pybatmesh/README.md

# naxalnet

**naxalnet** is a program to create a wireless mesh network for
communicating with each other. It can be useful during an
[internet shutdown](#internet-shutdown), or to join
[online classes](#online-class-in-remote-areas) with a group
of laptops.
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.

WARNING:
This program uses an **unencrypted** network. This means
you do not get any more privacy or security than with an open WiFi
network.

<!-- NOTE TO ACTIVISTS

Running this program in the world's largest partly-free democracy
may result in you getting arrested under the UAPA, and not
getting bail because of false evidence planted in your phone by
Pegasus, or by a forensic lab in Gujarat.

The author, much like the Government of India, does not wish
to take responsibility in your well-being if you get arrested under
a draconian national security law.

-->
<!-- UNCOMMENT WHEN NECESSARY

**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 currently at risk of death in overcrowded prisons.

-->

## Requirements

- [systemd v248 or more][batman-systemd]
- Linux kernel with batman-adv module
- [iwd][]
- python
- python-setuptools (for building and installing)
- [dasbus][]
- WiFi adapter with ad-hoc support
- two or more computers, or laptops with WiFi adapter, called nodes
- batctl (optional, for debugging)
- python pip (optional, for uninstalling)

## Installing

This program is available in the AUR for Arch users. Building
manually for other distributions may not always work.

### Arch Linux

Install [naxalnet][aur] (or [naxalnet-git][aur-devel] for the
development version) from the AUR with your favourite helper:

```sh
yay -S naxalnet
```

Optionally, [setup systemd-resolved][arch-resolved] for DNS if any
of the nodes have internet access. [Start naxalnet][startnx] when
you need it.

### Ubuntu

naxalnet is not packaged for Ubuntu, so you will have to build
and install it manually.
Currently, only the [unreleased 21.10][ubuntu-systemd] comes with the
required version of systemd. Therefore, naxalnet won't work on Ubuntu
21.04 or older.

<!-- TODO: remove this message when systemd 248 arrives in 21.04 -->

Install the requirements from the Ubuntu repositories:

```sh
# batctl is optional
sudo apt install systemd python3-pip iwd batctl build-essential
# Now, install dasbus with pip
sudo pip3 install dasbus
```

Now follow the instructions in the
[manual installation section][install-manual]

### Fedora

naxalnet is not packaged for Fedora, so it should be installed
manually. naxalnet requires atleast systemd v248 which is only
available on Fedora 34 and above. Install the dependencies:

```sh
# systemd-resolved may be required for rawhide
sudo dnf install systemd-networkd iwd python3-dasbus python3-setuptools
```

Now head over to the [next section][install-manual] to install naxalnet.

### Manually

Install the [requirements][requirements].

Clone the naxalnet repo and cd into it.

```sh
git clone https://git.disroot.org/pranav/naxalnet.git
cd naxalnet
```

Or, if you have an [IPFS client][ipfs] running, try this instead:

```sh
git clone http://k51qzi5uqu5dlye74be0n9iihwk6sm54vexo7bf7pdr4w811y6mmrcp25djozv.ipns.localhost:8080/naxalnet.git
```

Now, install naxalnet:

```sh
sudo make install
```

After installing, reload systemd so that it detects the new
service files:

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

## How to use

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

### Start naxalnet

Though naxalnet can run from the commandline, it was designed to be
run as a systemd service.
To start naxalnet, do the command on all the nodes:

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

This will start a mesh network and connect to all nodes.
To test if it works, run `sudo batctl n -w` and check for
nodes. If there are any nodes, your network is up.

### Getting internet access

Connect an ethernet cable from a router to any of the peers and
[start naxalnet][startnx]. If it was already started, you should
renew the DHCP connection of all peers. To do this, type
`sudo networkctl renew bridge0` on all peers.

### Tethering via WiFi AP

If there are two adapters in a peer, naxalnet will start a
WiFi ap (also called WiFi hotspot) on one of them.

Connect two WiFi adapters on a device and [start naxalnet][startnx].
Now an ap will be started on one of the adapters.
Type `naxalnet --print-WiFi` to get the WiFi SSID and password.

If you had set up internet access on one of the peers, internet
can be accessed from the AP.

