2 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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>
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.
18 #include <unistd.h> /* for unlink() */
20 #include <getopt.h> /* for getopt() */
27 #include <arpa/inet.h>
28 #include <netinet/in.h>
32 #define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })
37 char *file_name; /* name of the file */
38 uint32_t file_size; /* length of the file */
42 uint32_t version; /* 0x00: header version */
43 char fw_version[48]; /* 0x04: fw version string */
44 uint32_t hw_id; /* 0x34: hardware id */
45 uint32_t hw_rev; /* 0x38: FIXME: hardware revision? */
46 uint32_t hw_ver_add; /* 0x3c: additional hardware version */
47 uint8_t md5sum1[MD5SUM_LEN]; /* 0x40 */
48 uint32_t unk2; /* 0x50: 0x00000000 */
49 uint8_t md5sum2[MD5SUM_LEN]; /* 0x54 */
50 uint32_t unk3; /* 0x64: 0xffffffff */
52 uint32_t kernel_la; /* 0x68: kernel load address */
53 uint32_t kernel_ep; /* 0x6c: kernel entry point */
54 uint32_t fw_length; /* 0x70: total length of the image */
55 uint32_t kernel_ofs; /* 0x74: kernel data offset */
56 uint32_t kernel_len; /* 0x78: kernel data length */
57 uint32_t rootfs_ofs; /* 0x7c: rootfs data offset */
58 uint32_t rootfs_len; /* 0x80: rootfs data length */
59 uint32_t boot_ofs; /* 0x84: bootloader offset */
60 uint32_t boot_len; /* 0x88: bootloader length */
61 uint16_t unk4; /* 0x8c: 0x55aa */
62 uint8_t sver_hi; /* 0x8e */
63 uint8_t sver_lo; /* 0x8f */
64 uint8_t unk5; /* 0x90: magic: 0xa5 */
65 uint8_t ver_hi; /* 0x91 */
66 uint8_t ver_mid; /* 0x92 */
67 uint8_t ver_lo; /* 0x93 */
69 } __attribute__ ((packed));
79 #define FLAG_LE_KERNEL_LA_EP 0x00000001 /* Little-endian used for kernel load address & entry point */
95 static char *progname;
96 static char *vendor = "TP-LINK Technologies";
97 static char *version = "ver. 1.0";
98 static char *fw_ver = "0.0.0";
99 static char *sver = "1.0";
100 static uint32_t hdr_ver = 2;
102 static struct board_info custom_board;
104 static char *board_id;
105 static struct board_info *board;
106 static char *layout_id;
107 static struct flash_layout *layout;
108 static char *opt_hw_id;
109 static char *opt_hw_rev;
110 static char *opt_hw_ver_add;
111 static int fw_ver_lo;
112 static int fw_ver_mid;
113 static int fw_ver_hi;
116 static struct file_info kernel_info;
117 static uint32_t kernel_la = 0;
118 static uint32_t kernel_ep = 0;
119 static uint32_t kernel_len = 0;
120 static struct file_info rootfs_info;
121 static uint32_t rootfs_ofs = 0;
122 static uint32_t rootfs_align;
123 static struct file_info boot_info;
125 static int strip_padding;
126 static int add_jffs2_eof;
127 static unsigned char jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
129 static struct file_info inspect_info;
130 static int extract = 0;
132 char md5salt_normal[MD5SUM_LEN] = {
133 0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
134 0xdc, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x37,
137 char md5salt_boot[MD5SUM_LEN] = {
138 0x8c, 0xef, 0x33, 0x5f, 0xd5, 0xc5, 0xce, 0xfa,
139 0xac, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
