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doc: Add documentation on resolveNaptr and naptr rrtype #6586

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doc: Add resolveNaptr and naptr rrtype docs 
Updates the dns module documentation to include documentation on
the resolveNaptr method, and also adds the option NAPTR to the
list of valid values for rrtype in dns.resolve(hostname[, rrtype],
callback)
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@doug-wade
doug-wade committed May 18, 2016
commit a75b4230d0d1a64444e5dc0e1dee750c09190686
28 changes: 28 additions & 0 deletions doc/api/dns.md
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Expand Up @@ -159,6 +159,7 @@ Valid values for `rrtype` are:
* `'NS'` - name server records
* `'CNAME'` - canonical name records
* `'SOA'` - start of authority record
* `'NAPTR'` - name authority pointer record

The `callback` function has arguments `(err, addresses)`. When successful,
`addresses` will be an array. The type of each item in `addresses` is
Expand Down Expand Up @@ -195,6 +196,33 @@ Uses the DNS protocol to resolve mail exchange records (`MX` records) for the
contain an array of objects containing both a `priority` and `exchange`
property (e.g. `[{priority: 10, exchange: 'mx.example.com'}, ...]`).

## dns.resolveNaptr(hostname, callback)

Uses the DNS protocol to resolve regular expression based records (`NAPTR`
records) for the `hostname`. The `callback` function has arguments
`(err, addresses)`. The `addresses` argument passed to the `callback` function
will contain an array of objects with the following properties:

* `flags`
* `service`
* `regexp`
* `replacement`
* `order`
* `preference`

For example:

```js
{
flags: 's',
service: 'SIP+D2U',
regexp: '',
replacement: '_sip._udp.example.com',
order: 30,
preference: 100
}
```

## dns.resolveNs(hostname, callback)

Uses the DNS protocol to resolve name server records (`NS` records) for the
Expand Down