dnsz

Generic DNS zone file parser and stringifier

All current and future record types are supported as the module makes no effort to parse a record's content. It is highly configurable and has no dependencies.

Usage

npm i dnsz

import {parseZone, stringifyZone} from "dnsz";

const data = parseZone("example.com 60 IN A 1.2.3.4");
// => {records: [{name: "example.com", ttl: 60, class: "IN", type: "A", content: "1.2.3.4"}]}

stringifyZone(data);
// => ";; A Records\nexample.com.\t60\tIN\tA\t1.2.3.4\n"

API

parseZone(str, [opts])

Parse a string of a DNS zone file and returns a data object.

• opts.replaceOrigin string: When specified, replaces any @ in name or content with it. Default: null.
• opts.crlf boolean: When true, emit \r\n instead of \n in header. Default: false.
• opts.defaultTTL number: Default TTL when absent and $TTL is not present. Default: 60.
• opts.dots boolean: Ensure trailing dots on FQDNs in content. Supports a limited amount of record types. Default: false.

stringifyZone(data, [opts])

Parse a data object and return a string with the zone file contents.

• opts.sections boolean: Whether to group records into sections. Default: true.
• opts.crlf boolean: When true, emit \r\n instead of \n for the resulting zone file. Default: false.
• opts.dots boolean: Ensure trailing dots on FQDNs in content. Supports a limited amount of record types. Default: false.

data object

• records: Array of record with these props:
  • name: The lowercase DNS name without a trailing dot, e.g. "example.com".
  • ttl: The TTL in seconds, e.g. 60.
  • class: The DNS class, e.g. "IN".
  • type: The record type, e.g. "A".
  • content: The record content, e.g. "2001:db8::1" or "example.com.".
  • comment: A comment, e.g. "a comment", null if absent.
• origin: The value of $ORIGIN in the zone file.
• ttl: The value of $TTL in the zone file.
• header: An optional header at the start of the file. Can be multiline. Does not include comment markers.

If data.origin is specified, the following things happen in the zone file output:

• A $ORIGIN variable is added.
• All occurences of data.origin within content are replaced with @.
• If data.origin matches the name of a record, name is replaced with @.

Example zone file

$ORIGIN originzone.com.

;; SOA Records
@   3600    IN  SOA originzone.com. root.originzone.com. 2031242781 7200 3600 86400 3600

;; A Records
@   60  IN  A   1.2.3.4 ; a comment
mx  60  IN  A   1.2.3.4 ; another comment

;; AAAA Records
@   120 IN  AAAA    2001:db8::1
mx  120 IN  AAAA    2001:db8::1

Example data object

{
  "origin": "originzone.com",
  "records": [
    {
      "name": "originzone.com",
      "ttl": 3600,
      "class": "IN",
      "type": "SOA",
      "content": "originzone.com. root.originzone.com. 2031242781 7200 3600 86400 3600",
      "comment": null
    },
    {
      "name": "originzone.com",
      "ttl": 60,
      "class": "IN",
      "type": "A",
      "content": "1.2.3.4",
      "comment": "a comment"
    },
    {
      "name": "mx",
      "ttl": 60,
      "class": "IN",
      "type": "A",
      "content": "1.2.3.4",
      "comment": "another comment"
    },
    {
      "name": "originzone.com",
      "ttl": 120,
      "class": "IN",
      "type": "AAAA",
      "content": "2001:db8::1",
      "comment": null
    },
    {
      "name": "mx",
      "ttl": 120,
      "class": "IN",
      "type": "AAAA",
      "content": "2001:db8::1",
      "comment": null
    }
  ]
}

License

© silverwind, distributed under BSD licence