func argsCheck() *tunnel.Options {
var options tunnel.Options
var rc4Key string
flag.StringVar(&options.Listen, "listen", ":8001", "host:port gotunnel listen on")
flag.StringVar(&options.Server, "server", "", "server address, empty if work as server")
flag.IntVar(&options.LogLevel, "log", 1, "larger value for detail log")
flag.IntVar(&options.TunnelCount, "tunnel_count", 1, "low level tunnel count")
flag.StringVar(&rc4Key, "rc4", "the answer to life, the universe and everything", "rc4 key, disable if no key")
//flag.IntVar(&options.Count, "count", 1, "underlayer tunnel count")
flag.Usage = usage
flag.Parse()
options.Capacity = 10240
options.RbufHw = 12
options.RbufLw = 2
options.PacketSize = 4096
options.RC4Key = []byte(rc4Key)
if len(options.RC4Key) > 256 {
fmt.Println("rc4 key at most 256 bytes")
os.Exit(1)
}
// will support multiple tunnel in future
options.Count = 1
if options.Count <= 0 || options.Count > 1024 {
fmt.Println("tunnel count must be in range [1, 1024]")
os.Exit(1)
}
if options.Server == "" {
args := flag.Args()
if len(args) < 1 {
usage()
} else {
options.ConfigFile = args[0]
}
}
return &options
}
