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cloudflare_dyndns_update.rb
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330
cloudflare_dyndns_update.rb
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#!/usr/bin/env ruby
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# -----
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#
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# Copyright (c) 2024 mahesh
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy of
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# this software and associated documentation files (the "Software"), to deal in
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# the Software without restriction, including without limitation the rights to
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# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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# of the Software, and to permit persons to whom the Software is furnished to do
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# so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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#
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# -----
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require 'pp'
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require 'optparse'
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require 'net/http'
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require 'uri'
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require 'json'
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require 'yaml'
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require 'logger'
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# ------------------
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# Helper Classes
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# ------------------
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class CloudflareDynDNSUpdater
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attr_accessor :options, :myip, :config, :cache
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def initialize(options)
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@logger = Logger.new(STDOUT)
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@options = options
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@config = read_config_file
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@logger.level = @options[:debug] ? Logger::DEBUG : Logger::INFO
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@logger.info($0) { "Starting..." }
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@query_info = Hash.new
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@cache_updated = false
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if @options[:api_key].empty?
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@logger.error "Need Cloudflare API key to proceed"
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exit 1
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end
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end
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def run()
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#
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# Load the cache so we know hosts and their IPs were updated
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# in the past
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#
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@cache = read_cache_file
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@logger.debug @cache.inspect
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#
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# Get the Public IP (WAN). We will compare this with the IP
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# in the cache to know if the IP has changed and needs to be
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# updated in Cloudflare's DNS
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#
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@myip = get_public_ip
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@logger.info "Public IP: #{@myip}"
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#
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# Query DNS records
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#
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process_dns
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# Write updated cache
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if @cache_updated
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write_cache_file
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end
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end
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def report()
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@logger.info($0) { "Done." }
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end
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private
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#
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# Read configuration file, which contains the list of hosts and
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# their credentials. Configuration file uses the YAML format
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# and has the following template:
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#
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# -----------
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# hosts:
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# - host: hostone.com
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# zone_id: <cloudflare hostone zone_id>
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# - host: hosttwo.com
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# zone_id: <cloudflare hosttwo zone_id>
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# - ...
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# -----------
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#
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# Default location of the configuration file is:
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#
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# ~/.cfdyndns.yaml
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#
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# Alternate location may be provided with [-f|--config_file] option
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#
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def read_config_file()
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if File.exists?(options[:config_file])
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return YAML.load_file(options[:config_file])
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else
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@logger.error "Config file [#{options[:config_file]}] missing!"
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end
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end
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#
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# To avoid frequent queries to Cloudflare, store the status of
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# latest update to a cache file. Cloudflare is updated only if
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# our public IP has changed.
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#
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# Default location of cache file is:
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#
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# ~/.cfdyndns.cache
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#
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# Alternate location may be provided with [-c|--cache_file] option
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#
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def read_cache_file()
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#
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# Update to Cloudflare may be forced by forgetting cached
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# values. This is controlled by the [-u|--force_update] option
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#
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if options[:force_update]
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if File.exists?(options[:cache_file])
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File.delete(options[:cache_file])
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end
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end
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#
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# Load the cache file
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#
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return File.exists?(options[:cache_file]) ? YAML.load_file(options[:cache_file]) : {}
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end
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#
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# Store IPs from current update into cache
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#
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def write_cache_file()
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@logger.debug @cache.inspect
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@logger.info "Writing updated cache file"
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File.open(options[:cache_file], "w") {|f| f.write(@cache.to_yaml)}
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end
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#
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# Acquire the public IP from an external service
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#
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def get_public_ip()
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return Net::HTTP.get(URI('http://ipinfo.io/ip'))
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end
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#
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# Query Cloudflare for Domains info
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#
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def process_dns()
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#
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# Handle each host in the config file at a time
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#
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@config['hosts'].each {|h|
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if @cache[h['host']] && @myip.eql?(@cache[h['host']]['ip'])
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@logger.info "Skipping #{h['host']} - Already pointing to #{@myip}"
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else
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query_sts_good = query_dns(h)
