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rustdeskandClaude Fable 5.1
0bc83361d6
f688d41 replaced the TCP handshake in `test_target` with the resolver's
first answer for every caller. The two are the same when an IPv6 route is
missing, or leads to nothing: a v6-only host gets the synthesized address
first either way, and the handshake sat out its second on a black hole and
fell back to that same first answer. They differ when the server refuses
IPv6 outright - an AAAA published for a daemon bound to 0.0.0.0, a firewall
that rejects - where the handshake failed fast and moved on to the A
record, and the resolver's order stays on the AAAA.
That matters on one path. `new_udp_for` and `rebind_udp_for` choose the
address the rendezvous registration lives on, and `start_udp` never leaves
UDP for TCP nor asks for a second candidate: a rebind after `MAX_FAILS2`
calls the same function and gets the same address. A self-hosted server
with such an AAAA would never see the controlled side register. Those two
keep the handshake, one round trip per server connection, under the old
name and its old behaviour. `new_direct_udp_for`, per connection and
against servers whose records are ours, takes the resolver's answer as
`resolve_target`: the round trip it was spared stays spared.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019aokqJuhjvB3kijXtAg5Ns