tests/net/common/java/android/net/IpPrefixTest.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * 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.
  */

 package android.net;

 import static com.android.testutils.MiscAssertsKt.assertEqualBothWays;
 import static com.android.testutils.MiscAssertsKt.assertFieldCountEquals;
 import static com.android.testutils.MiscAssertsKt.assertNotEqualEitherWay;
 import static com.android.testutils.ParcelUtilsKt.assertParcelingIsLossless;

 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;

 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;

 import org.junit.Test;
 import org.junit.runner.RunWith;

 import java.net.InetAddress;
 import java.util.Random;

 @RunWith(AndroidJUnit4.class)
 @SmallTest
 public class IpPrefixTest {

     private static InetAddress address(String addr) {
         return InetAddress.parseNumericAddress(addr);
     }

     // Explicitly cast everything to byte because "error: possible loss of precision".
     private static final byte[] IPV4_BYTES = { (byte) 192, (byte) 0, (byte) 2, (byte) 4};
     private static final byte[] IPV6_BYTES = {
         (byte) 0x20, (byte) 0x01, (byte) 0x0d, (byte) 0xb8,
         (byte) 0xde, (byte) 0xad, (byte) 0xbe, (byte) 0xef,
         (byte) 0x0f, (byte) 0x00, (byte) 0x00, (byte) 0x00,
         (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0xa0
     };

     @Test
     public void testConstructor() {
         IpPrefix p;
         try {
             p = new IpPrefix((byte[]) null, 9);
             fail("Expected NullPointerException: null byte array");
         } catch (RuntimeException expected) { }

         try {
             p = new IpPrefix((InetAddress) null, 10);
             fail("Expected NullPointerException: null InetAddress");
         } catch (RuntimeException expected) { }

         try {
             p = new IpPrefix((String) null);
             fail("Expected NullPointerException: null String");
         } catch (RuntimeException expected) { }


         try {
             byte[] b2 = {1, 2, 3, 4, 5};
             p = new IpPrefix(b2, 29);
             fail("Expected IllegalArgumentException: invalid array length");
         } catch (IllegalArgumentException expected) { }

         try {
             p = new IpPrefix("1.2.3.4");
             fail("Expected IllegalArgumentException: no prefix length");
         } catch (IllegalArgumentException expected) { }

         try {
             p = new IpPrefix("1.2.3.4/");
             fail("Expected IllegalArgumentException: empty prefix length");
         } catch (IllegalArgumentException expected) { }

         try {
             p = new IpPrefix("foo/32");
             fail("Expected IllegalArgumentException: invalid address");
         } catch (IllegalArgumentException expected) { }

         try {
             p = new IpPrefix("1/32");
             fail("Expected IllegalArgumentException: deprecated IPv4 format");
         } catch (IllegalArgumentException expected) { }

         try {
             p = new IpPrefix("1.2.3.256/32");
             fail("Expected IllegalArgumentException: invalid IPv4 address");
         } catch (IllegalArgumentException expected) { }

         try {
             p = new IpPrefix("foo/32");
             fail("Expected IllegalArgumentException: non-address");
         } catch (IllegalArgumentException expected) { }

         try {
             p = new IpPrefix("f00:::/32");
             fail("Expected IllegalArgumentException: invalid IPv6 address");
         } catch (IllegalArgumentException expected) { }
     }

     @Test
     public void testTruncation() {
         IpPrefix p;

         p = new IpPrefix(IPV4_BYTES, 32);
         assertEquals("192.0.2.4/32", p.toString());

         p = new IpPrefix(IPV4_BYTES, 29);
         assertEquals("192.0.2.0/29", p.toString());

         p = new IpPrefix(IPV4_BYTES, 8);
         assertEquals("192.0.0.0/8", p.toString());

         p = new IpPrefix(IPV4_BYTES, 0);
         assertEquals("0.0.0.0/0", p.toString());

         try {
             p = new IpPrefix(IPV4_BYTES, 33);
             fail("Expected IllegalArgumentException: invalid prefix length");
         } catch (RuntimeException expected) { }

