firmware-utils: kernel image generator for TP-Link RE450
The firmware image that is used in TP-Link RE450 (and some more devices from the RE series) is tplink-safeloader. In the kernel partition, the kernel is compressed in a regular tp-link firmware that is just used for booting. Since it is only used for compressing and booting, only four fields are filled in the header: Vendor, version, kernel load address and kernel entry point. mktplinkfw-kernel is a simpler version of mktpolinkfw that generate such images. It also specifies the hardware id (as it is in the product info section), so when doing a sysupgrade - the existing code will check for hardware compatibility. Signed-off-by: Tal Keren <kooolk@gmail.com> [rd@radekdostal.com: add build target to .../image/tp-link.mk] Signed-off-by: Radek Dostál <rd@radekdostal.com>v19.07.3_mercusys_ac12_duma
Tal Keren
8 years ago
committed by
Jo-Philipp Wich
parent
87b0747263
commit
0d9d980ecd
@ -0,0 +1,352 @@
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/*
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* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2016 Tal Keren <kooolk@gmail.com>
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*
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* Stripped down version of the regular tplink firmware that is only used
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* for compressing and booting the kernel.
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*
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* This tool was based on:
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* TP-Link WR941 V2 firmware checksum fixing tool.
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* Copyright (C) 2008,2009 Wang Jian <lark@linux.net.cn>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h> /* for unlink() */
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#include <libgen.h>
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#include <getopt.h> /* for getopt() */
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#include <stdarg.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })
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#define HEADER_VERSION_V1 0x01000000
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#define MD5SUM_LEN 16
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struct file_info {
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char *file_name; /* name of the file */
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uint32_t file_size; /* length of the file */
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};
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struct fw_header {
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uint32_t version; /* header version */
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char vendor_name[24];
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char fw_version[36];
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uint32_t hw_id; /* hardware id */
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uint32_t hw_rev; /* hardware revision */
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uint32_t unk1;
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uint8_t md5sum1[MD5SUM_LEN];
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uint32_t unk2;
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uint8_t md5sum2[MD5SUM_LEN];
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uint32_t unk3;
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uint32_t kernel_la; /* kernel load address */
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uint32_t kernel_ep; /* kernel entry point */
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uint32_t fw_length; /* total length of the firmware */
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uint32_t kernel_ofs; /* kernel data offset */
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uint32_t kernel_len; /* kernel data length */
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uint32_t rootfs_ofs; /* rootfs data offset */
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uint32_t rootfs_len; /* rootfs data length */
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uint32_t boot_ofs; /* bootloader data offset */
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uint32_t boot_len; /* bootloader data length */
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uint16_t ver_hi;
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uint16_t ver_mid;
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uint16_t ver_lo;
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uint8_t pad[354];
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} __attribute__ ((packed));
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/*
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* Globals
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*/
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static char *ofname;
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static char *progname;
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static char *vendor = "TP-LINK Technologies";
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static char *version = "ver. 1.0";
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static char *fw_ver = "0.0.0";
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static uint32_t hdr_ver = HEADER_VERSION_V1;
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static char *opt_hw_id;
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static uint32_t hw_id = 0;
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static struct file_info kernel_info;
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static uint32_t kernel_la = 0;
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static uint32_t kernel_ep = 0;
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static uint32_t kernel_len = 0;
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/*
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* Message macros
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*/
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#define ERR(fmt, ...) do { \
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt "\n", \
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progname, ## __VA_ARGS__ ); \
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} while (0)
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#define ERRS(fmt, ...) do { \
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int save = errno; \
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt ": %s\n", \
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progname, ## __VA_ARGS__, strerror(save)); \
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} while (0)
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#define DBG(fmt, ...) do { \
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fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
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} while (0)
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static void usage(int status)
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{
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FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
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struct board_info *board;
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fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
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fprintf(stream,
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"\n"
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"Options:\n"
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" -E <ep> kernel entry point with <ep> (hexval prefixed with 0x)\n"
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" -L <la> kernel load address with <la> (hexval prefixed with 0x)\n"
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" -H <hwid> use hardware id specified with <hwid>\n"
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" -k <file> read kernel image from the file <file>\n"
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" -o <file> write output to the file <file>\n"
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" -N <vendor> set image vendor to <vendor>\n"
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" -V <version> set image version to <version>\n"
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" -h show this screen\n"
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);
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exit(status);
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}
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static int get_file_stat(struct file_info *fdata)
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{
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struct stat st;
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int res;
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if (fdata->file_name == NULL)
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return 0;
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res = stat(fdata->file_name, &st);
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if (res){
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ERRS("stat failed on %s", fdata->file_name);
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return res;
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}
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fdata->file_size = st.st_size;
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return 0;
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}
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static int read_to_buf(struct file_info *fdata, char *buf)
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{
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FILE *f;
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int ret = EXIT_FAILURE;
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f = fopen(fdata->file_name, "r");
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if (f == NULL) {
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ERRS("could not open \"%s\" for reading", fdata->file_name);
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goto out;
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}
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errno = 0;
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fread(buf, fdata->file_size, 1, f);
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if (errno != 0) {
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ERRS("unable to read from file \"%s\"", fdata->file_name);
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goto out_close;
