Route53 Dynamic DNS

aws-dynamic-dns

#!/usr/bin/env php
<?php


$template = [
	"Comment"=>"",
	"Changes"=>[
		["Action"=>"#action#",
		"ResourceRecordSet"=>[
			"ResourceRecords"=>[
				["Value"=>"#value#"]
			],
			"Name"=>"#recordset#",
                	"Type"=>"A",
                	"TTL"=>"#ttl#"
		]
		]
	]
];

//to hold id's
$hostedZones = [];
$cnameZones  = [];

$hosts = [
	"johnchardy.com"=>[
		"homelab.johnchardy.com"=>"",
		"homefiles.johnchardy.com"=>"",
		"homeserver.johnchardy.com"=>""
	]
];


//get IP
$ipaddr = trim(`curl -sS https://wtfismyip.com/text`);

//get my hosts zones
$hZones = json_decode(`aws route53 list-hosted-zones --output json`);

foreach($hZones->HostedZones as $k=>$zone) {

	$name = rtrim($zone->Name,".");

	if(array_key_exists($name,$hosts)) {
	
		$hosts[$name]['id'] = $zone->Id;

	}

}

//chop off unlisted zones

foreach($hosts as $k=>$host) {

	if(!array_key_exists("id",$host)) {

		unset($hosts[$k]);	

	}

}

//determine resource actions

foreach($hosts as $k=>$host) {

	$res = json_decode(`aws route53 list-resource-record-sets --hosted-zone-id {$host['id']}`,true);
	
	
	foreach($host as $cname=>$val) {

		if($cname == "id") {
			continue;
		}

		foreach($res['ResourceRecordSets'] as $set) {
			
			if(rtrim($set['Name'],".") == $cname) {
				$hosts[$k][$cname] = "UPSERT";
			}

		}

	}

}

//update route53

foreach($hosts as $host=>$cnames) {

	$id = $cnames['id'];

	foreach($cnames as $cname=>$action) {
	
		if($cname == "id") {
			continue;
		}

		if(strlen($action)<=0) {
			
			$template['Changes'][0]['Action'] = "CREATE";
	
		} else {
			
			$template['Changes'][0]['Action'] = "UPSERT";

		}

		$template['Changes'][0]['ResourceRecordSet']['ResourceRecords'][0]['Value'] = $ipaddr;
		$template['Changes'][0]['ResourceRecordSet']['Name'] = $cname;
		$template['Changes'][0]['ResourceRecordSet']['TTL'] = 300;


		$json = json_encode($template);

		$tmpFile = "/tmp/{$cname}.json";
	
		file_put_contents($tmpFile,$json);

		passthru("aws route53 change-resource-record-sets --hosted-zone-id {$id} --change-batch file://{$tmpFile}");
		

		unlink($tmpFile);
	}

}


print_r($hosts);
echo $ipaddr;