338 lines
9.2 KiB
Go
338 lines
9.2 KiB
Go
package quic
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import (
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"net"
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"strings"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/utils"
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"github.com/lucas-clemente/quic-go/logging"
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)
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type client struct {
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conn sendConn
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// If the client is created with DialAddr, we create a packet conn.
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// If it is started with Dial, we take a packet conn as a parameter.
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createdPacketConn bool
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use0RTT bool
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packetHandlers packetHandlerManager
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tlsConf *tls.Config
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config *Config
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srcConnID protocol.ConnectionID
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destConnID protocol.ConnectionID
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initialPacketNumber protocol.PacketNumber
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hasNegotiatedVersion bool
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version protocol.VersionNumber
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handshakeChan chan struct{}
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session quicSession
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tracer logging.ConnectionTracer
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tracingID uint64
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logger utils.Logger
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}
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var (
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// make it possible to mock connection ID generation in the tests
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generateConnectionID = protocol.GenerateConnectionID
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generateConnectionIDForInitial = protocol.GenerateConnectionIDForInitial
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)
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// DialAddr establishes a new QUIC connection to a server.
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// It uses a new UDP connection and closes this connection when the QUIC session is closed.
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// The hostname for SNI is taken from the given address.
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// The tls.Config.CipherSuites allows setting of TLS 1.3 cipher suites.
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func DialAddr(
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addr string,
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tlsConf *tls.Config,
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config *Config,
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) (Session, error) {
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return DialAddrContext(context.Background(), addr, tlsConf, config)
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}
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// DialAddrEarly establishes a new 0-RTT QUIC connection to a server.
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// It uses a new UDP connection and closes this connection when the QUIC session is closed.
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// The hostname for SNI is taken from the given address.
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// The tls.Config.CipherSuites allows setting of TLS 1.3 cipher suites.
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func DialAddrEarly(
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addr string,
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tlsConf *tls.Config,
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config *Config,
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) (EarlySession, error) {
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return DialAddrEarlyContext(context.Background(), addr, tlsConf, config)
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}
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// DialAddrEarlyContext establishes a new 0-RTT QUIC connection to a server using provided context.
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// See DialAddrEarly for details
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func DialAddrEarlyContext(
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ctx context.Context,
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addr string,
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tlsConf *tls.Config,
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config *Config,
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) (EarlySession, error) {
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sess, err := dialAddrContext(ctx, addr, tlsConf, config, true)
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if err != nil {
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return nil, err
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}
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utils.Logger.WithPrefix(utils.DefaultLogger, "client").Debugf("Returning early session")
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return sess, nil
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}
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// DialAddrContext establishes a new QUIC connection to a server using the provided context.
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// See DialAddr for details.
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func DialAddrContext(
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ctx context.Context,
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addr string,
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tlsConf *tls.Config,
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config *Config,
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) (Session, error) {
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return dialAddrContext(ctx, addr, tlsConf, config, false)
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}
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func dialAddrContext(
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ctx context.Context,
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addr string,
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tlsConf *tls.Config,
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config *Config,
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use0RTT bool,
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) (quicSession, error) {
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udpAddr, err := net.ResolveUDPAddr("udp", addr)
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if err != nil {
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return nil, err
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}
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
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if err != nil {
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return nil, err
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}
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return dialContext(ctx, udpConn, udpAddr, addr, tlsConf, config, use0RTT, true)
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}
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// Dial establishes a new QUIC connection to a server using a net.PacketConn. If
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// the PacketConn satisfies the OOBCapablePacketConn interface (as a net.UDPConn
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// does), ECN and packet info support will be enabled. In this case, ReadMsgUDP
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// and WriteMsgUDP will be used instead of ReadFrom and WriteTo to read/write
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// packets. The same PacketConn can be used for multiple calls to Dial and
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// Listen, QUIC connection IDs are used for demultiplexing the different
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// connections. The host parameter is used for SNI. The tls.Config must define
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// an application protocol (using NextProtos).
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func Dial(
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pconn net.PacketConn,
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remoteAddr net.Addr,
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host string,
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tlsConf *tls.Config,
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config *Config,
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) (Session, error) {
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return dialContext(context.Background(), pconn, remoteAddr, host, tlsConf, config, false, false)
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}
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// DialEarly establishes a new 0-RTT QUIC connection to a server using a net.PacketConn.
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// The same PacketConn can be used for multiple calls to Dial and Listen,
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// QUIC connection IDs are used for demultiplexing the different connections.
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// The host parameter is used for SNI.
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// The tls.Config must define an application protocol (using NextProtos).
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func DialEarly(
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pconn net.PacketConn,
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remoteAddr net.Addr,
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host string,
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tlsConf *tls.Config,
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config *Config,
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) (EarlySession, error) {
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return DialEarlyContext(context.Background(), pconn, remoteAddr, host, tlsConf, config)
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}
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// DialEarlyContext establishes a new 0-RTT QUIC connection to a server using a net.PacketConn using the provided context.
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// See DialEarly for details.
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func DialEarlyContext(
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ctx context.Context,
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pconn net.PacketConn,
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remoteAddr net.Addr,
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host string,
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tlsConf *tls.Config,
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config *Config,
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) (EarlySession, error) {
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return dialContext(ctx, pconn, remoteAddr, host, tlsConf, config, true, false)
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}
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// DialContext establishes a new QUIC connection to a server using a net.PacketConn using the provided context.
