Add fakeip support

transport/fakeip/memory.go

@@ -0,0 +1,44 @@
+package fakeip
+
+import (
+	"net/netip"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing/common/cache"
+)
+
+var _ adapter.FakeIPStorage = (*MemoryStorage)(nil)
+
+type MemoryStorage struct {
+	metadata    *adapter.FakeIPMetadata
+	domainCache *cache.LruCache[netip.Addr, string]
+}
+
+func NewMemoryStorage() *MemoryStorage {
+	return &MemoryStorage{
+		domainCache: cache.New[netip.Addr, string](),
+	}
+}
+
+func (s *MemoryStorage) FakeIPMetadata() *adapter.FakeIPMetadata {
+	return s.metadata
+}
+
+func (s *MemoryStorage) FakeIPSaveMetadata(metadata *adapter.FakeIPMetadata) error {
+	s.metadata = metadata
+	return nil
+}
+
+func (s *MemoryStorage) FakeIPStore(address netip.Addr, domain string) error {
+	s.domainCache.Store(address, domain)
+	return nil
+}
+
+func (s *MemoryStorage) FakeIPLoad(address netip.Addr) (string, bool) {
+	return s.domainCache.Load(address)
+}
+
+func (s *MemoryStorage) FakeIPReset() error {
+	s.domainCache = cache.New[netip.Addr, string]()
+	return nil
+}