ContainerImage.Pinniped/test/testlib/iplookup_go1.14.go

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// Copyright 2020-2022 the Pinniped contributors. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//go:build go1.14
// +build go1.14
package testlib
import (
"context"
"net"
)
// LookupIP looks up the IP address of the provided hostname, preferring IPv4.
func LookupIP(ctx context.Context, hostname string) ([]net.IP, error) {
ips, err := net.DefaultResolver.LookupIPAddr(ctx, hostname)
if err != nil {
return nil, err
}
// Filter out to only IPv4 addresses
var results []net.IP
for _, ip := range ips {
if ip.IP.To4() != nil {
results = append(results, ip.IP)
}
}
return results, nil
}