gquic

README

A QUIC implementation in pure Go

quic-go is an implementation of the QUIC protocol in Go.

Roadmap

quic-go is compatible with the current version(s) of Google Chrome and QUIC as deployed on Google's servers. We're actively tracking the development of the Chrome code to ensure compatibility as the protocol evolves. In that process, we're dropping support for old QUIC versions. As Google's QUIC versions are expected to converge towards the IETF QUIC draft, quic-go will eventually implement that draft.

Guides

We currently support Go 1.9+.

Installing and updating dependencies:

go get -t -u ./...

Running tests:

go test ./...

Running the example server

go run example/main.go -www /var/www/

Using the quic_client from chromium:

quic_client --host=127.0.0.1 --port=6121 --v=1 https://quic.clemente.io

Using Chrome:

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --user-data-dir=/tmp/chrome --no-proxy-server --enable-quic --origin-to-force-quic-on=quic.clemente.io:443 --host-resolver-rules='MAP quic.clemente.io:443 127.0.0.1:6121' https://quic.clemente.io

QUIC without HTTP/2

Take a look at this echo example.

Using the example client

go run example/client/main.go https://clemente.io

Usage

As a server

See the example server or try out Caddy (from version 0.9, instructions here). Starting a QUIC server is very similar to the standard lib http in go:

http.Handle("/", http.FileServer(http.Dir(wwwDir)))
h2quic.ListenAndServeQUIC("localhost:4242", "/path/to/cert/chain.pem", "/path/to/privkey.pem", nil)

As a client

See the example client. Use a h2quic.RoundTripper as a Transport in a http.Client.

http.Client{
  Transport: &h2quic.RoundTripper{},
}

Contributing

We are always happy to welcome new contributors! We have a number of self-contained issues that are suitable for first-time contributors, they are tagged with help wanted. If you have any questions, please feel free to reach out by opening an issue or leaving a comment.

Documentation

Index

• Constants
• type Config
• type ConnectionState
• type Cookie
• type ErrorCode
• type Listener
  • func Listen(conn net.PacketConn, tlsConf *tls.Config, config *Config) (Listener, error)
  • func ListenAddr(addr string, tlsConf *tls.Config, config *Config) (Listener, error)
• type ReceiveStream
• type SendStream
• type Session
  • func Dial(pconn net.PacketConn, remoteAddr net.Addr, host string, tlsConf *tls.Config, ...) (Session, error)
  • func DialAddr(addr string, tlsConf *tls.Config, config *Config) (Session, error)
  • func DialAddrContext(ctx context.Context, addr string, tlsConf *tls.Config, config *Config) (Session, error)
  • func DialContext(ctx context.Context, pconn net.PacketConn, remoteAddr net.Addr, host string, ...) (Session, error)
• type Stream
• type StreamError
• type StreamID
• type VersionNumber

Constants

const (
	// VersionGQUIC39 is gQUIC version 39.
	VersionGQUIC39 = protocol.Version39
	// VersionGQUIC43 is gQUIC version 43.
	VersionGQUIC43 = protocol.Version43
	// VersionGQUIC44 is gQUIC version 44.
	VersionGQUIC44 = protocol.Version44
)

