v1.17.0

changelog.md

@@ -1,5 +1,20 @@
 # Changelog
 
+## 2026-03-31 - 1.17.0 - feat(wireguard)
+track per-transport server statistics and make WireGuard clients active only after handshake
+
+- add websocket, quic, and wireguard active-client and total-connection counters to server statistics
+- register WireGuard peers without marking them active until handshake/data is received, and remove them from active clients on expiration or idle timeout
+- sync WireGuard byte counters into aggregate server stats independently of active client presence and expose new statistics fields in TypeScript interfaces
+
+## 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
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartvpn",
-  "version": "1.16.4",
+  "version": "1.17.0",
   "private": false,
   "description": "A VPN solution with TypeScript control plane and Rust data plane daemon",
   "type": "module",

rust/src/server.rs

@@ -132,6 +132,14 @@ pub struct ServerStatistics {
     pub uptime_seconds: u64,
     pub active_clients: u64,
     pub total_connections: u64,
+    /// Per-transport active client counts.
+    pub active_clients_websocket: u64,
+    pub active_clients_quic: u64,
+    pub active_clients_wireguard: u64,
+    /// Per-transport total connection counts.
+    pub total_connections_websocket: u64,
+    pub total_connections_quic: u64,
+    pub total_connections_wireguard: u64,
 }
 
 /// The forwarding engine determines how decrypted IP packets are routed.
@@ -450,7 +458,21 @@ impl VpnServer {
         if let Some(ref state) = self.state {
             let mut stats = state.stats.read().await.clone();
             stats.uptime_seconds = state.started_at.elapsed().as_secs();
-            stats.active_clients = state.clients.read().await.len() as u64;
+            let clients = state.clients.read().await;
+            stats.active_clients = clients.len() as u64;
+            // Compute per-transport active counts
+            stats.active_clients_websocket = 0;
+            stats.active_clients_quic = 0;
+            stats.active_clients_wireguard = 0;
+            for info in clients.values() {
+                match info.transport_type.as_str() {
+                    "websocket" => stats.active_clients_websocket += 1,
+                    "quic" => stats.active_clients_quic += 1,
+                    "wireguard" => stats.active_clients_wireguard += 1,
+                    _ => {}
+                }
+            }
+            drop(clients);
             stats
         } else {
             ServerStatistics::default()
@@ -1303,6 +1325,11 @@ async fn handle_client_connection(
     {
         let mut stats = state.stats.write().await;
         stats.total_connections += 1;
+        match transport_type {
+            "websocket" => stats.total_connections_websocket += 1,
+            "quic" => stats.total_connections_quic += 1,
+            _ => {}
+        }
     }
 
     // Send assigned IP info (encrypted), include effective MTU

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
 // ============================================================================
@@ -121,7 +125,8 @@ 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)
@@ -132,6 +137,8 @@ struct TcpSession {
     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 {
@@ -385,17 +392,15 @@ 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);
 
@@ -470,9 +475,8 @@ impl NatEngine {
                 let socket = self.sockets.get_mut::<tcp::Socket>(session.smoltcp_handle);
                 if socket.is_active() {
                     session.bridge_started = true;
-                    // Recreate the data channel — the old receiver was dropped
                     let (data_tx, data_rx) = mpsc::channel::<Vec<u8>>(256);
-                    session.bridge_data_tx = data_tx;
+                    session.bridge_data_tx = Some(data_tx);
                     let btx = bridge_tx_clone.clone();
                     let k = key.clone();
                     let addr = session.connect_addr;
@@ -503,15 +507,29 @@ impl NatEngine {
 
         // Bridge: read data from smoltcp TCP sockets → send to bridge tasks
         let mut closed_tcp: Vec<SessionKey> = Vec::new();
-        let mut tcp_outbound: Vec<(mpsc::Sender<Vec<u8>>, Vec<u8>)> = 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 session.bridge_started && socket.can_recv() {
-                let sender = session.bridge_data_tx.clone();
-                let _ = socket.recv(|data| {
-                    tcp_outbound.push((sender.clone(), data.to_vec()));
-                    (data.len(), ())
-                });
+                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() {
@@ -519,10 +537,11 @@ impl NatEngine {
             }
         }
 
-        // Send TCP data to bridge tasks (outside borrow of self.tcp_sessions)
-        for (sender, data) in tcp_outbound {
-            if sender.try_send(data).is_err() {
-                debug!("NAT: bridge channel full, TCP data dropped");
+        // 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;
             }
         }
 
