本文主要是介绍Android 13 有线以太网静态ip保存逻辑梳理分析,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
源码环境:高通Android 13
这里特别说明,Android13中,ipconfig.txt配置文件目录有改变
以前:/data/misc/ethernet/ipconfig.txt
最新的有线网配置文件保存目录:
/data/misc/apexdata/com.android.tethering/misc/ethernet/ipconfig.txt
一、Android 版本影响
首先就是Android 11 与 12 的有线网络版本差距还是比较大的,源码目录也变了,之前目录frameworks/opt/net/ethernet/java/com/android/server/ethernet,现在改成了packages/modules/Connectivity/service-t/src/com/android/server/ethernet,所以如果之前只在11上面适配过,那么对于12来说,适配还是需要花费一点功夫,具体的差异在之后的部分会记录,但是12与13的有线网络差异就较小了,并且看起来,13的以太网接口以及逻辑比12来说更为完善。
二、配置以太网所需要的类
配置以太网所需要的java类大概有以下几个,其实这几个类从Android9开始就是以太网配置的主要java类了
(1)、frameworks/base/core/java/android/net/EthernetManager.java
EthernetManager.java此是上层管理以太网的类,我们常通过context.getSystemService(Context.ETHERNET_SERVICE)获得他的实例对象
(2)、packages/modules/Connectivity/framework/src/android/net/IpConfiguration.java
这个类主要就是用来配置IP状态的,包括动态和静态
(3)、packages/modules/Connectivity/framework/src/android/net/StaticIpConfiguration.java
这个类主要就是用来配置静态IP的,这个类之前也是在frameworks/base/core/java/android/net/路径下,12里面也移到了packages/modules/Connectivity/framework/src/android/net/下
三、有线以太网静态ip保存逻辑从源码逐步分析
1、packages/modules/Connectivity/framework-t/src/android/net/EthernetManager.java public void setConfiguration(@NonNull String iface, @NonNull IpConfiguration config) {try {mService.setConfiguration(iface, config);//这里调用的是EthernetServiceImpl.java中的setConfiguration} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}2、packages/modules/Connectivity/service-t/src/com/android/server/ethernet/EthernetServiceImpl.java/*** Set Ethernet configuration*/@Overridepublic void setConfiguration(String iface, IpConfiguration config) {throwIfEthernetNotStarted();PermissionUtils.enforceNetworkStackPermission(mContext);if (mTracker.isRestrictedInterface(iface)) {PermissionUtils.enforceRestrictedNetworkPermission(mContext, TAG);}// TODO: this does not check proxy settings, gateways, etc.// Fix this by making IpConfiguration a complete representation of static configuration.mTracker.updateIpConfiguration(iface, new IpConfiguration(config));//这里更新保存}3、packages/modules/Connectivity/service-t/src/com/android/server/ethernet/EthernetTracker.java
EthernetTracker中主要做了以下两件事 :
(1). 首先更新 ip config的,这个和静态ip相关;
(2). 根据iface,调用addInterface创建interfacevoid updateIpConfiguration(String iface, IpConfiguration ipConfiguration) {if (DBG) {Log.i(TAG, "updateIpConfiguration, iface: " + iface + ", cfg: " + ipConfiguration);}writeIpConfiguration(iface, ipConfiguration);mHandler.post(() -> {mFactory.updateInterface(iface, ipConfiguration, null, null);broadcastInterfaceStateChange(iface);});}private void writeIpConfiguration(@NonNull final String iface,@NonNull final IpConfiguration ipConfig) {mConfigStore.write(iface, ipConfig);//这里调用了EthernetConfigStore.java中的writemIpConfigurations.put(iface, ipConfig);}4、packages/modules/Connectivity/service-t/src/com/android/server/ethernet/EthernetConfigStore.javaprivate static final String CONFIG_FILE = "ipconfig.txt";private static final String FILE_PATH = "/misc/ethernet/";private static final String APEX_IP_CONFIG_FILE_PATH = ApexEnvironment.getApexEnvironment(TETHERING_MODULE_NAME).getDeviceProtectedDataDir() + FILE_PATH;public void write(String iface, IpConfiguration config) {write(iface, config, APEX_IP_CONFIG_FILE_PATH + CONFIG_FILE);//注意:这里Android13调整了保存路径,全路径:/data/misc/apexdata/com.android.tethering/misc/ethernet/ipconfig.txt//Android 10版本保存路径为:/data/misc/ethernet/ipconfig.txt}void write(String iface, IpConfiguration config, String filepath) {boolean modified;synchronized (mSync) {if (config == null) {modified = mIpConfigurations.remove(iface) != null;} else {IpConfiguration oldConfig = mIpConfigurations.put(iface, config);modified = !config.equals(oldConfig);}if (modified) {mStore.writeIpConfigurations(filepath, mIpConfigurations);//这里调用的是IpConfigStore.java}}}5、packages/modules/Connectivity/service-t/src/com/android/server/net/IpConfigStore.java/*** Write the IP configuration associated to the target networks to the destination path.