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 extern struct group *fgetgrent(FILE *);
  46
  47 /* lint error-killers: */
  48 void errmsg(int, int);
  49
  50 /* Modify group to new gid and/or new name */
  51 int
  52 mod_group(char *group, gid_t gid, char *newgroup)
  53 {
  54         int modified = 0;
  55         int fd;
  56         char tname[] = "/etc/gtmp.XXXXXX";
  57         FILE *e_fptr, *t_fptr;
  58         struct group *g_ptr;
  59         struct stat sbuf;
  60         boolean_t haserr;
  61         int line = 1;
  62
  63         if ((e_fptr = fopen(GROUP, "r")) == NULL)
  64                 return (EX_UPDATE);
  65
  66         if (fstat(fileno(e_fptr), &sbuf) != 0)
  67                 return (EX_UPDATE);
  68
  69         if ((fd = mkstemp(tname)) == -1)
  70                 return (EX_UPDATE);
  71
  72         if ((t_fptr = fdopen(fd, "w")) == NULL) {
  73                 (void) close(fd);
  74                 (void) unlink(tname);
  75                 return (EX_UPDATE);
  76         }
  77
  78         /*
  79          * Get ownership and permissions correct
  80          */
  81
  82         if (fchmod(fd, sbuf.st_mode) != 0 ||
  83             fchown(fd, sbuf.st_uid, sbuf.st_gid) != 0) {
  84                 (void) fclose(t_fptr);
  85                 (void) unlink(tname);
  86                 return (EX_UPDATE);
  87         }
  88
  89         while ((g_ptr = fgetgrent(e_fptr)) != NULL) {
  90
  91                 /* check to see if group is one to modify */
  92                 if (strcmp(g_ptr->gr_name, group) == 0) {
  93                         if (newgroup != NULL)
  94                                 g_ptr->gr_name = newgroup;
  95                         if (gid != -1)
  96                                 g_ptr->gr_gid = gid;
  97                         modified++;
  98                 }
  99                 putgrent(g_ptr, t_fptr);
 100                 line++;
 101         }
 102
 103         haserr = !feof(e_fptr);
 104         if (haserr)
 105                 errmsg(M_SYNTAX, line);
 106
 107         (void) fclose(e_fptr);
 108
 109         if (fclose(t_fptr) != 0 || haserr) {
 110                 /* GROUP file contains bad entries or write failed. */
 111                 (void) unlink(tname);
 112                 return (EX_UPDATE);
 113         }
 114
 115         if (modified) {
 116                 if (rename(tname, GROUP) != 0) {
 117                         (void) unlink(tname);
 118                         return (EX_UPDATE);
 119                 }
 120                 return (EX_SUCCESS);
 121         } else {
 122                 (void) unlink(tname);
 123                 return (EX_NAME_NOT_EXIST);
 124         }
 125 }