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Fix: dns cache behavior

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This commit is contained in:
Dreamacro 2019-02-23 20:31:59 +08:00
parent 04927229ff
commit ca5399a16e
2 changed files with 32 additions and 19 deletions
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23
dns/client.go
View file

@ -12,7 +12,6 @@ import (
"github.com/Dreamacro/clash/common/cache"
"github.com/Dreamacro/clash/common/picker"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/log"
D "github.com/miekg/dns"
geoip2 "github.com/oschwald/geoip2-golang"
@ -55,23 +54,17 @@ func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
cache, expireTime := r.cache.GetWithExpire(q.String())
if cache != nil {
msg = cache.(*D.Msg).Copy()
if len(msg.Answer) > 0 {
ttl := uint32(expireTime.Sub(time.Now()).Seconds())
for _, answer := range msg.Answer {
answer.Header().Ttl = ttl
}
}
setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
return
}
defer func() {
if msg != nil {
putMsgToCache(r.cache, q.String(), msg)
if r.mapping {
ips, err := r.msgToIP(msg)
if err != nil {
log.Debugln("[DNS] msg to ip error: %s", err.Error())
return
}
if msg == nil {
return
}
putMsgToCache(r.cache, q.String(), msg)
if r.mapping {
if ips, err := r.msgToIP(msg); err == nil {
for _, ip := range ips {
putMsgToCache(r.cache, ip.String(), msg)
}

28
dns/util.go
View file

@ -79,11 +79,31 @@ func (e EnhancedMode) String() string {
}
func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
if len(msg.Answer) == 0 {
log.Debugln("[DNS] answer length is zero: %#v", msg)
var ttl time.Duration
if len(msg.Answer) != 0 {
ttl = time.Duration(msg.Answer[0].Header().Ttl) * time.Second
} else if len(msg.Ns) != 0 {
ttl = time.Duration(msg.Ns[0].Header().Ttl) * time.Second
} else if len(msg.Extra) != 0 {
ttl = time.Duration(msg.Extra[0].Header().Ttl) * time.Second
} else {
log.Debugln("[DNS] response msg error: %#v", msg)
return
}
ttl := time.Duration(msg.Answer[0].Header().Ttl) * time.Second
c.Put(key, msg, ttl)
c.Put(key, msg.Copy(), ttl)
}
func setMsgTTL(msg *D.Msg, ttl uint32) {
for _, answer := range msg.Answer {
answer.Header().Ttl = ttl
}
for _, ns := range msg.Ns {
ns.Header().Ttl = ttl
}
for _, extra := range msg.Extra {
extra.Header().Ttl = ttl
}
}