mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-09-05 11:34:32 -04:00
35 lines
792 B
Go
35 lines
792 B
Go
// +build linux
|
|
|
|
package udp
|
|
|
|
import (
|
|
"syscall"
|
|
|
|
v2net "github.com/v2ray/v2ray-core/common/net"
|
|
)
|
|
|
|
func SetOriginalDestOptions(fd int) error {
|
|
if err := syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
|
|
return err
|
|
}
|
|
if err := syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func RetrieveOriginalDest(oob []byte) v2net.Destination {
|
|
msgs, err := syscall.ParseSocketControlMessage(oob)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
for _, msg := range msgs {
|
|
if msg.Header.Level == syscall.SOL_IP && msg.Header.Type == syscall.IP_ORIGDSTADDR {
|
|
ip := v2net.IPAddress(msg.Data[4:8])
|
|
port := v2net.PortFromBytes(msg.Data[2:4])
|
|
return v2net.UDPDestination(ip, port)
|
|
}
|
|
}
|
|
return nil
|
|
}
|