route/vendor/github.com/lucas-clemente/quic-go/client.go

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package quic
import (
"bytes"
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"crypto/tls"
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"errors"
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"fmt"
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"net"
"strings"
"sync"
"time"
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"github.com/lucas-clemente/quic-go/internal/handshake"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/utils"
"github.com/lucas-clemente/quic-go/internal/wire"
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"github.com/lucas-clemente/quic-go/qerr"
)
type client struct {
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mutex sync.Mutex
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conn connection
hostname string
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versionNegotiationChan chan struct{} // the versionNegotiationChan is closed as soon as the server accepted the suggested version
versionNegotiated bool // has the server accepted our version
receivedVersionNegotiationPacket bool
negotiatedVersions []protocol.VersionNumber // the list of versions from the version negotiation packet
tlsConf *tls.Config
config *Config
tls handshake.MintTLS // only used when using TLS
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connectionID protocol.ConnectionID
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initialVersion protocol.VersionNumber
version protocol.VersionNumber
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session packetHandler
}
var (
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// make it possible to mock connection ID generation in the tests
generateConnectionID = utils.GenerateConnectionID
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errCloseSessionForNewVersion = errors.New("closing session in order to recreate it with a new version")
)
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// DialAddr establishes a new QUIC connection to a server.
// The hostname for SNI is taken from the given address.
func DialAddr(addr string, tlsConf *tls.Config, config *Config) (Session, error) {
udpAddr, err := net.ResolveUDPAddr("udp", addr)
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if err != nil {
return nil, err
}
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
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if err != nil {
return nil, err
}
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return Dial(udpConn, udpAddr, addr, tlsConf, config)
}
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// DialAddrNonFWSecure establishes a new QUIC connection to a server.
// The hostname for SNI is taken from the given address.
func DialAddrNonFWSecure(
addr string,
tlsConf *tls.Config,
config *Config,
) (NonFWSession, error) {
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
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}
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
if err != nil {
return nil, err
}
return DialNonFWSecure(udpConn, udpAddr, addr, tlsConf, config)
}
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// DialNonFWSecure establishes a new non-forward-secure QUIC connection to a server using a net.PacketConn.
// The host parameter is used for SNI.
func DialNonFWSecure(
pconn net.PacketConn,
remoteAddr net.Addr,
host string,
tlsConf *tls.Config,
config *Config,
) (NonFWSession, error) {
connID, err := generateConnectionID()
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if err != nil {
return nil, err
}
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var hostname string
if tlsConf != nil {
hostname = tlsConf.ServerName
}
if hostname == "" {
hostname, _, err = net.SplitHostPort(host)
if err != nil {
return nil, err
}
}
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clientConfig := populateClientConfig(config)
c := &client{
conn: &conn{pconn: pconn, currentAddr: remoteAddr},
connectionID: connID,
hostname: hostname,
tlsConf: tlsConf,
config: clientConfig,
version: clientConfig.Versions[0],
versionNegotiationChan: make(chan struct{}),
}
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utils.Infof("Starting new connection to %s (%s -> %s), connectionID %x, version %s", hostname, c.conn.LocalAddr().String(), c.conn.RemoteAddr().String(), c.connectionID, c.version)
go c.listen()
if err := c.dial(); err != nil {
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return nil, err
}
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return c.session.(NonFWSession), nil
}
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// Dial establishes a new QUIC connection to a server using a net.PacketConn.
// The host parameter is used for SNI.
