Merge pull request #6 from fosrl/dev

Proxy Manager Rewrite

.gitignore

@@ -1 +1,3 @@
 newt
+.DS_Store
+bin/

Makefile

@@ -11,7 +11,16 @@ test:
 	docker run fosrl/newt:latest
 
 local: 
-	 CGO_ENABLED=0 go build -o newt
+	CGO_ENABLED=0 go build -o newt
+
+release:
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o bin/newt_linux_arm64
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o bin/newt_linux_amd64
+	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -o bin/newt_darwin_arm64
+	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -o bin/newt_darwin_amd64
+	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -o newt_windows_amd64.bin/exe
+	CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build -o bin/newt_freebsd_amd64
+	CGO_ENABLED=0 GOOS=freebsd GOARCH=arm64 go build -o bin/newt_freebsd_arm64
 
 clean:
 	rm newt

README.md

@@ -19,7 +19,7 @@ _Sample output of a Newt container connected to Pangolin and hosting various res
 
 ### Registers with Pangolin
 
-Using the Newt ID and a secret the client will make HTTP requests to Pangolin to receive a session token. Using that token it will connect to a websocket and maintain that connection. Control messages will be sent over the websocket.
+Using the Newt ID and a secret, the client will make HTTP requests to Pangolin to receive a session token. Using that token, it will connect to a websocket and maintain that connection. Control messages will be sent over the websocket.
 
 ### Receives WireGuard Control Messages
 
@@ -27,7 +27,7 @@ When Newt receives WireGuard control messages, it will use the information encod
 
 ### Receives Proxy Control Messages
 
-When Newt receives WireGuard control messages, it will use the information encoded to crate local low level TCP and UDP proxies attached to the virtual tunnel in order to relay traffic to programmed targets.
+When Newt receives WireGuard control messages, it will use the information encoded to create a local low level TCP and UDP proxies attached to the virtual tunnel in order to relay traffic to programmed targets.
 
 ## CLI Args
 

SECURITY.md

@@ -0,0 +1,14 @@
+# Security Policy
+
+If you discover a security vulnerability, please follow the steps below to responsibly disclose it to us:
+
+1. **Do not create a public GitHub issue or discussion post.** This could put the security of other users at risk.
+2. Send a detailed report to [security@fossorial.io](mailto:security@fossorial.io) or send a **private** message to a maintainer on [Discord](https://discord.gg/HCJR8Xhme4). Include:
+
+- Description and location of the vulnerability.
+- Potential impact of the vulnerability.
+- Steps to reproduce the vulnerability.
+- Potential solutions to fix the vulnerability.
+- Your name/handle and a link for recognition (optional).
+
+We aim to address the issue as soon as possible.

docker-compose.yml

@@ -7,3 +7,4 @@ services:
       - PANGOLIN_ENDPOINT=https://example.com
       - NEWT_ID=2ix2t8xk22ubpfy 
       - NEWT_SECRET=nnisrfsdfc7prqsp9ewo1dvtvci50j5uiqotez00dgap0ii2 
+      - LOG_LEVEL=DEBUG

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/google/btree v1.1.2 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
 	golang.org/x/crypto v0.28.0 // indirect
+	golang.org/x/exp v0.0.0-20250106191152-7588d65b2ba8 // indirect
 	golang.org/x/net v0.30.0 // indirect
 	golang.org/x/sys v0.26.0 // indirect
 	golang.org/x/time v0.7.0 // indirect

