//
// 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;

import static org.hamcrest.Matchers.anyOf;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThanOrEqualTo;
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.hamcrest.Matchers.not;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

import java.math.BigInteger;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.stream.Collectors;

import org.junit.Assert;
import org.junit.Test;

import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.net.NetUtils.SupersetOrSubset;
import com.googlecode.ipv6.IPv6Address;
import com.googlecode.ipv6.IPv6Network;

import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;


@RunWith(PowerMockRunner.class)
@PowerMockIgnore({"jdk.xml.internal.*", "javax.xml.parsers.*", "org.xml.sax.*", "org.w3c.dom.*"})
public class NetUtilsTest {
    private static final String WIDE_SHARED_NET_CIDR_IP = "10.20.0.0";
    private static final List<String> WIDE_SHARED_NET_USED_IPS = List.of("10.20.0.22", "10.20.1.22", "10.20.2.22");

    @Test
    public void testGetRandomIpFromCidrWithSize24() throws Exception {
        final String cidr = "192.168.124.1";
        final int size = 24;
        final int netCharacters = 12;

        final long ip = NetUtils.getRandomIpFromCidr(cidr, size, new TreeSet<Long>());

        assertThat("The ip " + NetUtils.long2Ip(ip) + " retrieved must be within the cidr " + cidr + "/" + size, cidr.substring(0, netCharacters), equalTo(NetUtils.long2Ip(ip)
                .substring(0, netCharacters)));
    }

    @Test
    public void testGetRandomIpFromCidrWithSize16() throws Exception {
        final String cidr = "192.168.124.1";
        final int size = 16;
        final int netCharacters = 8;

        final long ip = NetUtils.getRandomIpFromCidr(cidr, 16, new TreeSet<Long>());

        assertThat("The ip " + NetUtils.long2Ip(ip) + " retrieved must be within the cidr " + cidr + "/" + size, cidr.substring(0, netCharacters), equalTo(NetUtils.long2Ip(ip)
                .substring(0, netCharacters)));
    }

    @Test
    public void testGetRandomIpFromCidrWithSize8() throws Exception {
        final String cidr = "192.168.124.1";
        final int size = 8;
        final int netCharacters = 4;

        final long ip = NetUtils.getRandomIpFromCidr(cidr, 16, new TreeSet<Long>());

        assertThat("The ip " + NetUtils.long2Ip(ip) + " retrieved must be within the cidr " + cidr + "/" + size, cidr.substring(0, netCharacters), equalTo(NetUtils.long2Ip(ip)
                .substring(0, netCharacters)));
    }

    @Test
    public void testGetRandomIpFromCidrUsignAvoid() throws Exception {
        final String cidr = "192.168.124.1";
        final int size = 30;

        final SortedSet<Long> avoid = new TreeSet<Long>();
        long ip = NetUtils.getRandomIpFromCidr(cidr, size, avoid);
        assertThat("We should be able to retrieve an ip on the first call.", ip, not(equalTo(-1L)));
        avoid.add(ip);
        ip = NetUtils.getRandomIpFromCidr(cidr, size, avoid);
        assertThat("We should be able to retrieve an ip on the second call.", ip, not(equalTo(-1L)));
        assertThat("ip returned is not in the avoid list", avoid, not(contains(ip)));
        avoid.add(ip);
        ip = NetUtils.getRandomIpFromCidr(cidr, size, avoid);
        assertThat("We should be able to retrieve an ip on the third call.", ip, not(equalTo(-1L)));
        assertThat("ip returned is not in the avoid list", avoid, not(contains(ip)));
        avoid.add(ip);
        ip = NetUtils.getRandomIpFromCidr(cidr, size, avoid);
        assertEquals("This should be -1 because we ran out of ip addresses: " + ip, ip, -1);
    }

    @Test
    public void testIsValidS2SVpnPolicy() {
        assertTrue(NetUtils.isValidS2SVpnPolicy("esp", "aes128-sha1"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("esp", "3des-sha1"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("esp", "3des-sha1,aes256-sha1"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("esp", "3des-md5;modp1024"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("esp", "3des-sha256,aes128-sha512;modp1536"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("ike", "3des-sha1;modp3072,aes128-sha1;modp1536"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("ike", "3des-md5;modp1024"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("ike", "3des-sha1;modp3072,aes128-sha1;modp1536"));
        assertTrue(NetUtils.isValidS2SVpnPolicy("ike", "3des-sha256;modp3072,aes128-sha512;modp1536"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("ike", "aes128-sha1"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("ike", "3des-sha1"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("ike", "3des-sha1,aes256-sha1"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("esp", "des-md5;modp1024,aes128-sha1;modp1536"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("esp", "des-sha1"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("esp", "abc-123,ase-sha1"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("esp", "de-sh,aes-sha1"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("esp", ""));
        assertFalse(NetUtils.isValidS2SVpnPolicy("esp", ";modp1536"));
        assertFalse(NetUtils.isValidS2SVpnPolicy("esp", ",aes;modp1536,,,"));
    }

