Try to optimize pipe performance

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.47.0 to 0.48.0.
- [Commits](https://github.com/golang/net/compare/v0.47.0...v0.48.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-version: 0.48.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/docker/Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /src
 COPY . .
 ARG TARGETOS
 ARG TARGETARCH
-RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
+RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -o xray -trimpath -buildvcs=false -gcflags="all=-l=4" -ldflags "-s -w -buildid=" ./main
 
 # Download geodat into a staging directory
 ADD https://raw.githubusercontent.com/Loyalsoldier/v2ray-rules-dat/release/geoip.dat /tmp/geodat/geoip.dat

.github/docker/Dockerfile.usa

@@ -6,7 +6,7 @@ WORKDIR /src
 COPY . .
 ARG TARGETOS
 ARG TARGETARCH
-RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
+RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -o xray -trimpath -buildvcs=false -gcflags="all=-l=4" -ldflags "-s -w -buildid=" ./main
 
 # Download geodat into a staging directory
 ADD https://raw.githubusercontent.com/Loyalsoldier/v2ray-rules-dat/release/geoip.dat /tmp/geodat/geoip.dat

.github/workflows/docker.yml

@@ -65,7 +65,7 @@ jobs:
           echo "LATEST=$LATEST" >>${GITHUB_ENV}
 
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3

.github/workflows/release-win7.yml

@@ -63,7 +63,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Show workflow information
         run: |
@@ -132,7 +132,7 @@ jobs:
           mv build_assets Xray-${{ env.ASSET_NAME }}
 
       - name: Upload files to Artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Xray-${{ env.ASSET_NAME }}
           path: |

.github/workflows/release.yml

@@ -153,7 +153,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up NDK
         if: matrix.goos == 'android'
@@ -238,7 +238,7 @@ jobs:
           mv build_assets Xray-${{ env.ASSET_NAME }}
 
       - name: Upload files to Artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Xray-${{ env.ASSET_NAME }}
           path: |

.github/workflows/test.yml

@@ -45,7 +45,7 @@ jobs:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Go
         uses: actions/setup-go@v6
         with:

README.md

@@ -4,12 +4,25 @@
 
 [README](https://github.com/XTLS/Xray-core#readme) is open, so feel free to submit your project [here](https://github.com/XTLS/Xray-core/pulls).
 
+## Sponsors
+
+[![Remnawave](https://github.com/user-attachments/assets/a22d34ae-01ee-441c-843a-85356748ed1e)](https://docs.rw)
+
+[![Happ](https://github.com/user-attachments/assets/14055dab-e8bb-48bd-89e8-962709e4098e)](https://happ.su)
+
+[**Sponsor Xray-core**](https://github.com/XTLS/Xray-core/issues/3668)
+
 ## Donation & NFTs
 
 ### [Collect a Project X NFT to support the development of Project X!](https://opensea.io/item/ethereum/0x5ee362866001613093361eb8569d59c4141b76d1/1)
 
 [<img alt="Project X NFT" width="150px" src="https://raw2.seadn.io/ethereum/0x5ee362866001613093361eb8569d59c4141b76d1/7fa9ce900fb39b44226348db330e32/8b7fa9ce900fb39b44226348db330e32.svg" />](https://opensea.io/item/ethereum/0x5ee362866001613093361eb8569d59c4141b76d1/1)
 
+- **TRX(Tron)/USDT/USDC: `TNrDh5VSfwd4RPrwsohr6poyNTfFefNYan`**
+- **TON: `UQApeV-u2gm43aC1uP76xAC1m6vCylstaN1gpfBmre_5IyTH`**
+- **BTC: `1JpqcziZZuqv3QQJhZGNGBVdCBrGgkL6cT`**
+- **XMR: `4ABHQZ3yJZkBnLoqiKvb3f8eqUnX4iMPb6wdant5ZLGQELctcerceSGEfJnoCk6nnyRZm73wrwSgvZ2WmjYLng6R7sR67nq`**
+- **SOL/USDT/USDC: `3x5NuXHzB5APG6vRinPZcsUv5ukWUY1tBGRSJiEJWtZa`**
 - **ETH/USDT/USDC: `0xDc3Fe44F0f25D13CACb1C4896CD0D321df3146Ee`**
 - **Project X NFT: https://opensea.io/item/ethereum/0x5ee362866001613093361eb8569d59c4141b76d1/1**
 - **VLESS NFT: https://opensea.io/collection/vless**
@@ -44,9 +57,9 @@
   - [teddysun/xray](https://hub.docker.com/r/teddysun/xray)
   - [wulabing/xray_docker](https://github.com/wulabing/xray_docker)
 - Web Panel - **WARNING: Please DO NOT USE plain HTTP panels like 3X-UI**, as they are believed to be bribed by Iran GFW for supporting plain HTTP by default and refused to change (https://github.com/XTLS/Xray-core/pull/3884#issuecomment-2439595331), which has already put many users' data security in danger in the past few years. **If you are already using 3X-UI, please switch to the following panels, which are verified to support HTTPS and SSH port forwarding only:**
+  - [Remnawave](https://github.com/remnawave/panel)
   - [X-Panel](https://github.com/xeefei/X-Panel)
   - [PasarGuard](https://github.com/PasarGuard/panel)
-  - [Remnawave](https://github.com/remnawave/panel)
   - [Marzban](https://github.com/Gozargah/Marzban)
   - [Xray-UI](https://github.com/qist/xray-ui)
   - [Hiddify](https://github.com/hiddify/Hiddify-Manager)
@@ -108,12 +121,14 @@
   - [OneXray](https://github.com/OneXray/OneXray)
   - [GoXRay](https://github.com/goxray/desktop)
   - [AnyPortal](https://github.com/AnyPortal/AnyPortal)
+  - [v2rayN](https://github.com/2dust/v2rayN)
 - Linux
   - [v2rayA](https://github.com/v2rayA/v2rayA)
   - [Furious](https://github.com/LorenEteval/Furious)
   - [GorzRay](https://github.com/ketetefid/GorzRay)
   - [GoXRay](https://github.com/goxray/desktop)
   - [AnyPortal](https://github.com/AnyPortal/AnyPortal)
+  - [v2rayN](https://github.com/2dust/v2rayN)
 
 ## Others that support VLESS, XTLS, REALITY, XUDP, PLUX...
 

app/dns/cache_controller.go

@@ -3,36 +3,55 @@ package dns
 import (
 	"context"
 	go_errors "errors"
+	"runtime"
+	"sync"
+	"time"
+
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/signal/pubsub"
 	"github.com/xtls/xray-core/common/task"
 	dns_feature "github.com/xtls/xray-core/features/dns"
+
 	"golang.org/x/net/dns/dnsmessage"
-	"sync"
-	"time"
+	"golang.org/x/sync/singleflight"
+)
+
+const (
+	minSizeForEmptyRebuild  = 512
+	shrinkAbsoluteThreshold = 10240
+	shrinkRatioThreshold    = 0.65
+	migrationBatchSize      = 4096
 )
 
 type CacheController struct {
+	name            string
+	disableCache    bool
+	serveStale      bool
+	serveExpiredTTL int32
+
+	ips      map[string]*record
+	dirtyips map[string]*record
+
 	sync.RWMutex
-	ips          map[string]*record
-	pub          *pubsub.Service
-	cacheCleanup *task.Periodic
-	name         string
-	disableCache bool
+	pub           *pubsub.Service
+	cacheCleanup  *task.Periodic
+	highWatermark int
+	requestGroup  singleflight.Group
 }
 
-func NewCacheController(name string, disableCache bool) *CacheController {
+func NewCacheController(name string, disableCache bool, serveStale bool, serveExpiredTTL uint32) *CacheController {
 	c := &CacheController{
-		name:         name,
-		disableCache: disableCache,
-		ips:          make(map[string]*record),
-		pub:          pubsub.NewService(),
+		name:            name,
+		disableCache:    disableCache,
+		serveStale:      serveStale,
+		serveExpiredTTL: -int32(serveExpiredTTL),
+		ips:             make(map[string]*record),
+		pub:             pubsub.NewService(),
 	}
 
 	c.cacheCleanup = &task.Periodic{
-		Interval: time.Minute,
+		Interval: 300 * time.Second,
 		Execute:  c.CacheCleanup,
 	}
 	return c
@@ -40,131 +59,263 @@ func NewCacheController(name string, disableCache bool) *CacheController {
 
 // CacheCleanup clears expired items from cache
 func (c *CacheController) CacheCleanup() error {
-	now := time.Now()
-	c.Lock()
-	defer c.Unlock()
-
-	if len(c.ips) == 0 {
-		return errors.New("nothing to do. stopping...")
+	expiredKeys, err := c.collectExpiredKeys()
+	if err != nil {
+		return err
 	}
-
-	for domain, record := range c.ips {
-		if record.A != nil && record.A.Expire.Before(now) {
-			record.A = nil
-		}
-		if record.AAAA != nil && record.AAAA.Expire.Before(now) {
-			record.AAAA = nil
-		}
-
-		if record.A == nil && record.AAAA == nil {
-			errors.LogDebug(context.Background(), c.name, "cache cleanup ", domain)
-			delete(c.ips, domain)
-		} else {
-			c.ips[domain] = record
-		}
+	if len(expiredKeys) == 0 {
+		return nil
 	}
-
-	if len(c.ips) == 0 {
-		c.ips = make(map[string]*record)
-	}
-
+	c.writeAndShrink(expiredKeys)
 	return nil
 }
 
-func (c *CacheController) updateIP(req *dnsRequest, ipRec *IPRecord) {
-	elapsed := time.Since(req.start)
+func (c *CacheController) collectExpiredKeys() ([]string, error) {
+	c.RLock()
+	defer c.RUnlock()
 
-	c.Lock()
-	rec, found := c.ips[req.domain]
-	if !found {
-		rec = &record{}
+	if len(c.ips) == 0 {
+		return nil, errors.New("nothing to do. stopping...")
 	}
 
-	switch req.reqType {
-	case dnsmessage.TypeA:
-		rec.A = ipRec
-	case dnsmessage.TypeAAAA:
-		rec.AAAA = ipRec
+	// skip collection if a migration is in progress
+	if c.dirtyips != nil {
+		return nil, nil
 	}
 
-	errors.LogInfo(context.Background(), c.name, " got answer: ", req.domain, " ", req.reqType, " -> ", ipRec.IP, " ", elapsed)
-	c.ips[req.domain] = rec
+	now := time.Now()
+	if c.serveStale && c.serveExpiredTTL != 0 {
+		now = now.Add(time.Duration(c.serveExpiredTTL) * time.Second)
+	}
 
-	switch req.reqType {
-	case dnsmessage.TypeA:
-		c.pub.Publish(req.domain+"4", nil)
-		if !c.disableCache {
-			_, _, err := rec.AAAA.getIPs()
-			if !go_errors.Is(err, errRecordNotFound) {
-				c.pub.Publish(req.domain+"6", nil)
-			}
-		}
-	case dnsmessage.TypeAAAA:
-		c.pub.Publish(req.domain+"6", nil)
-		if !c.disableCache {
-			_, _, err := rec.A.getIPs()
-			if !go_errors.Is(err, errRecordNotFound) {
-				c.pub.Publish(req.domain+"4", nil)
-			}
+	expiredKeys := make([]string, 0, len(c.ips)/4) // pre-allocate
+
+	for domain, rec := range c.ips {
+		if (rec.A != nil && rec.A.Expire.Before(now)) ||
+			(rec.AAAA != nil && rec.AAAA.Expire.Before(now)) {
+			expiredKeys = append(expiredKeys, domain)
 		}
 	}
 
-	c.Unlock()
-	common.Must(c.cacheCleanup.Start())
+	return expiredKeys, nil
 }
 
-func (c *CacheController) findIPsForDomain(domain string, option dns_feature.IPOption) ([]net.IP, uint32, error) {
+func (c *CacheController) writeAndShrink(expiredKeys []string) {
+	c.Lock()
+	defer c.Unlock()
+
+	// double check to prevent upper call multiple cleanup tasks
+	if c.dirtyips != nil {
+		return
+	}
+
+	lenBefore := len(c.ips)
+	if lenBefore > c.highWatermark {
+		c.highWatermark = lenBefore
+	}
+
+	now := time.Now()
+	if c.serveStale && c.serveExpiredTTL != 0 {
+		now = now.Add(time.Duration(c.serveExpiredTTL) * time.Second)
+	}
+
+	for _, domain := range expiredKeys {
+		rec := c.ips[domain]
+		if rec == nil {
+			continue
+		}
+		if rec.A != nil && rec.A.Expire.Before(now) {
+			rec.A = nil
+		}
+		if rec.AAAA != nil && rec.AAAA.Expire.Before(now) {
+			rec.AAAA = nil
+		}
+		if rec.A == nil && rec.AAAA == nil {
+			delete(c.ips, domain)
+		}
+	}
+
+	lenAfter := len(c.ips)
+
+	if lenAfter == 0 {
+		if c.highWatermark >= minSizeForEmptyRebuild {
+			errors.LogDebug(context.Background(), c.name,
+				" rebuilding empty cache map to reclaim memory.",
+				" size_before_cleanup=", lenBefore,
+				" peak_size_before_rebuild=", c.highWatermark,
+			)
+
+			c.ips = make(map[string]*record)
+			c.highWatermark = 0
+		}
+		return
+	}
+
+	if reductionFromPeak := c.highWatermark - lenAfter; reductionFromPeak > shrinkAbsoluteThreshold &&
+		float64(reductionFromPeak) > float64(c.highWatermark)*shrinkRatioThreshold {
+		errors.LogDebug(context.Background(), c.name,
+			" shrinking cache map to reclaim memory.",
+			" new_size=", lenAfter,
+			" peak_size_before_shrink=", c.highWatermark,
+			" reduction_since_peak=", reductionFromPeak,
+		)
+
+		c.dirtyips = c.ips
+		c.ips = make(map[string]*record, int(float64(lenAfter)*1.1))
+		c.highWatermark = lenAfter
+		go c.migrate()
+	}
+
+}
+
+type migrationEntry struct {
+	key   string
+	value *record
+}
+
+func (c *CacheController) migrate() {
+	defer func() {
+		if r := recover(); r != nil {
+			errors.LogError(context.Background(), c.name, " panic during cache migration: ", r)
+			c.Lock()
+			c.dirtyips = nil
+			// c.ips = make(map[string]*record)
+			// c.highWatermark = 0
+			c.Unlock()
+		}
+	}()
+
 	c.RLock()
-	record, found := c.ips[domain]
+	dirtyips := c.dirtyips
 	c.RUnlock()
 
-	if !found {
-		return nil, 0, errRecordNotFound
+	// double check to prevent upper call multiple cleanup tasks
+	if dirtyips == nil {
+		return
 	}
 
-	var errs []error
-	var allIPs []net.IP
-	var rTTL uint32 = dns_feature.DefaultTTL
+	errors.LogDebug(context.Background(), c.name, " starting background cache migration for ", len(dirtyips), " items")
 
-	mergeReq := option.IPv4Enable && option.IPv6Enable
+	batch := make([]migrationEntry, 0, migrationBatchSize)
+	for domain, recD := range dirtyips {
+		batch = append(batch, migrationEntry{domain, recD})
 
-	if option.IPv4Enable {
-		ips, ttl, err := record.A.getIPs()
-		if !mergeReq || go_errors.Is(err, errRecordNotFound) {
-			return ips, ttl, err
+		if len(batch) >= migrationBatchSize {
+			c.flush(batch)
+			batch = batch[:0]
+			runtime.Gosched()
 		}
-		if ttl < rTTL {
-			rTTL = ttl
-		}
-		if len(ips) > 0 {
-			allIPs = append(allIPs, ips...)
+	}
+	if len(batch) > 0 {
+		c.flush(batch)
+	}
+
+	c.Lock()
+	c.dirtyips = nil
+	c.Unlock()
+
+	errors.LogDebug(context.Background(), c.name, " cache migration completed")
+}
+
+func (c *CacheController) flush(batch []migrationEntry) {
+	c.Lock()
+	defer c.Unlock()
+
+	for _, dirty := range batch {
+		if cur := c.ips[dirty.key]; cur != nil {
+			merge := &record{}
+			if cur.A == nil {
+				merge.A = dirty.value.A
+			} else {
+				merge.A = cur.A
+			}
+			if cur.AAAA == nil {
+				merge.AAAA = dirty.value.AAAA
+			} else {
+				merge.AAAA = cur.AAAA
+			}
+			c.ips[dirty.key] = merge
 		} else {
-			errs = append(errs, err)
+			c.ips[dirty.key] = dirty.value
+		}
+	}
+}
+
+func (c *CacheController) updateRecord(req *dnsRequest, rep *IPRecord) {
+	rtt := time.Since(req.start)
+
+	switch req.reqType {
+	case dnsmessage.TypeA:
+		c.pub.Publish(req.domain+"4", rep)
+	case dnsmessage.TypeAAAA:
+		c.pub.Publish(req.domain+"6", rep)
+	}
+
+	if c.disableCache {
+		errors.LogInfo(context.Background(), c.name, " got answer: ", req.domain, " ", req.reqType, " -> ", rep.IP, ", rtt: ", rtt)
+		return
+	}
+
+	c.Lock()
+	lockWait := time.Since(req.start) - rtt
+
+	newRec := &record{}
+	oldRec := c.ips[req.domain]
+	var dirtyRec *record
+	if c.dirtyips != nil {
+		dirtyRec = c.dirtyips[req.domain]
+	}
+
+	var pubRecord *IPRecord
+	var pubSuffix string
+
+	switch req.reqType {
+	case dnsmessage.TypeA:
+		newRec.A = rep
+		if oldRec != nil && oldRec.AAAA != nil {
+			newRec.AAAA = oldRec.AAAA
+			pubRecord = oldRec.AAAA
+		} else if dirtyRec != nil && dirtyRec.AAAA != nil {
+			pubRecord = dirtyRec.AAAA
+		}
+		pubSuffix = "6"
+	case dnsmessage.TypeAAAA:
+		newRec.AAAA = rep
+		if oldRec != nil && oldRec.A != nil {
+			newRec.A = oldRec.A
+			pubRecord = oldRec.A
+		} else if dirtyRec != nil && dirtyRec.A != nil {
+			pubRecord = dirtyRec.A
+		}
+		pubSuffix = "4"
+	}
+
+	c.ips[req.domain] = newRec
+	c.Unlock()
+
+	if pubRecord != nil {
+		_, ttl, err := pubRecord.getIPs()
+		if ttl > 0 && !go_errors.Is(err, errRecordNotFound) {
+			c.pub.Publish(req.domain+pubSuffix, pubRecord)
 		}
 	}
 
-	if option.IPv6Enable {
-		ips, ttl, err := record.AAAA.getIPs()
-		if !mergeReq || go_errors.Is(err, errRecordNotFound) {
-			return ips, ttl, err
-		}
-		if ttl < rTTL {
-			rTTL = ttl
-		}
-		if len(ips) > 0 {
-			allIPs = append(allIPs, ips...)
-		} else {
-			errs = append(errs, err)
-		}
-	}
+	errors.LogInfo(context.Background(), c.name, " got answer: ", req.domain, " ", req.reqType, " -> ", rep.IP, ", rtt: ", rtt, ", lock: ", lockWait)
 
-	if len(allIPs) > 0 {
-		return allIPs, rTTL, nil
+	if !c.serveStale || c.serveExpiredTTL != 0 {
+		common.Must(c.cacheCleanup.Start())
 	}
-	if go_errors.Is(errs[0], errs[1]) {
-		return nil, rTTL, errs[0]
+}
+
+func (c *CacheController) findRecords(domain string) *record {
+	c.RLock()
+	defer c.RUnlock()
+
+	rec := c.ips[domain]
+	if rec == nil && c.dirtyips != nil {
+		rec = c.dirtyips[domain]
 	}
-	return nil, rTTL, errors.Combine(errs...)
+	return rec
 }
 
 func (c *CacheController) registerSubscribers(domain string, option dns_feature.IPOption) (sub4 *pubsub.Subscriber, sub6 *pubsub.Subscriber) {

app/dns/config.pb.go

@@ -141,10 +141,13 @@ type NameServer struct {
 	ActPrior          bool                         `protobuf:"varint,8,opt,name=actPrior,proto3" json:"actPrior,omitempty"`
 	Tag               string                       `protobuf:"bytes,9,opt,name=tag,proto3" json:"tag,omitempty"`
 	TimeoutMs         uint64                       `protobuf:"varint,10,opt,name=timeoutMs,proto3" json:"timeoutMs,omitempty"`
-	DisableCache      bool                         `protobuf:"varint,11,opt,name=disableCache,proto3" json:"disableCache,omitempty"`
+	DisableCache      *bool                        `protobuf:"varint,11,opt,name=disableCache,proto3,oneof" json:"disableCache,omitempty"`
+	ServeStale        *bool                        `protobuf:"varint,15,opt,name=serveStale,proto3,oneof" json:"serveStale,omitempty"`
+	ServeExpiredTTL   *uint32                      `protobuf:"varint,16,opt,name=serveExpiredTTL,proto3,oneof" json:"serveExpiredTTL,omitempty"`
 	FinalQuery        bool                         `protobuf:"varint,12,opt,name=finalQuery,proto3" json:"finalQuery,omitempty"`
 	UnexpectedGeoip   []*router.GeoIP              `protobuf:"bytes,13,rep,name=unexpected_geoip,json=unexpectedGeoip,proto3" json:"unexpected_geoip,omitempty"`
 	ActUnprior        bool                         `protobuf:"varint,14,opt,name=actUnprior,proto3" json:"actUnprior,omitempty"`
+	PolicyID          uint32                       `protobuf:"varint,17,opt,name=policyID,proto3" json:"policyID,omitempty"`
 }
 
 func (x *NameServer) Reset() {
@@ -248,12 +251,26 @@ func (x *NameServer) GetTimeoutMs() uint64 {
 }
 
 func (x *NameServer) GetDisableCache() bool {
-	if x != nil {
-		return x.DisableCache
+	if x != nil && x.DisableCache != nil {
+		return *x.DisableCache
 	}
 	return false
 }
 
+func (x *NameServer) GetServeStale() bool {
+	if x != nil && x.ServeStale != nil {
+		return *x.ServeStale
+	}
+	return false
+}
+
+func (x *NameServer) GetServeExpiredTTL() uint32 {
+	if x != nil && x.ServeExpiredTTL != nil {
+		return *x.ServeExpiredTTL
+	}
+	return 0
+}
+
 func (x *NameServer) GetFinalQuery() bool {
 	if x != nil {
 		return x.FinalQuery
@@ -275,6 +292,13 @@ func (x *NameServer) GetActUnprior() bool {
 	return false
 }
 
+func (x *NameServer) GetPolicyID() uint32 {
+	if x != nil {
+		return x.PolicyID
+	}
+	return 0
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -291,9 +315,12 @@ type Config struct {
 	Tag string `protobuf:"bytes,6,opt,name=tag,proto3" json:"tag,omitempty"`
 	// DisableCache disables DNS cache
 	DisableCache           bool          `protobuf:"varint,8,opt,name=disableCache,proto3" json:"disableCache,omitempty"`
+	ServeStale             bool          `protobuf:"varint,12,opt,name=serveStale,proto3" json:"serveStale,omitempty"`
+	ServeExpiredTTL        uint32        `protobuf:"varint,13,opt,name=serveExpiredTTL,proto3" json:"serveExpiredTTL,omitempty"`
 	QueryStrategy          QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
 	DisableFallback        bool          `protobuf:"varint,10,opt,name=disableFallback,proto3" json:"disableFallback,omitempty"`
 	DisableFallbackIfMatch bool          `protobuf:"varint,11,opt,name=disableFallbackIfMatch,proto3" json:"disableFallbackIfMatch,omitempty"`
+	EnableParallelQuery    bool          `protobuf:"varint,14,opt,name=enableParallelQuery,proto3" json:"enableParallelQuery,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -361,6 +388,20 @@ func (x *Config) GetDisableCache() bool {
 	return false
 }
 
+func (x *Config) GetServeStale() bool {
+	if x != nil {
+		return x.ServeStale
+	}
+	return false
+}
+
+func (x *Config) GetServeExpiredTTL() uint32 {
+	if x != nil {
+		return x.ServeExpiredTTL
+	}
+	return 0
+}
+
 func (x *Config) GetQueryStrategy() QueryStrategy {
 	if x != nil {
 		return x.QueryStrategy
@@ -382,6 +423,13 @@ func (x *Config) GetDisableFallbackIfMatch() bool {
 	return false
 }
 
+func (x *Config) GetEnableParallelQuery() bool {
+	if x != nil {
+		return x.EnableParallelQuery
+	}
+	return false
+}
+
 type NameServer_PriorityDomain struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -567,7 +615,7 @@ var file_app_dns_config_proto_rawDesc = []byte{
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@@ -599,74 +647,93 @@ var file_app_dns_config_proto_rawDesc = []byte{
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+	0x72, 0x61, 0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x44, 0x6e, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -718,6 +785,7 @@ func file_app_dns_config_proto_init() {
 	if File_app_dns_config_proto != nil {
 		return
 	}
+	file_app_dns_config_proto_msgTypes[0].OneofWrappers = []any{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{

app/dns/config.proto

@@ -31,10 +31,13 @@ message NameServer {
   bool actPrior = 8;
   string tag = 9;
   uint64 timeoutMs = 10;
-  bool disableCache = 11;
+  optional bool disableCache = 11;
+  optional bool serveStale = 15;
+  optional uint32 serveExpiredTTL = 16;
   bool finalQuery = 12;
   repeated xray.app.router.GeoIP unexpected_geoip = 13;
   bool actUnprior = 14;
+  uint32 policyID = 17;
 }
 
 enum DomainMatchingType {
@@ -80,9 +83,13 @@ message Config {
 
   // DisableCache disables DNS cache
   bool disableCache = 8;
+  bool serveStale = 12;
+  uint32 serveExpiredTTL = 13;
 
