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
}

// extractHostPort - extracts host/port from many address formats

	for _, cluster := range c.clusters.ClusterStatuses {
		for _, host := range cluster.HostStatuses {
			if filter.Verify(host, cluster.Name) {
				addr := retrieveEndpointAddress(host)
				port := retrieveEndpointPort(host)
				status := retrieveEndpointStatus(host)
				outlierCheck := retrieveFailedOutlierCheck(host)

	m := &Manager{
		ID:          uuid.New(),
		targets:     make(map[string]*Connection, len(o.Hosts)),
		local:       o.Local,
		authRequest: o.AuthRequest,
	}
	m.handlers.init()
	if ctx == nil {
		ctx = context.Background()
	}
	for _, host := range o.Hosts {
		if host == o.Local {
			if found {
				return nil, fmt.Errorf("grid: local host found multiple times")
			}
			found = true
			// No connection to local.

	return func(ctx context.Context, network, addr string) (conn net.Conn, err error) {
		host, port, err := net.SplitHostPort(addr)
		if err != nil {
			return nil, err
		}

		if net.ParseIP(host) != nil {
			// For IP only setups there is no need for DNS lookups.
			return baseDialCtx(ctx, "tcp", addr)
		}

		ips, err := lookupHost(ctx, host)
		if err != nil {
			return nil, err
		}

		for _, ip := range ips {

		for k, v := range reqHeaders {
			inputBytes += len(k) + len(v)
		}

		// Calculate node name
		nodeName := r.Host
		if globalIsDistErasure {
			nodeName = globalLocalNodeName
		}
		if host, port, err := net.SplitHostPort(nodeName); err == nil {
			if port == "443" || port == "80" {
				nodeName = host
			}
		}

		// Calculate reqPath
		reqPath := r.URL.RawPath
		if reqPath == "" {

package http

import (
	"context"
	"net"
	"syscall"
	"time"
)

// CheckPortAvailability - check if given host and port is already in use.
// Note: The check method tries to listen on given port and closes it.
// It is possible to have a disconnected client in this tiny window of time.
func CheckPortAvailability(host, port string, opts TCPOptions) (err error) {
	lc := &net.ListenConfig{

	"istio.io/istio/pkg/log"
)

func getPidNamespace(pid int) string {
	return "/host/proc/" + strconv.Itoa(pid) + "/ns/net"
}

func runInHost[T any](f func() (T, error)) (T, error) {
	var res T
	ns, err := netns.GetNS(getPidNamespace(1))
	if err != nil {
		return res, fmt.Errorf("failed to get host network: %v", err)
	}
	err = ns.Do(func(ns netns.NetNS) error {
		var err error
		res, err = f()

		Timeout: 5 * time.Second,
	}
	var res TestGrid
	res.Hosts = hosts
	ready := make(chan struct{})
	ctx, cancel := context.WithCancel(context.Background())
	res.cancel = cancel
	for i, host := range hosts {
		manager, err := NewManager(ctx, ManagerOptions{
			Dialer: dialer.DialContext,
			Local:  host,
			Hosts:  hosts,
			AuthRequest: func(r *http.Request) error {
				return nil
			},

	reqQueries := r.Form
	// find whether "host" is part of list of signed headers.
	// if not return ErrUnsignedHeaders. "host" is mandatory.
	if !slices.Contains(signedHeaders, "host") {
		return nil, ErrUnsignedHeaders
	}
	extractedSignedHeaders := make(http.Header)
	for _, header := range signedHeaders {
		// `host` will not be found in the headers, can be found in r.Host.

}

// ReqInfo stores the request info.
// Reading/writing directly to struct requires appropriate R/W lock.
type ReqInfo struct {
	RemoteHost   string           // Client Host/IP
	Host         string           // Node Host/IP
	UserAgent    string           // User Agent
	DeploymentID string           // x-minio-deployment-id
	RequestID    string           // x-amz-request-id