434 lines
8.3 KiB
C
434 lines
8.3 KiB
C
/*
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* Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h> /* for unlink() */
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#include <libgen.h>
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#include <getopt.h> /* for getopt() */
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#include <stdarg.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#define MAX_MODEL_LEN 20
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#define MAX_SIGNATURE_LEN 30
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#define MAX_REGION_LEN 4
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#define MAX_VERSION_LEN 12
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#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
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struct file_info {
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char *file_name; /* name of the file */
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uint32_t file_size; /* length of the file */
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uint32_t write_size;
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};
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struct img_header {
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uint32_t checksum;
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uint32_t image_size;
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uint32_t kernel_size;
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char model[MAX_MODEL_LEN];
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char signature[MAX_SIGNATURE_LEN];
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char region[MAX_REGION_LEN];
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char version[MAX_VERSION_LEN];
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unsigned char header_len;
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unsigned char is_tgz;
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unsigned char pad[4];
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} __attribute__ ((packed));
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/*
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* Globals
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*/
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static char *ofname;
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static char *progname;
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static char *model;
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static char *signature;
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static char *region = "DEF";
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static char *version;
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static struct file_info kernel_info;
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static struct file_info rootfs_info;
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static uint32_t kernel_size;
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static uint32_t image_size;
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static int combined;
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/*
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* Message macros
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*/
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#define ERR(fmt, ...) do { \
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt "\n", \
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progname, ## __VA_ARGS__ ); \
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} while (0)
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#define ERRS(fmt, ...) do { \
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int save = errno; \
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt " (%s)\n", \
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progname, ## __VA_ARGS__, strerror(save)); \
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} while (0)
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#define DBG(fmt, ...) do { \
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fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
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} while (0)
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static void usage(int status)
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{
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FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
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fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
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fprintf(stream,
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"\n"
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"Options:\n"
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" -k <file> read kernel image from the file <file>\n"
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" -c use the kernel image as a combined image\n"
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" -M <model> set model to <model>\n"
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" -o <file> write output to the file <file>\n"
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" -r <file> read rootfs image from the file <file>\n"
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" -S <signature> set image signature to <signature>\n"
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" -R <region> set image region to <region>\n"
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" -V <version> set image version to <version>\n"
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" -I <size> set image size to <size>\n"
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" -K <size> set kernel size to <size>\n"
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" -h show this screen\n"
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);
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exit(status);
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}
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int
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str2u32(char *arg, uint32_t *val)
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{
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char *err = NULL;
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uint32_t t;
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errno=0;
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t = strtoul(arg, &err, 0);
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if (errno || (err==arg) || ((err != NULL) && *err)) {
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return -1;
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}
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*val = t;
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return 0;
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}
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static int get_file_stat(struct file_info *fdata)
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{
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struct stat st;
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int res;
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if (fdata->file_name == NULL)
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return 0;
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res = stat(fdata->file_name, &st);
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if (res){
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ERRS("stat failed on %s", fdata->file_name);
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return res;
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}
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fdata->file_size = st.st_size;
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fdata->write_size = fdata->file_size;
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return 0;
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}
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static int read_to_buf(struct file_info *fdata, char *buf)
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{
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FILE *f;
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int ret = EXIT_FAILURE;
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f = fopen(fdata->file_name, "r");
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if (f == NULL) {
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ERRS("could not open \"%s\" for reading", fdata->file_name);
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goto out;
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}
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errno = 0;
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fread(buf, fdata->file_size, 1, f);
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if (errno != 0) {
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ERRS("unable to read from file \"%s\"", fdata->file_name);
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goto out_close;
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}
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ret = EXIT_SUCCESS;
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out_close:
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fclose(f);
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out:
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return ret;
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}
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static int check_options(void)
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{
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int ret;
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#define CHKSTR(_name, _msg) \
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do { \
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if (_name == NULL) { \
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ERR("no %s specified", _msg); \
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return -1; \
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} \
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} while (0)
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#define CHKSTRLEN(_name, _msg) \
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do { \
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int field_len; \
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CHKSTR(_name, _msg); \
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field_len = FIELD_SIZEOF(struct img_header, _name) - 1; \
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if (strlen(_name) > field_len) { \
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ERR("%s is too long, max length is %d", \
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_msg, field_len); \
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return -1; \
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} \
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} while (0)
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CHKSTRLEN(model, "model");
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CHKSTRLEN(signature, "signature");
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CHKSTRLEN(region, "region");
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CHKSTRLEN(version, "version");
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CHKSTR(ofname, "output file");
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CHKSTR(kernel_info.file_name, "kernel image");
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ret = get_file_stat(&kernel_info);
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if (ret)
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return ret;
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if (combined) {
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if (!kernel_size) {
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ERR("kernel size must be specified for combined images");
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return -1; \
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}
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if (!image_size)
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image_size = kernel_info.file_size;
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if (kernel_info.file_size > image_size) {
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ERR("kernel image is too big");
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return -1;
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}
