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_WR741ND_V1      0x07410001
  37 #define HWID_TL_WR841N_V1_5     0x08410002
  38 #define HWID_TL_WR841ND_V3      0x08410003
  39 #define HWID_TL_WR841ND_V5      0x08410005
  40 #define HWID_TL_WR941ND_V2      0x09410002
  41 #define HWID_TL_WR941ND_V4      0x09410004
  42 #define HWID_TL_WR1043ND_V1     0x10430001
  43
  44 #define MD5SUM_LEN      16
  45
  46 struct file_info {
  47         char            *file_name;     /* name of the file */
  48         uint32_t        file_size;      /* length of the file */
  49 };
  50
  51 struct fw_header {
  52         uint32_t        version;        /* header version */
  53         char            vendor_name[24];
  54         char            fw_version[36];
  55         uint32_t        hw_id;          /* hardware id */
  56         uint32_t        hw_rev;         /* hardware revision */
  57         uint32_t        unk1;
  58         uint8_t         md5sum1[MD5SUM_LEN];
  59         uint32_t        unk2;
  60         uint8_t         md5sum2[MD5SUM_LEN];
  61         uint32_t        unk3;
  62         uint32_t        kernel_la;      /* kernel load address */
  63         uint32_t        kernel_ep;      /* kernel entry point */
  64         uint32_t        fw_length;      /* total length of the firmware */
  65         uint32_t        kernel_ofs;     /* kernel data offset */
  66         uint32_t        kernel_len;     /* kernel data length */
  67         uint32_t        rootfs_ofs;     /* rootfs data offset */
  68         uint32_t        rootfs_len;     /* rootfs data length */
  69         uint32_t        boot_ofs;       /* bootloader data offset */
  70         uint32_t        boot_len;       /* bootloader data length */
  71         uint8_t         pad[360];
  72 } __attribute__ ((packed));
  73
  74 struct board_info {
  75         char            *id;
  76         uint32_t        hw_id;
  77         uint32_t        hw_rev;
  78         uint32_t        fw_max_len;
  79         uint32_t        kernel_la;
  80         uint32_t        kernel_ep;
  81         uint32_t        rootfs_ofs;
  82 };
  83
  84 /*
  85  * Globals
  86  */
  87 static char *ofname;
  88 static char *progname;
  89 static char *vendor = "TP-LINK Technologies";
  90 static char *version = "ver. 1.0";
  91
  92 static char *board_id;
  93 static struct board_info *board;
  94 static struct file_info kernel_info;
  95 static struct file_info rootfs_info;
  96 static struct file_info boot_info;
  97 static int combined;
  98
  99 char md5salt_normal[MD5SUM_LEN] = {
 100         0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
 101         0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
 102 };
 103
 104 char md5salt_boot[MD5SUM_LEN] = {
 105         0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
 106         0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
 107 };
 108
 109 static struct board_info boards[] = {
 110         {
 111                 .id             = "TL-WR741NDv1",
 112                 .hw_id          = HWID_TL_WR741ND_V1,
 113                 .hw_rev         = 1,
 114                 .fw_max_len     = 0x3c0000,
 115                 .kernel_la      = 0x80060000,
 116                 .kernel_ep      = 0x80060000,
 117                 .rootfs_ofs     = 0x140000,
 118         }, {
 119                 .id             = "TL-WR841Nv1.5",
 120                 .hw_id          = HWID_TL_WR841N_V1_5,
 121                 .hw_rev         = 2,
 122                 .fw_max_len     = 0x3c0000,
 123                 .kernel_la      = 0x80060000,
 124                 .kernel_ep      = 0x80060000,
 125                 .rootfs_ofs     = 0x140000,
 126         }, {
 127                 .id             = "TL-WR841NDv3",
 128                 .hw_id          = HWID_TL_WR841ND_V3,
 129                 .hw_rev         = 3,
 130                 .fw_max_len     = 0x3c0000,
 131                 .kernel_la      = 0x80060000,
 132                 .kernel_ep      = 0x80060000,
 133                 .rootfs_ofs     = 0x140000,
 134         }, {
 135                 .id             = "TL-WR841NDv5",
 136                 .hw_id          = HWID_TL_WR841ND_V5,
 137                 .hw_rev         = 1,
 138                 .fw_max_len     = 0x3c0000,
 139                 .kernel_la      = 0x80060000,
 140                 .kernel_ep      = 0x80060000,
 141                 .rootfs_ofs     = 0x140000,
 142         }, {
 143                 .id             = "TL-WR941NDv2",
 144                 .hw_id          = HWID_TL_WR941ND_V2,
 145                 .hw_rev         = 2,
 146                 .fw_max_len     = 0x3c0000,
 147                 .kernel_la      = 0x80060000,
 148                 .kernel_ep      = 0x80060000,
 149                 .rootfs_ofs     = 0x140000,
 150         }, {
 151                 .id             = "TL-WR941NDv4",
 152                 .hw_id          = HWID_TL_WR941ND_V4,
 153                 .hw_rev         = 1,
 154                 .fw_max_len     = 0x3c0000,
 155                 .kernel_la      = 0x80060000,
 156                 .kernel_ep      = 0x80060000,
 157                 .rootfs_ofs     = 0x140000,
 158         }, {
 159                 .id             = "TL-WR1043NDv1",
