Mike Yu | b601ff7 | 2018-11-01 20:07:00 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2018 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 | #ifndef NETD_RESOLV_PRIVATEDNSCONFIGURATION_H |
| 18 | #define NETD_RESOLV_PRIVATEDNSCONFIGURATION_H |
| 19 | |
| 20 | #include <list> |
| 21 | #include <map> |
| 22 | #include <vector> |
| 23 | |
| 24 | #include <android-base/thread_annotations.h> |
| 25 | |
| 26 | #include "DnsTlsServer.h" |
| 27 | #include "resolv.h" |
| 28 | |
| 29 | namespace android { |
| 30 | namespace net { |
| 31 | |
| 32 | struct PrivateDnsStatus { |
| 33 | PrivateDnsMode mode; |
| 34 | std::list<DnsTlsServer> validatedServers; |
| 35 | }; |
| 36 | |
| 37 | class PrivateDnsConfiguration { |
| 38 | public: |
| 39 | int set(int32_t netId, uint32_t mark, const std::vector<std::string>& servers, |
| 40 | const std::string& name, const std::set<std::vector<uint8_t>>& fingerprints); |
| 41 | |
| 42 | PrivateDnsStatus getStatus(unsigned netId); |
| 43 | |
| 44 | // Externally used for netd. |
| 45 | void getStatus(unsigned netId, ExternalPrivateDnsStatus* status); |
| 46 | |
| 47 | int getPrivateDnsModeAndStatus(unsigned netId); |
| 48 | void clear(unsigned netId); |
| 49 | void setCallback(private_dns_validated_callback callback); |
| 50 | |
| 51 | private: |
| 52 | typedef std::map<DnsTlsServer, Validation, AddressComparator> PrivateDnsTracker; |
| 53 | |
| 54 | void validatePrivateDnsProvider(const DnsTlsServer& server, PrivateDnsTracker& tracker, |
| 55 | unsigned netId, uint32_t mark) REQUIRES(mPrivateDnsLock); |
| 56 | |
| 57 | bool recordPrivateDnsValidation(const DnsTlsServer& server, unsigned netId, bool success); |
| 58 | |
| 59 | // Start validation for newly added servers as well as any servers that have |
| 60 | // landed in Validation::fail state. Note that servers that have failed |
| 61 | // multiple validation attempts but for which there is still a validating |
| 62 | // thread running are marked as being Validation::in_process. |
| 63 | bool needsValidation(const PrivateDnsTracker& tracker, const DnsTlsServer& server); |
| 64 | |
| 65 | std::mutex mPrivateDnsLock; |
| 66 | std::map<unsigned, PrivateDnsMode> mPrivateDnsModes GUARDED_BY(mPrivateDnsLock); |
| 67 | // Structure for tracking the validation status of servers on a specific netId. |
| 68 | // Using the AddressComparator ensures at most one entry per IP address. |
| 69 | std::map<unsigned, PrivateDnsTracker> mPrivateDnsTransports GUARDED_BY(mPrivateDnsLock); |
| 70 | private_dns_validated_callback mCallback = nullptr; |
| 71 | }; |
| 72 | |
| 73 | extern PrivateDnsConfiguration gPrivateDnsConfiguration; |
| 74 | |
| 75 | } // namespace net |
| 76 | } // namespace android |
| 77 | |
| 78 | #endif /* NETD_RESOLV_PRIVATEDNSCONFIGURATION_H */ |