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Return cached entries if device is offline

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Daniel
2021-01-25 17:09:27 +01:00
parent cad957bae0
commit 0e93204caf
3 changed files with 11 additions and 12 deletions
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15
nameserver/nameserver.go
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@@ -73,13 +73,6 @@ func handleRequest(ctx context.Context, w dns.ResponseWriter, request *dns.Msg)
return nil
}
// Return with server failure if offline.
if netenv.GetOnlineStatus() == netenv.StatusOffline &&
!netenv.IsConnectivityDomain(q.FQDN) {
tracer.Debugf("nameserver: not resolving %s, device is offline", q.FQDN)
return reply(nsutil.ServerFailure("resolving disabled, device is offline"))
}
// Check the Query Class.
if originalQuestion.Qclass != dns.ClassINET {
// we only serve IN records, return nxdomain
@@ -186,6 +179,14 @@ func handleRequest(ctx context.Context, w dns.ResponseWriter, request *dns.Msg)
case errors.Is(err, resolver.ErrLocalhost):
tracer.Tracef("nameserver: returning localhost records")
return reply(nsutil.Localhost())
case errors.Is(err, resolver.ErrOffline):
if rrCache == nil {
log.Tracer(ctx).Debugf("nameserver: not resolving %s, device is offline", q.ID())
return reply(nsutil.ServerFailure(err.Error()))
}
// If an rrCache was returned, it's usable a backup.
rrCache.IsBackup = true
log.Tracer(ctx).Debugf("nameserver: device is offline, using backup cache for %s", q.ID())
default:
tracer.Warningf("nameserver: failed to resolve %s: %s", q.ID(), err)
return reply(nsutil.ServerFailure("internal error: " + err.Error()))