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mtd: add fixwrg command

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Add a command to fix WRG headers, based on wrgg.c.

Signed-off-by: George Hopkins <george-hopkins@null.net>
This commit is contained in:
George Hopkins 2017-10-28 14:08:38 +02:00 committed by John Crispin
parent 5c7a58764e
commit 5203355062
4 changed files with 233 additions and 3 deletions
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1
package/system/mtd/src/Makefile
View File

@ -4,6 +4,7 @@ LDFLAGS += -lubox
obj = mtd.o jffs2.o crc32.o md5.o
obj.seama = seama.o md5.o
obj.wrg = wrg.o md5.o
obj.wrgg = wrgg.o md5.o
obj.ar71xx = trx.o $(obj.seama) $(obj.wrgg)
obj.brcm = trx.o

26
package/system/mtd/src/mtd.c
View File

@ -54,6 +54,7 @@
#define TRX_MAGIC 0x48445230 /* "HDR0" */
#define SEAMA_MAGIC 0x5ea3a417
#define WRG_MAGIC 0x20040220
#define WRGG03_MAGIC 0x20080321
#if !defined(__BYTE_ORDER)
@ -76,6 +77,7 @@ enum mtd_image_format {
MTD_IMAGE_FORMAT_UNKNOWN,
MTD_IMAGE_FORMAT_TRX,
MTD_IMAGE_FORMAT_SEAMA,
MTD_IMAGE_FORMAT_WRG,
MTD_IMAGE_FORMAT_WRGG03,
};
@ -205,6 +207,8 @@ image_check(int imagefd, const char *mtd)
imageformat = MTD_IMAGE_FORMAT_TRX;
else if (be32_to_cpu(magic) == SEAMA_MAGIC)
imageformat = MTD_IMAGE_FORMAT_SEAMA;
else if (le32_to_cpu(magic) == WRG_MAGIC)
imageformat = MTD_IMAGE_FORMAT_WRG;
else if (le32_to_cpu(magic) == WRGG03_MAGIC)
imageformat = MTD_IMAGE_FORMAT_WRGG03;
@ -214,7 +218,7 @@ image_check(int imagefd, const char *mtd)
ret = trx_check(imagefd, mtd, buf, &buflen);
break;
case MTD_IMAGE_FORMAT_SEAMA:
break;
case MTD_IMAGE_FORMAT_WRG:
case MTD_IMAGE_FORMAT_WRGG03:
break;
default:
@ -685,6 +689,10 @@ resume:
if (mtd_fixseama)
mtd_fixseama(mtd, 0, 0);
break;
case MTD_IMAGE_FORMAT_WRG:
if (mtd_fixwrg)
mtd_fixwrg(mtd, 0, 0);
break;
case MTD_IMAGE_FORMAT_WRGG03:
if (mtd_fixwrgg)
mtd_fixwrgg(mtd, 0, 0);
@ -734,6 +742,10 @@ static void usage(void)
fprintf(stderr,
" fixseama fix the checksum in a seama header on first boot\n");
}
if (mtd_fixwrg) {
fprintf(stderr,
" fixwrg fix the checksum in a wrg header on first boot\n");
}
if (mtd_fixwrgg) {
fprintf(stderr,
" fixwrgg fix the checksum in a wrgg header on first boot\n");
@ -755,9 +767,9 @@ static void usage(void)
fprintf(stderr,
" -o offset offset of the image header in the partition(for fixtrx)\n");
}
if (mtd_fixtrx || mtd_fixseama || mtd_fixwrgg) {
if (mtd_fixtrx || mtd_fixseama || mtd_fixwrg || mtd_fixwrgg) {
fprintf(stderr,
" -c datasize amount of data to be used for checksum calculation (for fixtrx / fixseama / fixwrgg)\n");
" -c datasize amount of data to be used for checksum calculation (for fixtrx / fixseama / fixwrg / fixwrgg)\n");
}
fprintf(stderr,
#ifdef FIS_SUPPORT
@ -798,6 +810,7 @@ int main (int argc, char **argv)
CMD_JFFS2WRITE,
CMD_FIXTRX,
CMD_FIXSEAMA,
CMD_FIXWRG,
CMD_FIXWRGG,
CMD_VERIFY,
CMD_DUMP,
@ -913,6 +926,9 @@ int main (int argc, char **argv)
} else if (((strcmp(argv[0], "fixseama") == 0) && (argc == 2)) && mtd_fixseama) {
cmd = CMD_FIXSEAMA;
device = argv[1];
} else if (((strcmp(argv[0], "fixwrg") == 0) && (argc == 2)) && mtd_fixwrg) {
cmd = CMD_FIXWRG;
device = argv[1];
} else if (((strcmp(argv[0], "fixwrgg") == 0) && (argc == 2)) && mtd_fixwrgg) {
cmd = CMD_FIXWRGG;
device = argv[1];
@ -1012,6 +1028,10 @@ int main (int argc, char **argv)
if (mtd_fixseama)
mtd_fixseama(device, 0, data_size);
break;
case CMD_FIXWRG:
if (mtd_fixwrg)
mtd_fixwrg(device, 0, data_size);
break;
case CMD_FIXWRGG:
if (mtd_fixwrgg)
mtd_fixwrgg(device, 0, data_size);

