firmware-utils: add a tool TP-Link v2 image generation
authorJohn Crispin <john@openwrt.org>
Tue, 6 Aug 2013 16:25:35 +0000 (16:25 +0000)
committerJohn Crispin <john@openwrt.org>
Tue, 6 Aug 2013 16:25:35 +0000 (16:25 +0000)
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 37726

tools/firmware-utils/Makefile
tools/firmware-utils/src/mktplinkfw2.c [new file with mode: 0644]

index c0d577e..45690f5 100644 (file)
@@ -40,6 +40,7 @@ define Host/Compile
        $(call cc,nand_ecc)
        $(call cc,mkplanexfw sha1)
        $(call cc,mktplinkfw md5)
+       $(call cc,mktplinkfw2 md5)
        $(call cc,pc1crypt)
        $(call cc,osbridge-crc)
        $(call cc,wrt400n cyg_crc32)
diff --git a/tools/firmware-utils/src/mktplinkfw2.c b/tools/firmware-utils/src/mktplinkfw2.c
new file mode 100644 (file)
index 0000000..df64ac3
--- /dev/null
@@ -0,0 +1,944 @@
+/*
+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This tool was based on:
+ *   TP-Link WR941 V2 firmware checksum fixing tool.
+ *   Copyright (C) 2008,2009 Wang Jian <lark@linux.net.cn>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>     /* for unlink() */
+#include <libgen.h>
+#include <getopt.h>     /* for getopt() */
+#include <stdarg.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#include "md5.h"
+
+#define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })
+
+#define HEADER_VERSION_V2      0x02000000
+
+#define HWID_TD_W8970_V1               0x89700001
+
+#define MD5SUM_LEN     16
+
+struct file_info {
+       char            *file_name;     /* name of the file */
+       uint32_t        file_size;      /* length of the file */
+};
+
+struct fw_header {
+       uint32_t        version;        /* 0x00: header version */
+       char            fw_version[48]; /* 0x04: fw version string */
+       uint32_t        hw_id;          /* 0x34: hardware id */
+       uint32_t        hw_rev;         /* 0x38: FIXME: hardware revision? */
+       uint32_t        unk1;           /* 0x3c: 0x00000000 */
+       uint8_t         md5sum1[MD5SUM_LEN]; /* 0x40 */
+       uint32_t        unk2;           /* 0x50: 0x00000000 */
+       uint8_t         md5sum2[MD5SUM_LEN]; /* 0x54 */
+       uint32_t        unk3;           /* 0x64: 0xffffffff */
+
+       uint32_t        kernel_la;      /* 0x68: kernel load address */
+       uint32_t        kernel_ep;      /* 0x6c: kernel entry point */
+       uint32_t        fw_length;      /* 0x70: total length of the image */
+       uint32_t        kernel_ofs;     /* 0x74: kernel data offset */
+       uint32_t        kernel_len;     /* 0x78: kernel data length */
+       uint32_t        rootfs_ofs;     /* 0x7c: rootfs data offset */
+       uint32_t        rootfs_len;     /* 0x80: rootfs data length */
+       uint32_t        boot_ofs;       /* 0x84: FIXME: seems to be unused */
+       uint32_t        boot_len;       /* 0x88: FIXME: seems to be unused */
+       uint16_t        unk4;           /* 0x8c: 0x55aa */
+       uint8_t         sver_hi;        /* 0x8e */
+       uint8_t         sver_lo;        /* 0x8f */
+       uint8_t         unk5;           /* 0x90: magic: 0xa5 */
+       uint8_t         ver_hi;         /* 0x91 */
+       uint8_t         ver_mid;        /* 0x92 */
+       uint8_t         ver_lo;         /* 0x93 */
+       uint8_t         pad[364];
+} __attribute__ ((packed));
+
+struct flash_layout {
+       char            *id;
+       uint32_t        fw_max_len;
+       uint32_t        kernel_la;
+       uint32_t        kernel_ep;
+       uint32_t        rootfs_ofs;
+};
+
+struct board_info {
+       char            *id;
+       uint32_t        hw_id;
+       uint32_t        hw_rev;
+       char            *layout_id;
+};
+
+/*
+ * Globals
+ */
+static char *ofname;
+static char *progname;
