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 <arpa/inet.h>
  26 #include <netinet/in.h>
  27
  28 #include "md5.h"
  29
  30 #define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })
  31 #define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a)[0]))
  32
  33 #define HEADER_VERSION_V1       0x01000000
  34 #define HEADER_VERSION_V2       0x02000000
  35
  36 #define MD5SUM_LEN      16
  37
  38 struct file_info {
  39         char            *file_name;     /* name of the file */
  40         uint32_t        file_size;      /* length of the file */
  41 };
  42
  43 struct fw_header {
  44         uint32_t        version;        /* header version */
  45         char            vendor_name[24];
  46         char            fw_version[36];
  47         uint32_t        hw_id;          /* hardware id */
  48         uint32_t        hw_rev;         /* hardware revision */
  49         uint32_t        region_code;    /* region code */
  50         uint8_t         md5sum1[MD5SUM_LEN];
  51         uint32_t        unk2;
  52         uint8_t         md5sum2[MD5SUM_LEN];
  53         uint32_t        unk3;
  54         uint32_t        kernel_la;      /* kernel load address */
  55         uint32_t        kernel_ep;      /* kernel entry point */
  56         uint32_t        fw_length;      /* total length of the firmware */
  57         uint32_t        kernel_ofs;     /* kernel data offset */
  58         uint32_t        kernel_len;     /* kernel data length */
  59         uint32_t        rootfs_ofs;     /* rootfs data offset */
  60         uint32_t        rootfs_len;     /* rootfs data length */
  61         uint32_t        boot_ofs;       /* bootloader data offset */
  62         uint32_t        boot_len;       /* bootloader data length */
  63         uint16_t        ver_hi;
  64         uint16_t        ver_mid;
  65         uint16_t        ver_lo;
  66         uint8_t         pad[130];
  67         char            region_str1[32];
  68         char            region_str2[32];
  69         uint8_t         pad2[160];
  70 } __attribute__ ((packed));
  71
  72 struct flash_layout {
  73         char            *id;
  74         uint32_t        fw_max_len;
  75         uint32_t        kernel_la;
  76         uint32_t        kernel_ep;
  77         uint32_t        rootfs_ofs;
  78 };
  79
  80 struct fw_region {
  81         char            name[4];
  82         uint32_t        code;
  83 };
  84
  85
  86 /*
  87  * Globals
  88  */
  89 static char *ofname;
  90 static char *progname;
  91 static char *vendor = "TP-LINK Technologies";
  92 static char *version = "ver. 1.0";
  93 static char *fw_ver = "0.0.0";
  94 static uint32_t hdr_ver = HEADER_VERSION_V1;
  95
  96 static char *layout_id;
  97 static struct flash_layout *layout;
  98 static char *opt_hw_id;
  99 static uint32_t hw_id;
 100 static char *opt_hw_rev;
 101 static uint32_t hw_rev;
 102 static uint32_t opt_hdr_ver = 1;
 103 static char *country;
 104 static const struct fw_region *region;
 105 static int fw_ver_lo;
 106 static int fw_ver_mid;
 107 static int fw_ver_hi;
 108 static struct file_info kernel_info;
 109 static uint32_t kernel_la = 0;
 110 static uint32_t kernel_ep = 0;
 111 static uint32_t kernel_len = 0;
 112 static struct file_info rootfs_info;
 113 static uint32_t rootfs_ofs = 0;
 114 static uint32_t rootfs_align;
 115 static struct file_info boot_info;
 116 static int combined;
 117 static int strip_padding;
 118 static int ignore_size;
 119 static int add_jffs2_eof;
 120 static unsigned char jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
 121 static uint32_t fw_max_len;
 122 static uint32_t reserved_space;
 123
 124 static struct file_info inspect_info;
 125 static int extract = 0;
 126
 127 static const char md5salt_normal[MD5SUM_LEN] = {
 128         0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
 129         0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
 130 };
 131
 132 static const char md5salt_boot[MD5SUM_LEN] = {
 133         0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
 134         0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
 135 };
 136
 137 static struct flash_layout layouts[] = {
 138         {
 139                 .id             = "4M",
 140                 .fw_max_len     = 0x3c0000,
 141                 .kernel_la      = 0x80060000,
 142                 .kernel_ep      = 0x80060000,
 143                 .rootfs_ofs     = 0x140000,
 144         }, {
