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