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 { TRACKER_RATE_LIMITS } from '../initializers/constants'
   8 import { VideoFileModel } from '../models/video/video-file'
   9 import { parse } from 'url'
  10 import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
  11 import { CONFIG } from '../initializers/config'
  12
  13 const TrackerServer = bitTorrentTracker.Server
  14
  15 const trackerRouter = express.Router()
  16
  17 let peersIps = {}
  18 let peersIpInfoHash = {}
  19 runPeersChecker()
  20
  21 const trackerServer = new TrackerServer({
  22   http: false,
  23   udp: false,
  24   ws: false,
  25   dht: false,
  26   filter: async function (infoHash, params, cb) {
  27     if (CONFIG.TRACKER.ENABLED === false) {
  28       return cb(new Error('Tracker is disabled on this instance.'))
  29     }
  30
  31     let ip: string
  32
  33     if (params.type === 'ws') {
  34       ip = params.socket.ip
  35     } else {
  36       ip = params.httpReq.ip
  37     }
  38
  39     const key = ip + '-' + infoHash
  40
  41     peersIps[ ip ] = peersIps[ ip ] ? peersIps[ ip ] + 1 : 1
  42     peersIpInfoHash[ key ] = peersIpInfoHash[ key ] ? peersIpInfoHash[ key ] + 1 : 1
  43
  44     if (CONFIG.TRACKER.REJECT_TOO_MANY_ANNOUNCES && peersIpInfoHash[ key ] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP_PER_INFOHASH) {
  45       return cb(new Error(`Too many requests (${peersIpInfoHash[ key ]} of ip ${ip} for torrent ${infoHash}`))
  46     }
  47
  48     try {
  49       if (CONFIG.TRACKER.PRIVATE === false) return cb()
  50
  51       const videoFileExists = await VideoFileModel.doesInfohashExistCached(infoHash)
  52       if (videoFileExists === true) return cb()
  53
  54       const playlistExists = await VideoStreamingPlaylistModel.doesInfohashExist(infoHash)
  55       if (playlistExists === true) return cb()
  56
  57       return cb(new Error(`Unknown infoHash ${infoHash}`))
  58     } catch (err) {
  59       logger.error('Error in tracker filter.', { err })
  60       return cb(err)
  61     }
  62   }
  63 })
  64
  65 if (CONFIG.TRACKER.ENABLED !== false) {
  66
  67   trackerServer.on('error', function (err) {
  68     logger.error('Error in tracker.', { err })
  69   })
  70
  71   trackerServer.on('warning', function (err) {
  72     logger.warn('Warning in tracker.', { err })
  73   })
  74 }
  75
  76 const onHttpRequest = trackerServer.onHttpRequest.bind(trackerServer)
  77 trackerRouter.get('/tracker/announce', (req, res) => onHttpRequest(req, res, { action: 'announce' }))
  78 trackerRouter.get('/tracker/scrape', (req, res) => onHttpRequest(req, res, { action: 'scrape' }))
  79
  80 function createWebsocketTrackerServer (app: express.Application) {
  81   const server = http.createServer(app)
  82   const wss = new WebSocketServer({ noServer: true })
  83
  84   wss.on('connection', function (ws, req) {
  85     ws['ip'] = proxyAddr(req, CONFIG.TRUST_PROXY)
  86
  87     trackerServer.onWebSocketConnection(ws)
  88   })
  89
  90   server.on('upgrade', (request, socket, head) => {
  91     const pathname = parse(request.url).pathname
  92
  93     if (pathname === '/tracker/socket') {
  94       wss.handleUpgrade(request, socket, head, ws => wss.emit('connection', ws, request))
  95     }
  96
  97     // Don't destroy socket, we have Socket.IO too
  98   })
  99
 100   return server
 101 }
 102
 103 // ---------------------------------------------------------------------------
 104
 105 export {
 106   trackerRouter,
 107   createWebsocketTrackerServer
 108 }
 109
 110 // ---------------------------------------------------------------------------
 111
 112 function runPeersChecker () {
 113   setInterval(() => {
 114     logger.debug('Checking peers.')
 115
 116     for (const ip of Object.keys(peersIpInfoHash)) {
 117       if (peersIps[ip] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP) {
 118         logger.warn('Peer %s made abnormal requests (%d).', ip, peersIps[ip])
 119       }
 120     }
 121
 122     peersIpInfoHash = {}
 123     peersIps = {}
 124   }, TRACKER_RATE_LIMITS.INTERVAL)
 125 }