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Improve DNS caching

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世界 2023-04-26 04:53:25 +08:00
parent 2a76b8fbeb
commit 7050011802
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GPG Key ID: CD109927C34A63C4
7 changed files with 47 additions and 23 deletions
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5
docs/configuration/dns/index.md
View File

@ -11,6 +11,7 @@
"strategy": "",
"disable_cache": false,
"disable_expire": false,
"independent_cache": false,
"reverse_mapping": false,
"fakeip": {}
}
@ -48,6 +49,10 @@ Disable dns cache.
Disable dns cache expire.
#### independent_cache
Make each DNS server's cache independent for special purposes. If enabled, will slightly degrade performance.
#### reverse_mapping
Stores a reverse mapping of IP addresses after responding to a DNS query in order to provide domain names when routing.

5
docs/configuration/dns/index.zh.md
View File

@ -11,6 +11,7 @@
"strategy": "",
"disable_cache": false,
"disable_expire": false,
"independent_cache": false,
"reverse_mapping": false,
"fakeip": {}
}
@ -47,6 +48,10 @@
禁用 DNS 缓存过期。
#### independent_cache
使每个 DNS 服务器的缓存独立，以满足特殊目的。如果启用，将轻微降低性能。
#### reverse_mapping
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。

2
go.mod
View File

@ -25,7 +25,7 @@ require (
github.com/sagernet/quic-go v0.0.0-20230202071646-a8c8afb18b32
github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691
github.com/sagernet/sing v0.2.5-0.20230425122720-bf0aaacc6754
github.com/sagernet/sing-dns v0.1.5-0.20230415085626-111ecf799dfc
github.com/sagernet/sing-dns v0.1.5-0.20230426113254-25d948c44223
github.com/sagernet/sing-mux v0.0.0-20230425130511-b0a6ffd8406f
github.com/sagernet/sing-shadowsocks v0.2.2-0.20230417102954-f77257340507
github.com/sagernet/sing-shadowtls v0.1.2-0.20230417103049-4f682e05f19b

4
go.sum
View File

@ -113,8 +113,8 @@ github.com/sagernet/sing v0.0.0-20220817130738-ce854cda8522/go.mod h1:QVsS5L/ZA2
github.com/sagernet/sing v0.1.8/go.mod h1:jt1w2u7lJQFFSGLiRrRIs5YWmx4kAPfWuOejuDW9qMk=
github.com/sagernet/sing v0.2.5-0.20230425122720-bf0aaacc6754 h1:y89Ntm1rrZPQVb1f+TKd4DH6NwX5XCyMIwoseTQd/5U=
github.com/sagernet/sing v0.2.5-0.20230425122720-bf0aaacc6754/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
github.com/sagernet/sing-dns v0.1.5-0.20230415085626-111ecf799dfc h1:hmbuqKv48SAjiKPoqtJGvS5pEHVPZjTHq9CPwQY2cZ4=
github.com/sagernet/sing-dns v0.1.5-0.20230415085626-111ecf799dfc/go.mod h1:ZKuuqgsHRxDahYrzgSgy4vIAGGuKPlIf4hLcNzYzLkY=
github.com/sagernet/sing-dns v0.1.5-0.20230426113254-25d948c44223 h1:L4eMuM07iSHY3UCknFnuFuHoe5clZuF2Xnf2wwA6Lwc=
github.com/sagernet/sing-dns v0.1.5-0.20230426113254-25d948c44223/go.mod h1:ZKuuqgsHRxDahYrzgSgy4vIAGGuKPlIf4hLcNzYzLkY=
github.com/sagernet/sing-mux v0.0.0-20230425130511-b0a6ffd8406f h1:iEpOTgBTjt0vZJVXMTqYq13XyIu/337TWbq6WZ3CMWc=
github.com/sagernet/sing-mux v0.0.0-20230425130511-b0a6ffd8406f/go.mod h1:pF+RnLvCAOhECrvauy6LYOpBakJ/vuaF1Wm4lPsWryI=
github.com/sagernet/sing-shadowsocks v0.2.2-0.20230417102954-f77257340507 h1:bAHZCdWqJkb8LEW98+YsMVDXGRMUVjka8IC+St6ot88=

