Alexey Galakhov
8 years ago
committed by
Daniel Abramov
commit
087636c3ad
@ -1,75 +1,97 @@ |
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use std::net::{TcpStream, ToSocketAddrs}; |
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use url::{Url, SocketAddrs}; |
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use std::net::{TcpStream, SocketAddr, ToSocketAddrs}; |
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use std::result::Result as StdResult; |
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use std::io::{Read, Write}; |
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|
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use url::Url; |
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|
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#[cfg(feature="tls")] |
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use native_tls::{TlsStream, TlsConnector, HandshakeError as TlsHandshakeError}; |
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use protocol::WebSocket; |
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use handshake::{Handshake as HandshakeTrait, HandshakeResult}; |
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use handshake::HandshakeError; |
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use handshake::client::{ClientHandshake, Request}; |
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use stream::Mode; |
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use error::{Error, Result}; |
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|
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/// Connect to the given WebSocket.
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///
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/// Note that this function may block the current thread while DNS resolution is performed.
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pub fn connect(url: Url) -> Result<Handshake> { |
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let mode = match url.scheme() { |
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"ws" => Mode::Plain, |
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#[cfg(feature="tls")] |
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"wss" => Mode::Tls, |
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_ => return Err(Error::Url("URL scheme not supported".into())) |
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}; |
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use stream::Stream as StreamSwitcher; |
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|
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// Note that this function may block the current thread while resolution is performed.
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#[cfg(feature="tls")] |
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pub type AutoStream = StreamSwitcher<TcpStream, TlsStream<TcpStream>>; |
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#[cfg(not(feature="tls"))] |
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pub type AutoStream = TcpStream; |
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|
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/// Connect to the given WebSocket in blocking mode.
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///
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/// The URL may be either ws:// or wss://.
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/// To support wss:// URLs, feature "tls" must be turned on.
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pub fn connect(url: Url) -> Result<WebSocket<AutoStream>> { |
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let mode = url_mode(&url)?; |
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let addrs = url.to_socket_addrs()?; |
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Ok(Handshake { |
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state: HandshakeState::Nothing(url), |
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alt_addresses: addrs, |
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let stream = connect_to_some(addrs, &url, mode)?; |
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client(url.clone(), stream) |
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.map_err(|e| match e { |
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HandshakeError::Failure(f) => f, |
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HandshakeError::Interrupted(_) => panic!("Bug: blocking handshake not blocked"), |
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}) |
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} |
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|
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enum Mode { |
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Plain, |
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Tls, |
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#[cfg(feature="tls")] |
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fn wrap_stream(stream: TcpStream, domain: &str, mode: Mode) -> Result<AutoStream> { |
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match mode { |
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Mode::Plain => Ok(StreamSwitcher::Plain(stream)), |
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Mode::Tls => { |
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let connector = TlsConnector::builder()?.build()?; |
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connector.connect(domain, stream) |
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.map_err(|e| match e { |
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TlsHandshakeError::Failure(f) => f.into(), |
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TlsHandshakeError::Interrupted(_) => panic!("Bug: TLS handshake not blocked"), |
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}) |
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.map(|s| StreamSwitcher::Tls(s)) |
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} |
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} |
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|
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enum HandshakeState { |
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Nothing(Url), |
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WebSocket(ClientHandshake<TcpStream>), |
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} |
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|
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pub struct Handshake { |
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state: HandshakeState, |
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alt_addresses: SocketAddrs, |
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#[cfg(not(feature="tls"))] |
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fn wrap_stream(stream: TcpStream, _domain: &str, mode: Mode) -> Result<AutoStream> { |
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match mode { |
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Mode::Plain => Ok(stream), |
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Mode::Tls => Err(Error::Url("TLS support not compiled in.".into())), |
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} |
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} |
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|
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impl HandshakeTrait for Handshake { |
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type Stream = WebSocket<TcpStream>; |
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fn handshake(mut self) -> Result<HandshakeResult<Self>> { |
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match self.state { |
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HandshakeState::Nothing(url) => { |
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if let Some(addr) = self.alt_addresses.next() { |
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fn connect_to_some<A>(addrs: A, url: &Url, mode: Mode) -> Result<AutoStream> |
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where A: Iterator<Item=SocketAddr> |
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{ |
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let domain = url.host_str().ok_or(Error::Url("No host name in the URL".into()))?; |
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for addr in addrs { |
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debug!("Trying to contact {} at {}...", url, addr); |
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let state = { |
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if let Ok(stream) = TcpStream::connect(addr) { |