142 static struct flash_layout layouts[] = {
145 .fw_max_len = 0x7a0000,
146 .kernel_la = 0x80002000,
147 .kernel_ep = 0x80002000,
148 .rootfs_ofs = 0x140000,
151 .fw_max_len = 0xf90000,
152 .kernel_la = 0x80002000,
153 .kernel_ep = 0x800061b0,
154 .rootfs_ofs = 0x140000,
157 .fw_max_len = 0x7a0000,
158 .kernel_la = 0x80000000,
159 .kernel_ep = 0x80000000,
160 .rootfs_ofs = 0x140000,
163 .fw_max_len = 0x7b0000,
164 .kernel_la = 0x80000000,
165 .kernel_ep = 0x80000000,
166 .rootfs_ofs = 0x140000,
168 /* terminating entry */
172 static struct board_info boards[] = {
177 .layout_id = "8Mltq",
182 .layout_id = "8Mltq",
187 .layout_id = "8Mmtk",
189 .flags = FLAG_LE_KERNEL_LA_EP,
191 .id = "ArcherVR200V",
194 .layout_id = "16Mltq",
200 .layout_id = "8Mmtk",
202 .flags = FLAG_LE_KERNEL_LA_EP,
207 .layout_id = "8MLmtk",
209 .flags = FLAG_LE_KERNEL_LA_EP,
215 .layout_id = "8Mmtk",
217 .flags = FLAG_LE_KERNEL_LA_EP,
219 .id = "TL-WR841NV13",
223 .layout_id = "8Mmtk",
225 .flags = FLAG_LE_KERNEL_LA_EP,
227 /* terminating entry */
234 #define ERR(fmt, ...) do { \
236 fprintf(stderr, "[%s] *** error: " fmt "\n", \
237 progname, ## __VA_ARGS__ ); \
240 #define ERRS(fmt, ...) do { \
243 fprintf(stderr, "[%s] *** error: " fmt ": %s\n", \
244 progname, ## __VA_ARGS__, strerror(save)); \
247 #define DBG(fmt, ...) do { \
248 fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
251 static struct board_info *find_board(char *id)
253 struct board_info *ret;
254 struct board_info *board;
257 for (board = boards; board->id != NULL; board++){
258 if (strcasecmp(id, board->id) == 0) {
267 static struct board_info *find_board_by_hwid(uint32_t hw_id)
269 struct board_info *board;
271 for (board = boards; board->id != NULL; board++) {
272 if (hw_id == board->hw_id)
279 static struct flash_layout *find_layout(char *id)
281 struct flash_layout *ret;
282 struct flash_layout *l;
285 for (l = layouts; l->id != NULL; l++){
286 if (strcasecmp(id, l->id) == 0) {
295 static void usage(int status)
297 FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
298 struct board_info *board;
300 fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
304 " -B <board> create image for the board specified with <board>\n"
305 " -c use combined kernel image\n"
306 " -e swap endianness in kernel load address and entry point\n"
307 " -E <ep> overwrite kernel entry point with <ep> (hexval prefixed with 0x)\n"
308 " -L <la> overwrite kernel load address with <la> (hexval prefixed with 0x)\n"
309 " -H <hwid> use hardware id specified with <hwid>\n"
310 " -W <hwrev> use hardware revision specified with <hwrev>\n"
311 " -w <hwveradd> use additional hardware version specified with <hwveradd>\n"
312 " -F <id> use flash layout specified with <id>\n"
313 " -k <file> read kernel image from the file <file>\n"
314 " -r <file> read rootfs image from the file <file>\n"
315 " -a <align> align the rootfs start on an <align> bytes boundary\n"
316 " -R <offset> overwrite rootfs offset with <offset> (hexval prefixed with 0x)\n"
317 " -o <file> write output to the file <file>\n"
318 " -s strip padding from the end of the image\n"
319 " -j add jffs2 end-of-filesystem markers\n"
