Upgrade the definition of domain name

defaults.go

@@ -243,8 +243,8 @@ func IsDomainName(s string) (uint8, uint8, bool) { // copied from net package.
 			}
 			partlen++
 		case c == '.':
-			// byte before dot cannot be dot, dash
-			if last == '.' || last == '-' {
+			// byte before dot cannot be dot
+			if last == '.' {
 				return 0, uint8(l - longer), false
 			}
 			if last == '\\' { // Ok, escaped dot.

dns_test.go

@@ -111,6 +111,7 @@ func TestPack(t *testing.T) {
 		m.Answer[0], err = NewRR(r)
 		if err != nil {
 			t.Logf("Failed to create RR: %s\n", err.Error())
+			t.Fail()
 			continue
 		}
 		if _, ok := m.Pack(); !ok {

msg.go

@@ -1284,7 +1284,6 @@ func (dns *Msg) Len() int {
 	for i := 0; i < len(dns.Question); i++ {
 		l += dns.Question[i].Len()
 	}
-	println("LENGTE", len(dns.Answer))
 	for i := 0; i < len(dns.Answer); i++ {
 		l += dns.Answer[i].Len()
 	}