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https://github.com/brain-hackers/u-boot-brain
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![Guilherme Maciel Ferreira](/assets/img/avatar_default.png)
The dumpimage is able to extract components contained in a FIT image: $ ./dumpimage -T flat_dt -i CONTAINER.ITB -p INDEX FILE The CONTAINER.ITB is a regular FIT container file. The INDEX is the poisition of the sub-image to be retrieved, and FILE is the file (path+name) to save the extracted sub-image. For example, given the following kernel.its to build a kernel.itb: /dts-v1/; / { ... images { kernel@1 { description = "Kernel 2.6.32-34"; data = /incbin/("/boot/vmlinuz-2.6.32-34-generic"); type = "kernel"; arch = "ppc"; os = "linux"; compression = "gzip"; load = <00000000>; entry = <00000000>; hash@1 { algo = "md5"; }; }; ... }; ... }; The dumpimage can extract the 'kernel@1' node through the following command: $ ./dumpimage -T flat_dt -i kernel.itb -p 0 kernel Extracted: Image 0 (kernel@1) Description: Kernel 2.6.32-34 Created: Wed Oct 22 15:50:26 2014 Type: Kernel Image Compression: gzip compressed Data Size: 4040128 Bytes = 3945.44 kB = 3.85 MB Architecture: PowerPC OS: Linux Load Address: 0x00000000 Entry Point: 0x00000000 Hash algo: md5 Hash value: 22352ad39bdc03e2e50f9cc28c1c3652 Which results in the file 'kernel' being exactly the same as '/boot/vmlinuz-2.6.32-34-generic'. Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>
270 lines
6.8 KiB
C
270 lines
6.8 KiB
C
/*
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* (C) Copyright 2008 Semihalf
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*
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* (C) Copyright 2000-2004
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* DENX Software Engineering
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* Wolfgang Denk, wd@denx.de
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*
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* Updated-by: Prafulla Wadaskar <prafulla@marvell.com>
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* FIT image specific code abstracted from mkimage.c
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* some functions added to address abstraction
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*
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include "imagetool.h"
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#include "fit_common.h"
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#include "mkimage.h"
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#include <image.h>
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#include <u-boot/crc.h>
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static image_header_t header;
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static int fit_add_file_data(struct image_tool_params *params, size_t size_inc,
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const char *tmpfile)
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{
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int tfd, destfd = 0;
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void *dest_blob = NULL;
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off_t destfd_size = 0;
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struct stat sbuf;
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void *ptr;
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int ret = 0;
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tfd = mmap_fdt(params->cmdname, tmpfile, size_inc, &ptr, &sbuf, true);
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if (tfd < 0)
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return -EIO;
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if (params->keydest) {
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struct stat dest_sbuf;
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destfd = mmap_fdt(params->cmdname, params->keydest, size_inc,
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&dest_blob, &dest_sbuf, false);
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if (destfd < 0) {
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ret = -EIO;
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goto err_keydest;
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}
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destfd_size = dest_sbuf.st_size;
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}
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/* for first image creation, add a timestamp at offset 0 i.e., root */
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if (params->datafile)
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ret = fit_set_timestamp(ptr, 0, sbuf.st_mtime);
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if (!ret) {
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ret = fit_add_verification_data(params->keydir, dest_blob, ptr,
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params->comment,
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params->require_keys);
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}
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if (dest_blob) {
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munmap(dest_blob, destfd_size);
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close(destfd);
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}
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err_keydest:
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munmap(ptr, sbuf.st_size);
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close(tfd);
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return ret;
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}
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/**
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* fit_handle_file - main FIT file processing function
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*
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* fit_handle_file() runs dtc to convert .its to .itb, includes
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* binary data, updates timestamp property and calculates hashes.
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*
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* datafile - .its file
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* imagefile - .itb file
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*
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* returns:
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* only on success, otherwise calls exit (EXIT_FAILURE);
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*/
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static int fit_handle_file(struct image_tool_params *params)
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{
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char tmpfile[MKIMAGE_MAX_TMPFILE_LEN];
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char cmd[MKIMAGE_MAX_DTC_CMDLINE_LEN];
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size_t size_inc;
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int ret;
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/* Flattened Image Tree (FIT) format handling */
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debug ("FIT format handling\n");
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/* call dtc to include binary properties into the tmp file */
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if (strlen (params->imagefile) +
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strlen (MKIMAGE_TMPFILE_SUFFIX) + 1 > sizeof (tmpfile)) {
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fprintf (stderr, "%s: Image file name (%s) too long, "
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"can't create tmpfile",
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params->imagefile, params->cmdname);
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return (EXIT_FAILURE);
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}
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sprintf (tmpfile, "%s%s", params->imagefile, MKIMAGE_TMPFILE_SUFFIX);
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/* We either compile the source file, or use the existing FIT image */
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if (params->datafile) {
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/* dtc -I dts -O dtb -p 500 datafile > tmpfile */
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snprintf(cmd, sizeof(cmd), "%s %s %s > %s",
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MKIMAGE_DTC, params->dtc, params->datafile, tmpfile);
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debug("Trying to execute \"%s\"\n", cmd);
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} else {
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snprintf(cmd, sizeof(cmd), "cp %s %s",
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params->imagefile, tmpfile);
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}
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if (system (cmd) == -1) {
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fprintf (stderr, "%s: system(%s) failed: %s\n",
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params->cmdname, cmd, strerror(errno));
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goto err_system;
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}
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/*
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* Set hashes for images in the blob. Unfortunately we may need more
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* space in either FDT, so keep trying until we succeed.
