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@openwrt.org>
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(char *buf, size_t len)
56 struct seama_hdr *shdr;
61 unsigned char digest[16];
64 if (len < sizeof(struct seama_hdr))
67 shdr = (struct seama_hdr *) buf;
68 if (shdr->magic != htonl(SEAMA_MAGIC)) {
69 fprintf(stderr, "no SEAMA header found\n");
73 isize = ntohl(shdr->size);
74 msize = ntohs(shdr->metasize);
76 /* the image contains no checksum */
80 len -= sizeof(struct seama_hdr) + sizeof(digest) + msize;
84 data = buf + sizeof(struct seama_hdr) + sizeof(digest) + msize;
87 MD5_Update(&ctx, data, isize);
88 MD5_Final(digest, &ctx);
90 if (!memcmp(digest, &buf[sizeof(struct seama_hdr)], sizeof(digest))) {
92 fprintf(stderr, "the header is fixed already\n");
97 fprintf(stderr, "new size:%u, new MD5: ", isize);
98 for (i = 0; i < sizeof(digest); i++)
99 fprintf(stderr, "%02x", digest[i]);
101 fprintf(stderr, "\n");
104 /* update the size in the image */
105 shdr->size = htonl(isize);
107 /* update the checksum in the image */
108 for (i = 0; i < sizeof(digest); i++)
109 buf[sizeof(struct seama_hdr) + i] = digest[i];
115 mtd_fixseama(const char *mtd, size_t offset)
123 fprintf(stderr, "Trying to fix SEAMA header in %s at 0x%x...\n",
126 block_offset = offset & ~(erasesize - 1);
127 offset -= block_offset;
129 fd = mtd_check_open(mtd);
131 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
135 if (block_offset + erasesize > mtdsize) {
136 fprintf(stderr, "Offset too large, device size 0x%x\n",
141 buf = malloc(mtdsize);
147 res = pread(fd, buf, mtdsize, block_offset);
148 if (res != mtdsize) {
153 if (seama_fix_md5(buf, mtdsize))
156 if (mtd_erase_block(fd, block_offset)) {
157 fprintf(stderr, "Can't erease block at 0x%x (%s)\n",
158 block_offset, strerror(errno));
163 fprintf(stderr, "Rewriting block at 0x%x\n", block_offset);
165 if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
166 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
171 fprintf(stderr, "Done.\n");