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diff --git a/external/unbound/libunbound/python/doc/examples/example1b.rst b/external/unbound/libunbound/python/doc/examples/example1b.rst new file mode 100644 index 000000000..ea1e6f57d --- /dev/null +++ b/external/unbound/libunbound/python/doc/examples/example1b.rst @@ -0,0 +1,33 @@ +.. _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]) + + |