         try {
             p = new IpPrefix(IPV4_BYTES, 128);
             fail("Expected IllegalArgumentException: invalid prefix length");
         } catch (RuntimeException expected) { }

         try {
             p = new IpPrefix(IPV4_BYTES, -1);
             fail("Expected IllegalArgumentException: negative prefix length");
         } catch (RuntimeException expected) { }

         p = new IpPrefix(IPV6_BYTES, 128);
         assertEquals("2001:db8:dead:beef:f00::a0/128", p.toString());

         p = new IpPrefix(IPV6_BYTES, 122);
         assertEquals("2001:db8:dead:beef:f00::80/122", p.toString());

         p = new IpPrefix(IPV6_BYTES, 64);
         assertEquals("2001:db8:dead:beef::/64", p.toString());

         p = new IpPrefix(IPV6_BYTES, 3);
         assertEquals("2000::/3", p.toString());

         p = new IpPrefix(IPV6_BYTES, 0);
         assertEquals("::/0", p.toString());

         try {
             p = new IpPrefix(IPV6_BYTES, -1);
             fail("Expected IllegalArgumentException: negative prefix length");
         } catch (RuntimeException expected) { }

         try {
             p = new IpPrefix(IPV6_BYTES, 129);
             fail("Expected IllegalArgumentException: negative prefix length");
         } catch (RuntimeException expected) { }

     }

     @Test
     public void testEquals() {
         IpPrefix p1, p2;

         p1 = new IpPrefix("192.0.2.251/23");
         p2 = new IpPrefix(new byte[]{(byte) 192, (byte) 0, (byte) 2, (byte) 251}, 23);
         assertEqualBothWays(p1, p2);

         p1 = new IpPrefix("192.0.2.5/23");
         assertEqualBothWays(p1, p2);

         p1 = new IpPrefix("192.0.2.5/24");
         assertNotEqualEitherWay(p1, p2);

         p1 = new IpPrefix("192.0.4.5/23");
         assertNotEqualEitherWay(p1, p2);


         p1 = new IpPrefix("2001:db8:dead:beef:f00::80/122");
         p2 = new IpPrefix(IPV6_BYTES, 122);
         assertEquals("2001:db8:dead:beef:f00::80/122", p2.toString());
         assertEqualBothWays(p1, p2);

         p1 = new IpPrefix("2001:db8:dead:beef:f00::bf/122");
         assertEqualBothWays(p1, p2);

         p1 = new IpPrefix("2001:db8:dead:beef:f00::8:0/123");
         assertNotEqualEitherWay(p1, p2);

         p1 = new IpPrefix("2001:db8:dead:beef::/122");
         assertNotEqualEitherWay(p1, p2);

         // 192.0.2.4/32 != c000:0204::/32.
         byte[] ipv6bytes = new byte[16];
         System.arraycopy(IPV4_BYTES, 0, ipv6bytes, 0, IPV4_BYTES.length);
         p1 = new IpPrefix(ipv6bytes, 32);
         assertEqualBothWays(p1, new IpPrefix("c000:0204::/32"));

         p2 = new IpPrefix(IPV4_BYTES, 32);
         assertNotEqualEitherWay(p1, p2);
     }

     @Test
     public void testContainsInetAddress() {
         IpPrefix p = new IpPrefix("2001:db8:f00::ace:d00d/127");
         assertTrue(p.contains(address("2001:db8:f00::ace:d00c")));
         assertTrue(p.contains(address("2001:db8:f00::ace:d00d")));
         assertFalse(p.contains(address("2001:db8:f00::ace:d00e")));
         assertFalse(p.contains(address("2001:db8:f00::bad:d00d")));
         assertFalse(p.contains(address("2001:4868:4860::8888")));
         assertFalse(p.contains(address("8.8.8.8")));

         p = new IpPrefix("192.0.2.0/23");
         assertTrue(p.contains(address("192.0.2.43")));
         assertTrue(p.contains(address("192.0.3.21")));
         assertFalse(p.contains(address("192.0.0.21")));
         assertFalse(p.contains(address("8.8.8.8")));
         assertFalse(p.contains(address("2001:4868:4860::8888")));

