Add WithDisableRetry

Co-authored-by: DarthVader <61409963+darsvador@users.noreply.github.com>

README.md

@@ -40,7 +40,6 @@
   - [luci-app-xray](https://github.com/yichya/luci-app-xray) ([openwrt-xray](https://github.com/yichya/openwrt-xray))
 - Windows
   - [v2rayN](https://github.com/2dust/v2rayN)
-  - [Qv2ray](https://github.com/Qv2ray/Qv2ray)
   - [Netch (NetFilter & TUN/TAP)](https://github.com/NetchX/Netch)
 - Android
   - [v2rayNG](https://github.com/2dust/v2rayNG)

app/dispatcher/default.go

@@ -179,7 +179,7 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 func shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
 	domain := result.Domain()
 	for _, d := range request.ExcludeForDomain {
-		if domain == d {
+		if strings.ToLower(domain) == d {
 			return false
 		}
 	}
@@ -309,10 +309,15 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (Sni
 func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {
 	var handler outbound.Handler
 
+	skipRoutePick := false
+	if content := session.ContentFromContext(ctx); content != nil {
+		skipRoutePick = content.SkipRoutePick
+	}
+
 	routingLink := routing_session.AsRoutingContext(ctx)
 	inTag := routingLink.GetInboundTag()
 	isPickRoute := false
-	if d.router != nil {
+	if d.router != nil && !skipRoutePick {
 		if route, err := d.router.PickRoute(routingLink); err == nil {
 			outTag := route.GetOutboundTag()
 			isPickRoute = true

app/dns/config.go

@@ -1,63 +0,0 @@
-package dns
-
-import (
-	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/strmatcher"
-	"github.com/xtls/xray-core/common/uuid"
-)
-
-var typeMap = map[DomainMatchingType]strmatcher.Type{
-	DomainMatchingType_Full:      strmatcher.Full,
-	DomainMatchingType_Subdomain: strmatcher.Domain,
-	DomainMatchingType_Keyword:   strmatcher.Substr,
-	DomainMatchingType_Regex:     strmatcher.Regex,
-}
-
-// References:
-// https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
-// https://unix.stackexchange.com/questions/92441/whats-the-difference-between-local-home-and-lan
-var localTLDsAndDotlessDomains = []*NameServer_PriorityDomain{
-	{Type: DomainMatchingType_Regex, Domain: "^[^.]+$"}, // This will only match domains without any dot
-	{Type: DomainMatchingType_Subdomain, Domain: "local"},
-	{Type: DomainMatchingType_Subdomain, Domain: "localdomain"},
-	{Type: DomainMatchingType_Subdomain, Domain: "localhost"},
-	{Type: DomainMatchingType_Subdomain, Domain: "lan"},
-	{Type: DomainMatchingType_Subdomain, Domain: "home.arpa"},
-	{Type: DomainMatchingType_Subdomain, Domain: "example"},
-	{Type: DomainMatchingType_Subdomain, Domain: "invalid"},
-	{Type: DomainMatchingType_Subdomain, Domain: "test"},
-}
-
-var localTLDsAndDotlessDomainsRule = &NameServer_OriginalRule{
-	Rule: "geosite:private",
-	Size: uint32(len(localTLDsAndDotlessDomains)),
-}
-
-func toStrMatcher(t DomainMatchingType, domain string) (strmatcher.Matcher, error) {
-	strMType, f := typeMap[t]
-	if !f {
-		return nil, newError("unknown mapping type", t).AtWarning()
-	}
-	matcher, err := strMType.New(domain)
-	if err != nil {
-		return nil, newError("failed to create str matcher").Base(err)
-	}
-	return matcher, nil
-}
-
-func toNetIP(addrs []net.Address) ([]net.IP, error) {
-	ips := make([]net.IP, 0, len(addrs))
-	for _, addr := range addrs {
-		if addr.Family().IsIP() {
-			ips = append(ips, addr.IP())
-		} else {
-			return nil, newError("Failed to convert address", addr, "to Net IP.").AtWarning()
-		}
-	}
-	return ips, nil
-}
-
-func generateRandomTag() string {
-	id := uuid.New()
-	return "xray.system." + id.String()
-}

app/dns/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.15.8
+// 	protoc        v3.14.0
 // source: app/dns/config.proto
 
 package dns
@@ -79,112 +79,12 @@ func (DomainMatchingType) EnumDescriptor() ([]byte, []int) {
 	return file_app_dns_config_proto_rawDescGZIP(), []int{0}
 }
 
-type QueryStrategy int32
-
-const (
-	QueryStrategy_USE_IP  QueryStrategy = 0
-	QueryStrategy_USE_IP4 QueryStrategy = 1
-	QueryStrategy_USE_IP6 QueryStrategy = 2
-)
-
-// Enum value maps for QueryStrategy.
-var (
-	QueryStrategy_name = map[int32]string{
-		0: "USE_IP",
-		1: "USE_IP4",
-		2: "USE_IP6",
-	}
-	QueryStrategy_value = map[string]int32{
-		"USE_IP":  0,
-		"USE_IP4": 1,
-		"USE_IP6": 2,
-	}
-)
-
-func (x QueryStrategy) Enum() *QueryStrategy {
-	p := new(QueryStrategy)
-	*p = x
-	return p
-}
-
-func (x QueryStrategy) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (QueryStrategy) Descriptor() protoreflect.EnumDescriptor {
-	return file_app_dns_config_proto_enumTypes[1].Descriptor()
-}
-
-func (QueryStrategy) Type() protoreflect.EnumType {
-	return &file_app_dns_config_proto_enumTypes[1]
-}
-
-func (x QueryStrategy) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use QueryStrategy.Descriptor instead.
-func (QueryStrategy) EnumDescriptor() ([]byte, []int) {
-	return file_app_dns_config_proto_rawDescGZIP(), []int{1}
-}
-
-type CacheStrategy int32
-
-const (
-	CacheStrategy_Cache_ALL     CacheStrategy = 0
-	CacheStrategy_Cache_NOERROR CacheStrategy = 1
-	CacheStrategy_Cache_DISABLE CacheStrategy = 2
-)
-
-// Enum value maps for CacheStrategy.
-var (
-	CacheStrategy_name = map[int32]string{
-		0: "Cache_ALL",
-		1: "Cache_NOERROR",
-		2: "Cache_DISABLE",
-	}
-	CacheStrategy_value = map[string]int32{
-		"Cache_ALL":     0,
-		"Cache_NOERROR": 1,
-		"Cache_DISABLE": 2,
-	}
-)
-
-func (x CacheStrategy) Enum() *CacheStrategy {
-	p := new(CacheStrategy)
-	*p = x
-	return p
-}
-
-func (x CacheStrategy) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (CacheStrategy) Descriptor() protoreflect.EnumDescriptor {
-	return file_app_dns_config_proto_enumTypes[2].Descriptor()
-}
-
-func (CacheStrategy) Type() protoreflect.EnumType {
-	return &file_app_dns_config_proto_enumTypes[2]
-}
-
-func (x CacheStrategy) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use CacheStrategy.Descriptor instead.
-func (CacheStrategy) EnumDescriptor() ([]byte, []int) {
-	return file_app_dns_config_proto_rawDescGZIP(), []int{2}
-}
-
 type NameServer struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
 	Address           *net.Endpoint                `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
-	ClientIp          []byte                       `protobuf:"bytes,5,opt,name=client_ip,json=clientIp,proto3" json:"client_ip,omitempty"`
-	SkipFallback      bool                         `protobuf:"varint,6,opt,name=skipFallback,proto3" json:"skipFallback,omitempty"`
 	PrioritizedDomain []*NameServer_PriorityDomain `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"`
 	Geoip             []*router.GeoIP              `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"`
 	OriginalRules     []*NameServer_OriginalRule   `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"`
@@ -229,20 +129,6 @@ func (x *NameServer) GetAddress() *net.Endpoint {
 	return nil
 }
 
-func (x *NameServer) GetClientIp() []byte {
-	if x != nil {
-		return x.ClientIp
-	}
-	return nil
-}
-
-func (x *NameServer) GetSkipFallback() bool {
-	if x != nil {
-		return x.SkipFallback
-	}
-	return false
-}
-
 func (x *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain {
 	if x != nil {
 		return x.PrioritizedDomain
@@ -288,10 +174,6 @@ type Config struct {
 	StaticHosts []*Config_HostMapping `protobuf:"bytes,4,rep,name=static_hosts,json=staticHosts,proto3" json:"static_hosts,omitempty"`
 	// Tag is the inbound tag of DNS client.
 	Tag string `protobuf:"bytes,6,opt,name=tag,proto3" json:"tag,omitempty"`
-	// DisableCache disables DNS cache
-	CacheStrategy   CacheStrategy `protobuf:"varint,8,opt,name=cache_strategy,json=cacheStrategy,proto3,enum=xray.app.dns.CacheStrategy" json:"cache_strategy,omitempty"`
-	QueryStrategy   QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
-	DisableFallback bool          `protobuf:"varint,10,opt,name=disableFallback,proto3" json:"disableFallback,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -370,27 +252,6 @@ func (x *Config) GetTag() string {
 	return ""
 }
 
-func (x *Config) GetCacheStrategy() CacheStrategy {
-	if x != nil {
-		return x.CacheStrategy
-	}
-	return CacheStrategy_Cache_ALL
-}
-
-func (x *Config) GetQueryStrategy() QueryStrategy {
-	if x != nil {
-		return x.QueryStrategy
-	}
-	return QueryStrategy_USE_IP
-}
-
-func (x *Config) GetDisableFallback() bool {
-	if x != nil {
-		return x.DisableFallback
-	}
-	return false
-}
-
 type NameServer_PriorityDomain struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -510,7 +371,8 @@ type Config_HostMapping struct {
 	Domain string             `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
 	Ip     [][]byte           `protobuf:"bytes,3,rep,name=ip,proto3" json:"ip,omitempty"`
 	// ProxiedDomain indicates the mapped domain has the same IP address on this
-	// domain. Xray will use this domain for IP queries.
+	// domain. Xray will use this domain for IP queries. This field is only
+	// effective if ip is empty.
 	ProxiedDomain string `protobuf:"bytes,4,opt,name=proxied_domain,json=proxiedDomain,proto3" json:"proxied_domain,omitempty"`
 }
 
@@ -584,101 +446,77 @@ var file_app_dns_config_proto_rawDesc = []byte{
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 }
 
 var (
@@ -693,41 +531,37 @@ func file_app_dns_config_proto_rawDescGZIP() []byte {
 	return file_app_dns_config_proto_rawDescData
 }
 
-var file_app_dns_config_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
+var file_app_dns_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
 var file_app_dns_config_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
 var file_app_dns_config_proto_goTypes = []interface{}{
 	(DomainMatchingType)(0),           // 0: xray.app.dns.DomainMatchingType
-	(QueryStrategy)(0),                // 1: xray.app.dns.QueryStrategy
+	(*NameServer)(nil),                // 1: xray.app.dns.NameServer
-	(CacheStrategy)(0),                // 2: xray.app.dns.CacheStrategy
+	(*Config)(nil),                    // 2: xray.app.dns.Config
-	(*NameServer)(nil),                // 3: xray.app.dns.NameServer
+	(*NameServer_PriorityDomain)(nil), // 3: xray.app.dns.NameServer.PriorityDomain
-	(*Config)(nil),                    // 4: xray.app.dns.Config
+	(*NameServer_OriginalRule)(nil),   // 4: xray.app.dns.NameServer.OriginalRule
-	(*NameServer_PriorityDomain)(nil), // 5: xray.app.dns.NameServer.PriorityDomain
+	nil,                               // 5: xray.app.dns.Config.HostsEntry
-	(*NameServer_OriginalRule)(nil),   // 6: xray.app.dns.NameServer.OriginalRule
+	(*Config_HostMapping)(nil),        // 6: xray.app.dns.Config.HostMapping
-	nil,                               // 7: xray.app.dns.Config.HostsEntry
+	(*net.Endpoint)(nil),              // 7: xray.common.net.Endpoint
-	(*Config_HostMapping)(nil),        // 8: xray.app.dns.Config.HostMapping
+	(*router.GeoIP)(nil),              // 8: xray.app.router.GeoIP
-	(*net.Endpoint)(nil),              // 9: xray.common.net.Endpoint
+	(*net.IPOrDomain)(nil),            // 9: xray.common.net.IPOrDomain
-	(*router.GeoIP)(nil),              // 10: xray.app.router.GeoIP
-	(*net.IPOrDomain)(nil),            // 11: xray.common.net.IPOrDomain
 }
 var file_app_dns_config_proto_depIdxs = []int32{
-	9,  // 0: xray.app.dns.NameServer.address:type_name -> xray.common.net.Endpoint
+	7,  // 0: xray.app.dns.NameServer.address:type_name -> xray.common.net.Endpoint
-	5,  // 1: xray.app.dns.NameServer.prioritized_domain:type_name -> xray.app.dns.NameServer.PriorityDomain
+	3,  // 1: xray.app.dns.NameServer.prioritized_domain:type_name -> xray.app.dns.NameServer.PriorityDomain
-	10, // 2: xray.app.dns.NameServer.geoip:type_name -> xray.app.router.GeoIP
+	8,  // 2: xray.app.dns.NameServer.geoip:type_name -> xray.app.router.GeoIP
-	6,  // 3: xray.app.dns.NameServer.original_rules:type_name -> xray.app.dns.NameServer.OriginalRule
+	4,  // 3: xray.app.dns.NameServer.original_rules:type_name -> xray.app.dns.NameServer.OriginalRule
-	9,  // 4: xray.app.dns.Config.NameServers:type_name -> xray.common.net.Endpoint
+	7,  // 4: xray.app.dns.Config.NameServers:type_name -> xray.common.net.Endpoint
-	3,  // 5: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
+	1,  // 5: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
-	7,  // 6: xray.app.dns.Config.Hosts:type_name -> xray.app.dns.Config.HostsEntry
+	5,  // 6: xray.app.dns.Config.Hosts:type_name -> xray.app.dns.Config.HostsEntry
-	8,  // 7: xray.app.dns.Config.static_hosts:type_name -> xray.app.dns.Config.HostMapping
+	6,  // 7: xray.app.dns.Config.static_hosts:type_name -> xray.app.dns.Config.HostMapping
-	2,  // 8: xray.app.dns.Config.cache_strategy:type_name -> xray.app.dns.CacheStrategy
+	0,  // 8: xray.app.dns.NameServer.PriorityDomain.type:type_name -> xray.app.dns.DomainMatchingType
-	1,  // 9: xray.app.dns.Config.query_strategy:type_name -> xray.app.dns.QueryStrategy
+	9,  // 9: xray.app.dns.Config.HostsEntry.value:type_name -> xray.common.net.IPOrDomain
-	0,  // 10: xray.app.dns.NameServer.PriorityDomain.type:type_name -> xray.app.dns.DomainMatchingType
+	0,  // 10: xray.app.dns.Config.HostMapping.type:type_name -> xray.app.dns.DomainMatchingType
-	11, // 11: xray.app.dns.Config.HostsEntry.value:type_name -> xray.common.net.IPOrDomain
+	11, // [11:11] is the sub-list for method output_type
-	0,  // 12: xray.app.dns.Config.HostMapping.type:type_name -> xray.app.dns.DomainMatchingType
+	11, // [11:11] is the sub-list for method input_type
-	13, // [13:13] is the sub-list for method output_type
+	11, // [11:11] is the sub-list for extension type_name
-	13, // [13:13] is the sub-list for method input_type
+	11, // [11:11] is the sub-list for extension extendee
-	13, // [13:13] is the sub-list for extension type_name
+	0,  // [0:11] is the sub-list for field type_name
-	13, // [13:13] is the sub-list for extension extendee
-	0,  // [0:13] is the sub-list for field type_name
 }
 
 func init() { file_app_dns_config_proto_init() }
@@ -802,7 +636,7 @@ func file_app_dns_config_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_dns_config_proto_rawDesc,
-			NumEnums:      3,
+			NumEnums:      1,
 			NumMessages:   6,
 			NumExtensions: 0,
 			NumServices:   0,

app/dns/config.proto

@@ -12,8 +12,6 @@ import "app/router/config.proto";
 
 message NameServer {
   xray.common.net.Endpoint address = 1;
-  bytes client_ip = 5;
-  bool skipFallback = 6;
 
   message PriorityDomain {
     DomainMatchingType type = 1;
@@ -37,18 +35,6 @@ enum DomainMatchingType {
   Regex = 3;
 }
 
-enum QueryStrategy {
-  USE_IP = 0;
-  USE_IP4 = 1;
-  USE_IP6 = 2;
-}
-
-enum CacheStrategy {
-  Cache_ALL = 0;
-  Cache_NOERROR = 1;
-  Cache_DISABLE = 2;
-}
-
 message Config {
   // Nameservers used by this DNS. Only traditional UDP servers are support at
   // the moment. A special value 'localhost' as a domain address can be set to
@@ -73,7 +59,8 @@ message Config {
     repeated bytes ip = 3;
 
     // ProxiedDomain indicates the mapped domain has the same IP address on this
-    // domain. Xray will use this domain for IP queries.
+    // domain. Xray will use this domain for IP queries. This field is only
+    // effective if ip is empty.
     string proxied_domain = 4;
   }
 
@@ -83,11 +70,4 @@ message Config {
   string tag = 6;
 
   reserved 7;
-
-  // DisableCache disables DNS cache
-  CacheStrategy cache_strategy = 8;
-
-  QueryStrategy query_strategy = 9;
-
-  bool disableFallback = 10;
 }

