The framework for this implementation of the CNI plugin is based on the
[containernetworking sample plugin](https://github.com/containernetworking/plugins/tree/main/plugins/sample)

The details for the deployment & installation of this plugin were pretty much lifted directly from the
[Calico CNI plugin](https://github.com/projectcalico/cni-plugin).

Specifically:

// See the License for the specific language governing permissions and
// limitations under the License.

package describe

import (
	"bytes"
	"context"
	"fmt"
	"os"
	"strings"
	"testing"

	"github.com/google/go-cmp/cmp"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	klabels "k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/intstr"

// limitations under the License.

package waypoint

import (
	"cmp"
	"context"
	"fmt"
	"strings"
	"sync"
	"text/tabwriter"
	"time"

	"github.com/hashicorp/go-multierror"
	"github.com/spf13/cobra"
	"k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	gateway "sigs.k8s.io/gateway-api/apis/v1"
	"sigs.k8s.io/yaml"

      (strdict
        "gateway.networking.k8s.io/gateway-name" .Name
        "istio.io/gateway-name" .Name
      ) | nindent 4 }}
  {{- if ge .KubeVersion 128 }}
  # Safe since 1.28: https://github.com/kubernetes/kubernetes/pull/117412
  ownerReferences:
  - apiVersion: gateway.networking.k8s.io/v1beta1
    kind: Gateway
    name: "{{.Name}}"
    uid: "{{.UID}}"
  {{- end }}
---
apiVersion: apps/v1

  volumes:
  - emptyDir:
    name: workload-socket
  {{- if eq .Values.global.caName "GkeWorkloadCertificate" }}
  - name: gke-workload-certificate
    csi:
      driver: workloadcertificates.security.cloud.google.com
  {{- else }}
  - emptyDir:
    name: workload-certs
  {{- end }}
  {{- if (isset .ObjectMeta.Annotations `sidecar.istio.io/bootstrapOverride`) }}
  - name: custom-bootstrap-volume
    configMap:

In its initial implementations, the ztunnel was actually implemented in 3 different ways: a bespoke Rust implementation, a bespoke Go implementation, and in Envoy.

In the end, [after evaluation](https://docs.google.com/document/d/1c2123cKuYsBDpIon9FFdctWTUIMFweSjgwG7r8l3818/edit), the decision was to move forward with a Rust implementation.

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net"
	"net/url"
	"os"
	"strings"

	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
	xdsstatus "github.com/envoyproxy/go-control-plane/envoy/service/status/v3"
	"google.golang.org/grpc"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	"istio.io/api/label"

// limitations under the License.

package tag

import (
	"cmp"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"strings"
	"text/tabwriter"

	"github.com/spf13/cobra"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"

	"istio.io/istio/istioctl/pkg/cli"
	"istio.io/istio/istioctl/pkg/util"
	"istio.io/istio/istioctl/pkg/util/formatting"

  // traffic based on the specified IngressRuleValue.
  //
  // host can be "precise" which is a domain name without the terminating dot of
  // a network host (e.g. "foo.bar.com") or "wildcard", which is a domain name
  // prefixed with a single wildcard label (e.g. "*.foo.com").
  // The wildcard character '*' must appear by itself as the first DNS label and
  // matches only a single label. You cannot have a wildcard label by itself (e.g. Host == "*").

// limitations under the License.

package mesh

import (
	"context"
	"fmt"
	"io"
	"os"
	"sort"
	"strings"
	"time"

	"github.com/fatih/color"
	"github.com/spf13/cobra"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"

	"istio.io/api/operator/v1alpha1"
	"istio.io/istio/istioctl/pkg/cli"