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_WR941ND_V2      0x09410002
  39
  40 #define MD5SUM_LEN      16
  41
  42 struct file_info {
  43         char            *file_name;     /* name of the file */
  44         uint32_t        file_size;      /* length of the file */
  45 };
  46
  47 struct fw_header {
  48         uint32_t        version;        /* header version */
  49         char            vendor_name[24];
  50         char            fw_version[36];
  51         uint32_t        hw_id;          /* hardware id */
  52         uint32_t        hw_rev;         /* hardware revision */
  53         uint32_t        unk1;
  54         uint8_t         md5sum1[MD5SUM_LEN];
  55         uint32_t        unk2;
  56         uint8_t         md5sum2[MD5SUM_LEN];
  57         uint32_t        unk3;
  58         uint32_t        kernel_la;      /* kernel load address */
  59         uint32_t        kernel_ep;      /* kernel entry point */
  60         uint32_t        fw_length;      /* total length of the firmware */
  61         uint32_t        kernel_ofs;     /* kernel data offset */
  62         uint32_t        kernel_len;     /* kernel data length */
  63         uint32_t        rootfs_ofs;     /* rootfs data offset */
  64         uint32_t        rootfs_len;     /* rootfs data length */
  65         uint32_t        boot_ofs;       /* bootloader data offset */
  66         uint32_t        boot_len;       /* bootloader data length */
  67         uint8_t         pad[360];
  68 } __attribute__ ((packed));
  69
  70 struct board_info {
  71         char            *id;
  72         uint32_t        hw_id;
  73         uint32_t        hw_rev;
  74         uint32_t        fw_max_len;
  75         uint32_t        kernel_la;
  76         uint32_t        kernel_ep;
  77         uint32_t        rootfs_ofs;
  78 };
  79
  80 /*
  81  * Globals
  82  */
  83 static char *ofname;
  84 static char *progname;
  85 static char *vendor = "TP-LINK Technologies";
  86 static char *version = "ver. 1.0";
  87
  88 static char *board_id;
  89 static struct board_info *board;
  90 static struct file_info kernel_info;
  91 static struct file_info rootfs_info;
  92 static struct file_info boot_info;
  93
  94 char md5salt_normal[MD5SUM_LEN] = {
  95         0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
  96         0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
  97 };
  98
  99 char md5salt_boot[MD5SUM_LEN] = {
 100         0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
 101         0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
 102 };
 103
 104 static struct board_info boards[] = {
 105         {
 106                 .id             = "TL-WR741NDv1",
 107                 .hw_id          = HWID_TL_WR741ND_V1,
 108                 .hw_rev         = 1,
 109                 .fw_max_len     = 0x3c0000,
 110                 .kernel_la      = 0x80060000,
 111                 .kernel_ep      = 0x80060000,
 112                 .rootfs_ofs     = 0x120000,
 113         }, {
 114                 .id             = "TL-WR841NDv3",
 115                 .hw_id          = HWID_TL_WR841ND_V3,
 116                 .hw_rev         = 3,
 117                 .fw_max_len     = 0x3c0000,
 118                 .kernel_la      = 0x80060000,
 119                 .kernel_ep      = 0x80060000,
 120                 .rootfs_ofs     = 0x120000,
 121         }, {
 122                 .id             = "TL-WR941NDv2",
 123                 .hw_id          = HWID_TL_WR941ND_V2,
 124                 .hw_rev         = 2,
 125                 .fw_max_len     = 0x3c0000,
 126                 .kernel_la      = 0x80060000,
 127                 .kernel_ep      = 0x80060000,
 128                 .rootfs_ofs     = 0x120000,
 129         }, {
 130                 /* terminating entry */
 131         }
 132 };
 133
 134 /*
 135  * Message macros
 136  */
 137 #define ERR(fmt, ...) do { \
 138         fflush(0); \
 139         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 140                         progname, ## __VA_ARGS__ ); \
 141 } while (0)
 142
 143 #define ERRS(fmt, ...) do { \
 144         int save = errno; \
 145         fflush(0); \
 146         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 147                         progname, ## __VA_ARGS__, strerror(save)); \
 148 } while (0)
 149
 150 #define DBG(fmt, ...) do { \
