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

https://github.com/MetaCubeX/mihomo/issues/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"))
 	}
 }