/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*      All Rights Reserved     */

#include        <sys/types.h>
#include        <sys/stat.h>
#include        <stdio.h>
#include        <unistd.h>
#include        <userdefs.h>

#define GRPTMP          "/etc/gtmp"
#define GRPBUFSIZ       5120

int
add_group(group, gid)
char *group;    /* name of group to add */
gid_t gid;              /* gid of group to add */
{
        FILE *etcgrp;           /* /etc/group file */
        FILE *etctmp;           /* temp file */
        int o_mask;             /* old umask value */
        int newdone = 0;        /* set true when new entry done */
        struct stat sb;         /* stat buf to copy modes */
        char buf[GRPBUFSIZ];

        if ((etcgrp = fopen(GROUP, "r")) == NULL) {
                return (EX_UPDATE);
        }

        if (fstat(fileno(etcgrp), &sb) < 0) {
                /* If we can't get mode, take a default */
                sb.st_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
        }

        o_mask = umask(077);
        etctmp = fopen(GRPTMP, "w+");
        (void) umask(o_mask);

        if (etctmp == NULL) {
                fclose(etcgrp);
                return (EX_UPDATE);
        }

        if (fchmod(fileno(etctmp), sb.st_mode) != 0 ||
            fchown(fileno(etctmp), sb.st_uid, sb.st_gid) != 0 ||
            lockf(fileno(etctmp), F_LOCK, 0) != 0) {
                fclose(etcgrp);
                fclose(etctmp);
                unlink(GRPTMP);
                return (EX_UPDATE);
        }

        while (fgets(buf, GRPBUFSIZ, etcgrp) != NULL) {
                /* Check for NameService reference */
                if (!newdone && (buf[0] == '+' || buf[0] == '-')) {
                        (void) fprintf(etctmp, "%s::%u:\n", group, gid);
                        newdone = 1;
                }

                fputs(buf, etctmp);
        }


        (void) fclose(etcgrp);

        if (!newdone) {
                (void) fprintf(etctmp, "%s::%u:\n", group, gid);
        }

        if (rename(GRPTMP, GROUP) < 0) {
                fclose(etctmp);
                unlink(GRPTMP);
                return (EX_UPDATE);
        }

        (void) fclose(etctmp);


        return (EX_SUCCESS);
}