mtd: add fixwrg command
Add a command to fix WRG headers, based on wrgg.c. Signed-off-by: George Hopkins <george-hopkins@null.net>v19.07.3_mercusys_ac12_duma
George Hopkins
7 years ago
committed by
John Crispin
parent
5c7a58764e
commit
5203355062
@ -0,0 +1,208 @@
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/*
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* wrg.c
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*
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* Copyright (C) 2005 Mike Baker
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* Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
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* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2016 Stijn Tintel <stijn@linux-ipv6.be>
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* Copyright (C) 2017 George Hopkins <george-hopkins@null.net>
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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 <byteswap.h>
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#include <endian.h>
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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 "md5.h"
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#if !defined(__BYTE_ORDER)
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#error "Unknown byte order"
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#endif
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define cpu_to_le32(x) bswap_32(x)
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#define le32_to_cpu(x) bswap_32(x)
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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#define cpu_to_le32(x) (x)
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#define le32_to_cpu(x) (x)
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#else
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#error "Unsupported endianness"
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#endif
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#define WRG_MAGIC 0x20040220
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struct wrg_header {
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char signature[32];
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uint32_t magic1;
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uint32_t magic2;
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uint32_t size;
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uint32_t offset;
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char devname[32];
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char digest[16];
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} __attribute__ ((packed));
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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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wrg_fix_md5(struct wrg_header *shdr, int fd, size_t data_offset, size_t data_size)
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{
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char *buf;
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ssize_t res;
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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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int err = 0;
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buf = malloc(data_size);
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if (!buf) {
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err = -ENOMEM;
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goto err_out;
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}
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res = pread(fd, buf, data_size, data_offset);
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if (res != data_size) {
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perror("pread");
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err = -EIO;
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goto err_free;
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}
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MD5_Init(&ctx);
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MD5_Update(&ctx, (char *)&shdr->offset, sizeof(shdr->offset));
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MD5_Update(&ctx, (char *)&shdr->devname, sizeof(shdr->devname));
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MD5_Update(&ctx, buf, data_size);
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MD5_Final(digest, &ctx);
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if (!memcmp(digest, shdr->digest, 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: ", data_size);
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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 = cpu_to_le32(data_size);
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/* update the checksum in the image */
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memcpy(shdr->digest, digest, sizeof(digest));
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err_free:
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free(buf);
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err_out:
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return err;
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}
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int
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mtd_fixwrg(const char *mtd, size_t offset, size_t data_size)
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{
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int fd;
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char *first_block;
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ssize_t res;
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size_t block_offset;
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size_t data_offset;
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struct wrg_header *shdr;
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if (quiet < 2)
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fprintf(stderr, "Trying to fix WRG 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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first_block = malloc(erasesize);
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if (!first_block) {
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perror("malloc");
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exit(1);
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}
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res = pread(fd, first_block, erasesize, block_offset);
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if (res != erasesize) {
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perror("pread");
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exit(1);
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}
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shdr = (struct wrg_header *)(first_block + offset);
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if (le32_to_cpu(shdr->magic1) != WRG_MAGIC) {
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fprintf(stderr, "No WRG header found (%08x != %08x)\n",
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le32_to_cpu(shdr->magic1), WRG_MAGIC);
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exit(1);
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} else if (!le32_to_cpu(shdr->size)) {
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fprintf(stderr, "WRG entity with empty image\n");
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exit(1);
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}
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data_offset = offset + sizeof(struct wrg_header);
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if (!data_size)
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data_size = mtdsize - data_offset;
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if (data_size > le32_to_cpu(shdr->size))
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data_size = le32_to_cpu(shdr->size);
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if (wrg_fix_md5(shdr, fd, data_offset, data_size))
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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, first_block, 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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