1
package/system/mtd/src/mtd.h
View File

@ -27,6 +27,7 @@ extern int trx_fixup(int fd, const char *name) __attribute__ ((weak));
extern int trx_check(int imagefd, const char *mtd, char *buf, int *len) __attribute__ ((weak));
extern int mtd_fixtrx(const char *mtd, size_t offset, size_t data_size) __attribute__ ((weak));
extern int mtd_fixseama(const char *mtd, size_t offset, size_t data_size) __attribute__ ((weak));
extern int mtd_fixwrg(const char *mtd, size_t offset, size_t data_size) __attribute__ ((weak));
extern int mtd_fixwrgg(const char *mtd, size_t offset, size_t data_size) __attribute__ ((weak));
extern int mtd_resetbc(const char *mtd) __attribute__ ((weak));
#endif /* __mtd_h */

208
package/system/mtd/src/wrg.c Normal file
View File

@ -0,0 +1,208 @@
/*
* wrg.c
*
* Copyright (C) 2005 Mike Baker
* Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2016 Stijn Tintel <stijn@linux-ipv6.be>
* Copyright (C) 2017 George Hopkins <george-hopkins@null.net>
*
* 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 <byteswap.h>
#include <endian.h>
#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 "md5.h"
#if !defined(__BYTE_ORDER)
#error "Unknown byte order"
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_le32(x) bswap_32(x)
#define le32_to_cpu(x) bswap_32(x)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define cpu_to_le32(x) (x)
#define le32_to_cpu(x) (x)
#else
#error "Unsupported endianness"
#endif
#define WRG_MAGIC 0x20040220
struct wrg_header {
char signature[32];
uint32_t magic1;
uint32_t magic2;
uint32_t size;
uint32_t offset;
char devname[32];
char digest[16];
} __attribute__ ((packed));
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
wrg_fix_md5(struct wrg_header *shdr, int fd, size_t data_offset, size_t data_size)
{
char *buf;
ssize_t res;
MD5_CTX ctx;
unsigned char digest[16];
int i;
int err = 0;
buf = malloc(data_size);
if (!buf) {
err = -ENOMEM;
goto err_out;
}
res = pread(fd, buf, data_size, data_offset);
if (res != data_size) {
perror("pread");
err = -EIO;
goto err_free;
}
MD5_Init(&ctx);
MD5_Update(&ctx, (char *)&shdr->offset, sizeof(shdr->offset));
MD5_Update(&ctx, (char *)&shdr->devname, sizeof(shdr->devname));
MD5_Update(&ctx, buf, data_size);
MD5_Final(digest, &ctx);
if (!memcmp(digest, shdr->digest, 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: ", data_size);
for (i = 0; i < sizeof(digest); i++)
fprintf(stderr, "%02x", digest[i]);
fprintf(stderr, "\n");
}
/* update the size in the image */
shdr->size = cpu_to_le32(data_size);
/* update the checksum in the image */
memcpy(shdr->digest, digest, sizeof(digest));
err_free:
free(buf);
err_out:
return err;
}
int
mtd_fixwrg(const char *mtd, size_t offset, size_t data_size)
{
int fd;
char *first_block;
ssize_t res;
size_t block_offset;
size_t data_offset;
struct wrg_header *shdr;
if (quiet < 2)
fprintf(stderr, "Trying to fix WRG 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 wrg_header *)(first_block + offset);
if (le32_to_cpu(shdr->magic1) != WRG_MAGIC) {
fprintf(stderr, "No WRG header found (%08x != %08x)\n",
le32_to_cpu(shdr->magic1), WRG_MAGIC);
exit(1);
} else if (!le32_to_cpu(shdr->size)) {
fprintf(stderr, "WRG entity with empty image\n");
exit(1);
}
data_offset = offset + sizeof(struct wrg_header);
if (!data_size)
data_size = mtdsize - data_offset;
if (data_size > le32_to_cpu(shdr->size))
data_size = le32_to_cpu(shdr->size);
if (wrg_fix_md5(shdr, fd, data_offset, data_size))
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, first_block, 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;
}