feat: add loopback outbound

Co-authored-by: Shelikhoo <xiaokangwang@outlook.com>

infra/conf/loopback.go

@@ -0,0 +1,14 @@
+package conf
+
+import (
+	"github.com/golang/protobuf/proto"
+	"github.com/xtls/xray-core/proxy/loopback"
+)
+
+type LoopbackConfig struct {
+	InboundTag string `json:"inboundTag"`
+}
+
+func (l LoopbackConfig) Build() (proto.Message, error) {
+	return &loopback.Config{InboundTag: l.InboundTag}, nil
+}

infra/conf/xray.go

@@ -2,11 +2,12 @@ package conf
 
 import (
 	"encoding/json"
-	"github.com/xtls/xray-core/transport/internet"
 	"log"
 	"os"
 	"strings"
 
+	"github.com/xtls/xray-core/transport/internet"
+
 	"github.com/xtls/xray-core/app/dispatcher"
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/app/stats"
@@ -38,6 +39,7 @@ var (
 		"trojan":      func() interface{} { return new(TrojanClientConfig) },
 		"mtproto":     func() interface{} { return new(MTProtoClientConfig) },
 		"dns":         func() interface{} { return new(DNSOutboundConfig) },
+		"loopback":    func() interface{} { return new(LoopbackConfig) },
 	}, "protocol", "settings")
 
 	ctllog = log.New(os.Stderr, "xctl> ", 0)