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Brad Fitzpatrick
92a64b306d
dnsConfigForNetmap called appc.AppDNSRoutes directly to synthesize the conn25 split DNS routes from the self node's capability map, which was the one place node_backend.go depended on the appc package and was marked with a TODO to make it a hook. Add ipnext.Hooks.ExtraDNSRoutes, which returns extension-supplied split DNS routes. authReconfigLocked calls it and passes the result into dnsConfigForNetmap, which adds the routes alongside the netmap's own routes with the same UseWithExitNode handling as before. The hook takes no arguments: the conn25 extension computes the routes in its OnSelfChange handler and clears them on a switch to a different node, and it already tracks the AppConnector.Advertise pref from ProfileStateChange. Both of those hooks fire before the reconfig that consults ExtraDNSRoutes, so the state is current. The conditions are unchanged: no routes when this node itself advertises as an app connector, and none without the experimental capability. Updates tailscale/corp#37125 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I6c2e9f4b8a1d3e7f5c0b2a9d8e6f4c3b1a7d5e9f