检查 Android 中的 VPN 连接是否处于活动状态？

Question

我在我的无根 Android 4.4 设备上安装了第三方 VPN 应用，并且想编写一个后台服务来监控 VPN 连接并在 VPN 连接中断时提醒用户。

有没有办法做到这一点？我找不到任何使用 VPNService API 的方法。

谢谢-D

Answer 1

迟到的答案，在 Android 上测试16 <-> 29：

public boolean vpn() {
    String iface = "";
    try {
        for (NetworkInterface networkInterface : Collections.list(NetworkInterface.getNetworkInterfaces())) {
            if (networkInterface.isUp())
                iface = networkInterface.getName();
                Log.d("DEBUG", "IFACE NAME: " + iface);
            if ( iface.contains("tun") || iface.contains("ppp") || iface.contains("pptp")) {
                return true;
            }
        }
    } catch (SocketException e1) {
        e1.printStackTrace();
    }

    return false;
}

---

上述内容不适用于wireguard，因为接口名称可以是任何名称（通常是连接名称）。

Answer 2

我为自己编写了一个支持 API 21 及更高版本的辅助函数。

public static boolean vpnActive(Context context){

        //this method doesn't work below API 21
        if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
            return false;

        boolean vpnInUse = false;

        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);


        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {

            Network activeNetwork = connectivityManager.getActiveNetwork();
            NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(activeNetwork);

            return caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN);
        }

        Network[] networks = connectivityManager.getAllNetworks();

        for(int i = 0; i < networks.length; i++) {

            NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(networks[i]);
        if(caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN)) {
            vpnInUse = true;
            break;
        }
    }

    return vpnInUse;
}

Answer 3

这对我有用： 从 API 16 到 23 测试：

List<String> networkList = new ArrayList<>();
try {
    for (NetworkInterface networkInterface : Collections.list(NetworkInterface.getNetworkInterfaces())) {
        if (networkInterface.isUp())
            networkList.add(networkInterface.getName());
    }
} catch (Exception ex) {
    Timber.d("isVpnUsing Network List didn't received");
}

return networkList.contains("tun0");

附：它也可以是另一个名为“ppp0”的网络接口，但在我对不同 VPN 应用程序的测试中，它始终是“tun0”

Answer 4

检查活动网络是否正在使用 VPN 的替代方法：

Network activeNetwork = connectivityManager.getActiveNetwork();
NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(activeNetwork);
boolean vpnInUse = caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN);

Answer 5

查看网络信息怎么样？如果一个人有一种 VPN，我会假设有一个 VPN 连接。

需要 ACCESS_NETWORK_STATE 权限。

            List<NetworkInfo> connectedNetworks    = new ArrayList<>();

        if (Build.VERSION.SDK_INT >= 21)
            {
            Network[] networks = m_ConnectivityManager.getAllNetworks();

            for (Network n : networks)
                {
                NetworkInfo ni = m_ConnectivityManager.getNetworkInfo(n);

                if (ni.isConnectedOrConnecting())
                    {
                    connectedNetworks.add(ni);
                    }
                }
            }
        else
            {
            NetworkInfo[] nis = m_ConnectivityManager.getAllNetworkInfo();

            for (NetworkInfo ni : nis)
                {
                if (ni.isConnectedOrConnecting())
                    {
                    connectedNetworks.add(ni);
                    }
                }
            }

        boolean bHasVPN = false;

        if (Build.VERSION.SDK_INT >= 21)
            {
            for (NetworkInfo ni : connectedNetworks)
                {
                bHasVPN |= (ni.getType() == ConnectivityManager.TYPE_VPN);
                }
            }

Answer 6

使用NetworkCapabilities 对我有用。您必须遍历所有现有网络并检查哪个有 VPN_TRANSPORT

ConnectivityManager cm = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
Network[] networks = cm.getAllNetworks();

Log.i(TAG, "Network count: " + networks.length);
for(int i = 0; i < networks.length; i++) {

  NetworkCapabilities caps = cm.getNetworkCapabilities(networks[i]);

  Log.i(TAG, "Network " + i + ": " + networks[i].toString());
  Log.i(TAG, "VPN transport is: " + caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN));
  Log.i(TAG, "NOT_VPN capability is: " + caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN));

}

Answer 7

编写一个点击内部页面或 ping 内部站点的小应用程序...

HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(internal_url);
HttpResponse response = client.execute(request);

String html = "";
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder str = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null)
{
    str.append(line);
}
in.close();
html = str.toString();

或

String str = "";
try 
{
    Process process = Runtime.getRuntime().exec(
            "/system/bin/ping -c 8 " + internal_url);
    BufferedReader reader = new BufferedReader(new InputStreamReader(
            process.getInputStream()));
    int i;
    char[] buffer = new char[4096];
    StringBuffer output = new StringBuffer();
    while ((i = reader.read(buffer)) > 0)
        output.append(buffer, 0, i);
    reader.close();


    str = output.toString();

} 
catch (IOException e)
{

    e.printStackTrace();
}
return str;