| /* |
| * Copyright (C) 2017 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. |
| * |
| */ |
| |
| #ifndef DNS_TLS_FRONTEND_H |
| #define DNS_TLS_FRONTEND_H |
| |
| #include <arpa/nameser.h> |
| |
| #include <atomic> |
| #include <mutex> |
| #include <string> |
| #include <thread> |
| #include <unordered_map> |
| #include <vector> |
| |
| #include <android-base/thread_annotations.h> |
| #include <android-base/unique_fd.h> |
| #include <openssl/ssl.h> |
| |
| namespace test { |
| |
| /* |
| * Simple DNS over TLS reverse proxy that forwards to a UDP backend. |
| * Only handles a single request at a time. |
| */ |
| class DnsTlsFrontend { |
| public: |
| DnsTlsFrontend(const std::string& listen_address, const std::string& listen_service, |
| const std::string& backend_address, const std::string& backend_service) |
| : listen_address_(listen_address), |
| listen_service_(listen_service), |
| backend_address_(backend_address), |
| backend_service_(backend_service) {} |
| ~DnsTlsFrontend() { stopServer(); } |
| const std::string& listen_address() const { return listen_address_; } |
| const std::string& listen_service() const { return listen_service_; } |
| bool running() const { return socket_ != -1; } |
| bool startServer(); |
| bool stopServer(); |
| int queries() const { return queries_; } |
| void clearQueries() { queries_ = 0; } |
| bool waitForQueries(int number, int timeoutMs) const; |
| void set_chain_length(int length) { chain_length_ = length; } |
| // Represents a fingerprint from the middle of the certificate chain. |
| const std::vector<uint8_t>& fingerprint() const { return fingerprint_; } |
| |
| private: |
| void requestHandler(); |
| bool handleOneRequest(SSL* ssl); |
| |
| // Trigger the handler thread to terminate. |
| bool sendToEventFd(); |
| |
| // Used in the handler thread for the termination signal. |
| void handleEventFd(); |
| |
| std::string listen_address_; |
| std::string listen_service_; |
| std::string backend_address_; |
| std::string backend_service_; |
| bssl::UniquePtr<SSL_CTX> ctx_; |
| // Socket on which the server is listening for a TCP connection with a client. |
| android::base::unique_fd socket_; |
| // Socket used to communicate with the backend DNS server. |
| android::base::unique_fd backend_socket_; |
| // Eventfd used to signal for the handler thread termination. |
| android::base::unique_fd event_fd_; |
| std::atomic<int> queries_ = 0; |
| std::thread handler_thread_ GUARDED_BY(update_mutex_); |
| std::mutex update_mutex_; |
| int chain_length_ = 1; |
| std::vector<uint8_t> fingerprint_; |
| }; |
| |
| } // namespace test |
| |
| #endif // DNS_TLS_FRONTEND_H |