support domain to domain mapping in static host

app/dns/config.pb.go

@@ -232,12 +232,15 @@ func (m *Config) GetTag() string {
 }
 
 type Config_HostMapping 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"`
-	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"`
+	// ProxiedDomain indicates the mapped domain has the same IP address on this domain. V2Ray 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"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *Config_HostMapping) Reset()         { *m = Config_HostMapping{} }
@@ -286,6 +289,13 @@ func (m *Config_HostMapping) GetIp() [][]byte {
 	return nil
 }
 
+func (m *Config_HostMapping) GetProxiedDomain() string {
+	if m != nil {
+		return m.ProxiedDomain
+	}
+	return ""
+}
+
 func init() {
 	proto.RegisterEnum("v2ray.core.app.dns.DomainMatchingType", DomainMatchingType_name, DomainMatchingType_value)
 	proto.RegisterType((*NameServer)(nil), "v2ray.core.app.dns.NameServer")
@@ -300,39 +310,40 @@ func init() {
 }
 
 var fileDescriptor_ed5695198e3def8f = []byte{
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-	0x00, 0x00,
+	// 552 bytes of a gzipped FileDescriptorProto
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 }

app/dns/config.proto

@@ -45,7 +45,12 @@ message Config {
   message HostMapping {
     DomainMatchingType type = 1;
     string domain = 2;
+
     repeated bytes ip = 3;
+
+    // ProxiedDomain indicates the mapped domain has the same IP address on this domain. V2Ray will use this domain for IP queries.
+    // This field is only effective if ip is empty.
+    string proxied_domain = 4;
   }
 
   repeated HostMapping static_hosts = 4;

app/dns/hosts.go

@@ -63,25 +63,32 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 			return nil, newError("failed to create domain matcher").Base(err)
 		}
 		id := g.Add(matcher)
-		ips := make([]net.Address, 0, len(mapping.Ip))
-		for _, ip := range mapping.Ip {
-			addr := net.IPAddress(ip)
-			if addr == nil {
-				return nil, newError("invalid IP address in static hosts: ", ip).AtWarning()
+		ips := make([]net.Address, 0, len(mapping.Ip)+1)
+		if len(mapping.Ip) > 0 {
+			for _, ip := range mapping.Ip {
+				addr := net.IPAddress(ip)
+				if addr == nil {
+					return nil, newError("invalid IP address in static hosts: ", ip).AtWarning()
+				}
+				ips = append(ips, addr)
 			}
-			ips = append(ips, addr)
+		} else if len(mapping.ProxiedDomain) > 0 {
+			ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
+		} else {
+			return nil, newError("neither IP address nor proxied domain specified for domain: ", mapping.Domain).AtWarning()
 		}
+
 		sh.ips[id] = ips
 	}
 
 	return sh, nil
 }
 
-func filterIP(ips []net.Address, option IPOption) []net.IP {
-	filtered := make([]net.IP, 0, len(ips))
+func filterIP(ips []net.Address, option 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.IP())
+			filtered = append(filtered, ip)
 		}
 	}
 	if len(filtered) == 0 {
@@ -91,10 +98,14 @@ func filterIP(ips []net.Address, option IPOption) []net.IP {
 }
 
 // LookupIP returns IP address for the given domain, if exists in this StaticHosts.
-func (h *StaticHosts) LookupIP(domain string, option IPOption) []net.IP {
+func (h *StaticHosts) LookupIP(domain string, option IPOption) []net.Address {
 	id := h.matchers.Match(domain)
 	if id == 0 {
 		return nil
 	}
-	return filterIP(h.ips[id], option)
+	ips := h.ips[id]
+	if len(ips) == 1 && ips[0].Family().IsDomain() {
+		return ips
+	}
+	return filterIP(ips, option)
 }

app/dns/hosts_test.go

@@ -38,7 +38,7 @@ func TestStaticHosts(t *testing.T) {
 		if len(ips) != 1 {
 			t.Error("expect 1 IP, but got ", len(ips))
 		}
-		if diff := cmp.Diff([]byte(ips[0]), []byte{1, 1, 1, 1}); diff != "" {
+		if diff := cmp.Diff([]byte(ips[0].IP()), []byte{1, 1, 1, 1}); diff != "" {
 			t.Error(diff)
 		}
 	}
@@ -51,7 +51,7 @@ func TestStaticHosts(t *testing.T) {
 		if len(ips) != 1 {
 			t.Error("expect 1 IP, but got ", len(ips))
 		}
-		if diff := cmp.Diff([]byte(ips[0]), []byte{2, 2, 2, 2}); diff != "" {
+		if diff := cmp.Diff([]byte(ips[0].IP()), []byte{2, 2, 2, 2}); diff != "" {
 			t.Error(diff)
 		}
 	}

app/dns/server.go

@@ -155,9 +155,40 @@ func (s *Server) LookupIPv6(domain string) ([]net.IP, error) {
 	})
 }
 
+func (s *Server) lookupStatic(domain string, option 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
+}
+
 func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, error) {
-	if ip := s.hosts.LookupIP(domain, option); len(ip) > 0 {
-		return ip, nil
+	ips := s.lookupStatic(domain, option, 0)
+	if ips != nil && ips[0].Family().IsIP() {
+		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

app/dns/server_test.go

@@ -339,3 +339,68 @@ func TestUDPServerIPv6(t *testing.T) {
 		}
 	}
 }
+
+func TestStaticHostDomain(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: uint32(port),
+					},
+				},
+				StaticHosts: []*Config_HostMapping{
+					{
+						Type:          DomainMatchingType_Full,
+						Domain:        "example.com",
+						ProxiedDomain: "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)
+	common.Must(err)
+
+	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
+
+	{
+		ips, err := client.LookupIP("example.com")
+		if err != nil {
+			t.Fatal("unexpected error: ", err)
+		}
+
+		if r := cmp.Diff(ips, []net.IP{{8, 8, 8, 8}}); r != "" {
+			t.Fatal(r)
+		}
+	}
+
+	dnsServer.Shutdown()
+}

app/dns/udpns.go

@@ -324,7 +324,7 @@ func (s *ClassicNameServer) findIPsForDomain(domain string, option IPOption) []n
 				ips = append(ips, rec.IP)
 			}
 		}
-		return filterIP(ips, option)
+		return toNetIP(filterIP(ips, option))
 	}
 	return nil
 }