initial commit

dnssec.go

@@ -0,0 +1,24 @@
+package cache
+
+import "github.com/miekg/dns"
+
+// filterRRSlice filters out OPT RRs, and sets all RR TTLs to ttl.
+// If dup is true the RRs in rrs are _copied_ before adjusting their
+// TTL and the slice of copied RRs is returned.
+func filterRRSlice(rrs []dns.RR, ttl uint32, dup bool) []dns.RR {
+	j := 0
+	rs := make([]dns.RR, len(rrs))
+	for _, r := range rrs {
+		if r.Header().Rrtype == dns.TypeOPT {
+			continue
+		}
+		if dup {
+			rs[j] = dns.Copy(r)
+		} else {
+			rs[j] = r
+		}
+		rs[j].Header().Ttl = ttl
+		j++
+	}
+	return rs[:j]
+}