tools/imls/imls.c

   1 /*
   2  * (C) Copyright 2009 Marco Stornelli
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <stddef.h>
  12 #include <string.h>
  13 #include <sys/types.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/stat.h>
  16 #include <unistd.h>
  17 #include <asm/page.h>
  18
  19 #ifdef MTD_OLD
  20 #include <stdint.h>
  21 #include <linux/mtd/mtd.h>
  22 #else
  23 #define  __user /* nothing */
  24 #include <mtd/mtd-user.h>
  25 #endif
  26
  27 #include <sha1.h>
  28 #include <libfdt.h>
  29 #include <fdt_support.h>
  30 #include <image.h>
  31
  32 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  33
  34 extern unsigned long crc32(unsigned long crc, const char *buf, unsigned int len);
  35 static void usage(void);
  36 static int image_verify_header(char *ptr, int fd);
  37 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start);
  38
  39 char    *cmdname;
  40 char    *devicefile;
  41
  42 unsigned int sectorcount = 0;
  43 int sflag = 0;
  44 unsigned int sectoroffset = 0;
  45 unsigned int sectorsize = 0;
  46 int cflag = 0;
  47
  48 int main (int argc, char **argv)
  49 {
  50         int fd = -1, err = 0, readbyte = 0, j;
  51         struct mtd_info_user mtdinfo;
  52         char buf[sizeof(image_header_t)];
  53         int found = 0;
  54
  55         cmdname = *argv;
  56
  57         while (--argc > 0 && **++argv == '-') {
  58                 while (*++*argv) {
  59                         switch (**argv) {
  60                         case 'c':
  61                                 if (--argc <= 0)
  62                                         usage ();
  63                                 sectorcount = (unsigned int)atoi(*++argv);
  64                                 cflag = 1;
  65                                 goto NXTARG;
  66                         case 'o':
  67                                 if (--argc <= 0)
  68                                         usage ();
  69                                 sectoroffset = (unsigned int)atoi(*++argv);
  70                                 goto NXTARG;
  71
  72                         case 's':
  73                                 if (--argc <= 0)
  74                                         usage ();
  75                                 sectorsize = (unsigned int)atoi(*++argv);
  76                                 sflag = 1;
  77                                 goto NXTARG;
  78                         default:
  79                                 usage ();
  80                         }
  81                 }
  82 NXTARG:         ;
  83         }
  84
  85         if (argc != 1 || cflag == 0 || sflag == 0)
  86                 usage();
  87
  88         devicefile = *argv;
  89
  90         fd = open(devicefile, O_RDONLY);
  91         if (fd < 0) {
  92                 fprintf (stderr, "%s: Can't open %s: %s\n",
  93                          cmdname, devicefile, strerror(errno));
  94                 exit(EXIT_FAILURE);
  95         }
  96
  97         err = ioctl(fd, MEMGETINFO, &mtdinfo);
  98         if (err < 0) {
  99                 fprintf(stderr, "%s: Cannot get MTD information: %s\n",cmdname,
 100                         strerror(errno));
 101                 exit(EXIT_FAILURE);
 102         }
 103
 104         if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) {
 105                 fprintf(stderr, "%s: Unsupported flash type %u\n",
 106                         cmdname, mtdinfo.type);
 107                 exit(EXIT_FAILURE);
 108         }
 109
 110         if (sectorsize * sectorcount != mtdinfo.size) {
 111                 fprintf(stderr, "%s: Partition size (%d) incompatible with "
 112                         "sector size and count\n", cmdname, mtdinfo.size);
 113                 exit(EXIT_FAILURE);
 114         }
 115
 116         if (sectorsize * sectoroffset >= mtdinfo.size) {
 117                 fprintf(stderr, "%s: Partition size (%d) incompatible with "
 118                         "sector offset given\n", cmdname, mtdinfo.size);
 119                 exit(EXIT_FAILURE);
 120         }
 121
 122         if (sectoroffset > sectorcount - 1) {
 123                 fprintf(stderr, "%s: Sector offset cannot be grater than "
 124                         "sector count minus one\n", cmdname);
 125                 exit(EXIT_FAILURE);
 126         }
 127
 128         printf("Searching....\n");
 129
 130         for (j = sectoroffset; j < sectorcount; ++j) {
 131
