Overview
This fork-luadec is only for OpenWRT!
LuaDec is a Lua decompiler for lua 5.1 , and experimental for lua 5.2 and 5.3. It is based on Hisham Muhammad's luadec which targeted lua 5.0.x and LuaDec51 by Zsolt Sz. Sztupak. LuaDec is free software and uses the same license as the original LuaDec.
Compiling
git clone https://github.com/viruscamp/luadec
cd luadec
cd lua-openwrt
make linux
cd ../luadec
MYPATCH=openwrt LUAVER=5.1 make
If you want to build it for lua 5.2 or 5.3 , just replace 5.1 above to 5.2 or 5.3 (git submodule update --init lua-5.1).
Usage
- decompile lua binary file:
luadec abc.luac - decompile lua source file for testing and comparing:
luadec abc.lua - disassemble lua source or binary
luadec -dis abc.lua - -pn print nested functions structure, could be used by -fn
luadec -pn test.lua
0
0_0
0_0_0
0_1- -f decompile only specific nested function
luadec -f 0_1 test.lua - -ns donot process sub functions
luadec -ns -f 0_1 test.lua - -fc perform a instruction-by-instruction compare for each function
luadec -fc test.lua
outputs:
-- function check pass 0
-- function check fail 0_0 : cannot compile
-- function check fail 0_1 : different code size; sizecode org: 66, decompiled: 67, same: 47;
There are some more options, usually for debug purposes, or for cases where the built in local guesser guesses wrong. Use -h to get a complete list of usable parameters
Useful script
decompile all lua files
./decompile_all.sh
usage: ./decompile_all.sh <input_folder> <out_folder>Credits
Original by Hisham Muhammad (http://luadec.luaforge.net)
Ongoing port to Lua 5.1 by Zsolt Sz. Sztupak (https://github.com/sztupy/luadec51/)
Patch by OpenWRT (https://github.com/openwrt/openwrt) and Yansong Li (https://github.com/liyansong2018/luadec)
The internals of Lua5.1 was learned from Kein-Hong Man's A No-Frills Introduction to Lua 5.1 VM Instructions