Android(安卓)P WiFi 连接以及获取 IP 流程
16lz
2022-07-23
文章目录
- wifi 连接&获取IP 流程图
- 代码流程
- 一、关联阶段
- 1. WifiSettings.submit -- > WifiManager
- 2. WifiSettings.submit -- > WifiManager
- 3. WifiServiceImpl --> WifiStateMachine
- 4. WifiStateMachine--> WifiStateMachine
- 5. WifiNative--> SupplicantStaIfaceHal --> WifMonitor
- 二、获取IP 阶段
- 6. WifMonitor --> WifiStateMachine
- 7. WifiStateMachine.ObtainingIpState
wifi 连接&获取IP 流程图
- Android 每一次版本迭代与更新,对于设备开发商来说都是挺痛苦的一件事,很多的东西需要移植,需要适配, - 年复一年,日复一日,bug不停,需求不停,尽管再累也是将一些重要的东西记录下来,分享给到大家, - 希望你们遇到相关问题,顺着流程图以及代码主线,找到原因(解决问题), - 老三样,先上流程图
代码流程
一、关联阶段
1. WifiSettings.submit – > WifiManager
- WifiSettings 干的事情比较简单,当在dialog完成ssid 以及密码填充后,直接call WifiManager save 即可
- WifiManager 收到Save 之后,就开始了wifi 连接之旅
packages/apps/Settings/src/com/android/settings/wifi/WifiSettings.javavoid submit(WifiConfigController configController){... mWifiManager.save(config, mSaveListener);}
2. WifiSettings.submit – > WifiManager
- WifiManager 这里相当于传达室,信件到了,然后按个铃铛,把信息传达给WifiSerivceImpl
- 主要是将SAVE_NETWORK 给到 WifiService(WifiServiceImpl 是真正干活的)
frameworks/base/wifi/java/android/net/wifi/WifiManager.javapublic void save(WifiConfiguration config, ActionListener listener) { getChannel().sendMessage(SAVE_NETWORK, 0, putListener(listener), config);}
3. WifiServiceImpl --> WifiStateMachine
- WifiServiceImpl又将 SAVE_NETWORK 送到中级cmd处理站: WifiStateMachine
- 这里扩展一下,如我们的移除热点(其实也通过Settings 将remove cmd 送到WifiServieImpl进行下一步传输)
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.javaprivate class ClientHandler extends WifiHandler {case WifiManager.SAVE_NETWORK:{mWifiStateMachine.sendMessage(Message.obtain(msg));}}
4. WifiStateMachine–> WifiStateMachine
- 从save network 连接热点
- 又一次转化, 转为CMD_START_CONNECT送到内部状态机(ConnectModeState )处理
- 送到WifiNative 进行处理Connect,回顾以上(Android 基本套路大框架还是不变的: apps – services – native – drv(kernel))
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiStateMachine.javapublic void startConnectToNetwork(int networkId, int uid, String bssid) {sendMessage(CMD_START_CONNECT, networkId, uid, bssid);}class ConnectModeState extends State {case WifiManager.SAVE_NETWORK: startConnectToNetwork(netId, message.sendingUid, SUPPLICANT_BSSID_ANY);// 连接热点case CMD_START_CONNECT:mWifiNative.connectToNetwork(mInterfaceName, config); // 转到wifiNative 进行connect }
5. WifiNative–> SupplicantStaIfaceHal --> WifMonitor
- SupplicantStaIfaceHal 添加网络,select (实则将connect 传给到 wpa_supplicant)
- wpa_supplicant完成一系列与路由器的之间的beacon帧(probe、assoc、4way-handshake 、group-handshake)后,再能取到路由器的颁发的认可证(既是拿到最后的compelted)
- 最后,通过wifiMonitor上报wpa_supplicant 任务已完成,既是完成连接的第一阶段(关联阶段)
- WiFiMonitor上报的事件既是,NETWORK_CONNECTION_EVENT (又一次回到WifiStateMachine)
frameworks/opt/net/wifi/service/java/com/android/server/wifi/SupplicantStaIfaceHal.java public boolean connectToNetwork(@NonNull String ifaceName, @NonNull WifiConfiguration config){ Pair pair = addNetworkAndSaveConfig(ifaceName, config); networkHandle.select(); }public void onStateChanged(int newState, byte[/* 6 */] bssid, int id,ArrayList ssid) {if (newSupplicantState == SupplicantState.COMPLETED){mWifiMonitor.broadcastNetworkConnectionEvent(mIfaceName, getCurrentNetworkId(mIfaceName), bssidStr);}}
二、获取IP 阶段
6. WifMonitor --> WifiStateMachine
- 由5的NETWORK_CONNECTION_EVENT 事件上报,又一次回到了WifiStateMachine
- 而且还是在ConnectModeState 状态机里,为啥?(又回到这里)
- 因为,1~5步只完成了关联,还有最后一步(要获取IP),拿到IP后才能算是一个有证的男人,
- 革命尚未成功,苦逼仍要继续(且看下面是如何获取IP …)
- 先是,广而告知(已取得真经),然后立马切换到mObtainingIpState状态机
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiStateMachine.javaclass ConnectModeState extends State {case WifiMonitor.NETWORK_CONNECTION_EVENT:.... sendNetworkStateChangeBroadcast(mLastBssid);transitionTo(mObtainingIpState);}
7. WifiStateMachine.ObtainingIpState
- ObtainingIpState 获取IP 的流程中规中矩,先是update 系统的State
- 停掉IpClient (自从Android N 后,获取IP已废弃了dhcpd,扶持了另一位的IpClient 、IpManager来完成自己的事业 )
- 清掉bssid以避免其影响到漫游导致断链
- Ipclient 开始接管舞台(启动获取IP), 后面有空(将把这部分详细讲讲的dhcp 协议以及常见的dhcp 问题),敬请期待
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiStateMachine.javaclass ObtainingIpState extends State {... setNetworkDetailedState(DetailedState.OBTAINING_IPADDR);clearTargetBssid("ObtainingIpAddress");stopIpClient();mIpClient.setHttpProxy(currentConfig.getHttpProxy());IpClient.buildProvisioningConfiguration(); .... }
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