# stun

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Session Traversal Utilities for NAT (STUN) server. Implements RFCs [8489](https://tools.ietf.org/html/rfc8489), [7064](https://tools.ietf.org/html/rfc7064), [5389](https://tools.ietf.org/html/rfc5389) and with partial support for [5766](https://tools.ietf.org/html/rfc5766), [5245](https://tools.ietf.org/html/rfc5245), and [5780](https://tools.ietf.org/html/rfc5780).

## Install

```
npm i stun
```

## Usage

```js
const stun = require('stun');

const res = await stun.request('stun.l.google.com:19302');
console.log('your ip', res.getXorAddress().address);
```

## CLI

```bash
$ npm i -g stun
$ stun # started on udp/0.0.0.0:3478
```

## API

- [`createMessage(type: number [, transaction: Buffer]): StunRequest`](#create-message)
- [`createTransaction(): Buffer`](#create-transaction)
- [`createServer(options: Object): StunServer`](#create-server)
- [`validateFingerprint(message: StunMessage): bool`](#validate-fingerprint)
- [`validateMessageIntegrity(message: StunMessage, key: string): bool`](#validate-message-integrity)
- [`request(url: string, [options: RequestOptions]): Promise<StunResponse>`](#request)
- [`encode(message: StunMessage): Buffer`](#encode)
- [`decode(message: Buffer): StunResponse`](#decode)
- [`class StunRequest`](#class-stun-request)
  - [`setType(type)`](#class-stun-message-set-type)
  - [`setTransactionId(transaction: Buffer): bool`](#class-stun-message-set-transaction-id)
  - [`addAttribute(type, address: string, port: number)`](#class-stun-message-add-attribute-address)
  - [`addAttribute(type, value: String|Buffer[, encoding: string = 'utf8'])`](#class-stun-message-add-attribute-string)
  - [`addAttribute(type, value: number)`](#class-stun-message-add-attribute-number)
  - [`addAttribute(type, value: array<number>)`](#class-stun-message-add-attribute-array)
  - [`addAttribute(type, code: number, reason: string)`](#class-stun-message-add-attribute-error)
  - [`addAddress(ip: string, port: number): StunAddressAttribute`](#class-stun-message-add-address)
  - [`addAlternateServer(ip: string, port: number): StunAddressAttribute`](#class-stun-message-add-alternate-server)
  - [`addXorAddress(ip: string, port: number): StunXorAddressAttribute`](#class-stun-message-add-xor-address)
  - [`addUsername(username: string): StunByteStringAttribute`](#class-stun-message-add-username)
  - [`addRealm(realm: string): StunByteStringAttribute`](#class-stun-message-add-realm)
  - [`addNonce(nonce: string): StunByteStringAttribute`](#class-stun-message-add-nonce)
  - [`addSoftware(software: string): StunByteStringAttribute`](#class-stun-message-add-software)
  - [`addUnknownAttributes(attributes: number[]): StunUInt16ListAttribute`](#class-stun-message-add-unknown-attributes)
  - [`addError(code: number, reason: string): StunErrorCodeAttribute`](#class-stun-message-add-error)
  - [`addPriority(priority: number): StunUInt32Attribute`](#class-stun-message-add-priority)
  - [`addUseCandidate(): StunByteStringAttribute`](#class-stun-message-add-use-candidate)
