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Diffstat (limited to 'external/unbound/libunbound/python/doc/examples/example1b.rst')
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1 files changed, 24 insertions, 20 deletions
diff --git a/external/unbound/libunbound/python/doc/examples/example1b.rst b/external/unbound/libunbound/python/doc/examples/example1b.rst index ea1e6f57d..1adae2cb1 100644 --- a/external/unbound/libunbound/python/doc/examples/example1b.rst +++ b/external/unbound/libunbound/python/doc/examples/example1b.rst @@ -1,33 +1,37 @@ .. _example_reverse_lookup: -============================== Reverse DNS lookup -============================== +================== -Reverse DNS lookup involves determining the hostname associated with a given IP address. +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. +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.`` + +Source code +----------- :: - #!/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:: + #!/usr/bin/python + import unbound - def reverse(domain): - return '.'.join([a for a in domain.split(".")][::-1]) + 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 the +:meth:`unbound.reverse` function which reverses the hostname components. +This function is defined as follows:: + def reverse(domain): + return '.'.join([a for a in domain.split(".")][::-1]) |