Add new admin panel, failover, dns fallback, providers, limiters. Update XHTTP

Signed-off-by: Shtorm <108103062+shtorm-7@users.noreply.github.com>

.gitignore

@@ -21,3 +21,5 @@
 CLAUDE.md
 AGENTS.md
 /.claude/
+dist
+logs

.gitmodules

@@ -1,6 +0,0 @@
-[submodule "clients/apple"]
-	path = clients/apple
-	url = https://github.com/SagerNet/sing-box-for-apple.git
-[submodule "clients/android"]
-	path = clients/android
-	url = https://github.com/SagerNet/sing-box-for-android.git

.goreleaser.yaml

@@ -0,0 +1,138 @@
+version: 2
+project_name: sing-box
+builds:
+  - &template
+    id: main
+    main: ./cmd/sing-box
+    flags:
+      - -v
+      - -trimpath
+    ldflags:
+      - -X github.com/sagernet/sing-box/constant.Version={{ .Version }}
+      - -s
+      - -buildid=
+    tags:
+      - with_gvisor
+      - with_quic
+      - with_dhcp
+      - with_wireguard
+      - with_utls
+      - with_acme
+      - with_clash_api
+      - with_tailscale
+      - with_masque
+      - with_mtproxy
+      - with_manager
+      - with_admin_panel
+    env:
+      - CGO_ENABLED=0
+      - GOTOOLCHAIN=local
+    targets:
+      - linux_386
+      - linux_amd64_v1
+      - linux_arm64
+      - linux_arm_6
+      - linux_arm_7
+      - linux_s390x
+      - linux_riscv64
+      - windows_amd64_v1
+      - windows_386
+      - windows_arm64
+      - darwin_amd64_v1
+      - darwin_arm64
+    mod_timestamp: '{{ .CommitTimestamp }}'
+  - id: mips
+    <<: *template
+    tags:
+      - with_gvisor
+      - with_quic
+      - with_dhcp
+      - with_wireguard
+      - with_utls
+      - with_acme
+      - with_clash_api
+      - with_tailscale
+      - with_masque
+      - with_mtproxy
+    targets:
+      - linux_mips
+      - linux_mips_softfloat
+      - linux_mipsle
+      - linux_mipsle_softfloat
+      - linux_mips64
+      - linux_mips64le
+  - id: android
+    <<: *template
+    env:
+      - CGO_ENABLED=1
+      - GOTOOLCHAIN=local
+    overrides:
+      - goos: android
+        goarch: arm
+        goarm: 7
+        env:
+          - CC=armv7a-linux-androideabi21-clang
+          - CXX=armv7a-linux-androideabi21-clang++
+      - goos: android
+        goarch: arm64
+        env:
+          - CC=aarch64-linux-android21-clang
+          - CXX=aarch64-linux-android21-clang++
+      - goos: android
+        goarch: 386
+        env:
+          - CC=i686-linux-android21-clang
+          - CXX=i686-linux-android21-clang++
+      - goos: android
+        goarch: amd64
+        goamd64: v1
+        env:
+          - CC=x86_64-linux-android21-clang
+          - CXX=x86_64-linux-android21-clang++
+    targets:
+      - android_arm_7
+      - android_arm64
+      - android_386
+      - android_amd64
+archives:
+  - &template
+    id: archive
+    builds:
+      - main
+      - mips
+      - android
+    formats:
+      - tar.gz
+    format_overrides:
+      - goos: windows
+        formats:
+          - zip
+    wrap_in_directory: true
+    files:
+      - LICENSE
+    name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ with .Arm }}v{{ . }}{{ end }}{{ if and .Mips (not (eq .Mips "hardfloat")) }}-{{ .Mips }}{{ end }}{{ if not (eq .Amd64 "v1") }}{{ .Amd64 }}{{ end }}'
+  - id: archive-legacy
+    <<: *template
+    builds:
+      - legacy
+    name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}-legacy'
+source:
+  enabled: false
+  name_template: '{{ .ProjectName }}-{{ .Version }}.source'
+  prefix_template: '{{ .ProjectName }}-{{ .Version }}/'
+checksum:
+  disable: true
+  name_template: '{{ .ProjectName }}-{{ .Version }}.checksum'
+signs:
+  - artifacts: checksum
+release:
+  github:
+    owner: shtorm-7
+    name: sing-box-extended
+  draft: true
+  prerelease: auto
+  mode: replace
+  ids:
+    - archive
+    - package
+  skip_upload: true

DONATE.md

@@ -0,0 +1,24 @@
+# Support the project
+
+If you want to support the project, you can donate to the following addresses.
+
+### TRX (Tron)
+```
+TSWU6VUZ4FcUghYDmbbhK15gRVvhvBgW3F
+```
+### TON
+```
+UQAyD2UuT5kCP6lZQlhFL0hyNibDXNE4nIo_RSLVSYAtD7N1
+```
+### Solana
+```
+CJu8ickwRCwNE71uVFjYf1UveyCkRp9Xo44rhPcQpeFL
+```
+### Bitcoin
+```
+bc1qqx97p8k4dchqkyd47s4vf74hrqdfnmhqvcja7x
+```
+### Ethereum
+```
+0xAcc5919C22F2B3fAa0ec7E8BaD142da5B375FBF6
+```

Dockerfile

@@ -1,5 +1,5 @@
-FROM --platform=$BUILDPLATFORM golang:1.25-alpine AS builder
-LABEL maintainer="nekohasekai <contact-git@sekai.icu>"
+FROM --platform=$BUILDPLATFORM golang:1.26-alpine AS builder
+LABEL maintainer="shtorm-7"
 COPY . /go/src/github.com/sagernet/sing-box
 WORKDIR /go/src/github.com/sagernet/sing-box
 ARG TARGETOS TARGETARCH
@@ -19,7 +19,7 @@ RUN set -ex \
         -ldflags "-X \"github.com/sagernet/sing-box/constant.Version=$VERSION\" $LDFLAGS_SHARED -s -w -buildid=" \
         ./cmd/sing-box
 FROM --platform=$TARGETPLATFORM alpine AS dist
-LABEL maintainer="nekohasekai <contact-git@sekai.icu>"
+LABEL maintainer="shtorm-7"
 RUN set -ex \
     && apk add --no-cache --upgrade bash tzdata ca-certificates nftables
 COPY --from=builder /go/bin/sing-box /usr/local/bin/sing-box

Makefile

@@ -14,12 +14,35 @@ PREFIX ?= $(shell go env GOPATH)
 SING_FFI ?= sing-ffi
 LIBBOX_FFI_CONFIG ?= ./experimental/libbox/ffi.json
 
+ADMIN_PANEL_DIR = service/admin_panel
+ADMIN_PANEL_WEB = $(ADMIN_PANEL_DIR)/web
+ADMIN_PANEL_DIST = $(ADMIN_PANEL_DIR)/dist
+ADMIN_PANEL_TAGS = $(TAGS),with_admin_panel
+
+DOCKER_IMAGE ?= shtorm7/sing-box-extended
+DOCKER_PLATFORMS ?= linux/amd64,linux/arm64
+
 .PHONY: test release docs build
 
 build:
 	export GOTOOLCHAIN=local && \
 	go build $(MAIN_PARAMS) $(MAIN)
 
+admin_panel_web:
+	cd $(ADMIN_PANEL_WEB) && \
+		npm install --no-fund --no-audit && \
+		npm run build
+
+admin_panel_pack:
+	go run ./cmd/internal/admin_panel_pack \
+		-dir $(ADMIN_PANEL_DIST)
+
+admin_panel_regen: admin_panel_web admin_panel_pack
+
+build_admin_panel:
+	export GOTOOLCHAIN=local && \
+	go build $(PARAMS) -tags "$(ADMIN_PANEL_TAGS)" $(MAIN)
+
 race:
 	export GOTOOLCHAIN=local && \
 	go build -race $(MAIN_PARAMS) $(MAIN)
@@ -70,14 +93,10 @@ update_certificates:
 	go run ./cmd/internal/update_certificates
 
 release:
-	go run ./cmd/internal/build goreleaser release --clean --skip publish
+	go run ./cmd/internal/build goreleaser release --skip=validate --clean -p 3 --skip publish
 	mkdir dist/release
 	mv dist/*.tar.gz \
 		dist/*.zip \
-		dist/*.deb \
-		dist/*.rpm \
-		dist/*_amd64.pkg.tar.zst \
-		dist/*_arm64.pkg.tar.zst \
 		dist/release
 	ghr --replace --draft --prerelease -p 5 "v${VERSION}" dist/release
 	rm -r dist/release
@@ -88,11 +107,20 @@ release_repo:
 release_install:
 	go install -v github.com/tcnksm/ghr@latest
 
+release_docker:
+	sudo docker buildx build \
+		--platform $(DOCKER_PLATFORMS) \
+		-t $(DOCKER_IMAGE):latest \
+		-t $(DOCKER_IMAGE):$(VERSION) \
+		--push \
+		--network=host \
+		.
+
 update_android_version:
 	go run ./cmd/internal/update_android_version
 
 build_android:
-	cd ../sing-box-for-android && ./gradlew :app:clean :app:assembleOtherRelease :app:assembleOtherLegacyRelease && ./gradlew --stop
+	cd ../sing-box-for-android && ./gradlew :app:clean :app:assembleOtherRelease && ./gradlew --stop
 
 upload_android:
 	mkdir -p dist/release_android
@@ -101,7 +129,7 @@ upload_android:
 	ghr --replace --draft --prerelease -p 5 "v${VERSION}" dist/release_android
 	rm -rf dist/release_android
 
-release_android: lib_android update_android_version build_android upload_android
+release_android: lib_android update_android_version build_android
 
 publish_android:
 	cd ../sing-box-for-android && ./gradlew :app:publishPlayReleaseBundle && ./gradlew --stop

README.md

@@ -1,12 +1,87 @@
-# sing-box
+# sing-box-extended
 
-The universal proxy platform.
+Sing-box with extended features.
 
-[![Packaging status](https://repology.org/badge/vertical-allrepos/sing-box.svg)](https://repology.org/project/sing-box/versions)
+## 🔥 Features
 
-## Documentation
+### Outbounds
+- **WARP** — Cloudflare WARP integration through WireGuard
+- **MASQUE** — Cloudflare MASQUE proxy over QUIC / HTTP-2
+- **MTProxy** — Telegram MTProxy server with FakeTLS and domain fronting
+- **Mieru** — Secure, hard to classify, hard to probe network protocol
+- **VPN** — Routed tunnel over any TCP sing-box protocol
+- **Bond** — Link aggregation for increasing throughput
+- **Fallback** — Outbound group with priority-based switching
+- **Failover** — Automatic outbound switching with session recovery for high availability
 
-https://sing-box.sagernet.org
+### DNS
+- **SDNS (DNSCrypt)** — Encrypted DNS queries for enhanced privacy
+- **DNS Fallback** — Sequential / parallel queries across upstream resolvers
+
+### Limiters
+- **Bandwidth Limiter** — Upload / download / bidirectional rate limiting
+- **Connection Limiter** — Concurrent connection control
+- **Traffic Limiter** — Per-user traffic quotas
+- **Rate Limiter** — Request rate limiting
+
+### Encryption & Obfuscation
+- **Amnezia 2.0** — WireGuard traffic obfuscation
+- **VLESS encryption** — XRAY encryption for VLESS protocol
+
+### Transports
+- **mKCP** — Reliable UDP-based transport
+- **XHTTP** — Modern XRAY transport
+
+### Services
+- **Admin Panel** — Web-based management interface
+- **Manager** — Management service for configuring users, nodes, limiters
+- **Manager API (HTTP/gRPC)** — HTTP and gRPC API for the Manager
+- **Node Manager API** — Service for connecting nodes to remote manager
+
+### Miscellaneous
+- **Providers** — Outbound subscriptions from local files, inline lists, or remote URLs (sing-box JSON, Clash YAML, SIP008, share links)
+- **Link Parser** — Outbound configured from a share link (VLESS, VMess, Shadowsocks, Trojan, Hysteria, Hysteria2, TUIC)
+- **Extended WireGuard options** — Advanced configuration capabilities
+- **Unified Delay** — Unified latency measurement
+
+## 📚 Examples
+
+Configuration examples are available here:
+
+https://github.com/shtorm-7/sing-box-extended/tree/extended/examples
+
+## Support the Project
+
+If you want to support the project, you can donate to the following addresses.
+
+#### Tribute
+
+**[RUB Donate](https://web.tribute.tg/d/JxY)**
+
+**[EUR Donate](https://web.tribute.tg/d/JxZ)**
+
+**[USD Donate](https://web.tribute.tg/d/Jy1)**
+
+#### TRX (Tron)
+```
+TSWU6VUZ4FcUghYDmbbhK15gRVvhvBgW3F
+```
+#### TON
+```
+UQAyD2UuT5kCP6lZQlhFL0hyNibDXNE4nIo_RSLVSYAtD7N1
+```
+#### Solana
+```
+CJu8ickwRCwNE71uVFjYf1UveyCkRp9Xo44rhPcQpeFL
+```
+#### Bitcoin
+```
+bc1qqx97p8k4dchqkyd47s4vf74hrqdfnmhqvcja7x
+```
+#### Ethereum
+```
+0xAcc5919C22F2B3fAa0ec7E8BaD142da5B375FBF6
+```
 
 ## License
 
@@ -28,4 +103,4 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 In addition, no derivative work may use the name or imply association
 with this application without prior consent.
-```
+```

adapter/endpoint/manager.go

@@ -35,7 +35,6 @@ func NewManager(logger log.ContextLogger, registry adapter.EndpointRegistry) *Ma
 
 func (m *Manager) Start(stage adapter.StartStage) error {
 	m.access.Lock()
-	defer m.access.Unlock()
 	if m.started && m.stage >= stage {
 		panic("already started")
 	}
@@ -43,9 +42,12 @@ func (m *Manager) Start(stage adapter.StartStage) error {
 	m.stage = stage
 	if stage == adapter.StartStateStart {
 		// started with outbound manager
+		m.access.Unlock()
 		return nil
 	}
-	for _, endpoint := range m.endpoints {
+	endpoints := m.endpoints
+	m.access.Unlock()
+	for _, endpoint := range endpoints {
 		name := "endpoint/" + endpoint.Type() + "[" + endpoint.Tag() + "]"
 		done := adapter.LogElapsed(m.logger, stage, " ", name)
 		err := adapter.LegacyStart(endpoint, stage)

adapter/experimental.go

@@ -47,6 +47,9 @@ type CacheFile interface {
 	StoreRDRC() bool
 	RDRCStore
 
+	StoreWARPConfig() bool
+	StoreMASQUEConfig() bool
+
 	LoadMode() string
 	StoreMode(mode string) error
 	LoadSelected(group string) string
@@ -55,6 +58,12 @@ type CacheFile interface {
 	StoreGroupExpand(group string, expand bool) error
 	LoadRuleSet(tag string) *SavedBinary
 	SaveRuleSet(tag string, set *SavedBinary) error
+	LoadWARPConfig(tag string) *SavedBinary
+	SaveWARPConfig(tag string, set *SavedBinary) error
+	LoadMASQUEConfig(tag string) *SavedBinary
+	SaveMASQUEConfig(tag string, set *SavedBinary) error
+	LoadSubscription(tag string) *SavedBinary
+	SaveSubscription(tag string, sub *SavedBinary) error
 }
 
 type SavedBinary struct {

adapter/inbound.go

@@ -30,6 +30,7 @@ type UDPInjectableInbound interface {
 type InboundRegistry interface {
 	option.InboundOptionsRegistry
 	Create(ctx context.Context, router Router, logger log.ContextLogger, tag string, inboundType string, options any) (Inbound, error)
+	UnsafeCreate(ctx context.Context, router Router, logger log.ContextLogger, tag string, inboundType string, options any) (Inbound, error)
 }
 
 type InboundManager interface {
@@ -47,6 +48,7 @@ type InboundContext struct {
 	Network     string
 	Source      M.Socksaddr
 	Destination M.Socksaddr
+	Gateway     *netip.Addr
 	User        string
 	Outbound    string
 

adapter/inbound/registry.go

@@ -57,6 +57,10 @@ func (m *Registry) CreateOptions(outboundType string) (any, bool) {
 func (m *Registry) Create(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, outboundType string, options any) (adapter.Inbound, error) {
 	m.access.Lock()
 	defer m.access.Unlock()
+	return m.UnsafeCreate(ctx, router, logger, tag, outboundType, options)
+}
+
+func (m *Registry) UnsafeCreate(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, outboundType string, options any) (adapter.Inbound, error) {
 	constructor, loaded := m.constructor[outboundType]
 	if !loaded {
 		return nil, E.New("outbound type not found: " + outboundType)

adapter/outbound.go

@@ -35,6 +35,7 @@ type DirectRouteOutbound interface {
 type OutboundRegistry interface {
 	option.OutboundOptionsRegistry
 	CreateOutbound(ctx context.Context, router Router, logger log.ContextLogger, tag string, outboundType string, options any) (Outbound, error)
+	UnsafeCreateOutbound(ctx context.Context, router Router, logger log.ContextLogger, tag string, outboundType string, options any) (Outbound, error)
 }
 
 type OutboundManager interface {

adapter/outbound/registry.go

@@ -57,6 +57,10 @@ func (r *Registry) CreateOptions(outboundType string) (any, bool) {
 func (r *Registry) CreateOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, outboundType string, options any) (adapter.Outbound, error) {
 	r.access.Lock()
 	defer r.access.Unlock()
+	return r.UnsafeCreateOutbound(ctx, router, logger, tag, outboundType, options)
+}
+
+func (r *Registry) UnsafeCreateOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, outboundType string, options any) (adapter.Outbound, error) {
 	constructor, loaded := r.constructors[outboundType]
 	if !loaded {
 		return nil, E.New("outbound type not found: " + outboundType)

adapter/provider.go

@@ -0,0 +1,51 @@
+package adapter
+
+import (
+	"context"
+	"time"
+
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common/x/list"
+)
+
+type Provider interface {
+	Type() string
+	Tag() string
+	Outbounds() []Outbound
+	Outbound(tag string) (Outbound, bool)
+	UpdatedAt() time.Time
+	HealthCheck(ctx context.Context) (map[string]uint16, error)
+	RegisterCallback(callback ProviderUpdateCallback) *list.Element[ProviderUpdateCallback]
+	UnregisterCallback(element *list.Element[ProviderUpdateCallback])
+}
+
+type ProviderUpdater interface {
+	Update() error
+}
+
+type ProviderSubscriptionInfo interface {
+	SubscriptionInfo() SubscriptionInfo
+}
+
+type ProviderRegistry interface {
+	option.ProviderOptionsRegistry
+	CreateProvider(ctx context.Context, router Router, logFactory log.Factory, tag string, providerType string, options any) (Provider, error)
+}
+
+type ProviderManager interface {
+	Lifecycle
+	Providers() []Provider
+	Get(tag string) (Provider, bool)
+	Remove(tag string) error
+	Create(ctx context.Context, router Router, logFactory log.Factory, tag string, providerType string, options any) error
+}
+
+type SubscriptionInfo struct {
+	Upload   int64
+	Download int64
+	Total    int64
+	Expire   int64
+}
+
+type ProviderUpdateCallback = func(tag string) error

adapter/provider/adapter.go

@@ -0,0 +1,267 @@
+package provider
+
+import (
+	"context"
+	"reflect"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/urltest"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common/batch"
+	E "github.com/sagernet/sing/common/exceptions"
+	F "github.com/sagernet/sing/common/format"
+	"github.com/sagernet/sing/common/x/list"
+	"github.com/sagernet/sing/service"
+)
+
+type Adapter struct {
+	ctx            context.Context
+	outbound       adapter.OutboundManager
+	router         adapter.Router
+	logFactory     log.Factory
+	logger         log.ContextLogger
+	providerType   string
+	providerTag    string
+	outbounds      []adapter.Outbound
+	outboundsByTag map[string]adapter.Outbound
+	ticker         *time.Ticker
+	checking       atomic.Bool
+	history        adapter.URLTestHistoryStorage
+	callbackAccess sync.Mutex
+	callbacks      list.List[adapter.ProviderUpdateCallback]
+
+	link     string
+	enabled  bool
+	timeout  time.Duration
+	interval time.Duration
+}
+
+func NewAdapter(ctx context.Context, router adapter.Router, outbound adapter.OutboundManager, logFactory log.Factory, logger log.ContextLogger, providerTag string, providerType string, options option.ProviderHealthCheckOptions) Adapter {
+	timeout := time.Duration(options.Timeout)
+	if timeout == 0 {
+		timeout = 3 * time.Second
+	}
+	interval := time.Duration(options.Interval)
+	if interval == 0 {
+		interval = 10 * time.Minute
+	}
+	if interval < time.Minute {
+		interval = time.Minute
+	}
+	return Adapter{
+		ctx:          ctx,
+		outbound:     outbound,
+		router:       router,
+		logFactory:   logFactory,
+		logger:       logger,
+		providerType: providerType,
+		providerTag:  providerTag,
+
+		enabled:  options.Enabled,
+		link:     options.URL,
+		timeout:  timeout,
+		interval: interval,
+	}
+}
+
+func (a *Adapter) Start() error {
+	a.history = service.FromContext[adapter.URLTestHistoryStorage](a.ctx)
+	if a.history == nil {
+		if clashServer := service.FromContext[adapter.ClashServer](a.ctx); clashServer != nil {
+			a.history = clashServer.HistoryStorage()
+		} else {
+			a.history = urltest.NewHistoryStorage()
+		}
+	}
+	go a.loopCheck()
+	return nil
+}
+
+func (a *Adapter) Type() string {
+	return a.providerType
+}
+
+func (a *Adapter) Tag() string {
+	return a.providerTag
+}
+
+func (a *Adapter) Outbounds() []adapter.Outbound {
+	return a.outbounds
+}
+
+func (a *Adapter) Outbound(tag string) (adapter.Outbound, bool) {
+	if a.outboundsByTag == nil {
+		return nil, false
+	}
+	detour, ok := a.outboundsByTag[tag]
+	return detour, ok
+}
+
+func (a *Adapter) UpdateOutbounds(oldOpts []option.Outbound, newOpts []option.Outbound) {
+	a.removeUseless(newOpts)
+	var (
+		oldOptByTag    = make(map[string]option.Outbound)
+		outbounds      = make([]adapter.Outbound, 0, len(newOpts))
+		outboundsByTag = make(map[string]adapter.Outbound)
+	)
+	for _, opt := range oldOpts {
+		oldOptByTag[opt.Tag] = opt
+	}
+	for i, opt := range newOpts {
+		var tag string
+		if opt.Tag != "" {
+			tag = F.ToString(a.providerTag, "/", opt.Tag)
+		} else {
+			tag = F.ToString(a.providerTag, "/", i)
+		}
+		outbound, exist := a.outbound.Outbound(tag)
+		if !exist || !reflect.DeepEqual(opt, oldOptByTag[opt.Tag]) {
+			err := a.outbound.Create(
+				adapter.WithContext(a.ctx, &adapter.InboundContext{
+					Outbound: tag,
+				}),
+				a.router,
+				a.logFactory.NewLogger(F.ToString("outbound/", opt.Type, "[", tag, "]")),
+				tag,
+				opt.Type,
+				opt.Options,
+			)
+			if err != nil {
+				a.logger.Warn(err, " in ", tag, ", skip create this outbound")
+				continue
+			}
+			outbound, _ = a.outbound.Outbound(tag)
+		}
+		outbounds = append(outbounds, outbound)
+		outboundsByTag[tag] = outbound
+	}
+	if a.enabled && a.history != nil {
+		go a.HealthCheck(a.ctx)
+	}
+	a.outbounds = outbounds
+	a.outboundsByTag = outboundsByTag
+}
+
+func (a *Adapter) HealthCheck(ctx context.Context) (map[string]uint16, error) {
+	if a.ticker != nil {
+		a.ticker.Reset(a.interval)
+	}
+	return a.healthcheck(ctx)
+}
+
+func (a *Adapter) RegisterCallback(callback adapter.ProviderUpdateCallback) *list.Element[adapter.ProviderUpdateCallback] {
+	a.callbackAccess.Lock()
+	defer a.callbackAccess.Unlock()
+	return a.callbacks.PushBack(callback)
+}
+
+func (a *Adapter) UnregisterCallback(element *list.Element[adapter.ProviderUpdateCallback]) {
+	a.callbackAccess.Lock()
+	defer a.callbackAccess.Unlock()
+	a.callbacks.Remove(element)
+}
+
+func (a *Adapter) UpdateGroups() {
+	for element := a.callbacks.Front(); element != nil; element = element.Next() {
+		element.Value(a.providerTag)
+	}
+}
+
+func (a *Adapter) Close() error {
+	if a.ticker != nil {
+		a.ticker.Stop()
+	}
+	outbounds := a.outbounds
+	a.outbounds = nil
+	var err error
+	for _, ob := range outbounds {
+		if err2 := a.outbound.Remove(ob.Tag()); err2 != nil {
+			err = E.Append(err, err2, func(err error) error {
+				return E.Cause(err, "close outbound [", ob.Tag(), "]")
+			})
+		}
+	}
+	return err
+}
+
+func (a *Adapter) loopCheck() {
+	if !a.enabled {
+		return
+	}
+	a.ticker = time.NewTicker(a.interval)
+	a.healthcheck(a.ctx)
+	for {
+		select {
+		case <-a.ctx.Done():
+			return
+		case <-a.ticker.C:
+			a.healthcheck(a.ctx)
+		}
+	}
+}
+
+func (a *Adapter) healthcheck(ctx context.Context) (map[string]uint16, error) {
+	result := make(map[string]uint16)
+	if a.checking.Swap(true) {
+		return result, nil
+	}
+	defer a.checking.Store(false)
+	b, _ := batch.New(ctx, batch.WithConcurrencyNum[any](10))
+	var resultAccess sync.Mutex
+	checked := make(map[string]bool)
+	for _, detour := range a.outbounds {
+		tag := detour.Tag()
+		if checked[tag] {
+			continue
+		}
+		checked[tag] = true
+		b.Go(tag, func() (any, error) {
+			ctx, cancel := context.WithTimeout(a.ctx, a.timeout)
+			defer cancel()
+			t, err := urltest.URLTest(ctx, a.link, detour)
+			if err != nil {
+				a.logger.Debug("outbound ", tag, " unavailable: ", err)
+				a.history.DeleteURLTestHistory(tag)
+			} else {
+				a.logger.Debug("outbound ", tag, " available: ", t, "ms")
+				a.history.StoreURLTestHistory(tag, &adapter.URLTestHistory{
+					Time:  time.Now(),
+					Delay: t,
+				})
+				resultAccess.Lock()
+				result[tag] = t
+				resultAccess.Unlock()
+			}
+			return nil, nil
+		})
+	}
+	b.Wait()
+	return result, nil
+}
+
+func (a *Adapter) removeUseless(newOpts []option.Outbound) {
+	if len(a.outbounds) == 0 {
+		return
+	}
+	exists := make(map[string]bool)
+	for i, opt := range newOpts {
+		var tag string
+		if opt.Tag != "" {
+			tag = F.ToString(a.providerTag, "/", opt.Tag)
+		} else {
+			tag = F.ToString(a.providerTag, "/", i)
+		}
+		exists[tag] = true
+	}
+	for _, opt := range a.outbounds {
+		if !exists[opt.Tag()] {
+			if err := a.outbound.Remove(opt.Tag()); err != nil {
+				a.logger.Error(err, "close outbound [", opt.Tag(), "]")
+			}
+		}
+	}
+}