  - [`addIceControlled(tiebreaker: Buffer): StunByteStringAttribute`](#class-stun-message-add-ice-controlled)
  - [`addIceControlling(tiebreaker: Buffer): StunByteStringAttribute`](#class-stun-message-add-ice-controlling)
  - [`removeAttribute(type): bool`](#class-stun-message-remove-attribute)
  - [`addMessageIntegrity(key: string)`](#class-stun-message-add-message-integrity)
  - [`addFingerprint()`](#class-stun-message-add-fingerprint)
  - [`toBuffer(): Buffer`](#class-stun-message-to-buffer)
- [`class StunResponse`](#class-stun-response)
  - [`getAddress(): Object`](#class-stun-response-get-address)
  - [`getXorAddress(): Object`](#class-stun-response-get-xor-address)
  - [`getAlternateServer(): Object`](#class-stun-response-get-alternate-server)
  - [`getUsername(): string`](#class-stun-response-get-username)
  - [`getError(): Object`](#class-stun-response-get-error)
  - [`getRealm(): string`](#class-stun-response-get-realm)
  - [`getNonce(): string`](#class-stun-response-get-nonce)
  - [`getSoftware(): string`](#class-stun-response-get-software)
  - [`getUnknownAttributes(): number[]`](#class-stun-response-get-unknown-attributes)
  - [`getMessageIntegrity(): Buffer`](#class-stun-response-get-message-integrity)
  - [`getFingerprint(): number`](#class-stun-response-get-fingerprint)
  - [`getPriority(): number`](#class-stun-response-get-priority)
  - [`getIceControlled(): Buffer`](#class-stun-response-get-ice-controlled)
  - [`getIceControlling(): Buffer`](#class-stun-response-get-ice-controlling)
- [`class StunMessage`](#class-stun-message)
  - [`get type`](#class-stun-message-get-type)
  - [`get transactionId`](#class-stun-message-get-type)
  - [`isLegacy(): bool`](#class-stun-message-is-legacy)
  - [`getAttribute(type): StunAttribute`](#class-stun-message-get-attribute)
  - [`hasAttribute(type): bool`](#class-stun-message-has-attribute)
  - [`get count: number`](#class-stun-message-get-count)
- [`class StunServer`](#class-stun-server)
  - [`new StunServer(socket: dgram.Socket)`](#class-stun-server-new)
  - [`send(message: StunMessage, port: number, address: string[, cb: function])`](#class-stun-server-send)
  - [`close()`](#class-stun-server-close)
  - [`listen(port: number, [address: string], [callback: function()])`](#class-stun-server-listen)
  - [`Event: bindingRequest`](#class-stun-server-event-binding-request)
  - [`Event: bindingIndication`](#class-stun-server-event-binding-indication)
  - [`Event: bindingResponse`](#class-stun-server-event-binding-response)
  - [`Event: bindingError`](#class-stun-server-event-binding-error)
  - [`Event: close`](#class-stun-server-event-close)
  - [`Event: error`](#class-stun-server-event-error)
  - [`Event: listening`](#class-stun-server-event-listening)
- [`class StunAttribute`](#class-stun-attribute)
  - [`get type`](#class-stun-attribute-get-type)
  - [`get value`](#class-stun-attribute-get-value)
- [`constants: Object`](#constants)
- [`class StunError`](#class-stun-error)
- [`class StunMessageError`](#class-stun-message-error)
- [`class StunResponseError`](#class-stun-response-error)

