127 lines
3.2 KiB
Rust
127 lines
3.2 KiB
Rust
use std::net::SocketAddrV4;
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use anyhow::{Context, Result};
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use igd::{aio::*, PortMappingProtocol};
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use log::*;
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use tokio::{
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select,
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sync::watch,
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time::{self, Duration},
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};
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use crate::messages;
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pub struct IgdActor {
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last_ports: messages::PublicExposedPorts,
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rx_ports: watch::Receiver<messages::PublicExposedPorts>,
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gateway: Gateway,
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refresh: Duration,
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expire: Duration,
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private_ip: String,
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}
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impl IgdActor {
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pub async fn new(
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priv_ip: Option<&str>,
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refresh: Duration,
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expire: Duration,
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rxp: &watch::Receiver<messages::PublicExposedPorts>,
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) -> Result<Self> {
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let gw = search_gateway(Default::default())
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.await
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.context("Failed to find IGD gateway")?;
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info!("IGD gateway: {}", gw);
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let private_ip = if let Some(ip) = priv_ip {
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info!("Using private IP from config: {}", ip);
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ip.to_string()
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} else {
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info!("Trying to automatically detect private IP");
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let gwa = gw.addr.ip().octets();
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let cmplen = match gwa {
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[192, 168, _, _] => 3,
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[10, _, _, _] => 2,
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_ => panic!(
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"Gateway IP does not appear to be in a local network ({})",
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gw.addr.ip()
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),
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};
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let public_ip = get_if_addrs::get_if_addrs()?
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.into_iter()
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.map(|i| i.addr.ip())
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.filter(|a| match a {
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std::net::IpAddr::V4(a4) => (a4.octets()[..cmplen] == gwa[..cmplen]),
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_ => false,
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})
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.next()
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.expect("No interface has an IP on same subnet as gateway")
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.to_string();
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info!("Found private IP: {}", public_ip);
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public_ip
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};
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let ctx = Self {
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gateway: gw,
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rx_ports: rxp.clone(),
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private_ip,
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refresh: refresh,
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expire: expire,
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last_ports: messages::PublicExposedPorts::new(),
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};
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return Ok(ctx);
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}
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pub async fn listen(&mut self) -> Result<()> {
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let mut interval = time::interval(self.refresh);
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loop {
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// 1. Wait for an event
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let new_ports = select! {
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_ = self.rx_ports.changed() => Some(self.rx_ports.borrow().clone()),
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_ = interval.tick() => None,
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else => return Ok(()) // Sender dropped, terminate loop.
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};
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// 2. Update last ports if needed
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if let Some(p) = new_ports {
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self.last_ports = p;
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}
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// 3. Flush IGD requests
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match self.do_igd().await {
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Ok(()) => debug!("Successfully updated IGD"),
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Err(e) => error!("An error occured while updating IGD. {}", e),
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}
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}
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}
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pub async fn do_igd(&self) -> Result<()> {
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let actions = [
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(PortMappingProtocol::TCP, &self.last_ports.tcp_ports),
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(PortMappingProtocol::UDP, &self.last_ports.udp_ports),
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];
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for (proto, list) in actions.iter() {
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for port in *list {
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let service_str = format!("{}:{}", self.private_ip, port);
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let service = service_str
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.parse::<SocketAddrV4>()
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.context("Invalid socket address")?;
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self
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.gateway
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.add_port(
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*proto,
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*port,
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service,
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self.expire.as_secs() as u32,
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"diplonat",
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)
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.await?;
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debug!("IGD request successful for {:#?} {}", proto, service);
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}
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}
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return Ok(());
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}
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}
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