func Dial(
pconn net.PacketConn,
remoteAddr net.Addr,
host string,
tlsConf *tls.Config,
config *Config,
) (Session, error) {
sess, err := DialNonFWSecure(pconn, remoteAddr, host, tlsConf, config)
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if err != nil {
return nil, err
}
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if err := sess.WaitUntilHandshakeComplete(); err != nil {
return nil, err
}
return sess, nil
}
// populateClientConfig populates fields in the quic.Config with their default values, if none are set
// it may be called with nil
func populateClientConfig(config *Config) *Config {
if config == nil {
config = &Config{}
}
versions := config.Versions
if len(versions) == 0 {
versions = protocol.SupportedVersions
}
handshakeTimeout := protocol.DefaultHandshakeTimeout
if config.HandshakeTimeout != 0 {
handshakeTimeout = config.HandshakeTimeout
}
idleTimeout := protocol.DefaultIdleTimeout
if config.IdleTimeout != 0 {
idleTimeout = config.IdleTimeout
}
maxReceiveStreamFlowControlWindow := config.MaxReceiveStreamFlowControlWindow
if maxReceiveStreamFlowControlWindow == 0 {
maxReceiveStreamFlowControlWindow = protocol.DefaultMaxReceiveStreamFlowControlWindowClient
}
maxReceiveConnectionFlowControlWindow := config.MaxReceiveConnectionFlowControlWindow
if maxReceiveConnectionFlowControlWindow == 0 {
maxReceiveConnectionFlowControlWindow = protocol.DefaultMaxReceiveConnectionFlowControlWindowClient
}
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return &Config{
Versions: versions,
HandshakeTimeout: handshakeTimeout,
IdleTimeout: idleTimeout,
RequestConnectionIDOmission: config.RequestConnectionIDOmission,
MaxReceiveStreamFlowControlWindow: maxReceiveStreamFlowControlWindow,
MaxReceiveConnectionFlowControlWindow: maxReceiveConnectionFlowControlWindow,
KeepAlive: config.KeepAlive,
}
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}
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func (c *client) dial() error {
var err error
if c.version.UsesTLS() {
err = c.dialTLS()
} else {
err = c.dialGQUIC()
}
if err == errCloseSessionForNewVersion {
return c.dial()
}
return err
}
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func (c *client) dialGQUIC() error {
if err := c.createNewGQUICSession(); err != nil {
return err
}
return c.establishSecureConnection()
}
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func (c *client) dialTLS() error {
csc := handshake.NewCryptoStreamConn(nil)
mintConf, err := tlsToMintConfig(c.tlsConf, protocol.PerspectiveClient)
if err != nil {
return err
}
mintConf.ServerName = c.hostname
c.tls = newMintController(csc, mintConf, protocol.PerspectiveClient)
params := &handshake.TransportParameters{
StreamFlowControlWindow: protocol.ReceiveStreamFlowControlWindow,
ConnectionFlowControlWindow: protocol.ReceiveConnectionFlowControlWindow,
MaxStreams: protocol.MaxIncomingStreams,
IdleTimeout: c.config.IdleTimeout,
OmitConnectionID: c.config.RequestConnectionIDOmission,
}
eh := handshake.NewExtensionHandlerClient(params, c.initialVersion, c.config.Versions, c.version)
if err := c.tls.SetExtensionHandler(eh); err != nil {
return err
}
if err := c.createNewTLSSession(eh.GetPeerParams(), c.version); err != nil {
return err
}
if err := c.establishSecureConnection(); err != nil {
if err != handshake.ErrCloseSessionForRetry {
return err
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}
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utils.Infof("Received a Retry packet. Recreating session.")
if err := c.createNewTLSSession(eh.GetPeerParams(), c.version); err != nil {
return err
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}
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if err := c.establishSecureConnection(); err != nil {
return err
}
}
return nil
}
// establishSecureConnection runs the session, and tries to establish a secure connection
// It returns:
// - errCloseSessionForNewVersion when the server sends a version negotiation packet
// - handshake.ErrCloseSessionForRetry when the server performs a stateless retry (for IETF QUIC)
// - any other error that might occur
// - when the connection is secure (for gQUIC), or forward-secure (for IETF QUIC)
func (c *client) establishSecureConnection() error {
var runErr error
errorChan := make(chan struct{})
go func() {
runErr = c.session.run() // returns as soon as the session is closed
close(errorChan)
utils.Infof("Connection %x closed.", c.connectionID)
if runErr != handshake.ErrCloseSessionForRetry && runErr != errCloseSessionForNewVersion {
c.conn.Close()
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}
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}()
// wait until the server accepts the QUIC version (or an error occurs)
select {
case <-errorChan:
return runErr
case <-c.versionNegotiationChan:
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}
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select {
case <-errorChan:
return runErr
case ev := <-c.session.handshakeStatus():
if ev.err != nil {
return ev.err
}
if !c.version.UsesTLS() && ev.encLevel != protocol.EncryptionSecure {
return fmt.Errorf("Client BUG: Expected encryption level to be secure, was %s", ev.encLevel)
}
return nil
}
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}
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// Listen listens on the underlying connection and passes packets on for handling.
// It returns when the connection is closed.
