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union_python3.py
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union_python3.py
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"""
DDNS Lambda Python3 Script
This script will perform the following functions.
if no CNAME or ZONE tags is set on the ec2 instance, and not using a custom dhcp option set:
1. Script will do nothing
if no CNAME or ZONE tags are set, but are using a custom dhcp option set with
a hosted zone created, which matches the domain name.
1. An 'A' record is created to the IP
2. A 'PTR" record is create to the DNS name
if a CNAME tag is set.
1. Creates a CNAME to the DNS name
2. Creates a PTR record to the CNAME
if a ZONE tag is set.
1. Creates an 'A' record to the IP
2. Creates a 'PTR" record to the DNS name
"""
import json
import sys
import datetime
import random
import logging
import re
import uuid
import time
import inspect
import boto3
from botocore.exceptions import ClientError
# Setting Global Variables
LOGGER = logging.getLogger()
LOGGER.setLevel(logging.INFO)
ACCOUNT = None
REGION = None
SNS_CLIENT = None
print('Loading function ' + datetime.datetime.now().time().isoformat())
def lineno(): # pragma: no cover
"""
Returns the current line number in our script
:return:
"""
return str(' - line number: ' + str(inspect.currentframe().f_back.f_lineno))
def get_sns_client():
"""
Get sns client
:return:
"""
try:
return boto3.client('sns')
except ClientError as err:
print("Unexpected error: %s" % err)
def get_route53_client():
"""
Get route53 client
:return:
"""
try:
return boto3.client('route53')
except ClientError as err:
print("Unexpected error: %s" % err)
def get_ec2_client():
"""
Get ec2 client
:return:
"""
try:
return boto3.client('ec2')
except ClientError as err:
print("Unexpected error: %s" % err)
def get_dynamodb_client():
"""
Get dynamodb client
:return:
"""
try:
return boto3.client('dynamodb')
except ClientError as err:
print("Unexpected error: %s" % err)
def lambda_handler(
event,
context,
dynamodb_client=get_dynamodb_client(),
compute=get_ec2_client(),
route53=get_route53_client(),
sns_client=get_sns_client()
):
"""
Check to see whether a DynamoDB table already exists. If not, create it.
This table is used to keep a record of instances that have been created
along with their attributes. This is necessary because when you terminate an instance
its attributes are no longer available, so they have to be fetched from the table.
:param event:
:param context:
:param dynamodb_client:
:param compute:
:param route53:
:param sns_client:
:return:
"""
LOGGER.info("event: %s", str(event) + lineno())
LOGGER.info("context: %s", str(context) + lineno())
SNS_CLIENT = sns_client
caller_response = []
# Checking to make sure there is a dynamodb table named DDNS or we will create it
tables = list_tables(dynamodb_client)
LOGGER.info("tables: %s", str(tables))
if 'DDNS' in tables['TableNames']:
LOGGER.info('DynamoDB table already exists')
else:
create_table(dynamodb_client, 'DDNS')
# Set variables
# Get the state from the Event stream
state = event['detail']['state']
LOGGER.debug("instance state: %s", str(state) + lineno())
# Get the instance id, region, and tag collection
instance_id = event['detail']['instance-id']
LOGGER.debug("instance id: %s", str(instance_id) + lineno())
ACCOUNT = event['account']
region = event['region']
REGION = region
LOGGER.debug("region: %s", str(region) + lineno())
# Only doing something if the state is running
if state == 'running':
LOGGER.debug("sleeping for 60 seconds %s", lineno())
if "pytest" in sys.modules:
# called from within a test run
time.sleep(1)
else:
# called "normally"
time.sleep(60)
# Get instance information
instance = get_instances(compute, instance_id)
# Remove response metadata from the response
if 'ResponseMetadata' in instance:
instance.pop('ResponseMetadata')
# Remove null values from the response. You cannot save a dict/JSON
# document in DynamoDB if it contains null values
LOGGER.debug("instance: %s", str(instance) + lineno())
instance = remove_empty_from_dict(instance)
