tools/firmware-utils/src/mktplinkfw.c

   1 /*
   2  * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
   3  *
   4  * This tool was based on:
   5  *   TP-Link WR941 V2 firmware checksum fixing tool.
   6  *   Copyright (C) 2008,2009 Wang Jian <lark@linux.net.cn>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <stdint.h>
  17 #include <string.h>
  18 #include <unistd.h>     /* for unlink() */
  19 #include <libgen.h>
  20 #include <getopt.h>     /* for getopt() */
  21 #include <stdarg.h>
  22 #include <errno.h>
  23 #include <sys/stat.h>
  24
  25 #include "md5.h"
  26
  27 #if (__BYTE_ORDER == __BIG_ENDIAN)
  28 #  define HOST_TO_BE32(x)       (x)
  29 #  define BE32_TO_HOST(x)       (x)
  30 #else
  31 #  define HOST_TO_BE32(x)       bswap_32(x)
  32 #  define BE32_TO_HOST(x)       bswap_32(x)
  33 #endif
  34
  35 #define HEADER_VERSION_V1       0x01000000
  36 #define HWID_TL_WA901ND_V1      0x09010001
  37 #define HWID_TL_WR741ND_V1      0x07410001
  38 #define HWID_TL_WR841N_V1_5     0x08410002
  39 #define HWID_TL_WR841ND_V3      0x08410003
  40 #define HWID_TL_WR841ND_V5      0x08410005
  41 #define HWID_TL_WR941ND_V2      0x09410002
  42 #define HWID_TL_WR941ND_V4      0x09410004
  43 #define HWID_TL_WR1043ND_V1     0x10430001
  44
  45 #define MD5SUM_LEN      16
  46
  47 struct file_info {
  48         char            *file_name;     /* name of the file */
  49         uint32_t        file_size;      /* length of the file */
  50 };
  51
  52 struct fw_header {
  53         uint32_t        version;        /* header version */
  54         char            vendor_name[24];
  55         char            fw_version[36];
  56         uint32_t        hw_id;          /* hardware id */
  57         uint32_t        hw_rev;         /* hardware revision */
  58         uint32_t        unk1;
  59         uint8_t         md5sum1[MD5SUM_LEN];
  60         uint32_t        unk2;
  61         uint8_t         md5sum2[MD5SUM_LEN];
  62         uint32_t        unk3;
  63         uint32_t        kernel_la;      /* kernel load address */
  64         uint32_t        kernel_ep;      /* kernel entry point */
  65         uint32_t        fw_length;      /* total length of the firmware */
  66         uint32_t        kernel_ofs;     /* kernel data offset */
  67         uint32_t        kernel_len;     /* kernel data length */
  68         uint32_t        rootfs_ofs;     /* rootfs data offset */
  69         uint32_t        rootfs_len;     /* rootfs data length */
  70         uint32_t        boot_ofs;       /* bootloader data offset */
  71         uint32_t        boot_len;       /* bootloader data length */
  72         uint8_t         pad[360];
  73 } __attribute__ ((packed));
  74
  75 struct board_info {
  76         char            *id;
  77         uint32_t        hw_id;
  78         uint32_t        hw_rev;
  79         uint32_t        fw_max_len;
  80         uint32_t        kernel_la;
  81         uint32_t        kernel_ep;
  82         uint32_t        rootfs_ofs;
  83 };
  84
  85 /*
  86  * Globals
  87  */
  88 static char *ofname;
  89 static char *progname;
  90 static char *vendor = "TP-LINK Technologies";
  91 static char *version = "ver. 1.0";
  92
  93 static char *board_id;
  94 static struct board_info *board;
  95 static struct file_info kernel_info;
  96 static struct file_info rootfs_info;
  97 static struct file_info boot_info;
  98 static int combined;
  99 static int strip_padding;
 100
 101 char md5salt_normal[MD5SUM_LEN] = {
 102         0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
 103         0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
 104 };
 105
 106 char md5salt_boot[MD5SUM_LEN] = {
 107         0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
 108         0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
 109 };
 110
 111 static struct board_info boards[] = {
 112         {
 113                 .id             = "TL-WA901NDv1",
 114                 .hw_id          = HWID_TL_WA901ND_V1,
 115                 .hw_rev         = 1,
 116                 .fw_max_len     = 0x3c0000,
 117                 .kernel_la      = 0x80060000,
 118                 .kernel_ep      = 0x80060000,
 119                 .rootfs_ofs     = 0x140000,
 120         }, {
 121                 .id             = "TL-WR741NDv1",
 122                 .hw_id          = HWID_TL_WR741ND_V1,
