1db8e6d1db
This does some refactoring: the dns_query_process_cname() function becomes two: dns_query_process_cname_one() and dns_query_process_cname_many(). The former will process exactly one CNAME chain element, the latter will follow a chain for as long as possible within the current packet. dns_query_process_cname_many() is mostly identical to the old dns_query_process_cname(), and all existing code is moved over to using that. This is mostly preparation for the next commit, where we make direct use of dns_query_process_cname_one(). This also renames the DNS_QUERY_RESTARTED return value to DNS_QUERY_CNAME. That's because in the dns_query_process_cname_many() case as before if we return this we restarted the query in case we reached the end of the chain without a conclusive answer, as before. But in dns_query_process_cname_one() we'll only go one step anyway, and leave restarting if needed to the caller. Hence DNS_QUERY_RESTARTED is a bit of a misnomer in that case. This also gets rid of the weird tail recursion in dns_query_process_cname() and replaces it with an explicit loop in dns_query_process_cname_many(). The old recursion wasn't a security issue since we put a limit on the number of CNAMEs we follow anyway, but it's still icky to scale stack use by that.
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