v1.16.5

changelog.md

@@ -1,5 +1,48 @@
 # Changelog
 
+## 2026-03-31 - 1.16.5 - fix(rust-userspace-nat)
+improve TCP session backpressure, buffering, and idle cleanup in userspace NAT
+
+- apply proper bridge-channel backpressure by reserving channel capacity before consuming smoltcp TCP data
+- defer bridge sender initialization until the bridge task starts and track TCP session activity timestamps
+- cap per-session pending TCP send buffers at 512KB and abort stalled sessions when clients cannot keep up
+- add idle TCP session cleanup and switch NAT polling to a dynamic smoltcp-driven delay
+
+## 2026-03-31 - 1.16.4 - fix(server)
+register preloaded WireGuard clients as peers on server startup
+
+- Adds configured clients from the runtime registry to the WireGuard listener when the server starts.
+- Ensures clients loaded from config can complete WireGuard handshakes without requiring separate peer registration.
+- Logs a warning if automatic peer registration fails for an individual client.
+
+## 2026-03-31 - 1.16.3 - fix(rust-nat)
+defer TCP bridge startup until handshake completion and buffer partial NAT socket writes
+
+- Start TCP bridge tasks only after the smoltcp socket becomes active to prevent server data from arriving before the client handshake completes.
+- Buffer pending TCP payloads and flush partial writes so bridge-to-socket data is not silently lost under backpressure.
+- Keep closing TCP sessions alive until FIN processing completes and add logging for dropped packets when bridge or route channels are full.
+
+## 2026-03-31 - 1.16.2 - fix(wireguard)
+sync runtime peer management with client registration and derive the correct server public key from the WireGuard private key
+
+- Register, remove, and rotate WireGuard peers in the running listener when clients are added, deleted, or rekeyed.
+- Generate client WireGuard configs with the public key derived from the configured WireGuard private key instead of reusing the generic server public key.
+- Handle expired WireGuard sessions by re-initiating handshakes and mark client state as handshaking until the tunnel becomes active.
+- Improve allowed IP matching and peer VPN IP extraction for runtime packet routing.
+
+## 2026-03-30 - 1.16.1 - fix(rust/server)
+add serde alias for clientAllowedIPs in server config
+
+- Accepts the camelCase clientAllowedIPs field when deserializing server configuration.
+- Improves compatibility with existing or external configuration formats without changing runtime behavior.
+
+## 2026-03-30 - 1.16.0 - feat(server)
+add configurable client endpoint and allowed IPs for generated VPN configs
+
+- adds serverEndpoint to generated SmartVPN and WireGuard client configs so remote clients can use a public address instead of the listen address
+- adds clientAllowedIPs to generated WireGuard configs to support full-tunnel or split-tunnel routing
+- updates TypeScript interfaces to expose the new server configuration options
+
 ## 2026-03-30 - 1.15.0 - feat(vpnserver)
 add nftables-backed destination policy enforcement for TUN mode
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartvpn",
-  "version": "1.15.0",
+  "version": "1.16.5",
   "private": false,
   "description": "A VPN solution with TypeScript control plane and Rust data plane daemon",
   "type": "module",

rust/src/server.rs

@@ -7,7 +7,7 @@ use std::sync::Arc;
 use std::time::Duration;
 use tokio::net::TcpListener;
 use tokio::sync::{mpsc, Mutex, RwLock};
-use tracing::{info, error, warn};
+use tracing::{debug, info, error, warn};
 
 use crate::acl;
 use crate::client_registry::{ClientEntry, ClientRegistry};
@@ -84,6 +84,14 @@ pub struct ServerConfig {
     pub wg_listen_port: Option<u16>,
     /// WireGuard: pre-configured peers.
     pub wg_peers: Option<Vec<crate::wireguard::WgPeerConfig>>,
+    /// Public endpoint address for generated client configs (e.g. "vpn.example.com:51820").
+    /// Used as WireGuard `Endpoint` and SmartVPN `serverUrl` host.
+    /// Defaults to listen_addr.
+    pub server_endpoint: Option<String>,
+    /// AllowedIPs for generated WireGuard client configs.
+    /// Defaults to ["0.0.0.0/0"] (full tunnel).
+    #[serde(alias = "clientAllowedIPs")]
+    pub client_allowed_ips: Option<Vec<String>>,
 }
 
