v1.0.0

testing/servers/udp/port.go

@@ -0,0 +1,19 @@
+package udp
+
+import (
+	"github.com/xtls/xray-core/v1/common"
+	"github.com/xtls/xray-core/v1/common/net"
+)
+
+// PickPort returns an unused UDP port in the system. The port returned is highly likely to be unused, but not guaranteed.
+func PickPort() net.Port {
+	conn, err := net.ListenUDP("udp4", &net.UDPAddr{
+		IP:   net.LocalHostIP.IP(),
+		Port: 0,
+	})
+	common.Must(err)
+	defer conn.Close()
+
+	addr := conn.LocalAddr().(*net.UDPAddr)
+	return net.Port(addr.Port)
+}