66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
// Copyright 2016 CNI authors
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//
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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 main
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import (
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"bufio"
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"os"
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"strings"
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"github.com/containernetworking/cni/pkg/types"
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)
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// parseResolvConf parses an existing resolv.conf in to a DNS struct
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func parseResolvConf(filename string) (*types.DNS, error) {
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fp, err := os.Open(filename)
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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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dns := types.DNS{}
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scanner := bufio.NewScanner(fp)
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for scanner.Scan() {
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line := scanner.Text()
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line = strings.TrimSpace(line)
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// Skip comments, empty lines
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if len(line) == 0 || line[0] == '#' || line[0] == ';' {
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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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switch fields[0] {
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case "nameserver":
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dns.Nameservers = append(dns.Nameservers, fields[1])
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case "domain":
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dns.Domain = fields[1]
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case "search":
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dns.Search = append(dns.Search, fields[1:]...)
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case "options":
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dns.Options = append(dns.Options, fields[1:]...)
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}
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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return &dns, nil
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}
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