app/dns/dns.go

@@ -2,312 +2,3 @@
 package dns
 
 //go:generate go run github.com/xtls/xray-core/common/errors/errorgen
-
-import (
-	"context"
-	"fmt"
-	"strings"
-	"sync"
-
-	"github.com/xtls/xray-core/app/router"
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/session"
-	"github.com/xtls/xray-core/common/strmatcher"
-	"github.com/xtls/xray-core/features"
-	"github.com/xtls/xray-core/features/dns"
-)
-
-// DNS is a DNS rely server.
-type DNS struct {
-	sync.Mutex
-	tag             string
-	cacheStrategy   CacheStrategy
-	disableFallback bool
-	ipOption        *dns.IPOption
-	hosts           *StaticHosts
-	clients         []*Client
-	ctx             context.Context
-	domainMatcher   strmatcher.IndexMatcher
-	matcherInfos    []DomainMatcherInfo
-}
-
-// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
-type DomainMatcherInfo struct {
-	clientIdx     uint16
-	domainRuleIdx uint16
-}
-
-// New creates a new DNS server with given configuration.
-func New(ctx context.Context, config *Config) (*DNS, error) {
-	var tag string
-	if len(config.Tag) > 0 {
-		tag = config.Tag
-	} else {
-		tag = generateRandomTag()
-	}
-
-	var clientIP net.IP
-	switch len(config.ClientIp) {
-	case 0, net.IPv4len, net.IPv6len:
-		clientIP = net.IP(config.ClientIp)
-	default:
-		return nil, newError("unexpected client IP length ", len(config.ClientIp))
-	}
-
-	var ipOption *dns.IPOption
-	switch config.QueryStrategy {
-	case QueryStrategy_USE_IP:
-		ipOption = &dns.IPOption{
-			IPv4Enable: true,
-			IPv6Enable: true,
-			FakeEnable: false,
-		}
-	case QueryStrategy_USE_IP4:
-		ipOption = &dns.IPOption{
-			IPv4Enable: true,
-			IPv6Enable: false,
-			FakeEnable: false,
-		}
-	case QueryStrategy_USE_IP6:
-		ipOption = &dns.IPOption{
-			IPv4Enable: false,
-			IPv6Enable: true,
-			FakeEnable: false,
-		}
-	}
-
-	hosts, err := NewStaticHosts(config.StaticHosts, config.Hosts)
-	if err != nil {
-		return nil, newError("failed to create hosts").Base(err)
-	}
-
-	clients := []*Client{}
-	domainRuleCount := 0
-	for _, ns := range config.NameServer {
-		domainRuleCount += len(ns.PrioritizedDomain)
-	}
-
-	// MatcherInfos is ensured to cover the maximum index domainMatcher could return, where matcher's index starts from 1
-	matcherInfos := make([]DomainMatcherInfo, domainRuleCount+1)
-	domainMatcher := &strmatcher.MatcherGroup{}
-	geoipContainer := router.GeoIPMatcherContainer{}
-
-	for _, endpoint := range config.NameServers {
-		features.PrintDeprecatedFeatureWarning("simple DNS server")
-		client, err := NewSimpleClient(ctx, endpoint, clientIP)
-		if err != nil {
-			return nil, newError("failed to create client").Base(err)
-		}
-		clients = append(clients, client)
-	}
-
-	for _, ns := range config.NameServer {
-		clientIdx := len(clients)
-		updateDomain := func(domainRule strmatcher.Matcher, originalRuleIdx int, matcherInfos []DomainMatcherInfo) error {
-			midx := domainMatcher.Add(domainRule)
-			matcherInfos[midx] = DomainMatcherInfo{
-				clientIdx:     uint16(clientIdx),
-				domainRuleIdx: uint16(originalRuleIdx),
-			}
-			return nil
-		}
-
-		myClientIP := clientIP
-		switch len(ns.ClientIp) {
-		case net.IPv4len, net.IPv6len:
-			myClientIP = net.IP(ns.ClientIp)
-		}
-		client, err := NewClient(ctx, ns, myClientIP, geoipContainer, &matcherInfos, updateDomain)
-		if err != nil {
-			return nil, newError("failed to create client").Base(err)
-		}
-		clients = append(clients, client)
-	}
-
-	// If there is no DNS client in config, add a `localhost` DNS client
-	if len(clients) == 0 {
-		clients = append(clients, NewLocalDNSClient())
-	}
-
-	return &DNS{
-		tag:             tag,
-		hosts:           hosts,
-		ipOption:        ipOption,
-		clients:         clients,
-		ctx:             ctx,
-		domainMatcher:   domainMatcher,
-		matcherInfos:    matcherInfos,
-		cacheStrategy:   config.CacheStrategy,
-		disableFallback: config.DisableFallback,
-	}, nil
-}
-
-// Type implements common.HasType.
-func (*DNS) Type() interface{} {
-	return dns.ClientType()
-}
-
-// Start implements common.Runnable.
-func (s *DNS) Start() error {
-	return nil
-}
-
-// Close implements common.Closable.
-func (s *DNS) Close() error {
-	return nil
-}
-
-// IsOwnLink implements proxy.dns.ownLinkVerifier
-func (s *DNS) IsOwnLink(ctx context.Context) bool {
-	inbound := session.InboundFromContext(ctx)
-	return inbound != nil && inbound.Tag == s.tag
-}
-
-// LookupIP implements dns.Client.
-func (s *DNS) LookupIP(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, s.ipOption.Copy())
-}
-
-// LookupOptions implements dns.Client.
-func (s *DNS) LookupOptions(domain string, opts ...dns.Option) ([]net.IP, error) {
-	opt := s.ipOption.Copy()
-	for _, o := range opts {
-		if o != nil {
-			o(opt)
-		}
-	}
-
-	return s.lookupIPInternal(domain, opt)
-}
-
-// LookupIPv4 implements dns.IPv4Lookup.
-func (s *DNS) LookupIPv4(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, &dns.IPOption{
-		IPv4Enable: true,
-	})
-}
-
-// LookupIPv6 implements dns.IPv6Lookup.
-func (s *DNS) LookupIPv6(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, &dns.IPOption{
-		IPv6Enable: true,
-	})
-}
-
-func (s *DNS) lookupIPInternal(domain string, option *dns.IPOption) ([]net.IP, error) {
-	if domain == "" {
-		return nil, newError("empty domain name")
-	}
-	if isQuery(option) {
-		return nil, newError("empty option: Impossible.").AtWarning()
-	}
-
-	// Normalize the FQDN form query
-	if strings.HasSuffix(domain, ".") {
-		domain = domain[:len(domain)-1]
-	}
-
-	// Static host lookup
-	switch addrs := s.hosts.Lookup(domain, option); {
-	case addrs == nil: // Domain not recorded in static host
-		break
-	case len(addrs) == 0: // Domain recorded, but no valid IP returned (e.g. IPv4 address with only IPv6 enabled)
-		return nil, dns.ErrEmptyResponse
-	case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Domain replacement
-		newError("domain replaced: ", domain, " -> ", addrs[0].Domain()).WriteToLog()
-		domain = addrs[0].Domain()
-	default:
-		// Successfully found ip records in static host.
-		// Skip hosts mapping result in FakeDNS query.
-		if isIPQuery(option) {
-			newError("returning ", len(addrs), " IP(s) for domain ", domain, " -> ", addrs).WriteToLog()
-			return toNetIP(addrs)
-		}
-	}
-
-	// Name servers lookup
-	errs := []error{}
-	ctx := session.ContextWithInbound(s.ctx, &session.Inbound{Tag: s.tag})
-	for _, client := range s.sortClients(domain, option) {
-		ips, err := client.QueryIP(ctx, domain, *option, s.cacheStrategy)
-		if len(ips) > 0 {
-			return ips, nil
-		}
-		if err != nil {
-			newError("failed to lookup ip for domain ", domain, " at server ", client.Name()).Base(err).WriteToLog()
-			errs = append(errs, err)
-		}
-		if err != context.Canceled && err != context.DeadlineExceeded && err != errExpectedIPNonMatch {
-			return nil, err
-		}
-	}
-
-	return nil, newError("returning nil for domain ", domain).Base(errors.Combine(errs...))
-}
-
-func (s *DNS) sortClients(domain string, option *dns.IPOption) []*Client {
-	clients := make([]*Client, 0, len(s.clients))
-	clientUsed := make([]bool, len(s.clients))
-	clientNames := make([]string, 0, len(s.clients))
-	domainRules := []string{}
-
-	defer func() {
-		if len(domainRules) > 0 {
-			newError("domain ", domain, " matches following rules: ", domainRules).AtDebug().WriteToLog()
-		}
-		if len(clientNames) > 0 {
-			newError("domain ", domain, " will use DNS in order: ", clientNames).AtDebug().WriteToLog()
-		}
-		if len(clients) == 0 {
-			clients = append(clients, s.clients[0])
-			clientNames = append(clientNames, s.clients[0].Name())
-			newError("domain ", domain, " will use the first DNS: ", clientNames).AtDebug().WriteToLog()
-		}
-	}()
-
-	// Priority domain matching
-	for _, match := range s.domainMatcher.Match(domain) {
-		info := s.matcherInfos[match]
-		client := s.clients[info.clientIdx]
-		domainRule := client.domains[info.domainRuleIdx]
-		if !canQueryOnClient(option, client) {
-			newError("skipping the client " + client.Name()).AtDebug().WriteToLog()
-			continue
-		}
-		domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", domainRule, info.clientIdx))
-		if clientUsed[info.clientIdx] {
-			continue
-		}
-		clientUsed[info.clientIdx] = true
-		clients = append(clients, client)
-		clientNames = append(clientNames, client.Name())
-	}
-
-	if !s.disableFallback {
-		// Default round-robin query
-		for idx, client := range s.clients {
-			if clientUsed[idx] || client.skipFallback {
-				continue
-			}
-
-			if !canQueryOnClient(option, client) {
-				newError("skipping the client " + client.Name()).AtDebug().WriteToLog()
-				continue
-			}
-
-			clientUsed[idx] = true
-			clients = append(clients, client)
-			clientNames = append(clientNames, client.Name())
-		}
-	}
-
-	return clients
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
-		return New(ctx, config.(*Config))
-	}))
-}

app/dns/dohdns.go

@@ -42,10 +42,10 @@ type DoHNameServer struct {
 	name       string
 }
 
-// NewDoHNameServer creates DOH server object for remote resolving
+// NewDoHNameServer creates DOH client object for remote resolving
-func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServer, error) {
+func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.IP) (*DoHNameServer, error) {
 	newError("DNS: created Remote DOH client for ", url.String()).AtInfo().WriteToLog()
-	s := baseDOHNameServer(url, "DOH")
+	s := baseDOHNameServer(url, "DOH", clientIP)
 
 	s.dispatcher = dispatcher
 	tr := &http.Transport{
@@ -80,12 +80,6 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServ
 			if err != nil {
 				return nil, err
 			}
-			log.Record(&log.AccessMessage{
-				From:   "DoH",
-				To:     s.dohURL,
-				Status: log.AccessAccepted,
-				Detour: "local",
-			})
 
 			cc := common.ChainedClosable{}
 			if cw, ok := link.Writer.(common.Closable); ok {
@@ -110,9 +104,9 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServ
 }
 
 // NewDoHLocalNameServer creates DOH client object for local resolving
-func NewDoHLocalNameServer(url *url.URL) *DoHNameServer {
+func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
 	url.Scheme = "https"
-	s := baseDOHNameServer(url, "DOHL")
+	s := baseDOHNameServer(url, "DOHL", clientIP)
 	tr := &http.Transport{
 		IdleConnTimeout:   90 * time.Second,
 		ForceAttemptHTTP2: true,
@@ -142,9 +136,10 @@ func NewDoHLocalNameServer(url *url.URL) *DoHNameServer {
 	return s
 }
 
-func baseDOHNameServer(url *url.URL, prefix string) *DoHNameServer {
+func baseDOHNameServer(url *url.URL, prefix string, clientIP net.IP) *DoHNameServer {
 	s := &DoHNameServer{
 		ips:      make(map[string]record),
+		clientIP: clientIP,
 		pub:      pubsub.NewService(),
 		name:     prefix + "//" + url.Host,
 		dohURL:   url.String(),
@@ -157,7 +152,7 @@ func baseDOHNameServer(url *url.URL, prefix string) *DoHNameServer {
 	return s
 }
 
-// Name implements Server.
+// Name returns client name
 func (s *DoHNameServer) Name() string {
 	return s.name
 }
@@ -240,7 +235,7 @@ func (s *DoHNameServer) newReqID() uint16 {
 	return uint16(atomic.AddUint32(&s.reqID, 1))
 }
 
-func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption) {
+func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option dns_feature.IPOption) {
 	newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))
 
 	if s.name+"." == "DOH//"+domain {
@@ -248,7 +243,7 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, clientIP n
 		return
 	}
 
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
+	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP))
 
 	var deadline time.Time
 	if d, ok := ctx.Deadline(); ok {
@@ -270,7 +265,7 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, clientIP n
 
 			dnsCtx = session.ContextWithContent(dnsCtx, &session.Content{
 				Protocol: "https",
-				SkipDNSResolve: true,
+				//SkipRoutePick: true,
 			})
 
 			// forced to use mux for DOH
@@ -354,7 +349,7 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option dns_feature.IPOpt
 	}
 
 	if len(ips) > 0 {
-		return toNetIP(ips)
+		return toNetIP(ips), nil
 	}
 
 	if lastErr != nil {
@@ -368,22 +363,16 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option dns_feature.IPOpt
 	return nil, errRecordNotFound
 }
 
-// QueryIP implements Server.
+// QueryIP is called from dns.Server->queryIPTimeout
-func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, cs CacheStrategy) ([]net.IP, error) { // nolint: dupl
+func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, error) { // nolint: dupl
 	fqdn := Fqdn(domain)
 
-	if cs == CacheStrategy_Cache_DISABLE {
-		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
-	} else {
 	ips, err := s.findIPsForDomain(fqdn, option)
 	if err != errRecordNotFound {
-			if cs == CacheStrategy_Cache_NOERROR && err == nil {
 		newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
 		log.Record(&log.DNSLog{s.name, domain, ips, log.DNSCacheHit, 0, err})
 		return ips, err
 	}
-		}
-	}
 
 	// ipv4 and ipv6 belong to different subscription groups
 	var sub4, sub6 *pubsub.Subscriber
@@ -411,7 +400,7 @@ func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, clientIP net
 		}
 		close(done)
 	}()
-	s.sendQuery(ctx, fqdn, clientIP, option)
+	s.sendQuery(ctx, fqdn, option)
 	start := time.Now()
 
 	for {

app/dns/hosts.go

@@ -14,6 +14,25 @@ type StaticHosts struct {
 	matchers *strmatcher.MatcherGroup
 }
 
+var typeMap = map[DomainMatchingType]strmatcher.Type{
+	DomainMatchingType_Full:      strmatcher.Full,
+	DomainMatchingType_Subdomain: strmatcher.Domain,
+	DomainMatchingType_Keyword:   strmatcher.Substr,
+	DomainMatchingType_Regex:     strmatcher.Regex,
+}
+
+func toStrMatcher(t DomainMatchingType, domain string) (strmatcher.Matcher, error) {
+	strMType, f := typeMap[t]
+	if !f {
+		return nil, newError("unknown mapping type", t).AtWarning()
+	}
+	matcher, err := strMType.New(domain)
+	if err != nil {
+		return nil, newError("failed to create str matcher").Base(err)
+	}
+	return matcher, nil
+}
+
 // NewStaticHosts creates a new StaticHosts instance.
 func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDomain) (*StaticHosts, error) {
 	g := new(strmatcher.MatcherGroup)
@@ -47,9 +66,6 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 		id := g.Add(matcher)
 		ips := make([]net.Address, 0, len(mapping.Ip)+1)
 		switch {
-		case len(mapping.ProxiedDomain) > 0:
-			ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
-
 		case len(mapping.Ip) > 0:
 			for _, ip := range mapping.Ip {
 				addr := net.IPAddress(ip)
@@ -59,56 +75,49 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 				ips = append(ips, addr)
 			}
 
+		case len(mapping.ProxiedDomain) > 0:
+			ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
+
 		default:
 			return nil, newError("neither IP address nor proxied domain specified for domain: ", mapping.Domain).AtWarning()
 		}
 
+		// Special handling for localhost IPv6. This is a dirty workaround as JSON config supports only single IP mapping.
+		if len(ips) == 1 && ips[0] == net.LocalHostIP {
+			ips = append(ips, net.LocalHostIPv6)
+		}
+
 		sh.ips[id] = ips
 	}
 
 	return sh, nil
 }
 
-func filterIP(ips []net.Address, option *dns.IPOption) []net.Address {
+func filterIP(ips []net.Address, option dns.IPOption) []net.Address {
 	filtered := make([]net.Address, 0, len(ips))
 	for _, ip := range ips {
 		if (ip.Family().IsIPv4() && option.IPv4Enable) || (ip.Family().IsIPv6() && option.IPv6Enable) {
 			filtered = append(filtered, ip)
 		}
 	}
+	if len(filtered) == 0 {
+		return nil
+	}
 	return filtered
 }
 
-func (h *StaticHosts) lookupInternal(domain string) []net.Address {
+// LookupIP returns IP address for the given domain, if exists in this StaticHosts.
-	var ips []net.Address
+func (h *StaticHosts) LookupIP(domain string, option dns.IPOption) []net.Address {
-	for _, id := range h.matchers.Match(domain) {
+	indices := h.matchers.Match(domain)
+	if len(indices) == 0 {
+		return nil
+	}
+	ips := []net.Address{}
+	for _, id := range indices {
 		ips = append(ips, h.ips[id]...)
 	}
 	if len(ips) == 1 && ips[0].Family().IsDomain() {
 		return ips
 	}
-	return ips
+	return filterIP(ips, option)
-}
-
-func (h *StaticHosts) lookup(domain string, option *dns.IPOption, maxDepth int) []net.Address {
-	switch addrs := h.lookupInternal(domain); {
-	case len(addrs) == 0: // Not recorded in static hosts, return nil
-		return nil
-	case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Try to unwrap domain
-		newError("found replaced domain: ", domain, " -> ", addrs[0].Domain(), ". Try to unwrap it").AtDebug().WriteToLog()
-		if maxDepth > 0 {
-			unwrapped := h.lookup(addrs[0].Domain(), option, maxDepth-1)
-			if unwrapped != nil {
-				return unwrapped
-			}
-		}
-		return addrs
-	default: // IP record found, return a non-nil IP array
-		return filterIP(addrs, option)
-	}
-}
-
-// Lookup returns IP addresses or proxied domain for the given domain, if exists in this StaticHosts.
-func (h *StaticHosts) Lookup(domain string, option *dns.IPOption) []net.Address {
-	return h.lookup(domain, option, 5)
 }

app/dns/hosts_test.go

@@ -20,20 +20,6 @@ func TestStaticHosts(t *testing.T) {
 				{1, 1, 1, 1},
 			},
 		},
-		{
-			Type:   DomainMatchingType_Full,
-			Domain: "proxy.example.com",
-			Ip: [][]byte{
-				{1, 2, 3, 4},
-				{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
-			},
-			ProxiedDomain: "another-proxy.example.com",
-		},
-		{
-			Type:          DomainMatchingType_Full,
-			Domain:        "proxy2.example.com",
-			ProxiedDomain: "proxy.example.com",
-		},
 		{
 			Type:   DomainMatchingType_Subdomain,
 			Domain: "example.cn",
@@ -46,7 +32,6 @@ func TestStaticHosts(t *testing.T) {
 			Domain: "baidu.com",
 			Ip: [][]byte{
 				{127, 0, 0, 1},
-				{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
 			},
 		},
 	}
@@ -55,7 +40,7 @@ func TestStaticHosts(t *testing.T) {
 	common.Must(err)
 
 	{
-		ips := hosts.Lookup("example.com", &dns.IPOption{
+		ips := hosts.LookupIP("example.com", dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: true,
 		})
@@ -68,33 +53,7 @@ func TestStaticHosts(t *testing.T) {
 	}
 
 	{
-		domain := hosts.Lookup("proxy.example.com", &dns.IPOption{
+		ips := hosts.LookupIP("www.example.cn", dns.IPOption{
-			IPv4Enable: true,
-			IPv6Enable: false,
-		})
-		if len(domain) != 1 {
-			t.Error("expect 1 domain, but got ", len(domain))
-		}
-		if diff := cmp.Diff(domain[0].Domain(), "another-proxy.example.com"); diff != "" {
-			t.Error(diff)
-		}
-	}
-
-	{
-		domain := hosts.Lookup("proxy2.example.com", &dns.IPOption{
-			IPv4Enable: true,
-			IPv6Enable: false,
-		})
-		if len(domain) != 1 {
-			t.Error("expect 1 domain, but got ", len(domain))
-		}
-		if diff := cmp.Diff(domain[0].Domain(), "another-proxy.example.com"); diff != "" {
-			t.Error(diff)
-		}
-	}
-
-	{
-		ips := hosts.Lookup("www.example.cn", &dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: true,
 		})
@@ -107,7 +66,7 @@ func TestStaticHosts(t *testing.T) {
 	}
 
 	{
-		ips := hosts.Lookup("baidu.com", &dns.IPOption{
+		ips := hosts.LookupIP("baidu.com", dns.IPOption{
 			IPv4Enable: false,
 			IPv6Enable: true,
 		})

app/dns/nameserver.go

@@ -2,211 +2,40 @@ package dns
 
 import (
 	"context"
-	"net/url"
-	"strings"
-	"time"
 
-	"github.com/xtls/xray-core/app/router"
-	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/strmatcher"
-	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/dns"
-	"github.com/xtls/xray-core/features/routing"
+	"github.com/xtls/xray-core/features/dns/localdns"
 )
 
-// Server is the interface for Name Server.
+// Client is the interface for DNS client.
-type Server interface {
+type Client interface {
 	// Name of the Client.
 	Name() string
+
 	// QueryIP sends IP queries to its configured server.
-	QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns.IPOption, cs CacheStrategy) ([]net.IP, error)
+	QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, error)
 }
 
-// Client is the interface for DNS client.
+type LocalNameServer struct {
-type Client struct {
+	client *localdns.Client
-	server       Server
-	clientIP     net.IP
-	skipFallback bool
-	domains      []string
-	expectIPs    []*router.GeoIPMatcher
 }
 
-var errExpectedIPNonMatch = errors.New("expectIPs not match")
+func (s *LocalNameServer) QueryIP(_ context.Context, domain string, option dns.IPOption) ([]net.IP, error) {
-
+	if option.IPv4Enable || option.IPv6Enable {
-// NewServer creates a name server object according to the network destination url.
+		return s.client.LookupIP(domain, option)
-func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, error) {
-	if address := dest.Address; address.Family().IsDomain() {
-		u, err := url.Parse(address.Domain())
-		if err != nil {
-			return nil, err
-		}
-		switch {
-		case strings.EqualFold(u.String(), "localhost"):
-			return NewLocalNameServer(), nil
-		case strings.EqualFold(u.Scheme, "https"): // DOH Remote mode
-			return NewDoHNameServer(u, dispatcher)
-		case strings.EqualFold(u.Scheme, "https+local"): // DOH Local mode
-			return NewDoHLocalNameServer(u), nil
-		case strings.EqualFold(u.Scheme, "quic+local"): // DNS-over-QUIC Local mode
-			return NewQUICNameServer(u)
-		case strings.EqualFold(u.String(), "fakedns"):
-			return NewFakeDNSServer(), nil
-		}
-	}
-	if dest.Network == net.Network_Unknown {
-		dest.Network = net.Network_UDP
-	}
-	if dest.Network == net.Network_UDP { // UDP classic DNS mode
-		return NewClassicNameServer(dest, dispatcher), nil
-	}
-	return nil, newError("No available name server could be created from ", dest).AtWarning()
 	}
 
-// NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs.
+	return nil, newError("neither IPv4 nor IPv6 is enabled")
-func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container router.GeoIPMatcherContainer, matcherInfos *[]DomainMatcherInfo, updateDomainRule func(strmatcher.Matcher, int, []DomainMatcherInfo) error) (*Client, error) {
-	client := &Client{}
-
-	err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
-		// Create a new server for each client for now
-		server, err := NewServer(ns.Address.AsDestination(), dispatcher)
-		if err != nil {
-			return newError("failed to create nameserver").Base(err).AtWarning()
 }
 
-		// Priotize local domains with specific TLDs or without any dot to local DNS
+func (s *LocalNameServer) Name() string {
-		if _, isLocalDNS := server.(*LocalNameServer); isLocalDNS {
+	return "localhost"
-			ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
-			ns.OriginalRules = append(ns.OriginalRules, localTLDsAndDotlessDomainsRule)
-			// The following lines is a solution to avoid core panics（rule index out of range） when setting `localhost` DNS client in config.
-			// Because the `localhost` DNS client will apend len(localTLDsAndDotlessDomains) rules into matcherInfos to match `geosite:private` default rule.
-			// But `matcherInfos` has no enough length to add rules, which leads to core panics (rule index out of range).
-			// To avoid this, the length of `matcherInfos` must be equal to the expected, so manually append it with Golang default zero value first for later modification.
-			for i := 0; i < len(localTLDsAndDotlessDomains); i++ {
-				*matcherInfos = append(*matcherInfos, DomainMatcherInfo{
-					clientIdx:     uint16(0),
-					domainRuleIdx: uint16(0),
-				})
-			}
 }
 
