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/*
* seama.c
*
* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
*
* Based on the trx fixup code:
* Copyright (C) 2005 Mike Baker
* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <mtd/mtd-user.h>
#include "mtd.h"
#include "seama.h"
#include "md5.h"
#if __BYTE_ORDER == __BIG_ENDIAN
#define STORE32_LE(X) ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define STORE32_LE(X) (X)
#else
#error unknown endianness!
#endif
ssize_t pread(int fd, void *buf, size_t count, off_t offset);
ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
int
seama_fix_md5(char *buf, size_t len)
{
struct seama_hdr *shdr = (struct seama_hdr *) buf;
char *data;
size_t msize;
size_t isize;
MD5_CTX ctx;
unsigned char digest[16];
int i;
if (len < sizeof(struct seama_hdr))
return -1;
isize = ntohl(shdr->size);
msize = ntohs(shdr->metasize);
if (isize == 0) {
/* the image contains no checksum */
return -1;
}
len -= sizeof(struct seama_hdr) + sizeof(digest) + msize;
if (isize > len)
isize = len;
data = buf + sizeof(struct seama_hdr) + sizeof(digest) + msize;
MD5_Init(&ctx);
MD5_Update(&ctx, data, isize);
MD5_Final(digest, &ctx);
if (!memcmp(digest, &buf[sizeof(struct seama_hdr)], sizeof(digest))) {
if (quiet < 2)
fprintf(stderr, "the header is fixed already\n");
return -1;
}
if (quiet < 2) {
fprintf(stderr, "new size:%u, new MD5: ", isize);
for (i = 0; i < sizeof(digest); i++)
fprintf(stderr, "%02x", digest[i]);
fprintf(stderr, "\n");
}
/* update the size in the image */
shdr->size = htonl(isize);
/* update the checksum in the image */
for (i = 0; i < sizeof(digest); i++)
buf[sizeof(struct seama_hdr) + i] = digest[i];
return 0;
}
int
mtd_fixseama(const char *mtd, size_t offset)
{
int fd;
char *first_block;
char *buf;
ssize_t res;
size_t block_offset;
struct seama_hdr *shdr;
if (quiet < 2)
fprintf(stderr, "Trying to fix SEAMA header in %s at 0x%x...\n",
mtd, offset);
block_offset = offset & ~(erasesize - 1);
offset -= block_offset;
fd = mtd_check_open(mtd);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
exit(1);
}
if (block_offset + erasesize > mtdsize) {
fprintf(stderr, "Offset too large, device size 0x%x\n",
mtdsize);
exit(1);
}
first_block = malloc(erasesize);
if (!first_block) {
perror("malloc");
exit(1);
}
res = pread(fd, first_block, erasesize, block_offset);
if (res != erasesize) {
perror("pread");
exit(1);
}
shdr = (struct seama_hdr *)first_block;
if (shdr->magic != htonl(SEAMA_MAGIC)) {
fprintf(stderr, "No SEAMA header found\n");
return -1;
}
buf = malloc(mtdsize);
if (!buf) {
perror("malloc");
exit(1);
}
res = pread(fd, buf, mtdsize, block_offset);
if (res != mtdsize) {
perror("pread");
exit(1);
}
if (seama_fix_md5(buf, mtdsize))
goto out;
if (mtd_erase_block(fd, block_offset)) {
fprintf(stderr, "Can't erease block at 0x%x (%s)\n",
block_offset, strerror(errno));
exit(1);
}
if (quiet < 2)
fprintf(stderr, "Rewriting block at 0x%x\n", block_offset);
if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
exit(1);
}
if (quiet < 2)
fprintf(stderr, "Done.\n");
out:
close (fd);
sync();
return 0;
}
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