go.sum

@@ -4,6 +4,8 @@ github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aN
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 golang.org/x/crypto v0.28.0 h1:GBDwsMXVQi34v5CCYUm2jkJvu4cbtru2U4TN2PSyQnw=
 golang.org/x/crypto v0.28.0/go.mod h1:rmgy+3RHxRZMyY0jjAJShp2zgEdOqj2AO7U0pYmeQ7U=
+golang.org/x/exp v0.0.0-20250106191152-7588d65b2ba8 h1:yqrTHse8TCMW1M1ZCP+VAR/l0kKxwaAIqN/il7x4voA=
+golang.org/x/exp v0.0.0-20250106191152-7588d65b2ba8/go.mod h1:tujkw807nyEEAamNbDrEGzRav+ilXA7PCRAd6xsmwiU=
 golang.org/x/net v0.30.0 h1:AcW1SDZMkb8IpzCdQUaIq2sP4sZ4zw+55h6ynffypl4=
 golang.org/x/net v0.30.0/go.mod h1:2wGyMJ5iFasEhkwi13ChkO/t1ECNC4X4eBKkVFyYFlU=
 golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=

main.go

@@ -12,6 +12,7 @@ import (
 	"net/netip"
 	"os"
 	"os/signal"
+	"strconv"
 	"strings"
 	"syscall"
 	"time"
@@ -123,6 +124,7 @@ func startPingCheck(tnet *netstack.Net, serverIP string, stopChan chan struct{})
 				err := ping(tnet, serverIP)
 				if err != nil {
 					logger.Warn("Periodic ping failed: %v", err)
+					logger.Warn("HINT: Do you have UDP port 51280 (or the port in config.yml) open on your Pangolin server?")
 				}
 			case <-stopChan:
 				logger.Info("Stopping ping check")
@@ -247,6 +249,8 @@ func main() {
 		endpoint   string
 		id         string
 		secret     string
+		mtu        string
+		mtuInt     int
 		dns        string
 		privateKey wgtypes.Key
 		err        error
@@ -257,6 +261,7 @@ func main() {
 	endpoint = os.Getenv("PANGOLIN_ENDPOINT")
 	id = os.Getenv("NEWT_ID")
 	secret = os.Getenv("NEWT_SECRET")
+	mtu = os.Getenv("MTU")
 	dns = os.Getenv("DNS")
 	logLevel = os.Getenv("LOG_LEVEL")
 
@@ -269,6 +274,9 @@ func main() {
 	if secret == "" {
 		flag.StringVar(&secret, "secret", "", "Newt secret")
 	}
+	if mtu == "" {
+		flag.StringVar(&mtu, "mtu", "1280", "MTU to use")
+	}
 	if dns == "" {
 		flag.StringVar(&dns, "dns", "8.8.8.8", "DNS server to use")
 	}
@@ -286,6 +294,12 @@ func main() {
 		logger.Fatal("endpoint, id, and secret are required either via CLI flags or environment variables")
 	}
 
+	// parse the mtu string into an int
+	mtuInt, err = strconv.Atoi(mtu)
+	if err != nil {
+		logger.Fatal("Failed to parse MTU: %v", err)
+	}
+
 	privateKey, err = wgtypes.GeneratePrivateKey()
 	if err != nil {
 		logger.Fatal("Failed to generate private key: %v", err)
@@ -333,7 +347,8 @@ func main() {
 			err = pingWithRetry(tnet, wgData.ServerIP)
 			if err != nil {
 				// Handle complete failure after all retries
-				logger.Error("Failed to ping %s: %v", wgData.ServerIP, err)
+				logger.Warn("Failed to ping %s: %v", wgData.ServerIP, err)
+				logger.Warn("HINT: Do you have UDP port 51280 (or the port in config.yml) open on your Pangolin server?")
 			}
 			return
 		}
@@ -353,7 +368,7 @@ func main() {
 		tun, tnet, err = netstack.CreateNetTUN(
 			[]netip.Addr{netip.MustParseAddr(wgData.TunnelIP)},
 			[]netip.Addr{netip.MustParseAddr(dns)},
-			1420)
+			mtuInt)
 		if err != nil {
 			logger.Error("Failed to create TUN device: %v", err)
 		}
@@ -440,11 +455,6 @@ persistent_keepalive_interval=5`, fixKey(fmt.Sprintf("%s", privateKey)), fixKey(
 		if len(targetData.Targets) > 0 {
 			updateTargets(pm, "add", wgData.TunnelIP, "tcp", targetData)
 		}
-
-		err = pm.Start()
-		if err != nil {
-			logger.Error("Failed to start proxy manager: %v", err)
-		}
 	})
 
