content: /*
   * 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;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
  import static org.assertj.core.api.Assertions.assertThatNoException;
  
  import java.net.UnknownHostException;
  import org.junit.Test;
  
  public class SubnetTest {
    @Test
    public void should_parse_to_correct_ipv4_subnet() throws UnknownHostException {
      Subnet subnet = Subnet.parse("100.64.0.0/15");
      assertThat(subnet.getSubnet()).containsExactly(100, 64, 0, 0);
      assertThat(subnet.getNetworkMask()).containsExactly(255, 254, 0, 0);
      assertThat(subnet.getUpper()).containsExactly(100, 65, 255, 255);
      assertThat(subnet.getLower()).containsExactly(100, 64, 0, 0);
    }
  
    @Test
    public void should_parse_to_correct_ipv6_subnet() throws UnknownHostException {
      Subnet subnet = Subnet.parse("2001:db8:85a3::8a2e:370:0/111");
      assertThat(subnet.getSubnet())
          .containsExactly(32, 1, 13, 184, 133, 163, 0, 0, 0, 0, 138, 46, 3, 112, 0, 0);
      assertThat(subnet.getNetworkMask())
          .containsExactly(
              255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 0, 0);
      assertThat(subnet.getUpper())
          .containsExactly(32, 1, 13, 184, 133, 163, 0, 0, 0, 0, 138, 46, 3, 113, 255, 255);
      assertThat(subnet.getLower())
          .containsExactly(32, 1, 13, 184, 133, 163, 0, 0, 0, 0, 138, 46, 3, 112, 0, 0);
    }
  
    @Test
    public void should_parse_to_correct_ipv6_subnet_ipv4_convertible() throws UnknownHostException {
      Subnet subnet = Subnet.parse("::ffff:6440:0/111");
      assertThat(subnet.getSubnet())
          .containsExactly(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 100, 64, 0, 0);
      assertThat(subnet.getNetworkMask())
          .containsExactly(
              255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 0, 0);
      assertThat(subnet.getUpper())
          .containsExactly(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 100, 65, 255, 255);
      assertThat(subnet.getLower())
          .containsExactly(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 100, 64, 0, 0);
    }
  
    @Test
    public void should_fail_on_invalid_cidr_format() {
      assertThatIllegalArgumentException()
          .isThrownBy(() -> Subnet.parse("invalid"))
          .withMessage("Invalid subnet: invalid");
    }
  
    @Test
    public void should_parse_bounding_prefix_lengths_correctly() {
      assertThatNoException().isThrownBy(() -> Subnet.parse("0.0.0.0/0"));
      assertThatNoException().isThrownBy(() -> Subnet.parse("100.64.0.0/32"));
    }
  
    @Test
    public void should_fail_on_invalid_prefix_length() {
      assertThatIllegalArgumentException()
          .isThrownBy(() -> Subnet.parse("100.64.0.0/-1"))
          .withMessage("Prefix length -1 must be within [0; 32]");
      assertThatIllegalArgumentException()
          .isThrownBy(() -> Subnet.parse("100.64.0.0/33"))
          .withMessage("Prefix length 33 must be within [0; 32]");
    }
  
    @Test
    public void should_fail_on_not_prefix_block_subnet_ipv4() {
      assertThatIllegalArgumentException()
          .isThrownBy(() -> Subnet.parse("100.65.0.0/15"))
          .withMessage("Subnet 100.65.0.0/15 must be represented as a network prefix block");
    }
  
    @Test
    public void should_fail_on_not_prefix_block_subnet_ipv6() {
      assertThatIllegalArgumentException()
          .isThrownBy(() -> Subnet.parse("::ffff:6441:0/111"))
          .withMessage("Subnet ::ffff:6441:0/111 must be represented as a network prefix block");
    }
  
    @Test
    public void should_return_true_on_containing_address() throws UnknownHostException {
      Subnet subnet = Subnet.parse("100.64.0.0/15");
      assertThat(subnet.contains(new byte[] {100, 64, 0, 0})).isTrue();
      assertThat(subnet.contains(new byte[] {100, 65, (byte) 255, (byte) 255})).isTrue();
      assertThat(subnet.contains(new byte[] {100, 65, 100, 100})).isTrue();
    }
  
    @Test
    public void should_return_false_on_not_containing_address() throws UnknownHostException {
      Subnet subnet = Subnet.parse("100.64.0.0/15");
      assertThat(subnet.contains(new byte[] {100, 63, (byte) 255, (byte) 255})).isFalse();
      assertThat(subnet.contains(new byte[] {100, 66, 0, 0})).isFalse();
      // IPv6 cannot be contained by IPv4 subnet.
      assertThat(subnet.contains(new byte[16])).isFalse();
    }
  }
  