+static char *vendor = "TP-LINK Technologies";
+static char *version = "ver. 1.0";
+static char *fw_ver = "0.0.0";
+static char *sver = "1.0";
+
+static char *board_id;
+static struct board_info *board;
+static char *layout_id;
+static struct flash_layout *layout;
+static char *opt_hw_id;
+static uint32_t hw_id;
+static char *opt_hw_rev;
+static uint32_t hw_rev;
+static int fw_ver_lo;
+static int fw_ver_mid;
+static int fw_ver_hi;
+static int sver_lo;
+static int sver_hi;
+static struct file_info kernel_info;
+static uint32_t kernel_la = 0;
+static uint32_t kernel_ep = 0;
+static uint32_t kernel_len = 0;
+static struct file_info rootfs_info;
+static uint32_t rootfs_ofs = 0;
+static uint32_t rootfs_align;
+static struct file_info boot_info;
+static int combined;
+static int strip_padding;
+static int add_jffs2_eof;
+static unsigned char jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
+
+static struct file_info inspect_info;
+static int extract = 0;
+
+char md5salt_normal[MD5SUM_LEN] = {
+       0xdc, 0xd7, 0x3a, 0xa5, 0xc3, 0x95, 0x98, 0xfb,
+       0xdc, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x37,
+};
+
+char md5salt_boot[MD5SUM_LEN] = {
+       0x8c, 0xef, 0x33, 0x5b, 0xd5, 0xc5, 0xce, 0xfa,
+       0xa7, 0x9c, 0x28, 0xda, 0xb2, 0xe9, 0x0f, 0x42,
+};
+
+static struct flash_layout layouts[] = {
+       {
+               .id             = "8Mltq",
+               .fw_max_len     = 0x7a0000,
+               .kernel_la      = 0x80002000,
+               .kernel_ep      = 0x80002000,
+               .rootfs_ofs     = 0x140000,
+       }, {
+               /* terminating entry */
+       }
+};
+
+static struct board_info boards[] = {
+       {
+               .id             = "TD-W8970v1",
+               .hw_id          = HWID_TD_W8970_V1,
+               .hw_rev         = 1,
+               .layout_id      = "8Mltq",
+       }, {
+               /* terminating entry */
+       }
+};
+
+/*
+ * Message macros
+ */
+#define ERR(fmt, ...) do { \
+       fflush(0); \
+       fprintf(stderr, "[%s] *** error: " fmt "\n", \
+                       progname, ## __VA_ARGS__ ); \
+} while (0)
+
+#define ERRS(fmt, ...) do { \
+       int save = errno; \
+       fflush(0); \
+       fprintf(stderr, "[%s] *** error: " fmt "\n", \
+                       progname, ## __VA_ARGS__, strerror(save)); \
+} while (0)
+
+#define DBG(fmt, ...) do { \
+       fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
+} while (0)
+
+static struct board_info *find_board(char *id)
+{
+       struct board_info *ret;
+       struct board_info *board;
+
+       ret = NULL;
+       for (board = boards; board->id != NULL; board++){
+               if (strcasecmp(id, board->id) == 0) {
+                       ret = board;
+                       break;
+               }
+       };
+
+       return ret;
+}
+
+static struct board_info *find_board_by_hwid(uint32_t hw_id)
+{
+       struct board_info *board;
+
+       for (board = boards; board->id != NULL; board++) {
+               if (hw_id == board->hw_id)
+                       return board;
+       };
+
+       return NULL;
+}
+
+static struct flash_layout *find_layout(char *id)
+{
+       struct flash_layout *ret;
+       struct flash_layout *l;
+
+       ret = NULL;
+       for (l = layouts; l->id != NULL; l++){
+               if (strcasecmp(id, l->id) == 0) {
+                       ret = l;
+                       break;
+               }
+       };
+
+       return ret;
+}
+
+static void usage(int status)
+{
+       FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
+       struct board_info *board;
+
+       fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
+       fprintf(stream,
+"\n"
+"Options:\n"
+"  -B <board>      create image for the board specified with <board>\n"
