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net/dns: add health check for particular broken-ish Linux DNS config

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Updates #3937 (need to write docs before closing)

Change-Id: I1df7244cfbb0303481e2621ee750d21358bd67c6
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-02-15 06:59:15 -08:00
committed by Brad Fitzpatrick
parent 57115e923e
commit 2ff481ff10
2 changed files with 10 additions and 1 deletions
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7
health/health.go
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@@ -64,6 +64,9 @@ const (
// SysDNSOS is the name of the net/dns OSConfigurator subsystem.
SysDNSOS = Subsystem("dns-os")
// SysDNSManager is the name of the net/dns manager subsystem.
SysDNSManager = Subsystem("dns-manager")
// SysNetworkCategory is the name of the subsystem that sets
// the Windows network adapter's "category" (public, private, domain).
// If it's unhealthy, the Windows firewall rules won't match.
@@ -110,6 +113,10 @@ func DNSHealth() error { return get(SysDNS) }
// SetDNSOSHealth sets the state of the net/dns.OSConfigurator
func SetDNSOSHealth(err error) { set(SysDNSOS, err) }
// SetDNSManagerHealth sets the state of the Linux net/dns manager's
// discovery of the /etc/resolv.conf situation.
func SetDNSManagerHealth(err error) { set(SysDNSManager, err) }
// DNSOSHealth returns the net/dns.OSConfigurator error state.
func DNSOSHealth() error { return get(SysDNSOS) }