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/*
* Based on mkimage.c.
*
* Written by Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include "dumpimage.h"
#include <image.h>
#include <version.h>
static void usage(void);
/* parameters initialized by core will be used by the image type code */
static struct image_tool_params params = {
.type = IH_TYPE_KERNEL,
};
/*
* dumpimage_extract_subimage -
*
* It scans all registered image types,
* verifies image_header for each supported image type
* if verification is successful, it extracts the desired file,
* indexed by pflag, from the image
*
* returns negative if input image format does not match with any of
* supported image types
*/
static int dumpimage_extract_subimage(struct image_type_params *tparams,
void *ptr, struct stat *sbuf)
{
int retval = -1;
if (tparams->verify_header) {
retval = tparams->verify_header((unsigned char *)ptr,
sbuf->st_size, ¶ms);
if (retval != 0)
return -1;
/*
* Extract the file from the image
* if verify is successful
*/
if (tparams->extract_subimage) {
retval = tparams->extract_subimage(ptr, ¶ms);
} else {
fprintf(stderr,
"%s: extract_subimage undefined for %s\n",
params.cmdname, tparams->name);
return -2;
}
}
return retval;
}
int main(int argc, char **argv)
{
int opt;
int ifd = -1;
struct stat sbuf;
char *ptr;
int retval = 0;
struct image_type_params *tparams = NULL;
params.cmdname = *argv;
while ((opt = getopt(argc, argv, "li:o:T:p:V")) != -1) {
switch (opt) {
case 'l':
params.lflag = 1;
break;
case 'i':
params.imagefile = optarg;
params.iflag = 1;
break;
case 'o':
params.outfile = optarg;
break;
case 'T':
params.type = genimg_get_type_id(optarg);
if (params.type < 0) {
usage();
}
break;
case 'p':
params.pflag = strtoul(optarg, &ptr, 10);
if (*ptr) {
fprintf(stderr,
"%s: invalid file position %s\n",
params.cmdname, *argv);
exit(EXIT_FAILURE);
}
break;
case 'V':
printf("dumpimage version %s\n", PLAIN_VERSION);
exit(EXIT_SUCCESS);
default:
usage();
break;
}
}
if (optind >= argc)
usage();
/* set tparams as per input type_id */
tparams = imagetool_get_type(params.type);
if (tparams == NULL) {
fprintf(stderr, "%s: unsupported type: %s\n",
params.cmdname, genimg_get_type_name(params.type));
exit(EXIT_FAILURE);
}
/*
* check the passed arguments parameters meets the requirements
* as per image type to be generated/listed
*/
if (tparams->check_params) {
if (tparams->check_params(¶ms))
usage();
}
if (params.iflag)
params.datafile = argv[optind];
else
params.imagefile = argv[optind];
if (!params.outfile)
params.outfile = params.datafile;
ifd = open(params.imagefile, O_RDONLY|O_BINARY);
if (ifd < 0) {
fprintf(stderr, "%s: Can't open \"%s\": %s\n",
params.cmdname, params.imagefile,
strerror(errno));
exit(EXIT_FAILURE);
}
if (params.lflag || params.iflag) {
if (fstat(ifd, &sbuf) < 0) {
fprintf(stderr, "%s: Can't stat \"%s\": %s\n",
params.cmdname, params.imagefile,
strerror(errno));
exit(EXIT_FAILURE);
}
if ((uint32_t)sbuf.st_size < tparams->header_size) {
fprintf(stderr,
"%s: Bad size: \"%s\" is not valid image\n",
params.cmdname, params.imagefile);
exit(EXIT_FAILURE);
}
ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, ifd, 0);
if (ptr == MAP_FAILED) {
fprintf(stderr, "%s: Can't read \"%s\": %s\n",
params.cmdname, params.imagefile,
strerror(errno));
exit(EXIT_FAILURE);
}
/*
* Both calls bellow scan through dumpimage registry for all
* supported image types and verify the input image file
* header for match
*/
if (params.iflag) {
/*
* Extract the data files from within the matched
* image type. Returns the error code if not matched
*/
retval = dumpimage_extract_subimage(tparams, ptr,
&sbuf);
} else {
/*
* Print the image information for matched image type
* Returns the error code if not matched
*/
retval = imagetool_verify_print_header(ptr, &sbuf,
tparams, ¶ms);
}
(void)munmap((void *)ptr, sbuf.st_size);
(void)close(ifd);
return retval;
}
(void)close(ifd);
return EXIT_SUCCESS;
}
static void usage(void)
{
fprintf(stderr, "Usage: %s -l image\n"
" -l ==> list image header information\n",
params.cmdname);
fprintf(stderr,
" %s -i image -T type [-p position] [-o outfile] data_file\n"
" -i ==> extract from the 'image' a specific 'data_file'\n"
" -T ==> set image type to 'type'\n"
" -p ==> 'position' (starting at 0) of the 'data_file' inside the 'image'\n",
params.cmdname);
fprintf(stderr,
" %s -V ==> print version information and exit\n",
params.cmdname);
exit(EXIT_FAILURE);
}
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