tungstenite/
error.rs

1//! Error handling.
2
3use std::{io, result, str, string};
4
5use crate::protocol::{frame::coding::Data, Message};
6#[cfg(feature = "handshake")]
7use http::{header::HeaderName, Response};
8use thiserror::Error;
9
10/// Result type of all Tungstenite library calls.
11pub type Result<T, E = Error> = result::Result<T, E>;
12
13/// Possible WebSocket errors.
14#[derive(Error, Debug)]
15pub enum Error {
16    /// WebSocket connection closed normally. This informs you of the close.
17    /// It's not an error as such and nothing wrong happened.
18    ///
19    /// This is returned as soon as the close handshake is finished (we have both sent and
20    /// received a close frame) on the server end and as soon as the server has closed the
21    /// underlying connection if this endpoint is a client.
22    ///
23    /// Thus when you receive this, it is safe to drop the underlying connection.
24    ///
25    /// Receiving this error means that the WebSocket object is not usable anymore and the
26    /// only meaningful action with it is dropping it.
27    #[error("Connection closed normally")]
28    ConnectionClosed,
29    /// Trying to work with already closed connection.
30    ///
31    /// Trying to read or write after receiving `ConnectionClosed` causes this.
32    ///
33    /// As opposed to `ConnectionClosed`, this indicates your code tries to operate on the
34    /// connection when it really shouldn't anymore, so this really indicates a programmer
35    /// error on your part.
36    #[error("Trying to work with closed connection")]
37    AlreadyClosed,
38    /// Input-output error. Apart from WouldBlock, these are generally errors with the
39    /// underlying connection and you should probably consider them fatal.
40    #[error("IO error: {0}")]
41    Io(#[from] io::Error),
42    /// TLS error.
43    ///
44    /// Note that this error variant is enabled unconditionally even if no TLS feature is enabled,
45    /// to provide a feature-agnostic API surface.
46    #[error("TLS error: {0}")]
47    Tls(#[from] TlsError),
48    /// - When reading: buffer capacity exhausted.
49    /// - When writing: your message is bigger than the configured max message size
50    ///   (64MB by default).
51    #[error("Space limit exceeded: {0}")]
52    Capacity(#[from] CapacityError),
53    /// Protocol violation.
54    #[error("WebSocket protocol error: {0}")]
55    Protocol(#[from] ProtocolError),
56    /// Message write buffer is full.
57    #[error("Write buffer is full")]
58    WriteBufferFull(Message),
59    /// UTF coding error.
60    #[error("UTF-8 encoding error")]
61    Utf8,
62    /// Attack attempt detected.
63    #[error("Attack attempt detected")]
64    AttackAttempt,
65    /// Invalid URL.
66    #[error("URL error: {0}")]
67    Url(#[from] UrlError),
68    /// HTTP error.
69    #[error("HTTP error: {}", .0.status())]
70    #[cfg(feature = "handshake")]
71    Http(Response<Option<Vec<u8>>>),
72    /// HTTP format error.
