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chore: Something update from clash :) (#606)

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タイムライン
2023-06-06 09:45:05 +08:00
committed by GitHub
parent e7174866e5
commit dafecebdc0
11 changed files with 100 additions and 31 deletions
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3
dns/resolver.go
View File

@ -165,7 +165,8 @@ func (r *Resolver) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, e
setMsgTTL(msg, uint32(1)) // Continue fetch
continueFetch = true
} else {
setMsgTTL(msg, uint32(time.Until(expireTime).Seconds()))
// updating TTL by subtracting common delta time from each DNS record
updateMsgTTL(msg, uint32(time.Until(expireTime).Seconds()))
}
return
}

29
dns/util.go
View File

@ -21,12 +21,29 @@ import (
"github.com/Dreamacro/clash/tunnel"
D "github.com/miekg/dns"
"github.com/samber/lo"
)
const (
MaxMsgSize = 65535
)
func minimalTTL(records []D.RR) uint32 {
return lo.MinBy(records, func(r1 D.RR, r2 D.RR) bool {
return r1.Header().Ttl < r2.Header().Ttl
}).Header().Ttl
}
func updateTTL(records []D.RR, ttl uint32) {
if len(records) == 0 {
return
}
delta := minimalTTL(records) - ttl
for i := range records {
records[i].Header().Ttl = lo.Clamp(records[i].Header().Ttl-delta, 1, records[i].Header().Ttl)
}
}
func putMsgToCache(c *cache.LruCache[string, *D.Msg], key string, msg *D.Msg) {
// skip dns cache for acme challenge
if len(msg.Question) != 0 {
@ -38,11 +55,11 @@ func putMsgToCache(c *cache.LruCache[string, *D.Msg], key string, msg *D.Msg) {
var ttl uint32
switch {
case len(msg.Answer) != 0:
ttl = msg.Answer[0].Header().Ttl
ttl = minimalTTL(msg.Answer)
case len(msg.Ns) != 0:
ttl = msg.Ns[0].Header().Ttl
ttl = minimalTTL(msg.Ns)
case len(msg.Extra) != 0:
ttl = msg.Extra[0].Header().Ttl
ttl = minimalTTL(msg.Extra)
default:
log.Debugln("[DNS] response msg empty: %#v", msg)
return
@ -65,6 +82,12 @@ func setMsgTTL(msg *D.Msg, ttl uint32) {
}
}
func updateMsgTTL(msg *D.Msg, ttl uint32) {
updateTTL(msg.Answer, ttl)
updateTTL(msg.Ns, ttl)
updateTTL(msg.Extra, ttl)
}
func isIPRequest(q D.Question) bool {
return q.Qclass == D.ClassINET && (q.Qtype == D.TypeA || q.Qtype == D.TypeAAAA || q.Qtype == D.TypeCNAME)
}