feat: add fake-ip-filter-mode in dns

#1479

component/fakeip/pool.go

@@ -36,6 +36,7 @@ type Pool struct {
 	cycle   bool
 	mux     sync.Mutex
 	host    []C.DomainMatcher
+	mode    C.FilterMode
 	ipnet   netip.Prefix
 	store   store
 }
@@ -66,6 +67,14 @@ func (p *Pool) LookBack(ip netip.Addr) (string, bool) {
 
 // ShouldSkipped return if domain should be skipped
 func (p *Pool) ShouldSkipped(domain string) bool {
+	should := p.shouldSkipped(domain)
+	if p.mode == C.FilterWhiteList {
+		return !should
+	}
+	return should
+}
+
+func (p *Pool) shouldSkipped(domain string) bool {
 	for _, matcher := range p.host {
 		if matcher.MatchDomain(domain) {
 			return true
@@ -157,6 +166,7 @@ func (p *Pool) restoreState() {
 type Options struct {
 	IPNet netip.Prefix
 	Host  []C.DomainMatcher
+	Mode  C.FilterMode
 
 	// Size sets the maximum number of entries in memory
 	// and does not work if Persistence is true
@@ -187,6 +197,7 @@ func New(options Options) (*Pool, error) {
 		offset:  first.Prev(),
 		cycle:   false,
 		host:    options.Host,
+		mode:    options.Mode,
 		ipnet:   options.IPNet,
 	}
 	if options.Persistence {

component/fakeip/pool_test.go

@@ -164,6 +164,28 @@ func TestPool_Skip(t *testing.T) {
 	for _, pool := range pools {
 		assert.True(t, pool.ShouldSkipped("example.com"))
 		assert.False(t, pool.ShouldSkipped("foo.com"))
+		assert.False(t, pool.shouldSkipped("baz.com"))
+	}
+}
+
+func TestPool_SkipWhiteList(t *testing.T) {
+	ipnet := netip.MustParsePrefix("192.168.0.1/29")
+	tree := trie.New[struct{}]()
+	assert.NoError(t, tree.Insert("example.com", struct{}{}))
+	assert.False(t, tree.IsEmpty())
+	pools, tempfile, err := createPools(Options{
+		IPNet: ipnet,
+		Size:  10,
+		Host:  []C.DomainMatcher{tree.NewDomainSet()},
+		Mode:  C.FilterWhiteList,
+	})
+	assert.Nil(t, err)
+	defer os.Remove(tempfile)
+
+	for _, pool := range pools {
+		assert.False(t, pool.ShouldSkipped("example.com"))
+		assert.True(t, pool.ShouldSkipped("foo.com"))
+		assert.True(t, pool.ShouldSkipped("baz.com"))
 	}
 }
 

config/config.go

@@ -205,6 +205,7 @@ type RawDNS struct {
 	EnhancedMode          C.DNSMode                           `yaml:"enhanced-mode" json:"enhanced-mode"`
 	FakeIPRange           string                              `yaml:"fake-ip-range" json:"fake-ip-range"`
 	FakeIPFilter          []string                            `yaml:"fake-ip-filter" json:"fake-ip-filter"`
+	FakeIPFilterMode      C.FilterMode                        `yaml:"fake-ip-filter-mode" json:"fake-ip-filter-mode"`
 	DefaultNameserver     []string                            `yaml:"default-nameserver" json:"default-nameserver"`
 	CacheAlgorithm        string                              `yaml:"cache-algorithm" json:"cache-algorithm"`
 	NameServerPolicy      *orderedmap.OrderedMap[string, any] `yaml:"nameserver-policy" json:"nameserver-policy"`
@@ -474,6 +475,7 @@ func DefaultRawConfig() *RawConfig {
 				"www.msftnsci.com",
 				"www.msftconnecttest.com",
 			},
+			FakeIPFilterMode: C.FilterBlackList,
 		},
 		NTP: RawNTP{
 			Enable:        false,
@@ -1458,6 +1460,7 @@ func parseDNS(rawCfg *RawConfig, hosts *trie.DomainTrie[resolver.HostValue], rul
 			IPNet:       fakeIPRange,
 			Size:        1000,
 			Host:        host,
+			Mode:        cfg.FakeIPFilterMode,
 			Persistence: rawCfg.Profile.StoreFakeIP,
 		})
 		if err != nil {

constant/dns.go

@@ -43,7 +43,9 @@ func (e DNSMode) MarshalYAML() (any, error) {
 // UnmarshalJSON unserialize EnhancedMode with json
 func (e *DNSMode) UnmarshalJSON(data []byte) error {
 	var tp string
-	json.Unmarshal(data, &tp)
+	if err := json.Unmarshal(data, &tp); err != nil {
+		return err
+	}
 	mode, exist := DNSModeMapping[tp]
 	if !exist {
 		return errors.New("invalid mode")
@@ -115,6 +117,64 @@ func NewDNSPrefer(prefer string) DNSPrefer {
 	}
 }
 
+// FilterModeMapping is a mapping for FilterMode enum
+var FilterModeMapping = map[string]FilterMode{
+	FilterBlackList.String(): FilterBlackList,
+	FilterWhiteList.String(): FilterWhiteList,
+}
+
+type FilterMode int
+
+const (
+	FilterBlackList FilterMode = iota
+	FilterWhiteList
+)
+
+func (e FilterMode) String() string {
+	switch e {
+	case FilterBlackList:
+		return "blacklist"
+	case FilterWhiteList:
+		return "whitelist"
+	default:
+		return "unknown"
+	}
+}
+
+func (e FilterMode) MarshalYAML() (interface{}, error) {
+	return e.String(), nil
+}
+
+func (e *FilterMode) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var tp string
+	if err := unmarshal(&tp); err != nil {
+		return err
+	}
+	mode, exist := FilterModeMapping[tp]
+	if !exist {
+		return errors.New("invalid mode")
+	}
+	*e = mode
+	return nil
+}
+
+func (e FilterMode) MarshalJSON() ([]byte, error) {
+	return json.Marshal(e.String())
+}
+
+func (e *FilterMode) UnmarshalJSON(data []byte) error {
+	var tp string
+	if err := json.Unmarshal(data, &tp); err != nil {
+		return err
+	}
+	mode, exist := FilterModeMapping[tp]
+	if !exist {
+		return errors.New("invalid mode")
+	}
+	*e = mode
+	return nil
+}
+
 type HTTPVersion string
 
 const (

docs/config.yaml

@@ -249,6 +249,9 @@ dns:
     - rule-set:fakeip-filter
     # fakeip-filter 为 geosite 中名为 fakeip-filter 的分类（需要自行保证该分类存在）
     - geosite:fakeip-filter
+  # 配置fake-ip-filter的匹配模式，默认为blacklist，即如果匹配成功不返回fake-ip
+  # 可设置为whitelist，即只有匹配成功才返回fake-ip
+  fake-ip-filter-mode: blacklist
 
   # use-hosts: true # 查询 hosts