OpenWrt – Rev 4
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/*
* Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h> /* for unlink() */
#include <libgen.h>
#include <getopt.h> /* for getopt() */
#include <stdarg.h>
#include <errno.h>
#include <sys/stat.h>
#include "cyg_crc.h"
#include <arpa/inet.h>
#include <netinet/in.h>
#define IH_MAGIC 0x27051956 /* Image Magic Number */
#define IH_NMLEN 32 /* Image Name Length */
#define UM_MAGIC 0x55525F46
#define UM_HEADER_LEN 12
/*
* all data in network byte order (aka natural aka bigendian)
*/
struct u_media_header {
uint32_t ih_magic; /* Image Header Magic Number */
uint32_t ih_hcrc; /* Image Header CRC Checksum */
uint32_t ih_time; /* Image Creation Timestamp */
uint32_t ih_size; /* Image Data Size */
uint32_t ih_load; /* Data Load Address */
uint32_t ih_ep; /* Entry Point Address */
uint32_t ih_dcrc; /* Image Data CRC Checksum */
uint8_t ih_os; /* Operating System */
uint8_t ih_arch; /* CPU architecture */
uint8_t ih_type; /* Image Type */
uint8_t ih_comp; /* Compression Type */
uint8_t ih_name[IH_NMLEN - UM_HEADER_LEN]; /* Image Name */
uint32_t ih_UMedia_magic; /* U-Media magic number */
uint32_t ih_UMedia_boardID; /* U-Media board ID */
uint8_t ih_UMedia_imageType; /* U-Media image type */
uint8_t ih_UMedia_LoadDefault; /* U-Media load to factory default setting */
uint8_t ih_UMedia_temp1; /* U-Media didn't use this tag */
uint8_t ih_UMedia_temp2; /* U-Media didn't use this tag */
} __attribute__ ((packed));
struct if_info {
char *file_name; /* name of the file */
uint32_t file_size; /* length of the file */
};
static char *progname;
static char *ofname;
static struct if_info if_info;
static int factory_defaults;
static uint32_t board_id;
static uint8_t image_type;
/*
* Message macros
*/
#define ERR(fmt, ...) do { \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt "\n", \
progname, ## __VA_ARGS__ ); \
} while (0)
#define ERRS(fmt, ...) do { \
int save = errno; \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt " (%s)\n", \
progname, ## __VA_ARGS__, strerror(save)); \
} while (0)
#define DBG(fmt, ...) do { \
fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
} while (0)
static void usage(int status)
{
FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
fprintf(stream,
"\n"
"Options:\n"
" -B <board_id> set board ID to <board_id>\n"
" -i <file> read input from the file <file>\n"
" -F load factory defaults\n"
" -o <file> write output to the file <file>\n"
" -T <type> set image type to <type>\n"
" -h show this screen\n"
);
exit(status);
}
static int str2u32(char *arg, uint32_t *val)
{
char *err = NULL;
uint32_t t;
errno=0;
t = strtoul(arg, &err, 0);
if (errno || (err==arg) || ((err != NULL) && *err)) {
return -1;
}
*val = t;
return 0;
}
static int str2u8(char *arg, uint8_t *val)
{
char *err = NULL;
uint32_t t;
errno=0;
t = strtoul(arg, &err, 0);
if (errno || (err==arg) || ((err != NULL) && *err)) {
return -1;
}
if (t > 255)
return -1;
*val = t;
return 0;
}
static int get_file_stat(struct if_info *fdata)
{
struct stat st;
int res;
if (fdata->file_name == NULL)
return 0;
res = stat(fdata->file_name, &st);
if (res){
