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Jonathan Nobels 27033c6277 net/dns: recheck DNS config on SERVFAIL errors (#12547) ... Fixes tailscale/corp#20677 Replaces the original attempt to rectify this (by injecting a netMon event) which was both heavy handed, and missed cases where the netMon event was "minor". On apple platforms, the fetching the interface's nameservers can and does return an empty list in certain situations. Apple's API in particular is very limiting here. The header hints at notifications for dns changes which would let us react ahead of time, but it's all private APIs. To avoid remaining in the state where we end up with no nameservers but we absolutely need them, we'll react to a lack of upstream nameservers by attempting to re-query the OS. We'll rate limit this to space out the attempts. It seems relatively harmless to attempt a reconfig every 5 seconds (triggered by an incoming query) if the network is in this broken state. Missing nameservers might possibly be a persistent condition (vs a transient error), but that would also imply that something out of our control is badly misconfigured. Tested by randomly returning [] for the nameservers. When switching between Wifi networks, or cell->wifi, this will randomly trigger the bug, and we appear to reliably heal the DNS state. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>		4 months ago
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publicdns	Net/DNS/Publicdns: update the IPv6 range that we use to recreate route endpoint for control D	5 months ago
recursive	all: use Go 1.22 range-over-int	6 months ago
resolvconffile	clientupdate, net/dns: fix some "tailsacle" typos	7 months ago
resolver	net/dns: recheck DNS config on SERVFAIL errors (#12547)	4 months ago
config.go	all: update copyright and license headers	2 years ago
debian_resolvconf.go	all: update copyright and license headers	2 years ago
direct.go	health, all: remove health.Global, finish plumbing health.Tracker	6 months ago
direct_linux.go	health: begin work to use structured health warnings instead of strings, pipe changes into ipn.Notify (#12406)	4 months ago
direct_notlinux.go	all: update copyright and license headers	2 years ago
direct_test.go	clientupdate, net/dns: fix some "tailsacle" typos	7 months ago
flush_default.go	all: update copyright and license headers	2 years ago
flush_windows.go	cmd/tailscaled, net/dns, wgengine/router: start Windows child processes with DETACHED_PROCESS when I/O is being piped	4 months ago
ini.go	all: update copyright and license headers	2 years ago
ini_test.go	all: update copyright and license headers	2 years ago
manager.go	net/dns: recheck DNS config on SERVFAIL errors (#12547)	4 months ago
manager_darwin.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	4 months ago
manager_default.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	4 months ago
manager_freebsd.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	4 months ago
manager_linux.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	4 months ago
manager_linux_test.go	health, all: remove health.Global, finish plumbing health.Tracker	6 months ago
manager_openbsd.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	4 months ago
manager_tcp_test.go	net/dns: don't set MatchDomains on Apple platforms when no upstream nameservers available (#12334)	5 months ago
manager_test.go	net/dns: ensure multiple hosts with the same IP address are combined into a single HostEntry	4 months ago
manager_windows.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	4 months ago
manager_windows_test.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	4 months ago
nm.go	all: cleanup unused code, part 2 (#10670)	10 months ago
noop.go	all: update copyright and license headers	2 years ago
nrpt_windows.go	net/dns: unconditionally write NRPT rules to local settings	6 months ago
openresolv.go	net/dns: log more info when openresolv commands fail	8 months ago
osconfig.go	net/dns: fix typo in OSConfig logging (#12330)	5 months ago
osconfig_test.go	all: update copyright and license headers	2 years ago
resolvconf-workaround.sh	all: update copyright and license headers	2 years ago
resolvconf.go	net/dns: properly detect newer debian resolvconf	1 year ago
resolvconfpath_default.go	net/dns: overwrite /tmp/resolv.conf on gokrazy	1 year ago
resolvconfpath_gokrazy.go	net/dns: overwrite /tmp/resolv.conf on gokrazy	1 year ago
resolvd.go	all: update copyright and license headers	2 years ago
resolved.go	health, all: remove health.Global, finish plumbing health.Tracker	6 months ago
utf.go	all: update copyright and license headers	2 years ago
utf_test.go	all: update copyright and license headers	2 years ago
wsl_windows.go	cmd/tailscaled, net/dns, wgengine/router: start Windows child processes with DETACHED_PROCESS when I/O is being piped	4 months ago