 /// Information about a connected client.
@@ -364,6 +372,28 @@ impl VpnServer {
         }
 
         info!("VPN server started (transport: {})", transport_mode);
+
+        // Register pre-loaded clients (from config.clients) as WG peers.
+        // The WG listener only starts with config.wg_peers; clients loaded into the
+        // registry need to be dynamically added so WG handshakes work.
+        if self.wg_command_tx.is_some() {
+            let registry = state.client_registry.read().await;
+            for entry in registry.list() {
+                if let (Some(ref wg_key), Some(ref ip_str)) = (&entry.wg_public_key, &entry.assigned_ip) {
+                    let peer_config = crate::wireguard::WgPeerConfig {
+                        public_key: wg_key.clone(),
+                        preshared_key: None,
+                        allowed_ips: vec![format!("{}/32", ip_str)],
+                        endpoint: None,
+                        persistent_keepalive: Some(25),
+                    };
+                    if let Err(e) = self.add_wg_peer(peer_config).await {
+                        warn!("Failed to register pre-loaded WG peer for {}: {}", entry.client_id, e);
+                    }
+                }
+            }
+        }
+
         Ok(())
     }
 
@@ -586,10 +616,27 @@ impl VpnServer {
         // Add to registry
         state.client_registry.write().await.add(entry.clone())?;
 
+        // Register WG peer with the running WG listener (if active)
+        if self.wg_command_tx.is_some() {
+            let wg_peer_config = crate::wireguard::WgPeerConfig {
+                public_key: wg_pub.clone(),
+                preshared_key: None,
+                allowed_ips: vec![format!("{}/32", assigned_ip)],
+                endpoint: None,
+                persistent_keepalive: Some(25),
+            };
+            if let Err(e) = self.add_wg_peer(wg_peer_config).await {
+                warn!("Failed to register WG peer for client {}: {}", client_id, e);
+            }
+        }
+
         // Build SmartVPN client config
+        let smartvpn_server_url = format!("wss://{}",
+            state.config.server_endpoint.as_deref()
+                .unwrap_or(&state.config.listen_addr)
+                .replace("0.0.0.0", "localhost"));
         let smartvpn_config = serde_json::json!({
-            "serverUrl": format!("wss://{}",
-                state.config.listen_addr.replace("0.0.0.0", "localhost")),
+            "serverUrl": smartvpn_server_url,
             "serverPublicKey": state.config.public_key,
             "clientPrivateKey": noise_priv,
             "clientPublicKey": noise_pub,
@@ -599,15 +646,25 @@ impl VpnServer {
         });
 
         // Build WireGuard config string
+        let wg_server_pubkey = match &state.config.wg_private_key {
+            Some(wg_priv_key) => crate::wireguard::wg_public_key_from_private(wg_priv_key)?,
+            None => state.config.public_key.clone(),
+        };
+        let wg_endpoint = state.config.server_endpoint.as_deref()
+            .unwrap_or(&state.config.listen_addr);
+        let wg_allowed_ips = state.config.client_allowed_ips.as_ref()
+            .map(|ips| ips.join(", "))
+            .unwrap_or_else(|| "0.0.0.0/0".to_string());
         let wg_config = format!(
-            "[Interface]\nPrivateKey = {}\nAddress = {}/24\n{}\n[Peer]\nPublicKey = {}\nAllowedIPs = 0.0.0.0/0\nEndpoint = {}\nPersistentKeepalive = 25\n",
+            "[Interface]\nPrivateKey = {}\nAddress = {}/24\n{}\n[Peer]\nPublicKey = {}\nAllowedIPs = {}\nEndpoint = {}\nPersistentKeepalive = 25\n",
             wg_priv,
             assigned_ip,
             state.config.dns.as_ref()
                 .map(|d| format!("DNS = {}", d.join(", ")))
                 .unwrap_or_default(),
-            state.config.public_key,
-            state.config.listen_addr,
+            wg_server_pubkey,
+            wg_allowed_ips,
+            wg_endpoint,
         );
 
         let entry_json = serde_json::to_value(&entry)?;
@@ -628,6 +685,14 @@ impl VpnServer {
         let state = self.state.as_ref()
             .ok_or_else(|| anyhow::anyhow!("Server not running"))?;
         let entry = state.client_registry.write().await.remove(client_id)?;
+        // Remove WG peer from running listener
+        if self.wg_command_tx.is_some() {
+            if let Some(ref wg_key) = entry.wg_public_key {
+                if let Err(e) = self.remove_wg_peer(wg_key).await {
+                    debug!("Failed to remove WG peer for client {}: {}", client_id, e);
+                }
+            }
+        }
         // Release the IP if assigned
         if let Some(ref ip_str) = entry.assigned_ip {
             if let Ok(ip) = ip_str.parse::<Ipv4Addr>() {
@@ -714,6 +779,14 @@ impl VpnServer {
         let state = self.state.as_ref()
             .ok_or_else(|| anyhow::anyhow!("Server not running"))?;
 
+        // Capture old WG key before rotation (needed to remove from WG listener)
+        let old_wg_pub = {
+            let registry = state.client_registry.read().await;
+            let entry = registry.get_by_id(client_id)
+                .ok_or_else(|| anyhow::anyhow!("Client '{}' not found", client_id))?;
+            entry.wg_public_key.clone()
+        };
+
         let (noise_pub, noise_priv) = crypto::generate_keypair()?;
         let (wg_pub, wg_priv) = crate::wireguard::generate_wg_keypair();
 