 123                 .hw_rev         = 1,
 124                 .fw_max_len     = 0x3c0000,
 125                 .kernel_la      = 0x80060000,
 126                 .kernel_ep      = 0x80060000,
 127                 .rootfs_ofs     = 0x140000,
 128         }, {
 129                 .id             = "TL-WR841Nv1.5",
 130                 .hw_id          = HWID_TL_WR841N_V1_5,
 131                 .hw_rev         = 2,
 132                 .fw_max_len     = 0x3c0000,
 133                 .kernel_la      = 0x80060000,
 134                 .kernel_ep      = 0x80060000,
 135                 .rootfs_ofs     = 0x140000,
 136         }, {
 137                 .id             = "TL-WR841NDv3",
 138                 .hw_id          = HWID_TL_WR841ND_V3,
 139                 .hw_rev         = 3,
 140                 .fw_max_len     = 0x3c0000,
 141                 .kernel_la      = 0x80060000,
 142                 .kernel_ep      = 0x80060000,
 143                 .rootfs_ofs     = 0x140000,
 144         }, {
 145                 .id             = "TL-WR841NDv5",
 146                 .hw_id          = HWID_TL_WR841ND_V5,
 147                 .hw_rev         = 1,
 148                 .fw_max_len     = 0x3c0000,
 149                 .kernel_la      = 0x80060000,
 150                 .kernel_ep      = 0x80060000,
 151                 .rootfs_ofs     = 0x140000,
 152         }, {
 153                 .id             = "TL-WR941NDv2",
 154                 .hw_id          = HWID_TL_WR941ND_V2,
 155                 .hw_rev         = 2,
 156                 .fw_max_len     = 0x3c0000,
 157                 .kernel_la      = 0x80060000,
 158                 .kernel_ep      = 0x80060000,
 159                 .rootfs_ofs     = 0x140000,
 160         }, {
 161                 .id             = "TL-WR941NDv4",
 162                 .hw_id          = HWID_TL_WR941ND_V4,
 163                 .hw_rev         = 1,
 164                 .fw_max_len     = 0x3c0000,
 165                 .kernel_la      = 0x80060000,
 166                 .kernel_ep      = 0x80060000,
 167                 .rootfs_ofs     = 0x140000,
 168         }, {
 169                 .id             = "TL-WR1043NDv1",
 170                 .hw_id          = HWID_TL_WR1043ND_V1,
 171                 .hw_rev         = 1,
 172                 .fw_max_len     = 0x7c0000,
 173                 .kernel_la      = 0x80060000,
 174                 .kernel_ep      = 0x80060000,
 175                 .rootfs_ofs     = 0x140000,
 176         }, {
 177                 /* terminating entry */
 178         }
 179 };
 180
 181 /*
 182  * Message macros
 183  */
 184 #define ERR(fmt, ...) do { \
 185         fflush(0); \
 186         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 187                         progname, ## __VA_ARGS__ ); \
 188 } while (0)
 189
 190 #define ERRS(fmt, ...) do { \
 191         int save = errno; \
 192         fflush(0); \
 193         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 194                         progname, ## __VA_ARGS__, strerror(save)); \
 195 } while (0)
 196
 197 #define DBG(fmt, ...) do { \
 198         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 199 } while (0)
 200
 201 static struct board_info *find_board(char *id)
 202 {
 203         struct board_info *ret;
 204         struct board_info *board;
 205
 206         ret = NULL;
 207         for (board = boards; board->id != NULL; board++){
 208                 if (strcasecmp(id, board->id) == 0) {
 209                         ret = board;
 210                         break;
 211                 }
 212         };
 213
 214         return ret;
 215 }
 216
 217 static void usage(int status)
 218 {
 219         FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
 220         struct board_info *board;
 221
 222         fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
 223         fprintf(stream,
 224 "\n"
 225 "Options:\n"
 226 "  -B <board>      create image for the board specified with <board>\n"
 227 "  -c              use combined kernel image\n"
 228 "  -k <file>       read kernel image from the file <file>\n"
 229 "  -r <file>       read rootfs image from the file <file>\n"
 230 "  -o <file>       write output to the file <file>\n"
 231 "  -s              strip padding from the end of the image\n"
 232 "  -N <vendor>     set image vendor to <vendor>\n"
