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David Anderson 320cc8fa21 net/dns: verify that systemd-resolved is actually in charge. ... It's possible to install a configuration that passes our current checks for systemd-resolved, without actually pointing to systemd-resolved. In that case, we end up programming DNS in resolved, but that config never applies to any name resolution requests on the system. This is quite a far-out edge case, but there's a simple additional check we can do: if the header comment names systemd-resolved, there should be a single nameserver in resolv.conf pointing to 127.0.0.53. If not, the configuration should be treated as an unmanaged resolv.conf. Fixes #2136. Signed-off-by: David Anderson <danderson@tailscale.com>		5 years ago
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resolver	net/dns/resolver: permit larger max responses, signal truncation	5 years ago
config.go	net/dns: replace AuthoritativeSuffixes with nil Route entries.	5 years ago
debian_resolvconf.go	net/dns: add GOOS build tags	5 years ago
direct.go	net/dns: add GOOS build tags	5 years ago
flush_windows.go	Move DNS flush logic to net/dns.	5 years ago
manager.go	net/dns: replace AuthoritativeSuffixes with nil Route entries.	5 years ago
manager_default.go	net/dns: return error from NewOSManager, use it to initialize NM.	5 years ago
manager_freebsd.go	net/dns: fix freebsd DNS manager selection.	5 years ago
manager_linux.go	net/dns: verify that systemd-resolved is actually in charge.	5 years ago
manager_openbsd.go	net/dns: return error from NewOSManager, use it to initialize NM.	5 years ago
manager_test.go	net/dns: replace AuthoritativeSuffixes with nil Route entries.	5 years ago
manager_windows.go	net/dns: on windows, skip site-local v6 resolvers.	5 years ago
nm.go	Revert "net/dns: set IPv4 auto mode in NM, so it lets us set DNS."	5 years ago
noop.go	net/dns: return error from NewOSManager, use it to initialize NM.	5 years ago
openresolv.go	net/dns: add GOOS build tags	5 years ago
osconfig.go	net/dns: make debian_resolvconf correctly clear DNS configs.	5 years ago
registry_windows.go	wgengine/router/dns: move to net/dns.	5 years ago
resolvconf-workaround.sh	net/dns: also include 'tail' and 'base' files when fixing up resolv.conf.	5 years ago
resolvconf.go	net/dns: add GOOS build tags	5 years ago
resolved.go	net/dns: don't use interfaces.Tailscale to find the tailscale interface index.	5 years ago