adapter/provider/manager.go

@@ -0,0 +1,157 @@
+package provider
+
+import (
+	"context"
+	"io"
+	"os"
+	"sync"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/taskmonitor"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+)
+
+var _ adapter.ProviderManager = (*Manager)(nil)
+
+type Manager struct {
+	logger        log.ContextLogger
+	registry      adapter.ProviderRegistry
+	access        sync.Mutex
+	started       bool
+	stage         adapter.StartStage
+	providers     []adapter.Provider
+	providerByTag map[string]adapter.Provider
+	wg            sync.WaitGroup
+}
+
+func NewManager(logger logger.ContextLogger, registry adapter.ProviderRegistry) *Manager {
+	return &Manager{
+		logger:        logger,
+		registry:      registry,
+		providerByTag: make(map[string]adapter.Provider),
+	}
+}
+
+func (m *Manager) Initialize() {
+}
+
+func (m *Manager) Start(stage adapter.StartStage) error {
+	m.access.Lock()
+	if m.started && m.stage >= stage {
+		panic("already started")
+	}
+	m.started = true
+	m.stage = stage
+	providers := m.providers
+	m.access.Unlock()
+	for _, provider := range providers {
+		err := adapter.LegacyStart(provider, stage)
+		if err != nil {
+			return E.Cause(err, stage, " provider/", provider.Type(), "[", provider.Tag(), "]")
+		}
+	}
+	return nil
+}
+
+func (m *Manager) Close() error {
+	monitor := taskmonitor.New(m.logger, C.StopTimeout)
+	m.access.Lock()
+	if !m.started {
+		m.access.Unlock()
+		return nil
+	}
+	m.started = false
+	providers := m.providers
+	m.providers = nil
+	m.access.Unlock()
+	var err error
+	for _, provider := range providers {
+		if closer, isCloser := provider.(io.Closer); isCloser {
+			monitor.Start("close provider/", provider.Type(), "[", provider.Tag(), "]")
+			err = E.Append(err, closer.Close(), func(err error) error {
+				return E.Cause(err, "close provider/", provider.Type(), "[", provider.Tag(), "]")
+			})
+			monitor.Finish()
+		}
+	}
+	return nil
+}
+
+func (m *Manager) Providers() []adapter.Provider {
+	m.access.Lock()
+	defer m.access.Unlock()
+	return m.providers
+}
+
+func (m *Manager) Get(tag string) (adapter.Provider, bool) {
+	m.access.Lock()
+	provider, found := m.providerByTag[tag]
+	m.access.Unlock()
+	return provider, found
+}
+
+func (m *Manager) Remove(tag string) error {
+	m.access.Lock()
+	provider, found := m.providerByTag[tag]
+	if !found {
+		m.access.Unlock()
+		return os.ErrInvalid
+	}
+	delete(m.providerByTag, tag)
+	index := common.Index(m.providers, func(it adapter.Provider) bool {
+		return it == provider
+	})
+	if index == -1 {
+		panic("invalid provider index")
+	}
+	m.providers = append(m.providers[:index], m.providers[index+1:]...)
+	started := m.started
+	m.access.Unlock()
+	if started {
+		return common.Close(provider)
+	}
+	return nil
+}
+
+func (m *Manager) Create(ctx context.Context, router adapter.Router, logFactory log.Factory, tag string, providerType string, options any) error {
+	if tag == "" {
+		return os.ErrInvalid
+	}
+
+	provider, err := m.registry.CreateProvider(ctx, router, logFactory, tag, providerType, options)
+	if err != nil {
+		return err
+	}
+	m.access.Lock()
+	defer m.access.Unlock()
+	if m.started {
+		for _, stage := range adapter.ListStartStages {
+			err = adapter.LegacyStart(provider, stage)
+			if err != nil {
+				return E.Cause(err, stage, " provider/", provider.Type(), "[", provider.Tag(), "]")
+			}
+		}
+	}
+	if existsProvider, loaded := m.providerByTag[tag]; loaded {
+		if m.started {
+			err = common.Close(existsProvider)
+			if err != nil {
+				return E.Cause(err, "close provider", provider.Type(), "[", existsProvider.Tag(), "]")
+			}
+		}
+		existsIndex := common.Index(m.providers, func(it adapter.Provider) bool {
+			return it == existsProvider
+		})
+		if existsIndex == -1 {
+			panic("invalid provider index")
+		}
+		m.providers = append(m.providers[:existsIndex], m.providers[existsIndex+1:]...)
+	}
+	m.providers = append(m.providers, provider)
+	m.providerByTag[tag] = provider
+	return nil
+}

adapter/provider/registry.go

@@ -0,0 +1,72 @@
+package provider
+
+import (
+	"context"
+	"sync"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+type ConstructorFunc[T any] func(ctx context.Context, router adapter.Router, logFactory log.Factory, tag string, options T) (adapter.Provider, error)
+
+func Register[Options any](registry *Registry, providerType string, constructor ConstructorFunc[Options]) {
+	registry.register(providerType, func() any {
+		return new(Options)
+	}, func(ctx context.Context, router adapter.Router, logFactory log.Factory, tag string, rawOptions any) (adapter.Provider, error) {
+		var options *Options
+		if rawOptions != nil {
+			options = rawOptions.(*Options)
+		}
+		return constructor(ctx, router, logFactory, tag, common.PtrValueOrDefault(options))
+	})
+}
+
+var _ adapter.ProviderRegistry = (*Registry)(nil)
+
+type (
+	optionsConstructorFunc func() any
+	constructorFunc        func(ctx context.Context, router adapter.Router, logFactory log.Factory, tag string, options any) (adapter.Provider, error)
+)
+
+type Registry struct {
+	access       sync.Mutex
+	optionsType  map[string]optionsConstructorFunc
+	constructors map[string]constructorFunc
+}
+
+func NewRegistry() *Registry {
+	return &Registry{
+		optionsType:  make(map[string]optionsConstructorFunc),
+		constructors: make(map[string]constructorFunc),
+	}
+}
+
+func (r *Registry) CreateOptions(providerType string) (any, bool) {
+	r.access.Lock()
+	defer r.access.Unlock()
+	optionsConstructor, loaded := r.optionsType[providerType]
+	if !loaded {
+		return nil, false
+	}
+	return optionsConstructor(), true
+}
+
+func (r *Registry) CreateProvider(ctx context.Context, router adapter.Router, logFactory log.Factory, tag string, providerType string, options any) (adapter.Provider, error) {
+	r.access.Lock()
+	defer r.access.Unlock()
+	constructor, loaded := r.constructors[providerType]
+	if !loaded {
+		return nil, E.New("provider type not found: '" + providerType + "'")
+	}
+	return constructor(ctx, router, logFactory, tag, options)
+}
+
+func (r *Registry) register(providerType string, optionsConstructor optionsConstructorFunc, constructor constructorFunc) {
+	r.access.Lock()
+	defer r.access.Unlock()
+	r.optionsType[providerType] = optionsConstructor
+	r.constructors[providerType] = constructor
+}

box.go

@@ -12,11 +12,13 @@ import (
 	"github.com/sagernet/sing-box/adapter/endpoint"
 	"github.com/sagernet/sing-box/adapter/inbound"
 	"github.com/sagernet/sing-box/adapter/outbound"
+	"github.com/sagernet/sing-box/adapter/provider"
 	boxService "github.com/sagernet/sing-box/adapter/service"
 	"github.com/sagernet/sing-box/common/certificate"
 	"github.com/sagernet/sing-box/common/dialer"
 	"github.com/sagernet/sing-box/common/taskmonitor"
 	"github.com/sagernet/sing-box/common/tls"
+	"github.com/sagernet/sing-box/common/urltest"
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/dns"
 	"github.com/sagernet/sing-box/experimental"
@@ -43,6 +45,7 @@ type Box struct {
 	endpoint        *endpoint.Manager
 	inbound         *inbound.Manager
 	outbound        *outbound.Manager
+	provider        *provider.Manager
 	service         *boxService.Manager
 	dnsTransport    *dns.TransportManager
 	dnsRouter       *dns.Router
@@ -63,6 +66,7 @@ func Context(
 	inboundRegistry adapter.InboundRegistry,
 	outboundRegistry adapter.OutboundRegistry,
 	endpointRegistry adapter.EndpointRegistry,
+	providerRegistry adapter.ProviderRegistry,
 	dnsTransportRegistry adapter.DNSTransportRegistry,
 	serviceRegistry adapter.ServiceRegistry,
 ) context.Context {
@@ -81,6 +85,11 @@ func Context(
 		ctx = service.ContextWith[option.EndpointOptionsRegistry](ctx, endpointRegistry)
 		ctx = service.ContextWith[adapter.EndpointRegistry](ctx, endpointRegistry)
 	}
+	if service.FromContext[option.ProviderOptionsRegistry](ctx) == nil ||
+		service.FromContext[adapter.ProviderRegistry](ctx) == nil {
+		ctx = service.ContextWith[option.ProviderOptionsRegistry](ctx, providerRegistry)
+		ctx = service.ContextWith[adapter.ProviderRegistry](ctx, providerRegistry)
+	}
 	if service.FromContext[adapter.DNSTransportRegistry](ctx) == nil {
 		ctx = service.ContextWith[option.DNSTransportOptionsRegistry](ctx, dnsTransportRegistry)
 		ctx = service.ContextWith[adapter.DNSTransportRegistry](ctx, dnsTransportRegistry)
@@ -103,6 +112,7 @@ func New(options Options) (*Box, error) {
 	endpointRegistry := service.FromContext[adapter.EndpointRegistry](ctx)
 	inboundRegistry := service.FromContext[adapter.InboundRegistry](ctx)
 	outboundRegistry := service.FromContext[adapter.OutboundRegistry](ctx)
+	providerRegistry := service.FromContext[adapter.ProviderRegistry](ctx)
 	dnsTransportRegistry := service.FromContext[adapter.DNSTransportRegistry](ctx)
 	serviceRegistry := service.FromContext[adapter.ServiceRegistry](ctx)
 
@@ -115,6 +125,9 @@ func New(options Options) (*Box, error) {
 	if outboundRegistry == nil {
 		return nil, E.New("missing outbound registry in context")
 	}
+	if providerRegistry == nil {
+		return nil, E.New("missing provider registry in context")
+	}
 	if dnsTransportRegistry == nil {
 		return nil, E.New("missing DNS transport registry in context")
 	}
@@ -140,6 +153,9 @@ func New(options Options) (*Box, error) {
 	if experimentalOptions.V2RayAPI != nil && experimentalOptions.V2RayAPI.Listen != "" {
 		needV2RayAPI = true
 	}
+	if experimentalOptions.UnifiedDelay != nil && experimentalOptions.UnifiedDelay.Enabled {
+		ctx = urltest.ContextWithIsUnifiedDelay(ctx)
+	}
 	platformInterface := service.FromContext[adapter.PlatformInterface](ctx)
 	var defaultLogWriter io.Writer
 	if platformInterface != nil {
@@ -156,6 +172,7 @@ func New(options Options) (*Box, error) {
 	if err != nil {
 		return nil, E.Cause(err, "create log factory")
 	}
+	service.MustRegister[log.Factory](ctx, logFactory)
 
 	var internalServices []adapter.LifecycleService
 	certificateOptions := common.PtrValueOrDefault(options.Certificate)
@@ -176,11 +193,13 @@ func New(options Options) (*Box, error) {
 	endpointManager := endpoint.NewManager(logFactory.NewLogger("endpoint"), endpointRegistry)
 	inboundManager := inbound.NewManager(logFactory.NewLogger("inbound"), inboundRegistry, endpointManager)
 	outboundManager := outbound.NewManager(logFactory.NewLogger("outbound"), outboundRegistry, endpointManager, routeOptions.Final)
+	providerManager := provider.NewManager(logFactory.NewLogger("provider"), providerRegistry)
 	dnsTransportManager := dns.NewTransportManager(logFactory.NewLogger("dns/transport"), dnsTransportRegistry, outboundManager, dnsOptions.Final)
 	serviceManager := boxService.NewManager(logFactory.NewLogger("service"), serviceRegistry)
 	service.MustRegister[adapter.EndpointManager](ctx, endpointManager)
 	service.MustRegister[adapter.InboundManager](ctx, inboundManager)
 	service.MustRegister[adapter.OutboundManager](ctx, outboundManager)
+	service.MustRegister[adapter.ProviderManager](ctx, providerManager)
 	service.MustRegister[adapter.DNSTransportManager](ctx, dnsTransportManager)
 	service.MustRegister[adapter.ServiceManager](ctx, serviceManager)
 	dnsRouter := dns.NewRouter(ctx, logFactory, dnsOptions)
@@ -271,6 +290,10 @@ func New(options Options) (*Box, error) {
 			return nil, E.Cause(err, "initialize inbound[", i, "]")
 		}
 	}
+	options.Outbounds = append(options.Outbounds, option.Outbound{
+		Tag:  "Compatible",
+		Type: C.TypeDirect,
+	})
 	for i, outboundOptions := range options.Outbounds {
 		var tag string
 		if outboundOptions.Tag != "" {
@@ -297,6 +320,25 @@ func New(options Options) (*Box, error) {
 			return nil, E.Cause(err, "initialize outbound[", i, "]")
 		}
 	}
+	for i, providerOptions := range options.Providers {
+		var tag string
+		if providerOptions.Tag != "" {
+			tag = providerOptions.Tag
+		} else {
+			tag = F.ToString(i)
+		}
+		err = providerManager.Create(
+			ctx,
+			router,
+			logFactory,
+			tag,
+			providerOptions.Type,
+			providerOptions.Options,
+		)
+		if err != nil {
+			return nil, E.Cause(err, "initialize provider[", i, "]")
+		}
+	}
 	for i, serviceOptions := range options.Services {
 		var tag string
 		if serviceOptions.Tag != "" {
@@ -387,6 +429,7 @@ func New(options Options) (*Box, error) {
 		endpoint:        endpointManager,
 		inbound:         inboundManager,
 		outbound:        outboundManager,
+		provider:        providerManager,
 		dnsTransport:    dnsTransportManager,
 		service:         serviceManager,
 		dnsRouter:       dnsRouter,
@@ -450,11 +493,11 @@ func (s *Box) preStart() error {
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(s.logger, adapter.StartStateInitialize, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.outbound, s.inbound, s.endpoint, s.service)
+	err = adapter.Start(s.logger, adapter.StartStateInitialize, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.outbound, s.inbound, s.endpoint, s.provider, s.service)
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(s.logger, adapter.StartStateStart, s.outbound, s.dnsTransport, s.dnsRouter, s.network, s.connection, s.router)
+	err = adapter.Start(s.logger, adapter.StartStateStart, s.outbound, s.provider, s.dnsTransport, s.dnsRouter, s.network, s.connection, s.router)
 	if err != nil {
 		return err
 	}
@@ -474,7 +517,7 @@ func (s *Box) start() error {
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(s.logger, adapter.StartStatePostStart, s.outbound, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.inbound, s.endpoint, s.service)
+	err = adapter.Start(s.logger, adapter.StartStatePostStart, s.outbound, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.inbound, s.endpoint, s.provider, s.service)
 	if err != nil {
 		return err
 	}
@@ -482,7 +525,7 @@ func (s *Box) start() error {
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(s.logger, adapter.StartStateStarted, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.outbound, s.inbound, s.endpoint, s.service)
+	err = adapter.Start(s.logger, adapter.StartStateStarted, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.outbound, s.inbound, s.endpoint, s.provider, s.service)
 	if err != nil {
 		return err
 	}
@@ -508,6 +551,7 @@ func (s *Box) Close() error {
 		{"service", s.service},
 		{"endpoint", s.endpoint},
 		{"inbound", s.inbound},
+		{"provider", s.provider},
 		{"outbound", s.outbound},
 		{"router", s.router},
 		{"connection", s.connection},

cmd/internal/admin_panel_pack/main.go

@@ -0,0 +1,194 @@
+// Command admin_panel_pack post-processes a directory of built SPA
+// assets so it can be served straight from the Go binary via //go:embed.
+// It does *not* generate any Go source any more — that responsibility
+// moved to the embed directive in service/admin_panel/service.go.
+//
+// Three transformations happen here, all in-place inside the supplied
+// directory:
+//
+//  1. Legacy WOFF (1.0) fallback fonts are deleted. Every browser made
+//     after 2014 reads WOFF2 natively, so shipping both formats roughly
+//     doubles the embedded font payload for no real-world benefit. The
+//     matching `,url(*.woff) format("woff")` segments are stripped from
+//     the bundled CSS in step (2) so the @font-face rules don't reference
+//     files that aren't shipped.
+//  2. Bundled CSS is rewritten to drop those WOFF URL fragments.
+//  3. Compressible text assets (.html, .css, .js, .svg, .json, .map) are
+//     pre-gzipped as companion `*.gz` files. The HTTP handler then either
+//     passes those bytes through verbatim with Content-Encoding: gzip or
+//     falls back to the raw file for the rare client that does not
+//     advertise gzip support — no on-line compression, no surprises.
+//     Already-compressed formats (.woff2, fonts, images) are skipped: gzip
+//     can't shrink them and the duplicate would only inflate the binary.
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	"flag"
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"time"
+)
+
+func main() {
+	dir := flag.String("dir", "service/admin_panel/dist", "directory of built SPA assets to post-process in place")
+	flag.Parse()
+
+	woffDropped, err := pruneWoff(*dir)
+	if err != nil {
+		fail("prune woff: %v", err)
+	}
+	cssRewritten, err := rewriteCSS(*dir)
+	if err != nil {
+		fail("rewrite css: %v", err)
+	}
+	stats, err := gzipText(*dir)
+	if err != nil {
+		fail("gzip text: %v", err)
+	}
+	fmt.Fprintf(os.Stderr, "post-processed %s: dropped %d woff, rewrote %d css, gzipped %d files (%d→%d bytes)\n",
+		*dir, woffDropped, cssRewritten, stats.gzipped, stats.totalRaw, stats.totalGz)
+}
+
+// pruneWoff deletes every legacy *.woff (WOFF 1.0) font under dir. The
+// bundled CSS still references them on entry; rewriteCSS drops those
+// references in a separate pass so the two operations stay independently
+// testable.
+func pruneWoff(dir string) (int, error) {
+	var n int
+	err := filepath.WalkDir(dir, func(p string, d fs.DirEntry, walkErr error) error {
+		if walkErr != nil {
+			return walkErr
+		}
+		if d.IsDir() || !strings.EqualFold(filepath.Ext(p), ".woff") {
+			return nil
+		}
+		if err := os.Remove(p); err != nil {
+			return err
+		}
+		n++
+		return nil
+	})
+	return n, err
+}
+
+// woffRefAfterRE / woffRefBeforeRE match a single WOFF 1.0 entry inside a
+// Vite-bundled CSS `src:` declaration. Vite minifies the rule to
+// `src:url(./X.woff2) format("woff2"),url(./X.woff) format("woff");` so the
+// "after" regex (the common case) eats the *leading* comma + woff entry,
+// leaving only the woff2 source. We also handle the rare reverse ordering
+// in a second pass.
+var (
+	woffRefAfterRE  = regexp.MustCompile(`,\s*url\([^)]*\.woff\)\s*format\(["']woff["']\)`)
+	woffRefBeforeRE = regexp.MustCompile(`url\([^)]*\.woff\)\s*format\(["']woff["']\)\s*,\s*`)
+)
+
+// rewriteCSS drops every reference to a *.woff URL from every *.css file
+// under dir. Pairs naturally with pruneWoff: after both passes, no font
+// URL in the bundle points at a file that isn't shipped.
+func rewriteCSS(dir string) (int, error) {
+	var n int
+	err := filepath.WalkDir(dir, func(p string, d fs.DirEntry, walkErr error) error {
+		if walkErr != nil {
+			return walkErr
+		}
+		if d.IsDir() || !strings.EqualFold(filepath.Ext(p), ".css") {
+			return nil
+		}
+		data, err := os.ReadFile(p)
+		if err != nil {
+			return err
+		}
+		out := woffRefAfterRE.ReplaceAll(data, nil)
+		out = woffRefBeforeRE.ReplaceAll(out, nil)
+		if bytes.Equal(out, data) {
+			return nil
+		}
+		if err := os.WriteFile(p, out, 0o644); err != nil {
+			return err
+		}
+		n++
+		return nil
+	})
+	return n, err
+}
+
+// gzipExts is the set of file extensions for which a `.gz` companion is
+// generated. Anything not on this list is left alone — woff2/png/jpeg/etc.
+// are already compressed, so gzip can only inflate them slightly while
+// doubling the embedded payload.
+var gzipExts = map[string]bool{
+	".html": true,
+	".css":  true,
+	".js":   true,
+	".mjs":  true,
+	".svg":  true,
+	".json": true,
+	".map":  true,
+	".txt":  true,
+	".xml":  true,
+	".wasm": true,
+}
+
+type gzipStats struct {
+	gzipped  int
+	totalRaw int64
+	totalGz  int64
+}
+
+// gzipText produces a `<file>.gz` companion next to every text-like asset
+// in dir, using gzip.BestCompression. The companion is dropped if the
+// compressed bytes don't save at least 10 % over the raw file — same
+// heuristic we used in the previous (Go-source-emitting) generation, just
+// applied to disk files now.
+func gzipText(dir string) (gzipStats, error) {
+	var stats gzipStats
+	err := filepath.WalkDir(dir, func(p string, d fs.DirEntry, walkErr error) error {
+		if walkErr != nil {
+			return walkErr
+		}
+		if d.IsDir() {
+			return nil
+		}
+		ext := strings.ToLower(filepath.Ext(p))
+		if ext == ".gz" || !gzipExts[ext] {
+			return nil
+		}
+		raw, err := os.ReadFile(p)
+		if err != nil {
+			return err
+		}
+		var buf bytes.Buffer
+		w, err := gzip.NewWriterLevel(&buf, gzip.BestCompression)
+		if err != nil {
+			return err
+		}
+		// Reproducible: no mtime, no OS marker.
+		w.ModTime = time.Time{}
+		w.OS = 0xff
+		if _, err := w.Write(raw); err != nil {
+			return err
+		}
+		if err := w.Close(); err != nil {
+			return err
+		}
+		if buf.Len() > len(raw)*9/10 {
+			return nil
+		}
+		stats.gzipped++
+		stats.totalRaw += int64(len(raw))
+		stats.totalGz += int64(buf.Len())
+		return os.WriteFile(p+".gz", buf.Bytes(), 0o644)
+	})
+	return stats, err
+}
+
+func fail(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, "admin_panel_pack: "+format+"\n", args...)
+	os.Exit(1)
+}

cmd/internal/build_libbox/main.go

@@ -63,7 +63,7 @@ func init() {
 	sharedFlags = append(sharedFlags, "-ldflags", "-X github.com/sagernet/sing-box/constant.Version="+currentTag+" -X internal/godebug.defaultGODEBUG=multipathtcp=0 -s -w -buildid=  -checklinkname=0")
 	debugFlags = append(debugFlags, "-ldflags", "-X github.com/sagernet/sing-box/constant.Version="+currentTag+" -X internal/godebug.defaultGODEBUG=multipathtcp=0 -checklinkname=0")
 
