| 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 <string.h> |
| 21 | #include <unistd.h> |
| 22 | #include <sys/mman.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <netinet/in.h> |
| 27 | |
| 28 | typedef unsigned char uchar; |
| 29 | |
| 30 | uint32_t crctab[257] = { |
| 31 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
| 32 | 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, |
| 33 | 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, |
| 34 | 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, |
| 35 | 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
| 36 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, |
| 37 | 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, |
| 38 | 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, |
| 39 | 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, |
| 40 | 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
| 41 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, |
| 42 | 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, |
| 43 | 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, |
| 44 | 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, |
| 45 | 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
| 46 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, |
| 47 | 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, |
| 48 | 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, |
| 49 | 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, |
| 50 | 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
| 51 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, |
| 52 | 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, |
| 53 | 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, |
| 54 | 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, |
| 55 | 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
| 56 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, |
| 57 | 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, |
| 58 | 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, |
| 59 | 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, |
| 60 | 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
| 61 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, |
| 62 | 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, |
| 63 | 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, |
| 64 | 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, |
| 65 | 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
| 66 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, |
| 67 | 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, |
| 68 | 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, |
| 69 | 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, |
| 70 | 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
| 71 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, |
| 72 | 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, |
| 73 | 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, |
| 74 | 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, |
| 75 | 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
| 76 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, |
| 77 | 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, |
| 78 | 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, |
| 79 | 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, |
| 80 | 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
| 81 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, |
| 82 | 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, |
| 83 | 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, |
