clash/dns/enhancer.go

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package dns
import (
"net"
"github.com/Dreamacro/clash/common/cache"
"github.com/Dreamacro/clash/component/fakeip"
)
type ResolverEnhancer struct {
mode EnhancedMode
fakePool *fakeip.Pool
mapping *cache.LruCache
}
func (h *ResolverEnhancer) FakeIPEnabled() bool {
return h.mode == FAKEIP
}
func (h *ResolverEnhancer) MappingEnabled() bool {
return h.mode == FAKEIP || h.mode == MAPPING
}
func (h *ResolverEnhancer) IsExistFakeIP(ip net.IP) bool {
if !h.FakeIPEnabled() {
return false
}
if pool := h.fakePool; pool != nil {
return pool.Exist(ip)
}
return false
}
func (h *ResolverEnhancer) IsFakeIP(ip net.IP) bool {
if !h.FakeIPEnabled() {
return false
}
if pool := h.fakePool; pool != nil {
return pool.IPNet().Contains(ip) && !pool.Gateway().Equal(ip)
}
return false
}
func (h *ResolverEnhancer) FindHostByIP(ip net.IP) (string, bool) {
if pool := h.fakePool; pool != nil {
if host, existed := pool.LookBack(ip); existed {
return host, true
}
}
if mapping := h.mapping; mapping != nil {
if host, existed := h.mapping.Get(ip.String()); existed {
return host.(string), true
}
}
return "", false
}
func (h *ResolverEnhancer) PatchFrom(o *ResolverEnhancer) {
if h.mapping != nil && o.mapping != nil {
o.mapping.CloneTo(h.mapping)
}
if h.fakePool != nil && o.fakePool != nil {
h.fakePool.PatchFrom(o.fakePool)
}
}
func NewEnhancer(cfg Config) *ResolverEnhancer {
var fakePool *fakeip.Pool
var mapping *cache.LruCache
if cfg.EnhancedMode != NORMAL {
fakePool = cfg.Pool
mapping = cache.NewLRUCache(cache.WithSize(4096), cache.WithStale(true))
}
return &ResolverEnhancer{
mode: cfg.EnhancedMode,
fakePool: fakePool,
mapping: mapping,
}
}