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Editing: query_specific.py
#!/usr/bin/env python3 # Two ways of querying a specific nameserver. import dns.message import dns.rdataclass import dns.rdatatype import dns.query # This way is just like nslookup/dig: qname = dns.name.from_text("amazon.com") q = dns.message.make_query(qname, dns.rdatatype.NS) print("The query is:") print(q) print("") r = dns.query.udp(q, "8.8.8.8") print("The response is:") print(r) print("") print("The nameservers are:") ns_rrset = r.find_rrset(r.answer, qname, dns.rdataclass.IN, dns.rdatatype.NS) for rr in ns_rrset: print(rr.target) print("") print("") # A higher-level way: import dns.resolver answer = dns.resolver.resolve_at("8.8.8.8", "amazon.com", "NS") print("The nameservers are:") for rr in answer: print(rr.target) print("") print("") # If you're going to make a bunch of queries to the server, make the resolver once # and then use it multiple times: res = dns.resolver.make_resolver_at("dns.google") answer = res.resolve("amazon.com", "NS") print("The amazon.com nameservers are:") for rr in answer: print(rr.target) answer = res.resolve("google.com", "NS") print("The google.com nameservers are:") for rr in answer: print(rr.target) print("") print("") # Sending a query with the all flags set to 0. This is the easiest way # to make a query with the RD flag off. # # This sends a query with RD=0 for the root SOA RRset to the IP address # for l.root-servers.net. q = dns.message.make_query(".", dns.rdatatype.SOA, flags=0) r = dns.query.udp(q, "199.7.83.42") print("\nThe flags in the response are {}".format(dns.flags.to_text(r.flags))) print('The SOA in the response is "{}"'.format((r.answer)[0][0]))
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