OpenWrt – Rev 1

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/*
 *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
 *  Copyright (C) 2016 FUKAUMI Naoki <naobsd@gmail.com>
 *
 *  Based on mkdniimg.c
 *
 *  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>

#define DNI_HDR_LEN     128

/*
 * Globals
 */
static char *ifname;
static char *progname;
static char *ofname;
static char *version = "0.00_0.00";
static char *region = "JP";
static char *rootfs_size;
static char *kernel_size;

static char *board_id;
/*
 * 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)

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>       create image for the board specified with <board>\n"
"  -i <file>        read input from the file <file>\n"
"  -o <file>        write output to the file <file>\n"
"  -v <version>     set image version to <version>\n"
"  -r <region>      set image region to <region>\n"
"  -R <rootfs_size> set RootfsSize to <rootfs_size>\n"
"  -K <kernel_size> set KernelSize to <kernel_size>\n"
"  -h               show this screen\n"
        );

        exit(status);
}

int main(int argc, char *argv[])
{
        int res = EXIT_FAILURE;
        int buflen;
        int err;
        struct stat st;
        char *buf;
        int i;
        uint8_t csum;

        FILE *outfile, *infile;

        progname = basename(argv[0]);

        while ( 1 ) {
                int c;

                c = getopt(argc, argv, "B:i:o:v:r:R:K:h");
                if (c == -1)
                        break;

                switch (c) {
                case 'B':
                        board_id = optarg;
                        break;
                case 'i':
                        ifname = optarg;
                        break;
                case 'o':
                        ofname = optarg;
                        break;
                case 'v':
                        version = optarg;
                        break;
                case 'r':
                        region = optarg;
                        break;
                case 'R':
                        rootfs_size = optarg;
                        break;
                case 'K':
                        kernel_size = optarg;
                        break;
                case 'h':
                        usage(EXIT_SUCCESS);
                        break;
                default:
                        usage(EXIT_FAILURE);
                        break;
                }
        }

        if (board_id == NULL) {
                ERR("no board specified");
                goto err;
        }

        if (rootfs_size == NULL) {
                ERR("no rootfs_size specified");
                goto err;
        }

        if (kernel_size == NULL) {
                ERR("no kernel_size specified");
                goto err;
        }

        if (ifname == NULL) {
                ERR("no input file specified");
                goto err;
        }

        if (ofname == NULL) {
                ERR("no output file specified");
                goto err;
        }

        err = stat(ifname, &st);
        if (err){
                ERRS("stat failed on %s", ifname);
                goto err;
        }

        buflen = st.st_size + DNI_HDR_LEN + 1;
        buf = malloc(buflen);
        if (!buf) {
                ERR("no memory for buffer\n");
                goto err;
        }

        memset(buf, 0, DNI_HDR_LEN);
        snprintf(buf, DNI_HDR_LEN, "device:%s\nversion:%s\nregion:%s\n"
                 "RootfsSize:%s\nKernelSize:%s\nInfoHeadSize:128\n",
                 board_id, version, region, rootfs_size, kernel_size);
        buf[DNI_HDR_LEN - 2] = 0x12;
        buf[DNI_HDR_LEN - 1] = 0x32;

        infile = fopen(ifname, "r");
        if (infile == NULL) {
                ERRS("could not open \"%s\" for reading", ifname);
                goto err_free;
        }

        errno = 0;
        fread(buf +  DNI_HDR_LEN, st.st_size, 1, infile);
        if (errno != 0) {
                ERRS("unable to read from file %s", ifname);
                goto err_close_in;
        }

        csum = 0;
        for (i = 0; i < (st.st_size + DNI_HDR_LEN); i++)
                csum += buf[i];

        csum = 0xff - csum;
        buf[st.st_size + DNI_HDR_LEN] = csum;

        outfile = fopen(ofname, "w");
        if (outfile == NULL) {
                ERRS("could not open \"%s\" for writing", ofname);
                goto err_close_in;
        }

        errno = 0;
        fwrite(buf, buflen, 1, outfile);
        if (errno) {
                ERRS("unable to write to file %s", ofname);
                goto err_close_out;
        }

        res = EXIT_SUCCESS;

        fflush(outfile);

 err_close_out:
        fclose(outfile);
        if (res != EXIT_SUCCESS) {
                unlink(ofname);
        }

 err_close_in:
        fclose(infile);

 err_free:
        free(buf);

 err:
        return res;
}