src/consul_actor.rs

@@ -8,11 +8,12 @@ use serde::{Serialize, Deserialize};
 use serde_lexpr::{from_str,error};
 use crate::messages;
 use crate::consul;
+use std::collections::HashSet;
 
 #[derive(Serialize, Deserialize, Debug)]
 pub enum DiplonatParameter {
-  tcp_port(Vec<u16>),
-  udp_port(Vec<u16>)
+  tcp_port(HashSet<u16>),
+  udp_port(HashSet<u16>)
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -53,8 +54,8 @@ fn to_parameters(catalog: &consul::CatalogNode) -> Vec<DiplonatConsul> {
 
 fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
   let mut op = messages::PublicExposedPorts { 
-    tcp_ports: Vec::new(),
-    udp_ports: Vec::new()
+    tcp_ports: HashSet::new(),
+    udp_ports: HashSet::new()
   };
 
   for conf in params {
@@ -73,8 +74,8 @@ fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
 impl ConsulActor {
   pub fn new(url: &str, node: &str) -> Self {
     let (tx, rx) = watch::channel(messages::PublicExposedPorts{
-      tcp_ports: Vec::new(),
-      udp_ports: Vec::new()
+      tcp_ports: HashSet::new(),
+      udp_ports: HashSet::new()
     });
 
     return Self {

src/diplonat.rs

@@ -4,10 +4,12 @@ use tokio::try_join;
 use crate::consul_actor::ConsulActor;
 use crate::igd_actor::IgdActor;
 use crate::environment::Environment;
+use crate::fw_actor::FirewallActor;
 
 pub struct Diplonat {
   consul: ConsulActor,
-  igd: IgdActor
+  igd: IgdActor,
+  firewall: FirewallActor
 }
 
 impl Diplonat {
@@ -21,9 +23,15 @@ impl Diplonat {
       &ca.rx_open_ports
     ).await?;
 
+    let fw = FirewallActor::new(
+        env.refresh_time,
+        &ca.rx_open_ports
+    ).await?;
+
     let ctx = Self {
       consul: ca,
-      igd: ia
+      igd: ia,
+      firewall: fw
     };
 
     return Ok(ctx);
@@ -32,7 +40,8 @@ impl Diplonat {
   pub async fn listen(&mut self) -> Result<()> {
     try_join!(
       self.consul.listen(),
-      self.igd.listen()
+      self.igd.listen(),
+      self.firewall.listen()
     )?;
 
     return Ok(());

src/fw.rs

@@ -2,13 +2,7 @@ use iptables;
 use regex::Regex;
 use std::collections::HashSet;
 use std::io;
-
-
-#[derive(PartialEq,Eq,Debug,Hash)]
-pub struct Port {
-    proto: String,
-    number: u16,
-}
+use crate::messages;
 
 #[derive(Debug)]
 pub struct FirewallError(String);
@@ -17,26 +11,34 @@ impl From<iptables::error::IPTError> for FirewallError {
     fn from(error: iptables::error::IPTError) -> Self {
         FirewallError(error.to_string())
     }
-
 }
 
 pub fn setup(ipt: &iptables::IPTables) -> Result<(), FirewallError> {
+    
     ipt.new_chain("filter", "DIPLONAT")?;
     ipt.insert("filter", "INPUT", "-j DIPLONAT", 1)?;
+
     Ok(())
 }
 
-pub fn open_ports(ipt: &iptables::IPTables, ports: Vec<Port>) -> Result<(), FirewallError> {
+pub fn open_ports(ipt: &iptables::IPTables, ports: messages::PublicExposedPorts) -> Result<(), FirewallError> {
 
-    for p in ports {
-        ipt.append("filter", "DIPLONAT", &format!("-p {} --dport {} -j ACCEPT", p.proto, p.number))?;
+    for p in ports.tcp_ports {
+        ipt.append("filter", "DIPLONAT", &format!("-p tcp --dport {} -j ACCEPT", p))?;
+    }
+
+    for p in ports.udp_ports {
+        ipt.append("filter", "DIPLONAT", &format!("-p udp --dport {} -j ACCEPT", p))?;
     }
 
