341 lines
8.5 KiB
C
341 lines
8.5 KiB
C
/*
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* Make CHK Image
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*
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* This utility creates Netgear .chk files.
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*
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* Copyright (C) 2008 Dave C. Reeve <Dave.Reeve@dreeve.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#define BUF_LEN (2048)
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#define MAX_BOARD_ID_LEN (64)
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/*
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* Note on the reserved field of the chk_header:
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* OFW naming scheme is typically: DEVICENAME-VA.B.C.D_E.F.G.chk, with A-G
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* between 0 and 255. For instance: EX3700_EX3800-V1.0.0.58_1.0.38.chk
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* The reserved field works like this:
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* reserved[0]: region code. 1 for WW (WorldWide) and 2 for NA (North America)
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* reserved[1]: A
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* reserved[2]: B
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* reserved[3]: C
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* reserved[4]: D
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* reserved[5]: E
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* reserved[6]: F
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* reserved[7]: G
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*/
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struct chk_header {
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uint32_t magic;
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uint32_t header_len;
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uint8_t reserved[8];
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uint32_t kernel_chksum;
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uint32_t rootfs_chksum;
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uint32_t kernel_len;
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uint32_t rootfs_len;
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uint32_t image_chksum;
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uint32_t header_chksum;
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/* char board_id[] - upto MAX_BOARD_ID_LEN */
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};
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static void __attribute__ ((format (printf, 2, 3)))
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fatal_error (int maybe_errno, const char * format, ...)
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{
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va_list ap;
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fprintf (stderr, "mkchkimg: ");
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va_start (ap, format);
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vfprintf (stderr, format, ap);
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va_end (ap);
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if (maybe_errno) {
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fprintf (stderr, ": %s\n", strerror (maybe_errno));
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} else {
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fprintf (stderr, "\n");
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}
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exit (EXIT_FAILURE);
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}
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static void __attribute__ ((format (printf, 1, 2)))
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message (const char * format, ...)
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{
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va_list ap;
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fprintf (stderr, "mkchkimg: ");
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va_start (ap, format);
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vfprintf (stderr, format, ap);
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va_end (ap);
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fprintf (stderr, "\n");
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}
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struct ngr_checksum {
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uint32_t c0;
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uint32_t c1;
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};
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static inline void
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netgear_checksum_init (struct ngr_checksum * c)
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{
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c->c0 = c->c1 = 0;
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}
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static inline void
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netgear_checksum_add (struct ngr_checksum * c, unsigned char * buf, size_t len)
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{
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size_t i;
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for (i=0; i<len; i++) {
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c->c0 += buf[i] & 0xff;
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c->c1 += c->c0;
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}
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}
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static inline unsigned long
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netgear_checksum_fini (struct ngr_checksum * c)
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{
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uint32_t b, checksum;
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b = (c->c0 & 65535) + ((c->c0 >> 16) & 65535);
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c->c0 = ((b >> 16) + b) & 65535;
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b = (c->c1 & 65535) + ((c->c1 >> 16) & 65535);
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c->c1 = ((b >> 16) + b) & 65535;
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checksum = ((c->c1 << 16) | c->c0);
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return checksum;
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}
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static void
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print_help (void)
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{
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fprintf (stderr, "Usage: mkchkimg -o output -k kernel [-f filesys] [-b board_id] [-r region]\n");
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}
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int
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main (int argc, char * argv[])
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{
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int opt;
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char * ptr;
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size_t len;
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size_t header_len;
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struct chk_header * hdr;
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struct ngr_checksum chk_part, chk_whole;
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char buf[BUF_LEN];
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char * output_file, * kern_file, * fs_file;
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FILE * out_fp, * kern_fp, * fs_fp;
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char * board_id;
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unsigned long region;
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/* Default values */
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board_id = "U12H072T00_NETGEAR";
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region = 1; /* 1=WW, 2=NA */
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output_file = NULL;
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kern_file = NULL;
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fs_file = NULL;
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fs_fp = NULL;
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while ((opt = getopt (argc, argv, ":b:r:k:f:o:h")) != -1) {
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switch (opt) {
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case 'b':
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/* Board Identity */
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if (strlen (optarg) > MAX_BOARD_ID_LEN) {
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fatal_error (0, "Board lenght exceeds %d",
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MAX_BOARD_ID_LEN);
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}
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board_id = optarg;
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break;
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case 'r':
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/* Region */
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errno = 0;
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region = strtoul (optarg, &ptr, 0);
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if (errno || ptr==optarg || *ptr!='\0') {
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fatal_error (0, "Cannot parse region %s", optarg);
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}
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if (region > 0xff) {
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fatal_error (0, "Region cannot exceed 0xff");
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}
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break;
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case 'k':
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/* Kernel */
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kern_file = optarg;
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break;
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case 'f':
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/* Filing System */
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fs_file = optarg;
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break;
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case 'o':
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/* Output file */
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output_file = optarg;
