/*	$Id: krb_lib.c,v 1.3 1997/01/17 07:11:52 millert Exp $	*/

/*-
 * 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 "kdb_locl.h"

#ifdef DEBUG
extern int debug;
extern char *progname;
long    kerb_debug;
#endif

static int init = 0;

/*
 * initialization routine for data base 
 */

int
kerb_init()
{
#ifdef DEBUG
    if (!init) {
	char *dbg = getenv("KERB_DBG");
	if (dbg)
	    sscanf(dbg, "%d", &kerb_debug);
	init = 1;
    }
#endif
    kerb_db_init();

#ifdef CACHE
    kerb_cache_init();
#endif

    /* successful init, return 0, else errcode */
    return (0);
}

/*
 * finalization routine for database -- NOTE: MUST be called by any
 * program using kerb_init.  ALSO will have to be modified to finalize
 * caches, if they're ever really implemented. 
 */

void
kerb_fini()
{
    kerb_db_fini();
}

/*
 * look up a principal in the cache or data base returns number of
 * principals found 
 */

int
kerb_get_principal(name, inst, principal, max, more)
	char *name;		/* could have wild card */
	char *inst;		/* could have wild card */
	Principal *principal;
	unsigned int max;	/* max number of name structs to return */
	int *more;		/* more tuples than room for */

{
    int     found = 0;
#ifdef CACHE
    static int wild = 0;
#endif
    if (!init)
	kerb_init();

#ifdef DEBUG
    if (kerb_debug & 1)
	fprintf(stderr, "\n%s: kerb_get_principal for %s %s max = %d\n",
	    progname, name, inst, max);
#endif
    
    /*
     * if this is a request including a wild card, have to go to db
     * since the cache may not be exhaustive. 
     */

    /* clear the principal area */
    bzero((char *) principal, max * sizeof(Principal));

#ifdef CACHE
    /*
     * so check to see if the name contains a wildcard "*" or "?", not
     * preceeded by a backslash. 
     */
    wild = 0;
    if (strchr(name, '*') || strchr(name, '?') ||
	strchr(inst, '*') || strchr(inst, '?'))
	wild = 1;

    if (!wild) {
	/* try the cache first */
	found = kerb_cache_get_principal(name, inst, principal, max, more);
	if (found)
	    return (found);
    }
#endif
    /* If we didn't try cache, or it wasn't there, try db */
    found = kerb_db_get_principal(name, inst, principal, max, more);
    /* try to insert principal(s) into cache if it was found */
#ifdef CACHE
    if (found) {
	kerb_cache_put_principal(principal, found);
    }
#endif
    return (found);
}

/* principals */
int
kerb_put_principal(principal, n)
	Principal *principal;
	unsigned int n;		/* number of principal structs to write */
{
    struct tm *tp;

    /* set mod date */
    principal->mod_date = time((time_t *)0);
    /* and mod date string */

    tp = k_localtime(&principal->mod_date);
    (void) snprintf(principal->mod_date_txt, sizeof(principal->mod_date_txt),
		    "%4d-%2d-%2d",
		    tp->tm_year > 1900 ? tp->tm_year : tp->tm_year + 1900,
		    tp->tm_mon + 1, tp->tm_mday); /* January is 0, not 1 */
#ifdef DEBUG
    if (kerb_debug & 1) {
	int i;
	fprintf(stderr, "\nkerb_put_principal...");
	for (i = 0; i < n; i++) {
	    krb_print_principal(&principal[i]);
	}
    }
#endif
    /* write database */
    if (kerb_db_put_principal(principal, n) < 0) {
#ifdef DEBUG
	if (kerb_debug & 1)
	    fprintf(stderr, "\n%s: kerb_db_put_principal err", progname);
	/* watch out for cache */
#endif
	return -1;
    }
#ifdef CACHE
    /* write cache */
    if (!kerb_cache_put_principal(principal, n)) {
#ifdef DEBUG
	if (kerb_debug & 1)
	    fprintf(stderr, "\n%s: kerb_cache_put_principal err", progname);
#endif
	return -1;
    }
#endif
    return 0;
}

int
kerb_get_dba(name, inst, dba, max, more)
	char *name;		/* could have wild card */
	char *inst;		/* could have wild card */
	Dba *dba;
	unsigned int max;	/* max number of name structs to return */
	int *more;		/* more tuples than room for */

{
    int     found = 0;
#ifdef CACHE
    static int wild = 0;
#endif
    if (!init)
	kerb_init();

#ifdef DEBUG
    if (kerb_debug & 1)
	fprintf(stderr, "\n%s: kerb_get_dba for %s %s max = %d\n",
	    progname, name, inst, max);
#endif
    /*
     * if this is a request including a wild card, have to go to db
     * since the cache may not be exhaustive. 
     */

    /* clear the dba area */
    bzero((char *) dba, max * sizeof(Dba));

#ifdef CACHE
    /*
     * so check to see if the name contains a wildcard "*" or "?", not
     * preceeded by a backslash. 
     */

    wild = 0;
    if (strchr(name, '*') || strchr(name, '?') ||
	strchr(inst, '*') || strchr(inst, '?'))
	wild = 1;

    if (!wild) {
	/* try the cache first */
	found = kerb_cache_get_dba(name, inst, dba, max, more);
	if (found)
	    return (found);
    }
#endif
    /* If we didn't try cache, or it wasn't there, try db */
    found = kerb_db_get_dba(name, inst, dba, max, more);
#ifdef CACHE
    /* try to insert dba(s) into cache if it was found */
    if (found) {
	kerb_cache_put_dba(dba, found);
    }
#endif
    return (found);
}