57 lines
911 B
Go
57 lines
911 B
Go
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// +build linux darwin
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package resolvconf
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import (
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"bufio"
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"io"
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"os"
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"strings"
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)
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const (
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resolvConfPath = "/etc/resolv.conf"
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)
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// ParseResolvConf parse /etc/resolv.conf file and return nameservers
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func ParseResolvConf() ([]string, error) {
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fp, err := os.Open(resolvConfPath)
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if err != nil {
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return nil, err
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}
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defer fp.Close()
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return parse(fp)
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}
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func parse(fp io.Reader) ([]string, error) {
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var result []string
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bufRd := bufio.NewReader(fp)
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for {
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line, err := bufRd.ReadString('\n')
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if err != nil {
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if err != io.EOF {
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return nil, err
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}
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if line == "" {
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break
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}
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}
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line = strings.TrimSpace(line)
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// ignore comment, comment startwith #
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if strings.HasPrefix(line, "#") {
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continue
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}
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fields := strings.Fields(line)
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if len(fields) < 2 {
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continue
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}
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if fields[0] == "nameserver" {
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result = append(result, fields[1:]...)
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}
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}
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return result, nil
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}
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