1 /*******************************************************************************
2 * ============LICENSE_START==================================================
4 * * ===========================================================================
5 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
6 * * ===========================================================================
7 * * Licensed under the Apache License, Version 2.0 (the "License");
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22 ******************************************************************************/
25 package org.onap.dmaap.datarouter.node;
31 * Determine if an IP address is from a machine
34 private long nextcheck;
39 * Configure the JVM DNS cache to have a 10 second TTL. This needs to be called very very early or it won't have any effect.
41 public static void setDNSCache() {
42 java.security.Security.setProperty("networkaddress.cache.ttl", "10");
46 * Create an IsFrom for the specified fully qualified domain name.
48 public IsFrom(String fqdn) {
53 * Check if an IP address matches. If it has been more than
54 * 10 seconds since DNS was last checked for changes to the
55 * IP address(es) of this FQDN, check again. Then check
56 * if the specified IP address belongs to the FQDN.
58 public synchronized boolean isFrom(String ip) {
59 long now = System.currentTimeMillis();
60 if (now > nextcheck) {
61 nextcheck = now + 10000;
62 Vector<String> v = new Vector<String>();
64 InetAddress[] addrs = InetAddress.getAllByName(fqdn);
65 for (InetAddress a : addrs) {
66 v.add(a.getHostAddress());
68 } catch (Exception e) {
70 ips = v.toArray(new String[v.size()]);
72 for (String s : ips) {
81 * Return the fully qualified domain name
83 public String toString() {