files/common/getgrent.c

	getgrent.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * 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) 1988-1995 Sun Microsystems Inc
 *  All Rights Reserved.
 *
 *  files/getgrent.c -- "files" backend for nsswitch "group" database
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <grp.h>
#include <unistd.h>     /* for GF_PATH */
#include "files_common.h"
#include <strings.h>

static u_int
hash_grname(nss_XbyY_args_t *argp, int keyhash)
{
    struct group *g = argp->returnval;
    const char *name = keyhash ? argp->key.name : g->gr_name;
    u_int hash = 0;

    while (*name != 0)
        hash = hash * 15 + *name++;

    return (hash);
}

static u_int
hash_grgid(nss_XbyY_args_t *argp, int keyhash)
{
    struct group *g = argp->returnval;
    return (keyhash ? (u_int)argp->key.gid : (u_int)g->gr_gid);
}

static files_hash_func hash_gr[2] = { hash_grname, hash_grgid };

static files_hash_t hashinfo = {
    DEFAULTMUTEX,
    sizeof (struct group),
    NSS_BUFLEN_GROUP,
    2,
    hash_gr
};

static int
check_grname(argp)
    nss_XbyY_args_t     *argp;
{
    struct group        *g = (struct group *)argp->returnval;

    /* +/- entries only valid in compat source */
    if (g->gr_name != 0 && (g->gr_name[0] == '+' || g->gr_name[0] == '-'))
        return (0);
    return (strcmp(g->gr_name, argp->key.name) == 0);
}

static nss_status_t
getbyname(be, a)
    files_backend_ptr_t be;
    void            *a;
{
    return (_nss_files_XY_hash(be, a, 0, &hashinfo, 0, check_grname));
}

static int
check_grgid(argp)
    nss_XbyY_args_t     *argp;
{
    struct group        *g = (struct group *)argp->returnval;

    /* +/- entries only valid in compat source */
    if (g->gr_name != 0 && (g->gr_name[0] == '+' || g->gr_name[0] == '-'))
        return (0);
    return (g->gr_gid == argp->key.gid);
}

static nss_status_t
getbygid(be, a)
    files_backend_ptr_t be;
    void            *a;
{
    return (_nss_files_XY_hash(be, a, 0, &hashinfo, 1, check_grgid));
}

static nss_status_t
getbymember(be, a)
    files_backend_ptr_t be;
    void            *a;
{
    struct nss_groupsbymem  *argp = (struct nss_groupsbymem *) a;

    return (_nss_files_do_all(be, argp, argp->username,
                (files_do_all_func_t)argp->process_cstr));
}

static files_backend_op_t group_ops[] = {
    _nss_files_destr,
    _nss_files_endent,
    _nss_files_setent,
    _nss_files_getent_rigid,
    getbyname,
    getbygid,
    getbymember
};

/*ARGSUSED*/
nss_backend_t *
_nss_files_group_constr(dummy1, dummy2, dummy3)
    const char  *dummy1, *dummy2, *dummy3;
{
    return (_nss_files_constr(group_ops,
                sizeof (group_ops) / sizeof (group_ops[0]),
                GF_PATH,
                NSS_LINELEN_GROUP,
                &hashinfo));
}