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Fix self discovery

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Check address on broadcast reception and use only ipv4
This commit is contained in:
Arnaud Vergnet 2020-12-18 10:25:26 +01:00
parent 3b9f4f0a41
commit c4b2b55887
2 changed files with 38 additions and 8 deletions
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12
src/main/java/fr/insa/clavardator/network/NetDiscoverer.java
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@ -7,6 +7,8 @@ import org.jetbrains.annotations.Nullable;
import java.io.IOException;
import java.net.*;
import static fr.insa.clavardator.network.NetUtil.isLocalAddress;
public class NetDiscoverer {
private static final short DISCOVERY_PORT = 31593;
private static final short RESPONSE_PORT = 31594;
@ -51,10 +53,20 @@ public class NetDiscoverer {
broadcastListener.stopListening();
broadcastListener = new BroadcastListener((ipAddr, data) -> {
try {
if (!isLocalAddress(ipAddr)) {
if (onBroadcastReceived != null)
onBroadcastReceived.onBroadcastReceived(ipAddr, data);
responseSender = new ResponseSender(ipAddr, responseMessage, errorCallback);
responseSender.start();
} else {
Log.w(this.getClass().getSimpleName(), "Received broadcast from self");
}
} catch (SocketException e) {
Log.e(this.getClass().getSimpleName(), "Error getting local adresses", e);
if (errorCallback != null)
errorCallback.onError(e);
}
}, e -> {
if (errorCallback != null)
errorCallback.onError(e);

26
src/main/java/fr/insa/clavardator/network/NetUtil.java
View file

@ -1,15 +1,20 @@
package fr.insa.clavardator.network;
import fr.insa.clavardator.util.Log;
import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Objects;
import java.util.*;
public class NetUtil {
/**
* Lists all ipv4 broadcast addresses
*
* @return
* @throws SocketException
*/
public static List<InetAddress> listAllBroadcastAddresses() throws SocketException {
List<InetAddress> broadcastList = new ArrayList<>();
final Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
@ -26,6 +31,12 @@ public class NetUtil {
return broadcastList;
}
/**
* Lists all local Ipv4 addresses
*
* @return
* @throws SocketException
*/
public static List<InetAddress> listAllLocalAddresses() throws SocketException {
List<InetAddress> localList = new ArrayList<>();
final Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
@ -34,14 +45,21 @@ public class NetUtil {
NetworkInterface networkInterface = interfaces.nextElement();
if (!networkInterface.isLoopback() && networkInterface.isUp()) {
networkInterface.getInterfaceAddresses().stream()
.filter((i) -> Objects.nonNull(i.getBroadcast()))
.map(InterfaceAddress::getAddress)
.filter(Objects::nonNull)
.forEach(localList::add);
}
}
Log.v("NetUtil", "Local addresses: " + Arrays.toString(new List[]{localList}));
return localList;
}
public static boolean isLocalAddress(InetAddress address) throws SocketException {
final List<InetAddress> list = listAllLocalAddresses();
return list.stream().anyMatch((a) -> Arrays.equals(address.getAddress(), a.getAddress()));
}
public static int getIdFromIp(InetAddress ipAddr) {
byte[] addr = ipAddr.getAddress();
int id = 0;