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*
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* Note: this is pretty inefficient for signing, since we must
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* calculate the signature every time. It would be better to calculate
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* all the data and then store it in a separate step. However, this
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* would be considerably more complex to implement. Generally a few
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* steps of this loop is enough to sign with several keys.
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*/
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for (size_inc = 0; size_inc < 64 * 1024; size_inc += 1024) {
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ret = fit_add_file_data(params, size_inc, tmpfile);
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if (!ret || ret != -ENOSPC)
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break;
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}
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if (ret) {
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fprintf(stderr, "%s Can't add hashes to FIT blob\n",
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params->cmdname);
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goto err_system;
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}
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if (rename (tmpfile, params->imagefile) == -1) {
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fprintf (stderr, "%s: Can't rename %s to %s: %s\n",
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params->cmdname, tmpfile, params->imagefile,
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strerror (errno));
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unlink (tmpfile);
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unlink (params->imagefile);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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err_system:
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unlink(tmpfile);
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return -1;
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}
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/**
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* fit_image_extract - extract a FIT component image
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* @fit: pointer to the FIT format image header
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* @image_noffset: offset of the component image node
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* @file_name: name of the file to store the FIT sub-image
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*
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* returns:
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* zero in case of success or a negative value if fail.
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*/
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static int fit_image_extract(
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const void *fit,
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int image_noffset,
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const char *file_name)
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{
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const void *file_data;
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size_t file_size = 0;
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/* get the "data" property of component at offset "image_noffset" */
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fit_image_get_data(fit, image_noffset, &file_data, &file_size);
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/* save the "file_data" into the file specified by "file_name" */
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return imagetool_save_subimage(file_name, (ulong) file_data, file_size);
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}
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/**
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* fit_extract_contents - retrieve a sub-image component from the FIT image
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* @ptr: pointer to the FIT format image header
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* @params: command line parameters
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*
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* returns:
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* zero in case of success or a negative value if fail.
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*/
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static int fit_extract_contents(void *ptr, struct image_tool_params *params)
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{
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int images_noffset;
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int noffset;
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int ndepth;
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const void *fit = ptr;
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int count = 0;
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const char *p;
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/* Indent string is defined in header image.h */
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p = IMAGE_INDENT_STRING;
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if (!fit_check_format(fit)) {
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printf("Bad FIT image format\n");
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return -1;
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}
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/* Find images parent node offset */
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images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
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if (images_noffset < 0) {
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printf("Can't find images parent node '%s' (%s)\n",
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FIT_IMAGES_PATH, fdt_strerror(images_noffset));
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return -1;
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}
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/* Avoid any overrun */
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count = fit_get_subimage_count(fit, images_noffset);
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if ((params->pflag < 0) || (count <= params->pflag)) {
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printf("No such component at '%d'\n", params->pflag);
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return -1;
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}
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/* Process its subnodes, extract the desired component from image */
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for (ndepth = 0, count = 0,
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noffset = fdt_next_node(fit, images_noffset, &ndepth);
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(noffset >= 0) && (ndepth > 0);
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noffset = fdt_next_node(fit, noffset, &ndepth)) {
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if (ndepth == 1) {
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/*
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* Direct child node of the images parent node,
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* i.e. component image node.
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*/
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if (params->pflag == count) {
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printf("Extracted:\n%s Image %u (%s)\n", p,
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count, fit_get_name(fit, noffset, NULL));
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fit_image_print(fit, noffset, p);
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return fit_image_extract(fit, noffset,
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params->outfile);
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}
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count++;
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}
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}
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return 0;
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}
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static int fit_check_params(struct image_tool_params *params)
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{
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return ((params->dflag && (params->fflag || params->lflag)) ||
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(params->fflag && (params->dflag || params->lflag)) ||
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(params->lflag && (params->dflag || params->fflag)));
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}
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U_BOOT_IMAGE_TYPE(
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fitimage,
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"FIT Image support",
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sizeof(image_header_t),
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(void *)&header,
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fit_check_params,
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fit_verify_header,
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fit_print_contents,
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NULL,
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fit_extract_contents,
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fit_check_image_types,
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fit_handle_file,
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NULL /* FIT images use DTB header */
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);
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