extern void free_node(node_t *);
extern void node_add(struct meshlink_handle *mesh, node_t *);
extern void node_del(struct meshlink_handle *mesh, node_t *);
-extern node_t *lookup_node(struct meshlink_handle *mesh, char *);
+extern node_t *lookup_node(struct meshlink_handle *mesh, const char *);
extern node_t *lookup_node_udp(struct meshlink_handle *mesh, const sockaddr_t *);
extern void update_node_udp(struct meshlink_handle *mesh, node_t *, const sockaddr_t *);