Add libbox wrapper

experimental/libbox/service.go

@@ -0,0 +1,120 @@
+package libbox
+
+import (
+	"context"
+	"net/netip"
+	"os"
+	"syscall"
+
+	"github.com/sagernet/sing-box"
+	"github.com/sagernet/sing-box/common/process"
+	"github.com/sagernet/sing-box/experimental/libbox/internal/procfs"
+	"github.com/sagernet/sing-box/experimental/libbox/platform"
+	"github.com/sagernet/sing-tun"
+	"github.com/sagernet/sing/common/control"
+	E "github.com/sagernet/sing/common/exceptions"
+	N "github.com/sagernet/sing/common/network"
+)
+
+type BoxService struct {
+	ctx      context.Context
+	cancel   context.CancelFunc
+	instance *box.Box
+}
+
+func NewService(configContent string, platformInterface PlatformInterface) (*BoxService, error) {
+	options, err := parseConfig(configContent)
+	if err != nil {
+		return nil, err
+	}
+	options.PlatformInterface = &platformInterfaceWrapper{platformInterface, platformInterface.UseProcFS()}
+	ctx, cancel := context.WithCancel(context.Background())
+	instance, err := box.New(ctx, options)
+	if err != nil {
+		cancel()
+		return nil, E.Cause(err, "create service")
+	}
+	return &BoxService{
+		ctx:      ctx,
+		cancel:   cancel,
+		instance: instance,
+	}, nil
+}
+
+func (s *BoxService) Start() error {
+	return s.instance.Start()
+}
+
+func (s *BoxService) Close() error {
+	s.cancel()
+	return s.instance.Close()
+}
+
+var _ platform.Interface = (*platformInterfaceWrapper)(nil)
+
+type platformInterfaceWrapper struct {
+	iif       PlatformInterface
+	useProcFS bool
+}
+
+func (w *platformInterfaceWrapper) AutoDetectInterfaceControl() control.Func {
+	return func(network, address string, conn syscall.RawConn) error {
+		return control.Raw(conn, func(fd uintptr) error {
+			return w.iif.AutoDetectInterfaceControl(int32(fd))
+		})
+	}
+}
+
+func (w *platformInterfaceWrapper) OpenTun(options tun.Options) (tun.Tun, error) {
+	if len(options.IncludeUID) > 0 || len(options.ExcludeUID) > 0 {
+		return nil, E.New("android: unsupported uid options")
+	}
+	if len(options.IncludeAndroidUser) > 0 {
+		return nil, E.New("android: unsupported android_user option")
+	}
+
+	optionsWrapper := tunOptions(options)
+	tunInterface, err := w.iif.OpenTun(&optionsWrapper)
+	if err != nil {
+		return nil, err
+	}
+	tunFd := tunInterface.FileDescriptor()
+	return &nativeTun{
+		tunFd:   int(tunFd),
+		tunFile: os.NewFile(uintptr(tunFd), "tun"),
+		tunMTU:  options.MTU,
+		closer:  tunInterface,
+	}, nil
+}
+
+func (w *platformInterfaceWrapper) Write(p []byte) (n int, err error) {
+	w.iif.WriteLog(string(p))
+	return len(p), nil
+}
+
+func (w *platformInterfaceWrapper) FindProcessInfo(ctx context.Context, network string, source netip.AddrPort, destination netip.AddrPort) (*process.Info, error) {
+	var uid int32
+	if w.useProcFS {
+		uid = procfs.ResolveSocketByProcSearch(network, source, destination)
+		if uid == -1 {
+			return nil, E.New("procfs: not found")
+		}
+	} else {
+		var ipProtocol int32
+		switch N.NetworkName(network) {
+		case N.NetworkTCP:
+			ipProtocol = syscall.IPPROTO_TCP
+		case N.NetworkUDP:
+			ipProtocol = syscall.IPPROTO_UDP
+		default:
+			return nil, E.New("unknown network: ", network)
+		}
+		var err error
+		uid, err = w.iif.FindConnectionOwner(ipProtocol, source.Addr().String(), int32(source.Port()), destination.Addr().String(), int32(destination.Port()))
+		if err != nil {
+			return nil, err
+		}
+	}
+	packageName, _ := w.iif.PackageNameByUid(uid)
+	return &process.Info{UserId: uid, PackageName: packageName}, nil
+}