summaryrefslogtreecommitdiff
path: root/tools/firmware-utils/src/mktplinkfw.c
blob: 9bb353eb63f0693f536a990936cc53bb2373850a (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
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
/*
 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
 *
 * This tool was based on:
 *   TP-Link WR941 V2 firmware checksum fixing tool.
 *   Copyright (C) 2008,2009 Wang Jian <lark@linux.net.cn>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>     /* for unlink() */
#include <libgen.h>
#include <getopt.h>     /* for getopt() */
#include <stdarg.h>
#include <errno.h>
#include <sys/stat.h>

#include "md5.h"

#if (__BYTE_ORDER == __BIG_ENDIAN)
#  define HOST_TO_BE32(x)	(x)
#  define BE32_TO_HOST(x)	(x)
#else
#  define HOST_TO_BE32(x)	bswap_32(x)
#  define BE32_TO_HOST(x)	bswap_32(x)
#endif

#define HEADER_VERSION_V1	0x01000000
#define HWID_TL_WR741ND_V1	0x07410001
#define HWID_TL_WR841ND_V3	0x08410003
#define HWID_TL_WR941ND_V2	0x09410002

#define MD5SUM_LEN	16

struct file_info {
	char		*file_name;	/* name of the file */
	uint32_t	file_size;	/* length of the file */
};

struct fw_header {
	uint32_t	version;	/* header version */
	char		vendor_name[24];
	char		fw_version[36];
	uint32_t	hw_id;		/* hardware id */
	uint32_t	hw_rev;		/* hardware revision */
	uint32_t	unk1;
	uint8_t		md5sum1[MD5SUM_LEN];
	uint32_t	unk2;
	uint8_t		md5sum2[MD5SUM_LEN];
	uint32_t	unk3;
	uint32_t	kernel_la;	/* kernel load address */
	uint32_t	kernel_ep;	/* kernel entry point */
	uint32_t	fw_length;	/* total length of the firmware */
	uint32_t	kernel_ofs;	/* kernel data offset */
	uint32_t	kernel_len;	/* kernel data length */
	uint32_t	rootfs_ofs;	/* rootfs data offset */
	uint32_t	rootfs_len;	/* rootfs data length */
	uint32_t	boot_ofs;	/* bootloader data offset */
	uint32_t	boot_len;	/* bootloader data length */
	uint8_t		pad[360];
} __attribute__ ((packed));

struct board_info {
	char		*id;
	uint32_t	hw_id;
	uint32_t	hw_rev;
	uint32_t	fw_max_len;
	uint32_t	kernel_la;
	uint32_t	kernel_ep;
	uint32_t	rootfs_ofs;
};

/*
 * Globals
 */
static char *ofname;
static char *progname;
static char *vendor = "TP-LINK Technologies";
static char *version = "ver. 1.0";

static char *board_id;
static struct board_info *board;
static struct file_info kernel_info;
static struct file_info rootfs_info;
static struct file_info boot_info;
static int combined;

char md5salt_normal[MD5SUM_LEN] = {
	0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
	0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
};

char md5salt_boot[MD5SUM_LEN] = {
	0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
	0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
};

static struct board_info boards[] = {
	{
		.id		= "TL-WR741NDv1",
		.hw_id		= HWID_TL_WR741ND_V1,
		.hw_rev		= 1,
		.fw_max_len	= 0x3c0000,
		.kernel_la	= 0x80060000,
		.kernel_ep	= 0x80060000,
		.rootfs_ofs	= 0x140000,
	}, {
		.id		= "TL-WR841NDv3",
		.hw_id		= HWID_TL_WR841ND_V3,
		.hw_rev		= 3,
		.fw_max_len	= 0x3c0000,
		.kernel_la	= 0x80060000,
		.kernel_ep	= 0x80060000,
		.rootfs_ofs	= 0x140000,
	}, {
		.id		= "TL-WR941NDv2",
		.hw_id		= HWID_TL_WR941ND_V2,
		.hw_rev		= 2,
		.fw_max_len	= 0x3c0000,
		.kernel_la	= 0x80060000,
		.kernel_ep	= 0x80060000,
		.rootfs_ofs	= 0x140000,
	}, {
		/* terminating entry */
	}
};

/*
 * Message macros
 */
#define ERR(fmt, ...) do { \
	fflush(0); \
	fprintf(stderr, "[%s] *** error: " fmt "\n", \
			progname, ## __VA_ARGS__ ); \
} while (0)

#define ERRS(fmt, ...) do { \
	int save = errno; \
	fflush(0); \
	fprintf(stderr, "[%s] *** error: " fmt "\n", \
			progname, ## __VA_ARGS__, strerror(save)); \
} while (0)

#define DBG(fmt, ...) do { \
	fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
} while (0)

static struct board_info *find_board(char *id)
{
	struct board_info *ret;
	struct board_info *board;

	ret = NULL;
	for (board = boards; board->id != NULL; board++){
		if (strcasecmp(id, board->id) == 0) {
			ret = board;
			break;
		}
	};

	return ret;
}

static void usage(int status)
{
	FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
	struct board_info *board;

	fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
	fprintf(stream,
"\n"
"Options:\n"
"  -B <board>      create image for the board specified with <board>\n"
"  -c              use combined kernel image\n"
"  -k <file>       read kernel image from the file <file>\n"
"  -r <file>       read rootfs image from the file <file>\n"
"  -o <file>       write output to the file <file>\n"
"  -v <version>    set image version to <version>\n"
"  -h              show this screen\n"
	);

	exit(status);
}

static int get_md5(char *data, int size, char *md5)
{
	MD5_CTX ctx;