+"  -c              use combined kernel image\n"
+"  -E <ep>         overwrite kernel entry point with <ep> (hexval prefixed with 0x)\n"
+"  -L <la>         overwrite kernel load address with <la> (hexval prefixed with 0x)\n"
+"  -H <hwid>       use hardware id specified with <hwid>\n"
+"  -W <hwrev>      use hardware revision specified with <hwrev>\n"
+"  -F <id>         use flash layout specified with <id>\n"
+"  -k <file>       read kernel image from the file <file>\n"
+"  -r <file>       read rootfs image from the file <file>\n"
+"  -a <align>      align the rootfs start on an <align> bytes boundary\n"
+"  -R <offset>     overwrite rootfs offset with <offset> (hexval prefixed with 0x)\n"
+"  -o <file>       write output to the file <file>\n"
+"  -s              strip padding from the end of the image\n"
+"  -j              add jffs2 end-of-filesystem markers\n"
+"  -V <version>    set image version to <version>\n"
+"  -v <version>    set firmware version to <version>\n"
+"  -y <version>    set secondary version to <version>\n"
+"  -i <file>       inspect given firmware file <file>\n"
+"  -x              extract kernel and rootfs while inspecting (requires -i)\n"
+"  -h              show this screen\n"
+       );
+
+       exit(status);
+}
+
+static int get_md5(char *data, int size, char *md5)
+{
+       MD5_CTX ctx;
+
+       MD5_Init(&ctx);
+       MD5_Update(&ctx, data, size);
+       MD5_Final(md5, &ctx);
+}
+
+static int get_file_stat(struct file_info *fdata)
+{
+       struct stat st;
+       int res;
+
+       if (fdata->file_name == NULL)
+               return 0;
+
+       res = stat(fdata->file_name, &st);
+       if (res){
+               ERRS("stat failed on %s", fdata->file_name);
+               return res;
+       }
+
+       fdata->file_size = st.st_size;
+       return 0;
+}
+
+static int read_to_buf(struct file_info *fdata, char *buf)
+{
+       FILE *f;
+       int ret = EXIT_FAILURE;
+
+       f = fopen(fdata->file_name, "r");
+       if (f == NULL) {
+               ERRS("could not open \"%s\" for reading", fdata->file_name);
+               goto out;
+       }
+
+       errno = 0;
+       fread(buf, fdata->file_size, 1, f);
+       if (errno != 0) {
+               ERRS("unable to read from file \"%s\"", fdata->file_name);
+               goto out_close;
+       }
+
+       ret = EXIT_SUCCESS;
+
+ out_close:
+       fclose(f);
+ out:
+       return ret;
+}
+
+static int check_options(void)
+{
+       int ret;
+
+       if (inspect_info.file_name) {
+               ret = get_file_stat(&inspect_info);
+               if (ret)
+                       return ret;
+
+               return 0;
+       } else if (extract) {
+               ERR("no firmware for inspection specified");
+               return -1;
+       }
+
+       if (board_id == NULL && opt_hw_id == NULL) {
+               ERR("either board or hardware id must be specified");
+               return -1;
+       }
+
+       if (board_id) {
+               board = find_board(board_id);
+               if (board == NULL) {
+                       ERR("unknown/unsupported board id \"%s\"", board_id);
+                       return -1;
+               }
+               if (layout_id == NULL)
+                       layout_id = board->layout_id;
+
+               hw_id = board->hw_id;
+               hw_rev = board->hw_rev;
+       } else {
+               if (layout_id == NULL) {
+                       ERR("flash layout is not specified");
+                       return -1;
+               }
+               hw_id = strtoul(opt_hw_id, NULL, 0);
+
+               if (opt_hw_rev)
+                       hw_rev = strtoul(opt_hw_rev, NULL, 0);
+               else
+                       hw_rev = 1;