 132                 if (lseek(fd, j*sectorsize, SEEK_SET) != j*sectorsize) {
 133                         fprintf(stderr, "%s: lseek failure: %s\n",
 134                         cmdname, strerror(errno));
 135                         exit(EXIT_FAILURE);
 136                 }
 137
 138                 err = flash_bad_block(fd, mtdinfo.type, j*sectorsize);
 139                 if (err < 0)
 140                         exit(EXIT_FAILURE);
 141                 if (err)
 142                         continue; /* Skip and jump to next */
 143
 144                 readbyte = read(fd, buf, sizeof(image_header_t));
 145                 if (readbyte != sizeof(image_header_t)) {
 146                         fprintf(stderr, "%s: Can't read from device: %s\n",
 147                         cmdname, strerror(errno));
 148                         exit(EXIT_FAILURE);
 149                 }
 150
 151                 if (fdt_check_header(buf)) {
 152                         /* old-style image */
 153                         if (image_verify_header(buf, fd)) {
 154                                 found = 1;
 155                                 image_print_contents((image_header_t *)buf);
 156                         }
 157                 } else {
 158                         /* FIT image */
 159                         fit_print_contents(buf);
 160                 }
 161
 162         }
 163
 164         close(fd);
 165
 166         if(!found)
 167                 printf("No images found\n");
 168
 169         exit(EXIT_SUCCESS);
 170 }
 171
 172 void usage()
 173 {
 174         fprintf (stderr, "Usage:\n"
 175                          "       %s [-o offset] -s size -c count device\n"
 176                          "          -o ==> number of sectors to use as offset\n"
 177                          "          -c ==> number of sectors\n"
 178                          "          -s ==> size of sectors (byte)\n",
 179                 cmdname);
 180
 181         exit(EXIT_FAILURE);
 182 }
 183
 184 static int image_verify_header(char *ptr, int fd)
 185 {
 186         int len, nread;
 187         char *data;
 188         uint32_t checksum;
 189         image_header_t *hdr = (image_header_t *)ptr;
 190         char buf[PAGE_SIZE];
 191
 192         if (image_get_magic(hdr) != IH_MAGIC)
 193                 return 0;
 194
 195         data = (char *)hdr;
 196         len  = image_get_header_size();
 197
 198         checksum = image_get_hcrc(hdr);
 199         hdr->ih_hcrc = htonl(0);        /* clear for re-calculation */
 200
 201         if (crc32(0, data, len) != checksum) {
 202                 fprintf(stderr,
 203                       "%s: Maybe image found but it has bad header checksum!\n",
 204                       cmdname);
 205                 return 0;
 206         }
 207
 208         len = image_get_size(hdr);
 209         checksum = 0;
 210
 211         while (len > 0) {
 212                 nread = read(fd, buf, MIN(len,PAGE_SIZE));
 213                 if (nread != MIN(len,PAGE_SIZE)) {
 214                         fprintf(stderr,
 215                                 "%s: Error while reading: %s\n",
 216                                 cmdname, strerror(errno));
 217                         exit(EXIT_FAILURE);
 218                 }
 219                 checksum = crc32(checksum, buf, nread);
 220                 len -= nread;
 221         }
 222
 223         if (checksum != image_get_dcrc(hdr)) {
 224                 fprintf (stderr,
 225                         "%s: Maybe image found but it has corrupted data!\n",
 226                         cmdname);
 227                 return 0;
 228         }
 229
 230         return 1;
 231 }
 232
 233 /*
 234  * Test for bad block on NAND, just returns 0 on NOR, on NAND:
 235  * 0    - block is good
 236  * > 0  - block is bad
 237  * < 0  - failed to test
 238  */
 239 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start)
 240 {
 241         if (mtd_type == MTD_NANDFLASH) {
 242                 int badblock = ioctl(fd, MEMGETBADBLOCK, &start);
 243
 244                 if (badblock < 0) {
 245                         fprintf(stderr,"%s: Cannot read bad block mark: %s\n",
 246                                 cmdname, strerror(errno));
 247                         return badblock;
 248                 }
 249
 250                 if (badblock) {
 251                         return badblock;
 252                 }
 253         }
 254
 255         return 0;
 256 }