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use std::net::SocketAddrV4;
use anyhow::{Context, Result};
use igd::aio::*;
use igd::PortMappingProtocol;
use log::*;
use tokio::{
select,
sync::watch,
time::{self, Duration},
};
use crate::config::RuntimeConfigIgd;
use crate::messages;
pub struct IgdActor {
expire: Duration,
gateway: Gateway,
last_ports: messages::PublicExposedPorts,
private_ip: String,
refresh: Duration,
rx_ports: watch::Receiver<messages::PublicExposedPorts>,
}
impl IgdActor {
pub async fn new(
config: Option<RuntimeConfigIgd>,
rxp: &watch::Receiver<messages::PublicExposedPorts>,
) -> Result<Option<Self>> {
if config.is_none() {
return Ok(None);
}
let config = config.unwrap();
let gw = search_gateway(Default::default())
.await
.context("Failed to find IGD gateway")?;
info!("IGD gateway: {}", gw);
let ctx = Self {
expire: config.expiration_time,
gateway: gw,
last_ports: messages::PublicExposedPorts::new(),
private_ip: config.private_ip,
refresh: config.refresh_time,
rx_ports: rxp.clone(),
};
return Ok(Some(ctx));
}
pub async fn listen(&mut self) -> Result<()> {
let mut interval = time::interval(self.refresh);
loop {
// 1. Wait for an event
let new_ports = select! {
Some(ports) = self.rx_ports.recv() => Some(ports),
_ = interval.tick() => None,
else => return Ok(()) // Sender dropped, terminate loop.
};
// 2. Update last ports if needed
if let Some(p) = new_ports {
self.last_ports = p;
}
// 3. Flush IGD requests
match self.do_igd().await {
Ok(()) => debug!("Successfully updated IGD"),
Err(e) => error!("An error occured while updating IGD. {}", e),
}
}
}
pub async fn do_igd(&self) -> Result<()> {
let actions = [
(PortMappingProtocol::TCP, &self.last_ports.tcp_ports),
(PortMappingProtocol::UDP, &self.last_ports.udp_ports),
];
for (proto, list) in actions.iter() {
for port in *list {
let service_str = format!("{}:{}", self.private_ip, port);
let service = service_str
.parse::<SocketAddrV4>()
.context("Invalid socket address")?;
self
.gateway
.add_port(
*proto,
*port,
service,
self.expire.as_secs() as u32,
"diplonat",
)
.await?;
debug!("IGD request successful for {:#?} {}", proto, service);
}
}
return Ok(());
}
}
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