+       }
+
+       layout = find_layout(layout_id);
+       if (layout == NULL) {
+               ERR("unknown flash layout \"%s\"", layout_id);
+               return -1;
+       }
+
+       if (!kernel_la)
+               kernel_la = layout->kernel_la;
+       if (!kernel_ep)
+               kernel_ep = layout->kernel_ep;
+       if (!rootfs_ofs)
+               rootfs_ofs = layout->rootfs_ofs;
+
+       if (kernel_info.file_name == NULL) {
+               ERR("no kernel image specified");
+               return -1;
+       }
+
+       ret = get_file_stat(&kernel_info);
+       if (ret)
+               return ret;
+
+       kernel_len = kernel_info.file_size;
+
+       if (combined) {
+               if (kernel_info.file_size >
+                   layout->fw_max_len - sizeof(struct fw_header)) {
+                       ERR("kernel image is too big");
+                       return -1;
+               }
+       } else {
+               if (rootfs_info.file_name == NULL) {
+                       ERR("no rootfs image specified");
+                       return -1;
+               }
+
+               ret = get_file_stat(&rootfs_info);
+               if (ret)
+                       return ret;
+
+               if (rootfs_align) {
+                       kernel_len += sizeof(struct fw_header);
+                       kernel_len = ALIGN(kernel_len, rootfs_align);
+                       kernel_len -= sizeof(struct fw_header);
+
+                       DBG("kernel length aligned to %u", kernel_len);
+
+                       if (kernel_len + rootfs_info.file_size >
+                           layout->fw_max_len - sizeof(struct fw_header)) {
+                               ERR("images are too big");
+                               return -1;
+                       }
+               } else {
+                       if (kernel_info.file_size >
+                           rootfs_ofs - sizeof(struct fw_header)) {
+                               ERR("kernel image is too big");
+                               return -1;
+                       }
+
+                       if (rootfs_info.file_size >
+                           (layout->fw_max_len - rootfs_ofs)) {
+                               ERR("rootfs image is too big");
+                               return -1;
+                       }
+               }
+       }
+
+       if (ofname == NULL) {
+               ERR("no output file specified");
+               return -1;
+       }
+
+       ret = sscanf(fw_ver, "%d.%d.%d", &fw_ver_hi, &fw_ver_mid, &fw_ver_lo);
+       if (ret != 3) {
+               ERR("invalid firmware version '%s'", fw_ver);
+               return -1;
+       }
+
+       ret = sscanf(sver, "%d.%d", &sver_hi, &sver_lo);
+       if (ret != 2) {
+               ERR("invalid secondary version '%s'", sver);
+               return -1;
+       }
+
+       return 0;
+}
+
+static void fill_header(char *buf, int len)
+{
+       struct fw_header *hdr = (struct fw_header *)buf;
+       unsigned ver_len;
+
+       memset(hdr, '\xff', sizeof(struct fw_header));
+
+       hdr->version = htonl(HEADER_VERSION_V2);
+       ver_len = strlen(version);
+       if (ver_len > (sizeof(hdr->fw_version) - 1))
+               ver_len = sizeof(hdr->fw_version) - 1;
+
+       memcpy(hdr->fw_version, version, ver_len);
+       hdr->fw_version[ver_len] = 0;
+
+       hdr->hw_id = htonl(hw_id);
+       hdr->hw_rev = htonl(hw_rev);
+
+       if (boot_info.file_size == 0) {
+               memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
+               hdr->boot_ofs = htonl(0);
+               hdr->boot_len = htonl(0);
+       } else {
+               memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