-		// Establish domain rules
+func NewLocalNameServer() *LocalNameServer {
-		var rules []string
+	newError("DNS: created localhost client").AtInfo().WriteToLog()
-		ruleCurr := 0
+	return &LocalNameServer{
-		ruleIter := 0
+		client: localdns.New(),
-		for _, domain := range ns.PrioritizedDomain {
-			domainRule, err := toStrMatcher(domain.Type, domain.Domain)
-			if err != nil {
-				return newError("failed to create prioritized domain").Base(err).AtWarning()
-			}
-			originalRuleIdx := ruleCurr
-			if ruleCurr < len(ns.OriginalRules) {
-				rule := ns.OriginalRules[ruleCurr]
-				if ruleCurr >= len(rules) {
-					rules = append(rules, rule.Rule)
-				}
-				ruleIter++
-				if ruleIter >= int(rule.Size) {
-					ruleIter = 0
-					ruleCurr++
-				}
-			} else { // No original rule, generate one according to current domain matcher (majorly for compatibility with tests)
-				rules = append(rules, domainRule.String())
-				ruleCurr++
-			}
-			err = updateDomainRule(domainRule, originalRuleIdx, *matcherInfos)
-			if err != nil {
-				return newError("failed to create prioritized domain").Base(err).AtWarning()
 	}
 }
-
-		// Establish expected IPs
-		var matchers []*router.GeoIPMatcher
-		for _, geoip := range ns.Geoip {
-			matcher, err := container.Add(geoip)
-			if err != nil {
-				return newError("failed to create ip matcher").Base(err).AtWarning()
-			}
-			matchers = append(matchers, matcher)
-		}
-
-		if len(clientIP) > 0 {
-			switch ns.Address.Address.GetAddress().(type) {
-			case *net.IPOrDomain_Domain:
-				newError("DNS: client ", ns.Address.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
-			case *net.IPOrDomain_Ip:
-				newError("DNS: client ", ns.Address.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
-			}
-		}
-
-		client.server = server
-		client.clientIP = clientIP
-		client.domains = rules
-		client.expectIPs = matchers
-		return nil
-	})
-	return client, err
-}
-
-// NewSimpleClient creates a DNS client with a simple destination.
-func NewSimpleClient(ctx context.Context, endpoint *net.Endpoint, clientIP net.IP) (*Client, error) {
-	client := &Client{}
-	err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
-		server, err := NewServer(endpoint.AsDestination(), dispatcher)
-		if err != nil {
-			return newError("failed to create nameserver").Base(err).AtWarning()
-		}
-		client.server = server
-		client.clientIP = clientIP
-		return nil
-	})
-
-	if len(clientIP) > 0 {
-		switch endpoint.Address.GetAddress().(type) {
-		case *net.IPOrDomain_Domain:
-			newError("DNS: client ", endpoint.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
-		case *net.IPOrDomain_Ip:
-			newError("DNS: client ", endpoint.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
-		}
-	}
-
-	return client, err
-}
-
-// Name returns the server name the client manages.
-func (c *Client) Name() string {
-	return c.server.Name()
-}
-
-// QueryIP send DNS query to the name server with the client's IP.
-func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption, cs CacheStrategy) ([]net.IP, error) {
-	ctx, cancel := context.WithTimeout(ctx, 4*time.Second)
-	ips, err := c.server.QueryIP(ctx, domain, c.clientIP, option, cs)
-	cancel()
-
-	if err != nil {
-		return ips, err
-	}
-	return c.MatchExpectedIPs(domain, ips)
-}
-
-// MatchExpectedIPs matches queried domain IPs with expected IPs and returns matched ones.
-func (c *Client) MatchExpectedIPs(domain string, ips []net.IP) ([]net.IP, error) {
-	if len(c.expectIPs) == 0 {
-		return ips, nil
-	}
-	newIps := []net.IP{}
-	for _, ip := range ips {
-		for _, matcher := range c.expectIPs {
-			if matcher.Match(ip) {
-				newIps = append(newIps, ip)
-				break
-			}
-		}
-	}
-	if len(newIps) == 0 {
-		return nil, errExpectedIPNonMatch
-	}
-	newError("domain ", domain, " expectIPs ", newIps, " matched at server ", c.Name()).AtDebug().WriteToLog()
-	return newIps, nil
-}

app/dns/nameserver_doh_test.go

@@ -1,60 +0,0 @@
-package dns_test
-
-import (
-	"context"
-	"net/url"
-	"testing"
-	"time"
-
-	"github.com/google/go-cmp/cmp"
-
-	. "github.com/xtls/xray-core/app/dns"
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/net"
-	dns_feature "github.com/xtls/xray-core/features/dns"
-)
-
-func TestDOHNameServer(t *testing.T) {
-	url, err := url.Parse("https+local://1.1.1.1/dns-query")
-	common.Must(err)
-
-	s := NewDoHLocalNameServer(url)
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
-	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-	}, CacheStrategy_Cache_ALL)
-	cancel()
-	common.Must(err)
-	if len(ips) == 0 {
-		t.Error("expect some ips, but got 0")
-	}
-}
-
-func TestDOHNameServerWithCache(t *testing.T) {
-	url, err := url.Parse("https+local://1.1.1.1/dns-query")
-	common.Must(err)
-
-	s := NewDoHLocalNameServer(url)
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
-	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-	}, CacheStrategy_Cache_ALL)
-	cancel()
-	common.Must(err)
-	if len(ips) == 0 {
-		t.Error("expect some ips, but got 0")
-	}
-
-	ctx2, cancel := context.WithTimeout(context.Background(), time.Second*2)
-	ips2, err := s.QueryIP(ctx2, "google.com", net.IP(nil), dns_feature.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-	}, CacheStrategy_Cache_ALL)
-	cancel()
-	common.Must(err)
-	if r := cmp.Diff(ips2, ips); r != "" {
-		t.Fatal(r)
-	}
-}

app/dns/nameserver_fakedns.go

@@ -16,13 +16,11 @@ func NewFakeDNSServer() *FakeDNSServer {
 	return &FakeDNSServer{}
 }
 
-const FakeDNSName = "FakeDNS"
-
 func (FakeDNSServer) Name() string {
-	return FakeDNSName
+	return "FakeDNS"
 }
 
-func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ net.IP, _ dns.IPOption, _ CacheStrategy) ([]net.IP, error) {
+func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ dns.IPOption) ([]net.IP, error) {
 	if f.fakeDNSEngine == nil {
 		if err := core.RequireFeatures(ctx, func(fd dns.FakeDNSEngine) {
 			f.fakeDNSEngine = fd
@@ -32,9 +30,9 @@ func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ net.IP, _
 	}
 	ips := f.fakeDNSEngine.GetFakeIPForDomain(domain)
 
-	netIP, err := toNetIP(ips)
+	netIP := toNetIP(ips)
-	if err != nil {
+	if netIP == nil {
-		return nil, newError("Unable to convert IP to net ip").Base(err).AtError()
+		return nil, newError("Unable to convert IP to net ip").AtError()
 	}
 
 	newError(f.Name(), " got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()

app/dns/nameserver_local.go

@@ -1,53 +0,0 @@
-package dns
-
-import (
-	"context"
-
-	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/features/dns"
-	"github.com/xtls/xray-core/features/dns/localdns"
-)
-
-// LocalNameServer is an wrapper over local DNS feature.
-type LocalNameServer struct {
-	client *localdns.Client
-}
-
-// QueryIP implements Server.
-func (s *LocalNameServer) QueryIP(_ context.Context, domain string, _ net.IP, option dns.IPOption, _ CacheStrategy) ([]net.IP, error) {
-	var ips []net.IP
-	var err error
-
-	switch {
-	case option.IPv4Enable && option.IPv6Enable:
-		ips, err = s.client.LookupIP(domain)
-	case option.IPv4Enable:
-		ips, err = s.client.LookupIPv4(domain)
-	case option.IPv6Enable:
-		ips, err = s.client.LookupIPv6(domain)
-	}
-
-	if len(ips) > 0 {
-		newError("Localhost got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()
-	}
-
-	return ips, err
-}
-
-// Name implements Server.
-func (s *LocalNameServer) Name() string {
-	return "localhost"
-}
-
-// NewLocalNameServer creates localdns server object for directly lookup in system DNS.
-func NewLocalNameServer() *LocalNameServer {
-	newError("DNS: created localhost client").AtInfo().WriteToLog()
-	return &LocalNameServer{
-		client: localdns.New(),
-	}
-}
-
-// NewLocalDNSClient creates localdns client object for directly lookup in system DNS.
-func NewLocalDNSClient() *Client {
-	return &Client{server: NewLocalNameServer()}
-}

app/dns/nameserver_quic.go

@@ -1,394 +0,0 @@
-package dns
-
-import (
-	"context"
-	"net/url"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/lucas-clemente/quic-go"
-	"golang.org/x/net/dns/dnsmessage"
-	"golang.org/x/net/http2"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	"github.com/xtls/xray-core/common/log"
-	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/protocol/dns"
-	"github.com/xtls/xray-core/common/session"
-	"github.com/xtls/xray-core/common/signal/pubsub"
-	"github.com/xtls/xray-core/common/task"
-	dns_feature "github.com/xtls/xray-core/features/dns"
-	"github.com/xtls/xray-core/transport/internet/tls"
-)
-
-// NextProtoDQ - During connection establishment, DNS/QUIC support is indicated
-// by selecting the ALPN token "dq" in the crypto handshake.
-const NextProtoDQ = "doq-i00"
-
-// QUICNameServer implemented DNS over QUIC
-type QUICNameServer struct {
-	sync.RWMutex
-	ips         map[string]record
-	pub         *pubsub.Service
-	cleanup     *task.Periodic
-	reqID       uint32
-	name        string
-	destination net.Destination
-	session     quic.Session
-}
-
-// NewQUICNameServer creates DNS-over-QUIC client object for local resolving
-func NewQUICNameServer(url *url.URL) (*QUICNameServer, error) {
-	newError("DNS: created Local DNS-over-QUIC client for ", url.String()).AtInfo().WriteToLog()
-
-	var err error
-	port := net.Port(784)
-	if url.Port() != "" {
-		port, err = net.PortFromString(url.Port())
-		if err != nil {
-			return nil, err
-		}
-	}
-	dest := net.UDPDestination(net.DomainAddress(url.Hostname()), port)
-
-	s := &QUICNameServer{
-		ips:         make(map[string]record),
-		pub:         pubsub.NewService(),
-		name:        url.String(),
-		destination: dest,
-	}
-	s.cleanup = &task.Periodic{
-		Interval: time.Minute,
-		Execute:  s.Cleanup,
-	}
-
-	return s, nil
-}
-
-// Name returns client name
-func (s *QUICNameServer) Name() string {
-	return s.name
-}
-
-// Cleanup clears expired items from cache
-func (s *QUICNameServer) Cleanup() error {
-	now := time.Now()
-	s.Lock()
-	defer s.Unlock()
-
-	if len(s.ips) == 0 {
-		return newError("nothing to do. stopping...")
-	}
-
-	for domain, record := range s.ips {
-		if record.A != nil && record.A.Expire.Before(now) {
-			record.A = nil
-		}
-		if record.AAAA != nil && record.AAAA.Expire.Before(now) {
-			record.AAAA = nil
-		}
-
-		if record.A == nil && record.AAAA == nil {
-			newError(s.name, " cleanup ", domain).AtDebug().WriteToLog()
-			delete(s.ips, domain)
-		} else {
-			s.ips[domain] = record
-		}
-	}
-
-	if len(s.ips) == 0 {
-		s.ips = make(map[string]record)
-	}
-
-	return nil
-}
-
-func (s *QUICNameServer) updateIP(req *dnsRequest, ipRec *IPRecord) {
-	elapsed := time.Since(req.start)
-
-	s.Lock()
-	rec := s.ips[req.domain]
-	updated := false
-
-	switch req.reqType {
-	case dnsmessage.TypeA:
-		if isNewer(rec.A, ipRec) {
-			rec.A = ipRec
-			updated = true
-		}
-	case dnsmessage.TypeAAAA:
-		addr := make([]net.Address, 0)
-		for _, ip := range ipRec.IP {
-			if len(ip.IP()) == net.IPv6len {
-				addr = append(addr, ip)
-			}
-		}
-		ipRec.IP = addr
-		if isNewer(rec.AAAA, ipRec) {
-			rec.AAAA = ipRec
-			updated = true
-		}
-	}
-	newError(s.name, " got answer: ", req.domain, " ", req.reqType, " -> ", ipRec.IP, " ", elapsed).AtInfo().WriteToLog()
-
-	if updated {
-		s.ips[req.domain] = rec
-	}
-	switch req.reqType {
-	case dnsmessage.TypeA:
-		s.pub.Publish(req.domain+"4", nil)
-	case dnsmessage.TypeAAAA:
-		s.pub.Publish(req.domain+"6", nil)
-	}
-	s.Unlock()
-	common.Must(s.cleanup.Start())
-}
-
-func (s *QUICNameServer) newReqID() uint16 {
-	return uint16(atomic.AddUint32(&s.reqID, 1))
-}
-
-func (s *QUICNameServer) sendQuery(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption) {
-	newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))
-
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
-
-	var deadline time.Time
-	if d, ok := ctx.Deadline(); ok {
-		deadline = d
-	} else {
-		deadline = time.Now().Add(time.Second * 5)
-	}
-
-	for _, req := range reqs {
-		go func(r *dnsRequest) {
-			// generate new context for each req, using same context
-			// may cause reqs all aborted if any one encounter an error
-			dnsCtx := context.Background()
-
-			// reserve internal dns server requested Inbound
-			if inbound := session.InboundFromContext(ctx); inbound != nil {
-				dnsCtx = session.ContextWithInbound(dnsCtx, inbound)
-			}
-			dnsCtx = session.ContextWithContent(dnsCtx, &session.Content{
-				Protocol:       "quic",
-				SkipDNSResolve: true,
-			})
-			dnsCtx = log.ContextWithAccessMessage(dnsCtx, &log.AccessMessage{
-				From:   "DoQ",
-				To:     s.name,
-				Status: log.AccessAccepted,
-				Reason: "",
-			})
-
-			var cancel context.CancelFunc
-			dnsCtx, cancel = context.WithDeadline(dnsCtx, deadline)
-			defer cancel()
-
-			b, err := dns.PackMessage(r.msg)
-			if err != nil {
-				newError("failed to pack dns query").Base(err).AtError().WriteToLog()
-				return
-			}
-
-			conn, err := s.openStream(dnsCtx)
-			if err != nil {
-				newError("failed to open quic session").Base(err).AtError().WriteToLog()
-				return
-			}
-
-			_, err = conn.Write(b.Bytes())
-			if err != nil {
-				newError("failed to send query").Base(err).AtError().WriteToLog()
-				return
-			}
-
-			_ = conn.Close()
-
-			respBuf := buf.New()
-			defer respBuf.Release()
-			n, err := respBuf.ReadFrom(conn)
-			if err != nil && n == 0 {
-				newError("failed to read response").Base(err).AtError().WriteToLog()
-				return
-			}
-
-			rec, err := parseResponse(respBuf.Bytes())
-			if err != nil {
-				newError("failed to handle response").Base(err).AtError().WriteToLog()
-				return
-			}
-			s.updateIP(r, rec)
-		}(req)
-	}
-}
-
-func (s *QUICNameServer) findIPsForDomain(domain string, option dns_feature.IPOption) ([]net.IP, error) {
-	s.RLock()
-	record, found := s.ips[domain]
-	s.RUnlock()
-
-	if !found {
-		return nil, errRecordNotFound
-	}
-
-	var ips []net.Address
-	var lastErr error
-	if option.IPv6Enable && record.AAAA != nil && record.AAAA.RCode == dnsmessage.RCodeSuccess {
-		aaaa, err := record.AAAA.getIPs()
-		if err != nil {
-			lastErr = err
-		}
-		ips = append(ips, aaaa...)
-	}
-
-	if option.IPv4Enable && record.A != nil && record.A.RCode == dnsmessage.RCodeSuccess {
-		a, err := record.A.getIPs()
-		if err != nil {
-			lastErr = err
-		}
-		ips = append(ips, a...)
-	}
-
-	if len(ips) > 0 {
-		return toNetIP(ips)
-	}
-
-	if lastErr != nil {
-		return nil, lastErr
-	}
-
-	if (option.IPv4Enable && record.A != nil) || (option.IPv6Enable && record.AAAA != nil) {
-		return nil, dns_feature.ErrEmptyResponse
-	}
-
-	return nil, errRecordNotFound
-}
-
-// QueryIP is called from dns.Server->queryIPTimeout
-func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, cs CacheStrategy) ([]net.IP, error) {
-	fqdn := Fqdn(domain)
-
-	if cs == CacheStrategy_Cache_DISABLE {
-		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
-	} else {
-		ips, err := s.findIPsForDomain(fqdn, option)
-		if err != errRecordNotFound {
-			if cs == CacheStrategy_Cache_NOERROR && err == nil {
-				newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
-				log.Record(&log.DNSLog{s.name, domain, ips, log.DNSCacheHit, 0, err})
-				return ips, err
-			}
-		}
-	}
-
-	// ipv4 and ipv6 belong to different subscription groups
-	var sub4, sub6 *pubsub.Subscriber
-	if option.IPv4Enable {
-		sub4 = s.pub.Subscribe(fqdn + "4")
-		defer sub4.Close()
-	}
-	if option.IPv6Enable {
-		sub6 = s.pub.Subscribe(fqdn + "6")
-		defer sub6.Close()
-	}
-	done := make(chan interface{})
-	go func() {
-		if sub4 != nil {
-			select {
-			case <-sub4.Wait():
-			case <-ctx.Done():
-			}
-		}
-		if sub6 != nil {
-			select {
-			case <-sub6.Wait():
-			case <-ctx.Done():
-			}
-		}
-		close(done)
-	}()
-	s.sendQuery(ctx, fqdn, clientIP, option)
-	start := time.Now()
-
-	for {
-		ips, err := s.findIPsForDomain(fqdn, option)
-		if err != errRecordNotFound {
-			log.Record(&log.DNSLog{s.name, domain, ips, log.DNSQueried, time.Since(start), err})
-			return ips, err
-		}
-
-		select {
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		case <-done:
-		}
-	}
-}
-
-func isActive(s quic.Session) bool {
-	select {
-	case <-s.Context().Done():
-		return false
-	default:
-		return true
-	}
-}
-
-func (s *QUICNameServer) getSession() (quic.Session, error) {
-	var session quic.Session
-	s.RLock()
-	session = s.session
-	if session != nil && isActive(session) {
-		s.RUnlock()
-		return session, nil
-	}
-	if session != nil {
-		// we're recreating the session, let's create a new one
-		_ = session.CloseWithError(0, "")
-	}
-	s.RUnlock()
-
-	s.Lock()
-	defer s.Unlock()
-
-	var err error
-	session, err = s.openSession()
-	if err != nil {
-		// This does not look too nice, but QUIC (or maybe quic-go)
-		// doesn't seem stable enough.
-		// Maybe retransmissions aren't fully implemented in quic-go?
-		// Anyways, the simple solution is to make a second try when
-		// it fails to open the QUIC session.
-		session, err = s.openSession()
-		if err != nil {
-			return nil, err
-		}
-	}
-	s.session = session
-	return session, nil
-}
-
-func (s *QUICNameServer) openSession() (quic.Session, error) {
-	tlsConfig := tls.Config{}
-	quicConfig := &quic.Config{}
-
-	session, err := quic.DialAddrContext(context.Background(), s.destination.NetAddr(), tlsConfig.GetTLSConfig(tls.WithNextProto("http/1.1", http2.NextProtoTLS, NextProtoDQ)), quicConfig)
-	if err != nil {
-		return nil, err
-	}
-
-	return session, nil
-}
-
-func (s *QUICNameServer) openStream(ctx context.Context) (quic.Stream, error) {
-	session, err := s.getSession()
-	if err != nil {
-		return nil, err
-	}
-
-	// open a new stream
-	return session.OpenStreamSync(ctx)
-}

app/dns/nameserver_quic_test.go

@@ -1,60 +0,0 @@
-package dns_test
-
-import (
-	"context"
-	"net/url"
-	"testing"
-	"time"
-
-	"github.com/google/go-cmp/cmp"
-
-	. "github.com/xtls/xray-core/app/dns"
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/net"
-	dns_feature "github.com/xtls/xray-core/features/dns"
-)
-
-func TestQUICNameServer(t *testing.T) {
-	url, err := url.Parse("quic://dns.adguard.com")
-	common.Must(err)
-	s, err := NewQUICNameServer(url)
-	common.Must(err)
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
-	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-	}, CacheStrategy_Cache_ALL)
-	cancel()
-	common.Must(err)
-	if len(ips) == 0 {
-		t.Error("expect some ips, but got 0")
-	}
-}
-
-func TestQUICNameServerWithCache(t *testing.T) {
-	url, err := url.Parse("quic://dns.adguard.com")
-	common.Must(err)
-	s, err := NewQUICNameServer(url)
-	common.Must(err)
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
-	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-	}, CacheStrategy_Cache_ALL)
-	cancel()
-	common.Must(err)
-	if len(ips) == 0 {
-		t.Error("expect some ips, but got 0")
-	}
-
-	ctx2, cancel := context.WithTimeout(context.Background(), time.Second*5)
-	ips2, err := s.QueryIP(ctx2, "google.com", net.IP(nil), dns_feature.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-	}, CacheStrategy_Cache_ALL)
-	cancel()
-	common.Must(err)
-	if r := cmp.Diff(ips2, ips); r != "" {
-		t.Fatal(r)
-	}
-}

app/dns/nameserver_test.go

@@ -7,17 +7,17 @@ import (
 
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/net"
+	dns_feature "github.com/xtls/xray-core/features/dns"
-	"github.com/xtls/xray-core/features/dns"
 )
 
 func TestLocalNameServer(t *testing.T) {
 	s := NewLocalNameServer()
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
-	ips, err := s.QueryIP(ctx, "google.com", net.IP{}, dns.IPOption{
+	ips, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
 		IPv4Enable: true,
 		IPv6Enable: true,
-	}, CacheStrategy_Cache_ALL)
+		FakeEnable: false,
+	})
 	cancel()
 	common.Must(err)
 	if len(ips) == 0 {