7
option/dns.go
View File

@ -20,9 +20,10 @@ type DNSServerOptions struct {
}
type DNSClientOptions struct {
Strategy DomainStrategy `json:"strategy,omitempty"`
DisableCache bool `json:"disable_cache,omitempty"`
DisableExpire bool `json:"disable_expire,omitempty"`
Strategy DomainStrategy `json:"strategy,omitempty"`
DisableCache bool `json:"disable_cache,omitempty"`
DisableExpire bool `json:"disable_expire,omitempty"`
IndependentCache bool `json:"independent_cache,omitempty"`
}
type DNSFakeIPOptions struct {

7
route/router.go
View File

@ -113,7 +113,12 @@ func NewRouter(
defaultMark: options.DefaultMark,
platformInterface: platformInterface,
}
router.dnsClient = dns.NewClient(dnsOptions.DNSClientOptions.DisableCache, dnsOptions.DNSClientOptions.DisableExpire, router.dnsLogger)
router.dnsClient = dns.NewClient(dns.ClientOptions{
DisableCache: dnsOptions.DNSClientOptions.DisableCache,
DisableExpire: dnsOptions.DNSClientOptions.DisableExpire,
IndependentCache: dnsOptions.DNSClientOptions.IndependentCache,
Logger: router.dnsLogger,
})
for i, ruleOptions := range options.Rules {
routeRule, err := NewRule(router, router.logger, ruleOptions)
if err != nil {

40
route/router_dns.go
View File

@ -73,23 +73,31 @@ func (r *Router) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, er
if len(message.Question) > 0 {
r.dnsLogger.DebugContext(ctx, "exchange ", formatQuestion(message.Question[0].String()))
}
ctx, metadata := adapter.AppendContext(ctx)
if len(message.Question) > 0 {
metadata.QueryType = message.Question[0].Qtype
switch metadata.QueryType {
case mDNS.TypeA:
metadata.IPVersion = 4
case mDNS.TypeAAAA:
metadata.IPVersion = 6
var (
response *mDNS.Msg
cached bool
err error
)
response, cached = r.dnsClient.ExchangeCache(ctx, message)
if !cached {
ctx, metadata := adapter.AppendContext(ctx)
if len(message.Question) > 0 {
metadata.QueryType = message.Question[0].Qtype
switch metadata.QueryType {
case mDNS.TypeA:
metadata.IPVersion = 4
case mDNS.TypeAAAA:
metadata.IPVersion = 6
}
metadata.Domain = fqdnToDomain(message.Question[0].Name)
}
ctx, transport, strategy := r.matchDNS(ctx)
ctx, cancel := context.WithTimeout(ctx, C.DNSTimeout)
defer cancel()
response, err = r.dnsClient.Exchange(ctx, transport, message, strategy)
if err != nil && len(message.Question) > 0 {
r.dnsLogger.ErrorContext(ctx, E.Cause(err, "exchange failed for ", formatQuestion(message.Question[0].String())))
}
metadata.Domain = fqdnToDomain(message.Question[0].Name)
}
ctx, transport, strategy := r.matchDNS(ctx)
ctx, cancel := context.WithTimeout(ctx, C.DNSTimeout)
defer cancel()
response, err := r.dnsClient.Exchange(ctx, transport, message, strategy)
if err != nil && len(message.Question) > 0 {
r.dnsLogger.ErrorContext(ctx, E.Cause(err, "exchange failed for ", formatQuestion(message.Question[0].String())))
}
if len(message.Question) > 0 && response != nil {
LogDNSAnswers(r.dnsLogger, ctx, message.Question[0].Name, response.Answer)