forked from Ylianst/MeshCentral
-
Notifications
You must be signed in to change notification settings - Fork 0
/
meshscanner.js
171 lines (160 loc) · 9.13 KB
/
meshscanner.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/**
* @description Meshcentral Mesh Agent Local Scanner
* @author Ylian Saint-Hilaire
* @version v0.0.1
*/
// Construct a Mesh Scanner object
// TODO: We need once "server4" and "server6" per interface, or change the default multicast interface as we send.
module.exports.CreateMeshScanner = function (parent) {
var obj = {};
obj.parent = parent;
obj.dgram = require('dgram');
obj.common = require('./common.js');
obj.servers4 = {};
obj.servers6 = {};
obj.mainTimer = null;
var periodicScanTime = (60000 * 20); // Interval between scans, 20 minutes.
var membershipIPv4 = '239.255.255.235';
var membershipIPv6 = 'FF02:0:0:0:0:0:0:FE';
obj.agentCertificatHashHex = parent.certificateOperations.forge.pki.getPublicKeyFingerprint(parent.certificateOperations.forge.pki.certificateFromPem(parent.certificates.agent.cert).publicKey, { md: parent.certificateOperations.forge.md.sha256.create(), encoding: 'hex' });
obj.error = 0;
// Get a list of IPv4 and IPv6 interface addresses
function getInterfaceList() {
var ipv4 = [];
var ipv6 = [];
var interfaces = require('os').networkInterfaces();
for (var i in interfaces) {
var interface = interfaces[i];
for (var j in interface) {
var interface2 = interface[j];
if ((interface2.mac != '00:00:00:00:00:00') && (interface2.internal == false)) {
if (interface2.family == 'IPv4') { ipv4.push(interface2.address); }
if (interface2.family == 'IPv6') { ipv6.push(interface2.address + '%' + i); }
}
}
}
return { ipv4: ipv4, ipv6: ipv6 };
}
// Setup all IPv4 and IPv6 servers
function setupServers() {
var addresses = getInterfaceList();
for (var i in obj.servers4) { obj.servers4[i].xxclear = true; }
for (var i in obj.servers6) { obj.servers6[i].xxclear = true; }
for (var i in addresses.ipv4) {
var localAddress = addresses.ipv4[i];
if (obj.servers4[localAddress] != null) {
// Server already exists
obj.servers4[localAddress].xxclear = false;
} else {
// Create a new IPv4 server
var server4 = obj.dgram.createSocket("udp4");
server4.xxclear = false;
server4.xxtype = 4;
server4.xxlocal = localAddress;
server4.on('error', function (err) { console.log("ERROR: Server port " + server4.xxlocal + ":16989 not available, check if server is running twice."); server4.close(); server4 = null; });
server4.bind({ address: server4.xxlocal, port: 16989, exclusive: false }, function () {
try {
server4.setBroadcast(true);
server4.setMulticastTTL(128);
server4.addMembership(membershipIPv4);
server4.on('error', function (error) { console.log('Error: ' + error); });
server4.on('message', function (msg, info) { onUdpPacket(msg, info, server4); });
obj.performScan(server4);
obj.performScan(server4);
} catch (e) { }
});
obj.servers4[localAddress] = server4;
}
}
for (var i in addresses.ipv6) {
var localAddress = addresses.ipv6[i];
if (obj.servers6[localAddress] != null) {
// Server already exists
obj.servers6[localAddress].xxclear = false;
} else {
// Create a new IPv6 server
var server6 = obj.dgram.createSocket("udp6", localAddress);
server6.xxclear = false;
server6.xxtype = 6;
server6.xxlocal = localAddress;
server6.on('error', function (err) { console.log("ERROR: Server port [" + server6.xxlocal + "]:16989 not available, check if server is running twice.");server6.close(); obj.server6 = null; });
server6.bind({ address: server6.xxlocal, port: 16989, exclusive: false }, function () {
try {
server6.setBroadcast(true);
server6.setMulticastTTL(128);
server6.addMembership(membershipIPv6);
server6.on('error', function (error) { console.log('Error: ' + error); });
server6.on('message', function (msg, info) { onUdpPacket(msg, info, server6); });
performScan(server6);
performScan(server6);
} catch (e) { }
});
obj.servers6[localAddress] = server6;
}
}
for (var i in obj.servers4) { if (obj.servers4[i].xxclear == true) { obj.servers4[i].close(); delete obj.servers4[i]; }; }
for (var i in obj.servers6) { if (obj.servers6[i].xxclear == true) { obj.servers6[i].close(); delete obj.servers6[i]; }; }
}
// Clear all IPv4 and IPv6 servers
function clearServers() {
for (var i in obj.servers4) { obj.servers4[i].close(); delete obj.servers4[i]; }
for (var i in obj.servers6) { obj.servers6[i].close(); delete obj.servers6[i]; }
}
// Start scanning for local network Mesh Agents
obj.start = function () {
if (obj.server4 != null) return;
var url = (parent.args.notls ? 'ws' : 'wss') + '://%s:' + parent.args.port + '/agent.ashx';
obj.multicastPacket4 = Buffer.from("MeshCentral2|" + obj.agentCertificatHashHex.toUpperCase() + '|' + url, 'ascii');
url = (parent.args.notls ? 'ws' : 'wss') + '://[%s]:' + parent.args.port + '/agent.ashx';
obj.multicastPacket6 = Buffer.from("MeshCentral2|" + obj.agentCertificatHashHex.toUpperCase() + '|' + url, 'ascii');
setupServers();
obj.mainTimer = setInterval(obj.performScan, periodicScanTime);
return obj;
}
// Stop scanning for local network Mesh Agents
obj.stop = function () {
if (obj.mainTimer != null) { clearInterval(obj.mainTimer); obj.mainTimer = null; }
clearServers();
}
// Look for all Mesh Agents that may be locally reachable, indicating the presense of this server.
obj.performScan = function (server) {
if (server != null) {
if (server.xxtype == 4) { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, membershipIPv4); }
if (server.xxtype == 6) { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, 16990, membershipIPv6); }
} else {
for (var i in obj.servers4) { obj.servers4[i].send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, membershipIPv4); }
for (var i in obj.servers6) { obj.servers6[i].send(obj.multicastPacket6, 0, obj.multicastPacket6.length, 16990, membershipIPv6); }
setupServers(); // Check if any network interfaces where added or removed
}
}
// Called when a UDP packet is received from an agent.
function onUdpPacket(msg, info, server) {
// console.log('Received ' + msg.length + ' bytes from ' + info.address + ':' + info.port + ', on interface: ' + server.xxlocal + '.');
if ((msg.length == 64) && (msg.toString('ascii') == obj.agentCertificatHashHex.toUpperCase())) {
if (server.xxtype == 4) { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, info.port, info.address); }
if (server.xxtype == 6) { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, info.port, info.address); }
}
}
// As a side job, we also send server wake-on-lan packets
obj.wakeOnLan = function (macs) {
for (var i in macs) {
var mac = macs[i];
var hexpacket = 'FFFFFFFFFFFF';
for (var i = 0; i < 16; i++) { hexpacket += mac; }
var wakepacket = Buffer.from(hexpacket, 'hex');
//console.log(wakepacket.toString('hex'));
// Send the wake packet 3 times with small time intervals
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); }
for (var i in obj.servers6) { obj.servers6[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
setTimeout(function () {
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); }
for (var i in obj.servers6) { obj.servers6[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
}, 200);
setTimeout(function () {
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); }
for (var i in obj.servers6) { obj.servers6[i].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
}, 500);
}
}
return obj;
}