-	sharedTags = append(sharedTags, "with_gvisor", "with_quic", "with_wireguard", "with_utls", "with_naive_outbound", "with_clash_api", "badlinkname", "tfogo_checklinkname0")
+	sharedTags = append(sharedTags, "with_gvisor", "with_quic", "with_wireguard", "with_masque", "with_mtproxy", "with_utls", "with_naive_outbound", "with_clash_api", "badlinkname", "tfogo_checklinkname0")
 	darwinTags = append(darwinTags, "with_dhcp", "grpcnotrace")
 	// memcTags = append(memcTags, "with_tailscale")
 	sharedTags = append(sharedTags, "with_tailscale", "ts_omit_logtail", "ts_omit_ssh", "ts_omit_drive", "ts_omit_taildrop", "ts_omit_webclient", "ts_omit_doctor", "ts_omit_capture", "ts_omit_kube", "ts_omit_aws", "ts_omit_synology", "ts_omit_bird")

cmd/sing-box/cmd_tools_fetch_http3.go

@@ -1,5 +1,3 @@
-//go:build with_quic
-
 package main
 
 import (

common/badtls/raw_half_conn.go

@@ -29,7 +29,7 @@ type RawHalfConn struct {
 
 func NewRawHalfConn(rawHalfConn reflect.Value, methods *Methods) (*RawHalfConn, error) {
 	halfConn := &RawHalfConn{
-		pointer: (unsafe.Pointer)(rawHalfConn.UnsafeAddr()),
+		pointer: unsafe.Pointer(rawHalfConn.UnsafeAddr()),
 		methods: methods,
 	}
 

common/byteformats/formats.go

@@ -0,0 +1,74 @@
+package byteformats
+
+import (
+	"fmt"
+	"math"
+)
+
+var (
+	unitNames   = []string{"B", "kB", "MB", "GB", "TB", "PB", "EB"}
+	iUnitNames  = []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"}
+	kUnitNames  = []string{"kB", "MB", "GB", "TB", "PB", "EB"}
+	kiUnitNames = []string{"KiB", "MiB", "GiB", "TiB", "PiB", "EiB"}
+)
+
+func formatBytes(s uint64, base float64, sizes []string) string {
+	if s < 10 {
+		return fmt.Sprintf("%d B", s)
+	}
+	e := math.Floor(logn(float64(s), base))
+	suffix := sizes[int(e)]
+	val := math.Floor(float64(s)/math.Pow(base, e)*10+0.5) / 10
+	f := "%.0f %s"
+	if val < 10 {
+		f = "%.1f %s"
+	}
+
+	return fmt.Sprintf(f, val, suffix)
+}
+
+func formatKBytes(s uint64, base float64, sizes []string) string {
+	if s == 0 {
+		return fmt.Sprintf("0 %s", sizes[0])
+	}
+	e := math.Floor(logn(float64(s), base))
+	if e < 1 {
+		e = 1
+	}
+	suffix := sizes[int(e)-1]
+	val := math.Floor(float64(s)/math.Pow(base, e)*10+0.5) / 10
+	f := "%.0f %s"
+	if val < 10 {
+		f = "%.1f %s"
+	}
+
+	return fmt.Sprintf(f, val, suffix)
+}
+
+func logn(n, b float64) float64 {
+	return math.Log(n) / math.Log(b)
+}
+
+func FormatBytes(s uint64) string {
+	return formatBytes(s, 1000, unitNames)
+}
+
+func FormatMemoryBytes(s uint64) string {
+	return formatBytes(s, 1024, unitNames)
+}
+
+func FormatIBytes(s uint64) string {
+	return formatBytes(s, 1024, iUnitNames)
+}
+
+func FormatKBytes(s uint64) string {
+	return formatKBytes(s, 1000, kUnitNames)
+}
+
+func FormatMemoryKBytes(s uint64) string {
+	return formatKBytes(s, 1024, kUnitNames)
+}
+
+func FormatKIBytes(s uint64) string {
+	return formatKBytes(s, 1024, kiUnitNames)
+}

common/byteformats/json.go

@@ -0,0 +1,218 @@
+package byteformats
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+const (
+	Byte = 1 << (iota * 10)
+	KiByte
+	MiByte
+	GiByte
+	TiByte
+	PiByte
+	EiByte
+)
+
+const (
+	KByte = Byte * 1000
+	MByte = KByte * 1000
+	GByte = MByte * 1000
+	TByte = GByte * 1000
+	PByte = TByte * 1000
+	EByte = PByte * 1000
+)
+
+var unitValueTable = map[string]uint64{
+	"b":   Byte,
+	"k":   KByte,
+	"kb":  KByte,
+	"ki":  KiByte,
+	"kib": KiByte,
+	"m":   MByte,
+	"mb":  MByte,
+	"mi":  MiByte,
+	"mib": MiByte,
+	"g":   GByte,
+	"gb":  GByte,
+	"gi":  GiByte,
+	"gib": GiByte,
+	"t":   TByte,
+	"tb":  TByte,
+	"ti":  TiByte,
+	"tib": TiByte,
+	"p":   PByte,
+	"pb":  PByte,
+	"pi":  PiByte,
+	"pib": PiByte,
+	"e":   EByte,
+	"eb":  EByte,
+	"ei":  EiByte,
+	"eib": EiByte,
+}
+
+var memoryUnitValueTable = map[string]uint64{
+	"b":  Byte,
+	"k":  KiByte,
+	"kb": KiByte,
+	"m":  MiByte,
+	"mb": MiByte,
+	"g":  GiByte,
+	"gb": GiByte,
+	"t":  TiByte,
+	"tb": TiByte,
+	"p":  PiByte,
+	"pb": PiByte,
+	"e":  EiByte,
+	"eb": EiByte,
+}
+
+var networkUnitValueTable = map[string]uint64{
+	"Bps":  Byte,
+	"Kbps": KByte / 8,
+	"KBps": KByte,
+	"Mbps": MByte / 8,
+	"MBps": MByte,
+	"Gbps": GByte / 8,
+	"GBps": GByte,
+	"Tbps": TByte / 8,
+	"TBps": TByte,
+	"Pbps": PByte / 8,
+	"PBps": PByte,
+	"Ebps": EByte / 8,
+	"EBps": EByte,
+}
+
+type rawBytes struct {
+	value     uint64
+	unit      string
+	unitValue uint64
+}
+
+func (b rawBytes) MarshalJSON() ([]byte, error) {
+	if b.unit == "" {
+		return json.Marshal(b.value)
+	}
+	return json.Marshal(strconv.FormatUint(b.value/b.unitValue, 10) + b.unit)
+}
+
+func parseUnit(b *rawBytes, unitTable map[string]uint64, caseSensitive bool, bytes []byte) error {
+	var intValue int64
+	err := json.Unmarshal(bytes, &intValue)
+	if err == nil {
+		b.value = uint64(intValue)
+		b.unit = ""
+		b.unitValue = 1
+		return nil
+	}
+	var stringValue string
+	err = json.Unmarshal(bytes, &stringValue)
+	if err != nil {
+		return err
+	}
+	if strings.TrimSpace(stringValue) == "" {
+		b.value = 0
+		b.unit = ""
+		b.unitValue = 1
+		return nil
+	}
+	unitIndex := 0
+	for i, c := range stringValue {
+		if c < '0' || c > '9' {
+			unitIndex = i
+			break
+		}
+	}
+	if unitIndex == 0 {
+		return fmt.Errorf("invalid format: %s", stringValue)
+	}
+	value, err := strconv.ParseUint(stringValue[:unitIndex], 10, 64)
+	if err != nil {
+		return fmt.Errorf("parse %s: %w", stringValue[:unitIndex], err)
+	}
+	rawUnit := stringValue[unitIndex:]
+	var unit string
+	if caseSensitive {
+		unit = strings.TrimSpace(rawUnit)
+	} else {
+		unit = strings.TrimSpace(strings.ToLower(rawUnit))
+	}
+	unitValue, loaded := unitTable[unit]
+	if !loaded {
+		return fmt.Errorf("unsupported unit: %s", rawUnit)
+	}
+	b.value = value * unitValue
+	b.unit = rawUnit
+	b.unitValue = unitValue
+	return nil
+}
+
+type Bytes struct {
+	rawBytes
+}
+
+func (b *Bytes) Value() uint64 {
+	if b == nil {
+		return 0
+	}
+	return b.value
+}
+
+func (b *Bytes) UnmarshalJSON(bytes []byte) error {
+	return parseUnit(&b.rawBytes, unitValueTable, false, bytes)
+}
+
+type MemoryBytes struct {
+	rawBytes
+}
+
+func (m *MemoryBytes) Value() uint64 {
+	if m == nil {
+		return 0
+	}
+	return m.value
+}
+
+func (m *MemoryBytes) UnmarshalJSON(bytes []byte) error {
+	return parseUnit(&m.rawBytes, memoryUnitValueTable, false, bytes)
+}
+
+type NetworkBytes struct {
+	rawBytes
+}
+
+func (n *NetworkBytes) Value() uint64 {
+	if n == nil {
+		return 0
+	}
+	return n.value
+}
+
+func (n *NetworkBytes) UnmarshalJSON(bytes []byte) error {
+	return parseUnit(&n.rawBytes, networkUnitValueTable, true, bytes)
+}
+
+type NetworkBytesCompat struct {
+	rawBytes
+}
+
+func (n *NetworkBytesCompat) Value() uint64 {
+	if n == nil {
+		return 0
+	}
+	return n.value
+}
+
+func (n *NetworkBytesCompat) UnmarshalJSON(bytes []byte) error {
+	err := parseUnit(&n.rawBytes, networkUnitValueTable, true, bytes)
+	if err != nil {
+		newErr := parseUnit(&n.rawBytes, unitValueTable, false, bytes)
+		if newErr == nil {
+			return nil
+		}
+	}
+	return err
+}

common/byteformats/json_test.go

@@ -0,0 +1,114 @@
+package byteformats_test
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/sagernet/sing-box/common/byteformats"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestNetworkBytes(t *testing.T) {
+	t.Parallel()
+	testMap := map[string]uint64{
+		"1 Bps":  byteformats.Byte,
+		"1 Kbps": byteformats.KByte / 8,
+		"1 KBps": byteformats.KByte,
+		"1 Mbps": byteformats.MByte / 8,
+		"1 MBps": byteformats.MByte,
+		"1 Gbps": byteformats.GByte / 8,
+		"1 GBps": byteformats.GByte,
+		"1 Tbps": byteformats.TByte / 8,
+		"1 TBps": byteformats.TByte,
+		"1 Pbps": byteformats.PByte / 8,
+		"1 PBps": byteformats.PByte,
+		"1k":     byteformats.KByte,
+		"1m":     byteformats.MByte,
+	}
+	for k, v := range testMap {
+		var nb byteformats.NetworkBytesCompat
+		require.NoError(t, json.Unmarshal([]byte("\""+k+"\""), &nb))
+		require.Equal(t, v, nb.Value())
+		b, err := json.Marshal(nb)
+		require.NoError(t, err)
+		require.Equal(t, "\""+k+"\"", string(b))
+	}
+}
+
+func TestMemoryBytes(t *testing.T) {
+	t.Parallel()
+	testMap := map[string]uint64{
+		"1 B":  byteformats.Byte,
+		"1 KB": byteformats.KiByte,
+		"1 MB": byteformats.MiByte,
+		"1 GB": byteformats.GiByte,
+		"1 TB": byteformats.TiByte,
+		"1 PB": byteformats.PiByte,
+	}
+	for k, v := range testMap {
+		var mb byteformats.MemoryBytes
+		require.NoError(t, json.Unmarshal([]byte("\""+k+"\""), &mb))
+		require.Equal(t, v, mb.Value())
+		b, err := json.Marshal(mb)
+		require.NoError(t, err)
+		require.Equal(t, "\""+k+"\"", string(b))
+	}
+}
+
+func TestDefaultBytes(t *testing.T) {
+	t.Parallel()
+	testMap := map[string]uint64{
+		"1 B":   byteformats.Byte,
+		"1 KB":  byteformats.KByte,
+		"1 KiB": byteformats.KiByte,
+		"1 MB":  byteformats.MByte,
+		"1 MiB": byteformats.MiByte,
+		"1 GB":  byteformats.GByte,
+		"1 GiB": byteformats.GiByte,
+		"1 TB":  byteformats.TByte,
+		"1 TiB": byteformats.TiByte,
+		"1 PB":  byteformats.PByte,
+		"1 PiB": byteformats.PiByte,
+		"1 EB":  byteformats.EByte,
+		"1 EiB": byteformats.EiByte,
+		"1k":    byteformats.KByte,
+		"1m":    byteformats.MByte,
+		"1g":    byteformats.GByte,
+		"1t":    byteformats.TByte,
+		"1p":    byteformats.PByte,
+		"1e":    byteformats.EByte,
+		"1K":    byteformats.KByte,
+		"1M":    byteformats.MByte,
+		"1G":    byteformats.GByte,
+		"1T":    byteformats.TByte,
+		"1P":    byteformats.PByte,
+		"1E":    byteformats.EByte,
+		"1Ki":   byteformats.KiByte,
+		"1Mi":   byteformats.MiByte,
+		"1Gi":   byteformats.GiByte,
+		"1Ti":   byteformats.TiByte,
+		"1Pi":   byteformats.PiByte,
+		"1Ei":   byteformats.EiByte,
+		"1KiB":  byteformats.KiByte,
+		"1MiB":  byteformats.MiByte,
+		"1GiB":  byteformats.GiByte,
+		"1TiB":  byteformats.TiByte,
+		"1PiB":  byteformats.PiByte,
+		"1EiB":  byteformats.EiByte,
+		"1kB":   byteformats.KByte,
+		"1mB":   byteformats.MByte,
+		"1gB":   byteformats.GByte,
+		"1tB":   byteformats.TByte,
+		"1pB":   byteformats.PByte,
+		"1eB":   byteformats.EByte,
+	}
+	for k, v := range testMap {
+		var mb byteformats.Bytes
+		require.NoError(t, json.Unmarshal([]byte("\""+k+"\""), &mb))
+		require.Equal(t, v, mb.Value())
+		b, err := json.Marshal(mb)
+		require.NoError(t, err)
+		require.Equal(t, "\""+k+"\"", string(b))
+	}
+}

common/cloudflare/api.go

@@ -0,0 +1,114 @@
+package cloudflare
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+type CloudflareApi struct {
+	client http.Client
+}
+
+func NewCloudflareApi(opts ...CloudflareApiOption) *CloudflareApi {
+	api := &CloudflareApi{http.Client{Timeout: 30 * time.Second}}
+	for _, opt := range opts {
+		opt(api)
+	}
+	return api
+}
+
+func (api *CloudflareApi) CreateProfile(ctx context.Context, publicKey string) (*CloudflareProfile, error) {
+	serial, err := GenerateRandomAndroidSerial()
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate serial: %v", err)
+	}
+	data := Registration{
+		Key:       publicKey,
+		InstallID: "",
+		FcmToken:  "",
+		Tos:       TimeAsCfString(time.Now()),
+		Model:     "PC",
+		Serial:    serial,
+		OsVersion: "",
+		KeyType:   KeyTypeWg,
+		TunType:   TunTypeWg,
+		Locale:    "en-US",
+	}
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal json: %v", err)
+	}
+	request, err := http.NewRequest("POST", ApiUrl+"/"+ApiVersion+"/reg", bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, err
+	}
+	for k, v := range Headers {
+		request.Header.Set(k, v)
+	}
+	response, err := api.client.Do(request.WithContext(ctx))
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("failed to register: %v", response.StatusCode)
+	}
+	profile := new(CloudflareProfile)
+	return profile, json.NewDecoder(response.Body).Decode(profile)
+}
+
+func (api *CloudflareApi) EnrollKey(ctx context.Context, authToken string, id string, keyType, tunType, publicKey string) (*CloudflareProfile, error) {
+	deviceUpdate := DeviceUpdate{
+		Name:    "PC",
+		Key:     publicKey,
+		KeyType: keyType,
+		TunType: tunType,
+	}
+	jsonData, err := json.Marshal(deviceUpdate)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal json: %v", err)
+	}
+	request, err := http.NewRequest("PATCH", ApiUrl+"/"+ApiVersion+"/reg/"+id, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, err
+	}
+	for k, v := range Headers {
+		request.Header.Set(k, v)
+	}
+	request.Header.Set("Authorization", "Bearer "+authToken)
+	response, err := api.client.Do(request.WithContext(ctx))
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("failed to enroll key: %v", response.StatusCode)
+	}
+	profile := new(CloudflareProfile)
+	return profile, json.NewDecoder(response.Body).Decode(profile)
+}
+
+func (api *CloudflareApi) GetProfile(ctx context.Context, authToken string, id string) (*CloudflareProfile, error) {
+	request, err := http.NewRequest("GET", ApiUrl+"/"+ApiVersion+"/reg/"+id, nil)
+	if err != nil {
+		return nil, err
+	}
+	for k, v := range Headers {
+		request.Header.Set(k, v)
+	}
+	request.Header.Set("Authorization", "Bearer "+authToken)
+	response, err := api.client.Do(request.WithContext(ctx))
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("failed to get profile: %v", response.StatusCode)
+	}
+	profile := new(CloudflareProfile)
+	return profile, json.NewDecoder(response.Body).Decode(profile)
+}

common/cloudflare/constant.go

@@ -0,0 +1,25 @@
+package cloudflare
+
+const (
+	ApiUrl     = "https://api.cloudflareclient.com"
+	ApiVersion = "v0a4471"
+	ConnectSNI = "consumer-masque.cloudflareclient.com"
+	// unused for now
+	ZeroTierSNI         = "zt-masque.cloudflareclient.com"
+	ConnectURI          = "https://cloudflareaccess.com"
+	DefaultModel        = "PC"
+	KeyTypeWg           = "curve25519"
+	TunTypeWg           = "wireguard"
+	KeyTypeMasque       = "secp256r1"
+	TunTypeMasque       = "masque"
+	DefaultLocale       = "en_US"
+	DefaultEndpointH2V4 = "162.159.198.2"
+	DefaultEndpointH2V6 = ""
+)
+
+var Headers = map[string]string{
+	"User-Agent":        "WARP for Android",
+	"CF-Client-Version": "a-6.35-4471",
+	"Content-Type":      "application/json; charset=UTF-8",
+	"Connection":        "Keep-Alive",
+}

common/cloudflare/models.go

@@ -0,0 +1,132 @@
+package cloudflare
+
+import (
+	"strings"
+)
+
+type Registration struct {
+	Key       string `json:"key"`
+	InstallID string `json:"install_id"`
+	FcmToken  string `json:"fcm_token"`
+	Tos       string `json:"tos"`
+	Model     string `json:"model"`
+	Serial    string `json:"serial_number"`
+	OsVersion string `json:"os_version"`
+	KeyType   string `json:"key_type"`
+	TunType   string `json:"tunnel_type"`
+	Locale    string `json:"locale"`
+}
+
+type CloudflareProfile struct {
+	ID      string  `json:"id"`
+	Type    string  `json:"type"`
+	Model   string  `json:"model"`
+	Name    string  `json:"name"`
+	Key     string  `json:"key"`
+	KeyType string  `json:"key_type"`
+	TunType string  `json:"tunnel_type"`
+	Account Account `json:"account"`
+	Config  Config  `json:"config"`
+	// WarpEnabled not set for ZeroTier
+	WarpEnabled bool `json:"warp_enabled,omitempty"`
+	// Waitlist not set for ZeroTier
+	Waitlist bool   `json:"waitlist_enabled,omitempty"`
+	Created  string `json:"created"`
+	Updated  string `json:"updated"`
+	// Tos not set for ZeroTier
+	Tos string `json:"tos,omitempty"`
+	// Place not set for ZeroTier
+	Place  int    `json:"place,omitempty"`
+	Locale string `json:"locale"`
+	// Enabled not set for ZeroTier
+	Enabled   bool   `json:"enabled,omitempty"`
+	InstallID string `json:"install_id"`
+	// Token only set for /reg call
+	Token    string `json:"token,omitempty"`
+	FcmToken string `json:"fcm_token"`
+	// SerialNumber not set for ZeroTier
+	SerialNumber string `json:"serial_number,omitempty"`
+	Policy       Policy `json:"policy"`
+}
+
+type Account struct {
+	ID          string `json:"id"`
+	AccountType string `json:"account_type"`
+	// Created not set for ZeroTier
+	Created string `json:"created,omitempty"`
+	// Updated not set for ZeroTier
+	Updated string `json:"updated,omitempty"`
+	// Managed only set for ZeroTier
+	Managed string `json:"managed,omitempty"`
+	// Organization only set for ZeroTier
+	Organization string `json:"organization,omitempty"`
+	// PremiumData not set for ZeroTier
+	PremiumData int `json:"premium_data,omitempty"`
+	// Quota not set for ZeroTier
+	Quota int `json:"quota,omitempty"`
+	// WarpPlus not set for ZeroTier
+	WarpPlus bool `json:"warp_plus,omitempty"`
+	// ReferralCode not set for ZeroTier
+	ReferralCount int `json:"referral_count,omitempty"`
+	// ReferralRenewalCount not set for ZeroTier
+	ReferralRenewalCount int `json:"referral_renewal_countdown,omitempty"`
+	// Role not set for ZeroTier
+	Role string `json:"role,omitempty"`
+	// License not set for ZeroTier
+	License string `json:"license,omitempty"`
+}
+
+type Config struct {
+	ClientID  string `json:"client_id"`
+	Peers     []Peer `json:"peers"`
+	Interface struct {
+		Addresses struct {
+			V4 string `json:"v4"`
+			V6 string `json:"v6"`
+		} `json:"addresses"`
+	} `json:"interface"`
+	Services struct {
+		HTTPProxy string `json:"http_proxy"`
+	} `json:"services"`
+}
+
+type Peer struct {
+	PublicKey string `json:"public_key"`
+	Endpoint  struct {
+		V4    string `json:"v4"`
+		V6    string `json:"v6"`
+		Host  string `json:"host"`
+		Ports []int  `json:"ports"`
+	} `json:"endpoint"`
+}
+
+type Policy struct {
+	TunnelProtocol string `json:"tunnel_protocol"`
+}
+
+type DeviceUpdate struct {
+	Key     string `json:"key"`
+	KeyType string `json:"key_type"`
+	TunType string `json:"tunnel_type"`
+	Name    string `json:"name,omitempty"`
+}
+
+type APIError struct {
+	Result   interface{} `json:"result"`
+	Success  bool        `json:"success"`
+	Errors   []ErrorInfo `json:"errors"`
+	Messages []string    `json:"messages"`
+}
+
+type ErrorInfo struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+func (e *APIError) Error() string {
+	errors := make([]string, len(e.Errors))
+	for i, err := range e.Errors {
+		errors[i] = err.Message
+	}
+	return strings.Join(errors, ",")
+}

common/cloudflare/option.go

@@ -0,0 +1,19 @@
+package cloudflare
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"time"
+)
+
+type CloudflareApiOption func(api *CloudflareApi)
+
+func WithDialContext(dialContext func(ctx context.Context, network, addr string) (net.Conn, error)) CloudflareApiOption {
+	return func(api *CloudflareApi) {
+		api.client.Timeout = 30 * time.Second
+		api.client.Transport = &http.Transport{
+			DialContext: dialContext,
+		}
+	}
+}

common/cloudflare/utils.go

@@ -0,0 +1,19 @@
+package cloudflare
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"time"
+)
+
+func GenerateRandomAndroidSerial() (string, error) {
+	serial := make([]byte, 8)
+	if _, err := rand.Read(serial); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(serial), nil
+}
+
+func TimeAsCfString(t time.Time) string {
+	return t.Format("2006-01-02T15:04:05.000-07:00")
+}

common/dialer/detour.go

@@ -52,14 +52,6 @@ func (d *DetourDialer) init() {
 		d.initErr = E.New("outbound detour not found: ", d.detour)
 		return
 	}
-	if !d.legacyDNSDialer {
-		if directDialer, isDirect := dialer.(DirectDialer); isDirect {
-			if directDialer.IsEmpty() {
-				d.initErr = E.New("detour to an empty direct outbound makes no sense")
-				return
-			}
-		}
-	}
 	d.dialer = dialer
 }
 

common/interrupt/conn.go

@@ -3,6 +3,7 @@ package interrupt
 import (
 	"net"
 
+	N "github.com/sagernet/sing/common/network"
 	"github.com/sagernet/sing/common/x/list"
 )
 
@@ -73,3 +74,32 @@ func (c *PacketConn) WriterReplaceable() bool {
 func (c *PacketConn) Upstream() any {
 	return c.PacketConn
 }
+
+type SingPacketConn struct {
+	N.PacketConn
+	group   *Group
+	element *list.Element[*groupConnItem]
+}
+
+/*func (c *SingPacketConn) MarkAsInternal() {
+	c.element.Value.internal = true
+}*/
+
+func (c *SingPacketConn) Close() error {
+	c.group.access.Lock()
+	defer c.group.access.Unlock()
+	c.group.connections.Remove(c.element)
+	return c.PacketConn.Close()
+}
+
+func (c *SingPacketConn) ReaderReplaceable() bool {
+	return true
+}
+
+func (c *SingPacketConn) WriterReplaceable() bool {
+	return true
+}
+
+func (c *SingPacketConn) Upstream() any {
+	return c.PacketConn
+}

common/interrupt/context.go

@@ -11,3 +11,13 @@ func ContextWithIsExternalConnection(ctx context.Context) context.Context {
 func IsExternalConnectionFromContext(ctx context.Context) bool {
 	return ctx.Value(contextKeyIsExternalConnection{}) != nil
 }
+
+type contextKeyIsProviderConnection struct{}
+
+func ContextWithIsProviderConnection(ctx context.Context) context.Context {
+	return context.WithValue(ctx, contextKeyIsProviderConnection{}, true)
+}
+
+func IsProviderConnectionFromContext(ctx context.Context) bool {
+	return ctx.Value(contextKeyIsProviderConnection{}) != nil
+}

common/interrupt/group.go

@@ -5,6 +5,7 @@ import (
 	"net"
 	"sync"
 
+	N "github.com/sagernet/sing/common/network"
 	"github.com/sagernet/sing/common/x/list"
 )
 
@@ -16,26 +17,34 @@ type Group struct {
 type groupConnItem struct {
 	conn       io.Closer
 	isExternal bool
+	isProvider bool
 }
 
 func NewGroup() *Group {
 	return &Group{}
 }
 
-func (g *Group) NewConn(conn net.Conn, isExternal bool) net.Conn {
+func (g *Group) NewConn(conn net.Conn, isExternal bool, isProvider bool) net.Conn {
 	g.access.Lock()
 	defer g.access.Unlock()
-	item := g.connections.PushBack(&groupConnItem{conn, isExternal})
+	item := g.connections.PushBack(&groupConnItem{conn, isExternal, isProvider})
 	return &Conn{Conn: conn, group: g, element: item}
 }
 
-func (g *Group) NewPacketConn(conn net.PacketConn, isExternal bool) net.PacketConn {
+func (g *Group) NewPacketConn(conn net.PacketConn, isExternal bool, isProvider bool) net.PacketConn {
 	g.access.Lock()
 	defer g.access.Unlock()
-	item := g.connections.PushBack(&groupConnItem{conn, isExternal})
+	item := g.connections.PushBack(&groupConnItem{conn, isExternal, isProvider})
 	return &PacketConn{PacketConn: conn, group: g, element: item}
 }
 