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}
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ret = EXIT_SUCCESS;
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out_close:
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fclose(f);
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out:
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return ret;
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}
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static int check_options(void)
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{
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int ret;
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if (opt_hw_id) {
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hw_id = strtoul(opt_hw_id, NULL, 0);
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}
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if (!kernel_la || !kernel_ep) {
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ERR("kernel loading address and entry point must be specified");
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return -1;
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}
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if (kernel_info.file_name == NULL) {
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ERR("no kernel image specified");
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return -1;
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}
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ret = get_file_stat(&kernel_info);
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if (ret)
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return ret;
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kernel_len = kernel_info.file_size;
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if (ofname == NULL) {
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ERR("no output file specified");
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return -1;
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}
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return 0;
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}
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static void fill_header(char *buf)
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{
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struct fw_header *hdr = (struct fw_header *)buf;
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memset(hdr, 0, sizeof(struct fw_header));
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hdr->version = htonl(hdr_ver);
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strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
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strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
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/**
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* This field is ignored and not specified in stock firmware
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* It is specified here to ensure sysupgrade hardware compatibility
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* The hardware id of a device is in the product-info partition
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*/
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hdr->hw_id = htonl(hw_id);
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hdr->kernel_la = htonl(kernel_la);
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hdr->kernel_ep = htonl(kernel_ep);
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hdr->kernel_ofs = htonl(sizeof(struct fw_header));
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hdr->kernel_len = htonl(kernel_len);
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}
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static int write_fw(char *data, int len)
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{
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FILE *f;
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int ret = EXIT_FAILURE;
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f = fopen(ofname, "w");
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if (f == NULL) {
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ERRS("could not open \"%s\" for writing", ofname);
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goto out;
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}
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errno = 0;
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fwrite(data, len, 1, f);
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if (errno) {
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ERRS("unable to write output file");
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goto out_flush;
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}
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DBG("firmware file \"%s\" completed", ofname);
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ret = EXIT_SUCCESS;
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out_flush:
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fflush(f);
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fclose(f);
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if (ret != EXIT_SUCCESS) {
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unlink(ofname);
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}
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out:
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return ret;
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}
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static int build_fw(void)
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{
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int buflen;
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char *buf;
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char *p;
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int ret = EXIT_FAILURE;
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buflen = sizeof(struct fw_header) + kernel_len;
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buflen = ALIGN(buflen, 0x4);
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buf = malloc(buflen);
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if (!buf) {
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ERR("no memory for buffer\n");
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goto out;
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}
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memset(buf, 0, buflen);
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p = buf + sizeof(struct fw_header);
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ret = read_to_buf(&kernel_info, p);
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if (ret)
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goto out_free_buf;
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fill_header(buf);
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ret = write_fw(buf, buflen);
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if (ret)
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goto out_free_buf;
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ret = EXIT_SUCCESS;
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out_free_buf:
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free(buf);
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out:
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return ret;
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}
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int main(int argc, char *argv[])
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{
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int ret = EXIT_FAILURE;
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int err;
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FILE *outfile;
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progname = basename(argv[0]);
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while ( 1 ) {
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int c;
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c = getopt(argc, argv, "H:E:L:V:N:k:o:h");
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if (c == -1)
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break;
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switch (c) {
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case 'H':
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opt_hw_id = optarg;
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break;
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case 'E':
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sscanf(optarg, "0x%x", &kernel_ep);
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break;
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case 'L':
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sscanf(optarg, "0x%x", &kernel_la);
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break;
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case 'V':
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version = optarg;
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break;
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case 'N':
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vendor = optarg;
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break;
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case 'k':
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kernel_info.file_name = optarg;
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break;
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case 'o':
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ofname = optarg;
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break;
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case 'h':
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usage(EXIT_SUCCESS);
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break;
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default:
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usage(EXIT_FAILURE);
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break;
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}
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}
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ret = check_options();
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if (ret)
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goto out;
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ret = build_fw();
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out:
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return ret;
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}
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