/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#include <poll.h>
#include <sys/time.h>
#include <stdlib.h>
#include "nis_ldap.h"
#include "nis_hashitem.h"
#include "ldap_map.h"
#include "ldap_parse.h"


/*
 * Global structure keeping config state. Since it's created and modified
 * while the rpc.nisd still is single-threaded, and only read in MT mode,
 * no locking is needed.
 */
__nis_config_t  ldapConfig = {
        ini_none,                       /* nisplusLDAPinitialUpdate */
        pass_error,                     /* nisplusLDAPthreadCreationError */
        {
                -1,                     /* Try forever */
                15                      /* 15 second timeout */
        },
        de_retry,                       /* nisplusLDAPdumpError */
        {
                -1,                     /* Try forever */
                200                     /* 200 second timeout */
        },
        directory_locked,               /* nisplusLDAPresyncService */
        accumulate,                     /* nisplusLDAPupdateBatching */
        {
                -1,                     /* Not used */
                120                     /* Accumulate for 120 seconds */
        },
        block                           /* nisplusLDAPexclusiveWaitMOde */
};


/*
 * Utility function that accepts a (__nisdb_retry_t *), decrements the
 * 'attempts' counter, and sleeps for 'timeout' seconds.
 *
 * NOTE:        Don't pass a pointer into the 'ldapConfig' structure to
 *              this function. Instead, initialize a private copy to the
 *              value from 'ldapConfig'.
 *
 * The value of 'attempts' upon entry determines action as follows:
 *
 *      < 0     Don't change 'attempts', sleep as indicated, return 1
 *
 *        0     Don't change 'attempts', only sleep if forceSleep is set,
 *              return 0 if we didn't sleep, 1 if we slept.
 *
 *      > 0     Decrement 'attempts', sleep as indicated, return 1
 */
int
__nis_retry_sleep(__nisdb_retry_t *retry, int forceSleep)
{

        if (retry == NULL)
                return (0);

        if (retry->attempts > 0) {
                retry->attempts -= 1;
        } else if (retry->attempts == 0 && !forceSleep) {
                return (0);
        }

        (void) poll(NULL, 0, retry->timeout*1000);

        return (1);
}

/*
 * The root directory is special in NIS+; it's the only directory that
 * doesn't appear as an entry in another directory. Hence, our method
 * of keeping the directory/table entry expiration time in the
 * directory/table doesn't work, and we instead implement the following
 * interface.
 */
static time_t   rootDirExpire = 0;
static int      rootDirTtl = 0;

/*
 * Return 1 if the root dir has expired, 0 otherwise.
 */
int
rootDirExpired(void)
{
        struct timeval  now;

        (void) gettimeofday(&now, 0);

        if (rootDirExpire >= now.tv_sec)
                return (1);
        else
                return (0);
}

/*
 * Update the expiration time of the root dir to be now plus the TTL.
 * Also establishes the TTL if not set.
 */
int
touchRootDir(void)
{
        struct timeval  now;
        int             ttl;

        (void) gettimeofday(&now, 0);

        /* Do we need to initialize the TTL ? */
        if (rootDirTtl == 0) {
                __nis_table_mapping_t   *t;

                t = __nis_find_item_mt(ROOTDIRFILE, &ldapMappingList, 0, 0);
                if (t != 0) {
                        int     interval;

                        interval = t->initTtlHi - t->initTtlLo + 1;

                        if (interval > 1) {
                                srand48(now.tv_sec);
                                ttl = (lrand48() % interval);
                        } else {
                                ttl = t->initTtlLo;
                        }

                        rootDirTtl = t->ttl;
                } else {
                        ttl = rootDirTtl = 3600;
                }
        } else {
                ttl = rootDirTtl;
        }

        rootDirExpire = now.tv_sec + ttl;

        return (0);
}