93 lines
2.6 KiB
Java
93 lines
2.6 KiB
Java
/*
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* Copyright 2015-2016 the original author or authors
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*
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* This software is licensed under the Apache License, Version 2.0,
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* the GNU Lesser General Public License version 2 or later ("LGPL")
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* and the WTFPL.
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* You may choose either license to govern your use of this software only
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* upon the condition that you accept all of the terms of either
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* the Apache License 2.0, the LGPL 2.1+ or the WTFPL.
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*/
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package eu.siacs.conversations.utils;
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import de.measite.minidns.dnsserverlookup.AbstractDNSServerLookupMechanism;
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import de.measite.minidns.dnsserverlookup.AndroidUsingReflection;
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import de.measite.minidns.dnsserverlookup.DNSServerLookupMechanism;
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import de.measite.minidns.util.PlatformDetection;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.LineNumberReader;
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import java.net.InetAddress;
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import java.util.HashSet;
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import java.util.logging.Level;
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/**
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* Try to retrieve the list of DNS server by executing getprop.
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*/
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public class AndroidUsingExecLowPriority extends AbstractDNSServerLookupMechanism {
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public static final DNSServerLookupMechanism INSTANCE = new AndroidUsingExecLowPriority();
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public static final int PRIORITY = AndroidUsingReflection.PRIORITY + 1;
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private AndroidUsingExecLowPriority() {
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super(AndroidUsingExecLowPriority.class.getSimpleName(), PRIORITY);
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}
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@Override
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public String[] getDnsServerAddresses() {
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try {
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Process process = Runtime.getRuntime().exec("getprop");
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InputStream inputStream = process.getInputStream();
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LineNumberReader lnr = new LineNumberReader(
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new InputStreamReader(inputStream));
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String line;
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HashSet<String> server = new HashSet<>(6);
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while ((line = lnr.readLine()) != null) {
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int split = line.indexOf("]: [");
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if (split == -1) {
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continue;
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}
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String property = line.substring(1, split);
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String value = line.substring(split + 4, line.length() - 1);
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if (value.isEmpty()) {
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continue;
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}
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if (property.endsWith(".dns") || property.endsWith(".dns1") ||
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property.endsWith(".dns2") || property.endsWith(".dns3") ||
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property.endsWith(".dns4")) {
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// normalize the address
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InetAddress ip = InetAddress.getByName(value);
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if (ip == null) continue;
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value = ip.getHostAddress();
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if (value == null) continue;
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if (value.length() == 0) continue;
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server.add(value);
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}
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}
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if (server.size() > 0) {
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return server.toArray(new String[server.size()]);
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}
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} catch (IOException e) {
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LOGGER.log(Level.WARNING, "Exception in findDNSByExec", e);
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}
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return null;
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}
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@Override
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public boolean isAvailable() {
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return PlatformDetection.isAndroid();
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}
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}
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