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use crate::cla::ConvergenceLayerAgent;
use crate::core::{DtnPeer, PeerType};
use crate::ipnd::{beacon::Beacon, services::*};
use crate::routing::RoutingNotifcation;
use crate::DTNCORE;
use crate::{peers_add, routing_notify, CONFIG};
use anyhow::Result;
use log::{debug, error, info};
use net2::UdpBuilder;
use std::collections::HashMap;
use std::io;
use std::net::SocketAddr;
use tokio::net::UdpSocket;
use tokio::time::interval;
async fn receiver(socket: UdpSocket) -> Result<(), io::Error> {
let mut buf: Vec<u8> = vec![0; 1024 * 64];
loop {
if let Ok((size, peer)) = socket.recv_from(&mut buf).await {
debug!("received {} bytes", size);
let deserialized: Beacon = match serde_cbor::from_slice(&buf[..size]) {
Ok(pkt) => pkt,
Err(e) => {
error!("Deserialization of Beacon failed!{}", e);
continue;
}
};
let dtnpeer = DtnPeer::new(
deserialized.eid().clone(),
peer.ip(),
PeerType::Dynamic,
deserialized.beacon_period(),
deserialized.service_block().clas().clone(),
deserialized.service_block().convert_services(),
);
if peers_add(dtnpeer) {
info!(
"New peer discovered: {} @ {} (len={})",
deserialized.eid(),
peer,
size
);
debug!(":\n{}", deserialized);
} else {
debug!(
"Beacon from known peer: {} @ {} (len={})",
deserialized.eid(),
peer,
size
);
debug!(":\n{}", deserialized);
}
routing_notify(RoutingNotifcation::EncounteredPeer(deserialized.eid()))
}
}
}
async fn announcer(socket: UdpSocket, _v6: bool) {
let mut task = interval(crate::CONFIG.lock().announcement_interval);
loop {
debug!("waiting announcer");
task.tick().await;
debug!("running announcer");
let eid = (*CONFIG.lock()).host_eid.clone();
let beacon_period = if !crate::CONFIG.lock().enable_period {
None
} else {
Some(crate::CONFIG.lock().announcement_interval)
};
let mut pkt = Beacon::with_config(eid, ServiceBlock::new(), beacon_period);
(*DTNCORE.lock())
.cl_list
.iter()
.for_each(|cla| pkt.add_cla(&cla.name().to_string(), &Some(cla.port())));
(*DTNCORE.lock())
.service_list
.iter()
.for_each(|(tag, payload)| pkt.add_custom_service(*tag, payload.clone()));
let mut destinations: HashMap<SocketAddr, u32> = HashMap::new();
(*CONFIG.lock())
.discovery_destinations
.iter()
.for_each(|(key, value)| {
destinations.insert(key.clone().parse().unwrap(), *value);
});
for (destination, bsn) in destinations {
(*CONFIG.lock()).update_beacon_sequence_number(&destination.to_string());
pkt.set_beacon_sequence_number(bsn);
if destination.ip().is_multicast() {
debug!(
"Sending beacon\n{}\nto multicast address {}",
pkt, destination
);
} else {
debug!(
"Sending beacon\n{}\nto unicast address {}",
pkt, destination
);
}
match socket
.send_to(&serde_cbor::to_vec(&pkt).unwrap(), destination)
.await
{
Ok(amt) => {
debug!("sent announcement (len={})", amt)
}
Err(err) => error!("Sending announcement failed: {}", err),
}
}
}
}
pub async fn spawn_neighbour_discovery() -> Result<()> {
let v4 = (*CONFIG.lock()).v4;
let v6 = (*CONFIG.lock()).v6;
let port = 3003;
if v4 {
let addr: std::net::SocketAddr = format!("0.0.0.0:{}", port).parse()?;
let socket = UdpBuilder::new_v4()?;
socket.reuse_address(true)?;
let socket = socket.bind(addr)?;
socket
.set_multicast_loop_v4(false)
.expect("error activating multicast loop v4");
for address in (*CONFIG.lock()).discovery_destinations.keys() {
let addr: SocketAddr = address.parse().expect("Error parsing discovery address");
if addr.is_ipv4() && addr.ip().is_multicast() {
socket
.join_multicast_v4(
&addr.ip().to_string().parse()?,
&std::net::Ipv4Addr::new(0, 0, 0, 0),
)
.expect("error joining multicast v4 group");
}
}
let socket1 = UdpSocket::from_std(socket.try_clone()?)?;
let socket2 = UdpSocket::from_std(socket.try_clone()?)?;
info!("Listening on {}", socket1.local_addr()?);
tokio::spawn(receiver(socket1));
tokio::spawn(announcer(socket2, false));
}
if v6 {
let addr: std::net::SocketAddr = format!("[::1]:{}", port).parse()?;
let socket = UdpBuilder::new_v6()?;
socket.reuse_address(true)?;
socket.only_v6(true)?;
let socket = socket.bind(addr)?;
socket
.set_multicast_loop_v6(false)
.expect("error activating multicast loop v6");
for address in (*CONFIG.lock()).discovery_destinations.keys() {
let addr: SocketAddr = address.parse().expect("Error while parsing IPv6 address");
if addr.is_ipv6() && addr.ip().is_multicast() {
socket
.join_multicast_v6(&addr.ip().to_string().parse()?, 0)
.expect("Error joining multicast v6 group");
}
}
let socket1 = UdpSocket::from_std(socket.try_clone()?)?;
let socket2 = UdpSocket::from_std(socket.try_clone()?)?;
info!("Listening on {}", socket1.local_addr()?);
tokio::spawn(receiver(socket1));
tokio::spawn(announcer(socket2, true));
}
Ok(())
}