Add MDnsService
- Register MDnsService as a native system service "mdns" which
can be used by NsdService to commnuicate with mdnsresponder.
This service is used to replace the NDC design between
NsdService and MDnsSdListener.
- A binder call interface for calling to MDnsSdListener.
- Move checkAnyPermssion() to BinderUtil.h which can be used by
any component.
Bug: 209894875
Test: cd system/netd ; atest
Change-Id: I3543c0ac8ac8da0030ad05baef4d0847730fcae8
diff --git a/server/MDnsService.cpp b/server/MDnsService.cpp
new file mode 100644
index 0000000..6fd3575
--- /dev/null
+++ b/server/MDnsService.cpp
@@ -0,0 +1,116 @@
+/**
+ * Copyright (c) 2022, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "MDnsService"
+
+#include "MDnsService.h"
+
+#include "binder_utils/BinderUtil.h"
+#include "binder_utils/NetdPermissions.h"
+
+#include <android-base/strings.h>
+#include <binder/Status.h>
+
+#include <string>
+#include <vector>
+
+using android::net::mdns::aidl::DiscoveryInfo;
+using android::net::mdns::aidl::GetAddressInfo;
+using android::net::mdns::aidl::IMDnsEventListener;
+using android::net::mdns::aidl::RegistrationInfo;
+using android::net::mdns::aidl::ResolutionInfo;
+
+namespace android::net {
+
+// TODO: DnsResolver has same macro definition but returns ScopedAStatus. Move these macros to
+// BinderUtil.h to do the same permission check.
+#define ENFORCE_ANY_PERMISSION(...) \
+ do { \
+ binder::Status status = checkAnyPermission({__VA_ARGS__}); \
+ if (!status.isOk()) { \
+ return status; \
+ } \
+ } while (0)
+
+#define ENFORCE_NETWORK_STACK_PERMISSIONS() \
+ ENFORCE_ANY_PERMISSION(PERM_NETWORK_STACK, PERM_MAINLINE_NETWORK_STACK)
+
+status_t MDnsService::start() {
+ IPCThreadState::self()->disableBackgroundScheduling(true);
+ const status_t ret = BinderService<MDnsService>::publish();
+ if (ret != android::OK) {
+ return ret;
+ }
+ return android::OK;
+}
+
+binder::Status MDnsService::startDaemon() {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::stopDaemon() {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::registerService(const RegistrationInfo& /*info*/) {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::discover(const DiscoveryInfo& /*info*/) {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::resolve(const ResolutionInfo& /*info*/) {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::getServiceAddress(const GetAddressInfo& /*info*/) {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::stopOperation(int32_t /*id*/) {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::registerEventListener(
+ const android::sp<IMDnsEventListener>& /*listener*/) {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+binder::Status MDnsService::unregisterEventListener(
+ const android::sp<IMDnsEventListener>& /*listener*/) {
+ ENFORCE_NETWORK_STACK_PERMISSIONS();
+ // default no-op
+ return binder::Status::ok();
+}
+
+} // namespace android::net