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.
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 seama_fix_md5(struct seama_entity_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, buf, data_size);
78 MD5_Final(digest, &ctx);
80 if (!memcmp(digest, shdr->md5, sizeof(digest))) {
82 fprintf(stderr, "the header is fixed already\n");
87 fprintf(stderr, "new size:%u, new MD5: ", data_size);
88 for (i = 0; i < sizeof(digest); i++)
89 fprintf(stderr, "%02x", digest[i]);
91 fprintf(stderr, "\n");
94 /* update the size in the image */
95 shdr->size = htonl(data_size);
97 /* update the checksum in the image */
98 memcpy(shdr->md5, digest, sizeof(digest));
107 mtd_fixseama(const char *mtd, size_t offset, size_t data_size)
114 struct seama_entity_header *shdr;
117 fprintf(stderr, "Trying to fix SEAMA header in %s at 0x%x...\n",
120 block_offset = offset & ~(erasesize - 1);
121 offset -= block_offset;
123 fd = mtd_check_open(mtd);
125 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
129 if (block_offset + erasesize > mtdsize) {
130 fprintf(stderr, "Offset too large, device size 0x%x\n",
135 first_block = malloc(erasesize);
141 res = pread(fd, first_block, erasesize, block_offset);
142 if (res != erasesize) {
147 shdr = (struct seama_entity_header *)(first_block + offset);
148 if (shdr->magic != htonl(SEAMA_MAGIC)) {
149 fprintf(stderr, "No SEAMA header found\n");
151 } else if (!ntohl(shdr->size)) {
152 fprintf(stderr, "Seama entity with empty image\n");
156 data_offset = offset + sizeof(struct seama_entity_header) + ntohs(shdr->metasize);
158 data_size = mtdsize - data_offset;
159 if (data_size > ntohl(shdr->size))
160 data_size = ntohl(shdr->size);
161 if (seama_fix_md5(shdr, fd, data_offset, data_size))
164 if (mtd_erase_block(fd, block_offset)) {
165 fprintf(stderr, "Can't erease block at 0x%x (%s)\n",
166 block_offset, strerror(errno));
171 fprintf(stderr, "Rewriting block at 0x%x\n", block_offset);
173 if (pwrite(fd, first_block, erasesize, block_offset) != erasesize) {
174 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
179 fprintf(stderr, "Done.\n");