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Add Init/Drop/Update methods to plugins

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Eventually, we may want to provide a specific structure for plugin
initialization. Sending the whole Proxy structure doesn't scale well.
This commit is contained in:
Frank Denis 2018-01-15 23:07:41 +01:00
parent b945e23101
commit 3ffad7be44
2 changed files with 137 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

156
dnscrypt-proxy/plugins.go
View file

@ -22,6 +22,14 @@ const (
PluginsActionSynth = 4
)
type PluginsGlobals struct {
sync.RWMutex
queryPlugins *[]Plugin
responsePlugins *[]Plugin
}
var pluginsGlobals PluginsGlobals
type PluginsState struct {
sessionData map[string]interface{}
action PluginsAction
@ -29,8 +37,6 @@ type PluginsState struct {
maxPayloadSize int
clientProto string
clientAddr *net.Addr
queryPlugins *[]Plugin
responsePlugins *[]Plugin
synthResponse *dns.Msg
dnssec bool
cacheSize int
@ -39,13 +45,7 @@ type PluginsState struct {
cacheMaxTTL uint32
}
type Plugin interface {
Name() string
Description() string
Eval(pluginsState *PluginsState, msg *dns.Msg) error
}
func NewPluginsState(proxy *Proxy, clientProto string, clientAddr *net.Addr) PluginsState {
func InitPluginsGlobals(pluginsGlobals *PluginsGlobals, proxy *Proxy) error {
queryPlugins := &[]Plugin{}
if proxy.pluginBlockIPv6 {
*queryPlugins = append(*queryPlugins, Plugin(new(PluginBlockIPv6)))
@ -60,24 +60,48 @@ func NewPluginsState(proxy *Proxy, clientProto string, clientAddr *net.Addr) Plu
*responsePlugins = append(*responsePlugins, Plugin(new(PluginCacheResponse)))
}
for _, plugin := range *queryPlugins {
if err := plugin.Init(proxy); err != nil {
return err
}
}
for _, plugin := range *responsePlugins {
if err := plugin.Init(proxy); err != nil {
return err
}
}
(*pluginsGlobals).queryPlugins = queryPlugins
(*pluginsGlobals).responsePlugins = responsePlugins
return nil
}
type Plugin interface {
Name() string
Description() string
Init(proxy *Proxy) error
Drop() error
Reload() error
Eval(pluginsState *PluginsState, msg *dns.Msg) error
}
func NewPluginsState(proxy *Proxy, clientProto string, clientAddr *net.Addr) PluginsState {
return PluginsState{
action: PluginsActionForward,
maxPayloadSize: MaxDNSUDPPacketSize - ResponseOverhead,
queryPlugins: queryPlugins,
responsePlugins: responsePlugins,
clientProto: clientProto,
clientAddr: clientAddr,
cacheSize: proxy.cacheSize,
cacheNegTTL: proxy.cacheNegTTL,
cacheMinTTL: proxy.cacheMinTTL,
cacheMaxTTL: proxy.cacheMaxTTL,
action: PluginsActionForward,
maxPayloadSize: MaxDNSUDPPacketSize - ResponseOverhead,
clientProto: clientProto,
clientAddr: clientAddr,
cacheSize: proxy.cacheSize,
cacheNegTTL: proxy.cacheNegTTL,
cacheMinTTL: proxy.cacheMinTTL,
cacheMaxTTL: proxy.cacheMaxTTL,
}
}
// ---------------- Query plugins ----------------
func (pluginsState *PluginsState) ApplyQueryPlugins(packet []byte) ([]byte, error) {
if len(*pluginsState.queryPlugins) == 0 {
func (pluginsState *PluginsState) ApplyQueryPlugins(pluginsGlobals *PluginsGlobals, packet []byte) ([]byte, error) {
if len(*pluginsGlobals.queryPlugins) == 0 {
return packet, nil
}
pluginsState.action = PluginsActionForward
@ -85,8 +109,10 @@ func (pluginsState *PluginsState) ApplyQueryPlugins(packet []byte) ([]byte, erro
if err := msg.Unpack(packet); err != nil {
return packet, err
}
for _, plugin := range *pluginsState.queryPlugins {
pluginsGlobals.RLock()
for _, plugin := range *pluginsGlobals.queryPlugins {
if ret := plugin.Eval(pluginsState, &msg); ret != nil {
pluginsGlobals.RUnlock()
pluginsState.action = PluginsActionDrop
return packet, ret
}
@ -94,6 +120,7 @@ func (pluginsState *PluginsState) ApplyQueryPlugins(packet []byte) ([]byte, erro