+func (g *Group) NewSingPacketConn(conn N.PacketConn, isExternal bool, isProvider bool) N.PacketConn {
+	g.access.Lock()
+	defer g.access.Unlock()
+	item := g.connections.PushBack(&groupConnItem{conn, isExternal, isProvider})
+	return &SingPacketConn{PacketConn: conn, group: g, element: item}
+}
+
 func (g *Group) Interrupt(interruptExternalConnections bool) {
 	g.access.Lock()
 	defer g.access.Unlock()

common/kmutex/mutex.go

@@ -0,0 +1,54 @@
+package kmutex
+
+import "sync"
+
+type Kmutex[T comparable] struct {
+	l sync.Locker
+	s map[T]*klock
+}
+
+type klock struct {
+	cond *sync.Cond
+	ref  uint64
+}
+
+func New[T comparable]() *Kmutex[T] {
+	l := sync.Mutex{}
+	return &Kmutex[T]{
+		l: &l,
+		s: make(map[T]*klock),
+	}
+}
+
+func (km *Kmutex[T]) Unlock(key T) {
+	km.l.Lock()
+	defer km.l.Unlock()
+	kl, ok := km.s[key]
+	if !ok || kl.ref == 0 {
+		panic("unlock of unlocked kmutex")
+	}
+	kl.ref--
+	if kl.ref == 0 {
+		delete(km.s, key)
+		return
+	}
+	kl.cond.Signal()
+}
+
+func (km *Kmutex[T]) Lock(key T) {
+	km.l.Lock()
+	defer km.l.Unlock()
+	for {
+		kl, ok := km.s[key]
+		if !ok {
+			km.s[key] = &klock{
+				cond: sync.NewCond(km.l),
+				ref:  1,
+			}
+			return
+		}
+		kl.ref++
+		kl.cond.Wait()
+		return
+	}
+}

common/kmutex/mutex_test.go

@@ -0,0 +1,96 @@
+package kmutex
+
+import (
+	"sync"
+	"testing"
+	"time"
+)
+
+// Number of unique resources to access
+const number = 100
+
+func makeIds(count int) []int {
+	ids := make([]int, count)
+	for i := 0; i < count; i++ {
+		ids[i] = i
+	}
+	return ids
+}
+
+func TestKmutex(t *testing.T) {
+	km := New[int]()
+	ids := makeIds(number)
+	resources := make([]int, number)
+	wg := sync.WaitGroup{}
+
+	lc := make(chan int)
+	uc := make(chan int)
+	// Start 10n goroutines accessing n resources 10 times each
+	for i := 0; i < 10*number; i++ {
+		wg.Add(1)
+		go func(k int) {
+			for j := 0; j < 10; j++ {
+				lc <- k
+				km.Lock(ids[k])
+				// read and write resource to check for race
+				resources[k] = resources[k] + 1
+				km.Unlock(ids[k])
+				uc <- k
+			}
+			wg.Done()
+		}(i % len(ids))
+	}
+
+	to := time.After(time.Second)
+	counts := make(map[int]int)
+	var lCount, ulCount int
+loop:
+	for {
+		select {
+		case k := <-lc:
+			counts[k] = counts[k] + 1
+			lCount++
+		case k := <-uc:
+			counts[k] = counts[k] - 1
+			ulCount++
+		case <-to:
+			t.Fatal("timed out waiting for results")
+			break loop
+		}
+		expectCount := 100 * number
+		if lCount == expectCount && ulCount == expectCount {
+			// Have all results
+			break
+		}
+	}
+	for k, c := range counts {
+		if c != 0 {
+			t.Errorf("Key %d count != 0: %d\n", k, c)
+		}
+	}
+
+	wg.Wait()
+}
+
+func BenchmarkKmutex1000(b *testing.B) {
+	km := New[int]()
+	ids := makeIds(number)
+	resources := make([]int, number)
+	wg := sync.WaitGroup{}
+
+	// Start 1000 goroutines accessing 100 resources N times each
+	b.ResetTimer()
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		go func(k int) {
+			for j := 0; j < b.N; j++ {
+				km.Lock(ids[k])
+				// read and write resource to check for race
+				resources[k] = resources[k] + 1
+				km.Unlock(ids[k])
+			}
+			wg.Done()
+		}(i % len(ids))
+	}
+	wg.Wait()
+}

common/migrate/source/raw.go

@@ -0,0 +1,98 @@
+package source
+
+import (
+	"io"
+	"io/fs"
+	"io/ioutil"
+	"strconv"
+	"strings"
+
+	"github.com/golang-migrate/migrate/v4/source"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+type RawDriver struct {
+	migrations    *source.Migrations
+	rawMigrations map[string]string
+}
+
+func NewRawDriver(rawMigrations map[string]string) *RawDriver {
+	return &RawDriver{rawMigrations: rawMigrations}
+}
+
+func (d *RawDriver) Init() error {
+	ms := source.NewMigrations()
+	for key := range d.rawMigrations {
+		m, err := source.DefaultParse(key)
+		if err != nil {
+			continue
+		}
+		if !ms.Append(m) {
+			return source.ErrDuplicateMigration{
+				Migration: *m,
+			}
+		}
+	}
+	d.migrations = ms
+	return nil
+}
+
+func (d *RawDriver) Open(url string) (source.Driver, error) {
+	return nil, E.New("open() cannot be called")
+}
+
+func (d *RawDriver) Close() error {
+	return nil
+}
+
+func (d *RawDriver) First() (version uint, err error) {
+	if version, ok := d.migrations.First(); ok {
+		return version, nil
+	}
+	return 0, &fs.PathError{
+		Op:  "first",
+		Err: fs.ErrNotExist,
+	}
+}
+
+func (d *RawDriver) Prev(version uint) (prevVersion uint, err error) {
+	if version, ok := d.migrations.Prev(version); ok {
+		return version, nil
+	}
+	return 0, &fs.PathError{
+		Op:  "prev for version " + strconv.FormatUint(uint64(version), 10),
+		Err: fs.ErrNotExist,
+	}
+}
+
+func (d *RawDriver) Next(version uint) (nextVersion uint, err error) {
+	if version, ok := d.migrations.Next(version); ok {
+		return version, nil
+	}
+	return 0, &fs.PathError{
+		Op:  "next for version " + strconv.FormatUint(uint64(version), 10),
+		Err: fs.ErrNotExist,
+	}
+}
+
+func (d *RawDriver) ReadUp(version uint) (r io.ReadCloser, identifier string, err error) {
+	if m, ok := d.migrations.Up(version); ok {
+		body := ioutil.NopCloser(strings.NewReader(d.rawMigrations[m.Raw]))
+		return body, m.Identifier, nil
+	}
+	return nil, "", &fs.PathError{
+		Op:  "read up for version " + strconv.FormatUint(uint64(version), 10),
+		Err: fs.ErrNotExist,
+	}
+}
+
+func (d *RawDriver) ReadDown(version uint) (r io.ReadCloser, identifier string, err error) {
+	if m, ok := d.migrations.Down(version); ok {
+		body := ioutil.NopCloser(strings.NewReader(d.rawMigrations[m.Raw]))
+		return body, m.Identifier, nil
+	}
+	return nil, "", &fs.PathError{
+		Op:  "read down for version " + strconv.FormatUint(uint64(version), 10),
+		Err: fs.ErrNotExist,
+	}
+}

common/mux/router.go

@@ -38,6 +38,9 @@ func NewRouterWithOptions(router adapter.ConnectionRouterEx, logger logger.Conte
 		}
 	}
 	service, err := mux.NewService(mux.ServiceOptions{
+		NewConnectionContext: func(ctx context.Context, conn net.Conn) context.Context {
+			return log.ContextWithNewMuxID(ctx)
+		},
 		NewStreamContext: func(ctx context.Context, conn net.Conn) context.Context {
 			return log.ContextWithNewID(ctx)
 		},

common/process/searcher_darwin_shared.go

@@ -261,7 +261,8 @@ func getExecPathFromPID(pid uint32) (string, error) {
 		procpidpathinfo,
 		0,
 		uintptr(unsafe.Pointer(&buf[0])),
-		procpidpathinfosize)
+		procpidpathinfosize,
+	)
 	if errno != 0 {
 		return "", errno
 	}

common/tls/masque_client.go

@@ -0,0 +1,74 @@
+package tls
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/tls"
+	"crypto/x509"
+	"time"
+
+	"github.com/sagernet/quic-go/http3"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+)
+
+func NewMASQUEClient(ctx context.Context, logger logger.ContextLogger, serverName string, cert [][]byte, privateKey *ecdsa.PrivateKey, peerPublicKey *ecdsa.PublicKey, options option.MASQUEOutboundTLSOptions) (Config, error) {
+	var tlsConfig tls.Config
+	tlsConfig.ServerName = serverName
+	tlsConfig.InsecureSkipVerify = true
+	tlsConfig.NextProtos = []string{http3.NextProtoH3}
+	tlsConfig.Certificates = []tls.Certificate{
+		{
+			Certificate: cert,
+			PrivateKey:  privateKey,
+		},
+	}
+	if options.CipherSuites != nil {
+	find:
+		for _, cipherSuite := range options.CipherSuites {
+			for _, tlsCipherSuite := range tls.CipherSuites() {
+				if cipherSuite == tlsCipherSuite.Name {
+					tlsConfig.CipherSuites = append(tlsConfig.CipherSuites, tlsCipherSuite.ID)
+					continue find
+				}
+			}
+			return nil, E.New("unknown cipher_suite: ", cipherSuite)
+		}
+	}
+	for _, curve := range options.CurvePreferences {
+		tlsConfig.CurvePreferences = append(tlsConfig.CurvePreferences, tls.CurveID(curve))
+	}
+	if !options.Insecure {
+		tlsConfig.VerifyPeerCertificate = func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+			if len(rawCerts) == 0 {
+				return nil
+			}
+			cert, err := x509.ParseCertificate(rawCerts[0])
+			if err != nil {
+				return err
+			}
+			if _, ok := cert.PublicKey.(*ecdsa.PublicKey); !ok {
+				return x509.ErrUnsupportedAlgorithm
+			}
+			if !cert.PublicKey.(*ecdsa.PublicKey).Equal(peerPublicKey) {
+				return x509.CertificateInvalidError{Cert: cert, Reason: 10, Detail: "remote endpoint has a different public key than what we trust in config.json"}
+			}
+			return nil
+		}
+	}
+	var config Config = &STDClientConfig{ctx, &tlsConfig, options.Fragment, time.Duration(options.FragmentFallbackDelay), options.RecordFragment}
+	if options.KernelRx || options.KernelTx {
+		if !C.IsLinux {
+			return nil, E.New("kTLS is only supported on Linux")
+		}
+		config = &KTLSClientConfig{
+			Config:   config,
+			logger:   logger,
+			kernelTx: options.KernelTx,
+			kernelRx: options.KernelRx,
+		}
+	}
+	return config, nil
+}

common/urltest/context.go

@@ -0,0 +1,13 @@
+package urltest
+
+import "context"
+
+type contextKeyIsUnifiedDelay struct{}
+
+func ContextWithIsUnifiedDelay(ctx context.Context) context.Context {
+	return context.WithValue(ctx, contextKeyIsUnifiedDelay{}, true)
+}
+
+func IsUnifiedDelayFromContext(ctx context.Context) bool {
+	return ctx.Value(contextKeyIsUnifiedDelay{}) != nil
+}

common/urltest/urltest.go

@@ -125,6 +125,15 @@ func URLTest(ctx context.Context, link string, detour N.Dialer) (t uint16, err e
 		return
 	}
 	resp.Body.Close()
+	if IsUnifiedDelayFromContext(ctx) {
+		second := time.Now()
+		resp, err = client.Do(req)
+		if err != nil {
+			return
+		}
+		resp.Body.Close()
+		start = second
+	}
 	t = uint16(time.Since(start) / time.Millisecond)
 	return
 }

common/utils.go

@@ -0,0 +1,79 @@
+package common
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+
+	Xbadoption "github.com/sagernet/sing-box/common/xray/json/badoption"
+	"github.com/sagernet/sing/common/json/badoption"
+)
+
+func StringToType[T any](str string) T {
+	var value T
+	v := reflect.ValueOf(&value).Elem()
+	switch any(value).(type) {
+	case badoption.Duration:
+		d, err := time.ParseDuration(str)
+		if err != nil {
+			v.SetInt(StringToType[int64](str))
+		} else {
+			v.Set(reflect.ValueOf(d))
+		}
+		return value
+	case badoption.HTTPHeader:
+		headers := badoption.HTTPHeader{}
+		reg := regexp.MustCompile(`^[ \t]*?(\S+?):[ \t]*?(\S+?)[ \t]*?$`)
+		for _, header := range strings.Split(str, "\n") {
+			result := reg.FindStringSubmatch(header)
+			if result != nil {
+				key := result[1]
+				headers[key] = strings.Split(result[2], ",")
+			}
+		}
+		v.Set(reflect.ValueOf(headers))
+		return value
+	}
+	switch v.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		i, _ := strconv.ParseInt(str, 10, 64)
+		v.SetInt(i)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		i, _ := strconv.ParseUint(str, 10, 64)
+		v.SetUint(i)
+	case reflect.Float32, reflect.Float64:
+		f, _ := strconv.ParseFloat(str, 64)
+		v.SetFloat(f)
+	case reflect.Bool:
+		b, _ := strconv.ParseBool(str)
+		v.SetBool(b)
+	default:
+		panic("unsupported type")
+	}
+	return value
+}
+
+func DecodeBase64URLSafe(content string) (string, error) {
+	s := strings.ReplaceAll(content, " ", "-")
+	s = strings.ReplaceAll(s, "/", "_")
+	s = strings.ReplaceAll(s, "+", "-")
+	s = strings.ReplaceAll(s, "=", "")
+	result, err := base64.RawURLEncoding.DecodeString(s)
+	if err != nil {
+		return content, nil
+	}
+	return string(result), nil
+}
+
+func ParseXHTTPRange(value string) (Xbadoption.Range, error) {
+	result := Xbadoption.Range{}
+	encoded, err := json.Marshal(value)
+	if err != nil {
+		return result, err
+	}
+	return result, result.UnmarshalJSON(encoded)
+}

common/vision/hook.go

@@ -0,0 +1,25 @@
+package vision
+
+import (
+	"context"
+	"net"
+)
+
+type Hook func(net.Conn)
+
+type hookKey struct{}
+
+func WithHook(ctx context.Context, hook Hook) context.Context {
+	if hook == nil {
+		return ctx
+	}
+	return context.WithValue(ctx, hookKey{}, hook)
+}
+
+func HookFromContext(ctx context.Context) (Hook, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	hook, ok := ctx.Value(hookKey{}).(Hook)
+	return hook, ok
+}

common/xray/buf/buffer.go

@@ -0,0 +1,348 @@
+package buf
+
+import (
+	"io"
+
+	"github.com/sagernet/sing-box/common/xray/bytespool"
+	"github.com/sagernet/sing-box/common/xray/net"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+const (
+	// Size of a regular buffer.
+	Size = 8192
+)
+
+var ErrBufferFull = E.New("buffer is full")
+
+var pool = bytespool.GetPool(Size)
+
+// ownership represents the data owner of the buffer.
+type ownership uint8
+
+const (
+	managed ownership = iota
+	unmanaged
+	bytespools
+)
+
+// Buffer is a recyclable allocation of a byte array. Buffer.Release() recycles
+// the buffer into an internal buffer pool, in order to recreate a buffer more
+// quickly.
+type Buffer struct {
+	v         []byte
+	start     int32
+	end       int32
+	ownership ownership
+	UDP       *net.Destination
+}
+
+// New creates a Buffer with 0 length and 8K capacity, managed.
+func New() *Buffer {
+	buf := pool.Get().([]byte)
+	if cap(buf) >= Size {
+		buf = buf[:Size]
+	} else {
+		buf = make([]byte, Size)
+	}
+
+	return &Buffer{
+		v: buf,
+	}
+}
+
+// NewExisted creates a standard size Buffer with an existed bytearray, managed.
+func NewExisted(b []byte) *Buffer {
+	if cap(b) < Size {
+		panic("Invalid buffer")
+	}
+
+	oLen := len(b)
+	if oLen < Size {
+		b = b[:Size]
+	}
+
+	return &Buffer{
+		v:   b,
+		end: int32(oLen),
+	}
+}
+
+// FromBytes creates a Buffer with an existed bytearray, unmanaged.
+func FromBytes(b []byte) *Buffer {
+	return &Buffer{
+		v:         b,
+		end:       int32(len(b)),
+		ownership: unmanaged,
+	}
+}
+
+// StackNew creates a new Buffer object on stack, managed.
+// This method is for buffers that is released in the same function.
+func StackNew() Buffer {
+	buf := pool.Get().([]byte)
+	if cap(buf) >= Size {
+		buf = buf[:Size]
+	} else {
+		buf = make([]byte, Size)
+	}
+
+	return Buffer{
+		v: buf,
+	}
+}
+
+// NewWithSize creates a Buffer with 0 length and capacity with at least the given size, bytespool's.
+func NewWithSize(size int32) *Buffer {
+	return &Buffer{
+		v:         bytespool.Alloc(size),
+		ownership: bytespools,
+	}
+}
+
+// Release recycles the buffer into an internal buffer pool.
+func (b *Buffer) Release() {
+	if b == nil || b.v == nil || b.ownership == unmanaged {
+		return
+	}
+
+	p := b.v
+	b.v = nil
+	b.Clear()
+
+	switch b.ownership {
+	case managed:
+		if cap(p) == Size {
+			pool.Put(p)
+		}
+	case bytespools:
+		bytespool.Free(p)
+	}
+	b.UDP = nil
+}
+
+// Clear clears the content of the buffer, results an empty buffer with
+// Len() = 0.
+func (b *Buffer) Clear() {
+	b.start = 0
+	b.end = 0
+}
+
+// Byte returns the bytes at index.
+func (b *Buffer) Byte(index int32) byte {
+	return b.v[b.start+index]
+}
+
+// SetByte sets the byte value at index.
+func (b *Buffer) SetByte(index int32, value byte) {
+	b.v[b.start+index] = value
+}
+
+// Bytes returns the content bytes of this Buffer.
+func (b *Buffer) Bytes() []byte {
+	return b.v[b.start:b.end]
+}
+
+// Extend increases the buffer size by n bytes, and returns the extended part.
+// It panics if result size is larger than size of this buffer.
+func (b *Buffer) Extend(n int32) []byte {
+	end := b.end + n
+	if end > int32(len(b.v)) {
+		panic("extending out of bound")
+	}
+	ext := b.v[b.end:end]
+	b.end = end
+	clear(ext)
+	return ext
+}
+
+// BytesRange returns a slice of this buffer with given from and to boundary.
+func (b *Buffer) BytesRange(from, to int32) []byte {
+	if from < 0 {
+		from += b.Len()
+	}
+	if to < 0 {
+		to += b.Len()
+	}
+	return b.v[b.start+from : b.start+to]
+}
+
+// BytesFrom returns a slice of this Buffer starting from the given position.
+func (b *Buffer) BytesFrom(from int32) []byte {
+	if from < 0 {
+		from += b.Len()
+	}
+	return b.v[b.start+from : b.end]
+}
+
+// BytesTo returns a slice of this Buffer from start to the given position.
+func (b *Buffer) BytesTo(to int32) []byte {
+	if to < 0 {
+		to += b.Len()
+	}
+	if to < 0 {
+		to = 0
+	}
+	return b.v[b.start : b.start+to]
+}
+
+// Check makes sure that 0 <= b.start <= b.end.
+func (b *Buffer) Check() {
+	if b.start < 0 {
+		b.start = 0
+	}
+	if b.end < 0 {
+		b.end = 0
+	}
+	if b.start > b.end {
+		b.start = b.end
+	}
+}
+
+// Resize cuts the buffer at the given position.
+func (b *Buffer) Resize(from, to int32) {
+	oldEnd := b.end
+	if from < 0 {
+		from += b.Len()
+	}
+	if to < 0 {
+		to += b.Len()
+	}
+	if to < from {
+		panic("Invalid slice")
+	}
+	b.end = b.start + to
+	b.start += from
+	b.Check()
+	if b.end > oldEnd {
+		clear(b.v[oldEnd:b.end])
+	}
+}
+
+// Advance cuts the buffer at the given position.
+func (b *Buffer) Advance(from int32) {
+	if from < 0 {
+		from += b.Len()
+	}
+	b.start += from
+	b.Check()
+}
+
+// Len returns the length of the buffer content.
+func (b *Buffer) Len() int32 {
+	if b == nil {
+		return 0
+	}
+	return b.end - b.start
+}
+
+// Cap returns the capacity of the buffer content.
+func (b *Buffer) Cap() int32 {
+	if b == nil {
+		return 0
+	}
+	return int32(len(b.v))
+}
+
+// Available returns the available capacity of the buffer content.
+func (b *Buffer) Available() int32 {
+	if b == nil {
+		return 0
+	}
+	return int32(len(b.v)) - b.end
+}
+
+// IsEmpty returns true if the buffer is empty.
+func (b *Buffer) IsEmpty() bool {
+	return b.Len() == 0
+}
+
+// IsFull returns true if the buffer has no more room to grow.
+func (b *Buffer) IsFull() bool {
+	return b != nil && b.end == int32(len(b.v))
+}
+
+// Write implements Write method in io.Writer.
+func (b *Buffer) Write(data []byte) (int, error) {
+	nBytes := copy(b.v[b.end:], data)
+	b.end += int32(nBytes)
+	if nBytes < len(data) {
+		return nBytes, ErrBufferFull
+	}
+	return nBytes, nil
+}
+
+// WriteByte writes a single byte into the buffer.
+func (b *Buffer) WriteByte(v byte) error {
+	if b.IsFull() {
+		return ErrBufferFull
+	}
+	b.v[b.end] = v
+	b.end++
+	return nil
+}
+
+// WriteString implements io.StringWriter.
+func (b *Buffer) WriteString(s string) (int, error) {
+	return b.Write([]byte(s))
+}
+
+// ReadByte implements io.ByteReader
+func (b *Buffer) ReadByte() (byte, error) {
+	if b.start == b.end {
+		return 0, io.EOF
+	}
+
+	nb := b.v[b.start]
+	b.start++
+	return nb, nil
+}
+
+// ReadBytes implements bufio.Reader.ReadBytes
+func (b *Buffer) ReadBytes(length int32) ([]byte, error) {
+	if b.end-b.start < length {
+		return nil, io.EOF
+	}
+
+	nb := b.v[b.start : b.start+length]
+	b.start += length
+	return nb, nil
+}
+
+// Read implements io.Reader.Read().
+func (b *Buffer) Read(data []byte) (int, error) {
+	if b.Len() == 0 {
+		return 0, io.EOF
+	}
+	nBytes := copy(data, b.v[b.start:b.end])
+	if int32(nBytes) == b.Len() {
+		b.Clear()
+	} else {
+		b.start += int32(nBytes)
+	}
+	return nBytes, nil
+}
+
+// ReadFrom implements io.ReaderFrom.
+func (b *Buffer) ReadFrom(reader io.Reader) (int64, error) {
+	n, err := reader.Read(b.v[b.end:])
+	b.end += int32(n)
+	return int64(n), err
+}
+
+// ReadFullFrom reads exact size of bytes from given reader, or until error occurs.
+func (b *Buffer) ReadFullFrom(reader io.Reader, size int32) (int64, error) {
+	end := b.end + size
+	if end > int32(len(b.v)) {
+		v := end
+		return 0, E.New("out of bound: ", v)
+	}
+	n, err := io.ReadFull(reader, b.v[b.end:end])
+	b.end += int32(n)
+	return int64(n), err
+}
+
+// String returns the string form of this Buffer.
+func (b *Buffer) String() string {
+	return string(b.Bytes())
+}

common/xray/buf/copy.go

@@ -0,0 +1,124 @@
+package buf
+
+import (
+	"io"
+	"time"
+
+	"github.com/sagernet/sing-box/common/xray/errors"
+	"github.com/sagernet/sing-box/common/xray/signal"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+type dataHandler func(MultiBuffer)
+
+type copyHandler struct {
+	onData []dataHandler
+}
+
+// SizeCounter is for counting bytes copied by Copy().
+type SizeCounter struct {
+	Size int64
+}
+
+// CopyOption is an option for copying data.
+type CopyOption func(*copyHandler)
+
+// UpdateActivity is a CopyOption to update activity on each data copy operation.
+func UpdateActivity(timer signal.ActivityUpdater) CopyOption {
+	return func(handler *copyHandler) {
+		handler.onData = append(handler.onData, func(MultiBuffer) {
+			timer.Update()
+		})
+	}
+}
+
+// CountSize is a CopyOption that sums the total size of data copied into the given SizeCounter.
+func CountSize(sc *SizeCounter) CopyOption {
+	return func(handler *copyHandler) {
+		handler.onData = append(handler.onData, func(b MultiBuffer) {
+			sc.Size += int64(b.Len())
+		})
+	}
+}
+
+type readError struct {
+	error
+}
+
+func (e readError) Error() string {
+	return e.error.Error()
+}
+
+func (e readError) Unwrap() error {
+	return e.error
+}
+
+// IsReadError returns true if the error in Copy() comes from reading.
+func IsReadError(err error) bool {
+	_, ok := err.(readError)
+	return ok
+}
+
+type writeError struct {
+	error
+}
+
+func (e writeError) Error() string {
+	return e.error.Error()
+}
+
+func (e writeError) Unwrap() error {
+	return e.error
+}
+
+// IsWriteError returns true if the error in Copy() comes from writing.
+func IsWriteError(err error) bool {
+	_, ok := err.(writeError)
+	return ok
+}
+
+func copyInternal(reader Reader, writer Writer, handler *copyHandler) error {
+	for {
+		buffer, err := reader.ReadMultiBuffer()
+		if !buffer.IsEmpty() {
+			for _, handler := range handler.onData {
+				handler(buffer)
+			}
+
+			if werr := writer.WriteMultiBuffer(buffer); werr != nil {
+				return writeError{werr}
+			}
+		}
+
+		if err != nil {
+			return readError{err}
+		}
+	}
+}
+
+// Copy dumps all payload from reader to writer or stops when an error occurs. It returns nil when EOF.
+func Copy(reader Reader, writer Writer, options ...CopyOption) error {
+	var handler copyHandler
+	for _, option := range options {
+		option(&handler)
+	}
+	err := copyInternal(reader, writer, &handler)
+	if err != nil && errors.Cause(err) != io.EOF {
+		return err
+	}
+	return nil
+}
+
+var ErrNotTimeoutReader = E.New("not a TimeoutReader")
+
+func CopyOnceTimeout(reader Reader, writer Writer, timeout time.Duration) error {
+	timeoutReader, ok := reader.(TimeoutReader)
+	if !ok {
+		return ErrNotTimeoutReader
+	}
+	mb, err := timeoutReader.ReadMultiBufferTimeout(timeout)
+	if err != nil {
+		return err
+	}
+	return writer.WriteMultiBuffer(mb)
+}

common/xray/buf/io.go

@@ -0,0 +1,127 @@
+package buf
+
+import (
+	"io"
+	"net"
+	"syscall"
+	"time"
+
+	"github.com/sagernet/sing-box/common/xray/stat"
+	"github.com/sagernet/sing-box/common/xray/stats"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+// Reader extends io.Reader with MultiBuffer.
+type Reader interface {
+	// ReadMultiBuffer reads content from underlying reader, and put it into a MultiBuffer.
+	ReadMultiBuffer() (MultiBuffer, error)
+}
+
+// ErrReadTimeout is an error that happens with IO timeout.
+var ErrReadTimeout = E.New("IO timeout")
+
+// TimeoutReader is a reader that returns error if Read() operation takes longer than the given timeout.
+type TimeoutReader interface {
+	Reader
+	ReadMultiBufferTimeout(time.Duration) (MultiBuffer, error)
+}
+
+// Writer extends io.Writer with MultiBuffer.
+type Writer interface {
+	// WriteMultiBuffer writes a MultiBuffer into underlying writer.
+	WriteMultiBuffer(MultiBuffer) error
+}
+
+// WriteAllBytes ensures all bytes are written into the given writer.
+func WriteAllBytes(writer io.Writer, payload []byte, c stats.Counter) error {
+	wc := 0
+	defer func() {
+		if c != nil {
+			c.Add(int64(wc))
+		}
+	}()
+
+	for len(payload) > 0 {
+		n, err := writer.Write(payload)
+		wc += n
+		if err != nil {
+			return err
+		}
+		payload = payload[n:]
+	}
+	return nil
+}
+
+func isPacketReader(reader io.Reader) bool {
+	_, ok := reader.(net.PacketConn)
+	return ok
+}
+
+// NewReader creates a new Reader.
+// The Reader instance doesn't take the ownership of reader.
+func NewReader(reader io.Reader) Reader {
+	if mr, ok := reader.(Reader); ok {
+		return mr
+	}
+
+	if isPacketReader(reader) {
+		return &PacketReader{
+			Reader: reader,
+		}
+	}
+
+	return &SingleReader{
+		Reader: reader,
+	}
+}
+
+// NewPacketReader creates a new PacketReader based on the given reader.
+func NewPacketReader(reader io.Reader) Reader {
+	if mr, ok := reader.(Reader); ok {
+		return mr
+	}
+
+	return &PacketReader{
+		Reader: reader,
+	}
+}
+
+func isPacketWriter(writer io.Writer) bool {
+	if _, ok := writer.(net.PacketConn); ok {
+		return true
+	}
+
+	// If the writer doesn't implement syscall.Conn, it is probably not a TCP connection.
+	if _, ok := writer.(syscall.Conn); !ok {
+		return true
+	}
+	return false
+}
+
+// NewWriter creates a new Writer.
+func NewWriter(writer io.Writer) Writer {
+	if mw, ok := writer.(Writer); ok {
+		return mw
+	}
+
+	iConn := writer
+	if statConn, ok := writer.(*stat.CounterConnection); ok {
+		iConn = statConn.Connection
+	}
+
+	if isPacketWriter(iConn) {
+		return &SequentialWriter{
+			Writer: writer,
+		}
+	}
+
+	var counter stats.Counter
+
+	if statConn, ok := writer.(*stat.CounterConnection); ok {
+		counter = statConn.WriteCounter
+	}
+	return &BufferToBytesWriter{
+		Writer:  iConn,
+		counter: counter,
+	}
+}

