firmware-utils mkmerakifw: firmware generator for MR18
This patch adds firmware generation tool for Cisco's MR18 Signed-off-by: Thomas Hebb <tommyhebb@gmail.com> SVN-Revision: 47856
This commit is contained in:
John Crispin
parent
2f42d9e27d
commit
90e4b76bd1
|
|
@ -73,6 +73,7 @@ define Host/Compile
|
|||
$(call cc,mkrtn56uimg, -lz)
|
||||
$(call cc,dgn3500sum)
|
||||
$(call cc,edimax_fw_header, -Wall)
|
||||
$(call cc,mkmerakifw sha1, -Wall)
|
||||
endef
|
||||
|
||||
define Host/Install
|
||||
|
|
|
|||
|
|
@ -0,0 +1,263 @@
|
|||
/*
|
||||
* Copyright (C) 2015 Thomas Hebb <tommyhebb@gmail.com>
|
||||
*
|
||||
* The format of the header this tool generates was first documented by
|
||||
* Chris Blake <chrisrblake93 (at) gmail.com> in a shell script of the
|
||||
* same purpose. I have created this reimplementation at his request. The
|
||||
* original script can be found at:
|
||||
* <https://github.com/riptidewave93/meraki-partbuilder>
|
||||
*
|
||||
* 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 <stdbool.h>
|
||||
#include <string.h>
|
||||
#include <libgen.h>
|
||||
#include <getopt.h>
|
||||
#include <errno.h>
|
||||
#include <arpa/inet.h>
|
||||
|
||||
#include "sha1.h"
|
||||
|
||||
#define PADDING_BYTE 0xff
|
||||
|
||||
#define HDR_LENGTH 0x00000400
|
||||
#define HDR_OFF_MAGIC1 0
|
||||
#define HDR_OFF_HDRLEN 4
|
||||
#define HDR_OFF_IMAGELEN 8
|
||||
#define HDR_OFF_CHECKSUM 12
|
||||
#define HDR_OFF_MAGIC2 32
|
||||
#define HDR_OFF_FILLER 36
|
||||
#define HDR_OFF_STATICHASH 40
|
||||
|
||||
struct board_info {
|
||||
uint32_t magic;
|
||||
uint32_t imagelen;
|
||||
unsigned char statichash[20];
|
||||
char *id;
|
||||
char *description;
|
||||
};
|
||||
|
||||
/*
|
||||
* Globals
|
||||
*/
|
||||
static char *progname;
|
||||
|
||||
static char *board_id;
|
||||
static const struct board_info *board;
|
||||
|
||||
static const struct board_info boards[] = {
|
||||
{
|
||||
.id = "mr18",
|
||||
.description = "Meraki MR18 Access Point",
|
||||
.magic = 0x8e73ed8a,
|
||||
.imagelen = 0x00800000,
|
||||
.statichash = {0xda, 0x39, 0xa3, 0xee, 0x5e,
|
||||
0x6b, 0x4b, 0x0d, 0x32, 0x55,
|
||||
0xbf, 0xef, 0x95, 0x60, 0x18,
|
||||
0x90, 0xaf, 0xd8, 0x07, 0x09},
|
||||
}, {
|
||||
/* terminating entry */
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
* 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 "\n", \
|
||||
progname, ## __VA_ARGS__, strerror(save)); \
|
||||
} while (0)
|
||||
|
||||
static const struct board_info *find_board(const char *id)
|
||||
{
|
||||
const struct board_info *ret;
|
||||
const struct board_info *board;
|
||||
|
||||
ret = NULL;
|
||||
for (board = boards; board->id != NULL; board++) {
|
||||
if (strcasecmp(id, board->id) == 0) {
|
||||
ret = board;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void usage(int status)
|
||||
{
|
||||
FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
|
||||
const struct board_info *board;
|
||||
|
||||
fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
|
||||
fprintf(stream,
|
||||
"\n"
|
||||
"Options:\n"
|
||||
" -B <board> create image for the board specified with <board>\n"
|
||||
" -i <file> read kernel image from the file <file>\n"
|
||||
" -o <file> write output to the file <file>\n"
|
||||
" -s strip padding from the end of the image\n"
|
||||
" -h show this screen\n"
|
||||
);
|
||||
|
||||
fprintf(stream, "\nBoards:\n");
|
||||
for (board = boards; board->id != NULL; board++)
|
||||
fprintf(stream, " %-16s%s\n", board->id, board->description);
