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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)](https://en.wikipedia.org/wiki/Internet_Group_Management_Protocol)
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.
* [pierf packet generator and analyzer](https://pierf.sourceforge.net/): A
  packet injection tool.
* [Send IGMP](https://sendigmp.com/#examples): A simple command-line tool to
  send IGMP packets
* [Ostatino](https://github.com/pstavirs/ostinato): Traffic generator for
  network engineers.
* [individuwill/mcast](https://github.com/individuwill/mcast)
* [troglobit/mcjoin](https://github.com/troglobit/mcjoin)
* [troglobit/mrdisc](https://github.com/troglobit/mrdisc)
* [troglobit/mrouted](https://github.com/troglobit/mrouted)
* [scapy](https://scapy.net/)
  * <https://itecnote.com/tecnote/python-send-igmp-packets-with-scapy/>
  * <https://gist.github.com/sdir/6e44c14f6fd29149689b2f9fe37ba6b9>

* <https://github.com/Abaco-Systems/WinPcap-igmp-join>

## References

* https://www.ietf.org/proceedings/50/I-D/idmr-snoop-00.txt
* https://www.rfc-editor.org/rfc/rfc4541
* [Wikipedia: IGMP Snooping](https://en.wikipedia.org/wiki/IGMP_snooping)
* [Wikipedia: Multicast Listener Discovery](https://en.wikipedia.org/wiki/Multicast_Listener_Discovery)