DDNS using Route53

ddns_route53.py

#!/usr/bin/python

# Author: jose@josehidalgo.net,
# github.com/joseche

# Requirements:
# pip install boto urlopen

# Credentials:
# You need to have your AWS keys in this file ~/.aws/credentials:
# [default]
# aws_access_key_id=<YOUR ACCESS KEY ID>
# aws_secret_access_key=<YOUR SECRET KEY>


import sys
import getopt
import boto.route53
import traceback
from json import load
from urllib2 import urlopen
import datetime


verbose = False

def verb(msg):
    global verbose
    if verbose:
        print msg

def usage():
    print """
Missing arguments, use -d <domain> -r <record_name>
optional:
   boto profile: -p <profile_name>
   verbose: -v
"""
    sys.exit(1)

def main(argv):
    global verbose
    profile = 'default'
    domain  = None
    record  = None
    rrset   = None
    awsip   = None
    conn    = None

    try:
        opts, args = getopt.getopt(argv,"p:d:r:v",["profile=","domain=","record="])
    except getopt.GetoptError:
        usage()

    for opt, arg in opts:
        if opt == '-p':
            profile = arg
        elif opt == '-d':
            domain  = arg
        elif opt == '-r':
            record  = arg
        elif opt == '-v':
            verbose = True

    if (domain is None) or (record is None):
        usage()

    # sanity
    if domain[-1]!='.':
        domain = domain + '.'
    if record.count('.')<1:
        record = record +'.'+domain
        

    verb('domain: '+domain)
    verb('record: '+record)
    if profile!='default':
        verb('profile: '+profile)

    curip = load(urlopen('http://httpbin.org/ip'))['origin']
    verb('Current public ip: '+curip)
        
    try:
        conn  = boto.route53.connect_to_region('us-east-1', profile_name=profile)
        if conn:
            zone  = conn.get_zone(domain)
            if zone:
                rrset = zone.get_a(record, False)
                if rrset:
                    awsip = rrset.to_print()
                    verb(record+' is set to '+awsip)
                    if awsip==curip:
                        print 'Update not necessary'
                    else:
                        now = datetime.datetime.now()
                        print 'Updating '+record+' to '+curip+' at '+str(now)
                        status = zone.update_record(rrset, curip)
                        print status
                    
                else:
                    print 'Record: '+record+ ' not found!, check your zone'
            else:
                print 'Zone '+domain+ ' not found'
        else:
            print 'Unable to connect, check your boto credentials'
            
    except:
        print traceback.format_exc(False)
    finally:
        if conn:
            conn.close()

if __name__ == "__main__":
    main(sys.argv[1:])