+               hdr->boot_ofs = htonl(rootfs_ofs + rootfs_info.file_size);
+               hdr->boot_len = htonl(rootfs_info.file_size);
+       }
+
+       hdr->kernel_la = htonl(kernel_la);
+       hdr->kernel_ep = htonl(kernel_ep);
+       hdr->fw_length = htonl(layout->fw_max_len);
+       hdr->kernel_ofs = htonl(sizeof(struct fw_header));
+       hdr->kernel_len = htonl(kernel_len);
+       if (!combined) {
+               hdr->rootfs_ofs = htonl(rootfs_ofs);
+               hdr->rootfs_len = htonl(rootfs_info.file_size);
+       }
+
+       hdr->boot_ofs = htonl(0);
+       hdr->boot_len = htonl(boot_info.file_size);
+
+       hdr->unk1 = htonl(0);
+       hdr->unk2 = htonl(0);
+       hdr->unk3 = htonl(0xffffffff);
+       hdr->unk4 = htons(0x55aa);
+       hdr->unk5 = 0xa5;
+
+       hdr->sver_hi = sver_hi;
+       hdr->sver_lo = sver_lo;
+
+       hdr->ver_hi = fw_ver_hi;
+       hdr->ver_mid = fw_ver_mid;
+       hdr->ver_lo = fw_ver_lo;
+
+       get_md5(buf, len, hdr->md5sum1);
+}
+
+static int pad_jffs2(char *buf, int currlen)
+{
+       int len;
+       uint32_t pad_mask;
+
+       len = currlen;
+       pad_mask = (64 * 1024);
+       while ((len < layout->fw_max_len) && (pad_mask != 0)) {
+               uint32_t mask;
+               int i;
+
+               for (i = 10; i < 32; i++) {
+                       mask = 1 << i;
+                       if (pad_mask & mask)
+                               break;
+               }
+
+               len = ALIGN(len, mask);
+
+               for (i = 10; i < 32; i++) {
+                       mask = 1 << i;
+                       if ((len & (mask - 1)) == 0)
+                               pad_mask &= ~mask;
+               }
+
+               for (i = 0; i < sizeof(jffs2_eof_mark); i++)
+                       buf[len + i] = jffs2_eof_mark[i];
+
+               len += sizeof(jffs2_eof_mark);
+       }
+
+       return len;
+}
+
+static int write_fw(char *data, int len)
+{
+       FILE *f;
+       int ret = EXIT_FAILURE;
+
+       f = fopen(ofname, "w");
+       if (f == NULL) {
+               ERRS("could not open \"%s\" for writing", ofname);
+               goto out;
+       }
+
+       errno = 0;
+       fwrite(data, len, 1, f);
+       if (errno) {
+               ERRS("unable to write output file");
+               goto out_flush;
+       }
+
+       DBG("firmware file \"%s\" completed", ofname);
+
+       ret = EXIT_SUCCESS;
+
+ out_flush:
+       fflush(f);
+       fclose(f);
+       if (ret != EXIT_SUCCESS) {
+               unlink(ofname);
+       }
+ out:
+       return ret;
+}
+
+static int build_fw(void)
+{
+       int buflen;
+       char *buf;
+       char *p;
+       int ret = EXIT_FAILURE;
+       int writelen = 0;
+
+       buflen = layout->fw_max_len;
+
+       buf = malloc(buflen);
+       if (!buf) {
+               ERR("no memory for buffer\n");
+               goto out;
+       }
+
+       memset(buf, 0xff, buflen);
+       p = buf + sizeof(struct fw_header);
+       ret = read_to_buf(&kernel_info, p);
+       if (ret)
+               goto out_free_buf;
+
+       writelen = sizeof(struct fw_header) + kernel_len;
+
+       if (!combined) {
+               if (rootfs_align)
+                       p = buf + writelen;
+               else
+                       p = buf + rootfs_ofs;
+
+               ret = read_to_buf(&rootfs_info, p);
+               if (ret)
+                       goto out_free_buf;
+
+               if (rootfs_align)
+                       writelen += rootfs_info.file_size;
+               else
+                       writelen = rootfs_ofs + rootfs_info.file_size;
+
+               if (add_jffs2_eof)
+                       writelen = pad_jffs2(buf, writelen);
+       }
+
+       if (!strip_padding)
+               writelen = buflen;
