summaryrefslogtreecommitdiff
path: root/tools/firmware-utils/src/tplink-safeloader.c
blob: 7a5990cc9b4d7319d1b5f6b7e439f651384444f7 (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
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
/*
  Copyright (c) 2014, Matthias Schiffer <mschiffer@universe-factory.net>
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice,
       this list of conditions and the following disclaimer in the documentation
       and/or other materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


/*
   tplink-safeloader

   Image generation tool for the TP-LINK SafeLoader as seen on
   TP-LINK Pharos devices (CPE210/220/510/520)
*/


#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include <arpa/inet.h>

#include <sys/types.h>
#include <sys/stat.h>

#include "md5.h"


#define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })


#define MAX_PARTITIONS	32

/** An image partition table entry */
struct image_partition_entry {
	const char *name;
	size_t size;
	uint8_t *data;
};

/** A flash partition table entry */
struct flash_partition_entry {
	const char *name;
	uint32_t base;
	uint32_t size;
};

/** Firmware layout description */
struct device_info {
	const char *id;
	const char *vendor;
	const char *support_list;
	char support_trail;
	const struct flash_partition_entry partitions[MAX_PARTITIONS+1];
	const char *first_sysupgrade_partition;
	const char *last_sysupgrade_partition;
};

/** The content of the soft-version structure */
struct __attribute__((__packed__)) soft_version {
	uint32_t magic;
	uint32_t zero;
	uint8_t pad1;
	uint8_t version_major;
	uint8_t version_minor;
	uint8_t version_patch;
	uint8_t year_hi;
	uint8_t year_lo;
	uint8_t month;
	uint8_t day;
	uint32_t rev;
	uint8_t pad2;
};


static const uint8_t jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};


/**
   Salt for the MD5 hash

   Fortunately, TP-LINK seems to use the same salt for most devices which use
   the new image format.
*/
static const uint8_t md5_salt[16] = {
	0x7a, 0x2b, 0x15, 0xed,
	0x9b, 0x98, 0x59, 0x6d,
	0xe5, 0x04, 0xab, 0x44,
	0xac, 0x2a, 0x9f, 0x4e,
};


/** Firmware layout table */
static struct device_info boards[] = {
	/** Firmware layout for the CPE210/220 */
	{
		.id	= "CPE210",
		.vendor	= "CPE510(TP-LINK|UN|N300-5):1.0\r\n",
		.support_list =
			"SupportList:\r\n"
			"CPE210(TP-LINK|UN|N300-2):1.0\r\n"
			"CPE210(TP-LINK|UN|N300-2):1.1\r\n"
			"CPE210(TP-LINK|US|N300-2):1.1\r\n"
			"CPE210(TP-LINK|EU|N300-2):1.1\r\n"
			"CPE220(TP-LINK|UN|N300-2):1.1\r\n"
			"CPE220(TP-LINK|US|N300-2):1.1\r\n"
			"CPE220(TP-LINK|EU|N300-2):1.1\r\n",
		.support_trail = '\xff',

		.partitions = {
			{"fs-uboot", 0x00000, 0x20000},
			{"partition-table", 0x20000, 0x02000},
			{"default-mac", 0x30000, 0x00020},
			{"product-info", 0x31100, 0x00100},
			{"signature", 0x32000, 0x00400},
			{"os-image", 0x40000, 0x170000},
			{"soft-version", 0x1b0000, 0x00100},
			{"support-list", 0x1b1000, 0x00400},
			{"file-system", 0x1c0000, 0x600000},
			{"user-config", 0x7c0000, 0x10000},
			{"default-config", 0x7d0000, 0x10000},
			{"log", 0x7e0000, 0x10000},
			{"radio", 0x7f0000, 0x10000},
			{NULL, 0, 0}
		},

		.first_sysupgrade_partition = "os-image",
		.last_sysupgrade_partition = "file-system",
	},

