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tailscale/net/dns/resolver
Nick Khyl f62e678df8 net/dns/resolver, control/controlknobs, tailcfg: use UserDial instead of SystemDial to dial DNS servers
Now that tsdial.Dialer.UserDial has been updated to honor the configured routes
and dial external network addresses without going through Tailscale, while also being
able to dial a node/subnet router on the tailnet, we can start using UserDial to forward
DNS requests. This is primarily needed for DNS over TCP when forwarding requests
to internal DNS servers, but we also update getKnownDoHClientForProvider to use it.

Updates tailscale/corp#18725

Signed-off-by: Nick Khyl <nickk@tailscale.com>
7 months ago
..
debug.go all: use Go 1.22 range-over-int 8 months ago
doh_test.go net/dns/resolver: remove maxDoHInFlight 2 years ago
forwarder.go net/dns/resolver, control/controlknobs, tailcfg: use UserDial instead of SystemDial to dial DNS servers 7 months ago
forwarder_test.go all: use Go 1.22 range-over-int 8 months ago
macios_ext.go all: avoid repeated default interface lookups 2 years ago
tsdns.go net/netns, net/dns/resolver, etc: make netmon required in most places 7 months ago
tsdns_server_test.go all: update copyright and license headers 2 years ago
tsdns_test.go net/netns, net/dns/resolver, etc: make netmon required in most places 7 months ago