 160                 .hw_id          = HWID_TL_WR1043ND_V1,
 161                 .hw_rev         = 1,
 162                 .fw_max_len     = 0x7c0000,
 163                 .kernel_la      = 0x80060000,
 164                 .kernel_ep      = 0x80060000,
 165                 .rootfs_ofs     = 0x140000,
 166         }, {
 167                 /* terminating entry */
 168         }
 169 };
 170
 171 /*
 172  * Message macros
 173  */
 174 #define ERR(fmt, ...) do { \
 175         fflush(0); \
 176         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 177                         progname, ## __VA_ARGS__ ); \
 178 } while (0)
 179
 180 #define ERRS(fmt, ...) do { \
 181         int save = errno; \
 182         fflush(0); \
 183         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 184                         progname, ## __VA_ARGS__, strerror(save)); \
 185 } while (0)
 186
 187 #define DBG(fmt, ...) do { \
 188         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 189 } while (0)
 190
 191 static struct board_info *find_board(char *id)
 192 {
 193         struct board_info *ret;
 194         struct board_info *board;
 195
 196         ret = NULL;
 197         for (board = boards; board->id != NULL; board++){
 198                 if (strcasecmp(id, board->id) == 0) {
 199                         ret = board;
 200                         break;
 201                 }
 202         };
 203
 204         return ret;
 205 }
 206
 207 static void usage(int status)
 208 {
 209         FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
 210         struct board_info *board;
 211
 212         fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
 213         fprintf(stream,
 214 "\n"
 215 "Options:\n"
 216 "  -B <board>      create image for the board specified with <board>\n"
 217 "  -c              use combined kernel image\n"
 218 "  -k <file>       read kernel image from the file <file>\n"
 219 "  -r <file>       read rootfs image from the file <file>\n"
 220 "  -o <file>       write output to the file <file>\n"
 221 "  -v <version>    set image version to <version>\n"
 222 "  -h              show this screen\n"
 223         );
 224
 225         exit(status);
 226 }
 227
 228 static int get_md5(char *data, int size, char *md5)
 229 {
 230         MD5_CTX ctx;
 231
 232         MD5_Init(&ctx);
 233         MD5_Update(&ctx, data, size);
 234         MD5_Final(md5, &ctx);
 235 }
 236
 237 static int get_file_stat(struct file_info *fdata)
 238 {
 239         struct stat st;
 240         int res;
 241
 242         if (fdata->file_name == NULL)
 243                 return 0;
 244
 245         res = stat(fdata->file_name, &st);
 246         if (res){
 247                 ERRS("stat failed on %s", fdata->file_name);
 248                 return res;
 249         }
 250
 251         fdata->file_size = st.st_size;
 252         return 0;
 253 }
 254
 255 static int read_to_buf(struct file_info *fdata, char *buf)
 256 {
 257         FILE *f;
 258         int ret = EXIT_FAILURE;
 259
 260         f = fopen(fdata->file_name, "r");
 261         if (f == NULL) {
 262                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 263                 goto out;
 264         }
 265
 266         errno = 0;
 267         fread(buf, fdata->file_size, 1, f);
 268         if (errno != 0) {
 269                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 270                 goto out_close;
 271         }
 272
 273         ret = EXIT_SUCCESS;
 274
 275  out_close:
 276         fclose(f);
 277  out:
 278         return ret;
 279 }
 280
 281 static int check_options(void)
 282 {
 283         int ret;
 284
 285         if (board_id == NULL) {
 286                 ERR("no board specified");
 287                 return -1;
 288         }
 289
 290         board = find_board(board_id);
 291         if (board == NULL) {
 292                 ERR("unknown/unsupported board id \"%s\"", board_id);
 293                 return -1;
 294         }
 295
 296         if (kernel_info.file_name == NULL) {
 297                 ERR("no kernel image specified");
 298                 return -1;
 299         }
 300
 301         ret = get_file_stat(&kernel_info);
 302         if (ret)
 303                 return ret;
 304
 305         if (combined) {
 306                 if (kernel_info.file_size >
 307                     board->fw_max_len - sizeof(struct fw_header)) {
 308                         ERR("kernel image is too big");
 309                         return -1;
 310                 }
 311         } else {
 312                 if (kernel_info.file_size >
 313                     board->rootfs_ofs - sizeof(struct fw_header)) {
 314                         ERR("kernel image is too big");
 315                         return -1;
 316                 }
 317                 if (rootfs_info.file_name == NULL) {
 318                         ERR("no rootfs image specified");
 319                         return -1;
 320                 }
 321
 322                 ret = get_file_stat(&rootfs_info);
 323                 if (ret)
 324                         return ret;
 325
 326                 if (rootfs_info.file_size >
 327                     (board->fw_max_len - board->rootfs_ofs)) {
 328                         ERR("rootfs image is too big");
