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