transmission/libtransmission/announcer-common.h

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// This file Copyright © 2010-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#ifndef LIBTRANSMISSION_ANNOUNCER_MODULE
#error only the libtransmission announcer module should #include this header.
#endif
#include <array>
#include <cstdint> // uint64_t
#include <optional>
#include <string>
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#include <string_view>
#include <vector>
#include "transmission.h"
#include "interned-string.h"
#include "net.h"
#include "peer-mgr.h" // tr_pex
struct tr_url_parsed_t;
/***
**** SCRAPE
***/
/* pick a number small enough for common tracker software:
* - ocelot has no upper bound
* - opentracker has an upper bound of 64
* - udp protocol has an upper bound of 74
* - xbtt has no upper bound
*
* This is only an upper bound: if the tracker complains about
* length, announcer will incrementally lower the batch size.
*/
auto inline constexpr TR_MULTISCRAPE_MAX = 60;
struct tr_scrape_request
{
/* the scrape URL */
tr_interned_string scrape_url;
/* the name to use when deep logging is enabled */
char log_name[128];
/* info hashes of the torrents to scrape */
std::array<tr_sha1_digest_t, TR_MULTISCRAPE_MAX> info_hash;
/* how many hashes to use in the info_hash field */
int info_hash_count = 0;
};
struct tr_scrape_response_row
{
/* the torrent's info_hash */
tr_sha1_digest_t info_hash;
/* how many peers are seeding this torrent */
int seeders = 0;
/* how many peers are downloading this torrent */
int leechers = 0;
/* how many times this torrent has been downloaded */
int downloads = 0;
/* the number of active downloaders in the swarm.
* this is a BEP 21 extension that some trackers won't support.
* http://www.bittorrent.org/beps/bep_0021.html#tracker-scrapes */
int downloaders = 0;
};
struct tr_scrape_response
{
/* whether or not we managed to connect to the tracker */
bool did_connect = false;
/* whether or not the scrape timed out */
bool did_timeout = false;
/* how many info hashes are in the 'rows' field */
int row_count;
/* the individual torrents' scrape results */
std::array<tr_scrape_response_row, TR_MULTISCRAPE_MAX> rows;
/* the raw scrape url */
tr_interned_string scrape_url;
/* human-readable error string on failure, or nullptr */
std::string errmsg;
/* minimum interval (in seconds) allowed between scrapes.
* this is an unofficial extension that some trackers won't support. */
int min_request_interval;
};
using tr_scrape_response_func = void (*)(tr_scrape_response const* response, void* user_data);
void tr_tracker_http_scrape(
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tr_session const* session,
tr_scrape_request const* req,
tr_scrape_response_func response_func,
void* user_data);
void tr_tracker_udp_scrape(
tr_session* session,
tr_scrape_request const* req,
tr_scrape_response_func response_func,
void* user_data);
/***
**** ANNOUNCE
***/
enum tr_announce_event
{
/* Note: the ordering of this enum's values is important to
* announcer.c's tr_tier.announce_event_priority. If changing
* the enum, ensure announcer.c is compatible with the change. */
TR_ANNOUNCE_EVENT_NONE,
TR_ANNOUNCE_EVENT_STARTED,
TR_ANNOUNCE_EVENT_COMPLETED,
TR_ANNOUNCE_EVENT_STOPPED,
};
std::string_view tr_announce_event_get_string(tr_announce_event);
struct tr_announce_request
{
tr_announce_event event = {};
bool partial_seed = false;
/* the port we listen for incoming peers on */
tr_port port;
/* per-session key */
int key = 0;
/* the number of peers we'd like to get back in the response */
int numwant = 0;
/* the number of bytes we uploaded since the last 'started' event */
uint64_t up = 0;
/* the number of good bytes we downloaded since the last 'started' event */
uint64_t down = 0;
/* the number of bad bytes we downloaded since the last 'started' event */
uint64_t corrupt = 0;
/* the total size of the torrent minus the number of bytes completed */
uint64_t leftUntilComplete = 0;
/* the tracker's announce URL */
tr_interned_string announce_url;
/* key generated by and returned from an http tracker.
* see tr_announce_response.tracker_id_str */
std::string tracker_id;
/* the torrent's peer id.
* this changes when a torrent is stopped -> restarted. */
tr_peer_id_t peer_id;
/* the torrent's info_hash */
tr_sha1_digest_t info_hash;
/* the name to use when deep logging is enabled */
char log_name[128];
};
struct tr_announce_response
{
/* the torrent's info hash */
tr_sha1_digest_t info_hash = {};
/* whether or not we managed to connect to the tracker */
bool did_connect = false;
/* whether or not the scrape timed out */
bool did_timeout = false;
/* preferred interval between announces.
* transmission treats this as the interval for periodic announces */
int interval = 0;
/* minimum interval between announces. (optional)
* transmission treats this as the min interval for manual announces */
int min_interval = 0;
/* how many peers are seeding this torrent */
int seeders = -1;
/* how many peers are downloading this torrent */
int leechers = -1;
/* how many times this torrent has been downloaded */
int downloads = -1;
/* IPv4 peers that we acquired from the tracker */
std::vector<tr_pex> pex;
/* IPv6 peers that we acquired from the tracker */
std::vector<tr_pex> pex6;
/* human-readable error string on failure, or nullptr */
std::string errmsg;
/* human-readable warning string or nullptr */
std::string warning;
/* key generated by and returned from an http tracker.
* if this is provided, subsequent http announces must include this. */
std::string tracker_id;
/* tracker extension that returns the client's public IP address.
* https://www.bittorrent.org/beps/bep_0024.html */
std::optional<tr_address> external_ip;
};
using tr_announce_response_func = void (*)(tr_announce_response const* response, void* userdata);
void tr_tracker_http_announce(
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tr_session const* session,
tr_announce_request const* req,
tr_announce_response_func response_func,
void* user_data);
void tr_tracker_udp_announce(
tr_session* session,
tr_announce_request const* req,
tr_announce_response_func response_func,
void* user_data);
void tr_tracker_udp_start_shutdown(tr_session* session);
void tr_announcerParseHttpAnnounceResponse(tr_announce_response& response, std::string_view benc, std::string_view log_name);
void tr_announcerParseHttpScrapeResponse(tr_scrape_response& response, std::string_view benc, std::string_view log_name);
tr_interned_string tr_announcerGetKey(tr_url_parsed_t const& parsed);