 145                 .id             = "4Mlzma",
 146                 .fw_max_len     = 0x3c0000,
 147                 .kernel_la      = 0x80060000,
 148                 .kernel_ep      = 0x80060000,
 149                 .rootfs_ofs     = 0x100000,
 150         }, {
 151                 .id             = "8M",
 152                 .fw_max_len     = 0x7c0000,
 153                 .kernel_la      = 0x80060000,
 154                 .kernel_ep      = 0x80060000,
 155                 .rootfs_ofs     = 0x140000,
 156         }, {
 157                 .id             = "8Mlzma",
 158                 .fw_max_len     = 0x7c0000,
 159                 .kernel_la      = 0x80060000,
 160                 .kernel_ep      = 0x80060000,
 161                 .rootfs_ofs     = 0x100000,
 162         }, {
 163                 .id             = "16M",
 164                 .fw_max_len     = 0xf80000,
 165                 .kernel_la      = 0x80060000,
 166                 .kernel_ep      = 0x80060000,
 167                 .rootfs_ofs     = 0x140000,
 168         }, {
 169                 .id             = "16Mlzma",
 170                 .fw_max_len     = 0xf80000,
 171                 .kernel_la      = 0x80060000,
 172                 .kernel_ep      = 0x80060000,
 173                 .rootfs_ofs     = 0x100000,
 174         }, {
 175                 .id             = "16Mppc",
 176                 .fw_max_len     = 0xf80000,
 177                 .kernel_la      = 0x00000000 ,
 178                 .kernel_ep      = 0xc0000000,
 179                 .rootfs_ofs     = 0x2a0000,
 180         }, {
 181                 /* terminating entry */
 182         }
 183 };
 184
 185 static const struct fw_region regions[] = {
 186         /* Default region (universal) uses code 0 as well */
 187         {"US", 1},
 188         {"EU", 0},
 189 };
 190
 191 /*
 192  * Message macros
 193  */
 194 #define ERR(fmt, ...) do { \
 195         fflush(0); \
 196         fprintf(stderr, "[%s] *** error: " fmt "\n", \
 197                         progname, ## __VA_ARGS__ ); \
 198 } while (0)
 199
 200 #define ERRS(fmt, ...) do { \
 201         int save = errno; \
 202         fflush(0); \
 203         fprintf(stderr, "[%s] *** error: " fmt ": %s\n", \
 204                         progname, ## __VA_ARGS__, strerror(save)); \
 205 } while (0)
 206
 207 #define DBG(fmt, ...) do { \
 208         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 209 } while (0)
 210
 211 static struct flash_layout *find_layout(const char *id)
 212 {
 213         struct flash_layout *ret;
 214         struct flash_layout *l;
 215
 216         ret = NULL;
 217         for (l = layouts; l->id != NULL; l++){
 218                 if (strcasecmp(id, l->id) == 0) {
 219                         ret = l;
 220                         break;
 221                 }
 222         };
 223
 224         return ret;
 225 }
 226
 227 static const struct fw_region * find_region(const char *country) {
 228         size_t i;
 229
 230         for (i = 0; i < ARRAY_SIZE(regions); i++) {
 231                 if (strcasecmp(regions[i].name, country) == 0)
 232                         return &regions[i];
 233         }
 234
 235         return NULL;
 236 }
 237
 238 static void usage(int status)
 239 {
 240         fprintf(stderr, "Usage: %s [OPTIONS...]\n", progname);
 241         fprintf(stderr,
 242 "\n"
 243 "Options:\n"
 244 "  -c              use combined kernel image\n"
 245 "  -E <ep>         overwrite kernel entry point with <ep> (hexval prefixed with 0x)\n"
 246 "  -L <la>         overwrite kernel load address with <la> (hexval prefixed with 0x)\n"
 247 "  -H <hwid>       use hardware id specified with <hwid>\n"
 248 "  -W <hwrev>      use hardware revision specified with <hwrev>\n"
 249 "  -C <country>    set region code to <country>\n"
 250 "  -F <id>         use flash layout specified with <id>\n"
 251 "  -k <file>       read kernel image from the file <file>\n"
 252 "  -r <file>       read rootfs image from the file <file>\n"
 253 "  -a <align>      align the rootfs start on an <align> bytes boundary\n"
 254 "  -R <offset>     overwrite rootfs offset with <offset> (hexval prefixed with 0x)\n"
 255 "  -o <file>       write output to the file <file>\n"
 256 "  -s              strip padding from the end of the image\n"
 257 "  -S              ignore firmware size limit (only for combined images)\n"
 258 "  -j              add jffs2 end-of-filesystem markers\n"
 259 "  -N <vendor>     set image vendor to <vendor>\n"
