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_WR1043ND_V1     0x10430001
  42
  43 #define MD5SUM_LEN      16
  44
  45 struct file_info {
  46         char            *file_name;     /* name of the file */
  47         uint32_t        file_size;      /* length of the file */
  48 };
  49
  50 struct fw_header {
  51         uint32_t        version;        /* header version */
  52         char            vendor_name[24];
  53         char            fw_version[36];
  54         uint32_t        hw_id;          /* hardware id */
  55         uint32_t        hw_rev;         /* hardware revision */
  56         uint32_t        unk1;
  57         uint8_t         md5sum1[MD5SUM_LEN];
  58         uint32_t        unk2;
  59         uint8_t         md5sum2[MD5SUM_LEN];
  60         uint32_t        unk3;
  61         uint32_t        kernel_la;      /* kernel load address */
  62         uint32_t        kernel_ep;      /* kernel entry point */
  63         uint32_t        fw_length;      /* total length of the firmware */
  64         uint32_t        kernel_ofs;     /* kernel data offset */
  65         uint32_t        kernel_len;     /* kernel data length */
  66         uint32_t        rootfs_ofs;     /* rootfs data offset */
  67         uint32_t        rootfs_len;     /* rootfs data length */
  68         uint32_t        boot_ofs;       /* bootloader data offset */
  69         uint32_t        boot_len;       /* bootloader data length */
  70         uint8_t         pad[360];
  71 } __attribute__ ((packed));
  72
  73 struct board_info {
  74         char            *id;
  75         uint32_t        hw_id;
  76         uint32_t        hw_rev;
  77         uint32_t        fw_max_len;
  78         uint32_t        kernel_la;
  79         uint32_t        kernel_ep;
  80         uint32_t        rootfs_ofs;
  81 };
  82
  83 /*
  84  * Globals
  85  */
  86 static char *ofname;
  87 static char *progname;
  88 static char *vendor = "TP-LINK Technologies";
  89 static char *version = "ver. 1.0";
  90
  91 static char *board_id;
  92 static struct board_info *board;
  93 static struct file_info kernel_info;
  94 static struct file_info rootfs_info;
  95 static struct file_info boot_info;
  96 static int combined;
  97
  98 char md5salt_normal[MD5SUM_LEN] = {
  99         0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
 100         0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
 101 };
 102
 103 char md5salt_boot[MD5SUM_LEN] = {
 104         0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
 105         0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
 106 };
 107
 108 static struct board_info boards[] = {
 109         {
 110                 .id             = "TL-WR741NDv1",
 111                 .hw_id          = HWID_TL_WR741ND_V1,
 112                 .hw_rev         = 1,
 113                 .fw_max_len     = 0x3c0000,
 114                 .kernel_la      = 0x80060000,
 115                 .kernel_ep      = 0x80060000,
 116                 .rootfs_ofs     = 0x140000,
 117         }, {
 118                 .id             = "TL-WR841Nv1.5",
 119                 .hw_id          = HWID_TL_WR841N_V1_5,
 120                 .hw_rev         = 2,
 121                 .fw_max_len     = 0x3c0000,
 122                 .kernel_la      = 0x80060000,
 123                 .kernel_ep      = 0x80060000,
 124                 .rootfs_ofs     = 0x140000,
 125         }, {
 126                 .id             = "TL-WR841NDv3",
 127                 .hw_id          = HWID_TL_WR841ND_V3,
 128                 .hw_rev         = 3,
 129                 .fw_max_len     = 0x3c0000,
 130                 .kernel_la      = 0x80060000,
 131                 .kernel_ep      = 0x80060000,
 132                 .rootfs_ofs     = 0x140000,
 133         }, {
 134                 .id             = "TL-WR841NDv5",
 135                 .hw_id          = HWID_TL_WR841ND_V5,
 136                 .hw_rev         = 1,
 137                 .fw_max_len     = 0x3c0000,
 138                 .kernel_la      = 0x80060000,
 139                 .kernel_ep      = 0x80060000,
 140                 .rootfs_ofs     = 0x140000,
 141         }, {
 142                 .id             = "TL-WR941NDv2",
 143                 .hw_id          = HWID_TL_WR941ND_V2,
 144                 .hw_rev         = 2,
 145                 .fw_max_len     = 0x3c0000,
 146                 .kernel_la      = 0x80060000,
 147                 .kernel_ep      = 0x80060000,
 148                 .rootfs_ofs     = 0x140000,
 149         }, {
 150                 .id             = "TL-WR1043NDv1",
 151                 .hw_id          = HWID_TL_WR1043ND_V1,
 152                 .hw_rev         = 1,
 153                 .fw_max_len     = 0x7c0000,
 154                 .kernel_la      = 0x80060000,
 155                 .kernel_ep      = 0x80060000,
 156                 .rootfs_ofs     = 0x140000,
 157         }, {
 158                 /* terminating entry */
 159         }
 160 };
 161
 162 /*
 163  * Message macros
 164  */
 165 #define ERR(fmt, ...) do { \
