OpenWrt – Rev 1
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/*
* Copyright (C) 2014 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 <arpa/inet.h>
#include <netinet/in.h>
#define MAX_MAGIC_LEN 16
#define MAX_MODEL_LEN 32
#define MAX_VERSION_LEN 14
#define MAX_MTD_NAME_LEN 16
#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
struct edimax_header {
char magic[MAX_MAGIC_LEN];
char model[MAX_MODEL_LEN];
unsigned char force;
unsigned char header_csum;
unsigned char data_csum;
uint32_t data_size;
uint32_t start_addr;
uint32_t end_addr;
char fw_version[MAX_VERSION_LEN];
unsigned char type;
char mtd_name[MAX_MTD_NAME_LEN];
} __attribute__ ((packed));
/*
* Globals
*/
static char *ofname;
static char *ifname;
static char *progname;
static char *model;
static char *magic = "eDiMaX";
static char *fw_version = "";
static char *mtd_name;
static int force;
static uint32_t start_addr;
static uint32_t end_addr;
static uint8_t image_type;
static int data_size;
/*
* 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"
" -e <addr> set end addr to <addr>\n"
" -f set force flag\n"
" -h show this screen\n"
" -i <file> read input data from the file <file>\n"
" -o <file> write output to the file <file>\n"
" -m <model> set model to <model>\n"
" -M <magic> set image magic to <magic>\n"
" -n <name> set MTD device name to <name>\n"
" -s <addr> set start address to <addr>\n"
" -t <type> set image type to <type>\n"
" -v <version> set firmware version to <version>\n"
);
exit(status);
}
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;
}
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) || (t >= 0x100)) {
return -1;
}
*val = t & 0xFF;
return 0;
}
static int get_file_size(char *name)
{
struct stat st;
int res;
res = stat(name, &st);
if (res){
ERRS("stat failed on %s", name);
return -1;
}
return st.st_size;
}
static int read_to_buf(char *name, char *buf, int buflen)
{
FILE *f;
int ret = EXIT_FAILURE;
f = fopen(name, "r");
if (f == NULL) {
ERRS("could not open \"%s\" for reading", name);
goto out;
}
errno = 0;
fread(buf, buflen, 1, f);
if (errno != 0) {
ERRS("unable to read from file \"%s\"", name);
goto out_close;
}
ret = EXIT_SUCCESS;
out_close:
fclose(f);
out:
return ret;
}
static int check_options(void)
{
#define CHKSTR(_name, _msg) \
do { \
if (_name == NULL) { \
ERR("no %s specified", _msg); \
return -1; \
} \
} while (0)
#define CHKSTRLEN(_name, _msg) \
do { \
int field_len; \
CHKSTR(_name, _msg); \
field_len = FIELD_SIZEOF(struct edimax_header, _name) - 1; \
if (strlen(_name) > field_len) { \
ERR("'%s' is too long, max %s length is %d", \
_name, _msg, field_len); \
return -1; \
} \
} while (0)
CHKSTR(ofname, "output file");
CHKSTR(ifname, "input file");
CHKSTRLEN(magic, "magic");
CHKSTRLEN(model, "model");
CHKSTRLEN(mtd_name, "MTD device name");
CHKSTRLEN(fw_version, "firware version");
data_size = get_file_size(ifname);
if (data_size < 0)
return -1;
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;
}
DBG("firmware file \"%s\" completed", ofname);
ret = EXIT_SUCCESS;
out_flush:
fflush(f);
fclose(f);
if (ret != EXIT_SUCCESS) {
unlink(ofname);
}
out:
return ret;
}
static unsigned char checksum(unsigned char *p, unsigned len)
{
unsigned char csum = 0;
while (len--)
csum += *p++;
csum ^= 0xb9;
return csum;
}
static int build_fw(void)
{
int buflen;
char *buf;
char *data;
struct edimax_header *hdr;
int ret = EXIT_FAILURE;
buflen = sizeof(struct edimax_header) + data_size;
buf = malloc(buflen);
if (!buf) {
ERR("no memory for buffer\n");
goto out;
}
data = buf + sizeof(struct edimax_header);
/* read input file */
ret = read_to_buf(ifname, data, data_size);
if (ret)
goto out_free_buf;
/* fill firmware header */
hdr = (struct edimax_header *)buf;
memset(hdr, 0, sizeof(struct edimax_header));
strncpy(hdr->model, model, sizeof(hdr->model));
strncpy(hdr->magic, magic, sizeof(hdr->magic));
strncpy(hdr->fw_version, fw_version, sizeof(hdr->fw_version));
strncpy(hdr->mtd_name, mtd_name, sizeof(hdr->mtd_name));
hdr->force = force;
hdr->start_addr = htonl(start_addr);
hdr->end_addr = htonl(end_addr);
hdr->data_size = htonl(data_size);
hdr->type = image_type;
hdr->data_csum = checksum((unsigned char *)data, data_size);
hdr->header_csum = checksum((unsigned char *)hdr,
sizeof(struct edimax_header));
ret = write_fw(buf, buflen);
if (ret)
goto out_free_buf;
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, "e:fhi:o:m:M:n:s:t:v:");
if (c == -1)
break;
switch (c) {
case 'e':
if (str2u32(optarg, &end_addr)) {
ERR("%s is invalid '%s'",
"end address", optarg);
goto out;
}
break;
case 'f':
force = 1;
break;
case 'i':
ifname = optarg;
break;
case 'h':
usage(EXIT_SUCCESS);
break;
case 'o':
ofname = optarg;
break;
case 'm':
model = optarg;
break;
case 'M':
magic = optarg;
break;
case 'n':
mtd_name = optarg;
break;
case 's':
if (str2u32(optarg, &start_addr)) {
ERR("%s is invalid '%s'",
"start address", optarg);
goto out;
}
break;
case 't':
if (str2u8(optarg, &image_type)) {
ERR("%s is invalid '%s'",
"image type", optarg);
goto out;
}
break;
case 'v':
fw_version = optarg;
break;
default:
usage(EXIT_FAILURE);
break;
}
}
ret = check_options();
if (ret)
goto out;
ret = build_fw();
out:
return ret;
}