diff --git a/infra/conf/common.go b/infra/conf/common.go index 24664859..ccd36d3d 100644 --- a/infra/conf/common.go +++ b/infra/conf/common.go @@ -246,43 +246,76 @@ func (v *User) Build() *protocol.User { // Int32Range deserializes from "1-2" or 1, so can deserialize from both int and number. // Negative integers can be passed as sentinel values, but do not parse as ranges. +// Value will be exchanged if From > To, use .Left and .Right to get original value if need. type Int32Range struct { - From int32 - To int32 + Left int32 + Right int32 + From int32 + To int32 } func (v *Int32Range) UnmarshalJSON(data []byte) error { + defer v.ensureOrder() var str string var rawint int32 if err := json.Unmarshal(data, &str); err == nil { - // for number in string format like "114" or "-1" - if value, err := strconv.Atoi(str); err == nil { - v.From = int32(value) - v.To = int32(value) + left, right, err := ParseRangeString(str) + if err == nil { + v.Left, v.Right = int32(left), int32(right) return nil } - // for empty "", we treat it as 0 - if str == "" { - v.From = 0 - v.To = 0 - return nil - } - // for range value, like "114-514" - pair := strings.SplitN(str, "-", 2) - if len(pair) == 2 { - from, err := strconv.Atoi(pair[0]) - to, err2 := strconv.Atoi(pair[1]) - if err == nil && err2 == nil { - v.From = int32(from) - v.To = int32(to) - return nil - } - } } else if err := json.Unmarshal(data, &rawint); err == nil { - v.From = rawint - v.To = rawint + v.Left = rawint + v.Right = rawint return nil } return errors.New("Invalid integer range, expected either string of form \"1-2\" or plain integer.") } + +// ensureOrder() gives value to .From & .To and make sure .From < .To +func (r *Int32Range) ensureOrder() { + r.From, r.To = r.Left, r.Right + if r.From > r.To { + r.From, r.To = r.To, r.From + } +} + +// "-114-514" → ["-114","514"] +// "-1919--810" → ["-1919","-810"] +func splitFromSecondDash(s string) []string { + parts := strings.SplitN(s, "-", 3) + if len(parts) < 3 { + return []string{s} + } + return []string{parts[0] + "-" + parts[1], parts[2]} +} + +// Parse rang in string. Support negative number. +// eg: "114-514" "-114-514" "-1919--810" "114514" ""(return 0) +func ParseRangeString(str string) (int, int, error) { + // for number in string format like "114" or "-1" + if value, err := strconv.Atoi(str); err == nil { + return value, value, nil + } + // for empty "", we treat it as 0 + if str == "" { + return 0, 0, nil + } + // for range value, like "114-514" + var pair []string + // Process sth like "-114-514" "-1919--810" + if strings.HasPrefix(str, "-") { + pair = splitFromSecondDash(str) + } else { + pair = strings.SplitN(str, "-", 2) + } + if len(pair) == 2 { + left, err := strconv.Atoi(pair[0]) + right, err2 := strconv.Atoi(pair[1]) + if err == nil && err2 == nil { + return left, right, nil + } + } + return 0, 0, errors.New("invalid range string: ", str) +} diff --git a/infra/conf/freedom.go b/infra/conf/freedom.go index 653f8815..14c09cc2 100644 --- a/infra/conf/freedom.go +++ b/infra/conf/freedom.go @@ -3,7 +3,6 @@ package conf import ( "encoding/base64" "net" - "strconv" "strings" "github.com/xtls/xray-core/common/errors" @@ -24,9 +23,9 @@ type FreedomConfig struct { } type Fragment struct { - Packets string `json:"packets"` - Length string `json:"length"` - Interval string `json:"interval"` + Packets string `json:"packets"` + Length *Int32Range `json:"length"` + Interval *Int32Range `json:"interval"` } type Noise struct { @@ -67,7 +66,6 @@ func (c *FreedomConfig) Build() (proto.Message, error) { if c.Fragment != nil { config.Fragment = new(freedom.Fragment) - var err, err2 error switch strings.ToLower(c.Fragment.Packets) { case "tlshello": @@ -80,75 +78,34 @@ func (c *FreedomConfig) Build() (proto.Message, error) { config.Fragment.PacketsTo = 0 default: // TCP Segmentation (range) - packetsFromTo := strings.Split(c.Fragment.Packets, "-") - if len(packetsFromTo) == 2 { - config.Fragment.PacketsFrom, err = strconv.ParseUint(packetsFromTo[0], 10, 64) - config.Fragment.PacketsTo, err2 = strconv.ParseUint(packetsFromTo[1], 10, 64) - } else { - config.Fragment.PacketsFrom, err = strconv.ParseUint(packetsFromTo[0], 10, 64) - config.Fragment.PacketsTo = config.Fragment.PacketsFrom - } + from, to, err := ParseRangeString(c.Fragment.Packets) if err != nil { return nil, errors.New("Invalid PacketsFrom").Base(err) } - if err2 != nil { - return nil, errors.New("Invalid PacketsTo").Base(err2) - } - if config.Fragment.PacketsFrom > config.Fragment.PacketsTo { - config.Fragment.PacketsFrom, config.Fragment.PacketsTo = config.Fragment.PacketsTo, config.Fragment.PacketsFrom - } + config.Fragment.PacketsFrom = uint64(from) + config.Fragment.PacketsTo = uint64(to) if config.Fragment.PacketsFrom == 0 { return nil, errors.New("PacketsFrom can't be 0") } } { - if c.Fragment.Length == "" { + if c.Fragment.Length == nil { return nil, errors.New("Length can't be empty") } - lengthMinMax := strings.Split(c.Fragment.Length, "-") - if len(lengthMinMax) == 2 { - config.Fragment.LengthMin, err = strconv.ParseUint(lengthMinMax[0], 10, 64) - config.Fragment.LengthMax, err2 = strconv.ParseUint(lengthMinMax[1], 10, 64) - } else { - config.Fragment.LengthMin, err = strconv.ParseUint(lengthMinMax[0], 10, 64) - config.Fragment.LengthMax = config.Fragment.LengthMin - } - if err != nil { - return nil, errors.New("Invalid LengthMin").Base(err) - } - if err2 != nil { - return nil, errors.New("Invalid LengthMax").Base(err2) - } - if config.Fragment.LengthMin > config.Fragment.LengthMax { - config.Fragment.LengthMin, config.Fragment.LengthMax = config.Fragment.LengthMax, config.Fragment.LengthMin - } + config.Fragment.LengthMin = uint64(c.Fragment.Length.From) + config.Fragment.LengthMax = uint64(c.Fragment.Length.To) if config.Fragment.LengthMin == 0 { return nil, errors.New("LengthMin can't be 0") } } { - if c.Fragment.Interval == "" { + if c.Fragment.Interval == nil { return nil, errors.New("Interval can't be empty") } - intervalMinMax := strings.Split(c.Fragment.Interval, "-") - if len(intervalMinMax) == 2 { - config.Fragment.IntervalMin, err = strconv.ParseUint(intervalMinMax[0], 10, 64) - config.Fragment.IntervalMax, err2 = strconv.ParseUint(intervalMinMax[1], 10, 64) - } else { - config.Fragment.IntervalMin, err = strconv.ParseUint(intervalMinMax[0], 10, 64) - config.Fragment.IntervalMax = config.Fragment.IntervalMin - } - if err != nil { - return nil, errors.New("Invalid IntervalMin").Base(err) - } - if err2 != nil { - return nil, errors.New("Invalid IntervalMax").Base(err2) - } - if config.Fragment.IntervalMin > config.Fragment.IntervalMax { - config.Fragment.IntervalMin, config.Fragment.IntervalMax = config.Fragment.IntervalMax, config.Fragment.IntervalMin - } + config.Fragment.IntervalMin = uint64(c.Fragment.Interval.From) + config.Fragment.IntervalMax = uint64(c.Fragment.Interval.To) } } @@ -193,29 +150,17 @@ func (c *FreedomConfig) Build() (proto.Message, error) { } func ParseNoise(noise *Noise) (*freedom.Noise, error) { - var err, err2 error + var err error NConfig := new(freedom.Noise) switch strings.ToLower(noise.Type) { case "rand": - randValue := strings.Split(noise.Packet, "-") - if len(randValue) > 2 { - return nil, errors.New("Only 2 values are allowed for rand") - } - if len(randValue) == 2 { - NConfig.LengthMin, err = strconv.ParseUint(randValue[0], 10, 64) - NConfig.LengthMax, err2 = strconv.ParseUint(randValue[1], 10, 64) - } - if len(randValue) == 1 { - NConfig.LengthMin, err = strconv.ParseUint(randValue[0], 10, 64) - NConfig.LengthMax = NConfig.LengthMin - } + min, max, err := ParseRangeString(noise.Packet) if err != nil { - return nil, errors.New("invalid value for rand LengthMin").Base(err) - } - if err2 != nil { - return nil, errors.New("invalid value for rand LengthMax").Base(err2) + return nil, errors.New("invalid value for rand Length").Base(err) } + NConfig.LengthMin = uint64(min) + NConfig.LengthMax = uint64(max) if NConfig.LengthMin > NConfig.LengthMax { NConfig.LengthMin, NConfig.LengthMax = NConfig.LengthMax, NConfig.LengthMin }