Channel *channel_connect_to(const char *, u_short, char *, char *);
Channel *channel_connect_by_listen_address(u_short, char *, char *);
int channel_request_remote_forwarding(const char *, u_short,
const char *, u_short);
int channel_setup_local_fwd_listener(const char *, u_short,
Channel *channel_connect_to(const char *, u_short, char *, char *);
Channel *channel_connect_by_listen_address(u_short, char *, char *);
int channel_request_remote_forwarding(const char *, u_short,
const char *, u_short);
int channel_setup_local_fwd_listener(const char *, u_short,