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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.jdk.core.util.network;
import java.io.IOException;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.ServerSocket;
import org.eclipse.osee.framework.jdk.core.util.OseeProperties;
/**
* @author Andrew M. Finkbeiner
*/
public class PortUtil {
private static PortUtil singleton;
@SuppressWarnings("unused")
private ServerSocket ss;
public static PortUtil getInstance() {
if (singleton == null) {
singleton = new PortUtil();
}
return singleton;
}
int basePort = 18000;
int nextPort = 18000;
private PortUtil() {
basePort = nextPort = OseeProperties.getOseePortScannerStartPort();
for (int j = nextPort; j < 64000; j += 250) {
if (checkIfPortIsTaken(j)) {
basePort = nextPort = j;
try {
ss = new ServerSocket(basePort);
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
public void computeNewBasePort() {
basePort = nextPort = basePort + 1000;
for (int j = nextPort; j < 64000; j += 250) {
if (checkIfPortIsTaken(j)) {
basePort = nextPort = j;
try {
ss = new ServerSocket(basePort);
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
public int getValidPort() throws IOException {
int port = getConsecutiveValidPorts(1);
return port;
}
public int getConsecutiveValidPorts(int numberOfPorts) throws IOException {
try {
int returnVal = getConsecutiveLocalPorts(numberOfPorts);
nextPort = returnVal + numberOfPorts;
return returnVal;
} catch (Exception e) {
e.printStackTrace();
IOException ioE = new IOException("Unable to get a valid port.");
ioE.initCause(e);
throw ioE;
}
}
/**
* @param numberOfPorts The number of consecutive available ports to find
* @return The port of first number in the sequence of valid ports
*/
private int getConsecutiveLocalPorts(int numberOfPorts) throws Exception {
if (nextPort >= basePort + 250 - numberOfPorts) {
nextPort = basePort;
}
for (int i = nextPort, count = 1; i < basePort + 250; i++, count++) {
boolean passed = true;
for (int j = i; j < numberOfPorts + i; j++) {
if (!checkIfPortIsTaken(j)) {
passed = false;
break;
}
}
if (passed) {
return i;
}
}
throw new Exception("Unable to find valid port.");
}
private boolean checkIfPortIsTaken(int port) {
return checkTcpIp(port) && checkUdpPort(port);
}
private boolean checkTcpIp(int port) {
try {
ServerSocket socket;
socket = new ServerSocket(port);
socket.close();
} catch (Exception e) {
return false;
}
return true;
}
private boolean checkUdpPort(int port) {
try {
DatagramSocket ds = new DatagramSocket(port, InetAddress.getLocalHost());
ds.close();
ds.disconnect();
} catch (Exception e) {
return false;
}
return true;
}
}
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