documentation: Bump version

Network Extension was observed to stop for unknown reasons

.github/workflows/build.yml

@@ -144,7 +144,7 @@ jobs:
             ~/go/go1.20.14
           key: go120
       - name: Setup legacy Go
-        if: matrix.require_legacy_go == 'true' && steps.cache-legacy-go.outputs.cache-hit != 'true'
+        if: matrix.require_legacy_go && steps.cache-legacy-go.outputs.cache-hit != 'true'
         run: |-
           wget https://dl.google.com/go/go1.20.14.linux-amd64.tar.gz
           tar -xzf go1.20.14.linux-amd64.tar.gz
@@ -159,7 +159,7 @@ jobs:
         uses: goreleaser/goreleaser-action@v6
         with:
           distribution: goreleaser-pro
-          version: latest
+          version: 2.5.1
           install-only: true
       - name: Extract signing key
         run: |-
@@ -224,7 +224,7 @@ jobs:
         id: setup-ndk
         uses: nttld/setup-ndk@v1
         with:
-          ndk-version: r28-beta2
+          ndk-version: r28-beta3
       - name: Setup OpenJDK
         run: |-
           sudo apt update && sudo apt install -y openjdk-17-jdk-headless
@@ -256,8 +256,7 @@ jobs:
         with:
           path: ~/.gradle
           key: gradle-${{ hashFiles('**/*.gradle') }}
-      - name: Build release
-        if: github.event_name == 'workflow_dispatch'
+      - name: Build
         run: |-
           go run -v ./cmd/internal/update_android_version --ci
           mkdir clients/android/app/libs
@@ -268,47 +267,18 @@ jobs:
           JAVA_HOME: /usr/lib/jvm/java-17-openjdk-amd64
           ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
           LOCAL_PROPERTIES: ${{ secrets.LOCAL_PROPERTIES }}
-      - name: Build debug
-        if: github.event_name != 'workflow_dispatch'
-        run: |-
-          go run -v ./cmd/internal/update_android_version --ci
-          mkdir clients/android/app/libs
-          cp libbox.aar clients/android/app/libs
-          cd clients/android
-          ./gradlew :app:assemblePlayRelease
-        env:
-          JAVA_HOME: /usr/lib/jvm/java-17-openjdk-amd64
-          ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
-          LOCAL_PROPERTIES: ${{ secrets.LOCAL_PROPERTIES }}
-      - name: Prepare release upload
+      - name: Prepare upload
         if: github.event_name == 'workflow_dispatch'
         run: |-
           mkdir -p dist/release
           cp clients/android/app/build/outputs/apk/play/release/*.apk dist/release
           cp clients/android/app/build/outputs/apk/other/release/*-universal.apk dist/release
-      - name: Prepare debug upload
-        if: github.event_name != 'workflow_dispatch'
-        run: |-
-          mkdir -p dist/release
-          cp clients/android/app/build/outputs/apk/play/release/*.apk dist/release
       - name: Upload artifact
         if: github.event_name == 'workflow_dispatch'
         uses: actions/upload-artifact@v4
         with:
           name: binary-android-apks
           path: 'dist'
-      - name: Upload debug apk (arm64-v8a)
-        if: github.event_name != 'workflow_dispatch'
-        uses: actions/upload-artifact@v4
-        with:
-          name: "SFA-${{ needs.calculate_version.outputs.version }}-arm64-v8a.apk"
-          path: 'dist/release/*-arm64-v8a.apk'
-      - name: Upload debug apk (universal)
-        if: github.event_name != 'workflow_dispatch'
-        uses: actions/upload-artifact@v4
-        with:
-          name: "SFA-${{ needs.calculate_version.outputs.version }}-universal.apk"
-          path: 'dist/release/*-universal.apk'
   publish_android:
     name: Publish Android
     if: github.event_name == 'workflow_dispatch' && inputs.build == 'publish-android'
@@ -329,7 +299,7 @@ jobs:
         id: setup-ndk
         uses: nttld/setup-ndk@v1
         with:
-          ndk-version: r28-beta2
+          ndk-version: r28-beta3
       - name: Setup OpenJDK
         run: |-
           sudo apt update && sudo apt install -y openjdk-17-jdk-headless
@@ -578,7 +548,7 @@ jobs:
         uses: goreleaser/goreleaser-action@v6
         with:
           distribution: goreleaser-pro
-          version: latest
+          version: 2.5.1
           install-only: true
       - name: Cache ghr
         uses: actions/cache@v4

.goreleaser.fury.yaml

@@ -6,7 +6,9 @@ builds:
       - -v
       - -trimpath
     ldflags:
-      - -X github.com/sagernet/sing-box/constant.Version={{ .Version }} -s -w -buildid=
+      - -X github.com/sagernet/sing-box/constant.Version={{ .Version }}
+      - -s
+      - -buildid=
     tags:
       - with_gvisor
       - with_quic

.goreleaser.yaml

@@ -52,7 +52,7 @@ builds:
     env:
       - CGO_ENABLED=0
       - GOROOT={{ .Env.GOPATH }}/go1.20.14
-    gobinary: "{{ .Env.GOPATH }}/go1.20.14/bin/go"
+    tool: "{{ .Env.GOPATH }}/go1.20.14/bin/go"
     targets:
       - windows_amd64_v1
       - windows_386

Makefile

@@ -61,6 +61,9 @@ proto_install:
 	go install -v google.golang.org/protobuf/cmd/protoc-gen-go@latest
 	go install -v google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
 
+update_certificates:
+	go run ./cmd/internal/update_certificates
+
 release:
 	go run ./cmd/internal/build goreleaser release --clean --skip publish
 	mkdir dist/release

adapter/certificate.go

@@ -0,0 +1,21 @@
+package adapter
+
+import (
+	"context"
+	"crypto/x509"
+
+	"github.com/sagernet/sing/service"
+)
+
+type CertificateStore interface {
+	LifecycleService
+	Pool() *x509.CertPool
+}
+
+func RootPoolFromContext(ctx context.Context) *x509.CertPool {
+	store := service.FromContext[CertificateStore](ctx)
+	if store == nil {
+		return nil
+	}
+	return store.Pool()
+}

adapter/dns.go

@@ -0,0 +1,73 @@
+package adapter
+
+import (
+	"context"
+	"net/netip"
+
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common/logger"
+
+	"github.com/miekg/dns"
+)
+
+type DNSRouter interface {
+	Lifecycle
+	Exchange(ctx context.Context, message *dns.Msg, options DNSQueryOptions) (*dns.Msg, error)
+	Lookup(ctx context.Context, domain string, options DNSQueryOptions) ([]netip.Addr, error)
+	ClearCache()
+	LookupReverseMapping(ip netip.Addr) (string, bool)
+	ResetNetwork()
+}
+
+type DNSClient interface {
+	Start()
+	Exchange(ctx context.Context, transport DNSTransport, message *dns.Msg, options DNSQueryOptions, responseChecker func(responseAddrs []netip.Addr) bool) (*dns.Msg, error)
+	Lookup(ctx context.Context, transport DNSTransport, domain string, options DNSQueryOptions, responseChecker func(responseAddrs []netip.Addr) bool) ([]netip.Addr, error)
+	LookupCache(domain string, strategy C.DomainStrategy) ([]netip.Addr, bool)
+	ExchangeCache(ctx context.Context, message *dns.Msg) (*dns.Msg, bool)
+	ClearCache()
+}
+
+type DNSQueryOptions struct {
+	Transport    DNSTransport
+	Strategy     C.DomainStrategy
+	DisableCache bool
+	RewriteTTL   *uint32
+	ClientSubnet netip.Prefix
+}
+
+type RDRCStore interface {
+	LoadRDRC(transportName string, qName string, qType uint16) (rejected bool)
+	SaveRDRC(transportName string, qName string, qType uint16) error
+	SaveRDRCAsync(transportName string, qName string, qType uint16, logger logger.Logger)
+}
+
+type DNSTransport interface {
+	Type() string
+	Tag() string
+	Dependencies() []string
+	Reset()
+	Exchange(ctx context.Context, message *dns.Msg) (*dns.Msg, error)
+}
+
+type LegacyDNSTransport interface {
+	LegacyStrategy() C.DomainStrategy
+	LegacyClientSubnet() netip.Prefix
+}
+
+type DNSTransportRegistry interface {
+	option.DNSTransportOptionsRegistry
+	CreateDNSTransport(ctx context.Context, logger log.ContextLogger, tag string, transportType string, options any) (DNSTransport, error)
+}
+
+type DNSTransportManager interface {
+	Lifecycle
+	Transports() []DNSTransport
+	Transport(tag string) (DNSTransport, bool)
+	Default() DNSTransport
+	FakeIP() FakeIPTransport
+	Remove(tag string) error
+	Create(ctx context.Context, logger log.ContextLogger, tag string, outboundType string, options any) error
+}

adapter/experimental.go

@@ -6,8 +6,6 @@ import (
 	"encoding/binary"
 	"time"
 
-	"github.com/sagernet/sing-box/common/urltest"
-	"github.com/sagernet/sing-dns"
 	"github.com/sagernet/sing/common/varbin"
 )
 
@@ -16,7 +14,20 @@ type ClashServer interface {
 	ConnectionTracker
 	Mode() string
 	ModeList() []string
-	HistoryStorage() *urltest.HistoryStorage
+	HistoryStorage() URLTestHistoryStorage
+}
+
+type URLTestHistory struct {
+	Time  time.Time `json:"time"`
+	Delay uint16    `json:"delay"`
+}
+
+type URLTestHistoryStorage interface {
+	SetHook(hook chan<- struct{})
+	LoadURLTestHistory(tag string) *URLTestHistory
+	DeleteURLTestHistory(tag string)
+	StoreURLTestHistory(tag string, history *URLTestHistory)
+	Close() error
 }
 
 type V2RayServer interface {
@@ -31,7 +42,7 @@ type CacheFile interface {
 	FakeIPStorage
 
 	StoreRDRC() bool
-	dns.RDRCStore
+	RDRCStore
 
 	LoadMode() string
 	StoreMode(mode string) error
@@ -39,17 +50,17 @@ type CacheFile interface {
 	StoreSelected(group string, selected string) error
 	LoadGroupExpand(group string) (isExpand bool, loaded bool)
 	StoreGroupExpand(group string, expand bool) error
-	LoadRuleSet(tag string) *SavedRuleSet
-	SaveRuleSet(tag string, set *SavedRuleSet) error
+	LoadRuleSet(tag string) *SavedBinary
+	SaveRuleSet(tag string, set *SavedBinary) error
 }
 
-type SavedRuleSet struct {
+type SavedBinary struct {
 	Content     []byte
 	LastUpdated time.Time
 	LastEtag    string
 }
 
-func (s *SavedRuleSet) MarshalBinary() ([]byte, error) {
+func (s *SavedBinary) MarshalBinary() ([]byte, error) {
 	var buffer bytes.Buffer
 	err := binary.Write(&buffer, binary.BigEndian, uint8(1))
 	if err != nil {
@@ -70,7 +81,7 @@ func (s *SavedRuleSet) MarshalBinary() ([]byte, error) {
 	return buffer.Bytes(), nil
 }
 
-func (s *SavedRuleSet) UnmarshalBinary(data []byte) error {
+func (s *SavedBinary) UnmarshalBinary(data []byte) error {
 	reader := bytes.NewReader(data)
 	var version uint8
 	err := binary.Read(reader, binary.BigEndian, &version)

adapter/fakeip.go

@@ -3,7 +3,6 @@ package adapter
 import (
 	"net/netip"
 
-	"github.com/sagernet/sing-dns"
 	"github.com/sagernet/sing/common/logger"
 )
 
@@ -27,6 +26,6 @@ type FakeIPStorage interface {
 }
 
 type FakeIPTransport interface {
-	dns.Transport
+	DNSTransport
 	Store() FakeIPStore
 }

adapter/inbound.go

@@ -71,14 +71,14 @@ type InboundContext struct {
 	UDPDisableDomainUnmapping bool
 	UDPConnect                bool
 	UDPTimeout                time.Duration
+	TLSFragment               bool
+	TLSFragmentFallbackDelay  time.Duration
 
 	NetworkStrategy     *C.NetworkStrategy
 	NetworkType         []C.InterfaceType
 	FallbackNetworkType []C.InterfaceType
 	FallbackDelay       time.Duration
 
-	DNSServer string
-
 	DestinationAddresses []netip.Addr
 	SourceGeoIPCode      string
 	GeoIPCode            string

adapter/network.go

@@ -28,12 +28,14 @@ type NetworkManager interface {
 }
 
 type NetworkOptions struct {
-	NetworkStrategy     *C.NetworkStrategy
-	NetworkType         []C.InterfaceType
-	FallbackNetworkType []C.InterfaceType
-	FallbackDelay       time.Duration
-	BindInterface       string
-	RoutingMark         uint32
+	BindInterface        string
+	RoutingMark          uint32
+	DomainResolver       string
+	DomainResolveOptions DNSQueryOptions
+	NetworkStrategy      *C.NetworkStrategy
+	NetworkType          []C.InterfaceType
+	FallbackNetworkType  []C.InterfaceType
+	FallbackDelay        time.Duration
 }
 
 type InterfaceUpdateListener interface {

adapter/outbound/manager.go

@@ -23,7 +23,7 @@ type Manager struct {
 	registry                adapter.OutboundRegistry
 	endpoint                adapter.EndpointManager
 	defaultTag              string
-	access                  sync.Mutex
+	access                  sync.RWMutex
 	started                 bool
 	stage                   adapter.StartStage
 	outbounds               []adapter.Outbound
@@ -169,15 +169,15 @@ func (m *Manager) Close() error {
 }
 
 func (m *Manager) Outbounds() []adapter.Outbound {
-	m.access.Lock()
-	defer m.access.Unlock()
+	m.access.RLock()
+	defer m.access.RUnlock()
 	return m.outbounds
 }
 
 func (m *Manager) Outbound(tag string) (adapter.Outbound, bool) {
-	m.access.Lock()
+	m.access.RLock()
 	outbound, found := m.outboundByTag[tag]
-	m.access.Unlock()
+	m.access.RUnlock()
 	if found {
 		return outbound, true
 	}
@@ -185,8 +185,8 @@ func (m *Manager) Outbound(tag string) (adapter.Outbound, bool) {
 }
 
 func (m *Manager) Default() adapter.Outbound {
-	m.access.Lock()
-	defer m.access.Unlock()
+	m.access.RLock()
+	defer m.access.RUnlock()
 	if m.defaultOutbound != nil {
 		return m.defaultOutbound
 	} else {
@@ -196,9 +196,9 @@ func (m *Manager) Default() adapter.Outbound {
 
 func (m *Manager) Remove(tag string) error {
 	m.access.Lock()
+	defer m.access.Unlock()
 	outbound, found := m.outboundByTag[tag]
 	if !found {
-		m.access.Unlock()
 		return os.ErrInvalid
 	}
 	delete(m.outboundByTag, tag)
@@ -232,7 +232,6 @@ func (m *Manager) Remove(tag string) error {
 			})
 		}
 	}
-	m.access.Unlock()
 	if started {
 		return common.Close(outbound)
 	}

adapter/router.go

@@ -2,44 +2,29 @@ package adapter
 
 import (
 	"context"
+	"crypto/tls"
 	"net"
 	"net/http"
-	"net/netip"
 	"sync"
 
-	"github.com/sagernet/sing-box/common/geoip"
 	C "github.com/sagernet/sing-box/constant"
-	"github.com/sagernet/sing-dns"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/ntp"
 	"github.com/sagernet/sing/common/x/list"
 
-	mdns "github.com/miekg/dns"
 	"go4.org/netipx"
 )
 
 type Router interface {
 	Lifecycle
-
-	FakeIPStore() FakeIPStore
-
 	ConnectionRouter
 	PreMatch(metadata InboundContext) error
 	ConnectionRouterEx
-
-	GeoIPReader() *geoip.Reader
-	LoadGeosite(code string) (Rule, error)
 	RuleSet(tag string) (RuleSet, bool)
 	NeedWIFIState() bool
-
-	Exchange(ctx context.Context, message *mdns.Msg) (*mdns.Msg, error)
-	Lookup(ctx context.Context, domain string, strategy dns.DomainStrategy) ([]netip.Addr, error)
-	LookupDefault(ctx context.Context, domain string) ([]netip.Addr, error)
-	ClearDNSCache()
 	Rules() []Rule
-
 	SetTracker(tracker ConnectionTracker)
-
 	ResetNetwork()
 }
 
@@ -83,12 +68,14 @@ type RuleSetMetadata struct {
 	ContainsIPCIDRRule  bool
 }
 type HTTPStartContext struct {
+	ctx             context.Context
 	access          sync.Mutex
 	httpClientCache map[string]*http.Client
 }
 
-func NewHTTPStartContext() *HTTPStartContext {
+func NewHTTPStartContext(ctx context.Context) *HTTPStartContext {
 	return &HTTPStartContext{
+		ctx:             ctx,
 		httpClientCache: make(map[string]*http.Client),
 	}
 }
@@ -106,6 +93,10 @@ func (c *HTTPStartContext) HTTPClient(detour string, dialer N.Dialer) *http.Clie
 			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
 				return dialer.DialContext(ctx, network, M.ParseSocksaddr(addr))
 			},
+			TLSClientConfig: &tls.Config{
+				Time:    ntp.TimeFuncFromContext(c.ctx),
+				RootCAs: RootPoolFromContext(c.ctx),
+			},
 		},
 	}
 	c.httpClientCache[detour] = httpClient

adapter/rule.go

@@ -13,7 +13,6 @@ type Rule interface {
 	HeadlessRule
 	Service
 	Type() string
-	UpdateGeosite() error
 	Action() RuleAction
 }
 

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/common/conntrack"
+	"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"
 	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/dns/transport/local"
 	"github.com/sagernet/sing-box/experimental"
 	"github.com/sagernet/sing-box/experimental/cachefile"
 	"github.com/sagernet/sing-box/experimental/libbox/platform"
@@ -35,17 +37,19 @@ import (
 var _ adapter.Service = (*Box)(nil)
 
 type Box struct {
-	createdAt  time.Time
-	logFactory log.Factory
-	logger     log.ContextLogger
-	network    *route.NetworkManager
-	endpoint   *endpoint.Manager
-	inbound    *inbound.Manager
-	outbound   *outbound.Manager
-	connection *route.ConnectionManager
-	router     *route.Router
-	services   []adapter.LifecycleService
-	done       chan struct{}
+	createdAt    time.Time
+	logFactory   log.Factory
+	logger       log.ContextLogger
+	network      *route.NetworkManager
+	endpoint     *endpoint.Manager
+	inbound      *inbound.Manager
+	outbound     *outbound.Manager
+	dnsTransport *dns.TransportManager
+	dnsRouter    *dns.Router
+	connection   *route.ConnectionManager
+	router       *route.Router
+	services     []adapter.LifecycleService
+	done         chan struct{}
 }
 
 type Options struct {
@@ -59,6 +63,7 @@ func Context(
 	inboundRegistry adapter.InboundRegistry,
 	outboundRegistry adapter.OutboundRegistry,
 	endpointRegistry adapter.EndpointRegistry,
+	dnsTransportRegistry adapter.DNSTransportRegistry,
 ) context.Context {
 	if service.FromContext[option.InboundOptionsRegistry](ctx) == nil ||
 		service.FromContext[adapter.InboundRegistry](ctx) == nil {
@@ -75,6 +80,10 @@ func Context(
 		ctx = service.ContextWith[option.EndpointOptionsRegistry](ctx, endpointRegistry)
 		ctx = service.ContextWith[adapter.EndpointRegistry](ctx, endpointRegistry)
 	}
+	if service.FromContext[adapter.DNSTransportRegistry](ctx) == nil {
+		ctx = service.ContextWith[option.DNSTransportOptionsRegistry](ctx, dnsTransportRegistry)
+		ctx = service.ContextWith[adapter.DNSTransportRegistry](ctx, dnsTransportRegistry)
+	}
 	return ctx
 }
 
@@ -85,9 +94,11 @@ func New(options Options) (*Box, error) {
 		ctx = context.Background()
 	}
 	ctx = service.ContextWithDefaultRegistry(ctx)
+
 	endpointRegistry := service.FromContext[adapter.EndpointRegistry](ctx)
 	inboundRegistry := service.FromContext[adapter.InboundRegistry](ctx)
 	outboundRegistry := service.FromContext[adapter.OutboundRegistry](ctx)
+	dnsTransportRegistry := service.FromContext[adapter.DNSTransportRegistry](ctx)
 
 	if endpointRegistry == nil {
 		return nil, E.New("missing endpoint registry in context")
@@ -101,10 +112,7 @@ func New(options Options) (*Box, error) {
 
 	ctx = pause.WithDefaultManager(ctx)
 	experimentalOptions := common.PtrValueOrDefault(options.Experimental)
-	debugOptions := common.PtrValueOrDefault(experimentalOptions.Debug)
-	applyDebugOptions(debugOptions)
-	ctx = conntrack.ContextWithDefaultTracker(ctx, debugOptions.OOMKiller, uint64(debugOptions.MemoryLimit))
-
+	applyDebugOptions(common.PtrValueOrDefault(experimentalOptions.Debug))
 	var needCacheFile bool
 	var needClashAPI bool
 	var needV2RayAPI bool
@@ -134,14 +142,32 @@ func New(options Options) (*Box, error) {
 		return nil, E.Cause(err, "create log factory")
 	}
 
+	var services []adapter.LifecycleService
+	certificateOptions := common.PtrValueOrDefault(options.Certificate)
+	if C.IsAndroid || certificateOptions.Store != "" && certificateOptions.Store != C.CertificateStoreSystem ||
+		len(certificateOptions.Certificate) > 0 ||
+		len(certificateOptions.CertificatePath) > 0 ||
+		len(certificateOptions.CertificateDirectoryPath) > 0 {
+		certificateStore, err := certificate.NewStore(ctx, logFactory.NewLogger("certificate"), certificateOptions)
+		if err != nil {
+			return nil, err
+		}
+		service.MustRegister[adapter.CertificateStore](ctx, certificateStore)
+		services = append(services, certificateStore)
+	}
+
 	routeOptions := common.PtrValueOrDefault(options.Route)
+	dnsOptions := common.PtrValueOrDefault(options.DNS)
 	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)
+	dnsTransportManager := dns.NewTransportManager(logFactory.NewLogger("dns/transport"), dnsTransportRegistry, outboundManager, dnsOptions.Final)
 	service.MustRegister[adapter.EndpointManager](ctx, endpointManager)
 	service.MustRegister[adapter.InboundManager](ctx, inboundManager)
 	service.MustRegister[adapter.OutboundManager](ctx, outboundManager)
-
+	service.MustRegister[adapter.DNSTransportManager](ctx, dnsTransportManager)
+	dnsRouter := dns.NewRouter(ctx, logFactory, dnsOptions)
+	service.MustRegister[adapter.DNSRouter](ctx, dnsRouter)
 	networkManager, err := route.NewNetworkManager(ctx, logFactory.NewLogger("network"), routeOptions)
 	if err != nil {
 		return nil, E.Cause(err, "initialize network manager")
@@ -149,18 +175,40 @@ func New(options Options) (*Box, error) {
 	service.MustRegister[adapter.NetworkManager](ctx, networkManager)
 	connectionManager := route.NewConnectionManager(logFactory.NewLogger("connection"))
 	service.MustRegister[adapter.ConnectionManager](ctx, connectionManager)
-	router, err := route.NewRouter(ctx, logFactory, routeOptions, common.PtrValueOrDefault(options.DNS))
+	router := route.NewRouter(ctx, logFactory, routeOptions, dnsOptions)
+	service.MustRegister[adapter.Router](ctx, router)
+	err = router.Initialize(routeOptions.Rules, routeOptions.RuleSet)
 	if err != nil {
 		return nil, E.Cause(err, "initialize router")
 	}
-
 	ntpOptions := common.PtrValueOrDefault(options.NTP)
 	var timeService *tls.TimeServiceWrapper
 	if ntpOptions.Enabled {
 		timeService = new(tls.TimeServiceWrapper)
 		service.MustRegister[ntp.TimeService](ctx, timeService)
 	}
-
+	for i, transportOptions := range dnsOptions.Servers {
+		var tag string
+		if transportOptions.Tag != "" {
+			tag = transportOptions.Tag
+		} else {
+			tag = F.ToString(i)
+		}
+		err = dnsTransportManager.Create(
+			ctx,
+			logFactory.NewLogger(F.ToString("dns/", transportOptions.Type, "[", tag, "]")),
+			tag,
+			transportOptions.Type,
+			transportOptions.Options,
+		)
+		if err != nil {
+			return nil, E.Cause(err, "initialize DNS server[", i, "]")
+		}
+	}
+	err = dnsRouter.Initialize(dnsOptions.Rules)
+	if err != nil {
+		return nil, E.Cause(err, "initialize dns router")
+	}
 	for i, endpointOptions := range options.Endpoints {
 		var tag string
 		if endpointOptions.Tag != "" {
@@ -168,7 +216,8 @@ func New(options Options) (*Box, error) {
 		} else {
 			tag = F.ToString(i)
 		}
-		err = endpointManager.Create(ctx,
+		err = endpointManager.Create(
+			ctx,
 			router,
 			logFactory.NewLogger(F.ToString("endpoint/", endpointOptions.Type, "[", tag, "]")),
 			tag,
@@ -176,7 +225,7 @@ func New(options Options) (*Box, error) {
 			endpointOptions.Options,
 		)
 		if err != nil {
-			return nil, E.Cause(err, "initialize inbound[", i, "]")
+			return nil, E.Cause(err, "initialize endpoint[", i, "]")
 		}
 	}
 	for i, inboundOptions := range options.Inbounds {
@@ -186,7 +235,8 @@ func New(options Options) (*Box, error) {
 		} else {
 			tag = F.ToString(i)
 		}
-		err = inboundManager.Create(ctx,
+		err = inboundManager.Create(
+			ctx,
 			router,
 			logFactory.NewLogger(F.ToString("inbound/", inboundOptions.Type, "[", tag, "]")),
 			tag,
@@ -232,13 +282,19 @@ func New(options Options) (*Box, error) {
 			option.DirectOutboundOptions{},
 		),
 	))
+	dnsTransportManager.Initialize(common.Must1(
+		local.NewTransport(
+			ctx,
+			logFactory.NewLogger("dns/local"),
+			"local",
+			option.LocalDNSServerOptions{},
+		)))
 	if platformInterface != nil {
 		err = platformInterface.Initialize(networkManager)
 		if err != nil {
 			return nil, E.Cause(err, "initialize platform interface")
 		}
 	}
-	var services []adapter.LifecycleService
 	if needCacheFile {
 		cacheFile := cachefile.New(ctx, common.PtrValueOrDefault(experimentalOptions.CacheFile))
 		service.MustRegister[adapter.CacheFile](ctx, cacheFile)
@@ -267,7 +323,7 @@ func New(options Options) (*Box, error) {
 		}
 	}
 	if ntpOptions.Enabled {
-		ntpDialer, err := dialer.New(ctx, ntpOptions.DialerOptions)
+		ntpDialer, err := dialer.New(ctx, ntpOptions.DialerOptions, ntpOptions.ServerIsDomain())
 		if err != nil {
 			return nil, E.Cause(err, "create NTP service")
 		}
@@ -283,17 +339,19 @@ func New(options Options) (*Box, error) {
 		services = append(services, adapter.NewLifecycleService(ntpService, "ntp service"))
 	}
 	return &Box{
-		network:    networkManager,
-		endpoint:   endpointManager,
-		inbound:    inboundManager,
-		outbound:   outboundManager,
-		connection: connectionManager,
-		router:     router,
-		createdAt:  createdAt,
-		logFactory: logFactory,
-		logger:     logFactory.Logger(),
-		services:   services,
-		done:       make(chan struct{}),
+		network:      networkManager,
+		endpoint:     endpointManager,
+		inbound:      inboundManager,
+		outbound:     outboundManager,
+		dnsTransport: dnsTransportManager,
+		dnsRouter:    dnsRouter,
+		connection:   connectionManager,
+		router:       router,
+		createdAt:    createdAt,
+		logFactory:   logFactory,
+		logger:       logFactory.Logger(),
+		services:     services,
+		done:         make(chan struct{}),
 	}, nil
 }
 