    @Test
    public void testGetIp6FromRange() {
        assertEquals(NetUtils.getIp6FromRange("1234:5678::1-1234:5678::1"), "1234:5678::1");
        for (int i = 0; i < 5; i++) {
            final String ip = NetUtils.getIp6FromRange("1234:5678::1-1234:5678::2");
            assertThat(ip, anyOf(equalTo("1234:5678::1"), equalTo("1234:5678::2")));
        }
        String ipString = null;
        final IPv6Address ipStart = IPv6Address.fromString("1234:5678::1");
        final IPv6Address ipEnd = IPv6Address.fromString("1234:5678::ffff:ffff:ffff:ffff");
        for (int i = 0; i < 10; i++) {
            ipString = NetUtils.getIp6FromRange(ipStart.toString() + "-" + ipEnd.toString());
            final IPv6Address ip = IPv6Address.fromString(ipString);
            assertThat(ip, greaterThanOrEqualTo(ipStart));
            assertThat(ip, lessThanOrEqualTo(ipEnd));
        }
    }

    @Test
    public void testCountIp6InRange() {
        assertEquals(new BigInteger("2"), NetUtils.countIp6InRange("1234:5678::1-1234:5678::2"));
    }

    @Test
    public void testCountIp6InRangeWithInvalidRange() {
        assertEquals(null, NetUtils.countIp6InRange("1234:5678::2-1234:5678::0"));
    }

    @Test
    public void testCountIp6InRangeWithNullStart() {
        assertEquals(null, NetUtils.countIp6InRange("-1234:5678::0"));
    }

    @Test
    public void testCountIp6InRangeWithNoEnd() {
        assertEquals(new BigInteger("1"), NetUtils.countIp6InRange("1234:5678::2"));
    }

    @Test
    public void testGetIp6CidrSize() {
        assertEquals(NetUtils.getIp6CidrSize("1234:5678::1/32"), 32);
        assertEquals(NetUtils.getIp6CidrSize("1234:5678::1"), 0);
    }

    @Test
    public void testIsValidIp6Cidr() {
        assertTrue(NetUtils.isValidIp6Cidr("1234:5678::1/64"));
        assertFalse(NetUtils.isValidIp6Cidr("1234:5678::1"));
    }

    @Test
    public void testIsValidMacAddr() {
        assertTrue(NetUtils.isValidMac("ee:12:34:5:32:ff"));
        assertTrue(NetUtils.isValidMac("ee.12.34.5.32.ff"));
        assertTrue(NetUtils.isValidMac("ee-12-34-5-32-ff"));
        assertFalse(NetUtils.isValidMac("aa.12:34:5:32:ff"));
        assertFalse(NetUtils.isValidMac("gg.gg:gg:gg:gg:gg"));
    }

    @Test
    public void testIsUnicastMac() {

        assertTrue(NetUtils.isUnicastMac("ee:12:34:5:32:ff"));
        assertFalse(NetUtils.isUnicastMac("ff:12:34:5:32:ff"));
        assertFalse(NetUtils.isUnicastMac("01:12:34:5:32:ff"));
        assertTrue(NetUtils.isUnicastMac("00:ff:ff:ff:ff:ff"));
    }

    @Test
    public void testIsValidIpv6() {
        assertTrue(NetUtils.isValidIp6("fc00::1"));
        assertFalse(NetUtils.isValidIp6(""));
        assertFalse(NetUtils.isValidIp6(null));
        assertFalse(NetUtils.isValidIp6("1234:5678::1/64"));
    }

    @Test
    public void testIsIp6InRange() {
        assertTrue(NetUtils.isIp6InRange("1234:5678:abcd::1", "1234:5678:abcd::1-1234:5678:abcd::1"));
        assertFalse(NetUtils.isIp6InRange("1234:5678:abcd::1", "1234:5678:abcd::2-1234:5678:abcd::1"));
        assertFalse(NetUtils.isIp6InRange("1234:5678:abcd::1", null));
        assertTrue(NetUtils.isIp6InRange("1234:5678:abcd::1", "1234:5678::1-1234:5679::1"));
    }

    @Test
    public void testIsIp6InNetwork() {
        assertFalse(NetUtils.isIp6InNetwork(IPv6Address.fromString("1234:5678:abcd::1"), IPv6Network.fromString("1234:5678::/64")));
        assertTrue(NetUtils.isIp6InNetwork(IPv6Address.fromString("1234:5678::1"), IPv6Network.fromString("1234:5678::/64")));
        assertTrue(NetUtils.isIp6InNetwork(IPv6Address.fromString("1234:5678::ffff:ffff:ffff:ffff"), IPv6Network.fromString("1234:5678::/64")));
        assertTrue(NetUtils.isIp6InNetwork(IPv6Address.fromString("1234:5678::"), IPv6Network.fromString("1234:5678::/64")));
    }

