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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
public class MacAddressProvider {
private static final ESLogger logger = Loggers.getLogger(MacAddressProvider.class);
private static byte[] getMacAddress() throws SocketException {
Enumeration en = NetworkInterface.getNetworkInterfaces();
if (en != null) {
while (en.hasMoreElements()) {
NetworkInterface nint = en.nextElement();
if (!nint.isLoopback()) {
// Pick the first valid non loopback address we find
byte[] address = nint.getHardwareAddress();
if (isValidAddress(address)) {
return address;
}
}
}
}
// Could not find a mac address
return null;
}
private static boolean isValidAddress(byte[] address) {
if (address == null || address.length != 6) {
return false;
}
for (byte b : address) {
if (b != 0x00) {
return true; // If any of the bytes are non zero assume a good address
}
}
return false;
}
public static byte[] getSecureMungedAddress() {
byte[] address = null;
try {
address = getMacAddress();
} catch (Throwable t) {
logger.warn("Unable to get mac address, will use a dummy address", t);
// address will be set below
}
if (!isValidAddress(address)) {
logger.warn("Unable to get a valid mac address, will use a dummy address");
address = constructDummyMulticastAddress();
}
byte[] mungedBytes = new byte[6];
SecureRandomHolder.INSTANCE.nextBytes(mungedBytes);
for (int i = 0; i < 6; ++i) {
mungedBytes[i] ^= address[i];
}
return mungedBytes;
}
private static byte[] constructDummyMulticastAddress() {
byte[] dummy = new byte[6];
SecureRandomHolder.INSTANCE.nextBytes(dummy);
/*
* Set the broadcast bit to indicate this is not a _real_ mac address
*/
dummy[0] |= (byte) 0x01;
return dummy;
}
}