app/dns/options.go

@@ -1,16 +0,0 @@
-package dns
-
-import "github.com/xtls/xray-core/features/dns"
-
-func isIPQuery(o *dns.IPOption) bool {
-	return o.IPv4Enable || o.IPv6Enable
-}
-
-func canQueryOnClient(o *dns.IPOption, c *Client) bool {
-	isIPClient := !(c.Name() == FakeDNSName)
-	return isIPClient && isIPQuery(o)
-}
-
-func isQuery(o *dns.IPOption) bool {
-	return !(o.IPv4Enable || o.IPv6Enable || o.FakeEnable)
-}

app/dns/server.go

@@ -0,0 +1,438 @@
+package dns
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/xtls/xray-core/app/router"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/strmatcher"
+	"github.com/xtls/xray-core/common/uuid"
+	core "github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features"
+	"github.com/xtls/xray-core/features/dns"
+	"github.com/xtls/xray-core/features/routing"
+	"github.com/xtls/xray-core/transport/internet"
+)
+
+// Server is a DNS rely server.
+type Server struct {
+	sync.Mutex
+	hosts         *StaticHosts
+	clientIP      net.IP
+	clients       []Client // clientIdx -> Client
+	ctx           context.Context
+	ipIndexMap    []*MultiGeoIPMatcher // clientIdx -> *MultiGeoIPMatcher
+	domainRules   [][]string           // clientIdx -> domainRuleIdx -> DomainRule
+	domainMatcher strmatcher.IndexMatcher
+	matcherInfos  []DomainMatcherInfo // matcherIdx -> DomainMatcherInfo
+	tag           string
+}
+
+// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
+type DomainMatcherInfo struct {
+	clientIdx     uint16
+	domainRuleIdx uint16
+}
+
+// MultiGeoIPMatcher for match
+type MultiGeoIPMatcher struct {
+	matchers []*router.GeoIPMatcher
+}
+
+var errExpectedIPNonMatch = errors.New("expectIPs not match")
+
+// Match check ip match
+func (c *MultiGeoIPMatcher) Match(ip net.IP) bool {
+	for _, matcher := range c.matchers {
+		if matcher.Match(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// HasMatcher check has matcher
+func (c *MultiGeoIPMatcher) HasMatcher() bool {
+	return len(c.matchers) > 0
+}
+
+func generateRandomTag() string {
+	id := uuid.New()
+	return "xray.system." + id.String()
+}
+
+// New creates a new DNS server with given configuration.
+func New(ctx context.Context, config *Config) (*Server, error) {
+	server := &Server{
+		clients: make([]Client, 0, len(config.NameServers)+len(config.NameServer)),
+		ctx:     ctx,
+		tag:     config.Tag,
+	}
+	if server.tag == "" {
+		server.tag = generateRandomTag()
+	}
+	if len(config.ClientIp) > 0 {
+		if len(config.ClientIp) != net.IPv4len && len(config.ClientIp) != net.IPv6len {
+			return nil, newError("unexpected IP length", len(config.ClientIp))
+		}
+		server.clientIP = net.IP(config.ClientIp)
+	}
+
+	hosts, err := NewStaticHosts(config.StaticHosts, config.Hosts)
+	if err != nil {
+		return nil, newError("failed to create hosts").Base(err)
+	}
+	server.hosts = hosts
+
+	addNameServer := func(ns *NameServer) int {
+		endpoint := ns.Address
+		address := endpoint.Address.AsAddress()
+
+		switch {
+		case address.Family().IsDomain() && address.Domain() == "localhost":
+			server.clients = append(server.clients, NewLocalNameServer())
+			// Priotize local domains with specific TLDs or without any dot to local DNS
+			// References:
+			// https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
+			// https://unix.stackexchange.com/questions/92441/whats-the-difference-between-local-home-and-lan
+			localTLDsAndDotlessDomains := []*NameServer_PriorityDomain{
+				{Type: DomainMatchingType_Regex, Domain: "^[^.]+$"}, // This will only match domains without any dot
+				{Type: DomainMatchingType_Subdomain, Domain: "local"},
+				{Type: DomainMatchingType_Subdomain, Domain: "localdomain"},
+				{Type: DomainMatchingType_Subdomain, Domain: "localhost"},
+				{Type: DomainMatchingType_Subdomain, Domain: "lan"},
+				{Type: DomainMatchingType_Subdomain, Domain: "home.arpa"},
+				{Type: DomainMatchingType_Subdomain, Domain: "example"},
+				{Type: DomainMatchingType_Subdomain, Domain: "invalid"},
+				{Type: DomainMatchingType_Subdomain, Domain: "test"},
+			}
+			ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
+
+		case address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https+local://"):
+			// URI schemed string treated as domain
+			// DOH Local mode
+			u, err := url.Parse(address.Domain())
+			if err != nil {
+				log.Fatalln(newError("DNS config error").Base(err))
+			}
+			server.clients = append(server.clients, NewDoHLocalNameServer(u, server.clientIP))
+
+		case address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https://"):
+			// DOH Remote mode
+			u, err := url.Parse(address.Domain())
+			if err != nil {
+				log.Fatalln(newError("DNS config error").Base(err))
+			}
+			idx := len(server.clients)
+			server.clients = append(server.clients, nil)
+
+			// need the core dispatcher, register DOHClient at callback
+			common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
+				c, err := NewDoHNameServer(u, d, server.clientIP)
+				if err != nil {
+					log.Fatalln(newError("DNS config error").Base(err))
+				}
+				server.clients[idx] = c
+			}))
+
+		case address.Family().IsDomain() && address.Domain() == "fakedns":
+			server.clients = append(server.clients, NewFakeDNSServer())
+
+		default:
+			// UDP classic DNS mode
+			dest := endpoint.AsDestination()
+			if dest.Network == net.Network_Unknown {
+				dest.Network = net.Network_UDP
+			}
+			if dest.Network == net.Network_UDP {
+				idx := len(server.clients)
+				server.clients = append(server.clients, nil)
+
+				common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
+					server.clients[idx] = NewClassicNameServer(dest, d, server.clientIP)
+				}))
+			}
+		}
+		server.ipIndexMap = append(server.ipIndexMap, nil)
+		return len(server.clients) - 1
+	}
+
+	if len(config.NameServers) > 0 {
+		features.PrintDeprecatedFeatureWarning("simple DNS server")
+		for _, destPB := range config.NameServers {
+			addNameServer(&NameServer{Address: destPB})
+		}
+	}
+
+	if len(config.NameServer) > 0 {
+		clientIndices := []int{}
+		domainRuleCount := 0
+		for _, ns := range config.NameServer {
+			idx := addNameServer(ns)
+			clientIndices = append(clientIndices, idx)
+			domainRuleCount += len(ns.PrioritizedDomain)
+		}
+
+		domainRules := make([][]string, len(server.clients))
+		domainMatcher := &strmatcher.MatcherGroup{}
+		matcherInfos := make([]DomainMatcherInfo, domainRuleCount+1) // matcher index starts from 1
+		var geoIPMatcherContainer router.GeoIPMatcherContainer
+		for nidx, ns := range config.NameServer {
+			idx := clientIndices[nidx]
+
+			// Establish domain rule matcher
+			rules := []string{}
+			ruleCurr := 0
+			ruleIter := 0
+			for _, domain := range ns.PrioritizedDomain {
+				matcher, err := toStrMatcher(domain.Type, domain.Domain)
+				if err != nil {
+					return nil, newError("failed to create prioritized domain").Base(err).AtWarning()
+				}
+				midx := domainMatcher.Add(matcher)
+				if midx >= uint32(len(matcherInfos)) { // This rarely happens according to current matcher's implementation
+					newError("expanding domain matcher info array to size ", midx, " when adding ", matcher).AtDebug().WriteToLog()
+					matcherInfos = append(matcherInfos, make([]DomainMatcherInfo, midx-uint32(len(matcherInfos))+1)...)
+				}
+				info := &matcherInfos[midx]
+				info.clientIdx = uint16(idx)
+				if ruleCurr < len(ns.OriginalRules) {
+					info.domainRuleIdx = uint16(ruleCurr)
+					rule := ns.OriginalRules[ruleCurr]
+					if ruleCurr >= len(rules) {
+						rules = append(rules, rule.Rule)
+					}
+					ruleIter++
+					if ruleIter >= int(rule.Size) {
+						ruleIter = 0
+						ruleCurr++
+					}
+				} else { // No original rule, generate one according to current domain matcher (majorly for compatibility with tests)
+					info.domainRuleIdx = uint16(len(rules))
+					rules = append(rules, matcher.String())
+				}
+			}
+			domainRules[idx] = rules
+
+			// only add to ipIndexMap if GeoIP is configured
+			if len(ns.Geoip) > 0 {
+				var matchers []*router.GeoIPMatcher
+				for _, geoip := range ns.Geoip {
+					matcher, err := geoIPMatcherContainer.Add(geoip)
+					if err != nil {
+						return nil, newError("failed to create ip matcher").Base(err).AtWarning()
+					}
+					matchers = append(matchers, matcher)
+				}
+				matcher := &MultiGeoIPMatcher{matchers: matchers}
+				server.ipIndexMap[idx] = matcher
+			}
+		}
+		server.domainRules = domainRules
+		server.domainMatcher = domainMatcher
+		server.matcherInfos = matcherInfos
+	}
+
+	if len(server.clients) == 0 {
+		server.clients = append(server.clients, NewLocalNameServer())
+		server.ipIndexMap = append(server.ipIndexMap, nil)
+	}
+
+	return server, nil
+}
+
+// Type implements common.HasType.
+func (*Server) Type() interface{} {
+	return dns.ClientType()
+}
+
+// Start implements common.Runnable.
+func (s *Server) Start() error {
+	return nil
+}
+
+// Close implements common.Closable.
+func (s *Server) Close() error {
+	return nil
+}
+
+func (s *Server) IsOwnLink(ctx context.Context) bool {
+	inbound := session.InboundFromContext(ctx)
+	return inbound != nil && inbound.Tag == s.tag
+}
+
+// Match check dns ip match geoip
+func (s *Server) Match(idx int, client Client, domain string, ips []net.IP) ([]net.IP, error) {
+	var matcher *MultiGeoIPMatcher
+	if idx < len(s.ipIndexMap) {
+		matcher = s.ipIndexMap[idx]
+	}
+	if matcher == nil {
+		return ips, nil
+	}
+
+	if !matcher.HasMatcher() {
+		newError("domain ", domain, " server has no valid matcher: ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
+		return ips, nil
+	}
+
+	newIps := []net.IP{}
+	for _, ip := range ips {
+		if matcher.Match(ip) {
+			newIps = append(newIps, ip)
+		}
+	}
+	if len(newIps) == 0 {
+		return nil, errExpectedIPNonMatch
+	}
+	newError("domain ", domain, " expectIPs ", newIps, " matched at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
+	return newIps, nil
+}
+
+func (s *Server) queryIPTimeout(idx int, client Client, domain string, option dns.IPOption) ([]net.IP, error) {
+	ctx, cancel := context.WithTimeout(s.ctx, time.Second*4)
+	if len(s.tag) > 0 {
+		ctx = session.ContextWithInbound(ctx, &session.Inbound{
+			Tag: s.tag,
+		})
+	}
+	ctx = internet.ContextWithLookupDomain(ctx, domain)
+	ips, err := client.QueryIP(ctx, domain, option)
+	cancel()
+
+	if err != nil {
+		return ips, err
+	}
+
+	ips, err = s.Match(idx, client, domain, ips)
+	return ips, err
+}
+
+func (s *Server) lookupStatic(domain string, option dns.IPOption, depth int32) []net.Address {
+	ips := s.hosts.LookupIP(domain, option)
+	if ips == nil {
+		return nil
+	}
+	if ips[0].Family().IsDomain() && depth < 5 {
+		if newIPs := s.lookupStatic(ips[0].Domain(), option, depth+1); newIPs != nil {
+			return newIPs
+		}
+	}
+	return ips
+}
+
+func toNetIP(ips []net.Address) []net.IP {
+	if len(ips) == 0 {
+		return nil
+	}
+	netips := make([]net.IP, 0, len(ips))
+	for _, ip := range ips {
+		netips = append(netips, ip.IP())
+	}
+	return netips
+}
+
+// LookupIP implements dns.Client.
+func (s *Server) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
+	if domain == "" {
+		return nil, newError("empty domain name")
+	}
+
+	// normalize the FQDN form query
+	if strings.HasSuffix(domain, ".") {
+		domain = domain[:len(domain)-1]
+	}
+
+	ips := s.lookupStatic(domain, option, 0)
+	if ips != nil && ips[0].Family().IsIP() {
+		newError("returning ", len(ips), " IPs for domain ", domain).WriteToLog()
+		return toNetIP(ips), nil
+	}
+
+	if ips != nil && ips[0].Family().IsDomain() {
+		newdomain := ips[0].Domain()
+		newError("domain replaced: ", domain, " -> ", newdomain).WriteToLog()
+		domain = newdomain
+	}
+
+	var lastErr error
+	var matchedClient Client
+	if s.domainMatcher != nil {
+		indices := s.domainMatcher.Match(domain)
+		domainRules := []string{}
+		matchingDNS := []string{}
+		for _, idx := range indices {
+			info := s.matcherInfos[idx]
+			rule := s.domainRules[info.clientIdx][info.domainRuleIdx]
+			domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", rule, info.clientIdx))
+			matchingDNS = append(matchingDNS, s.clients[info.clientIdx].Name())
+		}
+		if len(domainRules) > 0 {
+			newError("domain ", domain, " matches following rules: ", domainRules).AtDebug().WriteToLog()
+		}
+		if len(matchingDNS) > 0 {
+			newError("domain ", domain, " uses following DNS first: ", matchingDNS).AtDebug().WriteToLog()
+		}
+		for _, idx := range indices {
+			clientIdx := int(s.matcherInfos[idx].clientIdx)
+			matchedClient = s.clients[clientIdx]
+			if !option.FakeEnable && strings.EqualFold(matchedClient.Name(), "FakeDNS") {
+				newError("skip DNS resolution for domain ", domain, " at server ", matchedClient.Name()).AtDebug().WriteToLog()
+				continue
+			}
+			ips, err := s.queryIPTimeout(clientIdx, matchedClient, domain, option)
+			if len(ips) > 0 {
+				return ips, nil
+			}
+			if err == dns.ErrEmptyResponse {
+				return nil, err
+			}
+			if err != nil {
+				newError("failed to lookup ip for domain ", domain, " at server ", matchedClient.Name()).Base(err).WriteToLog()
+				lastErr = err
+			}
+		}
+	}
+
+	for idx, client := range s.clients {
+		if client == matchedClient {
+			newError("domain ", domain, " at server ", client.Name(), " idx:", idx, " already lookup failed, just ignore").AtDebug().WriteToLog()
+			continue
+		}
+		if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
+			newError("skip DNS resolution for domain ", domain, " at server ", client.Name()).AtDebug().WriteToLog()
+			continue
+		}
+		ips, err := s.queryIPTimeout(idx, client, domain, option)
+		if len(ips) > 0 {
+			return ips, nil
+		}
+
+		if err != nil {
+			newError("failed to lookup ip for domain ", domain, " at server ", client.Name()).Base(err).WriteToLog()
+			lastErr = err
+		}
+		if err != context.Canceled && err != context.DeadlineExceeded && err != errExpectedIPNonMatch {
+			return nil, err
+		}
+	}
+
+	return nil, newError("returning nil for domain ", domain).Base(lastErr)
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return New(ctx, config.(*Config))
+	}))
+}

app/dns/server_test.go

@@ -154,7 +154,11 @@ func TestUDPServerSubnet(t *testing.T) {
 
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
 
-	ips, err := client.LookupIP("google.com")
+	ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	})
 	if err != nil {
 		t.Fatal("unexpected error: ", err)
 	}
@@ -209,7 +213,11 @@ func TestUDPServer(t *testing.T) {
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -220,7 +228,11 @@ func TestUDPServer(t *testing.T) {
 	}
 
 	{
-		ips, err := client.LookupIP("facebook.com")
+		ips, err := client.LookupIP("facebook.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -231,7 +243,11 @@ func TestUDPServer(t *testing.T) {
 	}
 
 	{
-		_, err := client.LookupIP("notexist.google.com")
+		_, err := client.LookupIP("notexist.google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err == nil {
 			t.Fatal("nil error")
 		}
@@ -241,8 +257,11 @@ func TestUDPServer(t *testing.T) {
 	}
 
 	{
-		clientv6 := client.(feature_dns.IPv6Lookup)
+		ips, err := client.LookupIP("ipv4only.google.com", feature_dns.IPOption{
-		ips, err := clientv6.LookupIPv6("ipv4only.google.com")
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != feature_dns.ErrEmptyResponse {
 			t.Fatal("error: ", err)
 		}
@@ -254,7 +273,11 @@ func TestUDPServer(t *testing.T) {
 	dnsServer.Shutdown()
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -331,7 +354,11 @@ func TestPrioritizedDomain(t *testing.T) {
 	startTime := time.Now()
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -390,9 +417,12 @@ func TestUDPServerIPv6(t *testing.T) {
 	common.Must(err)
 
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
-	client6 := client.(feature_dns.IPv6Lookup)
 	{
-		ips, err := client6.LookupIPv6("ipv6.google.com")
+		ips, err := client.LookupIP("ipv6.google.com", feature_dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -455,7 +485,11 @@ func TestStaticHostDomain(t *testing.T) {
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
 
 	{
-		ips, err := client.LookupIP("example.com")
+		ips, err := client.LookupIP("example.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -562,7 +596,11 @@ func TestIPMatch(t *testing.T) {
 	startTime := time.Now()
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -681,7 +719,11 @@ func TestLocalDomain(t *testing.T) {
 	startTime := time.Now()
 
 	{ // Will match dotless:
-		ips, err := client.LookupIP("hostname")
+		ips, err := client.LookupIP("hostname", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -692,7 +734,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match domain:local
-		ips, err := client.LookupIP("hostname.local")
+		ips, err := client.LookupIP("hostname.local", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -703,7 +749,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match static ip
-		ips, err := client.LookupIP("hostnamestatic")
+		ips, err := client.LookupIP("hostnamestatic", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -714,7 +764,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match domain replacing
-		ips, err := client.LookupIP("hostnamealias")
+		ips, err := client.LookupIP("hostnamealias", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -725,7 +779,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:localhost, but not expectIPs: 127.0.0.2, 127.0.0.3, then matches at dotless:
-		ips, err := client.LookupIP("localhost")
+		ips, err := client.LookupIP("localhost", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -736,7 +794,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:localhost, and expectIPs: 127.0.0.2, 127.0.0.3
-		ips, err := client.LookupIP("localhost-a")
+		ips, err := client.LookupIP("localhost-a", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -747,7 +809,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:localhost, and expectIPs: 127.0.0.2, 127.0.0.3
-		ips, err := client.LookupIP("localhost-b")
+		ips, err := client.LookupIP("localhost-b", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -758,7 +824,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:
-		ips, err := client.LookupIP("Mijia Cloud")
+		ips, err := client.LookupIP("Mijia Cloud", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -920,7 +990,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	startTime := time.Now()
 
 	{ // Will match server 1,2 and server 1 returns expected ip
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -931,8 +1005,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	}
 
 	{ // Will match server 1,2 and server 1 returns unexpected ip, then server 2 returns expected one
-		clientv4 := client.(feature_dns.IPv4Lookup)
+		ips, err := client.LookupIP("ipv6.google.com", feature_dns.IPOption{
-		ips, err := clientv4.LookupIPv4("ipv6.google.com")
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -943,7 +1020,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	}
 
 	{ // Will match server 3,1,2 and server 3 returns expected one
-		ips, err := client.LookupIP("api.google.com")
+		ips, err := client.LookupIP("api.google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -954,7 +1035,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	}
 
 	{ // Will match server 4,3,1,2 and server 4 returns expected one
-		ips, err := client.LookupIP("v2.api.google.com")
+		ips, err := client.LookupIP("v2.api.google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}

app/dns/udpns.go

@@ -2,6 +2,7 @@ package dns
 
 import (
 	"context"
+	"github.com/xtls/xray-core/transport/internet"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -31,10 +32,10 @@ type ClassicNameServer struct {
 	udpServer *udp.Dispatcher
 	cleanup   *task.Periodic
 	reqID     uint32
+	clientIP  net.IP
 }
 
-// NewClassicNameServer creates udp server object for remote resolving.
+func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher, clientIP net.IP) *ClassicNameServer {
-func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher) *ClassicNameServer {
 	// default to 53 if unspecific
 	if address.Port == 0 {
 		address.Port = net.Port(53)
@@ -44,6 +45,7 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
 		address:  address,
 		ips:      make(map[string]record),
 		requests: make(map[uint16]dnsRequest),
+		clientIP: clientIP,
 		pub:      pubsub.NewService(),
 		name:     strings.ToUpper(address.String()),
 	}
@@ -56,12 +58,10 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
 	return s
 }
 
-// Name implements Server.
 func (s *ClassicNameServer) Name() string {
 	return s.name
 }
 
-// Cleanup clears expired items from cache
 func (s *ClassicNameServer) Cleanup() error {
 	now := time.Now()
 	s.Lock()
@@ -103,7 +103,6 @@ func (s *ClassicNameServer) Cleanup() error {
 	return nil
 }
 
-// HandleResponse handles udp response packet from remote DNS server.
 func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_proto.Packet) {
 	ipRec, err := parseResponse(packet.Payload.Bytes())
 	if err != nil {
@@ -181,10 +180,10 @@ func (s *ClassicNameServer) addPendingRequest(req *dnsRequest) {
 	s.requests[id] = *req
 }
 
