Update main.go

fixed some errors, This file should be ok.
2026-02-08 05:56:40 +00:00 · 2025-06-30 13:03:06 +02:00
parent 700287163e
commit 9db3b78373
1 changed files with 82 additions and 15 deletions
--- a/main.go
+++ b/main.go
@@ -50,11 +50,16 @@ type TargetData struct {
 }

 func fixKey(key string) string {
+	// Remove any whitespace
 	key = strings.TrimSpace(key)
+
+	// Decode from base64
 	decoded, err := base64.StdEncoding.DecodeString(key)
 	if err != nil {
 		logger.Fatal("Error decoding base64: %v", err)
 	}
+
+	// Convert to hex
 	return hex.EncodeToString(decoded)
 }

@@ -110,7 +115,6 @@ func ping(tnet *netstack.Net, dst string) error {
 	return nil
 }

-// --- CHANGED: added healthFile as parameter ---
 func startPingCheck(tnet *netstack.Net, serverIP string, stopChan chan struct{}, healthFile string) {
 	initialInterval := 10 * time.Second
 	maxInterval := 60 * time.Second
@@ -127,23 +131,28 @@ func startPingCheck(tnet *netstack.Net, serverIP string, stopChan chan struct{},
 				err := ping(tnet, serverIP)
 				if err != nil {
 					consecutiveFailures++
-					logger.Warn("Periodic ping failed (%d consecutive failures): %v", consecutiveFailures, err)
+					logger.Warn("Periodic ping failed (%d consecutive failures): %v",
+						consecutiveFailures, err)
 					logger.Warn("HINT: Do you have UDP port 51820 (or the port in config.yml) open on your Pangolin server?")
-					// --- CHANGED: Only remove file if healthFile is set ---
+
+					// Only remove file if healthFile is set
 					if consecutiveFailures >= 3 && healthFile != "" {
 						_ = os.Remove(healthFile)
 					}
+					
 					// Increase interval if we have consistent failures, with a maximum cap
 					if consecutiveFailures >= 3 && currentInterval < maxInterval {
+						// Increase by 50% each time, up to the maximum
 						currentInterval = time.Duration(float64(currentInterval) * 1.5)
 						if currentInterval > maxInterval {
 							currentInterval = maxInterval
 						}
 						ticker.Reset(currentInterval)
-						logger.Info("Increased ping check interval to %v due to consecutive failures", currentInterval)
+						logger.Info("Increased ping check interval to %v due to consecutive failures",
+							currentInterval)
 					}
 				} else {
-					// --- CHANGED: Only write file if healthFile is set ---
+					// Only write file if healthFile is set
 					if healthFile != "" {
 						err := os.WriteFile(healthFile, []byte("ok"), 0644)
 						if err != nil {
@@ -157,7 +166,8 @@ func startPingCheck(tnet *netstack.Net, serverIP string, stopChan chan struct{},
 							currentInterval = initialInterval
 						}
 						ticker.Reset(currentInterval)
-						logger.Info("Decreased ping check interval to %v after successful ping", currentInterval)
+						logger.Info("Decreased ping check interval to %v after successful ping",
+							currentInterval)
 					}
 					consecutiveFailures = 0
 				}
@@ -169,6 +179,7 @@ func startPingCheck(tnet *netstack.Net, serverIP string, stopChan chan struct{},
 	}()
 }

+// Function to track connection status and trigger reconnection as needed
 func monitorConnectionStatus(tnet *netstack.Net, serverIP string, client *websocket.Client) {
 	const checkInterval = 30 * time.Second
 	connectionLost := false
@@ -178,18 +189,27 @@ func monitorConnectionStatus(tnet *netstack.Net, serverIP string, client *websoc
 	for {
 		select {
 		case <-ticker.C:
+			// Try a ping to see if connection is alive
 			err := ping(tnet, serverIP)
+
 			if err != nil && !connectionLost {
+				// We just lost connection
 				connectionLost = true
 				logger.Warn("Connection to server lost. Continuous reconnection attempts will be made.")
+
+				// Notify the user they might need to check their network
 				logger.Warn("Please check your internet connection and ensure the Pangolin server is online.")
 				logger.Warn("Newt will continue reconnection attempts automatically when connectivity is restored.")
 			} else if err == nil && connectionLost {
+				// Connection has been restored
 				connectionLost = false
 				logger.Info("Connection to server restored!")
+
+				// Tell the server we're back
 				err := client.SendMessage("newt/wg/register", map[string]interface{}{
 					"publicKey": privateKey.PublicKey().String(),
 				})
+
 				if err != nil {
 					logger.Error("Failed to send registration message after reconnection: %v", err)
 				} else {
@@ -204,25 +224,32 @@ func pingWithRetry(tnet *netstack.Net, dst string) error {
 	const (
 		initialMaxAttempts = 15
 		initialRetryDelay  = 2 * time.Second
-		maxRetryDelay      = 60 * time.Second
+		maxRetryDelay      = 60 * time.Second // Cap the maximum delay
 	)

 	attempt := 1
 	retryDelay := initialRetryDelay

+	// First try with the initial parameters
 	logger.Info("Ping attempt %d", attempt)
 	if err := ping(tnet, dst); err == nil {
+		// Successful ping
 		return nil
 	} else {
 		logger.Warn("Ping attempt %d failed: %v", attempt, err)
 	}

