update

pkg/plugin/builtin/echo.go

@@ -0,0 +1,95 @@
+package builtin
+
+import (
+	"io"
+	"log"
+	"net"
+	"sync"
+
+	"github.com/gotunnel/pkg/plugin"
+)
+
+func init() {
+	RegisterClientPlugin(NewEchoPlugin())
+}
+
+// EchoPlugin 回显插件 - 客户端插件示例
+type EchoPlugin struct {
+	config   map[string]string
+	listener net.Listener
+	running  bool
+	mu       sync.Mutex
+}
+
+// NewEchoPlugin 创建 Echo 插件
+func NewEchoPlugin() *EchoPlugin {
+	return &EchoPlugin{}
+}
+
+// Metadata 返回插件信息
+func (p *EchoPlugin) Metadata() plugin.PluginMetadata {
+	return plugin.PluginMetadata{
+		Name:        "echo",
+		Version:     "1.0.0",
+		Type:        plugin.PluginTypeApp,
+		Source:      plugin.PluginSourceBuiltin,
+		RunAt:       plugin.SideClient,
+		Description: "Echo server (client plugin example)",
+		Author:      "GoTunnel",
+		RuleSchema: &plugin.RuleSchema{
+			NeedsLocalAddr: false,
+		},
+	}
+}
+
+// Init 初始化插件
+func (p *EchoPlugin) Init(config map[string]string) error {
+	p.config = config
+	return nil
+}
+
+// Start 启动服务
+func (p *EchoPlugin) Start() (string, error) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if p.running {
+		return "", nil
+	}
+
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		return "", err
+	}
+
+	p.listener = ln
+	p.running = true
+
+	log.Printf("[Echo] Started on %s", ln.Addr().String())
+	return ln.Addr().String(), nil
+}
+
+// HandleConn 处理连接
+func (p *EchoPlugin) HandleConn(conn net.Conn) error {
+	defer conn.Close()
+	log.Printf("[Echo] New connection from tunnel")
+	_, err := io.Copy(conn, conn)
+	return err
+}
+
+// Stop 停止服务
+func (p *EchoPlugin) Stop() error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if !p.running {
+		return nil
+	}
+
+	if p.listener != nil {
+		p.listener.Close()
+	}
+	p.running = false
+	log.Printf("[Echo] Stopped")
+	return nil
+}