 	client.RegisterHandler("newt/udp/add", func(msg websocket.WSMessage) {
@@ -465,11 +475,6 @@ persistent_keepalive_interval=5`, fixKey(fmt.Sprintf("%s", privateKey)), fixKey(
 		if len(targetData.Targets) > 0 {
 			updateTargets(pm, "add", wgData.TunnelIP, "udp", targetData)
 		}
-
-		err = pm.Start()
-		if err != nil {
-			logger.Error("Failed to start proxy manager: %v", err)
-		}
 	})
 
 	client.RegisterHandler("newt/udp/remove", func(msg websocket.WSMessage) {

proxy/manager.go

@@ -4,331 +4,332 @@ import (
 	"fmt"
 	"io"
 	"net"
-	"strings"
 	"sync"
 	"time"
 
 	"github.com/fosrl/newt/logger"
-
 	"golang.zx2c4.com/wireguard/tun/netstack"
+	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 )
 
+// Target represents a proxy target with its address and port
+type Target struct {
+	Address string
+	Port    int
+}
+
+// ProxyManager handles the creation and management of proxy connections
+type ProxyManager struct {
+	tnet       *netstack.Net
+	tcpTargets map[string]map[int]string // map[listenIP]map[port]targetAddress
+	udpTargets map[string]map[int]string
+	listeners  []*gonet.TCPListener
+	udpConns   []*gonet.UDPConn
+	running    bool
+	mutex      sync.RWMutex
+}
+
+// NewProxyManager creates a new proxy manager instance
 func NewProxyManager(tnet *netstack.Net) *ProxyManager {
 	return &ProxyManager{
-		tnet: tnet,
+		tnet:       tnet,
+		tcpTargets: make(map[string]map[int]string),
+		udpTargets: make(map[string]map[int]string),
+		listeners:  make([]*gonet.TCPListener, 0),
+		udpConns:   make([]*gonet.UDPConn, 0),
 	}
 }
 
-func (pm *ProxyManager) AddTarget(protocol, listen string, port int, target string) {
+// AddTarget adds a new target for proxying
-	pm.Lock()
+func (pm *ProxyManager) AddTarget(proto, listenIP string, port int, targetAddr string) error {
-	defer pm.Unlock()
+	pm.mutex.Lock()
+	defer pm.mutex.Unlock()
 
-	logger.Info("Adding target: %s://%s:%d -> %s", protocol, listen, port, target)
+	switch proto {
-
+	case "tcp":
-	newTarget := ProxyTarget{
+		if pm.tcpTargets[listenIP] == nil {
-		Protocol: protocol,
+			pm.tcpTargets[listenIP] = make(map[int]string)
-		Listen:   listen,
+		}
-		Port:     port,
+		pm.tcpTargets[listenIP][port] = targetAddr
-		Target:   target,
+	case "udp":
-		cancel:   make(chan struct{}),
+		if pm.udpTargets[listenIP] == nil {
-		done:     make(chan struct{}),
+			pm.udpTargets[listenIP] = make(map[int]string)
+		}
+		pm.udpTargets[listenIP][port] = targetAddr
+	default:
+		return fmt.Errorf("unsupported protocol: %s", proto)
 	}
 
-	pm.targets = append(pm.targets, newTarget)
+	if pm.running {
+		return pm.startTarget(proto, listenIP, port, targetAddr)
+	} else {
+		logger.Info("Not adding target because not running")
+	}
+	return nil
 }
 
-func (pm *ProxyManager) RemoveTarget(protocol, listen string, port int) error {
+func (pm *ProxyManager) RemoveTarget(proto, listenIP string, port int) error {
-	pm.Lock()
+	pm.mutex.Lock()
-	defer pm.Unlock()
+	defer pm.mutex.Unlock()
 