 260 "  -V <version>    set image version to <version>\n"
 261 "  -v <version>    set firmware version to <version>\n"
 262 "  -m <version>    set header version to <version>\n"
 263 "  -i <file>       inspect given firmware file <file>\n"
 264 "  -x              extract kernel and rootfs while inspecting (requires -i)\n"
 265 "  -X <size>       reserve <size> bytes in the firmware image (hexval prefixed with 0x)\n"
 266 "  -h              show this screen\n"
 267         );
 268
 269         exit(status);
 270 }
 271
 272 static void get_md5(const char *data, int size, uint8_t *md5)
 273 {
 274         MD5_CTX ctx;
 275
 276         MD5_Init(&ctx);
 277         MD5_Update(&ctx, data, size);
 278         MD5_Final(md5, &ctx);
 279 }
 280
 281 static int get_file_stat(struct file_info *fdata)
 282 {
 283         struct stat st;
 284         int res;
 285
 286         if (fdata->file_name == NULL)
 287                 return 0;
 288
 289         res = stat(fdata->file_name, &st);
 290         if (res){
 291                 ERRS("stat failed on %s", fdata->file_name);
 292                 return res;
 293         }
 294
 295         fdata->file_size = st.st_size;
 296         return 0;
 297 }
 298
 299 static int read_to_buf(const struct file_info *fdata, char *buf)
 300 {
 301         FILE *f;
 302         int ret = EXIT_FAILURE;
 303
 304         f = fopen(fdata->file_name, "r");
 305         if (f == NULL) {
 306                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 307                 goto out;
 308         }
 309
 310         errno = 0;
 311         fread(buf, fdata->file_size, 1, f);
 312         if (errno != 0) {
 313                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 314                 goto out_close;
 315         }
 316
 317         ret = EXIT_SUCCESS;
 318
 319  out_close:
 320         fclose(f);
 321  out:
 322         return ret;
 323 }
 324
 325 static int check_options(void)
 326 {
 327         int ret;
 328         int exceed_bytes;
 329
 330         if (inspect_info.file_name) {
 331                 ret = get_file_stat(&inspect_info);
 332                 if (ret)
 333                         return ret;
 334
 335                 return 0;
 336         } else if (extract) {
 337                 ERR("no firmware for inspection specified");
 338                 return -1;
 339         }
 340
 341         if (opt_hw_id == NULL) {
 342                 ERR("hardware id not specified");
 343                 return -1;
 344         }
 345         hw_id = strtoul(opt_hw_id, NULL, 0);
 346
 347         if (layout_id == NULL) {
 348                 ERR("flash layout is not specified");
 349                 return -1;
 350         }
 351
 352         if (opt_hw_rev)
 353                 hw_rev = strtoul(opt_hw_rev, NULL, 0);
 354         else
 355                 hw_rev = 1;
 356
 357         if (country) {
 358                 region = find_region(country);
 359                 if (!region) {
 360                         ERR("unknown region code \"%s\"", country);
 361                         return -1;
 362                 }
 363         }
 364
 365         layout = find_layout(layout_id);
 366         if (layout == NULL) {
 367                 ERR("unknown flash layout \"%s\"", layout_id);
 368                 return -1;
 369         }
 370
 371         if (!kernel_la)
 372                 kernel_la = layout->kernel_la;
 373         if (!kernel_ep)
 374                 kernel_ep = layout->kernel_ep;
 375         if (!rootfs_ofs)
 376                 rootfs_ofs = layout->rootfs_ofs;
 377
 378         if (reserved_space > layout->fw_max_len) {
 379                 ERR("reserved space is not valid");
 380                 return -1;
 381         }
 382
 383         fw_max_len = layout->fw_max_len - reserved_space;
 384
 385         if (kernel_info.file_name == NULL) {
 386                 ERR("no kernel image specified");
 387                 return -1;
 388         }
 389
 390         ret = get_file_stat(&kernel_info);
 391         if (ret)
 392                 return ret;
 393
 394         kernel_len = kernel_info.file_size;
 395
 396         if (combined) {
 397                 exceed_bytes = kernel_info.file_size - (fw_max_len - sizeof(struct fw_header));
 398                 if (exceed_bytes > 0) {
 399                         if (!ignore_size) {
 400                                 ERR("kernel image is too big by %i bytes", exceed_bytes);
 401                                 return -1;
