int channel_setup_local_fwd_listener(const char *, u_short,
const char *, u_short, int);
void channel_request_rforward_cancel(const char *host, u_short port);
int channel_setup_local_fwd_listener(const char *, u_short,
const char *, u_short, int);
void channel_request_rforward_cancel(const char *host, u_short port);