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129 lines
2.9 KiB
129 lines
2.9 KiB
// Copyright 2023 The frp Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package nathole
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import (
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"fmt"
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"net"
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"strconv"
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"github.com/samber/lo"
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)
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const (
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EasyNAT = "EasyNAT"
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HardNAT = "HardNAT"
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BehaviorNoChange = "BehaviorNoChange"
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BehaviorIPChanged = "BehaviorIPChanged"
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BehaviorPortChanged = "BehaviorPortChanged"
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BehaviorBothChanged = "BehaviorBothChanged"
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)
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type NatFeature struct {
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NatType string
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Behavior string
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PortsDifference int
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RegularPortsChange bool
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PublicNetwork bool
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}
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func ClassifyNATFeature(addresses []string, localIPs []string) (*NatFeature, error) {
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if len(addresses) <= 1 {
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return nil, fmt.Errorf("not enough addresses")
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}
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natFeature := &NatFeature{}
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ipChanged := false
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portChanged := false
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var baseIP, basePort string
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var portMax, portMin int
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for _, addr := range addresses {
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ip, port, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, err
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}
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portNum, err := strconv.Atoi(port)
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if err != nil {
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return nil, err
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}
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if lo.Contains(localIPs, ip) {
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natFeature.PublicNetwork = true
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}
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if baseIP == "" {
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baseIP = ip
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basePort = port
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portMax = portNum
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portMin = portNum
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continue
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}
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if portNum > portMax {
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portMax = portNum
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}
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if portNum < portMin {
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portMin = portNum
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}
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if baseIP != ip {
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ipChanged = true
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}
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if basePort != port {
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portChanged = true
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}
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}
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switch {
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case ipChanged && portChanged:
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natFeature.NatType = HardNAT
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natFeature.Behavior = BehaviorBothChanged
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case ipChanged:
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natFeature.NatType = HardNAT
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natFeature.Behavior = BehaviorIPChanged
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case portChanged:
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natFeature.NatType = HardNAT
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natFeature.Behavior = BehaviorPortChanged
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default:
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natFeature.NatType = EasyNAT
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natFeature.Behavior = BehaviorNoChange
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}
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if natFeature.Behavior == BehaviorPortChanged {
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natFeature.PortsDifference = portMax - portMin
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if natFeature.PortsDifference <= 5 && natFeature.PortsDifference >= 1 {
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natFeature.RegularPortsChange = true
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}
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}
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return natFeature, nil
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}
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func ClassifyFeatureCount(features []*NatFeature) (int, int, int) {
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easyCount := 0
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hardCount := 0
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// for HardNAT
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portsChangedRegularCount := 0
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for _, feature := range features {
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if feature.NatType == EasyNAT {
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easyCount++
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continue
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}
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hardCount++
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if feature.RegularPortsChange {
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portsChangedRegularCount++
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}
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}
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return easyCount, hardCount, portsChangedRegularCount
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}
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