94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <libnl++/Socket.h>
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#include <mutex>
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#include <thread>
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namespace android::nlinterceptor {
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class InterceptorRelay {
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public:
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/**
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* Wrapper around the netlink socket and thread which relays messages.
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*
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* \param nlFamily - netlink family to use for the netlink socket.
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* \param clientNlPid - pid of the client netlink socket.
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* \param clientName - name of the client to be used for debugging.
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*/
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InterceptorRelay(uint32_t nlFamily, uint32_t clientNlPid,
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const std::string& clientName);
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/**
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* Stops the relay thread if running and destroys itself.
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*/
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~InterceptorRelay();
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/**
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* Returns the PID of the internal Netlink socket.
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*
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* \return value of PID,
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*/
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uint32_t getPid();
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/**
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* Spawns relay thread.
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*/
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bool start();
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/**
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* Subscribes the internal socket to a single Netlink multicast group.
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*
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* \param nlGroup - Netlink group to subscribe to.
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* \returns - true for success, false for failure.
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*/
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bool subscribeGroup(uint32_t nlGroup);
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/**
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* Unsubscribes the internal socket from a single Netlink multicast group.
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*
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* \param nlGroup - Netlink group to unsubscribe from.
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* \returns - true for success, false for failure.
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*/
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bool unsubscribeGroup(uint32_t nlGroup);
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private:
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std::string mClientName; ///< Name of client (Wificond, for example).
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std::optional<nl::Socket> mNlSocket;
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const uint32_t mClientNlPid = 0; ///< pid of client NL socket.
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/**
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* If set to true, the relay thread should be running. Setting this to false
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* stops the relay thread.
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*/
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std::atomic_bool mRunning = false;
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/**
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* Reads incoming Netlink messages destined for mNlSocket. If from the
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* kernel, the message is relayed to the client specified in the
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* constructor. Otherwise, the message is relayed to the kernel. This will
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* run as long as mRunning is set to true.
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*/
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void relayMessages();
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std::thread mRelayThread;
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};
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} // namespace android::nlinterceptor
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