package/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 <string.h>
  30 #include <errno.h>
  31
  32 #include <sys/ioctl.h>
  33 #include <mtd/mtd-user.h>
  34 #include "mtd.h"
  35 #include "crc32.h"
  36
  37 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  38 struct trx_header {
  39         uint32_t magic;         /* "HDR0" */
  40         uint32_t len;           /* Length of file including header */
  41         uint32_t crc32;         /* 32-bit CRC from flag_version to end of file */
  42         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  43         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  44 };
  45
  46 #if __BYTE_ORDER == __BIG_ENDIAN
  47 #define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
  48 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  49 #define STORE32_LE(X)           (X)
  50 #else
  51 #error unknown endianness!
  52 #endif
  53
  54 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
  55 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
  56
  57 int
  58 trx_fixup(int fd, const char *name)
  59 {
  60         struct mtd_info_user mtdInfo;
  61         unsigned long len;
  62         struct trx_header *trx;
  63         void *ptr, *scan;
  64         int bfd;
  65
  66         if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
  67                 fprintf(stderr, "Failed to get mtd info\n");
  68                 goto err;
  69         }
  70
  71         len = mtdInfo.size;
  72         if (mtdInfo.size <= 0) {
  73                 fprintf(stderr, "Invalid MTD device size\n");
  74                 goto err;
  75         }
  76
  77         bfd = mtd_open(name, true);
  78         ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
  79         if (!ptr || (ptr == (void *) -1)) {
  80                 perror("mmap");
  81                 goto err1;
  82         }
  83
  84         trx = ptr;
  85         if (trx->magic != TRX_MAGIC) {
  86                 fprintf(stderr, "TRX header not found\n");
  87                 goto err;
  88         }
  89
  90         scan = ptr + offsetof(struct trx_header, flag_version);
  91         trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
  92         msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
  93         munmap(ptr, len);
  94         close(bfd);
  95         return 0;
  96
  97 err1:
  98         close(bfd);
  99 err:
 100         fprintf(stderr, "Error fixing up TRX header\n");
 101         return -1;
 102 }
 103
 104 int
 105 trx_check(int imagefd, const char *mtd, char *buf, int *len)
 106 {
 107         const struct trx_header *trx = (const struct trx_header *) buf;
 108         int fd;
 109
 110         if (strcmp(mtd, "linux") != 0)
 111                 return 1;
 112
 113         *len = read(imagefd, buf, 32);
 114         if (*len < 32) {
 115                 fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
 116                 return 0;
 117         }
 118
 119         if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
 120                 if (quiet < 2) {
 121                         fprintf(stderr, "Bad trx header\n");
 122                         fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
 123                                         "Please specify the correct file or use -f to force.\n");
 124                 }
 125                 return 0;
 126         }
 127
 128         /* check if image fits to mtd device */
 129         fd = mtd_check_open(mtd);
 130         if(fd < 0) {
 131                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 132                 exit(1);
 133         }
 134
 135         if(mtdsize < trx->len) {
 136                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 137                 close(fd);
 138                 return 0;
 139         }
 140
 141         close(fd);
 142         return 1;
 143 }
 144
 145 int
 146 mtd_fixtrx(const char *mtd, size_t offset)
 147 {
 148         int fd;
 149         struct trx_header *trx;
 150         char *buf;
 151         ssize_t res;
 152         size_t block_offset;
 153
 154         if (quiet < 2)
 155                 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
 156
 157         block_offset = offset & ~(erasesize - 1);
 158         offset -= block_offset;
 159
 160         fd = mtd_check_open(mtd);
 161         if(fd < 0) {
 162                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 163                 exit(1);
 164         }
 165
 166         if (block_offset + erasesize > mtdsize) {
 167                 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 168                 exit(1);
 169         }
 170
 171         buf = malloc(erasesize);
 172         if (!buf) {
 173                 perror("malloc");
 174                 exit(1);
 175         }
 176
 177         res = pread(fd, buf, erasesize, block_offset);
 178         if (res != erasesize) {
 179                 perror("pread");
 180                 exit(1);
 181         }
 182
 183         trx = (struct trx_header *) (buf + offset);
 184         if (trx->magic != STORE32_LE(0x30524448)) {
 185                 fprintf(stderr, "No trx magic found\n");
 186                 exit(1);
 187         }
 188
 189         if (trx->len == STORE32_LE(erasesize - offset)) {
 190                 if (quiet < 2)
 191                         fprintf(stderr, "Header already fixed, exiting\n");
 192                 close(fd);
 193                 return 0;
 194         }
 195
 196         trx->len = STORE32_LE(erasesize - offset);
 197
 198         trx->crc32 = STORE32_LE(crc32buf((char*) &trx->flag_version, erasesize - offset - 3*4));
 199         if (mtd_erase_block(fd, block_offset)) {
 200                 fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 201                 exit(1);
 202         }
 203
 204         if (quiet < 2)
 205                 fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 206
 207         if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
 208                 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
 209                 exit(1);
 210         }
 211
 212         if (quiet < 2)
 213                 fprintf(stderr, "Done.\n");
 214
 215         close (fd);
 216         sync();
 217         return 0;
 218
 219 }
 220