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func (c *client) listen() {
var err error
for {
var n int
var addr net.Addr
data := getPacketBuffer()
data = data[:protocol.MaxReceivePacketSize]
// The packet size should not exceed protocol.MaxReceivePacketSize bytes
// If it does, we only read a truncated packet, which will then end up undecryptable
n, addr, err = c.conn.Read(data)
if err != nil {
if !strings.HasSuffix(err.Error(), "use of closed network connection") {
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c.mutex.Lock()
if c.session != nil {
c.session.Close(err)
}
c.mutex.Unlock()
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}
break
}
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c.handlePacket(addr, data[:n])
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}
}
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func (c *client) handlePacket(remoteAddr net.Addr, packet []byte) {
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rcvTime := time.Now()
r := bytes.NewReader(packet)
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hdr, err := wire.ParseHeaderSentByServer(r, c.version)
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if err != nil {
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utils.Errorf("error parsing packet from %s: %s", remoteAddr.String(), err.Error())
// drop this packet if we can't parse the header
return
}
// reject packets with truncated connection id if we didn't request truncation
if hdr.OmitConnectionID && !c.config.RequestConnectionIDOmission {
return
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}
hdr.Raw = packet[:len(packet)-r.Len()]
c.mutex.Lock()
defer c.mutex.Unlock()
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// reject packets with the wrong connection ID
if !hdr.OmitConnectionID && hdr.ConnectionID != c.connectionID {
return
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}
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if hdr.ResetFlag {
cr := c.conn.RemoteAddr()
// check if the remote address and the connection ID match
// otherwise this might be an attacker trying to inject a PUBLIC_RESET to kill the connection
if cr.Network() != remoteAddr.Network() || cr.String() != remoteAddr.String() || hdr.ConnectionID != c.connectionID {
utils.Infof("Received a spoofed Public Reset. Ignoring.")
return
}
pr, err := wire.ParsePublicReset(r)
if err != nil {
utils.Infof("Received a Public Reset. An error occurred parsing the packet: %s", err)
return
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}
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utils.Infof("Received Public Reset, rejected packet number: %#x.", pr.RejectedPacketNumber)
c.session.closeRemote(qerr.Error(qerr.PublicReset, fmt.Sprintf("Received a Public Reset for packet number %#x", pr.RejectedPacketNumber)))
return
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}
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// handle Version Negotiation Packets
if hdr.IsVersionNegotiation {
// ignore delayed / duplicated version negotiation packets
if c.receivedVersionNegotiationPacket || c.versionNegotiated {
return
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}
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// version negotiation packets have no payload
if err := c.handleVersionNegotiationPacket(hdr); err != nil {
c.session.Close(err)
}
return
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}
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// this is the first packet we are receiving
// since it is not a Version Negotiation Packet, this means the server supports the suggested version
if !c.versionNegotiated {
c.versionNegotiated = true
close(c.versionNegotiationChan)
}
// TODO: validate packet number and connection ID on Retry packets (for IETF QUIC)
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c.session.handlePacket(&receivedPacket{
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remoteAddr: remoteAddr,
header: hdr,
data: packet[len(packet)-r.Len():],
rcvTime: rcvTime,
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})
}
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func (c *client) handleVersionNegotiationPacket(hdr *wire.Header) error {
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for _, v := range hdr.SupportedVersions {
if v == c.version {
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// the version negotiation packet contains the version that we offered
// this might be a packet sent by an attacker (or by a terribly broken server implementation)
// ignore it
return nil
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}
}
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newVersion, ok := protocol.ChooseSupportedVersion(c.config.Versions, hdr.SupportedVersions)
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if !ok {
return qerr.InvalidVersion
}
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c.receivedVersionNegotiationPacket = true
c.negotiatedVersions = hdr.SupportedVersions
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// switch to negotiated version
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c.initialVersion = c.version
c.version = newVersion
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var err error
c.connectionID, err = utils.GenerateConnectionID()
if err != nil {
return err
}
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utils.Infof("Switching to QUIC version %s. New connection ID: %x", newVersion, c.connectionID)
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c.session.Close(errCloseSessionForNewVersion)
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return nil
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}
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func (c *client) createNewGQUICSession() (err error) {
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c.mutex.Lock()
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defer c.mutex.Unlock()
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c.session, err = newClientSession(
c.conn,
c.hostname,
c.version,
c.connectionID,
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c.tlsConf,
c.config,
c.initialVersion,
c.negotiatedVersions,
)
return err
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}
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func (c *client) createNewTLSSession(
paramsChan <-chan handshake.TransportParameters,
version protocol.VersionNumber,
) (err error) {
c.mutex.Lock()
defer c.mutex.Unlock()
c.session, err = newTLSClientSession(
c.conn,
c.hostname,
c.version,
c.connectionID,
c.config,
c.tls,
paramsChan,
1,
)
return err
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}