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#
#
"""
@author: <sylvain.herledan@hrafnagud.info>
@date: 2021-04-10
"""
import os
import sys
import json
import socket
import typing
import logging
import argparse
import http.client
logger = logging.getLogger(__name__)
def get_ip_from_ifconfig_me(
) -> typing.Tuple[bool, typing.Optional[bytes]]:
""""""
conn = http.client.HTTPSConnection('ifconfig.me') # nosec
try:
conn.request('GET', '/')
r = conn.getresponse()
data = r.read()
r.close()
except socket.gaierror:
logger.error('ifconfig.me unavailable')
return False, None
except socket.timeout:
logger.error('ifconfig.me timeout')
return False, None
finally:
conn.close()
return True, data
def get_ip_from_ipecho_net(
) -> typing.Tuple[bool, typing.Optional[bytes]]:
""""""
conn = http.client.HTTPSConnection('ipecho.net') # nosec
try:
conn.request('GET', '/plain')
r = conn.getresponse()
data = r.read()
r.close()
except socket.gaierror:
logger.error('ipecho.net unavailable')
return False, None
except socket.timeout:
logger.error('ipecho.net timeout')
return False, None
finally:
conn.close()
return True, data
def get_ip_from_ipinfo_io(
) -> typing.Tuple[bool, typing.Optional[bytes]]:
""""""
conn = http.client.HTTPSConnection('ipinfo.io') # nosec
try:
conn.request('GET', '/ip')
r = conn.getresponse()
data = r.read()
r.close()
except socket.gaierror:
logger.error('ipinfo.io unavailable')
return False, None
except socket.timeout:
logger.error('ipinfo.io timeout')
return False, None
finally:
conn.close()
return True, data
def update_record(api_key: str,
fqdn: str,
r_name: str,
r_type: str,
ip_address: str
) -> typing.Tuple[bool, typing.Optional[bytes]]:
""""""
headers = {'Authorization': f'Apikey {api_key}'}
_payload = {'rrset_values': [ip_address, ],
'rrset_ttl': 300}
payload = json.dumps(_payload)
ok = False
conn = http.client.HTTPSConnection('api.gandi.net') # nosec
try:
conn.request('PUT',
f'/v5/livedns/domains/{fqdn}/records/{r_name}/{r_type}',
headers=headers, body=payload)
r = conn.getresponse()
ok = (201 == r.status)
data = r.read()
r.close()
except socket.gaierror:
logger.error('api.gandi.net unavailable')
return False, None
except socket.timeout:
logger.error('api.gandi.net timeout')
return False, None
finally:
conn.close()
return ok, data
if '__main__' == __name__:
# Setup logging
main_logger = logging.getLogger()
handler = logging.StreamHandler()
handler.setLevel(logging.DEBUG)
main_logger.addHandler(handler)
main_logger.setLevel(logging.DEBUG)
parser = argparse.ArgumentParser()
parser.add_argument('config_path', type=str)
args = parser.parse_args()
cfg_path = args.config_path
if not os.path.exists(cfg_path):
logger.error(f'"{cfg_path}" configuration file not found')
sys.exit(1)
# Get public IP address from various sources
ip_addresses = []
ok, ip1 = get_ip_from_ifconfig_me()
if (ok is True) and (ip1 is not None):
ip_addresses.append(ip1.decode('utf-8'))
ok, ip2 = get_ip_from_ipecho_net()
if (ok is True) and (ip2 is not None):
ip_addresses.append(ip2.decode('utf-8'))
ok, ip3 = get_ip_from_ipinfo_io()
if (ok is True) and (ip3 is not None):
ip_addresses.append(ip3.decode('utf-8'))
if 0 >= len(ip_addresses):
logger.error('Could not get public IP address from any source')
sys.exit(1)
# Make sure the collected addresses match
ip_checks = [_ for _ in ip_addresses if _ == ip_addresses[0]]
if len(ip_checks) < len(ip_addresses):
logger.error('Public IP addresses do not match')
sys.exit(1)
ip = ip_addresses[0]
# Read configuration
cfg = None
with open(cfg_path, 'r') as f:
try:
cfg = json.load(f)
except ValueError:
logger.error(f'{cfg_path} is not a valid JSON file')
if cfg is None:
logger.error('Impossible to load configuration')
sys.exit(1)
api_key = cfg.get('api_key', None)
fqdn = cfg.get('fqdn', None)
record_name = cfg.get('record_name', None)
history_path = cfg.get('history_path', None)
if None in (api_key, fqdn, record_name, history_path):
logger.error('Configuration is missing a required field')
sys.exit(1)
old_ip = None
if os.path.exists(history_path):
with open(history_path, 'r') as f:
old_ip = f.read()
if ip == old_ip:
logger.info('IP address has not changed since last DNS record update.')
sys.exit(0)
# Update DNS record
ok, result = update_record(api_key, fqdn, record_name, 'A', ip)
if ok is False:
logger.error('Failed to update DNS record using api.gandi.net')
logger.debug(result)
sys.exit(1)
with open(history_path, 'w') as f:
f.write(ip)
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