add ip match feature for dns

app/dns/config.pb.go

@@ -4,6 +4,7 @@ import (
 	fmt "fmt"
 	proto "github.com/golang/protobuf/proto"
 	math "math"
+	router "v2ray.com/core/app/router"
 	net "v2ray.com/core/common/net"
 )
 
@@ -52,6 +53,7 @@ func (DomainMatchingType) EnumDescriptor() ([]byte, []int) {
 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"`
+	Geoip                []*router.GeoIP              `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                     `json:"-"`
 	XXX_unrecognized     []byte                       `json:"-"`
 	XXX_sizecache        int32                        `json:"-"`
@@ -96,6 +98,13 @@ func (m *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain {
 	return nil
 }
 
+func (m *NameServer) GetGeoip() []*router.GeoIP {
+	if m != nil {
+		return m.Geoip
+	}
+	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"`
@@ -310,40 +319,42 @@ func init() {
 }
 
 var fileDescriptor_ed5695198e3def8f = []byte{
-	// 552 bytes of a gzipped FileDescriptorProto
+	// 583 bytes of a gzipped FileDescriptorProto
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-	0x15, 0xed, 0x7b, 0x41, 0x68, 0x04, 0x00, 0x00,
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+	0xe1, 0x7d, 0x51, 0x1c, 0x35, 0xed, 0xbf, 0xe0, 0xc1, 0xcf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x4c,
+	0x2a, 0x66, 0x8a, 0xc4, 0x04, 0x00, 0x00,
 }

app/dns/config.proto

@@ -8,6 +8,7 @@ option java_multiple_files = true;
 
 import "v2ray.com/core/common/net/address.proto";
 import "v2ray.com/core/common/net/destination.proto";
+import "v2ray.com/core/app/router/config.proto";
 
 message NameServer {
   v2ray.core.common.net.Endpoint address = 1;
@@ -18,6 +19,7 @@ message NameServer {
   }
 
   repeated PriorityDomain prioritized_domain = 2;
+  repeated v2ray.core.app.router.GeoIP geoip = 3;
 }
 
 enum DomainMatchingType {

app/dns/server.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"v2ray.com/core"
+	"v2ray.com/core/app/router"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/session"
@@ -28,9 +29,33 @@ type Server struct {
 	clientIP       net.IP
 	domainMatcher  strmatcher.IndexMatcher
 	domainIndexMap map[uint32]uint32
+	ipIndexMap     map[uint32]*MultiGeoIPMatcher
 	tag            string
 }
 
+// MultiGeoIPMatcher for match
+type MultiGeoIPMatcher struct {
+	matchers []*router.GeoIPMatcher
+}
+
+// Match for
+func (c *MultiGeoIPMatcher) Match(ip net.IP) bool {
+	for _, matcher := range c.matchers {
+		if matcher.Match(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// HasMatcher f
+func (c *MultiGeoIPMatcher) HasMatcher() bool {
+	if len(c.matchers) > 0 {
+		return true
+	}
+	return false
+}
+
 func generateRandomTag() string {
 	id := uuid.New()
 	return "v2ray.system." + id.String()
@@ -87,9 +112,12 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 		addNameServer(destPB)
 	}
 
+	var geoIPMatcherContainer router.GeoIPMatcherContainer
+
 	if len(config.NameServer) > 0 {
 		domainMatcher := &strmatcher.MatcherGroup{}
 		domainIndexMap := make(map[uint32]uint32)
+		ipIndexMap := make(map[uint32]*MultiGeoIPMatcher)
 
 		for _, ns := range config.NameServer {
 			idx := addNameServer(ns.Address)
@@ -102,10 +130,23 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 				midx := domainMatcher.Add(matcher)
 				domainIndexMap[midx] = uint32(idx)
 			}
+
+			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}
+			ipIndexMap[uint32(idx)] = matcher
 		}
 
 		server.domainMatcher = domainMatcher
 		server.domainIndexMap = domainIndexMap
+		server.ipIndexMap = ipIndexMap
 	}
 
 	if len(server.clients) == 0 {
@@ -135,7 +176,40 @@ func (s *Server) IsOwnLink(ctx context.Context) bool {
 	return inbound != nil && inbound.Tag == s.tag
 }
 
-func (s *Server) queryIPTimeout(client Client, domain string, option IPOption) ([]net.IP, error) {
+// Match check dns ip match geoip
+func (s *Server) Match(idx uint32, client Client, domain string, ips []net.IP) ([]net.IP, error) {
+	if len(ips) == 0 {
+		newError("domain ", domain, " has empty response at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
+		return nil, context.Canceled
+	}
+
+	matcher, exist := s.ipIndexMap[idx]
+	if exist == false {
+		newError("domain ", domain, " server not in ipIndexMap: ", client.Name(), " idx:", idx, " just return").AtDebug().WriteToLog()
+		return ips, nil
+	}
+
+	if matcher.HasMatcher() == false {
+		newError("domain ", domain, "server has not valid matcher: ", client.Name(), " idx:", idx, " just return").AtDebug().WriteToLog()
+		return ips, nil
+	}
+
+	newIps := []net.IP{}
+	for _, ip := range ips {
+		if matcher.Match(ip) {
+			newIps = append(newIps, ip)
+			newError("domain ", domain, " ip ", ip, " is match at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
+		} else {
+			newError("domain ", domain, " ip ", ip, " is not match at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
+		}
+	}
+	if len(newIps) == 0 {
+		return nil, context.Canceled
+	}
+	return newIps, nil
+}
+
+func (s *Server) queryIPTimeout(idx uint32, client Client, domain string, option IPOption) ([]net.IP, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
 	if len(s.tag) > 0 {
 		ctx = session.ContextWithInbound(ctx, &session.Inbound{
@@ -143,6 +217,7 @@ func (s *Server) queryIPTimeout(client Client, domain string, option IPOption) (
 		})
 	}
 	ips, err := client.QueryIP(ctx, domain, option)
+	ips, err = s.Match(idx, client, domain, ips)
 	cancel()
 	return ips, err
 }
@@ -221,8 +296,8 @@ func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, err
 		idx := s.domainMatcher.Match(domain)
 		if idx > 0 {
 			ns := s.clients[s.domainIndexMap[idx]]
-			newError("querying domain ", domain, " at ", ns.Name()).WriteToLog()
+			newError("domain matched, direct lookup ip for domain ", domain, " at ", ns.Name()).WriteToLog()
-			ips, err := s.queryIPTimeout(ns, domain, option)
+			ips, err := s.queryIPTimeout(s.domainIndexMap[idx], ns, domain, option)
 			if len(ips) > 0 {
 				return ips, nil
 			}
@@ -236,11 +311,15 @@ func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, err
 		}
 	}
 
