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Jonathan Nobels 02e3c046aa net/dns: re-query system resolvers on no-upstream resolver failure on apple platforms (#12398) ... Fixes tailscale/corp#20677 On macOS sleep/wake, we're encountering a condition where reconfigure the network a little bit too quickly - before apple has set the nameservers for our interface. This results in a persistent condition where we have no upstream resolver and fail all forwarded DNS queries. No upstream nameservers is a legitimate configuration, and we have no (good) way of determining when Apple is ready - but if we need to forward a query, and we have no nameservers, then something has gone badly wrong and the network is very broken. A simple fix here is to simply inject a netMon event, which will go through the configuration dance again when we hit the SERVFAIL condition. Tested by artificially/randomly returning [] for the list of nameservers in the bespoke ipn-bridge code responsible for getting the nameservers. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>		2 years ago
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debug.go	all: use Go 1.22 range-over-int	2 years ago
doh_test.go	net/dns/resolver: remove maxDoHInFlight	3 years ago
forwarder.go	net/dns: re-query system resolvers on no-upstream resolver failure on apple platforms (#12398)	2 years ago
forwarder_test.go	all: use Go 1.22 range-over-int	2 years ago
macios_ext.go	all: avoid repeated default interface lookups	3 years ago
tsdns.go	net/dns/resolver: return an empty successful response instead of NXDomain when resolving A records for 4via6 domains	2 years ago
tsdns_server_test.go	all: update copyright and license headers	3 years ago
tsdns_test.go	net/dns/resolver: return an empty successful response instead of NXDomain when resolving A records for 4via6 domains	2 years ago