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528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 820x 820x 5x 620x 310x 310x 6x 6x 310x 286x 310x 310x 310x 310x 10x 10x 310x 2x 308x 2139x 310x 309x 310x 305x 310x 310x 310x 310x 310x 310x 661x 564x 564x 310x 310x 1x 310x 1x 310x 7x 310x 1x 1x 8x 8x 7x 7x 11x 4x 7x 7x 1x 7x 7x 7x 7x 7x 1x 9x 9x 9x 9x 304x 820x 820x 820x 1692x 820x 1x 1x 1x 1x 1x 8x 8x 11x 2x 1x 1x 305x 305x 2x 305x 1x 1x 305x 290x 290x 305x 1x 1x 1x 304x 1x 304x 301x 304x 7x 7x 297x 297x 297x 297x 297x 1x 1x 1x 2x 297x 290x 304x 304x 304x 304x 3x 304x 304x 304x 1x 209x 83x 209x 203x 209x 198x 194x 198x 198x 198x 11x 209x 209x 209x 1x 811x 34x 777x 777x 777x 777x 777x 777x 777x 2x 775x 69x 1x 69x 706x 9x 697x 24x 24x 3x 694x 694x 694x 694x 661x 661x 661x 661x 626x 35x 35x 1x 661x 661x 661x 661x 660x 1x 694x 694x 694x 694x 694x 694x 694x 694x 642x 642x 411x 642x 232x 642x 238x 404x 404x 394x 394x 394x 300x 300x 300x 1x 694x 642x 52x 1x 1507x 1507x 1420x 1507x 673x 1x 1x 1x 1x 493x 493x 493x 411x 411x 1x 1x 492x 76x 416x 6x 416x 416x 416x 1x 1x 415x 415x 415x 415x 415x 415x 415x 415x 415x 415x 415x 623804x 623804x 623804x 415x 1x | 'use strict' /* * Copyright (c) 2013-2021 node-coap contributors. * * node-coap is licensed under an MIT +no-false-attribs license. * All rights not explicitly granted in the MIT license are reserved. * See the included LICENSE file for more details. */ require('./polyfill') var dgram = require('dgram') , os = require('os') , net = require('net') , util = require('util') , series = require('fastseries') , events = require('events') , LRU = require('lru-cache') , generate = require('coap-packet').generate , IncomingMessage = require('./incoming_message') , OutgoingMessage = require('./outgoing_message') , ObserveStream = require('./observe_write_stream') , parameters = require('./parameters') , RetrySend = require('./retry_send') , parseBlock2 = require('./helpers').parseBlock2 , createBlock2 = require('./helpers').createBlock2 , getOption = require('./helpers').getOption , isNumeric = require('./helpers').isNumeric , isBoolean = require('./helpers').isBoolean , middlewares = require('./middlewares') , debug = require('debug')('CoAP Server') , parseBlockOption = require('./block').parseBlockOption , BlockCache = require('./cache') function handleEnding(err) { var request = this if (err) { request.server._sendError(Buffer.from(err.message), request.rsinfo, request.packet) } } function CoAPServer(options, listener) { if (!(this instanceof CoAPServer)) { return new CoAPServer(options, listener) } if (typeof options === 'function') { listener = options options = null } if (!options) options = {} this._options = options this._proxiedRequests = {} this._middlewares = [ middlewares.parseRequest ] if (options.proxy) { this._middlewares.push(middlewares.proxyRequest) this._middlewares.push(middlewares.handleProxyResponse) } if (typeof options.clientIdentifier === 'function') { this._clientIdentifier = options.clientIdentifier } else { this._clientIdentifier = (request) => { return `${request.rsinfo.address}:${request.rsinfo.port}` } } if (!this._options.piggybackReplyMs || !isNumeric(this._options.piggybackReplyMs)) { this._options.piggybackReplyMs = parameters.piggybackReplyMs } if (!isBoolean(this._options.sendAcksForNonConfirmablePackets)) { this._options.sendAcksForNonConfirmablePackets = parameters.sendAcksForNonConfirmablePackets } this._middlewares.push(middlewares.handleServerRequest) // Multicast settings this._multicastAddress = options.multicastAddress ? options.multicastAddress : null this._multicastInterface = options.multicastInterface ? options.multicastInterface : null // We use an LRU cache for the responses to avoid // DDOS problems. // max packet size is 1280 // 32 MB / 1280 = 26214 // The max lifetime is roughly 200s per packet. // Which gave us 131 packets/second guarantee let max = 32768 * 1024 Iif (typeof options.cacheSize === 'number' && options.cacheSize >= 0) { max = options.cacheSize } this._lru = new LRU({ max , length: function(n) { return n.buffer.byteLength } , maxAge: (parameters.exchangeLifetime * 1000) , dispose: function(key, value) { Eif (value.sender) value.sender.reset() } }) this._series = series() this._block1Cache = new BlockCache(parameters.exchangeLifetime * 1000, () => { return {} }) this._block2Cache = new BlockCache(parameters.exchangeLifetime * 1000, () => { return null }) if (listener) this.on('request', listener) debug('initialized') } util.inherits(CoAPServer, events.EventEmitter) CoAPServer.prototype._sendError = function(payload, rsinfo, packet) { var message = generate({ code: '5.00', payload: payload, messageId: (packet)?packet.messageId:undefined, token: (packet)?packet.token:undefined }) this._sock.send(message, 0, message.length, rsinfo.port) } function removeProxyOptions(packet) { var cleanOptions = [] for (var i = 0; i < packet.options.length; i++) { if (packet.options[i].name.toLowerCase() !== 'proxy-uri' && packet.options[i].name.toLowerCase() !== 'proxy-scheme') { cleanOptions.push(packet.options[i]) } } packet.options = cleanOptions return packet } CoAPServer.prototype._sendProxied = function(packet, proxyUri, callback) { var url = require('url').parse(proxyUri) , host = url.hostname , port = url.port , message = generate(removeProxyOptions(packet)) this._sock.send(message, 0, message.length, port, host, callback) } CoAPServer.prototype._sendReverseProxied = function(packet, rsinfo, callback) { var host = rsinfo.address , port = rsinfo.port , message = generate(packet) this._sock.send(message, 0, message.length, port, host, callback) } function handleRequest(server) { return function (msg, rsinfo) { var request = { raw: msg, rsinfo: rsinfo, server: server } , activeMiddlewares = [] for (var i = 0; i < server._middlewares.length; i++) { activeMiddlewares.push(server._middlewares[i]) } server._series(request, activeMiddlewares, request, handleEnding) } } function allAddresses(type) { var family = 'IPv4' Iif (type === 'udp6') { family = 'IPv6' } var addresses = [] var interfaces = os.networkInterfaces() for (var ifname in interfaces) { Eif (interfaces.hasOwnProperty(ifname)) { interfaces[ifname].forEach(function (a) { if (a.family == family) { addresses.push(a.address) } }) } } return addresses } CoAPServer.prototype.listen = function(port, address, done) { var that = this if (port == undefined) { port = parameters.coapPort } if (typeof port === 'function') { done = port port = parameters.coapPort } if (typeof address === 'function') { done = address address = null } if (this._sock) { Eif (done) done(new Error('Already listening')) else throw new Error('Already listening') return this } if (address && net.isIPv6(address)) this._options.type = 'udp6' if (!this._options.type) this._options.type = 'udp4' if (port instanceof events.EventEmitter) { this._sock = port if (done) setImmediate(done) } else { this._internal_socket = true this._sock = dgram.createSocket({type: this._options.type, reuseAddr : true}) this._sock.bind(port, address || null, function () { try { if (that._multicastAddress) { that._sock.setMulticastLoopback(true) Iif (that._multicastInterface) { that._sock.addMembership(that._multicastAddress, that._multicastInterface) } else { allAddresses(that._options.type).forEach(function(_interface) { that._sock.addMembership(that._multicastAddress, _interface) }) } } } catch (err) { if (done) return done(err) else throw err } if (done) return done() }) } this._sock.on('message', handleRequest(this)) this._sock.on('error', function(error) { that.emit('error', error) }) Eif (parameters.pruneTimerPeriod) { // Start LRU pruning timer this._lru.pruneTimer = setInterval(function () { that._lru.prune() }, parameters.pruneTimerPeriod*1000) Eif (this._lru.pruneTimer.unref) { this._lru.pruneTimer.unref() } } return this } CoAPServer.prototype.close = function(done) { if (done) { setImmediate(done) } if (this._lru.pruneTimer) { clearInterval(this._lru.pruneTimer) } if (this._sock) { if (this._internal_socket) { this._sock.close() } this._lru.reset() this._sock = null this.emit('close') } else { this._lru.reset() } this._block2Cache.reset() this._block1Cache.reset() return this } /** * Entry point for a new datagram from the client. * @param {Packet} packet The packet that was sent from the client. * @param {Object} rsinfo Connection info */ CoAPServer.prototype._handle = function(packet, rsinfo) { if (packet.code[0] !