@@ -561,39 +580,31 @@ impl NatEngine {
         match msg {
             BridgeMessage::TcpData { key, data } => {
                 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() {
-                        // Try to write directly first
-                        let all_data = if session.pending_send.is_empty() {
-                            &data
-                        } else {
-                            session.pending_send.extend_from_slice(&data);
-                            &session.pending_send.clone()
-                        };
-                        match socket.send_slice(all_data) {
-                            Ok(written) if written < all_data.len() => {
-                                // Partial write — buffer the rest
-                                if session.pending_send.is_empty() {
-                                    session.pending_send = data[written..].to_vec();
-                                } else {
-                                    session.pending_send.drain(..written);
-                                }
-                            }
-                            Ok(_) => {
-                                // Full write — clear any pending data
-                                session.pending_send.clear();
-                            }
-                            Err(_) => {
-                                // Write failed — buffer everything
-                                if session.pending_send.is_empty() {
-                                    session.pending_send = 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);
                             }
+                            _ => {}
                         }
-                    } else {
-                        // Can't send yet — buffer for later
-                        session.pending_send.extend_from_slice(&data);
+                    }
+                    // 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;
                     }
                 }
             }
@@ -644,6 +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,
@@ -651,9 +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() => {
@@ -664,18 +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

@@ -220,6 +220,15 @@ struct PeerState {
     #[allow(dead_code)]
     persistent_keepalive: Option<u16>,
     stats: WgPeerStats,
+    /// Whether this peer has completed a WireGuard handshake and is in state.clients.
+    is_connected: bool,
+    /// Last time we received data or handshake activity from this peer.
+    last_activity_at: Option<tokio::time::Instant>,
+    /// VPN IP assigned during registration (used for connect/disconnect).
+    vpn_ip: Option<Ipv4Addr>,
+    /// Previous synced byte counts for aggregate stats delta tracking.
+    prev_synced_bytes_sent: u64,
+    prev_synced_bytes_received: u64,
 }
 
 impl PeerState {
@@ -276,6 +285,11 @@ fn add_peer_to_loop(
         endpoint,
         persistent_keepalive: config.persistent_keepalive,
         stats: WgPeerStats::default(),
+        is_connected: false,
+        last_activity_at: None,
+        vpn_ip: None,
+        prev_synced_bytes_sent: 0,
+        prev_synced_bytes_received: 0,
     });
 
     info!("Added WireGuard peer: {}", config.public_key);
@@ -323,8 +337,9 @@ fn wg_timestamp_now() -> String {
     format!("{}", duration.as_secs())
 }
 
-/// Register a WG peer in ServerState (tun_routes, clients, ip_pool).
-/// Returns the VPN IP and the per-peer return-packet receiver.
+/// Register a WG peer in ServerState (tun_routes + ip_pool only).
+/// Does NOT add to state.clients — peers appear there only after handshake.
+/// Returns the VPN IP.
 async fn register_wg_peer(
     state: &Arc<ServerState>,
     peer: &PeerState,
@@ -366,13 +381,23 @@ async fn register_wg_peer(
         });
     }
 
-    // Insert ClientInfo
+    info!("WG peer {} registered with IP {} (not yet connected)", peer.public_key_b64, vpn_ip);
+    Ok(Some(vpn_ip))
+}
+
+/// Add a WG peer to state.clients on first successful handshake (data received).
+async fn connect_wg_peer(
+    state: &Arc<ServerState>,
+    peer: &PeerState,
+    vpn_ip: Ipv4Addr,
+) {
+    let client_id = format!("wg-{}", &peer.public_key_b64[..8.min(peer.public_key_b64.len())]);
     let client_info = ClientInfo {
         client_id: client_id.clone(),
         assigned_ip: vpn_ip.to_string(),
         connected_since: wg_timestamp_now(),
-        bytes_sent: 0,
-        bytes_received: 0,
+        bytes_sent: peer.stats.bytes_sent,
+        bytes_received: peer.stats.bytes_received,
         packets_dropped: 0,
         bytes_dropped: 0,
         last_keepalive_at: None,
@@ -380,13 +405,31 @@ async fn register_wg_peer(
         rate_limit_bytes_per_sec: None,
         burst_bytes: None,
         authenticated_key: peer.public_key_b64.clone(),
-        registered_client_id: client_id,
+        registered_client_id: client_id.clone(),
         remote_addr: peer.endpoint.map(|e| e.to_string()),
         transport_type: "wireguard".to_string(),
     };
     state.clients.write().await.insert(client_info.client_id.clone(), client_info);
 