@@ -732,9 +805,31 @@ impl VpnServer {
             .and_then(|v| v.as_str())
             .unwrap_or("0.0.0.0");
 
+        // Update WG listener: remove old peer, add new peer
+        if self.wg_command_tx.is_some() {
+            if let Some(ref old_key) = old_wg_pub {
+                if let Err(e) = self.remove_wg_peer(old_key).await {
+                    debug!("Failed to remove old WG peer during rotation: {}", e);
+                }
+            }
+            let wg_peer_config = crate::wireguard::WgPeerConfig {
+                public_key: wg_pub.clone(),
+                preshared_key: None,
+                allowed_ips: vec![format!("{}/32", assigned_ip)],
+                endpoint: None,
+                persistent_keepalive: Some(25),
+            };
+            if let Err(e) = self.add_wg_peer(wg_peer_config).await {
+                warn!("Failed to register new WG peer during rotation: {}", e);
+            }
+        }
+
+        let smartvpn_server_url = format!("wss://{}",
+            state.config.server_endpoint.as_deref()
+                .unwrap_or(&state.config.listen_addr)
+                .replace("0.0.0.0", "localhost"));
         let smartvpn_config = serde_json::json!({
-            "serverUrl": format!("wss://{}",
-                state.config.listen_addr.replace("0.0.0.0", "localhost")),
+            "serverUrl": smartvpn_server_url,
             "serverPublicKey": state.config.public_key,
             "clientPrivateKey": noise_priv,
             "clientPublicKey": noise_pub,
@@ -743,14 +838,24 @@ impl VpnServer {
             "keepaliveIntervalSecs": state.config.keepalive_interval_secs,
         });
 
+        let wg_server_pubkey = match &state.config.wg_private_key {
+            Some(wg_priv_key) => crate::wireguard::wg_public_key_from_private(wg_priv_key)?,
+            None => state.config.public_key.clone(),
+        };
+        let wg_endpoint = state.config.server_endpoint.as_deref()
+            .unwrap_or(&state.config.listen_addr);
+        let wg_allowed_ips = state.config.client_allowed_ips.as_ref()
+            .map(|ips| ips.join(", "))
+            .unwrap_or_else(|| "0.0.0.0/0".to_string());
         let wg_config = format!(
-            "[Interface]\nPrivateKey = {}\nAddress = {}/24\n{}\n[Peer]\nPublicKey = {}\nAllowedIPs = 0.0.0.0/0\nEndpoint = {}\nPersistentKeepalive = 25\n",
+            "[Interface]\nPrivateKey = {}\nAddress = {}/24\n{}\n[Peer]\nPublicKey = {}\nAllowedIPs = {}\nEndpoint = {}\nPersistentKeepalive = 25\n",
             wg_priv, assigned_ip,
             state.config.dns.as_ref()
                 .map(|d| format!("DNS = {}", d.join(", ")))
                 .unwrap_or_default(),
-            state.config.public_key,
-            state.config.listen_addr,
+            wg_server_pubkey,
+            wg_allowed_ips,
+            wg_endpoint,
         );
 
         Ok(serde_json::json!({
@@ -774,10 +879,13 @@ impl VpnServer {
 
         match format {
             "smartvpn" => {
+                let smartvpn_server_url = format!("wss://{}",
+                    state.config.server_endpoint.as_deref()
+                        .unwrap_or(&state.config.listen_addr)
+                        .replace("0.0.0.0", "localhost"));
                 Ok(serde_json::json!({
                     "config": {
-                        "serverUrl": format!("wss://{}",
-                            state.config.listen_addr.replace("0.0.0.0", "localhost")),
+                        "serverUrl": smartvpn_server_url,
                         "serverPublicKey": state.config.public_key,
                         "clientPublicKey": entry.public_key,
                         "dns": state.config.dns,
@@ -787,15 +895,25 @@ impl VpnServer {
                 }))
             }
             "wireguard" => {
+                let wg_server_pubkey = match &state.config.wg_private_key {
+                    Some(wg_priv_key) => crate::wireguard::wg_public_key_from_private(wg_priv_key)?,
+                    None => state.config.public_key.clone(),
+                };
                 let assigned_ip = entry.assigned_ip.as_deref().unwrap_or("0.0.0.0");
+                let wg_endpoint = state.config.server_endpoint.as_deref()
+                    .unwrap_or(&state.config.listen_addr);
+                let wg_allowed_ips = state.config.client_allowed_ips.as_ref()
+                    .map(|ips| ips.join(", "))
+                    .unwrap_or_else(|| "0.0.0.0/0".to_string());
                 let config = format!(
-                    "[Interface]\nAddress = {}/24\n{}\n[Peer]\nPublicKey = {}\nAllowedIPs = 0.0.0.0/0\nEndpoint = {}\nPersistentKeepalive = 25\n",
+                    "[Interface]\nAddress = {}/24\n{}\n[Peer]\nPublicKey = {}\nAllowedIPs = {}\nEndpoint = {}\nPersistentKeepalive = 25\n",
                     assigned_ip,
                     state.config.dns.as_ref()
                         .map(|d| format!("DNS = {}", d.join(", ")))
                         .unwrap_or_default(),
-                    state.config.public_key,
-                    state.config.listen_addr,
+                    wg_server_pubkey,
+                    wg_allowed_ips,
+                    wg_endpoint,
                 );
                 Ok(serde_json::json!({ "config": config }))
             }

