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