   QueryStrategy query_strategy = 9;
 
   bool disableFallback = 10;
   bool disableFallbackIfMatch = 11;
+
+  bool enableParallelQuery = 14;
 }

app/dns/dns.go

@@ -5,9 +5,12 @@ import (
 	"context"
 	go_errors "errors"
 	"fmt"
+	"os"
+	"runtime"
 	"sort"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
@@ -22,6 +25,7 @@ type DNS struct {
 	sync.Mutex
 	disableFallback        bool
 	disableFallbackIfMatch bool
+	enableParallelQuery    bool
 	ipOption               *dns.IPOption
 	hosts                  *StaticHosts
 	clients                []*Client
@@ -117,7 +121,20 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
 			myClientIP = net.IP(ns.ClientIp)
 		}
 
-		disableCache := config.DisableCache || ns.DisableCache
+		disableCache := config.DisableCache
+		if ns.DisableCache != nil {
+			disableCache = *ns.DisableCache
+		}
+
+		serveStale := config.ServeStale
+		if ns.ServeStale != nil {
+			serveStale = *ns.ServeStale
+		}
+
+		serveExpiredTTL := config.ServeExpiredTTL
+		if ns.ServeExpiredTTL != nil {
+			serveExpiredTTL = *ns.ServeExpiredTTL
+		}
 
 		var tag = defaultTag
 		if len(ns.Tag) > 0 {
@@ -128,7 +145,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
 			return nil, errors.New("no QueryStrategy available for ", ns.Address)
 		}
 
-		client, err := NewClient(ctx, ns, myClientIP, disableCache, tag, clientIPOption, &matcherInfos, updateDomain)
+		client, err := NewClient(ctx, ns, myClientIP, disableCache, serveStale, serveExpiredTTL, tag, clientIPOption, &matcherInfos, updateDomain)
 		if err != nil {
 			return nil, errors.New("failed to create client").Base(err)
 		}
@@ -149,6 +166,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
 		matcherInfos:           matcherInfos,
 		disableFallback:        config.DisableFallback,
 		disableFallbackIfMatch: config.DisableFallbackIfMatch,
+		enableParallelQuery:    config.EnableParallelQuery,
 		checkSystem:            checkSystem,
 	}, nil
 }
@@ -191,7 +209,7 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, uint32, er
 	}
 
 	if s.checkSystem {
-		supportIPv4, supportIPv6 := checkSystemNetwork()
+		supportIPv4, supportIPv6 := checkRoutes()
 		option.IPv4Enable = option.IPv4Enable && supportIPv4
 		option.IPv6Enable = option.IPv6Enable && supportIPv6
 	} else {
@@ -227,45 +245,11 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, uint32, er
 	}
 
 	// Name servers lookup
-	var errs []error
-	for _, client := range s.sortClients(domain) {
-		if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
-			errors.LogDebug(s.ctx, "skip DNS resolution for domain ", domain, " at server ", client.Name())
-			continue
-		}
-
-		ips, ttl, err := client.QueryIP(s.ctx, domain, option)
-
-		if len(ips) > 0 {
-			if ttl == 0 {
-				ttl = 1
-			}
-			return ips, ttl, nil
-		}
-
-		errors.LogInfoInner(s.ctx, err, "failed to lookup ip for domain ", domain, " at server ", client.Name())
-		if err == nil {
-			err = dns.ErrEmptyResponse
-		}
-		errs = append(errs, err)
-
-		if client.IsFinalQuery() {
-			break
-		}
+	if s.enableParallelQuery {
+		return s.parallelQuery(domain, option)
+	} else {
+		return s.serialQuery(domain, option)
 	}
-
-	if len(errs) > 0 {
-		allErrs := errors.Combine(errs...)
-		err0 := errs[0]
-		if errors.AllEqual(err0, allErrs) {
-			if go_errors.Is(err0, dns.ErrEmptyResponse) {
-				return nil, 0, dns.ErrEmptyResponse
-			}
-			return nil, 0, errors.New("returning nil for domain ", domain).Base(err0)
-		}
-		return nil, 0, errors.New("returning nil for domain ", domain).Base(allErrs)
-	}
-	return nil, 0, dns.ErrEmptyResponse
 }
 
 func (s *DNS) sortClients(domain string) []*Client {
@@ -292,6 +276,9 @@ func (s *DNS) sortClients(domain string) []*Client {
 		clients = append(clients, client)
 		clientNames = append(clientNames, client.Name())
 		hasMatch = true
+		if client.finalQuery {
+			return clients
+		}
 	}
 
 	if !(s.disableFallback || s.disableFallbackIfMatch && hasMatch) {
@@ -303,6 +290,9 @@ func (s *DNS) sortClients(domain string) []*Client {
 			clientUsed[idx] = true
 			clients = append(clients, client)
 			clientNames = append(clientNames, client.Name())
+			if client.finalQuery {
+				return clients
+			}
 		}
 	}
 
@@ -314,35 +304,280 @@ func (s *DNS) sortClients(domain string) []*Client {
 	}
 
 	if len(clients) == 0 {
-		clients = append(clients, s.clients[0])
-		clientNames = append(clientNames, s.clients[0].Name())
-		errors.LogDebug(s.ctx, "domain ", domain, " will use the first DNS: ", clientNames)
+		if len(s.clients) > 0 {
+			clients = append(clients, s.clients[0])
+			clientNames = append(clientNames, s.clients[0].Name())
+			errors.LogWarning(s.ctx, "domain ", domain, " will use the first DNS: ", clientNames)
+		} else {
+			errors.LogError(s.ctx, "no DNS clients available for domain ", domain, " and no default clients configured")
+		}
 	}
 
 	return clients
 }
 
+func mergeQueryErrors(domain string, errs []error) error {
+	if len(errs) == 0 {
+		return dns.ErrEmptyResponse
+	}
+
+	var noRNF error
+	for _, err := range errs {
+		if go_errors.Is(err, errRecordNotFound) {
+			continue // server no response, ignore
+		} else if noRNF == nil {
+			noRNF = err
+		} else if !go_errors.Is(err, noRNF) {
+			return errors.New("returning nil for domain ", domain).Base(errors.Combine(errs...))
+		}
+	}
+	if go_errors.Is(noRNF, dns.ErrEmptyResponse) {
+		return dns.ErrEmptyResponse
+	}
+	if noRNF == nil {
+		noRNF = errRecordNotFound
+	}
+	return errors.New("returning nil for domain ", domain).Base(noRNF)
+}
+
+func (s *DNS) serialQuery(domain string, option dns.IPOption) ([]net.IP, uint32, error) {
+	var errs []error
+	for _, client := range s.sortClients(domain) {
+		if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
+			errors.LogDebug(s.ctx, "skip DNS resolution for domain ", domain, " at server ", client.Name())
+			continue
+		}
+
+		ips, ttl, err := client.QueryIP(s.ctx, domain, option)
+
+		if len(ips) > 0 {
+			return ips, ttl, nil
+		}
+
+		errors.LogInfoInner(s.ctx, err, "failed to lookup ip for domain ", domain, " at server ", client.Name(), " in serial query mode")
+		if err == nil {
+			err = dns.ErrEmptyResponse
+		}
+		errs = append(errs, err)
+	}
+	return nil, 0, mergeQueryErrors(domain, errs)
+}
+
+func (s *DNS) parallelQuery(domain string, option dns.IPOption) ([]net.IP, uint32, error) {
+	var errs []error
+	clients := s.sortClients(domain)
+
+	resultsChan := asyncQueryAll(domain, option, clients, s.ctx)
+
+	groups, groupOf := makeGroups( /*s.ctx,*/ clients)
+	results := make([]*queryResult, len(clients))
+	pending := make([]int, len(groups))
+	for gi, g := range groups {
+		pending[gi] = g.end - g.start + 1
+	}
+
+	nextGroup := 0
+	for range clients {
+		result := <-resultsChan
+		results[result.index] = &result
+
+		gi := groupOf[result.index]
+		pending[gi]--
+
+		for nextGroup < len(groups) {
+			g := groups[nextGroup]
+
+			// group race, minimum rtt -> return
+			for j := g.start; j <= g.end; j++ {
+				r := results[j]
+				if r != nil && r.err == nil && len(r.ips) > 0 {
+					return r.ips, r.ttl, nil
+				}
+			}
+
+			// current group is incomplete and no one success -> continue pending
+			if pending[nextGroup] > 0 {
+				break
+			}
+
+			// all failed -> log and continue next group
+			for j := g.start; j <= g.end; j++ {
+				r := results[j]
+				e := r.err
+				if e == nil {
+					e = dns.ErrEmptyResponse
+				}
+				errors.LogInfoInner(s.ctx, e, "failed to lookup ip for domain ", domain, " at server ", clients[j].Name(), " in parallel query mode")
+				errs = append(errs, e)
+			}
+			nextGroup++
+		}
+	}
+
+	return nil, 0, mergeQueryErrors(domain, errs)
+}
+
+type queryResult struct {
+	ips   []net.IP
+	ttl   uint32
+	err   error
+	index int
+}
+
+func asyncQueryAll(domain string, option dns.IPOption, clients []*Client, ctx context.Context) chan queryResult {
+	if len(clients) == 0 {
+		ch := make(chan queryResult)
+		close(ch)
+		return ch
+	}
+
+	ch := make(chan queryResult, len(clients))
+	for i, client := range clients {
+		if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
+			errors.LogDebug(ctx, "skip DNS resolution for domain ", domain, " at server ", client.Name())
+			ch <- queryResult{err: dns.ErrEmptyResponse, index: i}
+			continue
+		}
+
+		go func(i int, c *Client) {
+			qctx := ctx
+			if !c.server.IsDisableCache() {
+				nctx, cancel := context.WithTimeout(context.WithoutCancel(ctx), c.timeoutMs*2)
+				qctx = nctx
+				defer cancel()
+			}
+			ips, ttl, err := c.QueryIP(qctx, domain, option)
+			ch <- queryResult{ips: ips, ttl: ttl, err: err, index: i}
+		}(i, client)
+	}
+	return ch
+}
+
+type group struct{ start, end int }
+
+// merge only adjacent and rule-equivalent Client into a single group
+func makeGroups( /*ctx context.Context,*/ clients []*Client) ([]group, []int) {
+	n := len(clients)
+	if n == 0 {
+		return nil, nil
+	}
+	groups := make([]group, 0, n)
+	groupOf := make([]int, n)
+
+	s, e := 0, 0
+	for i := 1; i < n; i++ {
+		if clients[i-1].policyID == clients[i].policyID {
+			e = i
+		} else {
+			for k := s; k <= e; k++ {
+				groupOf[k] = len(groups)
+			}
+			groups = append(groups, group{start: s, end: e})
+			s, e = i, i
+		}
+	}
+	for k := s; k <= e; k++ {
+		groupOf[k] = len(groups)
+	}
+	groups = append(groups, group{start: s, end: e})
+
+	// var b strings.Builder
+	// b.WriteString("dns grouping: total clients=")
+	// b.WriteString(strconv.Itoa(n))
+	// b.WriteString(", groups=")
+	// b.WriteString(strconv.Itoa(len(groups)))
+
+	// for gi, g := range groups {
+	// 	b.WriteString("\n  [")
+	// 	b.WriteString(strconv.Itoa(g.start))
+	// 	b.WriteString("..")
+	// 	b.WriteString(strconv.Itoa(g.end))
+	// 	b.WriteString("] gid=")
+	// 	b.WriteString(strconv.Itoa(gi))
+	// 	b.WriteString(" pid=")
+	// 	b.WriteString(strconv.FormatUint(uint64(clients[g.start].policyID), 10))
+	// 	b.WriteString(" members: ")
+
+	// 	for i := g.start; i <= g.end; i++ {
+	// 		if i > g.start {
+	// 			b.WriteString(", ")
+	// 		}
+	// 		b.WriteString(strconv.Itoa(i))
+	// 		b.WriteByte(':')
+	// 		b.WriteString(clients[i].Name())
+	// 	}
+	// }
+	// errors.LogDebug(ctx, b.String())
+
+	return groups, groupOf
+}
+
 func init() {
 	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
 		return New(ctx, config.(*Config))
 	}))
 }
 
-func checkSystemNetwork() (supportIPv4 bool, supportIPv6 bool) {
-	conn4, err4 := net.Dial("udp4", "192.33.4.12:53")
-	if err4 != nil {
-		supportIPv4 = false
-	} else {
-		supportIPv4 = true
-		conn4.Close()
+func probeRoutes() (ipv4 bool, ipv6 bool) {
+	if conn, err := net.Dial("udp4", "192.33.4.12:53"); err == nil {
+		ipv4 = true
+		conn.Close()
 	}
-
-	conn6, err6 := net.Dial("udp6", "[2001:500:2::c]:53")
-	if err6 != nil {
-		supportIPv6 = false
-	} else {
-		supportIPv6 = true
-		conn6.Close()
+	if conn, err := net.Dial("udp6", "[2001:500:2::c]:53"); err == nil {
+		ipv6 = true
+		conn.Close()
 	}
 	return
 }
+
+var routeCache struct {
+	sync.Once
+	sync.RWMutex
+	expire     time.Time
+	ipv4, ipv6 bool
+}
+
+func checkRoutes() (bool, bool) {
+	if !isGUIPlatform {
+		routeCache.Once.Do(func() {
+			routeCache.ipv4, routeCache.ipv6 = probeRoutes()
+		})
+		return routeCache.ipv4, routeCache.ipv6
+	}
+
+	routeCache.RWMutex.RLock()
+	now := time.Now()
+	if routeCache.expire.After(now) {
+		routeCache.RWMutex.RUnlock()
+		return routeCache.ipv4, routeCache.ipv6
+	}
+	routeCache.RWMutex.RUnlock()
+
+	routeCache.RWMutex.Lock()
+	defer routeCache.RWMutex.Unlock()
+
+	now = time.Now()
+	if routeCache.expire.After(now) { // double-check
+		return routeCache.ipv4, routeCache.ipv6
+	}
+	routeCache.ipv4, routeCache.ipv6 = probeRoutes()    // ~2ms
+	routeCache.expire = now.Add(100 * time.Millisecond) // ttl
+	return routeCache.ipv4, routeCache.ipv6
+}
+
+var isGUIPlatform = detectGUIPlatform()
+
+func detectGUIPlatform() bool {
+	switch runtime.GOOS {
+	case "android", "ios", "windows", "darwin":
+		return true
+	case "linux", "freebsd", "openbsd":
+		if t := os.Getenv("XDG_SESSION_TYPE"); t == "wayland" || t == "x11" {
+			return true
+		}
+		if os.Getenv("DISPLAY") != "" || os.Getenv("WAYLAND_DISPLAY") != "" {
+			return true
+		}
+	}
+	return false
+}

app/dns/dnscommon.go

@@ -3,6 +3,7 @@ package dns
 import (
 	"context"
 	"encoding/binary"
+	"math"
 	"strings"
 	"time"
 
@@ -13,10 +14,12 @@ import (
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/core"
 	dns_feature "github.com/xtls/xray-core/features/dns"
+
 	"golang.org/x/net/dns/dnsmessage"
 )
 
 // Fqdn normalizes domain make sure it ends with '.'
+// case-sensitive
 func Fqdn(domain string) string {
 	if len(domain) > 0 && strings.HasSuffix(domain, ".") {
 		return domain
@@ -38,19 +41,14 @@ type IPRecord struct {
 	RawHeader *dnsmessage.Header
 }
 
-func (r *IPRecord) getIPs() ([]net.IP, uint32, error) {
+func (r *IPRecord) getIPs() ([]net.IP, int32, error) {
 	if r == nil {
 		return nil, 0, errRecordNotFound
 	}
-	untilExpire := time.Until(r.Expire).Seconds()
-	if untilExpire <= 0 {
-		return nil, 0, errRecordNotFound
-	}
 
-	ttl := uint32(untilExpire) + 1
-	if ttl == 1 {
-		r.Expire = time.Now().Add(time.Second) // To ensure that two consecutive requests get the same result
-	}
+	untilExpire := time.Until(r.Expire).Seconds()
+	ttl := int32(math.Ceil(untilExpire))
+
 	if r.RCode != dnsmessage.RCodeSuccess {
 		return nil, ttl, dns_feature.RCodeError(r.RCode)
 	}

app/dns/fakedns/fake.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"math"
 	"math/big"
-	gonet "net"
 	"sync"
 	"time"
 
@@ -17,7 +16,7 @@ import (
 
 type Holder struct {
 	domainToIP cache.Lru
-	ipRange    *gonet.IPNet
+	ipRange    *net.IPNet
 	mu         *sync.Mutex
 
 	config *FakeDnsPool
@@ -79,10 +78,10 @@ func (fkdns *Holder) initializeFromConfig() error {
 }
 
 func (fkdns *Holder) initialize(ipPoolCidr string, lruSize int) error {
-	var ipRange *gonet.IPNet
+	var ipRange *net.IPNet
 	var err error
 
-	if _, ipRange, err = gonet.ParseCIDR(ipPoolCidr); err != nil {
+	if _, ipRange, err = net.ParseCIDR(ipPoolCidr); err != nil {
 		return errors.New("Unable to parse CIDR for Fake DNS IP assignment").Base(err).AtError()
 	}
 

app/dns/fakedns/fakedns_test.go

@@ -1,7 +1,6 @@
 package fakedns
 
 import (
-	gonet "net"
 	"strconv"
 	"testing"
 
@@ -155,7 +154,7 @@ func TestFakeDNSMulti(t *testing.T) {
 			assert.True(t, inPool)
 		})
 		t.Run("ipv6", func(t *testing.T) {
-			ip, err := gonet.ResolveIPAddr("ip", "fddd:c5b4:ff5f:f4f0::5")
+			ip, err := net.ResolveIPAddr("ip", "fddd:c5b4:ff5f:f4f0::5")
 			assert.Nil(t, err)
 			inPool := fakeMulti.IsIPInIPPool(net.IPAddress(ip.IP))
 			assert.True(t, inPool)
@@ -165,7 +164,7 @@ func TestFakeDNSMulti(t *testing.T) {
 			assert.False(t, inPool)
 		})
 		t.Run("ipv6_inverse", func(t *testing.T) {
-			ip, err := gonet.ResolveIPAddr("ip", "fcdd:c5b4:ff5f:f4f0::5")
+			ip, err := net.ResolveIPAddr("ip", "fcdd:c5b4:ff5f:f4f0::5")
 			assert.Nil(t, err)
 			inPool := fakeMulti.IsIPInIPPool(net.IPAddress(ip.IP))
 			assert.False(t, inPool)

app/dns/nameserver.go

@@ -20,6 +20,9 @@ import (
 type Server interface {
 	// Name of the Client.
 	Name() string
+
+	IsDisableCache() bool
+
 	// QueryIP sends IP queries to its configured server.
 	QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, uint32, error)
 }
@@ -29,8 +32,8 @@ type Client struct {
 	server        Server
 	skipFallback  bool
 	domains       []string
-	expectedIPs   []*router.GeoIPMatcher
-	unexpectedIPs []*router.GeoIPMatcher
+	expectedIPs   router.GeoIPMatcher
+	unexpectedIPs router.GeoIPMatcher
 	actPrior      bool
 	actUnprior    bool
 	tag           string
@@ -38,10 +41,11 @@ type Client struct {
 	finalQuery    bool
 	ipOption      *dns.IPOption
 	checkSystem   bool
+	policyID      uint32
 }
 
 // NewServer creates a name server object according to the network destination url.
-func NewServer(ctx context.Context, dest net.Destination, dispatcher routing.Dispatcher, disableCache bool, clientIP net.IP) (Server, error) {
+func NewServer(ctx context.Context, dest net.Destination, dispatcher routing.Dispatcher, disableCache bool, serveStale bool, serveExpiredTTL uint32, clientIP net.IP) (Server, error) {
 	if address := dest.Address; address.Family().IsDomain() {
 		u, err := url.Parse(address.Domain())
 		if err != nil {
@@ -51,19 +55,19 @@ func NewServer(ctx context.Context, dest net.Destination, dispatcher routing.Dis
 		case strings.EqualFold(u.String(), "localhost"):
 			return NewLocalNameServer(), nil
 		case strings.EqualFold(u.Scheme, "https"): // DNS-over-HTTPS Remote mode
-			return NewDoHNameServer(u, dispatcher, false, disableCache, clientIP), nil
+			return NewDoHNameServer(u, dispatcher, false, disableCache, serveStale, serveExpiredTTL, clientIP), nil
 		case strings.EqualFold(u.Scheme, "h2c"): // DNS-over-HTTPS h2c Remote mode
-			return NewDoHNameServer(u, dispatcher, true, disableCache, clientIP), nil
+			return NewDoHNameServer(u, dispatcher, true, disableCache, serveStale, serveExpiredTTL, clientIP), nil
 		case strings.EqualFold(u.Scheme, "https+local"): // DNS-over-HTTPS Local mode
-			return NewDoHNameServer(u, nil, false, disableCache, clientIP), nil
+			return NewDoHNameServer(u, nil, false, disableCache, serveStale, serveExpiredTTL, clientIP), nil
 		case strings.EqualFold(u.Scheme, "h2c+local"): // DNS-over-HTTPS h2c Local mode
-			return NewDoHNameServer(u, nil, true, disableCache, clientIP), nil
+			return NewDoHNameServer(u, nil, true, disableCache, serveStale, serveExpiredTTL, clientIP), nil
 		case strings.EqualFold(u.Scheme, "quic+local"): // DNS-over-QUIC Local mode
-			return NewQUICNameServer(u, disableCache, clientIP)
+			return NewQUICNameServer(u, disableCache, serveStale, serveExpiredTTL, clientIP)
 		case strings.EqualFold(u.Scheme, "tcp"): // DNS-over-TCP Remote mode
-			return NewTCPNameServer(u, dispatcher, disableCache, clientIP)
+			return NewTCPNameServer(u, dispatcher, disableCache, serveStale, serveExpiredTTL, clientIP)
 		case strings.EqualFold(u.Scheme, "tcp+local"): // DNS-over-TCP Local mode
-			return NewTCPLocalNameServer(u, disableCache, clientIP)
+			return NewTCPLocalNameServer(u, disableCache, serveStale, serveExpiredTTL, clientIP)
 		case strings.EqualFold(u.String(), "fakedns"):
 			var fd dns.FakeDNSEngine
 			err = core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
@@ -79,7 +83,7 @@ func NewServer(ctx context.Context, dest net.Destination, dispatcher routing.Dis
 		dest.Network = net.Network_UDP
 	}
 	if dest.Network == net.Network_UDP { // UDP classic DNS mode
-		return NewClassicNameServer(dest, dispatcher, disableCache, clientIP), nil
+		return NewClassicNameServer(dest, dispatcher, disableCache, serveStale, serveExpiredTTL, clientIP), nil
 	}
 	return nil, errors.New("No available name server could be created from ", dest).AtWarning()
 }
@@ -89,7 +93,7 @@ func NewClient(
 	ctx context.Context,
 	ns *NameServer,
 	clientIP net.IP,
-	disableCache bool,
+	disableCache bool, serveStale bool, serveExpiredTTL uint32,
 	tag string,
 	ipOption dns.IPOption,
 	matcherInfos *[]*DomainMatcherInfo,
@@ -99,7 +103,7 @@ func NewClient(
 
 	err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
 		// Create a new server for each client for now
-		server, err := NewServer(ctx, ns.Address.AsDestination(), dispatcher, disableCache, clientIP)
+		server, err := NewServer(ctx, ns.Address.AsDestination(), dispatcher, disableCache, serveStale, serveExpiredTTL, clientIP)
 		if err != nil {
 			return errors.New("failed to create nameserver").Base(err).AtWarning()
 		}
@@ -154,23 +158,21 @@ func NewClient(
 		}
 
 		// Establish expected IPs
-		var expectedMatchers []*router.GeoIPMatcher
-		for _, geoip := range ns.ExpectedGeoip {
-			matcher, err := router.GlobalGeoIPContainer.Add(geoip)
+		var expectedMatcher router.GeoIPMatcher
+		if len(ns.ExpectedGeoip) > 0 {
+			expectedMatcher, err = router.BuildOptimizedGeoIPMatcher(ns.ExpectedGeoip...)
 			if err != nil {
 				return errors.New("failed to create expected ip matcher").Base(err).AtWarning()
 			}
-			expectedMatchers = append(expectedMatchers, matcher)
 		}
 
 		// Establish unexpected IPs
-		var unexpectedMatchers []*router.GeoIPMatcher
-		for _, geoip := range ns.UnexpectedGeoip {
-			matcher, err := router.GlobalGeoIPContainer.Add(geoip)
+		var unexpectedMatcher router.GeoIPMatcher
+		if len(ns.UnexpectedGeoip) > 0 {
+			unexpectedMatcher, err = router.BuildOptimizedGeoIPMatcher(ns.UnexpectedGeoip...)
 			if err != nil {
 				return errors.New("failed to create unexpected ip matcher").Base(err).AtWarning()
 			}
-			unexpectedMatchers = append(unexpectedMatchers, matcher)
 		}
 
 		if len(clientIP) > 0 {
@@ -192,8 +194,8 @@ func NewClient(
 		client.server = server
 		client.skipFallback = ns.SkipFallback
 		client.domains = rules
-		client.expectedIPs = expectedMatchers
-		client.unexpectedIPs = unexpectedMatchers
+		client.expectedIPs = expectedMatcher
+		client.unexpectedIPs = unexpectedMatcher
 		client.actPrior = ns.ActPrior
 		client.actUnprior = ns.ActUnprior
 		client.tag = tag
@@ -201,6 +203,7 @@ func NewClient(
 		client.finalQuery = ns.FinalQuery
 		client.ipOption = &ipOption
 		client.checkSystem = checkSystem
+		client.policyID = ns.PolicyID
 		return nil
 	})
 	return client, err
@@ -211,14 +214,10 @@ func (c *Client) Name() string {
 	return c.server.Name()
 }
 