rust/src/userspace_nat.rs

@@ -17,6 +17,10 @@ use crate::acl;
 use crate::server::{DestinationPolicyConfig, ServerState};
 use crate::tunnel;
 
+/// Maximum size of per-session pending send buffer (512KB = 8x socket buffer).
+/// Sessions exceeding this are aborted — the client cannot keep up.
+const TCP_PENDING_SEND_MAX: usize = 512 * 1024;
+
 // ============================================================================
 // Virtual IP device for smoltcp
 // ============================================================================
@@ -101,7 +105,7 @@ impl Device for VirtualIpDevice {
         let mut caps = DeviceCapabilities::default();
         caps.medium = Medium::Ip;
         caps.max_transmission_unit = self.mtu;
-        caps.max_burst_size = Some(1);
+        caps.max_burst_size = None;
         caps
     }
 }
@@ -121,9 +125,20 @@ struct SessionKey {
 
 struct TcpSession {
     smoltcp_handle: SocketHandle,
-    bridge_data_tx: mpsc::Sender<Vec<u8>>,
+    /// Channel to send data to the bridge task. None until bridge starts.
+    bridge_data_tx: Option<mpsc::Sender<Vec<u8>>>,
     #[allow(dead_code)]
     client_ip: Ipv4Addr,
+    /// Bridge task has been spawned (deferred until handshake completes)
+    bridge_started: bool,
+    /// Address to connect the bridge task to (may differ from dst if policy rewrote it)
+    connect_addr: SocketAddr,
+    /// Buffered data from bridge waiting to be written to smoltcp socket
+    pending_send: Vec<u8>,
+    /// Session is closing (FIN in progress), don't accept new SYNs
+    closing: bool,
+    /// Last time data flowed through this session (for idle timeout)
+    last_activity: tokio::time::Instant,
 }
 
 struct UdpSession {
@@ -308,7 +323,9 @@ impl NatEngine {
 
                 // SYN without ACK = new connection
                 let is_syn = (flags & 0x02) != 0 && (flags & 0x10) == 0;
-                if is_syn && !self.tcp_sessions.contains_key(&key) {
+                // Skip if session exists (including closing sessions — let FIN complete)
+                let session_exists = self.tcp_sessions.contains_key(&key);
+                if is_syn && !session_exists {
                     match self.evaluate_destination(dst_ip, dst_port) {
                         DestinationAction::Drop => {
                             debug!("NAT: destination policy blocked TCP {}:{} -> {}:{}", src_ip, src_port, dst_ip, dst_port);
@@ -375,23 +392,22 @@ impl NatEngine {
 
         let handle = self.sockets.add(socket);
 
-        // Channel for sending data from NAT engine to bridge task
-        let (data_tx, data_rx) = mpsc::channel::<Vec<u8>>(256);
-
         let session = TcpSession {
             smoltcp_handle: handle,
-            bridge_data_tx: data_tx,
+            bridge_data_tx: None,
             client_ip: key.src_ip,
+            bridge_started: false,
+            connect_addr,
+            pending_send: Vec::new(),
+            closing: false,
+            last_activity: tokio::time::Instant::now(),
         };
         self.tcp_sessions.insert(key.clone(), session);
 
-        // Spawn bridge task that connects to the resolved destination
-        let bridge_tx = self.bridge_tx.clone();
-        let key_clone = key.clone();
-        let proxy_protocol = self.proxy_protocol;
-        tokio::spawn(async move {
-            tcp_bridge_task(key_clone, data_rx, bridge_tx, proxy_protocol, connect_addr).await;
-        });
+        // NOTE: Bridge task is NOT spawned here — it will be spawned in process()
+        // once the smoltcp handshake completes (socket.is_active() == true).
+        // This prevents data from the real server arriving before the VPN client
+        // handshake is done, which would cause silent data loss.
 
         debug!(
             "NAT: new TCP session {}:{} -> {}:{}",
@@ -451,15 +467,69 @@ impl NatEngine {
         self.iface
             .poll(now, &mut self.device, &mut self.sockets);
 
