// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname defaultNS
var defaultNS = []string{"127.0.0.1:53", "[::1]:53"}

var getHostname = os.Hostname // variable for testing

type dnsConfig struct {
	servers       []string      // server addresses (in host:port form) to use
	search        []string      // rooted suffixes to append to local name

// license that can be found in the LICENSE file.

package net

import (
	"internal/syscall/windows"
	"syscall"
	"time"
)

func dnsReadConfig(ignoredFilename string) (conf *dnsConfig) {
	conf = &dnsConfig{
		ndots:    1,
		timeout:  5 * time.Second,
		attempts: 2,
	}
	defer func() {
		if len(conf.servers) == 0 {
			conf.servers = defaultNS
		}
	}()
	aas, err := adapterAddresses()

	}
	return &opts, nil, nil
}

func (f *FakeRuntimeHelper) GetPodCgroupParent(pod *v1.Pod) string {
	return ""
}

func (f *FakeRuntimeHelper) GetPodDNS(pod *v1.Pod) (*runtimeapi.DNSConfig, error) {
	return &runtimeapi.DNSConfig{
		Servers:  f.DNSServers,
		Searches: f.DNSSearches,
		Options:  f.DNSOptions}, f.Err
}

// This is not used by docker runtime.

	// traffic to port 53 will be captured.
	if c.RedirectDNS && !c.CaptureAllDNS {
		dnsConfig, err := dns.ClientConfigFromFile("/etc/resolv.conf")
		if err != nil {
			log.Fatalf("failed to load /etc/resolv.conf: %v", err)
		}
		c.DNSServersV4, c.DNSServersV6 = netutil.IPsSplitV4V6(dnsConfig.Servers)
	}

package net

import (
	"internal/bytealg"
	"internal/stringslite"
	"net/netip"
	"time"
)

// See resolv.conf(5) on a Linux machine.
func dnsReadConfig(filename string) *dnsConfig {
	conf := &dnsConfig{
		ndots:    1,
		timeout:  5 * time.Second,
		attempts: 2,
	}
	file, err := open(filename)
	if err != nil {
		conf.servers = defaultNS
		conf.search = dnsDefaultSearch()
		conf.err = err

	// traffic to port 53 will be captured.
	if c.RedirectDNS && !c.CaptureAllDNS {
		dnsConfig, err := dns.ClientConfigFromFile("/etc/resolv.conf")
		if err != nil {
			return fmt.Errorf("failed to load /etc/resolv.conf: %v", err)
		}
		c.DNSServersV4, c.DNSServersV6 = netutil.IPsSplitV4V6(dnsConfig.Servers)
	}
	return nil
}

// mock net.InterfaceAddrs to make its unit test become available
var (

      # the application will first try to resolve the hostname (a, a.ns, etc.) as is
      # before attempting to add the search namespaces.
      dnsPolicy: None
      dnsConfig:
        nameservers:
        - "8.8.8.8"
        options:
        - name: "ndots"
          value: "1"
{{- if $.VM.IstioHost }}
      # Override the istiod host to force traffic through east-west gateway.

}

func TestAmbientInstallMultiNamespace(t *testing.T) {
	tests := []struct {
		name     string
		nsConfig NamespaceConfig
	}{{
		name: "isolated-istio-cni",
		nsConfig: NewNamespaceConfig(types.NamespacedName{
			Name: CniReleaseName, Namespace: "istio-cni",
		}),
	}, {
		name: "isolated-istio-cni-and-ztunnel",
		nsConfig: NewNamespaceConfig(types.NamespacedName{
			Name: CniReleaseName, Namespace: "istio-cni",

	return newKube(ctx, cfg)
}

// NewOrFail calls New and fails test if it returns error
func NewOrFail(t test.Failer, ctx resource.Context, nsConfig Config) Instance {
	t.Helper()
	i, err := New(ctx, nsConfig)
	if err != nil {
		t.Fatalf("namespace.NewOrFail: %v", err)
	}
	return i
}

// GetAll returns all namespaces that have exist in the context.