 402                         }
 403                         layout->fw_max_len = sizeof(struct fw_header) +
 404                                              kernel_info.file_size +
 405                                              reserved_space;
 406                 }
 407         } else {
 408                 if (rootfs_info.file_name == NULL) {
 409                         ERR("no rootfs image specified");
 410                         return -1;
 411                 }
 412
 413                 ret = get_file_stat(&rootfs_info);
 414                 if (ret)
 415                         return ret;
 416
 417                 if (rootfs_align) {
 418                         kernel_len += sizeof(struct fw_header);
 419                         kernel_len = ALIGN(kernel_len, rootfs_align);
 420                         kernel_len -= sizeof(struct fw_header);
 421
 422                         DBG("kernel length aligned to %u", kernel_len);
 423
 424                         exceed_bytes = kernel_len + rootfs_info.file_size - (fw_max_len - sizeof(struct fw_header));
 425                         if (exceed_bytes > 0) {
 426                                 ERR("images are too big by %i bytes", exceed_bytes);
 427                                 return -1;
 428                         }
 429                 } else {
 430                         exceed_bytes = kernel_info.file_size - (rootfs_ofs - sizeof(struct fw_header));
 431                         if (exceed_bytes > 0) {
 432                                 ERR("kernel image is too big by %i bytes", exceed_bytes);
 433                                 return -1;
 434                         }
 435
 436                         exceed_bytes = rootfs_info.file_size - (fw_max_len - rootfs_ofs);
 437                         if (exceed_bytes > 0) {
 438                                 ERR("rootfs image is too big by %i bytes", exceed_bytes);
 439                                 return -1;
 440                         }
 441                 }
 442         }
 443
 444         if (ofname == NULL) {
 445                 ERR("no output file specified");
 446                 return -1;
 447         }
 448
 449         ret = sscanf(fw_ver, "%d.%d.%d", &fw_ver_hi, &fw_ver_mid, &fw_ver_lo);
 450         if (ret != 3) {
 451                 ERR("invalid firmware version '%s'", fw_ver);
 452                 return -1;
 453         }
 454
 455         if (opt_hdr_ver == 1) {
 456                 hdr_ver = HEADER_VERSION_V1;
 457         } else if (opt_hdr_ver == 2) {
 458                 hdr_ver = HEADER_VERSION_V2;
 459         } else {
 460                 ERR("invalid header version '%u'", opt_hdr_ver);
 461                 return -1;
 462         }
 463
 464         return 0;
 465 }
 466
 467 static void fill_header(char *buf, int len)
 468 {
 469         struct fw_header *hdr = (struct fw_header *)buf;
 470
 471         memset(hdr, 0, sizeof(struct fw_header));
 472
 473         hdr->version = htonl(hdr_ver);
 474         strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
 475         strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
 476         hdr->hw_id = htonl(hw_id);
 477         hdr->hw_rev = htonl(hw_rev);
 478
 479         if (boot_info.file_size == 0)
 480                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
 481         else
 482                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
 483
 484         hdr->kernel_la = htonl(kernel_la);
 485         hdr->kernel_ep = htonl(kernel_ep);
 486         hdr->fw_length = htonl(layout->fw_max_len);
 487         hdr->kernel_ofs = htonl(sizeof(struct fw_header));
 488         hdr->kernel_len = htonl(kernel_len);
 489         if (!combined) {
 490                 hdr->rootfs_ofs = htonl(rootfs_ofs);
 491                 hdr->rootfs_len = htonl(rootfs_info.file_size);
 492         }
 493
 494         hdr->ver_hi = htons(fw_ver_hi);
 495         hdr->ver_mid = htons(fw_ver_mid);
 496         hdr->ver_lo = htons(fw_ver_lo);
 497
 498         if (region) {
 499                 hdr->region_code = htonl(region->code);
 500                 snprintf(
 501                         hdr->region_str1, sizeof(hdr->region_str1), "00000000;%02X%02X%02X%02X;",
 502                         region->name[0], region->name[1], region->name[2], region->name[3]
 503                 );
 504                 snprintf(
 505                         hdr->region_str2, sizeof(hdr->region_str2), "%02X%02X%02X%02X",