common/xray/buf/multi_buffer.go

@@ -0,0 +1,310 @@
+package buf
+
+import (
+	"io"
+
+	"github.com/sagernet/sing-box/common/xray"
+	"github.com/sagernet/sing-box/common/xray/errors"
+	"github.com/sagernet/sing-box/common/xray/serial"
+)
+
+// ReadAllToBytes reads all content from the reader into a byte array, until EOF.
+func ReadAllToBytes(reader io.Reader) ([]byte, error) {
+	mb, err := ReadFrom(reader)
+	if err != nil {
+		return nil, err
+	}
+	if mb.Len() == 0 {
+		return nil, nil
+	}
+	b := make([]byte, mb.Len())
+	mb, _ = SplitBytes(mb, b)
+	ReleaseMulti(mb)
+	return b, nil
+}
+
+// MultiBuffer is a list of Buffers. The order of Buffer matters.
+type MultiBuffer []*Buffer
+
+// MergeMulti merges content from src to dest, and returns the new address of dest and src
+func MergeMulti(dest MultiBuffer, src MultiBuffer) (MultiBuffer, MultiBuffer) {
+	dest = append(dest, src...)
+	for idx := range src {
+		src[idx] = nil
+	}
+	return dest, src[:0]
+}
+
+// MergeBytes merges the given bytes into MultiBuffer and return the new address of the merged MultiBuffer.
+func MergeBytes(dest MultiBuffer, src []byte) MultiBuffer {
+	n := len(dest)
+	if n > 0 && !dest[n-1].IsFull() {
+		nBytes, _ := dest[n-1].Write(src)
+		src = src[nBytes:]
+	}
+
+	for len(src) > 0 {
+		b := New()
+		nBytes, _ := b.Write(src)
+		src = src[nBytes:]
+		dest = append(dest, b)
+	}
+
+	return dest
+}
+
+// ReleaseMulti releases all content of the MultiBuffer, and returns an empty MultiBuffer.
+func ReleaseMulti(mb MultiBuffer) MultiBuffer {
+	for i := range mb {
+		mb[i].Release()
+		mb[i] = nil
+	}
+	return mb[:0]
+}
+
+// Copy copied the beginning part of the MultiBuffer into the given byte array.
+func (mb MultiBuffer) Copy(b []byte) int {
+	total := 0
+	for _, bb := range mb {
+		nBytes := copy(b[total:], bb.Bytes())
+		total += nBytes
+		if int32(nBytes) < bb.Len() {
+			break
+		}
+	}
+	return total
+}
+
+// ReadFrom reads all content from reader until EOF.
+func ReadFrom(reader io.Reader) (MultiBuffer, error) {
+	mb := make(MultiBuffer, 0, 16)
+	for {
+		b := New()
+		_, err := b.ReadFullFrom(reader, Size)
+		if b.IsEmpty() {
+			b.Release()
+		} else {
+			mb = append(mb, b)
+		}
+		if err != nil {
+			if errors.Cause(err) == io.EOF || errors.Cause(err) == io.ErrUnexpectedEOF {
+				return mb, nil
+			}
+			return mb, err
+		}
+	}
+}
+
+// SplitBytes splits the given amount of bytes from the beginning of the MultiBuffer.
+// It returns the new address of MultiBuffer leftover, and number of bytes written into the input byte slice.
+func SplitBytes(mb MultiBuffer, b []byte) (MultiBuffer, int) {
+	totalBytes := 0
+	endIndex := -1
+	for i := range mb {
+		pBuffer := mb[i]
+		nBytes, _ := pBuffer.Read(b)
+		totalBytes += nBytes
+		b = b[nBytes:]
+		if !pBuffer.IsEmpty() {
+			endIndex = i
+			break
+		}
+		pBuffer.Release()
+		mb[i] = nil
+	}
+
+	if endIndex == -1 {
+		mb = mb[:0]
+	} else {
+		mb = mb[endIndex:]
+	}
+
+	return mb, totalBytes
+}
+
+// SplitFirstBytes splits the first buffer from MultiBuffer, and then copy its content into the given slice.
+func SplitFirstBytes(mb MultiBuffer, p []byte) (MultiBuffer, int) {
+	mb, b := SplitFirst(mb)
+	if b == nil {
+		return mb, 0
+	}
+	n := copy(p, b.Bytes())
+	b.Release()
+	return mb, n
+}
+
+// Compact returns another MultiBuffer by merging all content of the given one together.
+func Compact(mb MultiBuffer) MultiBuffer {
+	if len(mb) == 0 {
+		return mb
+	}
+
+	mb2 := make(MultiBuffer, 0, len(mb))
+	last := mb[0]
+
+	for i := 1; i < len(mb); i++ {
+		curr := mb[i]
+		if curr.Len() > last.Available() {
+			mb2 = append(mb2, last)
+			last = curr
+		} else {
+			common.Must2(last.ReadFrom(curr))
+			curr.Release()
+		}
+	}
+
+	mb2 = append(mb2, last)
+	return mb2
+}
+
+// SplitFirst splits the first Buffer from the beginning of the MultiBuffer.
+func SplitFirst(mb MultiBuffer) (MultiBuffer, *Buffer) {
+	if len(mb) == 0 {
+		return mb, nil
+	}
+
+	b := mb[0]
+	mb[0] = nil
+	mb = mb[1:]
+	return mb, b
+}
+
+// SplitSize splits the beginning of the MultiBuffer into another one, for at most size bytes.
+func SplitSize(mb MultiBuffer, size int32) (MultiBuffer, MultiBuffer) {
+	if len(mb) == 0 {
+		return mb, nil
+	}
+
+	if mb[0].Len() > size {
+		b := New()
+		copy(b.Extend(size), mb[0].BytesTo(size))
+		mb[0].Advance(size)
+		return mb, MultiBuffer{b}
+	}
+
+	totalBytes := int32(0)
+	var r MultiBuffer
+	endIndex := -1
+	for i := range mb {
+		if totalBytes+mb[i].Len() > size {
+			endIndex = i
+			break
+		}
+		totalBytes += mb[i].Len()
+		r = append(r, mb[i])
+		mb[i] = nil
+	}
+	if endIndex == -1 {
+		// To reuse mb array
+		mb = mb[:0]
+	} else {
+		mb = mb[endIndex:]
+	}
+	return mb, r
+}
+
+// SplitMulti splits the beginning of the MultiBuffer into first one, the index i and after into second one
+func SplitMulti(mb MultiBuffer, i int) (MultiBuffer, MultiBuffer) {
+	mb2 := make(MultiBuffer, 0, len(mb))
+	if i < len(mb) && i >= 0 {
+		mb2 = append(mb2, mb[i:]...)
+		for j := i; j < len(mb); j++ {
+			mb[j] = nil
+		}
+		mb = mb[:i]
+	}
+	return mb, mb2
+}
+
+// WriteMultiBuffer writes all buffers from the MultiBuffer to the Writer one by one, and return error if any, with leftover MultiBuffer.
+func WriteMultiBuffer(writer io.Writer, mb MultiBuffer) (MultiBuffer, error) {
+	for {
+		mb2, b := SplitFirst(mb)
+		mb = mb2
+		if b == nil {
+			break
+		}
+
+		_, err := writer.Write(b.Bytes())
+		b.Release()
+		if err != nil {
+			return mb, err
+		}
+	}
+
+	return nil, nil
+}
+
+// Len returns the total number of bytes in the MultiBuffer.
+func (mb MultiBuffer) Len() int32 {
+	if mb == nil {
+		return 0
+	}
+
+	size := int32(0)
+	for _, b := range mb {
+		size += b.Len()
+	}
+	return size
+}
+
+// IsEmpty returns true if the MultiBuffer has no content.
+func (mb MultiBuffer) IsEmpty() bool {
+	for _, b := range mb {
+		if !b.IsEmpty() {
+			return false
+		}
+	}
+	return true
+}
+
+// String returns the content of the MultiBuffer in string.
+func (mb MultiBuffer) String() string {
+	v := make([]interface{}, len(mb))
+	for i, b := range mb {
+		v[i] = b
+	}
+	return serial.Concat(v...)
+}
+
+// MultiBufferContainer is a ReadWriteCloser wrapper over MultiBuffer.
+type MultiBufferContainer struct {
+	MultiBuffer
+}
+
+// Read implements io.Reader.
+func (c *MultiBufferContainer) Read(b []byte) (int, error) {
+	if c.MultiBuffer.IsEmpty() {
+		return 0, io.EOF
+	}
+
+	mb, nBytes := SplitBytes(c.MultiBuffer, b)
+	c.MultiBuffer = mb
+	return nBytes, nil
+}
+
+// ReadMultiBuffer implements Reader.
+func (c *MultiBufferContainer) ReadMultiBuffer() (MultiBuffer, error) {
+	mb := c.MultiBuffer
+	c.MultiBuffer = nil
+	return mb, nil
+}
+
+// Write implements io.Writer.
+func (c *MultiBufferContainer) Write(b []byte) (int, error) {
+	c.MultiBuffer = MergeBytes(c.MultiBuffer, b)
+	return len(b), nil
+}
+
+// WriteMultiBuffer implements Writer.
+func (c *MultiBufferContainer) WriteMultiBuffer(b MultiBuffer) error {
+	mb, _ := MergeMulti(c.MultiBuffer, b)
+	c.MultiBuffer = mb
+	return nil
+}
+
+// Close implements io.Closer.
+func (c *MultiBufferContainer) Close() error {
+	c.MultiBuffer = ReleaseMulti(c.MultiBuffer)
+	return nil
+}

common/xray/buf/override.go

@@ -0,0 +1,38 @@
+package buf
+
+import (
+	"github.com/sagernet/sing-box/common/xray/net"
+)
+
+type EndpointOverrideReader struct {
+	Reader
+	Dest         net.Address
+	OriginalDest net.Address
+}
+
+func (r *EndpointOverrideReader) ReadMultiBuffer() (MultiBuffer, error) {
+	mb, err := r.Reader.ReadMultiBuffer()
+	if err == nil {
+		for _, b := range mb {
+			if b.UDP != nil && b.UDP.Address == r.OriginalDest {
+				b.UDP.Address = r.Dest
+			}
+		}
+	}
+	return mb, err
+}
+
+type EndpointOverrideWriter struct {
+	Writer
+	Dest         net.Address
+	OriginalDest net.Address
+}
+
+func (w *EndpointOverrideWriter) WriteMultiBuffer(mb MultiBuffer) error {
+	for _, b := range mb {
+		if b.UDP != nil && b.UDP.Address == w.Dest {
+			b.UDP.Address = w.OriginalDest
+		}
+	}
+	return w.Writer.WriteMultiBuffer(mb)
+}

common/xray/buf/reader.go

@@ -0,0 +1,175 @@
+package buf
+
+import (
+	"io"
+
+	"github.com/sagernet/sing-box/common/xray"
+	"github.com/sagernet/sing-box/common/xray/errors"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+func readOneUDP(r io.Reader) (*Buffer, error) {
+	b := New()
+	for i := 0; i < 64; i++ {
+		_, err := b.ReadFrom(r)
+		if !b.IsEmpty() {
+			return b, nil
+		}
+		if err != nil {
+			b.Release()
+			return nil, err
+		}
+	}
+
+	b.Release()
+	return nil, E.New("Reader returns too many empty payloads.")
+}
+
+// ReadBuffer reads a Buffer from the given reader.
+func ReadBuffer(r io.Reader) (*Buffer, error) {
+	b := New()
+	n, err := b.ReadFrom(r)
+	if n > 0 {
+		return b, err
+	}
+	b.Release()
+	return nil, err
+}
+
+// BufferedReader is a Reader that keeps its internal buffer.
+type BufferedReader struct {
+	// Reader is the underlying reader to be read from
+	Reader Reader
+	// Buffer is the internal buffer to be read from first
+	Buffer MultiBuffer
+	// Splitter is a function to read bytes from MultiBuffer
+	Splitter func(MultiBuffer, []byte) (MultiBuffer, int)
+}
+
+// BufferedBytes returns the number of bytes that is cached in this reader.
+func (r *BufferedReader) BufferedBytes() int32 {
+	return r.Buffer.Len()
+}
+
+// ReadByte implements io.ByteReader.
+func (r *BufferedReader) ReadByte() (byte, error) {
+	var b [1]byte
+	_, err := r.Read(b[:])
+	return b[0], err
+}
+
+// Read implements io.Reader. It reads from internal buffer first (if available) and then reads from the underlying reader.
+func (r *BufferedReader) Read(b []byte) (int, error) {
+	spliter := r.Splitter
+	if spliter == nil {
+		spliter = SplitBytes
+	}
+
+	if !r.Buffer.IsEmpty() {
+		buffer, nBytes := spliter(r.Buffer, b)
+		r.Buffer = buffer
+		if r.Buffer.IsEmpty() {
+			r.Buffer = nil
+		}
+		return nBytes, nil
+	}
+
+	mb, err := r.Reader.ReadMultiBuffer()
+	if err != nil {
+		return 0, err
+	}
+
+	mb, nBytes := spliter(mb, b)
+	if !mb.IsEmpty() {
+		r.Buffer = mb
+	}
+	return nBytes, nil
+}
+
+// ReadMultiBuffer implements Reader.
+func (r *BufferedReader) ReadMultiBuffer() (MultiBuffer, error) {
+	if !r.Buffer.IsEmpty() {
+		mb := r.Buffer
+		r.Buffer = nil
+		return mb, nil
+	}
+
+	return r.Reader.ReadMultiBuffer()
+}
+
+// ReadAtMost returns a MultiBuffer with at most size.
+func (r *BufferedReader) ReadAtMost(size int32) (MultiBuffer, error) {
+	if r.Buffer.IsEmpty() {
+		mb, err := r.Reader.ReadMultiBuffer()
+		if mb.IsEmpty() && err != nil {
+			return nil, err
+		}
+		r.Buffer = mb
+	}
+
+	rb, mb := SplitSize(r.Buffer, size)
+	r.Buffer = rb
+	if r.Buffer.IsEmpty() {
+		r.Buffer = nil
+	}
+	return mb, nil
+}
+
+func (r *BufferedReader) writeToInternal(writer io.Writer) (int64, error) {
+	mbWriter := NewWriter(writer)
+	var sc SizeCounter
+	if r.Buffer != nil {
+		sc.Size = int64(r.Buffer.Len())
+		if err := mbWriter.WriteMultiBuffer(r.Buffer); err != nil {
+			return 0, err
+		}
+		r.Buffer = nil
+	}
+
+	err := Copy(r.Reader, mbWriter, CountSize(&sc))
+	return sc.Size, err
+}
+
+// WriteTo implements io.WriterTo.
+func (r *BufferedReader) WriteTo(writer io.Writer) (int64, error) {
+	nBytes, err := r.writeToInternal(writer)
+	if errors.Cause(err) == io.EOF {
+		return nBytes, nil
+	}
+	return nBytes, err
+}
+
+// Interrupt implements common.Interruptible.
+func (r *BufferedReader) Interrupt() {
+	common.Interrupt(r.Reader)
+}
+
+// Close implements io.Closer.
+func (r *BufferedReader) Close() error {
+	return common.Close(r.Reader)
+}
+
+// SingleReader is a Reader that read one Buffer every time.
+type SingleReader struct {
+	io.Reader
+}
+
+// ReadMultiBuffer implements Reader.
+func (r *SingleReader) ReadMultiBuffer() (MultiBuffer, error) {
+	b, err := ReadBuffer(r.Reader)
+	return MultiBuffer{b}, err
+}
+
+// PacketReader is a Reader that read one Buffer every time.
+type PacketReader struct {
+	io.Reader
+}
+
+// ReadMultiBuffer implements Reader.
+func (r *PacketReader) ReadMultiBuffer() (MultiBuffer, error) {
+	b, err := readOneUDP(r.Reader)
+	if err != nil {
+		return nil, err
+	}
+	return MultiBuffer{b}, nil
+}

common/xray/buf/writer.go

@@ -0,0 +1,284 @@
+package buf
+
+import (
+	"io"
+	"net"
+	"sync"
+
+	"github.com/sagernet/sing-box/common/xray"
+	"github.com/sagernet/sing-box/common/xray/errors"
+	"github.com/sagernet/sing-box/common/xray/stats"
+)
+
+// BufferToBytesWriter is a Writer that writes alloc.Buffer into underlying writer.
+type BufferToBytesWriter struct {
+	io.Writer
+
+	counter stats.Counter
+	cache   [][]byte
+}
+
+// WriteMultiBuffer implements Writer. This method takes ownership of the given buffer.
+func (w *BufferToBytesWriter) WriteMultiBuffer(mb MultiBuffer) error {
+	defer ReleaseMulti(mb)
+
+	size := mb.Len()
+	if size == 0 {
+		return nil
+	}
+
+	if len(mb) == 1 {
+		return WriteAllBytes(w.Writer, mb[0].Bytes(), w.counter)
+	}
+
+	if cap(w.cache) < len(mb) {
+		w.cache = make([][]byte, 0, len(mb))
+	}
+
+	bs := w.cache
+	for _, b := range mb {
+		bs = append(bs, b.Bytes())
+	}
+
+	defer func() {
+		for idx := range bs {
+			bs[idx] = nil
+		}
+	}()
+
+	nb := net.Buffers(bs)
+	wc := int64(0)
+	defer func() {
+		if w.counter != nil {
+			w.counter.Add(wc)
+		}
+	}()
+	for size > 0 {
+		n, err := nb.WriteTo(w.Writer)
+		wc += n
+		if err != nil {
+			return err
+		}
+		size -= int32(n)
+	}
+
+	return nil
+}
+
+// ReadFrom implements io.ReaderFrom.
+func (w *BufferToBytesWriter) ReadFrom(reader io.Reader) (int64, error) {
+	var sc SizeCounter
+	err := Copy(NewReader(reader), w, CountSize(&sc))
+	return sc.Size, err
+}
+
+// BufferedWriter is a Writer with internal buffer.
+type BufferedWriter struct {
+	sync.Mutex
+	writer    Writer
+	buffer    *Buffer
+	buffered  bool
+	flushNext bool
+}
+
+// NewBufferedWriter creates a new BufferedWriter.
+func NewBufferedWriter(writer Writer) *BufferedWriter {
+	return &BufferedWriter{
+		writer:   writer,
+		buffer:   New(),
+		buffered: true,
+	}
+}
+
+// WriteByte implements io.ByteWriter.
+func (w *BufferedWriter) WriteByte(c byte) error {
+	return common.Error2(w.Write([]byte{c}))
+}
+
+// Write implements io.Writer.
+func (w *BufferedWriter) Write(b []byte) (int, error) {
+	if len(b) == 0 {
+		return 0, nil
+	}
+
+	w.Lock()
+	defer w.Unlock()
+
+	if !w.buffered {
+		if writer, ok := w.writer.(io.Writer); ok {
+			return writer.Write(b)
+		}
+	}
+
+	totalBytes := 0
+	for len(b) > 0 {
+		if w.buffer == nil {
+			w.buffer = New()
+		}
+
+		nBytes, err := w.buffer.Write(b)
+		totalBytes += nBytes
+		if err != nil {
+			return totalBytes, err
+		}
+		if !w.buffered || w.buffer.IsFull() {
+			if err := w.flushInternal(); err != nil {
+				return totalBytes, err
+			}
+		}
+		b = b[nBytes:]
+	}
+
+	return totalBytes, nil
+}
+
+// WriteMultiBuffer implements Writer. It takes ownership of the given MultiBuffer.
+func (w *BufferedWriter) WriteMultiBuffer(b MultiBuffer) error {
+	if b.IsEmpty() {
+		return nil
+	}
+
+	w.Lock()
+	defer w.Unlock()
+
+	if !w.buffered {
+		return w.writer.WriteMultiBuffer(b)
+	}
+
+	reader := MultiBufferContainer{
+		MultiBuffer: b,
+	}
+	defer reader.Close()
+
+	for !reader.MultiBuffer.IsEmpty() {
+		if w.buffer == nil {
+			w.buffer = New()
+		}
+		common.Must2(w.buffer.ReadFrom(&reader))
+		if w.buffer.IsFull() {
+			if err := w.flushInternal(); err != nil {
+				return err
+			}
+		}
+	}
+
+	if w.flushNext {
+		w.buffered = false
+		w.flushNext = false
+		return w.flushInternal()
+	}
+
+	return nil
+}
+
+// Flush flushes buffered content into underlying writer.
+func (w *BufferedWriter) Flush() error {
+	w.Lock()
+	defer w.Unlock()
+
+	return w.flushInternal()
+}
+
+func (w *BufferedWriter) flushInternal() error {
+	if w.buffer.IsEmpty() {
+		return nil
+	}
+
+	b := w.buffer
+	w.buffer = nil
+
+	if writer, ok := w.writer.(io.Writer); ok {
+		err := WriteAllBytes(writer, b.Bytes(), nil)
+		b.Release()
+		return err
+	}
+
+	return w.writer.WriteMultiBuffer(MultiBuffer{b})
+}
+
+// SetBuffered sets whether the internal buffer is used. If set to false, Flush() will be called to clear the buffer.
+func (w *BufferedWriter) SetBuffered(f bool) error {
+	w.Lock()
+	defer w.Unlock()
+
+	w.buffered = f
+	if !f {
+		return w.flushInternal()
+	}
+	return nil
+}
+
+// SetFlushNext will wait the next WriteMultiBuffer to flush and set buffered = false
+func (w *BufferedWriter) SetFlushNext() {
+	w.Lock()
+	defer w.Unlock()
+	w.flushNext = true
+}
+
+// ReadFrom implements io.ReaderFrom.
+func (w *BufferedWriter) ReadFrom(reader io.Reader) (int64, error) {
+	if err := w.SetBuffered(false); err != nil {
+		return 0, err
+	}
+
+	var sc SizeCounter
+	err := Copy(NewReader(reader), w, CountSize(&sc))
+	return sc.Size, err
+}
+
+// Close implements io.Closable.
+func (w *BufferedWriter) Close() error {
+	if err := w.Flush(); err != nil {
+		return err
+	}
+	return common.Close(w.writer)
+}
+
+// SequentialWriter is a Writer that writes MultiBuffer sequentially into the underlying io.Writer.
+type SequentialWriter struct {
+	io.Writer
+}
+
+// WriteMultiBuffer implements Writer.
+func (w *SequentialWriter) WriteMultiBuffer(mb MultiBuffer) error {
+	mb, err := WriteMultiBuffer(w.Writer, mb)
+	ReleaseMulti(mb)
+	return err
+}
+
+type noOpWriter byte
+
+func (noOpWriter) WriteMultiBuffer(b MultiBuffer) error {
+	ReleaseMulti(b)
+	return nil
+}
+
+func (noOpWriter) Write(b []byte) (int, error) {
+	return len(b), nil
+}
+
+func (noOpWriter) ReadFrom(reader io.Reader) (int64, error) {
+	b := New()
+	defer b.Release()
+
+	totalBytes := int64(0)
+	for {
+		b.Clear()
+		_, err := b.ReadFrom(reader)
+		totalBytes += int64(b.Len())
+		if err != nil {
+			if errors.Cause(err) == io.EOF {
+				return totalBytes, nil
+			}
+			return totalBytes, err
+		}
+	}
+}
+
+var (
+	// Discard is a Writer that swallows all contents written in.
+	Discard Writer = noOpWriter(0)
+
+	// DiscardBytes is an io.Writer that swallows all contents written in.
+	DiscardBytes io.Writer = noOpWriter(0)
+)

common/xray/bytespool/pool.go

@@ -0,0 +1,72 @@
+package bytespool
+
+import "sync"
+
+func createAllocFunc(size int32) func() interface{} {
+	return func() interface{} {
+		return make([]byte, size)
+	}
+}
+
+// The following parameters controls the size of buffer pools.
+// There are numPools pools. Starting from 2k size, the size of each pool is sizeMulti of the previous one.
+// Package buf is guaranteed to not use buffers larger than the largest pool.
+// Other packets may use larger buffers.
+const (
+	numPools  = 4
+	sizeMulti = 4
+)
+
+var (
+	pool     [numPools]sync.Pool
+	poolSize [numPools]int32
+)
+
+func init() {
+	size := int32(2048)
+	for i := 0; i < numPools; i++ {
+		pool[i] = sync.Pool{
+			New: createAllocFunc(size),
+		}
+		poolSize[i] = size
+		size *= sizeMulti
+	}
+}
+
+// GetPool returns a sync.Pool that generates bytes array with at least the given size.
+// It may return nil if no such pool exists.
+//
+// xray:api:stable
+func GetPool(size int32) *sync.Pool {
+	for idx, ps := range poolSize {
+		if size <= ps {
+			return &pool[idx]
+		}
+	}
+	return nil
+}
+
+// Alloc returns a byte slice with at least the given size. Minimum size of returned slice is 2048.
+//
+// xray:api:stable
+func Alloc(size int32) []byte {
+	pool := GetPool(size)
+	if pool != nil {
+		return pool.Get().([]byte)
+	}
+	return make([]byte, size)
+}
+
+// Free puts a byte slice into the internal pool.
+//
+// xray:api:stable
+func Free(b []byte) {
+	size := int32(cap(b))
+	b = b[0:cap(b)]
+	for i := numPools - 1; i >= 0; i-- {
+		if size >= poolSize[i] {
+			pool[i].Put(b)
+			return
+		}
+	}
+}

common/xray/common.go

@@ -0,0 +1,32 @@
+package common
+
+import "reflect"
+
+// Must panics if err is not nil.
+func Must(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+// Must2 panics if the second parameter is not nil, otherwise returns the first parameter.
+func Must2(v interface{}, err error) interface{} {
+	Must(err)
+	return v
+}
+
+// Error2 returns the err from the 2nd parameter.
+func Error2(v interface{}, err error) error {
+	return err
+}
+
+// CloseIfExists call obj.Close() if obj is not nil.
+func CloseIfExists(obj any) error {
+	if obj != nil {
+		v := reflect.ValueOf(obj)
+		if !v.IsNil() {
+			return Close(obj)
+		}
+	}
+	return nil
+}

common/xray/cpuid/cpuid.go

@@ -0,0 +1,18 @@
+package cpuid
+
+import (
+	"runtime"
+
+	"golang.org/x/sys/cpu"
+)
+
+var (
+	// Keep in sync with crypto/tls/cipher_suites.go.
+	hasGCMAsmAMD64 = cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
+	hasGCMAsmARM64 = cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
+	hasGCMAsmS390X = cpu.S390X.HasAES && cpu.S390X.HasAESCBC && cpu.S390X.HasGHASH
+	hasGCMAsmPPC64 = runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le"
+
+	// HasAESGCM indicates whether the CPU has AES-GCM hardware acceleration.
+	HasAESGCM = hasGCMAsmAMD64 || hasGCMAsmARM64 || hasGCMAsmS390X || hasGCMAsmPPC64
+)

common/xray/crypto/crypto.go

@@ -0,0 +1,17 @@
+package crypto
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+func RandBetween(from int64, to int64) int64 {
+	if from == to {
+		return from
+	}
+	if from > to {
+		from, to = to, from
+	}
+	bigInt, _ := rand.Int(rand.Reader, big.NewInt(to-from))
+	return from + bigInt.Int64()
+}

