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_WR841ND_V3      0x08410003
  38 #define HWID_TL_WR841ND_V5      0x08410005
  39 #define HWID_TL_WR941ND_V2      0x09410002
  40 #define HWID_TL_WR1043ND_V1    0x10430001
  41
  42 #define MD5SUM_LEN      16
  43
  44 struct file_info {
  45         char            *file_name;     /* name of the file */
  46         uint32_t        file_size;      /* length of the file */
  47 };
  48
  49 struct fw_header {
  50         uint32_t        version;        /* header version */
  51         char            vendor_name[24];
  52         char            fw_version[36];
  53         uint32_t        hw_id;          /* hardware id */
  54         uint32_t        hw_rev;         /* hardware revision */
  55         uint32_t        unk1;
  56         uint8_t         md5sum1[MD5SUM_LEN];
  57         uint32_t        unk2;
  58         uint8_t         md5sum2[MD5SUM_LEN];
  59         uint32_t        unk3;
  60         uint32_t        kernel_la;      /* kernel load address */
  61         uint32_t        kernel_ep;      /* kernel entry point */
  62         uint32_t        fw_length;      /* total length of the firmware */
  63         uint32_t        kernel_ofs;     /* kernel data offset */
  64         uint32_t        kernel_len;     /* kernel data length */
  65         uint32_t        rootfs_ofs;     /* rootfs data offset */
  66         uint32_t        rootfs_len;     /* rootfs data length */
  67         uint32_t        boot_ofs;       /* bootloader data offset */
  68         uint32_t        boot_len;       /* bootloader data length */
  69         uint8_t         pad[360];
  70 } __attribute__ ((packed));
  71
  72 struct board_info {
  73         char            *id;
  74         uint32_t        hw_id;
  75         uint32_t        hw_rev;
  76         uint32_t        fw_max_len;
  77         uint32_t        kernel_la;
  78         uint32_t        kernel_ep;
  79         uint32_t        rootfs_ofs;
  80 };
  81
  82 /*
  83  * Globals
  84  */
  85 static char *ofname;
  86 static char *progname;
  87 static char *vendor = "TP-LINK Technologies";
  88 static char *version = "ver. 1.0";
  89
  90 static char *board_id;
  91 static struct board_info *board;
  92 static struct file_info kernel_info;
  93 static struct file_info rootfs_info;
  94 static struct file_info boot_info;
  95 static int combined;
  96
  97 char md5salt_normal[MD5SUM_LEN] = {
  98         0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
  99         0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
 100 };
 101
 102 char md5salt_boot[MD5SUM_LEN] = {
 103         0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
 104         0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
 105 };
 106
 107 static struct board_info boards[] = {
 108         {
 109                 .id             = "TL-WR741NDv1",
 110                 .hw_id          = HWID_TL_WR741ND_V1,
 111                 .hw_rev         = 1,
 112                 .fw_max_len     = 0x3c0000,
 113                 .kernel_la      = 0x80060000,
 114                 .kernel_ep      = 0x80060000,
 115                 .rootfs_ofs     = 0x140000,
 116         }, {
 117                 .id             = "TL-WR841NDv3",
 118                 .hw_id          = HWID_TL_WR841ND_V3,
 119                 .hw_rev         = 3,
 120                 .fw_max_len     = 0x3c0000,
 121                 .kernel_la      = 0x80060000,
 122                 .kernel_ep      = 0x80060000,
 123                 .rootfs_ofs     = 0x140000,
 124         }, {
 125                 .id             = "TL-WR841NDv5",
 126                 .hw_id          = HWID_TL_WR841ND_V5,
 127                 .hw_rev         = 1,
 128                 .fw_max_len     = 0x3c0000,
 129                 .kernel_la      = 0x80060000,
 130                 .kernel_ep      = 0x80060000,
 131                 .rootfs_ofs     = 0x140000,
 132         }, {
 133                 .id             = "TL-WR941NDv2",
 134                 .hw_id          = HWID_TL_WR941ND_V2,
 135                 .hw_rev         = 2,
 136                 .fw_max_len     = 0x3c0000,
 137                 .kernel_la      = 0x80060000,
 138                 .kernel_ep      = 0x80060000,
 139                 .rootfs_ofs     = 0x140000,
 140         }, {
 141                 .id             = "TL-WR1043NDv1",
 142                 .hw_id          = HWID_TL_WR1043ND_V1,
 143                 .hw_rev         = 1,
 144                 .fw_max_len     = 0x7c0000,
 145                 .kernel_la      = 0x80060000,
 146                 .kernel_ep      = 0x80060000,
 147                 .rootfs_ofs     = 0x140000,
 148         }, {
 149                 /* terminating entry */
 150         }
 151 };
 152
 153 /*
 154  * Message macros
 155  */
 156 #define ERR(fmt, ...) do { \
 157         fflush(0); \
 158         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 159                         progname, ## __VA_ARGS__ ); \