@@ -347,11 +405,11 @@ func (s *Box) preStart() error {
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(adapter.StartStateInitialize, s.network, s.connection, s.router, s.outbound, s.inbound, s.endpoint)
+	err = adapter.Start(adapter.StartStateInitialize, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.outbound, s.inbound, s.endpoint)
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(adapter.StartStateStart, s.outbound, s.network, s.connection, s.router)
+	err = adapter.Start(adapter.StartStateStart, s.outbound, s.dnsTransport, s.dnsRouter, s.network, s.connection, s.router)
 	if err != nil {
 		return err
 	}
@@ -375,7 +433,7 @@ func (s *Box) start() error {
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(adapter.StartStatePostStart, s.outbound, s.network, s.connection, s.router, s.inbound, s.endpoint)
+	err = adapter.Start(adapter.StartStatePostStart, s.outbound, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.inbound, s.endpoint)
 	if err != nil {
 		return err
 	}
@@ -383,7 +441,7 @@ func (s *Box) start() error {
 	if err != nil {
 		return err
 	}
-	err = adapter.Start(adapter.StartStateStarted, s.network, s.connection, s.router, s.outbound, s.inbound, s.endpoint)
+	err = adapter.Start(adapter.StartStateStarted, s.network, s.dnsTransport, s.dnsRouter, s.connection, s.router, s.outbound, s.inbound, s.endpoint)
 	if err != nil {
 		return err
 	}
@@ -402,7 +460,7 @@ func (s *Box) Close() error {
 		close(s.done)
 	}
 	err := common.Close(
-		s.inbound, s.outbound, s.router, s.connection, s.network,
+		s.inbound, s.outbound, s.endpoint, s.router, s.connection, s.dnsRouter, s.dnsTransport, s.network,
 	)
 	for _, lifecycleService := range s.services {
 		err = E.Append(err, lifecycleService.Close(), func(err error) error {

cmd/internal/app_store_connect/main.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/sagernet/asc-go/asc"
@@ -194,6 +195,10 @@ func publishTestflight(ctx context.Context) error {
 				log.Info(string(platform), " ", tag, " create submission")
 				_, _, err = client.TestFlight.CreateBetaAppReviewSubmission(ctx, build.ID)
 				if err != nil {
+					if strings.Contains(err.Error(), "ANOTHER_BUILD_IN_REVIEW") {
+						log.Error(err)
+						break
+					}
 					return err
 				}
 			}

cmd/internal/build_shared/sdk.go

@@ -48,7 +48,7 @@ func FindSDK() {
 }
 
 func findNDK() bool {
-	const fixedVersion = "28.0.12674087"
+	const fixedVersion = "28.0.12916984"
 	const versionFile = "source.properties"
 	if fixedPath := filepath.Join(androidSDKPath, "ndk", fixedVersion); rw.IsFile(filepath.Join(fixedPath, versionFile)) {
 		androidNDKPath = fixedPath

cmd/internal/update_certificates/main.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"encoding/csv"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/sagernet/sing-box/log"
+
+	"golang.org/x/exp/slices"
+)
+
+func main() {
+	err := updateMozillaIncludedRootCAs()
+	if err != nil {
+		log.Error(err)
+	}
+}
+
+func updateMozillaIncludedRootCAs() error {
+	response, err := http.Get("https://ccadb.my.salesforce-sites.com/mozilla/IncludedCACertificateReportPEMCSV")
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	reader := csv.NewReader(response.Body)
+	header, err := reader.Read()
+	if err != nil {
+		return err
+	}
+	geoIndex := slices.Index(header, "Geographic Focus")
+	nameIndex := slices.Index(header, "Common Name or Certificate Name")
+	certIndex := slices.Index(header, "PEM Info")
+
+	generated := strings.Builder{}
+	generated.WriteString(`// Code generated by 'make update_certificates'. DO NOT EDIT.
+
+package certificate
+
+import "crypto/x509"
+
+var mozillaIncluded *x509.CertPool
+
+func init() {
+	mozillaIncluded = x509.NewCertPool()
+`)
+	for {
+		record, err := reader.Read()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return err
+		}
+		if record[geoIndex] == "China" {
+			continue
+		}
+		generated.WriteString("\n	// ")
+		generated.WriteString(record[nameIndex])
+		generated.WriteString("\n")
+		generated.WriteString("	mozillaIncluded.AppendCertsFromPEM([]byte(`")
+		generated.WriteString(record[certIndex])
+		generated.WriteString("`))\n")
+	}
+	generated.WriteString("}\n")
+	return os.WriteFile("common/certificate/mozilla.go", []byte(generated.String()), 0o644)
+}

cmd/sing-box/cmd.go

@@ -69,5 +69,5 @@ func preRun(cmd *cobra.Command, args []string) {
 		configPaths = append(configPaths, "config.json")
 	}
 	globalCtx = service.ContextWith(globalCtx, deprecated.NewStderrManager(log.StdLogger()))
-	globalCtx = box.Context(globalCtx, include.InboundRegistry(), include.OutboundRegistry(), include.EndpointRegistry())
+	globalCtx = box.Context(globalCtx, include.InboundRegistry(), include.OutboundRegistry(), include.EndpointRegistry(), include.DNSTransportRegistry())
 }

cmd/sing-box/cmd_generate_tls.go

@@ -30,7 +30,7 @@ func init() {
 }
 
 func generateTLSKeyPair(serverName string) error {
-	privateKeyPem, publicKeyPem, err := tls.GenerateKeyPair(time.Now, serverName, time.Now().AddDate(0, flagGenerateTLSKeyPairMonths, 0))
+	privateKeyPem, publicKeyPem, err := tls.GenerateCertificate(nil, nil, time.Now, serverName, time.Now().AddDate(0, flagGenerateTLSKeyPairMonths, 0))
 	if err != nil {
 		return err
 	}

cmd/sing-box/cmd_rule_set_upgrade.go

@@ -61,14 +61,15 @@ func upgradeRuleSet(sourcePath string) error {
 		log.Info("already up-to-date")
 		return nil
 	}
-	plainRuleSet, err := plainRuleSetCompat.Upgrade()
+	plainRuleSetCompat.Options, err = plainRuleSetCompat.Upgrade()
 	if err != nil {
 		return err
 	}
+	plainRuleSetCompat.Version = C.RuleSetVersionCurrent
 	buffer := new(bytes.Buffer)
 	encoder := json.NewEncoder(buffer)
 	encoder.SetIndent("", "  ")
-	err = encoder.Encode(plainRuleSet)
+	err = encoder.Encode(plainRuleSetCompat)
 	if err != nil {
 		return E.Cause(err, "encode config")
 	}

cmd/sing-box/cmd_tools_synctime.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"os"
 
-	"github.com/sagernet/sing-box/common/settings"
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/log"
 	E "github.com/sagernet/sing/common/exceptions"
@@ -58,7 +57,7 @@ func syncTime() error {
 		return err
 	}
 	if commandSyncTimeWrite {
-		err = settings.SetSystemTime(response.Time)
+		err = ntp.SetSystemTime(response.Time)
 		if err != nil {
 			return E.Cause(err, "write time to system")
 		}

common/certificate/store.go

@@ -0,0 +1,184 @@
+package certificate
+
+import (
+	"context"
+	"crypto/x509"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/sagernet/fswatch"
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/experimental/libbox/platform"
+	"github.com/sagernet/sing-box/option"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	"github.com/sagernet/sing/service"
+)
+
+var _ adapter.CertificateStore = (*Store)(nil)
+
+type Store struct {
+	systemPool                *x509.CertPool
+	currentPool               *x509.CertPool
+	certificate               string
+	certificatePaths          []string
+	certificateDirectoryPaths []string
+	watcher                   *fswatch.Watcher
+}
+
+func NewStore(ctx context.Context, logger logger.Logger, options option.CertificateOptions) (*Store, error) {
+	var systemPool *x509.CertPool
+	switch options.Store {
+	case C.CertificateStoreSystem, "":
+		platformInterface := service.FromContext[platform.Interface](ctx)
+		systemCertificates := platformInterface.SystemCertificates()
+		if len(systemCertificates) > 0 {
+			systemPool = x509.NewCertPool()
+			for _, cert := range systemCertificates {
+				if !systemPool.AppendCertsFromPEM([]byte(cert)) {
+					return nil, E.New("invalid system certificate PEM: ", cert)
+				}
+			}
+		} else {
+			certPool, err := x509.SystemCertPool()
+			if err != nil {
+				return nil, err
+			}
+			systemPool = certPool
+		}
+	case C.CertificateStoreMozilla:
+		systemPool = mozillaIncluded
+	case C.CertificateStoreNone:
+		systemPool = nil
+	default:
+		return nil, E.New("unknown certificate store: ", options.Store)
+	}
+	store := &Store{
+		systemPool:                systemPool,
+		certificate:               strings.Join(options.Certificate, "\n"),
+		certificatePaths:          options.CertificatePath,
+		certificateDirectoryPaths: options.CertificateDirectoryPath,
+	}
+	var watchPaths []string
+	for _, target := range options.CertificatePath {
+		watchPaths = append(watchPaths, target)
+	}
+	for _, target := range options.CertificateDirectoryPath {
+		watchPaths = append(watchPaths, target)
+	}
+	if len(watchPaths) > 0 {
+		watcher, err := fswatch.NewWatcher(fswatch.Options{
+			Path:   watchPaths,
+			Logger: logger,
+			Callback: func(_ string) {
+				err := store.update()
+				if err != nil {
+					logger.Error(E.Cause(err, "reload certificates"))
+				}
+			},
+		})
+		if err != nil {
+			return nil, E.Cause(err, "fswatch: create fsnotify watcher")
+		}
+		store.watcher = watcher
+	}
+	err := store.update()
+	if err != nil {
+		return nil, E.Cause(err, "initializing certificate store")
+	}
+	return store, nil
+}
+
+func (s *Store) Name() string {
+	return "certificate"
+}
+
+func (s *Store) Start(stage adapter.StartStage) error {
+	if stage != adapter.StartStateStart {
+		return nil
+	}
+	if s.watcher != nil {
+		return s.watcher.Start()
+	}
+	return nil
+}
+
+func (s *Store) Close() error {
+	if s.watcher != nil {
+		return s.watcher.Close()
+	}
+	return nil
+}
+
+func (s *Store) Pool() *x509.CertPool {
+	return s.currentPool
+}
+
+func (s *Store) update() error {
+	var currentPool *x509.CertPool
+	if s.systemPool == nil {
+		currentPool = x509.NewCertPool()
+	} else {
+		currentPool = s.systemPool.Clone()
+	}
+	if s.certificate != "" {
+		if !currentPool.AppendCertsFromPEM([]byte(s.certificate)) {
+			return E.New("invalid certificate PEM strings")
+		}
+	}
+	for _, path := range s.certificatePaths {
+		pemContent, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+		if !currentPool.AppendCertsFromPEM(pemContent) {
+			return E.New("invalid certificate PEM file: ", path)
+		}
+	}
+	var firstErr error
+	for _, directoryPath := range s.certificateDirectoryPaths {
+		directoryEntries, err := readUniqueDirectoryEntries(directoryPath)
+		if err != nil {
+			if firstErr == nil && !os.IsNotExist(err) {
+				firstErr = E.Cause(err, "invalid certificate directory: ", directoryPath)
+			}
+			continue
+		}
+		for _, directoryEntry := range directoryEntries {
+			pemContent, err := os.ReadFile(filepath.Join(directoryPath, directoryEntry.Name()))
+			if err == nil {
+				currentPool.AppendCertsFromPEM(pemContent)
+			}
+		}
+	}
+	if firstErr != nil {
+		return firstErr
+	}
+	s.currentPool = currentPool
+	return nil
+}
+
+func readUniqueDirectoryEntries(dir string) ([]fs.DirEntry, error) {
+	files, err := os.ReadDir(dir)
+	if err != nil {
+		return nil, err
+	}
+	uniq := files[:0]
+	for _, f := range files {
+		if !isSameDirSymlink(f, dir) {
+			uniq = append(uniq, f)
+		}
+	}
+	return uniq, nil
+}
+
+func isSameDirSymlink(f fs.DirEntry, dir string) bool {
+	if f.Type()&fs.ModeSymlink == 0 {
+		return false
+	}
+	target, err := os.Readlink(filepath.Join(dir, f.Name()))
+	return err == nil && !strings.Contains(target, "/")
+}

common/conntrack/conn.go

@@ -0,0 +1,54 @@
+package conntrack
+
+import (
+	"io"
+	"net"
+
+	"github.com/sagernet/sing/common/x/list"
+)
+
+type Conn struct {
+	net.Conn
+	element *list.Element[io.Closer]
+}
+
+func NewConn(conn net.Conn) (net.Conn, error) {
+	connAccess.Lock()
+	element := openConnection.PushBack(conn)
+	connAccess.Unlock()
+	if KillerEnabled {
+		err := KillerCheck()
+		if err != nil {
+			conn.Close()
+			return nil, err
+		}
+	}
+	return &Conn{
+		Conn:    conn,
+		element: element,
+	}, nil
+}
+
+func (c *Conn) Close() error {
+	if c.element.Value != nil {
+		connAccess.Lock()
+		if c.element.Value != nil {
+			openConnection.Remove(c.element)
+			c.element.Value = nil
+		}
+		connAccess.Unlock()
+	}
+	return c.Conn.Close()
+}
+
+func (c *Conn) Upstream() any {
+	return c.Conn
+}
+
+func (c *Conn) ReaderReplaceable() bool {
+	return true
+}
+
+func (c *Conn) WriterReplaceable() bool {
+	return true
+}

common/conntrack/context.go

@@ -1,14 +0,0 @@
-package conntrack
-
-import (
-	"context"
-
-	"github.com/sagernet/sing/service"
-)
-
-func ContextWithDefaultTracker(ctx context.Context, killerEnabled bool, memoryLimit uint64) context.Context {
-	if service.FromContext[Tracker](ctx) != nil {
-		return ctx
-	}
-	return service.ContextWith[Tracker](ctx, NewDefaultTracker(killerEnabled, memoryLimit))
-}

common/conntrack/default.go

@@ -1,245 +0,0 @@
-package conntrack
-
-import (
-	"net"
-	"net/netip"
-	runtimeDebug "runtime/debug"
-	"sync"
-	"time"
-
-	"github.com/sagernet/sing/common"
-	E "github.com/sagernet/sing/common/exceptions"
-	"github.com/sagernet/sing/common/memory"
-	M "github.com/sagernet/sing/common/metadata"
-	N "github.com/sagernet/sing/common/network"
-	"github.com/sagernet/sing/common/x/list"
-)
-
-var _ Tracker = (*DefaultTracker)(nil)
-
-type DefaultTracker struct {
-	connAccess  sync.RWMutex
-	connList    list.List[net.Conn]
-	connAddress map[netip.AddrPort]netip.AddrPort
-
-	packetConnAccess  sync.RWMutex
-	packetConnList    list.List[AbstractPacketConn]
-	packetConnAddress map[netip.AddrPort]bool
-
-	pendingAccess sync.RWMutex
-	pendingList   list.List[netip.AddrPort]
-
-	killerEnabled   bool
-	memoryLimit     uint64
-	killerLastCheck time.Time
-}
-
-func NewDefaultTracker(killerEnabled bool, memoryLimit uint64) *DefaultTracker {
-	return &DefaultTracker{
-		connAddress:       make(map[netip.AddrPort]netip.AddrPort),
-		packetConnAddress: make(map[netip.AddrPort]bool),
-		killerEnabled:     killerEnabled,
-		memoryLimit:       memoryLimit,
-	}
-}
-
-func (t *DefaultTracker) NewConn(conn net.Conn) (net.Conn, error) {
-	err := t.KillerCheck()
-	if err != nil {
-		conn.Close()
-		return nil, err
-	}
-	t.connAccess.Lock()
-	element := t.connList.PushBack(conn)
-	t.connAddress[M.AddrPortFromNet(conn.LocalAddr())] = M.AddrPortFromNet(conn.RemoteAddr())
-	t.connAccess.Unlock()
-	return &Conn{
-		Conn: conn,
-		closeFunc: common.OnceFunc(func() {
-			t.removeConn(element)
-		}),
-	}, nil
-}
-
-func (t *DefaultTracker) NewConnEx(conn net.Conn) (N.CloseHandlerFunc, error) {
-	err := t.KillerCheck()
-	if err != nil {
-		conn.Close()
-		return nil, err
-	}
-	t.connAccess.Lock()
-	element := t.connList.PushBack(conn)
-	t.connAddress[M.AddrPortFromNet(conn.LocalAddr())] = M.AddrPortFromNet(conn.RemoteAddr())
-	t.connAccess.Unlock()
-	return N.OnceClose(func(it error) {
-		t.removeConn(element)
-	}), nil
-}
-
-func (t *DefaultTracker) NewPacketConn(conn net.PacketConn) (net.PacketConn, error) {
-	err := t.KillerCheck()
-	if err != nil {
-		conn.Close()
-		return nil, err
-	}
-	t.packetConnAccess.Lock()
-	element := t.packetConnList.PushBack(conn)
-	t.packetConnAddress[M.AddrPortFromNet(conn.LocalAddr())] = true
-	t.packetConnAccess.Unlock()
-	return &PacketConn{
-		PacketConn: conn,
-		closeFunc: common.OnceFunc(func() {
-			t.removePacketConn(element)
-		}),
-	}, nil
-}
-
-func (t *DefaultTracker) NewPacketConnEx(conn AbstractPacketConn) (N.CloseHandlerFunc, error) {
-	err := t.KillerCheck()
-	if err != nil {
-		conn.Close()
-		return nil, err
-	}
-	t.packetConnAccess.Lock()
-	element := t.packetConnList.PushBack(conn)
-	t.packetConnAddress[M.AddrPortFromNet(conn.LocalAddr())] = true
-	t.packetConnAccess.Unlock()
-	return N.OnceClose(func(it error) {
-		t.removePacketConn(element)
-	}), nil
-}
-
-func (t *DefaultTracker) CheckConn(source netip.AddrPort, destination netip.AddrPort) bool {
-	t.connAccess.RLock()
-	defer t.connAccess.RUnlock()
-	return t.connAddress[source] == destination
-}
-
-func (t *DefaultTracker) CheckPacketConn(source netip.AddrPort) bool {
-	t.packetConnAccess.RLock()
-	defer t.packetConnAccess.RUnlock()
-	return t.packetConnAddress[source]
-}
-
-func (t *DefaultTracker) AddPendingDestination(destination netip.AddrPort) func() {
-	t.pendingAccess.Lock()
-	defer t.pendingAccess.Unlock()
-	element := t.pendingList.PushBack(destination)
-	return func() {
-		t.pendingAccess.Lock()
-		defer t.pendingAccess.Unlock()
-		t.pendingList.Remove(element)
-	}
-}
-
-func (t *DefaultTracker) CheckDestination(destination netip.AddrPort) bool {
-	t.pendingAccess.RLock()
-	defer t.pendingAccess.RUnlock()
-	for element := t.pendingList.Front(); element != nil; element = element.Next() {
-		if element.Value == destination {
-			return true
-		}
-	}
-	return false
-}
-
-func (t *DefaultTracker) KillerCheck() error {
-	if !t.killerEnabled {
-		return nil
-	}
-	nowTime := time.Now()
-	if nowTime.Sub(t.killerLastCheck) < 3*time.Second {
-		return nil
-	}
-	t.killerLastCheck = nowTime
-	if memory.Total() > t.memoryLimit {
-		t.Close()
-		go func() {
-			time.Sleep(time.Second)
-			runtimeDebug.FreeOSMemory()
-		}()
-		return E.New("out of memory")
-	}
-	return nil
-}
-
-func (t *DefaultTracker) Count() int {
-	t.connAccess.RLock()
-	defer t.connAccess.RUnlock()
-	t.packetConnAccess.RLock()
-	defer t.packetConnAccess.RUnlock()
-	return t.connList.Len() + t.packetConnList.Len()
-}
-
-func (t *DefaultTracker) Close() {
-	t.connAccess.Lock()
-	for element := t.connList.Front(); element != nil; element = element.Next() {
-		element.Value.Close()
-	}
-	t.connList.Init()
-	t.connAccess.Unlock()
-	t.packetConnAccess.Lock()
-	for element := t.packetConnList.Front(); element != nil; element = element.Next() {
-		element.Value.Close()
-	}
-	t.packetConnList.Init()
-	t.packetConnAccess.Unlock()
-}
-
-func (t *DefaultTracker) removeConn(element *list.Element[net.Conn]) {
-	t.connAccess.Lock()
-	defer t.connAccess.Unlock()
-	delete(t.connAddress, M.AddrPortFromNet(element.Value.LocalAddr()))
-	t.connList.Remove(element)
-}
-
-func (t *DefaultTracker) removePacketConn(element *list.Element[AbstractPacketConn]) {
-	t.packetConnAccess.Lock()
-	defer t.packetConnAccess.Unlock()
-	delete(t.packetConnAddress, M.AddrPortFromNet(element.Value.LocalAddr()))
-	t.packetConnList.Remove(element)
-}
-
-type Conn struct {
-	net.Conn
-	closeFunc func()
-}
-
-func (c *Conn) Close() error {
-	c.closeFunc()
-	return c.Conn.Close()
-}
-
-func (c *Conn) Upstream() any {
-	return c.Conn
-}
-
-func (c *Conn) ReaderReplaceable() bool {
-	return true
-}
-
-func (c *Conn) WriterReplaceable() bool {
-	return true
-}
-
-type PacketConn struct {
-	net.PacketConn
-	closeFunc func()
-}
-
-func (c *PacketConn) Close() error {
-	c.closeFunc()
-	return c.PacketConn.Close()
-}
-
-func (c *PacketConn) Upstream() any {
-	return c.PacketConn
-}
-
-func (c *PacketConn) ReaderReplaceable() bool {
-	return true
-}
-
-func (c *PacketConn) WriterReplaceable() bool {
-	return true
-}

common/conntrack/killer.go

@@ -0,0 +1,35 @@
+package conntrack
+
+import (
+	runtimeDebug "runtime/debug"
+	"time"
+
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/memory"
+)
+
+var (
+	KillerEnabled   bool
+	MemoryLimit     uint64
+	killerLastCheck time.Time
+)
+
+func KillerCheck() error {
+	if !KillerEnabled {
+		return nil
+	}
+	nowTime := time.Now()
+	if nowTime.Sub(killerLastCheck) < 3*time.Second {
+		return nil
+	}
+	killerLastCheck = nowTime
+	if memory.Total() > MemoryLimit {
+		Close()
+		go func() {
+			time.Sleep(time.Second)
+			runtimeDebug.FreeOSMemory()
+		}()
+		return E.New("out of memory")
+	}
+	return nil
+}

common/conntrack/packet_conn.go

@@ -0,0 +1,55 @@
+package conntrack
+
+import (
+	"io"
+	"net"
+
+	"github.com/sagernet/sing/common/bufio"
+	"github.com/sagernet/sing/common/x/list"
+)
+
+type PacketConn struct {
+	net.PacketConn
+	element *list.Element[io.Closer]
+}
+
+func NewPacketConn(conn net.PacketConn) (net.PacketConn, error) {
+	connAccess.Lock()
+	element := openConnection.PushBack(conn)
+	connAccess.Unlock()
+	if KillerEnabled {
+		err := KillerCheck()
+		if err != nil {
+			conn.Close()
+			return nil, err
+		}
+	}
+	return &PacketConn{
+		PacketConn: conn,
+		element:    element,
+	}, nil
+}
+
+func (c *PacketConn) Close() error {
+	if c.element.Value != nil {
+		connAccess.Lock()
+		if c.element.Value != nil {
+			openConnection.Remove(c.element)
+			c.element.Value = nil
+		}
+		connAccess.Unlock()
+	}
+	return c.PacketConn.Close()
+}
+
+func (c *PacketConn) Upstream() any {
+	return bufio.NewPacketConn(c.PacketConn)
+}
+
+func (c *PacketConn) ReaderReplaceable() bool {
+	return true
+}
+
+func (c *PacketConn) WriterReplaceable() bool {
+	return true
+}

common/conntrack/track.go

@@ -0,0 +1,47 @@
+package conntrack
+
+import (
+	"io"
+	"sync"
+
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/x/list"
+)
+
+var (
+	connAccess     sync.RWMutex
+	openConnection list.List[io.Closer]
+)
+
+func Count() int {
+	if !Enabled {
+		return 0
+	}
+	return openConnection.Len()
+}
+
+func List() []io.Closer {
+	if !Enabled {
+		return nil
+	}
+	connAccess.RLock()
+	defer connAccess.RUnlock()
+	connList := make([]io.Closer, 0, openConnection.Len())
+	for element := openConnection.Front(); element != nil; element = element.Next() {
+		connList = append(connList, element.Value)
+	}
+	return connList
+}
+
+func Close() {
+	if !Enabled {
+		return
+	}
+	connAccess.Lock()
+	defer connAccess.Unlock()
+	for element := openConnection.Front(); element != nil; element = element.Next() {
+		common.Close(element.Value)
+		element.Value = nil
+	}
+	openConnection.Init()
+}

common/conntrack/track_disable.go

@@ -0,0 +1,5 @@
+//go:build !with_conntrack
+
+package conntrack
+
+const Enabled = false

common/conntrack/track_enable.go

@@ -0,0 +1,5 @@
+//go:build with_conntrack
+
+package conntrack
+
+const Enabled = true

common/conntrack/tracker.go

@@ -1,32 +0,0 @@
-package conntrack
-
-import (
-	"net"
-	"net/netip"
-	"time"
-
-	N "github.com/sagernet/sing/common/network"
-)
-
-// TODO: add to N
-type AbstractPacketConn interface {
-	Close() error
-	LocalAddr() net.Addr
-	SetDeadline(t time.Time) error
-	SetReadDeadline(t time.Time) error
-	SetWriteDeadline(t time.Time) error
-}
-
-type Tracker interface {
-	NewConn(conn net.Conn) (net.Conn, error)
-	NewPacketConn(conn net.PacketConn) (net.PacketConn, error)
-	NewConnEx(conn net.Conn) (N.CloseHandlerFunc, error)
-	NewPacketConnEx(conn AbstractPacketConn) (N.CloseHandlerFunc, error)
-	CheckConn(source netip.AddrPort, destination netip.AddrPort) bool
-	CheckPacketConn(source netip.AddrPort) bool
-	AddPendingDestination(destination netip.AddrPort) func()
-	CheckDestination(destination netip.AddrPort) bool
-	KillerCheck() error
-	Count() int
-	Close()
-}

common/dialer/default.go

@@ -28,7 +28,6 @@ var (
 )
 
 type DefaultDialer struct {
-	tracker                conntrack.Tracker
 	dialer4                tcpDialer
 	dialer6                tcpDialer
 	udpDialer4             net.Dialer
@@ -36,7 +35,6 @@ type DefaultDialer struct {
 	udpListener            net.ListenConfig
 	udpAddr4               string
 	udpAddr6               string
-	isWireGuardListener    bool
 	networkManager         adapter.NetworkManager
 	networkStrategy        *C.NetworkStrategy
 	defaultNetworkStrategy bool
@@ -47,7 +45,6 @@ type DefaultDialer struct {
 }
 
 func NewDefault(ctx context.Context, options option.DialerOptions) (*DefaultDialer, error) {
-	tracker := service.FromContext[conntrack.Tracker](ctx)
 	networkManager := service.FromContext[adapter.NetworkManager](ctx)
 	platformInterface := service.FromContext[platform.Interface](ctx)
 
@@ -185,11 +182,6 @@ func NewDefault(ctx context.Context, options option.DialerOptions) (*DefaultDial
 		}
 		setMultiPathTCP(&dialer4)
 	}
-	if options.IsWireGuardListener {
-		for _, controlFn := range WgControlFns {
-			listener.Control = control.Append(listener.Control, controlFn)
-		}
-	}
 	tcpDialer4, err := newTCPDialer(dialer4, options.TCPFastOpen)
 	if err != nil {
 		return nil, err
@@ -199,7 +191,6 @@ func NewDefault(ctx context.Context, options option.DialerOptions) (*DefaultDial
 		return nil, err
 	}
 	return &DefaultDialer{
-		tracker:                tracker,
 		dialer4:                tcpDialer4,
 		dialer6:                tcpDialer6,
 		udpDialer4:             udpDialer4,
@@ -207,7 +198,6 @@ func NewDefault(ctx context.Context, options option.DialerOptions) (*DefaultDial
 		udpListener:            listener,
 		udpAddr4:               udpAddr4,
 		udpAddr6:               udpAddr6,
-		isWireGuardListener:    options.IsWireGuardListener,
 		networkManager:         networkManager,
 		networkStrategy:        networkStrategy,
 		defaultNetworkStrategy: defaultNetworkStrategy,
@@ -222,26 +212,18 @@ func (d *DefaultDialer) DialContext(ctx context.Context, network string, address
 		return nil, E.New("invalid address")
 	}
 	if d.networkStrategy == nil {
-		if address.IsFqdn() {
-			return nil, E.New("unexpected domain destination")
-		}
-		// Since pending check is only used by ndis, it is not performed for non-windows connections which are only supported on platform clients
-		if d.tracker != nil {
-			done := d.tracker.AddPendingDestination(address.AddrPort())
-			defer done()
-		}
 		switch N.NetworkName(network) {
 		case N.NetworkUDP:
 			if !address.IsIPv6() {
-				return d.trackConn(d.udpDialer4.DialContext(ctx, network, address.String()))
+				return trackConn(d.udpDialer4.DialContext(ctx, network, address.String()))
 			} else {
-				return d.trackConn(d.udpDialer6.DialContext(ctx, network, address.String()))
+				return trackConn(d.udpDialer6.DialContext(ctx, network, address.String()))
 			}
 		}
 		if !address.IsIPv6() {
-			return d.trackConn(DialSlowContext(&d.dialer4, ctx, network, address))
+			return trackConn(DialSlowContext(&d.dialer4, ctx, network, address))
 		} else {
-			return d.trackConn(DialSlowContext(&d.dialer6, ctx, network, address))
+			return trackConn(DialSlowContext(&d.dialer6, ctx, network, address))
 		}
 	} else {
 		return d.DialParallelInterface(ctx, network, address, d.networkStrategy, d.networkType, d.fallbackNetworkType, d.networkFallbackDelay)
@@ -293,17 +275,17 @@ func (d *DefaultDialer) DialParallelInterface(ctx context.Context, network strin
 	if !fastFallback && !isPrimary {
 		d.networkLastFallback.Store(time.Now())
 	}
-	return d.trackConn(conn, nil)
+	return trackConn(conn, nil)
 }
 
 func (d *DefaultDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
 	if d.networkStrategy == nil {
 		if destination.IsIPv6() {
-			return d.trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP, d.udpAddr6))
+			return trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP, d.udpAddr6))
 		} else if destination.IsIPv4() && !destination.Addr.IsUnspecified() {
-			return d.trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP+"4", d.udpAddr4))
+			return trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP+"4", d.udpAddr4))
 		} else {
-			return d.trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP, d.udpAddr4))
+			return trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP, d.udpAddr4))
 		}
 	} else {
 		return d.ListenSerialInterfacePacket(ctx, destination, d.networkStrategy, d.networkType, d.fallbackNetworkType, d.networkFallbackDelay)
@@ -340,23 +322,23 @@ func (d *DefaultDialer) ListenSerialInterfacePacket(ctx context.Context, destina
 			return nil, err
 		}
 	}
-	return d.trackPacketConn(packetConn, nil)
+	return trackPacketConn(packetConn, nil)
 }
 
 func (d *DefaultDialer) ListenPacketCompat(network, address string) (net.PacketConn, error) {
 	return d.udpListener.ListenPacket(context.Background(), network, address)
 }
 
-func (d *DefaultDialer) trackConn(conn net.Conn, err error) (net.Conn, error) {
-	if d.tracker == nil || err != nil {
+func trackConn(conn net.Conn, err error) (net.Conn, error) {
+	if !conntrack.Enabled || err != nil {
 		return conn, err
 	}
-	return d.tracker.NewConn(conn)
+	return conntrack.NewConn(conn)
 }
 
-func (d *DefaultDialer) trackPacketConn(conn net.PacketConn, err error) (net.PacketConn, error) {
-	if err != nil {
+func trackPacketConn(conn net.PacketConn, err error) (net.PacketConn, error) {
+	if !conntrack.Enabled || err != nil {
 		return conn, err
 	}
-	return d.tracker.NewPacketConn(conn)
+	return conntrack.NewPacketConn(conn)
 }

common/dialer/detour.go

@@ -29,16 +29,18 @@ func (d *DetourDialer) Start() error {
 }
 
 func (d *DetourDialer) Dialer() (N.Dialer, error) {
-	d.initOnce.Do(func() {
-		var loaded bool
-		d.dialer, loaded = d.outboundManager.Outbound(d.detour)
-		if !loaded {
-			d.initErr = E.New("outbound detour not found: ", d.detour)
-		}
-	})
+	d.initOnce.Do(d.init)
 	return d.dialer, d.initErr
 }
 
+func (d *DetourDialer) init() {
+	var loaded bool
+	d.dialer, loaded = d.outboundManager.Outbound(d.detour)
+	if !loaded {
+		d.initErr = E.New("outbound detour not found: ", d.detour)
+	}
+}
+
 func (d *DetourDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
 	dialer, err := d.Dialer()
 	if err != nil {

common/dialer/dialer.go

@@ -8,68 +8,113 @@ import (
 
 	"github.com/sagernet/sing-box/adapter"
 	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/experimental/deprecated"
 	"github.com/sagernet/sing-box/option"
-	"github.com/sagernet/sing-dns"
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 	"github.com/sagernet/sing/service"
 )
 
