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As we have connect()ed to the desired DNS server, we no longer need to pass
control messages manually when sending packets. Simplify the logic accordingly.
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We used to have one global socket, use one per transaction instead. This
has the side-effect of giving us a random UDP port per transaction, and
hence increasing the entropy and making cache poisoining significantly
harder to achieve.
We still reuse the same port number for packets belonging to the same
transaction (resent packets).
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This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
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We can simplify our code quite a bit if we explicitly check for the
ifindex being 1 on Linux as a loopback check. Apparently, this is
hardcoded on Linux on the kernel, and effectively exported to userspace
via rtnl and such, hence we should be able to rely on it.
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disable LLMNR and warn, but continue
This allows us to run resolved inside an nspawn container that shares
the network namespace with the host, if there's already an instance
running.
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This way we integrate nicely with foreign network management stacks,
such as NM.
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After all it pretty much exlcusively containers definitions about the
"Manager" object, hence let's call this the most obvious way.
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