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if query_sts_good
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update_sts_good = update_dns(h['host'])
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end
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end
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}
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end
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def query_dns(host)
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sts_good = false
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url = "https://api.cloudflare.com/client/v4/zones/#{host['zone_id']}/dns_records"
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@logger.debug "Querying Cloudflare for host [#{host['host']}] - #{url}"
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uri = URI(url)
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Net::HTTP.start(uri.host, uri.port, :use_ssl => true) do |http|
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request = Net::HTTP::Get.new uri
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request.add_field 'Content-Type', 'application/json'
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request.add_field 'Authorization', "Bearer #{@options[:api_key]}"
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request.add_field 'User-Agent', "#{@options[:user_agent]}"
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response = http.request request # Net::HTTPResponse object
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sts_good = handle_query(JSON.parse(response.body))
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end
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return sts_good
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end
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def handle_query(body)
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if body['success']
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body['result'].each {|entry|
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if entry['type'].eql?('A')
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@query_info[entry['name']] = entry
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return true
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end
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}
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return false
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else
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body['errors'].each {|err|
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@logger.error "Error status returned #{err['code']}: #{err['message']}"
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}
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return false
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end
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end
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#
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# Update Cloudflare if IP has changed
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#
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def update_dns(host)
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sts_good = false
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#
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# Handle each host in the config file at a time
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#
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if @query_info.has_key?(host)
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# Use information from query response when possible
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q_info = @query_info[host]
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url = "https://api.cloudflare.com/client/v4/zones/#{q_info['zone_id']}/dns_records/#{q_info['id']}"
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@logger.debug "Updating Cloudflare for host [#{host['host']}] - #{url}"
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uri = URI(url)
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request_body = {
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'type' => q_info['type'],
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'name' => q_info['name'],
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'content' => @myip
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}
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@logger.debug request_body.to_json
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Net::HTTP.start(uri.host, uri.port, :use_ssl => true) do |http|
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request = Net::HTTP::Patch.new uri
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request.add_field 'Content-Type', 'application/json'
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request.add_field 'Authorization', "Bearer #{@options[:api_key]}"
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request.add_field 'User-Agent', "#{@options[:user_agent]}"
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request.body = request_body.to_json
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response = http.request request # Net::HTTPResponse object
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sts_good = handle_update(JSON.parse(response.body))
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end
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return sts_good
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else
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@logger.error "Did not find query information for host #{host}"
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end
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return sts_good
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end
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def handle_update(body)
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if body['success']
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entry = body['result']
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@logger.info "Successfully updated DNS entry type #{entry['type']} - #{entry['name']} - #{entry['content']}"
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@cache[entry['name']] = {'ip' => entry['content']}
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@cache_updated = true
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return true
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else
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body['errors'].each {|err|
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@logger.error "Error status returned #{err['code']}: #{err['message']}"
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}
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return false
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end
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end
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end
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# -------------------
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# Options parsing
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# -------------------
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#
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# Default values of command line options
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#
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options = {
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:config_file => "#{Dir.home}/.cfdyndns.yaml",
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:cache_file => "#{Dir.home}/.cfdyndns.cache",
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:user_agent => 'HeshApps Cloudflare Dynamic DNS Updater v1.0',
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:force_update => false,
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:debug => false,
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:api_key => ''
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}
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#
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# Get command line options
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#
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op = OptionParser.new do |opts|
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opts.banner = "Usage: cloudflare_dyndns_update.rb [options]"
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opts.on("-d", "--debug", "Enable debug messages") do |debug|
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options[:debug] = debug
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end
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opts.on("-u", "--force_update", "Force DNS update") do |force_update|
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options[:force_update] = force_update
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end
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opts.on("-f", "--config_file FILE", "Location of configuration file") do |file|
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options[:config_file] = file
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end
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opts.on("-c", "--cache_file FILE", "Location of cache file") do |file|
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options[:cache_file] = file
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end
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opts.on("-k", "--api_key KEY", "Cloudflare API authorization key") do |key|
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options[:api_key] = key
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end
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opts.on("-h", "--help", "Display this help") do |help|
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options[:help] = help
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end
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end
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op.parse!
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if options[:help]
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puts op.help
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exit
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end
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# ------------------
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# Execution part
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# ------------------
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updater = CloudflareDynDNSUpdater.new(options)
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updater.run
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updater.report
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#
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# Mahesh Asolkar, 2024
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# vim: ai ts=2 sts=2 et sw=2 filetype=ruby
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