### Running at boot

To run naxalnet at boot, enable the service on all the nodes:

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

Now naxalnet will start a mesh on every boot.
Disable the service to stop running at boot:

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

### Stopping the service

```sh
sudo systemctl stop naxalnet iwd systemd-networkd systemd-resolved
```

If your distribution uses NetworkManager, starting `naxalnet.service`
will have stopped it. Start NetworkManager again:

```sh
sudo systemctl start NetworkManager.service
```

### Configuration

naxalnet comes with a sample configuration file
`/etc/naxalnet/naxalnet.conf.example`. To change how the program
behaves, copy it to /etc/naxalnet/naxalnet.conf and edit it:

```sh
sudo cp /etc/naxalnet/naxalnet.conf{.example,}
# Now edit the file with your favourite editor as root
gedit admin:/etc/naxalnet/naxalnet.conf
```

Also, you can change its behaviour every time you run it using
arguments:

```sh
naxalnet --help
```

## How it works

There are three modes commonly supported by WiFi adapters -
`ap` (WiFi hotspot), `station` (for joining WiFi networks) and `ad-hoc`
(for decentralised networks). There are some other modes too,
like `p2p` (WiFi direct), but we won't go into the details.

naxalnet uses two modes - `ad-hoc` and `ap`, for connecting to the
mesh. naxalnet uses iwd to start an `ad-hoc` network and configures
systemd-networkd to setup a BATMAN Advanced network.
If there are two WiFi adapters connected to the machine,
naxalnet starts an ad-hoc on one of them and an ap on the other.
You can use the ap for connecting mobile phones and other devices
to the mesh network.

Read the code to learn the details.
See [systemd-networkd](systemd-networkd) to see how
systemd-networkd configures the network.

## Use cases

### Online class in remote areas

naxalnet can be used to share connections in remote areas.
You need at least one device with internet access.

### Internet shutdown

You can communicate with neighbouring devices running naxalnet,
using services like [IPFS][], [Jami][], [Secure Scuttlebutt][ssb]
and others which can work on an intranet.
They should be installed on your machine _before_ your friendly
democratic government announces an [internet shutdown][], since you
cannot download and install them during a shutdown.
When a shutdown occurs, [enable naxalnet][enablenx]

## Uninstalling

If you installed naxalnet manually, use make uninstall to remove
naxalnet and its data files. This requires python pip to be installed.

```sh
# Uninstall the program, keeping the config files
sudo make uninstall
# Or, to uninstall and remove config files
sudo make purge
```

## Contributing or reporting bugs

See [HACKING.md](HACKING.md)

## Similar projects

The following projects are similar to naxalnet, but are not designed
to be used in a machine with WiFi adapter. If you live in
an area where the materials required for any of them are easily
available, consider using them instead of naxalnet.

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

## License

naxalnet is [free/libre/swatantra][free-sw] and open source 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,
eitherversion 3 of the License, or (at your option) any later version.

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

[batman-adv]: https://www.open-mesh.org/projects/batman-adv/wiki
[internet shutdown]: https://internetshutdowns.in
[ipfs]: https://ipfs.io "InterPlanetary File System"
[jami]: https://jami.net "Peer to peer video calls"
[ssb]: https://scuttlebutt.nz "Secure Scuttlebutt"
[dasbus]: https://github.com/rhinstaller/dasbus "A python D-Bus library"
[aur]: https://aur.archlinux.org/packages/naxalnet
[aur-devel]: https://aur.archlinux.org/packages/naxalnet-git
[arch-resolved]: https://wiki.archlinux.org/title/Systemd-resolved#DNS "systemd-resolved on ArchWiki"
[batman-systemd]: https://www.open-mesh.org/news/101 "systemd v248 brings support for batman advanced"
[libremesh]: https://libremesh.org
[disaster.radio]: https://disaster.radio
[startnx]: #start-naxalnet
[iwd]: https://iwd.wiki.kernel.org "WiFi daemon"
[free-sw]: https://gnu.org/philosophy/free-sw.html "What is free software?"
[enablenx]: #running-at-boot
[ubuntu-systemd]: https://packages.ubuntu.com/impish/systemd
[requirements]: #requirements
[install-manual]: #manually