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      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 }
    110