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729c16a8ac
This fixes the plethora of 64k buffers that got allocated when doing DNSSEC over TCP. By using the UDP buffer is pass the query into tcp_talk() and allowing tcp_talk to allocate its output buffer one the size of the reply is known, we only need to allocate as much memory as is required. The final reply to the TCP query still needs the 64k buffer because answer_request() and answer_auth() are not capable of extending their output buffers.