320 " -N <vendor> set image vendor to <vendor>\n"
321 " -T <version> set header version to <version>\n"
322 " -V <version> set image version to <version>\n"
323 " -v <version> set firmware version to <version>\n"
324 " -y <version> set secondary version to <version>\n"
325 " -i <file> inspect given firmware file <file>\n"
326 " -x extract kernel and rootfs while inspecting (requires -i)\n"
327 " -h show this screen\n"
333 static int get_md5(char *data, int size, char *md5)
338 MD5_Update(&ctx, data, size);
339 MD5_Final(md5, &ctx);
342 static int get_file_stat(struct file_info *fdata)
347 if (fdata->file_name == NULL)
350 res = stat(fdata->file_name, &st);
352 ERRS("stat failed on %s", fdata->file_name);
356 fdata->file_size = st.st_size;
360 static int read_to_buf(struct file_info *fdata, char *buf)
363 int ret = EXIT_FAILURE;
365 f = fopen(fdata->file_name, "r");
367 ERRS("could not open \"%s\" for reading", fdata->file_name);
372 fread(buf, fdata->file_size, 1, f);
374 ERRS("unable to read from file \"%s\"", fdata->file_name);
386 static int check_options(void)
390 if (inspect_info.file_name) {
391 ret = get_file_stat(&inspect_info);
396 } else if (extract) {
397 ERR("no firmware for inspection specified");
401 if (board_id == NULL && opt_hw_id == NULL) {
402 ERR("either board or hardware id must be specified");
407 board = find_board(board_id);
409 ERR("unknown/unsupported board id \"%s\"", board_id);
412 if (layout_id == NULL)
413 layout_id = board->layout_id;
416 hdr_ver = board->hdr_ver;
418 board = &custom_board;
420 if (layout_id == NULL) {
421 ERR("flash layout is not specified");
425 board->hw_id = strtoul(opt_hw_id, NULL, 0);
428 board->hw_rev = strtoul(opt_hw_rev, NULL, 0);
433 board->hw_ver_add = strtoul(opt_hw_ver_add, NULL, 0);
435 board->hw_ver_add = 0;
438 layout = find_layout(layout_id);
439 if (layout == NULL) {
440 ERR("unknown flash layout \"%s\"", layout_id);
445 kernel_la = layout->kernel_la;
447 kernel_ep = layout->kernel_ep;
449 rootfs_ofs = layout->rootfs_ofs;
451 if (kernel_info.file_name == NULL) {
452 ERR("no kernel image specified");
456 ret = get_file_stat(&kernel_info);
460 kernel_len = kernel_info.file_size;
463 if (kernel_info.file_size >
464 layout->fw_max_len - sizeof(struct fw_header)) {
465 ERR("kernel image is too big");
469 if (rootfs_info.file_name == NULL) {
470 ERR("no rootfs image specified");
474 ret = get_file_stat(&rootfs_info);
479 kernel_len += sizeof(struct fw_header);
480 kernel_len = ALIGN(kernel_len, rootfs_align);
481 kernel_len -= sizeof(struct fw_header);
483 DBG("kernel length aligned to %u", kernel_len);
485 if (kernel_len + rootfs_info.file_size >
486 layout->fw_max_len - sizeof(struct fw_header)) {
487 ERR("images are too big");
491 if (kernel_info.file_size >
492 rootfs_ofs - sizeof(struct fw_header)) {
493 ERR("kernel image is too big");
497 if (rootfs_info.file_size >
498 (layout->fw_max_len - rootfs_ofs)) {
499 ERR("rootfs image is too big");
505 if (ofname == NULL) {
506 ERR("no output file specified");
510 ret = sscanf(fw_ver, "%d.%d.%d", &fw_ver_hi, &fw_ver_mid, &fw_ver_lo);
512 ERR("invalid firmware version '%s'", fw_ver);
