🐣 so that's how multicast groups work

main
_ 2021-11-26 21:46:27 +00:00
commit 73b93d99af
4 changed files with 78 additions and 0 deletions

1
.gitignore vendored Normal file
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/target

16
Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "anyhow"
version = "1.0.48"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "62e1f47f7dc0422027a4e370dd4548d4d66b26782e513e98dca1e689e058a80e"
[[package]]
name = "lookaround"
version = "0.1.0"
dependencies = [
"anyhow",
]

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Cargo.toml Normal file
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[package]
name = "lookaround"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0.48"

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src/main.rs Normal file
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use std::{
env,
net::{
Ipv4Addr,
UdpSocket,
},
str::FromStr,
};
use anyhow::{
self,
Result,
bail,
};
fn main () -> Result <()> {
let mut args = env::args ();
let _exe_name = args.next ();
match args.next ().as_ref ().map (|s| &s[..]) {
None => bail! ("First argument must be a subcommand"),
Some ("client") => client ()?,
Some ("server") => server ()?,
Some (x) => bail! ("Unknown subcommand {}", x),
}
Ok (())
}
fn client () -> Result <()> {
let socket = UdpSocket::bind ("0.0.0.0:9041").unwrap ();
socket.join_multicast_v4 (&(Ipv4Addr::from_str ("225.100.99.98").unwrap ()), &([0u8, 0, 0, 0].into ())).unwrap ();
socket.send_to ("hi there".as_bytes (), ("225.100.99.98", 9040)).unwrap ();
Ok (())
}
fn server () -> Result <()> {
let socket = UdpSocket::bind ("0.0.0.0:9040").unwrap ();
socket.join_multicast_v4 (&(Ipv4Addr::from_str ("225.100.99.98").unwrap ()), &([0u8, 0, 0, 0].into ())).unwrap ();
let mut buf = vec! [0u8; 4096];
let (bytes_recved, remote_addr) = socket.recv_from (&mut buf).unwrap ();
dbg! (bytes_recved, remote_addr);
Ok (())
}