instance_dump = json.dumps(instance, default=json_serial)
instance_attributes = json.loads(instance_dump)
LOGGER.debug("instance_attributes: %s", str(instance_attributes) + lineno())
LOGGER.debug("trying to put instance information in "
"dynamo table %s", str(instance_attributes) + lineno())
put_item_in_dynamodb_table(dynamodb_client, 'DDNS', instance_id, instance_attributes)
LOGGER.debug("done putting item in dynamo table %s", lineno())
else:
# Fetch item from DynamoDB
LOGGER.debug("Fetching instance information from dynamodb %s", lineno())
instance = get_item_from_dynamodb_table(dynamodb_client, 'DDNS', instance_id)
LOGGER.debug("instance: %s", str(instance) + lineno())
# Get the instance tags and reorder them because we want a zone created before CNAME
try:
tags = instance['Reservations'][0]['Instances'][0]['Tags']
except:
tags = []
LOGGER.debug("tags are: %s", str(tags) + lineno())
tag_type = determine_tag_type(tags)
if tag_type == 'invalid':
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION,
"Must have either CNAME or ZONE in tags, can not have both tags" + lineno())
exit(-1)
LOGGER.debug("Get instance attributes %s", lineno())
LOGGER.debug("instance: %s", str(instance) + lineno())
LOGGER.debug("type: %s", str(type(instance)) + lineno())
if instance and 'Reservations' in instance:
LOGGER.debug("reservations: %s", str(instance['Reservations']) + lineno())
LOGGER.debug("reservations: %s", str(instance['Reservations'][0]) + lineno())
LOGGER.debug("reservations: %s", str(instance['Reservations'][0]['Instances']) + lineno())
LOGGER.debug("reservations:"
" %s", str(instance['Reservations'][0]['Instances'][0]) + lineno())
private_ip = instance['Reservations'][0]['Instances'][0]['PrivateIpAddress']
private_dns_name = instance['Reservations'][0]['Instances'][0]['PrivateDnsName']
private_host_name = private_dns_name.split('.')[0]
LOGGER.debug("private ip: %s", str(private_ip) + lineno())
LOGGER.debug("private_dns_name: %s", str(private_dns_name) + lineno())
LOGGER.debug("private_host_name: %s", str(private_host_name) + lineno())
public_ip = None
public_dns_name = None
if 'PublicIpAddress' in instance['Reservations'][0]['Instances'][0]:
LOGGER.debug('instance has public ip address key')
try:
LOGGER.debug("instance: %s", str(instance) + lineno())
if 'Reservations' in instance:
LOGGER.debug("reservations: %s", str(instance['Reservations'][0]))
if 'Instances' in instance['Reservations'][0]:
LOGGER.debug("instances: %s", str(instance['Reservations'][0]['Instances'][0]))
public_ip = instance['Reservations'][0]['Instances'][0]['PublicIpAddress']
LOGGER.debug("public_ip: %s", str(public_ip) + lineno())
if public_ip and 'PublicDnsName' not in instance['Reservations'][0]['Instances'][0]:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION,
"Could not find PublicDnsName for public instance,"
" check that vpc has dns hostnames enabled:" + lineno())
exit()
else:
public_dns_name = instance['Reservations'][0]['Instances'][0]['PublicDnsName']
LOGGER.debug("public_dns_name: %s", str(public_dns_name) + lineno())
public_host_name = public_dns_name.split('.')[0]
LOGGER.debug("public_host_name: %s", str(public_host_name))
except BaseException as err:
LOGGER.info("Instance has no public IP or host name %s", str(err))
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" + str(err) + lineno())
# Get the subnet mask of the instance
subnet_id = instance['Reservations'][0]['Instances'][0]['SubnetId']
LOGGER.debug("subnet_id: %s", str(subnet_id) + lineno())
cidr_block = get_subnet_cidr_block(compute, subnet_id)
LOGGER.debug("cidr_block: %s", str(cidr_block) + lineno())
subnet_mask = int(cidr_block.split('/')[-1])
LOGGER.debug("subnet_mask: %s", str(subnet_mask) + lineno())
reversed_ip_address = reverse_list(private_ip)
reversed_domain_prefix = get_reversed_domain_prefix(subnet_mask, private_ip)
reversed_domain_prefix = reverse_list(reversed_domain_prefix)
LOGGER.debug("reversed_domain_prefix is: %s", str(reversed_domain_prefix) + lineno())
# Set the reverse lookup zone
reversed_lookup_zone = reversed_domain_prefix + 'in-addr.arpa.'
