Add disableFallbackIfMatch dns option

app/dns/config.pb.go

@@ -235,9 +235,10 @@ type Config struct {
 	// Tag is the inbound tag of DNS client.
 	Tag string `protobuf:"bytes,6,opt,name=tag,proto3" json:"tag,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"`
+	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"`
+	DisableFallbackIfMatch bool          `protobuf:"varint,11,opt,name=disableFallbackIfMatch,proto3" json:"disableFallbackIfMatch,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -337,6 +338,13 @@ func (x *Config) GetDisableFallback() bool {
 	return false
 }
 
+func (x *Config) GetDisableFallbackIfMatch() bool {
+	if x != nil {
+		return x.DisableFallbackIfMatch
+	}
+	return false
+}
+
 type NameServer_PriorityDomain struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -563,7 +571,7 @@ var file_app_dns_config_proto_rawDesc = []byte{
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@@ -594,36 +602,40 @@ var file_app_dns_config_proto_rawDesc = []byte{
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 }
 
 var (

app/dns/config.proto

@@ -84,4 +84,5 @@ message Config {
   QueryStrategy query_strategy = 9;
 
   bool disableFallback = 10;
+  bool disableFallbackIfMatch = 11;
 }

app/dns/dns.go

@@ -25,15 +25,16 @@ import (
 // DNS is a DNS rely server.
 type DNS struct {
 	sync.Mutex
-	tag             string
-	disableCache    bool
-	disableFallback bool
-	ipOption        *dns.IPOption
-	hosts           *StaticHosts
-	clients         []*Client
-	ctx             context.Context
-	domainMatcher   strmatcher.IndexMatcher
-	matcherInfos    []*DomainMatcherInfo
+	tag                    string
+	disableCache           bool
+	disableFallback        bool
+	disableFallbackIfMatch 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
@@ -135,15 +136,16 @@ 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,
-		disableFallback: config.DisableFallback,
+		tag:                    tag,
+		hosts:                  hosts,
+		ipOption:               ipOption,
+		clients:                clients,
+		ctx:                    ctx,
+		domainMatcher:          domainMatcher,
+		matcherInfos:           matcherInfos,
+		disableCache:           config.DisableCache,
+		disableFallback:        config.DisableFallback,
+		disableFallbackIfMatch: config.DisableFallbackIfMatch,
 	}, nil
 }
 
@@ -264,6 +266,7 @@ func (s *DNS) sortClients(domain string) []*Client {
 	domainRules := []string{}
 
 	// Priority domain matching
+	hasMatch := false
 	for _, match := range s.domainMatcher.Match(domain) {
 		info := s.matcherInfos[match]
 		client := s.clients[info.clientIdx]
@@ -275,9 +278,10 @@ func (s *DNS) sortClients(domain string) []*Client {
 		clientUsed[info.clientIdx] = true
 		clients = append(clients, client)
 		clientNames = append(clientNames, client.Name())
+		hasMatch = true
 	}
 
-	if !s.disableFallback {
+	if !(s.disableFallback || s.disableFallbackIfMatch && hasMatch) {
 		// Default round-robin query
 		for idx, client := range s.clients {
 			if clientUsed[idx] || client.skipFallback {

infra/conf/dns.go

@@ -133,13 +133,14 @@ 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]*HostAddress `json:"hosts"`
-	ClientIP        *cfgcommon.Address      `json:"clientIp"`
-	Tag             string                  `json:"tag"`
-	QueryStrategy   string                  `json:"queryStrategy"`
-	DisableCache    bool                    `json:"disableCache"`
-	DisableFallback bool                    `json:"disableFallback"`
+	Servers                []*NameServerConfig     `json:"servers"`
+	Hosts                  map[string]*HostAddress `json:"hosts"`
+	ClientIP               *cfgcommon.Address      `json:"clientIp"`
+	Tag                    string                  `json:"tag"`
+	QueryStrategy          string                  `json:"queryStrategy"`
+	DisableCache           bool                    `json:"disableCache"`
+	DisableFallback        bool                    `json:"disableFallback"`
+	DisableFallbackIfMatch bool                    `json:"disableFallbackIfMatch"`
 }
 
 type HostAddress struct {
@@ -206,9 +207,10 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
 	geoLoader := cfgEnv.GetGeoLoader()
 
 	config := &dns.Config{
-		Tag:             c.Tag,
-		DisableCache:    c.DisableCache,
-		DisableFallback: c.DisableFallback,
+		Tag:                    c.Tag,
+		DisableCache:           c.DisableCache,
+		DisableFallback:        c.DisableFallback,
+		DisableFallbackIfMatch: c.DisableFallbackIfMatch,
 	}
 
 	if c.ClientIP != nil {