[Bug network/24255] resolver should handle special domains correctly

["pemensik at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24255

--- Comment #3 from Petr Menšík <pemensik at redhat dot com> ---
I do not think we ever want to override output of files database. If the user
defines his own example.onion name in /etc/hosts, then he should receive it in
queries. He wants it and we should not filter his wishes.

And for DNS, we cannot know if that the server is connected to Tor or not. I
guess we could block DNS query if the server were not sent to ::1 or
127.0.0.0/8. But handling this at dns plugin seems wrong to me. And it should
be possible to configure it for unusual setups, where we want it forwarded
anyway.

I think system services like Network Manager or systemd-networkd would be
better suited to decide whether such queries should be forwarded or discarded
on low level. Perhaps Tor service could remove onion domain from blocked list
on startup and return it when shut down.

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