+
+       fill_header(buf, writelen);
+       ret = write_fw(buf, writelen);
+       if (ret)
+               goto out_free_buf;
+
+       ret = EXIT_SUCCESS;
+
+ out_free_buf:
+       free(buf);
+ out:
+       return ret;
+}
+
+/* Helper functions to inspect_fw() representing different output formats */
+static inline void inspect_fw_pstr(char *label, char *str)
+{
+       printf("%-23s: %s\n", label, str);
+}
+
+static inline void inspect_fw_phex(char *label, uint32_t val)
+{
+       printf("%-23s: 0x%08x\n", label, val);
+}
+
+static inline void inspect_fw_phexpost(char *label,
+                                       uint32_t val, char *post)
+{
+       printf("%-23s: 0x%08x (%s)\n", label, val, post);
+}
+
+static inline void inspect_fw_phexdef(char *label,
+                                      uint32_t val, uint32_t defval)
+{
+       printf("%-23s: 0x%08x                  ", label, val);
+
+       if (val == defval)
+               printf("(== OpenWrt default)\n");
+       else
+               printf("(OpenWrt default: 0x%08x)\n", defval);
+}
+
+static inline void inspect_fw_phexexp(char *label,
+                                      uint32_t val, uint32_t expval)
+{
+       printf("%-23s: 0x%08x ", label, val);
+
+       if (val == expval)
+               printf("(ok)\n");
+       else
+               printf("(expected: 0x%08x)\n", expval);
+}
+
+static inline void inspect_fw_phexdec(char *label, uint32_t val)
+{
+       printf("%-23s: 0x%08x / %8u bytes\n", label, val, val);
+}
+
+static inline void inspect_fw_phexdecdef(char *label,
+                                         uint32_t val, uint32_t defval)
+{
+       printf("%-23s: 0x%08x / %8u bytes ", label, val, val);
+
+       if (val == defval)
+               printf("(== OpenWrt default)\n");
+       else
+               printf("(OpenWrt default: 0x%08x)\n", defval);
+}
+
+static inline void inspect_fw_pmd5sum(char *label, uint8_t *val, char *text)
+{
+       int i;
+
+       printf("%-23s:", label);
+       for (i=0; i<MD5SUM_LEN; i++)
+               printf(" %02x", val[i]);
+       printf(" %s\n", text);
+}
+
+static int inspect_fw(void)
+{
+       char *buf;
+       struct fw_header *hdr;
+       uint8_t md5sum[MD5SUM_LEN];
+       struct board_info *board;
+       int ret = EXIT_FAILURE;
+
+       buf = malloc(inspect_info.file_size);
+       if (!buf) {
+               ERR("no memory for buffer!\n");
+               goto out;
+       }
+
+       ret = read_to_buf(&inspect_info, buf);
+       if (ret)
+               goto out_free_buf;
+       hdr = (struct fw_header *)buf;
+
+       inspect_fw_pstr("File name", inspect_info.file_name);
+       inspect_fw_phexdec("File size", inspect_info.file_size);
+
+       if (ntohl(hdr->version) != HEADER_VERSION_V2) {
+               ERR("file does not seem to have V2 header!\n");
+               goto out_free_buf;
+       }
+
+       inspect_fw_phexdec("Version 2 Header size", sizeof(struct fw_header));
+
+       if (ntohl(hdr->unk1) != 0)
+               inspect_fw_phexdec("Unknown value 1", hdr->unk1);
+
+       memcpy(md5sum, hdr->md5sum1, sizeof(md5sum));
+       if (ntohl(hdr->boot_len) == 0)
+               memcpy(hdr->md5sum1, md5salt_normal, sizeof(md5sum));
+       else
+               memcpy(hdr->md5sum1, md5salt_boot, sizeof(md5sum));
+       get_md5(buf, inspect_info.file_size, hdr->md5sum1);
+
+       if (memcmp(md5sum, hdr->md5sum1, sizeof(md5sum))) {
+               inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(*ERROR*)");
+               inspect_fw_pmd5sum("          --> expected", hdr->md5sum1, "");
+       } else {
+               inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(ok)");
+       }
+       if (ntohl(hdr->unk2) != 0)