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// See Dial for details.
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func DialContext(
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ctx context.Context,
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pconn net.PacketConn,
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remoteAddr net.Addr,
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host string,
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tlsConf *tls.Config,
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config *Config,
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) (Session, error) {
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return dialContext(ctx, pconn, remoteAddr, host, tlsConf, config, false, false)
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}
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func dialContext(
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ctx context.Context,
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pconn net.PacketConn,
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remoteAddr net.Addr,
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host string,
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tlsConf *tls.Config,
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config *Config,
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use0RTT bool,
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createdPacketConn bool,
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) (quicSession, error) {
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if tlsConf == nil {
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return nil, errors.New("quic: tls.Config not set")
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}
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if err := validateConfig(config); err != nil {
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return nil, err
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}
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config = populateClientConfig(config, createdPacketConn)
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packetHandlers, err := getMultiplexer().AddConn(pconn, config.ConnectionIDLength, config.StatelessResetKey, config.Tracer)
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if err != nil {
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return nil, err
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}
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c, err := newClient(pconn, remoteAddr, config, tlsConf, host, use0RTT, createdPacketConn)
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if err != nil {
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return nil, err
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}
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c.packetHandlers = packetHandlers
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c.tracingID = nextSessionTracingID()
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if c.config.Tracer != nil {
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c.tracer = c.config.Tracer.TracerForConnection(
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context.WithValue(ctx, SessionTracingKey, c.tracingID),
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protocol.PerspectiveClient,
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c.destConnID,
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)
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}
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if c.tracer != nil {
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c.tracer.StartedConnection(c.conn.LocalAddr(), c.conn.RemoteAddr(), c.srcConnID, c.destConnID)
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}
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if err := c.dial(ctx); err != nil {
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return nil, err
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}
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return c.session, nil
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}
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func newClient(
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pconn net.PacketConn,
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remoteAddr net.Addr,
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config *Config,
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tlsConf *tls.Config,
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host string,
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use0RTT bool,
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createdPacketConn bool,
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) (*client, error) {
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if tlsConf == nil {
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tlsConf = &tls.Config{}
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}
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if tlsConf.ServerName == "" {
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sni := host
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if strings.IndexByte(sni, ':') != -1 {
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var err error
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sni, _, err = net.SplitHostPort(sni)
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if err != nil {
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return nil, err
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}
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}
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tlsConf.ServerName = sni
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}
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// check that all versions are actually supported
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if config != nil {
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for _, v := range config.Versions {
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if !protocol.IsValidVersion(v) {
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return nil, fmt.Errorf("%s is not a valid QUIC version", v)
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}
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}
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}
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srcConnID, err := generateConnectionID(config.ConnectionIDLength)
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if err != nil {
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return nil, err
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}
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destConnID, err := generateConnectionIDForInitial()
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if err != nil {
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return nil, err
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}
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c := &client{
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srcConnID: srcConnID,
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destConnID: destConnID,
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conn: newSendPconn(pconn, remoteAddr),
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createdPacketConn: createdPacketConn,
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use0RTT: use0RTT,
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tlsConf: tlsConf,
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config: config,
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version: config.Versions[0],
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handshakeChan: make(chan struct{}),
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logger: utils.DefaultLogger.WithPrefix("client"),
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}
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return c, nil
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}
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func (c *client) dial(ctx context.Context) error {
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c.logger.Infof("Starting new connection to %s (%s -> %s), source connection ID %s, destination connection ID %s, version %s", c.tlsConf.ServerName, c.conn.LocalAddr(), c.conn.RemoteAddr(), c.srcConnID, c.destConnID, c.version)
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c.session = newClientSession(
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c.conn,
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c.packetHandlers,
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c.destConnID,
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c.srcConnID,
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c.config,
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c.tlsConf,
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c.initialPacketNumber,
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c.use0RTT,
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c.hasNegotiatedVersion,
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c.tracer,
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c.tracingID,
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c.logger,
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c.version,
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)
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c.packetHandlers.Add(c.srcConnID, c.session)
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errorChan := make(chan error, 1)
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go func() {
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err := c.session.run() // returns as soon as the session is closed
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if e := (&errCloseForRecreating{}); !errors.As(err, &e) && c.createdPacketConn {
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c.packetHandlers.Destroy()
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}
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errorChan <- err
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}()
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// only set when we're using 0-RTT
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// Otherwise, earlySessionChan will be nil. Receiving from a nil chan blocks forever.
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var earlySessionChan <-chan struct{}
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if c.use0RTT {
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earlySessionChan = c.session.earlySessionReady()
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}
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select {
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case <-ctx.Done():
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c.session.shutdown()
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return ctx.Err()
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case err := <-errorChan:
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var recreateErr *errCloseForRecreating
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if errors.As(err, &recreateErr) {
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c.initialPacketNumber = recreateErr.nextPacketNumber
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c.version = recreateErr.nextVersion
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c.hasNegotiatedVersion = true
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return c.dial(ctx)
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}
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return err
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case <-earlySessionChan:
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// ready to send 0-RTT data
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return nil
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case <-c.session.HandshakeComplete().Done():
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// handshake successfully completed
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return nil
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}
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}
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