mirror of
https://github.com/Ylianst/MeshCentral.git
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188 lines
10 KiB
JavaScript
188 lines
10 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
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* @license Apache-2.0
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* @version v0.0.1
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*/
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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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// Get a list of IPv4 and IPv6 interface addresses
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function getInterfaceList() {
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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 (var i in interfaces) {
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var interface = interfaces[i];
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for (var j in interface) {
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var interface2 = interface[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();
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for (var i in obj.servers4) { obj.servers4[i].xxclear = true; }
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for (var i in obj.servers6) { obj.servers6[i].xxclear = true; }
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for (var i in addresses.ipv4) {
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var 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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var 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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this.setBroadcast(true);
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this.setMulticastTTL(128);
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this.addMembership(membershipIPv4);
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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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obj.performScan(this);
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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 (var i in addresses.ipv6) {
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var 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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var 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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this.setBroadcast(true);
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this.setMulticastTTL(128);
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this.addMembership(membershipIPv6);
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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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obj.performScan(this);
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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 (var i in obj.servers4) { if (obj.servers4[i].xxclear == true) { obj.servers4[i].close(); delete obj.servers4[i]; }; }
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for (var 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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for (var i in obj.servers4) { obj.servers4[i].close(); delete obj.servers4[i]; }
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for (var 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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var url = (parent.args.notls ? 'ws' : 'wss') + '://%s:' + parent.args.port + '/agent.ashx';
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obj.multicastPacket4 = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url, 'ascii');
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url = (parent.args.notls ? 'ws' : 'wss') + '://[%s]:' + parent.args.port + '/agent.ashx';
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obj.multicastPacket6 = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url, '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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if (server != null) {
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if (server.xxtype == 4) { try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, membershipIPv4); } catch (e) { } }
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if (server.xxtype == 6) { try { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, 16990, membershipIPv6); } catch (e) { } }
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if ((server.xxtype == 4) && (server.xxlocal == '*')) { try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, '127.0.0.1'); } catch (e) { } try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, '255.255.255.255'); } catch (e) { } }
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if ((server.xxtype == 6) && (server.xxlocal == '*')) { try { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, 16990, '::1'); } catch (e) { } }
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} else {
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for (var i in obj.servers4) { try { obj.servers4[i].send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, membershipIPv4); } catch (e) { } }
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for (var i in obj.servers6) { try { obj.servers6[i].send(obj.multicastPacket6, 0, obj.multicastPacket6.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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//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) { try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, info.port, info.address); } catch (e) { } }
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if (server.xxtype == 6) { try { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, info.port, info.address); } catch (e) { } }
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}
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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) {
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for (var i in macs) {
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var mac = macs[i];
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var hexpacket = 'FFFFFFFFFFFF';
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for (var i = 0; i < 16; i++) { hexpacket += mac; }
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var wakepacket = Buffer.from(hexpacket, 'hex');
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//console.log(wakepacket.toString('hex'));
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// Send the wake packet 3 times with small time intervals
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for (var i in obj.servers4) { obj.servers4[i].send(wakepacket, 0, wakepacket.length, 7, "255.255.255.255"); obj.servers4[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv4); }
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for (var i in obj.servers6) { obj.servers6[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
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setTimeout(function () {
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for (var i in obj.servers4) { obj.servers4[i].send(wakepacket, 0, wakepacket.length, 7, "255.255.255.255"); obj.servers4[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv4); }
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for (var i in obj.servers6) { obj.servers6[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
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}, 200);
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setTimeout(function () {
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for (var i in obj.servers4) { obj.servers4[i].send(wakepacket, 0, wakepacket.length, 7, "255.255.255.255"); obj.servers4[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv4); }
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for (var i in obj.servers6) { obj.servers6[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
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}, 500);
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}
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}
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return obj;
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} |