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528 529 530 531 532 533 534 535 536 537 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 104x 2x 102x 15x 102x 98x 102x 82x 82x 102x 102x 1x 1x 410x 410x 291x 119x 119x 119x 785x 785x 6x 779x 93x 686x 686x 119x 3x 119x 119x 119x 119x 119x 119x 119x 119x 1x 112x 72x 40x 23x 40x 40x 1x 40x 1x 40x 17x 23x 23x 1x 686x 686x 686x 686x 30x 30x 30x 686x 51x 34x 51x 15x 36x 9x 9x 9x 9x 662x 21x 21x 21x 662x 662x 662x 662x 662x 662x 634x 662x 132x 530x 530x 398x 398x 530x 398x 4x 4x 1x 397x 397x 385x 385x 385x 385x 385x 385x 385x 385x 385x 12x 12x 144x 24x 23x 1x 120x 12x 108x 80x 120x 21x 21x 5x 5x 21x 1x 1x 1x 1x 1x 1x 99x 120x 117x 120x 1x 304x 304x 304x 304x 304x 1x 689x 1x 689x 1x 308x 308x 308x 308x 308x 304x 272x 304x 7x 7x 304x 304x 304x 3x 1x 2x 301x 303x 303x 303x 7x 303x 303x 303x 303x 303x 303x 303x 1x 1x 302x 308x 308x 308x 308x 308x 308x 56x 56x 56x 308x 4x 308x 308x 732x 308x 8x 8x 308x 732x 725x 725x 308x 10x 1x 1x 1x 1x 1x 1x 1x 308x 2x 306x 25x 281x 308x 308x 308x 1x 9x 9x 9x 9x 9x 9x 616x 38x 86x 56x 56x 56x 1x 4x 4x 4x 4x 1x 3x 3x 3x 3x 3x 4x 7x 3x 3x 3x 3x 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. */ var util = require('util') , crypto = require('crypto') , events = require('events') , dgram = require('dgram') , parse = require('coap-packet').parse , generate = require('coap-packet').generate , IncomingMessage = require('./incoming_message') , OutgoingMessage = require('./outgoing_message') , ObserveStream = require('./observe_read_stream') , RetrySend = require('./retry_send') , parseBlock2 = require('./helpers').parseBlock2 , createBlock2 = require('./helpers').createBlock2 , getOption = require('./helpers').getOption , removeOption = require('./helpers').removeOption , maxToken = Math.pow(2, 32) , maxMessageId = Math.pow(2, 16) , pf = require('./polyfill') , hasDNSbug = true , SegmentedTransmission = require("./segmentation").SegmentedTransmission , parseBlockOption = require("./block").parseBlockOption; (function () { var major = parseInt(process.version.match(/^v([^.]+).*$/)[1]) Eif (major >= 4) { hasDNSbug = false } })() function Agent(opts) { if (!(this instanceof Agent)) return new Agent(opts) if (!opts) opts = {} if (!opts.type) opts.type = 'udp4' if (opts.socket) { opts.type = opts.socket.type delete opts.port } this._opts = opts this._init(opts.socket) } util.inherits(Agent, events.EventEmitter) Agent.prototype._init = function initSock(socket) { this._closing = false if (this._sock) { return } var that = this this._sock = socket || dgram.createSocket(this._opts.type) this._sock.on('message', function(msg, rsinfo) { var packet , message , outSocket try { packet = parse(msg) } catch(err) { return } if (packet.code[0] === '0' && packet.code !== '0.00') { // ignore this packet since it's not a response. return } outSocket = that._sock.address() that._handle(msg, rsinfo, outSocket) }) if(this._opts.port) { this._sock.bind( this._opts.port ) } this._sock.on('error', function(err) { // we are skipping DNS errors if(!hasDNSbug || err.code !== 'ENOTFOUND') that.emit('error', err) }) this._msgIdToReq = {} this._tkToReq = {} this._tkToMulticastResAddr = {} this._lastToken = Math.floor(Math.random() * (maxToken - 1)) this._lastMessageId = Math.floor(Math.random() * (maxMessageId - 1)) this._msgInFlight = 0 this._requests = 0 } Agent.prototype._cleanUp = function cleanUp() { if (--this._requests !== 0) return if (!this._opts.socket) this._closing = true Iif (this._msgInFlight !== 0) return this._doClose() } Agent.prototype._doClose = function() { for (var k in this._msgIdToReq) this._msgIdToReq[k].sender.reset() if (this._opts.socket) return this._sock.close() this._sock = null } Agent.prototype._handle = function handle(msg, rsinfo, outSocket) { var packet = parse(msg) , buf , response , that = this , req = this._msgIdToReq[packet.messageId] , ackSent = function(err) { Iif (err && req) req.emit('error', err) that._msgInFlight-- Iif (that._closing && that._msgInFlight === 0) { that._doClose() } } if (!req) { if (packet.token.length > 0) { req = this._tkToReq[packet.token.toString('hex')] } if ((packet.ack || packet.reset) && !req) { // Nothing to do on unknown or duplicate ACK/RST packet return } if (!req) { buf = generate({ code: '0.00' , reset: true , messageId: packet.messageId }) this._msgInFlight++ this._sock.send(buf, 