Make opcode public and fix the IsEdns0

defaults.go

@@ -3,9 +3,6 @@ package dns
 // Everything is assumed in the ClassINET class. If
 // you need other classes you are on your own.
 
-// Add SetEDNS0
-// IsEDNS0  function
-
 // SetReply creates a reply packet from a request message.
 func (dns *Msg) SetReply(request *Msg) {
 	dns.MsgHdr.Id = request.MsgHdr.Id
@@ -188,9 +185,14 @@ func (dns *Msg) IsTsig() (ok bool) {
 	return
 }
 
-// IsEdns0 checks if the message has a Edns0 record, as the last
-// or the one before the last, in the additional section.
+// IsEdns0 checks if the message has a Edns0 record, any EDNS0
+// record in the additional section will do
 func (dns *Msg) IsEdns0() (ok bool) {
+        for _, r := range dns.Extra {
+                if r.Header().Rrtype == TypeOPT {
+                        return true
+                }
+        }
         return
 }
 

msg.go

@@ -880,8 +880,8 @@ func (h *MsgHdr) String() string {
 		return "<nil> MsgHdr"
 	}
 
-	s := ";; opcode: " + opcode_str[h.Opcode]
-	s += ", status: " + rcode_str[h.Rcode]
+	s := ";; opcode: " + Opcode_str[h.Opcode]
+	s += ", status: " + Rcode_str[h.Rcode]
 	s += ", id: " + strconv.Itoa(int(h.Id)) + "\n"
 
 	s += ";; flags:"