    @Test
    public void testGetNextIp6InRange() {
        String range = "1234:5678::1-1234:5678::8000:0000";
        assertEquals(NetUtils.getNextIp6InRange("1234:5678::8000:0", range), "1234:5678::1");
        assertEquals(NetUtils.getNextIp6InRange("1234:5678::7fff:ffff", range), "1234:5678::8000:0");
        assertEquals(NetUtils.getNextIp6InRange("1234:5678::1", range), "1234:5678::2");
        range = "1234:5678::1-1234:5678::ffff:ffff:ffff:ffff";
        assertEquals(NetUtils.getNextIp6InRange("1234:5678::ffff:ffff:ffff:ffff", range), "1234:5678::1");
    }

    @Test
    public void testIsIp6RangeOverlap() {
        assertFalse(NetUtils.isIp6RangeOverlap("1234:5678::1-1234:5678::ffff", "1234:5678:1::1-1234:5678:1::ffff"));
        assertTrue(NetUtils.isIp6RangeOverlap("1234:5678::1-1234:5678::ffff", "1234:5678::2-1234:5678::f"));
        assertTrue(NetUtils.isIp6RangeOverlap("1234:5678::f-1234:5678::ffff", "1234:5678::2-1234:5678::f"));
        assertFalse(NetUtils.isIp6RangeOverlap("1234:5678::f-1234:5678::ffff", "1234:5678::2-1234:5678::e"));
        assertFalse(NetUtils.isIp6RangeOverlap("1234:5678::f-1234:5678::f", "1234:5678::2-1234:5678::e"));
    }

    @Test
    public void testStandardizeIp6Address() {
        assertEquals(NetUtils.standardizeIp6Address("1234:0000:0000:5678:0000:0000:ABCD:0001"), "1234::5678:0:0:abcd:1");
        assertEquals(NetUtils.standardizeIp6Cidr("1234:0000:0000:5678:0000:0000:ABCD:0001/64"), "1234:0:0:5678::/64");
    }

    @Test
    public void testGenerateUriForIsolatedPvlan() {
        assertEquals("pvlan://123-i456", NetUtils.generateUriForPvlan("123", "456").toString());
    }

    @Test
    public void testGenerateUriForCommunityPvlan() {
        assertEquals("pvlan://123-c456", NetUtils.generateUriForPvlan("123", "456", "Community").toString());
    }

    @Test
    public void testGenerateUriForPromiscuousPvlan() {
        assertEquals("pvlan://123-p123", NetUtils.generateUriForPvlan("123", "123", "promiscuous").toString());
    }

    @Test
    public void testGetPrimaryPvlanFromUri() {
        assertEquals("123", NetUtils.getPrimaryPvlanFromUri(NetUtils.generateUriForPvlan("123", "456")));
    }

    @Test
    public void testGetIsolatedPvlanFromUri() {
        assertEquals("456", NetUtils.getIsolatedPvlanFromUri(NetUtils.generateUriForPvlan("123", "456")));
    }

    @Test
    public void testIsValidCIDR() throws Exception {
        //Test to check IP Range of 2 CIDR
        final String cidrFirst = "10.0.144.0/20";
        final String cidrSecond = "10.0.151.0/20";
        final String cidrThird = "10.0.144.0/21";

        assertTrue(NetUtils.isValidIp4Cidr(cidrFirst));
        assertTrue(NetUtils.isValidIp4Cidr(cidrSecond));
        assertTrue(NetUtils.isValidIp4Cidr(cidrThird));;
    }

    @Test
    public void testIsValidCidrList() throws Exception {
        final String cidrFirst = "10.0.144.0/20,1.2.3.4/32,5.6.7.8/24";
        final String cidrSecond = "10.0.151.0/20,129.0.0.0/4";
        final String cidrThird = "10.0.144.0/21";

        assertTrue(NetUtils.isValidCidrList(cidrFirst));
        assertTrue(NetUtils.isValidCidrList(cidrSecond));
        assertTrue(NetUtils.isValidCidrList(cidrThird));
    }

    @Test
    public void testIsSameIpRange() {
        final String cidrFirst = "10.0.144.0/20";
        final String cidrSecond = "10.0.151.0/20";
        final String cidrThird = "10.0.144.0/21";

        //Check for exactly same CIDRs
        assertTrue(NetUtils.isSameIpRange(cidrFirst, cidrFirst));
        //Check for 2 different CIDRs, but same IP Range
        assertTrue(NetUtils.isSameIpRange(cidrFirst, cidrSecond));
        //Check for 2 different CIDRs and different IP Range
        assertFalse(NetUtils.isSameIpRange(cidrFirst, cidrThird));
        //Check for Incorrect format of CIDR
        assertFalse(NetUtils.isSameIpRange(cidrFirst, "10.3.6.5/50"));
    }

    @Test
    public void testGenerateMacOnIncrease() {
        String mac = "06:01:23:00:45:67";
        assertEquals("06:01:25:00:45:67", NetUtils.generateMacOnIncrease(mac, 2));
        assertEquals("06:01:33:00:45:67", NetUtils.generateMacOnIncrease(mac, 16));
        mac = "06:ff:ff:00:45:67";
        assertEquals("06:00:00:00:45:67", NetUtils.generateMacOnIncrease(mac, 1));
        assertEquals("06:00:0f:00:45:67", NetUtils.generateMacOnIncrease(mac, 16));
    }

