Update project structure to org.onap

[dmaap/datarouter.git] / datarouter-node / src / main / java / org / onap / dmaap / datarouter / node / IsFrom.java

diff --git a/datarouter-node/src/main/java/org/onap/dmaap/datarouter/node/IsFrom.java b/datarouter-node/src/main/java/org/onap/dmaap/datarouter/node/IsFrom.java
new file mode 100644 (file)
index 0000000..36dbc23
--- /dev/null
+++ b/datarouter-node/src/main/java/org/onap/dmaap/datarouter/node/IsFrom.java
@@ -0,0 +1,82 @@
+/*******************************************************************************\r
+ * ============LICENSE_START==================================================\r
+ * * org.onap.dmaap\r
+ * * ===========================================================================\r
+ * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.\r
+ * * ===========================================================================\r
+ * * Licensed under the Apache License, Version 2.0 (the "License");\r
+ * * you may not use this file except in compliance with the License.\r
+ * * You may obtain a copy of the License at\r
+ * * \r
+ *  *      http://www.apache.org/licenses/LICENSE-2.0\r
+ * * \r
+ *  * Unless required by applicable law or agreed to in writing, software\r
+ * * distributed under the License is distributed on an "AS IS" BASIS,\r
+ * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ * * See the License for the specific language governing permissions and\r
+ * * limitations under the License.\r
+ * * ============LICENSE_END====================================================\r
+ * *\r
+ * * ECOMP is a trademark and service mark of AT&T Intellectual Property.\r
+ * *\r
+ ******************************************************************************/\r
+\r
+\r
+package org.onap.dmaap.datarouter.node;\r
+\r
+import java.util.*;\r
+import java.net.*;\r
+\r
+/**\r
+ *     Determine if an IP address is from a machine\r
+ */\r
+public class IsFrom    {\r
+       private long    nextcheck;\r
+       private String[] ips;\r
+       private String  fqdn;\r
+       /**\r
+        *      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.\r
+        */\r
+       public static void setDNSCache() {\r
+               java.security.Security.setProperty("networkaddress.cache.ttl", "10");\r
+       }\r
+       /**\r
+        *      Create an IsFrom for the specified fully qualified domain name.\r
+        */\r
+       public IsFrom(String fqdn) {\r
+               this.fqdn = fqdn;\r
+       }\r
+       /**\r
+        *      Check if an IP address matches.  If it has been more than\r
+        *      10 seconds since DNS was last checked for changes to the\r
+        *      IP address(es) of this FQDN, check again.  Then check\r
+        *      if the specified IP address belongs to the FQDN.\r
+        */\r
+       public synchronized boolean isFrom(String ip) {\r
+               long now = System.currentTimeMillis();\r
+               if (now > nextcheck) {\r
+                       nextcheck = now + 10000;\r
+                       Vector<String> v = new Vector<String>();\r
+                       try {\r
+                               InetAddress[] addrs = InetAddress.getAllByName(fqdn);\r
+                               for (InetAddress a: addrs) {\r
+                                       v.add(a.getHostAddress());\r
+                               }\r
+                       } catch (Exception e) {\r
+                       }\r
+                       ips = v.toArray(new String[v.size()]);\r
+               }\r
+               for (String s: ips) {\r
+                       if (s.equals(ip)) {\r
+                               return(true);\r
+                       }\r
+               }\r
+               return(false);\r
+       }\r
+       /**\r
+        *      Return the fully qualified domain name\r
+        */\r
+       public String toString() {\r
+               return(fqdn);\r
+       }\r
+}\r