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# IGMP Packet Generator

## Overview

The IGMP Packet Generator (`igmpgen`) is a specialized tool designed for
generating various types of Internet Group Management Protocol (IGMP) packets. 

This tool is particularly useful for network administrators, developers, and
researchers involved in testing and analyzing multicast network protocols.

## Features

* **Support for Multiple IGMP Versions**: Compatible with IGMPv1, IGMPv2, and
  IGMPv3.
* **Variety of IGMP Packets**: Capable of generating Query, Report, Leave, and
  other IGMP packet types.
* **Customizable Packet Parameters**: Allows setting of source/destination IPs,
  ports, and multicast groups.
* **Router Alert Option**: Implements the Router Alert IP option (IPOPT_RA).

## Requirements

* Unix-like operating system.
* `libnet` library
* CMake for building the project.

For debian/ubuntu, simply type:

```shell-session
sudo apt-get install cmake libnet1-dev gcc rpm
```

## Install

### Clone the Repository (if applicable):

```bash
git clone https://code.apps.glenux.net/glenux/igmpgen
cd igmpgen
```

### Build with CMake:

Run CMake and build the project:

```shell-session
cmake -S . -B _build
cmake --build _build
```

### Install binaries

Either with your favorite packaging system

```shell-session
cpack
```

Or directly

```shell-session
cmake --install _build
```

## Usage

After building, you can run `igmpgen` with the necessary command-line arguments:

### Command-Line Arguments

```bash
IGMP packet generator

Usage: ./igmpgen [options]

Options:
  -i <interface>   Specify the network interface (e.g., eth0)
  -t <type>        Specify the IGMP packet type and version (e.g., 1.query)
  -g <group>       Specify the IGMP group (e.g., 224.0.0.1)
  -s <source>      Specify the source IP and port (e.g., 192.168.1.1:1234)
  -d <destination> Specify the destination IP and port (e.g., 224.0.0.2:5678)
  -n <number>      Specify delay between packets in seconds (optional)

Available IGMP packet types:
 - 1.query
 - 1.report
 - 1.dvmrp
 - 2.query
 - 2.report
 - 2.leave
 - 3.report
```

### Example

Generate an IGMPv2 Membership Report for group `224.0.0.1` on `eth0`:

```bash
./igmpgen -i eth0 -g 224.0.0.1 -t 2.report
```

## Contributing

Contributions to `igmpgen` are welcome. Please feel free to report issues,
suggest features, or submit pull requests.

## License

This project is licensed under the LGPL 3.0-or-later.

## Related projects

* [IGMPproxy (Official Version)](https://github.com/pali/igmpproxy): The official version of the IGMPproxy tool.
* [IGMPproxy with IGMPv3 & FreeBSD support](https://github.com/ViToni/igmpproxy/): A version of IGMPproxy with added support for IGMPv3 and FreeBSD.