chore: add fake-ip-ttl to dns section

config/config.go

@@ -162,6 +162,7 @@ type DNS struct {
 	FakeIPRange6          netip.Prefix
 	FakeIPPool6           *fakeip.Pool
 	FakeIPSkipper         *fakeip.Skipper
+	FakeIPTTL             int
 	NameServerPolicy      []dns.Policy
 	ProxyServerNameserver []dns.NameServer
 	DirectNameServer      []dns.NameServer
@@ -228,6 +229,7 @@ type RawDNS struct {
 	FakeIPRange6                 string                              `yaml:"fake-ip-range6" json:"fake-ip-range6"`
 	FakeIPFilter                 []string                            `yaml:"fake-ip-filter" json:"fake-ip-filter"`
 	FakeIPFilterMode             C.FilterMode                        `yaml:"fake-ip-filter-mode" json:"fake-ip-filter-mode"`
+	FakeIPTTL                    int                                 `yaml:"fake-ip-ttl" json:"fake-ip-ttl"`
 	DefaultNameserver            []string                            `yaml:"default-nameserver" json:"default-nameserver"`
 	CacheAlgorithm               string                              `yaml:"cache-algorithm" json:"cache-algorithm"`
 	CacheMaxSize                 int                                 `yaml:"cache-max-size" json:"cache-max-size"`
@@ -490,6 +492,7 @@ func DefaultRawConfig() *RawConfig {
 			IPv6Timeout:    100,
 			EnhancedMode:   C.DNSMapping,
 			FakeIPRange:    "198.18.0.1/16",
+			FakeIPTTL:      1,
 			FallbackFilter: RawFallbackFilter{
 				GeoIP:     true,
 				GeoIPCode: "CN",
@@ -1458,6 +1461,7 @@ func parseDNS(rawCfg *RawConfig, ruleProviders map[string]P.RuleProvider) (*DNS,
 			Mode: cfg.FakeIPFilterMode,
 		}
 		dnsCfg.FakeIPSkipper = skipper
+		dnsCfg.FakeIPTTL = cfg.FakeIPTTL
 
 		if dnsCfg.FakeIPRange.IsValid() {
 			pool, err := fakeip.New(fakeip.Options{

dns/enhancer.go

@@ -14,6 +14,7 @@ type ResolverEnhancer struct {
 	fakeIPPool    *fakeip.Pool
 	fakeIPPool6   *fakeip.Pool
 	fakeIPSkipper *fakeip.Skipper
+	fakeIPTTL     int
 	mapping       *lru.LruCache[netip.Addr, string]
 	useHosts      bool
 }
@@ -162,6 +163,7 @@ type EnhancerConfig struct {
 	FakeIPPool    *fakeip.Pool
 	FakeIPPool6   *fakeip.Pool
 	FakeIPSkipper *fakeip.Skipper
+	FakeIPTTL     int
 	UseHosts      bool
 }
 
@@ -177,6 +179,10 @@ func NewEnhancer(cfg EnhancerConfig) *ResolverEnhancer {
 			e.fakeIPPool6 = cfg.FakeIPPool6
 		}
 		e.fakeIPSkipper = cfg.FakeIPSkipper
+		e.fakeIPTTL = cfg.FakeIPTTL
+		if e.fakeIPTTL < 1 {
+			e.fakeIPTTL = 1
+		}
 		e.mapping = lru.New(lru.WithSize[netip.Addr, string](4096))
 	}
 

dns/middleware.go

@@ -146,7 +146,7 @@ func withMapping(mapping *lru.LruCache[netip.Addr, string]) middleware {
 	}
 }
 
-func withFakeIP(skipper *fakeip.Skipper, fakePool *fakeip.Pool, fakePool6 *fakeip.Pool) middleware {
+func withFakeIP(skipper *fakeip.Skipper, fakePool *fakeip.Pool, fakePool6 *fakeip.Pool, fakeIPTTL int) middleware {
 	return func(next handler) handler {
 		return func(ctx *icontext.DNSContext, r *D.Msg) (*D.Msg, error) {
 			q := r.Question[0]
@@ -186,7 +186,7 @@ func withFakeIP(skipper *fakeip.Skipper, fakePool *fakeip.Pool, fakePool6 *fakei
 			msg.Answer = []D.RR{rr}
 
 			ctx.SetType(icontext.DNSTypeFakeIP)
-			setMsgTTL(msg, 1)
+			setMsgTTL(msg, uint32(fakeIPTTL))
 			msg.SetRcode(r, D.RcodeSuccess)
 			msg.Authoritative = true
 			msg.RecursionAvailable = true
@@ -238,7 +238,7 @@ func newHandler(resolver *Resolver, mapper *ResolverEnhancer) handler {
 	}
 
 	if mapper.mode == C.DNSFakeIP {
-		middlewares = append(middlewares, withFakeIP(mapper.fakeIPSkipper, mapper.fakeIPPool, mapper.fakeIPPool6))
+		middlewares = append(middlewares, withFakeIP(mapper.fakeIPSkipper, mapper.fakeIPPool, mapper.fakeIPPool6, mapper.fakeIPTTL))
 	}
 
 	if mapper.mode != C.DNSNormal {

docs/config.yaml

@@ -275,6 +275,8 @@ dns:
   # 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
+  # 配置fakeip查询返回的TTL，非必要情况下请勿修改
+  fake-ip-ttl: 1
 
   # use-hosts: true # 查询 hosts
 

hub/executor/executor.go

@@ -269,6 +269,7 @@ func updateDNS(c *config.DNS, generalIPv6 bool) {
 		FakeIPPool:    c.FakeIPPool,
 		FakeIPPool6:   c.FakeIPPool6,
 		FakeIPSkipper: c.FakeIPSkipper,
+		FakeIPTTL:     c.FakeIPTTL,
 		UseHosts:      c.UseHosts,
 	})