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|
use std::net::{Ipv4Addr, SocketAddrV4};
use anyhow::{Context, Result};
use igd::{aio::*, PortMappingProtocol};
use log::*;
use tokio::{
select,
sync::watch,
time::{self, Duration},
};
use crate::messages;
pub struct IgdActor {
last_ports: messages::PublicExposedPorts,
rx_ports: watch::Receiver<messages::PublicExposedPorts>,
gateway: Gateway,
refresh: Duration,
expire: Duration,
private_ip: Ipv4Addr,
}
impl IgdActor {
pub async fn new(
priv_ip: Option<Ipv4Addr>,
refresh: Duration,
expire: Duration,
rxp: &watch::Receiver<messages::PublicExposedPorts>,
) -> Result<Self> {
let gw = search_gateway(Default::default())
.await
.context("Failed to find IGD gateway")?;
info!("IGD gateway: {}", gw);
let private_ip = if let Some(ip) = priv_ip {
info!("Using private IP from config: {}", ip);
ip
} else {
info!("Trying to automatically detect private IP");
let gwa = gw.addr.ip().octets();
let cmplen = match gwa {
[192, 168, _, _] => 3,
[10, _, _, _] => 2,
_ => panic!(
"Gateway IP does not appear to be in a local network ({})",
gw.addr.ip()
),
};
#[allow(unused_parens)]
let private_ip = get_if_addrs::get_if_addrs()?
.into_iter()
.map(|i| i.addr.ip())
.filter_map(|a| match a {
std::net::IpAddr::V4(a4) if a4.octets()[..cmplen] == gwa[..cmplen] => Some(a4),
_ => None,
})
.next()
.expect("No interface has an IP on same subnet as gateway");
info!("Autodetected private IP: {}", private_ip);
private_ip
};
let ctx = Self {
gateway: gw,
rx_ports: rxp.clone(),
private_ip,
refresh: refresh,
expire: expire,
last_ports: messages::PublicExposedPorts::new(),
};
return Ok(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! {
_ = self.rx_ports.changed() => Some(self.rx_ports.borrow().clone()),
_ = 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 = SocketAddrV4::new(self.private_ip, *port);
self.gateway
.add_port(
*proto,
*port,
service,
self.expire.as_secs() as u32,
"diplonat",
)
.await?;
debug!("IGD request successful for {:#?} {}", proto, service);
}
}
return Ok(());
}
}
|