+	// Start a goroutine that will attempt pings indefinitely with increasing delays
 	go func() {
-		attempt = 2
+		attempt = 2 // Continue from attempt 2
+
 		for {
 			logger.Info("Ping attempt %d", attempt)
+
 			if err := ping(tnet, dst); err != nil {
 				logger.Warn("Ping attempt %d failed: %v", attempt, err)
+
+				// Increase delay after certain thresholds but cap it
 				if attempt%5 == 0 && retryDelay < maxRetryDelay {
 					retryDelay = time.Duration(float64(retryDelay) * 1.5)
 					if retryDelay > maxRetryDelay {
@@ -230,14 +257,18 @@ func pingWithRetry(tnet *netstack.Net, dst string) error {
 					}
 					logger.Info("Increasing ping retry delay to %v", retryDelay)
 				}
+
 				time.Sleep(retryDelay)
 				attempt++
 			} else {
+				// Successful ping
 				logger.Info("Ping succeeded after %d attempts", attempt)
 				return
 			}
 		}
 	}()
+
+	// Return an error for the first batch of attempts (to maintain compatibility with existing code)
 	return fmt.Errorf("initial ping attempts failed, continuing in background")
 }

@@ -254,7 +285,7 @@ func parseLogLevel(level string) logger.LogLevel {
 	case "FATAL":
 		return logger.FATAL
 	default:
-		return logger.INFO
+		return logger.INFO // default to INFO if invalid level provided
 	}
 }

@@ -262,6 +293,8 @@ func mapToWireGuardLogLevel(level logger.LogLevel) int {
 	switch level {
 	case logger.DEBUG:
 		return device.LogLevelVerbose
+	// case logger.INFO:
+	// return device.LogLevel
 	case logger.WARN:
 		return device.LogLevelError
 	case logger.ERROR, logger.FATAL:
@@ -272,23 +305,32 @@ func mapToWireGuardLogLevel(level logger.LogLevel) int {
 }

 func resolveDomain(domain string) (string, error) {
+	// Check if there's a port in the domain
 	host, port, err := net.SplitHostPort(domain)
 	if err != nil {
+		// No port found, use the domain as is
 		host = domain
 		port = ""
 	}
+
+	// Remove any protocol prefix if present
 	if strings.HasPrefix(host, "http://") {
 		host = strings.TrimPrefix(host, "http://")
 	} else if strings.HasPrefix(host, "https://") {
 		host = strings.TrimPrefix(host, "https://")
 	}
+
+	// Lookup IP addresses
 	ips, err := net.LookupIP(host)
 	if err != nil {
 		return "", fmt.Errorf("DNS lookup failed: %v", err)
 	}
+
 	if len(ips) == 0 {
 		return "", fmt.Errorf("no IP addresses found for domain %s", host)
 	}
+
+	// Get the first IPv4 address if available
 	var ipAddr string
 	for _, ip := range ips {
 		if ipv4 := ip.To4(); ipv4 != nil {
@@ -296,16 +338,20 @@ func resolveDomain(domain string) (string, error) {
 			break
 		}
 	}
+
+	// If no IPv4 found, use the first IP (might be IPv6)
 	if ipAddr == "" {
 		ipAddr = ips[0].String()
 	}
+
+	// Add port back if it existed
 	if port != "" {
 		ipAddr = net.JoinHostPort(ipAddr, port)
 	}
+
 	return ipAddr, nil
 }

-// --- ADDED: healthFile variable ---
 var (
 	endpoint      string
 	id            string
@@ -323,6 +369,7 @@ var (
 )

 func main() {
+	// if PANGOLIN_ENDPOINT, NEWT_ID, and NEWT_SECRET are set as environment variables, they will be used as default values
 	endpoint = os.Getenv("PANGOLIN_ENDPOINT")
 	id = os.Getenv("NEWT_ID")
 	secret = os.Getenv("NEWT_SECRET")
@@ -361,12 +408,14 @@ func main() {
 	if dockerSocket == "" {
 		flag.StringVar(&dockerSocket, "docker-socket", "", "Path to Docker socket (typically /var/run/docker.sock)")
 	}
-	// --- ADDED: CLI flag for healthFile if not set by env ---
+	// CLI flag for healthFile if not set by env
 	if healthFile == "" {
 		flag.StringVar(&healthFile, "health-file", "", "Path to health file (if unset, health file won’t be written)")
 	}

