useSniffing := !hasPrefix && index != -1
	return listenerPort, useSniffing, err
}

// TODO: merge with IstioEgressListenerWrapper.selectVirtualServices
// selectVirtualServices selects the virtual services by matching given services' host names.
func selectVirtualServices(virtualServices []config.Config, servicesByName map[host.Name]*model.Service) []config.Config {
	out := make([]config.Config, 0)

	"istio.io/istio/pkg/maps"
	"istio.io/istio/pkg/util/protomarshal"
	"istio.io/istio/pkg/util/sets"
)

// SelectVirtualServices selects the virtual services by matching given services' host names.
// This function is used by sidecar converter.
func SelectVirtualServices(vsidx virtualServiceIndex, configNamespace string, hostsByNamespace map[string]hostClassification) []config.Config {

		}

		// allHosts contains the exact hosts and wildcard hosts,
		// since SelectVirtualServices will use `Matches` semantic matching.
		hc := hostsByNamespace[ns]
		hc.allHosts = append(hc.allHosts, hName)
		hostsByNamespace[ns] = hc
	}

	out.virtualServices = SelectVirtualServices(ps.virtualServiceIndex, configNamespace, hostsByNamespace)
	svces := ps.servicesExportedToNamespace(configNamespace)

		Meta: config.Meta{
			GroupVersionKind: gvk.VirtualService,
			Name:             "acme-v3",
			Namespace:        "not-default",
		},
		Spec: virtualServiceSpec6,
	}
	configs := selectVirtualServices(
		[]config.Config{virtualService1, virtualService2, virtualService3, virtualService4, virtualService5, virtualService6},
		servicesByName)

				virtualService4,
				virtualService5,
				virtualService6,
				virtualService7,
				virtualService8,
				virtualService9,
			},
		},
	}

	configs := SelectVirtualServices(index, "some-ns", hostsByNamespace)
	expectedVS := []string{
		virtualService1.Name, virtualService2.Name, virtualService4.Name, virtualService7.Name,
		virtualService8.Name, virtualService9.Name,
	}

//
// Note that for generating the imported virtual services of sidecar egress
// listener, we don't call this function to copy configs for performance issues.
// Instead, we pass the virtualServiceIndex directly into SelectVirtualServices
// function.
func (ps *PushContext) VirtualServicesForGateway(proxyNamespace, gateway string) []config.Config {
	name := types.NamespacedName{
		Namespace: proxyNamespace,
		Name:      gateway,
	}