 160 } while (0)
 161
 162 #define ERRS(fmt, ...) do { \
 163         int save = errno; \
 164         fflush(0); \
 165         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 166                         progname, ## __VA_ARGS__, strerror(save)); \
 167 } while (0)
 168
 169 #define DBG(fmt, ...) do { \
 170         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 171 } while (0)
 172
 173 static struct board_info *find_board(char *id)
 174 {
 175         struct board_info *ret;
 176         struct board_info *board;
 177
 178         ret = NULL;
 179         for (board = boards; board->id != NULL; board++){
 180                 if (strcasecmp(id, board->id) == 0) {
 181                         ret = board;
 182                         break;
 183                 }
 184         };
 185
 186         return ret;
 187 }
 188
 189 static void usage(int status)
 190 {
 191         FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
 192         struct board_info *board;
 193
 194         fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
 195         fprintf(stream,
 196 "\n"
 197 "Options:\n"
 198 "  -B <board>      create image for the board specified with <board>\n"
 199 "  -c              use combined kernel image\n"
 200 "  -k <file>       read kernel image from the file <file>\n"
 201 "  -r <file>       read rootfs image from the file <file>\n"
 202 "  -o <file>       write output to the file <file>\n"
 203 "  -v <version>    set image version to <version>\n"
 204 "  -h              show this screen\n"
 205         );
 206
 207         exit(status);
 208 }
 209
 210 static int get_md5(char *data, int size, char *md5)
 211 {
 212         MD5_CTX ctx;
 213
 214         MD5_Init(&ctx);
 215         MD5_Update(&ctx, data, size);
 216         MD5_Final(md5, &ctx);
 217 }
 218
 219 static int get_file_stat(struct file_info *fdata)
 220 {
 221         struct stat st;
 222         int res;
 223
 224         if (fdata->file_name == NULL)
 225                 return 0;
 226
 227         res = stat(fdata->file_name, &st);
 228         if (res){
 229                 ERRS("stat failed on %s", fdata->file_name);
 230                 return res;
 231         }
 232
 233         fdata->file_size = st.st_size;
 234         return 0;
 235 }
 236
 237 static int read_to_buf(struct file_info *fdata, char *buf)
 238 {
 239         FILE *f;
 240         int ret = EXIT_FAILURE;
 241
 242         f = fopen(fdata->file_name, "r");
 243         if (f == NULL) {
 244                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 245                 goto out;
 246         }
 247
 248         errno = 0;
 249         fread(buf, fdata->file_size, 1, f);
 250         if (errno != 0) {
 251                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 252                 goto out_close;
 253         }
 254
 255         ret = EXIT_SUCCESS;
 256
 257  out_close:
 258         fclose(f);
 259  out:
 260         return ret;
 261 }
 262
 263 static int check_options(void)
 264 {
 265         int ret;
 266
 267         if (board_id == NULL) {
 268                 ERR("no board specified");
 269                 return -1;
 270         }
 271
 272         board = find_board(board_id);
 273         if (board == NULL) {
 274                 ERR("unknown/unsupported board id \"%s\"", board_id);
 275                 return -1;
 276         }
 277
 278         if (kernel_info.file_name == NULL) {
 279                 ERR("no kernel image specified");
 280                 return -1;
 281         }
 282
 283         ret = get_file_stat(&kernel_info);
 284         if (ret)
 285                 return ret;
 286
 287         if (combined) {
 288                 if (kernel_info.file_size >
 289                     board->fw_max_len - sizeof(struct fw_header)) {
 290                         ERR("kernel image is too big");
 291                         return -1;
 292                 }
 293         } else {
 294                 if (kernel_info.file_size >
 295                     board->rootfs_ofs - sizeof(struct fw_header)) {
 296                         ERR("kernel image is too big");
 297                         return -1;
 298                 }
 299                 if (rootfs_info.file_name == NULL) {
 300                         ERR("no rootfs image specified");
 301                         return -1;
 302                 }
 303
 304                 ret = get_file_stat(&rootfs_info);
 305                 if (ret)
 306                         return ret;
 307
 308                 if (rootfs_info.file_size >
 309                     (board->fw_max_len - board->rootfs_ofs)) {
 310                         ERR("rootfs image is too big");
 311                         return -1;
 312                 }
 313         }
 314
 315         if (ofname == NULL) {
 316                 ERR("no output file specified");
 317                 return -1;
 318         }
 319
 320         return 0;
 321 }
 322
