support per-domain prioritized name server

app/dns/config.pb.go

@@ -16,33 +16,130 @@ var _ = math.Inf
 // proto package needs to be updated.
 const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
 
-type Config_HostMapping_Type int32
+type DomainMatchingType int32
 
 const (
-	Config_HostMapping_Full      Config_HostMapping_Type = 0
-	Config_HostMapping_SubDomain Config_HostMapping_Type = 1
+	DomainMatchingType_Full      DomainMatchingType = 0
+	DomainMatchingType_Subdomain DomainMatchingType = 1
+	DomainMatchingType_Keyword   DomainMatchingType = 2
 )
 
-var Config_HostMapping_Type_name = map[int32]string{
+var DomainMatchingType_name = map[int32]string{
 	0: "Full",
-	1: "SubDomain",
+	1: "Subdomain",
+	2: "Keyword",
 }
-var Config_HostMapping_Type_value = map[string]int32{
+var DomainMatchingType_value = map[string]int32{
 	"Full":      0,
-	"SubDomain": 1,
+	"Subdomain": 1,
+	"Keyword":   2,
 }
 
-func (x Config_HostMapping_Type) String() string {
-	return proto.EnumName(Config_HostMapping_Type_name, int32(x))
+func (x DomainMatchingType) String() string {
+	return proto.EnumName(DomainMatchingType_name, int32(x))
 }
-func (Config_HostMapping_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_config_b3d430ec01af18aa, []int{0, 1, 0}
+func (DomainMatchingType) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_config_6f85f947d5116df4, []int{0}
+}
+
+type NameServer struct {
+	Address              *net.Endpoint                `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
+	PrioritizedDomain    []*NameServer_PriorityDomain `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                     `json:"-"`
+	XXX_unrecognized     []byte                       `json:"-"`
+	XXX_sizecache        int32                        `json:"-"`
+}
+
+func (m *NameServer) Reset()         { *m = NameServer{} }
+func (m *NameServer) String() string { return proto.CompactTextString(m) }
+func (*NameServer) ProtoMessage()    {}
+func (*NameServer) Descriptor() ([]byte, []int) {
+	return fileDescriptor_config_6f85f947d5116df4, []int{0}
+}
+func (m *NameServer) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_NameServer.Unmarshal(m, b)
+}
+func (m *NameServer) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_NameServer.Marshal(b, m, deterministic)
+}
+func (dst *NameServer) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_NameServer.Merge(dst, src)
+}
+func (m *NameServer) XXX_Size() int {
+	return xxx_messageInfo_NameServer.Size(m)
+}
+func (m *NameServer) XXX_DiscardUnknown() {
+	xxx_messageInfo_NameServer.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_NameServer proto.InternalMessageInfo
+
+func (m *NameServer) GetAddress() *net.Endpoint {
+	if m != nil {
+		return m.Address
+	}
+	return nil
+}
+
+func (m *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain {
+	if m != nil {
+		return m.PrioritizedDomain
+	}
+	return nil
+}
+
+type NameServer_PriorityDomain struct {
+	Type                 DomainMatchingType `protobuf:"varint,1,opt,name=type,proto3,enum=v2ray.core.app.dns.DomainMatchingType" json:"type,omitempty"`
+	Domain               string             `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
+	XXX_unrecognized     []byte             `json:"-"`
+	XXX_sizecache        int32              `json:"-"`
+}
+
+func (m *NameServer_PriorityDomain) Reset()         { *m = NameServer_PriorityDomain{} }
+func (m *NameServer_PriorityDomain) String() string { return proto.CompactTextString(m) }
+func (*NameServer_PriorityDomain) ProtoMessage()    {}
+func (*NameServer_PriorityDomain) Descriptor() ([]byte, []int) {
+	return fileDescriptor_config_6f85f947d5116df4, []int{0, 0}
+}
+func (m *NameServer_PriorityDomain) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_NameServer_PriorityDomain.Unmarshal(m, b)
+}
+func (m *NameServer_PriorityDomain) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_NameServer_PriorityDomain.Marshal(b, m, deterministic)
+}
+func (dst *NameServer_PriorityDomain) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_NameServer_PriorityDomain.Merge(dst, src)
+}
+func (m *NameServer_PriorityDomain) XXX_Size() int {
+	return xxx_messageInfo_NameServer_PriorityDomain.Size(m)
+}
+func (m *NameServer_PriorityDomain) XXX_DiscardUnknown() {
+	xxx_messageInfo_NameServer_PriorityDomain.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_NameServer_PriorityDomain proto.InternalMessageInfo
+
+func (m *NameServer_PriorityDomain) GetType() DomainMatchingType {
+	if m != nil {
+		return m.Type
+	}
+	return DomainMatchingType_Full
+}
+
+func (m *NameServer_PriorityDomain) GetDomain() string {
+	if m != nil {
+		return m.Domain
+	}
+	return ""
 }
 
