/*
 * 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_V1    0x01000000
#define HWID_TL_MR3020_V1    0x30200001
#define HWID_TL_MR3220_V1    0x32200001
#define HWID_TL_MR3420_V1    0x34200001
#define HWID_TL_WA701N_V1    0x07010001
#define HWID_TL_WA7510N_V1    0x75100001
#define HWID_TL_WA901ND_V1    0x09010001
#define HWID_TL_WA901ND_V2    0x09010002
#define HWID_TL_WR703N_V1    0x07030101
#define HWID_TL_WR741ND_V1    0x07410001
#define HWID_TL_WR741ND_V4    0x07410004
#define HWID_TL_WR740N_V1    0x07400001
#define HWID_TL_WR740N_V3    0x07400003
#define HWID_TL_WR743ND_V1    0x07430001
#define HWID_TL_WR841N_V1_5    0x08410002
#define HWID_TL_WR841ND_V3    0x08410003
#define HWID_TL_WR841ND_V5    0x08410005
#define HWID_TL_WR841ND_V7    0x08410007
#define HWID_TL_WR941ND_V2    0x09410002
#define HWID_TL_WR941ND_V4    0x09410004
#define HWID_TL_WR1043ND_V1    0x10430001
#define HWID_TL_WR1041N_V2    0x10410002
#define HWID_TL_WR2543N_V1    0x25430001

#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;    /* header version */
    char        vendor_name[24];
    char        fw_version[36];
    uint32_t    hw_id;        /* hardware id */
    uint32_t    hw_rev;        /* hardware revision */
    uint32_t    unk1;
    uint8_t        md5sum1[MD5SUM_LEN];
    uint32_t    unk2;
    uint8_t        md5sum2[MD5SUM_LEN];
    uint32_t    unk3;
    uint32_t    kernel_la;    /* kernel load address */
    uint32_t    kernel_ep;    /* kernel entry point */
    uint32_t    fw_length;    /* total length of the firmware */
    uint32_t    kernel_ofs;    /* kernel data offset */
    uint32_t    kernel_len;    /* kernel data length */
    uint32_t    rootfs_ofs;    /* rootfs data offset */
    uint32_t    rootfs_len;    /* rootfs data length */
    uint32_t    boot_ofs;    /* bootloader data offset */
    uint32_t    boot_len;    /* bootloader data length */
    uint16_t    ver_hi;
    uint16_t    ver_mid;
    uint16_t    ver_lo;
    uint8_t        pad[354];
} __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 *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 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,
    0xdd, 0xf9, 0xe7, 0xf4, 0x0e, 0xae, 0x47, 0x38,
};

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        = "4M",
        .fw_max_len    = 0x3c0000,
        .kernel_la    = 0x80060000,
        .kernel_ep    = 0x80060000,
        .rootfs_ofs    = 0x140000,
    }, {
        .id        = "4Mlzma",
        .fw_max_len    = 0x3c0000,
        .kernel_la    = 0x80060000,
        .kernel_ep    = 0x80060000,
        .rootfs_ofs    = 0x100000,
    }, {
        .id        = "8M",
        .fw_max_len    = 0x7c0000,
        .kernel_la    = 0x80060000,
        .kernel_ep    = 0x80060000,
        .rootfs_ofs    = 0x140000,
    }, {
        .id        = "8Mlzma",
        .fw_max_len    = 0x7c0000,
        .kernel_la    = 0x80060000,
        .kernel_ep    = 0x80060000,
        .rootfs_ofs    = 0x100000,
    }, {
        /* terminating entry */
    }
};

static struct board_info boards[] = {
    {
        .id        = "TL-MR3020v1",
        .hw_id        = HWID_TL_MR3020_V1,
        .hw_rev        = 1,
        .layout_id    = "4Mlzma",
    }, {
        .id        = "TL-MR3220v1",
        .hw_id        = HWID_TL_MR3220_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-MR3420v1",
        .hw_id        = HWID_TL_MR3420_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WA701Nv1",
        .hw_id        = HWID_TL_WA701N_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WA7510N",
        .hw_id        = HWID_TL_WA7510N_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WA901NDv1",
        .hw_id        = HWID_TL_WA901ND_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id             = "TL-WA901NDv2",
        .hw_id          = HWID_TL_WA901ND_V2,
        .hw_rev         = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR741NDv1",
        .hw_id        = HWID_TL_WR741ND_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR741NDv4",
        .hw_id        = HWID_TL_WR741ND_V4,
        .hw_rev        = 1,
        .layout_id    = "4Mlzma",
    }, {
        .id        = "TL-WR740Nv1",
        .hw_id        = HWID_TL_WR740N_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR740Nv3",
        .hw_id        = HWID_TL_WR740N_V3,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR743NDv1",
        .hw_id        = HWID_TL_WR743ND_V1,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR841Nv1.5",
        .hw_id        = HWID_TL_WR841N_V1_5,
        .hw_rev        = 2,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR841NDv3",
        .hw_id        = HWID_TL_WR841ND_V3,
        .hw_rev        = 3,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR841NDv5",
        .hw_id        = HWID_TL_WR841ND_V5,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR841NDv7",
        .hw_id        = HWID_TL_WR841ND_V7,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR941NDv2",
        .hw_id        = HWID_TL_WR941ND_V2,
        .hw_rev        = 2,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR941NDv4",
        .hw_id        = HWID_TL_WR941ND_V4,
        .hw_rev        = 1,
        .layout_id    = "4M",
    }, {
        .id        = "TL-WR1041Nv2",
        .hw_id        = HWID_TL_WR1041N_V2,
        .hw_rev        = 1,
        .layout_id    = "4Mlzma",
    }, {
        .id        = "TL-WR1043NDv1",
        .hw_id        = HWID_TL_WR1043ND_V1,
        .hw_rev        = 1,
        .layout_id    = "8M",
    }, {
        .id        = "TL-WR2543Nv1",
        .hw_id        = HWID_TL_WR2543N_V1,
        .hw_rev        = 1,
        .layout_id    = "8Mlzma",
    }, {
        .id        = "TL-WR703Nv1",
        .hw_id        = HWID_TL_WR703N_V1,
        .hw_rev        = 1,
        .layout_id    = "4Mlzma",
    }, {
        /* 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"
"  -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"
"  -N <vendor>     set image vendor to <vendor>\n"
"  -V <version>    set image version to <version>\n"
"  -v <version>    set firmware 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;
    }

    return 0;
}

static void fill_header(char *buf, int len)
{
    struct fw_header *hdr = (struct fw_header *)buf;

    memset(hdr, 0, sizeof(struct fw_header));

    hdr->version = htonl(HEADER_VERSION_V1);
    strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
    strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
    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));
    else
        memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));

    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->ver_hi = htons(fw_ver_hi);
    hdr->ver_mid = htons(fw_ver_mid);
    hdr->ver_lo = htons(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_V1) {
        ERR("file does not seem to have V1 header!\n");
        goto out_free_buf;
    }

    inspect_fw_phexdec("Version 1 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) != 0)
        inspect_fw_phexdec("Unknown value 3", hdr->unk3);

    printf("\n");

    inspect_fw_pstr("Vendor name", hdr->vendor_name);
    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("\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:");
        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 '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;
}