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break;
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case 'h':
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print_help ();
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return EXIT_SUCCESS;
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case ':':
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print_help ();
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fatal_error (0, "Option -%c missing argument", optopt);
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break;
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case '?':
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print_help ();
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fatal_error (0, "Unknown argument -%c", optopt);
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break;
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default:
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break;
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}
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}
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/* Check we have all the options expected */
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if (!kern_file) {
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print_help ();
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fatal_error (0, "Kernel file expected");
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}
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if (!output_file) {
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print_help ();
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fatal_error (0, "Output file required");
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}
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message ("Netgear CHK writer - v0.1");
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/* Open the input file */
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kern_fp = fopen (kern_file, "r");
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if (!kern_fp) {
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fatal_error (errno, "Cannot open %s", kern_file);
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}
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/* Open the fs file, if specified */
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if (fs_file) {
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fs_fp = fopen (fs_file, "r");
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if (!fs_fp) {
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fatal_error (errno, "Cannot open %s", fs_file);
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}
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}
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/* Open the output file */
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out_fp = fopen (output_file, "w+");
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if (!out_fp) {
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fatal_error (errno, "Cannot open %s", output_file);
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}
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/* Write zeros when the chk header will be */
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buf[0] = '\0';
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header_len = sizeof (struct chk_header) + strlen (board_id);
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if (fwrite (buf, 1, header_len, out_fp) != header_len) {
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fatal_error (errno, "Cannot write header");
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}
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/* Allocate storage for header, we fill in as we go */
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hdr = malloc (sizeof (struct chk_header));
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if (!hdr) {
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fatal_error (0, "malloc failed");
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}
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bzero (hdr, sizeof (struct chk_header));
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/* Fill in known values */
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hdr->magic = htonl (0x2a23245e);
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hdr->header_len = htonl(header_len);
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hdr->reserved[0] = (unsigned char)(region & 0xff);
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hdr->reserved[1] = 1; /* Major */
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hdr->reserved[2] = 1; /* Minor */
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hdr->reserved[3] = 99; /* Build */
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hdr->reserved[4] = 0;
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hdr->reserved[5] = 0;
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hdr->reserved[6] = 0;
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hdr->reserved[7] = 0;
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message (" Board Id: %s", board_id);
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message (" Region: %s", region == 1 ? "World Wide (WW)"
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: (region == 2 ? "North America (NA)" : "Unknown"));
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/* Copy the trx file, calculating the checksum as we go */
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netgear_checksum_init (&chk_part);
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netgear_checksum_init (&chk_whole);
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while (!feof (kern_fp)) {
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len = fread (buf, 1, BUF_LEN, kern_fp);
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if (len < 1) {
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break;
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}
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if (fwrite (buf, len, 1, out_fp) != 1) {
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fatal_error (errno, "Write error");
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}
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hdr->kernel_len += len;
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netgear_checksum_add (&chk_part, (unsigned char *)buf, len);
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netgear_checksum_add (&chk_whole, (unsigned char *)buf, len);
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}
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hdr->kernel_chksum = netgear_checksum_fini (&chk_part);
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message (" Kernel Len: %u", hdr->kernel_len);
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message ("Kernel Checksum: 0x%08x", hdr->kernel_chksum);
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hdr->kernel_len = htonl (hdr->kernel_len);
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hdr->kernel_chksum = htonl (hdr->kernel_chksum);
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/* Now copy the root fs, calculating the checksum as we go */
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if (fs_fp) {
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netgear_checksum_init (&chk_part);
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while (!feof (fs_fp)) {
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len = fread (buf, 1, BUF_LEN, fs_fp);
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if (len < 1) {
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break;
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}
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if (fwrite (buf, len, 1, out_fp) != 1) {
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fatal_error (errno, "Write error");
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}
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hdr->rootfs_len += len;
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netgear_checksum_add (&chk_part, (unsigned char *)buf, len);
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netgear_checksum_add (&chk_whole, (unsigned char *)buf, len);
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}
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hdr->rootfs_chksum = (netgear_checksum_fini (&chk_part));
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message (" Rootfs Len: %u", hdr->rootfs_len);
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message ("Rootfs Checksum: 0x%08x", hdr->rootfs_chksum);
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hdr->rootfs_len = htonl (hdr->rootfs_len);
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hdr->rootfs_chksum = htonl (hdr->rootfs_chksum);
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}
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/* Calcautate the image checksum */
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hdr->image_chksum = netgear_checksum_fini (&chk_whole);
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message (" Image Checksum: 0x%08x", hdr->image_chksum);
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hdr->image_chksum = htonl (hdr->image_chksum);
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/* Calculate the header checksum */
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netgear_checksum_init (&chk_part);
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netgear_checksum_add (&chk_part, (unsigned char *)hdr,
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sizeof (struct chk_header));
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netgear_checksum_add (&chk_part, (unsigned char *)board_id,
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strlen (board_id));
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hdr->header_chksum = htonl (netgear_checksum_fini (&chk_part));
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/* Finally rewind the output and write headers */
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rewind (out_fp);
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if (fwrite (hdr, sizeof (struct chk_header), 1, out_fp) != 1) {
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fatal_error (errno, "Cannot write header");
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}
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if (fwrite (board_id, strlen (board_id), 1, out_fp) != 1) {
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fatal_error (errno, "Cannot write board id");
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}
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/* Success */
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return EXIT_SUCCESS;
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}
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