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