mirror of https://github.com/XTLS/Xray-core.git
68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
//go:build linux
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// +build linux
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package dokodemo
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import (
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"fmt"
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"net"
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"os"
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"syscall"
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"golang.org/x/sys/unix"
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)
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func FakeUDP(addr *net.UDPAddr, mark int) (net.PacketConn, error) {
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var af int
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var sockaddr syscall.Sockaddr
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if len(addr.IP) == 4 {
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af = syscall.AF_INET
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sockaddr = &syscall.SockaddrInet4{Port: addr.Port}
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copy(sockaddr.(*syscall.SockaddrInet4).Addr[:], addr.IP)
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} else {
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af = syscall.AF_INET6
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sockaddr = &syscall.SockaddrInet6{Port: addr.Port}
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copy(sockaddr.(*syscall.SockaddrInet6).Addr[:], addr.IP)
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}
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var fd int
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var err error
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if fd, err = syscall.Socket(af, syscall.SOCK_DGRAM, 0); err != nil {
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return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("socket open: %s", err)}
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}
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if mark != 0 {
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if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_MARK, mark); err != nil {
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syscall.Close(fd)
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return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option: SO_MARK: %s", err)}
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}
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}
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if err = syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
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syscall.Close(fd)
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return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option: IP_TRANSPARENT: %s", err)}
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}
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syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
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syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, unix.SO_REUSEPORT, 1)
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if err = syscall.Bind(fd, sockaddr); err != nil {
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syscall.Close(fd)
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return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("socket bind: %s", err)}
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}
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fdFile := os.NewFile(uintptr(fd), fmt.Sprintf("net-udp-fake-%s", addr.String()))
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defer fdFile.Close()
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packetConn, err := net.FilePacketConn(fdFile)
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if err != nil {
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syscall.Close(fd)
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return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("convert file descriptor to connection: %s", err)}
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}
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return packetConn, nil
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}
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