         IpPrefix ipv6Default = new IpPrefix("::/0");
         assertTrue(ipv6Default.contains(address("2001:db8::f00")));
         assertFalse(ipv6Default.contains(address("192.0.2.1")));

         IpPrefix ipv4Default = new IpPrefix("0.0.0.0/0");
         assertTrue(ipv4Default.contains(address("255.255.255.255")));
         assertTrue(ipv4Default.contains(address("192.0.2.1")));
         assertFalse(ipv4Default.contains(address("2001:db8::f00")));
     }

     @Test
     public void testContainsIpPrefix() {
         assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("0.0.0.0/0")));
         assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/0")));
         assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/8")));
         assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/24")));
         assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/23")));

         assertTrue(new IpPrefix("1.2.3.4/8").containsPrefix(new IpPrefix("1.2.3.4/8")));
         assertTrue(new IpPrefix("1.2.3.4/8").containsPrefix(new IpPrefix("1.254.12.9/8")));
         assertTrue(new IpPrefix("1.2.3.4/21").containsPrefix(new IpPrefix("1.2.3.4/21")));
         assertTrue(new IpPrefix("1.2.3.4/32").containsPrefix(new IpPrefix("1.2.3.4/32")));

         assertTrue(new IpPrefix("1.2.3.4/20").containsPrefix(new IpPrefix("1.2.3.0/24")));

         assertFalse(new IpPrefix("1.2.3.4/32").containsPrefix(new IpPrefix("1.2.3.5/32")));
         assertFalse(new IpPrefix("1.2.3.4/8").containsPrefix(new IpPrefix("2.2.3.4/8")));
         assertFalse(new IpPrefix("0.0.0.0/16").containsPrefix(new IpPrefix("0.0.0.0/15")));
         assertFalse(new IpPrefix("100.0.0.0/8").containsPrefix(new IpPrefix("99.0.0.0/8")));

         assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("::/0")));
         assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/1")));
         assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("3d8a:661:a0::770/8")));
         assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/8")));
         assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/64")));
         assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/113")));
         assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/128")));

         assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
                 new IpPrefix("2001:db8:f00::ace:d00d/64")));
         assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
                 new IpPrefix("2001:db8:f00::ace:d00d/120")));
         assertFalse(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
                 new IpPrefix("2001:db8:f00::ace:d00d/32")));
         assertFalse(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
                 new IpPrefix("2006:db8:f00::ace:d00d/96")));

         assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/128").containsPrefix(
                 new IpPrefix("2001:db8:f00::ace:d00d/128")));
         assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/100").containsPrefix(
                 new IpPrefix("2001:db8:f00::ace:ccaf/110")));

         assertFalse(new IpPrefix("2001:db8:f00::ace:d00d/128").containsPrefix(
                 new IpPrefix("2001:db8:f00::ace:d00e/128")));
         assertFalse(new IpPrefix("::/30").containsPrefix(new IpPrefix("::/29")));
     }

     @Test
     public void testHashCode() {
         IpPrefix p = new IpPrefix(new byte[4], 0);
         Random random = new Random();
         for (int i = 0; i < 100; i++) {
             final IpPrefix oldP = p;
             if (random.nextBoolean()) {
                 // IPv4.
                 byte[] b = new byte[4];
                 random.nextBytes(b);
                 p = new IpPrefix(b, random.nextInt(33));
             } else {
                 // IPv6.
                 byte[] b = new byte[16];
                 random.nextBytes(b);
                 p = new IpPrefix(b, random.nextInt(129));
             }
             if (p.equals(oldP)) {
                 assertEquals(p.hashCode(), oldP.hashCode());
             }
             if (p.hashCode() != oldP.hashCode()) {
                 assertNotEquals(p, oldP);
             }
         }
     }

