267 lines
14 KiB
JavaScript
267 lines
14 KiB
JavaScript
/**
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* @description MeshCentral Mesh Agent Local Scanner
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* @author Ylian Saint-Hilaire
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* @copyright Intel Corporation 2018-2022
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* @license Apache-2.0
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* @version v0.0.1
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*/
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/*jslint node: true */
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/*jshint node: true */
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/*jshint strict:false */
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/*jshint -W097 */
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/*jshint esversion: 6 */
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"use strict";
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// Construct a Mesh Scanner object
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// TODO: We need once "server4" and "server6" per interface, or change the default multicast interface as we send.
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module.exports.CreateMeshScanner = function (parent) {
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var obj = {};
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obj.parent = parent;
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obj.dgram = require('dgram');
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obj.common = require('./common.js');
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obj.servers4 = {};
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obj.servers6 = {};
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obj.mainTimer = null;
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const periodicScanTime = (60000 * 20); // Interval between scans, 20 minutes.
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const membershipIPv4 = '239.255.255.235';
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const membershipIPv6 = 'FF02:0:0:0:0:0:0:FE';
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obj.agentCertificateHashHex = parent.certificateOperations.forge.pki.getPublicKeyFingerprint(parent.certificateOperations.forge.pki.certificateFromPem(parent.certificates.agent.cert).publicKey, { md: parent.certificateOperations.forge.md.sha384.create(), encoding: 'hex' }).toUpperCase();
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obj.error = 0;
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obj.pendingOutboundPackets = [];
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obj.pendingOutboundTimer = null;
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// Setup the multicast key if present
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if ((typeof obj.parent.args.localdiscovery == 'object') && (typeof obj.parent.args.localdiscovery.key == 'string') && (obj.parent.args.localdiscovery.key.length > 0)) {
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obj.multicastKey = parent.crypto.createHash('sha384').update(obj.parent.args.localdiscovery.key).digest('raw').slice(0, 32);
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}
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// Encrypt UDP packet
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function encryptPacket(plainPacket) {
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if (obj.multicastKey == null) { return plainPacket; }
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const iv = parent.crypto.randomBytes(16), aes = parent.crypto.createCipheriv('aes-256-cbc', obj.multicastKey, iv);
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var ciphertext = aes.update(plainPacket);
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return Buffer.concat([iv, ciphertext, aes.final()]);
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}
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// Decrypt UDP packet
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function decryptPacket(packet) {
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if (obj.multicastKey == null) { return packet; }
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if (packet.length < 17) { return null; }
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try {
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const iv = packet.slice(0, 16), data = packet.slice(16);
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const aes = parent.crypto.createDecipheriv('aes-256-cbc', obj.multicastKey, iv);
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var plaintextBytes = Buffer.from(aes.update(data));
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return Buffer.concat([plaintextBytes, aes.final()]);
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} catch (ex) { return null; }
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}
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// Get a list of IPv4 and IPv6 interface addresses
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function getInterfaceList() {
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var i;
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var ipv4 = ['*'], ipv6 = ['*']; // Bind to IN_ADDR_ANY always
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var interfaces = require('os').networkInterfaces();
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for (i in interfaces) {
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var xinterface = interfaces[i];
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for (var j in xinterface) {
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var interface2 = xinterface[j];
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if ((interface2.mac != '00:00:00:00:00:00') && (interface2.internal == false)) {
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if (interface2.family == 'IPv4') { ipv4.push(interface2.address); }
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if (interface2.family == 'IPv6') { ipv6.push(interface2.address + '%' + i); }
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}
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}
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}
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return { ipv4: ipv4, ipv6: ipv6 };
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}
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// Setup all IPv4 and IPv6 servers
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function setupServers() {
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var addresses = getInterfaceList(), i, localAddress, bindOptions;
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for (i in obj.servers4) { obj.servers4[i].xxclear = true; }
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for (i in obj.servers6) { obj.servers6[i].xxclear = true; }
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for (i in addresses.ipv4) {
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localAddress = addresses.ipv4[i];
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if (obj.servers4[localAddress] != null) {
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// Server already exists
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obj.servers4[localAddress].xxclear = false;
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} else {
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// Create a new IPv4 server
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try {
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var server4 = obj.dgram.createSocket({ type: 'udp4', reuseAddr: true });
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server4.xxclear = false;
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server4.xxtype = 4;
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server4.xxlocal = localAddress;
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server4.on('error', function (err) { /*if (this.xxlocal == '*') { console.log("ERROR: Server port 16989 not available, check if server is running twice."); } this.close(); delete obj.servers6[this.xxlocal];*/ });
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bindOptions = { port: 16989, exclusive: true };
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if (server4.xxlocal != '*') { bindOptions.address = server4.xxlocal; }
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server4.bind(bindOptions, function () {
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try {
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var doscan = true;
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try { this.setBroadcast(true); this.setMulticastTTL(128); this.addMembership(membershipIPv4, this.xxlocal); } catch (e) { doscan = false; }
