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n2n/packages/openwrt/README.md

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Prerequisites

This instructions explain how to build an OpenWRT .ipk package for n2n.

You will either need to build a full OpenWRT buildchain (See the github action for building openwrt.yml for some example steps) or have a working cross-compiling build environment for the OpenWRT version installed into your device.

Downloading a cross-compiling build environment

This usually comes down to the following steps:

  1. Download and extract the SDK toolchain for your device. The toolchain must match the exact OpenWRT version installed in your device. Toolchain for official OpenWRT images can be downloaded from https://downloads.openwrt.org

  2. Build the toolchain: run make menuconfig, save the configuration, then run make to build the cross compiling tools

  3. Download the feeds with ./scripts/feeds update -a

Compilation

These instructions are for building the current checked out version of the n2n source (The generally used OpenWRT alternative is to download a tar.gz file of a specific n2n version, but that is not as suitable for development or local builds)

You need both the openwrt repository and the n2n repository checked out for this. In these instructions, we assume that openwrt is the directory where your openwrt checkout is located and n2n is the directory for the n2n repository.

git clone https://github.com/ntop/n2n n2n
N2N_PKG_VERSION=$(n2n/scripts/version.sh)
export N2N_PKG_VERSION
echo $N2N_PKG_VERSION

cp -r n2n/packages/openwrt openwrt/package/n2n

cd openwrt
make oldconfig
# In the VPN section, select "m" for n2n-edge and n2n-supernode

make package/n2n/clean V=s
make package/n2n/prepare USE_SOURCE_DIR=$(realpath ../n2n) V=s
make package/n2n/compile V=s

If everything went fine, two ipk will be generated, one for the n2n-edge and the other for n2n-supernode. They can be found with find . -name "n2n*.ipk", copied to the target device, and installed with opkg install.

The github action described in .github/workflows/openwrt.yml implements an automated version of the above steps.

Configuration

The edge node can be started with /etc/init.d/edge start. Its configuration file is /etc/n2n/edge.conf.

The supernode can be started with /etc/init.d/supernode start. Its configuration file is /etc/n2n/supernode.conf.