Types

type Config

type Config struct {
	// The QUIC versions that can be negotiated.
	// If not set, it uses all versions available.
	// Warning: This API should not be considered stable and will change soon.
	Versions []VersionNumber
	// Ask the server to omit the connection ID sent in the Public Header.
	// This saves 8 bytes in the Public Header in every packet. However, if the IP address of the server changes, the connection cannot be migrated.
	// Currently only valid for the client.
	RequestConnectionIDOmission bool
	// The length of the connection ID in bytes. Only valid for IETF QUIC.
	// It can be 0, or any value between 4 and 18.
	// If not set, the interpretation depends on where the Config is used:
	// If used for dialing an address, a 0 byte connection ID will be used.
	// If used for a server, or dialing on a packet conn, a 4 byte connection ID will be used.
	// When dialing on a packet conn, the ConnectionIDLength value must be the same for every Dial call.
	ConnectionIDLength int
	// HandshakeTimeout is the maximum duration that the cryptographic handshake may take.
	// If the timeout is exceeded, the connection is closed.
	// If this value is zero, the timeout is set to 10 seconds.
	HandshakeTimeout time.Duration
	// IdleTimeout is the maximum duration that may pass without any incoming network activity.
	// This value only applies after the handshake has completed.
	// If the timeout is exceeded, the connection is closed.
	// If this value is zero, the timeout is set to 30 seconds.
	IdleTimeout time.Duration
	// AcceptCookie determines if a Cookie is accepted.
	// It is called with cookie = nil if the client didn't send an Cookie.
	// If not set, it verifies that the address matches, and that the Cookie was issued within the last 24 hours.
	// This option is only valid for the server.
	AcceptCookie func(clientAddr net.Addr, cookie *Cookie) bool
	// MaxReceiveStreamFlowControlWindow is the maximum stream-level flow control window for receiving data.
	// If this value is zero, it will default to 1 MB for the server and 6 MB for the client.
	MaxReceiveStreamFlowControlWindow uint64
	// MaxReceiveConnectionFlowControlWindow is the connection-level flow control window for receiving data.
	// If this value is zero, it will default to 1.5 MB for the server and 15 MB for the client.
	MaxReceiveConnectionFlowControlWindow uint64
	// MaxIncomingStreams is the maximum number of concurrent bidirectional streams that a peer is allowed to open.
	// If not set, it will default to 100.
	// If set to a negative value, it doesn't allow any bidirectional streams.
	// Values larger than 65535 (math.MaxUint16) are invalid.
	MaxIncomingStreams int
	// MaxIncomingUniStreams is the maximum number of concurrent unidirectional streams that a peer is allowed to open.
	// This value doesn't have any effect in Google QUIC.
	// If not set, it will default to 100.
	// If set to a negative value, it doesn't allow any unidirectional streams.
	// Values larger than 65535 (math.MaxUint16) are invalid.
	MaxIncomingUniStreams int
	// KeepAlive defines whether this peer will periodically send PING frames to keep the connection alive.
	KeepAlive bool
}

Config contains all configuration data needed for a QUIC server or client.

type ConnectionState

type ConnectionState = handshake.ConnectionState

ConnectionState records basic details about the QUIC connection.

type Cookie

type Cookie = handshake.Cookie

A Cookie can be used to verify the ownership of the client address.

type ErrorCode

type ErrorCode = protocol.ApplicationErrorCode

An ErrorCode is an application-defined error code.

type Listener

type Listener interface {
	// Close the server, sending CONNECTION_CLOSE frames to each peer.
	Close() error
	// Addr returns the local network addr that the server is listening on.
	Addr() net.Addr
	// Accept returns new sessions. It should be called in a loop.
	Accept() (Session, error)
}

A Listener for incoming QUIC connections

func Listen

func Listen(conn net.PacketConn, tlsConf *tls.Config, config *Config) (Listener, error)

Listen listens for QUIC connections on a given net.PacketConn. The tls.Config must not be nil, the quic.Config may be nil.

func ListenAddr

func ListenAddr(addr string, tlsConf *tls.Config, config *Config) (Listener, error)

ListenAddr creates a QUIC server listening on a given address. The tls.Config must not be nil, the quic.Config may be nil.

type ReceiveStream

type ReceiveStream interface {
	// see Stream.StreamID
	StreamID() StreamID
	// see Stream.Read
	io.Reader
	// see Stream.CancelRead
	CancelRead(ErrorCode) error
	// see Stream.SetReadDealine
	SetReadDeadline(t time.Time) error
}

A ReceiveStream is a unidirectional Receive Stream.

type SendStream

type SendStream interface {
	// see Stream.StreamID
	StreamID() StreamID
	// see Stream.Write
	io.Writer
	// see Stream.Close
	io.Closer
	// see Stream.CancelWrite
	CancelWrite(ErrorCode) error
	// see Stream.Context
	Context() context.Context
	// see Stream.SetWriteDeadline
	SetWriteDeadline(t time.Time) error
}

A SendStream is a unidirectional Send Stream.

type Session

type Session interface {
	// AcceptStream returns the next stream opened by the peer, blocking until one is available.
	AcceptStream() (Stream, error)
	// AcceptUniStream returns the next unidirectional stream opened by the peer, blocking until one is available.
	AcceptUniStream() (ReceiveStream, error)
	// OpenStream opens a new bidirectional QUIC stream.
	// It returns a special error when the peer's concurrent stream limit is reached.
	// There is no signaling to the peer about new streams:
	// The peer can only accept the stream after data has been sent on the stream.
	// TODO(#1152): Enable testing for the special error
	OpenStream() (Stream, error)
	// OpenStreamSync opens a new bidirectional QUIC stream.
	// It blocks until the peer's concurrent stream limit allows a new stream to be opened.
	OpenStreamSync() (Stream, error)
	// OpenUniStream opens a new outgoing unidirectional QUIC stream.
	// It returns a special error when the peer's concurrent stream limit is reached.
	// TODO(#1152): Enable testing for the special error
	OpenUniStream() (SendStream, error)
	// OpenUniStreamSync opens a new outgoing unidirectional QUIC stream.
	// It blocks until the peer's concurrent stream limit allows a new stream to be opened.
	OpenUniStreamSync() (SendStream, error)
	// LocalAddr returns the local address.
	LocalAddr() net.Addr
	// RemoteAddr returns the address of the peer.
	RemoteAddr() net.Addr
	// Close the connection.
	io.Closer
	// Close the connection with an error.
	// The error must not be nil.
	CloseWithError(ErrorCode, error) error
	// The context is cancelled when the session is closed.
	// Warning: This API should not be considered stable and might change soon.
	Context() context.Context
	// ConnectionState returns basic details about the QUIC connection.
	// Warning: This API should not be considered stable and might change soon.
	ConnectionState() ConnectionState
}

