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openwrt/tools/firmware-utils/src/mktplinkfw-lib.c

266 lines
4.9 KiB
C

/*
* 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 <stdbool.h>
#include <endian.h>
#include <errno.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "mktplinkfw-lib.h"
#include "md5.h"
extern char *ofname;
extern char *progname;
extern uint32_t kernel_len;
extern struct file_info kernel_info;
extern struct file_info rootfs_info;
extern struct flash_layout *layout;
extern uint32_t rootfs_ofs;
extern uint32_t rootfs_align;
extern int combined;
extern int strip_padding;
extern int add_jffs2_eof;
static unsigned char jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
void fill_header(char *buf, int len);
struct flash_layout *find_layout(struct flash_layout *layouts, const 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;
}
void get_md5(const char *data, int size, uint8_t *md5)
{
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, data, size);
MD5_Final(md5, &ctx);
}
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;
}
int read_to_buf(const 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 pad_jffs2(char *buf, int currlen, int maxlen)
{
int len;
uint32_t pad_mask;
len = currlen;
pad_mask = (4 * 1024) | (64 * 1024); /* EOF at 4KB and at 64KB */
while ((len < maxlen) && (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;
}
int write_fw(const char *ofname, const 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;
}
/* Helper functions to inspect_fw() representing different output formats */
inline void inspect_fw_pstr(const char *label, const char *str)
{
printf("%-23s: %s\n", label, str);
}
inline void inspect_fw_phex(const char *label, uint32_t val)
{
printf("%-23s: 0x%08x\n", label, val);
}
inline void inspect_fw_phexdec(const char *label, uint32_t val)
{
printf("%-23s: 0x%08x / %8u bytes\n", label, val, val);
}
inline void inspect_fw_pmd5sum(const char *label, const uint8_t *val, const char *text)
{
int i;
printf("%-23s:", label);
for (i=0; i<MD5SUM_LEN; i++)
printf(" %02x", val[i]);
printf(" %s\n", text);
}
// header_size = sizeof(struct fw_header)
int build_fw(size_t header_size)
{
int buflen;
char *buf;
char *p;
int ret = EXIT_FAILURE;
int writelen = 0;
writelen = header_size + kernel_len;
if (combined)
buflen = writelen;
else
buflen = layout->fw_max_len;
buf = malloc(buflen);
if (!buf) {
ERR("no memory for buffer\n");
goto out;
}
memset(buf, 0xff, buflen);
p = buf + header_size;
ret = read_to_buf(&kernel_info, p);
if (ret)
goto out_free_buf;
if (!combined) {
tools/firmware-utils: mktplinkfw* fix rootfs offset With '-a' specified on the command line, the current code: - computes an aligned _kernel length_ instead of an aligned _rootfs offset_. - does not update the rootfs offset after computing the new kernel length, and instead retains the layout default. When the kernel length exceeds the available space left with this fixed offset, the resulting image header contains invalid data, with the recorded rootfs offset overlapping the kernel area. This patch ensures that rootfs offset is correctly computed and reflected in the final image. Furthermore, the build_fw() function special cases the rootfs_align option because of the above invalid logic. This is also fixed and the computed (or command-line provided, or layout-provided) rootfs_ofs value is used in all cases. There seems to be no valid reason to extend the kernel length beyond the actual length of the kernel itself (OFW images don't do it) so this part of the existing behavior is dropped. Example image before the patch: Kernel data offset : 0x00000200 / 512 bytes Kernel data length : 0x00158438 / 1410104 bytes Kernel load address : 0x00000080 Kernel entry point : 0x00000080 Rootfs data offset : 0x00140000 / 1310720 bytes Rootfs data length : 0x001e4f7e / 1986430 bytes Example image after the patch: Kernel data offset : 0x00000200 / 512 bytes Kernel data length : 0x001583fe / 1410046 bytes Kernel load address : 0x00000080 Kernel entry point : 0x00000080 Rootfs data offset : 0x00158600 / 1410560 bytes Rootfs data length : 0x001e4e22 / 1986082 bytes Tested-by: Mathias Kresin <dev@kresin.me> Tested-by: Stefan Lippers-Hollmann <s.l-h@gmx.de> Tested-by: Daniel Engberg <daniel.engberg.lists@pyret.net> Tested-by: Henryk Heisig <hyniu@o2.pl> Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
7 years ago
p = buf + rootfs_ofs;
ret = read_to_buf(&rootfs_info, p);
if (ret)
goto out_free_buf;
tools/firmware-utils: mktplinkfw* fix rootfs offset With '-a' specified on the command line, the current code: - computes an aligned _kernel length_ instead of an aligned _rootfs offset_. - does not update the rootfs offset after computing the new kernel length, and instead retains the layout default. When the kernel length exceeds the available space left with this fixed offset, the resulting image header contains invalid data, with the recorded rootfs offset overlapping the kernel area. This patch ensures that rootfs offset is correctly computed and reflected in the final image. Furthermore, the build_fw() function special cases the rootfs_align option because of the above invalid logic. This is also fixed and the computed (or command-line provided, or layout-provided) rootfs_ofs value is used in all cases. There seems to be no valid reason to extend the kernel length beyond the actual length of the kernel itself (OFW images don't do it) so this part of the existing behavior is dropped. Example image before the patch: Kernel data offset : 0x00000200 / 512 bytes Kernel data length : 0x00158438 / 1410104 bytes Kernel load address : 0x00000080 Kernel entry point : 0x00000080 Rootfs data offset : 0x00140000 / 1310720 bytes Rootfs data length : 0x001e4f7e / 1986430 bytes Example image after the patch: Kernel data offset : 0x00000200 / 512 bytes Kernel data length : 0x001583fe / 1410046 bytes Kernel load address : 0x00000080 Kernel entry point : 0x00000080 Rootfs data offset : 0x00158600 / 1410560 bytes Rootfs data length : 0x001e4e22 / 1986082 bytes Tested-by: Mathias Kresin <dev@kresin.me> Tested-by: Stefan Lippers-Hollmann <s.l-h@gmx.de> Tested-by: Daniel Engberg <daniel.engberg.lists@pyret.net> Tested-by: Henryk Heisig <hyniu@o2.pl> Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
7 years ago
writelen = rootfs_ofs + rootfs_info.file_size;
if (add_jffs2_eof)
writelen = pad_jffs2(buf, writelen, layout->fw_max_len);
}
if (!strip_padding)
writelen = buflen;
fill_header(buf, writelen);
ret = write_fw(ofname, buf, writelen);
if (ret)
goto out_free_buf;
ret = EXIT_SUCCESS;
out_free_buf:
free(buf);
out:
return ret;
}