-func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption) {
+func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, option dns_feature.IPOption) {
 	newError(s.name, " querying DNS for: ", domain).AtDebug().WriteToLog(session.ExportIDToError(ctx))
 
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
+	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP))
 
 	for _, req := range reqs {
 		s.addPendingRequest(req)
@@ -193,6 +192,7 @@ func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, client
 		if inbound := session.InboundFromContext(ctx); inbound != nil {
 			udpCtx = session.ContextWithInbound(udpCtx, inbound)
 		}
+		udpCtx = internet.ContextWithLookupDomain(udpCtx, internet.LookupDomainFromContext(ctx))
 		udpCtx = session.ContextWithContent(udpCtx, &session.Content{
 			Protocol: "dns",
 		})
@@ -234,7 +234,7 @@ func (s *ClassicNameServer) findIPsForDomain(domain string, option dns_feature.I
 	}
 
 	if len(ips) > 0 {
-		return toNetIP(ips)
+		return toNetIP(ips), nil
 	}
 
 	if lastErr != nil {
@@ -245,21 +245,15 @@ func (s *ClassicNameServer) findIPsForDomain(domain string, option dns_feature.I
 }
 
 // QueryIP implements Server.
-func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, cs CacheStrategy) ([]net.IP, error) {
+func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, error) {
 	fqdn := Fqdn(domain)
 
-	if cs == CacheStrategy_Cache_DISABLE {
-		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
-	} else {
 	ips, err := s.findIPsForDomain(fqdn, option)
 	if err != errRecordNotFound {
-			if cs == CacheStrategy_Cache_NOERROR && err == nil {
 		newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
 		log.Record(&log.DNSLog{s.name, domain, ips, log.DNSCacheHit, 0, err})
 		return ips, err
 	}
-		}
-	}
 
 	// ipv4 and ipv6 belong to different subscription groups
 	var sub4, sub6 *pubsub.Subscriber
@@ -287,7 +281,7 @@ func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, clientIP
 		}
 		close(done)
 	}()
-	s.sendQuery(ctx, fqdn, clientIP, option)
+	s.sendQuery(ctx, fqdn, option)
 	start := time.Now()
 
 	for {

app/router/command/config.go

@@ -28,12 +28,6 @@ func (c routingContext) GetTargetPort() net.Port {
 	return net.Port(c.RoutingContext.GetTargetPort())
 }
 
-// GetSkipDNSResolve is a mock implementation here to match the interface,
-// SkipDNSResolve is set from dns module, no use if coming from a protobuf object?
-func (c routingContext) GetSkipDNSResolve() bool {
-	return false
-}
-
 // AsRoutingContext converts a protobuf RoutingContext into an implementation of routing.Context.
 func AsRoutingContext(r *RoutingContext) routing.Context {
 	return routingContext{r}

app/router/condition.go

@@ -66,6 +66,24 @@ type DomainMatcher struct {
 	matchers strmatcher.IndexMatcher
 }
 
+func NewMphMatcherGroup(domains []*Domain) (*DomainMatcher, error) {
+	g := strmatcher.NewMphMatcherGroup()
+	for _, d := range domains {
+		matcherType, f := matcherTypeMap[d.Type]
+		if !f {
+			return nil, newError("unsupported domain type", d.Type)
+		}
+		_, err := g.AddPattern(d.Value, matcherType)
+		if err != nil {
+			return nil, err
+		}
+	}
+	g.Build()
+	return &DomainMatcher{
+		matchers: g,
+	}, nil
+}
+
 func NewDomainMatcher(domains []*Domain) (*DomainMatcher, error) {
 	g := new(strmatcher.MatcherGroup)
 	for _, d := range domains {
@@ -82,7 +100,7 @@ func NewDomainMatcher(domains []*Domain) (*DomainMatcher, error) {
 }
 
 func (m *DomainMatcher) ApplyDomain(domain string) bool {
-	return len(m.matchers.Match(domain)) > 0
+	return len(m.matchers.Match(strings.ToLower(domain))) > 0
 }
 
 // Apply implements Condition.
@@ -91,7 +109,7 @@ func (m *DomainMatcher) Apply(ctx routing.Context) bool {
 	if len(domain) == 0 {
 		return false
 	}
-	return m.ApplyDomain(strings.ToLower(domain))
+	return m.ApplyDomain(domain)
 }
 
 type MultiGeoIPMatcher struct {

app/router/condition_test.go

@@ -359,6 +359,9 @@ func TestChinaSites(t *testing.T) {
 	matcher, err := NewDomainMatcher(domains)
 	common.Must(err)
 
+	acMatcher, err := NewMphMatcherGroup(domains)
+	common.Must(err)
+
 	type TestCase struct {
 		Domain string
 		Output bool
@@ -387,9 +390,96 @@ func TestChinaSites(t *testing.T) {
 	}
 
 	for _, testCase := range testCases {
-		r := matcher.ApplyDomain(testCase.Domain)
+		r1 := matcher.ApplyDomain(testCase.Domain)
-		if r != testCase.Output {
+		r2 := acMatcher.ApplyDomain(testCase.Domain)
-			t.Error("expected output ", testCase.Output, " for domain ", testCase.Domain, " but got ", r)
+		if r1 != testCase.Output {
+			t.Error("DomainMatcher expected output ", testCase.Output, " for domain ", testCase.Domain, " but got ", r1)
+		} else if r2 != testCase.Output {
+			t.Error("ACDomainMatcher expected output ", testCase.Output, " for domain ", testCase.Domain, " but got ", r2)
+		}
+	}
+}
+
+func BenchmarkMphDomainMatcher(b *testing.B) {
+	domains, err := loadGeoSite("CN")
+	common.Must(err)
+
+	matcher, err := NewMphMatcherGroup(domains)
+	common.Must(err)
+
+	type TestCase struct {
+		Domain string
+		Output bool
+	}
+	testCases := []TestCase{
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+	}
+
+	for i := 0; i < 1024; i++ {
+		testCases = append(testCases, TestCase{Domain: strconv.Itoa(i) + ".not-exists.com", Output: false})
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for _, testCase := range testCases {
+			_ = matcher.ApplyDomain(testCase.Domain)
+		}
+	}
+}
+
+func BenchmarkDomainMatcher(b *testing.B) {
+	domains, err := loadGeoSite("CN")
+	common.Must(err)
+
+	matcher, err := NewDomainMatcher(domains)
+	common.Must(err)
+
+	type TestCase struct {
+		Domain string
+		Output bool
+	}
+	testCases := []TestCase{
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+	}
+
+	for i := 0; i < 1024; i++ {
+		testCases = append(testCases, TestCase{Domain: strconv.Itoa(i) + ".not-exists.com", Output: false})
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for _, testCase := range testCases {
+			_ = matcher.ApplyDomain(testCase.Domain)
 		}
 	}
 }

app/router/config.go

@@ -67,11 +67,24 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	conds := NewConditionChan()
 
 	if len(rr.Domain) > 0 {
+		switch rr.DomainMatcher {
+		case "linear":
 			matcher, err := NewDomainMatcher(rr.Domain)
 			if err != nil {
 				return nil, newError("failed to build domain condition").Base(err)
 			}
 			conds.Add(matcher)
+		case "mph", "hybrid":
+			fallthrough
+		default:
+			matcher, err := NewMphMatcherGroup(rr.Domain)
+			if err != nil {
+				return nil, newError("failed to build domain condition with MphDomainMatcher").Base(err)
+			}
+			newError("MphDomainMatcher is enabled for ", len(rr.Domain), " domain rule(s)").AtDebug().WriteToLog()
+			conds.Add(matcher)
+		}
+
 	}
 
 	if len(rr.UserEmail) > 0 {

app/router/config.pb.go

@@ -1,13 +1,12 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.26.0
-// 	protoc        v3.14.0
+// 	protoc        v3.15.8
 // source: app/router/config.proto
 
 package router
 
 import (
-	proto "github.com/golang/protobuf/proto"
 	net "github.com/xtls/xray-core/common/net"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -22,10 +21,6 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
 // Type of domain value.
 type Domain_Type int32
 
@@ -515,6 +510,7 @@ type RoutingRule struct {
 	InboundTag     []string      `protobuf:"bytes,8,rep,name=inbound_tag,json=inboundTag,proto3" json:"inbound_tag,omitempty"`
 	Protocol       []string      `protobuf:"bytes,9,rep,name=protocol,proto3" json:"protocol,omitempty"`
 	Attributes     string        `protobuf:"bytes,15,opt,name=attributes,proto3" json:"attributes,omitempty"`
+	DomainMatcher  string        `protobuf:"bytes,17,opt,name=domain_matcher,json=domainMatcher,proto3" json:"domain_matcher,omitempty"`
 }
 
 func (x *RoutingRule) Reset() {
@@ -672,6 +668,13 @@ func (x *RoutingRule) GetAttributes() string {
 	return ""
 }
 
+func (x *RoutingRule) GetDomainMatcher() string {
+	if x != nil {
+		return x.DomainMatcher
+	}
+	return ""
+}
+
 type isRoutingRule_TargetTag interface {
 	isRoutingRule_TargetTag()
 }
@@ -946,7 +949,7 @@ var file_app_router_config_proto_rawDesc = []byte{
 	0x74, 0x12, 0x2e, 0x0a, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b,
 	0x32, 0x18, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74,
 	0x65, 0x72, 0x2e, 0x47, 0x65, 0x6f, 0x53, 0x69, 0x74, 0x65, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72,
-	0x79, 0x22, 0x8e, 0x06, 0x0a, 0x0b, 0x52, 0x6f, 0x75, 0x74, 0x69, 0x6e, 0x67, 0x52, 0x75, 0x6c,
+	0x79, 0x22, 0xb5, 0x06, 0x0a, 0x0b, 0x52, 0x6f, 0x75, 0x74, 0x69, 0x6e, 0x67, 0x52, 0x75, 0x6c,
 	0x65, 0x12, 0x12, 0x0a, 0x03, 0x74, 0x61, 0x67, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x48, 0x00,
 	0x52, 0x03, 0x74, 0x61, 0x67, 0x12, 0x25, 0x0a, 0x0d, 0x62, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69,
 	0x6e, 0x67, 0x5f, 0x74, 0x61, 0x67, 0x18, 0x0c, 0x20, 0x01, 0x28, 0x09, 0x48, 0x00, 0x52, 0x0c,
@@ -994,36 +997,38 @@ var file_app_router_config_proto_rawDesc = []byte{
 	0x6f, 0x63, 0x6f, 0x6c, 0x18, 0x09, 0x20, 0x03, 0x28, 0x09, 0x52, 0x08, 0x70, 0x72, 0x6f, 0x74,
 	0x6f, 0x63, 0x6f, 0x6c, 0x12, 0x1e, 0x0a, 0x0a, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74,
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+	0x75, 0x74, 0x65, 0x73, 0x12, 0x25, 0x0a, 0x0e, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x5f, 0x6d,
-	0x61, 0x67, 0x22, 0x4e, 0x0a, 0x0d, 0x42, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69, 0x6e, 0x67, 0x52,
+	0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x18, 0x11, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0d, 0x64, 0x6f,
-	0x75, 0x6c, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x74, 0x61, 0x67, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
+	0x6d, 0x61, 0x69, 0x6e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x42, 0x0c, 0x0a, 0x0a, 0x74,
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+	0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c,
-	0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f,
+	0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0xaa, 0x02, 0x0f, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70,
+	0x70, 0x2e, 0x52, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

app/router/config.proto

@@ -119,6 +119,8 @@ message RoutingRule {
   repeated string protocol = 9;
 
   string attributes = 15;
+
+  string domain_matcher = 17;
 }
 
 message BalancingRule {

app/router/router.go

@@ -80,13 +80,7 @@ func (r *Router) PickRoute(ctx routing.Context) (routing.Route, error) {
 }
 
 func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context, error) {
-
+	if r.domainStrategy == Config_IpOnDemand {
-	// SkipDNSResolve is set from DNS module.
-	// the DOH remote server maybe a domain name,
-	// this prevents cycle resolving dead loop
-	skipDNSResolve := ctx.GetSkipDNSResolve()
-
-	if r.domainStrategy == Config_IpOnDemand && !skipDNSResolve {
 		ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
 	}
 
@@ -96,7 +90,7 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 		}
 	}
 
-	if r.domainStrategy != Config_IpIfNonMatch || len(ctx.GetTargetDomain()) == 0 || skipDNSResolve {
+	if r.domainStrategy != Config_IpIfNonMatch || len(ctx.GetTargetDomain()) == 0 {
 		return nil, ctx, common.ErrNoClue
 	}
 

app/router/router_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/outbound"
 	routing_session "github.com/xtls/xray-core/features/routing/session"
 	"github.com/xtls/xray-core/testing/mocks"
@@ -115,7 +116,11 @@ func TestIPOnDemand(t *testing.T) {
 	defer mockCtl.Finish()
 
 	mockDNS := mocks.NewDNSClient(mockCtl)
-	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com")).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
+	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com"), dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
 	common.Must(r.Init(config, mockDNS, nil))
@@ -150,7 +155,11 @@ func TestIPIfNonMatchDomain(t *testing.T) {
 	defer mockCtl.Finish()
 
 	mockDNS := mocks.NewDNSClient(mockCtl)
-	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com")).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
+	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com"), dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
 	common.Must(r.Init(config, mockDNS, nil))

common/protocol/tls/sniff.go

@@ -102,7 +102,7 @@ func ReadClientHello(data []byte, h *SniffHeader) error {
 					return errNotClientHello
 				}
 				if nameType == 0 {
-					serverName := strings.ToLower(string(d[:nameLen]))
+					serverName := string(d[:nameLen])
 					// An SNI value may not include a
 					// trailing dot. See
 					// https://tools.ietf.org/html/rfc6066#section-3.

common/session/session.go

@@ -75,7 +75,7 @@ type Content struct {
 
 	Attributes map[string]string
 
-	SkipDNSResolve bool
+	SkipRoutePick bool
 }
 
 // Sockopt is the settings for socket connection.

common/strmatcher/ac_automaton_matcher.go

@@ -0,0 +1,243 @@
+package strmatcher
+
+import (
+	"container/list"
+)
+
+const validCharCount = 53
+
+type MatchType struct {
+	matchType Type
+	exist     bool
+}
+
+const (
+	TrieEdge bool = true
+	FailEdge bool = false
+)
+
+type Edge struct {
+	edgeType bool
+	nextNode int
+}
+
+type ACAutomaton struct {
+	trie   [][validCharCount]Edge
+	fail   []int
+	exists []MatchType
+	count  int
+}
+
+func newNode() [validCharCount]Edge {
+	var s [validCharCount]Edge
+	for i := range s {
+		s[i] = Edge{
+			edgeType: FailEdge,
+			nextNode: 0,
+		}
+	}
+	return s
+}
+
+var char2Index = []int{
+	'A':  0,
+	'a':  0,
+	'B':  1,
+	'b':  1,
+	'C':  2,
+	'c':  2,
+	'D':  3,
+	'd':  3,
+	'E':  4,
+	'e':  4,
+	'F':  5,
+	'f':  5,
+	'G':  6,
+	'g':  6,
+	'H':  7,
+	'h':  7,
+	'I':  8,
+	'i':  8,
+	'J':  9,
+	'j':  9,
+	'K':  10,
+	'k':  10,
+	'L':  11,
+	'l':  11,
+	'M':  12,
+	'm':  12,
+	'N':  13,
+	'n':  13,
+	'O':  14,
+	'o':  14,
+	'P':  15,
+	'p':  15,
+	'Q':  16,
+	'q':  16,
+	'R':  17,
+	'r':  17,
+	'S':  18,
+	's':  18,
+	'T':  19,
+	't':  19,
+	'U':  20,
+	'u':  20,
+	'V':  21,
+	'v':  21,
+	'W':  22,
+	'w':  22,
+	'X':  23,
+	'x':  23,
+	'Y':  24,
+	'y':  24,
+	'Z':  25,
+	'z':  25,
+	'!':  26,
+	'$':  27,
+	'&':  28,
+	'\'': 29,
+	'(':  30,
+	')':  31,
+	'*':  32,
+	'+':  33,
+	',':  34,
+	';':  35,
+	'=':  36,
+	':':  37,
+	'%':  38,
+	'-':  39,
+	'.':  40,
+	'_':  41,
+	'~':  42,
+	'0':  43,
+	'1':  44,
+	'2':  45,
+	'3':  46,
+	'4':  47,
+	'5':  48,
+	'6':  49,
+	'7':  50,
+	'8':  51,
+	'9':  52,
+}
+
+func NewACAutomaton() *ACAutomaton {
+	var ac = new(ACAutomaton)
+	ac.trie = append(ac.trie, newNode())
+	ac.fail = append(ac.fail, 0)
+	ac.exists = append(ac.exists, MatchType{
+		matchType: Full,
+		exist:     false,
+	})
+	return ac
+}
+
+func (ac *ACAutomaton) Add(domain string, t Type) {
+	var node = 0
+	for i := len(domain) - 1; i >= 0; i-- {
+		var idx = char2Index[domain[i]]
+		if ac.trie[node][idx].nextNode == 0 {
+			ac.count++
+			if len(ac.trie) < ac.count+1 {
+				ac.trie = append(ac.trie, newNode())
+				ac.fail = append(ac.fail, 0)
+				ac.exists = append(ac.exists, MatchType{
+					matchType: Full,
+					exist:     false,
+				})
+			}
+			ac.trie[node][idx] = Edge{
+				edgeType: TrieEdge,
+				nextNode: ac.count,
+			}
+		}
+		node = ac.trie[node][idx].nextNode
+	}
+	ac.exists[node] = MatchType{
+		matchType: t,
+		exist:     true,
+	}
+	switch t {
+	case Domain:
+		ac.exists[node] = MatchType{
+			matchType: Full,
+			exist:     true,
+		}
+		var idx = char2Index['.']
+		if ac.trie[node][idx].nextNode == 0 {
+			ac.count++
+			if len(ac.trie) < ac.count+1 {
+				ac.trie = append(ac.trie, newNode())
+				ac.fail = append(ac.fail, 0)
+				ac.exists = append(ac.exists, MatchType{
+					matchType: Full,
+					exist:     false,
+				})
+			}
+			ac.trie[node][idx] = Edge{
+				edgeType: TrieEdge,
+				nextNode: ac.count,
+			}
+		}
+		node = ac.trie[node][idx].nextNode
+		ac.exists[node] = MatchType{
+			matchType: t,
+			exist:     true,
+		}
+	default:
+		break
+	}
+}
+
+func (ac *ACAutomaton) Build() {
+	var queue = list.New()
+	for i := 0; i < validCharCount; i++ {
+		if ac.trie[0][i].nextNode != 0 {
+			queue.PushBack(ac.trie[0][i])
+		}
+	}
+	for {
+		var front = queue.Front()
+		if front == nil {
+			break
+		} else {
+			var node = front.Value.(Edge).nextNode
+			queue.Remove(front)
+			for i := 0; i < validCharCount; i++ {
+				if ac.trie[node][i].nextNode != 0 {
+					ac.fail[ac.trie[node][i].nextNode] = ac.trie[ac.fail[node]][i].nextNode
+					queue.PushBack(ac.trie[node][i])
+				} else {
+					ac.trie[node][i] = Edge{
+						edgeType: FailEdge,
+						nextNode: ac.trie[ac.fail[node]][i].nextNode,
+					}
+				}
+			}
+		}
+	}
+}
+
+func (ac *ACAutomaton) Match(s string) bool {
+	var node = 0
+	var fullMatch = true
+	// 1. the match string is all through trie edge. FULL MATCH or DOMAIN
+	// 2. the match string is through a fail edge. NOT FULL MATCH
+	// 2.1 Through a fail edge, but there exists a valid node. SUBSTR
+	for i := len(s) - 1; i >= 0; i-- {
+		var idx = char2Index[s[i]]
+		fullMatch = fullMatch && ac.trie[node][idx].edgeType
+		node = ac.trie[node][idx].nextNode
+		switch ac.exists[node].matchType {
+		case Substr:
+			return true
+		case Domain:
+			if fullMatch {
+				return true
+			}
+		default:
+			break
+		}
+	}
+	return fullMatch && ac.exists[node].exist
+}

common/strmatcher/benchmark_test.go

@@ -8,6 +8,19 @@ import (
 	. "github.com/xtls/xray-core/common/strmatcher"
 )
 
