最新のNGNのネットワークアドレスを取得するスクリプト

get_ngw_prefix.py

import ipaddress
import subprocess
import requests

DNS_SERVER = "2404:1a8:7f01:b::3" # NTT西は所定のDNSサーバー
DOMAIN = "route-info.flets-east.jp" # NTT西管内は route-info.flets-west.jp
PORT = 49881

# dig IPv6 addr
dig_res = subprocess.run(["dig",f"@{DNS_SERVER}",DOMAIN,"AAAA","+short"],stdout=subprocess.PIPE)
ipv6_addr = dig_res.stdout.decode("utf8").rstrip("\n")

# GET route info
headers = {"Host": f"{DOMAIN}:49881","Accept":"*/*","Accept-Charset":"utf-8","Connection":"close"}
get_res = requests.get(f"http://[{ipv6_addr}]:{PORT}/v6/route-info",headers=headers)

# formatting 
raw_arr = get_res.content.decode("utf-8").replace("\r\n",",").replace(" ", ",").split(",")

# ip networkにならないものを消す
res_arr = []
for element in raw_arr:
    try:
        _net = ipaddress.ip_network(element)
        res_arr.append(element)
    except:
        continue

print(res_arr)