<a name="create-message" />

#### `createMessage(type: number [, transaction: Buffer]): StunRequest`

Creates an `StunRequest` object of the specified `type` with random `transaction` field. The `type` argument is a number that should be a message type. See `constants` below.

<a name="create-transaction" />

#### `createTransaction(): Buffer`

Create transaction id for STUN message. Follow [RFC5389](https://tools.ietf.org/html/rfc5389).

<a name="create-server" />

#### `createServer(options: Object): StunServer`

- `options.type: string`

The type of socket. Must be 'udp4' or 'udp6'. Required.

- `options.socket: dgram.Socket`

Creates a `StunServer` object of the specified type. The `type` argument should be 'udp' at the moment. An optional `socket` argument should be instance of `dgram.Socket`. If `socket` is not specified, the `dgram.Socket` will be created with `udp4` type and will bound to the "all interfaces" address on a random port.

<a name="validate-fingerprint" />

#### `validateFingerprint(message: StunMessage): bool`

Check a `FINGERPRINT` attribute if it is specified.

<a name="validate-message-integrity" />

#### `validateMessageIntegrity(message: StunMessage, key: string): bool`

Check a `MESSAGE_INTEGRITY` attribute if it is specified.

```js
stunServer.on('bindingResponse', (msg) => {
  if (!stun.validateFingerprint(msg)) {
    // do stuff..
  }

  if (!stun.validateMessageIntegrity(msg, icePassword)) {
    // do stuff...
  }
});
```

<a name="request" />

#### `request(url: string, [options: RequestOptions]): Promise<StunResponse>`

Create a request `STUN_BINDING_REQUEST` to stun server, follow [RFC5389](https://tools.ietf.org/html/rfc5389). The first argument may be a host (`stun.example.com`), host with port (`stun.example.com:1234`) or host with port and protocol (`stun://stun.example.com:1234`). By default, port is 3478. For `stuns://` URLs, the default port is 5349 and the request is sent over TLS-over-TCP per [RFC 7064](https://tools.ietf.org/html/rfc7064).

All options described below are optional.

- `options.server: StunServer` - A stun server to receive responses.
- `options.socket: dgram.Socket` - A UDP socket over which the message will be send.
- `options.message: StunMessage` - A `STUN_BINDING_REQUEST` message to send.
- `options.timeout: number` - Initial retransmission timeout (_RTO_) in ms, default is 500ms.
- `options.maxTimeout: number`- Maximal RTO, default is infinity.
- `options.retries: number` - Maximal the number of retries, default is 6

Resolves with a `StunResponse`. Rejects with an `Error` (`'timeout'` after the final retry, or a STUN/socket error).

<a name="encode" />

#### `encode(message: StunMessage): Buffer`

Encode `StunRequest` or `StunResponse` into the Buffer.

<a name="decode" />

#### `decode(message: Buffer): StunResponse`

Decode the Buffer into a `StunResponse`.

```js
const socket = dgram.createSocket({ type: 'udp4' });

socket.on('message', (message) => {
  const response = stun.decode(message);
  // do stuff ...
});
```

<a name="class-stun-message" />

#### `class StunMessage`

The `StunMessage` class is an utility that encapsulates the `STUN` protocol. This is a base class for `StunRequest` and `StunResponse`.

<a name="class-stun-message-get-type" />

- **get `type`**
- **get `transactionId`**

Returns the `type` and `transactionId` fields from the current message.

<a name="class-stun-message-is-legacy" />

- **`isLegacy(): bool`**

Returns true if the message confirms to RFC3489 rather than RFC5389.

<a name="class-stun-message-get-attribute" />

- **`getAttribute(type): StunAttribute`**

Returns the `StunAttribute` attribute of the specified `type`. The `type` argument is a number that should be an attribute type. See `constants` below. Return `undefined` if attribute is not exist.

**N.B.** This method return only first matched attribute. If you want to get another one, try this:

```js
const attributes = Array.from(stunMessage).filter(
  (attribute) => attribute.type === STUN_ATTR_MAPPED_ADDRESS,
);
```

<a name="class-stun-message-get-count" />

- **get `count: number`**

Returns the number of an attributes in the current message.

<a name="class-stun-request" />

#### `class StunRequest`

The `StunRequest` encapsulates outgoing messages of the `STUN` protocol. Instances of the `StunRequest` can be created using the `createMessage()`.

<a name="class-stun-message-set-type" />

- **`setType(type)`**

Set the type of the message. The `type` argument is a number that should be a message type. See `constants` below.

<a name="class-stun-message-set-transaction-id" />

- **`setTransactionId(transaction: Buffer): bool`**

Set the transaction id of the message. The `transaction` argument should be a `Buffer` and have length 12 bytes.

