add ipv4-only support for listener

listener/ws/listener.go

@@ -11,6 +11,7 @@ import (
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
 	metrics "github.com/go-gost/core/metrics/wrapper"
+	xnet "github.com/go-gost/x/internal/net"
 	ws_util "github.com/go-gost/x/internal/util/ws"
 	"github.com/go-gost/x/registry"
 	"github.com/gorilla/websocket"
@@ -80,7 +81,11 @@ func (l *wsListener) Init(md md.Metadata) (err error) {
 	l.cqueue = make(chan net.Conn, l.md.backlog)
 	l.errChan = make(chan error, 1)
 
-	ln, err := net.Listen("tcp", l.options.Addr)
+	network := "tcp"
+	if xnet.IsIPv4(l.options.Addr) {
+		network = "tcp4"
+	}
+	ln, err := net.Listen(network, l.options.Addr)
 	if err != nil {
 		return
 	}