Lines
80 %
Functions
76.92 %
use nix::{ifaddrs::getifaddrs, net::if_::InterfaceFlags};
use std::{
collections::HashSet,
net::{IpAddr, SocketAddr},
sync::Arc,
};
use tokio::{
net::UdpSocket,
time::{Duration as TokioDuration, interval},
use crate::{
proto::Whod,
server::{ignore_list::IgnoreList, rwhod::rwhod_status::generate_rwhod_status_update},
/// Default port for rwhod communication.
pub const RWHOD_BROADCAST_PORT: u16 = 513;
#[derive(Debug, Clone)]
pub struct RwhodSendTarget {
/// Name of the network interface.
pub name: String,
/// Address to send rwhod packets to.
/// This is either the broadcast address (for broadcast interfaces)
/// or the point-to-point destination address (for point-to-point interfaces).
pub addr: IpAddr,
}
/// Find all networks network interfaces suitable for rwhod communication.
pub fn determine_relevant_interfaces() -> anyhow::Result<Vec<RwhodSendTarget>> {
getifaddrs().map_err(|e| e.into()).map(|ifaces| {
ifaces
// interface must be up
.filter(|iface| iface.flags.contains(InterfaceFlags::IFF_UP))
// interface must be broadcast or point-to-point
.filter(|iface| {
iface
.flags
.intersects(InterfaceFlags::IFF_BROADCAST | InterfaceFlags::IFF_POINTOPOINT)
})
.filter_map(|iface| {
let neighbor_addr = if iface.flags.contains(InterfaceFlags::IFF_BROADCAST) {
iface.broadcast
} else if iface.flags.contains(InterfaceFlags::IFF_POINTOPOINT) {
iface.destination
} else {
None
match neighbor_addr {
Some(addr) => addr
.as_sockaddr_in()
.map(|sa| IpAddr::V4(sa.ip()))
.or_else(|| addr.as_sockaddr_in6().map(|sa| IpAddr::V6(sa.ip())))
.map(|ip_addr| RwhodSendTarget {
name: iface.interface_name,
addr: ip_addr,
}),
None => None,
// keep first occurrence per interface name
.scan(HashSet::new(), |seen, n| {
if seen.insert(n.name.clone()) {
Some(n)
.collect::<Vec<RwhodSendTarget>>()
pub async fn send_rwhod_packet_to_interface(
socket: Arc<UdpSocket>,
interface: &RwhodSendTarget,
packet: &Whod,
) -> anyhow::Result<()> {
let serialized_packet = packet.to_bytes();
// TODO: the old rwhod daemon doesn't actually ever listen to ipv6, maybe remove it
let target_addr = match interface.addr {
IpAddr::V4(addr) => SocketAddr::new(IpAddr::V4(addr), RWHOD_BROADCAST_PORT),
IpAddr::V6(addr) => SocketAddr::new(IpAddr::V6(addr), RWHOD_BROADCAST_PORT),
tracing::debug!(
"Sending rwhod packet to interface {} at address {}",
interface.name,
target_addr
);
socket
.send_to(&serialized_packet, &target_addr)
.await
.map_err(|e| anyhow::anyhow!("Failed to send rwhod packet: {}", e))?;
Ok(())
pub async fn rwhod_packet_sender_task(
interfaces: Vec<RwhodSendTarget>,
ignore_list: Option<IgnoreList>,
let mut interval = interval(TokioDuration::from_secs(60));
loop {
interval.tick().await;
let status_update = generate_rwhod_status_update(ignore_list.as_ref())?;
tracing::debug!("Generated rwhod packet: {:?}", status_update);
let packet = status_update
.try_into()
.map_err(|e| anyhow::anyhow!("{}", e))?;
for interface in &interfaces {
if let Err(e) = send_rwhod_packet_to_interface(socket.clone(), interface, &packet).await
{
tracing::error!(
"Failed to send rwhod packet on interface {}: {}",
e
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_determine_relevant_interfaces() {
let interfaces = determine_relevant_interfaces().unwrap();
for interface in interfaces {
println!("Interface: {} Address: {}", interface.name, interface.addr);