1/*-
2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * Copyright (c) 2006 Tobias Reifenberger
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * Copyright (c) 2006 Tobias Reifenberger
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
|
29__FBSDID("$FreeBSD: head/sys/geom/label/g_label_msdosfs.c 161246 2006-08-12 15:34:15Z pjd $");
| 29__FBSDID("$FreeBSD: head/sys/geom/label/g_label_msdosfs.c 162834 2006-09-30 08:16:49Z pjd $");
|
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>
35
36#include <geom/geom.h>
37#include <geom/label/g_label.h>
38#include <geom/label/g_label_msdosfs.h>
39
40#define G_LABEL_MSDOSFS_DIR "msdosfs"
41#define LABEL_NO_NAME "NO NAME "
42
43static void
44g_label_msdosfs_taste(struct g_consumer *cp, char *label, size_t size)
45{
46 struct g_provider *pp;
47 FAT_BSBPB *pfat_bsbpb;
48 FAT32_BSBPB *pfat32_bsbpb;
49 FAT_DES *pfat_entry;
50 uint8_t *sector0, *sector;
51 uint32_t i;
52
53 g_topology_assert_not();
54 pp = cp->provider;
55 sector0 = NULL;
56 sector = NULL;
57 bzero(label, size);
58
59 /* Check if the sector size of the medium is a valid FAT sector size. */
60 switch(pp->sectorsize) {
61 case 512:
62 case 1024:
63 case 2048:
64 case 4096:
65 break;
66 default:
67 G_LABEL_DEBUG(1, "MSDOSFS: %s: sector size %d not compatible.",
68 pp->name, pp->sectorsize);
69 return;
70 }
71
72 /* Load 1st sector with boot sector and boot parameter block. */
73 sector0 = (uint8_t *)g_read_data(cp, 0, pp->sectorsize, NULL);
74 if (sector0 == NULL)
75 return;
76
77 /* Check for the FAT boot sector signature. */
78 if (sector0[510] != 0x55 || sector0[511] != 0xaa) {
79 G_LABEL_DEBUG(1, "MSDOSFS: %s: no FAT signature found.",
80 pp->name);
81 goto error;
82 }
83
84
85 /*
86 * Test if this is really a FAT volume and determine the FAT type.
87 */
88
89 pfat_bsbpb = (FAT_BSBPB *)sector0;
90 pfat32_bsbpb = (FAT32_BSBPB *)sector0;
91
92 if (UINT16BYTES(pfat_bsbpb->BPB_FATSz16) != 0) {
93 /*
94 * If the BPB_FATSz16 field is not zero and the string "FAT" is
95 * at the right place, this should be a FAT12 or FAT16 volume.
96 */
97 if (strncmp(pfat_bsbpb->BS_FilSysType, "FAT", 3) != 0) {
98 G_LABEL_DEBUG(1,
99 "MSDOSFS: %s: FAT12/16 volume not valid.",
100 pp->name);
101 goto error;
102 }
103 G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT12/FAT16 volume detected.",
104 pp->name);
105
106 /* A volume with no name should have "NO NAME " as label. */
107 if (strncmp(pfat_bsbpb->BS_VolLab, LABEL_NO_NAME,
108 sizeof(pfat_bsbpb->BS_VolLab)) == 0) {
109 G_LABEL_DEBUG(1,
110 "MSDOSFS: %s: FAT12/16 volume has no name.",
111 pp->name);
112 goto error;
113 }
114 strlcpy(label, pfat_bsbpb->BS_VolLab,
115 MIN(size, sizeof(pfat_bsbpb->BS_VolLab) + 1));
116 } else if (UINT32BYTES(pfat32_bsbpb->BPB_FATSz32) != 0) {
117 uint32_t fat_FirstDataSector, fat_BytesPerSector, offset;
118
119 /*
120 * If the BPB_FATSz32 field is not zero and the string "FAT" is
121 * at the right place, this should be a FAT32 volume.
122 */
123 if (strncmp(pfat32_bsbpb->BS_FilSysType, "FAT", 3) != 0) {
124 G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT32 volume not valid.",
125 pp->name);
126 goto error;
127 }
128 G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT32 volume detected.",
129 pp->name);
130
131 /*
132 * If the volume label is not "NO NAME " we're done.
133 */
134 if (strncmp(pfat32_bsbpb->BS_VolLab, LABEL_NO_NAME,
135 sizeof(pfat32_bsbpb->BS_VolLab)) != 0) {
136 strlcpy(label, pfat32_bsbpb->BS_VolLab,
137 MIN(size, sizeof(pfat32_bsbpb->BS_VolLab) + 1));
138 goto endofchecks;
139 }
140
141 /*
142 * If the volume label "NO NAME " is in the boot sector, the
143 * label of FAT32 volumes may be stored as a special entry in
144 * the root directory.