 233 "  -V <version>    set image version to <version>\n"
 234 "  -h              show this screen\n"
 235         );
 236
 237         exit(status);
 238 }
 239
 240 static int get_md5(char *data, int size, char *md5)
 241 {
 242         MD5_CTX ctx;
 243
 244         MD5_Init(&ctx);
 245         MD5_Update(&ctx, data, size);
 246         MD5_Final(md5, &ctx);
 247 }
 248
 249 static int get_file_stat(struct file_info *fdata)
 250 {
 251         struct stat st;
 252         int res;
 253
 254         if (fdata->file_name == NULL)
 255                 return 0;
 256
 257         res = stat(fdata->file_name, &st);
 258         if (res){
 259                 ERRS("stat failed on %s", fdata->file_name);
 260                 return res;
 261         }
 262
 263         fdata->file_size = st.st_size;
 264         return 0;
 265 }
 266
 267 static int read_to_buf(struct file_info *fdata, char *buf)
 268 {
 269         FILE *f;
 270         int ret = EXIT_FAILURE;
 271
 272         f = fopen(fdata->file_name, "r");
 273         if (f == NULL) {
 274                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 275                 goto out;
 276         }
 277
 278         errno = 0;
 279         fread(buf, fdata->file_size, 1, f);
 280         if (errno != 0) {
 281                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 282                 goto out_close;
 283         }
 284
 285         ret = EXIT_SUCCESS;
 286
 287  out_close:
 288         fclose(f);
 289  out:
 290         return ret;
 291 }
 292
 293 static int check_options(void)
 294 {
 295         int ret;
 296
 297         if (board_id == NULL) {
 298                 ERR("no board specified");
 299                 return -1;
 300         }
 301
 302         board = find_board(board_id);
 303         if (board == NULL) {
 304                 ERR("unknown/unsupported board id \"%s\"", board_id);
 305                 return -1;
 306         }
 307
 308         if (kernel_info.file_name == NULL) {
 309                 ERR("no kernel image specified");
 310                 return -1;
 311         }
 312
 313         ret = get_file_stat(&kernel_info);
 314         if (ret)
 315                 return ret;
 316
 317         if (combined) {
 318                 if (kernel_info.file_size >
 319                     board->fw_max_len - sizeof(struct fw_header)) {
 320                         ERR("kernel image is too big");
 321                         return -1;
 322                 }
 323         } else {
 324                 if (kernel_info.file_size >
 325                     board->rootfs_ofs - sizeof(struct fw_header)) {
 326                         ERR("kernel image is too big");
 327                         return -1;
 328                 }
 329                 if (rootfs_info.file_name == NULL) {
 330                         ERR("no rootfs image specified");
 331                         return -1;
 332                 }
 333
 334                 ret = get_file_stat(&rootfs_info);
 335                 if (ret)
 336                         return ret;
 337
 338                 if (rootfs_info.file_size >
 339                     (board->fw_max_len - board->rootfs_ofs)) {
 340                         ERR("rootfs image is too big");
 341                         return -1;
 342                 }
 343         }
 344
 345         if (ofname == NULL) {
 346                 ERR("no output file specified");
 347                 return -1;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static void fill_header(char *buf, int len)
 354 {
 355         struct fw_header *hdr = (struct fw_header *)buf;
 356
 357         memset(hdr, 0, sizeof(struct fw_header));
 358
 359         hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
 360         strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
 361         strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
 362         hdr->hw_id = HOST_TO_BE32(board->hw_id);
 363         hdr->hw_rev = HOST_TO_BE32(board->hw_rev);
 364
 365         if (boot_info.file_size == 0)
 366                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
 367         else
 368                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
 369
 370         hdr->kernel_la = HOST_TO_BE32(board->kernel_la);
 371         hdr->kernel_ep = HOST_TO_BE32(board->kernel_ep);
