// dial tcp with tcp fastopen
// 第一个包体积不要太大,需要小于一定数量,否则会被吃掉(正确性问题),
// 如果过大,此处会在连接时发送前一部分,连接后又发送一部分
func TfoDial(nextAddr string, data []byte) (conn net.Conn, err error) {
s, err := unix.Socket(unix.AF_INET, unix.SOCK_STREAM, 0)
if err != nil {
return nil, err
}
defer unix.Close(s)
sa, err := kmgUnix.IPv4TcpAddrToUnixSocksAddr(nextAddr)
if err != nil {
return nil, err
}
if len(data) <= tfoFirstSize {
err = unix.Sendto(s, data, unix.MSG_FASTOPEN, sa)
if err != nil {
return
}
} else {
err = unix.Sendto(s, data[:tfoFirstSize], unix.MSG_FASTOPEN, sa)
if err != nil {
return
}
}
f := os.NewFile(uintptr(s), "TFODial")
defer f.Close()
conn, err = net.FileConn(f)
if err != nil {
return
}
if len(data) > tfoFirstSize {
_, err = conn.Write(data[tfoFirstSize:])
if err != nil {
return nil, err
}
}
return conn, nil
}
//network is useless ,it will always use tcp4
func TfoListen(network string, listenAddr string) (listener net.Listener, err error) {
s, err := unix.Socket(unix.AF_INET, unix.SOCK_STREAM|unix.SOCK_NONBLOCK|unix.SOCK_CLOEXEC, 0)
if err != nil {
return nil, err
}
defer unix.Close(s)
err = unix.SetsockoptInt(s, unix.SOL_TCP, 23, 10)
if err != nil {
return nil, err
}
err = unix.SetsockoptInt(s, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
if err != nil {
return nil, err
}
sa, err := kmgUnix.IPv4TcpAddrToUnixSocksAddr(listenAddr)
if err != nil {
return nil, err
}
err = unix.Bind(s, sa)
if err != nil {
return nil, err
}
err = unix.Listen(s, 10)
if err != nil {
return nil, err
}
f := os.NewFile(uintptr(s), "TFOListen")
defer f.Close()
return net.FileListener(f)
}