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/*
* SonarQube
* Copyright (C) 2009-2016 SonarSource SA
* mailto:contact AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package util;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.util.HashSet;
import java.util.Set;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.ArrayUtils;
public final class NetworkUtils {
private static final RandomPortFinder RANDOM_PORT_FINDER = new RandomPortFinder();
private NetworkUtils() {
// only statics
}
public static int getNextAvailablePort() {
return RANDOM_PORT_FINDER.getNextAvailablePort();
}
static class RandomPortFinder {
private static final int MAX_TRY = 10;
// Firefox blocks some reserved ports : http://www-archive.mozilla.org/projects/netlib/PortBanning.html
private static final int[] BLOCKED_PORTS = {2049, 4045, 6000};
private final Set<Integer> usedPorts = new HashSet<>();
public int getNextAvailablePort() {
for (int i = 0; i < MAX_TRY; i++) {
try {
int port = getRandomUnusedPort();
if (isValidPort(port) && !usedPorts.contains(port)) {
usedPorts.add(port);
return port;
}
} catch (Exception e) {
throw new IllegalStateException("Can't find an open network port", e);
}
}
throw new IllegalStateException("Can't find an open network port");
}
public int getRandomUnusedPort() throws IOException {
ServerSocket socket = null;
try {
socket = new ServerSocket();
socket.bind(new InetSocketAddress("localhost", 0));
return socket.getLocalPort();
} catch (IOException e) {
throw new IllegalStateException("Can not find a free network port", e);
} finally {
IOUtils.closeQuietly(socket);
}
}
public static boolean isValidPort(int port) {
return port > 1023 && !ArrayUtils.contains(BLOCKED_PORTS, port);
}
}
}
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