145 */
146 fat_FirstDataSector =
147 UINT16BYTES(pfat32_bsbpb->BPB_RsvdSecCnt) +
148 (pfat32_bsbpb->BPB_NumFATs *
149 UINT32BYTES(pfat32_bsbpb->BPB_FATSz32));
150 fat_BytesPerSector = UINT16BYTES(pfat32_bsbpb->BPB_BytsPerSec);
| 30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>
35
36#include <geom/geom.h>
37#include <geom/label/g_label.h>
38#include <geom/label/g_label_msdosfs.h>
39
40#define G_LABEL_MSDOSFS_DIR "msdosfs"
41#define LABEL_NO_NAME "NO NAME "
42
43static void
44g_label_msdosfs_taste(struct g_consumer *cp, char *label, size_t size)
45{
46 struct g_provider *pp;
47 FAT_BSBPB *pfat_bsbpb;
48 FAT32_BSBPB *pfat32_bsbpb;
49 FAT_DES *pfat_entry;
50 uint8_t *sector0, *sector;
51 uint32_t i;
52
53 g_topology_assert_not();
54 pp = cp->provider;
55 sector0 = NULL;
56 sector = NULL;
57 bzero(label, size);
58
59 /* Check if the sector size of the medium is a valid FAT sector size. */
60 switch(pp->sectorsize) {
61 case 512:
62 case 1024:
63 case 2048:
64 case 4096:
65 break;
66 default:
67 G_LABEL_DEBUG(1, "MSDOSFS: %s: sector size %d not compatible.",
68 pp->name, pp->sectorsize);
69 return;
70 }
71
72 /* Load 1st sector with boot sector and boot parameter block. */
73 sector0 = (uint8_t *)g_read_data(cp, 0, pp->sectorsize, NULL);
74 if (sector0 == NULL)
75 return;
76
77 /* Check for the FAT boot sector signature. */
78 if (sector0[510] != 0x55 || sector0[511] != 0xaa) {
79 G_LABEL_DEBUG(1, "MSDOSFS: %s: no FAT signature found.",
80 pp->name);
81 goto error;
82 }
83
84
85 /*
86 * Test if this is really a FAT volume and determine the FAT type.
87 */
88
89 pfat_bsbpb = (FAT_BSBPB *)sector0;
90 pfat32_bsbpb = (FAT32_BSBPB *)sector0;
91
92 if (UINT16BYTES(pfat_bsbpb->BPB_FATSz16) != 0) {
93 /*
94 * If the BPB_FATSz16 field is not zero and the string "FAT" is
95 * at the right place, this should be a FAT12 or FAT16 volume.
96 */
97 if (strncmp(pfat_bsbpb->BS_FilSysType, "FAT", 3) != 0) {
98 G_LABEL_DEBUG(1,
99 "MSDOSFS: %s: FAT12/16 volume not valid.",
100 pp->name);
101 goto error;
102 }
103 G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT12/FAT16 volume detected.",
104 pp->name);
105
106 /* A volume with no name should have "NO NAME " as label. */
107 if (strncmp(pfat_bsbpb->BS_VolLab, LABEL_NO_NAME,
108 sizeof(pfat_bsbpb->BS_VolLab)) == 0) {
109 G_LABEL_DEBUG(1,
110 "MSDOSFS: %s: FAT12/16 volume has no name.",
111 pp->name);
112 goto error;
113 }
114 strlcpy(label, pfat_bsbpb->BS_VolLab,
115 MIN(size, sizeof(pfat_bsbpb->BS_VolLab) + 1));
116 } else if (UINT32BYTES(pfat32_bsbpb->BPB_FATSz32) != 0) {
117 uint32_t fat_FirstDataSector, fat_BytesPerSector, offset;
118
119 /*
120 * If the BPB_FATSz32 field is not zero and the string "FAT" is
121 * at the right place, this should be a FAT32 volume.
122 */
123 if (strncmp(pfat32_bsbpb->BS_FilSysType, "FAT", 3) != 0) {
124 G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT32 volume not valid.",
125 pp->name);
126 goto error;
127 }
128 G_LABEL_DEBUG(1, "MSDOSFS: %s: FAT32 volume detected.",
129 pp->name);
130
131 /*
132 * If the volume label is not "NO NAME " we're done.
133 */
134 if (strncmp(pfat32_bsbpb->BS_VolLab, LABEL_NO_NAME,
135 sizeof(pfat32_bsbpb->BS_VolLab)) != 0) {
136 strlcpy(label, pfat32_bsbpb->BS_VolLab,
137 MIN(size, sizeof(pfat32_bsbpb->BS_VolLab) + 1));
138 goto endofchecks;
139 }
140
141 /*
142 * If the volume label "NO NAME " is in the boot sector, the
143 * label of FAT32 volumes may be stored as a special entry in
144 * the root directory.
