1 files changed, 99 insertions, 0 deletions
diff --git a/cadi/core/src/main/java/org/onap/ccsdk/apps/cadi/util/NetMask.java b/cadi/core/src/main/java/org/onap/ccsdk/apps/cadi/util/NetMask.java
new file mode 100644
index 00000000..3446e258
--- /dev/null
+++ b/cadi/core/src/main/java/org/onap/ccsdk/apps/cadi/util/NetMask.java
@@ -0,0 +1,99 @@
+/**
+ * ============LICENSE_START====================================================
+ * org.onap.ccsdk
+ * ===========================================================================
+ * Copyright (c) 2023 AT&T Intellectual Property. All rights reserved.
+ * ===========================================================================
+ * Licensed 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.
+ * ============LICENSE_END====================================================
+ *
+ */
+
+package org.onap.ccsdk.apps.cadi.util;
+
+/*
+ * NetMask - a class to quickly validate whether a given IP is part of a mask, as defined by bytes or standard String format.
+ *
+ * Needs the IPV6 Mask Builder.
+ */
+public class NetMask {
+    private long mask;
+
+    public NetMask(byte[] inBytes) {
+        mask = derive(inBytes);
+    }
+
+    public NetMask(String string) throws MaskFormatException {
+        mask = derive(string,true);
+    }
+
+    public boolean isInNet(byte[] inBytes) {
+        long addr = derive(inBytes);
+        return (mask & addr) == addr;
+    }
+
+    public boolean isInNet(String str) {
+        long addr;
+        try {
+            addr = derive(str,false);
+            return (mask & addr) == addr;
+        } catch (MaskFormatException e) {
+            // will not hit this code;
+            return false;
+        }
+    }
+
+    public static long derive(byte[] inBytes) {
+        long addr = 0L;
+        int offset = inBytes.length*8;
+        for (int i=0;i<inBytes.length;++i) {
+            addr&=(inBytes[i]<<offset);
+            offset-=8;
+        }
+        return addr;
+    }
+
+    public static long derive(String str, boolean check) throws MaskFormatException {
+        long rv=0L;
+        int idx=str.indexOf(':');
+        int slash = str.indexOf('/');
+
+        if (idx<0) { // Not IPV6, so it's IPV4... Is there a mask of 123/254?
+            idx=str.indexOf('.');
+            int offset = 24;
+            int end = slash>=0?slash:str.length();
+            int bits = slash>=0?Integer.parseInt(str.substring(slash+1)):32;
+            if (check && bits>32) {
+                throw new MaskFormatException("Invalid Mask Offset in IPV4 Address");
+            }
+            int prev = 0;
+            long lbyte;
+            while (prev<end) {
+                if (idx<0) {
+                    idx = end;
+                }
+                lbyte = Long.parseLong(str.substring(prev, idx));
+                if (check && (lbyte>255 || lbyte<0)) {
+                    throw new MaskFormatException("Invalid Byte in IPV4 Address");
+                }
+                rv|=lbyte<<offset;
+                prev = ++idx;
+                idx=str.indexOf('.',prev);
+                offset-=8;
+            }
+            rv|=0x00000000FFFFFFFFL>>bits;
+        }
+        return rv;
+    }
+
+}