use socket2::{Domain, Protocol, Socket, Type};
use std::mem::MaybeUninit;
use std::net::Ipv4Addr;

fn main() -> std::io::Result<()> {
    let sock = Socket::new(Domain::IPV4, Type::RAW, Some(Protocol::from(112)))?;
    let _ = sock.join_multicast_v4(
        &Ipv4Addr::new(224, 0, 0, 18),
        &Ipv4Addr::UNSPECIFIED,
    )?;
    let mut buf = [MaybeUninit::<u8>::uninit(); 256];
    let _ = sock.recv_from(&mut buf)?;
    Ok(())
}