Better logging for NSEC3

When dropping NSEC3 records provide better logging and add test
for NSEC3 records.

middleware/file/nsec3_test.go

@@ -5,16 +5,26 @@ import (
 	"testing"
 )
 
+func TestParseNSEC3PARAM(t *testing.T) {
+	_, err := Parse(strings.NewReader(nsec3param_test), "miek.nl", "stdin")
+	if err == nil {
+		t.Fatalf("expected error when reading zone, got nothing")
+	}
+	t.Logf("%v\n", err)
+}
+
 func TestParseNSEC3(t *testing.T) {
 	_, err := Parse(strings.NewReader(nsec3_test), "miek.nl", "stdin")
 	if err == nil {
 		t.Fatalf("expected error when reading zone, got nothing")
 	}
+	t.Logf("%v\n", err)
 }
 
-const nsec3_test = `miek.nl.		1800	IN	SOA	linode.atoom.net. miek.miek.nl. 1460175181 14400 3600 604800 14400
+const nsec3param_test = `miek.nl.	1800	IN	SOA	linode.atoom.net. miek.miek.nl. 1460175181 14400 3600 604800 14400
 miek.nl.		1800	IN	NS	omval.tednet.nl.
-miek.nl.		1800	IN	NS	linode.atoom.net.
-miek.nl.		1800	IN	NS	ext.ns.whyscream.net.
-miek.nl.		1800	IN	NS	ns-ext.nlnetlabs.nl.
 miek.nl.		0	IN	NSEC3PARAM 1 0 5 A3DEBC9CC4F695C7`
+
+const nsec3_test = `example.org.		1800	IN	SOA	sns.dns.icann.org. noc.dns.icann.org. 2016082508 7200 3600 1209600 3600
+aub8v9ce95ie18spjubsr058h41n7pa5.example.org. 284 IN NSEC3 1 1 5 D0CBEAAF0AC77314 AUB95P93VPKP55G6U5S4SGS7LS61ND85 NS SOA TXT RRSIG DNSKEY NSEC3PARAM
+aub8v9ce95ie18spjubsr058h41n7pa5.example.org. 284 IN RRSIG NSEC3 8 2 600 20160910232502 20160827231002 14028 example.org. XBNpA7KAIjorPbXvTinOHrc1f630aHic2U716GHLHA4QMx9cl9ss4QjR Wj2UpDM9zBW/jNYb1xb0yjQoez/Jv200w0taSWjRci5aUnRpOi9bmcrz STHb6wIUjUsbJ+NstQsUwVkj6679UviF1FqNwr4GlJnWG3ZrhYhE+NI6 s0k=`

middleware/file/zone.go

@@ -74,7 +74,7 @@ func (z *Zone) Insert(r dns.RR) error {
 		z.Apex.SOA = r.(*dns.SOA)
 		return nil
 	case dns.TypeNSEC3, dns.TypeNSEC3PARAM:
-		return fmt.Errorf("NSEC3 zone is not supported, dropping")
+		return fmt.Errorf("NSEC3 zone is not supported, dropping RR: %s for zone: %s", r.Header().Name, z.origin)
 	case dns.TypeRRSIG:
 		x := r.(*dns.RRSIG)
 		switch x.TypeCovered {