## page was renamed from DNS/実装/python/dnslib/ゾーンサーバー/zone.py
DNS/実装/python/dnslib/ゾーンサーバー/zone.pyについて、ここに記述してください。


zone.txtにあるゾーンファイルを読み込んで、ちょっとした検査をする。
-- ToshinoriMaeno <<DateTime(2016-08-10T14:50:26+0900)>>

classを使って、ゾーンサーバで利用可能な形に書き換え中。

{{{#!python
#!/usr/bin/env python
from sets import Set

import dnslib
from dnslib import QTYPE, SOA, NS, A, AAAA, MX, CNAME
from dnslib import DNSRecord, DNSHeader, RR, RCODE

#---------------- read zone -----------------------
zone = {}  #Dict;  key is a domain name
          #value: Dict for rtype
               # value: RRSet
cuts = Set([])  # delegation point; Set

# ---- open zone data -------
zonetxt = open('zone.txt').read()
#print(zonetxt)

z = '' # zone name
for rr in RR.fromZone(zonetxt):
  name = str(rr.rname)
  if not(name in zone) :  #new name
     zone[name] = {}   # make empty node
  elif rr.rtype == QTYPE.CNAME :
     print 'CNAME error', zone[name], rr

  if QTYPE.CNAME in zone[name]: # CNAME exists
     print 'CNAME error', zone[name], rr
  if not(rr.rtype in zone[name]):  # new rtype -> rrset
     zone[name][rr.rtype] = Set([])  # empty query type
  zone[name][rr.rtype].add(rr)

  if rr.rtype == QTYPE.SOA :
    if z == '':
       z = name
       print 'SOA == ', z, zone[name]
    else :
      print 'SOA duplicate ', z, name

if len(z)==0 :
   print 'No zone found'
   exit

print '----------------'

zsuffix = '.'+ z
#----- remove out of zone name ------
for name in zone:
  if not (name== z or name.endswith(zsuffix)) : 
     delete(zone[name])
     print 'Out of zone record',
  print name, (zone[name])

rrs = zone[z]  # zone apex node
if QTYPE.SOA in rrs:
   soa_record = rrs[QTYPE.SOA].copy().pop()
   ns_record = rrs[QTYPE.NS]

print '---- zone apex record ----'
print 'zone name ', z
print zone[z]
print '-----'
print 'SOA = ',soa_record 
print 'NS = ', ns_record 

#  delegation list 
for name in zone:
  if name == z : continue
  if QTYPE.NS in zone[name]:
     cuts.add(name)
     print 'cut found: ', name
print 'cuts =', cuts

print '-------- Zone processed ---------'
}}}