Add domain strategy for dns outbound

features/dns/client.go

@@ -94,6 +94,12 @@ var (
 		d.FakeEnable = true
 		return d
 	}
+	LookupFakeOnly = func(d *IPOption) *IPOption {
+		d.FakeEnable = true
+		d.IPv4Enable = false
+		d.IPv6Enable = false
+		return d
+	}
 	LookupNoFake = func(d *IPOption) *IPOption {
 		d.FakeEnable = false
 		return d

infra/conf/dns_proxy.go

@@ -1,6 +1,8 @@
 package conf
 
 import (
+	"strings"
+
 	"github.com/golang/protobuf/proto"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/proxy/dns"
@@ -10,6 +12,7 @@ type DNSOutboundConfig struct {
 	Network        Network  `json:"network"`
 	Address        *Address `json:"address"`
 	Port           uint16   `json:"port"`
+	DomainStrategy string   `json:"domainStrategy"`
 }
 
 func (c *DNSOutboundConfig) Build() (proto.Message, error) {
@@ -22,5 +25,12 @@ func (c *DNSOutboundConfig) Build() (proto.Message, error) {
 	if c.Address != nil {
 		config.Server.Address = c.Address.Build()
 	}
+	config.DomainStrategy = dns.Config_USE_ALL
+	switch strings.ToLower(c.DomainStrategy) {
+	case "useip", "use_ip", "use-ip":
+		config.DomainStrategy = dns.Config_USE_IP
+	case "fake", "fakedns":
+		config.DomainStrategy = dns.Config_USE_FAKE
+	}
 	return config, nil
 }

infra/conf/dns_proxy_test.go

@@ -27,6 +27,7 @@ func TestDnsProxyConfig(t *testing.T) {
 					Address: net.NewIPOrDomain(net.IPAddress([]byte{8, 8, 8, 8})),
 					Port:    53,
 				},
+				DomainStrategy: dns.Config_USE_ALL,
 			},
 		},
 	})

proxy/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        v3.14.0
+// 	protoc        v3.15.8
 // source: proxy/dns/config.proto
 
 package dns
@@ -26,6 +26,55 @@ const (
 // of the legacy proto package is being used.
 const _ = proto.ProtoPackageIsVersion4
 
+type Config_DomainStrategy int32
+
+const (
+	Config_USE_ALL  Config_DomainStrategy = 0
+	Config_USE_IP   Config_DomainStrategy = 1
+	Config_USE_FAKE Config_DomainStrategy = 2
+)
+
+// Enum value maps for Config_DomainStrategy.
+var (
+	Config_DomainStrategy_name = map[int32]string{
+		0: "USE_ALL",
+		1: "USE_IP",
+		2: "USE_FAKE",
+	}
+	Config_DomainStrategy_value = map[string]int32{
+		"USE_ALL":  0,
+		"USE_IP":   1,
+		"USE_FAKE": 2,
+	}
+)
+
+func (x Config_DomainStrategy) Enum() *Config_DomainStrategy {
+	p := new(Config_DomainStrategy)
+	*p = x
+	return p
+}
+
+func (x Config_DomainStrategy) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (Config_DomainStrategy) Descriptor() protoreflect.EnumDescriptor {
+	return file_proxy_dns_config_proto_enumTypes[0].Descriptor()
+}
+
+func (Config_DomainStrategy) Type() protoreflect.EnumType {
+	return &file_proxy_dns_config_proto_enumTypes[0]
+}
+
+func (x Config_DomainStrategy) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use Config_DomainStrategy.Descriptor instead.
+func (Config_DomainStrategy) EnumDescriptor() ([]byte, []int) {
+	return file_proxy_dns_config_proto_rawDescGZIP(), []int{0, 0}
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -34,6 +83,7 @@ type Config struct {
 	// Server is the DNS server address. If specified, this address overrides the
 	// original one.
 	Server         *net.Endpoint         `protobuf:"bytes,1,opt,name=server,proto3" json:"server,omitempty"`
+	DomainStrategy Config_DomainStrategy `protobuf:"varint,2,opt,name=domain_strategy,json=domainStrategy,proto3,enum=xray.proxy.dns.Config_DomainStrategy" json:"domain_strategy,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -75,6 +125,13 @@ func (x *Config) GetServer() *net.Endpoint {
 	return nil
 }
 
