Java tutorial
/* * The MIT License * * Copyright 2015 iychoi. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package stargate.commons.utils; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.InetAddress; import java.net.MalformedURLException; import java.net.NetworkInterface; import java.net.SocketException; import java.net.URL; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.Enumeration; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * * @author iychoi */ public class IPUtils { private static final Log LOG = LogFactory.getLog(IPUtils.class); private static String cached_public_ip; private static List<String> cached_host_addr = new ArrayList<String>(); private static List<String> cached_ip_addr = new ArrayList<String>(); private static final String IPADDRESS_PATTERN = "^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])$"; private static final String DOMAINNAME_PATTERN = "^((?!-)[A-Za-z0-9-]{1,63}(?<!-)\\.)+[A-Za-z]{2,6}$"; private static Pattern IP_pattern = Pattern.compile(IPADDRESS_PATTERN); private static Pattern Domain_pattern = Pattern.compile(DOMAINNAME_PATTERN); private static boolean isProperHostAddress(String addr) { if (addr == null || addr.isEmpty()) { return false; } if (addr.equalsIgnoreCase("localhost")) { return false; } else if (addr.equalsIgnoreCase("ip6-localhost")) { return false; } else if (addr.equalsIgnoreCase("127.0.0.1")) { return false; } else if (addr.indexOf(":") > 0) { return false; } return true; } public static Collection<String> getHostAddress() { if (!cached_host_addr.isEmpty()) { return Collections.unmodifiableCollection(cached_host_addr); } else { try { Enumeration e = NetworkInterface.getNetworkInterfaces(); while (e.hasMoreElements()) { NetworkInterface n = (NetworkInterface) e.nextElement(); Enumeration ee = n.getInetAddresses(); while (ee.hasMoreElements()) { InetAddress i = (InetAddress) ee.nextElement(); String hostAddress = i.getHostAddress(); if (isProperHostAddress(hostAddress)) { if (!cached_host_addr.contains(hostAddress)) { cached_host_addr.add(hostAddress); } } String hostName = i.getHostName(); if (isProperHostAddress(hostName)) { if (!cached_host_addr.contains(hostName)) { cached_host_addr.add(hostName); } } String canonicalHostName = i.getCanonicalHostName(); if (isProperHostAddress(canonicalHostName)) { if (!cached_host_addr.contains(canonicalHostName)) { cached_host_addr.add(canonicalHostName); } } } } } catch (SocketException ex) { LOG.error("Exception occurred while scanning local interfaces", ex); } return Collections.unmodifiableCollection(cached_host_addr); } } public static Collection<String> getIPAddress() { if (!cached_ip_addr.isEmpty()) { return Collections.unmodifiableCollection(cached_ip_addr); } else { try { Enumeration e = NetworkInterface.getNetworkInterfaces(); while (e.hasMoreElements()) { NetworkInterface n = (NetworkInterface) e.nextElement(); Enumeration ee = n.getInetAddresses(); while (ee.hasMoreElements()) { InetAddress i = (InetAddress) ee.nextElement(); if (!i.isLoopbackAddress()) { String hostAddress = i.getHostAddress(); cached_ip_addr.add(hostAddress); } } } } catch (SocketException ex) { LOG.error("Exception occurred while scanning local interfaces", ex); } return Collections.unmodifiableCollection(cached_ip_addr); } } public static String getPublicIPAddress() { if (cached_public_ip != null && !cached_public_ip.isEmpty()) { return cached_public_ip; } else { try { URL whatismyip = new URL("http://checkip.amazonaws.com"); BufferedReader in = null; try { in = new BufferedReader(new InputStreamReader(whatismyip.openStream())); String ip = in.readLine(); // cache cached_public_ip = ip; return ip; } catch (IOException ex) { LOG.error("Exception occurred while querying public ip address to amazonaws.com", ex); } finally { if (in != null) { try { in.close(); } catch (IOException e) { LOG.error("Exception occurred while querying public ip address to amazonaws.com", e); } } } } catch (MalformedURLException ex) { LOG.error("Exception occurred while querying public ip address to amazonaws.com", ex); } } return null; } public static boolean isIPAddress(String address) { Matcher matcher = IP_pattern.matcher(address); return matcher.matches(); } public static boolean isDomainName(String address) { Matcher matcher = Domain_pattern.matcher(address); return matcher.matches(); } public static boolean isPublicIPAddress(String address) { Matcher matcher = IP_pattern.matcher(address); if (matcher.matches()) { String first = matcher.group(1); String second = matcher.group(2); int f = Integer.parseInt(first); int s = Integer.parseInt(second); if (f == 192 && s == 168) { return false; } if (f == 172 && s >= 16 && s <= 31) { return false; } if (f == 10) { return false; } return true; } return false; } }