- int, Buffer *, char **, dispatch_fn *);
+ int, Buffer *, char **);
+int client_request_tun_fwd(int, int, int);
+
+/* Escape filter for protocol 2 sessions */
+void *client_new_escape_filter_ctx(int);
+void client_filter_cleanup(int, void *);
+int client_simple_escape_filter(Channel *, char *, int);
+
+/* Global request confirmation callbacks */
+typedef void global_confirm_cb(int, u_int32_t seq, void *);
+void client_register_global_confirm(global_confirm_cb *, void *);
+
+/* Multiplexing protocol version */
+#define SSHMUX_VER 4