-func (c *Client) IsFinalQuery() bool {
-	return c.finalQuery
-}
-
 // QueryIP sends DNS query to the name server with the client's IP.
 func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, uint32, error) {
 	if c.checkSystem {
-		supportIPv4, supportIPv6 := checkSystemNetwork()
+		supportIPv4, supportIPv6 := checkRoutes()
 		option.IPv4Enable = option.IPv4Enable && supportIPv4
 		option.IPv6Enable = option.IPv6Enable && supportIPv6
 	} else {
@@ -243,32 +242,32 @@ func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption
 		return nil, 0, dns.ErrEmptyResponse
 	}
 
-	if len(c.expectedIPs) > 0 && !c.actPrior {
-		ips = router.MatchIPs(c.expectedIPs, ips, false)
+	if c.expectedIPs != nil && !c.actPrior {
+		ips, _ = c.expectedIPs.FilterIPs(ips)
 		errors.LogDebug(context.Background(), "domain ", domain, " expectedIPs ", ips, " matched at server ", c.Name())
 		if len(ips) == 0 {
 			return nil, 0, dns.ErrEmptyResponse
 		}
 	}
 
-	if len(c.unexpectedIPs) > 0 && !c.actUnprior {
-		ips = router.MatchIPs(c.unexpectedIPs, ips, true)
+	if c.unexpectedIPs != nil && !c.actUnprior {
+		_, ips = c.unexpectedIPs.FilterIPs(ips)
 		errors.LogDebug(context.Background(), "domain ", domain, " unexpectedIPs ", ips, " matched at server ", c.Name())
 		if len(ips) == 0 {
 			return nil, 0, dns.ErrEmptyResponse
 		}
 	}
 
-	if len(c.expectedIPs) > 0 && c.actPrior {
-		ipsNew := router.MatchIPs(c.expectedIPs, ips, false)
+	if c.expectedIPs != nil && c.actPrior {
+		ipsNew, _ := c.expectedIPs.FilterIPs(ips)
 		if len(ipsNew) > 0 {
 			ips = ipsNew
 			errors.LogDebug(context.Background(), "domain ", domain, " priorIPs ", ips, " matched at server ", c.Name())
 		}
 	}
 
-	if len(c.unexpectedIPs) > 0 && c.actUnprior {
-		ipsNew := router.MatchIPs(c.unexpectedIPs, ips, true)
+	if c.unexpectedIPs != nil && c.actUnprior {
+		_, ipsNew := c.unexpectedIPs.FilterIPs(ips)
 		if len(ipsNew) > 0 {
 			ips = ipsNew
 			errors.LogDebug(context.Background(), "domain ", domain, " unpriorIPs ", ips, " matched at server ", c.Name())

app/dns/nameserver_cached.go

@@ -0,0 +1,173 @@
+package dns
+
+import (
+	"context"
+	go_errors "errors"
+	"time"
+
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/log"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/signal/pubsub"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+type CachedNameserver interface {
+	getCacheController() *CacheController
+
+	sendQuery(ctx context.Context, noResponseErrCh chan<- error, fqdn string, option dns.IPOption)
+}
+
+// queryIP is called from dns.Server->queryIPTimeout
+func queryIP(ctx context.Context, s CachedNameserver, domain string, option dns.IPOption) ([]net.IP, uint32, error) {
+	fqdn := Fqdn(domain)
+
+	cache := s.getCacheController()
+	if !cache.disableCache {
+		if rec := cache.findRecords(fqdn); rec != nil {
+			ips, ttl, err := merge(option, rec.A, rec.AAAA)
+			if !go_errors.Is(err, errRecordNotFound) {
+				if ttl > 0 {
+					errors.LogDebugInner(ctx, err, cache.name, " cache HIT ", fqdn, " -> ", ips)
+					log.Record(&log.DNSLog{Server: cache.name, Domain: fqdn, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
+					return ips, uint32(ttl), err
+				}
+				if cache.serveStale && (cache.serveExpiredTTL == 0 || cache.serveExpiredTTL < ttl) {
+					errors.LogDebugInner(ctx, err, cache.name, " cache OPTIMISTE ", fqdn, " -> ", ips)
+					log.Record(&log.DNSLog{Server: cache.name, Domain: fqdn, Result: ips, Status: log.DNSCacheOptimiste, Elapsed: 0, Error: err})
+					go pull(ctx, s, fqdn, option)
+					return ips, 1, err
+				}
+			}
+		}
+	} else {
+		errors.LogDebug(ctx, "DNS cache is disabled. Querying IP for ", fqdn, " at ", cache.name)
+	}
+
+	return fetch(ctx, s, fqdn, option)
+}
+
+func pull(ctx context.Context, s CachedNameserver, fqdn string, option dns.IPOption) {
+	nctx, cancel := context.WithTimeout(context.WithoutCancel(ctx), 8*time.Second)
+	defer cancel()
+
+	fetch(nctx, s, fqdn, option)
+}
+
+func fetch(ctx context.Context, s CachedNameserver, fqdn string, option dns.IPOption) ([]net.IP, uint32, error) {
+	key := fqdn
+	switch {
+	case option.IPv4Enable && option.IPv6Enable:
+		key = key + "46"
+	case option.IPv4Enable:
+		key = key + "4"
+	case option.IPv6Enable:
+		key = key + "6"
+	}
+
+	v, _, _ := s.getCacheController().requestGroup.Do(key, func() (any, error) {
+		return doFetch(ctx, s, fqdn, option), nil
+	})
+	ret := v.(result)
+
+	return ret.ips, ret.ttl, ret.error
+}
+
+type result struct {
+	ips []net.IP
+	ttl uint32
+	error
+}
+
+func doFetch(ctx context.Context, s CachedNameserver, fqdn string, option dns.IPOption) result {
+	sub4, sub6 := s.getCacheController().registerSubscribers(fqdn, option)
+	defer closeSubscribers(sub4, sub6)
+
+	noResponseErrCh := make(chan error, 2)
+	onEvent := func(sub *pubsub.Subscriber) (*IPRecord, error) {
+		if sub == nil {
+			return nil, nil
+		}
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		case err := <-noResponseErrCh:
+			return nil, err
+		case msg := <-sub.Wait():
+			sub.Close()
+			return msg.(*IPRecord), nil // should panic
+		}
+	}
+
+	start := time.Now()
+	s.sendQuery(ctx, noResponseErrCh, fqdn, option)
+
+	rec4, err4 := onEvent(sub4)
+	rec6, err6 := onEvent(sub6)
+
+	var errs []error
+	if err4 != nil {
+		errs = append(errs, err4)
+	}
+	if err6 != nil {
+		errs = append(errs, err6)
+	}
+
+	ips, ttl, err := merge(option, rec4, rec6, errs...)
+	var rTTL uint32
+	if ttl > 0 {
+		rTTL = uint32(ttl)
+	} else if ttl == 0 && go_errors.Is(err, errRecordNotFound) {
+		rTTL = 0
+	} else { // edge case: where a fast rep's ttl expires during the rtt of a slower, parallel query
+		rTTL = 1
+	}
+
+	log.Record(&log.DNSLog{Server: s.getCacheController().name, Domain: fqdn, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
+	return result{ips, rTTL, err}
+}
+
+func merge(option dns.IPOption, rec4 *IPRecord, rec6 *IPRecord, errs ...error) ([]net.IP, int32, error) {
+	var allIPs []net.IP
+	var rTTL int32 = dns.DefaultTTL
+
+	mergeReq := option.IPv4Enable && option.IPv6Enable
+
+	if option.IPv4Enable {
+		ips, ttl, err := rec4.getIPs() // it's safe
+		if !mergeReq || go_errors.Is(err, errRecordNotFound) {
+			return ips, ttl, err
+		}
+		if ttl < rTTL {
+			rTTL = ttl
+		}
+		if len(ips) > 0 {
+			allIPs = append(allIPs, ips...)
+		} else {
+			errs = append(errs, err)
+		}
+	}
+
+	if option.IPv6Enable {
+		ips, ttl, err := rec6.getIPs() // it's safe
+		if !mergeReq || go_errors.Is(err, errRecordNotFound) {
+			return ips, ttl, err
+		}
+		if ttl < rTTL {
+			rTTL = ttl
+		}
+		if len(ips) > 0 {
+			allIPs = append(allIPs, ips...)
+		} else {
+			errs = append(errs, err)
+		}
+	}
+
+	if len(allIPs) > 0 {
+		return allIPs, rTTL, nil
+	}
+	if len(errs) == 2 && go_errors.Is(errs[0], errs[1]) {
+		return nil, rTTL, errs[0]
+	}
+	return nil, rTTL, errors.Combine(errs...)
+}

app/dns/nameserver_doh.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
-	go_errors "errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -38,7 +37,7 @@ type DoHNameServer struct {
 }
 
 // NewDoHNameServer creates DOH/DOHL client object for remote/local resolving.
-func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, h2c bool, disableCache bool, clientIP net.IP) *DoHNameServer {
+func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, h2c bool, disableCache bool, serveStale bool, serveExpiredTTL uint32, clientIP net.IP) *DoHNameServer {
 	url.Scheme = "https"
 	mode := "DOH"
 	if dispatcher == nil {
@@ -46,7 +45,7 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, h2c bool, dis
 	}
 	errors.LogInfo(context.Background(), "DNS: created ", mode, " client for ", url.String(), ", with h2c ", h2c)
 	s := &DoHNameServer{
-		cacheController: NewCacheController(mode+"//"+url.Host, disableCache),
+		cacheController: NewCacheController(mode+"//"+url.Host, disableCache, serveStale, serveExpiredTTL),
 		dohURL:          url.String(),
 		clientIP:        clientIP,
 	}
@@ -117,22 +116,35 @@ func (s *DoHNameServer) Name() string {
 	return s.cacheController.name
 }
 
+// IsDisableCache implements Server.
+func (s *DoHNameServer) IsDisableCache() bool {
+	return s.cacheController.disableCache
+}
+
 func (s *DoHNameServer) newReqID() uint16 {
 	return 0
 }
 
-func (s *DoHNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- error, domain string, option dns_feature.IPOption) {
-	errors.LogInfo(ctx, s.Name(), " querying: ", domain)
+// getCacheController implements CachedNameserver.
+func (s *DoHNameServer) getCacheController() *CacheController {
+	return s.cacheController
+}
 
-	if s.Name()+"." == "DOH//"+domain {
-		errors.LogError(ctx, s.Name(), " tries to resolve itself! Use IP or set \"hosts\" instead.")
-		noResponseErrCh <- errors.New("tries to resolve itself!", s.Name())
+// sendQuery implements CachedNameserver.
+func (s *DoHNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- error, fqdn string, option dns_feature.IPOption) {
+	errors.LogInfo(ctx, s.Name(), " querying: ", fqdn)
+
+	if s.Name()+"." == "DOH//"+fqdn {
+		errors.LogError(ctx, s.Name(), " tries to resolve itself! Use IP or set \"hosts\" instead")
+		if noResponseErrCh != nil {
+			noResponseErrCh <- errors.New("tries to resolve itself!", s.Name())
+		}
 		return
 	}
 
 	// As we don't want our traffic pattern looks like DoH, we use Random-Length Padding instead of Block-Length Padding recommended in RFC 8467
 	// Although DoH server like 1.1.1.1 will pad the response to Block-Length 468, at least it is better than no padding for response at all
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP, int(crypto.RandBetween(100, 300))))
+	reqs := buildReqMsgs(fqdn, option, s.newReqID, genEDNS0Options(s.clientIP, int(crypto.RandBetween(100, 300))))
 
 	var deadline time.Time
 	if d, ok := ctx.Deadline(); ok {
@@ -166,23 +178,29 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- er
 
 			b, err := dns.PackMessage(r.msg)
 			if err != nil {
-				errors.LogErrorInner(ctx, err, "failed to pack dns query for ", domain)
-				noResponseErrCh <- err
+				errors.LogErrorInner(ctx, err, "failed to pack dns query for ", fqdn)
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			resp, err := s.dohHTTPSContext(dnsCtx, b.Bytes())
 			if err != nil {
-				errors.LogErrorInner(ctx, err, "failed to retrieve response for ", domain)
-				noResponseErrCh <- err
+				errors.LogErrorInner(ctx, err, "failed to retrieve response for ", fqdn)
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			rec, err := parseResponse(resp)
 			if err != nil {
-				errors.LogErrorInner(ctx, err, "failed to handle DOH response for ", domain)
-				noResponseErrCh <- err
+				errors.LogErrorInner(ctx, err, "failed to handle DOH response for ", fqdn)
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
-			s.cacheController.updateIP(r, rec)
+			s.cacheController.updateRecord(r, rec)
 		}(req)
 	}
 }
@@ -216,49 +234,6 @@ func (s *DoHNameServer) dohHTTPSContext(ctx context.Context, b []byte) ([]byte,
 }
 
 // QueryIP implements Server.
-func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, uint32, error) { // nolint: dupl
-	fqdn := Fqdn(domain)
-	sub4, sub6 := s.cacheController.registerSubscribers(fqdn, option)
-	defer closeSubscribers(sub4, sub6)
-
-	if s.cacheController.disableCache {
-		errors.LogDebug(ctx, "DNS cache is disabled. Querying IP for ", domain, " at ", s.Name())
-	} else {
-		ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-		if !go_errors.Is(err, errRecordNotFound) {
-			errors.LogDebugInner(ctx, err, s.Name(), " cache HIT ", domain, " -> ", ips)
-			log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
-			return ips, ttl, err
-		}
-	}
-
-	noResponseErrCh := make(chan error, 2)
-	s.sendQuery(ctx, noResponseErrCh, fqdn, option)
-	start := time.Now()
-
-	if sub4 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub4.Wait():
-			sub4.Close()
-		}
-	}
-	if sub6 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub6.Wait():
-			sub6.Close()
-		}
-	}
-
-	ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-	log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
-	return ips, ttl, err
-
+func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, uint32, error) {
+	return queryIP(ctx, s, domain, option)
 }

app/dns/nameserver_doh_test.go

@@ -17,7 +17,7 @@ func TestDOHNameServer(t *testing.T) {
 	url, err := url.Parse("https+local://1.1.1.1/dns-query")
 	common.Must(err)
 
-	s := NewDoHNameServer(url, nil, false, false, net.IP(nil))
+	s := NewDoHNameServer(url, nil, false, false, false, 0, net.IP(nil))
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
 		IPv4Enable: true,
@@ -34,7 +34,7 @@ func TestDOHNameServerWithCache(t *testing.T) {
 	url, err := url.Parse("https+local://1.1.1.1/dns-query")
 	common.Must(err)
 
-	s := NewDoHNameServer(url, nil, false, false, net.IP(nil))
+	s := NewDoHNameServer(url, nil, false, false, false, 0, net.IP(nil))
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
 		IPv4Enable: true,
@@ -62,7 +62,7 @@ func TestDOHNameServerWithIPv4Override(t *testing.T) {
 	url, err := url.Parse("https+local://1.1.1.1/dns-query")
 	common.Must(err)
 
-	s := NewDoHNameServer(url, nil, false, false, net.IP(nil))
+	s := NewDoHNameServer(url, nil, false, false, false, 0, net.IP(nil))
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
 		IPv4Enable: true,
@@ -85,7 +85,7 @@ func TestDOHNameServerWithIPv6Override(t *testing.T) {
 	url, err := url.Parse("https+local://1.1.1.1/dns-query")
 	common.Must(err)
 
-	s := NewDoHNameServer(url, nil, false, false, net.IP(nil))
+	s := NewDoHNameServer(url, nil, false, false, false, 0, net.IP(nil))
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
 		IPv4Enable: false,

app/dns/nameserver_fakedns.go

@@ -20,6 +20,11 @@ func (FakeDNSServer) Name() string {
 	return "FakeDNS"
 }
 
+// IsDisableCache implements Server.
+func (s *FakeDNSServer) IsDisableCache() bool {
+	return true
+}
+
 func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, opt dns.IPOption) ([]net.IP, uint32, error) {
 	if f.fakeDNSEngine == nil {
 		return nil, 0, errors.New("Unable to locate a fake DNS Engine").AtError()

app/dns/nameserver_local.go

@@ -35,6 +35,11 @@ func (s *LocalNameServer) Name() string {
 	return "localhost"
 }
 
+// IsDisableCache implements Server.
+func (s *LocalNameServer) IsDisableCache() bool {
+	return true
+}
+
 // NewLocalNameServer creates localdns server object for directly lookup in system DNS.
 func NewLocalNameServer() *LocalNameServer {
 	errors.LogInfo(context.Background(), "DNS: created localhost client")

app/dns/nameserver_quic.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"encoding/binary"
-	go_errors "errors"
 	"net/url"
 	"sync"
 	"time"
@@ -37,9 +36,7 @@ type QUICNameServer struct {
 }
 
 // NewQUICNameServer creates DNS-over-QUIC client object for local resolving
-func NewQUICNameServer(url *url.URL, disableCache bool, clientIP net.IP) (*QUICNameServer, error) {
-	errors.LogInfo(context.Background(), "DNS: created Local DNS-over-QUIC client for ", url.String())
-
+func NewQUICNameServer(url *url.URL, disableCache bool, serveStale bool, serveExpiredTTL uint32, clientIP net.IP) (*QUICNameServer, error) {
 	var err error
 	port := net.Port(853)
 	if url.Port() != "" {
@@ -51,27 +48,37 @@ func NewQUICNameServer(url *url.URL, disableCache bool, clientIP net.IP) (*QUICN
 	dest := net.UDPDestination(net.ParseAddress(url.Hostname()), port)
 
 	s := &QUICNameServer{
-		cacheController: NewCacheController(url.String(), disableCache),
+		cacheController: NewCacheController(url.String(), disableCache, serveStale, serveExpiredTTL),
 		destination:     &dest,
 		clientIP:        clientIP,
 	}
 
+	errors.LogInfo(context.Background(), "DNS: created Local DNS-over-QUIC client for ", url.String())
 	return s, nil
 }
 
-// Name returns client name
+// Name implements Server.
 func (s *QUICNameServer) Name() string {
 	return s.cacheController.name
 }
 
+// IsDisableCache implements Server.
+func (s *QUICNameServer) IsDisableCache() bool {
+	return s.cacheController.disableCache
+}
+
 func (s *QUICNameServer) newReqID() uint16 {
 	return 0
 }
 
-func (s *QUICNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- error, domain string, option dns_feature.IPOption) {
-	errors.LogInfo(ctx, s.Name(), " querying: ", domain)
+// getCacheController implements CachedNameServer.
+func (s *QUICNameServer) getCacheController() *CacheController { return s.cacheController }
 
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP, 0))
+// sendQuery implements CachedNameServer.
+func (s *QUICNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- error, fqdn string, option dns_feature.IPOption) {
+	errors.LogInfo(ctx, s.Name(), " querying: ", fqdn)
+
+	reqs := buildReqMsgs(fqdn, option, s.newReqID, genEDNS0Options(s.clientIP, 0))
 
 	var deadline time.Time
 	if d, ok := ctx.Deadline(); ok {
@@ -103,7 +110,9 @@ func (s *QUICNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- e
 			b, err := dns.PackMessage(r.msg)
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to pack dns query")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 
@@ -111,13 +120,17 @@ func (s *QUICNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- e
 			err = binary.Write(dnsReqBuf, binary.BigEndian, uint16(b.Len()))
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "binary write failed")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			_, err = dnsReqBuf.Write(b.Bytes())
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "buffer write failed")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			b.Release()
@@ -125,14 +138,18 @@ func (s *QUICNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- e
 			conn, err := s.openStream(dnsCtx)
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to open quic connection")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 
 			_, err = conn.Write(dnsReqBuf.Bytes())
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to send query")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 
@@ -143,81 +160,46 @@ func (s *QUICNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- e
 			n, err := respBuf.ReadFullFrom(conn, 2)
 			if err != nil && n == 0 {
 				errors.LogErrorInner(ctx, err, "failed to read response length")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
-			var length int16
+			var length uint16
 			err = binary.Read(bytes.NewReader(respBuf.Bytes()), binary.BigEndian, &length)
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to parse response length")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			respBuf.Clear()
 			n, err = respBuf.ReadFullFrom(conn, int32(length))
 			if err != nil && n == 0 {
 				errors.LogErrorInner(ctx, err, "failed to read response length")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 
 			rec, err := parseResponse(respBuf.Bytes())
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to handle response")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
-			s.cacheController.updateIP(r, rec)
+			s.cacheController.updateRecord(r, rec)
 		}(req)
 	}
 }
 
-// QueryIP is called from dns.Server->queryIPTimeout
+// QueryIP implements Server.
 func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, uint32, error) {
-	fqdn := Fqdn(domain)
-	sub4, sub6 := s.cacheController.registerSubscribers(fqdn, option)
-	defer closeSubscribers(sub4, sub6)
-
-	if s.cacheController.disableCache {
-		errors.LogDebug(ctx, "DNS cache is disabled. Querying IP for ", domain, " at ", s.Name())
-	} else {
-		ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-		if !go_errors.Is(err, errRecordNotFound) {
-			errors.LogDebugInner(ctx, err, s.Name(), " cache HIT ", domain, " -> ", ips)
-			log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
-			return ips, ttl, err
-		}
-	}
-
-	noResponseErrCh := make(chan error, 2)
-	s.sendQuery(ctx, noResponseErrCh, fqdn, option)
-	start := time.Now()
-
-	if sub4 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub4.Wait():
-			sub4.Close()
-		}
-	}
-	if sub6 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub6.Wait():
-			sub6.Close()
-		}
-	}
-
-	ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-	log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
-	return ips, ttl, err
-
+	return queryIP(ctx, s, domain, option)
 }
 
 func isActive(s *quic.Conn) bool {

app/dns/nameserver_quic_test.go

@@ -16,7 +16,7 @@ import (
 func TestQUICNameServer(t *testing.T) {
 	url, err := url.Parse("quic://dns.adguard-dns.com")
 	common.Must(err)
-	s, err := NewQUICNameServer(url, false, net.IP(nil))
+	s, err := NewQUICNameServer(url, false, false, 0, net.IP(nil))
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns.IPOption{
@@ -43,7 +43,7 @@ func TestQUICNameServer(t *testing.T) {
 func TestQUICNameServerWithIPv4Override(t *testing.T) {
 	url, err := url.Parse("quic://dns.adguard-dns.com")
 	common.Must(err)
-	s, err := NewQUICNameServer(url, false, net.IP(nil))
+	s, err := NewQUICNameServer(url, false, false, 0, net.IP(nil))
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns.IPOption{
@@ -66,7 +66,7 @@ func TestQUICNameServerWithIPv4Override(t *testing.T) {
 func TestQUICNameServerWithIPv6Override(t *testing.T) {
 	url, err := url.Parse("quic://dns.adguard-dns.com")
 	common.Must(err)
-	s, err := NewQUICNameServer(url, false, net.IP(nil))
+	s, err := NewQUICNameServer(url, false, false, 0, net.IP(nil))
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns.IPOption{

app/dns/nameserver_tcp.go

@@ -4,14 +4,12 @@ import (
 	"bytes"
 	"context"
 	"encoding/binary"
-	go_errors "errors"
 	"net/url"
 	"sync/atomic"
 	"time"
 
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/protocol/dns"
@@ -34,10 +32,10 @@ type TCPNameServer struct {
 func NewTCPNameServer(
 	url *url.URL,
 	dispatcher routing.Dispatcher,
-	disableCache bool,
+	disableCache bool, serveStale bool, serveExpiredTTL uint32,
 	clientIP net.IP,
 ) (*TCPNameServer, error) {
-	s, err := baseTCPNameServer(url, "TCP", disableCache, clientIP)
+	s, err := baseTCPNameServer(url, "TCP", disableCache, serveStale, serveExpiredTTL, clientIP)
 	if err != nil {
 		return nil, err
 	}
@@ -54,12 +52,13 @@ func NewTCPNameServer(
 		), nil
 	}
 
+	errors.LogInfo(context.Background(), "DNS: created TCP client initialized for ", url.String())
 	return s, nil
 }
 
 // NewTCPLocalNameServer creates DNS over TCP client object for local resolving
-func NewTCPLocalNameServer(url *url.URL, disableCache bool, clientIP net.IP) (*TCPNameServer, error) {
-	s, err := baseTCPNameServer(url, "TCPL", disableCache, clientIP)
+func NewTCPLocalNameServer(url *url.URL, disableCache bool, serveStale bool, serveExpiredTTL uint32, clientIP net.IP) (*TCPNameServer, error) {
+	s, err := baseTCPNameServer(url, "TCPL", disableCache, serveStale, serveExpiredTTL, clientIP)
 	if err != nil {
 		return nil, err
 	}
@@ -68,10 +67,11 @@ func NewTCPLocalNameServer(url *url.URL, disableCache bool, clientIP net.IP) (*T
 		return internet.DialSystem(ctx, *s.destination, nil)
 	}
 
+	errors.LogInfo(context.Background(), "DNS: created Local TCP client initialized for ", url.String())
 	return s, nil
 }
 