 166         fflush(0); \
 167         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 168                         progname, ## __VA_ARGS__ ); \
 169 } while (0)
 170
 171 #define ERRS(fmt, ...) do { \
 172         int save = errno; \
 173         fflush(0); \
 174         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 175                         progname, ## __VA_ARGS__, strerror(save)); \
 176 } while (0)
 177
 178 #define DBG(fmt, ...) do { \
 179         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 180 } while (0)
 181
 182 static struct board_info *find_board(char *id)
 183 {
 184         struct board_info *ret;
 185         struct board_info *board;
 186
 187         ret = NULL;
 188         for (board = boards; board->id != NULL; board++){
 189                 if (strcasecmp(id, board->id) == 0) {
 190                         ret = board;
 191                         break;
 192                 }
 193         };
 194
 195         return ret;
 196 }
 197
 198 static void usage(int status)
 199 {
 200         FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
 201         struct board_info *board;
 202
 203         fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
 204         fprintf(stream,
 205 "\n"
 206 "Options:\n"
 207 "  -B <board>      create image for the board specified with <board>\n"
 208 "  -c              use combined kernel image\n"
 209 "  -k <file>       read kernel image from the file <file>\n"
 210 "  -r <file>       read rootfs image from the file <file>\n"
 211 "  -o <file>       write output to the file <file>\n"
 212 "  -v <version>    set image version to <version>\n"
 213 "  -h              show this screen\n"
 214         );
 215
 216         exit(status);
 217 }
 218
 219 static int get_md5(char *data, int size, char *md5)
 220 {
 221         MD5_CTX ctx;
 222
 223         MD5_Init(&ctx);
 224         MD5_Update(&ctx, data, size);
 225         MD5_Final(md5, &ctx);
 226 }
 227
 228 static int get_file_stat(struct file_info *fdata)
 229 {
 230         struct stat st;
 231         int res;
 232
 233         if (fdata->file_name == NULL)
 234                 return 0;
 235
 236         res = stat(fdata->file_name, &st);
 237         if (res){
 238                 ERRS("stat failed on %s", fdata->file_name);
 239                 return res;
 240         }
 241
 242         fdata->file_size = st.st_size;
 243         return 0;
 244 }
 245
 246 static int read_to_buf(struct file_info *fdata, char *buf)
 247 {
 248         FILE *f;
 249         int ret = EXIT_FAILURE;
 250
 251         f = fopen(fdata->file_name, "r");
 252         if (f == NULL) {
 253                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 254                 goto out;
 255         }
 256
 257         errno = 0;
 258         fread(buf, fdata->file_size, 1, f);
 259         if (errno != 0) {
 260                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 261                 goto out_close;
 262         }
 263
 264         ret = EXIT_SUCCESS;
 265
 266  out_close:
 267         fclose(f);
 268  out:
 269         return ret;
 270 }
 271
 272 static int check_options(void)
 273 {
 274         int ret;
 275
 276         if (board_id == NULL) {
 277                 ERR("no board specified");
 278                 return -1;
 279         }
 280
 281         board = find_board(board_id);
 282         if (board == NULL) {
 283                 ERR("unknown/unsupported board id \"%s\"", board_id);
 284                 return -1;
 285         }
 286
 287         if (kernel_info.file_name == NULL) {
 288                 ERR("no kernel image specified");
 289                 return -1;
 290         }
 291
 292         ret = get_file_stat(&kernel_info);
 293         if (ret)
 294                 return ret;
 295
 296         if (combined) {
 297                 if (kernel_info.file_size >
 298                     board->fw_max_len - sizeof(struct fw_header)) {
 299                         ERR("kernel image is too big");
 300                         return -1;
 301                 }
 302         } else {
 303                 if (kernel_info.file_size >
 304                     board->rootfs_ofs - sizeof(struct fw_header)) {
 305                         ERR("kernel image is too big");
 306                         return -1;
 307                 }
 308                 if (rootfs_info.file_name == NULL) {
 309                         ERR("no rootfs image specified");
 310                         return -1;
 311                 }
 312
 313                 ret = get_file_stat(&rootfs_info);
 314                 if (ret)
 315                         return ret;
 316
 317                 if (rootfs_info.file_size >
 318                     (board->fw_max_len - board->rootfs_ofs)) {
 319                         ERR("rootfs image is too big");
 320                         return -1;
 321                 }
 322         }
 323
 324         if (ofname == NULL) {
 325                 ERR("no output file specified");
 326                 return -1;