-func New(ctx context.Context, options option.DialerOptions) (N.Dialer, error) {
-	if options.IsWireGuardListener {
-		return NewDefault(ctx, options)
-	}
+type Options struct {
+	Context          context.Context
+	Options          option.DialerOptions
+	RemoteIsDomain   bool
+	DirectResolver   bool
+	ResolverOnDetour bool
+}
+
+// TODO: merge with NewWithOptions
+func New(ctx context.Context, options option.DialerOptions, remoteIsDomain bool) (N.Dialer, error) {
+	return NewWithOptions(Options{
+		Context:        ctx,
+		Options:        options,
+		RemoteIsDomain: remoteIsDomain,
+	})
+}
+
+func NewWithOptions(options Options) (N.Dialer, error) {
+	dialOptions := options.Options
 	var (
 		dialer N.Dialer
 		err    error
 	)
-	if options.Detour == "" {
-		dialer, err = NewDefault(ctx, options)
-		if err != nil {
-			return nil, err
-		}
-	} else {
-		outboundManager := service.FromContext[adapter.OutboundManager](ctx)
+	if dialOptions.Detour != "" {
+		outboundManager := service.FromContext[adapter.OutboundManager](options.Context)
 		if outboundManager == nil {
 			return nil, E.New("missing outbound manager")
 		}
-		dialer = NewDetour(outboundManager, options.Detour)
-	}
-	if options.Detour == "" {
-		router := service.FromContext[adapter.Router](ctx)
-		if router != nil {
-			dialer = NewResolveDialer(
-				router,
-				dialer,
-				options.Detour == "" && !options.TCPFastOpen,
-				dns.DomainStrategy(options.DomainStrategy),
-				time.Duration(options.FallbackDelay))
+		dialer = NewDetour(outboundManager, dialOptions.Detour)
+	} else {
+		dialer, err = NewDefault(options.Context, dialOptions)
+		if err != nil {
+			return nil, err
 		}
 	}
+	if options.RemoteIsDomain && (dialOptions.Detour == "" || options.ResolverOnDetour) {
+		networkManager := service.FromContext[adapter.NetworkManager](options.Context)
+		dnsTransport := service.FromContext[adapter.DNSTransportManager](options.Context)
+		var defaultOptions adapter.NetworkOptions
+		if networkManager != nil {
+			defaultOptions = networkManager.DefaultOptions()
+		}
+		var (
+			server               string
+			dnsQueryOptions      adapter.DNSQueryOptions
+			resolveFallbackDelay time.Duration
+		)
+		if dialOptions.DomainResolver != nil && dialOptions.DomainResolver.Server != "" {
+			var transport adapter.DNSTransport
+			if !options.DirectResolver {
+				var loaded bool
+				transport, loaded = dnsTransport.Transport(dialOptions.DomainResolver.Server)
+				if !loaded {
+					return nil, E.New("domain resolver not found: " + dialOptions.DomainResolver.Server)
+				}
+			}
+			var strategy C.DomainStrategy
+			if dialOptions.DomainResolver.Strategy != option.DomainStrategy(C.DomainStrategyAsIS) {
+				strategy = C.DomainStrategy(dialOptions.DomainResolver.Strategy)
+			} else if
+			//nolint:staticcheck
+			dialOptions.DomainStrategy != option.DomainStrategy(C.DomainStrategyAsIS) {
+				//nolint:staticcheck
+				strategy = C.DomainStrategy(dialOptions.DomainStrategy)
+			}
+			server = dialOptions.DomainResolver.Server
+			dnsQueryOptions = adapter.DNSQueryOptions{
+				Transport:    transport,
+				Strategy:     strategy,
+				DisableCache: dialOptions.DomainResolver.DisableCache,
+				RewriteTTL:   dialOptions.DomainResolver.RewriteTTL,
+				ClientSubnet: dialOptions.DomainResolver.ClientSubnet.Build(netip.Prefix{}),
+			}
+			resolveFallbackDelay = time.Duration(dialOptions.FallbackDelay)
+		} else if options.DirectResolver {
+			return nil, E.New("missing domain resolver for domain server address")
+		} else if defaultOptions.DomainResolver != "" {
+			dnsQueryOptions = defaultOptions.DomainResolveOptions
+			transport, loaded := dnsTransport.Transport(defaultOptions.DomainResolver)
+			if !loaded {
+				return nil, E.New("default domain resolver not found: " + defaultOptions.DomainResolver)
+			}
+			dnsQueryOptions.Transport = transport
+			resolveFallbackDelay = time.Duration(dialOptions.FallbackDelay)
+		} else {
+			deprecated.Report(options.Context, deprecated.OptionMissingDomainResolver)
+		}
+		dialer = NewResolveDialer(
+			options.Context,
+			dialer,
+			dialOptions.Detour == "" && !dialOptions.TCPFastOpen,
+			server,
+			dnsQueryOptions,
+			resolveFallbackDelay,
+		)
+	}
 	return dialer, nil
 }
 
-func NewDirect(ctx context.Context, options option.DialerOptions) (ParallelInterfaceDialer, error) {
-	if options.Detour != "" {
-		return nil, E.New("`detour` is not supported in direct context")
-	}
-	if options.IsWireGuardListener {
-		return NewDefault(ctx, options)
-	}
-	dialer, err := NewDefault(ctx, options)
-	if err != nil {
-		return nil, err
-	}
-	return NewResolveParallelInterfaceDialer(
-		service.FromContext[adapter.Router](ctx),
-		dialer,
-		true,
-		dns.DomainStrategy(options.DomainStrategy),
-		time.Duration(options.FallbackDelay),
-	), nil
-}
-
 type ParallelInterfaceDialer interface {
 	N.Dialer
 	DialParallelInterface(ctx context.Context, network string, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error)

common/dialer/resolve.go

@@ -3,16 +3,17 @@ package dialer
 import (
 	"context"
 	"net"
-	"net/netip"
+	"sync"
 	"time"
 
 	"github.com/sagernet/sing-box/adapter"
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/log"
-	"github.com/sagernet/sing-dns"
 	"github.com/sagernet/sing/common/bufio"
+	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/service"
 )
 
 var (
@@ -20,21 +21,37 @@ var (
 	_ ParallelInterfaceDialer = (*resolveParallelNetworkDialer)(nil)
 )
 
+type ResolveDialer interface {
+	N.Dialer
+	QueryOptions() adapter.DNSQueryOptions
+}
+
+type ParallelInterfaceResolveDialer interface {
+	ParallelInterfaceDialer
+	QueryOptions() adapter.DNSQueryOptions
+}
+
 type resolveDialer struct {
+	transport     adapter.DNSTransportManager
+	router        adapter.DNSRouter
 	dialer        N.Dialer
 	parallel      bool
-	router        adapter.Router
-	strategy      dns.DomainStrategy
+	server        string
+	initOnce      sync.Once
+	initErr       error
+	queryOptions  adapter.DNSQueryOptions
 	fallbackDelay time.Duration
 }
 
-func NewResolveDialer(router adapter.Router, dialer N.Dialer, parallel bool, strategy dns.DomainStrategy, fallbackDelay time.Duration) N.Dialer {
+func NewResolveDialer(ctx context.Context, dialer N.Dialer, parallel bool, server string, queryOptions adapter.DNSQueryOptions, fallbackDelay time.Duration) ResolveDialer {
 	return &resolveDialer{
-		dialer,
-		parallel,
-		router,
-		strategy,
-		fallbackDelay,
+		transport:     service.FromContext[adapter.DNSTransportManager](ctx),
+		router:        service.FromContext[adapter.DNSRouter](ctx),
+		dialer:        dialer,
+		parallel:      parallel,
+		server:        server,
+		queryOptions:  queryOptions,
+		fallbackDelay: fallbackDelay,
 	}
 }
 
@@ -43,59 +60,68 @@ type resolveParallelNetworkDialer struct {
 	dialer ParallelInterfaceDialer
 }
 
-func NewResolveParallelInterfaceDialer(router adapter.Router, dialer ParallelInterfaceDialer, parallel bool, strategy dns.DomainStrategy, fallbackDelay time.Duration) ParallelInterfaceDialer {
+func NewResolveParallelInterfaceDialer(ctx context.Context, dialer ParallelInterfaceDialer, parallel bool, server string, queryOptions adapter.DNSQueryOptions, fallbackDelay time.Duration) ParallelInterfaceResolveDialer {
 	return &resolveParallelNetworkDialer{
 		resolveDialer{
-			dialer,
-			parallel,
-			router,
-			strategy,
-			fallbackDelay,
+			transport:     service.FromContext[adapter.DNSTransportManager](ctx),
+			router:        service.FromContext[adapter.DNSRouter](ctx),
+			dialer:        dialer,
+			parallel:      parallel,
+			server:        server,
+			queryOptions:  queryOptions,
+			fallbackDelay: fallbackDelay,
 		},
 		dialer,
 	}
 }
 
+func (d *resolveDialer) initialize() error {
+	d.initOnce.Do(d.initServer)
+	return d.initErr
+}
+
+func (d *resolveDialer) initServer() {
+	if d.server == "" {
+		return
+	}
+	transport, loaded := d.transport.Transport(d.server)
+	if !loaded {
+		d.initErr = E.New("domain resolver not found: " + d.server)
+		return
+	}
+	d.queryOptions.Transport = transport
+}
+
 func (d *resolveDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	err := d.initialize()
+	if err != nil {
+		return nil, err
+	}
 	if !destination.IsFqdn() {
 		return d.dialer.DialContext(ctx, network, destination)
 	}
-	ctx, metadata := adapter.ExtendContext(ctx)
 	ctx = log.ContextWithOverrideLevel(ctx, log.LevelDebug)
-	metadata.Destination = destination
-	metadata.Domain = ""
-	var addresses []netip.Addr
-	var err error
-	if d.strategy == dns.DomainStrategyAsIS {
-		addresses, err = d.router.LookupDefault(ctx, destination.Fqdn)
-	} else {
-		addresses, err = d.router.Lookup(ctx, destination.Fqdn, d.strategy)
-	}
+	addresses, err := d.router.Lookup(ctx, destination.Fqdn, d.queryOptions)
 	if err != nil {
 		return nil, err
 	}
 	if d.parallel {
-		return N.DialParallel(ctx, d.dialer, network, destination, addresses, d.strategy == dns.DomainStrategyPreferIPv6, d.fallbackDelay)
+		return N.DialParallel(ctx, d.dialer, network, destination, addresses, d.queryOptions.Strategy == C.DomainStrategyPreferIPv6, d.fallbackDelay)
 	} else {
 		return N.DialSerial(ctx, d.dialer, network, destination, addresses)
 	}
 }
 
 func (d *resolveDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	err := d.initialize()
+	if err != nil {
+		return nil, err
+	}
 	if !destination.IsFqdn() {
 		return d.dialer.ListenPacket(ctx, destination)
 	}
-	ctx, metadata := adapter.ExtendContext(ctx)
 	ctx = log.ContextWithOverrideLevel(ctx, log.LevelDebug)
-	metadata.Destination = destination
-	metadata.Domain = ""
-	var addresses []netip.Addr
-	var err error
-	if d.strategy == dns.DomainStrategyAsIS {
-		addresses, err = d.router.LookupDefault(ctx, destination.Fqdn)
-	} else {
-		addresses, err = d.router.Lookup(ctx, destination.Fqdn, d.strategy)
-	}
+	addresses, err := d.router.Lookup(ctx, destination.Fqdn, d.queryOptions)
 	if err != nil {
 		return nil, err
 	}
@@ -106,21 +132,24 @@ func (d *resolveDialer) ListenPacket(ctx context.Context, destination M.Socksadd
 	return bufio.NewNATPacketConn(bufio.NewPacketConn(conn), M.SocksaddrFrom(destinationAddress, destination.Port), destination), nil
 }
 
+func (d *resolveDialer) QueryOptions() adapter.DNSQueryOptions {
+	return d.queryOptions
+}
+
+func (d *resolveDialer) Upstream() any {
+	return d.dialer
+}
+
 func (d *resolveParallelNetworkDialer) DialParallelInterface(ctx context.Context, network string, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+	err := d.initialize()
+	if err != nil {
+		return nil, err
+	}
 	if !destination.IsFqdn() {
 		return d.dialer.DialContext(ctx, network, destination)
 	}
-	ctx, metadata := adapter.ExtendContext(ctx)
 	ctx = log.ContextWithOverrideLevel(ctx, log.LevelDebug)
-	metadata.Destination = destination
-	metadata.Domain = ""
-	var addresses []netip.Addr
-	var err error
-	if d.strategy == dns.DomainStrategyAsIS {
-		addresses, err = d.router.LookupDefault(ctx, destination.Fqdn)
-	} else {
-		addresses, err = d.router.Lookup(ctx, destination.Fqdn, d.strategy)
-	}
+	addresses, err := d.router.Lookup(ctx, destination.Fqdn, d.queryOptions)
 	if err != nil {
 		return nil, err
 	}
@@ -128,30 +157,28 @@ func (d *resolveParallelNetworkDialer) DialParallelInterface(ctx context.Context
 		fallbackDelay = d.fallbackDelay
 	}
 	if d.parallel {
-		return DialParallelNetwork(ctx, d.dialer, network, destination, addresses, d.strategy == dns.DomainStrategyPreferIPv6, strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
+		return DialParallelNetwork(ctx, d.dialer, network, destination, addresses, d.queryOptions.Strategy == C.DomainStrategyPreferIPv6, strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
 	} else {
 		return DialSerialNetwork(ctx, d.dialer, network, destination, addresses, strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
 	}
 }
 
 func (d *resolveParallelNetworkDialer) ListenSerialInterfacePacket(ctx context.Context, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, error) {
+	err := d.initialize()
+	if err != nil {
+		return nil, err
+	}
 	if !destination.IsFqdn() {
 		return d.dialer.ListenPacket(ctx, destination)
 	}
-	ctx, metadata := adapter.ExtendContext(ctx)
 	ctx = log.ContextWithOverrideLevel(ctx, log.LevelDebug)
-	metadata.Destination = destination
-	metadata.Domain = ""
-	var addresses []netip.Addr
-	var err error
-	if d.strategy == dns.DomainStrategyAsIS {
-		addresses, err = d.router.LookupDefault(ctx, destination.Fqdn)
-	} else {
-		addresses, err = d.router.Lookup(ctx, destination.Fqdn, d.strategy)
-	}
+	addresses, err := d.router.Lookup(ctx, destination.Fqdn, d.queryOptions)
 	if err != nil {
 		return nil, err
 	}
+	if fallbackDelay == 0 {
+		fallbackDelay = d.fallbackDelay
+	}
 	conn, destinationAddress, err := ListenSerialNetworkPacket(ctx, d.dialer, destination, addresses, strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
 	if err != nil {
 		return nil, err
@@ -159,6 +186,10 @@ func (d *resolveParallelNetworkDialer) ListenSerialInterfacePacket(ctx context.C
 	return bufio.NewNATPacketConn(bufio.NewPacketConn(conn), M.SocksaddrFrom(destinationAddress, destination.Port), destination), nil
 }
 
-func (d *resolveDialer) Upstream() any {
+func (d *resolveParallelNetworkDialer) QueryOptions() adapter.DNSQueryOptions {
+	return d.queryOptions
+}
+
+func (d *resolveParallelNetworkDialer) Upstream() any {
 	return d.dialer
 }

common/dialer/router.go

@@ -7,24 +7,27 @@ import (
 	"github.com/sagernet/sing-box/adapter"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/service"
 )
 
 type DefaultOutboundDialer struct {
-	outboundManager adapter.OutboundManager
+	outbound adapter.OutboundManager
 }
 
-func NewDefaultOutbound(outboundManager adapter.OutboundManager) N.Dialer {
-	return &DefaultOutboundDialer{outboundManager: outboundManager}
+func NewDefaultOutbound(ctx context.Context) N.Dialer {
+	return &DefaultOutboundDialer{
+		outbound: service.FromContext[adapter.OutboundManager](ctx),
+	}
 }
 
 func (d *DefaultOutboundDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	return d.outboundManager.Default().DialContext(ctx, network, destination)
+	return d.outbound.Default().DialContext(ctx, network, destination)
 }
 
 func (d *DefaultOutboundDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	return d.outboundManager.Default().ListenPacket(ctx, destination)
+	return d.outbound.Default().ListenPacket(ctx, destination)
 }
 
 func (d *DefaultOutboundDialer) Upstream() any {
-	return d.outboundManager.Default()
+	return d.outbound.Default()
 }

common/process/searcher.go

@@ -23,6 +23,7 @@ type Config struct {
 }
 
 type Info struct {
+	ProcessID   uint32
 	ProcessPath string
 	PackageName string
 	User        string

common/process/searcher_windows.go

@@ -2,14 +2,11 @@ package process
 
 import (
 	"context"
-	"fmt"
 	"net/netip"
-	"os"
 	"syscall"
-	"unsafe"
 
 	E "github.com/sagernet/sing/common/exceptions"
-	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/winiphlpapi"
 
 	"golang.org/x/sys/windows"
 )
@@ -26,209 +23,39 @@ func NewSearcher(_ Config) (Searcher, error) {
 	return &windowsSearcher{}, nil
 }
 
-var (
-	modiphlpapi                    = windows.NewLazySystemDLL("iphlpapi.dll")
-	procGetExtendedTcpTable        = modiphlpapi.NewProc("GetExtendedTcpTable")
-	procGetExtendedUdpTable        = modiphlpapi.NewProc("GetExtendedUdpTable")
-	modkernel32                    = windows.NewLazySystemDLL("kernel32.dll")
-	procQueryFullProcessImageNameW = modkernel32.NewProc("QueryFullProcessImageNameW")
-)
-
 func initWin32API() error {
-	err := modiphlpapi.Load()
-	if err != nil {
-		return E.Cause(err, "load iphlpapi.dll")
-	}
-
-	err = procGetExtendedTcpTable.Find()
-	if err != nil {
-		return E.Cause(err, "load iphlpapi::GetExtendedTcpTable")
-	}
-
-	err = procGetExtendedUdpTable.Find()
-	if err != nil {
-		return E.Cause(err, "load iphlpapi::GetExtendedUdpTable")
-	}
-
-	err = modkernel32.Load()
-	if err != nil {
-		return E.Cause(err, "load kernel32.dll")
-	}
-
-	err = procQueryFullProcessImageNameW.Find()
-	if err != nil {
-		return E.Cause(err, "load kernel32::QueryFullProcessImageNameW")
-	}
-
-	return nil
+	return winiphlpapi.LoadExtendedTable()
 }
 
 func (s *windowsSearcher) FindProcessInfo(ctx context.Context, network string, source netip.AddrPort, destination netip.AddrPort) (*Info, error) {
-	processName, err := findProcessName(network, source.Addr(), int(source.Port()))
+	pid, err := winiphlpapi.FindPid(network, source)
 	if err != nil {
 		return nil, err
 	}
-	return &Info{ProcessPath: processName, UserId: -1}, nil
-}
-
-func findProcessName(network string, ip netip.Addr, srcPort int) (string, error) {
-	family := windows.AF_INET
-	if ip.Is6() {
-		family = windows.AF_INET6
-	}
-
-	const (
-		tcpTablePidConn = 4
-		udpTablePid     = 1
-	)
-
-	var class int
-	var fn uintptr
-	switch network {
-	case N.NetworkTCP:
-		fn = procGetExtendedTcpTable.Addr()
-		class = tcpTablePidConn
-	case N.NetworkUDP:
-		fn = procGetExtendedUdpTable.Addr()
-		class = udpTablePid
-	default:
-		return "", os.ErrInvalid
-	}
-
-	buf, err := getTransportTable(fn, family, class)
+	path, err := getProcessPath(pid)
 	if err != nil {
-		return "", err
+		return &Info{ProcessID: pid, UserId: -1}, err
 	}
-
-	s := newSearcher(family == windows.AF_INET, network == N.NetworkTCP)
-
-	pid, err := s.Search(buf, ip, uint16(srcPort))
-	if err != nil {
-		return "", err
-	}
-	return getExecPathFromPID(pid)
+	return &Info{ProcessID: pid, ProcessPath: path, UserId: -1}, nil
 }
 
-type searcher struct {
-	itemSize int
-	port     int
-	ip       int
-	ipSize   int
-	pid      int
-	tcpState int
-}
-
-func (s *searcher) Search(b []byte, ip netip.Addr, port uint16) (uint32, error) {
-	n := int(readNativeUint32(b[:4]))
-	itemSize := s.itemSize
-	for i := 0; i < n; i++ {
-		row := b[4+itemSize*i : 4+itemSize*(i+1)]
-
-		if s.tcpState >= 0 {
-			tcpState := readNativeUint32(row[s.tcpState : s.tcpState+4])
-			// MIB_TCP_STATE_ESTAB, only check established connections for TCP
-			if tcpState != 5 {
-				continue
-			}
-		}
-
-		// according to MSDN, only the lower 16 bits of dwLocalPort are used and the port number is in network endian.
-		// this field can be illustrated as follows depends on different machine endianess:
-		//     little endian: [ MSB LSB  0   0  ]   interpret as native uint32 is ((LSB<<8)|MSB)
-		//       big  endian: [  0   0  MSB LSB ]   interpret as native uint32 is ((MSB<<8)|LSB)
-		// so we need an syscall.Ntohs on the lower 16 bits after read the port as native uint32
-		srcPort := syscall.Ntohs(uint16(readNativeUint32(row[s.port : s.port+4])))
-		if srcPort != port {
-			continue
-		}
-
-		srcIP, _ := netip.AddrFromSlice(row[s.ip : s.ip+s.ipSize])
-		// windows binds an unbound udp socket to 0.0.0.0/[::] while first sendto
-		if ip != srcIP && (!srcIP.IsUnspecified() || s.tcpState != -1) {
-			continue
-		}
-
-		pid := readNativeUint32(row[s.pid : s.pid+4])
-		return pid, nil
-	}
-	return 0, ErrNotFound
-}
-
-func newSearcher(isV4, isTCP bool) *searcher {
-	var itemSize, port, ip, ipSize, pid int
-	tcpState := -1
-	switch {
-	case isV4 && isTCP:
-		// struct MIB_TCPROW_OWNER_PID
-		itemSize, port, ip, ipSize, pid, tcpState = 24, 8, 4, 4, 20, 0
-	case isV4 && !isTCP:
-		// struct MIB_UDPROW_OWNER_PID
-		itemSize, port, ip, ipSize, pid = 12, 4, 0, 4, 8
-	case !isV4 && isTCP:
-		// struct MIB_TCP6ROW_OWNER_PID
-		itemSize, port, ip, ipSize, pid, tcpState = 56, 20, 0, 16, 52, 48
-	case !isV4 && !isTCP:
-		// struct MIB_UDP6ROW_OWNER_PID
-		itemSize, port, ip, ipSize, pid = 28, 20, 0, 16, 24
-	}
-
-	return &searcher{
-		itemSize: itemSize,
-		port:     port,
-		ip:       ip,
-		ipSize:   ipSize,
-		pid:      pid,
-		tcpState: tcpState,
-	}
-}
-
-func getTransportTable(fn uintptr, family int, class int) ([]byte, error) {
-	for size, buf := uint32(8), make([]byte, 8); ; {
-		ptr := unsafe.Pointer(&buf[0])
-		err, _, _ := syscall.SyscallN(fn, uintptr(ptr), uintptr(unsafe.Pointer(&size)), 0, uintptr(family), uintptr(class), 0)
-
-		switch err {
-		case 0:
-			return buf, nil
-		case uintptr(syscall.ERROR_INSUFFICIENT_BUFFER):
-			buf = make([]byte, size)
-		default:
-			return nil, fmt.Errorf("syscall error: %d", err)
-		}
-	}
-}
-
-func readNativeUint32(b []byte) uint32 {
-	return *(*uint32)(unsafe.Pointer(&b[0]))
-}
-
-func getExecPathFromPID(pid uint32) (string, error) {
-	// kernel process starts with a colon in order to distinguish with normal processes
+func getProcessPath(pid uint32) (string, error) {
 	switch pid {
 	case 0:
-		// reserved pid for system idle process
 		return ":System Idle Process", nil
 	case 4:
-		// reserved pid for windows kernel image
 		return ":System", nil
 	}
-	h, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, pid)
+	handle, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, pid)
 	if err != nil {
 		return "", err
 	}
-	defer windows.CloseHandle(h)
-
+	defer windows.CloseHandle(handle)
+	size := uint32(syscall.MAX_LONG_PATH)
 	buf := make([]uint16, syscall.MAX_LONG_PATH)
-	size := uint32(len(buf))
-	r1, _, err := syscall.SyscallN(
-		procQueryFullProcessImageNameW.Addr(),
-		uintptr(h),
-		uintptr(0),
-		uintptr(unsafe.Pointer(&buf[0])),
-		uintptr(unsafe.Pointer(&size)),
-	)
-	if r1 == 0 {
+	err = windows.QueryFullProcessImageName(handle, 0, &buf[0], &size)
+	if err != nil {
 		return "", err
 	}
-	return syscall.UTF16ToString(buf[:size]), nil
+	return windows.UTF16ToString(buf[:size]), nil
 }

common/settings/time_stub.go

@@ -1,12 +0,0 @@
-//go:build !(windows || linux || darwin)
-
-package settings
-
-import (
-	"os"
-	"time"
-)
-
-func SetSystemTime(nowTime time.Time) error {
-	return os.ErrInvalid
-}

common/settings/time_unix.go

@@ -1,14 +0,0 @@
-//go:build linux || darwin
-
-package settings
-
-import (
-	"time"
-
-	"golang.org/x/sys/unix"
-)
-
-func SetSystemTime(nowTime time.Time) error {
-	timeVal := unix.NsecToTimeval(nowTime.UnixNano())
-	return unix.Settimeofday(&timeVal)
-}

common/settings/time_windows.go

@@ -1,32 +0,0 @@
-package settings
-
-import (
-	"time"
-	"unsafe"
-
-	"golang.org/x/sys/windows"
-)
-
-func SetSystemTime(nowTime time.Time) error {
-	var systemTime windows.Systemtime
-	systemTime.Year = uint16(nowTime.Year())
-	systemTime.Month = uint16(nowTime.Month())
-	systemTime.Day = uint16(nowTime.Day())
-	systemTime.Hour = uint16(nowTime.Hour())
-	systemTime.Minute = uint16(nowTime.Minute())
-	systemTime.Second = uint16(nowTime.Second())
-	systemTime.Milliseconds = uint16(nowTime.UnixMilli() - nowTime.Unix()*1000)
-
-	dllKernel32 := windows.NewLazySystemDLL("kernel32.dll")
-	proc := dllKernel32.NewProc("SetSystemTime")
-
-	_, _, err := proc.Call(
-		uintptr(unsafe.Pointer(&systemTime)),
-	)
-
-	if err != nil && err.Error() != "The operation completed successfully." {
-		return err
-	}
-
-	return nil
-}

common/tls/ech_client.go

@@ -15,8 +15,8 @@ import (
 
 	cftls "github.com/sagernet/cloudflare-tls"
 	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/dns"
 	"github.com/sagernet/sing-box/option"
-	"github.com/sagernet/sing-dns"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/ntp"
 	"github.com/sagernet/sing/service"
@@ -100,6 +100,7 @@ func NewECHClient(ctx context.Context, serverAddress string, options option.Outb
 
 	var tlsConfig cftls.Config
 	tlsConfig.Time = ntp.TimeFuncFromContext(ctx)
+	tlsConfig.RootCAs = adapter.RootPoolFromContext(ctx)
 	if options.DisableSNI {
 		tlsConfig.ServerName = "127.0.0.1"
 	} else {
@@ -215,7 +216,7 @@ func fetchECHClientConfig(ctx context.Context) func(_ context.Context, serverNam
 				},
 			},
 		}
-		response, err := service.FromContext[adapter.Router](ctx).Exchange(ctx, message)
+		response, err := service.FromContext[adapter.DNSRouter](ctx).Exchange(ctx, message, adapter.DNSQueryOptions{})
 		if err != nil {
 			return nil, err
 		}

common/tls/ech_server.go

@@ -90,7 +90,7 @@ func (c *echServerConfig) startWatcher() error {
 		Callback: func(path string) {
 			err := c.credentialsUpdated(path)
 			if err != nil {
-				c.logger.Error(E.Cause(err, "reload credentials from ", path))
+				c.logger.Error(E.Cause(err, "reload credentials"))
 			}
 		},
 	})

common/tls/mkcert.go

@@ -11,8 +11,8 @@ import (
 	"time"
 )
 
-func GenerateCertificate(timeFunc func() time.Time, serverName string) (*tls.Certificate, error) {
-	privateKeyPem, publicKeyPem, err := GenerateKeyPair(timeFunc, serverName, timeFunc().Add(time.Hour))
+func GenerateKeyPair(parent *x509.Certificate, parentKey any, timeFunc func() time.Time, serverName string) (*tls.Certificate, error) {
+	privateKeyPem, publicKeyPem, err := GenerateCertificate(parent, parentKey, timeFunc, serverName, timeFunc().Add(time.Hour))
 	if err != nil {
 		return nil, err
 	}
@@ -23,7 +23,7 @@ func GenerateCertificate(timeFunc func() time.Time, serverName string) (*tls.Cer
 	return &certificate, err
 }
 
-func GenerateKeyPair(timeFunc func() time.Time, serverName string, expire time.Time) (privateKeyPem []byte, publicKeyPem []byte, err error) {
+func GenerateCertificate(parent *x509.Certificate, parentKey any, timeFunc func() time.Time, serverName string, expire time.Time) (privateKeyPem []byte, publicKeyPem []byte, err error) {
 	if timeFunc == nil {
 		timeFunc = time.Now
 	}
@@ -47,7 +47,11 @@ func GenerateKeyPair(timeFunc func() time.Time, serverName string, expire time.T
 		},
 		DNSNames: []string{serverName},
 	}
-	publicDer, err := x509.CreateCertificate(rand.Reader, template, template, key.Public(), key)
+	if parent == nil {
+		parent = template
+		parentKey = key
+	}
+	publicDer, err := x509.CreateCertificate(rand.Reader, template, parent, key.Public(), parentKey)
 	if err != nil {
 		return
 	}

common/tls/reality_client.go

@@ -27,9 +27,11 @@ import (
 	"time"
 	"unsafe"
 
+	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing/common/debug"
 	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/ntp"
 	aTLS "github.com/sagernet/sing/common/tls"
 	utls "github.com/sagernet/utls"
 
@@ -40,6 +42,7 @@ import (
 var _ ConfigCompat = (*RealityClientConfig)(nil)
 
 type RealityClientConfig struct {
+	ctx       context.Context
 	uClient   *UTLSClientConfig
 	publicKey []byte
 	shortID   [8]byte
@@ -70,7 +73,7 @@ func NewRealityClient(ctx context.Context, serverAddress string, options option.
 	if decodedLen > 8 {
 		return nil, E.New("invalid short_id")
 	}
-	return &RealityClientConfig{uClient, publicKey, shortID}, nil
+	return &RealityClientConfig{ctx, uClient, publicKey, shortID}, nil
 }
 
 func (e *RealityClientConfig) ServerName() string {
@@ -180,20 +183,24 @@ func (e *RealityClientConfig) ClientHandshake(ctx context.Context, conn net.Conn
 	}
 
 	if !verifier.verified {
-		go realityClientFallback(uConn, e.uClient.ServerName(), e.uClient.id)
+		go realityClientFallback(e.ctx, uConn, e.uClient.ServerName(), e.uClient.id)
 		return nil, E.New("reality verification failed")
 	}
 
-	return &utlsConnWrapper{uConn}, nil
+	return &realityClientConnWrapper{uConn}, nil
 }
 
