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Code Issues Releases Wiki Activity

Check DNS server addresses against LAN subnets

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This commit is contained in:
M66B 2019-09-10 19:16:28 +02:00
parent 812cd9c053
commit 652ec1a899
1 changed files with 19 additions and 25 deletions
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44
app/src/main/java/eu/faircode/netguard/ServiceSinkhole.java
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@ -66,6 +66,7 @@ import android.text.TextUtils;
import android.text.style.ForegroundColorSpan;
import android.text.style.StyleSpan;
import android.util.Log;
import android.util.Pair;
import android.util.TypedValue;
import android.widget.RemoteViews;
@ -88,8 +89,6 @@ import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.Socket;
import java.net.URL;
import java.net.UnknownHostException;
@ -99,7 +98,6 @@ import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
@ -1169,32 +1167,28 @@ public class ServiceSinkhole extends VpnService implements SharedPreferences.OnS
boolean use_hosts = prefs.getBoolean("use_hosts", false);
if (lan && use_hosts && filter)
try {
Enumeration<NetworkInterface> nis = NetworkInterface.getNetworkInterfaces();
if (nis != null)
while (nis.hasMoreElements()) {
NetworkInterface ni = nis.nextElement();
if (ni != null && ni.isUp() && !ni.isLoopback()) {
List<InterfaceAddress> ias = ni.getInterfaceAddresses();
if (ias != null)
for (InterfaceAddress ia : ias) {
InetAddress hostAddress = ia.getAddress();
BigInteger host = new BigInteger(1, hostAddress.getAddress());
List<Pair<InetAddress, Integer>> subnets = new ArrayList<>();
subnets.add(new Pair<>(InetAddress.getByName("10.0.0.0"), 8));
subnets.add(new Pair<>(InetAddress.getByName("172.16.0.0"), 12));
subnets.add(new Pair<>(InetAddress.getByName("192.168.0.0"), 16));
int prefix = ia.getNetworkPrefixLength();
BigInteger mask = BigInteger.valueOf(-1).shiftLeft(hostAddress.getAddress().length * 8 - prefix);
for (Pair<InetAddress, Integer> subnet : subnets) {
InetAddress hostAddress = subnet.first;
BigInteger host = new BigInteger(1, hostAddress.getAddress());
for (InetAddress dns : new ArrayList<>(listDns))
if (hostAddress.getAddress().length == dns.getAddress().length) {
BigInteger ip = new BigInteger(1, dns.getAddress());
int prefix = subnet.second;
BigInteger mask = BigInteger.valueOf(-1).shiftLeft(hostAddress.getAddress().length * 8 - prefix);
if (host.and(mask).equals(ip.and(mask))) {
Log.i(TAG, "Local DNS server host=" + hostAddress + "/" + prefix + " dns=" + dns);
listDns.remove(dns);
}
}
}
for (InetAddress dns : new ArrayList<>(listDns))
if (hostAddress.getAddress().length == dns.getAddress().length) {
BigInteger ip = new BigInteger(1, dns.getAddress());
if (host.and(mask).equals(ip.and(mask))) {
Log.i(TAG, "Local DNS server host=" + hostAddress + "/" + prefix + " dns=" + dns);
listDns.remove(dns);
}
}
}
}
} catch (Throwable ex) {
Log.e(TAG, ex.toString() + "\n" + Log.getStackTraceString(ex));
}