0, buf.length, rsinfo.port, rsinfo.address, ackSent) return } } if (packet.confirmable) { buf = generate({ code: '0.00' , ack: true , messageId: packet.messageId }) this._msgInFlight++ this._sock.send(buf, 0, buf.length, rsinfo.port, rsinfo.address, ackSent) } Iif (packet.code != '0.00' && (req._packet.token.length != packet.token.length || pf.compareBuffers(req._packet.token, packet.token) != 0)) { // The tokens don't match, ignore the message since it is a malformed response return } var block1Buff = getOption(packet.options, 'Block1') var block1 Iif(block1Buff) { block1 = parseBlockOption(block1Buff) // check for error if (!block1) { req.sender.reset() return req.emit('error', new Error('Failed to parse block1')) } } req.sender.reset() Iif(block1 && packet.ack) { // var initialRequest = this._msgIdToReq[packet.messageId]; //If the client takes too long to respond then the retry sender will send // another packet with the previous messageId, which we've already removed. var segmentedSender = req.segmentedSender if(segmentedSender) { //If there's more to send/receive, then carry on! if(segmentedSender.remaining() > 0) { if(segmentedSender.isCorrectACK(packet, block1)) { delete this._msgIdToReq[req._packet.messageId] req._packet.messageId = that._nextMessageId() this._msgIdToReq[req._packet.messageId] = req segmentedSender.receiveACK(packet, block1) } else { segmentedSender.resendPreviousPacket() } return } else { // console.log("Packet received done"); removeOption(req._packet.options, "Block1") delete req.segmentedSender } } } if (!packet.confirmable && !req.multicast) { delete this._msgIdToReq[packet.messageId] } // Drop empty messages (ACKs), but process RST if (packet.code == '0.00' && !packet.reset) { return } var block2Buff = getOption(packet.options, 'Block2') var block2 // if we got blockwise (2) response if (block2Buff) { block2 = parseBlock2(block2Buff) // check for error Iif (!block2) { req.sender.reset() return req.emit('error', new Error('failed to parse block2')) } } if (block2) { if (req.multicast) { req = this._convertMulticastToUnicastRequest(req, rsinfo) if (!req) { return } } // accumulate payload req._totalPayload = Buffer.concat([req._totalPayload, packet.payload]) if (block2.moreBlock2) { // increase message id for next request delete this._msgIdToReq[req._packet.messageId] req._packet.messageId = that._nextMessageId() this._msgIdToReq[req._packet.messageId] = req // next block2 request var block2Val = createBlock2({ moreBlock2: false, num: block2.num+1, size: block2.size }) Iif (!block2Val) { req.sender.reset() return req.emit('error', new Error('failed to create block2')) } req.setOption('Block2', block2Val) req._packet.payload = null req.sender.send(generate(req._packet)) return } else { // get full payload packet.payload = req._totalPayload // clear the payload incase of block2 req._totalPayload = Buffer.alloc(0) } } if (req.response) { if (req.response.append) { // it is an observe request // and we are already streaming return req.response.append(packet) } else { // TODO There is a previous response but is not an ObserveStream ! return } } else if (block2) { delete that._tkToReq[req._packet.token.toString('hex')] } else if (!req.url.observe && !req.multicast) { // it is not, so delete the token delete that._tkToReq[packet.token.toString('hex')] } if (req.url.observe && packet.code !== '4.04') { response = new ObserveStream(packet, rsinfo, outSocket) response.on('close', function() { delete that._tkToReq[packet.token.toString('hex')] that._cleanUp() }) response.on('deregister', function() { var deregister_url = Object.assign({}, req.url) deregister_url.observe = 1 deregister_url.token = req._packet.token let deregister_req = that.request(deregister_url) // If the request fails, we'll deal with it with a RST message anyway. deregister_req.on('error', function() {}) deregister_req.end() }) } else { response = new IncomingMessage(packet, rsinfo, outSocket) } if (!req.multicast) { req.response = response } req.emit('response', response) } Agent.prototype._nextToken = function nextToken() { var buf = Buffer.alloc(8) Iif (++this._lastToken === maxToken) this._lastToken = 0 buf.writeUInt32BE(this._lastToken, 0) crypto.randomBytes(4).copy(buf, 4) return buf } Agent.prototype._nextMessageId = function nextToken() { if (++this._lastMessageId === maxMessageId) this._lastMessageId = 1 return this._lastMessageId } /** * Entry point for a new client-side request. * @param {*} url A String representing a CoAP URL, or an object with the appropriate parameters. */ Agent.prototype.request = function request(url) { this._init() var req , response , options = url.options || url.headers , option , that = this , multicastTimeout = url.multicastTimeout !