diff options
Diffstat (limited to 'plugin/cache/item.go')
| -rw-r--r-- | plugin/cache/item.go | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/plugin/cache/item.go b/plugin/cache/item.go index 094b8bb2e..5761cdf87 100644 --- a/plugin/cache/item.go +++ b/plugin/cache/item.go @@ -99,7 +99,32 @@ func minMsgTTL(m *dns.Msg, mt response.Type) time.Duration { } minTTL := maxTTL - for _, r := range append(append(m.Answer, m.Ns...), m.Extra...) { + for _, r := range m.Answer { + switch mt { + case response.NameError, response.NoData: + if r.Header().Rrtype == dns.TypeSOA { + minTTL = time.Duration(r.(*dns.SOA).Minttl) * time.Second + } + case response.NoError, response.Delegation: + if r.Header().Ttl < uint32(minTTL.Seconds()) { + minTTL = time.Duration(r.Header().Ttl) * time.Second + } + } + } + for _, r := range m.Ns { + switch mt { + case response.NameError, response.NoData: + if r.Header().Rrtype == dns.TypeSOA { + minTTL = time.Duration(r.(*dns.SOA).Minttl) * time.Second + } + case response.NoError, response.Delegation: + if r.Header().Ttl < uint32(minTTL.Seconds()) { + minTTL = time.Duration(r.Header().Ttl) * time.Second + } + } + } + + for _, r := range m.Extra { if r.Header().Rrtype == dns.TypeOPT { // OPT records use TTL field for extended rcode and flags continue @@ -107,7 +132,7 @@ func minMsgTTL(m *dns.Msg, mt response.Type) time.Duration { switch mt { case response.NameError, response.NoData: if r.Header().Rrtype == dns.TypeSOA { - return time.Duration(r.(*dns.SOA).Minttl) * time.Second + minTTL = time.Duration(r.(*dns.SOA).Minttl) * time.Second } case response.NoError, response.Delegation: if r.Header().Ttl < uint32(minTTL.Seconds()) { |