 327         }
 328
 329         return 0;
 330 }
 331
 332 static void fill_header(char *buf, int len)
 333 {
 334         struct fw_header *hdr = (struct fw_header *)buf;
 335
 336         memset(hdr, 0, sizeof(struct fw_header));
 337
 338         hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
 339         strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
 340         strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
 341         hdr->hw_id = HOST_TO_BE32(board->hw_id);
 342         hdr->hw_rev = HOST_TO_BE32(board->hw_rev);
 343
 344         if (boot_info.file_size == 0)
 345                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
 346         else
 347                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
 348
 349         hdr->kernel_la = HOST_TO_BE32(board->kernel_la);
 350         hdr->kernel_ep = HOST_TO_BE32(board->kernel_ep);
 351         hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
 352         hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
 353         hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
 354         if (!combined) {
 355                 hdr->rootfs_ofs = HOST_TO_BE32(board->rootfs_ofs);
 356                 hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
 357         }
 358
 359         get_md5(buf, len, hdr->md5sum1);
 360 }
 361
 362 static int write_fw(char *data, int len)
 363 {
 364         FILE *f;
 365         int ret = EXIT_FAILURE;
 366
 367         f = fopen(ofname, "w");
 368         if (f == NULL) {
 369                 ERRS("could not open \"%s\" for writing", ofname);
 370                 goto out;
 371         }
 372
 373         errno = 0;
 374         fwrite(data, len, 1, f);
 375         if (errno) {
 376                 ERRS("unable to write output file");
 377                 goto out_flush;
 378         }
 379
 380         DBG("firmware file \"%s\" completed", ofname);
 381
 382         ret = EXIT_SUCCESS;
 383
 384  out_flush:
 385         fflush(f);
 386         fclose(f);
 387         if (ret != EXIT_SUCCESS) {
 388                 unlink(ofname);
 389         }
 390  out:
 391         return ret;
 392 }
 393
 394 static int build_fw(void)
 395 {
 396         int buflen;
 397         char *buf;
 398         char *p;
 399         int ret = EXIT_FAILURE;
 400
 401         buflen = board->fw_max_len;
 402
 403         buf = malloc(buflen);
 404         if (!buf) {
 405                 ERR("no memory for buffer\n");
 406                 goto out;
 407         }
 408
 409         memset(buf, 0xff, buflen);
 410         p = buf + sizeof(struct fw_header);
 411         ret = read_to_buf(&kernel_info, p);
 412         if (ret)
 413                 goto out_free_buf;
 414
 415         if (!combined) {
 416                 p = buf + board->rootfs_ofs;
 417                 ret = read_to_buf(&rootfs_info, p);
 418                 if (ret)
 419                         goto out_free_buf;
 420         }
 421
 422         fill_header(buf, buflen);
 423
 424         ret = write_fw(buf, buflen);
 425         if (ret)
 426                 goto out_free_buf;
 427
 428         ret = EXIT_SUCCESS;
 429
 430  out_free_buf:
 431         free(buf);
 432  out:
 433         return ret;
 434 }
 435
 436 int main(int argc, char *argv[])
 437 {
 438         int ret = EXIT_FAILURE;
 439         int err;
 440
 441         FILE *outfile;
 442
 443         progname = basename(argv[0]);
 444
 445         while ( 1 ) {
 446                 int c;
 447
 448                 c = getopt(argc, argv, "B:V:N:ck:r:o:v:h:");
 449                 if (c == -1)
 450                         break;
 451
 452                 switch (c) {
 453                 case 'B':
 454                         board_id = optarg;
 455                         break;
 456                 case 'V':
 457                         version = optarg;
 458                         break;
 459                 case 'N':
 460                         vendor = optarg;
 461                         break;
 462                 case 'c':
 463                         combined++;
 464                         break;
 465                 case 'k':
 466                         kernel_info.file_name = optarg;
 467                         break;
 468                 case 'r':
 469                         rootfs_info.file_name = optarg;
 470                         break;
 471                 case 'o':
 472                         ofname = optarg;
 473                         break;
 474                 case 'v':
 475                         version = optarg;
 476                         break;
 477                 case 'h':
 478                         usage(EXIT_SUCCESS);
 479                         break;
 480                 default:
 481                         usage(EXIT_FAILURE);
 482                         break;
 483                 }
 484         }
 485
 486         ret = check_options();
 487         if (ret)
 488                 goto out;
 489
 490         ret = build_fw();
 491
 492  out:
 493         return ret;
 494 }
 495