// Invalid: 10.01.2.3 or 2001:db8:0:0:0::1
message IPAddress {
  // Standard object's metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // spec is the desired state of the IPAddress.

      else -> verifyHostname(host, certificate)
    }
  }

  /** Returns true if [certificate] matches [ipAddress]. */
  private fun verifyIpAddress(
    ipAddress: String,
    certificate: X509Certificate,
  ): Boolean {
    val canonicalIpAddress = ipAddress.toCanonicalHost()

    return getSubjectAltNames(certificate, ALT_IPA_NAME).any {
      canonicalIpAddress == it.toCanonicalHost()
    }
  }

  C1_NODE="${C1}-control-plane"
  C2_NODE="${C2}-control-plane"
  C1_DOCKER_IP=$(docker inspect -f "{{ .NetworkSettings.Networks.kind.IPAddress }}" "${C1_NODE}")
  C2_DOCKER_IP=$(docker inspect -f "{{ .NetworkSettings.Networks.kind.IPAddress }}" "${C2_NODE}")
  if [ "${POD_TO_POD_AND_SERVICE_CONNECTIVITY}" -eq 1 ]; then
    # Set up routing rules for inter-cluster direct pod to pod & service communication

	}

	return apiEndpoints
}

// isHostIP - helper for validating if the provided arg is an ip address.
func isHostIP(ipAddress string) bool {
	host, _, err := net.SplitHostPort(ipAddress)
	if err != nil {
		host = ipAddress
	}
	// Strip off IPv6 zone information.
	if i := strings.Index(host, "%"); i > -1 {
		host = host[:i]
	}
	return net.ParseIP(host) != nil
}

        .addSubjectAlternativeName("cash.app")
        .build()
    val certificate = heldCertificate.certificate
    assertThat(certificate.subjectAlternativeNames.toList()).containsExactly(
      listOf(GeneralName.iPAddress, "1.1.1.1"),
      listOf(GeneralName.dNSName, "cash.app"),
    )
  }

  @Test
  fun commonName() {
    val heldCertificate =
      HeldCertificate.Builder()
        .commonName("cash.app")

  if [[ `uname -s | grep -P '^MSYS_NT'` ]]; then
    # Allow requests from the container.
    # Additional setup is contained in ci/official/envs/rbe.
    CONTAINER_IP_ADDR=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' tf)
    netsh advfirewall firewall add rule name="Allow Metadata Proxy" dir=in action=allow protocol=TCP localport=80 remoteip="$CONTAINER_IP_ADDR"
  fi

fi

  # port-forwarding is required for the container to detect it's running on GCE.
  export IP_ADDR=$(powershell -command "(Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias 'vEthernet (nat)').IPAddress")
  netsh interface portproxy add v4tov4 listenaddress=$IP_ADDR listenport=80 connectaddress=169.254.169.254 connectport=80
  # A local firewall rule for the container is added in
  # ci/official/utilities/setup_docker.sh.
else

   *   directoryName                   [4]     Name,
   *   ediPartyName                    [5]     EDIPartyName,
   *   uniformResourceIdentifier       [6]     IA5String,
   *   iPAddress                       [7]     OCTET STRING,
   *   registeredID                    [8]     OBJECT IDENTIFIER
   * }
   * ```
   *

import dataclasses
import datetime
from collections import defaultdict, deque
from decimal import Decimal
from enum import Enum
from ipaddress import (
    IPv4Address,
    IPv4Interface,
    IPv4Network,
    IPv6Address,
    IPv6Interface,
    IPv6Network,
)
from pathlib import Path, PurePath
from re import Pattern
from types import GeneratorType
from typing import Any, Callable, Dict, List, Optional, Tuple, Type, Union

    server.enqueue(
      MockResponse.Builder()
        .body("abc")
        .build(),
    )
    val ipAddress = InetAddress.getLoopbackAddress().hostAddress
    val call =
      client.newCall(
        Request.Builder()
          .url(server.url("/").newBuilder().host(ipAddress!!).build())
          .build(),
      )
    val response = call.execute()
    assertThat(response.code).isEqualTo(200)