*/public void writeIpConfigurations(String filePath,ArrayMap<String, IpConfiguration> networks) {mWriter.write(filePath, out -> {out.writeInt(IPCONFIG_FILE_VERSION);for (int i = 0; i < networks.size(); i++) {writeConfig(out, networks.keyAt(i), networks.valueAt(i));}});}private static boolean writeConfig(DataOutputStream out, String configKey,IpConfiguration config) throws IOException {return writeConfig(out, configKey, config, IPCONFIG_FILE_VERSION);}//这里最终完成静态ip写到配置文件:/data/misc/apexdata/com.android.tethering/misc/ethernet/ipconfig.txtpublic static boolean writeConfig(DataOutputStream out, String configKey,IpConfiguration config, int version) throws IOException {boolean written = false;try {switch (config.getIpAssignment()) {case STATIC:out.writeUTF(IP_ASSIGNMENT_KEY);out.writeUTF(config.getIpAssignment().toString());StaticIpConfiguration staticIpConfiguration = config.getStaticIpConfiguration();if (staticIpConfiguration != null) {if (staticIpConfiguration.getIpAddress() != null) {LinkAddress ipAddress = staticIpConfiguration.getIpAddress();out.writeUTF(LINK_ADDRESS_KEY);out.writeUTF(ipAddress.getAddress().getHostAddress());out.writeInt(ipAddress.getPrefixLength());}if (staticIpConfiguration.getGateway() != null) {out.writeUTF(GATEWAY_KEY);out.writeInt(0); // Default route.out.writeInt(1); // Have a gateway.out.writeUTF(staticIpConfiguration.getGateway().getHostAddress());}for (InetAddress inetAddr : staticIpConfiguration.getDnsServers()) {out.writeUTF(DNS_KEY);out.writeUTF(inetAddr.getHostAddress());}}written = true;break;case DHCP:out.writeUTF(IP_ASSIGNMENT_KEY);out.writeUTF(config.getIpAssignment().toString());written = true;break;case UNASSIGNED:/* Ignore */break;default:loge("Ignore invalid ip assignment while writing");break;}switch (config.getProxySettings()) {case STATIC:ProxyInfo proxyProperties = config.getHttpProxy();String exclusionList = ProxyUtils.exclusionListAsString(proxyProperties.getExclusionList());out.writeUTF(PROXY_SETTINGS_KEY);out.writeUTF(config.getProxySettings().toString());out.writeUTF(PROXY_HOST_KEY);out.writeUTF(proxyProperties.getHost());out.writeUTF(PROXY_PORT_KEY);out.writeInt(proxyProperties.getPort());if (exclusionList != null) {out.writeUTF(EXCLUSION_LIST_KEY);out.writeUTF(exclusionList);}written = true;break;case PAC:ProxyInfo proxyPacProperties = config.getHttpProxy();out.writeUTF(PROXY_SETTINGS_KEY);out.writeUTF(config.getProxySettings().toString());out.writeUTF(PROXY_PAC_FILE);out.writeUTF(proxyPacProperties.getPacFileUrl().toString());written = true;break;case NONE:out.writeUTF(PROXY_SETTINGS_KEY);out.writeUTF(config.getProxySettings().toString());written = true;break;case UNASSIGNED:/* Ignore */break;default:loge("Ignore invalid proxy settings while writing");break;}if (written) {out.writeUTF(ID_KEY);if (version < 3) {out.writeInt(Integer.valueOf(configKey));} else {out.writeUTF(configKey);}}} catch (NullPointerException e) {loge("Failure in writing " + config + e);}out.writeUTF(EOS);return written;}
这篇关于Android 13 有线以太网静态ip保存逻辑梳理分析的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!