# naxalnet

**naxalnet** is an experiment to create a wireless mesh network for
communicating with each other during an internet shutdown, using
existing software and tech as much as possible. Currently
you can only communicate with other peers running naxalnet or
using the same network as naxalnet. It uses
[B.A.T.M.A.N. Advanced][batman-adv],
an implementation of the B.A.T.M.A.N. routing protocol to
communicate with peers.

The name naxal comes from Naxalbari, a village in Darjeeling,
West Bengal.

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**Disclaimer**:
In case you are either 1) a complete idiot; or 2) a member of the saffron
brigade; or 3) both, please be aware that this project is not affiliated
with any groups designated as "terrorist" groups in India.

Using the name Naxal does not imply any form of connection
with anyone the government of India collectively calles Urban
Naxals (human rights activists, lawyers, poets, writers, journalists
or anyone else advocating for their rights).

-->

## Requirements

- systemd{,-networkd} v248 or more (for [batman support][batman-systemd])
- Linux kernel with batman-adv module (if `modinfo batman-adv` shows
  no error then you already have it)
- iwd (for starting ad-hoc network)
- python3
- [python-dasbus][]
- wifi adapter with ad-hoc support
- two or more computers with wifi adapter, called nodes
- systemd-resolved (optional, for DNS)
- batctl (optional, for debugging)

## Installing

### Arch Linux

Install [naxalnet-git][] from the AUR with your favourite helper:

```sh
yay -S naxalnet-git
```

Optionally, [setup systemd-resolved][arch-resolved] for DNS if any
of the nodes have internet access.

### Manually

Clone the repo and cd into it.

Run `sudo make install` to install naxalnet. This will install naxalnet in
`/usr/bin/naxalnet`.

After installing, reload systemd so that you can enable `naxalnet.service`
without rebooting:

```sh
sudo systemctl daemon-reload
```

## How to use

You need more than one computer running for the connection to work.

### Communicate between peers

Connect a wifi adapter to all the computers you intend to run
naxalnet.
Start the naxalnet service on all of them:

```sh
sudo systemctl start naxalnet.service
```

To test if it works, run `ip addr` to find out your address.
Note the `inet` or `inet6` address of `bridge0`. Ping the address
from another computer (example: `ping 169.254.62.90`) to find out
if it is online. Press Ctrl-C to stop.

### Getting internet access

Connect an ethernet to any of the peers and start naxalnet.
Now all the peers should be able to connect after renewing
their DHCP connection (`sudo networkctl renew bridge0`).

### Tethering via WiFi AP

Connect two wifi adapters on a device and start naxalnet.
Now an ap will be created on one of the devices with
SSID `NaxalNet` and password `naxalnet256`.
If you had set up internet access on one of the peers, internet
can be accessed from the AP.

### Running at boot

Starting the service will stop `NetworkManager.service` and
`wpa_supplicant.service` if it is running. If you start either of these
services after naxalnet is started, systemd will stop naxalnet.

To run naxalnet at boot, enable the service:

```sh
sudo systemctl enable naxalnet.service
```

Now naxalnet will configure a batman interface on every boot.
Disable the service to stop running at boot:

```sh
sudo systemctl disable naxalnet.service
```

## How it works

The program naxalnet copies predefined systemd-networkd configuration
into networkd's runtime configuration directory. It uses iwd to start
an ad-hoc network named "HelloWorld". See the
[systemd-networkd](systemd-networkd) directory
to see how systemd-networkd configures the network. You can now use
services like [IPFS][], [Jami][], [Secure Scuttlebutt][ssb]
and others which can work without internet access.

## Uninstalling

Currently there is now way to uninstall naxalnet than manually removing
the files:

```sh
sudo rm -rf /usr/{bin,share}/naxalnet \
/usr/lib/systemd/system/naxalnet.service
```

## Similar projects

- [LibreMesh][libremesh]: framework for OpenWrt-based
  firmwares
- [disaster.radio][]: solar-powered communications network

## License

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

See [LICENSE](LICENSE) for the complete version of the
license.

This project is in alpha stage. Documentation is incomplete.

[batman-adv]: https://www.open-mesh.org/projects/batman-adv/wiki
[ipfs]: https://ipfs.io
[jami]: https://jami.net
[ssb]: https://scuttlebutt.nz
[python-dasbus]: https://github.com/rhinstaller/dasbus
[naxalnet-git]: https://aur.archlinux.org/packages/naxalnet-git
[arch-resolved]: https://wiki.archlinux.org/title/Systemd-resolved#DNS
[batman-systemd]: https://www.open-mesh.org/news/101
[libremesh]: https://libremesh.org
[disaster.radio]: https://disaster.radio/