Method setMinMaxTTL

proxy/server.go:172–204

setMinMaxTTL sets the TTL values of all records according to the proxy settings. r must not be nil.

(ctx context.Context, r *dns.Msg)

// setMinMaxTTL sets the TTL values of all records according to the proxy
// settings.  r must not be nil.
func (p *Proxy) setMinMaxTTL(ctx context.Context, r *dns.Msg) {
	rrSets := container.KeyValues[string, []dns.RR]{{
		Key:   "answer",
		Value: r.Answer,
	}, {
		Key:   "extra",
		Value: r.Extra,
	}, {
		Key:   "ns",
		Value: r.Ns,
	}}

	for _, rrSet := range rrSets {
		for _, rr := range rrSet.Value {
			original := rr.Header().Ttl
			overridden := respectTTLOverrides(original, p.CacheMinTTL, p.CacheMaxTTL)

			if original == overridden {
				continue
			}

			optslog.Trace3(
				ctx,
				p.logger,
				"ttl overwritten",
				"section", rrSet.Key,
				"old", original,
				"new", overridden,
			)
			rr.Header().Ttl = overridden
		}
	}
}

// logDNSMessage logs the given DNS message.
func (p *Proxy) logDNSMessage(ctx context.Context, m *dns.Msg) {