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_WR941ND_V2      0x09410002
  37
  38 #define MD5SUM_LEN      16
  39
  40 struct file_info {
  41         char            *file_name;     /* name of the file */
  42         uint32_t        file_size;      /* length of the file */
  43 };
  44
  45 struct fw_header {
  46         uint32_t        version;        /* header version */
  47         char            vendor_name[24];
  48         char            fw_version[36];
  49         uint32_t        hw_id;          /* hardware id */
  50         uint32_t        hw_rev;         /* hardware revision */
  51         uint32_t        unk1;
  52         uint8_t         md5sum1[MD5SUM_LEN];
  53         uint32_t        unk2;
  54         uint8_t         md5sum2[MD5SUM_LEN];
  55         uint32_t        unk3;
  56         uint32_t        kernel_la;      /* kernel load address */
  57         uint32_t        kernel_ep;      /* kernel entry point */
  58         uint32_t        fw_length;      /* total length of the firmware */
  59         uint32_t        kernel_ofs;     /* kernel data offset */
  60         uint32_t        kernel_len;     /* kernel data length */
  61         uint32_t        rootfs_ofs;     /* rootfs data offset */
  62         uint32_t        rootfs_len;     /* rootfs data length */
  63         uint32_t        boot_ofs;       /* bootloader data offset */
  64         uint32_t        boot_len;       /* bootloader data length */
  65         uint8_t         pad[360];
  66 } __attribute__ ((packed));
  67
  68 struct board_info {
  69         char            *id;
  70         uint32_t        hw_id;
  71         uint32_t        hw_rev;
  72         uint32_t        fw_max_len;
  73         uint32_t        kernel_la;
  74         uint32_t        kernel_ep;
  75         uint32_t        rootfs_ofs;
  76 };
  77
  78 /*
  79  * Globals
  80  */
  81 static char *ofname;
  82 static char *progname;
  83 static char *vendor = "TP-LINK Technologies";
  84 static char *version = "ver. 1.0";
  85
  86 static char *board_id;
  87 static struct board_info *board;
  88 static struct file_info kernel_info;
  89 static struct file_info rootfs_info;
  90 static struct file_info boot_info;
  91
  92 char md5salt_normal[MD5SUM_LEN] = {
  93         0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
  94         0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
  95 };
  96
  97 char md5salt_boot[MD5SUM_LEN] = {
  98         0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
  99         0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
 100 };
 101
 102 static struct board_info boards[] = {
 103         {
 104                 .id             = "TL-WR941NDv2",
 105                 .hw_id          = HWID_TL_WR941ND_V2,
 106                 .hw_rev         = 2,
 107                 .fw_max_len     = 0x3c0000,
 108                 .kernel_la      = 0x80060000,
 109                 .kernel_ep      = 0x80060000,
 110                 .rootfs_ofs     = 0x120000,
 111         }, {
 112                 /* terminating entry */
 113         }
 114 };
 115
 116 /*
 117  * Message macros
 118  */
 119 #define ERR(fmt, ...) do { \
 120         fflush(0); \
 121         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 122                         progname, ## __VA_ARGS__ ); \
 123 } while (0)
 124
 125 #define ERRS(fmt, ...) do { \
 126         int save = errno; \
 127         fflush(0); \
 128         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 129                         progname, ## __VA_ARGS__, strerror(save)); \
 130 } while (0)
 131
 132 #define DBG(fmt, ...) do { \
 133         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 134 } while (0)
 135
 136 static struct board_info *find_board(char *id)
 137 {
 138         struct board_info *ret;
 139         struct board_info *board;
 140
 141         ret = NULL;
 142         for (board = boards; board->id != NULL; board++){
 143                 if (strcasecmp(id, board->id) == 0) {
 144                         ret = board;
 145                         break;
 146                 }
 147         };
 148
 149         return ret;
 150 }
 151
 152 static void usage(int status)
 153 {
 154         FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
 155         struct board_info *board;
 156
 157         fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
 158         fprintf(stream,
 159 "\n"
 160 "Options:\n"
 161 "  -B <board>      create image for the board specified with <board>\n"
 162 "  -k <file>       read kernel image from the file <file>\n"
 163 "  -r <file>       read rootfs image from the file <file>\n"
 164 "  -o <file>       write output to the file <file>\n"
 165 "  -v <version>    set image version to <version>\n"
 166 "  -h              show this screen\n"
 167         );
 168
 169         exit(status);
 170 }
 171
 172 static int get_md5(char *data, int size, char *md5)
 173 {
 174         MD5_CTX ctx;
 175
 176         MD5_Init(&ctx);
 177         MD5_Update(&ctx, data, size);
 178         MD5_Final(md5, &ctx);
 179 }
 180
 181 static int get_file_stat(struct file_info *fdata)
 182 {
 183         struct stat st;
 184         int res;
 185
 186         if (fdata->file_name == NULL)
 187                 return 0;
 188
 189         res = stat(fdata->file_name, &st);
 190         if (res){
 191                 ERRS("stat failed on %s", fdata->file_name);
 192                 return res;
 193         }
 194
 195         fdata->file_size = st.st_size;
 196         return 0;
 197 }
 198
 199 static int read_to_buf(struct file_info *fdata, char *buf)
 200 {
 201         FILE *f;
 202         int ret = EXIT_FAILURE;
 203
 204         f = fopen(fdata->file_name, "r");
 205         if (f == NULL) {
 206                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 207                 goto out;
 208         }
 209
 210         errno = 0;
 211         fread(buf, fdata->file_size, 1, f);
 212         if (errno != 0) {
 213                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 214                 goto out_close;
 215         }
 216
 217         ret = EXIT_SUCCESS;
 218
 219  out_close:
 220         fclose(f);
 221  out:
 222         return ret;
 223 }
 224