	/** Firmware layout for the CPE510/520 */
	{
		.id	= "CPE510",
		.vendor	= "CPE510(TP-LINK|UN|N300-5):1.0\r\n",
		.support_list =
			"SupportList:\r\n"
			"CPE510(TP-LINK|UN|N300-5):1.0\r\n"
			"CPE510(TP-LINK|UN|N300-5):1.1\r\n"
			"CPE510(TP-LINK|UN|N300-5):1.1\r\n"
			"CPE510(TP-LINK|US|N300-5):1.1\r\n"
			"CPE510(TP-LINK|EU|N300-5):1.1\r\n"
			"CPE520(TP-LINK|UN|N300-5):1.1\r\n"
			"CPE520(TP-LINK|US|N300-5):1.1\r\n"
			"CPE520(TP-LINK|EU|N300-5):1.1\r\n",
		.support_trail = '\xff',

		.partitions = {
			{"fs-uboot", 0x00000, 0x20000},
			{"partition-table", 0x20000, 0x02000},
			{"default-mac", 0x30000, 0x00020},
			{"product-info", 0x31100, 0x00100},
			{"signature", 0x32000, 0x00400},
			{"os-image", 0x40000, 0x170000},
			{"soft-version", 0x1b0000, 0x00100},
			{"support-list", 0x1b1000, 0x00400},
			{"file-system", 0x1c0000, 0x600000},
			{"user-config", 0x7c0000, 0x10000},
			{"default-config", 0x7d0000, 0x10000},
			{"log", 0x7e0000, 0x10000},
			{"radio", 0x7f0000, 0x10000},
			{NULL, 0, 0}
		},

		.first_sysupgrade_partition = "os-image",
		.last_sysupgrade_partition = "file-system",
	},

	/** Firmware layout for the C2600 */
	{
		.id = "C2600",
		.vendor = "",
		.support_list =
			"SupportList:\r\n"
			"{product_name:Archer C2600,product_ver:1.0.0,special_id:00000000}\r\n",
		.support_trail = '\x00',

		.partitions = {
			{"SBL1", 0x00000, 0x20000},
			{"MIBIB", 0x20000, 0x20000},
			{"SBL2", 0x40000, 0x20000},
			{"SBL3", 0x60000, 0x30000},
			{"DDRCONFIG", 0x90000, 0x10000},
			{"SSD", 0xa0000, 0x10000},
			{"TZ", 0xb0000, 0x30000},
			{"RPM", 0xe0000, 0x20000},
			{"fs-uboot", 0x100000, 0x70000},
			{"uboot-env", 0x170000, 0x40000},
			{"radio", 0x1b0000, 0x40000},
			{"os-image", 0x1f0000, 0x200000},
			{"file-system", 0x3f0000, 0x1b00000},
			{"default-mac", 0x1ef0000, 0x00200},
			{"pin", 0x1ef0200, 0x00200},
			{"product-info", 0x1ef0400, 0x0fc00},
			{"partition-table", 0x1f00000, 0x10000},
			{"soft-version", 0x1f10000, 0x10000},
			{"support-list", 0x1f20000, 0x10000},
			{"profile", 0x1f30000, 0x10000},
			{"default-config", 0x1f40000, 0x10000},
			{"user-config", 0x1f50000, 0x40000},
			{"qos-db", 0x1f90000, 0x40000},
			{"usb-config", 0x1fd0000, 0x10000},
			{"log", 0x1fe0000, 0x20000},
			{NULL, 0, 0}
		},

		.first_sysupgrade_partition = "os-image",
		.last_sysupgrade_partition = "file-system"
	},

	/** Firmware layout for the C9 */
	{
		.id = "ARCHERC9",
		.vendor = "",
		.support_list =
			"SupportList:\n"
			"{product_name:ArcherC9,"
			"product_ver:1.0.0,"
			"special_id:00000000}\n",
		.support_trail = '\x00',