+               inspect_fw_phexdec("Unknown value 2", hdr->unk2);
+       inspect_fw_pmd5sum("Header MD5Sum2", hdr->md5sum2,
+                          "(purpose yet unknown, unchecked here)");
+
+       if (ntohl(hdr->unk3) != 0xffffffff)
+               inspect_fw_phexdec("Unknown value 3", hdr->unk3);
+
+       if (ntohs(hdr->unk4) != 0x55aa)
+               inspect_fw_phexdec("Unknown value 4", hdr->unk4);
+
+       if (hdr->unk5 != 0xa5)
+               inspect_fw_phexdec("Unknown value 5", hdr->unk5);
+
+       printf("\n");
+
+       inspect_fw_pstr("Firmware version", hdr->fw_version);
+
+       board = find_board_by_hwid(ntohl(hdr->hw_id));
+       if (board) {
+               layout = find_layout(board->layout_id);
+               inspect_fw_phexpost("Hardware ID",
+                                   ntohl(hdr->hw_id), board->id);
+               inspect_fw_phexexp("Hardware Revision",
+                                  ntohl(hdr->hw_rev), board->hw_rev);
+       } else {
+               inspect_fw_phexpost("Hardware ID",
+                                   ntohl(hdr->hw_id), "unknown");
+               inspect_fw_phex("Hardware Revision",
+                               ntohl(hdr->hw_rev));
+       }
+
+       printf("%-23s: %d.%d.%d-%d.%d\n", "Software version",
+              hdr->ver_hi, hdr->ver_mid, hdr->ver_lo,
+              hdr->sver_hi, hdr->sver_lo);
+
+       printf("\n");
+
+       inspect_fw_phexdec("Kernel data offset",
+                          ntohl(hdr->kernel_ofs));
+       inspect_fw_phexdec("Kernel data length",
+                          ntohl(hdr->kernel_len));
+       if (board) {
+               inspect_fw_phexdef("Kernel load address",
+                                  ntohl(hdr->kernel_la),
+                                  layout ? layout->kernel_la : 0xffffffff);
+               inspect_fw_phexdef("Kernel entry point",
+                                  ntohl(hdr->kernel_ep),
+                                  layout ? layout->kernel_ep : 0xffffffff);
+               inspect_fw_phexdecdef("Rootfs data offset",
+                                     ntohl(hdr->rootfs_ofs),
+                                     layout ? layout->rootfs_ofs : 0xffffffff);
+       } else {
+               inspect_fw_phex("Kernel load address",
+                               ntohl(hdr->kernel_la));
+               inspect_fw_phex("Kernel entry point",
+                               ntohl(hdr->kernel_ep));
+               inspect_fw_phexdec("Rootfs data offset",
+                                  ntohl(hdr->rootfs_ofs));
+       }
+       inspect_fw_phexdec("Rootfs data length",
+                          ntohl(hdr->rootfs_len));
+       inspect_fw_phexdec("Boot loader data offset",
+                          ntohl(hdr->boot_ofs));
+       inspect_fw_phexdec("Boot loader data length",
+                          ntohl(hdr->boot_len));
+       inspect_fw_phexdec("Total firmware length",
+                          ntohl(hdr->fw_length));
+
+       if (extract) {
+               FILE *fp;
+               char *filename;
+
+               printf("\n");
+
+               filename = malloc(strlen(inspect_info.file_name) + 8);
+               sprintf(filename, "%s-kernel", inspect_info.file_name);
+               printf("Extracting kernel to \"%s\"...\n", filename);
+               fp = fopen(filename, "w");
+               if (fp) {
+                       if (!fwrite(buf + ntohl(hdr->kernel_ofs),
+                                   ntohl(hdr->kernel_len), 1, fp)) {
+                               ERR("error in fwrite(): %s", strerror(errno));
+                       }
+                       fclose(fp);
+               } else {
+                       ERR("error in fopen(): %s", strerror(errno));
