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net/dns/resolver, control/controlknobs, tailcfg: use UserDial instead of SystemDial to dial DNS servers

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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>
This commit is contained in:
Nick Khyl
2024-05-02 18:33:13 -05:00
committed by Nick Khyl
parent c28f5767bf
commit f62e678df8
3 changed files with 30 additions and 16 deletions
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3
tailcfg/tailcfg.go
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@@ -2263,7 +2263,8 @@ const (
NodeAttrSuggestExitNodeUI NodeCapability = "suggest-exit-node-ui"
// NodeAttrUserDialUseRoutes makes UserDial use either the peer dialer or the system dialer,
// depending on the destination address and the configured routes.
// depending on the destination address and the configured routes. When present, it also makes
// the DNS forwarder use UserDial instead of SystemDial when dialing resolvers.
NodeAttrUserDialUseRoutes NodeCapability = "user-dial-routes"
)