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 = 0x20;
 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         fkd = open(kname, O_RDONLY);
 112         ffd = creat(fname, 0x644);
 113         if ((fkd < 0) || (ffd < 0))
 114                 return -1;
 115         if (fsname) {
 116                 fsd = open(fsname, O_RDONLY);
 117                 if (fsd < 0)
 118                         return -1;
 119         }
 120         lenk = lseek(fkd, 0, SEEK_END);
 121         header[5] = lenk;
 122         bk = (uchar *) mmap(NULL, lenk, PROT_READ, MAP_SHARED, fkd, 0);
 123         if (bk == MAP_FAILED)
 124                 return -1;
 125         if (fsname) {
 126                 lens = lseek(fsd, 0, SEEK_END);
 127                 bs = (uchar *) mmap(NULL, lens, PROT_READ, MAP_SHARED, fsd,
 128                                     0);
 129                 if (bs == MAP_FAILED)
 130                         return -1;
 131         }
 132         if (EHDR)
 133                 write(ffd, header, 0x28);
 134         else
 135                 write(ffd, header + 2, 0x20);
 136         write(ffd, bk, lenk);
 137         printf("Padding header+kernel - 0x%x +  0x%x = 0x%x\n",
 138                lenk, ((lenk - 1 + JFFS2) / JFFS2) * JFFS2 - lenk,
 139                ((lenk - 1 + JFFS2) / JFFS2) * JFFS2);
 140         for (i = 0; i < ((lenk - 1 + JFFS2) / JFFS2) * JFFS2 - lenk; i++)
 141                 write(ffd, header, 1);
 142         if (fsname) {
 143                 write(ffd, bs, lens);
 144                 close(fsd);
 145         }
 146         close(ffd);
 147         close(fkd);
 148         return 0;
 149 }
 150
 151 u32 crc32(uchar * buf, u32 len)
 152 {
 153         register int i;
 154         u32 sum;
 155         register u32 s0;
 156         s0 = ~0;
 157         for (i = 0; i < len; i++) {
 158                 s0 = (s0 >> 8) ^ crctab[(uchar) (s0 & 0xFF) ^ buf[i]];
 159         }
 160         sum = ~s0;
 161         return sum;
 162 }
 163
 164 void usage(char *prog)
 165 {
 166         printf("Usage: %s [-b 0/1] image_filename \n", prog);
 167         printf("       update checksums for firmware file\n");
 168         printf
 169             ("Usage: %s [-b 0/1] [-j erasesize_in_kibytes] [-e] kernel filesystem image_filename \n",
 170              prog);
 171         printf("       generate firmware file and update checksums\n");
 172         printf("--------------------------------------------------\n");
 173         printf("       -e - generate header for web upload\n");
 174         printf("       -b 0/1 - clear/update bootloader checksum\n");
 175         printf("       -j erasesize_in_kibytes - generate header for jffs2 filesystem\n");
 176 }
 177
 178 int main(int argc, char **argv)
 179 {
 180         uchar b[0x400];
 181         char EHDR = 0;
 182         char BHDR = 0;
 183         int c, fd;
 184         extern char *optarg;
 185         extern int optind, optopt;
 186
 187         while ((c = getopt(argc, argv, "b:ej:")) != -1) {
 188                 switch (c) {
 189                 case 'b':
 190                         if (optarg[0] == '1')
 191                                 BHDR = 1;
 192                         break;
 193                 case 'e':
 194                         EHDR = 1;
 195                         break;
 196                 case 'j':
 197                         sscanf(optarg, "%i", &JFFS2);
 198                         JFFS2 *= 1024;
 199                         break;
 200                 case '?':
 201                         fprintf(stderr, "\nError: unknown arg %c\n\n\n",
 202                                 optopt);
 203                         usage(argv[0]);
 204                         exit(-1);
 205                 }
 206         }
 207         if (((argc - optind) < 1) && ((argc - optind) > 3)) {
 208                 usage(argv[0]);
 209                 exit(-1);
 210         }
 211         if ((argc - optind) == 3)
 212                 if (generate_image
 213                     (argv[optind], argv[optind + 1], argv[optind + 2],
 214                      EHDR)) {
 215                         fprintf(stderr,
 216                                 "\nError generating image file %s\n\n\n",
 217                                 argv[argc - 1]);
 218                         usage(argv[0]);
 219                         exit(-1);
