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
  10 const TrackerServer = bitTorrentTracker.Server
  11
  12 const trackerRouter = express.Router()
  13
  14 let peersIps = {}
  15 let peersIpInfoHash = {}
  16 runPeersChecker()
  17
  18 const trackerServer = new TrackerServer({
  19   http: false,
  20   udp: false,
  21   ws: false,
  22   dht: false,
  23   filter: function (infoHash, params, cb) {
  24     let ip: string
  25
  26     if (params.type === 'ws') {
  27       ip = params.socket.ip
  28     } else {
  29       ip = params.httpReq.ip
  30     }
  31
  32     const key = ip + '-' + infoHash
  33
  34     peersIps[ip] = peersIps[ip] ? peersIps[ip] + 1 : 1
  35     peersIpInfoHash[key] = peersIpInfoHash[key] ? peersIpInfoHash[key] + 1 : 1
  36
  37     if (peersIpInfoHash[key] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP_PER_INFOHASH) {
  38       return cb(new Error(`Too many requests (${peersIpInfoHash[ key ]} of ip ${ip} for torrent ${infoHash}`))
  39     }
  40
  41     VideoFileModel.isInfohashExists(infoHash)
  42       .then(exists => {
  43         if (exists === false) return cb(new Error(`Unknown infoHash ${infoHash}`))
  44
  45         return cb()
  46       })
  47   }
  48 })
  49
  50 trackerServer.on('error', function (err) {
  51   logger.error('Error in tracker.', { err })
  52 })
  53
  54 trackerServer.on('warning', function (err) {
  55   logger.warn('Warning in tracker.', { err })
  56 })
  57
  58 const onHttpRequest = trackerServer.onHttpRequest.bind(trackerServer)
  59 trackerRouter.get('/tracker/announce', (req, res) => onHttpRequest(req, res, { action: 'announce' }))
  60 trackerRouter.get('/tracker/scrape', (req, res) => onHttpRequest(req, res, { action: 'scrape' }))
  61
  62 function createWebsocketServer (app: express.Application) {
  63   const server = http.createServer(app)
  64   const wss = new WebSocketServer({ server: server, path: '/tracker/socket' })
  65   wss.on('connection', function (ws, req) {
  66     const ip = proxyAddr(req, CONFIG.TRUST_PROXY)
  67     ws['ip'] = ip
  68
  69     trackerServer.onWebSocketConnection(ws)
  70   })
  71
  72   return server
  73 }
  74
  75 // ---------------------------------------------------------------------------
  76
  77 export {
  78   trackerRouter,
  79   createWebsocketServer
  80 }
  81
  82 // ---------------------------------------------------------------------------
  83
  84 function runPeersChecker () {
  85   setInterval(() => {
  86     logger.debug('Checking peers.')
  87
  88     for (const ip of Object.keys(peersIpInfoHash)) {
  89       if (peersIps[ip] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP) {
  90         logger.warn('Peer %s made abnormal requests (%d).', ip, peersIps[ip])
  91       }
  92     }
  93
  94     peersIpInfoHash = {}
  95     peersIps = {}
  96   }, TRACKER_RATE_LIMITS.INTERVAL)
  97 }