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tplink-safeloader: add support to convert factory into sysupgrade

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Those converted factory images can be used to regain the original
tp-link firmware.
Be aware of firmware upgrade which additional require changes of
other partition than os-image (kernel) & file-system (rootfs).
OEM factory images from tplink can change nearly all partitions.
However using those images, OpenWrt's sysupgrade will only
modify the partitions os-image and file-system.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
This commit is contained in:
Alexander Couzens 2018-03-02 00:44:31 +01:00
parent 638e2193fe
commit 068ba612db
No known key found for this signature in database
GPG key ID: C29E9DA6A0DF8604
1 changed files with 103 additions and 3 deletions
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106
tools/firmware-utils/src/tplink-safeloader.c
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@ -1392,7 +1392,8 @@ static void usage(const char *argv0) {
" -S create sysupgrade instead of factory image\n"
"Extract an old image:\n"
" -x <file> extract all oem firmware partition\n"
" -d <dir> destination to extract the firmware partition\n",
" -d <dir> destination to extract the firmware partition\n"
" -z <file> convert an oem firmware into a sysupgade file. Use -o for output file\n",
argv0
);
};
@ -1632,9 +1633,100 @@ static int extract_firmware(const char *input, const char *output_directory)
return 0;
}
static struct flash_partition_entry *find_partition(
struct flash_partition_entry *entries, size_t max_entries,
const char *name, const char *error_msg)
{
for (int i=0; i<max_entries; i++, entries++) {
if (strcmp(entries->name, name) == 0)
return entries;
}
error(1, 0, "%s", error_msg);
return NULL;
}
static void write_ff(FILE *output_file, size_t size)
{
char buf[4096];
int offset;
memset(buf, 0xff, sizeof(buf));
for (offset = 0; offset + sizeof(buf) < size ; offset += sizeof(buf)) {
if (fwrite(buf, sizeof(buf), 1, output_file) < 0)
error(1, errno, "Can not write 0xff to output_file");
}
/* write last chunk smaller than buffer */
if (offset < size) {
offset = size - offset;
if (fwrite(buf, offset, 1, output_file) < 0)
error(1, errno, "Can not write partition to output_file");
}
}
static void convert_firmware(const char *input, const char *output)
{
struct flash_partition_entry fwup[MAX_PARTITIONS] = { 0 };
struct flash_partition_entry flash[MAX_PARTITIONS] = { 0 };
struct flash_partition_entry *fwup_os_image = NULL, *fwup_file_system = NULL;
struct flash_partition_entry *flash_os_image = NULL, *flash_file_system = NULL;
struct flash_partition_entry *fwup_partition_table = NULL;
size_t firmware_offset = 0x1014;
FILE *input_file, *output_file;
struct stat statbuf;
/* check input file */
if (stat(input, &statbuf)) {
error(1, errno, "Can not read input firmware %s", input);
}
input_file = fopen(input, "rb");
if (!input_file)
error(1, 0, "Can not open input firmware %s", input);
output_file = fopen(output, "wb");
if (!output_file)
error(1, 0, "Can not open output firmware %s", output);
if (read_partition_table(input_file, firmware_offset, fwup, MAX_PARTITIONS, 0) != 0) {
error(1, 0, "Error can not read the partition table (fwup-ptn)");
}
fwup_os_image = find_partition(fwup, MAX_PARTITIONS,
"os-image", "Error can not find os-image partition (fwup)");
fwup_file_system = find_partition(fwup, MAX_PARTITIONS,
"file-system", "Error can not find file-system partition (fwup)");
fwup_partition_table = find_partition(fwup, MAX_PARTITIONS,
"partition-table", "Error can not find partition-table partition");
/* the flash partition table has a 0x00000004 magic haeder */
if (read_partition_table(input_file, firmware_offset + fwup_partition_table->base + 4, flash, MAX_PARTITIONS, 1) != 0)
error(1, 0, "Error can not read the partition table (flash)");
flash_os_image = find_partition(flash, MAX_PARTITIONS,
"os-image", "Error can not find os-image partition (flash)");
flash_file_system = find_partition(flash, MAX_PARTITIONS,
"file-system", "Error can not find file-system partition (flash)");
/* write os_image to 0x0 */
write_partition(input_file, firmware_offset, fwup_os_image, output_file);
write_ff(output_file, flash_os_image->size - fwup_os_image->size);
/* write file-system behind os_image */
fseek(output_file, flash_file_system->base - flash_os_image->base, SEEK_SET);
write_partition(input_file, firmware_offset, fwup_file_system, output_file);
write_ff(output_file, flash_file_system->size - fwup_file_system->size);
fclose(output_file);
fclose(input_file);
}
int main(int argc, char *argv[]) {
const char *board = NULL, *kernel_image = NULL, *rootfs_image = NULL, *output = NULL;
const char *extract_image = NULL, *output_directory = NULL;
const char *extract_image = NULL, *output_directory = NULL, *convert_image = NULL;
bool add_jffs2_eof = false, sysupgrade = false;
unsigned rev = 0;
const struct device_info *info;
@ -1643,7 +1735,7 @@ int main(int argc, char *argv[]) {
while (true) {
int c;
c = getopt(argc, argv, "B:k:r:o:V:jSh:x:d:");
c = getopt(argc, argv, "B:k:r:o:V:jSh:x:d:z:");
if (c == -1)
break;
@ -1688,6 +1780,10 @@ int main(int argc, char *argv[]) {
extract_image = optarg;
break;
case 'z':
convert_image = optarg;
break;
default:
usage(argv[0]);
return 1;
@ -1700,6 +1796,10 @@ int main(int argc, char *argv[]) {
if (!output_directory)
error(1, 0, "Can not extract an image without output directory. Use -d <dir>");
extract_firmware(extract_image, output_directory);
} else if (convert_image) {
if (!output)
error(1, 0, "Can not convert a factory/oem image into sysupgrade image without output file. Use -o <file>");
convert_firmware(convert_image, output);
} else {
if (!board)
error(1, 0, "no board has been specified");