Cuong Manh Le 79476add12 Testing nameserver when initializing OS resolver ...

There are several issues with OS resolver right now:

 - The list of nameservers are obtained un-conditionally from all
   running interfaces.

 - ControlD public DNS query is always be used if response ok.

This could lead to slow query time, and also incorrect result if a
domain is resolved differently between internal DNS and ControlD public
DNS.

To fix these problems:

 - While initializing OS resolver, sending a test query to the
   nameserver to ensure it will response. Unreachable nameserver will
   not be used.

 - Only use ControlD public DNS success response as last one, preferring
   ok response from internal DNS servers.

While at it, also using standard package slices, since ctrld now
requires go1.21 as the minimum version.

2024-08-12 14:16:02 +07:00

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