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 #ifndef target_ar71xx
 114 int
 115 trx_check(int imagefd, const char *mtd, char *buf, int *len)
 116 {
 117         const struct trx_header *trx = (const struct trx_header *) buf;
 118         int fd;
 119
 120         if (strcmp(mtd, "firmware") != 0)
 121                 return 1;
 122
 123         if (*len < 32) {
 124                 *len += read(imagefd, buf + *len, 32 - *len);
 125                 if (*len < 32) {
 126                         fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
 127                         return 0;
 128                 }
 129         }
 130
 131         if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
 132                 if (quiet < 2) {
 133                         fprintf(stderr, "Bad trx header\n");
 134                         fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
 135                                         "Please specify the correct file or use -f to force.\n");
 136                 }
 137                 return 0;
 138         }
 139
 140         /* check if image fits to mtd device */
 141         fd = mtd_check_open(mtd);
 142         if(fd < 0) {
 143                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 144                 exit(1);
 145         }
 146
 147         if(mtdsize < trx->len) {
 148                 fprintf(stderr, "Image too big for partition: %s\n", mtd);
 149                 close(fd);
 150                 return 0;
 151         }
 152
 153         close(fd);
 154         return 1;
 155 }
 156 #endif
 157
 158 int
 159 mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
 160 {
 161         size_t data_offset;
 162         int fd;
 163         struct trx_header *trx;
 164         char *first_block;
 165         char *buf, *to;
 166         ssize_t res;
 167         size_t block_offset;
 168
 169         if (quiet < 2)
 170                 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
 171
 172         fd = mtd_check_open(mtd);
 173         if(fd < 0) {
 174                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 175                 exit(1);
 176         }
 177
 178         data_offset = offset + TRX_CRC32_DATA_OFFSET;
 179         if (data_size)
 180                 data_size += TRX_CRC32_DATA_SIZE;
 181         else
 182                 data_size = erasesize - TRX_CRC32_DATA_OFFSET;
 183
 184         block_offset = offset & ~(erasesize - 1);
 185         offset -= block_offset;
 186
 187         if (data_offset + data_size > mtdsize) {
 188                 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 189                 exit(1);
 190         }
 191
 192         first_block = malloc(erasesize);
 193         if (!first_block) {
 194                 perror("malloc");
 195                 exit(1);
 196         }
 197
 198         res = pread(fd, first_block, erasesize, block_offset);
 199         if (res != erasesize) {
 200                 perror("pread");
 201                 exit(1);
 202         }
 203
 204         trx = (struct trx_header *)(first_block + offset);
 205         if (trx->magic != STORE32_LE(0x30524448)) {
 206                 fprintf(stderr, "No trx magic found\n");
 207                 exit(1);
 208         }
 209
 210         if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET)) {
 211                 if (quiet < 2)
 212                         fprintf(stderr, "Header already fixed, exiting\n");
 213                 close(fd);
 214                 return 0;
 215         }
 216
 217         buf = malloc(data_size);
 218         if (!buf) {
 219                 perror("malloc");
 220                 exit(1);
 221         }
 222
 223         to = buf;
 224         while (data_size) {
 225                 size_t read_block_offset = data_offset & ~(erasesize - 1);
 226                 size_t read_chunk;
 227
 228                 read_chunk = erasesize - (data_offset & (erasesize - 1));
 229                 read_chunk = min(read_chunk, data_size);
 230
 231                 /* Read from good blocks only to match CFE behavior */
 232                 if (!mtd_block_is_bad(fd, read_block_offset)) {
 233                         res = pread(fd, to, read_chunk, data_offset);
 234                         if (res != read_chunk) {
 235                                 perror("pread");
 236                                 exit(1);
 237                         }
 238                         to += read_chunk;
 239                 }
 240
 241                 data_offset += read_chunk;
 242                 data_size -= read_chunk;
 243         }
 244         data_size = to - buf;
 245
 246         trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
 247
 248         trx->crc32 = STORE32_LE(crc32buf(buf, data_size));
 249         if (mtd_erase_block(fd, block_offset)) {
 250                 fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 251                 exit(1);
 252         }
 253
 254         if (quiet < 2)
 255                 fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 256
 257         if (pwrite(fd, first_block, erasesize, block_offset) != erasesize) {
 258                 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
 259                 exit(1);
 260         }
 261
 262         if (quiet < 2)
 263                 fprintf(stderr, "Done.\n");
 264
 265         close (fd);
 266         sync();
 267         return 0;
 268
 269 }