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This function emits the UDP packet via the scope, but first it will
determine the current server (and connect to it) and store the
server in the transaction.
This should not change the behavior, but simplifies the code.
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With access to the server when creating the socket, we can connect()
to the server and hence simplify message sending and receiving in
follow-up patches.
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It's not used anymore since 29815b6c608b836cada5e349d06a96b63eaa65f3,
hence let's remove it from the sources.
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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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We want to discover information about the server and use that in when crafting
packets to be resent.
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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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on_conflict_dispatch() uses hashmap_steal_first() and then does
something non-trivial with it. It may care about the order.
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something up
Also, return on which protocol/family/interface we found something.
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based on cached data
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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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Name defending is still missing.
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Let's settle on a single type for all address family values, even if
UNIX is very inconsitent on the precise type otherwise. Given that
socket() is the primary entrypoint for the sockets API, and that uses
"int", and "int" is relatively simple and generic, we settle on "int"
for this.
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Let's turn resolved into a something truly useful: a fully asynchronous
DNS stub resolver that subscribes to network changes.
(More to come: caching, LLMNR, mDNS/DNS-SD, DNSSEC, IDN, NSS module)
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