oamuser/group/mod_group.c

/*
 * 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 2004 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"

#include <sys/types.h>
#include <stdio.h>
#include <ctype.h>
#include <grp.h>
#include <sys/stat.h>
#include <unistd.h>
#include <userdefs.h>
#include <strings.h>
#include <stdlib.h>
#include "users.h"
#include "messages.h"

/* lint error-killers: */
void errmsg(int, int);

/* Modify group to new gid and/or new name */
int
mod_group(char *group, gid_t gid, char *newgroup)
{
    int modified = 0;
    int fd;
    char tname[] = "/etc/gtmp.XXXXXX";
    FILE *e_fptr, *t_fptr;
    struct group *g_ptr;
    struct stat sbuf;
    boolean_t haserr;
    int line = 1;

    if ((e_fptr = fopen(GROUP, "r")) == NULL)
        return (EX_UPDATE);

    if (fstat(fileno(e_fptr), &sbuf) != 0)
        return (EX_UPDATE);

    if ((fd = mkstemp(tname)) == -1)
        return (EX_UPDATE);

    if ((t_fptr = fdopen(fd, "w")) == NULL) {
        (void) close(fd);
        (void) unlink(tname);
        return (EX_UPDATE);
    }

    /*
     * Get ownership and permissions correct
     */

    if (fchmod(fd, sbuf.st_mode) != 0 ||
        fchown(fd, sbuf.st_uid, sbuf.st_gid) != 0) {
        (void) fclose(t_fptr);
        (void) unlink(tname);
        return (EX_UPDATE);
    }

    while ((g_ptr = fgetgrent(e_fptr)) != NULL) {

        /* check to see if group is one to modify */
        if (strcmp(g_ptr->gr_name, group) == 0) {
            if (newgroup != NULL)
                g_ptr->gr_name = newgroup;
            if (gid != -1)
                g_ptr->gr_gid = gid;
            modified++;
        }
        putgrent(g_ptr, t_fptr);
        line++;
    }

    haserr = !feof(e_fptr);
    if (haserr)
        errmsg(M_SYNTAX, line);

    (void) fclose(e_fptr);

    if (fclose(t_fptr) != 0 || haserr) {
        /* GROUP file contains bad entries or write failed. */
        (void) unlink(tname);
        return (EX_UPDATE);
    }

    if (modified) {
        if (rename(tname, GROUP) != 0) {
            (void) unlink(tname);
            return (EX_UPDATE);
        }
        return (EX_SUCCESS);
    } else {
        (void) unlink(tname);
        return (EX_NAME_NOT_EXIST);
    }
}