server/controllers/tracker.ts

   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 import { VideoFileModel } from '../models/video/video-file'
   9 import { parse } from 'url'
  10
  11 const TrackerServer = bitTorrentTracker.Server
  12
  13 const trackerRouter = express.Router()
  14
  15 let peersIps = {}
  16 let peersIpInfoHash = {}
  17 runPeersChecker()
  18
  19 const trackerServer = new TrackerServer({
  20   http: false,
  21   udp: false,
  22   ws: false,
  23   dht: false,
  24   filter: function (infoHash, params, cb) {
  25     let ip: string
  26
  27     if (params.type === 'ws') {
  28       ip = params.socket.ip
  29     } else {
  30       ip = params.httpReq.ip
  31     }
  32
  33     const key = ip + '-' + infoHash
  34
  35     peersIps[ip] = peersIps[ip] ? peersIps[ip] + 1 : 1
  36     peersIpInfoHash[key] = peersIpInfoHash[key] ? peersIpInfoHash[key] + 1 : 1
  37
  38     if (peersIpInfoHash[key] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP_PER_INFOHASH) {
  39       return cb(new Error(`Too many requests (${peersIpInfoHash[ key ]} of ip ${ip} for torrent ${infoHash}`))
  40     }
  41
  42     VideoFileModel.isInfohashExists(infoHash)
  43       .then(exists => {
  44         if (exists === false) return cb(new Error(`Unknown infoHash ${infoHash}`))
  45
  46         return cb()
  47       })
  48   }
  49 })
  50
  51 trackerServer.on('error', function (err) {
  52   logger.error('Error in tracker.', { err })
  53 })
  54
  55 trackerServer.on('warning', function (err) {
  56   logger.warn('Warning in tracker.', { err })
  57 })
  58
  59 const onHttpRequest = trackerServer.onHttpRequest.bind(trackerServer)
  60 trackerRouter.get('/tracker/announce', (req, res) => onHttpRequest(req, res, { action: 'announce' }))
  61 trackerRouter.get('/tracker/scrape', (req, res) => onHttpRequest(req, res, { action: 'scrape' }))
  62
  63 function createWebsocketTrackerServer (app: express.Application) {
  64   const server = http.createServer(app)
  65   const wss = new WebSocketServer({ noServer: true })
  66
  67   wss.on('connection', function (ws, req) {
  68     ws['ip'] = proxyAddr(req, CONFIG.TRUST_PROXY)
  69
  70     trackerServer.onWebSocketConnection(ws)
  71   })
  72
  73   server.on('upgrade', (request, socket, head) => {
  74     const pathname = parse(request.url).pathname
  75
  76     if (pathname === '/tracker/socket') {
  77       wss.handleUpgrade(request, socket, head, ws => wss.emit('connection', ws, request))
  78     }
  79
  80     // Don't destroy socket, we have Socket.IO too
  81   })
  82
  83   return server
  84 }
  85
  86 // ---------------------------------------------------------------------------
  87
  88 export {
  89   trackerRouter,
  90   createWebsocketTrackerServer
  91 }
  92
  93 // ---------------------------------------------------------------------------
  94
  95 function runPeersChecker () {
  96   setInterval(() => {
  97     logger.debug('Checking peers.')
  98
  99     for (const ip of Object.keys(peersIpInfoHash)) {
 100       if (peersIps[ip] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP) {
 101         logger.warn('Peer %s made abnormal requests (%d).', ip, peersIps[ip])
 102       }
 103     }
 104
 105     peersIpInfoHash = {}
 106     peersIps = {}
 107   }, TRACKER_RATE_LIMITS.INTERVAL)
 108 }