LOGGER.info("The reverse lookup zone for this instance is: %s", str(reversed_lookup_zone))
# Get VPC id
vpc_id = instance['Reservations'][0]['Instances'][0]['VpcId']
# Are DNS Hostnames and DNS Support enabled?
if is_dns_hostnames_enabled(compute, vpc_id):
LOGGER.debug("DNS hostnames enabled for %s", str(vpc_id) + lineno())
else:
LOGGER.debug("DNS hostnames disabled for %s. You have to enable DNS hostnames \
to use Route 53 private hosted zones. %s", vpc_id, lineno())
if is_dns_support_enabled(compute, vpc_id):
LOGGER.debug("DNS support enabled for %s", str(vpc_id) + lineno())
else:
LOGGER.debug("DNS support disabled for %s. You have to enabled DNS support \
to use Route 53 private hosted zones. %s", str(vpc_id), lineno())
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, 'DNS support disabled for '+
str(vpc_id)+'. You have to enabled DNS support \
to use Route 53 private hosted zones. ' + lineno())
exit()
# Create the public and private hosted zone collections.
# These are collections of zones in Route 53.
hosted_zones = list_hosted_zones(route53)
LOGGER.debug("hosted_zones: %s", str(hosted_zones) + lineno())
private_hosted_zones = get_private_hosted_zones(hosted_zones)
LOGGER.debug("private_hosted_zones: %s", str(list(private_hosted_zones)) + lineno())
private_hosted_zone_collection = get_private_hosted_zone_collection(private_hosted_zones)
LOGGER.debug("private_hosted_zone_collection: %s",
str(list(private_hosted_zone_collection)) + lineno())
public_hosted_zones = get_public_hosted_zones(hosted_zones)
LOGGER.debug("public_hosted_zones: %s", str(list(public_hosted_zones)) + lineno())
public_hosted_zones_collection = get_public_hosted_zone_collection(public_hosted_zones)
LOGGER.debug("public_hosted_zones_collection:"
" %s", str(list(public_hosted_zones_collection)) + lineno())
# Check to see whether a reverse lookup zone for the instance
# already exists. If it does, check to see whether
# the reverse lookup zone is associated with the instance's
# VPC. If it isn't create the association. You don't
# need to do this when you create the reverse lookup
# zone because the association is done automatically.
LOGGER.info("reversed_lookup_zone: %s", str(reversed_lookup_zone) + lineno())
reverse_zone = None
for record in hosted_zones['HostedZones']:
LOGGER.debug("record name: %s", str(record['Name']) + lineno())
if record['Name'] == reversed_lookup_zone:
reverse_zone = record['Name']
break
if reverse_zone:
LOGGER.debug("Reverse lookup zone found: %s", str(reversed_lookup_zone) + lineno())
reverse_lookup_zone_id = get_zone_id(route53, reversed_lookup_zone)
LOGGER.debug("reverse_lookup_zone_id: %s", str(reverse_lookup_zone_id) + lineno())
reverse_hosted_zone_properties = get_hosted_zone_properties(route53, reverse_lookup_zone_id)
LOGGER.debug("reverse_hosted_zone_properties:"
" %s", str(reverse_hosted_zone_properties) + lineno())
if vpc_id in map(lambda x: x['VPCId'], reverse_hosted_zone_properties['VPCs']):
LOGGER.info("Reverse lookup zone %s is associated \
with VPC %s %s", reverse_lookup_zone_id, vpc_id, lineno())
else:
LOGGER.info("Associating zone %s with VPC %s", reverse_lookup_zone_id, vpc_id)
try:
associate_zone(route53, reverse_lookup_zone_id, region, vpc_id)
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
LOGGER.debug("%s", str(err)+lineno())
else:
LOGGER.info("No matching reverse lookup zone, so we will create one %s", lineno())
# create private hosted zone for reverse lookups
if state == 'running':
create_reverse_lookup_zone(route53, instance, reversed_domain_prefix, region)
reverse_lookup_zone_id = get_zone_id(route53, reversed_lookup_zone)
