mirror of https://github.com/hak5/openwrt-owl.git
firmware-utils: new tool for fixing U-Media firmware headers
Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 33848owl
Gabor Juhos
parent
d3c368c324
commit
86b788b1b4
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@ -61,6 +61,7 @@ define Host/Compile
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$(call cc,mkdapimg)
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$(call cc, mkcameofw, -Wall)
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$(call cc,seama md5)
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$(call cc,fix-u-media-header cyg_crc32,-Wall)
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endef
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define Host/Install
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@ -0,0 +1,354 @@
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/*
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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 "cyg_crc.h"
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#define IH_MAGIC 0x27051956 /* Image Magic Number */
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#define IH_NMLEN 32 /* Image Name Length */
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#define UM_MAGIC 0x55525F46
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#define UM_HEADER_LEN 12
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/*
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* all data in network byte order (aka natural aka bigendian)
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*/
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struct u_media_header {
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uint32_t ih_magic; /* Image Header Magic Number */
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uint32_t ih_hcrc; /* Image Header CRC Checksum */
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uint32_t ih_time; /* Image Creation Timestamp */
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uint32_t ih_size; /* Image Data Size */
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uint32_t ih_load; /* Data Load Address */
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uint32_t ih_ep; /* Entry Point Address */
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uint32_t ih_dcrc; /* Image Data CRC Checksum */
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uint8_t ih_os; /* Operating System */
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uint8_t ih_arch; /* CPU architecture */
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uint8_t ih_type; /* Image Type */
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uint8_t ih_comp; /* Compression Type */
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uint8_t ih_name[IH_NMLEN - UM_HEADER_LEN]; /* Image Name */
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uint32_t ih_UMedia_magic; /* U-Media magic number */
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uint32_t ih_UMedia_boardID; /* U-Media board ID */
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uint8_t ih_UMedia_imageType; /* U-Media image type */
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uint8_t ih_UMedia_LoadDefault; /* U-Media load to factory default setting */
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uint8_t ih_UMedia_temp1; /* U-Media didn't use this tag */
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uint8_t ih_UMedia_temp2; /* U-Media didn't use this tag */
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} __attribute__ ((packed));
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struct if_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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};
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static char *progname;
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static char *ofname;
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static struct if_info if_info;
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static int factory_defaults;
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static uint32_t board_id;
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static uint8_t image_type;
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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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" -B <board_id> set board ID to <board_id>\n"
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" -i <file> read input from the file <file>\n"
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" -F load factory defaults\n"
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" -o <file> write output to the file <file>\n"
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" -T <type> set image type to <type>\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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static int 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 str2u8(char *arg, uint8_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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if (t > 255)
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return -1;
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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 if_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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return 0;
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}
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static int read_to_buf(struct if_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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if (ofname == NULL) {
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ERR("no %s specified", "output file");
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return -1;
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}
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if (if_info.file_name == NULL) {
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ERR("no %s specified", "input file");
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return -1;
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}
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ret = get_file_stat(&if_info);
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if (ret)
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return ret;
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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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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 int fix_header(void)
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{
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int buflen;
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char *buf;
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uint32_t crc, crc_orig;
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struct u_media_header *hdr;
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int ret = EXIT_FAILURE;
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buflen = if_info.file_size;
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if (buflen < sizeof(*hdr)) {
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ERR("invalid input file\n");
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return ret;
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}
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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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ret = read_to_buf(&if_info, buf);
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if (ret)
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goto out_free_buf;
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hdr = (struct u_media_header *) buf;
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if (ntohl(hdr->ih_magic) != IH_MAGIC) {
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ERR("invalid input file, bad magic\n");
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goto out_free_buf;
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}
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/* verify header CRC */
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crc_orig = ntohl(hdr->ih_hcrc);
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hdr->ih_hcrc = 0;
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crc = cyg_ether_crc32((unsigned char *)hdr, sizeof(*hdr));
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if (crc != crc_orig) {
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ERR("invalid input file, bad header CRC\n");
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goto out_free_buf;
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}
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hdr->ih_name[IH_NMLEN - UM_HEADER_LEN - 1] = '\0';
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/* set U-Media specific fields */
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hdr->ih_UMedia_magic = htonl(UM_MAGIC);
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hdr->ih_UMedia_boardID = htonl(board_id);
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hdr->ih_UMedia_imageType = image_type;
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hdr->ih_UMedia_LoadDefault = (factory_defaults) ? 1 : 0;
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/* update header CRC */
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crc = cyg_ether_crc32((unsigned char *)hdr, sizeof(*hdr));
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hdr->ih_hcrc = htonl(crc);
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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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DBG("U-Media header fixed in \"%s\"", ofname);
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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, "B:Fi:o:T:h");
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if (c == -1)
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break;
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switch (c) {
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case 'B':
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if (str2u32(optarg, &board_id)) {
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ERR("%s is invalid '%s'",
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"board ID", optarg);
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goto out;
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}
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break;
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case 'T':
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if (str2u8(optarg, &image_type)) {
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ERR("%s is invalid '%s'",
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"image type", optarg);
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goto out;
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}
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break;
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case 'F':
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factory_defaults = 1;
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break;
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case 'i':
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if_info.file_name = optarg;
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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 = fix_header();
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out:
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return ret;
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}
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