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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
// +build go1.8
package utilization
import (
"context"
"net"
"strings"
)
func lookupAddr(addr string) ([]string, error) {
ctx, cancel := context.WithTimeout(context.Background(), lookupAddrTimeout)
defer cancel()
r := &net.Resolver{}
return r.LookupAddr(ctx, addr)
}
func getFQDN(candidateIPs []string) string {
for _, ip := range candidateIPs {
names, _ := lookupAddr(ip)
if len(names) > 0 {
return strings.TrimSuffix(names[0], ".")
}
}
return ""
}
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