-func baseTCPNameServer(url *url.URL, prefix string, disableCache bool, clientIP net.IP) (*TCPNameServer, error) {
+func baseTCPNameServer(url *url.URL, prefix string, disableCache bool, serveStale bool, serveExpiredTTL uint32, clientIP net.IP) (*TCPNameServer, error) {
 	port := net.Port(53)
 	if url.Port() != "" {
 		var err error
@@ -82,7 +82,7 @@ func baseTCPNameServer(url *url.URL, prefix string, disableCache bool, clientIP
 	dest := net.TCPDestination(net.ParseAddress(url.Hostname()), port)
 
 	s := &TCPNameServer{
-		cacheController: NewCacheController(prefix+"//"+dest.NetAddr(), disableCache),
+		cacheController: NewCacheController(prefix+"//"+dest.NetAddr(), disableCache, serveStale, serveExpiredTTL),
 		destination:     &dest,
 		clientIP:        clientIP,
 	}
@@ -95,14 +95,25 @@ func (s *TCPNameServer) Name() string {
 	return s.cacheController.name
 }
 
+// IsDisableCache implements Server.
+func (s *TCPNameServer) IsDisableCache() bool {
+	return s.cacheController.disableCache
+}
+
 func (s *TCPNameServer) newReqID() uint16 {
 	return uint16(atomic.AddUint32(&s.reqID, 1))
 }
 
-func (s *TCPNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- error, domain string, option dns_feature.IPOption) {
-	errors.LogDebug(ctx, s.Name(), " querying DNS for: ", domain)
+// getCacheController implements CachedNameserver.
+func (s *TCPNameServer) getCacheController() *CacheController {
+	return s.cacheController
+}
 
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP, 0))
+// sendQuery implements CachedNameserver.
+func (s *TCPNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- error, fqdn string, option dns_feature.IPOption) {
+	errors.LogInfo(ctx, s.Name(), " querying DNS for: ", fqdn)
+
+	reqs := buildReqMsgs(fqdn, option, s.newReqID, genEDNS0Options(s.clientIP, 0))
 
 	var deadline time.Time
 	if d, ok := ctx.Deadline(); ok {
@@ -131,14 +142,18 @@ func (s *TCPNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- er
 			b, err := dns.PackMessage(r.msg)
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to pack dns query")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 
 			conn, err := s.dial(dnsCtx)
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to dial namesever")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			defer conn.Close()
@@ -146,13 +161,17 @@ func (s *TCPNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- er
 			err = binary.Write(dnsReqBuf, binary.BigEndian, uint16(b.Len()))
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "binary write failed")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			_, err = dnsReqBuf.Write(b.Bytes())
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "buffer write failed")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			b.Release()
@@ -160,7 +179,9 @@ func (s *TCPNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- er
 			_, err = conn.Write(dnsReqBuf.Bytes())
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to send query")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			dnsReqBuf.Release()
@@ -170,80 +191,45 @@ func (s *TCPNameServer) sendQuery(ctx context.Context, noResponseErrCh chan<- er
 			n, err := respBuf.ReadFullFrom(conn, 2)
 			if err != nil && n == 0 {
 				errors.LogErrorInner(ctx, err, "failed to read response length")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
-			var length int16
+			var length uint16
 			err = binary.Read(bytes.NewReader(respBuf.Bytes()), binary.BigEndian, &length)
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to parse response length")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 			respBuf.Clear()
 			n, err = respBuf.ReadFullFrom(conn, int32(length))
 			if err != nil && n == 0 {
 				errors.LogErrorInner(ctx, err, "failed to read response length")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 
 			rec, err := parseResponse(respBuf.Bytes())
 			if err != nil {
 				errors.LogErrorInner(ctx, err, "failed to parse DNS over TCP response")
-				noResponseErrCh <- err
+				if noResponseErrCh != nil {
+					noResponseErrCh <- err
+				}
 				return
 			}
 
-			s.cacheController.updateIP(r, rec)
+			s.cacheController.updateRecord(r, rec)
 		}(req)
 	}
 }
 
 // QueryIP implements Server.
 func (s *TCPNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, uint32, error) {
-	fqdn := Fqdn(domain)
-	sub4, sub6 := s.cacheController.registerSubscribers(fqdn, option)
-	defer closeSubscribers(sub4, sub6)
-
-	if s.cacheController.disableCache {
-		errors.LogDebug(ctx, "DNS cache is disabled. Querying IP for ", domain, " at ", s.Name())
-	} else {
-		ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-		if !go_errors.Is(err, errRecordNotFound) {
-			errors.LogDebugInner(ctx, err, s.Name(), " cache HIT ", domain, " -> ", ips)
-			log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
-			return ips, ttl, err
-		}
-	}
-
-	noResponseErrCh := make(chan error, 2)
-	s.sendQuery(ctx, noResponseErrCh, fqdn, option)
-	start := time.Now()
-
-	if sub4 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub4.Wait():
-			sub4.Close()
-		}
-	}
-	if sub6 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub6.Wait():
-			sub6.Close()
-		}
-	}
-
-	ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-	log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
-	return ips, ttl, err
-
+	return queryIP(ctx, s, domain, option)
 }

app/dns/nameserver_tcp_test.go

@@ -16,7 +16,7 @@ import (
 func TestTCPLocalNameServer(t *testing.T) {
 	url, err := url.Parse("tcp+local://8.8.8.8")
 	common.Must(err)
-	s, err := NewTCPLocalNameServer(url, false, net.IP(nil))
+	s, err := NewTCPLocalNameServer(url, false, false, 0, net.IP(nil))
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
@@ -33,7 +33,7 @@ func TestTCPLocalNameServer(t *testing.T) {
 func TestTCPLocalNameServerWithCache(t *testing.T) {
 	url, err := url.Parse("tcp+local://8.8.8.8")
 	common.Must(err)
-	s, err := NewTCPLocalNameServer(url, false, net.IP(nil))
+	s, err := NewTCPLocalNameServer(url, false, false, 0, net.IP(nil))
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
@@ -61,7 +61,7 @@ func TestTCPLocalNameServerWithCache(t *testing.T) {
 func TestTCPLocalNameServerWithIPv4Override(t *testing.T) {
 	url, err := url.Parse("tcp+local://8.8.8.8")
 	common.Must(err)
-	s, err := NewTCPLocalNameServer(url, false, net.IP(nil))
+	s, err := NewTCPLocalNameServer(url, false, false, 0, net.IP(nil))
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
@@ -85,7 +85,7 @@ func TestTCPLocalNameServerWithIPv4Override(t *testing.T) {
 func TestTCPLocalNameServerWithIPv6Override(t *testing.T) {
 	url, err := url.Parse("tcp+local://8.8.8.8")
 	common.Must(err)
-	s, err := NewTCPLocalNameServer(url, false, net.IP(nil))
+	s, err := NewTCPLocalNameServer(url, false, false, 0, net.IP(nil))
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, _, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{

app/dns/nameserver_udp.go

@@ -2,7 +2,6 @@ package dns
 
 import (
 	"context"
-	go_errors "errors"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -10,7 +9,6 @@ import (
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol/dns"
 	udp_proto "github.com/xtls/xray-core/common/protocol/udp"
@@ -39,14 +37,14 @@ type udpDnsRequest struct {
 }
 
 // NewClassicNameServer creates udp server object for remote resolving.
-func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher, disableCache bool, clientIP net.IP) *ClassicNameServer {
+func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher, disableCache bool, serveStale bool, serveExpiredTTL uint32, clientIP net.IP) *ClassicNameServer {
 	// default to 53 if unspecific
 	if address.Port == 0 {
 		address.Port = net.Port(53)
 	}
 
 	s := &ClassicNameServer{
-		cacheController: NewCacheController(strings.ToUpper(address.String()), disableCache),
+		cacheController: NewCacheController(strings.ToUpper(address.String()), disableCache, serveStale, serveExpiredTTL),
 		address:         &address,
 		requests:        make(map[uint16]*udpDnsRequest),
 		clientIP:        clientIP,
@@ -56,6 +54,7 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
 		Execute:  s.RequestsCleanup,
 	}
 	s.udpServer = udp.NewDispatcher(dispatcher, s.HandleResponse)
+
 	errors.LogInfo(context.Background(), "DNS: created UDP client initialized for ", address.NetAddr())
 	return s
 }
@@ -65,6 +64,11 @@ func (s *ClassicNameServer) Name() string {
 	return s.cacheController.name
 }
 
+// IsDisableCache implements Server.
+func (s *ClassicNameServer) IsDisableCache() bool {
+	return s.cacheController.disableCache
+}
+
 // RequestsCleanup clears expired items from cache
 func (s *ClassicNameServer) RequestsCleanup() error {
 	now := time.Now()
@@ -94,7 +98,7 @@ func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_prot
 	ipRec, err := parseResponse(payload.Bytes())
 	payload.Release()
 	if err != nil {
-		errors.LogError(ctx, s.Name(), " fail to parse responded DNS udp")
+		errors.LogErrorInner(ctx, err, s.Name(), " fail to parse responded DNS udp")
 		return
 	}
 
@@ -107,7 +111,7 @@ func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_prot
 	}
 	s.Unlock()
 	if !ok {
-		errors.LogError(ctx, s.Name(), " cannot find the pending request")
+		errors.LogErrorInner(ctx, err, s.Name(), " cannot find the pending request")
 		return
 	}
 
@@ -134,7 +138,7 @@ func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_prot
 		}
 	}
 
-	s.cacheController.updateIP(&req.dnsRequest, ipRec)
+	s.cacheController.updateRecord(&req.dnsRequest, ipRec)
 }
 
 func (s *ClassicNameServer) newReqID() uint16 {
@@ -150,10 +154,16 @@ func (s *ClassicNameServer) addPendingRequest(req *udpDnsRequest) {
 	common.Must(s.requestsCleanup.Start())
 }
 
-func (s *ClassicNameServer) sendQuery(ctx context.Context, _ chan<- error, domain string, option dns_feature.IPOption) {
-	errors.LogDebug(ctx, s.Name(), " querying DNS for: ", domain)
+// getCacheController implements CachedNameserver.
+func (s *ClassicNameServer) getCacheController() *CacheController {
+	return s.cacheController
+}
 
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP, 0))
+// sendQuery implements CachedNameserver.
+func (s *ClassicNameServer) sendQuery(ctx context.Context, _ chan<- error, fqdn string, option dns_feature.IPOption) {
+	errors.LogInfo(ctx, s.Name(), " querying DNS for: ", fqdn)
+
+	reqs := buildReqMsgs(fqdn, option, s.newReqID, genEDNS0Options(s.clientIP, 0))
 
 	for _, req := range reqs {
 		udpReq := &udpDnsRequest{
@@ -170,48 +180,5 @@ func (s *ClassicNameServer) sendQuery(ctx context.Context, _ chan<- error, domai
 
 // QueryIP implements Server.
 func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, uint32, error) {
-	fqdn := Fqdn(domain)
-	sub4, sub6 := s.cacheController.registerSubscribers(fqdn, option)
-	defer closeSubscribers(sub4, sub6)
-
-	if s.cacheController.disableCache {
-		errors.LogDebug(ctx, "DNS cache is disabled. Querying IP for ", domain, " at ", s.Name())
-	} else {
-		ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-		if !go_errors.Is(err, errRecordNotFound) {
-			errors.LogDebugInner(ctx, err, s.Name(), " cache HIT ", domain, " -> ", ips)
-			log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
-			return ips, ttl, err
-		}
-	}
-
-	noResponseErrCh := make(chan error, 2)
-	s.sendQuery(ctx, noResponseErrCh, fqdn, option)
-	start := time.Now()
-
-	if sub4 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub4.Wait():
-			sub4.Close()
-		}
-	}
-	if sub6 != nil {
-		select {
-		case <-ctx.Done():
-			return nil, 0, ctx.Err()
-		case err := <-noResponseErrCh:
-			return nil, 0, err
-		case <-sub6.Wait():
-			sub6.Close()
-		}
-	}
-
-	ips, ttl, err := s.cacheController.findIPsForDomain(fqdn, option)
-	log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
-	return ips, ttl, err
-
+	return queryIP(ctx, s, domain, option)
 }

app/proxyman/inbound/worker.go

@@ -2,7 +2,6 @@ package inbound
 
 import (
 	"context"
-	gonet "net"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -565,12 +564,12 @@ func (w *dsWorker) Close() error {
 }
 
 func IsLocal(ip net.IP) bool {
-	addrs, err := gonet.InterfaceAddrs()
+	addrs, err := net.InterfaceAddrs()
 	if err != nil {
 		return false
 	}
 	for _, addr := range addrs {
-		if ipnet, ok := addr.(*gonet.IPNet); ok {
+		if ipnet, ok := addr.(*net.IPNet); ok {
 			if ipnet.IP.Equal(ip) {
 				return true
 			}

app/proxyman/outbound/handler.go

@@ -6,7 +6,6 @@ import (
 	goerrors "errors"
 	"io"
 	"math/big"
-	gonet "net"
 	"os"
 
 	"github.com/xtls/xray-core/common/dice"
@@ -317,8 +316,12 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connecti
 	conn, err := internet.Dial(ctx, dest, h.streamSettings)
 	conn = h.getStatCouterConnection(conn)
 	outbounds := session.OutboundsFromContext(ctx)
-	ob := outbounds[len(outbounds)-1]
-	ob.Conn = conn
+	if outbounds != nil {
+		ob := outbounds[len(outbounds)-1]
+		ob.Conn = conn
+	} else {
+		// for Vision's pre-connect
+	}
 	return conn, err
 }
 
@@ -394,7 +397,7 @@ func (h *Handler) ProxySettings() *serial.TypedMessage {
 
 func ParseRandomIP(addr net.Address, prefix string) net.Address {
 
-	_, ipnet, _ := gonet.ParseCIDR(addr.IP().String() + "/" + prefix)
+	_, ipnet, _ := net.ParseCIDR(addr.IP().String() + "/" + prefix)
 
 	ones, bits := ipnet.Mask.Size()
 	subnetSize := new(big.Int).Lsh(big.NewInt(1), uint(bits-ones))
@@ -408,5 +411,5 @@ func ParseRandomIP(addr net.Address, prefix string) net.Address {
 	padded := make([]byte, len(ipnet.IP))
 	copy(padded[len(padded)-len(rndBytes):], rndBytes)
 
-	return net.ParseAddress(gonet.IP(padded).String())
+	return net.ParseAddress(net.IP(padded).String())
 }

app/reverse/bridge.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"time"
 
-	"github.com/xtls/xray-core/app/dispatcher"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/mux"
 	"github.com/xtls/xray-core/common/net"
@@ -231,7 +230,9 @@ func (w *BridgeWorker) DispatchLink(ctx context.Context, dest net.Destination, l
 		return w.Dispatcher.DispatchLink(ctx, dest, link)
 	}
 
-	link = w.Dispatcher.(*dispatcher.DefaultDispatcher).WrapLink(ctx, link)
+	if d, ok := w.Dispatcher.(routing.WrapLinkDispatcher); ok {
+		link = d.WrapLink(ctx, link)
+	}
 	w.handleInternalConn(link)
 
 	return nil

app/router/condition.go

@@ -47,20 +47,6 @@ var matcherTypeMap = map[Domain_Type]strmatcher.Type{
 	Domain_Full:   strmatcher.Full,
 }
 
-func domainToMatcher(domain *Domain) (strmatcher.Matcher, error) {
-	matcherType, f := matcherTypeMap[domain.Type]
-	if !f {
-		return nil, errors.New("unsupported domain type", domain.Type)
-	}
-
-	matcher, err := matcherType.New(domain.Value)
-	if err != nil {
-		return nil, errors.New("failed to create domain matcher").Base(err)
-	}
-
-	return matcher, nil
-}
-
 type DomainMatcher struct {
 	matchers strmatcher.IndexMatcher
 }
@@ -96,61 +82,53 @@ func (m *DomainMatcher) Apply(ctx routing.Context) bool {
 	return m.ApplyDomain(domain)
 }
 
-type MultiGeoIPMatcher struct {
-	matchers []*GeoIPMatcher
-	asType   string // local, source, target
+type MatcherAsType byte
+
+const (
+	MatcherAsType_Local MatcherAsType = iota
+	MatcherAsType_Source
+	MatcherAsType_Target
+	MatcherAsType_VlessRoute // for port
+)
+
+type IPMatcher struct {
+	matcher GeoIPMatcher
+	asType  MatcherAsType
 }
 
-func NewMultiGeoIPMatcher(geoips []*GeoIP, asType string) (*MultiGeoIPMatcher, error) {
-	var matchers []*GeoIPMatcher
-	for _, geoip := range geoips {
-		matcher, err := GlobalGeoIPContainer.Add(geoip)
-		if err != nil {
-			return nil, err
-		}
-		matchers = append(matchers, matcher)
+func NewIPMatcher(geoips []*GeoIP, asType MatcherAsType) (*IPMatcher, error) {
+	matcher, err := BuildOptimizedGeoIPMatcher(geoips...)
+	if err != nil {
+		return nil, err
 	}
-
-	matcher := &MultiGeoIPMatcher{
-		matchers: matchers,
-		asType:   asType,
-	}
-
-	return matcher, nil
+	return &IPMatcher{matcher: matcher, asType: asType}, nil
 }
 
 // Apply implements Condition.
-func (m *MultiGeoIPMatcher) Apply(ctx routing.Context) bool {
+func (m *IPMatcher) Apply(ctx routing.Context) bool {
 	var ips []net.IP
 
 	switch m.asType {
-	case "local":
+	case MatcherAsType_Local:
 		ips = ctx.GetLocalIPs()
-	case "source":
+	case MatcherAsType_Source:
 		ips = ctx.GetSourceIPs()
-	case "target":
+	case MatcherAsType_Target:
 		ips = ctx.GetTargetIPs()
 	default:
-		panic("unreachable, asType should be local or source or target")
+		panic("unk asType")
 	}
 
-	for _, ip := range ips {
-		for _, matcher := range m.matchers {
-			if matcher.Match(ip) {
-				return true
-			}
-		}
-	}
-	return false
+	return m.matcher.AnyMatch(ips)
 }
 
 type PortMatcher struct {
 	port   net.MemoryPortList
-	asType string // local, source, target
+	asType MatcherAsType
 }
 
 // NewPortMatcher create a new port matcher that can match source or local or destination port
-func NewPortMatcher(list *net.PortList, asType string) *PortMatcher {
+func NewPortMatcher(list *net.PortList, asType MatcherAsType) *PortMatcher {
 	return &PortMatcher{
 		port:   net.PortListFromProto(list),
 		asType: asType,
@@ -160,18 +138,17 @@ func NewPortMatcher(list *net.PortList, asType string) *PortMatcher {
 // Apply implements Condition.
 func (v *PortMatcher) Apply(ctx routing.Context) bool {
 	switch v.asType {
-	case "local":
+	case MatcherAsType_Local:
 		return v.port.Contains(ctx.GetLocalPort())
-	case "source":
+	case MatcherAsType_Source:
 		return v.port.Contains(ctx.GetSourcePort())
-	case "target":
+	case MatcherAsType_Target:
 		return v.port.Contains(ctx.GetTargetPort())
-	case "vlessRoute":
+	case MatcherAsType_VlessRoute:
 		return v.port.Contains(ctx.GetVlessRoute())
 	default:
-		panic("unreachable, asType should be local or source or target")
+		panic("unk asType")
 	}
-
 }
 
 type NetworkMatcher struct {

app/router/condition_geoip_test.go

@@ -35,33 +35,6 @@ func getAssetPath(file string) (string, error) {
 	return path, nil
 }
 
-func TestGeoIPMatcherContainer(t *testing.T) {
-	container := &router.GeoIPMatcherContainer{}
-
-	m1, err := container.Add(&router.GeoIP{
-		CountryCode: "CN",
-	})
-	common.Must(err)
-
-	m2, err := container.Add(&router.GeoIP{
-		CountryCode: "US",
-	})
-	common.Must(err)
-
-	m3, err := container.Add(&router.GeoIP{
-		CountryCode: "CN",
-	})
-	common.Must(err)
-
-	if m1 != m3 {
-		t.Error("expect same matcher for same geoip, but not")
-	}
-
-	if m1 == m2 {
-		t.Error("expect different matcher for different geoip, but actually same")
-	}
-}
-
 func TestGeoIPMatcher(t *testing.T) {
 	cidrList := []*router.CIDR{
 		{Ip: []byte{0, 0, 0, 0}, Prefix: 8},
@@ -80,8 +53,10 @@ func TestGeoIPMatcher(t *testing.T) {
 		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
 	}
 
-	matcher := &router.GeoIPMatcher{}
-	common.Must(matcher.Init(cidrList))
+	matcher, err := router.BuildOptimizedGeoIPMatcher(&router.GeoIP{
+		Cidr: cidrList,
+	})
+	common.Must(err)
 
 	testCases := []struct {
 		Input  string
@@ -140,8 +115,10 @@ func TestGeoIPMatcherRegression(t *testing.T) {
 		{Ip: []byte{98, 108, 20, 0}, Prefix: 23},
 	}
 
-	matcher := &router.GeoIPMatcher{}
-	common.Must(matcher.Init(cidrList))
+	matcher, err := router.BuildOptimizedGeoIPMatcher(&router.GeoIP{
+		Cidr: cidrList,
+	})
+	common.Must(err)
 
 	testCases := []struct {
 		Input  string
@@ -171,9 +148,11 @@ func TestGeoIPReverseMatcher(t *testing.T) {
 		{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
 		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
 	}
-	matcher := &router.GeoIPMatcher{}
-	matcher.SetReverseMatch(true) // Reverse match
-	common.Must(matcher.Init(cidrList))
+	matcher, err := router.BuildOptimizedGeoIPMatcher(&router.GeoIP{
+		Cidr: cidrList,
+	})
+	common.Must(err)
+	matcher.SetReverse(true) // Reverse match
 
 	testCases := []struct {
 		Input  string
@@ -206,8 +185,10 @@ func TestGeoIPMatcher4CN(t *testing.T) {
 	ips, err := loadGeoIP("CN")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
-	common.Must(matcher.Init(ips))
+	matcher, err := router.BuildOptimizedGeoIPMatcher(&router.GeoIP{
+		Cidr: ips,
+	})
+	common.Must(err)
 
 	if matcher.Match([]byte{8, 8, 8, 8}) {
 		t.Error("expect CN geoip doesn't contain 8.8.8.8, but actually does")
@@ -218,8 +199,10 @@ func TestGeoIPMatcher6US(t *testing.T) {
 	ips, err := loadGeoIP("US")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
-	common.Must(matcher.Init(ips))
+	matcher, err := router.BuildOptimizedGeoIPMatcher(&router.GeoIP{
+		Cidr: ips,
+	})
+	common.Must(err)
 
 	if !matcher.Match(net.ParseAddress("2001:4860:4860::8888").IP()) {
 		t.Error("expect US geoip contain 2001:4860:4860::8888, but actually not")
@@ -254,8 +237,10 @@ func BenchmarkGeoIPMatcher4CN(b *testing.B) {
 	ips, err := loadGeoIP("CN")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
-	common.Must(matcher.Init(ips))
+	matcher, err := router.BuildOptimizedGeoIPMatcher(&router.GeoIP{
+		Cidr: ips,
+	})
+	common.Must(err)
 
 	b.ResetTimer()
 
@@ -268,8 +253,10 @@ func BenchmarkGeoIPMatcher6US(b *testing.B) {
 	ips, err := loadGeoIP("US")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
-	common.Must(matcher.Init(ips))
+	matcher, err := router.BuildOptimizedGeoIPMatcher(&router.GeoIP{
+		Cidr: ips,
+	})
+	common.Must(err)
 
 	b.ResetTimer()
 

app/router/condition_test.go

@@ -447,7 +447,7 @@ func BenchmarkMultiGeoIPMatcher(b *testing.B) {
 		})
 	}
 
-	matcher, err := NewMultiGeoIPMatcher(geoips, "target")
+	matcher, err := NewIPMatcher(geoips, MatcherAsType_Target)
 	common.Must(err)
 
 	ctx := withOutbound(&session.Outbound{Target: net.TCPDestination(net.ParseAddress("8.8.8.8"), 80)})

app/router/config.go

@@ -32,72 +32,38 @@ func (r *Rule) Apply(ctx routing.Context) bool {
 func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	conds := NewConditionChan()
 
-	if len(rr.Domain) > 0 {
-		matcher, err := NewMphMatcherGroup(rr.Domain)
-		if err != nil {
-			return nil, errors.New("failed to build domain condition with MphDomainMatcher").Base(err)
-		}
-		errors.LogDebug(context.Background(), "MphDomainMatcher is enabled for ", len(rr.Domain), " domain rule(s)")
-		conds.Add(matcher)
-	}
-
-	if len(rr.UserEmail) > 0 {
-		conds.Add(NewUserMatcher(rr.UserEmail))
-	}
-
-	if rr.VlessRouteList != nil {
-		conds.Add(NewPortMatcher(rr.VlessRouteList, "vlessRoute"))
-	}
-
 	if len(rr.InboundTag) > 0 {
 		conds.Add(NewInboundTagMatcher(rr.InboundTag))
 	}
 
-	if rr.PortList != nil {
-		conds.Add(NewPortMatcher(rr.PortList, "target"))
-	}
-
-	if rr.SourcePortList != nil {
-		conds.Add(NewPortMatcher(rr.SourcePortList, "source"))
-	}
-
-	if rr.LocalPortList != nil {
-		conds.Add(NewPortMatcher(rr.LocalPortList, "local"))
-	}
-
 	if len(rr.Networks) > 0 {
 		conds.Add(NewNetworkMatcher(rr.Networks))
 	}
 