-func realityClientFallback(uConn net.Conn, serverName string, fingerprint utls.ClientHelloID) {
+func realityClientFallback(ctx context.Context, uConn net.Conn, serverName string, fingerprint utls.ClientHelloID) {
 	defer uConn.Close()
 	client := &http.Client{
 		Transport: &http2.Transport{
 			DialTLSContext: func(ctx context.Context, network, addr string, config *tls.Config) (net.Conn, error) {
 				return uConn, nil
 			},
+			TLSClientConfig: &tls.Config{
+				Time:    ntp.TimeFuncFromContext(ctx),
+				RootCAs: adapter.RootPoolFromContext(ctx),
+			},
 		},
 	}
 	request, _ := http.NewRequest("GET", "https://"+serverName, nil)
@@ -213,6 +220,7 @@ func (e *RealityClientConfig) SetSessionIDGenerator(generator func(clientHello [
 
 func (e *RealityClientConfig) Clone() Config {
 	return &RealityClientConfig{
+		e.ctx,
 		e.uClient.Clone().(*UTLSClientConfig),
 		e.publicKey,
 		e.shortID,
@@ -249,3 +257,36 @@ func (c *realityVerifier) VerifyPeerCertificate(rawCerts [][]byte, verifiedChain
 	}
 	return nil
 }
+
+type realityClientConnWrapper struct {
+	*utls.UConn
+}
+
+func (c *realityClientConnWrapper) ConnectionState() tls.ConnectionState {
+	state := c.Conn.ConnectionState()
+	//nolint:staticcheck
+	return tls.ConnectionState{
+		Version:                     state.Version,
+		HandshakeComplete:           state.HandshakeComplete,
+		DidResume:                   state.DidResume,
+		CipherSuite:                 state.CipherSuite,
+		NegotiatedProtocol:          state.NegotiatedProtocol,
+		NegotiatedProtocolIsMutual:  state.NegotiatedProtocolIsMutual,
+		ServerName:                  state.ServerName,
+		PeerCertificates:            state.PeerCertificates,
+		VerifiedChains:              state.VerifiedChains,
+		SignedCertificateTimestamps: state.SignedCertificateTimestamps,
+		OCSPResponse:                state.OCSPResponse,
+		TLSUnique:                   state.TLSUnique,
+	}
+}
+
+func (c *realityClientConnWrapper) Upstream() any {
+	return c.UConn
+}
+
+// Due to low implementation quality, the reality server intercepted half close and caused memory leaks.
+// We fixed it by calling Close() directly.
+func (c *realityClientConnWrapper) CloseWrite() error {
+	return c.Close()
+}

common/tls/reality_server.go

@@ -101,7 +101,7 @@ func NewRealityServer(ctx context.Context, logger log.Logger, options option.Inb
 		tlsConfig.ShortIds[shortID] = true
 	}
 
-	handshakeDialer, err := dialer.New(ctx, options.Reality.Handshake.DialerOptions)
+	handshakeDialer, err := dialer.New(ctx, options.Reality.Handshake.DialerOptions, options.Reality.Handshake.ServerIsDomain())
 	if err != nil {
 		return nil, err
 	}
@@ -194,3 +194,9 @@ func (c *realityConnWrapper) ConnectionState() ConnectionState {
 func (c *realityConnWrapper) Upstream() any {
 	return c.Conn
 }
+
+// Due to low implementation quality, the reality server intercepted half close and caused memory leaks.
+// We fixed it by calling Close() directly.
+func (c *realityConnWrapper) CloseWrite() error {
+	return c.Close()
+}

common/tls/std_client.go

@@ -5,10 +5,10 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"net"
-	"net/netip"
 	"os"
 	"strings"
 
+	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/option"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/ntp"
@@ -51,9 +51,7 @@ func NewSTDClient(ctx context.Context, serverAddress string, options option.Outb
 	if options.ServerName != "" {
 		serverName = options.ServerName
 	} else if serverAddress != "" {
-		if _, err := netip.ParseAddr(serverName); err != nil {
-			serverName = serverAddress
-		}
+		serverName = serverAddress
 	}
 	if serverName == "" && !options.Insecure {
 		return nil, E.New("missing server_name or insecure=true")
@@ -61,6 +59,7 @@ func NewSTDClient(ctx context.Context, serverAddress string, options option.Outb
 
 	var tlsConfig tls.Config
 	tlsConfig.Time = ntp.TimeFuncFromContext(ctx)
+	tlsConfig.RootCAs = adapter.RootPoolFromContext(ctx)
 	if options.DisableSNI {
 		tlsConfig.ServerName = "127.0.0.1"
 	} else {

common/tls/std_server.go

@@ -99,7 +99,7 @@ func (c *STDServerConfig) startWatcher() error {
 		Callback: func(path string) {
 			err := c.certificateUpdated(path)
 			if err != nil {
-				c.logger.Error(err)
+				c.logger.Error(E.Cause(err, "reload certificate"))
 			}
 		},
 	})
@@ -222,7 +222,7 @@ func NewSTDServer(ctx context.Context, logger log.Logger, options option.Inbound
 		}
 		if certificate == nil && key == nil && options.Insecure {
 			tlsConfig.GetCertificate = func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
-				return GenerateCertificate(ntp.TimeFuncFromContext(ctx), info.ServerName)
+				return GenerateKeyPair(nil, nil, ntp.TimeFuncFromContext(ctx), info.ServerName)
 			}
 		} else {
 			if certificate == nil {

common/tls/utls_client.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/option"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/ntp"
@@ -130,6 +131,7 @@ func NewUTLSClient(ctx context.Context, serverAddress string, options option.Out
 
 	var tlsConfig utls.Config
 	tlsConfig.Time = ntp.TimeFuncFromContext(ctx)
+	tlsConfig.RootCAs = adapter.RootPoolFromContext(ctx)
 	if options.DisableSNI {
 		tlsConfig.ServerName = "127.0.0.1"
 	} else {

common/tlsfragment/conn.go

@@ -0,0 +1,107 @@
+package tf
+
+import (
+	"context"
+	"math/rand"
+	"net"
+	"strings"
+	"time"
+
+	N "github.com/sagernet/sing/common/network"
+
+	"golang.org/x/net/publicsuffix"
+)
+
+type Conn struct {
+	net.Conn
+	tcpConn            *net.TCPConn
+	ctx                context.Context
+	firstPacketWritten bool
+	fallbackDelay      time.Duration
+}
+
+func NewConn(conn net.Conn, ctx context.Context, fallbackDelay time.Duration) (*Conn, error) {
+	tcpConn, _ := N.UnwrapReader(conn).(*net.TCPConn)
+	return &Conn{
+		Conn:          conn,
+		tcpConn:       tcpConn,
+		ctx:           ctx,
+		fallbackDelay: fallbackDelay,
+	}, nil
+}
+
+func (c *Conn) Write(b []byte) (n int, err error) {
+	if !c.firstPacketWritten {
+		defer func() {
+			c.firstPacketWritten = true
+		}()
+		serverName := indexTLSServerName(b)
+		if serverName != nil {
+			if c.tcpConn != nil {
+				err = c.tcpConn.SetNoDelay(true)
+				if err != nil {
+					return
+				}
+			}
+			splits := strings.Split(serverName.ServerName, ".")
+			currentIndex := serverName.Index
+			if publicSuffix := publicsuffix.List.PublicSuffix(serverName.ServerName); publicSuffix != "" {
+				splits = splits[:len(splits)-strings.Count(serverName.ServerName, ".")]
+			}
+			if len(splits) > 1 && splits[0] == "..." {
+				currentIndex += len(splits[0]) + 1
+				splits = splits[1:]
+			}
+			var splitIndexes []int
+			for i, split := range splits {
+				splitAt := rand.Intn(len(split))
+				splitIndexes = append(splitIndexes, currentIndex+splitAt)
+				currentIndex += len(split)
+				if i != len(splits)-1 {
+					currentIndex++
+				}
+			}
+			for i := 0; i <= len(splitIndexes); i++ {
+				var payload []byte
+				if i == 0 {
+					payload = b[:splitIndexes[i]]
+				} else if i == len(splitIndexes) {
+					payload = b[splitIndexes[i-1]:]
+				} else {
+					payload = b[splitIndexes[i-1]:splitIndexes[i]]
+				}
+				if c.tcpConn != nil && i != len(splitIndexes) {
+					err = writeAndWaitAck(c.ctx, c.tcpConn, payload, c.fallbackDelay)
+					if err != nil {
+						return
+					}
+				} else {
+					_, err = c.Conn.Write(payload)
+					if err != nil {
+						return
+					}
+				}
+			}
+			if c.tcpConn != nil {
+				err = c.tcpConn.SetNoDelay(false)
+				if err != nil {
+					return
+				}
+			}
+			return len(b), nil
+		}
+	}
+	return c.Conn.Write(b)
+}
+
+func (c *Conn) ReaderReplaceable() bool {
+	return true
+}
+
+func (c *Conn) WriterReplaceable() bool {
+	return c.firstPacketWritten
+}
+
+func (c *Conn) Upstream() any {
+	return c.Conn
+}

common/tlsfragment/index.go

@@ -0,0 +1,131 @@
+package tf
+
+import (
+	"encoding/binary"
+)
+
+const (
+	recordLayerHeaderLen    int    = 5
+	handshakeHeaderLen      int    = 6
+	randomDataLen           int    = 32
+	sessionIDHeaderLen      int    = 1
+	cipherSuiteHeaderLen    int    = 2
+	compressMethodHeaderLen int    = 1
+	extensionsHeaderLen     int    = 2
+	extensionHeaderLen      int    = 4
+	sniExtensionHeaderLen   int    = 5
+	contentType             uint8  = 22
+	handshakeType           uint8  = 1
+	sniExtensionType        uint16 = 0
+	sniNameDNSHostnameType  uint8  = 0
+	tlsVersionBitmask       uint16 = 0xFFFC
+	tls13                   uint16 = 0x0304
+)
+
+type myServerName struct {
+	Index      int
+	Length     int
+	ServerName string
+}
+
+func indexTLSServerName(payload []byte) *myServerName {
+	if len(payload) < recordLayerHeaderLen || payload[0] != contentType {
+		return nil
+	}
+	segmentLen := binary.BigEndian.Uint16(payload[3:5])
+	if len(payload) < recordLayerHeaderLen+int(segmentLen) {
+		return nil
+	}
+	serverName := indexTLSServerNameFromHandshake(payload[recordLayerHeaderLen : recordLayerHeaderLen+int(segmentLen)])
+	if serverName == nil {
+		return nil
+	}
+	serverName.Length += recordLayerHeaderLen
+	return serverName
+}
+
+func indexTLSServerNameFromHandshake(hs []byte) *myServerName {
+	if len(hs) < handshakeHeaderLen+randomDataLen+sessionIDHeaderLen {
+		return nil
+	}
+	if hs[0] != handshakeType {
+		return nil
+	}
+	handshakeLen := uint32(hs[1])<<16 | uint32(hs[2])<<8 | uint32(hs[3])
+	if len(hs[4:]) != int(handshakeLen) {
+		return nil
+	}
+	tlsVersion := uint16(hs[4])<<8 | uint16(hs[5])
+	if tlsVersion&tlsVersionBitmask != 0x0300 && tlsVersion != tls13 {
+		return nil
+	}
+	sessionIDLen := hs[38]
+	if len(hs) < handshakeHeaderLen+randomDataLen+sessionIDHeaderLen+int(sessionIDLen) {
+		return nil
+	}
+	cs := hs[handshakeHeaderLen+randomDataLen+sessionIDHeaderLen+int(sessionIDLen):]
+	if len(cs) < cipherSuiteHeaderLen {
+		return nil
+	}
+	csLen := uint16(cs[0])<<8 | uint16(cs[1])
+	if len(cs) < cipherSuiteHeaderLen+int(csLen)+compressMethodHeaderLen {
+		return nil
+	}
+	compressMethodLen := uint16(cs[cipherSuiteHeaderLen+int(csLen)])
+	if len(cs) < cipherSuiteHeaderLen+int(csLen)+compressMethodHeaderLen+int(compressMethodLen) {
+		return nil
+	}
+	currentIndex := cipherSuiteHeaderLen + int(csLen) + compressMethodHeaderLen + int(compressMethodLen)
+	serverName := indexTLSServerNameFromExtensions(cs[currentIndex:])
+	if serverName == nil {
+		return nil
+	}
+	serverName.Index += currentIndex
+	return serverName
+}
+
+func indexTLSServerNameFromExtensions(exs []byte) *myServerName {
+	if len(exs) == 0 {
+		return nil
+	}
+	if len(exs) < extensionsHeaderLen {
+		return nil
+	}
+	exsLen := uint16(exs[0])<<8 | uint16(exs[1])
+	exs = exs[extensionsHeaderLen:]
+	if len(exs) < int(exsLen) {
+		return nil
+	}
+	for currentIndex := extensionsHeaderLen; len(exs) > 0; {
+		if len(exs) < extensionHeaderLen {
+			return nil
+		}
+		exType := uint16(exs[0])<<8 | uint16(exs[1])
+		exLen := uint16(exs[2])<<8 | uint16(exs[3])
+		if len(exs) < extensionHeaderLen+int(exLen) {
+			return nil
+		}
+		sex := exs[extensionHeaderLen : extensionHeaderLen+int(exLen)]
+
+		switch exType {
+		case sniExtensionType:
+			if len(sex) < sniExtensionHeaderLen {
+				return nil
+			}
+			sniType := sex[2]
+			if sniType != sniNameDNSHostnameType {
+				return nil
+			}
+			sniLen := uint16(sex[3])<<8 | uint16(sex[4])
+			sex = sex[sniExtensionHeaderLen:]
+			return &myServerName{
+				Index:      currentIndex + extensionHeaderLen + sniExtensionHeaderLen,
+				Length:     int(sniLen),
+				ServerName: string(sex),
+			}
+		}
+		exs = exs[4+exLen:]
+		currentIndex += 4 + int(exLen)
+	}
+	return nil
+}

common/tlsfragment/wait_darwin.go

@@ -0,0 +1,93 @@
+package tf
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/sagernet/sing/common/control"
+
+	"golang.org/x/sys/unix"
+)
+
+/*
+const tcpMaxNotifyAck = 10
+
+type tcpNotifyAckID uint32
+
+	type tcpNotifyAckComplete struct {
+		NotifyPending       uint32
+		NotifyCompleteCount uint32
+		NotifyCompleteID    [tcpMaxNotifyAck]tcpNotifyAckID
+	}
+
+var sizeOfTCPNotifyAckComplete = int(unsafe.Sizeof(tcpNotifyAckComplete{}))
+
+	func getsockoptTCPNotifyAckComplete(fd, level, opt int) (*tcpNotifyAckComplete, error) {
+		var value tcpNotifyAckComplete
+		vallen := uint32(sizeOfTCPNotifyAckComplete)
+		err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+		return &value, err
+	}
+
+//go:linkname getsockopt golang.org/x/sys/unix.getsockopt
+func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *uint32) error
+
+	func waitAck(ctx context.Context, conn *net.TCPConn, _ time.Duration) error {
+		const TCP_NOTIFY_ACKNOWLEDGEMENT = 0x212
+		return control.Conn(conn, func(fd uintptr) error {
+			err := unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, TCP_NOTIFY_ACKNOWLEDGEMENT, 1)
+			if err != nil {
+				if errors.Is(err, unix.EINVAL) {
+					return waitAckFallback(ctx, conn, 0)
+				}
+				return err
+			}
+			for {
+				select {
+				case <-ctx.Done():
+					return ctx.Err()
+				default:
+				}
+				var ackComplete *tcpNotifyAckComplete
+				ackComplete, err = getsockoptTCPNotifyAckComplete(int(fd), unix.IPPROTO_TCP, TCP_NOTIFY_ACKNOWLEDGEMENT)
+				if err != nil {
+					return err
+				}
+				if ackComplete.NotifyPending == 0 {
+					return nil
+				}
+				time.Sleep(10 * time.Millisecond)
+			}
+		})
+	}
+*/
+
+func writeAndWaitAck(ctx context.Context, conn *net.TCPConn, payload []byte, fallbackDelay time.Duration) error {
+	_, err := conn.Write(payload)
+	if err != nil {
+		return err
+	}
+	return control.Conn(conn, func(fd uintptr) error {
+		start := time.Now()
+		for {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+			unacked, err := unix.GetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_NWRITE)
+			if err != nil {
+				return err
+			}
+			if unacked == 0 {
+				if time.Since(start) <= 20*time.Millisecond {
+					// under transparent proxy
+					time.Sleep(fallbackDelay)
+				}
+				return nil
+			}
+			time.Sleep(10 * time.Millisecond)
+		}
+	})
+}

common/tlsfragment/wait_linux.go

@@ -0,0 +1,40 @@
+package tf
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/sagernet/sing/common/control"
+
+	"golang.org/x/sys/unix"
+)
+
+func writeAndWaitAck(ctx context.Context, conn *net.TCPConn, payload []byte, fallbackDelay time.Duration) error {
+	_, err := conn.Write(payload)
+	if err != nil {
+		return err
+	}
+	return control.Conn(conn, func(fd uintptr) error {
+		start := time.Now()
+		for {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+			tcpInfo, err := unix.GetsockoptTCPInfo(int(fd), unix.IPPROTO_TCP, unix.TCP_INFO)
+			if err != nil {
+				return err
+			}
+			if tcpInfo.Unacked == 0 {
+				if time.Since(start) <= 20*time.Millisecond {
+					// under transparent proxy
+					time.Sleep(fallbackDelay)
+				}
+				return nil
+			}
+			time.Sleep(10 * time.Millisecond)
+		}
+	})
+}

common/tlsfragment/wait_stub.go

@@ -0,0 +1,14 @@
+//go:build !(linux || darwin || windows)
+
+package tf
+
+import (
+	"context"
+	"net"
+	"time"
+)
+
+func writeAndWaitAck(ctx context.Context, conn *net.TCPConn, payload []byte, fallbackDelay time.Duration) error {
+	time.Sleep(fallbackDelay)
+	return nil
+}

common/tlsfragment/wait_windows.go

@@ -0,0 +1,28 @@
+package tf
+
+import (
+	"context"
+	"errors"
+	"net"
+	"time"
+
+	"github.com/sagernet/sing/common/winiphlpapi"
+
+	"golang.org/x/sys/windows"
+)
+
+func writeAndWaitAck(ctx context.Context, conn *net.TCPConn, payload []byte, fallbackDelay time.Duration) error {
+	start := time.Now()
+	err := winiphlpapi.WriteAndWaitAck(ctx, conn, payload)
+	if err != nil {
+		if errors.Is(err, windows.ERROR_ACCESS_DENIED) {
+			time.Sleep(fallbackDelay)
+			return nil
+		}
+		return err
+	}
+	if time.Since(start) <= 20*time.Millisecond {
+		time.Sleep(fallbackDelay)
+	}
+	return nil
+}

common/urltest/urltest.go

@@ -2,32 +2,32 @@ package urltest
 
 import (
 	"context"
+	"crypto/tls"
 	"net"
 	"net/http"
 	"net/url"
 	"sync"
 	"time"
 
+	"github.com/sagernet/sing-box/adapter"
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing/common"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/ntp"
 )
 
-type History struct {
-	Time  time.Time `json:"time"`
-	Delay uint16    `json:"delay"`
-}
+var _ adapter.URLTestHistoryStorage = (*HistoryStorage)(nil)
 
 type HistoryStorage struct {
 	access       sync.RWMutex
-	delayHistory map[string]*History
+	delayHistory map[string]*adapter.URLTestHistory
 	updateHook   chan<- struct{}
 }
 
 func NewHistoryStorage() *HistoryStorage {
 	return &HistoryStorage{
-		delayHistory: make(map[string]*History),
+		delayHistory: make(map[string]*adapter.URLTestHistory),
 	}
 }
 
@@ -35,7 +35,7 @@ func (s *HistoryStorage) SetHook(hook chan<- struct{}) {
 	s.updateHook = hook
 }
 
-func (s *HistoryStorage) LoadURLTestHistory(tag string) *History {
+func (s *HistoryStorage) LoadURLTestHistory(tag string) *adapter.URLTestHistory {
 	if s == nil {
 		return nil
 	}
@@ -51,7 +51,7 @@ func (s *HistoryStorage) DeleteURLTestHistory(tag string) {
 	s.notifyUpdated()
 }
 
-func (s *HistoryStorage) StoreURLTestHistory(tag string, history *History) {
+func (s *HistoryStorage) StoreURLTestHistory(tag string, history *adapter.URLTestHistory) {
 	s.access.Lock()
 	s.delayHistory[tag] = history
 	s.access.Unlock()
@@ -110,6 +110,10 @@ func URLTest(ctx context.Context, link string, detour N.Dialer) (t uint16, err e
 			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
 				return instance, nil
 			},
+			TLSClientConfig: &tls.Config{
+				Time:    ntp.TimeFuncFromContext(ctx),
+				RootCAs: adapter.RootPoolFromContext(ctx),
+			},
 		},
 		CheckRedirect: func(req *http.Request, via []*http.Request) error {
 			return http.ErrUseLastResponse

constant/certificate.go

@@ -0,0 +1,7 @@
+package constant
+
+const (
+	CertificateStoreSystem  = "system"
+	CertificateStoreMozilla = "mozilla"
+	CertificateStoreNone    = "none"
+)

constant/dns.go

@@ -1,5 +1,34 @@
 package constant
 
+const (
+	DefaultDNSTTL = 600
+)
+
+type DomainStrategy = uint8
+
+const (
+	DomainStrategyAsIS DomainStrategy = iota
+	DomainStrategyPreferIPv4
+	DomainStrategyPreferIPv6
+	DomainStrategyIPv4Only
+	DomainStrategyIPv6Only
+)
+
+const (
+	DNSTypeLegacy     = "legacy"
+	DNSTypeUDP        = "udp"
+	DNSTypeTCP        = "tcp"
+	DNSTypeTLS        = "tls"
+	DNSTypeHTTPS      = "https"
+	DNSTypeQUIC       = "quic"
+	DNSTypeHTTP3      = "h3"
+	DNSTypeHosts      = "hosts"
+	DNSTypeLocal      = "local"
+	DNSTypePreDefined = "predefined"
+	DNSTypeFakeIP     = "fakeip"
+	DNSTypeDHCP       = "dhcp"
+)
+
 const (
 	DNSProviderAliDNS     = "alidns"
 	DNSProviderCloudflare = "cloudflare"

constant/proxy.go

@@ -23,7 +23,6 @@ const (
 	TypeVLESS        = "vless"
 	TypeTUIC         = "tuic"
 	TypeHysteria2    = "hysteria2"
-	TypeNDIS         = "ndis"
 )
 
 const (
@@ -81,8 +80,6 @@ func ProxyDisplayName(proxyType string) string {
 		return "Selector"
 	case TypeURLTest:
 		return "URLTest"
-	case TypeNDIS:
-		return "NDIS"
 	default:
 		return "Unknown"
 	}

constant/timeout.go

@@ -16,6 +16,7 @@ const (
 	StopTimeout                = 5 * time.Second
 	FatalStopTimeout           = 10 * time.Second
 	FakeIPMetadataSaveInterval = 10 * time.Second
+	TLSFragmentFallbackDelay   = 500 * time.Millisecond
 )
 
 var PortProtocols = map[uint16]string{

debug.go

@@ -3,6 +3,7 @@ package box
 import (
 	"runtime/debug"
 
+	"github.com/sagernet/sing-box/common/conntrack"
 	"github.com/sagernet/sing-box/option"
 )
 
@@ -25,5 +26,9 @@ func applyDebugOptions(options option.DebugOptions) {
 	}
 	if options.MemoryLimit != 0 {
 		debug.SetMemoryLimit(int64(float64(options.MemoryLimit) / 1.5))
+		conntrack.MemoryLimit = uint64(options.MemoryLimit)
+	}
+	if options.OOMKiller != nil {
+		conntrack.KillerEnabled = *options.OOMKiller
 	}
 }

