/*
 * Copyright (c) 2019  InterDigital Communications, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package main

import (
	"context"
	"net"
	"strings"
	"time"
)

func resolve(addr string, timeout time.Duration) ([]net.IPAddr, error) {
	if strings.ContainsRune(addr, '%') {
		ipaddr, err := net.ResolveIPAddr("ip", addr)
		if err != nil {
			return nil, err
		}
		return []net.IPAddr{*ipaddr}, nil
	}

	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()

	return net.DefaultResolver.LookupIPAddr(ctx, addr)
}