A Session is a QUIC connection between two peers.

func Dial

func Dial(
	pconn net.PacketConn,
	remoteAddr net.Addr,
	host string,
	tlsConf *tls.Config,
	config *Config,
) (Session, error)

Dial establishes a new QUIC connection to a server using a net.PacketConn. The host parameter is used for SNI.

func DialAddr

func DialAddr(
	addr string,
	tlsConf *tls.Config,
	config *Config,
) (Session, error)

DialAddr establishes a new QUIC connection to a server. The hostname for SNI is taken from the given address.

func DialAddrContext

func DialAddrContext(
	ctx context.Context,
	addr string,
	tlsConf *tls.Config,
	config *Config,
) (Session, error)

DialAddrContext establishes a new QUIC connection to a server using the provided context. The hostname for SNI is taken from the given address.

func DialContext

func DialContext(
	ctx context.Context,
	pconn net.PacketConn,
	remoteAddr net.Addr,
	host string,
	tlsConf *tls.Config,
	config *Config,
) (Session, error)

DialContext establishes a new QUIC connection to a server using a net.PacketConn using the provided context. The host parameter is used for SNI.

type Stream

type Stream interface {
	// StreamID returns the stream ID.
	StreamID() StreamID
	// Read reads data from the stream.
	// Read can be made to time out and return a net.Error with Timeout() == true
	// after a fixed time limit; see SetDeadline and SetReadDeadline.
	// If the stream was canceled by the peer, the error implements the StreamError
	// interface, and Canceled() == true.
	io.Reader
	// Write writes data to the stream.
	// Write can be made to time out and return a net.Error with Timeout() == true
	// after a fixed time limit; see SetDeadline and SetWriteDeadline.
	// If the stream was canceled by the peer, the error implements the StreamError
	// interface, and Canceled() == true.
	io.Writer
	// Close closes the write-direction of the stream.
	// Future calls to Write are not permitted after calling Close.
	// It must not be called concurrently with Write.
	// It must not be called after calling CancelWrite.
	io.Closer
	// CancelWrite aborts sending on this stream.
	// It must not be called after Close.
	// Data already written, but not yet delivered to the peer is not guaranteed to be delivered reliably.
	// Write will unblock immediately, and future calls to Write will fail.
	CancelWrite(ErrorCode) error
	// CancelRead aborts receiving on this stream.
	// It will ask the peer to stop transmitting stream data.
	// Read will unblock immediately, and future Read calls will fail.
	CancelRead(ErrorCode) error
	// The context is canceled as soon as the write-side of the stream is closed.
	// This happens when Close() is called, or when the stream is reset (either locally or remotely).
	// Warning: This API should not be considered stable and might change soon.
	Context() context.Context
	// SetReadDeadline sets the deadline for future Read calls and
	// any currently-blocked Read call.
	// A zero value for t means Read will not time out.
	SetReadDeadline(t time.Time) error
	// SetWriteDeadline sets the deadline for future Write calls
	// and any currently-blocked Write call.
	// Even if write times out, it may return n > 0, indicating that
	// some of the data was successfully written.
	// A zero value for t means Write will not time out.
	SetWriteDeadline(t time.Time) error
	// SetDeadline sets the read and write deadlines associated
	// with the connection. It is equivalent to calling both
	// SetReadDeadline and SetWriteDeadline.
	SetDeadline(t time.Time) error
}

Stream is the interface implemented by QUIC streams

type StreamError

type StreamError interface {
	error
	Canceled() bool
	ErrorCode() ErrorCode
}

StreamError is returned by Read and Write when the peer cancels the stream.

type StreamID

type StreamID = protocol.StreamID

The StreamID is the ID of a QUIC stream.

type VersionNumber

type VersionNumber = protocol.VersionNumber

A VersionNumber is a QUIC version number.