<a name="class-stun-message-add-attribute-address" />

- **`addAttribute(type, address: string, port: number)`**

Adds a `type` attribute to the current message. The `type` argument should be one of:

- `STUN_ATTR_MAPPED_ADDRESS`
- `STUN_ATTR_ALTERNATE_SERVER`
- `STUN_ATTR_XOR_MAPPED_ADDRESS`
- `STUN_ATTR_RESPONSE_ORIGIN`
- `STUN_ATTR_OTHER_ADDRESS`
- `STUN_ATTR_XOR_PEER_ADDRESS`
- `STUN_ATTR_XOR_RELAYED_ADDRESS`.

```js
stunMsg.addAttribute(STUN_ATTR_XOR_MAPPED_ADDRESS, '8.8.8.8', 19302);
```

<a name="class-stun-message-add-attribute-string" />

- **`addAttribute(type, value: String|Buffer[, encoding: string = 'utf8'])`**

Adds a `type` attribute to the current message. The `type` argument should be one of:

- `STUN_ATTR_USERNAME`
- `STUN_ATTR_REALM`
- `STUN_ATTR_NONCE`
- `STUN_ATTR_SOFTWARE`
- `STUN_ATTR_ORIGIN`
- `STUN_ATTR_USE_CANDIDATE`
- `STUN_ATTR_ICE_CONTROLLED`
- `STUN_ATTR_ICE_CONTROLLING`
- `STUN_ATTR_DATA`
- `STUN_ATTR_EVEN_PORT`
- `STUN_ATTR_RESERVATION_TOKEN`
- `STUN_ATTR_DONT_FRAGMENT`
- `STUN_ATTR_PADDING`.

```js
stunMsg.addAttribute(STUN_ATTR_SOFTWARE, 'node/8.2.0 stun/1.0.0');
```

<a name="class-stun-message-add-attribute-number" />

- **`addAttribute(type, value: number)`**

Adds a `type` attribute to the current message. The `type` argument should be one of:

- `STUN_ATTR_RETRANSMIT_COUNT`
- `STUN_ATTR_PRIORITY`
- `STUN_ATTR_NETWORK_INFO`
- `STUN_ATTR_NOMINATION`
- `STUN_ATTR_CHANNEL_NUMBER`
- `STUN_ATTR_LIFETIME`
- `STUN_ATTR_REQUESTED_TRANSPORT`
- `STUN_ATTR_CHANGE_REQUEST`
- `STUN_ATTR_RESPONSE_PORT`.

```js
stunMsg.addAttribute(STUN_ATTR_PRIORITY, 123);
```

<a name="class-stun-message-add-attribute-array" />

- **`addAttribute(type, value: array<number>)`**

Adds a `type` attribute to the current message. The `type` argument should be `STUN_ATTR_UNKNOWN_ATTRIBUTES`.

```js
stunMsg.addAttribute(STUN_ATTR_UNKNOWN_ATTRIBUTES, [2, 3, 4]);
```

<a name="class-stun-message-add-attribute-error" />

- **`addAttribute(type, code: number, reason: string)`**

Adds a `type` attribute to the current message. The `type` argument should be `STUN_ATTR_ERROR_CODE`.

```js
stunMsg.addAttribute(
  STUN_ATTR_ERROR_CODE,
  STUN_CODE_UNAUTHORIZED,
  STUN_REASON_UNAUTHORIZED,
);
```

<a name="class-stun-message-add-address" />

- **`addAddress(ip: string, port: number): StunAddressAttribute`**

Adds a `MAPPED-ADDRESS` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.1)

<a name="class-stun-message-add-alternate-server" />

- **`addAlternateServer(ip: string, port: number): StunAddressAttribute`**

Adds a `ALTERNATE-SERVER` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.11)

<a name="class-stun-message-add-xor-address" />

- **`addXorAddress(ip: string, port: number): StunXorAddressAttribute`**

Adds a `XOR-MAPPED-ADDRESS` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.2)

<a name="class-stun-message-add-username" />

- **`addUsername(username: string): StunByteStringAttribute`**

Adds a `USERNAME` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.3)

<a name="class-stun-message-add-realm" />

- **`addRealm(realm: string): StunByteStringAttribute`**

Adds a `REALM` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.7)

