Android系统连接WIFI显示网络连接受限

2024-06-03 12:20| 来源: 网络整理| 查看: 265

问题描述

使用Android设备打开设置，选择WIFI输入正确密码连接，会显示已连接，无网络，然后变成网络连接受限，实际可以使用此WIFI进行上网。

问题分析

异常Log

D NetworkMonitor/100: PROBE_DNS www.google.com 107ms OK 104.244.46.85 D NetworkMonitor/100: PROBE_DNS connectivitycheck.gstatic.com 118ms OK 203.208.50.66 D NetworkMonitor/100: PROBE_HTTP http://connectivitycheck.gstatic.com/generate_204 time=35ms ret=302 request={Connection=[close], User-Agent=[Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.32 Safari/537.36]} headers={null=[HTTP/1.0 302 Moved Temporarily], Allow=[GET,POST,HEAD], Location=[http://10.10.1.2:8080/cn/index.html], MIME-Version=[1.0], Pragma=[No-Cache], Server=[AP Server 1.0], X-Android-Received-Millis=[1615220820212], X-Android-Response-Source=[NETWORK 302], X-Android-Selected-Protocol=[http/1.0], X-Android-Sent-Millis=[1615220820196]} D NetworkMonitor/100: PROBE_HTTPS https://www.google.com/generate_204 Probe failed with exception javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found. D NetworkMonitor/100: isCaptivePortal: isSuccessful()=false isPortal()=true RedirectUrl=http://10.10.1.2:8080/cn/index.html isPartialConnectivity()=false Time=172ms

从Log中可以看出来，连接WIFI会进行网络的校验，从而判断是否可用，HTTP校验成功，但是HTTPS校验失败，因此会显示网络连接受限，其连接过程中会出现短暂的已连接，无网络是正常现象。HTTPS校验的网址https://www.google.com/generate_204，由于在国内无法访问，所以会校验失败，可采取的做法是替换此网址。

packages/modules/NetworkStack/src/com/android/server/connectivity/NetworkMonitor.java #校验源码部分 private CaptivePortalProbeResult sendDnsAndHttpProbes(ProxyInfo proxy, URL url, int probeType) { // Pre-resolve the captive portal server host so we can log it. // Only do this if HttpURLConnection is about to, to avoid any potentially // unnecessary resolution. final String host = (proxy != null) ? proxy.getHost() : url.getHost(); // This method cannot safely report probe results because it might not be running on the // state machine thread. Reporting results here would cause races and potentially send // information to callers that does not make sense because the state machine has already // changed state. sendDnsProbe(host); return sendHttpProbe(url, probeType, null); } # HTTPS网址相关源码 private final URL mCaptivePortalHttpsUrl; mCaptivePortalHttpsUrl = makeURL(getCaptivePortalServerHttpsUrl()); public String getCaptivePortalServerHttpUrl() { return getSettingFromResource(mContext, R.string.config_captive_portal_http_url, R.string.default_captive_portal_http_url, CAPTIVE_PORTAL_HTTP_URL); } 解决方案 packages/modules/NetworkStack/res/values/config.xml http://connectivitycheck.gstatic.com/generate_204 - https://www.google.com/generate_204 + https://developers.google.cn/generate_204

网上还有另一种解法如下，就是关闭校验，此解法可以实现不显示网络连接受限的问题，但是在连接需要登陆的WIFI时，无法连接

frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java loadSetting(stmt, Settings.Global.LID_BEHAVIOR, defaultLidBehavior); loadStringSetting(stmt, Settings.Global.NTP_SERVER_2, R.string.def_ntp_server_2); + loadSetting(stmt, Global.CAPTIVE_PORTAL_MODE, Global.CAPTIVE_PORTAL_MODE_IGNORE);

关于captive_portal_mode的值 0：彻底禁用检测 1：检测到需要登录则弹窗提醒（默认值） 2：检测到需要登录则自动断开此热点并不再自动连接

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