Build luadec for TP-Link router firmware. Applies OpenWRT patches + TP-Link's custom opcode shuffling from their GPL source code.

luadec-tplink-compile.sh

#!/bin/bash
set -e  # Exit on any error

# Colors
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[0;33m'
RED='\033[0;31m'
NC='\033[0m' # No Color

echo -e "${GREEN}=================================="
echo "Building luadec with OpenWRT + TP-Link patches"
echo -e "==================================${NC}"

# Configuration
OPENWRT_BRANCH="master"
PATCH_DIR="patches.$OPENWRT_BRANCH"
# Replace with GPL Code of Target
TPLINK_GPL_URL="https://static.tp-link.com/upload/gpl-code/2025/202510/20251021/GPL_AX1800v5.tar.gz"

# Install dependencies
echo -e "${BLUE}[1/8] Installing dependencies...${NC}"
sudo apt-get update > /dev/null 2>&1
sudo apt-get install -y libncurses-dev libreadline-dev curl git build-essential wget > /dev/null 2>&1

# Clone luadec
echo -e "${BLUE}[2/8] Cloning luadec repository...${NC}"
if [ -d "luadec" ]; then
    echo -e "${YELLOW}      > Directory already exists, skipping${NC}"
    cd luadec
else
    git clone https://github.com/viruscamp/luadec > /dev/null 2>&1
    cd luadec
fi

# Initialize lua-5.1 submodule
echo -e "${BLUE}[3/8] Initializing lua-5.1 submodule...${NC}"
git submodule update --init lua-5.1 > /dev/null 2>&1

# Download OpenWRT patches
echo -e "${BLUE}[4/8] Downloading OpenWRT Lua patches...${NC}"
mkdir -p "$PATCH_DIR"
cd "$PATCH_DIR"

PATCHES=$(curl -sSL -H 'Accept: application/vnd.github.v3+json' \
    "https://api.github.com/repos/openwrt/openwrt/contents/package/utils/lua/patches?ref=$OPENWRT_BRANCH" \
    | grep -oP '"name":\s*"\K[^"]*\.patch' | sort)

if [ -z "$PATCHES" ]; then
    echo -e "${RED}ERROR: No patches found!${NC}"
    exit 1
fi

echo -e "${YELLOW}      > Found $(echo "$PATCHES" | wc -l) patches${NC}"

for patch in $PATCHES; do
    wget -q "https://raw.githubusercontent.com/openwrt/openwrt/$OPENWRT_BRANCH/package/utils/lua/patches/$patch" -O "$patch" 2>&1
done

cd ..

# Apply OpenWRT patches to lua-5.1
echo -e "${BLUE}[5/8] Applying OpenWRT patches...${NC}"
cd lua-5.1

for patch_file in ../"$PATCH_DIR"/*.patch; do
    if [ -f "$patch_file" ]; then
        patch -p1 < "$patch_file" > /dev/null 2>&1 || {
            echo -e "${YELLOW}      > WARNING: Patch $(basename "$patch_file") failed${NC}"
        }
    fi
done

# Download and extract TP-Link GPL code
echo -e "${BLUE}[6/8] Downloading TP-Link GPL code...${NC}"
cd ../..

if [ ! -f "GPL_AX1800v5.tar.gz" ]; then
    echo -e "${YELLOW}      > Downloading archive...${NC}"
    wget -q "$TPLINK_GPL_URL" 2>&1
fi

if [ ! -d "GPL_AX1800v5" ]; then
    echo -e "${YELLOW}      > Extracting archive...${NC}"
    tar -xzf GPL_AX1800v5.tar.gz 2>&1
fi

# Copy TP-Link's modified files
echo -e "${YELLOW}      > Applying TP-Link modifications...${NC}"
cd luadec/lua-5.1/src
MODIFIED_FILES=$(diff -qr ../../../GPL_AX1800v5/Iplatform/openwrt/ibase/lua/src/src/ . 2>/dev/null | grep "differ$" | wc -l)
echo -e "${YELLOW}      > Patching $MODIFIED_FILES modified files${NC}"

diff -qr ../../../GPL_AX1800v5/Iplatform/openwrt/ibase/lua/src/src/ . 2>/dev/null | grep "differ$" | awk '{print $2}' | sed 's|../../../GPL_AX1800v5/Iplatform/openwrt/ibase/lua/src/src/||' | while read file; do
    cp "../../../GPL_AX1800v5/Iplatform/openwrt/ibase/lua/src/src/$file" "$file" 2>&1
done

# Fix Makefile and compile
echo -e "${BLUE}[7/8] Compiling lua-5.1...${NC}"
MAKEFILE="Makefile"
cp "$MAKEFILE" "$MAKEFILE.bak"

sed -i '/# USE_READLINE=1/a PKG_VERSION = 5.1.5' "$MAKEFILE"
sed -i 's/CFLAGS= -O2 -Wall $(MYCFLAGS)/CFLAGS= -fPIC -O2 -Wall $(MYCFLAGS)/' "$MAKEFILE"
sed -i 's/$(CC) -o $@ -L\. -llua $(MYLDFLAGS) $(LUA_O) $(LIBS)/$(CC) -o $@ $(LUA_O) $(MYLDFLAGS) -L. -llua $(LIBS)/' "$MAKEFILE"
sed -i 's/$(CC) -o $@ -L\. -llua $(MYLDFLAGS) $(LUAC_O) $(LIBS)/$(CC) -o $@ $(LUAC_O) $(MYLDFLAGS) -L. -llua $(LIBS)/' "$MAKEFILE"

make linux > /dev/null 2>&1 || {
    echo -e "${RED}      > Compilation failed! Showing output:${NC}"
    make linux 2>&1 | tail -20
    exit 1
}

# Set library path for runtime
export LD_LIBRARY_PATH=$(pwd):$LD_LIBRARY_PATH

# Compile luadec
echo -e "${BLUE}[8/8] Compiling luadec...${NC}"
cd ../../luadec
make LUAVER=5.1 > /dev/null 2>&1 || {
    echo -e "${RED}      > Compilation failed! Showing output:${NC}"
    make LUAVER=5.1 2>&1 | tail -20
    exit 1
}

echo ""
echo -e "${GREEN}=================================="
echo "Build complete!"
echo -e "==================================${NC}"
echo ""
echo -e "luadec binary: ${YELLOW}$(pwd)/luadec${NC}"
echo ""
echo "Test with:"
echo -e "  ${YELLOW}./luadec /path/to/tplink/file.lua${NC}"
echo ""