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");