tools/firmware-utils/src/airlink.c

   1 /*
   2  * Thanks to Vassily Galinsky for this tool
   3 *****************************************************************************
   4 AIRLINK AR525W firmware image structure
   5   -8:-5  Extended (httpd) header checksum  -       sum2
   6   -4:-1  Extended (httpd) header magic     -       "ARRN" - 0x4e525241
   7    0: 3  Standard (tftpd) header magic     -       "GMTK" - 0x4b544d47
   8    4: 7  Standard (tftpd) header checksum  -       sum1
   9    8: b  0
  10    c: f  Size of compressed linux kernel
  11   10:13  Size of firmware image file with standard header
  12   14:17  Product code                      -       0x5
  13   18:1b  Bootloader checksum               -       sum0
  14   1c:1f  0
  15   20:    Compressed linux kernel
  16   -      Squashfs or jffs2 file system - kernel dependent - either 32 bytes or sector aligned
  17 *****************************************************************************/
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <sys/mman.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25
  26 typedef unsigned long u32;
  27 typedef unsigned char uchar;
  28
  29 u32 crctab[257] = {
  30         0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
  31         0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
  32         0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  33         0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
  34         0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  35         0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  36         0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
  37         0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
  38         0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  39         0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  40         0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
  41         0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  42         0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
  43         0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
  44         0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  45         0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
  46         0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
  47         0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  48         0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
  49         0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  50         0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  51         0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
  52         0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
  53         0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  54         0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  55         0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
  56         0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  57         0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
  58         0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
  59         0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  60         0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
  61         0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
  62         0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  63         0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
  64         0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  65         0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  66         0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
  67         0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
  68         0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  69         0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  70         0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
  71         0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  72         0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
  73         0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
  74         0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  75         0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
  76         0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
  77         0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  78         0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
  79         0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  80         0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  81         0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
  82         0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
