Add chainId based dedup

refactor(proxy): cleanup basics - constants, remove dead code, fix de…

clients/clients.go

@@ -2,6 +2,8 @@ package clients
 
 import (
 	"context"
+	"crypto/rand"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"net"
@@ -34,6 +36,7 @@ type WgConfig struct {
 	IpAddress string   `json:"ipAddress"`
 	Peers     []Peer   `json:"peers"`
 	Targets   []Target `json:"targets"`
+	ChainId   string   `json:"chainId"`
 }
 
 type Target struct {
@@ -82,7 +85,8 @@ type WireGuardService struct {
 	host          string
 	serverPubKey  string
 	token         string
-	stopGetConfig func()
+	stopGetConfig        func()
+	pendingConfigChainId string
 	// Netstack fields
 	tun    tun.Device
 	tnet   *netstack2.Net
@@ -107,6 +111,13 @@ type WireGuardService struct {
 	wgTesterServer     *wgtester.Server
 }
 
+// generateChainId generates a random chain ID for deduplicating round-trip messages.
+func generateChainId() string {
+	b := make([]byte, 8)
+	_, _ = rand.Read(b)
+	return hex.EncodeToString(b)
+}
+
 func NewWireGuardService(interfaceName string, port uint16, mtu int, host string, newtId string, wsClient *websocket.Client, dns string, useNativeInterface bool) (*WireGuardService, error) {
 	key, err := wgtypes.GeneratePrivateKey()
 	if err != nil {
@@ -442,9 +453,12 @@ func (s *WireGuardService) LoadRemoteConfig() error {
 		s.stopGetConfig()
 		s.stopGetConfig = nil
 	}
+	chainId := generateChainId()
+	s.pendingConfigChainId = chainId
 	s.stopGetConfig = s.client.SendMessageInterval("newt/wg/get-config", map[string]interface{}{
 		"publicKey": s.key.PublicKey().String(),
 		"port":      s.Port,
+		"chainId":   chainId,
 	}, 2*time.Second)
 
 	logger.Debug("Requesting WireGuard configuration from remote server")
@@ -469,6 +483,17 @@ func (s *WireGuardService) handleConfig(msg websocket.WSMessage) {
 		logger.Info("Error unmarshaling target data: %v", err)
 		return
 	}
+
+	// Deduplicate using chainId: discard responses that don't match the
+	// pending request, or that we have already processed.
+	if config.ChainId != "" {
+		if config.ChainId != s.pendingConfigChainId {
+			logger.Debug("Discarding duplicate/stale newt/wg/get-config response (chainId=%s, expected=%s)", config.ChainId, s.pendingConfigChainId)
+			return
+		}
+		s.pendingConfigChainId = "" // consume – further duplicates are rejected
+	}
+
 	s.config = config
 
 	if s.stopGetConfig != nil {

common.go

@@ -287,9 +287,12 @@ func startPingCheck(tnet *netstack.Net, serverIP string, client *websocket.Clien
 							}
 							stopFunc = client.SendMessageInterval("newt/ping/request", map[string]interface{}{}, 3*time.Second)
 							// Send registration message to the server for backward compatibility
+							bcChainId := generateChainId()
+							pendingRegisterChainId = bcChainId
 							err := client.SendMessage("newt/wg/register", map[string]interface{}{
 								"publicKey":           publicKey.String(),
 								"backwardsCompatible": true,
+								"chainId":             bcChainId,
 							})
 							if err != nil {
 								logger.Error("Failed to send registration message: %v", err)

healthcheck/healthcheck.go

@@ -5,7 +5,9 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
+	"net"
 	"net/http"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -365,11 +367,12 @@ func (m *Monitor) performHealthCheck(target *Target) {
 	target.LastCheck = time.Now()
 	target.LastError = ""
 
-	// Build URL
-	url := fmt.Sprintf("%s://%s", target.Config.Scheme, target.Config.Hostname)
+	// Build URL (use net.JoinHostPort to properly handle IPv6 addresses with ports)
+	host := target.Config.Hostname
 	if target.Config.Port > 0 {
-		url = fmt.Sprintf("%s:%d", url, target.Config.Port)
+		host = net.JoinHostPort(target.Config.Hostname, strconv.Itoa(target.Config.Port))
 	}
+	url := fmt.Sprintf("%s://%s", target.Config.Scheme, host)
 	if target.Config.Path != "" {
 		if !strings.HasPrefix(target.Config.Path, "/") {
 			url += "/"

main.go

@@ -3,13 +3,16 @@ package main
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	"crypto/tls"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"flag"
 	"fmt"
 	"net"
 	"net/http"
+	"net/http/pprof"
 	"net/netip"
 	"os"
 	"os/signal"
@@ -45,6 +48,7 @@ type WgData struct {
 	TunnelIP           string               `json:"tunnelIP"`
 	Targets            TargetsByType        `json:"targets"`
 	HealthCheckTargets []healthcheck.Config `json:"healthCheckTargets"`
+	ChainId            string               `json:"chainId"`
 }
 
