On Wed, Sep 30, 2009 at 08:31, Rainer Gerhards <[email protected]> wrote: > After my bughunt looks almost completed, I have come back to implementing the > name lookup cache. However, I just found out that obtaining the expiration > period of the name lookup seems not to be covered by the "usual" socket > calls. Or did I just miss them?
Unfortunately not - most resolver libraries provide only what the programmer usually wants - the symbolic (name) or numeric (IP) result of a query. I've not looked carefully at APIs like res_query, though, and that might bring what you need. > Any advise, comments and hints regarding name caching and expiration would > deeply be appreciated. This was my greatest concern with doing *good* internal caching in rsyslog - you're almost guaranteed to use and/or implement a large chunk of proper resolver functionality. Depending on how readable you find Perl, the Net::DNS infrastructure may provide some good pointers on implementing custom resolution toolkits. The djbdns 'dnscache' program (and perhaps the djbdns client resolver library itself) could also be good pointers. _______________________________________________ rsyslog mailing list http://lists.adiscon.net/mailman/listinfo/rsyslog http://www.rsyslog.com