-	for _, client := range s.clients {
+	for idx, client := range s.clients {
-		ips, err := s.queryIPTimeout(client, domain, option)
+		newError("try to lookup ip for domain ", domain, " at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
+
+		ips, err := s.queryIPTimeout(uint32(idx), client, domain, option)
 		if len(ips) > 0 {
+			newError("lookup ip for domain ", domain, " success: ", ips, " at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
 			return ips, nil
 		}
+
 		if err != nil {
 			newError("failed to lookup ip for domain ", domain, " at server ", client.Name()).Base(err).WriteToLog()
 			lastErr = err

app/dns/server_test.go

@@ -13,6 +13,7 @@ import (
 	"v2ray.com/core/app/policy"
 	"v2ray.com/core/app/proxyman"
 	_ "v2ray.com/core/app/proxyman/outbound"
+	"v2ray.com/core/app/router"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/serial"
@@ -426,3 +427,124 @@ func TestStaticHostDomain(t *testing.T) {
 
 	dnsServer.Shutdown()
 }
+
+func TestIPMatch(t *testing.T) {
+	port := udp.PickPort()
+
+	dnsServer := dns.Server{
+		Addr:    "127.0.0.1:" + port.String(),
+		Net:     "udp",
+		Handler: &staticHandler{},
+		UDPSize: 1200,
+	}
+
+	go dnsServer.ListenAndServe()
+	time.Sleep(time.Second)
+
+	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{
+					// private dns, not match
+					{
+						Address: &net.Endpoint{
+							Network: net.Network_UDP,
+							Address: &net.IPOrDomain{
+								Address: &net.IPOrDomain_Ip{
+									Ip: []byte{127, 0, 0, 1},
+								},
+							},
+							Port: uint32(port),
+						},
+						Geoip: []*router.GeoIP{
+							{
+								CountryCode: "local",
+								Cidr: []*router.CIDR{
+									{
+										// inner ip, will not match
+										Ip:     []byte{192, 168, 11, 1},
+										Prefix: 32,
+									},
+								},
+							},
+						},
+					},
+					// second dns, match ip
+					{
+						Address: &net.Endpoint{
+							Network: net.Network_UDP,
+							Address: &net.IPOrDomain{
+								Address: &net.IPOrDomain_Ip{
+									Ip: []byte{127, 0, 0, 1},
+								},
+							},
+							Port: uint32(port),
+						},
+						Geoip: []*router.GeoIP{
+							{
+								CountryCode: "test",
+								Cidr: []*router.CIDR{
+									{
+										Ip:     []byte{8, 8, 8, 8},
+										Prefix: 32,
+									},
+								},
+							},
+							{
+								CountryCode: "test",
+								Cidr: []*router.CIDR{
+									{
+										Ip:     []byte{8, 8, 8, 4},
+										Prefix: 32,
+									},
+								},
+							},
+						},
+					},
+				},
+			}),
+			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)
+	common.Must(err)
+
+	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
+
+	startTime := time.Now()
+
+	{
+		ips, err := client.LookupIP("google.com")
+		if err != nil {
+			t.Fatal("unexpected error: ", err)
+		}
+
+		if r := cmp.Diff(ips, []net.IP{{8, 8, 8, 8}}); r != "" {
+			t.Fatal(r)
+		}
+	}
+
+	endTime := time.Now()
+	if startTime.After(endTime.Add(time.Second * 2)) {
+		t.Error("DNS query doesn't finish in 2 seconds.")
+	}
+}

infra/conf/dns.go

@@ -14,6 +14,7 @@ type NameServerConfig struct {
 	Address *Address
 	Port    uint16
 	Domains []string
+	IP      StringList
 }
 
 func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
@@ -28,11 +29,13 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 		Address *Address   `json:"address"`
 		Port    uint16     `json:"port"`
 		Domains []string   `json:"domains"`
+		IP      StringList `json:"ip"`
 	}
 	if err := json.Unmarshal(data, &advanced); err == nil {
 		c.Address = advanced.Address
 		c.Port = advanced.Port
 		c.Domains = advanced.Domains
+		c.IP = advanced.IP
 		return nil
 	}
 
@@ -75,6 +78,11 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 		}
 	}
 
+	geoipList, err := toCidrList(c.IP)
+	if err != nil {
+		return nil, newError("invalid ip rule: ", c.IP).Base(err)
+	}
+
 	return &dns.NameServer{
 		Address: &net.Endpoint{
 			Network: net.Network_UDP,
@@ -82,6 +90,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 			Port:    uint32(c.Port),
 		},
 		PrioritizedDomain: domains,
+		Geoip:             geoipList,
 	}, nil
 }