Github user jburwell commented on a diff in the pull request:
https://github.com/apache/cloudstack/pull/1371#discussion_r62787904
--- Diff: utils/src/main/java/com/cloud/utils/net/cidr/CIDR4.java ---
@@ -0,0 +1,172 @@
+//
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you 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.
+//
+
+package com.cloud.utils.net.cidr;
+
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+import org.apache.commons.lang.NotImplementedException;
+import org.apache.log4j.Logger;
+
+import com.cloud.utils.net.NetUtils;
+
+/**
+ */
+public class CIDR4 implements CIDR {
+ protected final static Logger s_logger = Logger.getLogger(CIDR4.class);
+
+ protected InetAddress baseAddress;
+ protected int cidrMask;
+ private int addressInt;
+ private final int addressEndInt;
+
+ protected CIDR4(Inet4Address newaddr, int mask) {
+ cidrMask = mask;
+ addressInt = ipv4AddressToInt(newaddr);
+ int newmask = ipv4PrefixLengthToMask(mask);
+ addressInt &= newmask;
+ try {
+ baseAddress = intToIPv4Address(addressInt);
+ } catch (UnknownHostException e) {
+ // this should never happen
+ }
+ addressEndInt = addressInt + ipv4PrefixLengthToLength(cidrMask) -
1;
+ }
+
+ public int compareTo(CIDR arg) {
+ if (arg instanceof CIDR6) {
+ throw new NotImplementedException("Not implemented for CIDR6");
+ }
+ CIDR4 o = (CIDR4)arg;
+ if (o.addressInt == addressInt && o.cidrMask == cidrMask) {
+ return 0;
+ }
+ if (o.addressInt < addressInt) {
+ return 1;
+ }
+ if (o.addressInt > addressInt) {
+ return -1;
+ }
+ if (o.cidrMask < cidrMask) {
+ // greater Mask means less IpAddresses so -1
+ return -1;
+ }
+ return 1;
+ }
+
+ @Override
+ public boolean isNull() {
+ return false;
+ }
+
+ @Override
+ public boolean contains(InetAddress inetAddress) {
+ if (inetAddress == null) {
+ throw new NullPointerException("inetAddress");
+ }
+
+ if (cidrMask == 0) {
+ return true;
+ }
+
+ int search = ipv4AddressToInt(inetAddress);
+ return search >= addressInt && search <= addressEndInt;
+ }
+
+ private static int ipv4PrefixLengthToLength(int prefixLength) {
+ return 1 << 32 - prefixLength;
+ }
+
+ private static int ipv4PrefixLengthToMask(int prefixLength) {
+ return ~((1 << 32 - prefixLength) - 1);
+ }
+
+ private static InetAddress intToIPv4Address(int addr) throws
UnknownHostException {
+ byte[] a = new byte[4];
+ a[0] = (byte)(addr >> 24 & 0xFF);
+ a[1] = (byte)(addr >> 16 & 0xFF);
+ a[2] = (byte)(addr >> 8 & 0xFF);
+ a[3] = (byte)(addr & 0xFF);
+ return InetAddress.getByAddress(a);
+ }
+
+ private static int ipv4AddressToInt(InetAddress addr) {
+ byte[] address;
+ if (addr instanceof Inet6Address) {
+ throw new NotImplementedException("Not implemented for ipv6
address");
+ } else {
+ address = addr.getAddress();
+ }
+ return ipv4AddressToInt(address);
+ }
+
+ private static int ipv4AddressToInt(byte[] address) {
+ int net = 0;
+ for (byte addres : address) {
+ net <<= 8;
+ net |= addres & 0xFF;
+ }
+ return net;
+ }
--- End diff --
Would it make sense to move the ``intToIPv4Address``,
``ipv4AddressToInit``, ``ipv4AddressToInt`` methods to the ``IpAddress``
interface?
Also, consider utilizing covarient types for the ``ipv4AddressToInt``
method -- allowing it to converted to ``int addressToInt(final Inet4Address
address)`` and ``int addressToInt(final Inet6Address address)``.
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