-	protocol = strings.ToLower(protocol)
+	switch proto {
-	if protocol != "tcp" && protocol != "udp" {
+	case "tcp":
-		return fmt.Errorf("unsupported protocol: %s", protocol)
+		if targets, ok := pm.tcpTargets[listenIP]; ok {
-	}
+			delete(targets, port)
-
+			// Remove and close the corresponding TCP listener
-	for i, target := range pm.targets {
+			for i, listener := range pm.listeners {
-		if target.Listen == listen &&
+				if addr, ok := listener.Addr().(*net.TCPAddr); ok && addr.Port == port {
-			target.Port == port &&
+					listener.Close()
-			strings.ToLower(target.Protocol) == protocol {
+					time.Sleep(50 * time.Millisecond)
-
+					// Remove from slice
-			// Signal the serving goroutine to stop
+					pm.listeners = append(pm.listeners[:i], pm.listeners[i+1:]...)
-			select {
+					break
-			case <-target.cancel:
-				// Channel is already closed, no need to close it again
-			default:
-				close(target.cancel)
-			}
-
-			// Close the appropriate listener/connection based on protocol
-			target.Lock()
-			switch protocol {
-			case "tcp":
-				if target.listener != nil {
-					select {
-					case <-target.cancel:
-						// Listener was already closed by Stop()
-					default:
-						target.listener.Close()
-					}
-				}
-			case "udp":
-				if target.udpConn != nil {
-					select {
-					case <-target.cancel:
-						// Connection was already closed by Stop()
-					default:
-						target.udpConn.Close()
-					}
 				}
 			}
-			target.Unlock()
-
-			// Wait for the target to fully stop
-			<-target.done
-
-			// Remove the target from the slice
-			pm.targets = append(pm.targets[:i], pm.targets[i+1:]...)
-			return nil
-		}
-	}
-
-	return fmt.Errorf("target not found for %s %s:%d", protocol, listen, port)
-}
-
-func (pm *ProxyManager) Start() error {
-	pm.RLock()
-	defer pm.RUnlock()
-
-	for i := range pm.targets {
-		target := &pm.targets[i]
-
-		target.Lock()
-		// If target is already running, skip it
-		if target.listener != nil || target.udpConn != nil {
-			target.Unlock()
-			continue
-		}
-
-		// Mark the target as starting by creating a nil listener/connection
-		// This prevents other goroutines from trying to start it
-		if strings.ToLower(target.Protocol) == "tcp" {
-			target.listener = nil
 		} else {
-			target.udpConn = nil
+			return fmt.Errorf("target not found: %s:%d", listenIP, port)
 		}
-		target.Unlock()
+	case "udp":
+		if targets, ok := pm.udpTargets[listenIP]; ok {
+			delete(targets, port)
+			// Remove and close the corresponding UDP connection
+			for i, conn := range pm.udpConns {
+				if addr, ok := conn.LocalAddr().(*net.UDPAddr); ok && addr.Port == port {
+					conn.Close()
+					time.Sleep(50 * time.Millisecond)
+					// Remove from slice
+					pm.udpConns = append(pm.udpConns[:i], pm.udpConns[i+1:]...)
+					break
+				}
+			}
+		} else {
+			return fmt.Errorf("target not found: %s:%d", listenIP, port)
+		}
+	default:
+		return fmt.Errorf("unsupported protocol: %s", proto)
+	}
+	return nil
+}
 
