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net/dns, health: raise health warning for failing forwarded DNS queries (#12888)

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updates tailscale/corp#21823

Misconfigured, broken, or blocked DNS will often present as
"internet is broken'" to the end user.  This  plumbs the health tracker
into the dns manager and forwarder and adds a health warning
with a 5 second delay that is raised on failures in the forwarder and
lowered on successes.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>
This commit is contained in:
Jonathan Nobels
2024-07-29 13:48:46 -04:00
committed by GitHub
parent 3088c6105e
commit 19b0c8a024
7 changed files with 53 additions and 8 deletions
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4
net/dns/resolver/tsdns_test.go
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@ -23,6 +23,7 @@ import (
miekdns "github.com/miekg/dns"
dns "golang.org/x/net/dns/dnsmessage"
"tailscale.com/health"
"tailscale.com/net/netaddr"
"tailscale.com/net/netmon"
"tailscale.com/net/tsdial"
@ -354,6 +355,7 @@ func newResolver(t testing.TB) *Resolver {
return New(t.Logf,
nil, // no link selector
tsdial.NewDialer(netmon.NewStatic()),
new(health.Tracker),
nil, // no control knobs
)
}
@ -1068,7 +1070,7 @@ func TestForwardLinkSelection(t *testing.T) {
return "special"
}
return ""
}), new(tsdial.Dialer), nil /* no control knobs */)
}), new(tsdial.Dialer), new(health.Tracker), nil /* no control knobs */)
// Test non-special IP.
if got, err := fwd.packetListener(netip.Addr{}); err != nil {