-
Notifications
You must be signed in to change notification settings - Fork 12
/
server.js
159 lines (139 loc) · 4.56 KB
/
server.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
var config;
var dgram = require('dgram');
//var bu = require('./lib/BufferUtils');
var packet = require('native-dns-packet');
var server = dgram.createSocket('udp4');
var net = require('net');
var async = require('async');
var HOST;
var PORT;
var DNS;
var fakeIpList;
// var log4js = require("log4js");
// var logger = log4js.getLogger();
exports.startup = function(configFile) {
if(!configFile) {
config = require('./config.json');
} else {
config = configFile;
}
HOST = config.listen.host;
PORT = config.listen.port;
DNS = config.dns;
fakeIpList = config.fakeIpList;
var express = require('express');
var app = express();
app.get('/', function(req, res) {
res.send('Hello World!');
});
var expressServer = app.listen(1933, function() {
var host = expressServer.address().address;
var port = expressServer.address().port;
console.log('Example app listening at http://%s:%s', host, port);
});
server.bind(PORT, HOST);
server.on('listening', function () {
var address = server.address();
console.log('-------------------------------------------');
console.log('DNS Server listening on ' + address.address + ":" + address.port);
console.log('-------------------------------------------');
});
server.on('message', function (message, remote) {
queryDNSs(message, function(data){
server.send(data, 0, data.length, remote.port, remote.address, function (err, bytes) {
});
});
});
};
function getDomain(buffer) {
var question = packet.parse(buffer).question;
return question[0].name;
}
function isFakeIp(ip, list) {
if(ip.length === 0) {
return true;
}
for(var i in list) {
if(ip[0] === list[i]) {
return true;
}
}
return false;
}
function getIpAddress(buffer) {
var ipList = [];
var answer = packet.parse(buffer).answer;
answer.forEach(function(ans){
if(ans.address) {
ipList.push(ans.address);
}
});
return ipList;
}
function queryDNSs(message, cb) {
var dataCallback;
async.detect(DNS, function (item, callback) {
if(item.type == 'UDP' || (!item.type)) {
queryDNSwithUDP(message, item.ip, (item.port ? item.port : 53), function (data) {
dataCallback = data;
callback(data);
});
} else if (item.type == 'TCP') {
queryDNSwithTCP(message, item.ip, (item.port ? item.port : 53), function (data) {
dataCallback = data;
callback(data);
});
}
}, function (results) {
var now = new Date();
console.log(now.toLocaleDateString() + ' ' + now.toLocaleTimeString());
console.log('Res from ' + results.ip + ' ' + (results.type ? results.type : 'UDP'));
console.log(getDomain(dataCallback) + ' ->');
getIpAddress(dataCallback).forEach(function(ip) {
console.log(' ' + ip);
});
console.log('-------------------------------------------');
cb(dataCallback);
});
}
function queryDNSwithUDP(message, address, port, cb) {
var client = dgram.createSocket('udp4');
async.series({
send: function (callback) {
client.send(message, 0, message.length, port, address, function (err, bytes) {
});
callback(null);
},
receive: function (callback) {
client.on("message", function (message, remote) {
if(!isFakeIp(getIpAddress(message), fakeIpList)) {
client.close();
callback(null, message);
}
});
client.on("error", function (err) {
});
}
}, function (err, results) {
cb(results.receive);
}
);
}
function queryDNSwithTCP(message, address, port, cb) {
var client = new net.Socket();
var messageTcp = new Buffer(message.length + 2);
messageTcp[0] = message.length / 256;
messageTcp[1] = message.length % 256;
message.copy(messageTcp, 2, 0, messageTcp.length);
client.connect(port, address, function() {
client.write(messageTcp);
});
client.on('data', function (dataTcp) {
var length = parseInt(dataTcp[1].toString(10) + dataTcp[0].toString(10) * 256, 10);
var data = new Buffer(length);
dataTcp.copy(data, 0, 2, length + 2);
cb(data);
});
client.on('error', function (err) {
});
}