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9b67da3d C |
1 | import { logger } from '../helpers/logger' |
2 | import * as express from 'express' | |
3 | import * as http from 'http' | |
4 | import * as bitTorrentTracker from 'bittorrent-tracker' | |
5 | import * as proxyAddr from 'proxy-addr' | |
6 | import { Server as WebSocketServer } from 'ws' | |
7 | import { CONFIG, TRACKER_RATE_LIMITS } from '../initializers/constants' | |
8 | ||
9 | const TrackerServer = bitTorrentTracker.Server | |
10 | ||
11 | const trackerRouter = express.Router() | |
12 | ||
13 | let peersIps = {} | |
14 | let peersIpInfoHash = {} | |
15 | runPeersChecker() | |
16 | ||
17 | const trackerServer = new TrackerServer({ | |
18 | http: false, | |
19 | udp: false, | |
20 | ws: false, | |
21 | dht: false, | |
22 | filter: function (infoHash, params, cb) { | |
23 | let ip: string | |
24 | ||
25 | if (params.type === 'ws') { | |
26 | ip = params.socket.ip | |
27 | } else { | |
28 | ip = params.httpReq.ip | |
29 | } | |
30 | ||
31 | const key = ip + '-' + infoHash | |
32 | ||
33 | peersIps[ip] = peersIps[ip] ? peersIps[ip] + 1 : 1 | |
34 | peersIpInfoHash[key] = peersIpInfoHash[key] ? peersIpInfoHash[key] + 1 : 1 | |
35 | ||
36 | if (peersIpInfoHash[key] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP_PER_INFOHASH) { | |
37 | return cb(new Error(`Too many requests (${peersIpInfoHash[ key ]} of ip ${ip} for torrent ${infoHash}`)) | |
38 | } | |
39 | ||
40 | return cb() | |
41 | } | |
42 | }) | |
43 | ||
44 | trackerServer.on('error', function (err) { | |
45 | logger.error('Error in tracker.', { err }) | |
46 | }) | |
47 | ||
48 | trackerServer.on('warning', function (err) { | |
49 | logger.warn('Warning in tracker.', { err }) | |
50 | }) | |
51 | ||
52 | const onHttpRequest = trackerServer.onHttpRequest.bind(trackerServer) | |
53 | trackerRouter.get('/tracker/announce', (req, res) => onHttpRequest(req, res, { action: 'announce' })) | |
54 | trackerRouter.get('/tracker/scrape', (req, res) => onHttpRequest(req, res, { action: 'scrape' })) | |
55 | ||
56 | function createWebsocketServer (app: express.Application) { | |
57 | const server = http.createServer(app) | |
58 | const wss = new WebSocketServer({ server: server, path: '/tracker/socket' }) | |
59 | wss.on('connection', function (ws, req) { | |
60 | const ip = proxyAddr(req, CONFIG.TRUST_PROXY) | |
61 | ws['ip'] = ip | |
62 | ||
63 | trackerServer.onWebSocketConnection(ws) | |
64 | }) | |
65 | ||
66 | return server | |
67 | } | |
68 | ||
69 | // --------------------------------------------------------------------------- | |
70 | ||
71 | export { | |
72 | trackerRouter, | |
73 | createWebsocketServer | |
74 | } | |
75 | ||
76 | // --------------------------------------------------------------------------- | |
77 | ||
78 | function runPeersChecker () { | |
79 | setInterval(() => { | |
80 | logger.debug('Checking peers.') | |
81 | ||
82 | for (const ip of Object.keys(peersIpInfoHash)) { | |
83 | if (peersIps[ip] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP) { | |
84 | logger.warn('Peer %s made abnormal requests (%d).', ip, peersIps[ip]) | |
85 | } | |
86 | } | |
87 | ||
88 | peersIpInfoHash = {} | |
89 | peersIps = {} | |
90 | }, TRACKER_RATE_LIMITS.INTERVAL) | |
91 | } |