Wireguard DDNS Updater

wireguard-update.py

import re
import subprocess
import socket
import traceback
DEBUG = False
WG = "wg0"
DDNS = "ddnshost.tld"
try:
    subprocess.run(["wg-quick", "save", f'{WG}'])
    config = open(f'/etc/wireguard/{WG}.conf', "r").read()
    old_ip = None
    for line in config.split("\n"):
        if not line.startswith("Endpoint"):
            continue
        ip_addr_regex = r'\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b'
        old_ip = re.findall(ip_addr_regex, line)[0]

    n_ip = socket.gethostbyname(DDNS)
    if (old_ip is not None and n_ip != old_ip) or DEBUG:
        subprocess.run(["wg-quick", "down", f'{WG}'])
        nconfig = open(f'/etc/wireguard/{WG}.conf', "w").write(config.replace(old_ip, n_ip))
        subprocess.run(["wg-quick", "up", f'{WG}'])
except Exception:
    traceback.print_exc()