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https://github.com/SagerNet/sing-box.git
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Add dns reverse mapping
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parent
c74d3a53d4
commit
52b776b561
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@ -10,7 +10,8 @@
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"final": "",
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"strategy": "",
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"disable_cache": false,
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"disable_expire": false
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"disable_expire": false,
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"reverse_mapping": false
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}
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}
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@ -43,4 +44,10 @@ Disable dns cache.
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#### disable_expire
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Disable dns cache expire.
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Disable dns cache expire.
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#### reverse_mapping
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Stores a reverse mapping of IP addresses after responding to a DNS query in order to provide domain names when routing.
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Since this process relies on the act of resolving domain names by an application before making a request, it can be problematic in environments such as macOS, where DNS is proxied and cached by the system.
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@ -10,7 +10,8 @@
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"final": "",
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"strategy": "",
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"disable_cache": false,
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"disable_expire": false
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"disable_expire": false,
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"reverse_mapping": false
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}
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}
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@ -43,4 +44,10 @@
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#### disable_expire
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禁用 DNS 缓存过期。
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禁用 DNS 缓存过期。
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#### reverse_mapping
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在响应 DNS 查询后存储 IP 地址的反向映射以为路由目的提供域名。
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由于此过程依赖于应用程序在发出请求之前解析域名的行为,因此在 macOS 等 DNS 由系统代理和缓存的环境中可能会出现问题。
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@ -10,9 +10,10 @@ import (
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)
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type DNSOptions struct {
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Servers []DNSServerOptions `json:"servers,omitempty"`
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Rules []DNSRule `json:"rules,omitempty"`
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Final string `json:"final,omitempty"`
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Servers []DNSServerOptions `json:"servers,omitempty"`
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Rules []DNSRule `json:"rules,omitempty"`
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Final string `json:"final,omitempty"`
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ReverseMapping bool `json:"reverse_mapping,omitempty"`
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DNSClientOptions
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}
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@ -69,6 +69,7 @@ type Router struct {
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transports []dns.Transport
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transportMap map[string]dns.Transport
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transportDomainStrategy map[dns.Transport]dns.DomainStrategy
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dnsReverseMapping *DNSReverseMapping
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interfaceFinder myInterfaceFinder
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autoDetectInterface bool
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defaultInterface string
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@ -237,6 +238,10 @@ func NewRouter(
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router.transportMap = transportMap
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router.transportDomainStrategy = transportDomainStrategy
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if dnsOptions.ReverseMapping {
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router.dnsReverseMapping = NewDNSReverseMapping()
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}
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usePlatformDefaultInterfaceMonitor := platformInterface != nil && platformInterface.UsePlatformDefaultInterfaceMonitor()
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needInterfaceMonitor := options.AutoDetectInterface || common.Any(inbounds, func(inbound option.Inbound) bool {
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return inbound.HTTPOptions.SetSystemProxy || inbound.MixedOptions.SetSystemProxy || inbound.TunOptions.AutoRoute
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@ -631,6 +636,15 @@ func (r *Router) RouteConnection(ctx context.Context, conn net.Conn, metadata ad
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buffer.Release()
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}
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}
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if r.dnsReverseMapping != nil && metadata.Domain == "" {
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domain, loaded := r.dnsReverseMapping.Query(metadata.Destination.Addr)
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if loaded {
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metadata.Domain = domain
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r.logger.DebugContext(ctx, "found reserve mapped domain: ", metadata.Domain)
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}
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}
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if metadata.Destination.IsFqdn() && dns.DomainStrategy(metadata.InboundOptions.DomainStrategy) != dns.DomainStrategyAsIS {
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addresses, err := r.Lookup(adapter.WithContext(ctx, &metadata), metadata.Destination.Fqdn, dns.DomainStrategy(metadata.InboundOptions.DomainStrategy))
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if err != nil {
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@ -4,17 +4,39 @@ import (
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"context"
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"net/netip"
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"strings"
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"time"
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"github.com/sagernet/sing-box/adapter"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-dns"
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"github.com/sagernet/sing/common/cache"
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E "github.com/sagernet/sing/common/exceptions"
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F "github.com/sagernet/sing/common/format"
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M "github.com/sagernet/sing/common/metadata"
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mDNS "github.com/miekg/dns"
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)
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type DNSReverseMapping struct {
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cache *cache.LruCache[netip.Addr, string]
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}
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func NewDNSReverseMapping() *DNSReverseMapping {
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return &DNSReverseMapping{
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cache: cache.New[netip.Addr, string](),
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}
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}
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func (m *DNSReverseMapping) Save(address netip.Addr, domain string, ttl int) {
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m.cache.StoreWithExpire(address, domain, time.Now().Add(time.Duration(ttl)*time.Second))
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}
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func (m *DNSReverseMapping) Query(address netip.Addr) (string, bool) {
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domain, loaded := m.cache.Load(address)
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return domain, loaded
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}
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func (r *Router) matchDNS(ctx context.Context) (context.Context, dns.Transport, dns.DomainStrategy) {
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metadata := adapter.ContextFrom(ctx)
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if metadata == nil {
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@ -69,6 +91,16 @@ func (r *Router) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, er
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if len(message.Question) > 0 && response != nil {
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LogDNSAnswers(r.dnsLogger, ctx, message.Question[0].Name, response.Answer)
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}
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if r.dnsReverseMapping != nil && len(message.Question) > 0 && response != nil && len(response.Answer) > 0 {
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for _, answer := range response.Answer {
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switch record := answer.(type) {
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case *mDNS.A:
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r.dnsReverseMapping.Save(M.AddrFromIP(record.A), fqdnToDomain(record.Hdr.Name), int(record.Hdr.Ttl))
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case *mDNS.AAAA:
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r.dnsReverseMapping.Save(M.AddrFromIP(record.AAAA), fqdnToDomain(record.Hdr.Name), int(record.Hdr.Ttl))
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}
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}
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}
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return response, err
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}
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