 type TargetsByType struct {
@@ -127,6 +131,7 @@ var (
 	publicKey                          wgtypes.Key
 	pingStopChan                       chan struct{}
 	stopFunc                           func()
+	pendingRegisterChainId             string
 	healthFile                         string
 	useNativeInterface                 bool
 	authorizedKeysFile                 string
@@ -147,6 +152,7 @@ var (
 	adminAddr         string
 	region            string
 	metricsAsyncBytes bool
+	pprofEnabled      bool
 	blueprintFile     string
 	noCloud           bool
 
@@ -159,6 +165,13 @@ var (
 	tlsPrivateKey string
 )
 
+// generateChainId generates a random chain ID for deduplicating round-trip messages.
+func generateChainId() string {
+	b := make([]byte, 8)
+	_, _ = rand.Read(b)
+	return hex.EncodeToString(b)
+}
+
 func main() {
 	// Check for subcommands first (only principals exits early)
 	if len(os.Args) > 1 {
@@ -225,6 +238,7 @@ func runNewtMain(ctx context.Context) {
 	adminAddrEnv := os.Getenv("NEWT_ADMIN_ADDR")
 	regionEnv := os.Getenv("NEWT_REGION")
 	asyncBytesEnv := os.Getenv("NEWT_METRICS_ASYNC_BYTES")
+	pprofEnabledEnv := os.Getenv("NEWT_PPROF_ENABLED")
 
 	disableClientsEnv := os.Getenv("DISABLE_CLIENTS")
 	disableClients = disableClientsEnv == "true"
@@ -390,6 +404,14 @@ func runNewtMain(ctx context.Context) {
 			metricsAsyncBytes = v
 		}
 	}
+	// pprof debug endpoint toggle
+	if pprofEnabledEnv == "" {
+		flag.BoolVar(&pprofEnabled, "pprof", false, "Enable pprof debug endpoints on admin server")
+	} else {
+		if v, err := strconv.ParseBool(pprofEnabledEnv); err == nil {
+			pprofEnabled = v
+		}
+	}
 	// Optional region flag (resource attribute)
 	if regionEnv == "" {
 		flag.StringVar(&region, "region", "", "Optional region resource attribute (also NEWT_REGION)")
@@ -485,6 +507,14 @@ func runNewtMain(ctx context.Context) {
 		if tel.PrometheusHandler != nil {
 			mux.Handle("/metrics", tel.PrometheusHandler)
 		}
+		if pprofEnabled {
+			mux.HandleFunc("/debug/pprof/", pprof.Index)
+			mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
+			mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+			mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+			mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+			logger.Info("pprof debugging enabled on %s/debug/pprof/", tcfg.AdminAddr)
+		}
 		admin := &http.Server{
 			Addr:              tcfg.AdminAddr,
 			Handler:           otelhttp.NewHandler(mux, "newt-admin"),
@@ -687,6 +717,24 @@ func runNewtMain(ctx context.Context) {
 		defer func() {
 			telemetry.IncSiteRegistration(ctx, regResult)
 		}()
+
+		// Deduplicate using chainId: if the server echoes back a chainId we have
+		// already consumed (or one that doesn't match our current pending request),
+		// throw the message away to avoid setting up the tunnel twice.
+		var chainData struct {
+			ChainId string `json:"chainId"`
+		}
+		if jsonBytes, err := json.Marshal(msg.Data); err == nil {
+			_ = json.Unmarshal(jsonBytes, &chainData)
+		}
+		if chainData.ChainId != "" {
+			if chainData.ChainId != pendingRegisterChainId {
+				logger.Debug("Discarding duplicate/stale newt/wg/connect (chainId=%s, expected=%s)", chainData.ChainId, pendingRegisterChainId)
+				return
+			}
+			pendingRegisterChainId = "" // consume – further duplicates with this id are rejected
+		}
+
 		if stopFunc != nil {
 			stopFunc()     // stop the ws from sending more requests
 			stopFunc = nil // reset stopFunc to nil to avoid double stopping
@@ -952,10 +1000,13 @@ persistent_keepalive_interval=5`, util.FixKey(privateKey.String()), util.FixKey(
 				},
 			}
 
+			chainId := generateChainId()
+			pendingRegisterChainId = chainId
 			stopFunc = client.SendMessageInterval(topicWGRegister, map[string]interface{}{
 				"publicKey":   publicKey.String(),
 				"pingResults": pingResults,
 				"newtVersion": newtVersion,
+				"chainId":     chainId,
 			}, 2*time.Second)
 
 			return
@@ -1055,10 +1106,13 @@ persistent_keepalive_interval=5`, util.FixKey(privateKey.String()), util.FixKey(
 		}
 
