1 /*-
2 * Copyright (c) 2016 The DragonFly Project
3 * Copyright (c) 2005 Takanori Watanabe
4 * Copyright (c) 2014 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Edward Tomasz Napierala under sponsorship
8 * from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <err.h>
33 #include <iconv.h>
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 static void
convert_label(const void * label,size_t labellen,char * label_out,size_t label_sz)96 convert_label(const void *label /* LE */, size_t labellen, char *label_out,
97 size_t label_sz)
98 {
99 char *label_out_orig;
100 iconv_t cd;
101 size_t rc;
102
103 /* dstname="" means convert to the current locale. */
104 cd = iconv_open("", NTFS_ENC);
105 if (cd == (iconv_t)-1) {
106 warn("ntfs: Could not open iconv");
107 return;
108 }
109
110 label_out_orig = label_out;
111
112 rc = iconv(cd, __DECONST(char **, &label), &labellen, &label_out,
113 &label_sz);
114 if (rc == (size_t)-1) {
115 warn("ntfs: iconv()");
116 *label_out_orig = '\0';
117 } else {
118 /* NUL-terminate result (iconv advances label_out). */
119 if (label_sz == 0)
120 label_out--;
121 *label_out = '\0';
122 }
123
124 iconv_close(cd);
125 }
126
127 int
fstyp_ntfs(FILE * fp,char * label,size_t size,const char * devpath)128 fstyp_ntfs(FILE *fp, char *label, size_t size, const char *devpath)
129 {
130 struct ntfs_bootfile *bf;
131 struct ntfs_filerec *fr;
132 struct ntfs_attr *atr;
133 off_t voloff;
134 char *filerecp, *ap;
135 int8_t mftrecsz;
136 int recsize;
137
138 filerecp = NULL;
139
140 bf = (struct ntfs_bootfile *)read_buf(fp, 0, 512);
141 if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0)
142 goto fail;
143 if (!show_label)
144 goto ok;
145
146 mftrecsz = bf->bf_mftrecsz;
147 recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
148
149 voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
150 recsize * NTFS_VOLUMEINO;
151
152 filerecp = read_buf(fp, voloff, recsize);
153 if (filerecp == NULL)
154 goto fail;
155 fr = (struct ntfs_filerec *)filerecp;
156
157 if (fr->fr_hdrmagic != NTFS_FILEMAGIC)
158 goto fail;
159
160 for (ap = filerecp + fr->fr_attroff;
161 atr = (struct ntfs_attr *)ap, (int)atr->a_type != -1;
162 ap += atr->reclen) {
163 if (atr->a_type != NTFS_A_VOLUMENAME)
164 continue;
165
166 convert_label(ap + atr->a_dataoff,
167 atr->a_datalen, label, size);
168 break;
169 }
170
171 ok:
172 free(bf);
173 free(filerecp);
174
175 return (0);
176
177 fail:
178 free(bf);
179 free(filerecp);
180
181 return (1);
182 }
183