65 lines
2.6 KiB
Java
65 lines
2.6 KiB
Java
/*
|
|
* Copyright 2010 Brave New Software Project, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.github.shadowsocks.utils;
|
|
|
|
import android.annotation.TargetApi;
|
|
import android.content.Context;
|
|
import android.net.ConnectivityManager;
|
|
import android.net.LinkProperties;
|
|
import android.os.Build;
|
|
|
|
import java.lang.reflect.Method;
|
|
import java.net.InetAddress;
|
|
import java.util.ArrayList;
|
|
import java.util.Collection;
|
|
|
|
public class Dns {
|
|
public static String getDnsResolver(Context context) throws Exception {
|
|
Collection<InetAddress> dnsResolvers = getDnsResolvers(context);
|
|
if (dnsResolvers.isEmpty()) {
|
|
throw new Exception("Couldn't find an active DNS resolver");
|
|
}
|
|
String dnsResolver = dnsResolvers.iterator().next().toString();
|
|
if (dnsResolver.startsWith("/")) {
|
|
dnsResolver = dnsResolver.substring(1);
|
|
}
|
|
return dnsResolver;
|
|
}
|
|
|
|
private static Collection<InetAddress> getDnsResolvers(Context context) throws Exception {
|
|
ArrayList<InetAddress> addresses = new ArrayList<InetAddress>();
|
|
ConnectivityManager connectivityManager =
|
|
(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
|
|
Class<?> LinkPropertiesClass = Class.forName("android.net.LinkProperties");
|
|
Method getActiveLinkPropertiesMethod = ConnectivityManager.class.getMethod("getActiveLinkProperties");
|
|
Object linkProperties = getActiveLinkPropertiesMethod.invoke(connectivityManager);
|
|
if (linkProperties != null) {
|
|
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
|
|
Method getDnsesMethod = LinkPropertiesClass.getMethod("getDnses");
|
|
Collection<?> dnses = (Collection<?>)getDnsesMethod.invoke(linkProperties);
|
|
for (Object dns : dnses) {
|
|
addresses.add((InetAddress)dns);
|
|
}
|
|
} else {
|
|
addresses.addAll(((LinkProperties) linkProperties).getDnsServers());
|
|
}
|
|
}
|
|
|
|
return addresses;
|
|
}
|
|
}
|