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let hs = ClientHandshake::new(stream, Request { url: url }); |
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HandshakeState::WebSocket(hs) |
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} else { |
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HandshakeState::Nothing(url) |
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if let Ok(raw_stream) = TcpStream::connect(addr) { |
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if let Ok(stream) = wrap_stream(raw_stream, domain, mode) { |
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return Ok(stream) |
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} |
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}; |
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Ok(HandshakeResult::Incomplete(Handshake { |
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state: state, |
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..self |
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})) |
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} else { |
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Err(Error::Url(format!("Unable to resolve {}", url).into())) |
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} |
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} |
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HandshakeState::WebSocket(ws) => { |
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let alt_addresses = self.alt_addresses; |
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ws.handshake().map(move |r| r.map(move |s| Handshake { |
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state: HandshakeState::WebSocket(s), |
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alt_addresses: alt_addresses, |
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})) |
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Err(Error::Url(format!("Unable to connect to {}", url).into())) |
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} |
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|
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/// Get the mode of the given URL.
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///
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/// This function may be used in non-blocking implementations.
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pub fn url_mode(url: &Url) -> Result<Mode> { |
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match url.scheme() { |
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"ws" => Ok(Mode::Plain), |
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"wss" => Ok(Mode::Tls), |
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_ => Err(Error::Url("URL scheme not supported".into())) |
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} |
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} |
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|
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/// Do the client handshake over the given stream.
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///
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/// Use this function if you need a nonblocking handshake support.
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pub fn client<Stream: Read + Write>(url: Url, stream: Stream) |
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-> StdResult<WebSocket<Stream>, HandshakeError<Stream, ClientHandshake>> |
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{ |
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let request = Request { url: url }; |
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ClientHandshake::start(stream, request).handshake() |
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} |
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@ -0,0 +1,145 @@ |
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use std::ascii::AsciiExt; |
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use std::str::from_utf8; |
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use std::slice; |
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use httparse; |
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use httparse::Status; |
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use error::Result; |
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use super::machine::TryParse; |
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// Limit the number of header lines.
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pub const MAX_HEADERS: usize = 124; |
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/// HTTP request or response headers.
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#[derive(Debug)] |
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pub struct Headers { |
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data: Vec<(String, Box<[u8]>)>, |
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} |
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impl Headers { |
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/// Get first header with the given name, if any.
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pub fn find_first(&self, name: &str) -> Option<&[u8]> { |
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self.find(name).next() |
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} |
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/// Iterate over all headers with the given name.
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pub fn find<'headers, 'name>(&'headers self, name: &'name str) -> HeadersIter<'name, 'headers> { |
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HeadersIter { |
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name: name, |
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iter: self.data.iter() |
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} |
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} |
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/// Check if the given header has the given value.
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pub fn header_is(&self, name: &str, value: &str) -> bool { |
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self.find_first(name) |
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.map(|v| v == value.as_bytes()) |
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.unwrap_or(false) |
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} |
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/// Check if the given header has the given value (case-insensitive).
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pub fn header_is_ignore_case(&self, name: &str, value: &str) -> bool { |
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self.find_first(name).ok_or(()) |
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.and_then(|val_raw| from_utf8(val_raw).map_err(|_| ())) |
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.map(|val| val.eq_ignore_ascii_case(value)) |
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.unwrap_or(false) |
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} |
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} |
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|
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/// The iterator over headers.
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pub struct HeadersIter<'name, 'headers> { |
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name: &'name str, |
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iter: slice::Iter<'headers, (String, Box<[u8]>)>, |
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} |
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impl<'name, 'headers> Iterator for HeadersIter<'name, 'headers> { |
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type Item = &'headers [u8]; |
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fn next(&mut self) -> Option<Self::Item> { |
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while let Some(&(ref name, ref value)) = self.iter.next() { |
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if name.eq_ignore_ascii_case(self.name) { |
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return Some(value) |
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} |
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} |
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None |
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} |
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} |
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/// Trait to convert raw objects into HTTP parseables.
