dns

server.js

var dnsd = require('dnsd')
var http = require('http')
var datx = require('ipip-datx');


var value;

dnsd.createServer(function(req, res) {
    var key = JSON.stringify(req.question).split(",")[0].split(":")[1]
    value = req.connection.remoteAddress.toString()
    //value = req.headers['x-forwarded-for'] ||
        req.connection.remoteAddress ||
        req.socket.remoteAddress ||
        (req.connection.socket ? req.connection.socket.remoteAddress : null);
    console.log(key.substring(1,key.length-1))
    console.log(value)
    res.end('106.14.149.21')
}).listen(53)

http.createServer(function (req, res) {
    setTimeout(function() {
        var ip = req.connection.remoteAddress.toString().split(":")[3]
        var city = new datx.City("mydata4vipday2.datx");
        // findSync 此方法只接受IPv4类型的IP地址，请自行检查参数是否符合规定；
        //console.log(city.findSync("123.121.17.72")[1] + city.findSync("123.121.17.72")[4]);
        res.writeHead(200, {'Content-Type': 'application/json;charset=utf-8',
            "Access-Control-Allow-Origin": "*"});
        res.end(JSON.stringify(
            { "ClientIp": ip,
                "ClientIsp" : city.findSync(ip)[1] + city.findSync(ip)[4],
            "LDNS": value,
            "LDNSIsp" : city.findSync(value)[1] + city.findSync(value)[4]
            }
            ));
    }, 100);
}).listen(8080);

good job

fantastic！

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