Feat: add disableFallback & skipFallback option for DNS (#864)

app/dns/config.pb.go

@@ -130,6 +130,7 @@ type NameServer struct {
 
 	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"`
@@ -181,6 +182,13 @@ func (x *NameServer) GetClientIp() []byte {
 	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
@@ -226,9 +234,10 @@ 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 Disable DNS cache
-	DisableCache  bool          `protobuf:"varint,8,opt,name=disableCache,proto3" json:"disableCache,omitempty"`
-	QueryStrategy QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=v2ray.core.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
+	// DisableCache disables DNS cache
+	DisableCache    bool          `protobuf:"varint,8,opt,name=disableCache,proto3" json:"disableCache,omitempty"`
+	QueryStrategy   QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=v2ray.core.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
+	DisableFallback bool          `protobuf:"varint,10,opt,name=disableFallback,proto3" json:"disableFallback,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -321,6 +330,13 @@ func (x *Config) GetQueryStrategy() 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
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 }
 
 var (

app/dns/config.proto

@@ -13,6 +13,7 @@ import "app/router/config.proto";
 message NameServer {
   v2ray.core.common.net.Endpoint address = 1;
   bytes client_ip = 5;
+  bool skipFallback = 6;
 
   message PriorityDomain {
     DomainMatchingType type = 1;
@@ -78,8 +79,10 @@ message Config {
 
   reserved 7;
 
-  // DisableCache Disable DNS cache
+  // DisableCache disables DNS cache
   bool disableCache = 8;
 
   QueryStrategy query_strategy = 9;
+
+  bool disableFallback = 10;
 }

app/dns/dns.go

@@ -24,14 +24,15 @@ import (
 // DNS is a DNS rely server.
 type DNS struct {
 	sync.Mutex
-	tag           string
-	disableCache  bool
-	ipOption      *dns.IPOption
-	hosts         *StaticHosts
-	clients       []*Client
-	ctx           context.Context
-	domainMatcher strmatcher.IndexMatcher
-	matcherInfos  []DomainMatcherInfo
+	tag             string
+	disableCache    bool
+	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
@@ -133,14 +134,15 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
 	}
 
 	return &DNS{
-		tag:           tag,
-		hosts:         hosts,
-		ipOption:      ipOption,
-		clients:       clients,
-		ctx:           ctx,
-		domainMatcher: domainMatcher,
-		matcherInfos:  matcherInfos,
-		disableCache:  config.DisableCache,
+		tag:             tag,
+		hosts:           hosts,
+		ipOption:        ipOption,
+		clients:         clients,
+		ctx:             ctx,
+		domainMatcher:   domainMatcher,
+		matcherInfos:    matcherInfos,
+		disableCache:    config.DisableCache,
+		disableFallback: config.DisableFallback,
 	}, nil
 }
 
@@ -276,14 +278,16 @@ func (s *DNS) sortClients(domain string) []*Client {
 		clientNames = append(clientNames, client.Name())
 	}
 
-	// Default round-robin query
-	for idx, client := range s.clients {
-		if clientUsed[idx] {
-			continue
+	if !s.disableFallback {
+		// Default round-robin query
+		for idx, client := range s.clients {
+			if clientUsed[idx] || client.skipFallback {
+				continue
+			}
+			clientUsed[idx] = true
+			clients = append(clients, client)
+			clientNames = append(clientNames, client.Name())
 		}
-		clientUsed[idx] = true
-		clients = append(clients, client)
-		clientNames = append(clientNames, client.Name())
 	}
 
 	if len(domainRules) > 0 {
@@ -292,6 +296,13 @@ func (s *DNS) sortClients(domain string) []*Client {
 	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()
+	}
+
 	return clients
 }
 

app/dns/nameserver.go

@@ -27,10 +27,11 @@ type Server interface {
 
 // Client is the interface for DNS client.
 type Client struct {
-	server    Server
-	clientIP  net.IP
-	domains   []string
-	expectIPs []*router.GeoIPMatcher
+	server       Server
+	clientIP     net.IP
+	skipFallback bool
+	domains      []string
+	expectIPs    []*router.GeoIPMatcher
 }
 
 var errExpectedIPNonMatch = errors.New("expectIPs not match")
@@ -67,6 +68,7 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err
 // NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs.
 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)
@@ -144,6 +146,7 @@ func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container r
 
