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
47 struct 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
63 struct 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
78 struct 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
98 static void
convert_label(const void * label,size_t labellen,char * label_out,size_t label_sz)99 convert_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
131 int
fstyp_ntfs(FILE * fp,char * label,size_t size)132 fstyp_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
179 ok:
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
191 fail:
192 free(bf);
193 free(filerecp);
194
195 return (1);
196 }
197