     @Test
     public void testHashCodeIsNotConstant() {
         IpPrefix[] prefixes = {
             new IpPrefix("2001:db8:f00::ace:d00d/127"),
             new IpPrefix("192.0.2.0/23"),
             new IpPrefix("::/0"),
             new IpPrefix("0.0.0.0/0"),
         };
         for (int i = 0; i < prefixes.length; i++) {
             for (int j = i + 1; j < prefixes.length; j++) {
                 assertNotEquals(prefixes[i].hashCode(), prefixes[j].hashCode());
             }
         }
     }

     @Test
     public void testMappedAddressesAreBroken() {
         // 192.0.2.0/24 != ::ffff:c000:0204/120, but because we use InetAddress,
         // we are unable to comprehend that.
         byte[] ipv6bytes = {
             (byte) 0, (byte) 0, (byte) 0, (byte) 0,
             (byte) 0, (byte) 0, (byte) 0, (byte) 0,
             (byte) 0, (byte) 0, (byte) 0xff, (byte) 0xff,
             (byte) 192, (byte) 0, (byte) 2, (byte) 0};
         IpPrefix p = new IpPrefix(ipv6bytes, 120);
         assertEquals(16, p.getRawAddress().length);       // Fine.
         assertArrayEquals(ipv6bytes, p.getRawAddress());  // Fine.

         // Broken.
         assertEquals("192.0.2.0/120", p.toString());
         assertEquals(InetAddress.parseNumericAddress("192.0.2.0"), p.getAddress());
     }

     @Test
     public void testParceling() {
         IpPrefix p;

         p = new IpPrefix("2001:4860:db8::/64");
         assertParcelingIsLossless(p);
         assertTrue(p.isIPv6());

         p = new IpPrefix("192.0.2.0/25");
         assertParcelingIsLossless(p);
         assertTrue(p.isIPv4());

         assertFieldCountEquals(2, IpPrefix.class);
     }
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* 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.
	*/

	package android.net;

	import static com.android.testutils.MiscAssertsKt.assertEqualBothWays;
	import static com.android.testutils.MiscAssertsKt.assertFieldCountEquals;
	import static com.android.testutils.MiscAssertsKt.assertNotEqualEitherWay;
	import static com.android.testutils.ParcelUtilsKt.assertParcelingIsLossless;

	import static org.junit.Assert.assertArrayEquals;
	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertFalse;
	import static org.junit.Assert.assertNotEquals;
	import static org.junit.Assert.assertTrue;
	import static org.junit.Assert.fail;

	import androidx.test.filters.SmallTest;
	import androidx.test.runner.AndroidJUnit4;

	import org.junit.Test;
	import org.junit.runner.RunWith;

	import java.net.InetAddress;
	import java.util.Random;

	@RunWith(AndroidJUnit4.class)
	@SmallTest
	public class IpPrefixTest {

	private static InetAddress address(String addr) {
	return InetAddress.parseNumericAddress(addr);
	}

	// Explicitly cast everything to byte because "error: possible loss of precision".
	private static final byte[] IPV4_BYTES = { (byte) 192, (byte) 0, (byte) 2, (byte) 4};
	private static final byte[] IPV6_BYTES = {
	(byte) 0x20, (byte) 0x01, (byte) 0x0d, (byte) 0xb8,
	(byte) 0xde, (byte) 0xad, (byte) 0xbe, (byte) 0xef,
	(byte) 0x0f, (byte) 0x00, (byte) 0x00, (byte) 0x00,
	(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0xa0
	};

	@Test
	public void testConstructor() {
	IpPrefix p;
	try {
	p = new IpPrefix((byte[]) null, 9);
	fail("Expected NullPointerException: null byte array");
	} catch (RuntimeException expected) { }

	try {
	p = new IpPrefix((InetAddress) null, 10);
	fail("Expected NullPointerException: null InetAddress");
	} catch (RuntimeException expected) { }

	try {
	p = new IpPrefix((String) null);
	fail("Expected NullPointerException: null String");
	} catch (RuntimeException expected) { }


