67 lines
2.4 KiB
Kotlin
67 lines
2.4 KiB
Kotlin
/*
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* Twidere - Twitter client for Android
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*
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* Copyright (C) 2012-2017 Mariotaku Lee <mariotaku.lee@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.mariotaku.twidere.util.net
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import android.annotation.SuppressLint
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import android.content.Context
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import android.net.ConnectivityManager
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import android.os.Build
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import android.support.annotation.RequiresApi
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import org.mariotaku.twidere.extension.activateNetworkCompat
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import java.net.InetAddress
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object SystemDnsFetcher {
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val impl = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
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DnsFetcherBase()
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} else {
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DnsFetcherLollipop()
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}
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fun get(context: Context): List<String>? {
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return impl.get(context)
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}
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open class DnsFetcherBase {
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@SuppressLint("PrivateApi")
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open fun get(context: Context): List<String>? {
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try {
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val SystemProperties = Class.forName("android.os.SystemProperties")
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val method = SystemProperties.getMethod("get", String::class.java)
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val netdns = arrayOf("net.dns1", "net.dns2", "net.dns3", "net.dns4")
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return netdns.mapNotNull { key ->
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return@mapNotNull method(null, key) as? String
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}
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} catch (e: Exception) {
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return null
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}
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}
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}
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@RequiresApi(Build.VERSION_CODES.LOLLIPOP)
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class DnsFetcherLollipop : DnsFetcherBase() {
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override fun get(context: Context): List<String>? {
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val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
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val activeNetwork = cm.activateNetworkCompat ?: return null
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return cm.getLinkProperties(activeNetwork)?.dnsServers?.map(InetAddress::getHostAddress)
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}
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}
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} |