Allow Diplonat to automatically detect it's private IP

8 files changed, 60 insertions, 30 deletions

diff --git a/src/config/options.rs b/src/config/options.rs
index b8dccf7..f62d14c 100644
--- a/src/config/options.rs
+++ b/src/config/options.rs
@@ -62,7 +62,9 @@ impl ConfigOpts {
   // Currently only used in tests
   #[allow(dead_code)]
   pub fn from_iter<Iter: Clone>(iter: Iter) -> Result<RuntimeConfig>
-  where Iter: IntoIterator<Item = (String, String)> {
+  where
+    Iter: IntoIterator<Item = (String, String)>,
+  {
     let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_iter(iter.clone())?;
     let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_iter(iter.clone())?;
     let acme: ConfigOptsAcme = envy::prefixed("DIPLONAT_ACME_").from_iter(iter.clone())?;
diff --git a/src/config/runtime.rs b/src/config/runtime.rs
index eeb34f6..a1582e4 100644
--- a/src/config/runtime.rs
+++ b/src/config/runtime.rs
@@ -27,7 +27,7 @@ pub struct RuntimeConfigFirewall {
 
 #[derive(Debug)]
 pub struct RuntimeConfigIgd {
-  pub private_ip: String,
+  pub private_ip: Option<String>,
   pub expiration_time: Duration,
   pub refresh_time: Duration,
 }
@@ -59,7 +59,7 @@ impl RuntimeConfig {
 impl RuntimeConfigAcme {
   pub fn new(opts: ConfigOptsAcme) -> Result<Option<Self>> {
     if !opts.enable {
-      return Ok(None)
+      return Ok(None);
     }
 
     let email = opts.email.expect(
@@ -91,9 +91,7 @@ impl RuntimeConfigFirewall {
 
 impl RuntimeConfigIgd {
   pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
-    let private_ip = opts
-      .private_ip
-      .expect("'DIPLONAT_PRIVATE_IP' environment variable is required");
+    let private_ip = opts.private_ip;
     let expiration_time = Duration::from_secs(
       opts
         .expiration_time
@@ -108,7 +106,7 @@ impl RuntimeConfigIgd {
          (currently: {}s)",
         expiration_time.as_secs(),
         refresh_time.as_secs()
-      ))
+      ));
     }
 
     Ok(Self {
diff --git a/src/consul.rs b/src/consul.rs
index 4e6fe5d..4e4f79c 100644
--- a/src/consul.rs
+++ b/src/consul.rs
@@ -25,10 +25,12 @@ impl Consul {
       client: reqwest::Client::new(),
       url: url.to_string(),
       idx: None,
-    }
+    };
   }
 
-  pub fn watch_node_reset(&mut self) -> () { self.idx = None; }
+  pub fn watch_node_reset(&mut self) -> () {
+    self.idx = None;
+  }
 
   pub async fn watch_node(&mut self, host: &str) -> Result<CatalogNode> {
     let url = match self.idx {
@@ -43,6 +45,6 @@ impl Consul {
     };
 
     let resp: CatalogNode = http.json().await?;
-    return Ok(resp)
+    return Ok(resp);
   }
 }
diff --git a/src/consul_actor.rs b/src/consul_actor.rs
index b111f09..61789ca 100644
--- a/src/consul_actor.rs
+++ b/src/consul_actor.rs
@@ -4,7 +4,7 @@ use anyhow::Result;
 use log::*;
 use serde::{Deserialize, Serialize};
 use serde_lexpr::{error, from_str};
-use tokio::{sync::watch, time::delay_for};
+use tokio::{sync::watch, time::sleep};
 
 use crate::{consul, messages};
 
@@ -35,7 +35,7 @@ fn retry_to_time(retries: u32, max_time: Duration) -> Duration {
   return Duration::from_secs(cmp::min(
     max_time.as_secs(),
     1.2f64.powf(retries as f64) as u64,
-  ))
+  ));
 }
 
 fn to_parameters(catalog: &consul::CatalogNode) -> Vec<DiplonatConsul> {
@@ -51,7 +51,7 @@ fn to_parameters(catalog: &consul::CatalogNode) -> Vec<DiplonatConsul> {
     }
   }
 
-  return r
+  return r;
 }
 
 fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
@@ -70,7 +70,7 @@ fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
     }
   }
 
-  return op
+  return op;
 }
 
 impl ConsulActor {
@@ -86,7 +86,7 @@ impl ConsulActor {
       tx_open_ports: tx,
       node: node.to_string(),
       retries: 0,
-    }
+    };
   }
 
   pub async fn listen(&mut self) -> Result<()> {
@@ -102,15 +102,15 @@ impl ConsulActor {
             will_retry_in.as_secs(),
             e
           );
-          delay_for(will_retry_in).await;
-          continue
+          sleep(will_retry_in).await;
+          continue;
         }
       };
       self.retries = 0;
       let msg = to_open_ports(&to_parameters(&catalog));
       debug!("Extracted configuration: {:#?}", msg);
 
