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dynDNS.py
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dynDNS.py
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import socket
import os
import argparse
import requests
from dotenv import load_dotenv
from hetznerAPI import update_hetzner_dns_record, print_hetzner_dns_record
# File keeping track of last IP
ip_file = None
# Method that resolves domain to IP
def resolve_ip_address(domain):
"""Resolve IP address for a given domain."""
try:
ip = socket.gethostbyname(domain)
except socket.gaierror as e:
print(f"Error resolving IP for {domain}: {e}")
return None
return ip
# Method that determined your public IP from the current network
def get_ip_from_local():
"""Retrieve public IP from the current network."""
try:
response = requests.get('https://api.ipify.org')
if response.status_code == 200:
return response.text
else:
print("Failed to retrieve public IP:", response.status_code)
return None
except requests.RequestException as e:
print("Error:", e)
return None
# Main method
if __name__ == "__main__":
# Create args parser
parser = argparse.ArgumentParser(prog='dynDNS.py')
parser.add_argument('-p', '--dnsprint', action='store_true', help='query and print all of your Hetzner DNS records')
parser.add_argument('-l', '--local', action='store_true', help='retrieve your IP address from the current network')
args = parser.parse_args()
load_dotenv()
hetzner_api_token = os.getenv('HETZNER_API_TOKEN')
# Check for API key
if not hetzner_api_token:
print("No API key. Please follow the README for instructions.")
# Print Hetzner DNS records
elif args.dnsprint:
print_hetzner_dns_record(hetzner_api_token)
# Update Hetzner DNS record
else:
domain = os.getenv('DOMAIN')
dns_record_id = os.getenv('DNS_RECORD_ID')
dns_record_zone_id = os.getenv('DNS_RECORD_ZONE_ID')
ip_file = os.getenv('IP_FILE')
# Make sure the file exists
if not os.path.exists(ip_file):
with open(ip_file, 'w+') as f:
pass
# Get IP address depending on the flag
ip_address = get_ip_from_local() if args.local else resolve_ip_address(domain)
if ip_address:
# Update the DNS record
response = update_hetzner_dns_record(hetzner_api_token, dns_record_id, ip_address, dns_record_zone_id)
# If successfull, print and update file. If not, print error
if response:
print("DNS record updated successfully:", response)
with open(ip_file, 'r') as f:
lines = f.readlines()
if len(lines) > 0:
if ip_address in lines[0]:
print(f'IP did not change. Still {ip_address}')
else:
print(f'IP changed to {ip_address}')
with open (ip_file, 'w') as f:
f.writelines([ip_address])
else:
print("Failed to update DNS record.")