OpenWrt – Rev 4
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/*
* trx.c
*
* Copyright (C) 2005 Mike Baker
* Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
*
* 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 <endian.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <mtd/mtd-user.h>
#include "mtd.h"
#include "crc32.h"
#define TRX_MAGIC 0x30524448 /* "HDR0" */
#define TRX_CRC32_DATA_OFFSET 12 /* First 12 bytes are not covered by CRC32 */
#define TRX_CRC32_DATA_SIZE 16
struct trx_header {
uint32_t magic; /* "HDR0" */
uint32_t len; /* Length of file including header */
uint32_t crc32; /* 32-bit CRC from flag_version to end of file */
uint32_t flag_version; /* 0:15 flags, 16:31 version */
uint32_t offsets[3]; /* Offsets of partitions from start of header */
};
#define min(x,y) ({ \
typeof(x) _x = (x); \
typeof(y) _y = (y); \
(void) (&_x == &_y); \
_x < _y ? _x : _y; })
#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
trx_fixup(int fd, const char *name)
{
struct mtd_info_user mtdInfo;
unsigned long len;
struct trx_header *trx;
void *ptr, *scan;
int bfd;
if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
fprintf(stderr, "Failed to get mtd info\n");
goto err;
}
len = mtdInfo.size;
if (mtdInfo.size <= 0) {
fprintf(stderr, "Invalid MTD device size\n");
goto err;
}
bfd = mtd_open(name, true);
ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
if (!ptr || (ptr == (void *) -1)) {
perror("mmap");
fprintf(stderr, "Mapping the TRX header failed\n");
goto err1;
}
trx = ptr;
if (trx->magic != TRX_MAGIC) {
fprintf(stderr, "TRX header not found\n");
goto err;
}
scan = ptr + offsetof(struct trx_header, flag_version);
trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
munmap(ptr, len);
close(bfd);
return 0;
err1:
close(bfd);
err:
return -1;
}
#ifndef target_ar71xx
int
trx_check(int imagefd, const char *mtd, char *buf, int *len)
{
const struct trx_header *trx = (const struct trx_header *) buf;
int fd;
if (strcmp(mtd, "firmware") != 0)
return 1;
if (*len < 32) {
*len += read(imagefd, buf + *len, 32 - *len);
if (*len < 32) {
fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
return 0;
}
}
if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
if (quiet < 2) {
fprintf(stderr, "Bad trx header\n");
fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
"Please specify the correct file or use -f to force.\n");
}
return 0;
}
/* check if image fits to mtd device */
fd = mtd_check_open(mtd);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
exit(1);
}
if(mtdsize < trx->len) {
fprintf(stderr, "Image too big for partition: %s\n", mtd);
close(fd);
return 0;
}
close(fd);
return 1;
}
#endif
int
mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
{
size_t data_offset;
int fd;
struct trx_header *trx;
char *first_block;
char *buf, *to;
ssize_t res;
size_t block_offset;
if (quiet < 2)
fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
fd = mtd_check_open(mtd);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
exit(1);
}
data_offset = offset + TRX_CRC32_DATA_OFFSET;
if (data_size)
data_size += TRX_CRC32_DATA_SIZE;
else
data_size = erasesize - TRX_CRC32_DATA_OFFSET;
block_offset = offset & ~(erasesize - 1);
offset -= block_offset;
if (data_offset + data_size > 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);
}
trx = (struct trx_header *)(first_block + offset);
if (trx->magic != STORE32_LE(0x30524448)) {
fprintf(stderr, "No trx magic found\n");
exit(1);
}
buf = malloc(data_size);
if (!buf) {
perror("malloc");
exit(1);
}
to = buf;
while (data_size) {
size_t read_block_offset = data_offset & ~(erasesize - 1);
size_t read_chunk;
read_chunk = erasesize - (data_offset & (erasesize - 1));
read_chunk = min(read_chunk, data_size);
/* Read from good blocks only to match CFE behavior */
if (!mtd_block_is_bad(fd, read_block_offset)) {
res = pread(fd, to, read_chunk, data_offset);
if (res != read_chunk) {
perror("pread");
exit(1);
}
to += read_chunk;
}
data_offset += read_chunk;
data_size -= read_chunk;
}
data_size = to - buf;
if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET) &&
trx->crc32 == STORE32_LE(crc32buf(buf, data_size))) {
if (quiet < 2)
fprintf(stderr, "Header already fixed, exiting\n");
close(fd);
return 0;
}
trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
trx->crc32 = STORE32_LE(crc32buf(buf, data_size));
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, "New crc32: 0x%x, rewriting block\n", trx->crc32);
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");
close (fd);
sync();
return 0;
}