# Wait a random amount of time. This is a poor-mans back-off
# if a lot of instances are launched all at once.
time.sleep(random.random())
if tag_type == 'cname':
# We must have a cname because we want reverse dns to point to the A record
cname = get_cname_from_tags(tags)
cname_prefix = cname.split('.')[0]
if not cname:
publish_to_sns(
SNS_CLIENT,
ACCOUNT, REGION,
"Must have a CNAME tag for lambda to work. "
"Please add CNAME to instance tags" + lineno()
)
LOGGER.debug("iterating through tags %s", lineno())
# Loop through the instance's tags, looking for the zone and
# cname tags. If either of these tags exist, check
# to make sure that the name is valid. If it is and
# if there's a matching zone in DNS, create A and PTR records.
for tag in tags:
LOGGER.debug("#### tag: %s", str(tag) + lineno())
if 'ZONE' in tag.get('Key', {}).lstrip().upper():
# Simple check to make sure the hostname is valid
if is_valid_hostname(tag.get('Value')):
LOGGER.debug("hostname is valid %s", lineno())
LOGGER.debug("checking if value in private:"
" %s", str(list(private_hosted_zone_collection)) + lineno())
LOGGER.debug("checking if value in public:"
" %s", str(list(public_hosted_zones_collection)) + lineno())
if tag.get('Value').lstrip().lower() in private_hosted_zone_collection:
LOGGER.debug("Private zone found: %s", str(tag.get('Value')) + lineno())
private_hosted_zone_name = tag.get('Value').lstrip().lower()
LOGGER.debug("private_zone_name: %s", str(private_hosted_zone_name) + lineno())
private_hosted_zone_id = get_zone_id(route53, private_hosted_zone_name)
LOGGER.debug("private_hosted_zone_id:"
" %s", str(private_hosted_zone_id) + lineno())
private_hosted_zone_properties = \
get_hosted_zone_properties(route53, private_hosted_zone_id)
LOGGER.debug("private_hosted_zone_properties:"
" %s", str(private_hosted_zone_properties) + lineno())
if state == 'running':
found_vpc_id = False
if 'VPCs' in private_hosted_zone_properties:
for vpc in private_hosted_zone_properties['VPCs']:
if vpc['VPCId'] == vpc_id:
found_vpc_id = True
if found_vpc_id:
LOGGER.info("Private hosted zone %s is associated with \
VPC %s %s", private_hosted_zone_id, vpc_id, lineno())
else:
LOGGER.info("Associating zone %s with \
VPC %s %s", private_hosted_zone_id, vpc_id, lineno())
try:
associate_zone(route53, private_hosted_zone_id, region, vpc_id)
except BaseException as err:
LOGGER.info('You cannot create an association with a VPC \
with an overlapping subdomain.\n', err)
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
exit()
try:
create_resource_record(
route53,
private_hosted_zone_id,
private_host_name,
private_hosted_zone_name,
'A',
private_ip
)
LOGGER.debug("appending to caller response %s", lineno())
caller_response.append('Created A record in zone id: ' +
str(private_hosted_zone_id) +
' for hosted zone ' +
str(private_host_name) + '.' +
str(private_hosted_zone_name) +
' with value: ' +
str(private_ip))
create_resource_record(
route53,
reverse_lookup_zone_id,
reversed_ip_address,
'in-addr.arpa',
'PTR',
private_dns_name
)
caller_response.append('Created PTR record in zone id: ' +
str(reverse_lookup_zone_id) +
' for hosted zone ' +
str(reversed_ip_address) +
'in-addr.arpa with value: ' +
str(private_dns_name))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
LOGGER.debug("%s", str(err)+lineno())
else:
try:
delete_resource_record(
route53,
private_hosted_zone_id,