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pub trait FromHttparse<T>: Sized { |
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fn from_httparse(raw: T) -> Result<Self>; |
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} |
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impl TryParse for Headers { |
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fn try_parse(buf: &[u8]) -> Result<Option<(usize, Self)>> { |
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let mut hbuffer = [httparse::EMPTY_HEADER; MAX_HEADERS]; |
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Ok(match httparse::parse_headers(buf, &mut hbuffer)? { |
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Status::Partial => None, |
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Status::Complete((size, hdr)) => Some((size, Headers::from_httparse(hdr)?)), |
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}) |
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} |
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} |
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impl<'b: 'h, 'h> FromHttparse<&'b [httparse::Header<'h>]> for Headers { |
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fn from_httparse(raw: &'b [httparse::Header<'h>]) -> Result<Self> { |
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Ok(Headers { |
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data: raw.iter() |
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.map(|h| (h.name.into(), Vec::from(h.value).into_boxed_slice())) |
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.collect(), |
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}) |
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} |
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} |
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#[cfg(test)] |
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mod tests { |
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use super::Headers; |
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use super::super::machine::TryParse; |
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#[test] |
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fn headers() { |
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const data: &'static [u8] = |
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b"Host: foo.com\r\n\ |
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Connection: Upgrade\r\n\ |
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Upgrade: websocket\r\n\ |
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\r\n"; |
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let (_, hdr) = Headers::try_parse(data).unwrap().unwrap(); |
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assert_eq!(hdr.find_first("Host"), Some(&b"foo.com"[..])); |
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assert_eq!(hdr.find_first("Upgrade"), Some(&b"websocket"[..])); |
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assert_eq!(hdr.find_first("Connection"), Some(&b"Upgrade"[..])); |
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assert!(hdr.header_is("upgrade", "websocket")); |
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assert!(!hdr.header_is("upgrade", "Websocket")); |
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assert!(hdr.header_is_ignore_case("upgrade", "Websocket")); |
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} |
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#[test] |
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fn headers_iter() { |
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const data: &'static [u8] = |
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b"Host: foo.com\r\n\ |
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Sec-WebSocket-Extensions: permessage-deflate\r\n\ |
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Connection: Upgrade\r\n\ |
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Sec-WebSocket-ExtenSIONS: permessage-unknown\r\n\ |
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Upgrade: websocket\r\n\ |
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\r\n"; |
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let (_, hdr) = Headers::try_parse(data).unwrap().unwrap(); |
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let mut iter = hdr.find("Sec-WebSocket-Extensions"); |
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assert_eq!(iter.next(), Some(&b"permessage-deflate"[..])); |
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assert_eq!(iter.next(), Some(&b"permessage-unknown"[..])); |
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assert_eq!(iter.next(), None); |
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} |
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#[test] |
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fn headers_incomplete() { |
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const data: &'static [u8] = |
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b"Host: foo.com\r\n\ |
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Connection: Upgrade\r\n\ |
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Upgrade: websocket\r\n"; |
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let hdr = Headers::try_parse(data).unwrap(); |
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assert!(hdr.is_none()); |
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} |
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} |
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@ -0,0 +1,119 @@ |
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use std::io::{Cursor, Read, Write}; |
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use bytes::Buf; |
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use input_buffer::{InputBuffer, MIN_READ}; |
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use error::{Error, Result}; |
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use util::NonBlockingResult; |
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/// A generic handshake state machine.
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pub struct HandshakeMachine<Stream> { |
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stream: Stream, |
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state: HandshakeState, |
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} |
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impl<Stream> HandshakeMachine<Stream> { |
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/// Start reading data from the peer.
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pub fn start_read(stream: Stream) -> Self { |
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HandshakeMachine { |
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stream: stream, |
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state: HandshakeState::Reading(InputBuffer::with_capacity(MIN_READ)), |
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} |
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} |
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/// Start writing data to the peer.
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pub fn start_write<D: Into<Vec<u8>>>(stream: Stream, data: D) -> Self { |
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HandshakeMachine { |
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stream: stream, |
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state: HandshakeState::Writing(Cursor::new(data.into())), |
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} |
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} |
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/// Returns a shared reference to the inner stream.