		.partitions = {
			{"fs-uboot", 0x00000, 0x40000},
			{"os-image", 0x40000, 0x200000},
			{"file-system", 0x240000, 0xc00000},
			{"default-mac", 0xe40000, 0x00200},
			{"pin", 0xe40200, 0x00200},
			{"product-info", 0xe40400, 0x00200},
			{"partition-table", 0xe50000, 0x10000},
			{"soft-version", 0xe60000, 0x00200},
			{"support-list", 0xe61000, 0x0f000},
			{"profile", 0xe70000, 0x10000},
			{"default-config", 0xe80000, 0x10000},
			{"user-config", 0xe90000, 0x50000},
			{"log", 0xee0000, 0x100000},
			{"radio_bk", 0xfe0000, 0x10000},
			{"radio", 0xff0000, 0x10000},
			{NULL, 0, 0}
		},

		.first_sysupgrade_partition = "os-image",
		.last_sysupgrade_partition = "file-system"
	},

	/** Firmware layout for the EAP120 */
	{
		.id     = "EAP120",
		.vendor = "EAP120(TP-LINK|UN|N300-2):1.0\r\n",
		.support_list =
			"SupportList:\r\n"
			"EAP120(TP-LINK|UN|N300-2):1.0\r\n",
		.support_trail = '\xff',

		.partitions = {
			{"fs-uboot", 0x00000, 0x20000},
			{"partition-table", 0x20000, 0x02000},
			{"default-mac", 0x30000, 0x00020},
			{"support-list", 0x31000, 0x00100},
			{"product-info", 0x31100, 0x00100},
			{"soft-version", 0x32000, 0x00100},
			{"os-image", 0x40000, 0x180000},
			{"file-system", 0x1c0000, 0x600000},
			{"user-config", 0x7c0000, 0x10000},
			{"backup-config", 0x7d0000, 0x10000},
			{"log", 0x7e0000, 0x10000},
			{"radio", 0x7f0000, 0x10000},
			{NULL, 0, 0}
		},

		.first_sysupgrade_partition = "os-image",
		.last_sysupgrade_partition = "file-system"
	},

	{}
};

#define error(_ret, _errno, _str, ...)				\
	do {							\
		fprintf(stderr, _str ": %s\n", ## __VA_ARGS__,	\
			strerror(_errno));			\
		if (_ret)					\
			exit(_ret);				\
	} while (0)


/** Stores a uint32 as big endian */
static inline void put32(uint8_t *buf, uint32_t val) {
	buf[0] = val >> 24;
	buf[1] = val >> 16;
	buf[2] = val >> 8;
	buf[3] = val;
}

/** Allocates a new image partition */
static struct image_partition_entry alloc_image_partition(const char *name, size_t len) {
	struct image_partition_entry entry = {name, len, malloc(len)};
	if (!entry.data)
		error(1, errno, "malloc");

	return entry;
}

/** Frees an image partition */
static void free_image_partition(struct image_partition_entry entry) {
	free(entry.data);
}

/** Generates the partition-table partition */
static struct image_partition_entry make_partition_table(const struct flash_partition_entry *p) {
	struct image_partition_entry entry = alloc_image_partition("partition-table", 0x800);

	char *s = (char *)entry.data, *end = (char *)(s+entry.size);

	*(s++) = 0x00;
	*(s++) = 0x04;
	*(s++) = 0x00;
	*(s++) = 0x00;

	size_t i;
	for (i = 0; p[i].name; i++) {
		size_t len = end-s;
		size_t w = snprintf(s, len, "partition %s base 0x%05x size 0x%05x\n", p[i].name, p[i].base, p[i].size);

		if (w > len-1)
			error(1, 0, "flash partition table overflow?");

		s += w;
	}

	s++;

	memset(s, 0xff, end-s);

	return entry;
}


/** Generates a binary-coded decimal representation of an integer in the range [0, 99] */
static inline uint8_t bcd(uint8_t v) {
	return 0x10 * (v/10) + v%10;
}