 151         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 152 } while (0)
 153
 154 static struct board_info *find_board(char *id)
 155 {
 156         struct board_info *ret;
 157         struct board_info *board;
 158
 159         ret = NULL;
 160         for (board = boards; board->id != NULL; board++){
 161                 if (strcasecmp(id, board->id) == 0) {
 162                         ret = board;
 163                         break;
 164                 }
 165         };
 166
 167         return ret;
 168 }
 169
 170 static void usage(int status)
 171 {
 172         FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
 173         struct board_info *board;
 174
 175         fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
 176         fprintf(stream,
 177 "\n"
 178 "Options:\n"
 179 "  -B <board>      create image for the board specified with <board>\n"
 180 "  -k <file>       read kernel image from the file <file>\n"
 181 "  -r <file>       read rootfs image from the file <file>\n"
 182 "  -o <file>       write output to the file <file>\n"
 183 "  -v <version>    set image version to <version>\n"
 184 "  -h              show this screen\n"
 185         );
 186
 187         exit(status);
 188 }
 189
 190 static int get_md5(char *data, int size, char *md5)
 191 {
 192         MD5_CTX ctx;
 193
 194         MD5_Init(&ctx);
 195         MD5_Update(&ctx, data, size);
 196         MD5_Final(md5, &ctx);
 197 }
 198
 199 static int get_file_stat(struct file_info *fdata)
 200 {
 201         struct stat st;
 202         int res;
 203
 204         if (fdata->file_name == NULL)
 205                 return 0;
 206
 207         res = stat(fdata->file_name, &st);
 208         if (res){
 209                 ERRS("stat failed on %s", fdata->file_name);
 210                 return res;
 211         }
 212
 213         fdata->file_size = st.st_size;
 214         return 0;
 215 }
 216
 217 static int read_to_buf(struct file_info *fdata, char *buf)
 218 {
 219         FILE *f;
 220         int ret = EXIT_FAILURE;
 221
 222         f = fopen(fdata->file_name, "r");
 223         if (f == NULL) {
 224                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 225                 goto out;
 226         }
 227
 228         errno = 0;
 229         fread(buf, fdata->file_size, 1, f);
 230         if (errno != 0) {
 231                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 232                 goto out_close;
 233         }
 234
 235         ret = EXIT_SUCCESS;
 236
 237  out_close:
 238         fclose(f);
 239  out:
 240         return ret;
 241 }
 242
 243 static int check_options(void)
 244 {
 245         int ret;
 246
 247         if (board_id == NULL) {
 248                 ERR("no board specified");
 249                 return -1;
 250         }
 251
 252         board = find_board(board_id);
 253         if (board == NULL) {
 254                 ERR("unknown/unsupported board id \"%s\"", board_id);
 255                 return -1;
 256         }
 257
 258         if (kernel_info.file_name == NULL) {
 259                 ERR("no kernel image specified");
 260                 return -1;
 261         }
 262
 263         ret = get_file_stat(&kernel_info);
 264         if (ret)
 265                 return ret;
 266
 267         if (kernel_info.file_size > board->rootfs_ofs - sizeof(struct fw_header)) {
 268                 ERR("kernel image is too big");
 269                 return -1;
 270         }
 271
 272         if (rootfs_info.file_name == NULL) {
 273                 ERR("no rootfs image specified");
 274                 return -1;
 275         }
 276
 277         ret = get_file_stat(&rootfs_info);
 278         if (ret)
 279                 return ret;
 280
 281         if (rootfs_info.file_size > (board->fw_max_len - board->rootfs_ofs)) {
 282                 ERR("rootfs image is too big");
 283                 return -1;
 284         }
 285
 286         if (ofname == NULL) {
 287                 ERR("no output file specified");
 288                 return -1;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void fill_header(char *buf, int len)
 295 {
 296         struct fw_header *hdr = (struct fw_header *)buf;
 297
 298         memset(hdr, 0, sizeof(struct fw_header));
 299
 300         hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
 301         strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