     Ok(())
 }
 
-pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<HashSet<Port>, FirewallError> {
-    let mut opened_ports: HashSet<Port> = HashSet::new();
+pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExposedPorts, FirewallError> {
+    let mut ports = messages::PublicExposedPorts {
+        tcp_ports: HashSet::new(),
+        udp_ports: HashSet::new()
+    };
 
     let list = ipt.list("filter", "DIPLONAT")?;
     let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT").unwrap();
@@ -50,13 +52,18 @@ pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<HashSet<Port>, Firew
                 let proto = String::from(raw_proto.as_str());
                 let number = String::from(raw_port.as_str()).parse::<u16>().unwrap();
 
-                opened_ports.insert( Port { proto, number } );
+                if proto == "tcp" {
+                    ports.tcp_ports.insert(number);
+                } else {
+                    ports.udp_ports.insert(number);
+                }
+
             },
             _ => {}
         }
     }
 
-    Ok(opened_ports)
+    Ok(ports)
 }
 
 pub fn cleanup(ipt: &iptables::IPTables) -> Result<(), FirewallError> {

src/fw_actor.rs

@@ -0,0 +1,80 @@
+use igd::aio::*;
+use igd::PortMappingProtocol;
+use std::net::SocketAddrV4;
+use log::*;
+use anyhow::{Result, Context};
+use tokio::{
+  select, 
+  sync::watch, 
+  time::{
+    self, 
+    Duration
+}};
+
+use iptables;
+use crate::messages;
+use crate::fw;
+use std::collections::HashSet;
+
+pub struct FirewallActor {
+  ipt: iptables::IPTables,
+  rx_ports: watch::Receiver<messages::PublicExposedPorts>,
+  last_ports: messages::PublicExposedPorts,
+  refresh: Duration
+}
+
+impl FirewallActor {
+  pub async fn new(_refresh: Duration, rxp: &watch::Receiver<messages::PublicExposedPorts>) -> Result<Self> {
+
+    
+    let ctx = Self { 
+      ipt: iptables::new(false).unwrap(),
+      rx_ports: rxp.clone(),
+      last_ports: messages::PublicExposedPorts::new(),
+      refresh: _refresh,
+    };
+
+    fw::setup(&ctx.ipt).expect("iptables setup failed");
+    
+    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! {
+        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. Update firewall rules
+      match self.do_fw_update().await {
+        Ok(()) => debug!("Successfully updated firewall rules"),
+        Err(e) => error!("An error occured while updating firewall rules. {}", e),
+      }
+    }
+  }
+
+  pub async fn do_fw_update(&self) -> Result<()> {
+    
+    let curr_opened_ports = fw::get_opened_ports(&self.ipt).unwrap();
+
+    let diff_tcp = self.last_ports.tcp_ports.difference(&curr_opened_ports.tcp_ports).copied().collect::<HashSet<u16>>();
+    let diff_udp = self.last_ports.udp_ports.difference(&curr_opened_ports.udp_ports).copied().collect::<HashSet<u16>>();
+
+    let ports_to_open = messages::PublicExposedPorts {
+        tcp_ports: diff_tcp,
+        udp_ports: diff_udp
+    };
+
+    fw::open_ports(&self.ipt, ports_to_open).unwrap();
+
+    return Ok(());
+  }
+
+}

src/main.rs

@@ -5,6 +5,7 @@ mod consul_actor;
 mod igd_actor;
 mod diplonat;
 mod fw;
+mod fw_actor;
 
 use iptables;
 use log::*;
@@ -15,9 +16,6 @@ async fn main() {
   pretty_env_logger::init();
   info!("Starting Diplonat");
 
-  let ipt = iptables::new(false).unwrap();
-  fw::setup(&ipt).expect("iptables setup failed");
-
   let mut diplo = Diplonat::new().await.expect("Setup failed");
   diplo.listen().await.expect("A runtime error occured");
 }

src/messages.rs

@@ -1,14 +1,16 @@
-#[derive(Debug, Clone)]
+use std::collections::HashSet;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct PublicExposedPorts {
-  pub tcp_ports: Vec<u16>,
-  pub udp_ports: Vec<u16>
+  pub tcp_ports: HashSet<u16>,
+  pub udp_ports: HashSet<u16>
 }
 
 impl PublicExposedPorts {
   pub fn new() -> Self {
     return Self {
-      tcp_ports: Vec::new(),
-      udp_ports: Vec::new()
+      tcp_ports: HashSet::new(),
+      udp_ports: HashSet::new()
     }
   }
 }