1 /**
2 * Copyright (c) 2022, 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 #define LOG_TAG "MDnsService"
18
19 #include "MDnsService.h"
20
21 #include <android-base/properties.h>
22 #include <binder/Status.h>
23 #include <binder_utils/BinderUtil.h>
24
25 using android::net::mdns::aidl::DiscoveryInfo;
26 using android::net::mdns::aidl::GetAddressInfo;
27 using android::net::mdns::aidl::IMDnsEventListener;
28 using android::net::mdns::aidl::RegistrationInfo;
29 using android::net::mdns::aidl::ResolutionInfo;
30
31 using std::literals::chrono_literals::operator""s;
32
33 namespace android::net {
34
35 #define MDNS_SERVICE_NAME "mdnsd"
36 #define MDNS_SERVICE_STATUS "init.svc.mdnsd"
37
38 // TODO: DnsResolver has same macro definition but returns ScopedAStatus. Move these macros to
39 // BinderUtil.h to do the same permission check.
40 #define ENFORCE_ANY_PERMISSION(...) \
41 do { \
42 binder::Status status = checkAnyPermission({__VA_ARGS__}); \
43 if (!status.isOk()) { \
44 return status; \
45 } \
46 } while (0)
47
48 #define ENFORCE_NETWORK_STACK_PERMISSIONS() \
49 ENFORCE_ANY_PERMISSION(PERM_NETWORK_STACK, PERM_MAINLINE_NETWORK_STACK)
50
start()51 status_t MDnsService::start() {
52 IPCThreadState::self()->disableBackgroundScheduling(true);
53 const status_t ret = BinderService<MDnsService>::publish();
54 if (ret != android::OK) {
55 return ret;
56 }
57 return android::OK;
58 }
59
startDaemon()60 binder::Status MDnsService::startDaemon() {
61 ENFORCE_NETWORK_STACK_PERMISSIONS();
62 if (android::base::GetProperty(MDNS_SERVICE_STATUS, "") == "running") {
63 return android::binder::Status::fromServiceSpecificError(EBUSY, strerror(EBUSY));
64 }
65
66 ALOGD("Starting MDNSD");
67 android::base::SetProperty("ctl.start", MDNS_SERVICE_NAME);
68 // To maintain the same behavior as before, the returned value is not checked.
69 android::base::WaitForProperty(MDNS_SERVICE_STATUS, "running", 5s);
70 return binder::Status::ok();
71 }
72
stopDaemon()73 binder::Status MDnsService::stopDaemon() {
74 ENFORCE_NETWORK_STACK_PERMISSIONS();
75 ALOGD("Stopping MDNSD");
76 android::base::SetProperty("ctl.stop", MDNS_SERVICE_NAME);
77 android::base::WaitForProperty(MDNS_SERVICE_STATUS, "stopped", 5s);
78 return binder::Status::ok();
79 }
80
registerService(const RegistrationInfo &)81 binder::Status MDnsService::registerService(const RegistrationInfo&) {
82 // TODO(b/298594687): switch from EX_SERVICE_SPECIFIC to DEPRECATED when tethering module
83 // for 2024-02 release is fully rolled out and prebuilt updated in AP1A.xxxxxx.yy build.
84 // Return EX_SERVICE_SPECIFIC for short-term only because callers in tethering module do not
85 // catch the EX_UNSUPPORTED_OPERATION. It will throw an exception and cause a fatal exception.
86 // The EX_UNSUPPORTED_OPERATION has been catched in tethering module since 2024-02 release.
87 // TODO(b/298594687): switch to DEPRECATED.
88 return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
89 // DEPRECATED;
90 }
91
discover(const DiscoveryInfo &)92 binder::Status MDnsService::discover(const DiscoveryInfo&) {
93 // TODO(b/298594687): switch to DEPRECATED.
94 return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
95 // DEPRECATED;
96 }
97
resolve(const ResolutionInfo &)98 binder::Status MDnsService::resolve(const ResolutionInfo&) {
99 // TODO(b/298594687): switch to DEPRECATED.
100 return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
101 // DEPRECATED;
102 }
103
getServiceAddress(const GetAddressInfo &)104 binder::Status MDnsService::getServiceAddress(const GetAddressInfo&) {
105 // TODO(b/298594687): switch to DEPRECATED.
106 return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
107 // DEPRECATED;
108 }
109
stopOperation(int32_t)110 binder::Status MDnsService::stopOperation(int32_t) {
111 // TODO(b/298594687): switch to DEPRECATED.
112 return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
113 // DEPRECATED;
114 }
115
registerEventListener(const android::sp<IMDnsEventListener> &)116 binder::Status MDnsService::registerEventListener(const android::sp<IMDnsEventListener>&) {
117 // TODO(b/298594687): switch to DEPRECATED.
118 return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
119 // DEPRECATED;
120 }
121
unregisterEventListener(const android::sp<IMDnsEventListener> &)122 binder::Status MDnsService::unregisterEventListener(const android::sp<IMDnsEventListener>&) {
123 // TODO(b/298594687): switch to DEPRECATED.
124 return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
125 // DEPRECATED;
126 }
127
128 } // namespace android::net
129