+func BenchmarkACAutomaton(b *testing.B) {
+	ac := NewACAutomaton()
+	for i := 1; i <= 1024; i++ {
+		ac.Add(strconv.Itoa(i)+".v2ray.com", Domain)
+	}
+	ac.Build()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = ac.Match("0.v2ray.com")
+	}
+}
+
 func BenchmarkDomainMatcherGroup(b *testing.B) {
 	g := new(DomainMatcherGroup)
 

common/strmatcher/mph_matcher.go

@@ -0,0 +1,301 @@
+package strmatcher
+
+import (
+	"math/bits"
+	"regexp"
+	"sort"
+	"strings"
+	"unsafe"
+)
+
+// PrimeRK is the prime base used in Rabin-Karp algorithm.
+const PrimeRK = 16777619
+
+// calculate the rolling murmurHash of given string
+func RollingHash(s string) uint32 {
+	h := uint32(0)
+	for i := len(s) - 1; i >= 0; i-- {
+		h = h*PrimeRK + uint32(s[i])
+	}
+	return h
+}
+
+// A MphMatcherGroup is divided into three parts:
+// 1. `full` and `domain` patterns are matched by Rabin-Karp algorithm and minimal perfect hash table;
+// 2. `substr` patterns are matched by ac automaton;
+// 3. `regex` patterns are matched with the regex library.
+type MphMatcherGroup struct {
+	ac            *ACAutomaton
+	otherMatchers []matcherEntry
+	rules         []string
+	level0        []uint32
+	level0Mask    int
+	level1        []uint32
+	level1Mask    int
+	count         uint32
+	ruleMap       *map[string]uint32
+}
+
+func (g *MphMatcherGroup) AddFullOrDomainPattern(pattern string, t Type) {
+	h := RollingHash(pattern)
+	switch t {
+	case Domain:
+		(*g.ruleMap)["."+pattern] = h*PrimeRK + uint32('.')
+		fallthrough
+	case Full:
+		(*g.ruleMap)[pattern] = h
+	default:
+	}
+}
+
+func NewMphMatcherGroup() *MphMatcherGroup {
+	return &MphMatcherGroup{
+		ac:            nil,
+		otherMatchers: nil,
+		rules:         nil,
+		level0:        nil,
+		level0Mask:    0,
+		level1:        nil,
+		level1Mask:    0,
+		count:         1,
+		ruleMap:       &map[string]uint32{},
+	}
+}
+
+// AddPattern adds a pattern to MphMatcherGroup
+func (g *MphMatcherGroup) AddPattern(pattern string, t Type) (uint32, error) {
+	switch t {
+	case Substr:
+		if g.ac == nil {
+			g.ac = NewACAutomaton()
+		}
+		g.ac.Add(pattern, t)
+	case Full, Domain:
+		pattern = strings.ToLower(pattern)
+		g.AddFullOrDomainPattern(pattern, t)
+	case Regex:
+		r, err := regexp.Compile(pattern)
+		if err != nil {
+			return 0, err
+		}
+		g.otherMatchers = append(g.otherMatchers, matcherEntry{
+			m:  &regexMatcher{pattern: r},
+			id: g.count,
+		})
+	default:
+		panic("Unknown type")
+	}
+	return g.count, nil
+}
+
+// Build builds a minimal perfect hash table and ac automaton from insert rules
+func (g *MphMatcherGroup) Build() {
+	if g.ac != nil {
+		g.ac.Build()
+	}
+	keyLen := len(*g.ruleMap)
+	if keyLen == 0 {
+		keyLen = 1
+		(*g.ruleMap)["empty___"] = RollingHash("empty___")
+	}
+	g.level0 = make([]uint32, nextPow2(keyLen/4))
+	g.level0Mask = len(g.level0) - 1
+	g.level1 = make([]uint32, nextPow2(keyLen))
+	g.level1Mask = len(g.level1) - 1
+	var sparseBuckets = make([][]int, len(g.level0))
+	var ruleIdx int
+	for rule, hash := range *g.ruleMap {
+		n := int(hash) & g.level0Mask
+		g.rules = append(g.rules, rule)
+		sparseBuckets[n] = append(sparseBuckets[n], ruleIdx)
+		ruleIdx++
+	}
+	g.ruleMap = nil
+	var buckets []indexBucket
+	for n, vals := range sparseBuckets {
+		if len(vals) > 0 {
+			buckets = append(buckets, indexBucket{n, vals})
+		}
+	}
+	sort.Sort(bySize(buckets))
+
+	occ := make([]bool, len(g.level1))
+	var tmpOcc []int
+	for _, bucket := range buckets {
+		var seed = uint32(0)
+		for {
+			findSeed := true
+			tmpOcc = tmpOcc[:0]
+			for _, i := range bucket.vals {
+				n := int(strhashFallback(unsafe.Pointer(&g.rules[i]), uintptr(seed))) & g.level1Mask
+				if occ[n] {
+					for _, n := range tmpOcc {
+						occ[n] = false
+					}
+					seed++
+					findSeed = false
+					break
+				}
+				occ[n] = true
+				tmpOcc = append(tmpOcc, n)
+				g.level1[n] = uint32(i)
+			}
+			if findSeed {
+				g.level0[bucket.n] = seed
+				break
+			}
+		}
+	}
+}
+
+func nextPow2(v int) int {
+	if v <= 1 {
+		return 1
+	}
+	const MaxUInt = ^uint(0)
+	n := (MaxUInt >> bits.LeadingZeros(uint(v))) + 1
+	return int(n)
+}
+
+// Lookup searches for s in t and returns its index and whether it was found.
+func (g *MphMatcherGroup) Lookup(h uint32, s string) bool {
+	i0 := int(h) & g.level0Mask
+	seed := g.level0[i0]
+	i1 := int(strhashFallback(unsafe.Pointer(&s), uintptr(seed))) & g.level1Mask
+	n := g.level1[i1]
+	return s == g.rules[int(n)]
+}
+
+// Match implements IndexMatcher.Match.
+func (g *MphMatcherGroup) Match(pattern string) []uint32 {
+	result := []uint32{}
+	hash := uint32(0)
+	for i := len(pattern) - 1; i >= 0; i-- {
+		hash = hash*PrimeRK + uint32(pattern[i])
+		if pattern[i] == '.' {
+			if g.Lookup(hash, pattern[i:]) {
+				result = append(result, 1)
+				return result
+			}
+		}
+	}
+	if g.Lookup(hash, pattern) {
+		result = append(result, 1)
+		return result
+	}
+	if g.ac != nil && g.ac.Match(pattern) {
+		result = append(result, 1)
+		return result
+	}
+	for _, e := range g.otherMatchers {
+		if e.m.Match(pattern) {
+			result = append(result, e.id)
+			return result
+		}
+	}
+	return nil
+}
+
+type indexBucket struct {
+	n    int
+	vals []int
+}
+
+type bySize []indexBucket
+
+func (s bySize) Len() int           { return len(s) }
+func (s bySize) Less(i, j int) bool { return len(s[i].vals) > len(s[j].vals) }
+func (s bySize) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+
+type stringStruct struct {
+	str unsafe.Pointer
+	len int
+}
+
+func strhashFallback(a unsafe.Pointer, h uintptr) uintptr {
+	x := (*stringStruct)(a)
+	return memhashFallback(x.str, h, uintptr(x.len))
+}
+
+const (
+	// Constants for multiplication: four random odd 64-bit numbers.
+	m1 = 16877499708836156737
+	m2 = 2820277070424839065
+	m3 = 9497967016996688599
+	m4 = 15839092249703872147
+)
+
+var hashkey = [4]uintptr{1, 1, 1, 1}
+
+func memhashFallback(p unsafe.Pointer, seed, s uintptr) uintptr {
+	h := uint64(seed + s*hashkey[0])
+tail:
+	switch {
+	case s == 0:
+	case s < 4:
+		h ^= uint64(*(*byte)(p))
+		h ^= uint64(*(*byte)(add(p, s>>1))) << 8
+		h ^= uint64(*(*byte)(add(p, s-1))) << 16
+		h = rotl31(h*m1) * m2
+	case s <= 8:
+		h ^= uint64(readUnaligned32(p))
+		h ^= uint64(readUnaligned32(add(p, s-4))) << 32
+		h = rotl31(h*m1) * m2
+	case s <= 16:
+		h ^= readUnaligned64(p)
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, s-8))
+		h = rotl31(h*m1) * m2
+	case s <= 32:
+		h ^= readUnaligned64(p)
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, 8))
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, s-16))
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, s-8))
+		h = rotl31(h*m1) * m2
+	default:
+		v1 := h
+		v2 := uint64(seed * hashkey[1])
+		v3 := uint64(seed * hashkey[2])
+		v4 := uint64(seed * hashkey[3])
+		for s >= 32 {
+			v1 ^= readUnaligned64(p)
+			v1 = rotl31(v1*m1) * m2
+			p = add(p, 8)
+			v2 ^= readUnaligned64(p)
+			v2 = rotl31(v2*m2) * m3
+			p = add(p, 8)
+			v3 ^= readUnaligned64(p)
+			v3 = rotl31(v3*m3) * m4
+			p = add(p, 8)
+			v4 ^= readUnaligned64(p)
+			v4 = rotl31(v4*m4) * m1
+			p = add(p, 8)
+			s -= 32
+		}
+		h = v1 ^ v2 ^ v3 ^ v4
+		goto tail
+	}
+
+	h ^= h >> 29
+	h *= m3
+	h ^= h >> 32
+	return uintptr(h)
+}
+func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
+	return unsafe.Pointer(uintptr(p) + x)
+}
+func readUnaligned32(p unsafe.Pointer) uint32 {
+	q := (*[4]byte)(p)
+	return uint32(q[0]) | uint32(q[1])<<8 | uint32(q[2])<<16 | uint32(q[3])<<24
+}
+
+func rotl31(x uint64) uint64 {
+	return (x << 31) | (x >> (64 - 31))
+}
+func readUnaligned64(p unsafe.Pointer) uint64 {
+	q := (*[8]byte)(p)
+	return uint64(q[0]) | uint64(q[1])<<8 | uint64(q[2])<<16 | uint64(q[3])<<24 | uint64(q[4])<<32 | uint64(q[5])<<40 | uint64(q[6])<<48 | uint64(q[7])<<56
+}

common/strmatcher/strmatcher.go

@@ -27,6 +27,7 @@ const (
 
 // New creates a new Matcher based on the given pattern.
 func (t Type) New(pattern string) (Matcher, error) {
+	// 1. regex matching is case-sensitive
 	switch t {
 	case Full:
 		return fullMatcher(pattern), nil

common/strmatcher/strmatcher_test.go

@@ -91,3 +91,172 @@ func TestMatcherGroup(t *testing.T) {
 		}
 	}
 }
+
+func TestACAutomaton(t *testing.T) {
+	cases1 := []struct {
+		pattern string
+		mType   Type
+		input   string
+		output  bool
+	}{
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "www.xtls.github.io",
+			output:  true,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "xtls.github.io",
+			output:  true,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "www.xtis.github.io",
+			output:  false,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "tls.github.io",
+			output:  false,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "xxtls.github.io",
+			output:  false,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Full,
+			input:   "xtls.github.io",
+			output:  true,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Full,
+			input:   "xxtls.github.io",
+			output:  false,
+		},
+	}
+	for _, test := range cases1 {
+		var ac = NewACAutomaton()
+		ac.Add(test.pattern, test.mType)
+		ac.Build()
+		if m := ac.Match(test.input); m != test.output {
+			t.Error("unexpected output: ", m, " for test case ", test)
+		}
+	}
+	{
+		cases2Input := []struct {
+			pattern string
+			mType   Type
+		}{
+			{
+				pattern: "163.com",
+				mType:   Domain,
+			},
+			{
+				pattern: "m.126.com",
+				mType:   Full,
+			},
+			{
+				pattern: "3.com",
+				mType:   Full,
+			},
+			{
+				pattern: "google.com",
+				mType:   Substr,
+			},
+			{
+				pattern: "vgoogle.com",
+				mType:   Substr,
+			},
+		}
+		var ac = NewACAutomaton()
+		for _, test := range cases2Input {
+			ac.Add(test.pattern, test.mType)
+		}
+		ac.Build()
+		cases2Output := []struct {
+			pattern string
+			res     bool
+		}{
+			{
+				pattern: "126.com",
+				res:     false,
+			},
+			{
+				pattern: "m.163.com",
+				res:     true,
+			},
+			{
+				pattern: "mm163.com",
+				res:     false,
+			},
+			{
+				pattern: "m.126.com",
+				res:     true,
+			},
+			{
+				pattern: "163.com",
+				res:     true,
+			},
+			{
+				pattern: "63.com",
+				res:     false,
+			},
+			{
+				pattern: "oogle.com",
+				res:     false,
+			},
+			{
+				pattern: "vvgoogle.com",
+				res:     true,
+			},
+		}
+		for _, test := range cases2Output {
+			if m := ac.Match(test.pattern); m != test.res {
+				t.Error("unexpected output: ", m, " for test case ", test)
+			}
+		}
+	}
+
+	{
+		cases3Input := []struct {
+			pattern string
+			mType   Type
+		}{
+			{
+				pattern: "video.google.com",
+				mType:   Domain,
+			},
+			{
+				pattern: "gle.com",
+				mType:   Domain,
+			},
+		}
+		var ac = NewACAutomaton()
+		for _, test := range cases3Input {
+			ac.Add(test.pattern, test.mType)
+		}
+		ac.Build()
+		cases3Output := []struct {
+			pattern string
+			res     bool
+		}{
+			{
+				pattern: "google.com",
+				res:     false,
+			},
+		}
+		for _, test := range cases3Output {
+			if m := ac.Match(test.pattern); m != test.res {
+				t.Error("unexpected output: ", m, " for test case ", test)
+			}
+		}
+	}
+}

features/dns/client.go

@@ -14,12 +14,6 @@ type IPOption struct {
 	FakeEnable bool
 }
 
-func (p *IPOption) Copy() *IPOption {
-	return &IPOption{p.IPv4Enable, p.IPv6Enable, p.FakeEnable}
-}
-
-type Option func(dopt *IPOption) *IPOption
-
 // Client is a Xray feature for querying DNS information.
 //
 // xray:api:stable
@@ -27,24 +21,7 @@ type Client interface {
 	features.Feature
 
 	// LookupIP returns IP address for the given domain. IPs may contain IPv4 and/or IPv6 addresses.
-	LookupIP(domain string) ([]net.IP, error)
+	LookupIP(domain string, option IPOption) ([]net.IP, error)
-
-	// LookupOptions query IP address for domain with *IPOption.
-	LookupOptions(domain string, opt ...Option) ([]net.IP, error)
-}
-
-// IPv4Lookup is an optional feature for querying IPv4 addresses only.
-//
-// xray:api:beta
-type IPv4Lookup interface {
-	LookupIPv4(domain string) ([]net.IP, error)
-}
-
-// IPv6Lookup is an optional feature for querying IPv6 addresses only.
-//
-// xray:api:beta
-type IPv6Lookup interface {
-	LookupIPv6(domain string) ([]net.IP, error)
 }
 
 // ClientType returns the type of Client interface. Can be used for implementing common.HasType.
@@ -73,35 +50,3 @@ func RCodeFromError(err error) uint16 {
 	}
 	return 0
 }
-
-var (
-	LookupIPv4Only = func(d *IPOption) *IPOption {
-		d.IPv4Enable = true
-		d.IPv6Enable = false
-		return d
-	}
-	LookupIPv6Only = func(d *IPOption) *IPOption {
-		d.IPv4Enable = false
-		d.IPv6Enable = true
-		return d
-	}
-	LookupIP = func(d *IPOption) *IPOption {
-		d.IPv4Enable = true
-		d.IPv6Enable = true
-		return d
-	}
-	LookupFake = func(d *IPOption) *IPOption {
-		d.FakeEnable = true
-		return d
-	}
-	LookupNoFake = func(d *IPOption) *IPOption {
-		d.FakeEnable = false
-		return d
-	}
-
-	LookupAll = func(d *IPOption) *IPOption {
-		LookupIP(d)
-		LookupFake(d)
-		return d
-	}
-)

features/dns/localdns/client.go

@@ -20,65 +20,42 @@ func (*Client) Start() error { return nil }
 func (*Client) Close() error { return nil }
 
 // LookupIP implements Client.
-func (*Client) LookupIP(host string) ([]net.IP, error) {
+func (*Client) LookupIP(host string, option dns.IPOption) ([]net.IP, error) {
 	ips, err := net.LookupIP(host)
 	if err != nil {
 		return nil, err
 	}
 	parsedIPs := make([]net.IP, 0, len(ips))
+	ipv4 := make([]net.IP, 0, len(ips))
+	ipv6 := make([]net.IP, 0, len(ips))
 	for _, ip := range ips {
 		parsed := net.IPAddress(ip)
 		if parsed != nil {
 			parsedIPs = append(parsedIPs, parsed.IP())
 		}
-	}
-	if len(parsedIPs) == 0 {
-		return nil, dns.ErrEmptyResponse
-	}
-	return parsedIPs, nil
-}
-
-// LookupOptions implements Client.
-func (c *Client) LookupOptions(host string, _ ...dns.Option) ([]net.IP, error) {
-	return c.LookupIP(host)
-}
-
-// LookupIPv4 implements IPv4Lookup.
-func (c *Client) LookupIPv4(host string) ([]net.IP, error) {
-	ips, err := c.LookupIP(host)
-	if err != nil {
-		return nil, err
-	}
-	ipv4 := make([]net.IP, 0, len(ips))
-	for _, ip := range ips {
 		if len(ip) == net.IPv4len {
 			ipv4 = append(ipv4, ip)
 		}
-	}
-	if len(ipv4) == 0 {
-		return nil, dns.ErrEmptyResponse
-	}
-	return ipv4, nil
-}
-
-// LookupIPv6 implements IPv6Lookup.
-func (c *Client) LookupIPv6(host string) ([]net.IP, error) {
-	ips, err := c.LookupIP(host)
-	if err != nil {
-		return nil, err
-	}
-	ipv6 := make([]net.IP, 0, len(ips))
-	for _, ip := range ips {
 		if len(ip) == net.IPv6len {
 			ipv6 = append(ipv6, ip)
 		}
 	}
-	if len(ipv6) == 0 {
+	switch {
-		return nil, dns.ErrEmptyResponse
+	case option.IPv4Enable && option.IPv6Enable:
+		if len(parsedIPs) > 0 {
+			return parsedIPs, nil
 		}
-
+	case option.IPv4Enable:
+		if len(ipv4) > 0 {
+			return ipv4, nil
+		}
+	case option.IPv6Enable:
+		if len(ipv6) > 0 {
 			return ipv6, nil
 		}
+	}
+	return nil, dns.ErrEmptyResponse
+}
 
 // New create a new dns.Client that queries localhost for DNS.
 func New() *Client {

features/routing/context.go

@@ -37,7 +37,4 @@ type Context interface {
 
 	// GetAttributes returns extra attributes from the conneciont content.
 	GetAttributes() map[string]string
-
-	// GetSkipDNSResolve returns a flag switch for weather skip dns resolve during route pick.
-	GetSkipDNSResolve() bool
 }

features/routing/dns/context.go

@@ -26,12 +26,16 @@ func (ctx *ResolvableContext) GetTargetIPs() []net.IP {
 	}
 
 	if domain := ctx.GetTargetDomain(); len(domain) != 0 {
-		ips, err := ctx.dnsClient.LookupIP(domain)
+		ips, err := ctx.dnsClient.LookupIP(domain, dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err == nil {
 			ctx.resolvedIPs = ips
 			return ips
 		}
-		newError("failed to resolve ip for ", domain).Base(err).WriteToLog()
+		newError("resolve ip for ", domain).Base(err).WriteToLog()
 	}
 
 	return nil

features/routing/session/context.go

@@ -109,14 +109,6 @@ func (ctx *Context) GetAttributes() map[string]string {
 	return ctx.Content.Attributes
 }
 
-// GetSkipDNSResolve implements routing.Context.
-func (ctx *Context) GetSkipDNSResolve() bool {
-	if ctx.Content == nil {
-		return false
-	}
-	return ctx.Content.SkipDNSResolve
-}
-
 // AsRoutingContext creates a context from context.context with session info.
 func AsRoutingContext(ctx context.Context) routing.Context {
 	return &Context{

infra/conf/dns.go

@@ -12,9 +12,7 @@ import (
 
 type NameServerConfig struct {
 	Address   *Address
-	ClientIP     *Address
 	Port      uint16
-	SkipFallback bool
 	Domains   []string
 	ExpectIPs StringList
 }
@@ -28,17 +26,13 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 
 	var advanced struct {
 		Address   *Address   `json:"address"`
-		ClientIP     *Address   `json:"clientIp"`
 		Port      uint16     `json:"port"`
-		SkipFallback bool       `json:"skipFallback"`
 		Domains   []string   `json:"domains"`
 		ExpectIPs StringList `json:"expectIps"`
 	}
 	if err := json.Unmarshal(data, &advanced); err == nil {
 		c.Address = advanced.Address
-		c.ClientIP = advanced.ClientIP
 		c.Port = advanced.Port
-		c.SkipFallback = advanced.SkipFallback
 		c.Domains = advanced.Domains
 		c.ExpectIPs = advanced.ExpectIPs
 		return nil
@@ -93,21 +87,12 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 		return nil, newError("invalid IP rule: ", c.ExpectIPs).Base(err)
 	}
 
-	var myClientIP []byte
-	if c.ClientIP != nil {
-		if !c.ClientIP.Family().IsIP() {
-			return nil, newError("not an IP address:", c.ClientIP.String())
-		}
-		myClientIP = []byte(c.ClientIP.IP())
-	}
 	return &dns.NameServer{
 		Address: &net.Endpoint{
 			Network: net.Network_UDP,
 			Address: c.Address.Build(),
 			Port:    uint32(c.Port),
 		},
-		ClientIp:          myClientIP,
-		SkipFallback:      c.SkipFallback,
 		PrioritizedDomain: domains,
 		Geoip:             geoipList,
 		OriginalRules:     originalRules,
@@ -124,71 +109,27 @@ var typeMap = map[router.Domain_Type]dns.DomainMatchingType{
 // DNSConfig is a JSON serializable object for dns.Config.
 type DNSConfig struct {
 	Servers  []*NameServerConfig `json:"servers"`
-	Hosts           map[string]*HostAddress `json:"hosts"`
+	Hosts    map[string]*Address `json:"hosts"`
 	ClientIP *Address            `json:"clientIp"`
 	Tag      string              `json:"tag"`
-	QueryStrategy   string                  `json:"queryStrategy"`
-	CacheStrategy   string                  `json:"cacheStrategy"`
-	DisableCache    bool                    `json:"disableCache"`
-	DisableFallback bool                    `json:"disableFallback"`
 }
 
