On 2012-05-18 23:59, Marc Perkel wrote:
Here's a possible example. There are servers out there that return country codes of IP addresses. But what about a country code for a host name? You would have to do an IP lookup on the host and then use the IP to get a country code.
I don't see this as a problem, since it actually spreads the load of the loookup to different DNS servers and proxies and the client.
Considering lookups done by an MTA or anti-spam system, the system is likely to lookup the IP address of any "interresting" hostname anyway so the result of that lookup should be in the cache allready except for the first lookup.
So - is there source code for something like this
Obviously, yes. There are open source DNS servers that can do recursion when answering DNS queries. The source code for such a server has the building blocks you need for your idea.
> or a DNS server with a scripting language? What about a DNS server written in a scripting language? <http://search.cpan.org/~olaf/Net-DNS-0.68/lib/Net/DNS/Nameserver.pm> <http://search.cpan.org/~bbb/Net-DNSServer-0.11/lib/Net/DNSServer.pm> There's likely to be at least one name server written in Python as well. Regards /Jonas -- Jonas Eckerman http://www.truls.org/ -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