+	// do a --version check
 	version := flag.Bool("version", false, "Print the version")
+
 	flag.Parse()

 	newtVersion := "Newt version replaceme"
@@ -381,6 +430,7 @@ func main() {
 	loggerLevel := parseLogLevel(logLevel)
 	logger.GetLogger().SetLevel(parseLogLevel(logLevel))

+	// parse the mtu string into an int
 	mtuInt, err = strconv.Atoi(mtu)
 	if err != nil {
 		logger.Fatal("Failed to parse MTU: %v", err)
@@ -394,13 +444,18 @@ func main() {
 	if tlsPrivateKey != "" {
 		opt = websocket.WithTLSConfig(tlsPrivateKey)
 	}
+	// Create a new client
 	client, err := websocket.NewClient(
-		id, secret, endpoint, opt,
+		id,     // CLI arg takes precedence
+		secret, // CLI arg takes precedence
+		endpoint,
+		opt,
 	)
 	if err != nil {
 		logger.Fatal("Failed to create client: %v", err)
 	}

+	// Create TUN device and network stack
 	var tun tun.Device
 	var tnet *netstack.Net
 	var dev *device.Device
@@ -422,12 +477,14 @@ func main() {
 	pingStopChan := make(chan struct{})
 	defer close(pingStopChan)

+	// Register handlers for different message types
 	client.RegisterHandler("newt/wg/connect", func(msg websocket.WSMessage) {
 		logger.Info("Received registration message")

 		if connected {
 			logger.Info("Already connected! But I will send a ping anyway...")
-			_ = pingWithRetry(tnet, wgData.ServerIP)
+			// Even if pingWithRetry returns an error, it will continue trying in the background
+			_ = pingWithRetry(tnet, wgData.ServerIP) // Ignoring initial error as pings will continue
 			return
 		}

@@ -451,6 +508,7 @@ func main() {
 			logger.Error("Failed to create TUN device: %v", err)
 		}

+		// Create WireGuard device
 		dev = device.NewDevice(tun, conn.NewDefaultBind(), device.NewLogger(
 			mapToWireGuardLogLevel(loggerLevel),
 			"wireguard: ",
@@ -462,6 +520,7 @@ func main() {
 			return
 		}

+		// Configure WireGuard
 		config := fmt.Sprintf(`private_key=%s
 public_key=%s
 allowed_ip=%s/32
@@ -473,6 +532,7 @@ persistent_keepalive_interval=5`, fixKey(privateKey.String()), fixKey(wgData.Pub
 			logger.Error("Failed to configure WireGuard device: %v", err)
 		}

+		// Bring up the device
 		err = dev.Up()
 		if err != nil {
 			logger.Error("Failed to bring up WireGuard device: %v", err)
@@ -480,21 +540,29 @@ persistent_keepalive_interval=5`, fixKey(privateKey.String()), fixKey(wgData.Pub

 		logger.Info("WireGuard device created. Lets ping the server now...")

+		// Even if pingWithRetry returns an error, it will continue trying in the background
 		_ = pingWithRetry(tnet, wgData.ServerIP)

+		// Always mark as connected and start the proxy manager regardless of initial ping result
+		// as the pings will continue in the background
 		if !connected {
 			logger.Info("Starting ping check")
-			// --- CHANGED: Pass healthFile to startPingCheck ---
 			startPingCheck(tnet, wgData.ServerIP, pingStopChan, healthFile)
+
+			// Start connection monitoring in a separate goroutine
 			go monitorConnectionStatus(tnet, wgData.ServerIP, client)
 		}

+		// Create proxy manager
 		pm = proxy.NewProxyManager(tnet)
+
 		connected = true

+		// add the targets if there are any
 		if len(wgData.Targets.TCP) > 0 {
 			updateTargets(pm, "add", wgData.TunnelIP, "tcp", TargetData{Targets: wgData.Targets.TCP})
 		}
+
 		if len(wgData.Targets.UDP) > 0 {
 			updateTargets(pm, "add", wgData.TunnelIP, "udp", TargetData{Targets: wgData.Targets.UDP})
 		}
@@ -505,7 +573,6 @@ persistent_keepalive_interval=5`, fixKey(privateKey.String()), fixKey(wgData.Pub
 		}
 	})

-}
 	client.RegisterHandler("newt/tcp/add", func(msg websocket.WSMessage) {
 		logger.Info("Received: %+v", msg)