dnsdist: Optionally export CNAME over protobuf

[rgacogne]

• Program: dnsdist
• Issue type: Feature request

Short description

dnsdist tries very hard to parse as little as possible of DNS responses, and for this reason only exports A and AAAA records over protobuf, whereas the recursor also exports CNAME ones. It would be nice to be able to log these, at a slightly increased CPU cost.

We could for example add a parseCNAME option to newRemoteLogger():

newRemoteLogger(address:port [, timeout=2, maxQueuedEntries=100, reconnectWaitTime=1, parseCNAME=false])