#!/usr/bin/env python3
# txtrecord_decode.py output.png logo.example.com
import dns.resolver # pip3 install dnspython
import base64
import sys
q = dns.resolver.query(sys.argv[2],"TXT").response.answer[0]
out = b""
for line in sorted(_.strings[0] for _ in q):
    if chr(line[0]) == "{":
        try:
            out += line.split(b"}",1)[1]
        except IndexError:
            pass
with open(sys.argv[1],"wb") as f:
    f.write(base64.b64decode(out))