-	if len(rr.Geoip) > 0 {
-		cond, err := NewMultiGeoIPMatcher(rr.Geoip, "target")
-		if err != nil {
-			return nil, err
-		}
-		conds.Add(cond)
-	}
-
-	if len(rr.SourceGeoip) > 0 {
-		cond, err := NewMultiGeoIPMatcher(rr.SourceGeoip, "source")
-		if err != nil {
-			return nil, err
-		}
-		conds.Add(cond)
-	}
-
-	if len(rr.LocalGeoip) > 0 {
-		cond, err := NewMultiGeoIPMatcher(rr.LocalGeoip, "local")
-		if err != nil {
-			return nil, err
-		}
-		conds.Add(cond)
-		errors.LogWarning(context.Background(), "Due to some limitations, in UDP connections, localIP is always equal to listen interface IP, so \"localIP\" rule condition does not work properly on UDP inbound connections that listen on all interfaces")
-	}
-
 	if len(rr.Protocol) > 0 {
 		conds.Add(NewProtocolMatcher(rr.Protocol))
 	}
 
+	if rr.PortList != nil {
+		conds.Add(NewPortMatcher(rr.PortList, MatcherAsType_Target))
+	}
+
+	if rr.SourcePortList != nil {
+		conds.Add(NewPortMatcher(rr.SourcePortList, MatcherAsType_Source))
+	}
+
+	if rr.LocalPortList != nil {
+		conds.Add(NewPortMatcher(rr.LocalPortList, MatcherAsType_Local))
+	}
+
+	if rr.VlessRouteList != nil {
+		conds.Add(NewPortMatcher(rr.VlessRouteList, MatcherAsType_VlessRoute))
+	}
+
+	if len(rr.UserEmail) > 0 {
+		conds.Add(NewUserMatcher(rr.UserEmail))
+	}
+
 	if len(rr.Attributes) > 0 {
 		configuredKeys := make(map[string]*regexp.Regexp)
 		for key, value := range rr.Attributes {
@@ -106,6 +72,40 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 		conds.Add(&AttributeMatcher{configuredKeys})
 	}
 
+	if len(rr.Geoip) > 0 {
+		cond, err := NewIPMatcher(rr.Geoip, MatcherAsType_Target)
+		if err != nil {
+			return nil, err
+		}
+		conds.Add(cond)
+	}
+
+	if len(rr.SourceGeoip) > 0 {
+		cond, err := NewIPMatcher(rr.SourceGeoip, MatcherAsType_Source)
+		if err != nil {
+			return nil, err
+		}
+		conds.Add(cond)
+	}
+
+	if len(rr.LocalGeoip) > 0 {
+		cond, err := NewIPMatcher(rr.LocalGeoip, MatcherAsType_Local)
+		if err != nil {
+			return nil, err
+		}
+		conds.Add(cond)
+		errors.LogWarning(context.Background(), "Due to some limitations, in UDP connections, localIP is always equal to listen interface IP, so \"localIP\" rule condition does not work properly on UDP inbound connections that listen on all interfaces")
+	}
+
+	if len(rr.Domain) > 0 {
+		matcher, err := NewMphMatcherGroup(rr.Domain)
+		if err != nil {
+			return nil, errors.New("failed to build domain condition with MphDomainMatcher").Base(err)
+		}
+		errors.LogDebug(context.Background(), "MphDomainMatcher is enabled for ", len(rr.Domain), " domain rule(s)")
+		conds.Add(matcher)
+	}
+
 	if conds.Len() == 0 {
 		return nil, errors.New("this rule has no effective fields").AtWarning()
 	}

app/router/config.pb.go

@@ -84,8 +84,6 @@ type Config_DomainStrategy int32
 const (
 	// Use domain as is.
 	Config_AsIs Config_DomainStrategy = 0
-	// Always resolve IP for domains.
-	Config_UseIp Config_DomainStrategy = 1
 	// Resolve to IP if the domain doesn't match any rules.
 	Config_IpIfNonMatch Config_DomainStrategy = 2
 	// Resolve to IP if any rule requires IP matching.
@@ -96,13 +94,11 @@ const (
 var (
 	Config_DomainStrategy_name = map[int32]string{
 		0: "AsIs",
-		1: "UseIp",
 		2: "IpIfNonMatch",
 		3: "IpOnDemand",
 	}
 	Config_DomainStrategy_value = map[string]int32{
 		"AsIs":         0,
-		"UseIp":        1,
 		"IpIfNonMatch": 2,
 		"IpOnDemand":   3,
 	}
@@ -1171,7 +1167,7 @@ var file_app_router_config_proto_rawDesc = []byte{
 	0x70, 0x65, 0x63, 0x74, 0x65, 0x64, 0x12, 0x16, 0x0a, 0x06, 0x6d, 0x61, 0x78, 0x52, 0x54, 0x54,
 	0x18, 0x05, 0x20, 0x01, 0x28, 0x03, 0x52, 0x06, 0x6d, 0x61, 0x78, 0x52, 0x54, 0x54, 0x12, 0x1c,
 	0x0a, 0x09, 0x74, 0x6f, 0x6c, 0x65, 0x72, 0x61, 0x6e, 0x63, 0x65, 0x18, 0x06, 0x20, 0x01, 0x28,
-	0x02, 0x52, 0x09, 0x74, 0x6f, 0x6c, 0x65, 0x72, 0x61, 0x6e, 0x63, 0x65, 0x22, 0x9b, 0x02, 0x0a,
+	0x02, 0x52, 0x09, 0x74, 0x6f, 0x6c, 0x65, 0x72, 0x61, 0x6e, 0x63, 0x65, 0x22, 0x90, 0x02, 0x0a,
 	0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x4f, 0x0a, 0x0f, 0x64, 0x6f, 0x6d, 0x61, 0x69,
 	0x6e, 0x5f, 0x73, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0e,
 	0x32, 0x26, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74,
@@ -1185,17 +1181,16 @@ var file_app_router_config_proto_rawDesc = []byte{
 	0x28, 0x0b, 0x32, 0x1e, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f,
 	0x75, 0x74, 0x65, 0x72, 0x2e, 0x42, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69, 0x6e, 0x67, 0x52, 0x75,
 	0x6c, 0x65, 0x52, 0x0d, 0x62, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69, 0x6e, 0x67, 0x52, 0x75, 0x6c,
-	0x65, 0x22, 0x47, 0x0a, 0x0e, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x74, 0x72, 0x61, 0x74,
-	0x65, 0x67, 0x79, 0x12, 0x08, 0x0a, 0x04, 0x41, 0x73, 0x49, 0x73, 0x10, 0x00, 0x12, 0x09, 0x0a,
-	0x05, 0x55, 0x73, 0x65, 0x49, 0x70, 0x10, 0x01, 0x12, 0x10, 0x0a, 0x0c, 0x49, 0x70, 0x49, 0x66,
-	0x4e, 0x6f, 0x6e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x10, 0x02, 0x12, 0x0e, 0x0a, 0x0a, 0x49, 0x70,
-	0x4f, 0x6e, 0x44, 0x65, 0x6d, 0x61, 0x6e, 0x64, 0x10, 0x03, 0x42, 0x4f, 0x0a, 0x13, 0x63, 0x6f,
-	0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74, 0x65,
-	0x72, 0x50, 0x01, 0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f,
-	0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61,
-	0x70, 0x70, 0x2f, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0xaa, 0x02, 0x0f, 0x58, 0x72, 0x61, 0x79,
-	0x2e, 0x41, 0x70, 0x70, 0x2e, 0x52, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x33,
+	0x65, 0x22, 0x3c, 0x0a, 0x0e, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x74, 0x72, 0x61, 0x74,
+	0x65, 0x67, 0x79, 0x12, 0x08, 0x0a, 0x04, 0x41, 0x73, 0x49, 0x73, 0x10, 0x00, 0x12, 0x10, 0x0a,
+	0x0c, 0x49, 0x70, 0x49, 0x66, 0x4e, 0x6f, 0x6e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x10, 0x02, 0x12,
+	0x0e, 0x0a, 0x0a, 0x49, 0x70, 0x4f, 0x6e, 0x44, 0x65, 0x6d, 0x61, 0x6e, 0x64, 0x10, 0x03, 0x42,
+	0x4f, 0x0a, 0x13, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e,
+	0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x50, 0x01, 0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62,
+	0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63,
+	0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0xaa, 0x02,
+	0x0f, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x52, 0x6f, 0x75, 0x74, 0x65, 0x72,
+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

app/router/config.proto

@@ -147,8 +147,8 @@ message Config {
     // Use domain as is.
     AsIs = 0;
 
-    // Always resolve IP for domains.
-    UseIp = 1;
+    // [Deprecated] Always resolve IP for domains.
+    // UseIp = 1;
 
     // Resolve to IP if the domain doesn't match any rules.
     IpIfNonMatch = 2;

common/log/dns.go

@@ -43,8 +43,9 @@ func (l *DNSLog) String() string {
 type dnsStatus string
 
 var (
-	DNSQueried  = dnsStatus("got answer:")
-	DNSCacheHit = dnsStatus("cache HIT:")
+	DNSQueried        = dnsStatus("got answer:")
+	DNSCacheHit       = dnsStatus("cache HIT:")
+	DNSCacheOptimiste = dnsStatus("cache OPTIMISTE:")
 )
 
 func joinNetIP(ips []net.IP) string {

common/mux/server.go

@@ -5,7 +5,6 @@ import (
 	"io"
 	"time"
 
-	"github.com/xtls/xray-core/app/dispatcher"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
@@ -64,7 +63,9 @@ func (s *Server) DispatchLink(ctx context.Context, dest net.Destination, link *t
 	if dest.Address != muxCoolAddress {
 		return s.dispatcher.DispatchLink(ctx, dest, link)
 	}
-	link = s.dispatcher.(*dispatcher.DefaultDispatcher).WrapLink(ctx, link)
+	if d, ok := s.dispatcher.(routing.WrapLinkDispatcher); ok {
+		link = d.WrapLink(ctx, link)
+	}
 	worker, err := NewServerWorker(ctx, s.dispatcher, link)
 	if err != nil {
 		return err

common/net/system.go

@@ -12,6 +12,8 @@ var (
 
 type ListenConfig = net.ListenConfig
 
+type KeepAliveConfig = net.KeepAliveConfig
+
 var (
 	Listen     = net.Listen
 	ListenTCP  = net.ListenTCP
@@ -26,6 +28,12 @@ var FileConn = net.FileConn
 // ParseIP is an alias of net.ParseIP
 var ParseIP = net.ParseIP
 
+var ParseCIDR = net.ParseCIDR
+
+var ResolveIPAddr = net.ResolveIPAddr
+
+var InterfaceByName = net.InterfaceByName
+
 var SplitHostPort = net.SplitHostPort
 
 var CIDRMask = net.CIDRMask
@@ -51,6 +59,8 @@ type (
 	UnixConn = net.UnixConn
 )
 
+type IPAddr = net.IPAddr
+
 // IP is an alias for net.IP.
 type (
 	IP     = net.IP
@@ -82,3 +92,11 @@ var (
 )
 
 type Resolver = net.Resolver
+
+var DefaultResolver = net.DefaultResolver
+
+var JoinHostPort = net.JoinHostPort
+
+var InterfaceAddrs = net.InterfaceAddrs
+
+var Interfaces = net.Interfaces

common/platform/ctlcmd/attr_other.go

@@ -1,10 +0,0 @@
-//go:build !windows
-// +build !windows
-
-package ctlcmd
-
-import "syscall"
-
-func getSysProcAttr() *syscall.SysProcAttr {
-	return nil
-}

common/platform/ctlcmd/attr_windows.go

@@ -1,12 +0,0 @@
-//go:build windows
-// +build windows
-
-package ctlcmd
-
-import "syscall"
-
-func getSysProcAttr() *syscall.SysProcAttr {
-	return &syscall.SysProcAttr{
-		HideWindow: true,
-	}
-}

common/platform/ctlcmd/ctlcmd.go

@@ -1,50 +0,0 @@
-package ctlcmd
-
-import (
-	"context"
-	"io"
-	"os"
-	"os/exec"
-	"strings"
-
-	"github.com/xtls/xray-core/common/buf"
-	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/platform"
-)
-
-func Run(args []string, input io.Reader) (buf.MultiBuffer, error) {
-	xctl := platform.GetToolLocation("xctl")
-	if _, err := os.Stat(xctl); err != nil {
-		return nil, errors.New("xctl doesn't exist").Base(err)
-	}
-
-	var errBuffer buf.MultiBufferContainer
-	var outBuffer buf.MultiBufferContainer
-
-	cmd := exec.Command(xctl, args...)
-	cmd.Stderr = &errBuffer
-	cmd.Stdout = &outBuffer
-	cmd.SysProcAttr = getSysProcAttr()
-	if input != nil {
-		cmd.Stdin = input
-	}
-
-	if err := cmd.Start(); err != nil {
-		return nil, errors.New("failed to start xctl").Base(err)
-	}
-
-	if err := cmd.Wait(); err != nil {
-		msg := "failed to execute xctl"
-		if errBuffer.Len() > 0 {
-			msg += ": \n" + strings.TrimSpace(errBuffer.MultiBuffer.String())
-		}
-		return nil, errors.New(msg).Base(err)
-	}
-
-	// log stderr, info message
-	if !errBuffer.IsEmpty() {
-		errors.LogInfo(context.Background(), "<xctl message> \n", strings.TrimSpace(errBuffer.MultiBuffer.String()))
-	}
-
-	return outBuffer.MultiBuffer, nil
-}

common/platform/others.go

@@ -8,19 +8,10 @@ import (
 	"path/filepath"
 )
 
-func ExpandEnv(s string) string {
-	return os.ExpandEnv(s)
-}
-
 func LineSeparator() string {
 	return "\n"
 }
 
-func GetToolLocation(file string) string {
-	toolPath := NewEnvFlag(ToolLocation).GetValue(getExecutableDir)
-	return filepath.Join(toolPath, file)
-}
-
 // GetAssetLocation searches for `file` in the env dir, the executable dir, and certain locations
 func GetAssetLocation(file string) string {
 	assetPath := NewEnvFlag(AssetLocation).GetValue(getExecutableDir)

common/platform/platform.go

@@ -8,10 +8,8 @@ import (
 )
 
 const (
-	PluginLocation  = "xray.location.plugin"
 	ConfigLocation  = "xray.location.config"
 	ConfdirLocation = "xray.location.confdir"
-	ToolLocation    = "xray.location.tool"
 	AssetLocation   = "xray.location.asset"
 	CertLocation    = "xray.location.cert"
 
@@ -79,17 +77,6 @@ func getExecutableDir() string {
 	return filepath.Dir(exec)
 }
 
-func getExecutableSubDir(dir string) func() string {
-	return func() string {
-		return filepath.Join(getExecutableDir(), dir)
-	}
-}
-
-func GetPluginDirectory() string {
-	pluginDir := NewEnvFlag(PluginLocation).GetValue(getExecutableSubDir("plugins"))
-	return pluginDir
-}
-
 func GetConfigurationPath() string {
 	configPath := NewEnvFlag(ConfigLocation).GetValue(getExecutableDir)
 	return filepath.Join(configPath, "config.json")

common/platform/windows.go

@@ -5,20 +5,10 @@ package platform
 
 import "path/filepath"
 
-func ExpandEnv(s string) string {
-	// TODO
-	return s
-}
-
 func LineSeparator() string {
 	return "\r\n"
 }
 
-func GetToolLocation(file string) string {
-	toolPath := NewEnvFlag(ToolLocation).GetValue(getExecutableDir)
-	return filepath.Join(toolPath, file+".exe")
-}
-
 // GetAssetLocation searches for `file` in the env dir and the executable dir
 func GetAssetLocation(file string) string {
 	assetPath := NewEnvFlag(AssetLocation).GetValue(getExecutableDir)

core/config.go

@@ -64,7 +64,7 @@ func GetMergedConfig(args cmdarg.Arg) (string, error) {
 	var files []*ConfigSource
 	supported := []string{"json", "yaml", "toml"}
 	for _, file := range args {
-		format := getFormat(file)
+		format := GetFormat(file)
 		if slices.Contains(supported, format) {
 			files = append(files, &ConfigSource{
 				Name:   file,
@@ -98,7 +98,7 @@ func getExtension(filename string) string {
 	return filename[idx+1:]
 }
 
-func getFormat(filename string) string {
+func GetFormat(filename string) string {
 	return GetFormatByExtension(getExtension(filename))
 }
 
@@ -112,7 +112,7 @@ func LoadConfig(formatName string, input interface{}) (*Config, error) {
 
 			if formatName == "auto" {
 				if file != "stdin:" {
-					f = getFormat(file)
+					f = GetFormat(file)
 				} else {
 					f = "json"
 				}

core/core.go

@@ -18,8 +18,8 @@ import (
 
 var (
 	Version_x byte = 25
-	Version_y byte = 10
-	Version_z byte = 15
+	Version_y byte = 12
+	Version_z byte = 8
 )
 
 var (

features/routing/dispatcher.go

@@ -26,3 +26,9 @@ type Dispatcher interface {
 func DispatcherType() interface{} {
 	return (*Dispatcher)(nil)
 }
+
+// Just for type assertion
+type WrapLinkDispatcher interface {
+	Dispatcher
+	WrapLink(ctx context.Context, link *transport.Link) *transport.Link
+}

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/miekg/dns v1.1.68
 	github.com/pelletier/go-toml v1.9.5
 	github.com/pires/go-proxyproto v0.8.1
-	github.com/quic-go/quic-go v0.55.0
+	github.com/quic-go/quic-go v0.57.1
 	github.com/refraction-networking/utls v1.8.1
 	github.com/sagernet/sing v0.5.1
 	github.com/sagernet/sing-shadowsocks v0.2.7
@@ -21,12 +21,12 @@ require (
 	github.com/vishvananda/netlink v1.3.1
 	github.com/xtls/reality v0.0.0-20251014195629-e4eec4520535
 	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
-	golang.org/x/crypto v0.43.0
-	golang.org/x/net v0.46.0
-	golang.org/x/sync v0.17.0
-	golang.org/x/sys v0.37.0
+	golang.org/x/crypto v0.46.0
+	golang.org/x/net v0.48.0
+	golang.org/x/sync v0.19.0
+	golang.org/x/sys v0.39.0
 	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173
-	google.golang.org/grpc v1.76.0
+	google.golang.org/grpc v1.77.0
 	google.golang.org/protobuf v1.36.10
 	gvisor.dev/gvisor v0.0.0-20250428193742-2d800c3129d5
 	h12.io/socks v1.0.3
@@ -41,17 +41,17 @@ require (
 	github.com/juju/ratelimit v1.0.2 // indirect
 	github.com/klauspost/compress v1.17.4 // indirect
 	github.com/klauspost/cpuid/v2 v2.0.12 // indirect
-	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/quic-go/qpack v0.5.1 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
 	github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 // indirect
 	github.com/vishvananda/netns v0.0.5 // indirect
-	golang.org/x/mod v0.28.0 // indirect
-	golang.org/x/text v0.30.0 // indirect
-	golang.org/x/time v0.7.0 // indirect
-	golang.org/x/tools v0.37.0 // indirect
+	golang.org/x/mod v0.30.0 // indirect
+	golang.org/x/text v0.32.0 // indirect
+	golang.org/x/time v0.12.0 // indirect
+	golang.org/x/tools v0.39.0 // indirect
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250804133106-a7a43d27e69b // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251022142026-3a174f9686a8 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -46,19 +46,18 @@ github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoU
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rKnNBTvrwdmkUpLnDpZoAHvWaiq5+iMmen4AE=
 github.com/pires/go-proxyproto v0.8.1 h1:9KEixbdJfhrbtjpz/ZwCdWDD2Xem0NZ38qMYaASJgp0=
 github.com/pires/go-proxyproto v0.8.1/go.mod h1:ZKAAyp3cgy5Y5Mo4n9AlScrkCZwUy0g3Jf+slqQVcuU=
-github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/quic-go/qpack v0.5.1 h1:giqksBPnT/HDtZ6VhtFKgoLOWmlyo9Ei6u9PqzIMbhI=
-github.com/quic-go/qpack v0.5.1/go.mod h1:+PC4XFrEskIVkcLzpEkbLqq1uCoxPhQuvK5rH1ZgaEg=
-github.com/quic-go/quic-go v0.55.0 h1:zccPQIqYCXDt5NmcEabyYvOnomjs8Tlwl7tISjJh9Mk=
-github.com/quic-go/quic-go v0.55.0/go.mod h1:DR51ilwU1uE164KuWXhinFcKWGlEjzys2l8zUl5Ss1U=
+github.com/quic-go/qpack v0.6.0 h1:g7W+BMYynC1LbYLSqRt8PBg5Tgwxn214ZZR34VIOjz8=
+github.com/quic-go/qpack v0.6.0/go.mod h1:lUpLKChi8njB4ty2bFLX2x4gzDqXwUpaO1DP9qMDZII=
+github.com/quic-go/quic-go v0.57.1 h1:25KAAR9QR8KZrCZRThWMKVAwGoiHIrNbT72ULHTuI10=
+github.com/quic-go/quic-go v0.57.1/go.mod h1:ly4QBAjHA2VhdnxhojRsCUOeJwKYg+taDlos92xb1+s=
 github.com/refraction-networking/utls v1.8.1 h1:yNY1kapmQU8JeM1sSw2H2asfTIwWxIkrMJI0pRUOCAo=
 github.com/refraction-networking/utls v1.8.1/go.mod h1:jkSOEkLqn+S/jtpEHPOsVv/4V4EVnelwbMQl4vCWXAM=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr8meMVVGxhp+QBTqY91tM8HjEuMjGg=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3/go.mod h1:HgjTstvQsPGkxUsCd2KWxErBblirPizecHcpD3ffK+s=
-github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
-github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/sagernet/sing v0.5.1 h1:mhL/MZVq0TjuvHcpYcFtmSD1BFOxZ/+8ofbNZcg1k1Y=
 github.com/sagernet/sing v0.5.1/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
 github.com/sagernet/sing-shadowsocks v0.2.7 h1:zaopR1tbHEw5Nk6FAkM05wCslV6ahVegEZaKMv9ipx8=
@@ -78,38 +77,38 @@ github.com/vishvananda/netns v0.0.5/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZla
 github.com/xtls/reality v0.0.0-20251014195629-e4eec4520535 h1:nwobseOLLRtdbP6z7Z2aVI97u8ZptTgD1ofovhAKmeU=
 github.com/xtls/reality v0.0.0-20251014195629-e4eec4520535/go.mod h1:vbHCV/3VWUvy1oKvTxxWJRPEWSeR1sYgQHIh6u/JiZQ=
 github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
-go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
-go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
-go.opentelemetry.io/otel v1.37.0 h1:9zhNfelUvx0KBfu/gb+ZgeAfAgtWrfHJZcAqFC228wQ=
-go.opentelemetry.io/otel v1.37.0/go.mod h1:ehE/umFRLnuLa/vSccNq9oS1ErUlkkK71gMcN34UG8I=
-go.opentelemetry.io/otel/metric v1.37.0 h1:mvwbQS5m0tbmqML4NqK+e3aDiO02vsf/WgbsdpcPoZE=
-go.opentelemetry.io/otel/metric v1.37.0/go.mod h1:04wGrZurHYKOc+RKeye86GwKiTb9FKm1WHtO+4EVr2E=
-go.opentelemetry.io/otel/sdk v1.37.0 h1:ItB0QUqnjesGRvNcmAcU0LyvkVyGJ2xftD29bWdDvKI=
-go.opentelemetry.io/otel/sdk v1.37.0/go.mod h1:VredYzxUvuo2q3WRcDnKDjbdvmO0sCzOvVAiY+yUkAg=
-go.opentelemetry.io/otel/sdk/metric v1.37.0 h1:90lI228XrB9jCMuSdA0673aubgRobVZFhbjxHHspCPc=
-go.opentelemetry.io/otel/sdk/metric v1.37.0/go.mod h1:cNen4ZWfiD37l5NhS+Keb5RXVWZWpRE+9WyVCpbo5ps=
-go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
-go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
+go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
+go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
+go.opentelemetry.io/otel v1.38.0 h1:RkfdswUDRimDg0m2Az18RKOsnI8UDzppJAtj01/Ymk8=
+go.opentelemetry.io/otel v1.38.0/go.mod h1:zcmtmQ1+YmQM9wrNsTGV/q/uyusom3P8RxwExxkZhjM=
+go.opentelemetry.io/otel/metric v1.38.0 h1:Kl6lzIYGAh5M159u9NgiRkmoMKjvbsKtYRwgfrA6WpA=
+go.opentelemetry.io/otel/metric v1.38.0/go.mod h1:kB5n/QoRM8YwmUahxvI3bO34eVtQf2i4utNVLr9gEmI=
+go.opentelemetry.io/otel/sdk v1.38.0 h1:l48sr5YbNf2hpCUj/FoGhW9yDkl+Ma+LrVl8qaM5b+E=
+go.opentelemetry.io/otel/sdk v1.38.0/go.mod h1:ghmNdGlVemJI3+ZB5iDEuk4bWA3GkTpW+DOoZMYBVVg=
+go.opentelemetry.io/otel/sdk/metric v1.38.0 h1:aSH66iL0aZqo//xXzQLYozmWrXxyFkBJ6qT5wthqPoM=
+go.opentelemetry.io/otel/sdk/metric v1.38.0/go.mod h1:dg9PBnW9XdQ1Hd6ZnRz689CbtrUp0wMMs9iPcgT9EZA=
+go.opentelemetry.io/otel/trace v1.38.0 h1:Fxk5bKrDZJUH+AMyyIXGcFAPah0oRcT+LuNtJrmcNLE=
+go.opentelemetry.io/otel/trace v1.38.0/go.mod h1:j1P9ivuFsTceSWe1oY+EeW3sc+Pp42sO++GHkg4wwhs=
 go.uber.org/mock v0.5.2 h1:LbtPTcP8A5k9WPXj54PPPbjcI4Y6lhyOZXn+VS7wNko=
 go.uber.org/mock v0.5.2/go.mod h1:wLlUxC2vVTPTaE3UD51E0BGOAElKrILxhVSDYQLld5o=
 go4.org/netipx v0.0.0-20231129151722-fdeea329fbba h1:0b9z3AuHCjxk0x/opv64kcgZLBseWJUpBw5I82+2U4M=
 go4.org/netipx v0.0.0-20231129151722-fdeea329fbba/go.mod h1:PLyyIXexvUFg3Owu6p/WfdlivPbZJsZdgWZlrGope/Y=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.43.0 h1:dduJYIi3A3KOfdGOHX8AVZ/jGiyPa3IbBozJ5kNuE04=
-golang.org/x/crypto v0.43.0/go.mod h1:BFbav4mRNlXJL4wNeejLpWxB7wMbc79PdRGhWKncxR0=
+golang.org/x/crypto v0.46.0 h1:cKRW/pmt1pKAfetfu+RCEvjvZkA9RimPbh7bhFjGVBU=
+golang.org/x/crypto v0.46.0/go.mod h1:Evb/oLKmMraqjZ2iQTwDwvCtJkczlDuTmdJXoZVzqU0=
 golang.org/x/mod v0.5.1/go.mod h1:5OXOZSfqPIIbmVBIIKWRFfZjPR0E5r58TLhUjH0a2Ro=
-golang.org/x/mod v0.28.0 h1:gQBtGhjxykdjY9YhZpSlZIsbnaE2+PgjfLWUQTnoZ1U=
-golang.org/x/mod v0.28.0/go.mod h1:yfB/L0NOf/kmEbXjzCPOx1iK1fRutOydrCMsqRhEBxI=
+golang.org/x/mod v0.30.0 h1:fDEXFVZ/fmCKProc/yAXXUijritrDzahmwwefnjoPFk=
+golang.org/x/mod v0.30.0/go.mod h1:lAsf5O2EvJeSFMiBxXDki7sCgAxEUcZHXoXMKT4GJKc=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.46.0 h1:giFlY12I07fugqwPuWJi68oOnpfqFnJIJzaIIm2JVV4=
-golang.org/x/net v0.46.0/go.mod h1:Q9BGdFy1y4nkUwiLvT5qtyhAnEHgnQ/zd8PfU6nc210=
+golang.org/x/net v0.48.0 h1:zyQRTTrjc33Lhh0fBgT/H3oZq9WuvRR5gPC70xpDiQU=
+golang.org/x/net v0.48.0/go.mod h1:+ndRgGjkh8FGtu1w1FGbEC31if4VrNVMuKTgcAAnQRY=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
-golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
+golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -117,21 +116,21 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
-golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/sys v0.39.0 h1:CvCKL8MeisomCi6qNZ+wbb0DN9E5AATixKsvNtMoMFk=
+golang.org/x/sys v0.39.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.30.0 h1:yznKA/E9zq54KzlzBEAWn1NXSQ8DIp/NYMy88xJjl4k=
-golang.org/x/text v0.30.0/go.mod h1:yDdHFIX9t+tORqspjENWgzaCVXgk0yYnYuSZ8UzzBVM=
-golang.org/x/time v0.7.0 h1:ntUhktv3OPE6TgYxXWv9vKvUSJyIFJlyohwbkEwPrKQ=
-golang.org/x/time v0.7.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/text v0.32.0 h1:ZD01bjUt1FQ9WJ0ClOL5vxgxOI/sVCNgX1YtKwcY0mU=
+golang.org/x/text v0.32.0/go.mod h1:o/rUWzghvpD5TXrTIBuJU77MTaN0ljMWE47kxGJQ7jY=
+golang.org/x/time v0.12.0 h1:ScB/8o8olJvc+CQPWrK3fPZNfh7qgwCrY0zJmoEQLSE=
+golang.org/x/time v0.12.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.8/go.mod h1:nABZi5QlRsZVlzPpHl034qft6wpY4eDcsTt5AaioBiU=
-golang.org/x/tools v0.37.0 h1:DVSRzp7FwePZW356yEAChSdNcQo6Nsp+fex1SUW09lE=
-golang.org/x/tools v0.37.0/go.mod h1:MBN5QPQtLMHVdvsbtarmTNukZDdgwdwlO5qGacAzF0w=
+golang.org/x/tools v0.39.0 h1:ik4ho21kwuQln40uelmciQPp9SipgNDdrafrYA4TmQQ=
+golang.org/x/tools v0.39.0/go.mod h1:JnefbkDPyD8UU2kI5fuf8ZX4/yUeh9W877ZeBONxUqQ=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -141,10 +140,10 @@ golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173 h1:/jFs0duh4rdb8uI
 golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173/go.mod h1:tkCQ4FQXmpAgYVh++1cq16/dH4QJtmvpRv19DWGAHSA=
 gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
 gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250804133106-a7a43d27e69b h1:zPKJod4w6F1+nRGDI9ubnXYhU9NSWoFAijkHkUXeTK8=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250804133106-a7a43d27e69b/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
-google.golang.org/grpc v1.76.0 h1:UnVkv1+uMLYXoIz6o7chp59WfQUYA2ex/BXQ9rHZu7A=
-google.golang.org/grpc v1.76.0/go.mod h1:Ju12QI8M6iQJtbcsV+awF5a4hfJMLi4X0JLo94ULZ6c=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251022142026-3a174f9686a8 h1:M1rk8KBnUsBDg1oPGHNCxG4vc1f49epmTO7xscSajMk=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251022142026-3a174f9686a8/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
+google.golang.org/grpc v1.77.0 h1:wVVY6/8cGA6vvffn+wWK5ToddbgdU3d8MNENr4evgXM=
+google.golang.org/grpc v1.77.0/go.mod h1:z0BY1iVj0q8E1uSQCjL9cppRj+gnZjzDnzV0dHhrNig=
 google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
 google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