ERRS("stat failed on %s", fdata->file_name);
return res;
}
fdata->file_size = st.st_size;
return 0;
}
static int read_to_buf(struct if_info *fdata, char *buf)
{
FILE *f;
int ret = EXIT_FAILURE;
f = fopen(fdata->file_name, "r");
if (f == NULL) {
ERRS("could not open \"%s\" for reading", fdata->file_name);
goto out;
}
errno = 0;
fread(buf, fdata->file_size, 1, f);
if (errno != 0) {
ERRS("unable to read from file \"%s\"", fdata->file_name);
goto out_close;
}
ret = EXIT_SUCCESS;
out_close:
fclose(f);
out:
return ret;
}
static int check_options(void)
{
int ret;
if (ofname == NULL) {
ERR("no %s specified", "output file");
return -1;
}
if (if_info.file_name == NULL) {
ERR("no %s specified", "input file");
return -1;
}
ret = get_file_stat(&if_info);
if (ret)
return ret;
return 0;
}
static int write_fw(char *data, int len)
{
FILE *f;
int ret = EXIT_FAILURE;
f = fopen(ofname, "w");
if (f == NULL) {
ERRS("could not open \"%s\" for writing", ofname);
goto out;
}
errno = 0;
fwrite(data, len, 1, f);
if (errno) {
ERRS("unable to write output file");
goto out_flush;
}
ret = EXIT_SUCCESS;
out_flush:
fflush(f);
fclose(f);
if (ret != EXIT_SUCCESS) {
unlink(ofname);
}
out:
return ret;
}
static int fix_header(void)
{
int buflen;
char *buf;
uint32_t crc, crc_orig;
struct u_media_header *hdr;
int ret = EXIT_FAILURE;
buflen = if_info.file_size;
if (buflen < sizeof(*hdr)) {
ERR("invalid input file\n");
return ret;
}
buf = malloc(buflen);
if (!buf) {
ERR("no memory for buffer\n");
goto out;
}
ret = read_to_buf(&if_info, buf);
if (ret)
goto out_free_buf;
hdr = (struct u_media_header *) buf;
if (ntohl(hdr->ih_magic) != IH_MAGIC) {
ERR("invalid input file, bad magic\n");
goto out_free_buf;
}
/* verify header CRC */
crc_orig = ntohl(hdr->ih_hcrc);
hdr->ih_hcrc = 0;
crc = cyg_ether_crc32((unsigned char *)hdr, sizeof(*hdr));
if (crc != crc_orig) {
ERR("invalid input file, bad header CRC\n");
goto out_free_buf;
}
hdr->ih_name[IH_NMLEN - UM_HEADER_LEN - 1] = '\0';
/* set U-Media specific fields */
hdr->ih_UMedia_magic = htonl(UM_MAGIC);
hdr->ih_UMedia_boardID = htonl(board_id);
hdr->ih_UMedia_imageType = image_type;
hdr->ih_UMedia_LoadDefault = (factory_defaults) ? 1 : 0;
/* update header CRC */
crc = cyg_ether_crc32((unsigned char *)hdr, sizeof(*hdr));
hdr->ih_hcrc = htonl(crc);
ret = write_fw(buf, buflen);
if (ret)
goto out_free_buf;
DBG("U-Media header fixed in \"%s\"", ofname);
ret = EXIT_SUCCESS;
out_free_buf:
free(buf);
out:
return ret;
}
int main(int argc, char *argv[])
{
int ret = EXIT_FAILURE;
progname = basename(argv[0]);
while (1) {
int c;
c = getopt(argc, argv, "B:Fi:o:T:h");
if (c == -1)
break;
switch (c) {
case 'B':
if (str2u32(optarg, &board_id)) {
ERR("%s is invalid '%s'",
"board ID", optarg);
goto out;
}
break;
case 'T':
if (str2u8(optarg, &image_type)) {
ERR("%s is invalid '%s'",
"image type", optarg);
goto out;
}
break;
case 'F':
factory_defaults = 1;
break;
case 'i':
if_info.file_name = optarg;
break;
case 'o':
ofname = optarg;
break;
case 'h':
usage(EXIT_SUCCESS);
break;
default:
usage(EXIT_FAILURE);
break;
}
}
ret = check_options();
if (ret)
goto out;
ret = fix_header();
out:
return ret;
}