Based on fixseama. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be> Acked-by: John Crispin <john@phrozen.org>master
Stijn Tintel
8 years ago
parent
dec29082e0
commit
9dfed03c35
@ -0,0 +1,190 @@ |
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/*
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* wrgg.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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* |
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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 <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 "wrgg.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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wrgg_fix_md5(struct wrgg03_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->dev_name, sizeof(shdr->dev_name)); |
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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 = htonl(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_fixwrgg(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 wrgg03_header *shdr; |
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if (quiet < 2) |
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fprintf(stderr, "Trying to fix WRGG 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 wrgg03_header *)(first_block + offset); |
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if (shdr->magic1 != htonl(STORE32_LE(WRGG03_MAGIC))) { |
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fprintf(stderr, "magic1 %x\n", shdr->magic1); |
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fprintf(stderr, "htonl(WRGG03_MAGIC) %x\n", WRGG03_MAGIC); |
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fprintf(stderr, "No WRGG header found\n"); |
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exit(1); |
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} else if (!ntohl(shdr->size)) { |
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fprintf(stderr, "WRGG entity with empty image\n"); |
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exit(1); |
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} |
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data_offset = offset + sizeof(struct wrgg03_header); |
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if (!data_size) |
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data_size = mtdsize - data_offset; |
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if (data_size > ntohl(shdr->size)) |
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data_size = ntohl(shdr->size); |
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if (wrgg_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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@ -0,0 +1,20 @@ |
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#ifndef __wrgg_h |
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#define __wrgg_h |
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#define WRGG03_MAGIC 0x20080321 |
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struct wrgg03_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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char version[16]; |
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char model[16]; |
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uint32_t flag[2]; |
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uint32_t reserve[2]; |
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char buildno[16]; |
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uint32_t size; |
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uint32_t offset; |
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char dev_name[32]; |
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char digest[16]; |
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} __attribute__ ((packed)); |
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#endif /* __wrgg_h */ |
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