-    Ok(Some(vpn_ip))
+    // Increment total_connections
+    {
+        let mut stats = state.stats.write().await;
+        stats.total_connections += 1;
+        stats.total_connections_wireguard += 1;
+    }
+
+    info!("WG peer {} connected (IP: {})", peer.public_key_b64, vpn_ip);
+}
+
+/// Remove a WG peer from state.clients (disconnect without unregistering).
+async fn disconnect_wg_peer(
+    state: &Arc<ServerState>,
+    pubkey: &str,
+) {
+    let client_id = format!("wg-{}", &pubkey[..8.min(pubkey.len())]);
+    if state.clients.write().await.remove(&client_id).is_some() {
+        info!("WG peer {} disconnected (removed from active clients)", pubkey);
+    }
 }
 
 /// Unregister a WG peer from ServerState.
@@ -460,6 +503,11 @@ pub async fn run_wg_listener(
             endpoint,
             persistent_keepalive: peer_config.persistent_keepalive,
             stats: WgPeerStats::default(),
+            is_connected: false,
+            last_activity_at: None,
+            vpn_ip: None,
+            prev_synced_bytes_sent: 0,
+            prev_synced_bytes_received: 0,
         });
     }
 
@@ -470,11 +518,12 @@ pub async fn run_wg_listener(
     // Merged return-packet channel: all per-peer channels feed into this
     let (wg_return_tx, mut wg_return_rx) = mpsc::channel::<(String, Vec<u8>)>(1024);
 
-    // Register initial peers in ServerState and track their VPN IPs
+    // Register initial peers in ServerState (IP reservation + tun_routes only, NOT state.clients)
     let mut peer_vpn_ips: HashMap<String, Ipv4Addr> = HashMap::new();
-    for peer in &peers {
+    for peer in peers.iter_mut() {
         if let Ok(Some(ip)) = register_wg_peer(&state, peer, &wg_return_tx).await {
             peer_vpn_ips.insert(peer.public_key_b64.clone(), ip);
+            peer.vpn_ip = Some(ip);
         }
     }
 
@@ -483,6 +532,7 @@ pub async fn run_wg_listener(
     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 idle_check_timer = tokio::time::interval(std::time::Duration::from_secs(10));
 
     loop {
         tokio::select! {
@@ -506,6 +556,8 @@ pub async fn run_wg_listener(
                                 }
                             }
                             peer.endpoint = Some(src_addr);
+                            // Handshake response counts as activity
+                            peer.last_activity_at = Some(tokio::time::Instant::now());
                             handled = true;
                             break;
                         }
@@ -530,6 +582,15 @@ pub async fn run_wg_listener(
                                 peer.stats.packets_received += 1;
                             }
                             peer.endpoint = Some(src_addr);
+                            // Track activity and detect handshake completion
+                            peer.last_activity_at = Some(tokio::time::Instant::now());
+                            if !peer.is_connected {
+                                peer.is_connected = true;
+                                peer.stats.last_handshake_time = Some(wg_timestamp_now());
+                                if let Some(vpn_ip) = peer.vpn_ip {
+                                    connect_wg_peer(&state, peer, vpn_ip).await;
+                                }
+                            }
                             handled = true;
                             break;
                         }
@@ -553,6 +614,15 @@ pub async fn run_wg_listener(
                                 peer.stats.packets_received += 1;
                             }
                             peer.endpoint = Some(src_addr);
+                            // Track activity and detect handshake completion
+                            peer.last_activity_at = Some(tokio::time::Instant::now());
+                            if !peer.is_connected {
+                                peer.is_connected = true;
+                                peer.stats.last_handshake_time = Some(wg_timestamp_now());
+                                if let Some(vpn_ip) = peer.vpn_ip {
+                                    connect_wg_peer(&state, peer, vpn_ip).await;
+                                }
+                            }
                             handled = true;
                             break;
                         }
@@ -603,6 +673,10 @@ pub async fn run_wg_listener(
                         }
                         TunnResult::Err(WireGuardError::ConnectionExpired) => {
                             warn!("WG peer {} connection expired", peer.public_key_b64);
+                            if peer.is_connected {
+                                peer.is_connected = false;
+                                disconnect_wg_peer(&state, &peer.public_key_b64).await;
+                            }
                         }
                         TunnResult::Err(e) => {
                             debug!("Timer error for WG peer {}: {:?}",
@@ -617,19 +691,39 @@ pub async fn run_wg_listener(
             _ = stats_timer.tick() => {
                 let mut clients = state.clients.write().await;
                 let mut stats = state.stats.write().await;
-                for peer in peers.iter() {
+                for peer in peers.iter_mut() {
+                    // Always update aggregate stats (regardless of connection state)
+                    let delta_sent = peer.stats.bytes_sent.saturating_sub(peer.prev_synced_bytes_sent);
+                    let delta_recv = peer.stats.bytes_received.saturating_sub(peer.prev_synced_bytes_received);
+                    if delta_sent > 0 || delta_recv > 0 {
+                        stats.bytes_sent += delta_sent;
+                        stats.bytes_received += delta_recv;
+                        peer.prev_synced_bytes_sent = peer.stats.bytes_sent;
+                        peer.prev_synced_bytes_received = peer.stats.bytes_received;
+                    }
+
+                    // Only update ClientInfo if peer is connected (in state.clients)
                     let client_id = format!("wg-{}", &peer.public_key_b64[..8.min(peer.public_key_b64.len())]);
                     if let Some(info) = clients.get_mut(&client_id) {
-                        // Update stats delta
-                        let prev_sent = info.bytes_sent;
-                        let prev_recv = info.bytes_received;
                         info.bytes_sent = peer.stats.bytes_sent;
                         info.bytes_received = peer.stats.bytes_received;
                         info.remote_addr = peer.endpoint.map(|e| e.to_string());
+                    }
+                }
+            }
 