/** Generates the soft-version partition */
static struct image_partition_entry make_soft_version(uint32_t rev) {
	struct image_partition_entry entry = alloc_image_partition("soft-version", sizeof(struct soft_version));
	struct soft_version *s = (struct soft_version *)entry.data;

	time_t t;

	if (time(&t) == (time_t)(-1))
		error(1, errno, "time");

	struct tm *tm = localtime(&t);

	s->magic = htonl(0x0000000c);
	s->zero = 0;
	s->pad1 = 0xff;

	s->version_major = 0;
	s->version_minor = 0;
	s->version_patch = 0;

	s->year_hi = bcd((1900+tm->tm_year)/100);
	s->year_lo = bcd(tm->tm_year%100);
	s->month = bcd(tm->tm_mon+1);
	s->day = bcd(tm->tm_mday);
	s->rev = htonl(rev);

	s->pad2 = 0xff;

	return entry;
}

/** Generates the support-list partition */
static struct image_partition_entry make_support_list(const struct device_info *info) {
	size_t len = strlen(info->support_list);
	struct image_partition_entry entry = alloc_image_partition("support-list", len + 9);

	put32(entry.data, len);
	memset(entry.data+4, 0, 4);
	memcpy(entry.data+8, info->support_list, len);
	entry.data[len+8] = info->support_trail;

	return entry;
}

/** Creates a new image partition with an arbitrary name from a file */
static struct image_partition_entry read_file(const char *part_name, const char *filename, bool add_jffs2_eof) {
	struct stat statbuf;

	if (stat(filename, &statbuf) < 0)
		error(1, errno, "unable to stat file `%s'", filename);

	size_t len = statbuf.st_size;

	if (add_jffs2_eof)
		len = ALIGN(len, 0x10000) + sizeof(jffs2_eof_mark);

	struct image_partition_entry entry = alloc_image_partition(part_name, len);

	FILE *file = fopen(filename, "rb");
	if (!file)
		error(1, errno, "unable to open file `%s'", filename);

	if (fread(entry.data, statbuf.st_size, 1, file) != 1)
		error(1, errno, "unable to read file `%s'", filename);

	if (add_jffs2_eof) {
		uint8_t *eof = entry.data + statbuf.st_size, *end = entry.data+entry.size;

		memset(eof, 0xff, end - eof - sizeof(jffs2_eof_mark));
		memcpy(end - sizeof(jffs2_eof_mark), jffs2_eof_mark, sizeof(jffs2_eof_mark));
	}

	fclose(file);

	return entry;
}


/**
   Copies a list of image partitions into an image buffer and generates the image partition table while doing so

   Example image partition table:

     fwup-ptn partition-table base 0x00800 size 0x00800
     fwup-ptn os-image base 0x01000 size 0x113b45
     fwup-ptn file-system base 0x114b45 size 0x1d0004
     fwup-ptn support-list base 0x2e4b49 size 0x000d1

   Each line of the partition table is terminated with the bytes 09 0d 0a ("\t\r\n"),
   the end of the partition table is marked with a zero byte.

   The firmware image must contain at least the partition-table and support-list partitions
   to be accepted. There aren't any alignment constraints for the image partitions.

   The partition-table partition contains the actual flash layout; partitions
   from the image partition table are mapped to the corresponding flash partitions during
   the firmware upgrade. The support-list partition contains a list of devices supported by
   the firmware image.

   The base offsets in the firmware partition table are relative to the end
   of the vendor information block, so the partition-table partition will
   actually start at offset 0x1814 of the image.

   I think partition-table must be the first partition in the firmware image.
*/
static void put_partitions(uint8_t *buffer, const struct flash_partition_entry *flash_parts, const struct image_partition_entry *parts) {
	size_t i, j;
	char *image_pt = (char *)buffer, *end = image_pt + 0x800;

	size_t base = 0x800;
	for (i = 0; parts[i].name; i++) {
		for (j = 0; flash_parts[j].name; j++) {
			if (!strcmp(flash_parts[j].name, parts[i].name)) {
				if (parts[i].size > flash_parts[j].size)
					error(1, 0, "%s partition too big (more than %u bytes)", flash_parts[j].name, (unsigned)flash_parts[j].size);
				break;
			}
		}

