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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>
2 weeks ago
..
debug.go all: use Go 1.22 range-over-int 1 month ago
doh_test.go net/dns/resolver: remove maxDoHInFlight 1 year ago
forwarder.go net/dns/resolver, control/controlknobs, tailcfg: use UserDial instead of SystemDial to dial DNS servers 2 weeks ago
forwarder_test.go all: use Go 1.22 range-over-int 1 month ago
macios_ext.go all: avoid repeated default interface lookups 1 year ago
tsdns.go net/netns, net/dns/resolver, etc: make netmon required in most places 3 weeks ago
tsdns_server_test.go all: update copyright and license headers 1 year ago
tsdns_test.go net/netns, net/dns/resolver, etc: make netmon required in most places 3 weeks ago