private_host_name,
private_hosted_zone_name,
'A',
private_ip
)
caller_response.append('Deleted A record in zone id: ' +
str(private_hosted_zone_id) +
' for hosted zone ' +
str(private_host_name) + '.' +
str(private_hosted_zone_name) +
' with value: ' +
str(private_ip))
delete_resource_record(
route53,
reverse_lookup_zone_id,
reversed_ip_address,
'in-addr.arpa',
'PTR',
private_dns_name
)
caller_response.append('Deleted PTR record in zone id: ' +
str(reverse_lookup_zone_id) +
' for hosted zone ' +
str(reversed_ip_address) + '.' +
str(private_dns_name) +
' with value: ' +
str(private_dns_name))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
LOGGER.debug("%s", str(err)+lineno())
# create PTR record
elif tag.get('Value').lstrip().lower() in public_hosted_zones_collection:
LOGGER.debug("Public zone found %s", tag.get('Value') + lineno())
public_hosted_zone_name = tag.get('Value').lstrip().lower()
public_hosted_zone_id = get_zone_id(
route53,
public_hosted_zone_name,
private_zone=False
)
# create A record in public zone
if state == 'running':
try:
create_resource_record(
route53,
public_hosted_zone_id,
cname_prefix,
public_hosted_zone_name,
'A',
public_ip
)
caller_response.append('Created A record in zone id: ' +
str(public_hosted_zone_id) +
' for hosted zone ' +
str(cname_prefix) + '.' +
str(public_hosted_zone_name) +
' with value: ' +
str(public_ip))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
LOGGER.debug("%s", str(err) + lineno())
else:
try:
delete_resource_record(
route53,
public_hosted_zone_id,
cname_prefix,
public_hosted_zone_name,
'A',
public_ip
)
caller_response.append('Deleted A record in zone id: ' +
str(public_hosted_zone_id) +
' for hosted zone ' +
str(cname_prefix) + '.' +
str(public_hosted_zone_name) +
' with value: ' +
str(public_ip))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
LOGGER.debug("%s", str(err) + lineno())
else:
LOGGER.info("No matching zone found for %s", tag.get('Value'))
else:
LOGGER.info("%s is not a valid host name %s", tag.get('Value'), lineno())
# Consider making this an elif CNAME
else:
LOGGER.debug("The tag \'%s\' is not a zone tag %s", str(tag.get('Key')), lineno())
if 'CNAME' in tag.get('Key', {}).lstrip().upper():
# Simple hostname check
if is_valid_hostname(tag.get('Value')):
LOGGER.debug("CNAME hostname of %s is valid %s", str(tag.get('Value')), lineno())
# convert the cname value to lower case and strip whitespace and newline characters
icname = tag.get('Value').lstrip().lower()
LOGGER.debug("icname: %s", str(icname) + lineno())
# Gets the prefix for the cname
cname_host_name = icname.split('.')[0]
LOGGER.debug("cname_host_name: %s", str(cname_host_name) + lineno())
# Gets suffix
cname_domain_suffix = icname[icname.find('.') + 1:]
LOGGER.debug("cname_domain_suffix: %s", str(cname_domain_suffix) + lineno())
# Try and find the hosted zone with the cname suffix
cname_domain_suffix_id = get_zone_id(route53, cname_domain_suffix)
LOGGER.debug("cname_domain_suffix_id: %s", str(cname_domain_suffix_id))
# Iterate of the private hosted zones
LOGGER.debug("Iterating over private hosted zones %s", lineno())
for cname_private_hosted_zone in private_hosted_zone_collection:
LOGGER.debug("cname for private hosted zone in private hosted \
zone collection: %s", str(cname_private_hosted_zone) + lineno())
cname_private_hosted_zone_id = get_zone_id(route53, cname_private_hosted_zone)