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pub fn get_ref(&self) -> &Stream { |
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&self.stream |
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} |
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/// Returns a mutable reference to the inner stream.
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pub fn get_mut(&mut self) -> &mut Stream { |
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&mut self.stream |
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} |
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} |
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impl<Stream: Read + Write> HandshakeMachine<Stream> { |
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/// Perform a single handshake round.
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pub fn single_round<Obj: TryParse>(mut self) -> Result<RoundResult<Obj, Stream>> { |
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Ok(match self.state { |
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HandshakeState::Reading(mut buf) => { |
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buf.reserve(MIN_READ, usize::max_value()) // TODO limit size
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.map_err(|_| Error::Capacity("Header too long".into()))?; |
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if let Some(_) = buf.read_from(&mut self.stream).no_block()? { |
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if let Some((size, obj)) = Obj::try_parse(Buf::bytes(&buf))? { |
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buf.advance(size); |
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RoundResult::StageFinished(StageResult::DoneReading { |
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result: obj, |
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stream: self.stream, |
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tail: buf.into_vec(), |
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}) |
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} else { |
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RoundResult::Incomplete(HandshakeMachine { |
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state: HandshakeState::Reading(buf), |
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..self |
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}) |
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} |
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} else { |
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RoundResult::WouldBlock(HandshakeMachine { |
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state: HandshakeState::Reading(buf), |
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..self |
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}) |
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} |
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} |
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HandshakeState::Writing(mut buf) => { |
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if let Some(size) = self.stream.write(Buf::bytes(&buf)).no_block()? { |
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buf.advance(size); |
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if buf.has_remaining() { |
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RoundResult::Incomplete(HandshakeMachine { |
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state: HandshakeState::Writing(buf), |
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..self |
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}) |
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} else { |
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RoundResult::StageFinished(StageResult::DoneWriting(self.stream)) |
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} |
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} else { |
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RoundResult::WouldBlock(HandshakeMachine { |
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state: HandshakeState::Writing(buf), |
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..self |
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}) |
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} |
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} |
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}) |
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} |
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} |
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|
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/// The result of the round.
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pub enum RoundResult<Obj, Stream> { |
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/// Round not done, I/O would block.
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WouldBlock(HandshakeMachine<Stream>), |
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/// Round done, state unchanged.
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Incomplete(HandshakeMachine<Stream>), |
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/// Stage complete.
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StageFinished(StageResult<Obj, Stream>), |
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} |
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/// The result of the stage.
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pub enum StageResult<Obj, Stream> { |
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/// Reading round finished.
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DoneReading { result: Obj, stream: Stream, tail: Vec<u8> }, |
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/// Writing round finished.
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DoneWriting(Stream), |
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} |
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|
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/// The parseable object.
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pub trait TryParse: Sized { |
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/// Return Ok(None) if incomplete, Err on syntax error.
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fn try_parse(data: &[u8]) -> Result<Option<(usize, Self)>>; |
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} |
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|
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/// The handshake state.
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enum HandshakeState { |
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/// Reading data from the peer.
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Reading(InputBuffer), |
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/// Sending data to the peer.
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Writing(Cursor<Vec<u8>>), |
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} |
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@ -1,14 +0,0 @@ |
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use native_tls; |
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|
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use stream::Stream; |
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use super::{Handshake, HandshakeResult}; |
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|
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pub struct TlsHandshake { |
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|
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} |
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|
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impl Handshale for TlsHandshake { |
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type Stream = Stream; |
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fn handshake(self) -> Result<HandshakeResult<Self>> { |
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} |
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} |
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@ -1,8 +1,13 @@ |
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use std::net::TcpStream; |
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pub use handshake::server::ServerHandshake; |
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|
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use handshake::server::ServerHandshake; |
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use handshake::HandshakeError; |
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use protocol::WebSocket; |
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|
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use std::io::{Read, Write}; |
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|
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/// Accept the given TcpStream as a WebSocket.
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pub fn accept(stream: TcpStream) -> ServerHandshake<TcpStream> { |
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ServerHandshake::new(stream) |
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pub fn accept<Stream: Read + Write>(stream: Stream) |
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-> Result<WebSocket<Stream>, HandshakeError<Stream, ServerHandshake>> |
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{ |
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ServerHandshake::start(stream).handshake() |
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} |
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|
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