Added check for domain name format.

- If labels are not parsed well, error is returned

Warning: This check was commented as if it was wrong in some case.
         Don't know why and enabling it may cause some problems.

libknot/dname.c

@@ -270,12 +270,12 @@ static int knot_dname_find_labels(knot_dname_t *dname, int alloc)
 	}
 
 	// TODO: how to check if the domain name has right format?
-//	if (pos - name < size && *pos != '0') {
-//		dbg_dname("Wrong wire format of domain name!\n");
-//		dbg_dname("Position: %d, character: %d, expected"
-//				   " size: %d\n", pos - name, *pos, size);
-//		return -1;
-//	}
+	if (pos - name > size || *pos != '\0') {
+		dbg_dname("Wrong wire format of domain name!\n");
+		dbg_dname("Position: %d, character: %d, expected"
+				   " size: %d\n", pos - name, *pos, size);
+		return -1;
+	}
 
 	if (alloc) {
 		dname->labels

libknot/packet/packet.c

@@ -797,6 +797,8 @@ int knot_packet_parse_from_wire(knot_packet_t *packet,
 		packet->parsed = pos;
 	}
 
+	knot_packet_dump(packet);
+
 	if (question_only) {
 		return KNOT_EOK;
 	}