	try {
	byte[] b2 = {1, 2, 3, 4, 5};
	p = new IpPrefix(b2, 29);
	fail("Expected IllegalArgumentException: invalid array length");
	} catch (IllegalArgumentException expected) { }

	try {
	p = new IpPrefix("1.2.3.4");
	fail("Expected IllegalArgumentException: no prefix length");
	} catch (IllegalArgumentException expected) { }

	try {
	p = new IpPrefix("1.2.3.4/");
	fail("Expected IllegalArgumentException: empty prefix length");
	} catch (IllegalArgumentException expected) { }

	try {
	p = new IpPrefix("foo/32");
	fail("Expected IllegalArgumentException: invalid address");
	} catch (IllegalArgumentException expected) { }

	try {
	p = new IpPrefix("1/32");
	fail("Expected IllegalArgumentException: deprecated IPv4 format");
	} catch (IllegalArgumentException expected) { }

	try {
	p = new IpPrefix("1.2.3.256/32");
	fail("Expected IllegalArgumentException: invalid IPv4 address");
	} catch (IllegalArgumentException expected) { }

	try {
	p = new IpPrefix("foo/32");
	fail("Expected IllegalArgumentException: non-address");
	} catch (IllegalArgumentException expected) { }

	try {
	p = new IpPrefix("f00:::/32");
	fail("Expected IllegalArgumentException: invalid IPv6 address");
	} catch (IllegalArgumentException expected) { }
	}

	@Test
	public void testTruncation() {
	IpPrefix p;

	p = new IpPrefix(IPV4_BYTES, 32);
	assertEquals("192.0.2.4/32", p.toString());

	p = new IpPrefix(IPV4_BYTES, 29);
	assertEquals("192.0.2.0/29", p.toString());

	p = new IpPrefix(IPV4_BYTES, 8);
	assertEquals("192.0.0.0/8", p.toString());

	p = new IpPrefix(IPV4_BYTES, 0);
	assertEquals("0.0.0.0/0", p.toString());

	try {
	p = new IpPrefix(IPV4_BYTES, 33);
	fail("Expected IllegalArgumentException: invalid prefix length");
	} catch (RuntimeException expected) { }

	try {
	p = new IpPrefix(IPV4_BYTES, 128);
	fail("Expected IllegalArgumentException: invalid prefix length");
	} catch (RuntimeException expected) { }

	try {
	p = new IpPrefix(IPV4_BYTES, -1);
	fail("Expected IllegalArgumentException: negative prefix length");
	} catch (RuntimeException expected) { }

	p = new IpPrefix(IPV6_BYTES, 128);
	assertEquals("2001:db8:dead:beef:f00::a0/128", p.toString());

	p = new IpPrefix(IPV6_BYTES, 122);
	assertEquals("2001:db8:dead:beef:f00::80/122", p.toString());

	p = new IpPrefix(IPV6_BYTES, 64);
	assertEquals("2001:db8:dead:beef::/64", p.toString());

	p = new IpPrefix(IPV6_BYTES, 3);
	assertEquals("2000::/3", p.toString());

	p = new IpPrefix(IPV6_BYTES, 0);
	assertEquals("::/0", p.toString());

	try {
	p = new IpPrefix(IPV6_BYTES, -1);
	fail("Expected IllegalArgumentException: negative prefix length");
	} catch (RuntimeException expected) { }

	try {
	p = new IpPrefix(IPV6_BYTES, 129);
	fail("Expected IllegalArgumentException: negative prefix length");
	} catch (RuntimeException expected) { }