<a name="class-stun-message-add-nonce" />

- **`addNonce(nonce: string): StunByteStringAttribute`**

Adds a `NONCE` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.8)

<a name="class-stun-message-add-software" />

- **`addSoftware(software: string): StunByteStringAttribute`**

Adds a `SOFTWARE` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.10)

<a name="class-stun-message-add-unknown-attributes" />

- **`addUnknownAttributes(attributes: number[]): StunUInt16ListAttribute`**

Adds a `UNKNOWN-ATTRIBUTES` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.9)

<a name="class-stun-message-add-error" />

- **`addError(code: number, reason: string): StunErrorCodeAttribute`**

Adds a `ERROR-CODE` attribute to the message.

See [RFC5389](https://tools.ietf.org/html/rfc5389#section-15.6)

<a name="class-stun-message-add-priority" />

- **`addPriority(priority: number): StunUInt32Attribute`**

Adds a `PRIORITY` attribute to the message.

See [RFC8445](https://tools.ietf.org/html/rfc8445#section-16.1)

<a name="class-stun-message-add-use-candidate" />

- **`addUseCandidate(): StunByteStringAttribute`**

Adds a `USE-CANDIDATE` attribute to the message.

See [RFC8445](https://tools.ietf.org/html/rfc8445#section-16.1)

<a name="class-stun-message-add-ice-controlled" />

- **`addIceControlled(tiebreaker: Buffer): StunByteStringAttribute`**

Adds a `ICE-CONTROLLED` attribute to the message.

See [RFC8445](https://tools.ietf.org/html/rfc8445#section-16.1)

<a name="class-stun-message-add-ice-controlling" />

- **`addIceControlling(tiebreaker: Buffer): StunByteStringAttribute`**

Adds a `ICE-CONTROLLING` attribute to the message.

See [RFC8445](https://tools.ietf.org/html/rfc8445#section-16.1)

<a name="class-stun-message-remove-attribute" />

- **`removeAttribute(type): bool`**

Remove a `type` attribute from the current message. Returns true if an attribute was removed. The `type` argument is a number that should be an attribute type. See `constants` below.

<a name="class-stun-message-add-message-integrity" />

- **`addMessageIntegrity(key: string)`**

Adds a `MESSAGE-INTEGRITY` attribute that is valid for the current message. The `key` is the HMAC key used to generate the cryptographic HMAC hash.

<a name="class-stun-message-add-fingerprint" />

- **`addFingerprint()`**

Adds a `FINGERPRINT` attribute that is valid for the current message.

<a name="class-stun-message-to-buffer" />

- **`toBuffer(): Buffer`**

Converts a `StunMessage` object to the buffer.

<a name="class-stun-server" />

#### `class StunServer`

The `StunServer` class is an EventEmitter that encapsulates a STUN server.

<a name="class-stun-server-new" />

- **`new StunServer(socket: dgram.Socket)`**

Creates a new `StunServer` object. The `socket` argument should be an instance of `dgram.Socket`. The incoming message is silently ignored when it is not a `stun` one.

<a name="class-stun-server-send" />

- **`send(message: StunMessage, port: number, address: string[, cb: function])`**

Sends the `StunMessage` message on the socket. The destination `port` and `address` must be specified. An optional `callback` function will be called when the message has been sent.

<a name="class-stun-server-close" />

- **`close()`**

Stops the processing of the incoming messages and emits `close` event.

<a name="class-stun-server-listen" />

- **`listen(port: number, [address: string], [callback: function()])`**

Attempt to listen for messages on a named `port` and optional `address`. For UDP servers calls [`socket.bind`](https://nodejs.org/dist/latest-v10.x/docs/api/dgram.html#dgram_socket_bind_port_address_callback) under the hood.

<a name="class-stun-server-event-binding-request" />

- **Event: `bindingRequest`**

Emitted when the `STUN_BINDING_REQUEST` message is available on a socket.

