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ddns.py
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ddns.py
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'''
Dynamic DNS service for Vultr
By Andy Smith
https://ajsmith.us/
https://github.com/andyjsmith/Vultr-Dynamic-DNS
'''
import json, requests
# Import the values from the configuration file
with open("config.json") as config_file:
config = json.load(config_file) # Convert JSON to Python
domain = config["domain"]
api_key = config["api_key"]
dynamic_records = config["dynamic_records"]
# Get the public IP of the server
ip = requests.get("https://ip.42.pl/raw").text
# Get the list of DNS records from Vultr to translate the record name to recordid
raw_records = json.loads(requests.get("https://api.vultr.com/v1/dns/records?domain=" + domain, headers={"API-Key": api_key}).text)
# Filter out other records besides A records
records = []
for record in raw_records:
if record["type"] == "A":
records.append(record)
# Make a new array of the IDs from the records in the config file
records_to_change = []
for record in records:
if record["name"] in dynamic_records:
records_to_change.append(record)
# Cancel if no records from Vultr match the config file
if len(records_to_change) == 0:
print("Configuration error, no records to change.")
quit()
# Check if the IP address actually differs from any of the records
needsUpdated = False
for record in records_to_change:
if record["data"] != ip:
needsUpdated = True
# Cancel if the IP has not changed
if not needsUpdated:
print("IP address has not changed. No records have been updated.")
quit()
print("IP has changed since last checking.")
print("Old IP on Vultr: " + records_to_change[0]["data"] + ", current server IP: " + ip)
# Update the records in Vultr with the new IP address
for record in records_to_change:
payload = {"domain": domain, "RECORDID": record["RECORDID"], "data": ip}
response = requests.post("https://api.vultr.com/v1/dns/update_record", data = payload, headers={"API-Key": api_key})
name = record["name"]
if name == "":
name = "@"
print("Changed " + name + " (" + str(record["RECORDID"]) + ") to " + ip + " in " + domain)