| 84 | 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, |
| 85 | 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
| 86 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, |
| 87 | 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, |
| 88 | 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, |
| 89 | 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, |
| 90 | 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
| 91 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, |
| 92 | 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, |
| 93 | 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, |
| 94 | 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, |
| 95 | 0 |
| 96 | }; |
| 97 | |
| 98 | uint32_t header[] = { |
| 99 | 0x00000000, 0x4e525241, |
| 100 | 0x4b544d47, 0x00000000, 0x00000000, 0x000afd4a, |
| 101 | 0x00000000, 0x00000005, 0x00000000, 0x00000000 |
| 102 | }; |
| 103 | |
| 104 | static int JFFS2 = 0; |
| 105 | |
| 106 | int generate_image(char *kname, char *fsname, char *fname, int EHDR) |
| 107 | { |
| 108 | int i; |
| 109 | uint32_t lenk, lens; |
| 110 | uchar *bk, *bs; |
| 111 | int fkd, ffd, fsd; |
| 112 | fkd = open(kname, O_RDONLY); |
| 113 | ffd = creat(fname, 0644); |
| 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 | lenk += 0x20; |
| 139 | if (!JFFS2) JFFS2 = 0x20; |
| 140 | printf("Padding header+kernel - 0x%x + 0x%x = 0x%x\n", |
| 141 | lenk, ((lenk - 1 + JFFS2) / JFFS2) * JFFS2 - lenk, |
| 142 | ((lenk - 1 + JFFS2) / JFFS2) * JFFS2); |
| 143 | for (i = 0; i < ((lenk - 1 + JFFS2) / JFFS2) * JFFS2 - lenk; 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 | uint32_t crc32(uchar * buf, uint32_t len) |
| 155 | { |
| 156 | register int i; |
| 157 | uint32_t sum; |
| 158 | register uint32_t 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 erasesize_in_kibytes] [-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(" -b 0/1 - clear/update bootloader checksum\n"); |
| 178 | printf(" -j erasesize_in_kibytes - generate header for jffs2 filesystem\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:ej:")) != -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 | sscanf(optarg, "%i", &JFFS2); |
| 201 | JFFS2 *= 1024; |
| 202 | break; |
| 203 | case '?': |
| 204 | fprintf(stderr, "\nError: unknown arg %c\n\n\n", |
| 205 | optopt); |
| 206 | usage(argv[0]); |
| 207 | exit(-1); |
| 208 | } |
| 209 | } |
| 210 | if (((argc - optind) < 1) && ((argc - optind) > 3)) { |
| 211 | usage(argv[0]); |
| 212 | exit(-1); |
| 213 | } |
| 214 | if ((argc - optind) == 3) |
| 215 | if (generate_image |
| 216 | (argv[optind], argv[optind + 1], argv[optind + 2], |
| 217 | EHDR)) { |
| 218 | fprintf(stderr, |
| 219 | "\nError generating image file %s\n\n\n", |
| 220 | argv[argc - 1]); |
| 221 | usage(argv[0]); |
| 222 | exit(-1); |
| 223 | } |
| 224 | if ((argc - optind) == 2) |
| 225 | if (generate_image |
| 226 | (argv[optind], NULL, argv[optind + 1], EHDR)) { |
| 227 | fprintf(stderr, |
| 228 | "\nError generating image file %s\n\n\n", |
| 229 | argv[argc - 1]); |
| 230 | usage(argv[0]); |
| 231 | exit(-1); |
| 232 | } |
| 233 | |
| 234 | fd = open(argv[argc - 1], O_RDWR); |
| 235 | if (fd < 0) { |
| 236 | fprintf(stderr, "\nImage file not found %s\n\n\n", |
| 237 | argv[argc - 1]); |
| 238 | usage(argv[0]); |
| 239 | exit(-1); |
| 240 | } |
| 241 | long i, len = lseek(fd, 0, SEEK_END); |
| 242 | lseek(fd, 0, SEEK_SET); |
| 243 | uchar *buf = malloc(len); |
| 244 | read(fd, buf, len); |
| 245 | uint32_t sum, l0; |
| 246 | uint32_t MagicS = 0x474d544b; |
| 247 | uint32_t MagicE = 0x4152524e; |
| 248 | if (ntohl(*((uint32_t *) buf)) == MagicS) { |
