miracle091/dnscrypt-proxy
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dnscrypt-proxy
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Code Issues Releases Wiki Activity

Don't delete cached server IP addresses 

If we can't update an entry, keep the previous one.
This commit is contained in:
Frank Denis 2019-11-01 22:55:06 +01:00
parent 3db3de0a91
commit e028f4d483
1 changed files with 17 additions and 12 deletions
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29
dnscrypt-proxy/xtransport.go
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@ -97,21 +97,21 @@ func (xTransport *XTransport) saveCachedIP(host string, ip net.IP, ttl time.Dura
xTransport.cachedIPs.Unlock()
}
func (xTransport *XTransport) loadCachedIP(host string, deleteIfExpired bool) (net.IP, bool) {
func (xTransport *XTransport) loadCachedIP(host string) (ip net.IP, expired bool) {
ip = nil
expired = false
xTransport.cachedIPs.RLock()
item, ok := xTransport.cachedIPs.cache[host]
xTransport.cachedIPs.RUnlock()
if !ok {
return nil, false
return
}
ip = item.ip
expiration := item.expiration
if deleteIfExpired && expiration != nil && time.Until(*expiration) < 0 {
xTransport.cachedIPs.Lock()
delete(xTransport.cachedIPs.cache, host)
xTransport.cachedIPs.Unlock()
return nil, false
if expiration != nil && time.Until(*expiration) < 0 {
expired = true
}
return item.ip, ok
return
}
func (xTransport *XTransport) rebuildTransport() {
@ -131,8 +131,8 @@ func (xTransport *XTransport) rebuildTransport() {
DialContext: func(ctx context.Context, network, addrStr string) (net.Conn, error) {
host, port := ExtractHostAndPort(addrStr, stamps.DefaultPort)
ipOnly := host
cachedIP, ok := xTransport.loadCachedIP(host, false)
if ok {
cachedIP, _ := xTransport.loadCachedIP(host)
if cachedIP == nil {
if ipv4 := cachedIP.To4(); ipv4 != nil {
ipOnly = ipv4.String()
} else {
@ -249,7 +249,8 @@ func (xTransport *XTransport) resolveHost(host string) (err error) {
if ParseIP(host) != nil {
return
}
if _, ok := xTransport.loadCachedIP(host, true); ok {
cachedIP, expired := xTransport.loadCachedIP(host)
if !expired {
return
}
var foundIP net.IP
@ -275,7 +276,11 @@ func (xTransport *XTransport) resolveHost(host string) (err error) {
}
}
if err != nil {
return
if cachedIP != nil {
foundIP = cachedIP
} else {
return
}
}
xTransport.saveCachedIP(host, foundIP, ttl)
dlog.Debugf("[%s] IP address [%s] added to the cache, valid until %v", host, foundIP, ttl)