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 #define SEAMA_MAGIC     0x17a4a35e
  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         *len = read(imagefd, buf, 32);
 118         if (*len < 32) {
 119                 fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
 120                 return 0;
 121         }
 122
 123         /* Allow writing Seama files to firmware without an extra validation */
 124         if (trx->magic == SEAMA_MAGIC)
 125                 return 1;
 126
 127         if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
 128                 if (quiet < 2) {
 129                         fprintf(stderr, "Bad trx header\n");
 130                         fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
 131                                         "Please specify the correct file or use -f to force.\n");
 132                 }
 133                 return 0;
 134         }
 135
 136         /* check if image fits to mtd device */
 137         fd = mtd_check_open(mtd);
 138         if(fd < 0) {
 139                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 140                 exit(1);
 141         }
 142
 143         if(mtdsize < trx->len) {
 144                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 145                 close(fd);
 146                 return 0;
 147         }
 148
 149         close(fd);
 150         return 1;
 151 }
 152 #endif
 153
 154 int
 155 mtd_fixtrx(const char *mtd, size_t offset)
 156 {
 157         int fd;
 158         struct trx_header *trx;
 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         block_offset = offset & ~(erasesize - 1);
 173         offset -= block_offset;
 174
 175         if (block_offset + erasesize > mtdsize) {
 176                 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 177                 exit(1);
 178         }
 179
 180         buf = malloc(erasesize);
 181         if (!buf) {
 182                 perror("malloc");
 183                 exit(1);
 184         }
 185
 186         res = pread(fd, buf, erasesize, block_offset);
 187         if (res != erasesize) {
 188                 perror("pread");
 189                 exit(1);
 190         }
 191
 192         trx = (struct trx_header *) (buf + offset);
 193         if (trx->magic != STORE32_LE(0x30524448)) {
 194                 fprintf(stderr, "No trx magic found\n");
 195                 exit(1);
 196         }
 197
 198         if (trx->len == STORE32_LE(erasesize - offset)) {
 199                 if (quiet < 2)
 200                         fprintf(stderr, "Header already fixed, exiting\n");
 201                 close(fd);
 202                 return 0;
 203         }
 204
 205         trx->len = STORE32_LE(erasesize - offset);
 206
 207         trx->crc32 = STORE32_LE(crc32buf((char*) &trx->flag_version, erasesize - offset - 3*4));
 208         if (mtd_erase_block(fd, block_offset)) {
 209                 fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 210                 exit(1);
 211         }
 212
 213         if (quiet < 2)
 214                 fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 215
 216         if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
 217                 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
 218                 exit(1);
 219         }
 220
 221         if (quiet < 2)
 222                 fprintf(stderr, "Done.\n");
 223
 224         close (fd);
 225         sync();
 226         return 0;
 227
 228 }
 229