-                        // Update aggregate stats
-                        stats.bytes_sent += peer.stats.bytes_sent.saturating_sub(prev_sent);
-                        stats.bytes_received += peer.stats.bytes_received.saturating_sub(prev_recv);
+            // --- Idle timeout check (every 10s) ---
+            _ = idle_check_timer.tick() => {
+                let now = tokio::time::Instant::now();
+                for peer in peers.iter_mut() {
+                    if peer.is_connected {
+                        if let Some(last) = peer.last_activity_at {
+                            if now.duration_since(last) > std::time::Duration::from_secs(180) {
+                                info!("WG peer {} idle timeout (180s), disconnecting", peer.public_key_b64);
+                                peer.is_connected = false;
+                                disconnect_wg_peer(&state, &peer.public_key_b64).await;
+                            }
+                        }
                     }
                 }
             }
@@ -646,11 +740,12 @@ pub async fn run_wg_listener(
                             &config.private_key,
                         );
                         if result.is_ok() {
-                            // Register new peer in ServerState
-                            let peer = peers.last().unwrap();
+                            // Register new peer in ServerState (IP + tun_routes only)
+                            let peer = peers.last_mut().unwrap();
                             match register_wg_peer(&state, peer, &wg_return_tx).await {
                                 Ok(Some(ip)) => {
                                     peer_vpn_ips.insert(peer_config.public_key.clone(), ip);
+                                    peer.vpn_ip = Some(ip);
                                 }
                                 Ok(None) => {}
                                 Err(e) => {
@@ -1239,7 +1334,7 @@ mod tests {
                 let _ = server_tunn.decapsulate(None, &pkt_copy, &mut buf_b);
             }
             TunnResult::Done => {}
-            other => {
+            _other => {
                 // Drain
                 loop {
                     match client_tunn.decapsulate(None, &[], &mut buf_a) {

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartvpn',
-  version: '1.16.4',
+  version: '1.17.0',
   description: 'A VPN solution with TypeScript control plane and Rust data plane daemon'
 }

ts/smartvpn.interfaces.ts

@@ -217,6 +217,14 @@ export interface IVpnClientInfo {
 export interface IVpnServerStatistics extends IVpnStatistics {
   activeClients: number;
   totalConnections: number;
+  /** Per-transport active client counts. */
+  activeClientsWebsocket: number;
+  activeClientsQuic: number;
+  activeClientsWireguard: number;
+  /** Per-transport total connection counts. */
+  totalConnectionsWebsocket: number;
+  totalConnectionsQuic: number;
+  totalConnectionsWireguard: number;
 }
 
 export interface IVpnKeypair {