Autorenew noip.com hosts

#!/usr/bin/env ruby

# Summary:  The script avoid the need to manualy login every month in http://www.noip.com and update your domains to keep them alive.
#           It will automaticaly retrieve his current public IP from http://checkip.dyndns.org/
# Author: Felipe Molina (@felmoltor)
# Date: July 2013
# License: GPLv3

require 'date'
require 'mechanize'

def getMyCurrentIP()
    m = Mechanize.new
    m.user_agent_alias = 'Windows IE 8'

    ip_page = m.get("http://checkip.dyndns.org/")
    ip = ip_page.root.xpath("//body").text.gsub(/^.*: /,"")
    return ip
end

# ================

def setMyCurrentNoIP(user,password,my_public_ip)

    updated_hosts = []

    m = Mechanize.new
    m.user_agent_alias = 'Windows IE 8'

    loginpage = m.get("https://www.noip.com/login/")

    members_page = loginpage.form_with(:id => 'clogs') do |form|
        form.username = user
        form.password = password
    end.submit

    # Once successfuly loged in, access to DNS manage page
    dns_page = m.get("https://www.noip.com/members/dns/")
    dns_page.links_with(:text => "Modify").each do |link|
        # Update all the domains with my current IP
        update_host_page = m.click(link)
        hostname = update_host_page.forms[0].field_with(:name => "host[host]").value
        domain = update_host_page.forms[0].field_with(:name => "host[domain]").value
        updated_hosts << "#{hostname}.#{domain}"
        update_host_page.forms[0].field_with(:name => "host[ip]").value = my_public_ip
        update_host_page.forms[0].submit
    end

    return updated_hosts
end

# ================

puts "======= #{Date.today.to_s} ========"

if ARGV[0].nil? or ARGV[1].nil?
    puts "Error. Especifica el usuario y la contrasenna para acceder a tu cuenta de noip.com"
    exit(1)
else
    user = ARGV[0]
    password = ARGV[1]
    # domain_to_update = ARGV[3] if !ARGV[3].nil? # TODO: If you want to keep alive only one domain, specify it

    puts "Getting my current public IP..."
    my_public_ip = getMyCurrentIP()
    puts "Done: #{my_public_ip}"
    puts "Sending Keep Alive request to noip.com..."
    updated_hosts = setMyCurrentNoIP(user,password,my_public_ip)
    if !updated_hosts.nil? and updated_hosts.size > 0
        puts "Done. Keeping alive #{updated_hosts.size} host with IP '#{my_public_ip}':"
        updated_hosts.each do |host|
            puts "- #{host}"
        end
    else
        $stderr.puts "There was an error updating the domains of noip.com or there were no hosts to update"
    end
end

puts "==============================="