Add SubnetAddressTranslator to translate Cassandra node IPs from private network based on its subnet mask #2013
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| /* | ||
| * 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.datastax.oss.driver.internal.core.addresstranslation; | ||
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| import com.datastax.oss.driver.shaded.guava.common.annotations.VisibleForTesting; | ||
| import com.datastax.oss.driver.shaded.guava.common.base.Splitter; | ||
| import java.net.InetAddress; | ||
| import java.net.UnknownHostException; | ||
| import java.util.Arrays; | ||
| import java.util.List; | ||
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| class Subnet { | ||
| private final byte[] subnet; | ||
| private final byte[] networkMask; | ||
| private final byte[] upper; | ||
| private final byte[] lower; | ||
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| private Subnet(byte[] subnet, byte[] networkMask) { | ||
| this.subnet = subnet; | ||
| this.networkMask = networkMask; | ||
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| byte[] upper = new byte[subnet.length]; | ||
| byte[] lower = new byte[subnet.length]; | ||
| for (int i = 0; i < subnet.length; i++) { | ||
| upper[i] = (byte) (subnet[i] | ~networkMask[i]); | ||
| lower[i] = (byte) (subnet[i] & networkMask[i]); | ||
| } | ||
| this.upper = upper; | ||
| this.lower = lower; | ||
| } | ||
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| static Subnet parse(String subnetCIDR) throws UnknownHostException { | ||
| List<String> parts = Splitter.on("/").splitToList(subnetCIDR); | ||
| if (parts.size() != 2) { | ||
| throw new IllegalArgumentException("Invalid subnet: " + subnetCIDR); | ||
| } | ||
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| boolean isIPv6 = parts.get(0).contains(":"); | ||
| byte[] subnet = InetAddress.getByName(parts.get(0)).getAddress(); | ||
| if (isIPv4(subnet) && isIPv6) { | ||
| subnet = toIPv6(subnet); | ||
| } | ||
| int prefixLength = Integer.parseInt(parts.get(1)); | ||
| validatePrefixLength(subnet, prefixLength); | ||
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| byte[] networkMask = toNetworkMask(subnet, prefixLength); | ||
| validateSubnetIsPrefixBlock(subnet, networkMask, subnetCIDR); | ||
| return new Subnet(subnet, networkMask); | ||
| } | ||
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| private static byte[] toNetworkMask(byte[] subnet, int prefixLength) { | ||
| int fullBytes = prefixLength / 8; | ||
| int remainingBits = prefixLength % 8; | ||
| byte[] mask = new byte[subnet.length]; | ||
| Arrays.fill(mask, 0, fullBytes, (byte) 0xFF); | ||
| if (remainingBits > 0) { | ||
| mask[fullBytes] = (byte) (0xFF << (8 - remainingBits)); | ||
| } | ||
| return mask; | ||
| } | ||
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| private static void validatePrefixLength(byte[] subnet, int prefixLength) { | ||
| int max_prefix_length = subnet.length * 8; | ||
| if (prefixLength < 0 || max_prefix_length < prefixLength) { | ||
| throw new IllegalArgumentException( | ||
| String.format( | ||
| "Prefix length %s must be within [0; %s]", prefixLength, max_prefix_length)); | ||
| } | ||
| } | ||
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| private static void validateSubnetIsPrefixBlock( | ||
| byte[] subnet, byte[] networkMask, String subnetCIDR) { | ||
| byte[] prefixBlock = toPrefixBlock(subnet, networkMask); | ||
| if (!Arrays.equals(subnet, prefixBlock)) { | ||
| throw new IllegalArgumentException( | ||
| String.format("Subnet %s must be represented as a network prefix block", subnetCIDR)); | ||
| } | ||
| } | ||
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| private static byte[] toPrefixBlock(byte[] subnet, byte[] networkMask) { | ||
| byte[] prefixBlock = new byte[subnet.length]; | ||
| for (int i = 0; i < subnet.length; i++) { | ||
| prefixBlock[i] = (byte) (subnet[i] & networkMask[i]); | ||
| } | ||
| return prefixBlock; | ||
| } | ||
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| @VisibleForTesting | ||
| byte[] getSubnet() { | ||
| return Arrays.copyOf(subnet, subnet.length); | ||
| } | ||
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| @VisibleForTesting | ||
| byte[] getNetworkMask() { | ||
| return Arrays.copyOf(networkMask, networkMask.length); | ||
| } | ||
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| byte[] getUpper() { | ||
| return Arrays.copyOf(upper, upper.length); | ||
| } | ||
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| byte[] getLower() { | ||
| return Arrays.copyOf(lower, lower.length); | ||
| } | ||
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| boolean isIPv4() { | ||
| return isIPv4(subnet); | ||
| } | ||
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| boolean isIPv6() { | ||
| return isIPv6(subnet); | ||
| } | ||
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| boolean contains(byte[] ip) { | ||
| if (isIPv4() && !isIPv4(ip)) { | ||
| return false; | ||
| } | ||
| if (isIPv6() && isIPv4(ip)) { | ||
| ip = toIPv6(ip); | ||
| } | ||
| if (subnet.length != ip.length) { | ||
| throw new IllegalArgumentException( | ||
| "IP version is unknown: " + Arrays.toString(toZeroBasedByteArray(ip))); | ||
| } | ||
| for (int i = 0; i < subnet.length; i++) { | ||
| if (subnet[i] != (byte) (ip[i] & networkMask[i])) { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
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| private static boolean isIPv4(byte[] ip) { | ||
| return ip.length == 4; | ||
| } | ||
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| private static boolean isIPv6(byte[] ip) { | ||
| return ip.length == 16; | ||
| } | ||
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| private static byte[] toIPv6(byte[] ipv4) { | ||
| byte[] ipv6 = new byte[16]; | ||
| ipv6[10] = (byte) 0xFF; | ||
| ipv6[11] = (byte) 0xFF; | ||
| System.arraycopy(ipv4, 0, ipv6, 12, 4); | ||
| return ipv6; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return Arrays.toString(toZeroBasedByteArray(subnet)); | ||
| } | ||
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| private static int[] toZeroBasedByteArray(byte[] bytes) { | ||
| int[] res = new int[bytes.length]; | ||
| for (int i = 0; i < bytes.length; i++) { | ||
| res[i] = bytes[i] & 0xFF; | ||
| } | ||
| return res; | ||
| } | ||
| } | ||
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