dns/client.go

@@ -0,0 +1,563 @@
+package dns
+
+import (
+	"context"
+	"net"
+	"net/netip"
+	"strings"
+	"time"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	"github.com/sagernet/sing/common/task"
+	"github.com/sagernet/sing/contrab/freelru"
+	"github.com/sagernet/sing/contrab/maphash"
+
+	"github.com/miekg/dns"
+)
+
+var (
+	ErrNoRawSupport           = E.New("no raw query support by current transport")
+	ErrNotCached              = E.New("not cached")
+	ErrResponseRejected       = E.New("response rejected")
+	ErrResponseRejectedCached = E.Extend(ErrResponseRejected, "cached")
+)
+
+var _ adapter.DNSClient = (*Client)(nil)
+
+type Client struct {
+	timeout          time.Duration
+	disableCache     bool
+	disableExpire    bool
+	independentCache bool
+	rdrc             adapter.RDRCStore
+	initRDRCFunc     func() adapter.RDRCStore
+	logger           logger.ContextLogger
+	cache            freelru.Cache[dns.Question, *dns.Msg]
+	transportCache   freelru.Cache[transportCacheKey, *dns.Msg]
+}
+
+type ClientOptions struct {
+	Timeout          time.Duration
+	DisableCache     bool
+	DisableExpire    bool
+	IndependentCache bool
+	CacheCapacity    uint32
+	RDRC             func() adapter.RDRCStore
+	Logger           logger.ContextLogger
+}
+
+func NewClient(options ClientOptions) *Client {
+	client := &Client{
+		timeout:          options.Timeout,
+		disableCache:     options.DisableCache,
+		disableExpire:    options.DisableExpire,
+		independentCache: options.IndependentCache,
+		initRDRCFunc:     options.RDRC,
+		logger:           options.Logger,
+	}
+	if client.timeout == 0 {
+		client.timeout = C.DNSTimeout
+	}
+	cacheCapacity := options.CacheCapacity
+	if cacheCapacity < 1024 {
+		cacheCapacity = 1024
+	}
+	if !client.disableCache {
+		if !client.independentCache {
+			client.cache = common.Must1(freelru.NewSharded[dns.Question, *dns.Msg](cacheCapacity, maphash.NewHasher[dns.Question]().Hash32))
+		} else {
+			client.transportCache = common.Must1(freelru.NewSharded[transportCacheKey, *dns.Msg](cacheCapacity, maphash.NewHasher[transportCacheKey]().Hash32))
+		}
+	}
+	return client
+}
+
+type transportCacheKey struct {
+	dns.Question
+	transportTag string
+}
+
+func (c *Client) Start() {
+	if c.initRDRCFunc != nil {
+		c.rdrc = c.initRDRCFunc()
+	}
+}
+
+func (c *Client) Exchange(ctx context.Context, transport adapter.DNSTransport, message *dns.Msg, options adapter.DNSQueryOptions, responseChecker func(responseAddrs []netip.Addr) bool) (*dns.Msg, error) {
+	if len(message.Question) == 0 {
+		if c.logger != nil {
+			c.logger.WarnContext(ctx, "bad question size: ", len(message.Question))
+		}
+		responseMessage := dns.Msg{
+			MsgHdr: dns.MsgHdr{
+				Id:       message.Id,
+				Response: true,
+				Rcode:    dns.RcodeFormatError,
+			},
+			Question: message.Question,
+		}
+		return &responseMessage, nil
+	}
+	question := message.Question[0]
+	if options.ClientSubnet.IsValid() {
+		message = SetClientSubnet(message, options.ClientSubnet, true)
+	}
+	isSimpleRequest := len(message.Question) == 1 &&
+		len(message.Ns) == 0 &&
+		len(message.Extra) == 0 &&
+		!options.ClientSubnet.IsValid()
+	disableCache := !isSimpleRequest || c.disableCache || options.DisableCache
+	if !disableCache {
+		response, ttl := c.loadResponse(question, transport)
+		if response != nil {
+			logCachedResponse(c.logger, ctx, response, ttl)
+			response.Id = message.Id
+			return response, nil
+		}
+	}
+	if question.Qtype == dns.TypeA && options.Strategy == C.DomainStrategyIPv6Only || question.Qtype == dns.TypeAAAA && options.Strategy == C.DomainStrategyIPv4Only {
+		responseMessage := dns.Msg{
+			MsgHdr: dns.MsgHdr{
+				Id:       message.Id,
+				Response: true,
+				Rcode:    dns.RcodeSuccess,
+			},
+			Question: []dns.Question{question},
+		}
+		if c.logger != nil {
+			c.logger.DebugContext(ctx, "strategy rejected")
+		}
+		return &responseMessage, nil
+	}
+	messageId := message.Id
+	contextTransport, clientSubnetLoaded := transportTagFromContext(ctx)
+	if clientSubnetLoaded && transport.Tag() == contextTransport {
+		return nil, E.New("DNS query loopback in transport[", contextTransport, "]")
+	}
+	ctx = contextWithTransportTag(ctx, transport.Tag())
+	if responseChecker != nil && c.rdrc != nil {
+		rejected := c.rdrc.LoadRDRC(transport.Tag(), question.Name, question.Qtype)
+		if rejected {
+			return nil, ErrResponseRejectedCached
+		}
+	}
+	ctx, cancel := context.WithTimeout(ctx, c.timeout)
+	response, err := transport.Exchange(ctx, message)
+	cancel()
+	if err != nil {
+		return nil, err
+	}
+	/*if question.Qtype == dns.TypeA || question.Qtype == dns.TypeAAAA {
+		validResponse := response
+	loop:
+		for {
+			var (
+				addresses  int
+				queryCNAME string
+			)
+			for _, rawRR := range validResponse.Answer {
+				switch rr := rawRR.(type) {
+				case *dns.A:
+					break loop
+				case *dns.AAAA:
+					break loop
+				case *dns.CNAME:
+					queryCNAME = rr.Target
+				}
+			}
+			if queryCNAME == "" {
+				break
+			}
+			exMessage := *message
+			exMessage.Question = []dns.Question{{
+				Name:  queryCNAME,
+				Qtype: question.Qtype,
+			}}
+			validResponse, err = c.Exchange(ctx, transport, &exMessage, options, responseChecker)
+			if err != nil {
+				return nil, err
+			}
+		}
+		if validResponse != response {
+			response.Answer = append(response.Answer, validResponse.Answer...)
+		}
+	}*/
+	if responseChecker != nil {
+		addr, addrErr := MessageToAddresses(response)
+		if addrErr != nil || !responseChecker(addr) {
+			if c.rdrc != nil {
+				c.rdrc.SaveRDRCAsync(transport.Tag(), question.Name, question.Qtype, c.logger)
+			}
+			logRejectedResponse(c.logger, ctx, response)
+			return response, ErrResponseRejected
+		}
+	}
+	if question.Qtype == dns.TypeHTTPS {
+		if options.Strategy == C.DomainStrategyIPv4Only || options.Strategy == C.DomainStrategyIPv6Only {
+			for _, rr := range response.Answer {
+				https, isHTTPS := rr.(*dns.HTTPS)
+				if !isHTTPS {
+					continue
+				}
+				content := https.SVCB
+				content.Value = common.Filter(content.Value, func(it dns.SVCBKeyValue) bool {
+					if options.Strategy == C.DomainStrategyIPv4Only {
+						return it.Key() != dns.SVCB_IPV6HINT
+					} else {
+						return it.Key() != dns.SVCB_IPV4HINT
+					}
+				})
+				https.SVCB = content
+			}
+		}
+	}
+	var timeToLive uint32
+	for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+		for _, record := range recordList {
+			if timeToLive == 0 || record.Header().Ttl > 0 && record.Header().Ttl < timeToLive {
+				timeToLive = record.Header().Ttl
+			}
+		}
+	}
+	if options.RewriteTTL != nil {
+		timeToLive = *options.RewriteTTL
+	}
+	for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+		for _, record := range recordList {
+			record.Header().Ttl = timeToLive
+		}
+	}
+	response.Id = messageId
+	if !disableCache {
+		c.storeCache(transport, question, response, timeToLive)
+	}
+	logExchangedResponse(c.logger, ctx, response, timeToLive)
+	return response, err
+}
+
+func (c *Client) Lookup(ctx context.Context, transport adapter.DNSTransport, domain string, options adapter.DNSQueryOptions, responseChecker func(responseAddrs []netip.Addr) bool) ([]netip.Addr, error) {
+	domain = FqdnToDomain(domain)
+	dnsName := dns.Fqdn(domain)
+	if options.Strategy == C.DomainStrategyIPv4Only {
+		return c.lookupToExchange(ctx, transport, dnsName, dns.TypeA, options, responseChecker)
+	} else if options.Strategy == C.DomainStrategyIPv6Only {
+		return c.lookupToExchange(ctx, transport, dnsName, dns.TypeAAAA, options, responseChecker)
+	}
+	var response4 []netip.Addr
+	var response6 []netip.Addr
+	var group task.Group
+	group.Append("exchange4", func(ctx context.Context) error {
+		response, err := c.lookupToExchange(ctx, transport, dnsName, dns.TypeA, options, responseChecker)
+		if err != nil {
+			return err
+		}
+		response4 = response
+		return nil
+	})
+	group.Append("exchange6", func(ctx context.Context) error {
+		response, err := c.lookupToExchange(ctx, transport, dnsName, dns.TypeAAAA, options, responseChecker)
+		if err != nil {
+			return err
+		}
+		response6 = response
+		return nil
+	})
+	err := group.Run(ctx)
+	if len(response4) == 0 && len(response6) == 0 {
+		return nil, err
+	}
+	return sortAddresses(response4, response6, options.Strategy), nil
+}
+
+func (c *Client) ClearCache() {
+	if c.cache != nil {
+		c.cache.Purge()
+	}
+	if c.transportCache != nil {
+		c.transportCache.Purge()
+	}
+}
+
+func (c *Client) LookupCache(domain string, strategy C.DomainStrategy) ([]netip.Addr, bool) {
+	if c.disableCache || c.independentCache {
+		return nil, false
+	}
+	if dns.IsFqdn(domain) {
+		domain = domain[:len(domain)-1]
+	}
+	dnsName := dns.Fqdn(domain)
+	if strategy == C.DomainStrategyIPv4Only {
+		response, err := c.questionCache(dns.Question{
+			Name:   dnsName,
+			Qtype:  dns.TypeA,
+			Qclass: dns.ClassINET,
+		}, nil)
+		if err != ErrNotCached {
+			return response, true
+		}
+	} else if strategy == C.DomainStrategyIPv6Only {
+		response, err := c.questionCache(dns.Question{
+			Name:   dnsName,
+			Qtype:  dns.TypeAAAA,
+			Qclass: dns.ClassINET,
+		}, nil)
+		if err != ErrNotCached {
+			return response, true
+		}
+	} else {
+		response4, _ := c.questionCache(dns.Question{
+			Name:   dnsName,
+			Qtype:  dns.TypeA,
+			Qclass: dns.ClassINET,
+		}, nil)
+		response6, _ := c.questionCache(dns.Question{
+			Name:   dnsName,
+			Qtype:  dns.TypeAAAA,
+			Qclass: dns.ClassINET,
+		}, nil)
+		if len(response4) > 0 || len(response6) > 0 {
+			return sortAddresses(response4, response6, strategy), true
+		}
+	}
+	return nil, false
+}
+
+func (c *Client) ExchangeCache(ctx context.Context, message *dns.Msg) (*dns.Msg, bool) {
+	if c.disableCache || c.independentCache || len(message.Question) != 1 {
+		return nil, false
+	}
+	question := message.Question[0]
+	response, ttl := c.loadResponse(question, nil)
+	if response == nil {
+		return nil, false
+	}
+	logCachedResponse(c.logger, ctx, response, ttl)
+	response.Id = message.Id
+	return response, true
+}
+
+func sortAddresses(response4 []netip.Addr, response6 []netip.Addr, strategy C.DomainStrategy) []netip.Addr {
+	if strategy == C.DomainStrategyPreferIPv6 {
+		return append(response6, response4...)
+	} else {
+		return append(response4, response6...)
+	}
+}
+
+func (c *Client) storeCache(transport adapter.DNSTransport, question dns.Question, message *dns.Msg, timeToLive uint32) {
+	if timeToLive == 0 {
+		return
+	}
+	if c.disableExpire {
+		if !c.independentCache {
+			c.cache.Add(question, message)
+		} else {
+			c.transportCache.Add(transportCacheKey{
+				Question:     question,
+				transportTag: transport.Tag(),
+			}, message)
+		}
+		return
+	}
+	if !c.independentCache {
+		c.cache.AddWithLifetime(question, message, time.Second*time.Duration(timeToLive))
+	} else {
+		c.transportCache.AddWithLifetime(transportCacheKey{
+			Question:     question,
+			transportTag: transport.Tag(),
+		}, message, time.Second*time.Duration(timeToLive))
+	}
+}
+
+func (c *Client) lookupToExchange(ctx context.Context, transport adapter.DNSTransport, name string, qType uint16, options adapter.DNSQueryOptions, responseChecker func(responseAddrs []netip.Addr) bool) ([]netip.Addr, error) {
+	question := dns.Question{
+		Name:   name,
+		Qtype:  qType,
+		Qclass: dns.ClassINET,
+	}
+	disableCache := c.disableCache || options.DisableCache
+	if !disableCache {
+		cachedAddresses, err := c.questionCache(question, transport)
+		if err != ErrNotCached {
+			return cachedAddresses, err
+		}
+	}
+	message := dns.Msg{
+		MsgHdr: dns.MsgHdr{
+			RecursionDesired: true,
+		},
+		Question: []dns.Question{question},
+	}
+	response, err := c.Exchange(ctx, transport, &message, options, responseChecker)
+	if err != nil {
+		return nil, err
+	}
+	return MessageToAddresses(response)
+}
+
+func (c *Client) questionCache(question dns.Question, transport adapter.DNSTransport) ([]netip.Addr, error) {
+	response, _ := c.loadResponse(question, transport)
+	if response == nil {
+		return nil, ErrNotCached
+	}
+	return MessageToAddresses(response)
+}
+
+func (c *Client) loadResponse(question dns.Question, transport adapter.DNSTransport) (*dns.Msg, int) {
+	var (
+		response *dns.Msg
+		loaded   bool
+	)
+	if c.disableExpire {
+		if !c.independentCache {
+			response, loaded = c.cache.Get(question)
+		} else {
+			response, loaded = c.transportCache.Get(transportCacheKey{
+				Question:     question,
+				transportTag: transport.Tag(),
+			})
+		}
+		if !loaded {
+			return nil, 0
+		}
+		return response.Copy(), 0
+	} else {
+		var expireAt time.Time
+		if !c.independentCache {
+			response, expireAt, loaded = c.cache.GetWithLifetime(question)
+		} else {
+			response, expireAt, loaded = c.transportCache.GetWithLifetime(transportCacheKey{
+				Question:     question,
+				transportTag: transport.Tag(),
+			})
+		}
+		if !loaded {
+			return nil, 0
+		}
+		timeNow := time.Now()
+		if timeNow.After(expireAt) {
+			if !c.independentCache {
+				c.cache.Remove(question)
+			} else {
+				c.transportCache.Remove(transportCacheKey{
+					Question:     question,
+					transportTag: transport.Tag(),
+				})
+			}
+			return nil, 0
+		}
+		var originTTL int
+		for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+			for _, record := range recordList {
+				if originTTL == 0 || record.Header().Ttl > 0 && int(record.Header().Ttl) < originTTL {
+					originTTL = int(record.Header().Ttl)
+				}
+			}
+		}
+		nowTTL := int(expireAt.Sub(timeNow).Seconds())
+		if nowTTL < 0 {
+			nowTTL = 0
+		}
+		response = response.Copy()
+		if originTTL > 0 {
+			duration := uint32(originTTL - nowTTL)
+			for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+				for _, record := range recordList {
+					record.Header().Ttl = record.Header().Ttl - duration
+				}
+			}
+		} else {
+			for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+				for _, record := range recordList {
+					record.Header().Ttl = uint32(nowTTL)
+				}
+			}
+		}
+		return response, nowTTL
+	}
+}
+
+func MessageToAddresses(response *dns.Msg) ([]netip.Addr, error) {
+	if response.Rcode != dns.RcodeSuccess && response.Rcode != dns.RcodeNameError {
+		return nil, RCodeError(response.Rcode)
+	}
+	addresses := make([]netip.Addr, 0, len(response.Answer))
+	for _, rawAnswer := range response.Answer {
+		switch answer := rawAnswer.(type) {
+		case *dns.A:
+			addresses = append(addresses, M.AddrFromIP(answer.A))
+		case *dns.AAAA:
+			addresses = append(addresses, M.AddrFromIP(answer.AAAA))
+		case *dns.HTTPS:
+			for _, value := range answer.SVCB.Value {
+				if value.Key() == dns.SVCB_IPV4HINT || value.Key() == dns.SVCB_IPV6HINT {
+					addresses = append(addresses, common.Map(strings.Split(value.String(), ","), M.ParseAddr)...)
+				}
+			}
+		}
+	}
+	return addresses, nil
+}
+
+func wrapError(err error) error {
+	switch dnsErr := err.(type) {
+	case *net.DNSError:
+		if dnsErr.IsNotFound {
+			return RCodeNameError
+		}
+	case *net.AddrError:
+		return RCodeNameError
+	}
+	return err
+}
+
+type transportKey struct{}
+
+func contextWithTransportTag(ctx context.Context, transportTag string) context.Context {
+	return context.WithValue(ctx, transportKey{}, transportTag)
+}
+
+func transportTagFromContext(ctx context.Context) (string, bool) {
+	value, loaded := ctx.Value(transportKey{}).(string)
+	return value, loaded
+}
+
+func FixedResponse(id uint16, question dns.Question, addresses []netip.Addr, timeToLive uint32) *dns.Msg {
+	response := dns.Msg{
+		MsgHdr: dns.MsgHdr{
+			Id:       id,
+			Rcode:    dns.RcodeSuccess,
+			Response: true,
+		},
+		Question: []dns.Question{question},
+	}
+	for _, address := range addresses {
+		if address.Is4() {
+			response.Answer = append(response.Answer, &dns.A{
+				Hdr: dns.RR_Header{
+					Name:   question.Name,
+					Rrtype: dns.TypeA,
+					Class:  dns.ClassINET,
+					Ttl:    timeToLive,
+				},
+				A: address.AsSlice(),
+			})
+		} else {
+			response.Answer = append(response.Answer, &dns.AAAA{
+				Hdr: dns.RR_Header{
+					Name:   question.Name,
+					Rrtype: dns.TypeAAAA,
+					Class:  dns.ClassINET,
+					Ttl:    timeToLive,
+				},
+				AAAA: address.AsSlice(),
+			})
+		}
+	}
+	return &response
+}

dns/client_log.go

@@ -0,0 +1,69 @@
+package dns
+
+import (
+	"context"
+	"strings"
+
+	"github.com/sagernet/sing/common/logger"
+
+	"github.com/miekg/dns"
+)
+
+func logCachedResponse(logger logger.ContextLogger, ctx context.Context, response *dns.Msg, ttl int) {
+	if logger == nil || len(response.Question) == 0 {
+		return
+	}
+	domain := FqdnToDomain(response.Question[0].Name)
+	logger.DebugContext(ctx, "cached ", domain, " ", dns.RcodeToString[response.Rcode], " ", ttl)
+	for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+		for _, record := range recordList {
+			logger.InfoContext(ctx, "cached ", dns.Type(record.Header().Rrtype).String(), " ", FormatQuestion(record.String()))
+		}
+	}
+}
+
+func logExchangedResponse(logger logger.ContextLogger, ctx context.Context, response *dns.Msg, ttl uint32) {
+	if logger == nil || len(response.Question) == 0 {
+		return
+	}
+	domain := FqdnToDomain(response.Question[0].Name)
+	logger.DebugContext(ctx, "exchanged ", domain, " ", dns.RcodeToString[response.Rcode], " ", ttl)
+	for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+		for _, record := range recordList {
+			logger.InfoContext(ctx, "exchanged ", dns.Type(record.Header().Rrtype).String(), " ", FormatQuestion(record.String()))
+		}
+	}
+}
+
+func logRejectedResponse(logger logger.ContextLogger, ctx context.Context, response *dns.Msg) {
+	if logger == nil || len(response.Question) == 0 {
+		return
+	}
+	for _, recordList := range [][]dns.RR{response.Answer, response.Ns, response.Extra} {
+		for _, record := range recordList {
+			logger.InfoContext(ctx, "rejected ", dns.Type(record.Header().Rrtype).String(), " ", FormatQuestion(record.String()))
+		}
+	}
+}
+
+func FqdnToDomain(fqdn string) string {
+	if dns.IsFqdn(fqdn) {
+		return fqdn[:len(fqdn)-1]
+	}
+	return fqdn
+}
+
+func FormatQuestion(string string) string {
+	for strings.HasPrefix(string, ";") {
+		string = string[1:]
+	}
+	string = strings.ReplaceAll(string, "\t", " ")
+	string = strings.ReplaceAll(string, "\n", " ")
+	string = strings.ReplaceAll(string, ";; ", " ")
+	string = strings.ReplaceAll(string, "; ", " ")
+
+	for strings.Contains(string, "  ") {
+		string = strings.ReplaceAll(string, "  ", " ")
+	}
+	return strings.TrimSpace(string)
+}

dns/client_truncate.go

@@ -0,0 +1,29 @@
+package dns
+
+import (
+	"github.com/sagernet/sing/common/buf"
+
+	"github.com/miekg/dns"
+)
+
+func TruncateDNSMessage(request *dns.Msg, response *dns.Msg, headroom int) (*buf.Buffer, error) {
+	maxLen := 512
+	if edns0Option := request.IsEdns0(); edns0Option != nil {
+		if udpSize := int(edns0Option.UDPSize()); udpSize > 512 {
+			maxLen = udpSize
+		}
+	}
+	responseLen := response.Len()
+	if responseLen > maxLen {
+		response.Truncate(maxLen)
+	}
+	buffer := buf.NewSize(headroom*2 + 1 + responseLen)
+	buffer.Resize(headroom, 0)
+	rawMessage, err := response.PackBuffer(buffer.FreeBytes())
+	if err != nil {
+		buffer.Release()
+		return nil, err
+	}
+	buffer.Truncate(len(rawMessage))
+	return buffer, nil
+}

dns/extension_edns0_subnet.go

@@ -0,0 +1,56 @@
+package dns
+
+import (
+	"net/netip"
+
+	"github.com/miekg/dns"
+)
+
+func SetClientSubnet(message *dns.Msg, clientSubnet netip.Prefix, override bool) *dns.Msg {
+	var (
+		optRecord    *dns.OPT
+		subnetOption *dns.EDNS0_SUBNET
+	)
+findExists:
+	for _, record := range message.Extra {
+		var isOPTRecord bool
+		if optRecord, isOPTRecord = record.(*dns.OPT); isOPTRecord {
+			for _, option := range optRecord.Option {
+				var isEDNS0Subnet bool
+				subnetOption, isEDNS0Subnet = option.(*dns.EDNS0_SUBNET)
+				if isEDNS0Subnet {
+					if !override {
+						return message
+					}
+					break findExists
+				}
+			}
+		}
+	}
+	if optRecord == nil {
+		exMessage := *message
+		message = &exMessage
+		optRecord = &dns.OPT{
+			Hdr: dns.RR_Header{
+				Name:   ".",
+				Rrtype: dns.TypeOPT,
+			},
+		}
+		message.Extra = append(message.Extra, optRecord)
+	} else {
+		message = message.Copy()
+	}
+	if subnetOption == nil {
+		subnetOption = new(dns.EDNS0_SUBNET)
+		optRecord.Option = append(optRecord.Option, subnetOption)
+	}
+	subnetOption.Code = dns.EDNS0SUBNET
+	if clientSubnet.Addr().Is4() {
+		subnetOption.Family = 1
+	} else {
+		subnetOption.Family = 2
+	}
+	subnetOption.SourceNetmask = uint8(clientSubnet.Bits())
+	subnetOption.Address = clientSubnet.Addr().AsSlice()
+	return message
+}

dns/rcode.go

@@ -0,0 +1,33 @@
+package dns
+
+import F "github.com/sagernet/sing/common/format"
+
+const (
+	RCodeSuccess        RCodeError = 0 // NoError
+	RCodeFormatError    RCodeError = 1 // FormErr
+	RCodeServerFailure  RCodeError = 2 // ServFail
+	RCodeNameError      RCodeError = 3 // NXDomain
+	RCodeNotImplemented RCodeError = 4 // NotImp
+	RCodeRefused        RCodeError = 5 // Refused
+)
+
+type RCodeError uint16
+
+func (e RCodeError) Error() string {
+	switch e {
+	case RCodeSuccess:
+		return "success"
+	case RCodeFormatError:
+		return "format error"
+	case RCodeServerFailure:
+		return "server failure"
+	case RCodeNameError:
+		return "name error"
+	case RCodeNotImplemented:
+		return "not implemented"
+	case RCodeRefused:
+		return "refused"
+	default:
+		return F.ToString("unknown error: ", uint16(e))
+	}
+}

dns/router.go

@@ -0,0 +1,437 @@
+package dns
+
+import (
+	"context"
+	"errors"
+	"net/netip"
+	"strings"
+	"time"
+
+	"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/experimental/libbox/platform"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	R "github.com/sagernet/sing-box/route/rule"
+	"github.com/sagernet/sing-tun"
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+	F "github.com/sagernet/sing/common/format"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	"github.com/sagernet/sing/contrab/freelru"
+	"github.com/sagernet/sing/contrab/maphash"
+	"github.com/sagernet/sing/service"
+
+	mDNS "github.com/miekg/dns"
+)
+
+var _ adapter.DNSRouter = (*Router)(nil)
+
+type Router struct {
+	ctx                   context.Context
+	logger                logger.ContextLogger
+	transport             adapter.DNSTransportManager
+	outbound              adapter.OutboundManager
+	client                adapter.DNSClient
+	rules                 []adapter.DNSRule
+	defaultDomainStrategy C.DomainStrategy
+	dnsReverseMapping     freelru.Cache[netip.Addr, string]
+	platformInterface     platform.Interface
+}
+
+func NewRouter(ctx context.Context, logFactory log.Factory, options option.DNSOptions) *Router {
+	router := &Router{
+		ctx:                   ctx,
+		logger:                logFactory.NewLogger("dns"),
+		transport:             service.FromContext[adapter.DNSTransportManager](ctx),
+		outbound:              service.FromContext[adapter.OutboundManager](ctx),
+		rules:                 make([]adapter.DNSRule, 0, len(options.Rules)),
+		defaultDomainStrategy: C.DomainStrategy(options.Strategy),
+	}
+	router.client = NewClient(ClientOptions{
+		DisableCache:     options.DNSClientOptions.DisableCache,
+		DisableExpire:    options.DNSClientOptions.DisableExpire,
+		IndependentCache: options.DNSClientOptions.IndependentCache,
+		CacheCapacity:    options.DNSClientOptions.CacheCapacity,
+		RDRC: func() adapter.RDRCStore {
+			cacheFile := service.FromContext[adapter.CacheFile](ctx)
+			if cacheFile == nil {
+				return nil
+			}
+			if !cacheFile.StoreRDRC() {
+				return nil
+			}
+			return cacheFile
+		},
+		Logger: router.logger,
+	})
+	if options.ReverseMapping {
+		router.dnsReverseMapping = common.Must1(freelru.NewSharded[netip.Addr, string](1024, maphash.NewHasher[netip.Addr]().Hash32))
+	}
+	return router
+}
+
+func (r *Router) Initialize(rules []option.DNSRule) error {
+	for i, ruleOptions := range rules {
+		dnsRule, err := R.NewDNSRule(r.ctx, r.logger, ruleOptions, true)
+		if err != nil {
+			return E.Cause(err, "parse dns rule[", i, "]")
+		}
+		r.rules = append(r.rules, dnsRule)
+	}
+	return nil
+}
+
+func (r *Router) Start(stage adapter.StartStage) error {
+	monitor := taskmonitor.New(r.logger, C.StartTimeout)
+	switch stage {
+	case adapter.StartStateStart:
+		monitor.Start("initialize DNS client")
+		r.client.Start()
+		monitor.Finish()
+
+		for i, rule := range r.rules {
+			monitor.Start("initialize DNS rule[", i, "]")
+			err := rule.Start()
+			monitor.Finish()
+			if err != nil {
+				return E.Cause(err, "initialize DNS rule[", i, "]")
+			}
+		}
+	}
+	return nil
+}
+
+func (r *Router) Close() error {
+	monitor := taskmonitor.New(r.logger, C.StopTimeout)
+	var err error
+	for i, rule := range r.rules {
+		monitor.Start("close dns rule[", i, "]")
+		err = E.Append(err, rule.Close(), func(err error) error {
+			return E.Cause(err, "close dns rule[", i, "]")
+		})
+		monitor.Finish()
+	}
+	return err
+}
+
+func (r *Router) matchDNS(ctx context.Context, allowFakeIP bool, ruleIndex int, isAddressQuery bool, options *adapter.DNSQueryOptions) (adapter.DNSTransport, adapter.DNSRule, int) {
+	metadata := adapter.ContextFrom(ctx)
+	if metadata == nil {
+		panic("no context")
+	}
+	var currentRuleIndex int
+	if ruleIndex != -1 {
+		currentRuleIndex = ruleIndex + 1
+	}
+	for ; currentRuleIndex < len(r.rules); currentRuleIndex++ {
+		currentRule := r.rules[currentRuleIndex]
+		if currentRule.WithAddressLimit() && !isAddressQuery {
+			continue
+		}
+		metadata.ResetRuleCache()
+		if currentRule.Match(metadata) {
+			displayRuleIndex := currentRuleIndex
+			if displayRuleIndex != -1 {
+				displayRuleIndex += displayRuleIndex + 1
+			}
+			ruleDescription := currentRule.String()
+			if ruleDescription != "" {
+				r.logger.DebugContext(ctx, "match[", displayRuleIndex, "] ", currentRule, " => ", currentRule.Action())
+			} else {
+				r.logger.DebugContext(ctx, "match[", displayRuleIndex, "] => ", currentRule.Action())
+			}
+			switch action := currentRule.Action().(type) {
+			case *R.RuleActionDNSRoute:
+				transport, loaded := r.transport.Transport(action.Server)
+				if !loaded {
+					r.logger.ErrorContext(ctx, "transport not found: ", action.Server)
+					continue
+				}
+				isFakeIP := transport.Type() == C.DNSTypeFakeIP
+				if isFakeIP && !allowFakeIP {
+					continue
+				}
+				if action.Strategy != C.DomainStrategyAsIS {
+					options.Strategy = action.Strategy
+				}
+				if isFakeIP || action.DisableCache {
+					options.DisableCache = true
+				}
+				if action.RewriteTTL != nil {
+					options.RewriteTTL = action.RewriteTTL
+				}
+				if action.ClientSubnet.IsValid() {
+					options.ClientSubnet = action.ClientSubnet
+				}
+				if legacyTransport, isLegacy := transport.(adapter.LegacyDNSTransport); isLegacy {
+					if options.Strategy == C.DomainStrategyAsIS {
+						options.Strategy = legacyTransport.LegacyStrategy()
+					}
+					if !options.ClientSubnet.IsValid() {
+						options.ClientSubnet = legacyTransport.LegacyClientSubnet()
+					}
+				}
+				r.logger.DebugContext(ctx, "match[", displayRuleIndex, "] => ", currentRule.Action())
+				return transport, currentRule, currentRuleIndex
+			case *R.RuleActionDNSRouteOptions:
+				if action.Strategy != C.DomainStrategyAsIS {
+					options.Strategy = action.Strategy
+				}
+				if action.DisableCache {
+					options.DisableCache = true
+				}
+				if action.RewriteTTL != nil {
+					options.RewriteTTL = action.RewriteTTL
+				}
+				if action.ClientSubnet.IsValid() {
+					options.ClientSubnet = action.ClientSubnet
+				}
+				r.logger.DebugContext(ctx, "match[", displayRuleIndex, "] => ", currentRule.Action())
+			case *R.RuleActionReject:
+				r.logger.DebugContext(ctx, "match[", displayRuleIndex, "] => ", currentRule.Action())
+				return nil, currentRule, currentRuleIndex
+			}
+		}
+	}
+	return r.transport.Default(), nil, -1
+}
+
+func (r *Router) Exchange(ctx context.Context, message *mDNS.Msg, options adapter.DNSQueryOptions) (*mDNS.Msg, error) {
+	if len(message.Question) != 1 {
+		r.logger.WarnContext(ctx, "bad question size: ", len(message.Question))
+		responseMessage := mDNS.Msg{
+			MsgHdr: mDNS.MsgHdr{
+				Id:       message.Id,
+				Response: true,
+				Rcode:    mDNS.RcodeFormatError,
+			},
+			Question: message.Question,
+		}
+		return &responseMessage, nil
+	}
+	r.logger.DebugContext(ctx, "exchange ", FormatQuestion(message.Question[0].String()))
+	var (
+		transport adapter.DNSTransport
+		err       error
+	)
+	response, cached := r.client.ExchangeCache(ctx, message)
+	if !cached {
+		var metadata *adapter.InboundContext
+		ctx, metadata = adapter.ExtendContext(ctx)
+		metadata.Destination = M.Socksaddr{}
+		metadata.QueryType = message.Question[0].Qtype
+		switch metadata.QueryType {
+		case mDNS.TypeA:
+			metadata.IPVersion = 4
+		case mDNS.TypeAAAA:
+			metadata.IPVersion = 6
+		}
+		metadata.Domain = FqdnToDomain(message.Question[0].Name)
+		if options.Transport != nil {
+			transport = options.Transport
+			if legacyTransport, isLegacy := transport.(adapter.LegacyDNSTransport); isLegacy {
+				if options.Strategy == C.DomainStrategyAsIS {
+					options.Strategy = legacyTransport.LegacyStrategy()
+				}
+				if !options.ClientSubnet.IsValid() {
+					options.ClientSubnet = legacyTransport.LegacyClientSubnet()
+				}
+			}
+			if options.Strategy == C.DomainStrategyAsIS {
+				options.Strategy = r.defaultDomainStrategy
+			}
+			response, err = r.client.Exchange(ctx, transport, message, options, nil)
+		} else {
+			var (
+				rule      adapter.DNSRule
+				ruleIndex int
+			)
+			ruleIndex = -1
+			for {
+				dnsCtx := adapter.OverrideContext(ctx)
+				dnsOptions := options
+				transport, rule, ruleIndex = r.matchDNS(ctx, true, ruleIndex, isAddressQuery(message), &dnsOptions)
+				if rule != nil {
+					switch action := rule.Action().(type) {
+					case *R.RuleActionReject:
+						switch action.Method {
+						case C.RuleActionRejectMethodDefault:
+							return FixedResponse(message.Id, message.Question[0], nil, 0), nil
+						case C.RuleActionRejectMethodDrop:
+							return nil, tun.ErrDrop
+						}
+					}
+				}
+				var responseCheck func(responseAddrs []netip.Addr) bool
+				if rule != nil && rule.WithAddressLimit() {
+					responseCheck = func(responseAddrs []netip.Addr) bool {
+						metadata.DestinationAddresses = responseAddrs
+						return rule.MatchAddressLimit(metadata)
+					}
+				}
+				if dnsOptions.Strategy == C.DomainStrategyAsIS {
+					dnsOptions.Strategy = r.defaultDomainStrategy
+				}
+				response, err = r.client.Exchange(dnsCtx, transport, message, dnsOptions, responseCheck)
+				var rejected bool
+				if err != nil {
+					if errors.Is(err, ErrResponseRejectedCached) {
+						rejected = true
+						r.logger.DebugContext(ctx, E.Cause(err, "response rejected for ", FormatQuestion(message.Question[0].String())), " (cached)")
+					} else if errors.Is(err, ErrResponseRejected) {
+						rejected = true
+						r.logger.DebugContext(ctx, E.Cause(err, "response rejected for ", FormatQuestion(message.Question[0].String())))
+					} else if len(message.Question) > 0 {
+						r.logger.ErrorContext(ctx, E.Cause(err, "exchange failed for ", FormatQuestion(message.Question[0].String())))
+					} else {
+						r.logger.ErrorContext(ctx, E.Cause(err, "exchange failed for <empty query>"))
+					}
+				}
+				if responseCheck != nil && rejected {
+					continue
+				}
+				break
+			}
+		}
+	}
+	if err != nil {
+		return nil, err
+	}
+	if r.dnsReverseMapping != nil && len(message.Question) > 0 && response != nil && len(response.Answer) > 0 {
+		if transport == nil || transport.Type() != C.DNSTypeFakeIP {
+			for _, answer := range response.Answer {
+				switch record := answer.(type) {
+				case *mDNS.A:
+					r.dnsReverseMapping.AddWithLifetime(M.AddrFromIP(record.A), FqdnToDomain(record.Hdr.Name), time.Duration(record.Hdr.Ttl)*time.Second)
+				case *mDNS.AAAA:
+					r.dnsReverseMapping.AddWithLifetime(M.AddrFromIP(record.AAAA), FqdnToDomain(record.Hdr.Name), time.Duration(record.Hdr.Ttl)*time.Second)
+				}
+			}
+		}
+	}
+	return response, nil
+}
+
+func (r *Router) Lookup(ctx context.Context, domain string, options adapter.DNSQueryOptions) ([]netip.Addr, error) {
+	var (
+		responseAddrs []netip.Addr
+		cached        bool
+		err           error
+	)
+	printResult := func() {
+		if err != nil {
+			if errors.Is(err, ErrResponseRejectedCached) {
+				r.logger.DebugContext(ctx, "response rejected for ", domain, " (cached)")
+			} else if errors.Is(err, ErrResponseRejected) {
+				r.logger.DebugContext(ctx, "response rejected for ", domain)
+			} else {
+				r.logger.ErrorContext(ctx, E.Cause(err, "lookup failed for ", domain))
+			}
+		} else if len(responseAddrs) == 0 {
+			r.logger.ErrorContext(ctx, "lookup failed for ", domain, ": empty result")
+			err = RCodeNameError
+		}
+	}
+	responseAddrs, cached = r.client.LookupCache(domain, options.Strategy)
+	if cached {
+		if len(responseAddrs) == 0 {
+			return nil, RCodeNameError
+		}
+		return responseAddrs, nil
+	}
+	r.logger.DebugContext(ctx, "lookup domain ", domain)
+	ctx, metadata := adapter.ExtendContext(ctx)
+	metadata.Destination = M.Socksaddr{}
+	metadata.Domain = domain
+	if options.Transport != nil {
+		transport := options.Transport
+		if legacyTransport, isLegacy := transport.(adapter.LegacyDNSTransport); isLegacy {
+			if options.Strategy == C.DomainStrategyAsIS {
+				options.Strategy = r.defaultDomainStrategy
+			}
+			if !options.ClientSubnet.IsValid() {
+				options.ClientSubnet = legacyTransport.LegacyClientSubnet()
+			}
+		}
+		if options.Strategy == C.DomainStrategyAsIS {
+			options.Strategy = r.defaultDomainStrategy
+		}
+		responseAddrs, err = r.client.Lookup(ctx, transport, domain, options, nil)
+	} else {
+		var (
+			transport adapter.DNSTransport
+			rule      adapter.DNSRule
+			ruleIndex int
+		)
+		ruleIndex = -1
+		for {
+			dnsCtx := adapter.OverrideContext(ctx)
+			transport, rule, ruleIndex = r.matchDNS(ctx, false, ruleIndex, true, &options)
+			if rule != nil {
+				switch action := rule.Action().(type) {
+				case *R.RuleActionReject:
+					switch action.Method {
+					case C.RuleActionRejectMethodDefault:
+						return nil, nil
+					case C.RuleActionRejectMethodDrop:
+						return nil, tun.ErrDrop
+					}
+				}
+			}
+			var responseCheck func(responseAddrs []netip.Addr) bool
+			if rule != nil && rule.WithAddressLimit() {
+				responseCheck = func(responseAddrs []netip.Addr) bool {
+					metadata.DestinationAddresses = responseAddrs
+					return rule.MatchAddressLimit(metadata)
+				}
+			}
+			if options.Strategy == C.DomainStrategyAsIS {
+				options.Strategy = r.defaultDomainStrategy
+			}
+			responseAddrs, err = r.client.Lookup(dnsCtx, transport, domain, options, responseCheck)
+			if responseCheck == nil || err == nil {
+				break
+			}
+			printResult()
+		}
+	}
+	printResult()
+	if len(responseAddrs) > 0 {
+		r.logger.InfoContext(ctx, "lookup succeed for ", domain, ": ", strings.Join(F.MapToString(responseAddrs), " "))
+	}
+	return responseAddrs, err
+}
+
+func isAddressQuery(message *mDNS.Msg) bool {
+	for _, question := range message.Question {
+		if question.Qtype == mDNS.TypeA || question.Qtype == mDNS.TypeAAAA || question.Qtype == mDNS.TypeHTTPS {
+			return true
+		}
+	}
+	return false
+}
+
+func (r *Router) ClearCache() {
+	r.client.ClearCache()
+	if r.platformInterface != nil {
+		r.platformInterface.ClearDNSCache()
+	}
+}
+
+func (r *Router) LookupReverseMapping(ip netip.Addr) (string, bool) {
+	if r.dnsReverseMapping == nil {
+		return "", false
+	}
+	domain, loaded := r.dnsReverseMapping.Get(ip)
+	return domain, loaded
+}
+
+func (r *Router) ResetNetwork() {
+	r.ClearCache()
+	for _, transport := range r.transport.Transports() {
+		transport.Reset()
+	}
+}

dns/transport/dhcp/dhcp.go

@@ -3,9 +3,6 @@ package dhcp
 import (
 	"context"
 	"net"
-	"net/netip"
-	"net/url"
-	"os"
 	"runtime"
 	"strings"
 	"sync"
@@ -14,13 +11,18 @@ import (
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/dialer"
 	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/dns/transport"
+	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
-	"github.com/sagernet/sing-dns"
 	"github.com/sagernet/sing-tun"
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/buf"
 	"github.com/sagernet/sing/common/control"
 	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
 	"github.com/sagernet/sing/common/task"
 	"github.com/sagernet/sing/common/x/list"
 	"github.com/sagernet/sing/service"
@@ -29,76 +31,70 @@ import (
 	mDNS "github.com/miekg/dns"
 )
 
