usr/src/cmd/oamuser/group/mod_group.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 #include <sys/types.h>
  34 #include <stdio.h>
  35 #include <ctype.h>
  36 #include <grp.h>
  37 #include <sys/stat.h>
  38 #include <unistd.h>
  39 #include <userdefs.h>
  40 #include <strings.h>
  41 #include <stdlib.h>
  42 #include "users.h"
  43 #include "messages.h"
  44
  45 /* lint error-killers: */
  46 void errmsg(int, int);
  47
  48 /* Modify group to new gid and/or new name */
  49 int
  50 mod_group(char *group, gid_t gid, char *newgroup)
  51 {
  52         int modified = 0;
  53         int fd;
  54         char tname[] = "/etc/gtmp.XXXXXX";
  55         FILE *e_fptr, *t_fptr;
  56         struct group *g_ptr;
  57         struct stat sbuf;
  58         boolean_t haserr;
  59         int line = 1;
  60
  61         if ((e_fptr = fopen(GROUP, "r")) == NULL)
  62                 return (EX_UPDATE);
  63
  64         if (fstat(fileno(e_fptr), &sbuf) != 0)
  65                 return (EX_UPDATE);
  66
  67         if ((fd = mkstemp(tname)) == -1)
  68                 return (EX_UPDATE);
  69
  70         if ((t_fptr = fdopen(fd, "w")) == NULL) {
  71                 (void) close(fd);
  72                 (void) unlink(tname);
  73                 return (EX_UPDATE);
  74         }
  75
  76         /*
  77          * Get ownership and permissions correct
  78          */
  79
  80         if (fchmod(fd, sbuf.st_mode) != 0 ||
  81             fchown(fd, sbuf.st_uid, sbuf.st_gid) != 0) {
  82                 (void) fclose(t_fptr);
  83                 (void) unlink(tname);
  84                 return (EX_UPDATE);
  85         }
  86
  87         while ((g_ptr = fgetgrent(e_fptr)) != NULL) {
  88
  89                 /* check to see if group is one to modify */
  90                 if (strcmp(g_ptr->gr_name, group) == 0) {
  91                         if (newgroup != NULL)
  92                                 g_ptr->gr_name = newgroup;
  93                         if (gid != -1)
  94                                 g_ptr->gr_gid = gid;
  95                         modified++;
  96                 }
  97                 putgrent(g_ptr, t_fptr);
  98                 line++;
  99         }
 100
 101         haserr = !feof(e_fptr);
 102         if (haserr)
 103                 errmsg(M_SYNTAX, line);
 104
 105         (void) fclose(e_fptr);
 106
 107         if (fclose(t_fptr) != 0 || haserr) {
 108                 /* GROUP file contains bad entries or write failed. */
 109                 (void) unlink(tname);
 110                 return (EX_UPDATE);
 111         }
 112
 113         if (modified) {
 114                 if (rename(tname, GROUP) != 0) {
 115                         (void) unlink(tname);
 116                         return (EX_UPDATE);
 117                 }
 118                 return (EX_SUCCESS);
 119         } else {
 120                 (void) unlink(tname);
 121                 return (EX_NAME_NOT_EXIST);
 122         }
 123 }