 220                 }
 221         if ((argc - optind) == 2)
 222                 if (generate_image
 223                     (argv[optind], NULL, argv[optind + 1], EHDR)) {
 224                         fprintf(stderr,
 225                                 "\nError generating image file %s\n\n\n",
 226                                 argv[argc - 1]);
 227                         usage(argv[0]);
 228                         exit(-1);
 229                 }
 230
 231         fd = open(argv[argc - 1], O_RDWR);
 232         if (fd < 0) {
 233                 fprintf(stderr, "\nImage file not found %s\n\n\n",
 234                         argv[argc - 1]);
 235                 usage(argv[0]);
 236                 exit(-1);
 237         }
 238         long i, len = lseek(fd, 0, SEEK_END);
 239         lseek(fd, 0, SEEK_SET);
 240         uchar *buf = malloc(len);
 241         read(fd, buf, len);
 242         u32 sum, l0;
 243         u32 MagicS = 0x4b544d47;
 244         u32 MagicE = 0x4e525241;
 245         if (*((u32 *) buf) == MagicS) {
 246                 fprintf(stderr,
 247                         "Image without extra 8 bytes - Standard header\n");
 248                 *((u32 *) (buf + 0x10)) = len;
 249                 lseek(fd, 0x10, SEEK_SET);
 250                 write(fd, buf + 0x10, 0x4);
 251                 EHDR = 0;
 252         } else if ((*((u32 *) (buf + 0x8)) == MagicS)
 253                    && ((*((u32 *) (buf + 0x4)) == MagicE))) {
 254                 fprintf(stderr,
 255                         "Image with extra 8 bytes - Extended header\n");
 256                 *((u32 *) (buf + 0x18)) = len - 8;
 257                 lseek(fd, 0x18, SEEK_SET);
 258                 write(fd, buf + 0x18, 0x4);
 259                 buf += 8;
 260                 EHDR = 1;
 261         } else if (len == *((u32 *) (buf + 0x10))) {
 262                 fprintf(stderr,
 263                         "Image without extra 8 bytes - Standard header\n");
 264                 EHDR = 0;
 265         } else if (len == *((u32 *) (buf + 0x18)) + 8) {
 266                 fprintf(stderr,
 267                         "Image with extra 8 bytes - Extended header\n");
 268                 buf += 8;
 269                 EHDR = 1;
 270         } else {
 271                 fprintf(stderr, "ERROR: Wrong image size\n");
 272                 exit(-1);
 273         }
 274         l0 = *((u32 *) & buf[0x10]);
 275         if (!BHDR)
 276                 *((u32 *) & buf[0x18]) = 0;
 277         unsigned long sum0 = *((u32 *) & buf[0x18]);
 278         unsigned long sum1 = *((u32 *) & buf[0x4]);
 279         *((u32 *) & buf[0x4]) = 0x0L;
 280         for (i = 0; i < 0x100; i++)
 281                 b[i] = buf[i];
 282         for (i = 0; i < 0x100; i++)
 283                 b[0x100 + i] = buf[(l0 >> 1) + i];
 284         for (i = 0; i < 0x200; i++)
 285                 b[0x200 + i] = buf[l0 - 0x200 + i];
 286         *((u32 *) & b[0x18]) = 0x0L;
 287
 288         sum = crc32(b, 0x400);
 289         printf("CRC32 sum0 - (%x, %x, %x)\n", sum, sum0, 0x400);
 290         if (EHDR)
 291                 lseek(fd, 0x20, SEEK_SET);
 292         else
 293                 lseek(fd, 0x18, SEEK_SET);
 294         if (BHDR)
 295                 *((u32 *) & buf[0x18]) = sum;
 296         else
 297                 *((u32 *) & buf[0x18]) = sum0;
 298         write(fd, &buf[0x18], 0x4);
 299
 300         sum = crc32(buf, l0);
 301         printf("CRC32 sum1 - (%x, %x, %x)\n", sum, sum1, l0);
 302         if (EHDR)
 303                 lseek(fd, 0xC, SEEK_SET);
 304         else
 305                 lseek(fd, 0x4, SEEK_SET);
 306         *((u32 *) & buf[0x4]) = sum;
 307         write(fd, &buf[0x4], 0x4);
 308         if (EHDR) {
 309                 unsigned long sum2 = *((u32 *) & buf[-0x8]);
 310                 *((u32 *) & buf[-0x8]) = 0L;
 311                 sum = crc32(buf - 0x4, len - 0x4);
 312                 sum = htonl(sum);
 313                 printf("CRC32 sum2 - (%x, %x, %x)\n", sum, sum2,
 314                        len - 0x4);
 315                 lseek(fd, 0, SEEK_SET);
 316                 *((u32 *) & buf[-0x8]) = sum;
 317                 write(fd, &buf[-0x8], 0x4);
 318                 buf -= 8;
 319         }
 320         close(fd);
 321         free(buf);
 322         return 0;
 323 }