516 ret = sscanf(sver, "%d.%d", &sver_hi, &sver_lo);
518 ERR("invalid secondary version '%s'", sver);
525 static void fill_header(char *buf, int len)
527 struct fw_header *hdr = (struct fw_header *)buf;
530 memset(hdr, '\xff', sizeof(struct fw_header));
532 hdr->version = htonl(bswap_32(hdr_ver));
533 ver_len = strlen(version);
534 if (ver_len > (sizeof(hdr->fw_version) - 1))
535 ver_len = sizeof(hdr->fw_version) - 1;
537 memcpy(hdr->fw_version, version, ver_len);
538 hdr->fw_version[ver_len] = 0;
540 hdr->hw_id = htonl(board->hw_id);
541 hdr->hw_rev = htonl(board->hw_rev);
542 hdr->hw_ver_add = htonl(board->hw_ver_add);
544 if (boot_info.file_size == 0) {
545 memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
546 hdr->boot_ofs = htonl(0);
547 hdr->boot_len = htonl(0);
549 memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
550 hdr->boot_ofs = htonl(rootfs_ofs + rootfs_info.file_size);
551 hdr->boot_len = htonl(rootfs_info.file_size);
554 hdr->kernel_la = htonl(kernel_la);
555 hdr->kernel_ep = htonl(kernel_ep);
556 hdr->fw_length = htonl(layout->fw_max_len);
557 hdr->kernel_ofs = htonl(sizeof(struct fw_header));
558 hdr->kernel_len = htonl(kernel_len);
560 hdr->rootfs_ofs = htonl(rootfs_ofs);
561 hdr->rootfs_len = htonl(rootfs_info.file_size);
564 hdr->boot_ofs = htonl(0);
565 hdr->boot_len = htonl(boot_info.file_size);
567 hdr->unk2 = htonl(0);
568 hdr->unk3 = htonl(0xffffffff);
569 hdr->unk4 = htons(0x55aa);
572 hdr->sver_hi = sver_hi;
573 hdr->sver_lo = sver_lo;
575 hdr->ver_hi = fw_ver_hi;
576 hdr->ver_mid = fw_ver_mid;
577 hdr->ver_lo = fw_ver_lo;
579 if (board->flags & FLAG_LE_KERNEL_LA_EP) {
580 hdr->kernel_la = bswap_32(hdr->kernel_la);
581 hdr->kernel_ep = bswap_32(hdr->kernel_ep);
584 get_md5(buf, len, hdr->md5sum1);
587 static int pad_jffs2(char *buf, int currlen)
593 pad_mask = (64 * 1024);
594 while ((len < layout->fw_max_len) && (pad_mask != 0)) {
598 for (i = 10; i < 32; i++) {
604 len = ALIGN(len, mask);
606 for (i = 10; i < 32; i++) {
608 if ((len & (mask - 1)) == 0)
612 for (i = 0; i < sizeof(jffs2_eof_mark); i++)
613 buf[len + i] = jffs2_eof_mark[i];
615 len += sizeof(jffs2_eof_mark);
621 static int write_fw(char *data, int len)
624 int ret = EXIT_FAILURE;
626 f = fopen(ofname, "w");
628 ERRS("could not open \"%s\" for writing", ofname);
633 fwrite(data, len, 1, f);
635 ERRS("unable to write output file");
639 DBG("firmware file \"%s\" completed", ofname);
646 if (ret != EXIT_SUCCESS) {
653 static int build_fw(void)
658 int ret = EXIT_FAILURE;
661 buflen = layout->fw_max_len;
663 buf = malloc(buflen);
665 ERR("no memory for buffer\n");
669 memset(buf, 0xff, buflen);
670 p = buf + sizeof(struct fw_header);
671 ret = read_to_buf(&kernel_info, p);
675 writelen = sizeof(struct fw_header) + kernel_len;
681 p = buf + rootfs_ofs;
683 ret = read_to_buf(&rootfs_info, p);
688 writelen += rootfs_info.file_size;
690 writelen = rootfs_ofs + rootfs_info.file_size;
693 writelen = pad_jffs2(buf, writelen);
699 fill_header(buf, writelen);
700 ret = write_fw(buf, writelen);
712 /* Helper functions to inspect_fw() representing different output formats */
