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