infra/conf/dns.go

@@ -16,19 +16,21 @@ import (
 )
 
 type NameServerConfig struct {
-	Address       *Address   `json:"address"`
-	ClientIP      *Address   `json:"clientIp"`
-	Port          uint16     `json:"port"`
-	SkipFallback  bool       `json:"skipFallback"`
-	Domains       []string   `json:"domains"`
-	ExpectedIPs   StringList `json:"expectedIPs"`
-	ExpectIPs     StringList `json:"expectIPs"`
-	QueryStrategy string     `json:"queryStrategy"`
-	Tag           string     `json:"tag"`
-	TimeoutMs     uint64     `json:"timeoutMs"`
-	DisableCache  bool       `json:"disableCache"`
-	FinalQuery    bool       `json:"finalQuery"`
-	UnexpectedIPs StringList `json:"unexpectedIPs"`
+	Address         *Address   `json:"address"`
+	ClientIP        *Address   `json:"clientIp"`
+	Port            uint16     `json:"port"`
+	SkipFallback    bool       `json:"skipFallback"`
+	Domains         []string   `json:"domains"`
+	ExpectedIPs     StringList `json:"expectedIPs"`
+	ExpectIPs       StringList `json:"expectIPs"`
+	QueryStrategy   string     `json:"queryStrategy"`
+	Tag             string     `json:"tag"`
+	TimeoutMs       uint64     `json:"timeoutMs"`
+	DisableCache    *bool      `json:"disableCache"`
+	ServeStale      *bool      `json:"serveStale"`
+	ServeExpiredTTL *uint32    `json:"serveExpiredTTL"`
+	FinalQuery      bool       `json:"finalQuery"`
+	UnexpectedIPs   StringList `json:"unexpectedIPs"`
 }
 
 // UnmarshalJSON implements encoding/json.Unmarshaler.UnmarshalJSON
@@ -40,19 +42,21 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 	}
 
 	var advanced struct {
-		Address       *Address   `json:"address"`
-		ClientIP      *Address   `json:"clientIp"`
-		Port          uint16     `json:"port"`
-		SkipFallback  bool       `json:"skipFallback"`
-		Domains       []string   `json:"domains"`
-		ExpectedIPs   StringList `json:"expectedIPs"`
-		ExpectIPs     StringList `json:"expectIPs"`
-		QueryStrategy string     `json:"queryStrategy"`
-		Tag           string     `json:"tag"`
-		TimeoutMs     uint64     `json:"timeoutMs"`
-		DisableCache  bool       `json:"disableCache"`
-		FinalQuery    bool       `json:"finalQuery"`
-		UnexpectedIPs StringList `json:"unexpectedIPs"`
+		Address         *Address   `json:"address"`
+		ClientIP        *Address   `json:"clientIp"`
+		Port            uint16     `json:"port"`
+		SkipFallback    bool       `json:"skipFallback"`
+		Domains         []string   `json:"domains"`
+		ExpectedIPs     StringList `json:"expectedIPs"`
+		ExpectIPs       StringList `json:"expectIPs"`
+		QueryStrategy   string     `json:"queryStrategy"`
+		Tag             string     `json:"tag"`
+		TimeoutMs       uint64     `json:"timeoutMs"`
+		DisableCache    *bool      `json:"disableCache"`
+		ServeStale      *bool      `json:"serveStale"`
+		ServeExpiredTTL *uint32    `json:"serveExpiredTTL"`
+		FinalQuery      bool       `json:"finalQuery"`
+		UnexpectedIPs   StringList `json:"unexpectedIPs"`
 	}
 	if err := json.Unmarshal(data, &advanced); err == nil {
 		c.Address = advanced.Address
@@ -66,6 +70,8 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 		c.Tag = advanced.Tag
 		c.TimeoutMs = advanced.TimeoutMs
 		c.DisableCache = advanced.DisableCache
+		c.ServeStale = advanced.ServeStale
+		c.ServeExpiredTTL = advanced.ServeExpiredTTL
 		c.FinalQuery = advanced.FinalQuery
 		c.UnexpectedIPs = advanced.UnexpectedIPs
 		return nil
@@ -173,6 +179,8 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 		Tag:               c.Tag,
 		TimeoutMs:         c.TimeoutMs,
 		DisableCache:      c.DisableCache,
+		ServeStale:        c.ServeStale,
+		ServeExpiredTTL:   c.ServeExpiredTTL,
 		FinalQuery:        c.FinalQuery,
 		UnexpectedGeoip:   unexpectedGeoipList,
 		ActUnprior:        actUnprior,
@@ -194,8 +202,11 @@ type DNSConfig struct {
 	Tag                    string              `json:"tag"`
 	QueryStrategy          string              `json:"queryStrategy"`
 	DisableCache           bool                `json:"disableCache"`
+	ServeStale             bool                `json:"serveStale"`
+	ServeExpiredTTL        uint32              `json:"serveExpiredTTL"`
 	DisableFallback        bool                `json:"disableFallback"`
 	DisableFallbackIfMatch bool                `json:"disableFallbackIfMatch"`
+	EnableParallelQuery    bool                `json:"enableParallelQuery"`
 	UseSystemHosts         bool                `json:"useSystemHosts"`
 }
 
@@ -391,8 +402,11 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
 	config := &dns.Config{
 		Tag:                    c.Tag,
 		DisableCache:           c.DisableCache,
+		ServeStale:             c.ServeStale,
+		ServeExpiredTTL:        c.ServeExpiredTTL,
 		DisableFallback:        c.DisableFallback,
 		DisableFallbackIfMatch: c.DisableFallbackIfMatch,
+		EnableParallelQuery:    c.EnableParallelQuery,
 		QueryStrategy:          resolveQueryStrategy(c.QueryStrategy),
 	}
 
@@ -403,11 +417,78 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
 		config.ClientIp = []byte(c.ClientIP.IP())
 	}
 
+	// Build PolicyID
+	policyMap := map[string]uint32{}
+	nextPolicyID := uint32(1)
+	buildPolicyID := func(nsc *NameServerConfig) uint32 {
+		var sb strings.Builder
+
+		// ClientIP
+		if nsc.ClientIP != nil {
+			sb.WriteString("client=")
+			sb.WriteString(nsc.ClientIP.String())
+			sb.WriteByte('|')
+		} else {
+			sb.WriteString("client=none|")
+		}
+
+		// SkipFallback
+		if nsc.SkipFallback {
+			sb.WriteString("skip=1|")
+		} else {
+			sb.WriteString("skip=0|")
+		}
+
+		// QueryStrategy
+		sb.WriteString("qs=")
+		sb.WriteString(strings.ToLower(strings.TrimSpace(nsc.QueryStrategy)))
+		sb.WriteByte('|')
+
+		// Tag
+		sb.WriteString("tag=")
+		sb.WriteString(strings.ToLower(strings.TrimSpace(nsc.Tag)))
+		sb.WriteByte('|')
+
+		// []string helper
+		writeList := func(tag string, lst []string) {
+			if len(lst) == 0 {
+				sb.WriteString(tag)
+				sb.WriteString("=[]|")
+				return
+			}
+			cp := make([]string, len(lst))
+			for i, s := range lst {
+				cp[i] = strings.TrimSpace(strings.ToLower(s))
+			}
+			sort.Strings(cp)
+			sb.WriteString(tag)
+			sb.WriteByte('=')
+			sb.WriteString(strings.Join(cp, ","))
+			sb.WriteByte('|')
+		}
+
+		writeList("domains", nsc.Domains)
+		writeList("expected", nsc.ExpectedIPs)
+		writeList("expect", nsc.ExpectIPs)
+		writeList("unexpected", nsc.UnexpectedIPs)
+
+		key := sb.String()
+
+		if id, ok := policyMap[key]; ok {
+			return id
+		}
+		id := nextPolicyID
+		nextPolicyID++
+		policyMap[key] = id
+		return id
+	}
+
 	for _, server := range c.Servers {
 		ns, err := server.Build()
 		if err != nil {
 			return nil, errors.New("failed to build nameserver").Base(err)
 		}
+		ns.PolicyID = buildPolicyID(server)
 		config.NameServer = append(config.NameServer, ns)
 	}
 

infra/conf/dns_test.go

@@ -20,7 +20,8 @@ func TestDNSConfigParsing(t *testing.T) {
 			return config.Build()
 		}
 	}
-
+	expectedServeStale := true
+	expectedServeExpiredTTL := uint32(172800)
 	runMultiTestCase(t, []TestCase{
 		{
 			Input: `{
@@ -28,7 +29,9 @@ func TestDNSConfigParsing(t *testing.T) {
 					"address": "8.8.8.8",
 					"port": 5353,
 					"skipFallback": true,
-					"domains": ["domain:example.com"]
+					"domains": ["domain:example.com"],
+					"serveStale": true,
+					"serveExpiredTTL": 172800
 				}],
 				"hosts": {
 					"domain:example.com": "google.com",
@@ -40,6 +43,8 @@ func TestDNSConfigParsing(t *testing.T) {
 				"clientIp": "10.0.0.1",
 				"queryStrategy": "UseIPv4",
 				"disableCache": true,
+				"serveStale": false,
+				"serveExpiredTTL": 86400,
 				"disableFallback": true
 			}`,
 			Parser: parserCreator(),
@@ -68,6 +73,9 @@ func TestDNSConfigParsing(t *testing.T) {
 								Size: 1,
 							},
 						},
+						ServeStale:      &expectedServeStale,
+						ServeExpiredTTL: &expectedServeExpiredTTL,
+						PolicyID:        1, // Servers with certain identical fields share this ID, incrementing starting from 1. See: Build PolicyID
 					},
 				},
 				StaticHosts: []*dns.Config_HostMapping{
@@ -100,6 +108,8 @@ func TestDNSConfigParsing(t *testing.T) {
 				ClientIp:        []byte{10, 0, 0, 1},
 				QueryStrategy:   dns.QueryStrategy_USE_IP4,
 				DisableCache:    true,
+				ServeStale:      false,
+				ServeExpiredTTL: 86400,
 				DisableFallback: true,
 			},
 		},

infra/conf/router.go

@@ -83,8 +83,6 @@ func (c *RouterConfig) getDomainStrategy() router.Config_DomainStrategy {
 	}
 
 	switch strings.ToLower(ds) {
-	case "alwaysip":
-		return router.Config_UseIp
 	case "ipifnonmatch":
 		return router.Config_IpIfNonMatch
 	case "ipondemand":

infra/conf/transport_internet.go

@@ -628,6 +628,9 @@ func (c *REALITYConfig) Build() (proto.Message, error) {
 		}
 		config.ShortIds = make([][]byte, len(c.ShortIds))
 		for i, s := range c.ShortIds {
+			if len(s) > 16 {
+				return nil, errors.New(`too long "shortIds[`, i, `]": `, s)
+			}
 			config.ShortIds[i] = make([]byte, 8)
 			if _, err = hex.Decode(config.ShortIds[i], []byte(s)); err != nil {
 				return nil, errors.New(`invalid "shortIds[`, i, `]": `, s)
@@ -679,6 +682,9 @@ func (c *REALITYConfig) Build() (proto.Message, error) {
 		if len(c.ShortIds) != 0 {
 			return nil, errors.New(`non-empty "shortIds", please use "shortId" instead`)
 		}
+		if len(c.ShortIds) > 16 {
+			return nil, errors.New(`too long "shortId": `, c.ShortId)
+		}
 		config.ShortId = make([]byte, 8)
 		if _, err = hex.Decode(config.ShortId, []byte(c.ShortId)); err != nil {
 			return nil, errors.New(`invalid "shortId": `, c.ShortId)
@@ -804,6 +810,7 @@ type SocketConfig struct {
 	CustomSockopt         []*CustomSockoptConfig `json:"customSockopt"`
 	AddressPortStrategy   string                 `json:"addressPortStrategy"`
 	HappyEyeballsSettings *HappyEyeballsConfig   `json:"happyEyeballs"`
+	TrustedXForwardedFor  []string               `json:"trustedXForwardedFor"`
 }
 
 // Build implements Buildable.
@@ -923,6 +930,7 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 		CustomSockopt:        customSockopts,
 		AddressPortStrategy:  addressPortStrategy,
 		HappyEyeballs:        happyEyeballs,
+		TrustedXForwardedFor: c.TrustedXForwardedFor,
 	}, nil
 }
 

infra/conf/vless.go

@@ -34,6 +34,7 @@ type VLessInboundConfig struct {
 	Decryption string                  `json:"decryption"`
 	Fallbacks  []*VLessInboundFallback `json:"fallbacks"`
 	Flow       string                  `json:"flow"`
+	Testseed   []uint32                `json:"testseed"`
 }
 
 // Build implements Buildable
@@ -73,6 +74,10 @@ func (c *VLessInboundConfig) Build() (proto.Message, error) {
 			return nil, errors.New(`VLESS clients: "flow" doesn't support "` + account.Flow + `" in this version`)
 		}
 
+		if len(account.Testseed) < 4 {
+			account.Testseed = c.Testseed
+		}
+
 		if account.Encryption != "" {
 			return nil, errors.New(`VLESS clients: "encryption" should not be in inbound settings`)
 		}
@@ -212,6 +217,8 @@ type VLessOutboundConfig struct {
 	Seed       string                `json:"seed"`
 	Encryption string                `json:"encryption"`
 	Reverse    *vless.Reverse        `json:"reverse"`
+	Testpre    uint32                `json:"testpre"`
+	Testseed   []uint32              `json:"testseed"`
 	Vnext      []*VLessOutboundVnext `json:"vnext"`
 }
 
@@ -258,6 +265,8 @@ func (c *VLessOutboundConfig) Build() (proto.Message, error) {
 				//account.Seed = c.Seed
 				account.Encryption = c.Encryption
 				account.Reverse = c.Reverse
+				account.Testpre = c.Testpre
+				account.Testseed = c.Testseed
 			} else {
 				if err := json.Unmarshal(rawUser, account); err != nil {
 					return nil, errors.New(`VLESS users: invalid user`).Base(err)

infra/conf/xray.go

@@ -3,8 +3,6 @@ package conf
 import (
 	"context"
 	"encoding/json"
-	"log"
-	"os"
 	"path/filepath"
 	"strings"
 
@@ -47,8 +45,6 @@ var (
 		"dns":         func() interface{} { return new(DNSOutboundConfig) },
 		"wireguard":   func() interface{} { return &WireGuardConfig{IsClient: true} },
 	}, "protocol", "settings")
-
-	ctllog = log.New(os.Stderr, "xctl> ", 0)
 )
 
 type SniffingConfig struct {

main/commands/all/convert/protobuf.go

@@ -3,7 +3,6 @@ package convert
 import (
 	"fmt"
 	"os"
-	"strings"
 
 	"github.com/xtls/xray-core/common/cmdarg"
 	creflect "github.com/xtls/xray-core/common/reflect"
@@ -61,7 +60,7 @@ func executeConvertConfigsToProtobuf(cmd *base.Command, args []string) {
 	}
 
 	if len(optFile) > 0 {
-		switch core.GetFormatByExtension(getFileExtension(optFile)){
+		switch core.GetFormat(optFile){
 		case "protobuf", "":
 			fmt.Println("Output ProtoBuf file is ", optFile)
 		default:
@@ -106,11 +105,3 @@ func executeConvertConfigsToProtobuf(cmd *base.Command, args []string) {
 		}
 	}
 }
-
-func getFileExtension(filename string) string {
-	idx := strings.LastIndexByte(filename, '.')
-	if idx == -1 {
-		return ""
-	}
-	return filename[idx+1:]
-}

main/confloader/confloader.go

@@ -10,12 +10,10 @@ import (
 
 type (
 	configFileLoader func(string) (io.Reader, error)
-	extconfigLoader  func([]string, io.Reader) (io.Reader, error)
 )
 
 var (
 	EffectiveConfigFileLoader configFileLoader
-	EffectiveExtConfigLoader  extconfigLoader
 )
 
 // LoadConfig reads from a path/url/stdin
@@ -27,13 +25,3 @@ func LoadConfig(file string) (io.Reader, error) {
 	}
 	return EffectiveConfigFileLoader(file)
 }
-
-// LoadExtConfig calls xctl to handle multiple config
-// the actual work also in external module
-func LoadExtConfig(files []string, reader io.Reader) (io.Reader, error) {
-	if EffectiveExtConfigLoader == nil {
-		return nil, errors.New("external config module not loaded").AtError()
-	}
-
-	return EffectiveExtConfigLoader(files, reader)
-}

main/confloader/external/external.go

@@ -13,7 +13,6 @@ import (
 
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/platform/ctlcmd"
 	"github.com/xtls/xray-core/main/confloader"
 )
 
@@ -129,16 +128,6 @@ func FetchUnixSocketHTTPContent(target string) ([]byte, error) {
 	return content, nil
 }
 
-func ExtConfigLoader(files []string, reader io.Reader) (io.Reader, error) {
-	buf, err := ctlcmd.Run(append([]string{"convert"}, files...), reader)
-	if err != nil {
-		return nil, err
-	}
-
-	return strings.NewReader(buf.String()), nil
-}
-
 func init() {
 	confloader.EffectiveConfigFileLoader = ConfigLoader
-	confloader.EffectiveExtConfigLoader = ExtConfigLoader
 }

proxy/http/client.go

@@ -308,6 +308,12 @@ func setUpHTTPTunnel(ctx context.Context, dest net.Destination, target string, u
 			return nil, err
 		}
 		nextProto = tlsConn.ConnectionState().NegotiatedProtocol
+	} else if tlsConn, ok := iConn.(*tls.UConn); ok {
+		if err := tlsConn.HandshakeContext(ctx); err != nil {
+			rawConn.Close()
+			return nil, err
+		}
+		nextProto = tlsConn.ConnectionState().NegotiatedProtocol
 	}
 
 	switch nextProto {

proxy/proxy.go

@@ -248,7 +248,7 @@ func (w *VisionReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 			*withinPaddingBuffers = false
 			*switchToDirectCopy = true
 		} else {
-			errors.LogInfo(w.ctx, "XtlsRead unknown command ", *currentCommand, buffer.Len())
+			errors.LogDebug(w.ctx, "XtlsRead unknown command ", *currentCommand, buffer.Len())
 		}
 	}
 	if w.trafficState.NumberOfPacketToFilter > 0 {
@@ -269,9 +269,9 @@ func (w *VisionReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 		w.rawInput = nil
 
 		if inbound := session.InboundFromContext(w.ctx); inbound != nil && inbound.Conn != nil {
-			if w.isUplink && inbound.CanSpliceCopy == 2 {
-				inbound.CanSpliceCopy = 1
-			}
+			// if w.isUplink && inbound.CanSpliceCopy == 2 { // TODO: enable uplink splice
+			// 	inbound.CanSpliceCopy = 1
+			// }
 			if !w.isUplink && w.ob != nil && w.ob.CanSpliceCopy == 2 { // ob need to be passed in due to context can have more than one ob
 				w.ob.CanSpliceCopy = 1
 			}
@@ -296,11 +296,16 @@ type VisionWriter struct {
 	// internal
 	writeOnceUserUUID  []byte
 	directWriteCounter stats.Counter
+
+	testseed []uint32
 }
 
-func NewVisionWriter(writer buf.Writer, trafficState *TrafficState, isUplink bool, ctx context.Context, conn net.Conn, ob *session.Outbound) *VisionWriter {
+func NewVisionWriter(writer buf.Writer, trafficState *TrafficState, isUplink bool, ctx context.Context, conn net.Conn, ob *session.Outbound, testseed []uint32) *VisionWriter {
 	w := make([]byte, len(trafficState.UserUUID))
 	copy(w, trafficState.UserUUID)
+	if len(testseed) < 4 {
+		testseed = []uint32{900, 500, 900, 256}
+	}
 	return &VisionWriter{
 		Writer:            writer,
 		trafficState:      trafficState,
@@ -309,6 +314,7 @@ func NewVisionWriter(writer buf.Writer, trafficState *TrafficState, isUplink boo
 		isUplink:          isUplink,
 		conn:              conn,
 		ob:                ob,
+		testseed:          testseed,
 	}
 }
 