 type Config struct {
 	// 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 use DNS on local system.
-	NameServers []*net.Endpoint `protobuf:"bytes,1,rep,name=NameServers,proto3" json:"NameServers,omitempty"`
+	NameServers []*net.Endpoint `protobuf:"bytes,1,rep,name=NameServers,proto3" json:"NameServers,omitempty"` // Deprecated: Do not use.
+	// NameServer list used by this DNS client.
+	NameServer []*NameServer `protobuf:"bytes,5,rep,name=name_server,json=nameServer,proto3" json:"name_server,omitempty"`
 	// Static hosts. Domain to IP.
 	// Deprecated. Use static_hosts.
 	Hosts map[string]*net.IPOrDomain `protobuf:"bytes,2,rep,name=Hosts,proto3" json:"Hosts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"` // Deprecated: Do not use.
@@ -58,7 +155,7 @@ func (m *Config) Reset()         { *m = Config{} }
 func (m *Config) String() string { return proto.CompactTextString(m) }
 func (*Config) ProtoMessage()    {}
 func (*Config) Descriptor() ([]byte, []int) {
-	return fileDescriptor_config_b3d430ec01af18aa, []int{0}
+	return fileDescriptor_config_6f85f947d5116df4, []int{1}
 }
 func (m *Config) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Config.Unmarshal(m, b)
@@ -78,6 +175,7 @@ func (m *Config) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_Config proto.InternalMessageInfo
 
+// Deprecated: Do not use.
 func (m *Config) GetNameServers() []*net.Endpoint {
 	if m != nil {
 		return m.NameServers
@@ -85,6 +183,13 @@ func (m *Config) GetNameServers() []*net.Endpoint {
 	return nil
 }
 
+func (m *Config) GetNameServer() []*NameServer {
+	if m != nil {
+		return m.NameServer
+	}
+	return nil
+}
+
 // Deprecated: Do not use.
 func (m *Config) GetHosts() map[string]*net.IPOrDomain {
 	if m != nil {
@@ -108,19 +213,19 @@ func (m *Config) GetStaticHosts() []*Config_HostMapping {
 }
 
 type Config_HostMapping struct {
-	Type                 Config_HostMapping_Type `protobuf:"varint,1,opt,name=type,proto3,enum=v2ray.core.app.dns.Config_HostMapping_Type" json:"type,omitempty"`
-	Domain               string                  `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
-	Ip                   [][]byte                `protobuf:"bytes,3,rep,name=ip,proto3" json:"ip,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
-	XXX_unrecognized     []byte                  `json:"-"`
-	XXX_sizecache        int32                   `json:"-"`
+	Type                 DomainMatchingType `protobuf:"varint,1,opt,name=type,proto3,enum=v2ray.core.app.dns.DomainMatchingType" json:"type,omitempty"`
+	Domain               string             `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
+	Ip                   [][]byte           `protobuf:"bytes,3,rep,name=ip,proto3" json:"ip,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
+	XXX_unrecognized     []byte             `json:"-"`
+	XXX_sizecache        int32              `json:"-"`
 }
 
 func (m *Config_HostMapping) Reset()         { *m = Config_HostMapping{} }
 func (m *Config_HostMapping) String() string { return proto.CompactTextString(m) }
 func (*Config_HostMapping) ProtoMessage()    {}
 func (*Config_HostMapping) Descriptor() ([]byte, []int) {
-	return fileDescriptor_config_b3d430ec01af18aa, []int{0, 1}
+	return fileDescriptor_config_6f85f947d5116df4, []int{1, 1}
 }
 func (m *Config_HostMapping) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Config_HostMapping.Unmarshal(m, b)
@@ -140,11 +245,11 @@ func (m *Config_HostMapping) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_Config_HostMapping proto.InternalMessageInfo
 