LOGGER.debug("cname_private_hosted_zone_id:"
" %s", str(cname_private_hosted_zone_id) + lineno())
LOGGER.debug("cname_domain_suffix_id:"
" %s", str(cname_domain_suffix_id) + lineno())
if cname_domain_suffix_id == cname_private_hosted_zone_id:
LOGGER.debug("cname_domain_suffix_id:"
" %s", str(cname_domain_suffix_id) + lineno())
if cname.endswith(cname_private_hosted_zone):
LOGGER.debug("cname ends with"
" %s", str(cname_private_hosted_zone) + lineno())
# create CNAME record in private zone
if state == 'running':
try:
LOGGER.debug("creating resource record %s", lineno())
LOGGER.debug("private_dns_name:"
" %s", str(private_dns_name) + lineno())
create_resource_record(
route53,
cname_private_hosted_zone_id,
cname_host_name,
cname_private_hosted_zone,
'CNAME',
private_dns_name
)
caller_response.append('Created CNAME record in zone id: ' +
str(cname_private_hosted_zone_id) +
' for hosted zone ' +
str(cname_host_name) + '.' +
str(cname_private_hosted_zone) +
' with value: ' +
str(private_dns_name))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION,
"Unexpected error:" + str(err) + lineno())
LOGGER.debug("%s", str(err) + lineno())
else:
try:
LOGGER.debug("deleting resource record %s", lineno())
delete_resource_record(
route53,
cname_private_hosted_zone_id,
cname_host_name,
cname_private_hosted_zone,
'CNAME',
private_dns_name
)
caller_response.append('Deleted CNAME record in zone id: ' +
str(cname_private_hosted_zone_id) +
' for hosted zone ' +
str(cname_host_name) + '.' +
str(cname_private_hosted_zone) +
' with value: ' +
str(private_dns_name))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION,
"Unexpected error:" + str(err) + lineno())
LOGGER.debug("%s", str(err) + lineno())
# Only do public if there is public ip on instance
if public_dns_name:
# Iterate over the public hosted zones
LOGGER.debug("Iterating over public hosted zones %s", lineno())
for cname_public_hosted_zone in public_hosted_zones_collection:
LOGGER.debug("cname in public hosted zone:"
" %s", str(cname_public_hosted_zone) + lineno())
LOGGER.debug("cname is: %s", str(cname) + lineno())
if cname.endswith(cname_public_hosted_zone):
cname_public_hosted_zone_id = get_zone_id(
route53,
cname_public_hosted_zone,
False
)
LOGGER.debug("cname_public_hosted_zone_id:"
" %s", str(cname_public_hosted_zone_id) + lineno())
# create CNAME record in public zone
if state == 'running':
try:
create_resource_record(
route53,
cname_public_hosted_zone_id,
cname_host_name,
cname_public_hosted_zone,
'CNAME',
public_dns_name
)
caller_response.append('Created CNAME record in zone id: ' +
str(cname_public_hosted_zone_id) +
' for hosted zone ' +
str(cname_host_name) + '.' +
str(cname_public_hosted_zone) +
' with value: ' +
str(public_dns_name))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION,
"Unexpected error:" + str(err) + lineno())
LOGGER.debug("%s", str(err) + lineno())
else:
try:
delete_resource_record(
route53,
cname_public_hosted_zone_id,
cname_host_name,
cname_public_hosted_zone,
'CNAME',
public_dns_name
)
caller_response.append('Deleted CNAME record in zone id: ' +
str(cname_public_hosted_zone_id) +
' for hosted zone ' +
str(cname_host_name) + '.' +
str(cname_public_hosted_zone) +
' with value: ' +
str(public_dns_name))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION,
"Unexpected error:" +
str(err) + lineno())
LOGGER.debug("%s", str(err) + lineno())