 225 static int check_options(void)
 226 {
 227         int ret;
 228
 229         if (board_id == NULL) {
 230                 ERR("no board specified");
 231                 return -1;
 232         }
 233
 234         board = find_board(board_id);
 235         if (board == NULL) {
 236                 ERR("unknown/unsupported board id \"%s\"", board_id);
 237                 return -1;
 238         }
 239
 240         if (kernel_info.file_name == NULL) {
 241                 ERR("no kernel image specified");
 242                 return -1;
 243         }
 244
 245         ret = get_file_stat(&kernel_info);
 246         if (ret)
 247                 return ret;
 248
 249         if (kernel_info.file_size > board->rootfs_ofs - sizeof(struct fw_header)) {
 250                 ERR("kernel image is too big");
 251                 return -1;
 252         }
 253
 254         if (rootfs_info.file_name == NULL) {
 255                 ERR("no rootfs image specified");
 256                 return -1;
 257         }
 258
 259         ret = get_file_stat(&rootfs_info);
 260         if (ret)
 261                 return ret;
 262
 263         if (rootfs_info.file_size > (board->fw_max_len - board->rootfs_ofs)) {
 264                 ERR("rootfs image is too big");
 265                 return -1;
 266         }
 267
 268         if (ofname == NULL) {
 269                 ERR("no output file specified");
 270                 return -1;
 271         }
 272
 273         return 0;
 274 }
 275
 276 static void fill_header(char *buf, int len)
 277 {
 278         struct fw_header *hdr = (struct fw_header *)buf;
 279
 280         memset(hdr, 0, sizeof(struct fw_header));
 281
 282         hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
 283         strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
 284         strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
 285         hdr->hw_id = HOST_TO_BE32(board->hw_id);
 286         hdr->hw_rev = HOST_TO_BE32(board->hw_rev);
 287
 288         if (boot_info.file_size == 0)
 289                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
 290         else
 291                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
 292
 293         hdr->kernel_la = HOST_TO_BE32(board->kernel_la);
 294         hdr->kernel_ep = HOST_TO_BE32(board->kernel_ep);
 295         hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
 296         hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
 297         hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
 298         hdr->rootfs_ofs = HOST_TO_BE32(board->rootfs_ofs);
 299         hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
 300
 301         get_md5(buf, len, hdr->md5sum1);
 302 }
 303
 304 static int write_fw(char *data, int len)
 305 {
 306         FILE *f;
 307         int ret = EXIT_FAILURE;
 308
 309         f = fopen(ofname, "w");
 310         if (f == NULL) {
 311                 ERRS("could not open \"%s\" for writing", ofname);
 312                 goto out;
 313         }
 314
 315         errno = 0;
 316         fwrite(data, len, 1, f);
 317         if (errno) {
 318                 ERRS("unable to write output file");
 319                 goto out_flush;
 320         }
 321
 322         DBG("firmware file \"%s\" completed", ofname);
 323
 324         ret = EXIT_SUCCESS;
 325
 326  out_flush:
 327         fflush(f);
 328         fclose(f);
 329         if (ret != EXIT_SUCCESS) {
 330                 unlink(ofname);
 331         }
 332  out:
 333         return ret;
 334 }
 335
 336 static int build_fw(void)
 337 {
 338         int buflen;
 339         char *buf;
 340         char *p;
 341         int ret = EXIT_FAILURE;
 342
 343         buflen = board->fw_max_len;
 344
 345         buf = malloc(buflen);
 346         if (!buf) {
 347                 ERR("no memory for buffer\n");
 348                 goto out;
 349         }
 350
 351         memset(buf, 0xff, buflen);
 352         p = buf + sizeof(struct fw_header);
 353         ret = read_to_buf(&kernel_info, p);
 354         if (ret)
 355                 goto out_free_buf;
 356
 357         p = buf + board->rootfs_ofs;
 358         ret = read_to_buf(&rootfs_info, p);
 359         if (ret)
 360                 goto out_free_buf;
 361
 362         fill_header(buf, buflen);
 363
 364         ret = write_fw(buf, buflen);
 365         if (ret)
 366                 goto out_free_buf;
 367
 368         ret = EXIT_SUCCESS;
 369
 370  out_free_buf:
 371         free(buf);
 372  out:
 373         return ret;
 374 }
 375
 376 int main(int argc, char *argv[])
 377 {
 378         int ret = EXIT_FAILURE;
 379         int err;
 380
 381         FILE *outfile;
 382
 383         progname = basename(argv[0]);
 384
 385         while ( 1 ) {
 386                 int c;
 387
 388                 c = getopt(argc, argv, "B:V:N:k:r:o:v:h:");
 389                 if (c == -1)
 390                         break;
 391
 392                 switch (c) {
 393                 case 'B':
 394                         board_id = optarg;
 395                         break;
 396                 case 'V':
 397                         version = optarg;
 398                         break;
 399                 case 'N':
 400                         vendor = optarg;
 401                         break;
 402                 case 'k':
 403                         kernel_info.file_name = optarg;
 404                         break;
 405                 case 'r':
 406                         rootfs_info.file_name = optarg;
 407                         break;
 408                 case 'o':
 409                         ofname = optarg;
 410                         break;
 411                 case 'v':
 412                         version = optarg;
 413                         break;
 414                 case 'h':
 415                         usage(EXIT_SUCCESS);
 416                         break;
 417                 default:
 418                         usage(EXIT_FAILURE);
 419                         break;
 420                 }
 421         }
 422
 423         ret = check_options();
 424         if (ret)
 425                 goto out;
 426
 427         ret = build_fw();
 428
 429  out:
 430         return ret;
 431 }
 432