 329                         return -1;
 330                 }
 331         }
 332
 333         if (ofname == NULL) {
 334                 ERR("no output file specified");
 335                 return -1;
 336         }
 337
 338         return 0;
 339 }
 340
 341 static void fill_header(char *buf, int len)
 342 {
 343         struct fw_header *hdr = (struct fw_header *)buf;
 344
 345         memset(hdr, 0, sizeof(struct fw_header));
 346
 347         hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
 348         strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
 349         strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
 350         hdr->hw_id = HOST_TO_BE32(board->hw_id);
 351         hdr->hw_rev = HOST_TO_BE32(board->hw_rev);
 352
 353         if (boot_info.file_size == 0)
 354                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
 355         else
 356                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
 357
 358         hdr->kernel_la = HOST_TO_BE32(board->kernel_la);
 359         hdr->kernel_ep = HOST_TO_BE32(board->kernel_ep);
 360         hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
 361         hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
 362         hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
 363         if (!combined) {
 364                 hdr->rootfs_ofs = HOST_TO_BE32(board->rootfs_ofs);
 365                 hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
 366         }
 367
 368         get_md5(buf, len, hdr->md5sum1);
 369 }
 370
 371 static int write_fw(char *data, int len)
 372 {
 373         FILE *f;
 374         int ret = EXIT_FAILURE;
 375
 376         f = fopen(ofname, "w");
 377         if (f == NULL) {
 378                 ERRS("could not open \"%s\" for writing", ofname);
 379                 goto out;
 380         }
 381
 382         errno = 0;
 383         fwrite(data, len, 1, f);
 384         if (errno) {
 385                 ERRS("unable to write output file");
 386                 goto out_flush;
 387         }
 388
 389         DBG("firmware file \"%s\" completed", ofname);
 390
 391         ret = EXIT_SUCCESS;
 392
 393  out_flush:
 394         fflush(f);
 395         fclose(f);
 396         if (ret != EXIT_SUCCESS) {
 397                 unlink(ofname);
 398         }
 399  out:
 400         return ret;
 401 }
 402
 403 static int build_fw(void)
 404 {
 405         int buflen;
 406         char *buf;
 407         char *p;
 408         int ret = EXIT_FAILURE;
 409
 410         buflen = board->fw_max_len;
 411
 412         buf = malloc(buflen);
 413         if (!buf) {
 414                 ERR("no memory for buffer\n");
 415                 goto out;
 416         }
 417
 418         memset(buf, 0xff, buflen);
 419         p = buf + sizeof(struct fw_header);
 420         ret = read_to_buf(&kernel_info, p);
 421         if (ret)
 422                 goto out_free_buf;
 423
 424         if (!combined) {
 425                 p = buf + board->rootfs_ofs;
 426                 ret = read_to_buf(&rootfs_info, p);
 427                 if (ret)
 428                         goto out_free_buf;
 429         }
 430
 431         fill_header(buf, buflen);
 432
 433         ret = write_fw(buf, buflen);
 434         if (ret)
 435                 goto out_free_buf;
 436
 437         ret = EXIT_SUCCESS;
 438
 439  out_free_buf:
 440         free(buf);
 441  out:
 442         return ret;
 443 }
 444
 445 int main(int argc, char *argv[])
 446 {
 447         int ret = EXIT_FAILURE;
 448         int err;
 449
 450         FILE *outfile;
 451
 452         progname = basename(argv[0]);
 453
 454         while ( 1 ) {
 455                 int c;
 456
 457                 c = getopt(argc, argv, "B:V:N:ck:r:o:v:h:");
 458                 if (c == -1)
 459                         break;
 460
 461                 switch (c) {
 462                 case 'B':
 463                         board_id = optarg;
 464                         break;
 465                 case 'V':
 466                         version = optarg;
 467                         break;
 468                 case 'N':
 469                         vendor = optarg;
 470                         break;
 471                 case 'c':
 472                         combined++;
 473                         break;
 474                 case 'k':
 475                         kernel_info.file_name = optarg;
 476                         break;
 477                 case 'r':
 478                         rootfs_info.file_name = optarg;
 479                         break;
 480                 case 'o':
 481                         ofname = optarg;
 482                         break;
 483                 case 'v':
 484                         version = optarg;
 485                         break;
 486                 case 'h':
 487                         usage(EXIT_SUCCESS);
 488                         break;
 489                 default:
 490                         usage(EXIT_FAILURE);
 491                         break;
 492                 }
 493         }
 494
 495         ret = check_options();
 496         if (ret)
 497                 goto out;
 498
 499         ret = build_fw();
 500
 501  out:
 502         return ret;
 503 }
 504