Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 _DNS_DNSTLSTRANSPORT_H |
| 18 | #define _DNS_DNSTLSTRANSPORT_H |
| 19 | |
| 20 | #include <future> |
| 21 | #include <map> |
| 22 | #include <mutex> |
| 23 | #include <vector> |
| 24 | |
| 25 | #include <android-base/thread_annotations.h> |
| 26 | #include <android-base/unique_fd.h> |
Bernie Innocenti | ec4219b | 2019-01-30 11:16:36 +0900 | [diff] [blame] | 27 | #include <netdutils/Slice.h> |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 28 | |
| 29 | #include "DnsTlsQueryMap.h" |
| 30 | #include "DnsTlsServer.h" |
| 31 | #include "DnsTlsSessionCache.h" |
| 32 | #include "IDnsTlsSocket.h" |
| 33 | #include "IDnsTlsSocketObserver.h" |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 34 | |
| 35 | namespace android { |
| 36 | namespace net { |
| 37 | |
| 38 | class IDnsTlsSocketFactory; |
| 39 | |
| 40 | // Manages at most one DnsTlsSocket at a time. This class handles socket lifetime issues, |
| 41 | // such as reopening the socket and reissuing pending queries. |
Mike Yu | b601ff7 | 2018-11-01 20:07:00 +0800 | [diff] [blame] | 42 | class DnsTlsTransport : public IDnsTlsSocketObserver { |
| 43 | public: |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 44 | DnsTlsTransport(const DnsTlsServer& server, unsigned mark, |
Bernie Innocenti | ec4219b | 2019-01-30 11:16:36 +0900 | [diff] [blame] | 45 | IDnsTlsSocketFactory* _Nonnull factory) |
| 46 | : mMark(mark), mServer(server), mFactory(factory) {} |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 47 | ~DnsTlsTransport(); |
| 48 | |
| 49 | typedef DnsTlsServer::Response Response; |
| 50 | typedef DnsTlsServer::Result Result; |
| 51 | |
| 52 | // Given a |query|, this method sends it to the server and returns the result asynchronously. |
| 53 | std::future<Result> query(const netdutils::Slice query) EXCLUDES(mLock); |
| 54 | |
waynema | 0e73c2e | 2019-07-31 15:04:08 +0800 | [diff] [blame] | 55 | // Check that a given TLS server is fully working on the specified netid. |
| 56 | // This function is used in ResolverController to ensure that we don't enable DNS over TLS |
| 57 | // on networks where it doesn't actually work. |
Mike Yu | f48c3c7 | 2018-11-02 13:30:04 +0800 | [diff] [blame] | 58 | static bool validate(const DnsTlsServer& server, unsigned netid, uint32_t mark); |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 59 | |
| 60 | // Implement IDnsTlsSocketObserver |
| 61 | void onResponse(std::vector<uint8_t> response) override; |
| 62 | void onClosed() override EXCLUDES(mLock); |
| 63 | |
Bernie Innocenti | ec4219b | 2019-01-30 11:16:36 +0900 | [diff] [blame] | 64 | private: |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 65 | std::mutex mLock; |
| 66 | |
| 67 | DnsTlsSessionCache mCache; |
| 68 | DnsTlsQueryMap mQueries; |
| 69 | |
| 70 | const unsigned mMark; // Socket mark |
| 71 | const DnsTlsServer mServer; |
| 72 | IDnsTlsSocketFactory* _Nonnull const mFactory; |
| 73 | |
| 74 | void doConnect() REQUIRES(mLock); |
| 75 | |
| 76 | // doReconnect is used by onClosed. It runs on the reconnect thread. |
| 77 | void doReconnect() EXCLUDES(mLock); |
| 78 | std::unique_ptr<std::thread> mReconnectThread GUARDED_BY(mLock); |
| 79 | |
| 80 | // Used to prevent onClosed from starting a reconnect during the destructor. |
| 81 | bool mClosing GUARDED_BY(mLock) = false; |
| 82 | |
| 83 | // Sending queries on the socket is thread-safe, but construction/destruction is not. |
| 84 | std::unique_ptr<IDnsTlsSocket> mSocket GUARDED_BY(mLock); |
| 85 | |
| 86 | // Send a query to the socket. |
| 87 | bool sendQuery(const DnsTlsQueryMap::Query q) REQUIRES(mLock); |
| 88 | }; |
| 89 | |
| 90 | } // end of namespace net |
| 91 | } // end of namespace android |
| 92 | |
| 93 | #endif // _DNS_DNSTLSTRANSPORT_H |