https://github.com/bwesterb/go-zonefile

Go package to edit DNS/Bind zone files (preserving formatting & comments)
https://github.com/bwesterb/go-zonefile

go parser zone-files

Last synced: about 2 months ago
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Go package to edit DNS/Bind zone files (preserving formatting & comments)

• Host: GitHub
• URL: https://github.com/bwesterb/go-zonefile
• Owner: bwesterb
• License: lgpl-3.0
• Created: 2016-11-18T14:38:35.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2024-07-29T08:40:56.000Z (6 months ago)
• Last Synced: 2024-07-29T11:52:39.545Z (6 months ago)
• Topics: go, parser, zone-files
• Language: Go
• Homepage: https://godoc.org/github.com/bwesterb/go-zonefile
• Size: 22.5 KB
• Stars: 27
• Watchers: 3
• Forks: 9
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# go-zonefile

Go package to edit DNS/Bind zone files (preserving formatting & comments)

`go-zonefile` is not finished: interfaces, documentation and convenience functions are missing.

All the lexing and parsing is finished, though.

**[Online documentation and examples](https://godoc.org/github.com/bwesterb/go-zonefile)**

Bundled as an example (and actually the original reason why I wrote this package)

is the `inc-zonefile-serial` utility, which increments the serial in a zonefile:

```go

package main

import (

	"bytes"

	"fmt"

	"github.com/bwesterb/go-zonefile"

	"io/ioutil"

	"os"

	"strconv"

)

// Increments the serial of a zonefile

func main() {

	if len(os.Args) != 2 {

		fmt.Println("Usage:", os.Args[0], "")

		os.Exit(1)

	}

	// Load zonefile

	data, ioerr := ioutil.ReadFile(os.Args[1])

	if ioerr != nil {

		fmt.Println(os.Args[1], ioerr)

		os.Exit(2)

	}

	zf, perr := zonefile.Load(data)

	if perr != nil {

		fmt.Println(os.Args[1], perr.LineNo(), perr)

		os.Exit(3)

	}

	// Find SOA entry

	ok := false

	for _, e := range zf.Entries() {

		if !bytes.Equal(e.Type(), []byte("SOA")) {

			continue

		}

		vs := e.Values()

		if len(vs) != 7 {

			fmt.Println("Wrong number of parameters to SOA line")

			os.Exit(4)

		}

		serial, err := strconv.Atoi(string(vs[2]))

		if err != nil {

			fmt.Println("Could not parse serial:", err)

			os.Exit(5)

		}

		e.SetValue(2, []byte(strconv.Itoa(serial+1)))

		ok = true

		break

	}

	if !ok {

		fmt.Println("Could not find SOA entry")

		os.Exit(6)

	}

	fh, err := os.OpenFile(os.Args[1], os.O_WRONLY, 0)

	if err != nil {

		fmt.Println(os.Args[1], err)

		os.Exit(7)

	}

	_, err = fh.Write(zf.Save())

	if err != nil {

		fmt.Println(os.Args[1], err)

		os.Exit(8)

	}

}

```