73    #[error("HTTP format error: {0}")]
74    #[cfg(feature = "handshake")]
75    HttpFormat(#[from] http::Error),
76}
77
78impl From<str::Utf8Error> for Error {
79    fn from(_: str::Utf8Error) -> Self {
80        Error::Utf8
81    }
82}
83
84impl From<string::FromUtf8Error> for Error {
85    fn from(_: string::FromUtf8Error) -> Self {
86        Error::Utf8
87    }
88}
89
90#[cfg(feature = "handshake")]
91impl From<http::header::InvalidHeaderValue> for Error {
92    fn from(err: http::header::InvalidHeaderValue) -> Self {
93        Error::HttpFormat(err.into())
94    }
95}
96
97#[cfg(feature = "handshake")]
98impl From<http::header::InvalidHeaderName> for Error {
99    fn from(err: http::header::InvalidHeaderName) -> Self {
100        Error::HttpFormat(err.into())
101    }
102}
103
104#[cfg(feature = "handshake")]
105impl From<http::header::ToStrError> for Error {
106    fn from(_: http::header::ToStrError) -> Self {
107        Error::Utf8
108    }
109}
110
111#[cfg(feature = "handshake")]
112impl From<http::uri::InvalidUri> for Error {
113    fn from(err: http::uri::InvalidUri) -> Self {
114        Error::HttpFormat(err.into())
115    }
116}
117
118#[cfg(feature = "handshake")]
119impl From<http::status::InvalidStatusCode> for Error {
120    fn from(err: http::status::InvalidStatusCode) -> Self {
121        Error::HttpFormat(err.into())
122    }
123}
124
125#[cfg(feature = "handshake")]
126impl From<httparse::Error> for Error {
127    fn from(err: httparse::Error) -> Self {
128        match err {
129            httparse::Error::TooManyHeaders => Error::Capacity(CapacityError::TooManyHeaders),
130            e => Error::Protocol(ProtocolError::HttparseError(e)),
131        }
132    }
133}
134
135/// Indicates the specific type/cause of a capacity error.
136#[derive(Error, Debug, PartialEq, Eq, Clone, Copy)]
137pub enum CapacityError {
138    /// Too many headers provided (see [`httparse::Error::TooManyHeaders`]).
139    #[error("Too many headers")]
140    TooManyHeaders,
141    /// Received header is too long.
142    /// Message is bigger than the maximum allowed size.
143    #[error("Message too long: {size} > {max_size}")]
144    MessageTooLong {
145        /// The size of the message.
146        size: usize,
147        /// The maximum allowed message size.
148        max_size: usize,
149    },
150}
151
152/// Indicates the specific type/cause of a protocol error.
153#[allow(missing_copy_implementations)]
154#[derive(Error, Debug, PartialEq, Eq, Clone)]
155pub enum ProtocolError {
156    /// Use of the wrong HTTP method (the WebSocket protocol requires the GET method be used).
157    #[error("Unsupported HTTP method used - only GET is allowed")]
158    WrongHttpMethod,
159    /// Wrong HTTP version used (the WebSocket protocol requires version 1.1 or higher).
160    #[error("HTTP version must be 1.1 or higher")]
161    WrongHttpVersion,
162    /// Missing `Connection: upgrade` HTTP header.
163    #[error("No \"Connection: upgrade\" header")]
164    MissingConnectionUpgradeHeader,
165    /// Missing `Upgrade: websocket` HTTP header.
166    #[error("No \"Upgrade: websocket\" header")]
167    MissingUpgradeWebSocketHeader,
168    /// Missing `Sec-WebSocket-Version: 13` HTTP header.
169    #[error("No \"Sec-WebSocket-Version: 13\" header")]
170    MissingSecWebSocketVersionHeader,
171    /// Missing `Sec-WebSocket-Key` HTTP header.
172    #[error("No \"Sec-WebSocket-Key\" header")]
173    MissingSecWebSocketKey,
174    /// The `Sec-WebSocket-Accept` header is either not present or does not specify the correct key value.
175    #[error("Key mismatch in \"Sec-WebSocket-Accept\" header")]
176    SecWebSocketAcceptKeyMismatch,
177    /// Garbage data encountered after client request.
178    #[error("Junk after client request")]
179    JunkAfterRequest,
180    /// Custom responses must be unsuccessful.
181    #[error("Custom response must not be successful")]
182    CustomResponseSuccessful,
183    /// Invalid header is passed. Or the header is missing in the request. Or not present at all. Check the request that you pass.
184    #[error("Missing, duplicated or incorrect header {0}")]
185    #[cfg(feature = "handshake")]
186    InvalidHeader(HeaderName),
187    /// No more data while still performing handshake.
188    #[error("Handshake not finished")]
189    HandshakeIncomplete,
190    /// Wrapper around a [`httparse::Error`] value.
