ntfs.c revision 275680 
1/*-
2 * Copyright (c) 2005 Takanori Watanabe
3 * Copyright (c) 2014 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: head/usr.sbin/fstyp/ntfs.c 275680 2014-12-10 14:14:16Z trasz $");
33
34#include <stdint.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38
39#include "fstyp.h"
40
41#define	NTFS_A_VOLUMENAME	0x60
42#define	NTFS_FILEMAGIC		((uint32_t)(0x454C4946))
43#define	NTFS_VOLUMEINO		3
44
45#define G_LABEL_NTFS_DIR	"ntfs"
46
47struct ntfs_attr {
48	uint32_t	a_type;
49	uint32_t	reclen;
50	uint8_t		a_flag;
51	uint8_t		a_namelen;
52	uint8_t		a_nameoff;
53	uint8_t		reserved1;
54	uint8_t		a_compression;
55	uint8_t		reserved2;
56	uint16_t	a_index;
57	uint16_t	a_datalen;
58	uint16_t	reserved3;
59	uint16_t	a_dataoff;
60	uint16_t	a_indexed;
61} __packed;
62
63struct ntfs_filerec {
64	uint32_t	fr_hdrmagic;
65	uint16_t	fr_hdrfoff;
66	uint16_t	fr_hdrfnum;
67	uint8_t		reserved[8];
68	uint16_t	fr_seqnum;
69	uint16_t	fr_nlink;
70	uint16_t	fr_attroff;
71	uint16_t	fr_flags;
72	uint32_t	fr_size;
73	uint32_t	fr_allocated;
74	uint64_t	fr_mainrec;
75	uint16_t	fr_attrnum;
76} __packed;
77
78struct ntfs_bootfile {
79	uint8_t		reserved1[3];
80	uint8_t		bf_sysid[8];
81	uint16_t	bf_bps;
82	uint8_t		bf_spc;
83	uint8_t		reserved2[7];
84	uint8_t		bf_media;
85	uint8_t		reserved3[2];
86	uint16_t	bf_spt;
87	uint16_t	bf_heads;
88	uint8_t		reserver4[12];
89	uint64_t	bf_spv;
90	uint64_t	bf_mftcn;
91	uint64_t	bf_mftmirrcn;
92	int8_t		bf_mftrecsz;
93	uint32_t	bf_ibsz;
94	uint32_t	bf_volsn;
95} __packed;
96
97int
98fstyp_ntfs(FILE *fp, char *label, size_t size)
99{
100	struct ntfs_bootfile *bf;
101	struct ntfs_filerec *fr;
102	struct ntfs_attr *atr;
103	off_t voloff;
104	char *filerecp, *ap;
105	int8_t mftrecsz;
106	char vnchar;
107	int recsize, j;
108
109	filerecp = NULL;
110
111	bf = (struct ntfs_bootfile *)read_buf(fp, 0, 512);
112	if (bf == NULL || strncmp(bf->bf_sysid, "NTFS    ", 8) != 0)
113		return (1);
114
115	mftrecsz = bf->bf_mftrecsz;
116	recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
117
118	voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
119	    recsize * NTFS_VOLUMEINO;
120
121	filerecp = read_buf(fp, voloff, recsize);
122	if (filerecp == NULL)
123		goto fail;
124	fr = (struct ntfs_filerec *)filerecp;
125
126	if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
127		goto fail;
128
129	for (ap = filerecp + fr->fr_attroff;
130	    atr = (struct ntfs_attr *)ap, (int)atr->a_type != -1;
131	    ap += atr->reclen) {
132		if (atr->a_type == NTFS_A_VOLUMENAME) {
133			if(atr->a_datalen >= size *2){
134				goto fail;
135			}
136			/*
137			 *UNICODE to ASCII.
138			 * Should we need to use iconv(9)?
139			 */
140			for (j = 0; j < atr->a_datalen; j++) {
141				vnchar = *(ap + atr->a_dataoff + j);
142				if (j & 1) {
143					if (vnchar) {
144						goto fail;
145					}
146				} else {
147					label[j / 2] = vnchar;
148				}
149			}
150			label[j / 2] = 0;
151			break;
152		}
153	}
154
155	free(bf);
156	free(filerecp);
157
158	return (0);
159
160fail:
161	free(bf);
162	free(filerecp);
163
164	return (1);
165}
166