Xray-core/transport/internet/udp/hub_linux.go

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// +build linux
package udp
import (
"syscall"
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"github.com/xtls/xray-core/common/net"
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"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)
}