aboutsummaryrefslogtreecommitdiff
path: root/nor-utils/rfddump.c
blob: 78ec443a54e9d2fa9943b040bff19d9098a5606d (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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
/*
 * rfddump.c
 *
 * Copyright (C) 2005 Sean Young <sean@mess.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 */

#define PROGRAM_NAME "rfddump"

#define _XOPEN_SOURCE 500 /* For pread */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>

#include <mtd/mtd-user.h>
#include <linux/types.h>
#include <mtd_swab.h>

#include "common.h"

/* next is an array of mapping for each corresponding sector */
#define RFD_MAGIC		0x9193
#define HEADER_MAP_OFFSET       3
#define SECTOR_DELETED          0x0000
#define SECTOR_ZERO             0xfffe
#define SECTOR_FREE             0xffff

#define SECTOR_SIZE             512

#define SECTORS_PER_TRACK	63


struct rfd {
	int block_size;
	int block_count;
	int header_sectors;
	int data_sectors;
	int header_size;
	uint16_t *header;
	int sector_count;
	int *sector_map;
	const char *mtd_filename;
	const char *out_filename;
	int verbose;
};

static void display_help(int status)
{
	printf("Usage: %s [OPTIONS] MTD-device filename\n"
			"Dumps the contents of a resident flash disk\n"
			"\n"
			"-h         --help               display this help and exit\n"
			"-V         --version            output version information and exit\n"
			"-v         --verbose		Be verbose\n"
			"-b size    --blocksize          Block size (defaults to erase unit)\n",
			PROGRAM_NAME);
	exit(status);
}

static void display_version(void)
{
	common_print_version();
	printf("This is free software; see the source for copying conditions.  There is NO\n"
			"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n");
	exit(0);
}

static void process_options(int argc, char *argv[], struct rfd *rfd)
{
	int error = 0;

	rfd->block_size = 0;
	rfd->verbose = 0;

	for (;;) {
		int option_index = 0;
		static const char *short_options = "hvVb:";
		static const struct option long_options[] = {
			{ "help", no_argument, 0, 'h' },
			{ "version", no_argument, 0, 'V', },
			{ "blocksize", required_argument, 0, 'b' },
			{ "verbose", no_argument, 0, 'v' },
			{ NULL, 0, 0, 0 }
		};

		int c = getopt_long(argc, argv, short_options,
				long_options, &option_index);
		if (c == EOF)
			break;

		switch (c) {
			case 'h':
				display_help(EXIT_SUCCESS);
				break;
			case 'V':
				display_version();
				break;
			case 'v':
				rfd->verbose = 1;
				break;
			case 'b':
				rfd->block_size = atoi(optarg);
				break;
			case '?':
				error = 1;
				break;
		}
	}

	if ((argc - optind) != 2 || error)
		display_help(EXIT_FAILURE);

	rfd->mtd_filename = argv[optind];
	rfd->out_filename = argv[optind + 1];
}

static int build_block_map(struct rfd *rfd, int fd, int block)
{
	int  i;
	int sectors;

	if (pread(fd, rfd->header, rfd->header_size, block * rfd->block_size)
			!= rfd->header_size) {
		return -1;
	}

	if (le16_to_cpu(rfd->header[0]) != RFD_MAGIC) {
		if (rfd->verbose)
			printf("Block #%02d: Magic missing\n", block);

		return 0;
	}

	sectors =  0;
	for (i=0; i<rfd->data_sectors; i++) {
		uint16_t entry = le16_to_cpu(rfd->header[i + HEADER_MAP_OFFSET]);

		if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
			continue;

		if (entry == SECTOR_ZERO)
			entry = 0;

		if (entry >= rfd->sector_count) {
			fprintf(stderr, "%s: warning: sector %d out of range\n",
					rfd->mtd_filename, entry);
			continue;
		}

		if (rfd->sector_map[entry] != -1) {
			fprintf(stderr, "%s: warning: more than one entry "
					"for sector %d\n", rfd->mtd_filename, entry);
			continue;
		}

		rfd->sector_map[entry] = rfd->block_size * block +
			(i + rfd->header_sectors) * SECTOR_SIZE;
		sectors++;
	}

	if (rfd->verbose)
		printf("Block #%02d: %d sectors\n", block, sectors);

	return 1;
}

int main(int argc, char *argv[])
{
	int fd, sectors_per_block;
	mtd_info_t mtd_info;
	struct rfd rfd;
	int i, blocks_found;
	int out_fd = 0;
	uint8_t sector[512];
	int blank, rc, cylinders;

