自建 DNS Server (Node.js)

const dns = require("native-dns");
const axios = require("axios")
const https = require("https")
const net = require("net");
const URL = require ("url");

function resolveARecord(hostname, dnsServer) {
    return new Promise(function (resolve, reject) {
        var question = dns.Question({
            name: hostname,
            type: "A"
        });
        var request = dns.Request({
            question: question,
            server: { address: dnsServer, port: 53, type: "udp" },
            timeout: 2000
        });
        request.on("timeout", function () {
            reject(new Error("Timeout in making request"));
        });
        request.on("message", function (err, response) {
            // Resolve using the first populated A record
            for (var i in response.answer) {
                if (response.answer[i].address) {
                    resolve(response.answer[i]);
                    break;
                }
            }
        });
        request.on("end", function () {
            reject(new Error("Unable to resolve hostname"));
        });
        request.send();
    });
}

axios.interceptors.request.use(function (config) {
    var url = URL.parse(config.url);

    if (!config.dnsServer || net.isIP(url.hostname)) {
        // Skip
        return config;
    } else {
        return resolveARecord(url.hostname, config.dnsServer).then(function (response) {
            config.headers = config.headers || {};
            config.headers.Host = url.hostname; // put original hostname in Host header

            url.hostname = response.address;
            delete url.host; // clear hostname cache
            config.url = URL.format(url);

            return config;
        });
    }
});

axios.get(`https://hostA.examplewqeeqweqweqwe.org`, { httpsAgent: agent, dnsServer: '127.0.0.1' }).then(({data}) => {
        console.log(data);
}).catch((error) => {
    console.log(error)
})