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 */
42blrange_t *
43getdevicerange(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