-func init() {
-	dns.RegisterTransport([]string{"dhcp"}, func(options dns.TransportOptions) (dns.Transport, error) {
-		return NewTransport(options)
-	})
+func RegisterTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.DHCPDNSServerOptions](registry, C.DNSTypeDHCP, NewTransport)
 }
 
+var _ adapter.DNSTransport = (*Transport)(nil)
+
 type Transport struct {
-	options           dns.TransportOptions
-	router            adapter.Router
+	dns.TransportAdapter
+	ctx               context.Context
+	dialer            N.Dialer
+	logger            logger.ContextLogger
 	networkManager    adapter.NetworkManager
 	interfaceName     string
-	autoInterface     bool
 	interfaceCallback *list.Element[tun.DefaultInterfaceUpdateCallback]
-	transports        []dns.Transport
+	transports        []adapter.DNSTransport
 	updateAccess      sync.Mutex
 	updatedAt         time.Time
 }
 
-func NewTransport(options dns.TransportOptions) (*Transport, error) {
-	linkURL, err := url.Parse(options.Address)
+func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.DHCPDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewLocalDialer(ctx, options.LocalDNSServerOptions)
 	if err != nil {
 		return nil, err
 	}
-	if linkURL.Host == "" {
-		return nil, E.New("missing interface name for DHCP")
-	}
-	transport := &Transport{
-		options:        options,
-		networkManager: service.FromContext[adapter.NetworkManager](options.Context),
-		interfaceName:  linkURL.Host,
-		autoInterface:  linkURL.Host == "auto",
-	}
-	return transport, nil
+	return &Transport{
+		TransportAdapter: dns.NewTransportAdapterWithLocalOptions(C.DNSTypeDHCP, tag, options.LocalDNSServerOptions),
+		ctx:              ctx,
+		dialer:           transportDialer,
+		logger:           logger,
+		networkManager:   service.FromContext[adapter.NetworkManager](ctx),
+		interfaceName:    options.Interface,
+	}, nil
 }
 
-func (t *Transport) Name() string {
-	return t.options.Name
-}
-
-func (t *Transport) Start() error {
+func (t *Transport) Start(stage adapter.StartStage) error {
+	if stage != adapter.StartStateStart {
+		return nil
+	}
 	err := t.fetchServers()
 	if err != nil {
 		return err
 	}
-	if t.autoInterface {
+	if t.interfaceName == "" {
 		t.interfaceCallback = t.networkManager.InterfaceMonitor().RegisterCallback(t.interfaceUpdated)
 	}
 	return nil
 }
 
+func (t *Transport) Close() error {
+	for _, transport := range t.transports {
+		transport.Reset()
+	}
+	if t.interfaceCallback != nil {
+		t.networkManager.InterfaceMonitor().UnregisterCallback(t.interfaceCallback)
+	}
+	return nil
+}
+
 func (t *Transport) Reset() {
 	for _, transport := range t.transports {
 		transport.Reset()
 	}
 }
 
-func (t *Transport) Close() error {
-	for _, transport := range t.transports {
-		transport.Close()
-	}
-	if t.interfaceCallback != nil {
-		t.networkManager.InterfaceMonitor().UnregisterCallback(t.interfaceCallback)
-	}
-	return nil
-}
-
-func (t *Transport) Raw() bool {
-	return true
-}
-
 func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
 	err := t.fetchServers()
 	if err != nil {
@@ -120,7 +116,7 @@ func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg,
 }
 
 func (t *Transport) fetchInterface() (*control.Interface, error) {
-	if t.autoInterface {
+	if t.interfaceName == "" {
 		if t.networkManager.InterfaceMonitor() == nil {
 			return nil, E.New("missing monitor for auto DHCP, set route.auto_detect_interface")
 		}
@@ -152,8 +148,8 @@ func (t *Transport) updateServers() error {
 		return E.Cause(err, "dhcp: prepare interface")
 	}
 
-	t.options.Logger.Info("dhcp: query DNS servers on ", iface.Name)
-	fetchCtx, cancel := context.WithTimeout(t.options.Context, C.DHCPTimeout)
+	t.logger.Info("dhcp: query DNS servers on ", iface.Name)
+	fetchCtx, cancel := context.WithTimeout(t.ctx, C.DHCPTimeout)
 	err = t.fetchServers0(fetchCtx, iface)
 	cancel()
 	if err != nil {
@@ -169,7 +165,7 @@ func (t *Transport) updateServers() error {
 func (t *Transport) interfaceUpdated(defaultInterface *control.Interface, flags int) {
 	err := t.updateServers()
 	if err != nil {
-		t.options.Logger.Error("update servers: ", err)
+		t.logger.Error("update servers: ", err)
 	}
 }
 
@@ -181,7 +177,7 @@ func (t *Transport) fetchServers0(ctx context.Context, iface *control.Interface)
 	if runtime.GOOS == "linux" || runtime.GOOS == "android" {
 		listenAddr = "255.255.255.255:68"
 	}
-	packetConn, err := listener.ListenPacket(t.options.Context, "udp4", listenAddr)
+	packetConn, err := listener.ListenPacket(t.ctx, "udp4", listenAddr)
 	if err != nil {
 		return err
 	}
@@ -219,17 +215,17 @@ func (t *Transport) fetchServersResponse(iface *control.Interface, packetConn ne
 
 		dhcpPacket, err := dhcpv4.FromBytes(buffer.Bytes())
 		if err != nil {
-			t.options.Logger.Trace("dhcp: parse DHCP response: ", err)
+			t.logger.Trace("dhcp: parse DHCP response: ", err)
 			return err
 		}
 
 		if dhcpPacket.MessageType() != dhcpv4.MessageTypeOffer {
-			t.options.Logger.Trace("dhcp: expected OFFER response, but got ", dhcpPacket.MessageType())
+			t.logger.Trace("dhcp: expected OFFER response, but got ", dhcpPacket.MessageType())
 			continue
 		}
 
 		if dhcpPacket.TransactionID != transactionID {
-			t.options.Logger.Trace("dhcp: expected transaction ID ", transactionID, ", but got ", dhcpPacket.TransactionID)
+			t.logger.Trace("dhcp: expected transaction ID ", transactionID, ", but got ", dhcpPacket.TransactionID)
 			continue
 		}
 
@@ -237,44 +233,27 @@ func (t *Transport) fetchServersResponse(iface *control.Interface, packetConn ne
 		if len(dns) == 0 {
 			return nil
 		}
-
-		var addrs []netip.Addr
-		for _, ip := range dns {
-			addr, _ := netip.AddrFromSlice(ip)
-			addrs = append(addrs, addr.Unmap())
-		}
-		return t.recreateServers(iface, addrs)
+		return t.recreateServers(iface, common.Map(dns, func(it net.IP) M.Socksaddr {
+			return M.SocksaddrFrom(M.AddrFromIP(it), 53)
+		}))
 	}
 }
 
-func (t *Transport) recreateServers(iface *control.Interface, serverAddrs []netip.Addr) error {
+func (t *Transport) recreateServers(iface *control.Interface, serverAddrs []M.Socksaddr) error {
 	if len(serverAddrs) > 0 {
-		t.options.Logger.Info("dhcp: updated DNS servers from ", iface.Name, ": [", strings.Join(common.Map(serverAddrs, func(it netip.Addr) string {
-			return it.String()
-		}), ","), "]")
+		t.logger.Info("dhcp: updated DNS servers from ", iface.Name, ": [", strings.Join(common.Map(serverAddrs, M.Socksaddr.String), ","), "]")
 	}
-	serverDialer := common.Must1(dialer.NewDefault(t.options.Context, option.DialerOptions{
+	serverDialer := common.Must1(dialer.NewDefault(t.ctx, option.DialerOptions{
 		BindInterface:      iface.Name,
 		UDPFragmentDefault: true,
 	}))
-	var transports []dns.Transport
+	var transports []adapter.DNSTransport
 	for _, serverAddr := range serverAddrs {
-		newOptions := t.options
-		newOptions.Address = serverAddr.String()
-		newOptions.Dialer = serverDialer
-		serverTransport, err := dns.NewUDPTransport(newOptions)
-		if err != nil {
-			return E.Cause(err, "create UDP transport from DHCP result: ", serverAddr)
-		}
-		transports = append(transports, serverTransport)
+		transports = append(transports, transport.NewUDPRaw(t.logger, t.TransportAdapter, serverDialer, serverAddr))
 	}
 	for _, transport := range t.transports {
-		transport.Close()
+		transport.Reset()
 	}
 	t.transports = transports
 	return nil
 }
-
-func (t *Transport) Lookup(ctx context.Context, domain string, strategy dns.DomainStrategy) ([]netip.Addr, error) {
-	return nil, os.ErrInvalid
-}

dns/transport/fakeip/fakeip.go

@@ -0,0 +1,67 @@
+package fakeip
+
+import (
+	"context"
+	"net/netip"
+
+	"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"
+
+	mDNS "github.com/miekg/dns"
+)
+
+func RegisterTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.FakeIPDNSServerOptions](registry, C.DNSTypeFakeIP, NewTransport)
+}
+
+var _ adapter.FakeIPTransport = (*Transport)(nil)
+
+type Transport struct {
+	dns.TransportAdapter
+	logger logger.ContextLogger
+	store  adapter.FakeIPStore
+}
+
+func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.FakeIPDNSServerOptions) (adapter.DNSTransport, error) {
+	store := NewStore(ctx, logger, options.Inet4Range.Build(netip.Prefix{}), options.Inet6Range.Build(netip.Prefix{}))
+	return &Transport{
+		TransportAdapter: dns.NewTransportAdapter(C.DNSTypeFakeIP, tag, nil),
+		logger:           logger,
+		store:            store,
+	}, nil
+}
+
+func (t *Transport) Start(stage adapter.StartStage) error {
+	if stage != adapter.StartStateStart {
+		return nil
+	}
+	return t.store.Start()
+}
+
+func (t *Transport) Close() error {
+	return t.store.Close()
+}
+
+func (t *Transport) Reset() {
+}
+
+func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	question := message.Question[0]
+	if question.Qtype != mDNS.TypeA && question.Qtype != mDNS.TypeAAAA {
+		return nil, E.New("only IP queries are supported by fakeip")
+	}
+	address, err := t.store.Create(question.Name, question.Qtype == mDNS.TypeAAAA)
+	if err != nil {
+		return nil, err
+	}
+	return dns.FixedResponse(message.Id, question, []netip.Addr{address}, C.DefaultDNSTTL), nil
+}
+
+func (t *Transport) Store() adapter.FakeIPStore {
+	return t.store
+}

dns/transport/hosts/hosts.go

@@ -0,0 +1,63 @@
+package hosts
+
+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"
+
+	mDNS "github.com/miekg/dns"
+)
+
+func RegisterTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.HostsDNSServerOptions](registry, C.DNSTypeHosts, NewTransport)
+}
+
+var _ adapter.DNSTransport = (*Transport)(nil)
+
+type Transport struct {
+	dns.TransportAdapter
+	files []*File
+}
+
+func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.HostsDNSServerOptions) (adapter.DNSTransport, error) {
+	var files []*File
+	if len(options.Path) == 0 {
+		files = append(files, NewFile(DefaultPath))
+	} else {
+		for _, path := range options.Path {
+			files = append(files, NewFile(path))
+		}
+	}
+	return &Transport{
+		TransportAdapter: dns.NewTransportAdapter(C.DNSTypeHosts, tag, nil),
+		files:            files,
+	}, nil
+}
+
+func (t *Transport) Reset() {
+}
+
+func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	question := message.Question[0]
+	domain := dns.FqdnToDomain(question.Name)
+	if question.Qtype == mDNS.TypeA || question.Qtype == mDNS.TypeAAAA {
+		for _, file := range t.files {
+			addresses := file.Lookup(domain)
+			if len(addresses) > 0 {
+				return dns.FixedResponse(message.Id, question, addresses, C.DefaultDNSTTL), nil
+			}
+		}
+	}
+	return &mDNS.Msg{
+		MsgHdr: mDNS.MsgHdr{
+			Id:       message.Id,
+			Rcode:    mDNS.RcodeNameError,
+			Response: true,
+		},
+		Question: []mDNS.Question{question},
+	}, nil
+}

dns/transport/hosts/hosts_file.go

@@ -0,0 +1,102 @@
+package hosts
+
+import (
+	"bufio"
+	"errors"
+	"io"
+	"net/netip"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/miekg/dns"
+)
+
+const cacheMaxAge = 5 * time.Second
+
+type File struct {
+	path    string
+	access  sync.Mutex
+	byName  map[string][]netip.Addr
+	expire  time.Time
+	modTime time.Time
+	size    int64
+}
+
+func NewFile(path string) *File {
+	return &File{
+		path: path,
+	}
+}
+
+func (f *File) Lookup(name string) []netip.Addr {
+	f.access.Lock()
+	defer f.access.Unlock()
+	f.update()
+	return f.byName[name]
+}
+
+func (f *File) update() {
+	now := time.Now()
+	if now.Before(f.expire) && len(f.byName) > 0 {
+		return
+	}
+	stat, err := os.Stat(f.path)
+	if err != nil {
+		return
+	}
+	if f.modTime.Equal(stat.ModTime()) && f.size == stat.Size() {
+		f.expire = now.Add(cacheMaxAge)
+		return
+	}
+	byName := make(map[string][]netip.Addr)
+	file, err := os.Open(f.path)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+	reader := bufio.NewReader(file)
+	var (
+		prefix   []byte
+		line     []byte
+		isPrefix bool
+	)
+	for {
+		line, isPrefix, err = reader.ReadLine()
+		if err != nil {
+			if errors.Is(err, io.EOF) {
+				break
+			}
+			return
+		}
+		if isPrefix {
+			prefix = append(prefix, line...)
+			continue
+		} else if len(prefix) > 0 {
+			line = append(prefix, line...)
+			prefix = nil
+		}
+		commentIndex := strings.IndexRune(string(line), '#')
+		if commentIndex != -1 {
+			line = line[:commentIndex]
+		}
+		fields := strings.Fields(string(line))
+		if len(fields) < 2 {
+			continue
+		}
+		var addr netip.Addr
+		addr, err = netip.ParseAddr(fields[0])
+		if err != nil {
+			continue
+		}
+		for index := 1; index < len(fields); index++ {
+			canonicalName := dns.CanonicalName(fields[index])
+			byName[canonicalName] = append(byName[canonicalName], addr)
+		}
+	}
+	f.expire = now.Add(cacheMaxAge)
+	f.modTime = stat.ModTime()
+	f.size = stat.Size()
+	f.byName = byName
+}

dns/transport/hosts/hosts_test.go

@@ -0,0 +1,16 @@
+package hosts_test
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/sagernet/sing-box/dns/transport/hosts"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestHosts(t *testing.T) {
+	t.Parallel()
+	require.Equal(t, []netip.Addr{netip.AddrFrom4([4]byte{127, 0, 0, 1}), netip.IPv6Loopback()}, hosts.NewFile("testdata/hosts").Lookup("localhost."))
+	require.NotEmpty(t, hosts.NewFile(hosts.DefaultPath).Lookup("localhost."))
+}

dns/transport/hosts/hosts_unix.go

@@ -0,0 +1,5 @@
+//go:build !windows
+
+package hosts
+
+var DefaultPath = "/etc/hosts"

dns/transport/hosts/hosts_windows.go

@@ -0,0 +1,17 @@
+package hosts
+
+import (
+	"path/filepath"
+
+	"golang.org/x/sys/windows"
+)
+
+var DefaultPath string
+
+func init() {
+	systemDirectory, err := windows.GetSystemDirectory()
+	if err != nil {
+		systemDirectory = "C:\\Windows\\System32"
+	}
+	DefaultPath = filepath.Join(systemDirectory, "Drivers/etc/hosts")
+}

dns/transport/hosts/testdata/hosts

@@ -0,0 +1,2 @@
+127.0.0.1       localhost
+::1             localhost

dns/transport/https.go

@@ -0,0 +1,204 @@
+package transport
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/tls"
+	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"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	aTLS "github.com/sagernet/sing/common/tls"
+	sHTTP "github.com/sagernet/sing/protocol/http"
+
+	mDNS "github.com/miekg/dns"
+	"golang.org/x/net/http2"
+)
+
+const MimeType = "application/dns-message"
+
+var _ adapter.DNSTransport = (*HTTPSTransport)(nil)
+
+func RegisterHTTPS(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.RemoteHTTPSDNSServerOptions](registry, C.DNSTypeHTTPS, NewHTTPS)
+}
+
+type HTTPSTransport struct {
+	dns.TransportAdapter
+	logger      logger.ContextLogger
+	dialer      N.Dialer
+	destination *url.URL
+	headers     http.Header
+	transport   *http.Transport
+}
+
+func NewHTTPS(ctx context.Context, logger log.ContextLogger, tag string, options option.RemoteHTTPSDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewRemoteDialer(ctx, options.RemoteDNSServerOptions)
+	if err != nil {
+		return nil, err
+	}
+	tlsOptions := common.PtrValueOrDefault(options.TLS)
+	tlsOptions.Enabled = true
+	tlsConfig, err := tls.NewClient(ctx, options.Server, tlsOptions)
+	if err != nil {
+		return nil, err
+	}
+	if common.Error(tlsConfig.Config()) == nil && !common.Contains(tlsConfig.NextProtos(), http2.NextProtoTLS) {
+		tlsConfig.SetNextProtos(append(tlsConfig.NextProtos(), http2.NextProtoTLS))
+	}
+	if !common.Contains(tlsConfig.NextProtos(), "http/1.1") {
+		tlsConfig.SetNextProtos(append(tlsConfig.NextProtos(), "http/1.1"))
+	}
+	headers := options.Headers.Build()
+	host := headers.Get("Host")
+	if host != "" {
+		headers.Del("Host")
+	} else {
+		if tlsConfig.ServerName() != "" {
+			host = tlsConfig.ServerName()
+		} else {
+			host = options.Server
+		}
+	}
+	destinationURL := url.URL{
+		Scheme: "https",
+		Host:   host,
+	}
+	if destinationURL.Host == "" {
+		destinationURL.Host = options.Server
+	}
+	if options.ServerPort != 0 && options.ServerPort != 443 {
+		destinationURL.Host = net.JoinHostPort(destinationURL.Host, strconv.Itoa(int(options.ServerPort)))
+	}
+	path := options.Path
+	if path == "" {
+		path = "/dns-query"
+	}
+	err = sHTTP.URLSetPath(&destinationURL, path)
+	if err != nil {
+		return nil, err
+	}
+	serverAddr := options.ServerOptions.Build()
+	if serverAddr.Port == 0 {
+		serverAddr.Port = 443
+	}
+	return NewHTTPSRaw(
+		dns.NewTransportAdapterWithRemoteOptions(C.DNSTypeHTTPS, tag, options.RemoteDNSServerOptions),
+		logger,
+		transportDialer,
+		&destinationURL,
+		headers,
+		serverAddr,
+		tlsConfig,
+	), nil
+}
+
+func NewHTTPSRaw(
+	adapter dns.TransportAdapter,
+	logger log.ContextLogger,
+	dialer N.Dialer,
+	destination *url.URL,
+	headers http.Header,
+	serverAddr M.Socksaddr,
+	tlsConfig tls.Config,
+) *HTTPSTransport {
+	var transport *http.Transport
+	if tlsConfig != nil {
+		transport = &http.Transport{
+			ForceAttemptHTTP2: true,
+			DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				tcpConn, hErr := dialer.DialContext(ctx, network, serverAddr)
+				if hErr != nil {
+					return nil, hErr
+				}
+				tlsConn, hErr := aTLS.ClientHandshake(ctx, tcpConn, tlsConfig)
+				if hErr != nil {
+					tcpConn.Close()
+					return nil, hErr
+				}
+				return tlsConn, nil
+			},
+		}
+	} else {
+		transport = &http.Transport{
+			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				return dialer.DialContext(ctx, network, serverAddr)
+			},
+		}
+	}
+	return &HTTPSTransport{
+		TransportAdapter: adapter,
+		logger:           logger,
+		dialer:           dialer,
+		destination:      destination,
+		headers:          headers,
+		transport:        transport,
+	}
+}
+
+func (t *HTTPSTransport) Reset() {
+	t.transport.CloseIdleConnections()
+	t.transport = t.transport.Clone()
+}
+
+func (t *HTTPSTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	exMessage := *message
+	exMessage.Id = 0
+	exMessage.Compress = true
+	requestBuffer := buf.NewSize(1 + message.Len())
+	rawMessage, err := exMessage.PackBuffer(requestBuffer.FreeBytes())
+	if err != nil {
+		requestBuffer.Release()
+		return nil, err
+	}
+	request, err := http.NewRequestWithContext(ctx, http.MethodPost, t.destination.String(), bytes.NewReader(rawMessage))
+	if err != nil {
+		requestBuffer.Release()
+		return nil, err
+	}
+	request.Header = t.headers.Clone()
+	request.Header.Set("Content-Type", MimeType)
+	request.Header.Set("Accept", MimeType)
+	response, err := t.transport.RoundTrip(request)
+	requestBuffer.Release()
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return nil, E.New("unexpected status: ", response.Status)
+	}
+	var responseMessage mDNS.Msg
+	if response.ContentLength > 0 {
+		responseBuffer := buf.NewSize(int(response.ContentLength))
+		_, err = responseBuffer.ReadFullFrom(response.Body, int(response.ContentLength))
+		if err != nil {
+			return nil, err
+		}
+		err = responseMessage.Unpack(responseBuffer.Bytes())
+		responseBuffer.Release()
+	} else {
+		rawMessage, err = io.ReadAll(response.Body)
+		if err != nil {
+			return nil, err
+		}
+		err = responseMessage.Unpack(rawMessage)
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &responseMessage, nil
+}

dns/transport/local/local.go

@@ -0,0 +1,195 @@
+package local
+
+import (
+	"context"
+	"math/rand"
+	"time"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/dns/transport/hosts"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	mDNS "github.com/miekg/dns"
+)
+
+func RegisterTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.LocalDNSServerOptions](registry, C.DNSTypeLocal, NewTransport)
+}
+
+var _ adapter.DNSTransport = (*Transport)(nil)
+
+type Transport struct {
+	dns.TransportAdapter
+	hosts  *hosts.File
+	dialer N.Dialer
+}
+
+func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.LocalDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewLocalDialer(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+	return &Transport{
+		TransportAdapter: dns.NewTransportAdapterWithLocalOptions(C.DNSTypeLocal, tag, options),
+		hosts:            hosts.NewFile(hosts.DefaultPath),
+		dialer:           transportDialer,
+	}, nil
+}
+
+func (t *Transport) Reset() {
+}
+
+func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	question := message.Question[0]
+	domain := dns.FqdnToDomain(question.Name)
+	if question.Qtype == mDNS.TypeA || question.Qtype == mDNS.TypeAAAA {
+		addresses := t.hosts.Lookup(domain)
+		if len(addresses) > 0 {
+			return dns.FixedResponse(message.Id, question, addresses, C.DefaultDNSTTL), nil
+		}
+	}
+	systemConfig := getSystemDNSConfig()
+	if systemConfig.singleRequest || !(message.Question[0].Qtype == mDNS.TypeA || message.Question[0].Qtype == mDNS.TypeAAAA) {
+		return t.exchangeSingleRequest(ctx, systemConfig, message, domain)
+	} else {
+		return t.exchangeParallel(ctx, systemConfig, message, domain)
+	}
+}
+
+func (t *Transport) exchangeSingleRequest(ctx context.Context, systemConfig *dnsConfig, message *mDNS.Msg, domain string) (*mDNS.Msg, error) {
+	var lastErr error
+	for _, fqdn := range systemConfig.nameList(domain) {
+		response, err := t.tryOneName(ctx, systemConfig, fqdn, message)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+		return response, nil
+	}
+	return nil, lastErr
+}
+
+func (t *Transport) exchangeParallel(ctx context.Context, systemConfig *dnsConfig, message *mDNS.Msg, domain string) (*mDNS.Msg, error) {
+	returned := make(chan struct{})
+	defer close(returned)
+	type queryResult struct {
+		response *mDNS.Msg
+		err      error
+	}
+	results := make(chan queryResult)
+	startRacer := func(ctx context.Context, fqdn string) {
+		response, err := t.tryOneName(ctx, systemConfig, fqdn, message)
+		addresses, _ := dns.MessageToAddresses(response)
+		if len(addresses) == 0 {
+			err = E.New(fqdn, ": empty result")
+		}
+		select {
+		case results <- queryResult{response, err}:
+		case <-returned:
+		}
+	}
+	queryCtx, queryCancel := context.WithCancel(ctx)
+	defer queryCancel()
+	var nameCount int
+	for _, fqdn := range systemConfig.nameList(domain) {
+		nameCount++
+		go startRacer(queryCtx, fqdn)
+	}
+	var errors []error
+	for {
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		case result := <-results:
+			if result.err == nil {
+				return result.response, nil
+			}
+			errors = append(errors, result.err)
+			if len(errors) == nameCount {
+				return nil, E.Errors(errors...)
+			}
+		}
+	}
+}
+
+func (t *Transport) tryOneName(ctx context.Context, config *dnsConfig, fqdn string, message *mDNS.Msg) (*mDNS.Msg, error) {
+	serverOffset := config.serverOffset()
+	sLen := uint32(len(config.servers))
+	var lastErr error
+	for i := 0; i < config.attempts; i++ {
+		for j := uint32(0); j < sLen; j++ {
+			server := config.servers[(serverOffset+j)%sLen]
+			question := message.Question[0]
+			question.Name = fqdn
+			response, err := t.exchangeOne(ctx, M.ParseSocksaddr(server), question, config.timeout, config.useTCP, config.trustAD)
+			if err != nil {
+				lastErr = err
+				continue
+			}
+			return response, nil
+		}
+	}
+	return nil, E.Cause(lastErr, fqdn)
+}
+
+func (t *Transport) exchangeOne(ctx context.Context, server M.Socksaddr, question mDNS.Question, timeout time.Duration, useTCP, ad bool) (*mDNS.Msg, error) {
+	var networks []string
+	if useTCP {
+		networks = []string{N.NetworkTCP}
+	} else {
+		networks = []string{N.NetworkUDP, N.NetworkTCP}
+	}
+	request := &mDNS.Msg{
+		MsgHdr: mDNS.MsgHdr{
+			Id:                uint16(rand.Uint32()),
+			RecursionDesired:  true,
+			AuthenticatedData: ad,
+		},
+		Question: []mDNS.Question{question},
+		Compress: true,
+	}
+	request.SetEdns0(maxDNSPacketSize, false)
+	buffer := buf.Get(buf.UDPBufferSize)
+	defer buf.Put(buffer)
+	for _, network := range networks {
+		ctx, cancel := context.WithDeadline(ctx, time.Now().Add(timeout))
+		defer cancel()
+		conn, err := t.dialer.DialContext(ctx, network, server)
+		if err != nil {
+			return nil, err
+		}
+		defer conn.Close()
+		if deadline, loaded := ctx.Deadline(); loaded && !deadline.IsZero() {
+			conn.SetDeadline(deadline)
+		}
+		rawMessage, err := request.PackBuffer(buffer)
+		if err != nil {
+			return nil, E.Cause(err, "pack request")
+		}
+		_, err = conn.Write(rawMessage)
+		if err != nil {
+			return nil, E.Cause(err, "write request")
+		}
+		n, err := conn.Read(buffer)
+		if err != nil {
+			return nil, E.Cause(err, "read response")
+		}
+		var response mDNS.Msg
+		err = response.Unpack(buffer[:n])
+		if err != nil {
+			return nil, E.Cause(err, "unpack response")
+		}
+		if response.Truncated && network == N.NetworkUDP {
+			continue
+		}
+		return &response, nil
+	}
+	panic("unexpected")
+}

