package/system/mtd/src/trx.c

   1 /*
   2  * trx.c
   3  *
   4  * Copyright (C) 2005 Mike Baker
   5  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <sys/mman.h>
  28 #include <sys/stat.h>
  29 #include <endian.h>
  30 #include <string.h>
  31 #include <errno.h>
  32
  33 #include <sys/ioctl.h>
  34 #include <mtd/mtd-user.h>
  35 #include "mtd.h"
  36 #include "crc32.h"
  37
  38 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  39 #define TRX_CRC32_DATA_OFFSET   12      /* First 12 bytes are not covered by CRC32 */
  40 #define TRX_CRC32_DATA_SIZE     16
  41 struct trx_header {
  42         uint32_t magic;         /* "HDR0" */
  43         uint32_t len;           /* Length of file including header */
  44         uint32_t crc32;         /* 32-bit CRC from flag_version to end of file */
  45         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  46         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  47 };
  48
  49 #if __BYTE_ORDER == __BIG_ENDIAN
  50 #define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
  51 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  52 #define STORE32_LE(X)           (X)
  53 #else
  54 #error unknown endianness!
  55 #endif
  56
  57 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
  58 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
  59
  60 int
  61 trx_fixup(int fd, const char *name)
  62 {
  63         struct mtd_info_user mtdInfo;
  64         unsigned long len;
  65         struct trx_header *trx;
  66         void *ptr, *scan;
  67         int bfd;
  68
  69         if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
  70                 fprintf(stderr, "Failed to get mtd info\n");
  71                 goto err;
  72         }
  73
  74         len = mtdInfo.size;
  75         if (mtdInfo.size <= 0) {
  76                 fprintf(stderr, "Invalid MTD device size\n");
  77                 goto err;
  78         }
  79
  80         bfd = mtd_open(name, true);
  81         ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
  82         if (!ptr || (ptr == (void *) -1)) {
  83                 perror("mmap");
  84                 goto err1;
  85         }
  86
  87         trx = ptr;
  88         if (trx->magic != TRX_MAGIC) {
  89                 fprintf(stderr, "TRX header not found\n");
  90                 goto err;
  91         }
  92
  93         scan = ptr + offsetof(struct trx_header, flag_version);
  94         trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
  95         msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
  96         munmap(ptr, len);
  97         close(bfd);
  98         return 0;
  99
 100 err1:
 101         close(bfd);
 102 err:
 103         fprintf(stderr, "Error fixing up TRX header\n");
 104         return -1;
 105 }
 106
 107 #ifndef target_ar71xx
 108 int
 109 trx_check(int imagefd, const char *mtd, char *buf, int *len)
 110 {
 111         const struct trx_header *trx = (const struct trx_header *) buf;
 112         int fd;
 113
 114         if (strcmp(mtd, "firmware") != 0)
 115                 return 1;
 116
 117         if (*len < 32) {
 118                 *len += read(imagefd, buf + *len, 32 - *len);
 119                 if (*len < 32) {
 120                         fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
 121                         return 0;
 122                 }
 123         }
 124
 125         if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
 126                 if (quiet < 2) {
 127                         fprintf(stderr, "Bad trx header\n");
 128                         fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
 129                                         "Please specify the correct file or use -f to force.\n");
 130                 }
 131                 return 0;
 132         }
 133
 134         /* check if image fits to mtd device */
 135         fd = mtd_check_open(mtd);
 136         if(fd < 0) {
 137                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 138                 exit(1);
 139         }
 140
 141         if(mtdsize < trx->len) {
 142                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 143                 close(fd);
 144                 return 0;
 145         }
 146
 147         close(fd);
 148         return 1;
 149 }
 150 #endif
 151
 152 int
 153 mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
 154 {
 155         size_t data_offset;
 156         int fd;
 157         struct trx_header *trx;
 158         char *first_block;
 159         char *buf;
 160         ssize_t res;
 161         size_t block_offset;
 162
 163         if (quiet < 2)
 164                 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
 165
 166         fd = mtd_check_open(mtd);
 167         if(fd < 0) {
 168                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 169                 exit(1);
 170         }
 171
 172         data_offset = offset + TRX_CRC32_DATA_OFFSET;
 173         if (data_size)
 174                 data_size += TRX_CRC32_DATA_SIZE;
 175         else
 176                 data_size = erasesize - TRX_CRC32_DATA_OFFSET;
 177
 178         block_offset = offset & ~(erasesize - 1);
 179         offset -= block_offset;
 180
 181         if (data_offset + data_size > mtdsize) {
 182                 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 183                 exit(1);
 184         }
 185
 186         first_block = malloc(erasesize);
 187         if (!first_block) {
 188                 perror("malloc");
 189                 exit(1);
 190         }
 191
 192         res = pread(fd, first_block, erasesize, block_offset);
 193         if (res != erasesize) {
 194                 perror("pread");
 195                 exit(1);
 196         }
 197
 198         trx = (struct trx_header *)(first_block + offset);
 199         if (trx->magic != STORE32_LE(0x30524448)) {
 200                 fprintf(stderr, "No trx magic found\n");
 201                 exit(1);
 202         }
 203
 204         if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET)) {
 205                 if (quiet < 2)
 206                         fprintf(stderr, "Header already fixed, exiting\n");
 207                 close(fd);
 208                 return 0;
 209         }
 210
 211         buf = malloc(data_size);
 212         if (!buf) {
 213                 perror("malloc");
 214                 exit(1);
 215         }
 216
 217         res = pread(fd, buf, data_size, data_offset);
 218         if (res != data_size) {
 219                 perror("pread");
 220                 exit(1);
 221         }
 222
 223         trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
 224
 225         trx->crc32 = STORE32_LE(crc32buf(buf, data_size));
 226         if (mtd_erase_block(fd, block_offset)) {
 227                 fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 228                 exit(1);
 229         }
 230
 231         if (quiet < 2)
 232                 fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 233
 234         if (pwrite(fd, first_block, erasesize, block_offset) != erasesize) {
 235                 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
 236                 exit(1);
 237         }
 238
 239         if (quiet < 2)
 240                 fprintf(stderr, "Done.\n");
 241
 242         close (fd);
 243         sync();
 244         return 0;
 245
 246 }
 247