 506                         region->name[0], region->name[1], region->name[2], region->name[3]
 507                 );
 508         }
 509
 510         get_md5(buf, len, hdr->md5sum1);
 511 }
 512
 513 static int pad_jffs2(char *buf, int currlen)
 514 {
 515         int len;
 516         uint32_t pad_mask;
 517
 518         len = currlen;
 519         pad_mask = (64 * 1024);
 520         while ((len < layout->fw_max_len) && (pad_mask != 0)) {
 521                 uint32_t mask;
 522                 int i;
 523
 524                 for (i = 10; i < 32; i++) {
 525                         mask = 1 << i;
 526                         if (pad_mask & mask)
 527                                 break;
 528                 }
 529
 530                 len = ALIGN(len, mask);
 531
 532                 for (i = 10; i < 32; i++) {
 533                         mask = 1 << i;
 534                         if ((len & (mask - 1)) == 0)
 535                                 pad_mask &= ~mask;
 536                 }
 537
 538                 for (i = 0; i < sizeof(jffs2_eof_mark); i++)
 539                         buf[len + i] = jffs2_eof_mark[i];
 540
 541                 len += sizeof(jffs2_eof_mark);
 542         }
 543
 544         return len;
 545 }
 546
 547 static int write_fw(const char *data, int len)
 548 {
 549         FILE *f;
 550         int ret = EXIT_FAILURE;
 551
 552         f = fopen(ofname, "w");
 553         if (f == NULL) {
 554                 ERRS("could not open \"%s\" for writing", ofname);
 555                 goto out;
 556         }
 557
 558         errno = 0;
 559         fwrite(data, len, 1, f);
 560         if (errno) {
 561                 ERRS("unable to write output file");
 562                 goto out_flush;
 563         }
 564
 565         DBG("firmware file \"%s\" completed", ofname);
 566
 567         ret = EXIT_SUCCESS;
 568
 569  out_flush:
 570         fflush(f);
 571         fclose(f);
 572         if (ret != EXIT_SUCCESS) {
 573                 unlink(ofname);
 574         }
 575  out:
 576         return ret;
 577 }
 578
 579 static int build_fw(void)
 580 {
 581         int buflen;
 582         char *buf;
 583         char *p;
 584         int ret = EXIT_FAILURE;
 585         int writelen = 0;
 586
 587         buflen = layout->fw_max_len;
 588
 589         buf = malloc(buflen);
 590         if (!buf) {
 591                 ERR("no memory for buffer\n");
 592                 goto out;
 593         }
 594
 595         memset(buf, 0xff, buflen);
 596         p = buf + sizeof(struct fw_header);
 597         ret = read_to_buf(&kernel_info, p);
 598         if (ret)
 599                 goto out_free_buf;
 600
 601         writelen = sizeof(struct fw_header) + kernel_len;
 602
 603         if (!combined) {
 604                 if (rootfs_align)
 605                         p = buf + writelen;
 606                 else
 607                         p = buf + rootfs_ofs;
 608
 609                 ret = read_to_buf(&rootfs_info, p);
 610                 if (ret)
 611                         goto out_free_buf;
 612
 613                 if (rootfs_align)
 614                         writelen += rootfs_info.file_size;
 615                 else
 616                         writelen = rootfs_ofs + rootfs_info.file_size;
 617
 618                 if (add_jffs2_eof)
 619                         writelen = pad_jffs2(buf, writelen);
 620         }
 621
 622         if (!strip_padding)
 623                 writelen = buflen;
 624
 625         fill_header(buf, writelen);
 626         ret = write_fw(buf, writelen);
 627         if (ret)
 628                 goto out_free_buf;
 629
 630         ret = EXIT_SUCCESS;
 631
 632  out_free_buf:
 633         free(buf);
 634  out:
 635         return ret;
 636 }
 637
 638 /* Helper functions to inspect_fw() representing different output formats */
 639 static inline void inspect_fw_pstr(const char *label, const char *str)
 640 {
 641         printf("%-23s: %s\n", label, str);
 642 }
 643
 644 static inline void inspect_fw_phex(const char *label, uint32_t val)
 645 {
 646         printf("%-23s: 0x%08x\n", label, val);
 647 }
 648
 649 static inline void inspect_fw_phexdec(const char *label, uint32_t val)
 650 {
 651         printf("%-23s: 0x%08x / %8u bytes\n", label, val, val);
 652 }
 653
 654 static inline void inspect_fw_pmd5sum(const char *label, const uint8_t *val, const char *text)
 655 {
 656         int i;
 657
 658         printf("%-23s:", label);
 659         for (i=0; i<MD5SUM_LEN; i++)