-func (m *Config_HostMapping) GetType() Config_HostMapping_Type {
+func (m *Config_HostMapping) GetType() DomainMatchingType {
 	if m != nil {
 		return m.Type
 	}
-	return Config_HostMapping_Full
+	return DomainMatchingType_Full
 }
 
 func (m *Config_HostMapping) GetDomain() string {
@@ -162,42 +267,51 @@ func (m *Config_HostMapping) GetIp() [][]byte {
 }
 
 func init() {
+	proto.RegisterType((*NameServer)(nil), "v2ray.core.app.dns.NameServer")
+	proto.RegisterType((*NameServer_PriorityDomain)(nil), "v2ray.core.app.dns.NameServer.PriorityDomain")
 	proto.RegisterType((*Config)(nil), "v2ray.core.app.dns.Config")
 	proto.RegisterMapType((map[string]*net.IPOrDomain)(nil), "v2ray.core.app.dns.Config.HostsEntry")
 	proto.RegisterType((*Config_HostMapping)(nil), "v2ray.core.app.dns.Config.HostMapping")
-	proto.RegisterEnum("v2ray.core.app.dns.Config_HostMapping_Type", Config_HostMapping_Type_name, Config_HostMapping_Type_value)
+	proto.RegisterEnum("v2ray.core.app.dns.DomainMatchingType", DomainMatchingType_name, DomainMatchingType_value)
 }
 
 func init() {
-	proto.RegisterFile("v2ray.com/core/app/dns/config.proto", fileDescriptor_config_b3d430ec01af18aa)
-}
-
-var fileDescriptor_config_b3d430ec01af18aa = []byte{
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+	proto.RegisterFile("v2ray.com/core/app/dns/config.proto", fileDescriptor_config_6f85f947d5116df4)
+}
+
+var fileDescriptor_config_6f85f947d5116df4 = []byte{
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+	0x23, 0x04, 0x00, 0x00,
 }

app/dns/config.proto

@@ -9,10 +9,30 @@ option java_multiple_files = true;
 import "v2ray.com/core/common/net/address.proto";
 import "v2ray.com/core/common/net/destination.proto";
 
+message NameServer {
+  v2ray.core.common.net.Endpoint address = 1;
+
+  message PriorityDomain {
+    DomainMatchingType type = 1;
+    string domain = 2;
+  }
+
+  repeated PriorityDomain prioritized_domain = 2;
+}
+
+enum DomainMatchingType {
+  Full = 0;
+  Subdomain = 1;
+  Keyword = 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 use DNS on local system.
-  repeated v2ray.core.common.net.Endpoint NameServers = 1;
+  repeated v2ray.core.common.net.Endpoint NameServers = 1 [deprecated = true];
+
+  // NameServer list used by this DNS client.
+  repeated NameServer name_server = 5;
 
   // Static hosts. Domain to IP.
   // Deprecated. Use static_hosts.
@@ -22,12 +42,7 @@ message Config {
   bytes client_ip = 3;
 
   message HostMapping {
-    enum Type {
-      Full = 0;
-      SubDomain = 1;
-    }
-
-    Type type = 1;
+    DomainMatchingType type = 1;
     string domain = 2;
     repeated bytes ip = 3;
   }

app/dns/hosts.go

@@ -11,9 +11,22 @@ type StaticHosts struct {
 	matchers *strmatcher.MatcherGroup
 }
 
