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support for SSH protocol 1.5 which is poorly documented, the RFC.troff lies.
interops (x11,agent,etc) with 1.2.27 and protocol 1.3

#ifndef CHANNELS_H
#define CHANNELS_H

/* Definitions for channel types. */
#define SSH_CHANNEL_FREE		0 /* This channel is free (unused). */
#define SSH_CHANNEL_X11_LISTENER	1 /* Listening for inet X11 conn. */
#define SSH_CHANNEL_PORT_LISTENER	2 /* Listening on a port. */
#define SSH_CHANNEL_OPENING		3 /* waiting for confirmation */
#define SSH_CHANNEL_OPEN		4 /* normal open two-way channel */
#define SSH_CHANNEL_CLOSED		5 /* waiting for close confirmation */
/*	SSH_CHANNEL_AUTH_FD		6    authentication fd */
#define SSH_CHANNEL_AUTH_SOCKET		7 /* authentication socket */
/*	SSH_CHANNEL_AUTH_SOCKET_FD	8    connection to auth socket */
#define SSH_CHANNEL_X11_OPEN		9 /* reading first X11 packet */
#define SSH_CHANNEL_INPUT_DRAINING	10 /* sending remaining data to conn */
#define SSH_CHANNEL_OUTPUT_DRAINING	11 /* sending remaining data to app */


/* Data structure for channel data.  This is iniailized in channel_allocate
   and cleared in channel_free. */

typedef struct
{
  int type;		/* channel type/state */
  int self;		/* my own channel identifier */
  int remote_id;	/* channel identifier for remote peer */
			/* peer can be reached over encrypted connection, via packet-sent */
  int flags;		/* flags for close in proto 1.5 */
  int sock;		/* data socket, linked to this channel */
  Buffer input;		/* data read from socket, to be sent over encrypted connection */
  Buffer output;	/* data received over encrypted connection for send on socket */
  char path[200];	/* path for unix domain sockets, or host name for forwards */
  int listening_port;	/* port being listened for forwards */
  int host_port;	/* remote port to connect for forwards */
  char *remote_name;	/* remote hostname */
} Channel;

#endif