 660                 printf(" %02x", val[i]);
 661         printf(" %s\n", text);
 662 }
 663
 664 static int inspect_fw(void)
 665 {
 666         char *buf;
 667         struct fw_header *hdr;
 668         uint8_t md5sum[MD5SUM_LEN];
 669         int ret = EXIT_FAILURE;
 670
 671         buf = malloc(inspect_info.file_size);
 672         if (!buf) {
 673                 ERR("no memory for buffer!\n");
 674                 goto out;
 675         }
 676
 677         ret = read_to_buf(&inspect_info, buf);
 678         if (ret)
 679                 goto out_free_buf;
 680         hdr = (struct fw_header *)buf;
 681
 682         inspect_fw_pstr("File name", inspect_info.file_name);
 683         inspect_fw_phexdec("File size", inspect_info.file_size);
 684
 685         if ((ntohl(hdr->version) != HEADER_VERSION_V1) &&
 686             (ntohl(hdr->version) != HEADER_VERSION_V2)) {
 687                 ERR("file does not seem to have V1/V2 header!\n");
 688                 goto out_free_buf;
 689         }
 690
 691         inspect_fw_phexdec("Version 1 Header size", sizeof(struct fw_header));
 692
 693         memcpy(md5sum, hdr->md5sum1, sizeof(md5sum));
 694         if (ntohl(hdr->boot_len) == 0)
 695                 memcpy(hdr->md5sum1, md5salt_normal, sizeof(md5sum));
 696         else
 697                 memcpy(hdr->md5sum1, md5salt_boot, sizeof(md5sum));
 698         get_md5(buf, inspect_info.file_size, hdr->md5sum1);
 699
 700         if (memcmp(md5sum, hdr->md5sum1, sizeof(md5sum))) {
 701                 inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(*ERROR*)");
 702                 inspect_fw_pmd5sum("          --> expected", hdr->md5sum1, "");
 703         } else {
 704                 inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(ok)");
 705         }
 706         if (ntohl(hdr->unk2) != 0)
 707                 inspect_fw_phexdec("Unknown value 2", hdr->unk2);
 708         inspect_fw_pmd5sum("Header MD5Sum2", hdr->md5sum2,
 709                            "(purpose yet unknown, unchecked here)");
 710         if (ntohl(hdr->unk3) != 0)
 711                 inspect_fw_phexdec("Unknown value 3", hdr->unk3);
 712
 713         printf("\n");
 714
 715         inspect_fw_pstr("Vendor name", hdr->vendor_name);
 716         inspect_fw_pstr("Firmware version", hdr->fw_version);
 717         inspect_fw_phex("Hardware ID", ntohl(hdr->hw_id));
 718         inspect_fw_phex("Hardware Revision", ntohl(hdr->hw_rev));
 719         inspect_fw_phex("Region code", ntohl(hdr->region_code));
 720
 721         printf("\n");
 722
 723         inspect_fw_phexdec("Kernel data offset",
 724                            ntohl(hdr->kernel_ofs));
 725         inspect_fw_phexdec("Kernel data length",
 726                            ntohl(hdr->kernel_len));
 727         inspect_fw_phex("Kernel load address",
 728                         ntohl(hdr->kernel_la));
 729         inspect_fw_phex("Kernel entry point",
 730                         ntohl(hdr->kernel_ep));
 731         inspect_fw_phexdec("Rootfs data offset",
 732                            ntohl(hdr->rootfs_ofs));
 733         inspect_fw_phexdec("Rootfs data length",
 734                            ntohl(hdr->rootfs_len));
 735         inspect_fw_phexdec("Boot loader data offset",
 736                            ntohl(hdr->boot_ofs));
 737         inspect_fw_phexdec("Boot loader data length",
 738                            ntohl(hdr->boot_len));
 739         inspect_fw_phexdec("Total firmware length",
 740                            ntohl(hdr->fw_length));
 741
 742         if (extract) {
 743                 FILE *fp;
 744                 char *filename;
 745
 746                 printf("\n");
 747
 748                 filename = malloc(strlen(inspect_info.file_name) + 8);
 749                 sprintf(filename, "%s-kernel", inspect_info.file_name);
 750                 printf("Extracting kernel to \"%s\"...\n", filename);
 751                 fp = fopen(filename, "w");
 752                 if (fp) {
 753                         if (!fwrite(buf + ntohl(hdr->kernel_ofs),
 754                                     ntohl(hdr->kernel_len), 1, fp)) {
 755                                 ERR("error in fwrite(): %s", strerror(errno));
 756                         }
 757                         fclose(fp);
 758                 } else {
 759                         ERR("error in fopen(): %s", strerror(errno));
 760                 }
 761                 free(filename);
