tools/dumpimage.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Based on mkimage.c.
   4  *
   5  * Written by Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>
   6  */
   7
   8 #include "dumpimage.h"
   9 #include <image.h>
  10 #include <version.h>
  11
  12 static void usage(void);
  13
  14 /* parameters initialized by core will be used by the image type code */
  15 static struct image_tool_params params = {
  16         .type = IH_TYPE_KERNEL,
  17 };
  18
  19 /*
  20  * dumpimage_extract_subimage -
  21  *
  22  * It scans all registered image types,
  23  * verifies image_header for each supported image type
  24  * if verification is successful, it extracts the desired file,
  25  * indexed by pflag, from the image
  26  *
  27  * returns negative if input image format does not match with any of
  28  * supported image types
  29  */
  30 static int dumpimage_extract_subimage(struct image_type_params *tparams,
  31                 void *ptr, struct stat *sbuf)
  32 {
  33         int retval = -1;
  34
  35         if (tparams->verify_header) {
  36                 retval = tparams->verify_header((unsigned char *)ptr,
  37                                 sbuf->st_size, &params);
  38                 if (retval != 0)
  39                         return -1;
  40                 /*
  41                  * Extract the file from the image
  42                  * if verify is successful
  43                  */
  44                 if (tparams->extract_subimage) {
  45                         retval = tparams->extract_subimage(ptr, &params);
  46                 } else {
  47                         fprintf(stderr,
  48                                 "%s: extract_subimage undefined for %s\n",
  49                                 params.cmdname, tparams->name);
  50                         return -2;
  51                 }
  52         }
  53
  54         return retval;
  55 }
  56
  57 int main(int argc, char **argv)
  58 {
  59         int opt;
  60         int ifd = -1;
  61         struct stat sbuf;
  62         char *ptr;
  63         int retval = 0;
  64         struct image_type_params *tparams = NULL;
  65
  66         params.cmdname = *argv;
  67
  68         while ((opt = getopt(argc, argv, "li:o:T:p:V")) != -1) {
  69                 switch (opt) {
  70                 case 'l':
  71                         params.lflag = 1;
  72                         break;
  73                 case 'i':
  74                         params.imagefile = optarg;
  75                         params.iflag = 1;
  76                         break;
  77                 case 'o':
  78                         params.outfile = optarg;
  79                         break;
  80                 case 'T':
  81                         params.type = genimg_get_type_id(optarg);
  82                         if (params.type < 0) {
  83                                 usage();
  84                         }
  85                         break;
  86                 case 'p':
  87                         params.pflag = strtoul(optarg, &ptr, 10);
  88                         if (*ptr) {
  89                                 fprintf(stderr,
  90                                         "%s: invalid file position %s\n",
  91                                         params.cmdname, *argv);
  92                                 exit(EXIT_FAILURE);
  93                         }
  94                         break;
  95                 case 'V':
  96                         printf("dumpimage version %s\n", PLAIN_VERSION);
  97                         exit(EXIT_SUCCESS);
  98                 default:
  99                         usage();
 100                         break;
 101                 }
 102         }
 103
 104         if (optind >= argc)
 105                 usage();
 106
 107         /* set tparams as per input type_id */
 108         tparams = imagetool_get_type(params.type);
 109         if (tparams == NULL) {
 110                 fprintf(stderr, "%s: unsupported type: %s\n",
 111                         params.cmdname, genimg_get_type_name(params.type));
 112                 exit(EXIT_FAILURE);
 113         }
 114
 115         /*
 116          * check the passed arguments parameters meets the requirements
 117          * as per image type to be generated/listed
 118          */
 119         if (tparams->check_params) {
 120                 if (tparams->check_params(&params))
 121                         usage();
 122         }
 123
 124         if (params.iflag)
 125                 params.datafile = argv[optind];
 126         else
 127                 params.imagefile = argv[optind];
 128         if (!params.outfile)
 129                 params.outfile = params.datafile;
 130
 131         ifd = open(params.imagefile, O_RDONLY|O_BINARY);
 132         if (ifd < 0) {
 133                 fprintf(stderr, "%s: Can't open \"%s\": %s\n",
 134                         params.cmdname, params.imagefile,
 135                         strerror(errno));
 136                 exit(EXIT_FAILURE);
 137         }
 138
 139         if (params.lflag || params.iflag) {
 140                 if (fstat(ifd, &sbuf) < 0) {
 141                         fprintf(stderr, "%s: Can't stat \"%s\": %s\n",
 142                                 params.cmdname, params.imagefile,
 143                                 strerror(errno));
 144                         exit(EXIT_FAILURE);
 145                 }
 146
 147                 if ((uint32_t)sbuf.st_size < tparams->header_size) {
 148                         fprintf(stderr,
 149                                 "%s: Bad size: \"%s\" is not valid image\n",
 150                                 params.cmdname, params.imagefile);
 151                         exit(EXIT_FAILURE);
 152                 }
 153
 154                 ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, ifd, 0);
 155                 if (ptr == MAP_FAILED) {
 156                         fprintf(stderr, "%s: Can't read \"%s\": %s\n",
 157                                 params.cmdname, params.imagefile,
 158                                 strerror(errno));
 159                         exit(EXIT_FAILURE);
 160                 }
 161
 162                 /*
 163                  * Both calls bellow scan through dumpimage registry for all
 164                  * supported image types and verify the input image file
 165                  * header for match
 166                  */
 167                 if (params.iflag) {
 168                         /*
 169                          * Extract the data files from within the matched
 170                          * image type. Returns the error code if not matched
 171                          */
 172                         retval = dumpimage_extract_subimage(tparams, ptr,
 173                                         &sbuf);
 174                 } else {
 175                         /*
 176                          * Print the image information for matched image type
 177                          * Returns the error code if not matched
 178                          */
 179                         retval = imagetool_verify_print_header(ptr, &sbuf,
 180                                         tparams, &params);
 181                 }
 182
 183                 (void)munmap((void *)ptr, sbuf.st_size);
 184                 (void)close(ifd);
 185
 186                 return retval;
 187         }
 188
 189         (void)close(ifd);
 190
 191         return EXIT_SUCCESS;
 192 }
 193
 194 static void usage(void)
 195 {
 196         fprintf(stderr, "Usage: %s -l image\n"
 197                 "          -l ==> list image header information\n",
 198                 params.cmdname);
 199         fprintf(stderr,
 200                 "       %s -i image -T type [-p position] [-o outfile] data_file\n"
 201                 "          -i ==> extract from the 'image' a specific 'data_file'\n"
 202                 "          -T ==> set image type to 'type'\n"
 203                 "          -p ==> 'position' (starting at 0) of the 'data_file' inside the 'image'\n",
 204                 params.cmdname);
 205         fprintf(stderr,
 206                 "       %s -V ==> print version information and exit\n",
 207                 params.cmdname);
 208
 209         exit(EXIT_FAILURE);
 210 }