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kernel_info.write_size = image_size;
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} else {
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CHKSTR(rootfs_info.file_name, "rootfs image");
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ret = get_file_stat(&rootfs_info);
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if (ret)
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return ret;
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if (kernel_size) {
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/* override kernel size */
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kernel_info.write_size = kernel_size;
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}
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if (image_size) {
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if (image_size < kernel_info.write_size)
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kernel_info.write_size = image_size;
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/* override rootfs size */
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rootfs_info.write_size = image_size - kernel_info.write_size;
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}
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if (kernel_info.file_size > kernel_info.write_size) {
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ERR("kernel image is too big");
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return -1;
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}
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if (rootfs_info.file_size > rootfs_info.write_size) {
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ERR("rootfs image is too big");
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return -1;
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}
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}
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return 0;
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}
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static int write_fw(char *data, int len)
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{
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FILE *f;
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int ret = EXIT_FAILURE;
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f = fopen(ofname, "w");
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if (f == NULL) {
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ERRS("could not open \"%s\" for writing", ofname);
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goto out;
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}
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errno = 0;
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fwrite(data, len, 1, f);
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if (errno) {
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ERRS("unable to write output file");
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goto out_flush;
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}
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DBG("firmware file \"%s\" completed", ofname);
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ret = EXIT_SUCCESS;
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out_flush:
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fflush(f);
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fclose(f);
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if (ret != EXIT_SUCCESS) {
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unlink(ofname);
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}
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out:
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return ret;
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}
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static uint32_t get_csum(unsigned char *p, uint32_t len)
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{
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uint32_t csum = 0;
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while (len--)
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csum += *p++;
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return csum;
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}
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static int build_fw(void)
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{
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int buflen;
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char *buf;
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char *p;
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uint32_t csum;
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struct img_header *hdr;
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int ret = EXIT_FAILURE;
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buflen = sizeof(struct img_header) +
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kernel_info.write_size + rootfs_info.write_size;
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buf = malloc(buflen);
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if (!buf) {
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ERR("no memory for buffer\n");
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goto out;
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}
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memset(buf, 0, buflen);
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p = buf + sizeof(struct img_header);
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/* read kernel data */
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ret = read_to_buf(&kernel_info, p);
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if (ret)
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goto out_free_buf;
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if (!combined) {
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p += kernel_info.write_size;
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/* read rootfs data */
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ret = read_to_buf(&rootfs_info, p);
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if (ret)
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goto out_free_buf;
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}
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csum = get_csum((unsigned char *)(buf + sizeof(struct img_header)),
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buflen - sizeof(struct img_header));
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/* fill firmware header */
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hdr = (struct img_header *) buf;
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hdr->checksum = htonl(csum);
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hdr->image_size = htonl(buflen - sizeof(struct img_header));
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if (!combined)
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hdr->kernel_size = htonl(kernel_info.write_size);
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else
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hdr->kernel_size = htonl(kernel_size);
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hdr->header_len = sizeof(struct img_header);
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strncpy(hdr->model, model, sizeof(hdr->model));
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strncpy(hdr->signature, signature, sizeof(hdr->signature));
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strncpy(hdr->version, version, sizeof(hdr->version));
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strncpy(hdr->region, region, sizeof(hdr->region));
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ret = write_fw(buf, buflen);
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if (ret)
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goto out_free_buf;
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ret = EXIT_SUCCESS;
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out_free_buf:
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free(buf);
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out:
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return ret;
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}
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int main(int argc, char *argv[])
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{
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int ret = EXIT_FAILURE;
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progname = basename(argv[0]);
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while (1) {
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int c;
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c = getopt(argc, argv, "M:S:V:R:k:K:I:r:o:hc");
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if (c == -1)
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break;
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switch (c) {
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case 'M':
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model = optarg;
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break;
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case 'S':
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signature = optarg;
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break;
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case 'V':
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version = optarg;
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break;
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case 'R':
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region = optarg;
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break;
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case 'k':
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kernel_info.file_name = optarg;
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break;
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case 'K':
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if (str2u32(optarg, &kernel_size)) {
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ERR("%s is invalid '%s'",
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"kernel size", optarg);
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goto out;
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}
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break;
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case 'I':
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if (str2u32(optarg, &image_size)) {
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ERR("%s is invalid '%s'",
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"image size", optarg);
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goto out;
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}
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break;
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case 'r':
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rootfs_info.file_name = optarg;
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break;
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case 'c':
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combined = 1;
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break;
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case 'o':
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ofname = optarg;
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break;
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case 'h':
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usage(EXIT_SUCCESS);
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break;
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default:
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usage(EXIT_FAILURE);
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break;
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}
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}
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ret = check_options();
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if (ret)
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goto out;
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ret = build_fw();
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out:
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return ret;
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}
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