191    #[error("httparse error: {0}")]
192    #[cfg(feature = "handshake")]
193    HttparseError(#[from] httparse::Error),
194    /// Not allowed to send after having sent a closing frame.
195    #[error("Sending after closing is not allowed")]
196    SendAfterClosing,
197    /// Remote sent data after sending a closing frame.
198    #[error("Remote sent after having closed")]
199    ReceivedAfterClosing,
200    /// Reserved bits in frame header are non-zero.
201    #[error("Reserved bits are non-zero")]
202    NonZeroReservedBits,
203    /// The server must close the connection when an unmasked frame is received.
204    #[error("Received an unmasked frame from client")]
205    UnmaskedFrameFromClient,
206    /// The client must close the connection when a masked frame is received.
207    #[error("Received a masked frame from server")]
208    MaskedFrameFromServer,
209    /// Control frames must not be fragmented.
210    #[error("Fragmented control frame")]
211    FragmentedControlFrame,
212    /// Control frames must have a payload of 125 bytes or less.
213    #[error("Control frame too big (payload must be 125 bytes or less)")]
214    ControlFrameTooBig,
215    /// Type of control frame not recognised.
216    #[error("Unknown control frame type: {0}")]
217    UnknownControlFrameType(u8),
218    /// Type of data frame not recognised.
219    #[error("Unknown data frame type: {0}")]
220    UnknownDataFrameType(u8),
221    /// Received a continue frame despite there being nothing to continue.
222    #[error("Continue frame but nothing to continue")]
223    UnexpectedContinueFrame,
224    /// Received data while waiting for more fragments.
225    #[error("While waiting for more fragments received: {0}")]
226    ExpectedFragment(Data),
227    /// Connection closed without performing the closing handshake.
228    #[error("Connection reset without closing handshake")]
229    ResetWithoutClosingHandshake,
230    /// Encountered an invalid opcode.
231    #[error("Encountered invalid opcode: {0}")]
232    InvalidOpcode(u8),
233    /// The payload for the closing frame is invalid.
234    #[error("Invalid close sequence")]
235    InvalidCloseSequence,
236}
237
238/// Indicates the specific type/cause of URL error.
239#[derive(Error, Debug, PartialEq, Eq)]
240pub enum UrlError {
241    /// TLS is used despite not being compiled with the TLS feature enabled.
242    #[error("TLS support not compiled in")]
243    TlsFeatureNotEnabled,
244    /// The URL does not include a host name.
245    #[error("No host name in the URL")]
246    NoHostName,
247    /// Failed to connect with this URL.
248    #[error("Unable to connect to {0}")]
249    UnableToConnect(String),
250    /// Unsupported URL scheme used (only `ws://` or `wss://` may be used).
251    #[error("URL scheme not supported")]
252    UnsupportedUrlScheme,
253    /// The URL host name, though included, is empty.
254    #[error("URL contains empty host name")]
255    EmptyHostName,
256    /// The URL does not include a path/query.
257    #[error("No path/query in URL")]
258    NoPathOrQuery,
259}
260
261/// TLS errors.
262///
263/// Note that even if you enable only the rustls-based TLS support, the error at runtime could still
264/// be `Native`, as another crate in the dependency graph may enable native TLS support.
265#[allow(missing_copy_implementations)]
266#[derive(Error, Debug)]
267#[non_exhaustive]
268pub enum TlsError {
269    /// Native TLS error.
270    #[cfg(feature = "native-tls")]
271    #[error("native-tls error: {0}")]
272    Native(#[from] native_tls_crate::Error),
273    /// Rustls error.
274    #[cfg(feature = "__rustls-tls")]
275    #[error("rustls error: {0}")]
276    Rustls(#[from] rustls::Error),
277    /// DNS name resolution error.
278    #[cfg(feature = "__rustls-tls")]
279    #[error("Invalid DNS name")]
280    InvalidDnsName,
281}
tungstenite/error.rs

tungstenite/
error.rs