145 */
146 fat_FirstDataSector =
147 UINT16BYTES(pfat32_bsbpb->BPB_RsvdSecCnt) +
148 (pfat32_bsbpb->BPB_NumFATs *
149 UINT32BYTES(pfat32_bsbpb->BPB_FATSz32));
150 fat_BytesPerSector = UINT16BYTES(pfat32_bsbpb->BPB_BytsPerSec);
|
151
| 151
|
152 G_LABEL_DEBUG(2,
153 "MSDOSFS: FAT_FirstDataSector=0x%x, FAT_BytesPerSector=%d",
154 fat_FirstDataSector, fat_BytesPerSector);
155
156 for (offset = fat_BytesPerSector * fat_FirstDataSector;;
157 offset += fat_BytesPerSector) {
158 sector = (uint8_t *)g_read_data(cp, offset,
159 fat_BytesPerSector, NULL);
160 if (sector == NULL)
161 goto error;
162
163 pfat_entry = (FAT_DES *)sector;
164 do {
165 /* No more entries available. */
166 if (pfat_entry->DIR_Name[0] == 0) {
167 G_LABEL_DEBUG(1, "MSDOSFS: %s: "
168 "FAT32 volume has no name.",
169 pp->name);
170 goto error;
171 }
172
173 /* Skip empty or long name entries. */
174 if (pfat_entry->DIR_Name[0] == 0xe5 ||
175 (pfat_entry->DIR_Attr &
176 FAT_DES_ATTR_LONG_NAME) ==
177 FAT_DES_ATTR_LONG_NAME) {
178 continue;
179 }
180
181 /*
182 * The name of the entry is the volume label if
183 * ATTR_VOLUME_ID is set.
184 */
185 if (pfat_entry->DIR_Attr &
186 FAT_DES_ATTR_VOLUME_ID) {
187 strlcpy(label, pfat_entry->DIR_Name,
188 MIN(size,
189 sizeof(pfat_bsbpb->BS_VolLab) + 1));
190 goto endofchecks;
191 }
192 } while((uint8_t *)(++pfat_entry) <
193 (uint8_t *)(sector + fat_BytesPerSector));
194 g_free(sector);
195 }
196 } else {
197 G_LABEL_DEBUG(1, "MSDOSFS: %s: no FAT volume detected.",
198 pp->name);
199 goto error;
200 }
201
202endofchecks:
203 for (i = size - 1; i > 0; i--) {
204 if (label[i] == '\0')
205 continue;
206 else if (label[i] == ' ')
207 label[i] = '\0';
208 else
209 break;
210 }
211
212error:
213 if (sector0 != NULL)
214 g_free(sector0);
215 if (sector != NULL)
216 g_free(sector);
217}
218
219const struct g_label_desc g_label_msdosfs = {
220 .ld_taste = g_label_msdosfs_taste,
221 .ld_dir = G_LABEL_MSDOSFS_DIR
222};
| 152 G_LABEL_DEBUG(2,
153 "MSDOSFS: FAT_FirstDataSector=0x%x, FAT_BytesPerSector=%d",
154 fat_FirstDataSector, fat_BytesPerSector);
155
156 for (offset = fat_BytesPerSector * fat_FirstDataSector;;
157 offset += fat_BytesPerSector) {
158 sector = (uint8_t *)g_read_data(cp, offset,
159 fat_BytesPerSector, NULL);
160 if (sector == NULL)
161 goto error;
162
163 pfat_entry = (FAT_DES *)sector;
164 do {
165 /* No more entries available. */
166 if (pfat_entry->DIR_Name[0] == 0) {
167 G_LABEL_DEBUG(1, "MSDOSFS: %s: "
168 "FAT32 volume has no name.",
169 pp->name);
170 goto error;
171 }
172
173 /* Skip empty or long name entries. */
174 if (pfat_entry->DIR_Name[0] == 0xe5 ||
175 (pfat_entry->DIR_Attr &
176 FAT_DES_ATTR_LONG_NAME) ==
177 FAT_DES_ATTR_LONG_NAME) {
178 continue;
179 }
180
181 /*
182 * The name of the entry is the volume label if
183 * ATTR_VOLUME_ID is set.
184 */
185 if (pfat_entry->DIR_Attr &
186 FAT_DES_ATTR_VOLUME_ID) {
187 strlcpy(label, pfat_entry->DIR_Name,
188 MIN(size,
189 sizeof(pfat_bsbpb->BS_VolLab) + 1));
190 goto endofchecks;
191 }
192 } while((uint8_t *)(++pfat_entry) <
193 (uint8_t *)(sector + fat_BytesPerSector));
194 g_free(sector);
195 }
196 } else {
197 G_LABEL_DEBUG(1, "MSDOSFS: %s: no FAT volume detected.",
198 pp->name);
199 goto error;
200 }
201
202endofchecks:
203 for (i = size - 1; i > 0; i--) {
204 if (label[i] == '\0')
205 continue;
206 else if (label[i] == ' ')
207 label[i] = '\0';
208 else
209 break;
210 }
211
212error:
213 if (sector0 != NULL)
214 g_free(sector0);
215 if (sector != NULL)
216 g_free(sector);
217}
218
219const struct g_label_desc g_label_msdosfs = {
220 .ld_taste = g_label_msdosfs_taste,
221 .ld_dir = G_LABEL_MSDOSFS_DIR
222};
|