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#!/usr/bin/env python3
myip_url = "https://YOUR_IP_FETCH_URL"
dyndns_url = "https://YOUR_DYNDNS_UPDATE_URL"
dyndns_domain = "EXAMPLE.COM"
dyndns_user = "USER"
dyndns_pw = "PASSWORD"
v6netlen = 64
import subprocess
import ipaddress
def wget(url, v4=None):
args = ["wget", ]
if v4 is not None:
args.append("-4" if v4 else "-6")
args.extend(["--quiet", "-O", "-", url])
print(" ".join(args))
p = subprocess.Popen(args, stdout=subprocess.PIPE)
out, err = p.communicate()
if p.returncode != 0 or not out:
raise Exception("wget failed.")
return out.decode("UTF-8")
def getfield(raw, name):
for line in raw.splitlines():
if line.startswith(name + "="):
return line[len(name) + 1 : ]
return ""
raw_v4 = wget(myip_url, v4=True)
raw_v6 = wget(myip_url, v4=False)
ipv4 = getfield(raw_v4, "REMOTE_ADDR")
ipv6 = getfield(raw_v6, "REMOTE_ADDR")
if not ipv4 and not ipv6:
raise Exception("Got neither v4 nor v6 address.")
dualstack = "1" if ipv4 and ipv6 else "0"
if ipv6:
adr = int(ipaddress.ip_address(ipv6))
msk = ((1 << v6netlen) - 1) << (128 - v6netlen)
ipv6pfx = f"{ipaddress.ip_address(adr & msk)}/{v6netlen}"
else:
ipv6pfx = ""
r = wget(f"{dyndns_url}?"
f"domain={dyndns_domain}&"
f"user={dyndns_user}&"
f"pw={dyndns_pw}&"
f"ip4={ipv4}&"
f"ip6={ipv6}&"
f"ip6pfx={ipv6pfx}&"
f"dualstack={dualstack}")
print(f"result: {r.strip()}")
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