chore: add loopback detect for direct outbound

common/callback/close_callback.go

@@ -0,0 +1,61 @@
+package callback
+
+import (
+	"sync"
+
+	C "github.com/metacubex/mihomo/constant"
+)
+
+type closeCallbackConn struct {
+	C.Conn
+	closeFunc func()
+	closeOnce sync.Once
+}
+
+func (w *closeCallbackConn) Close() error {
+	w.closeOnce.Do(w.closeFunc)
+	return w.Conn.Close()
+}
+
+func (w *closeCallbackConn) ReaderReplaceable() bool {
+	return true
+}
+
+func (w *closeCallbackConn) WriterReplaceable() bool {
+	return true
+}
+
+func (w *closeCallbackConn) Upstream() any {
+	return w.Conn
+}
+
+func NewCloseCallbackConn(conn C.Conn, callback func()) C.Conn {
+	return &closeCallbackConn{Conn: conn, closeFunc: callback}
+}
+
+type closeCallbackPacketConn struct {
+	C.PacketConn
+	closeFunc func()
+	closeOnce sync.Once
+}
+
+func (w *closeCallbackPacketConn) Close() error {
+	w.closeOnce.Do(w.closeFunc)
+	return w.PacketConn.Close()
+}
+
+func (w *closeCallbackPacketConn) ReaderReplaceable() bool {
+	return true
+}
+
+func (w *closeCallbackPacketConn) WriterReplaceable() bool {
+	return true
+}
+
+func (w *closeCallbackPacketConn) Upstream() any {
+	return w.PacketConn
+}
+
+func NewCloseCallbackPacketConn(conn C.PacketConn, callback func()) C.PacketConn {
+	return &closeCallbackPacketConn{PacketConn: conn, closeFunc: callback}
+}