-      self.tx_open_ports.broadcast(msg)?;
+      self.tx_open_ports.send(msg)?;
     }
   }
 }
diff --git a/src/diplonat.rs b/src/diplonat.rs
index 496f0ab..397ba82 100644
--- a/src/diplonat.rs
+++ b/src/diplonat.rs
@@ -21,7 +21,7 @@ impl Diplonat {
     let fw = FirewallActor::new(rt_cfg.firewall.refresh_time, &ca.rx_open_ports).await?;
 
     let ia = IgdActor::new(
-      &rt_cfg.igd.private_ip,
+      rt_cfg.igd.private_ip.as_ref().map(String::as_str),
       rt_cfg.igd.refresh_time,
       rt_cfg.igd.expiration_time,
       &ca.rx_open_ports,
@@ -34,7 +34,7 @@ impl Diplonat {
       firewall: fw,
     };
 
-    return Ok(ctx)
+    return Ok(ctx);
   }
 
   pub async fn listen(&mut self) -> Result<()> {
@@ -44,6 +44,6 @@ impl Diplonat {
       self.firewall.listen()
     )?;
 
-    return Ok(())
+    return Ok(());
   }
 }
diff --git a/src/fw_actor.rs b/src/fw_actor.rs
index 0fa6e64..ac553b1 100644
--- a/src/fw_actor.rs
+++ b/src/fw_actor.rs
@@ -32,7 +32,7 @@ impl FirewallActor {
 
     fw::setup(&ctx.ipt)?;
 
-    return Ok(ctx)
+    return Ok(ctx);
   }
 
   pub async fn listen(&mut self) -> Result<()> {
@@ -40,7 +40,7 @@ impl FirewallActor {
     loop {
       // 1. Wait for an event
       let new_ports = select! {
-        Some(ports) = self.rx_ports.recv() => Some(ports),
+        _ = self.rx_ports.changed() => Some(self.rx_ports.borrow().clone()),
         _ = interval.tick() => None,
         else => return Ok(()) // Sender dropped, terminate loop.
       };
@@ -81,6 +81,6 @@ impl FirewallActor {
 
     fw::open_ports(&self.ipt, ports_to_open)?;
 
-    return Ok(())
+    return Ok(());
   }
 }
diff --git a/src/igd_actor.rs b/src/igd_actor.rs
index bb9099e..d32f5dc 100644
--- a/src/igd_actor.rs
+++ b/src/igd_actor.rs
@@ -22,7 +22,7 @@ pub struct IgdActor {
 
 impl IgdActor {
   pub async fn new(
-    priv_ip: &str,
+    priv_ip: Option<&str>,
     refresh: Duration,
     expire: Duration,
     rxp: &watch::Receiver<messages::PublicExposedPorts>,
@@ -32,16 +32,44 @@ impl IgdActor {
       .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.to_string()
+    } 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()
+        ),
+      };
+      let public_ip = get_if_addrs::get_if_addrs()?
+        .into_iter()
+        .map(|i| i.addr.ip())
+        .filter(|a| match a {
+          std::net::IpAddr::V4(a4) => (a4.octets()[..cmplen] == gwa[..cmplen]),
+          _ => false,
+        })
+        .next()
+        .expect("No interface has an IP on same subnet as gateway")
+        .to_string();
+      info!("Found private IP: {}", public_ip);
+      public_ip
+    };
+
     let ctx = Self {
       gateway: gw,
       rx_ports: rxp.clone(),
-      private_ip: priv_ip.to_string(),
+      private_ip,
       refresh: refresh,
       expire: expire,
       last_ports: messages::PublicExposedPorts::new(),
     };
 
-    return Ok(ctx)
+    return Ok(ctx);
   }
 
   pub async fn listen(&mut self) -> Result<()> {
@@ -49,7 +77,7 @@ impl IgdActor {
     loop {
       // 1. Wait for an event
       let new_ports = select! {
-        Some(ports) = self.rx_ports.recv() => Some(ports),
+        _ = self.rx_ports.changed() => Some(self.rx_ports.borrow().clone()),
         _ = interval.tick() => None,
         else => return Ok(()) // Sender dropped, terminate loop.
       };
@@ -93,6 +121,6 @@ impl IgdActor {
       }
     }
 
-    return Ok(())
+    return Ok(());
   }
 }
diff --git a/src/messages.rs b/src/messages.rs
index b622be1..63f16b0 100644
--- a/src/messages.rs
+++ b/src/messages.rs
@@ -11,6 +11,6 @@ impl PublicExposedPorts {
     return Self {
       tcp_ports: HashSet::new(),
       udp_ports: HashSet::new(),
-    }
+    };
   }
 }