mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-02 09:17:55 -04:00
35 lines
792 B
Go
35 lines
792 B
Go
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// +build linux
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package udp
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import (
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"syscall"
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v2net "github.com/v2ray/v2ray-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 nil
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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 nil
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}
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