|
||||
|
||||
exit(status);
|
||||
}
|
||||
|
||||
void writel(unsigned char *buf, size_t offset, uint32_t value)
|
||||
{
|
||||
value = htonl(value);
|
||||
memcpy(buf + offset, &value, sizeof(uint32_t));
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
int ret = EXIT_FAILURE;
|
||||
long klen;
|
||||
size_t kspace;
|
||||
unsigned char *kernel;
|
||||
size_t buflen;
|
||||
unsigned char *buf;
|
||||
bool strip_padding = false;
|
||||
char *ofname = NULL, *ifname = NULL;
|
||||
FILE *out, *in;
|
||||
|
||||
progname = basename(argv[0]);
|
||||
|
||||
while (1) {
|
||||
int c;
|
||||
|
||||
c = getopt(argc, argv, "B:i:o:sh");
|
||||
if (c == -1)
|
||||
break;
|
||||
|
||||
switch (c) {
|
||||
case 'B':
|
||||
board_id = optarg;
|
||||
break;
|
||||
case 'i':
|
||||
ifname = optarg;
|
||||
break;
|
||||
case 'o':
|
||||
ofname = optarg;
|
||||
break;
|
||||
case 's':
|
||||
strip_padding = true;
|
||||
break;
|
||||
case 'h':
|
||||
usage(EXIT_SUCCESS);
|
||||
break;
|
||||
default:
|
||||
usage(EXIT_FAILURE);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (board_id == NULL) {
|
||||
ERR("no board specified");
|
||||
goto err;
|
||||
}
|
||||
|
||||
board = find_board(board_id);
|
||||
if (board == NULL) {
|
||||
ERR("unknown board \"%s\"", board_id);
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (ifname == NULL) {
|
||||
ERR("no input file specified");
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (ofname == NULL) {
|
||||
ERR("no output file specified");
|
||||
goto err;
|
||||
}
|
||||
|
||||
in = fopen(ifname, "r");
|
||||
if (in == NULL) {
|
||||
ERRS("could not open \"%s\" for reading: %s", ifname);
|
||||
goto err;
|
||||
}
|
||||
|
||||
buflen = board->imagelen;
|
||||
kspace = buflen - HDR_LENGTH;
|
||||
|
||||
/* Get kernel length */
|
||||
fseek(in, 0, SEEK_END);
|
||||
klen = ftell(in);
|
||||
rewind(in);
|
||||
|
||||
if (klen > kspace) {
|
||||
ERR("file \"%s\" is too big - max size: 0x%08lX\n",
|
||||
ifname, kspace);
|
||||
goto err_close_in;
|
||||
}
|
||||
|
||||
/* If requested, resize buffer to remove padding */
|
||||
if (strip_padding)
|
||||
buflen = klen + HDR_LENGTH;
|
||||
|
||||
/* Allocate and initialize buffer for final image */
|
||||
buf = malloc(buflen);
|
||||
if (buf == NULL) {
|
||||
ERRS("no memory for buffer: %s\n");
|
||||
goto err_close_in;
|
||||
}
|
||||
memset(buf, PADDING_BYTE, buflen);
|
||||
|
||||
/* Load kernel */
|
||||
kernel = buf + HDR_LENGTH;
|
||||
fread(kernel, klen, 1, in);
|
||||
|
||||
/* Write magic values and filler */
|
||||
writel(buf, HDR_OFF_MAGIC1, board->magic);
|
||||
writel(buf, HDR_OFF_MAGIC2, board->magic);
|
||||
writel(buf, HDR_OFF_FILLER, 0);
|
||||
|
||||
/* Write header and image length */
|
||||
writel(buf, HDR_OFF_HDRLEN, HDR_LENGTH);
|
||||
writel(buf, HDR_OFF_IMAGELEN, klen);
|
||||
|
||||
/* Write checksum and static hash */
|
||||
sha1_csum(kernel, klen, buf + HDR_OFF_CHECKSUM);
|
||||
memcpy(buf + HDR_OFF_STATICHASH, board->statichash, 20);
|
||||
|
||||
/* Save finished image */
|
||||
out = fopen(ofname, "w");
|
||||
if (out == NULL) {
|
||||
ERRS("could not open \"%s\" for writing: %s", ofname);
|
||||
goto err_free;
|
||||
}
|
||||
fwrite(buf, buflen, 1, out);
|
||||
|
||||
ret = EXIT_SUCCESS;
|
||||
|
||||
fclose(out);
|
||||
|
||||
err_free:
|
||||
free(buf);
|
||||
|
||||
err_close_in:
|
||||
fclose(in);
|
||||
|
||||
err:
|
||||
return ret;
|
||||
}
|
||||
Loading…
Reference in New Issue