-		switch strings.ToLower(target.Protocol) {
+// Start begins listening for all configured proxy targets
-		case "tcp":
+func (pm *ProxyManager) Start() error {
-			go pm.serveTCP(target)
+	pm.mutex.Lock()
-		case "udp":
+	defer pm.mutex.Unlock()
-			go pm.serveUDP(target)
+
-		default:
+	if pm.running {
-			return fmt.Errorf("unsupported protocol: %s", target.Protocol)
+		return nil
+	}
+
+	// Start TCP targets
+	for listenIP, targets := range pm.tcpTargets {
+		for port, targetAddr := range targets {
+			if err := pm.startTarget("tcp", listenIP, port, targetAddr); err != nil {
+				return fmt.Errorf("failed to start TCP target: %v", err)
+			}
 		}
 	}
+
+	// Start UDP targets
+	for listenIP, targets := range pm.udpTargets {
+		for port, targetAddr := range targets {
+			if err := pm.startTarget("udp", listenIP, port, targetAddr); err != nil {
+				return fmt.Errorf("failed to start UDP target: %v", err)
+			}
+		}
+	}
+
+	pm.running = true
 	return nil
 }
 
 func (pm *ProxyManager) Stop() error {
-	pm.Lock()
+	pm.mutex.Lock()
-	defer pm.Unlock()
+	defer pm.mutex.Unlock()
 
-	var wg sync.WaitGroup
+	if !pm.running {
-	for i := range pm.targets {
+		return nil
-		target := &pm.targets[i]
-		wg.Add(1)
-		go func(t *ProxyTarget) {
-			defer wg.Done()
-			close(t.cancel)
-			t.Lock()
-			if t.listener != nil {
-				t.listener.Close()
-			}
-			if t.udpConn != nil {
-				t.udpConn.Close()
-			}
-			t.Unlock()
-			// Wait for the target to fully stop
-			<-t.done
-		}(target)
 	}
-	wg.Wait()
+
+	// Set running to false first to signal handlers to stop
+	pm.running = false
+
+	// Close TCP listeners
+	for i := len(pm.listeners) - 1; i >= 0; i-- {
+		listener := pm.listeners[i]
+		if err := listener.Close(); err != nil {
+			logger.Error("Error closing TCP listener: %v", err)
+		}
+		// Remove from slice
+		pm.listeners = append(pm.listeners[:i], pm.listeners[i+1:]...)
+	}
+
+	// Close UDP connections
+	for i := len(pm.udpConns) - 1; i >= 0; i-- {
+		conn := pm.udpConns[i]
+		if err := conn.Close(); err != nil {
+			logger.Error("Error closing UDP connection: %v", err)
+		}
+		// Remove from slice
+		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)
+
 	return nil
 }
 
-func (pm *ProxyManager) serveTCP(target *ProxyTarget) {
+func (pm *ProxyManager) startTarget(proto, listenIP string, port int, targetAddr string) error {
-	defer close(target.done) // Signal that this target is fully stopped
+	switch proto {
+	case "tcp":
+		listener, err := pm.tnet.ListenTCP(&net.TCPAddr{Port: port})
+		if err != nil {
+			return fmt.Errorf("failed to create TCP listener: %v", err)
+		}
 
-	listener, err := pm.tnet.ListenTCP(&net.TCPAddr{
+		pm.listeners = append(pm.listeners, listener)
-		IP:   net.ParseIP(target.Listen),
+		go pm.handleTCPProxy(listener, targetAddr)
-		Port: target.Port,
+
-	})
+	case "udp":
-	if err != nil {
+		addr := &net.UDPAddr{Port: port}
-		logger.Info("Failed to start TCP listener for %s:%d: %v", target.Listen, target.Port, err)
+		conn, err := pm.tnet.ListenUDP(addr)
-		return
+		if err != nil {
+			return fmt.Errorf("failed to create UDP listener: %v", err)
+		}
+
+		pm.udpConns = append(pm.udpConns, conn)
+		go pm.handleUDPProxy(conn, targetAddr)
+
+	default:
+		return fmt.Errorf("unsupported protocol: %s", proto)
 	}
 
-	target.Lock()
+	logger.Info("Started %s proxy from %s:%d to %s", proto, listenIP, port, targetAddr)
-	target.listener = listener
-	target.Unlock()
 
