1/*-
2 * Copyright (c) 2005 Takanori Watanabe
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/malloc.h>
34
35#include <fs/ntfs/ntfs.h>
36
37#include <geom/geom.h>
38#include <geom/label/g_label.h>
39
40#define G_LABEL_NTFS_DIR	"ntfs"
41
42
43static void
44g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size)
45{
46	struct g_provider *pp;
47	struct bootfile *bf;
48	struct filerec *fr;
49	struct attr *atr;
50	off_t voloff;
51	char *filerecp, *ap;
52	char mftrecsz, vnchar;
53	int recsize, j;
54
55	g_topology_assert_not();
56
57	label[0] = '\0';
58	pp = cp->provider;
59	filerecp = NULL;
60
61	bf = (struct bootfile *)g_read_data(cp, 0, pp->sectorsize, NULL);
62	if (bf == NULL || strncmp(bf->bf_sysid, "NTFS    ", 8) != 0)
63		goto done;
64
65	mftrecsz = (char)bf->bf_mftrecsz;
66	recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
67	if (recsize % pp->sectorsize != 0)
68		goto done;
69
70	voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
71	    recsize * NTFS_VOLUMEINO;
72	if (voloff % pp->sectorsize != 0)
73		goto done;
74
75	filerecp = g_read_data(cp, voloff, recsize, NULL);
76	if (filerecp == NULL)
77		goto done;
78	fr = (struct filerec *)filerecp;
79
80	if (fr->fr_fixup.fh_magic != NTFS_FILEMAGIC)
81		goto done;
82
83	for (ap = filerecp + fr->fr_attroff;
84	    atr = (struct attr *)ap, atr->a_hdr.a_type != -1;
85	    ap += atr->a_hdr.reclen) {
86		if (atr->a_hdr.a_type == NTFS_A_VOLUMENAME) {
87			if(atr->a_r.a_datalen >= size *2){
88				label[0] = 0;
89				goto done;
90			}
91			/*
92			 *UNICODE to ASCII.
93			 * Should we need to use iconv(9)?
94			 */
95			for (j = 0; j < atr->a_r.a_datalen; j++) {
96				vnchar = *(ap + atr->a_r.a_dataoff + j);
97				if (j & 1) {
98					if (vnchar) {
99						label[0] = 0;
100						goto done;
101					}
102				} else {
103					label[j / 2] = vnchar;
104				}
105			}
106			label[j / 2] = 0;
107			break;
108		}
109	}
110done:
111	if (bf != NULL)
112		g_free(bf);
113	if (filerecp != NULL)
114		g_free(filerecp);
115}
116
117struct g_label_desc g_label_ntfs = {
118	.ld_taste = g_label_ntfs_taste,
119	.ld_dir = G_LABEL_NTFS_DIR,
120	.ld_enabled = 1
121};
122
123G_LABEL_INIT(ntfs, g_label_ntfs, "Create device nodes for NTFS volumes");
124