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ipn/ipnlocal: print warning about DNS servers in bugreport --diagnose

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If the user passes the --diagnose flag, print a warning if any of the
default or fallback DNS resolvers are Tailscale IPs. This can interfere
with the ability to connect to the controlplane, and is typically
something to pay attention to if there's a connectivity issue.

Change-Id: Ib14bf6228c037877fbdcd22b069212b1a4b2c456
Signed-off-by: Andrew Dunham <andrew@tailscale.com>
This commit is contained in:
Andrew Dunham 2023-02-02 11:14:24 -05:00 committed by Andrew Dunham
parent c4eb857405
commit 5ba2543828
1 changed files with 26 additions and 0 deletions
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26
ipn/ipnlocal/local.go
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@ -4626,6 +4626,32 @@ func (b *LocalBackend) Doctor(ctx context.Context, logf logger.Logf) {
var checks []doctor.Check
checks = append(checks, routetable.Check{})
// Print a log message if any of the global DNS resolvers are Tailscale
// IPs; this can interfere with our ability to connect to the Tailscale
// controlplane.
checks = append(checks, doctor.CheckFunc("dns-resolvers", func(_ context.Context, logf logger.Logf) error {
b.mu.Lock()
nm := b.netMap
b.mu.Unlock()
if nm == nil {
return nil
}
for i, resolver := range nm.DNS.Resolvers {
ipp, ok := resolver.IPPort()
if ok && tsaddr.IsTailscaleIP(ipp.Addr()) {
logf("resolver %d is a Tailscale address: %v", i, resolver)
}
}
for i, resolver := range nm.DNS.FallbackResolvers {
ipp, ok := resolver.IPPort()
if ok && tsaddr.IsTailscaleIP(ipp.Addr()) {
logf("fallback resolver %d is a Tailscale address: %v", i, resolver)
}
}
return nil
}))
// TODO(andrew): more
numChecks := len(checks)