 762
 763                 filename = malloc(strlen(inspect_info.file_name) + 8);
 764                 sprintf(filename, "%s-rootfs", inspect_info.file_name);
 765                 printf("Extracting rootfs to \"%s\"...\n", filename);
 766                 fp = fopen(filename, "w");
 767                 if (fp) {
 768                         if (!fwrite(buf + ntohl(hdr->rootfs_ofs),
 769                                     ntohl(hdr->rootfs_len), 1, fp)) {
 770                                 ERR("error in fwrite(): %s", strerror(errno));
 771                         }
 772                         fclose(fp);
 773                 } else {
 774                         ERR("error in fopen(): %s", strerror(errno));
 775                 }
 776                 free(filename);
 777         }
 778
 779  out_free_buf:
 780         free(buf);
 781  out:
 782         return ret;
 783 }
 784
 785 int main(int argc, char *argv[])
 786 {
 787         int ret = EXIT_FAILURE;
 788
 789         progname = basename(argv[0]);
 790
 791         while ( 1 ) {
 792                 int c;
 793
 794                 c = getopt(argc, argv, "a:H:E:F:L:m:V:N:W:C:ci:k:r:R:o:xX:hsSjv:");
 795                 if (c == -1)
 796                         break;
 797
 798                 switch (c) {
 799                 case 'a':
 800                         sscanf(optarg, "0x%x", &rootfs_align);
 801                         break;
 802                 case 'H':
 803                         opt_hw_id = optarg;
 804                         break;
 805                 case 'E':
 806                         sscanf(optarg, "0x%x", &kernel_ep);
 807                         break;
 808                 case 'F':
 809                         layout_id = optarg;
 810                         break;
 811                 case 'W':
 812                         opt_hw_rev = optarg;
 813                         break;
 814                 case 'C':
 815                         country = optarg;
 816                         break;
 817                 case 'L':
 818                         sscanf(optarg, "0x%x", &kernel_la);
 819                         break;
 820                 case 'm':
 821                         sscanf(optarg, "%u", &opt_hdr_ver);
 822                         break;
 823                 case 'V':
 824                         version = optarg;
 825                         break;
 826                 case 'v':
 827                         fw_ver = optarg;
 828                         break;
 829                 case 'N':
 830                         vendor = optarg;
 831                         break;
 832                 case 'c':
 833                         combined++;
 834                         break;
 835                 case 'k':
 836                         kernel_info.file_name = optarg;
 837                         break;
 838                 case 'r':
 839                         rootfs_info.file_name = optarg;
 840                         break;
 841                 case 'R':
 842                         sscanf(optarg, "0x%x", &rootfs_ofs);
 843                         break;
 844                 case 'o':
 845                         ofname = optarg;
 846                         break;
 847                 case 's':
 848                         strip_padding = 1;
 849                         break;
 850                 case 'S':
 851                         ignore_size = 1;
 852                         break;
 853                 case 'i':
 854                         inspect_info.file_name = optarg;
 855                         break;
 856                 case 'j':
 857                         add_jffs2_eof = 1;
 858                         break;
 859                 case 'x':
 860                         extract = 1;
 861                         break;
 862                 case 'h':
 863                         usage(EXIT_SUCCESS);
 864                         break;
 865                 case 'X':
 866                         sscanf(optarg, "0x%x", &reserved_space);
 867                         break;
 868                 default:
 869                         usage(EXIT_FAILURE);
 870                         break;
 871                 }
 872         }
 873
 874         ret = check_options();
 875         if (ret)
 876                 goto out;
 877
 878         if (!inspect_info.file_name)
 879                 ret = build_fw();
 880         else
 881                 ret = inspect_fw();
 882
 883  out:
 884         return ret;
 885 }