frp/pkg/nathole/analysis.go

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// Copyright 2023 The frp Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package nathole
import (
"sync"
"time"
"github.com/samber/lo"
)
var (
// mode 0, both EasyNAT, PublicNetwork is always receiver
// sender | receiver, ttl 7
// receiver, ttl 7 | sender
// sender | receiver, ttl 4
// receiver, ttl 4 | sender
// sender | receiver
// receiver | sender
// sender, sendDelayMs 5000 | receiver
// sender, sendDelayMs 10000 | receiver
// receiver | sender, sendDelayMs 5000
// receiver | sender, sendDelayMs 10000
mode0Behaviors = []lo.Tuple2[RecommandBehavior, RecommandBehavior]{
lo.T2(RecommandBehavior{Role: DetectRoleSender}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 7}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver, TTL: 7}, RecommandBehavior{Role: DetectRoleSender}),
lo.T2(RecommandBehavior{Role: DetectRoleSender}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 4}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver, TTL: 4}, RecommandBehavior{Role: DetectRoleSender}),
lo.T2(RecommandBehavior{Role: DetectRoleSender}, RecommandBehavior{Role: DetectRoleReceiver}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver}, RecommandBehavior{Role: DetectRoleSender}),
lo.T2(RecommandBehavior{Role: DetectRoleSender, SendDelayMs: 5000}, RecommandBehavior{Role: DetectRoleReceiver}),
lo.T2(RecommandBehavior{Role: DetectRoleSender, SendDelayMs: 10000}, RecommandBehavior{Role: DetectRoleReceiver}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver}, RecommandBehavior{Role: DetectRoleSender, SendDelayMs: 5000}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver}, RecommandBehavior{Role: DetectRoleSender, SendDelayMs: 10000}),
}
// mode 1, HardNAT is sender, EasyNAT is receiver, port changes is regular
// sender | receiver, ttl 7, portsRangeNumber max 10
// sender, sendDelayMs 2000 | receiver, ttl 7, portsRangeNumber max 10
// sender | receiver, ttl 4, portsRangeNumber max 10
// sender, sendDelayMs 2000 | receiver, ttl 4, portsRangeNumber max 10
// sender | receiver, portsRangeNumber max 10
// sender, sendDelayMs 2000 | receiver, portsRangeNumber max 10
mode1Behaviors = []lo.Tuple2[RecommandBehavior, RecommandBehavior]{
lo.T2(RecommandBehavior{Role: DetectRoleSender}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 7, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleSender, SendDelayMs: 2000}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 7, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleSender}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 4, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleSender, SendDelayMs: 2000}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 4, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleSender}, RecommandBehavior{Role: DetectRoleReceiver, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleSender, SendDelayMs: 2000}, RecommandBehavior{Role: DetectRoleReceiver, PortsRangeNumber: 10}),
}
// mode 2, HardNAT is receiver, EasyNAT is sender
// sender, portsRandomNumber 1000, sendDelayMs 2000 | receiver, listen 256 ports, ttl 7
// sender, portsRandomNumber 1000, sendDelayMs 2000 | receiver, listen 256 ports, ttl 4
// sender, portsRandomNumber 1000, sendDelayMs 2000 | receiver, listen 256 ports
mode2Behaviors = []lo.Tuple2[RecommandBehavior, RecommandBehavior]{
lo.T2(
RecommandBehavior{Role: DetectRoleSender, PortsRandomNumber: 1000, SendDelayMs: 2000},
RecommandBehavior{Role: DetectRoleReceiver, ListenRandomPorts: 256, TTL: 7},
),
lo.T2(
RecommandBehavior{Role: DetectRoleSender, PortsRandomNumber: 1000, SendDelayMs: 2000},
RecommandBehavior{Role: DetectRoleReceiver, ListenRandomPorts: 256, TTL: 4},
),
lo.T2(
RecommandBehavior{Role: DetectRoleSender, PortsRandomNumber: 1000, SendDelayMs: 2000},
RecommandBehavior{Role: DetectRoleReceiver, ListenRandomPorts: 256},
),
}
// mode 3, For HardNAT & HardNAT, both changes in the ports are regular
// sender, portsRangeNumber 10 | receiver, ttl 7, portsRangeNumber 10
// sender, portsRangeNumber 10 | receiver, ttl 4, portsRangeNumber 10
// sender, portsRangeNumber 10 | receiver, portsRangeNumber 10
// receiver, ttl 7, portsRangeNumber 10 | sender, portsRangeNumber 10
// receiver, ttl 4, portsRangeNumber 10 | sender, portsRangeNumber 10
// receiver, portsRangeNumber 10 | sender, portsRangeNumber 10
mode3Behaviors = []lo.Tuple2[RecommandBehavior, RecommandBehavior]{
lo.T2(RecommandBehavior{Role: DetectRoleSender, PortsRangeNumber: 10}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 7, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleSender, PortsRangeNumber: 10}, RecommandBehavior{Role: DetectRoleReceiver, TTL: 4, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleSender, PortsRangeNumber: 10}, RecommandBehavior{Role: DetectRoleReceiver, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver, TTL: 7, PortsRangeNumber: 10}, RecommandBehavior{Role: DetectRoleSender, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver, TTL: 4, PortsRangeNumber: 10}, RecommandBehavior{Role: DetectRoleSender, PortsRangeNumber: 10}),
lo.T2(RecommandBehavior{Role: DetectRoleReceiver, PortsRangeNumber: 10}, RecommandBehavior{Role: DetectRoleSender, PortsRangeNumber: 10}),
}
// mode 4, Regular ports changes are usually the sender.
