| /* |
| * Copyright (C) 2018 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. |
| */ |
| |
| #pragma once |
| |
| #include <list> |
| #include <map> |
| #include <mutex> |
| #include <vector> |
| |
| #include <android-base/thread_annotations.h> |
| |
| #include "DnsTlsServer.h" |
| |
| namespace android { |
| namespace net { |
| |
| // The DNS over TLS mode on a specific netId. |
| enum class PrivateDnsMode : uint8_t { OFF, OPPORTUNISTIC, STRICT }; |
| |
| // Validation status of a DNS over TLS server (on a specific netId). |
| enum class Validation : uint8_t { in_process, success, fail, unknown_server, unknown_netid }; |
| |
| struct PrivateDnsStatus { |
| PrivateDnsMode mode; |
| std::map<DnsTlsServer, Validation, AddressComparator> serversMap; |
| |
| std::list<DnsTlsServer> validatedServers() const { |
| std::list<DnsTlsServer> servers; |
| |
| for (const auto& pair : serversMap) { |
| if (pair.second == Validation::success) { |
| servers.push_back(pair.first); |
| } |
| } |
| return servers; |
| } |
| }; |
| |
| class PrivateDnsConfiguration { |
| public: |
| int set(int32_t netId, uint32_t mark, const std::vector<std::string>& servers, |
| const std::string& name, const std::string& caCert) EXCLUDES(mPrivateDnsLock); |
| |
| PrivateDnsStatus getStatus(unsigned netId) EXCLUDES(mPrivateDnsLock); |
| |
| void clear(unsigned netId) EXCLUDES(mPrivateDnsLock); |
| |
| private: |
| typedef std::map<DnsTlsServer, Validation, AddressComparator> PrivateDnsTracker; |
| |
| void validatePrivateDnsProvider(const DnsTlsServer& server, PrivateDnsTracker& tracker, |
| unsigned netId, uint32_t mark) REQUIRES(mPrivateDnsLock); |
| |
| bool recordPrivateDnsValidation(const DnsTlsServer& server, unsigned netId, bool success); |
| |
| // Start validation for newly added servers as well as any servers that have |
| // landed in Validation::fail state. Note that servers that have failed |
| // multiple validation attempts but for which there is still a validating |
| // thread running are marked as being Validation::in_process. |
| bool needsValidation(const PrivateDnsTracker& tracker, const DnsTlsServer& server); |
| |
| std::mutex mPrivateDnsLock; |
| std::map<unsigned, PrivateDnsMode> mPrivateDnsModes GUARDED_BY(mPrivateDnsLock); |
| // Structure for tracking the validation status of servers on a specific netId. |
| // Using the AddressComparator ensures at most one entry per IP address. |
| std::map<unsigned, PrivateDnsTracker> mPrivateDnsTransports GUARDED_BY(mPrivateDnsLock); |
| }; |
| |
| extern PrivateDnsConfiguration gPrivateDnsConfiguration; |
| |
| } // namespace net |
| } // namespace android |