common/xray/errors/errors.go

@@ -0,0 +1,25 @@
+package errors
+
+type hasInnerError interface {
+	// Unwrap returns the underlying error of this one.
+	Unwrap() error
+}
+
+func Cause(err error) error {
+	if err == nil {
+		return nil
+	}
+L:
+	for {
+		switch inner := err.(type) {
+		case hasInnerError:
+			if inner.Unwrap() == nil {
+				break L
+			}
+			err = inner.Unwrap()
+		default:
+			break L
+		}
+	}
+	return err
+}

common/xray/interfaces.go

@@ -0,0 +1,52 @@
+package common
+
+// Closable is the interface for objects that can release its resources.
+//
+// xray:api:beta
+type Closable interface {
+	// Close release all resources used by this object, including goroutines.
+	Close() error
+}
+
+// Interruptible is an interface for objects that can be stopped before its completion.
+//
+// xray:api:beta
+type Interruptible interface {
+	Interrupt()
+}
+
+// Close closes the obj if it is a Closable.
+//
+// xray:api:beta
+func Close(obj interface{}) error {
+	if c, ok := obj.(Closable); ok {
+		return c.Close()
+	}
+	return nil
+}
+
+// Interrupt calls Interrupt() if object implements Interruptible interface, or Close() if the object implements Closable interface.
+//
+// xray:api:beta
+func Interrupt(obj interface{}) error {
+	if c, ok := obj.(Interruptible); ok {
+		c.Interrupt()
+		return nil
+	}
+	return Close(obj)
+}
+
+// Runnable is the interface for objects that can start to work and stop on demand.
+type Runnable interface {
+	// Start starts the runnable object. Upon the method returning nil, the object begins to function properly.
+	Start() error
+
+	Closable
+}
+
+// HasType is the interface for objects that knows its type.
+type HasType interface {
+	// Type returns the type of the object.
+	// Usually it returns (*Type)(nil) of the object.
+	Type() interface{}
+}

common/xray/json/badoption/range.go

@@ -0,0 +1,83 @@
+package badoption
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/sagernet/sing-box/common/xray/crypto"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+type Range struct {
+	From int32 `json:"from"`
+	To   int32 `json:"to"`
+}
+
+func (c *Range) Build() *Range {
+	return (*Range)(c)
+}
+
+func (c *Range) MarshalJSON() ([]byte, error) {
+	if c.From == c.To {
+		return json.Marshal(c.From)
+	}
+	return json.Marshal(fmt.Sprintf("%d-%d", c.From, c.To))
+}
+
+func (c *Range) UnmarshalJSON(content []byte) error {
+	var rangeValue struct {
+		From int32 `json:"from"`
+		To   int32 `json:"to"`
+	}
+	var stringValue string
+	err := json.Unmarshal(content, &stringValue)
+	if err == nil {
+		parts := strings.Split(stringValue, "-")
+		if len(parts) != 2 {
+			from, err := strconv.ParseInt(parts[0], 10, 32)
+			if err != nil {
+				return err
+			}
+			rangeValue.From, rangeValue.To = int32(from), int32(from)
+		} else {
+			from, err := strconv.ParseInt(parts[0], 10, 32)
+			if err != nil {
+				return err
+			}
+			to, err := strconv.ParseInt(parts[1], 10, 32)
+			if err != nil {
+				return err
+			}
+			rangeValue.From, rangeValue.To = int32(from), int32(to)
+		}
+	} else {
+		var int32Value int32
+		err := json.Unmarshal(content, &int32Value)
+		if err == nil {
+			rangeValue.From, rangeValue.To = int32Value, int32Value
+		} else {
+			err := json.Unmarshal(content, &rangeValue)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	if rangeValue.From > rangeValue.To {
+		return E.New("invalid range")
+	}
+	*c = Range{rangeValue.From, rangeValue.To}
+	return nil
+}
+
+func (c *Range) String() string {
+	if c.From == c.To {
+		return strconv.FormatInt(int64(c.From), 10)
+	}
+	return fmt.Sprintf("%d-%d", c.From, c.To)
+}
+
+func (c Range) Rand() int32 {
+	return int32(crypto.RandBetween(int64(c.From), int64(c.To)))
+}

common/xray/net/address.go

@@ -0,0 +1,181 @@
+package net
+
+import (
+	"bytes"
+	"net"
+	"strings"
+)
+
+var (
+	// LocalHostIP is a constant value for localhost IP in IPv4.
+	LocalHostIP = IPAddress([]byte{127, 0, 0, 1})
+
+	// AnyIP is a constant value for any IP in IPv4.
+	AnyIP = IPAddress([]byte{0, 0, 0, 0})
+
+	// LocalHostDomain is a constant value for localhost domain.
+	LocalHostDomain = DomainAddress("localhost")
+
+	// LocalHostIPv6 is a constant value for localhost IP in IPv6.
+	LocalHostIPv6 = IPAddress([]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1})
+
+	// AnyIPv6 is a constant value for any IP in IPv6.
+	AnyIPv6 = IPAddress([]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
+)
+
+// AddressFamily is the type of address.
+type AddressFamily byte
+
+const (
+	// AddressFamilyIPv4 represents address as IPv4
+	AddressFamilyIPv4 = AddressFamily(0)
+
+	// AddressFamilyIPv6 represents address as IPv6
+	AddressFamilyIPv6 = AddressFamily(1)
+
+	// AddressFamilyDomain represents address as Domain
+	AddressFamilyDomain = AddressFamily(2)
+)
+
+// IsIPv4 returns true if current AddressFamily is IPv4.
+func (af AddressFamily) IsIPv4() bool {
+	return af == AddressFamilyIPv4
+}
+
+// IsIPv6 returns true if current AddressFamily is IPv6.
+func (af AddressFamily) IsIPv6() bool {
+	return af == AddressFamilyIPv6
+}
+
+// IsIP returns true if current AddressFamily is IPv6 or IPv4.
+func (af AddressFamily) IsIP() bool {
+	return af == AddressFamilyIPv4 || af == AddressFamilyIPv6
+}
+
+// IsDomain returns true if current AddressFamily is Domain.
+func (af AddressFamily) IsDomain() bool {
+	return af == AddressFamilyDomain
+}
+
+// Address represents a network address to be communicated with. It may be an IP address or domain
+// address, not both. This interface doesn't resolve IP address for a given domain.
+type Address interface {
+	IP() net.IP     // IP of this Address
+	Domain() string // Domain of this Address
+	Family() AddressFamily
+
+	String() string // String representation of this Address
+}
+
+func isAlphaNum(c byte) bool {
+	return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
+}
+
+// ParseAddress parses a string into an Address. The return value will be an IPAddress when
+// the string is in the form of IPv4 or IPv6 address, or a DomainAddress otherwise.
+func ParseAddress(addr string) Address {
+	// Handle IPv6 address in form as "[2001:4860:0:2001::68]"
+	lenAddr := len(addr)
+	if lenAddr > 0 && addr[0] == '[' && addr[lenAddr-1] == ']' {
+		addr = addr[1 : lenAddr-1]
+		lenAddr -= 2
+	}
+
+	if lenAddr > 0 && (!isAlphaNum(addr[0]) || !isAlphaNum(addr[len(addr)-1])) {
+		addr = strings.TrimSpace(addr)
+	}
+
+	ip := net.ParseIP(addr)
+	if ip != nil {
+		return IPAddress(ip)
+	}
+	return DomainAddress(addr)
+}
+
+var bytes0 = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
+
+// IPAddress creates an Address with given IP.
+func IPAddress(ip []byte) Address {
+	switch len(ip) {
+	case net.IPv4len:
+		var addr ipv4Address = [4]byte{ip[0], ip[1], ip[2], ip[3]}
+		return addr
+	case net.IPv6len:
+		if bytes.Equal(ip[:10], bytes0) && ip[10] == 0xff && ip[11] == 0xff {
+			return IPAddress(ip[12:16])
+		}
+		var addr ipv6Address = [16]byte{
+			ip[0], ip[1], ip[2], ip[3],
+			ip[4], ip[5], ip[6], ip[7],
+			ip[8], ip[9], ip[10], ip[11],
+			ip[12], ip[13], ip[14], ip[15],
+		}
+		return addr
+	default:
+		return nil
+	}
+}
+
+// DomainAddress creates an Address with given domain.
+// This is an internal function that forcibly converts a string to domain.
+// It's mainly used in test files and mux.
+// Unless you have a specific reason, use net.ParseAddress instead,
+// as this function does not check whether the input is an IP address.
+// Otherwise, you will get strange results like domain: 1.1.1.1
+func DomainAddress(domain string) Address {
+	return domainAddress(domain)
+}
+
+type ipv4Address [4]byte
+
+func (a ipv4Address) IP() net.IP {
+	return net.IP(a[:])
+}
+
+func (ipv4Address) Domain() string {
+	panic("Calling Domain() on an IPv4Address.")
+}
+
+func (ipv4Address) Family() AddressFamily {
+	return AddressFamilyIPv4
+}
+
+func (a ipv4Address) String() string {
+	return a.IP().String()
+}
+
+type ipv6Address [16]byte
+
+func (a ipv6Address) IP() net.IP {
+	return net.IP(a[:])
+}
+
+func (ipv6Address) Domain() string {
+	panic("Calling Domain() on an IPv6Address.")
+}
+
+func (ipv6Address) Family() AddressFamily {
+	return AddressFamilyIPv6
+}
+
+func (a ipv6Address) String() string {
+	return "[" + a.IP().String() + "]"
+}
+
+type domainAddress string
+
+func (domainAddress) IP() net.IP {
+	panic("Calling IP() on a DomainAddress.")
+}
+
+func (a domainAddress) Domain() string {
+	return string(a)
+}
+
+func (domainAddress) Family() AddressFamily {
+	return AddressFamilyDomain
+}
+
+func (a domainAddress) String() string {
+	return a.Domain()
+}

common/xray/net/destination.go

@@ -0,0 +1,146 @@
+package net
+
+import (
+	"net"
+	"strings"
+)
+
+// Destination represents a network destination including address and protocol (tcp / udp).
+type Destination struct {
+	Address Address
+	Port    Port
+	Network Network
+}
+
+// DestinationFromAddr generates a Destination from a net address.
+func DestinationFromAddr(addr net.Addr) Destination {
+	switch addr := addr.(type) {
+	case *net.TCPAddr:
+		return TCPDestination(IPAddress(addr.IP), Port(addr.Port))
+	case *net.UDPAddr:
+		return UDPDestination(IPAddress(addr.IP), Port(addr.Port))
+	case *net.UnixAddr:
+		return UnixDestination(DomainAddress(addr.Name))
+	default:
+		panic("Net: Unknown address type.")
+	}
+}
+
+// ParseDestination converts a destination from its string presentation.
+func ParseDestination(dest string) (Destination, error) {
+	d := Destination{
+		Address: AnyIP,
+		Port:    Port(0),
+	}
+	if strings.HasPrefix(dest, "tcp:") {
+		d.Network = Network_TCP
+		dest = dest[4:]
+	} else if strings.HasPrefix(dest, "udp:") {
+		d.Network = Network_UDP
+		dest = dest[4:]
+	} else if strings.HasPrefix(dest, "unix:") {
+		d = UnixDestination(DomainAddress(dest[5:]))
+		return d, nil
+	}
+
+	hstr, pstr, err := SplitHostPort(dest)
+	if err != nil {
+		return d, err
+	}
+	if len(hstr) > 0 {
+		d.Address = ParseAddress(hstr)
+	}
+	if len(pstr) > 0 {
+		port, err := PortFromString(pstr)
+		if err != nil {
+			return d, err
+		}
+		d.Port = port
+	}
+	return d, nil
+}
+
+// TCPDestination creates a TCP destination with given address
+func TCPDestination(address Address, port Port) Destination {
+	return Destination{
+		Network: Network_TCP,
+		Address: address,
+		Port:    port,
+	}
+}
+
+// UDPDestination creates a UDP destination with given address
+func UDPDestination(address Address, port Port) Destination {
+	return Destination{
+		Network: Network_UDP,
+		Address: address,
+		Port:    port,
+	}
+}
+
+// UnixDestination creates a Unix destination with given address
+func UnixDestination(address Address) Destination {
+	return Destination{
+		Network: Network_UNIX,
+		Address: address,
+	}
+}
+
+// NetAddr returns the network address in this Destination in string form.
+func (d Destination) NetAddr() string {
+	addr := ""
+	if d.Network == Network_TCP || d.Network == Network_UDP {
+		addr = d.Address.String() + ":" + d.Port.String()
+	} else if d.Network == Network_UNIX {
+		addr = d.Address.String()
+	}
+	return addr
+}
+
+// RawNetAddr converts a net.Addr from its Destination presentation.
+func (d Destination) RawNetAddr() net.Addr {
+	var addr net.Addr
+	switch d.Network {
+	case Network_TCP:
+		if d.Address.Family().IsIP() {
+			addr = &net.TCPAddr{
+				IP:   d.Address.IP(),
+				Port: int(d.Port),
+			}
+		}
+	case Network_UDP:
+		if d.Address.Family().IsIP() {
+			addr = &net.UDPAddr{
+				IP:   d.Address.IP(),
+				Port: int(d.Port),
+			}
+		}
+	case Network_UNIX:
+		if d.Address.Family().IsDomain() {
+			addr = &net.UnixAddr{
+				Name: d.Address.String(),
+				Net:  d.Network.SystemString(),
+			}
+		}
+	}
+	return addr
+}
+
+// String returns the strings form of this Destination.
+func (d Destination) String() string {
+	prefix := "unknown:"
+	switch d.Network {
+	case Network_TCP:
+		prefix = "tcp:"
+	case Network_UDP:
+		prefix = "udp:"
+	case Network_UNIX:
+		prefix = "unix:"
+	}
+	return prefix + d.NetAddr()
+}
+
+// IsValid returns true if this Destination is valid.
+func (d Destination) IsValid() bool {
+	return d.Network != Network_Unknown
+}

common/xray/net/net.go

@@ -0,0 +1,13 @@
+package net
+
+import "time"
+
+// defines the maximum time an idle TCP session can survive in the tunnel, so
+// it should be consistent across HTTP versions and with other transports.
+const ConnIdleTimeout = 300 * time.Second
+
+// consistent with quic-go
+const QuicgoH3KeepAlivePeriod = 10 * time.Second
+
+// consistent with chrome
+const ChromeH2KeepAlivePeriod = 45 * time.Second

common/xray/net/network.go

@@ -0,0 +1,33 @@
+package net
+
+type Network int32
+
+const (
+	Network_Unknown Network = 0
+	Network_TCP     Network = 2
+	Network_UDP     Network = 3
+	Network_UNIX    Network = 4
+)
+
+func (n Network) SystemString() string {
+	switch n {
+	case Network_TCP:
+		return "tcp"
+	case Network_UDP:
+		return "udp"
+	case Network_UNIX:
+		return "unix"
+	default:
+		return "unknown"
+	}
+}
+
+// HasNetwork returns true if the network list has a certain network.
+func HasNetwork(list []Network, network Network) bool {
+	for _, value := range list {
+		if value == network {
+			return true
+		}
+	}
+	return false
+}

common/xray/net/port.go

@@ -0,0 +1,55 @@
+package net
+
+import (
+	"encoding/binary"
+	"strconv"
+
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+// Port represents a network port in TCP and UDP protocol.
+type Port uint16
+
+// PortFromBytes converts a byte array to a Port, assuming bytes are in big endian order.
+// @unsafe Caller must ensure that the byte array has at least 2 elements.
+func PortFromBytes(port []byte) Port {
+	return Port(binary.BigEndian.Uint16(port))
+}
+
+// PortFromInt converts an integer to a Port.
+// @error when the integer is not positive or larger then 65535
+func PortFromInt(val uint32) (Port, error) {
+	if val > 65535 {
+		return Port(0), E.New("invalid port range: ", val)
+	}
+	return Port(val), nil
+}
+
+// PortFromString converts a string to a Port.
+// @error when the string is not an integer or the integral value is a not a valid Port.
+func PortFromString(s string) (Port, error) {
+	val, err := strconv.ParseUint(s, 10, 32)
+	if err != nil {
+		return Port(0), E.New("invalid port range: ", s)
+	}
+	return PortFromInt(uint32(val))
+}
+
+// Value return the corresponding uint16 value of a Port.
+func (p Port) Value() uint16 {
+	return uint16(p)
+}
+
+// String returns the string presentation of a Port.
+func (p Port) String() string {
+	return strconv.Itoa(int(p))
+}
+
+type MemoryPortRange struct {
+	From Port
+	To   Port
+}
+
+func (r MemoryPortRange) Contains(port Port) bool {
+	return r.From <= port && port <= r.To
+}

common/xray/net/system.go

@@ -0,0 +1,84 @@
+package net
+
+import "net"
+
+// DialTCP is an alias of net.DialTCP.
+var (
+	DialTCP  = net.DialTCP
+	DialUDP  = net.DialUDP
+	DialUnix = net.DialUnix
+	Dial     = net.Dial
+)
+
+type ListenConfig = net.ListenConfig
+
+var (
+	Listen     = net.Listen
+	ListenTCP  = net.ListenTCP
+	ListenUDP  = net.ListenUDP
+	ListenUnix = net.ListenUnix
+)
+
+var LookupIP = net.LookupIP
+
+var FileConn = net.FileConn
+
+// ParseIP is an alias of net.ParseIP
+var ParseIP = net.ParseIP
+
+var SplitHostPort = net.SplitHostPort
+
+var CIDRMask = net.CIDRMask
+
+type (
+	Addr       = net.Addr
+	Conn       = net.Conn
+	PacketConn = net.PacketConn
+)
+
+type (
+	TCPAddr = net.TCPAddr
+	TCPConn = net.TCPConn
+)
+
+type (
+	UDPAddr = net.UDPAddr
+	UDPConn = net.UDPConn
+)
+
+type (
+	UnixAddr = net.UnixAddr
+	UnixConn = net.UnixConn
+)
+
+// IP is an alias for net.IP.
+type (
+	IP     = net.IP
+	IPMask = net.IPMask
+	IPNet  = net.IPNet
+)
+
+const (
+	IPv4len = net.IPv4len
+	IPv6len = net.IPv6len
+)
+
+type (
+	Error     = net.Error
+	AddrError = net.AddrError
+)
+
+type (
+	Dialer       = net.Dialer
+	Listener     = net.Listener
+	TCPListener  = net.TCPListener
+	UnixListener = net.UnixListener
+)
+
+var (
+	ResolveTCPAddr  = net.ResolveTCPAddr
+	ResolveUDPAddr  = net.ResolveUDPAddr
+	ResolveUnixAddr = net.ResolveUnixAddr
+)
+
+type Resolver = net.Resolver

common/xray/pipe/impl.go

@@ -0,0 +1,209 @@
+package pipe
+
+import (
+	"errors"
+	"io"
+	"sync"
+	"time"
+
+	"github.com/sagernet/sing-box/common/xray"
+	"github.com/sagernet/sing-box/common/xray/buf"
+	"github.com/sagernet/sing-box/common/xray/signal"
+	"github.com/sagernet/sing-box/common/xray/signal/done"
+)
+
+type state byte
+
+const (
+	open state = iota
+	closed
+	errord
+)
+
+type pipeOption struct {
+	limit           int32 // maximum buffer size in bytes
+	discardOverflow bool
+}
+
+func (o *pipeOption) isFull(curSize int32) bool {
+	return o.limit >= 0 && curSize > o.limit
+}
+
+type pipe struct {
+	sync.Mutex
+	data        buf.MultiBuffer
+	readSignal  *signal.Notifier
+	writeSignal *signal.Notifier
+	done        *done.Instance
+	errChan     chan error
+	option      pipeOption
+	state       state
+}
+
+var (
+	errBufferFull = errors.New("buffer full")
+	errSlowDown   = errors.New("slow down")
+)
+
+func (p *pipe) Len() int32 {
+	data := p.data
+	if data == nil {
+		return 0
+	}
+	return data.Len()
+}
+
+func (p *pipe) getState(forRead bool) error {
+	switch p.state {
+	case open:
+		if !forRead && p.option.isFull(p.data.Len()) {
+			return errBufferFull
+		}
+		return nil
+	case closed:
+		if !forRead {
+			return io.ErrClosedPipe
+		}
+		if !p.data.IsEmpty() {
+			return nil
+		}
+		return io.EOF
+	case errord:
+		return io.ErrClosedPipe
+	default:
+		panic("impossible case")
+	}
+}
+
+func (p *pipe) readMultiBufferInternal() (buf.MultiBuffer, error) {
+	p.Lock()
+	defer p.Unlock()
+
+	if err := p.getState(true); err != nil {
+		return nil, err
+	}
+
+	data := p.data
+	p.data = nil
+	return data, nil
+}
+
+func (p *pipe) ReadMultiBuffer() (buf.MultiBuffer, error) {
+	for {
+		data, err := p.readMultiBufferInternal()
+		if data != nil || err != nil {
+			p.writeSignal.Signal()
+			return data, err
+		}
+
+		select {
+		case <-p.readSignal.Wait():
+		case <-p.done.Wait():
+		case err = <-p.errChan:
+			return nil, err
+		}
+	}
+}
+
+func (p *pipe) ReadMultiBufferTimeout(d time.Duration) (buf.MultiBuffer, error) {
+	timer := time.NewTimer(d)
+	defer timer.Stop()
+
+	for {
+		data, err := p.readMultiBufferInternal()
+		if data != nil || err != nil {
+			p.writeSignal.Signal()
+			return data, err
+		}
+
+		select {
+		case <-p.readSignal.Wait():
+		case <-p.done.Wait():
+		case <-timer.C:
+			return nil, buf.ErrReadTimeout
+		}
+	}
+}
+
+func (p *pipe) writeMultiBufferInternal(mb buf.MultiBuffer) error {
+	p.Lock()
+	defer p.Unlock()
+
+	if err := p.getState(false); err != nil {
+		return err
+	}
+
+	if p.data == nil {
+		p.data = mb
+	} else {
+		p.data, _ = buf.MergeMulti(p.data, mb)
+	}
+	return nil
+}
+
+func (p *pipe) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	if mb.IsEmpty() {
+		return nil
+	}
+
+	for {
+		err := p.writeMultiBufferInternal(mb)
+		if err == nil {
+			p.readSignal.Signal()
+			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
+			}
+		}
+
+		buf.ReleaseMulti(mb)
+		p.readSignal.Signal()
+		return err
+	}
+}
+
+func (p *pipe) Close() error {
+	p.Lock()
+	defer p.Unlock()
+
+	if p.state == closed || p.state == errord {
+		return nil
+	}
+
+	p.state = closed
+	common.Must(p.done.Close())
+	return nil
+}
+
+// Interrupt implements common.Interruptible.
+func (p *pipe) Interrupt() {
+	p.Lock()
+	defer p.Unlock()
+
+	if !p.data.IsEmpty() {
+		buf.ReleaseMulti(p.data)
+		p.data = nil
+		if p.state == closed {
+			p.state = errord
+		}
+	}
+
+	if p.state == closed || p.state == errord {
+		return
+	}
+
+	p.state = errord
+
+	common.Must(p.done.Close())
+}

common/xray/pipe/pipe.go

@@ -0,0 +1,53 @@
+package pipe
+
+import (
+	"github.com/sagernet/sing-box/common/xray/signal"
+	"github.com/sagernet/sing-box/common/xray/signal/done"
+)
+
+// Option for creating new Pipes.
+type Option func(*pipeOption)
+
+// WithoutSizeLimit returns an Option for Pipe to have no size limit.
+func WithoutSizeLimit() Option {
+	return func(opt *pipeOption) {
+		opt.limit = -1
+	}
+}
+
+// WithSizeLimit returns an Option for Pipe to have the given size limit.
+func WithSizeLimit(limit int32) Option {
+	return func(opt *pipeOption) {
+		opt.limit = limit
+	}
+}
+
+// DiscardOverflow returns an Option for Pipe to discard writes if full.
+func DiscardOverflow() Option {
+	return func(opt *pipeOption) {
+		opt.discardOverflow = true
+	}
+}
+
+// New creates a new Reader and Writer that connects to each other.
+func New(opts ...Option) (*Reader, *Writer) {
+	p := &pipe{
+		readSignal:  signal.NewNotifier(),
+		writeSignal: signal.NewNotifier(),
+		done:        done.New(),
+		errChan:     make(chan error, 1),
+		option: pipeOption{
+			limit: -1,
+		},
+	}
+
+	for _, opt := range opts {
+		opt(&p.option)
+	}
+
+	return &Reader{
+			pipe: p,
+		}, &Writer{
+			pipe: p,
+		}
+}

common/xray/pipe/reader.go

@@ -0,0 +1,41 @@
+package pipe
+
+import (
+	"time"
+
+	"github.com/sagernet/sing-box/common/xray/buf"
+)
+
+// Reader is a buf.Reader that reads content from a pipe.
+type Reader struct {
+	pipe *pipe
+}
+
+// ReadMultiBuffer implements buf.Reader.
+func (r *Reader) ReadMultiBuffer() (buf.MultiBuffer, error) {
+	return r.pipe.ReadMultiBuffer()
+}
+
+// ReadMultiBufferTimeout reads content from a pipe within the given duration, or returns buf.ErrTimeout otherwise.
+func (r *Reader) ReadMultiBufferTimeout(d time.Duration) (buf.MultiBuffer, error) {
+	return r.pipe.ReadMultiBufferTimeout(d)
+}
+
+// Interrupt implements common.Interruptible.
+func (r *Reader) Interrupt() {
+	r.pipe.Interrupt()
+}
+
+// ReturnAnError makes ReadMultiBuffer return an error, only once.
+func (r *Reader) ReturnAnError(err error) {
+	r.pipe.errChan <- err
+}
+
+// Recover catches an error set by ReturnAnError, if exists.
+func (r *Reader) Recover() (err error) {
+	select {
+	case err = <-r.pipe.errChan:
+	default:
+	}
+	return
+}

common/xray/pipe/writer.go

@@ -0,0 +1,29 @@
+package pipe
+
+import (
+	"github.com/sagernet/sing-box/common/xray/buf"
+)
+
+// Writer is a buf.Writer that writes data into a pipe.
+type Writer struct {
+	pipe *pipe
+}
+
+// WriteMultiBuffer implements buf.Writer.
+func (w *Writer) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	return w.pipe.WriteMultiBuffer(mb)
+}
+
+// Close implements io.Closer. After the pipe is closed, writing to the pipe will return io.ErrClosedPipe, while reading will return io.EOF.
+func (w *Writer) Close() error {
+	return w.pipe.Close()
+}
+
+func (w *Writer) Len() int32 {
+	return w.pipe.Len()
+}
+
+// Interrupt implements common.Interruptible.
+func (w *Writer) Interrupt() {
+	w.pipe.Interrupt()
+}