@@ -328,9 +334,9 @@ func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 			if !w.isUplink && inbound.CanSpliceCopy == 2 {
 				inbound.CanSpliceCopy = 1
 			}
-			if w.isUplink && w.ob != nil && w.ob.CanSpliceCopy == 2 {
-				w.ob.CanSpliceCopy = 1
-			}
+			// if w.isUplink && w.ob != nil && w.ob.CanSpliceCopy == 2 { // TODO: enable uplink splice
+			// 	w.ob.CanSpliceCopy = 1
+			// }
 		}
 		rawConn, _, writerCounter := UnwrapRawConn(w.conn)
 		w.Writer = buf.NewWriter(rawConn)
@@ -347,13 +353,14 @@ func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 
 	if *isPadding {
 		if len(mb) == 1 && mb[0] == nil {
-			mb[0] = XtlsPadding(nil, CommandPaddingContinue, &w.writeOnceUserUUID, true, w.ctx) // we do a long padding to hide vless header
+			mb[0] = XtlsPadding(nil, CommandPaddingContinue, &w.writeOnceUserUUID, true, w.ctx, w.testseed) // we do a long padding to hide vless header
 			return w.Writer.WriteMultiBuffer(mb)
 		}
+		isComplete := IsCompleteRecord(mb)
 		mb = ReshapeMultiBuffer(w.ctx, mb)
 		longPadding := w.trafficState.IsTLS
 		for i, b := range mb {
-			if w.trafficState.IsTLS && b.Len() >= 6 && bytes.Equal(TlsApplicationDataStart, b.BytesTo(3)) {
+			if w.trafficState.IsTLS && b.Len() >= 6 && bytes.Equal(TlsApplicationDataStart, b.BytesTo(3)) && isComplete {
 				if w.trafficState.EnableXtls {
 					*switchToDirectCopy = true
 				}
@@ -364,13 +371,13 @@ func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 						command = CommandPaddingDirect
 					}
 				}
-				mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, true, w.ctx)
+				mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, true, w.ctx, w.testseed)
 				*isPadding = false // padding going to end
 				longPadding = false
 				continue
 			} else if !w.trafficState.IsTLS12orAbove && w.trafficState.NumberOfPacketToFilter <= 1 { // For compatibility with earlier vision receiver, we finish padding 1 packet early
 				*isPadding = false
-				mb[i] = XtlsPadding(b, CommandPaddingEnd, &w.writeOnceUserUUID, longPadding, w.ctx)
+				mb[i] = XtlsPadding(b, CommandPaddingEnd, &w.writeOnceUserUUID, longPadding, w.ctx, w.testseed)
 				break
 			}
 			var command byte = CommandPaddingContinue
@@ -380,12 +387,66 @@ func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 					command = CommandPaddingDirect
 				}
 			}
-			mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, longPadding, w.ctx)
+			mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, longPadding, w.ctx, w.testseed)
 		}
 	}
 	return w.Writer.WriteMultiBuffer(mb)
 }
 
+// IsCompleteRecord Is complete tls data record
+func IsCompleteRecord(buffer buf.MultiBuffer) bool {
+	b := make([]byte, buffer.Len())
+	if buffer.Copy(b) != int(buffer.Len()) {
+		panic("impossible bytes allocation")
+	}
+	var headerLen int = 5
+	var recordLen int
+
+	totalLen := len(b)
+	i := 0
+	for i < totalLen {
+		// record header: 0x17 0x3 0x3 + 2 bytes length
+		if headerLen > 0 {
+			data := b[i]
+			i++
+			switch headerLen {
+			case 5:
+				if data != 0x17 {
+					return false
+				}
+			case 4:
+				if data != 0x03 {
+					return false
+				}
+			case 3:
+				if data != 0x03 {
+					return false
+				}
+			case 2:
+				recordLen = int(data) << 8
+			case 1:
+				recordLen = recordLen | int(data)
+			}
+			headerLen--
+		} else if recordLen > 0 {
+			remaining := totalLen - i
+			if remaining < recordLen {
+				return false
+			} else {
+				i += recordLen
+				recordLen = 0
+				headerLen = 5
+			}
+		} else {
+			return false
+		}
+	}
+	if headerLen == 5 && recordLen == 0 {
+		return true
+	}
+	return false
+}
+
 // ReshapeMultiBuffer prepare multi buffer for padding structure (max 21 bytes)
 func ReshapeMultiBuffer(ctx context.Context, buffer buf.MultiBuffer) buf.MultiBuffer {
 	needReshape := 0
@@ -417,25 +478,25 @@ func ReshapeMultiBuffer(ctx context.Context, buffer buf.MultiBuffer) buf.MultiBu
 		buffer[i] = nil
 	}
 	buffer = buffer[:0]
-	errors.LogInfo(ctx, "ReshapeMultiBuffer ", toPrint)
+	errors.LogDebug(ctx, "ReshapeMultiBuffer ", toPrint)
 	return mb2
 }
 
 // XtlsPadding add padding to eliminate length signature during tls handshake
-func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool, ctx context.Context) *buf.Buffer {
+func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool, ctx context.Context, testseed []uint32) *buf.Buffer {
 	var contentLen int32 = 0
 	var paddingLen int32 = 0
 	if b != nil {
 		contentLen = b.Len()
 	}
-	if contentLen < 900 && longPadding {
-		l, err := rand.Int(rand.Reader, big.NewInt(500))
+	if contentLen < int32(testseed[0]) && longPadding {
+		l, err := rand.Int(rand.Reader, big.NewInt(int64(testseed[1])))
 		if err != nil {
 			errors.LogDebugInner(ctx, err, "failed to generate padding")
 		}
-		paddingLen = int32(l.Int64()) + 900 - contentLen
+		paddingLen = int32(l.Int64()) + int32(testseed[2]) - contentLen
 	} else {
-		l, err := rand.Int(rand.Reader, big.NewInt(256))
+		l, err := rand.Int(rand.Reader, big.NewInt(int64(testseed[3])))
 		if err != nil {
 			errors.LogDebugInner(ctx, err, "failed to generate padding")
 		}
@@ -456,7 +517,7 @@ func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool
 		b = nil
 	}
 	newbuffer.Extend(paddingLen)
-	errors.LogInfo(ctx, "XtlsPadding ", contentLen, " ", paddingLen, " ", command)
+	errors.LogDebug(ctx, "XtlsPadding ", contentLen, " ", paddingLen, " ", command)
 	return newbuffer
 }
 
@@ -503,7 +564,7 @@ func XtlsUnpadding(b *buf.Buffer, s *TrafficState, isUplink bool, ctx context.Co
 				*remainingPadding = int32(data) << 8
 			case 1:
 				*remainingPadding = *remainingPadding | int32(data)
-				errors.LogInfo(ctx, "Xtls Unpadding new block, content ", *remainingContent, " padding ", *remainingPadding, " command ", *currentCommand)
+				errors.LogDebug(ctx, "Xtls Unpadding new block, content ", *remainingContent, " padding ", *remainingPadding, " command ", *currentCommand)
 			}
 			*remainingCommand--
 		} else if *remainingContent > 0 {
@@ -562,11 +623,11 @@ func XtlsFilterTls(buffer buf.MultiBuffer, trafficState *TrafficState, ctx conte
 					cipherSuite := b.BytesRange(43+sessionIdLen+1, 43+sessionIdLen+3)
 					trafficState.Cipher = uint16(cipherSuite[0])<<8 | uint16(cipherSuite[1])
 				} else {
-					errors.LogInfo(ctx, "XtlsFilterTls short server hello, tls 1.2 or older? ", b.Len(), " ", trafficState.RemainingServerHello)
+					errors.LogDebug(ctx, "XtlsFilterTls short server hello, tls 1.2 or older? ", b.Len(), " ", trafficState.RemainingServerHello)
 				}
 			} else if bytes.Equal(TlsClientHandShakeStart, startsBytes[:2]) && startsBytes[5] == TlsHandshakeTypeClientHello {
 				trafficState.IsTLS = true
-				errors.LogInfo(ctx, "XtlsFilterTls found tls client hello! ", buffer.Len())
+				errors.LogDebug(ctx, "XtlsFilterTls found tls client hello! ", buffer.Len())
 			}
 		}
 		if trafficState.RemainingServerHello > 0 {
@@ -582,18 +643,18 @@ func XtlsFilterTls(buffer buf.MultiBuffer, trafficState *TrafficState, ctx conte
 				} else if v != "TLS_AES_128_CCM_8_SHA256" {
 					trafficState.EnableXtls = true
 				}
-				errors.LogInfo(ctx, "XtlsFilterTls found tls 1.3! ", b.Len(), " ", v)
+				errors.LogDebug(ctx, "XtlsFilterTls found tls 1.3! ", b.Len(), " ", v)
 				trafficState.NumberOfPacketToFilter = 0
 				return
 			} else if trafficState.RemainingServerHello <= 0 {
-				errors.LogInfo(ctx, "XtlsFilterTls found tls 1.2! ", b.Len())
+				errors.LogDebug(ctx, "XtlsFilterTls found tls 1.2! ", b.Len())
 				trafficState.NumberOfPacketToFilter = 0
 				return
 			}
-			errors.LogInfo(ctx, "XtlsFilterTls inconclusive server hello ", b.Len(), " ", trafficState.RemainingServerHello)
+			errors.LogDebug(ctx, "XtlsFilterTls inconclusive server hello ", b.Len(), " ", trafficState.RemainingServerHello)
 		}
 		if trafficState.NumberOfPacketToFilter <= 0 {
-			errors.LogInfo(ctx, "XtlsFilterTls stop filtering", buffer.Len())
+			errors.LogDebug(ctx, "XtlsFilterTls stop filtering", buffer.Len())
 		}
 	}
 }
@@ -675,7 +736,7 @@ func CopyRawConnIfExist(ctx context.Context, readerConn net.Conn, writerConn net
 			}
 		}
 		if splice {
-			errors.LogInfo(ctx, "CopyRawConn splice")
+			errors.LogDebug(ctx, "CopyRawConn splice")
 			statWriter, _ := writer.(*dispatcher.SizeStatWriter)
 			//runtime.Gosched() // necessary
 			time.Sleep(time.Millisecond)     // without this, there will be a rare ssl error for freedom splice
@@ -718,7 +779,7 @@ func CopyRawConnIfExist(ctx context.Context, readerConn net.Conn, writerConn net
 }
 
 func readV(ctx context.Context, reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, readCounter stats.Counter) error {
-	errors.LogInfo(ctx, "CopyRawConn (maybe) readv")
+	errors.LogDebug(ctx, "CopyRawConn (maybe) readv")
 	if err := buf.Copy(reader, writer, buf.UpdateActivity(timer), buf.AddToStatCounter(readCounter)); err != nil {
 		return errors.New("failed to process response").Base(err)
 	}

proxy/socks/protocol.go

@@ -353,6 +353,11 @@ func EncodeUDPPacket(request *protocol.RequestHeader, data []byte) (*buf.Buffer,
 		b.Release()
 		return nil, err
 	}
+	// if data is too large, return an empty buffer (drop too big data)
+	if b.Available() < int32(len(data)) {
+		b.Clear()
+		return b, nil
+	}
 	common.Must2(b.Write(data))
 	return b, nil
 }

proxy/vless/account.go

@@ -22,6 +22,8 @@ func (a *Account) AsAccount() (protocol.Account, error) {
 		Seconds:    a.Seconds,
 		Padding:    a.Padding,
 		Reverse:    a.Reverse,
+		Testpre:    a.Testpre,
+		Testseed:   a.Testseed,
 	}, nil
 }
 
@@ -38,6 +40,9 @@ type MemoryAccount struct {
 	Padding    string
 
 	Reverse *Reverse
+
+	Testpre  uint32
+	Testseed []uint32
 }
 
 // Equals implements protocol.Account.Equals().
@@ -58,5 +63,7 @@ func (a *MemoryAccount) ToProto() proto.Message {
 		Seconds:    a.Seconds,
 		Padding:    a.Padding,
 		Reverse:    a.Reverse,
+		Testpre:    a.Testpre,
+		Testseed:   a.Testseed,
 	}
 }

proxy/vless/account.pb.go

@@ -79,6 +79,8 @@ type Account struct {
 	Seconds    uint32   `protobuf:"varint,5,opt,name=seconds,proto3" json:"seconds,omitempty"`
 	Padding    string   `protobuf:"bytes,6,opt,name=padding,proto3" json:"padding,omitempty"`
 	Reverse    *Reverse `protobuf:"bytes,7,opt,name=reverse,proto3" json:"reverse,omitempty"`
+	Testpre    uint32   `protobuf:"varint,8,opt,name=testpre,proto3" json:"testpre,omitempty"`
+	Testseed   []uint32 `protobuf:"varint,9,rep,packed,name=testseed,proto3" json:"testseed,omitempty"`
 }
 
 func (x *Account) Reset() {
@@ -160,6 +162,20 @@ func (x *Account) GetReverse() *Reverse {
 	return nil
 }
 
+func (x *Account) GetTestpre() uint32 {
+	if x != nil {
+		return x.Testpre
+	}
+	return 0
+}
+
+func (x *Account) GetTestseed() []uint32 {
+	if x != nil {
+		return x.Testseed
+	}
+	return nil
+}
+
 var File_proxy_vless_account_proto protoreflect.FileDescriptor
 
 var file_proxy_vless_account_proto_rawDesc = []byte{
@@ -167,7 +183,7 @@ var file_proxy_vless_account_proto_rawDesc = []byte{
 	0x63, 0x6f, 0x75, 0x6e, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x10, 0x78, 0x72, 0x61,
 	0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x76, 0x6c, 0x65, 0x73, 0x73, 0x22, 0x1b, 0x0a,
 	0x07, 0x52, 0x65, 0x76, 0x65, 0x72, 0x73, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x74, 0x61, 0x67, 0x18,
-	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x74, 0x61, 0x67, 0x22, 0xd0, 0x01, 0x0a, 0x07, 0x41,
+	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x74, 0x61, 0x67, 0x22, 0x86, 0x02, 0x0a, 0x07, 0x41,
 	0x63, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01,
 	0x28, 0x09, 0x52, 0x02, 0x69, 0x64, 0x12, 0x12, 0x0a, 0x04, 0x66, 0x6c, 0x6f, 0x77, 0x18, 0x02,
 	0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x66, 0x6c, 0x6f, 0x77, 0x12, 0x1e, 0x0a, 0x0a, 0x65, 0x6e,
@@ -180,13 +196,16 @@ var file_proxy_vless_account_proto_rawDesc = []byte{
 	0x07, 0x70, 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67, 0x12, 0x33, 0x0a, 0x07, 0x72, 0x65, 0x76, 0x65,
 	0x72, 0x73, 0x65, 0x18, 0x07, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x19, 0x2e, 0x78, 0x72, 0x61, 0x79,
 	0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x76, 0x6c, 0x65, 0x73, 0x73, 0x2e, 0x52, 0x65, 0x76,
-	0x65, 0x72, 0x73, 0x65, 0x52, 0x07, 0x72, 0x65, 0x76, 0x65, 0x72, 0x73, 0x65, 0x42, 0x52, 0x0a,
-	0x14, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e,
-	0x76, 0x6c, 0x65, 0x73, 0x73, 0x50, 0x01, 0x5a, 0x25, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
-	0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f,
-	0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2f, 0x76, 0x6c, 0x65, 0x73, 0x73, 0xaa, 0x02,
-	0x10, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x56, 0x6c, 0x65, 0x73,
-	0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x65, 0x72, 0x73, 0x65, 0x52, 0x07, 0x72, 0x65, 0x76, 0x65, 0x72, 0x73, 0x65, 0x12, 0x18, 0x0a,
+	0x07, 0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x65, 0x18, 0x08, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x07,
+	0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x65, 0x12, 0x1a, 0x0a, 0x08, 0x74, 0x65, 0x73, 0x74, 0x73,
+	0x65, 0x65, 0x64, 0x18, 0x09, 0x20, 0x03, 0x28, 0x0d, 0x52, 0x08, 0x74, 0x65, 0x73, 0x74, 0x73,
+	0x65, 0x65, 0x64, 0x42, 0x52, 0x0a, 0x14, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
+	0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x76, 0x6c, 0x65, 0x73, 0x73, 0x50, 0x01, 0x5a, 0x25, 0x67,
+	0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78,
+	0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2f, 0x76,
+	0x6c, 0x65, 0x73, 0x73, 0xaa, 0x02, 0x10, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x78,
+	0x79, 0x2e, 0x56, 0x6c, 0x65, 0x73, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

proxy/vless/account.proto

@@ -22,4 +22,7 @@ message Account {
   string padding = 6;
 
   Reverse reverse = 7;
+
+  uint32 testpre = 8;
+  repeated uint32 testseed = 9;
 }

proxy/vless/encoding/addons.go

@@ -68,7 +68,7 @@ func EncodeBodyAddons(writer buf.Writer, request *protocol.RequestHeader, reques
 		return NewMultiLengthPacketWriter(writer)
 	}
 	if requestAddons.Flow == vless.XRV {
-		return proxy.NewVisionWriter(writer, state, isUplink, context, conn, ob)
+		return proxy.NewVisionWriter(writer, state, isUplink, context, conn, ob, request.User.Account.(*vless.MemoryAccount).Testseed)
 	}
 	return writer
 }

proxy/vless/inbound/inbound.go

@@ -12,7 +12,6 @@ import (
 	"time"
 	"unsafe"
 
-	"github.com/xtls/xray-core/app/dispatcher"
 	"github.com/xtls/xray-core/app/reverse"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
@@ -76,7 +75,7 @@ type Handler struct {
 	validator              vless.Validator
 	decryption             *encryption.ServerInstance
 	outboundHandlerManager outbound.Manager
-	defaultDispatcher      *dispatcher.DefaultDispatcher
+	wrapLink               func(ctx context.Context, link *transport.Link) *transport.Link
 	ctx                    context.Context
 	fallbacks              map[string]map[string]map[string]*Fallback // or nil
 	// regexps               map[string]*regexp.Regexp       // or nil
@@ -85,12 +84,16 @@ type Handler struct {
 // New creates a new VLess inbound handler.
 func New(ctx context.Context, config *Config, dc dns.Client, validator vless.Validator) (*Handler, error) {
 	v := core.MustFromContext(ctx)
+	var wrapLinkFunc func(ctx context.Context, link *transport.Link) *transport.Link
+	if dispatcher, ok := v.GetFeature(routing.DispatcherType()).(routing.WrapLinkDispatcher); ok {
+		wrapLinkFunc = dispatcher.WrapLink
+	}
 	handler := &Handler{
 		inboundHandlerManager:  v.GetFeature(feature_inbound.ManagerType()).(feature_inbound.Manager),
 		policyManager:          v.GetFeature(policy.ManagerType()).(policy.Manager),
 		validator:              validator,
 		outboundHandlerManager: v.GetFeature(outbound.ManagerType()).(outbound.Manager),
-		defaultDispatcher:      v.GetFeature(routing.DispatcherType()).(*dispatcher.DefaultDispatcher),
+		wrapLink:               wrapLinkFunc,
 		ctx:                    ctx,
 	}
 
@@ -535,6 +538,10 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 
 	account := request.User.Account.(*vless.MemoryAccount)
 
+	if account.Reverse != nil && request.Command != protocol.RequestCommandRvs {
+		return errors.New("for safety reasons, user " + account.ID.String() + " is not allowed to use forward proxy")
+	}
+
 	responseAddons := &encoding.Addons{
 		// Flow: requestAddons.Flow,
 	}
@@ -619,7 +626,10 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 		if err != nil {
 			return err
 		}
-		return r.NewMux(ctx, h.defaultDispatcher.WrapLink(ctx, &transport.Link{Reader: clientReader, Writer: clientWriter}))
+		if h.wrapLink == nil {
+			return errors.New("VLESS reverse must have a dispatcher that implemented routing.WrapLinkDispatcher")
+		}
+		return r.NewMux(ctx, h.wrapLink(ctx, &transport.Link{Reader: clientReader, Writer: clientWriter}))
 	}
 
 	if err := dispatcher.DispatchLink(ctx, request.Destination(), &transport.Link{

proxy/vless/outbound/outbound.go

@@ -7,6 +7,7 @@ import (
 	"encoding/base64"
 	"reflect"
 	"strings"
+	"sync"
 	"time"
 	"unsafe"
 
@@ -15,6 +16,7 @@ import (
 	"github.com/xtls/xray-core/app/reverse"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
+	xctx "github.com/xtls/xray-core/common/ctx"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/mux"
 	"github.com/xtls/xray-core/common/net"
@@ -52,6 +54,15 @@ type Handler struct {
 	cone          bool
 	encryption    *encryption.ClientInstance
 	reverse       *Reverse
+
+	testpre  uint32
+	initpre  sync.Once
+	preConns chan *ConnExpire
+}
+
+type ConnExpire struct {
+	Conn   stat.Connection
+	Expire time.Time
 }
 
 // New creates a new VLess outbound handler.
@@ -105,11 +116,16 @@ func New(ctx context.Context, config *Config) (*Handler, error) {
 		}()
 	}
 
+	handler.testpre = a.Testpre
+
 	return handler, nil
 }
 
 // Close implements common.Closable.Close().
 func (h *Handler) Close() error {
+	if h.preConns != nil {
+		close(h.preConns)
+	}
 	if h.reverse != nil {
 		return h.reverse.Close()
 	}
@@ -128,18 +144,54 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	rec := h.server
 	var conn stat.Connection
 
-	if err := retry.ExponentialBackoff(5, 200).On(func() error {
-		var err error
-		conn, err = dialer.Dial(ctx, rec.Destination)
-		if err != nil {
-			return err
+	if h.testpre > 0 && h.reverse == nil {
+		h.initpre.Do(func() {
+			h.preConns = make(chan *ConnExpire)
+			for range h.testpre { // TODO: randomize
+				go func() {
+					defer func() { recover() }()
+					ctx := xctx.ContextWithID(context.Background(), session.NewID())
+					for {
+						conn, err := dialer.Dial(ctx, rec.Destination)
+						if err != nil {
+							errors.LogWarningInner(ctx, err, "pre-connect failed")
+							continue
+						}
+						h.preConns <- &ConnExpire{Conn: conn, Expire: time.Now().Add(time.Minute * 2)} // TODO: customize & randomize
+						time.Sleep(time.Millisecond * 200)                                             // TODO: customize & randomize
+					}
+				}()
+			}
+		})
+		for {
+			connTime := <-h.preConns
+			if connTime == nil {
+				return errors.New("closed handler").AtWarning()
+			}
+			if time.Now().Before(connTime.Expire) {
+				conn = connTime.Conn
+				break
+			}
+			connTime.Conn.Close()
+		}
+	}
+
+	if conn == nil {
+		if err := retry.ExponentialBackoff(5, 200).On(func() error {
+			var err error
+			conn, err = dialer.Dial(ctx, rec.Destination)
+			if err != nil {
+				return err
+			}
+			return nil
+		}); err != nil {
+			return errors.New("failed to find an available destination").Base(err).AtWarning()
 		}
-		return nil
-	}); err != nil {
-		return errors.New("failed to find an available destination").Base(err).AtWarning()
 	}
 	defer conn.Close()
 
+	ob.Conn = conn // for Vision's pre-connect
+
 	iConn := conn
 	if statConn, ok := iConn.(*stat.CounterConnection); ok {
 		iConn = statConn.Connection

proxy/wireguard/bind.go

@@ -3,15 +3,13 @@ package wireguard
 import (
 	"context"
 	"errors"
-	"io"
-	"net"
 	"net/netip"
 	"strconv"
 	"sync"
 
 	"golang.zx2c4.com/wireguard/conn"
 
-	xnet "github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/transport/internet"
 )
@@ -52,21 +50,21 @@ func (n *netBind) ParseEndpoint(s string) (conn.Endpoint, error) {
 		return nil, err
 	}
 
-	addr := xnet.ParseAddress(ipStr)
-	if addr.Family() == xnet.AddressFamilyDomain {
+	addr := net.ParseAddress(ipStr)
+	if addr.Family() == net.AddressFamilyDomain {
 		ips, _, err := n.dns.LookupIP(addr.Domain(), n.dnsOption)
 		if err != nil {
 			return nil, err
 		} else if len(ips) == 0 {
 			return nil, dns.ErrEmptyResponse
 		}
-		addr = xnet.IPAddress(ips[0])
+		addr = net.IPAddress(ips[0])
 	}
 
-	dst := xnet.Destination{
+	dst := net.Destination{
 		Address: addr,
-		Port:    xnet.Port(portNum),
-		Network: xnet.Network_UDP,
+		Port:    net.Port(portNum),
+		Network: net.Network_UDP,
 	}
 
 	return &netEndpoint{
@@ -153,7 +151,7 @@ func (bind *netBindClient) connectTo(endpoint *netEndpoint) error {
 			v.endpoint = endpoint
 			v.err = err
 			v.waiter.Done()
-			if err != nil && errors.Is(err, io.EOF) {
+			if err != nil {
 				endpoint.conn = nil
 				return
 			}
@@ -215,7 +213,7 @@ func (bind *netBindServer) Send(buff [][]byte, endpoint conn.Endpoint) error {
 }
 
 type netEndpoint struct {
-	dst  xnet.Destination
+	dst  net.Destination
 	conn net.Conn
 }
 