 372         hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
 373         hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
 374         hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
 375         if (!combined) {
 376                 hdr->rootfs_ofs = HOST_TO_BE32(board->rootfs_ofs);
 377                 hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
 378         }
 379
 380         get_md5(buf, len, hdr->md5sum1);
 381 }
 382
 383 static int write_fw(char *data, int len)
 384 {
 385         FILE *f;
 386         int ret = EXIT_FAILURE;
 387
 388         f = fopen(ofname, "w");
 389         if (f == NULL) {
 390                 ERRS("could not open \"%s\" for writing", ofname);
 391                 goto out;
 392         }
 393
 394         errno = 0;
 395         fwrite(data, len, 1, f);
 396         if (errno) {
 397                 ERRS("unable to write output file");
 398                 goto out_flush;
 399         }
 400
 401         DBG("firmware file \"%s\" completed", ofname);
 402
 403         ret = EXIT_SUCCESS;
 404
 405  out_flush:
 406         fflush(f);
 407         fclose(f);
 408         if (ret != EXIT_SUCCESS) {
 409                 unlink(ofname);
 410         }
 411  out:
 412         return ret;
 413 }
 414
 415 static int build_fw(void)
 416 {
 417         int buflen;
 418         char *buf;
 419         char *p;
 420         int ret = EXIT_FAILURE;
 421         int writelen = 0;
 422
 423         buflen = board->fw_max_len;
 424
 425         buf = malloc(buflen);
 426         if (!buf) {
 427                 ERR("no memory for buffer\n");
 428                 goto out;
 429         }
 430
 431         memset(buf, 0xff, buflen);
 432         p = buf + sizeof(struct fw_header);
 433         ret = read_to_buf(&kernel_info, p);
 434         if (ret)
 435                 goto out_free_buf;
 436
 437         writelen = kernel_info.file_size;
 438
 439         if (!combined) {
 440                 p = buf + board->rootfs_ofs;
 441                 ret = read_to_buf(&rootfs_info, p);
 442                 if (ret)
 443                         goto out_free_buf;
 444
 445                 writelen = board->rootfs_ofs + rootfs_info.file_size;
 446         }
 447
 448         if (!strip_padding)
 449                 writelen = buflen;
 450
 451         fill_header(buf, writelen);
 452         ret = write_fw(buf, writelen);
 453         if (ret)
 454                 goto out_free_buf;
 455
 456         ret = EXIT_SUCCESS;
 457
 458  out_free_buf:
 459         free(buf);
 460  out:
 461         return ret;
 462 }
 463
 464 int main(int argc, char *argv[])
 465 {
 466         int ret = EXIT_FAILURE;
 467         int err;
 468
 469         FILE *outfile;
 470
 471         progname = basename(argv[0]);
 472
 473         while ( 1 ) {
 474                 int c;
 475
 476                 c = getopt(argc, argv, "B:V:N:ck:r:o:hs");
 477                 if (c == -1)
 478                         break;
 479
 480                 switch (c) {
 481                 case 'B':
 482                         board_id = optarg;
 483                         break;
 484                 case 'V':
 485                         version = optarg;
 486                         break;
 487                 case 'N':
 488                         vendor = optarg;
 489                         break;
 490                 case 'c':
 491                         combined++;
 492                         break;
 493                 case 'k':
 494                         kernel_info.file_name = optarg;
 495                         break;
 496                 case 'r':
 497                         rootfs_info.file_name = optarg;
 498                         break;
 499                 case 'o':
 500                         ofname = optarg;
 501                         break;
 502                 case 's':
 503                         strip_padding = 1;
 504                         break;
 505                 case 'h':
 506                         usage(EXIT_SUCCESS);
 507                         break;
 508                 default:
 509                         usage(EXIT_FAILURE);
 510                         break;
 511                 }
 512         }
 513
 514         ret = check_options();
 515         if (ret)
 516                 goto out;
 517
 518         ret = build_fw();
 519
 520  out:
 521         return ret;
 522 }
 523