summaryrefslogtreecommitdiffstats
path: root/dump/dump.c
blob: 3d77bb9b094d1f3fc31585ba89b75647f48025d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2021 Namjae Jeon <linkinjeon@kernel.org>
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <locale.h>
#include <inttypes.h>

#include "exfat_ondisk.h"
#include "libexfat.h"

#define EXFAT_MIN_SECT_SIZE_BITS		9
#define EXFAT_MAX_SECT_SIZE_BITS		12
#define BITS_PER_BYTE				8
#define BITS_PER_BYTE_MASK			0x7

static const unsigned char used_bit[] = {
	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3,/*  0 ~  19*/
	2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4,/* 20 ~  39*/
	2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5,/* 40 ~  59*/
	4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,/* 60 ~  79*/
	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4,/* 80 ~  99*/
	3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6,/*100 ~ 119*/
	4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4,/*120 ~ 139*/
	3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,/*140 ~ 159*/
	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5,/*160 ~ 179*/
	4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5,/*180 ~ 199*/
	3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6,/*200 ~ 219*/
	5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,/*220 ~ 239*/
	4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8             /*240 ~ 255*/
};

static void usage(void)
{
	fprintf(stderr, "Usage: dump.exfat\n");
	fprintf(stderr, "\t-V | --version                        Show version\n");
	fprintf(stderr, "\t-h | --help                           Show help\n");

	exit(EXIT_FAILURE);
}

static struct option opts[] = {
	{"version",		no_argument,		NULL,	'V' },
	{"help",		no_argument,		NULL,	'h' },
	{"?",			no_argument,		NULL,	'?' },
	{NULL,			0,			NULL,	 0  }
};

static unsigned int exfat_count_used_clusters(unsigned char *bitmap,
		unsigned long long bitmap_len)
{
	unsigned int count = 0;
	unsigned long long i;

	for (i = 0; i < bitmap_len; i++)
		count += used_bit[bitmap[i]];

	return count;
}

static int exfat_show_ondisk_all_info(struct exfat_blk_dev *bd)
{
	struct pbr *ppbr;
	struct bsx64 *pbsx;
	struct exfat_dentry *ed;
	unsigned int root_clu_off, bitmap_clu_off, bitmap_clu;
	unsigned int total_clus, used_clus, clu_offset, root_clu;
	unsigned long long bitmap_len;
	int ret;
	unsigned char *bitmap;
	char *volume_label;

	ppbr = malloc(EXFAT_MAX_SECTOR_SIZE);
	if (!ppbr) {
		exfat_err("Cannot allocate pbr: out of memory\n");
		return -ENOMEM;
	}

	/* read main boot sector */
	if (exfat_read(bd->dev_fd, (char *)ppbr, EXFAT_MAX_SECTOR_SIZE,
			0) != (ssize_t)EXFAT_MAX_SECTOR_SIZE) {
		exfat_err("main boot sector read failed\n");
		ret = -EIO;
		goto free_ppbr;
	}

	if (memcmp(ppbr->bpb.oem_name, "EXFAT   ", 8) != 0) {
		exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n");
		ret = -EINVAL;
		goto free_ppbr;
	}

	pbsx = &ppbr->bsx;

	if (pbsx->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS ||
	    pbsx->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) {
		exfat_err("bogus sector size bits : %u\n",
				pbsx->sect_size_bits);
		ret = -EINVAL;
		goto free_ppbr;
	}

	if (pbsx->sect_per_clus_bits > 25 - pbsx->sect_size_bits) {
		exfat_err("bogus sectors bits per cluster : %u\n",
				pbsx->sect_per_clus_bits);
		ret = -EINVAL;
		goto free_ppbr;
	}

	bd->sector_size_bits = pbsx->sect_size_bits;
	bd->sector_size = 1 << pbsx->sect_size_bits;

	clu_offset = le32_to_cpu(pbsx->clu_offset);
	total_clus = le32_to_cpu(pbsx->clu_count);
	root_clu = le32_to_cpu(pbsx->root_cluster);

	exfat_info("-------------- Dump Boot sector region --------------\n");
	exfat_info("Volume Length(sectors): \t\t%" PRIu64 "\n",
			le64_to_cpu(pbsx->vol_length));
	exfat_info("FAT Offset(sector offset): \t\t%u\n",
			le32_to_cpu(pbsx->fat_offset));
	exfat_info("FAT Length(sectors): \t\t\t%u\n",
			le32_to_cpu(pbsx->fat_length));
	exfat_info("Cluster Heap Offset (sector offset): \t%u\n", clu_offset);
	exfat_info("Cluster Count: \t\t\t\t%u\n", total_clus);
	exfat_info("Root Cluster (cluster offset): \t\t%u\n", root_clu);
	exfat_info("Volume Serial: \t\t\t\t0x%x\n", le32_to_cpu(pbsx->vol_serial));
	exfat_info("Sector Size Bits: \t\t\t%u\n", pbsx->sect_size_bits);
	exfat_info("Sector per Cluster bits: \t\t%u\n\n", pbsx->sect_per_clus_bits);