+        // Start bridge tasks for sessions whose handshake just completed
+        let bridge_tx_clone = self.bridge_tx.clone();
+        let proxy_protocol = self.proxy_protocol;
+        for (key, session) in self.tcp_sessions.iter_mut() {
+            if !session.bridge_started && !session.closing {
+                let socket = self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
+                if socket.is_active() {
+                    session.bridge_started = true;
+                    let (data_tx, data_rx) = mpsc::channel::<Vec<u8>>(256);
+                    session.bridge_data_tx = Some(data_tx);
+                    let btx = bridge_tx_clone.clone();
+                    let k = key.clone();
+                    let addr = session.connect_addr;
+                    let pp = proxy_protocol;
+                    tokio::spawn(async move {
+                        tcp_bridge_task(k, data_rx, btx, pp, addr).await;
+                    });
+                    debug!("NAT: TCP handshake complete, starting bridge for {}:{} -> {}:{}",
+                        key.src_ip, key.src_port, key.dst_ip, key.dst_port);
+                }
+            }
+        }
+
+        // Flush pending send buffers to smoltcp sockets
+        for (_key, session) in self.tcp_sessions.iter_mut() {
+            if !session.pending_send.is_empty() {
+                let socket = self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
+                if socket.can_send() {
+                    match socket.send_slice(&session.pending_send) {
+                        Ok(written) if written > 0 => {
+                            session.pending_send.drain(..written);
+                        }
+                        _ => {}
+                    }
+                }
+            }
+        }
+
         // Bridge: read data from smoltcp TCP sockets → send to bridge tasks
         let mut closed_tcp: Vec<SessionKey> = Vec::new();
+        let mut active_tcp: Vec<SessionKey> = Vec::new();
         for (key, session) in &self.tcp_sessions {
             let socket = self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
-            if socket.can_recv() {
-                let _ = socket.recv(|data| {
-                    let _ = session.bridge_data_tx.try_send(data.to_vec());
-                    (data.len(), ())
-                });
+            if session.bridge_started && socket.can_recv() {
+                if let Some(ref sender) = session.bridge_data_tx {
+                    // Reserve channel slot BEFORE consuming from smoltcp.
+                    // If the channel is full, we don't consume — smoltcp's RX buffer
+                    // fills up, it stops advertising TCP window space, and the VPN
+                    // client's TCP stack backs off. Proper end-to-end backpressure.
+                    match sender.try_reserve() {
+                        Ok(permit) => {
+                            let _ = socket.recv(|data| {
+                                permit.send(data.to_vec());
+                                (data.len(), ())
+                            });
+                            active_tcp.push(key.clone());
+                        }
+                        Err(_) => {
+                            debug!("NAT: bridge channel full for {}:{} -> {}:{}, applying backpressure",
+                                key.src_ip, key.src_port, key.dst_ip, key.dst_port);
+                        }
+                    }
+                }
             }
             // Detect closed connections
             if !socket.is_open() && !socket.is_listening() {
@@ -467,6 +537,14 @@ impl NatEngine {
             }
         }
 
+        // Update last_activity for sessions that had data flow
+        let now = tokio::time::Instant::now();
+        for key in active_tcp {
+            if let Some(session) = self.tcp_sessions.get_mut(&key) {
+                session.last_activity = now;
+            }
+        }
+
         // Clean up closed TCP sessions
         for key in closed_tcp {
             if let Some(session) = self.tcp_sessions.remove(&key) {
@@ -479,7 +557,9 @@ impl NatEngine {
         for (_key, session) in &self.udp_sessions {
             let socket = self.sockets.get_mut::<udp::Socket>(session.smoltcp_handle);
             while let Ok((data, _meta)) = socket.recv() {
-                let _ = session.bridge_data_tx.try_send(data.to_vec());
+                if session.bridge_data_tx.try_send(data.to_vec()).is_err() {
+                    debug!("NAT: bridge channel full, UDP data dropped");
+                }
             }
         }
 
