Get the DNS propagation time

dns-propagation-time-check.js

#!/usr/bin/env node

const dns = require('dns');

const options = {
  ttl: true
};

if (process.argv.length < 4) {
	console.error("Usage dns-propagation-time-check.js domain ip_target");
	return 1;
}

var domain = process.argv[2];
var ip_target = process.argv[3];

var start_time = (new Date).getTime();

function resolveDns(domain, ip_target, callback) {
	dns.resolve4(domain, options, function (err, addresses) {
		var str_addr = [];
		var found = false;

		if (err) {
			console.warn("ERROR: " + JSON.stringify(err));
		}
		else {
			for (var i = 0; i < addresses.length; i++) {
				var addr = addresses[i];
				str_addr.push(addr.address + "(" + addr.ttl + ")");

				if (checkIp(addr.address, ip_target))
					found = true;
			}
			
			console.log('Time: %s, addresses(ttl): %s, family: IPv4', new Date().toISOString(), str_addr.join(", "));
		}

		if (found)
			return callback("",(new Date).getTime());
		else
			setTimeout(resolveDns, 1000, domain, ip_target, callback);
	});
}

function checkIp(ip1, ip2) {
	var ret = false;
	var a = ip1.split(".");
	var b = ip2.split(".");

	if ( (a.length == b.length) && (a.length == 4) && (parseInt(a[0]) == parseInt(b[0])) && (parseInt(a[1]) == parseInt(b[1])) && (parseInt(a[2]) == parseInt(b[2])) && (parseInt(a[3]) == parseInt(b[3])) )
		ret = true;

	return ret;
}

resolveDns(domain, ip_target, function(err, end_time) {
	if (err)
		console.error("ERROR! " + JSON.stringify(err));
	
	console.log("Propagation time: " + (end_time - start_time) / 1000.0)
});