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40 lines
961 B
40 lines
961 B
// +build linux
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package udp
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import (
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"net"
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"syscall"
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v2net "v2ray.com/core/common/net"
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)
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func SetOriginalDestOptions(fd int) error {
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if err := syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
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return err
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}
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if err := syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1); err != nil {
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return err
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}
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return nil
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}
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func RetrieveOriginalDest(oob []byte) v2net.Destination {
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msgs, err := syscall.ParseSocketControlMessage(oob)
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if err != nil {
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return v2net.Destination{}
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}
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for _, msg := range msgs {
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if msg.Header.Level == syscall.SOL_IP && msg.Header.Type == syscall.IP_ORIGDSTADDR {
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ip := v2net.IPAddress(msg.Data[4:8])
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port := v2net.PortFromBytes(msg.Data[2:4])
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return v2net.UDPDestination(ip, port)
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}
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}
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return v2net.Destination{}
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}
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func ReadUDPMsg(conn *net.UDPConn, payload []byte, oob []byte) (int, int, int, *net.UDPAddr, error) {
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return conn.ReadMsgUDP(payload, oob)
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}
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