	bd->cluster_size =
		1 << (pbsx->sect_per_clus_bits + pbsx->sect_size_bits);
	root_clu_off = exfat_clus_to_blk_dev_off(bd, clu_offset, root_clu);

	ed = malloc(sizeof(struct exfat_dentry)*3);
	if (!ed) {
		exfat_err("failed to allocate memory\n");
		ret = -ENOMEM;
		goto free_ppbr;
	}

	ret = exfat_read(bd->dev_fd, ed, sizeof(struct exfat_dentry)*3,
			root_clu_off);
	if (ret < 0) {
		exfat_err("bitmap entry read failed: %d\n", errno);
		ret = -EIO;
		goto free_entry;
	}

	volume_label = exfat_conv_volume_label(&ed[0]);
	if (!volume_label) {
		ret = -EINVAL;
		goto free_entry;
	}

	bitmap_clu = le32_to_cpu(ed[1].bitmap_start_clu);
	bitmap_clu_off = exfat_clus_to_blk_dev_off(bd, clu_offset,
			bitmap_clu);
	bitmap_len = le64_to_cpu(ed[1].bitmap_size);

	exfat_info("----------------- Dump Root entries -----------------\n");
	exfat_info("Volume entry type: \t\t\t0x%x\n", ed[0].type);
	exfat_info("Volume label: \t\t\t\t%s\n", volume_label);
	exfat_info("Volume label character count: \t\t%u\n", ed[0].vol_char_cnt);

	exfat_info("Bitmap entry type: \t\t\t0x%x\n", ed[1].type);
	exfat_info("Bitmap start cluster: \t\t\t%x\n", bitmap_clu);
	exfat_info("Bitmap size: \t\t\t\t%llu\n", bitmap_len);

	exfat_info("Upcase table entry type: \t\t0x%x\n", ed[2].type);
	exfat_info("Upcase table start cluster: \t\t%x\n",
			le32_to_cpu(ed[2].upcase_start_clu));
	exfat_info("Upcase table size: \t\t\t%" PRIu64 "\n\n",
			le64_to_cpu(ed[2].upcase_size));

	bitmap = malloc(bitmap_len);
	if (!bitmap) {
		exfat_err("bitmap allocation failed\n");
		ret = -ENOMEM;
		goto free_volume_label;
	}

	ret = exfat_read(bd->dev_fd, bitmap, bitmap_len, bitmap_clu_off);
	if (ret < 0) {
		exfat_err("bitmap entry read failed: %d\n", errno);
		ret = -EIO;
		free(bitmap);
		goto free_volume_label;
	}

	total_clus = le32_to_cpu(pbsx->clu_count);
	used_clus = exfat_count_used_clusters(bitmap, bitmap_len);

	exfat_info("---------------- Show the statistics ----------------\n");
	exfat_info("Cluster size:  \t\t\t\t%u\n", bd->cluster_size);
	exfat_info("Total Clusters: \t\t\t%u\n", total_clus);
	exfat_info("Free Clusters: \t\t\t\t%u\n", total_clus-used_clus);
	ret = 0;

	free(bitmap);

free_volume_label:
	free(volume_label);
free_entry:
	free(ed);
free_ppbr:
	free(ppbr);
	return ret;
}

int main(int argc, char *argv[])
{
	int c;
	int ret = EXIT_FAILURE;
	struct exfat_blk_dev bd;
	struct exfat_user_input ui;
	bool version_only = false;

	init_user_input(&ui);

	if (!setlocale(LC_CTYPE, ""))
		exfat_err("failed to init locale/codeset\n");

	opterr = 0;
	while ((c = getopt_long(argc, argv, "iVh", opts, NULL)) != EOF)
		switch (c) {
		case 'V':
			version_only = true;
			break;
		case '?':
		case 'h':
		default:
			usage();
	}

	show_version();
	if (version_only)
		exit(EXIT_FAILURE);

	if (argc < 2)
		usage();

	memset(ui.dev_name, 0, sizeof(ui.dev_name));
	snprintf(ui.dev_name, sizeof(ui.dev_name), "%s", argv[1]);

	ret = exfat_get_blk_dev_info(&ui, &bd);
	if (ret < 0)
		goto out;

	ret = exfat_show_ondisk_all_info(&bd);
	close(bd.dev_fd);

out:
	return ret;
}