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/
transport.go
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/
transport.go
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package libp2pquic
import (
"context"
"errors"
"fmt"
"io"
"net"
"github.com/libp2p/go-libp2p-core/connmgr"
n "github.com/libp2p/go-libp2p-core/network"
"github.com/minio/sha256-simd"
"golang.org/x/crypto/hkdf"
logging "github.com/ipfs/go-log"
ic "github.com/libp2p/go-libp2p-core/crypto"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/libp2p/go-libp2p-core/pnet"
tpt "github.com/libp2p/go-libp2p-core/transport"
p2ptls "github.com/libp2p/go-libp2p-tls"
quic "github.com/lucas-clemente/quic-go"
ma "github.com/multiformats/go-multiaddr"
mafmt "github.com/multiformats/go-multiaddr-fmt"
manet "github.com/multiformats/go-multiaddr/net"
)
var log = logging.Logger("quic-transport")
var quicDialContext = quic.DialContext // so we can mock it in tests
var quicConfig = &quic.Config{
MaxIncomingStreams: 1000,
MaxIncomingUniStreams: -1, // disable unidirectional streams
MaxStreamReceiveWindow: 10 * (1 << 20), // 10 MB
MaxConnectionReceiveWindow: 15 * (1 << 20), // 15 MB
AcceptToken: func(clientAddr net.Addr, _ *quic.Token) bool {
// TODO(#6): require source address validation when under load
return true
},
KeepAlive: true,
Versions: []quic.VersionNumber{quic.VersionDraft29},
}
const statelessResetKeyInfo = "libp2p quic stateless reset key"
const errorCodeConnectionGating = 0x47415445 // GATE in ASCII
type connManager struct {
reuseUDP4 *reuse
reuseUDP6 *reuse
}
func newConnManager(gater connmgr.ConnectionGater) (*connManager, error) {
reuseUDP4 := newReuse(gater)
reuseUDP6 := newReuse(gater)
return &connManager{
reuseUDP4: reuseUDP4,
reuseUDP6: reuseUDP6,
}, nil
}
func (c *connManager) getReuse(network string) (*reuse, error) {
switch network {
case "udp4":
return c.reuseUDP4, nil
case "udp6":
return c.reuseUDP6, nil
default:
return nil, errors.New("invalid network: must be either udp4 or udp6")
}
}
func (c *connManager) Listen(network string, laddr *net.UDPAddr) (*reuseConn, error) {
reuse, err := c.getReuse(network)
if err != nil {
return nil, err
}
return reuse.Listen(network, laddr)
}
func (c *connManager) Dial(network string, raddr *net.UDPAddr) (*reuseConn, error) {
reuse, err := c.getReuse(network)
if err != nil {
return nil, err
}
return reuse.Dial(network, raddr)
}
// The Transport implements the tpt.Transport interface for QUIC connections.
type transport struct {
privKey ic.PrivKey
localPeer peer.ID
identity *p2ptls.Identity
connManager *connManager
serverConfig *quic.Config
clientConfig *quic.Config
gater connmgr.ConnectionGater
}
var _ tpt.Transport = &transport{}
// NewTransport creates a new QUIC transport
func NewTransport(key ic.PrivKey, psk pnet.PSK, gater connmgr.ConnectionGater) (tpt.Transport, error) {
if len(psk) > 0 {
log.Error("QUIC doesn't support private networks yet.")
return nil, errors.New("QUIC doesn't support private networks yet")
}
localPeer, err := peer.IDFromPrivateKey(key)
if err != nil {
return nil, err
}
identity, err := p2ptls.NewIdentity(key)
if err != nil {
return nil, err
}
connManager, err := newConnManager(gater)
if err != nil {
return nil, err
}
config := quicConfig.Clone()
keyBytes, err := key.Raw()
if err != nil {
return nil, err
}
keyReader := hkdf.New(sha256.New, keyBytes, nil, []byte(statelessResetKeyInfo))
config.StatelessResetKey = make([]byte, 32)
if _, err := io.ReadFull(keyReader, config.StatelessResetKey); err != nil {
return nil, err
}
config.Tracer = tracer
return &transport{
privKey: key,
localPeer: localPeer,
identity: identity,
connManager: connManager,
serverConfig: config,
clientConfig: config.Clone(),
gater: gater,
}, nil
}
// Dial dials a new QUIC connection
func (t *transport) Dial(ctx context.Context, raddr ma.Multiaddr, p peer.ID) (tpt.CapableConn, error) {
network, host, err := manet.DialArgs(raddr)
if err != nil {
return nil, err
}
addr, err := net.ResolveUDPAddr(network, host)
if err != nil {
return nil, err
}
remoteMultiaddr, err := toQuicMultiaddr(addr)
if err != nil {
return nil, err
}
tlsConf, keyCh := t.identity.ConfigForPeer(p)
pconn, err := t.connManager.Dial(network, addr)
if err != nil {
return nil, err
}
sess, err := quicDialContext(ctx, pconn, addr, host, tlsConf, t.clientConfig)
if err != nil {
pconn.DecreaseCount()
return nil, err
}
// Should be ready by this point, don't block.
var remotePubKey ic.PubKey
select {
case remotePubKey = <-keyCh:
default:
}
if remotePubKey == nil {
pconn.DecreaseCount()
return nil, errors.New("go-libp2p-quic-transport BUG: expected remote pub key to be set")
}
go func() {
<-sess.Context().Done()
pconn.DecreaseCount()
}()
localMultiaddr, err := toQuicMultiaddr(pconn.LocalAddr())
if err != nil {
sess.CloseWithError(0, "")
return nil, err
}
conn := &conn{
sess: sess,
transport: t,
privKey: t.privKey,
localPeer: t.localPeer,
localMultiaddr: localMultiaddr,
remotePubKey: remotePubKey,
remotePeerID: p,
remoteMultiaddr: remoteMultiaddr,
}
if t.gater != nil && !t.gater.InterceptSecured(n.DirOutbound, p, conn) {
sess.CloseWithError(errorCodeConnectionGating, "connection gated")
return nil, fmt.Errorf("secured connection gated")
}
return conn, nil
}
// Don't use mafmt.QUIC as we don't want to dial DNS addresses. Just /ip{4,6}/udp/quic
var dialMatcher = mafmt.And(mafmt.IP, mafmt.Base(ma.P_UDP), mafmt.Base(ma.P_QUIC))
// CanDial determines if we can dial to an address
func (t *transport) CanDial(addr ma.Multiaddr) bool {
return dialMatcher.Matches(addr)
}
// Listen listens for new QUIC connections on the passed multiaddr.
func (t *transport) Listen(addr ma.Multiaddr) (tpt.Listener, error) {
lnet, host, err := manet.DialArgs(addr)
if err != nil {
return nil, err
}
laddr, err := net.ResolveUDPAddr(lnet, host)
if err != nil {
return nil, err
}
conn, err := t.connManager.Listen(lnet, laddr)
if err != nil {
return nil, err
}
ln, err := newListener(conn, t, t.localPeer, t.privKey, t.identity)
if err != nil {
conn.DecreaseCount()
return nil, err
}
return ln, nil
}
// Proxy returns true if this transport proxies.
func (t *transport) Proxy() bool {
return false
}
// Protocols returns the set of protocols handled by this transport.
func (t *transport) Protocols() []int {
return []int{ma.P_QUIC}
}
func (t *transport) String() string {
return "QUIC"
}