@@ -248,7 +246,7 @@ func (e netEndpoint) SrcToString() string {
 	return ""
 }
 
-func toNetIpAddr(addr xnet.Address) netip.Addr {
+func toNetIpAddr(addr net.Address) netip.Addr {
 	if addr.Family().IsIPv4() {
 		ip := addr.IP()
 		return netip.AddrFrom4([4]byte{ip[0], ip[1], ip[2], ip[3]})

proxy/wireguard/tun.go

@@ -3,7 +3,6 @@ package wireguard
 import (
 	"context"
 	"fmt"
-	"net"
 	"net/netip"
 	"runtime"
 	"strconv"
@@ -13,7 +12,7 @@ import (
 
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/log"
-	xnet "github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/proxy/wireguard/gvisortun"
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
@@ -28,7 +27,7 @@ import (
 
 type tunCreator func(localAddresses []netip.Addr, mtu int, handler promiscuousModeHandler) (Tunnel, error)
 
-type promiscuousModeHandler func(dest xnet.Destination, conn net.Conn)
+type promiscuousModeHandler func(dest net.Destination, conn net.Conn)
 
 type Tunnel interface {
 	BuildDevice(ipc string, bind conn.Bind) error
@@ -169,7 +168,7 @@ func createGVisorTun(localAddresses []netip.Addr, mtu int, handler promiscuousMo
 				ep.SocketOptions().SetKeepAlive(true)
 
 				// local address is actually destination
-				handler(xnet.TCPDestination(xnet.IPAddress(id.LocalAddress.AsSlice()), xnet.Port(id.LocalPort)), gonet.NewTCPConn(&wq, ep))
+				handler(net.TCPDestination(net.IPAddress(id.LocalAddress.AsSlice()), net.Port(id.LocalPort)), gonet.NewTCPConn(&wq, ep))
 			}(r)
 		})
 		stack.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
@@ -194,7 +193,7 @@ func createGVisorTun(localAddresses []netip.Addr, mtu int, handler promiscuousMo
 					Timeout: 15 * time.Second,
 				})
 
-				handler(xnet.UDPDestination(xnet.IPAddress(id.LocalAddress.AsSlice()), xnet.Port(id.LocalPort)), gonet.NewUDPConn(&wq, ep))
+				handler(net.UDPDestination(net.IPAddress(id.LocalAddress.AsSlice()), net.Port(id.LocalPort)), gonet.NewUDPConn(&wq, ep))
 			}(r)
 		})
 		stack.SetTransportProtocolHandler(udp.ProtocolNumber, udpForwarder.HandlePacket)

transport/internet/config.pb.go

@@ -530,6 +530,7 @@ type SocketConfig struct {
 	CustomSockopt              []*CustomSockopt     `protobuf:"bytes,20,rep,name=customSockopt,proto3" json:"customSockopt,omitempty"`
 	AddressPortStrategy        AddressPortStrategy  `protobuf:"varint,21,opt,name=address_port_strategy,json=addressPortStrategy,proto3,enum=xray.transport.internet.AddressPortStrategy" json:"address_port_strategy,omitempty"`
 	HappyEyeballs              *HappyEyeballsConfig `protobuf:"bytes,22,opt,name=happy_eyeballs,json=happyEyeballs,proto3" json:"happy_eyeballs,omitempty"`
+	TrustedXForwardedFor       []string             `protobuf:"bytes,23,rep,name=trusted_x_forwarded_for,json=trustedXForwardedFor,proto3" json:"trusted_x_forwarded_for,omitempty"`
 }
 
 func (x *SocketConfig) Reset() {
@@ -716,6 +717,13 @@ func (x *SocketConfig) GetHappyEyeballs() *HappyEyeballsConfig {
 	return nil
 }
 
+func (x *SocketConfig) GetTrustedXForwardedFor() []string {
+	if x != nil {
+		return x.TrustedXForwardedFor
+	}
+	return nil
+}
+
 type HappyEyeballsConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -843,7 +851,7 @@ var file_transport_internet_config_proto_rawDesc = []byte{
 	0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6f, 0x70, 0x74, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61,
 	0x6c, 0x75, 0x65, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65,
 	0x12, 0x12, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x06, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04,
-	0x74, 0x79, 0x70, 0x65, 0x22, 0xd2, 0x08, 0x0a, 0x0c, 0x53, 0x6f, 0x63, 0x6b, 0x65, 0x74, 0x43,
+	0x74, 0x79, 0x70, 0x65, 0x22, 0x89, 0x09, 0x0a, 0x0c, 0x53, 0x6f, 0x63, 0x6b, 0x65, 0x74, 0x43,
 	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x6d, 0x61, 0x72, 0x6b, 0x18, 0x01, 0x20,
 	0x01, 0x28, 0x05, 0x52, 0x04, 0x6d, 0x61, 0x72, 0x6b, 0x12, 0x10, 0x0a, 0x03, 0x74, 0x66, 0x6f,
 	0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x74, 0x66, 0x6f, 0x12, 0x48, 0x0a, 0x06, 0x74,
@@ -909,48 +917,52 @@ var file_transport_internet_config_proto_rawDesc = []byte{
 	0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74,
 	0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x48, 0x61, 0x70, 0x70, 0x79, 0x45, 0x79, 0x65, 0x62, 0x61,
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-	0x78, 0x79, 0x4d, 0x6f, 0x64, 0x65, 0x12, 0x07, 0x0a, 0x03, 0x4f, 0x66, 0x66, 0x10, 0x00, 0x12,
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+	0x02, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x0a, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6c, 0x65, 0x61, 0x76,
+	0x65, 0x12, 0x1f, 0x0a, 0x0b, 0x74, 0x72, 0x79, 0x5f, 0x64, 0x65, 0x6c, 0x61, 0x79, 0x4d, 0x73,
+	0x18, 0x03, 0x20, 0x01, 0x28, 0x04, 0x52, 0x0a, 0x74, 0x72, 0x79, 0x44, 0x65, 0x6c, 0x61, 0x79,
+	0x4d, 0x73, 0x12, 0x2c, 0x0a, 0x12, 0x6d, 0x61, 0x78, 0x5f, 0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72,
+	0x72, 0x65, 0x6e, 0x74, 0x5f, 0x74, 0x72, 0x79, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x10,
+	0x6d, 0x61, 0x78, 0x43, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x54, 0x72, 0x79,
+	0x2a, 0xa9, 0x01, 0x0a, 0x0e, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x74, 0x72, 0x61, 0x74,
+	0x65, 0x67, 0x79, 0x12, 0x09, 0x0a, 0x05, 0x41, 0x53, 0x5f, 0x49, 0x53, 0x10, 0x00, 0x12, 0x0a,
+	0x0a, 0x06, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x10, 0x01, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x53,
+	0x45, 0x5f, 0x49, 0x50, 0x34, 0x10, 0x02, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x53, 0x45, 0x5f, 0x49,
+	0x50, 0x36, 0x10, 0x03, 0x12, 0x0c, 0x0a, 0x08, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x34, 0x36,
+	0x10, 0x04, 0x12, 0x0c, 0x0a, 0x08, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x36, 0x34, 0x10, 0x05,
+	0x12, 0x0c, 0x0a, 0x08, 0x46, 0x4f, 0x52, 0x43, 0x45, 0x5f, 0x49, 0x50, 0x10, 0x06, 0x12, 0x0d,
+	0x0a, 0x09, 0x46, 0x4f, 0x52, 0x43, 0x45, 0x5f, 0x49, 0x50, 0x34, 0x10, 0x07, 0x12, 0x0d, 0x0a,
+	0x09, 0x46, 0x4f, 0x52, 0x43, 0x45, 0x5f, 0x49, 0x50, 0x36, 0x10, 0x08, 0x12, 0x0e, 0x0a, 0x0a,
+	0x46, 0x4f, 0x52, 0x43, 0x45, 0x5f, 0x49, 0x50, 0x34, 0x36, 0x10, 0x09, 0x12, 0x0e, 0x0a, 0x0a,
+	0x46, 0x4f, 0x52, 0x43, 0x45, 0x5f, 0x49, 0x50, 0x36, 0x34, 0x10, 0x0a, 0x2a, 0x97, 0x01, 0x0a,
+	0x13, 0x41, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x50, 0x6f, 0x72, 0x74, 0x53, 0x74, 0x72, 0x61,
+	0x74, 0x65, 0x67, 0x79, 0x12, 0x08, 0x0a, 0x04, 0x4e, 0x6f, 0x6e, 0x65, 0x10, 0x00, 0x12, 0x0f,
+	0x0a, 0x0b, 0x53, 0x72, 0x76, 0x50, 0x6f, 0x72, 0x74, 0x4f, 0x6e, 0x6c, 0x79, 0x10, 0x01, 0x12,
+	0x12, 0x0a, 0x0e, 0x53, 0x72, 0x76, 0x41, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x4f, 0x6e, 0x6c,
+	0x79, 0x10, 0x02, 0x12, 0x15, 0x0a, 0x11, 0x53, 0x72, 0x76, 0x50, 0x6f, 0x72, 0x74, 0x41, 0x6e,
+	0x64, 0x41, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x10, 0x03, 0x12, 0x0f, 0x0a, 0x0b, 0x54, 0x78,
+	0x74, 0x50, 0x6f, 0x72, 0x74, 0x4f, 0x6e, 0x6c, 0x79, 0x10, 0x04, 0x12, 0x12, 0x0a, 0x0e, 0x54,
+	0x78, 0x74, 0x41, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x4f, 0x6e, 0x6c, 0x79, 0x10, 0x05, 0x12,
+	0x15, 0x0a, 0x11, 0x54, 0x78, 0x74, 0x50, 0x6f, 0x72, 0x74, 0x41, 0x6e, 0x64, 0x41, 0x64, 0x64,
+	0x72, 0x65, 0x73, 0x73, 0x10, 0x06, 0x42, 0x67, 0x0a, 0x1b, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72,
+	0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74,
+	0x65, 0x72, 0x6e, 0x65, 0x74, 0x50, 0x01, 0x5a, 0x2c, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
+	0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f,
+	0x72, 0x65, 0x2f, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74,
+	0x65, 0x72, 0x6e, 0x65, 0x74, 0xaa, 0x02, 0x17, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x54, 0x72, 0x61,
+	0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x62,
+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

transport/internet/config.proto

@@ -132,6 +132,8 @@ message SocketConfig {
   AddressPortStrategy address_port_strategy = 21;
 
   HappyEyeballsConfig happy_eyeballs = 22;
+
+  repeated string trusted_x_forwarded_for = 23;
 }
 
 message HappyEyeballsConfig {

transport/internet/dialer.go

@@ -3,7 +3,6 @@ package internet
 import (
 	"context"
 	"fmt"
-	gonet "net"
 	"strings"
 
 	"github.com/xtls/xray-core/common"
@@ -183,7 +182,7 @@ func checkAddressPortStrategy(ctx context.Context, dest net.Destination, sockopt
 		if len(parts) != 3 {
 			return nil, errors.New("invalid address format", dest.Address.String())
 		}
-		_, srvRecords, err := gonet.DefaultResolver.LookupSRV(context.Background(), parts[0][1:], parts[1][1:], parts[2])
+		_, srvRecords, err := net.DefaultResolver.LookupSRV(context.Background(), parts[0][1:], parts[1][1:], parts[2])
 		if err != nil {
 			return nil, errors.New("failed to lookup SRV record").Base(err)
 		}
@@ -198,7 +197,7 @@ func checkAddressPortStrategy(ctx context.Context, dest net.Destination, sockopt
 	}
 	if OverrideBy == "txt" {
 		errors.LogDebug(ctx, "query TXT record for "+dest.Address.String())
-		txtRecords, err := gonet.DefaultResolver.LookupTXT(ctx, dest.Address.String())
+		txtRecords, err := net.DefaultResolver.LookupTXT(ctx, dest.Address.String())
 		if err != nil {
 			errors.LogError(ctx, "failed to lookup SRV record: "+err.Error())
 			return nil, errors.New("failed to lookup SRV record").Base(err)

transport/internet/grpc/dial.go

@@ -2,7 +2,6 @@ package grpc
 
 import (
 	"context"
-	gonet "net"
 	"sync"
 	"time"
 
@@ -99,7 +98,7 @@ func getGrpcClient(ctx context.Context, dest net.Destination, streamSettings *in
 			},
 			MinConnectTimeout: 5 * time.Second,
 		}),
-		grpc.WithContextDialer(func(gctx context.Context, s string) (gonet.Conn, error) {
+		grpc.WithContextDialer(func(gctx context.Context, s string) (net.Conn, error) {
 			select {
 			case <-gctx.Done():
 				return nil, gctx.Err()
@@ -180,7 +179,7 @@ func getGrpcClient(ctx context.Context, dest net.Destination, streamSettings *in
 	}
 
 	conn, err := grpc.Dial(
-		gonet.JoinHostPort(grpcDestHost, dest.Port.String()),
+		net.JoinHostPort(grpcDestHost, dest.Port.String()),
 		dialOptions...,
 	)
 	globalDialerMap[dialerConf{dest, streamSettings}] = conn

transport/internet/grpc/encoding/hunkconn.go

@@ -3,11 +3,10 @@ package encoding
 import (
 	"context"
 	"io"
-	"net"
 
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
-	xnet "github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/signal/done"
 	"google.golang.org/grpc/metadata"
@@ -55,7 +54,7 @@ func NewHunkConn(hc HunkConn, cancel context.CancelFunc) net.Conn {
 	if ok {
 		header := md.Get("x-real-ip")
 		if len(header) > 0 {
-			realip := xnet.ParseAddress(header[0])
+			realip := net.ParseAddress(header[0])
 			if realip.Family().IsIP() {
 				rAddr = &net.TCPAddr{
 					IP:   realip.IP(),

transport/internet/httpupgrade/hub.go

@@ -20,6 +20,7 @@ type server struct {
 	config         *Config
 	addConn        internet.ConnHandler
 	innnerListener net.Listener
+	socketSettings *internet.SocketConfig
 }
 
 func (s *server) Close() error {
@@ -70,7 +71,17 @@ func (s *server) Handle(conn net.Conn) (stat.Connection, error) {
 		return nil, err
 	}
 
-	forwardedAddrs := http_proto.ParseXForwardedFor(req.Header)
+	var forwardedAddrs []net.Address
+	if s.socketSettings != nil && len(s.socketSettings.TrustedXForwardedFor) > 0 {
+		for _, key := range s.socketSettings.TrustedXForwardedFor {
+			if len(req.Header.Values(key)) > 0 {
+				forwardedAddrs = http_proto.ParseXForwardedFor(req.Header)
+				break
+			}
+		}
+	} else {
+		forwardedAddrs = http_proto.ParseXForwardedFor(req.Header)
+	}
 	remoteAddr := conn.RemoteAddr()
 	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
 		remoteAddr = &net.TCPAddr{
@@ -141,6 +152,7 @@ func ListenHTTPUpgrade(ctx context.Context, address net.Address, port net.Port,
 		config:         transportConfiguration,
 		addConn:        addConn,
 		innnerListener: listener,
+		socketSettings: streamSettings.SocketSettings,
 	}
 	go serverInstance.keepAccepting()
 	return serverInstance, nil

transport/internet/sockopt_darwin.go

@@ -2,7 +2,6 @@ package internet
 
 import (
 	"context"
-	gonet "net"
 	"os"
 	"runtime"
 	"strconv"
@@ -135,7 +134,7 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 	}
 
 	if config.Interface != "" {
-		iface, err := gonet.InterfaceByName(config.Interface)
+		iface, err := net.InterfaceByName(config.Interface)
 
 		if err != nil {
 			return errors.New("failed to get interface ", config.Interface).Base(err)
@@ -226,7 +225,7 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 	}
 
 	if config.Interface != "" {
-		iface, err := gonet.InterfaceByName(config.Interface)
+		iface, err := net.InterfaceByName(config.Interface)
 
 		if err != nil {
 			return errors.New("failed to get interface ", config.Interface).Base(err)

transport/internet/splithttp/browser_client.go

@@ -3,9 +3,9 @@ package splithttp
 import (
 	"context"
 	"io"
-	gonet "net"
 
 	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/transport/internet/browser_dialer"
 	"github.com/xtls/xray-core/transport/internet/websocket"
 )
@@ -19,13 +19,13 @@ func (c *BrowserDialerClient) IsClosed() bool {
 	panic("not implemented yet")
 }
 
-func (c *BrowserDialerClient) OpenStream(ctx context.Context, url string, body io.Reader, uploadOnly bool) (io.ReadCloser, gonet.Addr, gonet.Addr, error) {
+func (c *BrowserDialerClient) OpenStream(ctx context.Context, url string, body io.Reader, uploadOnly bool) (io.ReadCloser, net.Addr, net.Addr, error) {
 	if body != nil {
 		return nil, nil, nil, errors.New("bidirectional streaming for browser dialer not implemented yet")
 	}
 
 	conn, err := browser_dialer.DialGet(url, c.transportConfig.GetRequestHeader(url))
-	dummyAddr := &gonet.IPAddr{}
+	dummyAddr := &net.IPAddr{}
 	if err != nil {
 		return nil, dummyAddr, dummyAddr, err
 	}

transport/internet/splithttp/client.go

@@ -5,7 +5,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	gonet "net"
 	"net/http"
 	"net/http/httptrace"
 	"sync"
@@ -42,7 +41,7 @@ func (c *DefaultDialerClient) IsClosed() bool {
 	return c.closed
 }
 
-func (c *DefaultDialerClient) OpenStream(ctx context.Context, url string, body io.Reader, uploadOnly bool) (wrc io.ReadCloser, remoteAddr, localAddr gonet.Addr, err error) {
+func (c *DefaultDialerClient) OpenStream(ctx context.Context, url string, body io.Reader, uploadOnly bool) (wrc io.ReadCloser, remoteAddr, localAddr net.Addr, err error) {
 	// this is done when the TCP/UDP connection to the server was established,
 	// and we can unblock the Dial function and print correct net addresses in
 	// logs

transport/internet/splithttp/hub.go

@@ -27,13 +27,14 @@ import (
 )
 
 type requestHandler struct {
-	config    *Config
-	host      string
-	path      string
-	ln        *Listener
-	sessionMu *sync.Mutex
-	sessions  sync.Map
-	localAddr net.Addr
+	config         *Config
+	host           string
+	path           string
+	ln             *Listener
+	sessionMu      *sync.Mutex
+	sessions       sync.Map
+	localAddr      net.Addr
+	socketSettings *internet.SocketConfig
 }
 
 type httpSession struct {
@@ -139,7 +140,17 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		return
 	}
 
-	forwardedAddrs := http_proto.ParseXForwardedFor(request.Header)
+	var forwardedAddrs []net.Address
+	if h.socketSettings != nil && len(h.socketSettings.TrustedXForwardedFor) > 0 {
+		for _, key := range h.socketSettings.TrustedXForwardedFor {
+			if len(request.Header.Values(key)) > 0 {
+				forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
+				break
+			}
+		}
+	} else {
+		forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
+	}
 	var remoteAddr net.Addr
 	var err error
 	remoteAddr, err = net.ResolveTCPAddr("tcp", request.RemoteAddr)
@@ -356,12 +367,13 @@ func ListenXH(ctx context.Context, address net.Address, port net.Port, streamSet
 		}
 	}
 	handler := &requestHandler{
-		config:    l.config,
-		host:      l.config.Host,
-		path:      l.config.GetNormalizedPath(),
-		ln:        l,
-		sessionMu: &sync.Mutex{},
-		sessions:  sync.Map{},
+		config:         l.config,
+		host:           l.config.Host,
+		path:           l.config.GetNormalizedPath(),
+		ln:             l,
+		sessionMu:      &sync.Mutex{},
+		sessions:       sync.Map{},
+		socketSettings: streamSettings.SocketSettings,
 	}
 	tlsConfig := getTLSConfig(streamSettings)
 	l.isH3 = len(tlsConfig.NextProtos) == 1 && tlsConfig.NextProtos[0] == "h3"

transport/internet/system_dialer.go

@@ -3,7 +3,6 @@ package internet
 import (
 	"context"
 	"math/rand"
-	gonet "net"
 	"syscall"
 	"time"
 
@@ -89,7 +88,7 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 		}, nil
 	}
 	// Chrome defaults
-	keepAliveConfig := gonet.KeepAliveConfig{
+	keepAliveConfig := net.KeepAliveConfig{
 		Enable:   true,
 		Idle:     45 * time.Second,
 		Interval: 45 * time.Second,

transport/internet/system_listener.go

@@ -2,7 +2,6 @@ package internet
 
 import (
 	"context"
-	gonet "net"
 	"os"
 	"runtime"
 	"strconv"
@@ -95,7 +94,7 @@ func (dl *DefaultListener) Listen(ctx context.Context, addr net.Addr, sockopt *S
 			if sockopt.TcpKeepAliveIdle*sockopt.TcpKeepAliveInterval < 0 {
 				return nil, errors.New("invalid TcpKeepAliveIdle or TcpKeepAliveInterval value: ", sockopt.TcpKeepAliveIdle, " ", sockopt.TcpKeepAliveInterval)
 			}
-			lc.KeepAliveConfig = gonet.KeepAliveConfig{
+			lc.KeepAliveConfig = net.KeepAliveConfig{
 				Enable:   false,
 				Idle:     -1,
 				Interval: -1,

transport/internet/websocket/dialer.go

@@ -5,7 +5,6 @@ import (
 	_ "embed"
 	"encoding/base64"
 	"io"
-	gonet "net"
 	"time"
 
 	"github.com/gorilla/websocket"
@@ -64,7 +63,7 @@ func dialWebSocket(ctx context.Context, dest net.Destination, streamSettings *in
 		tlsConfig := tConfig.GetTLSConfig(tls.WithDestination(dest), tls.WithNextProto("http/1.1"))
 		dialer.TLSClientConfig = tlsConfig
 		if fingerprint := tls.GetFingerprint(tConfig.Fingerprint); fingerprint != nil {
-			dialer.NetDialTLSContext = func(_ context.Context, _, addr string) (gonet.Conn, error) {
+			dialer.NetDialTLSContext = func(_ context.Context, _, addr string) (net.Conn, error) {
 				// Like the NetDial in the dialer
 				pconn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
 				if err != nil {

transport/internet/websocket/hub.go

@@ -21,9 +21,10 @@ import (
 )
 
 type requestHandler struct {
-	host string
-	path string
-	ln   *Listener
+	host           string
+	path           string
+	ln             *Listener
+	socketSettings *internet.SocketConfig
 }
 
 var replacer = strings.NewReplacer("+", "-", "/", "_", "=", "")
@@ -64,7 +65,17 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		return
 	}
 
-	forwardedAddrs := http_proto.ParseXForwardedFor(request.Header)
+	var forwardedAddrs []net.Address
+	if h.socketSettings != nil && len(h.socketSettings.TrustedXForwardedFor) > 0 {
+		for _, key := range h.socketSettings.TrustedXForwardedFor {
+			if len(request.Header.Values(key)) > 0 {
+				forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
+				break
+			}
+		}
+	} else {
+		forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
+	}
 	remoteAddr := conn.RemoteAddr()
 	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
 		remoteAddr = &net.TCPAddr{
@@ -132,9 +143,10 @@ func ListenWS(ctx context.Context, address net.Address, port net.Port, streamSet
 
 	l.server = http.Server{
 		Handler: &requestHandler{
-			host: wsSettings.Host,
-			path: wsSettings.GetNormalizedPath(),
-			ln:   l,
+			host:           wsSettings.Host,
+			path:           wsSettings.GetNormalizedPath(),
+			ln:             l,
+			socketSettings: streamSettings.SocketSettings,
 		},
 		ReadHeaderTimeout: time.Second * 4,
 		MaxHeaderBytes:    8192,

transport/pipe/impl.go

@@ -3,7 +3,6 @@ package pipe
 import (
 	"errors"
 	"io"
-	"runtime"
 	"sync"
 	"time"
 
@@ -136,11 +135,10 @@ func (p *pipe) writeMultiBufferInternal(mb buf.MultiBuffer) error {
 
 	if p.data == nil {
 		p.data = mb
-		return nil
+	} else {
+		p.data, _ = buf.MergeMulti(p.data, mb)
 	}
-
-	p.data, _ = buf.MergeMulti(p.data, mb)
-	return errSlowDown
+	return nil
 }
 
 func (p *pipe) WriteMultiBuffer(mb buf.MultiBuffer) error {
@@ -155,30 +153,23 @@ func (p *pipe) WriteMultiBuffer(mb buf.MultiBuffer) error {
 			return nil
 		}
 
-		if err == errSlowDown {
-			p.readSignal.Signal()
-
-			// Yield current goroutine. Hopefully the reading counterpart can pick up the payload.
-			runtime.Gosched()
-			return nil
+		if err == errBufferFull {
+			if p.option.discardOverflow {
+				buf.ReleaseMulti(mb)
+				return nil
+			}
+			select {
+			case <-p.writeSignal.Wait():
+				continue
+			case <-p.done.Wait():
+				buf.ReleaseMulti(mb)
+				return io.ErrClosedPipe
+			}
 		}
 
-		if err == errBufferFull && p.option.discardOverflow {
-			buf.ReleaseMulti(mb)
-			return nil
-		}
-
-		if err != errBufferFull {
-			buf.ReleaseMulti(mb)
-			p.readSignal.Signal()
-			return err
-		}
-
-		select {
-		case <-p.writeSignal.Wait():
-		case <-p.done.Wait():
-			return io.ErrClosedPipe
-		}
+		buf.ReleaseMulti(mb)
+		p.readSignal.Signal()
+		return err
 	}
 }