common/xray/serial/serial.go

@@ -0,0 +1,29 @@
+package serial
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+// ReadUint16 reads first two bytes from the reader, and then converts them to an uint16 value.
+func ReadUint16(reader io.Reader) (uint16, error) {
+	var b [2]byte
+	if _, err := io.ReadFull(reader, b[:]); err != nil {
+		return 0, err
+	}
+	return binary.BigEndian.Uint16(b[:]), nil
+}
+
+// WriteUint16 writes an uint16 value into writer.
+func WriteUint16(writer io.Writer, value uint16) (int, error) {
+	var b [2]byte
+	binary.BigEndian.PutUint16(b[:], value)
+	return writer.Write(b[:])
+}
+
+// WriteUint64 writes an uint64 value into writer.
+func WriteUint64(writer io.Writer, value uint64) (int, error) {
+	var b [8]byte
+	binary.BigEndian.PutUint64(b[:], value)
+	return writer.Write(b[:])
+}

common/xray/serial/string.go

@@ -0,0 +1,35 @@
+package serial
+
+import (
+	"fmt"
+	"strings"
+)
+
+// ToString serializes an arbitrary value into string.
+func ToString(v interface{}) string {
+	if v == nil {
+		return ""
+	}
+
+	switch value := v.(type) {
+	case string:
+		return value
+	case *string:
+		return *value
+	case fmt.Stringer:
+		return value.String()
+	case error:
+		return value.Error()
+	default:
+		return fmt.Sprintf("%+v", value)
+	}
+}
+
+// Concat concatenates all input into a single string.
+func Concat(v ...interface{}) string {
+	builder := strings.Builder{}
+	for _, value := range v {
+		builder.WriteString(ToString(value))
+	}
+	return builder.String()
+}

common/xray/signal/done/done.go

@@ -0,0 +1,49 @@
+package done
+
+import (
+	"sync"
+)
+
+// Instance is a utility for notifications of something being done.
+type Instance struct {
+	access sync.Mutex
+	c      chan struct{}
+	closed bool
+}
+
+// New returns a new Done.
+func New() *Instance {
+	return &Instance{
+		c: make(chan struct{}),
+	}
+}
+
+// Done returns true if Close() is called.
+func (d *Instance) Done() bool {
+	select {
+	case <-d.Wait():
+		return true
+	default:
+		return false
+	}
+}
+
+// Wait returns a channel for waiting for done.
+func (d *Instance) Wait() <-chan struct{} {
+	return d.c
+}
+
+// Close marks this Done 'done'. This method may be called multiple times. All calls after first call will have no effect on its status.
+func (d *Instance) Close() error {
+	d.access.Lock()
+	defer d.access.Unlock()
+
+	if d.closed {
+		return nil
+	}
+
+	d.closed = true
+	close(d.c)
+
+	return nil
+}

common/xray/signal/notifier.go

@@ -0,0 +1,26 @@
+package signal
+
+// Notifier is a utility for notifying changes. The change producer may notify changes multiple time, and the consumer may get notified asynchronously.
+type Notifier struct {
+	c chan struct{}
+}
+
+// NewNotifier creates a new Notifier.
+func NewNotifier() *Notifier {
+	return &Notifier{
+		c: make(chan struct{}, 1),
+	}
+}
+
+// Signal signals a change, usually by producer. This method never blocks.
+func (n *Notifier) Signal() {
+	select {
+	case n.c <- struct{}{}:
+	default:
+	}
+}
+
+// Wait returns a channel for waiting for changes. The returned channel never gets closed.
+func (n *Notifier) Wait() <-chan struct{} {
+	return n.c
+}

common/xray/signal/pubsub/pubsub.go

@@ -0,0 +1,105 @@
+package pubsub
+
+import (
+	"errors"
+	"sync"
+	"time"
+
+	"github.com/sagernet/sing-box/common/xray"
+	"github.com/sagernet/sing-box/common/xray/signal/done"
+	"github.com/sagernet/sing-box/common/xray/task"
+)
+
+type Subscriber struct {
+	buffer chan interface{}
+	done   *done.Instance
+}
+
+func (s *Subscriber) push(msg interface{}) {
+	select {
+	case s.buffer <- msg:
+	default:
+	}
+}
+
+func (s *Subscriber) Wait() <-chan interface{} {
+	return s.buffer
+}
+
+func (s *Subscriber) Close() error {
+	return s.done.Close()
+}
+
+func (s *Subscriber) IsClosed() bool {
+	return s.done.Done()
+}
+
+type Service struct {
+	sync.RWMutex
+	subs  map[string][]*Subscriber
+	ctask *task.Periodic
+}
+
+func NewService() *Service {
+	s := &Service{
+		subs: make(map[string][]*Subscriber),
+	}
+	s.ctask = &task.Periodic{
+		Execute:  s.Cleanup,
+		Interval: time.Second * 30,
+	}
+	return s
+}
+
+// Cleanup cleans up internal caches of subscribers.
+// Visible for testing only.
+func (s *Service) Cleanup() error {
+	s.Lock()
+	defer s.Unlock()
+
+	if len(s.subs) == 0 {
+		return errors.New("nothing to do")
+	}
+
+	for name, subs := range s.subs {
+		newSub := make([]*Subscriber, 0, len(s.subs))
+		for _, sub := range subs {
+			if !sub.IsClosed() {
+				newSub = append(newSub, sub)
+			}
+		}
+		if len(newSub) == 0 {
+			delete(s.subs, name)
+		} else {
+			s.subs[name] = newSub
+		}
+	}
+
+	if len(s.subs) == 0 {
+		s.subs = make(map[string][]*Subscriber)
+	}
+	return nil
+}
+
+func (s *Service) Subscribe(name string) *Subscriber {
+	sub := &Subscriber{
+		buffer: make(chan interface{}, 16),
+		done:   done.New(),
+	}
+	s.Lock()
+	s.subs[name] = append(s.subs[name], sub)
+	s.Unlock()
+	common.Must(s.ctask.Start())
+	return sub
+}
+
+func (s *Service) Publish(name string, message interface{}) {
+	s.RLock()
+	defer s.RUnlock()
+
+	for _, sub := range s.subs[name] {
+		if !sub.IsClosed() {
+			sub.push(message)
+		}
+	}
+}

common/xray/signal/semaphore/semaphore.go

@@ -0,0 +1,27 @@
+package semaphore
+
+// Instance is an implementation of semaphore.
+type Instance struct {
+	token chan struct{}
+}
+
+// New create a new Semaphore with n permits.
+func New(n int) *Instance {
+	s := &Instance{
+		token: make(chan struct{}, n),
+	}
+	for i := 0; i < n; i++ {
+		s.token <- struct{}{}
+	}
+	return s
+}
+
+// Wait returns a channel for acquiring a permit.
+func (s *Instance) Wait() <-chan struct{} {
+	return s.token
+}
+
+// Signal releases a permit into the semaphore.
+func (s *Instance) Signal() {
+	s.token <- struct{}{}
+}

common/xray/signal/timer.go

@@ -0,0 +1,85 @@
+package signal
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/sagernet/sing-box/common/xray"
+	"github.com/sagernet/sing-box/common/xray/task"
+)
+
+type ActivityUpdater interface {
+	Update()
+}
+
+type ActivityTimer struct {
+	mu        sync.RWMutex
+	updated   chan struct{}
+	checkTask *task.Periodic
+	onTimeout func()
+	consumed  atomic.Bool
+	once      sync.Once
+}
+
+func (t *ActivityTimer) Update() {
+	select {
+	case t.updated <- struct{}{}:
+	default:
+	}
+}
+
+func (t *ActivityTimer) check() error {
+	select {
+	case <-t.updated:
+	default:
+		t.finish()
+	}
+	return nil
+}
+
+func (t *ActivityTimer) finish() {
+	t.once.Do(func() {
+		t.consumed.Store(true)
+		t.mu.Lock()
+		defer t.mu.Unlock()
+
+		common.CloseIfExists(t.checkTask)
+		t.onTimeout()
+	})
+}
+
+func (t *ActivityTimer) SetTimeout(timeout time.Duration) {
+	if t.consumed.Load() {
+		return
+	}
+	if timeout == 0 {
+		t.finish()
+		return
+	}
+
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	// double check, just in case
+	if t.consumed.Load() {
+		return
+	}
+	newCheckTask := &task.Periodic{
+		Interval: timeout,
+		Execute:  t.check,
+	}
+	common.CloseIfExists(t.checkTask)
+	t.checkTask = newCheckTask
+	t.Update()
+	common.Must(newCheckTask.Start())
+}
+
+func CancelAfterInactivity(ctx context.Context, cancel context.CancelFunc, timeout time.Duration) *ActivityTimer {
+	timer := &ActivityTimer{
+		updated:   make(chan struct{}, 1),
+		onTimeout: cancel,
+	}
+	timer.SetTimeout(timeout)
+	return timer
+}

common/xray/stat/connection.go

@@ -0,0 +1,34 @@
+package stat
+
+import (
+	"net"
+
+	"github.com/sagernet/sing-box/common/xray/stats"
+)
+
+type Connection interface {
+	net.Conn
+}
+
+type CounterConnection struct {
+	Connection
+	ReadCounter  stats.Counter
+	WriteCounter stats.Counter
+}
+
+func (c *CounterConnection) Read(b []byte) (int, error) {
+	nBytes, err := c.Connection.Read(b)
+	if c.ReadCounter != nil {
+		c.ReadCounter.Add(int64(nBytes))
+	}
+
+	return nBytes, err
+}
+
+func (c *CounterConnection) Write(b []byte) (int, error) {
+	nBytes, err := c.Connection.Write(b)
+	if c.WriteCounter != nil {
+		c.WriteCounter.Add(int64(nBytes))
+	}
+	return nBytes, err
+}

common/xray/stats/stats.go

@@ -0,0 +1,13 @@
+package stats
+
+// Counter is the interface for stats counters.
+//
+// xray:api:stable
+type Counter interface {
+	// Value is the current value of the counter.
+	Value() int64
+	// Set sets a new value to the counter, and returns the previous one.
+	Set(int64) int64
+	// Add adds a value to the current counter value, and returns the previous value.
+	Add(int64) int64
+}

common/xray/task/common.go

@@ -0,0 +1,10 @@
+package task
+
+import "github.com/sagernet/sing-box/common/xray"
+
+// Close returns a func() that closes v.
+func Close(v interface{}) func() error {
+	return func() error {
+		return common.Close(v)
+	}
+}

common/xray/task/periodic.go

@@ -0,0 +1,85 @@
+package task
+
+import (
+	"sync"
+	"time"
+)
+
+// Periodic is a task that runs periodically.
+type Periodic struct {
+	// Interval of the task being run
+	Interval time.Duration
+	// Execute is the task function
+	Execute func() error
+
+	access  sync.Mutex
+	timer   *time.Timer
+	running bool
+}
+
+func (t *Periodic) hasClosed() bool {
+	t.access.Lock()
+	defer t.access.Unlock()
+
+	return !t.running
+}
+
+func (t *Periodic) checkedExecute() error {
+	if t.hasClosed() {
+		return nil
+	}
+
+	if err := t.Execute(); err != nil {
+		t.access.Lock()
+		t.running = false
+		t.access.Unlock()
+		return err
+	}
+
+	t.access.Lock()
+	defer t.access.Unlock()
+
+	if !t.running {
+		return nil
+	}
+
+	t.timer = time.AfterFunc(t.Interval, func() {
+		t.checkedExecute()
+	})
+
+	return nil
+}
+
+// Start implements common.Runnable.
+func (t *Periodic) Start() error {
+	t.access.Lock()
+	if t.running {
+		t.access.Unlock()
+		return nil
+	}
+	t.running = true
+	t.access.Unlock()
+
+	if err := t.checkedExecute(); err != nil {
+		t.access.Lock()
+		t.running = false
+		t.access.Unlock()
+		return err
+	}
+
+	return nil
+}
+
+// Close implements common.Closable.
+func (t *Periodic) Close() error {
+	t.access.Lock()
+	defer t.access.Unlock()
+
+	t.running = false
+	if t.timer != nil {
+		t.timer.Stop()
+		t.timer = nil
+	}
+
+	return nil
+}

common/xray/task/task.go

@@ -0,0 +1,64 @@
+package task
+
+import (
+	"context"
+
+	"github.com/sagernet/sing-box/common/xray/signal/semaphore"
+)
+
+// OnSuccess executes g() after f() returns nil.
+func OnSuccess(f func() error, g func() error) func() error {
+	return func() error {
+		if err := f(); err != nil {
+			return err
+		}
+		return g()
+	}
+}
+
+// Run executes a list of tasks in parallel, returns the first error encountered or nil if all tasks pass.
+func Run(ctx context.Context, tasks ...func() error) error {
+	n := len(tasks)
+	s := semaphore.New(n)
+	done := make(chan error, 1)
+
+	for _, task := range tasks {
+		<-s.Wait()
+		go func(f func() error) {
+			err := f()
+			if err == nil {
+				s.Signal()
+				return
+			}
+
+			select {
+			case done <- err:
+			default:
+			}
+		}(task)
+	}
+
+	/*
+		if altctx := ctx.Value("altctx"); altctx != nil {
+			ctx = altctx.(context.Context)
+		}
+	*/
+
+	for i := 0; i < n; i++ {
+		select {
+		case err := <-done:
+			return err
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-s.Wait():
+		}
+	}
+
+	/*
+		if cancel := ctx.Value("cancel"); cancel != nil {
+			cancel.(context.CancelFunc)()
+		}
+	*/
+
+	return nil
+}

common/xray/utils/browser.go

@@ -0,0 +1,256 @@
+package utils
+
+import (
+	"hash/fnv"
+	"math"
+	"math/rand"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/klauspost/cpuid/v2"
+)
+
+func GetRandomizer() *rand.Rand {
+	// Seed the PRNG with the hash of CPU info, increasing the overall probable space.
+	fnvHash := fnv.New64()
+	fnvHash.Write([]byte(strconv.Itoa(cpuid.CPU.Family) + strconv.Itoa(cpuid.CPU.Model) + strconv.Itoa(cpuid.CPU.PhysicalCores) + strconv.Itoa(cpuid.CPU.LogicalCores) + strconv.Itoa(cpuid.CPU.CacheLine) + strconv.Itoa(cpuid.CPU.ThreadsPerCore)))
+	return rand.New(rand.NewSource(int64(fnvHash.Sum64())))
+}
+
+var globalRng *rand.Rand = GetRandomizer()
+
+// The Chrome version generator will suffer from deviation of a normal distribution.
+func ChromeVersion() int {
+	// Start from Chrome 144, released on 2026.1.13.
+	var startVersion int = 144
+	var timeStart int64 = time.Date(2026, 1, 13, 0, 0, 0, 0, time.UTC).Unix() / 86400
+	var timeCurrent int64 = time.Now().Unix() / 86400
+	var timeDiff int = int((timeCurrent - timeStart - 35)) - int(math.Floor(math.Pow(globalRng.Float64(), 2)*105))
+	return startVersion + (timeDiff / 35) // It's 31.15 currently.
+}
+
+var safariMinorMap [25]int = [25]int{0, 0, 0, 1, 1,
+	1, 2, 2, 2, 2, 3, 3, 3, 4, 4,
+	4, 5, 5, 5, 5, 5, 6, 6, 6, 6}
+
+// The following version generators use deterministic generators, but with the distribution scaled by a curve.
+func CurlVersion() string {
+	// curl 8.0.0 was released on 20/03/2023.
+	var timeCurrent int64 = time.Now().Unix() / 86400
+	var timeStart int64 = time.Date(2023, 3, 20, 0, 0, 0, 0, time.UTC).Unix() / 86400
+	var timeDiff int = int((timeCurrent - timeStart - 60)) - int(math.Floor(math.Pow(globalRng.Float64(), 2)*165))
+	var minorValue int = int(timeDiff / 57) // The release cadence is actually 56.67 days.
+	return "8." + strconv.Itoa(minorValue) + ".0"
+}
+func FirefoxVersion() int {
+	// Firefox 128 ESR was released on 09/07/2023.
+	var timeCurrent int64 = time.Now().Unix() / 86400
+	var timeStart int64 = time.Date(2024, 7, 29, 0, 0, 0, 0, time.UTC).Unix() / 86400
+	var timeDiff = timeCurrent - timeStart - 25 - int64(math.Floor(math.Pow(globalRng.Float64(), 2)*50))
+	return int(timeDiff/30) + 128
+}
+func SafariVersion() string {
+	var anchoredTime time.Time = time.Now()
+	var releaseYear int = anchoredTime.Year()
+	var splitPoint time.Time = time.Date(releaseYear, 9, 23, 0, 0, 0, 0, time.UTC)
+	var delayedDays = int(math.Floor(math.Pow(globalRng.Float64(), 3) * 75))
+	splitPoint = splitPoint.AddDate(0, 0, delayedDays)
+	if anchoredTime.Compare(splitPoint) < 0 {
+		releaseYear--
+		splitPoint = time.Date(releaseYear, 9, 23, 0, 0, 0, 0, time.UTC)
+		splitPoint = splitPoint.AddDate(0, 0, delayedDays)
+	}
+	var minorVersion = safariMinorMap[(anchoredTime.Unix()-splitPoint.Unix())/1296000]
+	return strconv.Itoa(releaseYear-1999) + "." + strconv.Itoa(minorVersion)
+}
+
+// The full Chromium brand GREASE implementation
+var clientHintGreaseNA = []string{" ", "(", ":", "-", ".", "/", ")", ";", "=", "?", "_"}
+var clientHintVersionNA = []string{"8", "99", "24"}
+var clientHintShuffle3 = [][3]int{{0, 1, 2}, {0, 2, 1}, {1, 0, 2}, {1, 2, 0}, {2, 0, 1}, {2, 1, 0}}
+var clientHintShuffle4 = [][4]int{
+	{0, 1, 2, 3}, {0, 1, 3, 2}, {0, 2, 1, 3}, {0, 2, 3, 1}, {0, 3, 1, 2}, {0, 3, 2, 1},
+	{1, 0, 2, 3}, {1, 0, 3, 2}, {1, 2, 0, 3}, {1, 2, 3, 0}, {1, 3, 0, 2}, {1, 3, 2, 0},
+	{2, 0, 1, 3}, {2, 0, 3, 1}, {2, 1, 0, 3}, {2, 1, 3, 0}, {2, 3, 0, 1}, {2, 3, 1, 0},
+	{3, 0, 1, 2}, {3, 0, 2, 1}, {3, 1, 0, 2}, {3, 1, 2, 0}, {3, 2, 0, 1}, {3, 2, 1, 0}}
+
+func getGreasedChInvalidBrand(seed int) string {
+	return "\"Not" + clientHintGreaseNA[seed%len(clientHintGreaseNA)] + "A" + clientHintGreaseNA[(seed+1)%len(clientHintGreaseNA)] + "Brand\";v=\"" + clientHintVersionNA[seed%len(clientHintVersionNA)] + "\""
+}
+func getGreasedChOrder(brandLength int, seed int) []int {
+	switch brandLength {
+	case 1:
+		return []int{0}
+	case 2:
+		return []int{seed % brandLength, (seed + 1) % brandLength}
+	case 3:
+		return clientHintShuffle3[seed%len(clientHintShuffle3)][:]
+	default:
+		return clientHintShuffle4[seed%len(clientHintShuffle4)][:]
+	}
+	//return []int{}
+}
+func getUngreasedChUa(majorVersion int, forkName string) []string {
+	// Set the capacity to 4, the maximum allowed brand size, so Go will never allocate memory twice
+	baseChUa := make([]string, 0, 4)
+	baseChUa = append(baseChUa, getGreasedChInvalidBrand(majorVersion),
+		"\"Chromium\";v=\""+strconv.Itoa(majorVersion)+"\"")
+	switch forkName {
+	case "chrome":
+		baseChUa = append(baseChUa, "\"Google Chrome\";v=\""+strconv.Itoa(majorVersion)+"\"")
+	case "edge":
+		baseChUa = append(baseChUa, "\"Microsoft Edge\";v=\""+strconv.Itoa(majorVersion)+"\"")
+	}
+	return baseChUa
+}
+func getGreasedChUa(majorVersion int, forkName string) string {
+	ungreasedCh := getUngreasedChUa(majorVersion, forkName)
+	shuffleMap := getGreasedChOrder(len(ungreasedCh), majorVersion)
+	shuffledCh := make([]string, len(ungreasedCh))
+	for i, e := range shuffleMap {
+		shuffledCh[e] = ungreasedCh[i]
+	}
+	return strings.Join(shuffledCh, ", ")
+}
+
+// The code below provides a coherent default browser user agent string based on a CPU-seeded PRNG.
+var CurlUA = "curl/" + CurlVersion()
+var AnchoredFirefoxVersion = strconv.Itoa(FirefoxVersion())
+var FirefoxUA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:" + AnchoredFirefoxVersion + ".0) Gecko/20100101 Firefox/" + AnchoredFirefoxVersion + ".0"
+var SafariUA = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/" + SafariVersion() + " Safari/605.1.15"
+
+// Chromium browsers.
+var AnchoredChromeVersion = ChromeVersion()
+var ChromeUA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/" + strconv.Itoa(AnchoredChromeVersion) + ".0.0.0 Safari/537.36"
+var ChromeUACH = getGreasedChUa(AnchoredChromeVersion, "chrome")
+var MSEdgeUA = ChromeUA + "Edg/" + strconv.Itoa(AnchoredChromeVersion) + ".0.0.0"
+var MSEdgeUACH = getGreasedChUa(AnchoredChromeVersion, "edge")
+
+func applyMasqueradedHeaders(header http.Header, browser string, variant string) {
+	// Browser-specific.
+	switch browser {
+	case "chrome":
+		header["Sec-CH-UA"] = []string{ChromeUACH}
+		header["Sec-CH-UA-Mobile"] = []string{"?0"}
+		header["Sec-CH-UA-Platform"] = []string{"\"Windows\""}
+		header["DNT"] = []string{"1"}
+		header.Set("User-Agent", ChromeUA)
+		header.Set("Accept-Language", "en-US,en;q=0.9")
+	case "edge":
+		header["Sec-CH-UA"] = []string{MSEdgeUACH}
+		header["Sec-CH-UA-Mobile"] = []string{"?0"}
+		header["Sec-CH-UA-Platform"] = []string{"\"Windows\""}
+		header["DNT"] = []string{"1"}
+		header.Set("User-Agent", MSEdgeUA)
+		header.Set("Accept-Language", "en-US,en;q=0.9")
+	case "firefox":
+		header.Set("User-Agent", FirefoxUA)
+		header["DNT"] = []string{"1"}
+		header.Set("Accept-Language", "en-US,en;q=0.5")
+	case "safari":
+		header.Set("User-Agent", SafariUA)
+		header.Set("Accept-Language", "en-US,en;q=0.9")
+	case "golang":
+		// Expose the default net/http header.
+		header.Del("User-Agent")
+		return
+	case "curl":
+		header.Set("User-Agent", CurlUA)
+		return
+	}
+	// Context-specific.
+	switch variant {
+	case "nav":
+		if header.Get("Cache-Control") == "" {
+			switch browser {
+			case "chrome", "edge":
+				header.Set("Cache-Control", "max-age=0")
+			}
+		}
+		header.Set("Upgrade-Insecure-Requests", "1")
+		if header.Get("Accept") == "" {
+			switch browser {
+			case "chrome", "edge":
+				header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/jxl,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7")
+			case "firefox", "safari":
+				header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
+			}
+		}
+		header.Set("Sec-Fetch-Site", "none")
+		header.Set("Sec-Fetch-Mode", "navigate")
+		switch browser {
+		case "safari":
+		default:
+			header.Set("Sec-Fetch-User", "?1")
+		}
+		header.Set("Sec-Fetch-Dest", "document")
+		header.Set("Priority", "u=0, i")
+	case "ws":
+		header.Set("Sec-Fetch-Mode", "websocket")
+		switch browser {
+		case "safari":
+			// Safari is NOT web-compliant here!
+			header.Set("Sec-Fetch-Dest", "websocket")
+		default:
+			header.Set("Sec-Fetch-Dest", "empty")
+		}
+		header.Set("Sec-Fetch-Site", "same-origin")
+		if header.Get("Cache-Control") == "" {
+			header.Set("Cache-Control", "no-cache")
+		}
+		if header.Get("Pragma") == "" {
+			header.Set("Pragma", "no-cache")
+		}
+		if header.Get("Accept") == "" {
+			header.Set("Accept", "*/*")
+		}
+	case "fetch":
+		header.Set("Sec-Fetch-Mode", "cors")
+		header.Set("Sec-Fetch-Dest", "empty")
+		header.Set("Sec-Fetch-Site", "same-origin")
+		if header.Get("Priority") == "" {
+			switch browser {
+			case "chrome", "edge":
+				header.Set("Priority", "u=1, i")
+			case "firefox":
+				header.Set("Priority", "u=4")
+			case "safari":
+				header.Set("Priority", "u=3, i")
+			}
+		}
+		if header.Get("Cache-Control") == "" {
+			header.Set("Cache-Control", "no-cache")
+		}
+		if header.Get("Pragma") == "" {
+			header.Set("Pragma", "no-cache")
+		}
+		if header.Get("Accept") == "" {
+			header.Set("Accept", "*/*")
+		}
+	}
+}
+
+func TryDefaultHeadersWith(header http.Header, variant string) {
+	// The global UA special value handler for transports. Used to be called HandleTransportUASettings.
+	// Just a FYI to whoever needing to fix this piece of code after some spontaneous event, I tried to make the two methods separate to let the code be cleaner and more organized.
+	if len(header.Values("User-Agent")) < 1 {
+		applyMasqueradedHeaders(header, "chrome", variant)
+	} else {
+		switch header.Get("User-Agent") {
+		case "chrome":
+			applyMasqueradedHeaders(header, "chrome", variant)
+		case "firefox":
+			applyMasqueradedHeaders(header, "firefox", variant)
+		case "safari":
+			applyMasqueradedHeaders(header, "safari", variant)
+		case "edge":
+			applyMasqueradedHeaders(header, "edge", variant)
+		case "curl":
+			applyMasqueradedHeaders(header, "curl", variant)
+		case "golang":
+			applyMasqueradedHeaders(header, "golang", variant)
+		}
+	}
+}

common/xray/utils/padding.go

@@ -0,0 +1,24 @@
+package utils
+
+import (
+	"math/rand/v2"
+)
+
+var (
+	// 8 ÷ (397/62)
+	h2packCorrectionFactor = 1.2493702770780857
+	base62TotalCharsNum    = 62
+	base62Chars            = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+)
+
+// H2Base62Pad generates a base62 padding string for HTTP/2 header
+// The total len will be slightly longer than the input to match the length after h2(h3 also) header huffman encoding
+func H2Base62Pad[T int32 | int64 | int](expectedLen T) string {
+	actualLenFloat := float64(expectedLen) * h2packCorrectionFactor
+	actualLen := int(actualLenFloat)
+	result := make([]byte, actualLen)
+	for i := range actualLen {
+		result[i] = base62Chars[rand.N(base62TotalCharsNum)]
+	}
+	return string(result)
+}