@@ -488,7 +568,9 @@ impl NatEngine {
         for packet in self.device.drain_tx() {
             if let Some(std::net::IpAddr::V4(dst_ip)) = tunnel::extract_dst_ip(&packet) {
                 if let Some(sender) = routes.get(&dst_ip) {
-                    let _ = sender.try_send(packet);
+                    if sender.try_send(packet).is_err() {
+                        debug!("NAT: tun_routes channel full for {}, packet dropped", dst_ip);
+                    }
                 }
             }
         }
@@ -497,22 +579,43 @@ impl NatEngine {
     fn handle_bridge_message(&mut self, msg: BridgeMessage) {
         match msg {
             BridgeMessage::TcpData { key, data } => {
-                if let Some(session) = self.tcp_sessions.get(&key) {
+                if let Some(session) = self.tcp_sessions.get_mut(&key) {
+                    session.last_activity = tokio::time::Instant::now();
+                    // Append to pending buffer, then flush as much as possible
+                    session.pending_send.extend_from_slice(&data);
                     let socket =
                         self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
-                    if socket.can_send() {
-                        let _ = socket.send_slice(&data);
+                    if socket.can_send() && !session.pending_send.is_empty() {
+                        match socket.send_slice(&session.pending_send) {
+                            Ok(written) if written > 0 => {
+                                session.pending_send.drain(..written);
+                            }
+                            _ => {}
+                        }
+                    }
+                    // Cap check — abort session if client can't keep up
+                    if session.pending_send.len() > TCP_PENDING_SEND_MAX {
+                        warn!(
+                            "NAT: TCP session {}:{} -> {}:{} pending buffer exceeded {}KB, aborting",
+                            key.src_ip, key.src_port, key.dst_ip, key.dst_port,
+                            TCP_PENDING_SEND_MAX / 1024
+                        );
+                        let socket =
+                            self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
+                        socket.abort();
+                        session.pending_send.clear();
+                        session.closing = true;
                     }
                 }
             }
             BridgeMessage::TcpClosed { key } => {
-                if let Some(session) = self.tcp_sessions.remove(&key) {
+                if let Some(session) = self.tcp_sessions.get_mut(&key) {
                     let socket =
                         self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
                     socket.close();
+                    session.closing = true;
                     // Don't remove from SocketSet yet — let smoltcp send FIN
                     // It will be cleaned up in process() when is_open() returns false
-                    self.tcp_sessions.insert(key, session);
                 }
             }
             BridgeMessage::UdpData { key, data } => {
@@ -552,6 +655,29 @@ impl NatEngine {
         }
     }
 
+    fn cleanup_idle_tcp_sessions(&mut self) {
+        let timeout = Duration::from_secs(300); // 5 minutes
+        let now = tokio::time::Instant::now();
+        let expired: Vec<SessionKey> = self
+            .tcp_sessions
+            .iter()
+            .filter(|(_, s)| now.duration_since(s.last_activity) > timeout)
+            .map(|(k, _)| k.clone())
+            .collect();
+
+        for key in expired {
+            if let Some(session) = self.tcp_sessions.remove(&key) {
+                let socket = self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
+                socket.abort();
+                self.sockets.remove(session.smoltcp_handle);
+                warn!(
+                    "NAT: TCP session timed out {}:{} -> {}:{}",
+                    key.src_ip, key.src_port, key.dst_ip, key.dst_port
+                );
+            }
+        }
+    }
+
     /// Main async event loop for the NAT engine.
     pub async fn run(
         mut self,
@@ -559,9 +685,13 @@ impl NatEngine {
         mut shutdown_rx: mpsc::Receiver<()>,
     ) -> Result<()> {
         info!("Userspace NAT engine started");
-        let mut timer = tokio::time::interval(Duration::from_millis(50));
+        let default_poll_delay = Duration::from_millis(50);
         let mut cleanup_timer = tokio::time::interval(Duration::from_secs(10));
 
+        // Dynamic poll timer — reset after each event using smoltcp's poll_delay()
+        let poll_sleep = tokio::time::sleep(default_poll_delay);
+        tokio::pin!(poll_sleep);
+
         loop {
             tokio::select! {
                 Some(packet) = packet_rx.recv() => {
@@ -572,18 +702,26 @@ impl NatEngine {
                     self.handle_bridge_message(msg);
                     self.process().await;
                 }
-                _ = timer.tick() => {
+                () = &mut poll_sleep => {
                     // Periodic poll for smoltcp maintenance (TCP retransmit, etc.)
                     self.process().await;
                 }
                 _ = cleanup_timer.tick() => {
                     self.cleanup_idle_udp_sessions();
+                    self.cleanup_idle_tcp_sessions();
                 }
                 _ = shutdown_rx.recv() => {
                     info!("Userspace NAT engine shutting down");
                     break;
                 }
             }
+
+            // Reset poll delay based on smoltcp's actual timer needs
+            let now = self.smoltcp_now();
+            let delay = self.iface.poll_delay(now, &self.sockets)
+                .map(|d| Duration::from_millis(d.total_millis()))
+                .unwrap_or(default_poll_delay);
+            poll_sleep.as_mut().reset(tokio::time::Instant::now() + delay);
         }
 
         Ok(())

rust/src/wireguard.rs

@@ -5,6 +5,7 @@ use std::sync::Arc;
 use anyhow::{anyhow, Result};
 use base64::engine::general_purpose::STANDARD as BASE64;
 use base64::Engine;
+use boringtun::noise::errors::WireGuardError;
 use boringtun::noise::rate_limiter::RateLimiter;
 use boringtun::noise::{Tunn, TunnResult};
 use boringtun::x25519::{PublicKey, StaticSecret};
@@ -99,6 +100,13 @@ pub fn generate_wg_keypair() -> (String, String) {
     (pub_b64, priv_b64)
 }
 
