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Extended DNS error 22 (No reachable authority) was previously detected when `fctx_expired` fired. It turns out this function is used as a "safety net" and the timeout detection should be caught earlier. It was working though, because of another issue fixed by !9927. Since this change, the recursive request timed out detection occurs before `fctx_expired` so EDE 22 is not added to the response message anymore. The fix of the problem is to add the EDE 22 code in two situations: - When the dispatch code timed out (rctx_timedout) the resolver code checks various properties to figure out if it needs to make another fetch attempt. One of the paramters if the fetch expiration time. If it expires, the whole recursion is canceled, so it now adds the EDE 22 code. - If the fetch expiration time doesn't expires in the case above (and other parameters allows it) a new fetch attempt is made (fctx_query). But before the new request is actually made, the fetch expiration time is re-checked. It might then has elapsed, and the whole recursion is canceled. So it now also adds the EDE 22 code here as well. |
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