    @Test
    public void testGetLocalIPString() {
        assertNotNull(NetUtils.getLocalIPString());
    }

    @Test
    public void testSameIsolationId() {
        assertTrue(NetUtils.isSameIsolationId("1", "vlan://1"));
        assertTrue(NetUtils.isSameIsolationId("", null));
        assertTrue(NetUtils.isSameIsolationId("UnTagged", "vlan://uNtAGGED"));
        assertFalse(NetUtils.isSameIsolationId("2", "vlan://uNtAGGED"));
        assertFalse(NetUtils.isSameIsolationId("2", "vlan://3"));
        assertFalse(NetUtils.isSameIsolationId("bla", null));
    }

    @Test
    public void testValidateGuestCidr() throws Exception {
        final String[] validCidrs = {"10.1.1.1/16", "172.16.1.0/16", "192.168.1.0/24", "100.64.1.0/24"};
        final String[] invalidCidrs = {"172.33.1.0/16", "100.128.1.0/10"};

        for (String cidr: validCidrs) {
            assertTrue(NetUtils.validateGuestCidr(cidr));
        }
        for (String cidr: invalidCidrs) {
            assertFalse(NetUtils.validateGuestCidr(cidr));
        }
    }

    @Test
    public void testMac2Long() {
        assertEquals(0l, NetUtils.mac2Long("00:00:00:00:00:00"));
        assertEquals(1l, NetUtils.mac2Long("00:00:00:00:00:01"));
        assertEquals(0xFFl, NetUtils.mac2Long("00:00:00:00:00:FF"));
        assertEquals(0xFFAAl, NetUtils.mac2Long("00:00:00:00:FF:AA"));
        assertEquals(0x11FFAAl, NetUtils.mac2Long("00:00:00:11:FF:AA"));
        assertEquals(0x12345678l, NetUtils.mac2Long("00:00:12:34:56:78"));
        assertEquals(0x123456789Al, NetUtils.mac2Long("00:12:34:56:78:9A"));
        assertEquals(0x123456789ABCl, NetUtils.mac2Long("12:34:56:78:9A:BC"));
    }

    @Test
    public void testLong2Mac() {
        assertEquals("00:00:00:00:00:00", NetUtils.long2Mac(0l));
        assertEquals("00:00:00:00:00:01", NetUtils.long2Mac(1l));
        assertEquals("00:00:00:00:00:ff", NetUtils.long2Mac(0xFFl));
        assertEquals("00:00:00:00:ff:aa", NetUtils.long2Mac(0xFFAAl));
        assertEquals("00:00:00:11:ff:aa", NetUtils.long2Mac(0x11FFAAl));
        assertEquals("00:00:12:34:56:78", NetUtils.long2Mac(0x12345678l));
        assertEquals("00:12:34:56:78:9a", NetUtils.long2Mac(0x123456789Al));
        assertEquals("12:34:56:78:9a:bc", NetUtils.long2Mac(0x123456789ABCl));
    }

    @Test
    public void testIp2Long() {
        assertEquals(0x7f000001l, NetUtils.ip2Long("127.0.0.1"));
        assertEquals(0xc0a80001l, NetUtils.ip2Long("192.168.0.1"));
        assertEquals(0x08080808l, NetUtils.ip2Long("8.8.8.8"));
    }

    @Test
    public void testLong2Ip() {
        assertEquals("127.0.0.1", NetUtils.long2Ip(0x7f000001l));
        assertEquals("192.168.0.1", NetUtils.long2Ip(0xc0a80001l));
        assertEquals("8.8.8.8", NetUtils.long2Ip(0x08080808l));
    }

    @Test
    public void test31BitPrefixStart() {
        final String ipAddress = "192.168.0.0";
        final String cidr = "192.168.0.0/31";

        final boolean isInRange = NetUtils.isIpWithInCidrRange(ipAddress, cidr);

        assertTrue("Check if the subnetUtils.setInclusiveHostCount(true) has been called.", isInRange);
    }

    @Test
    public void test31BitPrefixEnd() {
        final String ipAddress = "192.168.0.1";
        final String cidr = "192.168.0.0/31";

        final boolean isInRange = NetUtils.isIpWithInCidrRange(ipAddress, cidr);

        assertTrue("Check if the subnetUtils.setInclusiveHostCount(true) has been called.", isInRange);
    }

    @Test
    public void test31BitPrefixFail() {
        final String ipAddress = "192.168.0.2";
        final String cidr = "192.168.0.0/31";

        final boolean isInRange = NetUtils.isIpWithInCidrRange(ipAddress, cidr);

        assertFalse("Out of the range. Why did it return true?", isInRange);
    }

    @Test
    public void test31BitPrefixIpRangesOverlapd() {
        final String gw = "192.168.0.0";
        String ip1;
        String ip2;

        for (int i = 1, j = 2; i <= 254; i++, j++) {
            ip1 = "192.168.0." + i;
            ip2 = "192.168.0." + j;

            final boolean doesOverlap = NetUtils.ipRangesOverlap(ip1, ip2, gw, gw);
            assertFalse("It should overlap, but it's a 31-bit ip", doesOverlap);
        }
    }

