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 struct trx_header {
  40         uint32_t magic;         /* "HDR0" */
  41         uint32_t len;           /* Length of file including header */
  42         uint32_t crc32;         /* 32-bit CRC from flag_version to end of file */
  43         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  44         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  45 };
  46
  47 #if __BYTE_ORDER == __BIG_ENDIAN
  48 #define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
  49 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  50 #define STORE32_LE(X)           (X)
  51 #else
  52 #error unknown endianness!
  53 #endif
  54
  55 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
  56 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
  57
  58 int
  59 trx_fixup(int fd, const char *name)
  60 {
  61         struct mtd_info_user mtdInfo;
  62         unsigned long len;
  63         struct trx_header *trx;
  64         void *ptr, *scan;
  65         int bfd;
  66
  67         if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
  68                 fprintf(stderr, "Failed to get mtd info\n");
  69                 goto err;
  70         }
  71
  72         len = mtdInfo.size;
  73         if (mtdInfo.size <= 0) {
  74                 fprintf(stderr, "Invalid MTD device size\n");
  75                 goto err;
  76         }
  77
  78         bfd = mtd_open(name, true);
  79         ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
  80         if (!ptr || (ptr == (void *) -1)) {
  81                 perror("mmap");
  82                 goto err1;
  83         }
  84
  85         trx = ptr;
  86         if (trx->magic != TRX_MAGIC) {
  87                 fprintf(stderr, "TRX header not found\n");
  88                 goto err;
  89         }
  90
  91         scan = ptr + offsetof(struct trx_header, flag_version);
  92         trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
  93         msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
  94         munmap(ptr, len);
  95         close(bfd);
  96         return 0;
  97
  98 err1:
  99         close(bfd);
 100 err:
 101         fprintf(stderr, "Error fixing up TRX header\n");
 102         return -1;
 103 }
 104
 105 #ifndef target_ar71xx
 106 int
 107 trx_check(int imagefd, const char *mtd, char *buf, int *len)
 108 {
 109         const struct trx_header *trx = (const struct trx_header *) buf;
 110         int fd;
 111
 112         if (strcmp(mtd, "firmware") != 0)
 113                 return 1;
 114
 115         if (*len < 32) {
 116                 *len += read(imagefd, buf + *len, 32 - *len);
 117                 if (*len < 32) {
 118                         fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
 119                         return 0;
 120                 }
 121         }
 122
 123         if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
 124                 if (quiet < 2) {
 125                         fprintf(stderr, "Bad trx header\n");
 126                         fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
 127                                         "Please specify the correct file or use -f to force.\n");
 128                 }
 129                 return 0;
 130         }
 131
 132         /* check if image fits to mtd device */
 133         fd = mtd_check_open(mtd);
 134         if(fd < 0) {
 135                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 136                 exit(1);
 137         }
 138
 139         if(mtdsize < trx->len) {
 140                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 141                 close(fd);
 142                 return 0;
 143         }
 144
 145         close(fd);
 146         return 1;
 147 }
 148 #endif
 149
 150 int
 151 mtd_fixtrx(const char *mtd, size_t offset)
 152 {
 153         int fd;
 154         struct trx_header *trx;
 155         char *buf;
 156         ssize_t res;
 157         size_t block_offset;
 158
 159         if (quiet < 2)
 160                 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
 161
 162         fd = mtd_check_open(mtd);
 163         if(fd < 0) {
 164                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 165                 exit(1);
 166         }
 167
 168         block_offset = offset & ~(erasesize - 1);
 169         offset -= block_offset;
 170
 171         if (block_offset + erasesize > mtdsize) {
 172                 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 173                 exit(1);
 174         }
 175
 176         buf = malloc(erasesize);
 177         if (!buf) {
 178                 perror("malloc");
 179                 exit(1);
 180         }
 181
 182         res = pread(fd, buf, erasesize, block_offset);
 183         if (res != erasesize) {
 184                 perror("pread");
 185                 exit(1);
 186         }
 187
 188         trx = (struct trx_header *) (buf + offset);
 189         if (trx->magic != STORE32_LE(0x30524448)) {
 190                 fprintf(stderr, "No trx magic found\n");
 191                 exit(1);
 192         }
 193
 194         if (trx->len == STORE32_LE(erasesize - offset)) {
 195                 if (quiet < 2)
 196                         fprintf(stderr, "Header already fixed, exiting\n");
 197                 close(fd);
 198                 return 0;
 199         }
 200
 201         trx->len = STORE32_LE(erasesize - offset);
 202
 203         trx->crc32 = STORE32_LE(crc32buf((char*) &trx->flag_version, erasesize - offset - 3*4));
 204         if (mtd_erase_block(fd, block_offset)) {
 205                 fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 206                 exit(1);
 207         }
 208
 209         if (quiet < 2)
 210                 fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 211
 212         if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
 213                 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
 214                 exit(1);
 215         }
 216
 217         if (quiet < 2)
 218                 fprintf(stderr, "Done.\n");
 219
 220         close (fd);
 221         sync();
 222         return 0;
 223
 224 }
 225