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October 4, 2023 06:09
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SImple tool for unpacking and repacking firmware files with automatic squashfs decompression allowing for quick and easy embedded filesystem modifications
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#!/usr/bin/env python3 | |
import sys | |
import os | |
def usage(): | |
print("Usage: firmware-tool <(u)npack/(p)ack> <binary file/unpacked directory> [output filename]") | |
exit(0) | |
if len(sys.argv) < 3: | |
usage | |
if sys.argv[1] not in ["u", "p"]: | |
usage | |
if len(sys.argv) < 4: | |
outputFirmware = "packed_firmware.bin" | |
else: | |
outputFirmware = sys.argv[3] | |
os.system(f"cp {sys.argv[2]} {outputFirmware}") | |
sqfsPath = "unpacked/squashfs" | |
class FirmwarePart: | |
def __init__(self, name, offset, size, forceOffset = False, forceSize = False): | |
self.name = name | |
self.offset = offset | |
self.size = size | |
self.forceOffset = forceOffset | |
self.forceSize = forceSize | |
""" | |
SPECIFY YOUR FIRMWARE PARTS HERE | |
using the output of `binwalk firmware.bin`, | |
with the format FirmwarePart("part name", offset in bytes, size in bytes, whether to force the part offset, whether to force the part size), | |
currently set for the firmware of 3G-6408n_v1.19.bin | |
""" | |
firmware_parts = [ | |
FirmwarePart("misc-header-data", 0, 11288), | |
FirmwarePart("lzma-misc-data", 11288, (1114112 - 11288)), | |
FirmwarePart("squashfs", 1114112, 4353626), | |
FirmwarePart("misc-footer-data", 5467738, (5468162 - 5467738)) | |
] | |
if sys.argv[1] == "u": | |
firmwareFile = open(sys.argv[2], "rb") | |
os.system("mkdir -v unpacked") | |
for part in firmware_parts: | |
outfile = open("unpacked/" + part.name + ".bin", "wb") | |
firmwareFile.seek(part.offset, 0) | |
data = firmwareFile.read(part.size) | |
outfile.write(data) | |
outfile.close() | |
print(f"Wrote {part.size} bytes to unpacked/{part.name}.bin") | |
if part.name == "squashfs": | |
if os.system(f"unsquashfs -d {sqfsPath} {sqfsPath}.bin"): | |
print(f"Extracted {sqfsPath}.bin into {sqfsPath}/") | |
os.remove(f"{sqfsPath}.bin") | |
if sys.argv[1] == "p": | |
firmwareFile = open(outputFirmware, "wb") | |
for part in firmware_parts: | |
if part.name == "squashfs": | |
if os.path.exists(f"{sqfsPath}.bin"): | |
print(f"File {sqfsPath}.bin already exists, removing in order to avoid problems") | |
os.remove(f"{sqfsPath}.bin") | |
os.system(f"mksquashfs {sqfsPath}/* {sqfsPath}.bin -comp lzma -no-xattrs -no-sparse -no-progress -quiet") | |
print(f"Repacking {part.name} from {sys.argv[2]}/", end="") | |
if part.forceOffset: | |
firmwareFile.seek(part.offset, 0) | |
print(f", with forced offset set to {part.offset}", end="") | |
unpackedPart = open(sys.argv[2] + "/" + part.name + ".bin", "rb") | |
if part.forceSize: | |
firmwareFile.write(unpackedPart.read(part.size)) | |
print(f", with forced size set to {part.size}", end="") | |
else: | |
firmwareFile.write(unpackedPart.read()) | |
print() | |
unpackedPart.close() |
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shit, binwalk gives wrong size data, gotta fix that