    @Test
    public void test31BitPrefixIpRangesOverlapdFail() {
        String gw;
        String ip1;
        String ip2;

        for (int i = 10, j = 12; i <= 254; i++, j++) {
            gw = "192.168.0." + i;
            ip1 = "192.168.0." + i;
            ip2 = "192.168.0." + j;

            final boolean doesOverlap = NetUtils.ipRangesOverlap(ip1, ip2, gw, gw);
            assertTrue("It overlaps!", doesOverlap);
        }
    }

    @Test
    public void testIs31PrefixCidrFail() {
        final String cidr = "10.10.0.0/32";
        final boolean is31PrefixCidr = NetUtils.is31PrefixCidr(cidr);

        assertFalse("It should fail! 32 bit prefix.", is31PrefixCidr);
    }

    @Test
    public void testIs31PrefixCidr() {
        final String cidr = "10.10.0.0/31";
        final boolean is31PrefixCidr = NetUtils.is31PrefixCidr(cidr);

        assertTrue("It should pass! 31 bit prefix.", is31PrefixCidr);
    }

    @Test
    public void testGetCidrNetMask() {
        final String cidr = "10.10.0.0/16";
        String netmask = NetUtils.getCidrNetmask("10.10.10.10/16");
        assertTrue(cidr + " does not generate valid netmask " + netmask,NetUtils.isValidIp4Netmask(netmask));
    }

    @Test
    public void testGetCidrSubNet() {
        final String cidr = "10.10.0.0/16";
        String subnet = NetUtils.getCidrSubNet("10.10.10.10/16");
        assertTrue(cidr + " does not contain " + subnet,NetUtils.isIpWithInCidrRange(subnet, cidr));
    }

    @Test
    public void testGetCidrSubNetWithWidth() {
        final String cidr = "10.10.0.0/16";
        String subnet = NetUtils.getCidrSubNet("10.10.10.10", 16);
        assertTrue(cidr + " does not contain " + subnet,NetUtils.isIpWithInCidrRange(subnet, cidr));
    }

    @Test
    public void testIsValidCidrSize() {
        final String cidrsize = "16";
        long netbits = NetUtils.getCidrSizeFromString(cidrsize);
        assertTrue(" does not compute " + cidrsize,netbits == 16);
    }

    @Test(expected=CloudRuntimeException.class)
    public void testIsInvalidCidrSize() {
        final String cidrsize = "33";
        long netbits = NetUtils.getCidrSizeFromString(cidrsize);
        assertTrue(" does not compute " + cidrsize,netbits == 16);
    }

    @Test(expected=CloudRuntimeException.class)
    public void testIsInvalidCidrString() {
        final String cidrsize = "ggg";
        long netbits = NetUtils.getCidrSizeFromString(cidrsize);
        assertTrue(" does not compute " + cidrsize,netbits == 16);
    }

    @Test
    public void testCidrToLongArray() {
        final String cidr = "10.192.10.10/10";
        Long[] netbits = NetUtils.cidrToLong(cidr);
        assertEquals("unexpected cidrsize " + netbits[1],10l, netbits[1].longValue());
        assertEquals("(un)expected <" + 0x0ac00000L + "> netaddress " + netbits[0].longValue(),netbits[0].longValue(),0x0ac00000l);
    }

    @Test
    public void testNetmaskFromCidr() {
        long mask = NetUtils.netMaskFromCidr(1l);
        assertEquals("mask not right: " + mask, 0x80000000, mask);
        mask = NetUtils.netMaskFromCidr(32l);
        assertEquals("mask not right: " + mask, 0xffffffff, mask);
    }

    @Test
    public void testIsCidrsNotEmptyWithNullCidrs() {
        assertEquals(false, NetUtils.areCidrsNotEmpty(null, null));
    }

    @Test
    public void testIsCidrsNotEmptyWithEmptyCidrs() {
        assertEquals(false, NetUtils.areCidrsNotEmpty("", "  "));
    }

    @Test
    public void testIsCidrsNotEmpty() {
        assertEquals(true, NetUtils.areCidrsNotEmpty("10.10.0.0/16", "10.1.2.3/16"));
    }

    @Test
    public void testIsNetowrkASubsetOrSupersetOfNetworkBWithEmptyValues() {
        assertEquals(SupersetOrSubset.errorInCidrFormat, NetUtils.isNetowrkASubsetOrSupersetOfNetworkB("", null));
    }

    @Test
    public void testIsNetworkAWithinNetworkBWithEmptyValues() {
        assertEquals(false, NetUtils.isNetworkAWithinNetworkB("", null));
    }

