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61 lines
1.5 KiB
61 lines
1.5 KiB
// Copyright 2021 The Prometheus Authors |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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package osutil |
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import ( |
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"encoding" |
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"net" |
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"os" |
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) |
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// GetFQDN returns a FQDN if it's possible, otherwise falls back to hostname. |
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func GetFQDN() (string, error) { |
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hostname, err := os.Hostname() |
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if err != nil { |
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return "", err |
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} |
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ips, err := net.LookupIP(hostname) |
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if err != nil { |
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// Return the system hostname if we can't look up the IP address. |
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return hostname, nil |
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} |
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lookup := func(ipStr encoding.TextMarshaler) (string, error) { |
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ip, err := ipStr.MarshalText() |
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if err != nil { |
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return "", err |
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} |
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hosts, err := net.LookupAddr(string(ip)) |
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if err != nil || len(hosts) == 0 { |
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return "", err |
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} |
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return hosts[0], nil |
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} |
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for _, addr := range ips { |
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if ip := addr.To4(); ip != nil { |
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if fqdn, err := lookup(ip); err == nil { |
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return fqdn, nil |
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} |
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} |
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if ip := addr.To16(); ip != nil { |
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if fqdn, err := lookup(ip); err == nil { |
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return fqdn, nil |
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} |
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} |
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} |
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return hostname, nil |
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}
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