+/// Derive the WireGuard public key (base64) from a private key (base64).
+pub fn wg_public_key_from_private(private_key_b64: &str) -> Result<String> {
+    let private = parse_private_key(private_key_b64)?;
+    let public = PublicKey::from(&private);
+    Ok(BASE64.encode(public.to_bytes()))
+}
+
 fn parse_private_key(b64: &str) -> Result<StaticSecret> {
     let bytes = BASE64.decode(b64)?;
     if bytes.len() != 32 {
@@ -215,8 +223,8 @@ struct PeerState {
 }
 
 impl PeerState {
-    fn matches_dst(&self, dst_ip: IpAddr) -> bool {
-        self.allowed_ips.iter().any(|aip| aip.matches(dst_ip))
+    fn matches_allowed_ips(&self, ip: IpAddr) -> bool {
+        self.allowed_ips.iter().any(|aip| aip.matches(ip))
     }
 }
 
@@ -286,9 +294,10 @@ pub struct WgListenerConfig {
     pub peers: Vec<WgPeerConfig>,
 }
 
-/// Extract the first /32 IPv4 address from a list of AllowedIp entries.
-/// This is the peer's VPN IP used for return-packet routing.
+/// Extract the peer's VPN IP from AllowedIp entries.
+/// Prefers /32 entries (exact match); falls back to any IPv4 address.
 fn extract_peer_vpn_ip(allowed_ips: &[AllowedIp]) -> Option<Ipv4Addr> {
+    // Prefer /32 entries (exact peer VPN IP)
     for aip in allowed_ips {
         if let IpAddr::V4(v4) = aip.addr {
             if aip.prefix_len == 32 {
@@ -296,6 +305,12 @@ fn extract_peer_vpn_ip(allowed_ips: &[AllowedIp]) -> Option<Ipv4Addr> {
             }
         }
     }
+    // Fallback: use the first IPv4 address from any prefix length
+    for aip in allowed_ips {
+        if let IpAddr::V4(v4) = aip.addr {
+            return Some(v4);
+        }
+    }
     None
 }
 
@@ -495,7 +510,7 @@ pub async fn run_wg_listener(
                             break;
                         }
                         TunnResult::WriteToTunnelV4(packet, addr) => {
-                            if peer.matches_dst(IpAddr::V4(addr)) {
+                            if peer.matches_allowed_ips(IpAddr::V4(addr)) {
                                 let pkt_len = packet.len() as u64;
                                 // Forward via shared forwarding engine
                                 let mut engine = state.forwarding_engine.lock().await;
@@ -519,7 +534,7 @@ pub async fn run_wg_listener(
                             break;
                         }
                         TunnResult::WriteToTunnelV6(packet, addr) => {
-                            if peer.matches_dst(IpAddr::V6(addr)) {
+                            if peer.matches_allowed_ips(IpAddr::V6(addr)) {
                                 let pkt_len = packet.len() as u64;
                                 let mut engine = state.forwarding_engine.lock().await;
                                 match &mut *engine {
@@ -586,6 +601,9 @@ pub async fn run_wg_listener(
                                 udp_socket.send_to(packet, endpoint).await?;
                             }
                         }
+                        TunnResult::Err(WireGuardError::ConnectionExpired) => {
+                            warn!("WG peer {} connection expired", peer.public_key_b64);
+                        }
                         TunnResult::Err(e) => {
                             debug!("Timer error for WG peer {}: {:?}",
                                 peer.public_key_b64, e);
@@ -796,12 +814,12 @@ impl WgClient {
         let state = self.state.clone();
         let assigned_ip = config.address.clone();
 
-        // Update state
+        // Update state — handshake hasn't completed yet
         {
             let mut s = state.write().await;
-            s.state = "connected".to_string();
+            s.state = "handshaking".to_string();
             s.assigned_ip = Some(assigned_ip.clone());
-            s.connected_since = Some(chrono_now());
+            s.connected_since = None;
         }
 
         // Spawn client loop
@@ -868,7 +886,7 @@ async fn wg_client_loop(
     endpoint: SocketAddr,
     _allowed_ips: Vec<AllowedIp>,
     shared_stats: Arc<RwLock<WgPeerStats>>,
-    _state: Arc<RwLock<WgClientState>>,
+    state: Arc<RwLock<WgClientState>>,
     mut shutdown_rx: oneshot::Receiver<()>,
 ) -> Result<()> {
     let mut udp_buf = vec![0u8; MAX_UDP_PACKET];
@@ -876,6 +894,7 @@ async fn wg_client_loop(
     let mut dst_buf = vec![0u8; WG_BUFFER_SIZE];
     let mut timer = tokio::time::interval(std::time::Duration::from_millis(TIMER_TICK_MS));
     let mut stats_timer = tokio::time::interval(std::time::Duration::from_secs(1));
+    let mut handshake_complete = false;
 
     let (mut tun_reader, mut tun_writer) = tokio::io::split(tun_device);
 
