forge/ovh-dns-updater
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fix & cleanup

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This commit is contained in:
pj 2021-02-27 13:11:26 +01:00
parent f381cc46d8
commit b012a6b7dd
1 changed files with 19 additions and 19 deletions
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38
ovh-dns-updater.py
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@ -22,23 +22,23 @@ can be provided in variety of ways:
'''
-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):
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
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
records_changed = 0
records_changed = 0
# 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
@ -46,30 +46,30 @@ hosts = [
]
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"
#save last known address in local file.
current_ip_file = "/tmp/current_ip.json"
def send_email(msg, sender = 'no_reply@mydomain.com', receiver = 'admin@mydomain.com')
def send_email(msg, sender = 'no_reply@mydomain.com', receiver = 'admin@mydomain.com') :
import smtplib
try :
smtpObj = smtplib.SMTP('localhost')
smtpObj.sendmail(sender, receiver,
"From: {}\nTo: {}\nSubject: DNS Update problem\n\n{}\n".format(sender, receiver, msg)
)
)
except smtplib.SMTPException:
print( timestamp()," : Error unable to send email")
def get_current_ip(v = 4):
url = 'https://api6.ipify.org' if v == 6 else 'https://api.ipify.org'
try :
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 timestamp() :
return time.asctime( time.localtime(time.time()) )
@ -112,9 +112,9 @@ def update_record(domain, subdomain, new_ip, _ttl = 600):
return
else :
#print('updating to ', new_ip)
result = client.put(path,
subDomain = subdomain,
target = new_ip,
result = client.put(path,
subDomain = subdomain,
target = new_ip,
ttl = _ttl
)
client.post('/domain/zone/{}/refresh'.format(domain))
@ -124,11 +124,11 @@ def update_record(domain, subdomain, new_ip, _ttl = 600):
if new_ip != result['target'] :
records_changed -= 1
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
if it exists, delete an A or AAAA record
(because the corresponding IP is not available)
"""
#print("checking record {} for {}.{}".format(typ,subdomain,domain))
@ -161,7 +161,7 @@ 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
need_update = True
if need_update :
try :
for host in hosts :
@ -186,7 +186,7 @@ if current_ipv4 or current_ipv6 : #we could get at least one address
#print("Not touching AAAA record for {}.{}, as instructed".format(subdomain, domain))
pass
#all hosts records have been updated without errors, log change and save current addresses
print("{} : new addresses {} ; {} -- {} records updates".format(timestamp(), current_ipv4, current_ipv6, records_changed)
print("{} : new addresses {} ; {} -- {} records updates".format(timestamp(), current_ipv4, current_ipv6, records_changed))
with open(current_ip_file, 'w') as f:
json.dump([time.time(), current_ipv4, current_ipv6],f)
except Exception as e: #some error occured (API down, keys expired...?),