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this.on('error', function (error) { /*console.log('Error: ' + error);*/ });
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this.on('message', function (msg, info) { onUdpPacket(msg, info, this); });
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if (doscan == true) { obj.performScan(this); obj.performScan(this); }
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} catch (e) { console.log(e); }
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});
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obj.servers4[localAddress] = server4;
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} catch (e) {
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console.log(e);
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}
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}
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}
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for (i in addresses.ipv6) {
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localAddress = addresses.ipv6[i];
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if (obj.servers6[localAddress] != null) {
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// Server already exists
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obj.servers6[localAddress].xxclear = false;
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} else {
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// Create a new IPv6 server
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try {
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var server6 = obj.dgram.createSocket({ type: 'udp6', reuseAddr: true });
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server6.xxclear = false;
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server6.xxtype = 6;
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server6.xxlocal = localAddress;
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server6.on('error', function (err) { /*this.close(); delete obj.servers6[this.xxlocal];*/ });
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bindOptions = { port: 16989, exclusive: true };
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if (server6.xxlocal != '*') { bindOptions.address = server6.xxlocal; }
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server6.bind(bindOptions, function () {
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try {
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var doscan = true;
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try { this.setBroadcast(true); this.setMulticastTTL(128); this.addMembership(membershipIPv6, this.xxlocal); } catch (e) { doscan = false; }
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this.on('error', function (error) { console.log('Error: ' + error); });
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this.on('message', function (msg, info) { onUdpPacket(msg, info, this); });
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if (doscan == true) { obj.performScan(this); obj.performScan(this); }
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} catch (e) { console.log(e); }
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});
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obj.servers6[localAddress] = server6;
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} catch (e) {
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console.log(e);
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}
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}
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}
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for (i in obj.servers4) { if (obj.servers4[i].xxclear == true) { obj.servers4[i].close(); delete obj.servers4[i]; } }
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for (i in obj.servers6) { if (obj.servers6[i].xxclear == true) { obj.servers6[i].close(); delete obj.servers6[i]; } }
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}
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// Clear all IPv4 and IPv6 servers
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function clearServers() {
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var i;
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for (i in obj.servers4) { obj.servers4[i].close(); delete obj.servers4[i]; }
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for (i in obj.servers6) { obj.servers6[i].close(); delete obj.servers6[i]; }
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}
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// Start scanning for local network Mesh Agents
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obj.start = function () {
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if (obj.server4 != null) return;
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// Setup the local discovery values
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var name = 'MeshCentral';
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var info = '';
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try {
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if ((typeof obj.parent.config.domains[''].title == 'string') && (obj.parent.config.domains[''].title.length > 0)) {
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name = obj.parent.config.domains[''].title; info = '';
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try { if ((typeof obj.parent.config.domains[''].title2 == 'string') && (obj.parent.config.domains[''].title2.length > 0)) { info = obj.parent.config.domains[''].title2; } } catch (ex) { }
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}
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} catch (ex) { }
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try {
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if ((typeof obj.parent.args.localdiscovery.name == 'string') && (obj.parent.args.localdiscovery.name.length > 0)) {
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name = obj.parent.args.localdiscovery.name; info = '';
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try { if ((typeof obj.parent.args.localdiscovery.info == 'string') && (obj.parent.args.localdiscovery.info.length > 0)) { info = obj.parent.args.localdiscovery.info; } } catch (ex) { }
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}
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} catch (ex) { }
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if (info == '') { info = parent.certificates.CommonName; }
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// Figure out the correct websocket port
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var port = (parent.args.aliasport)?parent.args.aliasport:parent.args.port;
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// Build the IPv4 response
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var url = 'wss://%s:' + port + '/agent.ashx';
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obj.multicastPacket4 = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url, 'ascii');
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if (parent.certificates.CommonName.indexOf('.') != -1) { url = 'wss://' + parent.certificates.CommonName + ':' + port + '/agent.ashx'; }
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obj.multicastPacket4x = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url + '|' + name + '|' + info, 'ascii');
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// Build the IPv6 response
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url = 'wss://[%s]:' + port + '/agent.ashx';
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obj.multicastPacket6 = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url, 'ascii');
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if (parent.certificates.CommonName.indexOf('.') != -1) { url = 'wss://' + parent.certificates.CommonName + ':' + port + '/agent.ashx'; }
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obj.multicastPacket6x = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url + '|' + name + '|' + info, 'ascii');
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setupServers();
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obj.mainTimer = setInterval(obj.performScan, periodicScanTime);
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return obj;
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};
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// Stop scanning for local network Mesh Agents
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obj.stop = function () {
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if (obj.mainTimer != null) { clearInterval(obj.mainTimer); obj.mainTimer = null; }
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clearServers();
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};
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// Look for all Mesh Agents that may be locally reachable, indicating the presense of this server.