-var typeMap = map[Config_HostMapping_Type]strmatcher.Type{
-	Config_HostMapping_Full:      strmatcher.Full,
-	Config_HostMapping_SubDomain: strmatcher.Domain,
+var typeMap = map[DomainMatchingType]strmatcher.Type{
+	DomainMatchingType_Full:      strmatcher.Full,
+	DomainMatchingType_Subdomain: strmatcher.Domain,
+	DomainMatchingType_Keyword:   strmatcher.Substr,
+}
+
+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 NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDomain) (*StaticHosts, error) {
@@ -39,11 +52,7 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 	}
 
 	for _, mapping := range hosts {
-		strMType, f := typeMap[mapping.Type]
-		if !f {
-			return nil, newError("unknown mapping type", mapping.Type).AtWarning()
-		}
-		matcher, err := strMType.New(mapping.Domain)
+		matcher, err := toStrMatcher(mapping.Type, mapping.Domain)
 		if err != nil {
 			return nil, newError("failed to create domain matcher").Base(err)
 		}

app/dns/hosts_test.go

@@ -12,14 +12,14 @@ func TestStaticHosts(t *testing.T) {
 
 	pb := []*Config_HostMapping{
 		{
-			Type:   Config_HostMapping_Full,
+			Type:   DomainMatchingType_Full,
 			Domain: "v2ray.com",
 			Ip: [][]byte{
 				{1, 1, 1, 1},
 			},
 		},
 		{
-			Type:   Config_HostMapping_SubDomain,
+			Type:   DomainMatchingType_Subdomain,
 			Domain: "v2ray.cn",
 			Ip: [][]byte{
 				{2, 2, 2, 2},

app/dns/nameserver.go

@@ -6,7 +6,7 @@ import (
 	"v2ray.com/core/common/net"
 )
 
-type NameServer interface {
+type NameServerInterface interface {
 	QueryIP(ctx context.Context, domain string) ([]net.IP, error)
 }
 

app/dns/server.go

@@ -10,18 +10,21 @@ import (
 	"v2ray.com/core"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/strmatcher"
 )
 
 type Server struct {
 	sync.Mutex
-	hosts    *StaticHosts
-	servers  []NameServer
-	clientIP net.IP
+	hosts          *StaticHosts
+	servers        []NameServerInterface
+	clientIP       net.IP
+	domainMatcher  strmatcher.IndexMatcher
+	domainIndexMap map[uint32]uint32
 }
 
 func New(ctx context.Context, config *Config) (*Server, error) {
 	server := &Server{
-		servers: make([]NameServer, len(config.NameServers)),
+		servers: make([]NameServerInterface, 0, len(config.NameServers)+len(config.NameServer)),
 	}
 	if len(config.ClientIp) > 0 {
 		if len(config.ClientIp) != 4 && len(config.ClientIp) != 16 {
@@ -41,20 +44,52 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 		return nil, newError("unable to register DNSClient.").Base(err)
 	}
 
-	for idx, destPB := range config.NameServers {
-		address := destPB.Address.AsAddress()
+	addNameServer := func(endpoint *net.Endpoint) int {
+		address := endpoint.Address.AsAddress()
 		if address.Family().IsDomain() && address.Domain() == "localhost" {
-			server.servers[idx] = NewLocalNameServer()
+			server.servers = append(server.servers, NewLocalNameServer())
 		} else {
-			dest := destPB.AsDestination()
+			dest := endpoint.AsDestination()
 			if dest.Network == net.Network_Unknown {
 				dest.Network = net.Network_UDP
 			}
 			if dest.Network == net.Network_UDP {
-				server.servers[idx] = NewClassicNameServer(dest, v.Dispatcher(), server.clientIP)
+				server.servers = append(server.servers, NewClassicNameServer(dest, v.Dispatcher(), server.clientIP))
 			}
 		}
+		return len(server.servers) - 1
 	}
+
+	for _, destPB := range config.NameServers {
+		addNameServer(destPB)
+	}
+
+	if len(config.NameServer) > 0 {
+		domainMatcher := &strmatcher.MatcherGroup{}
+		domainIndexMap := make(map[uint32]uint32)
+
+		for _, ns := range config.NameServer {
+			idx := addNameServer(ns.Address)
+
+			for _, domain := range ns.PrioritizedDomain {
+				matcher, err := toStrMatcher(domain.Type, domain.Domain)
+				if err != nil {
+					return nil, newError("failed to create proritized domain").Base(err).AtWarning()
+				}
+				midx := domainMatcher.Add(matcher)
+				domainIndexMap[midx] = uint32(idx)
+			}
+		}
+
+		if domainMatcher.Size() > 64 {
+			server.domainMatcher = strmatcher.NewCachedMatcherGroup(domainMatcher)
+		} else {
+			server.domainMatcher = domainMatcher
+		}
+
+		server.domainIndexMap = domainIndexMap
+	}
+
 	if len(config.NameServers) == 0 {
 		server.servers = append(server.servers, NewLocalNameServer())
 	}
@@ -72,22 +107,41 @@ func (s *Server) Close() error {
 	return nil
 }
 