+func (x *Config) GetDomainStrategy() Config_DomainStrategy {
+	if x != nil {
+		return x.DomainStrategy
+	}
+	return Config_USE_ALL
+}
+
 var File_proxy_dns_config_proto protoreflect.FileDescriptor
 
 var file_proxy_dns_config_proto_rawDesc = []byte{
@@ -82,16 +139,25 @@ var file_proxy_dns_config_proto_rawDesc = []byte{
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+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -106,18 +172,21 @@ func file_proxy_dns_config_proto_rawDescGZIP() []byte {
 	return file_proxy_dns_config_proto_rawDescData
 }
 
+var file_proxy_dns_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
 var file_proxy_dns_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
 var file_proxy_dns_config_proto_goTypes = []interface{}{
-	(*Config)(nil),       // 0: xray.proxy.dns.Config
+	(Config_DomainStrategy)(0), // 0: xray.proxy.dns.Config.DomainStrategy
-	(*net.Endpoint)(nil), // 1: xray.common.net.Endpoint
+	(*Config)(nil),             // 1: xray.proxy.dns.Config
+	(*net.Endpoint)(nil),       // 2: xray.common.net.Endpoint
 }
 var file_proxy_dns_config_proto_depIdxs = []int32{
-	1, // 0: xray.proxy.dns.Config.server:type_name -> xray.common.net.Endpoint
+	2, // 0: xray.proxy.dns.Config.server:type_name -> xray.common.net.Endpoint
-	1, // [1:1] is the sub-list for method output_type
+	0, // 1: xray.proxy.dns.Config.domain_strategy:type_name -> xray.proxy.dns.Config.DomainStrategy
-	1, // [1:1] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for method output_type
-	1, // [1:1] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for method input_type
-	1, // [1:1] is the sub-list for extension extendee
+	2, // [2:2] is the sub-list for extension type_name
-	0, // [0:1] is the sub-list for field type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
 }
 
 func init() { file_proxy_dns_config_proto_init() }
@@ -144,13 +213,14 @@ func file_proxy_dns_config_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_proxy_dns_config_proto_rawDesc,
-			NumEnums:      0,
+			NumEnums:      1,
 			NumMessages:   1,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_proxy_dns_config_proto_goTypes,
 		DependencyIndexes: file_proxy_dns_config_proto_depIdxs,
+		EnumInfos:         file_proxy_dns_config_proto_enumTypes,
 		MessageInfos:      file_proxy_dns_config_proto_msgTypes,
 	}.Build()
 	File_proxy_dns_config_proto = out.File

proxy/dns/config.proto

@@ -12,4 +12,10 @@ message Config {
   // Server is the DNS server address. If specified, this address overrides the
   // original one.
   xray.common.net.Endpoint server = 1;
+  enum DomainStrategy {
+    USE_ALL = 0;
+    USE_IP = 1;
+    USE_FAKE = 2;
+  }
+  DomainStrategy domain_strategy = 2;
 }

proxy/dns/dns.go

@@ -39,6 +39,7 @@ type Handler struct {
 	client          dns.Client
 	ownLinkVerifier ownLinkVerifier
 	server          net.Destination
+	DomainStrategy  Config_DomainStrategy
 }
 
 func (h *Handler) Init(config *Config, dnsClient dns.Client) error {
@@ -199,16 +200,24 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
 	var err error
 
 	var ttl uint32 = 600
-	var opt dns.Option
+	var opt []dns.Option
 
+	if h.DomainStrategy == Config_USE_FAKE {
+		opt = append(opt, dns.LookupFakeOnly)
+	} else {
 		switch qType {
 		case dnsmessage.TypeA:
-		opt = dns.LookupIPv4Only
+			opt = append(opt, dns.LookupIPv4Only)
 		case dnsmessage.TypeAAAA:
-		opt = dns.LookupIPv6Only
+			opt = append(opt, dns.LookupIPv6Only)
+		}
 	}
 
-	ips, err = h.client.LookupOptions(domain, opt, dns.LookupFake)
+	if h.DomainStrategy == Config_USE_ALL {
+		opt = append(opt, dns.LookupFake)
+	}
+
+	ips, err = h.client.LookupOptions(domain, opt...)
 	rcode := dns.RCodeFromError(err)
 	if rcode == 0 && len(ips) == 0 && err != dns.ErrEmptyResponse {
 		newError("ip query").Base(err).WriteToLog()