| /* |
| * 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.ftpserver.impl; |
| |
| import java.io.IOException; |
| import java.net.ServerSocket; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Random; |
| import java.util.Set; |
| import java.util.StringTokenizer; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * <strong>Internal class, do not use directly.</strong> |
| * |
| * Provides support for parsing a passive ports string as well as keeping track |
| * of reserved passive ports. |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| public class PassivePorts { |
| |
| private Logger log = LoggerFactory.getLogger(PassivePorts.class); |
| |
| private static final int MAX_PORT = 65535; |
| |
| private static final Integer MAX_PORT_INTEGER = Integer.valueOf(MAX_PORT); |
| |
| private List<Integer> freeList; |
| |
| private Set<Integer> usedList; |
| |
| private Random r = new Random(); |
| |
| private String passivePortsString; |
| |
| private boolean checkIfBound; |
| |
| /** |
| * Parse a string containing passive ports |
| * |
| * @param portsString |
| * A string of passive ports, can contain a single port (as an |
| * integer), multiple ports seperated by commas (e.g. |
| * 123,124,125) or ranges of ports, including open ended ranges |
| * (e.g. 123-125, 30000-, -1023). Combinations for single ports |
| * and ranges is also supported. |
| * @return A list of Integer objects, based on the parsed string |
| * @throws IllegalArgumentException |
| * If any of of the ports in the string is invalid (e.g. not an |
| * integer or too large for a port number) |
| */ |
| private static Set<Integer> parse(final String portsString) { |
| Set<Integer> passivePortsList = new HashSet<Integer>(); |
| |
| boolean inRange = false; |
| Integer lastPort = Integer.valueOf(1); |
| StringTokenizer st = new StringTokenizer(portsString, ",;-", true); |
| while (st.hasMoreTokens()) { |
| String token = st.nextToken().trim(); |
| |
| if (",".equals(token) || ";".equals(token)) { |
| if (inRange) { |
| fillRange(passivePortsList, lastPort, MAX_PORT_INTEGER); |
| } |
| |
| // reset state |
| lastPort = Integer.valueOf(1); |
| inRange = false; |
| } else if ("-".equals(token)) { |
| inRange = true; |
| } else if (token.length() == 0) { |
| // ignore whitespace |
| } else { |
| Integer port = Integer.valueOf(token); |
| |
| verifyPort(port); |
| |
| if (inRange) { |
| // add all numbers from last int |
| fillRange(passivePortsList, lastPort, port); |
| |
| inRange = false; |
| } |
| |
| addPort(passivePortsList, port); |
| |
| lastPort = port; |
| } |
| } |
| |
| if (inRange) { |
| fillRange(passivePortsList, lastPort, MAX_PORT_INTEGER); |
| } |
| |
| return passivePortsList; |
| } |
| |
| /** |
| * Fill a range of ports |
| */ |
| private static void fillRange(final Set<Integer> passivePortsList, final Integer beginPort, final Integer endPort) { |
| for (int i = beginPort; i <= endPort; i++) { |
| addPort(passivePortsList, Integer.valueOf(i)); |
| } |
| } |
| |
| /** |
| * Add a single port if not already in list |
| */ |
| private static void addPort(final Set<Integer> passivePortsList, final Integer port) { |
| passivePortsList.add(port); |
| } |
| |
| /** |
| * Verify that the port is within the range of allowed ports |
| */ |
| private static void verifyPort(final int port) { |
| if (port < 0) { |
| throw new IllegalArgumentException("Port can not be negative: " + port); |
| } else if (port > MAX_PORT) { |
| throw new IllegalArgumentException("Port too large: " + port); |
| } |
| } |
| |
| public PassivePorts(final String passivePorts, boolean checkIfBound) { |
| this(parse(passivePorts), checkIfBound); |
| |
| this.passivePortsString = passivePorts; |
| } |
| |
| public PassivePorts(Set<Integer> passivePorts, boolean checkIfBound) { |
| if (passivePorts == null) { |
| throw new NullPointerException("passivePorts can not be null"); |
| } else if(passivePorts.isEmpty()) { |
| passivePorts = new HashSet<Integer>(); |
| passivePorts.add(0); |
| } |
| |
| this.freeList = new ArrayList<Integer>(passivePorts); |
| this.usedList = new HashSet<Integer>(passivePorts.size()); |
| |
| this.checkIfBound = checkIfBound; |
| } |
| |
| /** |
| * Checks that the port of not bound by another application |
| */ |
| private boolean checkPortUnbound(int port) { |
| // is this check disabled? |
| if (!checkIfBound) { |
| return true; |
| } |
| |
| // if using 0 port, it will always be available |
| if (port == 0) { |
| return true; |
| } |
| |
| ServerSocket ss = null; |
| try { |
| ss = new ServerSocket(port); |
| ss.setReuseAddress(true); |
| return true; |
| } catch (IOException e) { |
| // port probably in use, check next |
| return false; |
| } finally { |
| if (ss != null) { |
| try { |
| ss.close(); |
| } catch (IOException e) { |
| // could not close, check next |
| return false; |
| } |
| } |
| } |
| } |
| |
| public synchronized int reserveNextPort() { |
| // create a copy of the free ports, so that we can keep track of the tested ports |
| List<Integer> freeCopy = new ArrayList<Integer>(freeList); |
| |
| // Loop until we have found a port, or exhausted all available ports |
| while (freeCopy.size() > 0) { |
| // Otherwise, pick one at random |
| int i = r.nextInt(freeCopy.size()); |
| Integer ret = freeCopy.get(i); |
| |
| if (ret == 0) { |
| // "Any" port should not be removed from our free list, |
| // nor added to the used list |
| return 0; |
| |
| } else if (checkPortUnbound(ret)) { |
| // Not used by someone else, so lets reserve it and return it |
| freeList.remove(i); |
| usedList.add(ret); |
| return ret; |
| |
| } else { |
| freeCopy.remove(i); |
| // log port unavailable, but left in pool |
| log.warn("Passive port in use by another process: " + ret); |
| } |
| } |
| |
| return -1; |
| } |
| |
| public synchronized void releasePort(final int port) { |
| if (port == 0) { |
| // Ignore port 0 being released, |
| // since its not put on the used list |
| |
| } else if (usedList.remove(port)) { |
| freeList.add(port); |
| |
| } else { |
| // log attempt to release unused port |
| log.warn("Releasing unreserved passive port: " + port); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| if (passivePortsString != null) { |
| return passivePortsString; |
| } |
| |
| StringBuilder sb = new StringBuilder(); |
| |
| for (Integer port : freeList) { |
| sb.append(port); |
| sb.append(","); |
| } |
| // remove the last , |
| sb.deleteCharAt(sb.length() - 1); |
| return sb.toString(); |
| } |
| |
| } |