From 941942aedae347a5aeb2a4c63c3443603dd26bbb Mon Sep 17 00:00:00 2001
From: Quentin Dufour <quentin@deuxfleurs.fr>
Date: Fri, 22 May 2020 22:01:27 +0200
Subject: [PATCH] WIP igd actor

---
 src/igd_actor.rs | 54 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 49 insertions(+), 5 deletions(-)

diff --git a/src/igd_actor.rs b/src/igd_actor.rs
index 4e2f4b6..1263902 100644
--- a/src/igd_actor.rs
+++ b/src/igd_actor.rs
@@ -1,16 +1,28 @@
 use igd::aio::*;
+use igd::PortMappingProtocol;
+use std::net::SocketAddrV4;
 use log::*;
 use anyhow::{Result, Context};
-use tokio::sync::watch;
+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: String
 }
 
 impl IgdActor {
-  pub async fn new(rxp: &watch::Receiver<messages::PublicExposedPorts>) -> Result<Self> {
+  pub async fn new(priv_ip: &str, refresh: Duration, expire: Duration, rxp: &watch::Receiver<messages::PublicExposedPorts>) -> Result<Self> {
     let gw = search_gateway(Default::default())
               .await
               .context("Failed to find gateway")?;
@@ -18,16 +30,48 @@ impl IgdActor {
 
     let ctx = Self { 
       gateway: gw,
-      rx_ports: rxp.clone()
+      rx_ports: rxp.clone(),
+      private_ip: priv_ip.to_string(),
+      refresh: refresh,
+      expire: expire
     };
 
     return Ok(ctx);
   }
 
   pub async fn listen(&mut self) -> Result<()> {
-    while let Some(ports) = self.rx_ports.recv().await {
-      println!("received = {:#?}", ports);
+    let mut interval = time::interval(self.refresh);
+    loop {
+      let res = select! {
+        msg = self.rx_ports.recv() => match msg {
+          Some(ports) => { self.last_ports = ports ; return self.do_igd().await; } ,
+          None => return Ok(()) // Sender dropped, terminate loop.
+        }
+        _ = interval.tick() => self.do_igd().await
+      };
+
+      match res {
+        Ok(()) => debug!("Successfully updated IGD"),
+        Err(e) => error!("An error occured while updating IGD. {}. {:#?}", e, self.last_ports),
+      }
     }
+  }
+
+  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 {
+      for port in list {
+        let service_str = format!("{}:{}", self.private_ip, port);
+        let service: SocketAddrV4 = service_str.parse()?.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(());
   }
 }