"math/rand"
	"net"
	"runtime"
	"sync"
	"testing"
	"time"
)

// MakePipe creates a connection between two endpoints and returns the pair
// as c1 and c2, such that anything written to c1 is read by c2 and vice-versa.
// The stop function closes all resources, including c1, c2, and the underlying
// net.Listener (if there is one), and should not be nil.
type MakePipe func() (c1, c2 net.Conn, stop func(), err error)

// in two separate conntrack zones to avoid issues with UDP conntrack race conditions.
// Traffic that goes from istio to DNS servers and vice versa are zone 1 and traffic from
// DNS client to istio and vice versa goes to zone 2
func addConntrackZoneDNSUDP(
	f UDPRuleApplier, proxyUID, proxyGID string, dnsServersV4 []string, dnsServersV6 []string, captureAllDNS bool,
) {
	// TODO: add ip6 as well

		// and the types of corresponding elements unify.
		if y, ok := y.(*Tuple); ok {
			if x.Len() == y.Len() {
				if x != nil {
					for i, v := range x.vars {
						w := y.vars[i]
						if !u.nify(v.typ, w.typ, mode, p) {
							return false
						}
					}
				}
				return true
			}
		}

	case *Signature:

   *       instances.
   *   <li>For the constructor or static factory method used to construct instances, it's checked
   *       that when equal parameters are passed, the result instance should also be equal; and vice
   *       versa.
   *   <li>Inequality check is not performed against state mutation methods such as {@link
   *       List#add}, or functional update methods such as {@link
   *       com.google.common.base.Joiner#skipNulls}.

		podIPs                                     []string               // the pod IPs
		expectedEnvs                               []kubecontainer.EnvVar // a set of expected environment vars
		expectedError                              bool                   // does the test fail
		expectedEvent                              string                 // does the test emit an event
	}{
		{

# Verify that the right utilities and such are installed for building Kube. Set
# up some dynamic constants.
# Args:
#   $1 - boolean of whether to require functioning docker (default true)
#
# Vars set:
#   KUBE_ROOT_HASH
#   KUBE_BUILD_IMAGE_TAG_BASE
#   KUBE_BUILD_IMAGE_TAG
#   KUBE_BUILD_IMAGE
#   KUBE_BUILD_CONTAINER_NAME_BASE
#   KUBE_BUILD_CONTAINER_NAME
#   KUBE_DATA_CONTAINER_NAME_BASE

			if _, err := modfetch.DownloadZip(ctx, mActual); err != nil {
				verb := "upgraded"
				if gover.ModCompare(m.Path, m.Version, old.Version) < 0 {
					verb = "downgraded"
				}
				replaced := ""
				if mActual != m {
					replaced = fmt.Sprintf(" (replaced by %s)", mActual)
				}
				err = fmt.Errorf("%s %s %s => %s%s: error finding sum for %s: %v", verb, m.Path, old.Version, m.Version, replaced, mActual, err)

   * calling {@code get(rowKey, columnKey)} on the original table. Updating the original table
   * changes the contents of the transposed table and vice versa.
   *
   * <p>The returned table supports update operations as long as the input table supports the
   * analogous operation with swapped rows and columns. For example, in a {@link HashBasedTable}

							Kind:  flowcontrol.SubjectKindGroup,
							Group: &flowcontrol.GroupSubject{Name: "system:authenticated"},
						}},
						ResourceRules: []flowcontrol.ResourcePolicyRule{{
							Verbs:        all,
							APIGroups:    all,
							Resources:    all,
							ClusterScope: true,
							Namespaces:   all,
						}},
					}, {
						Subjects: []flowcontrol.Subject{{

            "type": "string"
          },
          "type": "array",
          "x-kubernetes-list-type": "set"
        },
        "verbs": {
          "description": "`verbs` is a list of matching verbs and may not be empty. \"*\" matches all verbs. If it is present, it must be the only entry. Required.",
          "items": {
            "type": "string"
          },
          "type": "array",