fix domain socket abstract name and add jsonv5 support

transport/internet/domainsocket/config.go

@@ -16,8 +16,8 @@ func (c *Config) GetUnixAddr() (*net.UnixAddr, error) {
 	if path == "" {
 		return nil, newError("empty domain socket path")
 	}
-	if c.Abstract && path[0] != '@' {
-		path = "@" + path
+	if c.Abstract && path[0] != '\x00' {
+		path = "\x00" + path
 	}
 	if c.Abstract && c.Padding {
 		raw := []byte(path)

transport/internet/domainsocket/config.pb.go

@@ -1,6 +1,7 @@
 package domainsocket
 
 import (
+	_ "github.com/v2fly/v2ray-core/v5/common/protoext"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -92,23 +93,27 @@ var file_transport_internet_domainsocket_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/domainsocket/config.proto

@@ -6,7 +6,12 @@ option go_package = "github.com/v2fly/v2ray-core/v5/transport/internet/domainsoc
 option java_package = "com.v2ray.core.transport.internet.domainsocket";
 option java_multiple_files = true;
 
+import "common/protoext/extensions.proto";
+
 message Config {
+  option (v2ray.core.common.protoext.message_opt).type = "transport";
+  option (v2ray.core.common.protoext.message_opt).short_name = "domainsocket";
+
   // Path of the domain socket. This overrides the IP/Port parameter from
   // upstream caller.
   string path = 1;