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pj 2021-02-27 00:10:11 +01:00
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
import json
import ovh
import sys
import requests, time
'''
API credentials
can be provided in variety of ways:
(see https://github.com/ovh/python-ovh#configuration)
-explicitly here :
'''
#client = ovh.Client(
# endpoint = "ovh-eu",
# application_key = "XXXXXXXXXXXXXXXX",
# application_secret = "YYYYYYYYYYYYYYYY",
# consumer_key = "ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ"
# )
'''
-or in the ENVIRONMENT
-or in a ovh.conf file
in which cases we can call with no argument (the ovh module gets the credentials on its own):
'''
client = ovh.Client()
default_ttl = 600 # seconds
# ttl = how long will a DNS server cache the value before checking it at the Registrar. Longer value yields faster name resolution most of the time, but less frequent updates
# list of hosts (=subdomain.domain.tld) to update, each a dictionnary with at least "domain" and "subdomain" defined
hosts = [
{
"domain": "mydomain.tld", # Required
"subdomain": "www", # Required. Explicit subdomain or empty string "" (for @) or "*" for wildcard
#"ipv6": any_value_except_False # Optional : maintain corresponding record, when possible
"ipv4": False, #explicitly disable modifiying ipv4 (A) records, even if public IPV4 exists (a possibly erroneous record would be left as-is)
#"ttl": 60 # optional : if 'ttl' in specified in host, overrides the global default value
},
{
"domain": "otherdomain.tld",
"subdomain": ""
# 'ipv4' and 'ipv6' are not listed : automatically maintain any/both records, according to availability
}
]
checkDNS_interval_hrs = 12.1 # when the saved IP addresses are old, check the DNS record, even if the addresses did not change
#save last known address in local file.
current_ip_file = "/tmp/current_ip.json"
def get_current_ip(v = 4):
url = 'https://api6.ipify.org' if v == 6 else 'https://api.ipify.org'
try :
r = requests.get(url, timeout=5.0)
except requests.exceptions.RequestException as e:
print("failed getting ipv{} address because {} occurred".format(v, str(e)))
return False
return r.text if r.status_code == requests.codes.ok else False
def update_record(domain, subdomain, new_ip, _ttl = 600):
"""
Update the (A or AAAA) record with the provided IP
"""
typ = 'AAAA' if ":" in new_ip else 'A'
print("checking record {} for {}.{}".format(typ,subdomain,domain))
path = "/domain/zone/{}/record".format(domain)
result = client.get(path,
fieldType = typ,
subDomain = subdomain
)
if len(result) != 1:
print("### creating NEW record {} for {}.{}".format(typ,subdomain,domain))
result = client.post(path,
fieldType = typ,
subDomain = subdomain,
target = new_ip,
ttl = _ttl
)
client.post('/domain/zone/{}/refresh'.format(domain))
result = client.get(path,
fieldType=typ,
subDomain=subdomain
)
record_id = result[0]
else :
# record exists
record_id = result[0]
path = "/domain/zone/{}/record/{}".format(domain,record_id)
result = client.get(path)
oldip = result['target']
print('record exists, with ip :',oldip)
if oldip == new_ip :
print('nothing to do')
return
else :
print('updating to ', new_ip)
result = client.put(path,
subDomain = subdomain,
target = new_ip,
ttl = _ttl
)
client.post('/domain/zone/{}/refresh'.format(domain))
#checking changes
result = client.get("/domain/zone/{}/record/{}".format(domain,record_id))
if new_ip != result['target'] :
raise Exception("Error updating {}.{} with {}".format(subdomain,domain,new_ip))
def delete_record(domain, subdomain, typ):
"""
if it exists, delete an A or AAAA record
(because the corresponding IP is not available)
"""
print("checking record {} for {}.{}".format(typ,subdomain,domain))
result = client.get("/domain/zone/{}/record".format(domain),
fieldType = typ,
subDomain = subdomain
)
if len(result) == 1:
# record exists, delete it
record_id = result[0]
print("### deleting record {} for {}.{}".format(typ,subdomain,domain))
client.delete("/domain/zone/{}/record/{}".format(domain,record_id))
client.post('/domain/zone/{}/refresh'.format(domain))
#reload saved values
try:
with open(current_ip_file, 'r') as f:
old_time, old_ipv4, old_ipv6 = json.load(f)
except IOError:
print("No old ips recorded")
current_ipv4 = get_current_ip(4)
current_ipv6 = get_current_ip(6)
print('current ips: {} ; {}'.format(current_ipv4, current_ipv6))
if current_ipv4 or current_ipv6 : #we could get at least one address
try :
need_update = (old_ipv4 != current_ipv4) or (old_ipv6 != current_ipv6) or ((old_time - time.time()) > 3600.0 * checkDNS_interval_hrs)
except : #old values do not exist, we must check the records
need_update = True
if need_update :
try :
for host in hosts :
domain = host["domain"]
subdomain = host ["subdomain"]
if ('ipv4' not in host) or (host['ipv4'] != False) :
if current_ipv4 :
ttl = default_ttl if ('ttl' not in host) else host['ttl']
update_record(domain, subdomain, current_ipv4, _ttl = ttl)
else :
delete_record(domain, subdomain, 'A')
else :
print("Not touching A record for {}.{}, as instructed".format(subdomain, domain))
if ('ipv6' not in host) or (host['ipv6'] != False) :
if current_ipv6 :
ttl = default_ttl if ('ttl' not in host) else host['ttl']
update_record(domain, subdomain, current_ipv6, _ttl = ttl)
else :
delete_record(domain, subdomain, 'AAAA')
else :
print("Not touching AAAA record for {}.{}, as instructed".format(subdomain, domain))
print ("changed , saving new ips: ",current_ipv4, " ", current_ipv6)
#all hosts records have been updated without errors, save current addresses
with open(current_ip_file, 'w') as f:
json.dump([time.time(), current_ipv4, current_ipv6],f)
except Exception as e: #some error occured,
print("error updating records :", str(e))
pass
else :
print("do nothing")
else :
print("cannot get IPs. Network down? Doing nothing")