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("$FreeBSD$");
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 struct ntfs_attr {
46 uint32_t a_type;
47 uint32_t reclen;
48 uint8_t a_flag;
49 uint8_t a_namelen;
50 uint8_t a_nameoff;
51 uint8_t reserved1;
52 uint8_t a_compression;
53 uint8_t reserved2;
54 uint16_t a_index;
55 uint16_t a_datalen;
56 uint16_t reserved3;
57 uint16_t a_dataoff;
58 uint16_t a_indexed;
59 } __packed;
60
61 struct ntfs_filerec {
62 uint32_t fr_hdrmagic;
63 uint16_t fr_hdrfoff;
64 uint16_t fr_hdrfnum;
65 uint8_t reserved[8];
66 uint16_t fr_seqnum;
67 uint16_t fr_nlink;
68 uint16_t fr_attroff;
69 uint16_t fr_flags;
70 uint32_t fr_size;
71 uint32_t fr_allocated;
72 uint64_t fr_mainrec;
73 uint16_t fr_attrnum;
74 } __packed;
75
76 struct ntfs_bootfile {
77 uint8_t reserved1[3];
78 uint8_t bf_sysid[8];
79 uint16_t bf_bps;
80 uint8_t bf_spc;
81 uint8_t reserved2[7];
82 uint8_t bf_media;
83 uint8_t reserved3[2];
84 uint16_t bf_spt;
85 uint16_t bf_heads;
86 uint8_t reserver4[12];
87 uint64_t bf_spv;
88 uint64_t bf_mftcn;
89 uint64_t bf_mftmirrcn;
90 int8_t bf_mftrecsz;
91 uint32_t bf_ibsz;
92 uint32_t bf_volsn;
93 } __packed;
94
95 int
fstyp_ntfs(FILE * fp,char * label,size_t size)96 fstyp_ntfs(FILE *fp, char *label, size_t size)
97 {
98 struct ntfs_bootfile *bf;
99 struct ntfs_filerec *fr;
100 struct ntfs_attr *atr;
101 off_t voloff;
102 char *filerecp, *ap;
103 int8_t mftrecsz;
104 char vnchar;
105 int recsize, j;
106
107 filerecp = NULL;
108
109 bf = (struct ntfs_bootfile *)read_buf(fp, 0, 512);
110 if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0)
111 goto fail;
112
113 mftrecsz = bf->bf_mftrecsz;
114 recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
115
116 voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
117 recsize * NTFS_VOLUMEINO;
118
119 filerecp = read_buf(fp, voloff, recsize);
120 if (filerecp == NULL)
121 goto fail;
122 fr = (struct ntfs_filerec *)filerecp;
123
124 if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
125 goto fail;
126
127 for (ap = filerecp + fr->fr_attroff;
128 atr = (struct ntfs_attr *)ap, (int)atr->a_type != -1;
129 ap += atr->reclen) {
130 if (atr->a_type == NTFS_A_VOLUMENAME) {
131 if(atr->a_datalen >= size *2){
132 goto fail;
133 }
134 /*
135 *UNICODE to ASCII.
136 * Should we need to use iconv(9)?
137 */
138 for (j = 0; j < atr->a_datalen; j++) {
139 vnchar = *(ap + atr->a_dataoff + j);
140 if (j & 1) {
141 if (vnchar) {
142 goto fail;
143 }
144 } else {
145 label[j / 2] = vnchar;
146 }
147 }
148 label[j / 2] = 0;
149 break;
150 }
151 }
152
153 free(bf);
154 free(filerecp);
155
156 return (0);
157
158 fail:
159 free(bf);
160 free(filerecp);
161
162 return (1);
163 }
164