common/xray/uuid/uuid.go

@@ -0,0 +1,105 @@
+package uuid
+
+import (
+	"bytes"
+	"crypto/rand"
+	"crypto/sha1"
+	"encoding/hex"
+
+	"github.com/sagernet/sing-box/common/xray"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+var byteGroups = []int{8, 4, 4, 4, 12}
+
+type UUID [16]byte
+
+// String returns the string representation of this UUID.
+func (u *UUID) String() string {
+	bytes := u.Bytes()
+	result := hex.EncodeToString(bytes[0 : byteGroups[0]/2])
+	start := byteGroups[0] / 2
+	for i := 1; i < len(byteGroups); i++ {
+		nBytes := byteGroups[i] / 2
+		result += "-"
+		result += hex.EncodeToString(bytes[start : start+nBytes])
+		start += nBytes
+	}
+	return result
+}
+
+// Bytes returns the bytes representation of this UUID.
+func (u *UUID) Bytes() []byte {
+	return u[:]
+}
+
+// Equals returns true if this UUID equals another UUID by value.
+func (u *UUID) Equals(another *UUID) bool {
+	if u == nil && another == nil {
+		return true
+	}
+	if u == nil || another == nil {
+		return false
+	}
+	return bytes.Equal(u.Bytes(), another.Bytes())
+}
+
+// New creates a UUID with random value.
+func New() UUID {
+	var uuid UUID
+	common.Must2(rand.Read(uuid.Bytes()))
+	uuid[6] = (uuid[6] & 0x0f) | (4 << 4)
+	uuid[8] = (uuid[8]&(0xff>>2) | (0x02 << 6))
+	return uuid
+}
+
+// ParseBytes converts a UUID in byte form to object.
+func ParseBytes(b []byte) (UUID, error) {
+	var uuid UUID
+	if len(b) != 16 {
+		return uuid, E.New("invalid UUID: ", b)
+	}
+	copy(uuid[:], b)
+	return uuid, nil
+}
+
+// ParseString converts a UUID in string form to object.
+func ParseString(str string) (UUID, error) {
+	var uuid UUID
+
+	text := []byte(str)
+	if l := len(text); l < 32 || l > 36 {
+		if l == 0 || l > 30 {
+			return uuid, E.New("invalid UUID: ", str)
+		}
+		h := sha1.New()
+		h.Write(uuid[:])
+		h.Write(text)
+		u := h.Sum(nil)[:16]
+		u[6] = (u[6] & 0x0f) | (5 << 4)
+		u[8] = (u[8]&(0xff>>2) | (0x02 << 6))
+		copy(uuid[:], u)
+		return uuid, nil
+	}
+
+	b := uuid.Bytes()
+
+	for _, byteGroup := range byteGroups {
+		if len(text) > 0 && text[0] == '-' {
+			text = text[1:]
+		}
+
+		if len(text) < byteGroup {
+			return uuid, E.New("invalid UUID: ", str)
+		}
+
+		if _, err := hex.Decode(b[:byteGroup/2], text[:byteGroup]); err != nil {
+			return uuid, err
+		}
+
+		text = text[byteGroup:]
+		b = b[byteGroup/2:]
+	}
+
+	return uuid, nil
+}

constant/dns.go

@@ -28,6 +28,8 @@ const (
 	DNSTypeFakeIP      = "fakeip"
 	DNSTypeDHCP        = "dhcp"
 	DNSTypeTailscale   = "tailscale"
+	DNSTypeSDNS        = "sdns"
+	DNSTypeFallback    = "fallback"
 )
 
 const (

constant/manager_api.go

@@ -0,0 +1,9 @@
+package constant
+
+const (
+	ManagerAPIServer = "server"
+	ManagerAPIClient = "client"
+
+	ManagerAPIProtocolHTTP = "http"
+	ManagerAPIProtocolGrpc = "grpc"
+)

constant/node_manager_api.go

@@ -0,0 +1,6 @@
+package constant
+
+const (
+	NodeManagerAPIServer = "server"
+	NodeManagerAPIClient = "client"
+)

constant/provider.go

@@ -0,0 +1,20 @@
+package constant
+
+const (
+	ProviderTypeInline = "inline"
+	ProviderTypeLocal  = "local"
+	ProviderTypeRemote = "remote"
+)
+
+func ProviderDisplayName(providerType string) string {
+	switch providerType {
+	case ProviderTypeInline:
+		return "Inline"
+	case ProviderTypeLocal:
+		return "Local"
+	case ProviderTypeRemote:
+		return "Remote"
+	default:
+		return "Unknown"
+	}
+}

constant/proxy.go

@@ -1,39 +1,59 @@
 package constant
 
 const (
-	TypeTun          = "tun"
-	TypeRedirect     = "redirect"
-	TypeTProxy       = "tproxy"
-	TypeDirect       = "direct"
-	TypeBlock        = "block"
-	TypeDNS          = "dns"
-	TypeSOCKS        = "socks"
-	TypeHTTP         = "http"
-	TypeMixed        = "mixed"
-	TypeShadowsocks  = "shadowsocks"
-	TypeVMess        = "vmess"
-	TypeTrojan       = "trojan"
-	TypeNaive        = "naive"
-	TypeWireGuard    = "wireguard"
-	TypeHysteria     = "hysteria"
-	TypeTor          = "tor"
-	TypeSSH          = "ssh"
-	TypeShadowTLS    = "shadowtls"
-	TypeAnyTLS       = "anytls"
-	TypeShadowsocksR = "shadowsocksr"
-	TypeVLESS        = "vless"
-	TypeTUIC         = "tuic"
-	TypeHysteria2    = "hysteria2"
-	TypeTailscale    = "tailscale"
-	TypeDERP         = "derp"
-	TypeResolved     = "resolved"
-	TypeSSMAPI       = "ssm-api"
-	TypeCCM          = "ccm"
-	TypeOCM          = "ocm"
-	TypeOOMKiller    = "oom-killer"
+	TypeTun               = "tun"
+	TypeRedirect          = "redirect"
+	TypeTProxy            = "tproxy"
+	TypeDirect            = "direct"
+	TypeBlock             = "block"
+	TypeDNS               = "dns"
+	TypeSOCKS             = "socks"
+	TypeHTTP              = "http"
+	TypeMixed             = "mixed"
+	TypeShadowsocks       = "shadowsocks"
+	TypeVMess             = "vmess"
+	TypeTrojan            = "trojan"
+	TypeNaive             = "naive"
+	TypeWireGuard         = "wireguard"
+	TypeWARP              = "warp"
+	TypeMASQUE            = "masque"
+	TypeMTProxy           = "mtproxy"
+	TypeParser            = "parser"
+	TypeHysteria          = "hysteria"
+	TypeTor               = "tor"
+	TypeSSH               = "ssh"
+	TypeShadowTLS         = "shadowtls"
+	TypeMieru             = "mieru"
+	TypeAnyTLS            = "anytls"
+	TypeShadowsocksR      = "shadowsocksr"
+	TypeVLESS             = "vless"
+	TypeTUIC              = "tuic"
+	TypeHysteria2         = "hysteria2"
+	TypeBond              = "bond"
+	TypeFailover          = "failover"
+	TypeVPNServer         = "vpn-server"
+	TypeVPNClient         = "vpn-client"
+	TypeTailscale         = "tailscale"
+	TypeConnectionLimiter = "connection-limiter"
+	TypeBandwidthLimiter  = "bandwidth-limiter"
+	TypeTrafficLimiter    = "traffic-limiter"
+	TypeRateLimiter       = "rate-limiter"
+	TypeAdminPanel        = "admin-panel"
+	TypeManagerAPI        = "manager-api"
+	TypeNodeManagerAPI    = "node-manager-api"
+	TypeDERP              = "derp"
+	TypeManager           = "manager"
+	TypeNode              = "node"
+	TypeResolved          = "resolved"
+	TypeSSMAPI            = "ssm-api"
+	TypeCCM               = "ccm"
+	TypeOCM               = "ocm"
+	TypeOOMKiller         = "oom-killer"
+	TypeProfiler          = "profiler"
 )
 
 const (
+	TypeFallback = "fallback"
 	TypeSelector = "selector"
 	TypeURLTest  = "urltest"
 )
@@ -68,6 +88,14 @@ func ProxyDisplayName(proxyType string) string {
 		return "Naive"
 	case TypeWireGuard:
 		return "WireGuard"
+	case TypeWARP:
+		return "WARP"
+	case TypeMASQUE:
+		return "MASQUE"
+	case TypeMTProxy:
+		return "MTProxy"
+	case TypeParser:
+		return "Parser"
 	case TypeHysteria:
 		return "Hysteria"
 	case TypeTor:
@@ -84,14 +112,36 @@ func ProxyDisplayName(proxyType string) string {
 		return "TUIC"
 	case TypeHysteria2:
 		return "Hysteria2"
+	case TypeBond:
+		return "Bond"
+	case TypeFailover:
+		return "Failover"
+	case TypeMieru:
+		return "Mieru"
 	case TypeAnyTLS:
 		return "AnyTLS"
+	case TypeFallback:
+		return "Fallback"
 	case TypeTailscale:
 		return "Tailscale"
 	case TypeSelector:
 		return "Selector"
 	case TypeURLTest:
 		return "URLTest"
+	case TypeConnectionLimiter:
+		return "Connection Limiter"
+	case TypeBandwidthLimiter:
+		return "Bandwidth Limiter"
+	case TypeTrafficLimiter:
+		return "Traffic Limiter"
+	case TypeRateLimiter:
+		return "Rate Limiter"
+	case TypeVPNClient:
+		return "VPN Client"
+	case TypeVPNServer:
+		return "VPN Server"
+	case TypeProfiler:
+		return "Profiler"
 	default:
 		return "Unknown"
 	}

constant/v2ray.go

@@ -6,4 +6,6 @@ const (
 	V2RayTransportTypeQUIC        = "quic"
 	V2RayTransportTypeGRPC        = "grpc"
 	V2RayTransportTypeHTTPUpgrade = "httpupgrade"
+	V2RayTransportTypeXHTTP       = "xhttp"
+	V2RayTransportTypeKCP         = "mkcp"
 )

daemon/instance.go

@@ -98,11 +98,6 @@ func (s *StartedService) newInstance(profileContent string, overrideOptions *Ove
 	}
 	urlTestHistoryStorage := urltest.NewHistoryStorage()
 	ctx = service.ContextWithPtr(ctx, urlTestHistoryStorage)
-	i := &Instance{
-		ctx:                   ctx,
-		cancel:                cancel,
-		urlTestHistoryStorage: urlTestHistoryStorage,
-	}
 	boxInstance, err := box.New(box.Options{
 		Context:           ctx,
 		Options:           options,
@@ -112,6 +107,15 @@ func (s *StartedService) newInstance(profileContent string, overrideOptions *Ove
 		cancel()
 		return nil, err
 	}
+	experimentalOptions := common.PtrValueOrDefault(options.Experimental)
+	if experimentalOptions.UnifiedDelay != nil && experimentalOptions.UnifiedDelay.Enabled {
+		ctx = urltest.ContextWithIsUnifiedDelay(ctx)
+	}
+	i := &Instance{
+		ctx:                   ctx,
+		cancel:                cancel,
+		urlTestHistoryStorage: urlTestHistoryStorage,
+	}
 	i.instance = boxInstance
 	i.connectionManager = service.FromContext[adapter.ConnectionManager](ctx)
 	i.clashServer = service.FromContext[adapter.ClashServer](ctx)

daemon/started_service.pb.go

@@ -1,13 +1,12 @@
 package daemon
 
 import (
-	reflect "reflect"
-	sync "sync"
-	unsafe "unsafe"
-
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	emptypb "google.golang.org/protobuf/types/known/emptypb"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
 )
 
 const (
@@ -1948,43 +1947,40 @@ func file_daemon_started_service_proto_rawDescGZIP() []byte {
 	return file_daemon_started_service_proto_rawDescData
 }
 
-var (
-	file_daemon_started_service_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
-	file_daemon_started_service_proto_msgTypes  = make([]protoimpl.MessageInfo, 26)
-	file_daemon_started_service_proto_goTypes   = []any{
-		(LogLevel)(0),                        // 0: daemon.LogLevel
-		(ConnectionEventType)(0),             // 1: daemon.ConnectionEventType
-		(ServiceStatus_Type)(0),              // 2: daemon.ServiceStatus.Type
-		(*ServiceStatus)(nil),                // 3: daemon.ServiceStatus
-		(*ReloadServiceRequest)(nil),         // 4: daemon.ReloadServiceRequest
-		(*SubscribeStatusRequest)(nil),       // 5: daemon.SubscribeStatusRequest
-		(*Log)(nil),                          // 6: daemon.Log
-		(*DefaultLogLevel)(nil),              // 7: daemon.DefaultLogLevel
-		(*Status)(nil),                       // 8: daemon.Status
-		(*Groups)(nil),                       // 9: daemon.Groups
-		(*Group)(nil),                        // 10: daemon.Group
-		(*GroupItem)(nil),                    // 11: daemon.GroupItem
-		(*URLTestRequest)(nil),               // 12: daemon.URLTestRequest
-		(*SelectOutboundRequest)(nil),        // 13: daemon.SelectOutboundRequest
-		(*SetGroupExpandRequest)(nil),        // 14: daemon.SetGroupExpandRequest
-		(*ClashMode)(nil),                    // 15: daemon.ClashMode
-		(*ClashModeStatus)(nil),              // 16: daemon.ClashModeStatus
-		(*SystemProxyStatus)(nil),            // 17: daemon.SystemProxyStatus
-		(*SetSystemProxyEnabledRequest)(nil), // 18: daemon.SetSystemProxyEnabledRequest
-		(*SubscribeConnectionsRequest)(nil),  // 19: daemon.SubscribeConnectionsRequest
-		(*ConnectionEvent)(nil),              // 20: daemon.ConnectionEvent
-		(*ConnectionEvents)(nil),             // 21: daemon.ConnectionEvents
-		(*Connection)(nil),                   // 22: daemon.Connection
-		(*ProcessInfo)(nil),                  // 23: daemon.ProcessInfo
-		(*CloseConnectionRequest)(nil),       // 24: daemon.CloseConnectionRequest
-		(*DeprecatedWarnings)(nil),           // 25: daemon.DeprecatedWarnings
-		(*DeprecatedWarning)(nil),            // 26: daemon.DeprecatedWarning
-		(*StartedAt)(nil),                    // 27: daemon.StartedAt
-		(*Log_Message)(nil),                  // 28: daemon.Log.Message
-		(*emptypb.Empty)(nil),                // 29: google.protobuf.Empty
-	}
-)
-
+var file_daemon_started_service_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
+var file_daemon_started_service_proto_msgTypes = make([]protoimpl.MessageInfo, 26)
+var file_daemon_started_service_proto_goTypes = []any{
+	(LogLevel)(0),                        // 0: daemon.LogLevel
+	(ConnectionEventType)(0),             // 1: daemon.ConnectionEventType
+	(ServiceStatus_Type)(0),              // 2: daemon.ServiceStatus.Type
+	(*ServiceStatus)(nil),                // 3: daemon.ServiceStatus
+	(*ReloadServiceRequest)(nil),         // 4: daemon.ReloadServiceRequest
+	(*SubscribeStatusRequest)(nil),       // 5: daemon.SubscribeStatusRequest
+	(*Log)(nil),                          // 6: daemon.Log
+	(*DefaultLogLevel)(nil),              // 7: daemon.DefaultLogLevel
+	(*Status)(nil),                       // 8: daemon.Status
+	(*Groups)(nil),                       // 9: daemon.Groups
+	(*Group)(nil),                        // 10: daemon.Group
+	(*GroupItem)(nil),                    // 11: daemon.GroupItem
+	(*URLTestRequest)(nil),               // 12: daemon.URLTestRequest
+	(*SelectOutboundRequest)(nil),        // 13: daemon.SelectOutboundRequest
+	(*SetGroupExpandRequest)(nil),        // 14: daemon.SetGroupExpandRequest
+	(*ClashMode)(nil),                    // 15: daemon.ClashMode
+	(*ClashModeStatus)(nil),              // 16: daemon.ClashModeStatus
+	(*SystemProxyStatus)(nil),            // 17: daemon.SystemProxyStatus
+	(*SetSystemProxyEnabledRequest)(nil), // 18: daemon.SetSystemProxyEnabledRequest
+	(*SubscribeConnectionsRequest)(nil),  // 19: daemon.SubscribeConnectionsRequest
+	(*ConnectionEvent)(nil),              // 20: daemon.ConnectionEvent
+	(*ConnectionEvents)(nil),             // 21: daemon.ConnectionEvents
+	(*Connection)(nil),                   // 22: daemon.Connection
+	(*ProcessInfo)(nil),                  // 23: daemon.ProcessInfo
+	(*CloseConnectionRequest)(nil),       // 24: daemon.CloseConnectionRequest
+	(*DeprecatedWarnings)(nil),           // 25: daemon.DeprecatedWarnings
+	(*DeprecatedWarning)(nil),            // 26: daemon.DeprecatedWarning
+	(*StartedAt)(nil),                    // 27: daemon.StartedAt
+	(*Log_Message)(nil),                  // 28: daemon.Log.Message
+	(*emptypb.Empty)(nil),                // 29: google.protobuf.Empty
+}
 var file_daemon_started_service_proto_depIdxs = []int32{
 	2,  // 0: daemon.ServiceStatus.status:type_name -> daemon.ServiceStatus.Type
 	28, // 1: daemon.Log.messages:type_name -> daemon.Log.Message

daemon/started_service_grpc.pb.go

@@ -2,7 +2,6 @@ package daemon
 
 import (
 	context "context"
-
 	grpc "google.golang.org/grpc"
 	codes "google.golang.org/grpc/codes"
 	status "google.golang.org/grpc/status"
@@ -375,83 +374,63 @@ type UnimplementedStartedServiceServer struct{}
 func (UnimplementedStartedServiceServer) StopService(context.Context, *emptypb.Empty) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method StopService not implemented")
 }
-
 func (UnimplementedStartedServiceServer) ReloadService(context.Context, *emptypb.Empty) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method ReloadService not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SubscribeServiceStatus(*emptypb.Empty, grpc.ServerStreamingServer[ServiceStatus]) error {
 	return status.Error(codes.Unimplemented, "method SubscribeServiceStatus not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SubscribeLog(*emptypb.Empty, grpc.ServerStreamingServer[Log]) error {
 	return status.Error(codes.Unimplemented, "method SubscribeLog not implemented")
 }
-
 func (UnimplementedStartedServiceServer) GetDefaultLogLevel(context.Context, *emptypb.Empty) (*DefaultLogLevel, error) {
 	return nil, status.Error(codes.Unimplemented, "method GetDefaultLogLevel not implemented")
 }
-
 func (UnimplementedStartedServiceServer) ClearLogs(context.Context, *emptypb.Empty) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method ClearLogs not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SubscribeStatus(*SubscribeStatusRequest, grpc.ServerStreamingServer[Status]) error {
 	return status.Error(codes.Unimplemented, "method SubscribeStatus not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SubscribeGroups(*emptypb.Empty, grpc.ServerStreamingServer[Groups]) error {
 	return status.Error(codes.Unimplemented, "method SubscribeGroups not implemented")
 }
-
 func (UnimplementedStartedServiceServer) GetClashModeStatus(context.Context, *emptypb.Empty) (*ClashModeStatus, error) {
 	return nil, status.Error(codes.Unimplemented, "method GetClashModeStatus not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SubscribeClashMode(*emptypb.Empty, grpc.ServerStreamingServer[ClashMode]) error {
 	return status.Error(codes.Unimplemented, "method SubscribeClashMode not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SetClashMode(context.Context, *ClashMode) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method SetClashMode not implemented")
 }
-
 func (UnimplementedStartedServiceServer) URLTest(context.Context, *URLTestRequest) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method URLTest not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SelectOutbound(context.Context, *SelectOutboundRequest) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method SelectOutbound not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SetGroupExpand(context.Context, *SetGroupExpandRequest) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method SetGroupExpand not implemented")
 }
-
 func (UnimplementedStartedServiceServer) GetSystemProxyStatus(context.Context, *emptypb.Empty) (*SystemProxyStatus, error) {
 	return nil, status.Error(codes.Unimplemented, "method GetSystemProxyStatus not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SetSystemProxyEnabled(context.Context, *SetSystemProxyEnabledRequest) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method SetSystemProxyEnabled not implemented")
 }
-
 func (UnimplementedStartedServiceServer) SubscribeConnections(*SubscribeConnectionsRequest, grpc.ServerStreamingServer[ConnectionEvents]) error {
 	return status.Error(codes.Unimplemented, "method SubscribeConnections not implemented")
 }
-
 func (UnimplementedStartedServiceServer) CloseConnection(context.Context, *CloseConnectionRequest) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method CloseConnection not implemented")
 }
-
 func (UnimplementedStartedServiceServer) CloseAllConnections(context.Context, *emptypb.Empty) (*emptypb.Empty, error) {
 	return nil, status.Error(codes.Unimplemented, "method CloseAllConnections not implemented")
 }
-
 func (UnimplementedStartedServiceServer) GetDeprecatedWarnings(context.Context, *emptypb.Empty) (*DeprecatedWarnings, error) {
 	return nil, status.Error(codes.Unimplemented, "method GetDeprecatedWarnings not implemented")
 }
-
 func (UnimplementedStartedServiceServer) GetStartedAt(context.Context, *emptypb.Empty) (*StartedAt, error) {
 	return nil, status.Error(codes.Unimplemented, "method GetStartedAt not implemented")
 }

dns/transport/fallback/fallback.go

@@ -0,0 +1,72 @@
+package fallback
+
+import (
+	"context"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	"github.com/sagernet/sing/service"
+
+	mDNS "github.com/miekg/dns"
+)
+
+func RegisterTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.FallbackDNSServerOptions](registry, C.DNSTypeFallback, NewTransport)
+}
+
+var _ adapter.DNSTransport = (*Transport)(nil)
+
+type Transport struct {
+	dns.TransportAdapter
+	ctx      context.Context
+	manager  adapter.DNSTransportManager
+	logger   logger.ContextLogger
+	tags     []string
+	strategy ExchangeStrategy
+}
+
+func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.FallbackDNSServerOptions) (adapter.DNSTransport, error) {
+	if len(options.Servers) == 0 {
+		return nil, E.New("missing servers")
+	}
+	manager := service.FromContext[adapter.DNSTransportManager](ctx)
+	servers := make([]adapter.DNSTransport, len(options.Servers))
+	for i, tag := range options.Servers {
+		server, loaded := manager.Transport(tag)
+		if !loaded {
+			return nil, E.New("server ", tag, " not found")
+		}
+		servers[i] = server
+	}
+	strategy, err := CreateStrategy(options.Strategy, servers, logger)
+	if err != nil {
+		return nil, err
+	}
+	return &Transport{
+		TransportAdapter: dns.NewTransportAdapter(C.DNSTypeFallback, tag, options.Servers),
+		ctx:              ctx,
+		logger:           logger,
+		tags:             options.Servers,
+		strategy:         strategy,
+	}, nil
+}
+
+func (t *Transport) Start(stage adapter.StartStage) error {
+	return nil
+}
+
+func (t *Transport) Close() error {
+	return nil
+}
+
+func (t *Transport) Reset() {
+}
+
+func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	return t.strategy(ctx, message)
+}

dns/transport/fallback/strategy.go

@@ -0,0 +1,73 @@
+package fallback
+
+import (
+	"context"
+
+	mDNS "github.com/miekg/dns"
+	"github.com/sagernet/sing-box/adapter"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+)
+
+type ExchangeStrategy = func(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error)
+
+func parallelStrategy(servers []adapter.DNSTransport, logger logger.ContextLogger) ExchangeStrategy {
+	return func(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+		queryCtx, cancel := context.WithCancel(ctx)
+		defer cancel()
+		type result struct {
+			response *mDNS.Msg
+			err      error
+		}
+		results := make(chan result)
+		for _, server := range servers {
+			go func() {
+				response, err := server.Exchange(queryCtx, message)
+				select {
+				case results <- result{response, err}:
+				case <-queryCtx.Done():
+				}
+			}()
+		}
+		var lastErr error
+		for range servers {
+			select {
+			case result := <-results:
+				if result.err != nil {
+					lastErr = result.err
+					continue
+				}
+				return result.response, nil
+			case <-ctx.Done():
+				return nil, ctx.Err()
+			}
+		}
+		return nil, lastErr
+	}
+}
+
+func sequentialStrategy(servers []adapter.DNSTransport, logger logger.ContextLogger) ExchangeStrategy {
+	return func(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+		var lastErr error
+		for _, server := range servers {
+			response, err := server.Exchange(ctx, message)
+			if err != nil {
+				lastErr = err
+				continue
+			}
+			return response, nil
+		}
+		return nil, lastErr
+	}
+}
+
+func CreateStrategy(strategy string, servers []adapter.DNSTransport, logger logger.ContextLogger) (ExchangeStrategy, error) {
+	switch strategy {
+	case "parallel":
+		return parallelStrategy(servers, logger), nil
+	case "", "sequential":
+		return sequentialStrategy(servers, logger), nil
+	default:
+		return nil, E.New("strategy not found: ", strategy)
+	}
+}

dns/transport/sdns.go

@@ -0,0 +1,73 @@
+package transport
+
+import (
+	"context"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/ameshkov/dnscrypt/v2"
+	mDNS "github.com/miekg/dns"
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+var _ adapter.DNSTransport = (*SDNSTransport)(nil)
+
+func RegisterSDNS(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.SDNSDNSServerOptions](registry, C.DNSTypeSDNS, NewSDNSTransport)
+}
+
+type SDNSTransport struct {
+	dns.TransportAdapter
+	client *dnscrypt.Client
+	name   string
+	stamp  string
+
+	mtx sync.Mutex
+}
+
+func NewSDNSTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.SDNSDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewRemoteDialer(ctx, options.RemoteDNSServerOptions)
+	if err != nil {
+		return nil, err
+	}
+	return &SDNSTransport{
+		client: &dnscrypt.Client{
+			Net:     "udp",
+			Timeout: 10 * time.Second,
+			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				return transportDialer.DialContext(ctx, N.NetworkName(network), M.ParseSocksaddr(addr))
+			},
+		},
+		stamp: options.Stamp,
+	}, err
+}
+
+func (t *SDNSTransport) Name() string {
+	return t.name
+}
+
+func (t *SDNSTransport) Start(adapter.StartStage) error {
+	return nil
+}
+
+func (t *SDNSTransport) Close() error {
+	return nil
+}
+
+func (t *SDNSTransport) Reset() {
+}
+
+func (t *SDNSTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	resolverInfo, err := t.client.Dial(t.stamp)
+	if err != nil {
+		return nil, err
+	}
+	return t.client.Exchange(message, resolverInfo)
+}

docs/configuration/inbound/tun.zh.md

@@ -586,3 +586,4 @@ TCP/IP 栈。
 ### 监听字段
 
 参阅 [监听字段](/zh/configuration/shared/listen/)。
+ 

docs/configuration/outbound/index.md

@@ -30,6 +30,7 @@
 | `shadowtls`    | [ShadowTLS](./shadowtls/)       |
 | `tuic`         | [TUIC](./tuic/)                 |
 | `hysteria2`    | [Hysteria2](./hysteria2/)       |
+| `mieru`        | [Mieru](./mieru/)               |
 | `anytls`       | [AnyTLS](./anytls/)             |
 | `tor`          | [Tor](./tor/)                   |
 | `ssh`          | [SSH](./ssh/)                   |