@@ -916,14 +935,37 @@ async fn wg_client_loop(
                         tun_writer.write_all(packet).await?;
                         local_stats.bytes_received += pkt_len;
                         local_stats.packets_received += 1;
+                        if !handshake_complete {
+                            handshake_complete = true;
+                            let mut s = state.write().await;
+                            s.state = "connected".to_string();
+                            s.connected_since = Some(chrono_now());
+                            info!("WireGuard handshake completed, tunnel active");
+                        }
                     }
                     TunnResult::WriteToTunnelV6(packet, _addr) => {
                         let pkt_len = packet.len() as u64;
                         tun_writer.write_all(packet).await?;
                         local_stats.bytes_received += pkt_len;
                         local_stats.packets_received += 1;
+                        if !handshake_complete {
+                            handshake_complete = true;
+                            let mut s = state.write().await;
+                            s.state = "connected".to_string();
+                            s.connected_since = Some(chrono_now());
+                            info!("WireGuard handshake completed, tunnel active");
+                        }
                     }
                     TunnResult::Done => {}
+                    TunnResult::Err(WireGuardError::ConnectionExpired) => {
+                        warn!("WireGuard session expired during decapsulate, re-initiating handshake");
+                        match tunn.format_handshake_initiation(&mut dst_buf, true) {
+                            TunnResult::WriteToNetwork(packet) => {
+                                udp_socket.send_to(packet, endpoint).await?;
+                            }
+                            _ => {}
+                        }
+                    }
                     TunnResult::Err(e) => {
                         debug!("Client decapsulate error: {:?}", e);
                     }
@@ -955,6 +997,19 @@ async fn wg_client_loop(
                     TunnResult::WriteToNetwork(packet) => {
                         udp_socket.send_to(packet, endpoint).await?;
                     }
+                    TunnResult::Err(WireGuardError::ConnectionExpired) => {
+                        warn!("WireGuard connection expired, re-initiating handshake");
+                        match tunn.format_handshake_initiation(&mut dst_buf, true) {
+                            TunnResult::WriteToNetwork(packet) => {
+                                udp_socket.send_to(packet, endpoint).await?;
+                                debug!("Sent handshake re-initiation after expiry");
+                            }
+                            TunnResult::Err(e) => {
+                                warn!("Failed to re-initiate handshake: {:?}", e);
+                            }
+                            _ => {}
+                        }
+                    }
                     TunnResult::Err(e) => {
                         debug!("Client timer error: {:?}", e);
                     }
@@ -1028,6 +1083,19 @@ mod tests {
         assert_eq!(public.to_bytes(), derived_public.to_bytes());
     }
 
+    #[test]
+    fn test_wg_public_key_from_private() {
+        let (pub_b64, priv_b64) = generate_wg_keypair();
+        let derived = wg_public_key_from_private(&priv_b64).unwrap();
+        assert_eq!(derived, pub_b64);
+    }
+
+    #[test]
+    fn test_wg_public_key_from_private_invalid() {
+        assert!(wg_public_key_from_private("not-valid").is_err());
+        assert!(wg_public_key_from_private("AAAA").is_err());
+    }
+
     #[test]
     fn test_parse_invalid_key() {
         assert!(parse_private_key("not-valid-base64!!!").is_err());

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartvpn',
-  version: '1.15.0',
+  version: '1.16.5',
   description: 'A VPN solution with TypeScript control plane and Rust data plane daemon'
 }

ts/smartvpn.interfaces.ts

@@ -129,6 +129,14 @@ export interface IVpnServerConfig {
    *  Controls where decrypted traffic goes: allow through, block, or redirect to a target.
    *  Default: all traffic passes through (backward compatible). */
   destinationPolicy?: IDestinationPolicy;
+  /** Public endpoint address for generated client configs (e.g. 'vpn.example.com:51820').
+   *  Used as the WireGuard `Endpoint =` and SmartVPN `serverUrl` host.
+   *  Defaults to listenAddr (which is typically wrong for remote clients). */
+  serverEndpoint?: string;
+  /** AllowedIPs for generated WireGuard client configs.
+   *  Controls what traffic the client routes through the VPN tunnel.
+   *  Defaults to ['0.0.0.0/0'] (full tunnel). Set to e.g. ['10.8.0.0/24'] for split tunnel. */
+  clientAllowedIPs?: string[];
 }
 
 /**