farrokhi/dnsdiag
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also ask NS from domain's own DNS server

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This commit is contained in:
Babak Farrokhi 2016-05-24 16:05:11 +04:30
parent 2609fdd758
commit 76a24b10f2
Signed by: farrokhi
GPG Key ID: 6B267AD85D632E9A
1 changed files with 16 additions and 33 deletions
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dnsdiag.py
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@ -73,7 +73,8 @@ class myResolver(dns.resolver.Resolver):
r = socket.getaddrinfo(n, port=None, family=self.default_af)[1][4][0]
except OSError:
print('Error: cannot resolve hostname:', n)
sys.exit(1)
# sys.exit(1)
return # todo: to be handled gracefully
else:
resolved_nameservers.append(r)
@ -116,7 +117,7 @@ class myResolver(dns.resolver.Resolver):
return []
def lookupNSRecords(self, hostname):
def lookupNS(self, hostname):
try:
answers = self.query(hostname, 'NS', tcp=self.use_tcp, af=self.default_af,
raise_on_no_answer=False)
@ -181,6 +182,7 @@ def main():
usage()
elif o in ("-v", "--verbose"):
verbose = True
quiet = False
elif o in ("-s", "--server"):
dnsserver = a
elif o in ("-p", "--port"):
@ -212,44 +214,25 @@ def main():
print('Error: cannot resolve hostname:', dnsserver)
sys.exit(1)
# Lookup from master parent
res = myResolver(nameservers=[default_parent], port=dst_port, af=address_family, use_tcp=use_tcp)
printHeader("Domain NS Records (from parent: %s)" % default_parent)
answers = res.lookupNSRecords(hostname)
answers = res.lookupNS(hostname)
for a in answers:
A = res.lookupA(a.target)
AAAA = res.lookupAAAA(a.target)
print("%-25s\t%s\t%s" % (a.target, '\t'.join(A), '\t'.join(AAAA)))
# Lookup from your DNS server
yourdns = str(a.target)
res = myResolver(nameservers=[yourdns], port=dst_port, af=address_family, use_tcp=use_tcp)
printHeader("Domain NS Records (from your DNS: %s)" % a.target)
answers = res.lookupNS(hostname)
for a in answers:
A = res.lookupA(a.target)
AAAA = res.lookupAAAA(a.target)
print("%-25s\t%s\t%s" % (a.target, '\t'.join(A), '\t'.join(AAAA)))
# try:
# answers = resolver.query(hostname, dnsrecord, source_port=src_port, source=src_ip, tcp=use_tcp, af=address_family,
# raise_on_no_answer=False)
# except dns.resolver.NoNameservers as e:
# if not quiet:
# print("No response to dns request")
# if verbose:
# print("error:", e)
# sys.exit(1)
# except dns.resolver.NXDOMAIN as e:
# if not quiet:
# print("Hostname does not exist")
# if verbose:
# print("Error:", e)
# sys.exit(1)
# except dns.resolver.Timeout:
# if not quiet:
# print("Request timeout")
# pass
# except dns.resolver.NoAnswer:
# if not quiet:
# print("No answer")
# pass
# else:
# if verbose:
# print(answers.rrset)
# print("flags:", dns.flags.to_text(answers.response.flags))
if __name__ == '__main__':
main()