| /* |
| * 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 NETD_SERVER_IPTABLES_RESTORE_CONTROLLER_H |
| #define NETD_SERVER_IPTABLES_RESTORE_CONTROLLER_H |
| |
| #include <memory> |
| #include <mutex> |
| #include <sys/types.h> |
| |
| #include "NetdConstants.h" |
| |
| class IptablesProcess; |
| |
| class IptablesRestoreInterface { |
| public: |
| virtual ~IptablesRestoreInterface() = default; |
| |
| // Execute |commands| on the given |target|, and populate |output| with stdout. |
| virtual int execute(const IptablesTarget target, const std::string& commands, |
| std::string* output) = 0; |
| }; |
| |
| class IptablesRestoreController final : public IptablesRestoreInterface { |
| public: |
| // Not for general use. Use gCtls->iptablesRestoreCtrl |
| // to get an instance of this class. |
| IptablesRestoreController(); |
| |
| ~IptablesRestoreController() override; |
| |
| int execute(const IptablesTarget target, const std::string& commands, |
| std::string* output) override; |
| |
| enum IptablesProcessType { |
| IPTABLES_PROCESS, |
| IP6TABLES_PROCESS, |
| INVALID_PROCESS = -1, |
| }; |
| |
| // Called by the SIGCHLD signal handler when it detects that one |
| // of the forked iptables[6]-restore process has died. |
| IptablesProcessType notifyChildTermination(pid_t pid); |
| |
| protected: |
| friend class IptablesRestoreControllerTest; |
| pid_t getIpRestorePid(const IptablesProcessType type); |
| |
| // The maximum number of times we poll(2) for a response on our set of polled |
| // fds. Chosen so that the overall timeout is 5s. The timeout is so high because |
| // our version of iptables still polls every second in xtables_lock. |
| static int MAX_RETRIES; |
| |
| // The timeout (in millis) for each call to poll. The maximum wait is |
| // |POLL_TIMEOUT_MS * MAX_RETRIES|. Chosen so that the overall timeout is 1s. |
| static int POLL_TIMEOUT_MS; |
| |
| void Init(); |
| |
| private: |
| static IptablesProcess* forkAndExec(const IptablesProcessType type); |
| |
| int sendCommand(const IptablesProcessType type, const std::string& command, |
| std::string *output); |
| |
| static bool drainAndWaitForAck(const std::unique_ptr<IptablesProcess> &process, |
| const std::string& command, |
| std::string *output); |
| |
| static void maybeLogStderr(const std::unique_ptr<IptablesProcess> &process, |
| const std::string& command); |
| |
| // Guards calls to execute(). |
| std::mutex mLock; |
| |
| std::unique_ptr<IptablesProcess> mIpRestore; |
| std::unique_ptr<IptablesProcess> mIp6Restore; |
| }; |
| |
| #endif // NETD_SERVER_IPTABLES_RESTORE_CONTROLLER_H |