Enhance error handling and user feedback in the web server's index handler

internal/scanner/port_scanner.go

@@ -102,7 +102,7 @@ func (ps *PortScanner) parseNetstatOutput(output, protocol string) ([]types.Port
 			continue
 		}
 
-		port, err := ps.parseNetstatLine(line, protocol)
+		port, err := ps.parseNetstatLineMacOS(line, protocol)
 		if err != nil {
 			continue // 跳过解析失败的行
 		}
@@ -118,31 +118,54 @@ func (ps *PortScanner) parseNetstatOutput(output, protocol string) ([]types.Port
 	return ports, nil
 }
 
-// parseNetstatLine 解析netstat的单行输出
-func (ps *PortScanner) parseNetstatLine(line, protocol string) (*types.PortInfo, error) {
+// parseNetstatLineMacOS 解析macOS netstat的单行输出
+func (ps *PortScanner) parseNetstatLineMacOS(line, protocol string) (*types.PortInfo, error) {
 	fields := regexp.MustCompile(`\s+`).Split(line, -1)
-	if len(fields) < 3 {
+	if len(fields) < 4 {
 		return nil, fmt.Errorf("invalid line format")
 	}
 
-	// 解析本地地址
-	localAddr := fields[0]
-	parts := strings.Split(localAddr, ":")
-	if len(parts) < 2 {
-		return nil, fmt.Errorf("invalid address format")
+	// macOS netstat格式: Proto Recv-Q Send-Q Local-Address Foreign-Address (state)
+	localAddr := fields[3]
+	state := ""
+	if len(fields) >= 6 {
+		state = fields[5]
+	}
+
+	// 解析本地地址，可能包含IPv6地址
+	var portStr string
+	if strings.Contains(localAddr, ".") {
+		// IPv4 格式: ip.port
+		parts := strings.Split(localAddr, ".")
+		if len(parts) >= 2 {
+			portStr = parts[len(parts)-1]
+		}
+	} else if strings.Contains(localAddr, ":") {
+		// IPv6 格式: [ip]:port 或 ip:port
+		if strings.Contains(localAddr, "]:") {
+			// [ip]:port
+			parts := strings.Split(localAddr, "]:")
+			if len(parts) == 2 {
+				portStr = parts[1]
+			}
+		} else {
+			// ip:port (简单情况)
+			parts := strings.Split(localAddr, ":")
+			if len(parts) >= 2 {
+				portStr = parts[len(parts)-1]
+			}
+		}
+	}
+
+	if portStr == "" {
+		return nil, fmt.Errorf("could not extract port from address: %s", localAddr)
 	}
 
-	portStr := parts[len(parts)-1]
 	port, err := strconv.Atoi(portStr)
 	if err != nil {
 		return nil, fmt.Errorf("invalid port: %s", portStr)
 	}
 
-	state := ""
-	if protocol == "tcp" && len(fields) >= 4 {
-		state = fields[3]
-	}
-
 	return &types.PortInfo{
 		Port:     port,
 		Protocol: protocol,
@@ -154,15 +177,18 @@ func (ps *PortScanner) parseNetstatLine(line, protocol string) (*types.PortInfo,
 // shouldIncludePort 判断是否应该包含此端口
 func (ps *PortScanner) shouldIncludePort(port *types.PortInfo) bool {
 	if port.Protocol == "tcp" {
-		if port.State == "LISTEN" {
+		// macOS netstat 状态值可能包括: LISTEN, ESTABLISHED, SYN_SENT, etc.
+		if strings.Contains(port.State, "LISTEN") {
 			return ps.includeListening
 		}
-		if port.State == "ESTABLISHED" {
+		if strings.Contains(port.State, "ESTABLISHED") {
 			return ps.includeEstablished
 		}
+		// 对于其他状态，如果设置了包含监听端口，也包含进来
+		return ps.includeListening
 	}
 
-	// UDP端口默认包含
+	// UDP端口默认包含（如果启用了监听端口）
 	if port.Protocol == "udp" {
 		return ps.includeListening
 	}