v1.0.0

transport/internet/udp/hub_linux.go

@@ -0,0 +1,33 @@
+// +build linux
+
+package udp
+
+import (
+	"syscall"
+
+	"github.com/xtls/xray-core/v1/common/net"
+	"golang.org/x/sys/unix"
+)
+
+func RetrieveOriginalDest(oob []byte) net.Destination {
+	msgs, err := syscall.ParseSocketControlMessage(oob)
+	if err != nil {
+		return net.Destination{}
+	}
+	for _, msg := range msgs {
+		if msg.Header.Level == syscall.SOL_IP && msg.Header.Type == syscall.IP_RECVORIGDSTADDR {
+			ip := net.IPAddress(msg.Data[4:8])
+			port := net.PortFromBytes(msg.Data[2:4])
+			return net.UDPDestination(ip, port)
+		} else if msg.Header.Level == syscall.SOL_IPV6 && msg.Header.Type == unix.IPV6_RECVORIGDSTADDR {
+			ip := net.IPAddress(msg.Data[8:24])
+			port := net.PortFromBytes(msg.Data[2:4])
+			return net.UDPDestination(ip, port)
+		}
+	}
+	return net.Destination{}
+}
+
+func ReadUDPMsg(conn *net.UDPConn, payload []byte, oob []byte) (int, int, int, *net.UDPAddr, error) {
+	return conn.ReadMsgUDP(payload, oob)
+}