dns/transport/local/resolv.go

@@ -0,0 +1,146 @@
+package local
+
+import (
+	"os"
+	"runtime"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+const (
+	// net.maxDNSPacketSize
+	maxDNSPacketSize = 1232
+)
+
+type resolverConfig struct {
+	initOnce    sync.Once
+	ch          chan struct{}
+	lastChecked time.Time
+	dnsConfig   atomic.Pointer[dnsConfig]
+}
+
+var resolvConf resolverConfig
+
+func getSystemDNSConfig() *dnsConfig {
+	resolvConf.tryUpdate("/etc/resolv.conf")
+	return resolvConf.dnsConfig.Load()
+}
+
+func (conf *resolverConfig) init() {
+	conf.dnsConfig.Store(dnsReadConfig("/etc/resolv.conf"))
+	conf.lastChecked = time.Now()
+	conf.ch = make(chan struct{}, 1)
+}
+
+func (conf *resolverConfig) tryUpdate(name string) {
+	conf.initOnce.Do(conf.init)
+
+	if conf.dnsConfig.Load().noReload {
+		return
+	}
+	if !conf.tryAcquireSema() {
+		return
+	}
+	defer conf.releaseSema()
+
+	now := time.Now()
+	if conf.lastChecked.After(now.Add(-5 * time.Second)) {
+		return
+	}
+	conf.lastChecked = now
+	if runtime.GOOS != "windows" {
+		var mtime time.Time
+		if fi, err := os.Stat(name); err == nil {
+			mtime = fi.ModTime()
+		}
+		if mtime.Equal(conf.dnsConfig.Load().mtime) {
+			return
+		}
+	}
+	dnsConf := dnsReadConfig(name)
+	conf.dnsConfig.Store(dnsConf)
+}
+
+func (conf *resolverConfig) tryAcquireSema() bool {
+	select {
+	case conf.ch <- struct{}{}:
+		return true
+	default:
+		return false
+	}
+}
+
+func (conf *resolverConfig) releaseSema() {
+	<-conf.ch
+}
+
+type dnsConfig struct {
+	servers       []string
+	search        []string
+	ndots         int
+	timeout       time.Duration
+	attempts      int
+	rotate        bool
+	unknownOpt    bool
+	lookup        []string
+	err           error
+	mtime         time.Time
+	soffset       uint32
+	singleRequest bool
+	useTCP        bool
+	trustAD       bool
+	noReload      bool
+}
+
+func (c *dnsConfig) serverOffset() uint32 {
+	if c.rotate {
+		return atomic.AddUint32(&c.soffset, 1) - 1 // return 0 to start
+	}
+	return 0
+}
+
+func (conf *dnsConfig) nameList(name string) []string {
+	l := len(name)
+	rooted := l > 0 && name[l-1] == '.'
+	if l > 254 || l == 254 && !rooted {
+		return nil
+	}
+
+	if rooted {
+		if avoidDNS(name) {
+			return nil
+		}
+		return []string{name}
+	}
+
+	hasNdots := strings.Count(name, ".") >= conf.ndots
+	name += "."
+	// l++
+
+	names := make([]string, 0, 1+len(conf.search))
+	if hasNdots && !avoidDNS(name) {
+		names = append(names, name)
+	}
+	for _, suffix := range conf.search {
+		fqdn := name + suffix
+		if !avoidDNS(fqdn) && len(fqdn) <= 254 {
+			names = append(names, fqdn)
+		}
+	}
+	if !hasNdots && !avoidDNS(name) {
+		names = append(names, name)
+	}
+	return names
+}
+
+func avoidDNS(name string) bool {
+	if name == "" {
+		return true
+	}
+	if name[len(name)-1] == '.' {
+		name = name[:len(name)-1]
+	}
+	return strings.HasSuffix(name, ".onion")
+}

dns/transport/local/resolv_unix.go

@@ -0,0 +1,175 @@
+//go:build !windows
+
+package local
+
+import (
+	"bufio"
+	"net"
+	"net/netip"
+	"os"
+	"strings"
+	"time"
+	_ "unsafe"
+)
+
+func dnsReadConfig(name string) *dnsConfig {
+	conf := &dnsConfig{
+		ndots:    1,
+		timeout:  5 * time.Second,
+		attempts: 2,
+	}
+	file, err := os.Open(name)
+	if err != nil {
+		conf.servers = defaultNS
+		conf.search = dnsDefaultSearch()
+		conf.err = err
+		return conf
+	}
+	defer file.Close()
+	fi, err := file.Stat()
+	if err == nil {
+		conf.mtime = fi.ModTime()
+	} else {
+		conf.servers = defaultNS
+		conf.search = dnsDefaultSearch()
+		conf.err = err
+		return conf
+	}
+	reader := bufio.NewReader(file)
+	var (
+		prefix   []byte
+		line     []byte
+		isPrefix bool
+	)
+	for {
+		line, isPrefix, err = reader.ReadLine()
+		if err != nil {
+			break
+		}
+		if isPrefix {
+			prefix = append(prefix, line...)
+			continue
+		} else if len(prefix) > 0 {
+			line = append(prefix, line...)
+			prefix = nil
+		}
+		if len(line) > 0 && (line[0] == ';' || line[0] == '#') {
+			continue
+		}
+		f := strings.Fields(string(line))
+		if len(f) < 1 {
+			continue
+		}
+		switch f[0] {
+		case "nameserver":
+			if len(f) > 1 && len(conf.servers) < 3 {
+				if _, err := netip.ParseAddr(f[1]); err == nil {
+					conf.servers = append(conf.servers, net.JoinHostPort(f[1], "53"))
+				}
+			}
+		case "domain":
+			if len(f) > 1 {
+				conf.search = []string{ensureRooted(f[1])}
+			}
+
+		case "search":
+			conf.search = make([]string, 0, len(f)-1)
+			for i := 1; i < len(f); i++ {
+				name := ensureRooted(f[i])
+				if name == "." {
+					continue
+				}
+				conf.search = append(conf.search, name)
+			}
+
+		case "options":
+			for _, s := range f[1:] {
+				switch {
+				case strings.HasPrefix(s, "ndots:"):
+					n, _, _ := dtoi(s[6:])
+					if n < 0 {
+						n = 0
+					} else if n > 15 {
+						n = 15
+					}
+					conf.ndots = n
+				case strings.HasPrefix(s, "timeout:"):
+					n, _, _ := dtoi(s[8:])
+					if n < 1 {
+						n = 1
+					}
+					conf.timeout = time.Duration(n) * time.Second
+				case strings.HasPrefix(s, "attempts:"):
+					n, _, _ := dtoi(s[9:])
+					if n < 1 {
+						n = 1
+					}
+					conf.attempts = n
+				case s == "rotate":
+					conf.rotate = true
+				case s == "single-request" || s == "single-request-reopen":
+					conf.singleRequest = true
+				case s == "use-vc" || s == "usevc" || s == "tcp":
+					conf.useTCP = true
+				case s == "trust-ad":
+					conf.trustAD = true
+				case s == "edns0":
+				case s == "no-reload":
+					conf.noReload = true
+				default:
+					conf.unknownOpt = true
+				}
+			}
+
+		case "lookup":
+			conf.lookup = f[1:]
+
+		default:
+			conf.unknownOpt = true
+		}
+	}
+	if len(conf.servers) == 0 {
+		conf.servers = defaultNS
+	}
+	if len(conf.search) == 0 {
+		conf.search = dnsDefaultSearch()
+	}
+	return conf
+}
+
+//go:linkname defaultNS net.defaultNS
+var defaultNS []string
+
+func dnsDefaultSearch() []string {
+	hn, err := os.Hostname()
+	if err != nil {
+		return nil
+	}
+	if i := strings.IndexRune(hn, '.'); i >= 0 && i < len(hn)-1 {
+		return []string{ensureRooted(hn[i+1:])}
+	}
+	return nil
+}
+
+func ensureRooted(s string) string {
+	if len(s) > 0 && s[len(s)-1] == '.' {
+		return s
+	}
+	return s + "."
+}
+
+const big = 0xFFFFFF
+
+func dtoi(s string) (n int, i int, ok bool) {
+	n = 0
+	for i = 0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
+		n = n*10 + int(s[i]-'0')
+		if n >= big {
+			return big, i, false
+		}
+	}
+	if i == 0 {
+		return 0, 0, false
+	}
+	return n, i, true
+}

dns/transport/local/resolv_windows.go

@@ -0,0 +1,100 @@
+package local
+
+import (
+	"net"
+	"net/netip"
+	"os"
+	"syscall"
+	"time"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+func dnsReadConfig(_ string) *dnsConfig {
+	conf := &dnsConfig{
+		ndots:    1,
+		timeout:  5 * time.Second,
+		attempts: 2,
+	}
+	defer func() {
+		if len(conf.servers) == 0 {
+			conf.servers = defaultNS
+		}
+	}()
+	aas, err := adapterAddresses()
+	if err != nil {
+		return nil
+	}
+
+	for _, aa := range aas {
+		// Only take interfaces whose OperStatus is IfOperStatusUp(0x01) into DNS configs.
+		if aa.OperStatus != windows.IfOperStatusUp {
+			continue
+		}
+
+		// Only take interfaces which have at least one gateway
+		if aa.FirstGatewayAddress == nil {
+			continue
+		}
+
+		for dns := aa.FirstDnsServerAddress; dns != nil; dns = dns.Next {
+			sa, err := dns.Address.Sockaddr.Sockaddr()
+			if err != nil {
+				continue
+			}
+			var ip netip.Addr
+			switch sa := sa.(type) {
+			case *syscall.SockaddrInet4:
+				ip = netip.AddrFrom4([4]byte{sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3]})
+			case *syscall.SockaddrInet6:
+				var addr16 [16]byte
+				copy(addr16[:], sa.Addr[:])
+				if addr16[0] == 0xfe && addr16[1] == 0xc0 {
+					// fec0/10 IPv6 addresses are site local anycast DNS
+					// addresses Microsoft sets by default if no other
+					// IPv6 DNS address is set. Site local anycast is
+					// deprecated since 2004, see
+					// https://datatracker.ietf.org/doc/html/rfc3879
+					continue
+				}
+				ip = netip.AddrFrom16(addr16)
+			default:
+				// Unexpected type.
+				continue
+			}
+			conf.servers = append(conf.servers, net.JoinHostPort(ip.String(), "53"))
+		}
+	}
+	return conf
+}
+
+//go:linkname defaultNS net.defaultNS
+var defaultNS []string
+
+func adapterAddresses() ([]*windows.IpAdapterAddresses, error) {
+	var b []byte
+	l := uint32(15000) // recommended initial size
+	for {
+		b = make([]byte, l)
+		const flags = windows.GAA_FLAG_INCLUDE_PREFIX | windows.GAA_FLAG_INCLUDE_GATEWAYS
+		err := windows.GetAdaptersAddresses(syscall.AF_UNSPEC, flags, 0, (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])), &l)
+		if err == nil {
+			if l == 0 {
+				return nil, nil
+			}
+			break
+		}
+		if err.(syscall.Errno) != syscall.ERROR_BUFFER_OVERFLOW {
+			return nil, os.NewSyscallError("getadaptersaddresses", err)
+		}
+		if l <= uint32(len(b)) {
+			return nil, os.NewSyscallError("getadaptersaddresses", err)
+		}
+	}
+	var aas []*windows.IpAdapterAddresses
+	for aa := (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])); aa != nil; aa = aa.Next {
+		aas = append(aas, aa)
+	}
+	return aas, nil
+}

dns/transport/predefined.go

@@ -0,0 +1,82 @@
+package transport
+
+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"
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+
+	mDNS "github.com/miekg/dns"
+)
+
+var _ adapter.DNSTransport = (*PredefinedTransport)(nil)
+
+func RegisterPredefined(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.PredefinedDNSServerOptions](registry, C.DNSTypePreDefined, NewPredefined)
+}
+
+type PredefinedTransport struct {
+	dns.TransportAdapter
+	responses []*predefinedResponse
+}
+
+type predefinedResponse struct {
+	questions []mDNS.Question
+	answer    *mDNS.Msg
+}
+
+func NewPredefined(ctx context.Context, logger log.ContextLogger, tag string, options option.PredefinedDNSServerOptions) (adapter.DNSTransport, error) {
+	var responses []*predefinedResponse
+	for _, response := range options.Responses {
+		questions, msg, err := response.Build()
+		if err != nil {
+			return nil, err
+		}
+		responses = append(responses, &predefinedResponse{
+			questions: questions,
+			answer:    msg,
+		})
+	}
+	if len(responses) == 0 {
+		return nil, E.New("empty predefined responses")
+	}
+	return &PredefinedTransport{
+		TransportAdapter: dns.NewTransportAdapter(C.DNSTypePreDefined, tag, nil),
+		responses:        responses,
+	}, nil
+}
+
+func (t *PredefinedTransport) Reset() {
+}
+
+func (t *PredefinedTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	for _, response := range t.responses {
+		for _, question := range response.questions {
+			if func() bool {
+				if question.Name == "" && question.Qtype == mDNS.TypeNone {
+					return true
+				} else if question.Name == "" {
+					return common.Any(message.Question, func(it mDNS.Question) bool {
+						return it.Qtype == question.Qtype
+					})
+				} else if question.Qtype == mDNS.TypeNone {
+					return common.Any(message.Question, func(it mDNS.Question) bool {
+						return it.Name == question.Name
+					})
+				} else {
+					return common.Contains(message.Question, question)
+				}
+			}() {
+				copyAnswer := *response.answer
+				copyAnswer.Id = message.Id
+				return &copyAnswer, nil
+			}
+		}
+	}
+	return nil, dns.RCodeNameError
+}

dns/transport/quic/http3.go

@@ -0,0 +1,167 @@
+package quic
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+
+	"github.com/sagernet/quic-go"
+	"github.com/sagernet/quic-go/http3"
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/tls"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/dns/transport"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/buf"
+	"github.com/sagernet/sing/common/bufio"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	sHTTP "github.com/sagernet/sing/protocol/http"
+
+	mDNS "github.com/miekg/dns"
+)
+
+var _ adapter.DNSTransport = (*HTTP3Transport)(nil)
+
+func RegisterHTTP3Transport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.RemoteHTTPSDNSServerOptions](registry, C.DNSTypeHTTP3, NewHTTP3)
+}
+
+type HTTP3Transport struct {
+	dns.TransportAdapter
+	logger      logger.ContextLogger
+	dialer      N.Dialer
+	destination *url.URL
+	headers     http.Header
+	transport   *http3.Transport
+}
+
+func NewHTTP3(ctx context.Context, logger log.ContextLogger, tag string, options option.RemoteHTTPSDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewRemoteDialer(ctx, options.RemoteDNSServerOptions)
+	if err != nil {
+		return nil, err
+	}
+	tlsOptions := common.PtrValueOrDefault(options.TLS)
+	tlsOptions.Enabled = true
+	tlsConfig, err := tls.NewClient(ctx, options.Server, tlsOptions)
+	if err != nil {
+		return nil, err
+	}
+	stdConfig, err := tlsConfig.Config()
+	if err != nil {
+		return nil, err
+	}
+	headers := options.Headers.Build()
+	host := headers.Get("Host")
+	if host != "" {
+		headers.Del("Host")
+	} else {
+		if tlsConfig.ServerName() != "" {
+			host = tlsConfig.ServerName()
+		} else {
+			host = options.Server
+		}
+	}
+	destinationURL := url.URL{
+		Scheme: "HTTP3",
+		Host:   host,
+	}
+	if destinationURL.Host == "" {
+		destinationURL.Host = options.Server
+	}
+	if options.ServerPort != 0 && options.ServerPort != 443 {
+		destinationURL.Host = net.JoinHostPort(destinationURL.Host, strconv.Itoa(int(options.ServerPort)))
+	}
+	path := options.Path
+	if path == "" {
+		path = "/dns-query"
+	}
+	err = sHTTP.URLSetPath(&destinationURL, path)
+	if err != nil {
+		return nil, err
+	}
+	serverAddr := options.ServerOptions.Build()
+	if serverAddr.Port == 0 {
+		serverAddr.Port = 443
+	}
+	return &HTTP3Transport{
+		TransportAdapter: dns.NewTransportAdapterWithRemoteOptions(C.DNSTypeHTTP3, tag, options.RemoteDNSServerOptions),
+		logger:           logger,
+		dialer:           transportDialer,
+		destination:      &destinationURL,
+		headers:          headers,
+		transport: &http3.Transport{
+			Dial: func(ctx context.Context, addr string, tlsCfg *tls.STDConfig, cfg *quic.Config) (quic.EarlyConnection, error) {
+				destinationAddr := M.ParseSocksaddr(addr)
+				conn, dialErr := transportDialer.DialContext(ctx, N.NetworkUDP, destinationAddr)
+				if dialErr != nil {
+					return nil, dialErr
+				}
+				return quic.DialEarly(ctx, bufio.NewUnbindPacketConn(conn), conn.RemoteAddr(), tlsCfg, cfg)
+			},
+			TLSClientConfig: stdConfig,
+		},
+	}, nil
+}
+
+func (t *HTTP3Transport) Reset() {
+	t.transport.Close()
+}
+
+func (t *HTTP3Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	exMessage := *message
+	exMessage.Id = 0
+	exMessage.Compress = true
+	requestBuffer := buf.NewSize(1 + message.Len())
+	rawMessage, err := exMessage.PackBuffer(requestBuffer.FreeBytes())
+	if err != nil {
+		requestBuffer.Release()
+		return nil, err
+	}
+	request, err := http.NewRequestWithContext(ctx, http.MethodPost, t.destination.String(), bytes.NewReader(rawMessage))
+	if err != nil {
+		requestBuffer.Release()
+		return nil, err
+	}
+	request.Header = t.headers.Clone()
+	request.Header.Set("Content-Type", transport.MimeType)
+	request.Header.Set("Accept", transport.MimeType)
+	response, err := t.transport.RoundTrip(request)
+	requestBuffer.Release()
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return nil, E.New("unexpected status: ", response.Status)
+	}
+	var responseMessage mDNS.Msg
+	if response.ContentLength > 0 {
+		responseBuffer := buf.NewSize(int(response.ContentLength))
+		_, err = responseBuffer.ReadFullFrom(response.Body, int(response.ContentLength))
+		if err != nil {
+			return nil, err
+		}
+		err = responseMessage.Unpack(responseBuffer.Bytes())
+		responseBuffer.Release()
+	} else {
+		rawMessage, err = io.ReadAll(response.Body)
+		if err != nil {
+			return nil, err
+		}
+		err = responseMessage.Unpack(rawMessage)
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &responseMessage, nil
+}

dns/transport/quic/quic.go

@@ -0,0 +1,174 @@
+package quic
+
+import (
+	"context"
+	"errors"
+	"sync"
+
+	"github.com/sagernet/quic-go"
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/tls"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/dns/transport"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	sQUIC "github.com/sagernet/sing-quic"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/bufio"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	mDNS "github.com/miekg/dns"
+)
+
+var _ adapter.DNSTransport = (*Transport)(nil)
+
+func RegisterTransport(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.RemoteTLSDNSServerOptions](registry, C.DNSTypeQUIC, NewQUIC)
+}
+
+type Transport struct {
+	dns.TransportAdapter
+	ctx        context.Context
+	logger     logger.ContextLogger
+	dialer     N.Dialer
+	serverAddr M.Socksaddr
+	tlsConfig  tls.Config
+	access     sync.Mutex
+	connection quic.EarlyConnection
+}
+
+func NewQUIC(ctx context.Context, logger log.ContextLogger, tag string, options option.RemoteTLSDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewRemoteDialer(ctx, options.RemoteDNSServerOptions)
+	if err != nil {
+		return nil, err
+	}
+	tlsOptions := common.PtrValueOrDefault(options.TLS)
+	tlsOptions.Enabled = true
+	tlsConfig, err := tls.NewClient(ctx, options.Server, tlsOptions)
+	if err != nil {
+		return nil, err
+	}
+	if len(tlsConfig.NextProtos()) == 0 {
+		tlsConfig.SetNextProtos([]string{"doq"})
+	}
+	serverAddr := options.ServerOptions.Build()
+	if serverAddr.Port == 0 {
+		serverAddr.Port = 853
+	}
+	return &Transport{
+		TransportAdapter: dns.NewTransportAdapterWithRemoteOptions(C.DNSTypeQUIC, tag, options.RemoteDNSServerOptions),
+		ctx:              ctx,
+		logger:           logger,
+		dialer:           transportDialer,
+		serverAddr:       serverAddr,
+		tlsConfig:        tlsConfig,
+	}, nil
+}
+
+func (t *Transport) Reset() {
+	t.access.Lock()
+	defer t.access.Unlock()
+	connection := t.connection
+	if connection != nil {
+		connection.CloseWithError(0, "")
+	}
+}
+
+func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	var (
+		conn     quic.Connection
+		err      error
+		response *mDNS.Msg
+	)
+	for i := 0; i < 2; i++ {
+		conn, err = t.openConnection()
+		if err != nil {
+			return nil, err
+		}
+		response, err = t.exchange(ctx, message, conn)
+		if err == nil {
+			return response, nil
+		} else if !isQUICRetryError(err) {
+			return nil, err
+		} else {
+			conn.CloseWithError(quic.ApplicationErrorCode(0), "")
+			continue
+		}
+	}
+	return nil, err
+}
+
+func (t *Transport) openConnection() (quic.EarlyConnection, error) {
+	connection := t.connection
+	if connection != nil && !common.Done(connection.Context()) {
+		return connection, nil
+	}
+	t.access.Lock()
+	defer t.access.Unlock()
+	connection = t.connection
+	if connection != nil && !common.Done(connection.Context()) {
+		return connection, nil
+	}
+	conn, err := t.dialer.DialContext(t.ctx, N.NetworkUDP, t.serverAddr)
+	if err != nil {
+		return nil, err
+	}
+	earlyConnection, err := sQUIC.DialEarly(
+		t.ctx,
+		bufio.NewUnbindPacketConn(conn),
+		t.serverAddr.UDPAddr(),
+		t.tlsConfig,
+		nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+	t.connection = earlyConnection
+	return earlyConnection, nil
+}
+
+func (t *Transport) exchange(ctx context.Context, message *mDNS.Msg, conn quic.Connection) (*mDNS.Msg, error) {
+	stream, err := conn.OpenStreamSync(ctx)
+	if err != nil {
+		return nil, err
+	}
+	defer stream.Close()
+	defer stream.CancelRead(0)
+	err = transport.WriteMessage(stream, 0, message)
+	if err != nil {
+		return nil, err
+	}
+	return transport.ReadMessage(stream)
+}
+
+// https://github.com/AdguardTeam/dnsproxy/blob/fd1868577652c639cce3da00e12ca548f421baf1/upstream/upstream_quic.go#L394
+func isQUICRetryError(err error) (ok bool) {
+	var qAppErr *quic.ApplicationError
+	if errors.As(err, &qAppErr) && qAppErr.ErrorCode == 0 {
+		return true
+	}
+
+	var qIdleErr *quic.IdleTimeoutError
+	if errors.As(err, &qIdleErr) {
+		return true
+	}
+
+	var resetErr *quic.StatelessResetError
+	if errors.As(err, &resetErr) {
+		return true
+	}
+
+	var qTransportError *quic.TransportError
+	if errors.As(err, &qTransportError) && qTransportError.ErrorCode == quic.NoError {
+		return true
+	}
+
+	if errors.Is(err, quic.Err0RTTRejected) {
+		return true
+	}
+
+	return false
+}

dns/transport/tcp.go

@@ -0,0 +1,99 @@
+package transport
+
+import (
+	"context"
+	"encoding/binary"
+	"io"
+
+	"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"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/buf"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	mDNS "github.com/miekg/dns"
+)
+
+var _ adapter.DNSTransport = (*TCPTransport)(nil)
+
+func RegisterTCP(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.RemoteDNSServerOptions](registry, C.DNSTypeTCP, NewTCP)
+}
+
+type TCPTransport struct {
+	dns.TransportAdapter
+	dialer     N.Dialer
+	serverAddr M.Socksaddr
+}
+
+func NewTCP(ctx context.Context, logger log.ContextLogger, tag string, options option.RemoteDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewRemoteDialer(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+	serverAddr := options.ServerOptions.Build()
+	if serverAddr.Port == 0 {
+		serverAddr.Port = 53
+	}
+	return &TCPTransport{
+		TransportAdapter: dns.NewTransportAdapterWithRemoteOptions(C.DNSTypeTCP, tag, options),
+		dialer:           transportDialer,
+		serverAddr:       serverAddr,
+	}, nil
+}
+
+func (t *TCPTransport) Reset() {
+}
+
+func (t *TCPTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	conn, err := t.dialer.DialContext(ctx, N.NetworkTCP, t.serverAddr)
+	if err != nil {
+		return nil, err
+	}
+	defer conn.Close()
+	err = WriteMessage(conn, 0, message)
+	if err != nil {
+		return nil, err
+	}
+	return ReadMessage(conn)
+}
+
+func ReadMessage(reader io.Reader) (*mDNS.Msg, error) {
+	var responseLen uint16
+	err := binary.Read(reader, binary.BigEndian, &responseLen)
+	if err != nil {
+		return nil, err
+	}
+	if responseLen < 10 {
+		return nil, mDNS.ErrShortRead
+	}
+	buffer := buf.NewSize(int(responseLen))
+	defer buffer.Release()
+	_, err = buffer.ReadFullFrom(reader, int(responseLen))
+	if err != nil {
+		return nil, err
+	}
+	var message mDNS.Msg
+	err = message.Unpack(buffer.Bytes())
+	return &message, err
+}
+
+func WriteMessage(writer io.Writer, messageId uint16, message *mDNS.Msg) error {
+	requestLen := message.Len()
+	buffer := buf.NewSize(3 + requestLen)
+	defer buffer.Release()
+	common.Must(binary.Write(buffer, binary.BigEndian, uint16(requestLen)))
+	exMessage := *message
+	exMessage.Id = messageId
+	exMessage.Compress = true
+	rawMessage, err := exMessage.PackBuffer(buffer.FreeBytes())
+	if err != nil {
+		return err
+	}
+	buffer.Truncate(2 + len(rawMessage))
+	return common.Error(writer.Write(buffer.Bytes()))
+}

dns/transport/tls.go

@@ -0,0 +1,115 @@
+package transport
+
+import (
+	"context"
+	"sync"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/tls"
+	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"
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/x/list"
+
+	mDNS "github.com/miekg/dns"
+)
+
+var _ adapter.DNSTransport = (*TLSTransport)(nil)
+
+func RegisterTLS(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.RemoteTLSDNSServerOptions](registry, C.DNSTypeTLS, NewTLS)
+}
+
+type TLSTransport struct {
+	dns.TransportAdapter
+	logger      logger.ContextLogger
+	dialer      N.Dialer
+	serverAddr  M.Socksaddr
+	tlsConfig   tls.Config
+	access      sync.Mutex
+	connections list.List[*tlsDNSConn]
+}
+
+type tlsDNSConn struct {
+	tls.Conn
+	queryId uint16
+}
+
+func NewTLS(ctx context.Context, logger log.ContextLogger, tag string, options option.RemoteTLSDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewRemoteDialer(ctx, options.RemoteDNSServerOptions)
+	if err != nil {
+		return nil, err
+	}
+	tlsOptions := common.PtrValueOrDefault(options.TLS)
+	tlsOptions.Enabled = true
+	tlsConfig, err := tls.NewClient(ctx, options.Server, tlsOptions)
+	if err != nil {
+		return nil, err
+	}
+	serverAddr := options.ServerOptions.Build()
+	if serverAddr.Port == 0 {
+		serverAddr.Port = 853
+	}
+	return &TLSTransport{
+		TransportAdapter: dns.NewTransportAdapterWithRemoteOptions(C.DNSTypeTLS, tag, options.RemoteDNSServerOptions),
+		logger:           logger,
+		dialer:           transportDialer,
+		serverAddr:       serverAddr,
+		tlsConfig:        tlsConfig,
+	}, nil
+}
+
+func (t *TLSTransport) Reset() {
+	t.access.Lock()
+	defer t.access.Unlock()
+	for connection := t.connections.Front(); connection != nil; connection = connection.Next() {
+		connection.Value.Close()
+	}
+	t.connections.Init()
+}
+
+func (t *TLSTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	t.access.Lock()
+	conn := t.connections.PopFront()
+	t.access.Unlock()
+	if conn != nil {
+		response, err := t.exchange(message, conn)
+		if err == nil {
+			return response, nil
+		}
+	}
+	tcpConn, err := t.dialer.DialContext(ctx, N.NetworkTCP, t.serverAddr)
+	if err != nil {
+		return nil, err
+	}
+	tlsConn, err := tls.ClientHandshake(ctx, tcpConn, t.tlsConfig)
+	if err != nil {
+		tcpConn.Close()
+		return nil, err
+	}
+	return t.exchange(message, &tlsDNSConn{Conn: tlsConn})
+}
+
+func (t *TLSTransport) exchange(message *mDNS.Msg, conn *tlsDNSConn) (*mDNS.Msg, error) {
+	conn.queryId++
+	err := WriteMessage(conn, conn.queryId, message)
+	if err != nil {
+		conn.Close()
+		return nil, E.Cause(err, "write request")
+	}
+	response, err := ReadMessage(conn)
+	if err != nil {
+		conn.Close()
+		return nil, E.Cause(err, "read response")
+	}
+	t.access.Lock()
+	t.connections.PushBack(conn)
+	t.access.Unlock()
+	return response, nil
+}

