On Tue, Sep 07, 2021 at 09:44:43AM +0200,
Stephane Bortzmeyer <[email protected]> wrote
a message of 34 lines which said:
> I'm not aware of a tool (free software or not) which does it. Some
> programming will be required.
Attached is an example program. Free software licence, whatever you
prefer. Requires Python and the dnspython library. For many many
requests, it would probably be better to parallelize it.
% ./list-auth.py bortzmeyer.org www.bortzmeyer.org fr toto.tata.trucmachin.fx
3.3.1.0.6.8.0.0.0.0.0.0.0.0.0.0.7.0.0.0.8.4.3.1.c.7.6.0.1.0.0.2.ip6.arpa
lists.isc.org tristatelogic.com
bortzmeyer.org.: ns3.absolight.net. ns2.bortzmeyer.org. ns4.bortzmeyer.org.
ns.eu.org. ns2.absolight.net. ns1.bortzmeyer.org.
www.bortzmeyer.org.: ns2.absolight.net. ns1.bortzmeyer.org. ns3.absolight.net.
ns2.bortzmeyer.org. ns4.bortzmeyer.org. ns.eu.org.
fr.: d.nic.fr. e.ext.nic.fr. f.ext.nic.fr. g.ext.nic.fr.
toto.tata.trucmachin.fx.: DOES NOT EXIST
3.3.1.0.6.8.0.0.0.0.0.0.0.0.0.0.7.0.0.0.8.4.3.1.c.7.6.0.1.0.0.2.ip6.arpa.:
ns3.nic.fr. ns1.nic.fr. ns2.nic.fr.
lists.isc.org.: ns.isc.afilias-nst.info. ns1.isc.org. ns3.isc.org. ns2.isc.org.
tristatelogic.com.: t1.zoneedit.com. t2.zoneedit.com.
#!/usr/bin/env python3
import dns.message
import dns.query
import dns.resolver
import sys
resolver = None # Use the default resolver. Set to an IP address otherwise.
def parent(name):
return dns.name.Name(name[1:])
def get_ns(name):
message = dns.message.make_query(name, dns.rdatatype.NS, use_edns=True,
want_dnssec=False)
response = dns.query.udp(message, resolver)
if response.rcode() == dns.rcode.NXDOMAIN:
return "DOES NOT EXIST"
elif response.rcode() != dns.rcode.NOERROR:
return "SOMETHING WENT WRONG"
if len(response.answer) > 0:
result = ""
for rrset in response.answer:
for record in rrset:
if record.rdtype == dns.rdatatype.NS:
result += "%s " % record.target
return result
else:
return get_ns(parent(name))
if resolver is None:
resolver = dns.resolver.Resolver().nameservers[0]
print("Using the resolver %s" % resolver)
print()
for arg in sys.argv[1:]:
name = dns.name.from_text(arg)
print("%s: " % name, end="")
print(get_ns(name))
print()
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