    @Test
    public void testIsNetworkAWithinNetworkB() {
        assertTrue(NetUtils.isNetworkAWithinNetworkB("192.168.30.0/24", "192.168.30.0/23"));
        assertTrue(NetUtils.isNetworkAWithinNetworkB("192.168.30.0/24", "192.168.30.0/22"));
        assertFalse(NetUtils.isNetworkAWithinNetworkB("192.168.30.0/23", "192.168.30.0/24"));
        assertFalse(NetUtils.isNetworkAWithinNetworkB("192.168.30.0/22", "192.168.30.0/24"));
        assertTrue(NetUtils.isNetworkAWithinNetworkB("192.168.28.0/24", "192.168.28.0/23"));
        assertTrue(NetUtils.isNetworkAWithinNetworkB("192.168.28.0/24", "192.168.28.0/22"));
        assertFalse(NetUtils.isNetworkAWithinNetworkB("192.168.28.0/23", "192.168.28.0/24"));
        assertFalse(NetUtils.isNetworkAWithinNetworkB("192.168.28.0/22", "192.168.28.0/24"));
        assertTrue(NetUtils.isNetworkAWithinNetworkB("192.168.30.0/24", "192.168.28.0/22"));
    }

    @Test
    public void testIsNetworksOverlapWithEmptyValues() {
        assertEquals(false, NetUtils.isNetworksOverlap("", null));
    }
    @Test
    public void testisNetworkorBroadCastIP(){
         //Checking the True conditions
        assertTrue(NetUtils.isNetworkorBroadcastIP("192.168.0.0","255.255.255.0"));
        assertTrue(NetUtils.isNetworkorBroadcastIP("192.168.0.255","255.255.255.0"));
        assertTrue(NetUtils.isNetworkorBroadcastIP("192.168.0.127","255.255.255.128"));
        assertTrue(NetUtils.isNetworkorBroadcastIP("192.168.0.63","255.255.255.192"));

        //Checking the False conditions
        assertFalse(NetUtils.isNetworkorBroadcastIP("192.168.0.1","255.255.255.0"));
        assertFalse(NetUtils.isNetworkorBroadcastIP("192.168.0.127","255.255.255.0"));
        assertFalse(NetUtils.isNetworkorBroadcastIP("192.168.0.126","255.255.255.128"));
        assertFalse(NetUtils.isNetworkorBroadcastIP("192.168.0.62","255.255.255.192"));

        assertTrue(NetUtils.isNetworkorBroadcastIP("192.168.0.63","255.255.255.192"));
        assertFalse(NetUtils.isNetworkorBroadcastIP("192.168.0.63","255.255.255.128"));
    }

    @Test
    public void testIPv6EUI64Address() {
        assertEquals(IPv6Address.fromString("2001:db8:100::47a:88ff:fe00:8b"),
                NetUtils.EUI64Address("2001:db8:100::/64", "06:7a:88:00:00:8b"));

        assertEquals(IPv6Address.fromString("2a00:f10:121:b00:434:a0ff:fe00:1bc7"),
                NetUtils.EUI64Address("2a00:f10:121:b00::/64", "06:34:a0:00:1b:c7"));

        assertEquals(IPv6Address.fromString("2001:980:7936:0:ea2a:eaff:fe58:eb98"),
                NetUtils.EUI64Address("2001:980:7936::/64", "e8:2a:ea:58:eb:98"));

        assertEquals(IPv6Address.fromString("2001:980:7936:0:c23f:d5ff:fe68:2808"),
                NetUtils.EUI64Address("2001:980:7936::/64", "c0:3f:d5:68:28:08"));
    }

    @Test
    public void testcreateSequenceBasedMacAddress(){
        long mac1 = NetUtils.createSequenceBasedMacAddress(10l,10l);
        assertEquals(10l,(mac1 & (0x0al<<32)) >> 32);
        assertEquals(10l,mac1 & 0x0al);
        assertEquals(30l, mac1>>40);

        long mac2 = NetUtils.createSequenceBasedMacAddress(20l,15l);
        assertEquals(15l, (mac2 & (0x0fl << 32)) >> 32);
        assertEquals(20l, mac2 & 0x14l);
        assertEquals(30l, mac1>>40);
    }

    @Test
    public void testIPv6LinkLocal() {
        assertEquals(IPv6Address.fromString("fe80::fc54:ff:fe00:3e05"), NetUtils.ipv6LinkLocal("fe:54:00:00:3e:05"));
        assertEquals(IPv6Address.fromString("fe80::42:e0ff:fee8:d6a3"), NetUtils.ipv6LinkLocal("02:42:e0:e8:d6:a3"));
        assertEquals(IPv6Address.fromString("fe80::47a:88ff:fe00:8b"), NetUtils.ipv6LinkLocal("06:7a:88:00:00:8b"));
    }

    @Test
    public void testIsIpInCidrList() throws UnknownHostException {
        String[] cidrs = "0.0.0.0/0,::/0".split(",");
        System.out.println(NetUtils.isIpInCidrList(InetAddress.getByName("192.168.1.1"), cidrs));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("192.168.1.1"), cidrs));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("172.16.8.9"), cidrs));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("127.0.0.1"), cidrs));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("2001:db8:100::1"), cidrs));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("::1"), cidrs));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("2a01:4f8:130:2192::2"), cidrs));

