store complete cookie when receiving from downstream. Add function through search through an edns_option list

util/data/msgparse.c

@@ -597,6 +597,19 @@ parse_query_section(sldns_buffer* pkt, struct msg_parse* msg)
 	return 0;
 }
 
+struct edns_option*
+edns_list_get_option(struct edns_option* option, uint16_t code)
+{
+	while (option) {
+		if (option->opt_code == code) {
+			return option;
+		}
+
+		option = option->next;
+	}
+	return NULL;
+}
+
 size_t
 get_rdf_size(sldns_rdf_type rdf)
 {