-type HostAddress struct {
+func getHostMapping(addr *Address) *dns.Config_HostMapping {
-	addr  *Address
+	if addr.Family().IsIP() {
-	addrs []*Address
-}
-
-// UnmarshalJSON implements encoding/json.Unmarshaler.UnmarshalJSON
-func (h *HostAddress) UnmarshalJSON(data []byte) error {
-	addr := new(Address)
-	var addrs []*Address
-	switch {
-	case json.Unmarshal(data, &addr) == nil:
-		h.addr = addr
-	case json.Unmarshal(data, &addrs) == nil:
-		h.addrs = addrs
-	default:
-		return newError("invalid address")
-	}
-	return nil
-}
-
-func getHostMapping(ha *HostAddress) *dns.Config_HostMapping {
-	if ha.addr != nil {
-		if ha.addr.Family().IsDomain() {
 		return &dns.Config_HostMapping{
-				ProxiedDomain: ha.addr.Domain(),
+			Ip: [][]byte{[]byte(addr.IP())},
 		}
-		}
+	} else {
-		return &dns.Config_HostMapping{
-			Ip: [][]byte{ha.addr.IP()},
-		}
-	}
-
-	ips := make([][]byte, 0, len(ha.addrs))
-	for _, addr := range ha.addrs {
-		if addr.Family().IsDomain() {
 		return &dns.Config_HostMapping{
 			ProxiedDomain: addr.Domain(),
 		}
 	}
-		ips = append(ips, []byte(addr.IP()))
-	}
-	return &dns.Config_HostMapping{
-		Ip: ips,
-	}
 }
 
 // Build implements Buildable
 func (c *DNSConfig) Build() (*dns.Config, error) {
 	config := &dns.Config{
 		Tag: c.Tag,
-		CacheStrategy:   dns.CacheStrategy_Cache_ALL,
-		DisableFallback: c.DisableFallback,
-	}
-
-	if c.DisableCache {
-		config.CacheStrategy = dns.CacheStrategy_Cache_DISABLE
 	}
 
 	if c.ClientIP != nil {
@@ -198,25 +139,6 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
 		config.ClientIp = []byte(c.ClientIP.IP())
 	}
 
-	config.QueryStrategy = dns.QueryStrategy_USE_IP
-	switch strings.ToLower(c.QueryStrategy) {
-	case "useip", "use_ip", "use-ip":
-		config.QueryStrategy = dns.QueryStrategy_USE_IP
-	case "useip4", "useipv4", "use_ip4", "use_ipv4", "use_ip_v4", "use-ip4", "use-ipv4", "use-ip-v4":
-		config.QueryStrategy = dns.QueryStrategy_USE_IP4
-	case "useip6", "useipv6", "use_ip6", "use_ipv6", "use_ip_v6", "use-ip6", "use-ipv6", "use-ip-v6":
-		config.QueryStrategy = dns.QueryStrategy_USE_IP6
-	}
-
-	switch strings.ToLower(c.CacheStrategy) {
-	case "noerror":
-		config.CacheStrategy = dns.CacheStrategy_Cache_NOERROR
-	case "all":
-		config.CacheStrategy = dns.CacheStrategy_Cache_ALL
-	case "disable", "none":
-		config.CacheStrategy = dns.CacheStrategy_Cache_DISABLE
-	}
-
 	for _, server := range c.Servers {
 		ns, err := server.Build()
 		if err != nil {

infra/conf/dns_test.go

@@ -67,23 +67,17 @@ func TestDNSConfigParsing(t *testing.T) {
 			Input: `{
 				"servers": [{
 					"address": "8.8.8.8",
-					"clientIp": "10.0.0.1",
 					"port": 5353,
-					"skipFallback": true,
 					"domains": ["domain:example.com"]
 				}],
 				"hosts": {
 					"example.com": "127.0.0.1",
-					"xtls.github.io": ["1.2.3.4", "5.6.7.8"],
 					"domain:example.com": "google.com",
-					"geosite:test": ["127.0.0.1", "127.0.0.2"],
+					"geosite:test": "10.0.0.1",
-					"keyword:google": ["8.8.8.8", "8.8.4.4"],
+					"keyword:google": "8.8.8.8",
 					"regexp:.*\\.com": "8.8.4.4"
 				},
-				"clientIp": "10.0.0.1",
+				"clientIp": "10.0.0.1"
-				"queryStrategy": "UseIPv4",
-				"cacheStrategy": "disable",
-				"disableFallback": true
 			}`,
 			Parser: parserCreator(),
 			Output: &dns.Config{
@@ -98,8 +92,6 @@ func TestDNSConfigParsing(t *testing.T) {
 							Network: net.Network_UDP,
 							Port:    5353,
 						},
-						ClientIp:     []byte{10, 0, 0, 1},
-						SkipFallback: true,
 						PrioritizedDomain: []*dns.NameServer_PriorityDomain{
 							{
 								Type:   dns.DomainMatchingType_Subdomain,
@@ -128,28 +120,20 @@ func TestDNSConfigParsing(t *testing.T) {
 					{
 						Type:   dns.DomainMatchingType_Full,
 						Domain: "example.com",
-						Ip:     [][]byte{{127, 0, 0, 1}, {127, 0, 0, 2}},
+						Ip:     [][]byte{{10, 0, 0, 1}},
 					},
 					{
 						Type:   dns.DomainMatchingType_Keyword,
 						Domain: "google",
-						Ip:     [][]byte{{8, 8, 8, 8}, {8, 8, 4, 4}},
+						Ip:     [][]byte{{8, 8, 8, 8}},
 					},
 					{
 						Type:   dns.DomainMatchingType_Regex,
 						Domain: ".*\\.com",
 						Ip:     [][]byte{{8, 8, 4, 4}},
 					},
-					{
-						Type:   dns.DomainMatchingType_Full,
-						Domain: "xtls.github.io",
-						Ip:     [][]byte{{1, 2, 3, 4}, {5, 6, 7, 8}},
-					},
 				},
 				ClientIp: []byte{10, 0, 0, 1},
-				QueryStrategy:   dns.QueryStrategy_USE_IP4,
-				CacheStrategy:   dns.CacheStrategy_Cache_DISABLE,
-				DisableFallback: true,
 			},
 		},
 	})

infra/conf/freedom.go

@@ -22,11 +22,11 @@ func (c *FreedomConfig) Build() (proto.Message, error) {
 	config := new(freedom.Config)
 	config.DomainStrategy = freedom.Config_AS_IS
 	switch strings.ToLower(c.DomainStrategy) {
-	case "useip", "use_ip", "use-ip":
+	case "useip", "use_ip":
 		config.DomainStrategy = freedom.Config_USE_IP
-	case "useip4", "useipv4", "use_ip4", "use_ipv4", "use_ip_v4", "use-ip4", "use-ipv4", "use-ip-v4":
+	case "useip4", "useipv4", "use_ipv4", "use_ip_v4", "use_ip4":
 		config.DomainStrategy = freedom.Config_USE_IP4
-	case "useip6", "useipv6", "use_ip6", "use_ipv6", "use_ip_v6", "use-ip6", "use-ipv6", "use-ip-v6":
+	case "useip6", "useipv6", "use_ipv6", "use_ip_v6", "use_ip6":
 		config.DomainStrategy = freedom.Config_USE_IP6
 	}
 

infra/conf/loopback.go

@@ -1,14 +0,0 @@
-package conf
-
-import (
-	"github.com/golang/protobuf/proto"
-	"github.com/xtls/xray-core/proxy/loopback"
-)
-
-type LoopbackConfig struct {
-	InboundTag string `json:"inboundTag"`
-}
-
-func (l LoopbackConfig) Build() (proto.Message, error) {
-	return &loopback.Config{InboundTag: l.InboundTag}, nil
-}

infra/conf/router.go

@@ -98,6 +98,8 @@ type RouterRule struct {
 	Type        string `json:"type"`
 	OutboundTag string `json:"outboundTag"`
 	BalancerTag string `json:"balancerTag"`
+
+	DomainMatcher string `json:"domainMatcher"`
 }
 
 func ParseIP(s string) (*router.CIDR, error) {
@@ -491,6 +493,10 @@ func parseFieldRule(msg json.RawMessage) (*router.RoutingRule, error) {
 		return nil, newError("neither outboundTag nor balancerTag is specified in routing rule")
 	}
 
+	if rawFieldRule.DomainMatcher != "" {
+		rule.DomainMatcher = rawFieldRule.DomainMatcher
+	}
+
 	if rawFieldRule.Domain != nil {
 		for _, domain := range *rawFieldRule.Domain {
 			rules, err := parseDomainRule(domain)

infra/conf/xray.go

@@ -2,12 +2,11 @@ package conf
 
 import (
 	"encoding/json"
+	"github.com/xtls/xray-core/transport/internet"
 	"log"
 	"os"
 	"strings"
 
-	"github.com/xtls/xray-core/transport/internet"
-
 	"github.com/xtls/xray-core/app/dispatcher"
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/app/stats"
@@ -39,7 +38,6 @@ var (
 		"trojan":      func() interface{} { return new(TrojanClientConfig) },
 		"mtproto":     func() interface{} { return new(MTProtoClientConfig) },
 		"dns":         func() interface{} { return new(DNSOutboundConfig) },
-		"loopback":    func() interface{} { return new(LoopbackConfig) },
 	}, "protocol", "settings")
 
 	ctllog = log.New(os.Stderr, "xctl> ", 0)

proxy/dns/dns.go

@@ -43,7 +43,6 @@ type Handler struct {
 
 func (h *Handler) Init(config *Config, dnsClient dns.Client) error {
 	h.client = dnsClient
-
 	if v, ok := dnsClient.(ownLinkVerifier); ok {
 		h.ownLinkVerifier = v
 	}
@@ -199,16 +198,22 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
 	var err error
 
 	var ttl uint32 = 600
-	var opt dns.Option
 
 	switch qType {
 	case dnsmessage.TypeA:
-		opt = dns.LookupIPv4Only
+		ips, err = h.client.LookupIP(domain, dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: true,
+		})
 	case dnsmessage.TypeAAAA:
-		opt = dns.LookupIPv6Only
+		ips, err = h.client.LookupIP(domain, dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: true,
+		})
 	}
 
-	ips, err = h.client.LookupOptions(domain, opt, dns.LookupFake)
 	rcode := dns.RCodeFromError(err)
 	if rcode == 0 && len(ips) == 0 && err != dns.ErrEmptyResponse {
 		newError("ip query").Base(err).WriteToLog()
@@ -223,6 +228,7 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
 		RecursionAvailable: true,
 		RecursionDesired:   true,
 		Response:           true,
+		Authoritative:      true,
 	})
 	builder.EnableCompression()
 	common.Must(builder.StartQuestions())

proxy/freedom/freedom.go

@@ -59,14 +59,26 @@ func (h *Handler) policy() policy.Session {
 }
 
 func (h *Handler) resolveIP(ctx context.Context, domain string, localAddr net.Address) net.Address {
-	var opt dns.Option
+	var option dns.IPOption = dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	}
 	if h.config.DomainStrategy == Config_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()) {
-		opt = dns.LookupIPv4Only
+		option = dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: false,
+		}
 	} else if h.config.DomainStrategy == Config_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()) {
-		opt = dns.LookupIPv6Only
+		option = dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		}
 	}
 
-	ips, err := h.dns.LookupOptions(domain, opt, dns.LookupNoFake)
+	ips, err := h.dns.LookupIP(domain, option)
 	if err != nil {
 		newError("failed to get IP address for domain ", domain).Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}

proxy/loopback/config.pb.go

@@ -1,149 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.15.8
-// source: proxy/loopback/config.proto
-
-package loopback
-
-import (
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	reflect "reflect"
-	sync "sync"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-type Config struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	InboundTag string `protobuf:"bytes,1,opt,name=inbound_tag,json=inboundTag,proto3" json:"inbound_tag,omitempty"`
-}
-
-func (x *Config) Reset() {
-	*x = Config{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proxy_loopback_config_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Config) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Config) ProtoMessage() {}
-
-func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_proxy_loopback_config_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Config.ProtoReflect.Descriptor instead.
-func (*Config) Descriptor() ([]byte, []int) {
-	return file_proxy_loopback_config_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Config) GetInboundTag() string {
-	if x != nil {
-		return x.InboundTag
-	}
-	return ""
-}
-
-var File_proxy_loopback_config_proto protoreflect.FileDescriptor
-
-var file_proxy_loopback_config_proto_rawDesc = []byte{
-	0x0a, 0x1b, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2f, 0x6c, 0x6f, 0x6f, 0x70, 0x62, 0x61, 0x63, 0x6b,
-	0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x13, 0x78,
-	0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x62, 0x61,
-	0x63, 0x6b, 0x22, 0x29, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x1f, 0x0a, 0x0b,
-	0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x5f, 0x74, 0x61, 0x67, 0x18, 0x01, 0x20, 0x01, 0x28,
-	0x09, 0x52, 0x0a, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x54, 0x61, 0x67, 0x42, 0x5b, 0x0a,
-	0x17, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e,
-	0x6c, 0x6f, 0x6f, 0x70, 0x62, 0x61, 0x63, 0x6b, 0x50, 0x01, 0x5a, 0x28, 0x67, 0x69, 0x74, 0x68,
-	0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79,
-	0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2f, 0x6c, 0x6f, 0x6f, 0x70,
-	0x62, 0x61, 0x63, 0x6b, 0xaa, 0x02, 0x13, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x78,
-	0x79, 0x2e, 0x4c, 0x6f, 0x6f, 0x70, 0x62, 0x61, 0x63, 0x6b, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
-	0x6f, 0x33,
-}
-
-var (
-	file_proxy_loopback_config_proto_rawDescOnce sync.Once
-	file_proxy_loopback_config_proto_rawDescData = file_proxy_loopback_config_proto_rawDesc
-)
-
-func file_proxy_loopback_config_proto_rawDescGZIP() []byte {
-	file_proxy_loopback_config_proto_rawDescOnce.Do(func() {
-		file_proxy_loopback_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_proxy_loopback_config_proto_rawDescData)
-	})
-	return file_proxy_loopback_config_proto_rawDescData
-}
-
-var file_proxy_loopback_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_proxy_loopback_config_proto_goTypes = []interface{}{
-	(*Config)(nil), // 0: xray.proxy.loopback.Config
-}
-var file_proxy_loopback_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_proxy_loopback_config_proto_init() }
-func file_proxy_loopback_config_proto_init() {
-	if File_proxy_loopback_config_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_proxy_loopback_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Config); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_proxy_loopback_config_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_proxy_loopback_config_proto_goTypes,
-		DependencyIndexes: file_proxy_loopback_config_proto_depIdxs,
-		MessageInfos:      file_proxy_loopback_config_proto_msgTypes,
-	}.Build()
-	File_proxy_loopback_config_proto = out.File
-	file_proxy_loopback_config_proto_rawDesc = nil
-	file_proxy_loopback_config_proto_goTypes = nil
-	file_proxy_loopback_config_proto_depIdxs = nil
-}

proxy/loopback/config.proto

@@ -1,11 +0,0 @@
-syntax = "proto3";
-
-package xray.proxy.loopback;
-option csharp_namespace = "Xray.Proxy.Loopback";
-option go_package = "github.com/xtls/xray-core/proxy/loopback";
-option java_package = "com.xray.proxy.loopback";
-option java_multiple_files = true;
-
-message Config {
-  string inbound_tag = 1;
-}

proxy/loopback/errors.generated.go

@@ -1,9 +0,0 @@
-package loopback
-
-import "github.com/xtls/xray-core/common/errors"
-
-type errPathObjHolder struct{}
-
-func newError(values ...interface{}) *errors.Error {
-	return errors.New(values...).WithPathObj(errPathObjHolder{})
-}

proxy/loopback/lookback.go

@@ -1,121 +0,0 @@
-package loopback
-
-import (
-	"context"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/net/cnc"
-	"github.com/xtls/xray-core/common/retry"
-	"github.com/xtls/xray-core/common/session"
-	"github.com/xtls/xray-core/common/task"
-	core "github.com/xtls/xray-core/core"
-	"github.com/xtls/xray-core/features/routing"
-	"github.com/xtls/xray-core/transport"
-	"github.com/xtls/xray-core/transport/internet"
-)
-
-type Loopback struct {
-	config             *Config
-	dispatcherInstance routing.Dispatcher
-}
-
-func (l *Loopback) Process(ctx context.Context, link *transport.Link, _ internet.Dialer) error {
-	outbound := session.OutboundFromContext(ctx)
-	if outbound == nil || !outbound.Target.IsValid() {
-		return newError("target not specified.")
-	}
-	destination := outbound.Target
-
-	newError("opening connection to ", destination).WriteToLog(session.ExportIDToError(ctx))
-
-	input := link.Reader
-	output := link.Writer
-
-	var conn internet.Connection
-	err := retry.ExponentialBackoff(5, 100).On(func() error {
-		dialDest := destination
-
-		content := new(session.Content)
-		content.SkipDNSResolve = true
-
-		ctx = session.ContextWithContent(ctx, content)
-
-		inbound := session.InboundFromContext(ctx)
-
-		inbound.Tag = l.config.InboundTag
-
-		ctx = session.ContextWithInbound(ctx, inbound)
-
-		rawConn, err := l.dispatcherInstance.Dispatch(ctx, dialDest)
-		if err != nil {
-			return err
-		}
-
-		var readerOpt cnc.ConnectionOption
-		if dialDest.Network == net.Network_TCP {
-			readerOpt = cnc.ConnectionOutputMulti(rawConn.Reader)
-		} else {
-			readerOpt = cnc.ConnectionOutputMultiUDP(rawConn.Reader)
-		}
-
-		conn = cnc.NewConnection(cnc.ConnectionInputMulti(rawConn.Writer), readerOpt)
-		return nil
-	})
-	if err != nil {
-		return newError("failed to open connection to ", destination).Base(err)
-	}
-	defer conn.Close()
-
-	requestDone := func() error {
-		var writer buf.Writer
-		if destination.Network == net.Network_TCP {
-			writer = buf.NewWriter(conn)
-		} else {
-			writer = &buf.SequentialWriter{Writer: conn}
-		}
-
-		if err := buf.Copy(input, writer); err != nil {
-			return newError("failed to process request").Base(err)
-		}
-
-		return nil
-	}
-
-	responseDone := func() error {
-		var reader buf.Reader
-		if destination.Network == net.Network_TCP {
-			reader = buf.NewReader(conn)
-		} else {
-			reader = buf.NewPacketReader(conn)
-		}
-		if err := buf.Copy(reader, output); err != nil {
-			return newError("failed to process response").Base(err)
-		}
-
-		return nil
-	}
-
-	if err := task.Run(ctx, requestDone, task.OnSuccess(responseDone, task.Close(output))); err != nil {
-		return newError("connection ends").Base(err)
-	}
-
-	return nil
-}
-
-func (l *Loopback) init(config *Config, dispatcherInstance routing.Dispatcher) error {
-	l.dispatcherInstance = dispatcherInstance
-	l.config = config
-	return nil
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
-		l := new(Loopback)
-		err := core.RequireFeatures(ctx, func(dispatcherInstance routing.Dispatcher) error {
-			return l.init(config.(*Config), dispatcherInstance)
-		})
-		return l, err
-	}))
-}

proxy/loopback/loopback.go

@@ -1,3 +0,0 @@
-package loopback
-
-//go:generate go run github.com/xray/xray-core/common/errors/errorgen

testing/mocks/dns.go

@@ -5,37 +5,36 @@
 package mocks
 
 import (
-	net "net"
-	reflect "reflect"
-
 	gomock "github.com/golang/mock/gomock"
 	dns "github.com/xtls/xray-core/features/dns"
+	net "net"
+	reflect "reflect"
 )
 
-// DNSClient is a mock of Client interface.
+// DNSClient is a mock of Client interface
 type DNSClient struct {
 	ctrl     *gomock.Controller
 	recorder *DNSClientMockRecorder
 }
 
-// DNSClientMockRecorder is the mock recorder for DNSClient.
+// DNSClientMockRecorder is the mock recorder for DNSClient
 type DNSClientMockRecorder struct {
 	mock *DNSClient
 }
 
-// NewDNSClient creates a new mock instance.
+// NewDNSClient creates a new mock instance
 func NewDNSClient(ctrl *gomock.Controller) *DNSClient {
 	mock := &DNSClient{ctrl: ctrl}
 	mock.recorder = &DNSClientMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *DNSClient) EXPECT() *DNSClientMockRecorder {
 	return m.recorder
 }
 
-// Close mocks base method.
+// Close mocks base method
 func (m *DNSClient) Close() error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Close")
@@ -43,48 +42,28 @@ func (m *DNSClient) Close() error {
 	return ret0
 }
 
-// Close indicates an expected call of Close.
+// Close indicates an expected call of Close
 func (mr *DNSClientMockRecorder) Close() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*DNSClient)(nil).Close))
 }
 
-// LookupIP mocks base method.
+// LookupIP mocks base method
-func (m *DNSClient) LookupIP(arg0 string) ([]net.IP, error) {
+func (m *DNSClient) LookupIP(arg0 string, arg1 dns.IPOption) ([]net.IP, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LookupIP", arg0)
+	ret := m.ctrl.Call(m, "LookupIP", arg0, arg1)
 	ret0, _ := ret[0].([]net.IP)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// LookupIP indicates an expected call of LookupIP.
+// LookupIP indicates an expected call of LookupIP
-func (mr *DNSClientMockRecorder) LookupIP(arg0 interface{}) *gomock.Call {
+func (mr *DNSClientMockRecorder) LookupIP(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LookupIP", reflect.TypeOf((*DNSClient)(nil).LookupIP), arg0)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LookupIP", reflect.TypeOf((*DNSClient)(nil).LookupIP), arg0, arg1)
 }
 
