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using actual dns servers provided by the system

This commit is contained in:
Daniel Gultsch 2014-03-25 17:21:56 +01:00
parent 10f2231bcf
commit 0b9e089ac6
1 changed files with 31 additions and 2 deletions
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33
src/eu/siacs/conversations/utils/DNSHelper.java
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@ -2,15 +2,45 @@ package eu.siacs.conversations.utils;
import java.io.ByteArrayOutputStream; import java.io.ByteArrayOutputStream;
import java.io.IOException; import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.DatagramPacket; import java.net.DatagramPacket;
import java.net.DatagramSocket; import java.net.DatagramSocket;
import java.net.InetAddress; import java.net.InetAddress;
import java.util.ArrayList;
import java.util.Random; import java.util.Random;
import android.os.Bundle; import android.os.Bundle;
import android.util.Log;
public class DNSHelper { public class DNSHelper {
public static Bundle getSRVRecord(String host) throws IOException { public static Bundle getSRVRecord(String host) throws IOException {
InetAddress ip = InetAddress.getByName("8.8.8.8");
try {
Class<?> SystemProperties = Class.forName("android.os.SystemProperties");
Method method = SystemProperties.getMethod("get", new Class[] { String.class });
ArrayList<String> servers = new ArrayList<String>();
for (String name : new String[] { "net.dns1", "net.dns2", "net.dns3", "net.dns4", }) {
String value = (String) method.invoke(null, name);
if (value != null && !"".equals(value) && !servers.contains(value))
ip = InetAddress.getByName(value);
servers.add(value);
}
} catch (ClassNotFoundException e) {
ip = InetAddress.getByName("8.8.8.8");
} catch (NoSuchMethodException e) {
ip = InetAddress.getByName("8.8.8.8");
} catch (IllegalAccessException e) {
ip = InetAddress.getByName("8.8.8.8");
} catch (IllegalArgumentException e) {
ip = InetAddress.getByName("8.8.8.8");
} catch (InvocationTargetException e) {
ip = InetAddress.getByName("8.8.8.8");
}
Log.d("xmppService","using dns server: "+ip.toString()+" to look up SRV records");
Bundle namePort = new Bundle(); Bundle namePort = new Bundle();
String[] hostParts = host.split("\\."); String[] hostParts = host.split("\\.");
byte[] transId = new byte[2]; byte[] transId = new byte[2];
@ -35,10 +65,9 @@ public class DNSHelper {
} }
output.write(rest); output.write(rest);
byte[] sendPaket = output.toByteArray(); byte[] sendPaket = output.toByteArray();
byte[] addr = { 0x8, 0x8, 0x8, 0x8 };
int realLenght = sendPaket.length - 11; int realLenght = sendPaket.length - 11;
DatagramPacket packet = new DatagramPacket(sendPaket, DatagramPacket packet = new DatagramPacket(sendPaket,
sendPaket.length, InetAddress.getByAddress(addr), 53); sendPaket.length, ip, 53);
DatagramSocket datagramSocket = new DatagramSocket(); DatagramSocket datagramSocket = new DatagramSocket();
datagramSocket.send(packet); datagramSocket.send(packet);
byte[] receiveData = new byte[1024]; byte[] receiveData = new byte[1024];