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pwcache.h

/**   $MirOS: src/usr.sbin/makefs/nbsrc/lib/libc/gen/pwcache.h,v 1.8 2009/07/23 19:32:25 tg Exp $ */
/*    $NetBSD: pwcache.h,v 1.5 2003/11/10 08:51:51 wiz Exp $      */

/*-
 * Copyright (c) 2009 Thorsten Glaser.
 * Copyright (c) 1992 Keith Muller.
 * Copyright (c) 1992, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)cache.h     8.1 (Berkeley) 5/31/93
 */

/*
 * Constants and data structures used to implement group and password file
 * caches. Traditional passwd/group cache routines perform quite poorly with
 * archives. The chances of hitting a valid lookup with an archive is quite a
 * bit worse than with files already resident on the file system. These misses
 * create a MAJOR performance cost. To address this problem, these routines
 * cache both hits and misses.
 *
 * NOTE:  name lengths must be as large as those stored in ANY PROTOCOL and
 * as stored in the passwd and group files. CACHE SIZES MUST BE PRIME
 */
#define UNMLEN          32    /* >= user name found in any protocol */
#define GNMLEN          32    /* >= group name found in any protocol */
#define UID_SZ          317   /* size of uid to user_name cache */
#define UNM_SZ          317   /* size of user_name to uid cache */
#define GID_SZ          251   /* size of gid to group_name cache */
#define GNM_SZ          251   /* size of group_name to gid cache */
#define VALID           1     /* entry and name are valid */
#define INVALID         2     /* entry valid, name NOT valid */

/*
 * Node structures used in the user, group, uid, and gid caches.
 */

typedef struct uidc {
      int valid;        /* is this a valid or a miss entry */
      char name[UNMLEN];      /* uid name */
      uid_t uid;        /* cached uid */
} UIDC;

typedef struct gidc {
      int valid;        /* is this a valid or a miss entry */
      char name[GNMLEN];      /* gid name */
      gid_t gid;        /* cached gid */
} GIDC;

#if defined(__MirBSD__) || defined(DEBIAN)
const char *__nbcompat_user_from_uid(uid_t uid, int noname);
const char *__nbcompat_group_from_gid(gid_t gid, int noname);
int uid_from_user(const char *name, uid_t *uid);
int gid_from_group(const char *name, gid_t *gid);
int pwcache_userdb(
      int         (*a_setpassent)(int),
      void        (*a_endpwent)(void),
      struct passwd *   (*a_getpwnam)(const char *),
      struct passwd *   (*a_getpwuid)(uid_t));
int pwcache_groupdb(
      int         (*a_setgroupent)(int),
      void        (*a_endgrent)(void),
      struct group *    (*a_getgrnam)(const char *),
      struct group *    (*a_getgrgid)(gid_t));

#define user_from_uid __nbcompat_user_from_uid
#define group_from_gid __nbcompat_group_from_gid
#endif

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