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dyndnsd/lib/dyndnsd.rb

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#!/usr/bin/env ruby
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require 'etc'
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require 'logger'
require 'ipaddr'
require 'json'
require 'yaml'
require 'rack'
require 'metriks'
require 'metriks/reporter/graphite'
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require 'dyndnsd/generator/bind'
require 'dyndnsd/updater/command_with_bind_zone'
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require 'dyndnsd/responder/dyndns_style'
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require 'dyndnsd/responder/rest_style'
require 'dyndnsd/database'
require 'dyndnsd/version'
module Dyndnsd
def self.logger
@logger
end
def self.logger=(logger)
@logger = logger
end
class LogFormatter
def call(lvl, time, progname, msg)
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"[%s] %-5s %s\n" % [Time.now.strftime('%Y-%m-%d %H:%M:%S'), lvl, msg.to_s]
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end
end
class Daemon
def initialize(config, db, updater)
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@users = config['users']
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@domain = config['domain']
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@db = db
@updater = updater
@db.load
@db['serial'] ||= 1
@db['hosts'] ||= {}
(@db.save; @updater.update(@db)) if @db.changed?
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end
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def call(env)
return [422, {'X-DynDNS-Response' => 'method_forbidden'}, []] if env["REQUEST_METHOD"] != "GET"
return [422, {'X-DynDNS-Response' => 'not_found'}, []] if env["PATH_INFO"] != "/nic/update"
handle_dyndns_request(env)
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end
def self.run!
if ARGV.length != 1
puts "Usage: dyndnsd config_file"
exit 1
end
config_file = ARGV[0]
if not File.file?(config_file)
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puts "Config file not found!"
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exit 1
end
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puts "DynDNSd version #{Dyndnsd::VERSION}"
puts "Using config file #{config_file}"
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config = YAML::load(File.open(config_file, 'r') { |f| f.read })
setup_logger(config)
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Dyndnsd.logger.info "Starting..."
# drop priviliges as soon as possible
# NOTE: first change group than user
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Process::Sys.setgid(Etc.getgrnam(config['group']).gid) if config['group']
Process::Sys.setuid(Etc.getpwnam(config['user']).uid) if config['user']
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setup_traps()
setup_monitoring(config)
setup_rack(config)
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end
private
def is_fqdn_valid?(hostname)
return false if hostname.length < @domain.length + 2
return false if not hostname.end_with?(@domain)
name = hostname.chomp(@domain)
return false if not name.match(/^[a-zA-Z0-9_-]+\.$/)
true
end
def is_ip_valid?(ip)
begin
IPAddr.new(ip)
return true
rescue ArgumentError
return false
end
end
def extract_v4_and_v6_address(env, params)
return [] if not params["myip"]
begin
IPAddr.new(params["myip"], Socket::AF_INET)
IPAddr.new(params["myip6"], Socket::AF_INET6)
[params["myip"], params["myip6"]]
rescue ArgumentError
[]
end
end
def extract_myips(env, params)
# require presence of myip parameter as valid IPAddr (v4) and valid myip6
return extract_v4_and_v6_address(env, params) if params.has_key?("myip6")
# check whether myip parameter has valid IPAddr
return [params["myip"]] if params.has_key?("myip") and is_ip_valid?(params["myip"])
# check whether X-Real-IP header has valid IPAddr
return [env["HTTP_X_REAL_IP"]] if env.has_key?("HTTP_X_REAL_IP") and is_ip_valid?(env["HTTP_X_REAL_IP"])
# fallback value, always present
[env["REMOTE_ADDR"]]
end
def process_changes(hostnames, myips)
changes = []
hostnames.each do |hostname|
# myips order is always deterministic
if (not @db['hosts'].include? hostname) or (@db['hosts'][hostname] != myips)
@db['hosts'][hostname] = myips
changes << :good
Metriks.meter('requests.good').mark
else
changes << :nochg
Metriks.meter('requests.nochg').mark
end
end
changes
end
def update_db()
@db['serial'] += 1
Dyndnsd.logger.info "Committing update ##{@db['serial']}"
@db.save
@updater.update(@db)
Metriks.meter('updates.committed').mark
end
def handle_dyndns_request(env)
params = Rack::Utils.parse_query(env["QUERY_STRING"])
# require hostname parameter
return [422, {'X-DynDNS-Response' => 'hostname_missing'}, []] if not params["hostname"]
hostnames = params["hostname"].split(',')
# check for invalid hostnames
invalid_hostnames = hostnames.select { |hostname| not is_fqdn_valid?(hostname) }
return [422, {'X-DynDNS-Response' => 'hostname_malformed'}, []] if invalid_hostnames.any?
user = env["REMOTE_USER"]
# check for hostnames that the user does not own
forbidden_hostnames = hostnames - @users[user]['hosts']
return [422, {'X-DynDNS-Response' => 'host_forbidden'}, []] if forbidden_hostnames.any?
myips = extract_myips(env, params)
# require at least one IP to update
return [422, {'X-DynDNS-Response' => 'host_forbidden'}, []] if myips.empty?
Metriks.meter('requests.valid').mark
Dyndnsd.logger.info "Request to update #{hostnames} to #{myips} for user #{user}"
changes = process_changes(hostnames, myips)
update_db if @db.changed?
[200, {'X-DynDNS-Response' => 'success'}, [changes, myips]]
end
# SETUP
def self.setup_logger(config)
if config['logfile']
Dyndnsd.logger = Logger.new(config['logfile'])
else
Dyndnsd.logger = Logger.new(STDOUT)
end
Dyndnsd.logger.progname = "dyndnsd"
Dyndnsd.logger.formatter = LogFormatter.new
end
def self.setup_traps()
Signal.trap('INT') do
Dyndnsd.logger.info "Quitting..."
Rack::Handler::WEBrick.shutdown
end
Signal.trap('TERM') do
Dyndnsd.logger.info "Quitting..."
Rack::Handler::WEBrick.shutdown
end
end
def self.setup_monitoring(config)
# configure metriks
if config['graphite']
host = config['graphite']['host'] || 'localhost'
port = config['graphite']['port'] || 2003
options = {}
options[:prefix] = config['graphite']['prefix'] if config['graphite']['prefix']
reporter = Metriks::Reporter::Graphite.new(host, port, options)
reporter.start
else
reporter = Metriks::Reporter::ProcTitle.new
reporter.add 'good', 'sec' do
Metriks.meter('requests.good').mean_rate
end
reporter.add 'nochg', 'sec' do
Metriks.meter('requests.nochg').mean_rate
end
reporter.start
end
end
def self.setup_rack(config)
# configure daemon
db = Database.new(config['db'])
updater = Updater::CommandWithBindZone.new(config['domain'], config['updater']['params']) if config['updater']['name'] == 'command_with_bind_zone'
# configure rack
app = Daemon.new(config, db, updater)
app = Rack::Auth::Basic.new(app, "DynDNS") do |user,pass|
allow = ((config['users'].has_key? user) and (config['users'][user]['password'] == pass))
if not allow
Dyndnsd.logger.warn "Login failed for #{user}"
Metriks.meter('requests.auth_failed').mark
end
allow
end
if config['responder'] == 'RestStyle'
app = Responder::RestStyle.new(app)
else
app = Responder::DynDNSStyle.new(app)
end
Rack::Handler::WEBrick.run app, :Host => config['host'], :Port => config['port']
end
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end
end