# D4 core

D4 core are software components used in the D4 project. The software includes everything to create your own sensor network or connect
to an existing sensor network using simple clients.

## D4 core client

[D4 core client](https://github.com/D4-project/d4-core/tree/master/client) is a simple and minimal implementation of the [D4 encapsulation protocol](https://github.com/D4-project/architecture/tree/master/format). There is also a [portable D4 client](https://github.com/D4-project/d4-goclient) in Go including the support for the SSL/TLS connectivity.

### Requirements

- Unix-like operating system
- make
- a recent C compiler

### Usage

The D4 client can be used to stream any byte stream towards a D4 server.

As an example, you directly stream tcpdump output to a D4 server with the following
script:

````
tcpdump -n -s0 -w - | ./d4 -c ./conf | socat - OPENSSL-CONNECT:$D4-SERVER-IP-ADDRESS:$PORT,verify=0
````

~~~~
d4 - d4 client
Read data from the configured <source> and send it to <destination>

Usage: d4 -c  config_directory

Configuration

The configuration settings are stored in files in the configuration directory
specified with the -c command line switch.

Files in the configuration directory

key         - is the private HMAC-SHA-256-128 key.
              The HMAC is computed on the header with a HMAC value set to 0
              which is updated later.
snaplen     - the length of bytes that is read from the <source>
version     - the version of the d4 client
type        - the type of data that is send. pcap, netflow, ...
source      - the source where the data is read from
destination - the destination where the data is written to
~~~~

### Installation

~~~~
cd client
git submodule init
git submodule update
~~~~

## D4 core server

D4 core server is a complete server to handle clients (sensors) including the decapsulation of the [D4 protocol](https://github.com/D4-project/architecture/tree/master/format), control of
sensor registrations, management of decoding protocols and dispatching to adequate decoders/analysers.

### Requirements

- Python 3.6
- GNU/Linux distribution

### Installation

~~~~
cd server
./install_server.sh
./LAUNCH.sh -l
~~~~

The web interface is accessible via `http://127.0.0.1:7000/`