-	defer listener.Close()
+	return nil
-	logger.Info("TCP proxy listening on %s", listener.Addr())
+}
-
-	var activeConns sync.WaitGroup
-	acceptDone := make(chan struct{})
-
-	// Goroutine to handle shutdown signal
-	go func() {
-		<-target.cancel
-		close(acceptDone)
-		listener.Close()
-	}()
 
+func (pm *ProxyManager) handleTCPProxy(listener net.Listener, targetAddr string) {
 	for {
 		conn, err := listener.Accept()
 		if err != nil {
-			select {
+			// Check if we're shutting down or the listener was closed
-			case <-target.cancel:
+			if !pm.running {
-				// Wait for active connections to finish
-				activeConns.Wait()
 				return
-			default:
-				logger.Info("Failed to accept TCP connection: %v", err)
-				// Don't return here, try to accept new connections
-				time.Sleep(time.Second)
-				continue
 			}
+
+			// Check for specific network errors that indicate the listener is closed
+			if ne, ok := err.(net.Error); ok && !ne.Temporary() {
+				logger.Info("TCP listener closed, stopping proxy handler for %v", listener.Addr())
+				return
+			}
+
+			logger.Error("Error accepting TCP connection: %v", err)
+			// Don't hammer the CPU if we hit a temporary error
+			time.Sleep(100 * time.Millisecond)
+			continue
 		}
 
-		activeConns.Add(1)
 		go func() {
-			defer activeConns.Done()
+			target, err := net.Dial("tcp", targetAddr)
-			pm.handleTCPConnection(conn, target.Target, acceptDone)
+			if err != nil {
+				logger.Error("Error connecting to target: %v", err)
+				conn.Close()
+				return
+			}
+
+			// Create a WaitGroup to ensure both copy operations complete
+			var wg sync.WaitGroup
+			wg.Add(2)
+
+			go func() {
+				defer wg.Done()
+				io.Copy(target, conn)
+				target.Close()
+			}()
+
+			go func() {
+				defer wg.Done()
+				io.Copy(conn, target)
+				conn.Close()
+			}()
+
+			// Wait for both copies to complete
+			wg.Wait()
 		}()
 	}
 }
 
-func (pm *ProxyManager) handleTCPConnection(clientConn net.Conn, target string, done chan struct{}) {
+func (pm *ProxyManager) handleUDPProxy(conn *gonet.UDPConn, targetAddr string) {
-	defer clientConn.Close()
+	buffer := make([]byte, 65507) // Max UDP packet size
-
+	clientConns := make(map[string]*net.UDPConn)
-	serverConn, err := net.Dial("tcp", target)
+	var clientsMutex sync.RWMutex
-	if err != nil {
-		logger.Info("Failed to connect to target %s: %v", target, err)
-		return
-	}
-	defer serverConn.Close()
-
-	var wg sync.WaitGroup
-	wg.Add(2)
-
-	// Client -> Server
-	go func() {
-		defer wg.Done()
-		select {
-		case <-done:
-			return
-		default:
-			io.Copy(serverConn, clientConn)
-		}
-	}()
-
-	// Server -> Client
-	go func() {
-		defer wg.Done()
-		select {
-		case <-done:
-			return
-		default:
-			io.Copy(clientConn, serverConn)
-		}
-	}()
-
-	wg.Wait()
-}
-
-func (pm *ProxyManager) serveUDP(target *ProxyTarget) {
-	defer close(target.done) // Signal that this target is fully stopped
-
-	addr := &net.UDPAddr{
-		IP:   net.ParseIP(target.Listen),
-		Port: target.Port,
-	}
-
-	conn, err := pm.tnet.ListenUDP(addr)
-	if err != nil {
-		logger.Info("Failed to start UDP listener for %s:%d: %v", target.Listen, target.Port, err)
-		return
-	}
-
-	target.Lock()
-	target.udpConn = conn
-	target.Unlock()
-
-	defer conn.Close()
-	logger.Info("UDP proxy listening on %s", conn.LocalAddr())
-
-	buffer := make([]byte, 65535)
-	var activeConns sync.WaitGroup
 