	}

	@Test
	public void testEquals() {
	IpPrefix p1, p2;

	p1 = new IpPrefix("192.0.2.251/23");
	p2 = new IpPrefix(new byte[]{(byte) 192, (byte) 0, (byte) 2, (byte) 251}, 23);
	assertEqualBothWays(p1, p2);

	p1 = new IpPrefix("192.0.2.5/23");
	assertEqualBothWays(p1, p2);

	p1 = new IpPrefix("192.0.2.5/24");
	assertNotEqualEitherWay(p1, p2);

	p1 = new IpPrefix("192.0.4.5/23");
	assertNotEqualEitherWay(p1, p2);


	p1 = new IpPrefix("2001:db8:dead:beef:f00::80/122");
	p2 = new IpPrefix(IPV6_BYTES, 122);
	assertEquals("2001:db8:dead:beef:f00::80/122", p2.toString());
	assertEqualBothWays(p1, p2);

	p1 = new IpPrefix("2001:db8:dead:beef:f00::bf/122");
	assertEqualBothWays(p1, p2);

	p1 = new IpPrefix("2001:db8:dead:beef:f00::8:0/123");
	assertNotEqualEitherWay(p1, p2);

	p1 = new IpPrefix("2001:db8:dead:beef::/122");
	assertNotEqualEitherWay(p1, p2);

	// 192.0.2.4/32 != c000:0204::/32.
	byte[] ipv6bytes = new byte[16];
	System.arraycopy(IPV4_BYTES, 0, ipv6bytes, 0, IPV4_BYTES.length);
	p1 = new IpPrefix(ipv6bytes, 32);
	assertEqualBothWays(p1, new IpPrefix("c000:0204::/32"));

	p2 = new IpPrefix(IPV4_BYTES, 32);
	assertNotEqualEitherWay(p1, p2);
	}

	@Test
	public void testContainsInetAddress() {
	IpPrefix p = new IpPrefix("2001:db8:f00::ace:d00d/127");
	assertTrue(p.contains(address("2001:db8:f00::ace:d00c")));
	assertTrue(p.contains(address("2001:db8:f00::ace:d00d")));
	assertFalse(p.contains(address("2001:db8:f00::ace:d00e")));
	assertFalse(p.contains(address("2001:db8:f00::bad:d00d")));
	assertFalse(p.contains(address("2001:4868:4860::8888")));
	assertFalse(p.contains(address("8.8.8.8")));

	p = new IpPrefix("192.0.2.0/23");
	assertTrue(p.contains(address("192.0.2.43")));
	assertTrue(p.contains(address("192.0.3.21")));
	assertFalse(p.contains(address("192.0.0.21")));
	assertFalse(p.contains(address("8.8.8.8")));
	assertFalse(p.contains(address("2001:4868:4860::8888")));

	IpPrefix ipv6Default = new IpPrefix("::/0");
	assertTrue(ipv6Default.contains(address("2001:db8::f00")));
	assertFalse(ipv6Default.contains(address("192.0.2.1")));

	IpPrefix ipv4Default = new IpPrefix("0.0.0.0/0");
	assertTrue(ipv4Default.contains(address("255.255.255.255")));
	assertTrue(ipv4Default.contains(address("192.0.2.1")));
	assertFalse(ipv4Default.contains(address("2001:db8::f00")));
	}

	@Test
	public void testContainsIpPrefix() {
	assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("0.0.0.0/0")));
	assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/0")));
	assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/8")));
	assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/24")));
	assertTrue(new IpPrefix("0.0.0.0/0").containsPrefix(new IpPrefix("1.2.3.4/23")));

	assertTrue(new IpPrefix("1.2.3.4/8").containsPrefix(new IpPrefix("1.2.3.4/8")));
	assertTrue(new IpPrefix("1.2.3.4/8").containsPrefix(new IpPrefix("1.254.12.9/8")));
	assertTrue(new IpPrefix("1.2.3.4/21").containsPrefix(new IpPrefix("1.2.3.4/21")));
	assertTrue(new IpPrefix("1.2.3.4/32").containsPrefix(new IpPrefix("1.2.3.4/32")));

	assertTrue(new IpPrefix("1.2.3.4/20").containsPrefix(new IpPrefix("1.2.3.0/24")));

	assertFalse(new IpPrefix("1.2.3.4/32").containsPrefix(new IpPrefix("1.2.3.5/32")));
	assertFalse(new IpPrefix("1.2.3.4/8").containsPrefix(new IpPrefix("2.2.3.4/8")));
	assertFalse(new IpPrefix("0.0.0.0/16").containsPrefix(new IpPrefix("0.0.0.0/15")));
	assertFalse(new IpPrefix("100.0.0.0/8").containsPrefix(new IpPrefix("99.0.0.0/8")));

	assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("::/0")));
	assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/1")));
	assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("3d8a:661:a0::770/8")));
	assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/8")));
	assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/64")));
	assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/113")));
	assertTrue(new IpPrefix("::/0").containsPrefix(new IpPrefix("2001:db8::f00/128")));

	assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
	new IpPrefix("2001:db8:f00::ace:d00d/64")));
	assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
	new IpPrefix("2001:db8:f00::ace:d00d/120")));
	assertFalse(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
	new IpPrefix("2001:db8:f00::ace:d00d/32")));
	assertFalse(new IpPrefix("2001:db8:f00::ace:d00d/64").containsPrefix(
	new IpPrefix("2006:db8:f00::ace:d00d/96")));

	assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/128").containsPrefix(
	new IpPrefix("2001:db8:f00::ace:d00d/128")));
	assertTrue(new IpPrefix("2001:db8:f00::ace:d00d/100").containsPrefix(
	new IpPrefix("2001:db8:f00::ace:ccaf/110")));

	assertFalse(new IpPrefix("2001:db8:f00::ace:d00d/128").containsPrefix(
	new IpPrefix("2001:db8:f00::ace:d00e/128")));
	assertFalse(new IpPrefix("::/30").containsPrefix(new IpPrefix("::/29")));
	}

	@Test
	public void testHashCode() {
	IpPrefix p = new IpPrefix(new byte[4], 0);
	Random random = new Random();
	for (int i = 0; i < 100; i++) {
	final IpPrefix oldP = p;
	if (random.nextBoolean()) {
	// IPv4.
	byte[] b = new byte[4];
	random.nextBytes(b);
	p = new IpPrefix(b, random.nextInt(33));
	} else {
	// IPv6.
	byte[] b = new byte[16];
	random.nextBytes(b);
	p = new IpPrefix(b, random.nextInt(129));
	}
	if (p.equals(oldP)) {
	assertEquals(p.hashCode(), oldP.hashCode());
	}
	if (p.hashCode() != oldP.hashCode()) {
	assertNotEquals(p, oldP);
	}
	}
	}

	@Test
	public void testHashCodeIsNotConstant() {
	IpPrefix[] prefixes = {
	new IpPrefix("2001:db8:f00::ace:d00d/127"),
	new IpPrefix("192.0.2.0/23"),
	new IpPrefix("::/0"),
	new IpPrefix("0.0.0.0/0"),
	};
	for (int i = 0; i < prefixes.length; i++) {
	for (int j = i + 1; j < prefixes.length; j++) {
	assertNotEquals(prefixes[i].hashCode(), prefixes[j].hashCode());
	}
	}
	}

	@Test
	public void testMappedAddressesAreBroken() {
	// 192.0.2.0/24 != ::ffff:c000:0204/120, but because we use InetAddress,
	// we are unable to comprehend that.
	byte[] ipv6bytes = {
	(byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0, (byte) 0, (byte) 0xff, (byte) 0xff,
	(byte) 192, (byte) 0, (byte) 2, (byte) 0};
	IpPrefix p = new IpPrefix(ipv6bytes, 120);
	assertEquals(16, p.getRawAddress().length); // Fine.
	assertArrayEquals(ipv6bytes, p.getRawAddress()); // Fine.

	// Broken.
	assertEquals("192.0.2.0/120", p.toString());
	assertEquals(InetAddress.parseNumericAddress("192.0.2.0"), p.getAddress());
	}

	@Test
	public void testParceling() {
	IpPrefix p;

	p = new IpPrefix("2001:4860:db8::/64");
	assertParcelingIsLossless(p);
	assertTrue(p.isIPv6());

	p = new IpPrefix("192.0.2.0/25");
	assertParcelingIsLossless(p);
	assertTrue(p.isIPv4());

	assertFieldCountEquals(2, IpPrefix.class);
	}
	}