54 lines
1.8 KiB
Java
54 lines
1.8 KiB
Java
/**
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*
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* Copyright 2016-2019 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.test.util;
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import java.io.IOException;
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import java.net.BindException;
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import java.net.InetAddress;
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import java.net.ServerSocket;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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public class NetworkUtil {
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private static final Logger LOGGER = Logger.getLogger(NetworkUtil.class.getName());
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public static ServerSocket getSocketOnLoopback() throws IOException {
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final InetAddress loopbackAddress = InetAddress.getLoopbackAddress();
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final int portMin = 1024;
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final int portMax = (1 << 16) - 1;
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final int backlog = 1;
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ServerSocket serverSocket = null;
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for (int port = portMin; port <= portMax; port++) {
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try {
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serverSocket = new ServerSocket(port, backlog, loopbackAddress);
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break;
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} catch (BindException e) {
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LOGGER.log(Level.FINEST, "Could not bind port " + port + ", trying next", e);
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}
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}
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if (serverSocket == null) {
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throw new IOException("Could not bind any port between " + portMin + " and " + portMax
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+ " on loopback address" + loopbackAddress);
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}
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return serverSocket;
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}
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}
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