4 * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
6 * Based on the trx fixup code:
7 * Copyright (C) 2005 Mike Baker
8 * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
35 #include <arpa/inet.h>
37 #include <sys/ioctl.h>
38 #include <mtd/mtd-user.h>
43 #if __BYTE_ORDER == __BIG_ENDIAN
44 #define STORE32_LE(X) ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
45 #elif __BYTE_ORDER == __LITTLE_ENDIAN
46 #define STORE32_LE(X) (X)
48 #error unknown endianness!
51 ssize_t
pread(int fd
, void *buf
, size_t count
, off_t offset
);
52 ssize_t
pwrite(int fd
, const void *buf
, size_t count
, off_t offset
);
55 seama_fix_md5(struct seama_entity_header
*shdr
, int fd
, size_t data_offset
, size_t data_size
)
60 unsigned char digest
[16];
64 buf
= malloc(data_size
);
70 res
= pread(fd
, buf
, data_size
, data_offset
);
71 if (res
!= data_size
) {
78 MD5_Update(&ctx
, buf
, data_size
);
79 MD5_Final(digest
, &ctx
);
81 if (!memcmp(digest
, shdr
->md5
, sizeof(digest
))) {
83 fprintf(stderr
, "the header is fixed already\n");
88 fprintf(stderr
, "new size:%u, new MD5: ", data_size
);
89 for (i
= 0; i
< sizeof(digest
); i
++)
90 fprintf(stderr
, "%02x", digest
[i
]);
92 fprintf(stderr
, "\n");
95 /* update the size in the image */
96 shdr
->size
= htonl(data_size
);
98 /* update the checksum in the image */
99 memcpy(shdr
->md5
, digest
, sizeof(digest
));
108 mtd_fixseama(const char *mtd
, size_t offset
, size_t data_size
)
115 struct seama_entity_header
*shdr
;
118 fprintf(stderr
, "Trying to fix SEAMA header in %s at 0x%x...\n",
121 block_offset
= offset
& ~(erasesize
- 1);
122 offset
-= block_offset
;
124 fd
= mtd_check_open(mtd
);
126 fprintf(stderr
, "Could not open mtd device: %s\n", mtd
);
130 if (block_offset
+ erasesize
> mtdsize
) {
131 fprintf(stderr
, "Offset too large, device size 0x%x\n",
136 first_block
= malloc(erasesize
);
142 res
= pread(fd
, first_block
, erasesize
, block_offset
);
143 if (res
!= erasesize
) {
148 shdr
= (struct seama_entity_header
*)(first_block
+ offset
);
149 if (shdr
->magic
!= htonl(SEAMA_MAGIC
)) {
150 fprintf(stderr
, "No SEAMA header found\n");
152 } else if (!ntohl(shdr
->size
)) {
153 fprintf(stderr
, "Seama entity with empty image\n");
157 data_offset
= offset
+ sizeof(struct seama_entity_header
) + ntohs(shdr
->metasize
);
159 data_size
= mtdsize
- data_offset
;
160 if (data_size
> ntohl(shdr
->size
))
161 data_size
= ntohl(shdr
->size
);
162 if (seama_fix_md5(shdr
, fd
, data_offset
, data_size
))
165 if (mtd_erase_block(fd
, block_offset
)) {
166 fprintf(stderr
, "Can't erease block at 0x%x (%s)\n",
167 block_offset
, strerror(errno
));
172 fprintf(stderr
, "Rewriting block at 0x%x\n", block_offset
);
174 if (pwrite(fd
, first_block
, erasesize
, block_offset
) != erasesize
) {
175 fprintf(stderr
, "Error writing block (%s)\n", strerror(errno
));
180 fprintf(stderr
, "Done.\n");