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added unbound to external deps

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Riccardo Spagni 2014-10-05 23:44:31 +02:00
parent 732493c5cb
commit 9ef094b356
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33
external/unbound/libunbound/python/doc/examples/example1b.rst vendored Normal file
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.. _example_reverse_lookup:
==============================
Reverse DNS lookup
==============================
Reverse DNS lookup involves determining the hostname associated with a given IP address.
This example shows how reverse lookup can be done using unbound module.
For the reverse DNS records, the special domain in-addr.arpa is reserved.
For example, a host name for the IP address 74.125.43.147 can be obtained by issuing a DNS query for the PTR record for address 147.43.125.74.in-addr.arpa.
::
#!/usr/bin/python
import unbound
ctx = unbound.ub_ctx()
ctx.resolvconf("/etc/resolv.conf")
status, result = ctx.resolve(unbound.reverse("74.125.43.147") + ".in-addr.arpa.", unbound.RR_TYPE_PTR, unbound.RR_CLASS_IN)
if status == 0 and result.havedata:
print "Result.data:", result.data.domain_list
elif status != 0:
print "Resolve error:", unbound.ub_strerror(status)
In order to simplify the python code, unbound module contains function which reverses the hostname components.
This function is defined as follows::
def reverse(domain):
return '.'.join([a for a in domain.split(".")][::-1])