 	for {
-		select {
+		n, remoteAddr, err := conn.ReadFrom(buffer)
-		case <-target.cancel:
+		if err != nil {
-			activeConns.Wait() // Wait for all active UDP handlers to complete
+			if !pm.running {
-			return
+				return
-		default:
-			n, remoteAddr, err := conn.ReadFrom(buffer)
-			if err != nil {
-				select {
-				case <-target.cancel:
-					activeConns.Wait()
-					return
-				default:
-					logger.Info("Failed to read UDP packet: %v", err)
-					continue
-				}
 			}
+			logger.Error("Error reading UDP packet: %v", err)
+			continue
+		}
 
-			targetAddr, err := net.ResolveUDPAddr("udp", target.Target)
+		clientKey := remoteAddr.String()
+		clientsMutex.RLock()
+		targetConn, exists := clientConns[clientKey]
+		clientsMutex.RUnlock()
+
+		if !exists {
+			targetUDPAddr, err := net.ResolveUDPAddr("udp", targetAddr)
 			if err != nil {
-				logger.Info("Failed to resolve target address %s: %v", target.Target, err)
+				logger.Error("Error resolving target address: %v", err)
 				continue
 			}
 
-			activeConns.Add(1)
+			targetConn, err = net.DialUDP("udp", nil, targetUDPAddr)
-			go func(data []byte, remote net.Addr) {
+			if err != nil {
-				defer activeConns.Done()
+				logger.Error("Error connecting to target: %v", err)
-				targetConn, err := net.DialUDP("udp", nil, targetAddr)
+				continue
-				if err != nil {
+			}
-					logger.Info("Failed to connect to target %s: %v", target.Target, err)
-					return
-				}
-				defer targetConn.Close()
 
-				select {
+			clientsMutex.Lock()
-				case <-target.cancel:
+			clientConns[clientKey] = targetConn
-					return
+			clientsMutex.Unlock()
-				default:
+
-					_, err = targetConn.Write(data)
+			go func() {
+				buffer := make([]byte, 65507)
+				for {
+					n, _, err := targetConn.ReadFromUDP(buffer)
 					if err != nil {
-						logger.Info("Failed to write to target: %v", err)
+						logger.Error("Error reading from target: %v", err)
 						return
 					}
 
-					response := make([]byte, 65535)
+					_, err = conn.WriteTo(buffer[:n], remoteAddr)
-					n, err := targetConn.Read(response)
 					if err != nil {
-						logger.Info("Failed to read response from target: %v", err)
+						logger.Error("Error writing to client: %v", err)
 						return
 					}
-
-					_, err = conn.WriteTo(response[:n], remote)
-					if err != nil {
-						logger.Info("Failed to write response to client: %v", err)
-					}
 				}
-			}(buffer[:n], remoteAddr)
+			}()
+		}
+
+		_, err = targetConn.Write(buffer[:n])
+		if err != nil {
+			logger.Error("Error writing to target: %v", err)
+			targetConn.Close()
+			clientsMutex.Lock()
+			delete(clientConns, clientKey)
+			clientsMutex.Unlock()
 		}
 	}
 }

proxy/types.go

@@ -1,28 +0,0 @@
-package proxy
-
-import (
-	"log"
-	"net"
-	"sync"
-
-	"golang.zx2c4.com/wireguard/tun/netstack"
-)
-
-type ProxyTarget struct {
-	Protocol   string
-	Listen     string
-	Port       int
-	Target     string
-	cancel     chan struct{}  // Channel to signal shutdown
-	done       chan struct{}  // Channel to signal completion
-	listener   net.Listener   // For TCP
-	udpConn    net.PacketConn // For UDP
-	sync.Mutex                // Protect access to connection
-}
-
-type ProxyManager struct {
-	targets      []ProxyTarget
-	tnet         *netstack.Net
-	log          *log.Logger
-	sync.RWMutex // Protect access to targets slice
-}