+/*******************************************************************************\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 com.att.research.datarouter.node;\r
+\r
+import java.net.*;\r
+\r
+/**\r
+ * Compare IP addresses as byte arrays to a subnet specified as a CIDR\r
+ */\r
+public class SubnetMatcher {\r
+ private byte[] sn;\r
+ private int len;\r
+ private int mask;\r
+ /**\r
+ * Construct a subnet matcher given a CIDR\r
+ * @param subnet The CIDR to match\r
+ */\r
+ public SubnetMatcher(String subnet) {\r
+ int i = subnet.lastIndexOf('/');\r
+ if (i == -1) {\r
+ sn = NodeUtils.getInetAddress(subnet);\r
+ len = sn.length;\r
+ } else {\r
+ len = Integer.parseInt(subnet.substring(i + 1));\r
+ sn = NodeUtils.getInetAddress(subnet.substring(0, i));\r
+ mask = ((0xff00) >> (len % 8)) & 0xff;\r
+ len /= 8;\r
+ }\r
+ }\r
+ /**\r
+ * Is the IP address in the CIDR?\r
+ * @param addr the IP address as bytes in network byte order\r
+ * @return true if the IP address matches.\r
+ */\r
+ public boolean matches(byte[] addr) {\r
+ if (addr.length != sn.length) {\r
+ return(false);\r
+ }\r
+ for (int i = 0; i < len; i++) {\r
+ if (addr[i] != sn[i]) {\r
+ return(false);\r
+ }\r
+ }\r
+ if (mask != 0 && ((addr[len] ^ sn[len]) & mask) != 0) {\r
+ return(false);\r
+ }\r
+ return(true);\r
+ }\r
+}\r