mirror of https://github.com/XTLS/Xray-core
35 lines
931 B
Go
35 lines
931 B
Go
//go:build linux
|
|
// +build linux
|
|
|
|
package udp
|
|
|
|
import (
|
|
"syscall"
|
|
|
|
"github.com/xtls/xray-core/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)
|
|
}
|