        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("127.0.0.1"), "127.0.0.1/8".split(",")));
        assertFalse(NetUtils.isIpInCidrList(InetAddress.getByName("192.168.1.1"), "127.0.0.1/8".split(",")));

        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("127.0.0.1"), "127.0.0.1/8,::1/128".split(",")));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("::1"), "127.0.0.1/8,::1/128".split(",")));

        assertFalse(NetUtils.isIpInCidrList(InetAddress.getByName("192.168.29.47"), "127.0.0.1/8,::1/128".split(",")));
        assertFalse(NetUtils.isIpInCidrList(InetAddress.getByName("2001:db8:1938:3ff1::1"), "127.0.0.1/8,::1/128".split(",")));

        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("2a01:4f8:130:2192::2"), "::/0,127.0.0.1".split(",")));
        assertTrue(NetUtils.isIpInCidrList(InetAddress.getByName("2001:db8:200:300::1"), "2001:db8:200::/48,127.0.0.1".split(",")));
        assertFalse(NetUtils.isIpInCidrList(InetAddress.getByName("2001:db8:200:300::1"), "2001:db8:300::/64,127.0.0.1".split(",")));
        assertFalse(NetUtils.isIpInCidrList(InetAddress.getByName("2a01:4f8:130:2192::2"), "2001:db8::/64,127.0.0.1".split(",")));
    }

    @Test
    public void testIsSiteLocalAddress() {
        assertTrue(NetUtils.isSiteLocalAddress("192.168.0.1"));
        assertTrue(NetUtils.isSiteLocalAddress("10.0.0.1"));
        assertTrue(NetUtils.isSiteLocalAddress("172.16.0.1"));
        assertTrue(NetUtils.isSiteLocalAddress("192.168.254.56"));
        assertTrue(NetUtils.isSiteLocalAddress("10.254.254.254"));
        assertFalse(NetUtils.isSiteLocalAddress("8.8.8.8"));
        assertFalse(NetUtils.isSiteLocalAddress("8.8.4.4"));
        assertFalse(NetUtils.isSiteLocalAddress(""));
        assertFalse(NetUtils.isSiteLocalAddress(null));
    }

    @Test
    public void testStaticVariables() {
        assertEquals(80, NetUtils.HTTP_PORT);
        assertEquals(443, NetUtils.HTTPS_PORT);
        assertEquals(500, NetUtils.VPN_PORT);
        assertEquals(4500, NetUtils.VPN_NATT_PORT);
        assertEquals(1701, NetUtils.VPN_L2TP_PORT);
        assertEquals(8081, NetUtils.HAPROXY_STATS_PORT);

        assertEquals("udp", NetUtils.UDP_PROTO);
        assertEquals("tcp", NetUtils.TCP_PROTO);
        assertEquals("any", NetUtils.ANY_PROTO);
        assertEquals("icmp", NetUtils.ICMP_PROTO);
        assertEquals("http", NetUtils.HTTP_PROTO);
        assertEquals("ssl", NetUtils.SSL_PROTO);

        assertEquals("0.0.0.0/0", NetUtils.ALL_IP4_CIDRS);
        assertEquals("::/0", NetUtils.ALL_IP6_CIDRS);
    }

    @Test
    public void testIsValidPort() {
        assertTrue(NetUtils.isValidPort(80));
        assertTrue(NetUtils.isValidPort("80"));
        assertTrue(NetUtils.isValidPort(443));
        assertTrue(NetUtils.isValidPort("443"));
        assertTrue(NetUtils.isValidPort(0));
        assertTrue(NetUtils.isValidPort(65535));
        assertFalse(NetUtils.isValidPort(-1));
        assertFalse(NetUtils.isValidPort(65536));
    }

    @Test
    public void testIsIpv4() {
        assertTrue(NetUtils.isIpv4("192.168.1.1"));
        assertFalse(NetUtils.isIpv4("2a01:4f8:130:2192::2"));
    }

    @Test(expected = IllegalArgumentException.class)
    public void testIsIpv4ExpectException() {
        NetUtils.isIpv4("test");
    }

    @Test(expected = IllegalArgumentException.class)
    public void testIsIpv4ExpectException2() {
        NetUtils.isIpv4("2001:db8:300::/64");
    }

    public void testAllIpsOfDefaultNic() {
        final String defaultHostIp = NetUtils.getDefaultHostIp();
        if (defaultHostIp != null) {
            assertTrue(NetUtils.getAllDefaultNicIps().stream().anyMatch(defaultHostIp::contains));
        }
    }

    @Test
    public void testIsIPv6EUI64() {
        assertTrue(NetUtils.isIPv6EUI64("fe80::5054:8fff:fe9f:af61"));
        assertTrue(NetUtils.isIPv6EUI64("2a00:f10:305:0:464:64ff:fe00:4e0"));
        assertFalse(NetUtils.isIPv6EUI64("2001:db8::100:1"));
        assertFalse(NetUtils.isIPv6EUI64("2a01:4f9:2a:185f::2"));
    }

