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Implement blocking, fully compatible with rules from version 1

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This commit is contained in:
Frank Denis 2018-01-17 02:40:47 +01:00
parent a8ec0957e8
commit 170e2e816e
20 changed files with 3275 additions and 5 deletions
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23
dnscrypt-proxy/plugins.go
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@ -1,9 +1,11 @@
package main
import (
"errors"
"net"
"sync"
"github.com/jedisct1/dlog"
"github.com/miekg/dns"
)
@ -43,6 +45,9 @@ func InitPluginsGlobals(pluginsGlobals *PluginsGlobals, proxy *Proxy) error {
if len(proxy.queryLogFile) != 0 {
*queryPlugins = append(*queryPlugins, Plugin(new(PluginQueryLog)))
}
if len(proxy.blockNameFile) != 0 {
*queryPlugins = append(*queryPlugins, Plugin(new(PluginBlockName)))
}
if proxy.pluginBlockIPv6 {
*queryPlugins = append(*queryPlugins, Plugin(new(PluginBlockIPv6)))
}
@ -103,6 +108,9 @@ func (pluginsState *PluginsState) ApplyQueryPlugins(pluginsGlobals *PluginsGloba
if err := msg.Unpack(packet); err != nil {
return packet, err
}
if len(msg.Question) > 1 {
return packet, errors.New("Unexpected number of questions")
}
pluginsGlobals.RLock()
for _, plugin := range *pluginsGlobals.queryPlugins {
if ret := plugin.Eval(pluginsState, &msg); ret != nil {
@ -110,6 +118,13 @@ func (pluginsState *PluginsState) ApplyQueryPlugins(pluginsGlobals *PluginsGloba
pluginsState.action = PluginsActionDrop
return packet, ret
}
if pluginsState.action == PluginsActionReject {
synth, err := RefusedResponseFromMessage(&msg)
if err != nil {
return nil, err
}
pluginsState.synthResponse = synth
}
if pluginsState.action != PluginsActionForward {
break
}
@ -138,6 +153,14 @@ func (pluginsState *PluginsState) ApplyResponsePlugins(pluginsGlobals *PluginsGl
pluginsState.action = PluginsActionDrop
return packet, ret
}
if pluginsState.action == PluginsActionReject {
synth, err := RefusedResponseFromMessage(&msg)
if err != nil {
return nil, err
}
dlog.Infof("Blocking [%s]", synth.Question[0].Name)
pluginsState.synthResponse = synth
}
if pluginsState.action != PluginsActionForward {
break
}