Add filemanager api

experimental/libbox/log.go

@@ -27,3 +27,27 @@ func RedirectStderr(path string) error {
 	stderrFile = outputFile
 	return nil
 }
+
+func RedirectStderrAsUser(path string, uid, gid int) error {
+	if stats, err := os.Stat(path); err == nil && stats.Size() > 0 {
+		_ = os.Rename(path, path+".old")
+	}
+	outputFile, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	err = outputFile.Chown(uid, gid)
+	if err != nil {
+		outputFile.Close()
+		os.Remove(outputFile.Name())
+		return err
+	}
+	err = unix.Dup2(int(outputFile.Fd()), int(os.Stderr.Fd()))
+	if err != nil {
+		outputFile.Close()
+		os.Remove(outputFile.Name())
+		return err
+	}
+	stderrFile = outputFile
+	return nil
+}

experimental/libbox/service.go

@@ -16,6 +16,7 @@ import (
 	"github.com/sagernet/sing/common/control"
 	E "github.com/sagernet/sing/common/exceptions"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/service/filemanager"
 )
 
 type BoxService struct {
@@ -30,6 +31,7 @@ func NewService(configContent string, platformInterface PlatformInterface) (*Box
 		return nil, err
 	}
 	ctx, cancel := context.WithCancel(context.Background())
+	ctx = filemanager.WithDefault(ctx, sBasePath, sTempPath, sUserID, sGroupID)
 	instance, err := box.New(box.Options{
 		Context:           ctx,
 		Options:           options,

experimental/libbox/setup.go

@@ -1,17 +1,31 @@
 package libbox
 
 import (
+	"os"
+
 	C "github.com/sagernet/sing-box/constant"
 
 	"github.com/dustin/go-humanize"
 )
 
-func SetBasePath(path string) {
-	C.SetBasePath(path)
-}
+var (
+	sBasePath string
+	sTempPath string
+	sUserID   int
+	sGroupID  int
+)
 
-func SetTempPath(path string) {
-	C.SetTempPath(path)
+func Setup(basePath string, tempPath string, userID int, groupID int) {
+	sBasePath = basePath
+	sTempPath = tempPath
+	sUserID = userID
+	sGroupID = groupID
+	if sUserID == -1 {
+		sUserID = os.Getuid()
+	}
+	if sGroupID == -1 {
+		sGroupID = os.Getgid()
+	}
 }
 
 func Version() string {