| 249 | fprintf(stderr, |
| 250 | "Image without extra 8 bytes - Standard header\n"); |
| 251 | buf[0x10] = len & 0xff; |
| 252 | buf[0x11] = (len >> 8) & 0xff; |
| 253 | buf[0x12] = (len >> 16) & 0xff; |
| 254 | buf[0x13] = (len >> 24) & 0xff; |
| 255 | lseek(fd, 0x10, SEEK_SET); |
| 256 | write(fd, buf + 0x10, 0x4); |
| 257 | EHDR = 0; |
| 258 | } else if ((ntohl(*((uint32_t *) (buf + 0x8))) == MagicS) |
| 259 | && ((ntohl(*((uint32_t *) (buf + 0x4))) == MagicE))) { |
| 260 | fprintf(stderr, |
| 261 | "Image with extra 8 bytes - Extended header\n"); |
| 262 | *((uint32_t *) (buf + 0x18)) = len - 8; |
| 263 | buf[0x18] = (len - 8) & 0xff; |
| 264 | buf[0x19] = ((len - 8) >> 8) & 0xff; |
| 265 | buf[0x1a] = ((len - 8) >> 16) & 0xff; |
| 266 | buf[0x1b] = ((len - 8) >> 24) & 0xff; |
| 267 | lseek(fd, 0x18, SEEK_SET); |
| 268 | write(fd, buf + 0x18, 0x4); |
| 269 | buf += 8; |
| 270 | EHDR = 1; |
| 271 | } else if (len == buf[0x10] | ((uint32_t)buf[0x11] << 8) | ((uint32_t)buf[0x12] << 16) | ((uint32_t)buf[0x13] << 24)) { |
| 272 | fprintf(stderr, |
| 273 | "Image without extra 8 bytes - Standard header\n"); |
| 274 | EHDR = 0; |
| 275 | } else if (len == (buf[0x18] | ((uint32_t)buf[0x19] << 8) | ((uint32_t)buf[0x1a] << 16) | ((uint32_t)buf[0x1b] << 24)) + 8) { |
| 276 | fprintf(stderr, |
| 277 | "Image with extra 8 bytes - Extended header\n"); |
| 278 | buf += 8; |
| 279 | EHDR = 1; |
| 280 | } else { |
| 281 | fprintf(stderr, "ERROR: Wrong image size\n"); |
| 282 | exit(-1); |
| 283 | } |
| 284 | l0 = buf[0x10] | ((uint32_t)buf[0x11] << 8) | ((uint32_t)buf[0x12] << 16) | ((uint32_t)buf[0x13] << 24); |
| 285 | if (!BHDR) |
| 286 | *((uint32_t *) & buf[0x18]) = 0; |
| 287 | unsigned long sum0 = buf[0x18] | ((uint32_t)buf[0x19] << 8) | ((uint32_t)buf[0x1a] << 16) | ((uint32_t)buf[0x1b] << 24); |
| 288 | unsigned long sum1 = buf[0x4] | ((uint32_t)buf[0x5] << 8) | ((uint32_t)buf[0x6] << 16) | ((uint32_t)buf[0x7] << 24); |
| 289 | *((uint32_t *) & buf[0x4]) = 0x0L; |
| 290 | memcpy(b, buf, 0x100); |
| 291 | memcpy(b + 0x100, buf + ((l0 >> 1) - ((l0 & 0x6) >> 1)), 0x100); |
| 292 | memcpy(b + 0x200, buf + (l0 - 0x200), 0x200); |
| 293 | *((uint32_t *) & b[0x18]) = 0x0L; |
| 294 | |
| 295 | sum = crc32(b, 0x400); |
| 296 | printf("CRC32 sum0 - (%x, %x, %x)\n", sum, sum0, 0x400); |
| 297 | if (EHDR) |
| 298 | lseek(fd, 0x20, SEEK_SET); |
| 299 | else |
| 300 | lseek(fd, 0x18, SEEK_SET); |
| 301 | buf[0x18] = (BHDR ? sum : sum0) & 0xff; |
| 302 | buf[0x19] = ((BHDR ? sum : sum0) >> 8) & 0xff; |
| 303 | buf[0x1a] = ((BHDR ? sum : sum0) >> 16) & 0xff; |
| 304 | buf[0x1b] = ((BHDR ? sum : sum0) >> 24) & 0xff; |
| 305 | write(fd, &buf[0x18], 0x4); |
| 306 | |
| 307 | sum = crc32(buf, l0); |
| 308 | printf("CRC32 sum1 - (%x, %x, %x)\n", sum, sum1, l0); |
| 309 | if (EHDR) |
| 310 | lseek(fd, 0xC, SEEK_SET); |
| 311 | else |
| 312 | lseek(fd, 0x4, SEEK_SET); |
| 313 | buf[0x4] = sum & 0xff; |
| 314 | buf[0x5] = (sum >> 8) & 0xff; |
| 315 | buf[0x6] = (sum >> 16) & 0xff; |
| 316 | buf[0x7] = (sum >> 24) & 0xff; |
| 317 | write(fd, &buf[0x4], 0x4); |
| 318 | if (EHDR) { |
| 319 | unsigned long sum2 = buf[-0x8] | ((uint32_t)buf[-0x7] << 8) | ((uint32_t)buf[-0x6] << 16) | ((uint32_t)buf[-0x5] << 24); |
| 320 | *((uint32_t *) & buf[-0x8]) = 0L; |
| 321 | sum = crc32(buf - 0x4, len - 0x4); |
| 322 | printf("CRC32 sum2 - (%x, %x, %x)\n", sum, sum2, |
| 323 | len - 0x4); |
| 324 | lseek(fd, 0, SEEK_SET); |
| 325 | *((uint32_t *) & buf[-0x8]) = htonl(sum); |
| 326 | write(fd, &buf[-0x8], 0x4); |
| 327 | buf -= 8; |
| 328 | } |
| 329 | close(fd); |
| 330 | free(buf); |
| 331 | return 0; |
| 332 | } |
| 333 | |
