34 lines
729 B
Go
34 lines
729 B
Go
package resolve
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import (
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"bufio"
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"os"
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"strings"
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)
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// GetDefaultNameserver reads `/etc/resolv.conf` to determine the default
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// nameserver configured. Returns an error if unable to parse or
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// no nameserver specified. It returns as soon as it finds a line
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// with `nameserver` prefix.
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// An example format:
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// `nameserver 127.0.0.1`
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func GetDefaultNameserver() (string, error) {
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file, err := os.Open("/etc/resolv.conf")
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if err != nil {
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return "", err
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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if strings.HasPrefix(scanner.Text(), "nameserver") {
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return strings.Fields(scanner.Text())[1], nil
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}
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}
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if err := scanner.Err(); err != nil {
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return "", err
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}
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return "", err
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}
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