 		client.server = server
 		client.clientIP = clientIP
+		client.skipFallback = ns.SkipFallback
 		client.domains = rules
 		client.expectIPs = matchers
 		return nil

infra/conf/dns.go

@@ -11,11 +11,12 @@ import (
 )
 
 type NameServerConfig struct {
-	Address   *Address
-	ClientIP  *Address
-	Port      uint16
-	Domains   []string
-	ExpectIPs StringList
+	Address      *Address
+	ClientIP     *Address
+	Port         uint16
+	SkipFallback bool
+	Domains      []string
+	ExpectIPs    StringList
 }
 
 func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
@@ -26,16 +27,18 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 	}
 
 	var advanced struct {
-		Address   *Address   `json:"address"`
-		ClientIP  *Address   `json:"clientIp"`
-		Port      uint16     `json:"port"`
-		Domains   []string   `json:"domains"`
-		ExpectIPs StringList `json:"expectIps"`
+		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
@@ -105,6 +108,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 			Port:    uint32(c.Port),
 		},
 		ClientIp:          myClientIP,
+		SkipFallback:      c.SkipFallback,
 		PrioritizedDomain: domains,
 		Geoip:             geoipList,
 		OriginalRules:     originalRules,
@@ -120,12 +124,13 @@ 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]*Address `json:"hosts"`
-	ClientIP      *Address            `json:"clientIp"`
-	Tag           string              `json:"tag"`
-	QueryStrategy string              `json:"queryStrategy"`
-	DisableCache  bool                `json:"disableCache"`
+	Servers         []*NameServerConfig `json:"servers"`
+	Hosts           map[string]*Address `json:"hosts"`
+	ClientIP        *Address            `json:"clientIp"`
+	Tag             string              `json:"tag"`
+	QueryStrategy   string              `json:"queryStrategy"`
+	DisableCache    bool                `json:"disableCache"`
+	DisableFallback bool                `json:"disableFallback"`
 }
 
 func getHostMapping(addr *Address) *dns.Config_HostMapping {
@@ -142,8 +147,9 @@ func getHostMapping(addr *Address) *dns.Config_HostMapping {
 // Build implements Buildable
 func (c *DNSConfig) Build() (*dns.Config, error) {
 	config := &dns.Config{
-		Tag:          c.Tag,
-		DisableCache: c.DisableCache,
+		Tag:             c.Tag,
+		DisableCache:    c.DisableCache,
+		DisableFallback: c.DisableFallback,
 	}
 
 	if c.ClientIP != nil {

infra/conf/dns_test.go

@@ -64,6 +64,7 @@ func TestDNSConfigParsing(t *testing.T) {
 					"address": "8.8.8.8",
 					"clientIp": "10.0.0.1",
 					"port": 5353,
+					"skipFallback": true,
 					"domains": ["domain:v2fly.org"]
 				}],
 				"hosts": {
@@ -75,7 +76,8 @@ func TestDNSConfigParsing(t *testing.T) {
 				},
 				"clientIp": "10.0.0.1",
 				"queryStrategy": "UseIPv4",
-				"disableCache": true
+				"disableCache": true,
+				"disableFallback": true
 			}`,
 			Parser: parserCreator(),
 			Output: &dns.Config{
@@ -90,7 +92,8 @@ func TestDNSConfigParsing(t *testing.T) {
 							Network: net.Network_UDP,
 							Port:    5353,
 						},
-						ClientIp: []byte{10, 0, 0, 1},
+						ClientIp:     []byte{10, 0, 0, 1},
+						SkipFallback: true,
 						PrioritizedDomain: []*dns.NameServer_PriorityDomain{
 							{
 								Type:   dns.DomainMatchingType_Subdomain,
@@ -132,9 +135,10 @@ func TestDNSConfigParsing(t *testing.T) {
 						Ip:     [][]byte{{127, 0, 0, 1}},
 					},
 				},
-				ClientIp:      []byte{10, 0, 0, 1},
-				QueryStrategy: dns.QueryStrategy_USE_IP4,
-				DisableCache:  true,
+				ClientIp:        []byte{10, 0, 0, 1},
+				QueryStrategy:   dns.QueryStrategy_USE_IP4,
+				DisableCache:    true,
+				DisableFallback: true,
 			},
 		},
 	})