 323 static void fill_header(char *buf, int len)
 324 {
 325         struct fw_header *hdr = (struct fw_header *)buf;
 326
 327         memset(hdr, 0, sizeof(struct fw_header));
 328
 329         hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
 330         strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
 331         strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
 332         hdr->hw_id = HOST_TO_BE32(board->hw_id);
 333         hdr->hw_rev = HOST_TO_BE32(board->hw_rev);
 334
 335         if (boot_info.file_size == 0)
 336                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
 337         else
 338                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
 339
 340         hdr->kernel_la = HOST_TO_BE32(board->kernel_la);
 341         hdr->kernel_ep = HOST_TO_BE32(board->kernel_ep);
 342         hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
 343         hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
 344         hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
 345         if (!combined) {
 346                 hdr->rootfs_ofs = HOST_TO_BE32(board->rootfs_ofs);
 347                 hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
 348         }
 349
 350         get_md5(buf, len, hdr->md5sum1);
 351 }
 352
 353 static int write_fw(char *data, int len)
 354 {
 355         FILE *f;
 356         int ret = EXIT_FAILURE;
 357
 358         f = fopen(ofname, "w");
 359         if (f == NULL) {
 360                 ERRS("could not open \"%s\" for writing", ofname);
 361                 goto out;
 362         }
 363
 364         errno = 0;
 365         fwrite(data, len, 1, f);
 366         if (errno) {
 367                 ERRS("unable to write output file");
 368                 goto out_flush;
 369         }
 370
 371         DBG("firmware file \"%s\" completed", ofname);
 372
 373         ret = EXIT_SUCCESS;
 374
 375  out_flush:
 376         fflush(f);
 377         fclose(f);
 378         if (ret != EXIT_SUCCESS) {
 379                 unlink(ofname);
 380         }
 381  out:
 382         return ret;
 383 }
 384
 385 static int build_fw(void)
 386 {
 387         int buflen;
 388         char *buf;
 389         char *p;
 390         int ret = EXIT_FAILURE;
 391
 392         buflen = board->fw_max_len;
 393
 394         buf = malloc(buflen);
 395         if (!buf) {
 396                 ERR("no memory for buffer\n");
 397                 goto out;
 398         }
 399
 400         memset(buf, 0xff, buflen);
 401         p = buf + sizeof(struct fw_header);
 402         ret = read_to_buf(&kernel_info, p);
 403         if (ret)
 404                 goto out_free_buf;
 405
 406         if (!combined) {
 407                 p = buf + board->rootfs_ofs;
 408                 ret = read_to_buf(&rootfs_info, p);
 409                 if (ret)
 410                         goto out_free_buf;
 411         }
 412
 413         fill_header(buf, buflen);
 414
 415         ret = write_fw(buf, buflen);
 416         if (ret)
 417                 goto out_free_buf;
 418
 419         ret = EXIT_SUCCESS;
 420
 421  out_free_buf:
 422         free(buf);
 423  out:
 424         return ret;
 425 }
 426
 427 int main(int argc, char *argv[])
 428 {
 429         int ret = EXIT_FAILURE;
 430         int err;
 431
 432         FILE *outfile;
 433
 434         progname = basename(argv[0]);
 435
 436         while ( 1 ) {
 437                 int c;
 438
 439                 c = getopt(argc, argv, "B:V:N:ck:r:o:v:h:");
 440                 if (c == -1)
 441                         break;
 442
 443                 switch (c) {
 444                 case 'B':
 445                         board_id = optarg;
 446                         break;
 447                 case 'V':
 448                         version = optarg;
 449                         break;
 450                 case 'N':
 451                         vendor = optarg;
 452                         break;
 453                 case 'c':
 454                         combined++;
 455                         break;
 456                 case 'k':
 457                         kernel_info.file_name = optarg;
 458                         break;
 459                 case 'r':
 460                         rootfs_info.file_name = optarg;
 461                         break;
 462                 case 'o':
 463                         ofname = optarg;
 464                         break;
 465                 case 'v':
 466                         version = optarg;
 467                         break;
 468                 case 'h':
 469                         usage(EXIT_SUCCESS);
 470                         break;
 471                 default:
 472                         usage(EXIT_FAILURE);
 473                         break;
 474                 }
 475         }
 476
 477         ret = check_options();
 478         if (ret)
 479                 goto out;
 480
 481         ret = build_fw();
 482
 483  out:
 484         return ret;
 485 }
 486