    @Test
    public void testLinkLocal() {
        final String cidr = NetUtils.getLinkLocalCIDR();
        assertEquals("255.255.0.0", NetUtils.getLinkLocalNetMask());
        assertEquals("169.254.0.1", NetUtils.getLinkLocalGateway());
        assertEquals("169.254.0.0/16", cidr);
        assertEquals("169.254.0.1", NetUtils.getLinkLocalFirstAddressFromCIDR(cidr));
        assertEquals("169.254.0.1/255.255.0.0", NetUtils.getLinkLocalAddressFromCIDR(cidr));
        assertEquals("169.254.240.1/255.255.240.0", NetUtils.getLinkLocalAddressFromCIDR("169.254.240.0/20"));

        String[] range = NetUtils.getLinkLocalIPRange("169.254.0.0/16");
        assertEquals("169.254.0.2", range[0]);
        assertEquals("169.254.255.254", range[1]);
    }

    @Test
    public void testCidrNetmask() {
        assertEquals("255.255.255.0", NetUtils.cidr2Netmask("192.168.0.0/24"));
        assertEquals("255.255.0.0", NetUtils.cidr2Netmask("169.254.0.0/16"));
        assertEquals("255.255.240.0", NetUtils.cidr2Netmask("169.254.240.0/20"));
    }

    private void runTestGetAllIpsFromCidr(int cidrSize, int maxIps, boolean usedIpPresent, int resultSize) {
        Set<Long> usedIps = new TreeSet<>();
        if (usedIpPresent) {
            for (String ip : WIDE_SHARED_NET_USED_IPS) {
                usedIps.add(NetUtils.ip2Long(ip));
            }
        }
        Set<Long> result = NetUtils.getAllIpsFromCidr(WIDE_SHARED_NET_CIDR_IP, cidrSize, usedIps, maxIps);
        assertNotNull(result);
        assertEquals(resultSize, result.size());
        if (usedIpPresent) {
            for (String ip : WIDE_SHARED_NET_USED_IPS) {
                assertFalse(result.contains(NetUtils.ip2Long(ip)));
            }
        }
    }

    @Test
    public void testGetAllIpsFromCidrNoneUsedNoLimit() {
        runTestGetAllIpsFromCidr(22, -1, false, 1022);
    }

    @Test
    public void testGetAllIpsFromCidrNoneUsedLimit() {
        runTestGetAllIpsFromCidr(22, 255, false, 255);
    }

    @Test
    public void testGetAllIpsFromCidrNoneUsedLessLimit() {
        runTestGetAllIpsFromCidr(22, 10, false, 10);
    }


    @Test
    public void testGetAllIpsFromCidrUsedNoLimit() {
        runTestGetAllIpsFromCidr(22, -1, true, 1022 - WIDE_SHARED_NET_USED_IPS.size());
    }

    @Test
    public void testGetAllIpsFromCidrUsedLimit() {
        runTestGetAllIpsFromCidr(22, 50, true, 50);
        List<String> usedIpsInRange = new ArrayList<>(WIDE_SHARED_NET_USED_IPS);
        usedIpsInRange = usedIpsInRange.stream().filter(x -> x.startsWith("10.20.0.")).collect(Collectors.toList());
        runTestGetAllIpsFromCidr(24, 255, true, 254 - usedIpsInRange.size());
    }

    @Test
    public void getNetworkInterfaceTestReturnNullWhenStringIsNull() {
        NetworkInterface result = NetUtils.getNetworkInterface(null);
        Assert.assertNull(result);
    }

    @Test
    public void getNetworkInterfaceTestReturnNullWhenStringIsEmpty() {
        NetworkInterface result = NetUtils.getNetworkInterface("     ");
        Assert.assertNull(result);
    }

    @Test
    @PrepareForTest(NetUtils.class)
    public void getNetworkInterfaceTestReturnNullWhenGetByNameReturnsNull() throws SocketException {
        PowerMockito.mockStatic(NetworkInterface.class);
        PowerMockito.when(NetworkInterface.getByName(Mockito.anyString())).thenReturn(null);
        NetworkInterface result = NetUtils.getNetworkInterface("  test   ");

        Assert.assertNull(result);
    }

    @Test
    @PrepareForTest(NetUtils.class)
    public void getNetworkInterfaceTestReturnNullWhenGetByNameThrowsException() throws SocketException {
        PowerMockito.mockStatic(NetworkInterface.class);
        PowerMockito.when(NetworkInterface.getByName(Mockito.anyString())).thenThrow(SocketException.class);
        NetworkInterface result = NetUtils.getNetworkInterface("  test   ");

        Assert.assertNull(result);
    }

    @Test
    @PrepareForTest(NetUtils.class)
    public void getNetworkInterfaceTestReturnInterfaceReturnedByGetByName() throws SocketException {
        NetworkInterface expected = PowerMockito.mock(NetworkInterface.class);
        PowerMockito.mockStatic(NetworkInterface.class);
        PowerMockito.when(NetworkInterface.getByName(Mockito.anyString())).thenReturn(expected);

        NetworkInterface result = NetUtils.getNetworkInterface("  test   ");

        Assert.assertEquals(expected, result);
    }
}