	process_options(argc, argv, &rfd);

	fd = open(rfd.mtd_filename, O_RDONLY);
	if (fd == -1) {
		perror(rfd.mtd_filename);
		return 1;
	}

	if (rfd.block_size == 0) {
		if (ioctl(fd, MEMGETINFO, &mtd_info)) {
			perror(rfd.mtd_filename);
			close(fd);
			return 1;
		}

		if (mtd_info.type != MTD_NORFLASH) {
			fprintf(stderr, "%s: wrong type\n", rfd.mtd_filename);
			close(fd);
			return 2;
		}

		sectors_per_block = mtd_info.erasesize / SECTOR_SIZE;

		rfd.block_size = mtd_info.erasesize;
		rfd.block_count = mtd_info.size / mtd_info.erasesize;
	} else {
		struct stat st;

		if (fstat(fd, &st) == -1) {
			perror(rfd.mtd_filename);
			close(fd);
			return 1;
		}

		if (st.st_size % SECTOR_SIZE)
			fprintf(stderr, "%s: warning: not a multiple of sectors (512 bytes)\n", rfd.mtd_filename);

		sectors_per_block = rfd.block_size / SECTOR_SIZE;

		if (st.st_size % rfd.block_size)
			fprintf(stderr, "%s: warning: not a multiple of block size\n", rfd.mtd_filename);

		rfd.block_count = st.st_size / rfd.block_size;

		if (!rfd.block_count) {
			fprintf(stderr, "%s: not large enough for one block\n", rfd.mtd_filename);
			close(fd);
			return 2;
		}
	}

	rfd.header_sectors =
		((HEADER_MAP_OFFSET + sectors_per_block) *
		 sizeof(uint16_t) + SECTOR_SIZE - 1) / SECTOR_SIZE;
	rfd.data_sectors = sectors_per_block - rfd.header_sectors;
	cylinders = ((rfd.block_count - 1) * rfd.data_sectors - 1)
		/ SECTORS_PER_TRACK;
	rfd.sector_count = cylinders * SECTORS_PER_TRACK;
	rfd.header_size =
		(HEADER_MAP_OFFSET + rfd.data_sectors) * sizeof(uint16_t);

	rfd.header = malloc(rfd.header_size);
	if (!rfd.header) {
		perror(PROGRAM_NAME);
		close(fd);
		return 2;
	}
	rfd.sector_map = malloc(rfd.sector_count * sizeof(int));
	if (!rfd.sector_map) {
		perror(PROGRAM_NAME);
		close(fd);
		free(rfd.header);
		return 2;
	}

	rfd.mtd_filename = rfd.mtd_filename;

	for (i=0; i<rfd.sector_count; i++)
		rfd.sector_map[i] = -1;

	for (blocks_found=i=0; i<rfd.block_count; i++) {
		rc = build_block_map(&rfd, fd, i);
		if (rc > 0)
			blocks_found++;
		if (rc < 0)
			goto err;
	}

	if (!blocks_found) {
		fprintf(stderr, "%s: no RFD blocks found\n", rfd.mtd_filename);
		goto err;
	}

	for (i=0; i<rfd.sector_count; i++) {
		if (rfd.sector_map[i] != -1)
			break;
	}

	if (i == rfd.sector_count) {
		fprintf(stderr, "%s: no sectors found\n", rfd.mtd_filename);
		goto err;
	}

	out_fd = open(rfd.out_filename, O_WRONLY | O_TRUNC | O_CREAT, 0666);
	if (out_fd == -1) {
		perror(rfd.out_filename);
		goto err;
	}

	blank = 0;
	for (i=0; i<rfd.sector_count; i++) {
		if (rfd.sector_map[i] == -1) {
			memset(sector, 0, SECTOR_SIZE);
			blank++;
		} else {
			if (pread(fd, sector, SECTOR_SIZE, rfd.sector_map[i])
					!= SECTOR_SIZE) {
				perror(rfd.mtd_filename);
				goto err;
			}
		}

		if (write(out_fd, sector, SECTOR_SIZE) != SECTOR_SIZE) {
			perror(rfd.out_filename);
			goto err;
		}
	}

	if (rfd.verbose)
		printf("Copied %d sectors (%d blank)\n", rfd.sector_count, blank);

	close(out_fd);
	close(fd);
	free(rfd.header);
	free(rfd.sector_map);

	return 0;

err:
	if (out_fd > 0)
		close(out_fd);

	close(fd);
	free(rfd.header);
	free(rfd.sector_map);

	return 2;
}