 		// Send the ping results to the cloud for selection
+		chainId := generateChainId()
+		pendingRegisterChainId = chainId
 		stopFunc = client.SendMessageInterval(topicWGRegister, map[string]interface{}{
 			"publicKey":   publicKey.String(),
 			"pingResults": pingResults,
 			"newtVersion": newtVersion,
+			"chainId":     chainId,
 		}, 2*time.Second)
 
 		logger.Debug("Sent exit node ping results to cloud for selection: pingResults=%+v", pingResults)
@@ -1721,10 +1775,13 @@ persistent_keepalive_interval=5`, util.FixKey(privateKey.String()), util.FixKey(
 		}
 
 		// Send registration message to the server for backward compatibility
+		bcChainId := generateChainId()
+		pendingRegisterChainId = bcChainId
 		err := client.SendMessage(topicWGRegister, map[string]interface{}{
 			"publicKey":           publicKey.String(),
 			"newtVersion":         newtVersion,
 			"backwardsCompatible": true,
+			"chainId":             bcChainId,
 		})
 
 		sendBlueprint(client)

proxy/manager.go

@@ -21,7 +21,10 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 )
 
-const errUnsupportedProtoFmt = "unsupported protocol: %s"
+const (
+	errUnsupportedProtoFmt = "unsupported protocol: %s"
+	maxUDPPacketSize       = 65507
+)
 
 // Target represents a proxy target with its address and port
 type Target struct {
@@ -105,13 +108,9 @@ func classifyProxyError(err error) string {
 	if errors.Is(err, net.ErrClosed) {
 		return "closed"
 	}
-	if ne, ok := err.(net.Error); ok {
-		if ne.Timeout() {
-			return "timeout"
-		}
-		if ne.Temporary() {
-			return "temporary"
-		}
+	var ne net.Error
+	if errors.As(err, &ne) && ne.Timeout() {
+		return "timeout"
 	}
 	msg := strings.ToLower(err.Error())
 	switch {
@@ -437,14 +436,6 @@ func (pm *ProxyManager) Stop() error {
 		pm.udpConns = append(pm.udpConns[:i], pm.udpConns[i+1:]...)
 	}
 
-	// // Clear the target maps
-	// for k := range pm.tcpTargets {
-	// 	delete(pm.tcpTargets, k)
-	// }
-	// for k := range pm.udpTargets {
-	// 	delete(pm.udpTargets, k)
-	// }
-
 	// Give active connections a chance to close gracefully
 	time.Sleep(100 * time.Millisecond)
 
@@ -498,7 +489,7 @@ func (pm *ProxyManager) handleTCPProxy(listener net.Listener, targetAddr string)
 			if !pm.running {
 				return
 			}
-			if ne, ok := err.(net.Error); ok && !ne.Temporary() {
+			if errors.Is(err, net.ErrClosed) {
 				logger.Info("TCP listener closed, stopping proxy handler for %v", listener.Addr())
 				return
 			}
@@ -564,7 +555,7 @@ func (pm *ProxyManager) handleTCPProxy(listener net.Listener, targetAddr string)
 }
 
 func (pm *ProxyManager) handleUDPProxy(conn *gonet.UDPConn, targetAddr string) {
-	buffer := make([]byte, 65507) // Max UDP packet size
+	buffer := make([]byte, maxUDPPacketSize) // Max UDP packet size
 	clientConns := make(map[string]*net.UDPConn)
 	var clientsMutex sync.RWMutex
 
@@ -583,7 +574,7 @@ func (pm *ProxyManager) handleUDPProxy(conn *gonet.UDPConn, targetAddr string) {
 			}
 
 			// Check for connection closed conditions
-			if err == io.EOF || strings.Contains(err.Error(), "use of closed network connection") {
+			if errors.Is(err, io.EOF) || errors.Is(err, net.ErrClosed) {
 				logger.Info("UDP connection closed, stopping proxy handler")
 
 				// Clean up existing client connections
@@ -662,10 +653,14 @@ func (pm *ProxyManager) handleUDPProxy(conn *gonet.UDPConn, targetAddr string) {
 					telemetry.IncProxyConnectionEvent(context.Background(), tunnelID, "udp", telemetry.ProxyConnectionClosed)
 				}()
 
-				buffer := make([]byte, 65507)
+				buffer := make([]byte, maxUDPPacketSize)
 				for {
 					n, _, err := targetConn.ReadFromUDP(buffer)
 					if err != nil {
+						// Connection closed is normal during cleanup
+						if errors.Is(err, net.ErrClosed) || errors.Is(err, io.EOF) {
+							return // defer will handle cleanup, result stays "success"
+						}
 						logger.Error("Error reading from target: %v", err)
 						result = "failure"
 						return // defer will handle cleanup