AWS route 53 dynamic ip update tool.

homeUpdater.js

var AWS = require('aws-sdk');
AWS.config.loadFromPath('config.json');
var route53 = new AWS.Route53();

var net = require('net');
var os = require('os');
var zone = "YOUR_ZONE_ID";

var domain = "yourdoma.in";

var lastKnownIp = null;
var lastSentIp = null;

var request = require("request");


function checkIp(){
    var repeater = "http://YOUR_IP:YOUR_PORT"; // FOR a simple service that returns the ip of the caller as text.plain
    request(repeater, function(error, response, body) {
        if(error || body == "undefined"){
            lastKnownIp = null;
            console.log("can't get current ip from repeater "+repeater);
        }else{
            lastKnownIp = body;

            if(lastKnownIp != lastSentIp){
                sendNewIp(lastKnownIp);
            }else{
                console.log("ip not changed");
            }
        }

        setTimeout(checkIp,60*1000);
    });
}

function sendNewIp(newIp){
    console.log("sending new ip:"+newIp+"...");

    getCurrentRecord(function(ip_err,ip_data){

        if(ip_err){
            console.log("can't get current record: "+ip_err);
            return;
        }

        route53.changeResourceRecordSets({
            "HostedZoneId":zone,
            "ChangeBatch":{
                "Changes":[

                    {"Action":"DELETE",
                        "ResourceRecordSet":{
                            "Name":domain,
                            "Type":"A",
                            "TTL":300,
                            "ResourceRecords":ip_data
                        }
                    },

                    {"Action":"CREATE",
                        "ResourceRecordSet":{
                            "Name":domain,
                            "Type":"A",
                            "TTL":300,
                            "ResourceRecords":[{"Value":newIp+""}]}
                    }
                ]
            }
        },function(err,data){
            if(!err){
                console.log("sending new ip:"+newIp+" OK");
                //console.log(data);
                lastSentIp = newIp;


            }else{
                console.log("sending new ip:"+newIp+" FAILED");
                console.log("err "+err);
            }
        })

    });
}

function getCurrentRecord(callback){
    route53.listResourceRecordSets({
        "HostedZoneId":zone
    },function(err,data){
        if(err){
            callback(err,null);
        }else{
            var existingIps = null;
            for (var i=0; data.ResourceRecordSets.length; i++){
                var recordSet = data.ResourceRecordSets[i];
                if(recordSet.Type == "A"){
                    existingIps = recordSet.ResourceRecords;
                    break;
                }
            }

            callback(null,existingIps);
        }
    });
}

checkIp();