Konstantin Antselovich

At times I want to reach my home computer, so I had a dynamic DNS service that keeps a DNS record ( like myhomeip.dyndns.org) in sync with your home IP address that changes from time to time.

I got fed up with free service from DynDNS: your record will disappear in 30 days unless you login into their site and "confirm" it. DynDNS annoys you on purpose, so you buy their "pro" service. I do not like being annoyed, and I do not see a point of paying for DynDNS service -- their value proposition is weak, as anyone can create a script that updates DNS records.

I have a website that is protected by ClouldFlare service. ClouldFlare offers an API that can be used to update DNS records, so I wrote a script for Mikrotik RouterOS that does just that.



Note that you need RouterOS v6 ( as fetch command supports https only since version 6.0rc12


##############Script Settings##################

:local CFemail "clouldflare email login "
:local CFtkn "api access token"
:local CFzone "clouldflare website, example: example.com"
:local CFid "dns record id, available via rec_load_all API call, example: 12345"
:local CFtype "A"
:local CFttl "300"
:local CFservicemode "0"
:local CFDomain "FQDN DNS record that you will be updating, example: myhomeip.exmaple.com"

############## Build CF API Url ################
:local CFurl "https://www.cloudflare.com/api_json.html\3F"
:set CFurl ($CFurl . "a=rec_edit&tkn=$CFtkn&id=$CFid");
:set CFurl ($CFurl . "&email=$CFemail&z=$CFzone&type=$CFtype");
:set CFurl ($CFurl . "&name=$CFDomain&service_mode=$CFservicemode&ttl=$CFttl");

:local WANInter "name of the outing network interface on mikrotik router, example: ether1-gateway"

###############################################

:local IpCurrent [/ip address get [find interface=$WANInter] address];
:for i from=( [:len $IpCurrent] - 1) to=0 do={
:if ( [:pick $IpCurrent $i] = "/") do={
:local NewIP [:pick $IpCurrent 0 $i];
:if ([:resolve $CFDomain] != $NewIP) do={
:log info "Will update: $NewIP"
/tool fetch mode=https url="$CFurl&content=$NewIP" keep-result=no
:log info "CF Update: $CFDomain - $NewIP"
}
}
}




http://www.cloudflare.com/docs/client-api.html
http://wiki.mikrotik.com/wiki/Manual:Scripting

This entry was posted on Sunday, October 6th, 2013 at 1:32 pm and is filed under api, clouldflare, computer, dns, dynamic, geek, mikrotik, routeros. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.