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/*
* 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
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