		assert(flash_parts[j].name);

		memcpy(buffer + base, parts[i].data, parts[i].size);

		size_t len = end-image_pt;
		size_t w = snprintf(image_pt, len, "fwup-ptn %s base 0x%05x size 0x%05x\t\r\n", parts[i].name, (unsigned)base, (unsigned)parts[i].size);

		if (w > len-1)
			error(1, 0, "image partition table overflow?");

		image_pt += w;

		base += parts[i].size;
	}
}

/** Generates and writes the image MD5 checksum */
static void put_md5(uint8_t *md5, uint8_t *buffer, unsigned int len) {
	MD5_CTX ctx;

	MD5_Init(&ctx);
	MD5_Update(&ctx, md5_salt, (unsigned int)sizeof(md5_salt));
	MD5_Update(&ctx, buffer, len);
	MD5_Final(md5, &ctx);
}


/**
   Generates the firmware image in factory format

   Image format:

     Bytes (hex)  Usage
     -----------  -----
     0000-0003    Image size (4 bytes, big endian)
     0004-0013    MD5 hash (hash of a 16 byte salt and the image data starting with byte 0x14)
     0014-0017    Vendor information length (without padding) (4 bytes, big endian)
     0018-1013    Vendor information (4092 bytes, padded with 0xff; there seem to be older
                  (VxWorks-based) TP-LINK devices which use a smaller vendor information block)
     1014-1813    Image partition table (2048 bytes, padded with 0xff)
     1814-xxxx    Firmware partitions
*/
static void * generate_factory_image(const struct device_info *info, const struct image_partition_entry *parts, size_t *len) {
	*len = 0x1814;

	size_t i;
	for (i = 0; parts[i].name; i++)
		*len += parts[i].size;

	uint8_t *image = malloc(*len);
	if (!image)
		error(1, errno, "malloc");

	memset(image, 0xff, *len);
	put32(image, *len);

	if (info->vendor) {
		size_t vendor_len = strlen(info->vendor);
		put32(image+0x14, vendor_len);
		memcpy(image+0x18, info->vendor, vendor_len);
	}

	put_partitions(image + 0x1014, info->partitions, parts);
	put_md5(image+0x04, image+0x14, *len-0x14);

	return image;
}

/**
   Generates the firmware image in sysupgrade format

   This makes some assumptions about the provided flash and image partition tables and
   should be generalized when TP-LINK starts building its safeloader into hardware with
   different flash layouts.
*/
static void * generate_sysupgrade_image(const struct device_info *info, const struct image_partition_entry *image_parts, size_t *len) {
	size_t i, j;
	size_t flash_first_partition_index = 0;
	size_t flash_last_partition_index = 0;
	const struct flash_partition_entry *flash_first_partition = NULL;
	const struct flash_partition_entry *flash_last_partition = NULL;
	const struct image_partition_entry *image_last_partition = NULL;

	/** Find first and last partitions */
	for (i = 0; info->partitions[i].name; i++) {
		if (!strcmp(info->partitions[i].name, info->first_sysupgrade_partition)) {
			flash_first_partition = &info->partitions[i];
			flash_first_partition_index = i;
		} else if (!strcmp(info->partitions[i].name, info->last_sysupgrade_partition)) {
			flash_last_partition = &info->partitions[i];
			flash_last_partition_index = i;
		}
	}

	assert(flash_first_partition && flash_last_partition);
	assert(flash_first_partition_index < flash_last_partition_index);

	/** Find last partition from image to calculate needed size */
	for (i = 0; image_parts[i].name; i++) {
		if (!strcmp(image_parts[i].name, info->last_sysupgrade_partition)) {
			image_last_partition = &image_parts[i];
			break;
		}
	}

	assert(image_last_partition);