<a name="class-stun-server-event-binding-indication" />

- **Event: `bindingIndication`**

Emitted when the `STUN_BINDING_INDICATION` message is available on a socket.

<a name="class-stun-server-event-binding-response" />

- **Event: `bindingResponse`**

Emitted when the `STUN_BINDING_RESPONSE` message is available on a socket.

<a name="class-stun-server-event-binding-error" />

- **Event: `bindingError`**

Emitted when the `STUN_BINDING_ERROR_RESPONSE` message is available on a socket.

<a name="class-stun-server-event-close" />

- **Event: `close`**

Emitted when the server closes.

<a name="class-stun-server-event-error" />

- **Event: `error`**

Emitted when the server got an invalid message.

<a name="class-stun-server-event-listening" />

- **Event: `listening`**

The `'listening'` event is emitted whenever a socket begins listening for messages.

<a name="class-stun-attribute" />

#### **`class StunAttribute`**

The `StunAttribute` class is an utility for adding an attributes to the `StunMessage` message.

<a name="class-stun-attribute-get-type" />

- **get `type`**

Returns the attribute type. See `constants` below.

<a name="class-stun-attribute-get-value" />

- **get `value`**

Returns the value of the attribute. It depends on the value type of the attribute.

```js
stunMsg.getAttribute(STUN_ATTR_USERNAME).value; // string
stunMsg.getAttribute(STUN_ATTR_PRIORITY).value; // number
stunMsg.getAttribute(STUN_ATTR_MAPPED_ADDRESS).value; // object
```

<a name="constants" />

#### **`constants: object`**

These are the types of STUN messages defined in [RFC5389](https://tools.ietf.org/html/rfc5389):

- `STUN_BINDING_REQUEST`
- `STUN_BINDING_INDICATION`
- `STUN_BINDING_RESPONSE`
- `STUN_BINDING_ERROR_RESPONSE`

These are the event names for STUN messages above:

- `STUN_EVENT_BINDING_REQUEST`
- `STUN_EVENT_BINDING_INDICATION`
- `STUN_EVENT_BINDING_RESPONSE`
- `STUN_EVENT_BINDING_ERROR_RESPONSE`

These are the types of STUN messages defined in [RFC5766](https://tools.ietf.org/html/rfc5766):

- `STUN_ALLOCATE_REQUEST`
- `STUN_ALLOCATE_RESPONSE`
- `STUN_ALLOCATE_ERROR_RESPONSE`
- `STUN_REFRESH_REQUEST`
- `STUN_REFRESH_RESPONSE`
- `STUN_REFRESH_ERROR_RESPONSE`
- `STUN_SEND_INDICATION`
- `STUN_DATA_INDICATION`
- `STUN_CREATE_PERMISSION_REQUEST`
- `STUN_CREATE_PERMISSION_RESPONSE`
- `STUN_CREATE_PERMISSION_ERROR_RESPONSE`
- `STUN_CHANNEL_BIND_REQUEST`
- `STUN_CHANNEL_BIND_RESPONSE`
- `STUN_CHANNEL_BIND_ERROR_RESPONSE`

Thsese are all known STUN attributes, defined in [RFC5389](https://tools.ietf.org/html/rfc5389) and elsewhere:

