aboutsummaryrefslogtreecommitdiffhomepage
path: root/server/controllers/tracker.ts
blob: 915981f6754285a1cc4eb3a3a51323b2497cc161 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
import * as bitTorrentTracker from 'bittorrent-tracker'
import * as express from 'express'
import * as http from 'http'
import * as proxyAddr from 'proxy-addr'
import { Server as WebSocketServer } from 'ws'
import { Redis } from '@server/lib/redis'
import { logger } from '../helpers/logger'
import { CONFIG } from '../initializers/config'
import { TRACKER_RATE_LIMITS } from '../initializers/constants'
import { VideoFileModel } from '../models/video/video-file'
import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'

const TrackerServer = bitTorrentTracker.Server

const trackerRouter = express.Router()

let peersIps = {}
let peersIpInfoHash = {}
runPeersChecker()

const trackerServer = new TrackerServer({
  http: false,
  udp: false,
  ws: false,
  filter: async function (infoHash, params, cb) {
    if (CONFIG.TRACKER.ENABLED === false) {
      return cb(new Error('Tracker is disabled on this instance.'))
    }

    let ip: string

    if (params.type === 'ws') {
      ip = params.ip
    } else {
      ip = params.httpReq.ip
    }

    const key = ip + '-' + infoHash

    peersIps[ip] = peersIps[ip] ? peersIps[ip] + 1 : 1
    peersIpInfoHash[key] = peersIpInfoHash[key] ? peersIpInfoHash[key] + 1 : 1

    if (CONFIG.TRACKER.REJECT_TOO_MANY_ANNOUNCES && peersIpInfoHash[key] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP_PER_INFOHASH) {
      return cb(new Error(`Too many requests (${peersIpInfoHash[key]} of ip ${ip} for torrent ${infoHash}`))
    }

    try {
      if (CONFIG.TRACKER.PRIVATE === false) return cb()

      const videoFileExists = await VideoFileModel.doesInfohashExistCached(infoHash)
      if (videoFileExists === true) return cb()

      const playlistExists = await VideoStreamingPlaylistModel.doesInfohashExistCached(infoHash)
      if (playlistExists === true) return cb()

      cb(new Error(`Unknown infoHash ${infoHash} requested by ip ${ip}`))

      // Close socket connection and block IP for a few time
      if (params.type === 'ws') {
        Redis.Instance.setTrackerBlockIP(ip)
          .catch(err => logger.error('Cannot set tracker block ip.', { err }))

        // setTimeout to wait filter response
        setTimeout(() => params.socket.close(), 0)
      }
    } catch (err) {
      logger.error('Error in tracker filter.', { err })
      return cb(err)
    }
  }
})

if (CONFIG.TRACKER.ENABLED !== false) {

  trackerServer.on('error', function (err) {
    logger.error('Error in tracker.', { err })
  })

  trackerServer.on('warning', function (err) {
    logger.warn('Warning in tracker.', { err })
  })
}

const onHttpRequest = trackerServer.onHttpRequest.bind(trackerServer)
trackerRouter.get('/tracker/announce', (req, res) => onHttpRequest(req, res, { action: 'announce' }))
trackerRouter.get('/tracker/scrape', (req, res) => onHttpRequest(req, res, { action: 'scrape' }))

function createWebsocketTrackerServer (app: express.Application) {
  const server = http.createServer(app)
  const wss = new WebSocketServer({ noServer: true })

  wss.on('connection', function (ws, req) {
    ws['ip'] = proxyAddr(req, CONFIG.TRUST_PROXY)

    trackerServer.onWebSocketConnection(ws)
  })

  server.on('upgrade', (request: express.Request, socket, head) => {
    if (request.url === '/tracker/socket') {
      const ip = proxyAddr(request, CONFIG.TRUST_PROXY)

      Redis.Instance.doesTrackerBlockIPExist(ip)
        .then(result => {
          if (result === true) {
            logger.debug('Blocking IP %s from tracker.', ip)

            socket.write('HTTP/1.1 403 Forbidden\r\n\r\n')
            socket.destroy()
            return
          }

          return wss.handleUpgrade(request, socket, head, ws => wss.emit('connection', ws, request))
        })
        .catch(err => logger.error('Cannot check if tracker block ip exists.', { err }))
    }

    // Don't destroy socket, we have Socket.IO too
  })

  return server
}

// ---------------------------------------------------------------------------

export {
  trackerRouter,
  createWebsocketTrackerServer
}

// ---------------------------------------------------------------------------

function runPeersChecker () {
  setInterval(() => {
    logger.debug('Checking peers.')

    for (const ip of Object.keys(peersIpInfoHash)) {
      if (peersIps[ip] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP) {
        logger.warn('Peer %s made abnormal requests (%d).', ip, peersIps[ip])
      }
    }

    peersIpInfoHash = {}
    peersIps = {}
  }, TRACKER_RATE_LIMITS.INTERVAL)
}