break
}
}
pluginsGlobals.RUnlock()
packet2, err := msg.PackBuffer(packet)
if err != nil {
return packet, err
@ -113,6 +140,18 @@ func (plugin *PluginGetSetPayloadSize) Description() string {
return "Adjusts the maximum payload size advertised in queries sent to upstream servers."
}
func (plugin *PluginGetSetPayloadSize) Init(proxy *Proxy) error {
return nil
}
func (plugin *PluginGetSetPayloadSize) Drop() error {
return nil
}
func (plugin *PluginGetSetPayloadSize) Reload() error {
return nil
}
func (plugin *PluginGetSetPayloadSize) Eval(pluginsState *PluginsState, msg *dns.Msg) error {
pluginsState.originalMaxPayloadSize = 512 - ResponseOverhead
opt := msg.IsEdns0()
@ -148,6 +187,18 @@ func (plugin *PluginBlockIPv6) Description() string {
return "Immediately return a synthetic response to AAAA queries"
}
func (plugin *PluginBlockIPv6) Init(proxy *Proxy) error {
return nil
}
func (plugin *PluginBlockIPv6) Drop() error {
return nil
}
func (plugin *PluginBlockIPv6) Reload() error {
return nil
}
func (plugin *PluginBlockIPv6) Eval(pluginsState *PluginsState, msg *dns.Msg) error {
questions := msg.Question
if len(questions) != 1 {
@ -166,10 +217,38 @@ func (plugin *PluginBlockIPv6) Eval(pluginsState *PluginsState, msg *dns.Msg) er
return nil
}
// -------- querylog plugin --------
type PluginQueryLog struct{}
func (plugin *PluginQueryLog) Name() string {
return "querylog"
}
func (plugin *PluginQueryLog) Description() string {
return "Log DNS queries"
}
func (plugin *PluginQueryLog) Init(proxy *Proxy) error {
return nil
}
func (plugin *PluginQueryLog) Drop() error {
return nil
}
func (plugin *PluginQueryLog) Reload() error {
return nil
}
func (plugin *PluginQueryLog) Eval(pluginsState *PluginsState, msg *dns.Msg) error {
return nil
}
// ---------------- Response plugins ----------------
func (pluginsState *PluginsState) ApplyResponsePlugins(packet []byte) ([]byte, error) {
if len(*pluginsState.responsePlugins) == 0 {
func (pluginsState *PluginsState) ApplyResponsePlugins(pluginsGlobals *PluginsGlobals, packet []byte) ([]byte, error) {
if len(*pluginsGlobals.responsePlugins) == 0 {
return packet, nil
}
pluginsState.action = PluginsActionForward
@ -177,8 +256,10 @@ func (pluginsState *PluginsState) ApplyResponsePlugins(packet []byte) ([]byte, e
if err := msg.Unpack(packet); err != nil {
return packet, err
}
for _, plugin := range *pluginsState.responsePlugins {
pluginsGlobals.RLock()
for _, plugin := range *pluginsGlobals.responsePlugins {
if ret := plugin.Eval(pluginsState, &msg); ret != nil {
pluginsGlobals.RUnlock()
pluginsState.action = PluginsActionDrop
return packet, ret
}
@ -186,6 +267,7 @@ func (pluginsState *PluginsState) ApplyResponsePlugins(packet []byte) ([]byte, e
break
}
}
pluginsGlobals.RUnlock()
packet2, err := msg.PackBuffer(packet)
if err != nil {
return packet, err
@ -219,6 +301,18 @@ func (plugin *PluginCacheResponse) Description() string {
return "DNS cache (writer)."
}
func (plugin *PluginCacheResponse) Init(proxy *Proxy) error {
return nil
}
func (plugin *PluginCacheResponse) Drop() error {
return nil
}
func (plugin *PluginCacheResponse) Reload() error {
return nil
}
func (plugin *PluginCacheResponse) Eval(pluginsState *PluginsState, msg *dns.Msg) error {
plugin.cachedResponses = &cachedResponses
if msg.Rcode == dns.RcodeServerFailure {
@ -257,6 +351,18 @@ func (plugin *PluginCache) Description() string {
return "DNS cache (reader)."
}
func (plugin *PluginCache) Init(proxy *Proxy) error {
return nil
}
func (plugin *PluginCache) Drop() error {
return nil
}
func (plugin *PluginCache) Reload() error {
return nil
}
func (plugin *PluginCache) Eval(pluginsState *PluginsState, msg *dns.Msg) error {
plugin.cachedResponses = &cachedResponses