PeerTube/server/core/controllers/tracker.ts

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import { Server as TrackerServer } from 'bittorrent-tracker'
import express from 'express'
import { createServer } from 'http'
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import { LRUCache } from 'lru-cache'
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import proxyAddr from 'proxy-addr'
import { WebSocketServer } from 'ws'
import { logger } from '../helpers/logger.js'
import { CONFIG } from '../initializers/config.js'
import { LRU_CACHE, TRACKER_RATE_LIMITS } from '../initializers/constants.js'
import { VideoFileModel } from '../models/video/video-file.js'
import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist.js'
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const trackerRouter = express.Router()
const blockedIPs = new LRUCache<string, boolean>({
max: LRU_CACHE.TRACKER_IPS.MAX_SIZE,
ttl: TRACKER_RATE_LIMITS.BLOCK_IP_LIFETIME
})
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let peersIps = {}
let peersIpInfoHash = {}
runPeersChecker()
const trackerServer = new TrackerServer({
http: false,
udp: false,
ws: false,
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filter: async function (infoHash, params, cb) {
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if (CONFIG.TRACKER.ENABLED === false) {
return cb(new Error('Tracker is disabled on this instance.'))
}
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let ip: string
if (params.type === 'ws') {
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ip = params.ip
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} else {
ip = params.httpReq.ip
}
const key = ip + '-' + infoHash
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peersIps[ip] = peersIps[ip] ? peersIps[ip] + 1 : 1
peersIpInfoHash[key] = peersIpInfoHash[key] ? peersIpInfoHash[key] + 1 : 1
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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}`))
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}
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try {
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if (CONFIG.TRACKER.PRIVATE === false) return cb()
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const videoFileExists = await VideoFileModel.doesInfohashExistCached(infoHash)
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if (videoFileExists === true) return cb()
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const playlistExists = await VideoStreamingPlaylistModel.doesInfohashExistCached(infoHash)
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if (playlistExists === true) return cb()
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cb(new Error(`Unknown infoHash ${infoHash} requested by ip ${ip}`))
// Close socket connection and block IP for a few time
if (params.type === 'ws') {
blockedIPs.set(ip, true)
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// setTimeout to wait filter response
setTimeout(() => params.socket.close(), 0)
}
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} catch (err) {
logger.error('Error in tracker filter.', { err })
return cb(err)
}
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}
})
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if (CONFIG.TRACKER.ENABLED !== false) {
trackerServer.on('error', function (err) {
logger.error('Error in tracker.', { err })
})
trackerServer.on('warning', function (err) {
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const message = err.message || ''
if (CONFIG.LOG.LOG_TRACKER_UNKNOWN_INFOHASH === false && message.includes('Unknown infoHash')) {
return
}
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logger.warn('Warning in tracker.', { err })
})
}
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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' }))
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function createWebsocketTrackerServer (app: express.Application) {
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const server = createServer(app)
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const wss = new WebSocketServer({ noServer: true })
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wss.on('connection', function (ws, req) {
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ws['ip'] = proxyAddr(req, CONFIG.TRUST_PROXY)
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trackerServer.onWebSocketConnection(ws)
})
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server.on('upgrade', (request: express.Request, socket, head) => {
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if (request.url === '/tracker/socket') {
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const ip = proxyAddr(request, CONFIG.TRUST_PROXY)
if (blockedIPs.has(ip)) {
logger.debug('Blocking IP %s from tracker.', ip)
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socket.write('HTTP/1.1 403 Forbidden\r\n\r\n')
socket.destroy()
return
}
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return wss.handleUpgrade(request, socket, head, ws => wss.emit('connection', ws, request))
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}
// Don't destroy socket, we have Socket.IO too
})
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return { server, trackerServer }
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}
// ---------------------------------------------------------------------------
export {
trackerRouter,
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createWebsocketTrackerServer
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}
// ---------------------------------------------------------------------------
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)
}