// sender, portsRandomNumber 1000, sendDelayMs: 2000 | receiver, listen 256 ports, ttl 7, portsRangeNumber 10
// sender, portsRandomNumber 1000, sendDelayMs: 2000 | receiver, listen 256 ports, ttl 4, portsRangeNumber 10
// sender, portsRandomNumber 1000, SendDelayMs: 2000 | receiver, listen 256 ports, portsRangeNumber 10
mode4Behaviors = []lo.Tuple2[RecommandBehavior, RecommandBehavior]{
lo.T2(
RecommandBehavior{Role: DetectRoleSender, PortsRandomNumber: 1000, SendDelayMs: 2000},
RecommandBehavior{Role: DetectRoleReceiver, ListenRandomPorts: 256, TTL: 7, PortsRangeNumber: 10},
),
lo.T2(
RecommandBehavior{Role: DetectRoleSender, PortsRandomNumber: 1000, SendDelayMs: 2000},
RecommandBehavior{Role: DetectRoleReceiver, ListenRandomPorts: 256, TTL: 4, PortsRangeNumber: 10},
),
lo.T2(
RecommandBehavior{Role: DetectRoleSender, PortsRandomNumber: 1000, SendDelayMs: 2000},
RecommandBehavior{Role: DetectRoleReceiver, ListenRandomPorts: 256, PortsRangeNumber: 10},
),
}
)
func getBehaviorByMode(mode int) []lo.Tuple2[RecommandBehavior, RecommandBehavior] {
switch mode {
case 0:
return mode0Behaviors
case 1:
return mode1Behaviors
case 2:
return mode2Behaviors
case 3:
return mode3Behaviors
case 4:
return mode4Behaviors
}
// default
return mode0Behaviors
}
func getBehaviorByModeAndIndex(mode int, index int) (RecommandBehavior, RecommandBehavior) {
behaviors := getBehaviorByMode(mode)
if index >= len(behaviors) {
return RecommandBehavior{}, RecommandBehavior{}
}
return behaviors[index].A, behaviors[index].B
}
func getBehaviorScoresByMode(mode int, defaultScore int) []*BehaviorScore {
return getBehaviorScoresByMode2(mode, defaultScore, defaultScore)
}
func getBehaviorScoresByMode2(mode int, senderScore, receiverScore int) []*BehaviorScore {
behaviors := getBehaviorByMode(mode)
scores := make([]*BehaviorScore, 0, len(behaviors))
for i := 0; i < len(behaviors); i++ {
score := receiverScore
if behaviors[i].A.Role == DetectRoleSender {
score = senderScore
}
scores = append(scores, &BehaviorScore{Mode: mode, Index: i, Score: score})
}
return scores
}
type RecommandBehavior struct {
Role string
TTL int
SendDelayMs int
PortsRangeNumber int
PortsRandomNumber int
ListenRandomPorts int
}
type MakeHoleRecords struct {
mu sync.Mutex
scores []*BehaviorScore
LastUpdateTime time.Time
}
func NewMakeHoleRecords(c, v *NatFeature) *MakeHoleRecords {
scores := []*BehaviorScore{}
easyCount, hardCount, portsChangedRegularCount := ClassifyFeatureCount([]*NatFeature{c, v})
appendMode0 := func() {
switch {
case c.PublicNetwork:
scores = append(scores, getBehaviorScoresByMode2(DetectMode0, 0, 1)...)
case v.PublicNetwork:
scores = append(scores, getBehaviorScoresByMode2(DetectMode0, 1, 0)...)
default:
scores = append(scores, getBehaviorScoresByMode(DetectMode0, 0)...)
