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