usr/src/lib/libbsm/common/getdevicerange.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #include <tsol/label.h>
  32 #include <bsm/devices.h>
  33
  34
  35 /*
  36  * getdevicerange
  37  *      Gets the minimum and maximum labels within which the device can
  38  *      be used. If label range is not specified for the device in
  39  *      device_allocate, defaults to admin_low and admin_high.
  40  *      Returns malloc'ed blrange pointer, or NULL on any error.
  41  */
  42 blrange_t *
  43 getdevicerange(const char *dev)
  44 {
  45         int             err;
  46         char            *lstr;
  47         devalloc_t      *da;
  48         devmap_t        *dm;
  49         blrange_t       *range;
  50
  51         errno = 0;
  52         if ((range = malloc(sizeof (blrange_t))) == NULL)
  53                 return (NULL);
  54         if ((range->lower_bound = blabel_alloc()) == NULL) {
  55                 free(range);
  56                 return (NULL);
  57         }
  58         if ((range->upper_bound = blabel_alloc()) == NULL) {
  59                 blabel_free(range->lower_bound);
  60                 free(range);
  61                 return (NULL);
  62         }
  63
  64         /*
  65          * If an entry is found for the named device,
  66          * return its label range.
  67          */
  68         setdaent();
  69         if ((da = getdanam((char *)dev)) == NULL) {
  70                 setdmapent();
  71                 /* check for an actual device file */
  72                 if ((dm = getdmapdev((char *)dev)) != NULL) {
  73                         da = getdanam(dm->dmap_devname);
  74                         freedmapent(dm);
  75                 }
  76                 enddmapent();
  77         }
  78         enddaent();
  79         if (da == NULL) {
  80                 bsllow(range->lower_bound);
  81                 bslhigh(range->upper_bound);
  82         } else {
  83                 lstr = kva_match(da->da_devopts, DAOPT_MINLABEL);
  84                 if (lstr == NULL) {
  85                         bsllow(range->lower_bound);
  86                 } else if (stobsl(lstr, range->lower_bound, NO_CORRECTION,
  87                     &err) == 0) {
  88                         blabel_free(range->lower_bound);
  89                         blabel_free(range->upper_bound);
  90                         free(range);
  91                         errno = ENOTSUP;
  92                         return (NULL);
  93                 }
  94                 lstr = kva_match(da->da_devopts, DAOPT_MAXLABEL);
  95                 if (lstr == NULL) {
  96                         bslhigh(range->upper_bound);
  97                 } else if (stobsl(lstr, range->upper_bound, NO_CORRECTION,
  98                     &err) == 0) {
  99                         blabel_free(range->lower_bound);
 100                         blabel_free(range->upper_bound);
 101                         free(range);
 102                         errno = ENOTSUP;
 103                         return (NULL);
 104                 }
 105                 freedaent(da);
 106         }
 107
 108         return (range);
 109 }