1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "EventReporter.h"
18
19 using android::interface_cast;
20 using android::net::INetdUnsolicitedEventListener;
21 using android::net::metrics::INetdEventListener;
22
getNetdEventListener()23 android::sp<INetdEventListener> EventReporter::getNetdEventListener() {
24 std::lock_guard lock(mEventMutex);
25 if (mNetdEventListener == nullptr) {
26 // Use checkService instead of getService because getService waits for 5 seconds for the
27 // service to become available. The DNS resolver inside netd is started much earlier in the
28 // boot sequence than the framework DNS listener, and we don't want to delay all DNS lookups
29 // for 5 seconds until the DNS listener starts up.
30 android::sp<android::IBinder> b = android::defaultServiceManager()->checkService(
31 android::String16("netd_listener"));
32 mNetdEventListener = interface_cast<INetdEventListener>(b);
33 }
34 // If the netd listener service is dead, the binder call will just return an error, which should
35 // be fine because the only impact is that we can't log netd events. In any case, this should
36 // only happen if the system server is going down, which means it will shortly be taking us down
37 // with it.
38 return mNetdEventListener;
39 }
40
getNetdUnsolicitedEventListenerMap() const41 EventReporter::UnsolListenerMap EventReporter::getNetdUnsolicitedEventListenerMap() const {
42 std::lock_guard lock(mUnsolicitedMutex);
43 return mUnsolListenerMap;
44 }
45
registerUnsolEventListener(const android::sp<INetdUnsolicitedEventListener> & listener)46 void EventReporter::registerUnsolEventListener(
47 const android::sp<INetdUnsolicitedEventListener>& listener) {
48 std::lock_guard lock(mUnsolicitedMutex);
49
50 // Create the death listener.
51 class DeathRecipient : public android::IBinder::DeathRecipient {
52 public:
53 DeathRecipient(EventReporter* eventReporter,
54 android::sp<INetdUnsolicitedEventListener> listener)
55 : mEventReporter(eventReporter), mListener(std::move(listener)) {}
56 ~DeathRecipient() override = default;
57 void binderDied(const android::wp<android::IBinder>& /* who */) override {
58 mEventReporter->unregisterUnsolEventListener(mListener);
59 }
60
61 private:
62 EventReporter* mEventReporter;
63 android::sp<INetdUnsolicitedEventListener> mListener;
64 };
65 android::sp<android::IBinder::DeathRecipient> deathRecipient =
66 new DeathRecipient(this, listener);
67
68 android::IInterface::asBinder(listener)->linkToDeath(deathRecipient);
69
70 // TODO: Consider to use remote binder address as registering key
71 mUnsolListenerMap.insert({listener, deathRecipient});
72 }
73
unregisterUnsolEventListener(const android::sp<INetdUnsolicitedEventListener> & listener)74 void EventReporter::unregisterUnsolEventListener(
75 const android::sp<INetdUnsolicitedEventListener>& listener) {
76 std::lock_guard lock(mUnsolicitedMutex);
77 mUnsolListenerMap.erase(listener);
78 }
79