dns/transport/udp.go

@@ -0,0 +1,223 @@
+package transport
+
+import (
+	"context"
+	"net"
+	"os"
+	"sync"
+
+	"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"
+	"github.com/sagernet/sing/common/buf"
+	"github.com/sagernet/sing/common/logger"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	mDNS "github.com/miekg/dns"
+)
+
+var _ adapter.DNSTransport = (*UDPTransport)(nil)
+
+func RegisterUDP(registry *dns.TransportRegistry) {
+	dns.RegisterTransport[option.RemoteDNSServerOptions](registry, C.DNSTypeUDP, NewUDP)
+}
+
+type UDPTransport struct {
+	dns.TransportAdapter
+	logger       logger.ContextLogger
+	dialer       N.Dialer
+	serverAddr   M.Socksaddr
+	udpSize      int
+	tcpTransport *TCPTransport
+	access       sync.Mutex
+	conn         *dnsConnection
+	done         chan struct{}
+}
+
+func NewUDP(ctx context.Context, logger log.ContextLogger, tag string, options option.RemoteDNSServerOptions) (adapter.DNSTransport, error) {
+	transportDialer, err := dns.NewRemoteDialer(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+	serverAddr := options.ServerOptions.Build()
+	if serverAddr.Port == 0 {
+		serverAddr.Port = 53
+	}
+	return NewUDPRaw(logger, dns.NewTransportAdapterWithRemoteOptions(C.DNSTypeUDP, tag, options), transportDialer, serverAddr), nil
+}
+
+func NewUDPRaw(logger logger.ContextLogger, adapter dns.TransportAdapter, dialer N.Dialer, serverAddr M.Socksaddr) *UDPTransport {
+	return &UDPTransport{
+		TransportAdapter: adapter,
+		logger:           logger,
+		dialer:           dialer,
+		serverAddr:       serverAddr,
+		udpSize:          512,
+		tcpTransport: &TCPTransport{
+			dialer:     dialer,
+			serverAddr: serverAddr,
+		},
+		done: make(chan struct{}),
+	}
+}
+
+func (t *UDPTransport) Reset() {
+	t.access.Lock()
+	defer t.access.Unlock()
+	close(t.done)
+	t.done = make(chan struct{})
+}
+
+func (t *UDPTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	response, err := t.exchange(ctx, message)
+	if err != nil {
+		return nil, err
+	}
+	if response.Truncated {
+		t.logger.InfoContext(ctx, "response truncated, retrying with TCP")
+		return t.tcpTransport.Exchange(ctx, message)
+	}
+	return response, nil
+}
+
+func (t *UDPTransport) exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
+	conn, err := t.open(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if edns0Opt := message.IsEdns0(); edns0Opt != nil {
+		if udpSize := int(edns0Opt.UDPSize()); udpSize > t.udpSize {
+			t.udpSize = udpSize
+		}
+	}
+	buffer := buf.NewSize(1 + message.Len())
+	defer buffer.Release()
+	exMessage := *message
+	exMessage.Compress = true
+	messageId := message.Id
+	callback := &dnsCallback{
+		done: make(chan struct{}),
+	}
+	conn.access.Lock()
+	conn.queryId++
+	exMessage.Id = conn.queryId
+	conn.callbacks[exMessage.Id] = callback
+	conn.access.Unlock()
+	defer func() {
+		conn.access.Lock()
+		delete(conn.callbacks, messageId)
+		conn.access.Unlock()
+		callback.access.Lock()
+		select {
+		case <-callback.done:
+		default:
+			close(callback.done)
+		}
+		callback.access.Unlock()
+	}()
+	rawMessage, err := exMessage.PackBuffer(buffer.FreeBytes())
+	if err != nil {
+		return nil, err
+	}
+	_, err = conn.Write(rawMessage)
+	if err != nil {
+		conn.Close(err)
+		return nil, err
+	}
+	select {
+	case <-callback.done:
+		callback.message.Id = messageId
+		return callback.message, nil
+	case <-conn.done:
+		return nil, conn.err
+	case <-t.done:
+		return nil, os.ErrClosed
+	case <-ctx.Done():
+		conn.Close(ctx.Err())
+		return nil, ctx.Err()
+	}
+}
+
+func (t *UDPTransport) open(ctx context.Context) (*dnsConnection, error) {
+	t.access.Lock()
+	defer t.access.Unlock()
+	if t.conn != nil {
+		select {
+		case <-t.conn.done:
+		default:
+			return t.conn, nil
+		}
+	}
+	conn, err := t.dialer.DialContext(ctx, N.NetworkUDP, t.serverAddr)
+	if err != nil {
+		return nil, err
+	}
+	dnsConn := &dnsConnection{
+		Conn:      conn,
+		done:      make(chan struct{}),
+		callbacks: make(map[uint16]*dnsCallback),
+	}
+	go t.recvLoop(dnsConn)
+	t.conn = dnsConn
+	return dnsConn, nil
+}
+
+func (t *UDPTransport) recvLoop(conn *dnsConnection) {
+	for {
+		buffer := buf.NewSize(t.udpSize)
+		_, err := buffer.ReadOnceFrom(conn)
+		if err != nil {
+			buffer.Release()
+			conn.Close(err)
+			return
+		}
+		var message mDNS.Msg
+		err = message.Unpack(buffer.Bytes())
+		buffer.Release()
+		if err != nil {
+			conn.Close(err)
+			return
+		}
+		conn.access.RLock()
+		callback, loaded := conn.callbacks[message.Id]
+		conn.access.RUnlock()
+		if !loaded {
+			continue
+		}
+		callback.access.Lock()
+		select {
+		case <-callback.done:
+		default:
+			callback.message = &message
+			close(callback.done)
+		}
+		callback.access.Unlock()
+	}
+}
+
+type dnsConnection struct {
+	net.Conn
+	access    sync.RWMutex
+	done      chan struct{}
+	closeOnce sync.Once
+	err       error
+	queryId   uint16
+	callbacks map[uint16]*dnsCallback
+}
+
+func (c *dnsConnection) Close(err error) {
+	c.closeOnce.Do(func() {
+		close(c.done)
+		c.err = err
+	})
+	c.Conn.Close()
+}
+
+type dnsCallback struct {
+	access  sync.Mutex
+	message *mDNS.Msg
+	done    chan struct{}
+}

dns/transport_adapter.go

@@ -0,0 +1,78 @@
+package dns
+
+import (
+	"net/netip"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+)
+
+var _ adapter.LegacyDNSTransport = (*TransportAdapter)(nil)
+
+type TransportAdapter struct {
+	transportType string
+	transportTag  string
+	dependencies  []string
+	strategy      C.DomainStrategy
+	clientSubnet  netip.Prefix
+}
+
+func NewTransportAdapter(transportType string, transportTag string, dependencies []string) TransportAdapter {
+	return TransportAdapter{
+		transportType: transportType,
+		transportTag:  transportTag,
+		dependencies:  dependencies,
+	}
+}
+
+func NewTransportAdapterWithLocalOptions(transportType string, transportTag string, localOptions option.LocalDNSServerOptions) TransportAdapter {
+	var dependencies []string
+	if localOptions.DomainResolver != nil && localOptions.DomainResolver.Server != "" {
+		dependencies = append(dependencies, localOptions.DomainResolver.Server)
+	}
+	return TransportAdapter{
+		transportType: transportType,
+		transportTag:  transportTag,
+		dependencies:  dependencies,
+		strategy:      C.DomainStrategy(localOptions.LegacyStrategy),
+		clientSubnet:  localOptions.LegacyClientSubnet,
+	}
+}
+
+func NewTransportAdapterWithRemoteOptions(transportType string, transportTag string, remoteOptions option.RemoteDNSServerOptions) TransportAdapter {
+	var dependencies []string
+	if remoteOptions.DomainResolver != nil && remoteOptions.DomainResolver.Server != "" {
+		dependencies = append(dependencies, remoteOptions.DomainResolver.Server)
+	}
+	if remoteOptions.LegacyAddressResolver != "" {
+		dependencies = append(dependencies, remoteOptions.LegacyAddressResolver)
+	}
+	return TransportAdapter{
+		transportType: transportType,
+		transportTag:  transportTag,
+		dependencies:  dependencies,
+		strategy:      C.DomainStrategy(remoteOptions.LegacyStrategy),
+		clientSubnet:  remoteOptions.LegacyClientSubnet,
+	}
+}
+
+func (a *TransportAdapter) Type() string {
+	return a.transportType
+}
+
+func (a *TransportAdapter) Tag() string {
+	return a.transportTag
+}
+
+func (a *TransportAdapter) Dependencies() []string {
+	return a.dependencies
+}
+
+func (a *TransportAdapter) LegacyStrategy() C.DomainStrategy {
+	return a.strategy
+}
+
+func (a *TransportAdapter) LegacyClientSubnet() netip.Prefix {
+	return a.clientSubnet
+}

dns/transport_dialer.go

@@ -0,0 +1,103 @@
+package dns
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/dialer"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/service"
+)
+
+func NewLocalDialer(ctx context.Context, options option.LocalDNSServerOptions) (N.Dialer, error) {
+	if options.LegacyDefaultDialer {
+		return dialer.NewDefaultOutbound(ctx), nil
+	} else {
+		return dialer.NewWithOptions(dialer.Options{
+			Context:        ctx,
+			Options:        options.DialerOptions,
+			DirectResolver: true,
+		})
+	}
+}
+
+func NewRemoteDialer(ctx context.Context, options option.RemoteDNSServerOptions) (N.Dialer, error) {
+	if options.LegacyDefaultDialer {
+		transportDialer := dialer.NewDefaultOutbound(ctx)
+		if options.LegacyAddressResolver != "" {
+			transport := service.FromContext[adapter.DNSTransportManager](ctx)
+			resolverTransport, loaded := transport.Transport(options.LegacyAddressResolver)
+			if !loaded {
+				return nil, E.New("address resolver not found: ", options.LegacyAddressResolver)
+			}
+			transportDialer = newTransportDialer(transportDialer, service.FromContext[adapter.DNSRouter](ctx), resolverTransport, C.DomainStrategy(options.LegacyAddressStrategy), time.Duration(options.LegacyAddressFallbackDelay))
+		} else if options.ServerIsDomain() {
+			return nil, E.New("missing address resolver for server: ", options.Server)
+		}
+		return transportDialer, nil
+	} else {
+		return dialer.NewWithOptions(dialer.Options{
+			Context:        ctx,
+			Options:        options.DialerOptions,
+			RemoteIsDomain: options.ServerIsDomain(),
+			DirectResolver: true,
+		})
+	}
+}
+
+type legacyTransportDialer struct {
+	dialer        N.Dialer
+	dnsRouter     adapter.DNSRouter
+	transport     adapter.DNSTransport
+	strategy      C.DomainStrategy
+	fallbackDelay time.Duration
+}
+
+func newTransportDialer(dialer N.Dialer, dnsRouter adapter.DNSRouter, transport adapter.DNSTransport, strategy C.DomainStrategy, fallbackDelay time.Duration) *legacyTransportDialer {
+	return &legacyTransportDialer{
+		dialer,
+		dnsRouter,
+		transport,
+		strategy,
+		fallbackDelay,
+	}
+}
+
+func (d *legacyTransportDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	if destination.IsIP() {
+		return d.dialer.DialContext(ctx, network, destination)
+	}
+	addresses, err := d.dnsRouter.Lookup(ctx, destination.Fqdn, adapter.DNSQueryOptions{
+		Transport: d.transport,
+		Strategy:  d.strategy,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return N.DialParallel(ctx, d.dialer, network, destination, addresses, d.strategy == C.DomainStrategyPreferIPv6, d.fallbackDelay)
+}
+
+func (d *legacyTransportDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	if destination.IsIP() {
+		return d.dialer.ListenPacket(ctx, destination)
+	}
+	addresses, err := d.dnsRouter.Lookup(ctx, destination.Fqdn, adapter.DNSQueryOptions{
+		Transport: d.transport,
+		Strategy:  d.strategy,
+	})
+	if err != nil {
+		return nil, err
+	}
+	conn, _, err := N.ListenSerial(ctx, d.dialer, destination, addresses)
+	return conn, err
+}
+
+func (d *legacyTransportDialer) Upstream() any {
+	return d.dialer
+}

dns/transport_manager.go

@@ -0,0 +1,288 @@
+package dns
+
+import (
+	"context"
+	"io"
+	"os"
+	"strings"
+	"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.DNSTransportManager = (*TransportManager)(nil)
+
+type TransportManager struct {
+	logger                   log.ContextLogger
+	registry                 adapter.DNSTransportRegistry
+	outbound                 adapter.OutboundManager
+	defaultTag               string
+	access                   sync.RWMutex
+	started                  bool
+	stage                    adapter.StartStage
+	transports               []adapter.DNSTransport
+	transportByTag           map[string]adapter.DNSTransport
+	dependByTag              map[string][]string
+	defaultTransport         adapter.DNSTransport
+	defaultTransportFallback adapter.DNSTransport
+	fakeIPTransport          adapter.FakeIPTransport
+}
+
+func NewTransportManager(logger logger.ContextLogger, registry adapter.DNSTransportRegistry, outbound adapter.OutboundManager, defaultTag string) *TransportManager {
+	return &TransportManager{
+		logger:         logger,
+		registry:       registry,
+		outbound:       outbound,
+		defaultTag:     defaultTag,
+		transportByTag: make(map[string]adapter.DNSTransport),
+		dependByTag:    make(map[string][]string),
+	}
+}
+
+func (m *TransportManager) Initialize(defaultTransportFallback adapter.DNSTransport) {
+	m.defaultTransportFallback = defaultTransportFallback
+}
+
+func (m *TransportManager) Start(stage adapter.StartStage) error {
+	m.access.Lock()
+	if m.started && m.stage >= stage {
+		panic("already started")
+	}
+	m.started = true
+	m.stage = stage
+	outbounds := m.transports
+	m.access.Unlock()
+	if stage == adapter.StartStateStart {
+		return m.startTransports(m.transports)
+	} else {
+		for _, outbound := range outbounds {
+			err := adapter.LegacyStart(outbound, stage)
+			if err != nil {
+				return E.Cause(err, stage, " dns/", outbound.Type(), "[", outbound.Tag(), "]")
+			}
+		}
+	}
+	return nil
+}
+
+func (m *TransportManager) startTransports(transports []adapter.DNSTransport) error {
+	monitor := taskmonitor.New(m.logger, C.StartTimeout)
+	started := make(map[string]bool)
+	for {
+		canContinue := false
+	startOne:
+		for _, transportToStart := range transports {
+			transportTag := transportToStart.Tag()
+			if started[transportTag] {
+				continue
+			}
+			dependencies := transportToStart.Dependencies()
+			for _, dependency := range dependencies {
+				if !started[dependency] {
+					continue startOne
+				}
+			}
+			started[transportTag] = true
+			canContinue = true
+			if starter, isStarter := transportToStart.(adapter.Lifecycle); isStarter {
+				monitor.Start("start dns/", transportToStart.Type(), "[", transportTag, "]")
+				err := starter.Start(adapter.StartStateStart)
+				monitor.Finish()
+				if err != nil {
+					return E.Cause(err, "start dns/", transportToStart.Type(), "[", transportTag, "]")
+				}
+			}
+		}
+		if len(started) == len(transports) {
+			break
+		}
+		if canContinue {
+			continue
+		}
+		currentTransport := common.Find(transports, func(it adapter.DNSTransport) bool {
+			return !started[it.Tag()]
+		})
+		var lintTransport func(oTree []string, oCurrent adapter.DNSTransport) error
+		lintTransport = func(oTree []string, oCurrent adapter.DNSTransport) error {
+			problemTransportTag := common.Find(oCurrent.Dependencies(), func(it string) bool {
+				return !started[it]
+			})
+			if common.Contains(oTree, problemTransportTag) {
+				return E.New("circular server dependency: ", strings.Join(oTree, " -> "), " -> ", problemTransportTag)
+			}
+			m.access.Lock()
+			problemTransport := m.transportByTag[problemTransportTag]
+			m.access.Unlock()
+			if problemTransport == nil {
+				return E.New("dependency[", problemTransportTag, "] not found for server[", oCurrent.Tag(), "]")
+			}
+			return lintTransport(append(oTree, problemTransportTag), problemTransport)
+		}
+		return lintTransport([]string{currentTransport.Tag()}, currentTransport)
+	}
+	return nil
+}
+
+func (m *TransportManager) Close() error {
+	monitor := taskmonitor.New(m.logger, C.StopTimeout)
+	m.access.Lock()
+	if !m.started {
+		m.access.Unlock()
+		return nil
+	}
+	m.started = false
+	transports := m.transports
+	m.transports = nil
+	m.access.Unlock()
+	var err error
+	for _, transport := range transports {
+		if closer, isCloser := transport.(io.Closer); isCloser {
+			monitor.Start("close server/", transport.Type(), "[", transport.Tag(), "]")
+			err = E.Append(err, closer.Close(), func(err error) error {
+				return E.Cause(err, "close server/", transport.Type(), "[", transport.Tag(), "]")
+			})
+			monitor.Finish()
+		}
+	}
+	return nil
+}
+
+func (m *TransportManager) Transports() []adapter.DNSTransport {
+	m.access.RLock()
+	defer m.access.RUnlock()
+	return m.transports
+}
+
+func (m *TransportManager) Transport(tag string) (adapter.DNSTransport, bool) {
+	m.access.RLock()
+	outbound, found := m.transportByTag[tag]
+	m.access.RUnlock()
+	return outbound, found
+}
+
+func (m *TransportManager) Default() adapter.DNSTransport {
+	m.access.RLock()
+	defer m.access.RUnlock()
+	if m.defaultTransport != nil {
+		return m.defaultTransport
+	} else {
+		return m.defaultTransportFallback
+	}
+}
+
+func (m *TransportManager) FakeIP() adapter.FakeIPTransport {
+	m.access.RLock()
+	defer m.access.RUnlock()
+	return m.fakeIPTransport
+}
+
+func (m *TransportManager) Remove(tag string) error {
+	m.access.Lock()
+	defer m.access.Unlock()
+	transport, found := m.transportByTag[tag]
+	if !found {
+		return os.ErrInvalid
+	}
+	delete(m.transportByTag, tag)
+	index := common.Index(m.transports, func(it adapter.DNSTransport) bool {
+		return it == transport
+	})
+	if index == -1 {
+		panic("invalid inbound index")
+	}
+	m.transports = append(m.transports[:index], m.transports[index+1:]...)
+	started := m.started
+	if m.defaultTransport == transport {
+		if len(m.transports) > 0 {
+			nextTransport := m.transports[0]
+			if nextTransport.Type() != C.DNSTypeFakeIP {
+				return E.New("default server cannot be fakeip")
+			}
+			m.defaultTransport = nextTransport
+			m.logger.Info("updated default server to ", m.defaultTransport.Tag())
+		} else {
+			m.defaultTransport = nil
+		}
+	}
+	dependBy := m.dependByTag[tag]
+	if len(dependBy) > 0 {
+		return E.New("server[", tag, "] is depended by ", strings.Join(dependBy, ", "))
+	}
+	dependencies := transport.Dependencies()
+	for _, dependency := range dependencies {
+		if len(m.dependByTag[dependency]) == 1 {
+			delete(m.dependByTag, dependency)
+		} else {
+			m.dependByTag[dependency] = common.Filter(m.dependByTag[dependency], func(it string) bool {
+				return it != tag
+			})
+		}
+	}
+	if started {
+		transport.Reset()
+	}
+	return nil
+}
+
+func (m *TransportManager) Create(ctx context.Context, logger log.ContextLogger, tag string, transportType string, options any) error {
+	if tag == "" {
+		return os.ErrInvalid
+	}
+	transport, err := m.registry.CreateDNSTransport(ctx, logger, tag, transportType, options)
+	if err != nil {
+		return err
+	}
+	m.access.Lock()
+	defer m.access.Unlock()
+	if m.started {
+		for _, stage := range adapter.ListStartStages {
+			err = adapter.LegacyStart(transport, stage)
+			if err != nil {
+				return E.Cause(err, stage, " dns/", transport.Type(), "[", transport.Tag(), "]")
+			}
+		}
+	}
+	if existsTransport, loaded := m.transportByTag[tag]; loaded {
+		if m.started {
+			err = common.Close(existsTransport)
+			if err != nil {
+				return E.Cause(err, "close dns/", existsTransport.Type(), "[", existsTransport.Tag(), "]")
+			}
+		}
+		existsIndex := common.Index(m.transports, func(it adapter.DNSTransport) bool {
+			return it == existsTransport
+		})
+		if existsIndex == -1 {
+			panic("invalid inbound index")
+		}
+		m.transports = append(m.transports[:existsIndex], m.transports[existsIndex+1:]...)
+	}
+	m.transports = append(m.transports, transport)
+	m.transportByTag[tag] = transport
+	dependencies := transport.Dependencies()
+	for _, dependency := range dependencies {
+		m.dependByTag[dependency] = append(m.dependByTag[dependency], tag)
+	}
+	if tag == m.defaultTag || (m.defaultTag == "" && m.defaultTransport == nil) {
+		if transport.Type() == C.DNSTypeFakeIP {
+			return E.New("default server cannot be fakeip")
+		}
+		m.defaultTransport = transport
+		if m.started {
+			m.logger.Info("updated default server to ", transport.Tag())
+		}
+	}
+	if transport.Type() == C.DNSTypeFakeIP {
+		if m.fakeIPTransport != nil {
+			return E.New("multiple fakeip server are not supported")
+		}
+		m.fakeIPTransport = transport.(adapter.FakeIPTransport)
+	}
+	return nil
+}

dns/transport_registry.go

@@ -0,0 +1,72 @@
+package dns
+
+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 TransportConstructorFunc[T any] func(ctx context.Context, logger log.ContextLogger, tag string, options T) (adapter.DNSTransport, error)
+
+func RegisterTransport[Options any](registry *TransportRegistry, transportType string, constructor TransportConstructorFunc[Options]) {
+	registry.register(transportType, func() any {
+		return new(Options)
+	}, func(ctx context.Context, logger log.ContextLogger, tag string, rawOptions any) (adapter.DNSTransport, error) {
+		var options *Options
+		if rawOptions != nil {
+			options = rawOptions.(*Options)
+		}
+		return constructor(ctx, logger, tag, common.PtrValueOrDefault(options))
+	})
+}
+
+var _ adapter.DNSTransportRegistry = (*TransportRegistry)(nil)
+
+type (
+	optionsConstructorFunc func() any
+	constructorFunc        func(ctx context.Context, logger log.ContextLogger, tag string, options any) (adapter.DNSTransport, error)
+)
+
+type TransportRegistry struct {
+	access       sync.Mutex
+	optionsType  map[string]optionsConstructorFunc
+	constructors map[string]constructorFunc
+}
+
+func NewTransportRegistry() *TransportRegistry {
+	return &TransportRegistry{
+		optionsType:  make(map[string]optionsConstructorFunc),
+		constructors: make(map[string]constructorFunc),
+	}
+}
+
+func (r *TransportRegistry) CreateOptions(transportType string) (any, bool) {
+	r.access.Lock()
+	defer r.access.Unlock()
+	optionsConstructor, loaded := r.optionsType[transportType]
+	if !loaded {
+		return nil, false
+	}
+	return optionsConstructor(), true
+}
+
+func (r *TransportRegistry) CreateDNSTransport(ctx context.Context, logger log.ContextLogger, tag string, transportType string, options any) (adapter.DNSTransport, error) {
+	r.access.Lock()
+	defer r.access.Unlock()
+	constructor, loaded := r.constructors[transportType]
+	if !loaded {
+		return nil, E.New("transport type not found: " + transportType)
+	}
+	return constructor(ctx, logger, tag, options)
+}
+
+func (r *TransportRegistry) register(transportType string, optionsConstructor optionsConstructorFunc, constructor constructorFunc) {
+	r.access.Lock()
+	defer r.access.Unlock()
+	r.optionsType[transportType] = optionsConstructor
+	r.constructors[transportType] = constructor
+}

docs/changelog.md

@@ -2,6 +2,190 @@
 icon: material/alert-decagram
 ---
 
+#### 1.12.0-alpha.3
+
+* Fixes and improvements
+
+### 1.11.1
+
+* Fixes and improvements
+
+#### 1.12.0-alpha.2
+
+* Update quic-go to v0.49.0
+* Fixes and improvements
+
+#### 1.12.0-alpha.1
+
+* Refactor DNS servers **1**
+* Add domain resolver options**2**
+* Add TLS fragment route options **3**
+* Add certificate options **4**
+
+**1**:
+
+DNS servers are refactored for better performance and scalability.
+
+See [DNS server](/configuration/dns/server/).
+
+For migration, see [Migrate to new DNS server formats](/migration/#migrate-to-new-dns-servers).
+
+Compatibility for old formats will be removed in sing-box 1.14.0.
+
+**2**:
+
+Legacy `outbound` DNS rules are deprecated
+and can be replaced by the new `domain_resolver` option.
+
+See [Dial Fields](/configuration/shared/dial/#domain_resolver) and 
+[Route](/configuration/route/#default_domain_resolver).
+
+For migration, see [Migrate outbound DNS rule items to domain resolver](/migration/#migrate-outbound-dns-rule-items-to-domain-resolver).
+
+**3**:
+
+The new TLS fragment route options allow you to fragment TLS handshakes to bypass firewalls.
+
+This feature is intended to circumvent simple firewalls based on **plaintext packet matching**, and should not be used to circumvent real censorship.
+
+Since it is not designed for performance, it should not be applied to all connections, but only to server names that are known to be blocked.
+
+See [Route Action](/configuration/route/rule_action/#tls_fragment).
+
+**4**:
+
+New certificate options allow you to manage the default list of trusted X509 CA certificates.
+
+For the system certificate list, fixed Go not reading Android trusted certificates correctly.
+
+You can also use the Mozilla Included List instead, or add trusted certificates yourself.
+
+See [Certificate](/configuration/certificate/).
+
+### 1.11.0
+
+Important changes since 1.10:
+
+* Introducing rule actions **1**
+* Improve tun compatibility **3**
+* Merge route options to route actions **4**
+* Add `network_type`, `network_is_expensive` and `network_is_constrainted` rule items **5**
+* Add multi network dialing **6**
+* Add `cache_capacity` DNS option **7**
+* Add `override_address` and `override_port` route options **8**
+* Upgrade WireGuard outbound to endpoint **9**
+* Add UDP GSO support for WireGuard
+* Make GSO adaptive **10**
+* Add UDP timeout route option **11**
+* Add more masquerade options for hysteria2 **12**
+* Add `rule-set merge` command
+* Add port hopping support for Hysteria2 **13**
+* Hysteria2 `ignore_client_bandwidth` behavior update **14**
+
+**1**:
+
+New rule actions replace legacy inbound fields and special outbound fields,
+and can be used for pre-matching **2**.
+
+See [Rule](/configuration/route/rule/),
+[Rule Action](/configuration/route/rule_action/),
+[DNS Rule](/configuration/dns/rule/) and
+[DNS Rule Action](/configuration/dns/rule_action/).
+
+For migration, see
+[Migrate legacy special outbounds to rule actions](/migration/#migrate-legacy-special-outbounds-to-rule-actions),
+[Migrate legacy inbound fields to rule actions](/migration/#migrate-legacy-inbound-fields-to-rule-actions)
+and [Migrate legacy DNS route options to rule actions](/migration/#migrate-legacy-dns-route-options-to-rule-actions).
+
+**2**:
+
+Similar to Surge's pre-matching.
+
+Specifically, new rule actions allow you to reject connections with
+TCP RST (for TCP connections) and ICMP port unreachable (for UDP packets)
+before connection established to improve tun's compatibility.
+
+See [Rule Action](/configuration/route/rule_action/).
+
+**3**:
+
+When `gvisor` tun stack is enabled, even if the request passes routing,
+if the outbound connection establishment fails,
+the connection still does not need to be established and a TCP RST is replied.
+
+**4**:
+
+Route options in DNS route actions will no longer be considered deprecated,
+see [DNS Route Action](/configuration/dns/rule_action/).
+
+Also, now `udp_disable_domain_unmapping` and `udp_connect` can also be configured in route action,
+see [Route Action](/configuration/route/rule_action/).
+
+**5**:
+
+When using in graphical clients, new routing rule items allow you to match on
+network type (WIFI, cellular, etc.), whether the network is expensive, and whether Low Data Mode is enabled.
+
+See [Route Rule](/configuration/route/rule/), [DNS Route Rule](/configuration/dns/rule/)
+and [Headless Rule](/configuration/rule-set/headless-rule/).
+
+**6**:
+
+Similar to Surge's strategy.
+
+New options allow you to connect using multiple network interfaces,
+prefer or only use one type of interface,
+and configure a timeout to fallback to other interfaces.
+
+See [Dial Fields](/configuration/shared/dial/#network_strategy),
+[Rule Action](/configuration/route/rule_action/#network_strategy)
+and [Route](/configuration/route/#default_network_strategy).
+
+**7**:
+
+See [DNS](/configuration/dns/#cache_capacity).
+
+**8**:
+
+See [Rule Action](/configuration/route/#override_address) and
+[Migrate destination override fields to route options](/migration/#migrate-destination-override-fields-to-route-options).
+
+**9**:
+
+The new WireGuard endpoint combines inbound and outbound capabilities,
+and the old outbound will be removed in sing-box 1.13.0.
+
+See [Endpoint](/configuration/endpoint/), [WireGuard Endpoint](/configuration/endpoint/wireguard/)
+and [Migrate WireGuard outbound fields to route options](/migration/#migrate-wireguard-outbound-to-endpoint).
+
+**10**:
+
+For WireGuard outbound and endpoint, GSO will be automatically enabled when available,
+see [WireGuard Outbound](/configuration/outbound/wireguard/#gso).
+
+For TUN, GSO has been removed,
+see [Deprecated](/deprecated/#gso-option-in-tun).
+
+**11**:
+
+See [Rule Action](/configuration/route/rule_action/#udp_timeout).
+
+**12**:
+
+See [Hysteria2](/configuration/inbound/hysteria2/#masquerade).
+
+**13**:
+
+See [Hysteria2](/configuration/outbound/hysteria2/).
+
+**14**:
+
+When `up_mbps` and `down_mbps` are set, `ignore_client_bandwidth` instead denies clients from using BBR CC.
+
+### 1.10.7
+
+* Fixes and improvements
+
 #### 1.11.0-beta.20
 
 * Hysteria2 `ignore_client_bandwidth` behavior update **1**

docs/configuration/certificate/index.md

@@ -0,0 +1,54 @@
+---
+icon: material/new-box
+---
+
+!!! question "Since sing-box 1.12.0"
+
+# Certificate
+
+### Structure
+
+```json
+{
+  "store": "",
+  "certificate": [],
+  "certificate_path": [],
+  "certificate_directory_path": []
+}
+```
+
+!!! note ""
+
+    You can ignore the JSON Array [] tag when the content is only one item
+
+### Fields
+
+#### store
+
+The default X509 trusted CA certificate list.
+
+| Type               | Description                                                                                                   |
+|--------------------|---------------------------------------------------------------------------------------------------------------|
+| `system` (default) | System trusted CA certificates                                                                                |
+| `mozilla`          | [Mozilla Included List](https://wiki.mozilla.org/CA/Included_Certificates) with China CA certificates removed |
+| `none`             | Empty list                                                                                                    |
+
+#### certificate
+
+The certificate line array to trust, in PEM format.
+
+#### certificate_path
+
+!!! note ""
+
+    Will be automatically reloaded if file modified.
+
+The paths to certificates to trust, in PEM format.
+
+#### certificate_directory_path
+
+!!! note ""
+
+    Will be automatically reloaded if file modified.
+
+The directory path to search for certificates to trust,in PEM format.

docs/configuration/dns/fakeip.md

@@ -1,3 +1,11 @@
+---
+icon: material/delete-clock
+---
+
+!!! failure "Deprecated in sing-box 1.12.0"
+
+    Legacy fake-ip configuration is deprecated and will be removed in sing-box 1.14.0, check [Migration](/migration/#migrate-to-new-dns-servers).
+
 ### Structure
 
 ```json

docs/configuration/dns/fakeip.zh.md

@@ -1,3 +1,11 @@
+---
+icon: material/delete-clock
+---
+
+!!! failure "已在 sing-box 1.12.0 废弃"
+
+    旧的 fake-ip 配置已废弃且将在 sing-box 1.14.0 中被移除，参阅 [迁移指南](/migration/#migrate-to-new-dns-servers)。
+
 ### 结构
 
 ```json

docs/configuration/dns/index.md

@@ -49,8 +49,6 @@ Default domain strategy for resolving the domain names.
 
 One of `prefer_ipv4` `prefer_ipv6` `ipv4_only` `ipv6_only`.
 
-Take no effect if `server.strategy` is set.
-
 #### disable_cache
 
 Disable dns cache.