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35 lines
931 B
35 lines
931 B
//go:build linux
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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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"github.com/xtls/xray-core/common/net"
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"golang.org/x/sys/unix"
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)
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func RetrieveOriginalDest(oob []byte) net.Destination {
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msgs, err := syscall.ParseSocketControlMessage(oob)
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if err != nil {
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return net.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_RECVORIGDSTADDR {
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ip := net.IPAddress(msg.Data[4:8])
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port := net.PortFromBytes(msg.Data[2:4])
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return net.UDPDestination(ip, port)
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} else if msg.Header.Level == syscall.SOL_IPV6 && msg.Header.Type == unix.IPV6_RECVORIGDSTADDR {
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ip := net.IPAddress(msg.Data[8:24])
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port := net.PortFromBytes(msg.Data[2:4])
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return net.UDPDestination(ip, port)
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}
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}
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return net.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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