/*	$OpenBSD: tkt_string.c,v 1.7 1998/02/25 15:51:46 art Exp $	*/
/* $KTH: tkt_string.c,v 1.11 1997/10/24 10:18:07 assar Exp $ */

/*
 * This source code is no longer held under any constraint of USA
 * `cryptographic laws' since it was exported legally.  The cryptographic
 * functions were removed from the code and a "Bones" distribution was
 * made.  A Commodity Jurisdiction Request #012-94 was filed with the
 * USA State Department, who handed it to the Commerce department.  The
 * code was determined to fall under General License GTDA under ECCN 5D96G,
 * and hence exportable.  The cryptographic interfaces were re-added by Eric
 * Young, and then KTH proceeded to maintain the code in the free world.
 *
 */

/* 
 *  Copyright (C) 1989 by the Massachusetts Institute of Technology
 *
 *  Export of this software from the United States of America is assumed
 *  to require a specific license from the United States Government.
 *  It is the responsibility of any person or organization contemplating
 *  export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 */

#include "krb_locl.h"

/*
 * This routine is used to generate the name of the file that holds
 * the user's cache of server tickets and associated session keys.
 *
 * If it is set, krb_ticket_string contains the ticket file name.
 * Otherwise, the filename is constructed as follows:
 *
 * If it is set, the environment variable "KRBTKFILE" will be used as
 * the ticket file name.  Otherwise TKT_ROOT (defined in "krb.h") and
 * the user's uid are concatenated to produce the ticket file name
 * (e.g., "/tmp/tkt123").  A pointer to the string containing the ticket
 * file name is returned.
 */

static char krb_ticket_string[MAXPATHLEN] = "";

char *
tkt_string(void)
{
    char *env;

    if (krb_ticket_string[0] == '\0') {
        if ((env = getenv("KRBTKFILE"))) {
	    strncpy(krb_ticket_string, env,
			   sizeof(krb_ticket_string)-1);
	    krb_ticket_string[sizeof(krb_ticket_string)-1] = '\0';
	} else {
	    snprintf(krb_ticket_string, sizeof(krb_ticket_string),
		     "%s%u",TKT_ROOT,(unsigned)getuid());
        }
    }
    return krb_ticket_string;
}

/*
 * This routine is used to set the name of the file that holds the user's
 * cache of server tickets and associated session keys.
 *
 * The value passed in is copied into local storage.
 *
 * NOTE:  This routine should be called during initialization, before other
 * Kerberos routines are called; otherwise tkt_string() above may be called
 * and return an undesired ticket file name until this routine is called.
 */

void
krb_set_tkt_string(const char *val)
{

    strncpy(krb_ticket_string, val, sizeof(krb_ticket_string)-1);
    krb_ticket_string[sizeof(krb_ticket_string)-1] = '\0';

    return;
}