	*len = flash_last_partition->base - flash_first_partition->base + image_last_partition->size;

	uint8_t *image = malloc(*len);
	if (!image)
		error(1, errno, "malloc");

	memset(image, 0xff, *len);

	for (i = flash_first_partition_index; i <= flash_last_partition_index; i++) {
		for (j = 0; image_parts[j].name; j++) {
			if (!strcmp(info->partitions[i].name, image_parts[j].name)) {
				if (image_parts[j].size > info->partitions[i].size)
					error(1, 0, "%s partition too big (more than %u bytes)", info->partitions[i].name, (unsigned)info->partitions[i].size);
				memcpy(image + info->partitions[i].base - flash_first_partition->base, image_parts[j].data, image_parts[j].size);
				break;
			}

			assert(image_parts[j].name);
		}
	}

	return image;
}

/** Generates an image according to a given layout and writes it to a file */
static void build_image(const char *output,
		const char *kernel_image,
		const char *rootfs_image,
		uint32_t rev,
		bool add_jffs2_eof,
		bool sysupgrade,
		const struct device_info *info) {
	struct image_partition_entry parts[6] = {};

	parts[0] = make_partition_table(info->partitions);
	parts[1] = make_soft_version(rev);
	parts[2] = make_support_list(info);
	parts[3] = read_file("os-image", kernel_image, false);
	parts[4] = read_file("file-system", rootfs_image, add_jffs2_eof);

	size_t len;
	void *image;
	if (sysupgrade)
		image = generate_sysupgrade_image(info, parts, &len);
	else
		image = generate_factory_image(info, parts, &len);

	FILE *file = fopen(output, "wb");
	if (!file)
		error(1, errno, "unable to open output file");

	if (fwrite(image, len, 1, file) != 1)
		error(1, 0, "unable to write output file");

	fclose(file);

	free(image);

	size_t i;
	for (i = 0; parts[i].name; i++)
		free_image_partition(parts[i]);
}

/** Usage output */
static void usage(const char *argv0) {
	fprintf(stderr,
		"Usage: %s [OPTIONS...]\n"
		"\n"
		"Options:\n"
		"  -B <board>      create image for the board specified with <board>\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 <rev>        sets the revision number to <rev>\n"
		"  -j              add jffs2 end-of-filesystem markers\n"
		"  -S              create sysupgrade instead of factory image\n"
		"  -h              show this help\n",
		argv0
	);
};


static const struct device_info *find_board(const char *id)
{
	struct device_info *board = NULL;

	for (board = boards; board->id != NULL; board++)
		if (strcasecmp(id, board->id) == 0)
			return board;

	return NULL;
}

int main(int argc, char *argv[]) {
	const char *board = NULL, *kernel_image = NULL, *rootfs_image = NULL, *output = NULL;
	bool add_jffs2_eof = false, sysupgrade = false;
	unsigned rev = 0;
	const struct device_info *info;

	while (true) {
		int c;

		c = getopt(argc, argv, "B:k:r:o:V:jSh");
		if (c == -1)
			break;

		switch (c) {
		case 'B':
			board = optarg;
			break;

		case 'k':
			kernel_image = optarg;
			break;

		case 'r':
			rootfs_image = optarg;
			break;

		case 'o':
			output = optarg;
			break;

		case 'V':
			sscanf(optarg, "r%u", &rev);
			break;

		case 'j':
			add_jffs2_eof = true;
			break;

		case 'S':
			sysupgrade = true;
			break;

		case 'h':
			usage(argv[0]);
			return 0;

		default:
			usage(argv[0]);
			return 1;
		}
	}

	if (!board)
		error(1, 0, "no board has been specified");
	if (!kernel_image)
		error(1, 0, "no kernel image has been specified");
	if (!rootfs_image)
		error(1, 0, "no rootfs image has been specified");
	if (!output)
		error(1, 0, "no output filename has been specified");

	info = find_board(board);

	if (info == NULL)
		error(1, 0, "unsupported board %s", board);

	build_image(output, kernel_image, rootfs_image, rev, add_jffs2_eof, sysupgrade, info);

	return 0;
}