== '0') { // According to RFC7252 Section 4.2 receiving a confirmable messages // that can't be processed, should be rejected by ignoring it AND // sending a reset. In this case confirmable response message would // be silently ignored, which is not exactly as stated in the standard. // However, sending a reset would interfere with a coap client which is // re-using a socket (see pull-request #131). return } var sock = this._sock , lru = this._lru , Message = OutMessage , that = this , request = new IncomingMessage(packet, rsinfo) , cached = lru.peek(this._toKey(request, packet, true)) , response if (cached && !packet.ack && !packet.reset) { return sock.send(cached, 0, cached.length, rsinfo.port, rsinfo.address) } else if (cached && (packet.ack || packet.reset)) { if (cached.response && packet.reset) { cached.response.end() } return lru.del(this._toKey(request, packet, false)) } else if (packet.ack || packet.reset) { return // nothing to do, ignoring silently } if (request.headers['Observe'] === 0) { Message = ObserveStream if (packet.code !== '0.01') // it is not a GET return this._sendError(Buffer.from('Observe can only be present with a GET'), rsinfo) } var cache_key = this._toCacheKey(request, packet) packet.piggybackReplyMs = this._options.piggybackReplyMs var generateResponse = function() { var response = new Message(packet, function(response, packet) { var buf , sender = new RetrySend(sock, rsinfo.port, rsinfo.address) try { buf = generate(packet) } catch(err) { return response.emit('error', err) } if (Message === OutMessage) { sender.on('error', response.emit.bind(response, 'error')) } else { buf.response = response sender.on('error', function() { response.end() }) } var key = that._toKey(request, packet, packet.ack || !packet.confirmable) lru.set(key, buf) buf.sender = sender if (that._options.sendAcksForNonConfirmablePackets || packet.confirmable) { sender.send(buf, packet.ack || packet.reset || packet.confirmable === false) } else { debug('OMIT ACK PACKAGE') } }) response.statusCode = '2.05' response._request = request._packet response._cachekey = cache_key //inject this function so the response can add an entry to the cache response._addCacheEntry = that._block2Cache.add.bind(that._block2Cache) return response } response = generateResponse() request.rsinfo = rsinfo if (packet.token && packet.token.length > 0) { // return cached value only if this request is not the first block request var block2Buff = getOption(packet.options, 'Block2') var requestedBlockOption if (block2Buff) { requestedBlockOption = parseBlock2(block2Buff) } if (!requestedBlockOption) { requestedBlockOption = {num: 0} } if (requestedBlockOption.num < 1) { Iif(this._block2Cache.remove(cache_key)) { debug('first block2 request, removed old entry from cache') } } else { debug('check if packet token is in cache, key:', cache_key) if (this._block2Cache.contains(cache_key)) { debug('found cached payload, key:', cache_key) response.end(this._block2Cache.get(cache_key)) return } } } // else goes here? { var block1Buff = getOption(packet.options, 'Block1') Iif(block1Buff) { var blockState = parseBlockOption(block1Buff) if(blockState) { /** @type {{[k:string]:Buffer}} */ let cachedData = this._block1Cache.getWithDefaultInsert(cache_key) var blockByteSize = Math.pow(2, 4 + blockState.blockSize) var incomingByteIndex = blockState.sequenceNumber * blockByteSize // Store in the cache object, use the byte index as the key cachedData[incomingByteIndex] = request.payload if(!blockState.moreBlocks) { // Last block var byteOffsets = Object.keys(cachedData) .map((str) => { return parseInt(str) }).sort((a, b) => { return a - b }) var byteTotalSum = incomingByteIndex + request.payload.length var next = 0 var concat = Buffer.alloc(byteTotalSum) for(var i = 0; i < byteOffsets.length; i++) { if(byteOffsets[i] == next) { var buff = cachedData[byteOffsets[i]] buff.copy(concat, next, 0, buff.length) next += buff.length } else { throw new Error("Byte offset not the next in line...") } } this._block1Cache.remove(cache_key) if(next == concat.length) { request.payload = concat } else { throw new Error("Last byte index is not equal to the concat buffer length!") } } else { // More blocks to come. ACK this block response.code = "2.31" response.setOption("Block1", block1Buff) response.end() return } } else { throw new Error("Invalid block state" + blockState) } } } this.emit('request', request, response) } CoAPServer.prototype._toCacheKey = function toCacheKey(request, packet) { if (packet.token && packet.token.length > 0) { return `${packet.token.toString('hex')}/${this._clientIdentifier(request)}` } return null } CoAPServer.prototype._toKey = function toKey(request, packet, appendToken) { var result = `${this._clientIdentifier(request)}/${packet.messageId}` if (appendToken) result += packet.token.toString('hex') return result } /* new out message inherit from OutgoingMessage to handle cached answer and blockwise (2) */ function OutMessage() { OutgoingMessage.apply(this, Array.prototype.slice.call(arguments)) } util.inherits(OutMessage, OutgoingMessage) // maxBlock2 is in formular 2**(i+4), and must <= 2**(6+4) var maxBlock2 = Math.pow(2, Math.floor(Math.log(parameters.maxPacketSize)/Math.log(2))) Iif (maxBlock2 > Math.pow(2, (6+4))) maxBlock2 = Math.pow(2, (6+4)) /** * Entry point for a response from the server * @param {Buffer} payload A buffer-like object containing data to send back to the client. */ OutMessage.prototype.end = function(payload) { var that = this // removeOption(this._request.options, 'Block1'); // add logic for Block1 sending var block2Buff = getOption(this._request.options, 'Block2') var requestedBlockOption // if we got blockwise (2) request if (block2Buff) { requestedBlockOption = parseBlock2(block2Buff) // bad option if (!requestedBlockOption) { that.statusCode = '4.02' return OutgoingMessage.prototype.end.call(that) } } // if payload is suitable for ONE message, shoot it out if (!payload || ((!requestedBlockOption) && (payload.length < parameters.maxPacketSize))) return OutgoingMessage.prototype.end.call(this, payload) // for the first request, block2 option may be missed if (!requestedBlockOption) requestedBlockOption = { size: maxBlock2, num: 0 } // block2 size should not bigger than maxBlock2 Iif (requestedBlockOption.size > maxBlock2) requestedBlockOption.size = maxBlock2 // block number should have limit var lastBlockNum = Math.ceil(payload.length/requestedBlockOption.size) - 1 if (requestedBlockOption.num > lastBlockNum) { // precondition fail, may request for out of range block that.statusCode = '4.02' return OutgoingMessage.prototype.end.call(that) } // check if requested block is the last var moreFlag = requestedBlockOption.num < lastBlockNum var block2 = createBlock2({ moreBlock2: moreFlag, num: requestedBlockOption.num, size: requestedBlockOption.size }) Iif (!block2) { // this catch never be match, // since we're gentleman, just handle it that.statusCode = '4.02' return OutgoingMessage.prototype.end.call(that) } this.setOption('Block2', block2) this.setOption('ETag', _toETag(payload)) // cache it Eif (this._request.token && this._request.token.length > 0) { this._addCacheEntry(this._cachekey, payload) } OutgoingMessage.prototype.end.call(this, payload.slice((requestedBlockOption.num)*requestedBlockOption.size, (requestedBlockOption.num+1)*requestedBlockOption.size)) } /* calculate id of a payload by xor each 2-byte-block from it use to generate etag payload an input buffer, represent payload need to generate id (hash) id return var, is a buffer(2) */ function _toETag(payload) { var id = Buffer.of(0, 0) var i = 0 do { id[0] ^= payload[i] id[1] ^= payload[i+1] i += 2 } while (i<payload.length) return id } module.exports = CoAPServer |