DNS/実装/python/dnslib/example/jp_queryについて、ここに記述してください。

{{{#!python
# -*- coding: utf-8 -*-

"""
    DNS Client - DiG-like CLI utility.

    Usage: python -m dnslib.client [options|--help]

"""
from __future__ import print_function

#import binascii,code,pprint,sys

from dnslib.dns import DNSRecord,DNSHeader,DNSQuestion,DNSError,QTYPE,EDNS0
from dnslib.digparser import DigParser

if __name__ == '__main__':

    # import sys,time
    try:
        domain = 'qmail.jp'
        q = DNSRecord(q=DNSQuestion(domain, getattr(QTYPE,'NS')))
        address= '203.119.1.1'   # a.dns.jp

        a_pkt = q.send(address, 53, tcp=False)
        a = DNSRecord.parse(a_pkt)
        if a.header.tc :        # Truncated - retry in TCP mode
            a_pkt = q.send(address,port,tcp=True)
        a = DNSRecord.parse(a_pkt)
        
        # NXDOMAIN  rcode
        if a.header.rcode != 0 : # ['NOERROR', 'NXDOMAIN', 'SERVFAIL', 'REFUSED']:
           print (domain, a.header.rcode)
    #   print(";; Got answer:"); print(a.toZone())
        else:
          for r in a.auth:
            print (domain, '@'+str(r.rdata)[ :-1])
          print()

    except DNSError as e:
        p.error(e)

#The default text representation of the DNSRecord is in zone file format:

}}}