713 static inline void inspect_fw_pstr(char *label, char *str)
715 printf("%-23s: %s\n", label, str);
718 static inline void inspect_fw_phex(char *label, uint32_t val)
720 printf("%-23s: 0x%08x\n", label, val);
723 static inline void inspect_fw_phexpost(char *label,
724 uint32_t val, char *post)
726 printf("%-23s: 0x%08x (%s)\n", label, val, post);
729 static inline void inspect_fw_phexdef(char *label,
730 uint32_t val, uint32_t defval)
732 printf("%-23s: 0x%08x ", label, val);
735 printf("(== OpenWrt default)\n");
737 printf("(OpenWrt default: 0x%08x)\n", defval);
740 static inline void inspect_fw_phexexp(char *label,
741 uint32_t val, uint32_t expval)
743 printf("%-23s: 0x%08x ", label, val);
748 printf("(expected: 0x%08x)\n", expval);
751 static inline void inspect_fw_phexdec(char *label, uint32_t val)
753 printf("%-23s: 0x%08x / %8u bytes\n", label, val, val);
756 static inline void inspect_fw_phexdecdef(char *label,
757 uint32_t val, uint32_t defval)
759 printf("%-23s: 0x%08x / %8u bytes ", label, val, val);
762 printf("(== OpenWrt default)\n");
764 printf("(OpenWrt default: 0x%08x)\n", defval);
767 static inline void inspect_fw_pmd5sum(char *label, uint8_t *val, char *text)
771 printf("%-23s:", label);
772 for (i=0; i<MD5SUM_LEN; i++)
773 printf(" %02x", val[i]);
774 printf(" %s\n", text);
777 static int inspect_fw(void)
780 struct fw_header *hdr;
781 uint8_t md5sum[MD5SUM_LEN];
782 struct board_info *board;
783 int ret = EXIT_FAILURE;
785 buf = malloc(inspect_info.file_size);
787 ERR("no memory for buffer!\n");
791 ret = read_to_buf(&inspect_info, buf);
794 hdr = (struct fw_header *)buf;
796 board = find_board_by_hwid(ntohl(hdr->hw_id));
798 board = &custom_board;
800 if (board->flags & FLAG_LE_KERNEL_LA_EP) {
801 hdr->kernel_la = bswap_32(hdr->kernel_la);
802 hdr->kernel_ep = bswap_32(hdr->kernel_ep);
805 inspect_fw_pstr("File name", inspect_info.file_name);
806 inspect_fw_phexdec("File size", inspect_info.file_size);
808 switch(bswap_32(ntohl(hdr->version))) {
813 ERR("file does not seem to have V2/V3 header!\n");
817 inspect_fw_phexdec("Version 2 Header size", sizeof(struct fw_header));
819 memcpy(md5sum, hdr->md5sum1, sizeof(md5sum));
820 if (ntohl(hdr->boot_len) == 0)
821 memcpy(hdr->md5sum1, md5salt_normal, sizeof(md5sum));
823 memcpy(hdr->md5sum1, md5salt_boot, sizeof(md5sum));
824 get_md5(buf, inspect_info.file_size, hdr->md5sum1);
826 if (memcmp(md5sum, hdr->md5sum1, sizeof(md5sum))) {
827 inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(*ERROR*)");
828 inspect_fw_pmd5sum(" --> expected", hdr->md5sum1, "");
830 inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(ok)");
832 if (ntohl(hdr->unk2) != 0)
833 inspect_fw_phexdec("Unknown value 2", hdr->unk2);
834 inspect_fw_pmd5sum("Header MD5Sum2", hdr->md5sum2,
835 "(purpose yet unknown, unchecked here)");
837 if (ntohl(hdr->unk3) != 0xffffffff)
838 inspect_fw_phexdec("Unknown value 3", hdr->unk3);
840 if (ntohs(hdr->unk4) != 0x55aa)
841 inspect_fw_phexdec("Unknown value 4", hdr->unk4);
843 if (hdr->unk5 != 0xa5)
844 inspect_fw_phexdec("Unknown value 5", hdr->unk5);
848 inspect_fw_pstr("Firmware version", hdr->fw_version);
850 if (board != &custom_board) {
