package/system/mtd/src/trx.c

   1 /*
   2  * trx.c
   3  *
   4  * Copyright (C) 2005 Mike Baker
   5  * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
   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 #define min(x,y) ({             \
  50         typeof(x) _x = (x);     \
  51         typeof(y) _y = (y);     \
  52         (void) (&_x == &_y);    \
  53         _x < _y ? _x : _y; })
  54
  55 #if __BYTE_ORDER == __BIG_ENDIAN
  56 #define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
  57 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  58 #define STORE32_LE(X)           (X)
  59 #else
  60 #error unknown endianness!
  61 #endif
  62
  63 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
  64 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
  65
  66 int
  67 trx_fixup(int fd, const char *name)
  68 {
  69         struct mtd_info_user mtdInfo;
  70         unsigned long len;
  71         struct trx_header *trx;
  72         void *ptr, *scan;
  73         int bfd;
  74
  75         if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
  76                 fprintf(stderr, "Failed to get mtd info\n");
  77                 goto err;
  78         }
  79
  80         len = mtdInfo.size;
  81         if (mtdInfo.size <= 0) {
  82                 fprintf(stderr, "Invalid MTD device size\n");
  83                 goto err;
  84         }
  85
  86         bfd = mtd_open(name, true);
  87         ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
  88         if (!ptr || (ptr == (void *) -1)) {
  89                 perror("mmap");
  90                 fprintf(stderr, "Mapping the TRX header failed\n");
  91                 goto err1;
  92         }
  93
  94         trx = ptr;
  95         if (trx->magic != TRX_MAGIC) {
  96                 fprintf(stderr, "TRX header not found\n");
  97                 goto err;
  98         }
  99
 100         scan = ptr + offsetof(struct trx_header, flag_version);
 101         trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
 102         msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
 103         munmap(ptr, len);
 104         close(bfd);
 105         return 0;
 106
 107 err1:
 108         close(bfd);
 109 err:
 110         return -1;
 111 }
 112
 113 int
 114 trx_check(int imagefd, const char *mtd, char *buf, int *len)
 115 {
 116         const struct trx_header *trx = (const struct trx_header *) buf;
 117         int fd;
 118
 119         if (strcmp(mtd, "firmware") != 0)
 120                 return 1;
 121
 122         if (*len < 32) {
 123                 *len += read(imagefd, buf + *len, 32 - *len);
 124                 if (*len < 32) {
 125                         fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
 126                         return 0;
 127                 }
 128         }
 129
 130         if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
 131                 if (quiet < 2) {
 132                         fprintf(stderr, "Bad trx header\n");
 133                         fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
 134                                         "Please specify the correct file or use -f to force.\n");
 135                 }
 136                 return 0;
 137         }
 138
 139         /* check if image fits to mtd device */
 140         fd = mtd_check_open(mtd);
 141         if(fd < 0) {
 142                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 143                 exit(1);
 144         }
 145
 146         if(mtdsize < trx->len) {
 147                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 148                 close(fd);
 149                 return 0;
 150         }
 151
 152         close(fd);
 153         return 1;
 154 }
 155
 156 int
 157 mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
 158 {
 159         size_t data_offset;
 160         int fd;
 161         struct trx_header *trx;
 162         char *first_block;
 163         char *buf, *to;
 164         ssize_t res;
 165         size_t block_offset;
 166
 167         if (quiet < 2)
 168                 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
 169
 170         fd = mtd_check_open(mtd);
 171         if(fd < 0) {
 172                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 173                 exit(1);
 174         }
 175
 176         data_offset = offset + TRX_CRC32_DATA_OFFSET;
 177         if (data_size)
 178                 data_size += TRX_CRC32_DATA_SIZE;
 179         else
 180                 data_size = erasesize - TRX_CRC32_DATA_OFFSET;
 181
 182         block_offset = offset & ~(erasesize - 1);
 183         offset -= block_offset;
 184
 185         if (data_offset + data_size > mtdsize) {
 186                 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 187                 exit(1);
 188         }
 189
 190         first_block = malloc(erasesize);
 191         if (!first_block) {
 192                 perror("malloc");
 193                 exit(1);
 194         }
 195
 196         res = pread(fd, first_block, erasesize, block_offset);
 197         if (res != erasesize) {
 198                 perror("pread");
 199                 exit(1);
 200         }
 201
 202         trx = (struct trx_header *)(first_block + offset);
 203         if (trx->magic != STORE32_LE(0x30524448)) {
 204                 fprintf(stderr, "No trx magic found\n");
 205                 exit(1);
 206         }
 207
 208         buf = malloc(data_size);
 209         if (!buf) {
 210                 perror("malloc");
 211                 exit(1);
 212         }
 213
 214         to = buf;
 215         while (data_size) {
 216                 size_t read_block_offset = data_offset & ~(erasesize - 1);
 217                 size_t read_chunk;
 218
 219                 read_chunk = erasesize - (data_offset & (erasesize - 1));
 220                 read_chunk = min(read_chunk, data_size);
 221
 222                 /* Read from good blocks only to match CFE behavior */
 223                 if (!mtd_block_is_bad(fd, read_block_offset)) {
 224                         res = pread(fd, to, read_chunk, data_offset);
 225                         if (res != read_chunk) {
 226                                 perror("pread");
 227                                 exit(1);
 228                         }
 229                         to += read_chunk;
 230                 }
 231
 232                 data_offset += read_chunk;
 233                 data_size -= read_chunk;
 234         }
 235         data_size = to - buf;
 236
 237         if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET) &&
 238             trx->crc32 == STORE32_LE(crc32buf(buf, data_size))) {
 239                 if (quiet < 2)
 240                         fprintf(stderr, "Header already fixed, exiting\n");
 241                 close(fd);
 242                 return 0;
 243         }
 244
 245         trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
 246
 247         trx->crc32 = STORE32_LE(crc32buf(buf, data_size));
 248         if (mtd_erase_block(fd, block_offset)) {
 249                 fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 250                 exit(1);
 251         }
 252
 253         if (quiet < 2)
 254                 fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 255
 256         if (pwrite(fd, first_block, erasesize, block_offset) != erasesize) {
 257                 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
 258                 exit(1);
 259         }
 260
 261         if (quiet < 2)
 262                 fprintf(stderr, "Done.\n");
 263
 264         close (fd);
 265         sync();
 266         return 0;
 267
 268 }