oamuser/group/add_group.c

	add_group.c revision f48205be61a214698b763ff550ab9e657525104c
/*
 * 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 */


#pragma ident   "%Z%%M% %I% %E% SMI"    /* SVr4.0 1.3 */

#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);
}