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Strip EDNS0 options in responses

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This commit is contained in:
Frank Denis 2019-12-22 18:02:33 +01:00
parent 5118ed21fd
commit adb6dac420
3 changed files with 12 additions and 5 deletions
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11
dnscrypt-proxy/dnsutils.go
View file

@ -209,7 +209,7 @@ func updateTTL(msg *dns.Msg, expiration time.Time) {
}
}
func addPaddingIfNoneFound(packet *[]byte, paddingLen int) *[]byte {
func addEDNS0PaddingIfNoneFound(packet *[]byte, paddingLen int) *[]byte {
msg := dns.Msg{Compress: true}
if msg.Unpack(*packet) != nil {
return packet
@ -237,3 +237,12 @@ func addPaddingIfNoneFound(packet *[]byte, paddingLen int) *[]byte {
}
return &paddedPacket
}
func removeEDNS0Options(msg *dns.Msg) bool {
edns0 := msg.IsEdns0()
if edns0 == nil {
return false
}
edns0.Option = []dns.EDNS0{}
return true
}

4
dnscrypt-proxy/plugins.go
View file

@ -284,9 +284,6 @@ func (pluginsState *PluginsState) ApplyQueryPlugins(pluginsGlobals *PluginsGloba
}
func (pluginsState *PluginsState) ApplyResponsePlugins(pluginsGlobals *PluginsGlobals, packet []byte, ttl *uint32) ([]byte, error) {
if len(*pluginsGlobals.responsePlugins) == 0 && len(*pluginsGlobals.loggingPlugins) == 0 {
return packet, nil
}
msg := dns.Msg{Compress: true}
if err := msg.Unpack(packet); err != nil {
if len(packet) >= MinDNSPacketSize && HasTCFlag(packet) {
@ -304,6 +301,7 @@ func (pluginsState *PluginsState) ApplyResponsePlugins(pluginsGlobals *PluginsGl
default:
pluginsState.returnCode = PluginsReturnCodeResponseError
}
removeEDNS0Options(&msg)
pluginsGlobals.RLock()
defer pluginsGlobals.RUnlock()
for _, plugin := range *pluginsGlobals.responsePlugins {

2
dnscrypt-proxy/xtransport.go
View file

@ -373,7 +373,7 @@ func (xTransport *XTransport) Post(url *url.URL, accept string, contentType stri
func (xTransport *XTransport) DoHQuery(useGet bool, url *url.URL, body []byte, timeout time.Duration) (*http.Response, time.Duration, error) {
padLen := 63 - (len(body)+63)&63
dataType := "application/dns-message"
paddedBody := addPaddingIfNoneFound(&body, padLen)
paddedBody := addEDNS0PaddingIfNoneFound(&body, padLen)
if useGet {
qs := url.Query()
qs.Add("ct", "")