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package dnssec
import (
"hash/fnv"
"io"
"time"
"github.com/coredns/coredns/plugin/pkg/cache"
"github.com/miekg/dns"
)
// hash serializes the RRset and returns a signature cache key.
func hash(rrs []dns.RR) uint64 {
h := fnv.New64()
// we need to hash the entire RRset to pick the correct sig, if the rrset
// changes for whatever reason we should resign.
// We could use wirefmt, or the string format, both create garbage when creating
// the hash key. And of course is a uint64 big enough?
for _, rr := range rrs {
io.WriteString(h, rr.String())
}
return h.Sum64()
}
func periodicClean(c *cache.Cache, stop <-chan struct{}) {
tick := time.NewTicker(8 * time.Hour)
defer tick.Stop()
for {
select {
case <-tick.C:
// we sign for 8 days, check if a signature in the cache reached 75% of that (i.e. 6), if found delete
// the signature
is75 := time.Now().UTC().Add(sixDays)
c.Walk(func(items map[uint64]interface{}, key uint64) bool {
sig := items[key].(*dns.RRSIG)
if !sig.ValidityPeriod(is75) {
delete(items, key)
}
return true
})
case <-stop:
return
}
}
}
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