STRLCPY/sing-box

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docs/configuration/dns/index.md

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10	10		"final": "",
11	11		"strategy": "",
12	12		"disable_cache": false,
13		-	"disable_expire": false
	13	+	"disable_expire": false,
	14	+	"reverse_mapping": false
14	15		}
15	16		}
16	17
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44	45		#### disable_expire
45	46
46	47		Disable dns cache expire.
	48	+
	49	+	#### reverse_mapping
	50	+
	51	+	Stores a reverse mapping of IP addresses after responding to a DNS query in order to provide domain names when routing.
	52	+
	53	+	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.
	54	+

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docs/configuration/dns/index.zh.md

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10	10		"final": "",
11	11		"strategy": "",
12	12		"disable_cache": false,
13		-	"disable_expire": false
	13	+	"disable_expire": false,
	14	+	"reverse_mapping": false
14	15		}
15	16		}
16	17
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44	45		#### disable_expire
45	46
46	47		禁用 DNS 缓存过期。
	48	+
	49	+	#### reverse_mapping
	50	+
	51	+	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。
	52	+
	53	+	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。
	54	+

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option/dns.go

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10	10		)
11	11
12	12		type DNSOptions struct {
13		-	Servers []DNSServerOptions `json:"servers,omitempty"`
14		-	Rules []DNSRule `json:"rules,omitempty"`
15		-	Final string `json:"final,omitempty"`
	13	+	Servers []DNSServerOptions `json:"servers,omitempty"`
	14	+	Rules []DNSRule `json:"rules,omitempty"`
	15	+	Final string `json:"final,omitempty"`
	16	+	ReverseMapping bool `json:"reverse_mapping,omitempty"`
16	17		DNSClientOptions
17	18		}
18	19
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route/router.go

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89	89		transports []dns.Transport
90	90		transportMap map[string]dns.Transport
91	91		transportDomainStrategy map[dns.Transport]dns.DomainStrategy
	92	+	dnsReverseMapping *DNSReverseMapping
92	93		interfaceFinder myInterfaceFinder
93	94		autoDetectInterface bool
94	95		defaultInterface string
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266	267		router.transports = transports
267	268		router.transportMap = transportMap
268	269		router.transportDomainStrategy = transportDomainStrategy
	270	+
	271	+	if dnsOptions.ReverseMapping {
	272	+	router.dnsReverseMapping = NewDNSReverseMapping()
	273	+	}
269	274
270	275		needInterfaceMonitor := platformInterface == nil && (options.AutoDetectInterface \|\| common.Any(inbounds, func(inbound option.Inbound) bool {
271	276		return inbound.HTTPOptions.SetSystemProxy \|\| inbound.MixedOptions.SetSystemProxy \|\| inbound.TunOptions.AutoRoute
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627	632		buffer.Release()
628	633		}
629	634		}
	635	+
	636	+	if r.dnsReverseMapping != nil && metadata.Domain == "" {
	637	+	domain, loaded := r.dnsReverseMapping.Query(metadata.Destination.Addr)
	638	+	if loaded {
	639	+	metadata.Domain = domain
	640	+	r.logger.DebugContext(ctx, "found reserve mapped domain: ", metadata.Domain)
	641	+	}
	642	+	}
	643	+
630	644		if metadata.Destination.IsFqdn() && dns.DomainStrategy(metadata.InboundOptions.DomainStrategy) != dns.DomainStrategyAsIS {
631	645		addresses, err := r.Lookup(adapter.WithContext(ctx, &metadata), metadata.Destination.Fqdn, dns.DomainStrategy(metadata.InboundOptions.DomainStrategy))
632	646		if err != nil {
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route/router_dns.go

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4	4		"context"
5	5		"net/netip"
6	6		"strings"
	7	+	"time"
7	8
8	9		"github.com/sagernet/sing-box/adapter"
9	10		C "github.com/sagernet/sing-box/constant"
10	11		"github.com/sagernet/sing-box/log"
11	12		"github.com/sagernet/sing-dns"
	13	+	"github.com/sagernet/sing/common/cache"
12	14		E "github.com/sagernet/sing/common/exceptions"
13	15		F "github.com/sagernet/sing/common/format"
	16	+	M "github.com/sagernet/sing/common/metadata"
14	17
15	18		mDNS "github.com/miekg/dns"
16	19		)
	20	+
	21	+	type DNSReverseMapping struct {
	22	+	cache *cache.LruCache[netip.Addr, string]
	23	+	}
	24	+
	25	+	func NewDNSReverseMapping() *DNSReverseMapping {
	26	+	return &DNSReverseMapping{
	27	+	cache: cache.New[netip.Addr, string](),
	28	+	}
	29	+	}
	30	+
	31	+	func (m *DNSReverseMapping) Save(address netip.Addr, domain string, ttl int) {
	32	+	m.cache.StoreWithExpire(address, domain, time.Now().Add(time.Duration(ttl)*time.Second))
	33	+	}
	34	+
	35	+	func (m *DNSReverseMapping) Query(address netip.Addr) (string, bool) {
	36	+	domain, loaded := m.cache.Load(address)
	37	+	return domain, loaded
	38	+	}
17	39
18	40		func (r *Router) matchDNS(ctx context.Context) (context.Context, dns.Transport, dns.DomainStrategy) {
19	41		metadata := adapter.ContextFrom(ctx)
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68	90		}
69	91		if len(message.Question) > 0 && response != nil {
70	92		LogDNSAnswers(r.dnsLogger, ctx, message.Question[0].Name, response.Answer)
	93	+	}
	94	+	if r.dnsReverseMapping != nil && len(message.Question) > 0 && response != nil && len(response.Answer) > 0 {
	95	+	for _, answer := range response.Answer {
	96	+	switch record := answer.(type) {
	97	+	case *mDNS.A:
	98	+	r.dnsReverseMapping.Save(M.AddrFromIP(record.A), fqdnToDomain(record.Hdr.Name), int(record.Hdr.Ttl))
	99	+	case *mDNS.AAAA:
	100	+	r.dnsReverseMapping.Save(M.AddrFromIP(record.AAAA), fqdnToDomain(record.Hdr.Name), int(record.Hdr.Ttl))
	101	+	}
	102	+	}
71	103		}
72	104		return response, err
73	105		}
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Add dns reverse mapping