- `STUN_ATTR_MAPPED_ADDRESS`
- `STUN_ATTR_USERNAME`
- `STUN_ATTR_MESSAGE_INTEGRITY`
- `STUN_ATTR_ERROR_CODE`
- `STUN_ATTR_UNKNOWN_ATTRIBUTES`
- `STUN_ATTR_REALM`
- `STUN_ATTR_NONCE`
- `STUN_ATTR_XOR_MAPPED_ADDRESS`
- `STUN_ATTR_SOFTWARE`
- `STUN_ATTR_ALTERNATE_SERVER`
- `STUN_ATTR_FINGERPRINT`
- `STUN_ATTR_ORIGIN`
- `STUN_ATTR_RETRANSMIT_COUNT`
- `STUN_ATTR_PRIORITY`
- `STUN_ATTR_USE_CANDIDATE`
- `STUN_ATTR_ICE_CONTROLLED`
- `STUN_ATTR_ICE_CONTROLLING`
- `STUN_ATTR_NOMINATION`
- `STUN_ATTR_NETWORK_INFO`
- `STUN_ATTR_CHANNEL_NUMBER`
- `STUN_ATTR_LIFETIME`
- `STUN_ATTR_XOR_PEER_ADDRESS`
- `STUN_ATTR_DATA`
- `STUN_ATTR_XOR_RELAYED_ADDRESS`
- `STUN_ATTR_EVEN_PORT`
- `STUN_ATTR_REQUESTED_TRANSPORT`
- `STUN_ATTR_DONT_FRAGMENT`
- `STUN_ATTR_RESERVATION_TOKEN`
- `STUN_ATTR_CHANGE_REQUEST`
- `STUN_ATTR_PADDING`
- `STUN_ATTR_RESPONSE_PORT`
- `STUN_ATTR_RESPONSE_ORIGIN`
- `STUN_ATTR_OTHER_ADDRESS`

These are the types of STUN error codes defined in [RFC5389](https://tools.ietf.org/html/rfc5389) and elsewhere:

- `STUN_CODE_TRY_ALTERNATE`
- `STUN_CODE_BAD_REQUEST`
- `STUN_CODE_UNAUTHORIZED`
- `STUN_CODE_UNKNOWN_ATTRIBUTE`
- `STUN_CODE_STALE_CREDENTIALS`
- `STUN_CODE_STALE_NONCE`
- `STUN_CODE_SERVER_ERROR`
- `STUN_CODE_GLOBAL_FAILURE`
- `STUN_CODE_ROLE_CONFLICT`
- `STUN_CODE_FORBIDDEN`
- `STUN_CODE_ALLOCATION_MISMATCH`
- `STUN_CODE_WRONG_CREDENTIALS`
- `STUN_CODE_UNSUPPORTED_PROTOCOL`
- `STUN_CODE_ALLOCATION_QUOTA`
- `STUN_CODE_INSUFFICIENT_CAPACITY`

These are the strings for the error codes above:

- `STUN_REASON_TRY_ALTERNATE`
- `STUN_REASON_BAD_REQUEST`
- `STUN_REASON_UNAUTHORIZED`
- `STUN_REASON_UNKNOWN_ATTRIBUTE`
- `STUN_REASON_STALE_CREDENTIALS`
- `STUN_REASON_STALE_NONCE`
- `STUN_REASON_SERVER_ERROR`
- `STUN_REASON_ROLE_CONFLICT`
- `STUN_REASON_FORBIDDEN`
- `STUN_REASON_ALLOCATION_MISMATCH`
- `STUN_REASON_WRONG_CREDENTIALS`
- `STUN_REASON_UNSUPPORTED_PROTOCOL`
- `STUN_REASON_ALLOCATION_QUOTA`
- `STUN_REASON_INSUFFICIENT_CAPACITY`

<a name="class-stun-error" />

#### **`class StunError`**

Base class for all generated errors.

- **get `packet: Buffer|StunMessage`**

Received data.

- **get `sender: object`**

For UDP, this is an `rinfo` attribute.

<a name="class-stun-message-error" />

#### **`class StunMessageError`**

The STUN server may receive invalid messages. This error class represent ones. Inherits from `StunError`.

- **get `packet: Buffer`**

See above.

<a name="class-stun-response-error" />

#### **`class StunResponseError`**

This class represent protocol level errors, for messages with class type `ERROR`. Inherits from `StunError`.

- **get `packet: StunMessage`**

See above.

## License

MIT

- 2017–2019 © Dmitry Tsvettsikh (original author, [reklatsmasters/stun](https://github.com/nodertc/stun))
- 2024–2026 © Matt Simerson (fork maintainer, [msimerson/stun](https://github.com/msimerson/stun))