851 layout = find_layout(board->layout_id);
852 inspect_fw_phexpost("Hardware ID",
853 ntohl(hdr->hw_id), board->id);
854 inspect_fw_phexexp("Hardware Revision",
855 ntohl(hdr->hw_rev), board->hw_rev);
856 inspect_fw_phexexp("Additional HW Version",
857 ntohl(hdr->hw_ver_add), board->hw_ver_add);
859 inspect_fw_phexpost("Hardware ID",
860 ntohl(hdr->hw_id), "unknown");
861 inspect_fw_phex("Hardware Revision",
863 inspect_fw_phex("Additional HW Version",
864 ntohl(hdr->hw_ver_add));
867 printf("%-23s: %d.%d.%d-%d.%d\n", "Software version",
868 hdr->ver_hi, hdr->ver_mid, hdr->ver_lo,
869 hdr->sver_hi, hdr->sver_lo);
873 inspect_fw_phexdec("Kernel data offset",
874 ntohl(hdr->kernel_ofs));
875 inspect_fw_phexdec("Kernel data length",
876 ntohl(hdr->kernel_len));
877 if (board != &custom_board) {
878 inspect_fw_phexdef("Kernel load address",
879 ntohl(hdr->kernel_la),
880 layout ? layout->kernel_la : 0xffffffff);
881 inspect_fw_phexdef("Kernel entry point",
882 ntohl(hdr->kernel_ep),
883 layout ? layout->kernel_ep : 0xffffffff);
884 inspect_fw_phexdecdef("Rootfs data offset",
885 ntohl(hdr->rootfs_ofs),
886 layout ? layout->rootfs_ofs : 0xffffffff);
888 inspect_fw_phex("Kernel load address",
889 ntohl(hdr->kernel_la));
890 inspect_fw_phex("Kernel entry point",
891 ntohl(hdr->kernel_ep));
892 inspect_fw_phexdec("Rootfs data offset",
893 ntohl(hdr->rootfs_ofs));
895 inspect_fw_phexdec("Rootfs data length",
896 ntohl(hdr->rootfs_len));
897 inspect_fw_phexdec("Boot loader data offset",
898 ntohl(hdr->boot_ofs));
899 inspect_fw_phexdec("Boot loader data length",
900 ntohl(hdr->boot_len));
901 inspect_fw_phexdec("Total firmware length",
902 ntohl(hdr->fw_length));
910 filename = malloc(strlen(inspect_info.file_name) + 8);
911 sprintf(filename, "%s-kernel", inspect_info.file_name);
912 printf("Extracting kernel to \"%s\"...\n", filename);
913 fp = fopen(filename, "w");
915 if (!fwrite(buf + ntohl(hdr->kernel_ofs),
916 ntohl(hdr->kernel_len), 1, fp)) {
917 ERR("error in fwrite(): %s", strerror(errno));
921 ERR("error in fopen(): %s", strerror(errno));
925 filename = malloc(strlen(inspect_info.file_name) + 8);
926 sprintf(filename, "%s-rootfs", inspect_info.file_name);
927 printf("Extracting rootfs to \"%s\"...\n", filename);
928 fp = fopen(filename, "w");
930 if (!fwrite(buf + ntohl(hdr->rootfs_ofs),
931 ntohl(hdr->rootfs_len), 1, fp)) {
932 ERR("error in fwrite(): %s", strerror(errno));
936 ERR("error in fopen(): %s", strerror(errno));
947 int main(int argc, char *argv[])
949 int ret = EXIT_FAILURE;
954 progname = basename(argv[0]);
959 c = getopt(argc, argv, "a:B:H:E:F:L:V:N:W:w:ci:k:r:R:o:xhsjv:y:T:e");
965 sscanf(optarg, "0x%x", &rootfs_align);
974 sscanf(optarg, "0x%x", &kernel_ep);
983 opt_hw_ver_add = optarg;
986 sscanf(optarg, "0x%x", &kernel_la);
1004 kernel_info.file_name = optarg;
1007 rootfs_info.file_name = optarg;
1010 sscanf(optarg, "0x%x", &rootfs_ofs);
1019 inspect_info.file_name = optarg;
1028 hdr_ver = atoi(optarg);
1031 custom_board.flags = FLAG_LE_KERNEL_LA_EP;
1034 usage(EXIT_SUCCESS);
1037 usage(EXIT_FAILURE);
1042 ret = check_options();
1046 if (!inspect_info.file_name)