[英]Check if a VPN connection is active in Android?
我的無根 Android 4.4 設備上有一個第三方 VPN 應用程序,我想編寫一個后台服務來監視 VPN 連接並在 VPN 連接斷開時提醒用戶。
有沒有辦法做到這一點? 我找不到任何使用 VPNService API 的方法。
感謝:D
使用NetworkCapabilities
對我NetworkCapabilities
。 您必須遍歷所有現有網絡並檢查哪個具有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));
}
這對我有用:從 API 16 到 23 測試:
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");
PS它也可以是另一個名為“ppp0”的網絡接口,但在我對不同VPN應用程序的測試中,它總是“tun0”
遲到的答案,在 Android 16 <-> 29
上測試:
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;
}
以上不適用於wireguard,因為接口名稱可以是任何內容(通常是連接名稱)。
檢查活動網絡是否正在使用 VPN 的替代方法:
Network activeNetwork = connectivityManager.getActiveNetwork();
NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(activeNetwork);
boolean vpnInUse = caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN);
這里是kotlin coroutines flow
解決方案
val isVpnActiveFlow = callbackFlow {
val connectivityManager =
context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
if (connectivityManager == null) {
channel.close(IllegalStateException("connectivity manager is null"))
return@callbackFlow
} else {
val callback = object : ConnectivityManager.NetworkCallback() {
override fun onAvailable(network: Network) {
channel.trySend(true)
}
override fun onLost(network: Network) {
channel.trySend(false)
}
}
connectivityManager.registerNetworkCallback(
//I have to investigate on this builder!
NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_VPN)
.removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
.build(),
callback
)
awaitClose {
connectivityManager.unregisterNetworkCallback(callback)
}
}
}
編寫一個點擊內部頁面或 ping 內部站點的小應用程序...
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();
或者
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;
檢查網絡信息如何? 如果一個人有一種 VPN,我會假設有一個 VPN 連接。
需要 ACCESS_NETWORK_STATE 權限。
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);
}
}
這也適用於 API < 21:
ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo[] infos=manager.getAllNetworkInfo();
boolean VPNConnected = false;
for (NetworkInfo info : infos){
if ("VPN".equalsIgnoreCase(info.getTypeName()){
if (info.getState() == NetworkInfo.State.CONNECTED){
VPNConnected = true;
break;
}
}
}
我為自己編寫了一個適用於 API 21 及更高版本的輔助函數。
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;
}
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