}
}
switch {
case easyCount == 2:
appendMode0()
case hardCount == 1 && portsChangedRegularCount == 1:
scores = append(scores, getBehaviorScoresByMode(DetectMode1, 0)...)
scores = append(scores, getBehaviorScoresByMode(DetectMode2, 0)...)
appendMode0()
case hardCount == 1 && portsChangedRegularCount == 0:
scores = append(scores, getBehaviorScoresByMode(DetectMode2, 0)...)
scores = append(scores, getBehaviorScoresByMode(DetectMode1, 0)...)
appendMode0()
case hardCount == 2 && portsChangedRegularCount == 2:
scores = append(scores, getBehaviorScoresByMode(DetectMode3, 0)...)
scores = append(scores, getBehaviorScoresByMode(DetectMode4, 0)...)
case hardCount == 2 && portsChangedRegularCount == 1:
scores = append(scores, getBehaviorScoresByMode(DetectMode4, 0)...)
default:
// hard to make hole, just trying it out.
scores = append(scores, getBehaviorScoresByMode(DetectMode0, 1)...)
scores = append(scores, getBehaviorScoresByMode(DetectMode1, 1)...)
scores = append(scores, getBehaviorScoresByMode(DetectMode3, 1)...)
}
return &MakeHoleRecords{scores: scores, LastUpdateTime: time.Now()}
}
func (mhr *MakeHoleRecords) ReportSuccess(mode int, index int) {
mhr.mu.Lock()
defer mhr.mu.Unlock()
mhr.LastUpdateTime = time.Now()
for i := range mhr.scores {
score := mhr.scores[i]
if score.Mode != mode || score.Index != index {
continue
}
score.Score += 2
score.Score = lo.Min([]int{score.Score, 10})
return
}
}
func (mhr *MakeHoleRecords) Recommand() (mode, index int) {
mhr.mu.Lock()
defer mhr.mu.Unlock()
maxScore := lo.MaxBy(mhr.scores, func(item, max *BehaviorScore) bool {
return item.Score > max.Score
})
if maxScore == nil {
return 0, 0
}
maxScore.Score--
mhr.LastUpdateTime = time.Now()
return maxScore.Mode, maxScore.Index
}
type BehaviorScore struct {
Mode int
Index int
// between -10 and 10
Score int
}
type Analyzer struct {
// key is client ip + visitor ip
records map[string]*MakeHoleRecords
dataReserveDuration time.Duration
mu sync.Mutex
}
func NewAnalyzer(dataReserveDuration time.Duration) *Analyzer {
return &Analyzer{
records: make(map[string]*MakeHoleRecords),
dataReserveDuration: dataReserveDuration,
}
}
func (a *Analyzer) GetRecommandBehaviors(key string, c, v *NatFeature) (mode, index int, _ RecommandBehavior, _ RecommandBehavior) {
a.mu.Lock()
records, ok := a.records[key]
if !ok {
records = NewMakeHoleRecords(c, v)
a.records[key] = records
}
a.mu.Unlock()
mode, index = records.Recommand()
cBehavior, vBehavior := getBehaviorByModeAndIndex(mode, index)
switch mode {
case DetectMode1:
// HardNAT is always the sender
if c.NatType == EasyNAT {
cBehavior, vBehavior = vBehavior, cBehavior
}
case DetectMode2:
// HardNAT is always the receiver
if c.NatType == HardNAT {
cBehavior, vBehavior = vBehavior, cBehavior
}
case DetectMode4:
// Regular ports changes is always the sender
if !c.RegularPortsChange {
cBehavior, vBehavior = vBehavior, cBehavior
}
}
return mode, index, cBehavior, vBehavior
}
func (a *Analyzer) ReportSuccess(key string, mode, index int) {
a.mu.Lock()
records, ok := a.records[key]
a.mu.Unlock()
if !ok {
return
}
records.ReportSuccess(mode, index)
}
func (a *Analyzer) Clean() (int, int) {
now := time.Now()
total := 0
count := 0
// cleanup 10w records may take 5ms
a.mu.Lock()
defer a.mu.Unlock()
total = len(a.records)
// clean up records that have not been used for a period of time.
for key, records := range a.records {
if now.Sub(records.LastUpdateTime) > a.dataReserveDuration {
delete(a.records, key)
count++
}
}
return count, total
}