  83         0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  84         0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  85         0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
  86         0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  87         0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
  88         0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
  89         0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  90         0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
  91         0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
  92         0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  93         0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
  94         0
  95 };
  96
  97 u32 header[] = {
  98         0x00000000, 0x4e525241,
  99         0x4b544d47, 0x00000000, 0x00000000, 0x000afd4a,
 100         0x00000000, 0x00000005, 0x00000000, 0x00000000
 101 };
 102
 103 static int JFFS2 = 0;
 104
 105 int generate_image(char *kname, char *fsname, char *fname, int EHDR)
 106 {
 107         int i;
 108         u32 lenk, lens;
 109         uchar *bk, *bs;
 110         int fkd, ffd, fsd;
 111         int pad = 0x1f;
 112         fkd = open(kname, O_RDONLY);
 113         ffd = creat(fname, 0x644);
 114         if ((fkd < 0) || (ffd < 0))
 115                 return -1;
 116         if (fsname) {
 117                 fsd = open(fsname, O_RDONLY);
 118                 if (fsd < 0)
 119                         return -1;
 120         }
 121         lenk = lseek(fkd, 0, SEEK_END);
 122         header[5] = lenk;
 123         bk = (uchar *) mmap(NULL, lenk, PROT_READ, MAP_SHARED, fkd, 0);
 124         if (bk == MAP_FAILED)
 125                 return -1;
 126         if (fsname) {
 127                 lens = lseek(fsd, 0, SEEK_END);
 128                 bs = (uchar *) mmap(NULL, lens, PROT_READ, MAP_SHARED, fsd,
 129                                     0);
 130                 if (bs == MAP_FAILED)
 131                         return -1;
 132         }
 133         if (EHDR)
 134                 write(ffd, header, 0x28);
 135         else
 136                 write(ffd, header + 2, 0x20);
 137         write(ffd, bk, lenk);
 138         if (fsname && JFFS2)
 139                 pad = 0xffff;
 140         printf("Padding header+kernel - 0x%x +  0x%x = 0x%x\n",
 141                lenk + 0x20, ((lenk + 0x20) | pad) + 1 - lenk - 0x20,
 142                ((lenk + 0x20) | pad) + 1);
 143         for (i = 0; i < ((lenk + 0x20) | pad) + 1 - lenk - 0x20; i++)
 144                 write(ffd, header, 1);
 145         if (fsname) {
 146                 write(ffd, bs, lens);
 147                 close(fsd);
 148         }
 149         close(ffd);
 150         close(fkd);
 151         return 0;
 152 }
 153
 154 u32 crc32(uchar * buf, u32 len)
 155 {
 156         register int i;
 157         u32 sum;
 158         register u32 s0;
 159         s0 = ~0;
 160         for (i = 0; i < len; i++) {
 161                 s0 = (s0 >> 8) ^ crctab[(uchar) (s0 & 0xFF) ^ buf[i]];
 162         }
 163         sum = ~s0;
 164         return sum;
 165 }
 166
 167 void usage(char *prog)
 168 {
 169         printf("Usage: %s [-b 0/1] image_filename \n", prog);
 170         printf("       update checksums for firmware file\n");
 171         printf
 172             ("Usage: %s [-b 0/1] [-j] [-e] kernel filesystem image_filename \n",
 173              prog);
 174         printf("       generate firmware file and update checksums\n");
 175         printf("--------------------------------------------------\n");
 176         printf("       -e - generate header for web upload\n");
 177         printf("       -j - generate header for jffs2 filesystem\n");
 178         printf("       -b 0/1 - clear/update bootloader checksum\n");
 179 }
 180
 181 int main(int argc, char **argv)
 182 {
 183         uchar b[0x400];
 184         char EHDR = 0;
 185         char BHDR = 0;
 186         int c, fd;
 187         extern char *optarg;
 188         extern int optind, optopt;
 189
 190         while ((c = getopt(argc, argv, "b:e:j")) != -1) {
 191                 switch (c) {
 192                 case 'b':
 193                         if (optarg[0] == '1')
 194                                 BHDR = 1;
 195                         break;
 196                 case 'e':
 197                         EHDR = 1;
 198                         break;
 199                 case 'j':
 200                         JFFS2 = 1;
 201                         break;
 202                 case '?':
 203                         fprintf(stderr, "\nError: unknown arg %c\n\n\n",
 204                                 optopt);
 205                         usage(argv[0]);
 206                         exit(-1);
 207                 }
 208         }
 209         if (((argc - optind) < 1) && ((argc - optind) > 3)) {
