/*
 * upap.h - User/Password Authentication Protocol definitions.
 *
 * Copyright (c) 1989 Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * $Id$
 */

/*
 * Packet header = Code, id, length.
 */
#define UPAP_HEADERLEN	4


/*
 * UPAP codes.
 */
#define UPAP_AUTHREQ	1	/* Authenticate-Request */
#define UPAP_AUTHACK	2	/* Authenticate-Ack */
#define UPAP_AUTHNAK	3	/* Authenticate-Nak */


/*
 * Each interface is described by upap structure.
 */
typedef struct upap_state {
    int us_unit;		/* Interface unit number */
    char *us_user;		/* User */
    int us_userlen;		/* User length */
    char *us_passwd;		/* Password */
    int us_passwdlen;		/* Password length */
    int us_clientstate;		/* Client state */
    int us_serverstate;		/* Server state */
    u_char us_id;		/* Current id */
    int us_timeouttime;		/* Timeout (seconds) for auth-req retrans. */
    int us_transmits;		/* Number of auth-reqs sent */
    int us_maxtransmits;	/* Maximum number of auth-reqs to send */
    int us_reqtimeout;		/* Time to wait for auth-req from peer */
} upap_state;


/*
 * Client states.
 */
#define UPAPCS_INITIAL	0	/* Connection down */
#define UPAPCS_CLOSED	1	/* Connection up, haven't requested auth */
#define UPAPCS_PENDING	2	/* Connection down, have requested auth */
#define UPAPCS_AUTHREQ	3	/* We've sent an Authenticate-Request */
#define UPAPCS_OPEN	4	/* We've received an Ack */
#define UPAPCS_BADAUTH	5	/* We've received a Nak */

/*
 * Server states.
 */
#define UPAPSS_INITIAL	0	/* Connection down */
#define UPAPSS_CLOSED	1	/* Connection up, haven't requested auth */
#define UPAPSS_PENDING	2	/* Connection down, have requested auth */
#define UPAPSS_LISTEN	3	/* Listening for an Authenticate */
#define UPAPSS_OPEN	4	/* We've sent an Ack */
#define UPAPSS_BADAUTH	5	/* We've sent a Nak */


/*
 * Timeouts.
 */
#define UPAP_DEFTIMEOUT	5	/* Timeout (seconds) for retransmitting req */
#define UPAP_DEFREQTIME	30	/* Time to wait for auth-req from peer */

extern upap_state upap[];

void upap_authwithpeer(int, char *, char *);
void upap_authpeer(int);

extern struct protent pap_protent;