request: add match function (#1615)

request/request.go

@@ -361,6 +361,24 @@ func (r *Request) Clear() {
 	r.name = ""
 }
 
+// Match checks if the reply matches the qname and qtype from the request, it returns
+// false when they don't match.
+func (r *Request) Match(reply *dns.Msg) bool {
+	if len(reply.Question) != 1 {
+		return false
+	}
+
+	if strings.ToLower(reply.Question[0].Name) != r.Name() {
+		return false
+	}
+
+	if reply.Question[0].Qtype != r.QType() {
+		return false
+	}
+
+	return true
+}
+
 const (
 	// TODO(miek): make this less awkward.
 	doTrue  = 1