	MD5_Init(&ctx);
	MD5_Update(&ctx, data, size);
	MD5_Final(md5, &ctx);
}

static int get_file_stat(struct file_info *fdata)
{
	struct stat st;
	int res;

	if (fdata->file_name == NULL)
		return 0;

	res = stat(fdata->file_name, &st);
	if (res){
		ERRS("stat failed on %s", fdata->file_name);
		return res;
	}

	fdata->file_size = st.st_size;
	return 0;
}

static int read_to_buf(struct file_info *fdata, char *buf)
{
	FILE *f;
	int ret = EXIT_FAILURE;

	f = fopen(fdata->file_name, "r");
	if (f == NULL) {
		ERRS("could not open \"%s\" for reading", fdata->file_name);
		goto out;
	}

	errno = 0;
	fread(buf, fdata->file_size, 1, f);
	if (errno != 0) {
		ERRS("unable to read from file \"%s\"", fdata->file_name);
		goto out_close;
	}

	ret = EXIT_SUCCESS;

 out_close:
	fclose(f);
 out:
	return ret;
}

static int check_options(void)
{
	int ret;

	if (board_id == NULL) {
		ERR("no board specified");
		return -1;
	}

	board = find_board(board_id);
	if (board == NULL) {
		ERR("unknown/unsupported board id \"%s\"", board_id);
		return -1;
	}

	if (kernel_info.file_name == NULL) {
		ERR("no kernel image specified");
		return -1;
	}

	ret = get_file_stat(&kernel_info);
	if (ret)
		return ret;

	if (combined) {
		if (kernel_info.file_size >
		    board->fw_max_len - sizeof(struct fw_header)) {
			ERR("kernel image is too big");
			return -1;
		}
	} else {
		if (kernel_info.file_size >
		    board->rootfs_ofs - sizeof(struct fw_header)) {
			ERR("kernel image is too big");
			return -1;
		}
		if (rootfs_info.file_name == NULL) {
			ERR("no rootfs image specified");
			return -1;
		}

		ret = get_file_stat(&rootfs_info);
		if (ret)
			return ret;

		if (rootfs_info.file_size >
                    (board->fw_max_len - board->rootfs_ofs)) {
			ERR("rootfs image is too big");
			return -1;
		}
	}

	if (ofname == NULL) {
		ERR("no output file specified");
		return -1;
	}

	return 0;
}

static void fill_header(char *buf, int len)
{
	struct fw_header *hdr = (struct fw_header *)buf;

	memset(hdr, 0, sizeof(struct fw_header));

	hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
	strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
	strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
	hdr->hw_id = HOST_TO_BE32(board->hw_id);
	hdr->hw_rev = HOST_TO_BE32(board->hw_rev);

	if (boot_info.file_size == 0)
		memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
	else
		memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));

	hdr->kernel_la = HOST_TO_BE32(board->kernel_la);
	hdr->kernel_ep = HOST_TO_BE32(board->kernel_ep);
	hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
	hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
	hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
	if (!combined) {
		hdr->rootfs_ofs = HOST_TO_BE32(board->rootfs_ofs);
		hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
	}

	get_md5(buf, len, hdr->md5sum1);
}

static int write_fw(char *data, int len)
{
	FILE *f;
	int ret = EXIT_FAILURE;

	f = fopen(ofname, "w");
	if (f == NULL) {
		ERRS("could not open \"%s\" for writing", ofname);
		goto out;
	}

	errno = 0;
	fwrite(data, len, 1, f);
	if (errno) {
		ERRS("unable to write output file");
		goto out_flush;
	}

	DBG("firmware file \"%s\" completed", ofname);

	ret = EXIT_SUCCESS;

 out_flush:
	fflush(f);
	fclose(f);
	if (ret != EXIT_SUCCESS) {
		unlink(ofname);
	}
 out:
	return ret;
}

static int build_fw(void)
{
	int buflen;
	char *buf;
	char *p;
	int ret = EXIT_FAILURE;

	buflen = board->fw_max_len;

	buf = malloc(buflen);
	if (!buf) {
		ERR("no memory for buffer\n");
		goto out;
	}

	memset(buf, 0xff, buflen);
	p = buf + sizeof(struct fw_header);
	ret = read_to_buf(&kernel_info, p);
	if (ret)
		goto out_free_buf;

	if (!combined) {
		p = buf + board->rootfs_ofs;
		ret = read_to_buf(&rootfs_info, p);
		if (ret)
			goto out_free_buf;
	}

	fill_header(buf, buflen);

	ret = write_fw(buf, buflen);
	if (ret)
		goto out_free_buf;

	ret = EXIT_SUCCESS;

 out_free_buf:
	free(buf);
 out:
	return ret;
}

int main(int argc, char *argv[])
{
	int ret = EXIT_FAILURE;
	int err;

	FILE *outfile;

	progname = basename(argv[0]);

	while ( 1 ) {
		int c;

		c = getopt(argc, argv, "B:V:N:ck:r:o:v:h:");
		if (c == -1)
			break;

		switch (c) {
		case 'B':
			board_id = optarg;
			break;
		case 'V':
			version = optarg;
			break;
		case 'N':
			vendor = optarg;
			break;
		case 'c':
			combined++;
			break;
		case 'k':
			kernel_info.file_name = optarg;
			break;
		case 'r':
			rootfs_info.file_name = optarg;
			break;
		case 'o':
			ofname = optarg;
			break;
		case 'v':
			version = optarg;
			break;
		case 'h':
			usage(EXIT_SUCCESS);
			break;
		default:
			usage(EXIT_FAILURE);
			break;
		}
	}

	ret = check_options();
	if (ret)
		goto out;

	ret = build_fw();

 out:
	return ret;
}