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tools/dumpimage.c
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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); /* image_type_params linked list to maintain registered image types supports */ static struct image_type_params *dumpimage_tparams; /* parameters initialized by core will be used by the image type code */ static struct image_tool_params params = { .type = IH_TYPE_KERNEL, }; /** * dumpimage_register() - register respective image generation/list support * * the input struct image_type_params is checked and appended to the link * list, if the input structure is already registered, issue an error * * @tparams: Image type parameters */ static void dumpimage_register(struct image_type_params *tparams) { struct image_type_params **tp; if (!tparams) { fprintf(stderr, "%s: %s: Null input ", params.cmdname, __func__); exit(EXIT_FAILURE); } /* scan the linked list, check for registry and point the last one */ for (tp = &dumpimage_tparams; *tp != NULL; tp = &(*tp)->next) { if (!strcmp((*tp)->name, tparams->name)) { fprintf(stderr, "%s: %s already registered ", params.cmdname, tparams->name); return; } } /* add input struct entry at the end of link list */ *tp = tparams; /* mark input entry as last entry in the link list */ tparams->next = NULL; debug("Registered %s ", tparams->name); } /** * dumpimage_get_type() - find the image type params for a given image type * * Scan all registered image types and check the input type_id for each * supported image type * * @return respective image_type_params pointer. If the input type is not * supported by any of registered image types, returns NULL */ static struct image_type_params *dumpimage_get_type(int type) { struct image_type_params *curr; for (curr = dumpimage_tparams; curr != NULL; curr = curr->next) { if (curr->check_image_type) { if (!curr->check_image_type(type)) return curr; } } return NULL; } /* * dumpimage_verify_print_header() - verifies the image header * * Scan registered image types and verify the image_header for each * supported image type. If verification is successful, this prints * the respective header. * * @return 0 on success, negative if input image format does not match with * any of supported image types */ static int dumpimage_verify_print_header(void *ptr, struct stat *sbuf) { int retval = -1; struct image_type_params *curr; for (curr = dumpimage_tparams; curr != NULL; curr = curr->next) { if (curr->verify_header) { retval = curr->verify_header((unsigned char *)ptr, sbuf->st_size, ¶ms); if (retval != 0) continue; /* * Print the image information if verify is * successful */ if (curr->print_header) { curr->print_header(ptr); } else { fprintf(stderr, "%s: print_header undefined for %s ", params.cmdname, curr->name); } break; } } return retval; } /* * dumpimage_extract_datafile - * * 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_datafile(void *ptr, struct stat *sbuf) { int retval = -1; struct image_type_params *curr; for (curr = dumpimage_tparams; curr != NULL; curr = curr->next) { if (curr->verify_header) { retval = curr->verify_header((unsigned char *)ptr, sbuf->st_size, ¶ms); if (retval != 0) continue; /* * Extract the file from the image * if verify is successful */ if (curr->extract_datafile) { curr->extract_datafile(ptr, ¶ms); } else { fprintf(stderr, "%s: extract_datafile undefined for %s ", params.cmdname, curr->name); break; } } } 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; /* Init all image generation/list support */ register_image_tool(dumpimage_register); params.cmdname = *argv; while ((opt = getopt(argc, argv, "li:o: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 'p': params.pflag = strtoul(optarg, &ptr, 10); if (*ptr) { fprintf(stderr, "%s: invalid file position %s ", params.cmdname, *argv); exit(EXIT_FAILURE); } break; case 'V': printf("dumpimage version %s ", PLAIN_VERSION); exit(EXIT_SUCCESS); default: usage(); } } if (optind >= argc) usage(); /* set tparams as per input type_id */ tparams = dumpimage_get_type(params.type); if (tparams == NULL) { fprintf(stderr, "%s: unsupported type %s ", 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 ", 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 ", params.cmdname, params.imagefile, strerror(errno)); exit(EXIT_FAILURE); } if ((unsigned)sbuf.st_size < tparams->header_size) { fprintf(stderr, "%s: Bad size: \"%s\" is not valid image ", 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 ", 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_datafile(ptr, &sbuf); } else { /* * Print the image information for matched image type * Returns the error code if not matched */ retval = dumpimage_verify_print_header(ptr, &sbuf); } (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 " " -l ==> list image header information ", params.cmdname); fprintf(stderr, " %s -i image [-p position] [-o outfile] data_file " " -i ==> extract from the 'image' a specific 'data_file'" ", indexed by 'position' (starting at 0) ", params.cmdname); fprintf(stderr, " %s -V ==> print version information and exit ", params.cmdname); exit(EXIT_FAILURE); } |