Stupid and simple Dynamic DNS script based on Linode

DDNS_linode.rb

require 'open-uri'
require 'json'
require 'net/http'

API_KEY = "YOUR API KEY HERE"
DOMAINID = "Your DomainID"
RESOURCEID = "The AAA resource ID already created in the DNS dashboard"
TARGET = "[remote_addr]" # Drop the brackets when using literal IPs. With [remote_addr] Linode will use the IP from where the request is received

# Uncomment this line if the SSL certificate is complaining. Disclosure:This is not a safe method
# OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE

current_ip = Net::HTTP.get(URI("https://api.ipify.org"))

request = open("https://api.linode.com/?api_key=#{API_KEY}&api_action=domain.resource.list&DomainID=#{DOMAINID}&ResourceID=#{RESOURCEID}",
                {ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE}).read

ip_in_records = JSON.parse(request)["DATA"].first["TARGET"] #Assuming the API KEY can only access one domain

unless ip_in_records == current_ip
  puts "Actualizamos IP. Ip en el registo: #{ip_in_records}; Ip a la que se actualizara: #{current_ip}"
  request = open("https://api.linode.com/?api_key=#{API_KEY}&api_action=domain.resource.update&DomainID=#{DOMAINID}&ResourceID=#{RESOURCEID}&Target=#{TARGET}").read
  puts request
else
  puts "La IP no ha cambiado"
end