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/*
* (C) Copyright 2009 Marco Stornelli
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <asm/page.h>
#ifdef MTD_OLD
#include <stdint.h>
#include <linux/mtd/mtd.h>
#else
#define __user /* nothing */
#include <mtd/mtd-user.h>
#endif
#include <sha1.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <image.h>
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
extern unsigned long crc32(unsigned long crc, const char *buf, unsigned int len);
static void usage(void);
static int image_verify_header(char *ptr, int fd);
static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start);
char *cmdname;
char *devicefile;
unsigned int sectorcount = 0;
int sflag = 0;
unsigned int sectoroffset = 0;
unsigned int sectorsize = 0;
int cflag = 0;
int main (int argc, char **argv)
{
int fd = -1, err = 0, readbyte = 0, j;
struct mtd_info_user mtdinfo;
char buf[sizeof(image_header_t)];
int found = 0;
cmdname = *argv;
while (--argc > 0 && **++argv == '-') {
while (*++*argv) {
switch (**argv) {
case 'c':
if (--argc <= 0)
usage ();
sectorcount = (unsigned int)atoi(*++argv);
cflag = 1;
goto NXTARG;
case 'o':
if (--argc <= 0)
usage ();
sectoroffset = (unsigned int)atoi(*++argv);
goto NXTARG;
case 's':
if (--argc <= 0)
usage ();
sectorsize = (unsigned int)atoi(*++argv);
sflag = 1;
goto NXTARG;
default:
usage ();
}
}
NXTARG: ;
}
if (argc != 1 || cflag == 0 || sflag == 0)
usage();
devicefile = *argv;
fd = open(devicefile, O_RDONLY);
if (fd < 0) {
fprintf (stderr, "%s: Can't open %s: %s\n",
cmdname, devicefile, strerror(errno));
exit(EXIT_FAILURE);
}
err = ioctl(fd, MEMGETINFO, &mtdinfo);
if (err < 0) {
fprintf(stderr, "%s: Cannot get MTD information: %s\n",cmdname,
strerror(errno));
exit(EXIT_FAILURE);
}
if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) {
fprintf(stderr, "%s: Unsupported flash type %u\n",
cmdname, mtdinfo.type);
exit(EXIT_FAILURE);
}
if (sectorsize * sectorcount != mtdinfo.size) {
fprintf(stderr, "%s: Partition size (%d) incompatible with "
"sector size and count\n", cmdname, mtdinfo.size);
exit(EXIT_FAILURE);
}
if (sectorsize * sectoroffset >= mtdinfo.size) {
fprintf(stderr, "%s: Partition size (%d) incompatible with "
"sector offset given\n", cmdname, mtdinfo.size);
exit(EXIT_FAILURE);
}
if (sectoroffset > sectorcount - 1) {
fprintf(stderr, "%s: Sector offset cannot be grater than "
"sector count minus one\n", cmdname);
exit(EXIT_FAILURE);
}
printf("Searching....\n");
for (j = sectoroffset; j < sectorcount; ++j) {
if (lseek(fd, j*sectorsize, SEEK_SET) != j*sectorsize) {
fprintf(stderr, "%s: lseek failure: %s\n",
cmdname, strerror(errno));
exit(EXIT_FAILURE);
}
err = flash_bad_block(fd, mtdinfo.type, j*sectorsize);
if (err < 0)
exit(EXIT_FAILURE);
if (err)
continue; /* Skip and jump to next */
readbyte = read(fd, buf, sizeof(image_header_t));
if (readbyte != sizeof(image_header_t)) {
fprintf(stderr, "%s: Can't read from device: %s\n",
cmdname, strerror(errno));
exit(EXIT_FAILURE);
}
if (fdt_check_header(buf)) {
/* old-style image */
if (image_verify_header(buf, fd)) {
found = 1;
image_print_contents((image_header_t *)buf);
}
} else {
/* FIT image */
fit_print_contents(buf);
}
}
close(fd);
if(!found)
printf("No images found\n");
exit(EXIT_SUCCESS);
}
void usage()
{
fprintf (stderr, "Usage:\n"
" %s [-o offset] -s size -c count device\n"
" -o ==> number of sectors to use as offset\n"
" -c ==> number of sectors\n"
" -s ==> size of sectors (byte)\n",
cmdname);
exit(EXIT_FAILURE);
}
static int image_verify_header(char *ptr, int fd)
{
int len, nread;
char *data;
uint32_t checksum;
image_header_t *hdr = (image_header_t *)ptr;
char buf[PAGE_SIZE];
if (image_get_magic(hdr) != IH_MAGIC)
return 0;
data = (char *)hdr;
len = image_get_header_size();
checksum = image_get_hcrc(hdr);
hdr->ih_hcrc = htonl(0); /* clear for re-calculation */
if (crc32(0, data, len) != checksum) {
fprintf(stderr,
"%s: Maybe image found but it has bad header checksum!\n",
cmdname);
return 0;
}
len = image_get_size(hdr);
checksum = 0;
while (len > 0) {
nread = read(fd, buf, MIN(len,PAGE_SIZE));
if (nread != MIN(len,PAGE_SIZE)) {
fprintf(stderr,
"%s: Error while reading: %s\n",
cmdname, strerror(errno));
exit(EXIT_FAILURE);
}
checksum = crc32(checksum, buf, nread);
len -= nread;
}
if (checksum != image_get_dcrc(hdr)) {
fprintf (stderr,
"%s: Maybe image found but it has corrupted data!\n",
cmdname);
return 0;
}
return 1;
}
/*
* Test for bad block on NAND, just returns 0 on NOR, on NAND:
* 0 - block is good
* > 0 - block is bad
* < 0 - failed to test
*/
static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start)
{
if (mtd_type == MTD_NANDFLASH) {
int badblock = ioctl(fd, MEMGETBADBLOCK, &start);
if (badblock < 0) {
fprintf(stderr,"%s: Cannot read bad block mark: %s\n",
cmdname, strerror(errno));
return badblock;
}
if (badblock) {
return badblock;
}
}
return 0;
}
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