Add SSH keepalive, fix SOCKS5 format bug, implement web GUI

Makefile

@@ -1,8 +1,10 @@
 BINARY_NAME=gotun
+GUI_BINARY_NAME=gotun-gui
 VERSION=$(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
 BUILD_DIR=./build
 LDFLAGS=-ldflags "-X main.Version=$(VERSION) -s -w"
 MAIN_PACKAGE=./cmd/gotun
+GUI_PACKAGE=./cmd/gotun-gui
 
 # Go命令
 GOCMD=go
@@ -29,7 +31,8 @@ build:
 	@echo "Building $(BINARY_NAME)..."
 	@mkdir -p $(BUILD_DIR)
 	@$(GOBUILD) $(LDFLAGS) -o $(BUILD_DIR)/$(BINARY_NAME) $(MAIN_PACKAGE)
-	@echo "Build complete: $(BUILD_DIR)/$(BINARY_NAME)"
+	@$(GOBUILD) $(LDFLAGS) -o $(BUILD_DIR)/$(GUI_BINARY_NAME) $(GUI_PACKAGE)
+	@echo "Build complete: $(BUILD_DIR)/$(BINARY_NAME), $(BUILD_DIR)/$(GUI_BINARY_NAME)"
 
 # 交叉编译
 build-all: build-linux build-windows build-darwin

cmd/gotun-gui/main.go

@@ -0,0 +1,71 @@
+// gotun-gui is a web-based graphical interface for the gotun SSH proxy tool.
+//
+// It starts a local web server on 127.0.0.1:8089 (by default) and opens the
+// control panel in the browser, allowing users to configure and manage the
+// gotun SSH tunnel without using the command line.
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/Sesame2/gotun/gui"
+	"github.com/Sesame2/gotun/internal/config"
+	"github.com/spf13/cobra"
+)
+
+var (
+	Version = "dev"
+
+	cfg     = config.NewConfig()
+	guiAddr string
+)
+
+var rootCmd = &cobra.Command{
+	Use:     "gotun-gui",
+	Version: Version,
+	Short:   "GoTun 图形界面管理工具",
+	Long: `gotun-gui 启动一个本地 Web 控制面板，让你通过浏览器管理 gotun 代理。
+
+无需参数即可启动控制面板，在启动后可通过界面配置 SSH 服务器信息并控制代理的启停。`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		// If a SSH target is provided (user@host), pre-fill config.
+		if len(args) == 1 {
+			parts := strings.SplitN(args[0], "@", 2)
+			if len(parts) == 2 {
+				cfg.SSHUser = parts[0]
+				host := parts[1]
+				if !strings.Contains(host, ":") {
+					host = fmt.Sprintf("%s:%s", host, cfg.SSHPort)
+				}
+				cfg.SSHServer = host
+			}
+		}
+
+		app := gui.NewApp(cfg, guiAddr)
+		fmt.Printf("GoTun GUI 正在启动，请在浏览器中打开 http://%s\n", guiAddr)
+		return app.Run()
+	},
+}
+
+func init() {
+	rootCmd.Flags().StringVar(&guiAddr, "gui-addr", "127.0.0.1:8089", "Web 控制面板监听地址")
+	rootCmd.Flags().StringVarP(&cfg.SSHPort, "port", "p", "22", "SSH 服务器端口")
+	rootCmd.Flags().StringVar(&cfg.SSHPassword, "pass", "", "SSH 密码")
+	rootCmd.Flags().StringVarP(&cfg.SSHKeyFile, "identity_file", "i", "", "SSH 私钥文件路径")
+	rootCmd.Flags().StringVarP(&cfg.ListenAddr, "http", "l", ":8080", "HTTP 代理监听地址")
+	rootCmd.Flags().StringVar(&cfg.SocksAddr, "socks5", ":1080", "SOCKS5 代理监听地址")
+	rootCmd.Flags().BoolVar(&cfg.SystemProxy, "sys-proxy", true, "自动设置/恢复系统代理")
+	rootCmd.Flags().BoolVarP(&cfg.Verbose, "verbose", "v", false, "启用详细日志")
+	rootCmd.Flags().StringVar(&cfg.RuleFile, "rules", "", "代理规则配置文件路径")
+	rootCmd.Args = cobra.MaximumNArgs(1)
+}
+
+func main() {
+	rootCmd.Version = Version
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}