# Is there a DHCP option set?
# Get DHCP option set configuration
LOGGER.debug("\n#############\nIterate over DHCP option sets %s\n", lineno())
try:
LOGGER.debug("trying to get dhcp option set id %s", lineno())
dhcp_options_id = get_dhcp_option_set_id_for_vpc(compute, vpc_id)
LOGGER.debug("dhcp_options_id: %s", str(dhcp_options_id) + lineno())
dhcp_configurations = get_dhcp_configurations(compute, dhcp_options_id)
LOGGER.debug("dhcp_configurations: %s", str(get_dhcp_configurations) + lineno())
except BaseException as err:
LOGGER.info("No DHCP option set assigned to this VPC %s\n", str(err)+lineno())
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
exit()
# Look to see whether there's a DHCP option set assigned to
# the VPC. If there is, use the value of the domain name
# to create resource records in the appropriate Route 53
# private hosted zone. This will also check to see whether
# there's an association between the instance's VPC and
# the private hosted zone. If there isn't, it will create it.
for configuration in dhcp_configurations:
LOGGER.debug("configuration: %s", str(configuration) + lineno())
LOGGER.debug("private hosted zones: %s", str(private_hosted_zone_collection) + lineno())
if configuration in private_hosted_zone_collection:
private_hosted_zone_name = configuration
LOGGER.debug("Private zone found %s", str(private_hosted_zone_name) + lineno())
private_hosted_zone_id = get_zone_id(route53, private_hosted_zone_name)
LOGGER.debug("Private_hosted_zone_id: %s", str(private_hosted_zone_id) + lineno())
private_hosted_zone_properties = get_hosted_zone_properties(
route53,
private_hosted_zone_id
)
LOGGER.debug("private_hosted_zone_properties:"
" %s", str(private_hosted_zone_properties) + lineno())
# create A records and PTR records
if state == 'running':
if vpc_id in map(lambda x: x['VPCId'], private_hosted_zone_properties['VPCs']):
LOGGER.info("Private hosted zone %s is associated \
with VPC %s %s", private_hosted_zone_id, vpc_id, lineno())
else:
LOGGER.info("Associating zone %s with VPC"
" %s %s", private_hosted_zone_id, vpc_id, lineno())
try:
associate_zone(route53, private_hosted_zone_id, region, vpc_id)
except BaseException as err:
LOGGER.info("You cannot create an association with a \
VPC with an overlapping subdomain. %s\n", str(err))
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
exit()
try:
if not tag_type == 'cname':
LOGGER.debug("Creating resource records %s", lineno())
create_resource_record(
route53,
private_hosted_zone_id,
private_host_name,
private_hosted_zone_name,
'A',
private_ip
)
caller_response.append('Created A record in zone id: ' +
str(private_hosted_zone_id) +
' for hosted zone ' +
str(private_host_name) + '.' +
str(private_hosted_zone_name) +
' with value: ' +
str(private_ip))
create_resource_record(
route53,
reverse_lookup_zone_id,
reversed_ip_address,
'in-addr.arpa',
'PTR',
private_dns_name
)
caller_response.append('Created PTR record in zone id: ' +
str(reverse_lookup_zone_id) +
' for hosted zone ' +
str(reversed_ip_address) +
'in-addr.arpa with value: ' +
str(private_dns_name))
else:
LOGGER.debug("Creating resource records %s", lineno())
create_resource_record(
route53,
private_hosted_zone_id,
cname_prefix,
private_hosted_zone_name,
'A',
private_ip
)
caller_response.append('Created A record in zone id: ' +
str(private_hosted_zone_id) + ' for hosted zone ' +
str(cname_prefix) + '.' +
str(private_hosted_zone_name) + ' with value: ' +
str(private_ip))
create_resource_record(
route53,
reverse_lookup_zone_id,
reversed_ip_address,
'in-addr.arpa',
'PTR',
cname
)