== undefined ? parseInt(url.multicastTimeout) : 20000 req = new OutgoingMessage({}, function(req, packet) { var buf if (url.confirmable !== false) { packet.confirmable = true } // multicast message should be forced non-confirmable if (url.multicast === true) { req.multicast = true packet.confirmable = false } var token Eif (!(packet.ack || packet.reset)) { packet.messageId = that._nextMessageId() if ((url.token instanceof Buffer) && (url.token.length > 0)) { if (url.token.length > 8) { return req.emit('error', new Error('Token may be no longer than 8 bytes.')) } packet.token = url.token } else { packet.token = that._nextToken() } token = packet.token.toString('hex') that._tkToMulticastResAddr[token] = [] if (req.multicast) { that._tkToMulticastResAddr[token] = [] } } that._msgIdToReq[packet.messageId] = req Eif (token) { that._tkToReq[token] = req } var block1Buff = getOption(packet.options, 'Block1') Iif(block1Buff) { // Setup for a segmented transmission req.segmentedSender = new SegmentedTransmission(block1Buff[0], req, packet) req.segmentedSender.sendNext() } else { try { buf = generate(packet) } catch(err) { req.sender.reset() return req.emit('error', err) } req.sender.send(buf, !packet.confirmable) } }) req.sender = new RetrySend(this._sock, url.port, url.hostname || url.host, url.retrySend) req.url = url req.statusCode = url.method || 'GET' urlPropertyToPacketOption(url, req, 'pathname', 'Uri-Path', '/') urlPropertyToPacketOption(url, req, 'query', 'Uri-Query', '&') if (options) { for (option in options) { Eif (options.hasOwnProperty(option)) { req.setOption(option, options[option]) } } } if (url.proxyUri) { req.setOption('Proxy-Uri', url.proxyUri) } req.sender.on('error', req.emit.bind(req, 'error')) req.sender.on('sending', function() { that._msgInFlight++ }) req.sender.on('timeout', function (err) { req.emit('timeout', err) that.abort(req) }) req.sender.on('sent', function() { if (req.multicast) return that._msgInFlight-- Iif (that._closing && that._msgInFlight === 0) { that._doClose() } }) // Start multicast monitoring timer in case of multicast request if (url.multicast === true) { req.multicastTimer = setTimeout(function() { Eif (req._packet.token) { var token = req._packet.token.toString('hex') delete that._tkToReq[token] delete that._tkToMulticastResAddr[token] } delete that._msgIdToReq[req._packet.messageId] that._msgInFlight-- Iif (that._msgInFlight === 0 && that._closing) { that._doClose() } }, multicastTimeout) } if (typeof (url.observe) === "number") req.setOption('Observe', url.observe) else if (url.observe) req.setOption('Observe', null) else req.on('response', this._cleanUp.bind(this)) this._requests++ req._totalPayload = Buffer.alloc(0) return req } Agent.prototype.abort = function (req) { req.sender.removeAllListeners() req.sender.reset() this._cleanUp() delete this._msgIdToReq[req._packet.messageId] Eif (req._packet.token) { delete this._tkToReq[req._packet.token.toString('hex')] } } function urlPropertyToPacketOption(url, req, property, option, separator) { if (url[property]) req.setOption(option, url[property].normalize('NFC').split(separator) .filter(function(part) { return part !== '' }) .map(function(part) { var buf = Buffer.alloc(Buffer.byteLength(part)) buf.write(part) return buf })) } Agent.prototype._convertMulticastToUnicastRequest = function (req, rsinfo) { var unicastReq = this.request(req.url) var unicastAddress = rsinfo.address.split('%')[0] var token = req._packet.token.toString('hex') if (this._tkToMulticastResAddr[token].includes(unicastAddress)) { return null } unicastReq.url.host = unicastAddress unicastReq.sender._host = unicastAddress clearTimeout(unicastReq.multicastTimer) unicastReq.url.multicast = false req.eventNames().forEach(eventName => { req.listeners(eventName).forEach(listener => { unicastReq.on(eventName, listener) }) }) this._tkToMulticastResAddr[token].push(unicastAddress) unicastReq._packet.token = this._nextToken() this._requests++ return unicastReq } module.exports = Agent |