e0b5ca172d12822b1d18c725f4c661e7d2caad2a
4 * Copyright (C) 2005 Mike Baker
5 * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
6 * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
7 * Copyright (C) 2016 Stijn Tintel <stijn@linux-ipv6.be>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 #include <arpa/inet.h>
36 #include <sys/ioctl.h>
37 #include <mtd/mtd-user.h>
42 #if __BYTE_ORDER == __BIG_ENDIAN
43 #define STORE32_LE(X) ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
44 #elif __BYTE_ORDER == __LITTLE_ENDIAN
45 #define STORE32_LE(X) (X)
47 #error unknown endianness!
50 ssize_t
pread(int fd
, void *buf
, size_t count
, off_t offset
);
51 ssize_t
pwrite(int fd
, const void *buf
, size_t count
, off_t offset
);
54 wrgg_fix_md5(struct wrgg03_header
*shdr
, int fd
, size_t data_offset
, size_t data_size
)
59 unsigned char digest
[16];
63 buf
= malloc(data_size
);
69 res
= pread(fd
, buf
, data_size
, data_offset
);
70 if (res
!= data_size
) {
77 MD5_Update(&ctx
, (char *)&shdr
->offset
, sizeof(shdr
->offset
));
78 MD5_Update(&ctx
, (char *)&shdr
->dev_name
, sizeof(shdr
->dev_name
));
79 MD5_Update(&ctx
, buf
, data_size
);
80 MD5_Final(digest
, &ctx
);
82 if (!memcmp(digest
, shdr
->digest
, sizeof(digest
))) {
84 fprintf(stderr
, "the header is fixed already\n");
89 fprintf(stderr
, "new size:%u, new MD5: ", data_size
);
90 for (i
= 0; i
< sizeof(digest
); i
++)
91 fprintf(stderr
, "%02x", digest
[i
]);
93 fprintf(stderr
, "\n");
96 /* update the size in the image */
97 shdr
->size
= htonl(data_size
);
99 /* update the checksum in the image */
100 memcpy(shdr
->digest
, digest
, sizeof(digest
));
109 mtd_fixwrgg(const char *mtd
, size_t offset
, size_t data_size
)
116 struct wrgg03_header
*shdr
;
119 fprintf(stderr
, "Trying to fix WRGG header in %s at 0x%x...\n",
122 block_offset
= offset
& ~(erasesize
- 1);
123 offset
-= block_offset
;
125 fd
= mtd_check_open(mtd
);
127 fprintf(stderr
, "Could not open mtd device: %s\n", mtd
);
131 if (block_offset
+ erasesize
> mtdsize
) {
132 fprintf(stderr
, "Offset too large, device size 0x%x\n",
137 first_block
= malloc(erasesize
);
143 res
= pread(fd
, first_block
, erasesize
, block_offset
);
144 if (res
!= erasesize
) {
149 shdr
= (struct wrgg03_header
*)(first_block
+ offset
);
150 if (shdr
->magic1
!= htonl(STORE32_LE(WRGG03_MAGIC
))) {
151 fprintf(stderr
, "magic1 %x\n", shdr
->magic1
);
152 fprintf(stderr
, "htonl(WRGG03_MAGIC) %x\n", WRGG03_MAGIC
);
153 fprintf(stderr
, "No WRGG header found\n");
155 } else if (!ntohl(shdr
->size
)) {
156 fprintf(stderr
, "WRGG entity with empty image\n");
160 data_offset
= offset
+ sizeof(struct wrgg03_header
);
162 data_size
= mtdsize
- data_offset
;
163 if (data_size
> ntohl(shdr
->size
))
164 data_size
= ntohl(shdr
->size
);
165 if (wrgg_fix_md5(shdr
, fd
, data_offset
, data_size
))
168 if (mtd_erase_block(fd
, block_offset
)) {
169 fprintf(stderr
, "Can't erease block at 0x%x (%s)\n",
170 block_offset
, strerror(errno
));
175 fprintf(stderr
, "Rewriting block at 0x%x\n", block_offset
);
177 if (pwrite(fd
, first_block
, erasesize
, block_offset
) != erasesize
) {
178 fprintf(stderr
, "Error writing block (%s)\n", strerror(errno
));
183 fprintf(stderr
, "Done.\n");