caller_response.append('Created PTR record in zone id: ' +
str(reverse_lookup_zone_id) +
' for hosted zone ' +
str(reversed_ip_address) +
'in-addr.arpa with value: ' +
str(cname))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
else:
LOGGER.debug("Deleting resource records: %s", lineno())
try:
if not tag_type == 'cname':
delete_resource_record(
route53,
private_hosted_zone_id,
private_host_name,
private_hosted_zone_name,
'A',
private_ip
)
caller_response.append('Deleted A record in zone id: ' +
str(private_hosted_zone_id) + ' for hosted zone ' +
str(private_host_name) + '.' +
str(private_hosted_zone_name) + ' with value: ' +
str(private_ip))
delete_resource_record(
route53,
reverse_lookup_zone_id,
reversed_ip_address,
'in-addr.arpa',
'PTR',
private_dns_name
)
caller_response.append('Deleted PTR record in zone id: ' +
str(reverse_lookup_zone_id) +
' for hosted zone ' +
str(reversed_ip_address) +
'in-addr.arpa with value: ' +
str(private_dns_name))
else:
delete_resource_record(
route53,
private_hosted_zone_id,
cname_prefix,
private_hosted_zone_name,
'A',
private_ip
)
caller_response.append('Deleted A record in zone id: ' +
str(private_hosted_zone_id) + ' for hosted zone ' +
str(cname_prefix) + '.' +
str(private_hosted_zone_name) + ' with value: ' +
str(private_ip))
delete_resource_record(
route53,
reverse_lookup_zone_id,
reversed_ip_address,
'in-addr.arpa',
'PTR',
cname
)
caller_response.append('Deleted PTR record in zone id: ' +
str(reverse_lookup_zone_id) +
' for hosted zone ' +
str(reversed_ip_address) +
'in-addr.arpa with value: ' +
str(cname))
except BaseException as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
else:
LOGGER.debug("No matching zone for %s", str(configuration) + lineno())
# Clean up DynamoDB after deleting records
if state != 'running':
delete_item_from_dynamodb_table(dynamodb_client, 'DDNS', instance_id)
caller_response.insert(0, 'Successfully removed recordsets')
return caller_response
caller_response.insert(0, 'Successfully created recordsets')
return caller_response
def determine_tag_type(tags):
"""
Determine tag type - CNAME or ZONE
:param tags:
:return:
"""
cname = -1
zone = -1
for item in tags:
LOGGER.debug("item: %s", str(item) + lineno())
if item['Key'].lower() == 'cname':
cname = 1
elif item['Key'].lower() == 'zone':
zone = 1
if cname < 0 and zone < 0:
return None
elif cname > 0 and zone < 0:
return 'cname'
elif cname < 0 and zone > 0:
return 'zone'
return 'invalid'
def get_cname_from_tags(tags):
"""
Get the cname prefix from tags
:param tags:
:return:
"""
try:
for tag in tags:
LOGGER.debug("tag: %s", str(tag))
if 'CNAME' in tag.get('Key', {}).lstrip().upper():
cname = tag.get('Value').lstrip().lower()
return cname
return None
except:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(sys.exc_info()[0]) + lineno())
def get_instances(client, instance_id):
"""
Get ec2 instance information
:return:
"""
try:
return client.describe_instances(InstanceIds=[instance_id])
except ClientError as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
def list_hosted_zones(client):
"""
Get route53 hosted zones
:param client:
:return:
"""
try:
return client.list_hosted_zones()
except ClientError as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
def list_tables(client):
"""
List the dynamodb tables
:param client:
:return:
"""
try:
return client.list_tables()
except ClientError as err:
publish_to_sns(SNS_CLIENT, ACCOUNT, REGION, "Unexpected error:" +
str(err) + lineno())
def delete_item_from_dynamodb_table(client, table, instance_id):
"""
Delete the item from dynamodb table