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Evan Hunt authored
- added some hook points that will be needed for a dns64 module later - moved some code from the beginning of query_respond() to the end of query_prepresponse(); this has no effect on functionality but means we can have a hook point at the top of query_respond(), which seems nicer - compressed duplicated code into query_zerottl_refetch() function - added a qctx->answered flag so that a module can prevent query_addrrset() from being called from query_respond() when it's already been called from the module.
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