view trackerView(tr_torrent const& tor, int tier_index, tr_tier const& tier, tr_tracker const& tracker)
{
auto const now = tr_time();
auto view = tr_tracker_view{};
view.host = tracker.host.c_str();
view.announce = tracker.announce_url.c_str();
view.scrape = tracker.scrape_info == nullptr ? "" : tracker.scrape_info->scrape_url.c_str();
view.id = tracker.id;
view.tier = tier_index;
view.isBackup = &tracker != tier.currentTracker();
view.lastScrapeStartTime = tier.lastScrapeStartTime;
view.seederCount = tracker.seeder_count;
view.leecherCount = tracker.leecher_count;
view.downloadCount = tracker.download_count;
if (view.isBackup)
{
view.scrapeState = TR_TRACKER_INACTIVE;
view.announceState = TR_TRACKER_INACTIVE;
view.nextScrapeTime = 0;
view.nextAnnounceTime = 0;
}
else
{
view.hasScraped = tier.lastScrapeTime;
if (view.hasScraped != 0)
{
view.lastScrapeTime = tier.lastScrapeTime;
view.lastScrapeSucceeded = tier.lastScrapeSucceeded;
view.lastScrapeTimedOut = tier.lastScrapeTimedOut;
tr_strlcpy(view.lastScrapeResult, tier.last_scrape_str.c_str(), sizeof(view.lastScrapeResult));
}
if (tier.isScraping)
{
view.scrapeState = TR_TRACKER_ACTIVE;
}
else if (tier.scrapeAt == 0)
{
view.scrapeState = TR_TRACKER_INACTIVE;
}
else if (tier.scrapeAt > now)
{
view.scrapeState = TR_TRACKER_WAITING;
view.nextScrapeTime = tier.scrapeAt;
}
else
{
view.scrapeState = TR_TRACKER_QUEUED;
}
view.lastAnnounceStartTime = tier.lastAnnounceStartTime;
view.hasAnnounced = tier.lastAnnounceTime;
if (view.hasAnnounced != 0)
{
view.lastAnnounceTime = tier.lastAnnounceTime;
view.lastAnnounceSucceeded = tier.lastAnnounceSucceeded;
view.lastAnnounceTimedOut = tier.lastAnnounceTimedOut;
view.lastAnnouncePeerCount = tier.lastAnnouncePeerCount;
tr_strlcpy(view.lastAnnounceResult, tier.last_announce_str.c_str(), sizeof(view.lastAnnounceResult));
}
if (tier.isAnnouncing)
{
view.announceState = TR_TRACKER_ACTIVE;
}
else if (!tor.isRunning || tier.announceAt == 0)
{
view.announceState = TR_TRACKER_INACTIVE;
}
else if (tier.announceAt > now)
{
view.announceState = TR_TRACKER_WAITING;
view.nextAnnounceTime = tier.announceAt;
}
else
{
view.announceState = TR_TRACKER_QUEUED;
}
}
TR_ASSERT(0 <= view.tier);
return view;
}
size_t tr_announcerTrackerCount(tr_torrent const* tor)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tor->torrent_announcer != nullptr);
auto const& tiers = tor->torrent_announcer->tiers;
return std::accumulate(
std::begin(tiers),
std::end(tiers),
size_t{},
[](size_t acc, auto const& cur) { return acc + std::size(cur.trackers); });
}
tr_tracker_view tr_announcerTracker(tr_torrent const* tor, size_t nth)
{
TR_ASSERT(tr_isTorrent(tor));
TR_ASSERT(tor->torrent_announcer != nullptr);
auto i = size_t{ 0 };
for (auto const& tier : tor->torrent_announcer->tiers)
{
for (auto const& tracker : tier.trackers)
{
if (i == nth)
{
return trackerView(*tor, i, tier, tracker);
}
++i;
}
}
TR_ASSERT(false);
return {};
}
/***
****
***/
// called after the torrent's announceList was rebuilt --
// so announcer needs to update the tr_tier / tr_trackers to match
void tr_announcerResetTorrent(tr_announcer* /*announcer*/, tr_torrent* tor)
{
// make a new tr_announcer_tier
auto* const older = tor->torrent_announcer;
tor->torrent_announcer = new tr_torrent_announcer(tor->session->announcer, tor);
auto* const newer = tor->torrent_announcer;
// copy the tracker counts into the new replacementa
if (older != nullptr)
{
for (auto& new_tier : newer->tiers)
{
for (auto& new_tracker : new_tier.trackers)
{
tr_tier const* old_tier = nullptr;
tr_tracker const* old_tracker = nullptr;
if (older->findTracker(new_tracker.announce_url, &old_tier, &old_tracker))
{
new_tracker.seeder_count = old_tracker->seeder_count;
new_tracker.leecher_count = old_tracker->leecher_count;
new_tracker.download_count = old_tracker->download_count;
new_tracker.downloader_count = old_tracker->downloader_count;
new_tier.announce_events = old_tier->announce_events;
new_tier.announce_event_priority = old_tier->announce_event_priority;
auto const* const old_current = old_tier->currentTracker();
new_tier.current_tracker_index_ = old_current == nullptr ? std::nullopt :
new_tier.indexOf(old_current->announce_url);
}
}
}
}
// kickstart any tiers that didn't get started
if (tor->isRunning)
{
auto const now = tr_time();
for (auto& tier : newer->tiers)
{
if (!tier.current_tracker_index_)
{
tier_announce_event_push(&tier, TR_ANNOUNCE_EVENT_STARTED, now);
}
}
}
delete older;
}
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