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obj.performScan = function (server) {
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var i;
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if (server != null) {
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if (server.xxtype == 4) { var p = encryptPacket(obj.multicastPacket4); try { server.send(p, 0, p.length, 16990, membershipIPv4); } catch (e) { } }
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if (server.xxtype == 6) { var p = encryptPacket(obj.multicastPacket6); try { server.send(p, 0, p.length, 16990, membershipIPv6); } catch (e) { } }
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if ((server.xxtype == 4) && (server.xxlocal == '*')) { var p = encryptPacket(obj.multicastPacket4); try { server.send(p, 0, p.length, 16990, '127.0.0.1'); } catch (e) { } try { server.send(p, 0, p.length, 16990, '255.255.255.255'); } catch (e) { } }
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if ((server.xxtype == 6) && (server.xxlocal == '*')) { var p = encryptPacket(obj.multicastPacket6); try { server.send(p, 0, p.length, 16990, '::1'); } catch (e) { } }
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} else {
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for (i in obj.servers4) { var p = encryptPacket(obj.multicastPacket4); try { obj.servers4[i].send(p, 0, p.length, 16990, membershipIPv4); } catch (e) { } }
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for (i in obj.servers6) { var p = encryptPacket(obj.multicastPacket6); try { obj.servers6[i].send(p, 0, p.length, 16990, membershipIPv6); } catch (e) { } }
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setupServers(); // Check if any network interfaces where added or removed
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}
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};
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// Called when a UDP packet is received from an agent.
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function onUdpPacket(msg, info, server) {
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// Decrypt the packet if needed
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if ((msg = decryptPacket(msg)) == null) return;
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//console.log('Received ' + msg.length + ' bytes from ' + info.address + ':' + info.port + ', on interface: ' + server.xxlocal + '.');
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if ((msg.length == 96) && (msg.toString('ascii') == obj.agentCertificateHashHex)) {
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if (server.xxtype == 4) { var p = encryptPacket(obj.multicastPacket4); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
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if (server.xxtype == 6) { var p = encryptPacket(obj.multicastPacket6); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
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} else if (msg.toString('ascii') == 'MeshServerScan') {
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if (server.xxtype == 4) { var p = encryptPacket(obj.multicastPacket4x); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
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if (server.xxtype == 6) { var p = encryptPacket(obj.multicastPacket6x); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
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}
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}
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// Send the next packet in the pending list, stop the timer if we are done.
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function sendPendingPacket() {
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if (obj.pendingOutboundPackets.length == 0) { if (obj.pendingOutboundTimer != null) { clearInterval(obj.pendingOutboundTimer); obj.pendingOutboundTimer = null; } return; }
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var packet = obj.pendingOutboundPackets.shift();
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if (packet != null) { packet[0].send(packet[1], 0, packet[1].length, packet[2], packet[3]); }
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}
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// As a side job, we also send server wake-on-lan packets
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obj.wakeOnLan = function (macs, host) {
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var i, j, futureTime = 0;
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for (i in macs) {
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var mac = macs[i].split(':').join('');
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var hexpacket = 'FFFFFFFFFFFF';
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for (j = 0; j < 16; j++) { hexpacket += mac; }
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var wakepacket = Buffer.from(hexpacket, 'hex');
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// Add all wake packets to the pending list
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for (var k = 0; k < 5; k++) {
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for (j in obj.servers4) {
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obj.pendingOutboundPackets.push([obj.servers4[j], wakepacket, 7, '255.255.255.255']); // IPv4 Broadcast
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obj.pendingOutboundPackets.push([obj.servers4[j], wakepacket, 16990, membershipIPv4]); // IPv4 Multicast
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if (host != null) { obj.pendingOutboundPackets.push([obj.servers4[j], wakepacket, 7, host]); } // IPv4 Directed
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}
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for (j in obj.servers6) {
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obj.pendingOutboundPackets.push([obj.servers6[j], wakepacket, 16990, membershipIPv6]); // IPv6 Multicast
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}
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}
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// Send each packet at 10ms interval
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// This packet spacing is absolutly required, otherwise the outbound buffer gets filled up and packets get lost which often causes the machine not to wake.
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if (obj.pendingOutboundTimer == null) { obj.pendingOutboundTimer = setInterval(sendPendingPacket, 10); }
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}
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};
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return obj;
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}; |