2007/10/26, Stefan Leuenberger <[EMAIL PROTECTED]>:
> Any hint where to implement blacklisting?
> I'd thougth that the following code does this job (take the next result
> and free the one that did not work...):
Well, the problem is that it does not remember that which destination
did not work next time. The blacklisting would put the destination
that timed out into a container. The next transaction would look up
them and avoid blacklisted destination.
So what is needed to implement blacklisting? A hash table or a search
tree where to put bad destinations (a su_addrinfo_t or tp_name_t
perhaps) and a timestamp when they timed out last time. When a new
transaction would be resolved, the results would be checked against
the blacklisted destinations before using them in
outgoing_query_results() and outgoing_resolve_next(). Perhaps also a
setting to indicate how long time a blacklisted destination stay that
way and when they become graylisted (like, stack would use them as a
last resort even if they timed out.
--Pekka
> /** Resolve next destination. */
> static int
> outgoing_resolve_next(nta_outgoing_t *orq)
> {
> struct sipdns_resolver *sr = orq->orq_resolver;
>
> if (sr == NULL) {
> outgoing_resolving_error(orq, SIP_500_INTERNAL_SERVER_ERROR);
> return 0;
> }
>
> if (sr->sr_results) {
> /* Use existing A/AAAA results */
> su_free(msg_home(orq->orq_request), sr->sr_results[0]);
> sr->sr_results++;
> if (sr->sr_results[0]) {
>
>
> Kind regards
> Stefan
>
>
> -----Original Message-----
> From: Pekka Pessi [mailto:[EMAIL PROTECTED]
> Sent: Thursday, October 25, 2007 6:34 PM
> To: Stefan Leuenberger
> Subject: Re: Problem with proxy switch'over based on DNS results
>
> 2007/10/25, Stefan Leuenberger <[EMAIL PROTECTED]>:
> > The above behavior prevents that the switch-over to another proxy
> works. Why
> > does the stack switch back to helios (the proxy that is down) after it
> > detected the outage and selected the next proxy (talos)?
>
> The helios should be blacklisted after the timeout, but the
> blacklisting has not been implemented in the stack.
>
> --
> Pekka.Pessi mail at nokia.com
>
--
Pekka.Pessi mail at nokia.com
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