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#!/usr/bin/python3
import sys ; sys.path.insert(0, '..')
import DNS
def Error(mesg):
import sys
print(sys.argv[0],"ERROR:")
print(mesg)
sys.exit(1)
def main():
import sys
if len(sys.argv) != 2:
Error("usage: %s somedomain.com"%sys.argv[0])
domain = sys.argv[1]
nslist = GetNS(domain)
print("According to the primary, the following are nameservers for this domain")
for ns in nslist:
print(" ",ns)
CheckNS(ns,domain)
def GetNS(domain):
import DNS
# hm. this might fail if a server is off the air.
r = DNS.Request(domain,qtype='SOA').req()
if r.header['status'] != 'NOERROR':
Error("received status of %s when attempting to look up SOA for domain"%
(r.header['status']))
if r.header['status'] == 'NXDOMAIN':
print("SOA request was NXDOMAIN")
primary = ''
else:
if r.answers:
primary,email,serial,refresh,retry,expire,minimum = r.answers[0]['data']
print("Primary nameserver for domain %s is: %s"%(domain,primary))
else:
print("No answer to SOA query")
primary = ''
r = DNS.Request(domain,qtype='NS',server=primary,aa=1).req()
if r.header['status'] != 'NOERROR':
Error("received status of %s when attempting to query %s for NSs"%
(r.header['status']))
if r.header['aa'] != 1 and primary is not '':
Error("primary NS %s doesn't believe that it's authoritative!"% primary)
nslist = [x['data'] for x in r.answers]
print("Full list of nameservers for domain %s is: %s"%(domain,nslist))
return nslist
def CheckNS(nameserver,domain):
r = DNS.Request(domain,qtype='SOA',server=nameserver,aa=1).req()
if r.header['status'] != 'NOERROR':
Error("received status of %s when attempting to query %s for NS"%
(r.header['status']))
if r.header['aa'] != 1:
Error("NS %s doesn't believe that it's authoritative!"% nameserver)
primary,email,serial,refresh,retry,expire,minimum = r.answers[0]['data']
print(" NS has serial",serial[1])
if __name__ == "__main__":
main()
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