+               }
+               free(filename);
+
+               filename = malloc(strlen(inspect_info.file_name) + 8);
+               sprintf(filename, "%s-rootfs", inspect_info.file_name);
+               printf("Extracting rootfs to \"%s\"...\n", filename);
+               fp = fopen(filename, "w");
+               if (fp) {
+                       if (!fwrite(buf + ntohl(hdr->rootfs_ofs),
+                                   ntohl(hdr->rootfs_len), 1, fp)) {
+                               ERR("error in fwrite(): %s", strerror(errno));
+                       }
+                       fclose(fp);
+               } else {
+                       ERR("error in fopen(): %s", strerror(errno));
+               }
+               free(filename);
+       }
+
+ out_free_buf:
+       free(buf);
+ out:
+       return ret;
+}
+
+int main(int argc, char *argv[])
+{
+       int ret = EXIT_FAILURE;
+       int err;
+
+       FILE *outfile;
+
+       progname = basename(argv[0]);
+
+       while ( 1 ) {
+               int c;
+
+               c = getopt(argc, argv, "a:B:H:E:F:L:V:N:W:ci:k:r:R:o:xhsjv:y:");
+               if (c == -1)
+                       break;
+
+               switch (c) {
+               case 'a':
+                       sscanf(optarg, "0x%x", &rootfs_align);
+                       break;
+               case 'B':
+                       board_id = optarg;
+                       break;
+               case 'H':
+                       opt_hw_id = optarg;
+                       break;
+               case 'E':
+                       sscanf(optarg, "0x%x", &kernel_ep);
+                       break;
+               case 'F':
+                       layout_id = optarg;
+                       break;
+               case 'W':
+                       opt_hw_rev = optarg;
+                       break;
+               case 'L':
+                       sscanf(optarg, "0x%x", &kernel_la);
+                       break;
+               case 'V':
+                       version = optarg;
+                       break;
+               case 'v':
+                       fw_ver = optarg;
+                       break;
+               case 'y':
+                       sver = optarg;
+                       break;
+               case 'N':
+                       vendor = optarg;
+                       break;
+               case 'c':
+                       combined++;
+                       break;
+               case 'k':
+                       kernel_info.file_name = optarg;
+                       break;
+               case 'r':
+                       rootfs_info.file_name = optarg;
+                       break;
+               case 'R':
+                       sscanf(optarg, "0x%x", &rootfs_ofs);
+                       break;
+               case 'o':
+                       ofname = optarg;
+                       break;
+               case 's':
+                       strip_padding = 1;
+                       break;
+               case 'i':
+                       inspect_info.file_name = optarg;
+                       break;
+               case 'j':
+                       add_jffs2_eof = 1;
+                       break;
+               case 'x':
+                       extract = 1;
+                       break;
+               case 'h':
+                       usage(EXIT_SUCCESS);
+                       break;
+               default:
+                       usage(EXIT_FAILURE);
+                       break;
+               }
+       }
+
+       ret = check_options();
+       if (ret)
+               goto out;
+
+       if (!inspect_info.file_name)
+               ret = build_fw();
+       else
+               ret = inspect_fw();
+
+ out:
+       return ret;
+}
+