-// LookupOptions mocks base method.
+// Start mocks base method
-func (m *DNSClient) LookupOptions(arg0 string, arg1 ...dns.Option) ([]net.IP, error) {
-	m.ctrl.T.Helper()
-	varargs := []interface{}{arg0}
-	for _, a := range arg1 {
-		varargs = append(varargs, a)
-	}
-	ret := m.ctrl.Call(m, "LookupOptions", varargs...)
-	ret0, _ := ret[0].([]net.IP)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// LookupOptions indicates an expected call of LookupOptions.
-func (mr *DNSClientMockRecorder) LookupOptions(arg0 interface{}, arg1 ...interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	varargs := append([]interface{}{arg0}, arg1...)
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LookupOptions", reflect.TypeOf((*DNSClient)(nil).LookupOptions), varargs...)
-}
-
-// Start mocks base method.
 func (m *DNSClient) Start() error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Start")
@@ -92,13 +71,13 @@ func (m *DNSClient) Start() error {
 	return ret0
 }
 
-// Start indicates an expected call of Start.
+// Start indicates an expected call of Start
 func (mr *DNSClientMockRecorder) Start() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Start", reflect.TypeOf((*DNSClient)(nil).Start))
 }
 
-// Type mocks base method.
+// Type mocks base method
 func (m *DNSClient) Type() interface{} {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Type")
@@ -106,7 +85,7 @@ func (m *DNSClient) Type() interface{} {
 	return ret0
 }
 
-// Type indicates an expected call of Type.
+// Type indicates an expected call of Type
 func (mr *DNSClientMockRecorder) Type() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Type", reflect.TypeOf((*DNSClient)(nil).Type))

testing/mocks/io.go

@@ -5,35 +5,34 @@
 package mocks
 
 import (
-	reflect "reflect"
-
 	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
 )
 
-// Reader is a mock of Reader interface.
+// Reader is a mock of Reader interface
 type Reader struct {
 	ctrl     *gomock.Controller
 	recorder *ReaderMockRecorder
 }
 
-// ReaderMockRecorder is the mock recorder for Reader.
+// ReaderMockRecorder is the mock recorder for Reader
 type ReaderMockRecorder struct {
 	mock *Reader
 }
 
-// NewReader creates a new mock instance.
+// NewReader creates a new mock instance
 func NewReader(ctrl *gomock.Controller) *Reader {
 	mock := &Reader{ctrl: ctrl}
 	mock.recorder = &ReaderMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *Reader) EXPECT() *ReaderMockRecorder {
 	return m.recorder
 }
 
-// Read mocks base method.
+// Read mocks base method
 func (m *Reader) Read(arg0 []byte) (int, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Read", arg0)
@@ -42,36 +41,36 @@ func (m *Reader) Read(arg0 []byte) (int, error) {
 	return ret0, ret1
 }
 
-// Read indicates an expected call of Read.
+// Read indicates an expected call of Read
 func (mr *ReaderMockRecorder) Read(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Read", reflect.TypeOf((*Reader)(nil).Read), arg0)
 }
 
-// Writer is a mock of Writer interface.
+// Writer is a mock of Writer interface
 type Writer struct {
 	ctrl     *gomock.Controller
 	recorder *WriterMockRecorder
 }
 
-// WriterMockRecorder is the mock recorder for Writer.
+// WriterMockRecorder is the mock recorder for Writer
 type WriterMockRecorder struct {
 	mock *Writer
 }
 
-// NewWriter creates a new mock instance.
+// NewWriter creates a new mock instance
 func NewWriter(ctrl *gomock.Controller) *Writer {
 	mock := &Writer{ctrl: ctrl}
 	mock.recorder = &WriterMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *Writer) EXPECT() *WriterMockRecorder {
 	return m.recorder
 }
 
-// Write mocks base method.
+// Write mocks base method
 func (m *Writer) Write(arg0 []byte) (int, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Write", arg0)
@@ -80,7 +79,7 @@ func (m *Writer) Write(arg0 []byte) (int, error) {
 	return ret0, ret1
 }
 
-// Write indicates an expected call of Write.
+// Write indicates an expected call of Write
 func (mr *WriterMockRecorder) Write(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Write", reflect.TypeOf((*Writer)(nil).Write), arg0)

testing/mocks/log.go

@@ -5,42 +5,41 @@
 package mocks
 
 import (
-	reflect "reflect"
-
 	gomock "github.com/golang/mock/gomock"
 	log "github.com/xtls/xray-core/common/log"
+	reflect "reflect"
 )
 
-// LogHandler is a mock of Handler interface.
+// LogHandler is a mock of Handler interface
 type LogHandler struct {
 	ctrl     *gomock.Controller
 	recorder *LogHandlerMockRecorder
 }
 
-// LogHandlerMockRecorder is the mock recorder for LogHandler.
+// LogHandlerMockRecorder is the mock recorder for LogHandler
 type LogHandlerMockRecorder struct {
 	mock *LogHandler
 }
 
-// NewLogHandler creates a new mock instance.
+// NewLogHandler creates a new mock instance
 func NewLogHandler(ctrl *gomock.Controller) *LogHandler {
 	mock := &LogHandler{ctrl: ctrl}
 	mock.recorder = &LogHandlerMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *LogHandler) EXPECT() *LogHandlerMockRecorder {
 	return m.recorder
 }
 
-// Handle mocks base method.
+// Handle mocks base method
 func (m *LogHandler) Handle(arg0 log.Message) {
 	m.ctrl.T.Helper()
 	m.ctrl.Call(m, "Handle", arg0)
 }
 
-// Handle indicates an expected call of Handle.
+// Handle indicates an expected call of Handle
 func (mr *LogHandlerMockRecorder) Handle(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Handle", reflect.TypeOf((*LogHandler)(nil).Handle), arg0)

testing/mocks/mux.go

@@ -5,36 +5,35 @@
 package mocks
 
 import (
-	reflect "reflect"
-
 	gomock "github.com/golang/mock/gomock"
 	mux "github.com/xtls/xray-core/common/mux"
+	reflect "reflect"
 )
 
-// MuxClientWorkerFactory is a mock of ClientWorkerFactory interface.
+// MuxClientWorkerFactory is a mock of ClientWorkerFactory interface
 type MuxClientWorkerFactory struct {
 	ctrl     *gomock.Controller
 	recorder *MuxClientWorkerFactoryMockRecorder
 }
 
-// MuxClientWorkerFactoryMockRecorder is the mock recorder for MuxClientWorkerFactory.
+// MuxClientWorkerFactoryMockRecorder is the mock recorder for MuxClientWorkerFactory
 type MuxClientWorkerFactoryMockRecorder struct {
 	mock *MuxClientWorkerFactory
 }
 
-// NewMuxClientWorkerFactory creates a new mock instance.
+// NewMuxClientWorkerFactory creates a new mock instance
 func NewMuxClientWorkerFactory(ctrl *gomock.Controller) *MuxClientWorkerFactory {
 	mock := &MuxClientWorkerFactory{ctrl: ctrl}
 	mock.recorder = &MuxClientWorkerFactoryMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *MuxClientWorkerFactory) EXPECT() *MuxClientWorkerFactoryMockRecorder {
 	return m.recorder
 }
 
-// Create mocks base method.
+// Create mocks base method
 func (m *MuxClientWorkerFactory) Create() (*mux.ClientWorker, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Create")
@@ -43,7 +42,7 @@ func (m *MuxClientWorkerFactory) Create() (*mux.ClientWorker, error) {
 	return ret0, ret1
 }
 
-// Create indicates an expected call of Create.
+// Create indicates an expected call of Create
 func (mr *MuxClientWorkerFactoryMockRecorder) Create() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Create", reflect.TypeOf((*MuxClientWorkerFactory)(nil).Create))

testing/mocks/outbound.go

@@ -6,36 +6,35 @@ package mocks
 
 import (
 	context "context"
-	reflect "reflect"
-
 	gomock "github.com/golang/mock/gomock"
 	outbound "github.com/xtls/xray-core/features/outbound"
+	reflect "reflect"
 )
 
-// OutboundManager is a mock of Manager interface.
+// OutboundManager is a mock of Manager interface
 type OutboundManager struct {
 	ctrl     *gomock.Controller
 	recorder *OutboundManagerMockRecorder
 }
 
-// OutboundManagerMockRecorder is the mock recorder for OutboundManager.
+// OutboundManagerMockRecorder is the mock recorder for OutboundManager
 type OutboundManagerMockRecorder struct {
 	mock *OutboundManager
 }
 
-// NewOutboundManager creates a new mock instance.
+// NewOutboundManager creates a new mock instance
 func NewOutboundManager(ctrl *gomock.Controller) *OutboundManager {
 	mock := &OutboundManager{ctrl: ctrl}
 	mock.recorder = &OutboundManagerMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *OutboundManager) EXPECT() *OutboundManagerMockRecorder {
 	return m.recorder
 }
 
-// AddHandler mocks base method.
+// AddHandler mocks base method
 func (m *OutboundManager) AddHandler(arg0 context.Context, arg1 outbound.Handler) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "AddHandler", arg0, arg1)
@@ -43,13 +42,13 @@ func (m *OutboundManager) AddHandler(arg0 context.Context, arg1 outbound.Handler
 	return ret0
 }
 
-// AddHandler indicates an expected call of AddHandler.
+// AddHandler indicates an expected call of AddHandler
 func (mr *OutboundManagerMockRecorder) AddHandler(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddHandler", reflect.TypeOf((*OutboundManager)(nil).AddHandler), arg0, arg1)
 }
 
-// Close mocks base method.
+// Close mocks base method
 func (m *OutboundManager) Close() error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Close")
@@ -57,13 +56,13 @@ func (m *OutboundManager) Close() error {
 	return ret0
 }
 
-// Close indicates an expected call of Close.
+// Close indicates an expected call of Close
 func (mr *OutboundManagerMockRecorder) Close() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*OutboundManager)(nil).Close))
 }
 
-// GetDefaultHandler mocks base method.
+// GetDefaultHandler mocks base method
 func (m *OutboundManager) GetDefaultHandler() outbound.Handler {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetDefaultHandler")
@@ -71,13 +70,13 @@ func (m *OutboundManager) GetDefaultHandler() outbound.Handler {
 	return ret0
 }
 
-// GetDefaultHandler indicates an expected call of GetDefaultHandler.
+// GetDefaultHandler indicates an expected call of GetDefaultHandler
 func (mr *OutboundManagerMockRecorder) GetDefaultHandler() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetDefaultHandler", reflect.TypeOf((*OutboundManager)(nil).GetDefaultHandler))
 }
 
-// GetHandler mocks base method.
+// GetHandler mocks base method
 func (m *OutboundManager) GetHandler(arg0 string) outbound.Handler {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetHandler", arg0)
@@ -85,13 +84,13 @@ func (m *OutboundManager) GetHandler(arg0 string) outbound.Handler {
 	return ret0
 }
 
-// GetHandler indicates an expected call of GetHandler.
+// GetHandler indicates an expected call of GetHandler
 func (mr *OutboundManagerMockRecorder) GetHandler(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetHandler", reflect.TypeOf((*OutboundManager)(nil).GetHandler), arg0)
 }
 
-// RemoveHandler mocks base method.
+// RemoveHandler mocks base method
 func (m *OutboundManager) RemoveHandler(arg0 context.Context, arg1 string) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "RemoveHandler", arg0, arg1)
@@ -99,13 +98,13 @@ func (m *OutboundManager) RemoveHandler(arg0 context.Context, arg1 string) error
 	return ret0
 }
 
-// RemoveHandler indicates an expected call of RemoveHandler.
+// RemoveHandler indicates an expected call of RemoveHandler
 func (mr *OutboundManagerMockRecorder) RemoveHandler(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RemoveHandler", reflect.TypeOf((*OutboundManager)(nil).RemoveHandler), arg0, arg1)
 }
 
-// Start mocks base method.
+// Start mocks base method
 func (m *OutboundManager) Start() error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Start")
@@ -113,13 +112,13 @@ func (m *OutboundManager) Start() error {
 	return ret0
 }
 
-// Start indicates an expected call of Start.
+// Start indicates an expected call of Start
 func (mr *OutboundManagerMockRecorder) Start() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Start", reflect.TypeOf((*OutboundManager)(nil).Start))
 }
 
-// Type mocks base method.
+// Type mocks base method
 func (m *OutboundManager) Type() interface{} {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Type")
@@ -127,36 +126,36 @@ func (m *OutboundManager) Type() interface{} {
 	return ret0
 }
 
-// Type indicates an expected call of Type.
+// Type indicates an expected call of Type
 func (mr *OutboundManagerMockRecorder) Type() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Type", reflect.TypeOf((*OutboundManager)(nil).Type))
 }
 
-// OutboundHandlerSelector is a mock of HandlerSelector interface.
+// OutboundHandlerSelector is a mock of HandlerSelector interface
 type OutboundHandlerSelector struct {
 	ctrl     *gomock.Controller
 	recorder *OutboundHandlerSelectorMockRecorder
 }
 
-// OutboundHandlerSelectorMockRecorder is the mock recorder for OutboundHandlerSelector.
+// OutboundHandlerSelectorMockRecorder is the mock recorder for OutboundHandlerSelector
 type OutboundHandlerSelectorMockRecorder struct {
 	mock *OutboundHandlerSelector
 }
 
-// NewOutboundHandlerSelector creates a new mock instance.
+// NewOutboundHandlerSelector creates a new mock instance
 func NewOutboundHandlerSelector(ctrl *gomock.Controller) *OutboundHandlerSelector {
 	mock := &OutboundHandlerSelector{ctrl: ctrl}
 	mock.recorder = &OutboundHandlerSelectorMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *OutboundHandlerSelector) EXPECT() *OutboundHandlerSelectorMockRecorder {
 	return m.recorder
 }
 
-// Select mocks base method.
+// Select mocks base method
 func (m *OutboundHandlerSelector) Select(arg0 []string) []string {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Select", arg0)
@@ -164,7 +163,7 @@ func (m *OutboundHandlerSelector) Select(arg0 []string) []string {
 	return ret0
 }
 
-// Select indicates an expected call of Select.
+// Select indicates an expected call of Select
 func (mr *OutboundHandlerSelectorMockRecorder) Select(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Select", reflect.TypeOf((*OutboundHandlerSelector)(nil).Select), arg0)

testing/mocks/proxy.go

@@ -6,39 +6,38 @@ package mocks
 
 import (
 	context "context"
-	reflect "reflect"
-
 	gomock "github.com/golang/mock/gomock"
 	net "github.com/xtls/xray-core/common/net"
 	routing "github.com/xtls/xray-core/features/routing"
 	transport "github.com/xtls/xray-core/transport"
 	internet "github.com/xtls/xray-core/transport/internet"
+	reflect "reflect"
 )
 
-// ProxyInbound is a mock of Inbound interface.
+// ProxyInbound is a mock of Inbound interface
 type ProxyInbound struct {
 	ctrl     *gomock.Controller
 	recorder *ProxyInboundMockRecorder
 }
 
-// ProxyInboundMockRecorder is the mock recorder for ProxyInbound.
+// ProxyInboundMockRecorder is the mock recorder for ProxyInbound
 type ProxyInboundMockRecorder struct {
 	mock *ProxyInbound
 }
 
-// NewProxyInbound creates a new mock instance.
+// NewProxyInbound creates a new mock instance
 func NewProxyInbound(ctrl *gomock.Controller) *ProxyInbound {
 	mock := &ProxyInbound{ctrl: ctrl}
 	mock.recorder = &ProxyInboundMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *ProxyInbound) EXPECT() *ProxyInboundMockRecorder {
 	return m.recorder
 }
 
-// Network mocks base method.
+// Network mocks base method
 func (m *ProxyInbound) Network() []net.Network {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Network")
@@ -46,13 +45,13 @@ func (m *ProxyInbound) Network() []net.Network {
 	return ret0
 }
 
-// Network indicates an expected call of Network.
+// Network indicates an expected call of Network
 func (mr *ProxyInboundMockRecorder) Network() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Network", reflect.TypeOf((*ProxyInbound)(nil).Network))
 }
 
-// Process mocks base method.
+// Process mocks base method
 func (m *ProxyInbound) Process(arg0 context.Context, arg1 net.Network, arg2 internet.Connection, arg3 routing.Dispatcher) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Process", arg0, arg1, arg2, arg3)
@@ -60,36 +59,36 @@ func (m *ProxyInbound) Process(arg0 context.Context, arg1 net.Network, arg2 inte
 	return ret0
 }
 
-// Process indicates an expected call of Process.
+// Process indicates an expected call of Process
 func (mr *ProxyInboundMockRecorder) Process(arg0, arg1, arg2, arg3 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Process", reflect.TypeOf((*ProxyInbound)(nil).Process), arg0, arg1, arg2, arg3)
 }
 
-// ProxyOutbound is a mock of Outbound interface.
+// ProxyOutbound is a mock of Outbound interface
 type ProxyOutbound struct {
 	ctrl     *gomock.Controller
 	recorder *ProxyOutboundMockRecorder
 }
 
-// ProxyOutboundMockRecorder is the mock recorder for ProxyOutbound.
+// ProxyOutboundMockRecorder is the mock recorder for ProxyOutbound
 type ProxyOutboundMockRecorder struct {
 	mock *ProxyOutbound
 }
 
-// NewProxyOutbound creates a new mock instance.
+// NewProxyOutbound creates a new mock instance
 func NewProxyOutbound(ctrl *gomock.Controller) *ProxyOutbound {
 	mock := &ProxyOutbound{ctrl: ctrl}
 	mock.recorder = &ProxyOutboundMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use.
+// EXPECT returns an object that allows the caller to indicate expected use
 func (m *ProxyOutbound) EXPECT() *ProxyOutboundMockRecorder {
 	return m.recorder
 }
 
-// Process mocks base method.
+// Process mocks base method
 func (m *ProxyOutbound) Process(arg0 context.Context, arg1 *transport.Link, arg2 internet.Dialer) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Process", arg0, arg1, arg2)
@@ -97,7 +96,7 @@ func (m *ProxyOutbound) Process(arg0 context.Context, arg1 *transport.Link, arg2
 	return ret0
 }
 
-// Process indicates an expected call of Process.
+// Process indicates an expected call of Process
 func (mr *ProxyOutboundMockRecorder) Process(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Process", reflect.TypeOf((*ProxyOutbound)(nil).Process), arg0, arg1, arg2)

transport/internet/grpc/dial.go

@@ -52,7 +52,7 @@ func dialgRPC(ctx context.Context, dest net.Destination, streamSettings *interne
 	conn, err := getGrpcClient(ctx, dest, tlsConfig, streamSettings.SocketSettings)
 
 	if err != nil {
-		return nil, newError("Cannot dial gRPC").Base(err)
+		return nil, newError("failed to dial gRPC").Base(err)
 	}
 	client := encoding.NewGRPCServiceClient(conn)
 	if grpcSettings.MultiMode {
@@ -113,12 +113,6 @@ func getGrpcClient(ctx context.Context, dest net.Destination, tlsConfig *tls.Con
 			gctx = session.ContextWithOutbound(gctx, session.OutboundFromContext(ctx))
 
 			rawHost, rawPort, err := net.SplitHostPort(s)
-			select {
-			case <-gctx.Done():
-				return nil, gctx.Err()
-			default:
-			}
-
 			if err != nil {
 				return nil, err
 			}
@@ -130,8 +124,15 @@ func getGrpcClient(ctx context.Context, dest net.Destination, tlsConfig *tls.Con
 				return nil, err
 			}
 			address := net.ParseAddress(rawHost)
-			return internet.DialSystem(gctx, net.TCPDestination(address, port), sockopt)
+			conn, err := internet.DialSystem(gctx, net.TCPDestination(address, port), sockopt)
+			if err != nil {
+				newError("failed to dial connection for gRPC").Base(err).WriteToLog()
+			}
+			return conn, err
 		}),
+		grpc.WithBlock(),
+		grpc.WithReturnConnectionError(),
+		grpc.WithDisableRetry(),
 	)
 	globalDialerMap[dialerConf{dest, sockopt, tlsConfig}] = conn
 	return conn, err

transport/internet/system_dialer.go

@@ -63,23 +63,40 @@ func (d *DefaultSystemDialer) lookupIP(domain string, strategy DomainStrategy, l
 		return nil, nil
 	}
 
-	var opt dns.Option
+	var option = dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	}
+
 	switch {
 	case strategy == DomainStrategy_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()):
-		opt = dns.LookupIPv4Only
+		option = dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: false,
+		}
 	case strategy == DomainStrategy_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()):
-		opt = dns.LookupIPv6Only
+		option = dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		}
 	case strategy == DomainStrategy_AS_IS:
 		return nil, nil
 	}
 
-	return d.dns.LookupOptions(domain, opt, dns.LookupNoFake)
+	return d.dns.LookupIP(domain, option)
 }
 
 func (d *DefaultSystemDialer) canLookupIP(ctx context.Context, dst net.Destination, sockopt *SocketConfig) bool {
 	if sockopt == nil || dst.Address.Family().IsIP() || d.dns == nil {
 		return false
 	}
+	if dst.Address.Domain() == LookupDomainFromContext(ctx) {
+		newError("infinite loop detected").AtError().WriteToLog(session.ExportIDToError(ctx))
+		return false
+	}
 	return sockopt.DomainStrategy != DomainStrategy_AS_IS
 }
 

transport/internet/system_dialer_context.go

@@ -0,0 +1,18 @@
+package internet
+
+import "context"
+
+type systemDialer int
+
+const systemDialerKey systemDialer = 0
+
+func ContextWithLookupDomain(ctx context.Context, domain string) context.Context {
+	return context.WithValue(ctx, systemDialerKey, domain)
+}
+
+func LookupDomainFromContext(ctx context.Context) string {
+	if domain, ok := ctx.Value(systemDialerKey).(string); ok {
+		return domain
+	}
+	return ""
+}