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#include <err.h>
33#ifdef WITH_ICONV
34#include <iconv.h>
35#endif
36#include <stdint.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include "fstyp.h"
42
43#define	NTFS_A_VOLUMENAME	0x60
44#define	NTFS_FILEMAGIC		((uint32_t)(0x454C4946))
45#define	NTFS_VOLUMEINO		3
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
97#ifdef WITH_ICONV
98static void
99convert_label(const void *label /* LE */, size_t labellen, char *label_out,
100    size_t label_sz)
101{
102	char *label_out_orig;
103	iconv_t cd;
104	size_t rc;
105
106	/* dstname="" means convert to the current locale. */
107	cd = iconv_open("", NTFS_ENC);
108	if (cd == (iconv_t)-1) {
109		warn("ntfs: Could not open iconv");
110		return;
111	}
112
113	label_out_orig = label_out;
114
115	rc = iconv(cd, __DECONST(char **, &label), &labellen, &label_out,
116	    &label_sz);
117	if (rc == (size_t)-1) {
118		warn("ntfs: iconv()");
119		*label_out_orig = '\0';
120	} else {
121		/* NUL-terminate result (iconv advances label_out). */
122		if (label_sz == 0)
123			label_out--;
124		*label_out = '\0';
125	}
126
127	iconv_close(cd);
128}
129#endif
130
131int
132fstyp_ntfs(FILE *fp, char *label, size_t size)
133{
134	struct ntfs_bootfile *bf;
135	char *filerecp;
136#ifdef WITH_ICONV
137	struct ntfs_filerec *fr;
138	struct ntfs_attr *atr;
139	off_t voloff;
140	char *ap;
141	int8_t mftrecsz;
142	int recsize;
143#endif /* WITH_ICONV */
144
145	filerecp = NULL;
146
147	bf = (struct ntfs_bootfile *)read_buf(fp, 0, 512);
148	if (bf == NULL || strncmp(bf->bf_sysid, "NTFS    ", 8) != 0)
149		goto fail;
150#ifdef WITH_ICONV
151	if (!show_label)
152		goto ok;
153
154	mftrecsz = bf->bf_mftrecsz;
155	recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
156
157	voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
158	    recsize * NTFS_VOLUMEINO;
159
160	filerecp = read_buf(fp, voloff, recsize);
161	if (filerecp == NULL)
162		goto fail;
163	fr = (struct ntfs_filerec *)filerecp;
164
165	if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
166		goto fail;
167
168	for (ap = filerecp + fr->fr_attroff;
169	    atr = (struct ntfs_attr *)ap, (int)atr->a_type != -1;
170	    ap += atr->reclen) {
171		if (atr->a_type != NTFS_A_VOLUMENAME)
172			continue;
173
174		convert_label(ap + atr->a_dataoff,
175		    atr->a_datalen, label, size);
176		break;
177	}
178
179ok:
180#else
181	if (show_label) {
182		warnx("label not available without iconv support");
183		memset(label, 0, size);
184	}
185#endif /* WITH_ICONV */
186	free(bf);
187	free(filerecp);
188
189	return (0);
190
191fail:
192	free(bf);
193	free(filerecp);
194
195	return (1);
196}
197