| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.omid; |
| |
| import java.io.IOException; |
| import java.net.*; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class NetworkUtils { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(NetworkUtils.class); |
| |
| private static final String LINUX_TSO_NET_IFACE_PREFIX = "eth"; |
| private static final String MAC_TSO_NET_IFACE_PREFIX = "en"; |
| |
| public static String getDefaultNetworkInterface() { |
| |
| try (DatagramSocket s=new DatagramSocket()) { |
| s.connect(InetAddress.getByAddress(new byte[]{1,1,1,1}), 0); |
| return NetworkInterface.getByInetAddress(s.getLocalAddress()).getName(); |
| } catch (Exception e) { |
| //fall through |
| } |
| |
| //Fall back to old logic |
| try { |
| Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces(); |
| String fallBackName = null; |
| while (networkInterfaces.hasMoreElements()) { |
| NetworkInterface nextElement = networkInterfaces.nextElement(); |
| String name = nextElement.getDisplayName(); |
| LOG.info("Iterating over network interfaces, found '{}'", name); |
| boolean hasInet = Collections.list(nextElement.getInetAddresses()).size() > 1; // Checking that inet exists, to avoid taking iBridge |
| if (hasInet && fallBackName == null) { |
| fallBackName = name; |
| } |
| if ((name.startsWith(MAC_TSO_NET_IFACE_PREFIX) && hasInet ) || |
| name.startsWith(LINUX_TSO_NET_IFACE_PREFIX)) { |
| return name; |
| } |
| } |
| if (fallBackName != null) { |
| return fallBackName; |
| } |
| } catch (SocketException ignored) { |
| throw new RuntimeException("Failed to find any network interfaces", ignored); |
| } |
| |
| throw new IllegalArgumentException(String.format("No network '%s*'/'%s*' interfaces found", |
| MAC_TSO_NET_IFACE_PREFIX, LINUX_TSO_NET_IFACE_PREFIX)); |
| } |
| |
| /** |
| * Picks a free port on the host by binding a Socket to '0'. |
| */ |
| public static int getFreePort() throws IOException { |
| ServerSocket s = new ServerSocket(0); |
| try { |
| s.setReuseAddress(true); |
| int port = s.getLocalPort(); |
| return port; |
| } finally { |
| if (null != s) { |
| s.close(); |
| } |
| } |
| } |
| |
| } |