+func (s *Server) queryIPTimeout(server NameServerInterface, domain string) ([]net.IP, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
+	ips, err := server.QueryIP(ctx, domain)
+	cancel()
+	return ips, err
+}
+
 func (s *Server) LookupIP(domain string) ([]net.IP, error) {
 	if ip := s.hosts.LookupIP(domain); len(ip) > 0 {
 		return ip, nil
 	}
 
 	var lastErr error
-	for _, server := range s.servers {
-		ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
-		ips, err := server.QueryIP(ctx, domain)
-		cancel()
-		if err != nil {
-			lastErr = err
+	if s.domainMatcher != nil {
+		idx := s.domainMatcher.Match(domain)
+		if idx > 0 {
+			ns := s.servers[idx]
+			ips, err := s.queryIPTimeout(ns, domain)
+			if len(ips) > 0 {
+				return ips, nil
+			}
+			if err != nil {
+				lastErr = err
+			}
 		}
+	}
+
+	for _, server := range s.servers {
+		ips, err := s.queryIPTimeout(server, domain)
 		if len(ips) > 0 {
 			return ips, nil
 		}
+		if err != nil {
+			lastErr = err
+		}
 	}
 
 	return nil, newError("returning nil for domain ", domain).Base(lastErr)

app/dns/server_test.go

@@ -2,6 +2,7 @@ package dns_test
 
 import (
 	"testing"
+	"time"
 
 	"v2ray.com/core"
 	"v2ray.com/core/app/dispatcher"
@@ -98,3 +99,79 @@ func TestUDPServer(t *testing.T) {
 	assert(len(ips), Equals, 1)
 	assert([]byte(ips[0]), Equals, []byte{8, 8, 8, 8})
 }
+
+func TestPrioritizedDomain(t *testing.T) {
+	assert := With(t)
+
+	port := udp.PickPort()
+
+	dnsServer := dns.Server{
+		Addr:    "127.0.0.1:" + port.String(),
+		Net:     "udp",
+		Handler: &staticHandler{},
+		UDPSize: 1200,
+	}
+
+	go dnsServer.ListenAndServe()
+
+	config := &core.Config{
+		App: []*serial.TypedMessage{
+			serial.ToTypedMessage(&Config{
+				NameServers: []*net.Endpoint{
+					{
+						Network: net.Network_UDP,
+						Address: &net.IPOrDomain{
+							Address: &net.IPOrDomain_Ip{
+								Ip: []byte{127, 0, 0, 1},
+							},
+						},
+						Port: 9999, /* unreachable */
+					},
+				},
+				NameServer: []*NameServer{
+					{
+						Address: &net.Endpoint{
+							Network: net.Network_UDP,
+							Address: &net.IPOrDomain{
+								Address: &net.IPOrDomain_Ip{
+									Ip: []byte{127, 0, 0, 1},
+								},
+							},
+							Port: uint32(port),
+						},
+						PrioritizedDomain: []*NameServer_PriorityDomain{
+							{
+								Type:   DomainMatchingType_Full,
+								Domain: "google.com",
+							},
+						},
+					},
+				},
+			}),
+			serial.ToTypedMessage(&dispatcher.Config{}),
+			serial.ToTypedMessage(&proxyman.OutboundConfig{}),
+			serial.ToTypedMessage(&policy.Config{}),
+		},
+		Outbound: []*core.OutboundHandlerConfig{
+			{
+				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
+			},
+		},
+	}
+
+	v, err := core.New(config)
+	assert(err, IsNil)
+
+	client := v.DNSClient()
+
+	startTime := time.Now()
+	ips, err := client.LookupIP("google.com")
+	assert(err, IsNil)
+	assert(len(ips), Equals, 1)
+	assert([]byte(ips[0]), Equals, []byte{8, 8, 8, 8})
+
+	endTime := time.Now()
+	if startTime.After(endTime.Add(time.Second * 2)) {
+		t.Error("DNS query doesn't finish in 2 seconds.")
+	}
+}