 302         strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
 303         hdr->hw_id = HOST_TO_BE32(board->hw_id);
 304         hdr->hw_rev = HOST_TO_BE32(board->hw_rev);
 305
 306         if (boot_info.file_size == 0)
 307                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
 308         else
 309                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
 310
 311         hdr->kernel_la = HOST_TO_BE32(board->kernel_la);
 312         hdr->kernel_ep = HOST_TO_BE32(board->kernel_ep);
 313         hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
 314         hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
 315         hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
 316         hdr->rootfs_ofs = HOST_TO_BE32(board->rootfs_ofs);
 317         hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
 318
 319         get_md5(buf, len, hdr->md5sum1);
 320 }
 321
 322 static int write_fw(char *data, int len)
 323 {
 324         FILE *f;
 325         int ret = EXIT_FAILURE;
 326
 327         f = fopen(ofname, "w");
 328         if (f == NULL) {
 329                 ERRS("could not open \"%s\" for writing", ofname);
 330                 goto out;
 331         }
 332
 333         errno = 0;
 334         fwrite(data, len, 1, f);
 335         if (errno) {
 336                 ERRS("unable to write output file");
 337                 goto out_flush;
 338         }
 339
 340         DBG("firmware file \"%s\" completed", ofname);
 341
 342         ret = EXIT_SUCCESS;
 343
 344  out_flush:
 345         fflush(f);
 346         fclose(f);
 347         if (ret != EXIT_SUCCESS) {
 348                 unlink(ofname);
 349         }
 350  out:
 351         return ret;
 352 }
 353
 354 static int build_fw(void)
 355 {
 356         int buflen;
 357         char *buf;
 358         char *p;
 359         int ret = EXIT_FAILURE;
 360
 361         buflen = board->fw_max_len;
 362
 363         buf = malloc(buflen);
 364         if (!buf) {
 365                 ERR("no memory for buffer\n");
 366                 goto out;
 367         }
 368
 369         memset(buf, 0xff, buflen);
 370         p = buf + sizeof(struct fw_header);
 371         ret = read_to_buf(&kernel_info, p);
 372         if (ret)
 373                 goto out_free_buf;
 374
 375         p = buf + board->rootfs_ofs;
 376         ret = read_to_buf(&rootfs_info, p);
 377         if (ret)
 378                 goto out_free_buf;
 379
 380         fill_header(buf, buflen);
 381
 382         ret = write_fw(buf, buflen);
 383         if (ret)
 384                 goto out_free_buf;
 385
 386         ret = EXIT_SUCCESS;
 387
 388  out_free_buf:
 389         free(buf);
 390  out:
 391         return ret;
 392 }
 393
 394 int main(int argc, char *argv[])
 395 {
 396         int ret = EXIT_FAILURE;
 397         int err;
 398
 399         FILE *outfile;
 400
 401         progname = basename(argv[0]);
 402
 403         while ( 1 ) {
 404                 int c;
 405
 406                 c = getopt(argc, argv, "B:V:N:k:r:o:v:h:");
 407                 if (c == -1)
 408                         break;
 409
 410                 switch (c) {
 411                 case 'B':
 412                         board_id = optarg;
 413                         break;
 414                 case 'V':
 415                         version = optarg;
 416                         break;
 417                 case 'N':
 418                         vendor = optarg;
 419                         break;
 420                 case 'k':
 421                         kernel_info.file_name = optarg;
 422                         break;
 423                 case 'r':
 424                         rootfs_info.file_name = optarg;
 425                         break;
 426                 case 'o':
 427                         ofname = optarg;
 428                         break;
 429                 case 'v':
 430                         version = optarg;
 431                         break;
 432                 case 'h':
 433                         usage(EXIT_SUCCESS);
 434                         break;
 435                 default:
 436                         usage(EXIT_FAILURE);
 437                         break;
 438                 }
 439         }
 440
 441         ret = check_options();
 442         if (ret)
 443                 goto out;
 444
 445         ret = build_fw();
 446
 447  out:
 448         return ret;
 449 }
 450