mirror of
https://github.com/xvzc/SpoofDPI.git
synced 2024-12-22 06:15:51 +00:00
123 lines
3.0 KiB
Go
123 lines
3.0 KiB
Go
package util
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import (
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"errors"
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"flag"
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"fmt"
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"strconv"
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"unsafe"
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)
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type Args struct {
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Addr string
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Port uint16
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DnsAddr string
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DnsPort uint16
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DnsIPv4Only bool
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EnableDoh bool
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Debug bool
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Silent bool
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SystemProxy bool
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Timeout uint16
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AllowedPattern StringArray
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WindowSize uint16
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Version bool
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}
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type StringArray []string
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func (arr *StringArray) String() string {
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return fmt.Sprintf("%s", *arr)
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}
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func (arr *StringArray) Set(value string) error {
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*arr = append(*arr, value)
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return nil
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}
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func ParseArgs() *Args {
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args := new(Args)
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flag.StringVar(&args.Addr, "addr", "127.0.0.1", "listen address")
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uintNVar(&args.Port, "port", 8080, "port")
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flag.StringVar(&args.DnsAddr, "dns-addr", "8.8.8.8", "dns address")
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uintNVar(&args.DnsPort, "dns-port", 53, "port number for dns")
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flag.BoolVar(&args.EnableDoh, "enable-doh", false, "enable 'dns-over-https'")
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flag.BoolVar(&args.Debug, "debug", false, "enable debug output")
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flag.BoolVar(&args.Silent, "silent", false, "do not show the banner and server information at start up")
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flag.BoolVar(&args.SystemProxy, "system-proxy", true, "enable system-wide proxy")
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uintNVar(&args.Timeout, "timeout", 0, "timeout in milliseconds; no timeout when not given")
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uintNVar(&args.WindowSize, "window-size", 0, `chunk size, in number of bytes, for fragmented client hello,
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try lower values if the default value doesn't bypass the DPI;
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when not given, the client hello packet will be sent in two parts:
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fragmentation for the first data packet and the rest
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`)
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flag.BoolVar(&args.Version, "v", false, "print spoofdpi's version; this may contain some other relevant information")
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flag.Var(
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&args.AllowedPattern,
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"pattern",
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"bypass DPI only on packets matching this regex pattern; can be given multiple times",
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)
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flag.BoolVar(&args.DnsIPv4Only, "dns-ipv4-only", false, "resolve only version 4 addresses")
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flag.Parse()
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return args
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}
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var (
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errParse = errors.New("parse error")
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errRange = errors.New("value out of range")
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)
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type unsigned interface {
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~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
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}
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func uintNVar[T unsigned](p *T, name string, value T, usage string) {
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flag.CommandLine.Var(newUintNValue(value, p), name, usage)
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}
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type uintNValue[T unsigned] struct {
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val *T
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}
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func newUintNValue[T unsigned](val T, p *T) *uintNValue[T] {
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*p = val
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return &uintNValue[T]{val: p}
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}
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func (u *uintNValue[T]) Set(s string) error {
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size := int(unsafe.Sizeof(*u.val) * 8)
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v, err := strconv.ParseUint(s, 0, size)
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if err != nil {
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err = numError(err)
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}
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*u.val = T(v)
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return err
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}
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func (u *uintNValue[T]) Get() any {
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if u.val == nil {
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return T(0)
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}
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return *u.val
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}
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func (u *uintNValue[T]) String() string {
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if u.val == nil {
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return "0"
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}
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return strconv.FormatUint(uint64(*u.val), 10)
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}
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func numError(err error) error {
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if errors.Is(err, strconv.ErrSyntax) {
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return errParse
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}
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if errors.Is(err, strconv.ErrRange) {
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return errRange
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}
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return err
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}
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