 210                 usage(argv[0]);
 211                 exit(-1);
 212         }
 213         if ((argc - optind) == 3)
 214                 if (generate_image
 215                     (argv[optind], argv[optind + 1], argv[optind + 2],
 216                      EHDR)) {
 217                         fprintf(stderr,
 218                                 "\nError generating image file %s\n\n\n",
 219                                 argv[argc - 1]);
 220                         usage(argv[0]);
 221                         exit(-1);
 222                 }
 223         if ((argc - optind) == 2)
 224                 if (generate_image
 225                     (argv[optind], NULL, argv[optind + 1], EHDR)) {
 226                         fprintf(stderr,
 227                                 "\nError generating image file %s\n\n\n",
 228                                 argv[argc - 1]);
 229                         usage(argv[0]);
 230                         exit(-1);
 231                 }
 232
 233         fd = open(argv[argc - 1], O_RDWR);
 234         if (fd < 0) {
 235                 fprintf(stderr, "\nImage file not found %s\n\n\n",
 236                         argv[argc - 1]);
 237                 usage(argv[0]);
 238                 exit(-1);
 239         }
 240         long i, len = lseek(fd, 0, SEEK_END);
 241         lseek(fd, 0, SEEK_SET);
 242         uchar *buf = malloc(len);
 243         read(fd, buf, len);
 244         u32 sum, l0;
 245         u32 MagicS = 0x4b544d47;
 246         u32 MagicE = 0x4e525241;
 247         if (*((u32 *) buf) == MagicS) {
 248                 fprintf(stderr,
 249                         "Image without extra 8 bytes - Standard header\n");
 250                 *((u32 *) (buf + 0x10)) = len;
 251                 lseek(fd, 0x10, SEEK_SET);
 252                 write(fd, buf + 0x10, 0x4);
 253                 EHDR = 0;
 254         } else if ((*((u32 *) (buf + 0x8)) == MagicS)
 255                    && ((*((u32 *) (buf + 0x4)) == MagicE))) {
 256                 fprintf(stderr,
 257                         "Image with extra 8 bytes - Extended header\n");
 258                 *((u32 *) (buf + 0x18)) = len - 8;
 259                 lseek(fd, 0x18, SEEK_SET);
 260                 write(fd, buf + 0x18, 0x4);
 261                 buf += 8;
 262                 EHDR = 1;
 263         } else if (len == *((u32 *) (buf + 0x10))) {
 264                 fprintf(stderr,
 265                         "Image without extra 8 bytes - Standard header\n");
 266                 EHDR = 0;
 267         } else if (len == *((u32 *) (buf + 0x18)) + 8) {
 268                 fprintf(stderr,
 269                         "Image with extra 8 bytes - Extended header\n");
 270                 buf += 8;
 271                 EHDR = 1;
 272         } else {
 273                 fprintf(stderr, "ERROR: Wrong image size\n");
 274                 exit(-1);
 275         }
 276         l0 = *((u32 *) & buf[0x10]);
 277         if (!BHDR)
 278                 *((u32 *) & buf[0x18]) = 0;
 279         ulong sum0 = *((u32 *) & buf[0x18]);
 280         ulong sum1 = *((u32 *) & buf[0x4]);
 281         *((u32 *) & buf[0x4]) = 0x0L;
 282         for (i = 0; i < 0x100; i++)
 283                 b[i] = buf[i];
 284         for (i = 0; i < 0x100; i++)
 285                 b[0x100 + i] = buf[(l0 >> 1) + i];
 286         for (i = 0; i < 0x200; i++)
 287                 b[0x200 + i] = buf[l0 - 0x200 + i];
 288         *((u32 *) & b[0x18]) = 0x0L;
 289
 290         sum = crc32(b, 0x400);
 291         printf("CRC32 sum0 - (%x, %x, %x)\n", sum, sum0, 0x400);
 292         if (EHDR)
 293                 lseek(fd, 0x20, SEEK_SET);
 294         else
 295                 lseek(fd, 0x18, SEEK_SET);
 296         if (BHDR)
 297                 *((u32 *) & buf[0x18]) = sum;
 298         else
 299                 *((u32 *) & buf[0x18]) = sum0;
 300         write(fd, &buf[0x18], 0x4);
 301
 302         sum = crc32(buf, l0);
 303         printf("CRC32 sum1 - (%x, %x, %x)\n", sum, sum1, l0);
 304         if (EHDR)
 305                 lseek(fd, 0xC, SEEK_SET);
 306         else
 307                 lseek(fd, 0x4, SEEK_SET);
 308         *((u32 *) & buf[0x4]) = sum;
 309         write(fd, &buf[0x4], 0x4);
 310         if (EHDR) {
 311                 ulong sum2 = *((u32 *) & buf[-0x8]);
 312                 *((u32 *) & buf[-0x8]) = 0L;
 313                 sum = crc32(buf - 0x4, len - 0x4);
 314                 sum = htonl(sum);
 315                 printf("CRC32 sum2 - (%x, %x, %x)\n", sum, sum2,
 316                        len - 0x4);
 317                 lseek(fd, 0, SEEK_SET);
 318                 *((u32 *) & buf[-0x8]) = sum;
 319                 write(fd, &buf[-0x8], 0x4);
 320                 buf -= 8;
 321         }
 322         close(fd);
 323         free(buf);
 324         return 0;
 325 }