print only important messages (for log file)
email on serious problem
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pj
parent
4aa3b5a841
commit
f381cc46d8
1 changed files with 50 additions and 23 deletions
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@ -28,7 +28,7 @@ client = ovh.Client()
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default_ttl = 600 # seconds
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# 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
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records_changed = 0
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# list of hosts (=subdomain.domain.tld) to update, each a dictionnary with at least "domain" and "subdomain" defined
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hosts = [
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{
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@ -50,22 +50,34 @@ checkDNS_interval_hrs = 12.1 # when the saved IP addresses are old, check the DN
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current_ip_file = "/tmp/current_ip.json"
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def send_email(msg, sender = 'no_reply@mydomain.com', receiver = 'admin@mydomain.com')
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import smtplib
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try :
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smtpObj = smtplib.SMTP('localhost')
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smtpObj.sendmail(sender, receiver,
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"From: {}\nTo: {}\nSubject: DNS Update problem\n\n{}\n".format(sender, receiver, msg)
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)
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except smtplib.SMTPException:
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print( timestamp()," : Error unable to send email")
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def get_current_ip(v = 4):
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url = 'https://api6.ipify.org' if v == 6 else 'https://api.ipify.org'
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try :
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r = requests.get(url, timeout=5.0)
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except requests.exceptions.RequestException as e:
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print("failed getting ipv{} address because {} occurred".format(v, str(e)))
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#print("failed getting ipv{} address because {} occurred".format(v, str(e)))
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return False
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return r.text if r.status_code == requests.codes.ok else False
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def timestamp() :
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return time.asctime( time.localtime(time.time()) )
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def update_record(domain, subdomain, new_ip, _ttl = 600):
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"""
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Update the (A or AAAA) record with the provided IP
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"""
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#Update the (A or AAAA) record with the provided IP
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typ = 'AAAA' if ":" in new_ip else 'A'
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print("checking record {} for {}.{}".format(typ,subdomain,domain))
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#print("checking record {} for {}.{}".format(typ,subdomain,domain))
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path = "/domain/zone/{}/record".format(domain)
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result = client.get(path,
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fieldType = typ,
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@ -73,7 +85,7 @@ def update_record(domain, subdomain, new_ip, _ttl = 600):
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)
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if len(result) != 1:
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print("### creating NEW record {} for {}.{}".format(typ,subdomain,domain))
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#creating NEW record
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result = client.post(path,
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fieldType = typ,
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subDomain = subdomain,
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@ -86,27 +98,31 @@ def update_record(domain, subdomain, new_ip, _ttl = 600):
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subDomain=subdomain
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)
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record_id = result[0]
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records_changed += 1
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print("{} : ### created new record {} for {}.{}".format(timestamp(),typ,subdomain,domain))
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else :
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# record exists
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record_id = result[0]
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path = "/domain/zone/{}/record/{}".format(domain,record_id)
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result = client.get(path)
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oldip = result['target']
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print('record exists, with ip :',oldip)
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#print('record exists, with ip :',oldip)
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if oldip == new_ip :
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print('nothing to do')
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#print('nothing to do')
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return
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else :
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print('updating to ', new_ip)
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#print('updating to ', new_ip)
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result = client.put(path,
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subDomain = subdomain,
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target = new_ip,
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ttl = _ttl
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)
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client.post('/domain/zone/{}/refresh'.format(domain))
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records_changed += 1
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#checking changes
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result = client.get("/domain/zone/{}/record/{}".format(domain,record_id))
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if new_ip != result['target'] :
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records_changed -= 1
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raise Exception("Error updating {}.{} with {}".format(subdomain,domain,new_ip))
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@ -115,7 +131,7 @@ def delete_record(domain, subdomain, typ):
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if it exists, delete an A or AAAA record
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(because the corresponding IP is not available)
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"""
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print("checking record {} for {}.{}".format(typ,subdomain,domain))
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#print("checking record {} for {}.{}".format(typ,subdomain,domain))
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result = client.get("/domain/zone/{}/record".format(domain),
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fieldType = typ,
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subDomain = subdomain
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@ -123,9 +139,10 @@ def delete_record(domain, subdomain, typ):
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if len(result) == 1:
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# record exists, delete it
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record_id = result[0]
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print("### deleting record {} for {}.{}".format(typ,subdomain,domain))
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print("{} : ### deleting record {} for {}.{}".format(timestamp(),typ,subdomain,domain))
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client.delete("/domain/zone/{}/record/{}".format(domain,record_id))
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client.post('/domain/zone/{}/refresh'.format(domain))
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records_changed += 1
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#reload saved values
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@ -133,11 +150,12 @@ try:
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with open(current_ip_file, 'r') as f:
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old_time, old_ipv4, old_ipv6 = json.load(f)
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except IOError:
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print("No old ips recorded")
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#print("No old ips recorded")
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pass
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current_ipv4 = get_current_ip(4)
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current_ipv6 = get_current_ip(6)
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print('current ips: {} ; {}'.format(current_ipv4, current_ipv6))
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#print('current ips: {} ; {}'.format(current_ipv4, current_ipv6))
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if current_ipv4 or current_ipv6 : #we could get at least one address
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try :
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@ -156,7 +174,8 @@ if current_ipv4 or current_ipv6 : #we could get at least one address
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else :
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delete_record(domain, subdomain, 'A')
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else :
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print("Not touching A record for {}.{}, as instructed".format(subdomain, domain))
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#print("Not touching A record for {}.{}, as instructed".format(subdomain, domain))
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pass
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if ('ipv6' not in host) or (host['ipv6'] != False) :
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if current_ipv6 :
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ttl = default_ttl if ('ttl' not in host) else host['ttl']
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@ -164,16 +183,24 @@ if current_ipv4 or current_ipv6 : #we could get at least one address
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else :
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delete_record(domain, subdomain, 'AAAA')
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else :
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print("Not touching AAAA record for {}.{}, as instructed".format(subdomain, domain))
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print ("changed , saving new ips: ",current_ipv4, " ", current_ipv6)
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#all hosts records have been updated without errors, save current addresses
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#print("Not touching AAAA record for {}.{}, as instructed".format(subdomain, domain))
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pass
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#all hosts records have been updated without errors, log change and save current addresses
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print("{} : new addresses {} ; {} -- {} records updates".format(timestamp(), current_ipv4, current_ipv6, records_changed)
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with open(current_ip_file, 'w') as f:
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json.dump([time.time(), current_ipv4, current_ipv6],f)
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except Exception as e: #some error occured,
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print("error updating records :", str(e))
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pass
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except Exception as e: #some error occured (API down, keys expired...?),
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msg = "{} : ### error {} while updating records!! {} records updated with new addresses {} ; {}".format(timestamp(), str(e), records_changed, current_ipv4, current_ipv6)
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print(msg)
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send_email(msg)
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# not saving new addresses, so that update is attempted again.
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else :
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print("do nothing")
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#print("nothing to do!")
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pass
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else :
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print("cannot get IPs. Network down? Doing nothing")
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msg = "{} : cannot get IPs. Network down? ipify.org down?".format(timestamp())
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print(msg)
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send_email(msg)
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